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Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[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_OP_FRONT_LEN 4096
23 #define OSD_OPREPLY_FRONT_LEN 512
24
25 static struct kmem_cache *ceph_osd_request_cache;
26
27 static const struct ceph_connection_operations osd_con_ops;
28
29 static void __send_queued(struct ceph_osd_client *osdc);
30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
31 static void __register_request(struct ceph_osd_client *osdc,
32 struct ceph_osd_request *req);
33 static void __unregister_request(struct ceph_osd_client *osdc,
34 struct ceph_osd_request *req);
35 static void __unregister_linger_request(struct ceph_osd_client *osdc,
36 struct ceph_osd_request *req);
37 static void __enqueue_request(struct ceph_osd_request *req);
38 static void __send_request(struct ceph_osd_client *osdc,
39 struct ceph_osd_request *req);
40
41 /*
42 * Implement client access to distributed object storage cluster.
43 *
44 * All data objects are stored within a cluster/cloud of OSDs, or
45 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
46 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
47 * remote daemons serving up and coordinating consistent and safe
48 * access to storage.
49 *
50 * Cluster membership and the mapping of data objects onto storage devices
51 * are described by the osd map.
52 *
53 * We keep track of pending OSD requests (read, write), resubmit
54 * requests to different OSDs when the cluster topology/data layout
55 * change, or retry the affected requests when the communications
56 * channel with an OSD is reset.
57 */
58
59 /*
60 * calculate the mapping of a file extent onto an object, and fill out the
61 * request accordingly. shorten extent as necessary if it crosses an
62 * object boundary.
63 *
64 * fill osd op in request message.
65 */
66 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
67 u64 *objnum, u64 *objoff, u64 *objlen)
68 {
69 u64 orig_len = *plen;
70 int r;
71
72 /* object extent? */
73 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
74 objoff, objlen);
75 if (r < 0)
76 return r;
77 if (*objlen < orig_len) {
78 *plen = *objlen;
79 dout(" skipping last %llu, final file extent %llu~%llu\n",
80 orig_len - *plen, off, *plen);
81 }
82
83 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
84
85 return 0;
86 }
87
88 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
89 {
90 memset(osd_data, 0, sizeof (*osd_data));
91 osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
92 }
93
94 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
95 struct page **pages, u64 length, u32 alignment,
96 bool pages_from_pool, bool own_pages)
97 {
98 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
99 osd_data->pages = pages;
100 osd_data->length = length;
101 osd_data->alignment = alignment;
102 osd_data->pages_from_pool = pages_from_pool;
103 osd_data->own_pages = own_pages;
104 }
105
106 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
107 struct ceph_pagelist *pagelist)
108 {
109 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
110 osd_data->pagelist = pagelist;
111 }
112
113 #ifdef CONFIG_BLOCK
114 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
115 struct bio *bio, size_t bio_length)
116 {
117 osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
118 osd_data->bio = bio;
119 osd_data->bio_length = bio_length;
120 }
121 #endif /* CONFIG_BLOCK */
122
123 #define osd_req_op_data(oreq, whch, typ, fld) \
124 ({ \
125 struct ceph_osd_request *__oreq = (oreq); \
126 unsigned int __whch = (whch); \
127 BUG_ON(__whch >= __oreq->r_num_ops); \
128 &__oreq->r_ops[__whch].typ.fld; \
129 })
130
131 static struct ceph_osd_data *
132 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
133 {
134 BUG_ON(which >= osd_req->r_num_ops);
135
136 return &osd_req->r_ops[which].raw_data_in;
137 }
138
139 struct ceph_osd_data *
140 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
141 unsigned int which)
142 {
143 return osd_req_op_data(osd_req, which, extent, osd_data);
144 }
145 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
146
147 struct ceph_osd_data *
148 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
149 unsigned int which)
150 {
151 return osd_req_op_data(osd_req, which, cls, response_data);
152 }
153 EXPORT_SYMBOL(osd_req_op_cls_response_data); /* ??? */
154
155 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
156 unsigned int which, struct page **pages,
157 u64 length, u32 alignment,
158 bool pages_from_pool, bool own_pages)
159 {
160 struct ceph_osd_data *osd_data;
161
162 osd_data = osd_req_op_raw_data_in(osd_req, which);
163 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
164 pages_from_pool, own_pages);
165 }
166 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
167
168 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
169 unsigned int which, struct page **pages,
170 u64 length, u32 alignment,
171 bool pages_from_pool, bool own_pages)
172 {
173 struct ceph_osd_data *osd_data;
174
175 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
176 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
177 pages_from_pool, own_pages);
178 }
179 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
180
181 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
182 unsigned int which, struct ceph_pagelist *pagelist)
183 {
184 struct ceph_osd_data *osd_data;
185
186 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
187 ceph_osd_data_pagelist_init(osd_data, pagelist);
188 }
189 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
190
191 #ifdef CONFIG_BLOCK
192 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
193 unsigned int which, struct bio *bio, size_t bio_length)
194 {
195 struct ceph_osd_data *osd_data;
196
197 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
198 ceph_osd_data_bio_init(osd_data, bio, bio_length);
199 }
200 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
201 #endif /* CONFIG_BLOCK */
202
203 static void osd_req_op_cls_request_info_pagelist(
204 struct ceph_osd_request *osd_req,
205 unsigned int which, struct ceph_pagelist *pagelist)
206 {
207 struct ceph_osd_data *osd_data;
208
209 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
210 ceph_osd_data_pagelist_init(osd_data, pagelist);
211 }
212
213 void osd_req_op_cls_request_data_pagelist(
214 struct ceph_osd_request *osd_req,
215 unsigned int which, struct ceph_pagelist *pagelist)
216 {
217 struct ceph_osd_data *osd_data;
218
219 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
220 ceph_osd_data_pagelist_init(osd_data, pagelist);
221 }
222 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
223
224 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
225 unsigned int which, struct page **pages, u64 length,
226 u32 alignment, bool pages_from_pool, bool own_pages)
227 {
228 struct ceph_osd_data *osd_data;
229
230 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
231 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
232 pages_from_pool, own_pages);
233 }
234 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
235
236 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
237 unsigned int which, struct page **pages, u64 length,
238 u32 alignment, bool pages_from_pool, bool own_pages)
239 {
240 struct ceph_osd_data *osd_data;
241
242 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
243 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
244 pages_from_pool, own_pages);
245 }
246 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
247
248 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
249 {
250 switch (osd_data->type) {
251 case CEPH_OSD_DATA_TYPE_NONE:
252 return 0;
253 case CEPH_OSD_DATA_TYPE_PAGES:
254 return osd_data->length;
255 case CEPH_OSD_DATA_TYPE_PAGELIST:
256 return (u64)osd_data->pagelist->length;
257 #ifdef CONFIG_BLOCK
258 case CEPH_OSD_DATA_TYPE_BIO:
259 return (u64)osd_data->bio_length;
260 #endif /* CONFIG_BLOCK */
261 default:
262 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
263 return 0;
264 }
265 }
266
267 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
268 {
269 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
270 int num_pages;
271
272 num_pages = calc_pages_for((u64)osd_data->alignment,
273 (u64)osd_data->length);
274 ceph_release_page_vector(osd_data->pages, num_pages);
275 }
276 ceph_osd_data_init(osd_data);
277 }
278
279 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
280 unsigned int which)
281 {
282 struct ceph_osd_req_op *op;
283
284 BUG_ON(which >= osd_req->r_num_ops);
285 op = &osd_req->r_ops[which];
286
287 switch (op->op) {
288 case CEPH_OSD_OP_READ:
289 case CEPH_OSD_OP_WRITE:
290 case CEPH_OSD_OP_WRITEFULL:
291 ceph_osd_data_release(&op->extent.osd_data);
292 break;
293 case CEPH_OSD_OP_CALL:
294 ceph_osd_data_release(&op->cls.request_info);
295 ceph_osd_data_release(&op->cls.request_data);
296 ceph_osd_data_release(&op->cls.response_data);
297 break;
298 case CEPH_OSD_OP_SETXATTR:
299 case CEPH_OSD_OP_CMPXATTR:
300 ceph_osd_data_release(&op->xattr.osd_data);
301 break;
302 case CEPH_OSD_OP_STAT:
303 ceph_osd_data_release(&op->raw_data_in);
304 break;
305 default:
306 break;
307 }
308 }
309
310 /*
311 * requests
312 */
313 static void ceph_osdc_release_request(struct kref *kref)
314 {
315 struct ceph_osd_request *req = container_of(kref,
316 struct ceph_osd_request, r_kref);
317 unsigned int which;
318
319 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
320 req->r_request, req->r_reply);
321 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
322 WARN_ON(!list_empty(&req->r_req_lru_item));
323 WARN_ON(!list_empty(&req->r_osd_item));
324 WARN_ON(!list_empty(&req->r_linger_item));
325 WARN_ON(!list_empty(&req->r_linger_osd_item));
326 WARN_ON(req->r_osd);
327
328 if (req->r_request)
329 ceph_msg_put(req->r_request);
330 if (req->r_reply) {
331 ceph_msg_revoke_incoming(req->r_reply);
332 ceph_msg_put(req->r_reply);
333 }
334
335 for (which = 0; which < req->r_num_ops; which++)
336 osd_req_op_data_release(req, which);
337
338 ceph_put_snap_context(req->r_snapc);
339 if (req->r_mempool)
340 mempool_free(req, req->r_osdc->req_mempool);
341 else
342 kmem_cache_free(ceph_osd_request_cache, req);
343
344 }
345
346 void ceph_osdc_get_request(struct ceph_osd_request *req)
347 {
348 dout("%s %p (was %d)\n", __func__, req,
349 atomic_read(&req->r_kref.refcount));
350 kref_get(&req->r_kref);
351 }
352 EXPORT_SYMBOL(ceph_osdc_get_request);
353
354 void ceph_osdc_put_request(struct ceph_osd_request *req)
355 {
356 dout("%s %p (was %d)\n", __func__, req,
357 atomic_read(&req->r_kref.refcount));
358 kref_put(&req->r_kref, ceph_osdc_release_request);
359 }
360 EXPORT_SYMBOL(ceph_osdc_put_request);
361
362 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
363 struct ceph_snap_context *snapc,
364 unsigned int num_ops,
365 bool use_mempool,
366 gfp_t gfp_flags)
367 {
368 struct ceph_osd_request *req;
369 struct ceph_msg *msg;
370 size_t msg_size;
371
372 BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
373 BUG_ON(num_ops > CEPH_OSD_MAX_OP);
374
375 msg_size = 4 + 4 + 8 + 8 + 4+8;
376 msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
377 msg_size += 1 + 8 + 4 + 4; /* pg_t */
378 msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
379 msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
380 msg_size += 8; /* snapid */
381 msg_size += 8; /* snap_seq */
382 msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
383 msg_size += 4;
384
385 if (use_mempool) {
386 req = mempool_alloc(osdc->req_mempool, gfp_flags);
387 memset(req, 0, sizeof(*req));
388 } else {
389 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
390 }
391 if (req == NULL)
392 return NULL;
393
394 req->r_osdc = osdc;
395 req->r_mempool = use_mempool;
396 req->r_num_ops = num_ops;
397
398 kref_init(&req->r_kref);
399 init_completion(&req->r_completion);
400 init_completion(&req->r_safe_completion);
401 RB_CLEAR_NODE(&req->r_node);
402 INIT_LIST_HEAD(&req->r_unsafe_item);
403 INIT_LIST_HEAD(&req->r_linger_item);
404 INIT_LIST_HEAD(&req->r_linger_osd_item);
405 INIT_LIST_HEAD(&req->r_req_lru_item);
406 INIT_LIST_HEAD(&req->r_osd_item);
407
408 req->r_base_oloc.pool = -1;
409 req->r_target_oloc.pool = -1;
410
411 /* create reply message */
412 if (use_mempool)
413 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
414 else
415 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
416 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
417 if (!msg) {
418 ceph_osdc_put_request(req);
419 return NULL;
420 }
421 req->r_reply = msg;
422
423 /* create request message; allow space for oid */
424 if (use_mempool)
425 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
426 else
427 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
428 if (!msg) {
429 ceph_osdc_put_request(req);
430 return NULL;
431 }
432
433 memset(msg->front.iov_base, 0, msg->front.iov_len);
434
435 req->r_request = msg;
436
437 return req;
438 }
439 EXPORT_SYMBOL(ceph_osdc_alloc_request);
440
441 static bool osd_req_opcode_valid(u16 opcode)
442 {
443 switch (opcode) {
444 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
445 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
446 #undef GENERATE_CASE
447 default:
448 return false;
449 }
450 }
451
452 /*
453 * This is an osd op init function for opcodes that have no data or
454 * other information associated with them. It also serves as a
455 * common init routine for all the other init functions, below.
456 */
457 static struct ceph_osd_req_op *
458 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
459 u16 opcode, u32 flags)
460 {
461 struct ceph_osd_req_op *op;
462
463 BUG_ON(which >= osd_req->r_num_ops);
464 BUG_ON(!osd_req_opcode_valid(opcode));
465
466 op = &osd_req->r_ops[which];
467 memset(op, 0, sizeof (*op));
468 op->op = opcode;
469 op->flags = flags;
470
471 return op;
472 }
473
474 void osd_req_op_init(struct ceph_osd_request *osd_req,
475 unsigned int which, u16 opcode, u32 flags)
476 {
477 (void)_osd_req_op_init(osd_req, which, opcode, flags);
478 }
479 EXPORT_SYMBOL(osd_req_op_init);
480
481 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
482 unsigned int which, u16 opcode,
483 u64 offset, u64 length,
484 u64 truncate_size, u32 truncate_seq)
485 {
486 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
487 opcode, 0);
488 size_t payload_len = 0;
489
490 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
491 opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
492 opcode != CEPH_OSD_OP_TRUNCATE);
493
494 op->extent.offset = offset;
495 op->extent.length = length;
496 op->extent.truncate_size = truncate_size;
497 op->extent.truncate_seq = truncate_seq;
498 if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
499 payload_len += length;
500
501 op->payload_len = payload_len;
502 }
503 EXPORT_SYMBOL(osd_req_op_extent_init);
504
505 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
506 unsigned int which, u64 length)
507 {
508 struct ceph_osd_req_op *op;
509 u64 previous;
510
511 BUG_ON(which >= osd_req->r_num_ops);
512 op = &osd_req->r_ops[which];
513 previous = op->extent.length;
514
515 if (length == previous)
516 return; /* Nothing to do */
517 BUG_ON(length > previous);
518
519 op->extent.length = length;
520 op->payload_len -= previous - length;
521 }
522 EXPORT_SYMBOL(osd_req_op_extent_update);
523
524 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
525 u16 opcode, const char *class, const char *method)
526 {
527 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
528 opcode, 0);
529 struct ceph_pagelist *pagelist;
530 size_t payload_len = 0;
531 size_t size;
532
533 BUG_ON(opcode != CEPH_OSD_OP_CALL);
534
535 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
536 BUG_ON(!pagelist);
537 ceph_pagelist_init(pagelist);
538
539 op->cls.class_name = class;
540 size = strlen(class);
541 BUG_ON(size > (size_t) U8_MAX);
542 op->cls.class_len = size;
543 ceph_pagelist_append(pagelist, class, size);
544 payload_len += size;
545
546 op->cls.method_name = method;
547 size = strlen(method);
548 BUG_ON(size > (size_t) U8_MAX);
549 op->cls.method_len = size;
550 ceph_pagelist_append(pagelist, method, size);
551 payload_len += size;
552
553 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
554
555 op->cls.argc = 0; /* currently unused */
556
557 op->payload_len = payload_len;
558 }
559 EXPORT_SYMBOL(osd_req_op_cls_init);
560
561 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
562 u16 opcode, const char *name, const void *value,
563 size_t size, u8 cmp_op, u8 cmp_mode)
564 {
565 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
566 opcode, 0);
567 struct ceph_pagelist *pagelist;
568 size_t payload_len;
569
570 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
571
572 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
573 if (!pagelist)
574 return -ENOMEM;
575
576 ceph_pagelist_init(pagelist);
577
578 payload_len = strlen(name);
579 op->xattr.name_len = payload_len;
580 ceph_pagelist_append(pagelist, name, payload_len);
581
582 op->xattr.value_len = size;
583 ceph_pagelist_append(pagelist, value, size);
584 payload_len += size;
585
586 op->xattr.cmp_op = cmp_op;
587 op->xattr.cmp_mode = cmp_mode;
588
589 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
590 op->payload_len = payload_len;
591 return 0;
592 }
593 EXPORT_SYMBOL(osd_req_op_xattr_init);
594
595 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
596 unsigned int which, u16 opcode,
597 u64 cookie, u64 version, int flag)
598 {
599 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
600 opcode, 0);
601
602 BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
603
604 op->watch.cookie = cookie;
605 op->watch.ver = version;
606 if (opcode == CEPH_OSD_OP_WATCH && flag)
607 op->watch.flag = (u8)1;
608 }
609 EXPORT_SYMBOL(osd_req_op_watch_init);
610
611 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
612 unsigned int which,
613 u64 expected_object_size,
614 u64 expected_write_size)
615 {
616 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
617 CEPH_OSD_OP_SETALLOCHINT,
618 0);
619
620 op->alloc_hint.expected_object_size = expected_object_size;
621 op->alloc_hint.expected_write_size = expected_write_size;
622
623 /*
624 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
625 * not worth a feature bit. Set FAILOK per-op flag to make
626 * sure older osds don't trip over an unsupported opcode.
627 */
628 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
629 }
630 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
631
632 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
633 struct ceph_osd_data *osd_data)
634 {
635 u64 length = ceph_osd_data_length(osd_data);
636
637 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
638 BUG_ON(length > (u64) SIZE_MAX);
639 if (length)
640 ceph_msg_data_add_pages(msg, osd_data->pages,
641 length, osd_data->alignment);
642 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
643 BUG_ON(!length);
644 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
645 #ifdef CONFIG_BLOCK
646 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
647 ceph_msg_data_add_bio(msg, osd_data->bio, length);
648 #endif
649 } else {
650 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
651 }
652 }
653
654 static u64 osd_req_encode_op(struct ceph_osd_request *req,
655 struct ceph_osd_op *dst, unsigned int which)
656 {
657 struct ceph_osd_req_op *src;
658 struct ceph_osd_data *osd_data;
659 u64 request_data_len = 0;
660 u64 data_length;
661
662 BUG_ON(which >= req->r_num_ops);
663 src = &req->r_ops[which];
664 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
665 pr_err("unrecognized osd opcode %d\n", src->op);
666
667 return 0;
668 }
669
670 switch (src->op) {
671 case CEPH_OSD_OP_STAT:
672 osd_data = &src->raw_data_in;
673 ceph_osdc_msg_data_add(req->r_reply, osd_data);
674 break;
675 case CEPH_OSD_OP_READ:
676 case CEPH_OSD_OP_WRITE:
677 case CEPH_OSD_OP_WRITEFULL:
678 case CEPH_OSD_OP_ZERO:
679 case CEPH_OSD_OP_TRUNCATE:
680 if (src->op == CEPH_OSD_OP_WRITE ||
681 src->op == CEPH_OSD_OP_WRITEFULL)
682 request_data_len = src->extent.length;
683 dst->extent.offset = cpu_to_le64(src->extent.offset);
684 dst->extent.length = cpu_to_le64(src->extent.length);
685 dst->extent.truncate_size =
686 cpu_to_le64(src->extent.truncate_size);
687 dst->extent.truncate_seq =
688 cpu_to_le32(src->extent.truncate_seq);
689 osd_data = &src->extent.osd_data;
690 if (src->op == CEPH_OSD_OP_WRITE ||
691 src->op == CEPH_OSD_OP_WRITEFULL)
692 ceph_osdc_msg_data_add(req->r_request, osd_data);
693 else
694 ceph_osdc_msg_data_add(req->r_reply, osd_data);
695 break;
696 case CEPH_OSD_OP_CALL:
697 dst->cls.class_len = src->cls.class_len;
698 dst->cls.method_len = src->cls.method_len;
699 osd_data = &src->cls.request_info;
700 ceph_osdc_msg_data_add(req->r_request, osd_data);
701 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
702 request_data_len = osd_data->pagelist->length;
703
704 osd_data = &src->cls.request_data;
705 data_length = ceph_osd_data_length(osd_data);
706 if (data_length) {
707 BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
708 dst->cls.indata_len = cpu_to_le32(data_length);
709 ceph_osdc_msg_data_add(req->r_request, osd_data);
710 src->payload_len += data_length;
711 request_data_len += data_length;
712 }
713 osd_data = &src->cls.response_data;
714 ceph_osdc_msg_data_add(req->r_reply, osd_data);
715 break;
716 case CEPH_OSD_OP_STARTSYNC:
717 break;
718 case CEPH_OSD_OP_NOTIFY_ACK:
719 case CEPH_OSD_OP_WATCH:
720 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
721 dst->watch.ver = cpu_to_le64(src->watch.ver);
722 dst->watch.flag = src->watch.flag;
723 break;
724 case CEPH_OSD_OP_SETALLOCHINT:
725 dst->alloc_hint.expected_object_size =
726 cpu_to_le64(src->alloc_hint.expected_object_size);
727 dst->alloc_hint.expected_write_size =
728 cpu_to_le64(src->alloc_hint.expected_write_size);
729 break;
730 case CEPH_OSD_OP_SETXATTR:
731 case CEPH_OSD_OP_CMPXATTR:
732 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
733 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
734 dst->xattr.cmp_op = src->xattr.cmp_op;
735 dst->xattr.cmp_mode = src->xattr.cmp_mode;
736 osd_data = &src->xattr.osd_data;
737 ceph_osdc_msg_data_add(req->r_request, osd_data);
738 request_data_len = osd_data->pagelist->length;
739 break;
740 case CEPH_OSD_OP_CREATE:
741 case CEPH_OSD_OP_DELETE:
742 break;
743 default:
744 pr_err("unsupported osd opcode %s\n",
745 ceph_osd_op_name(src->op));
746 WARN_ON(1);
747
748 return 0;
749 }
750
751 dst->op = cpu_to_le16(src->op);
752 dst->flags = cpu_to_le32(src->flags);
753 dst->payload_len = cpu_to_le32(src->payload_len);
754
755 return request_data_len;
756 }
757
758 /*
759 * build new request AND message, calculate layout, and adjust file
760 * extent as needed.
761 *
762 * if the file was recently truncated, we include information about its
763 * old and new size so that the object can be updated appropriately. (we
764 * avoid synchronously deleting truncated objects because it's slow.)
765 *
766 * if @do_sync, include a 'startsync' command so that the osd will flush
767 * data quickly.
768 */
769 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
770 struct ceph_file_layout *layout,
771 struct ceph_vino vino,
772 u64 off, u64 *plen,
773 unsigned int which, int num_ops,
774 int opcode, int flags,
775 struct ceph_snap_context *snapc,
776 u32 truncate_seq,
777 u64 truncate_size,
778 bool use_mempool)
779 {
780 struct ceph_osd_request *req;
781 u64 objnum = 0;
782 u64 objoff = 0;
783 u64 objlen = 0;
784 int r;
785
786 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
787 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
788 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
789
790 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
791 GFP_NOFS);
792 if (!req)
793 return ERR_PTR(-ENOMEM);
794
795 req->r_flags = flags;
796
797 /* calculate max write size */
798 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
799 if (r < 0) {
800 ceph_osdc_put_request(req);
801 return ERR_PTR(r);
802 }
803
804 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
805 osd_req_op_init(req, which, opcode, 0);
806 } else {
807 u32 object_size = le32_to_cpu(layout->fl_object_size);
808 u32 object_base = off - objoff;
809 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
810 if (truncate_size <= object_base) {
811 truncate_size = 0;
812 } else {
813 truncate_size -= object_base;
814 if (truncate_size > object_size)
815 truncate_size = object_size;
816 }
817 }
818 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
819 truncate_size, truncate_seq);
820 }
821
822 req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
823
824 snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
825 "%llx.%08llx", vino.ino, objnum);
826 req->r_base_oid.name_len = strlen(req->r_base_oid.name);
827
828 return req;
829 }
830 EXPORT_SYMBOL(ceph_osdc_new_request);
831
832 /*
833 * We keep osd requests in an rbtree, sorted by ->r_tid.
834 */
835 static void __insert_request(struct ceph_osd_client *osdc,
836 struct ceph_osd_request *new)
837 {
838 struct rb_node **p = &osdc->requests.rb_node;
839 struct rb_node *parent = NULL;
840 struct ceph_osd_request *req = NULL;
841
842 while (*p) {
843 parent = *p;
844 req = rb_entry(parent, struct ceph_osd_request, r_node);
845 if (new->r_tid < req->r_tid)
846 p = &(*p)->rb_left;
847 else if (new->r_tid > req->r_tid)
848 p = &(*p)->rb_right;
849 else
850 BUG();
851 }
852
853 rb_link_node(&new->r_node, parent, p);
854 rb_insert_color(&new->r_node, &osdc->requests);
855 }
856
857 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
858 u64 tid)
859 {
860 struct ceph_osd_request *req;
861 struct rb_node *n = osdc->requests.rb_node;
862
863 while (n) {
864 req = rb_entry(n, struct ceph_osd_request, r_node);
865 if (tid < req->r_tid)
866 n = n->rb_left;
867 else if (tid > req->r_tid)
868 n = n->rb_right;
869 else
870 return req;
871 }
872 return NULL;
873 }
874
875 static struct ceph_osd_request *
876 __lookup_request_ge(struct ceph_osd_client *osdc,
877 u64 tid)
878 {
879 struct ceph_osd_request *req;
880 struct rb_node *n = osdc->requests.rb_node;
881
882 while (n) {
883 req = rb_entry(n, struct ceph_osd_request, r_node);
884 if (tid < req->r_tid) {
885 if (!n->rb_left)
886 return req;
887 n = n->rb_left;
888 } else if (tid > req->r_tid) {
889 n = n->rb_right;
890 } else {
891 return req;
892 }
893 }
894 return NULL;
895 }
896
897 static void __kick_linger_request(struct ceph_osd_request *req)
898 {
899 struct ceph_osd_client *osdc = req->r_osdc;
900 struct ceph_osd *osd = req->r_osd;
901
902 /*
903 * Linger requests need to be resent with a new tid to avoid
904 * the dup op detection logic on the OSDs. Achieve this with
905 * a re-register dance instead of open-coding.
906 */
907 ceph_osdc_get_request(req);
908 if (!list_empty(&req->r_linger_item))
909 __unregister_linger_request(osdc, req);
910 else
911 __unregister_request(osdc, req);
912 __register_request(osdc, req);
913 ceph_osdc_put_request(req);
914
915 /*
916 * Unless request has been registered as both normal and
917 * lingering, __unregister{,_linger}_request clears r_osd.
918 * However, here we need to preserve r_osd to make sure we
919 * requeue on the same OSD.
920 */
921 WARN_ON(req->r_osd || !osd);
922 req->r_osd = osd;
923
924 dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
925 __enqueue_request(req);
926 }
927
928 /*
929 * Resubmit requests pending on the given osd.
930 */
931 static void __kick_osd_requests(struct ceph_osd_client *osdc,
932 struct ceph_osd *osd)
933 {
934 struct ceph_osd_request *req, *nreq;
935 LIST_HEAD(resend);
936 LIST_HEAD(resend_linger);
937 int err;
938
939 dout("%s osd%d\n", __func__, osd->o_osd);
940 err = __reset_osd(osdc, osd);
941 if (err)
942 return;
943
944 /*
945 * Build up a list of requests to resend by traversing the
946 * osd's list of requests. Requests for a given object are
947 * sent in tid order, and that is also the order they're
948 * kept on this list. Therefore all requests that are in
949 * flight will be found first, followed by all requests that
950 * have not yet been sent. And to resend requests while
951 * preserving this order we will want to put any sent
952 * requests back on the front of the osd client's unsent
953 * list.
954 *
955 * So we build a separate ordered list of already-sent
956 * requests for the affected osd and splice it onto the
957 * front of the osd client's unsent list. Once we've seen a
958 * request that has not yet been sent we're done. Those
959 * requests are already sitting right where they belong.
960 */
961 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
962 if (!req->r_sent)
963 break;
964
965 if (!req->r_linger) {
966 dout("%s requeueing %p tid %llu\n", __func__, req,
967 req->r_tid);
968 list_move_tail(&req->r_req_lru_item, &resend);
969 req->r_flags |= CEPH_OSD_FLAG_RETRY;
970 } else {
971 list_move_tail(&req->r_req_lru_item, &resend_linger);
972 }
973 }
974 list_splice(&resend, &osdc->req_unsent);
975
976 /*
977 * Both registered and not yet registered linger requests are
978 * enqueued with a new tid on the same OSD. We add/move them
979 * to req_unsent/o_requests at the end to keep things in tid
980 * order.
981 */
982 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
983 r_linger_osd_item) {
984 WARN_ON(!list_empty(&req->r_req_lru_item));
985 __kick_linger_request(req);
986 }
987
988 list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
989 __kick_linger_request(req);
990 }
991
992 /*
993 * If the osd connection drops, we need to resubmit all requests.
994 */
995 static void osd_reset(struct ceph_connection *con)
996 {
997 struct ceph_osd *osd = con->private;
998 struct ceph_osd_client *osdc;
999
1000 if (!osd)
1001 return;
1002 dout("osd_reset osd%d\n", osd->o_osd);
1003 osdc = osd->o_osdc;
1004 down_read(&osdc->map_sem);
1005 mutex_lock(&osdc->request_mutex);
1006 __kick_osd_requests(osdc, osd);
1007 __send_queued(osdc);
1008 mutex_unlock(&osdc->request_mutex);
1009 up_read(&osdc->map_sem);
1010 }
1011
1012 /*
1013 * Track open sessions with osds.
1014 */
1015 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1016 {
1017 struct ceph_osd *osd;
1018
1019 osd = kzalloc(sizeof(*osd), GFP_NOFS);
1020 if (!osd)
1021 return NULL;
1022
1023 atomic_set(&osd->o_ref, 1);
1024 osd->o_osdc = osdc;
1025 osd->o_osd = onum;
1026 RB_CLEAR_NODE(&osd->o_node);
1027 INIT_LIST_HEAD(&osd->o_requests);
1028 INIT_LIST_HEAD(&osd->o_linger_requests);
1029 INIT_LIST_HEAD(&osd->o_osd_lru);
1030 osd->o_incarnation = 1;
1031
1032 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1033
1034 INIT_LIST_HEAD(&osd->o_keepalive_item);
1035 return osd;
1036 }
1037
1038 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1039 {
1040 if (atomic_inc_not_zero(&osd->o_ref)) {
1041 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1042 atomic_read(&osd->o_ref));
1043 return osd;
1044 } else {
1045 dout("get_osd %p FAIL\n", osd);
1046 return NULL;
1047 }
1048 }
1049
1050 static void put_osd(struct ceph_osd *osd)
1051 {
1052 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1053 atomic_read(&osd->o_ref) - 1);
1054 if (atomic_dec_and_test(&osd->o_ref)) {
1055 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1056
1057 if (osd->o_auth.authorizer)
1058 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1059 kfree(osd);
1060 }
1061 }
1062
1063 /*
1064 * remove an osd from our map
1065 */
1066 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1067 {
1068 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1069 WARN_ON(!list_empty(&osd->o_requests));
1070 WARN_ON(!list_empty(&osd->o_linger_requests));
1071
1072 list_del_init(&osd->o_osd_lru);
1073 rb_erase(&osd->o_node, &osdc->osds);
1074 RB_CLEAR_NODE(&osd->o_node);
1075 }
1076
1077 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1078 {
1079 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1080
1081 if (!RB_EMPTY_NODE(&osd->o_node)) {
1082 ceph_con_close(&osd->o_con);
1083 __remove_osd(osdc, osd);
1084 put_osd(osd);
1085 }
1086 }
1087
1088 static void remove_all_osds(struct ceph_osd_client *osdc)
1089 {
1090 dout("%s %p\n", __func__, osdc);
1091 mutex_lock(&osdc->request_mutex);
1092 while (!RB_EMPTY_ROOT(&osdc->osds)) {
1093 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1094 struct ceph_osd, o_node);
1095 remove_osd(osdc, osd);
1096 }
1097 mutex_unlock(&osdc->request_mutex);
1098 }
1099
1100 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1101 struct ceph_osd *osd)
1102 {
1103 dout("%s %p\n", __func__, osd);
1104 BUG_ON(!list_empty(&osd->o_osd_lru));
1105
1106 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1107 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1108 }
1109
1110 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1111 struct ceph_osd *osd)
1112 {
1113 dout("%s %p\n", __func__, osd);
1114
1115 if (list_empty(&osd->o_requests) &&
1116 list_empty(&osd->o_linger_requests))
1117 __move_osd_to_lru(osdc, osd);
1118 }
1119
1120 static void __remove_osd_from_lru(struct ceph_osd *osd)
1121 {
1122 dout("__remove_osd_from_lru %p\n", osd);
1123 if (!list_empty(&osd->o_osd_lru))
1124 list_del_init(&osd->o_osd_lru);
1125 }
1126
1127 static void remove_old_osds(struct ceph_osd_client *osdc)
1128 {
1129 struct ceph_osd *osd, *nosd;
1130
1131 dout("__remove_old_osds %p\n", osdc);
1132 mutex_lock(&osdc->request_mutex);
1133 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1134 if (time_before(jiffies, osd->lru_ttl))
1135 break;
1136 remove_osd(osdc, osd);
1137 }
1138 mutex_unlock(&osdc->request_mutex);
1139 }
1140
1141 /*
1142 * reset osd connect
1143 */
1144 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1145 {
1146 struct ceph_entity_addr *peer_addr;
1147
1148 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1149 if (list_empty(&osd->o_requests) &&
1150 list_empty(&osd->o_linger_requests)) {
1151 remove_osd(osdc, osd);
1152 return -ENODEV;
1153 }
1154
1155 peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1156 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1157 !ceph_con_opened(&osd->o_con)) {
1158 struct ceph_osd_request *req;
1159
1160 dout("osd addr hasn't changed and connection never opened, "
1161 "letting msgr retry\n");
1162 /* touch each r_stamp for handle_timeout()'s benfit */
1163 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1164 req->r_stamp = jiffies;
1165
1166 return -EAGAIN;
1167 }
1168
1169 ceph_con_close(&osd->o_con);
1170 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1171 osd->o_incarnation++;
1172
1173 return 0;
1174 }
1175
1176 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1177 {
1178 struct rb_node **p = &osdc->osds.rb_node;
1179 struct rb_node *parent = NULL;
1180 struct ceph_osd *osd = NULL;
1181
1182 dout("__insert_osd %p osd%d\n", new, new->o_osd);
1183 while (*p) {
1184 parent = *p;
1185 osd = rb_entry(parent, struct ceph_osd, o_node);
1186 if (new->o_osd < osd->o_osd)
1187 p = &(*p)->rb_left;
1188 else if (new->o_osd > osd->o_osd)
1189 p = &(*p)->rb_right;
1190 else
1191 BUG();
1192 }
1193
1194 rb_link_node(&new->o_node, parent, p);
1195 rb_insert_color(&new->o_node, &osdc->osds);
1196 }
1197
1198 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1199 {
1200 struct ceph_osd *osd;
1201 struct rb_node *n = osdc->osds.rb_node;
1202
1203 while (n) {
1204 osd = rb_entry(n, struct ceph_osd, o_node);
1205 if (o < osd->o_osd)
1206 n = n->rb_left;
1207 else if (o > osd->o_osd)
1208 n = n->rb_right;
1209 else
1210 return osd;
1211 }
1212 return NULL;
1213 }
1214
1215 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1216 {
1217 schedule_delayed_work(&osdc->timeout_work,
1218 osdc->client->options->osd_keepalive_timeout);
1219 }
1220
1221 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1222 {
1223 cancel_delayed_work(&osdc->timeout_work);
1224 }
1225
1226 /*
1227 * Register request, assign tid. If this is the first request, set up
1228 * the timeout event.
1229 */
1230 static void __register_request(struct ceph_osd_client *osdc,
1231 struct ceph_osd_request *req)
1232 {
1233 req->r_tid = ++osdc->last_tid;
1234 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1235 dout("__register_request %p tid %lld\n", req, req->r_tid);
1236 __insert_request(osdc, req);
1237 ceph_osdc_get_request(req);
1238 osdc->num_requests++;
1239 if (osdc->num_requests == 1) {
1240 dout(" first request, scheduling timeout\n");
1241 __schedule_osd_timeout(osdc);
1242 }
1243 }
1244
1245 /*
1246 * called under osdc->request_mutex
1247 */
1248 static void __unregister_request(struct ceph_osd_client *osdc,
1249 struct ceph_osd_request *req)
1250 {
1251 if (RB_EMPTY_NODE(&req->r_node)) {
1252 dout("__unregister_request %p tid %lld not registered\n",
1253 req, req->r_tid);
1254 return;
1255 }
1256
1257 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1258 rb_erase(&req->r_node, &osdc->requests);
1259 RB_CLEAR_NODE(&req->r_node);
1260 osdc->num_requests--;
1261
1262 if (req->r_osd) {
1263 /* make sure the original request isn't in flight. */
1264 ceph_msg_revoke(req->r_request);
1265
1266 list_del_init(&req->r_osd_item);
1267 maybe_move_osd_to_lru(osdc, req->r_osd);
1268 if (list_empty(&req->r_linger_osd_item))
1269 req->r_osd = NULL;
1270 }
1271
1272 list_del_init(&req->r_req_lru_item);
1273 ceph_osdc_put_request(req);
1274
1275 if (osdc->num_requests == 0) {
1276 dout(" no requests, canceling timeout\n");
1277 __cancel_osd_timeout(osdc);
1278 }
1279 }
1280
1281 /*
1282 * Cancel a previously queued request message
1283 */
1284 static void __cancel_request(struct ceph_osd_request *req)
1285 {
1286 if (req->r_sent && req->r_osd) {
1287 ceph_msg_revoke(req->r_request);
1288 req->r_sent = 0;
1289 }
1290 }
1291
1292 static void __register_linger_request(struct ceph_osd_client *osdc,
1293 struct ceph_osd_request *req)
1294 {
1295 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1296 WARN_ON(!req->r_linger);
1297
1298 ceph_osdc_get_request(req);
1299 list_add_tail(&req->r_linger_item, &osdc->req_linger);
1300 if (req->r_osd)
1301 list_add_tail(&req->r_linger_osd_item,
1302 &req->r_osd->o_linger_requests);
1303 }
1304
1305 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1306 struct ceph_osd_request *req)
1307 {
1308 WARN_ON(!req->r_linger);
1309
1310 if (list_empty(&req->r_linger_item)) {
1311 dout("%s %p tid %llu not registered\n", __func__, req,
1312 req->r_tid);
1313 return;
1314 }
1315
1316 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1317 list_del_init(&req->r_linger_item);
1318
1319 if (req->r_osd) {
1320 list_del_init(&req->r_linger_osd_item);
1321 maybe_move_osd_to_lru(osdc, req->r_osd);
1322 if (list_empty(&req->r_osd_item))
1323 req->r_osd = NULL;
1324 }
1325 ceph_osdc_put_request(req);
1326 }
1327
1328 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1329 struct ceph_osd_request *req)
1330 {
1331 if (!req->r_linger) {
1332 dout("set_request_linger %p\n", req);
1333 req->r_linger = 1;
1334 }
1335 }
1336 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1337
1338 /*
1339 * Returns whether a request should be blocked from being sent
1340 * based on the current osdmap and osd_client settings.
1341 *
1342 * Caller should hold map_sem for read.
1343 */
1344 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1345 struct ceph_osd_request *req)
1346 {
1347 bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1348 bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1349 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1350 return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1351 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1352 }
1353
1354 /*
1355 * Calculate mapping of a request to a PG. Takes tiering into account.
1356 */
1357 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1358 struct ceph_osd_request *req,
1359 struct ceph_pg *pg_out)
1360 {
1361 bool need_check_tiering;
1362
1363 need_check_tiering = false;
1364 if (req->r_target_oloc.pool == -1) {
1365 req->r_target_oloc = req->r_base_oloc; /* struct */
1366 need_check_tiering = true;
1367 }
1368 if (req->r_target_oid.name_len == 0) {
1369 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1370 need_check_tiering = true;
1371 }
1372
1373 if (need_check_tiering &&
1374 (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1375 struct ceph_pg_pool_info *pi;
1376
1377 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1378 if (pi) {
1379 if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1380 pi->read_tier >= 0)
1381 req->r_target_oloc.pool = pi->read_tier;
1382 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1383 pi->write_tier >= 0)
1384 req->r_target_oloc.pool = pi->write_tier;
1385 }
1386 /* !pi is caught in ceph_oloc_oid_to_pg() */
1387 }
1388
1389 return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1390 &req->r_target_oid, pg_out);
1391 }
1392
1393 static void __enqueue_request(struct ceph_osd_request *req)
1394 {
1395 struct ceph_osd_client *osdc = req->r_osdc;
1396
1397 dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1398 req->r_osd ? req->r_osd->o_osd : -1);
1399
1400 if (req->r_osd) {
1401 __remove_osd_from_lru(req->r_osd);
1402 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1403 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1404 } else {
1405 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1406 }
1407 }
1408
1409 /*
1410 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1411 * (as needed), and set the request r_osd appropriately. If there is
1412 * no up osd, set r_osd to NULL. Move the request to the appropriate list
1413 * (unsent, homeless) or leave on in-flight lru.
1414 *
1415 * Return 0 if unchanged, 1 if changed, or negative on error.
1416 *
1417 * Caller should hold map_sem for read and request_mutex.
1418 */
1419 static int __map_request(struct ceph_osd_client *osdc,
1420 struct ceph_osd_request *req, int force_resend)
1421 {
1422 struct ceph_pg pgid;
1423 int acting[CEPH_PG_MAX_SIZE];
1424 int num, o;
1425 int err;
1426 bool was_paused;
1427
1428 dout("map_request %p tid %lld\n", req, req->r_tid);
1429
1430 err = __calc_request_pg(osdc->osdmap, req, &pgid);
1431 if (err) {
1432 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1433 return err;
1434 }
1435 req->r_pgid = pgid;
1436
1437 num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1438 if (num < 0)
1439 num = 0;
1440
1441 was_paused = req->r_paused;
1442 req->r_paused = __req_should_be_paused(osdc, req);
1443 if (was_paused && !req->r_paused)
1444 force_resend = 1;
1445
1446 if ((!force_resend &&
1447 req->r_osd && req->r_osd->o_osd == o &&
1448 req->r_sent >= req->r_osd->o_incarnation &&
1449 req->r_num_pg_osds == num &&
1450 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1451 (req->r_osd == NULL && o == -1) ||
1452 req->r_paused)
1453 return 0; /* no change */
1454
1455 dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1456 req->r_tid, pgid.pool, pgid.seed, o,
1457 req->r_osd ? req->r_osd->o_osd : -1);
1458
1459 /* record full pg acting set */
1460 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1461 req->r_num_pg_osds = num;
1462
1463 if (req->r_osd) {
1464 __cancel_request(req);
1465 list_del_init(&req->r_osd_item);
1466 list_del_init(&req->r_linger_osd_item);
1467 req->r_osd = NULL;
1468 }
1469
1470 req->r_osd = __lookup_osd(osdc, o);
1471 if (!req->r_osd && o >= 0) {
1472 err = -ENOMEM;
1473 req->r_osd = create_osd(osdc, o);
1474 if (!req->r_osd) {
1475 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1476 goto out;
1477 }
1478
1479 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1480 __insert_osd(osdc, req->r_osd);
1481
1482 ceph_con_open(&req->r_osd->o_con,
1483 CEPH_ENTITY_TYPE_OSD, o,
1484 &osdc->osdmap->osd_addr[o]);
1485 }
1486
1487 __enqueue_request(req);
1488 err = 1; /* osd or pg changed */
1489
1490 out:
1491 return err;
1492 }
1493
1494 /*
1495 * caller should hold map_sem (for read) and request_mutex
1496 */
1497 static void __send_request(struct ceph_osd_client *osdc,
1498 struct ceph_osd_request *req)
1499 {
1500 void *p;
1501
1502 dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1503 req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1504 (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1505
1506 /* fill in message content that changes each time we send it */
1507 put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1508 put_unaligned_le32(req->r_flags, req->r_request_flags);
1509 put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1510 p = req->r_request_pgid;
1511 ceph_encode_64(&p, req->r_pgid.pool);
1512 ceph_encode_32(&p, req->r_pgid.seed);
1513 put_unaligned_le64(1, req->r_request_attempts); /* FIXME */
1514 memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1515 sizeof(req->r_reassert_version));
1516
1517 req->r_stamp = jiffies;
1518 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1519
1520 ceph_msg_get(req->r_request); /* send consumes a ref */
1521
1522 req->r_sent = req->r_osd->o_incarnation;
1523
1524 ceph_con_send(&req->r_osd->o_con, req->r_request);
1525 }
1526
1527 /*
1528 * Send any requests in the queue (req_unsent).
1529 */
1530 static void __send_queued(struct ceph_osd_client *osdc)
1531 {
1532 struct ceph_osd_request *req, *tmp;
1533
1534 dout("__send_queued\n");
1535 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1536 __send_request(osdc, req);
1537 }
1538
1539 /*
1540 * Caller should hold map_sem for read and request_mutex.
1541 */
1542 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1543 struct ceph_osd_request *req,
1544 bool nofail)
1545 {
1546 int rc;
1547
1548 __register_request(osdc, req);
1549 req->r_sent = 0;
1550 req->r_got_reply = 0;
1551 rc = __map_request(osdc, req, 0);
1552 if (rc < 0) {
1553 if (nofail) {
1554 dout("osdc_start_request failed map, "
1555 " will retry %lld\n", req->r_tid);
1556 rc = 0;
1557 } else {
1558 __unregister_request(osdc, req);
1559 }
1560 return rc;
1561 }
1562
1563 if (req->r_osd == NULL) {
1564 dout("send_request %p no up osds in pg\n", req);
1565 ceph_monc_request_next_osdmap(&osdc->client->monc);
1566 } else {
1567 __send_queued(osdc);
1568 }
1569
1570 return 0;
1571 }
1572
1573 /*
1574 * Timeout callback, called every N seconds when 1 or more osd
1575 * requests has been active for more than N seconds. When this
1576 * happens, we ping all OSDs with requests who have timed out to
1577 * ensure any communications channel reset is detected. Reset the
1578 * request timeouts another N seconds in the future as we go.
1579 * Reschedule the timeout event another N seconds in future (unless
1580 * there are no open requests).
1581 */
1582 static void handle_timeout(struct work_struct *work)
1583 {
1584 struct ceph_osd_client *osdc =
1585 container_of(work, struct ceph_osd_client, timeout_work.work);
1586 struct ceph_options *opts = osdc->client->options;
1587 struct ceph_osd_request *req;
1588 struct ceph_osd *osd;
1589 struct list_head slow_osds;
1590 dout("timeout\n");
1591 down_read(&osdc->map_sem);
1592
1593 ceph_monc_request_next_osdmap(&osdc->client->monc);
1594
1595 mutex_lock(&osdc->request_mutex);
1596
1597 /*
1598 * ping osds that are a bit slow. this ensures that if there
1599 * is a break in the TCP connection we will notice, and reopen
1600 * a connection with that osd (from the fault callback).
1601 */
1602 INIT_LIST_HEAD(&slow_osds);
1603 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1604 if (time_before(jiffies,
1605 req->r_stamp + opts->osd_keepalive_timeout))
1606 break;
1607
1608 osd = req->r_osd;
1609 BUG_ON(!osd);
1610 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1611 req->r_tid, osd->o_osd);
1612 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1613 }
1614 while (!list_empty(&slow_osds)) {
1615 osd = list_entry(slow_osds.next, struct ceph_osd,
1616 o_keepalive_item);
1617 list_del_init(&osd->o_keepalive_item);
1618 ceph_con_keepalive(&osd->o_con);
1619 }
1620
1621 __schedule_osd_timeout(osdc);
1622 __send_queued(osdc);
1623 mutex_unlock(&osdc->request_mutex);
1624 up_read(&osdc->map_sem);
1625 }
1626
1627 static void handle_osds_timeout(struct work_struct *work)
1628 {
1629 struct ceph_osd_client *osdc =
1630 container_of(work, struct ceph_osd_client,
1631 osds_timeout_work.work);
1632 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
1633
1634 dout("osds timeout\n");
1635 down_read(&osdc->map_sem);
1636 remove_old_osds(osdc);
1637 up_read(&osdc->map_sem);
1638
1639 schedule_delayed_work(&osdc->osds_timeout_work,
1640 round_jiffies_relative(delay));
1641 }
1642
1643 static int ceph_oloc_decode(void **p, void *end,
1644 struct ceph_object_locator *oloc)
1645 {
1646 u8 struct_v, struct_cv;
1647 u32 len;
1648 void *struct_end;
1649 int ret = 0;
1650
1651 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1652 struct_v = ceph_decode_8(p);
1653 struct_cv = ceph_decode_8(p);
1654 if (struct_v < 3) {
1655 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1656 struct_v, struct_cv);
1657 goto e_inval;
1658 }
1659 if (struct_cv > 6) {
1660 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1661 struct_v, struct_cv);
1662 goto e_inval;
1663 }
1664 len = ceph_decode_32(p);
1665 ceph_decode_need(p, end, len, e_inval);
1666 struct_end = *p + len;
1667
1668 oloc->pool = ceph_decode_64(p);
1669 *p += 4; /* skip preferred */
1670
1671 len = ceph_decode_32(p);
1672 if (len > 0) {
1673 pr_warn("ceph_object_locator::key is set\n");
1674 goto e_inval;
1675 }
1676
1677 if (struct_v >= 5) {
1678 len = ceph_decode_32(p);
1679 if (len > 0) {
1680 pr_warn("ceph_object_locator::nspace is set\n");
1681 goto e_inval;
1682 }
1683 }
1684
1685 if (struct_v >= 6) {
1686 s64 hash = ceph_decode_64(p);
1687 if (hash != -1) {
1688 pr_warn("ceph_object_locator::hash is set\n");
1689 goto e_inval;
1690 }
1691 }
1692
1693 /* skip the rest */
1694 *p = struct_end;
1695 out:
1696 return ret;
1697
1698 e_inval:
1699 ret = -EINVAL;
1700 goto out;
1701 }
1702
1703 static int ceph_redirect_decode(void **p, void *end,
1704 struct ceph_request_redirect *redir)
1705 {
1706 u8 struct_v, struct_cv;
1707 u32 len;
1708 void *struct_end;
1709 int ret;
1710
1711 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1712 struct_v = ceph_decode_8(p);
1713 struct_cv = ceph_decode_8(p);
1714 if (struct_cv > 1) {
1715 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1716 struct_v, struct_cv);
1717 goto e_inval;
1718 }
1719 len = ceph_decode_32(p);
1720 ceph_decode_need(p, end, len, e_inval);
1721 struct_end = *p + len;
1722
1723 ret = ceph_oloc_decode(p, end, &redir->oloc);
1724 if (ret)
1725 goto out;
1726
1727 len = ceph_decode_32(p);
1728 if (len > 0) {
1729 pr_warn("ceph_request_redirect::object_name is set\n");
1730 goto e_inval;
1731 }
1732
1733 len = ceph_decode_32(p);
1734 *p += len; /* skip osd_instructions */
1735
1736 /* skip the rest */
1737 *p = struct_end;
1738 out:
1739 return ret;
1740
1741 e_inval:
1742 ret = -EINVAL;
1743 goto out;
1744 }
1745
1746 static void complete_request(struct ceph_osd_request *req)
1747 {
1748 complete_all(&req->r_safe_completion); /* fsync waiter */
1749 }
1750
1751 /*
1752 * handle osd op reply. either call the callback if it is specified,
1753 * or do the completion to wake up the waiting thread.
1754 */
1755 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1756 {
1757 void *p, *end;
1758 struct ceph_osd_request *req;
1759 struct ceph_request_redirect redir;
1760 u64 tid;
1761 int object_len;
1762 unsigned int numops;
1763 int payload_len, flags;
1764 s32 result;
1765 s32 retry_attempt;
1766 struct ceph_pg pg;
1767 int err;
1768 u32 reassert_epoch;
1769 u64 reassert_version;
1770 u32 osdmap_epoch;
1771 int already_completed;
1772 u32 bytes;
1773 u8 decode_redir;
1774 unsigned int i;
1775
1776 tid = le64_to_cpu(msg->hdr.tid);
1777 dout("handle_reply %p tid %llu\n", msg, tid);
1778
1779 p = msg->front.iov_base;
1780 end = p + msg->front.iov_len;
1781
1782 ceph_decode_need(&p, end, 4, bad);
1783 object_len = ceph_decode_32(&p);
1784 ceph_decode_need(&p, end, object_len, bad);
1785 p += object_len;
1786
1787 err = ceph_decode_pgid(&p, end, &pg);
1788 if (err)
1789 goto bad;
1790
1791 ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1792 flags = ceph_decode_64(&p);
1793 result = ceph_decode_32(&p);
1794 reassert_epoch = ceph_decode_32(&p);
1795 reassert_version = ceph_decode_64(&p);
1796 osdmap_epoch = ceph_decode_32(&p);
1797
1798 /* lookup */
1799 down_read(&osdc->map_sem);
1800 mutex_lock(&osdc->request_mutex);
1801 req = __lookup_request(osdc, tid);
1802 if (req == NULL) {
1803 dout("handle_reply tid %llu dne\n", tid);
1804 goto bad_mutex;
1805 }
1806 ceph_osdc_get_request(req);
1807
1808 dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1809 req, result);
1810
1811 ceph_decode_need(&p, end, 4, bad_put);
1812 numops = ceph_decode_32(&p);
1813 if (numops > CEPH_OSD_MAX_OP)
1814 goto bad_put;
1815 if (numops != req->r_num_ops)
1816 goto bad_put;
1817 payload_len = 0;
1818 ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1819 for (i = 0; i < numops; i++) {
1820 struct ceph_osd_op *op = p;
1821 int len;
1822
1823 len = le32_to_cpu(op->payload_len);
1824 req->r_reply_op_len[i] = len;
1825 dout(" op %d has %d bytes\n", i, len);
1826 payload_len += len;
1827 p += sizeof(*op);
1828 }
1829 bytes = le32_to_cpu(msg->hdr.data_len);
1830 if (payload_len != bytes) {
1831 pr_warn("sum of op payload lens %d != data_len %d\n",
1832 payload_len, bytes);
1833 goto bad_put;
1834 }
1835
1836 ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1837 retry_attempt = ceph_decode_32(&p);
1838 for (i = 0; i < numops; i++)
1839 req->r_reply_op_result[i] = ceph_decode_32(&p);
1840
1841 if (le16_to_cpu(msg->hdr.version) >= 6) {
1842 p += 8 + 4; /* skip replay_version */
1843 p += 8; /* skip user_version */
1844
1845 if (le16_to_cpu(msg->hdr.version) >= 7)
1846 ceph_decode_8_safe(&p, end, decode_redir, bad_put);
1847 else
1848 decode_redir = 1;
1849 } else {
1850 decode_redir = 0;
1851 }
1852
1853 if (decode_redir) {
1854 err = ceph_redirect_decode(&p, end, &redir);
1855 if (err)
1856 goto bad_put;
1857 } else {
1858 redir.oloc.pool = -1;
1859 }
1860
1861 if (redir.oloc.pool != -1) {
1862 dout("redirect pool %lld\n", redir.oloc.pool);
1863
1864 __unregister_request(osdc, req);
1865
1866 req->r_target_oloc = redir.oloc; /* struct */
1867
1868 /*
1869 * Start redirect requests with nofail=true. If
1870 * mapping fails, request will end up on the notarget
1871 * list, waiting for the new osdmap (which can take
1872 * a while), even though the original request mapped
1873 * successfully. In the future we might want to follow
1874 * original request's nofail setting here.
1875 */
1876 err = __ceph_osdc_start_request(osdc, req, true);
1877 BUG_ON(err);
1878
1879 goto out_unlock;
1880 }
1881
1882 already_completed = req->r_got_reply;
1883 if (!req->r_got_reply) {
1884 req->r_result = result;
1885 dout("handle_reply result %d bytes %d\n", req->r_result,
1886 bytes);
1887 if (req->r_result == 0)
1888 req->r_result = bytes;
1889
1890 /* in case this is a write and we need to replay, */
1891 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1892 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1893
1894 req->r_got_reply = 1;
1895 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1896 dout("handle_reply tid %llu dup ack\n", tid);
1897 goto out_unlock;
1898 }
1899
1900 dout("handle_reply tid %llu flags %d\n", tid, flags);
1901
1902 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1903 __register_linger_request(osdc, req);
1904
1905 /* either this is a read, or we got the safe response */
1906 if (result < 0 ||
1907 (flags & CEPH_OSD_FLAG_ONDISK) ||
1908 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1909 __unregister_request(osdc, req);
1910
1911 mutex_unlock(&osdc->request_mutex);
1912 up_read(&osdc->map_sem);
1913
1914 if (!already_completed) {
1915 if (req->r_unsafe_callback &&
1916 result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1917 req->r_unsafe_callback(req, true);
1918 if (req->r_callback)
1919 req->r_callback(req, msg);
1920 else
1921 complete_all(&req->r_completion);
1922 }
1923
1924 if (flags & CEPH_OSD_FLAG_ONDISK) {
1925 if (req->r_unsafe_callback && already_completed)
1926 req->r_unsafe_callback(req, false);
1927 complete_request(req);
1928 }
1929
1930 out:
1931 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1932 ceph_osdc_put_request(req);
1933 return;
1934 out_unlock:
1935 mutex_unlock(&osdc->request_mutex);
1936 up_read(&osdc->map_sem);
1937 goto out;
1938
1939 bad_put:
1940 req->r_result = -EIO;
1941 __unregister_request(osdc, req);
1942 if (req->r_callback)
1943 req->r_callback(req, msg);
1944 else
1945 complete_all(&req->r_completion);
1946 complete_request(req);
1947 ceph_osdc_put_request(req);
1948 bad_mutex:
1949 mutex_unlock(&osdc->request_mutex);
1950 up_read(&osdc->map_sem);
1951 bad:
1952 pr_err("corrupt osd_op_reply got %d %d\n",
1953 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1954 ceph_msg_dump(msg);
1955 }
1956
1957 static void reset_changed_osds(struct ceph_osd_client *osdc)
1958 {
1959 struct rb_node *p, *n;
1960
1961 dout("%s %p\n", __func__, osdc);
1962 for (p = rb_first(&osdc->osds); p; p = n) {
1963 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1964
1965 n = rb_next(p);
1966 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1967 memcmp(&osd->o_con.peer_addr,
1968 ceph_osd_addr(osdc->osdmap,
1969 osd->o_osd),
1970 sizeof(struct ceph_entity_addr)) != 0)
1971 __reset_osd(osdc, osd);
1972 }
1973 }
1974
1975 /*
1976 * Requeue requests whose mapping to an OSD has changed. If requests map to
1977 * no osd, request a new map.
1978 *
1979 * Caller should hold map_sem for read.
1980 */
1981 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1982 bool force_resend_writes)
1983 {
1984 struct ceph_osd_request *req, *nreq;
1985 struct rb_node *p;
1986 int needmap = 0;
1987 int err;
1988 bool force_resend_req;
1989
1990 dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1991 force_resend_writes ? " (force resend writes)" : "");
1992 mutex_lock(&osdc->request_mutex);
1993 for (p = rb_first(&osdc->requests); p; ) {
1994 req = rb_entry(p, struct ceph_osd_request, r_node);
1995 p = rb_next(p);
1996
1997 /*
1998 * For linger requests that have not yet been
1999 * registered, move them to the linger list; they'll
2000 * be sent to the osd in the loop below. Unregister
2001 * the request before re-registering it as a linger
2002 * request to ensure the __map_request() below
2003 * will decide it needs to be sent.
2004 */
2005 if (req->r_linger && list_empty(&req->r_linger_item)) {
2006 dout("%p tid %llu restart on osd%d\n",
2007 req, req->r_tid,
2008 req->r_osd ? req->r_osd->o_osd : -1);
2009 ceph_osdc_get_request(req);
2010 __unregister_request(osdc, req);
2011 __register_linger_request(osdc, req);
2012 ceph_osdc_put_request(req);
2013 continue;
2014 }
2015
2016 force_resend_req = force_resend ||
2017 (force_resend_writes &&
2018 req->r_flags & CEPH_OSD_FLAG_WRITE);
2019 err = __map_request(osdc, req, force_resend_req);
2020 if (err < 0)
2021 continue; /* error */
2022 if (req->r_osd == NULL) {
2023 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2024 needmap++; /* request a newer map */
2025 } else if (err > 0) {
2026 if (!req->r_linger) {
2027 dout("%p tid %llu requeued on osd%d\n", req,
2028 req->r_tid,
2029 req->r_osd ? req->r_osd->o_osd : -1);
2030 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2031 }
2032 }
2033 }
2034
2035 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2036 r_linger_item) {
2037 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2038
2039 err = __map_request(osdc, req,
2040 force_resend || force_resend_writes);
2041 dout("__map_request returned %d\n", err);
2042 if (err < 0)
2043 continue; /* hrm! */
2044 if (req->r_osd == NULL || err > 0) {
2045 if (req->r_osd == NULL) {
2046 dout("lingering %p tid %llu maps to no osd\n",
2047 req, req->r_tid);
2048 /*
2049 * A homeless lingering request makes
2050 * no sense, as it's job is to keep
2051 * a particular OSD connection open.
2052 * Request a newer map and kick the
2053 * request, knowing that it won't be
2054 * resent until we actually get a map
2055 * that can tell us where to send it.
2056 */
2057 needmap++;
2058 }
2059
2060 dout("kicking lingering %p tid %llu osd%d\n", req,
2061 req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2062 __register_request(osdc, req);
2063 __unregister_linger_request(osdc, req);
2064 }
2065 }
2066 reset_changed_osds(osdc);
2067 mutex_unlock(&osdc->request_mutex);
2068
2069 if (needmap) {
2070 dout("%d requests for down osds, need new map\n", needmap);
2071 ceph_monc_request_next_osdmap(&osdc->client->monc);
2072 }
2073 }
2074
2075
2076 /*
2077 * Process updated osd map.
2078 *
2079 * The message contains any number of incremental and full maps, normally
2080 * indicating some sort of topology change in the cluster. Kick requests
2081 * off to different OSDs as needed.
2082 */
2083 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2084 {
2085 void *p, *end, *next;
2086 u32 nr_maps, maplen;
2087 u32 epoch;
2088 struct ceph_osdmap *newmap = NULL, *oldmap;
2089 int err;
2090 struct ceph_fsid fsid;
2091 bool was_full;
2092
2093 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2094 p = msg->front.iov_base;
2095 end = p + msg->front.iov_len;
2096
2097 /* verify fsid */
2098 ceph_decode_need(&p, end, sizeof(fsid), bad);
2099 ceph_decode_copy(&p, &fsid, sizeof(fsid));
2100 if (ceph_check_fsid(osdc->client, &fsid) < 0)
2101 return;
2102
2103 down_write(&osdc->map_sem);
2104
2105 was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2106
2107 /* incremental maps */
2108 ceph_decode_32_safe(&p, end, nr_maps, bad);
2109 dout(" %d inc maps\n", nr_maps);
2110 while (nr_maps > 0) {
2111 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2112 epoch = ceph_decode_32(&p);
2113 maplen = ceph_decode_32(&p);
2114 ceph_decode_need(&p, end, maplen, bad);
2115 next = p + maplen;
2116 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2117 dout("applying incremental map %u len %d\n",
2118 epoch, maplen);
2119 newmap = osdmap_apply_incremental(&p, next,
2120 osdc->osdmap,
2121 &osdc->client->msgr);
2122 if (IS_ERR(newmap)) {
2123 err = PTR_ERR(newmap);
2124 goto bad;
2125 }
2126 BUG_ON(!newmap);
2127 if (newmap != osdc->osdmap) {
2128 ceph_osdmap_destroy(osdc->osdmap);
2129 osdc->osdmap = newmap;
2130 }
2131 was_full = was_full ||
2132 ceph_osdmap_flag(osdc->osdmap,
2133 CEPH_OSDMAP_FULL);
2134 kick_requests(osdc, 0, was_full);
2135 } else {
2136 dout("ignoring incremental map %u len %d\n",
2137 epoch, maplen);
2138 }
2139 p = next;
2140 nr_maps--;
2141 }
2142 if (newmap)
2143 goto done;
2144
2145 /* full maps */
2146 ceph_decode_32_safe(&p, end, nr_maps, bad);
2147 dout(" %d full maps\n", nr_maps);
2148 while (nr_maps) {
2149 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2150 epoch = ceph_decode_32(&p);
2151 maplen = ceph_decode_32(&p);
2152 ceph_decode_need(&p, end, maplen, bad);
2153 if (nr_maps > 1) {
2154 dout("skipping non-latest full map %u len %d\n",
2155 epoch, maplen);
2156 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2157 dout("skipping full map %u len %d, "
2158 "older than our %u\n", epoch, maplen,
2159 osdc->osdmap->epoch);
2160 } else {
2161 int skipped_map = 0;
2162
2163 dout("taking full map %u len %d\n", epoch, maplen);
2164 newmap = ceph_osdmap_decode(&p, p+maplen);
2165 if (IS_ERR(newmap)) {
2166 err = PTR_ERR(newmap);
2167 goto bad;
2168 }
2169 BUG_ON(!newmap);
2170 oldmap = osdc->osdmap;
2171 osdc->osdmap = newmap;
2172 if (oldmap) {
2173 if (oldmap->epoch + 1 < newmap->epoch)
2174 skipped_map = 1;
2175 ceph_osdmap_destroy(oldmap);
2176 }
2177 was_full = was_full ||
2178 ceph_osdmap_flag(osdc->osdmap,
2179 CEPH_OSDMAP_FULL);
2180 kick_requests(osdc, skipped_map, was_full);
2181 }
2182 p += maplen;
2183 nr_maps--;
2184 }
2185
2186 if (!osdc->osdmap)
2187 goto bad;
2188 done:
2189 downgrade_write(&osdc->map_sem);
2190 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2191
2192 /*
2193 * subscribe to subsequent osdmap updates if full to ensure
2194 * we find out when we are no longer full and stop returning
2195 * ENOSPC.
2196 */
2197 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2198 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2199 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2200 ceph_monc_request_next_osdmap(&osdc->client->monc);
2201
2202 mutex_lock(&osdc->request_mutex);
2203 __send_queued(osdc);
2204 mutex_unlock(&osdc->request_mutex);
2205 up_read(&osdc->map_sem);
2206 wake_up_all(&osdc->client->auth_wq);
2207 return;
2208
2209 bad:
2210 pr_err("osdc handle_map corrupt msg\n");
2211 ceph_msg_dump(msg);
2212 up_write(&osdc->map_sem);
2213 }
2214
2215 /*
2216 * watch/notify callback event infrastructure
2217 *
2218 * These callbacks are used both for watch and notify operations.
2219 */
2220 static void __release_event(struct kref *kref)
2221 {
2222 struct ceph_osd_event *event =
2223 container_of(kref, struct ceph_osd_event, kref);
2224
2225 dout("__release_event %p\n", event);
2226 kfree(event);
2227 }
2228
2229 static void get_event(struct ceph_osd_event *event)
2230 {
2231 kref_get(&event->kref);
2232 }
2233
2234 void ceph_osdc_put_event(struct ceph_osd_event *event)
2235 {
2236 kref_put(&event->kref, __release_event);
2237 }
2238 EXPORT_SYMBOL(ceph_osdc_put_event);
2239
2240 static void __insert_event(struct ceph_osd_client *osdc,
2241 struct ceph_osd_event *new)
2242 {
2243 struct rb_node **p = &osdc->event_tree.rb_node;
2244 struct rb_node *parent = NULL;
2245 struct ceph_osd_event *event = NULL;
2246
2247 while (*p) {
2248 parent = *p;
2249 event = rb_entry(parent, struct ceph_osd_event, node);
2250 if (new->cookie < event->cookie)
2251 p = &(*p)->rb_left;
2252 else if (new->cookie > event->cookie)
2253 p = &(*p)->rb_right;
2254 else
2255 BUG();
2256 }
2257
2258 rb_link_node(&new->node, parent, p);
2259 rb_insert_color(&new->node, &osdc->event_tree);
2260 }
2261
2262 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2263 u64 cookie)
2264 {
2265 struct rb_node **p = &osdc->event_tree.rb_node;
2266 struct rb_node *parent = NULL;
2267 struct ceph_osd_event *event = NULL;
2268
2269 while (*p) {
2270 parent = *p;
2271 event = rb_entry(parent, struct ceph_osd_event, node);
2272 if (cookie < event->cookie)
2273 p = &(*p)->rb_left;
2274 else if (cookie > event->cookie)
2275 p = &(*p)->rb_right;
2276 else
2277 return event;
2278 }
2279 return NULL;
2280 }
2281
2282 static void __remove_event(struct ceph_osd_event *event)
2283 {
2284 struct ceph_osd_client *osdc = event->osdc;
2285
2286 if (!RB_EMPTY_NODE(&event->node)) {
2287 dout("__remove_event removed %p\n", event);
2288 rb_erase(&event->node, &osdc->event_tree);
2289 ceph_osdc_put_event(event);
2290 } else {
2291 dout("__remove_event didn't remove %p\n", event);
2292 }
2293 }
2294
2295 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2296 void (*event_cb)(u64, u64, u8, void *),
2297 void *data, struct ceph_osd_event **pevent)
2298 {
2299 struct ceph_osd_event *event;
2300
2301 event = kmalloc(sizeof(*event), GFP_NOIO);
2302 if (!event)
2303 return -ENOMEM;
2304
2305 dout("create_event %p\n", event);
2306 event->cb = event_cb;
2307 event->one_shot = 0;
2308 event->data = data;
2309 event->osdc = osdc;
2310 INIT_LIST_HEAD(&event->osd_node);
2311 RB_CLEAR_NODE(&event->node);
2312 kref_init(&event->kref); /* one ref for us */
2313 kref_get(&event->kref); /* one ref for the caller */
2314
2315 spin_lock(&osdc->event_lock);
2316 event->cookie = ++osdc->event_count;
2317 __insert_event(osdc, event);
2318 spin_unlock(&osdc->event_lock);
2319
2320 *pevent = event;
2321 return 0;
2322 }
2323 EXPORT_SYMBOL(ceph_osdc_create_event);
2324
2325 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2326 {
2327 struct ceph_osd_client *osdc = event->osdc;
2328
2329 dout("cancel_event %p\n", event);
2330 spin_lock(&osdc->event_lock);
2331 __remove_event(event);
2332 spin_unlock(&osdc->event_lock);
2333 ceph_osdc_put_event(event); /* caller's */
2334 }
2335 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2336
2337
2338 static void do_event_work(struct work_struct *work)
2339 {
2340 struct ceph_osd_event_work *event_work =
2341 container_of(work, struct ceph_osd_event_work, work);
2342 struct ceph_osd_event *event = event_work->event;
2343 u64 ver = event_work->ver;
2344 u64 notify_id = event_work->notify_id;
2345 u8 opcode = event_work->opcode;
2346
2347 dout("do_event_work completing %p\n", event);
2348 event->cb(ver, notify_id, opcode, event->data);
2349 dout("do_event_work completed %p\n", event);
2350 ceph_osdc_put_event(event);
2351 kfree(event_work);
2352 }
2353
2354
2355 /*
2356 * Process osd watch notifications
2357 */
2358 static void handle_watch_notify(struct ceph_osd_client *osdc,
2359 struct ceph_msg *msg)
2360 {
2361 void *p, *end;
2362 u8 proto_ver;
2363 u64 cookie, ver, notify_id;
2364 u8 opcode;
2365 struct ceph_osd_event *event;
2366 struct ceph_osd_event_work *event_work;
2367
2368 p = msg->front.iov_base;
2369 end = p + msg->front.iov_len;
2370
2371 ceph_decode_8_safe(&p, end, proto_ver, bad);
2372 ceph_decode_8_safe(&p, end, opcode, bad);
2373 ceph_decode_64_safe(&p, end, cookie, bad);
2374 ceph_decode_64_safe(&p, end, ver, bad);
2375 ceph_decode_64_safe(&p, end, notify_id, bad);
2376
2377 spin_lock(&osdc->event_lock);
2378 event = __find_event(osdc, cookie);
2379 if (event) {
2380 BUG_ON(event->one_shot);
2381 get_event(event);
2382 }
2383 spin_unlock(&osdc->event_lock);
2384 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2385 cookie, ver, event);
2386 if (event) {
2387 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2388 if (!event_work) {
2389 pr_err("couldn't allocate event_work\n");
2390 ceph_osdc_put_event(event);
2391 return;
2392 }
2393 INIT_WORK(&event_work->work, do_event_work);
2394 event_work->event = event;
2395 event_work->ver = ver;
2396 event_work->notify_id = notify_id;
2397 event_work->opcode = opcode;
2398
2399 queue_work(osdc->notify_wq, &event_work->work);
2400 }
2401
2402 return;
2403
2404 bad:
2405 pr_err("osdc handle_watch_notify corrupt msg\n");
2406 }
2407
2408 /*
2409 * build new request AND message
2410 *
2411 */
2412 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2413 struct ceph_snap_context *snapc, u64 snap_id,
2414 struct timespec *mtime)
2415 {
2416 struct ceph_msg *msg = req->r_request;
2417 void *p;
2418 size_t msg_size;
2419 int flags = req->r_flags;
2420 u64 data_len;
2421 unsigned int i;
2422
2423 req->r_snapid = snap_id;
2424 req->r_snapc = ceph_get_snap_context(snapc);
2425
2426 /* encode request */
2427 msg->hdr.version = cpu_to_le16(4);
2428
2429 p = msg->front.iov_base;
2430 ceph_encode_32(&p, 1); /* client_inc is always 1 */
2431 req->r_request_osdmap_epoch = p;
2432 p += 4;
2433 req->r_request_flags = p;
2434 p += 4;
2435 if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2436 ceph_encode_timespec(p, mtime);
2437 p += sizeof(struct ceph_timespec);
2438 req->r_request_reassert_version = p;
2439 p += sizeof(struct ceph_eversion); /* will get filled in */
2440
2441 /* oloc */
2442 ceph_encode_8(&p, 4);
2443 ceph_encode_8(&p, 4);
2444 ceph_encode_32(&p, 8 + 4 + 4);
2445 req->r_request_pool = p;
2446 p += 8;
2447 ceph_encode_32(&p, -1); /* preferred */
2448 ceph_encode_32(&p, 0); /* key len */
2449
2450 ceph_encode_8(&p, 1);
2451 req->r_request_pgid = p;
2452 p += 8 + 4;
2453 ceph_encode_32(&p, -1); /* preferred */
2454
2455 /* oid */
2456 ceph_encode_32(&p, req->r_base_oid.name_len);
2457 memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2458 dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2459 req->r_base_oid.name, req->r_base_oid.name_len);
2460 p += req->r_base_oid.name_len;
2461
2462 /* ops--can imply data */
2463 ceph_encode_16(&p, (u16)req->r_num_ops);
2464 data_len = 0;
2465 for (i = 0; i < req->r_num_ops; i++) {
2466 data_len += osd_req_encode_op(req, p, i);
2467 p += sizeof(struct ceph_osd_op);
2468 }
2469
2470 /* snaps */
2471 ceph_encode_64(&p, req->r_snapid);
2472 ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2473 ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2474 if (req->r_snapc) {
2475 for (i = 0; i < snapc->num_snaps; i++) {
2476 ceph_encode_64(&p, req->r_snapc->snaps[i]);
2477 }
2478 }
2479
2480 req->r_request_attempts = p;
2481 p += 4;
2482
2483 /* data */
2484 if (flags & CEPH_OSD_FLAG_WRITE) {
2485 u16 data_off;
2486
2487 /*
2488 * The header "data_off" is a hint to the receiver
2489 * allowing it to align received data into its
2490 * buffers such that there's no need to re-copy
2491 * it before writing it to disk (direct I/O).
2492 */
2493 data_off = (u16) (off & 0xffff);
2494 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2495 }
2496 req->r_request->hdr.data_len = cpu_to_le32(data_len);
2497
2498 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2499 msg_size = p - msg->front.iov_base;
2500 msg->front.iov_len = msg_size;
2501 msg->hdr.front_len = cpu_to_le32(msg_size);
2502
2503 dout("build_request msg_size was %d\n", (int)msg_size);
2504 }
2505 EXPORT_SYMBOL(ceph_osdc_build_request);
2506
2507 /*
2508 * Register request, send initial attempt.
2509 */
2510 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2511 struct ceph_osd_request *req,
2512 bool nofail)
2513 {
2514 int rc;
2515
2516 down_read(&osdc->map_sem);
2517 mutex_lock(&osdc->request_mutex);
2518
2519 rc = __ceph_osdc_start_request(osdc, req, nofail);
2520
2521 mutex_unlock(&osdc->request_mutex);
2522 up_read(&osdc->map_sem);
2523
2524 return rc;
2525 }
2526 EXPORT_SYMBOL(ceph_osdc_start_request);
2527
2528 /*
2529 * Unregister a registered request. The request is not completed (i.e.
2530 * no callbacks or wakeups) - higher layers are supposed to know what
2531 * they are canceling.
2532 */
2533 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2534 {
2535 struct ceph_osd_client *osdc = req->r_osdc;
2536
2537 mutex_lock(&osdc->request_mutex);
2538 if (req->r_linger)
2539 __unregister_linger_request(osdc, req);
2540 __unregister_request(osdc, req);
2541 mutex_unlock(&osdc->request_mutex);
2542
2543 dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2544 }
2545 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2546
2547 /*
2548 * wait for a request to complete
2549 */
2550 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2551 struct ceph_osd_request *req)
2552 {
2553 int rc;
2554
2555 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2556
2557 rc = wait_for_completion_interruptible(&req->r_completion);
2558 if (rc < 0) {
2559 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2560 ceph_osdc_cancel_request(req);
2561 complete_request(req);
2562 return rc;
2563 }
2564
2565 dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2566 req->r_result);
2567 return req->r_result;
2568 }
2569 EXPORT_SYMBOL(ceph_osdc_wait_request);
2570
2571 /*
2572 * sync - wait for all in-flight requests to flush. avoid starvation.
2573 */
2574 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2575 {
2576 struct ceph_osd_request *req;
2577 u64 last_tid, next_tid = 0;
2578
2579 mutex_lock(&osdc->request_mutex);
2580 last_tid = osdc->last_tid;
2581 while (1) {
2582 req = __lookup_request_ge(osdc, next_tid);
2583 if (!req)
2584 break;
2585 if (req->r_tid > last_tid)
2586 break;
2587
2588 next_tid = req->r_tid + 1;
2589 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2590 continue;
2591
2592 ceph_osdc_get_request(req);
2593 mutex_unlock(&osdc->request_mutex);
2594 dout("sync waiting on tid %llu (last is %llu)\n",
2595 req->r_tid, last_tid);
2596 wait_for_completion(&req->r_safe_completion);
2597 mutex_lock(&osdc->request_mutex);
2598 ceph_osdc_put_request(req);
2599 }
2600 mutex_unlock(&osdc->request_mutex);
2601 dout("sync done (thru tid %llu)\n", last_tid);
2602 }
2603 EXPORT_SYMBOL(ceph_osdc_sync);
2604
2605 /*
2606 * Call all pending notify callbacks - for use after a watch is
2607 * unregistered, to make sure no more callbacks for it will be invoked
2608 */
2609 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2610 {
2611 flush_workqueue(osdc->notify_wq);
2612 }
2613 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2614
2615
2616 /*
2617 * init, shutdown
2618 */
2619 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2620 {
2621 int err;
2622
2623 dout("init\n");
2624 osdc->client = client;
2625 osdc->osdmap = NULL;
2626 init_rwsem(&osdc->map_sem);
2627 init_completion(&osdc->map_waiters);
2628 osdc->last_requested_map = 0;
2629 mutex_init(&osdc->request_mutex);
2630 osdc->last_tid = 0;
2631 osdc->osds = RB_ROOT;
2632 INIT_LIST_HEAD(&osdc->osd_lru);
2633 osdc->requests = RB_ROOT;
2634 INIT_LIST_HEAD(&osdc->req_lru);
2635 INIT_LIST_HEAD(&osdc->req_unsent);
2636 INIT_LIST_HEAD(&osdc->req_notarget);
2637 INIT_LIST_HEAD(&osdc->req_linger);
2638 osdc->num_requests = 0;
2639 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2640 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2641 spin_lock_init(&osdc->event_lock);
2642 osdc->event_tree = RB_ROOT;
2643 osdc->event_count = 0;
2644
2645 schedule_delayed_work(&osdc->osds_timeout_work,
2646 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
2647
2648 err = -ENOMEM;
2649 osdc->req_mempool = mempool_create_kmalloc_pool(10,
2650 sizeof(struct ceph_osd_request));
2651 if (!osdc->req_mempool)
2652 goto out;
2653
2654 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2655 OSD_OP_FRONT_LEN, 10, true,
2656 "osd_op");
2657 if (err < 0)
2658 goto out_mempool;
2659 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2660 OSD_OPREPLY_FRONT_LEN, 10, true,
2661 "osd_op_reply");
2662 if (err < 0)
2663 goto out_msgpool;
2664
2665 err = -ENOMEM;
2666 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2667 if (!osdc->notify_wq)
2668 goto out_msgpool_reply;
2669
2670 return 0;
2671
2672 out_msgpool_reply:
2673 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2674 out_msgpool:
2675 ceph_msgpool_destroy(&osdc->msgpool_op);
2676 out_mempool:
2677 mempool_destroy(osdc->req_mempool);
2678 out:
2679 return err;
2680 }
2681
2682 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2683 {
2684 flush_workqueue(osdc->notify_wq);
2685 destroy_workqueue(osdc->notify_wq);
2686 cancel_delayed_work_sync(&osdc->timeout_work);
2687 cancel_delayed_work_sync(&osdc->osds_timeout_work);
2688 if (osdc->osdmap) {
2689 ceph_osdmap_destroy(osdc->osdmap);
2690 osdc->osdmap = NULL;
2691 }
2692 remove_all_osds(osdc);
2693 mempool_destroy(osdc->req_mempool);
2694 ceph_msgpool_destroy(&osdc->msgpool_op);
2695 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2696 }
2697
2698 /*
2699 * Read some contiguous pages. If we cross a stripe boundary, shorten
2700 * *plen. Return number of bytes read, or error.
2701 */
2702 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2703 struct ceph_vino vino, struct ceph_file_layout *layout,
2704 u64 off, u64 *plen,
2705 u32 truncate_seq, u64 truncate_size,
2706 struct page **pages, int num_pages, int page_align)
2707 {
2708 struct ceph_osd_request *req;
2709 int rc = 0;
2710
2711 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2712 vino.snap, off, *plen);
2713 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2714 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2715 NULL, truncate_seq, truncate_size,
2716 false);
2717 if (IS_ERR(req))
2718 return PTR_ERR(req);
2719
2720 /* it may be a short read due to an object boundary */
2721
2722 osd_req_op_extent_osd_data_pages(req, 0,
2723 pages, *plen, page_align, false, false);
2724
2725 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
2726 off, *plen, *plen, page_align);
2727
2728 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2729
2730 rc = ceph_osdc_start_request(osdc, req, false);
2731 if (!rc)
2732 rc = ceph_osdc_wait_request(osdc, req);
2733
2734 ceph_osdc_put_request(req);
2735 dout("readpages result %d\n", rc);
2736 return rc;
2737 }
2738 EXPORT_SYMBOL(ceph_osdc_readpages);
2739
2740 /*
2741 * do a synchronous write on N pages
2742 */
2743 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2744 struct ceph_file_layout *layout,
2745 struct ceph_snap_context *snapc,
2746 u64 off, u64 len,
2747 u32 truncate_seq, u64 truncate_size,
2748 struct timespec *mtime,
2749 struct page **pages, int num_pages)
2750 {
2751 struct ceph_osd_request *req;
2752 int rc = 0;
2753 int page_align = off & ~PAGE_MASK;
2754
2755 BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */
2756 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2757 CEPH_OSD_OP_WRITE,
2758 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2759 snapc, truncate_seq, truncate_size,
2760 true);
2761 if (IS_ERR(req))
2762 return PTR_ERR(req);
2763
2764 /* it may be a short write due to an object boundary */
2765 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2766 false, false);
2767 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2768
2769 ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2770
2771 rc = ceph_osdc_start_request(osdc, req, true);
2772 if (!rc)
2773 rc = ceph_osdc_wait_request(osdc, req);
2774
2775 ceph_osdc_put_request(req);
2776 if (rc == 0)
2777 rc = len;
2778 dout("writepages result %d\n", rc);
2779 return rc;
2780 }
2781 EXPORT_SYMBOL(ceph_osdc_writepages);
2782
2783 int ceph_osdc_setup(void)
2784 {
2785 BUG_ON(ceph_osd_request_cache);
2786 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2787 sizeof (struct ceph_osd_request),
2788 __alignof__(struct ceph_osd_request),
2789 0, NULL);
2790
2791 return ceph_osd_request_cache ? 0 : -ENOMEM;
2792 }
2793 EXPORT_SYMBOL(ceph_osdc_setup);
2794
2795 void ceph_osdc_cleanup(void)
2796 {
2797 BUG_ON(!ceph_osd_request_cache);
2798 kmem_cache_destroy(ceph_osd_request_cache);
2799 ceph_osd_request_cache = NULL;
2800 }
2801 EXPORT_SYMBOL(ceph_osdc_cleanup);
2802
2803 /*
2804 * handle incoming message
2805 */
2806 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2807 {
2808 struct ceph_osd *osd = con->private;
2809 struct ceph_osd_client *osdc;
2810 int type = le16_to_cpu(msg->hdr.type);
2811
2812 if (!osd)
2813 goto out;
2814 osdc = osd->o_osdc;
2815
2816 switch (type) {
2817 case CEPH_MSG_OSD_MAP:
2818 ceph_osdc_handle_map(osdc, msg);
2819 break;
2820 case CEPH_MSG_OSD_OPREPLY:
2821 handle_reply(osdc, msg);
2822 break;
2823 case CEPH_MSG_WATCH_NOTIFY:
2824 handle_watch_notify(osdc, msg);
2825 break;
2826
2827 default:
2828 pr_err("received unknown message type %d %s\n", type,
2829 ceph_msg_type_name(type));
2830 }
2831 out:
2832 ceph_msg_put(msg);
2833 }
2834
2835 /*
2836 * Lookup and return message for incoming reply. Don't try to do
2837 * anything about a larger than preallocated data portion of the
2838 * message at the moment - for now, just skip the message.
2839 */
2840 static struct ceph_msg *get_reply(struct ceph_connection *con,
2841 struct ceph_msg_header *hdr,
2842 int *skip)
2843 {
2844 struct ceph_osd *osd = con->private;
2845 struct ceph_osd_client *osdc = osd->o_osdc;
2846 struct ceph_msg *m;
2847 struct ceph_osd_request *req;
2848 int front_len = le32_to_cpu(hdr->front_len);
2849 int data_len = le32_to_cpu(hdr->data_len);
2850 u64 tid;
2851
2852 tid = le64_to_cpu(hdr->tid);
2853 mutex_lock(&osdc->request_mutex);
2854 req = __lookup_request(osdc, tid);
2855 if (!req) {
2856 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
2857 osd->o_osd, tid);
2858 m = NULL;
2859 *skip = 1;
2860 goto out;
2861 }
2862
2863 ceph_msg_revoke_incoming(req->r_reply);
2864
2865 if (front_len > req->r_reply->front_alloc_len) {
2866 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
2867 __func__, osd->o_osd, req->r_tid, front_len,
2868 req->r_reply->front_alloc_len);
2869 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2870 false);
2871 if (!m)
2872 goto out;
2873 ceph_msg_put(req->r_reply);
2874 req->r_reply = m;
2875 }
2876
2877 if (data_len > req->r_reply->data_length) {
2878 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
2879 __func__, osd->o_osd, req->r_tid, data_len,
2880 req->r_reply->data_length);
2881 m = NULL;
2882 *skip = 1;
2883 goto out;
2884 }
2885
2886 m = ceph_msg_get(req->r_reply);
2887 dout("get_reply tid %lld %p\n", tid, m);
2888
2889 out:
2890 mutex_unlock(&osdc->request_mutex);
2891 return m;
2892 }
2893
2894 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2895 struct ceph_msg_header *hdr,
2896 int *skip)
2897 {
2898 struct ceph_osd *osd = con->private;
2899 int type = le16_to_cpu(hdr->type);
2900 int front = le32_to_cpu(hdr->front_len);
2901
2902 *skip = 0;
2903 switch (type) {
2904 case CEPH_MSG_OSD_MAP:
2905 case CEPH_MSG_WATCH_NOTIFY:
2906 return ceph_msg_new(type, front, GFP_NOFS, false);
2907 case CEPH_MSG_OSD_OPREPLY:
2908 return get_reply(con, hdr, skip);
2909 default:
2910 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2911 osd->o_osd);
2912 *skip = 1;
2913 return NULL;
2914 }
2915 }
2916
2917 /*
2918 * Wrappers to refcount containing ceph_osd struct
2919 */
2920 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2921 {
2922 struct ceph_osd *osd = con->private;
2923 if (get_osd(osd))
2924 return con;
2925 return NULL;
2926 }
2927
2928 static void put_osd_con(struct ceph_connection *con)
2929 {
2930 struct ceph_osd *osd = con->private;
2931 put_osd(osd);
2932 }
2933
2934 /*
2935 * authentication
2936 */
2937 /*
2938 * Note: returned pointer is the address of a structure that's
2939 * managed separately. Caller must *not* attempt to free it.
2940 */
2941 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2942 int *proto, int force_new)
2943 {
2944 struct ceph_osd *o = con->private;
2945 struct ceph_osd_client *osdc = o->o_osdc;
2946 struct ceph_auth_client *ac = osdc->client->monc.auth;
2947 struct ceph_auth_handshake *auth = &o->o_auth;
2948
2949 if (force_new && auth->authorizer) {
2950 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2951 auth->authorizer = NULL;
2952 }
2953 if (!auth->authorizer) {
2954 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2955 auth);
2956 if (ret)
2957 return ERR_PTR(ret);
2958 } else {
2959 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2960 auth);
2961 if (ret)
2962 return ERR_PTR(ret);
2963 }
2964 *proto = ac->protocol;
2965
2966 return auth;
2967 }
2968
2969
2970 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2971 {
2972 struct ceph_osd *o = con->private;
2973 struct ceph_osd_client *osdc = o->o_osdc;
2974 struct ceph_auth_client *ac = osdc->client->monc.auth;
2975
2976 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2977 }
2978
2979 static int invalidate_authorizer(struct ceph_connection *con)
2980 {
2981 struct ceph_osd *o = con->private;
2982 struct ceph_osd_client *osdc = o->o_osdc;
2983 struct ceph_auth_client *ac = osdc->client->monc.auth;
2984
2985 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2986 return ceph_monc_validate_auth(&osdc->client->monc);
2987 }
2988
2989 static int osd_sign_message(struct ceph_msg *msg)
2990 {
2991 struct ceph_osd *o = msg->con->private;
2992 struct ceph_auth_handshake *auth = &o->o_auth;
2993
2994 return ceph_auth_sign_message(auth, msg);
2995 }
2996
2997 static int osd_check_message_signature(struct ceph_msg *msg)
2998 {
2999 struct ceph_osd *o = msg->con->private;
3000 struct ceph_auth_handshake *auth = &o->o_auth;
3001
3002 return ceph_auth_check_message_signature(auth, msg);
3003 }
3004
3005 static const struct ceph_connection_operations osd_con_ops = {
3006 .get = get_osd_con,
3007 .put = put_osd_con,
3008 .dispatch = dispatch,
3009 .get_authorizer = get_authorizer,
3010 .verify_authorizer_reply = verify_authorizer_reply,
3011 .invalidate_authorizer = invalidate_authorizer,
3012 .alloc_msg = alloc_msg,
3013 .sign_message = osd_sign_message,
3014 .check_message_signature = osd_check_message_signature,
3015 .fault = osd_reset,
3016 };
Linux kernel - Deliverables
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