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fs: create and use seq_show_option for escaping
[linux/fpc-iii.git] / net / ceph / osd_client.c
blob50033677c0fa5134d540fba82cc8e298ce1367a0
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 BUG_ON(whch >= (oreq)->r_num_ops); \
126 &(oreq)->r_ops[whch].typ.fld; \
127 })
128
129 static struct ceph_osd_data *
130 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
131 {
132 BUG_ON(which >= osd_req->r_num_ops);
133
134 return &osd_req->r_ops[which].raw_data_in;
135 }
136
137 struct ceph_osd_data *
138 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
139 unsigned int which)
140 {
141 return osd_req_op_data(osd_req, which, extent, osd_data);
142 }
143 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
144
145 struct ceph_osd_data *
146 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
147 unsigned int which)
148 {
149 return osd_req_op_data(osd_req, which, cls, response_data);
150 }
151 EXPORT_SYMBOL(osd_req_op_cls_response_data); /* ??? */
152
153 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
154 unsigned int which, struct page **pages,
155 u64 length, u32 alignment,
156 bool pages_from_pool, bool own_pages)
157 {
158 struct ceph_osd_data *osd_data;
159
160 osd_data = osd_req_op_raw_data_in(osd_req, which);
161 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
162 pages_from_pool, own_pages);
163 }
164 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
165
166 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
167 unsigned int which, struct page **pages,
168 u64 length, u32 alignment,
169 bool pages_from_pool, bool own_pages)
170 {
171 struct ceph_osd_data *osd_data;
172
173 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
174 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
175 pages_from_pool, own_pages);
176 }
177 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
178
179 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
180 unsigned int which, struct ceph_pagelist *pagelist)
181 {
182 struct ceph_osd_data *osd_data;
183
184 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
185 ceph_osd_data_pagelist_init(osd_data, pagelist);
186 }
187 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
188
189 #ifdef CONFIG_BLOCK
190 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
191 unsigned int which, struct bio *bio, size_t bio_length)
192 {
193 struct ceph_osd_data *osd_data;
194
195 osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
196 ceph_osd_data_bio_init(osd_data, bio, bio_length);
197 }
198 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
199 #endif /* CONFIG_BLOCK */
200
201 static void osd_req_op_cls_request_info_pagelist(
202 struct ceph_osd_request *osd_req,
203 unsigned int which, struct ceph_pagelist *pagelist)
204 {
205 struct ceph_osd_data *osd_data;
206
207 osd_data = osd_req_op_data(osd_req, which, cls, request_info);
208 ceph_osd_data_pagelist_init(osd_data, pagelist);
209 }
210
211 void osd_req_op_cls_request_data_pagelist(
212 struct ceph_osd_request *osd_req,
213 unsigned int which, struct ceph_pagelist *pagelist)
214 {
215 struct ceph_osd_data *osd_data;
216
217 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
218 ceph_osd_data_pagelist_init(osd_data, pagelist);
219 }
220 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
221
222 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
223 unsigned int which, struct page **pages, u64 length,
224 u32 alignment, bool pages_from_pool, bool own_pages)
225 {
226 struct ceph_osd_data *osd_data;
227
228 osd_data = osd_req_op_data(osd_req, which, cls, request_data);
229 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
230 pages_from_pool, own_pages);
231 }
232 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
233
234 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
235 unsigned int which, struct page **pages, u64 length,
236 u32 alignment, bool pages_from_pool, bool own_pages)
237 {
238 struct ceph_osd_data *osd_data;
239
240 osd_data = osd_req_op_data(osd_req, which, cls, response_data);
241 ceph_osd_data_pages_init(osd_data, pages, length, alignment,
242 pages_from_pool, own_pages);
243 }
244 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
245
246 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
247 {
248 switch (osd_data->type) {
249 case CEPH_OSD_DATA_TYPE_NONE:
250 return 0;
251 case CEPH_OSD_DATA_TYPE_PAGES:
252 return osd_data->length;
253 case CEPH_OSD_DATA_TYPE_PAGELIST:
254 return (u64)osd_data->pagelist->length;
255 #ifdef CONFIG_BLOCK
256 case CEPH_OSD_DATA_TYPE_BIO:
257 return (u64)osd_data->bio_length;
258 #endif /* CONFIG_BLOCK */
259 default:
260 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
261 return 0;
262 }
263 }
264
265 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
266 {
267 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
268 int num_pages;
269
270 num_pages = calc_pages_for((u64)osd_data->alignment,
271 (u64)osd_data->length);
272 ceph_release_page_vector(osd_data->pages, num_pages);
273 }
274 ceph_osd_data_init(osd_data);
275 }
276
277 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
278 unsigned int which)
279 {
280 struct ceph_osd_req_op *op;
281
282 BUG_ON(which >= osd_req->r_num_ops);
283 op = &osd_req->r_ops[which];
284
285 switch (op->op) {
286 case CEPH_OSD_OP_READ:
287 case CEPH_OSD_OP_WRITE:
288 ceph_osd_data_release(&op->extent.osd_data);
289 break;
290 case CEPH_OSD_OP_CALL:
291 ceph_osd_data_release(&op->cls.request_info);
292 ceph_osd_data_release(&op->cls.request_data);
293 ceph_osd_data_release(&op->cls.response_data);
294 break;
295 case CEPH_OSD_OP_SETXATTR:
296 case CEPH_OSD_OP_CMPXATTR:
297 ceph_osd_data_release(&op->xattr.osd_data);
298 break;
299 case CEPH_OSD_OP_STAT:
300 ceph_osd_data_release(&op->raw_data_in);
301 break;
302 default:
303 break;
304 }
305 }
306
307 /*
308 * requests
309 */
310 static void ceph_osdc_release_request(struct kref *kref)
311 {
312 struct ceph_osd_request *req = container_of(kref,
313 struct ceph_osd_request, r_kref);
314 unsigned int which;
315
316 dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
317 req->r_request, req->r_reply);
318 WARN_ON(!RB_EMPTY_NODE(&req->r_node));
319 WARN_ON(!list_empty(&req->r_req_lru_item));
320 WARN_ON(!list_empty(&req->r_osd_item));
321 WARN_ON(!list_empty(&req->r_linger_item));
322 WARN_ON(!list_empty(&req->r_linger_osd_item));
323 WARN_ON(req->r_osd);
324
325 if (req->r_request)
326 ceph_msg_put(req->r_request);
327 if (req->r_reply) {
328 ceph_msg_revoke_incoming(req->r_reply);
329 ceph_msg_put(req->r_reply);
330 }
331
332 for (which = 0; which < req->r_num_ops; which++)
333 osd_req_op_data_release(req, which);
334
335 ceph_put_snap_context(req->r_snapc);
336 if (req->r_mempool)
337 mempool_free(req, req->r_osdc->req_mempool);
338 else
339 kmem_cache_free(ceph_osd_request_cache, req);
340
341 }
342
343 void ceph_osdc_get_request(struct ceph_osd_request *req)
344 {
345 dout("%s %p (was %d)\n", __func__, req,
346 atomic_read(&req->r_kref.refcount));
347 kref_get(&req->r_kref);
348 }
349 EXPORT_SYMBOL(ceph_osdc_get_request);
350
351 void ceph_osdc_put_request(struct ceph_osd_request *req)
352 {
353 dout("%s %p (was %d)\n", __func__, req,
354 atomic_read(&req->r_kref.refcount));
355 kref_put(&req->r_kref, ceph_osdc_release_request);
356 }
357 EXPORT_SYMBOL(ceph_osdc_put_request);
358
359 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
360 struct ceph_snap_context *snapc,
361 unsigned int num_ops,
362 bool use_mempool,
363 gfp_t gfp_flags)
364 {
365 struct ceph_osd_request *req;
366 struct ceph_msg *msg;
367 size_t msg_size;
368
369 BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
370 BUG_ON(num_ops > CEPH_OSD_MAX_OP);
371
372 msg_size = 4 + 4 + 8 + 8 + 4+8;
373 msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
374 msg_size += 1 + 8 + 4 + 4; /* pg_t */
375 msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
376 msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
377 msg_size += 8; /* snapid */
378 msg_size += 8; /* snap_seq */
379 msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
380 msg_size += 4;
381
382 if (use_mempool) {
383 req = mempool_alloc(osdc->req_mempool, gfp_flags);
384 memset(req, 0, sizeof(*req));
385 } else {
386 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
387 }
388 if (req == NULL)
389 return NULL;
390
391 req->r_osdc = osdc;
392 req->r_mempool = use_mempool;
393 req->r_num_ops = num_ops;
394
395 kref_init(&req->r_kref);
396 init_completion(&req->r_completion);
397 init_completion(&req->r_safe_completion);
398 RB_CLEAR_NODE(&req->r_node);
399 INIT_LIST_HEAD(&req->r_unsafe_item);
400 INIT_LIST_HEAD(&req->r_linger_item);
401 INIT_LIST_HEAD(&req->r_linger_osd_item);
402 INIT_LIST_HEAD(&req->r_req_lru_item);
403 INIT_LIST_HEAD(&req->r_osd_item);
404
405 req->r_base_oloc.pool = -1;
406 req->r_target_oloc.pool = -1;
407
408 /* create reply message */
409 if (use_mempool)
410 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
411 else
412 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
413 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
414 if (!msg) {
415 ceph_osdc_put_request(req);
416 return NULL;
417 }
418 req->r_reply = msg;
419
420 /* create request message; allow space for oid */
421 if (use_mempool)
422 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
423 else
424 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
425 if (!msg) {
426 ceph_osdc_put_request(req);
427 return NULL;
428 }
429
430 memset(msg->front.iov_base, 0, msg->front.iov_len);
431
432 req->r_request = msg;
433
434 return req;
435 }
436 EXPORT_SYMBOL(ceph_osdc_alloc_request);
437
438 static bool osd_req_opcode_valid(u16 opcode)
439 {
440 switch (opcode) {
441 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
442 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
443 #undef GENERATE_CASE
444 default:
445 return false;
446 }
447 }
448
449 /*
450 * This is an osd op init function for opcodes that have no data or
451 * other information associated with them. It also serves as a
452 * common init routine for all the other init functions, below.
453 */
454 static struct ceph_osd_req_op *
455 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
456 u16 opcode, u32 flags)
457 {
458 struct ceph_osd_req_op *op;
459
460 BUG_ON(which >= osd_req->r_num_ops);
461 BUG_ON(!osd_req_opcode_valid(opcode));
462
463 op = &osd_req->r_ops[which];
464 memset(op, 0, sizeof (*op));
465 op->op = opcode;
466 op->flags = flags;
467
468 return op;
469 }
470
471 void osd_req_op_init(struct ceph_osd_request *osd_req,
472 unsigned int which, u16 opcode, u32 flags)
473 {
474 (void)_osd_req_op_init(osd_req, which, opcode, flags);
475 }
476 EXPORT_SYMBOL(osd_req_op_init);
477
478 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
479 unsigned int which, u16 opcode,
480 u64 offset, u64 length,
481 u64 truncate_size, u32 truncate_seq)
482 {
483 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
484 opcode, 0);
485 size_t payload_len = 0;
486
487 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
488 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE);
489
490 op->extent.offset = offset;
491 op->extent.length = length;
492 op->extent.truncate_size = truncate_size;
493 op->extent.truncate_seq = truncate_seq;
494 if (opcode == CEPH_OSD_OP_WRITE)
495 payload_len += length;
496
497 op->payload_len = payload_len;
498 }
499 EXPORT_SYMBOL(osd_req_op_extent_init);
500
501 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
502 unsigned int which, u64 length)
503 {
504 struct ceph_osd_req_op *op;
505 u64 previous;
506
507 BUG_ON(which >= osd_req->r_num_ops);
508 op = &osd_req->r_ops[which];
509 previous = op->extent.length;
510
511 if (length == previous)
512 return; /* Nothing to do */
513 BUG_ON(length > previous);
514
515 op->extent.length = length;
516 op->payload_len -= previous - length;
517 }
518 EXPORT_SYMBOL(osd_req_op_extent_update);
519
520 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
521 u16 opcode, const char *class, const char *method)
522 {
523 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
524 opcode, 0);
525 struct ceph_pagelist *pagelist;
526 size_t payload_len = 0;
527 size_t size;
528
529 BUG_ON(opcode != CEPH_OSD_OP_CALL);
530
531 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
532 BUG_ON(!pagelist);
533 ceph_pagelist_init(pagelist);
534
535 op->cls.class_name = class;
536 size = strlen(class);
537 BUG_ON(size > (size_t) U8_MAX);
538 op->cls.class_len = size;
539 ceph_pagelist_append(pagelist, class, size);
540 payload_len += size;
541
542 op->cls.method_name = method;
543 size = strlen(method);
544 BUG_ON(size > (size_t) U8_MAX);
545 op->cls.method_len = size;
546 ceph_pagelist_append(pagelist, method, size);
547 payload_len += size;
548
549 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
550
551 op->cls.argc = 0; /* currently unused */
552
553 op->payload_len = payload_len;
554 }
555 EXPORT_SYMBOL(osd_req_op_cls_init);
556
557 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
558 u16 opcode, const char *name, const void *value,
559 size_t size, u8 cmp_op, u8 cmp_mode)
560 {
561 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
562 opcode, 0);
563 struct ceph_pagelist *pagelist;
564 size_t payload_len;
565
566 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
567
568 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
569 if (!pagelist)
570 return -ENOMEM;
571
572 ceph_pagelist_init(pagelist);
573
574 payload_len = strlen(name);
575 op->xattr.name_len = payload_len;
576 ceph_pagelist_append(pagelist, name, payload_len);
577
578 op->xattr.value_len = size;
579 ceph_pagelist_append(pagelist, value, size);
580 payload_len += size;
581
582 op->xattr.cmp_op = cmp_op;
583 op->xattr.cmp_mode = cmp_mode;
584
585 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
586 op->payload_len = payload_len;
587 return 0;
588 }
589 EXPORT_SYMBOL(osd_req_op_xattr_init);
590
591 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
592 unsigned int which, u16 opcode,
593 u64 cookie, u64 version, int flag)
594 {
595 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
596 opcode, 0);
597
598 BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
599
600 op->watch.cookie = cookie;
601 op->watch.ver = version;
602 if (opcode == CEPH_OSD_OP_WATCH && flag)
603 op->watch.flag = (u8)1;
604 }
605 EXPORT_SYMBOL(osd_req_op_watch_init);
606
607 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
608 unsigned int which,
609 u64 expected_object_size,
610 u64 expected_write_size)
611 {
612 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
613 CEPH_OSD_OP_SETALLOCHINT,
614 0);
615
616 op->alloc_hint.expected_object_size = expected_object_size;
617 op->alloc_hint.expected_write_size = expected_write_size;
618
619 /*
620 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
621 * not worth a feature bit. Set FAILOK per-op flag to make
622 * sure older osds don't trip over an unsupported opcode.
623 */
624 op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
625 }
626 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
627
628 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
629 struct ceph_osd_data *osd_data)
630 {
631 u64 length = ceph_osd_data_length(osd_data);
632
633 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
634 BUG_ON(length > (u64) SIZE_MAX);
635 if (length)
636 ceph_msg_data_add_pages(msg, osd_data->pages,
637 length, osd_data->alignment);
638 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
639 BUG_ON(!length);
640 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
641 #ifdef CONFIG_BLOCK
642 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
643 ceph_msg_data_add_bio(msg, osd_data->bio, length);
644 #endif
645 } else {
646 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
647 }
648 }
649
650 static u64 osd_req_encode_op(struct ceph_osd_request *req,
651 struct ceph_osd_op *dst, unsigned int which)
652 {
653 struct ceph_osd_req_op *src;
654 struct ceph_osd_data *osd_data;
655 u64 request_data_len = 0;
656 u64 data_length;
657
658 BUG_ON(which >= req->r_num_ops);
659 src = &req->r_ops[which];
660 if (WARN_ON(!osd_req_opcode_valid(src->op))) {
661 pr_err("unrecognized osd opcode %d\n", src->op);
662
663 return 0;
664 }
665
666 switch (src->op) {
667 case CEPH_OSD_OP_STAT:
668 osd_data = &src->raw_data_in;
669 ceph_osdc_msg_data_add(req->r_reply, osd_data);
670 break;
671 case CEPH_OSD_OP_READ:
672 case CEPH_OSD_OP_WRITE:
673 case CEPH_OSD_OP_ZERO:
674 case CEPH_OSD_OP_TRUNCATE:
675 if (src->op == CEPH_OSD_OP_WRITE)
676 request_data_len = src->extent.length;
677 dst->extent.offset = cpu_to_le64(src->extent.offset);
678 dst->extent.length = cpu_to_le64(src->extent.length);
679 dst->extent.truncate_size =
680 cpu_to_le64(src->extent.truncate_size);
681 dst->extent.truncate_seq =
682 cpu_to_le32(src->extent.truncate_seq);
683 osd_data = &src->extent.osd_data;
684 if (src->op == CEPH_OSD_OP_WRITE)
685 ceph_osdc_msg_data_add(req->r_request, osd_data);
686 else
687 ceph_osdc_msg_data_add(req->r_reply, osd_data);
688 break;
689 case CEPH_OSD_OP_CALL:
690 dst->cls.class_len = src->cls.class_len;
691 dst->cls.method_len = src->cls.method_len;
692 osd_data = &src->cls.request_info;
693 ceph_osdc_msg_data_add(req->r_request, osd_data);
694 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
695 request_data_len = osd_data->pagelist->length;
696
697 osd_data = &src->cls.request_data;
698 data_length = ceph_osd_data_length(osd_data);
699 if (data_length) {
700 BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
701 dst->cls.indata_len = cpu_to_le32(data_length);
702 ceph_osdc_msg_data_add(req->r_request, osd_data);
703 src->payload_len += data_length;
704 request_data_len += data_length;
705 }
706 osd_data = &src->cls.response_data;
707 ceph_osdc_msg_data_add(req->r_reply, osd_data);
708 break;
709 case CEPH_OSD_OP_STARTSYNC:
710 break;
711 case CEPH_OSD_OP_NOTIFY_ACK:
712 case CEPH_OSD_OP_WATCH:
713 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
714 dst->watch.ver = cpu_to_le64(src->watch.ver);
715 dst->watch.flag = src->watch.flag;
716 break;
717 case CEPH_OSD_OP_SETALLOCHINT:
718 dst->alloc_hint.expected_object_size =
719 cpu_to_le64(src->alloc_hint.expected_object_size);
720 dst->alloc_hint.expected_write_size =
721 cpu_to_le64(src->alloc_hint.expected_write_size);
722 break;
723 case CEPH_OSD_OP_SETXATTR:
724 case CEPH_OSD_OP_CMPXATTR:
725 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
726 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
727 dst->xattr.cmp_op = src->xattr.cmp_op;
728 dst->xattr.cmp_mode = src->xattr.cmp_mode;
729 osd_data = &src->xattr.osd_data;
730 ceph_osdc_msg_data_add(req->r_request, osd_data);
731 request_data_len = osd_data->pagelist->length;
732 break;
733 case CEPH_OSD_OP_CREATE:
734 case CEPH_OSD_OP_DELETE:
735 break;
736 default:
737 pr_err("unsupported osd opcode %s\n",
738 ceph_osd_op_name(src->op));
739 WARN_ON(1);
740
741 return 0;
742 }
743
744 dst->op = cpu_to_le16(src->op);
745 dst->flags = cpu_to_le32(src->flags);
746 dst->payload_len = cpu_to_le32(src->payload_len);
747
748 return request_data_len;
749 }
750
751 /*
752 * build new request AND message, calculate layout, and adjust file
753 * extent as needed.
754 *
755 * if the file was recently truncated, we include information about its
756 * old and new size so that the object can be updated appropriately. (we
757 * avoid synchronously deleting truncated objects because it's slow.)
758 *
759 * if @do_sync, include a 'startsync' command so that the osd will flush
760 * data quickly.
761 */
762 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
763 struct ceph_file_layout *layout,
764 struct ceph_vino vino,
765 u64 off, u64 *plen,
766 unsigned int which, int num_ops,
767 int opcode, int flags,
768 struct ceph_snap_context *snapc,
769 u32 truncate_seq,
770 u64 truncate_size,
771 bool use_mempool)
772 {
773 struct ceph_osd_request *req;
774 u64 objnum = 0;
775 u64 objoff = 0;
776 u64 objlen = 0;
777 int r;
778
779 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
780 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
781 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
782
783 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
784 GFP_NOFS);
785 if (!req)
786 return ERR_PTR(-ENOMEM);
787
788 req->r_flags = flags;
789
790 /* calculate max write size */
791 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
792 if (r < 0) {
793 ceph_osdc_put_request(req);
794 return ERR_PTR(r);
795 }
796
797 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
798 osd_req_op_init(req, which, opcode, 0);
799 } else {
800 u32 object_size = le32_to_cpu(layout->fl_object_size);
801 u32 object_base = off - objoff;
802 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
803 if (truncate_size <= object_base) {
804 truncate_size = 0;
805 } else {
806 truncate_size -= object_base;
807 if (truncate_size > object_size)
808 truncate_size = object_size;
809 }
810 }
811 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
812 truncate_size, truncate_seq);
813 }
814
815 req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
816
817 snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
818 "%llx.%08llx", vino.ino, objnum);
819 req->r_base_oid.name_len = strlen(req->r_base_oid.name);
820
821 return req;
822 }
823 EXPORT_SYMBOL(ceph_osdc_new_request);
824
825 /*
826 * We keep osd requests in an rbtree, sorted by ->r_tid.
827 */
828 static void __insert_request(struct ceph_osd_client *osdc,
829 struct ceph_osd_request *new)
830 {
831 struct rb_node **p = &osdc->requests.rb_node;
832 struct rb_node *parent = NULL;
833 struct ceph_osd_request *req = NULL;
834
835 while (*p) {
836 parent = *p;
837 req = rb_entry(parent, struct ceph_osd_request, r_node);
838 if (new->r_tid < req->r_tid)
839 p = &(*p)->rb_left;
840 else if (new->r_tid > req->r_tid)
841 p = &(*p)->rb_right;
842 else
843 BUG();
844 }
845
846 rb_link_node(&new->r_node, parent, p);
847 rb_insert_color(&new->r_node, &osdc->requests);
848 }
849
850 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
851 u64 tid)
852 {
853 struct ceph_osd_request *req;
854 struct rb_node *n = osdc->requests.rb_node;
855
856 while (n) {
857 req = rb_entry(n, struct ceph_osd_request, r_node);
858 if (tid < req->r_tid)
859 n = n->rb_left;
860 else if (tid > req->r_tid)
861 n = n->rb_right;
862 else
863 return req;
864 }
865 return NULL;
866 }
867
868 static struct ceph_osd_request *
869 __lookup_request_ge(struct ceph_osd_client *osdc,
870 u64 tid)
871 {
872 struct ceph_osd_request *req;
873 struct rb_node *n = osdc->requests.rb_node;
874
875 while (n) {
876 req = rb_entry(n, struct ceph_osd_request, r_node);
877 if (tid < req->r_tid) {
878 if (!n->rb_left)
879 return req;
880 n = n->rb_left;
881 } else if (tid > req->r_tid) {
882 n = n->rb_right;
883 } else {
884 return req;
885 }
886 }
887 return NULL;
888 }
889
890 static void __kick_linger_request(struct ceph_osd_request *req)
891 {
892 struct ceph_osd_client *osdc = req->r_osdc;
893 struct ceph_osd *osd = req->r_osd;
894
895 /*
896 * Linger requests need to be resent with a new tid to avoid
897 * the dup op detection logic on the OSDs. Achieve this with
898 * a re-register dance instead of open-coding.
899 */
900 ceph_osdc_get_request(req);
901 if (!list_empty(&req->r_linger_item))
902 __unregister_linger_request(osdc, req);
903 else
904 __unregister_request(osdc, req);
905 __register_request(osdc, req);
906 ceph_osdc_put_request(req);
907
908 /*
909 * Unless request has been registered as both normal and
910 * lingering, __unregister{,_linger}_request clears r_osd.
911 * However, here we need to preserve r_osd to make sure we
912 * requeue on the same OSD.
913 */
914 WARN_ON(req->r_osd || !osd);
915 req->r_osd = osd;
916
917 dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
918 __enqueue_request(req);
919 }
920
921 /*
922 * Resubmit requests pending on the given osd.
923 */
924 static void __kick_osd_requests(struct ceph_osd_client *osdc,
925 struct ceph_osd *osd)
926 {
927 struct ceph_osd_request *req, *nreq;
928 LIST_HEAD(resend);
929 LIST_HEAD(resend_linger);
930 int err;
931
932 dout("%s osd%d\n", __func__, osd->o_osd);
933 err = __reset_osd(osdc, osd);
934 if (err)
935 return;
936
937 /*
938 * Build up a list of requests to resend by traversing the
939 * osd's list of requests. Requests for a given object are
940 * sent in tid order, and that is also the order they're
941 * kept on this list. Therefore all requests that are in
942 * flight will be found first, followed by all requests that
943 * have not yet been sent. And to resend requests while
944 * preserving this order we will want to put any sent
945 * requests back on the front of the osd client's unsent
946 * list.
947 *
948 * So we build a separate ordered list of already-sent
949 * requests for the affected osd and splice it onto the
950 * front of the osd client's unsent list. Once we've seen a
951 * request that has not yet been sent we're done. Those
952 * requests are already sitting right where they belong.
953 */
954 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
955 if (!req->r_sent)
956 break;
957
958 if (!req->r_linger) {
959 dout("%s requeueing %p tid %llu\n", __func__, req,
960 req->r_tid);
961 list_move_tail(&req->r_req_lru_item, &resend);
962 req->r_flags |= CEPH_OSD_FLAG_RETRY;
963 } else {
964 list_move_tail(&req->r_req_lru_item, &resend_linger);
965 }
966 }
967 list_splice(&resend, &osdc->req_unsent);
968
969 /*
970 * Both registered and not yet registered linger requests are
971 * enqueued with a new tid on the same OSD. We add/move them
972 * to req_unsent/o_requests at the end to keep things in tid
973 * order.
974 */
975 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
976 r_linger_osd_item) {
977 WARN_ON(!list_empty(&req->r_req_lru_item));
978 __kick_linger_request(req);
979 }
980
981 list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
982 __kick_linger_request(req);
983 }
984
985 /*
986 * If the osd connection drops, we need to resubmit all requests.
987 */
988 static void osd_reset(struct ceph_connection *con)
989 {
990 struct ceph_osd *osd = con->private;
991 struct ceph_osd_client *osdc;
992
993 if (!osd)
994 return;
995 dout("osd_reset osd%d\n", osd->o_osd);
996 osdc = osd->o_osdc;
997 down_read(&osdc->map_sem);
998 mutex_lock(&osdc->request_mutex);
999 __kick_osd_requests(osdc, osd);
1000 __send_queued(osdc);
1001 mutex_unlock(&osdc->request_mutex);
1002 up_read(&osdc->map_sem);
1003 }
1004
1005 /*
1006 * Track open sessions with osds.
1007 */
1008 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1009 {
1010 struct ceph_osd *osd;
1011
1012 osd = kzalloc(sizeof(*osd), GFP_NOFS);
1013 if (!osd)
1014 return NULL;
1015
1016 atomic_set(&osd->o_ref, 1);
1017 osd->o_osdc = osdc;
1018 osd->o_osd = onum;
1019 RB_CLEAR_NODE(&osd->o_node);
1020 INIT_LIST_HEAD(&osd->o_requests);
1021 INIT_LIST_HEAD(&osd->o_linger_requests);
1022 INIT_LIST_HEAD(&osd->o_osd_lru);
1023 osd->o_incarnation = 1;
1024
1025 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1026
1027 INIT_LIST_HEAD(&osd->o_keepalive_item);
1028 return osd;
1029 }
1030
1031 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1032 {
1033 if (atomic_inc_not_zero(&osd->o_ref)) {
1034 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1035 atomic_read(&osd->o_ref));
1036 return osd;
1037 } else {
1038 dout("get_osd %p FAIL\n", osd);
1039 return NULL;
1040 }
1041 }
1042
1043 static void put_osd(struct ceph_osd *osd)
1044 {
1045 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1046 atomic_read(&osd->o_ref) - 1);
1047 if (atomic_dec_and_test(&osd->o_ref)) {
1048 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1049
1050 if (osd->o_auth.authorizer)
1051 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1052 kfree(osd);
1053 }
1054 }
1055
1056 /*
1057 * remove an osd from our map
1058 */
1059 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1060 {
1061 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1062 WARN_ON(!list_empty(&osd->o_requests));
1063 WARN_ON(!list_empty(&osd->o_linger_requests));
1064
1065 list_del_init(&osd->o_osd_lru);
1066 rb_erase(&osd->o_node, &osdc->osds);
1067 RB_CLEAR_NODE(&osd->o_node);
1068 }
1069
1070 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1071 {
1072 dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1073
1074 if (!RB_EMPTY_NODE(&osd->o_node)) {
1075 ceph_con_close(&osd->o_con);
1076 __remove_osd(osdc, osd);
1077 put_osd(osd);
1078 }
1079 }
1080
1081 static void remove_all_osds(struct ceph_osd_client *osdc)
1082 {
1083 dout("%s %p\n", __func__, osdc);
1084 mutex_lock(&osdc->request_mutex);
1085 while (!RB_EMPTY_ROOT(&osdc->osds)) {
1086 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1087 struct ceph_osd, o_node);
1088 remove_osd(osdc, osd);
1089 }
1090 mutex_unlock(&osdc->request_mutex);
1091 }
1092
1093 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1094 struct ceph_osd *osd)
1095 {
1096 dout("%s %p\n", __func__, osd);
1097 BUG_ON(!list_empty(&osd->o_osd_lru));
1098
1099 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1100 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1101 }
1102
1103 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1104 struct ceph_osd *osd)
1105 {
1106 dout("%s %p\n", __func__, osd);
1107
1108 if (list_empty(&osd->o_requests) &&
1109 list_empty(&osd->o_linger_requests))
1110 __move_osd_to_lru(osdc, osd);
1111 }
1112
1113 static void __remove_osd_from_lru(struct ceph_osd *osd)
1114 {
1115 dout("__remove_osd_from_lru %p\n", osd);
1116 if (!list_empty(&osd->o_osd_lru))
1117 list_del_init(&osd->o_osd_lru);
1118 }
1119
1120 static void remove_old_osds(struct ceph_osd_client *osdc)
1121 {
1122 struct ceph_osd *osd, *nosd;
1123
1124 dout("__remove_old_osds %p\n", osdc);
1125 mutex_lock(&osdc->request_mutex);
1126 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1127 if (time_before(jiffies, osd->lru_ttl))
1128 break;
1129 remove_osd(osdc, osd);
1130 }
1131 mutex_unlock(&osdc->request_mutex);
1132 }
1133
1134 /*
1135 * reset osd connect
1136 */
1137 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1138 {
1139 struct ceph_entity_addr *peer_addr;
1140
1141 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1142 if (list_empty(&osd->o_requests) &&
1143 list_empty(&osd->o_linger_requests)) {
1144 remove_osd(osdc, osd);
1145 return -ENODEV;
1146 }
1147
1148 peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1149 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1150 !ceph_con_opened(&osd->o_con)) {
1151 struct ceph_osd_request *req;
1152
1153 dout("osd addr hasn't changed and connection never opened, "
1154 "letting msgr retry\n");
1155 /* touch each r_stamp for handle_timeout()'s benfit */
1156 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1157 req->r_stamp = jiffies;
1158
1159 return -EAGAIN;
1160 }
1161
1162 ceph_con_close(&osd->o_con);
1163 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1164 osd->o_incarnation++;
1165
1166 return 0;
1167 }
1168
1169 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1170 {
1171 struct rb_node **p = &osdc->osds.rb_node;
1172 struct rb_node *parent = NULL;
1173 struct ceph_osd *osd = NULL;
1174
1175 dout("__insert_osd %p osd%d\n", new, new->o_osd);
1176 while (*p) {
1177 parent = *p;
1178 osd = rb_entry(parent, struct ceph_osd, o_node);
1179 if (new->o_osd < osd->o_osd)
1180 p = &(*p)->rb_left;
1181 else if (new->o_osd > osd->o_osd)
1182 p = &(*p)->rb_right;
1183 else
1184 BUG();
1185 }
1186
1187 rb_link_node(&new->o_node, parent, p);
1188 rb_insert_color(&new->o_node, &osdc->osds);
1189 }
1190
1191 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1192 {
1193 struct ceph_osd *osd;
1194 struct rb_node *n = osdc->osds.rb_node;
1195
1196 while (n) {
1197 osd = rb_entry(n, struct ceph_osd, o_node);
1198 if (o < osd->o_osd)
1199 n = n->rb_left;
1200 else if (o > osd->o_osd)
1201 n = n->rb_right;
1202 else
1203 return osd;
1204 }
1205 return NULL;
1206 }
1207
1208 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1209 {
1210 schedule_delayed_work(&osdc->timeout_work,
1211 osdc->client->options->osd_keepalive_timeout);
1212 }
1213
1214 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1215 {
1216 cancel_delayed_work(&osdc->timeout_work);
1217 }
1218
1219 /*
1220 * Register request, assign tid. If this is the first request, set up
1221 * the timeout event.
1222 */
1223 static void __register_request(struct ceph_osd_client *osdc,
1224 struct ceph_osd_request *req)
1225 {
1226 req->r_tid = ++osdc->last_tid;
1227 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1228 dout("__register_request %p tid %lld\n", req, req->r_tid);
1229 __insert_request(osdc, req);
1230 ceph_osdc_get_request(req);
1231 osdc->num_requests++;
1232 if (osdc->num_requests == 1) {
1233 dout(" first request, scheduling timeout\n");
1234 __schedule_osd_timeout(osdc);
1235 }
1236 }
1237
1238 /*
1239 * called under osdc->request_mutex
1240 */
1241 static void __unregister_request(struct ceph_osd_client *osdc,
1242 struct ceph_osd_request *req)
1243 {
1244 if (RB_EMPTY_NODE(&req->r_node)) {
1245 dout("__unregister_request %p tid %lld not registered\n",
1246 req, req->r_tid);
1247 return;
1248 }
1249
1250 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1251 rb_erase(&req->r_node, &osdc->requests);
1252 RB_CLEAR_NODE(&req->r_node);
1253 osdc->num_requests--;
1254
1255 if (req->r_osd) {
1256 /* make sure the original request isn't in flight. */
1257 ceph_msg_revoke(req->r_request);
1258
1259 list_del_init(&req->r_osd_item);
1260 maybe_move_osd_to_lru(osdc, req->r_osd);
1261 if (list_empty(&req->r_linger_osd_item))
1262 req->r_osd = NULL;
1263 }
1264
1265 list_del_init(&req->r_req_lru_item);
1266 ceph_osdc_put_request(req);
1267
1268 if (osdc->num_requests == 0) {
1269 dout(" no requests, canceling timeout\n");
1270 __cancel_osd_timeout(osdc);
1271 }
1272 }
1273
1274 /*
1275 * Cancel a previously queued request message
1276 */
1277 static void __cancel_request(struct ceph_osd_request *req)
1278 {
1279 if (req->r_sent && req->r_osd) {
1280 ceph_msg_revoke(req->r_request);
1281 req->r_sent = 0;
1282 }
1283 }
1284
1285 static void __register_linger_request(struct ceph_osd_client *osdc,
1286 struct ceph_osd_request *req)
1287 {
1288 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1289 WARN_ON(!req->r_linger);
1290
1291 ceph_osdc_get_request(req);
1292 list_add_tail(&req->r_linger_item, &osdc->req_linger);
1293 if (req->r_osd)
1294 list_add_tail(&req->r_linger_osd_item,
1295 &req->r_osd->o_linger_requests);
1296 }
1297
1298 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1299 struct ceph_osd_request *req)
1300 {
1301 WARN_ON(!req->r_linger);
1302
1303 if (list_empty(&req->r_linger_item)) {
1304 dout("%s %p tid %llu not registered\n", __func__, req,
1305 req->r_tid);
1306 return;
1307 }
1308
1309 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1310 list_del_init(&req->r_linger_item);
1311
1312 if (req->r_osd) {
1313 list_del_init(&req->r_linger_osd_item);
1314 maybe_move_osd_to_lru(osdc, req->r_osd);
1315 if (list_empty(&req->r_osd_item))
1316 req->r_osd = NULL;
1317 }
1318 ceph_osdc_put_request(req);
1319 }
1320
1321 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1322 struct ceph_osd_request *req)
1323 {
1324 if (!req->r_linger) {
1325 dout("set_request_linger %p\n", req);
1326 req->r_linger = 1;
1327 }
1328 }
1329 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1330
1331 /*
1332 * Returns whether a request should be blocked from being sent
1333 * based on the current osdmap and osd_client settings.
1334 *
1335 * Caller should hold map_sem for read.
1336 */
1337 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1338 struct ceph_osd_request *req)
1339 {
1340 bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1341 bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1342 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1343 return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1344 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1345 }
1346
1347 /*
1348 * Calculate mapping of a request to a PG. Takes tiering into account.
1349 */
1350 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1351 struct ceph_osd_request *req,
1352 struct ceph_pg *pg_out)
1353 {
1354 bool need_check_tiering;
1355
1356 need_check_tiering = false;
1357 if (req->r_target_oloc.pool == -1) {
1358 req->r_target_oloc = req->r_base_oloc; /* struct */
1359 need_check_tiering = true;
1360 }
1361 if (req->r_target_oid.name_len == 0) {
1362 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1363 need_check_tiering = true;
1364 }
1365
1366 if (need_check_tiering &&
1367 (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1368 struct ceph_pg_pool_info *pi;
1369
1370 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1371 if (pi) {
1372 if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1373 pi->read_tier >= 0)
1374 req->r_target_oloc.pool = pi->read_tier;
1375 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1376 pi->write_tier >= 0)
1377 req->r_target_oloc.pool = pi->write_tier;
1378 }
1379 /* !pi is caught in ceph_oloc_oid_to_pg() */
1380 }
1381
1382 return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1383 &req->r_target_oid, pg_out);
1384 }
1385
1386 static void __enqueue_request(struct ceph_osd_request *req)
1387 {
1388 struct ceph_osd_client *osdc = req->r_osdc;
1389
1390 dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1391 req->r_osd ? req->r_osd->o_osd : -1);
1392
1393 if (req->r_osd) {
1394 __remove_osd_from_lru(req->r_osd);
1395 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1396 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1397 } else {
1398 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1399 }
1400 }
1401
1402 /*
1403 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1404 * (as needed), and set the request r_osd appropriately. If there is
1405 * no up osd, set r_osd to NULL. Move the request to the appropriate list
1406 * (unsent, homeless) or leave on in-flight lru.
1407 *
1408 * Return 0 if unchanged, 1 if changed, or negative on error.
1409 *
1410 * Caller should hold map_sem for read and request_mutex.
1411 */
1412 static int __map_request(struct ceph_osd_client *osdc,
1413 struct ceph_osd_request *req, int force_resend)
1414 {
1415 struct ceph_pg pgid;
1416 int acting[CEPH_PG_MAX_SIZE];
1417 int num, o;
1418 int err;
1419 bool was_paused;
1420
1421 dout("map_request %p tid %lld\n", req, req->r_tid);
1422
1423 err = __calc_request_pg(osdc->osdmap, req, &pgid);
1424 if (err) {
1425 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1426 return err;
1427 }
1428 req->r_pgid = pgid;
1429
1430 num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1431 if (num < 0)
1432 num = 0;
1433
1434 was_paused = req->r_paused;
1435 req->r_paused = __req_should_be_paused(osdc, req);
1436 if (was_paused && !req->r_paused)
1437 force_resend = 1;
1438
1439 if ((!force_resend &&
1440 req->r_osd && req->r_osd->o_osd == o &&
1441 req->r_sent >= req->r_osd->o_incarnation &&
1442 req->r_num_pg_osds == num &&
1443 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1444 (req->r_osd == NULL && o == -1) ||
1445 req->r_paused)
1446 return 0; /* no change */
1447
1448 dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1449 req->r_tid, pgid.pool, pgid.seed, o,
1450 req->r_osd ? req->r_osd->o_osd : -1);
1451
1452 /* record full pg acting set */
1453 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1454 req->r_num_pg_osds = num;
1455
1456 if (req->r_osd) {
1457 __cancel_request(req);
1458 list_del_init(&req->r_osd_item);
1459 list_del_init(&req->r_linger_osd_item);
1460 req->r_osd = NULL;
1461 }
1462
1463 req->r_osd = __lookup_osd(osdc, o);
1464 if (!req->r_osd && o >= 0) {
1465 err = -ENOMEM;
1466 req->r_osd = create_osd(osdc, o);
1467 if (!req->r_osd) {
1468 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1469 goto out;
1470 }
1471
1472 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1473 __insert_osd(osdc, req->r_osd);
1474
1475 ceph_con_open(&req->r_osd->o_con,
1476 CEPH_ENTITY_TYPE_OSD, o,
1477 &osdc->osdmap->osd_addr[o]);
1478 }
1479
1480 __enqueue_request(req);
1481 err = 1; /* osd or pg changed */
1482
1483 out:
1484 return err;
1485 }
1486
1487 /*
1488 * caller should hold map_sem (for read) and request_mutex
1489 */
1490 static void __send_request(struct ceph_osd_client *osdc,
1491 struct ceph_osd_request *req)
1492 {
1493 void *p;
1494
1495 dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1496 req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1497 (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1498
1499 /* fill in message content that changes each time we send it */
1500 put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1501 put_unaligned_le32(req->r_flags, req->r_request_flags);
1502 put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1503 p = req->r_request_pgid;
1504 ceph_encode_64(&p, req->r_pgid.pool);
1505 ceph_encode_32(&p, req->r_pgid.seed);
1506 put_unaligned_le64(1, req->r_request_attempts); /* FIXME */
1507 memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1508 sizeof(req->r_reassert_version));
1509
1510 req->r_stamp = jiffies;
1511 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1512
1513 ceph_msg_get(req->r_request); /* send consumes a ref */
1514
1515 req->r_sent = req->r_osd->o_incarnation;
1516
1517 ceph_con_send(&req->r_osd->o_con, req->r_request);
1518 }
1519
1520 /*
1521 * Send any requests in the queue (req_unsent).
1522 */
1523 static void __send_queued(struct ceph_osd_client *osdc)
1524 {
1525 struct ceph_osd_request *req, *tmp;
1526
1527 dout("__send_queued\n");
1528 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1529 __send_request(osdc, req);
1530 }
1531
1532 /*
1533 * Caller should hold map_sem for read and request_mutex.
1534 */
1535 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1536 struct ceph_osd_request *req,
1537 bool nofail)
1538 {
1539 int rc;
1540
1541 __register_request(osdc, req);
1542 req->r_sent = 0;
1543 req->r_got_reply = 0;
1544 rc = __map_request(osdc, req, 0);
1545 if (rc < 0) {
1546 if (nofail) {
1547 dout("osdc_start_request failed map, "
1548 " will retry %lld\n", req->r_tid);
1549 rc = 0;
1550 } else {
1551 __unregister_request(osdc, req);
1552 }
1553 return rc;
1554 }
1555
1556 if (req->r_osd == NULL) {
1557 dout("send_request %p no up osds in pg\n", req);
1558 ceph_monc_request_next_osdmap(&osdc->client->monc);
1559 } else {
1560 __send_queued(osdc);
1561 }
1562
1563 return 0;
1564 }
1565
1566 /*
1567 * Timeout callback, called every N seconds when 1 or more osd
1568 * requests has been active for more than N seconds. When this
1569 * happens, we ping all OSDs with requests who have timed out to
1570 * ensure any communications channel reset is detected. Reset the
1571 * request timeouts another N seconds in the future as we go.
1572 * Reschedule the timeout event another N seconds in future (unless
1573 * there are no open requests).
1574 */
1575 static void handle_timeout(struct work_struct *work)
1576 {
1577 struct ceph_osd_client *osdc =
1578 container_of(work, struct ceph_osd_client, timeout_work.work);
1579 struct ceph_options *opts = osdc->client->options;
1580 struct ceph_osd_request *req;
1581 struct ceph_osd *osd;
1582 struct list_head slow_osds;
1583 dout("timeout\n");
1584 down_read(&osdc->map_sem);
1585
1586 ceph_monc_request_next_osdmap(&osdc->client->monc);
1587
1588 mutex_lock(&osdc->request_mutex);
1589
1590 /*
1591 * ping osds that are a bit slow. this ensures that if there
1592 * is a break in the TCP connection we will notice, and reopen
1593 * a connection with that osd (from the fault callback).
1594 */
1595 INIT_LIST_HEAD(&slow_osds);
1596 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1597 if (time_before(jiffies,
1598 req->r_stamp + opts->osd_keepalive_timeout))
1599 break;
1600
1601 osd = req->r_osd;
1602 BUG_ON(!osd);
1603 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1604 req->r_tid, osd->o_osd);
1605 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1606 }
1607 while (!list_empty(&slow_osds)) {
1608 osd = list_entry(slow_osds.next, struct ceph_osd,
1609 o_keepalive_item);
1610 list_del_init(&osd->o_keepalive_item);
1611 ceph_con_keepalive(&osd->o_con);
1612 }
1613
1614 __schedule_osd_timeout(osdc);
1615 __send_queued(osdc);
1616 mutex_unlock(&osdc->request_mutex);
1617 up_read(&osdc->map_sem);
1618 }
1619
1620 static void handle_osds_timeout(struct work_struct *work)
1621 {
1622 struct ceph_osd_client *osdc =
1623 container_of(work, struct ceph_osd_client,
1624 osds_timeout_work.work);
1625 unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
1626
1627 dout("osds timeout\n");
1628 down_read(&osdc->map_sem);
1629 remove_old_osds(osdc);
1630 up_read(&osdc->map_sem);
1631
1632 schedule_delayed_work(&osdc->osds_timeout_work,
1633 round_jiffies_relative(delay));
1634 }
1635
1636 static int ceph_oloc_decode(void **p, void *end,
1637 struct ceph_object_locator *oloc)
1638 {
1639 u8 struct_v, struct_cv;
1640 u32 len;
1641 void *struct_end;
1642 int ret = 0;
1643
1644 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1645 struct_v = ceph_decode_8(p);
1646 struct_cv = ceph_decode_8(p);
1647 if (struct_v < 3) {
1648 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1649 struct_v, struct_cv);
1650 goto e_inval;
1651 }
1652 if (struct_cv > 6) {
1653 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1654 struct_v, struct_cv);
1655 goto e_inval;
1656 }
1657 len = ceph_decode_32(p);
1658 ceph_decode_need(p, end, len, e_inval);
1659 struct_end = *p + len;
1660
1661 oloc->pool = ceph_decode_64(p);
1662 *p += 4; /* skip preferred */
1663
1664 len = ceph_decode_32(p);
1665 if (len > 0) {
1666 pr_warn("ceph_object_locator::key is set\n");
1667 goto e_inval;
1668 }
1669
1670 if (struct_v >= 5) {
1671 len = ceph_decode_32(p);
1672 if (len > 0) {
1673 pr_warn("ceph_object_locator::nspace is set\n");
1674 goto e_inval;
1675 }
1676 }
1677
1678 if (struct_v >= 6) {
1679 s64 hash = ceph_decode_64(p);
1680 if (hash != -1) {
1681 pr_warn("ceph_object_locator::hash is set\n");
1682 goto e_inval;
1683 }
1684 }
1685
1686 /* skip the rest */
1687 *p = struct_end;
1688 out:
1689 return ret;
1690
1691 e_inval:
1692 ret = -EINVAL;
1693 goto out;
1694 }
1695
1696 static int ceph_redirect_decode(void **p, void *end,
1697 struct ceph_request_redirect *redir)
1698 {
1699 u8 struct_v, struct_cv;
1700 u32 len;
1701 void *struct_end;
1702 int ret;
1703
1704 ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1705 struct_v = ceph_decode_8(p);
1706 struct_cv = ceph_decode_8(p);
1707 if (struct_cv > 1) {
1708 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1709 struct_v, struct_cv);
1710 goto e_inval;
1711 }
1712 len = ceph_decode_32(p);
1713 ceph_decode_need(p, end, len, e_inval);
1714 struct_end = *p + len;
1715
1716 ret = ceph_oloc_decode(p, end, &redir->oloc);
1717 if (ret)
1718 goto out;
1719
1720 len = ceph_decode_32(p);
1721 if (len > 0) {
1722 pr_warn("ceph_request_redirect::object_name is set\n");
1723 goto e_inval;
1724 }
1725
1726 len = ceph_decode_32(p);
1727 *p += len; /* skip osd_instructions */
1728
1729 /* skip the rest */
1730 *p = struct_end;
1731 out:
1732 return ret;
1733
1734 e_inval:
1735 ret = -EINVAL;
1736 goto out;
1737 }
1738
1739 static void complete_request(struct ceph_osd_request *req)
1740 {
1741 complete_all(&req->r_safe_completion); /* fsync waiter */
1742 }
1743
1744 /*
1745 * handle osd op reply. either call the callback if it is specified,
1746 * or do the completion to wake up the waiting thread.
1747 */
1748 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1749 struct ceph_connection *con)
1750 {
1751 void *p, *end;
1752 struct ceph_osd_request *req;
1753 struct ceph_request_redirect redir;
1754 u64 tid;
1755 int object_len;
1756 unsigned int numops;
1757 int payload_len, flags;
1758 s32 result;
1759 s32 retry_attempt;
1760 struct ceph_pg pg;
1761 int err;
1762 u32 reassert_epoch;
1763 u64 reassert_version;
1764 u32 osdmap_epoch;
1765 int already_completed;
1766 u32 bytes;
1767 unsigned int i;
1768
1769 tid = le64_to_cpu(msg->hdr.tid);
1770 dout("handle_reply %p tid %llu\n", msg, tid);
1771
1772 p = msg->front.iov_base;
1773 end = p + msg->front.iov_len;
1774
1775 ceph_decode_need(&p, end, 4, bad);
1776 object_len = ceph_decode_32(&p);
1777 ceph_decode_need(&p, end, object_len, bad);
1778 p += object_len;
1779
1780 err = ceph_decode_pgid(&p, end, &pg);
1781 if (err)
1782 goto bad;
1783
1784 ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1785 flags = ceph_decode_64(&p);
1786 result = ceph_decode_32(&p);
1787 reassert_epoch = ceph_decode_32(&p);
1788 reassert_version = ceph_decode_64(&p);
1789 osdmap_epoch = ceph_decode_32(&p);
1790
1791 /* lookup */
1792 down_read(&osdc->map_sem);
1793 mutex_lock(&osdc->request_mutex);
1794 req = __lookup_request(osdc, tid);
1795 if (req == NULL) {
1796 dout("handle_reply tid %llu dne\n", tid);
1797 goto bad_mutex;
1798 }
1799 ceph_osdc_get_request(req);
1800
1801 dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1802 req, result);
1803
1804 ceph_decode_need(&p, end, 4, bad_put);
1805 numops = ceph_decode_32(&p);
1806 if (numops > CEPH_OSD_MAX_OP)
1807 goto bad_put;
1808 if (numops != req->r_num_ops)
1809 goto bad_put;
1810 payload_len = 0;
1811 ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1812 for (i = 0; i < numops; i++) {
1813 struct ceph_osd_op *op = p;
1814 int len;
1815
1816 len = le32_to_cpu(op->payload_len);
1817 req->r_reply_op_len[i] = len;
1818 dout(" op %d has %d bytes\n", i, len);
1819 payload_len += len;
1820 p += sizeof(*op);
1821 }
1822 bytes = le32_to_cpu(msg->hdr.data_len);
1823 if (payload_len != bytes) {
1824 pr_warn("sum of op payload lens %d != data_len %d\n",
1825 payload_len, bytes);
1826 goto bad_put;
1827 }
1828
1829 ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1830 retry_attempt = ceph_decode_32(&p);
1831 for (i = 0; i < numops; i++)
1832 req->r_reply_op_result[i] = ceph_decode_32(&p);
1833
1834 if (le16_to_cpu(msg->hdr.version) >= 6) {
1835 p += 8 + 4; /* skip replay_version */
1836 p += 8; /* skip user_version */
1837
1838 err = ceph_redirect_decode(&p, end, &redir);
1839 if (err)
1840 goto bad_put;
1841 } else {
1842 redir.oloc.pool = -1;
1843 }
1844
1845 if (redir.oloc.pool != -1) {
1846 dout("redirect pool %lld\n", redir.oloc.pool);
1847
1848 __unregister_request(osdc, req);
1849
1850 req->r_target_oloc = redir.oloc; /* struct */
1851
1852 /*
1853 * Start redirect requests with nofail=true. If
1854 * mapping fails, request will end up on the notarget
1855 * list, waiting for the new osdmap (which can take
1856 * a while), even though the original request mapped
1857 * successfully. In the future we might want to follow
1858 * original request's nofail setting here.
1859 */
1860 err = __ceph_osdc_start_request(osdc, req, true);
1861 BUG_ON(err);
1862
1863 goto out_unlock;
1864 }
1865
1866 already_completed = req->r_got_reply;
1867 if (!req->r_got_reply) {
1868 req->r_result = result;
1869 dout("handle_reply result %d bytes %d\n", req->r_result,
1870 bytes);
1871 if (req->r_result == 0)
1872 req->r_result = bytes;
1873
1874 /* in case this is a write and we need to replay, */
1875 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1876 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1877
1878 req->r_got_reply = 1;
1879 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1880 dout("handle_reply tid %llu dup ack\n", tid);
1881 goto out_unlock;
1882 }
1883
1884 dout("handle_reply tid %llu flags %d\n", tid, flags);
1885
1886 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1887 __register_linger_request(osdc, req);
1888
1889 /* either this is a read, or we got the safe response */
1890 if (result < 0 ||
1891 (flags & CEPH_OSD_FLAG_ONDISK) ||
1892 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1893 __unregister_request(osdc, req);
1894
1895 mutex_unlock(&osdc->request_mutex);
1896 up_read(&osdc->map_sem);
1897
1898 if (!already_completed) {
1899 if (req->r_unsafe_callback &&
1900 result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1901 req->r_unsafe_callback(req, true);
1902 if (req->r_callback)
1903 req->r_callback(req, msg);
1904 else
1905 complete_all(&req->r_completion);
1906 }
1907
1908 if (flags & CEPH_OSD_FLAG_ONDISK) {
1909 if (req->r_unsafe_callback && already_completed)
1910 req->r_unsafe_callback(req, false);
1911 complete_request(req);
1912 }
1913
1914 out:
1915 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1916 ceph_osdc_put_request(req);
1917 return;
1918 out_unlock:
1919 mutex_unlock(&osdc->request_mutex);
1920 up_read(&osdc->map_sem);
1921 goto out;
1922
1923 bad_put:
1924 req->r_result = -EIO;
1925 __unregister_request(osdc, req);
1926 if (req->r_callback)
1927 req->r_callback(req, msg);
1928 else
1929 complete_all(&req->r_completion);
1930 complete_request(req);
1931 ceph_osdc_put_request(req);
1932 bad_mutex:
1933 mutex_unlock(&osdc->request_mutex);
1934 up_read(&osdc->map_sem);
1935 bad:
1936 pr_err("corrupt osd_op_reply got %d %d\n",
1937 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1938 ceph_msg_dump(msg);
1939 }
1940
1941 static void reset_changed_osds(struct ceph_osd_client *osdc)
1942 {
1943 struct rb_node *p, *n;
1944
1945 dout("%s %p\n", __func__, osdc);
1946 for (p = rb_first(&osdc->osds); p; p = n) {
1947 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1948
1949 n = rb_next(p);
1950 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1951 memcmp(&osd->o_con.peer_addr,
1952 ceph_osd_addr(osdc->osdmap,
1953 osd->o_osd),
1954 sizeof(struct ceph_entity_addr)) != 0)
1955 __reset_osd(osdc, osd);
1956 }
1957 }
1958
1959 /*
1960 * Requeue requests whose mapping to an OSD has changed. If requests map to
1961 * no osd, request a new map.
1962 *
1963 * Caller should hold map_sem for read.
1964 */
1965 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1966 bool force_resend_writes)
1967 {
1968 struct ceph_osd_request *req, *nreq;
1969 struct rb_node *p;
1970 int needmap = 0;
1971 int err;
1972 bool force_resend_req;
1973
1974 dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1975 force_resend_writes ? " (force resend writes)" : "");
1976 mutex_lock(&osdc->request_mutex);
1977 for (p = rb_first(&osdc->requests); p; ) {
1978 req = rb_entry(p, struct ceph_osd_request, r_node);
1979 p = rb_next(p);
1980
1981 /*
1982 * For linger requests that have not yet been
1983 * registered, move them to the linger list; they'll
1984 * be sent to the osd in the loop below. Unregister
1985 * the request before re-registering it as a linger
1986 * request to ensure the __map_request() below
1987 * will decide it needs to be sent.
1988 */
1989 if (req->r_linger && list_empty(&req->r_linger_item)) {
1990 dout("%p tid %llu restart on osd%d\n",
1991 req, req->r_tid,
1992 req->r_osd ? req->r_osd->o_osd : -1);
1993 ceph_osdc_get_request(req);
1994 __unregister_request(osdc, req);
1995 __register_linger_request(osdc, req);
1996 ceph_osdc_put_request(req);
1997 continue;
1998 }
1999
2000 force_resend_req = force_resend ||
2001 (force_resend_writes &&
2002 req->r_flags & CEPH_OSD_FLAG_WRITE);
2003 err = __map_request(osdc, req, force_resend_req);
2004 if (err < 0)
2005 continue; /* error */
2006 if (req->r_osd == NULL) {
2007 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2008 needmap++; /* request a newer map */
2009 } else if (err > 0) {
2010 if (!req->r_linger) {
2011 dout("%p tid %llu requeued on osd%d\n", req,
2012 req->r_tid,
2013 req->r_osd ? req->r_osd->o_osd : -1);
2014 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2015 }
2016 }
2017 }
2018
2019 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2020 r_linger_item) {
2021 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2022
2023 err = __map_request(osdc, req,
2024 force_resend || force_resend_writes);
2025 dout("__map_request returned %d\n", err);
2026 if (err < 0)
2027 continue; /* hrm! */
2028 if (req->r_osd == NULL || err > 0) {
2029 if (req->r_osd == NULL) {
2030 dout("lingering %p tid %llu maps to no osd\n",
2031 req, req->r_tid);
2032 /*
2033 * A homeless lingering request makes
2034 * no sense, as it's job is to keep
2035 * a particular OSD connection open.
2036 * Request a newer map and kick the
2037 * request, knowing that it won't be
2038 * resent until we actually get a map
2039 * that can tell us where to send it.
2040 */
2041 needmap++;
2042 }
2043
2044 dout("kicking lingering %p tid %llu osd%d\n", req,
2045 req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2046 __register_request(osdc, req);
2047 __unregister_linger_request(osdc, req);
2048 }
2049 }
2050 reset_changed_osds(osdc);
2051 mutex_unlock(&osdc->request_mutex);
2052
2053 if (needmap) {
2054 dout("%d requests for down osds, need new map\n", needmap);
2055 ceph_monc_request_next_osdmap(&osdc->client->monc);
2056 }
2057 }
2058
2059
2060 /*
2061 * Process updated osd map.
2062 *
2063 * The message contains any number of incremental and full maps, normally
2064 * indicating some sort of topology change in the cluster. Kick requests
2065 * off to different OSDs as needed.
2066 */
2067 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2068 {
2069 void *p, *end, *next;
2070 u32 nr_maps, maplen;
2071 u32 epoch;
2072 struct ceph_osdmap *newmap = NULL, *oldmap;
2073 int err;
2074 struct ceph_fsid fsid;
2075 bool was_full;
2076
2077 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2078 p = msg->front.iov_base;
2079 end = p + msg->front.iov_len;
2080
2081 /* verify fsid */
2082 ceph_decode_need(&p, end, sizeof(fsid), bad);
2083 ceph_decode_copy(&p, &fsid, sizeof(fsid));
2084 if (ceph_check_fsid(osdc->client, &fsid) < 0)
2085 return;
2086
2087 down_write(&osdc->map_sem);
2088
2089 was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2090
2091 /* incremental maps */
2092 ceph_decode_32_safe(&p, end, nr_maps, bad);
2093 dout(" %d inc maps\n", nr_maps);
2094 while (nr_maps > 0) {
2095 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2096 epoch = ceph_decode_32(&p);
2097 maplen = ceph_decode_32(&p);
2098 ceph_decode_need(&p, end, maplen, bad);
2099 next = p + maplen;
2100 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2101 dout("applying incremental map %u len %d\n",
2102 epoch, maplen);
2103 newmap = osdmap_apply_incremental(&p, next,
2104 osdc->osdmap,
2105 &osdc->client->msgr);
2106 if (IS_ERR(newmap)) {
2107 err = PTR_ERR(newmap);
2108 goto bad;
2109 }
2110 BUG_ON(!newmap);
2111 if (newmap != osdc->osdmap) {
2112 ceph_osdmap_destroy(osdc->osdmap);
2113 osdc->osdmap = newmap;
2114 }
2115 was_full = was_full ||
2116 ceph_osdmap_flag(osdc->osdmap,
2117 CEPH_OSDMAP_FULL);
2118 kick_requests(osdc, 0, was_full);
2119 } else {
2120 dout("ignoring incremental map %u len %d\n",
2121 epoch, maplen);
2122 }
2123 p = next;
2124 nr_maps--;
2125 }
2126 if (newmap)
2127 goto done;
2128
2129 /* full maps */
2130 ceph_decode_32_safe(&p, end, nr_maps, bad);
2131 dout(" %d full maps\n", nr_maps);
2132 while (nr_maps) {
2133 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2134 epoch = ceph_decode_32(&p);
2135 maplen = ceph_decode_32(&p);
2136 ceph_decode_need(&p, end, maplen, bad);
2137 if (nr_maps > 1) {
2138 dout("skipping non-latest full map %u len %d\n",
2139 epoch, maplen);
2140 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2141 dout("skipping full map %u len %d, "
2142 "older than our %u\n", epoch, maplen,
2143 osdc->osdmap->epoch);
2144 } else {
2145 int skipped_map = 0;
2146
2147 dout("taking full map %u len %d\n", epoch, maplen);
2148 newmap = ceph_osdmap_decode(&p, p+maplen);
2149 if (IS_ERR(newmap)) {
2150 err = PTR_ERR(newmap);
2151 goto bad;
2152 }
2153 BUG_ON(!newmap);
2154 oldmap = osdc->osdmap;
2155 osdc->osdmap = newmap;
2156 if (oldmap) {
2157 if (oldmap->epoch + 1 < newmap->epoch)
2158 skipped_map = 1;
2159 ceph_osdmap_destroy(oldmap);
2160 }
2161 was_full = was_full ||
2162 ceph_osdmap_flag(osdc->osdmap,
2163 CEPH_OSDMAP_FULL);
2164 kick_requests(osdc, skipped_map, was_full);
2165 }
2166 p += maplen;
2167 nr_maps--;
2168 }
2169
2170 if (!osdc->osdmap)
2171 goto bad;
2172 done:
2173 downgrade_write(&osdc->map_sem);
2174 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2175
2176 /*
2177 * subscribe to subsequent osdmap updates if full to ensure
2178 * we find out when we are no longer full and stop returning
2179 * ENOSPC.
2180 */
2181 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2182 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2183 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2184 ceph_monc_request_next_osdmap(&osdc->client->monc);
2185
2186 mutex_lock(&osdc->request_mutex);
2187 __send_queued(osdc);
2188 mutex_unlock(&osdc->request_mutex);
2189 up_read(&osdc->map_sem);
2190 wake_up_all(&osdc->client->auth_wq);
2191 return;
2192
2193 bad:
2194 pr_err("osdc handle_map corrupt msg\n");
2195 ceph_msg_dump(msg);
2196 up_write(&osdc->map_sem);
2197 }
2198
2199 /*
2200 * watch/notify callback event infrastructure
2201 *
2202 * These callbacks are used both for watch and notify operations.
2203 */
2204 static void __release_event(struct kref *kref)
2205 {
2206 struct ceph_osd_event *event =
2207 container_of(kref, struct ceph_osd_event, kref);
2208
2209 dout("__release_event %p\n", event);
2210 kfree(event);
2211 }
2212
2213 static void get_event(struct ceph_osd_event *event)
2214 {
2215 kref_get(&event->kref);
2216 }
2217
2218 void ceph_osdc_put_event(struct ceph_osd_event *event)
2219 {
2220 kref_put(&event->kref, __release_event);
2221 }
2222 EXPORT_SYMBOL(ceph_osdc_put_event);
2223
2224 static void __insert_event(struct ceph_osd_client *osdc,
2225 struct ceph_osd_event *new)
2226 {
2227 struct rb_node **p = &osdc->event_tree.rb_node;
2228 struct rb_node *parent = NULL;
2229 struct ceph_osd_event *event = NULL;
2230
2231 while (*p) {
2232 parent = *p;
2233 event = rb_entry(parent, struct ceph_osd_event, node);
2234 if (new->cookie < event->cookie)
2235 p = &(*p)->rb_left;
2236 else if (new->cookie > event->cookie)
2237 p = &(*p)->rb_right;
2238 else
2239 BUG();
2240 }
2241
2242 rb_link_node(&new->node, parent, p);
2243 rb_insert_color(&new->node, &osdc->event_tree);
2244 }
2245
2246 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2247 u64 cookie)
2248 {
2249 struct rb_node **p = &osdc->event_tree.rb_node;
2250 struct rb_node *parent = NULL;
2251 struct ceph_osd_event *event = NULL;
2252
2253 while (*p) {
2254 parent = *p;
2255 event = rb_entry(parent, struct ceph_osd_event, node);
2256 if (cookie < event->cookie)
2257 p = &(*p)->rb_left;
2258 else if (cookie > event->cookie)
2259 p = &(*p)->rb_right;
2260 else
2261 return event;
2262 }
2263 return NULL;
2264 }
2265
2266 static void __remove_event(struct ceph_osd_event *event)
2267 {
2268 struct ceph_osd_client *osdc = event->osdc;
2269
2270 if (!RB_EMPTY_NODE(&event->node)) {
2271 dout("__remove_event removed %p\n", event);
2272 rb_erase(&event->node, &osdc->event_tree);
2273 ceph_osdc_put_event(event);
2274 } else {
2275 dout("__remove_event didn't remove %p\n", event);
2276 }
2277 }
2278
2279 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2280 void (*event_cb)(u64, u64, u8, void *),
2281 void *data, struct ceph_osd_event **pevent)
2282 {
2283 struct ceph_osd_event *event;
2284
2285 event = kmalloc(sizeof(*event), GFP_NOIO);
2286 if (!event)
2287 return -ENOMEM;
2288
2289 dout("create_event %p\n", event);
2290 event->cb = event_cb;
2291 event->one_shot = 0;
2292 event->data = data;
2293 event->osdc = osdc;
2294 INIT_LIST_HEAD(&event->osd_node);
2295 RB_CLEAR_NODE(&event->node);
2296 kref_init(&event->kref); /* one ref for us */
2297 kref_get(&event->kref); /* one ref for the caller */
2298
2299 spin_lock(&osdc->event_lock);
2300 event->cookie = ++osdc->event_count;
2301 __insert_event(osdc, event);
2302 spin_unlock(&osdc->event_lock);
2303
2304 *pevent = event;
2305 return 0;
2306 }
2307 EXPORT_SYMBOL(ceph_osdc_create_event);
2308
2309 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2310 {
2311 struct ceph_osd_client *osdc = event->osdc;
2312
2313 dout("cancel_event %p\n", event);
2314 spin_lock(&osdc->event_lock);
2315 __remove_event(event);
2316 spin_unlock(&osdc->event_lock);
2317 ceph_osdc_put_event(event); /* caller's */
2318 }
2319 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2320
2321
2322 static void do_event_work(struct work_struct *work)
2323 {
2324 struct ceph_osd_event_work *event_work =
2325 container_of(work, struct ceph_osd_event_work, work);
2326 struct ceph_osd_event *event = event_work->event;
2327 u64 ver = event_work->ver;
2328 u64 notify_id = event_work->notify_id;
2329 u8 opcode = event_work->opcode;
2330
2331 dout("do_event_work completing %p\n", event);
2332 event->cb(ver, notify_id, opcode, event->data);
2333 dout("do_event_work completed %p\n", event);
2334 ceph_osdc_put_event(event);
2335 kfree(event_work);
2336 }
2337
2338
2339 /*
2340 * Process osd watch notifications
2341 */
2342 static void handle_watch_notify(struct ceph_osd_client *osdc,
2343 struct ceph_msg *msg)
2344 {
2345 void *p, *end;
2346 u8 proto_ver;
2347 u64 cookie, ver, notify_id;
2348 u8 opcode;
2349 struct ceph_osd_event *event;
2350 struct ceph_osd_event_work *event_work;
2351
2352 p = msg->front.iov_base;
2353 end = p + msg->front.iov_len;
2354
2355 ceph_decode_8_safe(&p, end, proto_ver, bad);
2356 ceph_decode_8_safe(&p, end, opcode, bad);
2357 ceph_decode_64_safe(&p, end, cookie, bad);
2358 ceph_decode_64_safe(&p, end, ver, bad);
2359 ceph_decode_64_safe(&p, end, notify_id, bad);
2360
2361 spin_lock(&osdc->event_lock);
2362 event = __find_event(osdc, cookie);
2363 if (event) {
2364 BUG_ON(event->one_shot);
2365 get_event(event);
2366 }
2367 spin_unlock(&osdc->event_lock);
2368 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2369 cookie, ver, event);
2370 if (event) {
2371 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2372 if (!event_work) {
2373 pr_err("couldn't allocate event_work\n");
2374 ceph_osdc_put_event(event);
2375 return;
2376 }
2377 INIT_WORK(&event_work->work, do_event_work);
2378 event_work->event = event;
2379 event_work->ver = ver;
2380 event_work->notify_id = notify_id;
2381 event_work->opcode = opcode;
2382
2383 queue_work(osdc->notify_wq, &event_work->work);
2384 }
2385
2386 return;
2387
2388 bad:
2389 pr_err("osdc handle_watch_notify corrupt msg\n");
2390 }
2391
2392 /*
2393 * build new request AND message
2394 *
2395 */
2396 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2397 struct ceph_snap_context *snapc, u64 snap_id,
2398 struct timespec *mtime)
2399 {
2400 struct ceph_msg *msg = req->r_request;
2401 void *p;
2402 size_t msg_size;
2403 int flags = req->r_flags;
2404 u64 data_len;
2405 unsigned int i;
2406
2407 req->r_snapid = snap_id;
2408 req->r_snapc = ceph_get_snap_context(snapc);
2409
2410 /* encode request */
2411 msg->hdr.version = cpu_to_le16(4);
2412
2413 p = msg->front.iov_base;
2414 ceph_encode_32(&p, 1); /* client_inc is always 1 */
2415 req->r_request_osdmap_epoch = p;
2416 p += 4;
2417 req->r_request_flags = p;
2418 p += 4;
2419 if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2420 ceph_encode_timespec(p, mtime);
2421 p += sizeof(struct ceph_timespec);
2422 req->r_request_reassert_version = p;
2423 p += sizeof(struct ceph_eversion); /* will get filled in */
2424
2425 /* oloc */
2426 ceph_encode_8(&p, 4);
2427 ceph_encode_8(&p, 4);
2428 ceph_encode_32(&p, 8 + 4 + 4);
2429 req->r_request_pool = p;
2430 p += 8;
2431 ceph_encode_32(&p, -1); /* preferred */
2432 ceph_encode_32(&p, 0); /* key len */
2433
2434 ceph_encode_8(&p, 1);
2435 req->r_request_pgid = p;
2436 p += 8 + 4;
2437 ceph_encode_32(&p, -1); /* preferred */
2438
2439 /* oid */
2440 ceph_encode_32(&p, req->r_base_oid.name_len);
2441 memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2442 dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2443 req->r_base_oid.name, req->r_base_oid.name_len);
2444 p += req->r_base_oid.name_len;
2445
2446 /* ops--can imply data */
2447 ceph_encode_16(&p, (u16)req->r_num_ops);
2448 data_len = 0;
2449 for (i = 0; i < req->r_num_ops; i++) {
2450 data_len += osd_req_encode_op(req, p, i);
2451 p += sizeof(struct ceph_osd_op);
2452 }
2453
2454 /* snaps */
2455 ceph_encode_64(&p, req->r_snapid);
2456 ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2457 ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2458 if (req->r_snapc) {
2459 for (i = 0; i < snapc->num_snaps; i++) {
2460 ceph_encode_64(&p, req->r_snapc->snaps[i]);
2461 }
2462 }
2463
2464 req->r_request_attempts = p;
2465 p += 4;
2466
2467 /* data */
2468 if (flags & CEPH_OSD_FLAG_WRITE) {
2469 u16 data_off;
2470
2471 /*
2472 * The header "data_off" is a hint to the receiver
2473 * allowing it to align received data into its
2474 * buffers such that there's no need to re-copy
2475 * it before writing it to disk (direct I/O).
2476 */
2477 data_off = (u16) (off & 0xffff);
2478 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2479 }
2480 req->r_request->hdr.data_len = cpu_to_le32(data_len);
2481
2482 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2483 msg_size = p - msg->front.iov_base;
2484 msg->front.iov_len = msg_size;
2485 msg->hdr.front_len = cpu_to_le32(msg_size);
2486
2487 dout("build_request msg_size was %d\n", (int)msg_size);
2488 }
2489 EXPORT_SYMBOL(ceph_osdc_build_request);
2490
2491 /*
2492 * Register request, send initial attempt.
2493 */
2494 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2495 struct ceph_osd_request *req,
2496 bool nofail)
2497 {
2498 int rc;
2499
2500 down_read(&osdc->map_sem);
2501 mutex_lock(&osdc->request_mutex);
2502
2503 rc = __ceph_osdc_start_request(osdc, req, nofail);
2504
2505 mutex_unlock(&osdc->request_mutex);
2506 up_read(&osdc->map_sem);
2507
2508 return rc;
2509 }
2510 EXPORT_SYMBOL(ceph_osdc_start_request);
2511
2512 /*
2513 * Unregister a registered request. The request is not completed (i.e.
2514 * no callbacks or wakeups) - higher layers are supposed to know what
2515 * they are canceling.
2516 */
2517 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2518 {
2519 struct ceph_osd_client *osdc = req->r_osdc;
2520
2521 mutex_lock(&osdc->request_mutex);
2522 if (req->r_linger)
2523 __unregister_linger_request(osdc, req);
2524 __unregister_request(osdc, req);
2525 mutex_unlock(&osdc->request_mutex);
2526
2527 dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2528 }
2529 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2530
2531 /*
2532 * wait for a request to complete
2533 */
2534 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2535 struct ceph_osd_request *req)
2536 {
2537 int rc;
2538
2539 dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2540
2541 rc = wait_for_completion_interruptible(&req->r_completion);
2542 if (rc < 0) {
2543 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2544 ceph_osdc_cancel_request(req);
2545 complete_request(req);
2546 return rc;
2547 }
2548
2549 dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2550 req->r_result);
2551 return req->r_result;
2552 }
2553 EXPORT_SYMBOL(ceph_osdc_wait_request);
2554
2555 /*
2556 * sync - wait for all in-flight requests to flush. avoid starvation.
2557 */
2558 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2559 {
2560 struct ceph_osd_request *req;
2561 u64 last_tid, next_tid = 0;
2562
2563 mutex_lock(&osdc->request_mutex);
2564 last_tid = osdc->last_tid;
2565 while (1) {
2566 req = __lookup_request_ge(osdc, next_tid);
2567 if (!req)
2568 break;
2569 if (req->r_tid > last_tid)
2570 break;
2571
2572 next_tid = req->r_tid + 1;
2573 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2574 continue;
2575
2576 ceph_osdc_get_request(req);
2577 mutex_unlock(&osdc->request_mutex);
2578 dout("sync waiting on tid %llu (last is %llu)\n",
2579 req->r_tid, last_tid);
2580 wait_for_completion(&req->r_safe_completion);
2581 mutex_lock(&osdc->request_mutex);
2582 ceph_osdc_put_request(req);
2583 }
2584 mutex_unlock(&osdc->request_mutex);
2585 dout("sync done (thru tid %llu)\n", last_tid);
2586 }
2587 EXPORT_SYMBOL(ceph_osdc_sync);
2588
2589 /*
2590 * Call all pending notify callbacks - for use after a watch is
2591 * unregistered, to make sure no more callbacks for it will be invoked
2592 */
2593 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2594 {
2595 flush_workqueue(osdc->notify_wq);
2596 }
2597 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2598
2599
2600 /*
2601 * init, shutdown
2602 */
2603 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2604 {
2605 int err;
2606
2607 dout("init\n");
2608 osdc->client = client;
2609 osdc->osdmap = NULL;
2610 init_rwsem(&osdc->map_sem);
2611 init_completion(&osdc->map_waiters);
2612 osdc->last_requested_map = 0;
2613 mutex_init(&osdc->request_mutex);
2614 osdc->last_tid = 0;
2615 osdc->osds = RB_ROOT;
2616 INIT_LIST_HEAD(&osdc->osd_lru);
2617 osdc->requests = RB_ROOT;
2618 INIT_LIST_HEAD(&osdc->req_lru);
2619 INIT_LIST_HEAD(&osdc->req_unsent);
2620 INIT_LIST_HEAD(&osdc->req_notarget);
2621 INIT_LIST_HEAD(&osdc->req_linger);
2622 osdc->num_requests = 0;
2623 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2624 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2625 spin_lock_init(&osdc->event_lock);
2626 osdc->event_tree = RB_ROOT;
2627 osdc->event_count = 0;
2628
2629 schedule_delayed_work(&osdc->osds_timeout_work,
2630 round_jiffies_relative(osdc->client->options->osd_idle_ttl));
2631
2632 err = -ENOMEM;
2633 osdc->req_mempool = mempool_create_kmalloc_pool(10,
2634 sizeof(struct ceph_osd_request));
2635 if (!osdc->req_mempool)
2636 goto out;
2637
2638 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2639 OSD_OP_FRONT_LEN, 10, true,
2640 "osd_op");
2641 if (err < 0)
2642 goto out_mempool;
2643 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2644 OSD_OPREPLY_FRONT_LEN, 10, true,
2645 "osd_op_reply");
2646 if (err < 0)
2647 goto out_msgpool;
2648
2649 err = -ENOMEM;
2650 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2651 if (!osdc->notify_wq)
2652 goto out_msgpool_reply;
2653
2654 return 0;
2655
2656 out_msgpool_reply:
2657 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2658 out_msgpool:
2659 ceph_msgpool_destroy(&osdc->msgpool_op);
2660 out_mempool:
2661 mempool_destroy(osdc->req_mempool);
2662 out:
2663 return err;
2664 }
2665
2666 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2667 {
2668 flush_workqueue(osdc->notify_wq);
2669 destroy_workqueue(osdc->notify_wq);
2670 cancel_delayed_work_sync(&osdc->timeout_work);
2671 cancel_delayed_work_sync(&osdc->osds_timeout_work);
2672 if (osdc->osdmap) {
2673 ceph_osdmap_destroy(osdc->osdmap);
2674 osdc->osdmap = NULL;
2675 }
2676 remove_all_osds(osdc);
2677 mempool_destroy(osdc->req_mempool);
2678 ceph_msgpool_destroy(&osdc->msgpool_op);
2679 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2680 }
2681
2682 /*
2683 * Read some contiguous pages. If we cross a stripe boundary, shorten
2684 * *plen. Return number of bytes read, or error.
2685 */
2686 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2687 struct ceph_vino vino, struct ceph_file_layout *layout,
2688 u64 off, u64 *plen,
2689 u32 truncate_seq, u64 truncate_size,
2690 struct page **pages, int num_pages, int page_align)
2691 {
2692 struct ceph_osd_request *req;
2693 int rc = 0;
2694
2695 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2696 vino.snap, off, *plen);
2697 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2698 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2699 NULL, truncate_seq, truncate_size,
2700 false);
2701 if (IS_ERR(req))
2702 return PTR_ERR(req);
2703
2704 /* it may be a short read due to an object boundary */
2705
2706 osd_req_op_extent_osd_data_pages(req, 0,
2707 pages, *plen, page_align, false, false);
2708
2709 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
2710 off, *plen, *plen, page_align);
2711
2712 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2713
2714 rc = ceph_osdc_start_request(osdc, req, false);
2715 if (!rc)
2716 rc = ceph_osdc_wait_request(osdc, req);
2717
2718 ceph_osdc_put_request(req);
2719 dout("readpages result %d\n", rc);
2720 return rc;
2721 }
2722 EXPORT_SYMBOL(ceph_osdc_readpages);
2723
2724 /*
2725 * do a synchronous write on N pages
2726 */
2727 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2728 struct ceph_file_layout *layout,
2729 struct ceph_snap_context *snapc,
2730 u64 off, u64 len,
2731 u32 truncate_seq, u64 truncate_size,
2732 struct timespec *mtime,
2733 struct page **pages, int num_pages)
2734 {
2735 struct ceph_osd_request *req;
2736 int rc = 0;
2737 int page_align = off & ~PAGE_MASK;
2738
2739 BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */
2740 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2741 CEPH_OSD_OP_WRITE,
2742 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2743 snapc, truncate_seq, truncate_size,
2744 true);
2745 if (IS_ERR(req))
2746 return PTR_ERR(req);
2747
2748 /* it may be a short write due to an object boundary */
2749 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2750 false, false);
2751 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2752
2753 ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2754
2755 rc = ceph_osdc_start_request(osdc, req, true);
2756 if (!rc)
2757 rc = ceph_osdc_wait_request(osdc, req);
2758
2759 ceph_osdc_put_request(req);
2760 if (rc == 0)
2761 rc = len;
2762 dout("writepages result %d\n", rc);
2763 return rc;
2764 }
2765 EXPORT_SYMBOL(ceph_osdc_writepages);
2766
2767 int ceph_osdc_setup(void)
2768 {
2769 BUG_ON(ceph_osd_request_cache);
2770 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2771 sizeof (struct ceph_osd_request),
2772 __alignof__(struct ceph_osd_request),
2773 0, NULL);
2774
2775 return ceph_osd_request_cache ? 0 : -ENOMEM;
2776 }
2777 EXPORT_SYMBOL(ceph_osdc_setup);
2778
2779 void ceph_osdc_cleanup(void)
2780 {
2781 BUG_ON(!ceph_osd_request_cache);
2782 kmem_cache_destroy(ceph_osd_request_cache);
2783 ceph_osd_request_cache = NULL;
2784 }
2785 EXPORT_SYMBOL(ceph_osdc_cleanup);
2786
2787 /*
2788 * handle incoming message
2789 */
2790 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2791 {
2792 struct ceph_osd *osd = con->private;
2793 struct ceph_osd_client *osdc;
2794 int type = le16_to_cpu(msg->hdr.type);
2795
2796 if (!osd)
2797 goto out;
2798 osdc = osd->o_osdc;
2799
2800 switch (type) {
2801 case CEPH_MSG_OSD_MAP:
2802 ceph_osdc_handle_map(osdc, msg);
2803 break;
2804 case CEPH_MSG_OSD_OPREPLY:
2805 handle_reply(osdc, msg, con);
2806 break;
2807 case CEPH_MSG_WATCH_NOTIFY:
2808 handle_watch_notify(osdc, msg);
2809 break;
2810
2811 default:
2812 pr_err("received unknown message type %d %s\n", type,
2813 ceph_msg_type_name(type));
2814 }
2815 out:
2816 ceph_msg_put(msg);
2817 }
2818
2819 /*
2820 * lookup and return message for incoming reply. set up reply message
2821 * pages.
2822 */
2823 static struct ceph_msg *get_reply(struct ceph_connection *con,
2824 struct ceph_msg_header *hdr,
2825 int *skip)
2826 {
2827 struct ceph_osd *osd = con->private;
2828 struct ceph_osd_client *osdc = osd->o_osdc;
2829 struct ceph_msg *m;
2830 struct ceph_osd_request *req;
2831 int front_len = le32_to_cpu(hdr->front_len);
2832 int data_len = le32_to_cpu(hdr->data_len);
2833 u64 tid;
2834
2835 tid = le64_to_cpu(hdr->tid);
2836 mutex_lock(&osdc->request_mutex);
2837 req = __lookup_request(osdc, tid);
2838 if (!req) {
2839 *skip = 1;
2840 m = NULL;
2841 dout("get_reply unknown tid %llu from osd%d\n", tid,
2842 osd->o_osd);
2843 goto out;
2844 }
2845
2846 if (req->r_reply->con)
2847 dout("%s revoking msg %p from old con %p\n", __func__,
2848 req->r_reply, req->r_reply->con);
2849 ceph_msg_revoke_incoming(req->r_reply);
2850
2851 if (front_len > req->r_reply->front_alloc_len) {
2852 pr_warn("get_reply front %d > preallocated %d (%u#%llu)\n",
2853 front_len, req->r_reply->front_alloc_len,
2854 (unsigned int)con->peer_name.type,
2855 le64_to_cpu(con->peer_name.num));
2856 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2857 false);
2858 if (!m)
2859 goto out;
2860 ceph_msg_put(req->r_reply);
2861 req->r_reply = m;
2862 }
2863 m = ceph_msg_get(req->r_reply);
2864
2865 if (data_len > 0) {
2866 struct ceph_osd_data *osd_data;
2867
2868 /*
2869 * XXX This is assuming there is only one op containing
2870 * XXX page data. Probably OK for reads, but this
2871 * XXX ought to be done more generally.
2872 */
2873 osd_data = osd_req_op_extent_osd_data(req, 0);
2874 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2875 if (osd_data->pages &&
2876 unlikely(osd_data->length < data_len)) {
2877
2878 pr_warn("tid %lld reply has %d bytes we had only %llu bytes ready\n",
2879 tid, data_len, osd_data->length);
2880 *skip = 1;
2881 ceph_msg_put(m);
2882 m = NULL;
2883 goto out;
2884 }
2885 }
2886 }
2887 *skip = 0;
2888 dout("get_reply tid %lld %p\n", tid, m);
2889
2890 out:
2891 mutex_unlock(&osdc->request_mutex);
2892 return m;
2893
2894 }
2895
2896 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2897 struct ceph_msg_header *hdr,
2898 int *skip)
2899 {
2900 struct ceph_osd *osd = con->private;
2901 int type = le16_to_cpu(hdr->type);
2902 int front = le32_to_cpu(hdr->front_len);
2903
2904 *skip = 0;
2905 switch (type) {
2906 case CEPH_MSG_OSD_MAP:
2907 case CEPH_MSG_WATCH_NOTIFY:
2908 return ceph_msg_new(type, front, GFP_NOFS, false);
2909 case CEPH_MSG_OSD_OPREPLY:
2910 return get_reply(con, hdr, skip);
2911 default:
2912 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2913 osd->o_osd);
2914 *skip = 1;
2915 return NULL;
2916 }
2917 }
2918
2919 /*
2920 * Wrappers to refcount containing ceph_osd struct
2921 */
2922 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2923 {
2924 struct ceph_osd *osd = con->private;
2925 if (get_osd(osd))
2926 return con;
2927 return NULL;
2928 }
2929
2930 static void put_osd_con(struct ceph_connection *con)
2931 {
2932 struct ceph_osd *osd = con->private;
2933 put_osd(osd);
2934 }
2935
2936 /*
2937 * authentication
2938 */
2939 /*
2940 * Note: returned pointer is the address of a structure that's
2941 * managed separately. Caller must *not* attempt to free it.
2942 */
2943 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2944 int *proto, int force_new)
2945 {
2946 struct ceph_osd *o = con->private;
2947 struct ceph_osd_client *osdc = o->o_osdc;
2948 struct ceph_auth_client *ac = osdc->client->monc.auth;
2949 struct ceph_auth_handshake *auth = &o->o_auth;
2950
2951 if (force_new && auth->authorizer) {
2952 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2953 auth->authorizer = NULL;
2954 }
2955 if (!auth->authorizer) {
2956 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2957 auth);
2958 if (ret)
2959 return ERR_PTR(ret);
2960 } else {
2961 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2962 auth);
2963 if (ret)
2964 return ERR_PTR(ret);
2965 }
2966 *proto = ac->protocol;
2967
2968 return auth;
2969 }
2970
2971
2972 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2973 {
2974 struct ceph_osd *o = con->private;
2975 struct ceph_osd_client *osdc = o->o_osdc;
2976 struct ceph_auth_client *ac = osdc->client->monc.auth;
2977
2978 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2979 }
2980
2981 static int invalidate_authorizer(struct ceph_connection *con)
2982 {
2983 struct ceph_osd *o = con->private;
2984 struct ceph_osd_client *osdc = o->o_osdc;
2985 struct ceph_auth_client *ac = osdc->client->monc.auth;
2986
2987 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2988 return ceph_monc_validate_auth(&osdc->client->monc);
2989 }
2990
2991 static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
2992 {
2993 struct ceph_osd *o = con->private;
2994 struct ceph_auth_handshake *auth = &o->o_auth;
2995 return ceph_auth_sign_message(auth, msg);
2996 }
2997
2998 static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
2999 {
3000 struct ceph_osd *o = con->private;
3001 struct ceph_auth_handshake *auth = &o->o_auth;
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 = sign_message,
3014 .check_message_signature = check_message_signature,
3015 .fault = osd_reset,
3016 };
Linux with added FPC-III support