xref: /openbmc/linux/net/ceph/osd_client.c (revision f35e839a)
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_linger_request(struct ceph_osd_client *osdc,
34 					struct ceph_osd_request *req);
35 static void __send_request(struct ceph_osd_client *osdc,
36 			   struct ceph_osd_request *req);
37 
38 /*
39  * Implement client access to distributed object storage cluster.
40  *
41  * All data objects are stored within a cluster/cloud of OSDs, or
42  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
43  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
44  * remote daemons serving up and coordinating consistent and safe
45  * access to storage.
46  *
47  * Cluster membership and the mapping of data objects onto storage devices
48  * are described by the osd map.
49  *
50  * We keep track of pending OSD requests (read, write), resubmit
51  * requests to different OSDs when the cluster topology/data layout
52  * change, or retry the affected requests when the communications
53  * channel with an OSD is reset.
54  */
55 
56 /*
57  * calculate the mapping of a file extent onto an object, and fill out the
58  * request accordingly.  shorten extent as necessary if it crosses an
59  * object boundary.
60  *
61  * fill osd op in request message.
62  */
63 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
64 			u64 *objnum, u64 *objoff, u64 *objlen)
65 {
66 	u64 orig_len = *plen;
67 	int r;
68 
69 	/* object extent? */
70 	r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
71 					  objoff, objlen);
72 	if (r < 0)
73 		return r;
74 	if (*objlen < orig_len) {
75 		*plen = *objlen;
76 		dout(" skipping last %llu, final file extent %llu~%llu\n",
77 		     orig_len - *plen, off, *plen);
78 	}
79 
80 	dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
81 
82 	return 0;
83 }
84 
85 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
86 {
87 	memset(osd_data, 0, sizeof (*osd_data));
88 	osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
89 }
90 
91 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
92 			struct page **pages, u64 length, u32 alignment,
93 			bool pages_from_pool, bool own_pages)
94 {
95 	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
96 	osd_data->pages = pages;
97 	osd_data->length = length;
98 	osd_data->alignment = alignment;
99 	osd_data->pages_from_pool = pages_from_pool;
100 	osd_data->own_pages = own_pages;
101 }
102 
103 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
104 			struct ceph_pagelist *pagelist)
105 {
106 	osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
107 	osd_data->pagelist = pagelist;
108 }
109 
110 #ifdef CONFIG_BLOCK
111 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
112 			struct bio *bio, size_t bio_length)
113 {
114 	osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
115 	osd_data->bio = bio;
116 	osd_data->bio_length = bio_length;
117 }
118 #endif /* CONFIG_BLOCK */
119 
120 #define osd_req_op_data(oreq, whch, typ, fld)	\
121 	({						\
122 		BUG_ON(whch >= (oreq)->r_num_ops);	\
123 		&(oreq)->r_ops[whch].typ.fld;		\
124 	})
125 
126 static struct ceph_osd_data *
127 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
128 {
129 	BUG_ON(which >= osd_req->r_num_ops);
130 
131 	return &osd_req->r_ops[which].raw_data_in;
132 }
133 
134 struct ceph_osd_data *
135 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
136 			unsigned int which)
137 {
138 	return osd_req_op_data(osd_req, which, extent, osd_data);
139 }
140 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
141 
142 struct ceph_osd_data *
143 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
144 			unsigned int which)
145 {
146 	return osd_req_op_data(osd_req, which, cls, response_data);
147 }
148 EXPORT_SYMBOL(osd_req_op_cls_response_data);	/* ??? */
149 
150 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
151 			unsigned int which, struct page **pages,
152 			u64 length, u32 alignment,
153 			bool pages_from_pool, bool own_pages)
154 {
155 	struct ceph_osd_data *osd_data;
156 
157 	osd_data = osd_req_op_raw_data_in(osd_req, which);
158 	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
159 				pages_from_pool, own_pages);
160 }
161 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
162 
163 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
164 			unsigned int which, struct page **pages,
165 			u64 length, u32 alignment,
166 			bool pages_from_pool, bool own_pages)
167 {
168 	struct ceph_osd_data *osd_data;
169 
170 	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
171 	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
172 				pages_from_pool, own_pages);
173 }
174 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
175 
176 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
177 			unsigned int which, struct ceph_pagelist *pagelist)
178 {
179 	struct ceph_osd_data *osd_data;
180 
181 	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
182 	ceph_osd_data_pagelist_init(osd_data, pagelist);
183 }
184 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
185 
186 #ifdef CONFIG_BLOCK
187 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
188 			unsigned int which, struct bio *bio, size_t bio_length)
189 {
190 	struct ceph_osd_data *osd_data;
191 
192 	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
193 	ceph_osd_data_bio_init(osd_data, bio, bio_length);
194 }
195 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
196 #endif /* CONFIG_BLOCK */
197 
198 static void osd_req_op_cls_request_info_pagelist(
199 			struct ceph_osd_request *osd_req,
200 			unsigned int which, struct ceph_pagelist *pagelist)
201 {
202 	struct ceph_osd_data *osd_data;
203 
204 	osd_data = osd_req_op_data(osd_req, which, cls, request_info);
205 	ceph_osd_data_pagelist_init(osd_data, pagelist);
206 }
207 
208 void osd_req_op_cls_request_data_pagelist(
209 			struct ceph_osd_request *osd_req,
210 			unsigned int which, struct ceph_pagelist *pagelist)
211 {
212 	struct ceph_osd_data *osd_data;
213 
214 	osd_data = osd_req_op_data(osd_req, which, cls, request_data);
215 	ceph_osd_data_pagelist_init(osd_data, pagelist);
216 }
217 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
218 
219 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
220 			unsigned int which, struct page **pages, u64 length,
221 			u32 alignment, bool pages_from_pool, bool own_pages)
222 {
223 	struct ceph_osd_data *osd_data;
224 
225 	osd_data = osd_req_op_data(osd_req, which, cls, request_data);
226 	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
227 				pages_from_pool, own_pages);
228 }
229 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
230 
231 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
232 			unsigned int which, struct page **pages, u64 length,
233 			u32 alignment, bool pages_from_pool, bool own_pages)
234 {
235 	struct ceph_osd_data *osd_data;
236 
237 	osd_data = osd_req_op_data(osd_req, which, cls, response_data);
238 	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
239 				pages_from_pool, own_pages);
240 }
241 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
242 
243 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
244 {
245 	switch (osd_data->type) {
246 	case CEPH_OSD_DATA_TYPE_NONE:
247 		return 0;
248 	case CEPH_OSD_DATA_TYPE_PAGES:
249 		return osd_data->length;
250 	case CEPH_OSD_DATA_TYPE_PAGELIST:
251 		return (u64)osd_data->pagelist->length;
252 #ifdef CONFIG_BLOCK
253 	case CEPH_OSD_DATA_TYPE_BIO:
254 		return (u64)osd_data->bio_length;
255 #endif /* CONFIG_BLOCK */
256 	default:
257 		WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
258 		return 0;
259 	}
260 }
261 
262 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
263 {
264 	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
265 		int num_pages;
266 
267 		num_pages = calc_pages_for((u64)osd_data->alignment,
268 						(u64)osd_data->length);
269 		ceph_release_page_vector(osd_data->pages, num_pages);
270 	}
271 	ceph_osd_data_init(osd_data);
272 }
273 
274 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
275 			unsigned int which)
276 {
277 	struct ceph_osd_req_op *op;
278 
279 	BUG_ON(which >= osd_req->r_num_ops);
280 	op = &osd_req->r_ops[which];
281 
282 	switch (op->op) {
283 	case CEPH_OSD_OP_READ:
284 	case CEPH_OSD_OP_WRITE:
285 		ceph_osd_data_release(&op->extent.osd_data);
286 		break;
287 	case CEPH_OSD_OP_CALL:
288 		ceph_osd_data_release(&op->cls.request_info);
289 		ceph_osd_data_release(&op->cls.request_data);
290 		ceph_osd_data_release(&op->cls.response_data);
291 		break;
292 	default:
293 		break;
294 	}
295 }
296 
297 /*
298  * requests
299  */
300 void ceph_osdc_release_request(struct kref *kref)
301 {
302 	struct ceph_osd_request *req;
303 	unsigned int which;
304 
305 	req = container_of(kref, struct ceph_osd_request, r_kref);
306 	if (req->r_request)
307 		ceph_msg_put(req->r_request);
308 	if (req->r_reply) {
309 		ceph_msg_revoke_incoming(req->r_reply);
310 		ceph_msg_put(req->r_reply);
311 	}
312 
313 	for (which = 0; which < req->r_num_ops; which++)
314 		osd_req_op_data_release(req, which);
315 
316 	ceph_put_snap_context(req->r_snapc);
317 	if (req->r_mempool)
318 		mempool_free(req, req->r_osdc->req_mempool);
319 	else
320 		kmem_cache_free(ceph_osd_request_cache, req);
321 
322 }
323 EXPORT_SYMBOL(ceph_osdc_release_request);
324 
325 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
326 					       struct ceph_snap_context *snapc,
327 					       unsigned int num_ops,
328 					       bool use_mempool,
329 					       gfp_t gfp_flags)
330 {
331 	struct ceph_osd_request *req;
332 	struct ceph_msg *msg;
333 	size_t msg_size;
334 
335 	BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
336 	BUG_ON(num_ops > CEPH_OSD_MAX_OP);
337 
338 	msg_size = 4 + 4 + 8 + 8 + 4+8;
339 	msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
340 	msg_size += 1 + 8 + 4 + 4;     /* pg_t */
341 	msg_size += 4 + MAX_OBJ_NAME_SIZE;
342 	msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
343 	msg_size += 8;  /* snapid */
344 	msg_size += 8;  /* snap_seq */
345 	msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
346 	msg_size += 4;
347 
348 	if (use_mempool) {
349 		req = mempool_alloc(osdc->req_mempool, gfp_flags);
350 		memset(req, 0, sizeof(*req));
351 	} else {
352 		req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
353 	}
354 	if (req == NULL)
355 		return NULL;
356 
357 	req->r_osdc = osdc;
358 	req->r_mempool = use_mempool;
359 	req->r_num_ops = num_ops;
360 
361 	kref_init(&req->r_kref);
362 	init_completion(&req->r_completion);
363 	init_completion(&req->r_safe_completion);
364 	RB_CLEAR_NODE(&req->r_node);
365 	INIT_LIST_HEAD(&req->r_unsafe_item);
366 	INIT_LIST_HEAD(&req->r_linger_item);
367 	INIT_LIST_HEAD(&req->r_linger_osd);
368 	INIT_LIST_HEAD(&req->r_req_lru_item);
369 	INIT_LIST_HEAD(&req->r_osd_item);
370 
371 	/* create reply message */
372 	if (use_mempool)
373 		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
374 	else
375 		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
376 				   OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
377 	if (!msg) {
378 		ceph_osdc_put_request(req);
379 		return NULL;
380 	}
381 	req->r_reply = msg;
382 
383 	/* create request message; allow space for oid */
384 	if (use_mempool)
385 		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
386 	else
387 		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
388 	if (!msg) {
389 		ceph_osdc_put_request(req);
390 		return NULL;
391 	}
392 
393 	memset(msg->front.iov_base, 0, msg->front.iov_len);
394 
395 	req->r_request = msg;
396 
397 	return req;
398 }
399 EXPORT_SYMBOL(ceph_osdc_alloc_request);
400 
401 static bool osd_req_opcode_valid(u16 opcode)
402 {
403 	switch (opcode) {
404 	case CEPH_OSD_OP_READ:
405 	case CEPH_OSD_OP_STAT:
406 	case CEPH_OSD_OP_MAPEXT:
407 	case CEPH_OSD_OP_MASKTRUNC:
408 	case CEPH_OSD_OP_SPARSE_READ:
409 	case CEPH_OSD_OP_NOTIFY:
410 	case CEPH_OSD_OP_NOTIFY_ACK:
411 	case CEPH_OSD_OP_ASSERT_VER:
412 	case CEPH_OSD_OP_WRITE:
413 	case CEPH_OSD_OP_WRITEFULL:
414 	case CEPH_OSD_OP_TRUNCATE:
415 	case CEPH_OSD_OP_ZERO:
416 	case CEPH_OSD_OP_DELETE:
417 	case CEPH_OSD_OP_APPEND:
418 	case CEPH_OSD_OP_STARTSYNC:
419 	case CEPH_OSD_OP_SETTRUNC:
420 	case CEPH_OSD_OP_TRIMTRUNC:
421 	case CEPH_OSD_OP_TMAPUP:
422 	case CEPH_OSD_OP_TMAPPUT:
423 	case CEPH_OSD_OP_TMAPGET:
424 	case CEPH_OSD_OP_CREATE:
425 	case CEPH_OSD_OP_ROLLBACK:
426 	case CEPH_OSD_OP_WATCH:
427 	case CEPH_OSD_OP_OMAPGETKEYS:
428 	case CEPH_OSD_OP_OMAPGETVALS:
429 	case CEPH_OSD_OP_OMAPGETHEADER:
430 	case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
431 	case CEPH_OSD_OP_OMAPSETVALS:
432 	case CEPH_OSD_OP_OMAPSETHEADER:
433 	case CEPH_OSD_OP_OMAPCLEAR:
434 	case CEPH_OSD_OP_OMAPRMKEYS:
435 	case CEPH_OSD_OP_OMAP_CMP:
436 	case CEPH_OSD_OP_CLONERANGE:
437 	case CEPH_OSD_OP_ASSERT_SRC_VERSION:
438 	case CEPH_OSD_OP_SRC_CMPXATTR:
439 	case CEPH_OSD_OP_GETXATTR:
440 	case CEPH_OSD_OP_GETXATTRS:
441 	case CEPH_OSD_OP_CMPXATTR:
442 	case CEPH_OSD_OP_SETXATTR:
443 	case CEPH_OSD_OP_SETXATTRS:
444 	case CEPH_OSD_OP_RESETXATTRS:
445 	case CEPH_OSD_OP_RMXATTR:
446 	case CEPH_OSD_OP_PULL:
447 	case CEPH_OSD_OP_PUSH:
448 	case CEPH_OSD_OP_BALANCEREADS:
449 	case CEPH_OSD_OP_UNBALANCEREADS:
450 	case CEPH_OSD_OP_SCRUB:
451 	case CEPH_OSD_OP_SCRUB_RESERVE:
452 	case CEPH_OSD_OP_SCRUB_UNRESERVE:
453 	case CEPH_OSD_OP_SCRUB_STOP:
454 	case CEPH_OSD_OP_SCRUB_MAP:
455 	case CEPH_OSD_OP_WRLOCK:
456 	case CEPH_OSD_OP_WRUNLOCK:
457 	case CEPH_OSD_OP_RDLOCK:
458 	case CEPH_OSD_OP_RDUNLOCK:
459 	case CEPH_OSD_OP_UPLOCK:
460 	case CEPH_OSD_OP_DNLOCK:
461 	case CEPH_OSD_OP_CALL:
462 	case CEPH_OSD_OP_PGLS:
463 	case CEPH_OSD_OP_PGLS_FILTER:
464 		return true;
465 	default:
466 		return false;
467 	}
468 }
469 
470 /*
471  * This is an osd op init function for opcodes that have no data or
472  * other information associated with them.  It also serves as a
473  * common init routine for all the other init functions, below.
474  */
475 static struct ceph_osd_req_op *
476 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
477 				u16 opcode)
478 {
479 	struct ceph_osd_req_op *op;
480 
481 	BUG_ON(which >= osd_req->r_num_ops);
482 	BUG_ON(!osd_req_opcode_valid(opcode));
483 
484 	op = &osd_req->r_ops[which];
485 	memset(op, 0, sizeof (*op));
486 	op->op = opcode;
487 
488 	return op;
489 }
490 
491 void osd_req_op_init(struct ceph_osd_request *osd_req,
492 				unsigned int which, u16 opcode)
493 {
494 	(void)_osd_req_op_init(osd_req, which, opcode);
495 }
496 EXPORT_SYMBOL(osd_req_op_init);
497 
498 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
499 				unsigned int which, u16 opcode,
500 				u64 offset, u64 length,
501 				u64 truncate_size, u32 truncate_seq)
502 {
503 	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
504 	size_t payload_len = 0;
505 
506 	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
507 
508 	op->extent.offset = offset;
509 	op->extent.length = length;
510 	op->extent.truncate_size = truncate_size;
511 	op->extent.truncate_seq = truncate_seq;
512 	if (opcode == CEPH_OSD_OP_WRITE)
513 		payload_len += length;
514 
515 	op->payload_len = payload_len;
516 }
517 EXPORT_SYMBOL(osd_req_op_extent_init);
518 
519 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
520 				unsigned int which, u64 length)
521 {
522 	struct ceph_osd_req_op *op;
523 	u64 previous;
524 
525 	BUG_ON(which >= osd_req->r_num_ops);
526 	op = &osd_req->r_ops[which];
527 	previous = op->extent.length;
528 
529 	if (length == previous)
530 		return;		/* Nothing to do */
531 	BUG_ON(length > previous);
532 
533 	op->extent.length = length;
534 	op->payload_len -= previous - length;
535 }
536 EXPORT_SYMBOL(osd_req_op_extent_update);
537 
538 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
539 			u16 opcode, const char *class, const char *method)
540 {
541 	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
542 	struct ceph_pagelist *pagelist;
543 	size_t payload_len = 0;
544 	size_t size;
545 
546 	BUG_ON(opcode != CEPH_OSD_OP_CALL);
547 
548 	pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
549 	BUG_ON(!pagelist);
550 	ceph_pagelist_init(pagelist);
551 
552 	op->cls.class_name = class;
553 	size = strlen(class);
554 	BUG_ON(size > (size_t) U8_MAX);
555 	op->cls.class_len = size;
556 	ceph_pagelist_append(pagelist, class, size);
557 	payload_len += size;
558 
559 	op->cls.method_name = method;
560 	size = strlen(method);
561 	BUG_ON(size > (size_t) U8_MAX);
562 	op->cls.method_len = size;
563 	ceph_pagelist_append(pagelist, method, size);
564 	payload_len += size;
565 
566 	osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
567 
568 	op->cls.argc = 0;	/* currently unused */
569 
570 	op->payload_len = payload_len;
571 }
572 EXPORT_SYMBOL(osd_req_op_cls_init);
573 
574 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
575 				unsigned int which, u16 opcode,
576 				u64 cookie, u64 version, int flag)
577 {
578 	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
579 
580 	BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
581 
582 	op->watch.cookie = cookie;
583 	op->watch.ver = version;
584 	if (opcode == CEPH_OSD_OP_WATCH && flag)
585 		op->watch.flag = (u8)1;
586 }
587 EXPORT_SYMBOL(osd_req_op_watch_init);
588 
589 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
590 				struct ceph_osd_data *osd_data)
591 {
592 	u64 length = ceph_osd_data_length(osd_data);
593 
594 	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
595 		BUG_ON(length > (u64) SIZE_MAX);
596 		if (length)
597 			ceph_msg_data_add_pages(msg, osd_data->pages,
598 					length, osd_data->alignment);
599 	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
600 		BUG_ON(!length);
601 		ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
602 #ifdef CONFIG_BLOCK
603 	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
604 		ceph_msg_data_add_bio(msg, osd_data->bio, length);
605 #endif
606 	} else {
607 		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
608 	}
609 }
610 
611 static u64 osd_req_encode_op(struct ceph_osd_request *req,
612 			      struct ceph_osd_op *dst, unsigned int which)
613 {
614 	struct ceph_osd_req_op *src;
615 	struct ceph_osd_data *osd_data;
616 	u64 request_data_len = 0;
617 	u64 data_length;
618 
619 	BUG_ON(which >= req->r_num_ops);
620 	src = &req->r_ops[which];
621 	if (WARN_ON(!osd_req_opcode_valid(src->op))) {
622 		pr_err("unrecognized osd opcode %d\n", src->op);
623 
624 		return 0;
625 	}
626 
627 	switch (src->op) {
628 	case CEPH_OSD_OP_STAT:
629 		osd_data = &src->raw_data_in;
630 		ceph_osdc_msg_data_add(req->r_reply, osd_data);
631 		break;
632 	case CEPH_OSD_OP_READ:
633 	case CEPH_OSD_OP_WRITE:
634 		if (src->op == CEPH_OSD_OP_WRITE)
635 			request_data_len = src->extent.length;
636 		dst->extent.offset = cpu_to_le64(src->extent.offset);
637 		dst->extent.length = cpu_to_le64(src->extent.length);
638 		dst->extent.truncate_size =
639 			cpu_to_le64(src->extent.truncate_size);
640 		dst->extent.truncate_seq =
641 			cpu_to_le32(src->extent.truncate_seq);
642 		osd_data = &src->extent.osd_data;
643 		if (src->op == CEPH_OSD_OP_WRITE)
644 			ceph_osdc_msg_data_add(req->r_request, osd_data);
645 		else
646 			ceph_osdc_msg_data_add(req->r_reply, osd_data);
647 		break;
648 	case CEPH_OSD_OP_CALL:
649 		dst->cls.class_len = src->cls.class_len;
650 		dst->cls.method_len = src->cls.method_len;
651 		osd_data = &src->cls.request_info;
652 		ceph_osdc_msg_data_add(req->r_request, osd_data);
653 		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
654 		request_data_len = osd_data->pagelist->length;
655 
656 		osd_data = &src->cls.request_data;
657 		data_length = ceph_osd_data_length(osd_data);
658 		if (data_length) {
659 			BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
660 			dst->cls.indata_len = cpu_to_le32(data_length);
661 			ceph_osdc_msg_data_add(req->r_request, osd_data);
662 			src->payload_len += data_length;
663 			request_data_len += data_length;
664 		}
665 		osd_data = &src->cls.response_data;
666 		ceph_osdc_msg_data_add(req->r_reply, osd_data);
667 		break;
668 	case CEPH_OSD_OP_STARTSYNC:
669 		break;
670 	case CEPH_OSD_OP_NOTIFY_ACK:
671 	case CEPH_OSD_OP_WATCH:
672 		dst->watch.cookie = cpu_to_le64(src->watch.cookie);
673 		dst->watch.ver = cpu_to_le64(src->watch.ver);
674 		dst->watch.flag = src->watch.flag;
675 		break;
676 	default:
677 		pr_err("unsupported osd opcode %s\n",
678 			ceph_osd_op_name(src->op));
679 		WARN_ON(1);
680 
681 		return 0;
682 	}
683 	dst->op = cpu_to_le16(src->op);
684 	dst->payload_len = cpu_to_le32(src->payload_len);
685 
686 	return request_data_len;
687 }
688 
689 /*
690  * build new request AND message, calculate layout, and adjust file
691  * extent as needed.
692  *
693  * if the file was recently truncated, we include information about its
694  * old and new size so that the object can be updated appropriately.  (we
695  * avoid synchronously deleting truncated objects because it's slow.)
696  *
697  * if @do_sync, include a 'startsync' command so that the osd will flush
698  * data quickly.
699  */
700 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
701 					       struct ceph_file_layout *layout,
702 					       struct ceph_vino vino,
703 					       u64 off, u64 *plen, int num_ops,
704 					       int opcode, int flags,
705 					       struct ceph_snap_context *snapc,
706 					       u32 truncate_seq,
707 					       u64 truncate_size,
708 					       bool use_mempool)
709 {
710 	struct ceph_osd_request *req;
711 	u64 objnum = 0;
712 	u64 objoff = 0;
713 	u64 objlen = 0;
714 	u32 object_size;
715 	u64 object_base;
716 	int r;
717 
718 	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
719 
720 	req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
721 					GFP_NOFS);
722 	if (!req)
723 		return ERR_PTR(-ENOMEM);
724 
725 	req->r_flags = flags;
726 
727 	/* calculate max write size */
728 	r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
729 	if (r < 0) {
730 		ceph_osdc_put_request(req);
731 		return ERR_PTR(r);
732 	}
733 
734 	object_size = le32_to_cpu(layout->fl_object_size);
735 	object_base = off - objoff;
736 	if (truncate_size <= object_base) {
737 		truncate_size = 0;
738 	} else {
739 		truncate_size -= object_base;
740 		if (truncate_size > object_size)
741 			truncate_size = object_size;
742 	}
743 
744 	osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
745 				truncate_size, truncate_seq);
746 
747 	/*
748 	 * A second op in the ops array means the caller wants to
749 	 * also issue a include a 'startsync' command so that the
750 	 * osd will flush data quickly.
751 	 */
752 	if (num_ops > 1)
753 		osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
754 
755 	req->r_file_layout = *layout;  /* keep a copy */
756 
757 	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
758 		vino.ino, objnum);
759 	req->r_oid_len = strlen(req->r_oid);
760 
761 	return req;
762 }
763 EXPORT_SYMBOL(ceph_osdc_new_request);
764 
765 /*
766  * We keep osd requests in an rbtree, sorted by ->r_tid.
767  */
768 static void __insert_request(struct ceph_osd_client *osdc,
769 			     struct ceph_osd_request *new)
770 {
771 	struct rb_node **p = &osdc->requests.rb_node;
772 	struct rb_node *parent = NULL;
773 	struct ceph_osd_request *req = NULL;
774 
775 	while (*p) {
776 		parent = *p;
777 		req = rb_entry(parent, struct ceph_osd_request, r_node);
778 		if (new->r_tid < req->r_tid)
779 			p = &(*p)->rb_left;
780 		else if (new->r_tid > req->r_tid)
781 			p = &(*p)->rb_right;
782 		else
783 			BUG();
784 	}
785 
786 	rb_link_node(&new->r_node, parent, p);
787 	rb_insert_color(&new->r_node, &osdc->requests);
788 }
789 
790 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
791 						 u64 tid)
792 {
793 	struct ceph_osd_request *req;
794 	struct rb_node *n = osdc->requests.rb_node;
795 
796 	while (n) {
797 		req = rb_entry(n, struct ceph_osd_request, r_node);
798 		if (tid < req->r_tid)
799 			n = n->rb_left;
800 		else if (tid > req->r_tid)
801 			n = n->rb_right;
802 		else
803 			return req;
804 	}
805 	return NULL;
806 }
807 
808 static struct ceph_osd_request *
809 __lookup_request_ge(struct ceph_osd_client *osdc,
810 		    u64 tid)
811 {
812 	struct ceph_osd_request *req;
813 	struct rb_node *n = osdc->requests.rb_node;
814 
815 	while (n) {
816 		req = rb_entry(n, struct ceph_osd_request, r_node);
817 		if (tid < req->r_tid) {
818 			if (!n->rb_left)
819 				return req;
820 			n = n->rb_left;
821 		} else if (tid > req->r_tid) {
822 			n = n->rb_right;
823 		} else {
824 			return req;
825 		}
826 	}
827 	return NULL;
828 }
829 
830 /*
831  * Resubmit requests pending on the given osd.
832  */
833 static void __kick_osd_requests(struct ceph_osd_client *osdc,
834 				struct ceph_osd *osd)
835 {
836 	struct ceph_osd_request *req, *nreq;
837 	LIST_HEAD(resend);
838 	int err;
839 
840 	dout("__kick_osd_requests osd%d\n", osd->o_osd);
841 	err = __reset_osd(osdc, osd);
842 	if (err)
843 		return;
844 	/*
845 	 * Build up a list of requests to resend by traversing the
846 	 * osd's list of requests.  Requests for a given object are
847 	 * sent in tid order, and that is also the order they're
848 	 * kept on this list.  Therefore all requests that are in
849 	 * flight will be found first, followed by all requests that
850 	 * have not yet been sent.  And to resend requests while
851 	 * preserving this order we will want to put any sent
852 	 * requests back on the front of the osd client's unsent
853 	 * list.
854 	 *
855 	 * So we build a separate ordered list of already-sent
856 	 * requests for the affected osd and splice it onto the
857 	 * front of the osd client's unsent list.  Once we've seen a
858 	 * request that has not yet been sent we're done.  Those
859 	 * requests are already sitting right where they belong.
860 	 */
861 	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
862 		if (!req->r_sent)
863 			break;
864 		list_move_tail(&req->r_req_lru_item, &resend);
865 		dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
866 		     osd->o_osd);
867 		if (!req->r_linger)
868 			req->r_flags |= CEPH_OSD_FLAG_RETRY;
869 	}
870 	list_splice(&resend, &osdc->req_unsent);
871 
872 	/*
873 	 * Linger requests are re-registered before sending, which
874 	 * sets up a new tid for each.  We add them to the unsent
875 	 * list at the end to keep things in tid order.
876 	 */
877 	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
878 				 r_linger_osd) {
879 		/*
880 		 * reregister request prior to unregistering linger so
881 		 * that r_osd is preserved.
882 		 */
883 		BUG_ON(!list_empty(&req->r_req_lru_item));
884 		__register_request(osdc, req);
885 		list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
886 		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
887 		__unregister_linger_request(osdc, req);
888 		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
889 		     osd->o_osd);
890 	}
891 }
892 
893 /*
894  * If the osd connection drops, we need to resubmit all requests.
895  */
896 static void osd_reset(struct ceph_connection *con)
897 {
898 	struct ceph_osd *osd = con->private;
899 	struct ceph_osd_client *osdc;
900 
901 	if (!osd)
902 		return;
903 	dout("osd_reset osd%d\n", osd->o_osd);
904 	osdc = osd->o_osdc;
905 	down_read(&osdc->map_sem);
906 	mutex_lock(&osdc->request_mutex);
907 	__kick_osd_requests(osdc, osd);
908 	__send_queued(osdc);
909 	mutex_unlock(&osdc->request_mutex);
910 	up_read(&osdc->map_sem);
911 }
912 
913 /*
914  * Track open sessions with osds.
915  */
916 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
917 {
918 	struct ceph_osd *osd;
919 
920 	osd = kzalloc(sizeof(*osd), GFP_NOFS);
921 	if (!osd)
922 		return NULL;
923 
924 	atomic_set(&osd->o_ref, 1);
925 	osd->o_osdc = osdc;
926 	osd->o_osd = onum;
927 	RB_CLEAR_NODE(&osd->o_node);
928 	INIT_LIST_HEAD(&osd->o_requests);
929 	INIT_LIST_HEAD(&osd->o_linger_requests);
930 	INIT_LIST_HEAD(&osd->o_osd_lru);
931 	osd->o_incarnation = 1;
932 
933 	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
934 
935 	INIT_LIST_HEAD(&osd->o_keepalive_item);
936 	return osd;
937 }
938 
939 static struct ceph_osd *get_osd(struct ceph_osd *osd)
940 {
941 	if (atomic_inc_not_zero(&osd->o_ref)) {
942 		dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
943 		     atomic_read(&osd->o_ref));
944 		return osd;
945 	} else {
946 		dout("get_osd %p FAIL\n", osd);
947 		return NULL;
948 	}
949 }
950 
951 static void put_osd(struct ceph_osd *osd)
952 {
953 	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
954 	     atomic_read(&osd->o_ref) - 1);
955 	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
956 		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
957 
958 		ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
959 		kfree(osd);
960 	}
961 }
962 
963 /*
964  * remove an osd from our map
965  */
966 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
967 {
968 	dout("__remove_osd %p\n", osd);
969 	BUG_ON(!list_empty(&osd->o_requests));
970 	rb_erase(&osd->o_node, &osdc->osds);
971 	list_del_init(&osd->o_osd_lru);
972 	ceph_con_close(&osd->o_con);
973 	put_osd(osd);
974 }
975 
976 static void remove_all_osds(struct ceph_osd_client *osdc)
977 {
978 	dout("%s %p\n", __func__, osdc);
979 	mutex_lock(&osdc->request_mutex);
980 	while (!RB_EMPTY_ROOT(&osdc->osds)) {
981 		struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
982 						struct ceph_osd, o_node);
983 		__remove_osd(osdc, osd);
984 	}
985 	mutex_unlock(&osdc->request_mutex);
986 }
987 
988 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
989 			      struct ceph_osd *osd)
990 {
991 	dout("__move_osd_to_lru %p\n", osd);
992 	BUG_ON(!list_empty(&osd->o_osd_lru));
993 	list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
994 	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
995 }
996 
997 static void __remove_osd_from_lru(struct ceph_osd *osd)
998 {
999 	dout("__remove_osd_from_lru %p\n", osd);
1000 	if (!list_empty(&osd->o_osd_lru))
1001 		list_del_init(&osd->o_osd_lru);
1002 }
1003 
1004 static void remove_old_osds(struct ceph_osd_client *osdc)
1005 {
1006 	struct ceph_osd *osd, *nosd;
1007 
1008 	dout("__remove_old_osds %p\n", osdc);
1009 	mutex_lock(&osdc->request_mutex);
1010 	list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1011 		if (time_before(jiffies, osd->lru_ttl))
1012 			break;
1013 		__remove_osd(osdc, osd);
1014 	}
1015 	mutex_unlock(&osdc->request_mutex);
1016 }
1017 
1018 /*
1019  * reset osd connect
1020  */
1021 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1022 {
1023 	struct ceph_entity_addr *peer_addr;
1024 
1025 	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1026 	if (list_empty(&osd->o_requests) &&
1027 	    list_empty(&osd->o_linger_requests)) {
1028 		__remove_osd(osdc, osd);
1029 
1030 		return -ENODEV;
1031 	}
1032 
1033 	peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1034 	if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1035 			!ceph_con_opened(&osd->o_con)) {
1036 		struct ceph_osd_request *req;
1037 
1038 		dout(" osd addr hasn't changed and connection never opened,"
1039 		     " letting msgr retry");
1040 		/* touch each r_stamp for handle_timeout()'s benfit */
1041 		list_for_each_entry(req, &osd->o_requests, r_osd_item)
1042 			req->r_stamp = jiffies;
1043 
1044 		return -EAGAIN;
1045 	}
1046 
1047 	ceph_con_close(&osd->o_con);
1048 	ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1049 	osd->o_incarnation++;
1050 
1051 	return 0;
1052 }
1053 
1054 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1055 {
1056 	struct rb_node **p = &osdc->osds.rb_node;
1057 	struct rb_node *parent = NULL;
1058 	struct ceph_osd *osd = NULL;
1059 
1060 	dout("__insert_osd %p osd%d\n", new, new->o_osd);
1061 	while (*p) {
1062 		parent = *p;
1063 		osd = rb_entry(parent, struct ceph_osd, o_node);
1064 		if (new->o_osd < osd->o_osd)
1065 			p = &(*p)->rb_left;
1066 		else if (new->o_osd > osd->o_osd)
1067 			p = &(*p)->rb_right;
1068 		else
1069 			BUG();
1070 	}
1071 
1072 	rb_link_node(&new->o_node, parent, p);
1073 	rb_insert_color(&new->o_node, &osdc->osds);
1074 }
1075 
1076 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1077 {
1078 	struct ceph_osd *osd;
1079 	struct rb_node *n = osdc->osds.rb_node;
1080 
1081 	while (n) {
1082 		osd = rb_entry(n, struct ceph_osd, o_node);
1083 		if (o < osd->o_osd)
1084 			n = n->rb_left;
1085 		else if (o > osd->o_osd)
1086 			n = n->rb_right;
1087 		else
1088 			return osd;
1089 	}
1090 	return NULL;
1091 }
1092 
1093 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1094 {
1095 	schedule_delayed_work(&osdc->timeout_work,
1096 			osdc->client->options->osd_keepalive_timeout * HZ);
1097 }
1098 
1099 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1100 {
1101 	cancel_delayed_work(&osdc->timeout_work);
1102 }
1103 
1104 /*
1105  * Register request, assign tid.  If this is the first request, set up
1106  * the timeout event.
1107  */
1108 static void __register_request(struct ceph_osd_client *osdc,
1109 			       struct ceph_osd_request *req)
1110 {
1111 	req->r_tid = ++osdc->last_tid;
1112 	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1113 	dout("__register_request %p tid %lld\n", req, req->r_tid);
1114 	__insert_request(osdc, req);
1115 	ceph_osdc_get_request(req);
1116 	osdc->num_requests++;
1117 	if (osdc->num_requests == 1) {
1118 		dout(" first request, scheduling timeout\n");
1119 		__schedule_osd_timeout(osdc);
1120 	}
1121 }
1122 
1123 /*
1124  * called under osdc->request_mutex
1125  */
1126 static void __unregister_request(struct ceph_osd_client *osdc,
1127 				 struct ceph_osd_request *req)
1128 {
1129 	if (RB_EMPTY_NODE(&req->r_node)) {
1130 		dout("__unregister_request %p tid %lld not registered\n",
1131 			req, req->r_tid);
1132 		return;
1133 	}
1134 
1135 	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1136 	rb_erase(&req->r_node, &osdc->requests);
1137 	osdc->num_requests--;
1138 
1139 	if (req->r_osd) {
1140 		/* make sure the original request isn't in flight. */
1141 		ceph_msg_revoke(req->r_request);
1142 
1143 		list_del_init(&req->r_osd_item);
1144 		if (list_empty(&req->r_osd->o_requests) &&
1145 		    list_empty(&req->r_osd->o_linger_requests)) {
1146 			dout("moving osd to %p lru\n", req->r_osd);
1147 			__move_osd_to_lru(osdc, req->r_osd);
1148 		}
1149 		if (list_empty(&req->r_linger_item))
1150 			req->r_osd = NULL;
1151 	}
1152 
1153 	list_del_init(&req->r_req_lru_item);
1154 	ceph_osdc_put_request(req);
1155 
1156 	if (osdc->num_requests == 0) {
1157 		dout(" no requests, canceling timeout\n");
1158 		__cancel_osd_timeout(osdc);
1159 	}
1160 }
1161 
1162 /*
1163  * Cancel a previously queued request message
1164  */
1165 static void __cancel_request(struct ceph_osd_request *req)
1166 {
1167 	if (req->r_sent && req->r_osd) {
1168 		ceph_msg_revoke(req->r_request);
1169 		req->r_sent = 0;
1170 	}
1171 }
1172 
1173 static void __register_linger_request(struct ceph_osd_client *osdc,
1174 				    struct ceph_osd_request *req)
1175 {
1176 	dout("__register_linger_request %p\n", req);
1177 	list_add_tail(&req->r_linger_item, &osdc->req_linger);
1178 	if (req->r_osd)
1179 		list_add_tail(&req->r_linger_osd,
1180 			      &req->r_osd->o_linger_requests);
1181 }
1182 
1183 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1184 					struct ceph_osd_request *req)
1185 {
1186 	dout("__unregister_linger_request %p\n", req);
1187 	list_del_init(&req->r_linger_item);
1188 	if (req->r_osd) {
1189 		list_del_init(&req->r_linger_osd);
1190 
1191 		if (list_empty(&req->r_osd->o_requests) &&
1192 		    list_empty(&req->r_osd->o_linger_requests)) {
1193 			dout("moving osd to %p lru\n", req->r_osd);
1194 			__move_osd_to_lru(osdc, req->r_osd);
1195 		}
1196 		if (list_empty(&req->r_osd_item))
1197 			req->r_osd = NULL;
1198 	}
1199 }
1200 
1201 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1202 					 struct ceph_osd_request *req)
1203 {
1204 	mutex_lock(&osdc->request_mutex);
1205 	if (req->r_linger) {
1206 		__unregister_linger_request(osdc, req);
1207 		ceph_osdc_put_request(req);
1208 	}
1209 	mutex_unlock(&osdc->request_mutex);
1210 }
1211 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1212 
1213 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1214 				  struct ceph_osd_request *req)
1215 {
1216 	if (!req->r_linger) {
1217 		dout("set_request_linger %p\n", req);
1218 		req->r_linger = 1;
1219 		/*
1220 		 * caller is now responsible for calling
1221 		 * unregister_linger_request
1222 		 */
1223 		ceph_osdc_get_request(req);
1224 	}
1225 }
1226 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1227 
1228 /*
1229  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1230  * (as needed), and set the request r_osd appropriately.  If there is
1231  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1232  * (unsent, homeless) or leave on in-flight lru.
1233  *
1234  * Return 0 if unchanged, 1 if changed, or negative on error.
1235  *
1236  * Caller should hold map_sem for read and request_mutex.
1237  */
1238 static int __map_request(struct ceph_osd_client *osdc,
1239 			 struct ceph_osd_request *req, int force_resend)
1240 {
1241 	struct ceph_pg pgid;
1242 	int acting[CEPH_PG_MAX_SIZE];
1243 	int o = -1, num = 0;
1244 	int err;
1245 
1246 	dout("map_request %p tid %lld\n", req, req->r_tid);
1247 	err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
1248 				ceph_file_layout_pg_pool(req->r_file_layout));
1249 	if (err) {
1250 		list_move(&req->r_req_lru_item, &osdc->req_notarget);
1251 		return err;
1252 	}
1253 	req->r_pgid = pgid;
1254 
1255 	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1256 	if (err > 0) {
1257 		o = acting[0];
1258 		num = err;
1259 	}
1260 
1261 	if ((!force_resend &&
1262 	     req->r_osd && req->r_osd->o_osd == o &&
1263 	     req->r_sent >= req->r_osd->o_incarnation &&
1264 	     req->r_num_pg_osds == num &&
1265 	     memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1266 	    (req->r_osd == NULL && o == -1))
1267 		return 0;  /* no change */
1268 
1269 	dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1270 	     req->r_tid, pgid.pool, pgid.seed, o,
1271 	     req->r_osd ? req->r_osd->o_osd : -1);
1272 
1273 	/* record full pg acting set */
1274 	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1275 	req->r_num_pg_osds = num;
1276 
1277 	if (req->r_osd) {
1278 		__cancel_request(req);
1279 		list_del_init(&req->r_osd_item);
1280 		req->r_osd = NULL;
1281 	}
1282 
1283 	req->r_osd = __lookup_osd(osdc, o);
1284 	if (!req->r_osd && o >= 0) {
1285 		err = -ENOMEM;
1286 		req->r_osd = create_osd(osdc, o);
1287 		if (!req->r_osd) {
1288 			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1289 			goto out;
1290 		}
1291 
1292 		dout("map_request osd %p is osd%d\n", req->r_osd, o);
1293 		__insert_osd(osdc, req->r_osd);
1294 
1295 		ceph_con_open(&req->r_osd->o_con,
1296 			      CEPH_ENTITY_TYPE_OSD, o,
1297 			      &osdc->osdmap->osd_addr[o]);
1298 	}
1299 
1300 	if (req->r_osd) {
1301 		__remove_osd_from_lru(req->r_osd);
1302 		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1303 		list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1304 	} else {
1305 		list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1306 	}
1307 	err = 1;   /* osd or pg changed */
1308 
1309 out:
1310 	return err;
1311 }
1312 
1313 /*
1314  * caller should hold map_sem (for read) and request_mutex
1315  */
1316 static void __send_request(struct ceph_osd_client *osdc,
1317 			   struct ceph_osd_request *req)
1318 {
1319 	void *p;
1320 
1321 	dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1322 	     req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1323 	     (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1324 
1325 	/* fill in message content that changes each time we send it */
1326 	put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1327 	put_unaligned_le32(req->r_flags, req->r_request_flags);
1328 	put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
1329 	p = req->r_request_pgid;
1330 	ceph_encode_64(&p, req->r_pgid.pool);
1331 	ceph_encode_32(&p, req->r_pgid.seed);
1332 	put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1333 	memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1334 	       sizeof(req->r_reassert_version));
1335 
1336 	req->r_stamp = jiffies;
1337 	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1338 
1339 	ceph_msg_get(req->r_request); /* send consumes a ref */
1340 
1341 	/* Mark the request unsafe if this is the first timet's being sent. */
1342 
1343 	if (!req->r_sent && req->r_unsafe_callback)
1344 		req->r_unsafe_callback(req, true);
1345 	req->r_sent = req->r_osd->o_incarnation;
1346 
1347 	ceph_con_send(&req->r_osd->o_con, req->r_request);
1348 }
1349 
1350 /*
1351  * Send any requests in the queue (req_unsent).
1352  */
1353 static void __send_queued(struct ceph_osd_client *osdc)
1354 {
1355 	struct ceph_osd_request *req, *tmp;
1356 
1357 	dout("__send_queued\n");
1358 	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1359 		__send_request(osdc, req);
1360 }
1361 
1362 /*
1363  * Timeout callback, called every N seconds when 1 or more osd
1364  * requests has been active for more than N seconds.  When this
1365  * happens, we ping all OSDs with requests who have timed out to
1366  * ensure any communications channel reset is detected.  Reset the
1367  * request timeouts another N seconds in the future as we go.
1368  * Reschedule the timeout event another N seconds in future (unless
1369  * there are no open requests).
1370  */
1371 static void handle_timeout(struct work_struct *work)
1372 {
1373 	struct ceph_osd_client *osdc =
1374 		container_of(work, struct ceph_osd_client, timeout_work.work);
1375 	struct ceph_osd_request *req;
1376 	struct ceph_osd *osd;
1377 	unsigned long keepalive =
1378 		osdc->client->options->osd_keepalive_timeout * HZ;
1379 	struct list_head slow_osds;
1380 	dout("timeout\n");
1381 	down_read(&osdc->map_sem);
1382 
1383 	ceph_monc_request_next_osdmap(&osdc->client->monc);
1384 
1385 	mutex_lock(&osdc->request_mutex);
1386 
1387 	/*
1388 	 * ping osds that are a bit slow.  this ensures that if there
1389 	 * is a break in the TCP connection we will notice, and reopen
1390 	 * a connection with that osd (from the fault callback).
1391 	 */
1392 	INIT_LIST_HEAD(&slow_osds);
1393 	list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1394 		if (time_before(jiffies, req->r_stamp + keepalive))
1395 			break;
1396 
1397 		osd = req->r_osd;
1398 		BUG_ON(!osd);
1399 		dout(" tid %llu is slow, will send keepalive on osd%d\n",
1400 		     req->r_tid, osd->o_osd);
1401 		list_move_tail(&osd->o_keepalive_item, &slow_osds);
1402 	}
1403 	while (!list_empty(&slow_osds)) {
1404 		osd = list_entry(slow_osds.next, struct ceph_osd,
1405 				 o_keepalive_item);
1406 		list_del_init(&osd->o_keepalive_item);
1407 		ceph_con_keepalive(&osd->o_con);
1408 	}
1409 
1410 	__schedule_osd_timeout(osdc);
1411 	__send_queued(osdc);
1412 	mutex_unlock(&osdc->request_mutex);
1413 	up_read(&osdc->map_sem);
1414 }
1415 
1416 static void handle_osds_timeout(struct work_struct *work)
1417 {
1418 	struct ceph_osd_client *osdc =
1419 		container_of(work, struct ceph_osd_client,
1420 			     osds_timeout_work.work);
1421 	unsigned long delay =
1422 		osdc->client->options->osd_idle_ttl * HZ >> 2;
1423 
1424 	dout("osds timeout\n");
1425 	down_read(&osdc->map_sem);
1426 	remove_old_osds(osdc);
1427 	up_read(&osdc->map_sem);
1428 
1429 	schedule_delayed_work(&osdc->osds_timeout_work,
1430 			      round_jiffies_relative(delay));
1431 }
1432 
1433 static void complete_request(struct ceph_osd_request *req)
1434 {
1435 	if (req->r_unsafe_callback)
1436 		req->r_unsafe_callback(req, false);
1437 	complete_all(&req->r_safe_completion);  /* fsync waiter */
1438 }
1439 
1440 /*
1441  * handle osd op reply.  either call the callback if it is specified,
1442  * or do the completion to wake up the waiting thread.
1443  */
1444 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1445 			 struct ceph_connection *con)
1446 {
1447 	void *p, *end;
1448 	struct ceph_osd_request *req;
1449 	u64 tid;
1450 	int object_len;
1451 	unsigned int numops;
1452 	int payload_len, flags;
1453 	s32 result;
1454 	s32 retry_attempt;
1455 	struct ceph_pg pg;
1456 	int err;
1457 	u32 reassert_epoch;
1458 	u64 reassert_version;
1459 	u32 osdmap_epoch;
1460 	int already_completed;
1461 	u32 bytes;
1462 	unsigned int i;
1463 
1464 	tid = le64_to_cpu(msg->hdr.tid);
1465 	dout("handle_reply %p tid %llu\n", msg, tid);
1466 
1467 	p = msg->front.iov_base;
1468 	end = p + msg->front.iov_len;
1469 
1470 	ceph_decode_need(&p, end, 4, bad);
1471 	object_len = ceph_decode_32(&p);
1472 	ceph_decode_need(&p, end, object_len, bad);
1473 	p += object_len;
1474 
1475 	err = ceph_decode_pgid(&p, end, &pg);
1476 	if (err)
1477 		goto bad;
1478 
1479 	ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1480 	flags = ceph_decode_64(&p);
1481 	result = ceph_decode_32(&p);
1482 	reassert_epoch = ceph_decode_32(&p);
1483 	reassert_version = ceph_decode_64(&p);
1484 	osdmap_epoch = ceph_decode_32(&p);
1485 
1486 	/* lookup */
1487 	mutex_lock(&osdc->request_mutex);
1488 	req = __lookup_request(osdc, tid);
1489 	if (req == NULL) {
1490 		dout("handle_reply tid %llu dne\n", tid);
1491 		goto bad_mutex;
1492 	}
1493 	ceph_osdc_get_request(req);
1494 
1495 	dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1496 	     req, result);
1497 
1498 	ceph_decode_need(&p, end, 4, bad);
1499 	numops = ceph_decode_32(&p);
1500 	if (numops > CEPH_OSD_MAX_OP)
1501 		goto bad_put;
1502 	if (numops != req->r_num_ops)
1503 		goto bad_put;
1504 	payload_len = 0;
1505 	ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
1506 	for (i = 0; i < numops; i++) {
1507 		struct ceph_osd_op *op = p;
1508 		int len;
1509 
1510 		len = le32_to_cpu(op->payload_len);
1511 		req->r_reply_op_len[i] = len;
1512 		dout(" op %d has %d bytes\n", i, len);
1513 		payload_len += len;
1514 		p += sizeof(*op);
1515 	}
1516 	bytes = le32_to_cpu(msg->hdr.data_len);
1517 	if (payload_len != bytes) {
1518 		pr_warning("sum of op payload lens %d != data_len %d",
1519 			   payload_len, bytes);
1520 		goto bad_put;
1521 	}
1522 
1523 	ceph_decode_need(&p, end, 4 + numops * 4, bad);
1524 	retry_attempt = ceph_decode_32(&p);
1525 	for (i = 0; i < numops; i++)
1526 		req->r_reply_op_result[i] = ceph_decode_32(&p);
1527 
1528 	if (!req->r_got_reply) {
1529 
1530 		req->r_result = result;
1531 		dout("handle_reply result %d bytes %d\n", req->r_result,
1532 		     bytes);
1533 		if (req->r_result == 0)
1534 			req->r_result = bytes;
1535 
1536 		/* in case this is a write and we need to replay, */
1537 		req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1538 		req->r_reassert_version.version = cpu_to_le64(reassert_version);
1539 
1540 		req->r_got_reply = 1;
1541 	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1542 		dout("handle_reply tid %llu dup ack\n", tid);
1543 		mutex_unlock(&osdc->request_mutex);
1544 		goto done;
1545 	}
1546 
1547 	dout("handle_reply tid %llu flags %d\n", tid, flags);
1548 
1549 	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1550 		__register_linger_request(osdc, req);
1551 
1552 	/* either this is a read, or we got the safe response */
1553 	if (result < 0 ||
1554 	    (flags & CEPH_OSD_FLAG_ONDISK) ||
1555 	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1556 		__unregister_request(osdc, req);
1557 
1558 	already_completed = req->r_completed;
1559 	req->r_completed = 1;
1560 	mutex_unlock(&osdc->request_mutex);
1561 	if (already_completed)
1562 		goto done;
1563 
1564 	if (req->r_callback)
1565 		req->r_callback(req, msg);
1566 	else
1567 		complete_all(&req->r_completion);
1568 
1569 	if (flags & CEPH_OSD_FLAG_ONDISK)
1570 		complete_request(req);
1571 
1572 done:
1573 	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1574 	ceph_osdc_put_request(req);
1575 	return;
1576 
1577 bad_put:
1578 	ceph_osdc_put_request(req);
1579 bad_mutex:
1580 	mutex_unlock(&osdc->request_mutex);
1581 bad:
1582 	pr_err("corrupt osd_op_reply got %d %d\n",
1583 	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1584 	ceph_msg_dump(msg);
1585 }
1586 
1587 static void reset_changed_osds(struct ceph_osd_client *osdc)
1588 {
1589 	struct rb_node *p, *n;
1590 
1591 	for (p = rb_first(&osdc->osds); p; p = n) {
1592 		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1593 
1594 		n = rb_next(p);
1595 		if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1596 		    memcmp(&osd->o_con.peer_addr,
1597 			   ceph_osd_addr(osdc->osdmap,
1598 					 osd->o_osd),
1599 			   sizeof(struct ceph_entity_addr)) != 0)
1600 			__reset_osd(osdc, osd);
1601 	}
1602 }
1603 
1604 /*
1605  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1606  * no osd, request a new map.
1607  *
1608  * Caller should hold map_sem for read.
1609  */
1610 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1611 {
1612 	struct ceph_osd_request *req, *nreq;
1613 	struct rb_node *p;
1614 	int needmap = 0;
1615 	int err;
1616 
1617 	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1618 	mutex_lock(&osdc->request_mutex);
1619 	for (p = rb_first(&osdc->requests); p; ) {
1620 		req = rb_entry(p, struct ceph_osd_request, r_node);
1621 		p = rb_next(p);
1622 
1623 		/*
1624 		 * For linger requests that have not yet been
1625 		 * registered, move them to the linger list; they'll
1626 		 * be sent to the osd in the loop below.  Unregister
1627 		 * the request before re-registering it as a linger
1628 		 * request to ensure the __map_request() below
1629 		 * will decide it needs to be sent.
1630 		 */
1631 		if (req->r_linger && list_empty(&req->r_linger_item)) {
1632 			dout("%p tid %llu restart on osd%d\n",
1633 			     req, req->r_tid,
1634 			     req->r_osd ? req->r_osd->o_osd : -1);
1635 			__unregister_request(osdc, req);
1636 			__register_linger_request(osdc, req);
1637 			continue;
1638 		}
1639 
1640 		err = __map_request(osdc, req, force_resend);
1641 		if (err < 0)
1642 			continue;  /* error */
1643 		if (req->r_osd == NULL) {
1644 			dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1645 			needmap++;  /* request a newer map */
1646 		} else if (err > 0) {
1647 			if (!req->r_linger) {
1648 				dout("%p tid %llu requeued on osd%d\n", req,
1649 				     req->r_tid,
1650 				     req->r_osd ? req->r_osd->o_osd : -1);
1651 				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1652 			}
1653 		}
1654 	}
1655 
1656 	list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1657 				 r_linger_item) {
1658 		dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1659 
1660 		err = __map_request(osdc, req, force_resend);
1661 		dout("__map_request returned %d\n", err);
1662 		if (err == 0)
1663 			continue;  /* no change and no osd was specified */
1664 		if (err < 0)
1665 			continue;  /* hrm! */
1666 		if (req->r_osd == NULL) {
1667 			dout("tid %llu maps to no valid osd\n", req->r_tid);
1668 			needmap++;  /* request a newer map */
1669 			continue;
1670 		}
1671 
1672 		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1673 		     req->r_osd ? req->r_osd->o_osd : -1);
1674 		__register_request(osdc, req);
1675 		__unregister_linger_request(osdc, req);
1676 	}
1677 	mutex_unlock(&osdc->request_mutex);
1678 
1679 	if (needmap) {
1680 		dout("%d requests for down osds, need new map\n", needmap);
1681 		ceph_monc_request_next_osdmap(&osdc->client->monc);
1682 	}
1683 	reset_changed_osds(osdc);
1684 }
1685 
1686 
1687 /*
1688  * Process updated osd map.
1689  *
1690  * The message contains any number of incremental and full maps, normally
1691  * indicating some sort of topology change in the cluster.  Kick requests
1692  * off to different OSDs as needed.
1693  */
1694 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1695 {
1696 	void *p, *end, *next;
1697 	u32 nr_maps, maplen;
1698 	u32 epoch;
1699 	struct ceph_osdmap *newmap = NULL, *oldmap;
1700 	int err;
1701 	struct ceph_fsid fsid;
1702 
1703 	dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1704 	p = msg->front.iov_base;
1705 	end = p + msg->front.iov_len;
1706 
1707 	/* verify fsid */
1708 	ceph_decode_need(&p, end, sizeof(fsid), bad);
1709 	ceph_decode_copy(&p, &fsid, sizeof(fsid));
1710 	if (ceph_check_fsid(osdc->client, &fsid) < 0)
1711 		return;
1712 
1713 	down_write(&osdc->map_sem);
1714 
1715 	/* incremental maps */
1716 	ceph_decode_32_safe(&p, end, nr_maps, bad);
1717 	dout(" %d inc maps\n", nr_maps);
1718 	while (nr_maps > 0) {
1719 		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1720 		epoch = ceph_decode_32(&p);
1721 		maplen = ceph_decode_32(&p);
1722 		ceph_decode_need(&p, end, maplen, bad);
1723 		next = p + maplen;
1724 		if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1725 			dout("applying incremental map %u len %d\n",
1726 			     epoch, maplen);
1727 			newmap = osdmap_apply_incremental(&p, next,
1728 							  osdc->osdmap,
1729 							  &osdc->client->msgr);
1730 			if (IS_ERR(newmap)) {
1731 				err = PTR_ERR(newmap);
1732 				goto bad;
1733 			}
1734 			BUG_ON(!newmap);
1735 			if (newmap != osdc->osdmap) {
1736 				ceph_osdmap_destroy(osdc->osdmap);
1737 				osdc->osdmap = newmap;
1738 			}
1739 			kick_requests(osdc, 0);
1740 		} else {
1741 			dout("ignoring incremental map %u len %d\n",
1742 			     epoch, maplen);
1743 		}
1744 		p = next;
1745 		nr_maps--;
1746 	}
1747 	if (newmap)
1748 		goto done;
1749 
1750 	/* full maps */
1751 	ceph_decode_32_safe(&p, end, nr_maps, bad);
1752 	dout(" %d full maps\n", nr_maps);
1753 	while (nr_maps) {
1754 		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1755 		epoch = ceph_decode_32(&p);
1756 		maplen = ceph_decode_32(&p);
1757 		ceph_decode_need(&p, end, maplen, bad);
1758 		if (nr_maps > 1) {
1759 			dout("skipping non-latest full map %u len %d\n",
1760 			     epoch, maplen);
1761 		} else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1762 			dout("skipping full map %u len %d, "
1763 			     "older than our %u\n", epoch, maplen,
1764 			     osdc->osdmap->epoch);
1765 		} else {
1766 			int skipped_map = 0;
1767 
1768 			dout("taking full map %u len %d\n", epoch, maplen);
1769 			newmap = osdmap_decode(&p, p+maplen);
1770 			if (IS_ERR(newmap)) {
1771 				err = PTR_ERR(newmap);
1772 				goto bad;
1773 			}
1774 			BUG_ON(!newmap);
1775 			oldmap = osdc->osdmap;
1776 			osdc->osdmap = newmap;
1777 			if (oldmap) {
1778 				if (oldmap->epoch + 1 < newmap->epoch)
1779 					skipped_map = 1;
1780 				ceph_osdmap_destroy(oldmap);
1781 			}
1782 			kick_requests(osdc, skipped_map);
1783 		}
1784 		p += maplen;
1785 		nr_maps--;
1786 	}
1787 
1788 done:
1789 	downgrade_write(&osdc->map_sem);
1790 	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1791 
1792 	/*
1793 	 * subscribe to subsequent osdmap updates if full to ensure
1794 	 * we find out when we are no longer full and stop returning
1795 	 * ENOSPC.
1796 	 */
1797 	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1798 		ceph_monc_request_next_osdmap(&osdc->client->monc);
1799 
1800 	mutex_lock(&osdc->request_mutex);
1801 	__send_queued(osdc);
1802 	mutex_unlock(&osdc->request_mutex);
1803 	up_read(&osdc->map_sem);
1804 	wake_up_all(&osdc->client->auth_wq);
1805 	return;
1806 
1807 bad:
1808 	pr_err("osdc handle_map corrupt msg\n");
1809 	ceph_msg_dump(msg);
1810 	up_write(&osdc->map_sem);
1811 	return;
1812 }
1813 
1814 /*
1815  * watch/notify callback event infrastructure
1816  *
1817  * These callbacks are used both for watch and notify operations.
1818  */
1819 static void __release_event(struct kref *kref)
1820 {
1821 	struct ceph_osd_event *event =
1822 		container_of(kref, struct ceph_osd_event, kref);
1823 
1824 	dout("__release_event %p\n", event);
1825 	kfree(event);
1826 }
1827 
1828 static void get_event(struct ceph_osd_event *event)
1829 {
1830 	kref_get(&event->kref);
1831 }
1832 
1833 void ceph_osdc_put_event(struct ceph_osd_event *event)
1834 {
1835 	kref_put(&event->kref, __release_event);
1836 }
1837 EXPORT_SYMBOL(ceph_osdc_put_event);
1838 
1839 static void __insert_event(struct ceph_osd_client *osdc,
1840 			     struct ceph_osd_event *new)
1841 {
1842 	struct rb_node **p = &osdc->event_tree.rb_node;
1843 	struct rb_node *parent = NULL;
1844 	struct ceph_osd_event *event = NULL;
1845 
1846 	while (*p) {
1847 		parent = *p;
1848 		event = rb_entry(parent, struct ceph_osd_event, node);
1849 		if (new->cookie < event->cookie)
1850 			p = &(*p)->rb_left;
1851 		else if (new->cookie > event->cookie)
1852 			p = &(*p)->rb_right;
1853 		else
1854 			BUG();
1855 	}
1856 
1857 	rb_link_node(&new->node, parent, p);
1858 	rb_insert_color(&new->node, &osdc->event_tree);
1859 }
1860 
1861 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1862 					        u64 cookie)
1863 {
1864 	struct rb_node **p = &osdc->event_tree.rb_node;
1865 	struct rb_node *parent = NULL;
1866 	struct ceph_osd_event *event = NULL;
1867 
1868 	while (*p) {
1869 		parent = *p;
1870 		event = rb_entry(parent, struct ceph_osd_event, node);
1871 		if (cookie < event->cookie)
1872 			p = &(*p)->rb_left;
1873 		else if (cookie > event->cookie)
1874 			p = &(*p)->rb_right;
1875 		else
1876 			return event;
1877 	}
1878 	return NULL;
1879 }
1880 
1881 static void __remove_event(struct ceph_osd_event *event)
1882 {
1883 	struct ceph_osd_client *osdc = event->osdc;
1884 
1885 	if (!RB_EMPTY_NODE(&event->node)) {
1886 		dout("__remove_event removed %p\n", event);
1887 		rb_erase(&event->node, &osdc->event_tree);
1888 		ceph_osdc_put_event(event);
1889 	} else {
1890 		dout("__remove_event didn't remove %p\n", event);
1891 	}
1892 }
1893 
1894 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1895 			   void (*event_cb)(u64, u64, u8, void *),
1896 			   void *data, struct ceph_osd_event **pevent)
1897 {
1898 	struct ceph_osd_event *event;
1899 
1900 	event = kmalloc(sizeof(*event), GFP_NOIO);
1901 	if (!event)
1902 		return -ENOMEM;
1903 
1904 	dout("create_event %p\n", event);
1905 	event->cb = event_cb;
1906 	event->one_shot = 0;
1907 	event->data = data;
1908 	event->osdc = osdc;
1909 	INIT_LIST_HEAD(&event->osd_node);
1910 	RB_CLEAR_NODE(&event->node);
1911 	kref_init(&event->kref);   /* one ref for us */
1912 	kref_get(&event->kref);    /* one ref for the caller */
1913 
1914 	spin_lock(&osdc->event_lock);
1915 	event->cookie = ++osdc->event_count;
1916 	__insert_event(osdc, event);
1917 	spin_unlock(&osdc->event_lock);
1918 
1919 	*pevent = event;
1920 	return 0;
1921 }
1922 EXPORT_SYMBOL(ceph_osdc_create_event);
1923 
1924 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1925 {
1926 	struct ceph_osd_client *osdc = event->osdc;
1927 
1928 	dout("cancel_event %p\n", event);
1929 	spin_lock(&osdc->event_lock);
1930 	__remove_event(event);
1931 	spin_unlock(&osdc->event_lock);
1932 	ceph_osdc_put_event(event); /* caller's */
1933 }
1934 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1935 
1936 
1937 static void do_event_work(struct work_struct *work)
1938 {
1939 	struct ceph_osd_event_work *event_work =
1940 		container_of(work, struct ceph_osd_event_work, work);
1941 	struct ceph_osd_event *event = event_work->event;
1942 	u64 ver = event_work->ver;
1943 	u64 notify_id = event_work->notify_id;
1944 	u8 opcode = event_work->opcode;
1945 
1946 	dout("do_event_work completing %p\n", event);
1947 	event->cb(ver, notify_id, opcode, event->data);
1948 	dout("do_event_work completed %p\n", event);
1949 	ceph_osdc_put_event(event);
1950 	kfree(event_work);
1951 }
1952 
1953 
1954 /*
1955  * Process osd watch notifications
1956  */
1957 static void handle_watch_notify(struct ceph_osd_client *osdc,
1958 				struct ceph_msg *msg)
1959 {
1960 	void *p, *end;
1961 	u8 proto_ver;
1962 	u64 cookie, ver, notify_id;
1963 	u8 opcode;
1964 	struct ceph_osd_event *event;
1965 	struct ceph_osd_event_work *event_work;
1966 
1967 	p = msg->front.iov_base;
1968 	end = p + msg->front.iov_len;
1969 
1970 	ceph_decode_8_safe(&p, end, proto_ver, bad);
1971 	ceph_decode_8_safe(&p, end, opcode, bad);
1972 	ceph_decode_64_safe(&p, end, cookie, bad);
1973 	ceph_decode_64_safe(&p, end, ver, bad);
1974 	ceph_decode_64_safe(&p, end, notify_id, bad);
1975 
1976 	spin_lock(&osdc->event_lock);
1977 	event = __find_event(osdc, cookie);
1978 	if (event) {
1979 		BUG_ON(event->one_shot);
1980 		get_event(event);
1981 	}
1982 	spin_unlock(&osdc->event_lock);
1983 	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1984 	     cookie, ver, event);
1985 	if (event) {
1986 		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1987 		if (!event_work) {
1988 			dout("ERROR: could not allocate event_work\n");
1989 			goto done_err;
1990 		}
1991 		INIT_WORK(&event_work->work, do_event_work);
1992 		event_work->event = event;
1993 		event_work->ver = ver;
1994 		event_work->notify_id = notify_id;
1995 		event_work->opcode = opcode;
1996 		if (!queue_work(osdc->notify_wq, &event_work->work)) {
1997 			dout("WARNING: failed to queue notify event work\n");
1998 			goto done_err;
1999 		}
2000 	}
2001 
2002 	return;
2003 
2004 done_err:
2005 	ceph_osdc_put_event(event);
2006 	return;
2007 
2008 bad:
2009 	pr_err("osdc handle_watch_notify corrupt msg\n");
2010 	return;
2011 }
2012 
2013 /*
2014  * build new request AND message
2015  *
2016  */
2017 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2018 				struct ceph_snap_context *snapc, u64 snap_id,
2019 				struct timespec *mtime)
2020 {
2021 	struct ceph_msg *msg = req->r_request;
2022 	void *p;
2023 	size_t msg_size;
2024 	int flags = req->r_flags;
2025 	u64 data_len;
2026 	unsigned int i;
2027 
2028 	req->r_snapid = snap_id;
2029 	req->r_snapc = ceph_get_snap_context(snapc);
2030 
2031 	/* encode request */
2032 	msg->hdr.version = cpu_to_le16(4);
2033 
2034 	p = msg->front.iov_base;
2035 	ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2036 	req->r_request_osdmap_epoch = p;
2037 	p += 4;
2038 	req->r_request_flags = p;
2039 	p += 4;
2040 	if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2041 		ceph_encode_timespec(p, mtime);
2042 	p += sizeof(struct ceph_timespec);
2043 	req->r_request_reassert_version = p;
2044 	p += sizeof(struct ceph_eversion); /* will get filled in */
2045 
2046 	/* oloc */
2047 	ceph_encode_8(&p, 4);
2048 	ceph_encode_8(&p, 4);
2049 	ceph_encode_32(&p, 8 + 4 + 4);
2050 	req->r_request_pool = p;
2051 	p += 8;
2052 	ceph_encode_32(&p, -1);  /* preferred */
2053 	ceph_encode_32(&p, 0);   /* key len */
2054 
2055 	ceph_encode_8(&p, 1);
2056 	req->r_request_pgid = p;
2057 	p += 8 + 4;
2058 	ceph_encode_32(&p, -1);  /* preferred */
2059 
2060 	/* oid */
2061 	ceph_encode_32(&p, req->r_oid_len);
2062 	memcpy(p, req->r_oid, req->r_oid_len);
2063 	dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
2064 	p += req->r_oid_len;
2065 
2066 	/* ops--can imply data */
2067 	ceph_encode_16(&p, (u16)req->r_num_ops);
2068 	data_len = 0;
2069 	for (i = 0; i < req->r_num_ops; i++) {
2070 		data_len += osd_req_encode_op(req, p, i);
2071 		p += sizeof(struct ceph_osd_op);
2072 	}
2073 
2074 	/* snaps */
2075 	ceph_encode_64(&p, req->r_snapid);
2076 	ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2077 	ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2078 	if (req->r_snapc) {
2079 		for (i = 0; i < snapc->num_snaps; i++) {
2080 			ceph_encode_64(&p, req->r_snapc->snaps[i]);
2081 		}
2082 	}
2083 
2084 	req->r_request_attempts = p;
2085 	p += 4;
2086 
2087 	/* data */
2088 	if (flags & CEPH_OSD_FLAG_WRITE) {
2089 		u16 data_off;
2090 
2091 		/*
2092 		 * The header "data_off" is a hint to the receiver
2093 		 * allowing it to align received data into its
2094 		 * buffers such that there's no need to re-copy
2095 		 * it before writing it to disk (direct I/O).
2096 		 */
2097 		data_off = (u16) (off & 0xffff);
2098 		req->r_request->hdr.data_off = cpu_to_le16(data_off);
2099 	}
2100 	req->r_request->hdr.data_len = cpu_to_le32(data_len);
2101 
2102 	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2103 	msg_size = p - msg->front.iov_base;
2104 	msg->front.iov_len = msg_size;
2105 	msg->hdr.front_len = cpu_to_le32(msg_size);
2106 
2107 	dout("build_request msg_size was %d\n", (int)msg_size);
2108 }
2109 EXPORT_SYMBOL(ceph_osdc_build_request);
2110 
2111 /*
2112  * Register request, send initial attempt.
2113  */
2114 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2115 			    struct ceph_osd_request *req,
2116 			    bool nofail)
2117 {
2118 	int rc = 0;
2119 
2120 	down_read(&osdc->map_sem);
2121 	mutex_lock(&osdc->request_mutex);
2122 	__register_request(osdc, req);
2123 	WARN_ON(req->r_sent);
2124 	rc = __map_request(osdc, req, 0);
2125 	if (rc < 0) {
2126 		if (nofail) {
2127 			dout("osdc_start_request failed map, "
2128 				" will retry %lld\n", req->r_tid);
2129 			rc = 0;
2130 		}
2131 		goto out_unlock;
2132 	}
2133 	if (req->r_osd == NULL) {
2134 		dout("send_request %p no up osds in pg\n", req);
2135 		ceph_monc_request_next_osdmap(&osdc->client->monc);
2136 	} else {
2137 		__send_queued(osdc);
2138 	}
2139 	rc = 0;
2140 out_unlock:
2141 	mutex_unlock(&osdc->request_mutex);
2142 	up_read(&osdc->map_sem);
2143 	return rc;
2144 }
2145 EXPORT_SYMBOL(ceph_osdc_start_request);
2146 
2147 /*
2148  * wait for a request to complete
2149  */
2150 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2151 			   struct ceph_osd_request *req)
2152 {
2153 	int rc;
2154 
2155 	rc = wait_for_completion_interruptible(&req->r_completion);
2156 	if (rc < 0) {
2157 		mutex_lock(&osdc->request_mutex);
2158 		__cancel_request(req);
2159 		__unregister_request(osdc, req);
2160 		mutex_unlock(&osdc->request_mutex);
2161 		complete_request(req);
2162 		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2163 		return rc;
2164 	}
2165 
2166 	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2167 	return req->r_result;
2168 }
2169 EXPORT_SYMBOL(ceph_osdc_wait_request);
2170 
2171 /*
2172  * sync - wait for all in-flight requests to flush.  avoid starvation.
2173  */
2174 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2175 {
2176 	struct ceph_osd_request *req;
2177 	u64 last_tid, next_tid = 0;
2178 
2179 	mutex_lock(&osdc->request_mutex);
2180 	last_tid = osdc->last_tid;
2181 	while (1) {
2182 		req = __lookup_request_ge(osdc, next_tid);
2183 		if (!req)
2184 			break;
2185 		if (req->r_tid > last_tid)
2186 			break;
2187 
2188 		next_tid = req->r_tid + 1;
2189 		if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2190 			continue;
2191 
2192 		ceph_osdc_get_request(req);
2193 		mutex_unlock(&osdc->request_mutex);
2194 		dout("sync waiting on tid %llu (last is %llu)\n",
2195 		     req->r_tid, last_tid);
2196 		wait_for_completion(&req->r_safe_completion);
2197 		mutex_lock(&osdc->request_mutex);
2198 		ceph_osdc_put_request(req);
2199 	}
2200 	mutex_unlock(&osdc->request_mutex);
2201 	dout("sync done (thru tid %llu)\n", last_tid);
2202 }
2203 EXPORT_SYMBOL(ceph_osdc_sync);
2204 
2205 /*
2206  * init, shutdown
2207  */
2208 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2209 {
2210 	int err;
2211 
2212 	dout("init\n");
2213 	osdc->client = client;
2214 	osdc->osdmap = NULL;
2215 	init_rwsem(&osdc->map_sem);
2216 	init_completion(&osdc->map_waiters);
2217 	osdc->last_requested_map = 0;
2218 	mutex_init(&osdc->request_mutex);
2219 	osdc->last_tid = 0;
2220 	osdc->osds = RB_ROOT;
2221 	INIT_LIST_HEAD(&osdc->osd_lru);
2222 	osdc->requests = RB_ROOT;
2223 	INIT_LIST_HEAD(&osdc->req_lru);
2224 	INIT_LIST_HEAD(&osdc->req_unsent);
2225 	INIT_LIST_HEAD(&osdc->req_notarget);
2226 	INIT_LIST_HEAD(&osdc->req_linger);
2227 	osdc->num_requests = 0;
2228 	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2229 	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2230 	spin_lock_init(&osdc->event_lock);
2231 	osdc->event_tree = RB_ROOT;
2232 	osdc->event_count = 0;
2233 
2234 	schedule_delayed_work(&osdc->osds_timeout_work,
2235 	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2236 
2237 	err = -ENOMEM;
2238 	osdc->req_mempool = mempool_create_kmalloc_pool(10,
2239 					sizeof(struct ceph_osd_request));
2240 	if (!osdc->req_mempool)
2241 		goto out;
2242 
2243 	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2244 				OSD_OP_FRONT_LEN, 10, true,
2245 				"osd_op");
2246 	if (err < 0)
2247 		goto out_mempool;
2248 	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2249 				OSD_OPREPLY_FRONT_LEN, 10, true,
2250 				"osd_op_reply");
2251 	if (err < 0)
2252 		goto out_msgpool;
2253 
2254 	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2255 	if (IS_ERR(osdc->notify_wq)) {
2256 		err = PTR_ERR(osdc->notify_wq);
2257 		osdc->notify_wq = NULL;
2258 		goto out_msgpool;
2259 	}
2260 	return 0;
2261 
2262 out_msgpool:
2263 	ceph_msgpool_destroy(&osdc->msgpool_op);
2264 out_mempool:
2265 	mempool_destroy(osdc->req_mempool);
2266 out:
2267 	return err;
2268 }
2269 
2270 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2271 {
2272 	flush_workqueue(osdc->notify_wq);
2273 	destroy_workqueue(osdc->notify_wq);
2274 	cancel_delayed_work_sync(&osdc->timeout_work);
2275 	cancel_delayed_work_sync(&osdc->osds_timeout_work);
2276 	if (osdc->osdmap) {
2277 		ceph_osdmap_destroy(osdc->osdmap);
2278 		osdc->osdmap = NULL;
2279 	}
2280 	remove_all_osds(osdc);
2281 	mempool_destroy(osdc->req_mempool);
2282 	ceph_msgpool_destroy(&osdc->msgpool_op);
2283 	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2284 }
2285 
2286 /*
2287  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2288  * *plen.  Return number of bytes read, or error.
2289  */
2290 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2291 			struct ceph_vino vino, struct ceph_file_layout *layout,
2292 			u64 off, u64 *plen,
2293 			u32 truncate_seq, u64 truncate_size,
2294 			struct page **pages, int num_pages, int page_align)
2295 {
2296 	struct ceph_osd_request *req;
2297 	int rc = 0;
2298 
2299 	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2300 	     vino.snap, off, *plen);
2301 	req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2302 				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2303 				    NULL, truncate_seq, truncate_size,
2304 				    false);
2305 	if (IS_ERR(req))
2306 		return PTR_ERR(req);
2307 
2308 	/* it may be a short read due to an object boundary */
2309 
2310 	osd_req_op_extent_osd_data_pages(req, 0,
2311 				pages, *plen, page_align, false, false);
2312 
2313 	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2314 	     off, *plen, *plen, page_align);
2315 
2316 	ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2317 
2318 	rc = ceph_osdc_start_request(osdc, req, false);
2319 	if (!rc)
2320 		rc = ceph_osdc_wait_request(osdc, req);
2321 
2322 	ceph_osdc_put_request(req);
2323 	dout("readpages result %d\n", rc);
2324 	return rc;
2325 }
2326 EXPORT_SYMBOL(ceph_osdc_readpages);
2327 
2328 /*
2329  * do a synchronous write on N pages
2330  */
2331 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2332 			 struct ceph_file_layout *layout,
2333 			 struct ceph_snap_context *snapc,
2334 			 u64 off, u64 len,
2335 			 u32 truncate_seq, u64 truncate_size,
2336 			 struct timespec *mtime,
2337 			 struct page **pages, int num_pages)
2338 {
2339 	struct ceph_osd_request *req;
2340 	int rc = 0;
2341 	int page_align = off & ~PAGE_MASK;
2342 
2343 	BUG_ON(vino.snap != CEPH_NOSNAP);	/* snapshots aren't writeable */
2344 	req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2345 				    CEPH_OSD_OP_WRITE,
2346 				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2347 				    snapc, truncate_seq, truncate_size,
2348 				    true);
2349 	if (IS_ERR(req))
2350 		return PTR_ERR(req);
2351 
2352 	/* it may be a short write due to an object boundary */
2353 	osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2354 				false, false);
2355 	dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2356 
2357 	ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2358 
2359 	rc = ceph_osdc_start_request(osdc, req, true);
2360 	if (!rc)
2361 		rc = ceph_osdc_wait_request(osdc, req);
2362 
2363 	ceph_osdc_put_request(req);
2364 	if (rc == 0)
2365 		rc = len;
2366 	dout("writepages result %d\n", rc);
2367 	return rc;
2368 }
2369 EXPORT_SYMBOL(ceph_osdc_writepages);
2370 
2371 int ceph_osdc_setup(void)
2372 {
2373 	BUG_ON(ceph_osd_request_cache);
2374 	ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2375 					sizeof (struct ceph_osd_request),
2376 					__alignof__(struct ceph_osd_request),
2377 					0, NULL);
2378 
2379 	return ceph_osd_request_cache ? 0 : -ENOMEM;
2380 }
2381 EXPORT_SYMBOL(ceph_osdc_setup);
2382 
2383 void ceph_osdc_cleanup(void)
2384 {
2385 	BUG_ON(!ceph_osd_request_cache);
2386 	kmem_cache_destroy(ceph_osd_request_cache);
2387 	ceph_osd_request_cache = NULL;
2388 }
2389 EXPORT_SYMBOL(ceph_osdc_cleanup);
2390 
2391 /*
2392  * handle incoming message
2393  */
2394 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2395 {
2396 	struct ceph_osd *osd = con->private;
2397 	struct ceph_osd_client *osdc;
2398 	int type = le16_to_cpu(msg->hdr.type);
2399 
2400 	if (!osd)
2401 		goto out;
2402 	osdc = osd->o_osdc;
2403 
2404 	switch (type) {
2405 	case CEPH_MSG_OSD_MAP:
2406 		ceph_osdc_handle_map(osdc, msg);
2407 		break;
2408 	case CEPH_MSG_OSD_OPREPLY:
2409 		handle_reply(osdc, msg, con);
2410 		break;
2411 	case CEPH_MSG_WATCH_NOTIFY:
2412 		handle_watch_notify(osdc, msg);
2413 		break;
2414 
2415 	default:
2416 		pr_err("received unknown message type %d %s\n", type,
2417 		       ceph_msg_type_name(type));
2418 	}
2419 out:
2420 	ceph_msg_put(msg);
2421 }
2422 
2423 /*
2424  * lookup and return message for incoming reply.  set up reply message
2425  * pages.
2426  */
2427 static struct ceph_msg *get_reply(struct ceph_connection *con,
2428 				  struct ceph_msg_header *hdr,
2429 				  int *skip)
2430 {
2431 	struct ceph_osd *osd = con->private;
2432 	struct ceph_osd_client *osdc = osd->o_osdc;
2433 	struct ceph_msg *m;
2434 	struct ceph_osd_request *req;
2435 	int front = le32_to_cpu(hdr->front_len);
2436 	int data_len = le32_to_cpu(hdr->data_len);
2437 	u64 tid;
2438 
2439 	tid = le64_to_cpu(hdr->tid);
2440 	mutex_lock(&osdc->request_mutex);
2441 	req = __lookup_request(osdc, tid);
2442 	if (!req) {
2443 		*skip = 1;
2444 		m = NULL;
2445 		dout("get_reply unknown tid %llu from osd%d\n", tid,
2446 		     osd->o_osd);
2447 		goto out;
2448 	}
2449 
2450 	if (req->r_reply->con)
2451 		dout("%s revoking msg %p from old con %p\n", __func__,
2452 		     req->r_reply, req->r_reply->con);
2453 	ceph_msg_revoke_incoming(req->r_reply);
2454 
2455 	if (front > req->r_reply->front.iov_len) {
2456 		pr_warning("get_reply front %d > preallocated %d\n",
2457 			   front, (int)req->r_reply->front.iov_len);
2458 		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2459 		if (!m)
2460 			goto out;
2461 		ceph_msg_put(req->r_reply);
2462 		req->r_reply = m;
2463 	}
2464 	m = ceph_msg_get(req->r_reply);
2465 
2466 	if (data_len > 0) {
2467 		struct ceph_osd_data *osd_data;
2468 
2469 		/*
2470 		 * XXX This is assuming there is only one op containing
2471 		 * XXX page data.  Probably OK for reads, but this
2472 		 * XXX ought to be done more generally.
2473 		 */
2474 		osd_data = osd_req_op_extent_osd_data(req, 0);
2475 		if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2476 			if (osd_data->pages &&
2477 				unlikely(osd_data->length < data_len)) {
2478 
2479 				pr_warning("tid %lld reply has %d bytes "
2480 					"we had only %llu bytes ready\n",
2481 					tid, data_len, osd_data->length);
2482 				*skip = 1;
2483 				ceph_msg_put(m);
2484 				m = NULL;
2485 				goto out;
2486 			}
2487 		}
2488 	}
2489 	*skip = 0;
2490 	dout("get_reply tid %lld %p\n", tid, m);
2491 
2492 out:
2493 	mutex_unlock(&osdc->request_mutex);
2494 	return m;
2495 
2496 }
2497 
2498 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2499 				  struct ceph_msg_header *hdr,
2500 				  int *skip)
2501 {
2502 	struct ceph_osd *osd = con->private;
2503 	int type = le16_to_cpu(hdr->type);
2504 	int front = le32_to_cpu(hdr->front_len);
2505 
2506 	*skip = 0;
2507 	switch (type) {
2508 	case CEPH_MSG_OSD_MAP:
2509 	case CEPH_MSG_WATCH_NOTIFY:
2510 		return ceph_msg_new(type, front, GFP_NOFS, false);
2511 	case CEPH_MSG_OSD_OPREPLY:
2512 		return get_reply(con, hdr, skip);
2513 	default:
2514 		pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2515 			osd->o_osd);
2516 		*skip = 1;
2517 		return NULL;
2518 	}
2519 }
2520 
2521 /*
2522  * Wrappers to refcount containing ceph_osd struct
2523  */
2524 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2525 {
2526 	struct ceph_osd *osd = con->private;
2527 	if (get_osd(osd))
2528 		return con;
2529 	return NULL;
2530 }
2531 
2532 static void put_osd_con(struct ceph_connection *con)
2533 {
2534 	struct ceph_osd *osd = con->private;
2535 	put_osd(osd);
2536 }
2537 
2538 /*
2539  * authentication
2540  */
2541 /*
2542  * Note: returned pointer is the address of a structure that's
2543  * managed separately.  Caller must *not* attempt to free it.
2544  */
2545 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2546 					int *proto, int force_new)
2547 {
2548 	struct ceph_osd *o = con->private;
2549 	struct ceph_osd_client *osdc = o->o_osdc;
2550 	struct ceph_auth_client *ac = osdc->client->monc.auth;
2551 	struct ceph_auth_handshake *auth = &o->o_auth;
2552 
2553 	if (force_new && auth->authorizer) {
2554 		ceph_auth_destroy_authorizer(ac, auth->authorizer);
2555 		auth->authorizer = NULL;
2556 	}
2557 	if (!auth->authorizer) {
2558 		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2559 						      auth);
2560 		if (ret)
2561 			return ERR_PTR(ret);
2562 	} else {
2563 		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2564 						     auth);
2565 		if (ret)
2566 			return ERR_PTR(ret);
2567 	}
2568 	*proto = ac->protocol;
2569 
2570 	return auth;
2571 }
2572 
2573 
2574 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2575 {
2576 	struct ceph_osd *o = con->private;
2577 	struct ceph_osd_client *osdc = o->o_osdc;
2578 	struct ceph_auth_client *ac = osdc->client->monc.auth;
2579 
2580 	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2581 }
2582 
2583 static int invalidate_authorizer(struct ceph_connection *con)
2584 {
2585 	struct ceph_osd *o = con->private;
2586 	struct ceph_osd_client *osdc = o->o_osdc;
2587 	struct ceph_auth_client *ac = osdc->client->monc.auth;
2588 
2589 	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2590 	return ceph_monc_validate_auth(&osdc->client->monc);
2591 }
2592 
2593 static const struct ceph_connection_operations osd_con_ops = {
2594 	.get = get_osd_con,
2595 	.put = put_osd_con,
2596 	.dispatch = dispatch,
2597 	.get_authorizer = get_authorizer,
2598 	.verify_authorizer_reply = verify_authorizer_reply,
2599 	.invalidate_authorizer = invalidate_authorizer,
2600 	.alloc_msg = alloc_msg,
2601 	.fault = osd_reset,
2602 };
2603