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Linux/net/ceph/osd_client.c

Version: ~ [ linux-5.19-rc5 ] ~ [ linux-5.18.9 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.52 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.128 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.203 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.250 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.286 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.320 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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  1 
  2 #include <linux/ceph/ceph_debug.h>
  3 
  4 #include <linux/module.h>
  5 #include <linux/err.h>
  6 #include <linux/highmem.h>
  7 #include <linux/mm.h>
  8 #include <linux/pagemap.h>
  9 #include <linux/slab.h>
 10 #include <linux/uaccess.h>
 11 #ifdef CONFIG_BLOCK
 12 #include <linux/bio.h>
 13 #endif
 14 
 15 #include <linux/ceph/libceph.h>
 16 #include <linux/ceph/osd_client.h>
 17 #include <linux/ceph/messenger.h>
 18 #include <linux/ceph/decode.h>
 19 #include <linux/ceph/auth.h>
 20 #include <linux/ceph/pagelist.h>
 21 
 22 #define OSD_OP_FRONT_LEN        4096
 23 #define OSD_OPREPLY_FRONT_LEN   512
 24 
 25 static struct kmem_cache        *ceph_osd_request_cache;
 26 
 27 static const struct ceph_connection_operations osd_con_ops;
 28 
 29 static void __send_queued(struct ceph_osd_client *osdc);
 30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
 31 static void __register_request(struct ceph_osd_client *osdc,
 32                                struct ceph_osd_request *req);
 33 static void __unregister_request(struct ceph_osd_client *osdc,
 34                                  struct ceph_osd_request *req);
 35 static void __unregister_linger_request(struct ceph_osd_client *osdc,
 36                                         struct ceph_osd_request *req);
 37 static void __enqueue_request(struct ceph_osd_request *req);
 38 static void __send_request(struct ceph_osd_client *osdc,
 39                            struct ceph_osd_request *req);
 40 
 41 /*
 42  * Implement client access to distributed object storage cluster.
 43  *
 44  * All data objects are stored within a cluster/cloud of OSDs, or
 45  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
 46  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
 47  * remote daemons serving up and coordinating consistent and safe
 48  * access to storage.
 49  *
 50  * Cluster membership and the mapping of data objects onto storage devices
 51  * are described by the osd map.
 52  *
 53  * We keep track of pending OSD requests (read, write), resubmit
 54  * requests to different OSDs when the cluster topology/data layout
 55  * change, or retry the affected requests when the communications
 56  * channel with an OSD is reset.
 57  */
 58 
 59 /*
 60  * calculate the mapping of a file extent onto an object, and fill out the
 61  * request accordingly.  shorten extent as necessary if it crosses an
 62  * object boundary.
 63  *
 64  * fill osd op in request message.
 65  */
 66 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
 67                         u64 *objnum, u64 *objoff, u64 *objlen)
 68 {
 69         u64 orig_len = *plen;
 70         int r;
 71 
 72         /* object extent? */
 73         r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
 74                                           objoff, objlen);
 75         if (r < 0)
 76                 return r;
 77         if (*objlen < orig_len) {
 78                 *plen = *objlen;
 79                 dout(" skipping last %llu, final file extent %llu~%llu\n",
 80                      orig_len - *plen, off, *plen);
 81         }
 82 
 83         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
 84 
 85         return 0;
 86 }
 87 
 88 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
 89 {
 90         memset(osd_data, 0, sizeof (*osd_data));
 91         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
 92 }
 93 
 94 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
 95                         struct page **pages, u64 length, u32 alignment,
 96                         bool pages_from_pool, bool own_pages)
 97 {
 98         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
 99         osd_data->pages = pages;
100         osd_data->length = length;
101         osd_data->alignment = alignment;
102         osd_data->pages_from_pool = pages_from_pool;
103         osd_data->own_pages = own_pages;
104 }
105 
106 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
107                         struct ceph_pagelist *pagelist)
108 {
109         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
110         osd_data->pagelist = pagelist;
111 }
112 
113 #ifdef CONFIG_BLOCK
114 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
115                         struct bio *bio, size_t bio_length)
116 {
117         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
118         osd_data->bio = bio;
119         osd_data->bio_length = bio_length;
120 }
121 #endif /* CONFIG_BLOCK */
122 
123 #define osd_req_op_data(oreq, whch, typ, fld)   \
124         ({                                              \
125                 BUG_ON(whch >= (oreq)->r_num_ops);      \
126                 &(oreq)->r_ops[whch].typ.fld;           \
127         })
128 
129 static struct ceph_osd_data *
130 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
131 {
132         BUG_ON(which >= osd_req->r_num_ops);
133 
134         return &osd_req->r_ops[which].raw_data_in;
135 }
136 
137 struct ceph_osd_data *
138 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
139                         unsigned int which)
140 {
141         return osd_req_op_data(osd_req, which, extent, osd_data);
142 }
143 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
144 
145 struct ceph_osd_data *
146 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
147                         unsigned int which)
148 {
149         return osd_req_op_data(osd_req, which, cls, response_data);
150 }
151 EXPORT_SYMBOL(osd_req_op_cls_response_data);    /* ??? */
152 
153 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
154                         unsigned int which, struct page **pages,
155                         u64 length, u32 alignment,
156                         bool pages_from_pool, bool own_pages)
157 {
158         struct ceph_osd_data *osd_data;
159 
160         osd_data = osd_req_op_raw_data_in(osd_req, which);
161         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
162                                 pages_from_pool, own_pages);
163 }
164 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
165 
166 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
167                         unsigned int which, struct page **pages,
168                         u64 length, u32 alignment,
169                         bool pages_from_pool, bool own_pages)
170 {
171         struct ceph_osd_data *osd_data;
172 
173         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
174         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
175                                 pages_from_pool, own_pages);
176 }
177 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
178 
179 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
180                         unsigned int which, struct ceph_pagelist *pagelist)
181 {
182         struct ceph_osd_data *osd_data;
183 
184         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
185         ceph_osd_data_pagelist_init(osd_data, pagelist);
186 }
187 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
188 
189 #ifdef CONFIG_BLOCK
190 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
191                         unsigned int which, struct bio *bio, size_t bio_length)
192 {
193         struct ceph_osd_data *osd_data;
194 
195         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
196         ceph_osd_data_bio_init(osd_data, bio, bio_length);
197 }
198 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
199 #endif /* CONFIG_BLOCK */
200 
201 static void osd_req_op_cls_request_info_pagelist(
202                         struct ceph_osd_request *osd_req,
203                         unsigned int which, struct ceph_pagelist *pagelist)
204 {
205         struct ceph_osd_data *osd_data;
206 
207         osd_data = osd_req_op_data(osd_req, which, cls, request_info);
208         ceph_osd_data_pagelist_init(osd_data, pagelist);
209 }
210 
211 void osd_req_op_cls_request_data_pagelist(
212                         struct ceph_osd_request *osd_req,
213                         unsigned int which, struct ceph_pagelist *pagelist)
214 {
215         struct ceph_osd_data *osd_data;
216 
217         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
218         ceph_osd_data_pagelist_init(osd_data, pagelist);
219 }
220 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
221 
222 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
223                         unsigned int which, struct page **pages, u64 length,
224                         u32 alignment, bool pages_from_pool, bool own_pages)
225 {
226         struct ceph_osd_data *osd_data;
227 
228         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
229         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
230                                 pages_from_pool, own_pages);
231 }
232 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
233 
234 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
235                         unsigned int which, struct page **pages, u64 length,
236                         u32 alignment, bool pages_from_pool, bool own_pages)
237 {
238         struct ceph_osd_data *osd_data;
239 
240         osd_data = osd_req_op_data(osd_req, which, cls, response_data);
241         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
242                                 pages_from_pool, own_pages);
243 }
244 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
245 
246 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
247 {
248         switch (osd_data->type) {
249         case CEPH_OSD_DATA_TYPE_NONE:
250                 return 0;
251         case CEPH_OSD_DATA_TYPE_PAGES:
252                 return osd_data->length;
253         case CEPH_OSD_DATA_TYPE_PAGELIST:
254                 return (u64)osd_data->pagelist->length;
255 #ifdef CONFIG_BLOCK
256         case CEPH_OSD_DATA_TYPE_BIO:
257                 return (u64)osd_data->bio_length;
258 #endif /* CONFIG_BLOCK */
259         default:
260                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
261                 return 0;
262         }
263 }
264 
265 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
266 {
267         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
268                 int num_pages;
269 
270                 num_pages = calc_pages_for((u64)osd_data->alignment,
271                                                 (u64)osd_data->length);
272                 ceph_release_page_vector(osd_data->pages, num_pages);
273         }
274         ceph_osd_data_init(osd_data);
275 }
276 
277 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
278                         unsigned int which)
279 {
280         struct ceph_osd_req_op *op;
281 
282         BUG_ON(which >= osd_req->r_num_ops);
283         op = &osd_req->r_ops[which];
284 
285         switch (op->op) {
286         case CEPH_OSD_OP_READ:
287         case CEPH_OSD_OP_WRITE:
288                 ceph_osd_data_release(&op->extent.osd_data);
289                 break;
290         case CEPH_OSD_OP_CALL:
291                 ceph_osd_data_release(&op->cls.request_info);
292                 ceph_osd_data_release(&op->cls.request_data);
293                 ceph_osd_data_release(&op->cls.response_data);
294                 break;
295         case CEPH_OSD_OP_SETXATTR:
296         case CEPH_OSD_OP_CMPXATTR:
297                 ceph_osd_data_release(&op->xattr.osd_data);
298                 break;
299         default:
300                 break;
301         }
302 }
303 
304 /*
305  * requests
306  */
307 static void ceph_osdc_release_request(struct kref *kref)
308 {
309         struct ceph_osd_request *req = container_of(kref,
310                                             struct ceph_osd_request, r_kref);
311         unsigned int which;
312 
313         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
314              req->r_request, req->r_reply);
315         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
316         WARN_ON(!list_empty(&req->r_req_lru_item));
317         WARN_ON(!list_empty(&req->r_osd_item));
318         WARN_ON(!list_empty(&req->r_linger_item));
319         WARN_ON(!list_empty(&req->r_linger_osd_item));
320         WARN_ON(req->r_osd);
321 
322         if (req->r_request)
323                 ceph_msg_put(req->r_request);
324         if (req->r_reply) {
325                 ceph_msg_revoke_incoming(req->r_reply);
326                 ceph_msg_put(req->r_reply);
327         }
328 
329         for (which = 0; which < req->r_num_ops; which++)
330                 osd_req_op_data_release(req, which);
331 
332         ceph_put_snap_context(req->r_snapc);
333         if (req->r_mempool)
334                 mempool_free(req, req->r_osdc->req_mempool);
335         else
336                 kmem_cache_free(ceph_osd_request_cache, req);
337 
338 }
339 
340 void ceph_osdc_get_request(struct ceph_osd_request *req)
341 {
342         dout("%s %p (was %d)\n", __func__, req,
343              atomic_read(&req->r_kref.refcount));
344         kref_get(&req->r_kref);
345 }
346 EXPORT_SYMBOL(ceph_osdc_get_request);
347 
348 void ceph_osdc_put_request(struct ceph_osd_request *req)
349 {
350         dout("%s %p (was %d)\n", __func__, req,
351              atomic_read(&req->r_kref.refcount));
352         kref_put(&req->r_kref, ceph_osdc_release_request);
353 }
354 EXPORT_SYMBOL(ceph_osdc_put_request);
355 
356 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
357                                                struct ceph_snap_context *snapc,
358                                                unsigned int num_ops,
359                                                bool use_mempool,
360                                                gfp_t gfp_flags)
361 {
362         struct ceph_osd_request *req;
363         struct ceph_msg *msg;
364         size_t msg_size;
365 
366         BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
367         BUG_ON(num_ops > CEPH_OSD_MAX_OP);
368 
369         msg_size = 4 + 4 + 8 + 8 + 4+8;
370         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
371         msg_size += 1 + 8 + 4 + 4;     /* pg_t */
372         msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
373         msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
374         msg_size += 8;  /* snapid */
375         msg_size += 8;  /* snap_seq */
376         msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
377         msg_size += 4;
378 
379         if (use_mempool) {
380                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
381                 memset(req, 0, sizeof(*req));
382         } else {
383                 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
384         }
385         if (req == NULL)
386                 return NULL;
387 
388         req->r_osdc = osdc;
389         req->r_mempool = use_mempool;
390         req->r_num_ops = num_ops;
391 
392         kref_init(&req->r_kref);
393         init_completion(&req->r_completion);
394         init_completion(&req->r_safe_completion);
395         RB_CLEAR_NODE(&req->r_node);
396         INIT_LIST_HEAD(&req->r_unsafe_item);
397         INIT_LIST_HEAD(&req->r_linger_item);
398         INIT_LIST_HEAD(&req->r_linger_osd_item);
399         INIT_LIST_HEAD(&req->r_req_lru_item);
400         INIT_LIST_HEAD(&req->r_osd_item);
401 
402         req->r_base_oloc.pool = -1;
403         req->r_target_oloc.pool = -1;
404 
405         /* create reply message */
406         if (use_mempool)
407                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
408         else
409                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
410                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
411         if (!msg) {
412                 ceph_osdc_put_request(req);
413                 return NULL;
414         }
415         req->r_reply = msg;
416 
417         /* create request message; allow space for oid */
418         if (use_mempool)
419                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
420         else
421                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
422         if (!msg) {
423                 ceph_osdc_put_request(req);
424                 return NULL;
425         }
426 
427         memset(msg->front.iov_base, 0, msg->front.iov_len);
428 
429         req->r_request = msg;
430 
431         return req;
432 }
433 EXPORT_SYMBOL(ceph_osdc_alloc_request);
434 
435 static bool osd_req_opcode_valid(u16 opcode)
436 {
437         switch (opcode) {
438 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
439 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
440 #undef GENERATE_CASE
441         default:
442                 return false;
443         }
444 }
445 
446 /*
447  * This is an osd op init function for opcodes that have no data or
448  * other information associated with them.  It also serves as a
449  * common init routine for all the other init functions, below.
450  */
451 static struct ceph_osd_req_op *
452 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
453                                 u16 opcode)
454 {
455         struct ceph_osd_req_op *op;
456 
457         BUG_ON(which >= osd_req->r_num_ops);
458         BUG_ON(!osd_req_opcode_valid(opcode));
459 
460         op = &osd_req->r_ops[which];
461         memset(op, 0, sizeof (*op));
462         op->op = opcode;
463 
464         return op;
465 }
466 
467 void osd_req_op_init(struct ceph_osd_request *osd_req,
468                                 unsigned int which, u16 opcode)
469 {
470         (void)_osd_req_op_init(osd_req, which, opcode);
471 }
472 EXPORT_SYMBOL(osd_req_op_init);
473 
474 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
475                                 unsigned int which, u16 opcode,
476                                 u64 offset, u64 length,
477                                 u64 truncate_size, u32 truncate_seq)
478 {
479         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
480         size_t payload_len = 0;
481 
482         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
483                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE);
484 
485         op->extent.offset = offset;
486         op->extent.length = length;
487         op->extent.truncate_size = truncate_size;
488         op->extent.truncate_seq = truncate_seq;
489         if (opcode == CEPH_OSD_OP_WRITE)
490                 payload_len += length;
491 
492         op->payload_len = payload_len;
493 }
494 EXPORT_SYMBOL(osd_req_op_extent_init);
495 
496 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
497                                 unsigned int which, u64 length)
498 {
499         struct ceph_osd_req_op *op;
500         u64 previous;
501 
502         BUG_ON(which >= osd_req->r_num_ops);
503         op = &osd_req->r_ops[which];
504         previous = op->extent.length;
505 
506         if (length == previous)
507                 return;         /* Nothing to do */
508         BUG_ON(length > previous);
509 
510         op->extent.length = length;
511         op->payload_len -= previous - length;
512 }
513 EXPORT_SYMBOL(osd_req_op_extent_update);
514 
515 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
516                         u16 opcode, const char *class, const char *method)
517 {
518         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
519         struct ceph_pagelist *pagelist;
520         size_t payload_len = 0;
521         size_t size;
522 
523         BUG_ON(opcode != CEPH_OSD_OP_CALL);
524 
525         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
526         BUG_ON(!pagelist);
527         ceph_pagelist_init(pagelist);
528 
529         op->cls.class_name = class;
530         size = strlen(class);
531         BUG_ON(size > (size_t) U8_MAX);
532         op->cls.class_len = size;
533         ceph_pagelist_append(pagelist, class, size);
534         payload_len += size;
535 
536         op->cls.method_name = method;
537         size = strlen(method);
538         BUG_ON(size > (size_t) U8_MAX);
539         op->cls.method_len = size;
540         ceph_pagelist_append(pagelist, method, size);
541         payload_len += size;
542 
543         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
544 
545         op->cls.argc = 0;       /* currently unused */
546 
547         op->payload_len = payload_len;
548 }
549 EXPORT_SYMBOL(osd_req_op_cls_init);
550 
551 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
552                           u16 opcode, const char *name, const void *value,
553                           size_t size, u8 cmp_op, u8 cmp_mode)
554 {
555         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
556         struct ceph_pagelist *pagelist;
557         size_t payload_len;
558 
559         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
560 
561         pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
562         if (!pagelist)
563                 return -ENOMEM;
564 
565         ceph_pagelist_init(pagelist);
566 
567         payload_len = strlen(name);
568         op->xattr.name_len = payload_len;
569         ceph_pagelist_append(pagelist, name, payload_len);
570 
571         op->xattr.value_len = size;
572         ceph_pagelist_append(pagelist, value, size);
573         payload_len += size;
574 
575         op->xattr.cmp_op = cmp_op;
576         op->xattr.cmp_mode = cmp_mode;
577 
578         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
579         op->payload_len = payload_len;
580         return 0;
581 }
582 EXPORT_SYMBOL(osd_req_op_xattr_init);
583 
584 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
585                                 unsigned int which, u16 opcode,
586                                 u64 cookie, u64 version, int flag)
587 {
588         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
589 
590         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
591 
592         op->watch.cookie = cookie;
593         op->watch.ver = version;
594         if (opcode == CEPH_OSD_OP_WATCH && flag)
595                 op->watch.flag = (u8)1;
596 }
597 EXPORT_SYMBOL(osd_req_op_watch_init);
598 
599 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
600                                 unsigned int which,
601                                 u64 expected_object_size,
602                                 u64 expected_write_size)
603 {
604         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
605                                                       CEPH_OSD_OP_SETALLOCHINT);
606 
607         op->alloc_hint.expected_object_size = expected_object_size;
608         op->alloc_hint.expected_write_size = expected_write_size;
609 
610         /*
611          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
612          * not worth a feature bit.  Set FAILOK per-op flag to make
613          * sure older osds don't trip over an unsupported opcode.
614          */
615         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
616 }
617 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
618 
619 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
620                                 struct ceph_osd_data *osd_data)
621 {
622         u64 length = ceph_osd_data_length(osd_data);
623 
624         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
625                 BUG_ON(length > (u64) SIZE_MAX);
626                 if (length)
627                         ceph_msg_data_add_pages(msg, osd_data->pages,
628                                         length, osd_data->alignment);
629         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
630                 BUG_ON(!length);
631                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
632 #ifdef CONFIG_BLOCK
633         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
634                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
635 #endif
636         } else {
637                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
638         }
639 }
640 
641 static u64 osd_req_encode_op(struct ceph_osd_request *req,
642                               struct ceph_osd_op *dst, unsigned int which)
643 {
644         struct ceph_osd_req_op *src;
645         struct ceph_osd_data *osd_data;
646         u64 request_data_len = 0;
647         u64 data_length;
648 
649         BUG_ON(which >= req->r_num_ops);
650         src = &req->r_ops[which];
651         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
652                 pr_err("unrecognized osd opcode %d\n", src->op);
653 
654                 return 0;
655         }
656 
657         switch (src->op) {
658         case CEPH_OSD_OP_STAT:
659                 osd_data = &src->raw_data_in;
660                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
661                 break;
662         case CEPH_OSD_OP_READ:
663         case CEPH_OSD_OP_WRITE:
664         case CEPH_OSD_OP_ZERO:
665         case CEPH_OSD_OP_TRUNCATE:
666                 if (src->op == CEPH_OSD_OP_WRITE)
667                         request_data_len = src->extent.length;
668                 dst->extent.offset = cpu_to_le64(src->extent.offset);
669                 dst->extent.length = cpu_to_le64(src->extent.length);
670                 dst->extent.truncate_size =
671                         cpu_to_le64(src->extent.truncate_size);
672                 dst->extent.truncate_seq =
673                         cpu_to_le32(src->extent.truncate_seq);
674                 osd_data = &src->extent.osd_data;
675                 if (src->op == CEPH_OSD_OP_WRITE)
676                         ceph_osdc_msg_data_add(req->r_request, osd_data);
677                 else
678                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
679                 break;
680         case CEPH_OSD_OP_CALL:
681                 dst->cls.class_len = src->cls.class_len;
682                 dst->cls.method_len = src->cls.method_len;
683                 osd_data = &src->cls.request_info;
684                 ceph_osdc_msg_data_add(req->r_request, osd_data);
685                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
686                 request_data_len = osd_data->pagelist->length;
687 
688                 osd_data = &src->cls.request_data;
689                 data_length = ceph_osd_data_length(osd_data);
690                 if (data_length) {
691                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
692                         dst->cls.indata_len = cpu_to_le32(data_length);
693                         ceph_osdc_msg_data_add(req->r_request, osd_data);
694                         src->payload_len += data_length;
695                         request_data_len += data_length;
696                 }
697                 osd_data = &src->cls.response_data;
698                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
699                 break;
700         case CEPH_OSD_OP_STARTSYNC:
701                 break;
702         case CEPH_OSD_OP_NOTIFY_ACK:
703         case CEPH_OSD_OP_WATCH:
704                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
705                 dst->watch.ver = cpu_to_le64(src->watch.ver);
706                 dst->watch.flag = src->watch.flag;
707                 break;
708         case CEPH_OSD_OP_SETALLOCHINT:
709                 dst->alloc_hint.expected_object_size =
710                     cpu_to_le64(src->alloc_hint.expected_object_size);
711                 dst->alloc_hint.expected_write_size =
712                     cpu_to_le64(src->alloc_hint.expected_write_size);
713                 break;
714         case CEPH_OSD_OP_SETXATTR:
715         case CEPH_OSD_OP_CMPXATTR:
716                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
717                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
718                 dst->xattr.cmp_op = src->xattr.cmp_op;
719                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
720                 osd_data = &src->xattr.osd_data;
721                 ceph_osdc_msg_data_add(req->r_request, osd_data);
722                 request_data_len = osd_data->pagelist->length;
723                 break;
724         case CEPH_OSD_OP_CREATE:
725         case CEPH_OSD_OP_DELETE:
726                 break;
727         default:
728                 pr_err("unsupported osd opcode %s\n",
729                         ceph_osd_op_name(src->op));
730                 WARN_ON(1);
731 
732                 return 0;
733         }
734 
735         dst->op = cpu_to_le16(src->op);
736         dst->flags = cpu_to_le32(src->flags);
737         dst->payload_len = cpu_to_le32(src->payload_len);
738 
739         return request_data_len;
740 }
741 
742 /*
743  * build new request AND message, calculate layout, and adjust file
744  * extent as needed.
745  *
746  * if the file was recently truncated, we include information about its
747  * old and new size so that the object can be updated appropriately.  (we
748  * avoid synchronously deleting truncated objects because it's slow.)
749  *
750  * if @do_sync, include a 'startsync' command so that the osd will flush
751  * data quickly.
752  */
753 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
754                                                struct ceph_file_layout *layout,
755                                                struct ceph_vino vino,
756                                                u64 off, u64 *plen,
757                                                unsigned int which, int num_ops,
758                                                int opcode, int flags,
759                                                struct ceph_snap_context *snapc,
760                                                u32 truncate_seq,
761                                                u64 truncate_size,
762                                                bool use_mempool)
763 {
764         struct ceph_osd_request *req;
765         u64 objnum = 0;
766         u64 objoff = 0;
767         u64 objlen = 0;
768         int r;
769 
770         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
771                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
772                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
773 
774         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
775                                         GFP_NOFS);
776         if (!req)
777                 return ERR_PTR(-ENOMEM);
778 
779         req->r_flags = flags;
780 
781         /* calculate max write size */
782         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
783         if (r < 0) {
784                 ceph_osdc_put_request(req);
785                 return ERR_PTR(r);
786         }
787 
788         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
789                 osd_req_op_init(req, which, opcode);
790         } else {
791                 u32 object_size = le32_to_cpu(layout->fl_object_size);
792                 u32 object_base = off - objoff;
793                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
794                         if (truncate_size <= object_base) {
795                                 truncate_size = 0;
796                         } else {
797                                 truncate_size -= object_base;
798                                 if (truncate_size > object_size)
799                                         truncate_size = object_size;
800                         }
801                 }
802                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
803                                        truncate_size, truncate_seq);
804         }
805 
806         req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
807 
808         snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
809                  "%llx.%08llx", vino.ino, objnum);
810         req->r_base_oid.name_len = strlen(req->r_base_oid.name);
811 
812         return req;
813 }
814 EXPORT_SYMBOL(ceph_osdc_new_request);
815 
816 /*
817  * We keep osd requests in an rbtree, sorted by ->r_tid.
818  */
819 static void __insert_request(struct ceph_osd_client *osdc,
820                              struct ceph_osd_request *new)
821 {
822         struct rb_node **p = &osdc->requests.rb_node;
823         struct rb_node *parent = NULL;
824         struct ceph_osd_request *req = NULL;
825 
826         while (*p) {
827                 parent = *p;
828                 req = rb_entry(parent, struct ceph_osd_request, r_node);
829                 if (new->r_tid < req->r_tid)
830                         p = &(*p)->rb_left;
831                 else if (new->r_tid > req->r_tid)
832                         p = &(*p)->rb_right;
833                 else
834                         BUG();
835         }
836 
837         rb_link_node(&new->r_node, parent, p);
838         rb_insert_color(&new->r_node, &osdc->requests);
839 }
840 
841 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
842                                                  u64 tid)
843 {
844         struct ceph_osd_request *req;
845         struct rb_node *n = osdc->requests.rb_node;
846 
847         while (n) {
848                 req = rb_entry(n, struct ceph_osd_request, r_node);
849                 if (tid < req->r_tid)
850                         n = n->rb_left;
851                 else if (tid > req->r_tid)
852                         n = n->rb_right;
853                 else
854                         return req;
855         }
856         return NULL;
857 }
858 
859 static struct ceph_osd_request *
860 __lookup_request_ge(struct ceph_osd_client *osdc,
861                     u64 tid)
862 {
863         struct ceph_osd_request *req;
864         struct rb_node *n = osdc->requests.rb_node;
865 
866         while (n) {
867                 req = rb_entry(n, struct ceph_osd_request, r_node);
868                 if (tid < req->r_tid) {
869                         if (!n->rb_left)
870                                 return req;
871                         n = n->rb_left;
872                 } else if (tid > req->r_tid) {
873                         n = n->rb_right;
874                 } else {
875                         return req;
876                 }
877         }
878         return NULL;
879 }
880 
881 static void __kick_linger_request(struct ceph_osd_request *req)
882 {
883         struct ceph_osd_client *osdc = req->r_osdc;
884         struct ceph_osd *osd = req->r_osd;
885 
886         /*
887          * Linger requests need to be resent with a new tid to avoid
888          * the dup op detection logic on the OSDs.  Achieve this with
889          * a re-register dance instead of open-coding.
890          */
891         ceph_osdc_get_request(req);
892         if (!list_empty(&req->r_linger_item))
893                 __unregister_linger_request(osdc, req);
894         else
895                 __unregister_request(osdc, req);
896         __register_request(osdc, req);
897         ceph_osdc_put_request(req);
898 
899         /*
900          * Unless request has been registered as both normal and
901          * lingering, __unregister{,_linger}_request clears r_osd.
902          * However, here we need to preserve r_osd to make sure we
903          * requeue on the same OSD.
904          */
905         WARN_ON(req->r_osd || !osd);
906         req->r_osd = osd;
907 
908         dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
909         __enqueue_request(req);
910 }
911 
912 /*
913  * Resubmit requests pending on the given osd.
914  */
915 static void __kick_osd_requests(struct ceph_osd_client *osdc,
916                                 struct ceph_osd *osd)
917 {
918         struct ceph_osd_request *req, *nreq;
919         LIST_HEAD(resend);
920         LIST_HEAD(resend_linger);
921         int err;
922 
923         dout("%s osd%d\n", __func__, osd->o_osd);
924         err = __reset_osd(osdc, osd);
925         if (err)
926                 return;
927 
928         /*
929          * Build up a list of requests to resend by traversing the
930          * osd's list of requests.  Requests for a given object are
931          * sent in tid order, and that is also the order they're
932          * kept on this list.  Therefore all requests that are in
933          * flight will be found first, followed by all requests that
934          * have not yet been sent.  And to resend requests while
935          * preserving this order we will want to put any sent
936          * requests back on the front of the osd client's unsent
937          * list.
938          *
939          * So we build a separate ordered list of already-sent
940          * requests for the affected osd and splice it onto the
941          * front of the osd client's unsent list.  Once we've seen a
942          * request that has not yet been sent we're done.  Those
943          * requests are already sitting right where they belong.
944          */
945         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
946                 if (!req->r_sent)
947                         break;
948 
949                 if (!req->r_linger) {
950                         dout("%s requeueing %p tid %llu\n", __func__, req,
951                              req->r_tid);
952                         list_move_tail(&req->r_req_lru_item, &resend);
953                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
954                 } else {
955                         list_move_tail(&req->r_req_lru_item, &resend_linger);
956                 }
957         }
958         list_splice(&resend, &osdc->req_unsent);
959 
960         /*
961          * Both registered and not yet registered linger requests are
962          * enqueued with a new tid on the same OSD.  We add/move them
963          * to req_unsent/o_requests at the end to keep things in tid
964          * order.
965          */
966         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
967                                  r_linger_osd_item) {
968                 WARN_ON(!list_empty(&req->r_req_lru_item));
969                 __kick_linger_request(req);
970         }
971 
972         list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
973                 __kick_linger_request(req);
974 }
975 
976 /*
977  * If the osd connection drops, we need to resubmit all requests.
978  */
979 static void osd_reset(struct ceph_connection *con)
980 {
981         struct ceph_osd *osd = con->private;
982         struct ceph_osd_client *osdc;
983 
984         if (!osd)
985                 return;
986         dout("osd_reset osd%d\n", osd->o_osd);
987         osdc = osd->o_osdc;
988         down_read(&osdc->map_sem);
989         mutex_lock(&osdc->request_mutex);
990         __kick_osd_requests(osdc, osd);
991         __send_queued(osdc);
992         mutex_unlock(&osdc->request_mutex);
993         up_read(&osdc->map_sem);
994 }
995 
996 /*
997  * Track open sessions with osds.
998  */
999 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1000 {
1001         struct ceph_osd *osd;
1002 
1003         osd = kzalloc(sizeof(*osd), GFP_NOFS);
1004         if (!osd)
1005                 return NULL;
1006 
1007         atomic_set(&osd->o_ref, 1);
1008         osd->o_osdc = osdc;
1009         osd->o_osd = onum;
1010         RB_CLEAR_NODE(&osd->o_node);
1011         INIT_LIST_HEAD(&osd->o_requests);
1012         INIT_LIST_HEAD(&osd->o_linger_requests);
1013         INIT_LIST_HEAD(&osd->o_osd_lru);
1014         osd->o_incarnation = 1;
1015 
1016         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1017 
1018         INIT_LIST_HEAD(&osd->o_keepalive_item);
1019         return osd;
1020 }
1021 
1022 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1023 {
1024         if (atomic_inc_not_zero(&osd->o_ref)) {
1025                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1026                      atomic_read(&osd->o_ref));
1027                 return osd;
1028         } else {
1029                 dout("get_osd %p FAIL\n", osd);
1030                 return NULL;
1031         }
1032 }
1033 
1034 static void put_osd(struct ceph_osd *osd)
1035 {
1036         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1037              atomic_read(&osd->o_ref) - 1);
1038         if (atomic_dec_and_test(&osd->o_ref)) {
1039                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1040 
1041                 if (osd->o_auth.authorizer)
1042                         ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1043                 kfree(osd);
1044         }
1045 }
1046 
1047 /*
1048  * remove an osd from our map
1049  */
1050 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1051 {
1052         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1053         WARN_ON(!list_empty(&osd->o_requests));
1054         WARN_ON(!list_empty(&osd->o_linger_requests));
1055 
1056         list_del_init(&osd->o_osd_lru);
1057         rb_erase(&osd->o_node, &osdc->osds);
1058         RB_CLEAR_NODE(&osd->o_node);
1059 }
1060 
1061 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1062 {
1063         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1064 
1065         if (!RB_EMPTY_NODE(&osd->o_node)) {
1066                 ceph_con_close(&osd->o_con);
1067                 __remove_osd(osdc, osd);
1068                 put_osd(osd);
1069         }
1070 }
1071 
1072 static void remove_all_osds(struct ceph_osd_client *osdc)
1073 {
1074         dout("%s %p\n", __func__, osdc);
1075         mutex_lock(&osdc->request_mutex);
1076         while (!RB_EMPTY_ROOT(&osdc->osds)) {
1077                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1078                                                 struct ceph_osd, o_node);
1079                 remove_osd(osdc, osd);
1080         }
1081         mutex_unlock(&osdc->request_mutex);
1082 }
1083 
1084 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1085                               struct ceph_osd *osd)
1086 {
1087         dout("%s %p\n", __func__, osd);
1088         BUG_ON(!list_empty(&osd->o_osd_lru));
1089 
1090         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1091         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1092 }
1093 
1094 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1095                                   struct ceph_osd *osd)
1096 {
1097         dout("%s %p\n", __func__, osd);
1098 
1099         if (list_empty(&osd->o_requests) &&
1100             list_empty(&osd->o_linger_requests))
1101                 __move_osd_to_lru(osdc, osd);
1102 }
1103 
1104 static void __remove_osd_from_lru(struct ceph_osd *osd)
1105 {
1106         dout("__remove_osd_from_lru %p\n", osd);
1107         if (!list_empty(&osd->o_osd_lru))
1108                 list_del_init(&osd->o_osd_lru);
1109 }
1110 
1111 static void remove_old_osds(struct ceph_osd_client *osdc)
1112 {
1113         struct ceph_osd *osd, *nosd;
1114 
1115         dout("__remove_old_osds %p\n", osdc);
1116         mutex_lock(&osdc->request_mutex);
1117         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1118                 if (time_before(jiffies, osd->lru_ttl))
1119                         break;
1120                 remove_osd(osdc, osd);
1121         }
1122         mutex_unlock(&osdc->request_mutex);
1123 }
1124 
1125 /*
1126  * reset osd connect
1127  */
1128 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1129 {
1130         struct ceph_entity_addr *peer_addr;
1131 
1132         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1133         if (list_empty(&osd->o_requests) &&
1134             list_empty(&osd->o_linger_requests)) {
1135                 remove_osd(osdc, osd);
1136                 return -ENODEV;
1137         }
1138 
1139         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1140         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1141                         !ceph_con_opened(&osd->o_con)) {
1142                 struct ceph_osd_request *req;
1143 
1144                 dout("osd addr hasn't changed and connection never opened, "
1145                      "letting msgr retry\n");
1146                 /* touch each r_stamp for handle_timeout()'s benfit */
1147                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1148                         req->r_stamp = jiffies;
1149 
1150                 return -EAGAIN;
1151         }
1152 
1153         ceph_con_close(&osd->o_con);
1154         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1155         osd->o_incarnation++;
1156 
1157         return 0;
1158 }
1159 
1160 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1161 {
1162         struct rb_node **p = &osdc->osds.rb_node;
1163         struct rb_node *parent = NULL;
1164         struct ceph_osd *osd = NULL;
1165 
1166         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1167         while (*p) {
1168                 parent = *p;
1169                 osd = rb_entry(parent, struct ceph_osd, o_node);
1170                 if (new->o_osd < osd->o_osd)
1171                         p = &(*p)->rb_left;
1172                 else if (new->o_osd > osd->o_osd)
1173                         p = &(*p)->rb_right;
1174                 else
1175                         BUG();
1176         }
1177 
1178         rb_link_node(&new->o_node, parent, p);
1179         rb_insert_color(&new->o_node, &osdc->osds);
1180 }
1181 
1182 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1183 {
1184         struct ceph_osd *osd;
1185         struct rb_node *n = osdc->osds.rb_node;
1186 
1187         while (n) {
1188                 osd = rb_entry(n, struct ceph_osd, o_node);
1189                 if (o < osd->o_osd)
1190                         n = n->rb_left;
1191                 else if (o > osd->o_osd)
1192                         n = n->rb_right;
1193                 else
1194                         return osd;
1195         }
1196         return NULL;
1197 }
1198 
1199 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1200 {
1201         schedule_delayed_work(&osdc->timeout_work,
1202                         osdc->client->options->osd_keepalive_timeout * HZ);
1203 }
1204 
1205 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1206 {
1207         cancel_delayed_work(&osdc->timeout_work);
1208 }
1209 
1210 /*
1211  * Register request, assign tid.  If this is the first request, set up
1212  * the timeout event.
1213  */
1214 static void __register_request(struct ceph_osd_client *osdc,
1215                                struct ceph_osd_request *req)
1216 {
1217         req->r_tid = ++osdc->last_tid;
1218         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1219         dout("__register_request %p tid %lld\n", req, req->r_tid);
1220         __insert_request(osdc, req);
1221         ceph_osdc_get_request(req);
1222         osdc->num_requests++;
1223         if (osdc->num_requests == 1) {
1224                 dout(" first request, scheduling timeout\n");
1225                 __schedule_osd_timeout(osdc);
1226         }
1227 }
1228 
1229 /*
1230  * called under osdc->request_mutex
1231  */
1232 static void __unregister_request(struct ceph_osd_client *osdc,
1233                                  struct ceph_osd_request *req)
1234 {
1235         if (RB_EMPTY_NODE(&req->r_node)) {
1236                 dout("__unregister_request %p tid %lld not registered\n",
1237                         req, req->r_tid);
1238                 return;
1239         }
1240 
1241         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1242         rb_erase(&req->r_node, &osdc->requests);
1243         RB_CLEAR_NODE(&req->r_node);
1244         osdc->num_requests--;
1245 
1246         if (req->r_osd) {
1247                 /* make sure the original request isn't in flight. */
1248                 ceph_msg_revoke(req->r_request);
1249 
1250                 list_del_init(&req->r_osd_item);
1251                 maybe_move_osd_to_lru(osdc, req->r_osd);
1252                 if (list_empty(&req->r_linger_osd_item))
1253                         req->r_osd = NULL;
1254         }
1255 
1256         list_del_init(&req->r_req_lru_item);
1257         ceph_osdc_put_request(req);
1258 
1259         if (osdc->num_requests == 0) {
1260                 dout(" no requests, canceling timeout\n");
1261                 __cancel_osd_timeout(osdc);
1262         }
1263 }
1264 
1265 /*
1266  * Cancel a previously queued request message
1267  */
1268 static void __cancel_request(struct ceph_osd_request *req)
1269 {
1270         if (req->r_sent && req->r_osd) {
1271                 ceph_msg_revoke(req->r_request);
1272                 req->r_sent = 0;
1273         }
1274 }
1275 
1276 static void __register_linger_request(struct ceph_osd_client *osdc,
1277                                     struct ceph_osd_request *req)
1278 {
1279         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1280         WARN_ON(!req->r_linger);
1281 
1282         ceph_osdc_get_request(req);
1283         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1284         if (req->r_osd)
1285                 list_add_tail(&req->r_linger_osd_item,
1286                               &req->r_osd->o_linger_requests);
1287 }
1288 
1289 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1290                                         struct ceph_osd_request *req)
1291 {
1292         WARN_ON(!req->r_linger);
1293 
1294         if (list_empty(&req->r_linger_item)) {
1295                 dout("%s %p tid %llu not registered\n", __func__, req,
1296                      req->r_tid);
1297                 return;
1298         }
1299 
1300         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1301         list_del_init(&req->r_linger_item);
1302 
1303         if (req->r_osd) {
1304                 list_del_init(&req->r_linger_osd_item);
1305                 maybe_move_osd_to_lru(osdc, req->r_osd);
1306                 if (list_empty(&req->r_osd_item))
1307                         req->r_osd = NULL;
1308         }
1309         ceph_osdc_put_request(req);
1310 }
1311 
1312 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1313                                   struct ceph_osd_request *req)
1314 {
1315         if (!req->r_linger) {
1316                 dout("set_request_linger %p\n", req);
1317                 req->r_linger = 1;
1318         }
1319 }
1320 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1321 
1322 /*
1323  * Returns whether a request should be blocked from being sent
1324  * based on the current osdmap and osd_client settings.
1325  *
1326  * Caller should hold map_sem for read.
1327  */
1328 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1329                                    struct ceph_osd_request *req)
1330 {
1331         bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1332         bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1333                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1334         return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1335                 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1336 }
1337 
1338 /*
1339  * Calculate mapping of a request to a PG.  Takes tiering into account.
1340  */
1341 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1342                              struct ceph_osd_request *req,
1343                              struct ceph_pg *pg_out)
1344 {
1345         bool need_check_tiering;
1346 
1347         need_check_tiering = false;
1348         if (req->r_target_oloc.pool == -1) {
1349                 req->r_target_oloc = req->r_base_oloc; /* struct */
1350                 need_check_tiering = true;
1351         }
1352         if (req->r_target_oid.name_len == 0) {
1353                 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1354                 need_check_tiering = true;
1355         }
1356 
1357         if (need_check_tiering &&
1358             (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1359                 struct ceph_pg_pool_info *pi;
1360 
1361                 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1362                 if (pi) {
1363                         if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1364                             pi->read_tier >= 0)
1365                                 req->r_target_oloc.pool = pi->read_tier;
1366                         if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1367                             pi->write_tier >= 0)
1368                                 req->r_target_oloc.pool = pi->write_tier;
1369                 }
1370                 /* !pi is caught in ceph_oloc_oid_to_pg() */
1371         }
1372 
1373         return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1374                                    &req->r_target_oid, pg_out);
1375 }
1376 
1377 static void __enqueue_request(struct ceph_osd_request *req)
1378 {
1379         struct ceph_osd_client *osdc = req->r_osdc;
1380 
1381         dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1382              req->r_osd ? req->r_osd->o_osd : -1);
1383 
1384         if (req->r_osd) {
1385                 __remove_osd_from_lru(req->r_osd);
1386                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1387                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1388         } else {
1389                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1390         }
1391 }
1392 
1393 /*
1394  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1395  * (as needed), and set the request r_osd appropriately.  If there is
1396  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1397  * (unsent, homeless) or leave on in-flight lru.
1398  *
1399  * Return 0 if unchanged, 1 if changed, or negative on error.
1400  *
1401  * Caller should hold map_sem for read and request_mutex.
1402  */
1403 static int __map_request(struct ceph_osd_client *osdc,
1404                          struct ceph_osd_request *req, int force_resend)
1405 {
1406         struct ceph_pg pgid;
1407         int acting[CEPH_PG_MAX_SIZE];
1408         int num, o;
1409         int err;
1410         bool was_paused;
1411 
1412         dout("map_request %p tid %lld\n", req, req->r_tid);
1413 
1414         err = __calc_request_pg(osdc->osdmap, req, &pgid);
1415         if (err) {
1416                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1417                 return err;
1418         }
1419         req->r_pgid = pgid;
1420 
1421         num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1422         if (num < 0)
1423                 num = 0;
1424 
1425         was_paused = req->r_paused;
1426         req->r_paused = __req_should_be_paused(osdc, req);
1427         if (was_paused && !req->r_paused)
1428                 force_resend = 1;
1429 
1430         if ((!force_resend &&
1431              req->r_osd && req->r_osd->o_osd == o &&
1432              req->r_sent >= req->r_osd->o_incarnation &&
1433              req->r_num_pg_osds == num &&
1434              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1435             (req->r_osd == NULL && o == -1) ||
1436             req->r_paused)
1437                 return 0;  /* no change */
1438 
1439         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1440              req->r_tid, pgid.pool, pgid.seed, o,
1441              req->r_osd ? req->r_osd->o_osd : -1);
1442 
1443         /* record full pg acting set */
1444         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1445         req->r_num_pg_osds = num;
1446 
1447         if (req->r_osd) {
1448                 __cancel_request(req);
1449                 list_del_init(&req->r_osd_item);
1450                 list_del_init(&req->r_linger_osd_item);
1451                 req->r_osd = NULL;
1452         }
1453 
1454         req->r_osd = __lookup_osd(osdc, o);
1455         if (!req->r_osd && o >= 0) {
1456                 err = -ENOMEM;
1457                 req->r_osd = create_osd(osdc, o);
1458                 if (!req->r_osd) {
1459                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1460                         goto out;
1461                 }
1462 
1463                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1464                 __insert_osd(osdc, req->r_osd);
1465 
1466                 ceph_con_open(&req->r_osd->o_con,
1467                               CEPH_ENTITY_TYPE_OSD, o,
1468                               &osdc->osdmap->osd_addr[o]);
1469         }
1470 
1471         __enqueue_request(req);
1472         err = 1;   /* osd or pg changed */
1473 
1474 out:
1475         return err;
1476 }
1477 
1478 /*
1479  * caller should hold map_sem (for read) and request_mutex
1480  */
1481 static void __send_request(struct ceph_osd_client *osdc,
1482                            struct ceph_osd_request *req)
1483 {
1484         void *p;
1485 
1486         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1487              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1488              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1489 
1490         /* fill in message content that changes each time we send it */
1491         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1492         put_unaligned_le32(req->r_flags, req->r_request_flags);
1493         put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1494         p = req->r_request_pgid;
1495         ceph_encode_64(&p, req->r_pgid.pool);
1496         ceph_encode_32(&p, req->r_pgid.seed);
1497         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1498         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1499                sizeof(req->r_reassert_version));
1500 
1501         req->r_stamp = jiffies;
1502         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1503 
1504         ceph_msg_get(req->r_request); /* send consumes a ref */
1505 
1506         req->r_sent = req->r_osd->o_incarnation;
1507 
1508         ceph_con_send(&req->r_osd->o_con, req->r_request);
1509 }
1510 
1511 /*
1512  * Send any requests in the queue (req_unsent).
1513  */
1514 static void __send_queued(struct ceph_osd_client *osdc)
1515 {
1516         struct ceph_osd_request *req, *tmp;
1517 
1518         dout("__send_queued\n");
1519         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1520                 __send_request(osdc, req);
1521 }
1522 
1523 /*
1524  * Caller should hold map_sem for read and request_mutex.
1525  */
1526 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1527                                      struct ceph_osd_request *req,
1528                                      bool nofail)
1529 {
1530         int rc;
1531 
1532         __register_request(osdc, req);
1533         req->r_sent = 0;
1534         req->r_got_reply = 0;
1535         rc = __map_request(osdc, req, 0);
1536         if (rc < 0) {
1537                 if (nofail) {
1538                         dout("osdc_start_request failed map, "
1539                                 " will retry %lld\n", req->r_tid);
1540                         rc = 0;
1541                 } else {
1542                         __unregister_request(osdc, req);
1543                 }
1544                 return rc;
1545         }
1546 
1547         if (req->r_osd == NULL) {
1548                 dout("send_request %p no up osds in pg\n", req);
1549                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1550         } else {
1551                 __send_queued(osdc);
1552         }
1553 
1554         return 0;
1555 }
1556 
1557 /*
1558  * Timeout callback, called every N seconds when 1 or more osd
1559  * requests has been active for more than N seconds.  When this
1560  * happens, we ping all OSDs with requests who have timed out to
1561  * ensure any communications channel reset is detected.  Reset the
1562  * request timeouts another N seconds in the future as we go.
1563  * Reschedule the timeout event another N seconds in future (unless
1564  * there are no open requests).
1565  */
1566 static void handle_timeout(struct work_struct *work)
1567 {
1568         struct ceph_osd_client *osdc =
1569                 container_of(work, struct ceph_osd_client, timeout_work.work);
1570         struct ceph_osd_request *req;
1571         struct ceph_osd *osd;
1572         unsigned long keepalive =
1573                 osdc->client->options->osd_keepalive_timeout * HZ;
1574         struct list_head slow_osds;
1575         dout("timeout\n");
1576         down_read(&osdc->map_sem);
1577 
1578         ceph_monc_request_next_osdmap(&osdc->client->monc);
1579 
1580         mutex_lock(&osdc->request_mutex);
1581 
1582         /*
1583          * ping osds that are a bit slow.  this ensures that if there
1584          * is a break in the TCP connection we will notice, and reopen
1585          * a connection with that osd (from the fault callback).
1586          */
1587         INIT_LIST_HEAD(&slow_osds);
1588         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1589                 if (time_before(jiffies, req->r_stamp + keepalive))
1590                         break;
1591 
1592                 osd = req->r_osd;
1593                 BUG_ON(!osd);
1594                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1595                      req->r_tid, osd->o_osd);
1596                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1597         }
1598         while (!list_empty(&slow_osds)) {
1599                 osd = list_entry(slow_osds.next, struct ceph_osd,
1600                                  o_keepalive_item);
1601                 list_del_init(&osd->o_keepalive_item);
1602                 ceph_con_keepalive(&osd->o_con);
1603         }
1604 
1605         __schedule_osd_timeout(osdc);
1606         __send_queued(osdc);
1607         mutex_unlock(&osdc->request_mutex);
1608         up_read(&osdc->map_sem);
1609 }
1610 
1611 static void handle_osds_timeout(struct work_struct *work)
1612 {
1613         struct ceph_osd_client *osdc =
1614                 container_of(work, struct ceph_osd_client,
1615                              osds_timeout_work.work);
1616         unsigned long delay =
1617                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1618 
1619         dout("osds timeout\n");
1620         down_read(&osdc->map_sem);
1621         remove_old_osds(osdc);
1622         up_read(&osdc->map_sem);
1623 
1624         schedule_delayed_work(&osdc->osds_timeout_work,
1625                               round_jiffies_relative(delay));
1626 }
1627 
1628 static int ceph_oloc_decode(void **p, void *end,
1629                             struct ceph_object_locator *oloc)
1630 {
1631         u8 struct_v, struct_cv;
1632         u32 len;
1633         void *struct_end;
1634         int ret = 0;
1635 
1636         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1637         struct_v = ceph_decode_8(p);
1638         struct_cv = ceph_decode_8(p);
1639         if (struct_v < 3) {
1640                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1641                         struct_v, struct_cv);
1642                 goto e_inval;
1643         }
1644         if (struct_cv > 6) {
1645                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1646                         struct_v, struct_cv);
1647                 goto e_inval;
1648         }
1649         len = ceph_decode_32(p);
1650         ceph_decode_need(p, end, len, e_inval);
1651         struct_end = *p + len;
1652 
1653         oloc->pool = ceph_decode_64(p);
1654         *p += 4; /* skip preferred */
1655 
1656         len = ceph_decode_32(p);
1657         if (len > 0) {
1658                 pr_warn("ceph_object_locator::key is set\n");
1659                 goto e_inval;
1660         }
1661 
1662         if (struct_v >= 5) {
1663                 len = ceph_decode_32(p);
1664                 if (len > 0) {
1665                         pr_warn("ceph_object_locator::nspace is set\n");
1666                         goto e_inval;
1667                 }
1668         }
1669 
1670         if (struct_v >= 6) {
1671                 s64 hash = ceph_decode_64(p);
1672                 if (hash != -1) {
1673                         pr_warn("ceph_object_locator::hash is set\n");
1674                         goto e_inval;
1675                 }
1676         }
1677 
1678         /* skip the rest */
1679         *p = struct_end;
1680 out:
1681         return ret;
1682 
1683 e_inval:
1684         ret = -EINVAL;
1685         goto out;
1686 }
1687 
1688 static int ceph_redirect_decode(void **p, void *end,
1689                                 struct ceph_request_redirect *redir)
1690 {
1691         u8 struct_v, struct_cv;
1692         u32 len;
1693         void *struct_end;
1694         int ret;
1695 
1696         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1697         struct_v = ceph_decode_8(p);
1698         struct_cv = ceph_decode_8(p);
1699         if (struct_cv > 1) {
1700                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1701                         struct_v, struct_cv);
1702                 goto e_inval;
1703         }
1704         len = ceph_decode_32(p);
1705         ceph_decode_need(p, end, len, e_inval);
1706         struct_end = *p + len;
1707 
1708         ret = ceph_oloc_decode(p, end, &redir->oloc);
1709         if (ret)
1710                 goto out;
1711 
1712         len = ceph_decode_32(p);
1713         if (len > 0) {
1714                 pr_warn("ceph_request_redirect::object_name is set\n");
1715                 goto e_inval;
1716         }
1717 
1718         len = ceph_decode_32(p);
1719         *p += len; /* skip osd_instructions */
1720 
1721         /* skip the rest */
1722         *p = struct_end;
1723 out:
1724         return ret;
1725 
1726 e_inval:
1727         ret = -EINVAL;
1728         goto out;
1729 }
1730 
1731 static void complete_request(struct ceph_osd_request *req)
1732 {
1733         complete_all(&req->r_safe_completion);  /* fsync waiter */
1734 }
1735 
1736 /*
1737  * handle osd op reply.  either call the callback if it is specified,
1738  * or do the completion to wake up the waiting thread.
1739  */
1740 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1741                          struct ceph_connection *con)
1742 {
1743         void *p, *end;
1744         struct ceph_osd_request *req;
1745         struct ceph_request_redirect redir;
1746         u64 tid;
1747         int object_len;
1748         unsigned int numops;
1749         int payload_len, flags;
1750         s32 result;
1751         s32 retry_attempt;
1752         struct ceph_pg pg;
1753         int err;
1754         u32 reassert_epoch;
1755         u64 reassert_version;
1756         u32 osdmap_epoch;
1757         int already_completed;
1758         u32 bytes;
1759         unsigned int i;
1760 
1761         tid = le64_to_cpu(msg->hdr.tid);
1762         dout("handle_reply %p tid %llu\n", msg, tid);
1763 
1764         p = msg->front.iov_base;
1765         end = p + msg->front.iov_len;
1766 
1767         ceph_decode_need(&p, end, 4, bad);
1768         object_len = ceph_decode_32(&p);
1769         ceph_decode_need(&p, end, object_len, bad);
1770         p += object_len;
1771 
1772         err = ceph_decode_pgid(&p, end, &pg);
1773         if (err)
1774                 goto bad;
1775 
1776         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1777         flags = ceph_decode_64(&p);
1778         result = ceph_decode_32(&p);
1779         reassert_epoch = ceph_decode_32(&p);
1780         reassert_version = ceph_decode_64(&p);
1781         osdmap_epoch = ceph_decode_32(&p);
1782 
1783         /* lookup */
1784         down_read(&osdc->map_sem);
1785         mutex_lock(&osdc->request_mutex);
1786         req = __lookup_request(osdc, tid);
1787         if (req == NULL) {
1788                 dout("handle_reply tid %llu dne\n", tid);
1789                 goto bad_mutex;
1790         }
1791         ceph_osdc_get_request(req);
1792 
1793         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1794              req, result);
1795 
1796         ceph_decode_need(&p, end, 4, bad_put);
1797         numops = ceph_decode_32(&p);
1798         if (numops > CEPH_OSD_MAX_OP)
1799                 goto bad_put;
1800         if (numops != req->r_num_ops)
1801                 goto bad_put;
1802         payload_len = 0;
1803         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1804         for (i = 0; i < numops; i++) {
1805                 struct ceph_osd_op *op = p;
1806                 int len;
1807 
1808                 len = le32_to_cpu(op->payload_len);
1809                 req->r_reply_op_len[i] = len;
1810                 dout(" op %d has %d bytes\n", i, len);
1811                 payload_len += len;
1812                 p += sizeof(*op);
1813         }
1814         bytes = le32_to_cpu(msg->hdr.data_len);
1815         if (payload_len != bytes) {
1816                 pr_warn("sum of op payload lens %d != data_len %d\n",
1817                         payload_len, bytes);
1818                 goto bad_put;
1819         }
1820 
1821         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1822         retry_attempt = ceph_decode_32(&p);
1823         for (i = 0; i < numops; i++)
1824                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1825 
1826         if (le16_to_cpu(msg->hdr.version) >= 6) {
1827                 p += 8 + 4; /* skip replay_version */
1828                 p += 8; /* skip user_version */
1829 
1830                 err = ceph_redirect_decode(&p, end, &redir);
1831                 if (err)
1832                         goto bad_put;
1833         } else {
1834                 redir.oloc.pool = -1;
1835         }
1836 
1837         if (redir.oloc.pool != -1) {
1838                 dout("redirect pool %lld\n", redir.oloc.pool);
1839 
1840                 __unregister_request(osdc, req);
1841 
1842                 req->r_target_oloc = redir.oloc; /* struct */
1843 
1844                 /*
1845                  * Start redirect requests with nofail=true.  If
1846                  * mapping fails, request will end up on the notarget
1847                  * list, waiting for the new osdmap (which can take
1848                  * a while), even though the original request mapped
1849                  * successfully.  In the future we might want to follow
1850                  * original request's nofail setting here.
1851                  */
1852                 err = __ceph_osdc_start_request(osdc, req, true);
1853                 BUG_ON(err);
1854 
1855                 goto out_unlock;
1856         }
1857 
1858         already_completed = req->r_got_reply;
1859         if (!req->r_got_reply) {
1860                 req->r_result = result;
1861                 dout("handle_reply result %d bytes %d\n", req->r_result,
1862                      bytes);
1863                 if (req->r_result == 0)
1864                         req->r_result = bytes;
1865 
1866                 /* in case this is a write and we need to replay, */
1867                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1868                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1869 
1870                 req->r_got_reply = 1;
1871         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1872                 dout("handle_reply tid %llu dup ack\n", tid);
1873                 goto out_unlock;
1874         }
1875 
1876         dout("handle_reply tid %llu flags %d\n", tid, flags);
1877 
1878         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1879                 __register_linger_request(osdc, req);
1880 
1881         /* either this is a read, or we got the safe response */
1882         if (result < 0 ||
1883             (flags & CEPH_OSD_FLAG_ONDISK) ||
1884             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1885                 __unregister_request(osdc, req);
1886 
1887         mutex_unlock(&osdc->request_mutex);
1888         up_read(&osdc->map_sem);
1889 
1890         if (!already_completed) {
1891                 if (req->r_unsafe_callback &&
1892                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1893                         req->r_unsafe_callback(req, true);
1894                 if (req->r_callback)
1895                         req->r_callback(req, msg);
1896                 else
1897                         complete_all(&req->r_completion);
1898         }
1899 
1900         if (flags & CEPH_OSD_FLAG_ONDISK) {
1901                 if (req->r_unsafe_callback && already_completed)
1902                         req->r_unsafe_callback(req, false);
1903                 complete_request(req);
1904         }
1905 
1906 out:
1907         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1908         ceph_osdc_put_request(req);
1909         return;
1910 out_unlock:
1911         mutex_unlock(&osdc->request_mutex);
1912         up_read(&osdc->map_sem);
1913         goto out;
1914 
1915 bad_put:
1916         req->r_result = -EIO;
1917         __unregister_request(osdc, req);
1918         if (req->r_callback)
1919                 req->r_callback(req, msg);
1920         else
1921                 complete_all(&req->r_completion);
1922         complete_request(req);
1923         ceph_osdc_put_request(req);
1924 bad_mutex:
1925         mutex_unlock(&osdc->request_mutex);
1926         up_read(&osdc->map_sem);
1927 bad:
1928         pr_err("corrupt osd_op_reply got %d %d\n",
1929                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1930         ceph_msg_dump(msg);
1931 }
1932 
1933 static void reset_changed_osds(struct ceph_osd_client *osdc)
1934 {
1935         struct rb_node *p, *n;
1936 
1937         dout("%s %p\n", __func__, osdc);
1938         for (p = rb_first(&osdc->osds); p; p = n) {
1939                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1940 
1941                 n = rb_next(p);
1942                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1943                     memcmp(&osd->o_con.peer_addr,
1944                            ceph_osd_addr(osdc->osdmap,
1945                                          osd->o_osd),
1946                            sizeof(struct ceph_entity_addr)) != 0)
1947                         __reset_osd(osdc, osd);
1948         }
1949 }
1950 
1951 /*
1952  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1953  * no osd, request a new map.
1954  *
1955  * Caller should hold map_sem for read.
1956  */
1957 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1958                           bool force_resend_writes)
1959 {
1960         struct ceph_osd_request *req, *nreq;
1961         struct rb_node *p;
1962         int needmap = 0;
1963         int err;
1964         bool force_resend_req;
1965 
1966         dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1967                 force_resend_writes ? " (force resend writes)" : "");
1968         mutex_lock(&osdc->request_mutex);
1969         for (p = rb_first(&osdc->requests); p; ) {
1970                 req = rb_entry(p, struct ceph_osd_request, r_node);
1971                 p = rb_next(p);
1972 
1973                 /*
1974                  * For linger requests that have not yet been
1975                  * registered, move them to the linger list; they'll
1976                  * be sent to the osd in the loop below.  Unregister
1977                  * the request before re-registering it as a linger
1978                  * request to ensure the __map_request() below
1979                  * will decide it needs to be sent.
1980                  */
1981                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1982                         dout("%p tid %llu restart on osd%d\n",
1983                              req, req->r_tid,
1984                              req->r_osd ? req->r_osd->o_osd : -1);
1985                         ceph_osdc_get_request(req);
1986                         __unregister_request(osdc, req);
1987                         __register_linger_request(osdc, req);
1988                         ceph_osdc_put_request(req);
1989                         continue;
1990                 }
1991 
1992                 force_resend_req = force_resend ||
1993                         (force_resend_writes &&
1994                                 req->r_flags & CEPH_OSD_FLAG_WRITE);
1995                 err = __map_request(osdc, req, force_resend_req);
1996                 if (err < 0)
1997                         continue;  /* error */
1998                 if (req->r_osd == NULL) {
1999                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2000                         needmap++;  /* request a newer map */
2001                 } else if (err > 0) {
2002                         if (!req->r_linger) {
2003                                 dout("%p tid %llu requeued on osd%d\n", req,
2004                                      req->r_tid,
2005                                      req->r_osd ? req->r_osd->o_osd : -1);
2006                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2007                         }
2008                 }
2009         }
2010 
2011         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2012                                  r_linger_item) {
2013                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2014 
2015                 err = __map_request(osdc, req,
2016                                     force_resend || force_resend_writes);
2017                 dout("__map_request returned %d\n", err);
2018                 if (err < 0)
2019                         continue;  /* hrm! */
2020                 if (req->r_osd == NULL || err > 0) {
2021                         if (req->r_osd == NULL) {
2022                                 dout("lingering %p tid %llu maps to no osd\n",
2023                                      req, req->r_tid);
2024                                 /*
2025                                  * A homeless lingering request makes
2026                                  * no sense, as it's job is to keep
2027                                  * a particular OSD connection open.
2028                                  * Request a newer map and kick the
2029                                  * request, knowing that it won't be
2030                                  * resent until we actually get a map
2031                                  * that can tell us where to send it.
2032                                  */
2033                                 needmap++;
2034                         }
2035 
2036                         dout("kicking lingering %p tid %llu osd%d\n", req,
2037                              req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2038                         __register_request(osdc, req);
2039                         __unregister_linger_request(osdc, req);
2040                 }
2041         }
2042         reset_changed_osds(osdc);
2043         mutex_unlock(&osdc->request_mutex);
2044 
2045         if (needmap) {
2046                 dout("%d requests for down osds, need new map\n", needmap);
2047                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2048         }
2049 }
2050 
2051 
2052 /*
2053  * Process updated osd map.
2054  *
2055  * The message contains any number of incremental and full maps, normally
2056  * indicating some sort of topology change in the cluster.  Kick requests
2057  * off to different OSDs as needed.
2058  */
2059 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2060 {
2061         void *p, *end, *next;
2062         u32 nr_maps, maplen;
2063         u32 epoch;
2064         struct ceph_osdmap *newmap = NULL, *oldmap;
2065         int err;
2066         struct ceph_fsid fsid;
2067         bool was_full;
2068 
2069         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2070         p = msg->front.iov_base;
2071         end = p + msg->front.iov_len;
2072 
2073         /* verify fsid */
2074         ceph_decode_need(&p, end, sizeof(fsid), bad);
2075         ceph_decode_copy(&p, &fsid, sizeof(fsid));
2076         if (ceph_check_fsid(osdc->client, &fsid) < 0)
2077                 return;
2078 
2079         down_write(&osdc->map_sem);
2080 
2081         was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2082 
2083         /* incremental maps */
2084         ceph_decode_32_safe(&p, end, nr_maps, bad);
2085         dout(" %d inc maps\n", nr_maps);
2086         while (nr_maps > 0) {
2087                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2088                 epoch = ceph_decode_32(&p);
2089                 maplen = ceph_decode_32(&p);
2090                 ceph_decode_need(&p, end, maplen, bad);
2091                 next = p + maplen;
2092                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2093                         dout("applying incremental map %u len %d\n",
2094                              epoch, maplen);
2095                         newmap = osdmap_apply_incremental(&p, next,
2096                                                           osdc->osdmap,
2097                                                           &osdc->client->msgr);
2098                         if (IS_ERR(newmap)) {
2099                                 err = PTR_ERR(newmap);
2100                                 goto bad;
2101                         }
2102                         BUG_ON(!newmap);
2103                         if (newmap != osdc->osdmap) {
2104                                 ceph_osdmap_destroy(osdc->osdmap);
2105                                 osdc->osdmap = newmap;
2106                         }
2107                         was_full = was_full ||
2108                                 ceph_osdmap_flag(osdc->osdmap,
2109                                                  CEPH_OSDMAP_FULL);
2110                         kick_requests(osdc, 0, was_full);
2111                 } else {
2112                         dout("ignoring incremental map %u len %d\n",
2113                              epoch, maplen);
2114                 }
2115                 p = next;
2116                 nr_maps--;
2117         }
2118         if (newmap)
2119                 goto done;
2120 
2121         /* full maps */
2122         ceph_decode_32_safe(&p, end, nr_maps, bad);
2123         dout(" %d full maps\n", nr_maps);
2124         while (nr_maps) {
2125                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2126                 epoch = ceph_decode_32(&p);
2127                 maplen = ceph_decode_32(&p);
2128                 ceph_decode_need(&p, end, maplen, bad);
2129                 if (nr_maps > 1) {
2130                         dout("skipping non-latest full map %u len %d\n",
2131                              epoch, maplen);
2132                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2133                         dout("skipping full map %u len %d, "
2134                              "older than our %u\n", epoch, maplen,
2135                              osdc->osdmap->epoch);
2136                 } else {
2137                         int skipped_map = 0;
2138 
2139                         dout("taking full map %u len %d\n", epoch, maplen);
2140                         newmap = ceph_osdmap_decode(&p, p+maplen);
2141                         if (IS_ERR(newmap)) {
2142                                 err = PTR_ERR(newmap);
2143                                 goto bad;
2144                         }
2145                         BUG_ON(!newmap);
2146                         oldmap = osdc->osdmap;
2147                         osdc->osdmap = newmap;
2148                         if (oldmap) {
2149                                 if (oldmap->epoch + 1 < newmap->epoch)
2150                                         skipped_map = 1;
2151                                 ceph_osdmap_destroy(oldmap);
2152                         }
2153                         was_full = was_full ||
2154                                 ceph_osdmap_flag(osdc->osdmap,
2155                                                  CEPH_OSDMAP_FULL);
2156                         kick_requests(osdc, skipped_map, was_full);
2157                 }
2158                 p += maplen;
2159                 nr_maps--;
2160         }
2161 
2162         if (!osdc->osdmap)
2163                 goto bad;
2164 done:
2165         downgrade_write(&osdc->map_sem);
2166         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2167 
2168         /*
2169          * subscribe to subsequent osdmap updates if full to ensure
2170          * we find out when we are no longer full and stop returning
2171          * ENOSPC.
2172          */
2173         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2174                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2175                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2176                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2177 
2178         mutex_lock(&osdc->request_mutex);
2179         __send_queued(osdc);
2180         mutex_unlock(&osdc->request_mutex);
2181         up_read(&osdc->map_sem);
2182         wake_up_all(&osdc->client->auth_wq);
2183         return;
2184 
2185 bad:
2186         pr_err("osdc handle_map corrupt msg\n");
2187         ceph_msg_dump(msg);
2188         up_write(&osdc->map_sem);
2189 }
2190 
2191 /*
2192  * watch/notify callback event infrastructure
2193  *
2194  * These callbacks are used both for watch and notify operations.
2195  */
2196 static void __release_event(struct kref *kref)
2197 {
2198         struct ceph_osd_event *event =
2199                 container_of(kref, struct ceph_osd_event, kref);
2200 
2201         dout("__release_event %p\n", event);
2202         kfree(event);
2203 }
2204 
2205 static void get_event(struct ceph_osd_event *event)
2206 {
2207         kref_get(&event->kref);
2208 }
2209 
2210 void ceph_osdc_put_event(struct ceph_osd_event *event)
2211 {
2212         kref_put(&event->kref, __release_event);
2213 }
2214 EXPORT_SYMBOL(ceph_osdc_put_event);
2215 
2216 static void __insert_event(struct ceph_osd_client *osdc,
2217                              struct ceph_osd_event *new)
2218 {
2219         struct rb_node **p = &osdc->event_tree.rb_node;
2220         struct rb_node *parent = NULL;
2221         struct ceph_osd_event *event = NULL;
2222 
2223         while (*p) {
2224                 parent = *p;
2225                 event = rb_entry(parent, struct ceph_osd_event, node);
2226                 if (new->cookie < event->cookie)
2227                         p = &(*p)->rb_left;
2228                 else if (new->cookie > event->cookie)
2229                         p = &(*p)->rb_right;
2230                 else
2231                         BUG();
2232         }
2233 
2234         rb_link_node(&new->node, parent, p);
2235         rb_insert_color(&new->node, &osdc->event_tree);
2236 }
2237 
2238 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2239                                                 u64 cookie)
2240 {
2241         struct rb_node **p = &osdc->event_tree.rb_node;
2242         struct rb_node *parent = NULL;
2243         struct ceph_osd_event *event = NULL;
2244 
2245         while (*p) {
2246                 parent = *p;
2247                 event = rb_entry(parent, struct ceph_osd_event, node);
2248                 if (cookie < event->cookie)
2249                         p = &(*p)->rb_left;
2250                 else if (cookie > event->cookie)
2251                         p = &(*p)->rb_right;
2252                 else
2253                         return event;
2254         }
2255         return NULL;
2256 }
2257 
2258 static void __remove_event(struct ceph_osd_event *event)
2259 {
2260         struct ceph_osd_client *osdc = event->osdc;
2261 
2262         if (!RB_EMPTY_NODE(&event->node)) {
2263                 dout("__remove_event removed %p\n", event);
2264                 rb_erase(&event->node, &osdc->event_tree);
2265                 ceph_osdc_put_event(event);
2266         } else {
2267                 dout("__remove_event didn't remove %p\n", event);
2268         }
2269 }
2270 
2271 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2272                            void (*event_cb)(u64, u64, u8, void *),
2273                            void *data, struct ceph_osd_event **pevent)
2274 {
2275         struct ceph_osd_event *event;
2276 
2277         event = kmalloc(sizeof(*event), GFP_NOIO);
2278         if (!event)
2279                 return -ENOMEM;
2280 
2281         dout("create_event %p\n", event);
2282         event->cb = event_cb;
2283         event->one_shot = 0;
2284         event->data = data;
2285         event->osdc = osdc;
2286         INIT_LIST_HEAD(&event->osd_node);
2287         RB_CLEAR_NODE(&event->node);
2288         kref_init(&event->kref);   /* one ref for us */
2289         kref_get(&event->kref);    /* one ref for the caller */
2290 
2291         spin_lock(&osdc->event_lock);
2292         event->cookie = ++osdc->event_count;
2293         __insert_event(osdc, event);
2294         spin_unlock(&osdc->event_lock);
2295 
2296         *pevent = event;
2297         return 0;
2298 }
2299 EXPORT_SYMBOL(ceph_osdc_create_event);
2300 
2301 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2302 {
2303         struct ceph_osd_client *osdc = event->osdc;
2304 
2305         dout("cancel_event %p\n", event);
2306         spin_lock(&osdc->event_lock);
2307         __remove_event(event);
2308         spin_unlock(&osdc->event_lock);
2309         ceph_osdc_put_event(event); /* caller's */
2310 }
2311 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2312 
2313 
2314 static void do_event_work(struct work_struct *work)
2315 {
2316         struct ceph_osd_event_work *event_work =
2317                 container_of(work, struct ceph_osd_event_work, work);
2318         struct ceph_osd_event *event = event_work->event;
2319         u64 ver = event_work->ver;
2320         u64 notify_id = event_work->notify_id;
2321         u8 opcode = event_work->opcode;
2322 
2323         dout("do_event_work completing %p\n", event);
2324         event->cb(ver, notify_id, opcode, event->data);
2325         dout("do_event_work completed %p\n", event);
2326         ceph_osdc_put_event(event);
2327         kfree(event_work);
2328 }
2329 
2330 
2331 /*
2332  * Process osd watch notifications
2333  */
2334 static void handle_watch_notify(struct ceph_osd_client *osdc,
2335                                 struct ceph_msg *msg)
2336 {
2337         void *p, *end;
2338         u8 proto_ver;
2339         u64 cookie, ver, notify_id;
2340         u8 opcode;
2341         struct ceph_osd_event *event;
2342         struct ceph_osd_event_work *event_work;
2343 
2344         p = msg->front.iov_base;
2345         end = p + msg->front.iov_len;
2346 
2347         ceph_decode_8_safe(&p, end, proto_ver, bad);
2348         ceph_decode_8_safe(&p, end, opcode, bad);
2349         ceph_decode_64_safe(&p, end, cookie, bad);
2350         ceph_decode_64_safe(&p, end, ver, bad);
2351         ceph_decode_64_safe(&p, end, notify_id, bad);
2352 
2353         spin_lock(&osdc->event_lock);
2354         event = __find_event(osdc, cookie);
2355         if (event) {
2356                 BUG_ON(event->one_shot);
2357                 get_event(event);
2358         }
2359         spin_unlock(&osdc->event_lock);
2360         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2361              cookie, ver, event);
2362         if (event) {
2363                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2364                 if (!event_work) {
2365                         pr_err("couldn't allocate event_work\n");
2366                         ceph_osdc_put_event(event);
2367                         return;
2368                 }
2369                 INIT_WORK(&event_work->work, do_event_work);
2370                 event_work->event = event;
2371                 event_work->ver = ver;
2372                 event_work->notify_id = notify_id;
2373                 event_work->opcode = opcode;
2374 
2375                 queue_work(osdc->notify_wq, &event_work->work);
2376         }
2377 
2378         return;
2379 
2380 bad:
2381         pr_err("osdc handle_watch_notify corrupt msg\n");
2382 }
2383 
2384 /*
2385  * build new request AND message
2386  *
2387  */
2388 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2389                                 struct ceph_snap_context *snapc, u64 snap_id,
2390                                 struct timespec *mtime)
2391 {
2392         struct ceph_msg *msg = req->r_request;
2393         void *p;
2394         size_t msg_size;
2395         int flags = req->r_flags;
2396         u64 data_len;
2397         unsigned int i;
2398 
2399         req->r_snapid = snap_id;
2400         req->r_snapc = ceph_get_snap_context(snapc);
2401 
2402         /* encode request */
2403         msg->hdr.version = cpu_to_le16(4);
2404 
2405         p = msg->front.iov_base;
2406         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2407         req->r_request_osdmap_epoch = p;
2408         p += 4;
2409         req->r_request_flags = p;
2410         p += 4;
2411         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2412                 ceph_encode_timespec(p, mtime);
2413         p += sizeof(struct ceph_timespec);
2414         req->r_request_reassert_version = p;
2415         p += sizeof(struct ceph_eversion); /* will get filled in */
2416 
2417         /* oloc */
2418         ceph_encode_8(&p, 4);
2419         ceph_encode_8(&p, 4);
2420         ceph_encode_32(&p, 8 + 4 + 4);
2421         req->r_request_pool = p;
2422         p += 8;
2423         ceph_encode_32(&p, -1);  /* preferred */
2424         ceph_encode_32(&p, 0);   /* key len */
2425 
2426         ceph_encode_8(&p, 1);
2427         req->r_request_pgid = p;
2428         p += 8 + 4;
2429         ceph_encode_32(&p, -1);  /* preferred */
2430 
2431         /* oid */
2432         ceph_encode_32(&p, req->r_base_oid.name_len);
2433         memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2434         dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2435              req->r_base_oid.name, req->r_base_oid.name_len);
2436         p += req->r_base_oid.name_len;
2437 
2438         /* ops--can imply data */
2439         ceph_encode_16(&p, (u16)req->r_num_ops);
2440         data_len = 0;
2441         for (i = 0; i < req->r_num_ops; i++) {
2442                 data_len += osd_req_encode_op(req, p, i);
2443                 p += sizeof(struct ceph_osd_op);
2444         }
2445 
2446         /* snaps */
2447         ceph_encode_64(&p, req->r_snapid);
2448         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2449         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2450         if (req->r_snapc) {
2451                 for (i = 0; i < snapc->num_snaps; i++) {
2452                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2453                 }
2454         }
2455 
2456         req->r_request_attempts = p;
2457         p += 4;
2458 
2459         /* data */
2460         if (flags & CEPH_OSD_FLAG_WRITE) {
2461                 u16 data_off;
2462 
2463                 /*
2464                  * The header "data_off" is a hint to the receiver
2465                  * allowing it to align received data into its
2466                  * buffers such that there's no need to re-copy
2467                  * it before writing it to disk (direct I/O).
2468                  */
2469                 data_off = (u16) (off & 0xffff);
2470                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2471         }
2472         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2473 
2474         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2475         msg_size = p - msg->front.iov_base;
2476         msg->front.iov_len = msg_size;
2477         msg->hdr.front_len = cpu_to_le32(msg_size);
2478 
2479         dout("build_request msg_size was %d\n", (int)msg_size);
2480 }
2481 EXPORT_SYMBOL(ceph_osdc_build_request);
2482 
2483 /*
2484  * Register request, send initial attempt.
2485  */
2486 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2487                             struct ceph_osd_request *req,
2488                             bool nofail)
2489 {
2490         int rc;
2491 
2492         down_read(&osdc->map_sem);
2493         mutex_lock(&osdc->request_mutex);
2494 
2495         rc = __ceph_osdc_start_request(osdc, req, nofail);
2496 
2497         mutex_unlock(&osdc->request_mutex);
2498         up_read(&osdc->map_sem);
2499 
2500         return rc;
2501 }
2502 EXPORT_SYMBOL(ceph_osdc_start_request);
2503 
2504 /*
2505  * Unregister a registered request.  The request is not completed (i.e.
2506  * no callbacks or wakeups) - higher layers are supposed to know what
2507  * they are canceling.
2508  */
2509 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2510 {
2511         struct ceph_osd_client *osdc = req->r_osdc;
2512 
2513         mutex_lock(&osdc->request_mutex);
2514         if (req->r_linger)
2515                 __unregister_linger_request(osdc, req);
2516         __unregister_request(osdc, req);
2517         mutex_unlock(&osdc->request_mutex);
2518 
2519         dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2520 }
2521 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2522 
2523 /*
2524  * wait for a request to complete
2525  */
2526 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2527                            struct ceph_osd_request *req)
2528 {
2529         int rc;
2530 
2531         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2532 
2533         rc = wait_for_completion_interruptible(&req->r_completion);
2534         if (rc < 0) {
2535                 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2536                 ceph_osdc_cancel_request(req);
2537                 complete_request(req);
2538                 return rc;
2539         }
2540 
2541         dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2542              req->r_result);
2543         return req->r_result;
2544 }
2545 EXPORT_SYMBOL(ceph_osdc_wait_request);
2546 
2547 /*
2548  * sync - wait for all in-flight requests to flush.  avoid starvation.
2549  */
2550 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2551 {
2552         struct ceph_osd_request *req;
2553         u64 last_tid, next_tid = 0;
2554 
2555         mutex_lock(&osdc->request_mutex);
2556         last_tid = osdc->last_tid;
2557         while (1) {
2558                 req = __lookup_request_ge(osdc, next_tid);
2559                 if (!req)
2560                         break;
2561                 if (req->r_tid > last_tid)
2562                         break;
2563 
2564                 next_tid = req->r_tid + 1;
2565                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2566                         continue;
2567 
2568                 ceph_osdc_get_request(req);
2569                 mutex_unlock(&osdc->request_mutex);
2570                 dout("sync waiting on tid %llu (last is %llu)\n",
2571                      req->r_tid, last_tid);
2572                 wait_for_completion(&req->r_safe_completion);
2573                 mutex_lock(&osdc->request_mutex);
2574                 ceph_osdc_put_request(req);
2575         }
2576         mutex_unlock(&osdc->request_mutex);
2577         dout("sync done (thru tid %llu)\n", last_tid);
2578 }
2579 EXPORT_SYMBOL(ceph_osdc_sync);
2580 
2581 /*
2582  * Call all pending notify callbacks - for use after a watch is
2583  * unregistered, to make sure no more callbacks for it will be invoked
2584  */
2585 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2586 {
2587         flush_workqueue(osdc->notify_wq);
2588 }
2589 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2590 
2591 
2592 /*
2593  * init, shutdown
2594  */
2595 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2596 {
2597         int err;
2598 
2599         dout("init\n");
2600         osdc->client = client;
2601         osdc->osdmap = NULL;
2602         init_rwsem(&osdc->map_sem);
2603         init_completion(&osdc->map_waiters);
2604         osdc->last_requested_map = 0;
2605         mutex_init(&osdc->request_mutex);
2606         osdc->last_tid = 0;
2607         osdc->osds = RB_ROOT;
2608         INIT_LIST_HEAD(&osdc->osd_lru);
2609         osdc->requests = RB_ROOT;
2610         INIT_LIST_HEAD(&osdc->req_lru);
2611         INIT_LIST_HEAD(&osdc->req_unsent);
2612         INIT_LIST_HEAD(&osdc->req_notarget);
2613         INIT_LIST_HEAD(&osdc->req_linger);
2614         osdc->num_requests = 0;
2615         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2616         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2617         spin_lock_init(&osdc->event_lock);
2618         osdc->event_tree = RB_ROOT;
2619         osdc->event_count = 0;
2620 
2621         schedule_delayed_work(&osdc->osds_timeout_work,
2622            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2623 
2624         err = -ENOMEM;
2625         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2626                                         sizeof(struct ceph_osd_request));
2627         if (!osdc->req_mempool)
2628                 goto out;
2629 
2630         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2631                                 OSD_OP_FRONT_LEN, 10, true,
2632                                 "osd_op");
2633         if (err < 0)
2634                 goto out_mempool;
2635         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2636                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2637                                 "osd_op_reply");
2638         if (err < 0)
2639                 goto out_msgpool;
2640 
2641         err = -ENOMEM;
2642         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2643         if (!osdc->notify_wq)
2644                 goto out_msgpool_reply;
2645 
2646         return 0;
2647 
2648 out_msgpool_reply:
2649         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2650 out_msgpool:
2651         ceph_msgpool_destroy(&osdc->msgpool_op);
2652 out_mempool:
2653         mempool_destroy(osdc->req_mempool);
2654 out:
2655         return err;
2656 }
2657 
2658 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2659 {
2660         flush_workqueue(osdc->notify_wq);
2661         destroy_workqueue(osdc->notify_wq);
2662         cancel_delayed_work_sync(&osdc->timeout_work);
2663         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2664         if (osdc->osdmap) {
2665                 ceph_osdmap_destroy(osdc->osdmap);
2666                 osdc->osdmap = NULL;
2667         }
2668         remove_all_osds(osdc);
2669         mempool_destroy(osdc->req_mempool);
2670         ceph_msgpool_destroy(&osdc->msgpool_op);
2671         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2672 }
2673 
2674 /*
2675  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2676  * *plen.  Return number of bytes read, or error.
2677  */
2678 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2679                         struct ceph_vino vino, struct ceph_file_layout *layout,
2680                         u64 off, u64 *plen,
2681                         u32 truncate_seq, u64 truncate_size,
2682                         struct page **pages, int num_pages, int page_align)
2683 {
2684         struct ceph_osd_request *req;
2685         int rc = 0;
2686 
2687         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2688              vino.snap, off, *plen);
2689         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2690                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2691                                     NULL, truncate_seq, truncate_size,
2692                                     false);
2693         if (IS_ERR(req))
2694                 return PTR_ERR(req);
2695 
2696         /* it may be a short read due to an object boundary */
2697 
2698         osd_req_op_extent_osd_data_pages(req, 0,
2699                                 pages, *plen, page_align, false, false);
2700 
2701         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2702              off, *plen, *plen, page_align);
2703 
2704         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2705 
2706         rc = ceph_osdc_start_request(osdc, req, false);
2707         if (!rc)
2708                 rc = ceph_osdc_wait_request(osdc, req);
2709 
2710         ceph_osdc_put_request(req);
2711         dout("readpages result %d\n", rc);
2712         return rc;
2713 }
2714 EXPORT_SYMBOL(ceph_osdc_readpages);
2715 
2716 /*
2717  * do a synchronous write on N pages
2718  */
2719 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2720                          struct ceph_file_layout *layout,
2721                          struct ceph_snap_context *snapc,
2722                          u64 off, u64 len,
2723                          u32 truncate_seq, u64 truncate_size,
2724                          struct timespec *mtime,
2725                          struct page **pages, int num_pages)
2726 {
2727         struct ceph_osd_request *req;
2728         int rc = 0;
2729         int page_align = off & ~PAGE_MASK;
2730 
2731         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2732         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2733                                     CEPH_OSD_OP_WRITE,
2734                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2735                                     snapc, truncate_seq, truncate_size,
2736                                     true);
2737         if (IS_ERR(req))
2738                 return PTR_ERR(req);
2739 
2740         /* it may be a short write due to an object boundary */
2741         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2742                                 false, false);
2743         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2744 
2745         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2746 
2747         rc = ceph_osdc_start_request(osdc, req, true);
2748         if (!rc)
2749                 rc = ceph_osdc_wait_request(osdc, req);
2750 
2751         ceph_osdc_put_request(req);
2752         if (rc == 0)
2753                 rc = len;
2754         dout("writepages result %d\n", rc);
2755         return rc;
2756 }
2757 EXPORT_SYMBOL(ceph_osdc_writepages);
2758 
2759 int ceph_osdc_setup(void)
2760 {
2761         BUG_ON(ceph_osd_request_cache);
2762         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2763                                         sizeof (struct ceph_osd_request),
2764                                         __alignof__(struct ceph_osd_request),
2765                                         0, NULL);
2766 
2767         return ceph_osd_request_cache ? 0 : -ENOMEM;
2768 }
2769 EXPORT_SYMBOL(ceph_osdc_setup);
2770 
2771 void ceph_osdc_cleanup(void)
2772 {
2773         BUG_ON(!ceph_osd_request_cache);
2774         kmem_cache_destroy(ceph_osd_request_cache);
2775         ceph_osd_request_cache = NULL;
2776 }
2777 EXPORT_SYMBOL(ceph_osdc_cleanup);
2778 
2779 /*
2780  * handle incoming message
2781  */
2782 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2783 {
2784         struct ceph_osd *osd = con->private;
2785         struct ceph_osd_client *osdc;
2786         int type = le16_to_cpu(msg->hdr.type);
2787 
2788         if (!osd)
2789                 goto out;
2790         osdc = osd->o_osdc;
2791 
2792         switch (type) {
2793         case CEPH_MSG_OSD_MAP:
2794                 ceph_osdc_handle_map(osdc, msg);
2795                 break;
2796         case CEPH_MSG_OSD_OPREPLY:
2797                 handle_reply(osdc, msg, con);
2798                 break;
2799         case CEPH_MSG_WATCH_NOTIFY:
2800                 handle_watch_notify(osdc, msg);
2801                 break;
2802 
2803         default:
2804                 pr_err("received unknown message type %d %s\n", type,
2805                        ceph_msg_type_name(type));
2806         }
2807 out:
2808         ceph_msg_put(msg);
2809 }
2810 
2811 /*
2812  * lookup and return message for incoming reply.  set up reply message
2813  * pages.
2814  */
2815 static struct ceph_msg *get_reply(struct ceph_connection *con,
2816                                   struct ceph_msg_header *hdr,
2817                                   int *skip)
2818 {
2819         struct ceph_osd *osd = con->private;
2820         struct ceph_osd_client *osdc = osd->o_osdc;
2821         struct ceph_msg *m;
2822         struct ceph_osd_request *req;
2823         int front_len = le32_to_cpu(hdr->front_len);
2824         int data_len = le32_to_cpu(hdr->data_len);
2825         u64 tid;
2826 
2827         tid = le64_to_cpu(hdr->tid);
2828         mutex_lock(&osdc->request_mutex);
2829         req = __lookup_request(osdc, tid);
2830         if (!req) {
2831                 *skip = 1;
2832                 m = NULL;
2833                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2834                      osd->o_osd);
2835                 goto out;
2836         }
2837 
2838         if (req->r_reply->con)
2839                 dout("%s revoking msg %p from old con %p\n", __func__,
2840                      req->r_reply, req->r_reply->con);
2841         ceph_msg_revoke_incoming(req->r_reply);
2842 
2843         if (front_len > req->r_reply->front_alloc_len) {
2844                 pr_warn("get_reply front %d > preallocated %d (%u#%llu)\n",
2845                         front_len, req->r_reply->front_alloc_len,
2846                         (unsigned int)con->peer_name.type,
2847                         le64_to_cpu(con->peer_name.num));
2848                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2849                                  false);
2850                 if (!m)
2851                         goto out;
2852                 ceph_msg_put(req->r_reply);
2853                 req->r_reply = m;
2854         }
2855         m = ceph_msg_get(req->r_reply);
2856 
2857         if (data_len > 0) {
2858                 struct ceph_osd_data *osd_data;
2859 
2860                 /*
2861                  * XXX This is assuming there is only one op containing
2862                  * XXX page data.  Probably OK for reads, but this
2863                  * XXX ought to be done more generally.
2864                  */
2865                 osd_data = osd_req_op_extent_osd_data(req, 0);
2866                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2867                         if (osd_data->pages &&
2868                                 unlikely(osd_data->length < data_len)) {
2869 
2870                                 pr_warn("tid %lld reply has %d bytes we had only %llu bytes ready\n",
2871                                         tid, data_len, osd_data->length);
2872                                 *skip = 1;
2873                                 ceph_msg_put(m);
2874                                 m = NULL;
2875                                 goto out;
2876                         }
2877                 }
2878         }
2879         *skip = 0;
2880         dout("get_reply tid %lld %p\n", tid, m);
2881 
2882 out:
2883         mutex_unlock(&osdc->request_mutex);
2884         return m;
2885 
2886 }
2887 
2888 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2889                                   struct ceph_msg_header *hdr,
2890                                   int *skip)
2891 {
2892         struct ceph_osd *osd = con->private;
2893         int type = le16_to_cpu(hdr->type);
2894         int front = le32_to_cpu(hdr->front_len);
2895 
2896         *skip = 0;
2897         switch (type) {
2898         case CEPH_MSG_OSD_MAP:
2899         case CEPH_MSG_WATCH_NOTIFY:
2900                 return ceph_msg_new(type, front, GFP_NOFS, false);
2901         case CEPH_MSG_OSD_OPREPLY:
2902                 return get_reply(con, hdr, skip);
2903         default:
2904                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2905                         osd->o_osd);
2906                 *skip = 1;
2907                 return NULL;
2908         }
2909 }
2910 
2911 /*
2912  * Wrappers to refcount containing ceph_osd struct
2913  */
2914 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2915 {
2916         struct ceph_osd *osd = con->private;
2917         if (get_osd(osd))
2918                 return con;
2919         return NULL;
2920 }
2921 
2922 static void put_osd_con(struct ceph_connection *con)
2923 {
2924         struct ceph_osd *osd = con->private;
2925         put_osd(osd);
2926 }
2927 
2928 /*
2929  * authentication
2930  */
2931 /*
2932  * Note: returned pointer is the address of a structure that's
2933  * managed separately.  Caller must *not* attempt to free it.
2934  */
2935 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2936                                         int *proto, int force_new)
2937 {
2938         struct ceph_osd *o = con->private;
2939         struct ceph_osd_client *osdc = o->o_osdc;
2940         struct ceph_auth_client *ac = osdc->client->monc.auth;
2941         struct ceph_auth_handshake *auth = &o->o_auth;
2942 
2943         if (force_new && auth->authorizer) {
2944                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2945                 auth->authorizer = NULL;
2946         }
2947         if (!auth->authorizer) {
2948                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2949                                                       auth);
2950                 if (ret)
2951                         return ERR_PTR(ret);
2952         } else {
2953                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2954                                                      auth);
2955                 if (ret)
2956                         return ERR_PTR(ret);
2957         }
2958         *proto = ac->protocol;
2959 
2960         return auth;
2961 }
2962 
2963 
2964 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2965 {
2966         struct ceph_osd *o = con->private;
2967         struct ceph_osd_client *osdc = o->o_osdc;
2968         struct ceph_auth_client *ac = osdc->client->monc.auth;
2969 
2970         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2971 }
2972 
2973 static int invalidate_authorizer(struct ceph_connection *con)
2974 {
2975         struct ceph_osd *o = con->private;
2976         struct ceph_osd_client *osdc = o->o_osdc;
2977         struct ceph_auth_client *ac = osdc->client->monc.auth;
2978 
2979         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2980         return ceph_monc_validate_auth(&osdc->client->monc);
2981 }
2982 
2983 static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
2984 {
2985         struct ceph_osd *o = con->private;
2986         struct ceph_auth_handshake *auth = &o->o_auth;
2987         return ceph_auth_sign_message(auth, msg);
2988 }
2989 
2990 static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
2991 {
2992         struct ceph_osd *o = con->private;
2993         struct ceph_auth_handshake *auth = &o->o_auth;
2994         return ceph_auth_check_message_signature(auth, msg);
2995 }
2996 
2997 static const struct ceph_connection_operations osd_con_ops = {
2998         .get = get_osd_con,
2999         .put = put_osd_con,
3000         .dispatch = dispatch,
3001         .get_authorizer = get_authorizer,
3002         .verify_authorizer_reply = verify_authorizer_reply,
3003         .invalidate_authorizer = invalidate_authorizer,
3004         .alloc_msg = alloc_msg,
3005         .sign_message = sign_message,
3006         .check_message_signature = check_message_signature,
3007         .fault = osd_reset,
3008 };
3009 

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