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net: only use a single page of slop in MAX_SKB_FRAGS
[linux-2.6.git] / net / ceph / osd_client.c
blobf4f3f58f5234c1a5ce5eb4b54638c730f571ffb9
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 INIT_LIST_HEAD(&req->r_req_lru_item);
221 req->r_flags = flags;
222
223 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
224
225 /* create reply message */
226 if (use_mempool)
227 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
228 else
229 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
230 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
231 if (!msg) {
232 ceph_osdc_put_request(req);
233 return NULL;
234 }
235 req->r_reply = msg;
236
237 /* allocate space for the trailing data */
238 if (needs_trail) {
239 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
240 if (!req->r_trail) {
241 ceph_osdc_put_request(req);
242 return NULL;
243 }
244 ceph_pagelist_init(req->r_trail);
245 }
246 /* create request message; allow space for oid */
247 msg_size += MAX_OBJ_NAME_SIZE;
248 if (snapc)
249 msg_size += sizeof(u64) * snapc->num_snaps;
250 if (use_mempool)
251 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
252 else
253 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
254 if (!msg) {
255 ceph_osdc_put_request(req);
256 return NULL;
257 }
258
259 msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
260 memset(msg->front.iov_base, 0, msg->front.iov_len);
261
262 req->r_request = msg;
263 req->r_pages = pages;
264 #ifdef CONFIG_BLOCK
265 if (bio) {
266 req->r_bio = bio;
267 bio_get(req->r_bio);
268 }
269 #endif
270
271 return req;
272 }
273 EXPORT_SYMBOL(ceph_osdc_alloc_request);
274
275 static void osd_req_encode_op(struct ceph_osd_request *req,
276 struct ceph_osd_op *dst,
277 struct ceph_osd_req_op *src)
278 {
279 dst->op = cpu_to_le16(src->op);
280
281 switch (dst->op) {
282 case CEPH_OSD_OP_READ:
283 case CEPH_OSD_OP_WRITE:
284 dst->extent.offset =
285 cpu_to_le64(src->extent.offset);
286 dst->extent.length =
287 cpu_to_le64(src->extent.length);
288 dst->extent.truncate_size =
289 cpu_to_le64(src->extent.truncate_size);
290 dst->extent.truncate_seq =
291 cpu_to_le32(src->extent.truncate_seq);
292 break;
293
294 case CEPH_OSD_OP_GETXATTR:
295 case CEPH_OSD_OP_SETXATTR:
296 case CEPH_OSD_OP_CMPXATTR:
297 BUG_ON(!req->r_trail);
298
299 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
300 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
301 dst->xattr.cmp_op = src->xattr.cmp_op;
302 dst->xattr.cmp_mode = src->xattr.cmp_mode;
303 ceph_pagelist_append(req->r_trail, src->xattr.name,
304 src->xattr.name_len);
305 ceph_pagelist_append(req->r_trail, src->xattr.val,
306 src->xattr.value_len);
307 break;
308 case CEPH_OSD_OP_CALL:
309 BUG_ON(!req->r_trail);
310
311 dst->cls.class_len = src->cls.class_len;
312 dst->cls.method_len = src->cls.method_len;
313 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
314
315 ceph_pagelist_append(req->r_trail, src->cls.class_name,
316 src->cls.class_len);
317 ceph_pagelist_append(req->r_trail, src->cls.method_name,
318 src->cls.method_len);
319 ceph_pagelist_append(req->r_trail, src->cls.indata,
320 src->cls.indata_len);
321 break;
322 case CEPH_OSD_OP_ROLLBACK:
323 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
324 break;
325 case CEPH_OSD_OP_STARTSYNC:
326 break;
327 case CEPH_OSD_OP_NOTIFY:
328 {
329 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
330 __le32 timeout = cpu_to_le32(src->watch.timeout);
331
332 BUG_ON(!req->r_trail);
333
334 ceph_pagelist_append(req->r_trail,
335 &prot_ver, sizeof(prot_ver));
336 ceph_pagelist_append(req->r_trail,
337 &timeout, sizeof(timeout));
338 }
339 case CEPH_OSD_OP_NOTIFY_ACK:
340 case CEPH_OSD_OP_WATCH:
341 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
342 dst->watch.ver = cpu_to_le64(src->watch.ver);
343 dst->watch.flag = src->watch.flag;
344 break;
345 default:
346 pr_err("unrecognized osd opcode %d\n", dst->op);
347 WARN_ON(1);
348 break;
349 }
350 dst->payload_len = cpu_to_le32(src->payload_len);
351 }
352
353 /*
354 * build new request AND message
355 *
356 */
357 void ceph_osdc_build_request(struct ceph_osd_request *req,
358 u64 off, u64 *plen,
359 struct ceph_osd_req_op *src_ops,
360 struct ceph_snap_context *snapc,
361 struct timespec *mtime,
362 const char *oid,
363 int oid_len)
364 {
365 struct ceph_msg *msg = req->r_request;
366 struct ceph_osd_request_head *head;
367 struct ceph_osd_req_op *src_op;
368 struct ceph_osd_op *op;
369 void *p;
370 int num_op = get_num_ops(src_ops, NULL);
371 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
372 int flags = req->r_flags;
373 u64 data_len = 0;
374 int i;
375
376 head = msg->front.iov_base;
377 op = (void *)(head + 1);
378 p = (void *)(op + num_op);
379
380 req->r_snapc = ceph_get_snap_context(snapc);
381
382 head->client_inc = cpu_to_le32(1); /* always, for now. */
383 head->flags = cpu_to_le32(flags);
384 if (flags & CEPH_OSD_FLAG_WRITE)
385 ceph_encode_timespec(&head->mtime, mtime);
386 head->num_ops = cpu_to_le16(num_op);
387
388
389 /* fill in oid */
390 head->object_len = cpu_to_le32(oid_len);
391 memcpy(p, oid, oid_len);
392 p += oid_len;
393
394 src_op = src_ops;
395 while (src_op->op) {
396 osd_req_encode_op(req, op, src_op);
397 src_op++;
398 op++;
399 }
400
401 if (req->r_trail)
402 data_len += req->r_trail->length;
403
404 if (snapc) {
405 head->snap_seq = cpu_to_le64(snapc->seq);
406 head->num_snaps = cpu_to_le32(snapc->num_snaps);
407 for (i = 0; i < snapc->num_snaps; i++) {
408 put_unaligned_le64(snapc->snaps[i], p);
409 p += sizeof(u64);
410 }
411 }
412
413 if (flags & CEPH_OSD_FLAG_WRITE) {
414 req->r_request->hdr.data_off = cpu_to_le16(off);
415 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
416 } else if (data_len) {
417 req->r_request->hdr.data_off = 0;
418 req->r_request->hdr.data_len = cpu_to_le32(data_len);
419 }
420
421 req->r_request->page_alignment = req->r_page_alignment;
422
423 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
424 msg_size = p - msg->front.iov_base;
425 msg->front.iov_len = msg_size;
426 msg->hdr.front_len = cpu_to_le32(msg_size);
427 return;
428 }
429 EXPORT_SYMBOL(ceph_osdc_build_request);
430
431 /*
432 * build new request AND message, calculate layout, and adjust file
433 * extent as needed.
434 *
435 * if the file was recently truncated, we include information about its
436 * old and new size so that the object can be updated appropriately. (we
437 * avoid synchronously deleting truncated objects because it's slow.)
438 *
439 * if @do_sync, include a 'startsync' command so that the osd will flush
440 * data quickly.
441 */
442 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
443 struct ceph_file_layout *layout,
444 struct ceph_vino vino,
445 u64 off, u64 *plen,
446 int opcode, int flags,
447 struct ceph_snap_context *snapc,
448 int do_sync,
449 u32 truncate_seq,
450 u64 truncate_size,
451 struct timespec *mtime,
452 bool use_mempool, int num_reply,
453 int page_align)
454 {
455 struct ceph_osd_req_op ops[3];
456 struct ceph_osd_request *req;
457
458 ops[0].op = opcode;
459 ops[0].extent.truncate_seq = truncate_seq;
460 ops[0].extent.truncate_size = truncate_size;
461 ops[0].payload_len = 0;
462
463 if (do_sync) {
464 ops[1].op = CEPH_OSD_OP_STARTSYNC;
465 ops[1].payload_len = 0;
466 ops[2].op = 0;
467 } else
468 ops[1].op = 0;
469
470 req = ceph_osdc_alloc_request(osdc, flags,
471 snapc, ops,
472 use_mempool,
473 GFP_NOFS, NULL, NULL);
474 if (!req)
475 return NULL;
476
477 /* calculate max write size */
478 calc_layout(osdc, vino, layout, off, plen, req, ops);
479 req->r_file_layout = *layout; /* keep a copy */
480
481 /* in case it differs from natural (file) alignment that
482 calc_layout filled in for us */
483 req->r_num_pages = calc_pages_for(page_align, *plen);
484 req->r_page_alignment = page_align;
485
486 ceph_osdc_build_request(req, off, plen, ops,
487 snapc,
488 mtime,
489 req->r_oid, req->r_oid_len);
490
491 return req;
492 }
493 EXPORT_SYMBOL(ceph_osdc_new_request);
494
495 /*
496 * We keep osd requests in an rbtree, sorted by ->r_tid.
497 */
498 static void __insert_request(struct ceph_osd_client *osdc,
499 struct ceph_osd_request *new)
500 {
501 struct rb_node **p = &osdc->requests.rb_node;
502 struct rb_node *parent = NULL;
503 struct ceph_osd_request *req = NULL;
504
505 while (*p) {
506 parent = *p;
507 req = rb_entry(parent, struct ceph_osd_request, r_node);
508 if (new->r_tid < req->r_tid)
509 p = &(*p)->rb_left;
510 else if (new->r_tid > req->r_tid)
511 p = &(*p)->rb_right;
512 else
513 BUG();
514 }
515
516 rb_link_node(&new->r_node, parent, p);
517 rb_insert_color(&new->r_node, &osdc->requests);
518 }
519
520 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
521 u64 tid)
522 {
523 struct ceph_osd_request *req;
524 struct rb_node *n = osdc->requests.rb_node;
525
526 while (n) {
527 req = rb_entry(n, struct ceph_osd_request, r_node);
528 if (tid < req->r_tid)
529 n = n->rb_left;
530 else if (tid > req->r_tid)
531 n = n->rb_right;
532 else
533 return req;
534 }
535 return NULL;
536 }
537
538 static struct ceph_osd_request *
539 __lookup_request_ge(struct ceph_osd_client *osdc,
540 u64 tid)
541 {
542 struct ceph_osd_request *req;
543 struct rb_node *n = osdc->requests.rb_node;
544
545 while (n) {
546 req = rb_entry(n, struct ceph_osd_request, r_node);
547 if (tid < req->r_tid) {
548 if (!n->rb_left)
549 return req;
550 n = n->rb_left;
551 } else if (tid > req->r_tid) {
552 n = n->rb_right;
553 } else {
554 return req;
555 }
556 }
557 return NULL;
558 }
559
560 /*
561 * Resubmit requests pending on the given osd.
562 */
563 static void __kick_osd_requests(struct ceph_osd_client *osdc,
564 struct ceph_osd *osd)
565 {
566 struct ceph_osd_request *req, *nreq;
567 int err;
568
569 dout("__kick_osd_requests osd%d\n", osd->o_osd);
570 err = __reset_osd(osdc, osd);
571 if (err == -EAGAIN)
572 return;
573
574 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
575 list_move(&req->r_req_lru_item, &osdc->req_unsent);
576 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
577 osd->o_osd);
578 if (!req->r_linger)
579 req->r_flags |= CEPH_OSD_FLAG_RETRY;
580 }
581
582 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
583 r_linger_osd) {
584 /*
585 * reregister request prior to unregistering linger so
586 * that r_osd is preserved.
587 */
588 BUG_ON(!list_empty(&req->r_req_lru_item));
589 __register_request(osdc, req);
590 list_add(&req->r_req_lru_item, &osdc->req_unsent);
591 list_add(&req->r_osd_item, &req->r_osd->o_requests);
592 __unregister_linger_request(osdc, req);
593 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
594 osd->o_osd);
595 }
596 }
597
598 static void kick_osd_requests(struct ceph_osd_client *osdc,
599 struct ceph_osd *kickosd)
600 {
601 mutex_lock(&osdc->request_mutex);
602 __kick_osd_requests(osdc, kickosd);
603 mutex_unlock(&osdc->request_mutex);
604 }
605
606 /*
607 * If the osd connection drops, we need to resubmit all requests.
608 */
609 static void osd_reset(struct ceph_connection *con)
610 {
611 struct ceph_osd *osd = con->private;
612 struct ceph_osd_client *osdc;
613
614 if (!osd)
615 return;
616 dout("osd_reset osd%d\n", osd->o_osd);
617 osdc = osd->o_osdc;
618 down_read(&osdc->map_sem);
619 kick_osd_requests(osdc, osd);
620 send_queued(osdc);
621 up_read(&osdc->map_sem);
622 }
623
624 /*
625 * Track open sessions with osds.
626 */
627 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
628 {
629 struct ceph_osd *osd;
630
631 osd = kzalloc(sizeof(*osd), GFP_NOFS);
632 if (!osd)
633 return NULL;
634
635 atomic_set(&osd->o_ref, 1);
636 osd->o_osdc = osdc;
637 INIT_LIST_HEAD(&osd->o_requests);
638 INIT_LIST_HEAD(&osd->o_linger_requests);
639 INIT_LIST_HEAD(&osd->o_osd_lru);
640 osd->o_incarnation = 1;
641
642 ceph_con_init(osdc->client->msgr, &osd->o_con);
643 osd->o_con.private = osd;
644 osd->o_con.ops = &osd_con_ops;
645 osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
646
647 INIT_LIST_HEAD(&osd->o_keepalive_item);
648 return osd;
649 }
650
651 static struct ceph_osd *get_osd(struct ceph_osd *osd)
652 {
653 if (atomic_inc_not_zero(&osd->o_ref)) {
654 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
655 atomic_read(&osd->o_ref));
656 return osd;
657 } else {
658 dout("get_osd %p FAIL\n", osd);
659 return NULL;
660 }
661 }
662
663 static void put_osd(struct ceph_osd *osd)
664 {
665 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
666 atomic_read(&osd->o_ref) - 1);
667 if (atomic_dec_and_test(&osd->o_ref)) {
668 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
669
670 if (osd->o_authorizer)
671 ac->ops->destroy_authorizer(ac, osd->o_authorizer);
672 kfree(osd);
673 }
674 }
675
676 /*
677 * remove an osd from our map
678 */
679 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
680 {
681 dout("__remove_osd %p\n", osd);
682 BUG_ON(!list_empty(&osd->o_requests));
683 rb_erase(&osd->o_node, &osdc->osds);
684 list_del_init(&osd->o_osd_lru);
685 ceph_con_close(&osd->o_con);
686 put_osd(osd);
687 }
688
689 static void remove_all_osds(struct ceph_osd_client *osdc)
690 {
691 dout("__remove_old_osds %p\n", osdc);
692 mutex_lock(&osdc->request_mutex);
693 while (!RB_EMPTY_ROOT(&osdc->osds)) {
694 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
695 struct ceph_osd, o_node);
696 __remove_osd(osdc, osd);
697 }
698 mutex_unlock(&osdc->request_mutex);
699 }
700
701 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
702 struct ceph_osd *osd)
703 {
704 dout("__move_osd_to_lru %p\n", osd);
705 BUG_ON(!list_empty(&osd->o_osd_lru));
706 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
707 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
708 }
709
710 static void __remove_osd_from_lru(struct ceph_osd *osd)
711 {
712 dout("__remove_osd_from_lru %p\n", osd);
713 if (!list_empty(&osd->o_osd_lru))
714 list_del_init(&osd->o_osd_lru);
715 }
716
717 static void remove_old_osds(struct ceph_osd_client *osdc)
718 {
719 struct ceph_osd *osd, *nosd;
720
721 dout("__remove_old_osds %p\n", osdc);
722 mutex_lock(&osdc->request_mutex);
723 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
724 if (time_before(jiffies, osd->lru_ttl))
725 break;
726 __remove_osd(osdc, osd);
727 }
728 mutex_unlock(&osdc->request_mutex);
729 }
730
731 /*
732 * reset osd connect
733 */
734 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
735 {
736 struct ceph_osd_request *req;
737 int ret = 0;
738
739 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
740 if (list_empty(&osd->o_requests) &&
741 list_empty(&osd->o_linger_requests)) {
742 __remove_osd(osdc, osd);
743 } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
744 &osd->o_con.peer_addr,
745 sizeof(osd->o_con.peer_addr)) == 0 &&
746 !ceph_con_opened(&osd->o_con)) {
747 dout(" osd addr hasn't changed and connection never opened,"
748 " letting msgr retry");
749 /* touch each r_stamp for handle_timeout()'s benfit */
750 list_for_each_entry(req, &osd->o_requests, r_osd_item)
751 req->r_stamp = jiffies;
752 ret = -EAGAIN;
753 } else {
754 ceph_con_close(&osd->o_con);
755 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
756 osd->o_incarnation++;
757 }
758 return ret;
759 }
760
761 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
762 {
763 struct rb_node **p = &osdc->osds.rb_node;
764 struct rb_node *parent = NULL;
765 struct ceph_osd *osd = NULL;
766
767 dout("__insert_osd %p osd%d\n", new, new->o_osd);
768 while (*p) {
769 parent = *p;
770 osd = rb_entry(parent, struct ceph_osd, o_node);
771 if (new->o_osd < osd->o_osd)
772 p = &(*p)->rb_left;
773 else if (new->o_osd > osd->o_osd)
774 p = &(*p)->rb_right;
775 else
776 BUG();
777 }
778
779 rb_link_node(&new->o_node, parent, p);
780 rb_insert_color(&new->o_node, &osdc->osds);
781 }
782
783 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
784 {
785 struct ceph_osd *osd;
786 struct rb_node *n = osdc->osds.rb_node;
787
788 while (n) {
789 osd = rb_entry(n, struct ceph_osd, o_node);
790 if (o < osd->o_osd)
791 n = n->rb_left;
792 else if (o > osd->o_osd)
793 n = n->rb_right;
794 else
795 return osd;
796 }
797 return NULL;
798 }
799
800 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
801 {
802 schedule_delayed_work(&osdc->timeout_work,
803 osdc->client->options->osd_keepalive_timeout * HZ);
804 }
805
806 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
807 {
808 cancel_delayed_work(&osdc->timeout_work);
809 }
810
811 /*
812 * Register request, assign tid. If this is the first request, set up
813 * the timeout event.
814 */
815 static void __register_request(struct ceph_osd_client *osdc,
816 struct ceph_osd_request *req)
817 {
818 req->r_tid = ++osdc->last_tid;
819 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
820 dout("__register_request %p tid %lld\n", req, req->r_tid);
821 __insert_request(osdc, req);
822 ceph_osdc_get_request(req);
823 osdc->num_requests++;
824 if (osdc->num_requests == 1) {
825 dout(" first request, scheduling timeout\n");
826 __schedule_osd_timeout(osdc);
827 }
828 }
829
830 static void register_request(struct ceph_osd_client *osdc,
831 struct ceph_osd_request *req)
832 {
833 mutex_lock(&osdc->request_mutex);
834 __register_request(osdc, req);
835 mutex_unlock(&osdc->request_mutex);
836 }
837
838 /*
839 * called under osdc->request_mutex
840 */
841 static void __unregister_request(struct ceph_osd_client *osdc,
842 struct ceph_osd_request *req)
843 {
844 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
845 rb_erase(&req->r_node, &osdc->requests);
846 osdc->num_requests--;
847
848 if (req->r_osd) {
849 /* make sure the original request isn't in flight. */
850 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
851
852 list_del_init(&req->r_osd_item);
853 if (list_empty(&req->r_osd->o_requests) &&
854 list_empty(&req->r_osd->o_linger_requests)) {
855 dout("moving osd to %p lru\n", req->r_osd);
856 __move_osd_to_lru(osdc, req->r_osd);
857 }
858 if (list_empty(&req->r_linger_item))
859 req->r_osd = NULL;
860 }
861
862 ceph_osdc_put_request(req);
863
864 list_del_init(&req->r_req_lru_item);
865 if (osdc->num_requests == 0) {
866 dout(" no requests, canceling timeout\n");
867 __cancel_osd_timeout(osdc);
868 }
869 }
870
871 /*
872 * Cancel a previously queued request message
873 */
874 static void __cancel_request(struct ceph_osd_request *req)
875 {
876 if (req->r_sent && req->r_osd) {
877 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
878 req->r_sent = 0;
879 }
880 }
881
882 static void __register_linger_request(struct ceph_osd_client *osdc,
883 struct ceph_osd_request *req)
884 {
885 dout("__register_linger_request %p\n", req);
886 list_add_tail(&req->r_linger_item, &osdc->req_linger);
887 list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
888 }
889
890 static void __unregister_linger_request(struct ceph_osd_client *osdc,
891 struct ceph_osd_request *req)
892 {
893 dout("__unregister_linger_request %p\n", req);
894 if (req->r_osd) {
895 list_del_init(&req->r_linger_item);
896 list_del_init(&req->r_linger_osd);
897
898 if (list_empty(&req->r_osd->o_requests) &&
899 list_empty(&req->r_osd->o_linger_requests)) {
900 dout("moving osd to %p lru\n", req->r_osd);
901 __move_osd_to_lru(osdc, req->r_osd);
902 }
903 if (list_empty(&req->r_osd_item))
904 req->r_osd = NULL;
905 }
906 }
907
908 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
909 struct ceph_osd_request *req)
910 {
911 mutex_lock(&osdc->request_mutex);
912 if (req->r_linger) {
913 __unregister_linger_request(osdc, req);
914 ceph_osdc_put_request(req);
915 }
916 mutex_unlock(&osdc->request_mutex);
917 }
918 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
919
920 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
921 struct ceph_osd_request *req)
922 {
923 if (!req->r_linger) {
924 dout("set_request_linger %p\n", req);
925 req->r_linger = 1;
926 /*
927 * caller is now responsible for calling
928 * unregister_linger_request
929 */
930 ceph_osdc_get_request(req);
931 }
932 }
933 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
934
935 /*
936 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
937 * (as needed), and set the request r_osd appropriately. If there is
938 * no up osd, set r_osd to NULL. Move the request to the appropriate list
939 * (unsent, homeless) or leave on in-flight lru.
940 *
941 * Return 0 if unchanged, 1 if changed, or negative on error.
942 *
943 * Caller should hold map_sem for read and request_mutex.
944 */
945 static int __map_request(struct ceph_osd_client *osdc,
946 struct ceph_osd_request *req, int force_resend)
947 {
948 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
949 struct ceph_pg pgid;
950 int acting[CEPH_PG_MAX_SIZE];
951 int o = -1, num = 0;
952 int err;
953
954 dout("map_request %p tid %lld\n", req, req->r_tid);
955 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
956 &req->r_file_layout, osdc->osdmap);
957 if (err) {
958 list_move(&req->r_req_lru_item, &osdc->req_notarget);
959 return err;
960 }
961 pgid = reqhead->layout.ol_pgid;
962 req->r_pgid = pgid;
963
964 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
965 if (err > 0) {
966 o = acting[0];
967 num = err;
968 }
969
970 if ((!force_resend &&
971 req->r_osd && req->r_osd->o_osd == o &&
972 req->r_sent >= req->r_osd->o_incarnation &&
973 req->r_num_pg_osds == num &&
974 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
975 (req->r_osd == NULL && o == -1))
976 return 0; /* no change */
977
978 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
979 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
980 req->r_osd ? req->r_osd->o_osd : -1);
981
982 /* record full pg acting set */
983 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
984 req->r_num_pg_osds = num;
985
986 if (req->r_osd) {
987 __cancel_request(req);
988 list_del_init(&req->r_osd_item);
989 req->r_osd = NULL;
990 }
991
992 req->r_osd = __lookup_osd(osdc, o);
993 if (!req->r_osd && o >= 0) {
994 err = -ENOMEM;
995 req->r_osd = create_osd(osdc);
996 if (!req->r_osd) {
997 list_move(&req->r_req_lru_item, &osdc->req_notarget);
998 goto out;
999 }
1000
1001 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1002 req->r_osd->o_osd = o;
1003 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
1004 __insert_osd(osdc, req->r_osd);
1005
1006 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
1007 }
1008
1009 if (req->r_osd) {
1010 __remove_osd_from_lru(req->r_osd);
1011 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1012 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1013 } else {
1014 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1015 }
1016 err = 1; /* osd or pg changed */
1017
1018 out:
1019 return err;
1020 }
1021
1022 /*
1023 * caller should hold map_sem (for read) and request_mutex
1024 */
1025 static int __send_request(struct ceph_osd_client *osdc,
1026 struct ceph_osd_request *req)
1027 {
1028 struct ceph_osd_request_head *reqhead;
1029
1030 dout("send_request %p tid %llu to osd%d flags %d\n",
1031 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1032
1033 reqhead = req->r_request->front.iov_base;
1034 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1035 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1036 reqhead->reassert_version = req->r_reassert_version;
1037
1038 req->r_stamp = jiffies;
1039 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1040
1041 ceph_msg_get(req->r_request); /* send consumes a ref */
1042 ceph_con_send(&req->r_osd->o_con, req->r_request);
1043 req->r_sent = req->r_osd->o_incarnation;
1044 return 0;
1045 }
1046
1047 /*
1048 * Send any requests in the queue (req_unsent).
1049 */
1050 static void send_queued(struct ceph_osd_client *osdc)
1051 {
1052 struct ceph_osd_request *req, *tmp;
1053
1054 dout("send_queued\n");
1055 mutex_lock(&osdc->request_mutex);
1056 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1057 __send_request(osdc, req);
1058 }
1059 mutex_unlock(&osdc->request_mutex);
1060 }
1061
1062 /*
1063 * Timeout callback, called every N seconds when 1 or more osd
1064 * requests has been active for more than N seconds. When this
1065 * happens, we ping all OSDs with requests who have timed out to
1066 * ensure any communications channel reset is detected. Reset the
1067 * request timeouts another N seconds in the future as we go.
1068 * Reschedule the timeout event another N seconds in future (unless
1069 * there are no open requests).
1070 */
1071 static void handle_timeout(struct work_struct *work)
1072 {
1073 struct ceph_osd_client *osdc =
1074 container_of(work, struct ceph_osd_client, timeout_work.work);
1075 struct ceph_osd_request *req, *last_req = NULL;
1076 struct ceph_osd *osd;
1077 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1078 unsigned long keepalive =
1079 osdc->client->options->osd_keepalive_timeout * HZ;
1080 unsigned long last_stamp = 0;
1081 struct list_head slow_osds;
1082 dout("timeout\n");
1083 down_read(&osdc->map_sem);
1084
1085 ceph_monc_request_next_osdmap(&osdc->client->monc);
1086
1087 mutex_lock(&osdc->request_mutex);
1088
1089 /*
1090 * reset osds that appear to be _really_ unresponsive. this
1091 * is a failsafe measure.. we really shouldn't be getting to
1092 * this point if the system is working properly. the monitors
1093 * should mark the osd as failed and we should find out about
1094 * it from an updated osd map.
1095 */
1096 while (timeout && !list_empty(&osdc->req_lru)) {
1097 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1098 r_req_lru_item);
1099
1100 /* hasn't been long enough since we sent it? */
1101 if (time_before(jiffies, req->r_stamp + timeout))
1102 break;
1103
1104 /* hasn't been long enough since it was acked? */
1105 if (req->r_request->ack_stamp == 0 ||
1106 time_before(jiffies, req->r_request->ack_stamp + timeout))
1107 break;
1108
1109 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1110 last_req = req;
1111 last_stamp = req->r_stamp;
1112
1113 osd = req->r_osd;
1114 BUG_ON(!osd);
1115 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1116 req->r_tid, osd->o_osd);
1117 __kick_osd_requests(osdc, osd);
1118 }
1119
1120 /*
1121 * ping osds that are a bit slow. this ensures that if there
1122 * is a break in the TCP connection we will notice, and reopen
1123 * a connection with that osd (from the fault callback).
1124 */
1125 INIT_LIST_HEAD(&slow_osds);
1126 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1127 if (time_before(jiffies, req->r_stamp + keepalive))
1128 break;
1129
1130 osd = req->r_osd;
1131 BUG_ON(!osd);
1132 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1133 req->r_tid, osd->o_osd);
1134 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1135 }
1136 while (!list_empty(&slow_osds)) {
1137 osd = list_entry(slow_osds.next, struct ceph_osd,
1138 o_keepalive_item);
1139 list_del_init(&osd->o_keepalive_item);
1140 ceph_con_keepalive(&osd->o_con);
1141 }
1142
1143 __schedule_osd_timeout(osdc);
1144 mutex_unlock(&osdc->request_mutex);
1145 send_queued(osdc);
1146 up_read(&osdc->map_sem);
1147 }
1148
1149 static void handle_osds_timeout(struct work_struct *work)
1150 {
1151 struct ceph_osd_client *osdc =
1152 container_of(work, struct ceph_osd_client,
1153 osds_timeout_work.work);
1154 unsigned long delay =
1155 osdc->client->options->osd_idle_ttl * HZ >> 2;
1156
1157 dout("osds timeout\n");
1158 down_read(&osdc->map_sem);
1159 remove_old_osds(osdc);
1160 up_read(&osdc->map_sem);
1161
1162 schedule_delayed_work(&osdc->osds_timeout_work,
1163 round_jiffies_relative(delay));
1164 }
1165
1166 static void complete_request(struct ceph_osd_request *req)
1167 {
1168 if (req->r_safe_callback)
1169 req->r_safe_callback(req, NULL);
1170 complete_all(&req->r_safe_completion); /* fsync waiter */
1171 }
1172
1173 /*
1174 * handle osd op reply. either call the callback if it is specified,
1175 * or do the completion to wake up the waiting thread.
1176 */
1177 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1178 struct ceph_connection *con)
1179 {
1180 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1181 struct ceph_osd_request *req;
1182 u64 tid;
1183 int numops, object_len, flags;
1184 s32 result;
1185
1186 tid = le64_to_cpu(msg->hdr.tid);
1187 if (msg->front.iov_len < sizeof(*rhead))
1188 goto bad;
1189 numops = le32_to_cpu(rhead->num_ops);
1190 object_len = le32_to_cpu(rhead->object_len);
1191 result = le32_to_cpu(rhead->result);
1192 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1193 numops * sizeof(struct ceph_osd_op))
1194 goto bad;
1195 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1196 /* lookup */
1197 mutex_lock(&osdc->request_mutex);
1198 req = __lookup_request(osdc, tid);
1199 if (req == NULL) {
1200 dout("handle_reply tid %llu dne\n", tid);
1201 mutex_unlock(&osdc->request_mutex);
1202 return;
1203 }
1204 ceph_osdc_get_request(req);
1205 flags = le32_to_cpu(rhead->flags);
1206
1207 /*
1208 * if this connection filled our message, drop our reference now, to
1209 * avoid a (safe but slower) revoke later.
1210 */
1211 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1212 dout(" dropping con_filling_msg ref %p\n", con);
1213 req->r_con_filling_msg = NULL;
1214 ceph_con_put(con);
1215 }
1216
1217 if (!req->r_got_reply) {
1218 unsigned bytes;
1219
1220 req->r_result = le32_to_cpu(rhead->result);
1221 bytes = le32_to_cpu(msg->hdr.data_len);
1222 dout("handle_reply result %d bytes %d\n", req->r_result,
1223 bytes);
1224 if (req->r_result == 0)
1225 req->r_result = bytes;
1226
1227 /* in case this is a write and we need to replay, */
1228 req->r_reassert_version = rhead->reassert_version;
1229
1230 req->r_got_reply = 1;
1231 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1232 dout("handle_reply tid %llu dup ack\n", tid);
1233 mutex_unlock(&osdc->request_mutex);
1234 goto done;
1235 }
1236
1237 dout("handle_reply tid %llu flags %d\n", tid, flags);
1238
1239 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1240 __register_linger_request(osdc, req);
1241
1242 /* either this is a read, or we got the safe response */
1243 if (result < 0 ||
1244 (flags & CEPH_OSD_FLAG_ONDISK) ||
1245 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1246 __unregister_request(osdc, req);
1247
1248 mutex_unlock(&osdc->request_mutex);
1249
1250 if (req->r_callback)
1251 req->r_callback(req, msg);
1252 else
1253 complete_all(&req->r_completion);
1254
1255 if (flags & CEPH_OSD_FLAG_ONDISK)
1256 complete_request(req);
1257
1258 done:
1259 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1260 ceph_osdc_put_request(req);
1261 return;
1262
1263 bad:
1264 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1265 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1266 (int)sizeof(*rhead));
1267 ceph_msg_dump(msg);
1268 }
1269
1270 static void reset_changed_osds(struct ceph_osd_client *osdc)
1271 {
1272 struct rb_node *p, *n;
1273
1274 for (p = rb_first(&osdc->osds); p; p = n) {
1275 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1276
1277 n = rb_next(p);
1278 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1279 memcmp(&osd->o_con.peer_addr,
1280 ceph_osd_addr(osdc->osdmap,
1281 osd->o_osd),
1282 sizeof(struct ceph_entity_addr)) != 0)
1283 __reset_osd(osdc, osd);
1284 }
1285 }
1286
1287 /*
1288 * Requeue requests whose mapping to an OSD has changed. If requests map to
1289 * no osd, request a new map.
1290 *
1291 * Caller should hold map_sem for read and request_mutex.
1292 */
1293 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1294 {
1295 struct ceph_osd_request *req, *nreq;
1296 struct rb_node *p;
1297 int needmap = 0;
1298 int err;
1299
1300 dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1301 mutex_lock(&osdc->request_mutex);
1302 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1303 req = rb_entry(p, struct ceph_osd_request, r_node);
1304 err = __map_request(osdc, req, force_resend);
1305 if (err < 0)
1306 continue; /* error */
1307 if (req->r_osd == NULL) {
1308 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1309 needmap++; /* request a newer map */
1310 } else if (err > 0) {
1311 dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1312 req->r_osd ? req->r_osd->o_osd : -1);
1313 if (!req->r_linger)
1314 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1315 }
1316 }
1317
1318 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1319 r_linger_item) {
1320 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1321
1322 err = __map_request(osdc, req, force_resend);
1323 if (err == 0)
1324 continue; /* no change and no osd was specified */
1325 if (err < 0)
1326 continue; /* hrm! */
1327 if (req->r_osd == NULL) {
1328 dout("tid %llu maps to no valid osd\n", req->r_tid);
1329 needmap++; /* request a newer map */
1330 continue;
1331 }
1332
1333 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1334 req->r_osd ? req->r_osd->o_osd : -1);
1335 __unregister_linger_request(osdc, req);
1336 __register_request(osdc, req);
1337 }
1338 mutex_unlock(&osdc->request_mutex);
1339
1340 if (needmap) {
1341 dout("%d requests for down osds, need new map\n", needmap);
1342 ceph_monc_request_next_osdmap(&osdc->client->monc);
1343 }
1344 }
1345
1346
1347 /*
1348 * Process updated osd map.
1349 *
1350 * The message contains any number of incremental and full maps, normally
1351 * indicating some sort of topology change in the cluster. Kick requests
1352 * off to different OSDs as needed.
1353 */
1354 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1355 {
1356 void *p, *end, *next;
1357 u32 nr_maps, maplen;
1358 u32 epoch;
1359 struct ceph_osdmap *newmap = NULL, *oldmap;
1360 int err;
1361 struct ceph_fsid fsid;
1362
1363 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1364 p = msg->front.iov_base;
1365 end = p + msg->front.iov_len;
1366
1367 /* verify fsid */
1368 ceph_decode_need(&p, end, sizeof(fsid), bad);
1369 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1370 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1371 return;
1372
1373 down_write(&osdc->map_sem);
1374
1375 /* incremental maps */
1376 ceph_decode_32_safe(&p, end, nr_maps, bad);
1377 dout(" %d inc maps\n", nr_maps);
1378 while (nr_maps > 0) {
1379 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1380 epoch = ceph_decode_32(&p);
1381 maplen = ceph_decode_32(&p);
1382 ceph_decode_need(&p, end, maplen, bad);
1383 next = p + maplen;
1384 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1385 dout("applying incremental map %u len %d\n",
1386 epoch, maplen);
1387 newmap = osdmap_apply_incremental(&p, next,
1388 osdc->osdmap,
1389 osdc->client->msgr);
1390 if (IS_ERR(newmap)) {
1391 err = PTR_ERR(newmap);
1392 goto bad;
1393 }
1394 BUG_ON(!newmap);
1395 if (newmap != osdc->osdmap) {
1396 ceph_osdmap_destroy(osdc->osdmap);
1397 osdc->osdmap = newmap;
1398 }
1399 kick_requests(osdc, 0);
1400 reset_changed_osds(osdc);
1401 } else {
1402 dout("ignoring incremental map %u len %d\n",
1403 epoch, maplen);
1404 }
1405 p = next;
1406 nr_maps--;
1407 }
1408 if (newmap)
1409 goto done;
1410
1411 /* full maps */
1412 ceph_decode_32_safe(&p, end, nr_maps, bad);
1413 dout(" %d full maps\n", nr_maps);
1414 while (nr_maps) {
1415 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1416 epoch = ceph_decode_32(&p);
1417 maplen = ceph_decode_32(&p);
1418 ceph_decode_need(&p, end, maplen, bad);
1419 if (nr_maps > 1) {
1420 dout("skipping non-latest full map %u len %d\n",
1421 epoch, maplen);
1422 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1423 dout("skipping full map %u len %d, "
1424 "older than our %u\n", epoch, maplen,
1425 osdc->osdmap->epoch);
1426 } else {
1427 int skipped_map = 0;
1428
1429 dout("taking full map %u len %d\n", epoch, maplen);
1430 newmap = osdmap_decode(&p, p+maplen);
1431 if (IS_ERR(newmap)) {
1432 err = PTR_ERR(newmap);
1433 goto bad;
1434 }
1435 BUG_ON(!newmap);
1436 oldmap = osdc->osdmap;
1437 osdc->osdmap = newmap;
1438 if (oldmap) {
1439 if (oldmap->epoch + 1 < newmap->epoch)
1440 skipped_map = 1;
1441 ceph_osdmap_destroy(oldmap);
1442 }
1443 kick_requests(osdc, skipped_map);
1444 }
1445 p += maplen;
1446 nr_maps--;
1447 }
1448
1449 done:
1450 downgrade_write(&osdc->map_sem);
1451 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1452
1453 /*
1454 * subscribe to subsequent osdmap updates if full to ensure
1455 * we find out when we are no longer full and stop returning
1456 * ENOSPC.
1457 */
1458 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1459 ceph_monc_request_next_osdmap(&osdc->client->monc);
1460
1461 send_queued(osdc);
1462 up_read(&osdc->map_sem);
1463 wake_up_all(&osdc->client->auth_wq);
1464 return;
1465
1466 bad:
1467 pr_err("osdc handle_map corrupt msg\n");
1468 ceph_msg_dump(msg);
1469 up_write(&osdc->map_sem);
1470 return;
1471 }
1472
1473 /*
1474 * watch/notify callback event infrastructure
1475 *
1476 * These callbacks are used both for watch and notify operations.
1477 */
1478 static void __release_event(struct kref *kref)
1479 {
1480 struct ceph_osd_event *event =
1481 container_of(kref, struct ceph_osd_event, kref);
1482
1483 dout("__release_event %p\n", event);
1484 kfree(event);
1485 }
1486
1487 static void get_event(struct ceph_osd_event *event)
1488 {
1489 kref_get(&event->kref);
1490 }
1491
1492 void ceph_osdc_put_event(struct ceph_osd_event *event)
1493 {
1494 kref_put(&event->kref, __release_event);
1495 }
1496 EXPORT_SYMBOL(ceph_osdc_put_event);
1497
1498 static void __insert_event(struct ceph_osd_client *osdc,
1499 struct ceph_osd_event *new)
1500 {
1501 struct rb_node **p = &osdc->event_tree.rb_node;
1502 struct rb_node *parent = NULL;
1503 struct ceph_osd_event *event = NULL;
1504
1505 while (*p) {
1506 parent = *p;
1507 event = rb_entry(parent, struct ceph_osd_event, node);
1508 if (new->cookie < event->cookie)
1509 p = &(*p)->rb_left;
1510 else if (new->cookie > event->cookie)
1511 p = &(*p)->rb_right;
1512 else
1513 BUG();
1514 }
1515
1516 rb_link_node(&new->node, parent, p);
1517 rb_insert_color(&new->node, &osdc->event_tree);
1518 }
1519
1520 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1521 u64 cookie)
1522 {
1523 struct rb_node **p = &osdc->event_tree.rb_node;
1524 struct rb_node *parent = NULL;
1525 struct ceph_osd_event *event = NULL;
1526
1527 while (*p) {
1528 parent = *p;
1529 event = rb_entry(parent, struct ceph_osd_event, node);
1530 if (cookie < event->cookie)
1531 p = &(*p)->rb_left;
1532 else if (cookie > event->cookie)
1533 p = &(*p)->rb_right;
1534 else
1535 return event;
1536 }
1537 return NULL;
1538 }
1539
1540 static void __remove_event(struct ceph_osd_event *event)
1541 {
1542 struct ceph_osd_client *osdc = event->osdc;
1543
1544 if (!RB_EMPTY_NODE(&event->node)) {
1545 dout("__remove_event removed %p\n", event);
1546 rb_erase(&event->node, &osdc->event_tree);
1547 ceph_osdc_put_event(event);
1548 } else {
1549 dout("__remove_event didn't remove %p\n", event);
1550 }
1551 }
1552
1553 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1554 void (*event_cb)(u64, u64, u8, void *),
1555 int one_shot, void *data,
1556 struct ceph_osd_event **pevent)
1557 {
1558 struct ceph_osd_event *event;
1559
1560 event = kmalloc(sizeof(*event), GFP_NOIO);
1561 if (!event)
1562 return -ENOMEM;
1563
1564 dout("create_event %p\n", event);
1565 event->cb = event_cb;
1566 event->one_shot = one_shot;
1567 event->data = data;
1568 event->osdc = osdc;
1569 INIT_LIST_HEAD(&event->osd_node);
1570 kref_init(&event->kref); /* one ref for us */
1571 kref_get(&event->kref); /* one ref for the caller */
1572 init_completion(&event->completion);
1573
1574 spin_lock(&osdc->event_lock);
1575 event->cookie = ++osdc->event_count;
1576 __insert_event(osdc, event);
1577 spin_unlock(&osdc->event_lock);
1578
1579 *pevent = event;
1580 return 0;
1581 }
1582 EXPORT_SYMBOL(ceph_osdc_create_event);
1583
1584 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1585 {
1586 struct ceph_osd_client *osdc = event->osdc;
1587
1588 dout("cancel_event %p\n", event);
1589 spin_lock(&osdc->event_lock);
1590 __remove_event(event);
1591 spin_unlock(&osdc->event_lock);
1592 ceph_osdc_put_event(event); /* caller's */
1593 }
1594 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1595
1596
1597 static void do_event_work(struct work_struct *work)
1598 {
1599 struct ceph_osd_event_work *event_work =
1600 container_of(work, struct ceph_osd_event_work, work);
1601 struct ceph_osd_event *event = event_work->event;
1602 u64 ver = event_work->ver;
1603 u64 notify_id = event_work->notify_id;
1604 u8 opcode = event_work->opcode;
1605
1606 dout("do_event_work completing %p\n", event);
1607 event->cb(ver, notify_id, opcode, event->data);
1608 complete(&event->completion);
1609 dout("do_event_work completed %p\n", event);
1610 ceph_osdc_put_event(event);
1611 kfree(event_work);
1612 }
1613
1614
1615 /*
1616 * Process osd watch notifications
1617 */
1618 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1619 {
1620 void *p, *end;
1621 u8 proto_ver;
1622 u64 cookie, ver, notify_id;
1623 u8 opcode;
1624 struct ceph_osd_event *event;
1625 struct ceph_osd_event_work *event_work;
1626
1627 p = msg->front.iov_base;
1628 end = p + msg->front.iov_len;
1629
1630 ceph_decode_8_safe(&p, end, proto_ver, bad);
1631 ceph_decode_8_safe(&p, end, opcode, bad);
1632 ceph_decode_64_safe(&p, end, cookie, bad);
1633 ceph_decode_64_safe(&p, end, ver, bad);
1634 ceph_decode_64_safe(&p, end, notify_id, bad);
1635
1636 spin_lock(&osdc->event_lock);
1637 event = __find_event(osdc, cookie);
1638 if (event) {
1639 get_event(event);
1640 if (event->one_shot)
1641 __remove_event(event);
1642 }
1643 spin_unlock(&osdc->event_lock);
1644 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1645 cookie, ver, event);
1646 if (event) {
1647 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1648 if (!event_work) {
1649 dout("ERROR: could not allocate event_work\n");
1650 goto done_err;
1651 }
1652 INIT_WORK(&event_work->work, do_event_work);
1653 event_work->event = event;
1654 event_work->ver = ver;
1655 event_work->notify_id = notify_id;
1656 event_work->opcode = opcode;
1657 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1658 dout("WARNING: failed to queue notify event work\n");
1659 goto done_err;
1660 }
1661 }
1662
1663 return;
1664
1665 done_err:
1666 complete(&event->completion);
1667 ceph_osdc_put_event(event);
1668 return;
1669
1670 bad:
1671 pr_err("osdc handle_watch_notify corrupt msg\n");
1672 return;
1673 }
1674
1675 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1676 {
1677 int err;
1678
1679 dout("wait_event %p\n", event);
1680 err = wait_for_completion_interruptible_timeout(&event->completion,
1681 timeout * HZ);
1682 ceph_osdc_put_event(event);
1683 if (err > 0)
1684 err = 0;
1685 dout("wait_event %p returns %d\n", event, err);
1686 return err;
1687 }
1688 EXPORT_SYMBOL(ceph_osdc_wait_event);
1689
1690 /*
1691 * Register request, send initial attempt.
1692 */
1693 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1694 struct ceph_osd_request *req,
1695 bool nofail)
1696 {
1697 int rc = 0;
1698
1699 req->r_request->pages = req->r_pages;
1700 req->r_request->nr_pages = req->r_num_pages;
1701 #ifdef CONFIG_BLOCK
1702 req->r_request->bio = req->r_bio;
1703 #endif
1704 req->r_request->trail = req->r_trail;
1705
1706 register_request(osdc, req);
1707
1708 down_read(&osdc->map_sem);
1709 mutex_lock(&osdc->request_mutex);
1710 /*
1711 * a racing kick_requests() may have sent the message for us
1712 * while we dropped request_mutex above, so only send now if
1713 * the request still han't been touched yet.
1714 */
1715 if (req->r_sent == 0) {
1716 rc = __map_request(osdc, req, 0);
1717 if (rc < 0) {
1718 if (nofail) {
1719 dout("osdc_start_request failed map, "
1720 " will retry %lld\n", req->r_tid);
1721 rc = 0;
1722 }
1723 goto out_unlock;
1724 }
1725 if (req->r_osd == NULL) {
1726 dout("send_request %p no up osds in pg\n", req);
1727 ceph_monc_request_next_osdmap(&osdc->client->monc);
1728 } else {
1729 rc = __send_request(osdc, req);
1730 if (rc) {
1731 if (nofail) {
1732 dout("osdc_start_request failed send, "
1733 " will retry %lld\n", req->r_tid);
1734 rc = 0;
1735 } else {
1736 __unregister_request(osdc, req);
1737 }
1738 }
1739 }
1740 }
1741
1742 out_unlock:
1743 mutex_unlock(&osdc->request_mutex);
1744 up_read(&osdc->map_sem);
1745 return rc;
1746 }
1747 EXPORT_SYMBOL(ceph_osdc_start_request);
1748
1749 /*
1750 * wait for a request to complete
1751 */
1752 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1753 struct ceph_osd_request *req)
1754 {
1755 int rc;
1756
1757 rc = wait_for_completion_interruptible(&req->r_completion);
1758 if (rc < 0) {
1759 mutex_lock(&osdc->request_mutex);
1760 __cancel_request(req);
1761 __unregister_request(osdc, req);
1762 mutex_unlock(&osdc->request_mutex);
1763 complete_request(req);
1764 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1765 return rc;
1766 }
1767
1768 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1769 return req->r_result;
1770 }
1771 EXPORT_SYMBOL(ceph_osdc_wait_request);
1772
1773 /*
1774 * sync - wait for all in-flight requests to flush. avoid starvation.
1775 */
1776 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1777 {
1778 struct ceph_osd_request *req;
1779 u64 last_tid, next_tid = 0;
1780
1781 mutex_lock(&osdc->request_mutex);
1782 last_tid = osdc->last_tid;
1783 while (1) {
1784 req = __lookup_request_ge(osdc, next_tid);
1785 if (!req)
1786 break;
1787 if (req->r_tid > last_tid)
1788 break;
1789
1790 next_tid = req->r_tid + 1;
1791 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1792 continue;
1793
1794 ceph_osdc_get_request(req);
1795 mutex_unlock(&osdc->request_mutex);
1796 dout("sync waiting on tid %llu (last is %llu)\n",
1797 req->r_tid, last_tid);
1798 wait_for_completion(&req->r_safe_completion);
1799 mutex_lock(&osdc->request_mutex);
1800 ceph_osdc_put_request(req);
1801 }
1802 mutex_unlock(&osdc->request_mutex);
1803 dout("sync done (thru tid %llu)\n", last_tid);
1804 }
1805 EXPORT_SYMBOL(ceph_osdc_sync);
1806
1807 /*
1808 * init, shutdown
1809 */
1810 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1811 {
1812 int err;
1813
1814 dout("init\n");
1815 osdc->client = client;
1816 osdc->osdmap = NULL;
1817 init_rwsem(&osdc->map_sem);
1818 init_completion(&osdc->map_waiters);
1819 osdc->last_requested_map = 0;
1820 mutex_init(&osdc->request_mutex);
1821 osdc->last_tid = 0;
1822 osdc->osds = RB_ROOT;
1823 INIT_LIST_HEAD(&osdc->osd_lru);
1824 osdc->requests = RB_ROOT;
1825 INIT_LIST_HEAD(&osdc->req_lru);
1826 INIT_LIST_HEAD(&osdc->req_unsent);
1827 INIT_LIST_HEAD(&osdc->req_notarget);
1828 INIT_LIST_HEAD(&osdc->req_linger);
1829 osdc->num_requests = 0;
1830 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1831 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1832 spin_lock_init(&osdc->event_lock);
1833 osdc->event_tree = RB_ROOT;
1834 osdc->event_count = 0;
1835
1836 schedule_delayed_work(&osdc->osds_timeout_work,
1837 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1838
1839 err = -ENOMEM;
1840 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1841 sizeof(struct ceph_osd_request));
1842 if (!osdc->req_mempool)
1843 goto out;
1844
1845 err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1846 "osd_op");
1847 if (err < 0)
1848 goto out_mempool;
1849 err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1850 OSD_OPREPLY_FRONT_LEN, 10, true,
1851 "osd_op_reply");
1852 if (err < 0)
1853 goto out_msgpool;
1854
1855 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1856 if (IS_ERR(osdc->notify_wq)) {
1857 err = PTR_ERR(osdc->notify_wq);
1858 osdc->notify_wq = NULL;
1859 goto out_msgpool;
1860 }
1861 return 0;
1862
1863 out_msgpool:
1864 ceph_msgpool_destroy(&osdc->msgpool_op);
1865 out_mempool:
1866 mempool_destroy(osdc->req_mempool);
1867 out:
1868 return err;
1869 }
1870 EXPORT_SYMBOL(ceph_osdc_init);
1871
1872 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1873 {
1874 flush_workqueue(osdc->notify_wq);
1875 destroy_workqueue(osdc->notify_wq);
1876 cancel_delayed_work_sync(&osdc->timeout_work);
1877 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1878 if (osdc->osdmap) {
1879 ceph_osdmap_destroy(osdc->osdmap);
1880 osdc->osdmap = NULL;
1881 }
1882 remove_all_osds(osdc);
1883 mempool_destroy(osdc->req_mempool);
1884 ceph_msgpool_destroy(&osdc->msgpool_op);
1885 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1886 }
1887 EXPORT_SYMBOL(ceph_osdc_stop);
1888
1889 /*
1890 * Read some contiguous pages. If we cross a stripe boundary, shorten
1891 * *plen. Return number of bytes read, or error.
1892 */
1893 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1894 struct ceph_vino vino, struct ceph_file_layout *layout,
1895 u64 off, u64 *plen,
1896 u32 truncate_seq, u64 truncate_size,
1897 struct page **pages, int num_pages, int page_align)
1898 {
1899 struct ceph_osd_request *req;
1900 int rc = 0;
1901
1902 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1903 vino.snap, off, *plen);
1904 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1905 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1906 NULL, 0, truncate_seq, truncate_size, NULL,
1907 false, 1, page_align);
1908 if (!req)
1909 return -ENOMEM;
1910
1911 /* it may be a short read due to an object boundary */
1912 req->r_pages = pages;
1913
1914 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1915 off, *plen, req->r_num_pages, page_align);
1916
1917 rc = ceph_osdc_start_request(osdc, req, false);
1918 if (!rc)
1919 rc = ceph_osdc_wait_request(osdc, req);
1920
1921 ceph_osdc_put_request(req);
1922 dout("readpages result %d\n", rc);
1923 return rc;
1924 }
1925 EXPORT_SYMBOL(ceph_osdc_readpages);
1926
1927 /*
1928 * do a synchronous write on N pages
1929 */
1930 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1931 struct ceph_file_layout *layout,
1932 struct ceph_snap_context *snapc,
1933 u64 off, u64 len,
1934 u32 truncate_seq, u64 truncate_size,
1935 struct timespec *mtime,
1936 struct page **pages, int num_pages,
1937 int flags, int do_sync, bool nofail)
1938 {
1939 struct ceph_osd_request *req;
1940 int rc = 0;
1941 int page_align = off & ~PAGE_MASK;
1942
1943 BUG_ON(vino.snap != CEPH_NOSNAP);
1944 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1945 CEPH_OSD_OP_WRITE,
1946 flags | CEPH_OSD_FLAG_ONDISK |
1947 CEPH_OSD_FLAG_WRITE,
1948 snapc, do_sync,
1949 truncate_seq, truncate_size, mtime,
1950 nofail, 1, page_align);
1951 if (!req)
1952 return -ENOMEM;
1953
1954 /* it may be a short write due to an object boundary */
1955 req->r_pages = pages;
1956 dout("writepages %llu~%llu (%d pages)\n", off, len,
1957 req->r_num_pages);
1958
1959 rc = ceph_osdc_start_request(osdc, req, nofail);
1960 if (!rc)
1961 rc = ceph_osdc_wait_request(osdc, req);
1962
1963 ceph_osdc_put_request(req);
1964 if (rc == 0)
1965 rc = len;
1966 dout("writepages result %d\n", rc);
1967 return rc;
1968 }
1969 EXPORT_SYMBOL(ceph_osdc_writepages);
1970
1971 /*
1972 * handle incoming message
1973 */
1974 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1975 {
1976 struct ceph_osd *osd = con->private;
1977 struct ceph_osd_client *osdc;
1978 int type = le16_to_cpu(msg->hdr.type);
1979
1980 if (!osd)
1981 goto out;
1982 osdc = osd->o_osdc;
1983
1984 switch (type) {
1985 case CEPH_MSG_OSD_MAP:
1986 ceph_osdc_handle_map(osdc, msg);
1987 break;
1988 case CEPH_MSG_OSD_OPREPLY:
1989 handle_reply(osdc, msg, con);
1990 break;
1991 case CEPH_MSG_WATCH_NOTIFY:
1992 handle_watch_notify(osdc, msg);
1993 break;
1994
1995 default:
1996 pr_err("received unknown message type %d %s\n", type,
1997 ceph_msg_type_name(type));
1998 }
1999 out:
2000 ceph_msg_put(msg);
2001 }
2002
2003 /*
2004 * lookup and return message for incoming reply. set up reply message
2005 * pages.
2006 */
2007 static struct ceph_msg *get_reply(struct ceph_connection *con,
2008 struct ceph_msg_header *hdr,
2009 int *skip)
2010 {
2011 struct ceph_osd *osd = con->private;
2012 struct ceph_osd_client *osdc = osd->o_osdc;
2013 struct ceph_msg *m;
2014 struct ceph_osd_request *req;
2015 int front = le32_to_cpu(hdr->front_len);
2016 int data_len = le32_to_cpu(hdr->data_len);
2017 u64 tid;
2018
2019 tid = le64_to_cpu(hdr->tid);
2020 mutex_lock(&osdc->request_mutex);
2021 req = __lookup_request(osdc, tid);
2022 if (!req) {
2023 *skip = 1;
2024 m = NULL;
2025 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2026 osd->o_osd);
2027 goto out;
2028 }
2029
2030 if (req->r_con_filling_msg) {
2031 dout("get_reply revoking msg %p from old con %p\n",
2032 req->r_reply, req->r_con_filling_msg);
2033 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2034 ceph_con_put(req->r_con_filling_msg);
2035 req->r_con_filling_msg = NULL;
2036 }
2037
2038 if (front > req->r_reply->front.iov_len) {
2039 pr_warning("get_reply front %d > preallocated %d\n",
2040 front, (int)req->r_reply->front.iov_len);
2041 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2042 if (!m)
2043 goto out;
2044 ceph_msg_put(req->r_reply);
2045 req->r_reply = m;
2046 }
2047 m = ceph_msg_get(req->r_reply);
2048
2049 if (data_len > 0) {
2050 int want = calc_pages_for(req->r_page_alignment, data_len);
2051
2052 if (unlikely(req->r_num_pages < want)) {
2053 pr_warning("tid %lld reply has %d bytes %d pages, we"
2054 " had only %d pages ready\n", tid, data_len,
2055 want, req->r_num_pages);
2056 *skip = 1;
2057 ceph_msg_put(m);
2058 m = NULL;
2059 goto out;
2060 }
2061 m->pages = req->r_pages;
2062 m->nr_pages = req->r_num_pages;
2063 m->page_alignment = req->r_page_alignment;
2064 #ifdef CONFIG_BLOCK
2065 m->bio = req->r_bio;
2066 #endif
2067 }
2068 *skip = 0;
2069 req->r_con_filling_msg = ceph_con_get(con);
2070 dout("get_reply tid %lld %p\n", tid, m);
2071
2072 out:
2073 mutex_unlock(&osdc->request_mutex);
2074 return m;
2075
2076 }
2077
2078 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2079 struct ceph_msg_header *hdr,
2080 int *skip)
2081 {
2082 struct ceph_osd *osd = con->private;
2083 int type = le16_to_cpu(hdr->type);
2084 int front = le32_to_cpu(hdr->front_len);
2085
2086 switch (type) {
2087 case CEPH_MSG_OSD_MAP:
2088 case CEPH_MSG_WATCH_NOTIFY:
2089 return ceph_msg_new(type, front, GFP_NOFS, false);
2090 case CEPH_MSG_OSD_OPREPLY:
2091 return get_reply(con, hdr, skip);
2092 default:
2093 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2094 osd->o_osd);
2095 *skip = 1;
2096 return NULL;
2097 }
2098 }
2099
2100 /*
2101 * Wrappers to refcount containing ceph_osd struct
2102 */
2103 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2104 {
2105 struct ceph_osd *osd = con->private;
2106 if (get_osd(osd))
2107 return con;
2108 return NULL;
2109 }
2110
2111 static void put_osd_con(struct ceph_connection *con)
2112 {
2113 struct ceph_osd *osd = con->private;
2114 put_osd(osd);
2115 }
2116
2117 /*
2118 * authentication
2119 */
2120 static int get_authorizer(struct ceph_connection *con,
2121 void **buf, int *len, int *proto,
2122 void **reply_buf, int *reply_len, int force_new)
2123 {
2124 struct ceph_osd *o = con->private;
2125 struct ceph_osd_client *osdc = o->o_osdc;
2126 struct ceph_auth_client *ac = osdc->client->monc.auth;
2127 int ret = 0;
2128
2129 if (force_new && o->o_authorizer) {
2130 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2131 o->o_authorizer = NULL;
2132 }
2133 if (o->o_authorizer == NULL) {
2134 ret = ac->ops->create_authorizer(
2135 ac, CEPH_ENTITY_TYPE_OSD,
2136 &o->o_authorizer,
2137 &o->o_authorizer_buf,
2138 &o->o_authorizer_buf_len,
2139 &o->o_authorizer_reply_buf,
2140 &o->o_authorizer_reply_buf_len);
2141 if (ret)
2142 return ret;
2143 }
2144
2145 *proto = ac->protocol;
2146 *buf = o->o_authorizer_buf;
2147 *len = o->o_authorizer_buf_len;
2148 *reply_buf = o->o_authorizer_reply_buf;
2149 *reply_len = o->o_authorizer_reply_buf_len;
2150 return 0;
2151 }
2152
2153
2154 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2155 {
2156 struct ceph_osd *o = con->private;
2157 struct ceph_osd_client *osdc = o->o_osdc;
2158 struct ceph_auth_client *ac = osdc->client->monc.auth;
2159
2160 return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2161 }
2162
2163 static int invalidate_authorizer(struct ceph_connection *con)
2164 {
2165 struct ceph_osd *o = con->private;
2166 struct ceph_osd_client *osdc = o->o_osdc;
2167 struct ceph_auth_client *ac = osdc->client->monc.auth;
2168
2169 if (ac->ops->invalidate_authorizer)
2170 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2171
2172 return ceph_monc_validate_auth(&osdc->client->monc);
2173 }
2174
2175 static const struct ceph_connection_operations osd_con_ops = {
2176 .get = get_osd_con,
2177 .put = put_osd_con,
2178 .dispatch = dispatch,
2179 .get_authorizer = get_authorizer,
2180 .verify_authorizer_reply = verify_authorizer_reply,
2181 .invalidate_authorizer = invalidate_authorizer,
2182 .alloc_msg = alloc_msg,
2183 .fault = osd_reset,
2184 };
Linus' kernel tree