02212ed50852eaa41b5d0c75c7f121b77f074ce3
[linux-2.6.git] / net / ceph / osd_client.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/err.h>
5 #include <linux/highmem.h>
6 #include <linux/mm.h>
7 #include <linux/pagemap.h>
8 #include <linux/slab.h>
9 #include <linux/uaccess.h>
10 #ifdef CONFIG_BLOCK
11 #include <linux/bio.h>
12 #endif
13
14 #include <linux/ceph/libceph.h>
15 #include <linux/ceph/osd_client.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/decode.h>
18 #include <linux/ceph/auth.h>
19 #include <linux/ceph/pagelist.h>
20
21 #define OSD_OP_FRONT_LEN        4096
22 #define OSD_OPREPLY_FRONT_LEN   512
23
24 static const struct ceph_connection_operations osd_con_ops;
25
26 static void send_queued(struct ceph_osd_client *osdc);
27 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
28 static void __register_request(struct ceph_osd_client *osdc,
29                                struct ceph_osd_request *req);
30 static void __unregister_linger_request(struct ceph_osd_client *osdc,
31                                         struct ceph_osd_request *req);
32 static int __send_request(struct ceph_osd_client *osdc,
33                           struct ceph_osd_request *req);
34
35 static int op_needs_trail(int op)
36 {
37         switch (op) {
38         case CEPH_OSD_OP_GETXATTR:
39         case CEPH_OSD_OP_SETXATTR:
40         case CEPH_OSD_OP_CMPXATTR:
41         case CEPH_OSD_OP_CALL:
42         case CEPH_OSD_OP_NOTIFY:
43                 return 1;
44         default:
45                 return 0;
46         }
47 }
48
49 static int op_has_extent(int op)
50 {
51         return (op == CEPH_OSD_OP_READ ||
52                 op == CEPH_OSD_OP_WRITE);
53 }
54
55 void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
56                         struct ceph_file_layout *layout,
57                         u64 snapid,
58                         u64 off, u64 *plen, u64 *bno,
59                         struct ceph_osd_request *req,
60                         struct ceph_osd_req_op *op)
61 {
62         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
63         u64 orig_len = *plen;
64         u64 objoff, objlen;    /* extent in object */
65
66         reqhead->snapid = cpu_to_le64(snapid);
67
68         /* object extent? */
69         ceph_calc_file_object_mapping(layout, off, plen, bno,
70                                       &objoff, &objlen);
71         if (*plen < orig_len)
72                 dout(" skipping last %llu, final file extent %llu~%llu\n",
73                      orig_len - *plen, off, *plen);
74
75         if (op_has_extent(op->op)) {
76                 op->extent.offset = objoff;
77                 op->extent.length = objlen;
78         }
79         req->r_num_pages = calc_pages_for(off, *plen);
80         req->r_page_alignment = off & ~PAGE_MASK;
81         if (op->op == CEPH_OSD_OP_WRITE)
82                 op->payload_len = *plen;
83
84         dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
85              *bno, objoff, objlen, req->r_num_pages);
86
87 }
88 EXPORT_SYMBOL(ceph_calc_raw_layout);
89
90 /*
91  * Implement client access to distributed object storage cluster.
92  *
93  * All data objects are stored within a cluster/cloud of OSDs, or
94  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
95  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
96  * remote daemons serving up and coordinating consistent and safe
97  * access to storage.
98  *
99  * Cluster membership and the mapping of data objects onto storage devices
100  * are described by the osd map.
101  *
102  * We keep track of pending OSD requests (read, write), resubmit
103  * requests to different OSDs when the cluster topology/data layout
104  * change, or retry the affected requests when the communications
105  * channel with an OSD is reset.
106  */
107
108 /*
109  * calculate the mapping of a file extent onto an object, and fill out the
110  * request accordingly.  shorten extent as necessary if it crosses an
111  * object boundary.
112  *
113  * fill osd op in request message.
114  */
115 static void calc_layout(struct ceph_osd_client *osdc,
116                         struct ceph_vino vino,
117                         struct ceph_file_layout *layout,
118                         u64 off, u64 *plen,
119                         struct ceph_osd_request *req,
120                         struct ceph_osd_req_op *op)
121 {
122         u64 bno;
123
124         ceph_calc_raw_layout(osdc, layout, vino.snap, off,
125                              plen, &bno, req, op);
126
127         sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
128         req->r_oid_len = strlen(req->r_oid);
129 }
130
131 /*
132  * requests
133  */
134 void ceph_osdc_release_request(struct kref *kref)
135 {
136         struct ceph_osd_request *req = container_of(kref,
137                                                     struct ceph_osd_request,
138                                                     r_kref);
139
140         if (req->r_request)
141                 ceph_msg_put(req->r_request);
142         if (req->r_reply)
143                 ceph_msg_put(req->r_reply);
144         if (req->r_con_filling_msg) {
145                 dout("release_request revoking pages %p from con %p\n",
146                      req->r_pages, req->r_con_filling_msg);
147                 ceph_con_revoke_message(req->r_con_filling_msg,
148                                       req->r_reply);
149                 ceph_con_put(req->r_con_filling_msg);
150         }
151         if (req->r_own_pages)
152                 ceph_release_page_vector(req->r_pages,
153                                          req->r_num_pages);
154 #ifdef CONFIG_BLOCK
155         if (req->r_bio)
156                 bio_put(req->r_bio);
157 #endif
158         ceph_put_snap_context(req->r_snapc);
159         if (req->r_trail) {
160                 ceph_pagelist_release(req->r_trail);
161                 kfree(req->r_trail);
162         }
163         if (req->r_mempool)
164                 mempool_free(req, req->r_osdc->req_mempool);
165         else
166                 kfree(req);
167 }
168 EXPORT_SYMBOL(ceph_osdc_release_request);
169
170 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
171 {
172         int i = 0;
173
174         if (needs_trail)
175                 *needs_trail = 0;
176         while (ops[i].op) {
177                 if (needs_trail && op_needs_trail(ops[i].op))
178                         *needs_trail = 1;
179                 i++;
180         }
181
182         return i;
183 }
184
185 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
186                                                int flags,
187                                                struct ceph_snap_context *snapc,
188                                                struct ceph_osd_req_op *ops,
189                                                bool use_mempool,
190                                                gfp_t gfp_flags,
191                                                struct page **pages,
192                                                struct bio *bio)
193 {
194         struct ceph_osd_request *req;
195         struct ceph_msg *msg;
196         int needs_trail;
197         int num_op = get_num_ops(ops, &needs_trail);
198         size_t msg_size = sizeof(struct ceph_osd_request_head);
199
200         msg_size += num_op*sizeof(struct ceph_osd_op);
201
202         if (use_mempool) {
203                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
204                 memset(req, 0, sizeof(*req));
205         } else {
206                 req = kzalloc(sizeof(*req), gfp_flags);
207         }
208         if (req == NULL)
209                 return NULL;
210
211         req->r_osdc = osdc;
212         req->r_mempool = use_mempool;
213
214         kref_init(&req->r_kref);
215         init_completion(&req->r_completion);
216         init_completion(&req->r_safe_completion);
217         INIT_LIST_HEAD(&req->r_unsafe_item);
218         INIT_LIST_HEAD(&req->r_linger_item);
219         INIT_LIST_HEAD(&req->r_linger_osd);
220         req->r_flags = flags;
221
222         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
223
224         /* create reply message */
225         if (use_mempool)
226                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
227         else
228                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
229                                    OSD_OPREPLY_FRONT_LEN, gfp_flags);
230         if (!msg) {
231                 ceph_osdc_put_request(req);
232                 return NULL;
233         }
234         req->r_reply = msg;
235
236         /* allocate space for the trailing data */
237         if (needs_trail) {
238                 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
239                 if (!req->r_trail) {
240                         ceph_osdc_put_request(req);
241                         return NULL;
242                 }
243                 ceph_pagelist_init(req->r_trail);
244         }
245         /* create request message; allow space for oid */
246         msg_size += 40;
247         if (snapc)
248                 msg_size += sizeof(u64) * snapc->num_snaps;
249         if (use_mempool)
250                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
251         else
252                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
253         if (!msg) {
254                 ceph_osdc_put_request(req);
255                 return NULL;
256         }
257
258         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
259         memset(msg->front.iov_base, 0, msg->front.iov_len);
260
261         req->r_request = msg;
262         req->r_pages = pages;
263 #ifdef CONFIG_BLOCK
264         if (bio) {
265                 req->r_bio = bio;
266                 bio_get(req->r_bio);
267         }
268 #endif
269
270         return req;
271 }
272 EXPORT_SYMBOL(ceph_osdc_alloc_request);
273
274 static void osd_req_encode_op(struct ceph_osd_request *req,
275                               struct ceph_osd_op *dst,
276                               struct ceph_osd_req_op *src)
277 {
278         dst->op = cpu_to_le16(src->op);
279
280         switch (dst->op) {
281         case CEPH_OSD_OP_READ:
282         case CEPH_OSD_OP_WRITE:
283                 dst->extent.offset =
284                         cpu_to_le64(src->extent.offset);
285                 dst->extent.length =
286                         cpu_to_le64(src->extent.length);
287                 dst->extent.truncate_size =
288                         cpu_to_le64(src->extent.truncate_size);
289                 dst->extent.truncate_seq =
290                         cpu_to_le32(src->extent.truncate_seq);
291                 break;
292
293         case CEPH_OSD_OP_GETXATTR:
294         case CEPH_OSD_OP_SETXATTR:
295         case CEPH_OSD_OP_CMPXATTR:
296                 BUG_ON(!req->r_trail);
297
298                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
299                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
300                 dst->xattr.cmp_op = src->xattr.cmp_op;
301                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
302                 ceph_pagelist_append(req->r_trail, src->xattr.name,
303                                      src->xattr.name_len);
304                 ceph_pagelist_append(req->r_trail, src->xattr.val,
305                                      src->xattr.value_len);
306                 break;
307         case CEPH_OSD_OP_CALL:
308                 BUG_ON(!req->r_trail);
309
310                 dst->cls.class_len = src->cls.class_len;
311                 dst->cls.method_len = src->cls.method_len;
312                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
313
314                 ceph_pagelist_append(req->r_trail, src->cls.class_name,
315                                      src->cls.class_len);
316                 ceph_pagelist_append(req->r_trail, src->cls.method_name,
317                                      src->cls.method_len);
318                 ceph_pagelist_append(req->r_trail, src->cls.indata,
319                                      src->cls.indata_len);
320                 break;
321         case CEPH_OSD_OP_ROLLBACK:
322                 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
323                 break;
324         case CEPH_OSD_OP_STARTSYNC:
325                 break;
326         case CEPH_OSD_OP_NOTIFY:
327                 {
328                         __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
329                         __le32 timeout = cpu_to_le32(src->watch.timeout);
330
331                         BUG_ON(!req->r_trail);
332
333                         ceph_pagelist_append(req->r_trail,
334                                                 &prot_ver, sizeof(prot_ver));
335                         ceph_pagelist_append(req->r_trail,
336                                                 &timeout, sizeof(timeout));
337                 }
338         case CEPH_OSD_OP_NOTIFY_ACK:
339         case CEPH_OSD_OP_WATCH:
340                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
341                 dst->watch.ver = cpu_to_le64(src->watch.ver);
342                 dst->watch.flag = src->watch.flag;
343                 break;
344         default:
345                 pr_err("unrecognized osd opcode %d\n", dst->op);
346                 WARN_ON(1);
347                 break;
348         }
349         dst->payload_len = cpu_to_le32(src->payload_len);
350 }
351
352 /*
353  * build new request AND message
354  *
355  */
356 void ceph_osdc_build_request(struct ceph_osd_request *req,
357                              u64 off, u64 *plen,
358                              struct ceph_osd_req_op *src_ops,
359                              struct ceph_snap_context *snapc,
360                              struct timespec *mtime,
361                              const char *oid,
362                              int oid_len)
363 {
364         struct ceph_msg *msg = req->r_request;
365         struct ceph_osd_request_head *head;
366         struct ceph_osd_req_op *src_op;
367         struct ceph_osd_op *op;
368         void *p;
369         int num_op = get_num_ops(src_ops, NULL);
370         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
371         int flags = req->r_flags;
372         u64 data_len = 0;
373         int i;
374
375         head = msg->front.iov_base;
376         op = (void *)(head + 1);
377         p = (void *)(op + num_op);
378
379         req->r_snapc = ceph_get_snap_context(snapc);
380
381         head->client_inc = cpu_to_le32(1); /* always, for now. */
382         head->flags = cpu_to_le32(flags);
383         if (flags & CEPH_OSD_FLAG_WRITE)
384                 ceph_encode_timespec(&head->mtime, mtime);
385         head->num_ops = cpu_to_le16(num_op);
386
387
388         /* fill in oid */
389         head->object_len = cpu_to_le32(oid_len);
390         memcpy(p, oid, oid_len);
391         p += oid_len;
392
393         src_op = src_ops;
394         while (src_op->op) {
395                 osd_req_encode_op(req, op, src_op);
396                 src_op++;
397                 op++;
398         }
399
400         if (req->r_trail)
401                 data_len += req->r_trail->length;
402
403         if (snapc) {
404                 head->snap_seq = cpu_to_le64(snapc->seq);
405                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
406                 for (i = 0; i < snapc->num_snaps; i++) {
407                         put_unaligned_le64(snapc->snaps[i], p);
408                         p += sizeof(u64);
409                 }
410         }
411
412         if (flags & CEPH_OSD_FLAG_WRITE) {
413                 req->r_request->hdr.data_off = cpu_to_le16(off);
414                 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
415         } else if (data_len) {
416                 req->r_request->hdr.data_off = 0;
417                 req->r_request->hdr.data_len = cpu_to_le32(data_len);
418         }
419
420         req->r_request->page_alignment = req->r_page_alignment;
421
422         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
423         msg_size = p - msg->front.iov_base;
424         msg->front.iov_len = msg_size;
425         msg->hdr.front_len = cpu_to_le32(msg_size);
426         return;
427 }
428 EXPORT_SYMBOL(ceph_osdc_build_request);
429
430 /*
431  * build new request AND message, calculate layout, and adjust file
432  * extent as needed.
433  *
434  * if the file was recently truncated, we include information about its
435  * old and new size so that the object can be updated appropriately.  (we
436  * avoid synchronously deleting truncated objects because it's slow.)
437  *
438  * if @do_sync, include a 'startsync' command so that the osd will flush
439  * data quickly.
440  */
441 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
442                                                struct ceph_file_layout *layout,
443                                                struct ceph_vino vino,
444                                                u64 off, u64 *plen,
445                                                int opcode, int flags,
446                                                struct ceph_snap_context *snapc,
447                                                int do_sync,
448                                                u32 truncate_seq,
449                                                u64 truncate_size,
450                                                struct timespec *mtime,
451                                                bool use_mempool, int num_reply,
452                                                int page_align)
453 {
454         struct ceph_osd_req_op ops[3];
455         struct ceph_osd_request *req;
456
457         ops[0].op = opcode;
458         ops[0].extent.truncate_seq = truncate_seq;
459         ops[0].extent.truncate_size = truncate_size;
460         ops[0].payload_len = 0;
461
462         if (do_sync) {
463                 ops[1].op = CEPH_OSD_OP_STARTSYNC;
464                 ops[1].payload_len = 0;
465                 ops[2].op = 0;
466         } else
467                 ops[1].op = 0;
468
469         req = ceph_osdc_alloc_request(osdc, flags,
470                                          snapc, ops,
471                                          use_mempool,
472                                          GFP_NOFS, NULL, NULL);
473         if (IS_ERR(req))
474                 return req;
475
476         /* calculate max write size */
477         calc_layout(osdc, vino, layout, off, plen, req, ops);
478         req->r_file_layout = *layout;  /* keep a copy */
479
480         /* in case it differs from natural alignment that calc_layout
481            filled in for us */
482         req->r_page_alignment = page_align;
483
484         ceph_osdc_build_request(req, off, plen, ops,
485                                 snapc,
486                                 mtime,
487                                 req->r_oid, req->r_oid_len);
488
489         return req;
490 }
491 EXPORT_SYMBOL(ceph_osdc_new_request);
492
493 /*
494  * We keep osd requests in an rbtree, sorted by ->r_tid.
495  */
496 static void __insert_request(struct ceph_osd_client *osdc,
497                              struct ceph_osd_request *new)
498 {
499         struct rb_node **p = &osdc->requests.rb_node;
500         struct rb_node *parent = NULL;
501         struct ceph_osd_request *req = NULL;
502
503         while (*p) {
504                 parent = *p;
505                 req = rb_entry(parent, struct ceph_osd_request, r_node);
506                 if (new->r_tid < req->r_tid)
507                         p = &(*p)->rb_left;
508                 else if (new->r_tid > req->r_tid)
509                         p = &(*p)->rb_right;
510                 else
511                         BUG();
512         }
513
514         rb_link_node(&new->r_node, parent, p);
515         rb_insert_color(&new->r_node, &osdc->requests);
516 }
517
518 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
519                                                  u64 tid)
520 {
521         struct ceph_osd_request *req;
522         struct rb_node *n = osdc->requests.rb_node;
523
524         while (n) {
525                 req = rb_entry(n, struct ceph_osd_request, r_node);
526                 if (tid < req->r_tid)
527                         n = n->rb_left;
528                 else if (tid > req->r_tid)
529                         n = n->rb_right;
530                 else
531                         return req;
532         }
533         return NULL;
534 }
535
536 static struct ceph_osd_request *
537 __lookup_request_ge(struct ceph_osd_client *osdc,
538                     u64 tid)
539 {
540         struct ceph_osd_request *req;
541         struct rb_node *n = osdc->requests.rb_node;
542
543         while (n) {
544                 req = rb_entry(n, struct ceph_osd_request, r_node);
545                 if (tid < req->r_tid) {
546                         if (!n->rb_left)
547                                 return req;
548                         n = n->rb_left;
549                 } else if (tid > req->r_tid) {
550                         n = n->rb_right;
551                 } else {
552                         return req;
553                 }
554         }
555         return NULL;
556 }
557
558 /*
559  * Resubmit requests pending on the given osd.
560  */
561 static void __kick_osd_requests(struct ceph_osd_client *osdc,
562                                 struct ceph_osd *osd)
563 {
564         struct ceph_osd_request *req, *nreq;
565         int err;
566
567         dout("__kick_osd_requests osd%d\n", osd->o_osd);
568         err = __reset_osd(osdc, osd);
569         if (err == -EAGAIN)
570                 return;
571
572         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
573                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
574                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
575                      osd->o_osd);
576                 if (!req->r_linger)
577                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
578         }
579
580         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
581                                  r_linger_osd) {
582                 __unregister_linger_request(osdc, req);
583                 __register_request(osdc, req);
584                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
585                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
586                      osd->o_osd);
587         }
588 }
589
590 static void kick_osd_requests(struct ceph_osd_client *osdc,
591                               struct ceph_osd *kickosd)
592 {
593         mutex_lock(&osdc->request_mutex);
594         __kick_osd_requests(osdc, kickosd);
595         mutex_unlock(&osdc->request_mutex);
596 }
597
598 /*
599  * If the osd connection drops, we need to resubmit all requests.
600  */
601 static void osd_reset(struct ceph_connection *con)
602 {
603         struct ceph_osd *osd = con->private;
604         struct ceph_osd_client *osdc;
605
606         if (!osd)
607                 return;
608         dout("osd_reset osd%d\n", osd->o_osd);
609         osdc = osd->o_osdc;
610         down_read(&osdc->map_sem);
611         kick_osd_requests(osdc, osd);
612         send_queued(osdc);
613         up_read(&osdc->map_sem);
614 }
615
616 /*
617  * Track open sessions with osds.
618  */
619 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
620 {
621         struct ceph_osd *osd;
622
623         osd = kzalloc(sizeof(*osd), GFP_NOFS);
624         if (!osd)
625                 return NULL;
626
627         atomic_set(&osd->o_ref, 1);
628         osd->o_osdc = osdc;
629         INIT_LIST_HEAD(&osd->o_requests);
630         INIT_LIST_HEAD(&osd->o_linger_requests);
631         INIT_LIST_HEAD(&osd->o_osd_lru);
632         osd->o_incarnation = 1;
633
634         ceph_con_init(osdc->client->msgr, &osd->o_con);
635         osd->o_con.private = osd;
636         osd->o_con.ops = &osd_con_ops;
637         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
638
639         INIT_LIST_HEAD(&osd->o_keepalive_item);
640         return osd;
641 }
642
643 static struct ceph_osd *get_osd(struct ceph_osd *osd)
644 {
645         if (atomic_inc_not_zero(&osd->o_ref)) {
646                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
647                      atomic_read(&osd->o_ref));
648                 return osd;
649         } else {
650                 dout("get_osd %p FAIL\n", osd);
651                 return NULL;
652         }
653 }
654
655 static void put_osd(struct ceph_osd *osd)
656 {
657         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
658              atomic_read(&osd->o_ref) - 1);
659         if (atomic_dec_and_test(&osd->o_ref)) {
660                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
661
662                 if (osd->o_authorizer)
663                         ac->ops->destroy_authorizer(ac, osd->o_authorizer);
664                 kfree(osd);
665         }
666 }
667
668 /*
669  * remove an osd from our map
670  */
671 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
672 {
673         dout("__remove_osd %p\n", osd);
674         BUG_ON(!list_empty(&osd->o_requests));
675         rb_erase(&osd->o_node, &osdc->osds);
676         list_del_init(&osd->o_osd_lru);
677         ceph_con_close(&osd->o_con);
678         put_osd(osd);
679 }
680
681 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
682                               struct ceph_osd *osd)
683 {
684         dout("__move_osd_to_lru %p\n", osd);
685         BUG_ON(!list_empty(&osd->o_osd_lru));
686         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
687         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
688 }
689
690 static void __remove_osd_from_lru(struct ceph_osd *osd)
691 {
692         dout("__remove_osd_from_lru %p\n", osd);
693         if (!list_empty(&osd->o_osd_lru))
694                 list_del_init(&osd->o_osd_lru);
695 }
696
697 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
698 {
699         struct ceph_osd *osd, *nosd;
700
701         dout("__remove_old_osds %p\n", osdc);
702         mutex_lock(&osdc->request_mutex);
703         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
704                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
705                         break;
706                 __remove_osd(osdc, osd);
707         }
708         mutex_unlock(&osdc->request_mutex);
709 }
710
711 /*
712  * reset osd connect
713  */
714 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
715 {
716         struct ceph_osd_request *req;
717         int ret = 0;
718
719         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
720         if (list_empty(&osd->o_requests) &&
721             list_empty(&osd->o_linger_requests)) {
722                 __remove_osd(osdc, osd);
723         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
724                           &osd->o_con.peer_addr,
725                           sizeof(osd->o_con.peer_addr)) == 0 &&
726                    !ceph_con_opened(&osd->o_con)) {
727                 dout(" osd addr hasn't changed and connection never opened,"
728                      " letting msgr retry");
729                 /* touch each r_stamp for handle_timeout()'s benfit */
730                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
731                         req->r_stamp = jiffies;
732                 ret = -EAGAIN;
733         } else {
734                 ceph_con_close(&osd->o_con);
735                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
736                 osd->o_incarnation++;
737         }
738         return ret;
739 }
740
741 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
742 {
743         struct rb_node **p = &osdc->osds.rb_node;
744         struct rb_node *parent = NULL;
745         struct ceph_osd *osd = NULL;
746
747         while (*p) {
748                 parent = *p;
749                 osd = rb_entry(parent, struct ceph_osd, o_node);
750                 if (new->o_osd < osd->o_osd)
751                         p = &(*p)->rb_left;
752                 else if (new->o_osd > osd->o_osd)
753                         p = &(*p)->rb_right;
754                 else
755                         BUG();
756         }
757
758         rb_link_node(&new->o_node, parent, p);
759         rb_insert_color(&new->o_node, &osdc->osds);
760 }
761
762 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
763 {
764         struct ceph_osd *osd;
765         struct rb_node *n = osdc->osds.rb_node;
766
767         while (n) {
768                 osd = rb_entry(n, struct ceph_osd, o_node);
769                 if (o < osd->o_osd)
770                         n = n->rb_left;
771                 else if (o > osd->o_osd)
772                         n = n->rb_right;
773                 else
774                         return osd;
775         }
776         return NULL;
777 }
778
779 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
780 {
781         schedule_delayed_work(&osdc->timeout_work,
782                         osdc->client->options->osd_keepalive_timeout * HZ);
783 }
784
785 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
786 {
787         cancel_delayed_work(&osdc->timeout_work);
788 }
789
790 /*
791  * Register request, assign tid.  If this is the first request, set up
792  * the timeout event.
793  */
794 static void __register_request(struct ceph_osd_client *osdc,
795                                struct ceph_osd_request *req)
796 {
797         req->r_tid = ++osdc->last_tid;
798         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
799         INIT_LIST_HEAD(&req->r_req_lru_item);
800
801         dout("register_request %p tid %lld\n", req, req->r_tid);
802         __insert_request(osdc, req);
803         ceph_osdc_get_request(req);
804         osdc->num_requests++;
805
806         if (osdc->num_requests == 1) {
807                 dout(" first request, scheduling timeout\n");
808                 __schedule_osd_timeout(osdc);
809         }
810 }
811
812 static void register_request(struct ceph_osd_client *osdc,
813                              struct ceph_osd_request *req)
814 {
815         mutex_lock(&osdc->request_mutex);
816         __register_request(osdc, req);
817         mutex_unlock(&osdc->request_mutex);
818 }
819
820 /*
821  * called under osdc->request_mutex
822  */
823 static void __unregister_request(struct ceph_osd_client *osdc,
824                                  struct ceph_osd_request *req)
825 {
826         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
827         rb_erase(&req->r_node, &osdc->requests);
828         osdc->num_requests--;
829
830         if (req->r_osd) {
831                 /* make sure the original request isn't in flight. */
832                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
833
834                 list_del_init(&req->r_osd_item);
835                 if (list_empty(&req->r_osd->o_requests) &&
836                     list_empty(&req->r_osd->o_linger_requests)) {
837                         dout("moving osd to %p lru\n", req->r_osd);
838                         __move_osd_to_lru(osdc, req->r_osd);
839                 }
840                 if (list_empty(&req->r_osd_item) &&
841                     list_empty(&req->r_linger_item))
842                         req->r_osd = NULL;
843         }
844
845         ceph_osdc_put_request(req);
846
847         list_del_init(&req->r_req_lru_item);
848         if (osdc->num_requests == 0) {
849                 dout(" no requests, canceling timeout\n");
850                 __cancel_osd_timeout(osdc);
851         }
852 }
853
854 /*
855  * Cancel a previously queued request message
856  */
857 static void __cancel_request(struct ceph_osd_request *req)
858 {
859         if (req->r_sent && req->r_osd) {
860                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
861                 req->r_sent = 0;
862         }
863 }
864
865 static void __register_linger_request(struct ceph_osd_client *osdc,
866                                     struct ceph_osd_request *req)
867 {
868         dout("__register_linger_request %p\n", req);
869         list_add_tail(&req->r_linger_item, &osdc->req_linger);
870         list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
871 }
872
873 static void __unregister_linger_request(struct ceph_osd_client *osdc,
874                                         struct ceph_osd_request *req)
875 {
876         dout("__unregister_linger_request %p\n", req);
877         if (req->r_osd) {
878                 list_del_init(&req->r_linger_item);
879                 list_del_init(&req->r_linger_osd);
880
881                 if (list_empty(&req->r_osd->o_requests) &&
882                     list_empty(&req->r_osd->o_linger_requests)) {
883                         dout("moving osd to %p lru\n", req->r_osd);
884                         __move_osd_to_lru(osdc, req->r_osd);
885                 }
886                 req->r_osd = NULL;
887         }
888 }
889
890 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
891                                          struct ceph_osd_request *req)
892 {
893         mutex_lock(&osdc->request_mutex);
894         if (req->r_linger) {
895                 __unregister_linger_request(osdc, req);
896                 ceph_osdc_put_request(req);
897         }
898         mutex_unlock(&osdc->request_mutex);
899 }
900 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
901
902 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
903                                   struct ceph_osd_request *req)
904 {
905         if (!req->r_linger) {
906                 dout("set_request_linger %p\n", req);
907                 req->r_linger = 1;
908                 /*
909                  * caller is now responsible for calling
910                  * unregister_linger_request
911                  */
912                 ceph_osdc_get_request(req);
913         }
914 }
915 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
916
917 /*
918  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
919  * (as needed), and set the request r_osd appropriately.  If there is
920  * no up osd, set r_osd to NULL.  Move the request to the appropiate list
921  * (unsent, homeless) or leave on in-flight lru.
922  *
923  * Return 0 if unchanged, 1 if changed, or negative on error.
924  *
925  * Caller should hold map_sem for read and request_mutex.
926  */
927 static int __map_request(struct ceph_osd_client *osdc,
928                          struct ceph_osd_request *req)
929 {
930         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
931         struct ceph_pg pgid;
932         int acting[CEPH_PG_MAX_SIZE];
933         int o = -1, num = 0;
934         int err;
935
936         dout("map_request %p tid %lld\n", req, req->r_tid);
937         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
938                                       &req->r_file_layout, osdc->osdmap);
939         if (err) {
940                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
941                 return err;
942         }
943         pgid = reqhead->layout.ol_pgid;
944         req->r_pgid = pgid;
945
946         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
947         if (err > 0) {
948                 o = acting[0];
949                 num = err;
950         }
951
952         if ((req->r_osd && req->r_osd->o_osd == o &&
953              req->r_sent >= req->r_osd->o_incarnation &&
954              req->r_num_pg_osds == num &&
955              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
956             (req->r_osd == NULL && o == -1))
957                 return 0;  /* no change */
958
959         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
960              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
961              req->r_osd ? req->r_osd->o_osd : -1);
962
963         /* record full pg acting set */
964         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
965         req->r_num_pg_osds = num;
966
967         if (req->r_osd) {
968                 __cancel_request(req);
969                 list_del_init(&req->r_osd_item);
970                 req->r_osd = NULL;
971         }
972
973         req->r_osd = __lookup_osd(osdc, o);
974         if (!req->r_osd && o >= 0) {
975                 err = -ENOMEM;
976                 req->r_osd = create_osd(osdc);
977                 if (!req->r_osd) {
978                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
979                         goto out;
980                 }
981
982                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
983                 req->r_osd->o_osd = o;
984                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
985                 __insert_osd(osdc, req->r_osd);
986
987                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
988         }
989
990         if (req->r_osd) {
991                 __remove_osd_from_lru(req->r_osd);
992                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
993                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
994         } else {
995                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
996         }
997         err = 1;   /* osd or pg changed */
998
999 out:
1000         return err;
1001 }
1002
1003 /*
1004  * caller should hold map_sem (for read) and request_mutex
1005  */
1006 static int __send_request(struct ceph_osd_client *osdc,
1007                           struct ceph_osd_request *req)
1008 {
1009         struct ceph_osd_request_head *reqhead;
1010
1011         dout("send_request %p tid %llu to osd%d flags %d\n",
1012              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1013
1014         reqhead = req->r_request->front.iov_base;
1015         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1016         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
1017         reqhead->reassert_version = req->r_reassert_version;
1018
1019         req->r_stamp = jiffies;
1020         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1021
1022         ceph_msg_get(req->r_request); /* send consumes a ref */
1023         ceph_con_send(&req->r_osd->o_con, req->r_request);
1024         req->r_sent = req->r_osd->o_incarnation;
1025         return 0;
1026 }
1027
1028 /*
1029  * Send any requests in the queue (req_unsent).
1030  */
1031 static void send_queued(struct ceph_osd_client *osdc)
1032 {
1033         struct ceph_osd_request *req, *tmp;
1034
1035         dout("send_queued\n");
1036         mutex_lock(&osdc->request_mutex);
1037         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1038                 __send_request(osdc, req);
1039         }
1040         mutex_unlock(&osdc->request_mutex);
1041 }
1042
1043 /*
1044  * Timeout callback, called every N seconds when 1 or more osd
1045  * requests has been active for more than N seconds.  When this
1046  * happens, we ping all OSDs with requests who have timed out to
1047  * ensure any communications channel reset is detected.  Reset the
1048  * request timeouts another N seconds in the future as we go.
1049  * Reschedule the timeout event another N seconds in future (unless
1050  * there are no open requests).
1051  */
1052 static void handle_timeout(struct work_struct *work)
1053 {
1054         struct ceph_osd_client *osdc =
1055                 container_of(work, struct ceph_osd_client, timeout_work.work);
1056         struct ceph_osd_request *req, *last_req = NULL;
1057         struct ceph_osd *osd;
1058         unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1059         unsigned long keepalive =
1060                 osdc->client->options->osd_keepalive_timeout * HZ;
1061         unsigned long last_stamp = 0;
1062         struct list_head slow_osds;
1063         dout("timeout\n");
1064         down_read(&osdc->map_sem);
1065
1066         ceph_monc_request_next_osdmap(&osdc->client->monc);
1067
1068         mutex_lock(&osdc->request_mutex);
1069
1070         /*
1071          * reset osds that appear to be _really_ unresponsive.  this
1072          * is a failsafe measure.. we really shouldn't be getting to
1073          * this point if the system is working properly.  the monitors
1074          * should mark the osd as failed and we should find out about
1075          * it from an updated osd map.
1076          */
1077         while (timeout && !list_empty(&osdc->req_lru)) {
1078                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1079                                  r_req_lru_item);
1080
1081                 if (time_before(jiffies, req->r_stamp + timeout))
1082                         break;
1083
1084                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1085                 last_req = req;
1086                 last_stamp = req->r_stamp;
1087
1088                 osd = req->r_osd;
1089                 BUG_ON(!osd);
1090                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1091                            req->r_tid, osd->o_osd);
1092                 __kick_osd_requests(osdc, osd);
1093         }
1094
1095         /*
1096          * ping osds that are a bit slow.  this ensures that if there
1097          * is a break in the TCP connection we will notice, and reopen
1098          * a connection with that osd (from the fault callback).
1099          */
1100         INIT_LIST_HEAD(&slow_osds);
1101         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1102                 if (time_before(jiffies, req->r_stamp + keepalive))
1103                         break;
1104
1105                 osd = req->r_osd;
1106                 BUG_ON(!osd);
1107                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1108                      req->r_tid, osd->o_osd);
1109                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1110         }
1111         while (!list_empty(&slow_osds)) {
1112                 osd = list_entry(slow_osds.next, struct ceph_osd,
1113                                  o_keepalive_item);
1114                 list_del_init(&osd->o_keepalive_item);
1115                 ceph_con_keepalive(&osd->o_con);
1116         }
1117
1118         __schedule_osd_timeout(osdc);
1119         mutex_unlock(&osdc->request_mutex);
1120         send_queued(osdc);
1121         up_read(&osdc->map_sem);
1122 }
1123
1124 static void handle_osds_timeout(struct work_struct *work)
1125 {
1126         struct ceph_osd_client *osdc =
1127                 container_of(work, struct ceph_osd_client,
1128                              osds_timeout_work.work);
1129         unsigned long delay =
1130                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1131
1132         dout("osds timeout\n");
1133         down_read(&osdc->map_sem);
1134         remove_old_osds(osdc, 0);
1135         up_read(&osdc->map_sem);
1136
1137         schedule_delayed_work(&osdc->osds_timeout_work,
1138                               round_jiffies_relative(delay));
1139 }
1140
1141 /*
1142  * handle osd op reply.  either call the callback if it is specified,
1143  * or do the completion to wake up the waiting thread.
1144  */
1145 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1146                          struct ceph_connection *con)
1147 {
1148         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1149         struct ceph_osd_request *req;
1150         u64 tid;
1151         int numops, object_len, flags;
1152         s32 result;
1153
1154         tid = le64_to_cpu(msg->hdr.tid);
1155         if (msg->front.iov_len < sizeof(*rhead))
1156                 goto bad;
1157         numops = le32_to_cpu(rhead->num_ops);
1158         object_len = le32_to_cpu(rhead->object_len);
1159         result = le32_to_cpu(rhead->result);
1160         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1161             numops * sizeof(struct ceph_osd_op))
1162                 goto bad;
1163         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1164         /* lookup */
1165         mutex_lock(&osdc->request_mutex);
1166         req = __lookup_request(osdc, tid);
1167         if (req == NULL) {
1168                 dout("handle_reply tid %llu dne\n", tid);
1169                 mutex_unlock(&osdc->request_mutex);
1170                 return;
1171         }
1172         ceph_osdc_get_request(req);
1173         flags = le32_to_cpu(rhead->flags);
1174
1175         /*
1176          * if this connection filled our message, drop our reference now, to
1177          * avoid a (safe but slower) revoke later.
1178          */
1179         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1180                 dout(" dropping con_filling_msg ref %p\n", con);
1181                 req->r_con_filling_msg = NULL;
1182                 ceph_con_put(con);
1183         }
1184
1185         if (!req->r_got_reply) {
1186                 unsigned bytes;
1187
1188                 req->r_result = le32_to_cpu(rhead->result);
1189                 bytes = le32_to_cpu(msg->hdr.data_len);
1190                 dout("handle_reply result %d bytes %d\n", req->r_result,
1191                      bytes);
1192                 if (req->r_result == 0)
1193                         req->r_result = bytes;
1194
1195                 /* in case this is a write and we need to replay, */
1196                 req->r_reassert_version = rhead->reassert_version;
1197
1198                 req->r_got_reply = 1;
1199         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1200                 dout("handle_reply tid %llu dup ack\n", tid);
1201                 mutex_unlock(&osdc->request_mutex);
1202                 goto done;
1203         }
1204
1205         dout("handle_reply tid %llu flags %d\n", tid, flags);
1206
1207         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1208                 __register_linger_request(osdc, req);
1209
1210         /* either this is a read, or we got the safe response */
1211         if (result < 0 ||
1212             (flags & CEPH_OSD_FLAG_ONDISK) ||
1213             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1214                 __unregister_request(osdc, req);
1215
1216         mutex_unlock(&osdc->request_mutex);
1217
1218         if (req->r_callback)
1219                 req->r_callback(req, msg);
1220         else
1221                 complete_all(&req->r_completion);
1222
1223         if (flags & CEPH_OSD_FLAG_ONDISK) {
1224                 if (req->r_safe_callback)
1225                         req->r_safe_callback(req, msg);
1226                 complete_all(&req->r_safe_completion);  /* fsync waiter */
1227         }
1228
1229 done:
1230         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1231         ceph_osdc_put_request(req);
1232         return;
1233
1234 bad:
1235         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1236                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1237                (int)sizeof(*rhead));
1238         ceph_msg_dump(msg);
1239 }
1240
1241 static void reset_changed_osds(struct ceph_osd_client *osdc)
1242 {
1243         struct rb_node *p, *n;
1244
1245         for (p = rb_first(&osdc->osds); p; p = n) {
1246                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1247
1248                 n = rb_next(p);
1249                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1250                     memcmp(&osd->o_con.peer_addr,
1251                            ceph_osd_addr(osdc->osdmap,
1252                                          osd->o_osd),
1253                            sizeof(struct ceph_entity_addr)) != 0)
1254                         __reset_osd(osdc, osd);
1255         }
1256 }
1257
1258 /*
1259  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1260  * no osd, request a new map.
1261  *
1262  * Caller should hold map_sem for read and request_mutex.
1263  */
1264 static void kick_requests(struct ceph_osd_client *osdc)
1265 {
1266         struct ceph_osd_request *req, *nreq;
1267         struct rb_node *p;
1268         int needmap = 0;
1269         int err;
1270
1271         dout("kick_requests\n");
1272         mutex_lock(&osdc->request_mutex);
1273         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1274                 req = rb_entry(p, struct ceph_osd_request, r_node);
1275                 err = __map_request(osdc, req);
1276                 if (err < 0)
1277                         continue;  /* error */
1278                 if (req->r_osd == NULL) {
1279                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1280                         needmap++;  /* request a newer map */
1281                 } else if (err > 0) {
1282                         dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1283                              req->r_osd ? req->r_osd->o_osd : -1);
1284                         if (!req->r_linger)
1285                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1286                 }
1287         }
1288
1289         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1290                                  r_linger_item) {
1291                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1292
1293                 err = __map_request(osdc, req);
1294                 if (err == 0)
1295                         continue;  /* no change and no osd was specified */
1296                 if (err < 0)
1297                         continue;  /* hrm! */
1298                 if (req->r_osd == NULL) {
1299                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1300                         needmap++;  /* request a newer map */
1301                         continue;
1302                 }
1303
1304                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1305                      req->r_osd ? req->r_osd->o_osd : -1);
1306                 __unregister_linger_request(osdc, req);
1307                 __register_request(osdc, req);
1308         }
1309         mutex_unlock(&osdc->request_mutex);
1310
1311         if (needmap) {
1312                 dout("%d requests for down osds, need new map\n", needmap);
1313                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1314         }
1315 }
1316
1317
1318 /*
1319  * Process updated osd map.
1320  *
1321  * The message contains any number of incremental and full maps, normally
1322  * indicating some sort of topology change in the cluster.  Kick requests
1323  * off to different OSDs as needed.
1324  */
1325 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1326 {
1327         void *p, *end, *next;
1328         u32 nr_maps, maplen;
1329         u32 epoch;
1330         struct ceph_osdmap *newmap = NULL, *oldmap;
1331         int err;
1332         struct ceph_fsid fsid;
1333
1334         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1335         p = msg->front.iov_base;
1336         end = p + msg->front.iov_len;
1337
1338         /* verify fsid */
1339         ceph_decode_need(&p, end, sizeof(fsid), bad);
1340         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1341         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1342                 return;
1343
1344         down_write(&osdc->map_sem);
1345
1346         /* incremental maps */
1347         ceph_decode_32_safe(&p, end, nr_maps, bad);
1348         dout(" %d inc maps\n", nr_maps);
1349         while (nr_maps > 0) {
1350                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1351                 epoch = ceph_decode_32(&p);
1352                 maplen = ceph_decode_32(&p);
1353                 ceph_decode_need(&p, end, maplen, bad);
1354                 next = p + maplen;
1355                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1356                         dout("applying incremental map %u len %d\n",
1357                              epoch, maplen);
1358                         newmap = osdmap_apply_incremental(&p, next,
1359                                                           osdc->osdmap,
1360                                                           osdc->client->msgr);
1361                         if (IS_ERR(newmap)) {
1362                                 err = PTR_ERR(newmap);
1363                                 goto bad;
1364                         }
1365                         BUG_ON(!newmap);
1366                         if (newmap != osdc->osdmap) {
1367                                 ceph_osdmap_destroy(osdc->osdmap);
1368                                 osdc->osdmap = newmap;
1369                         }
1370                         kick_requests(osdc);
1371                         reset_changed_osds(osdc);
1372                 } else {
1373                         dout("ignoring incremental map %u len %d\n",
1374                              epoch, maplen);
1375                 }
1376                 p = next;
1377                 nr_maps--;
1378         }
1379         if (newmap)
1380                 goto done;
1381
1382         /* full maps */
1383         ceph_decode_32_safe(&p, end, nr_maps, bad);
1384         dout(" %d full maps\n", nr_maps);
1385         while (nr_maps) {
1386                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1387                 epoch = ceph_decode_32(&p);
1388                 maplen = ceph_decode_32(&p);
1389                 ceph_decode_need(&p, end, maplen, bad);
1390                 if (nr_maps > 1) {
1391                         dout("skipping non-latest full map %u len %d\n",
1392                              epoch, maplen);
1393                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1394                         dout("skipping full map %u len %d, "
1395                              "older than our %u\n", epoch, maplen,
1396                              osdc->osdmap->epoch);
1397                 } else {
1398                         dout("taking full map %u len %d\n", epoch, maplen);
1399                         newmap = osdmap_decode(&p, p+maplen);
1400                         if (IS_ERR(newmap)) {
1401                                 err = PTR_ERR(newmap);
1402                                 goto bad;
1403                         }
1404                         BUG_ON(!newmap);
1405                         oldmap = osdc->osdmap;
1406                         osdc->osdmap = newmap;
1407                         if (oldmap)
1408                                 ceph_osdmap_destroy(oldmap);
1409                         kick_requests(osdc);
1410                 }
1411                 p += maplen;
1412                 nr_maps--;
1413         }
1414
1415 done:
1416         downgrade_write(&osdc->map_sem);
1417         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1418         send_queued(osdc);
1419         up_read(&osdc->map_sem);
1420         wake_up_all(&osdc->client->auth_wq);
1421         return;
1422
1423 bad:
1424         pr_err("osdc handle_map corrupt msg\n");
1425         ceph_msg_dump(msg);
1426         up_write(&osdc->map_sem);
1427         return;
1428 }
1429
1430 /*
1431  * watch/notify callback event infrastructure
1432  *
1433  * These callbacks are used both for watch and notify operations.
1434  */
1435 static void __release_event(struct kref *kref)
1436 {
1437         struct ceph_osd_event *event =
1438                 container_of(kref, struct ceph_osd_event, kref);
1439
1440         dout("__release_event %p\n", event);
1441         kfree(event);
1442 }
1443
1444 static void get_event(struct ceph_osd_event *event)
1445 {
1446         kref_get(&event->kref);
1447 }
1448
1449 void ceph_osdc_put_event(struct ceph_osd_event *event)
1450 {
1451         kref_put(&event->kref, __release_event);
1452 }
1453 EXPORT_SYMBOL(ceph_osdc_put_event);
1454
1455 static void __insert_event(struct ceph_osd_client *osdc,
1456                              struct ceph_osd_event *new)
1457 {
1458         struct rb_node **p = &osdc->event_tree.rb_node;
1459         struct rb_node *parent = NULL;
1460         struct ceph_osd_event *event = NULL;
1461
1462         while (*p) {
1463                 parent = *p;
1464                 event = rb_entry(parent, struct ceph_osd_event, node);
1465                 if (new->cookie < event->cookie)
1466                         p = &(*p)->rb_left;
1467                 else if (new->cookie > event->cookie)
1468                         p = &(*p)->rb_right;
1469                 else
1470                         BUG();
1471         }
1472
1473         rb_link_node(&new->node, parent, p);
1474         rb_insert_color(&new->node, &osdc->event_tree);
1475 }
1476
1477 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1478                                                 u64 cookie)
1479 {
1480         struct rb_node **p = &osdc->event_tree.rb_node;
1481         struct rb_node *parent = NULL;
1482         struct ceph_osd_event *event = NULL;
1483
1484         while (*p) {
1485                 parent = *p;
1486                 event = rb_entry(parent, struct ceph_osd_event, node);
1487                 if (cookie < event->cookie)
1488                         p = &(*p)->rb_left;
1489                 else if (cookie > event->cookie)
1490                         p = &(*p)->rb_right;
1491                 else
1492                         return event;
1493         }
1494         return NULL;
1495 }
1496
1497 static void __remove_event(struct ceph_osd_event *event)
1498 {
1499         struct ceph_osd_client *osdc = event->osdc;
1500
1501         if (!RB_EMPTY_NODE(&event->node)) {
1502                 dout("__remove_event removed %p\n", event);
1503                 rb_erase(&event->node, &osdc->event_tree);
1504                 ceph_osdc_put_event(event);
1505         } else {
1506                 dout("__remove_event didn't remove %p\n", event);
1507         }
1508 }
1509
1510 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1511                            void (*event_cb)(u64, u64, u8, void *),
1512                            int one_shot, void *data,
1513                            struct ceph_osd_event **pevent)
1514 {
1515         struct ceph_osd_event *event;
1516
1517         event = kmalloc(sizeof(*event), GFP_NOIO);
1518         if (!event)
1519                 return -ENOMEM;
1520
1521         dout("create_event %p\n", event);
1522         event->cb = event_cb;
1523         event->one_shot = one_shot;
1524         event->data = data;
1525         event->osdc = osdc;
1526         INIT_LIST_HEAD(&event->osd_node);
1527         kref_init(&event->kref);   /* one ref for us */
1528         kref_get(&event->kref);    /* one ref for the caller */
1529         init_completion(&event->completion);
1530
1531         spin_lock(&osdc->event_lock);
1532         event->cookie = ++osdc->event_count;
1533         __insert_event(osdc, event);
1534         spin_unlock(&osdc->event_lock);
1535
1536         *pevent = event;
1537         return 0;
1538 }
1539 EXPORT_SYMBOL(ceph_osdc_create_event);
1540
1541 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1542 {
1543         struct ceph_osd_client *osdc = event->osdc;
1544
1545         dout("cancel_event %p\n", event);
1546         spin_lock(&osdc->event_lock);
1547         __remove_event(event);
1548         spin_unlock(&osdc->event_lock);
1549         ceph_osdc_put_event(event); /* caller's */
1550 }
1551 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1552
1553
1554 static void do_event_work(struct work_struct *work)
1555 {
1556         struct ceph_osd_event_work *event_work =
1557                 container_of(work, struct ceph_osd_event_work, work);
1558         struct ceph_osd_event *event = event_work->event;
1559         u64 ver = event_work->ver;
1560         u64 notify_id = event_work->notify_id;
1561         u8 opcode = event_work->opcode;
1562
1563         dout("do_event_work completing %p\n", event);
1564         event->cb(ver, notify_id, opcode, event->data);
1565         complete(&event->completion);
1566         dout("do_event_work completed %p\n", event);
1567         ceph_osdc_put_event(event);
1568         kfree(event_work);
1569 }
1570
1571
1572 /*
1573  * Process osd watch notifications
1574  */
1575 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1576 {
1577         void *p, *end;
1578         u8 proto_ver;
1579         u64 cookie, ver, notify_id;
1580         u8 opcode;
1581         struct ceph_osd_event *event;
1582         struct ceph_osd_event_work *event_work;
1583
1584         p = msg->front.iov_base;
1585         end = p + msg->front.iov_len;
1586
1587         ceph_decode_8_safe(&p, end, proto_ver, bad);
1588         ceph_decode_8_safe(&p, end, opcode, bad);
1589         ceph_decode_64_safe(&p, end, cookie, bad);
1590         ceph_decode_64_safe(&p, end, ver, bad);
1591         ceph_decode_64_safe(&p, end, notify_id, bad);
1592
1593         spin_lock(&osdc->event_lock);
1594         event = __find_event(osdc, cookie);
1595         if (event) {
1596                 get_event(event);
1597                 if (event->one_shot)
1598                         __remove_event(event);
1599         }
1600         spin_unlock(&osdc->event_lock);
1601         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1602              cookie, ver, event);
1603         if (event) {
1604                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1605                 INIT_WORK(&event_work->work, do_event_work);
1606                 if (!event_work) {
1607                         dout("ERROR: could not allocate event_work\n");
1608                         goto done_err;
1609                 }
1610                 event_work->event = event;
1611                 event_work->ver = ver;
1612                 event_work->notify_id = notify_id;
1613                 event_work->opcode = opcode;
1614                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1615                         dout("WARNING: failed to queue notify event work\n");
1616                         goto done_err;
1617                 }
1618         }
1619
1620         return;
1621
1622 done_err:
1623         complete(&event->completion);
1624         ceph_osdc_put_event(event);
1625         return;
1626
1627 bad:
1628         pr_err("osdc handle_watch_notify corrupt msg\n");
1629         return;
1630 }
1631
1632 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1633 {
1634         int err;
1635
1636         dout("wait_event %p\n", event);
1637         err = wait_for_completion_interruptible_timeout(&event->completion,
1638                                                         timeout * HZ);
1639         ceph_osdc_put_event(event);
1640         if (err > 0)
1641                 err = 0;
1642         dout("wait_event %p returns %d\n", event, err);
1643         return err;
1644 }
1645 EXPORT_SYMBOL(ceph_osdc_wait_event);
1646
1647 /*
1648  * Register request, send initial attempt.
1649  */
1650 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1651                             struct ceph_osd_request *req,
1652                             bool nofail)
1653 {
1654         int rc = 0;
1655
1656         req->r_request->pages = req->r_pages;
1657         req->r_request->nr_pages = req->r_num_pages;
1658 #ifdef CONFIG_BLOCK
1659         req->r_request->bio = req->r_bio;
1660 #endif
1661         req->r_request->trail = req->r_trail;
1662
1663         register_request(osdc, req);
1664
1665         down_read(&osdc->map_sem);
1666         mutex_lock(&osdc->request_mutex);
1667         /*
1668          * a racing kick_requests() may have sent the message for us
1669          * while we dropped request_mutex above, so only send now if
1670          * the request still han't been touched yet.
1671          */
1672         if (req->r_sent == 0) {
1673                 rc = __map_request(osdc, req);
1674                 if (rc < 0)
1675                         return rc;
1676                 if (req->r_osd == NULL) {
1677                         dout("send_request %p no up osds in pg\n", req);
1678                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1679                 } else {
1680                         rc = __send_request(osdc, req);
1681                         if (rc) {
1682                                 if (nofail) {
1683                                         dout("osdc_start_request failed send, "
1684                                              " will retry %lld\n", req->r_tid);
1685                                         rc = 0;
1686                                 } else {
1687                                         __unregister_request(osdc, req);
1688                                 }
1689                         }
1690                 }
1691         }
1692         mutex_unlock(&osdc->request_mutex);
1693         up_read(&osdc->map_sem);
1694         return rc;
1695 }
1696 EXPORT_SYMBOL(ceph_osdc_start_request);
1697
1698 /*
1699  * wait for a request to complete
1700  */
1701 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1702                            struct ceph_osd_request *req)
1703 {
1704         int rc;
1705
1706         rc = wait_for_completion_interruptible(&req->r_completion);
1707         if (rc < 0) {
1708                 mutex_lock(&osdc->request_mutex);
1709                 __cancel_request(req);
1710                 __unregister_request(osdc, req);
1711                 mutex_unlock(&osdc->request_mutex);
1712                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1713                 return rc;
1714         }
1715
1716         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1717         return req->r_result;
1718 }
1719 EXPORT_SYMBOL(ceph_osdc_wait_request);
1720
1721 /*
1722  * sync - wait for all in-flight requests to flush.  avoid starvation.
1723  */
1724 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1725 {
1726         struct ceph_osd_request *req;
1727         u64 last_tid, next_tid = 0;
1728
1729         mutex_lock(&osdc->request_mutex);
1730         last_tid = osdc->last_tid;
1731         while (1) {
1732                 req = __lookup_request_ge(osdc, next_tid);
1733                 if (!req)
1734                         break;
1735                 if (req->r_tid > last_tid)
1736                         break;
1737
1738                 next_tid = req->r_tid + 1;
1739                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1740                         continue;
1741
1742                 ceph_osdc_get_request(req);
1743                 mutex_unlock(&osdc->request_mutex);
1744                 dout("sync waiting on tid %llu (last is %llu)\n",
1745                      req->r_tid, last_tid);
1746                 wait_for_completion(&req->r_safe_completion);
1747                 mutex_lock(&osdc->request_mutex);
1748                 ceph_osdc_put_request(req);
1749         }
1750         mutex_unlock(&osdc->request_mutex);
1751         dout("sync done (thru tid %llu)\n", last_tid);
1752 }
1753 EXPORT_SYMBOL(ceph_osdc_sync);
1754
1755 /*
1756  * init, shutdown
1757  */
1758 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1759 {
1760         int err;
1761
1762         dout("init\n");
1763         osdc->client = client;
1764         osdc->osdmap = NULL;
1765         init_rwsem(&osdc->map_sem);
1766         init_completion(&osdc->map_waiters);
1767         osdc->last_requested_map = 0;
1768         mutex_init(&osdc->request_mutex);
1769         osdc->last_tid = 0;
1770         osdc->osds = RB_ROOT;
1771         INIT_LIST_HEAD(&osdc->osd_lru);
1772         osdc->requests = RB_ROOT;
1773         INIT_LIST_HEAD(&osdc->req_lru);
1774         INIT_LIST_HEAD(&osdc->req_unsent);
1775         INIT_LIST_HEAD(&osdc->req_notarget);
1776         INIT_LIST_HEAD(&osdc->req_linger);
1777         osdc->num_requests = 0;
1778         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1779         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1780         spin_lock_init(&osdc->event_lock);
1781         osdc->event_tree = RB_ROOT;
1782         osdc->event_count = 0;
1783
1784         schedule_delayed_work(&osdc->osds_timeout_work,
1785            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1786
1787         err = -ENOMEM;
1788         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1789                                         sizeof(struct ceph_osd_request));
1790         if (!osdc->req_mempool)
1791                 goto out;
1792
1793         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1794                                 "osd_op");
1795         if (err < 0)
1796                 goto out_mempool;
1797         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1798                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1799                                 "osd_op_reply");
1800         if (err < 0)
1801                 goto out_msgpool;
1802
1803         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1804         if (IS_ERR(osdc->notify_wq)) {
1805                 err = PTR_ERR(osdc->notify_wq);
1806                 osdc->notify_wq = NULL;
1807                 goto out_msgpool;
1808         }
1809         return 0;
1810
1811 out_msgpool:
1812         ceph_msgpool_destroy(&osdc->msgpool_op);
1813 out_mempool:
1814         mempool_destroy(osdc->req_mempool);
1815 out:
1816         return err;
1817 }
1818 EXPORT_SYMBOL(ceph_osdc_init);
1819
1820 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1821 {
1822         flush_workqueue(osdc->notify_wq);
1823         destroy_workqueue(osdc->notify_wq);
1824         cancel_delayed_work_sync(&osdc->timeout_work);
1825         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1826         if (osdc->osdmap) {
1827                 ceph_osdmap_destroy(osdc->osdmap);
1828                 osdc->osdmap = NULL;
1829         }
1830         remove_old_osds(osdc, 1);
1831         WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
1832         mempool_destroy(osdc->req_mempool);
1833         ceph_msgpool_destroy(&osdc->msgpool_op);
1834         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1835 }
1836 EXPORT_SYMBOL(ceph_osdc_stop);
1837
1838 /*
1839  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1840  * *plen.  Return number of bytes read, or error.
1841  */
1842 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1843                         struct ceph_vino vino, struct ceph_file_layout *layout,
1844                         u64 off, u64 *plen,
1845                         u32 truncate_seq, u64 truncate_size,
1846                         struct page **pages, int num_pages, int page_align)
1847 {
1848         struct ceph_osd_request *req;
1849         int rc = 0;
1850
1851         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1852              vino.snap, off, *plen);
1853         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1854                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1855                                     NULL, 0, truncate_seq, truncate_size, NULL,
1856                                     false, 1, page_align);
1857         if (!req)
1858                 return -ENOMEM;
1859
1860         /* it may be a short read due to an object boundary */
1861         req->r_pages = pages;
1862
1863         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1864              off, *plen, req->r_num_pages, page_align);
1865
1866         rc = ceph_osdc_start_request(osdc, req, false);
1867         if (!rc)
1868                 rc = ceph_osdc_wait_request(osdc, req);
1869
1870         ceph_osdc_put_request(req);
1871         dout("readpages result %d\n", rc);
1872         return rc;
1873 }
1874 EXPORT_SYMBOL(ceph_osdc_readpages);
1875
1876 /*
1877  * do a synchronous write on N pages
1878  */
1879 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1880                          struct ceph_file_layout *layout,
1881                          struct ceph_snap_context *snapc,
1882                          u64 off, u64 len,
1883                          u32 truncate_seq, u64 truncate_size,
1884                          struct timespec *mtime,
1885                          struct page **pages, int num_pages,
1886                          int flags, int do_sync, bool nofail)
1887 {
1888         struct ceph_osd_request *req;
1889         int rc = 0;
1890         int page_align = off & ~PAGE_MASK;
1891
1892         BUG_ON(vino.snap != CEPH_NOSNAP);
1893         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1894                                     CEPH_OSD_OP_WRITE,
1895                                     flags | CEPH_OSD_FLAG_ONDISK |
1896                                             CEPH_OSD_FLAG_WRITE,
1897                                     snapc, do_sync,
1898                                     truncate_seq, truncate_size, mtime,
1899                                     nofail, 1, page_align);
1900         if (!req)
1901                 return -ENOMEM;
1902
1903         /* it may be a short write due to an object boundary */
1904         req->r_pages = pages;
1905         dout("writepages %llu~%llu (%d pages)\n", off, len,
1906              req->r_num_pages);
1907
1908         rc = ceph_osdc_start_request(osdc, req, nofail);
1909         if (!rc)
1910                 rc = ceph_osdc_wait_request(osdc, req);
1911
1912         ceph_osdc_put_request(req);
1913         if (rc == 0)
1914                 rc = len;
1915         dout("writepages result %d\n", rc);
1916         return rc;
1917 }
1918 EXPORT_SYMBOL(ceph_osdc_writepages);
1919
1920 /*
1921  * handle incoming message
1922  */
1923 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1924 {
1925         struct ceph_osd *osd = con->private;
1926         struct ceph_osd_client *osdc;
1927         int type = le16_to_cpu(msg->hdr.type);
1928
1929         if (!osd)
1930                 goto out;
1931         osdc = osd->o_osdc;
1932
1933         switch (type) {
1934         case CEPH_MSG_OSD_MAP:
1935                 ceph_osdc_handle_map(osdc, msg);
1936                 break;
1937         case CEPH_MSG_OSD_OPREPLY:
1938                 handle_reply(osdc, msg, con);
1939                 break;
1940         case CEPH_MSG_WATCH_NOTIFY:
1941                 handle_watch_notify(osdc, msg);
1942                 break;
1943
1944         default:
1945                 pr_err("received unknown message type %d %s\n", type,
1946                        ceph_msg_type_name(type));
1947         }
1948 out:
1949         ceph_msg_put(msg);
1950 }
1951
1952 /*
1953  * lookup and return message for incoming reply.  set up reply message
1954  * pages.
1955  */
1956 static struct ceph_msg *get_reply(struct ceph_connection *con,
1957                                   struct ceph_msg_header *hdr,
1958                                   int *skip)
1959 {
1960         struct ceph_osd *osd = con->private;
1961         struct ceph_osd_client *osdc = osd->o_osdc;
1962         struct ceph_msg *m;
1963         struct ceph_osd_request *req;
1964         int front = le32_to_cpu(hdr->front_len);
1965         int data_len = le32_to_cpu(hdr->data_len);
1966         u64 tid;
1967
1968         tid = le64_to_cpu(hdr->tid);
1969         mutex_lock(&osdc->request_mutex);
1970         req = __lookup_request(osdc, tid);
1971         if (!req) {
1972                 *skip = 1;
1973                 m = NULL;
1974                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1975                         osd->o_osd);
1976                 goto out;
1977         }
1978
1979         if (req->r_con_filling_msg) {
1980                 dout("get_reply revoking msg %p from old con %p\n",
1981                      req->r_reply, req->r_con_filling_msg);
1982                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1983                 ceph_con_put(req->r_con_filling_msg);
1984                 req->r_con_filling_msg = NULL;
1985         }
1986
1987         if (front > req->r_reply->front.iov_len) {
1988                 pr_warning("get_reply front %d > preallocated %d\n",
1989                            front, (int)req->r_reply->front.iov_len);
1990                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
1991                 if (!m)
1992                         goto out;
1993                 ceph_msg_put(req->r_reply);
1994                 req->r_reply = m;
1995         }
1996         m = ceph_msg_get(req->r_reply);
1997
1998         if (data_len > 0) {
1999                 int want = calc_pages_for(req->r_page_alignment, data_len);
2000
2001                 if (unlikely(req->r_num_pages < want)) {
2002                         pr_warning("tid %lld reply %d > expected %d pages\n",
2003                                    tid, want, m->nr_pages);
2004                         *skip = 1;
2005                         ceph_msg_put(m);
2006                         m = NULL;
2007                         goto out;
2008                 }
2009                 m->pages = req->r_pages;
2010                 m->nr_pages = req->r_num_pages;
2011                 m->page_alignment = req->r_page_alignment;
2012 #ifdef CONFIG_BLOCK
2013                 m->bio = req->r_bio;
2014 #endif
2015         }
2016         *skip = 0;
2017         req->r_con_filling_msg = ceph_con_get(con);
2018         dout("get_reply tid %lld %p\n", tid, m);
2019
2020 out:
2021         mutex_unlock(&osdc->request_mutex);
2022         return m;
2023
2024 }
2025
2026 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2027                                   struct ceph_msg_header *hdr,
2028                                   int *skip)
2029 {
2030         struct ceph_osd *osd = con->private;
2031         int type = le16_to_cpu(hdr->type);
2032         int front = le32_to_cpu(hdr->front_len);
2033
2034         switch (type) {
2035         case CEPH_MSG_OSD_MAP:
2036         case CEPH_MSG_WATCH_NOTIFY:
2037                 return ceph_msg_new(type, front, GFP_NOFS);
2038         case CEPH_MSG_OSD_OPREPLY:
2039                 return get_reply(con, hdr, skip);
2040         default:
2041                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2042                         osd->o_osd);
2043                 *skip = 1;
2044                 return NULL;
2045         }
2046 }
2047
2048 /*
2049  * Wrappers to refcount containing ceph_osd struct
2050  */
2051 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2052 {
2053         struct ceph_osd *osd = con->private;
2054         if (get_osd(osd))
2055                 return con;
2056         return NULL;
2057 }
2058
2059 static void put_osd_con(struct ceph_connection *con)
2060 {
2061         struct ceph_osd *osd = con->private;
2062         put_osd(osd);
2063 }
2064
2065 /*
2066  * authentication
2067  */
2068 static int get_authorizer(struct ceph_connection *con,
2069                           void **buf, int *len, int *proto,
2070                           void **reply_buf, int *reply_len, int force_new)
2071 {
2072         struct ceph_osd *o = con->private;
2073         struct ceph_osd_client *osdc = o->o_osdc;
2074         struct ceph_auth_client *ac = osdc->client->monc.auth;
2075         int ret = 0;
2076
2077         if (force_new && o->o_authorizer) {
2078                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2079                 o->o_authorizer = NULL;
2080         }
2081         if (o->o_authorizer == NULL) {
2082                 ret = ac->ops->create_authorizer(
2083                         ac, CEPH_ENTITY_TYPE_OSD,
2084                         &o->o_authorizer,
2085                         &o->o_authorizer_buf,
2086                         &o->o_authorizer_buf_len,
2087                         &o->o_authorizer_reply_buf,
2088                         &o->o_authorizer_reply_buf_len);
2089                 if (ret)
2090                         return ret;
2091         }
2092
2093         *proto = ac->protocol;
2094         *buf = o->o_authorizer_buf;
2095         *len = o->o_authorizer_buf_len;
2096         *reply_buf = o->o_authorizer_reply_buf;
2097         *reply_len = o->o_authorizer_reply_buf_len;
2098         return 0;
2099 }
2100
2101
2102 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2103 {
2104         struct ceph_osd *o = con->private;
2105         struct ceph_osd_client *osdc = o->o_osdc;
2106         struct ceph_auth_client *ac = osdc->client->monc.auth;
2107
2108         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2109 }
2110
2111 static int invalidate_authorizer(struct ceph_connection *con)
2112 {
2113         struct ceph_osd *o = con->private;
2114         struct ceph_osd_client *osdc = o->o_osdc;
2115         struct ceph_auth_client *ac = osdc->client->monc.auth;
2116
2117         if (ac->ops->invalidate_authorizer)
2118                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2119
2120         return ceph_monc_validate_auth(&osdc->client->monc);
2121 }
2122
2123 static const struct ceph_connection_operations osd_con_ops = {
2124         .get = get_osd_con,
2125         .put = put_osd_con,
2126         .dispatch = dispatch,
2127         .get_authorizer = get_authorizer,
2128         .verify_authorizer_reply = verify_authorizer_reply,
2129         .invalidate_authorizer = invalidate_authorizer,
2130         .alloc_msg = alloc_msg,
2131         .fault = osd_reset,
2132 };