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libceph: switch to calc_target(), part 1
[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_OPREPLY_FRONT_LEN 512
23
24 static struct kmem_cache *ceph_osd_request_cache;
25
26 static const struct ceph_connection_operations osd_con_ops;
27
28 static void __send_queued(struct ceph_osd_client *osdc);
29 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
30 static void __register_request(struct ceph_osd_client *osdc,
31 struct ceph_osd_request *req);
32 static void __unregister_request(struct ceph_osd_client *osdc,
33 struct ceph_osd_request *req);
34 static void __unregister_linger_request(struct ceph_osd_client *osdc,
35 struct ceph_osd_request *req);
36 static void __enqueue_request(struct ceph_osd_request *req);
37 static void __send_request(struct ceph_osd_client *osdc,
38 struct ceph_osd_request *req);
39
40 /*
41 * Implement client access to distributed object storage cluster.
42 *
43 * All data objects are stored within a cluster/cloud of OSDs, or
44 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
45 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
46 * remote daemons serving up and coordinating consistent and safe
47 * access to storage.
48 *
49 * Cluster membership and the mapping of data objects onto storage devices
50 * are described by the osd map.
51 *
52 * We keep track of pending OSD requests (read, write), resubmit
53 * requests to different OSDs when the cluster topology/data layout
54 * change, or retry the affected requests when the communications
55 * channel with an OSD is reset.
56 */
57
58 /*
59 * calculate the mapping of a file extent onto an object, and fill out the
60 * request accordingly. shorten extent as necessary if it crosses an
61 * object boundary.
62 *
63 * fill osd op in request message.
64 */
65 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
66 u64 *objnum, u64 *objoff, u64 *objlen)
67 {
68 u64 orig_len = *plen;
69 int r;
70
71 /* object extent? */
72 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
73 objoff, objlen);
74 if (r < 0)
75 return r;
76 if (*objlen < orig_len) {
77 *plen = *objlen;
78 dout(" skipping last %llu, final file extent %llu~%llu\n",
79 orig_len - *plen, off, *plen);
80 }
81
82 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
83
84 return 0;
85 }
86
87 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
88 {
89 memset(osd_data, 0, sizeof (*osd_data));
90 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
91 }
92
93 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
94 struct page **pages, u64 length, u32 alignment,
95 bool pages_from_pool, bool own_pages)
96 {
97 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
98 osd_data->pages = pages;
99 osd_data->length = length;
100 osd_data->alignment = alignment;
101 osd_data->pages_from_pool = pages_from_pool;
102 osd_data->own_pages = own_pages;
103 }
104
105 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
106 struct ceph_pagelist *pagelist)
107 {
108 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
109 osd_data->pagelist = pagelist;
110 }
111
112 #ifdef CONFIG_BLOCK
113 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
114 struct bio *bio, size_t bio_length)
115 {
116 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
117 osd_data->bio = bio;
118 osd_data->bio_length = bio_length;
119 }
120 #endif /* CONFIG_BLOCK */
121
122 #define osd_req_op_data(oreq, whch, typ, fld) \
123 ({ \
124 struct ceph_osd_request *__oreq = (oreq); \
125 unsigned int __whch = (whch); \
126 BUG_ON(__whch >= __oreq->r_num_ops); \
127 &__oreq->r_ops[__whch].typ.fld; \
128 })
129
130 static struct ceph_osd_data *
131 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
132 {
133 BUG_ON(which >= osd_req->r_num_ops);
134
135 return &osd_req->r_ops[which].raw_data_in;
136 }
137
138 struct ceph_osd_data *
139 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
140 unsigned int which)
141 {
142 return osd_req_op_data(osd_req, which, extent, osd_data);
143 }
144 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
145
146 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
147 unsigned int which, struct page **pages,
148 u64 length, u32 alignment,
149 bool pages_from_pool, bool own_pages)
150 {
151 struct ceph_osd_data *osd_data;
152
153 osd_data = osd_req_op_raw_data_in(osd_req, which);
154 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
155 pages_from_pool, own_pages);
156 }
157 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
158
159 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
160 unsigned int which, struct page **pages,
161 u64 length, u32 alignment,
162 bool pages_from_pool, bool own_pages)
163 {
164 struct ceph_osd_data *osd_data;
165
166 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
167 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
168 pages_from_pool, own_pages);
169 }
170 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
171
172 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
173 unsigned int which, struct ceph_pagelist *pagelist)
174 {
175 struct ceph_osd_data *osd_data;
176
177 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
178 ceph_osd_data_pagelist_init(osd_data, pagelist);
179 }
180 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
181
182 #ifdef CONFIG_BLOCK
183 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
184 unsigned int which, struct bio *bio, size_t bio_length)
185 {
186 struct ceph_osd_data *osd_data;
187
188 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
189 ceph_osd_data_bio_init(osd_data, bio, bio_length);
190 }
191 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
192 #endif /* CONFIG_BLOCK */
193
194 static void osd_req_op_cls_request_info_pagelist(
195 struct ceph_osd_request *osd_req,
196 unsigned int which, struct ceph_pagelist *pagelist)
197 {
198 struct ceph_osd_data *osd_data;
199
200 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
201 ceph_osd_data_pagelist_init(osd_data, pagelist);
202 }
203
204 void osd_req_op_cls_request_data_pagelist(
205 struct ceph_osd_request *osd_req,
206 unsigned int which, struct ceph_pagelist *pagelist)
207 {
208 struct ceph_osd_data *osd_data;
209
210 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
211 ceph_osd_data_pagelist_init(osd_data, pagelist);
212 }
213 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
214
215 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
216 unsigned int which, struct page **pages, u64 length,
217 u32 alignment, bool pages_from_pool, bool own_pages)
218 {
219 struct ceph_osd_data *osd_data;
220
221 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
222 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
223 pages_from_pool, own_pages);
224 }
225 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
226
227 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
228 unsigned int which, struct page **pages, u64 length,
229 u32 alignment, bool pages_from_pool, bool own_pages)
230 {
231 struct ceph_osd_data *osd_data;
232
233 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
234 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
235 pages_from_pool, own_pages);
236 }
237 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
238
239 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
240 {
241 switch (osd_data->type) {
242 case CEPH_OSD_DATA_TYPE_NONE:
243 return 0;
244 case CEPH_OSD_DATA_TYPE_PAGES:
245 return osd_data->length;
246 case CEPH_OSD_DATA_TYPE_PAGELIST:
247 return (u64)osd_data->pagelist->length;
248 #ifdef CONFIG_BLOCK
249 case CEPH_OSD_DATA_TYPE_BIO:
250 return (u64)osd_data->bio_length;
251 #endif /* CONFIG_BLOCK */
252 default:
253 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
254 return 0;
255 }
256 }
257
258 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
259 {
260 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
261 int num_pages;
262
263 num_pages = calc_pages_for((u64)osd_data->alignment,
264 (u64)osd_data->length);
265 ceph_release_page_vector(osd_data->pages, num_pages);
266 }
267 ceph_osd_data_init(osd_data);
268 }
269
270 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
271 unsigned int which)
272 {
273 struct ceph_osd_req_op *op;
274
275 BUG_ON(which >= osd_req->r_num_ops);
276 op = &osd_req->r_ops[which];
277
278 switch (op->op) {
279 case CEPH_OSD_OP_READ:
280 case CEPH_OSD_OP_WRITE:
281 case CEPH_OSD_OP_WRITEFULL:
282 ceph_osd_data_release(&op->extent.osd_data);
283 break;
284 case CEPH_OSD_OP_CALL:
285 ceph_osd_data_release(&op->cls.request_info);
286 ceph_osd_data_release(&op->cls.request_data);
287 ceph_osd_data_release(&op->cls.response_data);
288 break;
289 case CEPH_OSD_OP_SETXATTR:
290 case CEPH_OSD_OP_CMPXATTR:
291 ceph_osd_data_release(&op->xattr.osd_data);
292 break;
293 case CEPH_OSD_OP_STAT:
294 ceph_osd_data_release(&op->raw_data_in);
295 break;
296 default:
297 break;
298 }
299 }
300
301 /*
302 * Assumes @t is zero-initialized.
303 */
304 static void target_init(struct ceph_osd_request_target *t)
305 {
306 ceph_oid_init(&t->base_oid);
307 ceph_oloc_init(&t->base_oloc);
308 ceph_oid_init(&t->target_oid);
309 ceph_oloc_init(&t->target_oloc);
310
311 ceph_osds_init(&t->acting);
312 ceph_osds_init(&t->up);
313 t->size = -1;
314 t->min_size = -1;
315
316 t->osd = CEPH_HOMELESS_OSD;
317 }
318
319 static void target_destroy(struct ceph_osd_request_target *t)
320 {
321 ceph_oid_destroy(&t->base_oid);
322 ceph_oid_destroy(&t->target_oid);
323 }
324
325 /*
326 * requests
327 */
328 static void ceph_osdc_release_request(struct kref *kref)
329 {
330 struct ceph_osd_request *req = container_of(kref,
331 struct ceph_osd_request, r_kref);
332 unsigned int which;
333
334 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
335 req->r_request, req->r_reply);
336 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
337 WARN_ON(!list_empty(&req->r_req_lru_item));
338 WARN_ON(!list_empty(&req->r_osd_item));
339 WARN_ON(!list_empty(&req->r_linger_item));
340 WARN_ON(!list_empty(&req->r_linger_osd_item));
341 WARN_ON(req->r_osd);
342
343 if (req->r_request)
344 ceph_msg_put(req->r_request);
345 if (req->r_reply) {
346 ceph_msg_revoke_incoming(req->r_reply);
347 ceph_msg_put(req->r_reply);
348 }
349
350 for (which = 0; which < req->r_num_ops; which++)
351 osd_req_op_data_release(req, which);
352
353 target_destroy(&req->r_t);
354 ceph_put_snap_context(req->r_snapc);
355
356 if (req->r_mempool)
357 mempool_free(req, req->r_osdc->req_mempool);
358 else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
359 kmem_cache_free(ceph_osd_request_cache, req);
360 else
361 kfree(req);
362 }
363
364 void ceph_osdc_get_request(struct ceph_osd_request *req)
365 {
366 dout("%s %p (was %d)\n", __func__, req,
367 atomic_read(&req->r_kref.refcount));
368 kref_get(&req->r_kref);
369 }
370 EXPORT_SYMBOL(ceph_osdc_get_request);
371
372 void ceph_osdc_put_request(struct ceph_osd_request *req)
373 {
374 if (req) {
375 dout("%s %p (was %d)\n", __func__, req,
376 atomic_read(&req->r_kref.refcount));
377 kref_put(&req->r_kref, ceph_osdc_release_request);
378 }
379 }
380 EXPORT_SYMBOL(ceph_osdc_put_request);
381
382 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
383 struct ceph_snap_context *snapc,
384 unsigned int num_ops,
385 bool use_mempool,
386 gfp_t gfp_flags)
387 {
388 struct ceph_osd_request *req;
389
390 if (use_mempool) {
391 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
392 req = mempool_alloc(osdc->req_mempool, gfp_flags);
393 } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
394 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
395 } else {
396 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
397 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
398 gfp_flags);
399 }
400 if (unlikely(!req))
401 return NULL;
402
403 /* req only, each op is zeroed in _osd_req_op_init() */
404 memset(req, 0, sizeof(*req));
405
406 req->r_osdc = osdc;
407 req->r_mempool = use_mempool;
408 req->r_num_ops = num_ops;
409 req->r_snapid = CEPH_NOSNAP;
410 req->r_snapc = ceph_get_snap_context(snapc);
411
412 kref_init(&req->r_kref);
413 init_completion(&req->r_completion);
414 init_completion(&req->r_safe_completion);
415 RB_CLEAR_NODE(&req->r_node);
416 INIT_LIST_HEAD(&req->r_unsafe_item);
417 INIT_LIST_HEAD(&req->r_linger_item);
418 INIT_LIST_HEAD(&req->r_linger_osd_item);
419 INIT_LIST_HEAD(&req->r_req_lru_item);
420 INIT_LIST_HEAD(&req->r_osd_item);
421
422 target_init(&req->r_t);
423
424 dout("%s req %p\n", __func__, req);
425 return req;
426 }
427 EXPORT_SYMBOL(ceph_osdc_alloc_request);
428
429 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
430 {
431 struct ceph_osd_client *osdc = req->r_osdc;
432 struct ceph_msg *msg;
433 int msg_size;
434
435 WARN_ON(ceph_oid_empty(&req->r_base_oid));
436
437 /* create request message */
438 msg_size = 4 + 4 + 4; /* client_inc, osdmap_epoch, flags */
439 msg_size += 4 + 4 + 4 + 8; /* mtime, reassert_version */
440 msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
441 msg_size += 1 + 8 + 4 + 4; /* pgid */
442 msg_size += 4 + req->r_base_oid.name_len; /* oid */
443 msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
444 msg_size += 8; /* snapid */
445 msg_size += 8; /* snap_seq */
446 msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
447 msg_size += 4; /* retry_attempt */
448
449 if (req->r_mempool)
450 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
451 else
452 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
453 if (!msg)
454 return -ENOMEM;
455
456 memset(msg->front.iov_base, 0, msg->front.iov_len);
457 req->r_request = msg;
458
459 /* create reply message */
460 msg_size = OSD_OPREPLY_FRONT_LEN;
461 msg_size += req->r_base_oid.name_len;
462 msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
463
464 if (req->r_mempool)
465 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
466 else
467 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
468 if (!msg)
469 return -ENOMEM;
470
471 req->r_reply = msg;
472
473 return 0;
474 }
475 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
476
477 static bool osd_req_opcode_valid(u16 opcode)
478 {
479 switch (opcode) {
480 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
481 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
482 #undef GENERATE_CASE
483 default:
484 return false;
485 }
486 }
487
488 /*
489 * This is an osd op init function for opcodes that have no data or
490 * other information associated with them. It also serves as a
491 * common init routine for all the other init functions, below.
492 */
493 static struct ceph_osd_req_op *
494 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
495 u16 opcode, u32 flags)
496 {
497 struct ceph_osd_req_op *op;
498
499 BUG_ON(which >= osd_req->r_num_ops);
500 BUG_ON(!osd_req_opcode_valid(opcode));
501
502 op = &osd_req->r_ops[which];
503 memset(op, 0, sizeof (*op));
504 op->op = opcode;
505 op->flags = flags;
506
507 return op;
508 }
509
510 void osd_req_op_init(struct ceph_osd_request *osd_req,
511 unsigned int which, u16 opcode, u32 flags)
512 {
513 (void)_osd_req_op_init(osd_req, which, opcode, flags);
514 }
515 EXPORT_SYMBOL(osd_req_op_init);
516
517 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
518 unsigned int which, u16 opcode,
519 u64 offset, u64 length,
520 u64 truncate_size, u32 truncate_seq)
521 {
522 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
523 opcode, 0);
524 size_t payload_len = 0;
525
526 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
527 opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
528 opcode != CEPH_OSD_OP_TRUNCATE);
529
530 op->extent.offset = offset;
531 op->extent.length = length;
532 op->extent.truncate_size = truncate_size;
533 op->extent.truncate_seq = truncate_seq;
534 if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
535 payload_len += length;
536
537 op->indata_len = payload_len;
538 }
539 EXPORT_SYMBOL(osd_req_op_extent_init);
540
541 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
542 unsigned int which, u64 length)
543 {
544 struct ceph_osd_req_op *op;
545 u64 previous;
546
547 BUG_ON(which >= osd_req->r_num_ops);
548 op = &osd_req->r_ops[which];
549 previous = op->extent.length;
550
551 if (length == previous)
552 return; /* Nothing to do */
553 BUG_ON(length > previous);
554
555 op->extent.length = length;
556 op->indata_len -= previous - length;
557 }
558 EXPORT_SYMBOL(osd_req_op_extent_update);
559
560 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
561 unsigned int which, u64 offset_inc)
562 {
563 struct ceph_osd_req_op *op, *prev_op;
564
565 BUG_ON(which + 1 >= osd_req->r_num_ops);
566
567 prev_op = &osd_req->r_ops[which];
568 op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
569 /* dup previous one */
570 op->indata_len = prev_op->indata_len;
571 op->outdata_len = prev_op->outdata_len;
572 op->extent = prev_op->extent;
573 /* adjust offset */
574 op->extent.offset += offset_inc;
575 op->extent.length -= offset_inc;
576
577 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
578 op->indata_len -= offset_inc;
579 }
580 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
581
582 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
583 u16 opcode, const char *class, const char *method)
584 {
585 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
586 opcode, 0);
587 struct ceph_pagelist *pagelist;
588 size_t payload_len = 0;
589 size_t size;
590
591 BUG_ON(opcode != CEPH_OSD_OP_CALL);
592
593 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
594 BUG_ON(!pagelist);
595 ceph_pagelist_init(pagelist);
596
597 op->cls.class_name = class;
598 size = strlen(class);
599 BUG_ON(size > (size_t) U8_MAX);
600 op->cls.class_len = size;
601 ceph_pagelist_append(pagelist, class, size);
602 payload_len += size;
603
604 op->cls.method_name = method;
605 size = strlen(method);
606 BUG_ON(size > (size_t) U8_MAX);
607 op->cls.method_len = size;
608 ceph_pagelist_append(pagelist, method, size);
609 payload_len += size;
610
611 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
612
613 op->cls.argc = 0; /* currently unused */
614
615 op->indata_len = payload_len;
616 }
617 EXPORT_SYMBOL(osd_req_op_cls_init);
618
619 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
620 u16 opcode, const char *name, const void *value,
621 size_t size, u8 cmp_op, u8 cmp_mode)
622 {
623 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
624 opcode, 0);
625 struct ceph_pagelist *pagelist;
626 size_t payload_len;
627
628 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
629
630 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
631 if (!pagelist)
632 return -ENOMEM;
633
634 ceph_pagelist_init(pagelist);
635
636 payload_len = strlen(name);
637 op->xattr.name_len = payload_len;
638 ceph_pagelist_append(pagelist, name, payload_len);
639
640 op->xattr.value_len = size;
641 ceph_pagelist_append(pagelist, value, size);
642 payload_len += size;
643
644 op->xattr.cmp_op = cmp_op;
645 op->xattr.cmp_mode = cmp_mode;
646
647 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
648 op->indata_len = payload_len;
649 return 0;
650 }
651 EXPORT_SYMBOL(osd_req_op_xattr_init);
652
653 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
654 unsigned int which, u16 opcode,
655 u64 cookie, u64 version, int flag)
656 {
657 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
658 opcode, 0);
659
660 BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
661
662 op->watch.cookie = cookie;
663 op->watch.ver = version;
664 if (opcode == CEPH_OSD_OP_WATCH && flag)
665 op->watch.flag = (u8)1;
666 }
667 EXPORT_SYMBOL(osd_req_op_watch_init);
668
669 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
670 unsigned int which,
671 u64 expected_object_size,
672 u64 expected_write_size)
673 {
674 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
675 CEPH_OSD_OP_SETALLOCHINT,
676 0);
677
678 op->alloc_hint.expected_object_size = expected_object_size;
679 op->alloc_hint.expected_write_size = expected_write_size;
680
681 /*
682 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
683 * not worth a feature bit. Set FAILOK per-op flag to make
684 * sure older osds don't trip over an unsupported opcode.
685 */
686 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
687 }
688 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
689
690 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
691 struct ceph_osd_data *osd_data)
692 {
693 u64 length = ceph_osd_data_length(osd_data);
694
695 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
696 BUG_ON(length > (u64) SIZE_MAX);
697 if (length)
698 ceph_msg_data_add_pages(msg, osd_data->pages,
699 length, osd_data->alignment);
700 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
701 BUG_ON(!length);
702 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
703 #ifdef CONFIG_BLOCK
704 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
705 ceph_msg_data_add_bio(msg, osd_data->bio, length);
706 #endif
707 } else {
708 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
709 }
710 }
711
712 static u64 osd_req_encode_op(struct ceph_osd_request *req,
713 struct ceph_osd_op *dst, unsigned int which)
714 {
715 struct ceph_osd_req_op *src;
716 struct ceph_osd_data *osd_data;
717 u64 request_data_len = 0;
718 u64 data_length;
719
720 BUG_ON(which >= req->r_num_ops);
721 src = &req->r_ops[which];
722 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
723 pr_err("unrecognized osd opcode %d\n", src->op);
724
725 return 0;
726 }
727
728 switch (src->op) {
729 case CEPH_OSD_OP_STAT:
730 osd_data = &src->raw_data_in;
731 ceph_osdc_msg_data_add(req->r_reply, osd_data);
732 break;
733 case CEPH_OSD_OP_READ:
734 case CEPH_OSD_OP_WRITE:
735 case CEPH_OSD_OP_WRITEFULL:
736 case CEPH_OSD_OP_ZERO:
737 case CEPH_OSD_OP_TRUNCATE:
738 if (src->op == CEPH_OSD_OP_WRITE ||
739 src->op == CEPH_OSD_OP_WRITEFULL)
740 request_data_len = src->extent.length;
741 dst->extent.offset = cpu_to_le64(src->extent.offset);
742 dst->extent.length = cpu_to_le64(src->extent.length);
743 dst->extent.truncate_size =
744 cpu_to_le64(src->extent.truncate_size);
745 dst->extent.truncate_seq =
746 cpu_to_le32(src->extent.truncate_seq);
747 osd_data = &src->extent.osd_data;
748 if (src->op == CEPH_OSD_OP_WRITE ||
749 src->op == CEPH_OSD_OP_WRITEFULL)
750 ceph_osdc_msg_data_add(req->r_request, osd_data);
751 else
752 ceph_osdc_msg_data_add(req->r_reply, osd_data);
753 break;
754 case CEPH_OSD_OP_CALL:
755 dst->cls.class_len = src->cls.class_len;
756 dst->cls.method_len = src->cls.method_len;
757 osd_data = &src->cls.request_info;
758 ceph_osdc_msg_data_add(req->r_request, osd_data);
759 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
760 request_data_len = osd_data->pagelist->length;
761
762 osd_data = &src->cls.request_data;
763 data_length = ceph_osd_data_length(osd_data);
764 if (data_length) {
765 BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
766 dst->cls.indata_len = cpu_to_le32(data_length);
767 ceph_osdc_msg_data_add(req->r_request, osd_data);
768 src->indata_len += data_length;
769 request_data_len += data_length;
770 }
771 osd_data = &src->cls.response_data;
772 ceph_osdc_msg_data_add(req->r_reply, osd_data);
773 break;
774 case CEPH_OSD_OP_STARTSYNC:
775 break;
776 case CEPH_OSD_OP_NOTIFY_ACK:
777 case CEPH_OSD_OP_WATCH:
778 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
779 dst->watch.ver = cpu_to_le64(src->watch.ver);
780 dst->watch.flag = src->watch.flag;
781 break;
782 case CEPH_OSD_OP_SETALLOCHINT:
783 dst->alloc_hint.expected_object_size =
784 cpu_to_le64(src->alloc_hint.expected_object_size);
785 dst->alloc_hint.expected_write_size =
786 cpu_to_le64(src->alloc_hint.expected_write_size);
787 break;
788 case CEPH_OSD_OP_SETXATTR:
789 case CEPH_OSD_OP_CMPXATTR:
790 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
791 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
792 dst->xattr.cmp_op = src->xattr.cmp_op;
793 dst->xattr.cmp_mode = src->xattr.cmp_mode;
794 osd_data = &src->xattr.osd_data;
795 ceph_osdc_msg_data_add(req->r_request, osd_data);
796 request_data_len = osd_data->pagelist->length;
797 break;
798 case CEPH_OSD_OP_CREATE:
799 case CEPH_OSD_OP_DELETE:
800 break;
801 default:
802 pr_err("unsupported osd opcode %s\n",
803 ceph_osd_op_name(src->op));
804 WARN_ON(1);
805
806 return 0;
807 }
808
809 dst->op = cpu_to_le16(src->op);
810 dst->flags = cpu_to_le32(src->flags);
811 dst->payload_len = cpu_to_le32(src->indata_len);
812
813 return request_data_len;
814 }
815
816 /*
817 * build new request AND message, calculate layout, and adjust file
818 * extent as needed.
819 *
820 * if the file was recently truncated, we include information about its
821 * old and new size so that the object can be updated appropriately. (we
822 * avoid synchronously deleting truncated objects because it's slow.)
823 *
824 * if @do_sync, include a 'startsync' command so that the osd will flush
825 * data quickly.
826 */
827 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
828 struct ceph_file_layout *layout,
829 struct ceph_vino vino,
830 u64 off, u64 *plen,
831 unsigned int which, int num_ops,
832 int opcode, int flags,
833 struct ceph_snap_context *snapc,
834 u32 truncate_seq,
835 u64 truncate_size,
836 bool use_mempool)
837 {
838 struct ceph_osd_request *req;
839 u64 objnum = 0;
840 u64 objoff = 0;
841 u64 objlen = 0;
842 int r;
843
844 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
845 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
846 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
847
848 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
849 GFP_NOFS);
850 if (!req) {
851 r = -ENOMEM;
852 goto fail;
853 }
854
855 req->r_flags = flags;
856
857 /* calculate max write size */
858 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
859 if (r)
860 goto fail;
861
862 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
863 osd_req_op_init(req, which, opcode, 0);
864 } else {
865 u32 object_size = le32_to_cpu(layout->fl_object_size);
866 u32 object_base = off - objoff;
867 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
868 if (truncate_size <= object_base) {
869 truncate_size = 0;
870 } else {
871 truncate_size -= object_base;
872 if (truncate_size > object_size)
873 truncate_size = object_size;
874 }
875 }
876 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
877 truncate_size, truncate_seq);
878 }
879
880 req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
881 ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
882
883 r = ceph_osdc_alloc_messages(req, GFP_NOFS);
884 if (r)
885 goto fail;
886
887 return req;
888
889 fail:
890 ceph_osdc_put_request(req);
891 return ERR_PTR(r);
892 }
893 EXPORT_SYMBOL(ceph_osdc_new_request);
894
895 /*
896 * We keep osd requests in an rbtree, sorted by ->r_tid.
897 */
898 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
899
900 static struct ceph_osd_request *
901 __lookup_request_ge(struct ceph_osd_client *osdc,
902 u64 tid)
903 {
904 struct ceph_osd_request *req;
905 struct rb_node *n = osdc->requests.rb_node;
906
907 while (n) {
908 req = rb_entry(n, struct ceph_osd_request, r_node);
909 if (tid < req->r_tid) {
910 if (!n->rb_left)
911 return req;
912 n = n->rb_left;
913 } else if (tid > req->r_tid) {
914 n = n->rb_right;
915 } else {
916 return req;
917 }
918 }
919 return NULL;
920 }
921
922 static void __kick_linger_request(struct ceph_osd_request *req)
923 {
924 struct ceph_osd_client *osdc = req->r_osdc;
925 struct ceph_osd *osd = req->r_osd;
926
927 /*
928 * Linger requests need to be resent with a new tid to avoid
929 * the dup op detection logic on the OSDs. Achieve this with
930 * a re-register dance instead of open-coding.
931 */
932 ceph_osdc_get_request(req);
933 if (!list_empty(&req->r_linger_item))
934 __unregister_linger_request(osdc, req);
935 else
936 __unregister_request(osdc, req);
937 __register_request(osdc, req);
938 ceph_osdc_put_request(req);
939
940 /*
941 * Unless request has been registered as both normal and
942 * lingering, __unregister{,_linger}_request clears r_osd.
943 * However, here we need to preserve r_osd to make sure we
944 * requeue on the same OSD.
945 */
946 WARN_ON(req->r_osd || !osd);
947 req->r_osd = osd;
948
949 dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
950 __enqueue_request(req);
951 }
952
953 /*
954 * Resubmit requests pending on the given osd.
955 */
956 static void __kick_osd_requests(struct ceph_osd_client *osdc,
957 struct ceph_osd *osd)
958 {
959 struct ceph_osd_request *req, *nreq;
960 LIST_HEAD(resend);
961 LIST_HEAD(resend_linger);
962 int err;
963
964 dout("%s osd%d\n", __func__, osd->o_osd);
965 err = __reset_osd(osdc, osd);
966 if (err)
967 return;
968
969 /*
970 * Build up a list of requests to resend by traversing the
971 * osd's list of requests. Requests for a given object are
972 * sent in tid order, and that is also the order they're
973 * kept on this list. Therefore all requests that are in
974 * flight will be found first, followed by all requests that
975 * have not yet been sent. And to resend requests while
976 * preserving this order we will want to put any sent
977 * requests back on the front of the osd client's unsent
978 * list.
979 *
980 * So we build a separate ordered list of already-sent
981 * requests for the affected osd and splice it onto the
982 * front of the osd client's unsent list. Once we've seen a
983 * request that has not yet been sent we're done. Those
984 * requests are already sitting right where they belong.
985 */
986 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
987 if (!req->r_sent)
988 break;
989
990 if (!req->r_linger) {
991 dout("%s requeueing %p tid %llu\n", __func__, req,
992 req->r_tid);
993 list_move_tail(&req->r_req_lru_item, &resend);
994 req->r_flags |= CEPH_OSD_FLAG_RETRY;
995 } else {
996 list_move_tail(&req->r_req_lru_item, &resend_linger);
997 }
998 }
999 list_splice(&resend, &osdc->req_unsent);
1000
1001 /*
1002 * Both registered and not yet registered linger requests are
1003 * enqueued with a new tid on the same OSD. We add/move them
1004 * to req_unsent/o_requests at the end to keep things in tid
1005 * order.
1006 */
1007 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
1008 r_linger_osd_item) {
1009 WARN_ON(!list_empty(&req->r_req_lru_item));
1010 __kick_linger_request(req);
1011 }
1012
1013 list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
1014 __kick_linger_request(req);
1015 }
1016
1017 /*
1018 * If the osd connection drops, we need to resubmit all requests.
1019 */
1020 static void osd_reset(struct ceph_connection *con)
1021 {
1022 struct ceph_osd *osd = con->private;
1023 struct ceph_osd_client *osdc;
1024
1025 if (!osd)
1026 return;
1027 dout("osd_reset osd%d\n", osd->o_osd);
1028 osdc = osd->o_osdc;
1029 down_read(&osdc->map_sem);
1030 mutex_lock(&osdc->request_mutex);
1031 __kick_osd_requests(osdc, osd);
1032 __send_queued(osdc);
1033 mutex_unlock(&osdc->request_mutex);
1034 up_read(&osdc->map_sem);
1035 }
1036
1037 /*
1038 * Track open sessions with osds.
1039 */
1040 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1041 {
1042 struct ceph_osd *osd;
1043
1044 osd = kzalloc(sizeof(*osd), GFP_NOFS);
1045 if (!osd)
1046 return NULL;
1047
1048 atomic_set(&osd->o_ref, 1);
1049 osd->o_osdc = osdc;
1050 osd->o_osd = onum;
1051 RB_CLEAR_NODE(&osd->o_node);
1052 INIT_LIST_HEAD(&osd->o_requests);
1053 INIT_LIST_HEAD(&osd->o_linger_requests);
1054 INIT_LIST_HEAD(&osd->o_osd_lru);
1055 osd->o_incarnation = 1;
1056
1057 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1058
1059 INIT_LIST_HEAD(&osd->o_keepalive_item);
1060 return osd;
1061 }
1062
1063 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1064 {
1065 if (atomic_inc_not_zero(&osd->o_ref)) {
1066 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1067 atomic_read(&osd->o_ref));
1068 return osd;
1069 } else {
1070 dout("get_osd %p FAIL\n", osd);
1071 return NULL;
1072 }
1073 }
1074
1075 static void put_osd(struct ceph_osd *osd)
1076 {
1077 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1078 atomic_read(&osd->o_ref) - 1);
1079 if (atomic_dec_and_test(&osd->o_ref)) {
1080 if (osd->o_auth.authorizer)
1081 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1082 kfree(osd);
1083 }
1084 }
1085
1086 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1087
1088 /*
1089 * remove an osd from our map
1090 */
1091 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1092 {
1093 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1094 WARN_ON(!list_empty(&osd->o_requests));
1095 WARN_ON(!list_empty(&osd->o_linger_requests));
1096
1097 list_del_init(&osd->o_osd_lru);
1098 erase_osd(&osdc->osds, osd);
1099 }
1100
1101 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1102 {
1103 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1104
1105 if (!RB_EMPTY_NODE(&osd->o_node)) {
1106 ceph_con_close(&osd->o_con);
1107 __remove_osd(osdc, osd);
1108 put_osd(osd);
1109 }
1110 }
1111
1112 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1113 struct ceph_osd *osd)
1114 {
1115 dout("%s %p\n", __func__, osd);
1116 BUG_ON(!list_empty(&osd->o_osd_lru));
1117
1118 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1119 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1120 }
1121
1122 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1123 struct ceph_osd *osd)
1124 {
1125 dout("%s %p\n", __func__, osd);
1126
1127 if (list_empty(&osd->o_requests) &&
1128 list_empty(&osd->o_linger_requests))
1129 __move_osd_to_lru(osdc, osd);
1130 }
1131
1132 static void __remove_osd_from_lru(struct ceph_osd *osd)
1133 {
1134 dout("__remove_osd_from_lru %p\n", osd);
1135 if (!list_empty(&osd->o_osd_lru))
1136 list_del_init(&osd->o_osd_lru);
1137 }
1138
1139 /*
1140 * reset osd connect
1141 */
1142 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1143 {
1144 struct ceph_entity_addr *peer_addr;
1145
1146 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1147 if (list_empty(&osd->o_requests) &&
1148 list_empty(&osd->o_linger_requests)) {
1149 remove_osd(osdc, osd);
1150 return -ENODEV;
1151 }
1152
1153 peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1154 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1155 !ceph_con_opened(&osd->o_con)) {
1156 struct ceph_osd_request *req;
1157
1158 dout("osd addr hasn't changed and connection never opened, "
1159 "letting msgr retry\n");
1160 /* touch each r_stamp for handle_timeout()'s benfit */
1161 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1162 req->r_stamp = jiffies;
1163
1164 return -EAGAIN;
1165 }
1166
1167 ceph_con_close(&osd->o_con);
1168 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1169 osd->o_incarnation++;
1170
1171 return 0;
1172 }
1173
1174 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1175 {
1176 schedule_delayed_work(&osdc->timeout_work,
1177 osdc->client->options->osd_keepalive_timeout);
1178 }
1179
1180 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1181 {
1182 cancel_delayed_work(&osdc->timeout_work);
1183 }
1184
1185 /*
1186 * Register request, assign tid. If this is the first request, set up
1187 * the timeout event.
1188 */
1189 static void __register_request(struct ceph_osd_client *osdc,
1190 struct ceph_osd_request *req)
1191 {
1192 req->r_tid = ++osdc->last_tid;
1193 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1194 dout("__register_request %p tid %lld\n", req, req->r_tid);
1195 insert_request(&osdc->requests, req);
1196 ceph_osdc_get_request(req);
1197 osdc->num_requests++;
1198 if (osdc->num_requests == 1) {
1199 dout(" first request, scheduling timeout\n");
1200 __schedule_osd_timeout(osdc);
1201 }
1202 }
1203
1204 /*
1205 * called under osdc->request_mutex
1206 */
1207 static void __unregister_request(struct ceph_osd_client *osdc,
1208 struct ceph_osd_request *req)
1209 {
1210 if (RB_EMPTY_NODE(&req->r_node)) {
1211 dout("__unregister_request %p tid %lld not registered\n",
1212 req, req->r_tid);
1213 return;
1214 }
1215
1216 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1217 erase_request(&osdc->requests, req);
1218 osdc->num_requests--;
1219
1220 if (req->r_osd) {
1221 /* make sure the original request isn't in flight. */
1222 ceph_msg_revoke(req->r_request);
1223
1224 list_del_init(&req->r_osd_item);
1225 maybe_move_osd_to_lru(osdc, req->r_osd);
1226 if (list_empty(&req->r_linger_osd_item))
1227 req->r_osd = NULL;
1228 }
1229
1230 list_del_init(&req->r_req_lru_item);
1231 ceph_osdc_put_request(req);
1232
1233 if (osdc->num_requests == 0) {
1234 dout(" no requests, canceling timeout\n");
1235 __cancel_osd_timeout(osdc);
1236 }
1237 }
1238
1239 /*
1240 * Cancel a previously queued request message
1241 */
1242 static void __cancel_request(struct ceph_osd_request *req)
1243 {
1244 if (req->r_sent && req->r_osd) {
1245 ceph_msg_revoke(req->r_request);
1246 req->r_sent = 0;
1247 }
1248 }
1249
1250 static void __register_linger_request(struct ceph_osd_client *osdc,
1251 struct ceph_osd_request *req)
1252 {
1253 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1254 WARN_ON(!req->r_linger);
1255
1256 ceph_osdc_get_request(req);
1257 list_add_tail(&req->r_linger_item, &osdc->req_linger);
1258 if (req->r_osd)
1259 list_add_tail(&req->r_linger_osd_item,
1260 &req->r_osd->o_linger_requests);
1261 }
1262
1263 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1264 struct ceph_osd_request *req)
1265 {
1266 WARN_ON(!req->r_linger);
1267
1268 if (list_empty(&req->r_linger_item)) {
1269 dout("%s %p tid %llu not registered\n", __func__, req,
1270 req->r_tid);
1271 return;
1272 }
1273
1274 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1275 list_del_init(&req->r_linger_item);
1276
1277 if (req->r_osd) {
1278 list_del_init(&req->r_linger_osd_item);
1279 maybe_move_osd_to_lru(osdc, req->r_osd);
1280 if (list_empty(&req->r_osd_item))
1281 req->r_osd = NULL;
1282 }
1283 ceph_osdc_put_request(req);
1284 }
1285
1286 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1287 struct ceph_osd_request *req)
1288 {
1289 if (!req->r_linger) {
1290 dout("set_request_linger %p\n", req);
1291 req->r_linger = 1;
1292 }
1293 }
1294 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1295
1296 static bool __pool_full(struct ceph_pg_pool_info *pi)
1297 {
1298 return pi->flags & CEPH_POOL_FLAG_FULL;
1299 }
1300
1301 /*
1302 * Returns whether a request should be blocked from being sent
1303 * based on the current osdmap and osd_client settings.
1304 *
1305 * Caller should hold map_sem for read.
1306 */
1307 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1308 const struct ceph_osd_request_target *t,
1309 struct ceph_pg_pool_info *pi)
1310 {
1311 bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1312 bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1313 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
1314 __pool_full(pi);
1315
1316 WARN_ON(pi->id != t->base_oloc.pool);
1317 return (t->flags & CEPH_OSD_FLAG_READ && pauserd) ||
1318 (t->flags & CEPH_OSD_FLAG_WRITE && pausewr);
1319 }
1320
1321 enum calc_target_result {
1322 CALC_TARGET_NO_ACTION = 0,
1323 CALC_TARGET_NEED_RESEND,
1324 CALC_TARGET_POOL_DNE,
1325 };
1326
1327 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1328 struct ceph_osd_request_target *t,
1329 u32 *last_force_resend,
1330 bool any_change)
1331 {
1332 struct ceph_pg_pool_info *pi;
1333 struct ceph_pg pgid, last_pgid;
1334 struct ceph_osds up, acting;
1335 bool force_resend = false;
1336 bool need_check_tiering = false;
1337 bool need_resend = false;
1338 bool sort_bitwise = ceph_osdmap_flag(osdc->osdmap,
1339 CEPH_OSDMAP_SORTBITWISE);
1340 enum calc_target_result ct_res;
1341 int ret;
1342
1343 pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1344 if (!pi) {
1345 t->osd = CEPH_HOMELESS_OSD;
1346 ct_res = CALC_TARGET_POOL_DNE;
1347 goto out;
1348 }
1349
1350 if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1351 if (last_force_resend &&
1352 *last_force_resend < pi->last_force_request_resend) {
1353 *last_force_resend = pi->last_force_request_resend;
1354 force_resend = true;
1355 } else if (!last_force_resend) {
1356 force_resend = true;
1357 }
1358 }
1359 if (ceph_oid_empty(&t->target_oid) || force_resend) {
1360 ceph_oid_copy(&t->target_oid, &t->base_oid);
1361 need_check_tiering = true;
1362 }
1363 if (ceph_oloc_empty(&t->target_oloc) || force_resend) {
1364 ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1365 need_check_tiering = true;
1366 }
1367
1368 if (need_check_tiering &&
1369 (t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1370 if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
1371 t->target_oloc.pool = pi->read_tier;
1372 if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
1373 t->target_oloc.pool = pi->write_tier;
1374 }
1375
1376 ret = ceph_object_locator_to_pg(osdc->osdmap, &t->target_oid,
1377 &t->target_oloc, &pgid);
1378 if (ret) {
1379 WARN_ON(ret != -ENOENT);
1380 t->osd = CEPH_HOMELESS_OSD;
1381 ct_res = CALC_TARGET_POOL_DNE;
1382 goto out;
1383 }
1384 last_pgid.pool = pgid.pool;
1385 last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1386
1387 ceph_pg_to_up_acting_osds(osdc->osdmap, &pgid, &up, &acting);
1388 if (any_change &&
1389 ceph_is_new_interval(&t->acting,
1390 &acting,
1391 &t->up,
1392 &up,
1393 t->size,
1394 pi->size,
1395 t->min_size,
1396 pi->min_size,
1397 t->pg_num,
1398 pi->pg_num,
1399 t->sort_bitwise,
1400 sort_bitwise,
1401 &last_pgid))
1402 force_resend = true;
1403
1404 if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1405 t->paused = false;
1406 need_resend = true;
1407 }
1408
1409 if (ceph_pg_compare(&t->pgid, &pgid) ||
1410 ceph_osds_changed(&t->acting, &acting, any_change) ||
1411 force_resend) {
1412 t->pgid = pgid; /* struct */
1413 ceph_osds_copy(&t->acting, &acting);
1414 ceph_osds_copy(&t->up, &up);
1415 t->size = pi->size;
1416 t->min_size = pi->min_size;
1417 t->pg_num = pi->pg_num;
1418 t->pg_num_mask = pi->pg_num_mask;
1419 t->sort_bitwise = sort_bitwise;
1420
1421 t->osd = acting.primary;
1422 need_resend = true;
1423 }
1424
1425 ct_res = need_resend ? CALC_TARGET_NEED_RESEND : CALC_TARGET_NO_ACTION;
1426 out:
1427 dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
1428 return ct_res;
1429 }
1430
1431 static void __enqueue_request(struct ceph_osd_request *req)
1432 {
1433 struct ceph_osd_client *osdc = req->r_osdc;
1434
1435 dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1436 req->r_osd ? req->r_osd->o_osd : -1);
1437
1438 if (req->r_osd) {
1439 __remove_osd_from_lru(req->r_osd);
1440 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1441 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1442 } else {
1443 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1444 }
1445 }
1446
1447 /*
1448 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1449 * (as needed), and set the request r_osd appropriately. If there is
1450 * no up osd, set r_osd to NULL. Move the request to the appropriate list
1451 * (unsent, homeless) or leave on in-flight lru.
1452 *
1453 * Return 0 if unchanged, 1 if changed, or negative on error.
1454 *
1455 * Caller should hold map_sem for read and request_mutex.
1456 */
1457 static int __map_request(struct ceph_osd_client *osdc,
1458 struct ceph_osd_request *req, int force_resend)
1459 {
1460 enum calc_target_result ct_res;
1461 int err;
1462
1463 dout("map_request %p tid %lld\n", req, req->r_tid);
1464
1465 ct_res = calc_target(osdc, &req->r_t, NULL, force_resend);
1466 switch (ct_res) {
1467 case CALC_TARGET_POOL_DNE:
1468 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1469 return -EIO;
1470 case CALC_TARGET_NO_ACTION:
1471 return 0; /* no change */
1472 default:
1473 BUG_ON(ct_res != CALC_TARGET_NEED_RESEND);
1474 }
1475
1476 dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1477 req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed, req->r_t.osd,
1478 req->r_osd ? req->r_osd->o_osd : -1);
1479
1480 if (req->r_osd) {
1481 __cancel_request(req);
1482 list_del_init(&req->r_osd_item);
1483 list_del_init(&req->r_linger_osd_item);
1484 req->r_osd = NULL;
1485 }
1486
1487 req->r_osd = lookup_osd(&osdc->osds, req->r_t.osd);
1488 if (!req->r_osd && req->r_t.osd >= 0) {
1489 err = -ENOMEM;
1490 req->r_osd = create_osd(osdc, req->r_t.osd);
1491 if (!req->r_osd) {
1492 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1493 goto out;
1494 }
1495
1496 dout("map_request osd %p is osd%d\n", req->r_osd,
1497 req->r_osd->o_osd);
1498 insert_osd(&osdc->osds, req->r_osd);
1499
1500 ceph_con_open(&req->r_osd->o_con,
1501 CEPH_ENTITY_TYPE_OSD, req->r_osd->o_osd,
1502 &osdc->osdmap->osd_addr[req->r_osd->o_osd]);
1503 }
1504
1505 __enqueue_request(req);
1506 err = 1; /* osd or pg changed */
1507
1508 out:
1509 return err;
1510 }
1511
1512 /*
1513 * caller should hold map_sem (for read) and request_mutex
1514 */
1515 static void __send_request(struct ceph_osd_client *osdc,
1516 struct ceph_osd_request *req)
1517 {
1518 void *p;
1519
1520 dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1521 req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1522 req->r_t.pgid.pool, req->r_t.pgid.seed);
1523
1524 /* fill in message content that changes each time we send it */
1525 put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1526 put_unaligned_le32(req->r_flags, req->r_request_flags);
1527 put_unaligned_le64(req->r_t.target_oloc.pool, req->r_request_pool);
1528 p = req->r_request_pgid;
1529 ceph_encode_64(&p, req->r_t.pgid.pool);
1530 ceph_encode_32(&p, req->r_t.pgid.seed);
1531 put_unaligned_le64(1, req->r_request_attempts); /* FIXME */
1532 memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1533 sizeof(req->r_reassert_version));
1534
1535 req->r_stamp = jiffies;
1536 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1537
1538 ceph_msg_get(req->r_request); /* send consumes a ref */
1539
1540 req->r_sent = req->r_osd->o_incarnation;
1541
1542 ceph_con_send(&req->r_osd->o_con, req->r_request);
1543 }
1544
1545 /*
1546 * Send any requests in the queue (req_unsent).
1547 */
1548 static void __send_queued(struct ceph_osd_client *osdc)
1549 {
1550 struct ceph_osd_request *req, *tmp;
1551
1552 dout("__send_queued\n");
1553 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1554 __send_request(osdc, req);
1555 }
1556
1557 /*
1558 * Caller should hold map_sem for read and request_mutex.
1559 */
1560 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1561 struct ceph_osd_request *req,
1562 bool nofail)
1563 {
1564 int rc;
1565
1566 __register_request(osdc, req);
1567 req->r_sent = 0;
1568 req->r_got_reply = 0;
1569 rc = __map_request(osdc, req, 0);
1570 if (rc < 0) {
1571 if (nofail) {
1572 dout("osdc_start_request failed map, "
1573 " will retry %lld\n", req->r_tid);
1574 rc = 0;
1575 } else {
1576 __unregister_request(osdc, req);
1577 }
1578 return rc;
1579 }
1580
1581 if (req->r_osd == NULL) {
1582 dout("send_request %p no up osds in pg\n", req);
1583 ceph_monc_request_next_osdmap(&osdc->client->monc);
1584 } else {
1585 __send_queued(osdc);
1586 }
1587
1588 return 0;
1589 }
1590
1591 /*
1592 * Timeout callback, called every N seconds when 1 or more osd
1593 * requests has been active for more than N seconds. When this
1594 * happens, we ping all OSDs with requests who have timed out to
1595 * ensure any communications channel reset is detected. Reset the
1596 * request timeouts another N seconds in the future as we go.
1597 * Reschedule the timeout event another N seconds in future (unless
1598 * there are no open requests).
1599 */
1600 static void handle_timeout(struct work_struct *work)
1601 {
1602 struct ceph_osd_client *osdc =
1603 container_of(work, struct ceph_osd_client, timeout_work.work);
1604 struct ceph_options *opts = osdc->client->options;
1605 struct ceph_osd_request *req;
1606 struct ceph_osd *osd;
1607 struct list_head slow_osds;
1608 dout("timeout\n");
1609 down_read(&osdc->map_sem);
1610
1611 ceph_monc_request_next_osdmap(&osdc->client->monc);
1612
1613 mutex_lock(&osdc->request_mutex);
1614
1615 /*
1616 * ping osds that are a bit slow. this ensures that if there
1617 * is a break in the TCP connection we will notice, and reopen
1618 * a connection with that osd (from the fault callback).
1619 */
1620 INIT_LIST_HEAD(&slow_osds);
1621 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1622 if (time_before(jiffies,
1623 req->r_stamp + opts->osd_keepalive_timeout))
1624 break;
1625
1626 osd = req->r_osd;
1627 BUG_ON(!osd);
1628 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1629 req->r_tid, osd->o_osd);
1630 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1631 }
1632 while (!list_empty(&slow_osds)) {
1633 osd = list_entry(slow_osds.next, struct ceph_osd,
1634 o_keepalive_item);
1635 list_del_init(&osd->o_keepalive_item);
1636 ceph_con_keepalive(&osd->o_con);
1637 }
1638
1639 __schedule_osd_timeout(osdc);
1640 __send_queued(osdc);
1641 mutex_unlock(&osdc->request_mutex);
1642 up_read(&osdc->map_sem);
1643 }
1644
1645 static void handle_osds_timeout(struct work_struct *work)
1646 {
1647 struct ceph_osd_client *osdc =
1648 container_of(work, struct ceph_osd_client,
1649 osds_timeout_work.work);
1650 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
1651 struct ceph_osd *osd, *nosd;
1652
1653 dout("%s osdc %p\n", __func__, osdc);
1654 down_read(&osdc->map_sem);
1655 mutex_lock(&osdc->request_mutex);
1656
1657 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1658 if (time_before(jiffies, osd->lru_ttl))
1659 break;
1660
1661 remove_osd(osdc, osd);
1662 }
1663
1664 mutex_unlock(&osdc->request_mutex);
1665 up_read(&osdc->map_sem);
1666 schedule_delayed_work(&osdc->osds_timeout_work,
1667 round_jiffies_relative(delay));
1668 }
1669
1670 static int ceph_oloc_decode(void **p, void *end,
1671 struct ceph_object_locator *oloc)
1672 {
1673 u8 struct_v, struct_cv;
1674 u32 len;
1675 void *struct_end;
1676 int ret = 0;
1677
1678 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1679 struct_v = ceph_decode_8(p);
1680 struct_cv = ceph_decode_8(p);
1681 if (struct_v < 3) {
1682 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1683 struct_v, struct_cv);
1684 goto e_inval;
1685 }
1686 if (struct_cv > 6) {
1687 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1688 struct_v, struct_cv);
1689 goto e_inval;
1690 }
1691 len = ceph_decode_32(p);
1692 ceph_decode_need(p, end, len, e_inval);
1693 struct_end = *p + len;
1694
1695 oloc->pool = ceph_decode_64(p);
1696 *p += 4; /* skip preferred */
1697
1698 len = ceph_decode_32(p);
1699 if (len > 0) {
1700 pr_warn("ceph_object_locator::key is set\n");
1701 goto e_inval;
1702 }
1703
1704 if (struct_v >= 5) {
1705 len = ceph_decode_32(p);
1706 if (len > 0) {
1707 pr_warn("ceph_object_locator::nspace is set\n");
1708 goto e_inval;
1709 }
1710 }
1711
1712 if (struct_v >= 6) {
1713 s64 hash = ceph_decode_64(p);
1714 if (hash != -1) {
1715 pr_warn("ceph_object_locator::hash is set\n");
1716 goto e_inval;
1717 }
1718 }
1719
1720 /* skip the rest */
1721 *p = struct_end;
1722 out:
1723 return ret;
1724
1725 e_inval:
1726 ret = -EINVAL;
1727 goto out;
1728 }
1729
1730 static int ceph_redirect_decode(void **p, void *end,
1731 struct ceph_request_redirect *redir)
1732 {
1733 u8 struct_v, struct_cv;
1734 u32 len;
1735 void *struct_end;
1736 int ret;
1737
1738 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1739 struct_v = ceph_decode_8(p);
1740 struct_cv = ceph_decode_8(p);
1741 if (struct_cv > 1) {
1742 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1743 struct_v, struct_cv);
1744 goto e_inval;
1745 }
1746 len = ceph_decode_32(p);
1747 ceph_decode_need(p, end, len, e_inval);
1748 struct_end = *p + len;
1749
1750 ret = ceph_oloc_decode(p, end, &redir->oloc);
1751 if (ret)
1752 goto out;
1753
1754 len = ceph_decode_32(p);
1755 if (len > 0) {
1756 pr_warn("ceph_request_redirect::object_name is set\n");
1757 goto e_inval;
1758 }
1759
1760 len = ceph_decode_32(p);
1761 *p += len; /* skip osd_instructions */
1762
1763 /* skip the rest */
1764 *p = struct_end;
1765 out:
1766 return ret;
1767
1768 e_inval:
1769 ret = -EINVAL;
1770 goto out;
1771 }
1772
1773 static void complete_request(struct ceph_osd_request *req)
1774 {
1775 complete_all(&req->r_safe_completion); /* fsync waiter */
1776 }
1777
1778 /*
1779 * handle osd op reply. either call the callback if it is specified,
1780 * or do the completion to wake up the waiting thread.
1781 */
1782 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1783 {
1784 void *p, *end;
1785 struct ceph_osd_request *req;
1786 struct ceph_request_redirect redir;
1787 u64 tid;
1788 int object_len;
1789 unsigned int numops;
1790 int payload_len, flags;
1791 s32 result;
1792 s32 retry_attempt;
1793 struct ceph_pg pg;
1794 int err;
1795 u32 reassert_epoch;
1796 u64 reassert_version;
1797 u32 osdmap_epoch;
1798 int already_completed;
1799 u32 bytes;
1800 u8 decode_redir;
1801 unsigned int i;
1802
1803 tid = le64_to_cpu(msg->hdr.tid);
1804 dout("handle_reply %p tid %llu\n", msg, tid);
1805
1806 p = msg->front.iov_base;
1807 end = p + msg->front.iov_len;
1808
1809 ceph_decode_need(&p, end, 4, bad);
1810 object_len = ceph_decode_32(&p);
1811 ceph_decode_need(&p, end, object_len, bad);
1812 p += object_len;
1813
1814 err = ceph_decode_pgid(&p, end, &pg);
1815 if (err)
1816 goto bad;
1817
1818 ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1819 flags = ceph_decode_64(&p);
1820 result = ceph_decode_32(&p);
1821 reassert_epoch = ceph_decode_32(&p);
1822 reassert_version = ceph_decode_64(&p);
1823 osdmap_epoch = ceph_decode_32(&p);
1824
1825 /* lookup */
1826 down_read(&osdc->map_sem);
1827 mutex_lock(&osdc->request_mutex);
1828 req = lookup_request(&osdc->requests, tid);
1829 if (req == NULL) {
1830 dout("handle_reply tid %llu dne\n", tid);
1831 goto bad_mutex;
1832 }
1833 ceph_osdc_get_request(req);
1834
1835 dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1836 req, result);
1837
1838 ceph_decode_need(&p, end, 4, bad_put);
1839 numops = ceph_decode_32(&p);
1840 if (numops > CEPH_OSD_MAX_OPS)
1841 goto bad_put;
1842 if (numops != req->r_num_ops)
1843 goto bad_put;
1844 payload_len = 0;
1845 ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1846 for (i = 0; i < numops; i++) {
1847 struct ceph_osd_op *op = p;
1848 int len;
1849
1850 len = le32_to_cpu(op->payload_len);
1851 req->r_ops[i].outdata_len = len;
1852 dout(" op %d has %d bytes\n", i, len);
1853 payload_len += len;
1854 p += sizeof(*op);
1855 }
1856 bytes = le32_to_cpu(msg->hdr.data_len);
1857 if (payload_len != bytes) {
1858 pr_warn("sum of op payload lens %d != data_len %d\n",
1859 payload_len, bytes);
1860 goto bad_put;
1861 }
1862
1863 ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1864 retry_attempt = ceph_decode_32(&p);
1865 for (i = 0; i < numops; i++)
1866 req->r_ops[i].rval = ceph_decode_32(&p);
1867
1868 if (le16_to_cpu(msg->hdr.version) >= 6) {
1869 p += 8 + 4; /* skip replay_version */
1870 p += 8; /* skip user_version */
1871
1872 if (le16_to_cpu(msg->hdr.version) >= 7)
1873 ceph_decode_8_safe(&p, end, decode_redir, bad_put);
1874 else
1875 decode_redir = 1;
1876 } else {
1877 decode_redir = 0;
1878 }
1879
1880 if (decode_redir) {
1881 err = ceph_redirect_decode(&p, end, &redir);
1882 if (err)
1883 goto bad_put;
1884 } else {
1885 redir.oloc.pool = -1;
1886 }
1887
1888 if (!ceph_oloc_empty(&redir.oloc)) {
1889 dout("redirect pool %lld\n", redir.oloc.pool);
1890
1891 __unregister_request(osdc, req);
1892
1893 ceph_oloc_copy(&req->r_t.target_oloc, &redir.oloc);
1894
1895 /*
1896 * Start redirect requests with nofail=true. If
1897 * mapping fails, request will end up on the notarget
1898 * list, waiting for the new osdmap (which can take
1899 * a while), even though the original request mapped
1900 * successfully. In the future we might want to follow
1901 * original request's nofail setting here.
1902 */
1903 err = __ceph_osdc_start_request(osdc, req, true);
1904 BUG_ON(err);
1905
1906 goto out_unlock;
1907 }
1908
1909 already_completed = req->r_got_reply;
1910 if (!req->r_got_reply) {
1911 req->r_result = result;
1912 dout("handle_reply result %d bytes %d\n", req->r_result,
1913 bytes);
1914 if (req->r_result == 0)
1915 req->r_result = bytes;
1916
1917 /* in case this is a write and we need to replay, */
1918 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1919 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1920
1921 req->r_got_reply = 1;
1922 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1923 dout("handle_reply tid %llu dup ack\n", tid);
1924 goto out_unlock;
1925 }
1926
1927 dout("handle_reply tid %llu flags %d\n", tid, flags);
1928
1929 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1930 __register_linger_request(osdc, req);
1931
1932 /* either this is a read, or we got the safe response */
1933 if (result < 0 ||
1934 (flags & CEPH_OSD_FLAG_ONDISK) ||
1935 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1936 __unregister_request(osdc, req);
1937
1938 mutex_unlock(&osdc->request_mutex);
1939 up_read(&osdc->map_sem);
1940
1941 if (!already_completed) {
1942 if (req->r_unsafe_callback &&
1943 result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1944 req->r_unsafe_callback(req, true);
1945 if (req->r_callback)
1946 req->r_callback(req, msg);
1947 else
1948 complete_all(&req->r_completion);
1949 }
1950
1951 if (flags & CEPH_OSD_FLAG_ONDISK) {
1952 if (req->r_unsafe_callback && already_completed)
1953 req->r_unsafe_callback(req, false);
1954 complete_request(req);
1955 }
1956
1957 out:
1958 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1959 ceph_osdc_put_request(req);
1960 return;
1961 out_unlock:
1962 mutex_unlock(&osdc->request_mutex);
1963 up_read(&osdc->map_sem);
1964 goto out;
1965
1966 bad_put:
1967 req->r_result = -EIO;
1968 __unregister_request(osdc, req);
1969 if (req->r_callback)
1970 req->r_callback(req, msg);
1971 else
1972 complete_all(&req->r_completion);
1973 complete_request(req);
1974 ceph_osdc_put_request(req);
1975 bad_mutex:
1976 mutex_unlock(&osdc->request_mutex);
1977 up_read(&osdc->map_sem);
1978 bad:
1979 pr_err("corrupt osd_op_reply got %d %d\n",
1980 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1981 ceph_msg_dump(msg);
1982 }
1983
1984 static void reset_changed_osds(struct ceph_osd_client *osdc)
1985 {
1986 struct rb_node *p, *n;
1987
1988 dout("%s %p\n", __func__, osdc);
1989 for (p = rb_first(&osdc->osds); p; p = n) {
1990 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1991
1992 n = rb_next(p);
1993 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1994 memcmp(&osd->o_con.peer_addr,
1995 ceph_osd_addr(osdc->osdmap,
1996 osd->o_osd),
1997 sizeof(struct ceph_entity_addr)) != 0)
1998 __reset_osd(osdc, osd);
1999 }
2000 }
2001
2002 /*
2003 * Requeue requests whose mapping to an OSD has changed. If requests map to
2004 * no osd, request a new map.
2005 *
2006 * Caller should hold map_sem for read.
2007 */
2008 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
2009 bool force_resend_writes)
2010 {
2011 struct ceph_osd_request *req, *nreq;
2012 struct rb_node *p;
2013 int needmap = 0;
2014 int err;
2015 bool force_resend_req;
2016
2017 dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
2018 force_resend_writes ? " (force resend writes)" : "");
2019 mutex_lock(&osdc->request_mutex);
2020 for (p = rb_first(&osdc->requests); p; ) {
2021 req = rb_entry(p, struct ceph_osd_request, r_node);
2022 p = rb_next(p);
2023
2024 /*
2025 * For linger requests that have not yet been
2026 * registered, move them to the linger list; they'll
2027 * be sent to the osd in the loop below. Unregister
2028 * the request before re-registering it as a linger
2029 * request to ensure the __map_request() below
2030 * will decide it needs to be sent.
2031 */
2032 if (req->r_linger && list_empty(&req->r_linger_item)) {
2033 dout("%p tid %llu restart on osd%d\n",
2034 req, req->r_tid,
2035 req->r_osd ? req->r_osd->o_osd : -1);
2036 ceph_osdc_get_request(req);
2037 __unregister_request(osdc, req);
2038 __register_linger_request(osdc, req);
2039 ceph_osdc_put_request(req);
2040 continue;
2041 }
2042
2043 force_resend_req = force_resend ||
2044 (force_resend_writes &&
2045 req->r_flags & CEPH_OSD_FLAG_WRITE);
2046 err = __map_request(osdc, req, force_resend_req);
2047 if (err < 0)
2048 continue; /* error */
2049 if (req->r_osd == NULL) {
2050 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2051 needmap++; /* request a newer map */
2052 } else if (err > 0) {
2053 if (!req->r_linger) {
2054 dout("%p tid %llu requeued on osd%d\n", req,
2055 req->r_tid,
2056 req->r_osd ? req->r_osd->o_osd : -1);
2057 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2058 }
2059 }
2060 }
2061
2062 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2063 r_linger_item) {
2064 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2065
2066 err = __map_request(osdc, req,
2067 force_resend || force_resend_writes);
2068 dout("__map_request returned %d\n", err);
2069 if (err < 0)
2070 continue; /* hrm! */
2071 if (req->r_osd == NULL || err > 0) {
2072 if (req->r_osd == NULL) {
2073 dout("lingering %p tid %llu maps to no osd\n",
2074 req, req->r_tid);
2075 /*
2076 * A homeless lingering request makes
2077 * no sense, as it's job is to keep
2078 * a particular OSD connection open.
2079 * Request a newer map and kick the
2080 * request, knowing that it won't be
2081 * resent until we actually get a map
2082 * that can tell us where to send it.
2083 */
2084 needmap++;
2085 }
2086
2087 dout("kicking lingering %p tid %llu osd%d\n", req,
2088 req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2089 __register_request(osdc, req);
2090 __unregister_linger_request(osdc, req);
2091 }
2092 }
2093 reset_changed_osds(osdc);
2094 mutex_unlock(&osdc->request_mutex);
2095
2096 if (needmap) {
2097 dout("%d requests for down osds, need new map\n", needmap);
2098 ceph_monc_request_next_osdmap(&osdc->client->monc);
2099 }
2100 }
2101
2102
2103 /*
2104 * Process updated osd map.
2105 *
2106 * The message contains any number of incremental and full maps, normally
2107 * indicating some sort of topology change in the cluster. Kick requests
2108 * off to different OSDs as needed.
2109 */
2110 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2111 {
2112 void *p, *end, *next;
2113 u32 nr_maps, maplen;
2114 u32 epoch;
2115 struct ceph_osdmap *newmap = NULL, *oldmap;
2116 int err;
2117 struct ceph_fsid fsid;
2118 bool was_full;
2119
2120 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2121 p = msg->front.iov_base;
2122 end = p + msg->front.iov_len;
2123
2124 /* verify fsid */
2125 ceph_decode_need(&p, end, sizeof(fsid), bad);
2126 ceph_decode_copy(&p, &fsid, sizeof(fsid));
2127 if (ceph_check_fsid(osdc->client, &fsid) < 0)
2128 return;
2129
2130 down_write(&osdc->map_sem);
2131
2132 was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2133
2134 /* incremental maps */
2135 ceph_decode_32_safe(&p, end, nr_maps, bad);
2136 dout(" %d inc maps\n", nr_maps);
2137 while (nr_maps > 0) {
2138 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2139 epoch = ceph_decode_32(&p);
2140 maplen = ceph_decode_32(&p);
2141 ceph_decode_need(&p, end, maplen, bad);
2142 next = p + maplen;
2143 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2144 dout("applying incremental map %u len %d\n",
2145 epoch, maplen);
2146 newmap = osdmap_apply_incremental(&p, next,
2147 osdc->osdmap);
2148 if (IS_ERR(newmap)) {
2149 err = PTR_ERR(newmap);
2150 goto bad;
2151 }
2152 BUG_ON(!newmap);
2153 if (newmap != osdc->osdmap) {
2154 ceph_osdmap_destroy(osdc->osdmap);
2155 osdc->osdmap = newmap;
2156 }
2157 was_full = was_full ||
2158 ceph_osdmap_flag(osdc->osdmap,
2159 CEPH_OSDMAP_FULL);
2160 kick_requests(osdc, 0, was_full);
2161 } else {
2162 dout("ignoring incremental map %u len %d\n",
2163 epoch, maplen);
2164 }
2165 p = next;
2166 nr_maps--;
2167 }
2168 if (newmap)
2169 goto done;
2170
2171 /* full maps */
2172 ceph_decode_32_safe(&p, end, nr_maps, bad);
2173 dout(" %d full maps\n", nr_maps);
2174 while (nr_maps) {
2175 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2176 epoch = ceph_decode_32(&p);
2177 maplen = ceph_decode_32(&p);
2178 ceph_decode_need(&p, end, maplen, bad);
2179 if (nr_maps > 1) {
2180 dout("skipping non-latest full map %u len %d\n",
2181 epoch, maplen);
2182 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2183 dout("skipping full map %u len %d, "
2184 "older than our %u\n", epoch, maplen,
2185 osdc->osdmap->epoch);
2186 } else {
2187 int skipped_map = 0;
2188
2189 dout("taking full map %u len %d\n", epoch, maplen);
2190 newmap = ceph_osdmap_decode(&p, p+maplen);
2191 if (IS_ERR(newmap)) {
2192 err = PTR_ERR(newmap);
2193 goto bad;
2194 }
2195 BUG_ON(!newmap);
2196 oldmap = osdc->osdmap;
2197 osdc->osdmap = newmap;
2198 if (oldmap) {
2199 if (oldmap->epoch + 1 < newmap->epoch)
2200 skipped_map = 1;
2201 ceph_osdmap_destroy(oldmap);
2202 }
2203 was_full = was_full ||
2204 ceph_osdmap_flag(osdc->osdmap,
2205 CEPH_OSDMAP_FULL);
2206 kick_requests(osdc, skipped_map, was_full);
2207 }
2208 p += maplen;
2209 nr_maps--;
2210 }
2211
2212 if (!osdc->osdmap)
2213 goto bad;
2214 done:
2215 downgrade_write(&osdc->map_sem);
2216 ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2217 osdc->osdmap->epoch);
2218
2219 /*
2220 * subscribe to subsequent osdmap updates if full to ensure
2221 * we find out when we are no longer full and stop returning
2222 * ENOSPC.
2223 */
2224 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2225 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2226 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2227 ceph_monc_request_next_osdmap(&osdc->client->monc);
2228
2229 mutex_lock(&osdc->request_mutex);
2230 __send_queued(osdc);
2231 mutex_unlock(&osdc->request_mutex);
2232 up_read(&osdc->map_sem);
2233 wake_up_all(&osdc->client->auth_wq);
2234 return;
2235
2236 bad:
2237 pr_err("osdc handle_map corrupt msg\n");
2238 ceph_msg_dump(msg);
2239 up_write(&osdc->map_sem);
2240 }
2241
2242 /*
2243 * watch/notify callback event infrastructure
2244 *
2245 * These callbacks are used both for watch and notify operations.
2246 */
2247 static void __release_event(struct kref *kref)
2248 {
2249 struct ceph_osd_event *event =
2250 container_of(kref, struct ceph_osd_event, kref);
2251
2252 dout("__release_event %p\n", event);
2253 kfree(event);
2254 }
2255
2256 static void get_event(struct ceph_osd_event *event)
2257 {
2258 kref_get(&event->kref);
2259 }
2260
2261 void ceph_osdc_put_event(struct ceph_osd_event *event)
2262 {
2263 kref_put(&event->kref, __release_event);
2264 }
2265 EXPORT_SYMBOL(ceph_osdc_put_event);
2266
2267 static void __insert_event(struct ceph_osd_client *osdc,
2268 struct ceph_osd_event *new)
2269 {
2270 struct rb_node **p = &osdc->event_tree.rb_node;
2271 struct rb_node *parent = NULL;
2272 struct ceph_osd_event *event = NULL;
2273
2274 while (*p) {
2275 parent = *p;
2276 event = rb_entry(parent, struct ceph_osd_event, node);
2277 if (new->cookie < event->cookie)
2278 p = &(*p)->rb_left;
2279 else if (new->cookie > event->cookie)
2280 p = &(*p)->rb_right;
2281 else
2282 BUG();
2283 }
2284
2285 rb_link_node(&new->node, parent, p);
2286 rb_insert_color(&new->node, &osdc->event_tree);
2287 }
2288
2289 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2290 u64 cookie)
2291 {
2292 struct rb_node **p = &osdc->event_tree.rb_node;
2293 struct rb_node *parent = NULL;
2294 struct ceph_osd_event *event = NULL;
2295
2296 while (*p) {
2297 parent = *p;
2298 event = rb_entry(parent, struct ceph_osd_event, node);
2299 if (cookie < event->cookie)
2300 p = &(*p)->rb_left;
2301 else if (cookie > event->cookie)
2302 p = &(*p)->rb_right;
2303 else
2304 return event;
2305 }
2306 return NULL;
2307 }
2308
2309 static void __remove_event(struct ceph_osd_event *event)
2310 {
2311 struct ceph_osd_client *osdc = event->osdc;
2312
2313 if (!RB_EMPTY_NODE(&event->node)) {
2314 dout("__remove_event removed %p\n", event);
2315 rb_erase(&event->node, &osdc->event_tree);
2316 ceph_osdc_put_event(event);
2317 } else {
2318 dout("__remove_event didn't remove %p\n", event);
2319 }
2320 }
2321
2322 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2323 void (*event_cb)(u64, u64, u8, void *),
2324 void *data, struct ceph_osd_event **pevent)
2325 {
2326 struct ceph_osd_event *event;
2327
2328 event = kmalloc(sizeof(*event), GFP_NOIO);
2329 if (!event)
2330 return -ENOMEM;
2331
2332 dout("create_event %p\n", event);
2333 event->cb = event_cb;
2334 event->one_shot = 0;
2335 event->data = data;
2336 event->osdc = osdc;
2337 INIT_LIST_HEAD(&event->osd_node);
2338 RB_CLEAR_NODE(&event->node);
2339 kref_init(&event->kref); /* one ref for us */
2340 kref_get(&event->kref); /* one ref for the caller */
2341
2342 spin_lock(&osdc->event_lock);
2343 event->cookie = ++osdc->event_count;
2344 __insert_event(osdc, event);
2345 spin_unlock(&osdc->event_lock);
2346
2347 *pevent = event;
2348 return 0;
2349 }
2350 EXPORT_SYMBOL(ceph_osdc_create_event);
2351
2352 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2353 {
2354 struct ceph_osd_client *osdc = event->osdc;
2355
2356 dout("cancel_event %p\n", event);
2357 spin_lock(&osdc->event_lock);
2358 __remove_event(event);
2359 spin_unlock(&osdc->event_lock);
2360 ceph_osdc_put_event(event); /* caller's */
2361 }
2362 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2363
2364
2365 static void do_event_work(struct work_struct *work)
2366 {
2367 struct ceph_osd_event_work *event_work =
2368 container_of(work, struct ceph_osd_event_work, work);
2369 struct ceph_osd_event *event = event_work->event;
2370 u64 ver = event_work->ver;
2371 u64 notify_id = event_work->notify_id;
2372 u8 opcode = event_work->opcode;
2373
2374 dout("do_event_work completing %p\n", event);
2375 event->cb(ver, notify_id, opcode, event->data);
2376 dout("do_event_work completed %p\n", event);
2377 ceph_osdc_put_event(event);
2378 kfree(event_work);
2379 }
2380
2381
2382 /*
2383 * Process osd watch notifications
2384 */
2385 static void handle_watch_notify(struct ceph_osd_client *osdc,
2386 struct ceph_msg *msg)
2387 {
2388 void *p, *end;
2389 u8 proto_ver;
2390 u64 cookie, ver, notify_id;
2391 u8 opcode;
2392 struct ceph_osd_event *event;
2393 struct ceph_osd_event_work *event_work;
2394
2395 p = msg->front.iov_base;
2396 end = p + msg->front.iov_len;
2397
2398 ceph_decode_8_safe(&p, end, proto_ver, bad);
2399 ceph_decode_8_safe(&p, end, opcode, bad);
2400 ceph_decode_64_safe(&p, end, cookie, bad);
2401 ceph_decode_64_safe(&p, end, ver, bad);
2402 ceph_decode_64_safe(&p, end, notify_id, bad);
2403
2404 spin_lock(&osdc->event_lock);
2405 event = __find_event(osdc, cookie);
2406 if (event) {
2407 BUG_ON(event->one_shot);
2408 get_event(event);
2409 }
2410 spin_unlock(&osdc->event_lock);
2411 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2412 cookie, ver, event);
2413 if (event) {
2414 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2415 if (!event_work) {
2416 pr_err("couldn't allocate event_work\n");
2417 ceph_osdc_put_event(event);
2418 return;
2419 }
2420 INIT_WORK(&event_work->work, do_event_work);
2421 event_work->event = event;
2422 event_work->ver = ver;
2423 event_work->notify_id = notify_id;
2424 event_work->opcode = opcode;
2425
2426 queue_work(osdc->notify_wq, &event_work->work);
2427 }
2428
2429 return;
2430
2431 bad:
2432 pr_err("osdc handle_watch_notify corrupt msg\n");
2433 }
2434
2435 /*
2436 * build new request AND message
2437 *
2438 */
2439 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2440 struct ceph_snap_context *snapc, u64 snap_id,
2441 struct timespec *mtime)
2442 {
2443 struct ceph_msg *msg = req->r_request;
2444 void *p;
2445 size_t msg_size;
2446 int flags = req->r_flags;
2447 u64 data_len;
2448 unsigned int i;
2449
2450 req->r_snapid = snap_id;
2451 WARN_ON(snapc != req->r_snapc);
2452
2453 /* encode request */
2454 msg->hdr.version = cpu_to_le16(4);
2455
2456 p = msg->front.iov_base;
2457 ceph_encode_32(&p, 1); /* client_inc is always 1 */
2458 req->r_request_osdmap_epoch = p;
2459 p += 4;
2460 req->r_request_flags = p;
2461 p += 4;
2462 if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2463 ceph_encode_timespec(p, mtime);
2464 p += sizeof(struct ceph_timespec);
2465 req->r_request_reassert_version = p;
2466 p += sizeof(struct ceph_eversion); /* will get filled in */
2467
2468 /* oloc */
2469 ceph_encode_8(&p, 4);
2470 ceph_encode_8(&p, 4);
2471 ceph_encode_32(&p, 8 + 4 + 4);
2472 req->r_request_pool = p;
2473 p += 8;
2474 ceph_encode_32(&p, -1); /* preferred */
2475 ceph_encode_32(&p, 0); /* key len */
2476
2477 ceph_encode_8(&p, 1);
2478 req->r_request_pgid = p;
2479 p += 8 + 4;
2480 ceph_encode_32(&p, -1); /* preferred */
2481
2482 /* oid */
2483 ceph_encode_32(&p, req->r_base_oid.name_len);
2484 memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2485 dout("oid %*pE len %d\n", req->r_base_oid.name_len,
2486 req->r_base_oid.name, req->r_base_oid.name_len);
2487 p += req->r_base_oid.name_len;
2488
2489 /* ops--can imply data */
2490 ceph_encode_16(&p, (u16)req->r_num_ops);
2491 data_len = 0;
2492 for (i = 0; i < req->r_num_ops; i++) {
2493 data_len += osd_req_encode_op(req, p, i);
2494 p += sizeof(struct ceph_osd_op);
2495 }
2496
2497 /* snaps */
2498 ceph_encode_64(&p, req->r_snapid);
2499 ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2500 ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2501 if (req->r_snapc) {
2502 for (i = 0; i < req->r_snapc->num_snaps; i++) {
2503 ceph_encode_64(&p, req->r_snapc->snaps[i]);
2504 }
2505 }
2506
2507 req->r_request_attempts = p;
2508 p += 4;
2509
2510 /* data */
2511 if (flags & CEPH_OSD_FLAG_WRITE) {
2512 u16 data_off;
2513
2514 /*
2515 * The header "data_off" is a hint to the receiver
2516 * allowing it to align received data into its
2517 * buffers such that there's no need to re-copy
2518 * it before writing it to disk (direct I/O).
2519 */
2520 data_off = (u16) (off & 0xffff);
2521 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2522 }
2523 req->r_request->hdr.data_len = cpu_to_le32(data_len);
2524
2525 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2526 msg_size = p - msg->front.iov_base;
2527 msg->front.iov_len = msg_size;
2528 msg->hdr.front_len = cpu_to_le32(msg_size);
2529
2530 dout("build_request msg_size was %d\n", (int)msg_size);
2531 }
2532 EXPORT_SYMBOL(ceph_osdc_build_request);
2533
2534 /*
2535 * Register request, send initial attempt.
2536 */
2537 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2538 struct ceph_osd_request *req,
2539 bool nofail)
2540 {
2541 int rc;
2542
2543 down_read(&osdc->map_sem);
2544 mutex_lock(&osdc->request_mutex);
2545
2546 rc = __ceph_osdc_start_request(osdc, req, nofail);
2547
2548 mutex_unlock(&osdc->request_mutex);
2549 up_read(&osdc->map_sem);
2550
2551 return rc;
2552 }
2553 EXPORT_SYMBOL(ceph_osdc_start_request);
2554
2555 /*
2556 * Unregister a registered request. The request is not completed (i.e.
2557 * no callbacks or wakeups) - higher layers are supposed to know what
2558 * they are canceling.
2559 */
2560 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2561 {
2562 struct ceph_osd_client *osdc = req->r_osdc;
2563
2564 mutex_lock(&osdc->request_mutex);
2565 if (req->r_linger)
2566 __unregister_linger_request(osdc, req);
2567 __unregister_request(osdc, req);
2568 mutex_unlock(&osdc->request_mutex);
2569
2570 dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2571 }
2572 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2573
2574 /*
2575 * wait for a request to complete
2576 */
2577 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2578 struct ceph_osd_request *req)
2579 {
2580 int rc;
2581
2582 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2583
2584 rc = wait_for_completion_interruptible(&req->r_completion);
2585 if (rc < 0) {
2586 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2587 ceph_osdc_cancel_request(req);
2588 complete_request(req);
2589 return rc;
2590 }
2591
2592 dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2593 req->r_result);
2594 return req->r_result;
2595 }
2596 EXPORT_SYMBOL(ceph_osdc_wait_request);
2597
2598 /*
2599 * sync - wait for all in-flight requests to flush. avoid starvation.
2600 */
2601 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2602 {
2603 struct ceph_osd_request *req;
2604 u64 last_tid, next_tid = 0;
2605
2606 mutex_lock(&osdc->request_mutex);
2607 last_tid = osdc->last_tid;
2608 while (1) {
2609 req = __lookup_request_ge(osdc, next_tid);
2610 if (!req)
2611 break;
2612 if (req->r_tid > last_tid)
2613 break;
2614
2615 next_tid = req->r_tid + 1;
2616 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2617 continue;
2618
2619 ceph_osdc_get_request(req);
2620 mutex_unlock(&osdc->request_mutex);
2621 dout("sync waiting on tid %llu (last is %llu)\n",
2622 req->r_tid, last_tid);
2623 wait_for_completion(&req->r_safe_completion);
2624 mutex_lock(&osdc->request_mutex);
2625 ceph_osdc_put_request(req);
2626 }
2627 mutex_unlock(&osdc->request_mutex);
2628 dout("sync done (thru tid %llu)\n", last_tid);
2629 }
2630 EXPORT_SYMBOL(ceph_osdc_sync);
2631
2632 /*
2633 * Call all pending notify callbacks - for use after a watch is
2634 * unregistered, to make sure no more callbacks for it will be invoked
2635 */
2636 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2637 {
2638 flush_workqueue(osdc->notify_wq);
2639 }
2640 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2641
2642
2643 /*
2644 * init, shutdown
2645 */
2646 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2647 {
2648 int err;
2649
2650 dout("init\n");
2651 osdc->client = client;
2652 osdc->osdmap = NULL;
2653 init_rwsem(&osdc->map_sem);
2654 mutex_init(&osdc->request_mutex);
2655 osdc->last_tid = 0;
2656 osdc->osds = RB_ROOT;
2657 INIT_LIST_HEAD(&osdc->osd_lru);
2658 osdc->requests = RB_ROOT;
2659 INIT_LIST_HEAD(&osdc->req_lru);
2660 INIT_LIST_HEAD(&osdc->req_unsent);
2661 INIT_LIST_HEAD(&osdc->req_notarget);
2662 INIT_LIST_HEAD(&osdc->req_linger);
2663 osdc->num_requests = 0;
2664 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2665 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2666 spin_lock_init(&osdc->event_lock);
2667 osdc->event_tree = RB_ROOT;
2668 osdc->event_count = 0;
2669
2670 schedule_delayed_work(&osdc->osds_timeout_work,
2671 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
2672
2673 err = -ENOMEM;
2674 osdc->req_mempool = mempool_create_slab_pool(10,
2675 ceph_osd_request_cache);
2676 if (!osdc->req_mempool)
2677 goto out;
2678
2679 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2680 PAGE_SIZE, 10, true, "osd_op");
2681 if (err < 0)
2682 goto out_mempool;
2683 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2684 PAGE_SIZE, 10, true, "osd_op_reply");
2685 if (err < 0)
2686 goto out_msgpool;
2687
2688 err = -ENOMEM;
2689 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2690 if (!osdc->notify_wq)
2691 goto out_msgpool_reply;
2692
2693 return 0;
2694
2695 out_msgpool_reply:
2696 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2697 out_msgpool:
2698 ceph_msgpool_destroy(&osdc->msgpool_op);
2699 out_mempool:
2700 mempool_destroy(osdc->req_mempool);
2701 out:
2702 return err;
2703 }
2704
2705 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2706 {
2707 flush_workqueue(osdc->notify_wq);
2708 destroy_workqueue(osdc->notify_wq);
2709 cancel_delayed_work_sync(&osdc->timeout_work);
2710 cancel_delayed_work_sync(&osdc->osds_timeout_work);
2711
2712 mutex_lock(&osdc->request_mutex);
2713 while (!RB_EMPTY_ROOT(&osdc->osds)) {
2714 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
2715 struct ceph_osd, o_node);
2716 remove_osd(osdc, osd);
2717 }
2718 mutex_unlock(&osdc->request_mutex);
2719
2720 if (osdc->osdmap) {
2721 ceph_osdmap_destroy(osdc->osdmap);
2722 osdc->osdmap = NULL;
2723 }
2724 mempool_destroy(osdc->req_mempool);
2725 ceph_msgpool_destroy(&osdc->msgpool_op);
2726 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2727 }
2728
2729 /*
2730 * Read some contiguous pages. If we cross a stripe boundary, shorten
2731 * *plen. Return number of bytes read, or error.
2732 */
2733 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2734 struct ceph_vino vino, struct ceph_file_layout *layout,
2735 u64 off, u64 *plen,
2736 u32 truncate_seq, u64 truncate_size,
2737 struct page **pages, int num_pages, int page_align)
2738 {
2739 struct ceph_osd_request *req;
2740 int rc = 0;
2741
2742 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2743 vino.snap, off, *plen);
2744 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2745 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2746 NULL, truncate_seq, truncate_size,
2747 false);
2748 if (IS_ERR(req))
2749 return PTR_ERR(req);
2750
2751 /* it may be a short read due to an object boundary */
2752
2753 osd_req_op_extent_osd_data_pages(req, 0,
2754 pages, *plen, page_align, false, false);
2755
2756 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
2757 off, *plen, *plen, page_align);
2758
2759 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2760
2761 rc = ceph_osdc_start_request(osdc, req, false);
2762 if (!rc)
2763 rc = ceph_osdc_wait_request(osdc, req);
2764
2765 ceph_osdc_put_request(req);
2766 dout("readpages result %d\n", rc);
2767 return rc;
2768 }
2769 EXPORT_SYMBOL(ceph_osdc_readpages);
2770
2771 /*
2772 * do a synchronous write on N pages
2773 */
2774 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2775 struct ceph_file_layout *layout,
2776 struct ceph_snap_context *snapc,
2777 u64 off, u64 len,
2778 u32 truncate_seq, u64 truncate_size,
2779 struct timespec *mtime,
2780 struct page **pages, int num_pages)
2781 {
2782 struct ceph_osd_request *req;
2783 int rc = 0;
2784 int page_align = off & ~PAGE_MASK;
2785
2786 BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */
2787 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2788 CEPH_OSD_OP_WRITE,
2789 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2790 snapc, truncate_seq, truncate_size,
2791 true);
2792 if (IS_ERR(req))
2793 return PTR_ERR(req);
2794
2795 /* it may be a short write due to an object boundary */
2796 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2797 false, false);
2798 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2799
2800 ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2801
2802 rc = ceph_osdc_start_request(osdc, req, true);
2803 if (!rc)
2804 rc = ceph_osdc_wait_request(osdc, req);
2805
2806 ceph_osdc_put_request(req);
2807 if (rc == 0)
2808 rc = len;
2809 dout("writepages result %d\n", rc);
2810 return rc;
2811 }
2812 EXPORT_SYMBOL(ceph_osdc_writepages);
2813
2814 int ceph_osdc_setup(void)
2815 {
2816 size_t size = sizeof(struct ceph_osd_request) +
2817 CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
2818
2819 BUG_ON(ceph_osd_request_cache);
2820 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
2821 0, 0, NULL);
2822
2823 return ceph_osd_request_cache ? 0 : -ENOMEM;
2824 }
2825 EXPORT_SYMBOL(ceph_osdc_setup);
2826
2827 void ceph_osdc_cleanup(void)
2828 {
2829 BUG_ON(!ceph_osd_request_cache);
2830 kmem_cache_destroy(ceph_osd_request_cache);
2831 ceph_osd_request_cache = NULL;
2832 }
2833 EXPORT_SYMBOL(ceph_osdc_cleanup);
2834
2835 /*
2836 * handle incoming message
2837 */
2838 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2839 {
2840 struct ceph_osd *osd = con->private;
2841 struct ceph_osd_client *osdc;
2842 int type = le16_to_cpu(msg->hdr.type);
2843
2844 if (!osd)
2845 goto out;
2846 osdc = osd->o_osdc;
2847
2848 switch (type) {
2849 case CEPH_MSG_OSD_MAP:
2850 ceph_osdc_handle_map(osdc, msg);
2851 break;
2852 case CEPH_MSG_OSD_OPREPLY:
2853 handle_reply(osdc, msg);
2854 break;
2855 case CEPH_MSG_WATCH_NOTIFY:
2856 handle_watch_notify(osdc, msg);
2857 break;
2858
2859 default:
2860 pr_err("received unknown message type %d %s\n", type,
2861 ceph_msg_type_name(type));
2862 }
2863 out:
2864 ceph_msg_put(msg);
2865 }
2866
2867 /*
2868 * Lookup and return message for incoming reply. Don't try to do
2869 * anything about a larger than preallocated data portion of the
2870 * message at the moment - for now, just skip the message.
2871 */
2872 static struct ceph_msg *get_reply(struct ceph_connection *con,
2873 struct ceph_msg_header *hdr,
2874 int *skip)
2875 {
2876 struct ceph_osd *osd = con->private;
2877 struct ceph_osd_client *osdc = osd->o_osdc;
2878 struct ceph_msg *m;
2879 struct ceph_osd_request *req;
2880 int front_len = le32_to_cpu(hdr->front_len);
2881 int data_len = le32_to_cpu(hdr->data_len);
2882 u64 tid;
2883
2884 tid = le64_to_cpu(hdr->tid);
2885 mutex_lock(&osdc->request_mutex);
2886 req = lookup_request(&osdc->requests, tid);
2887 if (!req) {
2888 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
2889 osd->o_osd, tid);
2890 m = NULL;
2891 *skip = 1;
2892 goto out;
2893 }
2894
2895 ceph_msg_revoke_incoming(req->r_reply);
2896
2897 if (front_len > req->r_reply->front_alloc_len) {
2898 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
2899 __func__, osd->o_osd, req->r_tid, front_len,
2900 req->r_reply->front_alloc_len);
2901 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2902 false);
2903 if (!m)
2904 goto out;
2905 ceph_msg_put(req->r_reply);
2906 req->r_reply = m;
2907 }
2908
2909 if (data_len > req->r_reply->data_length) {
2910 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
2911 __func__, osd->o_osd, req->r_tid, data_len,
2912 req->r_reply->data_length);
2913 m = NULL;
2914 *skip = 1;
2915 goto out;
2916 }
2917
2918 m = ceph_msg_get(req->r_reply);
2919 dout("get_reply tid %lld %p\n", tid, m);
2920
2921 out:
2922 mutex_unlock(&osdc->request_mutex);
2923 return m;
2924 }
2925
2926 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2927 struct ceph_msg_header *hdr,
2928 int *skip)
2929 {
2930 struct ceph_osd *osd = con->private;
2931 int type = le16_to_cpu(hdr->type);
2932 int front = le32_to_cpu(hdr->front_len);
2933
2934 *skip = 0;
2935 switch (type) {
2936 case CEPH_MSG_OSD_MAP:
2937 case CEPH_MSG_WATCH_NOTIFY:
2938 return ceph_msg_new(type, front, GFP_NOFS, false);
2939 case CEPH_MSG_OSD_OPREPLY:
2940 return get_reply(con, hdr, skip);
2941 default:
2942 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2943 osd->o_osd);
2944 *skip = 1;
2945 return NULL;
2946 }
2947 }
2948
2949 /*
2950 * Wrappers to refcount containing ceph_osd struct
2951 */
2952 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2953 {
2954 struct ceph_osd *osd = con->private;
2955 if (get_osd(osd))
2956 return con;
2957 return NULL;
2958 }
2959
2960 static void put_osd_con(struct ceph_connection *con)
2961 {
2962 struct ceph_osd *osd = con->private;
2963 put_osd(osd);
2964 }
2965
2966 /*
2967 * authentication
2968 */
2969 /*
2970 * Note: returned pointer is the address of a structure that's
2971 * managed separately. Caller must *not* attempt to free it.
2972 */
2973 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2974 int *proto, int force_new)
2975 {
2976 struct ceph_osd *o = con->private;
2977 struct ceph_osd_client *osdc = o->o_osdc;
2978 struct ceph_auth_client *ac = osdc->client->monc.auth;
2979 struct ceph_auth_handshake *auth = &o->o_auth;
2980
2981 if (force_new && auth->authorizer) {
2982 ceph_auth_destroy_authorizer(auth->authorizer);
2983 auth->authorizer = NULL;
2984 }
2985 if (!auth->authorizer) {
2986 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2987 auth);
2988 if (ret)
2989 return ERR_PTR(ret);
2990 } else {
2991 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2992 auth);
2993 if (ret)
2994 return ERR_PTR(ret);
2995 }
2996 *proto = ac->protocol;
2997
2998 return auth;
2999 }
3000
3001
3002 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3003 {
3004 struct ceph_osd *o = con->private;
3005 struct ceph_osd_client *osdc = o->o_osdc;
3006 struct ceph_auth_client *ac = osdc->client->monc.auth;
3007
3008 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
3009 }
3010
3011 static int invalidate_authorizer(struct ceph_connection *con)
3012 {
3013 struct ceph_osd *o = con->private;
3014 struct ceph_osd_client *osdc = o->o_osdc;
3015 struct ceph_auth_client *ac = osdc->client->monc.auth;
3016
3017 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
3018 return ceph_monc_validate_auth(&osdc->client->monc);
3019 }
3020
3021 static int osd_sign_message(struct ceph_msg *msg)
3022 {
3023 struct ceph_osd *o = msg->con->private;
3024 struct ceph_auth_handshake *auth = &o->o_auth;
3025
3026 return ceph_auth_sign_message(auth, msg);
3027 }
3028
3029 static int osd_check_message_signature(struct ceph_msg *msg)
3030 {
3031 struct ceph_osd *o = msg->con->private;
3032 struct ceph_auth_handshake *auth = &o->o_auth;
3033
3034 return ceph_auth_check_message_signature(auth, msg);
3035 }
3036
3037 static const struct ceph_connection_operations osd_con_ops = {
3038 .get = get_osd_con,
3039 .put = put_osd_con,
3040 .dispatch = dispatch,
3041 .get_authorizer = get_authorizer,
3042 .verify_authorizer_reply = verify_authorizer_reply,
3043 .invalidate_authorizer = invalidate_authorizer,
3044 .alloc_msg = alloc_msg,
3045 .sign_message = osd_sign_message,
3046 .check_message_signature = osd_check_message_signature,
3047 .fault = osd_reset,
3048 };
Linux kernel - Deliverables
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