?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: cdc-acm: use dev_vdbg in read/write paths
[linux-2.6/kvm.git] / net / ceph / osd_client.c
blob50af02737a3d216e0b66c23003172163fbd71bbd
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/err.h>
5 #include <linux/highmem.h>
6 #include <linux/mm.h>
7 #include <linux/pagemap.h>
8 #include <linux/slab.h>
9 #include <linux/uaccess.h>
10 #ifdef CONFIG_BLOCK
11 #include <linux/bio.h>
12 #endif
13
14 #include <linux/ceph/libceph.h>
15 #include <linux/ceph/osd_client.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/decode.h>
18 #include <linux/ceph/auth.h>
19 #include <linux/ceph/pagelist.h>
20
21 #define OSD_OP_FRONT_LEN 4096
22 #define OSD_OPREPLY_FRONT_LEN 512
23
24 static const struct ceph_connection_operations osd_con_ops;
25
26 static void send_queued(struct ceph_osd_client *osdc);
27 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
28 static void __register_request(struct ceph_osd_client *osdc,
29 struct ceph_osd_request *req);
30 static void __unregister_linger_request(struct ceph_osd_client *osdc,
31 struct ceph_osd_request *req);
32 static int __send_request(struct ceph_osd_client *osdc,
33 struct ceph_osd_request *req);
34
35 static int op_needs_trail(int op)
36 {
37 switch (op) {
38 case CEPH_OSD_OP_GETXATTR:
39 case CEPH_OSD_OP_SETXATTR:
40 case CEPH_OSD_OP_CMPXATTR:
41 case CEPH_OSD_OP_CALL:
42 case CEPH_OSD_OP_NOTIFY:
43 return 1;
44 default:
45 return 0;
46 }
47 }
48
49 static int op_has_extent(int op)
50 {
51 return (op == CEPH_OSD_OP_READ ||
52 op == CEPH_OSD_OP_WRITE);
53 }
54
55 void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
56 struct ceph_file_layout *layout,
57 u64 snapid,
58 u64 off, u64 *plen, u64 *bno,
59 struct ceph_osd_request *req,
60 struct ceph_osd_req_op *op)
61 {
62 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
63 u64 orig_len = *plen;
64 u64 objoff, objlen; /* extent in object */
65
66 reqhead->snapid = cpu_to_le64(snapid);
67
68 /* object extent? */
69 ceph_calc_file_object_mapping(layout, off, plen, bno,
70 &objoff, &objlen);
71 if (*plen < orig_len)
72 dout(" skipping last %llu, final file extent %llu~%llu\n",
73 orig_len - *plen, off, *plen);
74
75 if (op_has_extent(op->op)) {
76 op->extent.offset = objoff;
77 op->extent.length = objlen;
78 }
79 req->r_num_pages = calc_pages_for(off, *plen);
80 req->r_page_alignment = off & ~PAGE_MASK;
81 if (op->op == CEPH_OSD_OP_WRITE)
82 op->payload_len = *plen;
83
84 dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
85 *bno, objoff, objlen, req->r_num_pages);
86
87 }
88 EXPORT_SYMBOL(ceph_calc_raw_layout);
89
90 /*
91 * Implement client access to distributed object storage cluster.
92 *
93 * All data objects are stored within a cluster/cloud of OSDs, or
94 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
95 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
96 * remote daemons serving up and coordinating consistent and safe
97 * access to storage.
98 *
99 * Cluster membership and the mapping of data objects onto storage devices
100 * are described by the osd map.
101 *
102 * We keep track of pending OSD requests (read, write), resubmit
103 * requests to different OSDs when the cluster topology/data layout
104 * change, or retry the affected requests when the communications
105 * channel with an OSD is reset.
106 */
107
108 /*
109 * calculate the mapping of a file extent onto an object, and fill out the
110 * request accordingly. shorten extent as necessary if it crosses an
111 * object boundary.
112 *
113 * fill osd op in request message.
114 */
115 static void calc_layout(struct ceph_osd_client *osdc,
116 struct ceph_vino vino,
117 struct ceph_file_layout *layout,
118 u64 off, u64 *plen,
119 struct ceph_osd_request *req,
120 struct ceph_osd_req_op *op)
121 {
122 u64 bno;
123
124 ceph_calc_raw_layout(osdc, layout, vino.snap, off,
125 plen, &bno, req, op);
126
127 sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
128 req->r_oid_len = strlen(req->r_oid);
129 }
130
131 /*
132 * requests
133 */
134 void ceph_osdc_release_request(struct kref *kref)
135 {
136 struct ceph_osd_request *req = container_of(kref,
137 struct ceph_osd_request,
138 r_kref);
139
140 if (req->r_request)
141 ceph_msg_put(req->r_request);
142 if (req->r_reply)
143 ceph_msg_put(req->r_reply);
144 if (req->r_con_filling_msg) {
145 dout("release_request revoking pages %p from con %p\n",
146 req->r_pages, req->r_con_filling_msg);
147 ceph_con_revoke_message(req->r_con_filling_msg,
148 req->r_reply);
149 ceph_con_put(req->r_con_filling_msg);
150 }
151 if (req->r_own_pages)
152 ceph_release_page_vector(req->r_pages,
153 req->r_num_pages);
154 #ifdef CONFIG_BLOCK
155 if (req->r_bio)
156 bio_put(req->r_bio);
157 #endif
158 ceph_put_snap_context(req->r_snapc);
159 if (req->r_trail) {
160 ceph_pagelist_release(req->r_trail);
161 kfree(req->r_trail);
162 }
163 if (req->r_mempool)
164 mempool_free(req, req->r_osdc->req_mempool);
165 else
166 kfree(req);
167 }
168 EXPORT_SYMBOL(ceph_osdc_release_request);
169
170 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
171 {
172 int i = 0;
173
174 if (needs_trail)
175 *needs_trail = 0;
176 while (ops[i].op) {
177 if (needs_trail && op_needs_trail(ops[i].op))
178 *needs_trail = 1;
179 i++;
180 }
181
182 return i;
183 }
184
185 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
186 int flags,
187 struct ceph_snap_context *snapc,
188 struct ceph_osd_req_op *ops,
189 bool use_mempool,
190 gfp_t gfp_flags,
191 struct page **pages,
192 struct bio *bio)
193 {
194 struct ceph_osd_request *req;
195 struct ceph_msg *msg;
196 int needs_trail;
197 int num_op = get_num_ops(ops, &needs_trail);
198 size_t msg_size = sizeof(struct ceph_osd_request_head);
199
200 msg_size += num_op*sizeof(struct ceph_osd_op);
201
202 if (use_mempool) {
203 req = mempool_alloc(osdc->req_mempool, gfp_flags);
204 memset(req, 0, sizeof(*req));
205 } else {
206 req = kzalloc(sizeof(*req), gfp_flags);
207 }
208 if (req == NULL)
209 return NULL;
210
211 req->r_osdc = osdc;
212 req->r_mempool = use_mempool;
213
214 kref_init(&req->r_kref);
215 init_completion(&req->r_completion);
216 init_completion(&req->r_safe_completion);
217 INIT_LIST_HEAD(&req->r_unsafe_item);
218 INIT_LIST_HEAD(&req->r_linger_item);
219 INIT_LIST_HEAD(&req->r_linger_osd);
220 req->r_flags = flags;
221
222 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
223
224 /* create reply message */
225 if (use_mempool)
226 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
227 else
228 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
229 OSD_OPREPLY_FRONT_LEN, gfp_flags);
230 if (!msg) {
231 ceph_osdc_put_request(req);
232 return NULL;
233 }
234 req->r_reply = msg;
235
236 /* allocate space for the trailing data */
237 if (needs_trail) {
238 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
239 if (!req->r_trail) {
240 ceph_osdc_put_request(req);
241 return NULL;
242 }
243 ceph_pagelist_init(req->r_trail);
244 }
245 /* create request message; allow space for oid */
246 msg_size += 40;
247 if (snapc)
248 msg_size += sizeof(u64) * snapc->num_snaps;
249 if (use_mempool)
250 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
251 else
252 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
253 if (!msg) {
254 ceph_osdc_put_request(req);
255 return NULL;
256 }
257
258 msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
259 memset(msg->front.iov_base, 0, msg->front.iov_len);
260
261 req->r_request = msg;
262 req->r_pages = pages;
263 #ifdef CONFIG_BLOCK
264 if (bio) {
265 req->r_bio = bio;
266 bio_get(req->r_bio);
267 }
268 #endif
269
270 return req;
271 }
272 EXPORT_SYMBOL(ceph_osdc_alloc_request);
273
274 static void osd_req_encode_op(struct ceph_osd_request *req,
275 struct ceph_osd_op *dst,
276 struct ceph_osd_req_op *src)
277 {
278 dst->op = cpu_to_le16(src->op);
279
280 switch (dst->op) {
281 case CEPH_OSD_OP_READ:
282 case CEPH_OSD_OP_WRITE:
283 dst->extent.offset =
284 cpu_to_le64(src->extent.offset);
285 dst->extent.length =
286 cpu_to_le64(src->extent.length);
287 dst->extent.truncate_size =
288 cpu_to_le64(src->extent.truncate_size);
289 dst->extent.truncate_seq =
290 cpu_to_le32(src->extent.truncate_seq);
291 break;
292
293 case CEPH_OSD_OP_GETXATTR:
294 case CEPH_OSD_OP_SETXATTR:
295 case CEPH_OSD_OP_CMPXATTR:
296 BUG_ON(!req->r_trail);
297
298 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
299 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
300 dst->xattr.cmp_op = src->xattr.cmp_op;
301 dst->xattr.cmp_mode = src->xattr.cmp_mode;
302 ceph_pagelist_append(req->r_trail, src->xattr.name,
303 src->xattr.name_len);
304 ceph_pagelist_append(req->r_trail, src->xattr.val,
305 src->xattr.value_len);
306 break;
307 case CEPH_OSD_OP_CALL:
308 BUG_ON(!req->r_trail);
309
310 dst->cls.class_len = src->cls.class_len;
311 dst->cls.method_len = src->cls.method_len;
312 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
313
314 ceph_pagelist_append(req->r_trail, src->cls.class_name,
315 src->cls.class_len);
316 ceph_pagelist_append(req->r_trail, src->cls.method_name,
317 src->cls.method_len);
318 ceph_pagelist_append(req->r_trail, src->cls.indata,
319 src->cls.indata_len);
320 break;
321 case CEPH_OSD_OP_ROLLBACK:
322 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
323 break;
324 case CEPH_OSD_OP_STARTSYNC:
325 break;
326 case CEPH_OSD_OP_NOTIFY:
327 {
328 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
329 __le32 timeout = cpu_to_le32(src->watch.timeout);
330
331 BUG_ON(!req->r_trail);
332
333 ceph_pagelist_append(req->r_trail,
334 &prot_ver, sizeof(prot_ver));
335 ceph_pagelist_append(req->r_trail,
336 &timeout, sizeof(timeout));
337 }
338 case CEPH_OSD_OP_NOTIFY_ACK:
339 case CEPH_OSD_OP_WATCH:
340 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
341 dst->watch.ver = cpu_to_le64(src->watch.ver);
342 dst->watch.flag = src->watch.flag;
343 break;
344 default:
345 pr_err("unrecognized osd opcode %d\n", dst->op);
346 WARN_ON(1);
347 break;
348 }
349 dst->payload_len = cpu_to_le32(src->payload_len);
350 }
351
352 /*
353 * build new request AND message
354 *
355 */
356 void ceph_osdc_build_request(struct ceph_osd_request *req,
357 u64 off, u64 *plen,
358 struct ceph_osd_req_op *src_ops,
359 struct ceph_snap_context *snapc,
360 struct timespec *mtime,
361 const char *oid,
362 int oid_len)
363 {
364 struct ceph_msg *msg = req->r_request;
365 struct ceph_osd_request_head *head;
366 struct ceph_osd_req_op *src_op;
367 struct ceph_osd_op *op;
368 void *p;
369 int num_op = get_num_ops(src_ops, NULL);
370 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
371 int flags = req->r_flags;
372 u64 data_len = 0;
373 int i;
374
375 head = msg->front.iov_base;
376 op = (void *)(head + 1);
377 p = (void *)(op + num_op);
378
379 req->r_snapc = ceph_get_snap_context(snapc);
380
381 head->client_inc = cpu_to_le32(1); /* always, for now. */
382 head->flags = cpu_to_le32(flags);
383 if (flags & CEPH_OSD_FLAG_WRITE)
384 ceph_encode_timespec(&head->mtime, mtime);
385 head->num_ops = cpu_to_le16(num_op);
386
387
388 /* fill in oid */
389 head->object_len = cpu_to_le32(oid_len);
390 memcpy(p, oid, oid_len);
391 p += oid_len;
392
393 src_op = src_ops;
394 while (src_op->op) {
395 osd_req_encode_op(req, op, src_op);
396 src_op++;
397 op++;
398 }
399
400 if (req->r_trail)
401 data_len += req->r_trail->length;
402
403 if (snapc) {
404 head->snap_seq = cpu_to_le64(snapc->seq);
405 head->num_snaps = cpu_to_le32(snapc->num_snaps);
406 for (i = 0; i < snapc->num_snaps; i++) {
407 put_unaligned_le64(snapc->snaps[i], p);
408 p += sizeof(u64);
409 }
410 }
411
412 if (flags & CEPH_OSD_FLAG_WRITE) {
413 req->r_request->hdr.data_off = cpu_to_le16(off);
414 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
415 } else if (data_len) {
416 req->r_request->hdr.data_off = 0;
417 req->r_request->hdr.data_len = cpu_to_le32(data_len);
418 }
419
420 req->r_request->page_alignment = req->r_page_alignment;
421
422 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
423 msg_size = p - msg->front.iov_base;
424 msg->front.iov_len = msg_size;
425 msg->hdr.front_len = cpu_to_le32(msg_size);
426 return;
427 }
428 EXPORT_SYMBOL(ceph_osdc_build_request);
429
430 /*
431 * build new request AND message, calculate layout, and adjust file
432 * extent as needed.
433 *
434 * if the file was recently truncated, we include information about its
435 * old and new size so that the object can be updated appropriately. (we
436 * avoid synchronously deleting truncated objects because it's slow.)
437 *
438 * if @do_sync, include a 'startsync' command so that the osd will flush
439 * data quickly.
440 */
441 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
442 struct ceph_file_layout *layout,
443 struct ceph_vino vino,
444 u64 off, u64 *plen,
445 int opcode, int flags,
446 struct ceph_snap_context *snapc,
447 int do_sync,
448 u32 truncate_seq,
449 u64 truncate_size,
450 struct timespec *mtime,
451 bool use_mempool, int num_reply,
452 int page_align)
453 {
454 struct ceph_osd_req_op ops[3];
455 struct ceph_osd_request *req;
456
457 ops[0].op = opcode;
458 ops[0].extent.truncate_seq = truncate_seq;
459 ops[0].extent.truncate_size = truncate_size;
460 ops[0].payload_len = 0;
461
462 if (do_sync) {
463 ops[1].op = CEPH_OSD_OP_STARTSYNC;
464 ops[1].payload_len = 0;
465 ops[2].op = 0;
466 } else
467 ops[1].op = 0;
468
469 req = ceph_osdc_alloc_request(osdc, flags,
470 snapc, ops,
471 use_mempool,
472 GFP_NOFS, NULL, NULL);
473 if (IS_ERR(req))
474 return req;
475
476 /* calculate max write size */
477 calc_layout(osdc, vino, layout, off, plen, req, ops);
478 req->r_file_layout = *layout; /* keep a copy */
479
480 /* in case it differs from natural alignment that calc_layout
481 filled in for us */
482 req->r_page_alignment = page_align;
483
484 ceph_osdc_build_request(req, off, plen, ops,
485 snapc,
486 mtime,
487 req->r_oid, req->r_oid_len);
488
489 return req;
490 }
491 EXPORT_SYMBOL(ceph_osdc_new_request);
492
493 /*
494 * We keep osd requests in an rbtree, sorted by ->r_tid.
495 */
496 static void __insert_request(struct ceph_osd_client *osdc,
497 struct ceph_osd_request *new)
498 {
499 struct rb_node **p = &osdc->requests.rb_node;
500 struct rb_node *parent = NULL;
501 struct ceph_osd_request *req = NULL;
502
503 while (*p) {
504 parent = *p;
505 req = rb_entry(parent, struct ceph_osd_request, r_node);
506 if (new->r_tid < req->r_tid)
507 p = &(*p)->rb_left;
508 else if (new->r_tid > req->r_tid)
509 p = &(*p)->rb_right;
510 else
511 BUG();
512 }
513
514 rb_link_node(&new->r_node, parent, p);
515 rb_insert_color(&new->r_node, &osdc->requests);
516 }
517
518 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
519 u64 tid)
520 {
521 struct ceph_osd_request *req;
522 struct rb_node *n = osdc->requests.rb_node;
523
524 while (n) {
525 req = rb_entry(n, struct ceph_osd_request, r_node);
526 if (tid < req->r_tid)
527 n = n->rb_left;
528 else if (tid > req->r_tid)
529 n = n->rb_right;
530 else
531 return req;
532 }
533 return NULL;
534 }
535
536 static struct ceph_osd_request *
537 __lookup_request_ge(struct ceph_osd_client *osdc,
538 u64 tid)
539 {
540 struct ceph_osd_request *req;
541 struct rb_node *n = osdc->requests.rb_node;
542
543 while (n) {
544 req = rb_entry(n, struct ceph_osd_request, r_node);
545 if (tid < req->r_tid) {
546 if (!n->rb_left)
547 return req;
548 n = n->rb_left;
549 } else if (tid > req->r_tid) {
550 n = n->rb_right;
551 } else {
552 return req;
553 }
554 }
555 return NULL;
556 }
557
558 /*
559 * Resubmit requests pending on the given osd.
560 */
561 static void __kick_osd_requests(struct ceph_osd_client *osdc,
562 struct ceph_osd *osd)
563 {
564 struct ceph_osd_request *req, *nreq;
565 int err;
566
567 dout("__kick_osd_requests osd%d\n", osd->o_osd);
568 err = __reset_osd(osdc, osd);
569 if (err == -EAGAIN)
570 return;
571
572 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
573 list_move(&req->r_req_lru_item, &osdc->req_unsent);
574 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
575 osd->o_osd);
576 if (!req->r_linger)
577 req->r_flags |= CEPH_OSD_FLAG_RETRY;
578 }
579
580 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
581 r_linger_osd) {
582 __unregister_linger_request(osdc, req);
583 __register_request(osdc, req);
584 list_move(&req->r_req_lru_item, &osdc->req_unsent);
585 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
586 osd->o_osd);
587 }
588 }
589
590 static void kick_osd_requests(struct ceph_osd_client *osdc,
591 struct ceph_osd *kickosd)
592 {
593 mutex_lock(&osdc->request_mutex);
594 __kick_osd_requests(osdc, kickosd);
595 mutex_unlock(&osdc->request_mutex);
596 }
597
598 /*
599 * If the osd connection drops, we need to resubmit all requests.
600 */
601 static void osd_reset(struct ceph_connection *con)
602 {
603 struct ceph_osd *osd = con->private;
604 struct ceph_osd_client *osdc;
605
606 if (!osd)
607 return;
608 dout("osd_reset osd%d\n", osd->o_osd);
609 osdc = osd->o_osdc;
610 down_read(&osdc->map_sem);
611 kick_osd_requests(osdc, osd);
612 send_queued(osdc);
613 up_read(&osdc->map_sem);
614 }
615
616 /*
617 * Track open sessions with osds.
618 */
619 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
620 {
621 struct ceph_osd *osd;
622
623 osd = kzalloc(sizeof(*osd), GFP_NOFS);
624 if (!osd)
625 return NULL;
626
627 atomic_set(&osd->o_ref, 1);
628 osd->o_osdc = osdc;
629 INIT_LIST_HEAD(&osd->o_requests);
630 INIT_LIST_HEAD(&osd->o_linger_requests);
631 INIT_LIST_HEAD(&osd->o_osd_lru);
632 osd->o_incarnation = 1;
633
634 ceph_con_init(osdc->client->msgr, &osd->o_con);
635 osd->o_con.private = osd;
636 osd->o_con.ops = &osd_con_ops;
637 osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
638
639 INIT_LIST_HEAD(&osd->o_keepalive_item);
640 return osd;
641 }
642
643 static struct ceph_osd *get_osd(struct ceph_osd *osd)
644 {
645 if (atomic_inc_not_zero(&osd->o_ref)) {
646 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
647 atomic_read(&osd->o_ref));
648 return osd;
649 } else {
650 dout("get_osd %p FAIL\n", osd);
651 return NULL;
652 }
653 }
654
655 static void put_osd(struct ceph_osd *osd)
656 {
657 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
658 atomic_read(&osd->o_ref) - 1);
659 if (atomic_dec_and_test(&osd->o_ref)) {
660 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
661
662 if (osd->o_authorizer)
663 ac->ops->destroy_authorizer(ac, osd->o_authorizer);
664 kfree(osd);
665 }
666 }
667
668 /*
669 * remove an osd from our map
670 */
671 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
672 {
673 dout("__remove_osd %p\n", osd);
674 BUG_ON(!list_empty(&osd->o_requests));
675 rb_erase(&osd->o_node, &osdc->osds);
676 list_del_init(&osd->o_osd_lru);
677 ceph_con_close(&osd->o_con);
678 put_osd(osd);
679 }
680
681 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
682 struct ceph_osd *osd)
683 {
684 dout("__move_osd_to_lru %p\n", osd);
685 BUG_ON(!list_empty(&osd->o_osd_lru));
686 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
687 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
688 }
689
690 static void __remove_osd_from_lru(struct ceph_osd *osd)
691 {
692 dout("__remove_osd_from_lru %p\n", osd);
693 if (!list_empty(&osd->o_osd_lru))
694 list_del_init(&osd->o_osd_lru);
695 }
696
697 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
698 {
699 struct ceph_osd *osd, *nosd;
700
701 dout("__remove_old_osds %p\n", osdc);
702 mutex_lock(&osdc->request_mutex);
703 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
704 if (!remove_all && time_before(jiffies, osd->lru_ttl))
705 break;
706 __remove_osd(osdc, osd);
707 }
708 mutex_unlock(&osdc->request_mutex);
709 }
710
711 /*
712 * reset osd connect
713 */
714 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
715 {
716 struct ceph_osd_request *req;
717 int ret = 0;
718
719 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
720 if (list_empty(&osd->o_requests) &&
721 list_empty(&osd->o_linger_requests)) {
722 __remove_osd(osdc, osd);
723 } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
724 &osd->o_con.peer_addr,
725 sizeof(osd->o_con.peer_addr)) == 0 &&
726 !ceph_con_opened(&osd->o_con)) {
727 dout(" osd addr hasn't changed and connection never opened,"
728 " letting msgr retry");
729 /* touch each r_stamp for handle_timeout()'s benfit */
730 list_for_each_entry(req, &osd->o_requests, r_osd_item)
731 req->r_stamp = jiffies;
732 ret = -EAGAIN;
733 } else {
734 ceph_con_close(&osd->o_con);
735 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
736 osd->o_incarnation++;
737 }
738 return ret;
739 }
740
741 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
742 {
743 struct rb_node **p = &osdc->osds.rb_node;
744 struct rb_node *parent = NULL;
745 struct ceph_osd *osd = NULL;
746
747 while (*p) {
748 parent = *p;
749 osd = rb_entry(parent, struct ceph_osd, o_node);
750 if (new->o_osd < osd->o_osd)
751 p = &(*p)->rb_left;
752 else if (new->o_osd > osd->o_osd)
753 p = &(*p)->rb_right;
754 else
755 BUG();
756 }
757
758 rb_link_node(&new->o_node, parent, p);
759 rb_insert_color(&new->o_node, &osdc->osds);
760 }
761
762 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
763 {
764 struct ceph_osd *osd;
765 struct rb_node *n = osdc->osds.rb_node;
766
767 while (n) {
768 osd = rb_entry(n, struct ceph_osd, o_node);
769 if (o < osd->o_osd)
770 n = n->rb_left;
771 else if (o > osd->o_osd)
772 n = n->rb_right;
773 else
774 return osd;
775 }
776 return NULL;
777 }
778
779 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
780 {
781 schedule_delayed_work(&osdc->timeout_work,
782 osdc->client->options->osd_keepalive_timeout * HZ);
783 }
784
785 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
786 {
787 cancel_delayed_work(&osdc->timeout_work);
788 }
789
790 /*
791 * Register request, assign tid. If this is the first request, set up
792 * the timeout event.
793 */
794 static void __register_request(struct ceph_osd_client *osdc,
795 struct ceph_osd_request *req)
796 {
797 req->r_tid = ++osdc->last_tid;
798 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
799 INIT_LIST_HEAD(&req->r_req_lru_item);
800
801 dout("register_request %p tid %lld\n", req, req->r_tid);
802 __insert_request(osdc, req);
803 ceph_osdc_get_request(req);
804 osdc->num_requests++;
805
806 if (osdc->num_requests == 1) {
807 dout(" first request, scheduling timeout\n");
808 __schedule_osd_timeout(osdc);
809 }
810 }
811
812 static void register_request(struct ceph_osd_client *osdc,
813 struct ceph_osd_request *req)
814 {
815 mutex_lock(&osdc->request_mutex);
816 __register_request(osdc, req);
817 mutex_unlock(&osdc->request_mutex);
818 }
819
820 /*
821 * called under osdc->request_mutex
822 */
823 static void __unregister_request(struct ceph_osd_client *osdc,
824 struct ceph_osd_request *req)
825 {
826 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
827 rb_erase(&req->r_node, &osdc->requests);
828 osdc->num_requests--;
829
830 if (req->r_osd) {
831 /* make sure the original request isn't in flight. */
832 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
833
834 list_del_init(&req->r_osd_item);
835 if (list_empty(&req->r_osd->o_requests) &&
836 list_empty(&req->r_osd->o_linger_requests)) {
837 dout("moving osd to %p lru\n", req->r_osd);
838 __move_osd_to_lru(osdc, req->r_osd);
839 }
840 if (list_empty(&req->r_linger_item))
841 req->r_osd = NULL;
842 }
843
844 ceph_osdc_put_request(req);
845
846 list_del_init(&req->r_req_lru_item);
847 if (osdc->num_requests == 0) {
848 dout(" no requests, canceling timeout\n");
849 __cancel_osd_timeout(osdc);
850 }
851 }
852
853 /*
854 * Cancel a previously queued request message
855 */
856 static void __cancel_request(struct ceph_osd_request *req)
857 {
858 if (req->r_sent && req->r_osd) {
859 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
860 req->r_sent = 0;
861 }
862 }
863
864 static void __register_linger_request(struct ceph_osd_client *osdc,
865 struct ceph_osd_request *req)
866 {
867 dout("__register_linger_request %p\n", req);
868 list_add_tail(&req->r_linger_item, &osdc->req_linger);
869 list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
870 }
871
872 static void __unregister_linger_request(struct ceph_osd_client *osdc,
873 struct ceph_osd_request *req)
874 {
875 dout("__unregister_linger_request %p\n", req);
876 if (req->r_osd) {
877 list_del_init(&req->r_linger_item);
878 list_del_init(&req->r_linger_osd);
879
880 if (list_empty(&req->r_osd->o_requests) &&
881 list_empty(&req->r_osd->o_linger_requests)) {
882 dout("moving osd to %p lru\n", req->r_osd);
883 __move_osd_to_lru(osdc, req->r_osd);
884 }
885 if (list_empty(&req->r_osd_item))
886 req->r_osd = NULL;
887 }
888 }
889
890 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
891 struct ceph_osd_request *req)
892 {
893 mutex_lock(&osdc->request_mutex);
894 if (req->r_linger) {
895 __unregister_linger_request(osdc, req);
896 ceph_osdc_put_request(req);
897 }
898 mutex_unlock(&osdc->request_mutex);
899 }
900 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
901
902 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
903 struct ceph_osd_request *req)
904 {
905 if (!req->r_linger) {
906 dout("set_request_linger %p\n", req);
907 req->r_linger = 1;
908 /*
909 * caller is now responsible for calling
910 * unregister_linger_request
911 */
912 ceph_osdc_get_request(req);
913 }
914 }
915 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
916
917 /*
918 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
919 * (as needed), and set the request r_osd appropriately. If there is
920 * no up osd, set r_osd to NULL. Move the request to the appropriate list
921 * (unsent, homeless) or leave on in-flight lru.
922 *
923 * Return 0 if unchanged, 1 if changed, or negative on error.
924 *
925 * Caller should hold map_sem for read and request_mutex.
926 */
927 static int __map_request(struct ceph_osd_client *osdc,
928 struct ceph_osd_request *req)
929 {
930 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
931 struct ceph_pg pgid;
932 int acting[CEPH_PG_MAX_SIZE];
933 int o = -1, num = 0;
934 int err;
935
936 dout("map_request %p tid %lld\n", req, req->r_tid);
937 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
938 &req->r_file_layout, osdc->osdmap);
939 if (err) {
940 list_move(&req->r_req_lru_item, &osdc->req_notarget);
941 return err;
942 }
943 pgid = reqhead->layout.ol_pgid;
944 req->r_pgid = pgid;
945
946 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
947 if (err > 0) {
948 o = acting[0];
949 num = err;
950 }
951
952 if ((req->r_osd && req->r_osd->o_osd == o &&
953 req->r_sent >= req->r_osd->o_incarnation &&
954 req->r_num_pg_osds == num &&
955 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
956 (req->r_osd == NULL && o == -1))
957 return 0; /* no change */
958
959 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
960 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
961 req->r_osd ? req->r_osd->o_osd : -1);
962
963 /* record full pg acting set */
964 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
965 req->r_num_pg_osds = num;
966
967 if (req->r_osd) {
968 __cancel_request(req);
969 list_del_init(&req->r_osd_item);
970 req->r_osd = NULL;
971 }
972
973 req->r_osd = __lookup_osd(osdc, o);
974 if (!req->r_osd && o >= 0) {
975 err = -ENOMEM;
976 req->r_osd = create_osd(osdc);
977 if (!req->r_osd) {
978 list_move(&req->r_req_lru_item, &osdc->req_notarget);
979 goto out;
980 }
981
982 dout("map_request osd %p is osd%d\n", req->r_osd, o);
983 req->r_osd->o_osd = o;
984 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
985 __insert_osd(osdc, req->r_osd);
986
987 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
988 }
989
990 if (req->r_osd) {
991 __remove_osd_from_lru(req->r_osd);
992 list_add(&req->r_osd_item, &req->r_osd->o_requests);
993 list_move(&req->r_req_lru_item, &osdc->req_unsent);
994 } else {
995 list_move(&req->r_req_lru_item, &osdc->req_notarget);
996 }
997 err = 1; /* osd or pg changed */
998
999 out:
1000 return err;
1001 }
1002
1003 /*
1004 * caller should hold map_sem (for read) and request_mutex
1005 */
1006 static int __send_request(struct ceph_osd_client *osdc,
1007 struct ceph_osd_request *req)
1008 {
1009 struct ceph_osd_request_head *reqhead;
1010
1011 dout("send_request %p tid %llu to osd%d flags %d\n",
1012 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1013
1014 reqhead = req->r_request->front.iov_base;
1015 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1016 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1017 reqhead->reassert_version = req->r_reassert_version;
1018
1019 req->r_stamp = jiffies;
1020 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1021
1022 ceph_msg_get(req->r_request); /* send consumes a ref */
1023 ceph_con_send(&req->r_osd->o_con, req->r_request);
1024 req->r_sent = req->r_osd->o_incarnation;
1025 return 0;
1026 }
1027
1028 /*
1029 * Send any requests in the queue (req_unsent).
1030 */
1031 static void send_queued(struct ceph_osd_client *osdc)
1032 {
1033 struct ceph_osd_request *req, *tmp;
1034
1035 dout("send_queued\n");
1036 mutex_lock(&osdc->request_mutex);
1037 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1038 __send_request(osdc, req);
1039 }
1040 mutex_unlock(&osdc->request_mutex);
1041 }
1042
1043 /*
1044 * Timeout callback, called every N seconds when 1 or more osd
1045 * requests has been active for more than N seconds. When this
1046 * happens, we ping all OSDs with requests who have timed out to
1047 * ensure any communications channel reset is detected. Reset the
1048 * request timeouts another N seconds in the future as we go.
1049 * Reschedule the timeout event another N seconds in future (unless
1050 * there are no open requests).
1051 */
1052 static void handle_timeout(struct work_struct *work)
1053 {
1054 struct ceph_osd_client *osdc =
1055 container_of(work, struct ceph_osd_client, timeout_work.work);
1056 struct ceph_osd_request *req, *last_req = NULL;
1057 struct ceph_osd *osd;
1058 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1059 unsigned long keepalive =
1060 osdc->client->options->osd_keepalive_timeout * HZ;
1061 unsigned long last_stamp = 0;
1062 struct list_head slow_osds;
1063 dout("timeout\n");
1064 down_read(&osdc->map_sem);
1065
1066 ceph_monc_request_next_osdmap(&osdc->client->monc);
1067
1068 mutex_lock(&osdc->request_mutex);
1069
1070 /*
1071 * reset osds that appear to be _really_ unresponsive. this
1072 * is a failsafe measure.. we really shouldn't be getting to
1073 * this point if the system is working properly. the monitors
1074 * should mark the osd as failed and we should find out about
1075 * it from an updated osd map.
1076 */
1077 while (timeout && !list_empty(&osdc->req_lru)) {
1078 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1079 r_req_lru_item);
1080
1081 if (time_before(jiffies, req->r_stamp + timeout))
1082 break;
1083
1084 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1085 last_req = req;
1086 last_stamp = req->r_stamp;
1087
1088 osd = req->r_osd;
1089 BUG_ON(!osd);
1090 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1091 req->r_tid, osd->o_osd);
1092 __kick_osd_requests(osdc, osd);
1093 }
1094
1095 /*
1096 * ping osds that are a bit slow. this ensures that if there
1097 * is a break in the TCP connection we will notice, and reopen
1098 * a connection with that osd (from the fault callback).
1099 */
1100 INIT_LIST_HEAD(&slow_osds);
1101 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1102 if (time_before(jiffies, req->r_stamp + keepalive))
1103 break;
1104
1105 osd = req->r_osd;
1106 BUG_ON(!osd);
1107 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1108 req->r_tid, osd->o_osd);
1109 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1110 }
1111 while (!list_empty(&slow_osds)) {
1112 osd = list_entry(slow_osds.next, struct ceph_osd,
1113 o_keepalive_item);
1114 list_del_init(&osd->o_keepalive_item);
1115 ceph_con_keepalive(&osd->o_con);
1116 }
1117
1118 __schedule_osd_timeout(osdc);
1119 mutex_unlock(&osdc->request_mutex);
1120 send_queued(osdc);
1121 up_read(&osdc->map_sem);
1122 }
1123
1124 static void handle_osds_timeout(struct work_struct *work)
1125 {
1126 struct ceph_osd_client *osdc =
1127 container_of(work, struct ceph_osd_client,
1128 osds_timeout_work.work);
1129 unsigned long delay =
1130 osdc->client->options->osd_idle_ttl * HZ >> 2;
1131
1132 dout("osds timeout\n");
1133 down_read(&osdc->map_sem);
1134 remove_old_osds(osdc, 0);
1135 up_read(&osdc->map_sem);
1136
1137 schedule_delayed_work(&osdc->osds_timeout_work,
1138 round_jiffies_relative(delay));
1139 }
1140
1141 /*
1142 * handle osd op reply. either call the callback if it is specified,
1143 * or do the completion to wake up the waiting thread.
1144 */
1145 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1146 struct ceph_connection *con)
1147 {
1148 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1149 struct ceph_osd_request *req;
1150 u64 tid;
1151 int numops, object_len, flags;
1152 s32 result;
1153
1154 tid = le64_to_cpu(msg->hdr.tid);
1155 if (msg->front.iov_len < sizeof(*rhead))
1156 goto bad;
1157 numops = le32_to_cpu(rhead->num_ops);
1158 object_len = le32_to_cpu(rhead->object_len);
1159 result = le32_to_cpu(rhead->result);
1160 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1161 numops * sizeof(struct ceph_osd_op))
1162 goto bad;
1163 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1164 /* lookup */
1165 mutex_lock(&osdc->request_mutex);
1166 req = __lookup_request(osdc, tid);
1167 if (req == NULL) {
1168 dout("handle_reply tid %llu dne\n", tid);
1169 mutex_unlock(&osdc->request_mutex);
1170 return;
1171 }
1172 ceph_osdc_get_request(req);
1173 flags = le32_to_cpu(rhead->flags);
1174
1175 /*
1176 * if this connection filled our message, drop our reference now, to
1177 * avoid a (safe but slower) revoke later.
1178 */
1179 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1180 dout(" dropping con_filling_msg ref %p\n", con);
1181 req->r_con_filling_msg = NULL;
1182 ceph_con_put(con);
1183 }
1184
1185 if (!req->r_got_reply) {
1186 unsigned bytes;
1187
1188 req->r_result = le32_to_cpu(rhead->result);
1189 bytes = le32_to_cpu(msg->hdr.data_len);
1190 dout("handle_reply result %d bytes %d\n", req->r_result,
1191 bytes);
1192 if (req->r_result == 0)
1193 req->r_result = bytes;
1194
1195 /* in case this is a write and we need to replay, */
1196 req->r_reassert_version = rhead->reassert_version;
1197
1198 req->r_got_reply = 1;
1199 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1200 dout("handle_reply tid %llu dup ack\n", tid);
1201 mutex_unlock(&osdc->request_mutex);
1202 goto done;
1203 }
1204
1205 dout("handle_reply tid %llu flags %d\n", tid, flags);
1206
1207 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1208 __register_linger_request(osdc, req);
1209
1210 /* either this is a read, or we got the safe response */
1211 if (result < 0 ||
1212 (flags & CEPH_OSD_FLAG_ONDISK) ||
1213 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1214 __unregister_request(osdc, req);
1215
1216 mutex_unlock(&osdc->request_mutex);
1217
1218 if (req->r_callback)
1219 req->r_callback(req, msg);
1220 else
1221 complete_all(&req->r_completion);
1222
1223 if (flags & CEPH_OSD_FLAG_ONDISK) {
1224 if (req->r_safe_callback)
1225 req->r_safe_callback(req, msg);
1226 complete_all(&req->r_safe_completion); /* fsync waiter */
1227 }
1228
1229 done:
1230 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1231 ceph_osdc_put_request(req);
1232 return;
1233
1234 bad:
1235 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1236 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1237 (int)sizeof(*rhead));
1238 ceph_msg_dump(msg);
1239 }
1240
1241 static void reset_changed_osds(struct ceph_osd_client *osdc)
1242 {
1243 struct rb_node *p, *n;
1244
1245 for (p = rb_first(&osdc->osds); p; p = n) {
1246 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1247
1248 n = rb_next(p);
1249 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1250 memcmp(&osd->o_con.peer_addr,
1251 ceph_osd_addr(osdc->osdmap,
1252 osd->o_osd),
1253 sizeof(struct ceph_entity_addr)) != 0)
1254 __reset_osd(osdc, osd);
1255 }
1256 }
1257
1258 /*
1259 * Requeue requests whose mapping to an OSD has changed. If requests map to
1260 * no osd, request a new map.
1261 *
1262 * Caller should hold map_sem for read and request_mutex.
1263 */
1264 static void kick_requests(struct ceph_osd_client *osdc)
1265 {
1266 struct ceph_osd_request *req, *nreq;
1267 struct rb_node *p;
1268 int needmap = 0;
1269 int err;
1270
1271 dout("kick_requests\n");
1272 mutex_lock(&osdc->request_mutex);
1273 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1274 req = rb_entry(p, struct ceph_osd_request, r_node);
1275 err = __map_request(osdc, req);
1276 if (err < 0)
1277 continue; /* error */
1278 if (req->r_osd == NULL) {
1279 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1280 needmap++; /* request a newer map */
1281 } else if (err > 0) {
1282 dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1283 req->r_osd ? req->r_osd->o_osd : -1);
1284 if (!req->r_linger)
1285 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1286 }
1287 }
1288
1289 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1290 r_linger_item) {
1291 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1292
1293 err = __map_request(osdc, req);
1294 if (err == 0)
1295 continue; /* no change and no osd was specified */
1296 if (err < 0)
1297 continue; /* hrm! */
1298 if (req->r_osd == NULL) {
1299 dout("tid %llu maps to no valid osd\n", req->r_tid);
1300 needmap++; /* request a newer map */
1301 continue;
1302 }
1303
1304 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1305 req->r_osd ? req->r_osd->o_osd : -1);
1306 __unregister_linger_request(osdc, req);
1307 __register_request(osdc, req);
1308 }
1309 mutex_unlock(&osdc->request_mutex);
1310
1311 if (needmap) {
1312 dout("%d requests for down osds, need new map\n", needmap);
1313 ceph_monc_request_next_osdmap(&osdc->client->monc);
1314 }
1315 }
1316
1317
1318 /*
1319 * Process updated osd map.
1320 *
1321 * The message contains any number of incremental and full maps, normally
1322 * indicating some sort of topology change in the cluster. Kick requests
1323 * off to different OSDs as needed.
1324 */
1325 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1326 {
1327 void *p, *end, *next;
1328 u32 nr_maps, maplen;
1329 u32 epoch;
1330 struct ceph_osdmap *newmap = NULL, *oldmap;
1331 int err;
1332 struct ceph_fsid fsid;
1333
1334 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1335 p = msg->front.iov_base;
1336 end = p + msg->front.iov_len;
1337
1338 /* verify fsid */
1339 ceph_decode_need(&p, end, sizeof(fsid), bad);
1340 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1341 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1342 return;
1343
1344 down_write(&osdc->map_sem);
1345
1346 /* incremental maps */
1347 ceph_decode_32_safe(&p, end, nr_maps, bad);
1348 dout(" %d inc maps\n", nr_maps);
1349 while (nr_maps > 0) {
1350 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1351 epoch = ceph_decode_32(&p);
1352 maplen = ceph_decode_32(&p);
1353 ceph_decode_need(&p, end, maplen, bad);
1354 next = p + maplen;
1355 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1356 dout("applying incremental map %u len %d\n",
1357 epoch, maplen);
1358 newmap = osdmap_apply_incremental(&p, next,
1359 osdc->osdmap,
1360 osdc->client->msgr);
1361 if (IS_ERR(newmap)) {
1362 err = PTR_ERR(newmap);
1363 goto bad;
1364 }
1365 BUG_ON(!newmap);
1366 if (newmap != osdc->osdmap) {
1367 ceph_osdmap_destroy(osdc->osdmap);
1368 osdc->osdmap = newmap;
1369 }
1370 kick_requests(osdc);
1371 reset_changed_osds(osdc);
1372 } else {
1373 dout("ignoring incremental map %u len %d\n",
1374 epoch, maplen);
1375 }
1376 p = next;
1377 nr_maps--;
1378 }
1379 if (newmap)
1380 goto done;
1381
1382 /* full maps */
1383 ceph_decode_32_safe(&p, end, nr_maps, bad);
1384 dout(" %d full maps\n", nr_maps);
1385 while (nr_maps) {
1386 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1387 epoch = ceph_decode_32(&p);
1388 maplen = ceph_decode_32(&p);
1389 ceph_decode_need(&p, end, maplen, bad);
1390 if (nr_maps > 1) {
1391 dout("skipping non-latest full map %u len %d\n",
1392 epoch, maplen);
1393 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1394 dout("skipping full map %u len %d, "
1395 "older than our %u\n", epoch, maplen,
1396 osdc->osdmap->epoch);
1397 } else {
1398 dout("taking full map %u len %d\n", epoch, maplen);
1399 newmap = osdmap_decode(&p, p+maplen);
1400 if (IS_ERR(newmap)) {
1401 err = PTR_ERR(newmap);
1402 goto bad;
1403 }
1404 BUG_ON(!newmap);
1405 oldmap = osdc->osdmap;
1406 osdc->osdmap = newmap;
1407 if (oldmap)
1408 ceph_osdmap_destroy(oldmap);
1409 kick_requests(osdc);
1410 }
1411 p += maplen;
1412 nr_maps--;
1413 }
1414
1415 done:
1416 downgrade_write(&osdc->map_sem);
1417 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1418 send_queued(osdc);
1419 up_read(&osdc->map_sem);
1420 wake_up_all(&osdc->client->auth_wq);
1421 return;
1422
1423 bad:
1424 pr_err("osdc handle_map corrupt msg\n");
1425 ceph_msg_dump(msg);
1426 up_write(&osdc->map_sem);
1427 return;
1428 }
1429
1430 /*
1431 * watch/notify callback event infrastructure
1432 *
1433 * These callbacks are used both for watch and notify operations.
1434 */
1435 static void __release_event(struct kref *kref)
1436 {
1437 struct ceph_osd_event *event =
1438 container_of(kref, struct ceph_osd_event, kref);
1439
1440 dout("__release_event %p\n", event);
1441 kfree(event);
1442 }
1443
1444 static void get_event(struct ceph_osd_event *event)
1445 {
1446 kref_get(&event->kref);
1447 }
1448
1449 void ceph_osdc_put_event(struct ceph_osd_event *event)
1450 {
1451 kref_put(&event->kref, __release_event);
1452 }
1453 EXPORT_SYMBOL(ceph_osdc_put_event);
1454
1455 static void __insert_event(struct ceph_osd_client *osdc,
1456 struct ceph_osd_event *new)
1457 {
1458 struct rb_node **p = &osdc->event_tree.rb_node;
1459 struct rb_node *parent = NULL;
1460 struct ceph_osd_event *event = NULL;
1461
1462 while (*p) {
1463 parent = *p;
1464 event = rb_entry(parent, struct ceph_osd_event, node);
1465 if (new->cookie < event->cookie)
1466 p = &(*p)->rb_left;
1467 else if (new->cookie > event->cookie)
1468 p = &(*p)->rb_right;
1469 else
1470 BUG();
1471 }
1472
1473 rb_link_node(&new->node, parent, p);
1474 rb_insert_color(&new->node, &osdc->event_tree);
1475 }
1476
1477 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1478 u64 cookie)
1479 {
1480 struct rb_node **p = &osdc->event_tree.rb_node;
1481 struct rb_node *parent = NULL;
1482 struct ceph_osd_event *event = NULL;
1483
1484 while (*p) {
1485 parent = *p;
1486 event = rb_entry(parent, struct ceph_osd_event, node);
1487 if (cookie < event->cookie)
1488 p = &(*p)->rb_left;
1489 else if (cookie > event->cookie)
1490 p = &(*p)->rb_right;
1491 else
1492 return event;
1493 }
1494 return NULL;
1495 }
1496
1497 static void __remove_event(struct ceph_osd_event *event)
1498 {
1499 struct ceph_osd_client *osdc = event->osdc;
1500
1501 if (!RB_EMPTY_NODE(&event->node)) {
1502 dout("__remove_event removed %p\n", event);
1503 rb_erase(&event->node, &osdc->event_tree);
1504 ceph_osdc_put_event(event);
1505 } else {
1506 dout("__remove_event didn't remove %p\n", event);
1507 }
1508 }
1509
1510 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1511 void (*event_cb)(u64, u64, u8, void *),
1512 int one_shot, void *data,
1513 struct ceph_osd_event **pevent)
1514 {
1515 struct ceph_osd_event *event;
1516
1517 event = kmalloc(sizeof(*event), GFP_NOIO);
1518 if (!event)
1519 return -ENOMEM;
1520
1521 dout("create_event %p\n", event);
1522 event->cb = event_cb;
1523 event->one_shot = one_shot;
1524 event->data = data;
1525 event->osdc = osdc;
1526 INIT_LIST_HEAD(&event->osd_node);
1527 kref_init(&event->kref); /* one ref for us */
1528 kref_get(&event->kref); /* one ref for the caller */
1529 init_completion(&event->completion);
1530
1531 spin_lock(&osdc->event_lock);
1532 event->cookie = ++osdc->event_count;
1533 __insert_event(osdc, event);
1534 spin_unlock(&osdc->event_lock);
1535
1536 *pevent = event;
1537 return 0;
1538 }
1539 EXPORT_SYMBOL(ceph_osdc_create_event);
1540
1541 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1542 {
1543 struct ceph_osd_client *osdc = event->osdc;
1544
1545 dout("cancel_event %p\n", event);
1546 spin_lock(&osdc->event_lock);
1547 __remove_event(event);
1548 spin_unlock(&osdc->event_lock);
1549 ceph_osdc_put_event(event); /* caller's */
1550 }
1551 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1552
1553
1554 static void do_event_work(struct work_struct *work)
1555 {
1556 struct ceph_osd_event_work *event_work =
1557 container_of(work, struct ceph_osd_event_work, work);
1558 struct ceph_osd_event *event = event_work->event;
1559 u64 ver = event_work->ver;
1560 u64 notify_id = event_work->notify_id;
1561 u8 opcode = event_work->opcode;
1562
1563 dout("do_event_work completing %p\n", event);
1564 event->cb(ver, notify_id, opcode, event->data);
1565 complete(&event->completion);
1566 dout("do_event_work completed %p\n", event);
1567 ceph_osdc_put_event(event);
1568 kfree(event_work);
1569 }
1570
1571
1572 /*
1573 * Process osd watch notifications
1574 */
1575 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1576 {
1577 void *p, *end;
1578 u8 proto_ver;
1579 u64 cookie, ver, notify_id;
1580 u8 opcode;
1581 struct ceph_osd_event *event;
1582 struct ceph_osd_event_work *event_work;
1583
1584 p = msg->front.iov_base;
1585 end = p + msg->front.iov_len;
1586
1587 ceph_decode_8_safe(&p, end, proto_ver, bad);
1588 ceph_decode_8_safe(&p, end, opcode, bad);
1589 ceph_decode_64_safe(&p, end, cookie, bad);
1590 ceph_decode_64_safe(&p, end, ver, bad);
1591 ceph_decode_64_safe(&p, end, notify_id, bad);
1592
1593 spin_lock(&osdc->event_lock);
1594 event = __find_event(osdc, cookie);
1595 if (event) {
1596 get_event(event);
1597 if (event->one_shot)
1598 __remove_event(event);
1599 }
1600 spin_unlock(&osdc->event_lock);
1601 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1602 cookie, ver, event);
1603 if (event) {
1604 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1605 if (!event_work) {
1606 dout("ERROR: could not allocate event_work\n");
1607 goto done_err;
1608 }
1609 INIT_WORK(&event_work->work, do_event_work);
1610 event_work->event = event;
1611 event_work->ver = ver;
1612 event_work->notify_id = notify_id;
1613 event_work->opcode = opcode;
1614 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1615 dout("WARNING: failed to queue notify event work\n");
1616 goto done_err;
1617 }
1618 }
1619
1620 return;
1621
1622 done_err:
1623 complete(&event->completion);
1624 ceph_osdc_put_event(event);
1625 return;
1626
1627 bad:
1628 pr_err("osdc handle_watch_notify corrupt msg\n");
1629 return;
1630 }
1631
1632 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1633 {
1634 int err;
1635
1636 dout("wait_event %p\n", event);
1637 err = wait_for_completion_interruptible_timeout(&event->completion,
1638 timeout * HZ);
1639 ceph_osdc_put_event(event);
1640 if (err > 0)
1641 err = 0;
1642 dout("wait_event %p returns %d\n", event, err);
1643 return err;
1644 }
1645 EXPORT_SYMBOL(ceph_osdc_wait_event);
1646
1647 /*
1648 * Register request, send initial attempt.
1649 */
1650 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1651 struct ceph_osd_request *req,
1652 bool nofail)
1653 {
1654 int rc = 0;
1655
1656 req->r_request->pages = req->r_pages;
1657 req->r_request->nr_pages = req->r_num_pages;
1658 #ifdef CONFIG_BLOCK
1659 req->r_request->bio = req->r_bio;
1660 #endif
1661 req->r_request->trail = req->r_trail;
1662
1663 register_request(osdc, req);
1664
1665 down_read(&osdc->map_sem);
1666 mutex_lock(&osdc->request_mutex);
1667 /*
1668 * a racing kick_requests() may have sent the message for us
1669 * while we dropped request_mutex above, so only send now if
1670 * the request still han't been touched yet.
1671 */
1672 if (req->r_sent == 0) {
1673 rc = __map_request(osdc, req);
1674 if (rc < 0)
1675 goto out_unlock;
1676 if (req->r_osd == NULL) {
1677 dout("send_request %p no up osds in pg\n", req);
1678 ceph_monc_request_next_osdmap(&osdc->client->monc);
1679 } else {
1680 rc = __send_request(osdc, req);
1681 if (rc) {
1682 if (nofail) {
1683 dout("osdc_start_request failed send, "
1684 " will retry %lld\n", req->r_tid);
1685 rc = 0;
1686 } else {
1687 __unregister_request(osdc, req);
1688 }
1689 }
1690 }
1691 }
1692
1693 out_unlock:
1694 mutex_unlock(&osdc->request_mutex);
1695 up_read(&osdc->map_sem);
1696 return rc;
1697 }
1698 EXPORT_SYMBOL(ceph_osdc_start_request);
1699
1700 /*
1701 * wait for a request to complete
1702 */
1703 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1704 struct ceph_osd_request *req)
1705 {
1706 int rc;
1707
1708 rc = wait_for_completion_interruptible(&req->r_completion);
1709 if (rc < 0) {
1710 mutex_lock(&osdc->request_mutex);
1711 __cancel_request(req);
1712 __unregister_request(osdc, req);
1713 mutex_unlock(&osdc->request_mutex);
1714 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1715 return rc;
1716 }
1717
1718 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1719 return req->r_result;
1720 }
1721 EXPORT_SYMBOL(ceph_osdc_wait_request);
1722
1723 /*
1724 * sync - wait for all in-flight requests to flush. avoid starvation.
1725 */
1726 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1727 {
1728 struct ceph_osd_request *req;
1729 u64 last_tid, next_tid = 0;
1730
1731 mutex_lock(&osdc->request_mutex);
1732 last_tid = osdc->last_tid;
1733 while (1) {
1734 req = __lookup_request_ge(osdc, next_tid);
1735 if (!req)
1736 break;
1737 if (req->r_tid > last_tid)
1738 break;
1739
1740 next_tid = req->r_tid + 1;
1741 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1742 continue;
1743
1744 ceph_osdc_get_request(req);
1745 mutex_unlock(&osdc->request_mutex);
1746 dout("sync waiting on tid %llu (last is %llu)\n",
1747 req->r_tid, last_tid);
1748 wait_for_completion(&req->r_safe_completion);
1749 mutex_lock(&osdc->request_mutex);
1750 ceph_osdc_put_request(req);
1751 }
1752 mutex_unlock(&osdc->request_mutex);
1753 dout("sync done (thru tid %llu)\n", last_tid);
1754 }
1755 EXPORT_SYMBOL(ceph_osdc_sync);
1756
1757 /*
1758 * init, shutdown
1759 */
1760 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1761 {
1762 int err;
1763
1764 dout("init\n");
1765 osdc->client = client;
1766 osdc->osdmap = NULL;
1767 init_rwsem(&osdc->map_sem);
1768 init_completion(&osdc->map_waiters);
1769 osdc->last_requested_map = 0;
1770 mutex_init(&osdc->request_mutex);
1771 osdc->last_tid = 0;
1772 osdc->osds = RB_ROOT;
1773 INIT_LIST_HEAD(&osdc->osd_lru);
1774 osdc->requests = RB_ROOT;
1775 INIT_LIST_HEAD(&osdc->req_lru);
1776 INIT_LIST_HEAD(&osdc->req_unsent);
1777 INIT_LIST_HEAD(&osdc->req_notarget);
1778 INIT_LIST_HEAD(&osdc->req_linger);
1779 osdc->num_requests = 0;
1780 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1781 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1782 spin_lock_init(&osdc->event_lock);
1783 osdc->event_tree = RB_ROOT;
1784 osdc->event_count = 0;
1785
1786 schedule_delayed_work(&osdc->osds_timeout_work,
1787 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1788
1789 err = -ENOMEM;
1790 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1791 sizeof(struct ceph_osd_request));
1792 if (!osdc->req_mempool)
1793 goto out;
1794
1795 err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1796 "osd_op");
1797 if (err < 0)
1798 goto out_mempool;
1799 err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1800 OSD_OPREPLY_FRONT_LEN, 10, true,
1801 "osd_op_reply");
1802 if (err < 0)
1803 goto out_msgpool;
1804
1805 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1806 if (IS_ERR(osdc->notify_wq)) {
1807 err = PTR_ERR(osdc->notify_wq);
1808 osdc->notify_wq = NULL;
1809 goto out_msgpool;
1810 }
1811 return 0;
1812
1813 out_msgpool:
1814 ceph_msgpool_destroy(&osdc->msgpool_op);
1815 out_mempool:
1816 mempool_destroy(osdc->req_mempool);
1817 out:
1818 return err;
1819 }
1820 EXPORT_SYMBOL(ceph_osdc_init);
1821
1822 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1823 {
1824 flush_workqueue(osdc->notify_wq);
1825 destroy_workqueue(osdc->notify_wq);
1826 cancel_delayed_work_sync(&osdc->timeout_work);
1827 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1828 if (osdc->osdmap) {
1829 ceph_osdmap_destroy(osdc->osdmap);
1830 osdc->osdmap = NULL;
1831 }
1832 remove_old_osds(osdc, 1);
1833 WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
1834 mempool_destroy(osdc->req_mempool);
1835 ceph_msgpool_destroy(&osdc->msgpool_op);
1836 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1837 }
1838 EXPORT_SYMBOL(ceph_osdc_stop);
1839
1840 /*
1841 * Read some contiguous pages. If we cross a stripe boundary, shorten
1842 * *plen. Return number of bytes read, or error.
1843 */
1844 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1845 struct ceph_vino vino, struct ceph_file_layout *layout,
1846 u64 off, u64 *plen,
1847 u32 truncate_seq, u64 truncate_size,
1848 struct page **pages, int num_pages, int page_align)
1849 {
1850 struct ceph_osd_request *req;
1851 int rc = 0;
1852
1853 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1854 vino.snap, off, *plen);
1855 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1856 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1857 NULL, 0, truncate_seq, truncate_size, NULL,
1858 false, 1, page_align);
1859 if (!req)
1860 return -ENOMEM;
1861
1862 /* it may be a short read due to an object boundary */
1863 req->r_pages = pages;
1864
1865 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1866 off, *plen, req->r_num_pages, page_align);
1867
1868 rc = ceph_osdc_start_request(osdc, req, false);
1869 if (!rc)
1870 rc = ceph_osdc_wait_request(osdc, req);
1871
1872 ceph_osdc_put_request(req);
1873 dout("readpages result %d\n", rc);
1874 return rc;
1875 }
1876 EXPORT_SYMBOL(ceph_osdc_readpages);
1877
1878 /*
1879 * do a synchronous write on N pages
1880 */
1881 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1882 struct ceph_file_layout *layout,
1883 struct ceph_snap_context *snapc,
1884 u64 off, u64 len,
1885 u32 truncate_seq, u64 truncate_size,
1886 struct timespec *mtime,
1887 struct page **pages, int num_pages,
1888 int flags, int do_sync, bool nofail)
1889 {
1890 struct ceph_osd_request *req;
1891 int rc = 0;
1892 int page_align = off & ~PAGE_MASK;
1893
1894 BUG_ON(vino.snap != CEPH_NOSNAP);
1895 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1896 CEPH_OSD_OP_WRITE,
1897 flags | CEPH_OSD_FLAG_ONDISK |
1898 CEPH_OSD_FLAG_WRITE,
1899 snapc, do_sync,
1900 truncate_seq, truncate_size, mtime,
1901 nofail, 1, page_align);
1902 if (!req)
1903 return -ENOMEM;
1904
1905 /* it may be a short write due to an object boundary */
1906 req->r_pages = pages;
1907 dout("writepages %llu~%llu (%d pages)\n", off, len,
1908 req->r_num_pages);
1909
1910 rc = ceph_osdc_start_request(osdc, req, nofail);
1911 if (!rc)
1912 rc = ceph_osdc_wait_request(osdc, req);
1913
1914 ceph_osdc_put_request(req);
1915 if (rc == 0)
1916 rc = len;
1917 dout("writepages result %d\n", rc);
1918 return rc;
1919 }
1920 EXPORT_SYMBOL(ceph_osdc_writepages);
1921
1922 /*
1923 * handle incoming message
1924 */
1925 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1926 {
1927 struct ceph_osd *osd = con->private;
1928 struct ceph_osd_client *osdc;
1929 int type = le16_to_cpu(msg->hdr.type);
1930
1931 if (!osd)
1932 goto out;
1933 osdc = osd->o_osdc;
1934
1935 switch (type) {
1936 case CEPH_MSG_OSD_MAP:
1937 ceph_osdc_handle_map(osdc, msg);
1938 break;
1939 case CEPH_MSG_OSD_OPREPLY:
1940 handle_reply(osdc, msg, con);
1941 break;
1942 case CEPH_MSG_WATCH_NOTIFY:
1943 handle_watch_notify(osdc, msg);
1944 break;
1945
1946 default:
1947 pr_err("received unknown message type %d %s\n", type,
1948 ceph_msg_type_name(type));
1949 }
1950 out:
1951 ceph_msg_put(msg);
1952 }
1953
1954 /*
1955 * lookup and return message for incoming reply. set up reply message
1956 * pages.
1957 */
1958 static struct ceph_msg *get_reply(struct ceph_connection *con,
1959 struct ceph_msg_header *hdr,
1960 int *skip)
1961 {
1962 struct ceph_osd *osd = con->private;
1963 struct ceph_osd_client *osdc = osd->o_osdc;
1964 struct ceph_msg *m;
1965 struct ceph_osd_request *req;
1966 int front = le32_to_cpu(hdr->front_len);
1967 int data_len = le32_to_cpu(hdr->data_len);
1968 u64 tid;
1969
1970 tid = le64_to_cpu(hdr->tid);
1971 mutex_lock(&osdc->request_mutex);
1972 req = __lookup_request(osdc, tid);
1973 if (!req) {
1974 *skip = 1;
1975 m = NULL;
1976 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1977 osd->o_osd);
1978 goto out;
1979 }
1980
1981 if (req->r_con_filling_msg) {
1982 dout("get_reply revoking msg %p from old con %p\n",
1983 req->r_reply, req->r_con_filling_msg);
1984 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1985 ceph_con_put(req->r_con_filling_msg);
1986 req->r_con_filling_msg = NULL;
1987 }
1988
1989 if (front > req->r_reply->front.iov_len) {
1990 pr_warning("get_reply front %d > preallocated %d\n",
1991 front, (int)req->r_reply->front.iov_len);
1992 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
1993 if (!m)
1994 goto out;
1995 ceph_msg_put(req->r_reply);
1996 req->r_reply = m;
1997 }
1998 m = ceph_msg_get(req->r_reply);
1999
2000 if (data_len > 0) {
2001 int want = calc_pages_for(req->r_page_alignment, data_len);
2002
2003 if (unlikely(req->r_num_pages < want)) {
2004 pr_warning("tid %lld reply %d > expected %d pages\n",
2005 tid, want, m->nr_pages);
2006 *skip = 1;
2007 ceph_msg_put(m);
2008 m = NULL;
2009 goto out;
2010 }
2011 m->pages = req->r_pages;
2012 m->nr_pages = req->r_num_pages;
2013 m->page_alignment = req->r_page_alignment;
2014 #ifdef CONFIG_BLOCK
2015 m->bio = req->r_bio;
2016 #endif
2017 }
2018 *skip = 0;
2019 req->r_con_filling_msg = ceph_con_get(con);
2020 dout("get_reply tid %lld %p\n", tid, m);
2021
2022 out:
2023 mutex_unlock(&osdc->request_mutex);
2024 return m;
2025
2026 }
2027
2028 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2029 struct ceph_msg_header *hdr,
2030 int *skip)
2031 {
2032 struct ceph_osd *osd = con->private;
2033 int type = le16_to_cpu(hdr->type);
2034 int front = le32_to_cpu(hdr->front_len);
2035
2036 switch (type) {
2037 case CEPH_MSG_OSD_MAP:
2038 case CEPH_MSG_WATCH_NOTIFY:
2039 return ceph_msg_new(type, front, GFP_NOFS);
2040 case CEPH_MSG_OSD_OPREPLY:
2041 return get_reply(con, hdr, skip);
2042 default:
2043 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2044 osd->o_osd);
2045 *skip = 1;
2046 return NULL;
2047 }
2048 }
2049
2050 /*
2051 * Wrappers to refcount containing ceph_osd struct
2052 */
2053 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2054 {
2055 struct ceph_osd *osd = con->private;
2056 if (get_osd(osd))
2057 return con;
2058 return NULL;
2059 }
2060
2061 static void put_osd_con(struct ceph_connection *con)
2062 {
2063 struct ceph_osd *osd = con->private;
2064 put_osd(osd);
2065 }
2066
2067 /*
2068 * authentication
2069 */
2070 static int get_authorizer(struct ceph_connection *con,
2071 void **buf, int *len, int *proto,
2072 void **reply_buf, int *reply_len, int force_new)
2073 {
2074 struct ceph_osd *o = con->private;
2075 struct ceph_osd_client *osdc = o->o_osdc;
2076 struct ceph_auth_client *ac = osdc->client->monc.auth;
2077 int ret = 0;
2078
2079 if (force_new && o->o_authorizer) {
2080 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2081 o->o_authorizer = NULL;
2082 }
2083 if (o->o_authorizer == NULL) {
2084 ret = ac->ops->create_authorizer(
2085 ac, CEPH_ENTITY_TYPE_OSD,
2086 &o->o_authorizer,
2087 &o->o_authorizer_buf,
2088 &o->o_authorizer_buf_len,
2089 &o->o_authorizer_reply_buf,
2090 &o->o_authorizer_reply_buf_len);
2091 if (ret)
2092 return ret;
2093 }
2094
2095 *proto = ac->protocol;
2096 *buf = o->o_authorizer_buf;
2097 *len = o->o_authorizer_buf_len;
2098 *reply_buf = o->o_authorizer_reply_buf;
2099 *reply_len = o->o_authorizer_reply_buf_len;
2100 return 0;
2101 }
2102
2103
2104 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2105 {
2106 struct ceph_osd *o = con->private;
2107 struct ceph_osd_client *osdc = o->o_osdc;
2108 struct ceph_auth_client *ac = osdc->client->monc.auth;
2109
2110 return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2111 }
2112
2113 static int invalidate_authorizer(struct ceph_connection *con)
2114 {
2115 struct ceph_osd *o = con->private;
2116 struct ceph_osd_client *osdc = o->o_osdc;
2117 struct ceph_auth_client *ac = osdc->client->monc.auth;
2118
2119 if (ac->ops->invalidate_authorizer)
2120 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2121
2122 return ceph_monc_validate_auth(&osdc->client->monc);
2123 }
2124
2125 static const struct ceph_connection_operations osd_con_ops = {
2126 .get = get_osd_con,
2127 .put = put_osd_con,
2128 .dispatch = dispatch,
2129 .get_authorizer = get_authorizer,
2130 .verify_authorizer_reply = verify_authorizer_reply,
2131 .invalidate_authorizer = invalidate_authorizer,
2132 .alloc_msg = alloc_msg,
2133 .fault = osd_reset,
2134 };
kernel-based virtual machine