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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / net / ceph / osd_client.c
blobf7b56e23988c62e9ea776d9dd31b1a53c8b450e3
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
468 ops[0].op = opcode;
469 ops[0].extent.truncate_seq = truncate_seq;
470 ops[0].extent.truncate_size = truncate_size;
471 ops[0].payload_len = 0;
472
473 if (do_sync) {
474 ops[1].op = CEPH_OSD_OP_STARTSYNC;
475 ops[1].payload_len = 0;
476 ops[2].op = 0;
477 } else
478 ops[1].op = 0;
479
480 req = ceph_osdc_alloc_request(osdc, flags,
481 snapc, ops,
482 use_mempool,
483 GFP_NOFS, NULL, NULL);
484 if (!req)
485 return NULL;
486
487 /* calculate max write size */
488 calc_layout(osdc, vino, layout, off, plen, req, ops);
489 req->r_file_layout = *layout; /* keep a copy */
490
491 /* in case it differs from natural (file) alignment that
492 calc_layout filled in for us */
493 req->r_num_pages = calc_pages_for(page_align, *plen);
494 req->r_page_alignment = page_align;
495
496 ceph_osdc_build_request(req, off, plen, ops,
497 snapc,
498 mtime,
499 req->r_oid, req->r_oid_len);
500
501 return req;
502 }
503 EXPORT_SYMBOL(ceph_osdc_new_request);
504
505 /*
506 * We keep osd requests in an rbtree, sorted by ->r_tid.
507 */
508 static void __insert_request(struct ceph_osd_client *osdc,
509 struct ceph_osd_request *new)
510 {
511 struct rb_node **p = &osdc->requests.rb_node;
512 struct rb_node *parent = NULL;
513 struct ceph_osd_request *req = NULL;
514
515 while (*p) {
516 parent = *p;
517 req = rb_entry(parent, struct ceph_osd_request, r_node);
518 if (new->r_tid < req->r_tid)
519 p = &(*p)->rb_left;
520 else if (new->r_tid > req->r_tid)
521 p = &(*p)->rb_right;
522 else
523 BUG();
524 }
525
526 rb_link_node(&new->r_node, parent, p);
527 rb_insert_color(&new->r_node, &osdc->requests);
528 }
529
530 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
531 u64 tid)
532 {
533 struct ceph_osd_request *req;
534 struct rb_node *n = osdc->requests.rb_node;
535
536 while (n) {
537 req = rb_entry(n, struct ceph_osd_request, r_node);
538 if (tid < req->r_tid)
539 n = n->rb_left;
540 else if (tid > req->r_tid)
541 n = n->rb_right;
542 else
543 return req;
544 }
545 return NULL;
546 }
547
548 static struct ceph_osd_request *
549 __lookup_request_ge(struct ceph_osd_client *osdc,
550 u64 tid)
551 {
552 struct ceph_osd_request *req;
553 struct rb_node *n = osdc->requests.rb_node;
554
555 while (n) {
556 req = rb_entry(n, struct ceph_osd_request, r_node);
557 if (tid < req->r_tid) {
558 if (!n->rb_left)
559 return req;
560 n = n->rb_left;
561 } else if (tid > req->r_tid) {
562 n = n->rb_right;
563 } else {
564 return req;
565 }
566 }
567 return NULL;
568 }
569
570 /*
571 * Resubmit requests pending on the given osd.
572 */
573 static void __kick_osd_requests(struct ceph_osd_client *osdc,
574 struct ceph_osd *osd)
575 {
576 struct ceph_osd_request *req, *nreq;
577 int err;
578
579 dout("__kick_osd_requests osd%d\n", osd->o_osd);
580 err = __reset_osd(osdc, osd);
581 if (err == -EAGAIN)
582 return;
583
584 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
585 list_move(&req->r_req_lru_item, &osdc->req_unsent);
586 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
587 osd->o_osd);
588 if (!req->r_linger)
589 req->r_flags |= CEPH_OSD_FLAG_RETRY;
590 }
591
592 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
593 r_linger_osd) {
594 /*
595 * reregister request prior to unregistering linger so
596 * that r_osd is preserved.
597 */
598 BUG_ON(!list_empty(&req->r_req_lru_item));
599 __register_request(osdc, req);
600 list_add(&req->r_req_lru_item, &osdc->req_unsent);
601 list_add(&req->r_osd_item, &req->r_osd->o_requests);
602 __unregister_linger_request(osdc, req);
603 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
604 osd->o_osd);
605 }
606 }
607
608 static void kick_osd_requests(struct ceph_osd_client *osdc,
609 struct ceph_osd *kickosd)
610 {
611 mutex_lock(&osdc->request_mutex);
612 __kick_osd_requests(osdc, kickosd);
613 mutex_unlock(&osdc->request_mutex);
614 }
615
616 /*
617 * If the osd connection drops, we need to resubmit all requests.
618 */
619 static void osd_reset(struct ceph_connection *con)
620 {
621 struct ceph_osd *osd = con->private;
622 struct ceph_osd_client *osdc;
623
624 if (!osd)
625 return;
626 dout("osd_reset osd%d\n", osd->o_osd);
627 osdc = osd->o_osdc;
628 down_read(&osdc->map_sem);
629 kick_osd_requests(osdc, osd);
630 send_queued(osdc);
631 up_read(&osdc->map_sem);
632 }
633
634 /*
635 * Track open sessions with osds.
636 */
637 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
638 {
639 struct ceph_osd *osd;
640
641 osd = kzalloc(sizeof(*osd), GFP_NOFS);
642 if (!osd)
643 return NULL;
644
645 atomic_set(&osd->o_ref, 1);
646 osd->o_osdc = osdc;
647 osd->o_osd = onum;
648 INIT_LIST_HEAD(&osd->o_requests);
649 INIT_LIST_HEAD(&osd->o_linger_requests);
650 INIT_LIST_HEAD(&osd->o_osd_lru);
651 osd->o_incarnation = 1;
652
653 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
654
655 INIT_LIST_HEAD(&osd->o_keepalive_item);
656 return osd;
657 }
658
659 static struct ceph_osd *get_osd(struct ceph_osd *osd)
660 {
661 if (atomic_inc_not_zero(&osd->o_ref)) {
662 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
663 atomic_read(&osd->o_ref));
664 return osd;
665 } else {
666 dout("get_osd %p FAIL\n", osd);
667 return NULL;
668 }
669 }
670
671 static void put_osd(struct ceph_osd *osd)
672 {
673 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
674 atomic_read(&osd->o_ref) - 1);
675 if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
676 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
677
678 if (ac->ops && ac->ops->destroy_authorizer)
679 ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
680 kfree(osd);
681 }
682 }
683
684 /*
685 * remove an osd from our map
686 */
687 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
688 {
689 dout("__remove_osd %p\n", osd);
690 BUG_ON(!list_empty(&osd->o_requests));
691 rb_erase(&osd->o_node, &osdc->osds);
692 list_del_init(&osd->o_osd_lru);
693 ceph_con_close(&osd->o_con);
694 put_osd(osd);
695 }
696
697 static void remove_all_osds(struct ceph_osd_client *osdc)
698 {
699 dout("%s %p\n", __func__, osdc);
700 mutex_lock(&osdc->request_mutex);
701 while (!RB_EMPTY_ROOT(&osdc->osds)) {
702 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
703 struct ceph_osd, o_node);
704 __remove_osd(osdc, osd);
705 }
706 mutex_unlock(&osdc->request_mutex);
707 }
708
709 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
710 struct ceph_osd *osd)
711 {
712 dout("__move_osd_to_lru %p\n", osd);
713 BUG_ON(!list_empty(&osd->o_osd_lru));
714 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
715 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
716 }
717
718 static void __remove_osd_from_lru(struct ceph_osd *osd)
719 {
720 dout("__remove_osd_from_lru %p\n", osd);
721 if (!list_empty(&osd->o_osd_lru))
722 list_del_init(&osd->o_osd_lru);
723 }
724
725 static void remove_old_osds(struct ceph_osd_client *osdc)
726 {
727 struct ceph_osd *osd, *nosd;
728
729 dout("__remove_old_osds %p\n", osdc);
730 mutex_lock(&osdc->request_mutex);
731 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
732 if (time_before(jiffies, osd->lru_ttl))
733 break;
734 __remove_osd(osdc, osd);
735 }
736 mutex_unlock(&osdc->request_mutex);
737 }
738
739 /*
740 * reset osd connect
741 */
742 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
743 {
744 struct ceph_osd_request *req;
745 int ret = 0;
746
747 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
748 if (list_empty(&osd->o_requests) &&
749 list_empty(&osd->o_linger_requests)) {
750 __remove_osd(osdc, osd);
751 } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
752 &osd->o_con.peer_addr,
753 sizeof(osd->o_con.peer_addr)) == 0 &&
754 !ceph_con_opened(&osd->o_con)) {
755 dout(" osd addr hasn't changed and connection never opened,"
756 " letting msgr retry");
757 /* touch each r_stamp for handle_timeout()'s benfit */
758 list_for_each_entry(req, &osd->o_requests, r_osd_item)
759 req->r_stamp = jiffies;
760 ret = -EAGAIN;
761 } else {
762 ceph_con_close(&osd->o_con);
763 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
764 &osdc->osdmap->osd_addr[osd->o_osd]);
765 osd->o_incarnation++;
766 }
767 return ret;
768 }
769
770 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
771 {
772 struct rb_node **p = &osdc->osds.rb_node;
773 struct rb_node *parent = NULL;
774 struct ceph_osd *osd = NULL;
775
776 dout("__insert_osd %p osd%d\n", new, new->o_osd);
777 while (*p) {
778 parent = *p;
779 osd = rb_entry(parent, struct ceph_osd, o_node);
780 if (new->o_osd < osd->o_osd)
781 p = &(*p)->rb_left;
782 else if (new->o_osd > osd->o_osd)
783 p = &(*p)->rb_right;
784 else
785 BUG();
786 }
787
788 rb_link_node(&new->o_node, parent, p);
789 rb_insert_color(&new->o_node, &osdc->osds);
790 }
791
792 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
793 {
794 struct ceph_osd *osd;
795 struct rb_node *n = osdc->osds.rb_node;
796
797 while (n) {
798 osd = rb_entry(n, struct ceph_osd, o_node);
799 if (o < osd->o_osd)
800 n = n->rb_left;
801 else if (o > osd->o_osd)
802 n = n->rb_right;
803 else
804 return osd;
805 }
806 return NULL;
807 }
808
809 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
810 {
811 schedule_delayed_work(&osdc->timeout_work,
812 osdc->client->options->osd_keepalive_timeout * HZ);
813 }
814
815 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
816 {
817 cancel_delayed_work(&osdc->timeout_work);
818 }
819
820 /*
821 * Register request, assign tid. If this is the first request, set up
822 * the timeout event.
823 */
824 static void __register_request(struct ceph_osd_client *osdc,
825 struct ceph_osd_request *req)
826 {
827 req->r_tid = ++osdc->last_tid;
828 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
829 dout("__register_request %p tid %lld\n", req, req->r_tid);
830 __insert_request(osdc, req);
831 ceph_osdc_get_request(req);
832 osdc->num_requests++;
833 if (osdc->num_requests == 1) {
834 dout(" first request, scheduling timeout\n");
835 __schedule_osd_timeout(osdc);
836 }
837 }
838
839 static void register_request(struct ceph_osd_client *osdc,
840 struct ceph_osd_request *req)
841 {
842 mutex_lock(&osdc->request_mutex);
843 __register_request(osdc, req);
844 mutex_unlock(&osdc->request_mutex);
845 }
846
847 /*
848 * called under osdc->request_mutex
849 */
850 static void __unregister_request(struct ceph_osd_client *osdc,
851 struct ceph_osd_request *req)
852 {
853 if (RB_EMPTY_NODE(&req->r_node)) {
854 dout("__unregister_request %p tid %lld not registered\n",
855 req, req->r_tid);
856 return;
857 }
858
859 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
860 rb_erase(&req->r_node, &osdc->requests);
861 osdc->num_requests--;
862
863 if (req->r_osd) {
864 /* make sure the original request isn't in flight. */
865 ceph_msg_revoke(req->r_request);
866
867 list_del_init(&req->r_osd_item);
868 if (list_empty(&req->r_osd->o_requests) &&
869 list_empty(&req->r_osd->o_linger_requests)) {
870 dout("moving osd to %p lru\n", req->r_osd);
871 __move_osd_to_lru(osdc, req->r_osd);
872 }
873 if (list_empty(&req->r_linger_item))
874 req->r_osd = NULL;
875 }
876
877 ceph_osdc_put_request(req);
878
879 list_del_init(&req->r_req_lru_item);
880 if (osdc->num_requests == 0) {
881 dout(" no requests, canceling timeout\n");
882 __cancel_osd_timeout(osdc);
883 }
884 }
885
886 /*
887 * Cancel a previously queued request message
888 */
889 static void __cancel_request(struct ceph_osd_request *req)
890 {
891 if (req->r_sent && req->r_osd) {
892 ceph_msg_revoke(req->r_request);
893 req->r_sent = 0;
894 }
895 }
896
897 static void __register_linger_request(struct ceph_osd_client *osdc,
898 struct ceph_osd_request *req)
899 {
900 dout("__register_linger_request %p\n", req);
901 list_add_tail(&req->r_linger_item, &osdc->req_linger);
902 if (req->r_osd)
903 list_add_tail(&req->r_linger_osd,
904 &req->r_osd->o_linger_requests);
905 }
906
907 static void __unregister_linger_request(struct ceph_osd_client *osdc,
908 struct ceph_osd_request *req)
909 {
910 dout("__unregister_linger_request %p\n", req);
911 if (req->r_osd) {
912 list_del_init(&req->r_linger_item);
913 list_del_init(&req->r_linger_osd);
914
915 if (list_empty(&req->r_osd->o_requests) &&
916 list_empty(&req->r_osd->o_linger_requests)) {
917 dout("moving osd to %p lru\n", req->r_osd);
918 __move_osd_to_lru(osdc, req->r_osd);
919 }
920 if (list_empty(&req->r_osd_item))
921 req->r_osd = NULL;
922 }
923 }
924
925 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
926 struct ceph_osd_request *req)
927 {
928 mutex_lock(&osdc->request_mutex);
929 if (req->r_linger) {
930 __unregister_linger_request(osdc, req);
931 ceph_osdc_put_request(req);
932 }
933 mutex_unlock(&osdc->request_mutex);
934 }
935 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
936
937 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
938 struct ceph_osd_request *req)
939 {
940 if (!req->r_linger) {
941 dout("set_request_linger %p\n", req);
942 req->r_linger = 1;
943 /*
944 * caller is now responsible for calling
945 * unregister_linger_request
946 */
947 ceph_osdc_get_request(req);
948 }
949 }
950 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
951
952 /*
953 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
954 * (as needed), and set the request r_osd appropriately. If there is
955 * no up osd, set r_osd to NULL. Move the request to the appropriate list
956 * (unsent, homeless) or leave on in-flight lru.
957 *
958 * Return 0 if unchanged, 1 if changed, or negative on error.
959 *
960 * Caller should hold map_sem for read and request_mutex.
961 */
962 static int __map_request(struct ceph_osd_client *osdc,
963 struct ceph_osd_request *req, int force_resend)
964 {
965 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
966 struct ceph_pg pgid;
967 int acting[CEPH_PG_MAX_SIZE];
968 int o = -1, num = 0;
969 int err;
970
971 dout("map_request %p tid %lld\n", req, req->r_tid);
972 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
973 &req->r_file_layout, osdc->osdmap);
974 if (err) {
975 list_move(&req->r_req_lru_item, &osdc->req_notarget);
976 return err;
977 }
978 pgid = reqhead->layout.ol_pgid;
979 req->r_pgid = pgid;
980
981 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
982 if (err > 0) {
983 o = acting[0];
984 num = err;
985 }
986
987 if ((!force_resend &&
988 req->r_osd && req->r_osd->o_osd == o &&
989 req->r_sent >= req->r_osd->o_incarnation &&
990 req->r_num_pg_osds == num &&
991 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
992 (req->r_osd == NULL && o == -1))
993 return 0; /* no change */
994
995 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
996 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
997 req->r_osd ? req->r_osd->o_osd : -1);
998
999 /* record full pg acting set */
1000 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1001 req->r_num_pg_osds = num;
1002
1003 if (req->r_osd) {
1004 __cancel_request(req);
1005 list_del_init(&req->r_osd_item);
1006 req->r_osd = NULL;
1007 }
1008
1009 req->r_osd = __lookup_osd(osdc, o);
1010 if (!req->r_osd && o >= 0) {
1011 err = -ENOMEM;
1012 req->r_osd = create_osd(osdc, o);
1013 if (!req->r_osd) {
1014 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1015 goto out;
1016 }
1017
1018 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1019 __insert_osd(osdc, req->r_osd);
1020
1021 ceph_con_open(&req->r_osd->o_con,
1022 CEPH_ENTITY_TYPE_OSD, o,
1023 &osdc->osdmap->osd_addr[o]);
1024 }
1025
1026 if (req->r_osd) {
1027 __remove_osd_from_lru(req->r_osd);
1028 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1029 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1030 } else {
1031 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1032 }
1033 err = 1; /* osd or pg changed */
1034
1035 out:
1036 return err;
1037 }
1038
1039 /*
1040 * caller should hold map_sem (for read) and request_mutex
1041 */
1042 static void __send_request(struct ceph_osd_client *osdc,
1043 struct ceph_osd_request *req)
1044 {
1045 struct ceph_osd_request_head *reqhead;
1046
1047 dout("send_request %p tid %llu to osd%d flags %d\n",
1048 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1049
1050 reqhead = req->r_request->front.iov_base;
1051 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1052 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1053 reqhead->reassert_version = req->r_reassert_version;
1054
1055 req->r_stamp = jiffies;
1056 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1057
1058 ceph_msg_get(req->r_request); /* send consumes a ref */
1059 ceph_con_send(&req->r_osd->o_con, req->r_request);
1060 req->r_sent = req->r_osd->o_incarnation;
1061 }
1062
1063 /*
1064 * Send any requests in the queue (req_unsent).
1065 */
1066 static void send_queued(struct ceph_osd_client *osdc)
1067 {
1068 struct ceph_osd_request *req, *tmp;
1069
1070 dout("send_queued\n");
1071 mutex_lock(&osdc->request_mutex);
1072 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1073 __send_request(osdc, req);
1074 }
1075 mutex_unlock(&osdc->request_mutex);
1076 }
1077
1078 /*
1079 * Timeout callback, called every N seconds when 1 or more osd
1080 * requests has been active for more than N seconds. When this
1081 * happens, we ping all OSDs with requests who have timed out to
1082 * ensure any communications channel reset is detected. Reset the
1083 * request timeouts another N seconds in the future as we go.
1084 * Reschedule the timeout event another N seconds in future (unless
1085 * there are no open requests).
1086 */
1087 static void handle_timeout(struct work_struct *work)
1088 {
1089 struct ceph_osd_client *osdc =
1090 container_of(work, struct ceph_osd_client, timeout_work.work);
1091 struct ceph_osd_request *req, *last_req = NULL;
1092 struct ceph_osd *osd;
1093 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1094 unsigned long keepalive =
1095 osdc->client->options->osd_keepalive_timeout * HZ;
1096 unsigned long last_stamp = 0;
1097 struct list_head slow_osds;
1098 dout("timeout\n");
1099 down_read(&osdc->map_sem);
1100
1101 ceph_monc_request_next_osdmap(&osdc->client->monc);
1102
1103 mutex_lock(&osdc->request_mutex);
1104
1105 /*
1106 * reset osds that appear to be _really_ unresponsive. this
1107 * is a failsafe measure.. we really shouldn't be getting to
1108 * this point if the system is working properly. the monitors
1109 * should mark the osd as failed and we should find out about
1110 * it from an updated osd map.
1111 */
1112 while (timeout && !list_empty(&osdc->req_lru)) {
1113 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1114 r_req_lru_item);
1115
1116 /* hasn't been long enough since we sent it? */
1117 if (time_before(jiffies, req->r_stamp + timeout))
1118 break;
1119
1120 /* hasn't been long enough since it was acked? */
1121 if (req->r_request->ack_stamp == 0 ||
1122 time_before(jiffies, req->r_request->ack_stamp + timeout))
1123 break;
1124
1125 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1126 last_req = req;
1127 last_stamp = req->r_stamp;
1128
1129 osd = req->r_osd;
1130 BUG_ON(!osd);
1131 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1132 req->r_tid, osd->o_osd);
1133 __kick_osd_requests(osdc, osd);
1134 }
1135
1136 /*
1137 * ping osds that are a bit slow. this ensures that if there
1138 * is a break in the TCP connection we will notice, and reopen
1139 * a connection with that osd (from the fault callback).
1140 */
1141 INIT_LIST_HEAD(&slow_osds);
1142 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1143 if (time_before(jiffies, req->r_stamp + keepalive))
1144 break;
1145
1146 osd = req->r_osd;
1147 BUG_ON(!osd);
1148 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1149 req->r_tid, osd->o_osd);
1150 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1151 }
1152 while (!list_empty(&slow_osds)) {
1153 osd = list_entry(slow_osds.next, struct ceph_osd,
1154 o_keepalive_item);
1155 list_del_init(&osd->o_keepalive_item);
1156 ceph_con_keepalive(&osd->o_con);
1157 }
1158
1159 __schedule_osd_timeout(osdc);
1160 mutex_unlock(&osdc->request_mutex);
1161 send_queued(osdc);
1162 up_read(&osdc->map_sem);
1163 }
1164
1165 static void handle_osds_timeout(struct work_struct *work)
1166 {
1167 struct ceph_osd_client *osdc =
1168 container_of(work, struct ceph_osd_client,
1169 osds_timeout_work.work);
1170 unsigned long delay =
1171 osdc->client->options->osd_idle_ttl * HZ >> 2;
1172
1173 dout("osds timeout\n");
1174 down_read(&osdc->map_sem);
1175 remove_old_osds(osdc);
1176 up_read(&osdc->map_sem);
1177
1178 schedule_delayed_work(&osdc->osds_timeout_work,
1179 round_jiffies_relative(delay));
1180 }
1181
1182 static void complete_request(struct ceph_osd_request *req)
1183 {
1184 if (req->r_safe_callback)
1185 req->r_safe_callback(req, NULL);
1186 complete_all(&req->r_safe_completion); /* fsync waiter */
1187 }
1188
1189 /*
1190 * handle osd op reply. either call the callback if it is specified,
1191 * or do the completion to wake up the waiting thread.
1192 */
1193 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1194 struct ceph_connection *con)
1195 {
1196 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1197 struct ceph_osd_request *req;
1198 u64 tid;
1199 int numops, object_len, flags;
1200 s32 result;
1201
1202 tid = le64_to_cpu(msg->hdr.tid);
1203 if (msg->front.iov_len < sizeof(*rhead))
1204 goto bad;
1205 numops = le32_to_cpu(rhead->num_ops);
1206 object_len = le32_to_cpu(rhead->object_len);
1207 result = le32_to_cpu(rhead->result);
1208 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1209 numops * sizeof(struct ceph_osd_op))
1210 goto bad;
1211 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1212 /* lookup */
1213 mutex_lock(&osdc->request_mutex);
1214 req = __lookup_request(osdc, tid);
1215 if (req == NULL) {
1216 dout("handle_reply tid %llu dne\n", tid);
1217 mutex_unlock(&osdc->request_mutex);
1218 return;
1219 }
1220 ceph_osdc_get_request(req);
1221 flags = le32_to_cpu(rhead->flags);
1222
1223 /*
1224 * if this connection filled our message, drop our reference now, to
1225 * avoid a (safe but slower) revoke later.
1226 */
1227 if (req->r_con_filling_msg == con && req->r_reply == msg) {
1228 dout(" dropping con_filling_msg ref %p\n", con);
1229 req->r_con_filling_msg = NULL;
1230 con->ops->put(con);
1231 }
1232
1233 if (!req->r_got_reply) {
1234 unsigned int bytes;
1235
1236 req->r_result = le32_to_cpu(rhead->result);
1237 bytes = le32_to_cpu(msg->hdr.data_len);
1238 dout("handle_reply result %d bytes %d\n", req->r_result,
1239 bytes);
1240 if (req->r_result == 0)
1241 req->r_result = bytes;
1242
1243 /* in case this is a write and we need to replay, */
1244 req->r_reassert_version = rhead->reassert_version;
1245
1246 req->r_got_reply = 1;
1247 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1248 dout("handle_reply tid %llu dup ack\n", tid);
1249 mutex_unlock(&osdc->request_mutex);
1250 goto done;
1251 }
1252
1253 dout("handle_reply tid %llu flags %d\n", tid, flags);
1254
1255 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1256 __register_linger_request(osdc, req);
1257
1258 /* either this is a read, or we got the safe response */
1259 if (result < 0 ||
1260 (flags & CEPH_OSD_FLAG_ONDISK) ||
1261 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1262 __unregister_request(osdc, req);
1263
1264 mutex_unlock(&osdc->request_mutex);
1265
1266 if (req->r_callback)
1267 req->r_callback(req, msg);
1268 else
1269 complete_all(&req->r_completion);
1270
1271 if (flags & CEPH_OSD_FLAG_ONDISK)
1272 complete_request(req);
1273
1274 done:
1275 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1276 ceph_osdc_put_request(req);
1277 return;
1278
1279 bad:
1280 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1281 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1282 (int)sizeof(*rhead));
1283 ceph_msg_dump(msg);
1284 }
1285
1286 static void reset_changed_osds(struct ceph_osd_client *osdc)
1287 {
1288 struct rb_node *p, *n;
1289
1290 for (p = rb_first(&osdc->osds); p; p = n) {
1291 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1292
1293 n = rb_next(p);
1294 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1295 memcmp(&osd->o_con.peer_addr,
1296 ceph_osd_addr(osdc->osdmap,
1297 osd->o_osd),
1298 sizeof(struct ceph_entity_addr)) != 0)
1299 __reset_osd(osdc, osd);
1300 }
1301 }
1302
1303 /*
1304 * Requeue requests whose mapping to an OSD has changed. If requests map to
1305 * no osd, request a new map.
1306 *
1307 * Caller should hold map_sem for read and request_mutex.
1308 */
1309 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1310 {
1311 struct ceph_osd_request *req, *nreq;
1312 struct rb_node *p;
1313 int needmap = 0;
1314 int err;
1315
1316 dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1317 mutex_lock(&osdc->request_mutex);
1318 for (p = rb_first(&osdc->requests); p; ) {
1319 req = rb_entry(p, struct ceph_osd_request, r_node);
1320 p = rb_next(p);
1321 err = __map_request(osdc, req, force_resend);
1322 if (err < 0)
1323 continue; /* error */
1324 if (req->r_osd == NULL) {
1325 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1326 needmap++; /* request a newer map */
1327 } else if (err > 0) {
1328 if (!req->r_linger) {
1329 dout("%p tid %llu requeued on osd%d\n", req,
1330 req->r_tid,
1331 req->r_osd ? req->r_osd->o_osd : -1);
1332 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1333 }
1334 }
1335 if (req->r_linger && list_empty(&req->r_linger_item)) {
1336 /*
1337 * register as a linger so that we will
1338 * re-submit below and get a new tid
1339 */
1340 dout("%p tid %llu restart on osd%d\n",
1341 req, req->r_tid,
1342 req->r_osd ? req->r_osd->o_osd : -1);
1343 __register_linger_request(osdc, req);
1344 __unregister_request(osdc, req);
1345 }
1346 }
1347
1348 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1349 r_linger_item) {
1350 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1351
1352 err = __map_request(osdc, req, force_resend);
1353 if (err == 0)
1354 continue; /* no change and no osd was specified */
1355 if (err < 0)
1356 continue; /* hrm! */
1357 if (req->r_osd == NULL) {
1358 dout("tid %llu maps to no valid osd\n", req->r_tid);
1359 needmap++; /* request a newer map */
1360 continue;
1361 }
1362
1363 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1364 req->r_osd ? req->r_osd->o_osd : -1);
1365 __unregister_linger_request(osdc, req);
1366 __register_request(osdc, req);
1367 }
1368 mutex_unlock(&osdc->request_mutex);
1369
1370 if (needmap) {
1371 dout("%d requests for down osds, need new map\n", needmap);
1372 ceph_monc_request_next_osdmap(&osdc->client->monc);
1373 }
1374 }
1375
1376
1377 /*
1378 * Process updated osd map.
1379 *
1380 * The message contains any number of incremental and full maps, normally
1381 * indicating some sort of topology change in the cluster. Kick requests
1382 * off to different OSDs as needed.
1383 */
1384 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1385 {
1386 void *p, *end, *next;
1387 u32 nr_maps, maplen;
1388 u32 epoch;
1389 struct ceph_osdmap *newmap = NULL, *oldmap;
1390 int err;
1391 struct ceph_fsid fsid;
1392
1393 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1394 p = msg->front.iov_base;
1395 end = p + msg->front.iov_len;
1396
1397 /* verify fsid */
1398 ceph_decode_need(&p, end, sizeof(fsid), bad);
1399 ceph_decode_copy(&p, &fsid, sizeof(fsid));
1400 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1401 return;
1402
1403 down_write(&osdc->map_sem);
1404
1405 /* incremental maps */
1406 ceph_decode_32_safe(&p, end, nr_maps, bad);
1407 dout(" %d inc maps\n", nr_maps);
1408 while (nr_maps > 0) {
1409 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1410 epoch = ceph_decode_32(&p);
1411 maplen = ceph_decode_32(&p);
1412 ceph_decode_need(&p, end, maplen, bad);
1413 next = p + maplen;
1414 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1415 dout("applying incremental map %u len %d\n",
1416 epoch, maplen);
1417 newmap = osdmap_apply_incremental(&p, next,
1418 osdc->osdmap,
1419 &osdc->client->msgr);
1420 if (IS_ERR(newmap)) {
1421 err = PTR_ERR(newmap);
1422 goto bad;
1423 }
1424 BUG_ON(!newmap);
1425 if (newmap != osdc->osdmap) {
1426 ceph_osdmap_destroy(osdc->osdmap);
1427 osdc->osdmap = newmap;
1428 }
1429 kick_requests(osdc, 0);
1430 reset_changed_osds(osdc);
1431 } else {
1432 dout("ignoring incremental map %u len %d\n",
1433 epoch, maplen);
1434 }
1435 p = next;
1436 nr_maps--;
1437 }
1438 if (newmap)
1439 goto done;
1440
1441 /* full maps */
1442 ceph_decode_32_safe(&p, end, nr_maps, bad);
1443 dout(" %d full maps\n", nr_maps);
1444 while (nr_maps) {
1445 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1446 epoch = ceph_decode_32(&p);
1447 maplen = ceph_decode_32(&p);
1448 ceph_decode_need(&p, end, maplen, bad);
1449 if (nr_maps > 1) {
1450 dout("skipping non-latest full map %u len %d\n",
1451 epoch, maplen);
1452 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1453 dout("skipping full map %u len %d, "
1454 "older than our %u\n", epoch, maplen,
1455 osdc->osdmap->epoch);
1456 } else {
1457 int skipped_map = 0;
1458
1459 dout("taking full map %u len %d\n", epoch, maplen);
1460 newmap = osdmap_decode(&p, p+maplen);
1461 if (IS_ERR(newmap)) {
1462 err = PTR_ERR(newmap);
1463 goto bad;
1464 }
1465 BUG_ON(!newmap);
1466 oldmap = osdc->osdmap;
1467 osdc->osdmap = newmap;
1468 if (oldmap) {
1469 if (oldmap->epoch + 1 < newmap->epoch)
1470 skipped_map = 1;
1471 ceph_osdmap_destroy(oldmap);
1472 }
1473 kick_requests(osdc, skipped_map);
1474 }
1475 p += maplen;
1476 nr_maps--;
1477 }
1478
1479 done:
1480 downgrade_write(&osdc->map_sem);
1481 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1482
1483 /*
1484 * subscribe to subsequent osdmap updates if full to ensure
1485 * we find out when we are no longer full and stop returning
1486 * ENOSPC.
1487 */
1488 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1489 ceph_monc_request_next_osdmap(&osdc->client->monc);
1490
1491 send_queued(osdc);
1492 up_read(&osdc->map_sem);
1493 wake_up_all(&osdc->client->auth_wq);
1494 return;
1495
1496 bad:
1497 pr_err("osdc handle_map corrupt msg\n");
1498 ceph_msg_dump(msg);
1499 up_write(&osdc->map_sem);
1500 return;
1501 }
1502
1503 /*
1504 * watch/notify callback event infrastructure
1505 *
1506 * These callbacks are used both for watch and notify operations.
1507 */
1508 static void __release_event(struct kref *kref)
1509 {
1510 struct ceph_osd_event *event =
1511 container_of(kref, struct ceph_osd_event, kref);
1512
1513 dout("__release_event %p\n", event);
1514 kfree(event);
1515 }
1516
1517 static void get_event(struct ceph_osd_event *event)
1518 {
1519 kref_get(&event->kref);
1520 }
1521
1522 void ceph_osdc_put_event(struct ceph_osd_event *event)
1523 {
1524 kref_put(&event->kref, __release_event);
1525 }
1526 EXPORT_SYMBOL(ceph_osdc_put_event);
1527
1528 static void __insert_event(struct ceph_osd_client *osdc,
1529 struct ceph_osd_event *new)
1530 {
1531 struct rb_node **p = &osdc->event_tree.rb_node;
1532 struct rb_node *parent = NULL;
1533 struct ceph_osd_event *event = NULL;
1534
1535 while (*p) {
1536 parent = *p;
1537 event = rb_entry(parent, struct ceph_osd_event, node);
1538 if (new->cookie < event->cookie)
1539 p = &(*p)->rb_left;
1540 else if (new->cookie > event->cookie)
1541 p = &(*p)->rb_right;
1542 else
1543 BUG();
1544 }
1545
1546 rb_link_node(&new->node, parent, p);
1547 rb_insert_color(&new->node, &osdc->event_tree);
1548 }
1549
1550 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1551 u64 cookie)
1552 {
1553 struct rb_node **p = &osdc->event_tree.rb_node;
1554 struct rb_node *parent = NULL;
1555 struct ceph_osd_event *event = NULL;
1556
1557 while (*p) {
1558 parent = *p;
1559 event = rb_entry(parent, struct ceph_osd_event, node);
1560 if (cookie < event->cookie)
1561 p = &(*p)->rb_left;
1562 else if (cookie > event->cookie)
1563 p = &(*p)->rb_right;
1564 else
1565 return event;
1566 }
1567 return NULL;
1568 }
1569
1570 static void __remove_event(struct ceph_osd_event *event)
1571 {
1572 struct ceph_osd_client *osdc = event->osdc;
1573
1574 if (!RB_EMPTY_NODE(&event->node)) {
1575 dout("__remove_event removed %p\n", event);
1576 rb_erase(&event->node, &osdc->event_tree);
1577 ceph_osdc_put_event(event);
1578 } else {
1579 dout("__remove_event didn't remove %p\n", event);
1580 }
1581 }
1582
1583 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1584 void (*event_cb)(u64, u64, u8, void *),
1585 int one_shot, void *data,
1586 struct ceph_osd_event **pevent)
1587 {
1588 struct ceph_osd_event *event;
1589
1590 event = kmalloc(sizeof(*event), GFP_NOIO);
1591 if (!event)
1592 return -ENOMEM;
1593
1594 dout("create_event %p\n", event);
1595 event->cb = event_cb;
1596 event->one_shot = one_shot;
1597 event->data = data;
1598 event->osdc = osdc;
1599 INIT_LIST_HEAD(&event->osd_node);
1600 kref_init(&event->kref); /* one ref for us */
1601 kref_get(&event->kref); /* one ref for the caller */
1602 init_completion(&event->completion);
1603
1604 spin_lock(&osdc->event_lock);
1605 event->cookie = ++osdc->event_count;
1606 __insert_event(osdc, event);
1607 spin_unlock(&osdc->event_lock);
1608
1609 *pevent = event;
1610 return 0;
1611 }
1612 EXPORT_SYMBOL(ceph_osdc_create_event);
1613
1614 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1615 {
1616 struct ceph_osd_client *osdc = event->osdc;
1617
1618 dout("cancel_event %p\n", event);
1619 spin_lock(&osdc->event_lock);
1620 __remove_event(event);
1621 spin_unlock(&osdc->event_lock);
1622 ceph_osdc_put_event(event); /* caller's */
1623 }
1624 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1625
1626
1627 static void do_event_work(struct work_struct *work)
1628 {
1629 struct ceph_osd_event_work *event_work =
1630 container_of(work, struct ceph_osd_event_work, work);
1631 struct ceph_osd_event *event = event_work->event;
1632 u64 ver = event_work->ver;
1633 u64 notify_id = event_work->notify_id;
1634 u8 opcode = event_work->opcode;
1635
1636 dout("do_event_work completing %p\n", event);
1637 event->cb(ver, notify_id, opcode, event->data);
1638 complete(&event->completion);
1639 dout("do_event_work completed %p\n", event);
1640 ceph_osdc_put_event(event);
1641 kfree(event_work);
1642 }
1643
1644
1645 /*
1646 * Process osd watch notifications
1647 */
1648 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1649 {
1650 void *p, *end;
1651 u8 proto_ver;
1652 u64 cookie, ver, notify_id;
1653 u8 opcode;
1654 struct ceph_osd_event *event;
1655 struct ceph_osd_event_work *event_work;
1656
1657 p = msg->front.iov_base;
1658 end = p + msg->front.iov_len;
1659
1660 ceph_decode_8_safe(&p, end, proto_ver, bad);
1661 ceph_decode_8_safe(&p, end, opcode, bad);
1662 ceph_decode_64_safe(&p, end, cookie, bad);
1663 ceph_decode_64_safe(&p, end, ver, bad);
1664 ceph_decode_64_safe(&p, end, notify_id, bad);
1665
1666 spin_lock(&osdc->event_lock);
1667 event = __find_event(osdc, cookie);
1668 if (event) {
1669 get_event(event);
1670 if (event->one_shot)
1671 __remove_event(event);
1672 }
1673 spin_unlock(&osdc->event_lock);
1674 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1675 cookie, ver, event);
1676 if (event) {
1677 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1678 if (!event_work) {
1679 dout("ERROR: could not allocate event_work\n");
1680 goto done_err;
1681 }
1682 INIT_WORK(&event_work->work, do_event_work);
1683 event_work->event = event;
1684 event_work->ver = ver;
1685 event_work->notify_id = notify_id;
1686 event_work->opcode = opcode;
1687 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1688 dout("WARNING: failed to queue notify event work\n");
1689 goto done_err;
1690 }
1691 }
1692
1693 return;
1694
1695 done_err:
1696 complete(&event->completion);
1697 ceph_osdc_put_event(event);
1698 return;
1699
1700 bad:
1701 pr_err("osdc handle_watch_notify corrupt msg\n");
1702 return;
1703 }
1704
1705 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1706 {
1707 int err;
1708
1709 dout("wait_event %p\n", event);
1710 err = wait_for_completion_interruptible_timeout(&event->completion,
1711 timeout * HZ);
1712 ceph_osdc_put_event(event);
1713 if (err > 0)
1714 err = 0;
1715 dout("wait_event %p returns %d\n", event, err);
1716 return err;
1717 }
1718 EXPORT_SYMBOL(ceph_osdc_wait_event);
1719
1720 /*
1721 * Register request, send initial attempt.
1722 */
1723 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1724 struct ceph_osd_request *req,
1725 bool nofail)
1726 {
1727 int rc = 0;
1728
1729 req->r_request->pages = req->r_pages;
1730 req->r_request->nr_pages = req->r_num_pages;
1731 #ifdef CONFIG_BLOCK
1732 req->r_request->bio = req->r_bio;
1733 #endif
1734 req->r_request->trail = req->r_trail;
1735
1736 register_request(osdc, req);
1737
1738 down_read(&osdc->map_sem);
1739 mutex_lock(&osdc->request_mutex);
1740 /*
1741 * a racing kick_requests() may have sent the message for us
1742 * while we dropped request_mutex above, so only send now if
1743 * the request still han't been touched yet.
1744 */
1745 if (req->r_sent == 0) {
1746 rc = __map_request(osdc, req, 0);
1747 if (rc < 0) {
1748 if (nofail) {
1749 dout("osdc_start_request failed map, "
1750 " will retry %lld\n", req->r_tid);
1751 rc = 0;
1752 }
1753 goto out_unlock;
1754 }
1755 if (req->r_osd == NULL) {
1756 dout("send_request %p no up osds in pg\n", req);
1757 ceph_monc_request_next_osdmap(&osdc->client->monc);
1758 } else {
1759 __send_request(osdc, req);
1760 }
1761 rc = 0;
1762 }
1763
1764 out_unlock:
1765 mutex_unlock(&osdc->request_mutex);
1766 up_read(&osdc->map_sem);
1767 return rc;
1768 }
1769 EXPORT_SYMBOL(ceph_osdc_start_request);
1770
1771 /*
1772 * wait for a request to complete
1773 */
1774 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1775 struct ceph_osd_request *req)
1776 {
1777 int rc;
1778
1779 rc = wait_for_completion_interruptible(&req->r_completion);
1780 if (rc < 0) {
1781 mutex_lock(&osdc->request_mutex);
1782 __cancel_request(req);
1783 __unregister_request(osdc, req);
1784 mutex_unlock(&osdc->request_mutex);
1785 complete_request(req);
1786 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1787 return rc;
1788 }
1789
1790 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1791 return req->r_result;
1792 }
1793 EXPORT_SYMBOL(ceph_osdc_wait_request);
1794
1795 /*
1796 * sync - wait for all in-flight requests to flush. avoid starvation.
1797 */
1798 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1799 {
1800 struct ceph_osd_request *req;
1801 u64 last_tid, next_tid = 0;
1802
1803 mutex_lock(&osdc->request_mutex);
1804 last_tid = osdc->last_tid;
1805 while (1) {
1806 req = __lookup_request_ge(osdc, next_tid);
1807 if (!req)
1808 break;
1809 if (req->r_tid > last_tid)
1810 break;
1811
1812 next_tid = req->r_tid + 1;
1813 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1814 continue;
1815
1816 ceph_osdc_get_request(req);
1817 mutex_unlock(&osdc->request_mutex);
1818 dout("sync waiting on tid %llu (last is %llu)\n",
1819 req->r_tid, last_tid);
1820 wait_for_completion(&req->r_safe_completion);
1821 mutex_lock(&osdc->request_mutex);
1822 ceph_osdc_put_request(req);
1823 }
1824 mutex_unlock(&osdc->request_mutex);
1825 dout("sync done (thru tid %llu)\n", last_tid);
1826 }
1827 EXPORT_SYMBOL(ceph_osdc_sync);
1828
1829 /*
1830 * init, shutdown
1831 */
1832 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1833 {
1834 int err;
1835
1836 dout("init\n");
1837 osdc->client = client;
1838 osdc->osdmap = NULL;
1839 init_rwsem(&osdc->map_sem);
1840 init_completion(&osdc->map_waiters);
1841 osdc->last_requested_map = 0;
1842 mutex_init(&osdc->request_mutex);
1843 osdc->last_tid = 0;
1844 osdc->osds = RB_ROOT;
1845 INIT_LIST_HEAD(&osdc->osd_lru);
1846 osdc->requests = RB_ROOT;
1847 INIT_LIST_HEAD(&osdc->req_lru);
1848 INIT_LIST_HEAD(&osdc->req_unsent);
1849 INIT_LIST_HEAD(&osdc->req_notarget);
1850 INIT_LIST_HEAD(&osdc->req_linger);
1851 osdc->num_requests = 0;
1852 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1853 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1854 spin_lock_init(&osdc->event_lock);
1855 osdc->event_tree = RB_ROOT;
1856 osdc->event_count = 0;
1857
1858 schedule_delayed_work(&osdc->osds_timeout_work,
1859 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1860
1861 err = -ENOMEM;
1862 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1863 sizeof(struct ceph_osd_request));
1864 if (!osdc->req_mempool)
1865 goto out;
1866
1867 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
1868 OSD_OP_FRONT_LEN, 10, true,
1869 "osd_op");
1870 if (err < 0)
1871 goto out_mempool;
1872 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1873 OSD_OPREPLY_FRONT_LEN, 10, true,
1874 "osd_op_reply");
1875 if (err < 0)
1876 goto out_msgpool;
1877
1878 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1879 if (IS_ERR(osdc->notify_wq)) {
1880 err = PTR_ERR(osdc->notify_wq);
1881 osdc->notify_wq = NULL;
1882 goto out_msgpool;
1883 }
1884 return 0;
1885
1886 out_msgpool:
1887 ceph_msgpool_destroy(&osdc->msgpool_op);
1888 out_mempool:
1889 mempool_destroy(osdc->req_mempool);
1890 out:
1891 return err;
1892 }
1893 EXPORT_SYMBOL(ceph_osdc_init);
1894
1895 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1896 {
1897 flush_workqueue(osdc->notify_wq);
1898 destroy_workqueue(osdc->notify_wq);
1899 cancel_delayed_work_sync(&osdc->timeout_work);
1900 cancel_delayed_work_sync(&osdc->osds_timeout_work);
1901 if (osdc->osdmap) {
1902 ceph_osdmap_destroy(osdc->osdmap);
1903 osdc->osdmap = NULL;
1904 }
1905 remove_all_osds(osdc);
1906 mempool_destroy(osdc->req_mempool);
1907 ceph_msgpool_destroy(&osdc->msgpool_op);
1908 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1909 }
1910 EXPORT_SYMBOL(ceph_osdc_stop);
1911
1912 /*
1913 * Read some contiguous pages. If we cross a stripe boundary, shorten
1914 * *plen. Return number of bytes read, or error.
1915 */
1916 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1917 struct ceph_vino vino, struct ceph_file_layout *layout,
1918 u64 off, u64 *plen,
1919 u32 truncate_seq, u64 truncate_size,
1920 struct page **pages, int num_pages, int page_align)
1921 {
1922 struct ceph_osd_request *req;
1923 int rc = 0;
1924
1925 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1926 vino.snap, off, *plen);
1927 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1928 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1929 NULL, 0, truncate_seq, truncate_size, NULL,
1930 false, 1, page_align);
1931 if (!req)
1932 return -ENOMEM;
1933
1934 /* it may be a short read due to an object boundary */
1935 req->r_pages = pages;
1936
1937 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1938 off, *plen, req->r_num_pages, page_align);
1939
1940 rc = ceph_osdc_start_request(osdc, req, false);
1941 if (!rc)
1942 rc = ceph_osdc_wait_request(osdc, req);
1943
1944 ceph_osdc_put_request(req);
1945 dout("readpages result %d\n", rc);
1946 return rc;
1947 }
1948 EXPORT_SYMBOL(ceph_osdc_readpages);
1949
1950 /*
1951 * do a synchronous write on N pages
1952 */
1953 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1954 struct ceph_file_layout *layout,
1955 struct ceph_snap_context *snapc,
1956 u64 off, u64 len,
1957 u32 truncate_seq, u64 truncate_size,
1958 struct timespec *mtime,
1959 struct page **pages, int num_pages,
1960 int flags, int do_sync, bool nofail)
1961 {
1962 struct ceph_osd_request *req;
1963 int rc = 0;
1964 int page_align = off & ~PAGE_MASK;
1965
1966 BUG_ON(vino.snap != CEPH_NOSNAP);
1967 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1968 CEPH_OSD_OP_WRITE,
1969 flags | CEPH_OSD_FLAG_ONDISK |
1970 CEPH_OSD_FLAG_WRITE,
1971 snapc, do_sync,
1972 truncate_seq, truncate_size, mtime,
1973 nofail, 1, page_align);
1974 if (!req)
1975 return -ENOMEM;
1976
1977 /* it may be a short write due to an object boundary */
1978 req->r_pages = pages;
1979 dout("writepages %llu~%llu (%d pages)\n", off, len,
1980 req->r_num_pages);
1981
1982 rc = ceph_osdc_start_request(osdc, req, nofail);
1983 if (!rc)
1984 rc = ceph_osdc_wait_request(osdc, req);
1985
1986 ceph_osdc_put_request(req);
1987 if (rc == 0)
1988 rc = len;
1989 dout("writepages result %d\n", rc);
1990 return rc;
1991 }
1992 EXPORT_SYMBOL(ceph_osdc_writepages);
1993
1994 /*
1995 * handle incoming message
1996 */
1997 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1998 {
1999 struct ceph_osd *osd = con->private;
2000 struct ceph_osd_client *osdc;
2001 int type = le16_to_cpu(msg->hdr.type);
2002
2003 if (!osd)
2004 goto out;
2005 osdc = osd->o_osdc;
2006
2007 switch (type) {
2008 case CEPH_MSG_OSD_MAP:
2009 ceph_osdc_handle_map(osdc, msg);
2010 break;
2011 case CEPH_MSG_OSD_OPREPLY:
2012 handle_reply(osdc, msg, con);
2013 break;
2014 case CEPH_MSG_WATCH_NOTIFY:
2015 handle_watch_notify(osdc, msg);
2016 break;
2017
2018 default:
2019 pr_err("received unknown message type %d %s\n", type,
2020 ceph_msg_type_name(type));
2021 }
2022 out:
2023 ceph_msg_put(msg);
2024 }
2025
2026 /*
2027 * lookup and return message for incoming reply. set up reply message
2028 * pages.
2029 */
2030 static struct ceph_msg *get_reply(struct ceph_connection *con,
2031 struct ceph_msg_header *hdr,
2032 int *skip)
2033 {
2034 struct ceph_osd *osd = con->private;
2035 struct ceph_osd_client *osdc = osd->o_osdc;
2036 struct ceph_msg *m;
2037 struct ceph_osd_request *req;
2038 int front = le32_to_cpu(hdr->front_len);
2039 int data_len = le32_to_cpu(hdr->data_len);
2040 u64 tid;
2041
2042 tid = le64_to_cpu(hdr->tid);
2043 mutex_lock(&osdc->request_mutex);
2044 req = __lookup_request(osdc, tid);
2045 if (!req) {
2046 *skip = 1;
2047 m = NULL;
2048 dout("get_reply unknown tid %llu from osd%d\n", tid,
2049 osd->o_osd);
2050 goto out;
2051 }
2052
2053 if (req->r_con_filling_msg) {
2054 dout("%s revoking msg %p from old con %p\n", __func__,
2055 req->r_reply, req->r_con_filling_msg);
2056 ceph_msg_revoke_incoming(req->r_reply);
2057 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2058 req->r_con_filling_msg = NULL;
2059 }
2060
2061 if (front > req->r_reply->front.iov_len) {
2062 pr_warning("get_reply front %d > preallocated %d\n",
2063 front, (int)req->r_reply->front.iov_len);
2064 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2065 if (!m)
2066 goto out;
2067 ceph_msg_put(req->r_reply);
2068 req->r_reply = m;
2069 }
2070 m = ceph_msg_get(req->r_reply);
2071
2072 if (data_len > 0) {
2073 int want = calc_pages_for(req->r_page_alignment, data_len);
2074
2075 if (unlikely(req->r_num_pages < want)) {
2076 pr_warning("tid %lld reply has %d bytes %d pages, we"
2077 " had only %d pages ready\n", tid, data_len,
2078 want, req->r_num_pages);
2079 *skip = 1;
2080 ceph_msg_put(m);
2081 m = NULL;
2082 goto out;
2083 }
2084 m->pages = req->r_pages;
2085 m->nr_pages = req->r_num_pages;
2086 m->page_alignment = req->r_page_alignment;
2087 #ifdef CONFIG_BLOCK
2088 m->bio = req->r_bio;
2089 #endif
2090 }
2091 *skip = 0;
2092 req->r_con_filling_msg = con->ops->get(con);
2093 dout("get_reply tid %lld %p\n", tid, m);
2094
2095 out:
2096 mutex_unlock(&osdc->request_mutex);
2097 return m;
2098
2099 }
2100
2101 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2102 struct ceph_msg_header *hdr,
2103 int *skip)
2104 {
2105 struct ceph_osd *osd = con->private;
2106 int type = le16_to_cpu(hdr->type);
2107 int front = le32_to_cpu(hdr->front_len);
2108
2109 *skip = 0;
2110 switch (type) {
2111 case CEPH_MSG_OSD_MAP:
2112 case CEPH_MSG_WATCH_NOTIFY:
2113 return ceph_msg_new(type, front, GFP_NOFS, false);
2114 case CEPH_MSG_OSD_OPREPLY:
2115 return get_reply(con, hdr, skip);
2116 default:
2117 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2118 osd->o_osd);
2119 *skip = 1;
2120 return NULL;
2121 }
2122 }
2123
2124 /*
2125 * Wrappers to refcount containing ceph_osd struct
2126 */
2127 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2128 {
2129 struct ceph_osd *osd = con->private;
2130 if (get_osd(osd))
2131 return con;
2132 return NULL;
2133 }
2134
2135 static void put_osd_con(struct ceph_connection *con)
2136 {
2137 struct ceph_osd *osd = con->private;
2138 put_osd(osd);
2139 }
2140
2141 /*
2142 * authentication
2143 */
2144 /*
2145 * Note: returned pointer is the address of a structure that's
2146 * managed separately. Caller must *not* attempt to free it.
2147 */
2148 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2149 int *proto, int force_new)
2150 {
2151 struct ceph_osd *o = con->private;
2152 struct ceph_osd_client *osdc = o->o_osdc;
2153 struct ceph_auth_client *ac = osdc->client->monc.auth;
2154 struct ceph_auth_handshake *auth = &o->o_auth;
2155
2156 if (force_new && auth->authorizer) {
2157 if (ac->ops && ac->ops->destroy_authorizer)
2158 ac->ops->destroy_authorizer(ac, auth->authorizer);
2159 auth->authorizer = NULL;
2160 }
2161 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2162 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2163 auth);
2164 if (ret)
2165 return ERR_PTR(ret);
2166 }
2167 *proto = ac->protocol;
2168
2169 return auth;
2170 }
2171
2172
2173 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2174 {
2175 struct ceph_osd *o = con->private;
2176 struct ceph_osd_client *osdc = o->o_osdc;
2177 struct ceph_auth_client *ac = osdc->client->monc.auth;
2178
2179 /*
2180 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2181 * XXX which do we do: succeed or fail?
2182 */
2183 return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2184 }
2185
2186 static int invalidate_authorizer(struct ceph_connection *con)
2187 {
2188 struct ceph_osd *o = con->private;
2189 struct ceph_osd_client *osdc = o->o_osdc;
2190 struct ceph_auth_client *ac = osdc->client->monc.auth;
2191
2192 if (ac->ops && ac->ops->invalidate_authorizer)
2193 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2194
2195 return ceph_monc_validate_auth(&osdc->client->monc);
2196 }
2197
2198 static const struct ceph_connection_operations osd_con_ops = {
2199 .get = get_osd_con,
2200 .put = put_osd_con,
2201 .dispatch = dispatch,
2202 .get_authorizer = get_authorizer,
2203 .verify_authorizer_reply = verify_authorizer_reply,
2204 .invalidate_authorizer = invalidate_authorizer,
2205 .alloc_msg = alloc_msg,
2206 .fault = osd_reset,
2207 };
Linux ARM platform port for MOXA ART SoC