libceph: call r_unsafe_callback when unsafe reply is received
[linux-3.10.git] / net / ceph / osd_client.c
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/err.h>
6 #include <linux/highmem.h>
7 #include <linux/mm.h>
8 #include <linux/pagemap.h>
9 #include <linux/slab.h>
10 #include <linux/uaccess.h>
11 #ifdef CONFIG_BLOCK
12 #include <linux/bio.h>
13 #endif
14
15 #include <linux/ceph/libceph.h>
16 #include <linux/ceph/osd_client.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/auth.h>
20 #include <linux/ceph/pagelist.h>
21
22 #define OSD_OP_FRONT_LEN        4096
23 #define OSD_OPREPLY_FRONT_LEN   512
24
25 static struct kmem_cache        *ceph_osd_request_cache;
26
27 static const struct ceph_connection_operations osd_con_ops;
28
29 static void __send_queued(struct ceph_osd_client *osdc);
30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
31 static void __register_request(struct ceph_osd_client *osdc,
32                                struct ceph_osd_request *req);
33 static void __unregister_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_seq == 1 && truncate_size == -1ULL)) {
737                 if (truncate_size <= object_base) {
738                         truncate_size = 0;
739                 } else {
740                         truncate_size -= object_base;
741                         if (truncate_size > object_size)
742                                 truncate_size = object_size;
743                 }
744         }
745
746         osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
747                                 truncate_size, truncate_seq);
748
749         /*
750          * A second op in the ops array means the caller wants to
751          * also issue a include a 'startsync' command so that the
752          * osd will flush data quickly.
753          */
754         if (num_ops > 1)
755                 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
756
757         req->r_file_layout = *layout;  /* keep a copy */
758
759         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
760                 vino.ino, objnum);
761         req->r_oid_len = strlen(req->r_oid);
762
763         return req;
764 }
765 EXPORT_SYMBOL(ceph_osdc_new_request);
766
767 /*
768  * We keep osd requests in an rbtree, sorted by ->r_tid.
769  */
770 static void __insert_request(struct ceph_osd_client *osdc,
771                              struct ceph_osd_request *new)
772 {
773         struct rb_node **p = &osdc->requests.rb_node;
774         struct rb_node *parent = NULL;
775         struct ceph_osd_request *req = NULL;
776
777         while (*p) {
778                 parent = *p;
779                 req = rb_entry(parent, struct ceph_osd_request, r_node);
780                 if (new->r_tid < req->r_tid)
781                         p = &(*p)->rb_left;
782                 else if (new->r_tid > req->r_tid)
783                         p = &(*p)->rb_right;
784                 else
785                         BUG();
786         }
787
788         rb_link_node(&new->r_node, parent, p);
789         rb_insert_color(&new->r_node, &osdc->requests);
790 }
791
792 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
793                                                  u64 tid)
794 {
795         struct ceph_osd_request *req;
796         struct rb_node *n = osdc->requests.rb_node;
797
798         while (n) {
799                 req = rb_entry(n, struct ceph_osd_request, r_node);
800                 if (tid < req->r_tid)
801                         n = n->rb_left;
802                 else if (tid > req->r_tid)
803                         n = n->rb_right;
804                 else
805                         return req;
806         }
807         return NULL;
808 }
809
810 static struct ceph_osd_request *
811 __lookup_request_ge(struct ceph_osd_client *osdc,
812                     u64 tid)
813 {
814         struct ceph_osd_request *req;
815         struct rb_node *n = osdc->requests.rb_node;
816
817         while (n) {
818                 req = rb_entry(n, struct ceph_osd_request, r_node);
819                 if (tid < req->r_tid) {
820                         if (!n->rb_left)
821                                 return req;
822                         n = n->rb_left;
823                 } else if (tid > req->r_tid) {
824                         n = n->rb_right;
825                 } else {
826                         return req;
827                 }
828         }
829         return NULL;
830 }
831
832 /*
833  * Resubmit requests pending on the given osd.
834  */
835 static void __kick_osd_requests(struct ceph_osd_client *osdc,
836                                 struct ceph_osd *osd)
837 {
838         struct ceph_osd_request *req, *nreq;
839         LIST_HEAD(resend);
840         int err;
841
842         dout("__kick_osd_requests osd%d\n", osd->o_osd);
843         err = __reset_osd(osdc, osd);
844         if (err)
845                 return;
846         /*
847          * Build up a list of requests to resend by traversing the
848          * osd's list of requests.  Requests for a given object are
849          * sent in tid order, and that is also the order they're
850          * kept on this list.  Therefore all requests that are in
851          * flight will be found first, followed by all requests that
852          * have not yet been sent.  And to resend requests while
853          * preserving this order we will want to put any sent
854          * requests back on the front of the osd client's unsent
855          * list.
856          *
857          * So we build a separate ordered list of already-sent
858          * requests for the affected osd and splice it onto the
859          * front of the osd client's unsent list.  Once we've seen a
860          * request that has not yet been sent we're done.  Those
861          * requests are already sitting right where they belong.
862          */
863         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
864                 if (!req->r_sent)
865                         break;
866                 list_move_tail(&req->r_req_lru_item, &resend);
867                 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
868                      osd->o_osd);
869                 if (!req->r_linger)
870                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
871         }
872         list_splice(&resend, &osdc->req_unsent);
873
874         /*
875          * Linger requests are re-registered before sending, which
876          * sets up a new tid for each.  We add them to the unsent
877          * list at the end to keep things in tid order.
878          */
879         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
880                                  r_linger_osd) {
881                 /*
882                  * reregister request prior to unregistering linger so
883                  * that r_osd is preserved.
884                  */
885                 BUG_ON(!list_empty(&req->r_req_lru_item));
886                 __register_request(osdc, req);
887                 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
888                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
889                 __unregister_linger_request(osdc, req);
890                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
891                      osd->o_osd);
892         }
893 }
894
895 /*
896  * If the osd connection drops, we need to resubmit all requests.
897  */
898 static void osd_reset(struct ceph_connection *con)
899 {
900         struct ceph_osd *osd = con->private;
901         struct ceph_osd_client *osdc;
902
903         if (!osd)
904                 return;
905         dout("osd_reset osd%d\n", osd->o_osd);
906         osdc = osd->o_osdc;
907         down_read(&osdc->map_sem);
908         mutex_lock(&osdc->request_mutex);
909         __kick_osd_requests(osdc, osd);
910         __send_queued(osdc);
911         mutex_unlock(&osdc->request_mutex);
912         up_read(&osdc->map_sem);
913 }
914
915 /*
916  * Track open sessions with osds.
917  */
918 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
919 {
920         struct ceph_osd *osd;
921
922         osd = kzalloc(sizeof(*osd), GFP_NOFS);
923         if (!osd)
924                 return NULL;
925
926         atomic_set(&osd->o_ref, 1);
927         osd->o_osdc = osdc;
928         osd->o_osd = onum;
929         RB_CLEAR_NODE(&osd->o_node);
930         INIT_LIST_HEAD(&osd->o_requests);
931         INIT_LIST_HEAD(&osd->o_linger_requests);
932         INIT_LIST_HEAD(&osd->o_osd_lru);
933         osd->o_incarnation = 1;
934
935         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
936
937         INIT_LIST_HEAD(&osd->o_keepalive_item);
938         return osd;
939 }
940
941 static struct ceph_osd *get_osd(struct ceph_osd *osd)
942 {
943         if (atomic_inc_not_zero(&osd->o_ref)) {
944                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
945                      atomic_read(&osd->o_ref));
946                 return osd;
947         } else {
948                 dout("get_osd %p FAIL\n", osd);
949                 return NULL;
950         }
951 }
952
953 static void put_osd(struct ceph_osd *osd)
954 {
955         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
956              atomic_read(&osd->o_ref) - 1);
957         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
958                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
959
960                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
961                 kfree(osd);
962         }
963 }
964
965 /*
966  * remove an osd from our map
967  */
968 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
969 {
970         dout("__remove_osd %p\n", osd);
971         BUG_ON(!list_empty(&osd->o_requests));
972         rb_erase(&osd->o_node, &osdc->osds);
973         list_del_init(&osd->o_osd_lru);
974         ceph_con_close(&osd->o_con);
975         put_osd(osd);
976 }
977
978 static void remove_all_osds(struct ceph_osd_client *osdc)
979 {
980         dout("%s %p\n", __func__, osdc);
981         mutex_lock(&osdc->request_mutex);
982         while (!RB_EMPTY_ROOT(&osdc->osds)) {
983                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
984                                                 struct ceph_osd, o_node);
985                 __remove_osd(osdc, osd);
986         }
987         mutex_unlock(&osdc->request_mutex);
988 }
989
990 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
991                               struct ceph_osd *osd)
992 {
993         dout("__move_osd_to_lru %p\n", osd);
994         BUG_ON(!list_empty(&osd->o_osd_lru));
995         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
996         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
997 }
998
999 static void __remove_osd_from_lru(struct ceph_osd *osd)
1000 {
1001         dout("__remove_osd_from_lru %p\n", osd);
1002         if (!list_empty(&osd->o_osd_lru))
1003                 list_del_init(&osd->o_osd_lru);
1004 }
1005
1006 static void remove_old_osds(struct ceph_osd_client *osdc)
1007 {
1008         struct ceph_osd *osd, *nosd;
1009
1010         dout("__remove_old_osds %p\n", osdc);
1011         mutex_lock(&osdc->request_mutex);
1012         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1013                 if (time_before(jiffies, osd->lru_ttl))
1014                         break;
1015                 __remove_osd(osdc, osd);
1016         }
1017         mutex_unlock(&osdc->request_mutex);
1018 }
1019
1020 /*
1021  * reset osd connect
1022  */
1023 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1024 {
1025         struct ceph_entity_addr *peer_addr;
1026
1027         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1028         if (list_empty(&osd->o_requests) &&
1029             list_empty(&osd->o_linger_requests)) {
1030                 __remove_osd(osdc, osd);
1031
1032                 return -ENODEV;
1033         }
1034
1035         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1036         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1037                         !ceph_con_opened(&osd->o_con)) {
1038                 struct ceph_osd_request *req;
1039
1040                 dout(" osd addr hasn't changed and connection never opened,"
1041                      " letting msgr retry");
1042                 /* touch each r_stamp for handle_timeout()'s benfit */
1043                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1044                         req->r_stamp = jiffies;
1045
1046                 return -EAGAIN;
1047         }
1048
1049         ceph_con_close(&osd->o_con);
1050         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1051         osd->o_incarnation++;
1052
1053         return 0;
1054 }
1055
1056 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1057 {
1058         struct rb_node **p = &osdc->osds.rb_node;
1059         struct rb_node *parent = NULL;
1060         struct ceph_osd *osd = NULL;
1061
1062         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1063         while (*p) {
1064                 parent = *p;
1065                 osd = rb_entry(parent, struct ceph_osd, o_node);
1066                 if (new->o_osd < osd->o_osd)
1067                         p = &(*p)->rb_left;
1068                 else if (new->o_osd > osd->o_osd)
1069                         p = &(*p)->rb_right;
1070                 else
1071                         BUG();
1072         }
1073
1074         rb_link_node(&new->o_node, parent, p);
1075         rb_insert_color(&new->o_node, &osdc->osds);
1076 }
1077
1078 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1079 {
1080         struct ceph_osd *osd;
1081         struct rb_node *n = osdc->osds.rb_node;
1082
1083         while (n) {
1084                 osd = rb_entry(n, struct ceph_osd, o_node);
1085                 if (o < osd->o_osd)
1086                         n = n->rb_left;
1087                 else if (o > osd->o_osd)
1088                         n = n->rb_right;
1089                 else
1090                         return osd;
1091         }
1092         return NULL;
1093 }
1094
1095 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1096 {
1097         schedule_delayed_work(&osdc->timeout_work,
1098                         osdc->client->options->osd_keepalive_timeout * HZ);
1099 }
1100
1101 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1102 {
1103         cancel_delayed_work(&osdc->timeout_work);
1104 }
1105
1106 /*
1107  * Register request, assign tid.  If this is the first request, set up
1108  * the timeout event.
1109  */
1110 static void __register_request(struct ceph_osd_client *osdc,
1111                                struct ceph_osd_request *req)
1112 {
1113         req->r_tid = ++osdc->last_tid;
1114         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1115         dout("__register_request %p tid %lld\n", req, req->r_tid);
1116         __insert_request(osdc, req);
1117         ceph_osdc_get_request(req);
1118         osdc->num_requests++;
1119         if (osdc->num_requests == 1) {
1120                 dout(" first request, scheduling timeout\n");
1121                 __schedule_osd_timeout(osdc);
1122         }
1123 }
1124
1125 /*
1126  * called under osdc->request_mutex
1127  */
1128 static void __unregister_request(struct ceph_osd_client *osdc,
1129                                  struct ceph_osd_request *req)
1130 {
1131         if (RB_EMPTY_NODE(&req->r_node)) {
1132                 dout("__unregister_request %p tid %lld not registered\n",
1133                         req, req->r_tid);
1134                 return;
1135         }
1136
1137         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1138         rb_erase(&req->r_node, &osdc->requests);
1139         osdc->num_requests--;
1140
1141         if (req->r_osd) {
1142                 /* make sure the original request isn't in flight. */
1143                 ceph_msg_revoke(req->r_request);
1144
1145                 list_del_init(&req->r_osd_item);
1146                 if (list_empty(&req->r_osd->o_requests) &&
1147                     list_empty(&req->r_osd->o_linger_requests)) {
1148                         dout("moving osd to %p lru\n", req->r_osd);
1149                         __move_osd_to_lru(osdc, req->r_osd);
1150                 }
1151                 if (list_empty(&req->r_linger_item))
1152                         req->r_osd = NULL;
1153         }
1154
1155         list_del_init(&req->r_req_lru_item);
1156         ceph_osdc_put_request(req);
1157
1158         if (osdc->num_requests == 0) {
1159                 dout(" no requests, canceling timeout\n");
1160                 __cancel_osd_timeout(osdc);
1161         }
1162 }
1163
1164 /*
1165  * Cancel a previously queued request message
1166  */
1167 static void __cancel_request(struct ceph_osd_request *req)
1168 {
1169         if (req->r_sent && req->r_osd) {
1170                 ceph_msg_revoke(req->r_request);
1171                 req->r_sent = 0;
1172         }
1173 }
1174
1175 static void __register_linger_request(struct ceph_osd_client *osdc,
1176                                     struct ceph_osd_request *req)
1177 {
1178         dout("__register_linger_request %p\n", req);
1179         ceph_osdc_get_request(req);
1180         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1181         if (req->r_osd)
1182                 list_add_tail(&req->r_linger_osd,
1183                               &req->r_osd->o_linger_requests);
1184 }
1185
1186 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1187                                         struct ceph_osd_request *req)
1188 {
1189         dout("__unregister_linger_request %p\n", req);
1190         list_del_init(&req->r_linger_item);
1191         if (req->r_osd) {
1192                 list_del_init(&req->r_linger_osd);
1193
1194                 if (list_empty(&req->r_osd->o_requests) &&
1195                     list_empty(&req->r_osd->o_linger_requests)) {
1196                         dout("moving osd to %p lru\n", req->r_osd);
1197                         __move_osd_to_lru(osdc, req->r_osd);
1198                 }
1199                 if (list_empty(&req->r_osd_item))
1200                         req->r_osd = NULL;
1201         }
1202         ceph_osdc_put_request(req);
1203 }
1204
1205 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1206                                          struct ceph_osd_request *req)
1207 {
1208         mutex_lock(&osdc->request_mutex);
1209         if (req->r_linger) {
1210                 req->r_linger = 0;
1211                 __unregister_linger_request(osdc, req);
1212         }
1213         mutex_unlock(&osdc->request_mutex);
1214 }
1215 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1216
1217 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1218                                   struct ceph_osd_request *req)
1219 {
1220         if (!req->r_linger) {
1221                 dout("set_request_linger %p\n", req);
1222                 req->r_linger = 1;
1223         }
1224 }
1225 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1226
1227 /*
1228  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1229  * (as needed), and set the request r_osd appropriately.  If there is
1230  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1231  * (unsent, homeless) or leave on in-flight lru.
1232  *
1233  * Return 0 if unchanged, 1 if changed, or negative on error.
1234  *
1235  * Caller should hold map_sem for read and request_mutex.
1236  */
1237 static int __map_request(struct ceph_osd_client *osdc,
1238                          struct ceph_osd_request *req, int force_resend)
1239 {
1240         struct ceph_pg pgid;
1241         int acting[CEPH_PG_MAX_SIZE];
1242         int o = -1, num = 0;
1243         int err;
1244
1245         dout("map_request %p tid %lld\n", req, req->r_tid);
1246         err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
1247                                 ceph_file_layout_pg_pool(req->r_file_layout));
1248         if (err) {
1249                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1250                 return err;
1251         }
1252         req->r_pgid = pgid;
1253
1254         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1255         if (err > 0) {
1256                 o = acting[0];
1257                 num = err;
1258         }
1259
1260         if ((!force_resend &&
1261              req->r_osd && req->r_osd->o_osd == o &&
1262              req->r_sent >= req->r_osd->o_incarnation &&
1263              req->r_num_pg_osds == num &&
1264              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1265             (req->r_osd == NULL && o == -1))
1266                 return 0;  /* no change */
1267
1268         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1269              req->r_tid, pgid.pool, pgid.seed, o,
1270              req->r_osd ? req->r_osd->o_osd : -1);
1271
1272         /* record full pg acting set */
1273         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1274         req->r_num_pg_osds = num;
1275
1276         if (req->r_osd) {
1277                 __cancel_request(req);
1278                 list_del_init(&req->r_osd_item);
1279                 req->r_osd = NULL;
1280         }
1281
1282         req->r_osd = __lookup_osd(osdc, o);
1283         if (!req->r_osd && o >= 0) {
1284                 err = -ENOMEM;
1285                 req->r_osd = create_osd(osdc, o);
1286                 if (!req->r_osd) {
1287                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1288                         goto out;
1289                 }
1290
1291                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1292                 __insert_osd(osdc, req->r_osd);
1293
1294                 ceph_con_open(&req->r_osd->o_con,
1295                               CEPH_ENTITY_TYPE_OSD, o,
1296                               &osdc->osdmap->osd_addr[o]);
1297         }
1298
1299         if (req->r_osd) {
1300                 __remove_osd_from_lru(req->r_osd);
1301                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1302                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1303         } else {
1304                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1305         }
1306         err = 1;   /* osd or pg changed */
1307
1308 out:
1309         return err;
1310 }
1311
1312 /*
1313  * caller should hold map_sem (for read) and request_mutex
1314  */
1315 static void __send_request(struct ceph_osd_client *osdc,
1316                            struct ceph_osd_request *req)
1317 {
1318         void *p;
1319
1320         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1321              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1322              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1323
1324         /* fill in message content that changes each time we send it */
1325         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1326         put_unaligned_le32(req->r_flags, req->r_request_flags);
1327         put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
1328         p = req->r_request_pgid;
1329         ceph_encode_64(&p, req->r_pgid.pool);
1330         ceph_encode_32(&p, req->r_pgid.seed);
1331         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1332         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1333                sizeof(req->r_reassert_version));
1334
1335         req->r_stamp = jiffies;
1336         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1337
1338         ceph_msg_get(req->r_request); /* send consumes a ref */
1339
1340         req->r_sent = req->r_osd->o_incarnation;
1341
1342         ceph_con_send(&req->r_osd->o_con, req->r_request);
1343 }
1344
1345 /*
1346  * Send any requests in the queue (req_unsent).
1347  */
1348 static void __send_queued(struct ceph_osd_client *osdc)
1349 {
1350         struct ceph_osd_request *req, *tmp;
1351
1352         dout("__send_queued\n");
1353         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1354                 __send_request(osdc, req);
1355 }
1356
1357 /*
1358  * Timeout callback, called every N seconds when 1 or more osd
1359  * requests has been active for more than N seconds.  When this
1360  * happens, we ping all OSDs with requests who have timed out to
1361  * ensure any communications channel reset is detected.  Reset the
1362  * request timeouts another N seconds in the future as we go.
1363  * Reschedule the timeout event another N seconds in future (unless
1364  * there are no open requests).
1365  */
1366 static void handle_timeout(struct work_struct *work)
1367 {
1368         struct ceph_osd_client *osdc =
1369                 container_of(work, struct ceph_osd_client, timeout_work.work);
1370         struct ceph_osd_request *req;
1371         struct ceph_osd *osd;
1372         unsigned long keepalive =
1373                 osdc->client->options->osd_keepalive_timeout * HZ;
1374         struct list_head slow_osds;
1375         dout("timeout\n");
1376         down_read(&osdc->map_sem);
1377
1378         ceph_monc_request_next_osdmap(&osdc->client->monc);
1379
1380         mutex_lock(&osdc->request_mutex);
1381
1382         /*
1383          * ping osds that are a bit slow.  this ensures that if there
1384          * is a break in the TCP connection we will notice, and reopen
1385          * a connection with that osd (from the fault callback).
1386          */
1387         INIT_LIST_HEAD(&slow_osds);
1388         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1389                 if (time_before(jiffies, req->r_stamp + keepalive))
1390                         break;
1391
1392                 osd = req->r_osd;
1393                 BUG_ON(!osd);
1394                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1395                      req->r_tid, osd->o_osd);
1396                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1397         }
1398         while (!list_empty(&slow_osds)) {
1399                 osd = list_entry(slow_osds.next, struct ceph_osd,
1400                                  o_keepalive_item);
1401                 list_del_init(&osd->o_keepalive_item);
1402                 ceph_con_keepalive(&osd->o_con);
1403         }
1404
1405         __schedule_osd_timeout(osdc);
1406         __send_queued(osdc);
1407         mutex_unlock(&osdc->request_mutex);
1408         up_read(&osdc->map_sem);
1409 }
1410
1411 static void handle_osds_timeout(struct work_struct *work)
1412 {
1413         struct ceph_osd_client *osdc =
1414                 container_of(work, struct ceph_osd_client,
1415                              osds_timeout_work.work);
1416         unsigned long delay =
1417                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1418
1419         dout("osds timeout\n");
1420         down_read(&osdc->map_sem);
1421         remove_old_osds(osdc);
1422         up_read(&osdc->map_sem);
1423
1424         schedule_delayed_work(&osdc->osds_timeout_work,
1425                               round_jiffies_relative(delay));
1426 }
1427
1428 static void complete_request(struct ceph_osd_request *req)
1429 {
1430         complete_all(&req->r_safe_completion);  /* fsync waiter */
1431 }
1432
1433 /*
1434  * handle osd op reply.  either call the callback if it is specified,
1435  * or do the completion to wake up the waiting thread.
1436  */
1437 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1438                          struct ceph_connection *con)
1439 {
1440         void *p, *end;
1441         struct ceph_osd_request *req;
1442         u64 tid;
1443         int object_len;
1444         unsigned int numops;
1445         int payload_len, flags;
1446         s32 result;
1447         s32 retry_attempt;
1448         struct ceph_pg pg;
1449         int err;
1450         u32 reassert_epoch;
1451         u64 reassert_version;
1452         u32 osdmap_epoch;
1453         int already_completed;
1454         u32 bytes;
1455         unsigned int i;
1456
1457         tid = le64_to_cpu(msg->hdr.tid);
1458         dout("handle_reply %p tid %llu\n", msg, tid);
1459
1460         p = msg->front.iov_base;
1461         end = p + msg->front.iov_len;
1462
1463         ceph_decode_need(&p, end, 4, bad);
1464         object_len = ceph_decode_32(&p);
1465         ceph_decode_need(&p, end, object_len, bad);
1466         p += object_len;
1467
1468         err = ceph_decode_pgid(&p, end, &pg);
1469         if (err)
1470                 goto bad;
1471
1472         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1473         flags = ceph_decode_64(&p);
1474         result = ceph_decode_32(&p);
1475         reassert_epoch = ceph_decode_32(&p);
1476         reassert_version = ceph_decode_64(&p);
1477         osdmap_epoch = ceph_decode_32(&p);
1478
1479         /* lookup */
1480         mutex_lock(&osdc->request_mutex);
1481         req = __lookup_request(osdc, tid);
1482         if (req == NULL) {
1483                 dout("handle_reply tid %llu dne\n", tid);
1484                 goto bad_mutex;
1485         }
1486         ceph_osdc_get_request(req);
1487
1488         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1489              req, result);
1490
1491         ceph_decode_need(&p, end, 4, bad);
1492         numops = ceph_decode_32(&p);
1493         if (numops > CEPH_OSD_MAX_OP)
1494                 goto bad_put;
1495         if (numops != req->r_num_ops)
1496                 goto bad_put;
1497         payload_len = 0;
1498         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
1499         for (i = 0; i < numops; i++) {
1500                 struct ceph_osd_op *op = p;
1501                 int len;
1502
1503                 len = le32_to_cpu(op->payload_len);
1504                 req->r_reply_op_len[i] = len;
1505                 dout(" op %d has %d bytes\n", i, len);
1506                 payload_len += len;
1507                 p += sizeof(*op);
1508         }
1509         bytes = le32_to_cpu(msg->hdr.data_len);
1510         if (payload_len != bytes) {
1511                 pr_warning("sum of op payload lens %d != data_len %d",
1512                            payload_len, bytes);
1513                 goto bad_put;
1514         }
1515
1516         ceph_decode_need(&p, end, 4 + numops * 4, bad);
1517         retry_attempt = ceph_decode_32(&p);
1518         for (i = 0; i < numops; i++)
1519                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1520
1521         already_completed = req->r_got_reply;
1522
1523         if (!req->r_got_reply) {
1524
1525                 req->r_result = result;
1526                 dout("handle_reply result %d bytes %d\n", req->r_result,
1527                      bytes);
1528                 if (req->r_result == 0)
1529                         req->r_result = bytes;
1530
1531                 /* in case this is a write and we need to replay, */
1532                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1533                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1534
1535                 req->r_got_reply = 1;
1536         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1537                 dout("handle_reply tid %llu dup ack\n", tid);
1538                 mutex_unlock(&osdc->request_mutex);
1539                 goto done;
1540         }
1541
1542         dout("handle_reply tid %llu flags %d\n", tid, flags);
1543
1544         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1545                 __register_linger_request(osdc, req);
1546
1547         /* either this is a read, or we got the safe response */
1548         if (result < 0 ||
1549             (flags & CEPH_OSD_FLAG_ONDISK) ||
1550             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1551                 __unregister_request(osdc, req);
1552
1553         mutex_unlock(&osdc->request_mutex);
1554
1555         if (!already_completed) {
1556                 if (req->r_unsafe_callback &&
1557                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1558                         req->r_unsafe_callback(req, true);
1559                 if (req->r_callback)
1560                         req->r_callback(req, msg);
1561                 else
1562                         complete_all(&req->r_completion);
1563         }
1564
1565         if (flags & CEPH_OSD_FLAG_ONDISK) {
1566                 if (req->r_unsafe_callback && already_completed)
1567                         req->r_unsafe_callback(req, false);
1568                 complete_request(req);
1569         }
1570
1571 done:
1572         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1573         ceph_osdc_put_request(req);
1574         return;
1575
1576 bad_put:
1577         ceph_osdc_put_request(req);
1578 bad_mutex:
1579         mutex_unlock(&osdc->request_mutex);
1580 bad:
1581         pr_err("corrupt osd_op_reply got %d %d\n",
1582                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1583         ceph_msg_dump(msg);
1584 }
1585
1586 static void reset_changed_osds(struct ceph_osd_client *osdc)
1587 {
1588         struct rb_node *p, *n;
1589
1590         for (p = rb_first(&osdc->osds); p; p = n) {
1591                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1592
1593                 n = rb_next(p);
1594                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1595                     memcmp(&osd->o_con.peer_addr,
1596                            ceph_osd_addr(osdc->osdmap,
1597                                          osd->o_osd),
1598                            sizeof(struct ceph_entity_addr)) != 0)
1599                         __reset_osd(osdc, osd);
1600         }
1601 }
1602
1603 /*
1604  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1605  * no osd, request a new map.
1606  *
1607  * Caller should hold map_sem for read.
1608  */
1609 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1610 {
1611         struct ceph_osd_request *req, *nreq;
1612         struct rb_node *p;
1613         int needmap = 0;
1614         int err;
1615
1616         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1617         mutex_lock(&osdc->request_mutex);
1618         for (p = rb_first(&osdc->requests); p; ) {
1619                 req = rb_entry(p, struct ceph_osd_request, r_node);
1620                 p = rb_next(p);
1621
1622                 /*
1623                  * For linger requests that have not yet been
1624                  * registered, move them to the linger list; they'll
1625                  * be sent to the osd in the loop below.  Unregister
1626                  * the request before re-registering it as a linger
1627                  * request to ensure the __map_request() below
1628                  * will decide it needs to be sent.
1629                  */
1630                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1631                         dout("%p tid %llu restart on osd%d\n",
1632                              req, req->r_tid,
1633                              req->r_osd ? req->r_osd->o_osd : -1);
1634                         ceph_osdc_get_request(req);
1635                         __unregister_request(osdc, req);
1636                         __register_linger_request(osdc, req);
1637                         ceph_osdc_put_request(req);
1638                         continue;
1639                 }
1640
1641                 err = __map_request(osdc, req, force_resend);
1642                 if (err < 0)
1643                         continue;  /* error */
1644                 if (req->r_osd == NULL) {
1645                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1646                         needmap++;  /* request a newer map */
1647                 } else if (err > 0) {
1648                         if (!req->r_linger) {
1649                                 dout("%p tid %llu requeued on osd%d\n", req,
1650                                      req->r_tid,
1651                                      req->r_osd ? req->r_osd->o_osd : -1);
1652                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1653                         }
1654                 }
1655         }
1656
1657         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1658                                  r_linger_item) {
1659                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1660
1661                 err = __map_request(osdc, req, force_resend);
1662                 dout("__map_request returned %d\n", err);
1663                 if (err == 0)
1664                         continue;  /* no change and no osd was specified */
1665                 if (err < 0)
1666                         continue;  /* hrm! */
1667                 if (req->r_osd == NULL) {
1668                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1669                         needmap++;  /* request a newer map */
1670                         continue;
1671                 }
1672
1673                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1674                      req->r_osd ? req->r_osd->o_osd : -1);
1675                 __register_request(osdc, req);
1676                 __unregister_linger_request(osdc, req);
1677         }
1678         reset_changed_osds(osdc);
1679         mutex_unlock(&osdc->request_mutex);
1680
1681         if (needmap) {
1682                 dout("%d requests for down osds, need new map\n", needmap);
1683                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1684         }
1685 }
1686
1687
1688 /*
1689  * Process updated osd map.
1690  *
1691  * The message contains any number of incremental and full maps, normally
1692  * indicating some sort of topology change in the cluster.  Kick requests
1693  * off to different OSDs as needed.
1694  */
1695 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1696 {
1697         void *p, *end, *next;
1698         u32 nr_maps, maplen;
1699         u32 epoch;
1700         struct ceph_osdmap *newmap = NULL, *oldmap;
1701         int err;
1702         struct ceph_fsid fsid;
1703
1704         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1705         p = msg->front.iov_base;
1706         end = p + msg->front.iov_len;
1707
1708         /* verify fsid */
1709         ceph_decode_need(&p, end, sizeof(fsid), bad);
1710         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1711         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1712                 return;
1713
1714         down_write(&osdc->map_sem);
1715
1716         /* incremental maps */
1717         ceph_decode_32_safe(&p, end, nr_maps, bad);
1718         dout(" %d inc maps\n", nr_maps);
1719         while (nr_maps > 0) {
1720                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1721                 epoch = ceph_decode_32(&p);
1722                 maplen = ceph_decode_32(&p);
1723                 ceph_decode_need(&p, end, maplen, bad);
1724                 next = p + maplen;
1725                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1726                         dout("applying incremental map %u len %d\n",
1727                              epoch, maplen);
1728                         newmap = osdmap_apply_incremental(&p, next,
1729                                                           osdc->osdmap,
1730                                                           &osdc->client->msgr);
1731                         if (IS_ERR(newmap)) {
1732                                 err = PTR_ERR(newmap);
1733                                 goto bad;
1734                         }
1735                         BUG_ON(!newmap);
1736                         if (newmap != osdc->osdmap) {
1737                                 ceph_osdmap_destroy(osdc->osdmap);
1738                                 osdc->osdmap = newmap;
1739                         }
1740                         kick_requests(osdc, 0);
1741                 } else {
1742                         dout("ignoring incremental map %u len %d\n",
1743                              epoch, maplen);
1744                 }
1745                 p = next;
1746                 nr_maps--;
1747         }
1748         if (newmap)
1749                 goto done;
1750
1751         /* full maps */
1752         ceph_decode_32_safe(&p, end, nr_maps, bad);
1753         dout(" %d full maps\n", nr_maps);
1754         while (nr_maps) {
1755                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1756                 epoch = ceph_decode_32(&p);
1757                 maplen = ceph_decode_32(&p);
1758                 ceph_decode_need(&p, end, maplen, bad);
1759                 if (nr_maps > 1) {
1760                         dout("skipping non-latest full map %u len %d\n",
1761                              epoch, maplen);
1762                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1763                         dout("skipping full map %u len %d, "
1764                              "older than our %u\n", epoch, maplen,
1765                              osdc->osdmap->epoch);
1766                 } else {
1767                         int skipped_map = 0;
1768
1769                         dout("taking full map %u len %d\n", epoch, maplen);
1770                         newmap = osdmap_decode(&p, p+maplen);
1771                         if (IS_ERR(newmap)) {
1772                                 err = PTR_ERR(newmap);
1773                                 goto bad;
1774                         }
1775                         BUG_ON(!newmap);
1776                         oldmap = osdc->osdmap;
1777                         osdc->osdmap = newmap;
1778                         if (oldmap) {
1779                                 if (oldmap->epoch + 1 < newmap->epoch)
1780                                         skipped_map = 1;
1781                                 ceph_osdmap_destroy(oldmap);
1782                         }
1783                         kick_requests(osdc, skipped_map);
1784                 }
1785                 p += maplen;
1786                 nr_maps--;
1787         }
1788
1789 done:
1790         downgrade_write(&osdc->map_sem);
1791         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1792
1793         /*
1794          * subscribe to subsequent osdmap updates if full to ensure
1795          * we find out when we are no longer full and stop returning
1796          * ENOSPC.
1797          */
1798         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1799                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1800
1801         mutex_lock(&osdc->request_mutex);
1802         __send_queued(osdc);
1803         mutex_unlock(&osdc->request_mutex);
1804         up_read(&osdc->map_sem);
1805         wake_up_all(&osdc->client->auth_wq);
1806         return;
1807
1808 bad:
1809         pr_err("osdc handle_map corrupt msg\n");
1810         ceph_msg_dump(msg);
1811         up_write(&osdc->map_sem);
1812         return;
1813 }
1814
1815 /*
1816  * watch/notify callback event infrastructure
1817  *
1818  * These callbacks are used both for watch and notify operations.
1819  */
1820 static void __release_event(struct kref *kref)
1821 {
1822         struct ceph_osd_event *event =
1823                 container_of(kref, struct ceph_osd_event, kref);
1824
1825         dout("__release_event %p\n", event);
1826         kfree(event);
1827 }
1828
1829 static void get_event(struct ceph_osd_event *event)
1830 {
1831         kref_get(&event->kref);
1832 }
1833
1834 void ceph_osdc_put_event(struct ceph_osd_event *event)
1835 {
1836         kref_put(&event->kref, __release_event);
1837 }
1838 EXPORT_SYMBOL(ceph_osdc_put_event);
1839
1840 static void __insert_event(struct ceph_osd_client *osdc,
1841                              struct ceph_osd_event *new)
1842 {
1843         struct rb_node **p = &osdc->event_tree.rb_node;
1844         struct rb_node *parent = NULL;
1845         struct ceph_osd_event *event = NULL;
1846
1847         while (*p) {
1848                 parent = *p;
1849                 event = rb_entry(parent, struct ceph_osd_event, node);
1850                 if (new->cookie < event->cookie)
1851                         p = &(*p)->rb_left;
1852                 else if (new->cookie > event->cookie)
1853                         p = &(*p)->rb_right;
1854                 else
1855                         BUG();
1856         }
1857
1858         rb_link_node(&new->node, parent, p);
1859         rb_insert_color(&new->node, &osdc->event_tree);
1860 }
1861
1862 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1863                                                 u64 cookie)
1864 {
1865         struct rb_node **p = &osdc->event_tree.rb_node;
1866         struct rb_node *parent = NULL;
1867         struct ceph_osd_event *event = NULL;
1868
1869         while (*p) {
1870                 parent = *p;
1871                 event = rb_entry(parent, struct ceph_osd_event, node);
1872                 if (cookie < event->cookie)
1873                         p = &(*p)->rb_left;
1874                 else if (cookie > event->cookie)
1875                         p = &(*p)->rb_right;
1876                 else
1877                         return event;
1878         }
1879         return NULL;
1880 }
1881
1882 static void __remove_event(struct ceph_osd_event *event)
1883 {
1884         struct ceph_osd_client *osdc = event->osdc;
1885
1886         if (!RB_EMPTY_NODE(&event->node)) {
1887                 dout("__remove_event removed %p\n", event);
1888                 rb_erase(&event->node, &osdc->event_tree);
1889                 ceph_osdc_put_event(event);
1890         } else {
1891                 dout("__remove_event didn't remove %p\n", event);
1892         }
1893 }
1894
1895 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1896                            void (*event_cb)(u64, u64, u8, void *),
1897                            void *data, struct ceph_osd_event **pevent)
1898 {
1899         struct ceph_osd_event *event;
1900
1901         event = kmalloc(sizeof(*event), GFP_NOIO);
1902         if (!event)
1903                 return -ENOMEM;
1904
1905         dout("create_event %p\n", event);
1906         event->cb = event_cb;
1907         event->one_shot = 0;
1908         event->data = data;
1909         event->osdc = osdc;
1910         INIT_LIST_HEAD(&event->osd_node);
1911         RB_CLEAR_NODE(&event->node);
1912         kref_init(&event->kref);   /* one ref for us */
1913         kref_get(&event->kref);    /* one ref for the caller */
1914
1915         spin_lock(&osdc->event_lock);
1916         event->cookie = ++osdc->event_count;
1917         __insert_event(osdc, event);
1918         spin_unlock(&osdc->event_lock);
1919
1920         *pevent = event;
1921         return 0;
1922 }
1923 EXPORT_SYMBOL(ceph_osdc_create_event);
1924
1925 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1926 {
1927         struct ceph_osd_client *osdc = event->osdc;
1928
1929         dout("cancel_event %p\n", event);
1930         spin_lock(&osdc->event_lock);
1931         __remove_event(event);
1932         spin_unlock(&osdc->event_lock);
1933         ceph_osdc_put_event(event); /* caller's */
1934 }
1935 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1936
1937
1938 static void do_event_work(struct work_struct *work)
1939 {
1940         struct ceph_osd_event_work *event_work =
1941                 container_of(work, struct ceph_osd_event_work, work);
1942         struct ceph_osd_event *event = event_work->event;
1943         u64 ver = event_work->ver;
1944         u64 notify_id = event_work->notify_id;
1945         u8 opcode = event_work->opcode;
1946
1947         dout("do_event_work completing %p\n", event);
1948         event->cb(ver, notify_id, opcode, event->data);
1949         dout("do_event_work completed %p\n", event);
1950         ceph_osdc_put_event(event);
1951         kfree(event_work);
1952 }
1953
1954
1955 /*
1956  * Process osd watch notifications
1957  */
1958 static void handle_watch_notify(struct ceph_osd_client *osdc,
1959                                 struct ceph_msg *msg)
1960 {
1961         void *p, *end;
1962         u8 proto_ver;
1963         u64 cookie, ver, notify_id;
1964         u8 opcode;
1965         struct ceph_osd_event *event;
1966         struct ceph_osd_event_work *event_work;
1967
1968         p = msg->front.iov_base;
1969         end = p + msg->front.iov_len;
1970
1971         ceph_decode_8_safe(&p, end, proto_ver, bad);
1972         ceph_decode_8_safe(&p, end, opcode, bad);
1973         ceph_decode_64_safe(&p, end, cookie, bad);
1974         ceph_decode_64_safe(&p, end, ver, bad);
1975         ceph_decode_64_safe(&p, end, notify_id, bad);
1976
1977         spin_lock(&osdc->event_lock);
1978         event = __find_event(osdc, cookie);
1979         if (event) {
1980                 BUG_ON(event->one_shot);
1981                 get_event(event);
1982         }
1983         spin_unlock(&osdc->event_lock);
1984         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1985              cookie, ver, event);
1986         if (event) {
1987                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1988                 if (!event_work) {
1989                         dout("ERROR: could not allocate event_work\n");
1990                         goto done_err;
1991                 }
1992                 INIT_WORK(&event_work->work, do_event_work);
1993                 event_work->event = event;
1994                 event_work->ver = ver;
1995                 event_work->notify_id = notify_id;
1996                 event_work->opcode = opcode;
1997                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1998                         dout("WARNING: failed to queue notify event work\n");
1999                         goto done_err;
2000                 }
2001         }
2002
2003         return;
2004
2005 done_err:
2006         ceph_osdc_put_event(event);
2007         return;
2008
2009 bad:
2010         pr_err("osdc handle_watch_notify corrupt msg\n");
2011         return;
2012 }
2013
2014 /*
2015  * build new request AND message
2016  *
2017  */
2018 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2019                                 struct ceph_snap_context *snapc, u64 snap_id,
2020                                 struct timespec *mtime)
2021 {
2022         struct ceph_msg *msg = req->r_request;
2023         void *p;
2024         size_t msg_size;
2025         int flags = req->r_flags;
2026         u64 data_len;
2027         unsigned int i;
2028
2029         req->r_snapid = snap_id;
2030         req->r_snapc = ceph_get_snap_context(snapc);
2031
2032         /* encode request */
2033         msg->hdr.version = cpu_to_le16(4);
2034
2035         p = msg->front.iov_base;
2036         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2037         req->r_request_osdmap_epoch = p;
2038         p += 4;
2039         req->r_request_flags = p;
2040         p += 4;
2041         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2042                 ceph_encode_timespec(p, mtime);
2043         p += sizeof(struct ceph_timespec);
2044         req->r_request_reassert_version = p;
2045         p += sizeof(struct ceph_eversion); /* will get filled in */
2046
2047         /* oloc */
2048         ceph_encode_8(&p, 4);
2049         ceph_encode_8(&p, 4);
2050         ceph_encode_32(&p, 8 + 4 + 4);
2051         req->r_request_pool = p;
2052         p += 8;
2053         ceph_encode_32(&p, -1);  /* preferred */
2054         ceph_encode_32(&p, 0);   /* key len */
2055
2056         ceph_encode_8(&p, 1);
2057         req->r_request_pgid = p;
2058         p += 8 + 4;
2059         ceph_encode_32(&p, -1);  /* preferred */
2060
2061         /* oid */
2062         ceph_encode_32(&p, req->r_oid_len);
2063         memcpy(p, req->r_oid, req->r_oid_len);
2064         dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
2065         p += req->r_oid_len;
2066
2067         /* ops--can imply data */
2068         ceph_encode_16(&p, (u16)req->r_num_ops);
2069         data_len = 0;
2070         for (i = 0; i < req->r_num_ops; i++) {
2071                 data_len += osd_req_encode_op(req, p, i);
2072                 p += sizeof(struct ceph_osd_op);
2073         }
2074
2075         /* snaps */
2076         ceph_encode_64(&p, req->r_snapid);
2077         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2078         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2079         if (req->r_snapc) {
2080                 for (i = 0; i < snapc->num_snaps; i++) {
2081                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2082                 }
2083         }
2084
2085         req->r_request_attempts = p;
2086         p += 4;
2087
2088         /* data */
2089         if (flags & CEPH_OSD_FLAG_WRITE) {
2090                 u16 data_off;
2091
2092                 /*
2093                  * The header "data_off" is a hint to the receiver
2094                  * allowing it to align received data into its
2095                  * buffers such that there's no need to re-copy
2096                  * it before writing it to disk (direct I/O).
2097                  */
2098                 data_off = (u16) (off & 0xffff);
2099                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2100         }
2101         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2102
2103         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2104         msg_size = p - msg->front.iov_base;
2105         msg->front.iov_len = msg_size;
2106         msg->hdr.front_len = cpu_to_le32(msg_size);
2107
2108         dout("build_request msg_size was %d\n", (int)msg_size);
2109 }
2110 EXPORT_SYMBOL(ceph_osdc_build_request);
2111
2112 /*
2113  * Register request, send initial attempt.
2114  */
2115 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2116                             struct ceph_osd_request *req,
2117                             bool nofail)
2118 {
2119         int rc = 0;
2120
2121         down_read(&osdc->map_sem);
2122         mutex_lock(&osdc->request_mutex);
2123         __register_request(osdc, req);
2124         req->r_sent = 0;
2125         req->r_got_reply = 0;
2126         rc = __map_request(osdc, req, 0);
2127         if (rc < 0) {
2128                 if (nofail) {
2129                         dout("osdc_start_request failed map, "
2130                                 " will retry %lld\n", req->r_tid);
2131                         rc = 0;
2132                 } else {
2133                         __unregister_request(osdc, req);
2134                 }
2135                 goto out_unlock;
2136         }
2137         if (req->r_osd == NULL) {
2138                 dout("send_request %p no up osds in pg\n", req);
2139                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2140         } else {
2141                 __send_queued(osdc);
2142         }
2143         rc = 0;
2144 out_unlock:
2145         mutex_unlock(&osdc->request_mutex);
2146         up_read(&osdc->map_sem);
2147         return rc;
2148 }
2149 EXPORT_SYMBOL(ceph_osdc_start_request);
2150
2151 /*
2152  * wait for a request to complete
2153  */
2154 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2155                            struct ceph_osd_request *req)
2156 {
2157         int rc;
2158
2159         rc = wait_for_completion_interruptible(&req->r_completion);
2160         if (rc < 0) {
2161                 mutex_lock(&osdc->request_mutex);
2162                 __cancel_request(req);
2163                 __unregister_request(osdc, req);
2164                 mutex_unlock(&osdc->request_mutex);
2165                 complete_request(req);
2166                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2167                 return rc;
2168         }
2169
2170         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2171         return req->r_result;
2172 }
2173 EXPORT_SYMBOL(ceph_osdc_wait_request);
2174
2175 /*
2176  * sync - wait for all in-flight requests to flush.  avoid starvation.
2177  */
2178 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2179 {
2180         struct ceph_osd_request *req;
2181         u64 last_tid, next_tid = 0;
2182
2183         mutex_lock(&osdc->request_mutex);
2184         last_tid = osdc->last_tid;
2185         while (1) {
2186                 req = __lookup_request_ge(osdc, next_tid);
2187                 if (!req)
2188                         break;
2189                 if (req->r_tid > last_tid)
2190                         break;
2191
2192                 next_tid = req->r_tid + 1;
2193                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2194                         continue;
2195
2196                 ceph_osdc_get_request(req);
2197                 mutex_unlock(&osdc->request_mutex);
2198                 dout("sync waiting on tid %llu (last is %llu)\n",
2199                      req->r_tid, last_tid);
2200                 wait_for_completion(&req->r_safe_completion);
2201                 mutex_lock(&osdc->request_mutex);
2202                 ceph_osdc_put_request(req);
2203         }
2204         mutex_unlock(&osdc->request_mutex);
2205         dout("sync done (thru tid %llu)\n", last_tid);
2206 }
2207 EXPORT_SYMBOL(ceph_osdc_sync);
2208
2209 /*
2210  * init, shutdown
2211  */
2212 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2213 {
2214         int err;
2215
2216         dout("init\n");
2217         osdc->client = client;
2218         osdc->osdmap = NULL;
2219         init_rwsem(&osdc->map_sem);
2220         init_completion(&osdc->map_waiters);
2221         osdc->last_requested_map = 0;
2222         mutex_init(&osdc->request_mutex);
2223         osdc->last_tid = 0;
2224         osdc->osds = RB_ROOT;
2225         INIT_LIST_HEAD(&osdc->osd_lru);
2226         osdc->requests = RB_ROOT;
2227         INIT_LIST_HEAD(&osdc->req_lru);
2228         INIT_LIST_HEAD(&osdc->req_unsent);
2229         INIT_LIST_HEAD(&osdc->req_notarget);
2230         INIT_LIST_HEAD(&osdc->req_linger);
2231         osdc->num_requests = 0;
2232         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2233         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2234         spin_lock_init(&osdc->event_lock);
2235         osdc->event_tree = RB_ROOT;
2236         osdc->event_count = 0;
2237
2238         schedule_delayed_work(&osdc->osds_timeout_work,
2239            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2240
2241         err = -ENOMEM;
2242         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2243                                         sizeof(struct ceph_osd_request));
2244         if (!osdc->req_mempool)
2245                 goto out;
2246
2247         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2248                                 OSD_OP_FRONT_LEN, 10, true,
2249                                 "osd_op");
2250         if (err < 0)
2251                 goto out_mempool;
2252         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2253                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2254                                 "osd_op_reply");
2255         if (err < 0)
2256                 goto out_msgpool;
2257
2258         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2259         if (IS_ERR(osdc->notify_wq)) {
2260                 err = PTR_ERR(osdc->notify_wq);
2261                 osdc->notify_wq = NULL;
2262                 goto out_msgpool;
2263         }
2264         return 0;
2265
2266 out_msgpool:
2267         ceph_msgpool_destroy(&osdc->msgpool_op);
2268 out_mempool:
2269         mempool_destroy(osdc->req_mempool);
2270 out:
2271         return err;
2272 }
2273
2274 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2275 {
2276         flush_workqueue(osdc->notify_wq);
2277         destroy_workqueue(osdc->notify_wq);
2278         cancel_delayed_work_sync(&osdc->timeout_work);
2279         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2280         if (osdc->osdmap) {
2281                 ceph_osdmap_destroy(osdc->osdmap);
2282                 osdc->osdmap = NULL;
2283         }
2284         remove_all_osds(osdc);
2285         mempool_destroy(osdc->req_mempool);
2286         ceph_msgpool_destroy(&osdc->msgpool_op);
2287         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2288 }
2289
2290 /*
2291  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2292  * *plen.  Return number of bytes read, or error.
2293  */
2294 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2295                         struct ceph_vino vino, struct ceph_file_layout *layout,
2296                         u64 off, u64 *plen,
2297                         u32 truncate_seq, u64 truncate_size,
2298                         struct page **pages, int num_pages, int page_align)
2299 {
2300         struct ceph_osd_request *req;
2301         int rc = 0;
2302
2303         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2304              vino.snap, off, *plen);
2305         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2306                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2307                                     NULL, truncate_seq, truncate_size,
2308                                     false);
2309         if (IS_ERR(req))
2310                 return PTR_ERR(req);
2311
2312         /* it may be a short read due to an object boundary */
2313
2314         osd_req_op_extent_osd_data_pages(req, 0,
2315                                 pages, *plen, page_align, false, false);
2316
2317         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2318              off, *plen, *plen, page_align);
2319
2320         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2321
2322         rc = ceph_osdc_start_request(osdc, req, false);
2323         if (!rc)
2324                 rc = ceph_osdc_wait_request(osdc, req);
2325
2326         ceph_osdc_put_request(req);
2327         dout("readpages result %d\n", rc);
2328         return rc;
2329 }
2330 EXPORT_SYMBOL(ceph_osdc_readpages);
2331
2332 /*
2333  * do a synchronous write on N pages
2334  */
2335 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2336                          struct ceph_file_layout *layout,
2337                          struct ceph_snap_context *snapc,
2338                          u64 off, u64 len,
2339                          u32 truncate_seq, u64 truncate_size,
2340                          struct timespec *mtime,
2341                          struct page **pages, int num_pages)
2342 {
2343         struct ceph_osd_request *req;
2344         int rc = 0;
2345         int page_align = off & ~PAGE_MASK;
2346
2347         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2348         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2349                                     CEPH_OSD_OP_WRITE,
2350                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2351                                     snapc, truncate_seq, truncate_size,
2352                                     true);
2353         if (IS_ERR(req))
2354                 return PTR_ERR(req);
2355
2356         /* it may be a short write due to an object boundary */
2357         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2358                                 false, false);
2359         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2360
2361         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2362
2363         rc = ceph_osdc_start_request(osdc, req, true);
2364         if (!rc)
2365                 rc = ceph_osdc_wait_request(osdc, req);
2366
2367         ceph_osdc_put_request(req);
2368         if (rc == 0)
2369                 rc = len;
2370         dout("writepages result %d\n", rc);
2371         return rc;
2372 }
2373 EXPORT_SYMBOL(ceph_osdc_writepages);
2374
2375 int ceph_osdc_setup(void)
2376 {
2377         BUG_ON(ceph_osd_request_cache);
2378         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2379                                         sizeof (struct ceph_osd_request),
2380                                         __alignof__(struct ceph_osd_request),
2381                                         0, NULL);
2382
2383         return ceph_osd_request_cache ? 0 : -ENOMEM;
2384 }
2385 EXPORT_SYMBOL(ceph_osdc_setup);
2386
2387 void ceph_osdc_cleanup(void)
2388 {
2389         BUG_ON(!ceph_osd_request_cache);
2390         kmem_cache_destroy(ceph_osd_request_cache);
2391         ceph_osd_request_cache = NULL;
2392 }
2393 EXPORT_SYMBOL(ceph_osdc_cleanup);
2394
2395 /*
2396  * handle incoming message
2397  */
2398 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2399 {
2400         struct ceph_osd *osd = con->private;
2401         struct ceph_osd_client *osdc;
2402         int type = le16_to_cpu(msg->hdr.type);
2403
2404         if (!osd)
2405                 goto out;
2406         osdc = osd->o_osdc;
2407
2408         switch (type) {
2409         case CEPH_MSG_OSD_MAP:
2410                 ceph_osdc_handle_map(osdc, msg);
2411                 break;
2412         case CEPH_MSG_OSD_OPREPLY:
2413                 handle_reply(osdc, msg, con);
2414                 break;
2415         case CEPH_MSG_WATCH_NOTIFY:
2416                 handle_watch_notify(osdc, msg);
2417                 break;
2418
2419         default:
2420                 pr_err("received unknown message type %d %s\n", type,
2421                        ceph_msg_type_name(type));
2422         }
2423 out:
2424         ceph_msg_put(msg);
2425 }
2426
2427 /*
2428  * lookup and return message for incoming reply.  set up reply message
2429  * pages.
2430  */
2431 static struct ceph_msg *get_reply(struct ceph_connection *con,
2432                                   struct ceph_msg_header *hdr,
2433                                   int *skip)
2434 {
2435         struct ceph_osd *osd = con->private;
2436         struct ceph_osd_client *osdc = osd->o_osdc;
2437         struct ceph_msg *m;
2438         struct ceph_osd_request *req;
2439         int front = le32_to_cpu(hdr->front_len);
2440         int data_len = le32_to_cpu(hdr->data_len);
2441         u64 tid;
2442
2443         tid = le64_to_cpu(hdr->tid);
2444         mutex_lock(&osdc->request_mutex);
2445         req = __lookup_request(osdc, tid);
2446         if (!req) {
2447                 *skip = 1;
2448                 m = NULL;
2449                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2450                      osd->o_osd);
2451                 goto out;
2452         }
2453
2454         if (req->r_reply->con)
2455                 dout("%s revoking msg %p from old con %p\n", __func__,
2456                      req->r_reply, req->r_reply->con);
2457         ceph_msg_revoke_incoming(req->r_reply);
2458
2459         if (front > req->r_reply->front.iov_len) {
2460                 pr_warning("get_reply front %d > preallocated %d\n",
2461                            front, (int)req->r_reply->front.iov_len);
2462                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2463                 if (!m)
2464                         goto out;
2465                 ceph_msg_put(req->r_reply);
2466                 req->r_reply = m;
2467         }
2468         m = ceph_msg_get(req->r_reply);
2469
2470         if (data_len > 0) {
2471                 struct ceph_osd_data *osd_data;
2472
2473                 /*
2474                  * XXX This is assuming there is only one op containing
2475                  * XXX page data.  Probably OK for reads, but this
2476                  * XXX ought to be done more generally.
2477                  */
2478                 osd_data = osd_req_op_extent_osd_data(req, 0);
2479                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2480                         if (osd_data->pages &&
2481                                 unlikely(osd_data->length < data_len)) {
2482
2483                                 pr_warning("tid %lld reply has %d bytes "
2484                                         "we had only %llu bytes ready\n",
2485                                         tid, data_len, osd_data->length);
2486                                 *skip = 1;
2487                                 ceph_msg_put(m);
2488                                 m = NULL;
2489                                 goto out;
2490                         }
2491                 }
2492         }
2493         *skip = 0;
2494         dout("get_reply tid %lld %p\n", tid, m);
2495
2496 out:
2497         mutex_unlock(&osdc->request_mutex);
2498         return m;
2499
2500 }
2501
2502 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2503                                   struct ceph_msg_header *hdr,
2504                                   int *skip)
2505 {
2506         struct ceph_osd *osd = con->private;
2507         int type = le16_to_cpu(hdr->type);
2508         int front = le32_to_cpu(hdr->front_len);
2509
2510         *skip = 0;
2511         switch (type) {
2512         case CEPH_MSG_OSD_MAP:
2513         case CEPH_MSG_WATCH_NOTIFY:
2514                 return ceph_msg_new(type, front, GFP_NOFS, false);
2515         case CEPH_MSG_OSD_OPREPLY:
2516                 return get_reply(con, hdr, skip);
2517         default:
2518                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2519                         osd->o_osd);
2520                 *skip = 1;
2521                 return NULL;
2522         }
2523 }
2524
2525 /*
2526  * Wrappers to refcount containing ceph_osd struct
2527  */
2528 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2529 {
2530         struct ceph_osd *osd = con->private;
2531         if (get_osd(osd))
2532                 return con;
2533         return NULL;
2534 }
2535
2536 static void put_osd_con(struct ceph_connection *con)
2537 {
2538         struct ceph_osd *osd = con->private;
2539         put_osd(osd);
2540 }
2541
2542 /*
2543  * authentication
2544  */
2545 /*
2546  * Note: returned pointer is the address of a structure that's
2547  * managed separately.  Caller must *not* attempt to free it.
2548  */
2549 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2550                                         int *proto, int force_new)
2551 {
2552         struct ceph_osd *o = con->private;
2553         struct ceph_osd_client *osdc = o->o_osdc;
2554         struct ceph_auth_client *ac = osdc->client->monc.auth;
2555         struct ceph_auth_handshake *auth = &o->o_auth;
2556
2557         if (force_new && auth->authorizer) {
2558                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2559                 auth->authorizer = NULL;
2560         }
2561         if (!auth->authorizer) {
2562                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2563                                                       auth);
2564                 if (ret)
2565                         return ERR_PTR(ret);
2566         } else {
2567                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2568                                                      auth);
2569                 if (ret)
2570                         return ERR_PTR(ret);
2571         }
2572         *proto = ac->protocol;
2573
2574         return auth;
2575 }
2576
2577
2578 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2579 {
2580         struct ceph_osd *o = con->private;
2581         struct ceph_osd_client *osdc = o->o_osdc;
2582         struct ceph_auth_client *ac = osdc->client->monc.auth;
2583
2584         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2585 }
2586
2587 static int invalidate_authorizer(struct ceph_connection *con)
2588 {
2589         struct ceph_osd *o = con->private;
2590         struct ceph_osd_client *osdc = o->o_osdc;
2591         struct ceph_auth_client *ac = osdc->client->monc.auth;
2592
2593         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2594         return ceph_monc_validate_auth(&osdc->client->monc);
2595 }
2596
2597 static const struct ceph_connection_operations osd_con_ops = {
2598         .get = get_osd_con,
2599         .put = put_osd_con,
2600         .dispatch = dispatch,
2601         .get_authorizer = get_authorizer,
2602         .verify_authorizer_reply = verify_authorizer_reply,
2603         .invalidate_authorizer = invalidate_authorizer,
2604         .alloc_msg = alloc_msg,
2605         .fault = osd_reset,
2606 };