libceph: fix page calculation for non-page-aligned io
[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         snprintf(req->r_oid, sizeof(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 (!req)
474                 return NULL;
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 (file) alignment that
481            calc_layout filled in for us */
482         req->r_num_pages = calc_pages_for(page_align, *plen);
483         req->r_page_alignment = page_align;
484
485         ceph_osdc_build_request(req, off, plen, ops,
486                                 snapc,
487                                 mtime,
488                                 req->r_oid, req->r_oid_len);
489
490         return req;
491 }
492 EXPORT_SYMBOL(ceph_osdc_new_request);
493
494 /*
495  * We keep osd requests in an rbtree, sorted by ->r_tid.
496  */
497 static void __insert_request(struct ceph_osd_client *osdc,
498                              struct ceph_osd_request *new)
499 {
500         struct rb_node **p = &osdc->requests.rb_node;
501         struct rb_node *parent = NULL;
502         struct ceph_osd_request *req = NULL;
503
504         while (*p) {
505                 parent = *p;
506                 req = rb_entry(parent, struct ceph_osd_request, r_node);
507                 if (new->r_tid < req->r_tid)
508                         p = &(*p)->rb_left;
509                 else if (new->r_tid > req->r_tid)
510                         p = &(*p)->rb_right;
511                 else
512                         BUG();
513         }
514
515         rb_link_node(&new->r_node, parent, p);
516         rb_insert_color(&new->r_node, &osdc->requests);
517 }
518
519 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
520                                                  u64 tid)
521 {
522         struct ceph_osd_request *req;
523         struct rb_node *n = osdc->requests.rb_node;
524
525         while (n) {
526                 req = rb_entry(n, struct ceph_osd_request, r_node);
527                 if (tid < req->r_tid)
528                         n = n->rb_left;
529                 else if (tid > req->r_tid)
530                         n = n->rb_right;
531                 else
532                         return req;
533         }
534         return NULL;
535 }
536
537 static struct ceph_osd_request *
538 __lookup_request_ge(struct ceph_osd_client *osdc,
539                     u64 tid)
540 {
541         struct ceph_osd_request *req;
542         struct rb_node *n = osdc->requests.rb_node;
543
544         while (n) {
545                 req = rb_entry(n, struct ceph_osd_request, r_node);
546                 if (tid < req->r_tid) {
547                         if (!n->rb_left)
548                                 return req;
549                         n = n->rb_left;
550                 } else if (tid > req->r_tid) {
551                         n = n->rb_right;
552                 } else {
553                         return req;
554                 }
555         }
556         return NULL;
557 }
558
559 /*
560  * Resubmit requests pending on the given osd.
561  */
562 static void __kick_osd_requests(struct ceph_osd_client *osdc,
563                                 struct ceph_osd *osd)
564 {
565         struct ceph_osd_request *req, *nreq;
566         int err;
567
568         dout("__kick_osd_requests osd%d\n", osd->o_osd);
569         err = __reset_osd(osdc, osd);
570         if (err == -EAGAIN)
571                 return;
572
573         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
574                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
575                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
576                      osd->o_osd);
577                 if (!req->r_linger)
578                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
579         }
580
581         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
582                                  r_linger_osd) {
583                 /*
584                  * reregister request prior to unregistering linger so
585                  * that r_osd is preserved.
586                  */
587                 BUG_ON(!list_empty(&req->r_req_lru_item));
588                 __register_request(osdc, req);
589                 list_add(&req->r_req_lru_item, &osdc->req_unsent);
590                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
591                 __unregister_linger_request(osdc, req);
592                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
593                      osd->o_osd);
594         }
595 }
596
597 static void kick_osd_requests(struct ceph_osd_client *osdc,
598                               struct ceph_osd *kickosd)
599 {
600         mutex_lock(&osdc->request_mutex);
601         __kick_osd_requests(osdc, kickosd);
602         mutex_unlock(&osdc->request_mutex);
603 }
604
605 /*
606  * If the osd connection drops, we need to resubmit all requests.
607  */
608 static void osd_reset(struct ceph_connection *con)
609 {
610         struct ceph_osd *osd = con->private;
611         struct ceph_osd_client *osdc;
612
613         if (!osd)
614                 return;
615         dout("osd_reset osd%d\n", osd->o_osd);
616         osdc = osd->o_osdc;
617         down_read(&osdc->map_sem);
618         kick_osd_requests(osdc, osd);
619         send_queued(osdc);
620         up_read(&osdc->map_sem);
621 }
622
623 /*
624  * Track open sessions with osds.
625  */
626 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
627 {
628         struct ceph_osd *osd;
629
630         osd = kzalloc(sizeof(*osd), GFP_NOFS);
631         if (!osd)
632                 return NULL;
633
634         atomic_set(&osd->o_ref, 1);
635         osd->o_osdc = osdc;
636         INIT_LIST_HEAD(&osd->o_requests);
637         INIT_LIST_HEAD(&osd->o_linger_requests);
638         INIT_LIST_HEAD(&osd->o_osd_lru);
639         osd->o_incarnation = 1;
640
641         ceph_con_init(osdc->client->msgr, &osd->o_con);
642         osd->o_con.private = osd;
643         osd->o_con.ops = &osd_con_ops;
644         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
645
646         INIT_LIST_HEAD(&osd->o_keepalive_item);
647         return osd;
648 }
649
650 static struct ceph_osd *get_osd(struct ceph_osd *osd)
651 {
652         if (atomic_inc_not_zero(&osd->o_ref)) {
653                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
654                      atomic_read(&osd->o_ref));
655                 return osd;
656         } else {
657                 dout("get_osd %p FAIL\n", osd);
658                 return NULL;
659         }
660 }
661
662 static void put_osd(struct ceph_osd *osd)
663 {
664         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
665              atomic_read(&osd->o_ref) - 1);
666         if (atomic_dec_and_test(&osd->o_ref)) {
667                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
668
669                 if (osd->o_authorizer)
670                         ac->ops->destroy_authorizer(ac, osd->o_authorizer);
671                 kfree(osd);
672         }
673 }
674
675 /*
676  * remove an osd from our map
677  */
678 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
679 {
680         dout("__remove_osd %p\n", osd);
681         BUG_ON(!list_empty(&osd->o_requests));
682         rb_erase(&osd->o_node, &osdc->osds);
683         list_del_init(&osd->o_osd_lru);
684         ceph_con_close(&osd->o_con);
685         put_osd(osd);
686 }
687
688 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
689                               struct ceph_osd *osd)
690 {
691         dout("__move_osd_to_lru %p\n", osd);
692         BUG_ON(!list_empty(&osd->o_osd_lru));
693         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
694         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
695 }
696
697 static void __remove_osd_from_lru(struct ceph_osd *osd)
698 {
699         dout("__remove_osd_from_lru %p\n", osd);
700         if (!list_empty(&osd->o_osd_lru))
701                 list_del_init(&osd->o_osd_lru);
702 }
703
704 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
705 {
706         struct ceph_osd *osd, *nosd;
707
708         dout("__remove_old_osds %p\n", osdc);
709         mutex_lock(&osdc->request_mutex);
710         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
711                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
712                         break;
713                 __remove_osd(osdc, osd);
714         }
715         mutex_unlock(&osdc->request_mutex);
716 }
717
718 /*
719  * reset osd connect
720  */
721 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
722 {
723         struct ceph_osd_request *req;
724         int ret = 0;
725
726         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
727         if (list_empty(&osd->o_requests) &&
728             list_empty(&osd->o_linger_requests)) {
729                 __remove_osd(osdc, osd);
730         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
731                           &osd->o_con.peer_addr,
732                           sizeof(osd->o_con.peer_addr)) == 0 &&
733                    !ceph_con_opened(&osd->o_con)) {
734                 dout(" osd addr hasn't changed and connection never opened,"
735                      " letting msgr retry");
736                 /* touch each r_stamp for handle_timeout()'s benfit */
737                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
738                         req->r_stamp = jiffies;
739                 ret = -EAGAIN;
740         } else {
741                 ceph_con_close(&osd->o_con);
742                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
743                 osd->o_incarnation++;
744         }
745         return ret;
746 }
747
748 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
749 {
750         struct rb_node **p = &osdc->osds.rb_node;
751         struct rb_node *parent = NULL;
752         struct ceph_osd *osd = NULL;
753
754         while (*p) {
755                 parent = *p;
756                 osd = rb_entry(parent, struct ceph_osd, o_node);
757                 if (new->o_osd < osd->o_osd)
758                         p = &(*p)->rb_left;
759                 else if (new->o_osd > osd->o_osd)
760                         p = &(*p)->rb_right;
761                 else
762                         BUG();
763         }
764
765         rb_link_node(&new->o_node, parent, p);
766         rb_insert_color(&new->o_node, &osdc->osds);
767 }
768
769 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
770 {
771         struct ceph_osd *osd;
772         struct rb_node *n = osdc->osds.rb_node;
773
774         while (n) {
775                 osd = rb_entry(n, struct ceph_osd, o_node);
776                 if (o < osd->o_osd)
777                         n = n->rb_left;
778                 else if (o > osd->o_osd)
779                         n = n->rb_right;
780                 else
781                         return osd;
782         }
783         return NULL;
784 }
785
786 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
787 {
788         schedule_delayed_work(&osdc->timeout_work,
789                         osdc->client->options->osd_keepalive_timeout * HZ);
790 }
791
792 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
793 {
794         cancel_delayed_work(&osdc->timeout_work);
795 }
796
797 /*
798  * Register request, assign tid.  If this is the first request, set up
799  * the timeout event.
800  */
801 static void __register_request(struct ceph_osd_client *osdc,
802                                struct ceph_osd_request *req)
803 {
804         req->r_tid = ++osdc->last_tid;
805         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
806         INIT_LIST_HEAD(&req->r_req_lru_item);
807
808         dout("__register_request %p tid %lld\n", req, req->r_tid);
809         __insert_request(osdc, req);
810         ceph_osdc_get_request(req);
811         osdc->num_requests++;
812
813         if (osdc->num_requests == 1) {
814                 dout(" first request, scheduling timeout\n");
815                 __schedule_osd_timeout(osdc);
816         }
817 }
818
819 static void register_request(struct ceph_osd_client *osdc,
820                              struct ceph_osd_request *req)
821 {
822         mutex_lock(&osdc->request_mutex);
823         __register_request(osdc, req);
824         mutex_unlock(&osdc->request_mutex);
825 }
826
827 /*
828  * called under osdc->request_mutex
829  */
830 static void __unregister_request(struct ceph_osd_client *osdc,
831                                  struct ceph_osd_request *req)
832 {
833         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
834         rb_erase(&req->r_node, &osdc->requests);
835         osdc->num_requests--;
836
837         if (req->r_osd) {
838                 /* make sure the original request isn't in flight. */
839                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
840
841                 list_del_init(&req->r_osd_item);
842                 if (list_empty(&req->r_osd->o_requests) &&
843                     list_empty(&req->r_osd->o_linger_requests)) {
844                         dout("moving osd to %p lru\n", req->r_osd);
845                         __move_osd_to_lru(osdc, req->r_osd);
846                 }
847                 if (list_empty(&req->r_linger_item))
848                         req->r_osd = NULL;
849         }
850
851         ceph_osdc_put_request(req);
852
853         list_del_init(&req->r_req_lru_item);
854         if (osdc->num_requests == 0) {
855                 dout(" no requests, canceling timeout\n");
856                 __cancel_osd_timeout(osdc);
857         }
858 }
859
860 /*
861  * Cancel a previously queued request message
862  */
863 static void __cancel_request(struct ceph_osd_request *req)
864 {
865         if (req->r_sent && req->r_osd) {
866                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
867                 req->r_sent = 0;
868         }
869 }
870
871 static void __register_linger_request(struct ceph_osd_client *osdc,
872                                     struct ceph_osd_request *req)
873 {
874         dout("__register_linger_request %p\n", req);
875         list_add_tail(&req->r_linger_item, &osdc->req_linger);
876         list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
877 }
878
879 static void __unregister_linger_request(struct ceph_osd_client *osdc,
880                                         struct ceph_osd_request *req)
881 {
882         dout("__unregister_linger_request %p\n", req);
883         if (req->r_osd) {
884                 list_del_init(&req->r_linger_item);
885                 list_del_init(&req->r_linger_osd);
886
887                 if (list_empty(&req->r_osd->o_requests) &&
888                     list_empty(&req->r_osd->o_linger_requests)) {
889                         dout("moving osd to %p lru\n", req->r_osd);
890                         __move_osd_to_lru(osdc, req->r_osd);
891                 }
892                 if (list_empty(&req->r_osd_item))
893                         req->r_osd = NULL;
894         }
895 }
896
897 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
898                                          struct ceph_osd_request *req)
899 {
900         mutex_lock(&osdc->request_mutex);
901         if (req->r_linger) {
902                 __unregister_linger_request(osdc, req);
903                 ceph_osdc_put_request(req);
904         }
905         mutex_unlock(&osdc->request_mutex);
906 }
907 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
908
909 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
910                                   struct ceph_osd_request *req)
911 {
912         if (!req->r_linger) {
913                 dout("set_request_linger %p\n", req);
914                 req->r_linger = 1;
915                 /*
916                  * caller is now responsible for calling
917                  * unregister_linger_request
918                  */
919                 ceph_osdc_get_request(req);
920         }
921 }
922 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
923
924 /*
925  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
926  * (as needed), and set the request r_osd appropriately.  If there is
927  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
928  * (unsent, homeless) or leave on in-flight lru.
929  *
930  * Return 0 if unchanged, 1 if changed, or negative on error.
931  *
932  * Caller should hold map_sem for read and request_mutex.
933  */
934 static int __map_request(struct ceph_osd_client *osdc,
935                          struct ceph_osd_request *req)
936 {
937         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
938         struct ceph_pg pgid;
939         int acting[CEPH_PG_MAX_SIZE];
940         int o = -1, num = 0;
941         int err;
942
943         dout("map_request %p tid %lld\n", req, req->r_tid);
944         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
945                                       &req->r_file_layout, osdc->osdmap);
946         if (err) {
947                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
948                 return err;
949         }
950         pgid = reqhead->layout.ol_pgid;
951         req->r_pgid = pgid;
952
953         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
954         if (err > 0) {
955                 o = acting[0];
956                 num = err;
957         }
958
959         if ((req->r_osd && req->r_osd->o_osd == o &&
960              req->r_sent >= req->r_osd->o_incarnation &&
961              req->r_num_pg_osds == num &&
962              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
963             (req->r_osd == NULL && o == -1))
964                 return 0;  /* no change */
965
966         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
967              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
968              req->r_osd ? req->r_osd->o_osd : -1);
969
970         /* record full pg acting set */
971         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
972         req->r_num_pg_osds = num;
973
974         if (req->r_osd) {
975                 __cancel_request(req);
976                 list_del_init(&req->r_osd_item);
977                 req->r_osd = NULL;
978         }
979
980         req->r_osd = __lookup_osd(osdc, o);
981         if (!req->r_osd && o >= 0) {
982                 err = -ENOMEM;
983                 req->r_osd = create_osd(osdc);
984                 if (!req->r_osd) {
985                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
986                         goto out;
987                 }
988
989                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
990                 req->r_osd->o_osd = o;
991                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
992                 __insert_osd(osdc, req->r_osd);
993
994                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
995         }
996
997         if (req->r_osd) {
998                 __remove_osd_from_lru(req->r_osd);
999                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1000                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1001         } else {
1002                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1003         }
1004         err = 1;   /* osd or pg changed */
1005
1006 out:
1007         return err;
1008 }
1009
1010 /*
1011  * caller should hold map_sem (for read) and request_mutex
1012  */
1013 static int __send_request(struct ceph_osd_client *osdc,
1014                           struct ceph_osd_request *req)
1015 {
1016         struct ceph_osd_request_head *reqhead;
1017
1018         dout("send_request %p tid %llu to osd%d flags %d\n",
1019              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1020
1021         reqhead = req->r_request->front.iov_base;
1022         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1023         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
1024         reqhead->reassert_version = req->r_reassert_version;
1025
1026         req->r_stamp = jiffies;
1027         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1028
1029         ceph_msg_get(req->r_request); /* send consumes a ref */
1030         ceph_con_send(&req->r_osd->o_con, req->r_request);
1031         req->r_sent = req->r_osd->o_incarnation;
1032         return 0;
1033 }
1034
1035 /*
1036  * Send any requests in the queue (req_unsent).
1037  */
1038 static void send_queued(struct ceph_osd_client *osdc)
1039 {
1040         struct ceph_osd_request *req, *tmp;
1041
1042         dout("send_queued\n");
1043         mutex_lock(&osdc->request_mutex);
1044         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1045                 __send_request(osdc, req);
1046         }
1047         mutex_unlock(&osdc->request_mutex);
1048 }
1049
1050 /*
1051  * Timeout callback, called every N seconds when 1 or more osd
1052  * requests has been active for more than N seconds.  When this
1053  * happens, we ping all OSDs with requests who have timed out to
1054  * ensure any communications channel reset is detected.  Reset the
1055  * request timeouts another N seconds in the future as we go.
1056  * Reschedule the timeout event another N seconds in future (unless
1057  * there are no open requests).
1058  */
1059 static void handle_timeout(struct work_struct *work)
1060 {
1061         struct ceph_osd_client *osdc =
1062                 container_of(work, struct ceph_osd_client, timeout_work.work);
1063         struct ceph_osd_request *req, *last_req = NULL;
1064         struct ceph_osd *osd;
1065         unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1066         unsigned long keepalive =
1067                 osdc->client->options->osd_keepalive_timeout * HZ;
1068         unsigned long last_stamp = 0;
1069         struct list_head slow_osds;
1070         dout("timeout\n");
1071         down_read(&osdc->map_sem);
1072
1073         ceph_monc_request_next_osdmap(&osdc->client->monc);
1074
1075         mutex_lock(&osdc->request_mutex);
1076
1077         /*
1078          * reset osds that appear to be _really_ unresponsive.  this
1079          * is a failsafe measure.. we really shouldn't be getting to
1080          * this point if the system is working properly.  the monitors
1081          * should mark the osd as failed and we should find out about
1082          * it from an updated osd map.
1083          */
1084         while (timeout && !list_empty(&osdc->req_lru)) {
1085                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1086                                  r_req_lru_item);
1087
1088                 if (time_before(jiffies, req->r_stamp + timeout))
1089                         break;
1090
1091                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1092                 last_req = req;
1093                 last_stamp = req->r_stamp;
1094
1095                 osd = req->r_osd;
1096                 BUG_ON(!osd);
1097                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1098                            req->r_tid, osd->o_osd);
1099                 __kick_osd_requests(osdc, osd);
1100         }
1101
1102         /*
1103          * ping osds that are a bit slow.  this ensures that if there
1104          * is a break in the TCP connection we will notice, and reopen
1105          * a connection with that osd (from the fault callback).
1106          */
1107         INIT_LIST_HEAD(&slow_osds);
1108         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1109                 if (time_before(jiffies, req->r_stamp + keepalive))
1110                         break;
1111
1112                 osd = req->r_osd;
1113                 BUG_ON(!osd);
1114                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1115                      req->r_tid, osd->o_osd);
1116                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1117         }
1118         while (!list_empty(&slow_osds)) {
1119                 osd = list_entry(slow_osds.next, struct ceph_osd,
1120                                  o_keepalive_item);
1121                 list_del_init(&osd->o_keepalive_item);
1122                 ceph_con_keepalive(&osd->o_con);
1123         }
1124
1125         __schedule_osd_timeout(osdc);
1126         mutex_unlock(&osdc->request_mutex);
1127         send_queued(osdc);
1128         up_read(&osdc->map_sem);
1129 }
1130
1131 static void handle_osds_timeout(struct work_struct *work)
1132 {
1133         struct ceph_osd_client *osdc =
1134                 container_of(work, struct ceph_osd_client,
1135                              osds_timeout_work.work);
1136         unsigned long delay =
1137                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1138
1139         dout("osds timeout\n");
1140         down_read(&osdc->map_sem);
1141         remove_old_osds(osdc, 0);
1142         up_read(&osdc->map_sem);
1143
1144         schedule_delayed_work(&osdc->osds_timeout_work,
1145                               round_jiffies_relative(delay));
1146 }
1147
1148 static void complete_request(struct ceph_osd_request *req)
1149 {
1150         if (req->r_safe_callback)
1151                 req->r_safe_callback(req, NULL);
1152         complete_all(&req->r_safe_completion);  /* fsync waiter */
1153 }
1154
1155 /*
1156  * handle osd op reply.  either call the callback if it is specified,
1157  * or do the completion to wake up the waiting thread.
1158  */
1159 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1160                          struct ceph_connection *con)
1161 {
1162         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1163         struct ceph_osd_request *req;
1164         u64 tid;
1165         int numops, object_len, flags;
1166         s32 result;
1167
1168         tid = le64_to_cpu(msg->hdr.tid);
1169         if (msg->front.iov_len < sizeof(*rhead))
1170                 goto bad;
1171         numops = le32_to_cpu(rhead->num_ops);
1172         object_len = le32_to_cpu(rhead->object_len);
1173         result = le32_to_cpu(rhead->result);
1174         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1175             numops * sizeof(struct ceph_osd_op))
1176                 goto bad;
1177         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1178         /* lookup */
1179         mutex_lock(&osdc->request_mutex);
1180         req = __lookup_request(osdc, tid);
1181         if (req == NULL) {
1182                 dout("handle_reply tid %llu dne\n", tid);
1183                 mutex_unlock(&osdc->request_mutex);
1184                 return;
1185         }
1186         ceph_osdc_get_request(req);
1187         flags = le32_to_cpu(rhead->flags);
1188
1189         /*
1190          * if this connection filled our message, drop our reference now, to
1191          * avoid a (safe but slower) revoke later.
1192          */
1193         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1194                 dout(" dropping con_filling_msg ref %p\n", con);
1195                 req->r_con_filling_msg = NULL;
1196                 ceph_con_put(con);
1197         }
1198
1199         if (!req->r_got_reply) {
1200                 unsigned bytes;
1201
1202                 req->r_result = le32_to_cpu(rhead->result);
1203                 bytes = le32_to_cpu(msg->hdr.data_len);
1204                 dout("handle_reply result %d bytes %d\n", req->r_result,
1205                      bytes);
1206                 if (req->r_result == 0)
1207                         req->r_result = bytes;
1208
1209                 /* in case this is a write and we need to replay, */
1210                 req->r_reassert_version = rhead->reassert_version;
1211
1212                 req->r_got_reply = 1;
1213         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1214                 dout("handle_reply tid %llu dup ack\n", tid);
1215                 mutex_unlock(&osdc->request_mutex);
1216                 goto done;
1217         }
1218
1219         dout("handle_reply tid %llu flags %d\n", tid, flags);
1220
1221         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1222                 __register_linger_request(osdc, req);
1223
1224         /* either this is a read, or we got the safe response */
1225         if (result < 0 ||
1226             (flags & CEPH_OSD_FLAG_ONDISK) ||
1227             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1228                 __unregister_request(osdc, req);
1229
1230         mutex_unlock(&osdc->request_mutex);
1231
1232         if (req->r_callback)
1233                 req->r_callback(req, msg);
1234         else
1235                 complete_all(&req->r_completion);
1236
1237         if (flags & CEPH_OSD_FLAG_ONDISK)
1238                 complete_request(req);
1239
1240 done:
1241         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1242         ceph_osdc_put_request(req);
1243         return;
1244
1245 bad:
1246         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1247                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1248                (int)sizeof(*rhead));
1249         ceph_msg_dump(msg);
1250 }
1251
1252 static void reset_changed_osds(struct ceph_osd_client *osdc)
1253 {
1254         struct rb_node *p, *n;
1255
1256         for (p = rb_first(&osdc->osds); p; p = n) {
1257                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1258
1259                 n = rb_next(p);
1260                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1261                     memcmp(&osd->o_con.peer_addr,
1262                            ceph_osd_addr(osdc->osdmap,
1263                                          osd->o_osd),
1264                            sizeof(struct ceph_entity_addr)) != 0)
1265                         __reset_osd(osdc, osd);
1266         }
1267 }
1268
1269 /*
1270  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1271  * no osd, request a new map.
1272  *
1273  * Caller should hold map_sem for read and request_mutex.
1274  */
1275 static void kick_requests(struct ceph_osd_client *osdc)
1276 {
1277         struct ceph_osd_request *req, *nreq;
1278         struct rb_node *p;
1279         int needmap = 0;
1280         int err;
1281
1282         dout("kick_requests\n");
1283         mutex_lock(&osdc->request_mutex);
1284         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1285                 req = rb_entry(p, struct ceph_osd_request, r_node);
1286                 err = __map_request(osdc, req);
1287                 if (err < 0)
1288                         continue;  /* error */
1289                 if (req->r_osd == NULL) {
1290                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1291                         needmap++;  /* request a newer map */
1292                 } else if (err > 0) {
1293                         dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1294                              req->r_osd ? req->r_osd->o_osd : -1);
1295                         if (!req->r_linger)
1296                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1297                 }
1298         }
1299
1300         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1301                                  r_linger_item) {
1302                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1303
1304                 err = __map_request(osdc, req);
1305                 if (err == 0)
1306                         continue;  /* no change and no osd was specified */
1307                 if (err < 0)
1308                         continue;  /* hrm! */
1309                 if (req->r_osd == NULL) {
1310                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1311                         needmap++;  /* request a newer map */
1312                         continue;
1313                 }
1314
1315                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1316                      req->r_osd ? req->r_osd->o_osd : -1);
1317                 __unregister_linger_request(osdc, req);
1318                 __register_request(osdc, req);
1319         }
1320         mutex_unlock(&osdc->request_mutex);
1321
1322         if (needmap) {
1323                 dout("%d requests for down osds, need new map\n", needmap);
1324                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1325         }
1326 }
1327
1328
1329 /*
1330  * Process updated osd map.
1331  *
1332  * The message contains any number of incremental and full maps, normally
1333  * indicating some sort of topology change in the cluster.  Kick requests
1334  * off to different OSDs as needed.
1335  */
1336 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1337 {
1338         void *p, *end, *next;
1339         u32 nr_maps, maplen;
1340         u32 epoch;
1341         struct ceph_osdmap *newmap = NULL, *oldmap;
1342         int err;
1343         struct ceph_fsid fsid;
1344
1345         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1346         p = msg->front.iov_base;
1347         end = p + msg->front.iov_len;
1348
1349         /* verify fsid */
1350         ceph_decode_need(&p, end, sizeof(fsid), bad);
1351         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1352         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1353                 return;
1354
1355         down_write(&osdc->map_sem);
1356
1357         /* incremental maps */
1358         ceph_decode_32_safe(&p, end, nr_maps, bad);
1359         dout(" %d inc maps\n", nr_maps);
1360         while (nr_maps > 0) {
1361                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1362                 epoch = ceph_decode_32(&p);
1363                 maplen = ceph_decode_32(&p);
1364                 ceph_decode_need(&p, end, maplen, bad);
1365                 next = p + maplen;
1366                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1367                         dout("applying incremental map %u len %d\n",
1368                              epoch, maplen);
1369                         newmap = osdmap_apply_incremental(&p, next,
1370                                                           osdc->osdmap,
1371                                                           osdc->client->msgr);
1372                         if (IS_ERR(newmap)) {
1373                                 err = PTR_ERR(newmap);
1374                                 goto bad;
1375                         }
1376                         BUG_ON(!newmap);
1377                         if (newmap != osdc->osdmap) {
1378                                 ceph_osdmap_destroy(osdc->osdmap);
1379                                 osdc->osdmap = newmap;
1380                         }
1381                         kick_requests(osdc);
1382                         reset_changed_osds(osdc);
1383                 } else {
1384                         dout("ignoring incremental map %u len %d\n",
1385                              epoch, maplen);
1386                 }
1387                 p = next;
1388                 nr_maps--;
1389         }
1390         if (newmap)
1391                 goto done;
1392
1393         /* full maps */
1394         ceph_decode_32_safe(&p, end, nr_maps, bad);
1395         dout(" %d full maps\n", nr_maps);
1396         while (nr_maps) {
1397                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1398                 epoch = ceph_decode_32(&p);
1399                 maplen = ceph_decode_32(&p);
1400                 ceph_decode_need(&p, end, maplen, bad);
1401                 if (nr_maps > 1) {
1402                         dout("skipping non-latest full map %u len %d\n",
1403                              epoch, maplen);
1404                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1405                         dout("skipping full map %u len %d, "
1406                              "older than our %u\n", epoch, maplen,
1407                              osdc->osdmap->epoch);
1408                 } else {
1409                         dout("taking full map %u len %d\n", epoch, maplen);
1410                         newmap = osdmap_decode(&p, p+maplen);
1411                         if (IS_ERR(newmap)) {
1412                                 err = PTR_ERR(newmap);
1413                                 goto bad;
1414                         }
1415                         BUG_ON(!newmap);
1416                         oldmap = osdc->osdmap;
1417                         osdc->osdmap = newmap;
1418                         if (oldmap)
1419                                 ceph_osdmap_destroy(oldmap);
1420                         kick_requests(osdc);
1421                 }
1422                 p += maplen;
1423                 nr_maps--;
1424         }
1425
1426 done:
1427         downgrade_write(&osdc->map_sem);
1428         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1429
1430         /*
1431          * subscribe to subsequent osdmap updates if full to ensure
1432          * we find out when we are no longer full and stop returning
1433          * ENOSPC.
1434          */
1435         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1436                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1437
1438         send_queued(osdc);
1439         up_read(&osdc->map_sem);
1440         wake_up_all(&osdc->client->auth_wq);
1441         return;
1442
1443 bad:
1444         pr_err("osdc handle_map corrupt msg\n");
1445         ceph_msg_dump(msg);
1446         up_write(&osdc->map_sem);
1447         return;
1448 }
1449
1450 /*
1451  * watch/notify callback event infrastructure
1452  *
1453  * These callbacks are used both for watch and notify operations.
1454  */
1455 static void __release_event(struct kref *kref)
1456 {
1457         struct ceph_osd_event *event =
1458                 container_of(kref, struct ceph_osd_event, kref);
1459
1460         dout("__release_event %p\n", event);
1461         kfree(event);
1462 }
1463
1464 static void get_event(struct ceph_osd_event *event)
1465 {
1466         kref_get(&event->kref);
1467 }
1468
1469 void ceph_osdc_put_event(struct ceph_osd_event *event)
1470 {
1471         kref_put(&event->kref, __release_event);
1472 }
1473 EXPORT_SYMBOL(ceph_osdc_put_event);
1474
1475 static void __insert_event(struct ceph_osd_client *osdc,
1476                              struct ceph_osd_event *new)
1477 {
1478         struct rb_node **p = &osdc->event_tree.rb_node;
1479         struct rb_node *parent = NULL;
1480         struct ceph_osd_event *event = NULL;
1481
1482         while (*p) {
1483                 parent = *p;
1484                 event = rb_entry(parent, struct ceph_osd_event, node);
1485                 if (new->cookie < event->cookie)
1486                         p = &(*p)->rb_left;
1487                 else if (new->cookie > event->cookie)
1488                         p = &(*p)->rb_right;
1489                 else
1490                         BUG();
1491         }
1492
1493         rb_link_node(&new->node, parent, p);
1494         rb_insert_color(&new->node, &osdc->event_tree);
1495 }
1496
1497 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1498                                                 u64 cookie)
1499 {
1500         struct rb_node **p = &osdc->event_tree.rb_node;
1501         struct rb_node *parent = NULL;
1502         struct ceph_osd_event *event = NULL;
1503
1504         while (*p) {
1505                 parent = *p;
1506                 event = rb_entry(parent, struct ceph_osd_event, node);
1507                 if (cookie < event->cookie)
1508                         p = &(*p)->rb_left;
1509                 else if (cookie > event->cookie)
1510                         p = &(*p)->rb_right;
1511                 else
1512                         return event;
1513         }
1514         return NULL;
1515 }
1516
1517 static void __remove_event(struct ceph_osd_event *event)
1518 {
1519         struct ceph_osd_client *osdc = event->osdc;
1520
1521         if (!RB_EMPTY_NODE(&event->node)) {
1522                 dout("__remove_event removed %p\n", event);
1523                 rb_erase(&event->node, &osdc->event_tree);
1524                 ceph_osdc_put_event(event);
1525         } else {
1526                 dout("__remove_event didn't remove %p\n", event);
1527         }
1528 }
1529
1530 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1531                            void (*event_cb)(u64, u64, u8, void *),
1532                            int one_shot, void *data,
1533                            struct ceph_osd_event **pevent)
1534 {
1535         struct ceph_osd_event *event;
1536
1537         event = kmalloc(sizeof(*event), GFP_NOIO);
1538         if (!event)
1539                 return -ENOMEM;
1540
1541         dout("create_event %p\n", event);
1542         event->cb = event_cb;
1543         event->one_shot = one_shot;
1544         event->data = data;
1545         event->osdc = osdc;
1546         INIT_LIST_HEAD(&event->osd_node);
1547         kref_init(&event->kref);   /* one ref for us */
1548         kref_get(&event->kref);    /* one ref for the caller */
1549         init_completion(&event->completion);
1550
1551         spin_lock(&osdc->event_lock);
1552         event->cookie = ++osdc->event_count;
1553         __insert_event(osdc, event);
1554         spin_unlock(&osdc->event_lock);
1555
1556         *pevent = event;
1557         return 0;
1558 }
1559 EXPORT_SYMBOL(ceph_osdc_create_event);
1560
1561 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1562 {
1563         struct ceph_osd_client *osdc = event->osdc;
1564
1565         dout("cancel_event %p\n", event);
1566         spin_lock(&osdc->event_lock);
1567         __remove_event(event);
1568         spin_unlock(&osdc->event_lock);
1569         ceph_osdc_put_event(event); /* caller's */
1570 }
1571 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1572
1573
1574 static void do_event_work(struct work_struct *work)
1575 {
1576         struct ceph_osd_event_work *event_work =
1577                 container_of(work, struct ceph_osd_event_work, work);
1578         struct ceph_osd_event *event = event_work->event;
1579         u64 ver = event_work->ver;
1580         u64 notify_id = event_work->notify_id;
1581         u8 opcode = event_work->opcode;
1582
1583         dout("do_event_work completing %p\n", event);
1584         event->cb(ver, notify_id, opcode, event->data);
1585         complete(&event->completion);
1586         dout("do_event_work completed %p\n", event);
1587         ceph_osdc_put_event(event);
1588         kfree(event_work);
1589 }
1590
1591
1592 /*
1593  * Process osd watch notifications
1594  */
1595 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1596 {
1597         void *p, *end;
1598         u8 proto_ver;
1599         u64 cookie, ver, notify_id;
1600         u8 opcode;
1601         struct ceph_osd_event *event;
1602         struct ceph_osd_event_work *event_work;
1603
1604         p = msg->front.iov_base;
1605         end = p + msg->front.iov_len;
1606
1607         ceph_decode_8_safe(&p, end, proto_ver, bad);
1608         ceph_decode_8_safe(&p, end, opcode, bad);
1609         ceph_decode_64_safe(&p, end, cookie, bad);
1610         ceph_decode_64_safe(&p, end, ver, bad);
1611         ceph_decode_64_safe(&p, end, notify_id, bad);
1612
1613         spin_lock(&osdc->event_lock);
1614         event = __find_event(osdc, cookie);
1615         if (event) {
1616                 get_event(event);
1617                 if (event->one_shot)
1618                         __remove_event(event);
1619         }
1620         spin_unlock(&osdc->event_lock);
1621         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1622              cookie, ver, event);
1623         if (event) {
1624                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1625                 if (!event_work) {
1626                         dout("ERROR: could not allocate event_work\n");
1627                         goto done_err;
1628                 }
1629                 INIT_WORK(&event_work->work, do_event_work);
1630                 event_work->event = event;
1631                 event_work->ver = ver;
1632                 event_work->notify_id = notify_id;
1633                 event_work->opcode = opcode;
1634                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1635                         dout("WARNING: failed to queue notify event work\n");
1636                         goto done_err;
1637                 }
1638         }
1639
1640         return;
1641
1642 done_err:
1643         complete(&event->completion);
1644         ceph_osdc_put_event(event);
1645         return;
1646
1647 bad:
1648         pr_err("osdc handle_watch_notify corrupt msg\n");
1649         return;
1650 }
1651
1652 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1653 {
1654         int err;
1655
1656         dout("wait_event %p\n", event);
1657         err = wait_for_completion_interruptible_timeout(&event->completion,
1658                                                         timeout * HZ);
1659         ceph_osdc_put_event(event);
1660         if (err > 0)
1661                 err = 0;
1662         dout("wait_event %p returns %d\n", event, err);
1663         return err;
1664 }
1665 EXPORT_SYMBOL(ceph_osdc_wait_event);
1666
1667 /*
1668  * Register request, send initial attempt.
1669  */
1670 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1671                             struct ceph_osd_request *req,
1672                             bool nofail)
1673 {
1674         int rc = 0;
1675
1676         req->r_request->pages = req->r_pages;
1677         req->r_request->nr_pages = req->r_num_pages;
1678 #ifdef CONFIG_BLOCK
1679         req->r_request->bio = req->r_bio;
1680 #endif
1681         req->r_request->trail = req->r_trail;
1682
1683         register_request(osdc, req);
1684
1685         down_read(&osdc->map_sem);
1686         mutex_lock(&osdc->request_mutex);
1687         /*
1688          * a racing kick_requests() may have sent the message for us
1689          * while we dropped request_mutex above, so only send now if
1690          * the request still han't been touched yet.
1691          */
1692         if (req->r_sent == 0) {
1693                 rc = __map_request(osdc, req);
1694                 if (rc < 0) {
1695                         if (nofail) {
1696                                 dout("osdc_start_request failed map, "
1697                                      " will retry %lld\n", req->r_tid);
1698                                 rc = 0;
1699                         }
1700                         goto out_unlock;
1701                 }
1702                 if (req->r_osd == NULL) {
1703                         dout("send_request %p no up osds in pg\n", req);
1704                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1705                 } else {
1706                         rc = __send_request(osdc, req);
1707                         if (rc) {
1708                                 if (nofail) {
1709                                         dout("osdc_start_request failed send, "
1710                                              " will retry %lld\n", req->r_tid);
1711                                         rc = 0;
1712                                 } else {
1713                                         __unregister_request(osdc, req);
1714                                 }
1715                         }
1716                 }
1717         }
1718
1719 out_unlock:
1720         mutex_unlock(&osdc->request_mutex);
1721         up_read(&osdc->map_sem);
1722         return rc;
1723 }
1724 EXPORT_SYMBOL(ceph_osdc_start_request);
1725
1726 /*
1727  * wait for a request to complete
1728  */
1729 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1730                            struct ceph_osd_request *req)
1731 {
1732         int rc;
1733
1734         rc = wait_for_completion_interruptible(&req->r_completion);
1735         if (rc < 0) {
1736                 mutex_lock(&osdc->request_mutex);
1737                 __cancel_request(req);
1738                 __unregister_request(osdc, req);
1739                 mutex_unlock(&osdc->request_mutex);
1740                 complete_request(req);
1741                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1742                 return rc;
1743         }
1744
1745         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1746         return req->r_result;
1747 }
1748 EXPORT_SYMBOL(ceph_osdc_wait_request);
1749
1750 /*
1751  * sync - wait for all in-flight requests to flush.  avoid starvation.
1752  */
1753 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1754 {
1755         struct ceph_osd_request *req;
1756         u64 last_tid, next_tid = 0;
1757
1758         mutex_lock(&osdc->request_mutex);
1759         last_tid = osdc->last_tid;
1760         while (1) {
1761                 req = __lookup_request_ge(osdc, next_tid);
1762                 if (!req)
1763                         break;
1764                 if (req->r_tid > last_tid)
1765                         break;
1766
1767                 next_tid = req->r_tid + 1;
1768                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1769                         continue;
1770
1771                 ceph_osdc_get_request(req);
1772                 mutex_unlock(&osdc->request_mutex);
1773                 dout("sync waiting on tid %llu (last is %llu)\n",
1774                      req->r_tid, last_tid);
1775                 wait_for_completion(&req->r_safe_completion);
1776                 mutex_lock(&osdc->request_mutex);
1777                 ceph_osdc_put_request(req);
1778         }
1779         mutex_unlock(&osdc->request_mutex);
1780         dout("sync done (thru tid %llu)\n", last_tid);
1781 }
1782 EXPORT_SYMBOL(ceph_osdc_sync);
1783
1784 /*
1785  * init, shutdown
1786  */
1787 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1788 {
1789         int err;
1790
1791         dout("init\n");
1792         osdc->client = client;
1793         osdc->osdmap = NULL;
1794         init_rwsem(&osdc->map_sem);
1795         init_completion(&osdc->map_waiters);
1796         osdc->last_requested_map = 0;
1797         mutex_init(&osdc->request_mutex);
1798         osdc->last_tid = 0;
1799         osdc->osds = RB_ROOT;
1800         INIT_LIST_HEAD(&osdc->osd_lru);
1801         osdc->requests = RB_ROOT;
1802         INIT_LIST_HEAD(&osdc->req_lru);
1803         INIT_LIST_HEAD(&osdc->req_unsent);
1804         INIT_LIST_HEAD(&osdc->req_notarget);
1805         INIT_LIST_HEAD(&osdc->req_linger);
1806         osdc->num_requests = 0;
1807         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1808         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1809         spin_lock_init(&osdc->event_lock);
1810         osdc->event_tree = RB_ROOT;
1811         osdc->event_count = 0;
1812
1813         schedule_delayed_work(&osdc->osds_timeout_work,
1814            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1815
1816         err = -ENOMEM;
1817         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1818                                         sizeof(struct ceph_osd_request));
1819         if (!osdc->req_mempool)
1820                 goto out;
1821
1822         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1823                                 "osd_op");
1824         if (err < 0)
1825                 goto out_mempool;
1826         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1827                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1828                                 "osd_op_reply");
1829         if (err < 0)
1830                 goto out_msgpool;
1831
1832         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1833         if (IS_ERR(osdc->notify_wq)) {
1834                 err = PTR_ERR(osdc->notify_wq);
1835                 osdc->notify_wq = NULL;
1836                 goto out_msgpool;
1837         }
1838         return 0;
1839
1840 out_msgpool:
1841         ceph_msgpool_destroy(&osdc->msgpool_op);
1842 out_mempool:
1843         mempool_destroy(osdc->req_mempool);
1844 out:
1845         return err;
1846 }
1847 EXPORT_SYMBOL(ceph_osdc_init);
1848
1849 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1850 {
1851         flush_workqueue(osdc->notify_wq);
1852         destroy_workqueue(osdc->notify_wq);
1853         cancel_delayed_work_sync(&osdc->timeout_work);
1854         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1855         if (osdc->osdmap) {
1856                 ceph_osdmap_destroy(osdc->osdmap);
1857                 osdc->osdmap = NULL;
1858         }
1859         remove_old_osds(osdc, 1);
1860         WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
1861         mempool_destroy(osdc->req_mempool);
1862         ceph_msgpool_destroy(&osdc->msgpool_op);
1863         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1864 }
1865 EXPORT_SYMBOL(ceph_osdc_stop);
1866
1867 /*
1868  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1869  * *plen.  Return number of bytes read, or error.
1870  */
1871 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1872                         struct ceph_vino vino, struct ceph_file_layout *layout,
1873                         u64 off, u64 *plen,
1874                         u32 truncate_seq, u64 truncate_size,
1875                         struct page **pages, int num_pages, int page_align)
1876 {
1877         struct ceph_osd_request *req;
1878         int rc = 0;
1879
1880         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1881              vino.snap, off, *plen);
1882         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1883                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1884                                     NULL, 0, truncate_seq, truncate_size, NULL,
1885                                     false, 1, page_align);
1886         if (!req)
1887                 return -ENOMEM;
1888
1889         /* it may be a short read due to an object boundary */
1890         req->r_pages = pages;
1891
1892         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1893              off, *plen, req->r_num_pages, page_align);
1894
1895         rc = ceph_osdc_start_request(osdc, req, false);
1896         if (!rc)
1897                 rc = ceph_osdc_wait_request(osdc, req);
1898
1899         ceph_osdc_put_request(req);
1900         dout("readpages result %d\n", rc);
1901         return rc;
1902 }
1903 EXPORT_SYMBOL(ceph_osdc_readpages);
1904
1905 /*
1906  * do a synchronous write on N pages
1907  */
1908 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1909                          struct ceph_file_layout *layout,
1910                          struct ceph_snap_context *snapc,
1911                          u64 off, u64 len,
1912                          u32 truncate_seq, u64 truncate_size,
1913                          struct timespec *mtime,
1914                          struct page **pages, int num_pages,
1915                          int flags, int do_sync, bool nofail)
1916 {
1917         struct ceph_osd_request *req;
1918         int rc = 0;
1919         int page_align = off & ~PAGE_MASK;
1920
1921         BUG_ON(vino.snap != CEPH_NOSNAP);
1922         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1923                                     CEPH_OSD_OP_WRITE,
1924                                     flags | CEPH_OSD_FLAG_ONDISK |
1925                                             CEPH_OSD_FLAG_WRITE,
1926                                     snapc, do_sync,
1927                                     truncate_seq, truncate_size, mtime,
1928                                     nofail, 1, page_align);
1929         if (!req)
1930                 return -ENOMEM;
1931
1932         /* it may be a short write due to an object boundary */
1933         req->r_pages = pages;
1934         dout("writepages %llu~%llu (%d pages)\n", off, len,
1935              req->r_num_pages);
1936
1937         rc = ceph_osdc_start_request(osdc, req, nofail);
1938         if (!rc)
1939                 rc = ceph_osdc_wait_request(osdc, req);
1940
1941         ceph_osdc_put_request(req);
1942         if (rc == 0)
1943                 rc = len;
1944         dout("writepages result %d\n", rc);
1945         return rc;
1946 }
1947 EXPORT_SYMBOL(ceph_osdc_writepages);
1948
1949 /*
1950  * handle incoming message
1951  */
1952 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1953 {
1954         struct ceph_osd *osd = con->private;
1955         struct ceph_osd_client *osdc;
1956         int type = le16_to_cpu(msg->hdr.type);
1957
1958         if (!osd)
1959                 goto out;
1960         osdc = osd->o_osdc;
1961
1962         switch (type) {
1963         case CEPH_MSG_OSD_MAP:
1964                 ceph_osdc_handle_map(osdc, msg);
1965                 break;
1966         case CEPH_MSG_OSD_OPREPLY:
1967                 handle_reply(osdc, msg, con);
1968                 break;
1969         case CEPH_MSG_WATCH_NOTIFY:
1970                 handle_watch_notify(osdc, msg);
1971                 break;
1972
1973         default:
1974                 pr_err("received unknown message type %d %s\n", type,
1975                        ceph_msg_type_name(type));
1976         }
1977 out:
1978         ceph_msg_put(msg);
1979 }
1980
1981 /*
1982  * lookup and return message for incoming reply.  set up reply message
1983  * pages.
1984  */
1985 static struct ceph_msg *get_reply(struct ceph_connection *con,
1986                                   struct ceph_msg_header *hdr,
1987                                   int *skip)
1988 {
1989         struct ceph_osd *osd = con->private;
1990         struct ceph_osd_client *osdc = osd->o_osdc;
1991         struct ceph_msg *m;
1992         struct ceph_osd_request *req;
1993         int front = le32_to_cpu(hdr->front_len);
1994         int data_len = le32_to_cpu(hdr->data_len);
1995         u64 tid;
1996
1997         tid = le64_to_cpu(hdr->tid);
1998         mutex_lock(&osdc->request_mutex);
1999         req = __lookup_request(osdc, tid);
2000         if (!req) {
2001                 *skip = 1;
2002                 m = NULL;
2003                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2004                         osd->o_osd);
2005                 goto out;
2006         }
2007
2008         if (req->r_con_filling_msg) {
2009                 dout("get_reply revoking msg %p from old con %p\n",
2010                      req->r_reply, req->r_con_filling_msg);
2011                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2012                 ceph_con_put(req->r_con_filling_msg);
2013                 req->r_con_filling_msg = NULL;
2014         }
2015
2016         if (front > req->r_reply->front.iov_len) {
2017                 pr_warning("get_reply front %d > preallocated %d\n",
2018                            front, (int)req->r_reply->front.iov_len);
2019                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
2020                 if (!m)
2021                         goto out;
2022                 ceph_msg_put(req->r_reply);
2023                 req->r_reply = m;
2024         }
2025         m = ceph_msg_get(req->r_reply);
2026
2027         if (data_len > 0) {
2028                 int want = calc_pages_for(req->r_page_alignment, data_len);
2029
2030                 if (unlikely(req->r_num_pages < want)) {
2031                         pr_warning("tid %lld reply has %d bytes %d pages, we"
2032                                    " had only %d pages ready\n", tid, data_len,
2033                                    want, req->r_num_pages);
2034                         *skip = 1;
2035                         ceph_msg_put(m);
2036                         m = NULL;
2037                         goto out;
2038                 }
2039                 m->pages = req->r_pages;
2040                 m->nr_pages = req->r_num_pages;
2041                 m->page_alignment = req->r_page_alignment;
2042 #ifdef CONFIG_BLOCK
2043                 m->bio = req->r_bio;
2044 #endif
2045         }
2046         *skip = 0;
2047         req->r_con_filling_msg = ceph_con_get(con);
2048         dout("get_reply tid %lld %p\n", tid, m);
2049
2050 out:
2051         mutex_unlock(&osdc->request_mutex);
2052         return m;
2053
2054 }
2055
2056 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2057                                   struct ceph_msg_header *hdr,
2058                                   int *skip)
2059 {
2060         struct ceph_osd *osd = con->private;
2061         int type = le16_to_cpu(hdr->type);
2062         int front = le32_to_cpu(hdr->front_len);
2063
2064         switch (type) {
2065         case CEPH_MSG_OSD_MAP:
2066         case CEPH_MSG_WATCH_NOTIFY:
2067                 return ceph_msg_new(type, front, GFP_NOFS);
2068         case CEPH_MSG_OSD_OPREPLY:
2069                 return get_reply(con, hdr, skip);
2070         default:
2071                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2072                         osd->o_osd);
2073                 *skip = 1;
2074                 return NULL;
2075         }
2076 }
2077
2078 /*
2079  * Wrappers to refcount containing ceph_osd struct
2080  */
2081 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2082 {
2083         struct ceph_osd *osd = con->private;
2084         if (get_osd(osd))
2085                 return con;
2086         return NULL;
2087 }
2088
2089 static void put_osd_con(struct ceph_connection *con)
2090 {
2091         struct ceph_osd *osd = con->private;
2092         put_osd(osd);
2093 }
2094
2095 /*
2096  * authentication
2097  */
2098 static int get_authorizer(struct ceph_connection *con,
2099                           void **buf, int *len, int *proto,
2100                           void **reply_buf, int *reply_len, int force_new)
2101 {
2102         struct ceph_osd *o = con->private;
2103         struct ceph_osd_client *osdc = o->o_osdc;
2104         struct ceph_auth_client *ac = osdc->client->monc.auth;
2105         int ret = 0;
2106
2107         if (force_new && o->o_authorizer) {
2108                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2109                 o->o_authorizer = NULL;
2110         }
2111         if (o->o_authorizer == NULL) {
2112                 ret = ac->ops->create_authorizer(
2113                         ac, CEPH_ENTITY_TYPE_OSD,
2114                         &o->o_authorizer,
2115                         &o->o_authorizer_buf,
2116                         &o->o_authorizer_buf_len,
2117                         &o->o_authorizer_reply_buf,
2118                         &o->o_authorizer_reply_buf_len);
2119                 if (ret)
2120                         return ret;
2121         }
2122
2123         *proto = ac->protocol;
2124         *buf = o->o_authorizer_buf;
2125         *len = o->o_authorizer_buf_len;
2126         *reply_buf = o->o_authorizer_reply_buf;
2127         *reply_len = o->o_authorizer_reply_buf_len;
2128         return 0;
2129 }
2130
2131
2132 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2133 {
2134         struct ceph_osd *o = con->private;
2135         struct ceph_osd_client *osdc = o->o_osdc;
2136         struct ceph_auth_client *ac = osdc->client->monc.auth;
2137
2138         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2139 }
2140
2141 static int invalidate_authorizer(struct ceph_connection *con)
2142 {
2143         struct ceph_osd *o = con->private;
2144         struct ceph_osd_client *osdc = o->o_osdc;
2145         struct ceph_auth_client *ac = osdc->client->monc.auth;
2146
2147         if (ac->ops->invalidate_authorizer)
2148                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2149
2150         return ceph_monc_validate_auth(&osdc->client->monc);
2151 }
2152
2153 static const struct ceph_connection_operations osd_con_ops = {
2154         .get = get_osd_con,
2155         .put = put_osd_con,
2156         .dispatch = dispatch,
2157         .get_authorizer = get_authorizer,
2158         .verify_authorizer_reply = verify_authorizer_reply,
2159         .invalidate_authorizer = invalidate_authorizer,
2160         .alloc_msg = alloc_msg,
2161         .fault = osd_reset,
2162 };