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Merge tag 'powerpc-4.13-8' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[mirror_ubuntu-artful-kernel.git] / net / ceph / osd_client.c
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/err.h>
6 #include <linux/highmem.h>
7 #include <linux/mm.h>
8 #include <linux/pagemap.h>
9 #include <linux/slab.h>
10 #include <linux/uaccess.h>
11 #ifdef CONFIG_BLOCK
12 #include <linux/bio.h>
13 #endif
14
15 #include <linux/ceph/ceph_features.h>
16 #include <linux/ceph/libceph.h>
17 #include <linux/ceph/osd_client.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/pagelist.h>
22
23 #define OSD_OPREPLY_FRONT_LEN 512
24
25 static struct kmem_cache *ceph_osd_request_cache;
26
27 static const struct ceph_connection_operations osd_con_ops;
28
29 /*
30 * Implement client access to distributed object storage cluster.
31 *
32 * All data objects are stored within a cluster/cloud of OSDs, or
33 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
34 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
35 * remote daemons serving up and coordinating consistent and safe
36 * access to storage.
37 *
38 * Cluster membership and the mapping of data objects onto storage devices
39 * are described by the osd map.
40 *
41 * We keep track of pending OSD requests (read, write), resubmit
42 * requests to different OSDs when the cluster topology/data layout
43 * change, or retry the affected requests when the communications
44 * channel with an OSD is reset.
45 */
46
47 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
48 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
49 static void link_linger(struct ceph_osd *osd,
50 struct ceph_osd_linger_request *lreq);
51 static void unlink_linger(struct ceph_osd *osd,
52 struct ceph_osd_linger_request *lreq);
53 static void clear_backoffs(struct ceph_osd *osd);
54
55 #if 1
56 static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
57 {
58 bool wrlocked = true;
59
60 if (unlikely(down_read_trylock(sem))) {
61 wrlocked = false;
62 up_read(sem);
63 }
64
65 return wrlocked;
66 }
67 static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
68 {
69 WARN_ON(!rwsem_is_locked(&osdc->lock));
70 }
71 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
72 {
73 WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
74 }
75 static inline void verify_osd_locked(struct ceph_osd *osd)
76 {
77 struct ceph_osd_client *osdc = osd->o_osdc;
78
79 WARN_ON(!(mutex_is_locked(&osd->lock) &&
80 rwsem_is_locked(&osdc->lock)) &&
81 !rwsem_is_wrlocked(&osdc->lock));
82 }
83 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
84 {
85 WARN_ON(!mutex_is_locked(&lreq->lock));
86 }
87 #else
88 static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
89 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
90 static inline void verify_osd_locked(struct ceph_osd *osd) { }
91 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
92 #endif
93
94 /*
95 * calculate the mapping of a file extent onto an object, and fill out the
96 * request accordingly. shorten extent as necessary if it crosses an
97 * object boundary.
98 *
99 * fill osd op in request message.
100 */
101 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
102 u64 *objnum, u64 *objoff, u64 *objlen)
103 {
104 u64 orig_len = *plen;
105 int r;
106
107 /* object extent? */
108 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
109 objoff, objlen);
110 if (r < 0)
111 return r;
112 if (*objlen < orig_len) {
113 *plen = *objlen;
114 dout(" skipping last %llu, final file extent %llu~%llu\n",
115 orig_len - *plen, off, *plen);
116 }
117
118 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
119
120 return 0;
121 }
122
123 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
124 {
125 memset(osd_data, 0, sizeof (*osd_data));
126 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
127 }
128
129 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
130 struct page **pages, u64 length, u32 alignment,
131 bool pages_from_pool, bool own_pages)
132 {
133 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
134 osd_data->pages = pages;
135 osd_data->length = length;
136 osd_data->alignment = alignment;
137 osd_data->pages_from_pool = pages_from_pool;
138 osd_data->own_pages = own_pages;
139 }
140
141 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
142 struct ceph_pagelist *pagelist)
143 {
144 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
145 osd_data->pagelist = pagelist;
146 }
147
148 #ifdef CONFIG_BLOCK
149 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
150 struct bio *bio, size_t bio_length)
151 {
152 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
153 osd_data->bio = bio;
154 osd_data->bio_length = bio_length;
155 }
156 #endif /* CONFIG_BLOCK */
157
158 #define osd_req_op_data(oreq, whch, typ, fld) \
159 ({ \
160 struct ceph_osd_request *__oreq = (oreq); \
161 unsigned int __whch = (whch); \
162 BUG_ON(__whch >= __oreq->r_num_ops); \
163 &__oreq->r_ops[__whch].typ.fld; \
164 })
165
166 static struct ceph_osd_data *
167 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
168 {
169 BUG_ON(which >= osd_req->r_num_ops);
170
171 return &osd_req->r_ops[which].raw_data_in;
172 }
173
174 struct ceph_osd_data *
175 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
176 unsigned int which)
177 {
178 return osd_req_op_data(osd_req, which, extent, osd_data);
179 }
180 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
181
182 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
183 unsigned int which, struct page **pages,
184 u64 length, u32 alignment,
185 bool pages_from_pool, bool own_pages)
186 {
187 struct ceph_osd_data *osd_data;
188
189 osd_data = osd_req_op_raw_data_in(osd_req, which);
190 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
191 pages_from_pool, own_pages);
192 }
193 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
194
195 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
196 unsigned int which, struct page **pages,
197 u64 length, u32 alignment,
198 bool pages_from_pool, bool own_pages)
199 {
200 struct ceph_osd_data *osd_data;
201
202 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
203 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
204 pages_from_pool, own_pages);
205 }
206 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
207
208 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
209 unsigned int which, struct ceph_pagelist *pagelist)
210 {
211 struct ceph_osd_data *osd_data;
212
213 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
214 ceph_osd_data_pagelist_init(osd_data, pagelist);
215 }
216 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
217
218 #ifdef CONFIG_BLOCK
219 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
220 unsigned int which, struct bio *bio, size_t bio_length)
221 {
222 struct ceph_osd_data *osd_data;
223
224 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
225 ceph_osd_data_bio_init(osd_data, bio, bio_length);
226 }
227 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
228 #endif /* CONFIG_BLOCK */
229
230 static void osd_req_op_cls_request_info_pagelist(
231 struct ceph_osd_request *osd_req,
232 unsigned int which, struct ceph_pagelist *pagelist)
233 {
234 struct ceph_osd_data *osd_data;
235
236 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
237 ceph_osd_data_pagelist_init(osd_data, pagelist);
238 }
239
240 void osd_req_op_cls_request_data_pagelist(
241 struct ceph_osd_request *osd_req,
242 unsigned int which, struct ceph_pagelist *pagelist)
243 {
244 struct ceph_osd_data *osd_data;
245
246 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
247 ceph_osd_data_pagelist_init(osd_data, pagelist);
248 osd_req->r_ops[which].cls.indata_len += pagelist->length;
249 osd_req->r_ops[which].indata_len += pagelist->length;
250 }
251 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
252
253 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
254 unsigned int which, struct page **pages, u64 length,
255 u32 alignment, bool pages_from_pool, bool own_pages)
256 {
257 struct ceph_osd_data *osd_data;
258
259 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
260 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
261 pages_from_pool, own_pages);
262 osd_req->r_ops[which].cls.indata_len += length;
263 osd_req->r_ops[which].indata_len += length;
264 }
265 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
266
267 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
268 unsigned int which, struct page **pages, u64 length,
269 u32 alignment, bool pages_from_pool, bool own_pages)
270 {
271 struct ceph_osd_data *osd_data;
272
273 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
274 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
275 pages_from_pool, own_pages);
276 }
277 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
278
279 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
280 {
281 switch (osd_data->type) {
282 case CEPH_OSD_DATA_TYPE_NONE:
283 return 0;
284 case CEPH_OSD_DATA_TYPE_PAGES:
285 return osd_data->length;
286 case CEPH_OSD_DATA_TYPE_PAGELIST:
287 return (u64)osd_data->pagelist->length;
288 #ifdef CONFIG_BLOCK
289 case CEPH_OSD_DATA_TYPE_BIO:
290 return (u64)osd_data->bio_length;
291 #endif /* CONFIG_BLOCK */
292 default:
293 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
294 return 0;
295 }
296 }
297
298 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
299 {
300 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
301 int num_pages;
302
303 num_pages = calc_pages_for((u64)osd_data->alignment,
304 (u64)osd_data->length);
305 ceph_release_page_vector(osd_data->pages, num_pages);
306 }
307 ceph_osd_data_init(osd_data);
308 }
309
310 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
311 unsigned int which)
312 {
313 struct ceph_osd_req_op *op;
314
315 BUG_ON(which >= osd_req->r_num_ops);
316 op = &osd_req->r_ops[which];
317
318 switch (op->op) {
319 case CEPH_OSD_OP_READ:
320 case CEPH_OSD_OP_WRITE:
321 case CEPH_OSD_OP_WRITEFULL:
322 ceph_osd_data_release(&op->extent.osd_data);
323 break;
324 case CEPH_OSD_OP_CALL:
325 ceph_osd_data_release(&op->cls.request_info);
326 ceph_osd_data_release(&op->cls.request_data);
327 ceph_osd_data_release(&op->cls.response_data);
328 break;
329 case CEPH_OSD_OP_SETXATTR:
330 case CEPH_OSD_OP_CMPXATTR:
331 ceph_osd_data_release(&op->xattr.osd_data);
332 break;
333 case CEPH_OSD_OP_STAT:
334 ceph_osd_data_release(&op->raw_data_in);
335 break;
336 case CEPH_OSD_OP_NOTIFY_ACK:
337 ceph_osd_data_release(&op->notify_ack.request_data);
338 break;
339 case CEPH_OSD_OP_NOTIFY:
340 ceph_osd_data_release(&op->notify.request_data);
341 ceph_osd_data_release(&op->notify.response_data);
342 break;
343 case CEPH_OSD_OP_LIST_WATCHERS:
344 ceph_osd_data_release(&op->list_watchers.response_data);
345 break;
346 default:
347 break;
348 }
349 }
350
351 /*
352 * Assumes @t is zero-initialized.
353 */
354 static void target_init(struct ceph_osd_request_target *t)
355 {
356 ceph_oid_init(&t->base_oid);
357 ceph_oloc_init(&t->base_oloc);
358 ceph_oid_init(&t->target_oid);
359 ceph_oloc_init(&t->target_oloc);
360
361 ceph_osds_init(&t->acting);
362 ceph_osds_init(&t->up);
363 t->size = -1;
364 t->min_size = -1;
365
366 t->osd = CEPH_HOMELESS_OSD;
367 }
368
369 static void target_copy(struct ceph_osd_request_target *dest,
370 const struct ceph_osd_request_target *src)
371 {
372 ceph_oid_copy(&dest->base_oid, &src->base_oid);
373 ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
374 ceph_oid_copy(&dest->target_oid, &src->target_oid);
375 ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);
376
377 dest->pgid = src->pgid; /* struct */
378 dest->spgid = src->spgid; /* struct */
379 dest->pg_num = src->pg_num;
380 dest->pg_num_mask = src->pg_num_mask;
381 ceph_osds_copy(&dest->acting, &src->acting);
382 ceph_osds_copy(&dest->up, &src->up);
383 dest->size = src->size;
384 dest->min_size = src->min_size;
385 dest->sort_bitwise = src->sort_bitwise;
386
387 dest->flags = src->flags;
388 dest->paused = src->paused;
389
390 dest->epoch = src->epoch;
391 dest->last_force_resend = src->last_force_resend;
392
393 dest->osd = src->osd;
394 }
395
396 static void target_destroy(struct ceph_osd_request_target *t)
397 {
398 ceph_oid_destroy(&t->base_oid);
399 ceph_oloc_destroy(&t->base_oloc);
400 ceph_oid_destroy(&t->target_oid);
401 ceph_oloc_destroy(&t->target_oloc);
402 }
403
404 /*
405 * requests
406 */
407 static void request_release_checks(struct ceph_osd_request *req)
408 {
409 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
410 WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
411 WARN_ON(!list_empty(&req->r_unsafe_item));
412 WARN_ON(req->r_osd);
413 }
414
415 static void ceph_osdc_release_request(struct kref *kref)
416 {
417 struct ceph_osd_request *req = container_of(kref,
418 struct ceph_osd_request, r_kref);
419 unsigned int which;
420
421 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
422 req->r_request, req->r_reply);
423 request_release_checks(req);
424
425 if (req->r_request)
426 ceph_msg_put(req->r_request);
427 if (req->r_reply)
428 ceph_msg_put(req->r_reply);
429
430 for (which = 0; which < req->r_num_ops; which++)
431 osd_req_op_data_release(req, which);
432
433 target_destroy(&req->r_t);
434 ceph_put_snap_context(req->r_snapc);
435
436 if (req->r_mempool)
437 mempool_free(req, req->r_osdc->req_mempool);
438 else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
439 kmem_cache_free(ceph_osd_request_cache, req);
440 else
441 kfree(req);
442 }
443
444 void ceph_osdc_get_request(struct ceph_osd_request *req)
445 {
446 dout("%s %p (was %d)\n", __func__, req,
447 kref_read(&req->r_kref));
448 kref_get(&req->r_kref);
449 }
450 EXPORT_SYMBOL(ceph_osdc_get_request);
451
452 void ceph_osdc_put_request(struct ceph_osd_request *req)
453 {
454 if (req) {
455 dout("%s %p (was %d)\n", __func__, req,
456 kref_read(&req->r_kref));
457 kref_put(&req->r_kref, ceph_osdc_release_request);
458 }
459 }
460 EXPORT_SYMBOL(ceph_osdc_put_request);
461
462 static void request_init(struct ceph_osd_request *req)
463 {
464 /* req only, each op is zeroed in _osd_req_op_init() */
465 memset(req, 0, sizeof(*req));
466
467 kref_init(&req->r_kref);
468 init_completion(&req->r_completion);
469 RB_CLEAR_NODE(&req->r_node);
470 RB_CLEAR_NODE(&req->r_mc_node);
471 INIT_LIST_HEAD(&req->r_unsafe_item);
472
473 target_init(&req->r_t);
474 }
475
476 /*
477 * This is ugly, but it allows us to reuse linger registration and ping
478 * requests, keeping the structure of the code around send_linger{_ping}()
479 * reasonable. Setting up a min_nr=2 mempool for each linger request
480 * and dealing with copying ops (this blasts req only, watch op remains
481 * intact) isn't any better.
482 */
483 static void request_reinit(struct ceph_osd_request *req)
484 {
485 struct ceph_osd_client *osdc = req->r_osdc;
486 bool mempool = req->r_mempool;
487 unsigned int num_ops = req->r_num_ops;
488 u64 snapid = req->r_snapid;
489 struct ceph_snap_context *snapc = req->r_snapc;
490 bool linger = req->r_linger;
491 struct ceph_msg *request_msg = req->r_request;
492 struct ceph_msg *reply_msg = req->r_reply;
493
494 dout("%s req %p\n", __func__, req);
495 WARN_ON(kref_read(&req->r_kref) != 1);
496 request_release_checks(req);
497
498 WARN_ON(kref_read(&request_msg->kref) != 1);
499 WARN_ON(kref_read(&reply_msg->kref) != 1);
500 target_destroy(&req->r_t);
501
502 request_init(req);
503 req->r_osdc = osdc;
504 req->r_mempool = mempool;
505 req->r_num_ops = num_ops;
506 req->r_snapid = snapid;
507 req->r_snapc = snapc;
508 req->r_linger = linger;
509 req->r_request = request_msg;
510 req->r_reply = reply_msg;
511 }
512
513 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
514 struct ceph_snap_context *snapc,
515 unsigned int num_ops,
516 bool use_mempool,
517 gfp_t gfp_flags)
518 {
519 struct ceph_osd_request *req;
520
521 if (use_mempool) {
522 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
523 req = mempool_alloc(osdc->req_mempool, gfp_flags);
524 } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
525 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
526 } else {
527 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
528 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
529 gfp_flags);
530 }
531 if (unlikely(!req))
532 return NULL;
533
534 request_init(req);
535 req->r_osdc = osdc;
536 req->r_mempool = use_mempool;
537 req->r_num_ops = num_ops;
538 req->r_snapid = CEPH_NOSNAP;
539 req->r_snapc = ceph_get_snap_context(snapc);
540
541 dout("%s req %p\n", __func__, req);
542 return req;
543 }
544 EXPORT_SYMBOL(ceph_osdc_alloc_request);
545
546 static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
547 {
548 return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
549 }
550
551 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
552 {
553 struct ceph_osd_client *osdc = req->r_osdc;
554 struct ceph_msg *msg;
555 int msg_size;
556
557 WARN_ON(ceph_oid_empty(&req->r_base_oid));
558 WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
559
560 /* create request message */
561 msg_size = CEPH_ENCODING_START_BLK_LEN +
562 CEPH_PGID_ENCODING_LEN + 1; /* spgid */
563 msg_size += 4 + 4 + 4; /* hash, osdmap_epoch, flags */
564 msg_size += CEPH_ENCODING_START_BLK_LEN +
565 sizeof(struct ceph_osd_reqid); /* reqid */
566 msg_size += sizeof(struct ceph_blkin_trace_info); /* trace */
567 msg_size += 4 + sizeof(struct ceph_timespec); /* client_inc, mtime */
568 msg_size += CEPH_ENCODING_START_BLK_LEN +
569 ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
570 msg_size += 4 + req->r_base_oid.name_len; /* oid */
571 msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
572 msg_size += 8; /* snapid */
573 msg_size += 8; /* snap_seq */
574 msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
575 msg_size += 4 + 8; /* retry_attempt, features */
576
577 if (req->r_mempool)
578 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
579 else
580 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
581 if (!msg)
582 return -ENOMEM;
583
584 memset(msg->front.iov_base, 0, msg->front.iov_len);
585 req->r_request = msg;
586
587 /* create reply message */
588 msg_size = OSD_OPREPLY_FRONT_LEN;
589 msg_size += req->r_base_oid.name_len;
590 msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
591
592 if (req->r_mempool)
593 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
594 else
595 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
596 if (!msg)
597 return -ENOMEM;
598
599 req->r_reply = msg;
600
601 return 0;
602 }
603 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
604
605 static bool osd_req_opcode_valid(u16 opcode)
606 {
607 switch (opcode) {
608 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
609 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
610 #undef GENERATE_CASE
611 default:
612 return false;
613 }
614 }
615
616 /*
617 * This is an osd op init function for opcodes that have no data or
618 * other information associated with them. It also serves as a
619 * common init routine for all the other init functions, below.
620 */
621 static struct ceph_osd_req_op *
622 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
623 u16 opcode, u32 flags)
624 {
625 struct ceph_osd_req_op *op;
626
627 BUG_ON(which >= osd_req->r_num_ops);
628 BUG_ON(!osd_req_opcode_valid(opcode));
629
630 op = &osd_req->r_ops[which];
631 memset(op, 0, sizeof (*op));
632 op->op = opcode;
633 op->flags = flags;
634
635 return op;
636 }
637
638 void osd_req_op_init(struct ceph_osd_request *osd_req,
639 unsigned int which, u16 opcode, u32 flags)
640 {
641 (void)_osd_req_op_init(osd_req, which, opcode, flags);
642 }
643 EXPORT_SYMBOL(osd_req_op_init);
644
645 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
646 unsigned int which, u16 opcode,
647 u64 offset, u64 length,
648 u64 truncate_size, u32 truncate_seq)
649 {
650 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
651 opcode, 0);
652 size_t payload_len = 0;
653
654 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
655 opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
656 opcode != CEPH_OSD_OP_TRUNCATE);
657
658 op->extent.offset = offset;
659 op->extent.length = length;
660 op->extent.truncate_size = truncate_size;
661 op->extent.truncate_seq = truncate_seq;
662 if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
663 payload_len += length;
664
665 op->indata_len = payload_len;
666 }
667 EXPORT_SYMBOL(osd_req_op_extent_init);
668
669 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
670 unsigned int which, u64 length)
671 {
672 struct ceph_osd_req_op *op;
673 u64 previous;
674
675 BUG_ON(which >= osd_req->r_num_ops);
676 op = &osd_req->r_ops[which];
677 previous = op->extent.length;
678
679 if (length == previous)
680 return; /* Nothing to do */
681 BUG_ON(length > previous);
682
683 op->extent.length = length;
684 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
685 op->indata_len -= previous - length;
686 }
687 EXPORT_SYMBOL(osd_req_op_extent_update);
688
689 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
690 unsigned int which, u64 offset_inc)
691 {
692 struct ceph_osd_req_op *op, *prev_op;
693
694 BUG_ON(which + 1 >= osd_req->r_num_ops);
695
696 prev_op = &osd_req->r_ops[which];
697 op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
698 /* dup previous one */
699 op->indata_len = prev_op->indata_len;
700 op->outdata_len = prev_op->outdata_len;
701 op->extent = prev_op->extent;
702 /* adjust offset */
703 op->extent.offset += offset_inc;
704 op->extent.length -= offset_inc;
705
706 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
707 op->indata_len -= offset_inc;
708 }
709 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
710
711 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
712 u16 opcode, const char *class, const char *method)
713 {
714 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
715 opcode, 0);
716 struct ceph_pagelist *pagelist;
717 size_t payload_len = 0;
718 size_t size;
719
720 BUG_ON(opcode != CEPH_OSD_OP_CALL);
721
722 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
723 BUG_ON(!pagelist);
724 ceph_pagelist_init(pagelist);
725
726 op->cls.class_name = class;
727 size = strlen(class);
728 BUG_ON(size > (size_t) U8_MAX);
729 op->cls.class_len = size;
730 ceph_pagelist_append(pagelist, class, size);
731 payload_len += size;
732
733 op->cls.method_name = method;
734 size = strlen(method);
735 BUG_ON(size > (size_t) U8_MAX);
736 op->cls.method_len = size;
737 ceph_pagelist_append(pagelist, method, size);
738 payload_len += size;
739
740 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
741
742 op->indata_len = payload_len;
743 }
744 EXPORT_SYMBOL(osd_req_op_cls_init);
745
746 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
747 u16 opcode, const char *name, const void *value,
748 size_t size, u8 cmp_op, u8 cmp_mode)
749 {
750 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
751 opcode, 0);
752 struct ceph_pagelist *pagelist;
753 size_t payload_len;
754
755 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
756
757 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
758 if (!pagelist)
759 return -ENOMEM;
760
761 ceph_pagelist_init(pagelist);
762
763 payload_len = strlen(name);
764 op->xattr.name_len = payload_len;
765 ceph_pagelist_append(pagelist, name, payload_len);
766
767 op->xattr.value_len = size;
768 ceph_pagelist_append(pagelist, value, size);
769 payload_len += size;
770
771 op->xattr.cmp_op = cmp_op;
772 op->xattr.cmp_mode = cmp_mode;
773
774 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
775 op->indata_len = payload_len;
776 return 0;
777 }
778 EXPORT_SYMBOL(osd_req_op_xattr_init);
779
780 /*
781 * @watch_opcode: CEPH_OSD_WATCH_OP_*
782 */
783 static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
784 u64 cookie, u8 watch_opcode)
785 {
786 struct ceph_osd_req_op *op;
787
788 op = _osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
789 op->watch.cookie = cookie;
790 op->watch.op = watch_opcode;
791 op->watch.gen = 0;
792 }
793
794 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
795 unsigned int which,
796 u64 expected_object_size,
797 u64 expected_write_size)
798 {
799 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
800 CEPH_OSD_OP_SETALLOCHINT,
801 0);
802
803 op->alloc_hint.expected_object_size = expected_object_size;
804 op->alloc_hint.expected_write_size = expected_write_size;
805
806 /*
807 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
808 * not worth a feature bit. Set FAILOK per-op flag to make
809 * sure older osds don't trip over an unsupported opcode.
810 */
811 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
812 }
813 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
814
815 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
816 struct ceph_osd_data *osd_data)
817 {
818 u64 length = ceph_osd_data_length(osd_data);
819
820 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
821 BUG_ON(length > (u64) SIZE_MAX);
822 if (length)
823 ceph_msg_data_add_pages(msg, osd_data->pages,
824 length, osd_data->alignment);
825 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
826 BUG_ON(!length);
827 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
828 #ifdef CONFIG_BLOCK
829 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
830 ceph_msg_data_add_bio(msg, osd_data->bio, length);
831 #endif
832 } else {
833 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
834 }
835 }
836
837 static u32 osd_req_encode_op(struct ceph_osd_op *dst,
838 const struct ceph_osd_req_op *src)
839 {
840 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
841 pr_err("unrecognized osd opcode %d\n", src->op);
842
843 return 0;
844 }
845
846 switch (src->op) {
847 case CEPH_OSD_OP_STAT:
848 break;
849 case CEPH_OSD_OP_READ:
850 case CEPH_OSD_OP_WRITE:
851 case CEPH_OSD_OP_WRITEFULL:
852 case CEPH_OSD_OP_ZERO:
853 case CEPH_OSD_OP_TRUNCATE:
854 dst->extent.offset = cpu_to_le64(src->extent.offset);
855 dst->extent.length = cpu_to_le64(src->extent.length);
856 dst->extent.truncate_size =
857 cpu_to_le64(src->extent.truncate_size);
858 dst->extent.truncate_seq =
859 cpu_to_le32(src->extent.truncate_seq);
860 break;
861 case CEPH_OSD_OP_CALL:
862 dst->cls.class_len = src->cls.class_len;
863 dst->cls.method_len = src->cls.method_len;
864 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
865 break;
866 case CEPH_OSD_OP_STARTSYNC:
867 break;
868 case CEPH_OSD_OP_WATCH:
869 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
870 dst->watch.ver = cpu_to_le64(0);
871 dst->watch.op = src->watch.op;
872 dst->watch.gen = cpu_to_le32(src->watch.gen);
873 break;
874 case CEPH_OSD_OP_NOTIFY_ACK:
875 break;
876 case CEPH_OSD_OP_NOTIFY:
877 dst->notify.cookie = cpu_to_le64(src->notify.cookie);
878 break;
879 case CEPH_OSD_OP_LIST_WATCHERS:
880 break;
881 case CEPH_OSD_OP_SETALLOCHINT:
882 dst->alloc_hint.expected_object_size =
883 cpu_to_le64(src->alloc_hint.expected_object_size);
884 dst->alloc_hint.expected_write_size =
885 cpu_to_le64(src->alloc_hint.expected_write_size);
886 break;
887 case CEPH_OSD_OP_SETXATTR:
888 case CEPH_OSD_OP_CMPXATTR:
889 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
890 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
891 dst->xattr.cmp_op = src->xattr.cmp_op;
892 dst->xattr.cmp_mode = src->xattr.cmp_mode;
893 break;
894 case CEPH_OSD_OP_CREATE:
895 case CEPH_OSD_OP_DELETE:
896 break;
897 default:
898 pr_err("unsupported osd opcode %s\n",
899 ceph_osd_op_name(src->op));
900 WARN_ON(1);
901
902 return 0;
903 }
904
905 dst->op = cpu_to_le16(src->op);
906 dst->flags = cpu_to_le32(src->flags);
907 dst->payload_len = cpu_to_le32(src->indata_len);
908
909 return src->indata_len;
910 }
911
912 /*
913 * build new request AND message, calculate layout, and adjust file
914 * extent as needed.
915 *
916 * if the file was recently truncated, we include information about its
917 * old and new size so that the object can be updated appropriately. (we
918 * avoid synchronously deleting truncated objects because it's slow.)
919 *
920 * if @do_sync, include a 'startsync' command so that the osd will flush
921 * data quickly.
922 */
923 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
924 struct ceph_file_layout *layout,
925 struct ceph_vino vino,
926 u64 off, u64 *plen,
927 unsigned int which, int num_ops,
928 int opcode, int flags,
929 struct ceph_snap_context *snapc,
930 u32 truncate_seq,
931 u64 truncate_size,
932 bool use_mempool)
933 {
934 struct ceph_osd_request *req;
935 u64 objnum = 0;
936 u64 objoff = 0;
937 u64 objlen = 0;
938 int r;
939
940 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
941 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
942 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
943
944 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
945 GFP_NOFS);
946 if (!req) {
947 r = -ENOMEM;
948 goto fail;
949 }
950
951 /* calculate max write size */
952 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
953 if (r)
954 goto fail;
955
956 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
957 osd_req_op_init(req, which, opcode, 0);
958 } else {
959 u32 object_size = layout->object_size;
960 u32 object_base = off - objoff;
961 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
962 if (truncate_size <= object_base) {
963 truncate_size = 0;
964 } else {
965 truncate_size -= object_base;
966 if (truncate_size > object_size)
967 truncate_size = object_size;
968 }
969 }
970 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
971 truncate_size, truncate_seq);
972 }
973
974 req->r_abort_on_full = true;
975 req->r_flags = flags;
976 req->r_base_oloc.pool = layout->pool_id;
977 req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
978 ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
979
980 req->r_snapid = vino.snap;
981 if (flags & CEPH_OSD_FLAG_WRITE)
982 req->r_data_offset = off;
983
984 r = ceph_osdc_alloc_messages(req, GFP_NOFS);
985 if (r)
986 goto fail;
987
988 return req;
989
990 fail:
991 ceph_osdc_put_request(req);
992 return ERR_PTR(r);
993 }
994 EXPORT_SYMBOL(ceph_osdc_new_request);
995
996 /*
997 * We keep osd requests in an rbtree, sorted by ->r_tid.
998 */
999 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
1000 DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
1001
1002 static bool osd_homeless(struct ceph_osd *osd)
1003 {
1004 return osd->o_osd == CEPH_HOMELESS_OSD;
1005 }
1006
1007 static bool osd_registered(struct ceph_osd *osd)
1008 {
1009 verify_osdc_locked(osd->o_osdc);
1010
1011 return !RB_EMPTY_NODE(&osd->o_node);
1012 }
1013
1014 /*
1015 * Assumes @osd is zero-initialized.
1016 */
1017 static void osd_init(struct ceph_osd *osd)
1018 {
1019 refcount_set(&osd->o_ref, 1);
1020 RB_CLEAR_NODE(&osd->o_node);
1021 osd->o_requests = RB_ROOT;
1022 osd->o_linger_requests = RB_ROOT;
1023 osd->o_backoff_mappings = RB_ROOT;
1024 osd->o_backoffs_by_id = RB_ROOT;
1025 INIT_LIST_HEAD(&osd->o_osd_lru);
1026 INIT_LIST_HEAD(&osd->o_keepalive_item);
1027 osd->o_incarnation = 1;
1028 mutex_init(&osd->lock);
1029 }
1030
1031 static void osd_cleanup(struct ceph_osd *osd)
1032 {
1033 WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1034 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1035 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1036 WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoff_mappings));
1037 WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoffs_by_id));
1038 WARN_ON(!list_empty(&osd->o_osd_lru));
1039 WARN_ON(!list_empty(&osd->o_keepalive_item));
1040
1041 if (osd->o_auth.authorizer) {
1042 WARN_ON(osd_homeless(osd));
1043 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1044 }
1045 }
1046
1047 /*
1048 * Track open sessions with osds.
1049 */
1050 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1051 {
1052 struct ceph_osd *osd;
1053
1054 WARN_ON(onum == CEPH_HOMELESS_OSD);
1055
1056 osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1057 osd_init(osd);
1058 osd->o_osdc = osdc;
1059 osd->o_osd = onum;
1060
1061 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1062
1063 return osd;
1064 }
1065
1066 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1067 {
1068 if (refcount_inc_not_zero(&osd->o_ref)) {
1069 dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
1070 refcount_read(&osd->o_ref));
1071 return osd;
1072 } else {
1073 dout("get_osd %p FAIL\n", osd);
1074 return NULL;
1075 }
1076 }
1077
1078 static void put_osd(struct ceph_osd *osd)
1079 {
1080 dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
1081 refcount_read(&osd->o_ref) - 1);
1082 if (refcount_dec_and_test(&osd->o_ref)) {
1083 osd_cleanup(osd);
1084 kfree(osd);
1085 }
1086 }
1087
1088 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1089
1090 static void __move_osd_to_lru(struct ceph_osd *osd)
1091 {
1092 struct ceph_osd_client *osdc = osd->o_osdc;
1093
1094 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1095 BUG_ON(!list_empty(&osd->o_osd_lru));
1096
1097 spin_lock(&osdc->osd_lru_lock);
1098 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1099 spin_unlock(&osdc->osd_lru_lock);
1100
1101 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1102 }
1103
1104 static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1105 {
1106 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1107 RB_EMPTY_ROOT(&osd->o_linger_requests))
1108 __move_osd_to_lru(osd);
1109 }
1110
1111 static void __remove_osd_from_lru(struct ceph_osd *osd)
1112 {
1113 struct ceph_osd_client *osdc = osd->o_osdc;
1114
1115 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1116
1117 spin_lock(&osdc->osd_lru_lock);
1118 if (!list_empty(&osd->o_osd_lru))
1119 list_del_init(&osd->o_osd_lru);
1120 spin_unlock(&osdc->osd_lru_lock);
1121 }
1122
1123 /*
1124 * Close the connection and assign any leftover requests to the
1125 * homeless session.
1126 */
1127 static void close_osd(struct ceph_osd *osd)
1128 {
1129 struct ceph_osd_client *osdc = osd->o_osdc;
1130 struct rb_node *n;
1131
1132 verify_osdc_wrlocked(osdc);
1133 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1134
1135 ceph_con_close(&osd->o_con);
1136
1137 for (n = rb_first(&osd->o_requests); n; ) {
1138 struct ceph_osd_request *req =
1139 rb_entry(n, struct ceph_osd_request, r_node);
1140
1141 n = rb_next(n); /* unlink_request() */
1142
1143 dout(" reassigning req %p tid %llu\n", req, req->r_tid);
1144 unlink_request(osd, req);
1145 link_request(&osdc->homeless_osd, req);
1146 }
1147 for (n = rb_first(&osd->o_linger_requests); n; ) {
1148 struct ceph_osd_linger_request *lreq =
1149 rb_entry(n, struct ceph_osd_linger_request, node);
1150
1151 n = rb_next(n); /* unlink_linger() */
1152
1153 dout(" reassigning lreq %p linger_id %llu\n", lreq,
1154 lreq->linger_id);
1155 unlink_linger(osd, lreq);
1156 link_linger(&osdc->homeless_osd, lreq);
1157 }
1158 clear_backoffs(osd);
1159
1160 __remove_osd_from_lru(osd);
1161 erase_osd(&osdc->osds, osd);
1162 put_osd(osd);
1163 }
1164
1165 /*
1166 * reset osd connect
1167 */
1168 static int reopen_osd(struct ceph_osd *osd)
1169 {
1170 struct ceph_entity_addr *peer_addr;
1171
1172 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1173
1174 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1175 RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1176 close_osd(osd);
1177 return -ENODEV;
1178 }
1179
1180 peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
1181 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1182 !ceph_con_opened(&osd->o_con)) {
1183 struct rb_node *n;
1184
1185 dout("osd addr hasn't changed and connection never opened, "
1186 "letting msgr retry\n");
1187 /* touch each r_stamp for handle_timeout()'s benfit */
1188 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
1189 struct ceph_osd_request *req =
1190 rb_entry(n, struct ceph_osd_request, r_node);
1191 req->r_stamp = jiffies;
1192 }
1193
1194 return -EAGAIN;
1195 }
1196
1197 ceph_con_close(&osd->o_con);
1198 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1199 osd->o_incarnation++;
1200
1201 return 0;
1202 }
1203
1204 static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
1205 bool wrlocked)
1206 {
1207 struct ceph_osd *osd;
1208
1209 if (wrlocked)
1210 verify_osdc_wrlocked(osdc);
1211 else
1212 verify_osdc_locked(osdc);
1213
1214 if (o != CEPH_HOMELESS_OSD)
1215 osd = lookup_osd(&osdc->osds, o);
1216 else
1217 osd = &osdc->homeless_osd;
1218 if (!osd) {
1219 if (!wrlocked)
1220 return ERR_PTR(-EAGAIN);
1221
1222 osd = create_osd(osdc, o);
1223 insert_osd(&osdc->osds, osd);
1224 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
1225 &osdc->osdmap->osd_addr[osd->o_osd]);
1226 }
1227
1228 dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
1229 return osd;
1230 }
1231
1232 /*
1233 * Create request <-> OSD session relation.
1234 *
1235 * @req has to be assigned a tid, @osd may be homeless.
1236 */
1237 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1238 {
1239 verify_osd_locked(osd);
1240 WARN_ON(!req->r_tid || req->r_osd);
1241 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1242 req, req->r_tid);
1243
1244 if (!osd_homeless(osd))
1245 __remove_osd_from_lru(osd);
1246 else
1247 atomic_inc(&osd->o_osdc->num_homeless);
1248
1249 get_osd(osd);
1250 insert_request(&osd->o_requests, req);
1251 req->r_osd = osd;
1252 }
1253
1254 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1255 {
1256 verify_osd_locked(osd);
1257 WARN_ON(req->r_osd != osd);
1258 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1259 req, req->r_tid);
1260
1261 req->r_osd = NULL;
1262 erase_request(&osd->o_requests, req);
1263 put_osd(osd);
1264
1265 if (!osd_homeless(osd))
1266 maybe_move_osd_to_lru(osd);
1267 else
1268 atomic_dec(&osd->o_osdc->num_homeless);
1269 }
1270
1271 static bool __pool_full(struct ceph_pg_pool_info *pi)
1272 {
1273 return pi->flags & CEPH_POOL_FLAG_FULL;
1274 }
1275
1276 static bool have_pool_full(struct ceph_osd_client *osdc)
1277 {
1278 struct rb_node *n;
1279
1280 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
1281 struct ceph_pg_pool_info *pi =
1282 rb_entry(n, struct ceph_pg_pool_info, node);
1283
1284 if (__pool_full(pi))
1285 return true;
1286 }
1287
1288 return false;
1289 }
1290
1291 static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
1292 {
1293 struct ceph_pg_pool_info *pi;
1294
1295 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
1296 if (!pi)
1297 return false;
1298
1299 return __pool_full(pi);
1300 }
1301
1302 /*
1303 * Returns whether a request should be blocked from being sent
1304 * based on the current osdmap and osd_client settings.
1305 */
1306 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1307 const struct ceph_osd_request_target *t,
1308 struct ceph_pg_pool_info *pi)
1309 {
1310 bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
1311 bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
1312 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1313 __pool_full(pi);
1314
1315 WARN_ON(pi->id != t->target_oloc.pool);
1316 return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
1317 ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
1318 (osdc->osdmap->epoch < osdc->epoch_barrier);
1319 }
1320
1321 enum calc_target_result {
1322 CALC_TARGET_NO_ACTION = 0,
1323 CALC_TARGET_NEED_RESEND,
1324 CALC_TARGET_POOL_DNE,
1325 };
1326
1327 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1328 struct ceph_osd_request_target *t,
1329 struct ceph_connection *con,
1330 bool any_change)
1331 {
1332 struct ceph_pg_pool_info *pi;
1333 struct ceph_pg pgid, last_pgid;
1334 struct ceph_osds up, acting;
1335 bool force_resend = false;
1336 bool unpaused = false;
1337 bool legacy_change;
1338 bool split = false;
1339 bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1340 bool recovery_deletes = ceph_osdmap_flag(osdc,
1341 CEPH_OSDMAP_RECOVERY_DELETES);
1342 enum calc_target_result ct_res;
1343 int ret;
1344
1345 t->epoch = osdc->osdmap->epoch;
1346 pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1347 if (!pi) {
1348 t->osd = CEPH_HOMELESS_OSD;
1349 ct_res = CALC_TARGET_POOL_DNE;
1350 goto out;
1351 }
1352
1353 if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1354 if (t->last_force_resend < pi->last_force_request_resend) {
1355 t->last_force_resend = pi->last_force_request_resend;
1356 force_resend = true;
1357 } else if (t->last_force_resend == 0) {
1358 force_resend = true;
1359 }
1360 }
1361
1362 /* apply tiering */
1363 ceph_oid_copy(&t->target_oid, &t->base_oid);
1364 ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1365 if ((t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1366 if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
1367 t->target_oloc.pool = pi->read_tier;
1368 if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
1369 t->target_oloc.pool = pi->write_tier;
1370
1371 pi = ceph_pg_pool_by_id(osdc->osdmap, t->target_oloc.pool);
1372 if (!pi) {
1373 t->osd = CEPH_HOMELESS_OSD;
1374 ct_res = CALC_TARGET_POOL_DNE;
1375 goto out;
1376 }
1377 }
1378
1379 ret = __ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc,
1380 &pgid);
1381 if (ret) {
1382 WARN_ON(ret != -ENOENT);
1383 t->osd = CEPH_HOMELESS_OSD;
1384 ct_res = CALC_TARGET_POOL_DNE;
1385 goto out;
1386 }
1387 last_pgid.pool = pgid.pool;
1388 last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1389
1390 ceph_pg_to_up_acting_osds(osdc->osdmap, pi, &pgid, &up, &acting);
1391 if (any_change &&
1392 ceph_is_new_interval(&t->acting,
1393 &acting,
1394 &t->up,
1395 &up,
1396 t->size,
1397 pi->size,
1398 t->min_size,
1399 pi->min_size,
1400 t->pg_num,
1401 pi->pg_num,
1402 t->sort_bitwise,
1403 sort_bitwise,
1404 t->recovery_deletes,
1405 recovery_deletes,
1406 &last_pgid))
1407 force_resend = true;
1408
1409 if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1410 t->paused = false;
1411 unpaused = true;
1412 }
1413 legacy_change = ceph_pg_compare(&t->pgid, &pgid) ||
1414 ceph_osds_changed(&t->acting, &acting, any_change);
1415 if (t->pg_num)
1416 split = ceph_pg_is_split(&last_pgid, t->pg_num, pi->pg_num);
1417
1418 if (legacy_change || force_resend || split) {
1419 t->pgid = pgid; /* struct */
1420 ceph_pg_to_primary_shard(osdc->osdmap, pi, &pgid, &t->spgid);
1421 ceph_osds_copy(&t->acting, &acting);
1422 ceph_osds_copy(&t->up, &up);
1423 t->size = pi->size;
1424 t->min_size = pi->min_size;
1425 t->pg_num = pi->pg_num;
1426 t->pg_num_mask = pi->pg_num_mask;
1427 t->sort_bitwise = sort_bitwise;
1428 t->recovery_deletes = recovery_deletes;
1429
1430 t->osd = acting.primary;
1431 }
1432
1433 if (unpaused || legacy_change || force_resend ||
1434 (split && con && CEPH_HAVE_FEATURE(con->peer_features,
1435 RESEND_ON_SPLIT)))
1436 ct_res = CALC_TARGET_NEED_RESEND;
1437 else
1438 ct_res = CALC_TARGET_NO_ACTION;
1439
1440 out:
1441 dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
1442 return ct_res;
1443 }
1444
1445 static struct ceph_spg_mapping *alloc_spg_mapping(void)
1446 {
1447 struct ceph_spg_mapping *spg;
1448
1449 spg = kmalloc(sizeof(*spg), GFP_NOIO);
1450 if (!spg)
1451 return NULL;
1452
1453 RB_CLEAR_NODE(&spg->node);
1454 spg->backoffs = RB_ROOT;
1455 return spg;
1456 }
1457
1458 static void free_spg_mapping(struct ceph_spg_mapping *spg)
1459 {
1460 WARN_ON(!RB_EMPTY_NODE(&spg->node));
1461 WARN_ON(!RB_EMPTY_ROOT(&spg->backoffs));
1462
1463 kfree(spg);
1464 }
1465
1466 /*
1467 * rbtree of ceph_spg_mapping for handling map<spg_t, ...>, similar to
1468 * ceph_pg_mapping. Used to track OSD backoffs -- a backoff [range] is
1469 * defined only within a specific spgid; it does not pass anything to
1470 * children on split, or to another primary.
1471 */
1472 DEFINE_RB_FUNCS2(spg_mapping, struct ceph_spg_mapping, spgid, ceph_spg_compare,
1473 RB_BYPTR, const struct ceph_spg *, node)
1474
1475 static u64 hoid_get_bitwise_key(const struct ceph_hobject_id *hoid)
1476 {
1477 return hoid->is_max ? 0x100000000ull : hoid->hash_reverse_bits;
1478 }
1479
1480 static void hoid_get_effective_key(const struct ceph_hobject_id *hoid,
1481 void **pkey, size_t *pkey_len)
1482 {
1483 if (hoid->key_len) {
1484 *pkey = hoid->key;
1485 *pkey_len = hoid->key_len;
1486 } else {
1487 *pkey = hoid->oid;
1488 *pkey_len = hoid->oid_len;
1489 }
1490 }
1491
1492 static int compare_names(const void *name1, size_t name1_len,
1493 const void *name2, size_t name2_len)
1494 {
1495 int ret;
1496
1497 ret = memcmp(name1, name2, min(name1_len, name2_len));
1498 if (!ret) {
1499 if (name1_len < name2_len)
1500 ret = -1;
1501 else if (name1_len > name2_len)
1502 ret = 1;
1503 }
1504 return ret;
1505 }
1506
1507 static int hoid_compare(const struct ceph_hobject_id *lhs,
1508 const struct ceph_hobject_id *rhs)
1509 {
1510 void *effective_key1, *effective_key2;
1511 size_t effective_key1_len, effective_key2_len;
1512 int ret;
1513
1514 if (lhs->is_max < rhs->is_max)
1515 return -1;
1516 if (lhs->is_max > rhs->is_max)
1517 return 1;
1518
1519 if (lhs->pool < rhs->pool)
1520 return -1;
1521 if (lhs->pool > rhs->pool)
1522 return 1;
1523
1524 if (hoid_get_bitwise_key(lhs) < hoid_get_bitwise_key(rhs))
1525 return -1;
1526 if (hoid_get_bitwise_key(lhs) > hoid_get_bitwise_key(rhs))
1527 return 1;
1528
1529 ret = compare_names(lhs->nspace, lhs->nspace_len,
1530 rhs->nspace, rhs->nspace_len);
1531 if (ret)
1532 return ret;
1533
1534 hoid_get_effective_key(lhs, &effective_key1, &effective_key1_len);
1535 hoid_get_effective_key(rhs, &effective_key2, &effective_key2_len);
1536 ret = compare_names(effective_key1, effective_key1_len,
1537 effective_key2, effective_key2_len);
1538 if (ret)
1539 return ret;
1540
1541 ret = compare_names(lhs->oid, lhs->oid_len, rhs->oid, rhs->oid_len);
1542 if (ret)
1543 return ret;
1544
1545 if (lhs->snapid < rhs->snapid)
1546 return -1;
1547 if (lhs->snapid > rhs->snapid)
1548 return 1;
1549
1550 return 0;
1551 }
1552
1553 /*
1554 * For decoding ->begin and ->end of MOSDBackoff only -- no MIN/MAX
1555 * compat stuff here.
1556 *
1557 * Assumes @hoid is zero-initialized.
1558 */
1559 static int decode_hoid(void **p, void *end, struct ceph_hobject_id *hoid)
1560 {
1561 u8 struct_v;
1562 u32 struct_len;
1563 int ret;
1564
1565 ret = ceph_start_decoding(p, end, 4, "hobject_t", &struct_v,
1566 &struct_len);
1567 if (ret)
1568 return ret;
1569
1570 if (struct_v < 4) {
1571 pr_err("got struct_v %d < 4 of hobject_t\n", struct_v);
1572 goto e_inval;
1573 }
1574
1575 hoid->key = ceph_extract_encoded_string(p, end, &hoid->key_len,
1576 GFP_NOIO);
1577 if (IS_ERR(hoid->key)) {
1578 ret = PTR_ERR(hoid->key);
1579 hoid->key = NULL;
1580 return ret;
1581 }
1582
1583 hoid->oid = ceph_extract_encoded_string(p, end, &hoid->oid_len,
1584 GFP_NOIO);
1585 if (IS_ERR(hoid->oid)) {
1586 ret = PTR_ERR(hoid->oid);
1587 hoid->oid = NULL;
1588 return ret;
1589 }
1590
1591 ceph_decode_64_safe(p, end, hoid->snapid, e_inval);
1592 ceph_decode_32_safe(p, end, hoid->hash, e_inval);
1593 ceph_decode_8_safe(p, end, hoid->is_max, e_inval);
1594
1595 hoid->nspace = ceph_extract_encoded_string(p, end, &hoid->nspace_len,
1596 GFP_NOIO);
1597 if (IS_ERR(hoid->nspace)) {
1598 ret = PTR_ERR(hoid->nspace);
1599 hoid->nspace = NULL;
1600 return ret;
1601 }
1602
1603 ceph_decode_64_safe(p, end, hoid->pool, e_inval);
1604
1605 ceph_hoid_build_hash_cache(hoid);
1606 return 0;
1607
1608 e_inval:
1609 return -EINVAL;
1610 }
1611
1612 static int hoid_encoding_size(const struct ceph_hobject_id *hoid)
1613 {
1614 return 8 + 4 + 1 + 8 + /* snapid, hash, is_max, pool */
1615 4 + hoid->key_len + 4 + hoid->oid_len + 4 + hoid->nspace_len;
1616 }
1617
1618 static void encode_hoid(void **p, void *end, const struct ceph_hobject_id *hoid)
1619 {
1620 ceph_start_encoding(p, 4, 3, hoid_encoding_size(hoid));
1621 ceph_encode_string(p, end, hoid->key, hoid->key_len);
1622 ceph_encode_string(p, end, hoid->oid, hoid->oid_len);
1623 ceph_encode_64(p, hoid->snapid);
1624 ceph_encode_32(p, hoid->hash);
1625 ceph_encode_8(p, hoid->is_max);
1626 ceph_encode_string(p, end, hoid->nspace, hoid->nspace_len);
1627 ceph_encode_64(p, hoid->pool);
1628 }
1629
1630 static void free_hoid(struct ceph_hobject_id *hoid)
1631 {
1632 if (hoid) {
1633 kfree(hoid->key);
1634 kfree(hoid->oid);
1635 kfree(hoid->nspace);
1636 kfree(hoid);
1637 }
1638 }
1639
1640 static struct ceph_osd_backoff *alloc_backoff(void)
1641 {
1642 struct ceph_osd_backoff *backoff;
1643
1644 backoff = kzalloc(sizeof(*backoff), GFP_NOIO);
1645 if (!backoff)
1646 return NULL;
1647
1648 RB_CLEAR_NODE(&backoff->spg_node);
1649 RB_CLEAR_NODE(&backoff->id_node);
1650 return backoff;
1651 }
1652
1653 static void free_backoff(struct ceph_osd_backoff *backoff)
1654 {
1655 WARN_ON(!RB_EMPTY_NODE(&backoff->spg_node));
1656 WARN_ON(!RB_EMPTY_NODE(&backoff->id_node));
1657
1658 free_hoid(backoff->begin);
1659 free_hoid(backoff->end);
1660 kfree(backoff);
1661 }
1662
1663 /*
1664 * Within a specific spgid, backoffs are managed by ->begin hoid.
1665 */
1666 DEFINE_RB_INSDEL_FUNCS2(backoff, struct ceph_osd_backoff, begin, hoid_compare,
1667 RB_BYVAL, spg_node);
1668
1669 static struct ceph_osd_backoff *lookup_containing_backoff(struct rb_root *root,
1670 const struct ceph_hobject_id *hoid)
1671 {
1672 struct rb_node *n = root->rb_node;
1673
1674 while (n) {
1675 struct ceph_osd_backoff *cur =
1676 rb_entry(n, struct ceph_osd_backoff, spg_node);
1677 int cmp;
1678
1679 cmp = hoid_compare(hoid, cur->begin);
1680 if (cmp < 0) {
1681 n = n->rb_left;
1682 } else if (cmp > 0) {
1683 if (hoid_compare(hoid, cur->end) < 0)
1684 return cur;
1685
1686 n = n->rb_right;
1687 } else {
1688 return cur;
1689 }
1690 }
1691
1692 return NULL;
1693 }
1694
1695 /*
1696 * Each backoff has a unique id within its OSD session.
1697 */
1698 DEFINE_RB_FUNCS(backoff_by_id, struct ceph_osd_backoff, id, id_node)
1699
1700 static void clear_backoffs(struct ceph_osd *osd)
1701 {
1702 while (!RB_EMPTY_ROOT(&osd->o_backoff_mappings)) {
1703 struct ceph_spg_mapping *spg =
1704 rb_entry(rb_first(&osd->o_backoff_mappings),
1705 struct ceph_spg_mapping, node);
1706
1707 while (!RB_EMPTY_ROOT(&spg->backoffs)) {
1708 struct ceph_osd_backoff *backoff =
1709 rb_entry(rb_first(&spg->backoffs),
1710 struct ceph_osd_backoff, spg_node);
1711
1712 erase_backoff(&spg->backoffs, backoff);
1713 erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
1714 free_backoff(backoff);
1715 }
1716 erase_spg_mapping(&osd->o_backoff_mappings, spg);
1717 free_spg_mapping(spg);
1718 }
1719 }
1720
1721 /*
1722 * Set up a temporary, non-owning view into @t.
1723 */
1724 static void hoid_fill_from_target(struct ceph_hobject_id *hoid,
1725 const struct ceph_osd_request_target *t)
1726 {
1727 hoid->key = NULL;
1728 hoid->key_len = 0;
1729 hoid->oid = t->target_oid.name;
1730 hoid->oid_len = t->target_oid.name_len;
1731 hoid->snapid = CEPH_NOSNAP;
1732 hoid->hash = t->pgid.seed;
1733 hoid->is_max = false;
1734 if (t->target_oloc.pool_ns) {
1735 hoid->nspace = t->target_oloc.pool_ns->str;
1736 hoid->nspace_len = t->target_oloc.pool_ns->len;
1737 } else {
1738 hoid->nspace = NULL;
1739 hoid->nspace_len = 0;
1740 }
1741 hoid->pool = t->target_oloc.pool;
1742 ceph_hoid_build_hash_cache(hoid);
1743 }
1744
1745 static bool should_plug_request(struct ceph_osd_request *req)
1746 {
1747 struct ceph_osd *osd = req->r_osd;
1748 struct ceph_spg_mapping *spg;
1749 struct ceph_osd_backoff *backoff;
1750 struct ceph_hobject_id hoid;
1751
1752 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &req->r_t.spgid);
1753 if (!spg)
1754 return false;
1755
1756 hoid_fill_from_target(&hoid, &req->r_t);
1757 backoff = lookup_containing_backoff(&spg->backoffs, &hoid);
1758 if (!backoff)
1759 return false;
1760
1761 dout("%s req %p tid %llu backoff osd%d spgid %llu.%xs%d id %llu\n",
1762 __func__, req, req->r_tid, osd->o_osd, backoff->spgid.pgid.pool,
1763 backoff->spgid.pgid.seed, backoff->spgid.shard, backoff->id);
1764 return true;
1765 }
1766
1767 static void setup_request_data(struct ceph_osd_request *req,
1768 struct ceph_msg *msg)
1769 {
1770 u32 data_len = 0;
1771 int i;
1772
1773 if (!list_empty(&msg->data))
1774 return;
1775
1776 WARN_ON(msg->data_length);
1777 for (i = 0; i < req->r_num_ops; i++) {
1778 struct ceph_osd_req_op *op = &req->r_ops[i];
1779
1780 switch (op->op) {
1781 /* request */
1782 case CEPH_OSD_OP_WRITE:
1783 case CEPH_OSD_OP_WRITEFULL:
1784 WARN_ON(op->indata_len != op->extent.length);
1785 ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
1786 break;
1787 case CEPH_OSD_OP_SETXATTR:
1788 case CEPH_OSD_OP_CMPXATTR:
1789 WARN_ON(op->indata_len != op->xattr.name_len +
1790 op->xattr.value_len);
1791 ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
1792 break;
1793 case CEPH_OSD_OP_NOTIFY_ACK:
1794 ceph_osdc_msg_data_add(msg,
1795 &op->notify_ack.request_data);
1796 break;
1797
1798 /* reply */
1799 case CEPH_OSD_OP_STAT:
1800 ceph_osdc_msg_data_add(req->r_reply,
1801 &op->raw_data_in);
1802 break;
1803 case CEPH_OSD_OP_READ:
1804 ceph_osdc_msg_data_add(req->r_reply,
1805 &op->extent.osd_data);
1806 break;
1807 case CEPH_OSD_OP_LIST_WATCHERS:
1808 ceph_osdc_msg_data_add(req->r_reply,
1809 &op->list_watchers.response_data);
1810 break;
1811
1812 /* both */
1813 case CEPH_OSD_OP_CALL:
1814 WARN_ON(op->indata_len != op->cls.class_len +
1815 op->cls.method_len +
1816 op->cls.indata_len);
1817 ceph_osdc_msg_data_add(msg, &op->cls.request_info);
1818 /* optional, can be NONE */
1819 ceph_osdc_msg_data_add(msg, &op->cls.request_data);
1820 /* optional, can be NONE */
1821 ceph_osdc_msg_data_add(req->r_reply,
1822 &op->cls.response_data);
1823 break;
1824 case CEPH_OSD_OP_NOTIFY:
1825 ceph_osdc_msg_data_add(msg,
1826 &op->notify.request_data);
1827 ceph_osdc_msg_data_add(req->r_reply,
1828 &op->notify.response_data);
1829 break;
1830 }
1831
1832 data_len += op->indata_len;
1833 }
1834
1835 WARN_ON(data_len != msg->data_length);
1836 }
1837
1838 static void encode_pgid(void **p, const struct ceph_pg *pgid)
1839 {
1840 ceph_encode_8(p, 1);
1841 ceph_encode_64(p, pgid->pool);
1842 ceph_encode_32(p, pgid->seed);
1843 ceph_encode_32(p, -1); /* preferred */
1844 }
1845
1846 static void encode_spgid(void **p, const struct ceph_spg *spgid)
1847 {
1848 ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
1849 encode_pgid(p, &spgid->pgid);
1850 ceph_encode_8(p, spgid->shard);
1851 }
1852
1853 static void encode_oloc(void **p, void *end,
1854 const struct ceph_object_locator *oloc)
1855 {
1856 ceph_start_encoding(p, 5, 4, ceph_oloc_encoding_size(oloc));
1857 ceph_encode_64(p, oloc->pool);
1858 ceph_encode_32(p, -1); /* preferred */
1859 ceph_encode_32(p, 0); /* key len */
1860 if (oloc->pool_ns)
1861 ceph_encode_string(p, end, oloc->pool_ns->str,
1862 oloc->pool_ns->len);
1863 else
1864 ceph_encode_32(p, 0);
1865 }
1866
1867 static void encode_request_partial(struct ceph_osd_request *req,
1868 struct ceph_msg *msg)
1869 {
1870 void *p = msg->front.iov_base;
1871 void *const end = p + msg->front_alloc_len;
1872 u32 data_len = 0;
1873 int i;
1874
1875 if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
1876 /* snapshots aren't writeable */
1877 WARN_ON(req->r_snapid != CEPH_NOSNAP);
1878 } else {
1879 WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
1880 req->r_data_offset || req->r_snapc);
1881 }
1882
1883 setup_request_data(req, msg);
1884
1885 encode_spgid(&p, &req->r_t.spgid); /* actual spg */
1886 ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */
1887 ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
1888 ceph_encode_32(&p, req->r_flags);
1889
1890 /* reqid */
1891 ceph_start_encoding(&p, 2, 2, sizeof(struct ceph_osd_reqid));
1892 memset(p, 0, sizeof(struct ceph_osd_reqid));
1893 p += sizeof(struct ceph_osd_reqid);
1894
1895 /* trace */
1896 memset(p, 0, sizeof(struct ceph_blkin_trace_info));
1897 p += sizeof(struct ceph_blkin_trace_info);
1898
1899 ceph_encode_32(&p, 0); /* client_inc, always 0 */
1900 ceph_encode_timespec(p, &req->r_mtime);
1901 p += sizeof(struct ceph_timespec);
1902
1903 encode_oloc(&p, end, &req->r_t.target_oloc);
1904 ceph_encode_string(&p, end, req->r_t.target_oid.name,
1905 req->r_t.target_oid.name_len);
1906
1907 /* ops, can imply data */
1908 ceph_encode_16(&p, req->r_num_ops);
1909 for (i = 0; i < req->r_num_ops; i++) {
1910 data_len += osd_req_encode_op(p, &req->r_ops[i]);
1911 p += sizeof(struct ceph_osd_op);
1912 }
1913
1914 ceph_encode_64(&p, req->r_snapid); /* snapid */
1915 if (req->r_snapc) {
1916 ceph_encode_64(&p, req->r_snapc->seq);
1917 ceph_encode_32(&p, req->r_snapc->num_snaps);
1918 for (i = 0; i < req->r_snapc->num_snaps; i++)
1919 ceph_encode_64(&p, req->r_snapc->snaps[i]);
1920 } else {
1921 ceph_encode_64(&p, 0); /* snap_seq */
1922 ceph_encode_32(&p, 0); /* snaps len */
1923 }
1924
1925 ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
1926 BUG_ON(p > end - 8); /* space for features */
1927
1928 msg->hdr.version = cpu_to_le16(8); /* MOSDOp v8 */
1929 /* front_len is finalized in encode_request_finish() */
1930 msg->front.iov_len = p - msg->front.iov_base;
1931 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1932 msg->hdr.data_len = cpu_to_le32(data_len);
1933 /*
1934 * The header "data_off" is a hint to the receiver allowing it
1935 * to align received data into its buffers such that there's no
1936 * need to re-copy it before writing it to disk (direct I/O).
1937 */
1938 msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
1939
1940 dout("%s req %p msg %p oid %s oid_len %d\n", __func__, req, msg,
1941 req->r_t.target_oid.name, req->r_t.target_oid.name_len);
1942 }
1943
1944 static void encode_request_finish(struct ceph_msg *msg)
1945 {
1946 void *p = msg->front.iov_base;
1947 void *const partial_end = p + msg->front.iov_len;
1948 void *const end = p + msg->front_alloc_len;
1949
1950 if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {
1951 /* luminous OSD -- encode features and be done */
1952 p = partial_end;
1953 ceph_encode_64(&p, msg->con->peer_features);
1954 } else {
1955 struct {
1956 char spgid[CEPH_ENCODING_START_BLK_LEN +
1957 CEPH_PGID_ENCODING_LEN + 1];
1958 __le32 hash;
1959 __le32 epoch;
1960 __le32 flags;
1961 char reqid[CEPH_ENCODING_START_BLK_LEN +
1962 sizeof(struct ceph_osd_reqid)];
1963 char trace[sizeof(struct ceph_blkin_trace_info)];
1964 __le32 client_inc;
1965 struct ceph_timespec mtime;
1966 } __packed head;
1967 struct ceph_pg pgid;
1968 void *oloc, *oid, *tail;
1969 int oloc_len, oid_len, tail_len;
1970 int len;
1971
1972 /*
1973 * Pre-luminous OSD -- reencode v8 into v4 using @head
1974 * as a temporary buffer. Encode the raw PG; the rest
1975 * is just a matter of moving oloc, oid and tail blobs
1976 * around.
1977 */
1978 memcpy(&head, p, sizeof(head));
1979 p += sizeof(head);
1980
1981 oloc = p;
1982 p += CEPH_ENCODING_START_BLK_LEN;
1983 pgid.pool = ceph_decode_64(&p);
1984 p += 4 + 4; /* preferred, key len */
1985 len = ceph_decode_32(&p);
1986 p += len; /* nspace */
1987 oloc_len = p - oloc;
1988
1989 oid = p;
1990 len = ceph_decode_32(&p);
1991 p += len;
1992 oid_len = p - oid;
1993
1994 tail = p;
1995 tail_len = partial_end - p;
1996
1997 p = msg->front.iov_base;
1998 ceph_encode_copy(&p, &head.client_inc, sizeof(head.client_inc));
1999 ceph_encode_copy(&p, &head.epoch, sizeof(head.epoch));
2000 ceph_encode_copy(&p, &head.flags, sizeof(head.flags));
2001 ceph_encode_copy(&p, &head.mtime, sizeof(head.mtime));
2002
2003 /* reassert_version */
2004 memset(p, 0, sizeof(struct ceph_eversion));
2005 p += sizeof(struct ceph_eversion);
2006
2007 BUG_ON(p >= oloc);
2008 memmove(p, oloc, oloc_len);
2009 p += oloc_len;
2010
2011 pgid.seed = le32_to_cpu(head.hash);
2012 encode_pgid(&p, &pgid); /* raw pg */
2013
2014 BUG_ON(p >= oid);
2015 memmove(p, oid, oid_len);
2016 p += oid_len;
2017
2018 /* tail -- ops, snapid, snapc, retry_attempt */
2019 BUG_ON(p >= tail);
2020 memmove(p, tail, tail_len);
2021 p += tail_len;
2022
2023 msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
2024 }
2025
2026 BUG_ON(p > end);
2027 msg->front.iov_len = p - msg->front.iov_base;
2028 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2029
2030 dout("%s msg %p tid %llu %u+%u+%u v%d\n", __func__, msg,
2031 le64_to_cpu(msg->hdr.tid), le32_to_cpu(msg->hdr.front_len),
2032 le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len),
2033 le16_to_cpu(msg->hdr.version));
2034 }
2035
2036 /*
2037 * @req has to be assigned a tid and registered.
2038 */
2039 static void send_request(struct ceph_osd_request *req)
2040 {
2041 struct ceph_osd *osd = req->r_osd;
2042
2043 verify_osd_locked(osd);
2044 WARN_ON(osd->o_osd != req->r_t.osd);
2045
2046 /* backoff? */
2047 if (should_plug_request(req))
2048 return;
2049
2050 /*
2051 * We may have a previously queued request message hanging
2052 * around. Cancel it to avoid corrupting the msgr.
2053 */
2054 if (req->r_sent)
2055 ceph_msg_revoke(req->r_request);
2056
2057 req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
2058 if (req->r_attempts)
2059 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2060 else
2061 WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);
2062
2063 encode_request_partial(req, req->r_request);
2064
2065 dout("%s req %p tid %llu to pgid %llu.%x spgid %llu.%xs%d osd%d e%u flags 0x%x attempt %d\n",
2066 __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
2067 req->r_t.spgid.pgid.pool, req->r_t.spgid.pgid.seed,
2068 req->r_t.spgid.shard, osd->o_osd, req->r_t.epoch, req->r_flags,
2069 req->r_attempts);
2070
2071 req->r_t.paused = false;
2072 req->r_stamp = jiffies;
2073 req->r_attempts++;
2074
2075 req->r_sent = osd->o_incarnation;
2076 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
2077 ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
2078 }
2079
2080 static void maybe_request_map(struct ceph_osd_client *osdc)
2081 {
2082 bool continuous = false;
2083
2084 verify_osdc_locked(osdc);
2085 WARN_ON(!osdc->osdmap->epoch);
2086
2087 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2088 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
2089 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2090 dout("%s osdc %p continuous\n", __func__, osdc);
2091 continuous = true;
2092 } else {
2093 dout("%s osdc %p onetime\n", __func__, osdc);
2094 }
2095
2096 if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2097 osdc->osdmap->epoch + 1, continuous))
2098 ceph_monc_renew_subs(&osdc->client->monc);
2099 }
2100
2101 static void complete_request(struct ceph_osd_request *req, int err);
2102 static void send_map_check(struct ceph_osd_request *req);
2103
2104 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
2105 {
2106 struct ceph_osd_client *osdc = req->r_osdc;
2107 struct ceph_osd *osd;
2108 enum calc_target_result ct_res;
2109 bool need_send = false;
2110 bool promoted = false;
2111 bool need_abort = false;
2112
2113 WARN_ON(req->r_tid);
2114 dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
2115
2116 again:
2117 ct_res = calc_target(osdc, &req->r_t, NULL, false);
2118 if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
2119 goto promote;
2120
2121 osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
2122 if (IS_ERR(osd)) {
2123 WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
2124 goto promote;
2125 }
2126
2127 if (osdc->osdmap->epoch < osdc->epoch_barrier) {
2128 dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
2129 osdc->epoch_barrier);
2130 req->r_t.paused = true;
2131 maybe_request_map(osdc);
2132 } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2133 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2134 dout("req %p pausewr\n", req);
2135 req->r_t.paused = true;
2136 maybe_request_map(osdc);
2137 } else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
2138 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2139 dout("req %p pauserd\n", req);
2140 req->r_t.paused = true;
2141 maybe_request_map(osdc);
2142 } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2143 !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
2144 CEPH_OSD_FLAG_FULL_FORCE)) &&
2145 (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2146 pool_full(osdc, req->r_t.base_oloc.pool))) {
2147 dout("req %p full/pool_full\n", req);
2148 pr_warn_ratelimited("FULL or reached pool quota\n");
2149 req->r_t.paused = true;
2150 maybe_request_map(osdc);
2151 if (req->r_abort_on_full)
2152 need_abort = true;
2153 } else if (!osd_homeless(osd)) {
2154 need_send = true;
2155 } else {
2156 maybe_request_map(osdc);
2157 }
2158
2159 mutex_lock(&osd->lock);
2160 /*
2161 * Assign the tid atomically with send_request() to protect
2162 * multiple writes to the same object from racing with each
2163 * other, resulting in out of order ops on the OSDs.
2164 */
2165 req->r_tid = atomic64_inc_return(&osdc->last_tid);
2166 link_request(osd, req);
2167 if (need_send)
2168 send_request(req);
2169 else if (need_abort)
2170 complete_request(req, -ENOSPC);
2171 mutex_unlock(&osd->lock);
2172
2173 if (ct_res == CALC_TARGET_POOL_DNE)
2174 send_map_check(req);
2175
2176 if (promoted)
2177 downgrade_write(&osdc->lock);
2178 return;
2179
2180 promote:
2181 up_read(&osdc->lock);
2182 down_write(&osdc->lock);
2183 wrlocked = true;
2184 promoted = true;
2185 goto again;
2186 }
2187
2188 static void account_request(struct ceph_osd_request *req)
2189 {
2190 WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
2191 WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
2192
2193 req->r_flags |= CEPH_OSD_FLAG_ONDISK;
2194 atomic_inc(&req->r_osdc->num_requests);
2195
2196 req->r_start_stamp = jiffies;
2197 }
2198
2199 static void submit_request(struct ceph_osd_request *req, bool wrlocked)
2200 {
2201 ceph_osdc_get_request(req);
2202 account_request(req);
2203 __submit_request(req, wrlocked);
2204 }
2205
2206 static void finish_request(struct ceph_osd_request *req)
2207 {
2208 struct ceph_osd_client *osdc = req->r_osdc;
2209
2210 WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
2211 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2212
2213 if (req->r_osd)
2214 unlink_request(req->r_osd, req);
2215 atomic_dec(&osdc->num_requests);
2216
2217 /*
2218 * If an OSD has failed or returned and a request has been sent
2219 * twice, it's possible to get a reply and end up here while the
2220 * request message is queued for delivery. We will ignore the
2221 * reply, so not a big deal, but better to try and catch it.
2222 */
2223 ceph_msg_revoke(req->r_request);
2224 ceph_msg_revoke_incoming(req->r_reply);
2225 }
2226
2227 static void __complete_request(struct ceph_osd_request *req)
2228 {
2229 if (req->r_callback) {
2230 dout("%s req %p tid %llu cb %pf result %d\n", __func__, req,
2231 req->r_tid, req->r_callback, req->r_result);
2232 req->r_callback(req);
2233 }
2234 }
2235
2236 /*
2237 * This is open-coded in handle_reply().
2238 */
2239 static void complete_request(struct ceph_osd_request *req, int err)
2240 {
2241 dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2242
2243 req->r_result = err;
2244 finish_request(req);
2245 __complete_request(req);
2246 complete_all(&req->r_completion);
2247 ceph_osdc_put_request(req);
2248 }
2249
2250 static void cancel_map_check(struct ceph_osd_request *req)
2251 {
2252 struct ceph_osd_client *osdc = req->r_osdc;
2253 struct ceph_osd_request *lookup_req;
2254
2255 verify_osdc_wrlocked(osdc);
2256
2257 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2258 if (!lookup_req)
2259 return;
2260
2261 WARN_ON(lookup_req != req);
2262 erase_request_mc(&osdc->map_checks, req);
2263 ceph_osdc_put_request(req);
2264 }
2265
2266 static void cancel_request(struct ceph_osd_request *req)
2267 {
2268 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2269
2270 cancel_map_check(req);
2271 finish_request(req);
2272 complete_all(&req->r_completion);
2273 ceph_osdc_put_request(req);
2274 }
2275
2276 static void abort_request(struct ceph_osd_request *req, int err)
2277 {
2278 dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2279
2280 cancel_map_check(req);
2281 complete_request(req, err);
2282 }
2283
2284 static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2285 {
2286 if (likely(eb > osdc->epoch_barrier)) {
2287 dout("updating epoch_barrier from %u to %u\n",
2288 osdc->epoch_barrier, eb);
2289 osdc->epoch_barrier = eb;
2290 /* Request map if we're not to the barrier yet */
2291 if (eb > osdc->osdmap->epoch)
2292 maybe_request_map(osdc);
2293 }
2294 }
2295
2296 void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2297 {
2298 down_read(&osdc->lock);
2299 if (unlikely(eb > osdc->epoch_barrier)) {
2300 up_read(&osdc->lock);
2301 down_write(&osdc->lock);
2302 update_epoch_barrier(osdc, eb);
2303 up_write(&osdc->lock);
2304 } else {
2305 up_read(&osdc->lock);
2306 }
2307 }
2308 EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);
2309
2310 /*
2311 * Drop all pending requests that are stalled waiting on a full condition to
2312 * clear, and complete them with ENOSPC as the return code. Set the
2313 * osdc->epoch_barrier to the latest map epoch that we've seen if any were
2314 * cancelled.
2315 */
2316 static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
2317 {
2318 struct rb_node *n;
2319 bool victims = false;
2320
2321 dout("enter abort_on_full\n");
2322
2323 if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
2324 goto out;
2325
2326 /* Scan list and see if there is anything to abort */
2327 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2328 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2329 struct rb_node *m;
2330
2331 m = rb_first(&osd->o_requests);
2332 while (m) {
2333 struct ceph_osd_request *req = rb_entry(m,
2334 struct ceph_osd_request, r_node);
2335 m = rb_next(m);
2336
2337 if (req->r_abort_on_full) {
2338 victims = true;
2339 break;
2340 }
2341 }
2342 if (victims)
2343 break;
2344 }
2345
2346 if (!victims)
2347 goto out;
2348
2349 /*
2350 * Update the barrier to current epoch if it's behind that point,
2351 * since we know we have some calls to be aborted in the tree.
2352 */
2353 update_epoch_barrier(osdc, osdc->osdmap->epoch);
2354
2355 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2356 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2357 struct rb_node *m;
2358
2359 m = rb_first(&osd->o_requests);
2360 while (m) {
2361 struct ceph_osd_request *req = rb_entry(m,
2362 struct ceph_osd_request, r_node);
2363 m = rb_next(m);
2364
2365 if (req->r_abort_on_full &&
2366 (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2367 pool_full(osdc, req->r_t.target_oloc.pool)))
2368 abort_request(req, -ENOSPC);
2369 }
2370 }
2371 out:
2372 dout("return abort_on_full barrier=%u\n", osdc->epoch_barrier);
2373 }
2374
2375 static void check_pool_dne(struct ceph_osd_request *req)
2376 {
2377 struct ceph_osd_client *osdc = req->r_osdc;
2378 struct ceph_osdmap *map = osdc->osdmap;
2379
2380 verify_osdc_wrlocked(osdc);
2381 WARN_ON(!map->epoch);
2382
2383 if (req->r_attempts) {
2384 /*
2385 * We sent a request earlier, which means that
2386 * previously the pool existed, and now it does not
2387 * (i.e., it was deleted).
2388 */
2389 req->r_map_dne_bound = map->epoch;
2390 dout("%s req %p tid %llu pool disappeared\n", __func__, req,
2391 req->r_tid);
2392 } else {
2393 dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
2394 req, req->r_tid, req->r_map_dne_bound, map->epoch);
2395 }
2396
2397 if (req->r_map_dne_bound) {
2398 if (map->epoch >= req->r_map_dne_bound) {
2399 /* we had a new enough map */
2400 pr_info_ratelimited("tid %llu pool does not exist\n",
2401 req->r_tid);
2402 complete_request(req, -ENOENT);
2403 }
2404 } else {
2405 send_map_check(req);
2406 }
2407 }
2408
2409 static void map_check_cb(struct ceph_mon_generic_request *greq)
2410 {
2411 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2412 struct ceph_osd_request *req;
2413 u64 tid = greq->private_data;
2414
2415 WARN_ON(greq->result || !greq->u.newest);
2416
2417 down_write(&osdc->lock);
2418 req = lookup_request_mc(&osdc->map_checks, tid);
2419 if (!req) {
2420 dout("%s tid %llu dne\n", __func__, tid);
2421 goto out_unlock;
2422 }
2423
2424 dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
2425 req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
2426 if (!req->r_map_dne_bound)
2427 req->r_map_dne_bound = greq->u.newest;
2428 erase_request_mc(&osdc->map_checks, req);
2429 check_pool_dne(req);
2430
2431 ceph_osdc_put_request(req);
2432 out_unlock:
2433 up_write(&osdc->lock);
2434 }
2435
2436 static void send_map_check(struct ceph_osd_request *req)
2437 {
2438 struct ceph_osd_client *osdc = req->r_osdc;
2439 struct ceph_osd_request *lookup_req;
2440 int ret;
2441
2442 verify_osdc_wrlocked(osdc);
2443
2444 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2445 if (lookup_req) {
2446 WARN_ON(lookup_req != req);
2447 return;
2448 }
2449
2450 ceph_osdc_get_request(req);
2451 insert_request_mc(&osdc->map_checks, req);
2452 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
2453 map_check_cb, req->r_tid);
2454 WARN_ON(ret);
2455 }
2456
2457 /*
2458 * lingering requests, watch/notify v2 infrastructure
2459 */
2460 static void linger_release(struct kref *kref)
2461 {
2462 struct ceph_osd_linger_request *lreq =
2463 container_of(kref, struct ceph_osd_linger_request, kref);
2464
2465 dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
2466 lreq->reg_req, lreq->ping_req);
2467 WARN_ON(!RB_EMPTY_NODE(&lreq->node));
2468 WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
2469 WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
2470 WARN_ON(!list_empty(&lreq->scan_item));
2471 WARN_ON(!list_empty(&lreq->pending_lworks));
2472 WARN_ON(lreq->osd);
2473
2474 if (lreq->reg_req)
2475 ceph_osdc_put_request(lreq->reg_req);
2476 if (lreq->ping_req)
2477 ceph_osdc_put_request(lreq->ping_req);
2478 target_destroy(&lreq->t);
2479 kfree(lreq);
2480 }
2481
2482 static void linger_put(struct ceph_osd_linger_request *lreq)
2483 {
2484 if (lreq)
2485 kref_put(&lreq->kref, linger_release);
2486 }
2487
2488 static struct ceph_osd_linger_request *
2489 linger_get(struct ceph_osd_linger_request *lreq)
2490 {
2491 kref_get(&lreq->kref);
2492 return lreq;
2493 }
2494
2495 static struct ceph_osd_linger_request *
2496 linger_alloc(struct ceph_osd_client *osdc)
2497 {
2498 struct ceph_osd_linger_request *lreq;
2499
2500 lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
2501 if (!lreq)
2502 return NULL;
2503
2504 kref_init(&lreq->kref);
2505 mutex_init(&lreq->lock);
2506 RB_CLEAR_NODE(&lreq->node);
2507 RB_CLEAR_NODE(&lreq->osdc_node);
2508 RB_CLEAR_NODE(&lreq->mc_node);
2509 INIT_LIST_HEAD(&lreq->scan_item);
2510 INIT_LIST_HEAD(&lreq->pending_lworks);
2511 init_completion(&lreq->reg_commit_wait);
2512 init_completion(&lreq->notify_finish_wait);
2513
2514 lreq->osdc = osdc;
2515 target_init(&lreq->t);
2516
2517 dout("%s lreq %p\n", __func__, lreq);
2518 return lreq;
2519 }
2520
2521 DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
2522 DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
2523 DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
2524
2525 /*
2526 * Create linger request <-> OSD session relation.
2527 *
2528 * @lreq has to be registered, @osd may be homeless.
2529 */
2530 static void link_linger(struct ceph_osd *osd,
2531 struct ceph_osd_linger_request *lreq)
2532 {
2533 verify_osd_locked(osd);
2534 WARN_ON(!lreq->linger_id || lreq->osd);
2535 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2536 osd->o_osd, lreq, lreq->linger_id);
2537
2538 if (!osd_homeless(osd))
2539 __remove_osd_from_lru(osd);
2540 else
2541 atomic_inc(&osd->o_osdc->num_homeless);
2542
2543 get_osd(osd);
2544 insert_linger(&osd->o_linger_requests, lreq);
2545 lreq->osd = osd;
2546 }
2547
2548 static void unlink_linger(struct ceph_osd *osd,
2549 struct ceph_osd_linger_request *lreq)
2550 {
2551 verify_osd_locked(osd);
2552 WARN_ON(lreq->osd != osd);
2553 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2554 osd->o_osd, lreq, lreq->linger_id);
2555
2556 lreq->osd = NULL;
2557 erase_linger(&osd->o_linger_requests, lreq);
2558 put_osd(osd);
2559
2560 if (!osd_homeless(osd))
2561 maybe_move_osd_to_lru(osd);
2562 else
2563 atomic_dec(&osd->o_osdc->num_homeless);
2564 }
2565
2566 static bool __linger_registered(struct ceph_osd_linger_request *lreq)
2567 {
2568 verify_osdc_locked(lreq->osdc);
2569
2570 return !RB_EMPTY_NODE(&lreq->osdc_node);
2571 }
2572
2573 static bool linger_registered(struct ceph_osd_linger_request *lreq)
2574 {
2575 struct ceph_osd_client *osdc = lreq->osdc;
2576 bool registered;
2577
2578 down_read(&osdc->lock);
2579 registered = __linger_registered(lreq);
2580 up_read(&osdc->lock);
2581
2582 return registered;
2583 }
2584
2585 static void linger_register(struct ceph_osd_linger_request *lreq)
2586 {
2587 struct ceph_osd_client *osdc = lreq->osdc;
2588
2589 verify_osdc_wrlocked(osdc);
2590 WARN_ON(lreq->linger_id);
2591
2592 linger_get(lreq);
2593 lreq->linger_id = ++osdc->last_linger_id;
2594 insert_linger_osdc(&osdc->linger_requests, lreq);
2595 }
2596
2597 static void linger_unregister(struct ceph_osd_linger_request *lreq)
2598 {
2599 struct ceph_osd_client *osdc = lreq->osdc;
2600
2601 verify_osdc_wrlocked(osdc);
2602
2603 erase_linger_osdc(&osdc->linger_requests, lreq);
2604 linger_put(lreq);
2605 }
2606
2607 static void cancel_linger_request(struct ceph_osd_request *req)
2608 {
2609 struct ceph_osd_linger_request *lreq = req->r_priv;
2610
2611 WARN_ON(!req->r_linger);
2612 cancel_request(req);
2613 linger_put(lreq);
2614 }
2615
2616 struct linger_work {
2617 struct work_struct work;
2618 struct ceph_osd_linger_request *lreq;
2619 struct list_head pending_item;
2620 unsigned long queued_stamp;
2621
2622 union {
2623 struct {
2624 u64 notify_id;
2625 u64 notifier_id;
2626 void *payload; /* points into @msg front */
2627 size_t payload_len;
2628
2629 struct ceph_msg *msg; /* for ceph_msg_put() */
2630 } notify;
2631 struct {
2632 int err;
2633 } error;
2634 };
2635 };
2636
2637 static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
2638 work_func_t workfn)
2639 {
2640 struct linger_work *lwork;
2641
2642 lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
2643 if (!lwork)
2644 return NULL;
2645
2646 INIT_WORK(&lwork->work, workfn);
2647 INIT_LIST_HEAD(&lwork->pending_item);
2648 lwork->lreq = linger_get(lreq);
2649
2650 return lwork;
2651 }
2652
2653 static void lwork_free(struct linger_work *lwork)
2654 {
2655 struct ceph_osd_linger_request *lreq = lwork->lreq;
2656
2657 mutex_lock(&lreq->lock);
2658 list_del(&lwork->pending_item);
2659 mutex_unlock(&lreq->lock);
2660
2661 linger_put(lreq);
2662 kfree(lwork);
2663 }
2664
2665 static void lwork_queue(struct linger_work *lwork)
2666 {
2667 struct ceph_osd_linger_request *lreq = lwork->lreq;
2668 struct ceph_osd_client *osdc = lreq->osdc;
2669
2670 verify_lreq_locked(lreq);
2671 WARN_ON(!list_empty(&lwork->pending_item));
2672
2673 lwork->queued_stamp = jiffies;
2674 list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2675 queue_work(osdc->notify_wq, &lwork->work);
2676 }
2677
2678 static void do_watch_notify(struct work_struct *w)
2679 {
2680 struct linger_work *lwork = container_of(w, struct linger_work, work);
2681 struct ceph_osd_linger_request *lreq = lwork->lreq;
2682
2683 if (!linger_registered(lreq)) {
2684 dout("%s lreq %p not registered\n", __func__, lreq);
2685 goto out;
2686 }
2687
2688 WARN_ON(!lreq->is_watch);
2689 dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
2690 __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
2691 lwork->notify.payload_len);
2692 lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
2693 lwork->notify.notifier_id, lwork->notify.payload,
2694 lwork->notify.payload_len);
2695
2696 out:
2697 ceph_msg_put(lwork->notify.msg);
2698 lwork_free(lwork);
2699 }
2700
2701 static void do_watch_error(struct work_struct *w)
2702 {
2703 struct linger_work *lwork = container_of(w, struct linger_work, work);
2704 struct ceph_osd_linger_request *lreq = lwork->lreq;
2705
2706 if (!linger_registered(lreq)) {
2707 dout("%s lreq %p not registered\n", __func__, lreq);
2708 goto out;
2709 }
2710
2711 dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
2712 lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);
2713
2714 out:
2715 lwork_free(lwork);
2716 }
2717
2718 static void queue_watch_error(struct ceph_osd_linger_request *lreq)
2719 {
2720 struct linger_work *lwork;
2721
2722 lwork = lwork_alloc(lreq, do_watch_error);
2723 if (!lwork) {
2724 pr_err("failed to allocate error-lwork\n");
2725 return;
2726 }
2727
2728 lwork->error.err = lreq->last_error;
2729 lwork_queue(lwork);
2730 }
2731
2732 static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
2733 int result)
2734 {
2735 if (!completion_done(&lreq->reg_commit_wait)) {
2736 lreq->reg_commit_error = (result <= 0 ? result : 0);
2737 complete_all(&lreq->reg_commit_wait);
2738 }
2739 }
2740
2741 static void linger_commit_cb(struct ceph_osd_request *req)
2742 {
2743 struct ceph_osd_linger_request *lreq = req->r_priv;
2744
2745 mutex_lock(&lreq->lock);
2746 dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
2747 lreq->linger_id, req->r_result);
2748 linger_reg_commit_complete(lreq, req->r_result);
2749 lreq->committed = true;
2750
2751 if (!lreq->is_watch) {
2752 struct ceph_osd_data *osd_data =
2753 osd_req_op_data(req, 0, notify, response_data);
2754 void *p = page_address(osd_data->pages[0]);
2755
2756 WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
2757 osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
2758
2759 /* make note of the notify_id */
2760 if (req->r_ops[0].outdata_len >= sizeof(u64)) {
2761 lreq->notify_id = ceph_decode_64(&p);
2762 dout("lreq %p notify_id %llu\n", lreq,
2763 lreq->notify_id);
2764 } else {
2765 dout("lreq %p no notify_id\n", lreq);
2766 }
2767 }
2768
2769 mutex_unlock(&lreq->lock);
2770 linger_put(lreq);
2771 }
2772
2773 static int normalize_watch_error(int err)
2774 {
2775 /*
2776 * Translate ENOENT -> ENOTCONN so that a delete->disconnection
2777 * notification and a failure to reconnect because we raced with
2778 * the delete appear the same to the user.
2779 */
2780 if (err == -ENOENT)
2781 err = -ENOTCONN;
2782
2783 return err;
2784 }
2785
2786 static void linger_reconnect_cb(struct ceph_osd_request *req)
2787 {
2788 struct ceph_osd_linger_request *lreq = req->r_priv;
2789
2790 mutex_lock(&lreq->lock);
2791 dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
2792 lreq, lreq->linger_id, req->r_result, lreq->last_error);
2793 if (req->r_result < 0) {
2794 if (!lreq->last_error) {
2795 lreq->last_error = normalize_watch_error(req->r_result);
2796 queue_watch_error(lreq);
2797 }
2798 }
2799
2800 mutex_unlock(&lreq->lock);
2801 linger_put(lreq);
2802 }
2803
2804 static void send_linger(struct ceph_osd_linger_request *lreq)
2805 {
2806 struct ceph_osd_request *req = lreq->reg_req;
2807 struct ceph_osd_req_op *op = &req->r_ops[0];
2808
2809 verify_osdc_wrlocked(req->r_osdc);
2810 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2811
2812 if (req->r_osd)
2813 cancel_linger_request(req);
2814
2815 request_reinit(req);
2816 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
2817 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
2818 req->r_flags = lreq->t.flags;
2819 req->r_mtime = lreq->mtime;
2820
2821 mutex_lock(&lreq->lock);
2822 if (lreq->is_watch && lreq->committed) {
2823 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2824 op->watch.cookie != lreq->linger_id);
2825 op->watch.op = CEPH_OSD_WATCH_OP_RECONNECT;
2826 op->watch.gen = ++lreq->register_gen;
2827 dout("lreq %p reconnect register_gen %u\n", lreq,
2828 op->watch.gen);
2829 req->r_callback = linger_reconnect_cb;
2830 } else {
2831 if (!lreq->is_watch)
2832 lreq->notify_id = 0;
2833 else
2834 WARN_ON(op->watch.op != CEPH_OSD_WATCH_OP_WATCH);
2835 dout("lreq %p register\n", lreq);
2836 req->r_callback = linger_commit_cb;
2837 }
2838 mutex_unlock(&lreq->lock);
2839
2840 req->r_priv = linger_get(lreq);
2841 req->r_linger = true;
2842
2843 submit_request(req, true);
2844 }
2845
2846 static void linger_ping_cb(struct ceph_osd_request *req)
2847 {
2848 struct ceph_osd_linger_request *lreq = req->r_priv;
2849
2850 mutex_lock(&lreq->lock);
2851 dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
2852 __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
2853 lreq->last_error);
2854 if (lreq->register_gen == req->r_ops[0].watch.gen) {
2855 if (!req->r_result) {
2856 lreq->watch_valid_thru = lreq->ping_sent;
2857 } else if (!lreq->last_error) {
2858 lreq->last_error = normalize_watch_error(req->r_result);
2859 queue_watch_error(lreq);
2860 }
2861 } else {
2862 dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
2863 lreq->register_gen, req->r_ops[0].watch.gen);
2864 }
2865
2866 mutex_unlock(&lreq->lock);
2867 linger_put(lreq);
2868 }
2869
2870 static void send_linger_ping(struct ceph_osd_linger_request *lreq)
2871 {
2872 struct ceph_osd_client *osdc = lreq->osdc;
2873 struct ceph_osd_request *req = lreq->ping_req;
2874 struct ceph_osd_req_op *op = &req->r_ops[0];
2875
2876 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2877 dout("%s PAUSERD\n", __func__);
2878 return;
2879 }
2880
2881 lreq->ping_sent = jiffies;
2882 dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
2883 __func__, lreq, lreq->linger_id, lreq->ping_sent,
2884 lreq->register_gen);
2885
2886 if (req->r_osd)
2887 cancel_linger_request(req);
2888
2889 request_reinit(req);
2890 target_copy(&req->r_t, &lreq->t);
2891
2892 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2893 op->watch.cookie != lreq->linger_id ||
2894 op->watch.op != CEPH_OSD_WATCH_OP_PING);
2895 op->watch.gen = lreq->register_gen;
2896 req->r_callback = linger_ping_cb;
2897 req->r_priv = linger_get(lreq);
2898 req->r_linger = true;
2899
2900 ceph_osdc_get_request(req);
2901 account_request(req);
2902 req->r_tid = atomic64_inc_return(&osdc->last_tid);
2903 link_request(lreq->osd, req);
2904 send_request(req);
2905 }
2906
2907 static void linger_submit(struct ceph_osd_linger_request *lreq)
2908 {
2909 struct ceph_osd_client *osdc = lreq->osdc;
2910 struct ceph_osd *osd;
2911
2912 calc_target(osdc, &lreq->t, NULL, false);
2913 osd = lookup_create_osd(osdc, lreq->t.osd, true);
2914 link_linger(osd, lreq);
2915
2916 send_linger(lreq);
2917 }
2918
2919 static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
2920 {
2921 struct ceph_osd_client *osdc = lreq->osdc;
2922 struct ceph_osd_linger_request *lookup_lreq;
2923
2924 verify_osdc_wrlocked(osdc);
2925
2926 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
2927 lreq->linger_id);
2928 if (!lookup_lreq)
2929 return;
2930
2931 WARN_ON(lookup_lreq != lreq);
2932 erase_linger_mc(&osdc->linger_map_checks, lreq);
2933 linger_put(lreq);
2934 }
2935
2936 /*
2937 * @lreq has to be both registered and linked.
2938 */
2939 static void __linger_cancel(struct ceph_osd_linger_request *lreq)
2940 {
2941 if (lreq->is_watch && lreq->ping_req->r_osd)
2942 cancel_linger_request(lreq->ping_req);
2943 if (lreq->reg_req->r_osd)
2944 cancel_linger_request(lreq->reg_req);
2945 cancel_linger_map_check(lreq);
2946 unlink_linger(lreq->osd, lreq);
2947 linger_unregister(lreq);
2948 }
2949
2950 static void linger_cancel(struct ceph_osd_linger_request *lreq)
2951 {
2952 struct ceph_osd_client *osdc = lreq->osdc;
2953
2954 down_write(&osdc->lock);
2955 if (__linger_registered(lreq))
2956 __linger_cancel(lreq);
2957 up_write(&osdc->lock);
2958 }
2959
2960 static void send_linger_map_check(struct ceph_osd_linger_request *lreq);
2961
2962 static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
2963 {
2964 struct ceph_osd_client *osdc = lreq->osdc;
2965 struct ceph_osdmap *map = osdc->osdmap;
2966
2967 verify_osdc_wrlocked(osdc);
2968 WARN_ON(!map->epoch);
2969
2970 if (lreq->register_gen) {
2971 lreq->map_dne_bound = map->epoch;
2972 dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
2973 lreq, lreq->linger_id);
2974 } else {
2975 dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
2976 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
2977 map->epoch);
2978 }
2979
2980 if (lreq->map_dne_bound) {
2981 if (map->epoch >= lreq->map_dne_bound) {
2982 /* we had a new enough map */
2983 pr_info("linger_id %llu pool does not exist\n",
2984 lreq->linger_id);
2985 linger_reg_commit_complete(lreq, -ENOENT);
2986 __linger_cancel(lreq);
2987 }
2988 } else {
2989 send_linger_map_check(lreq);
2990 }
2991 }
2992
2993 static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
2994 {
2995 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2996 struct ceph_osd_linger_request *lreq;
2997 u64 linger_id = greq->private_data;
2998
2999 WARN_ON(greq->result || !greq->u.newest);
3000
3001 down_write(&osdc->lock);
3002 lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
3003 if (!lreq) {
3004 dout("%s linger_id %llu dne\n", __func__, linger_id);
3005 goto out_unlock;
3006 }
3007
3008 dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
3009 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
3010 greq->u.newest);
3011 if (!lreq->map_dne_bound)
3012 lreq->map_dne_bound = greq->u.newest;
3013 erase_linger_mc(&osdc->linger_map_checks, lreq);
3014 check_linger_pool_dne(lreq);
3015
3016 linger_put(lreq);
3017 out_unlock:
3018 up_write(&osdc->lock);
3019 }
3020
3021 static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
3022 {
3023 struct ceph_osd_client *osdc = lreq->osdc;
3024 struct ceph_osd_linger_request *lookup_lreq;
3025 int ret;
3026
3027 verify_osdc_wrlocked(osdc);
3028
3029 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
3030 lreq->linger_id);
3031 if (lookup_lreq) {
3032 WARN_ON(lookup_lreq != lreq);
3033 return;
3034 }
3035
3036 linger_get(lreq);
3037 insert_linger_mc(&osdc->linger_map_checks, lreq);
3038 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
3039 linger_map_check_cb, lreq->linger_id);
3040 WARN_ON(ret);
3041 }
3042
3043 static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
3044 {
3045 int ret;
3046
3047 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3048 ret = wait_for_completion_interruptible(&lreq->reg_commit_wait);
3049 return ret ?: lreq->reg_commit_error;
3050 }
3051
3052 static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq)
3053 {
3054 int ret;
3055
3056 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3057 ret = wait_for_completion_interruptible(&lreq->notify_finish_wait);
3058 return ret ?: lreq->notify_finish_error;
3059 }
3060
3061 /*
3062 * Timeout callback, called every N seconds. When 1 or more OSD
3063 * requests has been active for more than N seconds, we send a keepalive
3064 * (tag + timestamp) to its OSD to ensure any communications channel
3065 * reset is detected.
3066 */
3067 static void handle_timeout(struct work_struct *work)
3068 {
3069 struct ceph_osd_client *osdc =
3070 container_of(work, struct ceph_osd_client, timeout_work.work);
3071 struct ceph_options *opts = osdc->client->options;
3072 unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
3073 unsigned long expiry_cutoff = jiffies - opts->osd_request_timeout;
3074 LIST_HEAD(slow_osds);
3075 struct rb_node *n, *p;
3076
3077 dout("%s osdc %p\n", __func__, osdc);
3078 down_write(&osdc->lock);
3079
3080 /*
3081 * ping osds that are a bit slow. this ensures that if there
3082 * is a break in the TCP connection we will notice, and reopen
3083 * a connection with that osd (from the fault callback).
3084 */
3085 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
3086 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3087 bool found = false;
3088
3089 for (p = rb_first(&osd->o_requests); p; ) {
3090 struct ceph_osd_request *req =
3091 rb_entry(p, struct ceph_osd_request, r_node);
3092
3093 p = rb_next(p); /* abort_request() */
3094
3095 if (time_before(req->r_stamp, cutoff)) {
3096 dout(" req %p tid %llu on osd%d is laggy\n",
3097 req, req->r_tid, osd->o_osd);
3098 found = true;
3099 }
3100 if (opts->osd_request_timeout &&
3101 time_before(req->r_start_stamp, expiry_cutoff)) {
3102 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3103 req->r_tid, osd->o_osd);
3104 abort_request(req, -ETIMEDOUT);
3105 }
3106 }
3107 for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
3108 struct ceph_osd_linger_request *lreq =
3109 rb_entry(p, struct ceph_osd_linger_request, node);
3110
3111 dout(" lreq %p linger_id %llu is served by osd%d\n",
3112 lreq, lreq->linger_id, osd->o_osd);
3113 found = true;
3114
3115 mutex_lock(&lreq->lock);
3116 if (lreq->is_watch && lreq->committed && !lreq->last_error)
3117 send_linger_ping(lreq);
3118 mutex_unlock(&lreq->lock);
3119 }
3120
3121 if (found)
3122 list_move_tail(&osd->o_keepalive_item, &slow_osds);
3123 }
3124
3125 if (opts->osd_request_timeout) {
3126 for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
3127 struct ceph_osd_request *req =
3128 rb_entry(p, struct ceph_osd_request, r_node);
3129
3130 p = rb_next(p); /* abort_request() */
3131
3132 if (time_before(req->r_start_stamp, expiry_cutoff)) {
3133 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3134 req->r_tid, osdc->homeless_osd.o_osd);
3135 abort_request(req, -ETIMEDOUT);
3136 }
3137 }
3138 }
3139
3140 if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
3141 maybe_request_map(osdc);
3142
3143 while (!list_empty(&slow_osds)) {
3144 struct ceph_osd *osd = list_first_entry(&slow_osds,
3145 struct ceph_osd,
3146 o_keepalive_item);
3147 list_del_init(&osd->o_keepalive_item);
3148 ceph_con_keepalive(&osd->o_con);
3149 }
3150
3151 up_write(&osdc->lock);
3152 schedule_delayed_work(&osdc->timeout_work,
3153 osdc->client->options->osd_keepalive_timeout);
3154 }
3155
3156 static void handle_osds_timeout(struct work_struct *work)
3157 {
3158 struct ceph_osd_client *osdc =
3159 container_of(work, struct ceph_osd_client,
3160 osds_timeout_work.work);
3161 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
3162 struct ceph_osd *osd, *nosd;
3163
3164 dout("%s osdc %p\n", __func__, osdc);
3165 down_write(&osdc->lock);
3166 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
3167 if (time_before(jiffies, osd->lru_ttl))
3168 break;
3169
3170 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
3171 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
3172 close_osd(osd);
3173 }
3174
3175 up_write(&osdc->lock);
3176 schedule_delayed_work(&osdc->osds_timeout_work,
3177 round_jiffies_relative(delay));
3178 }
3179
3180 static int ceph_oloc_decode(void **p, void *end,
3181 struct ceph_object_locator *oloc)
3182 {
3183 u8 struct_v, struct_cv;
3184 u32 len;
3185 void *struct_end;
3186 int ret = 0;
3187
3188 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3189 struct_v = ceph_decode_8(p);
3190 struct_cv = ceph_decode_8(p);
3191 if (struct_v < 3) {
3192 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
3193 struct_v, struct_cv);
3194 goto e_inval;
3195 }
3196 if (struct_cv > 6) {
3197 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
3198 struct_v, struct_cv);
3199 goto e_inval;
3200 }
3201 len = ceph_decode_32(p);
3202 ceph_decode_need(p, end, len, e_inval);
3203 struct_end = *p + len;
3204
3205 oloc->pool = ceph_decode_64(p);
3206 *p += 4; /* skip preferred */
3207
3208 len = ceph_decode_32(p);
3209 if (len > 0) {
3210 pr_warn("ceph_object_locator::key is set\n");
3211 goto e_inval;
3212 }
3213
3214 if (struct_v >= 5) {
3215 bool changed = false;
3216
3217 len = ceph_decode_32(p);
3218 if (len > 0) {
3219 ceph_decode_need(p, end, len, e_inval);
3220 if (!oloc->pool_ns ||
3221 ceph_compare_string(oloc->pool_ns, *p, len))
3222 changed = true;
3223 *p += len;
3224 } else {
3225 if (oloc->pool_ns)
3226 changed = true;
3227 }
3228 if (changed) {
3229 /* redirect changes namespace */
3230 pr_warn("ceph_object_locator::nspace is changed\n");
3231 goto e_inval;
3232 }
3233 }
3234
3235 if (struct_v >= 6) {
3236 s64 hash = ceph_decode_64(p);
3237 if (hash != -1) {
3238 pr_warn("ceph_object_locator::hash is set\n");
3239 goto e_inval;
3240 }
3241 }
3242
3243 /* skip the rest */
3244 *p = struct_end;
3245 out:
3246 return ret;
3247
3248 e_inval:
3249 ret = -EINVAL;
3250 goto out;
3251 }
3252
3253 static int ceph_redirect_decode(void **p, void *end,
3254 struct ceph_request_redirect *redir)
3255 {
3256 u8 struct_v, struct_cv;
3257 u32 len;
3258 void *struct_end;
3259 int ret;
3260
3261 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3262 struct_v = ceph_decode_8(p);
3263 struct_cv = ceph_decode_8(p);
3264 if (struct_cv > 1) {
3265 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
3266 struct_v, struct_cv);
3267 goto e_inval;
3268 }
3269 len = ceph_decode_32(p);
3270 ceph_decode_need(p, end, len, e_inval);
3271 struct_end = *p + len;
3272
3273 ret = ceph_oloc_decode(p, end, &redir->oloc);
3274 if (ret)
3275 goto out;
3276
3277 len = ceph_decode_32(p);
3278 if (len > 0) {
3279 pr_warn("ceph_request_redirect::object_name is set\n");
3280 goto e_inval;
3281 }
3282
3283 len = ceph_decode_32(p);
3284 *p += len; /* skip osd_instructions */
3285
3286 /* skip the rest */
3287 *p = struct_end;
3288 out:
3289 return ret;
3290
3291 e_inval:
3292 ret = -EINVAL;
3293 goto out;
3294 }
3295
3296 struct MOSDOpReply {
3297 struct ceph_pg pgid;
3298 u64 flags;
3299 int result;
3300 u32 epoch;
3301 int num_ops;
3302 u32 outdata_len[CEPH_OSD_MAX_OPS];
3303 s32 rval[CEPH_OSD_MAX_OPS];
3304 int retry_attempt;
3305 struct ceph_eversion replay_version;
3306 u64 user_version;
3307 struct ceph_request_redirect redirect;
3308 };
3309
3310 static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
3311 {
3312 void *p = msg->front.iov_base;
3313 void *const end = p + msg->front.iov_len;
3314 u16 version = le16_to_cpu(msg->hdr.version);
3315 struct ceph_eversion bad_replay_version;
3316 u8 decode_redir;
3317 u32 len;
3318 int ret;
3319 int i;
3320
3321 ceph_decode_32_safe(&p, end, len, e_inval);
3322 ceph_decode_need(&p, end, len, e_inval);
3323 p += len; /* skip oid */
3324
3325 ret = ceph_decode_pgid(&p, end, &m->pgid);
3326 if (ret)
3327 return ret;
3328
3329 ceph_decode_64_safe(&p, end, m->flags, e_inval);
3330 ceph_decode_32_safe(&p, end, m->result, e_inval);
3331 ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
3332 memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
3333 p += sizeof(bad_replay_version);
3334 ceph_decode_32_safe(&p, end, m->epoch, e_inval);
3335
3336 ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
3337 if (m->num_ops > ARRAY_SIZE(m->outdata_len))
3338 goto e_inval;
3339
3340 ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
3341 e_inval);
3342 for (i = 0; i < m->num_ops; i++) {
3343 struct ceph_osd_op *op = p;
3344
3345 m->outdata_len[i] = le32_to_cpu(op->payload_len);
3346 p += sizeof(*op);
3347 }
3348
3349 ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
3350 for (i = 0; i < m->num_ops; i++)
3351 ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
3352
3353 if (version >= 5) {
3354 ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
3355 memcpy(&m->replay_version, p, sizeof(m->replay_version));
3356 p += sizeof(m->replay_version);
3357 ceph_decode_64_safe(&p, end, m->user_version, e_inval);
3358 } else {
3359 m->replay_version = bad_replay_version; /* struct */
3360 m->user_version = le64_to_cpu(m->replay_version.version);
3361 }
3362
3363 if (version >= 6) {
3364 if (version >= 7)
3365 ceph_decode_8_safe(&p, end, decode_redir, e_inval);
3366 else
3367 decode_redir = 1;
3368 } else {
3369 decode_redir = 0;
3370 }
3371
3372 if (decode_redir) {
3373 ret = ceph_redirect_decode(&p, end, &m->redirect);
3374 if (ret)
3375 return ret;
3376 } else {
3377 ceph_oloc_init(&m->redirect.oloc);
3378 }
3379
3380 return 0;
3381
3382 e_inval:
3383 return -EINVAL;
3384 }
3385
3386 /*
3387 * Handle MOSDOpReply. Set ->r_result and call the callback if it is
3388 * specified.
3389 */
3390 static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
3391 {
3392 struct ceph_osd_client *osdc = osd->o_osdc;
3393 struct ceph_osd_request *req;
3394 struct MOSDOpReply m;
3395 u64 tid = le64_to_cpu(msg->hdr.tid);
3396 u32 data_len = 0;
3397 int ret;
3398 int i;
3399
3400 dout("%s msg %p tid %llu\n", __func__, msg, tid);
3401
3402 down_read(&osdc->lock);
3403 if (!osd_registered(osd)) {
3404 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3405 goto out_unlock_osdc;
3406 }
3407 WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
3408
3409 mutex_lock(&osd->lock);
3410 req = lookup_request(&osd->o_requests, tid);
3411 if (!req) {
3412 dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
3413 goto out_unlock_session;
3414 }
3415
3416 m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
3417 ret = decode_MOSDOpReply(msg, &m);
3418 m.redirect.oloc.pool_ns = NULL;
3419 if (ret) {
3420 pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
3421 req->r_tid, ret);
3422 ceph_msg_dump(msg);
3423 goto fail_request;
3424 }
3425 dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
3426 __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
3427 m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
3428 le64_to_cpu(m.replay_version.version), m.user_version);
3429
3430 if (m.retry_attempt >= 0) {
3431 if (m.retry_attempt != req->r_attempts - 1) {
3432 dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
3433 req, req->r_tid, m.retry_attempt,
3434 req->r_attempts - 1);
3435 goto out_unlock_session;
3436 }
3437 } else {
3438 WARN_ON(1); /* MOSDOpReply v4 is assumed */
3439 }
3440
3441 if (!ceph_oloc_empty(&m.redirect.oloc)) {
3442 dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
3443 m.redirect.oloc.pool);
3444 unlink_request(osd, req);
3445 mutex_unlock(&osd->lock);
3446
3447 /*
3448 * Not ceph_oloc_copy() - changing pool_ns is not
3449 * supported.
3450 */
3451 req->r_t.target_oloc.pool = m.redirect.oloc.pool;
3452 req->r_flags |= CEPH_OSD_FLAG_REDIRECTED;
3453 req->r_tid = 0;
3454 __submit_request(req, false);
3455 goto out_unlock_osdc;
3456 }
3457
3458 if (m.num_ops != req->r_num_ops) {
3459 pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
3460 req->r_num_ops, req->r_tid);
3461 goto fail_request;
3462 }
3463 for (i = 0; i < req->r_num_ops; i++) {
3464 dout(" req %p tid %llu op %d rval %d len %u\n", req,
3465 req->r_tid, i, m.rval[i], m.outdata_len[i]);
3466 req->r_ops[i].rval = m.rval[i];
3467 req->r_ops[i].outdata_len = m.outdata_len[i];
3468 data_len += m.outdata_len[i];
3469 }
3470 if (data_len != le32_to_cpu(msg->hdr.data_len)) {
3471 pr_err("sum of lens %u != %u for tid %llu\n", data_len,
3472 le32_to_cpu(msg->hdr.data_len), req->r_tid);
3473 goto fail_request;
3474 }
3475 dout("%s req %p tid %llu result %d data_len %u\n", __func__,
3476 req, req->r_tid, m.result, data_len);
3477
3478 /*
3479 * Since we only ever request ONDISK, we should only ever get
3480 * one (type of) reply back.
3481 */
3482 WARN_ON(!(m.flags & CEPH_OSD_FLAG_ONDISK));
3483 req->r_result = m.result ?: data_len;
3484 finish_request(req);
3485 mutex_unlock(&osd->lock);
3486 up_read(&osdc->lock);
3487
3488 __complete_request(req);
3489 complete_all(&req->r_completion);
3490 ceph_osdc_put_request(req);
3491 return;
3492
3493 fail_request:
3494 complete_request(req, -EIO);
3495 out_unlock_session:
3496 mutex_unlock(&osd->lock);
3497 out_unlock_osdc:
3498 up_read(&osdc->lock);
3499 }
3500
3501 static void set_pool_was_full(struct ceph_osd_client *osdc)
3502 {
3503 struct rb_node *n;
3504
3505 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
3506 struct ceph_pg_pool_info *pi =
3507 rb_entry(n, struct ceph_pg_pool_info, node);
3508
3509 pi->was_full = __pool_full(pi);
3510 }
3511 }
3512
3513 static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
3514 {
3515 struct ceph_pg_pool_info *pi;
3516
3517 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
3518 if (!pi)
3519 return false;
3520
3521 return pi->was_full && !__pool_full(pi);
3522 }
3523
3524 static enum calc_target_result
3525 recalc_linger_target(struct ceph_osd_linger_request *lreq)
3526 {
3527 struct ceph_osd_client *osdc = lreq->osdc;
3528 enum calc_target_result ct_res;
3529
3530 ct_res = calc_target(osdc, &lreq->t, NULL, true);
3531 if (ct_res == CALC_TARGET_NEED_RESEND) {
3532 struct ceph_osd *osd;
3533
3534 osd = lookup_create_osd(osdc, lreq->t.osd, true);
3535 if (osd != lreq->osd) {
3536 unlink_linger(lreq->osd, lreq);
3537 link_linger(osd, lreq);
3538 }
3539 }
3540
3541 return ct_res;
3542 }
3543
3544 /*
3545 * Requeue requests whose mapping to an OSD has changed.
3546 */
3547 static void scan_requests(struct ceph_osd *osd,
3548 bool force_resend,
3549 bool cleared_full,
3550 bool check_pool_cleared_full,
3551 struct rb_root *need_resend,
3552 struct list_head *need_resend_linger)
3553 {
3554 struct ceph_osd_client *osdc = osd->o_osdc;
3555 struct rb_node *n;
3556 bool force_resend_writes;
3557
3558 for (n = rb_first(&osd->o_linger_requests); n; ) {
3559 struct ceph_osd_linger_request *lreq =
3560 rb_entry(n, struct ceph_osd_linger_request, node);
3561 enum calc_target_result ct_res;
3562
3563 n = rb_next(n); /* recalc_linger_target() */
3564
3565 dout("%s lreq %p linger_id %llu\n", __func__, lreq,
3566 lreq->linger_id);
3567 ct_res = recalc_linger_target(lreq);
3568 switch (ct_res) {
3569 case CALC_TARGET_NO_ACTION:
3570 force_resend_writes = cleared_full ||
3571 (check_pool_cleared_full &&
3572 pool_cleared_full(osdc, lreq->t.base_oloc.pool));
3573 if (!force_resend && !force_resend_writes)
3574 break;
3575
3576 /* fall through */
3577 case CALC_TARGET_NEED_RESEND:
3578 cancel_linger_map_check(lreq);
3579 /*
3580 * scan_requests() for the previous epoch(s)
3581 * may have already added it to the list, since
3582 * it's not unlinked here.
3583 */
3584 if (list_empty(&lreq->scan_item))
3585 list_add_tail(&lreq->scan_item, need_resend_linger);
3586 break;
3587 case CALC_TARGET_POOL_DNE:
3588 list_del_init(&lreq->scan_item);
3589 check_linger_pool_dne(lreq);
3590 break;
3591 }
3592 }
3593
3594 for (n = rb_first(&osd->o_requests); n; ) {
3595 struct ceph_osd_request *req =
3596 rb_entry(n, struct ceph_osd_request, r_node);
3597 enum calc_target_result ct_res;
3598
3599 n = rb_next(n); /* unlink_request(), check_pool_dne() */
3600
3601 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3602 ct_res = calc_target(osdc, &req->r_t, &req->r_osd->o_con,
3603 false);
3604 switch (ct_res) {
3605 case CALC_TARGET_NO_ACTION:
3606 force_resend_writes = cleared_full ||
3607 (check_pool_cleared_full &&
3608 pool_cleared_full(osdc, req->r_t.base_oloc.pool));
3609 if (!force_resend &&
3610 (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
3611 !force_resend_writes))
3612 break;
3613
3614 /* fall through */
3615 case CALC_TARGET_NEED_RESEND:
3616 cancel_map_check(req);
3617 unlink_request(osd, req);
3618 insert_request(need_resend, req);
3619 break;
3620 case CALC_TARGET_POOL_DNE:
3621 check_pool_dne(req);
3622 break;
3623 }
3624 }
3625 }
3626
3627 static int handle_one_map(struct ceph_osd_client *osdc,
3628 void *p, void *end, bool incremental,
3629 struct rb_root *need_resend,
3630 struct list_head *need_resend_linger)
3631 {
3632 struct ceph_osdmap *newmap;
3633 struct rb_node *n;
3634 bool skipped_map = false;
3635 bool was_full;
3636
3637 was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3638 set_pool_was_full(osdc);
3639
3640 if (incremental)
3641 newmap = osdmap_apply_incremental(&p, end, osdc->osdmap);
3642 else
3643 newmap = ceph_osdmap_decode(&p, end);
3644 if (IS_ERR(newmap))
3645 return PTR_ERR(newmap);
3646
3647 if (newmap != osdc->osdmap) {
3648 /*
3649 * Preserve ->was_full before destroying the old map.
3650 * For pools that weren't in the old map, ->was_full
3651 * should be false.
3652 */
3653 for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
3654 struct ceph_pg_pool_info *pi =
3655 rb_entry(n, struct ceph_pg_pool_info, node);
3656 struct ceph_pg_pool_info *old_pi;
3657
3658 old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
3659 if (old_pi)
3660 pi->was_full = old_pi->was_full;
3661 else
3662 WARN_ON(pi->was_full);
3663 }
3664
3665 if (osdc->osdmap->epoch &&
3666 osdc->osdmap->epoch + 1 < newmap->epoch) {
3667 WARN_ON(incremental);
3668 skipped_map = true;
3669 }
3670
3671 ceph_osdmap_destroy(osdc->osdmap);
3672 osdc->osdmap = newmap;
3673 }
3674
3675 was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3676 scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
3677 need_resend, need_resend_linger);
3678
3679 for (n = rb_first(&osdc->osds); n; ) {
3680 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3681
3682 n = rb_next(n); /* close_osd() */
3683
3684 scan_requests(osd, skipped_map, was_full, true, need_resend,
3685 need_resend_linger);
3686 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
3687 memcmp(&osd->o_con.peer_addr,
3688 ceph_osd_addr(osdc->osdmap, osd->o_osd),
3689 sizeof(struct ceph_entity_addr)))
3690 close_osd(osd);
3691 }
3692
3693 return 0;
3694 }
3695
3696 static void kick_requests(struct ceph_osd_client *osdc,
3697 struct rb_root *need_resend,
3698 struct list_head *need_resend_linger)
3699 {
3700 struct ceph_osd_linger_request *lreq, *nlreq;
3701 enum calc_target_result ct_res;
3702 struct rb_node *n;
3703
3704 /* make sure need_resend targets reflect latest map */
3705 for (n = rb_first(need_resend); n; ) {
3706 struct ceph_osd_request *req =
3707 rb_entry(n, struct ceph_osd_request, r_node);
3708
3709 n = rb_next(n);
3710
3711 if (req->r_t.epoch < osdc->osdmap->epoch) {
3712 ct_res = calc_target(osdc, &req->r_t, NULL, false);
3713 if (ct_res == CALC_TARGET_POOL_DNE) {
3714 erase_request(need_resend, req);
3715 check_pool_dne(req);
3716 }
3717 }
3718 }
3719
3720 for (n = rb_first(need_resend); n; ) {
3721 struct ceph_osd_request *req =
3722 rb_entry(n, struct ceph_osd_request, r_node);
3723 struct ceph_osd *osd;
3724
3725 n = rb_next(n);
3726 erase_request(need_resend, req); /* before link_request() */
3727
3728 osd = lookup_create_osd(osdc, req->r_t.osd, true);
3729 link_request(osd, req);
3730 if (!req->r_linger) {
3731 if (!osd_homeless(osd) && !req->r_t.paused)
3732 send_request(req);
3733 } else {
3734 cancel_linger_request(req);
3735 }
3736 }
3737
3738 list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
3739 if (!osd_homeless(lreq->osd))
3740 send_linger(lreq);
3741
3742 list_del_init(&lreq->scan_item);
3743 }
3744 }
3745
3746 /*
3747 * Process updated osd map.
3748 *
3749 * The message contains any number of incremental and full maps, normally
3750 * indicating some sort of topology change in the cluster. Kick requests
3751 * off to different OSDs as needed.
3752 */
3753 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
3754 {
3755 void *p = msg->front.iov_base;
3756 void *const end = p + msg->front.iov_len;
3757 u32 nr_maps, maplen;
3758 u32 epoch;
3759 struct ceph_fsid fsid;
3760 struct rb_root need_resend = RB_ROOT;
3761 LIST_HEAD(need_resend_linger);
3762 bool handled_incremental = false;
3763 bool was_pauserd, was_pausewr;
3764 bool pauserd, pausewr;
3765 int err;
3766
3767 dout("%s have %u\n", __func__, osdc->osdmap->epoch);
3768 down_write(&osdc->lock);
3769
3770 /* verify fsid */
3771 ceph_decode_need(&p, end, sizeof(fsid), bad);
3772 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3773 if (ceph_check_fsid(osdc->client, &fsid) < 0)
3774 goto bad;
3775
3776 was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3777 was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3778 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3779 have_pool_full(osdc);
3780
3781 /* incremental maps */
3782 ceph_decode_32_safe(&p, end, nr_maps, bad);
3783 dout(" %d inc maps\n", nr_maps);
3784 while (nr_maps > 0) {
3785 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3786 epoch = ceph_decode_32(&p);
3787 maplen = ceph_decode_32(&p);
3788 ceph_decode_need(&p, end, maplen, bad);
3789 if (osdc->osdmap->epoch &&
3790 osdc->osdmap->epoch + 1 == epoch) {
3791 dout("applying incremental map %u len %d\n",
3792 epoch, maplen);
3793 err = handle_one_map(osdc, p, p + maplen, true,
3794 &need_resend, &need_resend_linger);
3795 if (err)
3796 goto bad;
3797 handled_incremental = true;
3798 } else {
3799 dout("ignoring incremental map %u len %d\n",
3800 epoch, maplen);
3801 }
3802 p += maplen;
3803 nr_maps--;
3804 }
3805 if (handled_incremental)
3806 goto done;
3807
3808 /* full maps */
3809 ceph_decode_32_safe(&p, end, nr_maps, bad);
3810 dout(" %d full maps\n", nr_maps);
3811 while (nr_maps) {
3812 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3813 epoch = ceph_decode_32(&p);
3814 maplen = ceph_decode_32(&p);
3815 ceph_decode_need(&p, end, maplen, bad);
3816 if (nr_maps > 1) {
3817 dout("skipping non-latest full map %u len %d\n",
3818 epoch, maplen);
3819 } else if (osdc->osdmap->epoch >= epoch) {
3820 dout("skipping full map %u len %d, "
3821 "older than our %u\n", epoch, maplen,
3822 osdc->osdmap->epoch);
3823 } else {
3824 dout("taking full map %u len %d\n", epoch, maplen);
3825 err = handle_one_map(osdc, p, p + maplen, false,
3826 &need_resend, &need_resend_linger);
3827 if (err)
3828 goto bad;
3829 }
3830 p += maplen;
3831 nr_maps--;
3832 }
3833
3834 done:
3835 /*
3836 * subscribe to subsequent osdmap updates if full to ensure
3837 * we find out when we are no longer full and stop returning
3838 * ENOSPC.
3839 */
3840 pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3841 pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3842 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3843 have_pool_full(osdc);
3844 if (was_pauserd || was_pausewr || pauserd || pausewr ||
3845 osdc->osdmap->epoch < osdc->epoch_barrier)
3846 maybe_request_map(osdc);
3847
3848 kick_requests(osdc, &need_resend, &need_resend_linger);
3849
3850 ceph_osdc_abort_on_full(osdc);
3851 ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
3852 osdc->osdmap->epoch);
3853 up_write(&osdc->lock);
3854 wake_up_all(&osdc->client->auth_wq);
3855 return;
3856
3857 bad:
3858 pr_err("osdc handle_map corrupt msg\n");
3859 ceph_msg_dump(msg);
3860 up_write(&osdc->lock);
3861 }
3862
3863 /*
3864 * Resubmit requests pending on the given osd.
3865 */
3866 static void kick_osd_requests(struct ceph_osd *osd)
3867 {
3868 struct rb_node *n;
3869
3870 clear_backoffs(osd);
3871
3872 for (n = rb_first(&osd->o_requests); n; ) {
3873 struct ceph_osd_request *req =
3874 rb_entry(n, struct ceph_osd_request, r_node);
3875
3876 n = rb_next(n); /* cancel_linger_request() */
3877
3878 if (!req->r_linger) {
3879 if (!req->r_t.paused)
3880 send_request(req);
3881 } else {
3882 cancel_linger_request(req);
3883 }
3884 }
3885 for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
3886 struct ceph_osd_linger_request *lreq =
3887 rb_entry(n, struct ceph_osd_linger_request, node);
3888
3889 send_linger(lreq);
3890 }
3891 }
3892
3893 /*
3894 * If the osd connection drops, we need to resubmit all requests.
3895 */
3896 static void osd_fault(struct ceph_connection *con)
3897 {
3898 struct ceph_osd *osd = con->private;
3899 struct ceph_osd_client *osdc = osd->o_osdc;
3900
3901 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
3902
3903 down_write(&osdc->lock);
3904 if (!osd_registered(osd)) {
3905 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3906 goto out_unlock;
3907 }
3908
3909 if (!reopen_osd(osd))
3910 kick_osd_requests(osd);
3911 maybe_request_map(osdc);
3912
3913 out_unlock:
3914 up_write(&osdc->lock);
3915 }
3916
3917 struct MOSDBackoff {
3918 struct ceph_spg spgid;
3919 u32 map_epoch;
3920 u8 op;
3921 u64 id;
3922 struct ceph_hobject_id *begin;
3923 struct ceph_hobject_id *end;
3924 };
3925
3926 static int decode_MOSDBackoff(const struct ceph_msg *msg, struct MOSDBackoff *m)
3927 {
3928 void *p = msg->front.iov_base;
3929 void *const end = p + msg->front.iov_len;
3930 u8 struct_v;
3931 u32 struct_len;
3932 int ret;
3933
3934 ret = ceph_start_decoding(&p, end, 1, "spg_t", &struct_v, &struct_len);
3935 if (ret)
3936 return ret;
3937
3938 ret = ceph_decode_pgid(&p, end, &m->spgid.pgid);
3939 if (ret)
3940 return ret;
3941
3942 ceph_decode_8_safe(&p, end, m->spgid.shard, e_inval);
3943 ceph_decode_32_safe(&p, end, m->map_epoch, e_inval);
3944 ceph_decode_8_safe(&p, end, m->op, e_inval);
3945 ceph_decode_64_safe(&p, end, m->id, e_inval);
3946
3947 m->begin = kzalloc(sizeof(*m->begin), GFP_NOIO);
3948 if (!m->begin)
3949 return -ENOMEM;
3950
3951 ret = decode_hoid(&p, end, m->begin);
3952 if (ret) {
3953 free_hoid(m->begin);
3954 return ret;
3955 }
3956
3957 m->end = kzalloc(sizeof(*m->end), GFP_NOIO);
3958 if (!m->end) {
3959 free_hoid(m->begin);
3960 return -ENOMEM;
3961 }
3962
3963 ret = decode_hoid(&p, end, m->end);
3964 if (ret) {
3965 free_hoid(m->begin);
3966 free_hoid(m->end);
3967 return ret;
3968 }
3969
3970 return 0;
3971
3972 e_inval:
3973 return -EINVAL;
3974 }
3975
3976 static struct ceph_msg *create_backoff_message(
3977 const struct ceph_osd_backoff *backoff,
3978 u32 map_epoch)
3979 {
3980 struct ceph_msg *msg;
3981 void *p, *end;
3982 int msg_size;
3983
3984 msg_size = CEPH_ENCODING_START_BLK_LEN +
3985 CEPH_PGID_ENCODING_LEN + 1; /* spgid */
3986 msg_size += 4 + 1 + 8; /* map_epoch, op, id */
3987 msg_size += CEPH_ENCODING_START_BLK_LEN +
3988 hoid_encoding_size(backoff->begin);
3989 msg_size += CEPH_ENCODING_START_BLK_LEN +
3990 hoid_encoding_size(backoff->end);
3991
3992 msg = ceph_msg_new(CEPH_MSG_OSD_BACKOFF, msg_size, GFP_NOIO, true);
3993 if (!msg)
3994 return NULL;
3995
3996 p = msg->front.iov_base;
3997 end = p + msg->front_alloc_len;
3998
3999 encode_spgid(&p, &backoff->spgid);
4000 ceph_encode_32(&p, map_epoch);
4001 ceph_encode_8(&p, CEPH_OSD_BACKOFF_OP_ACK_BLOCK);
4002 ceph_encode_64(&p, backoff->id);
4003 encode_hoid(&p, end, backoff->begin);
4004 encode_hoid(&p, end, backoff->end);
4005 BUG_ON(p != end);
4006
4007 msg->front.iov_len = p - msg->front.iov_base;
4008 msg->hdr.version = cpu_to_le16(1); /* MOSDBackoff v1 */
4009 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
4010
4011 return msg;
4012 }
4013
4014 static void handle_backoff_block(struct ceph_osd *osd, struct MOSDBackoff *m)
4015 {
4016 struct ceph_spg_mapping *spg;
4017 struct ceph_osd_backoff *backoff;
4018 struct ceph_msg *msg;
4019
4020 dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4021 m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4022
4023 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &m->spgid);
4024 if (!spg) {
4025 spg = alloc_spg_mapping();
4026 if (!spg) {
4027 pr_err("%s failed to allocate spg\n", __func__);
4028 return;
4029 }
4030 spg->spgid = m->spgid; /* struct */
4031 insert_spg_mapping(&osd->o_backoff_mappings, spg);
4032 }
4033
4034 backoff = alloc_backoff();
4035 if (!backoff) {
4036 pr_err("%s failed to allocate backoff\n", __func__);
4037 return;
4038 }
4039 backoff->spgid = m->spgid; /* struct */
4040 backoff->id = m->id;
4041 backoff->begin = m->begin;
4042 m->begin = NULL; /* backoff now owns this */
4043 backoff->end = m->end;
4044 m->end = NULL; /* ditto */
4045
4046 insert_backoff(&spg->backoffs, backoff);
4047 insert_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4048
4049 /*
4050 * Ack with original backoff's epoch so that the OSD can
4051 * discard this if there was a PG split.
4052 */
4053 msg = create_backoff_message(backoff, m->map_epoch);
4054 if (!msg) {
4055 pr_err("%s failed to allocate msg\n", __func__);
4056 return;
4057 }
4058 ceph_con_send(&osd->o_con, msg);
4059 }
4060
4061 static bool target_contained_by(const struct ceph_osd_request_target *t,
4062 const struct ceph_hobject_id *begin,
4063 const struct ceph_hobject_id *end)
4064 {
4065 struct ceph_hobject_id hoid;
4066 int cmp;
4067
4068 hoid_fill_from_target(&hoid, t);
4069 cmp = hoid_compare(&hoid, begin);
4070 return !cmp || (cmp > 0 && hoid_compare(&hoid, end) < 0);
4071 }
4072
4073 static void handle_backoff_unblock(struct ceph_osd *osd,
4074 const struct MOSDBackoff *m)
4075 {
4076 struct ceph_spg_mapping *spg;
4077 struct ceph_osd_backoff *backoff;
4078 struct rb_node *n;
4079
4080 dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4081 m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4082
4083 backoff = lookup_backoff_by_id(&osd->o_backoffs_by_id, m->id);
4084 if (!backoff) {
4085 pr_err("%s osd%d spgid %llu.%xs%d id %llu backoff dne\n",
4086 __func__, osd->o_osd, m->spgid.pgid.pool,
4087 m->spgid.pgid.seed, m->spgid.shard, m->id);
4088 return;
4089 }
4090
4091 if (hoid_compare(backoff->begin, m->begin) &&
4092 hoid_compare(backoff->end, m->end)) {
4093 pr_err("%s osd%d spgid %llu.%xs%d id %llu bad range?\n",
4094 __func__, osd->o_osd, m->spgid.pgid.pool,
4095 m->spgid.pgid.seed, m->spgid.shard, m->id);
4096 /* unblock it anyway... */
4097 }
4098
4099 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &backoff->spgid);
4100 BUG_ON(!spg);
4101
4102 erase_backoff(&spg->backoffs, backoff);
4103 erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4104 free_backoff(backoff);
4105
4106 if (RB_EMPTY_ROOT(&spg->backoffs)) {
4107 erase_spg_mapping(&osd->o_backoff_mappings, spg);
4108 free_spg_mapping(spg);
4109 }
4110
4111 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
4112 struct ceph_osd_request *req =
4113 rb_entry(n, struct ceph_osd_request, r_node);
4114
4115 if (!ceph_spg_compare(&req->r_t.spgid, &m->spgid)) {
4116 /*
4117 * Match against @m, not @backoff -- the PG may
4118 * have split on the OSD.
4119 */
4120 if (target_contained_by(&req->r_t, m->begin, m->end)) {
4121 /*
4122 * If no other installed backoff applies,
4123 * resend.
4124 */
4125 send_request(req);
4126 }
4127 }
4128 }
4129 }
4130
4131 static void handle_backoff(struct ceph_osd *osd, struct ceph_msg *msg)
4132 {
4133 struct ceph_osd_client *osdc = osd->o_osdc;
4134 struct MOSDBackoff m;
4135 int ret;
4136
4137 down_read(&osdc->lock);
4138 if (!osd_registered(osd)) {
4139 dout("%s osd%d unknown\n", __func__, osd->o_osd);
4140 up_read(&osdc->lock);
4141 return;
4142 }
4143 WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
4144
4145 mutex_lock(&osd->lock);
4146 ret = decode_MOSDBackoff(msg, &m);
4147 if (ret) {
4148 pr_err("failed to decode MOSDBackoff: %d\n", ret);
4149 ceph_msg_dump(msg);
4150 goto out_unlock;
4151 }
4152
4153 switch (m.op) {
4154 case CEPH_OSD_BACKOFF_OP_BLOCK:
4155 handle_backoff_block(osd, &m);
4156 break;
4157 case CEPH_OSD_BACKOFF_OP_UNBLOCK:
4158 handle_backoff_unblock(osd, &m);
4159 break;
4160 default:
4161 pr_err("%s osd%d unknown op %d\n", __func__, osd->o_osd, m.op);
4162 }
4163
4164 free_hoid(m.begin);
4165 free_hoid(m.end);
4166
4167 out_unlock:
4168 mutex_unlock(&osd->lock);
4169 up_read(&osdc->lock);
4170 }
4171
4172 /*
4173 * Process osd watch notifications
4174 */
4175 static void handle_watch_notify(struct ceph_osd_client *osdc,
4176 struct ceph_msg *msg)
4177 {
4178 void *p = msg->front.iov_base;
4179 void *const end = p + msg->front.iov_len;
4180 struct ceph_osd_linger_request *lreq;
4181 struct linger_work *lwork;
4182 u8 proto_ver, opcode;
4183 u64 cookie, notify_id;
4184 u64 notifier_id = 0;
4185 s32 return_code = 0;
4186 void *payload = NULL;
4187 u32 payload_len = 0;
4188
4189 ceph_decode_8_safe(&p, end, proto_ver, bad);
4190 ceph_decode_8_safe(&p, end, opcode, bad);
4191 ceph_decode_64_safe(&p, end, cookie, bad);
4192 p += 8; /* skip ver */
4193 ceph_decode_64_safe(&p, end, notify_id, bad);
4194
4195 if (proto_ver >= 1) {
4196 ceph_decode_32_safe(&p, end, payload_len, bad);
4197 ceph_decode_need(&p, end, payload_len, bad);
4198 payload = p;
4199 p += payload_len;
4200 }
4201
4202 if (le16_to_cpu(msg->hdr.version) >= 2)
4203 ceph_decode_32_safe(&p, end, return_code, bad);
4204
4205 if (le16_to_cpu(msg->hdr.version) >= 3)
4206 ceph_decode_64_safe(&p, end, notifier_id, bad);
4207
4208 down_read(&osdc->lock);
4209 lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
4210 if (!lreq) {
4211 dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
4212 cookie);
4213 goto out_unlock_osdc;
4214 }
4215
4216 mutex_lock(&lreq->lock);
4217 dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
4218 opcode, cookie, lreq, lreq->is_watch);
4219 if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
4220 if (!lreq->last_error) {
4221 lreq->last_error = -ENOTCONN;
4222 queue_watch_error(lreq);
4223 }
4224 } else if (!lreq->is_watch) {
4225 /* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
4226 if (lreq->notify_id && lreq->notify_id != notify_id) {
4227 dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
4228 lreq->notify_id, notify_id);
4229 } else if (!completion_done(&lreq->notify_finish_wait)) {
4230 struct ceph_msg_data *data =
4231 list_first_entry_or_null(&msg->data,
4232 struct ceph_msg_data,
4233 links);
4234
4235 if (data) {
4236 if (lreq->preply_pages) {
4237 WARN_ON(data->type !=
4238 CEPH_MSG_DATA_PAGES);
4239 *lreq->preply_pages = data->pages;
4240 *lreq->preply_len = data->length;
4241 } else {
4242 ceph_release_page_vector(data->pages,
4243 calc_pages_for(0, data->length));
4244 }
4245 }
4246 lreq->notify_finish_error = return_code;
4247 complete_all(&lreq->notify_finish_wait);
4248 }
4249 } else {
4250 /* CEPH_WATCH_EVENT_NOTIFY */
4251 lwork = lwork_alloc(lreq, do_watch_notify);
4252 if (!lwork) {
4253 pr_err("failed to allocate notify-lwork\n");
4254 goto out_unlock_lreq;
4255 }
4256
4257 lwork->notify.notify_id = notify_id;
4258 lwork->notify.notifier_id = notifier_id;
4259 lwork->notify.payload = payload;
4260 lwork->notify.payload_len = payload_len;
4261 lwork->notify.msg = ceph_msg_get(msg);
4262 lwork_queue(lwork);
4263 }
4264
4265 out_unlock_lreq:
4266 mutex_unlock(&lreq->lock);
4267 out_unlock_osdc:
4268 up_read(&osdc->lock);
4269 return;
4270
4271 bad:
4272 pr_err("osdc handle_watch_notify corrupt msg\n");
4273 }
4274
4275 /*
4276 * Register request, send initial attempt.
4277 */
4278 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
4279 struct ceph_osd_request *req,
4280 bool nofail)
4281 {
4282 down_read(&osdc->lock);
4283 submit_request(req, false);
4284 up_read(&osdc->lock);
4285
4286 return 0;
4287 }
4288 EXPORT_SYMBOL(ceph_osdc_start_request);
4289
4290 /*
4291 * Unregister a registered request. The request is not completed:
4292 * ->r_result isn't set and __complete_request() isn't called.
4293 */
4294 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
4295 {
4296 struct ceph_osd_client *osdc = req->r_osdc;
4297
4298 down_write(&osdc->lock);
4299 if (req->r_osd)
4300 cancel_request(req);
4301 up_write(&osdc->lock);
4302 }
4303 EXPORT_SYMBOL(ceph_osdc_cancel_request);
4304
4305 /*
4306 * @timeout: in jiffies, 0 means "wait forever"
4307 */
4308 static int wait_request_timeout(struct ceph_osd_request *req,
4309 unsigned long timeout)
4310 {
4311 long left;
4312
4313 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
4314 left = wait_for_completion_killable_timeout(&req->r_completion,
4315 ceph_timeout_jiffies(timeout));
4316 if (left <= 0) {
4317 left = left ?: -ETIMEDOUT;
4318 ceph_osdc_cancel_request(req);
4319 } else {
4320 left = req->r_result; /* completed */
4321 }
4322
4323 return left;
4324 }
4325
4326 /*
4327 * wait for a request to complete
4328 */
4329 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
4330 struct ceph_osd_request *req)
4331 {
4332 return wait_request_timeout(req, 0);
4333 }
4334 EXPORT_SYMBOL(ceph_osdc_wait_request);
4335
4336 /*
4337 * sync - wait for all in-flight requests to flush. avoid starvation.
4338 */
4339 void ceph_osdc_sync(struct ceph_osd_client *osdc)
4340 {
4341 struct rb_node *n, *p;
4342 u64 last_tid = atomic64_read(&osdc->last_tid);
4343
4344 again:
4345 down_read(&osdc->lock);
4346 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
4347 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
4348
4349 mutex_lock(&osd->lock);
4350 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
4351 struct ceph_osd_request *req =
4352 rb_entry(p, struct ceph_osd_request, r_node);
4353
4354 if (req->r_tid > last_tid)
4355 break;
4356
4357 if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
4358 continue;
4359
4360 ceph_osdc_get_request(req);
4361 mutex_unlock(&osd->lock);
4362 up_read(&osdc->lock);
4363 dout("%s waiting on req %p tid %llu last_tid %llu\n",
4364 __func__, req, req->r_tid, last_tid);
4365 wait_for_completion(&req->r_completion);
4366 ceph_osdc_put_request(req);
4367 goto again;
4368 }
4369
4370 mutex_unlock(&osd->lock);
4371 }
4372
4373 up_read(&osdc->lock);
4374 dout("%s done last_tid %llu\n", __func__, last_tid);
4375 }
4376 EXPORT_SYMBOL(ceph_osdc_sync);
4377
4378 static struct ceph_osd_request *
4379 alloc_linger_request(struct ceph_osd_linger_request *lreq)
4380 {
4381 struct ceph_osd_request *req;
4382
4383 req = ceph_osdc_alloc_request(lreq->osdc, NULL, 1, false, GFP_NOIO);
4384 if (!req)
4385 return NULL;
4386
4387 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4388 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4389
4390 if (ceph_osdc_alloc_messages(req, GFP_NOIO)) {
4391 ceph_osdc_put_request(req);
4392 return NULL;
4393 }
4394
4395 return req;
4396 }
4397
4398 /*
4399 * Returns a handle, caller owns a ref.
4400 */
4401 struct ceph_osd_linger_request *
4402 ceph_osdc_watch(struct ceph_osd_client *osdc,
4403 struct ceph_object_id *oid,
4404 struct ceph_object_locator *oloc,
4405 rados_watchcb2_t wcb,
4406 rados_watcherrcb_t errcb,
4407 void *data)
4408 {
4409 struct ceph_osd_linger_request *lreq;
4410 int ret;
4411
4412 lreq = linger_alloc(osdc);
4413 if (!lreq)
4414 return ERR_PTR(-ENOMEM);
4415
4416 lreq->is_watch = true;
4417 lreq->wcb = wcb;
4418 lreq->errcb = errcb;
4419 lreq->data = data;
4420 lreq->watch_valid_thru = jiffies;
4421
4422 ceph_oid_copy(&lreq->t.base_oid, oid);
4423 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4424 lreq->t.flags = CEPH_OSD_FLAG_WRITE;
4425 ktime_get_real_ts(&lreq->mtime);
4426
4427 lreq->reg_req = alloc_linger_request(lreq);
4428 if (!lreq->reg_req) {
4429 ret = -ENOMEM;
4430 goto err_put_lreq;
4431 }
4432
4433 lreq->ping_req = alloc_linger_request(lreq);
4434 if (!lreq->ping_req) {
4435 ret = -ENOMEM;
4436 goto err_put_lreq;
4437 }
4438
4439 down_write(&osdc->lock);
4440 linger_register(lreq); /* before osd_req_op_* */
4441 osd_req_op_watch_init(lreq->reg_req, 0, lreq->linger_id,
4442 CEPH_OSD_WATCH_OP_WATCH);
4443 osd_req_op_watch_init(lreq->ping_req, 0, lreq->linger_id,
4444 CEPH_OSD_WATCH_OP_PING);
4445 linger_submit(lreq);
4446 up_write(&osdc->lock);
4447
4448 ret = linger_reg_commit_wait(lreq);
4449 if (ret) {
4450 linger_cancel(lreq);
4451 goto err_put_lreq;
4452 }
4453
4454 return lreq;
4455
4456 err_put_lreq:
4457 linger_put(lreq);
4458 return ERR_PTR(ret);
4459 }
4460 EXPORT_SYMBOL(ceph_osdc_watch);
4461
4462 /*
4463 * Releases a ref.
4464 *
4465 * Times out after mount_timeout to preserve rbd unmap behaviour
4466 * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
4467 * with mount_timeout").
4468 */
4469 int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
4470 struct ceph_osd_linger_request *lreq)
4471 {
4472 struct ceph_options *opts = osdc->client->options;
4473 struct ceph_osd_request *req;
4474 int ret;
4475
4476 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4477 if (!req)
4478 return -ENOMEM;
4479
4480 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4481 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4482 req->r_flags = CEPH_OSD_FLAG_WRITE;
4483 ktime_get_real_ts(&req->r_mtime);
4484 osd_req_op_watch_init(req, 0, lreq->linger_id,
4485 CEPH_OSD_WATCH_OP_UNWATCH);
4486
4487 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4488 if (ret)
4489 goto out_put_req;
4490
4491 ceph_osdc_start_request(osdc, req, false);
4492 linger_cancel(lreq);
4493 linger_put(lreq);
4494 ret = wait_request_timeout(req, opts->mount_timeout);
4495
4496 out_put_req:
4497 ceph_osdc_put_request(req);
4498 return ret;
4499 }
4500 EXPORT_SYMBOL(ceph_osdc_unwatch);
4501
4502 static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
4503 u64 notify_id, u64 cookie, void *payload,
4504 size_t payload_len)
4505 {
4506 struct ceph_osd_req_op *op;
4507 struct ceph_pagelist *pl;
4508 int ret;
4509
4510 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
4511
4512 pl = kmalloc(sizeof(*pl), GFP_NOIO);
4513 if (!pl)
4514 return -ENOMEM;
4515
4516 ceph_pagelist_init(pl);
4517 ret = ceph_pagelist_encode_64(pl, notify_id);
4518 ret |= ceph_pagelist_encode_64(pl, cookie);
4519 if (payload) {
4520 ret |= ceph_pagelist_encode_32(pl, payload_len);
4521 ret |= ceph_pagelist_append(pl, payload, payload_len);
4522 } else {
4523 ret |= ceph_pagelist_encode_32(pl, 0);
4524 }
4525 if (ret) {
4526 ceph_pagelist_release(pl);
4527 return -ENOMEM;
4528 }
4529
4530 ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
4531 op->indata_len = pl->length;
4532 return 0;
4533 }
4534
4535 int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
4536 struct ceph_object_id *oid,
4537 struct ceph_object_locator *oloc,
4538 u64 notify_id,
4539 u64 cookie,
4540 void *payload,
4541 size_t payload_len)
4542 {
4543 struct ceph_osd_request *req;
4544 int ret;
4545
4546 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4547 if (!req)
4548 return -ENOMEM;
4549
4550 ceph_oid_copy(&req->r_base_oid, oid);
4551 ceph_oloc_copy(&req->r_base_oloc, oloc);
4552 req->r_flags = CEPH_OSD_FLAG_READ;
4553
4554 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4555 if (ret)
4556 goto out_put_req;
4557
4558 ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
4559 payload_len);
4560 if (ret)
4561 goto out_put_req;
4562
4563 ceph_osdc_start_request(osdc, req, false);
4564 ret = ceph_osdc_wait_request(osdc, req);
4565
4566 out_put_req:
4567 ceph_osdc_put_request(req);
4568 return ret;
4569 }
4570 EXPORT_SYMBOL(ceph_osdc_notify_ack);
4571
4572 static int osd_req_op_notify_init(struct ceph_osd_request *req, int which,
4573 u64 cookie, u32 prot_ver, u32 timeout,
4574 void *payload, size_t payload_len)
4575 {
4576 struct ceph_osd_req_op *op;
4577 struct ceph_pagelist *pl;
4578 int ret;
4579
4580 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
4581 op->notify.cookie = cookie;
4582
4583 pl = kmalloc(sizeof(*pl), GFP_NOIO);
4584 if (!pl)
4585 return -ENOMEM;
4586
4587 ceph_pagelist_init(pl);
4588 ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
4589 ret |= ceph_pagelist_encode_32(pl, timeout);
4590 ret |= ceph_pagelist_encode_32(pl, payload_len);
4591 ret |= ceph_pagelist_append(pl, payload, payload_len);
4592 if (ret) {
4593 ceph_pagelist_release(pl);
4594 return -ENOMEM;
4595 }
4596
4597 ceph_osd_data_pagelist_init(&op->notify.request_data, pl);
4598 op->indata_len = pl->length;
4599 return 0;
4600 }
4601
4602 /*
4603 * @timeout: in seconds
4604 *
4605 * @preply_{pages,len} are initialized both on success and error.
4606 * The caller is responsible for:
4607 *
4608 * ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
4609 */
4610 int ceph_osdc_notify(struct ceph_osd_client *osdc,
4611 struct ceph_object_id *oid,
4612 struct ceph_object_locator *oloc,
4613 void *payload,
4614 size_t payload_len,
4615 u32 timeout,
4616 struct page ***preply_pages,
4617 size_t *preply_len)
4618 {
4619 struct ceph_osd_linger_request *lreq;
4620 struct page **pages;
4621 int ret;
4622
4623 WARN_ON(!timeout);
4624 if (preply_pages) {
4625 *preply_pages = NULL;
4626 *preply_len = 0;
4627 }
4628
4629 lreq = linger_alloc(osdc);
4630 if (!lreq)
4631 return -ENOMEM;
4632
4633 lreq->preply_pages = preply_pages;
4634 lreq->preply_len = preply_len;
4635
4636 ceph_oid_copy(&lreq->t.base_oid, oid);
4637 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4638 lreq->t.flags = CEPH_OSD_FLAG_READ;
4639
4640 lreq->reg_req = alloc_linger_request(lreq);
4641 if (!lreq->reg_req) {
4642 ret = -ENOMEM;
4643 goto out_put_lreq;
4644 }
4645
4646 /* for notify_id */
4647 pages = ceph_alloc_page_vector(1, GFP_NOIO);
4648 if (IS_ERR(pages)) {
4649 ret = PTR_ERR(pages);
4650 goto out_put_lreq;
4651 }
4652
4653 down_write(&osdc->lock);
4654 linger_register(lreq); /* before osd_req_op_* */
4655 ret = osd_req_op_notify_init(lreq->reg_req, 0, lreq->linger_id, 1,
4656 timeout, payload, payload_len);
4657 if (ret) {
4658 linger_unregister(lreq);
4659 up_write(&osdc->lock);
4660 ceph_release_page_vector(pages, 1);
4661 goto out_put_lreq;
4662 }
4663 ceph_osd_data_pages_init(osd_req_op_data(lreq->reg_req, 0, notify,
4664 response_data),
4665 pages, PAGE_SIZE, 0, false, true);
4666 linger_submit(lreq);
4667 up_write(&osdc->lock);
4668
4669 ret = linger_reg_commit_wait(lreq);
4670 if (!ret)
4671 ret = linger_notify_finish_wait(lreq);
4672 else
4673 dout("lreq %p failed to initiate notify %d\n", lreq, ret);
4674
4675 linger_cancel(lreq);
4676 out_put_lreq:
4677 linger_put(lreq);
4678 return ret;
4679 }
4680 EXPORT_SYMBOL(ceph_osdc_notify);
4681
4682 /*
4683 * Return the number of milliseconds since the watch was last
4684 * confirmed, or an error. If there is an error, the watch is no
4685 * longer valid, and should be destroyed with ceph_osdc_unwatch().
4686 */
4687 int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
4688 struct ceph_osd_linger_request *lreq)
4689 {
4690 unsigned long stamp, age;
4691 int ret;
4692
4693 down_read(&osdc->lock);
4694 mutex_lock(&lreq->lock);
4695 stamp = lreq->watch_valid_thru;
4696 if (!list_empty(&lreq->pending_lworks)) {
4697 struct linger_work *lwork =
4698 list_first_entry(&lreq->pending_lworks,
4699 struct linger_work,
4700 pending_item);
4701
4702 if (time_before(lwork->queued_stamp, stamp))
4703 stamp = lwork->queued_stamp;
4704 }
4705 age = jiffies - stamp;
4706 dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
4707 lreq, lreq->linger_id, age, lreq->last_error);
4708 /* we are truncating to msecs, so return a safe upper bound */
4709 ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
4710
4711 mutex_unlock(&lreq->lock);
4712 up_read(&osdc->lock);
4713 return ret;
4714 }
4715
4716 static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
4717 {
4718 u8 struct_v;
4719 u32 struct_len;
4720 int ret;
4721
4722 ret = ceph_start_decoding(p, end, 2, "watch_item_t",
4723 &struct_v, &struct_len);
4724 if (ret)
4725 return ret;
4726
4727 ceph_decode_copy(p, &item->name, sizeof(item->name));
4728 item->cookie = ceph_decode_64(p);
4729 *p += 4; /* skip timeout_seconds */
4730 if (struct_v >= 2) {
4731 ceph_decode_copy(p, &item->addr, sizeof(item->addr));
4732 ceph_decode_addr(&item->addr);
4733 }
4734
4735 dout("%s %s%llu cookie %llu addr %s\n", __func__,
4736 ENTITY_NAME(item->name), item->cookie,
4737 ceph_pr_addr(&item->addr.in_addr));
4738 return 0;
4739 }
4740
4741 static int decode_watchers(void **p, void *end,
4742 struct ceph_watch_item **watchers,
4743 u32 *num_watchers)
4744 {
4745 u8 struct_v;
4746 u32 struct_len;
4747 int i;
4748 int ret;
4749
4750 ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
4751 &struct_v, &struct_len);
4752 if (ret)
4753 return ret;
4754
4755 *num_watchers = ceph_decode_32(p);
4756 *watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
4757 if (!*watchers)
4758 return -ENOMEM;
4759
4760 for (i = 0; i < *num_watchers; i++) {
4761 ret = decode_watcher(p, end, *watchers + i);
4762 if (ret) {
4763 kfree(*watchers);
4764 return ret;
4765 }
4766 }
4767
4768 return 0;
4769 }
4770
4771 /*
4772 * On success, the caller is responsible for:
4773 *
4774 * kfree(watchers);
4775 */
4776 int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
4777 struct ceph_object_id *oid,
4778 struct ceph_object_locator *oloc,
4779 struct ceph_watch_item **watchers,
4780 u32 *num_watchers)
4781 {
4782 struct ceph_osd_request *req;
4783 struct page **pages;
4784 int ret;
4785
4786 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4787 if (!req)
4788 return -ENOMEM;
4789
4790 ceph_oid_copy(&req->r_base_oid, oid);
4791 ceph_oloc_copy(&req->r_base_oloc, oloc);
4792 req->r_flags = CEPH_OSD_FLAG_READ;
4793
4794 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4795 if (ret)
4796 goto out_put_req;
4797
4798 pages = ceph_alloc_page_vector(1, GFP_NOIO);
4799 if (IS_ERR(pages)) {
4800 ret = PTR_ERR(pages);
4801 goto out_put_req;
4802 }
4803
4804 osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
4805 ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
4806 response_data),
4807 pages, PAGE_SIZE, 0, false, true);
4808
4809 ceph_osdc_start_request(osdc, req, false);
4810 ret = ceph_osdc_wait_request(osdc, req);
4811 if (ret >= 0) {
4812 void *p = page_address(pages[0]);
4813 void *const end = p + req->r_ops[0].outdata_len;
4814
4815 ret = decode_watchers(&p, end, watchers, num_watchers);
4816 }
4817
4818 out_put_req:
4819 ceph_osdc_put_request(req);
4820 return ret;
4821 }
4822 EXPORT_SYMBOL(ceph_osdc_list_watchers);
4823
4824 /*
4825 * Call all pending notify callbacks - for use after a watch is
4826 * unregistered, to make sure no more callbacks for it will be invoked
4827 */
4828 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
4829 {
4830 dout("%s osdc %p\n", __func__, osdc);
4831 flush_workqueue(osdc->notify_wq);
4832 }
4833 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
4834
4835 void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
4836 {
4837 down_read(&osdc->lock);
4838 maybe_request_map(osdc);
4839 up_read(&osdc->lock);
4840 }
4841 EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
4842
4843 /*
4844 * Execute an OSD class method on an object.
4845 *
4846 * @flags: CEPH_OSD_FLAG_*
4847 * @resp_len: in/out param for reply length
4848 */
4849 int ceph_osdc_call(struct ceph_osd_client *osdc,
4850 struct ceph_object_id *oid,
4851 struct ceph_object_locator *oloc,
4852 const char *class, const char *method,
4853 unsigned int flags,
4854 struct page *req_page, size_t req_len,
4855 struct page *resp_page, size_t *resp_len)
4856 {
4857 struct ceph_osd_request *req;
4858 int ret;
4859
4860 if (req_len > PAGE_SIZE || (resp_page && *resp_len > PAGE_SIZE))
4861 return -E2BIG;
4862
4863 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4864 if (!req)
4865 return -ENOMEM;
4866
4867 ceph_oid_copy(&req->r_base_oid, oid);
4868 ceph_oloc_copy(&req->r_base_oloc, oloc);
4869 req->r_flags = flags;
4870
4871 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4872 if (ret)
4873 goto out_put_req;
4874
4875 osd_req_op_cls_init(req, 0, CEPH_OSD_OP_CALL, class, method);
4876 if (req_page)
4877 osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
4878 0, false, false);
4879 if (resp_page)
4880 osd_req_op_cls_response_data_pages(req, 0, &resp_page,
4881 *resp_len, 0, false, false);
4882
4883 ceph_osdc_start_request(osdc, req, false);
4884 ret = ceph_osdc_wait_request(osdc, req);
4885 if (ret >= 0) {
4886 ret = req->r_ops[0].rval;
4887 if (resp_page)
4888 *resp_len = req->r_ops[0].outdata_len;
4889 }
4890
4891 out_put_req:
4892 ceph_osdc_put_request(req);
4893 return ret;
4894 }
4895 EXPORT_SYMBOL(ceph_osdc_call);
4896
4897 /*
4898 * init, shutdown
4899 */
4900 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
4901 {
4902 int err;
4903
4904 dout("init\n");
4905 osdc->client = client;
4906 init_rwsem(&osdc->lock);
4907 osdc->osds = RB_ROOT;
4908 INIT_LIST_HEAD(&osdc->osd_lru);
4909 spin_lock_init(&osdc->osd_lru_lock);
4910 osd_init(&osdc->homeless_osd);
4911 osdc->homeless_osd.o_osdc = osdc;
4912 osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
4913 osdc->last_linger_id = CEPH_LINGER_ID_START;
4914 osdc->linger_requests = RB_ROOT;
4915 osdc->map_checks = RB_ROOT;
4916 osdc->linger_map_checks = RB_ROOT;
4917 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
4918 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
4919
4920 err = -ENOMEM;
4921 osdc->osdmap = ceph_osdmap_alloc();
4922 if (!osdc->osdmap)
4923 goto out;
4924
4925 osdc->req_mempool = mempool_create_slab_pool(10,
4926 ceph_osd_request_cache);
4927 if (!osdc->req_mempool)
4928 goto out_map;
4929
4930 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
4931 PAGE_SIZE, 10, true, "osd_op");
4932 if (err < 0)
4933 goto out_mempool;
4934 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
4935 PAGE_SIZE, 10, true, "osd_op_reply");
4936 if (err < 0)
4937 goto out_msgpool;
4938
4939 err = -ENOMEM;
4940 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
4941 if (!osdc->notify_wq)
4942 goto out_msgpool_reply;
4943
4944 schedule_delayed_work(&osdc->timeout_work,
4945 osdc->client->options->osd_keepalive_timeout);
4946 schedule_delayed_work(&osdc->osds_timeout_work,
4947 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
4948
4949 return 0;
4950
4951 out_msgpool_reply:
4952 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4953 out_msgpool:
4954 ceph_msgpool_destroy(&osdc->msgpool_op);
4955 out_mempool:
4956 mempool_destroy(osdc->req_mempool);
4957 out_map:
4958 ceph_osdmap_destroy(osdc->osdmap);
4959 out:
4960 return err;
4961 }
4962
4963 void ceph_osdc_stop(struct ceph_osd_client *osdc)
4964 {
4965 flush_workqueue(osdc->notify_wq);
4966 destroy_workqueue(osdc->notify_wq);
4967 cancel_delayed_work_sync(&osdc->timeout_work);
4968 cancel_delayed_work_sync(&osdc->osds_timeout_work);
4969
4970 down_write(&osdc->lock);
4971 while (!RB_EMPTY_ROOT(&osdc->osds)) {
4972 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
4973 struct ceph_osd, o_node);
4974 close_osd(osd);
4975 }
4976 up_write(&osdc->lock);
4977 WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
4978 osd_cleanup(&osdc->homeless_osd);
4979
4980 WARN_ON(!list_empty(&osdc->osd_lru));
4981 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
4982 WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
4983 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
4984 WARN_ON(atomic_read(&osdc->num_requests));
4985 WARN_ON(atomic_read(&osdc->num_homeless));
4986
4987 ceph_osdmap_destroy(osdc->osdmap);
4988 mempool_destroy(osdc->req_mempool);
4989 ceph_msgpool_destroy(&osdc->msgpool_op);
4990 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4991 }
4992
4993 /*
4994 * Read some contiguous pages. If we cross a stripe boundary, shorten
4995 * *plen. Return number of bytes read, or error.
4996 */
4997 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
4998 struct ceph_vino vino, struct ceph_file_layout *layout,
4999 u64 off, u64 *plen,
5000 u32 truncate_seq, u64 truncate_size,
5001 struct page **pages, int num_pages, int page_align)
5002 {
5003 struct ceph_osd_request *req;
5004 int rc = 0;
5005
5006 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
5007 vino.snap, off, *plen);
5008 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
5009 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
5010 NULL, truncate_seq, truncate_size,
5011 false);
5012 if (IS_ERR(req))
5013 return PTR_ERR(req);
5014
5015 /* it may be a short read due to an object boundary */
5016 osd_req_op_extent_osd_data_pages(req, 0,
5017 pages, *plen, page_align, false, false);
5018
5019 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
5020 off, *plen, *plen, page_align);
5021
5022 rc = ceph_osdc_start_request(osdc, req, false);
5023 if (!rc)
5024 rc = ceph_osdc_wait_request(osdc, req);
5025
5026 ceph_osdc_put_request(req);
5027 dout("readpages result %d\n", rc);
5028 return rc;
5029 }
5030 EXPORT_SYMBOL(ceph_osdc_readpages);
5031
5032 /*
5033 * do a synchronous write on N pages
5034 */
5035 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
5036 struct ceph_file_layout *layout,
5037 struct ceph_snap_context *snapc,
5038 u64 off, u64 len,
5039 u32 truncate_seq, u64 truncate_size,
5040 struct timespec *mtime,
5041 struct page **pages, int num_pages)
5042 {
5043 struct ceph_osd_request *req;
5044 int rc = 0;
5045 int page_align = off & ~PAGE_MASK;
5046
5047 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
5048 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
5049 snapc, truncate_seq, truncate_size,
5050 true);
5051 if (IS_ERR(req))
5052 return PTR_ERR(req);
5053
5054 /* it may be a short write due to an object boundary */
5055 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
5056 false, false);
5057 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
5058
5059 req->r_mtime = *mtime;
5060 rc = ceph_osdc_start_request(osdc, req, true);
5061 if (!rc)
5062 rc = ceph_osdc_wait_request(osdc, req);
5063
5064 ceph_osdc_put_request(req);
5065 if (rc == 0)
5066 rc = len;
5067 dout("writepages result %d\n", rc);
5068 return rc;
5069 }
5070 EXPORT_SYMBOL(ceph_osdc_writepages);
5071
5072 int ceph_osdc_setup(void)
5073 {
5074 size_t size = sizeof(struct ceph_osd_request) +
5075 CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
5076
5077 BUG_ON(ceph_osd_request_cache);
5078 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
5079 0, 0, NULL);
5080
5081 return ceph_osd_request_cache ? 0 : -ENOMEM;
5082 }
5083 EXPORT_SYMBOL(ceph_osdc_setup);
5084
5085 void ceph_osdc_cleanup(void)
5086 {
5087 BUG_ON(!ceph_osd_request_cache);
5088 kmem_cache_destroy(ceph_osd_request_cache);
5089 ceph_osd_request_cache = NULL;
5090 }
5091 EXPORT_SYMBOL(ceph_osdc_cleanup);
5092
5093 /*
5094 * handle incoming message
5095 */
5096 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5097 {
5098 struct ceph_osd *osd = con->private;
5099 struct ceph_osd_client *osdc = osd->o_osdc;
5100 int type = le16_to_cpu(msg->hdr.type);
5101
5102 switch (type) {
5103 case CEPH_MSG_OSD_MAP:
5104 ceph_osdc_handle_map(osdc, msg);
5105 break;
5106 case CEPH_MSG_OSD_OPREPLY:
5107 handle_reply(osd, msg);
5108 break;
5109 case CEPH_MSG_OSD_BACKOFF:
5110 handle_backoff(osd, msg);
5111 break;
5112 case CEPH_MSG_WATCH_NOTIFY:
5113 handle_watch_notify(osdc, msg);
5114 break;
5115
5116 default:
5117 pr_err("received unknown message type %d %s\n", type,
5118 ceph_msg_type_name(type));
5119 }
5120
5121 ceph_msg_put(msg);
5122 }
5123
5124 /*
5125 * Lookup and return message for incoming reply. Don't try to do
5126 * anything about a larger than preallocated data portion of the
5127 * message at the moment - for now, just skip the message.
5128 */
5129 static struct ceph_msg *get_reply(struct ceph_connection *con,
5130 struct ceph_msg_header *hdr,
5131 int *skip)
5132 {
5133 struct ceph_osd *osd = con->private;
5134 struct ceph_osd_client *osdc = osd->o_osdc;
5135 struct ceph_msg *m = NULL;
5136 struct ceph_osd_request *req;
5137 int front_len = le32_to_cpu(hdr->front_len);
5138 int data_len = le32_to_cpu(hdr->data_len);
5139 u64 tid = le64_to_cpu(hdr->tid);
5140
5141 down_read(&osdc->lock);
5142 if (!osd_registered(osd)) {
5143 dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
5144 *skip = 1;
5145 goto out_unlock_osdc;
5146 }
5147 WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));
5148
5149 mutex_lock(&osd->lock);
5150 req = lookup_request(&osd->o_requests, tid);
5151 if (!req) {
5152 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
5153 osd->o_osd, tid);
5154 *skip = 1;
5155 goto out_unlock_session;
5156 }
5157
5158 ceph_msg_revoke_incoming(req->r_reply);
5159
5160 if (front_len > req->r_reply->front_alloc_len) {
5161 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
5162 __func__, osd->o_osd, req->r_tid, front_len,
5163 req->r_reply->front_alloc_len);
5164 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
5165 false);
5166 if (!m)
5167 goto out_unlock_session;
5168 ceph_msg_put(req->r_reply);
5169 req->r_reply = m;
5170 }
5171
5172 if (data_len > req->r_reply->data_length) {
5173 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
5174 __func__, osd->o_osd, req->r_tid, data_len,
5175 req->r_reply->data_length);
5176 m = NULL;
5177 *skip = 1;
5178 goto out_unlock_session;
5179 }
5180
5181 m = ceph_msg_get(req->r_reply);
5182 dout("get_reply tid %lld %p\n", tid, m);
5183
5184 out_unlock_session:
5185 mutex_unlock(&osd->lock);
5186 out_unlock_osdc:
5187 up_read(&osdc->lock);
5188 return m;
5189 }
5190
5191 /*
5192 * TODO: switch to a msg-owned pagelist
5193 */
5194 static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
5195 {
5196 struct ceph_msg *m;
5197 int type = le16_to_cpu(hdr->type);
5198 u32 front_len = le32_to_cpu(hdr->front_len);
5199 u32 data_len = le32_to_cpu(hdr->data_len);
5200
5201 m = ceph_msg_new(type, front_len, GFP_NOIO, false);
5202 if (!m)
5203 return NULL;
5204
5205 if (data_len) {
5206 struct page **pages;
5207 struct ceph_osd_data osd_data;
5208
5209 pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
5210 GFP_NOIO);
5211 if (IS_ERR(pages)) {
5212 ceph_msg_put(m);
5213 return NULL;
5214 }
5215
5216 ceph_osd_data_pages_init(&osd_data, pages, data_len, 0, false,
5217 false);
5218 ceph_osdc_msg_data_add(m, &osd_data);
5219 }
5220
5221 return m;
5222 }
5223
5224 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
5225 struct ceph_msg_header *hdr,
5226 int *skip)
5227 {
5228 struct ceph_osd *osd = con->private;
5229 int type = le16_to_cpu(hdr->type);
5230
5231 *skip = 0;
5232 switch (type) {
5233 case CEPH_MSG_OSD_MAP:
5234 case CEPH_MSG_OSD_BACKOFF:
5235 case CEPH_MSG_WATCH_NOTIFY:
5236 return alloc_msg_with_page_vector(hdr);
5237 case CEPH_MSG_OSD_OPREPLY:
5238 return get_reply(con, hdr, skip);
5239 default:
5240 pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
5241 osd->o_osd, type);
5242 *skip = 1;
5243 return NULL;
5244 }
5245 }
5246
5247 /*
5248 * Wrappers to refcount containing ceph_osd struct
5249 */
5250 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
5251 {
5252 struct ceph_osd *osd = con->private;
5253 if (get_osd(osd))
5254 return con;
5255 return NULL;
5256 }
5257
5258 static void put_osd_con(struct ceph_connection *con)
5259 {
5260 struct ceph_osd *osd = con->private;
5261 put_osd(osd);
5262 }
5263
5264 /*
5265 * authentication
5266 */
5267 /*
5268 * Note: returned pointer is the address of a structure that's
5269 * managed separately. Caller must *not* attempt to free it.
5270 */
5271 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
5272 int *proto, int force_new)
5273 {
5274 struct ceph_osd *o = con->private;
5275 struct ceph_osd_client *osdc = o->o_osdc;
5276 struct ceph_auth_client *ac = osdc->client->monc.auth;
5277 struct ceph_auth_handshake *auth = &o->o_auth;
5278
5279 if (force_new && auth->authorizer) {
5280 ceph_auth_destroy_authorizer(auth->authorizer);
5281 auth->authorizer = NULL;
5282 }
5283 if (!auth->authorizer) {
5284 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5285 auth);
5286 if (ret)
5287 return ERR_PTR(ret);
5288 } else {
5289 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5290 auth);
5291 if (ret)
5292 return ERR_PTR(ret);
5293 }
5294 *proto = ac->protocol;
5295
5296 return auth;
5297 }
5298
5299
5300 static int verify_authorizer_reply(struct ceph_connection *con)
5301 {
5302 struct ceph_osd *o = con->private;
5303 struct ceph_osd_client *osdc = o->o_osdc;
5304 struct ceph_auth_client *ac = osdc->client->monc.auth;
5305
5306 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer);
5307 }
5308
5309 static int invalidate_authorizer(struct ceph_connection *con)
5310 {
5311 struct ceph_osd *o = con->private;
5312 struct ceph_osd_client *osdc = o->o_osdc;
5313 struct ceph_auth_client *ac = osdc->client->monc.auth;
5314
5315 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
5316 return ceph_monc_validate_auth(&osdc->client->monc);
5317 }
5318
5319 static void osd_reencode_message(struct ceph_msg *msg)
5320 {
5321 int type = le16_to_cpu(msg->hdr.type);
5322
5323 if (type == CEPH_MSG_OSD_OP)
5324 encode_request_finish(msg);
5325 }
5326
5327 static int osd_sign_message(struct ceph_msg *msg)
5328 {
5329 struct ceph_osd *o = msg->con->private;
5330 struct ceph_auth_handshake *auth = &o->o_auth;
5331
5332 return ceph_auth_sign_message(auth, msg);
5333 }
5334
5335 static int osd_check_message_signature(struct ceph_msg *msg)
5336 {
5337 struct ceph_osd *o = msg->con->private;
5338 struct ceph_auth_handshake *auth = &o->o_auth;
5339
5340 return ceph_auth_check_message_signature(auth, msg);
5341 }
5342
5343 static const struct ceph_connection_operations osd_con_ops = {
5344 .get = get_osd_con,
5345 .put = put_osd_con,
5346 .dispatch = dispatch,
5347 .get_authorizer = get_authorizer,
5348 .verify_authorizer_reply = verify_authorizer_reply,
5349 .invalidate_authorizer = invalidate_authorizer,
5350 .alloc_msg = alloc_msg,
5351 .reencode_message = osd_reencode_message,
5352 .sign_message = osd_sign_message,
5353 .check_message_signature = osd_check_message_signature,
5354 .fault = osd_fault,
5355 };
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