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btrfs: move volume_mutex into the btrfs_rm_device()
[linux/fpc-iii.git] / net / ceph / osd_client.c
blob2814dba5902d7a862a0ffb42b488af473a43fb59
1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/ceph/ceph_debug.h>
4
5 #include <linux/module.h>
6 #include <linux/err.h>
7 #include <linux/highmem.h>
8 #include <linux/mm.h>
9 #include <linux/pagemap.h>
10 #include <linux/slab.h>
11 #include <linux/uaccess.h>
12 #ifdef CONFIG_BLOCK
13 #include <linux/bio.h>
14 #endif
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/osd_client.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/auth.h>
22 #include <linux/ceph/pagelist.h>
23
24 #define OSD_OPREPLY_FRONT_LEN 512
25
26 static struct kmem_cache *ceph_osd_request_cache;
27
28 static const struct ceph_connection_operations osd_con_ops;
29
30 /*
31 * Implement client access to distributed object storage cluster.
32 *
33 * All data objects are stored within a cluster/cloud of OSDs, or
34 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
35 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
36 * remote daemons serving up and coordinating consistent and safe
37 * access to storage.
38 *
39 * Cluster membership and the mapping of data objects onto storage devices
40 * are described by the osd map.
41 *
42 * We keep track of pending OSD requests (read, write), resubmit
43 * requests to different OSDs when the cluster topology/data layout
44 * change, or retry the affected requests when the communications
45 * channel with an OSD is reset.
46 */
47
48 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
49 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
50 static void link_linger(struct ceph_osd *osd,
51 struct ceph_osd_linger_request *lreq);
52 static void unlink_linger(struct ceph_osd *osd,
53 struct ceph_osd_linger_request *lreq);
54 static void clear_backoffs(struct ceph_osd *osd);
55
56 #if 1
57 static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
58 {
59 bool wrlocked = true;
60
61 if (unlikely(down_read_trylock(sem))) {
62 wrlocked = false;
63 up_read(sem);
64 }
65
66 return wrlocked;
67 }
68 static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
69 {
70 WARN_ON(!rwsem_is_locked(&osdc->lock));
71 }
72 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
73 {
74 WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
75 }
76 static inline void verify_osd_locked(struct ceph_osd *osd)
77 {
78 struct ceph_osd_client *osdc = osd->o_osdc;
79
80 WARN_ON(!(mutex_is_locked(&osd->lock) &&
81 rwsem_is_locked(&osdc->lock)) &&
82 !rwsem_is_wrlocked(&osdc->lock));
83 }
84 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
85 {
86 WARN_ON(!mutex_is_locked(&lreq->lock));
87 }
88 #else
89 static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
90 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
91 static inline void verify_osd_locked(struct ceph_osd *osd) { }
92 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
93 #endif
94
95 /*
96 * calculate the mapping of a file extent onto an object, and fill out the
97 * request accordingly. shorten extent as necessary if it crosses an
98 * object boundary.
99 *
100 * fill osd op in request message.
101 */
102 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
103 u64 *objnum, u64 *objoff, u64 *objlen)
104 {
105 u64 orig_len = *plen;
106 int r;
107
108 /* object extent? */
109 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
110 objoff, objlen);
111 if (r < 0)
112 return r;
113 if (*objlen < orig_len) {
114 *plen = *objlen;
115 dout(" skipping last %llu, final file extent %llu~%llu\n",
116 orig_len - *plen, off, *plen);
117 }
118
119 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
120
121 return 0;
122 }
123
124 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
125 {
126 memset(osd_data, 0, sizeof (*osd_data));
127 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
128 }
129
130 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
131 struct page **pages, u64 length, u32 alignment,
132 bool pages_from_pool, bool own_pages)
133 {
134 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
135 osd_data->pages = pages;
136 osd_data->length = length;
137 osd_data->alignment = alignment;
138 osd_data->pages_from_pool = pages_from_pool;
139 osd_data->own_pages = own_pages;
140 }
141
142 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
143 struct ceph_pagelist *pagelist)
144 {
145 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
146 osd_data->pagelist = pagelist;
147 }
148
149 #ifdef CONFIG_BLOCK
150 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
151 struct bio *bio, size_t bio_length)
152 {
153 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
154 osd_data->bio = bio;
155 osd_data->bio_length = bio_length;
156 }
157 #endif /* CONFIG_BLOCK */
158
159 #define osd_req_op_data(oreq, whch, typ, fld) \
160 ({ \
161 struct ceph_osd_request *__oreq = (oreq); \
162 unsigned int __whch = (whch); \
163 BUG_ON(__whch >= __oreq->r_num_ops); \
164 &__oreq->r_ops[__whch].typ.fld; \
165 })
166
167 static struct ceph_osd_data *
168 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
169 {
170 BUG_ON(which >= osd_req->r_num_ops);
171
172 return &osd_req->r_ops[which].raw_data_in;
173 }
174
175 struct ceph_osd_data *
176 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
177 unsigned int which)
178 {
179 return osd_req_op_data(osd_req, which, extent, osd_data);
180 }
181 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
182
183 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
184 unsigned int which, struct page **pages,
185 u64 length, u32 alignment,
186 bool pages_from_pool, bool own_pages)
187 {
188 struct ceph_osd_data *osd_data;
189
190 osd_data = osd_req_op_raw_data_in(osd_req, which);
191 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
192 pages_from_pool, own_pages);
193 }
194 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
195
196 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
197 unsigned int which, struct page **pages,
198 u64 length, u32 alignment,
199 bool pages_from_pool, bool own_pages)
200 {
201 struct ceph_osd_data *osd_data;
202
203 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
204 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
205 pages_from_pool, own_pages);
206 }
207 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
208
209 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
210 unsigned int which, struct ceph_pagelist *pagelist)
211 {
212 struct ceph_osd_data *osd_data;
213
214 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
215 ceph_osd_data_pagelist_init(osd_data, pagelist);
216 }
217 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
218
219 #ifdef CONFIG_BLOCK
220 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
221 unsigned int which, struct bio *bio, size_t bio_length)
222 {
223 struct ceph_osd_data *osd_data;
224
225 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
226 ceph_osd_data_bio_init(osd_data, bio, bio_length);
227 }
228 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
229 #endif /* CONFIG_BLOCK */
230
231 static void osd_req_op_cls_request_info_pagelist(
232 struct ceph_osd_request *osd_req,
233 unsigned int which, struct ceph_pagelist *pagelist)
234 {
235 struct ceph_osd_data *osd_data;
236
237 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
238 ceph_osd_data_pagelist_init(osd_data, pagelist);
239 }
240
241 void osd_req_op_cls_request_data_pagelist(
242 struct ceph_osd_request *osd_req,
243 unsigned int which, struct ceph_pagelist *pagelist)
244 {
245 struct ceph_osd_data *osd_data;
246
247 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
248 ceph_osd_data_pagelist_init(osd_data, pagelist);
249 osd_req->r_ops[which].cls.indata_len += pagelist->length;
250 osd_req->r_ops[which].indata_len += pagelist->length;
251 }
252 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
253
254 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
255 unsigned int which, struct page **pages, u64 length,
256 u32 alignment, bool pages_from_pool, bool own_pages)
257 {
258 struct ceph_osd_data *osd_data;
259
260 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
261 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
262 pages_from_pool, own_pages);
263 osd_req->r_ops[which].cls.indata_len += length;
264 osd_req->r_ops[which].indata_len += length;
265 }
266 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
267
268 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
269 unsigned int which, struct page **pages, u64 length,
270 u32 alignment, bool pages_from_pool, bool own_pages)
271 {
272 struct ceph_osd_data *osd_data;
273
274 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
275 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
276 pages_from_pool, own_pages);
277 }
278 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
279
280 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
281 {
282 switch (osd_data->type) {
283 case CEPH_OSD_DATA_TYPE_NONE:
284 return 0;
285 case CEPH_OSD_DATA_TYPE_PAGES:
286 return osd_data->length;
287 case CEPH_OSD_DATA_TYPE_PAGELIST:
288 return (u64)osd_data->pagelist->length;
289 #ifdef CONFIG_BLOCK
290 case CEPH_OSD_DATA_TYPE_BIO:
291 return (u64)osd_data->bio_length;
292 #endif /* CONFIG_BLOCK */
293 default:
294 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
295 return 0;
296 }
297 }
298
299 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
300 {
301 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
302 int num_pages;
303
304 num_pages = calc_pages_for((u64)osd_data->alignment,
305 (u64)osd_data->length);
306 ceph_release_page_vector(osd_data->pages, num_pages);
307 }
308 ceph_osd_data_init(osd_data);
309 }
310
311 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
312 unsigned int which)
313 {
314 struct ceph_osd_req_op *op;
315
316 BUG_ON(which >= osd_req->r_num_ops);
317 op = &osd_req->r_ops[which];
318
319 switch (op->op) {
320 case CEPH_OSD_OP_READ:
321 case CEPH_OSD_OP_WRITE:
322 case CEPH_OSD_OP_WRITEFULL:
323 ceph_osd_data_release(&op->extent.osd_data);
324 break;
325 case CEPH_OSD_OP_CALL:
326 ceph_osd_data_release(&op->cls.request_info);
327 ceph_osd_data_release(&op->cls.request_data);
328 ceph_osd_data_release(&op->cls.response_data);
329 break;
330 case CEPH_OSD_OP_SETXATTR:
331 case CEPH_OSD_OP_CMPXATTR:
332 ceph_osd_data_release(&op->xattr.osd_data);
333 break;
334 case CEPH_OSD_OP_STAT:
335 ceph_osd_data_release(&op->raw_data_in);
336 break;
337 case CEPH_OSD_OP_NOTIFY_ACK:
338 ceph_osd_data_release(&op->notify_ack.request_data);
339 break;
340 case CEPH_OSD_OP_NOTIFY:
341 ceph_osd_data_release(&op->notify.request_data);
342 ceph_osd_data_release(&op->notify.response_data);
343 break;
344 case CEPH_OSD_OP_LIST_WATCHERS:
345 ceph_osd_data_release(&op->list_watchers.response_data);
346 break;
347 default:
348 break;
349 }
350 }
351
352 /*
353 * Assumes @t is zero-initialized.
354 */
355 static void target_init(struct ceph_osd_request_target *t)
356 {
357 ceph_oid_init(&t->base_oid);
358 ceph_oloc_init(&t->base_oloc);
359 ceph_oid_init(&t->target_oid);
360 ceph_oloc_init(&t->target_oloc);
361
362 ceph_osds_init(&t->acting);
363 ceph_osds_init(&t->up);
364 t->size = -1;
365 t->min_size = -1;
366
367 t->osd = CEPH_HOMELESS_OSD;
368 }
369
370 static void target_copy(struct ceph_osd_request_target *dest,
371 const struct ceph_osd_request_target *src)
372 {
373 ceph_oid_copy(&dest->base_oid, &src->base_oid);
374 ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
375 ceph_oid_copy(&dest->target_oid, &src->target_oid);
376 ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);
377
378 dest->pgid = src->pgid; /* struct */
379 dest->spgid = src->spgid; /* struct */
380 dest->pg_num = src->pg_num;
381 dest->pg_num_mask = src->pg_num_mask;
382 ceph_osds_copy(&dest->acting, &src->acting);
383 ceph_osds_copy(&dest->up, &src->up);
384 dest->size = src->size;
385 dest->min_size = src->min_size;
386 dest->sort_bitwise = src->sort_bitwise;
387
388 dest->flags = src->flags;
389 dest->paused = src->paused;
390
391 dest->epoch = src->epoch;
392 dest->last_force_resend = src->last_force_resend;
393
394 dest->osd = src->osd;
395 }
396
397 static void target_destroy(struct ceph_osd_request_target *t)
398 {
399 ceph_oid_destroy(&t->base_oid);
400 ceph_oloc_destroy(&t->base_oloc);
401 ceph_oid_destroy(&t->target_oid);
402 ceph_oloc_destroy(&t->target_oloc);
403 }
404
405 /*
406 * requests
407 */
408 static void request_release_checks(struct ceph_osd_request *req)
409 {
410 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
411 WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
412 WARN_ON(!list_empty(&req->r_unsafe_item));
413 WARN_ON(req->r_osd);
414 }
415
416 static void ceph_osdc_release_request(struct kref *kref)
417 {
418 struct ceph_osd_request *req = container_of(kref,
419 struct ceph_osd_request, r_kref);
420 unsigned int which;
421
422 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
423 req->r_request, req->r_reply);
424 request_release_checks(req);
425
426 if (req->r_request)
427 ceph_msg_put(req->r_request);
428 if (req->r_reply)
429 ceph_msg_put(req->r_reply);
430
431 for (which = 0; which < req->r_num_ops; which++)
432 osd_req_op_data_release(req, which);
433
434 target_destroy(&req->r_t);
435 ceph_put_snap_context(req->r_snapc);
436
437 if (req->r_mempool)
438 mempool_free(req, req->r_osdc->req_mempool);
439 else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
440 kmem_cache_free(ceph_osd_request_cache, req);
441 else
442 kfree(req);
443 }
444
445 void ceph_osdc_get_request(struct ceph_osd_request *req)
446 {
447 dout("%s %p (was %d)\n", __func__, req,
448 kref_read(&req->r_kref));
449 kref_get(&req->r_kref);
450 }
451 EXPORT_SYMBOL(ceph_osdc_get_request);
452
453 void ceph_osdc_put_request(struct ceph_osd_request *req)
454 {
455 if (req) {
456 dout("%s %p (was %d)\n", __func__, req,
457 kref_read(&req->r_kref));
458 kref_put(&req->r_kref, ceph_osdc_release_request);
459 }
460 }
461 EXPORT_SYMBOL(ceph_osdc_put_request);
462
463 static void request_init(struct ceph_osd_request *req)
464 {
465 /* req only, each op is zeroed in _osd_req_op_init() */
466 memset(req, 0, sizeof(*req));
467
468 kref_init(&req->r_kref);
469 init_completion(&req->r_completion);
470 RB_CLEAR_NODE(&req->r_node);
471 RB_CLEAR_NODE(&req->r_mc_node);
472 INIT_LIST_HEAD(&req->r_unsafe_item);
473
474 target_init(&req->r_t);
475 }
476
477 /*
478 * This is ugly, but it allows us to reuse linger registration and ping
479 * requests, keeping the structure of the code around send_linger{_ping}()
480 * reasonable. Setting up a min_nr=2 mempool for each linger request
481 * and dealing with copying ops (this blasts req only, watch op remains
482 * intact) isn't any better.
483 */
484 static void request_reinit(struct ceph_osd_request *req)
485 {
486 struct ceph_osd_client *osdc = req->r_osdc;
487 bool mempool = req->r_mempool;
488 unsigned int num_ops = req->r_num_ops;
489 u64 snapid = req->r_snapid;
490 struct ceph_snap_context *snapc = req->r_snapc;
491 bool linger = req->r_linger;
492 struct ceph_msg *request_msg = req->r_request;
493 struct ceph_msg *reply_msg = req->r_reply;
494
495 dout("%s req %p\n", __func__, req);
496 WARN_ON(kref_read(&req->r_kref) != 1);
497 request_release_checks(req);
498
499 WARN_ON(kref_read(&request_msg->kref) != 1);
500 WARN_ON(kref_read(&reply_msg->kref) != 1);
501 target_destroy(&req->r_t);
502
503 request_init(req);
504 req->r_osdc = osdc;
505 req->r_mempool = mempool;
506 req->r_num_ops = num_ops;
507 req->r_snapid = snapid;
508 req->r_snapc = snapc;
509 req->r_linger = linger;
510 req->r_request = request_msg;
511 req->r_reply = reply_msg;
512 }
513
514 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
515 struct ceph_snap_context *snapc,
516 unsigned int num_ops,
517 bool use_mempool,
518 gfp_t gfp_flags)
519 {
520 struct ceph_osd_request *req;
521
522 if (use_mempool) {
523 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
524 req = mempool_alloc(osdc->req_mempool, gfp_flags);
525 } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
526 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
527 } else {
528 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
529 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
530 gfp_flags);
531 }
532 if (unlikely(!req))
533 return NULL;
534
535 request_init(req);
536 req->r_osdc = osdc;
537 req->r_mempool = use_mempool;
538 req->r_num_ops = num_ops;
539 req->r_snapid = CEPH_NOSNAP;
540 req->r_snapc = ceph_get_snap_context(snapc);
541
542 dout("%s req %p\n", __func__, req);
543 return req;
544 }
545 EXPORT_SYMBOL(ceph_osdc_alloc_request);
546
547 static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
548 {
549 return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
550 }
551
552 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
553 {
554 struct ceph_osd_client *osdc = req->r_osdc;
555 struct ceph_msg *msg;
556 int msg_size;
557
558 WARN_ON(ceph_oid_empty(&req->r_base_oid));
559 WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
560
561 /* create request message */
562 msg_size = CEPH_ENCODING_START_BLK_LEN +
563 CEPH_PGID_ENCODING_LEN + 1; /* spgid */
564 msg_size += 4 + 4 + 4; /* hash, osdmap_epoch, flags */
565 msg_size += CEPH_ENCODING_START_BLK_LEN +
566 sizeof(struct ceph_osd_reqid); /* reqid */
567 msg_size += sizeof(struct ceph_blkin_trace_info); /* trace */
568 msg_size += 4 + sizeof(struct ceph_timespec); /* client_inc, mtime */
569 msg_size += CEPH_ENCODING_START_BLK_LEN +
570 ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
571 msg_size += 4 + req->r_base_oid.name_len; /* oid */
572 msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
573 msg_size += 8; /* snapid */
574 msg_size += 8; /* snap_seq */
575 msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
576 msg_size += 4 + 8; /* retry_attempt, features */
577
578 if (req->r_mempool)
579 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
580 else
581 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
582 if (!msg)
583 return -ENOMEM;
584
585 memset(msg->front.iov_base, 0, msg->front.iov_len);
586 req->r_request = msg;
587
588 /* create reply message */
589 msg_size = OSD_OPREPLY_FRONT_LEN;
590 msg_size += req->r_base_oid.name_len;
591 msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
592
593 if (req->r_mempool)
594 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
595 else
596 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
597 if (!msg)
598 return -ENOMEM;
599
600 req->r_reply = msg;
601
602 return 0;
603 }
604 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
605
606 static bool osd_req_opcode_valid(u16 opcode)
607 {
608 switch (opcode) {
609 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
610 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
611 #undef GENERATE_CASE
612 default:
613 return false;
614 }
615 }
616
617 /*
618 * This is an osd op init function for opcodes that have no data or
619 * other information associated with them. It also serves as a
620 * common init routine for all the other init functions, below.
621 */
622 static struct ceph_osd_req_op *
623 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
624 u16 opcode, u32 flags)
625 {
626 struct ceph_osd_req_op *op;
627
628 BUG_ON(which >= osd_req->r_num_ops);
629 BUG_ON(!osd_req_opcode_valid(opcode));
630
631 op = &osd_req->r_ops[which];
632 memset(op, 0, sizeof (*op));
633 op->op = opcode;
634 op->flags = flags;
635
636 return op;
637 }
638
639 void osd_req_op_init(struct ceph_osd_request *osd_req,
640 unsigned int which, u16 opcode, u32 flags)
641 {
642 (void)_osd_req_op_init(osd_req, which, opcode, flags);
643 }
644 EXPORT_SYMBOL(osd_req_op_init);
645
646 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
647 unsigned int which, u16 opcode,
648 u64 offset, u64 length,
649 u64 truncate_size, u32 truncate_seq)
650 {
651 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
652 opcode, 0);
653 size_t payload_len = 0;
654
655 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
656 opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
657 opcode != CEPH_OSD_OP_TRUNCATE);
658
659 op->extent.offset = offset;
660 op->extent.length = length;
661 op->extent.truncate_size = truncate_size;
662 op->extent.truncate_seq = truncate_seq;
663 if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
664 payload_len += length;
665
666 op->indata_len = payload_len;
667 }
668 EXPORT_SYMBOL(osd_req_op_extent_init);
669
670 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
671 unsigned int which, u64 length)
672 {
673 struct ceph_osd_req_op *op;
674 u64 previous;
675
676 BUG_ON(which >= osd_req->r_num_ops);
677 op = &osd_req->r_ops[which];
678 previous = op->extent.length;
679
680 if (length == previous)
681 return; /* Nothing to do */
682 BUG_ON(length > previous);
683
684 op->extent.length = length;
685 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
686 op->indata_len -= previous - length;
687 }
688 EXPORT_SYMBOL(osd_req_op_extent_update);
689
690 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
691 unsigned int which, u64 offset_inc)
692 {
693 struct ceph_osd_req_op *op, *prev_op;
694
695 BUG_ON(which + 1 >= osd_req->r_num_ops);
696
697 prev_op = &osd_req->r_ops[which];
698 op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
699 /* dup previous one */
700 op->indata_len = prev_op->indata_len;
701 op->outdata_len = prev_op->outdata_len;
702 op->extent = prev_op->extent;
703 /* adjust offset */
704 op->extent.offset += offset_inc;
705 op->extent.length -= offset_inc;
706
707 if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
708 op->indata_len -= offset_inc;
709 }
710 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
711
712 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
713 u16 opcode, const char *class, const char *method)
714 {
715 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
716 opcode, 0);
717 struct ceph_pagelist *pagelist;
718 size_t payload_len = 0;
719 size_t size;
720
721 BUG_ON(opcode != CEPH_OSD_OP_CALL);
722
723 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
724 BUG_ON(!pagelist);
725 ceph_pagelist_init(pagelist);
726
727 op->cls.class_name = class;
728 size = strlen(class);
729 BUG_ON(size > (size_t) U8_MAX);
730 op->cls.class_len = size;
731 ceph_pagelist_append(pagelist, class, size);
732 payload_len += size;
733
734 op->cls.method_name = method;
735 size = strlen(method);
736 BUG_ON(size > (size_t) U8_MAX);
737 op->cls.method_len = size;
738 ceph_pagelist_append(pagelist, method, size);
739 payload_len += size;
740
741 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
742
743 op->indata_len = payload_len;
744 }
745 EXPORT_SYMBOL(osd_req_op_cls_init);
746
747 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
748 u16 opcode, const char *name, const void *value,
749 size_t size, u8 cmp_op, u8 cmp_mode)
750 {
751 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
752 opcode, 0);
753 struct ceph_pagelist *pagelist;
754 size_t payload_len;
755
756 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
757
758 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
759 if (!pagelist)
760 return -ENOMEM;
761
762 ceph_pagelist_init(pagelist);
763
764 payload_len = strlen(name);
765 op->xattr.name_len = payload_len;
766 ceph_pagelist_append(pagelist, name, payload_len);
767
768 op->xattr.value_len = size;
769 ceph_pagelist_append(pagelist, value, size);
770 payload_len += size;
771
772 op->xattr.cmp_op = cmp_op;
773 op->xattr.cmp_mode = cmp_mode;
774
775 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
776 op->indata_len = payload_len;
777 return 0;
778 }
779 EXPORT_SYMBOL(osd_req_op_xattr_init);
780
781 /*
782 * @watch_opcode: CEPH_OSD_WATCH_OP_*
783 */
784 static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
785 u64 cookie, u8 watch_opcode)
786 {
787 struct ceph_osd_req_op *op;
788
789 op = _osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
790 op->watch.cookie = cookie;
791 op->watch.op = watch_opcode;
792 op->watch.gen = 0;
793 }
794
795 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
796 unsigned int which,
797 u64 expected_object_size,
798 u64 expected_write_size)
799 {
800 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
801 CEPH_OSD_OP_SETALLOCHINT,
802 0);
803
804 op->alloc_hint.expected_object_size = expected_object_size;
805 op->alloc_hint.expected_write_size = expected_write_size;
806
807 /*
808 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
809 * not worth a feature bit. Set FAILOK per-op flag to make
810 * sure older osds don't trip over an unsupported opcode.
811 */
812 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
813 }
814 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
815
816 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
817 struct ceph_osd_data *osd_data)
818 {
819 u64 length = ceph_osd_data_length(osd_data);
820
821 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
822 BUG_ON(length > (u64) SIZE_MAX);
823 if (length)
824 ceph_msg_data_add_pages(msg, osd_data->pages,
825 length, osd_data->alignment);
826 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
827 BUG_ON(!length);
828 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
829 #ifdef CONFIG_BLOCK
830 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
831 ceph_msg_data_add_bio(msg, osd_data->bio, length);
832 #endif
833 } else {
834 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
835 }
836 }
837
838 static u32 osd_req_encode_op(struct ceph_osd_op *dst,
839 const struct ceph_osd_req_op *src)
840 {
841 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
842 pr_err("unrecognized osd opcode %d\n", src->op);
843
844 return 0;
845 }
846
847 switch (src->op) {
848 case CEPH_OSD_OP_STAT:
849 break;
850 case CEPH_OSD_OP_READ:
851 case CEPH_OSD_OP_WRITE:
852 case CEPH_OSD_OP_WRITEFULL:
853 case CEPH_OSD_OP_ZERO:
854 case CEPH_OSD_OP_TRUNCATE:
855 dst->extent.offset = cpu_to_le64(src->extent.offset);
856 dst->extent.length = cpu_to_le64(src->extent.length);
857 dst->extent.truncate_size =
858 cpu_to_le64(src->extent.truncate_size);
859 dst->extent.truncate_seq =
860 cpu_to_le32(src->extent.truncate_seq);
861 break;
862 case CEPH_OSD_OP_CALL:
863 dst->cls.class_len = src->cls.class_len;
864 dst->cls.method_len = src->cls.method_len;
865 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
866 break;
867 case CEPH_OSD_OP_WATCH:
868 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
869 dst->watch.ver = cpu_to_le64(0);
870 dst->watch.op = src->watch.op;
871 dst->watch.gen = cpu_to_le32(src->watch.gen);
872 break;
873 case CEPH_OSD_OP_NOTIFY_ACK:
874 break;
875 case CEPH_OSD_OP_NOTIFY:
876 dst->notify.cookie = cpu_to_le64(src->notify.cookie);
877 break;
878 case CEPH_OSD_OP_LIST_WATCHERS:
879 break;
880 case CEPH_OSD_OP_SETALLOCHINT:
881 dst->alloc_hint.expected_object_size =
882 cpu_to_le64(src->alloc_hint.expected_object_size);
883 dst->alloc_hint.expected_write_size =
884 cpu_to_le64(src->alloc_hint.expected_write_size);
885 break;
886 case CEPH_OSD_OP_SETXATTR:
887 case CEPH_OSD_OP_CMPXATTR:
888 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
889 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
890 dst->xattr.cmp_op = src->xattr.cmp_op;
891 dst->xattr.cmp_mode = src->xattr.cmp_mode;
892 break;
893 case CEPH_OSD_OP_CREATE:
894 case CEPH_OSD_OP_DELETE:
895 break;
896 default:
897 pr_err("unsupported osd opcode %s\n",
898 ceph_osd_op_name(src->op));
899 WARN_ON(1);
900
901 return 0;
902 }
903
904 dst->op = cpu_to_le16(src->op);
905 dst->flags = cpu_to_le32(src->flags);
906 dst->payload_len = cpu_to_le32(src->indata_len);
907
908 return src->indata_len;
909 }
910
911 /*
912 * build new request AND message, calculate layout, and adjust file
913 * extent as needed.
914 *
915 * if the file was recently truncated, we include information about its
916 * old and new size so that the object can be updated appropriately. (we
917 * avoid synchronously deleting truncated objects because it's slow.)
918 */
919 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
920 struct ceph_file_layout *layout,
921 struct ceph_vino vino,
922 u64 off, u64 *plen,
923 unsigned int which, int num_ops,
924 int opcode, int flags,
925 struct ceph_snap_context *snapc,
926 u32 truncate_seq,
927 u64 truncate_size,
928 bool use_mempool)
929 {
930 struct ceph_osd_request *req;
931 u64 objnum = 0;
932 u64 objoff = 0;
933 u64 objlen = 0;
934 int r;
935
936 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
937 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
938 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
939
940 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
941 GFP_NOFS);
942 if (!req) {
943 r = -ENOMEM;
944 goto fail;
945 }
946
947 /* calculate max write size */
948 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
949 if (r)
950 goto fail;
951
952 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
953 osd_req_op_init(req, which, opcode, 0);
954 } else {
955 u32 object_size = layout->object_size;
956 u32 object_base = off - objoff;
957 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
958 if (truncate_size <= object_base) {
959 truncate_size = 0;
960 } else {
961 truncate_size -= object_base;
962 if (truncate_size > object_size)
963 truncate_size = object_size;
964 }
965 }
966 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
967 truncate_size, truncate_seq);
968 }
969
970 req->r_abort_on_full = true;
971 req->r_flags = flags;
972 req->r_base_oloc.pool = layout->pool_id;
973 req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
974 ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
975
976 req->r_snapid = vino.snap;
977 if (flags & CEPH_OSD_FLAG_WRITE)
978 req->r_data_offset = off;
979
980 r = ceph_osdc_alloc_messages(req, GFP_NOFS);
981 if (r)
982 goto fail;
983
984 return req;
985
986 fail:
987 ceph_osdc_put_request(req);
988 return ERR_PTR(r);
989 }
990 EXPORT_SYMBOL(ceph_osdc_new_request);
991
992 /*
993 * We keep osd requests in an rbtree, sorted by ->r_tid.
994 */
995 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
996 DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
997
998 static bool osd_homeless(struct ceph_osd *osd)
999 {
1000 return osd->o_osd == CEPH_HOMELESS_OSD;
1001 }
1002
1003 static bool osd_registered(struct ceph_osd *osd)
1004 {
1005 verify_osdc_locked(osd->o_osdc);
1006
1007 return !RB_EMPTY_NODE(&osd->o_node);
1008 }
1009
1010 /*
1011 * Assumes @osd is zero-initialized.
1012 */
1013 static void osd_init(struct ceph_osd *osd)
1014 {
1015 refcount_set(&osd->o_ref, 1);
1016 RB_CLEAR_NODE(&osd->o_node);
1017 osd->o_requests = RB_ROOT;
1018 osd->o_linger_requests = RB_ROOT;
1019 osd->o_backoff_mappings = RB_ROOT;
1020 osd->o_backoffs_by_id = RB_ROOT;
1021 INIT_LIST_HEAD(&osd->o_osd_lru);
1022 INIT_LIST_HEAD(&osd->o_keepalive_item);
1023 osd->o_incarnation = 1;
1024 mutex_init(&osd->lock);
1025 }
1026
1027 static void osd_cleanup(struct ceph_osd *osd)
1028 {
1029 WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1030 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1031 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1032 WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoff_mappings));
1033 WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoffs_by_id));
1034 WARN_ON(!list_empty(&osd->o_osd_lru));
1035 WARN_ON(!list_empty(&osd->o_keepalive_item));
1036
1037 if (osd->o_auth.authorizer) {
1038 WARN_ON(osd_homeless(osd));
1039 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1040 }
1041 }
1042
1043 /*
1044 * Track open sessions with osds.
1045 */
1046 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1047 {
1048 struct ceph_osd *osd;
1049
1050 WARN_ON(onum == CEPH_HOMELESS_OSD);
1051
1052 osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1053 osd_init(osd);
1054 osd->o_osdc = osdc;
1055 osd->o_osd = onum;
1056
1057 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1058
1059 return osd;
1060 }
1061
1062 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1063 {
1064 if (refcount_inc_not_zero(&osd->o_ref)) {
1065 dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
1066 refcount_read(&osd->o_ref));
1067 return osd;
1068 } else {
1069 dout("get_osd %p FAIL\n", osd);
1070 return NULL;
1071 }
1072 }
1073
1074 static void put_osd(struct ceph_osd *osd)
1075 {
1076 dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
1077 refcount_read(&osd->o_ref) - 1);
1078 if (refcount_dec_and_test(&osd->o_ref)) {
1079 osd_cleanup(osd);
1080 kfree(osd);
1081 }
1082 }
1083
1084 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1085
1086 static void __move_osd_to_lru(struct ceph_osd *osd)
1087 {
1088 struct ceph_osd_client *osdc = osd->o_osdc;
1089
1090 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1091 BUG_ON(!list_empty(&osd->o_osd_lru));
1092
1093 spin_lock(&osdc->osd_lru_lock);
1094 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1095 spin_unlock(&osdc->osd_lru_lock);
1096
1097 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1098 }
1099
1100 static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1101 {
1102 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1103 RB_EMPTY_ROOT(&osd->o_linger_requests))
1104 __move_osd_to_lru(osd);
1105 }
1106
1107 static void __remove_osd_from_lru(struct ceph_osd *osd)
1108 {
1109 struct ceph_osd_client *osdc = osd->o_osdc;
1110
1111 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1112
1113 spin_lock(&osdc->osd_lru_lock);
1114 if (!list_empty(&osd->o_osd_lru))
1115 list_del_init(&osd->o_osd_lru);
1116 spin_unlock(&osdc->osd_lru_lock);
1117 }
1118
1119 /*
1120 * Close the connection and assign any leftover requests to the
1121 * homeless session.
1122 */
1123 static void close_osd(struct ceph_osd *osd)
1124 {
1125 struct ceph_osd_client *osdc = osd->o_osdc;
1126 struct rb_node *n;
1127
1128 verify_osdc_wrlocked(osdc);
1129 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1130
1131 ceph_con_close(&osd->o_con);
1132
1133 for (n = rb_first(&osd->o_requests); n; ) {
1134 struct ceph_osd_request *req =
1135 rb_entry(n, struct ceph_osd_request, r_node);
1136
1137 n = rb_next(n); /* unlink_request() */
1138
1139 dout(" reassigning req %p tid %llu\n", req, req->r_tid);
1140 unlink_request(osd, req);
1141 link_request(&osdc->homeless_osd, req);
1142 }
1143 for (n = rb_first(&osd->o_linger_requests); n; ) {
1144 struct ceph_osd_linger_request *lreq =
1145 rb_entry(n, struct ceph_osd_linger_request, node);
1146
1147 n = rb_next(n); /* unlink_linger() */
1148
1149 dout(" reassigning lreq %p linger_id %llu\n", lreq,
1150 lreq->linger_id);
1151 unlink_linger(osd, lreq);
1152 link_linger(&osdc->homeless_osd, lreq);
1153 }
1154 clear_backoffs(osd);
1155
1156 __remove_osd_from_lru(osd);
1157 erase_osd(&osdc->osds, osd);
1158 put_osd(osd);
1159 }
1160
1161 /*
1162 * reset osd connect
1163 */
1164 static int reopen_osd(struct ceph_osd *osd)
1165 {
1166 struct ceph_entity_addr *peer_addr;
1167
1168 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1169
1170 if (RB_EMPTY_ROOT(&osd->o_requests) &&
1171 RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1172 close_osd(osd);
1173 return -ENODEV;
1174 }
1175
1176 peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
1177 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1178 !ceph_con_opened(&osd->o_con)) {
1179 struct rb_node *n;
1180
1181 dout("osd addr hasn't changed and connection never opened, "
1182 "letting msgr retry\n");
1183 /* touch each r_stamp for handle_timeout()'s benfit */
1184 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
1185 struct ceph_osd_request *req =
1186 rb_entry(n, struct ceph_osd_request, r_node);
1187 req->r_stamp = jiffies;
1188 }
1189
1190 return -EAGAIN;
1191 }
1192
1193 ceph_con_close(&osd->o_con);
1194 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1195 osd->o_incarnation++;
1196
1197 return 0;
1198 }
1199
1200 static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
1201 bool wrlocked)
1202 {
1203 struct ceph_osd *osd;
1204
1205 if (wrlocked)
1206 verify_osdc_wrlocked(osdc);
1207 else
1208 verify_osdc_locked(osdc);
1209
1210 if (o != CEPH_HOMELESS_OSD)
1211 osd = lookup_osd(&osdc->osds, o);
1212 else
1213 osd = &osdc->homeless_osd;
1214 if (!osd) {
1215 if (!wrlocked)
1216 return ERR_PTR(-EAGAIN);
1217
1218 osd = create_osd(osdc, o);
1219 insert_osd(&osdc->osds, osd);
1220 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
1221 &osdc->osdmap->osd_addr[osd->o_osd]);
1222 }
1223
1224 dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
1225 return osd;
1226 }
1227
1228 /*
1229 * Create request <-> OSD session relation.
1230 *
1231 * @req has to be assigned a tid, @osd may be homeless.
1232 */
1233 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1234 {
1235 verify_osd_locked(osd);
1236 WARN_ON(!req->r_tid || req->r_osd);
1237 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1238 req, req->r_tid);
1239
1240 if (!osd_homeless(osd))
1241 __remove_osd_from_lru(osd);
1242 else
1243 atomic_inc(&osd->o_osdc->num_homeless);
1244
1245 get_osd(osd);
1246 insert_request(&osd->o_requests, req);
1247 req->r_osd = osd;
1248 }
1249
1250 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1251 {
1252 verify_osd_locked(osd);
1253 WARN_ON(req->r_osd != osd);
1254 dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1255 req, req->r_tid);
1256
1257 req->r_osd = NULL;
1258 erase_request(&osd->o_requests, req);
1259 put_osd(osd);
1260
1261 if (!osd_homeless(osd))
1262 maybe_move_osd_to_lru(osd);
1263 else
1264 atomic_dec(&osd->o_osdc->num_homeless);
1265 }
1266
1267 static bool __pool_full(struct ceph_pg_pool_info *pi)
1268 {
1269 return pi->flags & CEPH_POOL_FLAG_FULL;
1270 }
1271
1272 static bool have_pool_full(struct ceph_osd_client *osdc)
1273 {
1274 struct rb_node *n;
1275
1276 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
1277 struct ceph_pg_pool_info *pi =
1278 rb_entry(n, struct ceph_pg_pool_info, node);
1279
1280 if (__pool_full(pi))
1281 return true;
1282 }
1283
1284 return false;
1285 }
1286
1287 static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
1288 {
1289 struct ceph_pg_pool_info *pi;
1290
1291 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
1292 if (!pi)
1293 return false;
1294
1295 return __pool_full(pi);
1296 }
1297
1298 /*
1299 * Returns whether a request should be blocked from being sent
1300 * based on the current osdmap and osd_client settings.
1301 */
1302 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1303 const struct ceph_osd_request_target *t,
1304 struct ceph_pg_pool_info *pi)
1305 {
1306 bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
1307 bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
1308 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1309 __pool_full(pi);
1310
1311 WARN_ON(pi->id != t->target_oloc.pool);
1312 return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
1313 ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
1314 (osdc->osdmap->epoch < osdc->epoch_barrier);
1315 }
1316
1317 enum calc_target_result {
1318 CALC_TARGET_NO_ACTION = 0,
1319 CALC_TARGET_NEED_RESEND,
1320 CALC_TARGET_POOL_DNE,
1321 };
1322
1323 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1324 struct ceph_osd_request_target *t,
1325 struct ceph_connection *con,
1326 bool any_change)
1327 {
1328 struct ceph_pg_pool_info *pi;
1329 struct ceph_pg pgid, last_pgid;
1330 struct ceph_osds up, acting;
1331 bool force_resend = false;
1332 bool unpaused = false;
1333 bool legacy_change;
1334 bool split = false;
1335 bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1336 bool recovery_deletes = ceph_osdmap_flag(osdc,
1337 CEPH_OSDMAP_RECOVERY_DELETES);
1338 enum calc_target_result ct_res;
1339 int ret;
1340
1341 t->epoch = osdc->osdmap->epoch;
1342 pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1343 if (!pi) {
1344 t->osd = CEPH_HOMELESS_OSD;
1345 ct_res = CALC_TARGET_POOL_DNE;
1346 goto out;
1347 }
1348
1349 if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1350 if (t->last_force_resend < pi->last_force_request_resend) {
1351 t->last_force_resend = pi->last_force_request_resend;
1352 force_resend = true;
1353 } else if (t->last_force_resend == 0) {
1354 force_resend = true;
1355 }
1356 }
1357
1358 /* apply tiering */
1359 ceph_oid_copy(&t->target_oid, &t->base_oid);
1360 ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1361 if ((t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1362 if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
1363 t->target_oloc.pool = pi->read_tier;
1364 if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
1365 t->target_oloc.pool = pi->write_tier;
1366
1367 pi = ceph_pg_pool_by_id(osdc->osdmap, t->target_oloc.pool);
1368 if (!pi) {
1369 t->osd = CEPH_HOMELESS_OSD;
1370 ct_res = CALC_TARGET_POOL_DNE;
1371 goto out;
1372 }
1373 }
1374
1375 ret = __ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc,
1376 &pgid);
1377 if (ret) {
1378 WARN_ON(ret != -ENOENT);
1379 t->osd = CEPH_HOMELESS_OSD;
1380 ct_res = CALC_TARGET_POOL_DNE;
1381 goto out;
1382 }
1383 last_pgid.pool = pgid.pool;
1384 last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1385
1386 ceph_pg_to_up_acting_osds(osdc->osdmap, pi, &pgid, &up, &acting);
1387 if (any_change &&
1388 ceph_is_new_interval(&t->acting,
1389 &acting,
1390 &t->up,
1391 &up,
1392 t->size,
1393 pi->size,
1394 t->min_size,
1395 pi->min_size,
1396 t->pg_num,
1397 pi->pg_num,
1398 t->sort_bitwise,
1399 sort_bitwise,
1400 t->recovery_deletes,
1401 recovery_deletes,
1402 &last_pgid))
1403 force_resend = true;
1404
1405 if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1406 t->paused = false;
1407 unpaused = true;
1408 }
1409 legacy_change = ceph_pg_compare(&t->pgid, &pgid) ||
1410 ceph_osds_changed(&t->acting, &acting, any_change);
1411 if (t->pg_num)
1412 split = ceph_pg_is_split(&last_pgid, t->pg_num, pi->pg_num);
1413
1414 if (legacy_change || force_resend || split) {
1415 t->pgid = pgid; /* struct */
1416 ceph_pg_to_primary_shard(osdc->osdmap, pi, &pgid, &t->spgid);
1417 ceph_osds_copy(&t->acting, &acting);
1418 ceph_osds_copy(&t->up, &up);
1419 t->size = pi->size;
1420 t->min_size = pi->min_size;
1421 t->pg_num = pi->pg_num;
1422 t->pg_num_mask = pi->pg_num_mask;
1423 t->sort_bitwise = sort_bitwise;
1424 t->recovery_deletes = recovery_deletes;
1425
1426 t->osd = acting.primary;
1427 }
1428
1429 if (unpaused || legacy_change || force_resend ||
1430 (split && con && CEPH_HAVE_FEATURE(con->peer_features,
1431 RESEND_ON_SPLIT)))
1432 ct_res = CALC_TARGET_NEED_RESEND;
1433 else
1434 ct_res = CALC_TARGET_NO_ACTION;
1435
1436 out:
1437 dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
1438 return ct_res;
1439 }
1440
1441 static struct ceph_spg_mapping *alloc_spg_mapping(void)
1442 {
1443 struct ceph_spg_mapping *spg;
1444
1445 spg = kmalloc(sizeof(*spg), GFP_NOIO);
1446 if (!spg)
1447 return NULL;
1448
1449 RB_CLEAR_NODE(&spg->node);
1450 spg->backoffs = RB_ROOT;
1451 return spg;
1452 }
1453
1454 static void free_spg_mapping(struct ceph_spg_mapping *spg)
1455 {
1456 WARN_ON(!RB_EMPTY_NODE(&spg->node));
1457 WARN_ON(!RB_EMPTY_ROOT(&spg->backoffs));
1458
1459 kfree(spg);
1460 }
1461
1462 /*
1463 * rbtree of ceph_spg_mapping for handling map<spg_t, ...>, similar to
1464 * ceph_pg_mapping. Used to track OSD backoffs -- a backoff [range] is
1465 * defined only within a specific spgid; it does not pass anything to
1466 * children on split, or to another primary.
1467 */
1468 DEFINE_RB_FUNCS2(spg_mapping, struct ceph_spg_mapping, spgid, ceph_spg_compare,
1469 RB_BYPTR, const struct ceph_spg *, node)
1470
1471 static u64 hoid_get_bitwise_key(const struct ceph_hobject_id *hoid)
1472 {
1473 return hoid->is_max ? 0x100000000ull : hoid->hash_reverse_bits;
1474 }
1475
1476 static void hoid_get_effective_key(const struct ceph_hobject_id *hoid,
1477 void **pkey, size_t *pkey_len)
1478 {
1479 if (hoid->key_len) {
1480 *pkey = hoid->key;
1481 *pkey_len = hoid->key_len;
1482 } else {
1483 *pkey = hoid->oid;
1484 *pkey_len = hoid->oid_len;
1485 }
1486 }
1487
1488 static int compare_names(const void *name1, size_t name1_len,
1489 const void *name2, size_t name2_len)
1490 {
1491 int ret;
1492
1493 ret = memcmp(name1, name2, min(name1_len, name2_len));
1494 if (!ret) {
1495 if (name1_len < name2_len)
1496 ret = -1;
1497 else if (name1_len > name2_len)
1498 ret = 1;
1499 }
1500 return ret;
1501 }
1502
1503 static int hoid_compare(const struct ceph_hobject_id *lhs,
1504 const struct ceph_hobject_id *rhs)
1505 {
1506 void *effective_key1, *effective_key2;
1507 size_t effective_key1_len, effective_key2_len;
1508 int ret;
1509
1510 if (lhs->is_max < rhs->is_max)
1511 return -1;
1512 if (lhs->is_max > rhs->is_max)
1513 return 1;
1514
1515 if (lhs->pool < rhs->pool)
1516 return -1;
1517 if (lhs->pool > rhs->pool)
1518 return 1;
1519
1520 if (hoid_get_bitwise_key(lhs) < hoid_get_bitwise_key(rhs))
1521 return -1;
1522 if (hoid_get_bitwise_key(lhs) > hoid_get_bitwise_key(rhs))
1523 return 1;
1524
1525 ret = compare_names(lhs->nspace, lhs->nspace_len,
1526 rhs->nspace, rhs->nspace_len);
1527 if (ret)
1528 return ret;
1529
1530 hoid_get_effective_key(lhs, &effective_key1, &effective_key1_len);
1531 hoid_get_effective_key(rhs, &effective_key2, &effective_key2_len);
1532 ret = compare_names(effective_key1, effective_key1_len,
1533 effective_key2, effective_key2_len);
1534 if (ret)
1535 return ret;
1536
1537 ret = compare_names(lhs->oid, lhs->oid_len, rhs->oid, rhs->oid_len);
1538 if (ret)
1539 return ret;
1540
1541 if (lhs->snapid < rhs->snapid)
1542 return -1;
1543 if (lhs->snapid > rhs->snapid)
1544 return 1;
1545
1546 return 0;
1547 }
1548
1549 /*
1550 * For decoding ->begin and ->end of MOSDBackoff only -- no MIN/MAX
1551 * compat stuff here.
1552 *
1553 * Assumes @hoid is zero-initialized.
1554 */
1555 static int decode_hoid(void **p, void *end, struct ceph_hobject_id *hoid)
1556 {
1557 u8 struct_v;
1558 u32 struct_len;
1559 int ret;
1560
1561 ret = ceph_start_decoding(p, end, 4, "hobject_t", &struct_v,
1562 &struct_len);
1563 if (ret)
1564 return ret;
1565
1566 if (struct_v < 4) {
1567 pr_err("got struct_v %d < 4 of hobject_t\n", struct_v);
1568 goto e_inval;
1569 }
1570
1571 hoid->key = ceph_extract_encoded_string(p, end, &hoid->key_len,
1572 GFP_NOIO);
1573 if (IS_ERR(hoid->key)) {
1574 ret = PTR_ERR(hoid->key);
1575 hoid->key = NULL;
1576 return ret;
1577 }
1578
1579 hoid->oid = ceph_extract_encoded_string(p, end, &hoid->oid_len,
1580 GFP_NOIO);
1581 if (IS_ERR(hoid->oid)) {
1582 ret = PTR_ERR(hoid->oid);
1583 hoid->oid = NULL;
1584 return ret;
1585 }
1586
1587 ceph_decode_64_safe(p, end, hoid->snapid, e_inval);
1588 ceph_decode_32_safe(p, end, hoid->hash, e_inval);
1589 ceph_decode_8_safe(p, end, hoid->is_max, e_inval);
1590
1591 hoid->nspace = ceph_extract_encoded_string(p, end, &hoid->nspace_len,
1592 GFP_NOIO);
1593 if (IS_ERR(hoid->nspace)) {
1594 ret = PTR_ERR(hoid->nspace);
1595 hoid->nspace = NULL;
1596 return ret;
1597 }
1598
1599 ceph_decode_64_safe(p, end, hoid->pool, e_inval);
1600
1601 ceph_hoid_build_hash_cache(hoid);
1602 return 0;
1603
1604 e_inval:
1605 return -EINVAL;
1606 }
1607
1608 static int hoid_encoding_size(const struct ceph_hobject_id *hoid)
1609 {
1610 return 8 + 4 + 1 + 8 + /* snapid, hash, is_max, pool */
1611 4 + hoid->key_len + 4 + hoid->oid_len + 4 + hoid->nspace_len;
1612 }
1613
1614 static void encode_hoid(void **p, void *end, const struct ceph_hobject_id *hoid)
1615 {
1616 ceph_start_encoding(p, 4, 3, hoid_encoding_size(hoid));
1617 ceph_encode_string(p, end, hoid->key, hoid->key_len);
1618 ceph_encode_string(p, end, hoid->oid, hoid->oid_len);
1619 ceph_encode_64(p, hoid->snapid);
1620 ceph_encode_32(p, hoid->hash);
1621 ceph_encode_8(p, hoid->is_max);
1622 ceph_encode_string(p, end, hoid->nspace, hoid->nspace_len);
1623 ceph_encode_64(p, hoid->pool);
1624 }
1625
1626 static void free_hoid(struct ceph_hobject_id *hoid)
1627 {
1628 if (hoid) {
1629 kfree(hoid->key);
1630 kfree(hoid->oid);
1631 kfree(hoid->nspace);
1632 kfree(hoid);
1633 }
1634 }
1635
1636 static struct ceph_osd_backoff *alloc_backoff(void)
1637 {
1638 struct ceph_osd_backoff *backoff;
1639
1640 backoff = kzalloc(sizeof(*backoff), GFP_NOIO);
1641 if (!backoff)
1642 return NULL;
1643
1644 RB_CLEAR_NODE(&backoff->spg_node);
1645 RB_CLEAR_NODE(&backoff->id_node);
1646 return backoff;
1647 }
1648
1649 static void free_backoff(struct ceph_osd_backoff *backoff)
1650 {
1651 WARN_ON(!RB_EMPTY_NODE(&backoff->spg_node));
1652 WARN_ON(!RB_EMPTY_NODE(&backoff->id_node));
1653
1654 free_hoid(backoff->begin);
1655 free_hoid(backoff->end);
1656 kfree(backoff);
1657 }
1658
1659 /*
1660 * Within a specific spgid, backoffs are managed by ->begin hoid.
1661 */
1662 DEFINE_RB_INSDEL_FUNCS2(backoff, struct ceph_osd_backoff, begin, hoid_compare,
1663 RB_BYVAL, spg_node);
1664
1665 static struct ceph_osd_backoff *lookup_containing_backoff(struct rb_root *root,
1666 const struct ceph_hobject_id *hoid)
1667 {
1668 struct rb_node *n = root->rb_node;
1669
1670 while (n) {
1671 struct ceph_osd_backoff *cur =
1672 rb_entry(n, struct ceph_osd_backoff, spg_node);
1673 int cmp;
1674
1675 cmp = hoid_compare(hoid, cur->begin);
1676 if (cmp < 0) {
1677 n = n->rb_left;
1678 } else if (cmp > 0) {
1679 if (hoid_compare(hoid, cur->end) < 0)
1680 return cur;
1681
1682 n = n->rb_right;
1683 } else {
1684 return cur;
1685 }
1686 }
1687
1688 return NULL;
1689 }
1690
1691 /*
1692 * Each backoff has a unique id within its OSD session.
1693 */
1694 DEFINE_RB_FUNCS(backoff_by_id, struct ceph_osd_backoff, id, id_node)
1695
1696 static void clear_backoffs(struct ceph_osd *osd)
1697 {
1698 while (!RB_EMPTY_ROOT(&osd->o_backoff_mappings)) {
1699 struct ceph_spg_mapping *spg =
1700 rb_entry(rb_first(&osd->o_backoff_mappings),
1701 struct ceph_spg_mapping, node);
1702
1703 while (!RB_EMPTY_ROOT(&spg->backoffs)) {
1704 struct ceph_osd_backoff *backoff =
1705 rb_entry(rb_first(&spg->backoffs),
1706 struct ceph_osd_backoff, spg_node);
1707
1708 erase_backoff(&spg->backoffs, backoff);
1709 erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
1710 free_backoff(backoff);
1711 }
1712 erase_spg_mapping(&osd->o_backoff_mappings, spg);
1713 free_spg_mapping(spg);
1714 }
1715 }
1716
1717 /*
1718 * Set up a temporary, non-owning view into @t.
1719 */
1720 static void hoid_fill_from_target(struct ceph_hobject_id *hoid,
1721 const struct ceph_osd_request_target *t)
1722 {
1723 hoid->key = NULL;
1724 hoid->key_len = 0;
1725 hoid->oid = t->target_oid.name;
1726 hoid->oid_len = t->target_oid.name_len;
1727 hoid->snapid = CEPH_NOSNAP;
1728 hoid->hash = t->pgid.seed;
1729 hoid->is_max = false;
1730 if (t->target_oloc.pool_ns) {
1731 hoid->nspace = t->target_oloc.pool_ns->str;
1732 hoid->nspace_len = t->target_oloc.pool_ns->len;
1733 } else {
1734 hoid->nspace = NULL;
1735 hoid->nspace_len = 0;
1736 }
1737 hoid->pool = t->target_oloc.pool;
1738 ceph_hoid_build_hash_cache(hoid);
1739 }
1740
1741 static bool should_plug_request(struct ceph_osd_request *req)
1742 {
1743 struct ceph_osd *osd = req->r_osd;
1744 struct ceph_spg_mapping *spg;
1745 struct ceph_osd_backoff *backoff;
1746 struct ceph_hobject_id hoid;
1747
1748 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &req->r_t.spgid);
1749 if (!spg)
1750 return false;
1751
1752 hoid_fill_from_target(&hoid, &req->r_t);
1753 backoff = lookup_containing_backoff(&spg->backoffs, &hoid);
1754 if (!backoff)
1755 return false;
1756
1757 dout("%s req %p tid %llu backoff osd%d spgid %llu.%xs%d id %llu\n",
1758 __func__, req, req->r_tid, osd->o_osd, backoff->spgid.pgid.pool,
1759 backoff->spgid.pgid.seed, backoff->spgid.shard, backoff->id);
1760 return true;
1761 }
1762
1763 static void setup_request_data(struct ceph_osd_request *req,
1764 struct ceph_msg *msg)
1765 {
1766 u32 data_len = 0;
1767 int i;
1768
1769 if (!list_empty(&msg->data))
1770 return;
1771
1772 WARN_ON(msg->data_length);
1773 for (i = 0; i < req->r_num_ops; i++) {
1774 struct ceph_osd_req_op *op = &req->r_ops[i];
1775
1776 switch (op->op) {
1777 /* request */
1778 case CEPH_OSD_OP_WRITE:
1779 case CEPH_OSD_OP_WRITEFULL:
1780 WARN_ON(op->indata_len != op->extent.length);
1781 ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
1782 break;
1783 case CEPH_OSD_OP_SETXATTR:
1784 case CEPH_OSD_OP_CMPXATTR:
1785 WARN_ON(op->indata_len != op->xattr.name_len +
1786 op->xattr.value_len);
1787 ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
1788 break;
1789 case CEPH_OSD_OP_NOTIFY_ACK:
1790 ceph_osdc_msg_data_add(msg,
1791 &op->notify_ack.request_data);
1792 break;
1793
1794 /* reply */
1795 case CEPH_OSD_OP_STAT:
1796 ceph_osdc_msg_data_add(req->r_reply,
1797 &op->raw_data_in);
1798 break;
1799 case CEPH_OSD_OP_READ:
1800 ceph_osdc_msg_data_add(req->r_reply,
1801 &op->extent.osd_data);
1802 break;
1803 case CEPH_OSD_OP_LIST_WATCHERS:
1804 ceph_osdc_msg_data_add(req->r_reply,
1805 &op->list_watchers.response_data);
1806 break;
1807
1808 /* both */
1809 case CEPH_OSD_OP_CALL:
1810 WARN_ON(op->indata_len != op->cls.class_len +
1811 op->cls.method_len +
1812 op->cls.indata_len);
1813 ceph_osdc_msg_data_add(msg, &op->cls.request_info);
1814 /* optional, can be NONE */
1815 ceph_osdc_msg_data_add(msg, &op->cls.request_data);
1816 /* optional, can be NONE */
1817 ceph_osdc_msg_data_add(req->r_reply,
1818 &op->cls.response_data);
1819 break;
1820 case CEPH_OSD_OP_NOTIFY:
1821 ceph_osdc_msg_data_add(msg,
1822 &op->notify.request_data);
1823 ceph_osdc_msg_data_add(req->r_reply,
1824 &op->notify.response_data);
1825 break;
1826 }
1827
1828 data_len += op->indata_len;
1829 }
1830
1831 WARN_ON(data_len != msg->data_length);
1832 }
1833
1834 static void encode_pgid(void **p, const struct ceph_pg *pgid)
1835 {
1836 ceph_encode_8(p, 1);
1837 ceph_encode_64(p, pgid->pool);
1838 ceph_encode_32(p, pgid->seed);
1839 ceph_encode_32(p, -1); /* preferred */
1840 }
1841
1842 static void encode_spgid(void **p, const struct ceph_spg *spgid)
1843 {
1844 ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
1845 encode_pgid(p, &spgid->pgid);
1846 ceph_encode_8(p, spgid->shard);
1847 }
1848
1849 static void encode_oloc(void **p, void *end,
1850 const struct ceph_object_locator *oloc)
1851 {
1852 ceph_start_encoding(p, 5, 4, ceph_oloc_encoding_size(oloc));
1853 ceph_encode_64(p, oloc->pool);
1854 ceph_encode_32(p, -1); /* preferred */
1855 ceph_encode_32(p, 0); /* key len */
1856 if (oloc->pool_ns)
1857 ceph_encode_string(p, end, oloc->pool_ns->str,
1858 oloc->pool_ns->len);
1859 else
1860 ceph_encode_32(p, 0);
1861 }
1862
1863 static void encode_request_partial(struct ceph_osd_request *req,
1864 struct ceph_msg *msg)
1865 {
1866 void *p = msg->front.iov_base;
1867 void *const end = p + msg->front_alloc_len;
1868 u32 data_len = 0;
1869 int i;
1870
1871 if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
1872 /* snapshots aren't writeable */
1873 WARN_ON(req->r_snapid != CEPH_NOSNAP);
1874 } else {
1875 WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
1876 req->r_data_offset || req->r_snapc);
1877 }
1878
1879 setup_request_data(req, msg);
1880
1881 encode_spgid(&p, &req->r_t.spgid); /* actual spg */
1882 ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */
1883 ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
1884 ceph_encode_32(&p, req->r_flags);
1885
1886 /* reqid */
1887 ceph_start_encoding(&p, 2, 2, sizeof(struct ceph_osd_reqid));
1888 memset(p, 0, sizeof(struct ceph_osd_reqid));
1889 p += sizeof(struct ceph_osd_reqid);
1890
1891 /* trace */
1892 memset(p, 0, sizeof(struct ceph_blkin_trace_info));
1893 p += sizeof(struct ceph_blkin_trace_info);
1894
1895 ceph_encode_32(&p, 0); /* client_inc, always 0 */
1896 ceph_encode_timespec(p, &req->r_mtime);
1897 p += sizeof(struct ceph_timespec);
1898
1899 encode_oloc(&p, end, &req->r_t.target_oloc);
1900 ceph_encode_string(&p, end, req->r_t.target_oid.name,
1901 req->r_t.target_oid.name_len);
1902
1903 /* ops, can imply data */
1904 ceph_encode_16(&p, req->r_num_ops);
1905 for (i = 0; i < req->r_num_ops; i++) {
1906 data_len += osd_req_encode_op(p, &req->r_ops[i]);
1907 p += sizeof(struct ceph_osd_op);
1908 }
1909
1910 ceph_encode_64(&p, req->r_snapid); /* snapid */
1911 if (req->r_snapc) {
1912 ceph_encode_64(&p, req->r_snapc->seq);
1913 ceph_encode_32(&p, req->r_snapc->num_snaps);
1914 for (i = 0; i < req->r_snapc->num_snaps; i++)
1915 ceph_encode_64(&p, req->r_snapc->snaps[i]);
1916 } else {
1917 ceph_encode_64(&p, 0); /* snap_seq */
1918 ceph_encode_32(&p, 0); /* snaps len */
1919 }
1920
1921 ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
1922 BUG_ON(p > end - 8); /* space for features */
1923
1924 msg->hdr.version = cpu_to_le16(8); /* MOSDOp v8 */
1925 /* front_len is finalized in encode_request_finish() */
1926 msg->front.iov_len = p - msg->front.iov_base;
1927 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1928 msg->hdr.data_len = cpu_to_le32(data_len);
1929 /*
1930 * The header "data_off" is a hint to the receiver allowing it
1931 * to align received data into its buffers such that there's no
1932 * need to re-copy it before writing it to disk (direct I/O).
1933 */
1934 msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
1935
1936 dout("%s req %p msg %p oid %s oid_len %d\n", __func__, req, msg,
1937 req->r_t.target_oid.name, req->r_t.target_oid.name_len);
1938 }
1939
1940 static void encode_request_finish(struct ceph_msg *msg)
1941 {
1942 void *p = msg->front.iov_base;
1943 void *const partial_end = p + msg->front.iov_len;
1944 void *const end = p + msg->front_alloc_len;
1945
1946 if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {
1947 /* luminous OSD -- encode features and be done */
1948 p = partial_end;
1949 ceph_encode_64(&p, msg->con->peer_features);
1950 } else {
1951 struct {
1952 char spgid[CEPH_ENCODING_START_BLK_LEN +
1953 CEPH_PGID_ENCODING_LEN + 1];
1954 __le32 hash;
1955 __le32 epoch;
1956 __le32 flags;
1957 char reqid[CEPH_ENCODING_START_BLK_LEN +
1958 sizeof(struct ceph_osd_reqid)];
1959 char trace[sizeof(struct ceph_blkin_trace_info)];
1960 __le32 client_inc;
1961 struct ceph_timespec mtime;
1962 } __packed head;
1963 struct ceph_pg pgid;
1964 void *oloc, *oid, *tail;
1965 int oloc_len, oid_len, tail_len;
1966 int len;
1967
1968 /*
1969 * Pre-luminous OSD -- reencode v8 into v4 using @head
1970 * as a temporary buffer. Encode the raw PG; the rest
1971 * is just a matter of moving oloc, oid and tail blobs
1972 * around.
1973 */
1974 memcpy(&head, p, sizeof(head));
1975 p += sizeof(head);
1976
1977 oloc = p;
1978 p += CEPH_ENCODING_START_BLK_LEN;
1979 pgid.pool = ceph_decode_64(&p);
1980 p += 4 + 4; /* preferred, key len */
1981 len = ceph_decode_32(&p);
1982 p += len; /* nspace */
1983 oloc_len = p - oloc;
1984
1985 oid = p;
1986 len = ceph_decode_32(&p);
1987 p += len;
1988 oid_len = p - oid;
1989
1990 tail = p;
1991 tail_len = partial_end - p;
1992
1993 p = msg->front.iov_base;
1994 ceph_encode_copy(&p, &head.client_inc, sizeof(head.client_inc));
1995 ceph_encode_copy(&p, &head.epoch, sizeof(head.epoch));
1996 ceph_encode_copy(&p, &head.flags, sizeof(head.flags));
1997 ceph_encode_copy(&p, &head.mtime, sizeof(head.mtime));
1998
1999 /* reassert_version */
2000 memset(p, 0, sizeof(struct ceph_eversion));
2001 p += sizeof(struct ceph_eversion);
2002
2003 BUG_ON(p >= oloc);
2004 memmove(p, oloc, oloc_len);
2005 p += oloc_len;
2006
2007 pgid.seed = le32_to_cpu(head.hash);
2008 encode_pgid(&p, &pgid); /* raw pg */
2009
2010 BUG_ON(p >= oid);
2011 memmove(p, oid, oid_len);
2012 p += oid_len;
2013
2014 /* tail -- ops, snapid, snapc, retry_attempt */
2015 BUG_ON(p >= tail);
2016 memmove(p, tail, tail_len);
2017 p += tail_len;
2018
2019 msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
2020 }
2021
2022 BUG_ON(p > end);
2023 msg->front.iov_len = p - msg->front.iov_base;
2024 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2025
2026 dout("%s msg %p tid %llu %u+%u+%u v%d\n", __func__, msg,
2027 le64_to_cpu(msg->hdr.tid), le32_to_cpu(msg->hdr.front_len),
2028 le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len),
2029 le16_to_cpu(msg->hdr.version));
2030 }
2031
2032 /*
2033 * @req has to be assigned a tid and registered.
2034 */
2035 static void send_request(struct ceph_osd_request *req)
2036 {
2037 struct ceph_osd *osd = req->r_osd;
2038
2039 verify_osd_locked(osd);
2040 WARN_ON(osd->o_osd != req->r_t.osd);
2041
2042 /* backoff? */
2043 if (should_plug_request(req))
2044 return;
2045
2046 /*
2047 * We may have a previously queued request message hanging
2048 * around. Cancel it to avoid corrupting the msgr.
2049 */
2050 if (req->r_sent)
2051 ceph_msg_revoke(req->r_request);
2052
2053 req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
2054 if (req->r_attempts)
2055 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2056 else
2057 WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);
2058
2059 encode_request_partial(req, req->r_request);
2060
2061 dout("%s req %p tid %llu to pgid %llu.%x spgid %llu.%xs%d osd%d e%u flags 0x%x attempt %d\n",
2062 __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
2063 req->r_t.spgid.pgid.pool, req->r_t.spgid.pgid.seed,
2064 req->r_t.spgid.shard, osd->o_osd, req->r_t.epoch, req->r_flags,
2065 req->r_attempts);
2066
2067 req->r_t.paused = false;
2068 req->r_stamp = jiffies;
2069 req->r_attempts++;
2070
2071 req->r_sent = osd->o_incarnation;
2072 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
2073 ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
2074 }
2075
2076 static void maybe_request_map(struct ceph_osd_client *osdc)
2077 {
2078 bool continuous = false;
2079
2080 verify_osdc_locked(osdc);
2081 WARN_ON(!osdc->osdmap->epoch);
2082
2083 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2084 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
2085 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2086 dout("%s osdc %p continuous\n", __func__, osdc);
2087 continuous = true;
2088 } else {
2089 dout("%s osdc %p onetime\n", __func__, osdc);
2090 }
2091
2092 if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2093 osdc->osdmap->epoch + 1, continuous))
2094 ceph_monc_renew_subs(&osdc->client->monc);
2095 }
2096
2097 static void complete_request(struct ceph_osd_request *req, int err);
2098 static void send_map_check(struct ceph_osd_request *req);
2099
2100 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
2101 {
2102 struct ceph_osd_client *osdc = req->r_osdc;
2103 struct ceph_osd *osd;
2104 enum calc_target_result ct_res;
2105 bool need_send = false;
2106 bool promoted = false;
2107 bool need_abort = false;
2108
2109 WARN_ON(req->r_tid);
2110 dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
2111
2112 again:
2113 ct_res = calc_target(osdc, &req->r_t, NULL, false);
2114 if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
2115 goto promote;
2116
2117 osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
2118 if (IS_ERR(osd)) {
2119 WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
2120 goto promote;
2121 }
2122
2123 if (osdc->osdmap->epoch < osdc->epoch_barrier) {
2124 dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
2125 osdc->epoch_barrier);
2126 req->r_t.paused = true;
2127 maybe_request_map(osdc);
2128 } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2129 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2130 dout("req %p pausewr\n", req);
2131 req->r_t.paused = true;
2132 maybe_request_map(osdc);
2133 } else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
2134 ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2135 dout("req %p pauserd\n", req);
2136 req->r_t.paused = true;
2137 maybe_request_map(osdc);
2138 } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2139 !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
2140 CEPH_OSD_FLAG_FULL_FORCE)) &&
2141 (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2142 pool_full(osdc, req->r_t.base_oloc.pool))) {
2143 dout("req %p full/pool_full\n", req);
2144 pr_warn_ratelimited("FULL or reached pool quota\n");
2145 req->r_t.paused = true;
2146 maybe_request_map(osdc);
2147 if (req->r_abort_on_full)
2148 need_abort = true;
2149 } else if (!osd_homeless(osd)) {
2150 need_send = true;
2151 } else {
2152 maybe_request_map(osdc);
2153 }
2154
2155 mutex_lock(&osd->lock);
2156 /*
2157 * Assign the tid atomically with send_request() to protect
2158 * multiple writes to the same object from racing with each
2159 * other, resulting in out of order ops on the OSDs.
2160 */
2161 req->r_tid = atomic64_inc_return(&osdc->last_tid);
2162 link_request(osd, req);
2163 if (need_send)
2164 send_request(req);
2165 else if (need_abort)
2166 complete_request(req, -ENOSPC);
2167 mutex_unlock(&osd->lock);
2168
2169 if (ct_res == CALC_TARGET_POOL_DNE)
2170 send_map_check(req);
2171
2172 if (promoted)
2173 downgrade_write(&osdc->lock);
2174 return;
2175
2176 promote:
2177 up_read(&osdc->lock);
2178 down_write(&osdc->lock);
2179 wrlocked = true;
2180 promoted = true;
2181 goto again;
2182 }
2183
2184 static void account_request(struct ceph_osd_request *req)
2185 {
2186 WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
2187 WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
2188
2189 req->r_flags |= CEPH_OSD_FLAG_ONDISK;
2190 atomic_inc(&req->r_osdc->num_requests);
2191
2192 req->r_start_stamp = jiffies;
2193 }
2194
2195 static void submit_request(struct ceph_osd_request *req, bool wrlocked)
2196 {
2197 ceph_osdc_get_request(req);
2198 account_request(req);
2199 __submit_request(req, wrlocked);
2200 }
2201
2202 static void finish_request(struct ceph_osd_request *req)
2203 {
2204 struct ceph_osd_client *osdc = req->r_osdc;
2205
2206 WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
2207 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2208
2209 if (req->r_osd)
2210 unlink_request(req->r_osd, req);
2211 atomic_dec(&osdc->num_requests);
2212
2213 /*
2214 * If an OSD has failed or returned and a request has been sent
2215 * twice, it's possible to get a reply and end up here while the
2216 * request message is queued for delivery. We will ignore the
2217 * reply, so not a big deal, but better to try and catch it.
2218 */
2219 ceph_msg_revoke(req->r_request);
2220 ceph_msg_revoke_incoming(req->r_reply);
2221 }
2222
2223 static void __complete_request(struct ceph_osd_request *req)
2224 {
2225 if (req->r_callback) {
2226 dout("%s req %p tid %llu cb %pf result %d\n", __func__, req,
2227 req->r_tid, req->r_callback, req->r_result);
2228 req->r_callback(req);
2229 }
2230 }
2231
2232 /*
2233 * This is open-coded in handle_reply().
2234 */
2235 static void complete_request(struct ceph_osd_request *req, int err)
2236 {
2237 dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2238
2239 req->r_result = err;
2240 finish_request(req);
2241 __complete_request(req);
2242 complete_all(&req->r_completion);
2243 ceph_osdc_put_request(req);
2244 }
2245
2246 static void cancel_map_check(struct ceph_osd_request *req)
2247 {
2248 struct ceph_osd_client *osdc = req->r_osdc;
2249 struct ceph_osd_request *lookup_req;
2250
2251 verify_osdc_wrlocked(osdc);
2252
2253 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2254 if (!lookup_req)
2255 return;
2256
2257 WARN_ON(lookup_req != req);
2258 erase_request_mc(&osdc->map_checks, req);
2259 ceph_osdc_put_request(req);
2260 }
2261
2262 static void cancel_request(struct ceph_osd_request *req)
2263 {
2264 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2265
2266 cancel_map_check(req);
2267 finish_request(req);
2268 complete_all(&req->r_completion);
2269 ceph_osdc_put_request(req);
2270 }
2271
2272 static void abort_request(struct ceph_osd_request *req, int err)
2273 {
2274 dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2275
2276 cancel_map_check(req);
2277 complete_request(req, err);
2278 }
2279
2280 static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2281 {
2282 if (likely(eb > osdc->epoch_barrier)) {
2283 dout("updating epoch_barrier from %u to %u\n",
2284 osdc->epoch_barrier, eb);
2285 osdc->epoch_barrier = eb;
2286 /* Request map if we're not to the barrier yet */
2287 if (eb > osdc->osdmap->epoch)
2288 maybe_request_map(osdc);
2289 }
2290 }
2291
2292 void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2293 {
2294 down_read(&osdc->lock);
2295 if (unlikely(eb > osdc->epoch_barrier)) {
2296 up_read(&osdc->lock);
2297 down_write(&osdc->lock);
2298 update_epoch_barrier(osdc, eb);
2299 up_write(&osdc->lock);
2300 } else {
2301 up_read(&osdc->lock);
2302 }
2303 }
2304 EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);
2305
2306 /*
2307 * Drop all pending requests that are stalled waiting on a full condition to
2308 * clear, and complete them with ENOSPC as the return code. Set the
2309 * osdc->epoch_barrier to the latest map epoch that we've seen if any were
2310 * cancelled.
2311 */
2312 static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
2313 {
2314 struct rb_node *n;
2315 bool victims = false;
2316
2317 dout("enter abort_on_full\n");
2318
2319 if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
2320 goto out;
2321
2322 /* Scan list and see if there is anything to abort */
2323 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2324 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2325 struct rb_node *m;
2326
2327 m = rb_first(&osd->o_requests);
2328 while (m) {
2329 struct ceph_osd_request *req = rb_entry(m,
2330 struct ceph_osd_request, r_node);
2331 m = rb_next(m);
2332
2333 if (req->r_abort_on_full) {
2334 victims = true;
2335 break;
2336 }
2337 }
2338 if (victims)
2339 break;
2340 }
2341
2342 if (!victims)
2343 goto out;
2344
2345 /*
2346 * Update the barrier to current epoch if it's behind that point,
2347 * since we know we have some calls to be aborted in the tree.
2348 */
2349 update_epoch_barrier(osdc, osdc->osdmap->epoch);
2350
2351 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2352 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2353 struct rb_node *m;
2354
2355 m = rb_first(&osd->o_requests);
2356 while (m) {
2357 struct ceph_osd_request *req = rb_entry(m,
2358 struct ceph_osd_request, r_node);
2359 m = rb_next(m);
2360
2361 if (req->r_abort_on_full &&
2362 (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2363 pool_full(osdc, req->r_t.target_oloc.pool)))
2364 abort_request(req, -ENOSPC);
2365 }
2366 }
2367 out:
2368 dout("return abort_on_full barrier=%u\n", osdc->epoch_barrier);
2369 }
2370
2371 static void check_pool_dne(struct ceph_osd_request *req)
2372 {
2373 struct ceph_osd_client *osdc = req->r_osdc;
2374 struct ceph_osdmap *map = osdc->osdmap;
2375
2376 verify_osdc_wrlocked(osdc);
2377 WARN_ON(!map->epoch);
2378
2379 if (req->r_attempts) {
2380 /*
2381 * We sent a request earlier, which means that
2382 * previously the pool existed, and now it does not
2383 * (i.e., it was deleted).
2384 */
2385 req->r_map_dne_bound = map->epoch;
2386 dout("%s req %p tid %llu pool disappeared\n", __func__, req,
2387 req->r_tid);
2388 } else {
2389 dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
2390 req, req->r_tid, req->r_map_dne_bound, map->epoch);
2391 }
2392
2393 if (req->r_map_dne_bound) {
2394 if (map->epoch >= req->r_map_dne_bound) {
2395 /* we had a new enough map */
2396 pr_info_ratelimited("tid %llu pool does not exist\n",
2397 req->r_tid);
2398 complete_request(req, -ENOENT);
2399 }
2400 } else {
2401 send_map_check(req);
2402 }
2403 }
2404
2405 static void map_check_cb(struct ceph_mon_generic_request *greq)
2406 {
2407 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2408 struct ceph_osd_request *req;
2409 u64 tid = greq->private_data;
2410
2411 WARN_ON(greq->result || !greq->u.newest);
2412
2413 down_write(&osdc->lock);
2414 req = lookup_request_mc(&osdc->map_checks, tid);
2415 if (!req) {
2416 dout("%s tid %llu dne\n", __func__, tid);
2417 goto out_unlock;
2418 }
2419
2420 dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
2421 req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
2422 if (!req->r_map_dne_bound)
2423 req->r_map_dne_bound = greq->u.newest;
2424 erase_request_mc(&osdc->map_checks, req);
2425 check_pool_dne(req);
2426
2427 ceph_osdc_put_request(req);
2428 out_unlock:
2429 up_write(&osdc->lock);
2430 }
2431
2432 static void send_map_check(struct ceph_osd_request *req)
2433 {
2434 struct ceph_osd_client *osdc = req->r_osdc;
2435 struct ceph_osd_request *lookup_req;
2436 int ret;
2437
2438 verify_osdc_wrlocked(osdc);
2439
2440 lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2441 if (lookup_req) {
2442 WARN_ON(lookup_req != req);
2443 return;
2444 }
2445
2446 ceph_osdc_get_request(req);
2447 insert_request_mc(&osdc->map_checks, req);
2448 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
2449 map_check_cb, req->r_tid);
2450 WARN_ON(ret);
2451 }
2452
2453 /*
2454 * lingering requests, watch/notify v2 infrastructure
2455 */
2456 static void linger_release(struct kref *kref)
2457 {
2458 struct ceph_osd_linger_request *lreq =
2459 container_of(kref, struct ceph_osd_linger_request, kref);
2460
2461 dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
2462 lreq->reg_req, lreq->ping_req);
2463 WARN_ON(!RB_EMPTY_NODE(&lreq->node));
2464 WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
2465 WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
2466 WARN_ON(!list_empty(&lreq->scan_item));
2467 WARN_ON(!list_empty(&lreq->pending_lworks));
2468 WARN_ON(lreq->osd);
2469
2470 if (lreq->reg_req)
2471 ceph_osdc_put_request(lreq->reg_req);
2472 if (lreq->ping_req)
2473 ceph_osdc_put_request(lreq->ping_req);
2474 target_destroy(&lreq->t);
2475 kfree(lreq);
2476 }
2477
2478 static void linger_put(struct ceph_osd_linger_request *lreq)
2479 {
2480 if (lreq)
2481 kref_put(&lreq->kref, linger_release);
2482 }
2483
2484 static struct ceph_osd_linger_request *
2485 linger_get(struct ceph_osd_linger_request *lreq)
2486 {
2487 kref_get(&lreq->kref);
2488 return lreq;
2489 }
2490
2491 static struct ceph_osd_linger_request *
2492 linger_alloc(struct ceph_osd_client *osdc)
2493 {
2494 struct ceph_osd_linger_request *lreq;
2495
2496 lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
2497 if (!lreq)
2498 return NULL;
2499
2500 kref_init(&lreq->kref);
2501 mutex_init(&lreq->lock);
2502 RB_CLEAR_NODE(&lreq->node);
2503 RB_CLEAR_NODE(&lreq->osdc_node);
2504 RB_CLEAR_NODE(&lreq->mc_node);
2505 INIT_LIST_HEAD(&lreq->scan_item);
2506 INIT_LIST_HEAD(&lreq->pending_lworks);
2507 init_completion(&lreq->reg_commit_wait);
2508 init_completion(&lreq->notify_finish_wait);
2509
2510 lreq->osdc = osdc;
2511 target_init(&lreq->t);
2512
2513 dout("%s lreq %p\n", __func__, lreq);
2514 return lreq;
2515 }
2516
2517 DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
2518 DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
2519 DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
2520
2521 /*
2522 * Create linger request <-> OSD session relation.
2523 *
2524 * @lreq has to be registered, @osd may be homeless.
2525 */
2526 static void link_linger(struct ceph_osd *osd,
2527 struct ceph_osd_linger_request *lreq)
2528 {
2529 verify_osd_locked(osd);
2530 WARN_ON(!lreq->linger_id || lreq->osd);
2531 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2532 osd->o_osd, lreq, lreq->linger_id);
2533
2534 if (!osd_homeless(osd))
2535 __remove_osd_from_lru(osd);
2536 else
2537 atomic_inc(&osd->o_osdc->num_homeless);
2538
2539 get_osd(osd);
2540 insert_linger(&osd->o_linger_requests, lreq);
2541 lreq->osd = osd;
2542 }
2543
2544 static void unlink_linger(struct ceph_osd *osd,
2545 struct ceph_osd_linger_request *lreq)
2546 {
2547 verify_osd_locked(osd);
2548 WARN_ON(lreq->osd != osd);
2549 dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2550 osd->o_osd, lreq, lreq->linger_id);
2551
2552 lreq->osd = NULL;
2553 erase_linger(&osd->o_linger_requests, lreq);
2554 put_osd(osd);
2555
2556 if (!osd_homeless(osd))
2557 maybe_move_osd_to_lru(osd);
2558 else
2559 atomic_dec(&osd->o_osdc->num_homeless);
2560 }
2561
2562 static bool __linger_registered(struct ceph_osd_linger_request *lreq)
2563 {
2564 verify_osdc_locked(lreq->osdc);
2565
2566 return !RB_EMPTY_NODE(&lreq->osdc_node);
2567 }
2568
2569 static bool linger_registered(struct ceph_osd_linger_request *lreq)
2570 {
2571 struct ceph_osd_client *osdc = lreq->osdc;
2572 bool registered;
2573
2574 down_read(&osdc->lock);
2575 registered = __linger_registered(lreq);
2576 up_read(&osdc->lock);
2577
2578 return registered;
2579 }
2580
2581 static void linger_register(struct ceph_osd_linger_request *lreq)
2582 {
2583 struct ceph_osd_client *osdc = lreq->osdc;
2584
2585 verify_osdc_wrlocked(osdc);
2586 WARN_ON(lreq->linger_id);
2587
2588 linger_get(lreq);
2589 lreq->linger_id = ++osdc->last_linger_id;
2590 insert_linger_osdc(&osdc->linger_requests, lreq);
2591 }
2592
2593 static void linger_unregister(struct ceph_osd_linger_request *lreq)
2594 {
2595 struct ceph_osd_client *osdc = lreq->osdc;
2596
2597 verify_osdc_wrlocked(osdc);
2598
2599 erase_linger_osdc(&osdc->linger_requests, lreq);
2600 linger_put(lreq);
2601 }
2602
2603 static void cancel_linger_request(struct ceph_osd_request *req)
2604 {
2605 struct ceph_osd_linger_request *lreq = req->r_priv;
2606
2607 WARN_ON(!req->r_linger);
2608 cancel_request(req);
2609 linger_put(lreq);
2610 }
2611
2612 struct linger_work {
2613 struct work_struct work;
2614 struct ceph_osd_linger_request *lreq;
2615 struct list_head pending_item;
2616 unsigned long queued_stamp;
2617
2618 union {
2619 struct {
2620 u64 notify_id;
2621 u64 notifier_id;
2622 void *payload; /* points into @msg front */
2623 size_t payload_len;
2624
2625 struct ceph_msg *msg; /* for ceph_msg_put() */
2626 } notify;
2627 struct {
2628 int err;
2629 } error;
2630 };
2631 };
2632
2633 static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
2634 work_func_t workfn)
2635 {
2636 struct linger_work *lwork;
2637
2638 lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
2639 if (!lwork)
2640 return NULL;
2641
2642 INIT_WORK(&lwork->work, workfn);
2643 INIT_LIST_HEAD(&lwork->pending_item);
2644 lwork->lreq = linger_get(lreq);
2645
2646 return lwork;
2647 }
2648
2649 static void lwork_free(struct linger_work *lwork)
2650 {
2651 struct ceph_osd_linger_request *lreq = lwork->lreq;
2652
2653 mutex_lock(&lreq->lock);
2654 list_del(&lwork->pending_item);
2655 mutex_unlock(&lreq->lock);
2656
2657 linger_put(lreq);
2658 kfree(lwork);
2659 }
2660
2661 static void lwork_queue(struct linger_work *lwork)
2662 {
2663 struct ceph_osd_linger_request *lreq = lwork->lreq;
2664 struct ceph_osd_client *osdc = lreq->osdc;
2665
2666 verify_lreq_locked(lreq);
2667 WARN_ON(!list_empty(&lwork->pending_item));
2668
2669 lwork->queued_stamp = jiffies;
2670 list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2671 queue_work(osdc->notify_wq, &lwork->work);
2672 }
2673
2674 static void do_watch_notify(struct work_struct *w)
2675 {
2676 struct linger_work *lwork = container_of(w, struct linger_work, work);
2677 struct ceph_osd_linger_request *lreq = lwork->lreq;
2678
2679 if (!linger_registered(lreq)) {
2680 dout("%s lreq %p not registered\n", __func__, lreq);
2681 goto out;
2682 }
2683
2684 WARN_ON(!lreq->is_watch);
2685 dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
2686 __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
2687 lwork->notify.payload_len);
2688 lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
2689 lwork->notify.notifier_id, lwork->notify.payload,
2690 lwork->notify.payload_len);
2691
2692 out:
2693 ceph_msg_put(lwork->notify.msg);
2694 lwork_free(lwork);
2695 }
2696
2697 static void do_watch_error(struct work_struct *w)
2698 {
2699 struct linger_work *lwork = container_of(w, struct linger_work, work);
2700 struct ceph_osd_linger_request *lreq = lwork->lreq;
2701
2702 if (!linger_registered(lreq)) {
2703 dout("%s lreq %p not registered\n", __func__, lreq);
2704 goto out;
2705 }
2706
2707 dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
2708 lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);
2709
2710 out:
2711 lwork_free(lwork);
2712 }
2713
2714 static void queue_watch_error(struct ceph_osd_linger_request *lreq)
2715 {
2716 struct linger_work *lwork;
2717
2718 lwork = lwork_alloc(lreq, do_watch_error);
2719 if (!lwork) {
2720 pr_err("failed to allocate error-lwork\n");
2721 return;
2722 }
2723
2724 lwork->error.err = lreq->last_error;
2725 lwork_queue(lwork);
2726 }
2727
2728 static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
2729 int result)
2730 {
2731 if (!completion_done(&lreq->reg_commit_wait)) {
2732 lreq->reg_commit_error = (result <= 0 ? result : 0);
2733 complete_all(&lreq->reg_commit_wait);
2734 }
2735 }
2736
2737 static void linger_commit_cb(struct ceph_osd_request *req)
2738 {
2739 struct ceph_osd_linger_request *lreq = req->r_priv;
2740
2741 mutex_lock(&lreq->lock);
2742 dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
2743 lreq->linger_id, req->r_result);
2744 linger_reg_commit_complete(lreq, req->r_result);
2745 lreq->committed = true;
2746
2747 if (!lreq->is_watch) {
2748 struct ceph_osd_data *osd_data =
2749 osd_req_op_data(req, 0, notify, response_data);
2750 void *p = page_address(osd_data->pages[0]);
2751
2752 WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
2753 osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
2754
2755 /* make note of the notify_id */
2756 if (req->r_ops[0].outdata_len >= sizeof(u64)) {
2757 lreq->notify_id = ceph_decode_64(&p);
2758 dout("lreq %p notify_id %llu\n", lreq,
2759 lreq->notify_id);
2760 } else {
2761 dout("lreq %p no notify_id\n", lreq);
2762 }
2763 }
2764
2765 mutex_unlock(&lreq->lock);
2766 linger_put(lreq);
2767 }
2768
2769 static int normalize_watch_error(int err)
2770 {
2771 /*
2772 * Translate ENOENT -> ENOTCONN so that a delete->disconnection
2773 * notification and a failure to reconnect because we raced with
2774 * the delete appear the same to the user.
2775 */
2776 if (err == -ENOENT)
2777 err = -ENOTCONN;
2778
2779 return err;
2780 }
2781
2782 static void linger_reconnect_cb(struct ceph_osd_request *req)
2783 {
2784 struct ceph_osd_linger_request *lreq = req->r_priv;
2785
2786 mutex_lock(&lreq->lock);
2787 dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
2788 lreq, lreq->linger_id, req->r_result, lreq->last_error);
2789 if (req->r_result < 0) {
2790 if (!lreq->last_error) {
2791 lreq->last_error = normalize_watch_error(req->r_result);
2792 queue_watch_error(lreq);
2793 }
2794 }
2795
2796 mutex_unlock(&lreq->lock);
2797 linger_put(lreq);
2798 }
2799
2800 static void send_linger(struct ceph_osd_linger_request *lreq)
2801 {
2802 struct ceph_osd_request *req = lreq->reg_req;
2803 struct ceph_osd_req_op *op = &req->r_ops[0];
2804
2805 verify_osdc_wrlocked(req->r_osdc);
2806 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2807
2808 if (req->r_osd)
2809 cancel_linger_request(req);
2810
2811 request_reinit(req);
2812 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
2813 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
2814 req->r_flags = lreq->t.flags;
2815 req->r_mtime = lreq->mtime;
2816
2817 mutex_lock(&lreq->lock);
2818 if (lreq->is_watch && lreq->committed) {
2819 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2820 op->watch.cookie != lreq->linger_id);
2821 op->watch.op = CEPH_OSD_WATCH_OP_RECONNECT;
2822 op->watch.gen = ++lreq->register_gen;
2823 dout("lreq %p reconnect register_gen %u\n", lreq,
2824 op->watch.gen);
2825 req->r_callback = linger_reconnect_cb;
2826 } else {
2827 if (!lreq->is_watch)
2828 lreq->notify_id = 0;
2829 else
2830 WARN_ON(op->watch.op != CEPH_OSD_WATCH_OP_WATCH);
2831 dout("lreq %p register\n", lreq);
2832 req->r_callback = linger_commit_cb;
2833 }
2834 mutex_unlock(&lreq->lock);
2835
2836 req->r_priv = linger_get(lreq);
2837 req->r_linger = true;
2838
2839 submit_request(req, true);
2840 }
2841
2842 static void linger_ping_cb(struct ceph_osd_request *req)
2843 {
2844 struct ceph_osd_linger_request *lreq = req->r_priv;
2845
2846 mutex_lock(&lreq->lock);
2847 dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
2848 __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
2849 lreq->last_error);
2850 if (lreq->register_gen == req->r_ops[0].watch.gen) {
2851 if (!req->r_result) {
2852 lreq->watch_valid_thru = lreq->ping_sent;
2853 } else if (!lreq->last_error) {
2854 lreq->last_error = normalize_watch_error(req->r_result);
2855 queue_watch_error(lreq);
2856 }
2857 } else {
2858 dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
2859 lreq->register_gen, req->r_ops[0].watch.gen);
2860 }
2861
2862 mutex_unlock(&lreq->lock);
2863 linger_put(lreq);
2864 }
2865
2866 static void send_linger_ping(struct ceph_osd_linger_request *lreq)
2867 {
2868 struct ceph_osd_client *osdc = lreq->osdc;
2869 struct ceph_osd_request *req = lreq->ping_req;
2870 struct ceph_osd_req_op *op = &req->r_ops[0];
2871
2872 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2873 dout("%s PAUSERD\n", __func__);
2874 return;
2875 }
2876
2877 lreq->ping_sent = jiffies;
2878 dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
2879 __func__, lreq, lreq->linger_id, lreq->ping_sent,
2880 lreq->register_gen);
2881
2882 if (req->r_osd)
2883 cancel_linger_request(req);
2884
2885 request_reinit(req);
2886 target_copy(&req->r_t, &lreq->t);
2887
2888 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2889 op->watch.cookie != lreq->linger_id ||
2890 op->watch.op != CEPH_OSD_WATCH_OP_PING);
2891 op->watch.gen = lreq->register_gen;
2892 req->r_callback = linger_ping_cb;
2893 req->r_priv = linger_get(lreq);
2894 req->r_linger = true;
2895
2896 ceph_osdc_get_request(req);
2897 account_request(req);
2898 req->r_tid = atomic64_inc_return(&osdc->last_tid);
2899 link_request(lreq->osd, req);
2900 send_request(req);
2901 }
2902
2903 static void linger_submit(struct ceph_osd_linger_request *lreq)
2904 {
2905 struct ceph_osd_client *osdc = lreq->osdc;
2906 struct ceph_osd *osd;
2907
2908 calc_target(osdc, &lreq->t, NULL, false);
2909 osd = lookup_create_osd(osdc, lreq->t.osd, true);
2910 link_linger(osd, lreq);
2911
2912 send_linger(lreq);
2913 }
2914
2915 static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
2916 {
2917 struct ceph_osd_client *osdc = lreq->osdc;
2918 struct ceph_osd_linger_request *lookup_lreq;
2919
2920 verify_osdc_wrlocked(osdc);
2921
2922 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
2923 lreq->linger_id);
2924 if (!lookup_lreq)
2925 return;
2926
2927 WARN_ON(lookup_lreq != lreq);
2928 erase_linger_mc(&osdc->linger_map_checks, lreq);
2929 linger_put(lreq);
2930 }
2931
2932 /*
2933 * @lreq has to be both registered and linked.
2934 */
2935 static void __linger_cancel(struct ceph_osd_linger_request *lreq)
2936 {
2937 if (lreq->is_watch && lreq->ping_req->r_osd)
2938 cancel_linger_request(lreq->ping_req);
2939 if (lreq->reg_req->r_osd)
2940 cancel_linger_request(lreq->reg_req);
2941 cancel_linger_map_check(lreq);
2942 unlink_linger(lreq->osd, lreq);
2943 linger_unregister(lreq);
2944 }
2945
2946 static void linger_cancel(struct ceph_osd_linger_request *lreq)
2947 {
2948 struct ceph_osd_client *osdc = lreq->osdc;
2949
2950 down_write(&osdc->lock);
2951 if (__linger_registered(lreq))
2952 __linger_cancel(lreq);
2953 up_write(&osdc->lock);
2954 }
2955
2956 static void send_linger_map_check(struct ceph_osd_linger_request *lreq);
2957
2958 static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
2959 {
2960 struct ceph_osd_client *osdc = lreq->osdc;
2961 struct ceph_osdmap *map = osdc->osdmap;
2962
2963 verify_osdc_wrlocked(osdc);
2964 WARN_ON(!map->epoch);
2965
2966 if (lreq->register_gen) {
2967 lreq->map_dne_bound = map->epoch;
2968 dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
2969 lreq, lreq->linger_id);
2970 } else {
2971 dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
2972 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
2973 map->epoch);
2974 }
2975
2976 if (lreq->map_dne_bound) {
2977 if (map->epoch >= lreq->map_dne_bound) {
2978 /* we had a new enough map */
2979 pr_info("linger_id %llu pool does not exist\n",
2980 lreq->linger_id);
2981 linger_reg_commit_complete(lreq, -ENOENT);
2982 __linger_cancel(lreq);
2983 }
2984 } else {
2985 send_linger_map_check(lreq);
2986 }
2987 }
2988
2989 static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
2990 {
2991 struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2992 struct ceph_osd_linger_request *lreq;
2993 u64 linger_id = greq->private_data;
2994
2995 WARN_ON(greq->result || !greq->u.newest);
2996
2997 down_write(&osdc->lock);
2998 lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
2999 if (!lreq) {
3000 dout("%s linger_id %llu dne\n", __func__, linger_id);
3001 goto out_unlock;
3002 }
3003
3004 dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
3005 __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
3006 greq->u.newest);
3007 if (!lreq->map_dne_bound)
3008 lreq->map_dne_bound = greq->u.newest;
3009 erase_linger_mc(&osdc->linger_map_checks, lreq);
3010 check_linger_pool_dne(lreq);
3011
3012 linger_put(lreq);
3013 out_unlock:
3014 up_write(&osdc->lock);
3015 }
3016
3017 static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
3018 {
3019 struct ceph_osd_client *osdc = lreq->osdc;
3020 struct ceph_osd_linger_request *lookup_lreq;
3021 int ret;
3022
3023 verify_osdc_wrlocked(osdc);
3024
3025 lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
3026 lreq->linger_id);
3027 if (lookup_lreq) {
3028 WARN_ON(lookup_lreq != lreq);
3029 return;
3030 }
3031
3032 linger_get(lreq);
3033 insert_linger_mc(&osdc->linger_map_checks, lreq);
3034 ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
3035 linger_map_check_cb, lreq->linger_id);
3036 WARN_ON(ret);
3037 }
3038
3039 static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
3040 {
3041 int ret;
3042
3043 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3044 ret = wait_for_completion_interruptible(&lreq->reg_commit_wait);
3045 return ret ?: lreq->reg_commit_error;
3046 }
3047
3048 static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq)
3049 {
3050 int ret;
3051
3052 dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3053 ret = wait_for_completion_interruptible(&lreq->notify_finish_wait);
3054 return ret ?: lreq->notify_finish_error;
3055 }
3056
3057 /*
3058 * Timeout callback, called every N seconds. When 1 or more OSD
3059 * requests has been active for more than N seconds, we send a keepalive
3060 * (tag + timestamp) to its OSD to ensure any communications channel
3061 * reset is detected.
3062 */
3063 static void handle_timeout(struct work_struct *work)
3064 {
3065 struct ceph_osd_client *osdc =
3066 container_of(work, struct ceph_osd_client, timeout_work.work);
3067 struct ceph_options *opts = osdc->client->options;
3068 unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
3069 unsigned long expiry_cutoff = jiffies - opts->osd_request_timeout;
3070 LIST_HEAD(slow_osds);
3071 struct rb_node *n, *p;
3072
3073 dout("%s osdc %p\n", __func__, osdc);
3074 down_write(&osdc->lock);
3075
3076 /*
3077 * ping osds that are a bit slow. this ensures that if there
3078 * is a break in the TCP connection we will notice, and reopen
3079 * a connection with that osd (from the fault callback).
3080 */
3081 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
3082 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3083 bool found = false;
3084
3085 for (p = rb_first(&osd->o_requests); p; ) {
3086 struct ceph_osd_request *req =
3087 rb_entry(p, struct ceph_osd_request, r_node);
3088
3089 p = rb_next(p); /* abort_request() */
3090
3091 if (time_before(req->r_stamp, cutoff)) {
3092 dout(" req %p tid %llu on osd%d is laggy\n",
3093 req, req->r_tid, osd->o_osd);
3094 found = true;
3095 }
3096 if (opts->osd_request_timeout &&
3097 time_before(req->r_start_stamp, expiry_cutoff)) {
3098 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3099 req->r_tid, osd->o_osd);
3100 abort_request(req, -ETIMEDOUT);
3101 }
3102 }
3103 for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
3104 struct ceph_osd_linger_request *lreq =
3105 rb_entry(p, struct ceph_osd_linger_request, node);
3106
3107 dout(" lreq %p linger_id %llu is served by osd%d\n",
3108 lreq, lreq->linger_id, osd->o_osd);
3109 found = true;
3110
3111 mutex_lock(&lreq->lock);
3112 if (lreq->is_watch && lreq->committed && !lreq->last_error)
3113 send_linger_ping(lreq);
3114 mutex_unlock(&lreq->lock);
3115 }
3116
3117 if (found)
3118 list_move_tail(&osd->o_keepalive_item, &slow_osds);
3119 }
3120
3121 if (opts->osd_request_timeout) {
3122 for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
3123 struct ceph_osd_request *req =
3124 rb_entry(p, struct ceph_osd_request, r_node);
3125
3126 p = rb_next(p); /* abort_request() */
3127
3128 if (time_before(req->r_start_stamp, expiry_cutoff)) {
3129 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3130 req->r_tid, osdc->homeless_osd.o_osd);
3131 abort_request(req, -ETIMEDOUT);
3132 }
3133 }
3134 }
3135
3136 if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
3137 maybe_request_map(osdc);
3138
3139 while (!list_empty(&slow_osds)) {
3140 struct ceph_osd *osd = list_first_entry(&slow_osds,
3141 struct ceph_osd,
3142 o_keepalive_item);
3143 list_del_init(&osd->o_keepalive_item);
3144 ceph_con_keepalive(&osd->o_con);
3145 }
3146
3147 up_write(&osdc->lock);
3148 schedule_delayed_work(&osdc->timeout_work,
3149 osdc->client->options->osd_keepalive_timeout);
3150 }
3151
3152 static void handle_osds_timeout(struct work_struct *work)
3153 {
3154 struct ceph_osd_client *osdc =
3155 container_of(work, struct ceph_osd_client,
3156 osds_timeout_work.work);
3157 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
3158 struct ceph_osd *osd, *nosd;
3159
3160 dout("%s osdc %p\n", __func__, osdc);
3161 down_write(&osdc->lock);
3162 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
3163 if (time_before(jiffies, osd->lru_ttl))
3164 break;
3165
3166 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
3167 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
3168 close_osd(osd);
3169 }
3170
3171 up_write(&osdc->lock);
3172 schedule_delayed_work(&osdc->osds_timeout_work,
3173 round_jiffies_relative(delay));
3174 }
3175
3176 static int ceph_oloc_decode(void **p, void *end,
3177 struct ceph_object_locator *oloc)
3178 {
3179 u8 struct_v, struct_cv;
3180 u32 len;
3181 void *struct_end;
3182 int ret = 0;
3183
3184 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3185 struct_v = ceph_decode_8(p);
3186 struct_cv = ceph_decode_8(p);
3187 if (struct_v < 3) {
3188 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
3189 struct_v, struct_cv);
3190 goto e_inval;
3191 }
3192 if (struct_cv > 6) {
3193 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
3194 struct_v, struct_cv);
3195 goto e_inval;
3196 }
3197 len = ceph_decode_32(p);
3198 ceph_decode_need(p, end, len, e_inval);
3199 struct_end = *p + len;
3200
3201 oloc->pool = ceph_decode_64(p);
3202 *p += 4; /* skip preferred */
3203
3204 len = ceph_decode_32(p);
3205 if (len > 0) {
3206 pr_warn("ceph_object_locator::key is set\n");
3207 goto e_inval;
3208 }
3209
3210 if (struct_v >= 5) {
3211 bool changed = false;
3212
3213 len = ceph_decode_32(p);
3214 if (len > 0) {
3215 ceph_decode_need(p, end, len, e_inval);
3216 if (!oloc->pool_ns ||
3217 ceph_compare_string(oloc->pool_ns, *p, len))
3218 changed = true;
3219 *p += len;
3220 } else {
3221 if (oloc->pool_ns)
3222 changed = true;
3223 }
3224 if (changed) {
3225 /* redirect changes namespace */
3226 pr_warn("ceph_object_locator::nspace is changed\n");
3227 goto e_inval;
3228 }
3229 }
3230
3231 if (struct_v >= 6) {
3232 s64 hash = ceph_decode_64(p);
3233 if (hash != -1) {
3234 pr_warn("ceph_object_locator::hash is set\n");
3235 goto e_inval;
3236 }
3237 }
3238
3239 /* skip the rest */
3240 *p = struct_end;
3241 out:
3242 return ret;
3243
3244 e_inval:
3245 ret = -EINVAL;
3246 goto out;
3247 }
3248
3249 static int ceph_redirect_decode(void **p, void *end,
3250 struct ceph_request_redirect *redir)
3251 {
3252 u8 struct_v, struct_cv;
3253 u32 len;
3254 void *struct_end;
3255 int ret;
3256
3257 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3258 struct_v = ceph_decode_8(p);
3259 struct_cv = ceph_decode_8(p);
3260 if (struct_cv > 1) {
3261 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
3262 struct_v, struct_cv);
3263 goto e_inval;
3264 }
3265 len = ceph_decode_32(p);
3266 ceph_decode_need(p, end, len, e_inval);
3267 struct_end = *p + len;
3268
3269 ret = ceph_oloc_decode(p, end, &redir->oloc);
3270 if (ret)
3271 goto out;
3272
3273 len = ceph_decode_32(p);
3274 if (len > 0) {
3275 pr_warn("ceph_request_redirect::object_name is set\n");
3276 goto e_inval;
3277 }
3278
3279 len = ceph_decode_32(p);
3280 *p += len; /* skip osd_instructions */
3281
3282 /* skip the rest */
3283 *p = struct_end;
3284 out:
3285 return ret;
3286
3287 e_inval:
3288 ret = -EINVAL;
3289 goto out;
3290 }
3291
3292 struct MOSDOpReply {
3293 struct ceph_pg pgid;
3294 u64 flags;
3295 int result;
3296 u32 epoch;
3297 int num_ops;
3298 u32 outdata_len[CEPH_OSD_MAX_OPS];
3299 s32 rval[CEPH_OSD_MAX_OPS];
3300 int retry_attempt;
3301 struct ceph_eversion replay_version;
3302 u64 user_version;
3303 struct ceph_request_redirect redirect;
3304 };
3305
3306 static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
3307 {
3308 void *p = msg->front.iov_base;
3309 void *const end = p + msg->front.iov_len;
3310 u16 version = le16_to_cpu(msg->hdr.version);
3311 struct ceph_eversion bad_replay_version;
3312 u8 decode_redir;
3313 u32 len;
3314 int ret;
3315 int i;
3316
3317 ceph_decode_32_safe(&p, end, len, e_inval);
3318 ceph_decode_need(&p, end, len, e_inval);
3319 p += len; /* skip oid */
3320
3321 ret = ceph_decode_pgid(&p, end, &m->pgid);
3322 if (ret)
3323 return ret;
3324
3325 ceph_decode_64_safe(&p, end, m->flags, e_inval);
3326 ceph_decode_32_safe(&p, end, m->result, e_inval);
3327 ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
3328 memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
3329 p += sizeof(bad_replay_version);
3330 ceph_decode_32_safe(&p, end, m->epoch, e_inval);
3331
3332 ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
3333 if (m->num_ops > ARRAY_SIZE(m->outdata_len))
3334 goto e_inval;
3335
3336 ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
3337 e_inval);
3338 for (i = 0; i < m->num_ops; i++) {
3339 struct ceph_osd_op *op = p;
3340
3341 m->outdata_len[i] = le32_to_cpu(op->payload_len);
3342 p += sizeof(*op);
3343 }
3344
3345 ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
3346 for (i = 0; i < m->num_ops; i++)
3347 ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
3348
3349 if (version >= 5) {
3350 ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
3351 memcpy(&m->replay_version, p, sizeof(m->replay_version));
3352 p += sizeof(m->replay_version);
3353 ceph_decode_64_safe(&p, end, m->user_version, e_inval);
3354 } else {
3355 m->replay_version = bad_replay_version; /* struct */
3356 m->user_version = le64_to_cpu(m->replay_version.version);
3357 }
3358
3359 if (version >= 6) {
3360 if (version >= 7)
3361 ceph_decode_8_safe(&p, end, decode_redir, e_inval);
3362 else
3363 decode_redir = 1;
3364 } else {
3365 decode_redir = 0;
3366 }
3367
3368 if (decode_redir) {
3369 ret = ceph_redirect_decode(&p, end, &m->redirect);
3370 if (ret)
3371 return ret;
3372 } else {
3373 ceph_oloc_init(&m->redirect.oloc);
3374 }
3375
3376 return 0;
3377
3378 e_inval:
3379 return -EINVAL;
3380 }
3381
3382 /*
3383 * Handle MOSDOpReply. Set ->r_result and call the callback if it is
3384 * specified.
3385 */
3386 static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
3387 {
3388 struct ceph_osd_client *osdc = osd->o_osdc;
3389 struct ceph_osd_request *req;
3390 struct MOSDOpReply m;
3391 u64 tid = le64_to_cpu(msg->hdr.tid);
3392 u32 data_len = 0;
3393 int ret;
3394 int i;
3395
3396 dout("%s msg %p tid %llu\n", __func__, msg, tid);
3397
3398 down_read(&osdc->lock);
3399 if (!osd_registered(osd)) {
3400 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3401 goto out_unlock_osdc;
3402 }
3403 WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
3404
3405 mutex_lock(&osd->lock);
3406 req = lookup_request(&osd->o_requests, tid);
3407 if (!req) {
3408 dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
3409 goto out_unlock_session;
3410 }
3411
3412 m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
3413 ret = decode_MOSDOpReply(msg, &m);
3414 m.redirect.oloc.pool_ns = NULL;
3415 if (ret) {
3416 pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
3417 req->r_tid, ret);
3418 ceph_msg_dump(msg);
3419 goto fail_request;
3420 }
3421 dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
3422 __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
3423 m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
3424 le64_to_cpu(m.replay_version.version), m.user_version);
3425
3426 if (m.retry_attempt >= 0) {
3427 if (m.retry_attempt != req->r_attempts - 1) {
3428 dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
3429 req, req->r_tid, m.retry_attempt,
3430 req->r_attempts - 1);
3431 goto out_unlock_session;
3432 }
3433 } else {
3434 WARN_ON(1); /* MOSDOpReply v4 is assumed */
3435 }
3436
3437 if (!ceph_oloc_empty(&m.redirect.oloc)) {
3438 dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
3439 m.redirect.oloc.pool);
3440 unlink_request(osd, req);
3441 mutex_unlock(&osd->lock);
3442
3443 /*
3444 * Not ceph_oloc_copy() - changing pool_ns is not
3445 * supported.
3446 */
3447 req->r_t.target_oloc.pool = m.redirect.oloc.pool;
3448 req->r_flags |= CEPH_OSD_FLAG_REDIRECTED;
3449 req->r_tid = 0;
3450 __submit_request(req, false);
3451 goto out_unlock_osdc;
3452 }
3453
3454 if (m.num_ops != req->r_num_ops) {
3455 pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
3456 req->r_num_ops, req->r_tid);
3457 goto fail_request;
3458 }
3459 for (i = 0; i < req->r_num_ops; i++) {
3460 dout(" req %p tid %llu op %d rval %d len %u\n", req,
3461 req->r_tid, i, m.rval[i], m.outdata_len[i]);
3462 req->r_ops[i].rval = m.rval[i];
3463 req->r_ops[i].outdata_len = m.outdata_len[i];
3464 data_len += m.outdata_len[i];
3465 }
3466 if (data_len != le32_to_cpu(msg->hdr.data_len)) {
3467 pr_err("sum of lens %u != %u for tid %llu\n", data_len,
3468 le32_to_cpu(msg->hdr.data_len), req->r_tid);
3469 goto fail_request;
3470 }
3471 dout("%s req %p tid %llu result %d data_len %u\n", __func__,
3472 req, req->r_tid, m.result, data_len);
3473
3474 /*
3475 * Since we only ever request ONDISK, we should only ever get
3476 * one (type of) reply back.
3477 */
3478 WARN_ON(!(m.flags & CEPH_OSD_FLAG_ONDISK));
3479 req->r_result = m.result ?: data_len;
3480 finish_request(req);
3481 mutex_unlock(&osd->lock);
3482 up_read(&osdc->lock);
3483
3484 __complete_request(req);
3485 complete_all(&req->r_completion);
3486 ceph_osdc_put_request(req);
3487 return;
3488
3489 fail_request:
3490 complete_request(req, -EIO);
3491 out_unlock_session:
3492 mutex_unlock(&osd->lock);
3493 out_unlock_osdc:
3494 up_read(&osdc->lock);
3495 }
3496
3497 static void set_pool_was_full(struct ceph_osd_client *osdc)
3498 {
3499 struct rb_node *n;
3500
3501 for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
3502 struct ceph_pg_pool_info *pi =
3503 rb_entry(n, struct ceph_pg_pool_info, node);
3504
3505 pi->was_full = __pool_full(pi);
3506 }
3507 }
3508
3509 static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
3510 {
3511 struct ceph_pg_pool_info *pi;
3512
3513 pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
3514 if (!pi)
3515 return false;
3516
3517 return pi->was_full && !__pool_full(pi);
3518 }
3519
3520 static enum calc_target_result
3521 recalc_linger_target(struct ceph_osd_linger_request *lreq)
3522 {
3523 struct ceph_osd_client *osdc = lreq->osdc;
3524 enum calc_target_result ct_res;
3525
3526 ct_res = calc_target(osdc, &lreq->t, NULL, true);
3527 if (ct_res == CALC_TARGET_NEED_RESEND) {
3528 struct ceph_osd *osd;
3529
3530 osd = lookup_create_osd(osdc, lreq->t.osd, true);
3531 if (osd != lreq->osd) {
3532 unlink_linger(lreq->osd, lreq);
3533 link_linger(osd, lreq);
3534 }
3535 }
3536
3537 return ct_res;
3538 }
3539
3540 /*
3541 * Requeue requests whose mapping to an OSD has changed.
3542 */
3543 static void scan_requests(struct ceph_osd *osd,
3544 bool force_resend,
3545 bool cleared_full,
3546 bool check_pool_cleared_full,
3547 struct rb_root *need_resend,
3548 struct list_head *need_resend_linger)
3549 {
3550 struct ceph_osd_client *osdc = osd->o_osdc;
3551 struct rb_node *n;
3552 bool force_resend_writes;
3553
3554 for (n = rb_first(&osd->o_linger_requests); n; ) {
3555 struct ceph_osd_linger_request *lreq =
3556 rb_entry(n, struct ceph_osd_linger_request, node);
3557 enum calc_target_result ct_res;
3558
3559 n = rb_next(n); /* recalc_linger_target() */
3560
3561 dout("%s lreq %p linger_id %llu\n", __func__, lreq,
3562 lreq->linger_id);
3563 ct_res = recalc_linger_target(lreq);
3564 switch (ct_res) {
3565 case CALC_TARGET_NO_ACTION:
3566 force_resend_writes = cleared_full ||
3567 (check_pool_cleared_full &&
3568 pool_cleared_full(osdc, lreq->t.base_oloc.pool));
3569 if (!force_resend && !force_resend_writes)
3570 break;
3571
3572 /* fall through */
3573 case CALC_TARGET_NEED_RESEND:
3574 cancel_linger_map_check(lreq);
3575 /*
3576 * scan_requests() for the previous epoch(s)
3577 * may have already added it to the list, since
3578 * it's not unlinked here.
3579 */
3580 if (list_empty(&lreq->scan_item))
3581 list_add_tail(&lreq->scan_item, need_resend_linger);
3582 break;
3583 case CALC_TARGET_POOL_DNE:
3584 list_del_init(&lreq->scan_item);
3585 check_linger_pool_dne(lreq);
3586 break;
3587 }
3588 }
3589
3590 for (n = rb_first(&osd->o_requests); n; ) {
3591 struct ceph_osd_request *req =
3592 rb_entry(n, struct ceph_osd_request, r_node);
3593 enum calc_target_result ct_res;
3594
3595 n = rb_next(n); /* unlink_request(), check_pool_dne() */
3596
3597 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3598 ct_res = calc_target(osdc, &req->r_t, &req->r_osd->o_con,
3599 false);
3600 switch (ct_res) {
3601 case CALC_TARGET_NO_ACTION:
3602 force_resend_writes = cleared_full ||
3603 (check_pool_cleared_full &&
3604 pool_cleared_full(osdc, req->r_t.base_oloc.pool));
3605 if (!force_resend &&
3606 (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
3607 !force_resend_writes))
3608 break;
3609
3610 /* fall through */
3611 case CALC_TARGET_NEED_RESEND:
3612 cancel_map_check(req);
3613 unlink_request(osd, req);
3614 insert_request(need_resend, req);
3615 break;
3616 case CALC_TARGET_POOL_DNE:
3617 check_pool_dne(req);
3618 break;
3619 }
3620 }
3621 }
3622
3623 static int handle_one_map(struct ceph_osd_client *osdc,
3624 void *p, void *end, bool incremental,
3625 struct rb_root *need_resend,
3626 struct list_head *need_resend_linger)
3627 {
3628 struct ceph_osdmap *newmap;
3629 struct rb_node *n;
3630 bool skipped_map = false;
3631 bool was_full;
3632
3633 was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3634 set_pool_was_full(osdc);
3635
3636 if (incremental)
3637 newmap = osdmap_apply_incremental(&p, end, osdc->osdmap);
3638 else
3639 newmap = ceph_osdmap_decode(&p, end);
3640 if (IS_ERR(newmap))
3641 return PTR_ERR(newmap);
3642
3643 if (newmap != osdc->osdmap) {
3644 /*
3645 * Preserve ->was_full before destroying the old map.
3646 * For pools that weren't in the old map, ->was_full
3647 * should be false.
3648 */
3649 for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
3650 struct ceph_pg_pool_info *pi =
3651 rb_entry(n, struct ceph_pg_pool_info, node);
3652 struct ceph_pg_pool_info *old_pi;
3653
3654 old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
3655 if (old_pi)
3656 pi->was_full = old_pi->was_full;
3657 else
3658 WARN_ON(pi->was_full);
3659 }
3660
3661 if (osdc->osdmap->epoch &&
3662 osdc->osdmap->epoch + 1 < newmap->epoch) {
3663 WARN_ON(incremental);
3664 skipped_map = true;
3665 }
3666
3667 ceph_osdmap_destroy(osdc->osdmap);
3668 osdc->osdmap = newmap;
3669 }
3670
3671 was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3672 scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
3673 need_resend, need_resend_linger);
3674
3675 for (n = rb_first(&osdc->osds); n; ) {
3676 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3677
3678 n = rb_next(n); /* close_osd() */
3679
3680 scan_requests(osd, skipped_map, was_full, true, need_resend,
3681 need_resend_linger);
3682 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
3683 memcmp(&osd->o_con.peer_addr,
3684 ceph_osd_addr(osdc->osdmap, osd->o_osd),
3685 sizeof(struct ceph_entity_addr)))
3686 close_osd(osd);
3687 }
3688
3689 return 0;
3690 }
3691
3692 static void kick_requests(struct ceph_osd_client *osdc,
3693 struct rb_root *need_resend,
3694 struct list_head *need_resend_linger)
3695 {
3696 struct ceph_osd_linger_request *lreq, *nlreq;
3697 enum calc_target_result ct_res;
3698 struct rb_node *n;
3699
3700 /* make sure need_resend targets reflect latest map */
3701 for (n = rb_first(need_resend); n; ) {
3702 struct ceph_osd_request *req =
3703 rb_entry(n, struct ceph_osd_request, r_node);
3704
3705 n = rb_next(n);
3706
3707 if (req->r_t.epoch < osdc->osdmap->epoch) {
3708 ct_res = calc_target(osdc, &req->r_t, NULL, false);
3709 if (ct_res == CALC_TARGET_POOL_DNE) {
3710 erase_request(need_resend, req);
3711 check_pool_dne(req);
3712 }
3713 }
3714 }
3715
3716 for (n = rb_first(need_resend); n; ) {
3717 struct ceph_osd_request *req =
3718 rb_entry(n, struct ceph_osd_request, r_node);
3719 struct ceph_osd *osd;
3720
3721 n = rb_next(n);
3722 erase_request(need_resend, req); /* before link_request() */
3723
3724 osd = lookup_create_osd(osdc, req->r_t.osd, true);
3725 link_request(osd, req);
3726 if (!req->r_linger) {
3727 if (!osd_homeless(osd) && !req->r_t.paused)
3728 send_request(req);
3729 } else {
3730 cancel_linger_request(req);
3731 }
3732 }
3733
3734 list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
3735 if (!osd_homeless(lreq->osd))
3736 send_linger(lreq);
3737
3738 list_del_init(&lreq->scan_item);
3739 }
3740 }
3741
3742 /*
3743 * Process updated osd map.
3744 *
3745 * The message contains any number of incremental and full maps, normally
3746 * indicating some sort of topology change in the cluster. Kick requests
3747 * off to different OSDs as needed.
3748 */
3749 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
3750 {
3751 void *p = msg->front.iov_base;
3752 void *const end = p + msg->front.iov_len;
3753 u32 nr_maps, maplen;
3754 u32 epoch;
3755 struct ceph_fsid fsid;
3756 struct rb_root need_resend = RB_ROOT;
3757 LIST_HEAD(need_resend_linger);
3758 bool handled_incremental = false;
3759 bool was_pauserd, was_pausewr;
3760 bool pauserd, pausewr;
3761 int err;
3762
3763 dout("%s have %u\n", __func__, osdc->osdmap->epoch);
3764 down_write(&osdc->lock);
3765
3766 /* verify fsid */
3767 ceph_decode_need(&p, end, sizeof(fsid), bad);
3768 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3769 if (ceph_check_fsid(osdc->client, &fsid) < 0)
3770 goto bad;
3771
3772 was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3773 was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3774 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3775 have_pool_full(osdc);
3776
3777 /* incremental maps */
3778 ceph_decode_32_safe(&p, end, nr_maps, bad);
3779 dout(" %d inc maps\n", nr_maps);
3780 while (nr_maps > 0) {
3781 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3782 epoch = ceph_decode_32(&p);
3783 maplen = ceph_decode_32(&p);
3784 ceph_decode_need(&p, end, maplen, bad);
3785 if (osdc->osdmap->epoch &&
3786 osdc->osdmap->epoch + 1 == epoch) {
3787 dout("applying incremental map %u len %d\n",
3788 epoch, maplen);
3789 err = handle_one_map(osdc, p, p + maplen, true,
3790 &need_resend, &need_resend_linger);
3791 if (err)
3792 goto bad;
3793 handled_incremental = true;
3794 } else {
3795 dout("ignoring incremental map %u len %d\n",
3796 epoch, maplen);
3797 }
3798 p += maplen;
3799 nr_maps--;
3800 }
3801 if (handled_incremental)
3802 goto done;
3803
3804 /* full maps */
3805 ceph_decode_32_safe(&p, end, nr_maps, bad);
3806 dout(" %d full maps\n", nr_maps);
3807 while (nr_maps) {
3808 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3809 epoch = ceph_decode_32(&p);
3810 maplen = ceph_decode_32(&p);
3811 ceph_decode_need(&p, end, maplen, bad);
3812 if (nr_maps > 1) {
3813 dout("skipping non-latest full map %u len %d\n",
3814 epoch, maplen);
3815 } else if (osdc->osdmap->epoch >= epoch) {
3816 dout("skipping full map %u len %d, "
3817 "older than our %u\n", epoch, maplen,
3818 osdc->osdmap->epoch);
3819 } else {
3820 dout("taking full map %u len %d\n", epoch, maplen);
3821 err = handle_one_map(osdc, p, p + maplen, false,
3822 &need_resend, &need_resend_linger);
3823 if (err)
3824 goto bad;
3825 }
3826 p += maplen;
3827 nr_maps--;
3828 }
3829
3830 done:
3831 /*
3832 * subscribe to subsequent osdmap updates if full to ensure
3833 * we find out when we are no longer full and stop returning
3834 * ENOSPC.
3835 */
3836 pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3837 pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3838 ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3839 have_pool_full(osdc);
3840 if (was_pauserd || was_pausewr || pauserd || pausewr ||
3841 osdc->osdmap->epoch < osdc->epoch_barrier)
3842 maybe_request_map(osdc);
3843
3844 kick_requests(osdc, &need_resend, &need_resend_linger);
3845
3846 ceph_osdc_abort_on_full(osdc);
3847 ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
3848 osdc->osdmap->epoch);
3849 up_write(&osdc->lock);
3850 wake_up_all(&osdc->client->auth_wq);
3851 return;
3852
3853 bad:
3854 pr_err("osdc handle_map corrupt msg\n");
3855 ceph_msg_dump(msg);
3856 up_write(&osdc->lock);
3857 }
3858
3859 /*
3860 * Resubmit requests pending on the given osd.
3861 */
3862 static void kick_osd_requests(struct ceph_osd *osd)
3863 {
3864 struct rb_node *n;
3865
3866 clear_backoffs(osd);
3867
3868 for (n = rb_first(&osd->o_requests); n; ) {
3869 struct ceph_osd_request *req =
3870 rb_entry(n, struct ceph_osd_request, r_node);
3871
3872 n = rb_next(n); /* cancel_linger_request() */
3873
3874 if (!req->r_linger) {
3875 if (!req->r_t.paused)
3876 send_request(req);
3877 } else {
3878 cancel_linger_request(req);
3879 }
3880 }
3881 for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
3882 struct ceph_osd_linger_request *lreq =
3883 rb_entry(n, struct ceph_osd_linger_request, node);
3884
3885 send_linger(lreq);
3886 }
3887 }
3888
3889 /*
3890 * If the osd connection drops, we need to resubmit all requests.
3891 */
3892 static void osd_fault(struct ceph_connection *con)
3893 {
3894 struct ceph_osd *osd = con->private;
3895 struct ceph_osd_client *osdc = osd->o_osdc;
3896
3897 dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
3898
3899 down_write(&osdc->lock);
3900 if (!osd_registered(osd)) {
3901 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3902 goto out_unlock;
3903 }
3904
3905 if (!reopen_osd(osd))
3906 kick_osd_requests(osd);
3907 maybe_request_map(osdc);
3908
3909 out_unlock:
3910 up_write(&osdc->lock);
3911 }
3912
3913 struct MOSDBackoff {
3914 struct ceph_spg spgid;
3915 u32 map_epoch;
3916 u8 op;
3917 u64 id;
3918 struct ceph_hobject_id *begin;
3919 struct ceph_hobject_id *end;
3920 };
3921
3922 static int decode_MOSDBackoff(const struct ceph_msg *msg, struct MOSDBackoff *m)
3923 {
3924 void *p = msg->front.iov_base;
3925 void *const end = p + msg->front.iov_len;
3926 u8 struct_v;
3927 u32 struct_len;
3928 int ret;
3929
3930 ret = ceph_start_decoding(&p, end, 1, "spg_t", &struct_v, &struct_len);
3931 if (ret)
3932 return ret;
3933
3934 ret = ceph_decode_pgid(&p, end, &m->spgid.pgid);
3935 if (ret)
3936 return ret;
3937
3938 ceph_decode_8_safe(&p, end, m->spgid.shard, e_inval);
3939 ceph_decode_32_safe(&p, end, m->map_epoch, e_inval);
3940 ceph_decode_8_safe(&p, end, m->op, e_inval);
3941 ceph_decode_64_safe(&p, end, m->id, e_inval);
3942
3943 m->begin = kzalloc(sizeof(*m->begin), GFP_NOIO);
3944 if (!m->begin)
3945 return -ENOMEM;
3946
3947 ret = decode_hoid(&p, end, m->begin);
3948 if (ret) {
3949 free_hoid(m->begin);
3950 return ret;
3951 }
3952
3953 m->end = kzalloc(sizeof(*m->end), GFP_NOIO);
3954 if (!m->end) {
3955 free_hoid(m->begin);
3956 return -ENOMEM;
3957 }
3958
3959 ret = decode_hoid(&p, end, m->end);
3960 if (ret) {
3961 free_hoid(m->begin);
3962 free_hoid(m->end);
3963 return ret;
3964 }
3965
3966 return 0;
3967
3968 e_inval:
3969 return -EINVAL;
3970 }
3971
3972 static struct ceph_msg *create_backoff_message(
3973 const struct ceph_osd_backoff *backoff,
3974 u32 map_epoch)
3975 {
3976 struct ceph_msg *msg;
3977 void *p, *end;
3978 int msg_size;
3979
3980 msg_size = CEPH_ENCODING_START_BLK_LEN +
3981 CEPH_PGID_ENCODING_LEN + 1; /* spgid */
3982 msg_size += 4 + 1 + 8; /* map_epoch, op, id */
3983 msg_size += CEPH_ENCODING_START_BLK_LEN +
3984 hoid_encoding_size(backoff->begin);
3985 msg_size += CEPH_ENCODING_START_BLK_LEN +
3986 hoid_encoding_size(backoff->end);
3987
3988 msg = ceph_msg_new(CEPH_MSG_OSD_BACKOFF, msg_size, GFP_NOIO, true);
3989 if (!msg)
3990 return NULL;
3991
3992 p = msg->front.iov_base;
3993 end = p + msg->front_alloc_len;
3994
3995 encode_spgid(&p, &backoff->spgid);
3996 ceph_encode_32(&p, map_epoch);
3997 ceph_encode_8(&p, CEPH_OSD_BACKOFF_OP_ACK_BLOCK);
3998 ceph_encode_64(&p, backoff->id);
3999 encode_hoid(&p, end, backoff->begin);
4000 encode_hoid(&p, end, backoff->end);
4001 BUG_ON(p != end);
4002
4003 msg->front.iov_len = p - msg->front.iov_base;
4004 msg->hdr.version = cpu_to_le16(1); /* MOSDBackoff v1 */
4005 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
4006
4007 return msg;
4008 }
4009
4010 static void handle_backoff_block(struct ceph_osd *osd, struct MOSDBackoff *m)
4011 {
4012 struct ceph_spg_mapping *spg;
4013 struct ceph_osd_backoff *backoff;
4014 struct ceph_msg *msg;
4015
4016 dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4017 m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4018
4019 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &m->spgid);
4020 if (!spg) {
4021 spg = alloc_spg_mapping();
4022 if (!spg) {
4023 pr_err("%s failed to allocate spg\n", __func__);
4024 return;
4025 }
4026 spg->spgid = m->spgid; /* struct */
4027 insert_spg_mapping(&osd->o_backoff_mappings, spg);
4028 }
4029
4030 backoff = alloc_backoff();
4031 if (!backoff) {
4032 pr_err("%s failed to allocate backoff\n", __func__);
4033 return;
4034 }
4035 backoff->spgid = m->spgid; /* struct */
4036 backoff->id = m->id;
4037 backoff->begin = m->begin;
4038 m->begin = NULL; /* backoff now owns this */
4039 backoff->end = m->end;
4040 m->end = NULL; /* ditto */
4041
4042 insert_backoff(&spg->backoffs, backoff);
4043 insert_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4044
4045 /*
4046 * Ack with original backoff's epoch so that the OSD can
4047 * discard this if there was a PG split.
4048 */
4049 msg = create_backoff_message(backoff, m->map_epoch);
4050 if (!msg) {
4051 pr_err("%s failed to allocate msg\n", __func__);
4052 return;
4053 }
4054 ceph_con_send(&osd->o_con, msg);
4055 }
4056
4057 static bool target_contained_by(const struct ceph_osd_request_target *t,
4058 const struct ceph_hobject_id *begin,
4059 const struct ceph_hobject_id *end)
4060 {
4061 struct ceph_hobject_id hoid;
4062 int cmp;
4063
4064 hoid_fill_from_target(&hoid, t);
4065 cmp = hoid_compare(&hoid, begin);
4066 return !cmp || (cmp > 0 && hoid_compare(&hoid, end) < 0);
4067 }
4068
4069 static void handle_backoff_unblock(struct ceph_osd *osd,
4070 const struct MOSDBackoff *m)
4071 {
4072 struct ceph_spg_mapping *spg;
4073 struct ceph_osd_backoff *backoff;
4074 struct rb_node *n;
4075
4076 dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4077 m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4078
4079 backoff = lookup_backoff_by_id(&osd->o_backoffs_by_id, m->id);
4080 if (!backoff) {
4081 pr_err("%s osd%d spgid %llu.%xs%d id %llu backoff dne\n",
4082 __func__, osd->o_osd, m->spgid.pgid.pool,
4083 m->spgid.pgid.seed, m->spgid.shard, m->id);
4084 return;
4085 }
4086
4087 if (hoid_compare(backoff->begin, m->begin) &&
4088 hoid_compare(backoff->end, m->end)) {
4089 pr_err("%s osd%d spgid %llu.%xs%d id %llu bad range?\n",
4090 __func__, osd->o_osd, m->spgid.pgid.pool,
4091 m->spgid.pgid.seed, m->spgid.shard, m->id);
4092 /* unblock it anyway... */
4093 }
4094
4095 spg = lookup_spg_mapping(&osd->o_backoff_mappings, &backoff->spgid);
4096 BUG_ON(!spg);
4097
4098 erase_backoff(&spg->backoffs, backoff);
4099 erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4100 free_backoff(backoff);
4101
4102 if (RB_EMPTY_ROOT(&spg->backoffs)) {
4103 erase_spg_mapping(&osd->o_backoff_mappings, spg);
4104 free_spg_mapping(spg);
4105 }
4106
4107 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
4108 struct ceph_osd_request *req =
4109 rb_entry(n, struct ceph_osd_request, r_node);
4110
4111 if (!ceph_spg_compare(&req->r_t.spgid, &m->spgid)) {
4112 /*
4113 * Match against @m, not @backoff -- the PG may
4114 * have split on the OSD.
4115 */
4116 if (target_contained_by(&req->r_t, m->begin, m->end)) {
4117 /*
4118 * If no other installed backoff applies,
4119 * resend.
4120 */
4121 send_request(req);
4122 }
4123 }
4124 }
4125 }
4126
4127 static void handle_backoff(struct ceph_osd *osd, struct ceph_msg *msg)
4128 {
4129 struct ceph_osd_client *osdc = osd->o_osdc;
4130 struct MOSDBackoff m;
4131 int ret;
4132
4133 down_read(&osdc->lock);
4134 if (!osd_registered(osd)) {
4135 dout("%s osd%d unknown\n", __func__, osd->o_osd);
4136 up_read(&osdc->lock);
4137 return;
4138 }
4139 WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
4140
4141 mutex_lock(&osd->lock);
4142 ret = decode_MOSDBackoff(msg, &m);
4143 if (ret) {
4144 pr_err("failed to decode MOSDBackoff: %d\n", ret);
4145 ceph_msg_dump(msg);
4146 goto out_unlock;
4147 }
4148
4149 switch (m.op) {
4150 case CEPH_OSD_BACKOFF_OP_BLOCK:
4151 handle_backoff_block(osd, &m);
4152 break;
4153 case CEPH_OSD_BACKOFF_OP_UNBLOCK:
4154 handle_backoff_unblock(osd, &m);
4155 break;
4156 default:
4157 pr_err("%s osd%d unknown op %d\n", __func__, osd->o_osd, m.op);
4158 }
4159
4160 free_hoid(m.begin);
4161 free_hoid(m.end);
4162
4163 out_unlock:
4164 mutex_unlock(&osd->lock);
4165 up_read(&osdc->lock);
4166 }
4167
4168 /*
4169 * Process osd watch notifications
4170 */
4171 static void handle_watch_notify(struct ceph_osd_client *osdc,
4172 struct ceph_msg *msg)
4173 {
4174 void *p = msg->front.iov_base;
4175 void *const end = p + msg->front.iov_len;
4176 struct ceph_osd_linger_request *lreq;
4177 struct linger_work *lwork;
4178 u8 proto_ver, opcode;
4179 u64 cookie, notify_id;
4180 u64 notifier_id = 0;
4181 s32 return_code = 0;
4182 void *payload = NULL;
4183 u32 payload_len = 0;
4184
4185 ceph_decode_8_safe(&p, end, proto_ver, bad);
4186 ceph_decode_8_safe(&p, end, opcode, bad);
4187 ceph_decode_64_safe(&p, end, cookie, bad);
4188 p += 8; /* skip ver */
4189 ceph_decode_64_safe(&p, end, notify_id, bad);
4190
4191 if (proto_ver >= 1) {
4192 ceph_decode_32_safe(&p, end, payload_len, bad);
4193 ceph_decode_need(&p, end, payload_len, bad);
4194 payload = p;
4195 p += payload_len;
4196 }
4197
4198 if (le16_to_cpu(msg->hdr.version) >= 2)
4199 ceph_decode_32_safe(&p, end, return_code, bad);
4200
4201 if (le16_to_cpu(msg->hdr.version) >= 3)
4202 ceph_decode_64_safe(&p, end, notifier_id, bad);
4203
4204 down_read(&osdc->lock);
4205 lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
4206 if (!lreq) {
4207 dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
4208 cookie);
4209 goto out_unlock_osdc;
4210 }
4211
4212 mutex_lock(&lreq->lock);
4213 dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
4214 opcode, cookie, lreq, lreq->is_watch);
4215 if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
4216 if (!lreq->last_error) {
4217 lreq->last_error = -ENOTCONN;
4218 queue_watch_error(lreq);
4219 }
4220 } else if (!lreq->is_watch) {
4221 /* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
4222 if (lreq->notify_id && lreq->notify_id != notify_id) {
4223 dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
4224 lreq->notify_id, notify_id);
4225 } else if (!completion_done(&lreq->notify_finish_wait)) {
4226 struct ceph_msg_data *data =
4227 list_first_entry_or_null(&msg->data,
4228 struct ceph_msg_data,
4229 links);
4230
4231 if (data) {
4232 if (lreq->preply_pages) {
4233 WARN_ON(data->type !=
4234 CEPH_MSG_DATA_PAGES);
4235 *lreq->preply_pages = data->pages;
4236 *lreq->preply_len = data->length;
4237 } else {
4238 ceph_release_page_vector(data->pages,
4239 calc_pages_for(0, data->length));
4240 }
4241 }
4242 lreq->notify_finish_error = return_code;
4243 complete_all(&lreq->notify_finish_wait);
4244 }
4245 } else {
4246 /* CEPH_WATCH_EVENT_NOTIFY */
4247 lwork = lwork_alloc(lreq, do_watch_notify);
4248 if (!lwork) {
4249 pr_err("failed to allocate notify-lwork\n");
4250 goto out_unlock_lreq;
4251 }
4252
4253 lwork->notify.notify_id = notify_id;
4254 lwork->notify.notifier_id = notifier_id;
4255 lwork->notify.payload = payload;
4256 lwork->notify.payload_len = payload_len;
4257 lwork->notify.msg = ceph_msg_get(msg);
4258 lwork_queue(lwork);
4259 }
4260
4261 out_unlock_lreq:
4262 mutex_unlock(&lreq->lock);
4263 out_unlock_osdc:
4264 up_read(&osdc->lock);
4265 return;
4266
4267 bad:
4268 pr_err("osdc handle_watch_notify corrupt msg\n");
4269 }
4270
4271 /*
4272 * Register request, send initial attempt.
4273 */
4274 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
4275 struct ceph_osd_request *req,
4276 bool nofail)
4277 {
4278 down_read(&osdc->lock);
4279 submit_request(req, false);
4280 up_read(&osdc->lock);
4281
4282 return 0;
4283 }
4284 EXPORT_SYMBOL(ceph_osdc_start_request);
4285
4286 /*
4287 * Unregister a registered request. The request is not completed:
4288 * ->r_result isn't set and __complete_request() isn't called.
4289 */
4290 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
4291 {
4292 struct ceph_osd_client *osdc = req->r_osdc;
4293
4294 down_write(&osdc->lock);
4295 if (req->r_osd)
4296 cancel_request(req);
4297 up_write(&osdc->lock);
4298 }
4299 EXPORT_SYMBOL(ceph_osdc_cancel_request);
4300
4301 /*
4302 * @timeout: in jiffies, 0 means "wait forever"
4303 */
4304 static int wait_request_timeout(struct ceph_osd_request *req,
4305 unsigned long timeout)
4306 {
4307 long left;
4308
4309 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
4310 left = wait_for_completion_killable_timeout(&req->r_completion,
4311 ceph_timeout_jiffies(timeout));
4312 if (left <= 0) {
4313 left = left ?: -ETIMEDOUT;
4314 ceph_osdc_cancel_request(req);
4315 } else {
4316 left = req->r_result; /* completed */
4317 }
4318
4319 return left;
4320 }
4321
4322 /*
4323 * wait for a request to complete
4324 */
4325 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
4326 struct ceph_osd_request *req)
4327 {
4328 return wait_request_timeout(req, 0);
4329 }
4330 EXPORT_SYMBOL(ceph_osdc_wait_request);
4331
4332 /*
4333 * sync - wait for all in-flight requests to flush. avoid starvation.
4334 */
4335 void ceph_osdc_sync(struct ceph_osd_client *osdc)
4336 {
4337 struct rb_node *n, *p;
4338 u64 last_tid = atomic64_read(&osdc->last_tid);
4339
4340 again:
4341 down_read(&osdc->lock);
4342 for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
4343 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
4344
4345 mutex_lock(&osd->lock);
4346 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
4347 struct ceph_osd_request *req =
4348 rb_entry(p, struct ceph_osd_request, r_node);
4349
4350 if (req->r_tid > last_tid)
4351 break;
4352
4353 if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
4354 continue;
4355
4356 ceph_osdc_get_request(req);
4357 mutex_unlock(&osd->lock);
4358 up_read(&osdc->lock);
4359 dout("%s waiting on req %p tid %llu last_tid %llu\n",
4360 __func__, req, req->r_tid, last_tid);
4361 wait_for_completion(&req->r_completion);
4362 ceph_osdc_put_request(req);
4363 goto again;
4364 }
4365
4366 mutex_unlock(&osd->lock);
4367 }
4368
4369 up_read(&osdc->lock);
4370 dout("%s done last_tid %llu\n", __func__, last_tid);
4371 }
4372 EXPORT_SYMBOL(ceph_osdc_sync);
4373
4374 static struct ceph_osd_request *
4375 alloc_linger_request(struct ceph_osd_linger_request *lreq)
4376 {
4377 struct ceph_osd_request *req;
4378
4379 req = ceph_osdc_alloc_request(lreq->osdc, NULL, 1, false, GFP_NOIO);
4380 if (!req)
4381 return NULL;
4382
4383 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4384 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4385
4386 if (ceph_osdc_alloc_messages(req, GFP_NOIO)) {
4387 ceph_osdc_put_request(req);
4388 return NULL;
4389 }
4390
4391 return req;
4392 }
4393
4394 /*
4395 * Returns a handle, caller owns a ref.
4396 */
4397 struct ceph_osd_linger_request *
4398 ceph_osdc_watch(struct ceph_osd_client *osdc,
4399 struct ceph_object_id *oid,
4400 struct ceph_object_locator *oloc,
4401 rados_watchcb2_t wcb,
4402 rados_watcherrcb_t errcb,
4403 void *data)
4404 {
4405 struct ceph_osd_linger_request *lreq;
4406 int ret;
4407
4408 lreq = linger_alloc(osdc);
4409 if (!lreq)
4410 return ERR_PTR(-ENOMEM);
4411
4412 lreq->is_watch = true;
4413 lreq->wcb = wcb;
4414 lreq->errcb = errcb;
4415 lreq->data = data;
4416 lreq->watch_valid_thru = jiffies;
4417
4418 ceph_oid_copy(&lreq->t.base_oid, oid);
4419 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4420 lreq->t.flags = CEPH_OSD_FLAG_WRITE;
4421 ktime_get_real_ts(&lreq->mtime);
4422
4423 lreq->reg_req = alloc_linger_request(lreq);
4424 if (!lreq->reg_req) {
4425 ret = -ENOMEM;
4426 goto err_put_lreq;
4427 }
4428
4429 lreq->ping_req = alloc_linger_request(lreq);
4430 if (!lreq->ping_req) {
4431 ret = -ENOMEM;
4432 goto err_put_lreq;
4433 }
4434
4435 down_write(&osdc->lock);
4436 linger_register(lreq); /* before osd_req_op_* */
4437 osd_req_op_watch_init(lreq->reg_req, 0, lreq->linger_id,
4438 CEPH_OSD_WATCH_OP_WATCH);
4439 osd_req_op_watch_init(lreq->ping_req, 0, lreq->linger_id,
4440 CEPH_OSD_WATCH_OP_PING);
4441 linger_submit(lreq);
4442 up_write(&osdc->lock);
4443
4444 ret = linger_reg_commit_wait(lreq);
4445 if (ret) {
4446 linger_cancel(lreq);
4447 goto err_put_lreq;
4448 }
4449
4450 return lreq;
4451
4452 err_put_lreq:
4453 linger_put(lreq);
4454 return ERR_PTR(ret);
4455 }
4456 EXPORT_SYMBOL(ceph_osdc_watch);
4457
4458 /*
4459 * Releases a ref.
4460 *
4461 * Times out after mount_timeout to preserve rbd unmap behaviour
4462 * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
4463 * with mount_timeout").
4464 */
4465 int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
4466 struct ceph_osd_linger_request *lreq)
4467 {
4468 struct ceph_options *opts = osdc->client->options;
4469 struct ceph_osd_request *req;
4470 int ret;
4471
4472 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4473 if (!req)
4474 return -ENOMEM;
4475
4476 ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4477 ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4478 req->r_flags = CEPH_OSD_FLAG_WRITE;
4479 ktime_get_real_ts(&req->r_mtime);
4480 osd_req_op_watch_init(req, 0, lreq->linger_id,
4481 CEPH_OSD_WATCH_OP_UNWATCH);
4482
4483 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4484 if (ret)
4485 goto out_put_req;
4486
4487 ceph_osdc_start_request(osdc, req, false);
4488 linger_cancel(lreq);
4489 linger_put(lreq);
4490 ret = wait_request_timeout(req, opts->mount_timeout);
4491
4492 out_put_req:
4493 ceph_osdc_put_request(req);
4494 return ret;
4495 }
4496 EXPORT_SYMBOL(ceph_osdc_unwatch);
4497
4498 static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
4499 u64 notify_id, u64 cookie, void *payload,
4500 size_t payload_len)
4501 {
4502 struct ceph_osd_req_op *op;
4503 struct ceph_pagelist *pl;
4504 int ret;
4505
4506 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
4507
4508 pl = kmalloc(sizeof(*pl), GFP_NOIO);
4509 if (!pl)
4510 return -ENOMEM;
4511
4512 ceph_pagelist_init(pl);
4513 ret = ceph_pagelist_encode_64(pl, notify_id);
4514 ret |= ceph_pagelist_encode_64(pl, cookie);
4515 if (payload) {
4516 ret |= ceph_pagelist_encode_32(pl, payload_len);
4517 ret |= ceph_pagelist_append(pl, payload, payload_len);
4518 } else {
4519 ret |= ceph_pagelist_encode_32(pl, 0);
4520 }
4521 if (ret) {
4522 ceph_pagelist_release(pl);
4523 return -ENOMEM;
4524 }
4525
4526 ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
4527 op->indata_len = pl->length;
4528 return 0;
4529 }
4530
4531 int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
4532 struct ceph_object_id *oid,
4533 struct ceph_object_locator *oloc,
4534 u64 notify_id,
4535 u64 cookie,
4536 void *payload,
4537 size_t payload_len)
4538 {
4539 struct ceph_osd_request *req;
4540 int ret;
4541
4542 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4543 if (!req)
4544 return -ENOMEM;
4545
4546 ceph_oid_copy(&req->r_base_oid, oid);
4547 ceph_oloc_copy(&req->r_base_oloc, oloc);
4548 req->r_flags = CEPH_OSD_FLAG_READ;
4549
4550 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4551 if (ret)
4552 goto out_put_req;
4553
4554 ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
4555 payload_len);
4556 if (ret)
4557 goto out_put_req;
4558
4559 ceph_osdc_start_request(osdc, req, false);
4560 ret = ceph_osdc_wait_request(osdc, req);
4561
4562 out_put_req:
4563 ceph_osdc_put_request(req);
4564 return ret;
4565 }
4566 EXPORT_SYMBOL(ceph_osdc_notify_ack);
4567
4568 static int osd_req_op_notify_init(struct ceph_osd_request *req, int which,
4569 u64 cookie, u32 prot_ver, u32 timeout,
4570 void *payload, size_t payload_len)
4571 {
4572 struct ceph_osd_req_op *op;
4573 struct ceph_pagelist *pl;
4574 int ret;
4575
4576 op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
4577 op->notify.cookie = cookie;
4578
4579 pl = kmalloc(sizeof(*pl), GFP_NOIO);
4580 if (!pl)
4581 return -ENOMEM;
4582
4583 ceph_pagelist_init(pl);
4584 ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
4585 ret |= ceph_pagelist_encode_32(pl, timeout);
4586 ret |= ceph_pagelist_encode_32(pl, payload_len);
4587 ret |= ceph_pagelist_append(pl, payload, payload_len);
4588 if (ret) {
4589 ceph_pagelist_release(pl);
4590 return -ENOMEM;
4591 }
4592
4593 ceph_osd_data_pagelist_init(&op->notify.request_data, pl);
4594 op->indata_len = pl->length;
4595 return 0;
4596 }
4597
4598 /*
4599 * @timeout: in seconds
4600 *
4601 * @preply_{pages,len} are initialized both on success and error.
4602 * The caller is responsible for:
4603 *
4604 * ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
4605 */
4606 int ceph_osdc_notify(struct ceph_osd_client *osdc,
4607 struct ceph_object_id *oid,
4608 struct ceph_object_locator *oloc,
4609 void *payload,
4610 size_t payload_len,
4611 u32 timeout,
4612 struct page ***preply_pages,
4613 size_t *preply_len)
4614 {
4615 struct ceph_osd_linger_request *lreq;
4616 struct page **pages;
4617 int ret;
4618
4619 WARN_ON(!timeout);
4620 if (preply_pages) {
4621 *preply_pages = NULL;
4622 *preply_len = 0;
4623 }
4624
4625 lreq = linger_alloc(osdc);
4626 if (!lreq)
4627 return -ENOMEM;
4628
4629 lreq->preply_pages = preply_pages;
4630 lreq->preply_len = preply_len;
4631
4632 ceph_oid_copy(&lreq->t.base_oid, oid);
4633 ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4634 lreq->t.flags = CEPH_OSD_FLAG_READ;
4635
4636 lreq->reg_req = alloc_linger_request(lreq);
4637 if (!lreq->reg_req) {
4638 ret = -ENOMEM;
4639 goto out_put_lreq;
4640 }
4641
4642 /* for notify_id */
4643 pages = ceph_alloc_page_vector(1, GFP_NOIO);
4644 if (IS_ERR(pages)) {
4645 ret = PTR_ERR(pages);
4646 goto out_put_lreq;
4647 }
4648
4649 down_write(&osdc->lock);
4650 linger_register(lreq); /* before osd_req_op_* */
4651 ret = osd_req_op_notify_init(lreq->reg_req, 0, lreq->linger_id, 1,
4652 timeout, payload, payload_len);
4653 if (ret) {
4654 linger_unregister(lreq);
4655 up_write(&osdc->lock);
4656 ceph_release_page_vector(pages, 1);
4657 goto out_put_lreq;
4658 }
4659 ceph_osd_data_pages_init(osd_req_op_data(lreq->reg_req, 0, notify,
4660 response_data),
4661 pages, PAGE_SIZE, 0, false, true);
4662 linger_submit(lreq);
4663 up_write(&osdc->lock);
4664
4665 ret = linger_reg_commit_wait(lreq);
4666 if (!ret)
4667 ret = linger_notify_finish_wait(lreq);
4668 else
4669 dout("lreq %p failed to initiate notify %d\n", lreq, ret);
4670
4671 linger_cancel(lreq);
4672 out_put_lreq:
4673 linger_put(lreq);
4674 return ret;
4675 }
4676 EXPORT_SYMBOL(ceph_osdc_notify);
4677
4678 /*
4679 * Return the number of milliseconds since the watch was last
4680 * confirmed, or an error. If there is an error, the watch is no
4681 * longer valid, and should be destroyed with ceph_osdc_unwatch().
4682 */
4683 int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
4684 struct ceph_osd_linger_request *lreq)
4685 {
4686 unsigned long stamp, age;
4687 int ret;
4688
4689 down_read(&osdc->lock);
4690 mutex_lock(&lreq->lock);
4691 stamp = lreq->watch_valid_thru;
4692 if (!list_empty(&lreq->pending_lworks)) {
4693 struct linger_work *lwork =
4694 list_first_entry(&lreq->pending_lworks,
4695 struct linger_work,
4696 pending_item);
4697
4698 if (time_before(lwork->queued_stamp, stamp))
4699 stamp = lwork->queued_stamp;
4700 }
4701 age = jiffies - stamp;
4702 dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
4703 lreq, lreq->linger_id, age, lreq->last_error);
4704 /* we are truncating to msecs, so return a safe upper bound */
4705 ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
4706
4707 mutex_unlock(&lreq->lock);
4708 up_read(&osdc->lock);
4709 return ret;
4710 }
4711
4712 static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
4713 {
4714 u8 struct_v;
4715 u32 struct_len;
4716 int ret;
4717
4718 ret = ceph_start_decoding(p, end, 2, "watch_item_t",
4719 &struct_v, &struct_len);
4720 if (ret)
4721 return ret;
4722
4723 ceph_decode_copy(p, &item->name, sizeof(item->name));
4724 item->cookie = ceph_decode_64(p);
4725 *p += 4; /* skip timeout_seconds */
4726 if (struct_v >= 2) {
4727 ceph_decode_copy(p, &item->addr, sizeof(item->addr));
4728 ceph_decode_addr(&item->addr);
4729 }
4730
4731 dout("%s %s%llu cookie %llu addr %s\n", __func__,
4732 ENTITY_NAME(item->name), item->cookie,
4733 ceph_pr_addr(&item->addr.in_addr));
4734 return 0;
4735 }
4736
4737 static int decode_watchers(void **p, void *end,
4738 struct ceph_watch_item **watchers,
4739 u32 *num_watchers)
4740 {
4741 u8 struct_v;
4742 u32 struct_len;
4743 int i;
4744 int ret;
4745
4746 ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
4747 &struct_v, &struct_len);
4748 if (ret)
4749 return ret;
4750
4751 *num_watchers = ceph_decode_32(p);
4752 *watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
4753 if (!*watchers)
4754 return -ENOMEM;
4755
4756 for (i = 0; i < *num_watchers; i++) {
4757 ret = decode_watcher(p, end, *watchers + i);
4758 if (ret) {
4759 kfree(*watchers);
4760 return ret;
4761 }
4762 }
4763
4764 return 0;
4765 }
4766
4767 /*
4768 * On success, the caller is responsible for:
4769 *
4770 * kfree(watchers);
4771 */
4772 int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
4773 struct ceph_object_id *oid,
4774 struct ceph_object_locator *oloc,
4775 struct ceph_watch_item **watchers,
4776 u32 *num_watchers)
4777 {
4778 struct ceph_osd_request *req;
4779 struct page **pages;
4780 int ret;
4781
4782 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4783 if (!req)
4784 return -ENOMEM;
4785
4786 ceph_oid_copy(&req->r_base_oid, oid);
4787 ceph_oloc_copy(&req->r_base_oloc, oloc);
4788 req->r_flags = CEPH_OSD_FLAG_READ;
4789
4790 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4791 if (ret)
4792 goto out_put_req;
4793
4794 pages = ceph_alloc_page_vector(1, GFP_NOIO);
4795 if (IS_ERR(pages)) {
4796 ret = PTR_ERR(pages);
4797 goto out_put_req;
4798 }
4799
4800 osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
4801 ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
4802 response_data),
4803 pages, PAGE_SIZE, 0, false, true);
4804
4805 ceph_osdc_start_request(osdc, req, false);
4806 ret = ceph_osdc_wait_request(osdc, req);
4807 if (ret >= 0) {
4808 void *p = page_address(pages[0]);
4809 void *const end = p + req->r_ops[0].outdata_len;
4810
4811 ret = decode_watchers(&p, end, watchers, num_watchers);
4812 }
4813
4814 out_put_req:
4815 ceph_osdc_put_request(req);
4816 return ret;
4817 }
4818 EXPORT_SYMBOL(ceph_osdc_list_watchers);
4819
4820 /*
4821 * Call all pending notify callbacks - for use after a watch is
4822 * unregistered, to make sure no more callbacks for it will be invoked
4823 */
4824 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
4825 {
4826 dout("%s osdc %p\n", __func__, osdc);
4827 flush_workqueue(osdc->notify_wq);
4828 }
4829 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
4830
4831 void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
4832 {
4833 down_read(&osdc->lock);
4834 maybe_request_map(osdc);
4835 up_read(&osdc->lock);
4836 }
4837 EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
4838
4839 /*
4840 * Execute an OSD class method on an object.
4841 *
4842 * @flags: CEPH_OSD_FLAG_*
4843 * @resp_len: in/out param for reply length
4844 */
4845 int ceph_osdc_call(struct ceph_osd_client *osdc,
4846 struct ceph_object_id *oid,
4847 struct ceph_object_locator *oloc,
4848 const char *class, const char *method,
4849 unsigned int flags,
4850 struct page *req_page, size_t req_len,
4851 struct page *resp_page, size_t *resp_len)
4852 {
4853 struct ceph_osd_request *req;
4854 int ret;
4855
4856 if (req_len > PAGE_SIZE || (resp_page && *resp_len > PAGE_SIZE))
4857 return -E2BIG;
4858
4859 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4860 if (!req)
4861 return -ENOMEM;
4862
4863 ceph_oid_copy(&req->r_base_oid, oid);
4864 ceph_oloc_copy(&req->r_base_oloc, oloc);
4865 req->r_flags = flags;
4866
4867 ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4868 if (ret)
4869 goto out_put_req;
4870
4871 osd_req_op_cls_init(req, 0, CEPH_OSD_OP_CALL, class, method);
4872 if (req_page)
4873 osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
4874 0, false, false);
4875 if (resp_page)
4876 osd_req_op_cls_response_data_pages(req, 0, &resp_page,
4877 *resp_len, 0, false, false);
4878
4879 ceph_osdc_start_request(osdc, req, false);
4880 ret = ceph_osdc_wait_request(osdc, req);
4881 if (ret >= 0) {
4882 ret = req->r_ops[0].rval;
4883 if (resp_page)
4884 *resp_len = req->r_ops[0].outdata_len;
4885 }
4886
4887 out_put_req:
4888 ceph_osdc_put_request(req);
4889 return ret;
4890 }
4891 EXPORT_SYMBOL(ceph_osdc_call);
4892
4893 /*
4894 * init, shutdown
4895 */
4896 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
4897 {
4898 int err;
4899
4900 dout("init\n");
4901 osdc->client = client;
4902 init_rwsem(&osdc->lock);
4903 osdc->osds = RB_ROOT;
4904 INIT_LIST_HEAD(&osdc->osd_lru);
4905 spin_lock_init(&osdc->osd_lru_lock);
4906 osd_init(&osdc->homeless_osd);
4907 osdc->homeless_osd.o_osdc = osdc;
4908 osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
4909 osdc->last_linger_id = CEPH_LINGER_ID_START;
4910 osdc->linger_requests = RB_ROOT;
4911 osdc->map_checks = RB_ROOT;
4912 osdc->linger_map_checks = RB_ROOT;
4913 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
4914 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
4915
4916 err = -ENOMEM;
4917 osdc->osdmap = ceph_osdmap_alloc();
4918 if (!osdc->osdmap)
4919 goto out;
4920
4921 osdc->req_mempool = mempool_create_slab_pool(10,
4922 ceph_osd_request_cache);
4923 if (!osdc->req_mempool)
4924 goto out_map;
4925
4926 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
4927 PAGE_SIZE, 10, true, "osd_op");
4928 if (err < 0)
4929 goto out_mempool;
4930 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
4931 PAGE_SIZE, 10, true, "osd_op_reply");
4932 if (err < 0)
4933 goto out_msgpool;
4934
4935 err = -ENOMEM;
4936 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
4937 if (!osdc->notify_wq)
4938 goto out_msgpool_reply;
4939
4940 schedule_delayed_work(&osdc->timeout_work,
4941 osdc->client->options->osd_keepalive_timeout);
4942 schedule_delayed_work(&osdc->osds_timeout_work,
4943 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
4944
4945 return 0;
4946
4947 out_msgpool_reply:
4948 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4949 out_msgpool:
4950 ceph_msgpool_destroy(&osdc->msgpool_op);
4951 out_mempool:
4952 mempool_destroy(osdc->req_mempool);
4953 out_map:
4954 ceph_osdmap_destroy(osdc->osdmap);
4955 out:
4956 return err;
4957 }
4958
4959 void ceph_osdc_stop(struct ceph_osd_client *osdc)
4960 {
4961 flush_workqueue(osdc->notify_wq);
4962 destroy_workqueue(osdc->notify_wq);
4963 cancel_delayed_work_sync(&osdc->timeout_work);
4964 cancel_delayed_work_sync(&osdc->osds_timeout_work);
4965
4966 down_write(&osdc->lock);
4967 while (!RB_EMPTY_ROOT(&osdc->osds)) {
4968 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
4969 struct ceph_osd, o_node);
4970 close_osd(osd);
4971 }
4972 up_write(&osdc->lock);
4973 WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
4974 osd_cleanup(&osdc->homeless_osd);
4975
4976 WARN_ON(!list_empty(&osdc->osd_lru));
4977 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
4978 WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
4979 WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
4980 WARN_ON(atomic_read(&osdc->num_requests));
4981 WARN_ON(atomic_read(&osdc->num_homeless));
4982
4983 ceph_osdmap_destroy(osdc->osdmap);
4984 mempool_destroy(osdc->req_mempool);
4985 ceph_msgpool_destroy(&osdc->msgpool_op);
4986 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4987 }
4988
4989 /*
4990 * Read some contiguous pages. If we cross a stripe boundary, shorten
4991 * *plen. Return number of bytes read, or error.
4992 */
4993 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
4994 struct ceph_vino vino, struct ceph_file_layout *layout,
4995 u64 off, u64 *plen,
4996 u32 truncate_seq, u64 truncate_size,
4997 struct page **pages, int num_pages, int page_align)
4998 {
4999 struct ceph_osd_request *req;
5000 int rc = 0;
5001
5002 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
5003 vino.snap, off, *plen);
5004 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
5005 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
5006 NULL, truncate_seq, truncate_size,
5007 false);
5008 if (IS_ERR(req))
5009 return PTR_ERR(req);
5010
5011 /* it may be a short read due to an object boundary */
5012 osd_req_op_extent_osd_data_pages(req, 0,
5013 pages, *plen, page_align, false, false);
5014
5015 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
5016 off, *plen, *plen, page_align);
5017
5018 rc = ceph_osdc_start_request(osdc, req, false);
5019 if (!rc)
5020 rc = ceph_osdc_wait_request(osdc, req);
5021
5022 ceph_osdc_put_request(req);
5023 dout("readpages result %d\n", rc);
5024 return rc;
5025 }
5026 EXPORT_SYMBOL(ceph_osdc_readpages);
5027
5028 /*
5029 * do a synchronous write on N pages
5030 */
5031 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
5032 struct ceph_file_layout *layout,
5033 struct ceph_snap_context *snapc,
5034 u64 off, u64 len,
5035 u32 truncate_seq, u64 truncate_size,
5036 struct timespec *mtime,
5037 struct page **pages, int num_pages)
5038 {
5039 struct ceph_osd_request *req;
5040 int rc = 0;
5041 int page_align = off & ~PAGE_MASK;
5042
5043 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
5044 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
5045 snapc, truncate_seq, truncate_size,
5046 true);
5047 if (IS_ERR(req))
5048 return PTR_ERR(req);
5049
5050 /* it may be a short write due to an object boundary */
5051 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
5052 false, false);
5053 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
5054
5055 req->r_mtime = *mtime;
5056 rc = ceph_osdc_start_request(osdc, req, true);
5057 if (!rc)
5058 rc = ceph_osdc_wait_request(osdc, req);
5059
5060 ceph_osdc_put_request(req);
5061 if (rc == 0)
5062 rc = len;
5063 dout("writepages result %d\n", rc);
5064 return rc;
5065 }
5066 EXPORT_SYMBOL(ceph_osdc_writepages);
5067
5068 int ceph_osdc_setup(void)
5069 {
5070 size_t size = sizeof(struct ceph_osd_request) +
5071 CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
5072
5073 BUG_ON(ceph_osd_request_cache);
5074 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
5075 0, 0, NULL);
5076
5077 return ceph_osd_request_cache ? 0 : -ENOMEM;
5078 }
5079 EXPORT_SYMBOL(ceph_osdc_setup);
5080
5081 void ceph_osdc_cleanup(void)
5082 {
5083 BUG_ON(!ceph_osd_request_cache);
5084 kmem_cache_destroy(ceph_osd_request_cache);
5085 ceph_osd_request_cache = NULL;
5086 }
5087 EXPORT_SYMBOL(ceph_osdc_cleanup);
5088
5089 /*
5090 * handle incoming message
5091 */
5092 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5093 {
5094 struct ceph_osd *osd = con->private;
5095 struct ceph_osd_client *osdc = osd->o_osdc;
5096 int type = le16_to_cpu(msg->hdr.type);
5097
5098 switch (type) {
5099 case CEPH_MSG_OSD_MAP:
5100 ceph_osdc_handle_map(osdc, msg);
5101 break;
5102 case CEPH_MSG_OSD_OPREPLY:
5103 handle_reply(osd, msg);
5104 break;
5105 case CEPH_MSG_OSD_BACKOFF:
5106 handle_backoff(osd, msg);
5107 break;
5108 case CEPH_MSG_WATCH_NOTIFY:
5109 handle_watch_notify(osdc, msg);
5110 break;
5111
5112 default:
5113 pr_err("received unknown message type %d %s\n", type,
5114 ceph_msg_type_name(type));
5115 }
5116
5117 ceph_msg_put(msg);
5118 }
5119
5120 /*
5121 * Lookup and return message for incoming reply. Don't try to do
5122 * anything about a larger than preallocated data portion of the
5123 * message at the moment - for now, just skip the message.
5124 */
5125 static struct ceph_msg *get_reply(struct ceph_connection *con,
5126 struct ceph_msg_header *hdr,
5127 int *skip)
5128 {
5129 struct ceph_osd *osd = con->private;
5130 struct ceph_osd_client *osdc = osd->o_osdc;
5131 struct ceph_msg *m = NULL;
5132 struct ceph_osd_request *req;
5133 int front_len = le32_to_cpu(hdr->front_len);
5134 int data_len = le32_to_cpu(hdr->data_len);
5135 u64 tid = le64_to_cpu(hdr->tid);
5136
5137 down_read(&osdc->lock);
5138 if (!osd_registered(osd)) {
5139 dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
5140 *skip = 1;
5141 goto out_unlock_osdc;
5142 }
5143 WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));
5144
5145 mutex_lock(&osd->lock);
5146 req = lookup_request(&osd->o_requests, tid);
5147 if (!req) {
5148 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
5149 osd->o_osd, tid);
5150 *skip = 1;
5151 goto out_unlock_session;
5152 }
5153
5154 ceph_msg_revoke_incoming(req->r_reply);
5155
5156 if (front_len > req->r_reply->front_alloc_len) {
5157 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
5158 __func__, osd->o_osd, req->r_tid, front_len,
5159 req->r_reply->front_alloc_len);
5160 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
5161 false);
5162 if (!m)
5163 goto out_unlock_session;
5164 ceph_msg_put(req->r_reply);
5165 req->r_reply = m;
5166 }
5167
5168 if (data_len > req->r_reply->data_length) {
5169 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
5170 __func__, osd->o_osd, req->r_tid, data_len,
5171 req->r_reply->data_length);
5172 m = NULL;
5173 *skip = 1;
5174 goto out_unlock_session;
5175 }
5176
5177 m = ceph_msg_get(req->r_reply);
5178 dout("get_reply tid %lld %p\n", tid, m);
5179
5180 out_unlock_session:
5181 mutex_unlock(&osd->lock);
5182 out_unlock_osdc:
5183 up_read(&osdc->lock);
5184 return m;
5185 }
5186
5187 /*
5188 * TODO: switch to a msg-owned pagelist
5189 */
5190 static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
5191 {
5192 struct ceph_msg *m;
5193 int type = le16_to_cpu(hdr->type);
5194 u32 front_len = le32_to_cpu(hdr->front_len);
5195 u32 data_len = le32_to_cpu(hdr->data_len);
5196
5197 m = ceph_msg_new(type, front_len, GFP_NOIO, false);
5198 if (!m)
5199 return NULL;
5200
5201 if (data_len) {
5202 struct page **pages;
5203 struct ceph_osd_data osd_data;
5204
5205 pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
5206 GFP_NOIO);
5207 if (IS_ERR(pages)) {
5208 ceph_msg_put(m);
5209 return NULL;
5210 }
5211
5212 ceph_osd_data_pages_init(&osd_data, pages, data_len, 0, false,
5213 false);
5214 ceph_osdc_msg_data_add(m, &osd_data);
5215 }
5216
5217 return m;
5218 }
5219
5220 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
5221 struct ceph_msg_header *hdr,
5222 int *skip)
5223 {
5224 struct ceph_osd *osd = con->private;
5225 int type = le16_to_cpu(hdr->type);
5226
5227 *skip = 0;
5228 switch (type) {
5229 case CEPH_MSG_OSD_MAP:
5230 case CEPH_MSG_OSD_BACKOFF:
5231 case CEPH_MSG_WATCH_NOTIFY:
5232 return alloc_msg_with_page_vector(hdr);
5233 case CEPH_MSG_OSD_OPREPLY:
5234 return get_reply(con, hdr, skip);
5235 default:
5236 pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
5237 osd->o_osd, type);
5238 *skip = 1;
5239 return NULL;
5240 }
5241 }
5242
5243 /*
5244 * Wrappers to refcount containing ceph_osd struct
5245 */
5246 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
5247 {
5248 struct ceph_osd *osd = con->private;
5249 if (get_osd(osd))
5250 return con;
5251 return NULL;
5252 }
5253
5254 static void put_osd_con(struct ceph_connection *con)
5255 {
5256 struct ceph_osd *osd = con->private;
5257 put_osd(osd);
5258 }
5259
5260 /*
5261 * authentication
5262 */
5263 /*
5264 * Note: returned pointer is the address of a structure that's
5265 * managed separately. Caller must *not* attempt to free it.
5266 */
5267 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
5268 int *proto, int force_new)
5269 {
5270 struct ceph_osd *o = con->private;
5271 struct ceph_osd_client *osdc = o->o_osdc;
5272 struct ceph_auth_client *ac = osdc->client->monc.auth;
5273 struct ceph_auth_handshake *auth = &o->o_auth;
5274
5275 if (force_new && auth->authorizer) {
5276 ceph_auth_destroy_authorizer(auth->authorizer);
5277 auth->authorizer = NULL;
5278 }
5279 if (!auth->authorizer) {
5280 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5281 auth);
5282 if (ret)
5283 return ERR_PTR(ret);
5284 } else {
5285 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5286 auth);
5287 if (ret)
5288 return ERR_PTR(ret);
5289 }
5290 *proto = ac->protocol;
5291
5292 return auth;
5293 }
5294
5295
5296 static int verify_authorizer_reply(struct ceph_connection *con)
5297 {
5298 struct ceph_osd *o = con->private;
5299 struct ceph_osd_client *osdc = o->o_osdc;
5300 struct ceph_auth_client *ac = osdc->client->monc.auth;
5301
5302 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer);
5303 }
5304
5305 static int invalidate_authorizer(struct ceph_connection *con)
5306 {
5307 struct ceph_osd *o = con->private;
5308 struct ceph_osd_client *osdc = o->o_osdc;
5309 struct ceph_auth_client *ac = osdc->client->monc.auth;
5310
5311 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
5312 return ceph_monc_validate_auth(&osdc->client->monc);
5313 }
5314
5315 static void osd_reencode_message(struct ceph_msg *msg)
5316 {
5317 int type = le16_to_cpu(msg->hdr.type);
5318
5319 if (type == CEPH_MSG_OSD_OP)
5320 encode_request_finish(msg);
5321 }
5322
5323 static int osd_sign_message(struct ceph_msg *msg)
5324 {
5325 struct ceph_osd *o = msg->con->private;
5326 struct ceph_auth_handshake *auth = &o->o_auth;
5327
5328 return ceph_auth_sign_message(auth, msg);
5329 }
5330
5331 static int osd_check_message_signature(struct ceph_msg *msg)
5332 {
5333 struct ceph_osd *o = msg->con->private;
5334 struct ceph_auth_handshake *auth = &o->o_auth;
5335
5336 return ceph_auth_check_message_signature(auth, msg);
5337 }
5338
5339 static const struct ceph_connection_operations osd_con_ops = {
5340 .get = get_osd_con,
5341 .put = put_osd_con,
5342 .dispatch = dispatch,
5343 .get_authorizer = get_authorizer,
5344 .verify_authorizer_reply = verify_authorizer_reply,
5345 .invalidate_authorizer = invalidate_authorizer,
5346 .alloc_msg = alloc_msg,
5347 .reencode_message = osd_reencode_message,
5348 .sign_message = osd_sign_message,
5349 .check_message_signature = osd_check_message_signature,
5350 .fault = osd_fault,
5351 };
Linux with added FPC-III support