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Merge branches 'delete-gts-bfs', 'misc', 'novell-bugzilla-757888-numa' and 'osc-pcie...
[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 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_con_filling_msg) {
143 dout("%s revoking pages %p from con %p\n", __func__,
144 req->r_pages, req->r_con_filling_msg);
145 ceph_msg_revoke_incoming(req->r_reply);
146 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
147 }
148 if (req->r_reply)
149 ceph_msg_put(req->r_reply);
150 if (req->r_own_pages)
151 ceph_release_page_vector(req->r_pages,
152 req->r_num_pages);
153 #ifdef CONFIG_BLOCK
154 if (req->r_bio)
155 bio_put(req->r_bio);
156 #endif
157 ceph_put_snap_context(req->r_snapc);
158 if (req->r_trail) {
159 ceph_pagelist_release(req->r_trail);
160 kfree(req->r_trail);
161 }
162 if (req->r_mempool)
163 mempool_free(req, req->r_osdc->req_mempool);
164 else
165 kfree(req);
166 }
167 EXPORT_SYMBOL(ceph_osdc_release_request);
168
169 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
170 {
171 int i = 0;
172
173 if (needs_trail)
174 *needs_trail = 0;
175 while (ops[i].op) {
176 if (needs_trail && op_needs_trail(ops[i].op))
177 *needs_trail = 1;
178 i++;
179 }
180
181 return i;
182 }
183
184 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
185 int flags,
186 struct ceph_snap_context *snapc,
187 struct ceph_osd_req_op *ops,
188 bool use_mempool,
189 gfp_t gfp_flags,
190 struct page **pages,
191 struct bio *bio)
192 {
193 struct ceph_osd_request *req;
194 struct ceph_msg *msg;
195 int needs_trail;
196 int num_op = get_num_ops(ops, &needs_trail);
197 size_t msg_size = sizeof(struct ceph_osd_request_head);
198
199 msg_size += num_op*sizeof(struct ceph_osd_op);
200
201 if (use_mempool) {
202 req = mempool_alloc(osdc->req_mempool, gfp_flags);
203 memset(req, 0, sizeof(*req));
204 } else {
205 req = kzalloc(sizeof(*req), gfp_flags);
206 }
207 if (req == NULL)
208 return NULL;
209
210 req->r_osdc = osdc;
211 req->r_mempool = use_mempool;
212
213 kref_init(&req->r_kref);
214 init_completion(&req->r_completion);
215 init_completion(&req->r_safe_completion);
216 rb_init_node(&req->r_node);
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 INIT_LIST_HEAD(&req->r_osd_item);
222
223 req->r_flags = flags;
224
225 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
226
227 /* create reply message */
228 if (use_mempool)
229 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
230 else
231 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
232 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
233 if (!msg) {
234 ceph_osdc_put_request(req);
235 return NULL;
236 }
237 req->r_reply = msg;
238
239 /* allocate space for the trailing data */
240 if (needs_trail) {
241 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
242 if (!req->r_trail) {
243 ceph_osdc_put_request(req);
244 return NULL;
245 }
246 ceph_pagelist_init(req->r_trail);
247 }
248
249 /* create request message; allow space for oid */
250 msg_size += MAX_OBJ_NAME_SIZE;
251 if (snapc)
252 msg_size += sizeof(u64) * snapc->num_snaps;
253 if (use_mempool)
254 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
255 else
256 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
257 if (!msg) {
258 ceph_osdc_put_request(req);
259 return NULL;
260 }
261
262 memset(msg->front.iov_base, 0, msg->front.iov_len);
263
264 req->r_request = msg;
265 req->r_pages = pages;
266 #ifdef CONFIG_BLOCK
267 if (bio) {
268 req->r_bio = bio;
269 bio_get(req->r_bio);
270 }
271 #endif
272
273 return req;
274 }
275 EXPORT_SYMBOL(ceph_osdc_alloc_request);
276
277 static void osd_req_encode_op(struct ceph_osd_request *req,
278 struct ceph_osd_op *dst,
279 struct ceph_osd_req_op *src)
280 {
281 dst->op = cpu_to_le16(src->op);
282
283 switch (src->op) {
284 case CEPH_OSD_OP_READ:
285 case CEPH_OSD_OP_WRITE:
286 dst->extent.offset =
287 cpu_to_le64(src->extent.offset);
288 dst->extent.length =
289 cpu_to_le64(src->extent.length);
290 dst->extent.truncate_size =
291 cpu_to_le64(src->extent.truncate_size);
292 dst->extent.truncate_seq =
293 cpu_to_le32(src->extent.truncate_seq);
294 break;
295
296 case CEPH_OSD_OP_GETXATTR:
297 case CEPH_OSD_OP_SETXATTR:
298 case CEPH_OSD_OP_CMPXATTR:
299 BUG_ON(!req->r_trail);
300
301 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
302 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
303 dst->xattr.cmp_op = src->xattr.cmp_op;
304 dst->xattr.cmp_mode = src->xattr.cmp_mode;
305 ceph_pagelist_append(req->r_trail, src->xattr.name,
306 src->xattr.name_len);
307 ceph_pagelist_append(req->r_trail, src->xattr.val,
308 src->xattr.value_len);
309 break;
310 case CEPH_OSD_OP_CALL:
311 BUG_ON(!req->r_trail);
312
313 dst->cls.class_len = src->cls.class_len;
314 dst->cls.method_len = src->cls.method_len;
315 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
316
317 ceph_pagelist_append(req->r_trail, src->cls.class_name,
318 src->cls.class_len);
319 ceph_pagelist_append(req->r_trail, src->cls.method_name,
320 src->cls.method_len);
321 ceph_pagelist_append(req->r_trail, src->cls.indata,
322 src->cls.indata_len);
323 break;
324 case CEPH_OSD_OP_ROLLBACK:
325 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
326 break;
327 case CEPH_OSD_OP_STARTSYNC:
328 break;
329 case CEPH_OSD_OP_NOTIFY:
330 {
331 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
332 __le32 timeout = cpu_to_le32(src->watch.timeout);
333
334 BUG_ON(!req->r_trail);
335
336 ceph_pagelist_append(req->r_trail,
337 &prot_ver, sizeof(prot_ver));
338 ceph_pagelist_append(req->r_trail,
339 &timeout, sizeof(timeout));
340 }
341 case CEPH_OSD_OP_NOTIFY_ACK:
342 case CEPH_OSD_OP_WATCH:
343 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
344 dst->watch.ver = cpu_to_le64(src->watch.ver);
345 dst->watch.flag = src->watch.flag;
346 break;
347 default:
348 pr_err("unrecognized osd opcode %d\n", dst->op);
349 WARN_ON(1);
350 break;
351 }
352 dst->payload_len = cpu_to_le32(src->payload_len);
353 }
354
355 /*
356 * build new request AND message
357 *
358 */
359 void ceph_osdc_build_request(struct ceph_osd_request *req,
360 u64 off, u64 *plen,
361 struct ceph_osd_req_op *src_ops,
362 struct ceph_snap_context *snapc,
363 struct timespec *mtime,
364 const char *oid,
365 int oid_len)
366 {
367 struct ceph_msg *msg = req->r_request;
368 struct ceph_osd_request_head *head;
369 struct ceph_osd_req_op *src_op;
370 struct ceph_osd_op *op;
371 void *p;
372 int num_op = get_num_ops(src_ops, NULL);
373 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
374 int flags = req->r_flags;
375 u64 data_len = 0;
376 int i;
377
378 head = msg->front.iov_base;
379 op = (void *)(head + 1);
380 p = (void *)(op + num_op);
381
382 req->r_snapc = ceph_get_snap_context(snapc);
383
384 head->client_inc = cpu_to_le32(1); /* always, for now. */
385 head->flags = cpu_to_le32(flags);
386 if (flags & CEPH_OSD_FLAG_WRITE)
387 ceph_encode_timespec(&head->mtime, mtime);
388 head->num_ops = cpu_to_le16(num_op);
389
390
391 /* fill in oid */
392 head->object_len = cpu_to_le32(oid_len);
393 memcpy(p, oid, oid_len);
394 p += oid_len;
395
396 src_op = src_ops;
397 while (src_op->op) {
398 osd_req_encode_op(req, op, src_op);
399 src_op++;
400 op++;
401 }
402
403 if (req->r_trail)
404 data_len += req->r_trail->length;
405
406 if (snapc) {
407 head->snap_seq = cpu_to_le64(snapc->seq);
408 head->num_snaps = cpu_to_le32(snapc->num_snaps);
409 for (i = 0; i < snapc->num_snaps; i++) {
410 put_unaligned_le64(snapc->snaps[i], p);
411 p += sizeof(u64);
412 }
413 }
414
415 if (flags & CEPH_OSD_FLAG_WRITE) {
416 req->r_request->hdr.data_off = cpu_to_le16(off);
417 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
418 } else if (data_len) {
419 req->r_request->hdr.data_off = 0;
420 req->r_request->hdr.data_len = cpu_to_le32(data_len);
421 }
422
423 req->r_request->page_alignment = req->r_page_alignment;
424
425 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
426 msg_size = p - msg->front.iov_base;
427 msg->front.iov_len = msg_size;
428 msg->hdr.front_len = cpu_to_le32(msg_size);
429 return;
430 }
431 EXPORT_SYMBOL(ceph_osdc_build_request);
432
433 /*
434 * build new request AND message, calculate layout, and adjust file
435 * extent as needed.
436 *
437 * if the file was recently truncated, we include information about its
438 * old and new size so that the object can be updated appropriately. (we
439 * avoid synchronously deleting truncated objects because it's slow.)
440 *
441 * if @do_sync, include a 'startsync' command so that the osd will flush
442 * data quickly.
443 */
444 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
445 struct ceph_file_layout *layout,
446 struct ceph_vino vino,
447 u64 off, u64 *plen,
448 int opcode, int flags,
449 struct ceph_snap_context *snapc,
450 int do_sync,
451 u32 truncate_seq,
452 u64 truncate_size,
453 struct timespec *mtime,
454 bool use_mempool, int num_reply,
455 int page_align)
456 {
457 struct ceph_osd_req_op ops[3];
458 struct ceph_osd_request *req;
459
460 ops[0].op = opcode;
461 ops[0].extent.truncate_seq = truncate_seq;
462 ops[0].extent.truncate_size = truncate_size;
463 ops[0].payload_len = 0;
464
465 if (do_sync) {
466 ops[1].op = CEPH_OSD_OP_STARTSYNC;
467 ops[1].payload_len = 0;
468 ops[2].op = 0;
469 } else
470 ops[1].op = 0;
471
472 req = ceph_osdc_alloc_request(osdc, flags,
473 snapc, ops,
474 use_mempool,
475 GFP_NOFS, NULL, NULL);
476 if (!req)
477 return NULL;
478
479 /* calculate max write size */
480 calc_layout(osdc, vino, layout, off, plen, req, ops);
481 req->r_file_layout = *layout; /* keep a copy */
482
483 /* in case it differs from natural (file) alignment that
484 calc_layout filled in for us */
485 req->r_num_pages = calc_pages_for(page_align, *plen);
486 req->r_page_alignment = page_align;
487
488 ceph_osdc_build_request(req, off, plen, ops,
489 snapc,
490 mtime,
491 req->r_oid, req->r_oid_len);
492
493 return req;
494 }
495 EXPORT_SYMBOL(ceph_osdc_new_request);
496
497 /*
498 * We keep osd requests in an rbtree, sorted by ->r_tid.
499 */
500 static void __insert_request(struct ceph_osd_client *osdc,
501 struct ceph_osd_request *new)
502 {
503 struct rb_node **p = &osdc->requests.rb_node;
504 struct rb_node *parent = NULL;
505 struct ceph_osd_request *req = NULL;
506
507 while (*p) {
508 parent = *p;
509 req = rb_entry(parent, struct ceph_osd_request, r_node);
510 if (new->r_tid < req->r_tid)
511 p = &(*p)->rb_left;
512 else if (new->r_tid > req->r_tid)
513 p = &(*p)->rb_right;
514 else
515 BUG();
516 }
517
518 rb_link_node(&new->r_node, parent, p);
519 rb_insert_color(&new->r_node, &osdc->requests);
520 }
521
522 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
523 u64 tid)
524 {
525 struct ceph_osd_request *req;
526 struct rb_node *n = osdc->requests.rb_node;
527
528 while (n) {
529 req = rb_entry(n, struct ceph_osd_request, r_node);
530 if (tid < req->r_tid)
531 n = n->rb_left;
532 else if (tid > req->r_tid)
533 n = n->rb_right;
534 else
535 return req;
536 }
537 return NULL;
538 }
539
540 static struct ceph_osd_request *
541 __lookup_request_ge(struct ceph_osd_client *osdc,
542 u64 tid)
543 {
544 struct ceph_osd_request *req;
545 struct rb_node *n = osdc->requests.rb_node;
546
547 while (n) {
548 req = rb_entry(n, struct ceph_osd_request, r_node);
549 if (tid < req->r_tid) {
550 if (!n->rb_left)
551 return req;
552 n = n->rb_left;
553 } else if (tid > req->r_tid) {
554 n = n->rb_right;
555 } else {
556 return req;
557 }
558 }
559 return NULL;
560 }
561
562 /*
563 * Resubmit requests pending on the given osd.
564 */
565 static void __kick_osd_requests(struct ceph_osd_client *osdc,
566 struct ceph_osd *osd)
567 {
568 struct ceph_osd_request *req, *nreq;
569 int err;
570
571 dout("__kick_osd_requests osd%d\n", osd->o_osd);
572 err = __reset_osd(osdc, osd);
573 if (err == -EAGAIN)
574 return;
575
576 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
577 list_move(&req->r_req_lru_item, &osdc->req_unsent);
578 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
579 osd->o_osd);
580 if (!req->r_linger)
581 req->r_flags |= CEPH_OSD_FLAG_RETRY;
582 }
583
584 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
585 r_linger_osd) {
586 /*
587 * reregister request prior to unregistering linger so
588 * that r_osd is preserved.
589 */
590 BUG_ON(!list_empty(&req->r_req_lru_item));
591 __register_request(osdc, req);
592 list_add(&req->r_req_lru_item, &osdc->req_unsent);
593 list_add(&req->r_osd_item, &req->r_osd->o_requests);
594 __unregister_linger_request(osdc, req);
595 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
596 osd->o_osd);
597 }
598 }
599
600 static void kick_osd_requests(struct ceph_osd_client *osdc,
601 struct ceph_osd *kickosd)
602 {
603 mutex_lock(&osdc->request_mutex);
604 __kick_osd_requests(osdc, kickosd);
605 mutex_unlock(&osdc->request_mutex);
606 }
607
608 /*
609 * If the osd connection drops, we need to resubmit all requests.
610 */
611 static void osd_reset(struct ceph_connection *con)
612 {
613 struct ceph_osd *osd = con->private;
614 struct ceph_osd_client *osdc;
615
616 if (!osd)
617 return;
618 dout("osd_reset osd%d\n", osd->o_osd);
619 osdc = osd->o_osdc;
620 down_read(&osdc->map_sem);
621 kick_osd_requests(osdc, osd);
622 send_queued(osdc);
623 up_read(&osdc->map_sem);
624 }
625
626 /*
627 * Track open sessions with osds.
628 */
629 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
630 {
631 struct ceph_osd *osd;
632
633 osd = kzalloc(sizeof(*osd), GFP_NOFS);
634 if (!osd)
635 return NULL;
636
637 atomic_set(&osd->o_ref, 1);
638 osd->o_osdc = osdc;
639 osd->o_osd = onum;
640 INIT_LIST_HEAD(&osd->o_requests);
641 INIT_LIST_HEAD(&osd->o_linger_requests);
642 INIT_LIST_HEAD(&osd->o_osd_lru);
643 osd->o_incarnation = 1;
644
645 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
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) && osd->o_auth.authorizer) {
668 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
669
670 if (ac->ops && ac->ops->destroy_authorizer)
671 ac->ops->destroy_authorizer(ac, osd->o_auth.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("%s %p\n", __func__, 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, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
756 &osdc->osdmap->osd_addr[osd->o_osd]);
757 osd->o_incarnation++;
758 }
759 return ret;
760 }
761
762 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
763 {
764 struct rb_node **p = &osdc->osds.rb_node;
765 struct rb_node *parent = NULL;
766 struct ceph_osd *osd = NULL;
767
768 dout("__insert_osd %p osd%d\n", new, new->o_osd);
769 while (*p) {
770 parent = *p;
771 osd = rb_entry(parent, struct ceph_osd, o_node);
772 if (new->o_osd < osd->o_osd)
773 p = &(*p)->rb_left;
774 else if (new->o_osd > osd->o_osd)
775 p = &(*p)->rb_right;
776 else
777 BUG();
778 }
779
780 rb_link_node(&new->o_node, parent, p);
781 rb_insert_color(&new->o_node, &osdc->osds);
782 }
783
784 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
785 {
786 struct ceph_osd *osd;
787 struct rb_node *n = osdc->osds.rb_node;
788
789 while (n) {
790 osd = rb_entry(n, struct ceph_osd, o_node);
791 if (o < osd->o_osd)
792 n = n->rb_left;
793 else if (o > osd->o_osd)
794 n = n->rb_right;
795 else
796 return osd;
797 }
798 return NULL;
799 }
800
801 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
802 {
803 schedule_delayed_work(&osdc->timeout_work,
804 osdc->client->options->osd_keepalive_timeout * HZ);
805 }
806
807 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
808 {
809 cancel_delayed_work(&osdc->timeout_work);
810 }
811
812 /*
813 * Register request, assign tid. If this is the first request, set up
814 * the timeout event.
815 */
816 static void __register_request(struct ceph_osd_client *osdc,
817 struct ceph_osd_request *req)
818 {
819 req->r_tid = ++osdc->last_tid;
820 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
821 dout("__register_request %p tid %lld\n", req, req->r_tid);
822 __insert_request(osdc, req);
823 ceph_osdc_get_request(req);
824 osdc->num_requests++;
825 if (osdc->num_requests == 1) {
826 dout(" first request, scheduling timeout\n");
827 __schedule_osd_timeout(osdc);
828 }
829 }
830
831 static void register_request(struct ceph_osd_client *osdc,
832 struct ceph_osd_request *req)
833 {
834 mutex_lock(&osdc->request_mutex);
835 __register_request(osdc, req);
836 mutex_unlock(&osdc->request_mutex);
837 }
838
839 /*
840 * called under osdc->request_mutex
841 */
842 static void __unregister_request(struct ceph_osd_client *osdc,
843 struct ceph_osd_request *req)
844 {
845 if (RB_EMPTY_NODE(&req->r_node)) {
846 dout("__unregister_request %p tid %lld not registered\n",
847 req, req->r_tid);
848 return;
849 }
850
851 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
852 rb_erase(&req->r_node, &osdc->requests);
853 osdc->num_requests--;
854
855 if (req->r_osd) {
856 /* make sure the original request isn't in flight. */
857 ceph_msg_revoke(req->r_request);
858
859 list_del_init(&req->r_osd_item);
860 if (list_empty(&req->r_osd->o_requests) &&
861 list_empty(&req->r_osd->o_linger_requests)) {
862 dout("moving osd to %p lru\n", req->r_osd);
863 __move_osd_to_lru(osdc, req->r_osd);
864 }
865 if (list_empty(&req->r_linger_item))
866 req->r_osd = NULL;
867 }
868
869 ceph_osdc_put_request(req);
870
871 list_del_init(&req->r_req_lru_item);
872 if (osdc->num_requests == 0) {
873 dout(" no requests, canceling timeout\n");
874 __cancel_osd_timeout(osdc);
875 }
876 }
877
878 /*
879 * Cancel a previously queued request message
880 */
881 static void __cancel_request(struct ceph_osd_request *req)
882 {
883 if (req->r_sent && req->r_osd) {
884 ceph_msg_revoke(req->r_request);
885 req->r_sent = 0;
886 }
887 }
888
889 static void __register_linger_request(struct ceph_osd_client *osdc,
890 struct ceph_osd_request *req)
891 {
892 dout("__register_linger_request %p\n", req);
893 list_add_tail(&req->r_linger_item, &osdc->req_linger);
894 if (req->r_osd)
895 list_add_tail(&req->r_linger_osd,
896 &req->r_osd->o_linger_requests);
897 }
898
899 static void __unregister_linger_request(struct ceph_osd_client *osdc,
900 struct ceph_osd_request *req)
901 {
902 dout("__unregister_linger_request %p\n", req);
903 if (req->r_osd) {
904 list_del_init(&req->r_linger_item);
905 list_del_init(&req->r_linger_osd);
906
907 if (list_empty(&req->r_osd->o_requests) &&
908 list_empty(&req->r_osd->o_linger_requests)) {
909 dout("moving osd to %p lru\n", req->r_osd);
910 __move_osd_to_lru(osdc, req->r_osd);
911 }
912 if (list_empty(&req->r_osd_item))
913 req->r_osd = NULL;
914 }
915 }
916
917 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
918 struct ceph_osd_request *req)
919 {
920 mutex_lock(&osdc->request_mutex);
921 if (req->r_linger) {
922 __unregister_linger_request(osdc, req);
923 ceph_osdc_put_request(req);
924 }
925 mutex_unlock(&osdc->request_mutex);
926 }
927 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
928
929 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
930 struct ceph_osd_request *req)
931 {
932 if (!req->r_linger) {
933 dout("set_request_linger %p\n", req);
934 req->r_linger = 1;
935 /*
936 * caller is now responsible for calling
937 * unregister_linger_request
938 */
939 ceph_osdc_get_request(req);
940 }
941 }
942 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
943
944 /*
945 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
946 * (as needed), and set the request r_osd appropriately. If there is
947 * no up osd, set r_osd to NULL. Move the request to the appropriate list
948 * (unsent, homeless) or leave on in-flight lru.
949 *
950 * Return 0 if unchanged, 1 if changed, or negative on error.
951 *
952 * Caller should hold map_sem for read and request_mutex.
953 */
954 static int __map_request(struct ceph_osd_client *osdc,
955 struct ceph_osd_request *req, int force_resend)
956 {
957 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
958 struct ceph_pg pgid;
959 int acting[CEPH_PG_MAX_SIZE];
960 int o = -1, num = 0;
961 int err;
962
963 dout("map_request %p tid %lld\n", req, req->r_tid);
964 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
965 &req->r_file_layout, osdc->osdmap);
966 if (err) {
967 list_move(&req->r_req_lru_item, &osdc->req_notarget);
968 return err;
969 }
970 pgid = reqhead->layout.ol_pgid;
971 req->r_pgid = pgid;
972
973 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
974 if (err > 0) {
975 o = acting[0];
976 num = err;
977 }
978
979 if ((!force_resend &&
980 req->r_osd && req->r_osd->o_osd == o &&
981 req->r_sent >= req->r_osd->o_incarnation &&
982 req->r_num_pg_osds == num &&
983 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
984 (req->r_osd == NULL && o == -1))
985 return 0; /* no change */
986
987 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
988 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
989 req->r_osd ? req->r_osd->o_osd : -1);
990
991 /* record full pg acting set */
992 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
993 req->r_num_pg_osds = num;
994
995 if (req->r_osd) {
996 __cancel_request(req);
997 list_del_init(&req->r_osd_item);
998 req->r_osd = NULL;
999 }
1000
1001 req->r_osd = __lookup_osd(osdc, o);
1002 if (!req->r_osd && o >= 0) {
1003 err = -ENOMEM;
1004 req->r_osd = create_osd(osdc, o);
1005 if (!req->r_osd) {
1006 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1007 goto out;
1008 }
1009
1010 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1011 __insert_osd(osdc, req->r_osd);
1012
1013 ceph_con_open(&req->r_osd->o_con,
1014 CEPH_ENTITY_TYPE_OSD, o,
1015 &osdc->osdmap->osd_addr[o]);
1016 }
1017
1018 if (req->r_osd) {
1019 __remove_osd_from_lru(req->r_osd);
1020 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1021 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1022 } else {
1023 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1024 }
1025 err = 1; /* osd or pg changed */
1026
1027 out:
1028 return err;
1029 }
1030
1031 /*
1032 * caller should hold map_sem (for read) and request_mutex
1033 */
1034 static void __send_request(struct ceph_osd_client *osdc,
1035 struct ceph_osd_request *req)
1036 {
1037 struct ceph_osd_request_head *reqhead;
1038
1039 dout("send_request %p tid %llu to osd%d flags %d\n",
1040 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1041
1042 reqhead = req->r_request->front.iov_base;
1043 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1044 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1045 reqhead->reassert_version = req->r_reassert_version;
1046
1047 req->r_stamp = jiffies;
1048 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1049
1050 ceph_msg_get(req->r_request); /* send consumes a ref */
1051 ceph_con_send(&req->r_osd->o_con, req->r_request);
1052 req->r_sent = req->r_osd->o_incarnation;
1053 }
1054
1055 /*
1056 * Send any requests in the queue (req_unsent).
1057 */
1058 static void send_queued(struct ceph_osd_client *osdc)
1059 {
1060 struct ceph_osd_request *req, *tmp;
1061
1062 dout("send_queued\n");
1063 mutex_lock(&osdc->request_mutex);
1064 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1065 __send_request(osdc, req);
1066 }
1067 mutex_unlock(&osdc->request_mutex);
1068 }
1069
1070 /*
1071 * Timeout callback, called every N seconds when 1 or more osd
1072 * requests has been active for more than N seconds. When this
1073 * happens, we ping all OSDs with requests who have timed out to
1074 * ensure any communications channel reset is detected. Reset the
1075 * request timeouts another N seconds in the future as we go.
1076 * Reschedule the timeout event another N seconds in future (unless
1077 * there are no open requests).
1078 */
1079 static void handle_timeout(struct work_struct *work)
1080 {
1081 struct ceph_osd_client *osdc =
1082 container_of(work, struct ceph_osd_client, timeout_work.work);
1083 struct ceph_osd_request *req, *last_req = NULL;
1084 struct ceph_osd *osd;
1085 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1086 unsigned long keepalive =
1087 osdc->client->options->osd_keepalive_timeout * HZ;
1088 unsigned long last_stamp = 0;
1089 struct list_head slow_osds;
1090 dout("timeout\n");
1091 down_read(&osdc->map_sem);
1092
1093 ceph_monc_request_next_osdmap(&osdc->client->monc);
1094
1095 mutex_lock(&osdc->request_mutex);
1096
1097 /*
1098 * reset osds that appear to be _really_ unresponsive. this
1099 * is a failsafe measure.. we really shouldn't be getting to
1100 * this point if the system is working properly. the monitors
1101 * should mark the osd as failed and we should find out about
1102 * it from an updated osd map.
1103 */
1104 while (timeout && !list_empty(&osdc->req_lru)) {
1105 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1106 r_req_lru_item);
1107
1108 /* hasn't been long enough since we sent it? */
1109 if (time_before(jiffies, req->r_stamp + timeout))
1110 break;
1111
1112 /* hasn't been long enough since it was acked? */
1113 if (req->r_request->ack_stamp == 0 ||
1114 time_before(jiffies, req->r_request->ack_stamp + timeout))
1115 break;
1116
1117 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1118 last_req = req;
1119 last_stamp = req->r_stamp;
1120
1121 osd = req->r_osd;
1122 BUG_ON(!osd);
1123 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1124 req->r_tid, osd->o_osd);
1125 __kick_osd_requests(osdc, osd);
1126 }
1127
1128 /*
1129 * ping osds that are a bit slow. this ensures that if there
1130 * is a break in the TCP connection we will notice, and reopen
1131 * a connection with that osd (from the fault callback).
1132 */
1133 INIT_LIST_HEAD(&slow_osds);
1134 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1135 if (time_before(jiffies, req->r_stamp + keepalive))
1136 break;
1137
1138 osd = req->r_osd;
1139 BUG_ON(!osd);
1140 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1141 req->r_tid, osd->o_osd);
1142 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1143 }
1144 while (!list_empty(&slow_osds)) {
1145 osd = list_entry(slow_osds.next, struct ceph_osd,
1146 o_keepalive_item);
1147 list_del_init(&osd->o_keepalive_item);
1148 ceph_con_keepalive(&osd->o_con);
1149 }
1150
1151 __schedule_osd_timeout(osdc);
1152 mutex_unlock(&osdc->request_mutex);
1153 send_queued(osdc);
1154 up_read(&osdc->map_sem);
1155 }
1156
1157 static void handle_osds_timeout(struct work_struct *work)
1158 {
1159 struct ceph_osd_client *osdc =
1160 container_of(work, struct ceph_osd_client,
1161 osds_timeout_work.work);
1162 unsigned long delay =
1163 osdc->client->options->osd_idle_ttl * HZ >> 2;
1164
1165 dout("osds timeout\n");
1166 down_read(&osdc->map_sem);
1167 remove_old_osds(osdc);
1168 up_read(&osdc->map_sem);
1169
1170 schedule_delayed_work(&osdc->osds_timeout_work,
1171 round_jiffies_relative(delay));
1172 }
1173
1174 static void complete_request(struct ceph_osd_request *req)
1175 {
1176 if (req->r_safe_callback)
1177 req->r_safe_callback(req, NULL);
1178 complete_all(&req->r_safe_completion); /* fsync waiter */
1179 }
1180
1181 /*
1182 * handle osd op reply. either call the callback if it is specified,
1183 * or do the completion to wake up the waiting thread.
1184 */
1185 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1186 struct ceph_connection *con)
1187 {
1188 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1189 struct ceph_osd_request *req;
1190 u64 tid;
1191 int numops, object_len, flags;
1192 s32 result;
1193
1194 tid = le64_to_cpu(msg->hdr.tid);
1195 if (msg->front.iov_len < sizeof(*rhead))
1196 goto bad;
1197 numops = le32_to_cpu(rhead->num_ops);
1198 object_len = le32_to_cpu(rhead->object_len);
1199 result = le32_to_cpu(rhead->result);
1200 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1201 numops * sizeof(struct ceph_osd_op))
1202 goto bad;
1203 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1204 /* lookup */
1205 mutex_lock(&osdc->request_mutex);
1206 req = __lookup_request(osdc, tid);
1207 if (req == NULL) {
1208 dout("handle_reply tid %llu dne\n", tid);
1209 mutex_unlock(&osdc->request_mutex);
1210 return;
1211 }
1212 ceph_osdc_get_request(req);
1213 flags = le32_to_cpu(rhead->flags);
1214
1215 /*
1216 * if this connection filled our message, drop our reference now, to
1217 * avoid a (safe but slower) revoke later.
1218 */
1219 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1220 dout(" dropping con_filling_msg ref %p\n", con);
1221 req->r_con_filling_msg = NULL;
1222 con->ops->put(con);
1223 }
1224
1225 if (!req->r_got_reply) {
1226 unsigned int bytes;
1227
1228 req->r_result = le32_to_cpu(rhead->result);
1229 bytes = le32_to_cpu(msg->hdr.data_len);
1230 dout("handle_reply result %d bytes %d\n", req->r_result,
1231 bytes);
1232 if (req->r_result == 0)
1233 req->r_result = bytes;
1234
1235 /* in case this is a write and we need to replay, */
1236 req->r_reassert_version = rhead->reassert_version;
1237
1238 req->r_got_reply = 1;
1239 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1240 dout("handle_reply tid %llu dup ack\n", tid);
1241 mutex_unlock(&osdc->request_mutex);
1242 goto done;
1243 }
1244
1245 dout("handle_reply tid %llu flags %d\n", tid, flags);
1246
1247 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1248 __register_linger_request(osdc, req);
1249
1250 /* either this is a read, or we got the safe response */
1251 if (result < 0 ||
1252 (flags & CEPH_OSD_FLAG_ONDISK) ||
1253 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1254 __unregister_request(osdc, req);
1255
1256 mutex_unlock(&osdc->request_mutex);
1257
1258 if (req->r_callback)
1259 req->r_callback(req, msg);
1260 else
1261 complete_all(&req->r_completion);
1262
1263 if (flags & CEPH_OSD_FLAG_ONDISK)
1264 complete_request(req);
1265
1266 done:
1267 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1268 ceph_osdc_put_request(req);
1269 return;
1270
1271 bad:
1272 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1273 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1274 (int)sizeof(*rhead));
1275 ceph_msg_dump(msg);
1276 }
1277
1278 static void reset_changed_osds(struct ceph_osd_client *osdc)
1279 {
1280 struct rb_node *p, *n;
1281
1282 for (p = rb_first(&osdc->osds); p; p = n) {
1283 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1284
1285 n = rb_next(p);
1286 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1287 memcmp(&osd->o_con.peer_addr,
1288 ceph_osd_addr(osdc->osdmap,
1289 osd->o_osd),
1290 sizeof(struct ceph_entity_addr)) != 0)
1291 __reset_osd(osdc, osd);
1292 }
1293 }
1294
1295 /*
1296 * Requeue requests whose mapping to an OSD has changed. If requests map to
1297 * no osd, request a new map.
1298 *
1299 * Caller should hold map_sem for read and request_mutex.
1300 */
1301 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1302 {
1303 struct ceph_osd_request *req, *nreq;
1304 struct rb_node *p;
1305 int needmap = 0;
1306 int err;
1307
1308 dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1309 mutex_lock(&osdc->request_mutex);
1310 for (p = rb_first(&osdc->requests); p; ) {
1311 req = rb_entry(p, struct ceph_osd_request, r_node);
1312 p = rb_next(p);
1313 err = __map_request(osdc, req, force_resend);
1314 if (err < 0)
1315 continue; /* error */
1316 if (req->r_osd == NULL) {
1317 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1318 needmap++; /* request a newer map */
1319 } else if (err > 0) {
1320 if (!req->r_linger) {
1321 dout("%p tid %llu requeued on osd%d\n", req,
1322 req->r_tid,
1323 req->r_osd ? req->r_osd->o_osd : -1);
1324 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1325 }
1326 }
1327 if (req->r_linger && list_empty(&req->r_linger_item)) {
1328 /*
1329 * register as a linger so that we will
1330 * re-submit below and get a new tid
1331 */
1332 dout("%p tid %llu restart on osd%d\n",
1333 req, req->r_tid,
1334 req->r_osd ? req->r_osd->o_osd : -1);
1335 __register_linger_request(osdc, req);
1336 __unregister_request(osdc, req);
1337 }
1338 }
1339
1340 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1341 r_linger_item) {
1342 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1343
1344 err = __map_request(osdc, req, force_resend);
1345 if (err == 0)
1346 continue; /* no change and no osd was specified */
1347 if (err < 0)
1348 continue; /* hrm! */
1349 if (req->r_osd == NULL) {
1350 dout("tid %llu maps to no valid osd\n", req->r_tid);
1351 needmap++; /* request a newer map */
1352 continue;
1353 }
1354
1355 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1356 req->r_osd ? req->r_osd->o_osd : -1);
1357 __unregister_linger_request(osdc, req);
1358 __register_request(osdc, req);
1359 }
1360 mutex_unlock(&osdc->request_mutex);
1361
1362 if (needmap) {
1363 dout("%d requests for down osds, need new map\n", needmap);
1364 ceph_monc_request_next_osdmap(&osdc->client->monc);
1365 }
1366 }
1367
1368
1369 /*
1370 * Process updated osd map.
1371 *
1372 * The message contains any number of incremental and full maps, normally
1373 * indicating some sort of topology change in the cluster. Kick requests
1374 * off to different OSDs as needed.
1375 */
1376 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1377 {
1378 void *p, *end, *next;
1379 u32 nr_maps, maplen;
1380 u32 epoch;
1381 struct ceph_osdmap *newmap = NULL, *oldmap;
1382 int err;
1383 struct ceph_fsid fsid;
1384
1385 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1386 p = msg->front.iov_base;
1387 end = p + msg->front.iov_len;
1388
1389 /* verify fsid */
1390 ceph_decode_need(&p, end, sizeof(fsid), bad);
1391 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1392 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1393 return;
1394
1395 down_write(&osdc->map_sem);
1396
1397 /* incremental maps */
1398 ceph_decode_32_safe(&p, end, nr_maps, bad);
1399 dout(" %d inc maps\n", nr_maps);
1400 while (nr_maps > 0) {
1401 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1402 epoch = ceph_decode_32(&p);
1403 maplen = ceph_decode_32(&p);
1404 ceph_decode_need(&p, end, maplen, bad);
1405 next = p + maplen;
1406 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1407 dout("applying incremental map %u len %d\n",
1408 epoch, maplen);
1409 newmap = osdmap_apply_incremental(&p, next,
1410 osdc->osdmap,
1411 &osdc->client->msgr);
1412 if (IS_ERR(newmap)) {
1413 err = PTR_ERR(newmap);
1414 goto bad;
1415 }
1416 BUG_ON(!newmap);
1417 if (newmap != osdc->osdmap) {
1418 ceph_osdmap_destroy(osdc->osdmap);
1419 osdc->osdmap = newmap;
1420 }
1421 kick_requests(osdc, 0);
1422 reset_changed_osds(osdc);
1423 } else {
1424 dout("ignoring incremental map %u len %d\n",
1425 epoch, maplen);
1426 }
1427 p = next;
1428 nr_maps--;
1429 }
1430 if (newmap)
1431 goto done;
1432
1433 /* full maps */
1434 ceph_decode_32_safe(&p, end, nr_maps, bad);
1435 dout(" %d full maps\n", nr_maps);
1436 while (nr_maps) {
1437 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1438 epoch = ceph_decode_32(&p);
1439 maplen = ceph_decode_32(&p);
1440 ceph_decode_need(&p, end, maplen, bad);
1441 if (nr_maps > 1) {
1442 dout("skipping non-latest full map %u len %d\n",
1443 epoch, maplen);
1444 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1445 dout("skipping full map %u len %d, "
1446 "older than our %u\n", epoch, maplen,
1447 osdc->osdmap->epoch);
1448 } else {
1449 int skipped_map = 0;
1450
1451 dout("taking full map %u len %d\n", epoch, maplen);
1452 newmap = osdmap_decode(&p, p+maplen);
1453 if (IS_ERR(newmap)) {
1454 err = PTR_ERR(newmap);
1455 goto bad;
1456 }
1457 BUG_ON(!newmap);
1458 oldmap = osdc->osdmap;
1459 osdc->osdmap = newmap;
1460 if (oldmap) {
1461 if (oldmap->epoch + 1 < newmap->epoch)
1462 skipped_map = 1;
1463 ceph_osdmap_destroy(oldmap);
1464 }
1465 kick_requests(osdc, skipped_map);
1466 }
1467 p += maplen;
1468 nr_maps--;
1469 }
1470
1471 done:
1472 downgrade_write(&osdc->map_sem);
1473 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1474
1475 /*
1476 * subscribe to subsequent osdmap updates if full to ensure
1477 * we find out when we are no longer full and stop returning
1478 * ENOSPC.
1479 */
1480 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1481 ceph_monc_request_next_osdmap(&osdc->client->monc);
1482
1483 send_queued(osdc);
1484 up_read(&osdc->map_sem);
1485 wake_up_all(&osdc->client->auth_wq);
1486 return;
1487
1488 bad:
1489 pr_err("osdc handle_map corrupt msg\n");
1490 ceph_msg_dump(msg);
1491 up_write(&osdc->map_sem);
1492 return;
1493 }
1494
1495 /*
1496 * watch/notify callback event infrastructure
1497 *
1498 * These callbacks are used both for watch and notify operations.
1499 */
1500 static void __release_event(struct kref *kref)
1501 {
1502 struct ceph_osd_event *event =
1503 container_of(kref, struct ceph_osd_event, kref);
1504
1505 dout("__release_event %p\n", event);
1506 kfree(event);
1507 }
1508
1509 static void get_event(struct ceph_osd_event *event)
1510 {
1511 kref_get(&event->kref);
1512 }
1513
1514 void ceph_osdc_put_event(struct ceph_osd_event *event)
1515 {
1516 kref_put(&event->kref, __release_event);
1517 }
1518 EXPORT_SYMBOL(ceph_osdc_put_event);
1519
1520 static void __insert_event(struct ceph_osd_client *osdc,
1521 struct ceph_osd_event *new)
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 (new->cookie < event->cookie)
1531 p = &(*p)->rb_left;
1532 else if (new->cookie > event->cookie)
1533 p = &(*p)->rb_right;
1534 else
1535 BUG();
1536 }
1537
1538 rb_link_node(&new->node, parent, p);
1539 rb_insert_color(&new->node, &osdc->event_tree);
1540 }
1541
1542 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1543 u64 cookie)
1544 {
1545 struct rb_node **p = &osdc->event_tree.rb_node;
1546 struct rb_node *parent = NULL;
1547 struct ceph_osd_event *event = NULL;
1548
1549 while (*p) {
1550 parent = *p;
1551 event = rb_entry(parent, struct ceph_osd_event, node);
1552 if (cookie < event->cookie)
1553 p = &(*p)->rb_left;
1554 else if (cookie > event->cookie)
1555 p = &(*p)->rb_right;
1556 else
1557 return event;
1558 }
1559 return NULL;
1560 }
1561
1562 static void __remove_event(struct ceph_osd_event *event)
1563 {
1564 struct ceph_osd_client *osdc = event->osdc;
1565
1566 if (!RB_EMPTY_NODE(&event->node)) {
1567 dout("__remove_event removed %p\n", event);
1568 rb_erase(&event->node, &osdc->event_tree);
1569 ceph_osdc_put_event(event);
1570 } else {
1571 dout("__remove_event didn't remove %p\n", event);
1572 }
1573 }
1574
1575 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1576 void (*event_cb)(u64, u64, u8, void *),
1577 int one_shot, void *data,
1578 struct ceph_osd_event **pevent)
1579 {
1580 struct ceph_osd_event *event;
1581
1582 event = kmalloc(sizeof(*event), GFP_NOIO);
1583 if (!event)
1584 return -ENOMEM;
1585
1586 dout("create_event %p\n", event);
1587 event->cb = event_cb;
1588 event->one_shot = one_shot;
1589 event->data = data;
1590 event->osdc = osdc;
1591 INIT_LIST_HEAD(&event->osd_node);
1592 kref_init(&event->kref); /* one ref for us */
1593 kref_get(&event->kref); /* one ref for the caller */
1594 init_completion(&event->completion);
1595
1596 spin_lock(&osdc->event_lock);
1597 event->cookie = ++osdc->event_count;
1598 __insert_event(osdc, event);
1599 spin_unlock(&osdc->event_lock);
1600
1601 *pevent = event;
1602 return 0;
1603 }
1604 EXPORT_SYMBOL(ceph_osdc_create_event);
1605
1606 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1607 {
1608 struct ceph_osd_client *osdc = event->osdc;
1609
1610 dout("cancel_event %p\n", event);
1611 spin_lock(&osdc->event_lock);
1612 __remove_event(event);
1613 spin_unlock(&osdc->event_lock);
1614 ceph_osdc_put_event(event); /* caller's */
1615 }
1616 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1617
1618
1619 static void do_event_work(struct work_struct *work)
1620 {
1621 struct ceph_osd_event_work *event_work =
1622 container_of(work, struct ceph_osd_event_work, work);
1623 struct ceph_osd_event *event = event_work->event;
1624 u64 ver = event_work->ver;
1625 u64 notify_id = event_work->notify_id;
1626 u8 opcode = event_work->opcode;
1627
1628 dout("do_event_work completing %p\n", event);
1629 event->cb(ver, notify_id, opcode, event->data);
1630 complete(&event->completion);
1631 dout("do_event_work completed %p\n", event);
1632 ceph_osdc_put_event(event);
1633 kfree(event_work);
1634 }
1635
1636
1637 /*
1638 * Process osd watch notifications
1639 */
1640 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1641 {
1642 void *p, *end;
1643 u8 proto_ver;
1644 u64 cookie, ver, notify_id;
1645 u8 opcode;
1646 struct ceph_osd_event *event;
1647 struct ceph_osd_event_work *event_work;
1648
1649 p = msg->front.iov_base;
1650 end = p + msg->front.iov_len;
1651
1652 ceph_decode_8_safe(&p, end, proto_ver, bad);
1653 ceph_decode_8_safe(&p, end, opcode, bad);
1654 ceph_decode_64_safe(&p, end, cookie, bad);
1655 ceph_decode_64_safe(&p, end, ver, bad);
1656 ceph_decode_64_safe(&p, end, notify_id, bad);
1657
1658 spin_lock(&osdc->event_lock);
1659 event = __find_event(osdc, cookie);
1660 if (event) {
1661 get_event(event);
1662 if (event->one_shot)
1663 __remove_event(event);
1664 }
1665 spin_unlock(&osdc->event_lock);
1666 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1667 cookie, ver, event);
1668 if (event) {
1669 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1670 if (!event_work) {
1671 dout("ERROR: could not allocate event_work\n");
1672 goto done_err;
1673 }
1674 INIT_WORK(&event_work->work, do_event_work);
1675 event_work->event = event;
1676 event_work->ver = ver;
1677 event_work->notify_id = notify_id;
1678 event_work->opcode = opcode;
1679 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1680 dout("WARNING: failed to queue notify event work\n");
1681 goto done_err;
1682 }
1683 }
1684
1685 return;
1686
1687 done_err:
1688 complete(&event->completion);
1689 ceph_osdc_put_event(event);
1690 return;
1691
1692 bad:
1693 pr_err("osdc handle_watch_notify corrupt msg\n");
1694 return;
1695 }
1696
1697 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1698 {
1699 int err;
1700
1701 dout("wait_event %p\n", event);
1702 err = wait_for_completion_interruptible_timeout(&event->completion,
1703 timeout * HZ);
1704 ceph_osdc_put_event(event);
1705 if (err > 0)
1706 err = 0;
1707 dout("wait_event %p returns %d\n", event, err);
1708 return err;
1709 }
1710 EXPORT_SYMBOL(ceph_osdc_wait_event);
1711
1712 /*
1713 * Register request, send initial attempt.
1714 */
1715 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1716 struct ceph_osd_request *req,
1717 bool nofail)
1718 {
1719 int rc = 0;
1720
1721 req->r_request->pages = req->r_pages;
1722 req->r_request->nr_pages = req->r_num_pages;
1723 #ifdef CONFIG_BLOCK
1724 req->r_request->bio = req->r_bio;
1725 #endif
1726 req->r_request->trail = req->r_trail;
1727
1728 register_request(osdc, req);
1729
1730 down_read(&osdc->map_sem);
1731 mutex_lock(&osdc->request_mutex);
1732 /*
1733 * a racing kick_requests() may have sent the message for us
1734 * while we dropped request_mutex above, so only send now if
1735 * the request still han't been touched yet.
1736 */
1737 if (req->r_sent == 0) {
1738 rc = __map_request(osdc, req, 0);
1739 if (rc < 0) {
1740 if (nofail) {
1741 dout("osdc_start_request failed map, "
1742 " will retry %lld\n", req->r_tid);
1743 rc = 0;
1744 }
1745 goto out_unlock;
1746 }
1747 if (req->r_osd == NULL) {
1748 dout("send_request %p no up osds in pg\n", req);
1749 ceph_monc_request_next_osdmap(&osdc->client->monc);
1750 } else {
1751 __send_request(osdc, req);
1752 }
1753 rc = 0;
1754 }
1755
1756 out_unlock:
1757 mutex_unlock(&osdc->request_mutex);
1758 up_read(&osdc->map_sem);
1759 return rc;
1760 }
1761 EXPORT_SYMBOL(ceph_osdc_start_request);
1762
1763 /*
1764 * wait for a request to complete
1765 */
1766 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1767 struct ceph_osd_request *req)
1768 {
1769 int rc;
1770
1771 rc = wait_for_completion_interruptible(&req->r_completion);
1772 if (rc < 0) {
1773 mutex_lock(&osdc->request_mutex);
1774 __cancel_request(req);
1775 __unregister_request(osdc, req);
1776 mutex_unlock(&osdc->request_mutex);
1777 complete_request(req);
1778 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1779 return rc;
1780 }
1781
1782 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1783 return req->r_result;
1784 }
1785 EXPORT_SYMBOL(ceph_osdc_wait_request);
1786
1787 /*
1788 * sync - wait for all in-flight requests to flush. avoid starvation.
1789 */
1790 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1791 {
1792 struct ceph_osd_request *req;
1793 u64 last_tid, next_tid = 0;
1794
1795 mutex_lock(&osdc->request_mutex);
1796 last_tid = osdc->last_tid;
1797 while (1) {
1798 req = __lookup_request_ge(osdc, next_tid);
1799 if (!req)
1800 break;
1801 if (req->r_tid > last_tid)
1802 break;
1803
1804 next_tid = req->r_tid + 1;
1805 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1806 continue;
1807
1808 ceph_osdc_get_request(req);
1809 mutex_unlock(&osdc->request_mutex);
1810 dout("sync waiting on tid %llu (last is %llu)\n",
1811 req->r_tid, last_tid);
1812 wait_for_completion(&req->r_safe_completion);
1813 mutex_lock(&osdc->request_mutex);
1814 ceph_osdc_put_request(req);
1815 }
1816 mutex_unlock(&osdc->request_mutex);
1817 dout("sync done (thru tid %llu)\n", last_tid);
1818 }
1819 EXPORT_SYMBOL(ceph_osdc_sync);
1820
1821 /*
1822 * init, shutdown
1823 */
1824 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1825 {
1826 int err;
1827
1828 dout("init\n");
1829 osdc->client = client;
1830 osdc->osdmap = NULL;
1831 init_rwsem(&osdc->map_sem);
1832 init_completion(&osdc->map_waiters);
1833 osdc->last_requested_map = 0;
1834 mutex_init(&osdc->request_mutex);
1835 osdc->last_tid = 0;
1836 osdc->osds = RB_ROOT;
1837 INIT_LIST_HEAD(&osdc->osd_lru);
1838 osdc->requests = RB_ROOT;
1839 INIT_LIST_HEAD(&osdc->req_lru);
1840 INIT_LIST_HEAD(&osdc->req_unsent);
1841 INIT_LIST_HEAD(&osdc->req_notarget);
1842 INIT_LIST_HEAD(&osdc->req_linger);
1843 osdc->num_requests = 0;
1844 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1845 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1846 spin_lock_init(&osdc->event_lock);
1847 osdc->event_tree = RB_ROOT;
1848 osdc->event_count = 0;
1849
1850 schedule_delayed_work(&osdc->osds_timeout_work,
1851 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1852
1853 err = -ENOMEM;
1854 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1855 sizeof(struct ceph_osd_request));
1856 if (!osdc->req_mempool)
1857 goto out;
1858
1859 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
1860 OSD_OP_FRONT_LEN, 10, true,
1861 "osd_op");
1862 if (err < 0)
1863 goto out_mempool;
1864 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1865 OSD_OPREPLY_FRONT_LEN, 10, true,
1866 "osd_op_reply");
1867 if (err < 0)
1868 goto out_msgpool;
1869
1870 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1871 if (IS_ERR(osdc->notify_wq)) {
1872 err = PTR_ERR(osdc->notify_wq);
1873 osdc->notify_wq = NULL;
1874 goto out_msgpool;
1875 }
1876 return 0;
1877
1878 out_msgpool:
1879 ceph_msgpool_destroy(&osdc->msgpool_op);
1880 out_mempool:
1881 mempool_destroy(osdc->req_mempool);
1882 out:
1883 return err;
1884 }
1885 EXPORT_SYMBOL(ceph_osdc_init);
1886
1887 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1888 {
1889 flush_workqueue(osdc->notify_wq);
1890 destroy_workqueue(osdc->notify_wq);
1891 cancel_delayed_work_sync(&osdc->timeout_work);
1892 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1893 if (osdc->osdmap) {
1894 ceph_osdmap_destroy(osdc->osdmap);
1895 osdc->osdmap = NULL;
1896 }
1897 remove_all_osds(osdc);
1898 mempool_destroy(osdc->req_mempool);
1899 ceph_msgpool_destroy(&osdc->msgpool_op);
1900 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1901 }
1902 EXPORT_SYMBOL(ceph_osdc_stop);
1903
1904 /*
1905 * Read some contiguous pages. If we cross a stripe boundary, shorten
1906 * *plen. Return number of bytes read, or error.
1907 */
1908 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1909 struct ceph_vino vino, struct ceph_file_layout *layout,
1910 u64 off, u64 *plen,
1911 u32 truncate_seq, u64 truncate_size,
1912 struct page **pages, int num_pages, int page_align)
1913 {
1914 struct ceph_osd_request *req;
1915 int rc = 0;
1916
1917 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1918 vino.snap, off, *plen);
1919 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1920 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1921 NULL, 0, truncate_seq, truncate_size, NULL,
1922 false, 1, page_align);
1923 if (!req)
1924 return -ENOMEM;
1925
1926 /* it may be a short read due to an object boundary */
1927 req->r_pages = pages;
1928
1929 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1930 off, *plen, req->r_num_pages, page_align);
1931
1932 rc = ceph_osdc_start_request(osdc, req, false);
1933 if (!rc)
1934 rc = ceph_osdc_wait_request(osdc, req);
1935
1936 ceph_osdc_put_request(req);
1937 dout("readpages result %d\n", rc);
1938 return rc;
1939 }
1940 EXPORT_SYMBOL(ceph_osdc_readpages);
1941
1942 /*
1943 * do a synchronous write on N pages
1944 */
1945 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1946 struct ceph_file_layout *layout,
1947 struct ceph_snap_context *snapc,
1948 u64 off, u64 len,
1949 u32 truncate_seq, u64 truncate_size,
1950 struct timespec *mtime,
1951 struct page **pages, int num_pages,
1952 int flags, int do_sync, bool nofail)
1953 {
1954 struct ceph_osd_request *req;
1955 int rc = 0;
1956 int page_align = off & ~PAGE_MASK;
1957
1958 BUG_ON(vino.snap != CEPH_NOSNAP);
1959 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1960 CEPH_OSD_OP_WRITE,
1961 flags | CEPH_OSD_FLAG_ONDISK |
1962 CEPH_OSD_FLAG_WRITE,
1963 snapc, do_sync,
1964 truncate_seq, truncate_size, mtime,
1965 nofail, 1, page_align);
1966 if (!req)
1967 return -ENOMEM;
1968
1969 /* it may be a short write due to an object boundary */
1970 req->r_pages = pages;
1971 dout("writepages %llu~%llu (%d pages)\n", off, len,
1972 req->r_num_pages);
1973
1974 rc = ceph_osdc_start_request(osdc, req, nofail);
1975 if (!rc)
1976 rc = ceph_osdc_wait_request(osdc, req);
1977
1978 ceph_osdc_put_request(req);
1979 if (rc == 0)
1980 rc = len;
1981 dout("writepages result %d\n", rc);
1982 return rc;
1983 }
1984 EXPORT_SYMBOL(ceph_osdc_writepages);
1985
1986 /*
1987 * handle incoming message
1988 */
1989 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1990 {
1991 struct ceph_osd *osd = con->private;
1992 struct ceph_osd_client *osdc;
1993 int type = le16_to_cpu(msg->hdr.type);
1994
1995 if (!osd)
1996 goto out;
1997 osdc = osd->o_osdc;
1998
1999 switch (type) {
2000 case CEPH_MSG_OSD_MAP:
2001 ceph_osdc_handle_map(osdc, msg);
2002 break;
2003 case CEPH_MSG_OSD_OPREPLY:
2004 handle_reply(osdc, msg, con);
2005 break;
2006 case CEPH_MSG_WATCH_NOTIFY:
2007 handle_watch_notify(osdc, msg);
2008 break;
2009
2010 default:
2011 pr_err("received unknown message type %d %s\n", type,
2012 ceph_msg_type_name(type));
2013 }
2014 out:
2015 ceph_msg_put(msg);
2016 }
2017
2018 /*
2019 * lookup and return message for incoming reply. set up reply message
2020 * pages.
2021 */
2022 static struct ceph_msg *get_reply(struct ceph_connection *con,
2023 struct ceph_msg_header *hdr,
2024 int *skip)
2025 {
2026 struct ceph_osd *osd = con->private;
2027 struct ceph_osd_client *osdc = osd->o_osdc;
2028 struct ceph_msg *m;
2029 struct ceph_osd_request *req;
2030 int front = le32_to_cpu(hdr->front_len);
2031 int data_len = le32_to_cpu(hdr->data_len);
2032 u64 tid;
2033
2034 tid = le64_to_cpu(hdr->tid);
2035 mutex_lock(&osdc->request_mutex);
2036 req = __lookup_request(osdc, tid);
2037 if (!req) {
2038 *skip = 1;
2039 m = NULL;
2040 dout("get_reply unknown tid %llu from osd%d\n", tid,
2041 osd->o_osd);
2042 goto out;
2043 }
2044
2045 if (req->r_con_filling_msg) {
2046 dout("%s revoking msg %p from old con %p\n", __func__,
2047 req->r_reply, req->r_con_filling_msg);
2048 ceph_msg_revoke_incoming(req->r_reply);
2049 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2050 req->r_con_filling_msg = NULL;
2051 }
2052
2053 if (front > req->r_reply->front.iov_len) {
2054 pr_warning("get_reply front %d > preallocated %d\n",
2055 front, (int)req->r_reply->front.iov_len);
2056 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2057 if (!m)
2058 goto out;
2059 ceph_msg_put(req->r_reply);
2060 req->r_reply = m;
2061 }
2062 m = ceph_msg_get(req->r_reply);
2063
2064 if (data_len > 0) {
2065 int want = calc_pages_for(req->r_page_alignment, data_len);
2066
2067 if (unlikely(req->r_num_pages < want)) {
2068 pr_warning("tid %lld reply has %d bytes %d pages, we"
2069 " had only %d pages ready\n", tid, data_len,
2070 want, req->r_num_pages);
2071 *skip = 1;
2072 ceph_msg_put(m);
2073 m = NULL;
2074 goto out;
2075 }
2076 m->pages = req->r_pages;
2077 m->nr_pages = req->r_num_pages;
2078 m->page_alignment = req->r_page_alignment;
2079 #ifdef CONFIG_BLOCK
2080 m->bio = req->r_bio;
2081 #endif
2082 }
2083 *skip = 0;
2084 req->r_con_filling_msg = con->ops->get(con);
2085 dout("get_reply tid %lld %p\n", tid, m);
2086
2087 out:
2088 mutex_unlock(&osdc->request_mutex);
2089 return m;
2090
2091 }
2092
2093 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2094 struct ceph_msg_header *hdr,
2095 int *skip)
2096 {
2097 struct ceph_osd *osd = con->private;
2098 int type = le16_to_cpu(hdr->type);
2099 int front = le32_to_cpu(hdr->front_len);
2100
2101 *skip = 0;
2102 switch (type) {
2103 case CEPH_MSG_OSD_MAP:
2104 case CEPH_MSG_WATCH_NOTIFY:
2105 return ceph_msg_new(type, front, GFP_NOFS, false);
2106 case CEPH_MSG_OSD_OPREPLY:
2107 return get_reply(con, hdr, skip);
2108 default:
2109 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2110 osd->o_osd);
2111 *skip = 1;
2112 return NULL;
2113 }
2114 }
2115
2116 /*
2117 * Wrappers to refcount containing ceph_osd struct
2118 */
2119 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2120 {
2121 struct ceph_osd *osd = con->private;
2122 if (get_osd(osd))
2123 return con;
2124 return NULL;
2125 }
2126
2127 static void put_osd_con(struct ceph_connection *con)
2128 {
2129 struct ceph_osd *osd = con->private;
2130 put_osd(osd);
2131 }
2132
2133 /*
2134 * authentication
2135 */
2136 /*
2137 * Note: returned pointer is the address of a structure that's
2138 * managed separately. Caller must *not* attempt to free it.
2139 */
2140 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2141 int *proto, int force_new)
2142 {
2143 struct ceph_osd *o = con->private;
2144 struct ceph_osd_client *osdc = o->o_osdc;
2145 struct ceph_auth_client *ac = osdc->client->monc.auth;
2146 struct ceph_auth_handshake *auth = &o->o_auth;
2147
2148 if (force_new && auth->authorizer) {
2149 if (ac->ops && ac->ops->destroy_authorizer)
2150 ac->ops->destroy_authorizer(ac, auth->authorizer);
2151 auth->authorizer = NULL;
2152 }
2153 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2154 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2155 auth);
2156 if (ret)
2157 return ERR_PTR(ret);
2158 }
2159 *proto = ac->protocol;
2160
2161 return auth;
2162 }
2163
2164
2165 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2166 {
2167 struct ceph_osd *o = con->private;
2168 struct ceph_osd_client *osdc = o->o_osdc;
2169 struct ceph_auth_client *ac = osdc->client->monc.auth;
2170
2171 /*
2172 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2173 * XXX which do we do: succeed or fail?
2174 */
2175 return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2176 }
2177
2178 static int invalidate_authorizer(struct ceph_connection *con)
2179 {
2180 struct ceph_osd *o = con->private;
2181 struct ceph_osd_client *osdc = o->o_osdc;
2182 struct ceph_auth_client *ac = osdc->client->monc.auth;
2183
2184 if (ac->ops && ac->ops->invalidate_authorizer)
2185 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2186
2187 return ceph_monc_validate_auth(&osdc->client->monc);
2188 }
2189
2190 static const struct ceph_connection_operations osd_con_ops = {
2191 .get = get_osd_con,
2192 .put = put_osd_con,
2193 .dispatch = dispatch,
2194 .get_authorizer = get_authorizer,
2195 .verify_authorizer_reply = verify_authorizer_reply,
2196 .invalidate_authorizer = invalidate_authorizer,
2197 .alloc_msg = alloc_msg,
2198 .fault = osd_reset,
2199 };
Linux kernel - Deliverables
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