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[~andy/linux] / 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                opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
508                opcode != CEPH_OSD_OP_TRUNCATE);
509
510         op->extent.offset = offset;
511         op->extent.length = length;
512         op->extent.truncate_size = truncate_size;
513         op->extent.truncate_seq = truncate_seq;
514         if (opcode == CEPH_OSD_OP_WRITE)
515                 payload_len += length;
516
517         op->payload_len = payload_len;
518 }
519 EXPORT_SYMBOL(osd_req_op_extent_init);
520
521 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
522                                 unsigned int which, u64 length)
523 {
524         struct ceph_osd_req_op *op;
525         u64 previous;
526
527         BUG_ON(which >= osd_req->r_num_ops);
528         op = &osd_req->r_ops[which];
529         previous = op->extent.length;
530
531         if (length == previous)
532                 return;         /* Nothing to do */
533         BUG_ON(length > previous);
534
535         op->extent.length = length;
536         op->payload_len -= previous - length;
537 }
538 EXPORT_SYMBOL(osd_req_op_extent_update);
539
540 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
541                         u16 opcode, const char *class, const char *method)
542 {
543         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
544         struct ceph_pagelist *pagelist;
545         size_t payload_len = 0;
546         size_t size;
547
548         BUG_ON(opcode != CEPH_OSD_OP_CALL);
549
550         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
551         BUG_ON(!pagelist);
552         ceph_pagelist_init(pagelist);
553
554         op->cls.class_name = class;
555         size = strlen(class);
556         BUG_ON(size > (size_t) U8_MAX);
557         op->cls.class_len = size;
558         ceph_pagelist_append(pagelist, class, size);
559         payload_len += size;
560
561         op->cls.method_name = method;
562         size = strlen(method);
563         BUG_ON(size > (size_t) U8_MAX);
564         op->cls.method_len = size;
565         ceph_pagelist_append(pagelist, method, size);
566         payload_len += size;
567
568         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
569
570         op->cls.argc = 0;       /* currently unused */
571
572         op->payload_len = payload_len;
573 }
574 EXPORT_SYMBOL(osd_req_op_cls_init);
575
576 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
577                                 unsigned int which, u16 opcode,
578                                 u64 cookie, u64 version, int flag)
579 {
580         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
581
582         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
583
584         op->watch.cookie = cookie;
585         op->watch.ver = version;
586         if (opcode == CEPH_OSD_OP_WATCH && flag)
587                 op->watch.flag = (u8)1;
588 }
589 EXPORT_SYMBOL(osd_req_op_watch_init);
590
591 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
592                                 struct ceph_osd_data *osd_data)
593 {
594         u64 length = ceph_osd_data_length(osd_data);
595
596         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
597                 BUG_ON(length > (u64) SIZE_MAX);
598                 if (length)
599                         ceph_msg_data_add_pages(msg, osd_data->pages,
600                                         length, osd_data->alignment);
601         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
602                 BUG_ON(!length);
603                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
604 #ifdef CONFIG_BLOCK
605         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
606                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
607 #endif
608         } else {
609                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
610         }
611 }
612
613 static u64 osd_req_encode_op(struct ceph_osd_request *req,
614                               struct ceph_osd_op *dst, unsigned int which)
615 {
616         struct ceph_osd_req_op *src;
617         struct ceph_osd_data *osd_data;
618         u64 request_data_len = 0;
619         u64 data_length;
620
621         BUG_ON(which >= req->r_num_ops);
622         src = &req->r_ops[which];
623         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
624                 pr_err("unrecognized osd opcode %d\n", src->op);
625
626                 return 0;
627         }
628
629         switch (src->op) {
630         case CEPH_OSD_OP_STAT:
631                 osd_data = &src->raw_data_in;
632                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
633                 break;
634         case CEPH_OSD_OP_READ:
635         case CEPH_OSD_OP_WRITE:
636         case CEPH_OSD_OP_ZERO:
637         case CEPH_OSD_OP_DELETE:
638         case CEPH_OSD_OP_TRUNCATE:
639                 if (src->op == CEPH_OSD_OP_WRITE)
640                         request_data_len = src->extent.length;
641                 dst->extent.offset = cpu_to_le64(src->extent.offset);
642                 dst->extent.length = cpu_to_le64(src->extent.length);
643                 dst->extent.truncate_size =
644                         cpu_to_le64(src->extent.truncate_size);
645                 dst->extent.truncate_seq =
646                         cpu_to_le32(src->extent.truncate_seq);
647                 osd_data = &src->extent.osd_data;
648                 if (src->op == CEPH_OSD_OP_WRITE)
649                         ceph_osdc_msg_data_add(req->r_request, osd_data);
650                 else
651                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
652                 break;
653         case CEPH_OSD_OP_CALL:
654                 dst->cls.class_len = src->cls.class_len;
655                 dst->cls.method_len = src->cls.method_len;
656                 osd_data = &src->cls.request_info;
657                 ceph_osdc_msg_data_add(req->r_request, osd_data);
658                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
659                 request_data_len = osd_data->pagelist->length;
660
661                 osd_data = &src->cls.request_data;
662                 data_length = ceph_osd_data_length(osd_data);
663                 if (data_length) {
664                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
665                         dst->cls.indata_len = cpu_to_le32(data_length);
666                         ceph_osdc_msg_data_add(req->r_request, osd_data);
667                         src->payload_len += data_length;
668                         request_data_len += data_length;
669                 }
670                 osd_data = &src->cls.response_data;
671                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
672                 break;
673         case CEPH_OSD_OP_STARTSYNC:
674                 break;
675         case CEPH_OSD_OP_NOTIFY_ACK:
676         case CEPH_OSD_OP_WATCH:
677                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
678                 dst->watch.ver = cpu_to_le64(src->watch.ver);
679                 dst->watch.flag = src->watch.flag;
680                 break;
681         default:
682                 pr_err("unsupported osd opcode %s\n",
683                         ceph_osd_op_name(src->op));
684                 WARN_ON(1);
685
686                 return 0;
687         }
688         dst->op = cpu_to_le16(src->op);
689         dst->payload_len = cpu_to_le32(src->payload_len);
690
691         return request_data_len;
692 }
693
694 /*
695  * build new request AND message, calculate layout, and adjust file
696  * extent as needed.
697  *
698  * if the file was recently truncated, we include information about its
699  * old and new size so that the object can be updated appropriately.  (we
700  * avoid synchronously deleting truncated objects because it's slow.)
701  *
702  * if @do_sync, include a 'startsync' command so that the osd will flush
703  * data quickly.
704  */
705 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
706                                                struct ceph_file_layout *layout,
707                                                struct ceph_vino vino,
708                                                u64 off, u64 *plen, int num_ops,
709                                                int opcode, int flags,
710                                                struct ceph_snap_context *snapc,
711                                                u32 truncate_seq,
712                                                u64 truncate_size,
713                                                bool use_mempool)
714 {
715         struct ceph_osd_request *req;
716         u64 objnum = 0;
717         u64 objoff = 0;
718         u64 objlen = 0;
719         u32 object_size;
720         u64 object_base;
721         int r;
722
723         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
724                opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
725                opcode != CEPH_OSD_OP_TRUNCATE);
726
727         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
728                                         GFP_NOFS);
729         if (!req)
730                 return ERR_PTR(-ENOMEM);
731
732         req->r_flags = flags;
733
734         /* calculate max write size */
735         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
736         if (r < 0) {
737                 ceph_osdc_put_request(req);
738                 return ERR_PTR(r);
739         }
740
741         object_size = le32_to_cpu(layout->fl_object_size);
742         object_base = off - objoff;
743         if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
744                 if (truncate_size <= object_base) {
745                         truncate_size = 0;
746                 } else {
747                         truncate_size -= object_base;
748                         if (truncate_size > object_size)
749                                 truncate_size = object_size;
750                 }
751         }
752
753         osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
754                                 truncate_size, truncate_seq);
755
756         /*
757          * A second op in the ops array means the caller wants to
758          * also issue a include a 'startsync' command so that the
759          * osd will flush data quickly.
760          */
761         if (num_ops > 1)
762                 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
763
764         req->r_file_layout = *layout;  /* keep a copy */
765
766         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
767                 vino.ino, objnum);
768         req->r_oid_len = strlen(req->r_oid);
769
770         return req;
771 }
772 EXPORT_SYMBOL(ceph_osdc_new_request);
773
774 /*
775  * We keep osd requests in an rbtree, sorted by ->r_tid.
776  */
777 static void __insert_request(struct ceph_osd_client *osdc,
778                              struct ceph_osd_request *new)
779 {
780         struct rb_node **p = &osdc->requests.rb_node;
781         struct rb_node *parent = NULL;
782         struct ceph_osd_request *req = NULL;
783
784         while (*p) {
785                 parent = *p;
786                 req = rb_entry(parent, struct ceph_osd_request, r_node);
787                 if (new->r_tid < req->r_tid)
788                         p = &(*p)->rb_left;
789                 else if (new->r_tid > req->r_tid)
790                         p = &(*p)->rb_right;
791                 else
792                         BUG();
793         }
794
795         rb_link_node(&new->r_node, parent, p);
796         rb_insert_color(&new->r_node, &osdc->requests);
797 }
798
799 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
800                                                  u64 tid)
801 {
802         struct ceph_osd_request *req;
803         struct rb_node *n = osdc->requests.rb_node;
804
805         while (n) {
806                 req = rb_entry(n, struct ceph_osd_request, r_node);
807                 if (tid < req->r_tid)
808                         n = n->rb_left;
809                 else if (tid > req->r_tid)
810                         n = n->rb_right;
811                 else
812                         return req;
813         }
814         return NULL;
815 }
816
817 static struct ceph_osd_request *
818 __lookup_request_ge(struct ceph_osd_client *osdc,
819                     u64 tid)
820 {
821         struct ceph_osd_request *req;
822         struct rb_node *n = osdc->requests.rb_node;
823
824         while (n) {
825                 req = rb_entry(n, struct ceph_osd_request, r_node);
826                 if (tid < req->r_tid) {
827                         if (!n->rb_left)
828                                 return req;
829                         n = n->rb_left;
830                 } else if (tid > req->r_tid) {
831                         n = n->rb_right;
832                 } else {
833                         return req;
834                 }
835         }
836         return NULL;
837 }
838
839 /*
840  * Resubmit requests pending on the given osd.
841  */
842 static void __kick_osd_requests(struct ceph_osd_client *osdc,
843                                 struct ceph_osd *osd)
844 {
845         struct ceph_osd_request *req, *nreq;
846         LIST_HEAD(resend);
847         int err;
848
849         dout("__kick_osd_requests osd%d\n", osd->o_osd);
850         err = __reset_osd(osdc, osd);
851         if (err)
852                 return;
853         /*
854          * Build up a list of requests to resend by traversing the
855          * osd's list of requests.  Requests for a given object are
856          * sent in tid order, and that is also the order they're
857          * kept on this list.  Therefore all requests that are in
858          * flight will be found first, followed by all requests that
859          * have not yet been sent.  And to resend requests while
860          * preserving this order we will want to put any sent
861          * requests back on the front of the osd client's unsent
862          * list.
863          *
864          * So we build a separate ordered list of already-sent
865          * requests for the affected osd and splice it onto the
866          * front of the osd client's unsent list.  Once we've seen a
867          * request that has not yet been sent we're done.  Those
868          * requests are already sitting right where they belong.
869          */
870         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
871                 if (!req->r_sent)
872                         break;
873                 list_move_tail(&req->r_req_lru_item, &resend);
874                 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
875                      osd->o_osd);
876                 if (!req->r_linger)
877                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
878         }
879         list_splice(&resend, &osdc->req_unsent);
880
881         /*
882          * Linger requests are re-registered before sending, which
883          * sets up a new tid for each.  We add them to the unsent
884          * list at the end to keep things in tid order.
885          */
886         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
887                                  r_linger_osd) {
888                 /*
889                  * reregister request prior to unregistering linger so
890                  * that r_osd is preserved.
891                  */
892                 BUG_ON(!list_empty(&req->r_req_lru_item));
893                 __register_request(osdc, req);
894                 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
895                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
896                 __unregister_linger_request(osdc, req);
897                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
898                      osd->o_osd);
899         }
900 }
901
902 /*
903  * If the osd connection drops, we need to resubmit all requests.
904  */
905 static void osd_reset(struct ceph_connection *con)
906 {
907         struct ceph_osd *osd = con->private;
908         struct ceph_osd_client *osdc;
909
910         if (!osd)
911                 return;
912         dout("osd_reset osd%d\n", osd->o_osd);
913         osdc = osd->o_osdc;
914         down_read(&osdc->map_sem);
915         mutex_lock(&osdc->request_mutex);
916         __kick_osd_requests(osdc, osd);
917         __send_queued(osdc);
918         mutex_unlock(&osdc->request_mutex);
919         up_read(&osdc->map_sem);
920 }
921
922 /*
923  * Track open sessions with osds.
924  */
925 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
926 {
927         struct ceph_osd *osd;
928
929         osd = kzalloc(sizeof(*osd), GFP_NOFS);
930         if (!osd)
931                 return NULL;
932
933         atomic_set(&osd->o_ref, 1);
934         osd->o_osdc = osdc;
935         osd->o_osd = onum;
936         RB_CLEAR_NODE(&osd->o_node);
937         INIT_LIST_HEAD(&osd->o_requests);
938         INIT_LIST_HEAD(&osd->o_linger_requests);
939         INIT_LIST_HEAD(&osd->o_osd_lru);
940         osd->o_incarnation = 1;
941
942         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
943
944         INIT_LIST_HEAD(&osd->o_keepalive_item);
945         return osd;
946 }
947
948 static struct ceph_osd *get_osd(struct ceph_osd *osd)
949 {
950         if (atomic_inc_not_zero(&osd->o_ref)) {
951                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
952                      atomic_read(&osd->o_ref));
953                 return osd;
954         } else {
955                 dout("get_osd %p FAIL\n", osd);
956                 return NULL;
957         }
958 }
959
960 static void put_osd(struct ceph_osd *osd)
961 {
962         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
963              atomic_read(&osd->o_ref) - 1);
964         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
965                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
966
967                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
968                 kfree(osd);
969         }
970 }
971
972 /*
973  * remove an osd from our map
974  */
975 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
976 {
977         dout("__remove_osd %p\n", osd);
978         BUG_ON(!list_empty(&osd->o_requests));
979         rb_erase(&osd->o_node, &osdc->osds);
980         list_del_init(&osd->o_osd_lru);
981         ceph_con_close(&osd->o_con);
982         put_osd(osd);
983 }
984
985 static void remove_all_osds(struct ceph_osd_client *osdc)
986 {
987         dout("%s %p\n", __func__, osdc);
988         mutex_lock(&osdc->request_mutex);
989         while (!RB_EMPTY_ROOT(&osdc->osds)) {
990                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
991                                                 struct ceph_osd, o_node);
992                 __remove_osd(osdc, osd);
993         }
994         mutex_unlock(&osdc->request_mutex);
995 }
996
997 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
998                               struct ceph_osd *osd)
999 {
1000         dout("__move_osd_to_lru %p\n", osd);
1001         BUG_ON(!list_empty(&osd->o_osd_lru));
1002         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1003         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1004 }
1005
1006 static void __remove_osd_from_lru(struct ceph_osd *osd)
1007 {
1008         dout("__remove_osd_from_lru %p\n", osd);
1009         if (!list_empty(&osd->o_osd_lru))
1010                 list_del_init(&osd->o_osd_lru);
1011 }
1012
1013 static void remove_old_osds(struct ceph_osd_client *osdc)
1014 {
1015         struct ceph_osd *osd, *nosd;
1016
1017         dout("__remove_old_osds %p\n", osdc);
1018         mutex_lock(&osdc->request_mutex);
1019         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1020                 if (time_before(jiffies, osd->lru_ttl))
1021                         break;
1022                 __remove_osd(osdc, osd);
1023         }
1024         mutex_unlock(&osdc->request_mutex);
1025 }
1026
1027 /*
1028  * reset osd connect
1029  */
1030 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1031 {
1032         struct ceph_entity_addr *peer_addr;
1033
1034         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1035         if (list_empty(&osd->o_requests) &&
1036             list_empty(&osd->o_linger_requests)) {
1037                 __remove_osd(osdc, osd);
1038
1039                 return -ENODEV;
1040         }
1041
1042         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1043         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1044                         !ceph_con_opened(&osd->o_con)) {
1045                 struct ceph_osd_request *req;
1046
1047                 dout(" osd addr hasn't changed and connection never opened,"
1048                      " letting msgr retry");
1049                 /* touch each r_stamp for handle_timeout()'s benfit */
1050                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1051                         req->r_stamp = jiffies;
1052
1053                 return -EAGAIN;
1054         }
1055
1056         ceph_con_close(&osd->o_con);
1057         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1058         osd->o_incarnation++;
1059
1060         return 0;
1061 }
1062
1063 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1064 {
1065         struct rb_node **p = &osdc->osds.rb_node;
1066         struct rb_node *parent = NULL;
1067         struct ceph_osd *osd = NULL;
1068
1069         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1070         while (*p) {
1071                 parent = *p;
1072                 osd = rb_entry(parent, struct ceph_osd, o_node);
1073                 if (new->o_osd < osd->o_osd)
1074                         p = &(*p)->rb_left;
1075                 else if (new->o_osd > osd->o_osd)
1076                         p = &(*p)->rb_right;
1077                 else
1078                         BUG();
1079         }
1080
1081         rb_link_node(&new->o_node, parent, p);
1082         rb_insert_color(&new->o_node, &osdc->osds);
1083 }
1084
1085 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1086 {
1087         struct ceph_osd *osd;
1088         struct rb_node *n = osdc->osds.rb_node;
1089
1090         while (n) {
1091                 osd = rb_entry(n, struct ceph_osd, o_node);
1092                 if (o < osd->o_osd)
1093                         n = n->rb_left;
1094                 else if (o > osd->o_osd)
1095                         n = n->rb_right;
1096                 else
1097                         return osd;
1098         }
1099         return NULL;
1100 }
1101
1102 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1103 {
1104         schedule_delayed_work(&osdc->timeout_work,
1105                         osdc->client->options->osd_keepalive_timeout * HZ);
1106 }
1107
1108 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1109 {
1110         cancel_delayed_work(&osdc->timeout_work);
1111 }
1112
1113 /*
1114  * Register request, assign tid.  If this is the first request, set up
1115  * the timeout event.
1116  */
1117 static void __register_request(struct ceph_osd_client *osdc,
1118                                struct ceph_osd_request *req)
1119 {
1120         req->r_tid = ++osdc->last_tid;
1121         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1122         dout("__register_request %p tid %lld\n", req, req->r_tid);
1123         __insert_request(osdc, req);
1124         ceph_osdc_get_request(req);
1125         osdc->num_requests++;
1126         if (osdc->num_requests == 1) {
1127                 dout(" first request, scheduling timeout\n");
1128                 __schedule_osd_timeout(osdc);
1129         }
1130 }
1131
1132 /*
1133  * called under osdc->request_mutex
1134  */
1135 static void __unregister_request(struct ceph_osd_client *osdc,
1136                                  struct ceph_osd_request *req)
1137 {
1138         if (RB_EMPTY_NODE(&req->r_node)) {
1139                 dout("__unregister_request %p tid %lld not registered\n",
1140                         req, req->r_tid);
1141                 return;
1142         }
1143
1144         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1145         rb_erase(&req->r_node, &osdc->requests);
1146         osdc->num_requests--;
1147
1148         if (req->r_osd) {
1149                 /* make sure the original request isn't in flight. */
1150                 ceph_msg_revoke(req->r_request);
1151
1152                 list_del_init(&req->r_osd_item);
1153                 if (list_empty(&req->r_osd->o_requests) &&
1154                     list_empty(&req->r_osd->o_linger_requests)) {
1155                         dout("moving osd to %p lru\n", req->r_osd);
1156                         __move_osd_to_lru(osdc, req->r_osd);
1157                 }
1158                 if (list_empty(&req->r_linger_item))
1159                         req->r_osd = NULL;
1160         }
1161
1162         list_del_init(&req->r_req_lru_item);
1163         ceph_osdc_put_request(req);
1164
1165         if (osdc->num_requests == 0) {
1166                 dout(" no requests, canceling timeout\n");
1167                 __cancel_osd_timeout(osdc);
1168         }
1169 }
1170
1171 /*
1172  * Cancel a previously queued request message
1173  */
1174 static void __cancel_request(struct ceph_osd_request *req)
1175 {
1176         if (req->r_sent && req->r_osd) {
1177                 ceph_msg_revoke(req->r_request);
1178                 req->r_sent = 0;
1179         }
1180 }
1181
1182 static void __register_linger_request(struct ceph_osd_client *osdc,
1183                                     struct ceph_osd_request *req)
1184 {
1185         dout("__register_linger_request %p\n", req);
1186         ceph_osdc_get_request(req);
1187         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1188         if (req->r_osd)
1189                 list_add_tail(&req->r_linger_osd,
1190                               &req->r_osd->o_linger_requests);
1191 }
1192
1193 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1194                                         struct ceph_osd_request *req)
1195 {
1196         dout("__unregister_linger_request %p\n", req);
1197         list_del_init(&req->r_linger_item);
1198         if (req->r_osd) {
1199                 list_del_init(&req->r_linger_osd);
1200
1201                 if (list_empty(&req->r_osd->o_requests) &&
1202                     list_empty(&req->r_osd->o_linger_requests)) {
1203                         dout("moving osd to %p lru\n", req->r_osd);
1204                         __move_osd_to_lru(osdc, req->r_osd);
1205                 }
1206                 if (list_empty(&req->r_osd_item))
1207                         req->r_osd = NULL;
1208         }
1209         ceph_osdc_put_request(req);
1210 }
1211
1212 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1213                                          struct ceph_osd_request *req)
1214 {
1215         mutex_lock(&osdc->request_mutex);
1216         if (req->r_linger) {
1217                 req->r_linger = 0;
1218                 __unregister_linger_request(osdc, req);
1219         }
1220         mutex_unlock(&osdc->request_mutex);
1221 }
1222 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1223
1224 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1225                                   struct ceph_osd_request *req)
1226 {
1227         if (!req->r_linger) {
1228                 dout("set_request_linger %p\n", req);
1229                 req->r_linger = 1;
1230         }
1231 }
1232 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1233
1234 /*
1235  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1236  * (as needed), and set the request r_osd appropriately.  If there is
1237  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1238  * (unsent, homeless) or leave on in-flight lru.
1239  *
1240  * Return 0 if unchanged, 1 if changed, or negative on error.
1241  *
1242  * Caller should hold map_sem for read and request_mutex.
1243  */
1244 static int __map_request(struct ceph_osd_client *osdc,
1245                          struct ceph_osd_request *req, int force_resend)
1246 {
1247         struct ceph_pg pgid;
1248         int acting[CEPH_PG_MAX_SIZE];
1249         int o = -1, num = 0;
1250         int err;
1251
1252         dout("map_request %p tid %lld\n", req, req->r_tid);
1253         err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
1254                                 ceph_file_layout_pg_pool(req->r_file_layout));
1255         if (err) {
1256                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1257                 return err;
1258         }
1259         req->r_pgid = pgid;
1260
1261         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1262         if (err > 0) {
1263                 o = acting[0];
1264                 num = err;
1265         }
1266
1267         if ((!force_resend &&
1268              req->r_osd && req->r_osd->o_osd == o &&
1269              req->r_sent >= req->r_osd->o_incarnation &&
1270              req->r_num_pg_osds == num &&
1271              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1272             (req->r_osd == NULL && o == -1))
1273                 return 0;  /* no change */
1274
1275         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1276              req->r_tid, pgid.pool, pgid.seed, o,
1277              req->r_osd ? req->r_osd->o_osd : -1);
1278
1279         /* record full pg acting set */
1280         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1281         req->r_num_pg_osds = num;
1282
1283         if (req->r_osd) {
1284                 __cancel_request(req);
1285                 list_del_init(&req->r_osd_item);
1286                 req->r_osd = NULL;
1287         }
1288
1289         req->r_osd = __lookup_osd(osdc, o);
1290         if (!req->r_osd && o >= 0) {
1291                 err = -ENOMEM;
1292                 req->r_osd = create_osd(osdc, o);
1293                 if (!req->r_osd) {
1294                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1295                         goto out;
1296                 }
1297
1298                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1299                 __insert_osd(osdc, req->r_osd);
1300
1301                 ceph_con_open(&req->r_osd->o_con,
1302                               CEPH_ENTITY_TYPE_OSD, o,
1303                               &osdc->osdmap->osd_addr[o]);
1304         }
1305
1306         if (req->r_osd) {
1307                 __remove_osd_from_lru(req->r_osd);
1308                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1309                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1310         } else {
1311                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1312         }
1313         err = 1;   /* osd or pg changed */
1314
1315 out:
1316         return err;
1317 }
1318
1319 /*
1320  * caller should hold map_sem (for read) and request_mutex
1321  */
1322 static void __send_request(struct ceph_osd_client *osdc,
1323                            struct ceph_osd_request *req)
1324 {
1325         void *p;
1326
1327         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1328              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1329              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1330
1331         /* fill in message content that changes each time we send it */
1332         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1333         put_unaligned_le32(req->r_flags, req->r_request_flags);
1334         put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
1335         p = req->r_request_pgid;
1336         ceph_encode_64(&p, req->r_pgid.pool);
1337         ceph_encode_32(&p, req->r_pgid.seed);
1338         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1339         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1340                sizeof(req->r_reassert_version));
1341
1342         req->r_stamp = jiffies;
1343         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1344
1345         ceph_msg_get(req->r_request); /* send consumes a ref */
1346
1347         req->r_sent = req->r_osd->o_incarnation;
1348
1349         ceph_con_send(&req->r_osd->o_con, req->r_request);
1350 }
1351
1352 /*
1353  * Send any requests in the queue (req_unsent).
1354  */
1355 static void __send_queued(struct ceph_osd_client *osdc)
1356 {
1357         struct ceph_osd_request *req, *tmp;
1358
1359         dout("__send_queued\n");
1360         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1361                 __send_request(osdc, req);
1362 }
1363
1364 /*
1365  * Timeout callback, called every N seconds when 1 or more osd
1366  * requests has been active for more than N seconds.  When this
1367  * happens, we ping all OSDs with requests who have timed out to
1368  * ensure any communications channel reset is detected.  Reset the
1369  * request timeouts another N seconds in the future as we go.
1370  * Reschedule the timeout event another N seconds in future (unless
1371  * there are no open requests).
1372  */
1373 static void handle_timeout(struct work_struct *work)
1374 {
1375         struct ceph_osd_client *osdc =
1376                 container_of(work, struct ceph_osd_client, timeout_work.work);
1377         struct ceph_osd_request *req;
1378         struct ceph_osd *osd;
1379         unsigned long keepalive =
1380                 osdc->client->options->osd_keepalive_timeout * HZ;
1381         struct list_head slow_osds;
1382         dout("timeout\n");
1383         down_read(&osdc->map_sem);
1384
1385         ceph_monc_request_next_osdmap(&osdc->client->monc);
1386
1387         mutex_lock(&osdc->request_mutex);
1388
1389         /*
1390          * ping osds that are a bit slow.  this ensures that if there
1391          * is a break in the TCP connection we will notice, and reopen
1392          * a connection with that osd (from the fault callback).
1393          */
1394         INIT_LIST_HEAD(&slow_osds);
1395         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1396                 if (time_before(jiffies, req->r_stamp + keepalive))
1397                         break;
1398
1399                 osd = req->r_osd;
1400                 BUG_ON(!osd);
1401                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1402                      req->r_tid, osd->o_osd);
1403                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1404         }
1405         while (!list_empty(&slow_osds)) {
1406                 osd = list_entry(slow_osds.next, struct ceph_osd,
1407                                  o_keepalive_item);
1408                 list_del_init(&osd->o_keepalive_item);
1409                 ceph_con_keepalive(&osd->o_con);
1410         }
1411
1412         __schedule_osd_timeout(osdc);
1413         __send_queued(osdc);
1414         mutex_unlock(&osdc->request_mutex);
1415         up_read(&osdc->map_sem);
1416 }
1417
1418 static void handle_osds_timeout(struct work_struct *work)
1419 {
1420         struct ceph_osd_client *osdc =
1421                 container_of(work, struct ceph_osd_client,
1422                              osds_timeout_work.work);
1423         unsigned long delay =
1424                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1425
1426         dout("osds timeout\n");
1427         down_read(&osdc->map_sem);
1428         remove_old_osds(osdc);
1429         up_read(&osdc->map_sem);
1430
1431         schedule_delayed_work(&osdc->osds_timeout_work,
1432                               round_jiffies_relative(delay));
1433 }
1434
1435 static void complete_request(struct ceph_osd_request *req)
1436 {
1437         complete_all(&req->r_safe_completion);  /* fsync waiter */
1438 }
1439
1440 /*
1441  * handle osd op reply.  either call the callback if it is specified,
1442  * or do the completion to wake up the waiting thread.
1443  */
1444 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1445                          struct ceph_connection *con)
1446 {
1447         void *p, *end;
1448         struct ceph_osd_request *req;
1449         u64 tid;
1450         int object_len;
1451         unsigned int numops;
1452         int payload_len, flags;
1453         s32 result;
1454         s32 retry_attempt;
1455         struct ceph_pg pg;
1456         int err;
1457         u32 reassert_epoch;
1458         u64 reassert_version;
1459         u32 osdmap_epoch;
1460         int already_completed;
1461         u32 bytes;
1462         unsigned int i;
1463
1464         tid = le64_to_cpu(msg->hdr.tid);
1465         dout("handle_reply %p tid %llu\n", msg, tid);
1466
1467         p = msg->front.iov_base;
1468         end = p + msg->front.iov_len;
1469
1470         ceph_decode_need(&p, end, 4, bad);
1471         object_len = ceph_decode_32(&p);
1472         ceph_decode_need(&p, end, object_len, bad);
1473         p += object_len;
1474
1475         err = ceph_decode_pgid(&p, end, &pg);
1476         if (err)
1477                 goto bad;
1478
1479         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1480         flags = ceph_decode_64(&p);
1481         result = ceph_decode_32(&p);
1482         reassert_epoch = ceph_decode_32(&p);
1483         reassert_version = ceph_decode_64(&p);
1484         osdmap_epoch = ceph_decode_32(&p);
1485
1486         /* lookup */
1487         mutex_lock(&osdc->request_mutex);
1488         req = __lookup_request(osdc, tid);
1489         if (req == NULL) {
1490                 dout("handle_reply tid %llu dne\n", tid);
1491                 goto bad_mutex;
1492         }
1493         ceph_osdc_get_request(req);
1494
1495         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1496              req, result);
1497
1498         ceph_decode_need(&p, end, 4, bad_put);
1499         numops = ceph_decode_32(&p);
1500         if (numops > CEPH_OSD_MAX_OP)
1501                 goto bad_put;
1502         if (numops != req->r_num_ops)
1503                 goto bad_put;
1504         payload_len = 0;
1505         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1506         for (i = 0; i < numops; i++) {
1507                 struct ceph_osd_op *op = p;
1508                 int len;
1509
1510                 len = le32_to_cpu(op->payload_len);
1511                 req->r_reply_op_len[i] = len;
1512                 dout(" op %d has %d bytes\n", i, len);
1513                 payload_len += len;
1514                 p += sizeof(*op);
1515         }
1516         bytes = le32_to_cpu(msg->hdr.data_len);
1517         if (payload_len != bytes) {
1518                 pr_warning("sum of op payload lens %d != data_len %d",
1519                            payload_len, bytes);
1520                 goto bad_put;
1521         }
1522
1523         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1524         retry_attempt = ceph_decode_32(&p);
1525         for (i = 0; i < numops; i++)
1526                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1527
1528         already_completed = req->r_got_reply;
1529
1530         if (!req->r_got_reply) {
1531
1532                 req->r_result = result;
1533                 dout("handle_reply result %d bytes %d\n", req->r_result,
1534                      bytes);
1535                 if (req->r_result == 0)
1536                         req->r_result = bytes;
1537
1538                 /* in case this is a write and we need to replay, */
1539                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1540                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1541
1542                 req->r_got_reply = 1;
1543         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1544                 dout("handle_reply tid %llu dup ack\n", tid);
1545                 mutex_unlock(&osdc->request_mutex);
1546                 goto done;
1547         }
1548
1549         dout("handle_reply tid %llu flags %d\n", tid, flags);
1550
1551         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1552                 __register_linger_request(osdc, req);
1553
1554         /* either this is a read, or we got the safe response */
1555         if (result < 0 ||
1556             (flags & CEPH_OSD_FLAG_ONDISK) ||
1557             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1558                 __unregister_request(osdc, req);
1559
1560         mutex_unlock(&osdc->request_mutex);
1561
1562         if (!already_completed) {
1563                 if (req->r_unsafe_callback &&
1564                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1565                         req->r_unsafe_callback(req, true);
1566                 if (req->r_callback)
1567                         req->r_callback(req, msg);
1568                 else
1569                         complete_all(&req->r_completion);
1570         }
1571
1572         if (flags & CEPH_OSD_FLAG_ONDISK) {
1573                 if (req->r_unsafe_callback && already_completed)
1574                         req->r_unsafe_callback(req, false);
1575                 complete_request(req);
1576         }
1577
1578 done:
1579         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1580         ceph_osdc_put_request(req);
1581         return;
1582
1583 bad_put:
1584         req->r_result = -EIO;
1585         __unregister_request(osdc, req);
1586         if (req->r_callback)
1587                 req->r_callback(req, msg);
1588         else
1589                 complete_all(&req->r_completion);
1590         complete_request(req);
1591         ceph_osdc_put_request(req);
1592 bad_mutex:
1593         mutex_unlock(&osdc->request_mutex);
1594 bad:
1595         pr_err("corrupt osd_op_reply got %d %d\n",
1596                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1597         ceph_msg_dump(msg);
1598 }
1599
1600 static void reset_changed_osds(struct ceph_osd_client *osdc)
1601 {
1602         struct rb_node *p, *n;
1603
1604         for (p = rb_first(&osdc->osds); p; p = n) {
1605                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1606
1607                 n = rb_next(p);
1608                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1609                     memcmp(&osd->o_con.peer_addr,
1610                            ceph_osd_addr(osdc->osdmap,
1611                                          osd->o_osd),
1612                            sizeof(struct ceph_entity_addr)) != 0)
1613                         __reset_osd(osdc, osd);
1614         }
1615 }
1616
1617 /*
1618  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1619  * no osd, request a new map.
1620  *
1621  * Caller should hold map_sem for read.
1622  */
1623 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1624 {
1625         struct ceph_osd_request *req, *nreq;
1626         struct rb_node *p;
1627         int needmap = 0;
1628         int err;
1629
1630         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1631         mutex_lock(&osdc->request_mutex);
1632         for (p = rb_first(&osdc->requests); p; ) {
1633                 req = rb_entry(p, struct ceph_osd_request, r_node);
1634                 p = rb_next(p);
1635
1636                 /*
1637                  * For linger requests that have not yet been
1638                  * registered, move them to the linger list; they'll
1639                  * be sent to the osd in the loop below.  Unregister
1640                  * the request before re-registering it as a linger
1641                  * request to ensure the __map_request() below
1642                  * will decide it needs to be sent.
1643                  */
1644                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1645                         dout("%p tid %llu restart on osd%d\n",
1646                              req, req->r_tid,
1647                              req->r_osd ? req->r_osd->o_osd : -1);
1648                         ceph_osdc_get_request(req);
1649                         __unregister_request(osdc, req);
1650                         __register_linger_request(osdc, req);
1651                         ceph_osdc_put_request(req);
1652                         continue;
1653                 }
1654
1655                 err = __map_request(osdc, req, force_resend);
1656                 if (err < 0)
1657                         continue;  /* error */
1658                 if (req->r_osd == NULL) {
1659                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1660                         needmap++;  /* request a newer map */
1661                 } else if (err > 0) {
1662                         if (!req->r_linger) {
1663                                 dout("%p tid %llu requeued on osd%d\n", req,
1664                                      req->r_tid,
1665                                      req->r_osd ? req->r_osd->o_osd : -1);
1666                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1667                         }
1668                 }
1669         }
1670
1671         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1672                                  r_linger_item) {
1673                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1674
1675                 err = __map_request(osdc, req, force_resend);
1676                 dout("__map_request returned %d\n", err);
1677                 if (err == 0)
1678                         continue;  /* no change and no osd was specified */
1679                 if (err < 0)
1680                         continue;  /* hrm! */
1681                 if (req->r_osd == NULL) {
1682                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1683                         needmap++;  /* request a newer map */
1684                         continue;
1685                 }
1686
1687                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1688                      req->r_osd ? req->r_osd->o_osd : -1);
1689                 __register_request(osdc, req);
1690                 __unregister_linger_request(osdc, req);
1691         }
1692         reset_changed_osds(osdc);
1693         mutex_unlock(&osdc->request_mutex);
1694
1695         if (needmap) {
1696                 dout("%d requests for down osds, need new map\n", needmap);
1697                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1698         }
1699 }
1700
1701
1702 /*
1703  * Process updated osd map.
1704  *
1705  * The message contains any number of incremental and full maps, normally
1706  * indicating some sort of topology change in the cluster.  Kick requests
1707  * off to different OSDs as needed.
1708  */
1709 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1710 {
1711         void *p, *end, *next;
1712         u32 nr_maps, maplen;
1713         u32 epoch;
1714         struct ceph_osdmap *newmap = NULL, *oldmap;
1715         int err;
1716         struct ceph_fsid fsid;
1717
1718         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1719         p = msg->front.iov_base;
1720         end = p + msg->front.iov_len;
1721
1722         /* verify fsid */
1723         ceph_decode_need(&p, end, sizeof(fsid), bad);
1724         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1725         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1726                 return;
1727
1728         down_write(&osdc->map_sem);
1729
1730         /* incremental maps */
1731         ceph_decode_32_safe(&p, end, nr_maps, bad);
1732         dout(" %d inc maps\n", nr_maps);
1733         while (nr_maps > 0) {
1734                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1735                 epoch = ceph_decode_32(&p);
1736                 maplen = ceph_decode_32(&p);
1737                 ceph_decode_need(&p, end, maplen, bad);
1738                 next = p + maplen;
1739                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1740                         dout("applying incremental map %u len %d\n",
1741                              epoch, maplen);
1742                         newmap = osdmap_apply_incremental(&p, next,
1743                                                           osdc->osdmap,
1744                                                           &osdc->client->msgr);
1745                         if (IS_ERR(newmap)) {
1746                                 err = PTR_ERR(newmap);
1747                                 goto bad;
1748                         }
1749                         BUG_ON(!newmap);
1750                         if (newmap != osdc->osdmap) {
1751                                 ceph_osdmap_destroy(osdc->osdmap);
1752                                 osdc->osdmap = newmap;
1753                         }
1754                         kick_requests(osdc, 0);
1755                 } else {
1756                         dout("ignoring incremental map %u len %d\n",
1757                              epoch, maplen);
1758                 }
1759                 p = next;
1760                 nr_maps--;
1761         }
1762         if (newmap)
1763                 goto done;
1764
1765         /* full maps */
1766         ceph_decode_32_safe(&p, end, nr_maps, bad);
1767         dout(" %d full maps\n", nr_maps);
1768         while (nr_maps) {
1769                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1770                 epoch = ceph_decode_32(&p);
1771                 maplen = ceph_decode_32(&p);
1772                 ceph_decode_need(&p, end, maplen, bad);
1773                 if (nr_maps > 1) {
1774                         dout("skipping non-latest full map %u len %d\n",
1775                              epoch, maplen);
1776                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1777                         dout("skipping full map %u len %d, "
1778                              "older than our %u\n", epoch, maplen,
1779                              osdc->osdmap->epoch);
1780                 } else {
1781                         int skipped_map = 0;
1782
1783                         dout("taking full map %u len %d\n", epoch, maplen);
1784                         newmap = osdmap_decode(&p, p+maplen);
1785                         if (IS_ERR(newmap)) {
1786                                 err = PTR_ERR(newmap);
1787                                 goto bad;
1788                         }
1789                         BUG_ON(!newmap);
1790                         oldmap = osdc->osdmap;
1791                         osdc->osdmap = newmap;
1792                         if (oldmap) {
1793                                 if (oldmap->epoch + 1 < newmap->epoch)
1794                                         skipped_map = 1;
1795                                 ceph_osdmap_destroy(oldmap);
1796                         }
1797                         kick_requests(osdc, skipped_map);
1798                 }
1799                 p += maplen;
1800                 nr_maps--;
1801         }
1802
1803         if (!osdc->osdmap)
1804                 goto bad;
1805 done:
1806         downgrade_write(&osdc->map_sem);
1807         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1808
1809         /*
1810          * subscribe to subsequent osdmap updates if full to ensure
1811          * we find out when we are no longer full and stop returning
1812          * ENOSPC.
1813          */
1814         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1815                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1816
1817         mutex_lock(&osdc->request_mutex);
1818         __send_queued(osdc);
1819         mutex_unlock(&osdc->request_mutex);
1820         up_read(&osdc->map_sem);
1821         wake_up_all(&osdc->client->auth_wq);
1822         return;
1823
1824 bad:
1825         pr_err("osdc handle_map corrupt msg\n");
1826         ceph_msg_dump(msg);
1827         up_write(&osdc->map_sem);
1828         return;
1829 }
1830
1831 /*
1832  * watch/notify callback event infrastructure
1833  *
1834  * These callbacks are used both for watch and notify operations.
1835  */
1836 static void __release_event(struct kref *kref)
1837 {
1838         struct ceph_osd_event *event =
1839                 container_of(kref, struct ceph_osd_event, kref);
1840
1841         dout("__release_event %p\n", event);
1842         kfree(event);
1843 }
1844
1845 static void get_event(struct ceph_osd_event *event)
1846 {
1847         kref_get(&event->kref);
1848 }
1849
1850 void ceph_osdc_put_event(struct ceph_osd_event *event)
1851 {
1852         kref_put(&event->kref, __release_event);
1853 }
1854 EXPORT_SYMBOL(ceph_osdc_put_event);
1855
1856 static void __insert_event(struct ceph_osd_client *osdc,
1857                              struct ceph_osd_event *new)
1858 {
1859         struct rb_node **p = &osdc->event_tree.rb_node;
1860         struct rb_node *parent = NULL;
1861         struct ceph_osd_event *event = NULL;
1862
1863         while (*p) {
1864                 parent = *p;
1865                 event = rb_entry(parent, struct ceph_osd_event, node);
1866                 if (new->cookie < event->cookie)
1867                         p = &(*p)->rb_left;
1868                 else if (new->cookie > event->cookie)
1869                         p = &(*p)->rb_right;
1870                 else
1871                         BUG();
1872         }
1873
1874         rb_link_node(&new->node, parent, p);
1875         rb_insert_color(&new->node, &osdc->event_tree);
1876 }
1877
1878 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1879                                                 u64 cookie)
1880 {
1881         struct rb_node **p = &osdc->event_tree.rb_node;
1882         struct rb_node *parent = NULL;
1883         struct ceph_osd_event *event = NULL;
1884
1885         while (*p) {
1886                 parent = *p;
1887                 event = rb_entry(parent, struct ceph_osd_event, node);
1888                 if (cookie < event->cookie)
1889                         p = &(*p)->rb_left;
1890                 else if (cookie > event->cookie)
1891                         p = &(*p)->rb_right;
1892                 else
1893                         return event;
1894         }
1895         return NULL;
1896 }
1897
1898 static void __remove_event(struct ceph_osd_event *event)
1899 {
1900         struct ceph_osd_client *osdc = event->osdc;
1901
1902         if (!RB_EMPTY_NODE(&event->node)) {
1903                 dout("__remove_event removed %p\n", event);
1904                 rb_erase(&event->node, &osdc->event_tree);
1905                 ceph_osdc_put_event(event);
1906         } else {
1907                 dout("__remove_event didn't remove %p\n", event);
1908         }
1909 }
1910
1911 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1912                            void (*event_cb)(u64, u64, u8, void *),
1913                            void *data, struct ceph_osd_event **pevent)
1914 {
1915         struct ceph_osd_event *event;
1916
1917         event = kmalloc(sizeof(*event), GFP_NOIO);
1918         if (!event)
1919                 return -ENOMEM;
1920
1921         dout("create_event %p\n", event);
1922         event->cb = event_cb;
1923         event->one_shot = 0;
1924         event->data = data;
1925         event->osdc = osdc;
1926         INIT_LIST_HEAD(&event->osd_node);
1927         RB_CLEAR_NODE(&event->node);
1928         kref_init(&event->kref);   /* one ref for us */
1929         kref_get(&event->kref);    /* one ref for the caller */
1930
1931         spin_lock(&osdc->event_lock);
1932         event->cookie = ++osdc->event_count;
1933         __insert_event(osdc, event);
1934         spin_unlock(&osdc->event_lock);
1935
1936         *pevent = event;
1937         return 0;
1938 }
1939 EXPORT_SYMBOL(ceph_osdc_create_event);
1940
1941 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1942 {
1943         struct ceph_osd_client *osdc = event->osdc;
1944
1945         dout("cancel_event %p\n", event);
1946         spin_lock(&osdc->event_lock);
1947         __remove_event(event);
1948         spin_unlock(&osdc->event_lock);
1949         ceph_osdc_put_event(event); /* caller's */
1950 }
1951 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1952
1953
1954 static void do_event_work(struct work_struct *work)
1955 {
1956         struct ceph_osd_event_work *event_work =
1957                 container_of(work, struct ceph_osd_event_work, work);
1958         struct ceph_osd_event *event = event_work->event;
1959         u64 ver = event_work->ver;
1960         u64 notify_id = event_work->notify_id;
1961         u8 opcode = event_work->opcode;
1962
1963         dout("do_event_work completing %p\n", event);
1964         event->cb(ver, notify_id, opcode, event->data);
1965         dout("do_event_work completed %p\n", event);
1966         ceph_osdc_put_event(event);
1967         kfree(event_work);
1968 }
1969
1970
1971 /*
1972  * Process osd watch notifications
1973  */
1974 static void handle_watch_notify(struct ceph_osd_client *osdc,
1975                                 struct ceph_msg *msg)
1976 {
1977         void *p, *end;
1978         u8 proto_ver;
1979         u64 cookie, ver, notify_id;
1980         u8 opcode;
1981         struct ceph_osd_event *event;
1982         struct ceph_osd_event_work *event_work;
1983
1984         p = msg->front.iov_base;
1985         end = p + msg->front.iov_len;
1986
1987         ceph_decode_8_safe(&p, end, proto_ver, bad);
1988         ceph_decode_8_safe(&p, end, opcode, bad);
1989         ceph_decode_64_safe(&p, end, cookie, bad);
1990         ceph_decode_64_safe(&p, end, ver, bad);
1991         ceph_decode_64_safe(&p, end, notify_id, bad);
1992
1993         spin_lock(&osdc->event_lock);
1994         event = __find_event(osdc, cookie);
1995         if (event) {
1996                 BUG_ON(event->one_shot);
1997                 get_event(event);
1998         }
1999         spin_unlock(&osdc->event_lock);
2000         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2001              cookie, ver, event);
2002         if (event) {
2003                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2004                 if (!event_work) {
2005                         dout("ERROR: could not allocate event_work\n");
2006                         goto done_err;
2007                 }
2008                 INIT_WORK(&event_work->work, do_event_work);
2009                 event_work->event = event;
2010                 event_work->ver = ver;
2011                 event_work->notify_id = notify_id;
2012                 event_work->opcode = opcode;
2013                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
2014                         dout("WARNING: failed to queue notify event work\n");
2015                         goto done_err;
2016                 }
2017         }
2018
2019         return;
2020
2021 done_err:
2022         ceph_osdc_put_event(event);
2023         return;
2024
2025 bad:
2026         pr_err("osdc handle_watch_notify corrupt msg\n");
2027         return;
2028 }
2029
2030 /*
2031  * build new request AND message
2032  *
2033  */
2034 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2035                                 struct ceph_snap_context *snapc, u64 snap_id,
2036                                 struct timespec *mtime)
2037 {
2038         struct ceph_msg *msg = req->r_request;
2039         void *p;
2040         size_t msg_size;
2041         int flags = req->r_flags;
2042         u64 data_len;
2043         unsigned int i;
2044
2045         req->r_snapid = snap_id;
2046         req->r_snapc = ceph_get_snap_context(snapc);
2047
2048         /* encode request */
2049         msg->hdr.version = cpu_to_le16(4);
2050
2051         p = msg->front.iov_base;
2052         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2053         req->r_request_osdmap_epoch = p;
2054         p += 4;
2055         req->r_request_flags = p;
2056         p += 4;
2057         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2058                 ceph_encode_timespec(p, mtime);
2059         p += sizeof(struct ceph_timespec);
2060         req->r_request_reassert_version = p;
2061         p += sizeof(struct ceph_eversion); /* will get filled in */
2062
2063         /* oloc */
2064         ceph_encode_8(&p, 4);
2065         ceph_encode_8(&p, 4);
2066         ceph_encode_32(&p, 8 + 4 + 4);
2067         req->r_request_pool = p;
2068         p += 8;
2069         ceph_encode_32(&p, -1);  /* preferred */
2070         ceph_encode_32(&p, 0);   /* key len */
2071
2072         ceph_encode_8(&p, 1);
2073         req->r_request_pgid = p;
2074         p += 8 + 4;
2075         ceph_encode_32(&p, -1);  /* preferred */
2076
2077         /* oid */
2078         ceph_encode_32(&p, req->r_oid_len);
2079         memcpy(p, req->r_oid, req->r_oid_len);
2080         dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
2081         p += req->r_oid_len;
2082
2083         /* ops--can imply data */
2084         ceph_encode_16(&p, (u16)req->r_num_ops);
2085         data_len = 0;
2086         for (i = 0; i < req->r_num_ops; i++) {
2087                 data_len += osd_req_encode_op(req, p, i);
2088                 p += sizeof(struct ceph_osd_op);
2089         }
2090
2091         /* snaps */
2092         ceph_encode_64(&p, req->r_snapid);
2093         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2094         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2095         if (req->r_snapc) {
2096                 for (i = 0; i < snapc->num_snaps; i++) {
2097                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2098                 }
2099         }
2100
2101         req->r_request_attempts = p;
2102         p += 4;
2103
2104         /* data */
2105         if (flags & CEPH_OSD_FLAG_WRITE) {
2106                 u16 data_off;
2107
2108                 /*
2109                  * The header "data_off" is a hint to the receiver
2110                  * allowing it to align received data into its
2111                  * buffers such that there's no need to re-copy
2112                  * it before writing it to disk (direct I/O).
2113                  */
2114                 data_off = (u16) (off & 0xffff);
2115                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2116         }
2117         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2118
2119         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2120         msg_size = p - msg->front.iov_base;
2121         msg->front.iov_len = msg_size;
2122         msg->hdr.front_len = cpu_to_le32(msg_size);
2123
2124         dout("build_request msg_size was %d\n", (int)msg_size);
2125 }
2126 EXPORT_SYMBOL(ceph_osdc_build_request);
2127
2128 /*
2129  * Register request, send initial attempt.
2130  */
2131 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2132                             struct ceph_osd_request *req,
2133                             bool nofail)
2134 {
2135         int rc = 0;
2136
2137         down_read(&osdc->map_sem);
2138         mutex_lock(&osdc->request_mutex);
2139         __register_request(osdc, req);
2140         req->r_sent = 0;
2141         req->r_got_reply = 0;
2142         rc = __map_request(osdc, req, 0);
2143         if (rc < 0) {
2144                 if (nofail) {
2145                         dout("osdc_start_request failed map, "
2146                                 " will retry %lld\n", req->r_tid);
2147                         rc = 0;
2148                 } else {
2149                         __unregister_request(osdc, req);
2150                 }
2151                 goto out_unlock;
2152         }
2153         if (req->r_osd == NULL) {
2154                 dout("send_request %p no up osds in pg\n", req);
2155                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2156         } else {
2157                 __send_queued(osdc);
2158         }
2159         rc = 0;
2160 out_unlock:
2161         mutex_unlock(&osdc->request_mutex);
2162         up_read(&osdc->map_sem);
2163         return rc;
2164 }
2165 EXPORT_SYMBOL(ceph_osdc_start_request);
2166
2167 /*
2168  * wait for a request to complete
2169  */
2170 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2171                            struct ceph_osd_request *req)
2172 {
2173         int rc;
2174
2175         rc = wait_for_completion_interruptible(&req->r_completion);
2176         if (rc < 0) {
2177                 mutex_lock(&osdc->request_mutex);
2178                 __cancel_request(req);
2179                 __unregister_request(osdc, req);
2180                 mutex_unlock(&osdc->request_mutex);
2181                 complete_request(req);
2182                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2183                 return rc;
2184         }
2185
2186         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2187         return req->r_result;
2188 }
2189 EXPORT_SYMBOL(ceph_osdc_wait_request);
2190
2191 /*
2192  * sync - wait for all in-flight requests to flush.  avoid starvation.
2193  */
2194 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2195 {
2196         struct ceph_osd_request *req;
2197         u64 last_tid, next_tid = 0;
2198
2199         mutex_lock(&osdc->request_mutex);
2200         last_tid = osdc->last_tid;
2201         while (1) {
2202                 req = __lookup_request_ge(osdc, next_tid);
2203                 if (!req)
2204                         break;
2205                 if (req->r_tid > last_tid)
2206                         break;
2207
2208                 next_tid = req->r_tid + 1;
2209                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2210                         continue;
2211
2212                 ceph_osdc_get_request(req);
2213                 mutex_unlock(&osdc->request_mutex);
2214                 dout("sync waiting on tid %llu (last is %llu)\n",
2215                      req->r_tid, last_tid);
2216                 wait_for_completion(&req->r_safe_completion);
2217                 mutex_lock(&osdc->request_mutex);
2218                 ceph_osdc_put_request(req);
2219         }
2220         mutex_unlock(&osdc->request_mutex);
2221         dout("sync done (thru tid %llu)\n", last_tid);
2222 }
2223 EXPORT_SYMBOL(ceph_osdc_sync);
2224
2225 /*
2226  * Call all pending notify callbacks - for use after a watch is
2227  * unregistered, to make sure no more callbacks for it will be invoked
2228  */
2229 extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2230 {
2231         flush_workqueue(osdc->notify_wq);
2232 }
2233 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2234
2235
2236 /*
2237  * init, shutdown
2238  */
2239 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2240 {
2241         int err;
2242
2243         dout("init\n");
2244         osdc->client = client;
2245         osdc->osdmap = NULL;
2246         init_rwsem(&osdc->map_sem);
2247         init_completion(&osdc->map_waiters);
2248         osdc->last_requested_map = 0;
2249         mutex_init(&osdc->request_mutex);
2250         osdc->last_tid = 0;
2251         osdc->osds = RB_ROOT;
2252         INIT_LIST_HEAD(&osdc->osd_lru);
2253         osdc->requests = RB_ROOT;
2254         INIT_LIST_HEAD(&osdc->req_lru);
2255         INIT_LIST_HEAD(&osdc->req_unsent);
2256         INIT_LIST_HEAD(&osdc->req_notarget);
2257         INIT_LIST_HEAD(&osdc->req_linger);
2258         osdc->num_requests = 0;
2259         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2260         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2261         spin_lock_init(&osdc->event_lock);
2262         osdc->event_tree = RB_ROOT;
2263         osdc->event_count = 0;
2264
2265         schedule_delayed_work(&osdc->osds_timeout_work,
2266            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2267
2268         err = -ENOMEM;
2269         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2270                                         sizeof(struct ceph_osd_request));
2271         if (!osdc->req_mempool)
2272                 goto out;
2273
2274         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2275                                 OSD_OP_FRONT_LEN, 10, true,
2276                                 "osd_op");
2277         if (err < 0)
2278                 goto out_mempool;
2279         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2280                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2281                                 "osd_op_reply");
2282         if (err < 0)
2283                 goto out_msgpool;
2284
2285         err = -ENOMEM;
2286         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2287         if (!osdc->notify_wq)
2288                 goto out_msgpool;
2289         return 0;
2290
2291 out_msgpool:
2292         ceph_msgpool_destroy(&osdc->msgpool_op);
2293 out_mempool:
2294         mempool_destroy(osdc->req_mempool);
2295 out:
2296         return err;
2297 }
2298
2299 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2300 {
2301         flush_workqueue(osdc->notify_wq);
2302         destroy_workqueue(osdc->notify_wq);
2303         cancel_delayed_work_sync(&osdc->timeout_work);
2304         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2305         if (osdc->osdmap) {
2306                 ceph_osdmap_destroy(osdc->osdmap);
2307                 osdc->osdmap = NULL;
2308         }
2309         remove_all_osds(osdc);
2310         mempool_destroy(osdc->req_mempool);
2311         ceph_msgpool_destroy(&osdc->msgpool_op);
2312         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2313 }
2314
2315 /*
2316  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2317  * *plen.  Return number of bytes read, or error.
2318  */
2319 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2320                         struct ceph_vino vino, struct ceph_file_layout *layout,
2321                         u64 off, u64 *plen,
2322                         u32 truncate_seq, u64 truncate_size,
2323                         struct page **pages, int num_pages, int page_align)
2324 {
2325         struct ceph_osd_request *req;
2326         int rc = 0;
2327
2328         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2329              vino.snap, off, *plen);
2330         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2331                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2332                                     NULL, truncate_seq, truncate_size,
2333                                     false);
2334         if (IS_ERR(req))
2335                 return PTR_ERR(req);
2336
2337         /* it may be a short read due to an object boundary */
2338
2339         osd_req_op_extent_osd_data_pages(req, 0,
2340                                 pages, *plen, page_align, false, false);
2341
2342         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2343              off, *plen, *plen, page_align);
2344
2345         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2346
2347         rc = ceph_osdc_start_request(osdc, req, false);
2348         if (!rc)
2349                 rc = ceph_osdc_wait_request(osdc, req);
2350
2351         ceph_osdc_put_request(req);
2352         dout("readpages result %d\n", rc);
2353         return rc;
2354 }
2355 EXPORT_SYMBOL(ceph_osdc_readpages);
2356
2357 /*
2358  * do a synchronous write on N pages
2359  */
2360 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2361                          struct ceph_file_layout *layout,
2362                          struct ceph_snap_context *snapc,
2363                          u64 off, u64 len,
2364                          u32 truncate_seq, u64 truncate_size,
2365                          struct timespec *mtime,
2366                          struct page **pages, int num_pages)
2367 {
2368         struct ceph_osd_request *req;
2369         int rc = 0;
2370         int page_align = off & ~PAGE_MASK;
2371
2372         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2373         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2374                                     CEPH_OSD_OP_WRITE,
2375                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2376                                     snapc, truncate_seq, truncate_size,
2377                                     true);
2378         if (IS_ERR(req))
2379                 return PTR_ERR(req);
2380
2381         /* it may be a short write due to an object boundary */
2382         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2383                                 false, false);
2384         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2385
2386         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2387
2388         rc = ceph_osdc_start_request(osdc, req, true);
2389         if (!rc)
2390                 rc = ceph_osdc_wait_request(osdc, req);
2391
2392         ceph_osdc_put_request(req);
2393         if (rc == 0)
2394                 rc = len;
2395         dout("writepages result %d\n", rc);
2396         return rc;
2397 }
2398 EXPORT_SYMBOL(ceph_osdc_writepages);
2399
2400 int ceph_osdc_setup(void)
2401 {
2402         BUG_ON(ceph_osd_request_cache);
2403         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2404                                         sizeof (struct ceph_osd_request),
2405                                         __alignof__(struct ceph_osd_request),
2406                                         0, NULL);
2407
2408         return ceph_osd_request_cache ? 0 : -ENOMEM;
2409 }
2410 EXPORT_SYMBOL(ceph_osdc_setup);
2411
2412 void ceph_osdc_cleanup(void)
2413 {
2414         BUG_ON(!ceph_osd_request_cache);
2415         kmem_cache_destroy(ceph_osd_request_cache);
2416         ceph_osd_request_cache = NULL;
2417 }
2418 EXPORT_SYMBOL(ceph_osdc_cleanup);
2419
2420 /*
2421  * handle incoming message
2422  */
2423 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2424 {
2425         struct ceph_osd *osd = con->private;
2426         struct ceph_osd_client *osdc;
2427         int type = le16_to_cpu(msg->hdr.type);
2428
2429         if (!osd)
2430                 goto out;
2431         osdc = osd->o_osdc;
2432
2433         switch (type) {
2434         case CEPH_MSG_OSD_MAP:
2435                 ceph_osdc_handle_map(osdc, msg);
2436                 break;
2437         case CEPH_MSG_OSD_OPREPLY:
2438                 handle_reply(osdc, msg, con);
2439                 break;
2440         case CEPH_MSG_WATCH_NOTIFY:
2441                 handle_watch_notify(osdc, msg);
2442                 break;
2443
2444         default:
2445                 pr_err("received unknown message type %d %s\n", type,
2446                        ceph_msg_type_name(type));
2447         }
2448 out:
2449         ceph_msg_put(msg);
2450 }
2451
2452 /*
2453  * lookup and return message for incoming reply.  set up reply message
2454  * pages.
2455  */
2456 static struct ceph_msg *get_reply(struct ceph_connection *con,
2457                                   struct ceph_msg_header *hdr,
2458                                   int *skip)
2459 {
2460         struct ceph_osd *osd = con->private;
2461         struct ceph_osd_client *osdc = osd->o_osdc;
2462         struct ceph_msg *m;
2463         struct ceph_osd_request *req;
2464         int front = le32_to_cpu(hdr->front_len);
2465         int data_len = le32_to_cpu(hdr->data_len);
2466         u64 tid;
2467
2468         tid = le64_to_cpu(hdr->tid);
2469         mutex_lock(&osdc->request_mutex);
2470         req = __lookup_request(osdc, tid);
2471         if (!req) {
2472                 *skip = 1;
2473                 m = NULL;
2474                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2475                      osd->o_osd);
2476                 goto out;
2477         }
2478
2479         if (req->r_reply->con)
2480                 dout("%s revoking msg %p from old con %p\n", __func__,
2481                      req->r_reply, req->r_reply->con);
2482         ceph_msg_revoke_incoming(req->r_reply);
2483
2484         if (front > req->r_reply->front.iov_len) {
2485                 pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n",
2486                            front, (int)req->r_reply->front.iov_len,
2487                            (unsigned int)con->peer_name.type,
2488                            le64_to_cpu(con->peer_name.num));
2489                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2490                 if (!m)
2491                         goto out;
2492                 ceph_msg_put(req->r_reply);
2493                 req->r_reply = m;
2494         }
2495         m = ceph_msg_get(req->r_reply);
2496
2497         if (data_len > 0) {
2498                 struct ceph_osd_data *osd_data;
2499
2500                 /*
2501                  * XXX This is assuming there is only one op containing
2502                  * XXX page data.  Probably OK for reads, but this
2503                  * XXX ought to be done more generally.
2504                  */
2505                 osd_data = osd_req_op_extent_osd_data(req, 0);
2506                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2507                         if (osd_data->pages &&
2508                                 unlikely(osd_data->length < data_len)) {
2509
2510                                 pr_warning("tid %lld reply has %d bytes "
2511                                         "we had only %llu bytes ready\n",
2512                                         tid, data_len, osd_data->length);
2513                                 *skip = 1;
2514                                 ceph_msg_put(m);
2515                                 m = NULL;
2516                                 goto out;
2517                         }
2518                 }
2519         }
2520         *skip = 0;
2521         dout("get_reply tid %lld %p\n", tid, m);
2522
2523 out:
2524         mutex_unlock(&osdc->request_mutex);
2525         return m;
2526
2527 }
2528
2529 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2530                                   struct ceph_msg_header *hdr,
2531                                   int *skip)
2532 {
2533         struct ceph_osd *osd = con->private;
2534         int type = le16_to_cpu(hdr->type);
2535         int front = le32_to_cpu(hdr->front_len);
2536
2537         *skip = 0;
2538         switch (type) {
2539         case CEPH_MSG_OSD_MAP:
2540         case CEPH_MSG_WATCH_NOTIFY:
2541                 return ceph_msg_new(type, front, GFP_NOFS, false);
2542         case CEPH_MSG_OSD_OPREPLY:
2543                 return get_reply(con, hdr, skip);
2544         default:
2545                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2546                         osd->o_osd);
2547                 *skip = 1;
2548                 return NULL;
2549         }
2550 }
2551
2552 /*
2553  * Wrappers to refcount containing ceph_osd struct
2554  */
2555 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2556 {
2557         struct ceph_osd *osd = con->private;
2558         if (get_osd(osd))
2559                 return con;
2560         return NULL;
2561 }
2562
2563 static void put_osd_con(struct ceph_connection *con)
2564 {
2565         struct ceph_osd *osd = con->private;
2566         put_osd(osd);
2567 }
2568
2569 /*
2570  * authentication
2571  */
2572 /*
2573  * Note: returned pointer is the address of a structure that's
2574  * managed separately.  Caller must *not* attempt to free it.
2575  */
2576 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2577                                         int *proto, int force_new)
2578 {
2579         struct ceph_osd *o = con->private;
2580         struct ceph_osd_client *osdc = o->o_osdc;
2581         struct ceph_auth_client *ac = osdc->client->monc.auth;
2582         struct ceph_auth_handshake *auth = &o->o_auth;
2583
2584         if (force_new && auth->authorizer) {
2585                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2586                 auth->authorizer = NULL;
2587         }
2588         if (!auth->authorizer) {
2589                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2590                                                       auth);
2591                 if (ret)
2592                         return ERR_PTR(ret);
2593         } else {
2594                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2595                                                      auth);
2596                 if (ret)
2597                         return ERR_PTR(ret);
2598         }
2599         *proto = ac->protocol;
2600
2601         return auth;
2602 }
2603
2604
2605 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2606 {
2607         struct ceph_osd *o = con->private;
2608         struct ceph_osd_client *osdc = o->o_osdc;
2609         struct ceph_auth_client *ac = osdc->client->monc.auth;
2610
2611         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2612 }
2613
2614 static int invalidate_authorizer(struct ceph_connection *con)
2615 {
2616         struct ceph_osd *o = con->private;
2617         struct ceph_osd_client *osdc = o->o_osdc;
2618         struct ceph_auth_client *ac = osdc->client->monc.auth;
2619
2620         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2621         return ceph_monc_validate_auth(&osdc->client->monc);
2622 }
2623
2624 static const struct ceph_connection_operations osd_con_ops = {
2625         .get = get_osd_con,
2626         .put = put_osd_con,
2627         .dispatch = dispatch,
2628         .get_authorizer = get_authorizer,
2629         .verify_authorizer_reply = verify_authorizer_reply,
2630         .invalidate_authorizer = invalidate_authorizer,
2631         .alloc_msg = alloc_msg,
2632         .fault = osd_reset,
2633 };