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