Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[linux-2.6.git] / fs / ceph / osd_client.c
1 #include "ceph_debug.h"
2
3 #include <linux/err.h>
4 #include <linux/highmem.h>
5 #include <linux/mm.h>
6 #include <linux/pagemap.h>
7 #include <linux/slab.h>
8 #include <linux/uaccess.h>
9
10 #include "super.h"
11 #include "osd_client.h"
12 #include "messenger.h"
13 #include "decode.h"
14 #include "auth.h"
15
16 #define OSD_OP_FRONT_LEN        4096
17 #define OSD_OPREPLY_FRONT_LEN   512
18
19 const static struct ceph_connection_operations osd_con_ops;
20 static int __kick_requests(struct ceph_osd_client *osdc,
21                           struct ceph_osd *kickosd);
22
23 static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
24
25 /*
26  * Implement client access to distributed object storage cluster.
27  *
28  * All data objects are stored within a cluster/cloud of OSDs, or
29  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
30  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
31  * remote daemons serving up and coordinating consistent and safe
32  * access to storage.
33  *
34  * Cluster membership and the mapping of data objects onto storage devices
35  * are described by the osd map.
36  *
37  * We keep track of pending OSD requests (read, write), resubmit
38  * requests to different OSDs when the cluster topology/data layout
39  * change, or retry the affected requests when the communications
40  * channel with an OSD is reset.
41  */
42
43 /*
44  * calculate the mapping of a file extent onto an object, and fill out the
45  * request accordingly.  shorten extent as necessary if it crosses an
46  * object boundary.
47  *
48  * fill osd op in request message.
49  */
50 static void calc_layout(struct ceph_osd_client *osdc,
51                         struct ceph_vino vino, struct ceph_file_layout *layout,
52                         u64 off, u64 *plen,
53                         struct ceph_osd_request *req)
54 {
55         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
56         struct ceph_osd_op *op = (void *)(reqhead + 1);
57         u64 orig_len = *plen;
58         u64 objoff, objlen;    /* extent in object */
59         u64 bno;
60
61         reqhead->snapid = cpu_to_le64(vino.snap);
62
63         /* object extent? */
64         ceph_calc_file_object_mapping(layout, off, plen, &bno,
65                                       &objoff, &objlen);
66         if (*plen < orig_len)
67                 dout(" skipping last %llu, final file extent %llu~%llu\n",
68                      orig_len - *plen, off, *plen);
69
70         sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
71         req->r_oid_len = strlen(req->r_oid);
72
73         op->extent.offset = cpu_to_le64(objoff);
74         op->extent.length = cpu_to_le64(objlen);
75         req->r_num_pages = calc_pages_for(off, *plen);
76
77         dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
78              req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
79 }
80
81 /*
82  * requests
83  */
84 void ceph_osdc_release_request(struct kref *kref)
85 {
86         struct ceph_osd_request *req = container_of(kref,
87                                                     struct ceph_osd_request,
88                                                     r_kref);
89
90         if (req->r_request)
91                 ceph_msg_put(req->r_request);
92         if (req->r_reply)
93                 ceph_msg_put(req->r_reply);
94         if (req->r_con_filling_msg) {
95                 dout("release_request revoking pages %p from con %p\n",
96                      req->r_pages, req->r_con_filling_msg);
97                 ceph_con_revoke_message(req->r_con_filling_msg,
98                                       req->r_reply);
99                 ceph_con_put(req->r_con_filling_msg);
100         }
101         if (req->r_own_pages)
102                 ceph_release_page_vector(req->r_pages,
103                                          req->r_num_pages);
104         ceph_put_snap_context(req->r_snapc);
105         if (req->r_mempool)
106                 mempool_free(req, req->r_osdc->req_mempool);
107         else
108                 kfree(req);
109 }
110
111 /*
112  * build new request AND message, calculate layout, and adjust file
113  * extent as needed.
114  *
115  * if the file was recently truncated, we include information about its
116  * old and new size so that the object can be updated appropriately.  (we
117  * avoid synchronously deleting truncated objects because it's slow.)
118  *
119  * if @do_sync, include a 'startsync' command so that the osd will flush
120  * data quickly.
121  */
122 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
123                                                struct ceph_file_layout *layout,
124                                                struct ceph_vino vino,
125                                                u64 off, u64 *plen,
126                                                int opcode, int flags,
127                                                struct ceph_snap_context *snapc,
128                                                int do_sync,
129                                                u32 truncate_seq,
130                                                u64 truncate_size,
131                                                struct timespec *mtime,
132                                                bool use_mempool, int num_reply)
133 {
134         struct ceph_osd_request *req;
135         struct ceph_msg *msg;
136         struct ceph_osd_request_head *head;
137         struct ceph_osd_op *op;
138         void *p;
139         int num_op = 1 + do_sync;
140         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
141         int i;
142
143         if (use_mempool) {
144                 req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
145                 memset(req, 0, sizeof(*req));
146         } else {
147                 req = kzalloc(sizeof(*req), GFP_NOFS);
148         }
149         if (req == NULL)
150                 return ERR_PTR(-ENOMEM);
151
152         req->r_osdc = osdc;
153         req->r_mempool = use_mempool;
154         kref_init(&req->r_kref);
155         init_completion(&req->r_completion);
156         init_completion(&req->r_safe_completion);
157         INIT_LIST_HEAD(&req->r_unsafe_item);
158         req->r_flags = flags;
159
160         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
161
162         /* create reply message */
163         if (use_mempool)
164                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
165         else
166                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
167                                    OSD_OPREPLY_FRONT_LEN, 0, 0, NULL);
168         if (IS_ERR(msg)) {
169                 ceph_osdc_put_request(req);
170                 return ERR_PTR(PTR_ERR(msg));
171         }
172         req->r_reply = msg;
173
174         /* create request message; allow space for oid */
175         msg_size += 40;
176         if (snapc)
177                 msg_size += sizeof(u64) * snapc->num_snaps;
178         if (use_mempool)
179                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
180         else
181                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
182         if (IS_ERR(msg)) {
183                 ceph_osdc_put_request(req);
184                 return ERR_PTR(PTR_ERR(msg));
185         }
186         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
187         memset(msg->front.iov_base, 0, msg->front.iov_len);
188         head = msg->front.iov_base;
189         op = (void *)(head + 1);
190         p = (void *)(op + num_op);
191
192         req->r_request = msg;
193         req->r_snapc = ceph_get_snap_context(snapc);
194
195         head->client_inc = cpu_to_le32(1); /* always, for now. */
196         head->flags = cpu_to_le32(flags);
197         if (flags & CEPH_OSD_FLAG_WRITE)
198                 ceph_encode_timespec(&head->mtime, mtime);
199         head->num_ops = cpu_to_le16(num_op);
200         op->op = cpu_to_le16(opcode);
201
202         /* calculate max write size */
203         calc_layout(osdc, vino, layout, off, plen, req);
204         req->r_file_layout = *layout;  /* keep a copy */
205
206         if (flags & CEPH_OSD_FLAG_WRITE) {
207                 req->r_request->hdr.data_off = cpu_to_le16(off);
208                 req->r_request->hdr.data_len = cpu_to_le32(*plen);
209                 op->payload_len = cpu_to_le32(*plen);
210         }
211         op->extent.truncate_size = cpu_to_le64(truncate_size);
212         op->extent.truncate_seq = cpu_to_le32(truncate_seq);
213
214         /* fill in oid */
215         head->object_len = cpu_to_le32(req->r_oid_len);
216         memcpy(p, req->r_oid, req->r_oid_len);
217         p += req->r_oid_len;
218
219         if (do_sync) {
220                 op++;
221                 op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
222         }
223         if (snapc) {
224                 head->snap_seq = cpu_to_le64(snapc->seq);
225                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
226                 for (i = 0; i < snapc->num_snaps; i++) {
227                         put_unaligned_le64(snapc->snaps[i], p);
228                         p += sizeof(u64);
229                 }
230         }
231
232         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
233         msg_size = p - msg->front.iov_base;
234         msg->front.iov_len = msg_size;
235         msg->hdr.front_len = cpu_to_le32(msg_size);
236         return req;
237 }
238
239 /*
240  * We keep osd requests in an rbtree, sorted by ->r_tid.
241  */
242 static void __insert_request(struct ceph_osd_client *osdc,
243                              struct ceph_osd_request *new)
244 {
245         struct rb_node **p = &osdc->requests.rb_node;
246         struct rb_node *parent = NULL;
247         struct ceph_osd_request *req = NULL;
248
249         while (*p) {
250                 parent = *p;
251                 req = rb_entry(parent, struct ceph_osd_request, r_node);
252                 if (new->r_tid < req->r_tid)
253                         p = &(*p)->rb_left;
254                 else if (new->r_tid > req->r_tid)
255                         p = &(*p)->rb_right;
256                 else
257                         BUG();
258         }
259
260         rb_link_node(&new->r_node, parent, p);
261         rb_insert_color(&new->r_node, &osdc->requests);
262 }
263
264 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
265                                                  u64 tid)
266 {
267         struct ceph_osd_request *req;
268         struct rb_node *n = osdc->requests.rb_node;
269
270         while (n) {
271                 req = rb_entry(n, struct ceph_osd_request, r_node);
272                 if (tid < req->r_tid)
273                         n = n->rb_left;
274                 else if (tid > req->r_tid)
275                         n = n->rb_right;
276                 else
277                         return req;
278         }
279         return NULL;
280 }
281
282 static struct ceph_osd_request *
283 __lookup_request_ge(struct ceph_osd_client *osdc,
284                     u64 tid)
285 {
286         struct ceph_osd_request *req;
287         struct rb_node *n = osdc->requests.rb_node;
288
289         while (n) {
290                 req = rb_entry(n, struct ceph_osd_request, r_node);
291                 if (tid < req->r_tid) {
292                         if (!n->rb_left)
293                                 return req;
294                         n = n->rb_left;
295                 } else if (tid > req->r_tid) {
296                         n = n->rb_right;
297                 } else {
298                         return req;
299                 }
300         }
301         return NULL;
302 }
303
304
305 /*
306  * If the osd connection drops, we need to resubmit all requests.
307  */
308 static void osd_reset(struct ceph_connection *con)
309 {
310         struct ceph_osd *osd = con->private;
311         struct ceph_osd_client *osdc;
312
313         if (!osd)
314                 return;
315         dout("osd_reset osd%d\n", osd->o_osd);
316         osdc = osd->o_osdc;
317         down_read(&osdc->map_sem);
318         kick_requests(osdc, osd);
319         up_read(&osdc->map_sem);
320 }
321
322 /*
323  * Track open sessions with osds.
324  */
325 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
326 {
327         struct ceph_osd *osd;
328
329         osd = kzalloc(sizeof(*osd), GFP_NOFS);
330         if (!osd)
331                 return NULL;
332
333         atomic_set(&osd->o_ref, 1);
334         osd->o_osdc = osdc;
335         INIT_LIST_HEAD(&osd->o_requests);
336         INIT_LIST_HEAD(&osd->o_osd_lru);
337         osd->o_incarnation = 1;
338
339         ceph_con_init(osdc->client->msgr, &osd->o_con);
340         osd->o_con.private = osd;
341         osd->o_con.ops = &osd_con_ops;
342         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
343
344         INIT_LIST_HEAD(&osd->o_keepalive_item);
345         return osd;
346 }
347
348 static struct ceph_osd *get_osd(struct ceph_osd *osd)
349 {
350         if (atomic_inc_not_zero(&osd->o_ref)) {
351                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
352                      atomic_read(&osd->o_ref));
353                 return osd;
354         } else {
355                 dout("get_osd %p FAIL\n", osd);
356                 return NULL;
357         }
358 }
359
360 static void put_osd(struct ceph_osd *osd)
361 {
362         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
363              atomic_read(&osd->o_ref) - 1);
364         if (atomic_dec_and_test(&osd->o_ref))
365                 kfree(osd);
366 }
367
368 /*
369  * remove an osd from our map
370  */
371 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
372 {
373         dout("__remove_osd %p\n", osd);
374         BUG_ON(!list_empty(&osd->o_requests));
375         rb_erase(&osd->o_node, &osdc->osds);
376         list_del_init(&osd->o_osd_lru);
377         ceph_con_close(&osd->o_con);
378         put_osd(osd);
379 }
380
381 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
382                               struct ceph_osd *osd)
383 {
384         dout("__move_osd_to_lru %p\n", osd);
385         BUG_ON(!list_empty(&osd->o_osd_lru));
386         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
387         osd->lru_ttl = jiffies + osdc->client->mount_args->osd_idle_ttl * HZ;
388 }
389
390 static void __remove_osd_from_lru(struct ceph_osd *osd)
391 {
392         dout("__remove_osd_from_lru %p\n", osd);
393         if (!list_empty(&osd->o_osd_lru))
394                 list_del_init(&osd->o_osd_lru);
395 }
396
397 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
398 {
399         struct ceph_osd *osd, *nosd;
400
401         dout("__remove_old_osds %p\n", osdc);
402         mutex_lock(&osdc->request_mutex);
403         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
404                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
405                         break;
406                 __remove_osd(osdc, osd);
407         }
408         mutex_unlock(&osdc->request_mutex);
409 }
410
411 /*
412  * reset osd connect
413  */
414 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
415 {
416         int ret = 0;
417
418         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
419         if (list_empty(&osd->o_requests)) {
420                 __remove_osd(osdc, osd);
421         } else {
422                 ceph_con_close(&osd->o_con);
423                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
424                 osd->o_incarnation++;
425         }
426         return ret;
427 }
428
429 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
430 {
431         struct rb_node **p = &osdc->osds.rb_node;
432         struct rb_node *parent = NULL;
433         struct ceph_osd *osd = NULL;
434
435         while (*p) {
436                 parent = *p;
437                 osd = rb_entry(parent, struct ceph_osd, o_node);
438                 if (new->o_osd < osd->o_osd)
439                         p = &(*p)->rb_left;
440                 else if (new->o_osd > osd->o_osd)
441                         p = &(*p)->rb_right;
442                 else
443                         BUG();
444         }
445
446         rb_link_node(&new->o_node, parent, p);
447         rb_insert_color(&new->o_node, &osdc->osds);
448 }
449
450 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
451 {
452         struct ceph_osd *osd;
453         struct rb_node *n = osdc->osds.rb_node;
454
455         while (n) {
456                 osd = rb_entry(n, struct ceph_osd, o_node);
457                 if (o < osd->o_osd)
458                         n = n->rb_left;
459                 else if (o > osd->o_osd)
460                         n = n->rb_right;
461                 else
462                         return osd;
463         }
464         return NULL;
465 }
466
467 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
468 {
469         schedule_delayed_work(&osdc->timeout_work,
470                         osdc->client->mount_args->osd_keepalive_timeout * HZ);
471 }
472
473 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
474 {
475         cancel_delayed_work(&osdc->timeout_work);
476 }
477
478 /*
479  * Register request, assign tid.  If this is the first request, set up
480  * the timeout event.
481  */
482 static void register_request(struct ceph_osd_client *osdc,
483                              struct ceph_osd_request *req)
484 {
485         mutex_lock(&osdc->request_mutex);
486         req->r_tid = ++osdc->last_tid;
487         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
488         INIT_LIST_HEAD(&req->r_req_lru_item);
489
490         dout("register_request %p tid %lld\n", req, req->r_tid);
491         __insert_request(osdc, req);
492         ceph_osdc_get_request(req);
493         osdc->num_requests++;
494
495         if (osdc->num_requests == 1) {
496                 dout(" first request, scheduling timeout\n");
497                 __schedule_osd_timeout(osdc);
498         }
499         mutex_unlock(&osdc->request_mutex);
500 }
501
502 /*
503  * called under osdc->request_mutex
504  */
505 static void __unregister_request(struct ceph_osd_client *osdc,
506                                  struct ceph_osd_request *req)
507 {
508         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
509         rb_erase(&req->r_node, &osdc->requests);
510         osdc->num_requests--;
511
512         if (req->r_osd) {
513                 /* make sure the original request isn't in flight. */
514                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
515
516                 list_del_init(&req->r_osd_item);
517                 if (list_empty(&req->r_osd->o_requests))
518                         __move_osd_to_lru(osdc, req->r_osd);
519                 req->r_osd = NULL;
520         }
521
522         ceph_osdc_put_request(req);
523
524         list_del_init(&req->r_req_lru_item);
525         if (osdc->num_requests == 0) {
526                 dout(" no requests, canceling timeout\n");
527                 __cancel_osd_timeout(osdc);
528         }
529 }
530
531 /*
532  * Cancel a previously queued request message
533  */
534 static void __cancel_request(struct ceph_osd_request *req)
535 {
536         if (req->r_sent) {
537                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
538                 req->r_sent = 0;
539         }
540         list_del_init(&req->r_req_lru_item);
541 }
542
543 /*
544  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
545  * (as needed), and set the request r_osd appropriately.  If there is
546  * no up osd, set r_osd to NULL.
547  *
548  * Return 0 if unchanged, 1 if changed, or negative on error.
549  *
550  * Caller should hold map_sem for read and request_mutex.
551  */
552 static int __map_osds(struct ceph_osd_client *osdc,
553                       struct ceph_osd_request *req)
554 {
555         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
556         struct ceph_pg pgid;
557         int o = -1;
558         int err;
559
560         dout("map_osds %p tid %lld\n", req, req->r_tid);
561         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
562                                       &req->r_file_layout, osdc->osdmap);
563         if (err)
564                 return err;
565         pgid = reqhead->layout.ol_pgid;
566         req->r_pgid = pgid;
567
568         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
569
570         if ((req->r_osd && req->r_osd->o_osd == o &&
571              req->r_sent >= req->r_osd->o_incarnation) ||
572             (req->r_osd == NULL && o == -1))
573                 return 0;  /* no change */
574
575         dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
576              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
577              req->r_osd ? req->r_osd->o_osd : -1);
578
579         if (req->r_osd) {
580                 __cancel_request(req);
581                 list_del_init(&req->r_osd_item);
582                 req->r_osd = NULL;
583         }
584
585         req->r_osd = __lookup_osd(osdc, o);
586         if (!req->r_osd && o >= 0) {
587                 err = -ENOMEM;
588                 req->r_osd = create_osd(osdc);
589                 if (!req->r_osd)
590                         goto out;
591
592                 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
593                 req->r_osd->o_osd = o;
594                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
595                 __insert_osd(osdc, req->r_osd);
596
597                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
598         }
599
600         if (req->r_osd) {
601                 __remove_osd_from_lru(req->r_osd);
602                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
603         }
604         err = 1;   /* osd changed */
605
606 out:
607         return err;
608 }
609
610 /*
611  * caller should hold map_sem (for read) and request_mutex
612  */
613 static int __send_request(struct ceph_osd_client *osdc,
614                           struct ceph_osd_request *req)
615 {
616         struct ceph_osd_request_head *reqhead;
617         int err;
618
619         err = __map_osds(osdc, req);
620         if (err < 0)
621                 return err;
622         if (req->r_osd == NULL) {
623                 dout("send_request %p no up osds in pg\n", req);
624                 ceph_monc_request_next_osdmap(&osdc->client->monc);
625                 return 0;
626         }
627
628         dout("send_request %p tid %llu to osd%d flags %d\n",
629              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
630
631         reqhead = req->r_request->front.iov_base;
632         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
633         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
634         reqhead->reassert_version = req->r_reassert_version;
635
636         req->r_sent_stamp = jiffies;
637         list_move_tail(&osdc->req_lru, &req->r_req_lru_item);
638
639         ceph_msg_get(req->r_request); /* send consumes a ref */
640         ceph_con_send(&req->r_osd->o_con, req->r_request);
641         req->r_sent = req->r_osd->o_incarnation;
642         return 0;
643 }
644
645 /*
646  * Timeout callback, called every N seconds when 1 or more osd
647  * requests has been active for more than N seconds.  When this
648  * happens, we ping all OSDs with requests who have timed out to
649  * ensure any communications channel reset is detected.  Reset the
650  * request timeouts another N seconds in the future as we go.
651  * Reschedule the timeout event another N seconds in future (unless
652  * there are no open requests).
653  */
654 static void handle_timeout(struct work_struct *work)
655 {
656         struct ceph_osd_client *osdc =
657                 container_of(work, struct ceph_osd_client, timeout_work.work);
658         struct ceph_osd_request *req, *last_req = NULL;
659         struct ceph_osd *osd;
660         unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
661         unsigned long keepalive =
662                 osdc->client->mount_args->osd_keepalive_timeout * HZ;
663         unsigned long last_sent = 0;
664         struct rb_node *p;
665         struct list_head slow_osds;
666
667         dout("timeout\n");
668         down_read(&osdc->map_sem);
669
670         ceph_monc_request_next_osdmap(&osdc->client->monc);
671
672         mutex_lock(&osdc->request_mutex);
673         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
674                 req = rb_entry(p, struct ceph_osd_request, r_node);
675
676                 if (req->r_resend) {
677                         int err;
678
679                         dout("osdc resending prev failed %lld\n", req->r_tid);
680                         err = __send_request(osdc, req);
681                         if (err)
682                                 dout("osdc failed again on %lld\n", req->r_tid);
683                         else
684                                 req->r_resend = false;
685                         continue;
686                 }
687         }
688
689         /*
690          * reset osds that appear to be _really_ unresponsive.  this
691          * is a failsafe measure.. we really shouldn't be getting to
692          * this point if the system is working properly.  the monitors
693          * should mark the osd as failed and we should find out about
694          * it from an updated osd map.
695          */
696         while (!list_empty(&osdc->req_lru)) {
697                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
698                                  r_req_lru_item);
699
700                 if (time_before(jiffies, req->r_sent_stamp + timeout))
701                         break;
702
703                 BUG_ON(req == last_req && req->r_sent_stamp == last_sent);
704                 last_req = req;
705                 last_sent = req->r_sent_stamp;
706
707                 osd = req->r_osd;
708                 BUG_ON(!osd);
709                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
710                            req->r_tid, osd->o_osd);
711                 __kick_requests(osdc, osd);
712         }
713
714         /*
715          * ping osds that are a bit slow.  this ensures that if there
716          * is a break in the TCP connection we will notice, and reopen
717          * a connection with that osd (from the fault callback).
718          */
719         INIT_LIST_HEAD(&slow_osds);
720         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
721                 if (time_before(jiffies, req->r_sent_stamp + keepalive))
722                         break;
723
724                 osd = req->r_osd;
725                 BUG_ON(!osd);
726                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
727                      req->r_tid, osd->o_osd);
728                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
729         }
730         while (!list_empty(&slow_osds)) {
731                 osd = list_entry(slow_osds.next, struct ceph_osd,
732                                  o_keepalive_item);
733                 list_del_init(&osd->o_keepalive_item);
734                 ceph_con_keepalive(&osd->o_con);
735         }
736
737         __schedule_osd_timeout(osdc);
738         mutex_unlock(&osdc->request_mutex);
739
740         up_read(&osdc->map_sem);
741 }
742
743 static void handle_osds_timeout(struct work_struct *work)
744 {
745         struct ceph_osd_client *osdc =
746                 container_of(work, struct ceph_osd_client,
747                              osds_timeout_work.work);
748         unsigned long delay =
749                 osdc->client->mount_args->osd_idle_ttl * HZ >> 2;
750
751         dout("osds timeout\n");
752         down_read(&osdc->map_sem);
753         remove_old_osds(osdc, 0);
754         up_read(&osdc->map_sem);
755
756         schedule_delayed_work(&osdc->osds_timeout_work,
757                               round_jiffies_relative(delay));
758 }
759
760 /*
761  * handle osd op reply.  either call the callback if it is specified,
762  * or do the completion to wake up the waiting thread.
763  */
764 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
765                          struct ceph_connection *con)
766 {
767         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
768         struct ceph_osd_request *req;
769         u64 tid;
770         int numops, object_len, flags;
771
772         tid = le64_to_cpu(msg->hdr.tid);
773         if (msg->front.iov_len < sizeof(*rhead))
774                 goto bad;
775         numops = le32_to_cpu(rhead->num_ops);
776         object_len = le32_to_cpu(rhead->object_len);
777         if (msg->front.iov_len != sizeof(*rhead) + object_len +
778             numops * sizeof(struct ceph_osd_op))
779                 goto bad;
780         dout("handle_reply %p tid %llu\n", msg, tid);
781
782         /* lookup */
783         mutex_lock(&osdc->request_mutex);
784         req = __lookup_request(osdc, tid);
785         if (req == NULL) {
786                 dout("handle_reply tid %llu dne\n", tid);
787                 mutex_unlock(&osdc->request_mutex);
788                 return;
789         }
790         ceph_osdc_get_request(req);
791         flags = le32_to_cpu(rhead->flags);
792
793         /*
794          * if this connection filled our message, drop our reference now, to
795          * avoid a (safe but slower) revoke later.
796          */
797         if (req->r_con_filling_msg == con && req->r_reply == msg) {
798                 dout(" dropping con_filling_msg ref %p\n", con);
799                 req->r_con_filling_msg = NULL;
800                 ceph_con_put(con);
801         }
802
803         if (!req->r_got_reply) {
804                 unsigned bytes;
805
806                 req->r_result = le32_to_cpu(rhead->result);
807                 bytes = le32_to_cpu(msg->hdr.data_len);
808                 dout("handle_reply result %d bytes %d\n", req->r_result,
809                      bytes);
810                 if (req->r_result == 0)
811                         req->r_result = bytes;
812
813                 /* in case this is a write and we need to replay, */
814                 req->r_reassert_version = rhead->reassert_version;
815
816                 req->r_got_reply = 1;
817         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
818                 dout("handle_reply tid %llu dup ack\n", tid);
819                 mutex_unlock(&osdc->request_mutex);
820                 goto done;
821         }
822
823         dout("handle_reply tid %llu flags %d\n", tid, flags);
824
825         /* either this is a read, or we got the safe response */
826         if ((flags & CEPH_OSD_FLAG_ONDISK) ||
827             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
828                 __unregister_request(osdc, req);
829
830         mutex_unlock(&osdc->request_mutex);
831
832         if (req->r_callback)
833                 req->r_callback(req, msg);
834         else
835                 complete(&req->r_completion);
836
837         if (flags & CEPH_OSD_FLAG_ONDISK) {
838                 if (req->r_safe_callback)
839                         req->r_safe_callback(req, msg);
840                 complete(&req->r_safe_completion);  /* fsync waiter */
841         }
842
843 done:
844         ceph_osdc_put_request(req);
845         return;
846
847 bad:
848         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
849                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
850                (int)sizeof(*rhead));
851         ceph_msg_dump(msg);
852 }
853
854
855 static int __kick_requests(struct ceph_osd_client *osdc,
856                           struct ceph_osd *kickosd)
857 {
858         struct ceph_osd_request *req;
859         struct rb_node *p, *n;
860         int needmap = 0;
861         int err;
862
863         dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
864         if (kickosd) {
865                 __reset_osd(osdc, kickosd);
866         } else {
867                 for (p = rb_first(&osdc->osds); p; p = n) {
868                         struct ceph_osd *osd =
869                                 rb_entry(p, struct ceph_osd, o_node);
870
871                         n = rb_next(p);
872                         if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
873                             memcmp(&osd->o_con.peer_addr,
874                                    ceph_osd_addr(osdc->osdmap,
875                                                  osd->o_osd),
876                                    sizeof(struct ceph_entity_addr)) != 0)
877                                 __reset_osd(osdc, osd);
878                 }
879         }
880
881         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
882                 req = rb_entry(p, struct ceph_osd_request, r_node);
883
884                 if (req->r_resend) {
885                         dout(" r_resend set on tid %llu\n", req->r_tid);
886                         __cancel_request(req);
887                         goto kick;
888                 }
889                 if (req->r_osd && kickosd == req->r_osd) {
890                         __cancel_request(req);
891                         goto kick;
892                 }
893
894                 err = __map_osds(osdc, req);
895                 if (err == 0)
896                         continue;  /* no change */
897                 if (err < 0) {
898                         /*
899                          * FIXME: really, we should set the request
900                          * error and fail if this isn't a 'nofail'
901                          * request, but that's a fair bit more
902                          * complicated to do.  So retry!
903                          */
904                         dout(" setting r_resend on %llu\n", req->r_tid);
905                         req->r_resend = true;
906                         continue;
907                 }
908                 if (req->r_osd == NULL) {
909                         dout("tid %llu maps to no valid osd\n", req->r_tid);
910                         needmap++;  /* request a newer map */
911                         continue;
912                 }
913
914 kick:
915                 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
916                      req->r_osd->o_osd);
917                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
918                 err = __send_request(osdc, req);
919                 if (err) {
920                         dout(" setting r_resend on %llu\n", req->r_tid);
921                         req->r_resend = true;
922                 }
923         }
924
925         return needmap;
926 }
927
928 /*
929  * Resubmit osd requests whose osd or osd address has changed.  Request
930  * a new osd map if osds are down, or we are otherwise unable to determine
931  * how to direct a request.
932  *
933  * Close connections to down osds.
934  *
935  * If @who is specified, resubmit requests for that specific osd.
936  *
937  * Caller should hold map_sem for read and request_mutex.
938  */
939 static void kick_requests(struct ceph_osd_client *osdc,
940                           struct ceph_osd *kickosd)
941 {
942         int needmap;
943
944         mutex_lock(&osdc->request_mutex);
945         needmap = __kick_requests(osdc, kickosd);
946         mutex_unlock(&osdc->request_mutex);
947
948         if (needmap) {
949                 dout("%d requests for down osds, need new map\n", needmap);
950                 ceph_monc_request_next_osdmap(&osdc->client->monc);
951         }
952
953 }
954 /*
955  * Process updated osd map.
956  *
957  * The message contains any number of incremental and full maps, normally
958  * indicating some sort of topology change in the cluster.  Kick requests
959  * off to different OSDs as needed.
960  */
961 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
962 {
963         void *p, *end, *next;
964         u32 nr_maps, maplen;
965         u32 epoch;
966         struct ceph_osdmap *newmap = NULL, *oldmap;
967         int err;
968         struct ceph_fsid fsid;
969
970         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
971         p = msg->front.iov_base;
972         end = p + msg->front.iov_len;
973
974         /* verify fsid */
975         ceph_decode_need(&p, end, sizeof(fsid), bad);
976         ceph_decode_copy(&p, &fsid, sizeof(fsid));
977         if (ceph_check_fsid(osdc->client, &fsid) < 0)
978                 return;
979
980         down_write(&osdc->map_sem);
981
982         /* incremental maps */
983         ceph_decode_32_safe(&p, end, nr_maps, bad);
984         dout(" %d inc maps\n", nr_maps);
985         while (nr_maps > 0) {
986                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
987                 epoch = ceph_decode_32(&p);
988                 maplen = ceph_decode_32(&p);
989                 ceph_decode_need(&p, end, maplen, bad);
990                 next = p + maplen;
991                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
992                         dout("applying incremental map %u len %d\n",
993                              epoch, maplen);
994                         newmap = osdmap_apply_incremental(&p, next,
995                                                           osdc->osdmap,
996                                                           osdc->client->msgr);
997                         if (IS_ERR(newmap)) {
998                                 err = PTR_ERR(newmap);
999                                 goto bad;
1000                         }
1001                         BUG_ON(!newmap);
1002                         if (newmap != osdc->osdmap) {
1003                                 ceph_osdmap_destroy(osdc->osdmap);
1004                                 osdc->osdmap = newmap;
1005                         }
1006                 } else {
1007                         dout("ignoring incremental map %u len %d\n",
1008                              epoch, maplen);
1009                 }
1010                 p = next;
1011                 nr_maps--;
1012         }
1013         if (newmap)
1014                 goto done;
1015
1016         /* full maps */
1017         ceph_decode_32_safe(&p, end, nr_maps, bad);
1018         dout(" %d full maps\n", nr_maps);
1019         while (nr_maps) {
1020                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1021                 epoch = ceph_decode_32(&p);
1022                 maplen = ceph_decode_32(&p);
1023                 ceph_decode_need(&p, end, maplen, bad);
1024                 if (nr_maps > 1) {
1025                         dout("skipping non-latest full map %u len %d\n",
1026                              epoch, maplen);
1027                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1028                         dout("skipping full map %u len %d, "
1029                              "older than our %u\n", epoch, maplen,
1030                              osdc->osdmap->epoch);
1031                 } else {
1032                         dout("taking full map %u len %d\n", epoch, maplen);
1033                         newmap = osdmap_decode(&p, p+maplen);
1034                         if (IS_ERR(newmap)) {
1035                                 err = PTR_ERR(newmap);
1036                                 goto bad;
1037                         }
1038                         BUG_ON(!newmap);
1039                         oldmap = osdc->osdmap;
1040                         osdc->osdmap = newmap;
1041                         if (oldmap)
1042                                 ceph_osdmap_destroy(oldmap);
1043                 }
1044                 p += maplen;
1045                 nr_maps--;
1046         }
1047
1048 done:
1049         downgrade_write(&osdc->map_sem);
1050         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1051         if (newmap)
1052                 kick_requests(osdc, NULL);
1053         up_read(&osdc->map_sem);
1054         return;
1055
1056 bad:
1057         pr_err("osdc handle_map corrupt msg\n");
1058         ceph_msg_dump(msg);
1059         up_write(&osdc->map_sem);
1060         return;
1061 }
1062
1063
1064 /*
1065  * A read request prepares specific pages that data is to be read into.
1066  * When a message is being read off the wire, we call prepare_pages to
1067  * find those pages.
1068  *  0 = success, -1 failure.
1069  */
1070 static int __prepare_pages(struct ceph_connection *con,
1071                          struct ceph_msg_header *hdr,
1072                          struct ceph_osd_request *req,
1073                          u64 tid,
1074                          struct ceph_msg *m)
1075 {
1076         struct ceph_osd *osd = con->private;
1077         struct ceph_osd_client *osdc;
1078         int ret = -1;
1079         int data_len = le32_to_cpu(hdr->data_len);
1080         unsigned data_off = le16_to_cpu(hdr->data_off);
1081
1082         int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
1083
1084         if (!osd)
1085                 return -1;
1086
1087         osdc = osd->o_osdc;
1088
1089         dout("__prepare_pages on msg %p tid %llu, has %d pages, want %d\n", m,
1090              tid, req->r_num_pages, want);
1091         if (unlikely(req->r_num_pages < want))
1092                 goto out;
1093         m->pages = req->r_pages;
1094         m->nr_pages = req->r_num_pages;
1095         ret = 0; /* success */
1096 out:
1097         BUG_ON(ret < 0 || m->nr_pages < want);
1098
1099         return ret;
1100 }
1101
1102 /*
1103  * Register request, send initial attempt.
1104  */
1105 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1106                             struct ceph_osd_request *req,
1107                             bool nofail)
1108 {
1109         int rc = 0;
1110
1111         req->r_request->pages = req->r_pages;
1112         req->r_request->nr_pages = req->r_num_pages;
1113
1114         register_request(osdc, req);
1115
1116         down_read(&osdc->map_sem);
1117         mutex_lock(&osdc->request_mutex);
1118         /*
1119          * a racing kick_requests() may have sent the message for us
1120          * while we dropped request_mutex above, so only send now if
1121          * the request still han't been touched yet.
1122          */
1123         if (req->r_sent == 0) {
1124                 rc = __send_request(osdc, req);
1125                 if (rc) {
1126                         if (nofail) {
1127                                 dout("osdc_start_request failed send, "
1128                                      " marking %lld\n", req->r_tid);
1129                                 req->r_resend = true;
1130                                 rc = 0;
1131                         } else {
1132                                 __unregister_request(osdc, req);
1133                         }
1134                 }
1135         }
1136         mutex_unlock(&osdc->request_mutex);
1137         up_read(&osdc->map_sem);
1138         return rc;
1139 }
1140
1141 /*
1142  * wait for a request to complete
1143  */
1144 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1145                            struct ceph_osd_request *req)
1146 {
1147         int rc;
1148
1149         rc = wait_for_completion_interruptible(&req->r_completion);
1150         if (rc < 0) {
1151                 mutex_lock(&osdc->request_mutex);
1152                 __cancel_request(req);
1153                 __unregister_request(osdc, req);
1154                 mutex_unlock(&osdc->request_mutex);
1155                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1156                 return rc;
1157         }
1158
1159         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1160         return req->r_result;
1161 }
1162
1163 /*
1164  * sync - wait for all in-flight requests to flush.  avoid starvation.
1165  */
1166 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1167 {
1168         struct ceph_osd_request *req;
1169         u64 last_tid, next_tid = 0;
1170
1171         mutex_lock(&osdc->request_mutex);
1172         last_tid = osdc->last_tid;
1173         while (1) {
1174                 req = __lookup_request_ge(osdc, next_tid);
1175                 if (!req)
1176                         break;
1177                 if (req->r_tid > last_tid)
1178                         break;
1179
1180                 next_tid = req->r_tid + 1;
1181                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1182                         continue;
1183
1184                 ceph_osdc_get_request(req);
1185                 mutex_unlock(&osdc->request_mutex);
1186                 dout("sync waiting on tid %llu (last is %llu)\n",
1187                      req->r_tid, last_tid);
1188                 wait_for_completion(&req->r_safe_completion);
1189                 mutex_lock(&osdc->request_mutex);
1190                 ceph_osdc_put_request(req);
1191         }
1192         mutex_unlock(&osdc->request_mutex);
1193         dout("sync done (thru tid %llu)\n", last_tid);
1194 }
1195
1196 /*
1197  * init, shutdown
1198  */
1199 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1200 {
1201         int err;
1202
1203         dout("init\n");
1204         osdc->client = client;
1205         osdc->osdmap = NULL;
1206         init_rwsem(&osdc->map_sem);
1207         init_completion(&osdc->map_waiters);
1208         osdc->last_requested_map = 0;
1209         mutex_init(&osdc->request_mutex);
1210         osdc->last_tid = 0;
1211         osdc->osds = RB_ROOT;
1212         INIT_LIST_HEAD(&osdc->osd_lru);
1213         osdc->requests = RB_ROOT;
1214         INIT_LIST_HEAD(&osdc->req_lru);
1215         osdc->num_requests = 0;
1216         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1217         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1218
1219         schedule_delayed_work(&osdc->osds_timeout_work,
1220            round_jiffies_relative(osdc->client->mount_args->osd_idle_ttl * HZ));
1221
1222         err = -ENOMEM;
1223         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1224                                         sizeof(struct ceph_osd_request));
1225         if (!osdc->req_mempool)
1226                 goto out;
1227
1228         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true);
1229         if (err < 0)
1230                 goto out_mempool;
1231         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1232                                 OSD_OPREPLY_FRONT_LEN, 10, true);
1233         if (err < 0)
1234                 goto out_msgpool;
1235         return 0;
1236
1237 out_msgpool:
1238         ceph_msgpool_destroy(&osdc->msgpool_op);
1239 out_mempool:
1240         mempool_destroy(osdc->req_mempool);
1241 out:
1242         return err;
1243 }
1244
1245 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1246 {
1247         cancel_delayed_work_sync(&osdc->timeout_work);
1248         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1249         if (osdc->osdmap) {
1250                 ceph_osdmap_destroy(osdc->osdmap);
1251                 osdc->osdmap = NULL;
1252         }
1253         remove_old_osds(osdc, 1);
1254         mempool_destroy(osdc->req_mempool);
1255         ceph_msgpool_destroy(&osdc->msgpool_op);
1256         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1257 }
1258
1259 /*
1260  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1261  * *plen.  Return number of bytes read, or error.
1262  */
1263 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1264                         struct ceph_vino vino, struct ceph_file_layout *layout,
1265                         u64 off, u64 *plen,
1266                         u32 truncate_seq, u64 truncate_size,
1267                         struct page **pages, int num_pages)
1268 {
1269         struct ceph_osd_request *req;
1270         int rc = 0;
1271
1272         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1273              vino.snap, off, *plen);
1274         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1275                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1276                                     NULL, 0, truncate_seq, truncate_size, NULL,
1277                                     false, 1);
1278         if (IS_ERR(req))
1279                 return PTR_ERR(req);
1280
1281         /* it may be a short read due to an object boundary */
1282         req->r_pages = pages;
1283         num_pages = calc_pages_for(off, *plen);
1284         req->r_num_pages = num_pages;
1285
1286         dout("readpages  final extent is %llu~%llu (%d pages)\n",
1287              off, *plen, req->r_num_pages);
1288
1289         rc = ceph_osdc_start_request(osdc, req, false);
1290         if (!rc)
1291                 rc = ceph_osdc_wait_request(osdc, req);
1292
1293         ceph_osdc_put_request(req);
1294         dout("readpages result %d\n", rc);
1295         return rc;
1296 }
1297
1298 /*
1299  * do a synchronous write on N pages
1300  */
1301 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1302                          struct ceph_file_layout *layout,
1303                          struct ceph_snap_context *snapc,
1304                          u64 off, u64 len,
1305                          u32 truncate_seq, u64 truncate_size,
1306                          struct timespec *mtime,
1307                          struct page **pages, int num_pages,
1308                          int flags, int do_sync, bool nofail)
1309 {
1310         struct ceph_osd_request *req;
1311         int rc = 0;
1312
1313         BUG_ON(vino.snap != CEPH_NOSNAP);
1314         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1315                                     CEPH_OSD_OP_WRITE,
1316                                     flags | CEPH_OSD_FLAG_ONDISK |
1317                                             CEPH_OSD_FLAG_WRITE,
1318                                     snapc, do_sync,
1319                                     truncate_seq, truncate_size, mtime,
1320                                     nofail, 1);
1321         if (IS_ERR(req))
1322                 return PTR_ERR(req);
1323
1324         /* it may be a short write due to an object boundary */
1325         req->r_pages = pages;
1326         req->r_num_pages = calc_pages_for(off, len);
1327         dout("writepages %llu~%llu (%d pages)\n", off, len,
1328              req->r_num_pages);
1329
1330         rc = ceph_osdc_start_request(osdc, req, nofail);
1331         if (!rc)
1332                 rc = ceph_osdc_wait_request(osdc, req);
1333
1334         ceph_osdc_put_request(req);
1335         if (rc == 0)
1336                 rc = len;
1337         dout("writepages result %d\n", rc);
1338         return rc;
1339 }
1340
1341 /*
1342  * handle incoming message
1343  */
1344 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1345 {
1346         struct ceph_osd *osd = con->private;
1347         struct ceph_osd_client *osdc;
1348         int type = le16_to_cpu(msg->hdr.type);
1349
1350         if (!osd)
1351                 return;
1352         osdc = osd->o_osdc;
1353
1354         switch (type) {
1355         case CEPH_MSG_OSD_MAP:
1356                 ceph_osdc_handle_map(osdc, msg);
1357                 break;
1358         case CEPH_MSG_OSD_OPREPLY:
1359                 handle_reply(osdc, msg, con);
1360                 break;
1361
1362         default:
1363                 pr_err("received unknown message type %d %s\n", type,
1364                        ceph_msg_type_name(type));
1365         }
1366         ceph_msg_put(msg);
1367 }
1368
1369 /*
1370  * lookup and return message for incoming reply
1371  */
1372 static struct ceph_msg *get_reply(struct ceph_connection *con,
1373                                   struct ceph_msg_header *hdr,
1374                                   int *skip)
1375 {
1376         struct ceph_osd *osd = con->private;
1377         struct ceph_osd_client *osdc = osd->o_osdc;
1378         struct ceph_msg *m;
1379         struct ceph_osd_request *req;
1380         int front = le32_to_cpu(hdr->front_len);
1381         int data_len = le32_to_cpu(hdr->data_len);
1382         u64 tid;
1383         int err;
1384
1385         tid = le64_to_cpu(hdr->tid);
1386         mutex_lock(&osdc->request_mutex);
1387         req = __lookup_request(osdc, tid);
1388         if (!req) {
1389                 *skip = 1;
1390                 m = NULL;
1391                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1392                         osd->o_osd);
1393                 goto out;
1394         }
1395
1396         if (req->r_con_filling_msg) {
1397                 dout("get_reply revoking msg %p from old con %p\n",
1398                      req->r_reply, req->r_con_filling_msg);
1399                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1400                 ceph_con_put(req->r_con_filling_msg);
1401         }
1402
1403         if (front > req->r_reply->front.iov_len) {
1404                 pr_warning("get_reply front %d > preallocated %d\n",
1405                            front, (int)req->r_reply->front.iov_len);
1406                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, 0, 0, NULL);
1407                 if (IS_ERR(m))
1408                         goto out;
1409                 ceph_msg_put(req->r_reply);
1410                 req->r_reply = m;
1411         }
1412         m = ceph_msg_get(req->r_reply);
1413
1414         if (data_len > 0) {
1415                 err = __prepare_pages(con, hdr, req, tid, m);
1416                 if (err < 0) {
1417                         *skip = 1;
1418                         ceph_msg_put(m);
1419                         m = ERR_PTR(err);
1420                 }
1421         }
1422         *skip = 0;
1423         req->r_con_filling_msg = ceph_con_get(con);
1424         dout("get_reply tid %lld %p\n", tid, m);
1425
1426 out:
1427         mutex_unlock(&osdc->request_mutex);
1428         return m;
1429
1430 }
1431
1432 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1433                                   struct ceph_msg_header *hdr,
1434                                   int *skip)
1435 {
1436         struct ceph_osd *osd = con->private;
1437         int type = le16_to_cpu(hdr->type);
1438         int front = le32_to_cpu(hdr->front_len);
1439
1440         switch (type) {
1441         case CEPH_MSG_OSD_MAP:
1442                 return ceph_msg_new(type, front, 0, 0, NULL);
1443         case CEPH_MSG_OSD_OPREPLY:
1444                 return get_reply(con, hdr, skip);
1445         default:
1446                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
1447                         osd->o_osd);
1448                 *skip = 1;
1449                 return NULL;
1450         }
1451 }
1452
1453 /*
1454  * Wrappers to refcount containing ceph_osd struct
1455  */
1456 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1457 {
1458         struct ceph_osd *osd = con->private;
1459         if (get_osd(osd))
1460                 return con;
1461         return NULL;
1462 }
1463
1464 static void put_osd_con(struct ceph_connection *con)
1465 {
1466         struct ceph_osd *osd = con->private;
1467         put_osd(osd);
1468 }
1469
1470 /*
1471  * authentication
1472  */
1473 static int get_authorizer(struct ceph_connection *con,
1474                           void **buf, int *len, int *proto,
1475                           void **reply_buf, int *reply_len, int force_new)
1476 {
1477         struct ceph_osd *o = con->private;
1478         struct ceph_osd_client *osdc = o->o_osdc;
1479         struct ceph_auth_client *ac = osdc->client->monc.auth;
1480         int ret = 0;
1481
1482         if (force_new && o->o_authorizer) {
1483                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1484                 o->o_authorizer = NULL;
1485         }
1486         if (o->o_authorizer == NULL) {
1487                 ret = ac->ops->create_authorizer(
1488                         ac, CEPH_ENTITY_TYPE_OSD,
1489                         &o->o_authorizer,
1490                         &o->o_authorizer_buf,
1491                         &o->o_authorizer_buf_len,
1492                         &o->o_authorizer_reply_buf,
1493                         &o->o_authorizer_reply_buf_len);
1494                 if (ret)
1495                 return ret;
1496         }
1497
1498         *proto = ac->protocol;
1499         *buf = o->o_authorizer_buf;
1500         *len = o->o_authorizer_buf_len;
1501         *reply_buf = o->o_authorizer_reply_buf;
1502         *reply_len = o->o_authorizer_reply_buf_len;
1503         return 0;
1504 }
1505
1506
1507 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1508 {
1509         struct ceph_osd *o = con->private;
1510         struct ceph_osd_client *osdc = o->o_osdc;
1511         struct ceph_auth_client *ac = osdc->client->monc.auth;
1512
1513         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1514 }
1515
1516 static int invalidate_authorizer(struct ceph_connection *con)
1517 {
1518         struct ceph_osd *o = con->private;
1519         struct ceph_osd_client *osdc = o->o_osdc;
1520         struct ceph_auth_client *ac = osdc->client->monc.auth;
1521
1522         if (ac->ops->invalidate_authorizer)
1523                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
1524
1525         return ceph_monc_validate_auth(&osdc->client->monc);
1526 }
1527
1528 const static struct ceph_connection_operations osd_con_ops = {
1529         .get = get_osd_con,
1530         .put = put_osd_con,
1531         .dispatch = dispatch,
1532         .get_authorizer = get_authorizer,
1533         .verify_authorizer_reply = verify_authorizer_reply,
1534         .invalidate_authorizer = invalidate_authorizer,
1535         .alloc_msg = alloc_msg,
1536         .fault = osd_reset,
1537 };