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ARM: EXYNOS4: Modify PMU register setting function
[linux-2.6/btrfs-unstable.git] / net / ceph / osd_client.c
blob16836a7df7a6364c5f6823975d559ff3b30106a2
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/err.h>
5 #include <linux/highmem.h>
6 #include <linux/mm.h>
7 #include <linux/pagemap.h>
8 #include <linux/slab.h>
9 #include <linux/uaccess.h>
10 #ifdef CONFIG_BLOCK
11 #include <linux/bio.h>
12 #endif
13
14 #include <linux/ceph/libceph.h>
15 #include <linux/ceph/osd_client.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/decode.h>
18 #include <linux/ceph/auth.h>
19 #include <linux/ceph/pagelist.h>
20
21 #define OSD_OP_FRONT_LEN 4096
22 #define OSD_OPREPLY_FRONT_LEN 512
23
24 static const struct ceph_connection_operations osd_con_ops;
25
26 static void send_queued(struct ceph_osd_client *osdc);
27 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
28 static void __register_request(struct ceph_osd_client *osdc,
29 struct ceph_osd_request *req);
30 static void __unregister_linger_request(struct ceph_osd_client *osdc,
31 struct ceph_osd_request *req);
32 static int __send_request(struct ceph_osd_client *osdc,
33 struct ceph_osd_request *req);
34
35 static int op_needs_trail(int op)
36 {
37 switch (op) {
38 case CEPH_OSD_OP_GETXATTR:
39 case CEPH_OSD_OP_SETXATTR:
40 case CEPH_OSD_OP_CMPXATTR:
41 case CEPH_OSD_OP_CALL:
42 case CEPH_OSD_OP_NOTIFY:
43 return 1;
44 default:
45 return 0;
46 }
47 }
48
49 static int op_has_extent(int op)
50 {
51 return (op == CEPH_OSD_OP_READ ||
52 op == CEPH_OSD_OP_WRITE);
53 }
54
55 void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
56 struct ceph_file_layout *layout,
57 u64 snapid,
58 u64 off, u64 *plen, u64 *bno,
59 struct ceph_osd_request *req,
60 struct ceph_osd_req_op *op)
61 {
62 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
63 u64 orig_len = *plen;
64 u64 objoff, objlen; /* extent in object */
65
66 reqhead->snapid = cpu_to_le64(snapid);
67
68 /* object extent? */
69 ceph_calc_file_object_mapping(layout, off, plen, bno,
70 &objoff, &objlen);
71 if (*plen < orig_len)
72 dout(" skipping last %llu, final file extent %llu~%llu\n",
73 orig_len - *plen, off, *plen);
74
75 if (op_has_extent(op->op)) {
76 op->extent.offset = objoff;
77 op->extent.length = objlen;
78 }
79 req->r_num_pages = calc_pages_for(off, *plen);
80 req->r_page_alignment = off & ~PAGE_MASK;
81 if (op->op == CEPH_OSD_OP_WRITE)
82 op->payload_len = *plen;
83
84 dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
85 *bno, objoff, objlen, req->r_num_pages);
86
87 }
88 EXPORT_SYMBOL(ceph_calc_raw_layout);
89
90 /*
91 * Implement client access to distributed object storage cluster.
92 *
93 * All data objects are stored within a cluster/cloud of OSDs, or
94 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
95 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
96 * remote daemons serving up and coordinating consistent and safe
97 * access to storage.
98 *
99 * Cluster membership and the mapping of data objects onto storage devices
100 * are described by the osd map.
101 *
102 * We keep track of pending OSD requests (read, write), resubmit
103 * requests to different OSDs when the cluster topology/data layout
104 * change, or retry the affected requests when the communications
105 * channel with an OSD is reset.
106 */
107
108 /*
109 * calculate the mapping of a file extent onto an object, and fill out the
110 * request accordingly. shorten extent as necessary if it crosses an
111 * object boundary.
112 *
113 * fill osd op in request message.
114 */
115 static void calc_layout(struct ceph_osd_client *osdc,
116 struct ceph_vino vino,
117 struct ceph_file_layout *layout,
118 u64 off, u64 *plen,
119 struct ceph_osd_request *req,
120 struct ceph_osd_req_op *op)
121 {
122 u64 bno;
123
124 ceph_calc_raw_layout(osdc, layout, vino.snap, off,
125 plen, &bno, req, op);
126
127 snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
128 req->r_oid_len = strlen(req->r_oid);
129 }
130
131 /*
132 * requests
133 */
134 void ceph_osdc_release_request(struct kref *kref)
135 {
136 struct ceph_osd_request *req = container_of(kref,
137 struct ceph_osd_request,
138 r_kref);
139
140 if (req->r_request)
141 ceph_msg_put(req->r_request);
142 if (req->r_reply)
143 ceph_msg_put(req->r_reply);
144 if (req->r_con_filling_msg) {
145 dout("release_request revoking pages %p from con %p\n",
146 req->r_pages, req->r_con_filling_msg);
147 ceph_con_revoke_message(req->r_con_filling_msg,
148 req->r_reply);
149 ceph_con_put(req->r_con_filling_msg);
150 }
151 if (req->r_own_pages)
152 ceph_release_page_vector(req->r_pages,
153 req->r_num_pages);
154 #ifdef CONFIG_BLOCK
155 if (req->r_bio)
156 bio_put(req->r_bio);
157 #endif
158 ceph_put_snap_context(req->r_snapc);
159 if (req->r_trail) {
160 ceph_pagelist_release(req->r_trail);
161 kfree(req->r_trail);
162 }
163 if (req->r_mempool)
164 mempool_free(req, req->r_osdc->req_mempool);
165 else
166 kfree(req);
167 }
168 EXPORT_SYMBOL(ceph_osdc_release_request);
169
170 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
171 {
172 int i = 0;
173
174 if (needs_trail)
175 *needs_trail = 0;
176 while (ops[i].op) {
177 if (needs_trail && op_needs_trail(ops[i].op))
178 *needs_trail = 1;
179 i++;
180 }
181
182 return i;
183 }
184
185 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
186 int flags,
187 struct ceph_snap_context *snapc,
188 struct ceph_osd_req_op *ops,
189 bool use_mempool,
190 gfp_t gfp_flags,
191 struct page **pages,
192 struct bio *bio)
193 {
194 struct ceph_osd_request *req;
195 struct ceph_msg *msg;
196 int needs_trail;
197 int num_op = get_num_ops(ops, &needs_trail);
198 size_t msg_size = sizeof(struct ceph_osd_request_head);
199
200 msg_size += num_op*sizeof(struct ceph_osd_op);
201
202 if (use_mempool) {
203 req = mempool_alloc(osdc->req_mempool, gfp_flags);
204 memset(req, 0, sizeof(*req));
205 } else {
206 req = kzalloc(sizeof(*req), gfp_flags);
207 }
208 if (req == NULL)
209 return NULL;
210
211 req->r_osdc = osdc;
212 req->r_mempool = use_mempool;
213
214 kref_init(&req->r_kref);
215 init_completion(&req->r_completion);
216 init_completion(&req->r_safe_completion);
217 INIT_LIST_HEAD(&req->r_unsafe_item);
218 INIT_LIST_HEAD(&req->r_linger_item);
219 INIT_LIST_HEAD(&req->r_linger_osd);
220 req->r_flags = flags;
221
222 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
223
224 /* create reply message */
225 if (use_mempool)
226 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
227 else
228 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
229 OSD_OPREPLY_FRONT_LEN, gfp_flags);
230 if (!msg) {
231 ceph_osdc_put_request(req);
232 return NULL;
233 }
234 req->r_reply = msg;
235
236 /* allocate space for the trailing data */
237 if (needs_trail) {
238 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
239 if (!req->r_trail) {
240 ceph_osdc_put_request(req);
241 return NULL;
242 }
243 ceph_pagelist_init(req->r_trail);
244 }
245 /* create request message; allow space for oid */
246 msg_size += 40;
247 if (snapc)
248 msg_size += sizeof(u64) * snapc->num_snaps;
249 if (use_mempool)
250 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
251 else
252 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
253 if (!msg) {
254 ceph_osdc_put_request(req);
255 return NULL;
256 }
257
258 msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
259 memset(msg->front.iov_base, 0, msg->front.iov_len);
260
261 req->r_request = msg;
262 req->r_pages = pages;
263 #ifdef CONFIG_BLOCK
264 if (bio) {
265 req->r_bio = bio;
266 bio_get(req->r_bio);
267 }
268 #endif
269
270 return req;
271 }
272 EXPORT_SYMBOL(ceph_osdc_alloc_request);
273
274 static void osd_req_encode_op(struct ceph_osd_request *req,
275 struct ceph_osd_op *dst,
276 struct ceph_osd_req_op *src)
277 {
278 dst->op = cpu_to_le16(src->op);
279
280 switch (dst->op) {
281 case CEPH_OSD_OP_READ:
282 case CEPH_OSD_OP_WRITE:
283 dst->extent.offset =
284 cpu_to_le64(src->extent.offset);
285 dst->extent.length =
286 cpu_to_le64(src->extent.length);
287 dst->extent.truncate_size =
288 cpu_to_le64(src->extent.truncate_size);
289 dst->extent.truncate_seq =
290 cpu_to_le32(src->extent.truncate_seq);
291 break;
292
293 case CEPH_OSD_OP_GETXATTR:
294 case CEPH_OSD_OP_SETXATTR:
295 case CEPH_OSD_OP_CMPXATTR:
296 BUG_ON(!req->r_trail);
297
298 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
299 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
300 dst->xattr.cmp_op = src->xattr.cmp_op;
301 dst->xattr.cmp_mode = src->xattr.cmp_mode;
302 ceph_pagelist_append(req->r_trail, src->xattr.name,
303 src->xattr.name_len);
304 ceph_pagelist_append(req->r_trail, src->xattr.val,
305 src->xattr.value_len);
306 break;
307 case CEPH_OSD_OP_CALL:
308 BUG_ON(!req->r_trail);
309
310 dst->cls.class_len = src->cls.class_len;
311 dst->cls.method_len = src->cls.method_len;
312 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
313
314 ceph_pagelist_append(req->r_trail, src->cls.class_name,
315 src->cls.class_len);
316 ceph_pagelist_append(req->r_trail, src->cls.method_name,
317 src->cls.method_len);
318 ceph_pagelist_append(req->r_trail, src->cls.indata,
319 src->cls.indata_len);
320 break;
321 case CEPH_OSD_OP_ROLLBACK:
322 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
323 break;
324 case CEPH_OSD_OP_STARTSYNC:
325 break;
326 case CEPH_OSD_OP_NOTIFY:
327 {
328 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
329 __le32 timeout = cpu_to_le32(src->watch.timeout);
330
331 BUG_ON(!req->r_trail);
332
333 ceph_pagelist_append(req->r_trail,
334 &prot_ver, sizeof(prot_ver));
335 ceph_pagelist_append(req->r_trail,
336 &timeout, sizeof(timeout));
337 }
338 case CEPH_OSD_OP_NOTIFY_ACK:
339 case CEPH_OSD_OP_WATCH:
340 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
341 dst->watch.ver = cpu_to_le64(src->watch.ver);
342 dst->watch.flag = src->watch.flag;
343 break;
344 default:
345 pr_err("unrecognized osd opcode %d\n", dst->op);
346 WARN_ON(1);
347 break;
348 }
349 dst->payload_len = cpu_to_le32(src->payload_len);
350 }
351
352 /*
353 * build new request AND message
354 *
355 */
356 void ceph_osdc_build_request(struct ceph_osd_request *req,
357 u64 off, u64 *plen,
358 struct ceph_osd_req_op *src_ops,
359 struct ceph_snap_context *snapc,
360 struct timespec *mtime,
361 const char *oid,
362 int oid_len)
363 {
364 struct ceph_msg *msg = req->r_request;
365 struct ceph_osd_request_head *head;
366 struct ceph_osd_req_op *src_op;
367 struct ceph_osd_op *op;
368 void *p;
369 int num_op = get_num_ops(src_ops, NULL);
370 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
371 int flags = req->r_flags;
372 u64 data_len = 0;
373 int i;
374
375 head = msg->front.iov_base;
376 op = (void *)(head + 1);
377 p = (void *)(op + num_op);
378
379 req->r_snapc = ceph_get_snap_context(snapc);
380
381 head->client_inc = cpu_to_le32(1); /* always, for now. */
382 head->flags = cpu_to_le32(flags);
383 if (flags & CEPH_OSD_FLAG_WRITE)
384 ceph_encode_timespec(&head->mtime, mtime);
385 head->num_ops = cpu_to_le16(num_op);
386
387
388 /* fill in oid */
389 head->object_len = cpu_to_le32(oid_len);
390 memcpy(p, oid, oid_len);
391 p += oid_len;
392
393 src_op = src_ops;
394 while (src_op->op) {
395 osd_req_encode_op(req, op, src_op);
396 src_op++;
397 op++;
398 }
399
400 if (req->r_trail)
401 data_len += req->r_trail->length;
402
403 if (snapc) {
404 head->snap_seq = cpu_to_le64(snapc->seq);
405 head->num_snaps = cpu_to_le32(snapc->num_snaps);
406 for (i = 0; i < snapc->num_snaps; i++) {
407 put_unaligned_le64(snapc->snaps[i], p);
408 p += sizeof(u64);
409 }
410 }
411
412 if (flags & CEPH_OSD_FLAG_WRITE) {
413 req->r_request->hdr.data_off = cpu_to_le16(off);
414 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
415 } else if (data_len) {
416 req->r_request->hdr.data_off = 0;
417 req->r_request->hdr.data_len = cpu_to_le32(data_len);
418 }
419
420 req->r_request->page_alignment = req->r_page_alignment;
421
422 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
423 msg_size = p - msg->front.iov_base;
424 msg->front.iov_len = msg_size;
425 msg->hdr.front_len = cpu_to_le32(msg_size);
426 return;
427 }
428 EXPORT_SYMBOL(ceph_osdc_build_request);
429
430 /*
431 * build new request AND message, calculate layout, and adjust file
432 * extent as needed.
433 *
434 * if the file was recently truncated, we include information about its
435 * old and new size so that the object can be updated appropriately. (we
436 * avoid synchronously deleting truncated objects because it's slow.)
437 *
438 * if @do_sync, include a 'startsync' command so that the osd will flush
439 * data quickly.
440 */
441 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
442 struct ceph_file_layout *layout,
443 struct ceph_vino vino,
444 u64 off, u64 *plen,
445 int opcode, int flags,
446 struct ceph_snap_context *snapc,
447 int do_sync,
448 u32 truncate_seq,
449 u64 truncate_size,
450 struct timespec *mtime,
451 bool use_mempool, int num_reply,
452 int page_align)
453 {
454 struct ceph_osd_req_op ops[3];
455 struct ceph_osd_request *req;
456
457 ops[0].op = opcode;
458 ops[0].extent.truncate_seq = truncate_seq;
459 ops[0].extent.truncate_size = truncate_size;
460 ops[0].payload_len = 0;
461
462 if (do_sync) {
463 ops[1].op = CEPH_OSD_OP_STARTSYNC;
464 ops[1].payload_len = 0;
465 ops[2].op = 0;
466 } else
467 ops[1].op = 0;
468
469 req = ceph_osdc_alloc_request(osdc, flags,
470 snapc, ops,
471 use_mempool,
472 GFP_NOFS, NULL, NULL);
473 if (!req)
474 return NULL;
475
476 /* calculate max write size */
477 calc_layout(osdc, vino, layout, off, plen, req, ops);
478 req->r_file_layout = *layout; /* keep a copy */
479
480 /* in case it differs from natural (file) alignment that
481 calc_layout filled in for us */
482 req->r_num_pages = calc_pages_for(page_align, *plen);
483 req->r_page_alignment = page_align;
484
485 ceph_osdc_build_request(req, off, plen, ops,
486 snapc,
487 mtime,
488 req->r_oid, req->r_oid_len);
489
490 return req;
491 }
492 EXPORT_SYMBOL(ceph_osdc_new_request);
493
494 /*
495 * We keep osd requests in an rbtree, sorted by ->r_tid.
496 */
497 static void __insert_request(struct ceph_osd_client *osdc,
498 struct ceph_osd_request *new)
499 {
500 struct rb_node **p = &osdc->requests.rb_node;
501 struct rb_node *parent = NULL;
502 struct ceph_osd_request *req = NULL;
503
504 while (*p) {
505 parent = *p;
506 req = rb_entry(parent, struct ceph_osd_request, r_node);
507 if (new->r_tid < req->r_tid)
508 p = &(*p)->rb_left;
509 else if (new->r_tid > req->r_tid)
510 p = &(*p)->rb_right;
511 else
512 BUG();
513 }
514
515 rb_link_node(&new->r_node, parent, p);
516 rb_insert_color(&new->r_node, &osdc->requests);
517 }
518
519 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
520 u64 tid)
521 {
522 struct ceph_osd_request *req;
523 struct rb_node *n = osdc->requests.rb_node;
524
525 while (n) {
526 req = rb_entry(n, struct ceph_osd_request, r_node);
527 if (tid < req->r_tid)
528 n = n->rb_left;
529 else if (tid > req->r_tid)
530 n = n->rb_right;
531 else
532 return req;
533 }
534 return NULL;
535 }
536
537 static struct ceph_osd_request *
538 __lookup_request_ge(struct ceph_osd_client *osdc,
539 u64 tid)
540 {
541 struct ceph_osd_request *req;
542 struct rb_node *n = osdc->requests.rb_node;
543
544 while (n) {
545 req = rb_entry(n, struct ceph_osd_request, r_node);
546 if (tid < req->r_tid) {
547 if (!n->rb_left)
548 return req;
549 n = n->rb_left;
550 } else if (tid > req->r_tid) {
551 n = n->rb_right;
552 } else {
553 return req;
554 }
555 }
556 return NULL;
557 }
558
559 /*
560 * Resubmit requests pending on the given osd.
561 */
562 static void __kick_osd_requests(struct ceph_osd_client *osdc,
563 struct ceph_osd *osd)
564 {
565 struct ceph_osd_request *req, *nreq;
566 int err;
567
568 dout("__kick_osd_requests osd%d\n", osd->o_osd);
569 err = __reset_osd(osdc, osd);
570 if (err == -EAGAIN)
571 return;
572
573 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
574 list_move(&req->r_req_lru_item, &osdc->req_unsent);
575 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
576 osd->o_osd);
577 if (!req->r_linger)
578 req->r_flags |= CEPH_OSD_FLAG_RETRY;
579 }
580
581 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
582 r_linger_osd) {
583 /*
584 * reregister request prior to unregistering linger so
585 * that r_osd is preserved.
586 */
587 BUG_ON(!list_empty(&req->r_req_lru_item));
588 __register_request(osdc, req);
589 list_add(&req->r_req_lru_item, &osdc->req_unsent);
590 list_add(&req->r_osd_item, &req->r_osd->o_requests);
591 __unregister_linger_request(osdc, req);
592 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
593 osd->o_osd);
594 }
595 }
596
597 static void kick_osd_requests(struct ceph_osd_client *osdc,
598 struct ceph_osd *kickosd)
599 {
600 mutex_lock(&osdc->request_mutex);
601 __kick_osd_requests(osdc, kickosd);
602 mutex_unlock(&osdc->request_mutex);
603 }
604
605 /*
606 * If the osd connection drops, we need to resubmit all requests.
607 */
608 static void osd_reset(struct ceph_connection *con)
609 {
610 struct ceph_osd *osd = con->private;
611 struct ceph_osd_client *osdc;
612
613 if (!osd)
614 return;
615 dout("osd_reset osd%d\n", osd->o_osd);
616 osdc = osd->o_osdc;
617 down_read(&osdc->map_sem);
618 kick_osd_requests(osdc, osd);
619 send_queued(osdc);
620 up_read(&osdc->map_sem);
621 }
622
623 /*
624 * Track open sessions with osds.
625 */
626 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
627 {
628 struct ceph_osd *osd;
629
630 osd = kzalloc(sizeof(*osd), GFP_NOFS);
631 if (!osd)
632 return NULL;
633
634 atomic_set(&osd->o_ref, 1);
635 osd->o_osdc = osdc;
636 INIT_LIST_HEAD(&osd->o_requests);
637 INIT_LIST_HEAD(&osd->o_linger_requests);
638 INIT_LIST_HEAD(&osd->o_osd_lru);
639 osd->o_incarnation = 1;
640
641 ceph_con_init(osdc->client->msgr, &osd->o_con);
642 osd->o_con.private = osd;
643 osd->o_con.ops = &osd_con_ops;
644 osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
645
646 INIT_LIST_HEAD(&osd->o_keepalive_item);
647 return osd;
648 }
649
650 static struct ceph_osd *get_osd(struct ceph_osd *osd)
651 {
652 if (atomic_inc_not_zero(&osd->o_ref)) {
653 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
654 atomic_read(&osd->o_ref));
655 return osd;
656 } else {
657 dout("get_osd %p FAIL\n", osd);
658 return NULL;
659 }
660 }
661
662 static void put_osd(struct ceph_osd *osd)
663 {
664 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
665 atomic_read(&osd->o_ref) - 1);
666 if (atomic_dec_and_test(&osd->o_ref)) {
667 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
668
669 if (osd->o_authorizer)
670 ac->ops->destroy_authorizer(ac, osd->o_authorizer);
671 kfree(osd);
672 }
673 }
674
675 /*
676 * remove an osd from our map
677 */
678 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
679 {
680 dout("__remove_osd %p\n", osd);
681 BUG_ON(!list_empty(&osd->o_requests));
682 rb_erase(&osd->o_node, &osdc->osds);
683 list_del_init(&osd->o_osd_lru);
684 ceph_con_close(&osd->o_con);
685 put_osd(osd);
686 }
687
688 static void remove_all_osds(struct ceph_osd_client *osdc)
689 {
690 dout("__remove_old_osds %p\n", osdc);
691 mutex_lock(&osdc->request_mutex);
692 while (!RB_EMPTY_ROOT(&osdc->osds)) {
693 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
694 struct ceph_osd, o_node);
695 __remove_osd(osdc, osd);
696 }
697 mutex_unlock(&osdc->request_mutex);
698 }
699
700 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
701 struct ceph_osd *osd)
702 {
703 dout("__move_osd_to_lru %p\n", osd);
704 BUG_ON(!list_empty(&osd->o_osd_lru));
705 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
706 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
707 }
708
709 static void __remove_osd_from_lru(struct ceph_osd *osd)
710 {
711 dout("__remove_osd_from_lru %p\n", osd);
712 if (!list_empty(&osd->o_osd_lru))
713 list_del_init(&osd->o_osd_lru);
714 }
715
716 static void remove_old_osds(struct ceph_osd_client *osdc)
717 {
718 struct ceph_osd *osd, *nosd;
719
720 dout("__remove_old_osds %p\n", osdc);
721 mutex_lock(&osdc->request_mutex);
722 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
723 if (time_before(jiffies, osd->lru_ttl))
724 break;
725 __remove_osd(osdc, osd);
726 }
727 mutex_unlock(&osdc->request_mutex);
728 }
729
730 /*
731 * reset osd connect
732 */
733 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
734 {
735 struct ceph_osd_request *req;
736 int ret = 0;
737
738 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
739 if (list_empty(&osd->o_requests) &&
740 list_empty(&osd->o_linger_requests)) {
741 __remove_osd(osdc, osd);
742 } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
743 &osd->o_con.peer_addr,
744 sizeof(osd->o_con.peer_addr)) == 0 &&
745 !ceph_con_opened(&osd->o_con)) {
746 dout(" osd addr hasn't changed and connection never opened,"
747 " letting msgr retry");
748 /* touch each r_stamp for handle_timeout()'s benfit */
749 list_for_each_entry(req, &osd->o_requests, r_osd_item)
750 req->r_stamp = jiffies;
751 ret = -EAGAIN;
752 } else {
753 ceph_con_close(&osd->o_con);
754 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
755 osd->o_incarnation++;
756 }
757 return ret;
758 }
759
760 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
761 {
762 struct rb_node **p = &osdc->osds.rb_node;
763 struct rb_node *parent = NULL;
764 struct ceph_osd *osd = NULL;
765
766 dout("__insert_osd %p osd%d\n", new, new->o_osd);
767 while (*p) {
768 parent = *p;
769 osd = rb_entry(parent, struct ceph_osd, o_node);
770 if (new->o_osd < osd->o_osd)
771 p = &(*p)->rb_left;
772 else if (new->o_osd > osd->o_osd)
773 p = &(*p)->rb_right;
774 else
775 BUG();
776 }
777
778 rb_link_node(&new->o_node, parent, p);
779 rb_insert_color(&new->o_node, &osdc->osds);
780 }
781
782 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
783 {
784 struct ceph_osd *osd;
785 struct rb_node *n = osdc->osds.rb_node;
786
787 while (n) {
788 osd = rb_entry(n, struct ceph_osd, o_node);
789 if (o < osd->o_osd)
790 n = n->rb_left;
791 else if (o > osd->o_osd)
792 n = n->rb_right;
793 else
794 return osd;
795 }
796 return NULL;
797 }
798
799 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
800 {
801 schedule_delayed_work(&osdc->timeout_work,
802 osdc->client->options->osd_keepalive_timeout * HZ);
803 }
804
805 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
806 {
807 cancel_delayed_work(&osdc->timeout_work);
808 }
809
810 /*
811 * Register request, assign tid. If this is the first request, set up
812 * the timeout event.
813 */
814 static void __register_request(struct ceph_osd_client *osdc,
815 struct ceph_osd_request *req)
816 {
817 req->r_tid = ++osdc->last_tid;
818 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
819 INIT_LIST_HEAD(&req->r_req_lru_item);
820
821 dout("__register_request %p tid %lld\n", req, req->r_tid);
822 __insert_request(osdc, req);
823 ceph_osdc_get_request(req);
824 osdc->num_requests++;
825
826 if (osdc->num_requests == 1) {
827 dout(" first request, scheduling timeout\n");
828 __schedule_osd_timeout(osdc);
829 }
830 }
831
832 static void register_request(struct ceph_osd_client *osdc,
833 struct ceph_osd_request *req)
834 {
835 mutex_lock(&osdc->request_mutex);
836 __register_request(osdc, req);
837 mutex_unlock(&osdc->request_mutex);
838 }
839
840 /*
841 * called under osdc->request_mutex
842 */
843 static void __unregister_request(struct ceph_osd_client *osdc,
844 struct ceph_osd_request *req)
845 {
846 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
847 rb_erase(&req->r_node, &osdc->requests);
848 osdc->num_requests--;
849
850 if (req->r_osd) {
851 /* make sure the original request isn't in flight. */
852 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
853
854 list_del_init(&req->r_osd_item);
855 if (list_empty(&req->r_osd->o_requests) &&
856 list_empty(&req->r_osd->o_linger_requests)) {
857 dout("moving osd to %p lru\n", req->r_osd);
858 __move_osd_to_lru(osdc, req->r_osd);
859 }
860 if (list_empty(&req->r_linger_item))
861 req->r_osd = NULL;
862 }
863
864 ceph_osdc_put_request(req);
865
866 list_del_init(&req->r_req_lru_item);
867 if (osdc->num_requests == 0) {
868 dout(" no requests, canceling timeout\n");
869 __cancel_osd_timeout(osdc);
870 }
871 }
872
873 /*
874 * Cancel a previously queued request message
875 */
876 static void __cancel_request(struct ceph_osd_request *req)
877 {
878 if (req->r_sent && req->r_osd) {
879 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
880 req->r_sent = 0;
881 }
882 }
883
884 static void __register_linger_request(struct ceph_osd_client *osdc,
885 struct ceph_osd_request *req)
886 {
887 dout("__register_linger_request %p\n", req);
888 list_add_tail(&req->r_linger_item, &osdc->req_linger);
889 list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
890 }
891
892 static void __unregister_linger_request(struct ceph_osd_client *osdc,
893 struct ceph_osd_request *req)
894 {
895 dout("__unregister_linger_request %p\n", req);
896 if (req->r_osd) {
897 list_del_init(&req->r_linger_item);
898 list_del_init(&req->r_linger_osd);
899
900 if (list_empty(&req->r_osd->o_requests) &&
901 list_empty(&req->r_osd->o_linger_requests)) {
902 dout("moving osd to %p lru\n", req->r_osd);
903 __move_osd_to_lru(osdc, req->r_osd);
904 }
905 if (list_empty(&req->r_osd_item))
906 req->r_osd = NULL;
907 }
908 }
909
910 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
911 struct ceph_osd_request *req)
912 {
913 mutex_lock(&osdc->request_mutex);
914 if (req->r_linger) {
915 __unregister_linger_request(osdc, req);
916 ceph_osdc_put_request(req);
917 }
918 mutex_unlock(&osdc->request_mutex);
919 }
920 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
921
922 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
923 struct ceph_osd_request *req)
924 {
925 if (!req->r_linger) {
926 dout("set_request_linger %p\n", req);
927 req->r_linger = 1;
928 /*
929 * caller is now responsible for calling
930 * unregister_linger_request
931 */
932 ceph_osdc_get_request(req);
933 }
934 }
935 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
936
937 /*
938 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
939 * (as needed), and set the request r_osd appropriately. If there is
940 * no up osd, set r_osd to NULL. Move the request to the appropriate list
941 * (unsent, homeless) or leave on in-flight lru.
942 *
943 * Return 0 if unchanged, 1 if changed, or negative on error.
944 *
945 * Caller should hold map_sem for read and request_mutex.
946 */
947 static int __map_request(struct ceph_osd_client *osdc,
948 struct ceph_osd_request *req)
949 {
950 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
951 struct ceph_pg pgid;
952 int acting[CEPH_PG_MAX_SIZE];
953 int o = -1, num = 0;
954 int err;
955
956 dout("map_request %p tid %lld\n", req, req->r_tid);
957 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
958 &req->r_file_layout, osdc->osdmap);
959 if (err) {
960 list_move(&req->r_req_lru_item, &osdc->req_notarget);
961 return err;
962 }
963 pgid = reqhead->layout.ol_pgid;
964 req->r_pgid = pgid;
965
966 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
967 if (err > 0) {
968 o = acting[0];
969 num = err;
970 }
971
972 if ((req->r_osd && req->r_osd->o_osd == o &&
973 req->r_sent >= req->r_osd->o_incarnation &&
974 req->r_num_pg_osds == num &&
975 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
976 (req->r_osd == NULL && o == -1))
977 return 0; /* no change */
978
979 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
980 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
981 req->r_osd ? req->r_osd->o_osd : -1);
982
983 /* record full pg acting set */
984 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
985 req->r_num_pg_osds = num;
986
987 if (req->r_osd) {
988 __cancel_request(req);
989 list_del_init(&req->r_osd_item);
990 req->r_osd = NULL;
991 }
992
993 req->r_osd = __lookup_osd(osdc, o);
994 if (!req->r_osd && o >= 0) {
995 err = -ENOMEM;
996 req->r_osd = create_osd(osdc);
997 if (!req->r_osd) {
998 list_move(&req->r_req_lru_item, &osdc->req_notarget);
999 goto out;
1000 }
1001
1002 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1003 req->r_osd->o_osd = o;
1004 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
1005 __insert_osd(osdc, req->r_osd);
1006
1007 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
1008 }
1009
1010 if (req->r_osd) {
1011 __remove_osd_from_lru(req->r_osd);
1012 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1013 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1014 } else {
1015 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1016 }
1017 err = 1; /* osd or pg changed */
1018
1019 out:
1020 return err;
1021 }
1022
1023 /*
1024 * caller should hold map_sem (for read) and request_mutex
1025 */
1026 static int __send_request(struct ceph_osd_client *osdc,
1027 struct ceph_osd_request *req)
1028 {
1029 struct ceph_osd_request_head *reqhead;
1030
1031 dout("send_request %p tid %llu to osd%d flags %d\n",
1032 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1033
1034 reqhead = req->r_request->front.iov_base;
1035 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1036 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1037 reqhead->reassert_version = req->r_reassert_version;
1038
1039 req->r_stamp = jiffies;
1040 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1041
1042 ceph_msg_get(req->r_request); /* send consumes a ref */
1043 ceph_con_send(&req->r_osd->o_con, req->r_request);
1044 req->r_sent = req->r_osd->o_incarnation;
1045 return 0;
1046 }
1047
1048 /*
1049 * Send any requests in the queue (req_unsent).
1050 */
1051 static void send_queued(struct ceph_osd_client *osdc)
1052 {
1053 struct ceph_osd_request *req, *tmp;
1054
1055 dout("send_queued\n");
1056 mutex_lock(&osdc->request_mutex);
1057 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1058 __send_request(osdc, req);
1059 }
1060 mutex_unlock(&osdc->request_mutex);
1061 }
1062
1063 /*
1064 * Timeout callback, called every N seconds when 1 or more osd
1065 * requests has been active for more than N seconds. When this
1066 * happens, we ping all OSDs with requests who have timed out to
1067 * ensure any communications channel reset is detected. Reset the
1068 * request timeouts another N seconds in the future as we go.
1069 * Reschedule the timeout event another N seconds in future (unless
1070 * there are no open requests).
1071 */
1072 static void handle_timeout(struct work_struct *work)
1073 {
1074 struct ceph_osd_client *osdc =
1075 container_of(work, struct ceph_osd_client, timeout_work.work);
1076 struct ceph_osd_request *req, *last_req = NULL;
1077 struct ceph_osd *osd;
1078 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1079 unsigned long keepalive =
1080 osdc->client->options->osd_keepalive_timeout * HZ;
1081 unsigned long last_stamp = 0;
1082 struct list_head slow_osds;
1083 dout("timeout\n");
1084 down_read(&osdc->map_sem);
1085
1086 ceph_monc_request_next_osdmap(&osdc->client->monc);
1087
1088 mutex_lock(&osdc->request_mutex);
1089
1090 /*
1091 * reset osds that appear to be _really_ unresponsive. this
1092 * is a failsafe measure.. we really shouldn't be getting to
1093 * this point if the system is working properly. the monitors
1094 * should mark the osd as failed and we should find out about
1095 * it from an updated osd map.
1096 */
1097 while (timeout && !list_empty(&osdc->req_lru)) {
1098 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1099 r_req_lru_item);
1100
1101 /* hasn't been long enough since we sent it? */
1102 if (time_before(jiffies, req->r_stamp + timeout))
1103 break;
1104
1105 /* hasn't been long enough since it was acked? */
1106 if (req->r_request->ack_stamp == 0 ||
1107 time_before(jiffies, req->r_request->ack_stamp + timeout))
1108 break;
1109
1110 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1111 last_req = req;
1112 last_stamp = req->r_stamp;
1113
1114 osd = req->r_osd;
1115 BUG_ON(!osd);
1116 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1117 req->r_tid, osd->o_osd);
1118 __kick_osd_requests(osdc, osd);
1119 }
1120
1121 /*
1122 * ping osds that are a bit slow. this ensures that if there
1123 * is a break in the TCP connection we will notice, and reopen
1124 * a connection with that osd (from the fault callback).
1125 */
1126 INIT_LIST_HEAD(&slow_osds);
1127 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1128 if (time_before(jiffies, req->r_stamp + keepalive))
1129 break;
1130
1131 osd = req->r_osd;
1132 BUG_ON(!osd);
1133 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1134 req->r_tid, osd->o_osd);
1135 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1136 }
1137 while (!list_empty(&slow_osds)) {
1138 osd = list_entry(slow_osds.next, struct ceph_osd,
1139 o_keepalive_item);
1140 list_del_init(&osd->o_keepalive_item);
1141 ceph_con_keepalive(&osd->o_con);
1142 }
1143
1144 __schedule_osd_timeout(osdc);
1145 mutex_unlock(&osdc->request_mutex);
1146 send_queued(osdc);
1147 up_read(&osdc->map_sem);
1148 }
1149
1150 static void handle_osds_timeout(struct work_struct *work)
1151 {
1152 struct ceph_osd_client *osdc =
1153 container_of(work, struct ceph_osd_client,
1154 osds_timeout_work.work);
1155 unsigned long delay =
1156 osdc->client->options->osd_idle_ttl * HZ >> 2;
1157
1158 dout("osds timeout\n");
1159 down_read(&osdc->map_sem);
1160 remove_old_osds(osdc);
1161 up_read(&osdc->map_sem);
1162
1163 schedule_delayed_work(&osdc->osds_timeout_work,
1164 round_jiffies_relative(delay));
1165 }
1166
1167 static void complete_request(struct ceph_osd_request *req)
1168 {
1169 if (req->r_safe_callback)
1170 req->r_safe_callback(req, NULL);
1171 complete_all(&req->r_safe_completion); /* fsync waiter */
1172 }
1173
1174 /*
1175 * handle osd op reply. either call the callback if it is specified,
1176 * or do the completion to wake up the waiting thread.
1177 */
1178 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1179 struct ceph_connection *con)
1180 {
1181 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1182 struct ceph_osd_request *req;
1183 u64 tid;
1184 int numops, object_len, flags;
1185 s32 result;
1186
1187 tid = le64_to_cpu(msg->hdr.tid);
1188 if (msg->front.iov_len < sizeof(*rhead))
1189 goto bad;
1190 numops = le32_to_cpu(rhead->num_ops);
1191 object_len = le32_to_cpu(rhead->object_len);
1192 result = le32_to_cpu(rhead->result);
1193 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1194 numops * sizeof(struct ceph_osd_op))
1195 goto bad;
1196 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1197 /* lookup */
1198 mutex_lock(&osdc->request_mutex);
1199 req = __lookup_request(osdc, tid);
1200 if (req == NULL) {
1201 dout("handle_reply tid %llu dne\n", tid);
1202 mutex_unlock(&osdc->request_mutex);
1203 return;
1204 }
1205 ceph_osdc_get_request(req);
1206 flags = le32_to_cpu(rhead->flags);
1207
1208 /*
1209 * if this connection filled our message, drop our reference now, to
1210 * avoid a (safe but slower) revoke later.
1211 */
1212 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1213 dout(" dropping con_filling_msg ref %p\n", con);
1214 req->r_con_filling_msg = NULL;
1215 ceph_con_put(con);
1216 }
1217
1218 if (!req->r_got_reply) {
1219 unsigned bytes;
1220
1221 req->r_result = le32_to_cpu(rhead->result);
1222 bytes = le32_to_cpu(msg->hdr.data_len);
1223 dout("handle_reply result %d bytes %d\n", req->r_result,
1224 bytes);
1225 if (req->r_result == 0)
1226 req->r_result = bytes;
1227
1228 /* in case this is a write and we need to replay, */
1229 req->r_reassert_version = rhead->reassert_version;
1230
1231 req->r_got_reply = 1;
1232 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1233 dout("handle_reply tid %llu dup ack\n", tid);
1234 mutex_unlock(&osdc->request_mutex);
1235 goto done;
1236 }
1237
1238 dout("handle_reply tid %llu flags %d\n", tid, flags);
1239
1240 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1241 __register_linger_request(osdc, req);
1242
1243 /* either this is a read, or we got the safe response */
1244 if (result < 0 ||
1245 (flags & CEPH_OSD_FLAG_ONDISK) ||
1246 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1247 __unregister_request(osdc, req);
1248
1249 mutex_unlock(&osdc->request_mutex);
1250
1251 if (req->r_callback)
1252 req->r_callback(req, msg);
1253 else
1254 complete_all(&req->r_completion);
1255
1256 if (flags & CEPH_OSD_FLAG_ONDISK)
1257 complete_request(req);
1258
1259 done:
1260 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1261 ceph_osdc_put_request(req);
1262 return;
1263
1264 bad:
1265 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1266 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1267 (int)sizeof(*rhead));
1268 ceph_msg_dump(msg);
1269 }
1270
1271 static void reset_changed_osds(struct ceph_osd_client *osdc)
1272 {
1273 struct rb_node *p, *n;
1274
1275 for (p = rb_first(&osdc->osds); p; p = n) {
1276 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1277
1278 n = rb_next(p);
1279 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1280 memcmp(&osd->o_con.peer_addr,
1281 ceph_osd_addr(osdc->osdmap,
1282 osd->o_osd),
1283 sizeof(struct ceph_entity_addr)) != 0)
1284 __reset_osd(osdc, osd);
1285 }
1286 }
1287
1288 /*
1289 * Requeue requests whose mapping to an OSD has changed. If requests map to
1290 * no osd, request a new map.
1291 *
1292 * Caller should hold map_sem for read and request_mutex.
1293 */
1294 static void kick_requests(struct ceph_osd_client *osdc)
1295 {
1296 struct ceph_osd_request *req, *nreq;
1297 struct rb_node *p;
1298 int needmap = 0;
1299 int err;
1300
1301 dout("kick_requests\n");
1302 mutex_lock(&osdc->request_mutex);
1303 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1304 req = rb_entry(p, struct ceph_osd_request, r_node);
1305 err = __map_request(osdc, req);
1306 if (err < 0)
1307 continue; /* error */
1308 if (req->r_osd == NULL) {
1309 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1310 needmap++; /* request a newer map */
1311 } else if (err > 0) {
1312 dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1313 req->r_osd ? req->r_osd->o_osd : -1);
1314 if (!req->r_linger)
1315 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1316 }
1317 }
1318
1319 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1320 r_linger_item) {
1321 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1322
1323 err = __map_request(osdc, req);
1324 if (err == 0)
1325 continue; /* no change and no osd was specified */
1326 if (err < 0)
1327 continue; /* hrm! */
1328 if (req->r_osd == NULL) {
1329 dout("tid %llu maps to no valid osd\n", req->r_tid);
1330 needmap++; /* request a newer map */
1331 continue;
1332 }
1333
1334 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1335 req->r_osd ? req->r_osd->o_osd : -1);
1336 __unregister_linger_request(osdc, req);
1337 __register_request(osdc, req);
1338 }
1339 mutex_unlock(&osdc->request_mutex);
1340
1341 if (needmap) {
1342 dout("%d requests for down osds, need new map\n", needmap);
1343 ceph_monc_request_next_osdmap(&osdc->client->monc);
1344 }
1345 }
1346
1347
1348 /*
1349 * Process updated osd map.
1350 *
1351 * The message contains any number of incremental and full maps, normally
1352 * indicating some sort of topology change in the cluster. Kick requests
1353 * off to different OSDs as needed.
1354 */
1355 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1356 {
1357 void *p, *end, *next;
1358 u32 nr_maps, maplen;
1359 u32 epoch;
1360 struct ceph_osdmap *newmap = NULL, *oldmap;
1361 int err;
1362 struct ceph_fsid fsid;
1363
1364 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1365 p = msg->front.iov_base;
1366 end = p + msg->front.iov_len;
1367
1368 /* verify fsid */
1369 ceph_decode_need(&p, end, sizeof(fsid), bad);
1370 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1371 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1372 return;
1373
1374 down_write(&osdc->map_sem);
1375
1376 /* incremental maps */
1377 ceph_decode_32_safe(&p, end, nr_maps, bad);
1378 dout(" %d inc maps\n", nr_maps);
1379 while (nr_maps > 0) {
1380 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1381 epoch = ceph_decode_32(&p);
1382 maplen = ceph_decode_32(&p);
1383 ceph_decode_need(&p, end, maplen, bad);
1384 next = p + maplen;
1385 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1386 dout("applying incremental map %u len %d\n",
1387 epoch, maplen);
1388 newmap = osdmap_apply_incremental(&p, next,
1389 osdc->osdmap,
1390 osdc->client->msgr);
1391 if (IS_ERR(newmap)) {
1392 err = PTR_ERR(newmap);
1393 goto bad;
1394 }
1395 BUG_ON(!newmap);
1396 if (newmap != osdc->osdmap) {
1397 ceph_osdmap_destroy(osdc->osdmap);
1398 osdc->osdmap = newmap;
1399 }
1400 kick_requests(osdc);
1401 reset_changed_osds(osdc);
1402 } else {
1403 dout("ignoring incremental map %u len %d\n",
1404 epoch, maplen);
1405 }
1406 p = next;
1407 nr_maps--;
1408 }
1409 if (newmap)
1410 goto done;
1411
1412 /* full maps */
1413 ceph_decode_32_safe(&p, end, nr_maps, bad);
1414 dout(" %d full maps\n", nr_maps);
1415 while (nr_maps) {
1416 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1417 epoch = ceph_decode_32(&p);
1418 maplen = ceph_decode_32(&p);
1419 ceph_decode_need(&p, end, maplen, bad);
1420 if (nr_maps > 1) {
1421 dout("skipping non-latest full map %u len %d\n",
1422 epoch, maplen);
1423 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1424 dout("skipping full map %u len %d, "
1425 "older than our %u\n", epoch, maplen,
1426 osdc->osdmap->epoch);
1427 } else {
1428 dout("taking full map %u len %d\n", epoch, maplen);
1429 newmap = osdmap_decode(&p, p+maplen);
1430 if (IS_ERR(newmap)) {
1431 err = PTR_ERR(newmap);
1432 goto bad;
1433 }
1434 BUG_ON(!newmap);
1435 oldmap = osdc->osdmap;
1436 osdc->osdmap = newmap;
1437 if (oldmap)
1438 ceph_osdmap_destroy(oldmap);
1439 kick_requests(osdc);
1440 }
1441 p += maplen;
1442 nr_maps--;
1443 }
1444
1445 done:
1446 downgrade_write(&osdc->map_sem);
1447 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1448
1449 /*
1450 * subscribe to subsequent osdmap updates if full to ensure
1451 * we find out when we are no longer full and stop returning
1452 * ENOSPC.
1453 */
1454 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1455 ceph_monc_request_next_osdmap(&osdc->client->monc);
1456
1457 send_queued(osdc);
1458 up_read(&osdc->map_sem);
1459 wake_up_all(&osdc->client->auth_wq);
1460 return;
1461
1462 bad:
1463 pr_err("osdc handle_map corrupt msg\n");
1464 ceph_msg_dump(msg);
1465 up_write(&osdc->map_sem);
1466 return;
1467 }
1468
1469 /*
1470 * watch/notify callback event infrastructure
1471 *
1472 * These callbacks are used both for watch and notify operations.
1473 */
1474 static void __release_event(struct kref *kref)
1475 {
1476 struct ceph_osd_event *event =
1477 container_of(kref, struct ceph_osd_event, kref);
1478
1479 dout("__release_event %p\n", event);
1480 kfree(event);
1481 }
1482
1483 static void get_event(struct ceph_osd_event *event)
1484 {
1485 kref_get(&event->kref);
1486 }
1487
1488 void ceph_osdc_put_event(struct ceph_osd_event *event)
1489 {
1490 kref_put(&event->kref, __release_event);
1491 }
1492 EXPORT_SYMBOL(ceph_osdc_put_event);
1493
1494 static void __insert_event(struct ceph_osd_client *osdc,
1495 struct ceph_osd_event *new)
1496 {
1497 struct rb_node **p = &osdc->event_tree.rb_node;
1498 struct rb_node *parent = NULL;
1499 struct ceph_osd_event *event = NULL;
1500
1501 while (*p) {
1502 parent = *p;
1503 event = rb_entry(parent, struct ceph_osd_event, node);
1504 if (new->cookie < event->cookie)
1505 p = &(*p)->rb_left;
1506 else if (new->cookie > event->cookie)
1507 p = &(*p)->rb_right;
1508 else
1509 BUG();
1510 }
1511
1512 rb_link_node(&new->node, parent, p);
1513 rb_insert_color(&new->node, &osdc->event_tree);
1514 }
1515
1516 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1517 u64 cookie)
1518 {
1519 struct rb_node **p = &osdc->event_tree.rb_node;
1520 struct rb_node *parent = NULL;
1521 struct ceph_osd_event *event = NULL;
1522
1523 while (*p) {
1524 parent = *p;
1525 event = rb_entry(parent, struct ceph_osd_event, node);
1526 if (cookie < event->cookie)
1527 p = &(*p)->rb_left;
1528 else if (cookie > event->cookie)
1529 p = &(*p)->rb_right;
1530 else
1531 return event;
1532 }
1533 return NULL;
1534 }
1535
1536 static void __remove_event(struct ceph_osd_event *event)
1537 {
1538 struct ceph_osd_client *osdc = event->osdc;
1539
1540 if (!RB_EMPTY_NODE(&event->node)) {
1541 dout("__remove_event removed %p\n", event);
1542 rb_erase(&event->node, &osdc->event_tree);
1543 ceph_osdc_put_event(event);
1544 } else {
1545 dout("__remove_event didn't remove %p\n", event);
1546 }
1547 }
1548
1549 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1550 void (*event_cb)(u64, u64, u8, void *),
1551 int one_shot, void *data,
1552 struct ceph_osd_event **pevent)
1553 {
1554 struct ceph_osd_event *event;
1555
1556 event = kmalloc(sizeof(*event), GFP_NOIO);
1557 if (!event)
1558 return -ENOMEM;
1559
1560 dout("create_event %p\n", event);
1561 event->cb = event_cb;
1562 event->one_shot = one_shot;
1563 event->data = data;
1564 event->osdc = osdc;
1565 INIT_LIST_HEAD(&event->osd_node);
1566 kref_init(&event->kref); /* one ref for us */
1567 kref_get(&event->kref); /* one ref for the caller */
1568 init_completion(&event->completion);
1569
1570 spin_lock(&osdc->event_lock);
1571 event->cookie = ++osdc->event_count;
1572 __insert_event(osdc, event);
1573 spin_unlock(&osdc->event_lock);
1574
1575 *pevent = event;
1576 return 0;
1577 }
1578 EXPORT_SYMBOL(ceph_osdc_create_event);
1579
1580 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1581 {
1582 struct ceph_osd_client *osdc = event->osdc;
1583
1584 dout("cancel_event %p\n", event);
1585 spin_lock(&osdc->event_lock);
1586 __remove_event(event);
1587 spin_unlock(&osdc->event_lock);
1588 ceph_osdc_put_event(event); /* caller's */
1589 }
1590 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1591
1592
1593 static void do_event_work(struct work_struct *work)
1594 {
1595 struct ceph_osd_event_work *event_work =
1596 container_of(work, struct ceph_osd_event_work, work);
1597 struct ceph_osd_event *event = event_work->event;
1598 u64 ver = event_work->ver;
1599 u64 notify_id = event_work->notify_id;
1600 u8 opcode = event_work->opcode;
1601
1602 dout("do_event_work completing %p\n", event);
1603 event->cb(ver, notify_id, opcode, event->data);
1604 complete(&event->completion);
1605 dout("do_event_work completed %p\n", event);
1606 ceph_osdc_put_event(event);
1607 kfree(event_work);
1608 }
1609
1610
1611 /*
1612 * Process osd watch notifications
1613 */
1614 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1615 {
1616 void *p, *end;
1617 u8 proto_ver;
1618 u64 cookie, ver, notify_id;
1619 u8 opcode;
1620 struct ceph_osd_event *event;
1621 struct ceph_osd_event_work *event_work;
1622
1623 p = msg->front.iov_base;
1624 end = p + msg->front.iov_len;
1625
1626 ceph_decode_8_safe(&p, end, proto_ver, bad);
1627 ceph_decode_8_safe(&p, end, opcode, bad);
1628 ceph_decode_64_safe(&p, end, cookie, bad);
1629 ceph_decode_64_safe(&p, end, ver, bad);
1630 ceph_decode_64_safe(&p, end, notify_id, bad);
1631
1632 spin_lock(&osdc->event_lock);
1633 event = __find_event(osdc, cookie);
1634 if (event) {
1635 get_event(event);
1636 if (event->one_shot)
1637 __remove_event(event);
1638 }
1639 spin_unlock(&osdc->event_lock);
1640 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1641 cookie, ver, event);
1642 if (event) {
1643 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1644 if (!event_work) {
1645 dout("ERROR: could not allocate event_work\n");
1646 goto done_err;
1647 }
1648 INIT_WORK(&event_work->work, do_event_work);
1649 event_work->event = event;
1650 event_work->ver = ver;
1651 event_work->notify_id = notify_id;
1652 event_work->opcode = opcode;
1653 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1654 dout("WARNING: failed to queue notify event work\n");
1655 goto done_err;
1656 }
1657 }
1658
1659 return;
1660
1661 done_err:
1662 complete(&event->completion);
1663 ceph_osdc_put_event(event);
1664 return;
1665
1666 bad:
1667 pr_err("osdc handle_watch_notify corrupt msg\n");
1668 return;
1669 }
1670
1671 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1672 {
1673 int err;
1674
1675 dout("wait_event %p\n", event);
1676 err = wait_for_completion_interruptible_timeout(&event->completion,
1677 timeout * HZ);
1678 ceph_osdc_put_event(event);
1679 if (err > 0)
1680 err = 0;
1681 dout("wait_event %p returns %d\n", event, err);
1682 return err;
1683 }
1684 EXPORT_SYMBOL(ceph_osdc_wait_event);
1685
1686 /*
1687 * Register request, send initial attempt.
1688 */
1689 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1690 struct ceph_osd_request *req,
1691 bool nofail)
1692 {
1693 int rc = 0;
1694
1695 req->r_request->pages = req->r_pages;
1696 req->r_request->nr_pages = req->r_num_pages;
1697 #ifdef CONFIG_BLOCK
1698 req->r_request->bio = req->r_bio;
1699 #endif
1700 req->r_request->trail = req->r_trail;
1701
1702 register_request(osdc, req);
1703
1704 down_read(&osdc->map_sem);
1705 mutex_lock(&osdc->request_mutex);
1706 /*
1707 * a racing kick_requests() may have sent the message for us
1708 * while we dropped request_mutex above, so only send now if
1709 * the request still han't been touched yet.
1710 */
1711 if (req->r_sent == 0) {
1712 rc = __map_request(osdc, req);
1713 if (rc < 0) {
1714 if (nofail) {
1715 dout("osdc_start_request failed map, "
1716 " will retry %lld\n", req->r_tid);
1717 rc = 0;
1718 }
1719 goto out_unlock;
1720 }
1721 if (req->r_osd == NULL) {
1722 dout("send_request %p no up osds in pg\n", req);
1723 ceph_monc_request_next_osdmap(&osdc->client->monc);
1724 } else {
1725 rc = __send_request(osdc, req);
1726 if (rc) {
1727 if (nofail) {
1728 dout("osdc_start_request failed send, "
1729 " will retry %lld\n", req->r_tid);
1730 rc = 0;
1731 } else {
1732 __unregister_request(osdc, req);
1733 }
1734 }
1735 }
1736 }
1737
1738 out_unlock:
1739 mutex_unlock(&osdc->request_mutex);
1740 up_read(&osdc->map_sem);
1741 return rc;
1742 }
1743 EXPORT_SYMBOL(ceph_osdc_start_request);
1744
1745 /*
1746 * wait for a request to complete
1747 */
1748 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1749 struct ceph_osd_request *req)
1750 {
1751 int rc;
1752
1753 rc = wait_for_completion_interruptible(&req->r_completion);
1754 if (rc < 0) {
1755 mutex_lock(&osdc->request_mutex);
1756 __cancel_request(req);
1757 __unregister_request(osdc, req);
1758 mutex_unlock(&osdc->request_mutex);
1759 complete_request(req);
1760 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1761 return rc;
1762 }
1763
1764 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1765 return req->r_result;
1766 }
1767 EXPORT_SYMBOL(ceph_osdc_wait_request);
1768
1769 /*
1770 * sync - wait for all in-flight requests to flush. avoid starvation.
1771 */
1772 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1773 {
1774 struct ceph_osd_request *req;
1775 u64 last_tid, next_tid = 0;
1776
1777 mutex_lock(&osdc->request_mutex);
1778 last_tid = osdc->last_tid;
1779 while (1) {
1780 req = __lookup_request_ge(osdc, next_tid);
1781 if (!req)
1782 break;
1783 if (req->r_tid > last_tid)
1784 break;
1785
1786 next_tid = req->r_tid + 1;
1787 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1788 continue;
1789
1790 ceph_osdc_get_request(req);
1791 mutex_unlock(&osdc->request_mutex);
1792 dout("sync waiting on tid %llu (last is %llu)\n",
1793 req->r_tid, last_tid);
1794 wait_for_completion(&req->r_safe_completion);
1795 mutex_lock(&osdc->request_mutex);
1796 ceph_osdc_put_request(req);
1797 }
1798 mutex_unlock(&osdc->request_mutex);
1799 dout("sync done (thru tid %llu)\n", last_tid);
1800 }
1801 EXPORT_SYMBOL(ceph_osdc_sync);
1802
1803 /*
1804 * init, shutdown
1805 */
1806 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1807 {
1808 int err;
1809
1810 dout("init\n");
1811 osdc->client = client;
1812 osdc->osdmap = NULL;
1813 init_rwsem(&osdc->map_sem);
1814 init_completion(&osdc->map_waiters);
1815 osdc->last_requested_map = 0;
1816 mutex_init(&osdc->request_mutex);
1817 osdc->last_tid = 0;
1818 osdc->osds = RB_ROOT;
1819 INIT_LIST_HEAD(&osdc->osd_lru);
1820 osdc->requests = RB_ROOT;
1821 INIT_LIST_HEAD(&osdc->req_lru);
1822 INIT_LIST_HEAD(&osdc->req_unsent);
1823 INIT_LIST_HEAD(&osdc->req_notarget);
1824 INIT_LIST_HEAD(&osdc->req_linger);
1825 osdc->num_requests = 0;
1826 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1827 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1828 spin_lock_init(&osdc->event_lock);
1829 osdc->event_tree = RB_ROOT;
1830 osdc->event_count = 0;
1831
1832 schedule_delayed_work(&osdc->osds_timeout_work,
1833 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1834
1835 err = -ENOMEM;
1836 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1837 sizeof(struct ceph_osd_request));
1838 if (!osdc->req_mempool)
1839 goto out;
1840
1841 err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1842 "osd_op");
1843 if (err < 0)
1844 goto out_mempool;
1845 err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1846 OSD_OPREPLY_FRONT_LEN, 10, true,
1847 "osd_op_reply");
1848 if (err < 0)
1849 goto out_msgpool;
1850
1851 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1852 if (IS_ERR(osdc->notify_wq)) {
1853 err = PTR_ERR(osdc->notify_wq);
1854 osdc->notify_wq = NULL;
1855 goto out_msgpool;
1856 }
1857 return 0;
1858
1859 out_msgpool:
1860 ceph_msgpool_destroy(&osdc->msgpool_op);
1861 out_mempool:
1862 mempool_destroy(osdc->req_mempool);
1863 out:
1864 return err;
1865 }
1866 EXPORT_SYMBOL(ceph_osdc_init);
1867
1868 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1869 {
1870 flush_workqueue(osdc->notify_wq);
1871 destroy_workqueue(osdc->notify_wq);
1872 cancel_delayed_work_sync(&osdc->timeout_work);
1873 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1874 if (osdc->osdmap) {
1875 ceph_osdmap_destroy(osdc->osdmap);
1876 osdc->osdmap = NULL;
1877 }
1878 remove_all_osds(osdc);
1879 mempool_destroy(osdc->req_mempool);
1880 ceph_msgpool_destroy(&osdc->msgpool_op);
1881 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1882 }
1883 EXPORT_SYMBOL(ceph_osdc_stop);
1884
1885 /*
1886 * Read some contiguous pages. If we cross a stripe boundary, shorten
1887 * *plen. Return number of bytes read, or error.
1888 */
1889 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1890 struct ceph_vino vino, struct ceph_file_layout *layout,
1891 u64 off, u64 *plen,
1892 u32 truncate_seq, u64 truncate_size,
1893 struct page **pages, int num_pages, int page_align)
1894 {
1895 struct ceph_osd_request *req;
1896 int rc = 0;
1897
1898 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1899 vino.snap, off, *plen);
1900 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1901 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1902 NULL, 0, truncate_seq, truncate_size, NULL,
1903 false, 1, page_align);
1904 if (!req)
1905 return -ENOMEM;
1906
1907 /* it may be a short read due to an object boundary */
1908 req->r_pages = pages;
1909
1910 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1911 off, *plen, req->r_num_pages, page_align);
1912
1913 rc = ceph_osdc_start_request(osdc, req, false);
1914 if (!rc)
1915 rc = ceph_osdc_wait_request(osdc, req);
1916
1917 ceph_osdc_put_request(req);
1918 dout("readpages result %d\n", rc);
1919 return rc;
1920 }
1921 EXPORT_SYMBOL(ceph_osdc_readpages);
1922
1923 /*
1924 * do a synchronous write on N pages
1925 */
1926 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1927 struct ceph_file_layout *layout,
1928 struct ceph_snap_context *snapc,
1929 u64 off, u64 len,
1930 u32 truncate_seq, u64 truncate_size,
1931 struct timespec *mtime,
1932 struct page **pages, int num_pages,
1933 int flags, int do_sync, bool nofail)
1934 {
1935 struct ceph_osd_request *req;
1936 int rc = 0;
1937 int page_align = off & ~PAGE_MASK;
1938
1939 BUG_ON(vino.snap != CEPH_NOSNAP);
1940 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1941 CEPH_OSD_OP_WRITE,
1942 flags | CEPH_OSD_FLAG_ONDISK |
1943 CEPH_OSD_FLAG_WRITE,
1944 snapc, do_sync,
1945 truncate_seq, truncate_size, mtime,
1946 nofail, 1, page_align);
1947 if (!req)
1948 return -ENOMEM;
1949
1950 /* it may be a short write due to an object boundary */
1951 req->r_pages = pages;
1952 dout("writepages %llu~%llu (%d pages)\n", off, len,
1953 req->r_num_pages);
1954
1955 rc = ceph_osdc_start_request(osdc, req, nofail);
1956 if (!rc)
1957 rc = ceph_osdc_wait_request(osdc, req);
1958
1959 ceph_osdc_put_request(req);
1960 if (rc == 0)
1961 rc = len;
1962 dout("writepages result %d\n", rc);
1963 return rc;
1964 }
1965 EXPORT_SYMBOL(ceph_osdc_writepages);
1966
1967 /*
1968 * handle incoming message
1969 */
1970 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1971 {
1972 struct ceph_osd *osd = con->private;
1973 struct ceph_osd_client *osdc;
1974 int type = le16_to_cpu(msg->hdr.type);
1975
1976 if (!osd)
1977 goto out;
1978 osdc = osd->o_osdc;
1979
1980 switch (type) {
1981 case CEPH_MSG_OSD_MAP:
1982 ceph_osdc_handle_map(osdc, msg);
1983 break;
1984 case CEPH_MSG_OSD_OPREPLY:
1985 handle_reply(osdc, msg, con);
1986 break;
1987 case CEPH_MSG_WATCH_NOTIFY:
1988 handle_watch_notify(osdc, msg);
1989 break;
1990
1991 default:
1992 pr_err("received unknown message type %d %s\n", type,
1993 ceph_msg_type_name(type));
1994 }
1995 out:
1996 ceph_msg_put(msg);
1997 }
1998
1999 /*
2000 * lookup and return message for incoming reply. set up reply message
2001 * pages.
2002 */
2003 static struct ceph_msg *get_reply(struct ceph_connection *con,
2004 struct ceph_msg_header *hdr,
2005 int *skip)
2006 {
2007 struct ceph_osd *osd = con->private;
2008 struct ceph_osd_client *osdc = osd->o_osdc;
2009 struct ceph_msg *m;
2010 struct ceph_osd_request *req;
2011 int front = le32_to_cpu(hdr->front_len);
2012 int data_len = le32_to_cpu(hdr->data_len);
2013 u64 tid;
2014
2015 tid = le64_to_cpu(hdr->tid);
2016 mutex_lock(&osdc->request_mutex);
2017 req = __lookup_request(osdc, tid);
2018 if (!req) {
2019 *skip = 1;
2020 m = NULL;
2021 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2022 osd->o_osd);
2023 goto out;
2024 }
2025
2026 if (req->r_con_filling_msg) {
2027 dout("get_reply revoking msg %p from old con %p\n",
2028 req->r_reply, req->r_con_filling_msg);
2029 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2030 ceph_con_put(req->r_con_filling_msg);
2031 req->r_con_filling_msg = NULL;
2032 }
2033
2034 if (front > req->r_reply->front.iov_len) {
2035 pr_warning("get_reply front %d > preallocated %d\n",
2036 front, (int)req->r_reply->front.iov_len);
2037 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
2038 if (!m)
2039 goto out;
2040 ceph_msg_put(req->r_reply);
2041 req->r_reply = m;
2042 }
2043 m = ceph_msg_get(req->r_reply);
2044
2045 if (data_len > 0) {
2046 int want = calc_pages_for(req->r_page_alignment, data_len);
2047
2048 if (unlikely(req->r_num_pages < want)) {
2049 pr_warning("tid %lld reply has %d bytes %d pages, we"
2050 " had only %d pages ready\n", tid, data_len,
2051 want, req->r_num_pages);
2052 *skip = 1;
2053 ceph_msg_put(m);
2054 m = NULL;
2055 goto out;
2056 }
2057 m->pages = req->r_pages;
2058 m->nr_pages = req->r_num_pages;
2059 m->page_alignment = req->r_page_alignment;
2060 #ifdef CONFIG_BLOCK
2061 m->bio = req->r_bio;
2062 #endif
2063 }
2064 *skip = 0;
2065 req->r_con_filling_msg = ceph_con_get(con);
2066 dout("get_reply tid %lld %p\n", tid, m);
2067
2068 out:
2069 mutex_unlock(&osdc->request_mutex);
2070 return m;
2071
2072 }
2073
2074 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2075 struct ceph_msg_header *hdr,
2076 int *skip)
2077 {
2078 struct ceph_osd *osd = con->private;
2079 int type = le16_to_cpu(hdr->type);
2080 int front = le32_to_cpu(hdr->front_len);
2081
2082 switch (type) {
2083 case CEPH_MSG_OSD_MAP:
2084 case CEPH_MSG_WATCH_NOTIFY:
2085 return ceph_msg_new(type, front, GFP_NOFS);
2086 case CEPH_MSG_OSD_OPREPLY:
2087 return get_reply(con, hdr, skip);
2088 default:
2089 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2090 osd->o_osd);
2091 *skip = 1;
2092 return NULL;
2093 }
2094 }
2095
2096 /*
2097 * Wrappers to refcount containing ceph_osd struct
2098 */
2099 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2100 {
2101 struct ceph_osd *osd = con->private;
2102 if (get_osd(osd))
2103 return con;
2104 return NULL;
2105 }
2106
2107 static void put_osd_con(struct ceph_connection *con)
2108 {
2109 struct ceph_osd *osd = con->private;
2110 put_osd(osd);
2111 }
2112
2113 /*
2114 * authentication
2115 */
2116 static int get_authorizer(struct ceph_connection *con,
2117 void **buf, int *len, int *proto,
2118 void **reply_buf, int *reply_len, int force_new)
2119 {
2120 struct ceph_osd *o = con->private;
2121 struct ceph_osd_client *osdc = o->o_osdc;
2122 struct ceph_auth_client *ac = osdc->client->monc.auth;
2123 int ret = 0;
2124
2125 if (force_new && o->o_authorizer) {
2126 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2127 o->o_authorizer = NULL;
2128 }
2129 if (o->o_authorizer == NULL) {
2130 ret = ac->ops->create_authorizer(
2131 ac, CEPH_ENTITY_TYPE_OSD,
2132 &o->o_authorizer,
2133 &o->o_authorizer_buf,
2134 &o->o_authorizer_buf_len,
2135 &o->o_authorizer_reply_buf,
2136 &o->o_authorizer_reply_buf_len);
2137 if (ret)
2138 return ret;
2139 }
2140
2141 *proto = ac->protocol;
2142 *buf = o->o_authorizer_buf;
2143 *len = o->o_authorizer_buf_len;
2144 *reply_buf = o->o_authorizer_reply_buf;
2145 *reply_len = o->o_authorizer_reply_buf_len;
2146 return 0;
2147 }
2148
2149
2150 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2151 {
2152 struct ceph_osd *o = con->private;
2153 struct ceph_osd_client *osdc = o->o_osdc;
2154 struct ceph_auth_client *ac = osdc->client->monc.auth;
2155
2156 return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2157 }
2158
2159 static int invalidate_authorizer(struct ceph_connection *con)
2160 {
2161 struct ceph_osd *o = con->private;
2162 struct ceph_osd_client *osdc = o->o_osdc;
2163 struct ceph_auth_client *ac = osdc->client->monc.auth;
2164
2165 if (ac->ops->invalidate_authorizer)
2166 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2167
2168 return ceph_monc_validate_auth(&osdc->client->monc);
2169 }
2170
2171 static const struct ceph_connection_operations osd_con_ops = {
2172 .get = get_osd_con,
2173 .put = put_osd_con,
2174 .dispatch = dispatch,
2175 .get_authorizer = get_authorizer,
2176 .verify_authorizer_reply = verify_authorizer_reply,
2177 .invalidate_authorizer = invalidate_authorizer,
2178 .alloc_msg = alloc_msg,
2179 .fault = osd_reset,
2180 };
(deprecated) Btrfs devel tree