1 #include "ceph_debug.h"
4 #include <linux/highmem.h>
6 #include <linux/pagemap.h>
7 #include <linux/slab.h>
8 #include <linux/uaccess.h>
11 #include "osd_client.h"
12 #include "messenger.h"
16 const static struct ceph_connection_operations osd_con_ops;
18 static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
21 * Implement client access to distributed object storage cluster.
23 * All data objects are stored within a cluster/cloud of OSDs, or
24 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
25 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
26 * remote daemons serving up and coordinating consistent and safe
29 * Cluster membership and the mapping of data objects onto storage devices
30 * are described by the osd map.
32 * We keep track of pending OSD requests (read, write), resubmit
33 * requests to different OSDs when the cluster topology/data layout
34 * change, or retry the affected requests when the communications
35 * channel with an OSD is reset.
39 * calculate the mapping of a file extent onto an object, and fill out the
40 * request accordingly. shorten extent as necessary if it crosses an
43 * fill osd op in request message.
45 static void calc_layout(struct ceph_osd_client *osdc,
46 struct ceph_vino vino, struct ceph_file_layout *layout,
48 struct ceph_osd_request *req)
50 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
51 struct ceph_osd_op *op = (void *)(reqhead + 1);
53 u64 objoff, objlen; /* extent in object */
56 reqhead->snapid = cpu_to_le64(vino.snap);
59 ceph_calc_file_object_mapping(layout, off, plen, &bno,
62 dout(" skipping last %llu, final file extent %llu~%llu\n",
63 orig_len - *plen, off, *plen);
65 sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
66 req->r_oid_len = strlen(req->r_oid);
68 op->extent.offset = cpu_to_le64(objoff);
69 op->extent.length = cpu_to_le64(objlen);
70 req->r_num_pages = calc_pages_for(off, *plen);
72 dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
73 req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
80 void ceph_osdc_release_request(struct kref *kref)
82 struct ceph_osd_request *req = container_of(kref,
83 struct ceph_osd_request,
87 ceph_msg_put(req->r_request);
89 ceph_msg_put(req->r_reply);
90 if (req->r_con_filling_pages) {
91 dout("release_request revoking pages %p from con %p\n",
92 req->r_pages, req->r_con_filling_pages);
93 ceph_con_revoke_pages(req->r_con_filling_pages,
95 ceph_con_put(req->r_con_filling_pages);
98 ceph_release_page_vector(req->r_pages,
100 ceph_put_snap_context(req->r_snapc);
102 mempool_free(req, req->r_osdc->req_mempool);
108 * build new request AND message, calculate layout, and adjust file
111 * if the file was recently truncated, we include information about its
112 * old and new size so that the object can be updated appropriately. (we
113 * avoid synchronously deleting truncated objects because it's slow.)
115 * if @do_sync, include a 'startsync' command so that the osd will flush
118 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
119 struct ceph_file_layout *layout,
120 struct ceph_vino vino,
122 int opcode, int flags,
123 struct ceph_snap_context *snapc,
127 struct timespec *mtime,
128 bool use_mempool, int num_reply)
130 struct ceph_osd_request *req;
131 struct ceph_msg *msg;
132 struct ceph_osd_request_head *head;
133 struct ceph_osd_op *op;
135 int do_trunc = truncate_seq && (off + *plen > truncate_size);
136 int num_op = 1 + do_sync + do_trunc;
137 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
142 req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
143 memset(req, 0, sizeof(*req));
145 req = kzalloc(sizeof(*req), GFP_NOFS);
148 return ERR_PTR(-ENOMEM);
150 err = ceph_msgpool_resv(&osdc->msgpool_op_reply, num_reply);
152 ceph_osdc_put_request(req);
153 return ERR_PTR(-ENOMEM);
155 req->r_num_prealloc_reply = num_reply;
158 req->r_mempool = use_mempool;
159 kref_init(&req->r_kref);
160 init_completion(&req->r_completion);
161 init_completion(&req->r_safe_completion);
162 INIT_LIST_HEAD(&req->r_unsafe_item);
163 req->r_flags = flags;
165 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
167 /* create message; allow space for oid */
170 msg_size += sizeof(u64) * snapc->num_snaps;
172 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
174 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
176 ceph_msgpool_resv(&osdc->msgpool_op_reply, -num_reply);
177 ceph_osdc_put_request(req);
178 return ERR_PTR(PTR_ERR(msg));
180 msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
181 memset(msg->front.iov_base, 0, msg->front.iov_len);
182 head = msg->front.iov_base;
183 op = (void *)(head + 1);
184 p = (void *)(op + num_op);
186 req->r_request = msg;
187 req->r_snapc = ceph_get_snap_context(snapc);
189 head->client_inc = cpu_to_le32(1); /* always, for now. */
190 head->flags = cpu_to_le32(flags);
191 if (flags & CEPH_OSD_FLAG_WRITE)
192 ceph_encode_timespec(&head->mtime, mtime);
193 head->num_ops = cpu_to_le16(num_op);
194 op->op = cpu_to_le16(opcode);
196 /* calculate max write size */
197 calc_layout(osdc, vino, layout, off, plen, req);
198 req->r_file_layout = *layout; /* keep a copy */
200 if (flags & CEPH_OSD_FLAG_WRITE) {
201 req->r_request->hdr.data_off = cpu_to_le16(off);
202 req->r_request->hdr.data_len = cpu_to_le32(*plen);
203 op->payload_len = cpu_to_le32(*plen);
207 head->object_len = cpu_to_le32(req->r_oid_len);
208 memcpy(p, req->r_oid, req->r_oid_len);
214 op->op = cpu_to_le16(opcode == CEPH_OSD_OP_READ ?
215 CEPH_OSD_OP_MASKTRUNC : CEPH_OSD_OP_SETTRUNC);
216 op->trunc.truncate_seq = cpu_to_le32(truncate_seq);
217 prevofs = le64_to_cpu((op-1)->extent.offset);
218 op->trunc.truncate_size = cpu_to_le64(truncate_size -
223 op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
226 head->snap_seq = cpu_to_le64(snapc->seq);
227 head->num_snaps = cpu_to_le32(snapc->num_snaps);
228 for (i = 0; i < snapc->num_snaps; i++) {
229 put_unaligned_le64(snapc->snaps[i], p);
234 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
239 * We keep osd requests in an rbtree, sorted by ->r_tid.
241 static void __insert_request(struct ceph_osd_client *osdc,
242 struct ceph_osd_request *new)
244 struct rb_node **p = &osdc->requests.rb_node;
245 struct rb_node *parent = NULL;
246 struct ceph_osd_request *req = NULL;
250 req = rb_entry(parent, struct ceph_osd_request, r_node);
251 if (new->r_tid < req->r_tid)
253 else if (new->r_tid > req->r_tid)
259 rb_link_node(&new->r_node, parent, p);
260 rb_insert_color(&new->r_node, &osdc->requests);
263 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
266 struct ceph_osd_request *req;
267 struct rb_node *n = osdc->requests.rb_node;
270 req = rb_entry(n, struct ceph_osd_request, r_node);
271 if (tid < req->r_tid)
273 else if (tid > req->r_tid)
281 static struct ceph_osd_request *
282 __lookup_request_ge(struct ceph_osd_client *osdc,
285 struct ceph_osd_request *req;
286 struct rb_node *n = osdc->requests.rb_node;
289 req = rb_entry(n, struct ceph_osd_request, r_node);
290 if (tid < req->r_tid) {
294 } else if (tid > req->r_tid) {
305 * If the osd connection drops, we need to resubmit all requests.
307 static void osd_reset(struct ceph_connection *con)
309 struct ceph_osd *osd = con->private;
310 struct ceph_osd_client *osdc;
314 dout("osd_reset osd%d\n", osd->o_osd);
316 osd->o_incarnation++;
317 down_read(&osdc->map_sem);
318 kick_requests(osdc, osd);
319 up_read(&osdc->map_sem);
323 * Track open sessions with osds.
325 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
327 struct ceph_osd *osd;
329 osd = kzalloc(sizeof(*osd), GFP_NOFS);
333 atomic_set(&osd->o_ref, 1);
335 INIT_LIST_HEAD(&osd->o_requests);
336 osd->o_incarnation = 1;
338 ceph_con_init(osdc->client->msgr, &osd->o_con);
339 osd->o_con.private = osd;
340 osd->o_con.ops = &osd_con_ops;
341 osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
346 static struct ceph_osd *get_osd(struct ceph_osd *osd)
348 if (atomic_inc_not_zero(&osd->o_ref)) {
349 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
350 atomic_read(&osd->o_ref));
353 dout("get_osd %p FAIL\n", osd);
358 static void put_osd(struct ceph_osd *osd)
360 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
361 atomic_read(&osd->o_ref) - 1);
362 if (atomic_dec_and_test(&osd->o_ref))
367 * remove an osd from our map
369 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
371 dout("remove_osd %p\n", osd);
372 BUG_ON(!list_empty(&osd->o_requests));
373 rb_erase(&osd->o_node, &osdc->osds);
374 ceph_con_close(&osd->o_con);
381 static int reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
385 dout("reset_osd %p osd%d\n", osd, osd->o_osd);
386 if (list_empty(&osd->o_requests)) {
387 remove_osd(osdc, osd);
389 ceph_con_close(&osd->o_con);
390 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
391 osd->o_incarnation++;
396 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
398 struct rb_node **p = &osdc->osds.rb_node;
399 struct rb_node *parent = NULL;
400 struct ceph_osd *osd = NULL;
404 osd = rb_entry(parent, struct ceph_osd, o_node);
405 if (new->o_osd < osd->o_osd)
407 else if (new->o_osd > osd->o_osd)
413 rb_link_node(&new->o_node, parent, p);
414 rb_insert_color(&new->o_node, &osdc->osds);
417 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
419 struct ceph_osd *osd;
420 struct rb_node *n = osdc->osds.rb_node;
423 osd = rb_entry(n, struct ceph_osd, o_node);
426 else if (o > osd->o_osd)
436 * Register request, assign tid. If this is the first request, set up
439 static void register_request(struct ceph_osd_client *osdc,
440 struct ceph_osd_request *req)
442 mutex_lock(&osdc->request_mutex);
443 req->r_tid = ++osdc->last_tid;
444 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
446 dout("register_request %p tid %lld\n", req, req->r_tid);
447 __insert_request(osdc, req);
448 ceph_osdc_get_request(req);
449 osdc->num_requests++;
451 req->r_timeout_stamp =
452 jiffies + osdc->client->mount_args->osd_timeout*HZ;
454 if (osdc->num_requests == 1) {
455 osdc->timeout_tid = req->r_tid;
456 dout(" timeout on tid %llu at %lu\n", req->r_tid,
457 req->r_timeout_stamp);
458 schedule_delayed_work(&osdc->timeout_work,
459 round_jiffies_relative(req->r_timeout_stamp - jiffies));
461 mutex_unlock(&osdc->request_mutex);
465 * called under osdc->request_mutex
467 static void __unregister_request(struct ceph_osd_client *osdc,
468 struct ceph_osd_request *req)
470 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
471 rb_erase(&req->r_node, &osdc->requests);
472 osdc->num_requests--;
474 ceph_msgpool_resv(&osdc->msgpool_op_reply, -req->r_num_prealloc_reply);
477 /* make sure the original request isn't in flight. */
478 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
480 list_del_init(&req->r_osd_item);
481 if (list_empty(&req->r_osd->o_requests))
482 remove_osd(osdc, req->r_osd);
486 ceph_osdc_put_request(req);
488 if (req->r_tid == osdc->timeout_tid) {
489 if (osdc->num_requests == 0) {
490 dout("no requests, canceling timeout\n");
491 osdc->timeout_tid = 0;
492 cancel_delayed_work(&osdc->timeout_work);
494 req = rb_entry(rb_first(&osdc->requests),
495 struct ceph_osd_request, r_node);
496 osdc->timeout_tid = req->r_tid;
497 dout("rescheduled timeout on tid %llu at %lu\n",
498 req->r_tid, req->r_timeout_stamp);
499 schedule_delayed_work(&osdc->timeout_work,
500 round_jiffies_relative(req->r_timeout_stamp -
507 * Cancel a previously queued request message
509 static void __cancel_request(struct ceph_osd_request *req)
512 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
518 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
519 * (as needed), and set the request r_osd appropriately. If there is
520 * no up osd, set r_osd to NULL.
522 * Return 0 if unchanged, 1 if changed, or negative on error.
524 * Caller should hold map_sem for read and request_mutex.
526 static int __map_osds(struct ceph_osd_client *osdc,
527 struct ceph_osd_request *req)
529 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
533 struct ceph_osd *newosd = NULL;
535 dout("map_osds %p tid %lld\n", req, req->r_tid);
536 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
537 &req->r_file_layout, osdc->osdmap);
540 pgid = reqhead->layout.ol_pgid;
541 o = ceph_calc_pg_primary(osdc->osdmap, pgid);
543 if ((req->r_osd && req->r_osd->o_osd == o &&
544 req->r_sent >= req->r_osd->o_incarnation) ||
545 (req->r_osd == NULL && o == -1))
546 return 0; /* no change */
548 dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
549 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
550 req->r_osd ? req->r_osd->o_osd : -1);
553 __cancel_request(req);
554 list_del_init(&req->r_osd_item);
555 if (list_empty(&req->r_osd->o_requests)) {
556 /* try to re-use r_osd if possible */
557 newosd = get_osd(req->r_osd);
558 remove_osd(osdc, newosd);
563 req->r_osd = __lookup_osd(osdc, o);
564 if (!req->r_osd && o >= 0) {
570 req->r_osd = create_osd(osdc);
575 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
576 req->r_osd->o_osd = o;
577 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
578 __insert_osd(osdc, req->r_osd);
580 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
584 list_add(&req->r_osd_item, &req->r_osd->o_requests);
585 err = 1; /* osd changed */
594 * caller should hold map_sem (for read) and request_mutex
596 static int __send_request(struct ceph_osd_client *osdc,
597 struct ceph_osd_request *req)
599 struct ceph_osd_request_head *reqhead;
602 err = __map_osds(osdc, req);
605 if (req->r_osd == NULL) {
606 dout("send_request %p no up osds in pg\n", req);
607 ceph_monc_request_next_osdmap(&osdc->client->monc);
611 dout("send_request %p tid %llu to osd%d flags %d\n",
612 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
614 reqhead = req->r_request->front.iov_base;
615 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
616 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
617 reqhead->reassert_version = req->r_reassert_version;
619 req->r_timeout_stamp = jiffies+osdc->client->mount_args->osd_timeout*HZ;
621 ceph_msg_get(req->r_request); /* send consumes a ref */
622 ceph_con_send(&req->r_osd->o_con, req->r_request);
623 req->r_sent = req->r_osd->o_incarnation;
628 * Timeout callback, called every N seconds when 1 or more osd
629 * requests has been active for more than N seconds. When this
630 * happens, we ping all OSDs with requests who have timed out to
631 * ensure any communications channel reset is detected. Reset the
632 * request timeouts another N seconds in the future as we go.
633 * Reschedule the timeout event another N seconds in future (unless
634 * there are no open requests).
636 static void handle_timeout(struct work_struct *work)
638 struct ceph_osd_client *osdc =
639 container_of(work, struct ceph_osd_client, timeout_work.work);
640 struct ceph_osd_request *req;
641 struct ceph_osd *osd;
642 unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
643 unsigned long next_timeout = timeout + jiffies;
647 down_read(&osdc->map_sem);
649 ceph_monc_request_next_osdmap(&osdc->client->monc);
651 mutex_lock(&osdc->request_mutex);
652 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
653 req = rb_entry(p, struct ceph_osd_request, r_node);
658 dout("osdc resending prev failed %lld\n", req->r_tid);
659 err = __send_request(osdc, req);
661 dout("osdc failed again on %lld\n", req->r_tid);
663 req->r_resend = false;
667 for (p = rb_first(&osdc->osds); p; p = rb_next(p)) {
668 osd = rb_entry(p, struct ceph_osd, o_node);
669 if (list_empty(&osd->o_requests))
671 req = list_first_entry(&osd->o_requests,
672 struct ceph_osd_request, r_osd_item);
673 if (time_before(jiffies, req->r_timeout_stamp))
676 dout(" tid %llu (at least) timed out on osd%d\n",
677 req->r_tid, osd->o_osd);
678 req->r_timeout_stamp = next_timeout;
679 ceph_con_keepalive(&osd->o_con);
682 if (osdc->timeout_tid)
683 schedule_delayed_work(&osdc->timeout_work,
684 round_jiffies_relative(timeout));
686 mutex_unlock(&osdc->request_mutex);
688 up_read(&osdc->map_sem);
692 * handle osd op reply. either call the callback if it is specified,
693 * or do the completion to wake up the waiting thread.
695 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
696 struct ceph_connection *con)
698 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
699 struct ceph_osd_request *req;
701 int numops, object_len, flags;
703 tid = le64_to_cpu(msg->hdr.tid);
704 if (msg->front.iov_len < sizeof(*rhead))
706 numops = le32_to_cpu(rhead->num_ops);
707 object_len = le32_to_cpu(rhead->object_len);
708 if (msg->front.iov_len != sizeof(*rhead) + object_len +
709 numops * sizeof(struct ceph_osd_op))
711 dout("handle_reply %p tid %llu\n", msg, tid);
714 mutex_lock(&osdc->request_mutex);
715 req = __lookup_request(osdc, tid);
717 dout("handle_reply tid %llu dne\n", tid);
718 mutex_unlock(&osdc->request_mutex);
721 ceph_osdc_get_request(req);
722 flags = le32_to_cpu(rhead->flags);
725 * if this connection filled our pages, drop our reference now, to
726 * avoid a (safe but slower) revoke later.
728 if (req->r_con_filling_pages == con && req->r_pages == msg->pages) {
729 dout(" got pages, dropping con_filling_pages ref %p\n", con);
730 req->r_con_filling_pages = NULL;
736 * once we see the message has been received, we don't
737 * need a ref (which is only needed for revoking
740 ceph_msg_put(req->r_reply);
744 if (!req->r_got_reply) {
747 req->r_result = le32_to_cpu(rhead->result);
748 bytes = le32_to_cpu(msg->hdr.data_len);
749 dout("handle_reply result %d bytes %d\n", req->r_result,
751 if (req->r_result == 0)
752 req->r_result = bytes;
754 /* in case this is a write and we need to replay, */
755 req->r_reassert_version = rhead->reassert_version;
757 req->r_got_reply = 1;
758 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
759 dout("handle_reply tid %llu dup ack\n", tid);
760 mutex_unlock(&osdc->request_mutex);
764 dout("handle_reply tid %llu flags %d\n", tid, flags);
766 /* either this is a read, or we got the safe response */
767 if ((flags & CEPH_OSD_FLAG_ONDISK) ||
768 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
769 __unregister_request(osdc, req);
771 mutex_unlock(&osdc->request_mutex);
774 req->r_callback(req, msg);
776 complete(&req->r_completion);
778 if (flags & CEPH_OSD_FLAG_ONDISK) {
779 if (req->r_safe_callback)
780 req->r_safe_callback(req, msg);
781 complete(&req->r_safe_completion); /* fsync waiter */
785 ceph_osdc_put_request(req);
789 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
790 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
791 (int)sizeof(*rhead));
797 * Resubmit osd requests whose osd or osd address has changed. Request
798 * a new osd map if osds are down, or we are otherwise unable to determine
799 * how to direct a request.
801 * Close connections to down osds.
803 * If @who is specified, resubmit requests for that specific osd.
805 * Caller should hold map_sem for read and request_mutex.
807 static void kick_requests(struct ceph_osd_client *osdc,
808 struct ceph_osd *kickosd)
810 struct ceph_osd_request *req;
811 struct rb_node *p, *n;
815 dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
816 mutex_lock(&osdc->request_mutex);
818 for (p = rb_first(&osdc->osds); p; p = n) {
819 struct ceph_osd *osd =
820 rb_entry(p, struct ceph_osd, o_node);
823 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
824 memcmp(&osd->o_con.peer_addr,
825 ceph_osd_addr(osdc->osdmap,
827 sizeof(struct ceph_entity_addr)) != 0)
828 reset_osd(osdc, osd);
832 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
833 req = rb_entry(p, struct ceph_osd_request, r_node);
836 dout(" r_resend set on tid %llu\n", req->r_tid);
837 __cancel_request(req);
840 if (req->r_osd && kickosd == req->r_osd) {
841 __cancel_request(req);
845 err = __map_osds(osdc, req);
847 continue; /* no change */
850 * FIXME: really, we should set the request
851 * error and fail if this isn't a 'nofail'
852 * request, but that's a fair bit more
853 * complicated to do. So retry!
855 dout(" setting r_resend on %llu\n", req->r_tid);
856 req->r_resend = true;
859 if (req->r_osd == NULL) {
860 dout("tid %llu maps to no valid osd\n", req->r_tid);
861 needmap++; /* request a newer map */
866 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
868 req->r_flags |= CEPH_OSD_FLAG_RETRY;
869 err = __send_request(osdc, req);
871 dout(" setting r_resend on %llu\n", req->r_tid);
872 req->r_resend = true;
875 mutex_unlock(&osdc->request_mutex);
878 dout("%d requests for down osds, need new map\n", needmap);
879 ceph_monc_request_next_osdmap(&osdc->client->monc);
884 * Process updated osd map.
886 * The message contains any number of incremental and full maps, normally
887 * indicating some sort of topology change in the cluster. Kick requests
888 * off to different OSDs as needed.
890 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
892 void *p, *end, *next;
895 struct ceph_osdmap *newmap = NULL, *oldmap;
897 struct ceph_fsid fsid;
899 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
900 p = msg->front.iov_base;
901 end = p + msg->front.iov_len;
904 ceph_decode_need(&p, end, sizeof(fsid), bad);
905 ceph_decode_copy(&p, &fsid, sizeof(fsid));
906 if (ceph_check_fsid(osdc->client, &fsid) < 0)
909 down_write(&osdc->map_sem);
911 /* incremental maps */
912 ceph_decode_32_safe(&p, end, nr_maps, bad);
913 dout(" %d inc maps\n", nr_maps);
914 while (nr_maps > 0) {
915 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
916 epoch = ceph_decode_32(&p);
917 maplen = ceph_decode_32(&p);
918 ceph_decode_need(&p, end, maplen, bad);
920 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
921 dout("applying incremental map %u len %d\n",
923 newmap = osdmap_apply_incremental(&p, next,
926 if (IS_ERR(newmap)) {
927 err = PTR_ERR(newmap);
931 if (newmap != osdc->osdmap) {
932 ceph_osdmap_destroy(osdc->osdmap);
933 osdc->osdmap = newmap;
936 dout("ignoring incremental map %u len %d\n",
946 ceph_decode_32_safe(&p, end, nr_maps, bad);
947 dout(" %d full maps\n", nr_maps);
949 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
950 epoch = ceph_decode_32(&p);
951 maplen = ceph_decode_32(&p);
952 ceph_decode_need(&p, end, maplen, bad);
954 dout("skipping non-latest full map %u len %d\n",
956 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
957 dout("skipping full map %u len %d, "
958 "older than our %u\n", epoch, maplen,
959 osdc->osdmap->epoch);
961 dout("taking full map %u len %d\n", epoch, maplen);
962 newmap = osdmap_decode(&p, p+maplen);
963 if (IS_ERR(newmap)) {
964 err = PTR_ERR(newmap);
968 oldmap = osdc->osdmap;
969 osdc->osdmap = newmap;
971 ceph_osdmap_destroy(oldmap);
978 downgrade_write(&osdc->map_sem);
979 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
981 kick_requests(osdc, NULL);
982 up_read(&osdc->map_sem);
986 pr_err("osdc handle_map corrupt msg\n");
988 up_write(&osdc->map_sem);
994 * A read request prepares specific pages that data is to be read into.
995 * When a message is being read off the wire, we call prepare_pages to
997 * 0 = success, -1 failure.
999 static int prepare_pages(struct ceph_connection *con, struct ceph_msg *m,
1002 struct ceph_osd *osd = con->private;
1003 struct ceph_osd_client *osdc;
1004 struct ceph_osd_request *req;
1007 int type = le16_to_cpu(m->hdr.type);
1013 dout("prepare_pages on msg %p want %d\n", m, want);
1014 if (unlikely(type != CEPH_MSG_OSD_OPREPLY))
1015 return -1; /* hmm! */
1017 tid = le64_to_cpu(m->hdr.tid);
1018 mutex_lock(&osdc->request_mutex);
1019 req = __lookup_request(osdc, tid);
1021 dout("prepare_pages unknown tid %llu\n", tid);
1024 dout("prepare_pages tid %llu has %d pages, want %d\n",
1025 tid, req->r_num_pages, want);
1026 if (unlikely(req->r_num_pages < want))
1029 if (req->r_con_filling_pages) {
1030 dout("revoking pages %p from old con %p\n", req->r_pages,
1031 req->r_con_filling_pages);
1032 ceph_con_revoke_pages(req->r_con_filling_pages, req->r_pages);
1033 ceph_con_put(req->r_con_filling_pages);
1035 req->r_con_filling_pages = ceph_con_get(con);
1036 req->r_reply = ceph_msg_get(m); /* for duration of read over socket */
1037 m->pages = req->r_pages;
1038 m->nr_pages = req->r_num_pages;
1039 ret = 0; /* success */
1041 mutex_unlock(&osdc->request_mutex);
1046 * Register request, send initial attempt.
1048 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1049 struct ceph_osd_request *req,
1054 req->r_request->pages = req->r_pages;
1055 req->r_request->nr_pages = req->r_num_pages;
1057 register_request(osdc, req);
1059 down_read(&osdc->map_sem);
1060 mutex_lock(&osdc->request_mutex);
1062 * a racing kick_requests() may have sent the message for us
1063 * while we dropped request_mutex above, so only send now if
1064 * the request still han't been touched yet.
1066 if (req->r_sent == 0) {
1067 rc = __send_request(osdc, req);
1070 dout("osdc_start_request failed send, "
1071 " marking %lld\n", req->r_tid);
1072 req->r_resend = true;
1075 __unregister_request(osdc, req);
1079 mutex_unlock(&osdc->request_mutex);
1080 up_read(&osdc->map_sem);
1085 * wait for a request to complete
1087 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1088 struct ceph_osd_request *req)
1092 rc = wait_for_completion_interruptible(&req->r_completion);
1094 mutex_lock(&osdc->request_mutex);
1095 __cancel_request(req);
1096 __unregister_request(osdc, req);
1097 mutex_unlock(&osdc->request_mutex);
1098 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1102 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1103 return req->r_result;
1107 * sync - wait for all in-flight requests to flush. avoid starvation.
1109 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1111 struct ceph_osd_request *req;
1112 u64 last_tid, next_tid = 0;
1114 mutex_lock(&osdc->request_mutex);
1115 last_tid = osdc->last_tid;
1117 req = __lookup_request_ge(osdc, next_tid);
1120 if (req->r_tid > last_tid)
1123 next_tid = req->r_tid + 1;
1124 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1127 ceph_osdc_get_request(req);
1128 mutex_unlock(&osdc->request_mutex);
1129 dout("sync waiting on tid %llu (last is %llu)\n",
1130 req->r_tid, last_tid);
1131 wait_for_completion(&req->r_safe_completion);
1132 mutex_lock(&osdc->request_mutex);
1133 ceph_osdc_put_request(req);
1135 mutex_unlock(&osdc->request_mutex);
1136 dout("sync done (thru tid %llu)\n", last_tid);
1142 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1147 osdc->client = client;
1148 osdc->osdmap = NULL;
1149 init_rwsem(&osdc->map_sem);
1150 init_completion(&osdc->map_waiters);
1151 osdc->last_requested_map = 0;
1152 mutex_init(&osdc->request_mutex);
1153 osdc->timeout_tid = 0;
1155 osdc->osds = RB_ROOT;
1156 osdc->requests = RB_ROOT;
1157 osdc->num_requests = 0;
1158 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1161 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1162 sizeof(struct ceph_osd_request));
1163 if (!osdc->req_mempool)
1166 err = ceph_msgpool_init(&osdc->msgpool_op, 4096, 10, true);
1169 err = ceph_msgpool_init(&osdc->msgpool_op_reply, 512, 0, false);
1175 ceph_msgpool_destroy(&osdc->msgpool_op);
1177 mempool_destroy(osdc->req_mempool);
1182 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1184 cancel_delayed_work_sync(&osdc->timeout_work);
1186 ceph_osdmap_destroy(osdc->osdmap);
1187 osdc->osdmap = NULL;
1189 mempool_destroy(osdc->req_mempool);
1190 ceph_msgpool_destroy(&osdc->msgpool_op);
1191 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1195 * Read some contiguous pages. If we cross a stripe boundary, shorten
1196 * *plen. Return number of bytes read, or error.
1198 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1199 struct ceph_vino vino, struct ceph_file_layout *layout,
1201 u32 truncate_seq, u64 truncate_size,
1202 struct page **pages, int num_pages)
1204 struct ceph_osd_request *req;
1207 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1208 vino.snap, off, *plen);
1209 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1210 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1211 NULL, 0, truncate_seq, truncate_size, NULL,
1214 return PTR_ERR(req);
1216 /* it may be a short read due to an object boundary */
1217 req->r_pages = pages;
1218 num_pages = calc_pages_for(off, *plen);
1219 req->r_num_pages = num_pages;
1221 dout("readpages final extent is %llu~%llu (%d pages)\n",
1222 off, *plen, req->r_num_pages);
1224 rc = ceph_osdc_start_request(osdc, req, false);
1226 rc = ceph_osdc_wait_request(osdc, req);
1228 ceph_osdc_put_request(req);
1229 dout("readpages result %d\n", rc);
1234 * do a synchronous write on N pages
1236 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1237 struct ceph_file_layout *layout,
1238 struct ceph_snap_context *snapc,
1240 u32 truncate_seq, u64 truncate_size,
1241 struct timespec *mtime,
1242 struct page **pages, int num_pages,
1243 int flags, int do_sync, bool nofail)
1245 struct ceph_osd_request *req;
1248 BUG_ON(vino.snap != CEPH_NOSNAP);
1249 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1251 flags | CEPH_OSD_FLAG_ONDISK |
1252 CEPH_OSD_FLAG_WRITE,
1254 truncate_seq, truncate_size, mtime,
1257 return PTR_ERR(req);
1259 /* it may be a short write due to an object boundary */
1260 req->r_pages = pages;
1261 req->r_num_pages = calc_pages_for(off, len);
1262 dout("writepages %llu~%llu (%d pages)\n", off, len,
1265 rc = ceph_osdc_start_request(osdc, req, nofail);
1267 rc = ceph_osdc_wait_request(osdc, req);
1269 ceph_osdc_put_request(req);
1272 dout("writepages result %d\n", rc);
1277 * handle incoming message
1279 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1281 struct ceph_osd *osd = con->private;
1282 struct ceph_osd_client *osdc;
1283 int type = le16_to_cpu(msg->hdr.type);
1290 case CEPH_MSG_OSD_MAP:
1291 ceph_osdc_handle_map(osdc, msg);
1293 case CEPH_MSG_OSD_OPREPLY:
1294 handle_reply(osdc, msg, con);
1298 pr_err("received unknown message type %d %s\n", type,
1299 ceph_msg_type_name(type));
1304 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1305 struct ceph_msg_header *hdr)
1307 struct ceph_osd *osd = con->private;
1308 struct ceph_osd_client *osdc = osd->o_osdc;
1309 int type = le16_to_cpu(hdr->type);
1310 int front = le32_to_cpu(hdr->front_len);
1313 case CEPH_MSG_OSD_OPREPLY:
1314 return ceph_msgpool_get(&osdc->msgpool_op_reply, front);
1316 return ceph_alloc_msg(con, hdr);
1320 * Wrappers to refcount containing ceph_osd struct
1322 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1324 struct ceph_osd *osd = con->private;
1330 static void put_osd_con(struct ceph_connection *con)
1332 struct ceph_osd *osd = con->private;
1339 static int get_authorizer(struct ceph_connection *con,
1340 void **buf, int *len, int *proto,
1341 void **reply_buf, int *reply_len, int force_new)
1343 struct ceph_osd *o = con->private;
1344 struct ceph_osd_client *osdc = o->o_osdc;
1345 struct ceph_auth_client *ac = osdc->client->monc.auth;
1348 if (force_new && o->o_authorizer) {
1349 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1350 o->o_authorizer = NULL;
1352 if (o->o_authorizer == NULL) {
1353 ret = ac->ops->create_authorizer(
1354 ac, CEPH_ENTITY_TYPE_OSD,
1356 &o->o_authorizer_buf,
1357 &o->o_authorizer_buf_len,
1358 &o->o_authorizer_reply_buf,
1359 &o->o_authorizer_reply_buf_len);
1364 *proto = ac->protocol;
1365 *buf = o->o_authorizer_buf;
1366 *len = o->o_authorizer_buf_len;
1367 *reply_buf = o->o_authorizer_reply_buf;
1368 *reply_len = o->o_authorizer_reply_buf_len;
1373 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1375 struct ceph_osd *o = con->private;
1376 struct ceph_osd_client *osdc = o->o_osdc;
1377 struct ceph_auth_client *ac = osdc->client->monc.auth;
1379 return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1383 const static struct ceph_connection_operations osd_con_ops = {
1386 .dispatch = dispatch,
1387 .get_authorizer = get_authorizer,
1388 .verify_authorizer_reply = verify_authorizer_reply,
1389 .alloc_msg = alloc_msg,
1391 .alloc_middle = ceph_alloc_middle,
1392 .prepare_pages = prepare_pages,