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