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Add linux-next specific files for 20110817
[linux-2.6/next.git] / net / ceph / osd_client.c
blob9276c32a78dc04ed749d10954288536cc14170f2
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, true);
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, true);
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 /* hasn't been long enough since we sent it? */
1089 if (time_before(jiffies, req->r_stamp + timeout))
1090 break;
1091
1092 /* hasn't been long enough since it was acked? */
1093 if (req->r_request->ack_stamp == 0 ||
1094 time_before(jiffies, req->r_request->ack_stamp + timeout))
1095 break;
1096
1097 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1098 last_req = req;
1099 last_stamp = req->r_stamp;
1100
1101 osd = req->r_osd;
1102 BUG_ON(!osd);
1103 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1104 req->r_tid, osd->o_osd);
1105 __kick_osd_requests(osdc, osd);
1106 }
1107
1108 /*
1109 * ping osds that are a bit slow. this ensures that if there
1110 * is a break in the TCP connection we will notice, and reopen
1111 * a connection with that osd (from the fault callback).
1112 */
1113 INIT_LIST_HEAD(&slow_osds);
1114 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1115 if (time_before(jiffies, req->r_stamp + keepalive))
1116 break;
1117
1118 osd = req->r_osd;
1119 BUG_ON(!osd);
1120 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1121 req->r_tid, osd->o_osd);
1122 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1123 }
1124 while (!list_empty(&slow_osds)) {
1125 osd = list_entry(slow_osds.next, struct ceph_osd,
1126 o_keepalive_item);
1127 list_del_init(&osd->o_keepalive_item);
1128 ceph_con_keepalive(&osd->o_con);
1129 }
1130
1131 __schedule_osd_timeout(osdc);
1132 mutex_unlock(&osdc->request_mutex);
1133 send_queued(osdc);
1134 up_read(&osdc->map_sem);
1135 }
1136
1137 static void handle_osds_timeout(struct work_struct *work)
1138 {
1139 struct ceph_osd_client *osdc =
1140 container_of(work, struct ceph_osd_client,
1141 osds_timeout_work.work);
1142 unsigned long delay =
1143 osdc->client->options->osd_idle_ttl * HZ >> 2;
1144
1145 dout("osds timeout\n");
1146 down_read(&osdc->map_sem);
1147 remove_old_osds(osdc, 0);
1148 up_read(&osdc->map_sem);
1149
1150 schedule_delayed_work(&osdc->osds_timeout_work,
1151 round_jiffies_relative(delay));
1152 }
1153
1154 static void complete_request(struct ceph_osd_request *req)
1155 {
1156 if (req->r_safe_callback)
1157 req->r_safe_callback(req, NULL);
1158 complete_all(&req->r_safe_completion); /* fsync waiter */
1159 }
1160
1161 /*
1162 * handle osd op reply. either call the callback if it is specified,
1163 * or do the completion to wake up the waiting thread.
1164 */
1165 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1166 struct ceph_connection *con)
1167 {
1168 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1169 struct ceph_osd_request *req;
1170 u64 tid;
1171 int numops, object_len, flags;
1172 s32 result;
1173
1174 tid = le64_to_cpu(msg->hdr.tid);
1175 if (msg->front.iov_len < sizeof(*rhead))
1176 goto bad;
1177 numops = le32_to_cpu(rhead->num_ops);
1178 object_len = le32_to_cpu(rhead->object_len);
1179 result = le32_to_cpu(rhead->result);
1180 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1181 numops * sizeof(struct ceph_osd_op))
1182 goto bad;
1183 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1184 /* lookup */
1185 mutex_lock(&osdc->request_mutex);
1186 req = __lookup_request(osdc, tid);
1187 if (req == NULL) {
1188 dout("handle_reply tid %llu dne\n", tid);
1189 mutex_unlock(&osdc->request_mutex);
1190 return;
1191 }
1192 ceph_osdc_get_request(req);
1193 flags = le32_to_cpu(rhead->flags);
1194
1195 /*
1196 * if this connection filled our message, drop our reference now, to
1197 * avoid a (safe but slower) revoke later.
1198 */
1199 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1200 dout(" dropping con_filling_msg ref %p\n", con);
1201 req->r_con_filling_msg = NULL;
1202 ceph_con_put(con);
1203 }
1204
1205 if (!req->r_got_reply) {
1206 unsigned bytes;
1207
1208 req->r_result = le32_to_cpu(rhead->result);
1209 bytes = le32_to_cpu(msg->hdr.data_len);
1210 dout("handle_reply result %d bytes %d\n", req->r_result,
1211 bytes);
1212 if (req->r_result == 0)
1213 req->r_result = bytes;
1214
1215 /* in case this is a write and we need to replay, */
1216 req->r_reassert_version = rhead->reassert_version;
1217
1218 req->r_got_reply = 1;
1219 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1220 dout("handle_reply tid %llu dup ack\n", tid);
1221 mutex_unlock(&osdc->request_mutex);
1222 goto done;
1223 }
1224
1225 dout("handle_reply tid %llu flags %d\n", tid, flags);
1226
1227 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1228 __register_linger_request(osdc, req);
1229
1230 /* either this is a read, or we got the safe response */
1231 if (result < 0 ||
1232 (flags & CEPH_OSD_FLAG_ONDISK) ||
1233 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1234 __unregister_request(osdc, req);
1235
1236 mutex_unlock(&osdc->request_mutex);
1237
1238 if (req->r_callback)
1239 req->r_callback(req, msg);
1240 else
1241 complete_all(&req->r_completion);
1242
1243 if (flags & CEPH_OSD_FLAG_ONDISK)
1244 complete_request(req);
1245
1246 done:
1247 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1248 ceph_osdc_put_request(req);
1249 return;
1250
1251 bad:
1252 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1253 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1254 (int)sizeof(*rhead));
1255 ceph_msg_dump(msg);
1256 }
1257
1258 static void reset_changed_osds(struct ceph_osd_client *osdc)
1259 {
1260 struct rb_node *p, *n;
1261
1262 for (p = rb_first(&osdc->osds); p; p = n) {
1263 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1264
1265 n = rb_next(p);
1266 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1267 memcmp(&osd->o_con.peer_addr,
1268 ceph_osd_addr(osdc->osdmap,
1269 osd->o_osd),
1270 sizeof(struct ceph_entity_addr)) != 0)
1271 __reset_osd(osdc, osd);
1272 }
1273 }
1274
1275 /*
1276 * Requeue requests whose mapping to an OSD has changed. If requests map to
1277 * no osd, request a new map.
1278 *
1279 * Caller should hold map_sem for read and request_mutex.
1280 */
1281 static void kick_requests(struct ceph_osd_client *osdc)
1282 {
1283 struct ceph_osd_request *req, *nreq;
1284 struct rb_node *p;
1285 int needmap = 0;
1286 int err;
1287
1288 dout("kick_requests\n");
1289 mutex_lock(&osdc->request_mutex);
1290 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1291 req = rb_entry(p, struct ceph_osd_request, r_node);
1292 err = __map_request(osdc, req);
1293 if (err < 0)
1294 continue; /* error */
1295 if (req->r_osd == NULL) {
1296 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1297 needmap++; /* request a newer map */
1298 } else if (err > 0) {
1299 dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1300 req->r_osd ? req->r_osd->o_osd : -1);
1301 if (!req->r_linger)
1302 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1303 }
1304 }
1305
1306 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1307 r_linger_item) {
1308 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1309
1310 err = __map_request(osdc, req);
1311 if (err == 0)
1312 continue; /* no change and no osd was specified */
1313 if (err < 0)
1314 continue; /* hrm! */
1315 if (req->r_osd == NULL) {
1316 dout("tid %llu maps to no valid osd\n", req->r_tid);
1317 needmap++; /* request a newer map */
1318 continue;
1319 }
1320
1321 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1322 req->r_osd ? req->r_osd->o_osd : -1);
1323 __unregister_linger_request(osdc, req);
1324 __register_request(osdc, req);
1325 }
1326 mutex_unlock(&osdc->request_mutex);
1327
1328 if (needmap) {
1329 dout("%d requests for down osds, need new map\n", needmap);
1330 ceph_monc_request_next_osdmap(&osdc->client->monc);
1331 }
1332 }
1333
1334
1335 /*
1336 * Process updated osd map.
1337 *
1338 * The message contains any number of incremental and full maps, normally
1339 * indicating some sort of topology change in the cluster. Kick requests
1340 * off to different OSDs as needed.
1341 */
1342 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1343 {
1344 void *p, *end, *next;
1345 u32 nr_maps, maplen;
1346 u32 epoch;
1347 struct ceph_osdmap *newmap = NULL, *oldmap;
1348 int err;
1349 struct ceph_fsid fsid;
1350
1351 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1352 p = msg->front.iov_base;
1353 end = p + msg->front.iov_len;
1354
1355 /* verify fsid */
1356 ceph_decode_need(&p, end, sizeof(fsid), bad);
1357 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1358 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1359 return;
1360
1361 down_write(&osdc->map_sem);
1362
1363 /* incremental maps */
1364 ceph_decode_32_safe(&p, end, nr_maps, bad);
1365 dout(" %d inc maps\n", nr_maps);
1366 while (nr_maps > 0) {
1367 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1368 epoch = ceph_decode_32(&p);
1369 maplen = ceph_decode_32(&p);
1370 ceph_decode_need(&p, end, maplen, bad);
1371 next = p + maplen;
1372 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1373 dout("applying incremental map %u len %d\n",
1374 epoch, maplen);
1375 newmap = osdmap_apply_incremental(&p, next,
1376 osdc->osdmap,
1377 osdc->client->msgr);
1378 if (IS_ERR(newmap)) {
1379 err = PTR_ERR(newmap);
1380 goto bad;
1381 }
1382 BUG_ON(!newmap);
1383 if (newmap != osdc->osdmap) {
1384 ceph_osdmap_destroy(osdc->osdmap);
1385 osdc->osdmap = newmap;
1386 }
1387 kick_requests(osdc);
1388 reset_changed_osds(osdc);
1389 } else {
1390 dout("ignoring incremental map %u len %d\n",
1391 epoch, maplen);
1392 }
1393 p = next;
1394 nr_maps--;
1395 }
1396 if (newmap)
1397 goto done;
1398
1399 /* full maps */
1400 ceph_decode_32_safe(&p, end, nr_maps, bad);
1401 dout(" %d full maps\n", nr_maps);
1402 while (nr_maps) {
1403 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1404 epoch = ceph_decode_32(&p);
1405 maplen = ceph_decode_32(&p);
1406 ceph_decode_need(&p, end, maplen, bad);
1407 if (nr_maps > 1) {
1408 dout("skipping non-latest full map %u len %d\n",
1409 epoch, maplen);
1410 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1411 dout("skipping full map %u len %d, "
1412 "older than our %u\n", epoch, maplen,
1413 osdc->osdmap->epoch);
1414 } else {
1415 dout("taking full map %u len %d\n", epoch, maplen);
1416 newmap = osdmap_decode(&p, p+maplen);
1417 if (IS_ERR(newmap)) {
1418 err = PTR_ERR(newmap);
1419 goto bad;
1420 }
1421 BUG_ON(!newmap);
1422 oldmap = osdc->osdmap;
1423 osdc->osdmap = newmap;
1424 if (oldmap)
1425 ceph_osdmap_destroy(oldmap);
1426 kick_requests(osdc);
1427 }
1428 p += maplen;
1429 nr_maps--;
1430 }
1431
1432 done:
1433 downgrade_write(&osdc->map_sem);
1434 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1435
1436 /*
1437 * subscribe to subsequent osdmap updates if full to ensure
1438 * we find out when we are no longer full and stop returning
1439 * ENOSPC.
1440 */
1441 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1442 ceph_monc_request_next_osdmap(&osdc->client->monc);
1443
1444 send_queued(osdc);
1445 up_read(&osdc->map_sem);
1446 wake_up_all(&osdc->client->auth_wq);
1447 return;
1448
1449 bad:
1450 pr_err("osdc handle_map corrupt msg\n");
1451 ceph_msg_dump(msg);
1452 up_write(&osdc->map_sem);
1453 return;
1454 }
1455
1456 /*
1457 * watch/notify callback event infrastructure
1458 *
1459 * These callbacks are used both for watch and notify operations.
1460 */
1461 static void __release_event(struct kref *kref)
1462 {
1463 struct ceph_osd_event *event =
1464 container_of(kref, struct ceph_osd_event, kref);
1465
1466 dout("__release_event %p\n", event);
1467 kfree(event);
1468 }
1469
1470 static void get_event(struct ceph_osd_event *event)
1471 {
1472 kref_get(&event->kref);
1473 }
1474
1475 void ceph_osdc_put_event(struct ceph_osd_event *event)
1476 {
1477 kref_put(&event->kref, __release_event);
1478 }
1479 EXPORT_SYMBOL(ceph_osdc_put_event);
1480
1481 static void __insert_event(struct ceph_osd_client *osdc,
1482 struct ceph_osd_event *new)
1483 {
1484 struct rb_node **p = &osdc->event_tree.rb_node;
1485 struct rb_node *parent = NULL;
1486 struct ceph_osd_event *event = NULL;
1487
1488 while (*p) {
1489 parent = *p;
1490 event = rb_entry(parent, struct ceph_osd_event, node);
1491 if (new->cookie < event->cookie)
1492 p = &(*p)->rb_left;
1493 else if (new->cookie > event->cookie)
1494 p = &(*p)->rb_right;
1495 else
1496 BUG();
1497 }
1498
1499 rb_link_node(&new->node, parent, p);
1500 rb_insert_color(&new->node, &osdc->event_tree);
1501 }
1502
1503 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1504 u64 cookie)
1505 {
1506 struct rb_node **p = &osdc->event_tree.rb_node;
1507 struct rb_node *parent = NULL;
1508 struct ceph_osd_event *event = NULL;
1509
1510 while (*p) {
1511 parent = *p;
1512 event = rb_entry(parent, struct ceph_osd_event, node);
1513 if (cookie < event->cookie)
1514 p = &(*p)->rb_left;
1515 else if (cookie > event->cookie)
1516 p = &(*p)->rb_right;
1517 else
1518 return event;
1519 }
1520 return NULL;
1521 }
1522
1523 static void __remove_event(struct ceph_osd_event *event)
1524 {
1525 struct ceph_osd_client *osdc = event->osdc;
1526
1527 if (!RB_EMPTY_NODE(&event->node)) {
1528 dout("__remove_event removed %p\n", event);
1529 rb_erase(&event->node, &osdc->event_tree);
1530 ceph_osdc_put_event(event);
1531 } else {
1532 dout("__remove_event didn't remove %p\n", event);
1533 }
1534 }
1535
1536 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1537 void (*event_cb)(u64, u64, u8, void *),
1538 int one_shot, void *data,
1539 struct ceph_osd_event **pevent)
1540 {
1541 struct ceph_osd_event *event;
1542
1543 event = kmalloc(sizeof(*event), GFP_NOIO);
1544 if (!event)
1545 return -ENOMEM;
1546
1547 dout("create_event %p\n", event);
1548 event->cb = event_cb;
1549 event->one_shot = one_shot;
1550 event->data = data;
1551 event->osdc = osdc;
1552 INIT_LIST_HEAD(&event->osd_node);
1553 kref_init(&event->kref); /* one ref for us */
1554 kref_get(&event->kref); /* one ref for the caller */
1555 init_completion(&event->completion);
1556
1557 spin_lock(&osdc->event_lock);
1558 event->cookie = ++osdc->event_count;
1559 __insert_event(osdc, event);
1560 spin_unlock(&osdc->event_lock);
1561
1562 *pevent = event;
1563 return 0;
1564 }
1565 EXPORT_SYMBOL(ceph_osdc_create_event);
1566
1567 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1568 {
1569 struct ceph_osd_client *osdc = event->osdc;
1570
1571 dout("cancel_event %p\n", event);
1572 spin_lock(&osdc->event_lock);
1573 __remove_event(event);
1574 spin_unlock(&osdc->event_lock);
1575 ceph_osdc_put_event(event); /* caller's */
1576 }
1577 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1578
1579
1580 static void do_event_work(struct work_struct *work)
1581 {
1582 struct ceph_osd_event_work *event_work =
1583 container_of(work, struct ceph_osd_event_work, work);
1584 struct ceph_osd_event *event = event_work->event;
1585 u64 ver = event_work->ver;
1586 u64 notify_id = event_work->notify_id;
1587 u8 opcode = event_work->opcode;
1588
1589 dout("do_event_work completing %p\n", event);
1590 event->cb(ver, notify_id, opcode, event->data);
1591 complete(&event->completion);
1592 dout("do_event_work completed %p\n", event);
1593 ceph_osdc_put_event(event);
1594 kfree(event_work);
1595 }
1596
1597
1598 /*
1599 * Process osd watch notifications
1600 */
1601 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1602 {
1603 void *p, *end;
1604 u8 proto_ver;
1605 u64 cookie, ver, notify_id;
1606 u8 opcode;
1607 struct ceph_osd_event *event;
1608 struct ceph_osd_event_work *event_work;
1609
1610 p = msg->front.iov_base;
1611 end = p + msg->front.iov_len;
1612
1613 ceph_decode_8_safe(&p, end, proto_ver, bad);
1614 ceph_decode_8_safe(&p, end, opcode, bad);
1615 ceph_decode_64_safe(&p, end, cookie, bad);
1616 ceph_decode_64_safe(&p, end, ver, bad);
1617 ceph_decode_64_safe(&p, end, notify_id, bad);
1618
1619 spin_lock(&osdc->event_lock);
1620 event = __find_event(osdc, cookie);
1621 if (event) {
1622 get_event(event);
1623 if (event->one_shot)
1624 __remove_event(event);
1625 }
1626 spin_unlock(&osdc->event_lock);
1627 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1628 cookie, ver, event);
1629 if (event) {
1630 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1631 if (!event_work) {
1632 dout("ERROR: could not allocate event_work\n");
1633 goto done_err;
1634 }
1635 INIT_WORK(&event_work->work, do_event_work);
1636 event_work->event = event;
1637 event_work->ver = ver;
1638 event_work->notify_id = notify_id;
1639 event_work->opcode = opcode;
1640 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1641 dout("WARNING: failed to queue notify event work\n");
1642 goto done_err;
1643 }
1644 }
1645
1646 return;
1647
1648 done_err:
1649 complete(&event->completion);
1650 ceph_osdc_put_event(event);
1651 return;
1652
1653 bad:
1654 pr_err("osdc handle_watch_notify corrupt msg\n");
1655 return;
1656 }
1657
1658 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1659 {
1660 int err;
1661
1662 dout("wait_event %p\n", event);
1663 err = wait_for_completion_interruptible_timeout(&event->completion,
1664 timeout * HZ);
1665 ceph_osdc_put_event(event);
1666 if (err > 0)
1667 err = 0;
1668 dout("wait_event %p returns %d\n", event, err);
1669 return err;
1670 }
1671 EXPORT_SYMBOL(ceph_osdc_wait_event);
1672
1673 /*
1674 * Register request, send initial attempt.
1675 */
1676 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1677 struct ceph_osd_request *req,
1678 bool nofail)
1679 {
1680 int rc = 0;
1681
1682 req->r_request->pages = req->r_pages;
1683 req->r_request->nr_pages = req->r_num_pages;
1684 #ifdef CONFIG_BLOCK
1685 req->r_request->bio = req->r_bio;
1686 #endif
1687 req->r_request->trail = req->r_trail;
1688
1689 register_request(osdc, req);
1690
1691 down_read(&osdc->map_sem);
1692 mutex_lock(&osdc->request_mutex);
1693 /*
1694 * a racing kick_requests() may have sent the message for us
1695 * while we dropped request_mutex above, so only send now if
1696 * the request still han't been touched yet.
1697 */
1698 if (req->r_sent == 0) {
1699 rc = __map_request(osdc, req);
1700 if (rc < 0) {
1701 if (nofail) {
1702 dout("osdc_start_request failed map, "
1703 " will retry %lld\n", req->r_tid);
1704 rc = 0;
1705 }
1706 goto out_unlock;
1707 }
1708 if (req->r_osd == NULL) {
1709 dout("send_request %p no up osds in pg\n", req);
1710 ceph_monc_request_next_osdmap(&osdc->client->monc);
1711 } else {
1712 rc = __send_request(osdc, req);
1713 if (rc) {
1714 if (nofail) {
1715 dout("osdc_start_request failed send, "
1716 " will retry %lld\n", req->r_tid);
1717 rc = 0;
1718 } else {
1719 __unregister_request(osdc, req);
1720 }
1721 }
1722 }
1723 }
1724
1725 out_unlock:
1726 mutex_unlock(&osdc->request_mutex);
1727 up_read(&osdc->map_sem);
1728 return rc;
1729 }
1730 EXPORT_SYMBOL(ceph_osdc_start_request);
1731
1732 /*
1733 * wait for a request to complete
1734 */
1735 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1736 struct ceph_osd_request *req)
1737 {
1738 int rc;
1739
1740 rc = wait_for_completion_interruptible(&req->r_completion);
1741 if (rc < 0) {
1742 mutex_lock(&osdc->request_mutex);
1743 __cancel_request(req);
1744 __unregister_request(osdc, req);
1745 mutex_unlock(&osdc->request_mutex);
1746 complete_request(req);
1747 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1748 return rc;
1749 }
1750
1751 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1752 return req->r_result;
1753 }
1754 EXPORT_SYMBOL(ceph_osdc_wait_request);
1755
1756 /*
1757 * sync - wait for all in-flight requests to flush. avoid starvation.
1758 */
1759 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1760 {
1761 struct ceph_osd_request *req;
1762 u64 last_tid, next_tid = 0;
1763
1764 mutex_lock(&osdc->request_mutex);
1765 last_tid = osdc->last_tid;
1766 while (1) {
1767 req = __lookup_request_ge(osdc, next_tid);
1768 if (!req)
1769 break;
1770 if (req->r_tid > last_tid)
1771 break;
1772
1773 next_tid = req->r_tid + 1;
1774 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1775 continue;
1776
1777 ceph_osdc_get_request(req);
1778 mutex_unlock(&osdc->request_mutex);
1779 dout("sync waiting on tid %llu (last is %llu)\n",
1780 req->r_tid, last_tid);
1781 wait_for_completion(&req->r_safe_completion);
1782 mutex_lock(&osdc->request_mutex);
1783 ceph_osdc_put_request(req);
1784 }
1785 mutex_unlock(&osdc->request_mutex);
1786 dout("sync done (thru tid %llu)\n", last_tid);
1787 }
1788 EXPORT_SYMBOL(ceph_osdc_sync);
1789
1790 /*
1791 * init, shutdown
1792 */
1793 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1794 {
1795 int err;
1796
1797 dout("init\n");
1798 osdc->client = client;
1799 osdc->osdmap = NULL;
1800 init_rwsem(&osdc->map_sem);
1801 init_completion(&osdc->map_waiters);
1802 osdc->last_requested_map = 0;
1803 mutex_init(&osdc->request_mutex);
1804 osdc->last_tid = 0;
1805 osdc->osds = RB_ROOT;
1806 INIT_LIST_HEAD(&osdc->osd_lru);
1807 osdc->requests = RB_ROOT;
1808 INIT_LIST_HEAD(&osdc->req_lru);
1809 INIT_LIST_HEAD(&osdc->req_unsent);
1810 INIT_LIST_HEAD(&osdc->req_notarget);
1811 INIT_LIST_HEAD(&osdc->req_linger);
1812 osdc->num_requests = 0;
1813 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1814 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1815 spin_lock_init(&osdc->event_lock);
1816 osdc->event_tree = RB_ROOT;
1817 osdc->event_count = 0;
1818
1819 schedule_delayed_work(&osdc->osds_timeout_work,
1820 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1821
1822 err = -ENOMEM;
1823 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1824 sizeof(struct ceph_osd_request));
1825 if (!osdc->req_mempool)
1826 goto out;
1827
1828 err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1829 "osd_op");
1830 if (err < 0)
1831 goto out_mempool;
1832 err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1833 OSD_OPREPLY_FRONT_LEN, 10, true,
1834 "osd_op_reply");
1835 if (err < 0)
1836 goto out_msgpool;
1837
1838 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1839 if (IS_ERR(osdc->notify_wq)) {
1840 err = PTR_ERR(osdc->notify_wq);
1841 osdc->notify_wq = NULL;
1842 goto out_msgpool;
1843 }
1844 return 0;
1845
1846 out_msgpool:
1847 ceph_msgpool_destroy(&osdc->msgpool_op);
1848 out_mempool:
1849 mempool_destroy(osdc->req_mempool);
1850 out:
1851 return err;
1852 }
1853 EXPORT_SYMBOL(ceph_osdc_init);
1854
1855 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1856 {
1857 flush_workqueue(osdc->notify_wq);
1858 destroy_workqueue(osdc->notify_wq);
1859 cancel_delayed_work_sync(&osdc->timeout_work);
1860 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1861 if (osdc->osdmap) {
1862 ceph_osdmap_destroy(osdc->osdmap);
1863 osdc->osdmap = NULL;
1864 }
1865 remove_old_osds(osdc, 1);
1866 WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
1867 mempool_destroy(osdc->req_mempool);
1868 ceph_msgpool_destroy(&osdc->msgpool_op);
1869 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1870 }
1871 EXPORT_SYMBOL(ceph_osdc_stop);
1872
1873 /*
1874 * Read some contiguous pages. If we cross a stripe boundary, shorten
1875 * *plen. Return number of bytes read, or error.
1876 */
1877 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1878 struct ceph_vino vino, struct ceph_file_layout *layout,
1879 u64 off, u64 *plen,
1880 u32 truncate_seq, u64 truncate_size,
1881 struct page **pages, int num_pages, int page_align)
1882 {
1883 struct ceph_osd_request *req;
1884 int rc = 0;
1885
1886 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1887 vino.snap, off, *plen);
1888 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1889 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1890 NULL, 0, truncate_seq, truncate_size, NULL,
1891 false, 1, page_align);
1892 if (!req)
1893 return -ENOMEM;
1894
1895 /* it may be a short read due to an object boundary */
1896 req->r_pages = pages;
1897
1898 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1899 off, *plen, req->r_num_pages, page_align);
1900
1901 rc = ceph_osdc_start_request(osdc, req, false);
1902 if (!rc)
1903 rc = ceph_osdc_wait_request(osdc, req);
1904
1905 ceph_osdc_put_request(req);
1906 dout("readpages result %d\n", rc);
1907 return rc;
1908 }
1909 EXPORT_SYMBOL(ceph_osdc_readpages);
1910
1911 /*
1912 * do a synchronous write on N pages
1913 */
1914 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1915 struct ceph_file_layout *layout,
1916 struct ceph_snap_context *snapc,
1917 u64 off, u64 len,
1918 u32 truncate_seq, u64 truncate_size,
1919 struct timespec *mtime,
1920 struct page **pages, int num_pages,
1921 int flags, int do_sync, bool nofail)
1922 {
1923 struct ceph_osd_request *req;
1924 int rc = 0;
1925 int page_align = off & ~PAGE_MASK;
1926
1927 BUG_ON(vino.snap != CEPH_NOSNAP);
1928 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1929 CEPH_OSD_OP_WRITE,
1930 flags | CEPH_OSD_FLAG_ONDISK |
1931 CEPH_OSD_FLAG_WRITE,
1932 snapc, do_sync,
1933 truncate_seq, truncate_size, mtime,
1934 nofail, 1, page_align);
1935 if (!req)
1936 return -ENOMEM;
1937
1938 /* it may be a short write due to an object boundary */
1939 req->r_pages = pages;
1940 dout("writepages %llu~%llu (%d pages)\n", off, len,
1941 req->r_num_pages);
1942
1943 rc = ceph_osdc_start_request(osdc, req, nofail);
1944 if (!rc)
1945 rc = ceph_osdc_wait_request(osdc, req);
1946
1947 ceph_osdc_put_request(req);
1948 if (rc == 0)
1949 rc = len;
1950 dout("writepages result %d\n", rc);
1951 return rc;
1952 }
1953 EXPORT_SYMBOL(ceph_osdc_writepages);
1954
1955 /*
1956 * handle incoming message
1957 */
1958 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1959 {
1960 struct ceph_osd *osd = con->private;
1961 struct ceph_osd_client *osdc;
1962 int type = le16_to_cpu(msg->hdr.type);
1963
1964 if (!osd)
1965 goto out;
1966 osdc = osd->o_osdc;
1967
1968 switch (type) {
1969 case CEPH_MSG_OSD_MAP:
1970 ceph_osdc_handle_map(osdc, msg);
1971 break;
1972 case CEPH_MSG_OSD_OPREPLY:
1973 handle_reply(osdc, msg, con);
1974 break;
1975 case CEPH_MSG_WATCH_NOTIFY:
1976 handle_watch_notify(osdc, msg);
1977 break;
1978
1979 default:
1980 pr_err("received unknown message type %d %s\n", type,
1981 ceph_msg_type_name(type));
1982 }
1983 out:
1984 ceph_msg_put(msg);
1985 }
1986
1987 /*
1988 * lookup and return message for incoming reply. set up reply message
1989 * pages.
1990 */
1991 static struct ceph_msg *get_reply(struct ceph_connection *con,
1992 struct ceph_msg_header *hdr,
1993 int *skip)
1994 {
1995 struct ceph_osd *osd = con->private;
1996 struct ceph_osd_client *osdc = osd->o_osdc;
1997 struct ceph_msg *m;
1998 struct ceph_osd_request *req;
1999 int front = le32_to_cpu(hdr->front_len);
2000 int data_len = le32_to_cpu(hdr->data_len);
2001 u64 tid;
2002
2003 tid = le64_to_cpu(hdr->tid);
2004 mutex_lock(&osdc->request_mutex);
2005 req = __lookup_request(osdc, tid);
2006 if (!req) {
2007 *skip = 1;
2008 m = NULL;
2009 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2010 osd->o_osd);
2011 goto out;
2012 }
2013
2014 if (req->r_con_filling_msg) {
2015 dout("get_reply revoking msg %p from old con %p\n",
2016 req->r_reply, req->r_con_filling_msg);
2017 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2018 ceph_con_put(req->r_con_filling_msg);
2019 req->r_con_filling_msg = NULL;
2020 }
2021
2022 if (front > req->r_reply->front.iov_len) {
2023 pr_warning("get_reply front %d > preallocated %d\n",
2024 front, (int)req->r_reply->front.iov_len);
2025 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2026 if (!m)
2027 goto out;
2028 ceph_msg_put(req->r_reply);
2029 req->r_reply = m;
2030 }
2031 m = ceph_msg_get(req->r_reply);
2032
2033 if (data_len > 0) {
2034 int want = calc_pages_for(req->r_page_alignment, data_len);
2035
2036 if (unlikely(req->r_num_pages < want)) {
2037 pr_warning("tid %lld reply has %d bytes %d pages, we"
2038 " had only %d pages ready\n", tid, data_len,
2039 want, req->r_num_pages);
2040 *skip = 1;
2041 ceph_msg_put(m);
2042 m = NULL;
2043 goto out;
2044 }
2045 m->pages = req->r_pages;
2046 m->nr_pages = req->r_num_pages;
2047 m->page_alignment = req->r_page_alignment;
2048 #ifdef CONFIG_BLOCK
2049 m->bio = req->r_bio;
2050 #endif
2051 }
2052 *skip = 0;
2053 req->r_con_filling_msg = ceph_con_get(con);
2054 dout("get_reply tid %lld %p\n", tid, m);
2055
2056 out:
2057 mutex_unlock(&osdc->request_mutex);
2058 return m;
2059
2060 }
2061
2062 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2063 struct ceph_msg_header *hdr,
2064 int *skip)
2065 {
2066 struct ceph_osd *osd = con->private;
2067 int type = le16_to_cpu(hdr->type);
2068 int front = le32_to_cpu(hdr->front_len);
2069
2070 switch (type) {
2071 case CEPH_MSG_OSD_MAP:
2072 case CEPH_MSG_WATCH_NOTIFY:
2073 return ceph_msg_new(type, front, GFP_NOFS, false);
2074 case CEPH_MSG_OSD_OPREPLY:
2075 return get_reply(con, hdr, skip);
2076 default:
2077 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2078 osd->o_osd);
2079 *skip = 1;
2080 return NULL;
2081 }
2082 }
2083
2084 /*
2085 * Wrappers to refcount containing ceph_osd struct
2086 */
2087 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2088 {
2089 struct ceph_osd *osd = con->private;
2090 if (get_osd(osd))
2091 return con;
2092 return NULL;
2093 }
2094
2095 static void put_osd_con(struct ceph_connection *con)
2096 {
2097 struct ceph_osd *osd = con->private;
2098 put_osd(osd);
2099 }
2100
2101 /*
2102 * authentication
2103 */
2104 static int get_authorizer(struct ceph_connection *con,
2105 void **buf, int *len, int *proto,
2106 void **reply_buf, int *reply_len, int force_new)
2107 {
2108 struct ceph_osd *o = con->private;
2109 struct ceph_osd_client *osdc = o->o_osdc;
2110 struct ceph_auth_client *ac = osdc->client->monc.auth;
2111 int ret = 0;
2112
2113 if (force_new && o->o_authorizer) {
2114 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2115 o->o_authorizer = NULL;
2116 }
2117 if (o->o_authorizer == NULL) {
2118 ret = ac->ops->create_authorizer(
2119 ac, CEPH_ENTITY_TYPE_OSD,
2120 &o->o_authorizer,
2121 &o->o_authorizer_buf,
2122 &o->o_authorizer_buf_len,
2123 &o->o_authorizer_reply_buf,
2124 &o->o_authorizer_reply_buf_len);
2125 if (ret)
2126 return ret;
2127 }
2128
2129 *proto = ac->protocol;
2130 *buf = o->o_authorizer_buf;
2131 *len = o->o_authorizer_buf_len;
2132 *reply_buf = o->o_authorizer_reply_buf;
2133 *reply_len = o->o_authorizer_reply_buf_len;
2134 return 0;
2135 }
2136
2137
2138 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2139 {
2140 struct ceph_osd *o = con->private;
2141 struct ceph_osd_client *osdc = o->o_osdc;
2142 struct ceph_auth_client *ac = osdc->client->monc.auth;
2143
2144 return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2145 }
2146
2147 static int invalidate_authorizer(struct ceph_connection *con)
2148 {
2149 struct ceph_osd *o = con->private;
2150 struct ceph_osd_client *osdc = o->o_osdc;
2151 struct ceph_auth_client *ac = osdc->client->monc.auth;
2152
2153 if (ac->ops->invalidate_authorizer)
2154 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2155
2156 return ceph_monc_validate_auth(&osdc->client->monc);
2157 }
2158
2159 static const struct ceph_connection_operations osd_con_ops = {
2160 .get = get_osd_con,
2161 .put = put_osd_con,
2162 .dispatch = dispatch,
2163 .get_authorizer = get_authorizer,
2164 .verify_authorizer_reply = verify_authorizer_reply,
2165 .invalidate_authorizer = invalidate_authorizer,
2166 .alloc_msg = alloc_msg,
2167 .fault = osd_reset,
2168 };
linux-next