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Linux 4.8.3
[linux/fpc-iii.git] / net / ceph / osd_client.c
bloba97e7b506612b4255f4b99de76d74c46a1b3896d
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 /*
29 * Implement client access to distributed object storage cluster.
30 *
31 * All data objects are stored within a cluster/cloud of OSDs, or
32 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
33 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
34 * remote daemons serving up and coordinating consistent and safe
35 * access to storage.
36 *
37 * Cluster membership and the mapping of data objects onto storage devices
38 * are described by the osd map.
39 *
40 * We keep track of pending OSD requests (read, write), resubmit
41 * requests to different OSDs when the cluster topology/data layout
42 * change, or retry the affected requests when the communications
43 * channel with an OSD is reset.
44 */
45
46 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
47 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
48 static void link_linger(struct ceph_osd *osd,
49 struct ceph_osd_linger_request *lreq);
50 static void unlink_linger(struct ceph_osd *osd,
51 struct ceph_osd_linger_request *lreq);
52
53 #if 1
54 static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
55 {
56 bool wrlocked = true;
57
58 if (unlikely(down_read_trylock(sem))) {
59 wrlocked = false;
60 up_read(sem);
61 }
62
63 return wrlocked;
64 }
65 static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
66 {
67 WARN_ON(!rwsem_is_locked(&osdc->lock));
68 }
69 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
70 {
71 WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
72 }
73 static inline void verify_osd_locked(struct ceph_osd *osd)
74 {
75 struct ceph_osd_client *osdc = osd->o_osdc;
76
77 WARN_ON(!(mutex_is_locked(&osd->lock) &&
78 rwsem_is_locked(&osdc->lock)) &&
79 !rwsem_is_wrlocked(&osdc->lock));
80 }
81 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
82 {
83 WARN_ON(!mutex_is_locked(&lreq->lock));
84 }
85 #else
86 static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
87 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
88 static inline void verify_osd_locked(struct ceph_osd *osd) { }
89 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
90 #endif
91
92 /*
93 * calculate the mapping of a file extent onto an object, and fill out the
94 * request accordingly. shorten extent as necessary if it crosses an
95 * object boundary.
96 *
97 * fill osd op in request message.
98 */
99 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
100 u64 *objnum, u64 *objoff, u64 *objlen)
101 {
102 u64 orig_len = *plen;
103 int r;
104
105 /* object extent? */
106 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
107 objoff, objlen);
108 if (r < 0)
109 return r;
110 if (*objlen < orig_len) {
111 *plen = *objlen;
112 dout(" skipping last %llu, final file extent %llu~%llu\n",
113 orig_len - *plen, off, *plen);
114 }
115
116 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
117
118 return 0;
119 }
120
121 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
122 {
123 memset(osd_data, 0, sizeof (*osd_data));
124 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
125 }
126
127 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
128 struct page **pages, u64 length, u32 alignment,
129 bool pages_from_pool, bool own_pages)
130 {
131 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
132 osd_data->pages = pages;
133 osd_data->length = length;
134 osd_data->alignment = alignment;
135 osd_data->pages_from_pool = pages_from_pool;
136 osd_data->own_pages = own_pages;
137 }
138
139 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
140 struct ceph_pagelist *pagelist)
141 {
142 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
143 osd_data->pagelist = pagelist;
144 }
145
146 #ifdef CONFIG_BLOCK
147 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
148 struct bio *bio, size_t bio_length)
149 {
150 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
151 osd_data->bio = bio;
152 osd_data->bio_length = bio_length;
153 }
154 #endif /* CONFIG_BLOCK */
155
156 #define osd_req_op_data(oreq, whch, typ, fld) \
157 ({ \
158 struct ceph_osd_request *__oreq = (oreq); \
159 unsigned int __whch = (whch); \
160 BUG_ON(__whch >= __oreq->r_num_ops); \
161 &__oreq->r_ops[__whch].typ.fld; \
162 })
163
164 static struct ceph_osd_data *
165 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
166 {
167 BUG_ON(which >= osd_req->r_num_ops);
168
169 return &osd_req->r_ops[which].raw_data_in;
170 }
171
172 struct ceph_osd_data *
173 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
174 unsigned int which)
175 {
176 return osd_req_op_data(osd_req, which, extent, osd_data);
177 }
178 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
179
180 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
181 unsigned int which, struct page **pages,
182 u64 length, u32 alignment,
183 bool pages_from_pool, bool own_pages)
184 {
185 struct ceph_osd_data *osd_data;
186
187 osd_data = osd_req_op_raw_data_in(osd_req, which);
188 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
189 pages_from_pool, own_pages);
190 }
191 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
192
193 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
194 unsigned int which, struct page **pages,
195 u64 length, u32 alignment,
196 bool pages_from_pool, bool own_pages)
197 {
198 struct ceph_osd_data *osd_data;
199
200 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
201 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
202 pages_from_pool, own_pages);
203 }
204 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
205
206 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
207 unsigned int which, struct ceph_pagelist *pagelist)
208 {
209 struct ceph_osd_data *osd_data;
210
211 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
212 ceph_osd_data_pagelist_init(osd_data, pagelist);
213 }
214 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
215
216 #ifdef CONFIG_BLOCK
217 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
218 unsigned int which, struct bio *bio, size_t bio_length)
219 {
220 struct ceph_osd_data *osd_data;
221
222 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
223 ceph_osd_data_bio_init(osd_data, bio, bio_length);
224 }
225 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
226 #endif /* CONFIG_BLOCK */
227
228 static void osd_req_op_cls_request_info_pagelist(
229 struct ceph_osd_request *osd_req,
230 unsigned int which, struct ceph_pagelist *pagelist)
231 {
232 struct ceph_osd_data *osd_data;
233
234 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
235 ceph_osd_data_pagelist_init(osd_data, pagelist);
236 }
237
238 void osd_req_op_cls_request_data_pagelist(
239 struct ceph_osd_request *osd_req,
240 unsigned int which, struct ceph_pagelist *pagelist)
241 {
242 struct ceph_osd_data *osd_data;
243
244 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
245 ceph_osd_data_pagelist_init(osd_data, pagelist);
246 osd_req->r_ops[which].cls.indata_len += pagelist->length;
247 osd_req->r_ops[which].indata_len += pagelist->length;
248 }
249 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
250
251 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
252 unsigned int which, struct page **pages, u64 length,
253 u32 alignment, bool pages_from_pool, bool own_pages)
254 {
255 struct ceph_osd_data *osd_data;
256
257 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
258 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
259 pages_from_pool, own_pages);
260 osd_req->r_ops[which].cls.indata_len += length;
261 osd_req->r_ops[which].indata_len += length;
262 }
263 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
264
265 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
266 unsigned int which, struct page **pages, u64 length,
267 u32 alignment, bool pages_from_pool, bool own_pages)
268 {
269 struct ceph_osd_data *osd_data;
270
271 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
272 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
273 pages_from_pool, own_pages);
274 }
275 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
276
277 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
278 {
279 switch (osd_data->type) {
280 case CEPH_OSD_DATA_TYPE_NONE:
281 return 0;
282 case CEPH_OSD_DATA_TYPE_PAGES:
283 return osd_data->length;
284 case CEPH_OSD_DATA_TYPE_PAGELIST:
285 return (u64)osd_data->pagelist->length;
286 #ifdef CONFIG_BLOCK
287 case CEPH_OSD_DATA_TYPE_BIO:
288 return (u64)osd_data->bio_length;
289 #endif /* CONFIG_BLOCK */
290 default:
291 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
292 return 0;
293 }
294 }
295
296 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
297 {
298 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
299 int num_pages;
300
301 num_pages = calc_pages_for((u64)osd_data->alignment,
302 (u64)osd_data->length);
303 ceph_release_page_vector(osd_data->pages, num_pages);
304 }
305 ceph_osd_data_init(osd_data);
306 }
307
308 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
309 unsigned int which)
310 {
311 struct ceph_osd_req_op *op;
312
313 BUG_ON(which >= osd_req->r_num_ops);
314 op = &osd_req->r_ops[which];
315
316 switch (op->op) {
317 case CEPH_OSD_OP_READ:
318 case CEPH_OSD_OP_WRITE:
319 case CEPH_OSD_OP_WRITEFULL:
320 ceph_osd_data_release(&op->extent.osd_data);
321 break;
322 case CEPH_OSD_OP_CALL:
323 ceph_osd_data_release(&op->cls.request_info);
324 ceph_osd_data_release(&op->cls.request_data);
325 ceph_osd_data_release(&op->cls.response_data);
326 break;
327 case CEPH_OSD_OP_SETXATTR:
328 case CEPH_OSD_OP_CMPXATTR:
329 ceph_osd_data_release(&op->xattr.osd_data);
330 break;
331 case CEPH_OSD_OP_STAT:
332 ceph_osd_data_release(&op->raw_data_in);
333 break;
334 case CEPH_OSD_OP_NOTIFY_ACK:
335 ceph_osd_data_release(&op->notify_ack.request_data);
336 break;
337 case CEPH_OSD_OP_NOTIFY:
338 ceph_osd_data_release(&op->notify.request_data);
339 ceph_osd_data_release(&op->notify.response_data);
340 break;
341 default:
342 break;
343 }
344 }
345
346 /*
347 * Assumes @t is zero-initialized.
348 */
349 static void target_init(struct ceph_osd_request_target *t)
350 {
351 ceph_oid_init(&t->base_oid);
352 ceph_oloc_init(&t->base_oloc);
353 ceph_oid_init(&t->target_oid);
354 ceph_oloc_init(&t->target_oloc);
355
356 ceph_osds_init(&t->acting);
357 ceph_osds_init(&t->up);
358 t->size = -1;
359 t->min_size = -1;
360
361 t->osd = CEPH_HOMELESS_OSD;
362 }
363
364 static void target_copy(struct ceph_osd_request_target *dest,
365 const struct ceph_osd_request_target *src)
366 {
367 ceph_oid_copy(&dest->base_oid, &src->base_oid);
368 ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
369 ceph_oid_copy(&dest->target_oid, &src->target_oid);
370 ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);
371
372 dest->pgid = src->pgid; /* struct */
373 dest->pg_num = src->pg_num;
374 dest->pg_num_mask = src->pg_num_mask;
375 ceph_osds_copy(&dest->acting, &src->acting);
376 ceph_osds_copy(&dest->up, &src->up);
377 dest->size = src->size;
378 dest->min_size = src->min_size;
379 dest->sort_bitwise = src->sort_bitwise;
380
381 dest->flags = src->flags;
382 dest->paused = src->paused;
383
384 dest->osd = src->osd;
385 }
386
387 static void target_destroy(struct ceph_osd_request_target *t)
388 {
389 ceph_oid_destroy(&t->base_oid);
390 ceph_oloc_destroy(&t->base_oloc);
391 ceph_oid_destroy(&t->target_oid);
392 ceph_oloc_destroy(&t->target_oloc);
393 }
394
395 /*
396 * requests
397 */
398 static void request_release_checks(struct ceph_osd_request *req)
399 {
400 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
401 WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
402 WARN_ON(!list_empty(&req->r_unsafe_item));
403 WARN_ON(req->r_osd);
404 }
405
406 static void ceph_osdc_release_request(struct kref *kref)
407 {
408 struct ceph_osd_request *req = container_of(kref,
409 struct ceph_osd_request, r_kref);
410 unsigned int which;
411
412 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
413 req->r_request, req->r_reply);
414 request_release_checks(req);
415
416 if (req->r_request)
417 ceph_msg_put(req->r_request);
418 if (req->r_reply)
419 ceph_msg_put(req->r_reply);
420
421 for (which = 0; which < req->r_num_ops; which++)
422 osd_req_op_data_release(req, which);
423
424 target_destroy(&req->r_t);
425 ceph_put_snap_context(req->r_snapc);
426
427 if (req->r_mempool)
428 mempool_free(req, req->r_osdc->req_mempool);
429 else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
430 kmem_cache_free(ceph_osd_request_cache, req);
431 else
432 kfree(req);
433 }
434
435 void ceph_osdc_get_request(struct ceph_osd_request *req)
436 {
437 dout("%s %p (was %d)\n", __func__, req,
438 atomic_read(&req->r_kref.refcount));
439 kref_get(&req->r_kref);
440 }
441 EXPORT_SYMBOL(ceph_osdc_get_request);
442
443 void ceph_osdc_put_request(struct ceph_osd_request *req)
444 {
445 if (req) {
446 dout("%s %p (was %d)\n", __func__, req,
447 atomic_read(&req->r_kref.refcount));
448 kref_put(&req->r_kref, ceph_osdc_release_request);
449 }
450 }
451 EXPORT_SYMBOL(ceph_osdc_put_request);
452
453 static void request_init(struct ceph_osd_request *req)
454 {
455 /* req only, each op is zeroed in _osd_req_op_init() */
456 memset(req, 0, sizeof(*req));
457
458 kref_init(&req->r_kref);
459 init_completion(&req->r_completion);
460 init_completion(&req->r_safe_completion);
461 RB_CLEAR_NODE(&req->r_node);
462 RB_CLEAR_NODE(&req->r_mc_node);
463 INIT_LIST_HEAD(&req->r_unsafe_item);
464
465 target_init(&req->r_t);
466 }
467
468 /*
469 * This is ugly, but it allows us to reuse linger registration and ping
470 * requests, keeping the structure of the code around send_linger{_ping}()
471 * reasonable. Setting up a min_nr=2 mempool for each linger request
472 * and dealing with copying ops (this blasts req only, watch op remains
473 * intact) isn't any better.
474 */
475 static void request_reinit(struct ceph_osd_request *req)
476 {
477 struct ceph_osd_client *osdc = req->r_osdc;
478 bool mempool = req->r_mempool;
479 unsigned int num_ops = req->r_num_ops;
480 u64 snapid = req->r_snapid;
481 struct ceph_snap_context *snapc = req->r_snapc;
482 bool linger = req->r_linger;
483 struct ceph_msg *request_msg = req->r_request;
484 struct ceph_msg *reply_msg = req->r_reply;
485
486 dout("%s req %p\n", __func__, req);
487 WARN_ON(atomic_read(&req->r_kref.refcount) != 1);
488 request_release_checks(req);
489
490 WARN_ON(atomic_read(&request_msg->kref.refcount) != 1);
491 WARN_ON(atomic_read(&reply_msg->kref.refcount) != 1);
492 target_destroy(&req->r_t);
493
494 request_init(req);
495 req->r_osdc = osdc;
496 req->r_mempool = mempool;
497 req->r_num_ops = num_ops;
498 req->r_snapid = snapid;
499 req->r_snapc = snapc;
500 req->r_linger = linger;
501 req->r_request = request_msg;
502 req->r_reply = reply_msg;
503 }
504
505 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
506 struct ceph_snap_context *snapc,
507 unsigned int num_ops,
508 bool use_mempool,
509 gfp_t gfp_flags)
510 {
511 struct ceph_osd_request *req;
512
513 if (use_mempool) {
514 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
515 req = mempool_alloc(osdc->req_mempool, gfp_flags);
516 } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
517 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
518 } else {
519 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
520 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
521 gfp_flags);
522 }
523 if (unlikely(!req))
524 return NULL;
525
526 request_init(req);
527 req->r_osdc = osdc;
528 req->r_mempool = use_mempool;
529 req->r_num_ops = num_ops;
530 req->r_snapid = CEPH_NOSNAP;
531 req->r_snapc = ceph_get_snap_context(snapc);
532
533 dout("%s req %p\n", __func__, req);
534 return req;
535 }
536 EXPORT_SYMBOL(ceph_osdc_alloc_request);
537
538 static int ceph_oloc_encoding_size(struct ceph_object_locator *oloc)
539 {
540 return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
541 }
542
543 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
544 {
545 struct ceph_osd_client *osdc = req->r_osdc;
546 struct ceph_msg *msg;
547 int msg_size;
548
549 WARN_ON(ceph_oid_empty(&req->r_base_oid));
550 WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
551
552 /* create request message */
553 msg_size = 4 + 4 + 4; /* client_inc, osdmap_epoch, flags */
554 msg_size += 4 + 4 + 4 + 8; /* mtime, reassert_version */
555 msg_size += CEPH_ENCODING_START_BLK_LEN +
556 ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
557 msg_size += 1 + 8 + 4 + 4; /* pgid */
558 msg_size += 4 + req->r_base_oid.name_len; /* oid */
559 msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
560 msg_size += 8; /* snapid */
561 msg_size += 8; /* snap_seq */
562 msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
563 msg_size += 4; /* retry_attempt */
564
565 if (req->r_mempool)
566 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
567 else
568 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
569 if (!msg)
570 return -ENOMEM;
571
572 memset(msg->front.iov_base, 0, msg->front.iov_len);
573 req->r_request = msg;
574
575 /* create reply message */
576 msg_size = OSD_OPREPLY_FRONT_LEN;
577 msg_size += req->r_base_oid.name_len;
578 msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
579
580 if (req->r_mempool)
581 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
582 else
583 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
584 if (!msg)
585 return -ENOMEM;
586
587 req->r_reply = msg;
588
589 return 0;
590 }
591 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
592
593 static bool osd_req_opcode_valid(u16 opcode)
594 {
595 switch (opcode) {
596 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
597 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
598 #undef GENERATE_CASE
599 default:
600 return false;
601 }
602 }
603
604 /*
605 * This is an osd op init function for opcodes that have no data or
606 * other information associated with them. It also serves as a
607 * common init routine for all the other init functions, below.
608 */
609 static struct ceph_osd_req_op *
610 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
611 u16 opcode, u32 flags)
612 {
613 struct ceph_osd_req_op *op;
614
615 BUG_ON(which >= osd_req->r_num_ops);
616 BUG_ON(!osd_req_opcode_valid(opcode));
617
618 op = &osd_req->r_ops[which];
619 memset(op, 0, sizeof (*op));
620 op->op = opcode;
621 op->flags = flags;
622
623 return op;
624 }
625
626 void osd_req_op_init(struct ceph_osd_request *osd_req,
627 unsigned int which, u16 opcode, u32 flags)
628 {
629 (void)_osd_req_op_init(osd_req, which, opcode, flags);
630 }
631 EXPORT_SYMBOL(osd_req_op_init);
632
633 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
634 unsigned int which, u16 opcode,
635 u64 offset, u64 length,
636 u64 truncate_size, u32 truncate_seq)
637 {
638 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
639 opcode, 0);
640 size_t payload_len = 0;
641
642 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
643 opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
644 opcode != CEPH_OSD_OP_TRUNCATE);
645
646 op->extent.offset = offset;
647 op->extent.length = length;
648 op->extent.truncate_size = truncate_size;
649 op->extent.truncate_seq = truncate_seq;
650 if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
651 payload_len += length;
652
653 op->indata_len = payload_len;
654 }
655 EXPORT_SYMBOL(osd_req_op_extent_init);
656
657 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
658 unsigned int which, u64 length)
659 {
660 struct ceph_osd_req_op *op;
661 u64 previous;
662
663 BUG_ON(which >= osd_req->r_num_ops);
664 op = &osd_req->r_ops[which];
665 previous = op->extent.length;
666
667 if (length == previous)
668 return; /* Nothing to do */
669 BUG_ON(length > previous);
670
671 op->extent.length = length;
672 op->indata_len -= previous - length;
673 }
674 EXPORT_SYMBOL(osd_req_op_extent_update);
675
676 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
677 unsigned int which, u64 offset_inc)
678 {
679 struct ceph_osd_req_op *op, *prev_op;
680
681 BUG_ON(which + 1 >= osd_req->r_num_ops);
682
683 prev_op = &osd_req->r_ops[which];
684 op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
685 /* dup previous one */
686 op->indata_len = prev_op->indata_len;
687 op->outdata_len = prev_op->outdata_len;
688 op->extent = prev_op->extent;
689 /* adjust offset */
690 op->extent.offset += offset_inc;
691 op->extent.length -= offset_inc;
692
693 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
694 op->indata_len -= offset_inc;
695 }
696 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
697
698 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
699 u16 opcode, const char *class, const char *method)
700 {
701 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
702 opcode, 0);
703 struct ceph_pagelist *pagelist;
704 size_t payload_len = 0;
705 size_t size;
706
707 BUG_ON(opcode != CEPH_OSD_OP_CALL);
708
709 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
710 BUG_ON(!pagelist);
711 ceph_pagelist_init(pagelist);
712
713 op->cls.class_name = class;
714 size = strlen(class);
715 BUG_ON(size > (size_t) U8_MAX);
716 op->cls.class_len = size;
717 ceph_pagelist_append(pagelist, class, size);
718 payload_len += size;
719
720 op->cls.method_name = method;
721 size = strlen(method);
722 BUG_ON(size > (size_t) U8_MAX);
723 op->cls.method_len = size;
724 ceph_pagelist_append(pagelist, method, size);
725 payload_len += size;
726
727 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
728
729 op->indata_len = payload_len;
730 }
731 EXPORT_SYMBOL(osd_req_op_cls_init);
732
733 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
734 u16 opcode, const char *name, const void *value,
735 size_t size, u8 cmp_op, u8 cmp_mode)
736 {
737 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
738 opcode, 0);
739 struct ceph_pagelist *pagelist;
740 size_t payload_len;
741
742 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
743
744 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
745 if (!pagelist)
746 return -ENOMEM;
747
748 ceph_pagelist_init(pagelist);
749
750 payload_len = strlen(name);
751 op->xattr.name_len = payload_len;
752 ceph_pagelist_append(pagelist, name, payload_len);
753
754 op->xattr.value_len = size;
755 ceph_pagelist_append(pagelist, value, size);
756 payload_len += size;
757
758 op->xattr.cmp_op = cmp_op;
759 op->xattr.cmp_mode = cmp_mode;
760
761 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
762 op->indata_len = payload_len;
763 return 0;
764 }
765 EXPORT_SYMBOL(osd_req_op_xattr_init);
766
767 /*
768 * @watch_opcode: CEPH_OSD_WATCH_OP_*
769 */
770 static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
771 u64 cookie, u8 watch_opcode)
772 {
773 struct ceph_osd_req_op *op;
774
775 op = _osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
776 op->watch.cookie = cookie;
777 op->watch.op = watch_opcode;
778 op->watch.gen = 0;
779 }
780
781 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
782 unsigned int which,
783 u64 expected_object_size,
784 u64 expected_write_size)
785 {
786 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
787 CEPH_OSD_OP_SETALLOCHINT,
788 0);
789
790 op->alloc_hint.expected_object_size = expected_object_size;
791 op->alloc_hint.expected_write_size = expected_write_size;
792
793 /*
794 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
795 * not worth a feature bit. Set FAILOK per-op flag to make
796 * sure older osds don't trip over an unsupported opcode.
797 */
798 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
799 }
800 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
801
802 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
803 struct ceph_osd_data *osd_data)
804 {
805 u64 length = ceph_osd_data_length(osd_data);
806
807 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
808 BUG_ON(length > (u64) SIZE_MAX);
809 if (length)
810 ceph_msg_data_add_pages(msg, osd_data->pages,
811 length, osd_data->alignment);
812 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
813 BUG_ON(!length);
814 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
815 #ifdef CONFIG_BLOCK
816 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
817 ceph_msg_data_add_bio(msg, osd_data->bio, length);
818 #endif
819 } else {
820 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
821 }
822 }
823
824 static u32 osd_req_encode_op(struct ceph_osd_op *dst,
825 const struct ceph_osd_req_op *src)
826 {
827 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
828 pr_err("unrecognized osd opcode %d\n", src->op);
829
830 return 0;
831 }
832
833 switch (src->op) {
834 case CEPH_OSD_OP_STAT:
835 break;
836 case CEPH_OSD_OP_READ:
837 case CEPH_OSD_OP_WRITE:
838 case CEPH_OSD_OP_WRITEFULL:
839 case CEPH_OSD_OP_ZERO:
840 case CEPH_OSD_OP_TRUNCATE:
841 dst->extent.offset = cpu_to_le64(src->extent.offset);
842 dst->extent.length = cpu_to_le64(src->extent.length);
843 dst->extent.truncate_size =
844 cpu_to_le64(src->extent.truncate_size);
845 dst->extent.truncate_seq =
846 cpu_to_le32(src->extent.truncate_seq);
847 break;
848 case CEPH_OSD_OP_CALL:
849 dst->cls.class_len = src->cls.class_len;
850 dst->cls.method_len = src->cls.method_len;
851 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
852 break;
853 case CEPH_OSD_OP_STARTSYNC:
854 break;
855 case CEPH_OSD_OP_WATCH:
856 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
857 dst->watch.ver = cpu_to_le64(0);
858 dst->watch.op = src->watch.op;
859 dst->watch.gen = cpu_to_le32(src->watch.gen);
860 break;
861 case CEPH_OSD_OP_NOTIFY_ACK:
862 break;
863 case CEPH_OSD_OP_NOTIFY:
864 dst->notify.cookie = cpu_to_le64(src->notify.cookie);
865 break;
866 case CEPH_OSD_OP_SETALLOCHINT:
867 dst->alloc_hint.expected_object_size =
868 cpu_to_le64(src->alloc_hint.expected_object_size);
869 dst->alloc_hint.expected_write_size =
870 cpu_to_le64(src->alloc_hint.expected_write_size);
871 break;
872 case CEPH_OSD_OP_SETXATTR:
873 case CEPH_OSD_OP_CMPXATTR:
874 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
875 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
876 dst->xattr.cmp_op = src->xattr.cmp_op;
877 dst->xattr.cmp_mode = src->xattr.cmp_mode;
878 break;
879 case CEPH_OSD_OP_CREATE:
880 case CEPH_OSD_OP_DELETE:
881 break;
882 default:
883 pr_err("unsupported osd opcode %s\n",
884 ceph_osd_op_name(src->op));
885 WARN_ON(1);
886
887 return 0;
888 }
889
890 dst->op = cpu_to_le16(src->op);
891 dst->flags = cpu_to_le32(src->flags);
892 dst->payload_len = cpu_to_le32(src->indata_len);
893
894 return src->indata_len;
895 }
896
897 /*
898 * build new request AND message, calculate layout, and adjust file
899 * extent as needed.
900 *
901 * if the file was recently truncated, we include information about its
902 * old and new size so that the object can be updated appropriately. (we
903 * avoid synchronously deleting truncated objects because it's slow.)
904 *
905 * if @do_sync, include a 'startsync' command so that the osd will flush
906 * data quickly.
907 */
908 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
909 struct ceph_file_layout *layout,
910 struct ceph_vino vino,
911 u64 off, u64 *plen,
912 unsigned int which, int num_ops,
913 int opcode, int flags,
914 struct ceph_snap_context *snapc,
915 u32 truncate_seq,
916 u64 truncate_size,
917 bool use_mempool)
918 {
919 struct ceph_osd_request *req;
920 u64 objnum = 0;
921 u64 objoff = 0;
922 u64 objlen = 0;
923 int r;
924
925 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
926 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
927 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
928
929 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
930 GFP_NOFS);
931 if (!req) {
932 r = -ENOMEM;
933 goto fail;
934 }
935
936 /* calculate max write size */
937 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
938 if (r)
939 goto fail;
940
941 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
942 osd_req_op_init(req, which, opcode, 0);
943 } else {
944 u32 object_size = layout->object_size;
945 u32 object_base = off - objoff;
946 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
947 if (truncate_size <= object_base) {
948 truncate_size = 0;
949 } else {
950 truncate_size -= object_base;
951 if (truncate_size > object_size)
952 truncate_size = object_size;
953 }
954 }
955 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
956 truncate_size, truncate_seq);
957 }
958
959 req->r_flags = flags;
960 req->r_base_oloc.pool = layout->pool_id;
961 req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
962 ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
963
964 req->r_snapid = vino.snap;
965 if (flags & CEPH_OSD_FLAG_WRITE)
966 req->r_data_offset = off;
967
968 r = ceph_osdc_alloc_messages(req, GFP_NOFS);
969 if (r)
970 goto fail;
971
972 return req;
973
974 fail:
975 ceph_osdc_put_request(req);
976 return ERR_PTR(r);
977 }
978 EXPORT_SYMBOL(ceph_osdc_new_request);
979
980 /*
981 * We keep osd requests in an rbtree, sorted by ->r_tid.
982 */
983 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
984 DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
985
986 static bool osd_homeless(struct ceph_osd *osd)
987 {
988 return osd->o_osd == CEPH_HOMELESS_OSD;
989 }
990
991 static bool osd_registered(struct ceph_osd *osd)
992 {
993 verify_osdc_locked(osd->o_osdc);
994
995 return !RB_EMPTY_NODE(&osd->o_node);
996 }
997
998 /*
999 * Assumes @osd is zero-initialized.
1000 */
1001 static void osd_init(struct ceph_osd *osd)
1002 {
1003 atomic_set(&osd->o_ref, 1);
1004 RB_CLEAR_NODE(&osd->o_node);
1005 osd->o_requests = RB_ROOT;
1006 osd->o_linger_requests = RB_ROOT;
1007 INIT_LIST_HEAD(&osd->o_osd_lru);
1008 INIT_LIST_HEAD(&osd->o_keepalive_item);
1009 osd->o_incarnation = 1;
1010 mutex_init(&osd->lock);
1011 }
1012
1013 static void osd_cleanup(struct ceph_osd *osd)
1014 {
1015 WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1016 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1017 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1018 WARN_ON(!list_empty(&osd->o_osd_lru));
1019 WARN_ON(!list_empty(&osd->o_keepalive_item));
1020
1021 if (osd->o_auth.authorizer) {
1022 WARN_ON(osd_homeless(osd));
1023 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1024 }
1025 }
1026
1027 /*
1028 * Track open sessions with osds.
1029 */
1030 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1031 {
1032 struct ceph_osd *osd;
1033
1034 WARN_ON(onum == CEPH_HOMELESS_OSD);
1035
1036 osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1037 osd_init(osd);
1038 osd->o_osdc = osdc;
1039 osd->o_osd = onum;
1040
1041 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1042
1043 return osd;
1044 }
1045
1046 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1047 {
1048 if (atomic_inc_not_zero(&osd->o_ref)) {
1049 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1050 atomic_read(&osd->o_ref));
1051 return osd;
1052 } else {
1053 dout("get_osd %p FAIL\n", osd);
1054 return NULL;
1055 }
1056 }
1057
1058 static void put_osd(struct ceph_osd *osd)
1059 {
1060 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1061 atomic_read(&osd->o_ref) - 1);
1062 if (atomic_dec_and_test(&osd->o_ref)) {
1063 osd_cleanup(osd);
1064 kfree(osd);
1065 }
1066 }
1067
1068 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1069
1070 static void __move_osd_to_lru(struct ceph_osd *osd)
1071 {
1072 struct ceph_osd_client *osdc = osd->o_osdc;
1073
1074 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1075 BUG_ON(!list_empty(&osd->o_osd_lru));
1076
1077 spin_lock(&osdc->osd_lru_lock);
1078 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1079 spin_unlock(&osdc->osd_lru_lock);
1080
1081 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1082 }
1083
1084 static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1085 {
1086 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1087 RB_EMPTY_ROOT(&osd->o_linger_requests))
1088 __move_osd_to_lru(osd);
1089 }
1090
1091 static void __remove_osd_from_lru(struct ceph_osd *osd)
1092 {
1093 struct ceph_osd_client *osdc = osd->o_osdc;
1094
1095 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1096
1097 spin_lock(&osdc->osd_lru_lock);
1098 if (!list_empty(&osd->o_osd_lru))
1099 list_del_init(&osd->o_osd_lru);
1100 spin_unlock(&osdc->osd_lru_lock);
1101 }
1102
1103 /*
1104 * Close the connection and assign any leftover requests to the
1105 * homeless session.
1106 */
1107 static void close_osd(struct ceph_osd *osd)
1108 {
1109 struct ceph_osd_client *osdc = osd->o_osdc;
1110 struct rb_node *n;
1111
1112 verify_osdc_wrlocked(osdc);
1113 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1114
1115 ceph_con_close(&osd->o_con);
1116
1117 for (n = rb_first(&osd->o_requests); n; ) {
1118 struct ceph_osd_request *req =
1119 rb_entry(n, struct ceph_osd_request, r_node);
1120
1121 n = rb_next(n); /* unlink_request() */
1122
1123 dout(" reassigning req %p tid %llu\n", req, req->r_tid);
1124 unlink_request(osd, req);
1125 link_request(&osdc->homeless_osd, req);
1126 }
1127 for (n = rb_first(&osd->o_linger_requests); n; ) {
1128 struct ceph_osd_linger_request *lreq =
1129 rb_entry(n, struct ceph_osd_linger_request, node);
1130
1131 n = rb_next(n); /* unlink_linger() */
1132
1133 dout(" reassigning lreq %p linger_id %llu\n", lreq,
1134 lreq->linger_id);
1135 unlink_linger(osd, lreq);
1136 link_linger(&osdc->homeless_osd, lreq);
1137 }
1138
1139 __remove_osd_from_lru(osd);
1140 erase_osd(&osdc->osds, osd);
1141 put_osd(osd);
1142 }
1143
1144 /*
1145 * reset osd connect
1146 */
1147 static int reopen_osd(struct ceph_osd *osd)
1148 {
1149 struct ceph_entity_addr *peer_addr;
1150
1151 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1152
1153 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1154 RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1155 close_osd(osd);
1156 return -ENODEV;
1157 }
1158
1159 peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
1160 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1161 !ceph_con_opened(&osd->o_con)) {
1162 struct rb_node *n;
1163
1164 dout("osd addr hasn't changed and connection never opened, "
1165 "letting msgr retry\n");
1166 /* touch each r_stamp for handle_timeout()'s benfit */
1167 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
1168 struct ceph_osd_request *req =
1169 rb_entry(n, struct ceph_osd_request, r_node);
1170 req->r_stamp = jiffies;
1171 }
1172
1173 return -EAGAIN;
1174 }
1175
1176 ceph_con_close(&osd->o_con);
1177 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1178 osd->o_incarnation++;
1179
1180 return 0;
1181 }
1182
1183 static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
1184 bool wrlocked)
1185 {
1186 struct ceph_osd *osd;
1187
1188 if (wrlocked)
1189 verify_osdc_wrlocked(osdc);
1190 else
1191 verify_osdc_locked(osdc);
1192
1193 if (o != CEPH_HOMELESS_OSD)
1194 osd = lookup_osd(&osdc->osds, o);
1195 else
1196 osd = &osdc->homeless_osd;
1197 if (!osd) {
1198 if (!wrlocked)
1199 return ERR_PTR(-EAGAIN);
1200
1201 osd = create_osd(osdc, o);
1202 insert_osd(&osdc->osds, osd);
1203 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
1204 &osdc->osdmap->osd_addr[osd->o_osd]);
1205 }
1206
1207 dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
1208 return osd;
1209 }
1210
1211 /*
1212 * Create request <-> OSD session relation.
1213 *
1214 * @req has to be assigned a tid, @osd may be homeless.
1215 */
1216 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1217 {
1218 verify_osd_locked(osd);
1219 WARN_ON(!req->r_tid || req->r_osd);
1220 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1221 req, req->r_tid);
1222
1223 if (!osd_homeless(osd))
1224 __remove_osd_from_lru(osd);
1225 else
1226 atomic_inc(&osd->o_osdc->num_homeless);
1227
1228 get_osd(osd);
1229 insert_request(&osd->o_requests, req);
1230 req->r_osd = osd;
1231 }
1232
1233 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1234 {
1235 verify_osd_locked(osd);
1236 WARN_ON(req->r_osd != osd);
1237 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1238 req, req->r_tid);
1239
1240 req->r_osd = NULL;
1241 erase_request(&osd->o_requests, req);
1242 put_osd(osd);
1243
1244 if (!osd_homeless(osd))
1245 maybe_move_osd_to_lru(osd);
1246 else
1247 atomic_dec(&osd->o_osdc->num_homeless);
1248 }
1249
1250 static bool __pool_full(struct ceph_pg_pool_info *pi)
1251 {
1252 return pi->flags & CEPH_POOL_FLAG_FULL;
1253 }
1254
1255 static bool have_pool_full(struct ceph_osd_client *osdc)
1256 {
1257 struct rb_node *n;
1258
1259 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
1260 struct ceph_pg_pool_info *pi =
1261 rb_entry(n, struct ceph_pg_pool_info, node);
1262
1263 if (__pool_full(pi))
1264 return true;
1265 }
1266
1267 return false;
1268 }
1269
1270 static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
1271 {
1272 struct ceph_pg_pool_info *pi;
1273
1274 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
1275 if (!pi)
1276 return false;
1277
1278 return __pool_full(pi);
1279 }
1280
1281 /*
1282 * Returns whether a request should be blocked from being sent
1283 * based on the current osdmap and osd_client settings.
1284 */
1285 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1286 const struct ceph_osd_request_target *t,
1287 struct ceph_pg_pool_info *pi)
1288 {
1289 bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
1290 bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
1291 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1292 __pool_full(pi);
1293
1294 WARN_ON(pi->id != t->base_oloc.pool);
1295 return (t->flags & CEPH_OSD_FLAG_READ && pauserd) ||
1296 (t->flags & CEPH_OSD_FLAG_WRITE && pausewr);
1297 }
1298
1299 enum calc_target_result {
1300 CALC_TARGET_NO_ACTION = 0,
1301 CALC_TARGET_NEED_RESEND,
1302 CALC_TARGET_POOL_DNE,
1303 };
1304
1305 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1306 struct ceph_osd_request_target *t,
1307 u32 *last_force_resend,
1308 bool any_change)
1309 {
1310 struct ceph_pg_pool_info *pi;
1311 struct ceph_pg pgid, last_pgid;
1312 struct ceph_osds up, acting;
1313 bool force_resend = false;
1314 bool need_check_tiering = false;
1315 bool need_resend = false;
1316 bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1317 enum calc_target_result ct_res;
1318 int ret;
1319
1320 pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1321 if (!pi) {
1322 t->osd = CEPH_HOMELESS_OSD;
1323 ct_res = CALC_TARGET_POOL_DNE;
1324 goto out;
1325 }
1326
1327 if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1328 if (last_force_resend &&
1329 *last_force_resend < pi->last_force_request_resend) {
1330 *last_force_resend = pi->last_force_request_resend;
1331 force_resend = true;
1332 } else if (!last_force_resend) {
1333 force_resend = true;
1334 }
1335 }
1336 if (ceph_oid_empty(&t->target_oid) || force_resend) {
1337 ceph_oid_copy(&t->target_oid, &t->base_oid);
1338 need_check_tiering = true;
1339 }
1340 if (ceph_oloc_empty(&t->target_oloc) || force_resend) {
1341 ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1342 need_check_tiering = true;
1343 }
1344
1345 if (need_check_tiering &&
1346 (t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1347 if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
1348 t->target_oloc.pool = pi->read_tier;
1349 if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
1350 t->target_oloc.pool = pi->write_tier;
1351 }
1352
1353 ret = ceph_object_locator_to_pg(osdc->osdmap, &t->target_oid,
1354 &t->target_oloc, &pgid);
1355 if (ret) {
1356 WARN_ON(ret != -ENOENT);
1357 t->osd = CEPH_HOMELESS_OSD;
1358 ct_res = CALC_TARGET_POOL_DNE;
1359 goto out;
1360 }
1361 last_pgid.pool = pgid.pool;
1362 last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1363
1364 ceph_pg_to_up_acting_osds(osdc->osdmap, &pgid, &up, &acting);
1365 if (any_change &&
1366 ceph_is_new_interval(&t->acting,
1367 &acting,
1368 &t->up,
1369 &up,
1370 t->size,
1371 pi->size,
1372 t->min_size,
1373 pi->min_size,
1374 t->pg_num,
1375 pi->pg_num,
1376 t->sort_bitwise,
1377 sort_bitwise,
1378 &last_pgid))
1379 force_resend = true;
1380
1381 if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1382 t->paused = false;
1383 need_resend = true;
1384 }
1385
1386 if (ceph_pg_compare(&t->pgid, &pgid) ||
1387 ceph_osds_changed(&t->acting, &acting, any_change) ||
1388 force_resend) {
1389 t->pgid = pgid; /* struct */
1390 ceph_osds_copy(&t->acting, &acting);
1391 ceph_osds_copy(&t->up, &up);
1392 t->size = pi->size;
1393 t->min_size = pi->min_size;
1394 t->pg_num = pi->pg_num;
1395 t->pg_num_mask = pi->pg_num_mask;
1396 t->sort_bitwise = sort_bitwise;
1397
1398 t->osd = acting.primary;
1399 need_resend = true;
1400 }
1401
1402 ct_res = need_resend ? CALC_TARGET_NEED_RESEND : CALC_TARGET_NO_ACTION;
1403 out:
1404 dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
1405 return ct_res;
1406 }
1407
1408 static void setup_request_data(struct ceph_osd_request *req,
1409 struct ceph_msg *msg)
1410 {
1411 u32 data_len = 0;
1412 int i;
1413
1414 if (!list_empty(&msg->data))
1415 return;
1416
1417 WARN_ON(msg->data_length);
1418 for (i = 0; i < req->r_num_ops; i++) {
1419 struct ceph_osd_req_op *op = &req->r_ops[i];
1420
1421 switch (op->op) {
1422 /* request */
1423 case CEPH_OSD_OP_WRITE:
1424 case CEPH_OSD_OP_WRITEFULL:
1425 WARN_ON(op->indata_len != op->extent.length);
1426 ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
1427 break;
1428 case CEPH_OSD_OP_SETXATTR:
1429 case CEPH_OSD_OP_CMPXATTR:
1430 WARN_ON(op->indata_len != op->xattr.name_len +
1431 op->xattr.value_len);
1432 ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
1433 break;
1434 case CEPH_OSD_OP_NOTIFY_ACK:
1435 ceph_osdc_msg_data_add(msg,
1436 &op->notify_ack.request_data);
1437 break;
1438
1439 /* reply */
1440 case CEPH_OSD_OP_STAT:
1441 ceph_osdc_msg_data_add(req->r_reply,
1442 &op->raw_data_in);
1443 break;
1444 case CEPH_OSD_OP_READ:
1445 ceph_osdc_msg_data_add(req->r_reply,
1446 &op->extent.osd_data);
1447 break;
1448
1449 /* both */
1450 case CEPH_OSD_OP_CALL:
1451 WARN_ON(op->indata_len != op->cls.class_len +
1452 op->cls.method_len +
1453 op->cls.indata_len);
1454 ceph_osdc_msg_data_add(msg, &op->cls.request_info);
1455 /* optional, can be NONE */
1456 ceph_osdc_msg_data_add(msg, &op->cls.request_data);
1457 /* optional, can be NONE */
1458 ceph_osdc_msg_data_add(req->r_reply,
1459 &op->cls.response_data);
1460 break;
1461 case CEPH_OSD_OP_NOTIFY:
1462 ceph_osdc_msg_data_add(msg,
1463 &op->notify.request_data);
1464 ceph_osdc_msg_data_add(req->r_reply,
1465 &op->notify.response_data);
1466 break;
1467 }
1468
1469 data_len += op->indata_len;
1470 }
1471
1472 WARN_ON(data_len != msg->data_length);
1473 }
1474
1475 static void encode_request(struct ceph_osd_request *req, struct ceph_msg *msg)
1476 {
1477 void *p = msg->front.iov_base;
1478 void *const end = p + msg->front_alloc_len;
1479 u32 data_len = 0;
1480 int i;
1481
1482 if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
1483 /* snapshots aren't writeable */
1484 WARN_ON(req->r_snapid != CEPH_NOSNAP);
1485 } else {
1486 WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
1487 req->r_data_offset || req->r_snapc);
1488 }
1489
1490 setup_request_data(req, msg);
1491
1492 ceph_encode_32(&p, 1); /* client_inc, always 1 */
1493 ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
1494 ceph_encode_32(&p, req->r_flags);
1495 ceph_encode_timespec(p, &req->r_mtime);
1496 p += sizeof(struct ceph_timespec);
1497 /* aka reassert_version */
1498 memcpy(p, &req->r_replay_version, sizeof(req->r_replay_version));
1499 p += sizeof(req->r_replay_version);
1500
1501 /* oloc */
1502 ceph_start_encoding(&p, 5, 4,
1503 ceph_oloc_encoding_size(&req->r_t.target_oloc));
1504 ceph_encode_64(&p, req->r_t.target_oloc.pool);
1505 ceph_encode_32(&p, -1); /* preferred */
1506 ceph_encode_32(&p, 0); /* key len */
1507 if (req->r_t.target_oloc.pool_ns)
1508 ceph_encode_string(&p, end, req->r_t.target_oloc.pool_ns->str,
1509 req->r_t.target_oloc.pool_ns->len);
1510 else
1511 ceph_encode_32(&p, 0);
1512
1513 /* pgid */
1514 ceph_encode_8(&p, 1);
1515 ceph_encode_64(&p, req->r_t.pgid.pool);
1516 ceph_encode_32(&p, req->r_t.pgid.seed);
1517 ceph_encode_32(&p, -1); /* preferred */
1518
1519 /* oid */
1520 ceph_encode_32(&p, req->r_t.target_oid.name_len);
1521 memcpy(p, req->r_t.target_oid.name, req->r_t.target_oid.name_len);
1522 p += req->r_t.target_oid.name_len;
1523
1524 /* ops, can imply data */
1525 ceph_encode_16(&p, req->r_num_ops);
1526 for (i = 0; i < req->r_num_ops; i++) {
1527 data_len += osd_req_encode_op(p, &req->r_ops[i]);
1528 p += sizeof(struct ceph_osd_op);
1529 }
1530
1531 ceph_encode_64(&p, req->r_snapid); /* snapid */
1532 if (req->r_snapc) {
1533 ceph_encode_64(&p, req->r_snapc->seq);
1534 ceph_encode_32(&p, req->r_snapc->num_snaps);
1535 for (i = 0; i < req->r_snapc->num_snaps; i++)
1536 ceph_encode_64(&p, req->r_snapc->snaps[i]);
1537 } else {
1538 ceph_encode_64(&p, 0); /* snap_seq */
1539 ceph_encode_32(&p, 0); /* snaps len */
1540 }
1541
1542 ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
1543
1544 BUG_ON(p > end);
1545 msg->front.iov_len = p - msg->front.iov_base;
1546 msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
1547 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1548 msg->hdr.data_len = cpu_to_le32(data_len);
1549 /*
1550 * The header "data_off" is a hint to the receiver allowing it
1551 * to align received data into its buffers such that there's no
1552 * need to re-copy it before writing it to disk (direct I/O).
1553 */
1554 msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
1555
1556 dout("%s req %p oid %s oid_len %d front %zu data %u\n", __func__,
1557 req, req->r_t.target_oid.name, req->r_t.target_oid.name_len,
1558 msg->front.iov_len, data_len);
1559 }
1560
1561 /*
1562 * @req has to be assigned a tid and registered.
1563 */
1564 static void send_request(struct ceph_osd_request *req)
1565 {
1566 struct ceph_osd *osd = req->r_osd;
1567
1568 verify_osd_locked(osd);
1569 WARN_ON(osd->o_osd != req->r_t.osd);
1570
1571 /*
1572 * We may have a previously queued request message hanging
1573 * around. Cancel it to avoid corrupting the msgr.
1574 */
1575 if (req->r_sent)
1576 ceph_msg_revoke(req->r_request);
1577
1578 req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
1579 if (req->r_attempts)
1580 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1581 else
1582 WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);
1583
1584 encode_request(req, req->r_request);
1585
1586 dout("%s req %p tid %llu to pg %llu.%x osd%d flags 0x%x attempt %d\n",
1587 __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
1588 req->r_t.osd, req->r_flags, req->r_attempts);
1589
1590 req->r_t.paused = false;
1591 req->r_stamp = jiffies;
1592 req->r_attempts++;
1593
1594 req->r_sent = osd->o_incarnation;
1595 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1596 ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
1597 }
1598
1599 static void maybe_request_map(struct ceph_osd_client *osdc)
1600 {
1601 bool continuous = false;
1602
1603 verify_osdc_locked(osdc);
1604 WARN_ON(!osdc->osdmap->epoch);
1605
1606 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1607 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
1608 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
1609 dout("%s osdc %p continuous\n", __func__, osdc);
1610 continuous = true;
1611 } else {
1612 dout("%s osdc %p onetime\n", __func__, osdc);
1613 }
1614
1615 if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
1616 osdc->osdmap->epoch + 1, continuous))
1617 ceph_monc_renew_subs(&osdc->client->monc);
1618 }
1619
1620 static void send_map_check(struct ceph_osd_request *req);
1621
1622 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
1623 {
1624 struct ceph_osd_client *osdc = req->r_osdc;
1625 struct ceph_osd *osd;
1626 enum calc_target_result ct_res;
1627 bool need_send = false;
1628 bool promoted = false;
1629
1630 WARN_ON(req->r_tid || req->r_got_reply);
1631 dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
1632
1633 again:
1634 ct_res = calc_target(osdc, &req->r_t, &req->r_last_force_resend, false);
1635 if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
1636 goto promote;
1637
1638 osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
1639 if (IS_ERR(osd)) {
1640 WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
1641 goto promote;
1642 }
1643
1644 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1645 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
1646 dout("req %p pausewr\n", req);
1647 req->r_t.paused = true;
1648 maybe_request_map(osdc);
1649 } else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1650 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
1651 dout("req %p pauserd\n", req);
1652 req->r_t.paused = true;
1653 maybe_request_map(osdc);
1654 } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1655 !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
1656 CEPH_OSD_FLAG_FULL_FORCE)) &&
1657 (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1658 pool_full(osdc, req->r_t.base_oloc.pool))) {
1659 dout("req %p full/pool_full\n", req);
1660 pr_warn_ratelimited("FULL or reached pool quota\n");
1661 req->r_t.paused = true;
1662 maybe_request_map(osdc);
1663 } else if (!osd_homeless(osd)) {
1664 need_send = true;
1665 } else {
1666 maybe_request_map(osdc);
1667 }
1668
1669 mutex_lock(&osd->lock);
1670 /*
1671 * Assign the tid atomically with send_request() to protect
1672 * multiple writes to the same object from racing with each
1673 * other, resulting in out of order ops on the OSDs.
1674 */
1675 req->r_tid = atomic64_inc_return(&osdc->last_tid);
1676 link_request(osd, req);
1677 if (need_send)
1678 send_request(req);
1679 mutex_unlock(&osd->lock);
1680
1681 if (ct_res == CALC_TARGET_POOL_DNE)
1682 send_map_check(req);
1683
1684 if (promoted)
1685 downgrade_write(&osdc->lock);
1686 return;
1687
1688 promote:
1689 up_read(&osdc->lock);
1690 down_write(&osdc->lock);
1691 wrlocked = true;
1692 promoted = true;
1693 goto again;
1694 }
1695
1696 static void account_request(struct ceph_osd_request *req)
1697 {
1698 unsigned int mask = CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK;
1699
1700 if (req->r_flags & CEPH_OSD_FLAG_READ) {
1701 WARN_ON(req->r_flags & mask);
1702 req->r_flags |= CEPH_OSD_FLAG_ACK;
1703 } else if (req->r_flags & CEPH_OSD_FLAG_WRITE)
1704 WARN_ON(!(req->r_flags & mask));
1705 else
1706 WARN_ON(1);
1707
1708 WARN_ON(req->r_unsafe_callback && (req->r_flags & mask) != mask);
1709 atomic_inc(&req->r_osdc->num_requests);
1710 }
1711
1712 static void submit_request(struct ceph_osd_request *req, bool wrlocked)
1713 {
1714 ceph_osdc_get_request(req);
1715 account_request(req);
1716 __submit_request(req, wrlocked);
1717 }
1718
1719 static void __finish_request(struct ceph_osd_request *req)
1720 {
1721 struct ceph_osd_client *osdc = req->r_osdc;
1722 struct ceph_osd *osd = req->r_osd;
1723
1724 verify_osd_locked(osd);
1725 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
1726
1727 WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
1728 unlink_request(osd, req);
1729 atomic_dec(&osdc->num_requests);
1730
1731 /*
1732 * If an OSD has failed or returned and a request has been sent
1733 * twice, it's possible to get a reply and end up here while the
1734 * request message is queued for delivery. We will ignore the
1735 * reply, so not a big deal, but better to try and catch it.
1736 */
1737 ceph_msg_revoke(req->r_request);
1738 ceph_msg_revoke_incoming(req->r_reply);
1739 }
1740
1741 static void finish_request(struct ceph_osd_request *req)
1742 {
1743 __finish_request(req);
1744 ceph_osdc_put_request(req);
1745 }
1746
1747 static void __complete_request(struct ceph_osd_request *req)
1748 {
1749 if (req->r_callback)
1750 req->r_callback(req);
1751 else
1752 complete_all(&req->r_completion);
1753 }
1754
1755 /*
1756 * Note that this is open-coded in handle_reply(), which has to deal
1757 * with ack vs commit, dup acks, etc.
1758 */
1759 static void complete_request(struct ceph_osd_request *req, int err)
1760 {
1761 dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
1762
1763 req->r_result = err;
1764 __finish_request(req);
1765 __complete_request(req);
1766 complete_all(&req->r_safe_completion);
1767 ceph_osdc_put_request(req);
1768 }
1769
1770 static void cancel_map_check(struct ceph_osd_request *req)
1771 {
1772 struct ceph_osd_client *osdc = req->r_osdc;
1773 struct ceph_osd_request *lookup_req;
1774
1775 verify_osdc_wrlocked(osdc);
1776
1777 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
1778 if (!lookup_req)
1779 return;
1780
1781 WARN_ON(lookup_req != req);
1782 erase_request_mc(&osdc->map_checks, req);
1783 ceph_osdc_put_request(req);
1784 }
1785
1786 static void cancel_request(struct ceph_osd_request *req)
1787 {
1788 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
1789
1790 cancel_map_check(req);
1791 finish_request(req);
1792 }
1793
1794 static void check_pool_dne(struct ceph_osd_request *req)
1795 {
1796 struct ceph_osd_client *osdc = req->r_osdc;
1797 struct ceph_osdmap *map = osdc->osdmap;
1798
1799 verify_osdc_wrlocked(osdc);
1800 WARN_ON(!map->epoch);
1801
1802 if (req->r_attempts) {
1803 /*
1804 * We sent a request earlier, which means that
1805 * previously the pool existed, and now it does not
1806 * (i.e., it was deleted).
1807 */
1808 req->r_map_dne_bound = map->epoch;
1809 dout("%s req %p tid %llu pool disappeared\n", __func__, req,
1810 req->r_tid);
1811 } else {
1812 dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
1813 req, req->r_tid, req->r_map_dne_bound, map->epoch);
1814 }
1815
1816 if (req->r_map_dne_bound) {
1817 if (map->epoch >= req->r_map_dne_bound) {
1818 /* we had a new enough map */
1819 pr_info_ratelimited("tid %llu pool does not exist\n",
1820 req->r_tid);
1821 complete_request(req, -ENOENT);
1822 }
1823 } else {
1824 send_map_check(req);
1825 }
1826 }
1827
1828 static void map_check_cb(struct ceph_mon_generic_request *greq)
1829 {
1830 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
1831 struct ceph_osd_request *req;
1832 u64 tid = greq->private_data;
1833
1834 WARN_ON(greq->result || !greq->u.newest);
1835
1836 down_write(&osdc->lock);
1837 req = lookup_request_mc(&osdc->map_checks, tid);
1838 if (!req) {
1839 dout("%s tid %llu dne\n", __func__, tid);
1840 goto out_unlock;
1841 }
1842
1843 dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
1844 req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
1845 if (!req->r_map_dne_bound)
1846 req->r_map_dne_bound = greq->u.newest;
1847 erase_request_mc(&osdc->map_checks, req);
1848 check_pool_dne(req);
1849
1850 ceph_osdc_put_request(req);
1851 out_unlock:
1852 up_write(&osdc->lock);
1853 }
1854
1855 static void send_map_check(struct ceph_osd_request *req)
1856 {
1857 struct ceph_osd_client *osdc = req->r_osdc;
1858 struct ceph_osd_request *lookup_req;
1859 int ret;
1860
1861 verify_osdc_wrlocked(osdc);
1862
1863 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
1864 if (lookup_req) {
1865 WARN_ON(lookup_req != req);
1866 return;
1867 }
1868
1869 ceph_osdc_get_request(req);
1870 insert_request_mc(&osdc->map_checks, req);
1871 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
1872 map_check_cb, req->r_tid);
1873 WARN_ON(ret);
1874 }
1875
1876 /*
1877 * lingering requests, watch/notify v2 infrastructure
1878 */
1879 static void linger_release(struct kref *kref)
1880 {
1881 struct ceph_osd_linger_request *lreq =
1882 container_of(kref, struct ceph_osd_linger_request, kref);
1883
1884 dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
1885 lreq->reg_req, lreq->ping_req);
1886 WARN_ON(!RB_EMPTY_NODE(&lreq->node));
1887 WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
1888 WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
1889 WARN_ON(!list_empty(&lreq->scan_item));
1890 WARN_ON(!list_empty(&lreq->pending_lworks));
1891 WARN_ON(lreq->osd);
1892
1893 if (lreq->reg_req)
1894 ceph_osdc_put_request(lreq->reg_req);
1895 if (lreq->ping_req)
1896 ceph_osdc_put_request(lreq->ping_req);
1897 target_destroy(&lreq->t);
1898 kfree(lreq);
1899 }
1900
1901 static void linger_put(struct ceph_osd_linger_request *lreq)
1902 {
1903 if (lreq)
1904 kref_put(&lreq->kref, linger_release);
1905 }
1906
1907 static struct ceph_osd_linger_request *
1908 linger_get(struct ceph_osd_linger_request *lreq)
1909 {
1910 kref_get(&lreq->kref);
1911 return lreq;
1912 }
1913
1914 static struct ceph_osd_linger_request *
1915 linger_alloc(struct ceph_osd_client *osdc)
1916 {
1917 struct ceph_osd_linger_request *lreq;
1918
1919 lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
1920 if (!lreq)
1921 return NULL;
1922
1923 kref_init(&lreq->kref);
1924 mutex_init(&lreq->lock);
1925 RB_CLEAR_NODE(&lreq->node);
1926 RB_CLEAR_NODE(&lreq->osdc_node);
1927 RB_CLEAR_NODE(&lreq->mc_node);
1928 INIT_LIST_HEAD(&lreq->scan_item);
1929 INIT_LIST_HEAD(&lreq->pending_lworks);
1930 init_completion(&lreq->reg_commit_wait);
1931 init_completion(&lreq->notify_finish_wait);
1932
1933 lreq->osdc = osdc;
1934 target_init(&lreq->t);
1935
1936 dout("%s lreq %p\n", __func__, lreq);
1937 return lreq;
1938 }
1939
1940 DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
1941 DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
1942 DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
1943
1944 /*
1945 * Create linger request <-> OSD session relation.
1946 *
1947 * @lreq has to be registered, @osd may be homeless.
1948 */
1949 static void link_linger(struct ceph_osd *osd,
1950 struct ceph_osd_linger_request *lreq)
1951 {
1952 verify_osd_locked(osd);
1953 WARN_ON(!lreq->linger_id || lreq->osd);
1954 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
1955 osd->o_osd, lreq, lreq->linger_id);
1956
1957 if (!osd_homeless(osd))
1958 __remove_osd_from_lru(osd);
1959 else
1960 atomic_inc(&osd->o_osdc->num_homeless);
1961
1962 get_osd(osd);
1963 insert_linger(&osd->o_linger_requests, lreq);
1964 lreq->osd = osd;
1965 }
1966
1967 static void unlink_linger(struct ceph_osd *osd,
1968 struct ceph_osd_linger_request *lreq)
1969 {
1970 verify_osd_locked(osd);
1971 WARN_ON(lreq->osd != osd);
1972 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
1973 osd->o_osd, lreq, lreq->linger_id);
1974
1975 lreq->osd = NULL;
1976 erase_linger(&osd->o_linger_requests, lreq);
1977 put_osd(osd);
1978
1979 if (!osd_homeless(osd))
1980 maybe_move_osd_to_lru(osd);
1981 else
1982 atomic_dec(&osd->o_osdc->num_homeless);
1983 }
1984
1985 static bool __linger_registered(struct ceph_osd_linger_request *lreq)
1986 {
1987 verify_osdc_locked(lreq->osdc);
1988
1989 return !RB_EMPTY_NODE(&lreq->osdc_node);
1990 }
1991
1992 static bool linger_registered(struct ceph_osd_linger_request *lreq)
1993 {
1994 struct ceph_osd_client *osdc = lreq->osdc;
1995 bool registered;
1996
1997 down_read(&osdc->lock);
1998 registered = __linger_registered(lreq);
1999 up_read(&osdc->lock);
2000
2001 return registered;
2002 }
2003
2004 static void linger_register(struct ceph_osd_linger_request *lreq)
2005 {
2006 struct ceph_osd_client *osdc = lreq->osdc;
2007
2008 verify_osdc_wrlocked(osdc);
2009 WARN_ON(lreq->linger_id);
2010
2011 linger_get(lreq);
2012 lreq->linger_id = ++osdc->last_linger_id;
2013 insert_linger_osdc(&osdc->linger_requests, lreq);
2014 }
2015
2016 static void linger_unregister(struct ceph_osd_linger_request *lreq)
2017 {
2018 struct ceph_osd_client *osdc = lreq->osdc;
2019
2020 verify_osdc_wrlocked(osdc);
2021
2022 erase_linger_osdc(&osdc->linger_requests, lreq);
2023 linger_put(lreq);
2024 }
2025
2026 static void cancel_linger_request(struct ceph_osd_request *req)
2027 {
2028 struct ceph_osd_linger_request *lreq = req->r_priv;
2029
2030 WARN_ON(!req->r_linger);
2031 cancel_request(req);
2032 linger_put(lreq);
2033 }
2034
2035 struct linger_work {
2036 struct work_struct work;
2037 struct ceph_osd_linger_request *lreq;
2038 struct list_head pending_item;
2039 unsigned long queued_stamp;
2040
2041 union {
2042 struct {
2043 u64 notify_id;
2044 u64 notifier_id;
2045 void *payload; /* points into @msg front */
2046 size_t payload_len;
2047
2048 struct ceph_msg *msg; /* for ceph_msg_put() */
2049 } notify;
2050 struct {
2051 int err;
2052 } error;
2053 };
2054 };
2055
2056 static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
2057 work_func_t workfn)
2058 {
2059 struct linger_work *lwork;
2060
2061 lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
2062 if (!lwork)
2063 return NULL;
2064
2065 INIT_WORK(&lwork->work, workfn);
2066 INIT_LIST_HEAD(&lwork->pending_item);
2067 lwork->lreq = linger_get(lreq);
2068
2069 return lwork;
2070 }
2071
2072 static void lwork_free(struct linger_work *lwork)
2073 {
2074 struct ceph_osd_linger_request *lreq = lwork->lreq;
2075
2076 mutex_lock(&lreq->lock);
2077 list_del(&lwork->pending_item);
2078 mutex_unlock(&lreq->lock);
2079
2080 linger_put(lreq);
2081 kfree(lwork);
2082 }
2083
2084 static void lwork_queue(struct linger_work *lwork)
2085 {
2086 struct ceph_osd_linger_request *lreq = lwork->lreq;
2087 struct ceph_osd_client *osdc = lreq->osdc;
2088
2089 verify_lreq_locked(lreq);
2090 WARN_ON(!list_empty(&lwork->pending_item));
2091
2092 lwork->queued_stamp = jiffies;
2093 list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2094 queue_work(osdc->notify_wq, &lwork->work);
2095 }
2096
2097 static void do_watch_notify(struct work_struct *w)
2098 {
2099 struct linger_work *lwork = container_of(w, struct linger_work, work);
2100 struct ceph_osd_linger_request *lreq = lwork->lreq;
2101
2102 if (!linger_registered(lreq)) {
2103 dout("%s lreq %p not registered\n", __func__, lreq);
2104 goto out;
2105 }
2106
2107 WARN_ON(!lreq->is_watch);
2108 dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
2109 __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
2110 lwork->notify.payload_len);
2111 lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
2112 lwork->notify.notifier_id, lwork->notify.payload,
2113 lwork->notify.payload_len);
2114
2115 out:
2116 ceph_msg_put(lwork->notify.msg);
2117 lwork_free(lwork);
2118 }
2119
2120 static void do_watch_error(struct work_struct *w)
2121 {
2122 struct linger_work *lwork = container_of(w, struct linger_work, work);
2123 struct ceph_osd_linger_request *lreq = lwork->lreq;
2124
2125 if (!linger_registered(lreq)) {
2126 dout("%s lreq %p not registered\n", __func__, lreq);
2127 goto out;
2128 }
2129
2130 dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
2131 lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);
2132
2133 out:
2134 lwork_free(lwork);
2135 }
2136
2137 static void queue_watch_error(struct ceph_osd_linger_request *lreq)
2138 {
2139 struct linger_work *lwork;
2140
2141 lwork = lwork_alloc(lreq, do_watch_error);
2142 if (!lwork) {
2143 pr_err("failed to allocate error-lwork\n");
2144 return;
2145 }
2146
2147 lwork->error.err = lreq->last_error;
2148 lwork_queue(lwork);
2149 }
2150
2151 static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
2152 int result)
2153 {
2154 if (!completion_done(&lreq->reg_commit_wait)) {
2155 lreq->reg_commit_error = (result <= 0 ? result : 0);
2156 complete_all(&lreq->reg_commit_wait);
2157 }
2158 }
2159
2160 static void linger_commit_cb(struct ceph_osd_request *req)
2161 {
2162 struct ceph_osd_linger_request *lreq = req->r_priv;
2163
2164 mutex_lock(&lreq->lock);
2165 dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
2166 lreq->linger_id, req->r_result);
2167 WARN_ON(!__linger_registered(lreq));
2168 linger_reg_commit_complete(lreq, req->r_result);
2169 lreq->committed = true;
2170
2171 if (!lreq->is_watch) {
2172 struct ceph_osd_data *osd_data =
2173 osd_req_op_data(req, 0, notify, response_data);
2174 void *p = page_address(osd_data->pages[0]);
2175
2176 WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
2177 osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
2178
2179 /* make note of the notify_id */
2180 if (req->r_ops[0].outdata_len >= sizeof(u64)) {
2181 lreq->notify_id = ceph_decode_64(&p);
2182 dout("lreq %p notify_id %llu\n", lreq,
2183 lreq->notify_id);
2184 } else {
2185 dout("lreq %p no notify_id\n", lreq);
2186 }
2187 }
2188
2189 mutex_unlock(&lreq->lock);
2190 linger_put(lreq);
2191 }
2192
2193 static int normalize_watch_error(int err)
2194 {
2195 /*
2196 * Translate ENOENT -> ENOTCONN so that a delete->disconnection
2197 * notification and a failure to reconnect because we raced with
2198 * the delete appear the same to the user.
2199 */
2200 if (err == -ENOENT)
2201 err = -ENOTCONN;
2202
2203 return err;
2204 }
2205
2206 static void linger_reconnect_cb(struct ceph_osd_request *req)
2207 {
2208 struct ceph_osd_linger_request *lreq = req->r_priv;
2209
2210 mutex_lock(&lreq->lock);
2211 dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
2212 lreq, lreq->linger_id, req->r_result, lreq->last_error);
2213 if (req->r_result < 0) {
2214 if (!lreq->last_error) {
2215 lreq->last_error = normalize_watch_error(req->r_result);
2216 queue_watch_error(lreq);
2217 }
2218 }
2219
2220 mutex_unlock(&lreq->lock);
2221 linger_put(lreq);
2222 }
2223
2224 static void send_linger(struct ceph_osd_linger_request *lreq)
2225 {
2226 struct ceph_osd_request *req = lreq->reg_req;
2227 struct ceph_osd_req_op *op = &req->r_ops[0];
2228
2229 verify_osdc_wrlocked(req->r_osdc);
2230 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2231
2232 if (req->r_osd)
2233 cancel_linger_request(req);
2234
2235 request_reinit(req);
2236 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
2237 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
2238 req->r_flags = lreq->t.flags;
2239 req->r_mtime = lreq->mtime;
2240
2241 mutex_lock(&lreq->lock);
2242 if (lreq->is_watch && lreq->committed) {
2243 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2244 op->watch.cookie != lreq->linger_id);
2245 op->watch.op = CEPH_OSD_WATCH_OP_RECONNECT;
2246 op->watch.gen = ++lreq->register_gen;
2247 dout("lreq %p reconnect register_gen %u\n", lreq,
2248 op->watch.gen);
2249 req->r_callback = linger_reconnect_cb;
2250 } else {
2251 if (!lreq->is_watch)
2252 lreq->notify_id = 0;
2253 else
2254 WARN_ON(op->watch.op != CEPH_OSD_WATCH_OP_WATCH);
2255 dout("lreq %p register\n", lreq);
2256 req->r_callback = linger_commit_cb;
2257 }
2258 mutex_unlock(&lreq->lock);
2259
2260 req->r_priv = linger_get(lreq);
2261 req->r_linger = true;
2262
2263 submit_request(req, true);
2264 }
2265
2266 static void linger_ping_cb(struct ceph_osd_request *req)
2267 {
2268 struct ceph_osd_linger_request *lreq = req->r_priv;
2269
2270 mutex_lock(&lreq->lock);
2271 dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
2272 __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
2273 lreq->last_error);
2274 if (lreq->register_gen == req->r_ops[0].watch.gen) {
2275 if (!req->r_result) {
2276 lreq->watch_valid_thru = lreq->ping_sent;
2277 } else if (!lreq->last_error) {
2278 lreq->last_error = normalize_watch_error(req->r_result);
2279 queue_watch_error(lreq);
2280 }
2281 } else {
2282 dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
2283 lreq->register_gen, req->r_ops[0].watch.gen);
2284 }
2285
2286 mutex_unlock(&lreq->lock);
2287 linger_put(lreq);
2288 }
2289
2290 static void send_linger_ping(struct ceph_osd_linger_request *lreq)
2291 {
2292 struct ceph_osd_client *osdc = lreq->osdc;
2293 struct ceph_osd_request *req = lreq->ping_req;
2294 struct ceph_osd_req_op *op = &req->r_ops[0];
2295
2296 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2297 dout("%s PAUSERD\n", __func__);
2298 return;
2299 }
2300
2301 lreq->ping_sent = jiffies;
2302 dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
2303 __func__, lreq, lreq->linger_id, lreq->ping_sent,
2304 lreq->register_gen);
2305
2306 if (req->r_osd)
2307 cancel_linger_request(req);
2308
2309 request_reinit(req);
2310 target_copy(&req->r_t, &lreq->t);
2311
2312 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2313 op->watch.cookie != lreq->linger_id ||
2314 op->watch.op != CEPH_OSD_WATCH_OP_PING);
2315 op->watch.gen = lreq->register_gen;
2316 req->r_callback = linger_ping_cb;
2317 req->r_priv = linger_get(lreq);
2318 req->r_linger = true;
2319
2320 ceph_osdc_get_request(req);
2321 account_request(req);
2322 req->r_tid = atomic64_inc_return(&osdc->last_tid);
2323 link_request(lreq->osd, req);
2324 send_request(req);
2325 }
2326
2327 static void linger_submit(struct ceph_osd_linger_request *lreq)
2328 {
2329 struct ceph_osd_client *osdc = lreq->osdc;
2330 struct ceph_osd *osd;
2331
2332 calc_target(osdc, &lreq->t, &lreq->last_force_resend, false);
2333 osd = lookup_create_osd(osdc, lreq->t.osd, true);
2334 link_linger(osd, lreq);
2335
2336 send_linger(lreq);
2337 }
2338
2339 static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
2340 {
2341 struct ceph_osd_client *osdc = lreq->osdc;
2342 struct ceph_osd_linger_request *lookup_lreq;
2343
2344 verify_osdc_wrlocked(osdc);
2345
2346 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
2347 lreq->linger_id);
2348 if (!lookup_lreq)
2349 return;
2350
2351 WARN_ON(lookup_lreq != lreq);
2352 erase_linger_mc(&osdc->linger_map_checks, lreq);
2353 linger_put(lreq);
2354 }
2355
2356 /*
2357 * @lreq has to be both registered and linked.
2358 */
2359 static void __linger_cancel(struct ceph_osd_linger_request *lreq)
2360 {
2361 if (lreq->is_watch && lreq->ping_req->r_osd)
2362 cancel_linger_request(lreq->ping_req);
2363 if (lreq->reg_req->r_osd)
2364 cancel_linger_request(lreq->reg_req);
2365 cancel_linger_map_check(lreq);
2366 unlink_linger(lreq->osd, lreq);
2367 linger_unregister(lreq);
2368 }
2369
2370 static void linger_cancel(struct ceph_osd_linger_request *lreq)
2371 {
2372 struct ceph_osd_client *osdc = lreq->osdc;
2373
2374 down_write(&osdc->lock);
2375 if (__linger_registered(lreq))
2376 __linger_cancel(lreq);
2377 up_write(&osdc->lock);
2378 }
2379
2380 static void send_linger_map_check(struct ceph_osd_linger_request *lreq);
2381
2382 static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
2383 {
2384 struct ceph_osd_client *osdc = lreq->osdc;
2385 struct ceph_osdmap *map = osdc->osdmap;
2386
2387 verify_osdc_wrlocked(osdc);
2388 WARN_ON(!map->epoch);
2389
2390 if (lreq->register_gen) {
2391 lreq->map_dne_bound = map->epoch;
2392 dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
2393 lreq, lreq->linger_id);
2394 } else {
2395 dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
2396 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
2397 map->epoch);
2398 }
2399
2400 if (lreq->map_dne_bound) {
2401 if (map->epoch >= lreq->map_dne_bound) {
2402 /* we had a new enough map */
2403 pr_info("linger_id %llu pool does not exist\n",
2404 lreq->linger_id);
2405 linger_reg_commit_complete(lreq, -ENOENT);
2406 __linger_cancel(lreq);
2407 }
2408 } else {
2409 send_linger_map_check(lreq);
2410 }
2411 }
2412
2413 static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
2414 {
2415 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2416 struct ceph_osd_linger_request *lreq;
2417 u64 linger_id = greq->private_data;
2418
2419 WARN_ON(greq->result || !greq->u.newest);
2420
2421 down_write(&osdc->lock);
2422 lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
2423 if (!lreq) {
2424 dout("%s linger_id %llu dne\n", __func__, linger_id);
2425 goto out_unlock;
2426 }
2427
2428 dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
2429 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
2430 greq->u.newest);
2431 if (!lreq->map_dne_bound)
2432 lreq->map_dne_bound = greq->u.newest;
2433 erase_linger_mc(&osdc->linger_map_checks, lreq);
2434 check_linger_pool_dne(lreq);
2435
2436 linger_put(lreq);
2437 out_unlock:
2438 up_write(&osdc->lock);
2439 }
2440
2441 static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
2442 {
2443 struct ceph_osd_client *osdc = lreq->osdc;
2444 struct ceph_osd_linger_request *lookup_lreq;
2445 int ret;
2446
2447 verify_osdc_wrlocked(osdc);
2448
2449 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
2450 lreq->linger_id);
2451 if (lookup_lreq) {
2452 WARN_ON(lookup_lreq != lreq);
2453 return;
2454 }
2455
2456 linger_get(lreq);
2457 insert_linger_mc(&osdc->linger_map_checks, lreq);
2458 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
2459 linger_map_check_cb, lreq->linger_id);
2460 WARN_ON(ret);
2461 }
2462
2463 static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
2464 {
2465 int ret;
2466
2467 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2468 ret = wait_for_completion_interruptible(&lreq->reg_commit_wait);
2469 return ret ?: lreq->reg_commit_error;
2470 }
2471
2472 static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq)
2473 {
2474 int ret;
2475
2476 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2477 ret = wait_for_completion_interruptible(&lreq->notify_finish_wait);
2478 return ret ?: lreq->notify_finish_error;
2479 }
2480
2481 /*
2482 * Timeout callback, called every N seconds. When 1 or more OSD
2483 * requests has been active for more than N seconds, we send a keepalive
2484 * (tag + timestamp) to its OSD to ensure any communications channel
2485 * reset is detected.
2486 */
2487 static void handle_timeout(struct work_struct *work)
2488 {
2489 struct ceph_osd_client *osdc =
2490 container_of(work, struct ceph_osd_client, timeout_work.work);
2491 struct ceph_options *opts = osdc->client->options;
2492 unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
2493 LIST_HEAD(slow_osds);
2494 struct rb_node *n, *p;
2495
2496 dout("%s osdc %p\n", __func__, osdc);
2497 down_write(&osdc->lock);
2498
2499 /*
2500 * ping osds that are a bit slow. this ensures that if there
2501 * is a break in the TCP connection we will notice, and reopen
2502 * a connection with that osd (from the fault callback).
2503 */
2504 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2505 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2506 bool found = false;
2507
2508 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
2509 struct ceph_osd_request *req =
2510 rb_entry(p, struct ceph_osd_request, r_node);
2511
2512 if (time_before(req->r_stamp, cutoff)) {
2513 dout(" req %p tid %llu on osd%d is laggy\n",
2514 req, req->r_tid, osd->o_osd);
2515 found = true;
2516 }
2517 }
2518 for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
2519 struct ceph_osd_linger_request *lreq =
2520 rb_entry(p, struct ceph_osd_linger_request, node);
2521
2522 dout(" lreq %p linger_id %llu is served by osd%d\n",
2523 lreq, lreq->linger_id, osd->o_osd);
2524 found = true;
2525
2526 mutex_lock(&lreq->lock);
2527 if (lreq->is_watch && lreq->committed && !lreq->last_error)
2528 send_linger_ping(lreq);
2529 mutex_unlock(&lreq->lock);
2530 }
2531
2532 if (found)
2533 list_move_tail(&osd->o_keepalive_item, &slow_osds);
2534 }
2535
2536 if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
2537 maybe_request_map(osdc);
2538
2539 while (!list_empty(&slow_osds)) {
2540 struct ceph_osd *osd = list_first_entry(&slow_osds,
2541 struct ceph_osd,
2542 o_keepalive_item);
2543 list_del_init(&osd->o_keepalive_item);
2544 ceph_con_keepalive(&osd->o_con);
2545 }
2546
2547 up_write(&osdc->lock);
2548 schedule_delayed_work(&osdc->timeout_work,
2549 osdc->client->options->osd_keepalive_timeout);
2550 }
2551
2552 static void handle_osds_timeout(struct work_struct *work)
2553 {
2554 struct ceph_osd_client *osdc =
2555 container_of(work, struct ceph_osd_client,
2556 osds_timeout_work.work);
2557 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
2558 struct ceph_osd *osd, *nosd;
2559
2560 dout("%s osdc %p\n", __func__, osdc);
2561 down_write(&osdc->lock);
2562 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
2563 if (time_before(jiffies, osd->lru_ttl))
2564 break;
2565
2566 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
2567 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
2568 close_osd(osd);
2569 }
2570
2571 up_write(&osdc->lock);
2572 schedule_delayed_work(&osdc->osds_timeout_work,
2573 round_jiffies_relative(delay));
2574 }
2575
2576 static int ceph_oloc_decode(void **p, void *end,
2577 struct ceph_object_locator *oloc)
2578 {
2579 u8 struct_v, struct_cv;
2580 u32 len;
2581 void *struct_end;
2582 int ret = 0;
2583
2584 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
2585 struct_v = ceph_decode_8(p);
2586 struct_cv = ceph_decode_8(p);
2587 if (struct_v < 3) {
2588 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
2589 struct_v, struct_cv);
2590 goto e_inval;
2591 }
2592 if (struct_cv > 6) {
2593 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
2594 struct_v, struct_cv);
2595 goto e_inval;
2596 }
2597 len = ceph_decode_32(p);
2598 ceph_decode_need(p, end, len, e_inval);
2599 struct_end = *p + len;
2600
2601 oloc->pool = ceph_decode_64(p);
2602 *p += 4; /* skip preferred */
2603
2604 len = ceph_decode_32(p);
2605 if (len > 0) {
2606 pr_warn("ceph_object_locator::key is set\n");
2607 goto e_inval;
2608 }
2609
2610 if (struct_v >= 5) {
2611 bool changed = false;
2612
2613 len = ceph_decode_32(p);
2614 if (len > 0) {
2615 ceph_decode_need(p, end, len, e_inval);
2616 if (!oloc->pool_ns ||
2617 ceph_compare_string(oloc->pool_ns, *p, len))
2618 changed = true;
2619 *p += len;
2620 } else {
2621 if (oloc->pool_ns)
2622 changed = true;
2623 }
2624 if (changed) {
2625 /* redirect changes namespace */
2626 pr_warn("ceph_object_locator::nspace is changed\n");
2627 goto e_inval;
2628 }
2629 }
2630
2631 if (struct_v >= 6) {
2632 s64 hash = ceph_decode_64(p);
2633 if (hash != -1) {
2634 pr_warn("ceph_object_locator::hash is set\n");
2635 goto e_inval;
2636 }
2637 }
2638
2639 /* skip the rest */
2640 *p = struct_end;
2641 out:
2642 return ret;
2643
2644 e_inval:
2645 ret = -EINVAL;
2646 goto out;
2647 }
2648
2649 static int ceph_redirect_decode(void **p, void *end,
2650 struct ceph_request_redirect *redir)
2651 {
2652 u8 struct_v, struct_cv;
2653 u32 len;
2654 void *struct_end;
2655 int ret;
2656
2657 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
2658 struct_v = ceph_decode_8(p);
2659 struct_cv = ceph_decode_8(p);
2660 if (struct_cv > 1) {
2661 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
2662 struct_v, struct_cv);
2663 goto e_inval;
2664 }
2665 len = ceph_decode_32(p);
2666 ceph_decode_need(p, end, len, e_inval);
2667 struct_end = *p + len;
2668
2669 ret = ceph_oloc_decode(p, end, &redir->oloc);
2670 if (ret)
2671 goto out;
2672
2673 len = ceph_decode_32(p);
2674 if (len > 0) {
2675 pr_warn("ceph_request_redirect::object_name is set\n");
2676 goto e_inval;
2677 }
2678
2679 len = ceph_decode_32(p);
2680 *p += len; /* skip osd_instructions */
2681
2682 /* skip the rest */
2683 *p = struct_end;
2684 out:
2685 return ret;
2686
2687 e_inval:
2688 ret = -EINVAL;
2689 goto out;
2690 }
2691
2692 struct MOSDOpReply {
2693 struct ceph_pg pgid;
2694 u64 flags;
2695 int result;
2696 u32 epoch;
2697 int num_ops;
2698 u32 outdata_len[CEPH_OSD_MAX_OPS];
2699 s32 rval[CEPH_OSD_MAX_OPS];
2700 int retry_attempt;
2701 struct ceph_eversion replay_version;
2702 u64 user_version;
2703 struct ceph_request_redirect redirect;
2704 };
2705
2706 static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
2707 {
2708 void *p = msg->front.iov_base;
2709 void *const end = p + msg->front.iov_len;
2710 u16 version = le16_to_cpu(msg->hdr.version);
2711 struct ceph_eversion bad_replay_version;
2712 u8 decode_redir;
2713 u32 len;
2714 int ret;
2715 int i;
2716
2717 ceph_decode_32_safe(&p, end, len, e_inval);
2718 ceph_decode_need(&p, end, len, e_inval);
2719 p += len; /* skip oid */
2720
2721 ret = ceph_decode_pgid(&p, end, &m->pgid);
2722 if (ret)
2723 return ret;
2724
2725 ceph_decode_64_safe(&p, end, m->flags, e_inval);
2726 ceph_decode_32_safe(&p, end, m->result, e_inval);
2727 ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
2728 memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
2729 p += sizeof(bad_replay_version);
2730 ceph_decode_32_safe(&p, end, m->epoch, e_inval);
2731
2732 ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
2733 if (m->num_ops > ARRAY_SIZE(m->outdata_len))
2734 goto e_inval;
2735
2736 ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
2737 e_inval);
2738 for (i = 0; i < m->num_ops; i++) {
2739 struct ceph_osd_op *op = p;
2740
2741 m->outdata_len[i] = le32_to_cpu(op->payload_len);
2742 p += sizeof(*op);
2743 }
2744
2745 ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
2746 for (i = 0; i < m->num_ops; i++)
2747 ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
2748
2749 if (version >= 5) {
2750 ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
2751 memcpy(&m->replay_version, p, sizeof(m->replay_version));
2752 p += sizeof(m->replay_version);
2753 ceph_decode_64_safe(&p, end, m->user_version, e_inval);
2754 } else {
2755 m->replay_version = bad_replay_version; /* struct */
2756 m->user_version = le64_to_cpu(m->replay_version.version);
2757 }
2758
2759 if (version >= 6) {
2760 if (version >= 7)
2761 ceph_decode_8_safe(&p, end, decode_redir, e_inval);
2762 else
2763 decode_redir = 1;
2764 } else {
2765 decode_redir = 0;
2766 }
2767
2768 if (decode_redir) {
2769 ret = ceph_redirect_decode(&p, end, &m->redirect);
2770 if (ret)
2771 return ret;
2772 } else {
2773 ceph_oloc_init(&m->redirect.oloc);
2774 }
2775
2776 return 0;
2777
2778 e_inval:
2779 return -EINVAL;
2780 }
2781
2782 /*
2783 * We are done with @req if
2784 * - @m is a safe reply, or
2785 * - @m is an unsafe reply and we didn't want a safe one
2786 */
2787 static bool done_request(const struct ceph_osd_request *req,
2788 const struct MOSDOpReply *m)
2789 {
2790 return (m->result < 0 ||
2791 (m->flags & CEPH_OSD_FLAG_ONDISK) ||
2792 !(req->r_flags & CEPH_OSD_FLAG_ONDISK));
2793 }
2794
2795 /*
2796 * handle osd op reply. either call the callback if it is specified,
2797 * or do the completion to wake up the waiting thread.
2798 *
2799 * ->r_unsafe_callback is set? yes no
2800 *
2801 * first reply is OK (needed r_cb/r_completion, r_cb/r_completion,
2802 * any or needed/got safe) r_safe_completion r_safe_completion
2803 *
2804 * first reply is unsafe r_unsafe_cb(true) (nothing)
2805 *
2806 * when we get the safe reply r_unsafe_cb(false), r_cb/r_completion,
2807 * r_safe_completion r_safe_completion
2808 */
2809 static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
2810 {
2811 struct ceph_osd_client *osdc = osd->o_osdc;
2812 struct ceph_osd_request *req;
2813 struct MOSDOpReply m;
2814 u64 tid = le64_to_cpu(msg->hdr.tid);
2815 u32 data_len = 0;
2816 bool already_acked;
2817 int ret;
2818 int i;
2819
2820 dout("%s msg %p tid %llu\n", __func__, msg, tid);
2821
2822 down_read(&osdc->lock);
2823 if (!osd_registered(osd)) {
2824 dout("%s osd%d unknown\n", __func__, osd->o_osd);
2825 goto out_unlock_osdc;
2826 }
2827 WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
2828
2829 mutex_lock(&osd->lock);
2830 req = lookup_request(&osd->o_requests, tid);
2831 if (!req) {
2832 dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
2833 goto out_unlock_session;
2834 }
2835
2836 m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
2837 ret = decode_MOSDOpReply(msg, &m);
2838 m.redirect.oloc.pool_ns = NULL;
2839 if (ret) {
2840 pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
2841 req->r_tid, ret);
2842 ceph_msg_dump(msg);
2843 goto fail_request;
2844 }
2845 dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
2846 __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
2847 m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
2848 le64_to_cpu(m.replay_version.version), m.user_version);
2849
2850 if (m.retry_attempt >= 0) {
2851 if (m.retry_attempt != req->r_attempts - 1) {
2852 dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
2853 req, req->r_tid, m.retry_attempt,
2854 req->r_attempts - 1);
2855 goto out_unlock_session;
2856 }
2857 } else {
2858 WARN_ON(1); /* MOSDOpReply v4 is assumed */
2859 }
2860
2861 if (!ceph_oloc_empty(&m.redirect.oloc)) {
2862 dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
2863 m.redirect.oloc.pool);
2864 unlink_request(osd, req);
2865 mutex_unlock(&osd->lock);
2866
2867 /*
2868 * Not ceph_oloc_copy() - changing pool_ns is not
2869 * supported.
2870 */
2871 req->r_t.target_oloc.pool = m.redirect.oloc.pool;
2872 req->r_flags |= CEPH_OSD_FLAG_REDIRECTED;
2873 req->r_tid = 0;
2874 __submit_request(req, false);
2875 goto out_unlock_osdc;
2876 }
2877
2878 if (m.num_ops != req->r_num_ops) {
2879 pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
2880 req->r_num_ops, req->r_tid);
2881 goto fail_request;
2882 }
2883 for (i = 0; i < req->r_num_ops; i++) {
2884 dout(" req %p tid %llu op %d rval %d len %u\n", req,
2885 req->r_tid, i, m.rval[i], m.outdata_len[i]);
2886 req->r_ops[i].rval = m.rval[i];
2887 req->r_ops[i].outdata_len = m.outdata_len[i];
2888 data_len += m.outdata_len[i];
2889 }
2890 if (data_len != le32_to_cpu(msg->hdr.data_len)) {
2891 pr_err("sum of lens %u != %u for tid %llu\n", data_len,
2892 le32_to_cpu(msg->hdr.data_len), req->r_tid);
2893 goto fail_request;
2894 }
2895 dout("%s req %p tid %llu acked %d result %d data_len %u\n", __func__,
2896 req, req->r_tid, req->r_got_reply, m.result, data_len);
2897
2898 already_acked = req->r_got_reply;
2899 if (!already_acked) {
2900 req->r_result = m.result ?: data_len;
2901 req->r_replay_version = m.replay_version; /* struct */
2902 req->r_got_reply = true;
2903 } else if (!(m.flags & CEPH_OSD_FLAG_ONDISK)) {
2904 dout("req %p tid %llu dup ack\n", req, req->r_tid);
2905 goto out_unlock_session;
2906 }
2907
2908 if (done_request(req, &m)) {
2909 __finish_request(req);
2910 if (req->r_linger) {
2911 WARN_ON(req->r_unsafe_callback);
2912 dout("req %p tid %llu cb (locked)\n", req, req->r_tid);
2913 __complete_request(req);
2914 }
2915 }
2916
2917 mutex_unlock(&osd->lock);
2918 up_read(&osdc->lock);
2919
2920 if (done_request(req, &m)) {
2921 if (already_acked && req->r_unsafe_callback) {
2922 dout("req %p tid %llu safe-cb\n", req, req->r_tid);
2923 req->r_unsafe_callback(req, false);
2924 } else if (!req->r_linger) {
2925 dout("req %p tid %llu cb\n", req, req->r_tid);
2926 __complete_request(req);
2927 }
2928 if (m.flags & CEPH_OSD_FLAG_ONDISK)
2929 complete_all(&req->r_safe_completion);
2930 ceph_osdc_put_request(req);
2931 } else {
2932 if (req->r_unsafe_callback) {
2933 dout("req %p tid %llu unsafe-cb\n", req, req->r_tid);
2934 req->r_unsafe_callback(req, true);
2935 } else {
2936 WARN_ON(1);
2937 }
2938 }
2939
2940 return;
2941
2942 fail_request:
2943 complete_request(req, -EIO);
2944 out_unlock_session:
2945 mutex_unlock(&osd->lock);
2946 out_unlock_osdc:
2947 up_read(&osdc->lock);
2948 }
2949
2950 static void set_pool_was_full(struct ceph_osd_client *osdc)
2951 {
2952 struct rb_node *n;
2953
2954 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
2955 struct ceph_pg_pool_info *pi =
2956 rb_entry(n, struct ceph_pg_pool_info, node);
2957
2958 pi->was_full = __pool_full(pi);
2959 }
2960 }
2961
2962 static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
2963 {
2964 struct ceph_pg_pool_info *pi;
2965
2966 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
2967 if (!pi)
2968 return false;
2969
2970 return pi->was_full && !__pool_full(pi);
2971 }
2972
2973 static enum calc_target_result
2974 recalc_linger_target(struct ceph_osd_linger_request *lreq)
2975 {
2976 struct ceph_osd_client *osdc = lreq->osdc;
2977 enum calc_target_result ct_res;
2978
2979 ct_res = calc_target(osdc, &lreq->t, &lreq->last_force_resend, true);
2980 if (ct_res == CALC_TARGET_NEED_RESEND) {
2981 struct ceph_osd *osd;
2982
2983 osd = lookup_create_osd(osdc, lreq->t.osd, true);
2984 if (osd != lreq->osd) {
2985 unlink_linger(lreq->osd, lreq);
2986 link_linger(osd, lreq);
2987 }
2988 }
2989
2990 return ct_res;
2991 }
2992
2993 /*
2994 * Requeue requests whose mapping to an OSD has changed.
2995 */
2996 static void scan_requests(struct ceph_osd *osd,
2997 bool force_resend,
2998 bool cleared_full,
2999 bool check_pool_cleared_full,
3000 struct rb_root *need_resend,
3001 struct list_head *need_resend_linger)
3002 {
3003 struct ceph_osd_client *osdc = osd->o_osdc;
3004 struct rb_node *n;
3005 bool force_resend_writes;
3006
3007 for (n = rb_first(&osd->o_linger_requests); n; ) {
3008 struct ceph_osd_linger_request *lreq =
3009 rb_entry(n, struct ceph_osd_linger_request, node);
3010 enum calc_target_result ct_res;
3011
3012 n = rb_next(n); /* recalc_linger_target() */
3013
3014 dout("%s lreq %p linger_id %llu\n", __func__, lreq,
3015 lreq->linger_id);
3016 ct_res = recalc_linger_target(lreq);
3017 switch (ct_res) {
3018 case CALC_TARGET_NO_ACTION:
3019 force_resend_writes = cleared_full ||
3020 (check_pool_cleared_full &&
3021 pool_cleared_full(osdc, lreq->t.base_oloc.pool));
3022 if (!force_resend && !force_resend_writes)
3023 break;
3024
3025 /* fall through */
3026 case CALC_TARGET_NEED_RESEND:
3027 cancel_linger_map_check(lreq);
3028 /*
3029 * scan_requests() for the previous epoch(s)
3030 * may have already added it to the list, since
3031 * it's not unlinked here.
3032 */
3033 if (list_empty(&lreq->scan_item))
3034 list_add_tail(&lreq->scan_item, need_resend_linger);
3035 break;
3036 case CALC_TARGET_POOL_DNE:
3037 check_linger_pool_dne(lreq);
3038 break;
3039 }
3040 }
3041
3042 for (n = rb_first(&osd->o_requests); n; ) {
3043 struct ceph_osd_request *req =
3044 rb_entry(n, struct ceph_osd_request, r_node);
3045 enum calc_target_result ct_res;
3046
3047 n = rb_next(n); /* unlink_request(), check_pool_dne() */
3048
3049 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3050 ct_res = calc_target(osdc, &req->r_t,
3051 &req->r_last_force_resend, false);
3052 switch (ct_res) {
3053 case CALC_TARGET_NO_ACTION:
3054 force_resend_writes = cleared_full ||
3055 (check_pool_cleared_full &&
3056 pool_cleared_full(osdc, req->r_t.base_oloc.pool));
3057 if (!force_resend &&
3058 (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
3059 !force_resend_writes))
3060 break;
3061
3062 /* fall through */
3063 case CALC_TARGET_NEED_RESEND:
3064 cancel_map_check(req);
3065 unlink_request(osd, req);
3066 insert_request(need_resend, req);
3067 break;
3068 case CALC_TARGET_POOL_DNE:
3069 check_pool_dne(req);
3070 break;
3071 }
3072 }
3073 }
3074
3075 static int handle_one_map(struct ceph_osd_client *osdc,
3076 void *p, void *end, bool incremental,
3077 struct rb_root *need_resend,
3078 struct list_head *need_resend_linger)
3079 {
3080 struct ceph_osdmap *newmap;
3081 struct rb_node *n;
3082 bool skipped_map = false;
3083 bool was_full;
3084
3085 was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3086 set_pool_was_full(osdc);
3087
3088 if (incremental)
3089 newmap = osdmap_apply_incremental(&p, end, osdc->osdmap);
3090 else
3091 newmap = ceph_osdmap_decode(&p, end);
3092 if (IS_ERR(newmap))
3093 return PTR_ERR(newmap);
3094
3095 if (newmap != osdc->osdmap) {
3096 /*
3097 * Preserve ->was_full before destroying the old map.
3098 * For pools that weren't in the old map, ->was_full
3099 * should be false.
3100 */
3101 for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
3102 struct ceph_pg_pool_info *pi =
3103 rb_entry(n, struct ceph_pg_pool_info, node);
3104 struct ceph_pg_pool_info *old_pi;
3105
3106 old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
3107 if (old_pi)
3108 pi->was_full = old_pi->was_full;
3109 else
3110 WARN_ON(pi->was_full);
3111 }
3112
3113 if (osdc->osdmap->epoch &&
3114 osdc->osdmap->epoch + 1 < newmap->epoch) {
3115 WARN_ON(incremental);
3116 skipped_map = true;
3117 }
3118
3119 ceph_osdmap_destroy(osdc->osdmap);
3120 osdc->osdmap = newmap;
3121 }
3122
3123 was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3124 scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
3125 need_resend, need_resend_linger);
3126
3127 for (n = rb_first(&osdc->osds); n; ) {
3128 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3129
3130 n = rb_next(n); /* close_osd() */
3131
3132 scan_requests(osd, skipped_map, was_full, true, need_resend,
3133 need_resend_linger);
3134 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
3135 memcmp(&osd->o_con.peer_addr,
3136 ceph_osd_addr(osdc->osdmap, osd->o_osd),
3137 sizeof(struct ceph_entity_addr)))
3138 close_osd(osd);
3139 }
3140
3141 return 0;
3142 }
3143
3144 static void kick_requests(struct ceph_osd_client *osdc,
3145 struct rb_root *need_resend,
3146 struct list_head *need_resend_linger)
3147 {
3148 struct ceph_osd_linger_request *lreq, *nlreq;
3149 struct rb_node *n;
3150
3151 for (n = rb_first(need_resend); n; ) {
3152 struct ceph_osd_request *req =
3153 rb_entry(n, struct ceph_osd_request, r_node);
3154 struct ceph_osd *osd;
3155
3156 n = rb_next(n);
3157 erase_request(need_resend, req); /* before link_request() */
3158
3159 WARN_ON(req->r_osd);
3160 calc_target(osdc, &req->r_t, NULL, false);
3161 osd = lookup_create_osd(osdc, req->r_t.osd, true);
3162 link_request(osd, req);
3163 if (!req->r_linger) {
3164 if (!osd_homeless(osd) && !req->r_t.paused)
3165 send_request(req);
3166 } else {
3167 cancel_linger_request(req);
3168 }
3169 }
3170
3171 list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
3172 if (!osd_homeless(lreq->osd))
3173 send_linger(lreq);
3174
3175 list_del_init(&lreq->scan_item);
3176 }
3177 }
3178
3179 /*
3180 * Process updated osd map.
3181 *
3182 * The message contains any number of incremental and full maps, normally
3183 * indicating some sort of topology change in the cluster. Kick requests
3184 * off to different OSDs as needed.
3185 */
3186 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
3187 {
3188 void *p = msg->front.iov_base;
3189 void *const end = p + msg->front.iov_len;
3190 u32 nr_maps, maplen;
3191 u32 epoch;
3192 struct ceph_fsid fsid;
3193 struct rb_root need_resend = RB_ROOT;
3194 LIST_HEAD(need_resend_linger);
3195 bool handled_incremental = false;
3196 bool was_pauserd, was_pausewr;
3197 bool pauserd, pausewr;
3198 int err;
3199
3200 dout("%s have %u\n", __func__, osdc->osdmap->epoch);
3201 down_write(&osdc->lock);
3202
3203 /* verify fsid */
3204 ceph_decode_need(&p, end, sizeof(fsid), bad);
3205 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3206 if (ceph_check_fsid(osdc->client, &fsid) < 0)
3207 goto bad;
3208
3209 was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3210 was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3211 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3212 have_pool_full(osdc);
3213
3214 /* incremental maps */
3215 ceph_decode_32_safe(&p, end, nr_maps, bad);
3216 dout(" %d inc maps\n", nr_maps);
3217 while (nr_maps > 0) {
3218 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3219 epoch = ceph_decode_32(&p);
3220 maplen = ceph_decode_32(&p);
3221 ceph_decode_need(&p, end, maplen, bad);
3222 if (osdc->osdmap->epoch &&
3223 osdc->osdmap->epoch + 1 == epoch) {
3224 dout("applying incremental map %u len %d\n",
3225 epoch, maplen);
3226 err = handle_one_map(osdc, p, p + maplen, true,
3227 &need_resend, &need_resend_linger);
3228 if (err)
3229 goto bad;
3230 handled_incremental = true;
3231 } else {
3232 dout("ignoring incremental map %u len %d\n",
3233 epoch, maplen);
3234 }
3235 p += maplen;
3236 nr_maps--;
3237 }
3238 if (handled_incremental)
3239 goto done;
3240
3241 /* full maps */
3242 ceph_decode_32_safe(&p, end, nr_maps, bad);
3243 dout(" %d full maps\n", nr_maps);
3244 while (nr_maps) {
3245 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3246 epoch = ceph_decode_32(&p);
3247 maplen = ceph_decode_32(&p);
3248 ceph_decode_need(&p, end, maplen, bad);
3249 if (nr_maps > 1) {
3250 dout("skipping non-latest full map %u len %d\n",
3251 epoch, maplen);
3252 } else if (osdc->osdmap->epoch >= epoch) {
3253 dout("skipping full map %u len %d, "
3254 "older than our %u\n", epoch, maplen,
3255 osdc->osdmap->epoch);
3256 } else {
3257 dout("taking full map %u len %d\n", epoch, maplen);
3258 err = handle_one_map(osdc, p, p + maplen, false,
3259 &need_resend, &need_resend_linger);
3260 if (err)
3261 goto bad;
3262 }
3263 p += maplen;
3264 nr_maps--;
3265 }
3266
3267 done:
3268 /*
3269 * subscribe to subsequent osdmap updates if full to ensure
3270 * we find out when we are no longer full and stop returning
3271 * ENOSPC.
3272 */
3273 pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3274 pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3275 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3276 have_pool_full(osdc);
3277 if (was_pauserd || was_pausewr || pauserd || pausewr)
3278 maybe_request_map(osdc);
3279
3280 kick_requests(osdc, &need_resend, &need_resend_linger);
3281
3282 ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
3283 osdc->osdmap->epoch);
3284 up_write(&osdc->lock);
3285 wake_up_all(&osdc->client->auth_wq);
3286 return;
3287
3288 bad:
3289 pr_err("osdc handle_map corrupt msg\n");
3290 ceph_msg_dump(msg);
3291 up_write(&osdc->lock);
3292 }
3293
3294 /*
3295 * Resubmit requests pending on the given osd.
3296 */
3297 static void kick_osd_requests(struct ceph_osd *osd)
3298 {
3299 struct rb_node *n;
3300
3301 for (n = rb_first(&osd->o_requests); n; ) {
3302 struct ceph_osd_request *req =
3303 rb_entry(n, struct ceph_osd_request, r_node);
3304
3305 n = rb_next(n); /* cancel_linger_request() */
3306
3307 if (!req->r_linger) {
3308 if (!req->r_t.paused)
3309 send_request(req);
3310 } else {
3311 cancel_linger_request(req);
3312 }
3313 }
3314 for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
3315 struct ceph_osd_linger_request *lreq =
3316 rb_entry(n, struct ceph_osd_linger_request, node);
3317
3318 send_linger(lreq);
3319 }
3320 }
3321
3322 /*
3323 * If the osd connection drops, we need to resubmit all requests.
3324 */
3325 static void osd_fault(struct ceph_connection *con)
3326 {
3327 struct ceph_osd *osd = con->private;
3328 struct ceph_osd_client *osdc = osd->o_osdc;
3329
3330 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
3331
3332 down_write(&osdc->lock);
3333 if (!osd_registered(osd)) {
3334 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3335 goto out_unlock;
3336 }
3337
3338 if (!reopen_osd(osd))
3339 kick_osd_requests(osd);
3340 maybe_request_map(osdc);
3341
3342 out_unlock:
3343 up_write(&osdc->lock);
3344 }
3345
3346 /*
3347 * Process osd watch notifications
3348 */
3349 static void handle_watch_notify(struct ceph_osd_client *osdc,
3350 struct ceph_msg *msg)
3351 {
3352 void *p = msg->front.iov_base;
3353 void *const end = p + msg->front.iov_len;
3354 struct ceph_osd_linger_request *lreq;
3355 struct linger_work *lwork;
3356 u8 proto_ver, opcode;
3357 u64 cookie, notify_id;
3358 u64 notifier_id = 0;
3359 s32 return_code = 0;
3360 void *payload = NULL;
3361 u32 payload_len = 0;
3362
3363 ceph_decode_8_safe(&p, end, proto_ver, bad);
3364 ceph_decode_8_safe(&p, end, opcode, bad);
3365 ceph_decode_64_safe(&p, end, cookie, bad);
3366 p += 8; /* skip ver */
3367 ceph_decode_64_safe(&p, end, notify_id, bad);
3368
3369 if (proto_ver >= 1) {
3370 ceph_decode_32_safe(&p, end, payload_len, bad);
3371 ceph_decode_need(&p, end, payload_len, bad);
3372 payload = p;
3373 p += payload_len;
3374 }
3375
3376 if (le16_to_cpu(msg->hdr.version) >= 2)
3377 ceph_decode_32_safe(&p, end, return_code, bad);
3378
3379 if (le16_to_cpu(msg->hdr.version) >= 3)
3380 ceph_decode_64_safe(&p, end, notifier_id, bad);
3381
3382 down_read(&osdc->lock);
3383 lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
3384 if (!lreq) {
3385 dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
3386 cookie);
3387 goto out_unlock_osdc;
3388 }
3389
3390 mutex_lock(&lreq->lock);
3391 dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
3392 opcode, cookie, lreq, lreq->is_watch);
3393 if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
3394 if (!lreq->last_error) {
3395 lreq->last_error = -ENOTCONN;
3396 queue_watch_error(lreq);
3397 }
3398 } else if (!lreq->is_watch) {
3399 /* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
3400 if (lreq->notify_id && lreq->notify_id != notify_id) {
3401 dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
3402 lreq->notify_id, notify_id);
3403 } else if (!completion_done(&lreq->notify_finish_wait)) {
3404 struct ceph_msg_data *data =
3405 list_first_entry_or_null(&msg->data,
3406 struct ceph_msg_data,
3407 links);
3408
3409 if (data) {
3410 if (lreq->preply_pages) {
3411 WARN_ON(data->type !=
3412 CEPH_MSG_DATA_PAGES);
3413 *lreq->preply_pages = data->pages;
3414 *lreq->preply_len = data->length;
3415 } else {
3416 ceph_release_page_vector(data->pages,
3417 calc_pages_for(0, data->length));
3418 }
3419 }
3420 lreq->notify_finish_error = return_code;
3421 complete_all(&lreq->notify_finish_wait);
3422 }
3423 } else {
3424 /* CEPH_WATCH_EVENT_NOTIFY */
3425 lwork = lwork_alloc(lreq, do_watch_notify);
3426 if (!lwork) {
3427 pr_err("failed to allocate notify-lwork\n");
3428 goto out_unlock_lreq;
3429 }
3430
3431 lwork->notify.notify_id = notify_id;
3432 lwork->notify.notifier_id = notifier_id;
3433 lwork->notify.payload = payload;
3434 lwork->notify.payload_len = payload_len;
3435 lwork->notify.msg = ceph_msg_get(msg);
3436 lwork_queue(lwork);
3437 }
3438
3439 out_unlock_lreq:
3440 mutex_unlock(&lreq->lock);
3441 out_unlock_osdc:
3442 up_read(&osdc->lock);
3443 return;
3444
3445 bad:
3446 pr_err("osdc handle_watch_notify corrupt msg\n");
3447 }
3448
3449 /*
3450 * Register request, send initial attempt.
3451 */
3452 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
3453 struct ceph_osd_request *req,
3454 bool nofail)
3455 {
3456 down_read(&osdc->lock);
3457 submit_request(req, false);
3458 up_read(&osdc->lock);
3459
3460 return 0;
3461 }
3462 EXPORT_SYMBOL(ceph_osdc_start_request);
3463
3464 /*
3465 * Unregister a registered request. The request is not completed (i.e.
3466 * no callbacks or wakeups) - higher layers are supposed to know what
3467 * they are canceling.
3468 */
3469 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
3470 {
3471 struct ceph_osd_client *osdc = req->r_osdc;
3472
3473 down_write(&osdc->lock);
3474 if (req->r_osd)
3475 cancel_request(req);
3476 up_write(&osdc->lock);
3477 }
3478 EXPORT_SYMBOL(ceph_osdc_cancel_request);
3479
3480 /*
3481 * @timeout: in jiffies, 0 means "wait forever"
3482 */
3483 static int wait_request_timeout(struct ceph_osd_request *req,
3484 unsigned long timeout)
3485 {
3486 long left;
3487
3488 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3489 left = wait_for_completion_killable_timeout(&req->r_completion,
3490 ceph_timeout_jiffies(timeout));
3491 if (left <= 0) {
3492 left = left ?: -ETIMEDOUT;
3493 ceph_osdc_cancel_request(req);
3494
3495 /* kludge - need to to wake ceph_osdc_sync() */
3496 complete_all(&req->r_safe_completion);
3497 } else {
3498 left = req->r_result; /* completed */
3499 }
3500
3501 return left;
3502 }
3503
3504 /*
3505 * wait for a request to complete
3506 */
3507 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
3508 struct ceph_osd_request *req)
3509 {
3510 return wait_request_timeout(req, 0);
3511 }
3512 EXPORT_SYMBOL(ceph_osdc_wait_request);
3513
3514 /*
3515 * sync - wait for all in-flight requests to flush. avoid starvation.
3516 */
3517 void ceph_osdc_sync(struct ceph_osd_client *osdc)
3518 {
3519 struct rb_node *n, *p;
3520 u64 last_tid = atomic64_read(&osdc->last_tid);
3521
3522 again:
3523 down_read(&osdc->lock);
3524 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
3525 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3526
3527 mutex_lock(&osd->lock);
3528 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
3529 struct ceph_osd_request *req =
3530 rb_entry(p, struct ceph_osd_request, r_node);
3531
3532 if (req->r_tid > last_tid)
3533 break;
3534
3535 if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
3536 continue;
3537
3538 ceph_osdc_get_request(req);
3539 mutex_unlock(&osd->lock);
3540 up_read(&osdc->lock);
3541 dout("%s waiting on req %p tid %llu last_tid %llu\n",
3542 __func__, req, req->r_tid, last_tid);
3543 wait_for_completion(&req->r_safe_completion);
3544 ceph_osdc_put_request(req);
3545 goto again;
3546 }
3547
3548 mutex_unlock(&osd->lock);
3549 }
3550
3551 up_read(&osdc->lock);
3552 dout("%s done last_tid %llu\n", __func__, last_tid);
3553 }
3554 EXPORT_SYMBOL(ceph_osdc_sync);
3555
3556 static struct ceph_osd_request *
3557 alloc_linger_request(struct ceph_osd_linger_request *lreq)
3558 {
3559 struct ceph_osd_request *req;
3560
3561 req = ceph_osdc_alloc_request(lreq->osdc, NULL, 1, false, GFP_NOIO);
3562 if (!req)
3563 return NULL;
3564
3565 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
3566 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
3567
3568 if (ceph_osdc_alloc_messages(req, GFP_NOIO)) {
3569 ceph_osdc_put_request(req);
3570 return NULL;
3571 }
3572
3573 return req;
3574 }
3575
3576 /*
3577 * Returns a handle, caller owns a ref.
3578 */
3579 struct ceph_osd_linger_request *
3580 ceph_osdc_watch(struct ceph_osd_client *osdc,
3581 struct ceph_object_id *oid,
3582 struct ceph_object_locator *oloc,
3583 rados_watchcb2_t wcb,
3584 rados_watcherrcb_t errcb,
3585 void *data)
3586 {
3587 struct ceph_osd_linger_request *lreq;
3588 int ret;
3589
3590 lreq = linger_alloc(osdc);
3591 if (!lreq)
3592 return ERR_PTR(-ENOMEM);
3593
3594 lreq->is_watch = true;
3595 lreq->wcb = wcb;
3596 lreq->errcb = errcb;
3597 lreq->data = data;
3598 lreq->watch_valid_thru = jiffies;
3599
3600 ceph_oid_copy(&lreq->t.base_oid, oid);
3601 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
3602 lreq->t.flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
3603 lreq->mtime = CURRENT_TIME;
3604
3605 lreq->reg_req = alloc_linger_request(lreq);
3606 if (!lreq->reg_req) {
3607 ret = -ENOMEM;
3608 goto err_put_lreq;
3609 }
3610
3611 lreq->ping_req = alloc_linger_request(lreq);
3612 if (!lreq->ping_req) {
3613 ret = -ENOMEM;
3614 goto err_put_lreq;
3615 }
3616
3617 down_write(&osdc->lock);
3618 linger_register(lreq); /* before osd_req_op_* */
3619 osd_req_op_watch_init(lreq->reg_req, 0, lreq->linger_id,
3620 CEPH_OSD_WATCH_OP_WATCH);
3621 osd_req_op_watch_init(lreq->ping_req, 0, lreq->linger_id,
3622 CEPH_OSD_WATCH_OP_PING);
3623 linger_submit(lreq);
3624 up_write(&osdc->lock);
3625
3626 ret = linger_reg_commit_wait(lreq);
3627 if (ret) {
3628 linger_cancel(lreq);
3629 goto err_put_lreq;
3630 }
3631
3632 return lreq;
3633
3634 err_put_lreq:
3635 linger_put(lreq);
3636 return ERR_PTR(ret);
3637 }
3638 EXPORT_SYMBOL(ceph_osdc_watch);
3639
3640 /*
3641 * Releases a ref.
3642 *
3643 * Times out after mount_timeout to preserve rbd unmap behaviour
3644 * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
3645 * with mount_timeout").
3646 */
3647 int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
3648 struct ceph_osd_linger_request *lreq)
3649 {
3650 struct ceph_options *opts = osdc->client->options;
3651 struct ceph_osd_request *req;
3652 int ret;
3653
3654 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
3655 if (!req)
3656 return -ENOMEM;
3657
3658 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
3659 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
3660 req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
3661 req->r_mtime = CURRENT_TIME;
3662 osd_req_op_watch_init(req, 0, lreq->linger_id,
3663 CEPH_OSD_WATCH_OP_UNWATCH);
3664
3665 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
3666 if (ret)
3667 goto out_put_req;
3668
3669 ceph_osdc_start_request(osdc, req, false);
3670 linger_cancel(lreq);
3671 linger_put(lreq);
3672 ret = wait_request_timeout(req, opts->mount_timeout);
3673
3674 out_put_req:
3675 ceph_osdc_put_request(req);
3676 return ret;
3677 }
3678 EXPORT_SYMBOL(ceph_osdc_unwatch);
3679
3680 static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
3681 u64 notify_id, u64 cookie, void *payload,
3682 size_t payload_len)
3683 {
3684 struct ceph_osd_req_op *op;
3685 struct ceph_pagelist *pl;
3686 int ret;
3687
3688 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
3689
3690 pl = kmalloc(sizeof(*pl), GFP_NOIO);
3691 if (!pl)
3692 return -ENOMEM;
3693
3694 ceph_pagelist_init(pl);
3695 ret = ceph_pagelist_encode_64(pl, notify_id);
3696 ret |= ceph_pagelist_encode_64(pl, cookie);
3697 if (payload) {
3698 ret |= ceph_pagelist_encode_32(pl, payload_len);
3699 ret |= ceph_pagelist_append(pl, payload, payload_len);
3700 } else {
3701 ret |= ceph_pagelist_encode_32(pl, 0);
3702 }
3703 if (ret) {
3704 ceph_pagelist_release(pl);
3705 return -ENOMEM;
3706 }
3707
3708 ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
3709 op->indata_len = pl->length;
3710 return 0;
3711 }
3712
3713 int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
3714 struct ceph_object_id *oid,
3715 struct ceph_object_locator *oloc,
3716 u64 notify_id,
3717 u64 cookie,
3718 void *payload,
3719 size_t payload_len)
3720 {
3721 struct ceph_osd_request *req;
3722 int ret;
3723
3724 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
3725 if (!req)
3726 return -ENOMEM;
3727
3728 ceph_oid_copy(&req->r_base_oid, oid);
3729 ceph_oloc_copy(&req->r_base_oloc, oloc);
3730 req->r_flags = CEPH_OSD_FLAG_READ;
3731
3732 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
3733 if (ret)
3734 goto out_put_req;
3735
3736 ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
3737 payload_len);
3738 if (ret)
3739 goto out_put_req;
3740
3741 ceph_osdc_start_request(osdc, req, false);
3742 ret = ceph_osdc_wait_request(osdc, req);
3743
3744 out_put_req:
3745 ceph_osdc_put_request(req);
3746 return ret;
3747 }
3748 EXPORT_SYMBOL(ceph_osdc_notify_ack);
3749
3750 static int osd_req_op_notify_init(struct ceph_osd_request *req, int which,
3751 u64 cookie, u32 prot_ver, u32 timeout,
3752 void *payload, size_t payload_len)
3753 {
3754 struct ceph_osd_req_op *op;
3755 struct ceph_pagelist *pl;
3756 int ret;
3757
3758 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
3759 op->notify.cookie = cookie;
3760
3761 pl = kmalloc(sizeof(*pl), GFP_NOIO);
3762 if (!pl)
3763 return -ENOMEM;
3764
3765 ceph_pagelist_init(pl);
3766 ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
3767 ret |= ceph_pagelist_encode_32(pl, timeout);
3768 ret |= ceph_pagelist_encode_32(pl, payload_len);
3769 ret |= ceph_pagelist_append(pl, payload, payload_len);
3770 if (ret) {
3771 ceph_pagelist_release(pl);
3772 return -ENOMEM;
3773 }
3774
3775 ceph_osd_data_pagelist_init(&op->notify.request_data, pl);
3776 op->indata_len = pl->length;
3777 return 0;
3778 }
3779
3780 /*
3781 * @timeout: in seconds
3782 *
3783 * @preply_{pages,len} are initialized both on success and error.
3784 * The caller is responsible for:
3785 *
3786 * ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
3787 */
3788 int ceph_osdc_notify(struct ceph_osd_client *osdc,
3789 struct ceph_object_id *oid,
3790 struct ceph_object_locator *oloc,
3791 void *payload,
3792 size_t payload_len,
3793 u32 timeout,
3794 struct page ***preply_pages,
3795 size_t *preply_len)
3796 {
3797 struct ceph_osd_linger_request *lreq;
3798 struct page **pages;
3799 int ret;
3800
3801 WARN_ON(!timeout);
3802 if (preply_pages) {
3803 *preply_pages = NULL;
3804 *preply_len = 0;
3805 }
3806
3807 lreq = linger_alloc(osdc);
3808 if (!lreq)
3809 return -ENOMEM;
3810
3811 lreq->preply_pages = preply_pages;
3812 lreq->preply_len = preply_len;
3813
3814 ceph_oid_copy(&lreq->t.base_oid, oid);
3815 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
3816 lreq->t.flags = CEPH_OSD_FLAG_READ;
3817
3818 lreq->reg_req = alloc_linger_request(lreq);
3819 if (!lreq->reg_req) {
3820 ret = -ENOMEM;
3821 goto out_put_lreq;
3822 }
3823
3824 /* for notify_id */
3825 pages = ceph_alloc_page_vector(1, GFP_NOIO);
3826 if (IS_ERR(pages)) {
3827 ret = PTR_ERR(pages);
3828 goto out_put_lreq;
3829 }
3830
3831 down_write(&osdc->lock);
3832 linger_register(lreq); /* before osd_req_op_* */
3833 ret = osd_req_op_notify_init(lreq->reg_req, 0, lreq->linger_id, 1,
3834 timeout, payload, payload_len);
3835 if (ret) {
3836 linger_unregister(lreq);
3837 up_write(&osdc->lock);
3838 ceph_release_page_vector(pages, 1);
3839 goto out_put_lreq;
3840 }
3841 ceph_osd_data_pages_init(osd_req_op_data(lreq->reg_req, 0, notify,
3842 response_data),
3843 pages, PAGE_SIZE, 0, false, true);
3844 linger_submit(lreq);
3845 up_write(&osdc->lock);
3846
3847 ret = linger_reg_commit_wait(lreq);
3848 if (!ret)
3849 ret = linger_notify_finish_wait(lreq);
3850 else
3851 dout("lreq %p failed to initiate notify %d\n", lreq, ret);
3852
3853 linger_cancel(lreq);
3854 out_put_lreq:
3855 linger_put(lreq);
3856 return ret;
3857 }
3858 EXPORT_SYMBOL(ceph_osdc_notify);
3859
3860 /*
3861 * Return the number of milliseconds since the watch was last
3862 * confirmed, or an error. If there is an error, the watch is no
3863 * longer valid, and should be destroyed with ceph_osdc_unwatch().
3864 */
3865 int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
3866 struct ceph_osd_linger_request *lreq)
3867 {
3868 unsigned long stamp, age;
3869 int ret;
3870
3871 down_read(&osdc->lock);
3872 mutex_lock(&lreq->lock);
3873 stamp = lreq->watch_valid_thru;
3874 if (!list_empty(&lreq->pending_lworks)) {
3875 struct linger_work *lwork =
3876 list_first_entry(&lreq->pending_lworks,
3877 struct linger_work,
3878 pending_item);
3879
3880 if (time_before(lwork->queued_stamp, stamp))
3881 stamp = lwork->queued_stamp;
3882 }
3883 age = jiffies - stamp;
3884 dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
3885 lreq, lreq->linger_id, age, lreq->last_error);
3886 /* we are truncating to msecs, so return a safe upper bound */
3887 ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
3888
3889 mutex_unlock(&lreq->lock);
3890 up_read(&osdc->lock);
3891 return ret;
3892 }
3893
3894 /*
3895 * Call all pending notify callbacks - for use after a watch is
3896 * unregistered, to make sure no more callbacks for it will be invoked
3897 */
3898 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
3899 {
3900 flush_workqueue(osdc->notify_wq);
3901 }
3902 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
3903
3904 void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
3905 {
3906 down_read(&osdc->lock);
3907 maybe_request_map(osdc);
3908 up_read(&osdc->lock);
3909 }
3910 EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
3911
3912 /*
3913 * init, shutdown
3914 */
3915 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
3916 {
3917 int err;
3918
3919 dout("init\n");
3920 osdc->client = client;
3921 init_rwsem(&osdc->lock);
3922 osdc->osds = RB_ROOT;
3923 INIT_LIST_HEAD(&osdc->osd_lru);
3924 spin_lock_init(&osdc->osd_lru_lock);
3925 osd_init(&osdc->homeless_osd);
3926 osdc->homeless_osd.o_osdc = osdc;
3927 osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
3928 osdc->linger_requests = RB_ROOT;
3929 osdc->map_checks = RB_ROOT;
3930 osdc->linger_map_checks = RB_ROOT;
3931 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
3932 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
3933
3934 err = -ENOMEM;
3935 osdc->osdmap = ceph_osdmap_alloc();
3936 if (!osdc->osdmap)
3937 goto out;
3938
3939 osdc->req_mempool = mempool_create_slab_pool(10,
3940 ceph_osd_request_cache);
3941 if (!osdc->req_mempool)
3942 goto out_map;
3943
3944 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
3945 PAGE_SIZE, 10, true, "osd_op");
3946 if (err < 0)
3947 goto out_mempool;
3948 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
3949 PAGE_SIZE, 10, true, "osd_op_reply");
3950 if (err < 0)
3951 goto out_msgpool;
3952
3953 err = -ENOMEM;
3954 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
3955 if (!osdc->notify_wq)
3956 goto out_msgpool_reply;
3957
3958 schedule_delayed_work(&osdc->timeout_work,
3959 osdc->client->options->osd_keepalive_timeout);
3960 schedule_delayed_work(&osdc->osds_timeout_work,
3961 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
3962
3963 return 0;
3964
3965 out_msgpool_reply:
3966 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
3967 out_msgpool:
3968 ceph_msgpool_destroy(&osdc->msgpool_op);
3969 out_mempool:
3970 mempool_destroy(osdc->req_mempool);
3971 out_map:
3972 ceph_osdmap_destroy(osdc->osdmap);
3973 out:
3974 return err;
3975 }
3976
3977 void ceph_osdc_stop(struct ceph_osd_client *osdc)
3978 {
3979 flush_workqueue(osdc->notify_wq);
3980 destroy_workqueue(osdc->notify_wq);
3981 cancel_delayed_work_sync(&osdc->timeout_work);
3982 cancel_delayed_work_sync(&osdc->osds_timeout_work);
3983
3984 down_write(&osdc->lock);
3985 while (!RB_EMPTY_ROOT(&osdc->osds)) {
3986 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
3987 struct ceph_osd, o_node);
3988 close_osd(osd);
3989 }
3990 up_write(&osdc->lock);
3991 WARN_ON(atomic_read(&osdc->homeless_osd.o_ref) != 1);
3992 osd_cleanup(&osdc->homeless_osd);
3993
3994 WARN_ON(!list_empty(&osdc->osd_lru));
3995 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
3996 WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
3997 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
3998 WARN_ON(atomic_read(&osdc->num_requests));
3999 WARN_ON(atomic_read(&osdc->num_homeless));
4000
4001 ceph_osdmap_destroy(osdc->osdmap);
4002 mempool_destroy(osdc->req_mempool);
4003 ceph_msgpool_destroy(&osdc->msgpool_op);
4004 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4005 }
4006
4007 /*
4008 * Read some contiguous pages. If we cross a stripe boundary, shorten
4009 * *plen. Return number of bytes read, or error.
4010 */
4011 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
4012 struct ceph_vino vino, struct ceph_file_layout *layout,
4013 u64 off, u64 *plen,
4014 u32 truncate_seq, u64 truncate_size,
4015 struct page **pages, int num_pages, int page_align)
4016 {
4017 struct ceph_osd_request *req;
4018 int rc = 0;
4019
4020 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
4021 vino.snap, off, *plen);
4022 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
4023 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
4024 NULL, truncate_seq, truncate_size,
4025 false);
4026 if (IS_ERR(req))
4027 return PTR_ERR(req);
4028
4029 /* it may be a short read due to an object boundary */
4030 osd_req_op_extent_osd_data_pages(req, 0,
4031 pages, *plen, page_align, false, false);
4032
4033 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
4034 off, *plen, *plen, page_align);
4035
4036 rc = ceph_osdc_start_request(osdc, req, false);
4037 if (!rc)
4038 rc = ceph_osdc_wait_request(osdc, req);
4039
4040 ceph_osdc_put_request(req);
4041 dout("readpages result %d\n", rc);
4042 return rc;
4043 }
4044 EXPORT_SYMBOL(ceph_osdc_readpages);
4045
4046 /*
4047 * do a synchronous write on N pages
4048 */
4049 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
4050 struct ceph_file_layout *layout,
4051 struct ceph_snap_context *snapc,
4052 u64 off, u64 len,
4053 u32 truncate_seq, u64 truncate_size,
4054 struct timespec *mtime,
4055 struct page **pages, int num_pages)
4056 {
4057 struct ceph_osd_request *req;
4058 int rc = 0;
4059 int page_align = off & ~PAGE_MASK;
4060
4061 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
4062 CEPH_OSD_OP_WRITE,
4063 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
4064 snapc, truncate_seq, truncate_size,
4065 true);
4066 if (IS_ERR(req))
4067 return PTR_ERR(req);
4068
4069 /* it may be a short write due to an object boundary */
4070 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
4071 false, false);
4072 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
4073
4074 req->r_mtime = *mtime;
4075 rc = ceph_osdc_start_request(osdc, req, true);
4076 if (!rc)
4077 rc = ceph_osdc_wait_request(osdc, req);
4078
4079 ceph_osdc_put_request(req);
4080 if (rc == 0)
4081 rc = len;
4082 dout("writepages result %d\n", rc);
4083 return rc;
4084 }
4085 EXPORT_SYMBOL(ceph_osdc_writepages);
4086
4087 int ceph_osdc_setup(void)
4088 {
4089 size_t size = sizeof(struct ceph_osd_request) +
4090 CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
4091
4092 BUG_ON(ceph_osd_request_cache);
4093 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
4094 0, 0, NULL);
4095
4096 return ceph_osd_request_cache ? 0 : -ENOMEM;
4097 }
4098 EXPORT_SYMBOL(ceph_osdc_setup);
4099
4100 void ceph_osdc_cleanup(void)
4101 {
4102 BUG_ON(!ceph_osd_request_cache);
4103 kmem_cache_destroy(ceph_osd_request_cache);
4104 ceph_osd_request_cache = NULL;
4105 }
4106 EXPORT_SYMBOL(ceph_osdc_cleanup);
4107
4108 /*
4109 * handle incoming message
4110 */
4111 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4112 {
4113 struct ceph_osd *osd = con->private;
4114 struct ceph_osd_client *osdc = osd->o_osdc;
4115 int type = le16_to_cpu(msg->hdr.type);
4116
4117 switch (type) {
4118 case CEPH_MSG_OSD_MAP:
4119 ceph_osdc_handle_map(osdc, msg);
4120 break;
4121 case CEPH_MSG_OSD_OPREPLY:
4122 handle_reply(osd, msg);
4123 break;
4124 case CEPH_MSG_WATCH_NOTIFY:
4125 handle_watch_notify(osdc, msg);
4126 break;
4127
4128 default:
4129 pr_err("received unknown message type %d %s\n", type,
4130 ceph_msg_type_name(type));
4131 }
4132
4133 ceph_msg_put(msg);
4134 }
4135
4136 /*
4137 * Lookup and return message for incoming reply. Don't try to do
4138 * anything about a larger than preallocated data portion of the
4139 * message at the moment - for now, just skip the message.
4140 */
4141 static struct ceph_msg *get_reply(struct ceph_connection *con,
4142 struct ceph_msg_header *hdr,
4143 int *skip)
4144 {
4145 struct ceph_osd *osd = con->private;
4146 struct ceph_osd_client *osdc = osd->o_osdc;
4147 struct ceph_msg *m = NULL;
4148 struct ceph_osd_request *req;
4149 int front_len = le32_to_cpu(hdr->front_len);
4150 int data_len = le32_to_cpu(hdr->data_len);
4151 u64 tid = le64_to_cpu(hdr->tid);
4152
4153 down_read(&osdc->lock);
4154 if (!osd_registered(osd)) {
4155 dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
4156 *skip = 1;
4157 goto out_unlock_osdc;
4158 }
4159 WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));
4160
4161 mutex_lock(&osd->lock);
4162 req = lookup_request(&osd->o_requests, tid);
4163 if (!req) {
4164 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
4165 osd->o_osd, tid);
4166 *skip = 1;
4167 goto out_unlock_session;
4168 }
4169
4170 ceph_msg_revoke_incoming(req->r_reply);
4171
4172 if (front_len > req->r_reply->front_alloc_len) {
4173 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
4174 __func__, osd->o_osd, req->r_tid, front_len,
4175 req->r_reply->front_alloc_len);
4176 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
4177 false);
4178 if (!m)
4179 goto out_unlock_session;
4180 ceph_msg_put(req->r_reply);
4181 req->r_reply = m;
4182 }
4183
4184 if (data_len > req->r_reply->data_length) {
4185 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
4186 __func__, osd->o_osd, req->r_tid, data_len,
4187 req->r_reply->data_length);
4188 m = NULL;
4189 *skip = 1;
4190 goto out_unlock_session;
4191 }
4192
4193 m = ceph_msg_get(req->r_reply);
4194 dout("get_reply tid %lld %p\n", tid, m);
4195
4196 out_unlock_session:
4197 mutex_unlock(&osd->lock);
4198 out_unlock_osdc:
4199 up_read(&osdc->lock);
4200 return m;
4201 }
4202
4203 /*
4204 * TODO: switch to a msg-owned pagelist
4205 */
4206 static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
4207 {
4208 struct ceph_msg *m;
4209 int type = le16_to_cpu(hdr->type);
4210 u32 front_len = le32_to_cpu(hdr->front_len);
4211 u32 data_len = le32_to_cpu(hdr->data_len);
4212
4213 m = ceph_msg_new(type, front_len, GFP_NOIO, false);
4214 if (!m)
4215 return NULL;
4216
4217 if (data_len) {
4218 struct page **pages;
4219 struct ceph_osd_data osd_data;
4220
4221 pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
4222 GFP_NOIO);
4223 if (IS_ERR(pages)) {
4224 ceph_msg_put(m);
4225 return NULL;
4226 }
4227
4228 ceph_osd_data_pages_init(&osd_data, pages, data_len, 0, false,
4229 false);
4230 ceph_osdc_msg_data_add(m, &osd_data);
4231 }
4232
4233 return m;
4234 }
4235
4236 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
4237 struct ceph_msg_header *hdr,
4238 int *skip)
4239 {
4240 struct ceph_osd *osd = con->private;
4241 int type = le16_to_cpu(hdr->type);
4242
4243 *skip = 0;
4244 switch (type) {
4245 case CEPH_MSG_OSD_MAP:
4246 case CEPH_MSG_WATCH_NOTIFY:
4247 return alloc_msg_with_page_vector(hdr);
4248 case CEPH_MSG_OSD_OPREPLY:
4249 return get_reply(con, hdr, skip);
4250 default:
4251 pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
4252 osd->o_osd, type);
4253 *skip = 1;
4254 return NULL;
4255 }
4256 }
4257
4258 /*
4259 * Wrappers to refcount containing ceph_osd struct
4260 */
4261 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
4262 {
4263 struct ceph_osd *osd = con->private;
4264 if (get_osd(osd))
4265 return con;
4266 return NULL;
4267 }
4268
4269 static void put_osd_con(struct ceph_connection *con)
4270 {
4271 struct ceph_osd *osd = con->private;
4272 put_osd(osd);
4273 }
4274
4275 /*
4276 * authentication
4277 */
4278 /*
4279 * Note: returned pointer is the address of a structure that's
4280 * managed separately. Caller must *not* attempt to free it.
4281 */
4282 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4283 int *proto, int force_new)
4284 {
4285 struct ceph_osd *o = con->private;
4286 struct ceph_osd_client *osdc = o->o_osdc;
4287 struct ceph_auth_client *ac = osdc->client->monc.auth;
4288 struct ceph_auth_handshake *auth = &o->o_auth;
4289
4290 if (force_new && auth->authorizer) {
4291 ceph_auth_destroy_authorizer(auth->authorizer);
4292 auth->authorizer = NULL;
4293 }
4294 if (!auth->authorizer) {
4295 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
4296 auth);
4297 if (ret)
4298 return ERR_PTR(ret);
4299 } else {
4300 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
4301 auth);
4302 if (ret)
4303 return ERR_PTR(ret);
4304 }
4305 *proto = ac->protocol;
4306
4307 return auth;
4308 }
4309
4310
4311 static int verify_authorizer_reply(struct ceph_connection *con, int len)
4312 {
4313 struct ceph_osd *o = con->private;
4314 struct ceph_osd_client *osdc = o->o_osdc;
4315 struct ceph_auth_client *ac = osdc->client->monc.auth;
4316
4317 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
4318 }
4319
4320 static int invalidate_authorizer(struct ceph_connection *con)
4321 {
4322 struct ceph_osd *o = con->private;
4323 struct ceph_osd_client *osdc = o->o_osdc;
4324 struct ceph_auth_client *ac = osdc->client->monc.auth;
4325
4326 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
4327 return ceph_monc_validate_auth(&osdc->client->monc);
4328 }
4329
4330 static int osd_sign_message(struct ceph_msg *msg)
4331 {
4332 struct ceph_osd *o = msg->con->private;
4333 struct ceph_auth_handshake *auth = &o->o_auth;
4334
4335 return ceph_auth_sign_message(auth, msg);
4336 }
4337
4338 static int osd_check_message_signature(struct ceph_msg *msg)
4339 {
4340 struct ceph_osd *o = msg->con->private;
4341 struct ceph_auth_handshake *auth = &o->o_auth;
4342
4343 return ceph_auth_check_message_signature(auth, msg);
4344 }
4345
4346 static const struct ceph_connection_operations osd_con_ops = {
4347 .get = get_osd_con,
4348 .put = put_osd_con,
4349 .dispatch = dispatch,
4350 .get_authorizer = get_authorizer,
4351 .verify_authorizer_reply = verify_authorizer_reply,
4352 .invalidate_authorizer = invalidate_authorizer,
4353 .alloc_msg = alloc_msg,
4354 .sign_message = osd_sign_message,
4355 .check_message_signature = osd_check_message_signature,
4356 .fault = osd_fault,
4357 };
Linux with added FPC-III support