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Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[deliverable/linux.git] / net / ceph / osd_client.c
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/err.h>
6 #include <linux/highmem.h>
7 #include <linux/mm.h>
8 #include <linux/pagemap.h>
9 #include <linux/slab.h>
10 #include <linux/uaccess.h>
11 #ifdef CONFIG_BLOCK
12 #include <linux/bio.h>
13 #endif
14
15 #include <linux/ceph/libceph.h>
16 #include <linux/ceph/osd_client.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/auth.h>
20 #include <linux/ceph/pagelist.h>
21
22 #define OSD_OP_FRONT_LEN 4096
23 #define OSD_OPREPLY_FRONT_LEN 512
24
25 static struct kmem_cache *ceph_osd_request_cache;
26
27 static const struct ceph_connection_operations osd_con_ops;
28
29 static void __send_queued(struct ceph_osd_client *osdc);
30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
31 static void __register_request(struct ceph_osd_client *osdc,
32 struct ceph_osd_request *req);
33 static void __unregister_linger_request(struct ceph_osd_client *osdc,
34 struct ceph_osd_request *req);
35 static void __send_request(struct ceph_osd_client *osdc,
36 struct ceph_osd_request *req);
37
38 /*
39 * Implement client access to distributed object storage cluster.
40 *
41 * All data objects are stored within a cluster/cloud of OSDs, or
42 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
43 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
44 * remote daemons serving up and coordinating consistent and safe
45 * access to storage.
46 *
47 * Cluster membership and the mapping of data objects onto storage devices
48 * are described by the osd map.
49 *
50 * We keep track of pending OSD requests (read, write), resubmit
51 * requests to different OSDs when the cluster topology/data layout
52 * change, or retry the affected requests when the communications
53 * channel with an OSD is reset.
54 */
55
56 /*
57 * calculate the mapping of a file extent onto an object, and fill out the
58 * request accordingly. shorten extent as necessary if it crosses an
59 * object boundary.
60 *
61 * fill osd op in request message.
62 */
63 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
64 u64 *objnum, u64 *objoff, u64 *objlen)
65 {
66 u64 orig_len = *plen;
67 int r;
68
69 /* object extent? */
70 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
71 objoff, objlen);
72 if (r < 0)
73 return r;
74 if (*objlen < orig_len) {
75 *plen = *objlen;
76 dout(" skipping last %llu, final file extent %llu~%llu\n",
77 orig_len - *plen, off, *plen);
78 }
79
80 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
81
82 return 0;
83 }
84
85 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
86 {
87 memset(osd_data, 0, sizeof (*osd_data));
88 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
89 }
90
91 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
92 struct page **pages, u64 length, u32 alignment,
93 bool pages_from_pool, bool own_pages)
94 {
95 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
96 osd_data->pages = pages;
97 osd_data->length = length;
98 osd_data->alignment = alignment;
99 osd_data->pages_from_pool = pages_from_pool;
100 osd_data->own_pages = own_pages;
101 }
102
103 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
104 struct ceph_pagelist *pagelist)
105 {
106 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
107 osd_data->pagelist = pagelist;
108 }
109
110 #ifdef CONFIG_BLOCK
111 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
112 struct bio *bio, size_t bio_length)
113 {
114 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
115 osd_data->bio = bio;
116 osd_data->bio_length = bio_length;
117 }
118 #endif /* CONFIG_BLOCK */
119
120 #define osd_req_op_data(oreq, whch, typ, fld) \
121 ({ \
122 BUG_ON(whch >= (oreq)->r_num_ops); \
123 &(oreq)->r_ops[whch].typ.fld; \
124 })
125
126 static struct ceph_osd_data *
127 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
128 {
129 BUG_ON(which >= osd_req->r_num_ops);
130
131 return &osd_req->r_ops[which].raw_data_in;
132 }
133
134 struct ceph_osd_data *
135 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
136 unsigned int which)
137 {
138 return osd_req_op_data(osd_req, which, extent, osd_data);
139 }
140 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
141
142 struct ceph_osd_data *
143 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
144 unsigned int which)
145 {
146 return osd_req_op_data(osd_req, which, cls, response_data);
147 }
148 EXPORT_SYMBOL(osd_req_op_cls_response_data); /* ??? */
149
150 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
151 unsigned int which, struct page **pages,
152 u64 length, u32 alignment,
153 bool pages_from_pool, bool own_pages)
154 {
155 struct ceph_osd_data *osd_data;
156
157 osd_data = osd_req_op_raw_data_in(osd_req, which);
158 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
159 pages_from_pool, own_pages);
160 }
161 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
162
163 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
164 unsigned int which, struct page **pages,
165 u64 length, u32 alignment,
166 bool pages_from_pool, bool own_pages)
167 {
168 struct ceph_osd_data *osd_data;
169
170 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
171 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
172 pages_from_pool, own_pages);
173 }
174 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
175
176 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
177 unsigned int which, struct ceph_pagelist *pagelist)
178 {
179 struct ceph_osd_data *osd_data;
180
181 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
182 ceph_osd_data_pagelist_init(osd_data, pagelist);
183 }
184 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
185
186 #ifdef CONFIG_BLOCK
187 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
188 unsigned int which, struct bio *bio, size_t bio_length)
189 {
190 struct ceph_osd_data *osd_data;
191
192 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
193 ceph_osd_data_bio_init(osd_data, bio, bio_length);
194 }
195 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
196 #endif /* CONFIG_BLOCK */
197
198 static void osd_req_op_cls_request_info_pagelist(
199 struct ceph_osd_request *osd_req,
200 unsigned int which, struct ceph_pagelist *pagelist)
201 {
202 struct ceph_osd_data *osd_data;
203
204 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
205 ceph_osd_data_pagelist_init(osd_data, pagelist);
206 }
207
208 void osd_req_op_cls_request_data_pagelist(
209 struct ceph_osd_request *osd_req,
210 unsigned int which, struct ceph_pagelist *pagelist)
211 {
212 struct ceph_osd_data *osd_data;
213
214 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
215 ceph_osd_data_pagelist_init(osd_data, pagelist);
216 }
217 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
218
219 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
220 unsigned int which, struct page **pages, u64 length,
221 u32 alignment, bool pages_from_pool, bool own_pages)
222 {
223 struct ceph_osd_data *osd_data;
224
225 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
226 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
227 pages_from_pool, own_pages);
228 }
229 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
230
231 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
232 unsigned int which, struct page **pages, u64 length,
233 u32 alignment, bool pages_from_pool, bool own_pages)
234 {
235 struct ceph_osd_data *osd_data;
236
237 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
238 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
239 pages_from_pool, own_pages);
240 }
241 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
242
243 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
244 {
245 switch (osd_data->type) {
246 case CEPH_OSD_DATA_TYPE_NONE:
247 return 0;
248 case CEPH_OSD_DATA_TYPE_PAGES:
249 return osd_data->length;
250 case CEPH_OSD_DATA_TYPE_PAGELIST:
251 return (u64)osd_data->pagelist->length;
252 #ifdef CONFIG_BLOCK
253 case CEPH_OSD_DATA_TYPE_BIO:
254 return (u64)osd_data->bio_length;
255 #endif /* CONFIG_BLOCK */
256 default:
257 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
258 return 0;
259 }
260 }
261
262 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
263 {
264 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
265 int num_pages;
266
267 num_pages = calc_pages_for((u64)osd_data->alignment,
268 (u64)osd_data->length);
269 ceph_release_page_vector(osd_data->pages, num_pages);
270 }
271 ceph_osd_data_init(osd_data);
272 }
273
274 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
275 unsigned int which)
276 {
277 struct ceph_osd_req_op *op;
278
279 BUG_ON(which >= osd_req->r_num_ops);
280 op = &osd_req->r_ops[which];
281
282 switch (op->op) {
283 case CEPH_OSD_OP_READ:
284 case CEPH_OSD_OP_WRITE:
285 ceph_osd_data_release(&op->extent.osd_data);
286 break;
287 case CEPH_OSD_OP_CALL:
288 ceph_osd_data_release(&op->cls.request_info);
289 ceph_osd_data_release(&op->cls.request_data);
290 ceph_osd_data_release(&op->cls.response_data);
291 break;
292 default:
293 break;
294 }
295 }
296
297 /*
298 * requests
299 */
300 static void ceph_osdc_release_request(struct kref *kref)
301 {
302 struct ceph_osd_request *req = container_of(kref,
303 struct ceph_osd_request, r_kref);
304 unsigned int which;
305
306 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
307 req->r_request, req->r_reply);
308 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
309 WARN_ON(!list_empty(&req->r_req_lru_item));
310 WARN_ON(!list_empty(&req->r_osd_item));
311 WARN_ON(!list_empty(&req->r_linger_item));
312 WARN_ON(!list_empty(&req->r_linger_osd_item));
313 WARN_ON(req->r_osd);
314
315 if (req->r_request)
316 ceph_msg_put(req->r_request);
317 if (req->r_reply) {
318 ceph_msg_revoke_incoming(req->r_reply);
319 ceph_msg_put(req->r_reply);
320 }
321
322 for (which = 0; which < req->r_num_ops; which++)
323 osd_req_op_data_release(req, which);
324
325 ceph_put_snap_context(req->r_snapc);
326 if (req->r_mempool)
327 mempool_free(req, req->r_osdc->req_mempool);
328 else
329 kmem_cache_free(ceph_osd_request_cache, req);
330
331 }
332
333 void ceph_osdc_get_request(struct ceph_osd_request *req)
334 {
335 dout("%s %p (was %d)\n", __func__, req,
336 atomic_read(&req->r_kref.refcount));
337 kref_get(&req->r_kref);
338 }
339 EXPORT_SYMBOL(ceph_osdc_get_request);
340
341 void ceph_osdc_put_request(struct ceph_osd_request *req)
342 {
343 dout("%s %p (was %d)\n", __func__, req,
344 atomic_read(&req->r_kref.refcount));
345 kref_put(&req->r_kref, ceph_osdc_release_request);
346 }
347 EXPORT_SYMBOL(ceph_osdc_put_request);
348
349 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
350 struct ceph_snap_context *snapc,
351 unsigned int num_ops,
352 bool use_mempool,
353 gfp_t gfp_flags)
354 {
355 struct ceph_osd_request *req;
356 struct ceph_msg *msg;
357 size_t msg_size;
358
359 BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
360 BUG_ON(num_ops > CEPH_OSD_MAX_OP);
361
362 msg_size = 4 + 4 + 8 + 8 + 4+8;
363 msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
364 msg_size += 1 + 8 + 4 + 4; /* pg_t */
365 msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
366 msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
367 msg_size += 8; /* snapid */
368 msg_size += 8; /* snap_seq */
369 msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
370 msg_size += 4;
371
372 if (use_mempool) {
373 req = mempool_alloc(osdc->req_mempool, gfp_flags);
374 memset(req, 0, sizeof(*req));
375 } else {
376 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
377 }
378 if (req == NULL)
379 return NULL;
380
381 req->r_osdc = osdc;
382 req->r_mempool = use_mempool;
383 req->r_num_ops = num_ops;
384
385 kref_init(&req->r_kref);
386 init_completion(&req->r_completion);
387 init_completion(&req->r_safe_completion);
388 RB_CLEAR_NODE(&req->r_node);
389 INIT_LIST_HEAD(&req->r_unsafe_item);
390 INIT_LIST_HEAD(&req->r_linger_item);
391 INIT_LIST_HEAD(&req->r_linger_osd_item);
392 INIT_LIST_HEAD(&req->r_req_lru_item);
393 INIT_LIST_HEAD(&req->r_osd_item);
394
395 req->r_base_oloc.pool = -1;
396 req->r_target_oloc.pool = -1;
397
398 /* create reply message */
399 if (use_mempool)
400 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
401 else
402 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
403 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
404 if (!msg) {
405 ceph_osdc_put_request(req);
406 return NULL;
407 }
408 req->r_reply = msg;
409
410 /* create request message; allow space for oid */
411 if (use_mempool)
412 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
413 else
414 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
415 if (!msg) {
416 ceph_osdc_put_request(req);
417 return NULL;
418 }
419
420 memset(msg->front.iov_base, 0, msg->front.iov_len);
421
422 req->r_request = msg;
423
424 return req;
425 }
426 EXPORT_SYMBOL(ceph_osdc_alloc_request);
427
428 static bool osd_req_opcode_valid(u16 opcode)
429 {
430 switch (opcode) {
431 case CEPH_OSD_OP_READ:
432 case CEPH_OSD_OP_STAT:
433 case CEPH_OSD_OP_MAPEXT:
434 case CEPH_OSD_OP_MASKTRUNC:
435 case CEPH_OSD_OP_SPARSE_READ:
436 case CEPH_OSD_OP_NOTIFY:
437 case CEPH_OSD_OP_NOTIFY_ACK:
438 case CEPH_OSD_OP_ASSERT_VER:
439 case CEPH_OSD_OP_WRITE:
440 case CEPH_OSD_OP_WRITEFULL:
441 case CEPH_OSD_OP_TRUNCATE:
442 case CEPH_OSD_OP_ZERO:
443 case CEPH_OSD_OP_DELETE:
444 case CEPH_OSD_OP_APPEND:
445 case CEPH_OSD_OP_STARTSYNC:
446 case CEPH_OSD_OP_SETTRUNC:
447 case CEPH_OSD_OP_TRIMTRUNC:
448 case CEPH_OSD_OP_TMAPUP:
449 case CEPH_OSD_OP_TMAPPUT:
450 case CEPH_OSD_OP_TMAPGET:
451 case CEPH_OSD_OP_CREATE:
452 case CEPH_OSD_OP_ROLLBACK:
453 case CEPH_OSD_OP_WATCH:
454 case CEPH_OSD_OP_OMAPGETKEYS:
455 case CEPH_OSD_OP_OMAPGETVALS:
456 case CEPH_OSD_OP_OMAPGETHEADER:
457 case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
458 case CEPH_OSD_OP_OMAPSETVALS:
459 case CEPH_OSD_OP_OMAPSETHEADER:
460 case CEPH_OSD_OP_OMAPCLEAR:
461 case CEPH_OSD_OP_OMAPRMKEYS:
462 case CEPH_OSD_OP_OMAP_CMP:
463 case CEPH_OSD_OP_SETALLOCHINT:
464 case CEPH_OSD_OP_CLONERANGE:
465 case CEPH_OSD_OP_ASSERT_SRC_VERSION:
466 case CEPH_OSD_OP_SRC_CMPXATTR:
467 case CEPH_OSD_OP_GETXATTR:
468 case CEPH_OSD_OP_GETXATTRS:
469 case CEPH_OSD_OP_CMPXATTR:
470 case CEPH_OSD_OP_SETXATTR:
471 case CEPH_OSD_OP_SETXATTRS:
472 case CEPH_OSD_OP_RESETXATTRS:
473 case CEPH_OSD_OP_RMXATTR:
474 case CEPH_OSD_OP_PULL:
475 case CEPH_OSD_OP_PUSH:
476 case CEPH_OSD_OP_BALANCEREADS:
477 case CEPH_OSD_OP_UNBALANCEREADS:
478 case CEPH_OSD_OP_SCRUB:
479 case CEPH_OSD_OP_SCRUB_RESERVE:
480 case CEPH_OSD_OP_SCRUB_UNRESERVE:
481 case CEPH_OSD_OP_SCRUB_STOP:
482 case CEPH_OSD_OP_SCRUB_MAP:
483 case CEPH_OSD_OP_WRLOCK:
484 case CEPH_OSD_OP_WRUNLOCK:
485 case CEPH_OSD_OP_RDLOCK:
486 case CEPH_OSD_OP_RDUNLOCK:
487 case CEPH_OSD_OP_UPLOCK:
488 case CEPH_OSD_OP_DNLOCK:
489 case CEPH_OSD_OP_CALL:
490 case CEPH_OSD_OP_PGLS:
491 case CEPH_OSD_OP_PGLS_FILTER:
492 return true;
493 default:
494 return false;
495 }
496 }
497
498 /*
499 * This is an osd op init function for opcodes that have no data or
500 * other information associated with them. It also serves as a
501 * common init routine for all the other init functions, below.
502 */
503 static struct ceph_osd_req_op *
504 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
505 u16 opcode)
506 {
507 struct ceph_osd_req_op *op;
508
509 BUG_ON(which >= osd_req->r_num_ops);
510 BUG_ON(!osd_req_opcode_valid(opcode));
511
512 op = &osd_req->r_ops[which];
513 memset(op, 0, sizeof (*op));
514 op->op = opcode;
515
516 return op;
517 }
518
519 void osd_req_op_init(struct ceph_osd_request *osd_req,
520 unsigned int which, u16 opcode)
521 {
522 (void)_osd_req_op_init(osd_req, which, opcode);
523 }
524 EXPORT_SYMBOL(osd_req_op_init);
525
526 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
527 unsigned int which, u16 opcode,
528 u64 offset, u64 length,
529 u64 truncate_size, u32 truncate_seq)
530 {
531 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
532 size_t payload_len = 0;
533
534 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
535 opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
536 opcode != CEPH_OSD_OP_TRUNCATE);
537
538 op->extent.offset = offset;
539 op->extent.length = length;
540 op->extent.truncate_size = truncate_size;
541 op->extent.truncate_seq = truncate_seq;
542 if (opcode == CEPH_OSD_OP_WRITE)
543 payload_len += length;
544
545 op->payload_len = payload_len;
546 }
547 EXPORT_SYMBOL(osd_req_op_extent_init);
548
549 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
550 unsigned int which, u64 length)
551 {
552 struct ceph_osd_req_op *op;
553 u64 previous;
554
555 BUG_ON(which >= osd_req->r_num_ops);
556 op = &osd_req->r_ops[which];
557 previous = op->extent.length;
558
559 if (length == previous)
560 return; /* Nothing to do */
561 BUG_ON(length > previous);
562
563 op->extent.length = length;
564 op->payload_len -= previous - length;
565 }
566 EXPORT_SYMBOL(osd_req_op_extent_update);
567
568 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
569 u16 opcode, const char *class, const char *method)
570 {
571 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
572 struct ceph_pagelist *pagelist;
573 size_t payload_len = 0;
574 size_t size;
575
576 BUG_ON(opcode != CEPH_OSD_OP_CALL);
577
578 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
579 BUG_ON(!pagelist);
580 ceph_pagelist_init(pagelist);
581
582 op->cls.class_name = class;
583 size = strlen(class);
584 BUG_ON(size > (size_t) U8_MAX);
585 op->cls.class_len = size;
586 ceph_pagelist_append(pagelist, class, size);
587 payload_len += size;
588
589 op->cls.method_name = method;
590 size = strlen(method);
591 BUG_ON(size > (size_t) U8_MAX);
592 op->cls.method_len = size;
593 ceph_pagelist_append(pagelist, method, size);
594 payload_len += size;
595
596 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
597
598 op->cls.argc = 0; /* currently unused */
599
600 op->payload_len = payload_len;
601 }
602 EXPORT_SYMBOL(osd_req_op_cls_init);
603
604 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
605 unsigned int which, u16 opcode,
606 u64 cookie, u64 version, int flag)
607 {
608 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
609
610 BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
611
612 op->watch.cookie = cookie;
613 op->watch.ver = version;
614 if (opcode == CEPH_OSD_OP_WATCH && flag)
615 op->watch.flag = (u8)1;
616 }
617 EXPORT_SYMBOL(osd_req_op_watch_init);
618
619 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
620 unsigned int which,
621 u64 expected_object_size,
622 u64 expected_write_size)
623 {
624 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
625 CEPH_OSD_OP_SETALLOCHINT);
626
627 op->alloc_hint.expected_object_size = expected_object_size;
628 op->alloc_hint.expected_write_size = expected_write_size;
629
630 /*
631 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
632 * not worth a feature bit. Set FAILOK per-op flag to make
633 * sure older osds don't trip over an unsupported opcode.
634 */
635 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
636 }
637 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
638
639 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
640 struct ceph_osd_data *osd_data)
641 {
642 u64 length = ceph_osd_data_length(osd_data);
643
644 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
645 BUG_ON(length > (u64) SIZE_MAX);
646 if (length)
647 ceph_msg_data_add_pages(msg, osd_data->pages,
648 length, osd_data->alignment);
649 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
650 BUG_ON(!length);
651 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
652 #ifdef CONFIG_BLOCK
653 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
654 ceph_msg_data_add_bio(msg, osd_data->bio, length);
655 #endif
656 } else {
657 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
658 }
659 }
660
661 static u64 osd_req_encode_op(struct ceph_osd_request *req,
662 struct ceph_osd_op *dst, unsigned int which)
663 {
664 struct ceph_osd_req_op *src;
665 struct ceph_osd_data *osd_data;
666 u64 request_data_len = 0;
667 u64 data_length;
668
669 BUG_ON(which >= req->r_num_ops);
670 src = &req->r_ops[which];
671 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
672 pr_err("unrecognized osd opcode %d\n", src->op);
673
674 return 0;
675 }
676
677 switch (src->op) {
678 case CEPH_OSD_OP_STAT:
679 osd_data = &src->raw_data_in;
680 ceph_osdc_msg_data_add(req->r_reply, osd_data);
681 break;
682 case CEPH_OSD_OP_READ:
683 case CEPH_OSD_OP_WRITE:
684 case CEPH_OSD_OP_ZERO:
685 case CEPH_OSD_OP_DELETE:
686 case CEPH_OSD_OP_TRUNCATE:
687 if (src->op == CEPH_OSD_OP_WRITE)
688 request_data_len = src->extent.length;
689 dst->extent.offset = cpu_to_le64(src->extent.offset);
690 dst->extent.length = cpu_to_le64(src->extent.length);
691 dst->extent.truncate_size =
692 cpu_to_le64(src->extent.truncate_size);
693 dst->extent.truncate_seq =
694 cpu_to_le32(src->extent.truncate_seq);
695 osd_data = &src->extent.osd_data;
696 if (src->op == CEPH_OSD_OP_WRITE)
697 ceph_osdc_msg_data_add(req->r_request, osd_data);
698 else
699 ceph_osdc_msg_data_add(req->r_reply, osd_data);
700 break;
701 case CEPH_OSD_OP_CALL:
702 dst->cls.class_len = src->cls.class_len;
703 dst->cls.method_len = src->cls.method_len;
704 osd_data = &src->cls.request_info;
705 ceph_osdc_msg_data_add(req->r_request, osd_data);
706 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
707 request_data_len = osd_data->pagelist->length;
708
709 osd_data = &src->cls.request_data;
710 data_length = ceph_osd_data_length(osd_data);
711 if (data_length) {
712 BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
713 dst->cls.indata_len = cpu_to_le32(data_length);
714 ceph_osdc_msg_data_add(req->r_request, osd_data);
715 src->payload_len += data_length;
716 request_data_len += data_length;
717 }
718 osd_data = &src->cls.response_data;
719 ceph_osdc_msg_data_add(req->r_reply, osd_data);
720 break;
721 case CEPH_OSD_OP_STARTSYNC:
722 break;
723 case CEPH_OSD_OP_NOTIFY_ACK:
724 case CEPH_OSD_OP_WATCH:
725 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
726 dst->watch.ver = cpu_to_le64(src->watch.ver);
727 dst->watch.flag = src->watch.flag;
728 break;
729 case CEPH_OSD_OP_SETALLOCHINT:
730 dst->alloc_hint.expected_object_size =
731 cpu_to_le64(src->alloc_hint.expected_object_size);
732 dst->alloc_hint.expected_write_size =
733 cpu_to_le64(src->alloc_hint.expected_write_size);
734 break;
735 default:
736 pr_err("unsupported osd opcode %s\n",
737 ceph_osd_op_name(src->op));
738 WARN_ON(1);
739
740 return 0;
741 }
742
743 dst->op = cpu_to_le16(src->op);
744 dst->flags = cpu_to_le32(src->flags);
745 dst->payload_len = cpu_to_le32(src->payload_len);
746
747 return request_data_len;
748 }
749
750 /*
751 * build new request AND message, calculate layout, and adjust file
752 * extent as needed.
753 *
754 * if the file was recently truncated, we include information about its
755 * old and new size so that the object can be updated appropriately. (we
756 * avoid synchronously deleting truncated objects because it's slow.)
757 *
758 * if @do_sync, include a 'startsync' command so that the osd will flush
759 * data quickly.
760 */
761 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
762 struct ceph_file_layout *layout,
763 struct ceph_vino vino,
764 u64 off, u64 *plen, int num_ops,
765 int opcode, int flags,
766 struct ceph_snap_context *snapc,
767 u32 truncate_seq,
768 u64 truncate_size,
769 bool use_mempool)
770 {
771 struct ceph_osd_request *req;
772 u64 objnum = 0;
773 u64 objoff = 0;
774 u64 objlen = 0;
775 u32 object_size;
776 u64 object_base;
777 int r;
778
779 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
780 opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
781 opcode != CEPH_OSD_OP_TRUNCATE);
782
783 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
784 GFP_NOFS);
785 if (!req)
786 return ERR_PTR(-ENOMEM);
787
788 req->r_flags = flags;
789
790 /* calculate max write size */
791 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
792 if (r < 0) {
793 ceph_osdc_put_request(req);
794 return ERR_PTR(r);
795 }
796
797 object_size = le32_to_cpu(layout->fl_object_size);
798 object_base = off - objoff;
799 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
800 if (truncate_size <= object_base) {
801 truncate_size = 0;
802 } else {
803 truncate_size -= object_base;
804 if (truncate_size > object_size)
805 truncate_size = object_size;
806 }
807 }
808
809 osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
810 truncate_size, truncate_seq);
811
812 /*
813 * A second op in the ops array means the caller wants to
814 * also issue a include a 'startsync' command so that the
815 * osd will flush data quickly.
816 */
817 if (num_ops > 1)
818 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
819
820 req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
821
822 snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
823 "%llx.%08llx", vino.ino, objnum);
824 req->r_base_oid.name_len = strlen(req->r_base_oid.name);
825
826 return req;
827 }
828 EXPORT_SYMBOL(ceph_osdc_new_request);
829
830 /*
831 * We keep osd requests in an rbtree, sorted by ->r_tid.
832 */
833 static void __insert_request(struct ceph_osd_client *osdc,
834 struct ceph_osd_request *new)
835 {
836 struct rb_node **p = &osdc->requests.rb_node;
837 struct rb_node *parent = NULL;
838 struct ceph_osd_request *req = NULL;
839
840 while (*p) {
841 parent = *p;
842 req = rb_entry(parent, struct ceph_osd_request, r_node);
843 if (new->r_tid < req->r_tid)
844 p = &(*p)->rb_left;
845 else if (new->r_tid > req->r_tid)
846 p = &(*p)->rb_right;
847 else
848 BUG();
849 }
850
851 rb_link_node(&new->r_node, parent, p);
852 rb_insert_color(&new->r_node, &osdc->requests);
853 }
854
855 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
856 u64 tid)
857 {
858 struct ceph_osd_request *req;
859 struct rb_node *n = osdc->requests.rb_node;
860
861 while (n) {
862 req = rb_entry(n, struct ceph_osd_request, r_node);
863 if (tid < req->r_tid)
864 n = n->rb_left;
865 else if (tid > req->r_tid)
866 n = n->rb_right;
867 else
868 return req;
869 }
870 return NULL;
871 }
872
873 static struct ceph_osd_request *
874 __lookup_request_ge(struct ceph_osd_client *osdc,
875 u64 tid)
876 {
877 struct ceph_osd_request *req;
878 struct rb_node *n = osdc->requests.rb_node;
879
880 while (n) {
881 req = rb_entry(n, struct ceph_osd_request, r_node);
882 if (tid < req->r_tid) {
883 if (!n->rb_left)
884 return req;
885 n = n->rb_left;
886 } else if (tid > req->r_tid) {
887 n = n->rb_right;
888 } else {
889 return req;
890 }
891 }
892 return NULL;
893 }
894
895 /*
896 * Resubmit requests pending on the given osd.
897 */
898 static void __kick_osd_requests(struct ceph_osd_client *osdc,
899 struct ceph_osd *osd)
900 {
901 struct ceph_osd_request *req, *nreq;
902 LIST_HEAD(resend);
903 int err;
904
905 dout("__kick_osd_requests osd%d\n", osd->o_osd);
906 err = __reset_osd(osdc, osd);
907 if (err)
908 return;
909 /*
910 * Build up a list of requests to resend by traversing the
911 * osd's list of requests. Requests for a given object are
912 * sent in tid order, and that is also the order they're
913 * kept on this list. Therefore all requests that are in
914 * flight will be found first, followed by all requests that
915 * have not yet been sent. And to resend requests while
916 * preserving this order we will want to put any sent
917 * requests back on the front of the osd client's unsent
918 * list.
919 *
920 * So we build a separate ordered list of already-sent
921 * requests for the affected osd and splice it onto the
922 * front of the osd client's unsent list. Once we've seen a
923 * request that has not yet been sent we're done. Those
924 * requests are already sitting right where they belong.
925 */
926 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
927 if (!req->r_sent)
928 break;
929 list_move_tail(&req->r_req_lru_item, &resend);
930 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
931 osd->o_osd);
932 if (!req->r_linger)
933 req->r_flags |= CEPH_OSD_FLAG_RETRY;
934 }
935 list_splice(&resend, &osdc->req_unsent);
936
937 /*
938 * Linger requests are re-registered before sending, which
939 * sets up a new tid for each. We add them to the unsent
940 * list at the end to keep things in tid order.
941 */
942 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
943 r_linger_osd_item) {
944 /*
945 * reregister request prior to unregistering linger so
946 * that r_osd is preserved.
947 */
948 BUG_ON(!list_empty(&req->r_req_lru_item));
949 __register_request(osdc, req);
950 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
951 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
952 __unregister_linger_request(osdc, req);
953 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
954 osd->o_osd);
955 }
956 }
957
958 /*
959 * If the osd connection drops, we need to resubmit all requests.
960 */
961 static void osd_reset(struct ceph_connection *con)
962 {
963 struct ceph_osd *osd = con->private;
964 struct ceph_osd_client *osdc;
965
966 if (!osd)
967 return;
968 dout("osd_reset osd%d\n", osd->o_osd);
969 osdc = osd->o_osdc;
970 down_read(&osdc->map_sem);
971 mutex_lock(&osdc->request_mutex);
972 __kick_osd_requests(osdc, osd);
973 __send_queued(osdc);
974 mutex_unlock(&osdc->request_mutex);
975 up_read(&osdc->map_sem);
976 }
977
978 /*
979 * Track open sessions with osds.
980 */
981 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
982 {
983 struct ceph_osd *osd;
984
985 osd = kzalloc(sizeof(*osd), GFP_NOFS);
986 if (!osd)
987 return NULL;
988
989 atomic_set(&osd->o_ref, 1);
990 osd->o_osdc = osdc;
991 osd->o_osd = onum;
992 RB_CLEAR_NODE(&osd->o_node);
993 INIT_LIST_HEAD(&osd->o_requests);
994 INIT_LIST_HEAD(&osd->o_linger_requests);
995 INIT_LIST_HEAD(&osd->o_osd_lru);
996 osd->o_incarnation = 1;
997
998 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
999
1000 INIT_LIST_HEAD(&osd->o_keepalive_item);
1001 return osd;
1002 }
1003
1004 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1005 {
1006 if (atomic_inc_not_zero(&osd->o_ref)) {
1007 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1008 atomic_read(&osd->o_ref));
1009 return osd;
1010 } else {
1011 dout("get_osd %p FAIL\n", osd);
1012 return NULL;
1013 }
1014 }
1015
1016 static void put_osd(struct ceph_osd *osd)
1017 {
1018 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1019 atomic_read(&osd->o_ref) - 1);
1020 if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
1021 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1022
1023 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1024 kfree(osd);
1025 }
1026 }
1027
1028 /*
1029 * remove an osd from our map
1030 */
1031 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1032 {
1033 dout("__remove_osd %p\n", osd);
1034 BUG_ON(!list_empty(&osd->o_requests));
1035 BUG_ON(!list_empty(&osd->o_linger_requests));
1036
1037 rb_erase(&osd->o_node, &osdc->osds);
1038 list_del_init(&osd->o_osd_lru);
1039 ceph_con_close(&osd->o_con);
1040 put_osd(osd);
1041 }
1042
1043 static void remove_all_osds(struct ceph_osd_client *osdc)
1044 {
1045 dout("%s %p\n", __func__, osdc);
1046 mutex_lock(&osdc->request_mutex);
1047 while (!RB_EMPTY_ROOT(&osdc->osds)) {
1048 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1049 struct ceph_osd, o_node);
1050 __remove_osd(osdc, osd);
1051 }
1052 mutex_unlock(&osdc->request_mutex);
1053 }
1054
1055 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1056 struct ceph_osd *osd)
1057 {
1058 dout("%s %p\n", __func__, osd);
1059 BUG_ON(!list_empty(&osd->o_osd_lru));
1060
1061 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1062 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1063 }
1064
1065 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1066 struct ceph_osd *osd)
1067 {
1068 dout("%s %p\n", __func__, osd);
1069
1070 if (list_empty(&osd->o_requests) &&
1071 list_empty(&osd->o_linger_requests))
1072 __move_osd_to_lru(osdc, osd);
1073 }
1074
1075 static void __remove_osd_from_lru(struct ceph_osd *osd)
1076 {
1077 dout("__remove_osd_from_lru %p\n", osd);
1078 if (!list_empty(&osd->o_osd_lru))
1079 list_del_init(&osd->o_osd_lru);
1080 }
1081
1082 static void remove_old_osds(struct ceph_osd_client *osdc)
1083 {
1084 struct ceph_osd *osd, *nosd;
1085
1086 dout("__remove_old_osds %p\n", osdc);
1087 mutex_lock(&osdc->request_mutex);
1088 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1089 if (time_before(jiffies, osd->lru_ttl))
1090 break;
1091 __remove_osd(osdc, osd);
1092 }
1093 mutex_unlock(&osdc->request_mutex);
1094 }
1095
1096 /*
1097 * reset osd connect
1098 */
1099 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1100 {
1101 struct ceph_entity_addr *peer_addr;
1102
1103 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1104 if (list_empty(&osd->o_requests) &&
1105 list_empty(&osd->o_linger_requests)) {
1106 __remove_osd(osdc, osd);
1107
1108 return -ENODEV;
1109 }
1110
1111 peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1112 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1113 !ceph_con_opened(&osd->o_con)) {
1114 struct ceph_osd_request *req;
1115
1116 dout("osd addr hasn't changed and connection never opened, "
1117 "letting msgr retry\n");
1118 /* touch each r_stamp for handle_timeout()'s benfit */
1119 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1120 req->r_stamp = jiffies;
1121
1122 return -EAGAIN;
1123 }
1124
1125 ceph_con_close(&osd->o_con);
1126 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1127 osd->o_incarnation++;
1128
1129 return 0;
1130 }
1131
1132 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1133 {
1134 struct rb_node **p = &osdc->osds.rb_node;
1135 struct rb_node *parent = NULL;
1136 struct ceph_osd *osd = NULL;
1137
1138 dout("__insert_osd %p osd%d\n", new, new->o_osd);
1139 while (*p) {
1140 parent = *p;
1141 osd = rb_entry(parent, struct ceph_osd, o_node);
1142 if (new->o_osd < osd->o_osd)
1143 p = &(*p)->rb_left;
1144 else if (new->o_osd > osd->o_osd)
1145 p = &(*p)->rb_right;
1146 else
1147 BUG();
1148 }
1149
1150 rb_link_node(&new->o_node, parent, p);
1151 rb_insert_color(&new->o_node, &osdc->osds);
1152 }
1153
1154 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1155 {
1156 struct ceph_osd *osd;
1157 struct rb_node *n = osdc->osds.rb_node;
1158
1159 while (n) {
1160 osd = rb_entry(n, struct ceph_osd, o_node);
1161 if (o < osd->o_osd)
1162 n = n->rb_left;
1163 else if (o > osd->o_osd)
1164 n = n->rb_right;
1165 else
1166 return osd;
1167 }
1168 return NULL;
1169 }
1170
1171 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1172 {
1173 schedule_delayed_work(&osdc->timeout_work,
1174 osdc->client->options->osd_keepalive_timeout * HZ);
1175 }
1176
1177 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1178 {
1179 cancel_delayed_work(&osdc->timeout_work);
1180 }
1181
1182 /*
1183 * Register request, assign tid. If this is the first request, set up
1184 * the timeout event.
1185 */
1186 static void __register_request(struct ceph_osd_client *osdc,
1187 struct ceph_osd_request *req)
1188 {
1189 req->r_tid = ++osdc->last_tid;
1190 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1191 dout("__register_request %p tid %lld\n", req, req->r_tid);
1192 __insert_request(osdc, req);
1193 ceph_osdc_get_request(req);
1194 osdc->num_requests++;
1195 if (osdc->num_requests == 1) {
1196 dout(" first request, scheduling timeout\n");
1197 __schedule_osd_timeout(osdc);
1198 }
1199 }
1200
1201 /*
1202 * called under osdc->request_mutex
1203 */
1204 static void __unregister_request(struct ceph_osd_client *osdc,
1205 struct ceph_osd_request *req)
1206 {
1207 if (RB_EMPTY_NODE(&req->r_node)) {
1208 dout("__unregister_request %p tid %lld not registered\n",
1209 req, req->r_tid);
1210 return;
1211 }
1212
1213 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1214 rb_erase(&req->r_node, &osdc->requests);
1215 RB_CLEAR_NODE(&req->r_node);
1216 osdc->num_requests--;
1217
1218 if (req->r_osd) {
1219 /* make sure the original request isn't in flight. */
1220 ceph_msg_revoke(req->r_request);
1221
1222 list_del_init(&req->r_osd_item);
1223 maybe_move_osd_to_lru(osdc, req->r_osd);
1224 if (list_empty(&req->r_linger_osd_item))
1225 req->r_osd = NULL;
1226 }
1227
1228 list_del_init(&req->r_req_lru_item);
1229 ceph_osdc_put_request(req);
1230
1231 if (osdc->num_requests == 0) {
1232 dout(" no requests, canceling timeout\n");
1233 __cancel_osd_timeout(osdc);
1234 }
1235 }
1236
1237 /*
1238 * Cancel a previously queued request message
1239 */
1240 static void __cancel_request(struct ceph_osd_request *req)
1241 {
1242 if (req->r_sent && req->r_osd) {
1243 ceph_msg_revoke(req->r_request);
1244 req->r_sent = 0;
1245 }
1246 }
1247
1248 static void __register_linger_request(struct ceph_osd_client *osdc,
1249 struct ceph_osd_request *req)
1250 {
1251 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1252 WARN_ON(!req->r_linger);
1253
1254 ceph_osdc_get_request(req);
1255 list_add_tail(&req->r_linger_item, &osdc->req_linger);
1256 if (req->r_osd)
1257 list_add_tail(&req->r_linger_osd_item,
1258 &req->r_osd->o_linger_requests);
1259 }
1260
1261 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1262 struct ceph_osd_request *req)
1263 {
1264 WARN_ON(!req->r_linger);
1265
1266 if (list_empty(&req->r_linger_item)) {
1267 dout("%s %p tid %llu not registered\n", __func__, req,
1268 req->r_tid);
1269 return;
1270 }
1271
1272 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1273 list_del_init(&req->r_linger_item);
1274
1275 if (req->r_osd) {
1276 list_del_init(&req->r_linger_osd_item);
1277 maybe_move_osd_to_lru(osdc, req->r_osd);
1278 if (list_empty(&req->r_osd_item))
1279 req->r_osd = NULL;
1280 }
1281 ceph_osdc_put_request(req);
1282 }
1283
1284 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1285 struct ceph_osd_request *req)
1286 {
1287 if (!req->r_linger) {
1288 dout("set_request_linger %p\n", req);
1289 req->r_linger = 1;
1290 }
1291 }
1292 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1293
1294 /*
1295 * Returns whether a request should be blocked from being sent
1296 * based on the current osdmap and osd_client settings.
1297 *
1298 * Caller should hold map_sem for read.
1299 */
1300 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1301 struct ceph_osd_request *req)
1302 {
1303 bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1304 bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1305 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1306 return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1307 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1308 }
1309
1310 /*
1311 * Calculate mapping of a request to a PG. Takes tiering into account.
1312 */
1313 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1314 struct ceph_osd_request *req,
1315 struct ceph_pg *pg_out)
1316 {
1317 bool need_check_tiering;
1318
1319 need_check_tiering = false;
1320 if (req->r_target_oloc.pool == -1) {
1321 req->r_target_oloc = req->r_base_oloc; /* struct */
1322 need_check_tiering = true;
1323 }
1324 if (req->r_target_oid.name_len == 0) {
1325 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1326 need_check_tiering = true;
1327 }
1328
1329 if (need_check_tiering &&
1330 (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1331 struct ceph_pg_pool_info *pi;
1332
1333 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1334 if (pi) {
1335 if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1336 pi->read_tier >= 0)
1337 req->r_target_oloc.pool = pi->read_tier;
1338 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1339 pi->write_tier >= 0)
1340 req->r_target_oloc.pool = pi->write_tier;
1341 }
1342 /* !pi is caught in ceph_oloc_oid_to_pg() */
1343 }
1344
1345 return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1346 &req->r_target_oid, pg_out);
1347 }
1348
1349 /*
1350 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1351 * (as needed), and set the request r_osd appropriately. If there is
1352 * no up osd, set r_osd to NULL. Move the request to the appropriate list
1353 * (unsent, homeless) or leave on in-flight lru.
1354 *
1355 * Return 0 if unchanged, 1 if changed, or negative on error.
1356 *
1357 * Caller should hold map_sem for read and request_mutex.
1358 */
1359 static int __map_request(struct ceph_osd_client *osdc,
1360 struct ceph_osd_request *req, int force_resend)
1361 {
1362 struct ceph_pg pgid;
1363 int acting[CEPH_PG_MAX_SIZE];
1364 int num, o;
1365 int err;
1366 bool was_paused;
1367
1368 dout("map_request %p tid %lld\n", req, req->r_tid);
1369
1370 err = __calc_request_pg(osdc->osdmap, req, &pgid);
1371 if (err) {
1372 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1373 return err;
1374 }
1375 req->r_pgid = pgid;
1376
1377 num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1378 if (num < 0)
1379 num = 0;
1380
1381 was_paused = req->r_paused;
1382 req->r_paused = __req_should_be_paused(osdc, req);
1383 if (was_paused && !req->r_paused)
1384 force_resend = 1;
1385
1386 if ((!force_resend &&
1387 req->r_osd && req->r_osd->o_osd == o &&
1388 req->r_sent >= req->r_osd->o_incarnation &&
1389 req->r_num_pg_osds == num &&
1390 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1391 (req->r_osd == NULL && o == -1) ||
1392 req->r_paused)
1393 return 0; /* no change */
1394
1395 dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1396 req->r_tid, pgid.pool, pgid.seed, o,
1397 req->r_osd ? req->r_osd->o_osd : -1);
1398
1399 /* record full pg acting set */
1400 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1401 req->r_num_pg_osds = num;
1402
1403 if (req->r_osd) {
1404 __cancel_request(req);
1405 list_del_init(&req->r_osd_item);
1406 req->r_osd = NULL;
1407 }
1408
1409 req->r_osd = __lookup_osd(osdc, o);
1410 if (!req->r_osd && o >= 0) {
1411 err = -ENOMEM;
1412 req->r_osd = create_osd(osdc, o);
1413 if (!req->r_osd) {
1414 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1415 goto out;
1416 }
1417
1418 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1419 __insert_osd(osdc, req->r_osd);
1420
1421 ceph_con_open(&req->r_osd->o_con,
1422 CEPH_ENTITY_TYPE_OSD, o,
1423 &osdc->osdmap->osd_addr[o]);
1424 }
1425
1426 if (req->r_osd) {
1427 __remove_osd_from_lru(req->r_osd);
1428 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1429 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1430 } else {
1431 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1432 }
1433 err = 1; /* osd or pg changed */
1434
1435 out:
1436 return err;
1437 }
1438
1439 /*
1440 * caller should hold map_sem (for read) and request_mutex
1441 */
1442 static void __send_request(struct ceph_osd_client *osdc,
1443 struct ceph_osd_request *req)
1444 {
1445 void *p;
1446
1447 dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1448 req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1449 (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1450
1451 /* fill in message content that changes each time we send it */
1452 put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1453 put_unaligned_le32(req->r_flags, req->r_request_flags);
1454 put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1455 p = req->r_request_pgid;
1456 ceph_encode_64(&p, req->r_pgid.pool);
1457 ceph_encode_32(&p, req->r_pgid.seed);
1458 put_unaligned_le64(1, req->r_request_attempts); /* FIXME */
1459 memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1460 sizeof(req->r_reassert_version));
1461
1462 req->r_stamp = jiffies;
1463 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1464
1465 ceph_msg_get(req->r_request); /* send consumes a ref */
1466
1467 req->r_sent = req->r_osd->o_incarnation;
1468
1469 ceph_con_send(&req->r_osd->o_con, req->r_request);
1470 }
1471
1472 /*
1473 * Send any requests in the queue (req_unsent).
1474 */
1475 static void __send_queued(struct ceph_osd_client *osdc)
1476 {
1477 struct ceph_osd_request *req, *tmp;
1478
1479 dout("__send_queued\n");
1480 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1481 __send_request(osdc, req);
1482 }
1483
1484 /*
1485 * Caller should hold map_sem for read and request_mutex.
1486 */
1487 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1488 struct ceph_osd_request *req,
1489 bool nofail)
1490 {
1491 int rc;
1492
1493 __register_request(osdc, req);
1494 req->r_sent = 0;
1495 req->r_got_reply = 0;
1496 rc = __map_request(osdc, req, 0);
1497 if (rc < 0) {
1498 if (nofail) {
1499 dout("osdc_start_request failed map, "
1500 " will retry %lld\n", req->r_tid);
1501 rc = 0;
1502 } else {
1503 __unregister_request(osdc, req);
1504 }
1505 return rc;
1506 }
1507
1508 if (req->r_osd == NULL) {
1509 dout("send_request %p no up osds in pg\n", req);
1510 ceph_monc_request_next_osdmap(&osdc->client->monc);
1511 } else {
1512 __send_queued(osdc);
1513 }
1514
1515 return 0;
1516 }
1517
1518 /*
1519 * Timeout callback, called every N seconds when 1 or more osd
1520 * requests has been active for more than N seconds. When this
1521 * happens, we ping all OSDs with requests who have timed out to
1522 * ensure any communications channel reset is detected. Reset the
1523 * request timeouts another N seconds in the future as we go.
1524 * Reschedule the timeout event another N seconds in future (unless
1525 * there are no open requests).
1526 */
1527 static void handle_timeout(struct work_struct *work)
1528 {
1529 struct ceph_osd_client *osdc =
1530 container_of(work, struct ceph_osd_client, timeout_work.work);
1531 struct ceph_osd_request *req;
1532 struct ceph_osd *osd;
1533 unsigned long keepalive =
1534 osdc->client->options->osd_keepalive_timeout * HZ;
1535 struct list_head slow_osds;
1536 dout("timeout\n");
1537 down_read(&osdc->map_sem);
1538
1539 ceph_monc_request_next_osdmap(&osdc->client->monc);
1540
1541 mutex_lock(&osdc->request_mutex);
1542
1543 /*
1544 * ping osds that are a bit slow. this ensures that if there
1545 * is a break in the TCP connection we will notice, and reopen
1546 * a connection with that osd (from the fault callback).
1547 */
1548 INIT_LIST_HEAD(&slow_osds);
1549 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1550 if (time_before(jiffies, req->r_stamp + keepalive))
1551 break;
1552
1553 osd = req->r_osd;
1554 BUG_ON(!osd);
1555 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1556 req->r_tid, osd->o_osd);
1557 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1558 }
1559 while (!list_empty(&slow_osds)) {
1560 osd = list_entry(slow_osds.next, struct ceph_osd,
1561 o_keepalive_item);
1562 list_del_init(&osd->o_keepalive_item);
1563 ceph_con_keepalive(&osd->o_con);
1564 }
1565
1566 __schedule_osd_timeout(osdc);
1567 __send_queued(osdc);
1568 mutex_unlock(&osdc->request_mutex);
1569 up_read(&osdc->map_sem);
1570 }
1571
1572 static void handle_osds_timeout(struct work_struct *work)
1573 {
1574 struct ceph_osd_client *osdc =
1575 container_of(work, struct ceph_osd_client,
1576 osds_timeout_work.work);
1577 unsigned long delay =
1578 osdc->client->options->osd_idle_ttl * HZ >> 2;
1579
1580 dout("osds timeout\n");
1581 down_read(&osdc->map_sem);
1582 remove_old_osds(osdc);
1583 up_read(&osdc->map_sem);
1584
1585 schedule_delayed_work(&osdc->osds_timeout_work,
1586 round_jiffies_relative(delay));
1587 }
1588
1589 static int ceph_oloc_decode(void **p, void *end,
1590 struct ceph_object_locator *oloc)
1591 {
1592 u8 struct_v, struct_cv;
1593 u32 len;
1594 void *struct_end;
1595 int ret = 0;
1596
1597 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1598 struct_v = ceph_decode_8(p);
1599 struct_cv = ceph_decode_8(p);
1600 if (struct_v < 3) {
1601 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1602 struct_v, struct_cv);
1603 goto e_inval;
1604 }
1605 if (struct_cv > 6) {
1606 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1607 struct_v, struct_cv);
1608 goto e_inval;
1609 }
1610 len = ceph_decode_32(p);
1611 ceph_decode_need(p, end, len, e_inval);
1612 struct_end = *p + len;
1613
1614 oloc->pool = ceph_decode_64(p);
1615 *p += 4; /* skip preferred */
1616
1617 len = ceph_decode_32(p);
1618 if (len > 0) {
1619 pr_warn("ceph_object_locator::key is set\n");
1620 goto e_inval;
1621 }
1622
1623 if (struct_v >= 5) {
1624 len = ceph_decode_32(p);
1625 if (len > 0) {
1626 pr_warn("ceph_object_locator::nspace is set\n");
1627 goto e_inval;
1628 }
1629 }
1630
1631 if (struct_v >= 6) {
1632 s64 hash = ceph_decode_64(p);
1633 if (hash != -1) {
1634 pr_warn("ceph_object_locator::hash is set\n");
1635 goto e_inval;
1636 }
1637 }
1638
1639 /* skip the rest */
1640 *p = struct_end;
1641 out:
1642 return ret;
1643
1644 e_inval:
1645 ret = -EINVAL;
1646 goto out;
1647 }
1648
1649 static int ceph_redirect_decode(void **p, void *end,
1650 struct ceph_request_redirect *redir)
1651 {
1652 u8 struct_v, struct_cv;
1653 u32 len;
1654 void *struct_end;
1655 int ret;
1656
1657 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1658 struct_v = ceph_decode_8(p);
1659 struct_cv = ceph_decode_8(p);
1660 if (struct_cv > 1) {
1661 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1662 struct_v, struct_cv);
1663 goto e_inval;
1664 }
1665 len = ceph_decode_32(p);
1666 ceph_decode_need(p, end, len, e_inval);
1667 struct_end = *p + len;
1668
1669 ret = ceph_oloc_decode(p, end, &redir->oloc);
1670 if (ret)
1671 goto out;
1672
1673 len = ceph_decode_32(p);
1674 if (len > 0) {
1675 pr_warn("ceph_request_redirect::object_name is set\n");
1676 goto e_inval;
1677 }
1678
1679 len = ceph_decode_32(p);
1680 *p += len; /* skip osd_instructions */
1681
1682 /* skip the rest */
1683 *p = struct_end;
1684 out:
1685 return ret;
1686
1687 e_inval:
1688 ret = -EINVAL;
1689 goto out;
1690 }
1691
1692 static void complete_request(struct ceph_osd_request *req)
1693 {
1694 complete_all(&req->r_safe_completion); /* fsync waiter */
1695 }
1696
1697 /*
1698 * handle osd op reply. either call the callback if it is specified,
1699 * or do the completion to wake up the waiting thread.
1700 */
1701 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1702 struct ceph_connection *con)
1703 {
1704 void *p, *end;
1705 struct ceph_osd_request *req;
1706 struct ceph_request_redirect redir;
1707 u64 tid;
1708 int object_len;
1709 unsigned int numops;
1710 int payload_len, flags;
1711 s32 result;
1712 s32 retry_attempt;
1713 struct ceph_pg pg;
1714 int err;
1715 u32 reassert_epoch;
1716 u64 reassert_version;
1717 u32 osdmap_epoch;
1718 int already_completed;
1719 u32 bytes;
1720 unsigned int i;
1721
1722 tid = le64_to_cpu(msg->hdr.tid);
1723 dout("handle_reply %p tid %llu\n", msg, tid);
1724
1725 p = msg->front.iov_base;
1726 end = p + msg->front.iov_len;
1727
1728 ceph_decode_need(&p, end, 4, bad);
1729 object_len = ceph_decode_32(&p);
1730 ceph_decode_need(&p, end, object_len, bad);
1731 p += object_len;
1732
1733 err = ceph_decode_pgid(&p, end, &pg);
1734 if (err)
1735 goto bad;
1736
1737 ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1738 flags = ceph_decode_64(&p);
1739 result = ceph_decode_32(&p);
1740 reassert_epoch = ceph_decode_32(&p);
1741 reassert_version = ceph_decode_64(&p);
1742 osdmap_epoch = ceph_decode_32(&p);
1743
1744 /* lookup */
1745 down_read(&osdc->map_sem);
1746 mutex_lock(&osdc->request_mutex);
1747 req = __lookup_request(osdc, tid);
1748 if (req == NULL) {
1749 dout("handle_reply tid %llu dne\n", tid);
1750 goto bad_mutex;
1751 }
1752 ceph_osdc_get_request(req);
1753
1754 dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1755 req, result);
1756
1757 ceph_decode_need(&p, end, 4, bad_put);
1758 numops = ceph_decode_32(&p);
1759 if (numops > CEPH_OSD_MAX_OP)
1760 goto bad_put;
1761 if (numops != req->r_num_ops)
1762 goto bad_put;
1763 payload_len = 0;
1764 ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1765 for (i = 0; i < numops; i++) {
1766 struct ceph_osd_op *op = p;
1767 int len;
1768
1769 len = le32_to_cpu(op->payload_len);
1770 req->r_reply_op_len[i] = len;
1771 dout(" op %d has %d bytes\n", i, len);
1772 payload_len += len;
1773 p += sizeof(*op);
1774 }
1775 bytes = le32_to_cpu(msg->hdr.data_len);
1776 if (payload_len != bytes) {
1777 pr_warning("sum of op payload lens %d != data_len %d",
1778 payload_len, bytes);
1779 goto bad_put;
1780 }
1781
1782 ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1783 retry_attempt = ceph_decode_32(&p);
1784 for (i = 0; i < numops; i++)
1785 req->r_reply_op_result[i] = ceph_decode_32(&p);
1786
1787 if (le16_to_cpu(msg->hdr.version) >= 6) {
1788 p += 8 + 4; /* skip replay_version */
1789 p += 8; /* skip user_version */
1790
1791 err = ceph_redirect_decode(&p, end, &redir);
1792 if (err)
1793 goto bad_put;
1794 } else {
1795 redir.oloc.pool = -1;
1796 }
1797
1798 if (redir.oloc.pool != -1) {
1799 dout("redirect pool %lld\n", redir.oloc.pool);
1800
1801 __unregister_request(osdc, req);
1802
1803 req->r_target_oloc = redir.oloc; /* struct */
1804
1805 /*
1806 * Start redirect requests with nofail=true. If
1807 * mapping fails, request will end up on the notarget
1808 * list, waiting for the new osdmap (which can take
1809 * a while), even though the original request mapped
1810 * successfully. In the future we might want to follow
1811 * original request's nofail setting here.
1812 */
1813 err = __ceph_osdc_start_request(osdc, req, true);
1814 BUG_ON(err);
1815
1816 goto out_unlock;
1817 }
1818
1819 already_completed = req->r_got_reply;
1820 if (!req->r_got_reply) {
1821 req->r_result = result;
1822 dout("handle_reply result %d bytes %d\n", req->r_result,
1823 bytes);
1824 if (req->r_result == 0)
1825 req->r_result = bytes;
1826
1827 /* in case this is a write and we need to replay, */
1828 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1829 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1830
1831 req->r_got_reply = 1;
1832 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1833 dout("handle_reply tid %llu dup ack\n", tid);
1834 goto out_unlock;
1835 }
1836
1837 dout("handle_reply tid %llu flags %d\n", tid, flags);
1838
1839 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1840 __register_linger_request(osdc, req);
1841
1842 /* either this is a read, or we got the safe response */
1843 if (result < 0 ||
1844 (flags & CEPH_OSD_FLAG_ONDISK) ||
1845 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1846 __unregister_request(osdc, req);
1847
1848 mutex_unlock(&osdc->request_mutex);
1849 up_read(&osdc->map_sem);
1850
1851 if (!already_completed) {
1852 if (req->r_unsafe_callback &&
1853 result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1854 req->r_unsafe_callback(req, true);
1855 if (req->r_callback)
1856 req->r_callback(req, msg);
1857 else
1858 complete_all(&req->r_completion);
1859 }
1860
1861 if (flags & CEPH_OSD_FLAG_ONDISK) {
1862 if (req->r_unsafe_callback && already_completed)
1863 req->r_unsafe_callback(req, false);
1864 complete_request(req);
1865 }
1866
1867 out:
1868 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1869 ceph_osdc_put_request(req);
1870 return;
1871 out_unlock:
1872 mutex_unlock(&osdc->request_mutex);
1873 up_read(&osdc->map_sem);
1874 goto out;
1875
1876 bad_put:
1877 req->r_result = -EIO;
1878 __unregister_request(osdc, req);
1879 if (req->r_callback)
1880 req->r_callback(req, msg);
1881 else
1882 complete_all(&req->r_completion);
1883 complete_request(req);
1884 ceph_osdc_put_request(req);
1885 bad_mutex:
1886 mutex_unlock(&osdc->request_mutex);
1887 up_read(&osdc->map_sem);
1888 bad:
1889 pr_err("corrupt osd_op_reply got %d %d\n",
1890 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1891 ceph_msg_dump(msg);
1892 }
1893
1894 static void reset_changed_osds(struct ceph_osd_client *osdc)
1895 {
1896 struct rb_node *p, *n;
1897
1898 for (p = rb_first(&osdc->osds); p; p = n) {
1899 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1900
1901 n = rb_next(p);
1902 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1903 memcmp(&osd->o_con.peer_addr,
1904 ceph_osd_addr(osdc->osdmap,
1905 osd->o_osd),
1906 sizeof(struct ceph_entity_addr)) != 0)
1907 __reset_osd(osdc, osd);
1908 }
1909 }
1910
1911 /*
1912 * Requeue requests whose mapping to an OSD has changed. If requests map to
1913 * no osd, request a new map.
1914 *
1915 * Caller should hold map_sem for read.
1916 */
1917 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1918 bool force_resend_writes)
1919 {
1920 struct ceph_osd_request *req, *nreq;
1921 struct rb_node *p;
1922 int needmap = 0;
1923 int err;
1924 bool force_resend_req;
1925
1926 dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1927 force_resend_writes ? " (force resend writes)" : "");
1928 mutex_lock(&osdc->request_mutex);
1929 for (p = rb_first(&osdc->requests); p; ) {
1930 req = rb_entry(p, struct ceph_osd_request, r_node);
1931 p = rb_next(p);
1932
1933 /*
1934 * For linger requests that have not yet been
1935 * registered, move them to the linger list; they'll
1936 * be sent to the osd in the loop below. Unregister
1937 * the request before re-registering it as a linger
1938 * request to ensure the __map_request() below
1939 * will decide it needs to be sent.
1940 */
1941 if (req->r_linger && list_empty(&req->r_linger_item)) {
1942 dout("%p tid %llu restart on osd%d\n",
1943 req, req->r_tid,
1944 req->r_osd ? req->r_osd->o_osd : -1);
1945 ceph_osdc_get_request(req);
1946 __unregister_request(osdc, req);
1947 __register_linger_request(osdc, req);
1948 ceph_osdc_put_request(req);
1949 continue;
1950 }
1951
1952 force_resend_req = force_resend ||
1953 (force_resend_writes &&
1954 req->r_flags & CEPH_OSD_FLAG_WRITE);
1955 err = __map_request(osdc, req, force_resend_req);
1956 if (err < 0)
1957 continue; /* error */
1958 if (req->r_osd == NULL) {
1959 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1960 needmap++; /* request a newer map */
1961 } else if (err > 0) {
1962 if (!req->r_linger) {
1963 dout("%p tid %llu requeued on osd%d\n", req,
1964 req->r_tid,
1965 req->r_osd ? req->r_osd->o_osd : -1);
1966 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1967 }
1968 }
1969 }
1970
1971 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1972 r_linger_item) {
1973 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1974
1975 err = __map_request(osdc, req,
1976 force_resend || force_resend_writes);
1977 dout("__map_request returned %d\n", err);
1978 if (err == 0)
1979 continue; /* no change and no osd was specified */
1980 if (err < 0)
1981 continue; /* hrm! */
1982 if (req->r_osd == NULL) {
1983 dout("tid %llu maps to no valid osd\n", req->r_tid);
1984 needmap++; /* request a newer map */
1985 continue;
1986 }
1987
1988 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1989 req->r_osd ? req->r_osd->o_osd : -1);
1990 __register_request(osdc, req);
1991 __unregister_linger_request(osdc, req);
1992 }
1993 reset_changed_osds(osdc);
1994 mutex_unlock(&osdc->request_mutex);
1995
1996 if (needmap) {
1997 dout("%d requests for down osds, need new map\n", needmap);
1998 ceph_monc_request_next_osdmap(&osdc->client->monc);
1999 }
2000 }
2001
2002
2003 /*
2004 * Process updated osd map.
2005 *
2006 * The message contains any number of incremental and full maps, normally
2007 * indicating some sort of topology change in the cluster. Kick requests
2008 * off to different OSDs as needed.
2009 */
2010 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2011 {
2012 void *p, *end, *next;
2013 u32 nr_maps, maplen;
2014 u32 epoch;
2015 struct ceph_osdmap *newmap = NULL, *oldmap;
2016 int err;
2017 struct ceph_fsid fsid;
2018 bool was_full;
2019
2020 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2021 p = msg->front.iov_base;
2022 end = p + msg->front.iov_len;
2023
2024 /* verify fsid */
2025 ceph_decode_need(&p, end, sizeof(fsid), bad);
2026 ceph_decode_copy(&p, &fsid, sizeof(fsid));
2027 if (ceph_check_fsid(osdc->client, &fsid) < 0)
2028 return;
2029
2030 down_write(&osdc->map_sem);
2031
2032 was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2033
2034 /* incremental maps */
2035 ceph_decode_32_safe(&p, end, nr_maps, bad);
2036 dout(" %d inc maps\n", nr_maps);
2037 while (nr_maps > 0) {
2038 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2039 epoch = ceph_decode_32(&p);
2040 maplen = ceph_decode_32(&p);
2041 ceph_decode_need(&p, end, maplen, bad);
2042 next = p + maplen;
2043 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2044 dout("applying incremental map %u len %d\n",
2045 epoch, maplen);
2046 newmap = osdmap_apply_incremental(&p, next,
2047 osdc->osdmap,
2048 &osdc->client->msgr);
2049 if (IS_ERR(newmap)) {
2050 err = PTR_ERR(newmap);
2051 goto bad;
2052 }
2053 BUG_ON(!newmap);
2054 if (newmap != osdc->osdmap) {
2055 ceph_osdmap_destroy(osdc->osdmap);
2056 osdc->osdmap = newmap;
2057 }
2058 was_full = was_full ||
2059 ceph_osdmap_flag(osdc->osdmap,
2060 CEPH_OSDMAP_FULL);
2061 kick_requests(osdc, 0, was_full);
2062 } else {
2063 dout("ignoring incremental map %u len %d\n",
2064 epoch, maplen);
2065 }
2066 p = next;
2067 nr_maps--;
2068 }
2069 if (newmap)
2070 goto done;
2071
2072 /* full maps */
2073 ceph_decode_32_safe(&p, end, nr_maps, bad);
2074 dout(" %d full maps\n", nr_maps);
2075 while (nr_maps) {
2076 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2077 epoch = ceph_decode_32(&p);
2078 maplen = ceph_decode_32(&p);
2079 ceph_decode_need(&p, end, maplen, bad);
2080 if (nr_maps > 1) {
2081 dout("skipping non-latest full map %u len %d\n",
2082 epoch, maplen);
2083 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2084 dout("skipping full map %u len %d, "
2085 "older than our %u\n", epoch, maplen,
2086 osdc->osdmap->epoch);
2087 } else {
2088 int skipped_map = 0;
2089
2090 dout("taking full map %u len %d\n", epoch, maplen);
2091 newmap = ceph_osdmap_decode(&p, p+maplen);
2092 if (IS_ERR(newmap)) {
2093 err = PTR_ERR(newmap);
2094 goto bad;
2095 }
2096 BUG_ON(!newmap);
2097 oldmap = osdc->osdmap;
2098 osdc->osdmap = newmap;
2099 if (oldmap) {
2100 if (oldmap->epoch + 1 < newmap->epoch)
2101 skipped_map = 1;
2102 ceph_osdmap_destroy(oldmap);
2103 }
2104 was_full = was_full ||
2105 ceph_osdmap_flag(osdc->osdmap,
2106 CEPH_OSDMAP_FULL);
2107 kick_requests(osdc, skipped_map, was_full);
2108 }
2109 p += maplen;
2110 nr_maps--;
2111 }
2112
2113 if (!osdc->osdmap)
2114 goto bad;
2115 done:
2116 downgrade_write(&osdc->map_sem);
2117 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2118
2119 /*
2120 * subscribe to subsequent osdmap updates if full to ensure
2121 * we find out when we are no longer full and stop returning
2122 * ENOSPC.
2123 */
2124 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2125 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2126 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2127 ceph_monc_request_next_osdmap(&osdc->client->monc);
2128
2129 mutex_lock(&osdc->request_mutex);
2130 __send_queued(osdc);
2131 mutex_unlock(&osdc->request_mutex);
2132 up_read(&osdc->map_sem);
2133 wake_up_all(&osdc->client->auth_wq);
2134 return;
2135
2136 bad:
2137 pr_err("osdc handle_map corrupt msg\n");
2138 ceph_msg_dump(msg);
2139 up_write(&osdc->map_sem);
2140 }
2141
2142 /*
2143 * watch/notify callback event infrastructure
2144 *
2145 * These callbacks are used both for watch and notify operations.
2146 */
2147 static void __release_event(struct kref *kref)
2148 {
2149 struct ceph_osd_event *event =
2150 container_of(kref, struct ceph_osd_event, kref);
2151
2152 dout("__release_event %p\n", event);
2153 kfree(event);
2154 }
2155
2156 static void get_event(struct ceph_osd_event *event)
2157 {
2158 kref_get(&event->kref);
2159 }
2160
2161 void ceph_osdc_put_event(struct ceph_osd_event *event)
2162 {
2163 kref_put(&event->kref, __release_event);
2164 }
2165 EXPORT_SYMBOL(ceph_osdc_put_event);
2166
2167 static void __insert_event(struct ceph_osd_client *osdc,
2168 struct ceph_osd_event *new)
2169 {
2170 struct rb_node **p = &osdc->event_tree.rb_node;
2171 struct rb_node *parent = NULL;
2172 struct ceph_osd_event *event = NULL;
2173
2174 while (*p) {
2175 parent = *p;
2176 event = rb_entry(parent, struct ceph_osd_event, node);
2177 if (new->cookie < event->cookie)
2178 p = &(*p)->rb_left;
2179 else if (new->cookie > event->cookie)
2180 p = &(*p)->rb_right;
2181 else
2182 BUG();
2183 }
2184
2185 rb_link_node(&new->node, parent, p);
2186 rb_insert_color(&new->node, &osdc->event_tree);
2187 }
2188
2189 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2190 u64 cookie)
2191 {
2192 struct rb_node **p = &osdc->event_tree.rb_node;
2193 struct rb_node *parent = NULL;
2194 struct ceph_osd_event *event = NULL;
2195
2196 while (*p) {
2197 parent = *p;
2198 event = rb_entry(parent, struct ceph_osd_event, node);
2199 if (cookie < event->cookie)
2200 p = &(*p)->rb_left;
2201 else if (cookie > event->cookie)
2202 p = &(*p)->rb_right;
2203 else
2204 return event;
2205 }
2206 return NULL;
2207 }
2208
2209 static void __remove_event(struct ceph_osd_event *event)
2210 {
2211 struct ceph_osd_client *osdc = event->osdc;
2212
2213 if (!RB_EMPTY_NODE(&event->node)) {
2214 dout("__remove_event removed %p\n", event);
2215 rb_erase(&event->node, &osdc->event_tree);
2216 ceph_osdc_put_event(event);
2217 } else {
2218 dout("__remove_event didn't remove %p\n", event);
2219 }
2220 }
2221
2222 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2223 void (*event_cb)(u64, u64, u8, void *),
2224 void *data, struct ceph_osd_event **pevent)
2225 {
2226 struct ceph_osd_event *event;
2227
2228 event = kmalloc(sizeof(*event), GFP_NOIO);
2229 if (!event)
2230 return -ENOMEM;
2231
2232 dout("create_event %p\n", event);
2233 event->cb = event_cb;
2234 event->one_shot = 0;
2235 event->data = data;
2236 event->osdc = osdc;
2237 INIT_LIST_HEAD(&event->osd_node);
2238 RB_CLEAR_NODE(&event->node);
2239 kref_init(&event->kref); /* one ref for us */
2240 kref_get(&event->kref); /* one ref for the caller */
2241
2242 spin_lock(&osdc->event_lock);
2243 event->cookie = ++osdc->event_count;
2244 __insert_event(osdc, event);
2245 spin_unlock(&osdc->event_lock);
2246
2247 *pevent = event;
2248 return 0;
2249 }
2250 EXPORT_SYMBOL(ceph_osdc_create_event);
2251
2252 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2253 {
2254 struct ceph_osd_client *osdc = event->osdc;
2255
2256 dout("cancel_event %p\n", event);
2257 spin_lock(&osdc->event_lock);
2258 __remove_event(event);
2259 spin_unlock(&osdc->event_lock);
2260 ceph_osdc_put_event(event); /* caller's */
2261 }
2262 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2263
2264
2265 static void do_event_work(struct work_struct *work)
2266 {
2267 struct ceph_osd_event_work *event_work =
2268 container_of(work, struct ceph_osd_event_work, work);
2269 struct ceph_osd_event *event = event_work->event;
2270 u64 ver = event_work->ver;
2271 u64 notify_id = event_work->notify_id;
2272 u8 opcode = event_work->opcode;
2273
2274 dout("do_event_work completing %p\n", event);
2275 event->cb(ver, notify_id, opcode, event->data);
2276 dout("do_event_work completed %p\n", event);
2277 ceph_osdc_put_event(event);
2278 kfree(event_work);
2279 }
2280
2281
2282 /*
2283 * Process osd watch notifications
2284 */
2285 static void handle_watch_notify(struct ceph_osd_client *osdc,
2286 struct ceph_msg *msg)
2287 {
2288 void *p, *end;
2289 u8 proto_ver;
2290 u64 cookie, ver, notify_id;
2291 u8 opcode;
2292 struct ceph_osd_event *event;
2293 struct ceph_osd_event_work *event_work;
2294
2295 p = msg->front.iov_base;
2296 end = p + msg->front.iov_len;
2297
2298 ceph_decode_8_safe(&p, end, proto_ver, bad);
2299 ceph_decode_8_safe(&p, end, opcode, bad);
2300 ceph_decode_64_safe(&p, end, cookie, bad);
2301 ceph_decode_64_safe(&p, end, ver, bad);
2302 ceph_decode_64_safe(&p, end, notify_id, bad);
2303
2304 spin_lock(&osdc->event_lock);
2305 event = __find_event(osdc, cookie);
2306 if (event) {
2307 BUG_ON(event->one_shot);
2308 get_event(event);
2309 }
2310 spin_unlock(&osdc->event_lock);
2311 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2312 cookie, ver, event);
2313 if (event) {
2314 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2315 if (!event_work) {
2316 dout("ERROR: could not allocate event_work\n");
2317 goto done_err;
2318 }
2319 INIT_WORK(&event_work->work, do_event_work);
2320 event_work->event = event;
2321 event_work->ver = ver;
2322 event_work->notify_id = notify_id;
2323 event_work->opcode = opcode;
2324 if (!queue_work(osdc->notify_wq, &event_work->work)) {
2325 dout("WARNING: failed to queue notify event work\n");
2326 goto done_err;
2327 }
2328 }
2329
2330 return;
2331
2332 done_err:
2333 ceph_osdc_put_event(event);
2334 return;
2335
2336 bad:
2337 pr_err("osdc handle_watch_notify corrupt msg\n");
2338 }
2339
2340 /*
2341 * build new request AND message
2342 *
2343 */
2344 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2345 struct ceph_snap_context *snapc, u64 snap_id,
2346 struct timespec *mtime)
2347 {
2348 struct ceph_msg *msg = req->r_request;
2349 void *p;
2350 size_t msg_size;
2351 int flags = req->r_flags;
2352 u64 data_len;
2353 unsigned int i;
2354
2355 req->r_snapid = snap_id;
2356 req->r_snapc = ceph_get_snap_context(snapc);
2357
2358 /* encode request */
2359 msg->hdr.version = cpu_to_le16(4);
2360
2361 p = msg->front.iov_base;
2362 ceph_encode_32(&p, 1); /* client_inc is always 1 */
2363 req->r_request_osdmap_epoch = p;
2364 p += 4;
2365 req->r_request_flags = p;
2366 p += 4;
2367 if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2368 ceph_encode_timespec(p, mtime);
2369 p += sizeof(struct ceph_timespec);
2370 req->r_request_reassert_version = p;
2371 p += sizeof(struct ceph_eversion); /* will get filled in */
2372
2373 /* oloc */
2374 ceph_encode_8(&p, 4);
2375 ceph_encode_8(&p, 4);
2376 ceph_encode_32(&p, 8 + 4 + 4);
2377 req->r_request_pool = p;
2378 p += 8;
2379 ceph_encode_32(&p, -1); /* preferred */
2380 ceph_encode_32(&p, 0); /* key len */
2381
2382 ceph_encode_8(&p, 1);
2383 req->r_request_pgid = p;
2384 p += 8 + 4;
2385 ceph_encode_32(&p, -1); /* preferred */
2386
2387 /* oid */
2388 ceph_encode_32(&p, req->r_base_oid.name_len);
2389 memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2390 dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2391 req->r_base_oid.name, req->r_base_oid.name_len);
2392 p += req->r_base_oid.name_len;
2393
2394 /* ops--can imply data */
2395 ceph_encode_16(&p, (u16)req->r_num_ops);
2396 data_len = 0;
2397 for (i = 0; i < req->r_num_ops; i++) {
2398 data_len += osd_req_encode_op(req, p, i);
2399 p += sizeof(struct ceph_osd_op);
2400 }
2401
2402 /* snaps */
2403 ceph_encode_64(&p, req->r_snapid);
2404 ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2405 ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2406 if (req->r_snapc) {
2407 for (i = 0; i < snapc->num_snaps; i++) {
2408 ceph_encode_64(&p, req->r_snapc->snaps[i]);
2409 }
2410 }
2411
2412 req->r_request_attempts = p;
2413 p += 4;
2414
2415 /* data */
2416 if (flags & CEPH_OSD_FLAG_WRITE) {
2417 u16 data_off;
2418
2419 /*
2420 * The header "data_off" is a hint to the receiver
2421 * allowing it to align received data into its
2422 * buffers such that there's no need to re-copy
2423 * it before writing it to disk (direct I/O).
2424 */
2425 data_off = (u16) (off & 0xffff);
2426 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2427 }
2428 req->r_request->hdr.data_len = cpu_to_le32(data_len);
2429
2430 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2431 msg_size = p - msg->front.iov_base;
2432 msg->front.iov_len = msg_size;
2433 msg->hdr.front_len = cpu_to_le32(msg_size);
2434
2435 dout("build_request msg_size was %d\n", (int)msg_size);
2436 }
2437 EXPORT_SYMBOL(ceph_osdc_build_request);
2438
2439 /*
2440 * Register request, send initial attempt.
2441 */
2442 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2443 struct ceph_osd_request *req,
2444 bool nofail)
2445 {
2446 int rc;
2447
2448 down_read(&osdc->map_sem);
2449 mutex_lock(&osdc->request_mutex);
2450
2451 rc = __ceph_osdc_start_request(osdc, req, nofail);
2452
2453 mutex_unlock(&osdc->request_mutex);
2454 up_read(&osdc->map_sem);
2455
2456 return rc;
2457 }
2458 EXPORT_SYMBOL(ceph_osdc_start_request);
2459
2460 /*
2461 * Unregister a registered request. The request is not completed (i.e.
2462 * no callbacks or wakeups) - higher layers are supposed to know what
2463 * they are canceling.
2464 */
2465 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2466 {
2467 struct ceph_osd_client *osdc = req->r_osdc;
2468
2469 mutex_lock(&osdc->request_mutex);
2470 if (req->r_linger)
2471 __unregister_linger_request(osdc, req);
2472 __unregister_request(osdc, req);
2473 mutex_unlock(&osdc->request_mutex);
2474
2475 dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2476 }
2477 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2478
2479 /*
2480 * wait for a request to complete
2481 */
2482 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2483 struct ceph_osd_request *req)
2484 {
2485 int rc;
2486
2487 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2488
2489 rc = wait_for_completion_interruptible(&req->r_completion);
2490 if (rc < 0) {
2491 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2492 ceph_osdc_cancel_request(req);
2493 complete_request(req);
2494 return rc;
2495 }
2496
2497 dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2498 req->r_result);
2499 return req->r_result;
2500 }
2501 EXPORT_SYMBOL(ceph_osdc_wait_request);
2502
2503 /*
2504 * sync - wait for all in-flight requests to flush. avoid starvation.
2505 */
2506 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2507 {
2508 struct ceph_osd_request *req;
2509 u64 last_tid, next_tid = 0;
2510
2511 mutex_lock(&osdc->request_mutex);
2512 last_tid = osdc->last_tid;
2513 while (1) {
2514 req = __lookup_request_ge(osdc, next_tid);
2515 if (!req)
2516 break;
2517 if (req->r_tid > last_tid)
2518 break;
2519
2520 next_tid = req->r_tid + 1;
2521 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2522 continue;
2523
2524 ceph_osdc_get_request(req);
2525 mutex_unlock(&osdc->request_mutex);
2526 dout("sync waiting on tid %llu (last is %llu)\n",
2527 req->r_tid, last_tid);
2528 wait_for_completion(&req->r_safe_completion);
2529 mutex_lock(&osdc->request_mutex);
2530 ceph_osdc_put_request(req);
2531 }
2532 mutex_unlock(&osdc->request_mutex);
2533 dout("sync done (thru tid %llu)\n", last_tid);
2534 }
2535 EXPORT_SYMBOL(ceph_osdc_sync);
2536
2537 /*
2538 * Call all pending notify callbacks - for use after a watch is
2539 * unregistered, to make sure no more callbacks for it will be invoked
2540 */
2541 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2542 {
2543 flush_workqueue(osdc->notify_wq);
2544 }
2545 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2546
2547
2548 /*
2549 * init, shutdown
2550 */
2551 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2552 {
2553 int err;
2554
2555 dout("init\n");
2556 osdc->client = client;
2557 osdc->osdmap = NULL;
2558 init_rwsem(&osdc->map_sem);
2559 init_completion(&osdc->map_waiters);
2560 osdc->last_requested_map = 0;
2561 mutex_init(&osdc->request_mutex);
2562 osdc->last_tid = 0;
2563 osdc->osds = RB_ROOT;
2564 INIT_LIST_HEAD(&osdc->osd_lru);
2565 osdc->requests = RB_ROOT;
2566 INIT_LIST_HEAD(&osdc->req_lru);
2567 INIT_LIST_HEAD(&osdc->req_unsent);
2568 INIT_LIST_HEAD(&osdc->req_notarget);
2569 INIT_LIST_HEAD(&osdc->req_linger);
2570 osdc->num_requests = 0;
2571 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2572 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2573 spin_lock_init(&osdc->event_lock);
2574 osdc->event_tree = RB_ROOT;
2575 osdc->event_count = 0;
2576
2577 schedule_delayed_work(&osdc->osds_timeout_work,
2578 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2579
2580 err = -ENOMEM;
2581 osdc->req_mempool = mempool_create_kmalloc_pool(10,
2582 sizeof(struct ceph_osd_request));
2583 if (!osdc->req_mempool)
2584 goto out;
2585
2586 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2587 OSD_OP_FRONT_LEN, 10, true,
2588 "osd_op");
2589 if (err < 0)
2590 goto out_mempool;
2591 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2592 OSD_OPREPLY_FRONT_LEN, 10, true,
2593 "osd_op_reply");
2594 if (err < 0)
2595 goto out_msgpool;
2596
2597 err = -ENOMEM;
2598 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2599 if (!osdc->notify_wq)
2600 goto out_msgpool_reply;
2601
2602 return 0;
2603
2604 out_msgpool_reply:
2605 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2606 out_msgpool:
2607 ceph_msgpool_destroy(&osdc->msgpool_op);
2608 out_mempool:
2609 mempool_destroy(osdc->req_mempool);
2610 out:
2611 return err;
2612 }
2613
2614 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2615 {
2616 flush_workqueue(osdc->notify_wq);
2617 destroy_workqueue(osdc->notify_wq);
2618 cancel_delayed_work_sync(&osdc->timeout_work);
2619 cancel_delayed_work_sync(&osdc->osds_timeout_work);
2620 if (osdc->osdmap) {
2621 ceph_osdmap_destroy(osdc->osdmap);
2622 osdc->osdmap = NULL;
2623 }
2624 remove_all_osds(osdc);
2625 mempool_destroy(osdc->req_mempool);
2626 ceph_msgpool_destroy(&osdc->msgpool_op);
2627 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2628 }
2629
2630 /*
2631 * Read some contiguous pages. If we cross a stripe boundary, shorten
2632 * *plen. Return number of bytes read, or error.
2633 */
2634 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2635 struct ceph_vino vino, struct ceph_file_layout *layout,
2636 u64 off, u64 *plen,
2637 u32 truncate_seq, u64 truncate_size,
2638 struct page **pages, int num_pages, int page_align)
2639 {
2640 struct ceph_osd_request *req;
2641 int rc = 0;
2642
2643 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2644 vino.snap, off, *plen);
2645 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2646 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2647 NULL, truncate_seq, truncate_size,
2648 false);
2649 if (IS_ERR(req))
2650 return PTR_ERR(req);
2651
2652 /* it may be a short read due to an object boundary */
2653
2654 osd_req_op_extent_osd_data_pages(req, 0,
2655 pages, *plen, page_align, false, false);
2656
2657 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
2658 off, *plen, *plen, page_align);
2659
2660 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2661
2662 rc = ceph_osdc_start_request(osdc, req, false);
2663 if (!rc)
2664 rc = ceph_osdc_wait_request(osdc, req);
2665
2666 ceph_osdc_put_request(req);
2667 dout("readpages result %d\n", rc);
2668 return rc;
2669 }
2670 EXPORT_SYMBOL(ceph_osdc_readpages);
2671
2672 /*
2673 * do a synchronous write on N pages
2674 */
2675 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2676 struct ceph_file_layout *layout,
2677 struct ceph_snap_context *snapc,
2678 u64 off, u64 len,
2679 u32 truncate_seq, u64 truncate_size,
2680 struct timespec *mtime,
2681 struct page **pages, int num_pages)
2682 {
2683 struct ceph_osd_request *req;
2684 int rc = 0;
2685 int page_align = off & ~PAGE_MASK;
2686
2687 BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */
2688 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2689 CEPH_OSD_OP_WRITE,
2690 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2691 snapc, truncate_seq, truncate_size,
2692 true);
2693 if (IS_ERR(req))
2694 return PTR_ERR(req);
2695
2696 /* it may be a short write due to an object boundary */
2697 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2698 false, false);
2699 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2700
2701 ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2702
2703 rc = ceph_osdc_start_request(osdc, req, true);
2704 if (!rc)
2705 rc = ceph_osdc_wait_request(osdc, req);
2706
2707 ceph_osdc_put_request(req);
2708 if (rc == 0)
2709 rc = len;
2710 dout("writepages result %d\n", rc);
2711 return rc;
2712 }
2713 EXPORT_SYMBOL(ceph_osdc_writepages);
2714
2715 int ceph_osdc_setup(void)
2716 {
2717 BUG_ON(ceph_osd_request_cache);
2718 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2719 sizeof (struct ceph_osd_request),
2720 __alignof__(struct ceph_osd_request),
2721 0, NULL);
2722
2723 return ceph_osd_request_cache ? 0 : -ENOMEM;
2724 }
2725 EXPORT_SYMBOL(ceph_osdc_setup);
2726
2727 void ceph_osdc_cleanup(void)
2728 {
2729 BUG_ON(!ceph_osd_request_cache);
2730 kmem_cache_destroy(ceph_osd_request_cache);
2731 ceph_osd_request_cache = NULL;
2732 }
2733 EXPORT_SYMBOL(ceph_osdc_cleanup);
2734
2735 /*
2736 * handle incoming message
2737 */
2738 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2739 {
2740 struct ceph_osd *osd = con->private;
2741 struct ceph_osd_client *osdc;
2742 int type = le16_to_cpu(msg->hdr.type);
2743
2744 if (!osd)
2745 goto out;
2746 osdc = osd->o_osdc;
2747
2748 switch (type) {
2749 case CEPH_MSG_OSD_MAP:
2750 ceph_osdc_handle_map(osdc, msg);
2751 break;
2752 case CEPH_MSG_OSD_OPREPLY:
2753 handle_reply(osdc, msg, con);
2754 break;
2755 case CEPH_MSG_WATCH_NOTIFY:
2756 handle_watch_notify(osdc, msg);
2757 break;
2758
2759 default:
2760 pr_err("received unknown message type %d %s\n", type,
2761 ceph_msg_type_name(type));
2762 }
2763 out:
2764 ceph_msg_put(msg);
2765 }
2766
2767 /*
2768 * lookup and return message for incoming reply. set up reply message
2769 * pages.
2770 */
2771 static struct ceph_msg *get_reply(struct ceph_connection *con,
2772 struct ceph_msg_header *hdr,
2773 int *skip)
2774 {
2775 struct ceph_osd *osd = con->private;
2776 struct ceph_osd_client *osdc = osd->o_osdc;
2777 struct ceph_msg *m;
2778 struct ceph_osd_request *req;
2779 int front_len = le32_to_cpu(hdr->front_len);
2780 int data_len = le32_to_cpu(hdr->data_len);
2781 u64 tid;
2782
2783 tid = le64_to_cpu(hdr->tid);
2784 mutex_lock(&osdc->request_mutex);
2785 req = __lookup_request(osdc, tid);
2786 if (!req) {
2787 *skip = 1;
2788 m = NULL;
2789 dout("get_reply unknown tid %llu from osd%d\n", tid,
2790 osd->o_osd);
2791 goto out;
2792 }
2793
2794 if (req->r_reply->con)
2795 dout("%s revoking msg %p from old con %p\n", __func__,
2796 req->r_reply, req->r_reply->con);
2797 ceph_msg_revoke_incoming(req->r_reply);
2798
2799 if (front_len > req->r_reply->front_alloc_len) {
2800 pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n",
2801 front_len, req->r_reply->front_alloc_len,
2802 (unsigned int)con->peer_name.type,
2803 le64_to_cpu(con->peer_name.num));
2804 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2805 false);
2806 if (!m)
2807 goto out;
2808 ceph_msg_put(req->r_reply);
2809 req->r_reply = m;
2810 }
2811 m = ceph_msg_get(req->r_reply);
2812
2813 if (data_len > 0) {
2814 struct ceph_osd_data *osd_data;
2815
2816 /*
2817 * XXX This is assuming there is only one op containing
2818 * XXX page data. Probably OK for reads, but this
2819 * XXX ought to be done more generally.
2820 */
2821 osd_data = osd_req_op_extent_osd_data(req, 0);
2822 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2823 if (osd_data->pages &&
2824 unlikely(osd_data->length < data_len)) {
2825
2826 pr_warning("tid %lld reply has %d bytes "
2827 "we had only %llu bytes ready\n",
2828 tid, data_len, osd_data->length);
2829 *skip = 1;
2830 ceph_msg_put(m);
2831 m = NULL;
2832 goto out;
2833 }
2834 }
2835 }
2836 *skip = 0;
2837 dout("get_reply tid %lld %p\n", tid, m);
2838
2839 out:
2840 mutex_unlock(&osdc->request_mutex);
2841 return m;
2842
2843 }
2844
2845 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2846 struct ceph_msg_header *hdr,
2847 int *skip)
2848 {
2849 struct ceph_osd *osd = con->private;
2850 int type = le16_to_cpu(hdr->type);
2851 int front = le32_to_cpu(hdr->front_len);
2852
2853 *skip = 0;
2854 switch (type) {
2855 case CEPH_MSG_OSD_MAP:
2856 case CEPH_MSG_WATCH_NOTIFY:
2857 return ceph_msg_new(type, front, GFP_NOFS, false);
2858 case CEPH_MSG_OSD_OPREPLY:
2859 return get_reply(con, hdr, skip);
2860 default:
2861 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2862 osd->o_osd);
2863 *skip = 1;
2864 return NULL;
2865 }
2866 }
2867
2868 /*
2869 * Wrappers to refcount containing ceph_osd struct
2870 */
2871 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2872 {
2873 struct ceph_osd *osd = con->private;
2874 if (get_osd(osd))
2875 return con;
2876 return NULL;
2877 }
2878
2879 static void put_osd_con(struct ceph_connection *con)
2880 {
2881 struct ceph_osd *osd = con->private;
2882 put_osd(osd);
2883 }
2884
2885 /*
2886 * authentication
2887 */
2888 /*
2889 * Note: returned pointer is the address of a structure that's
2890 * managed separately. Caller must *not* attempt to free it.
2891 */
2892 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2893 int *proto, int force_new)
2894 {
2895 struct ceph_osd *o = con->private;
2896 struct ceph_osd_client *osdc = o->o_osdc;
2897 struct ceph_auth_client *ac = osdc->client->monc.auth;
2898 struct ceph_auth_handshake *auth = &o->o_auth;
2899
2900 if (force_new && auth->authorizer) {
2901 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2902 auth->authorizer = NULL;
2903 }
2904 if (!auth->authorizer) {
2905 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2906 auth);
2907 if (ret)
2908 return ERR_PTR(ret);
2909 } else {
2910 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2911 auth);
2912 if (ret)
2913 return ERR_PTR(ret);
2914 }
2915 *proto = ac->protocol;
2916
2917 return auth;
2918 }
2919
2920
2921 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2922 {
2923 struct ceph_osd *o = con->private;
2924 struct ceph_osd_client *osdc = o->o_osdc;
2925 struct ceph_auth_client *ac = osdc->client->monc.auth;
2926
2927 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2928 }
2929
2930 static int invalidate_authorizer(struct ceph_connection *con)
2931 {
2932 struct ceph_osd *o = con->private;
2933 struct ceph_osd_client *osdc = o->o_osdc;
2934 struct ceph_auth_client *ac = osdc->client->monc.auth;
2935
2936 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2937 return ceph_monc_validate_auth(&osdc->client->monc);
2938 }
2939
2940 static const struct ceph_connection_operations osd_con_ops = {
2941 .get = get_osd_con,
2942 .put = put_osd_con,
2943 .dispatch = dispatch,
2944 .get_authorizer = get_authorizer,
2945 .verify_authorizer_reply = verify_authorizer_reply,
2946 .invalidate_authorizer = invalidate_authorizer,
2947 .alloc_msg = alloc_msg,
2948 .fault = osd_reset,
2949 };
Linux kernel - Deliverables
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