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TOMOYO Linux Cross Reference
Linux/net/ceph/osd_client.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 
  3 #include <linux/ceph/ceph_debug.h>
  4 
  5 #include <linux/module.h>
  6 #include <linux/err.h>
  7 #include <linux/highmem.h>
  8 #include <linux/mm.h>
  9 #include <linux/pagemap.h>
 10 #include <linux/slab.h>
 11 #include <linux/uaccess.h>
 12 #ifdef CONFIG_BLOCK
 13 #include <linux/bio.h>
 14 #endif
 15 
 16 #include <linux/ceph/ceph_features.h>
 17 #include <linux/ceph/libceph.h>
 18 #include <linux/ceph/osd_client.h>
 19 #include <linux/ceph/messenger.h>
 20 #include <linux/ceph/decode.h>
 21 #include <linux/ceph/auth.h>
 22 #include <linux/ceph/pagelist.h>
 23 
 24 #define OSD_OPREPLY_FRONT_LEN   512
 25 
 26 static struct kmem_cache        *ceph_osd_request_cache;
 27 
 28 static const struct ceph_connection_operations osd_con_ops;
 29 
 30 /*
 31  * Implement client access to distributed object storage cluster.
 32  *
 33  * All data objects are stored within a cluster/cloud of OSDs, or
 34  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
 35  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
 36  * remote daemons serving up and coordinating consistent and safe
 37  * access to storage.
 38  *
 39  * Cluster membership and the mapping of data objects onto storage devices
 40  * are described by the osd map.
 41  *
 42  * We keep track of pending OSD requests (read, write), resubmit
 43  * requests to different OSDs when the cluster topology/data layout
 44  * change, or retry the affected requests when the communications
 45  * channel with an OSD is reset.
 46  */
 47 
 48 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
 49 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
 50 static void link_linger(struct ceph_osd *osd,
 51                         struct ceph_osd_linger_request *lreq);
 52 static void unlink_linger(struct ceph_osd *osd,
 53                           struct ceph_osd_linger_request *lreq);
 54 static void clear_backoffs(struct ceph_osd *osd);
 55 
 56 #if 1
 57 static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
 58 {
 59         bool wrlocked = true;
 60 
 61         if (unlikely(down_read_trylock(sem))) {
 62                 wrlocked = false;
 63                 up_read(sem);
 64         }
 65 
 66         return wrlocked;
 67 }
 68 static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
 69 {
 70         WARN_ON(!rwsem_is_locked(&osdc->lock));
 71 }
 72 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
 73 {
 74         WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
 75 }
 76 static inline void verify_osd_locked(struct ceph_osd *osd)
 77 {
 78         struct ceph_osd_client *osdc = osd->o_osdc;
 79 
 80         WARN_ON(!(mutex_is_locked(&osd->lock) &&
 81                   rwsem_is_locked(&osdc->lock)) &&
 82                 !rwsem_is_wrlocked(&osdc->lock));
 83 }
 84 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
 85 {
 86         WARN_ON(!mutex_is_locked(&lreq->lock));
 87 }
 88 #else
 89 static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
 90 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
 91 static inline void verify_osd_locked(struct ceph_osd *osd) { }
 92 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
 93 #endif
 94 
 95 /*
 96  * calculate the mapping of a file extent onto an object, and fill out the
 97  * request accordingly.  shorten extent as necessary if it crosses an
 98  * object boundary.
 99  *
100  * fill osd op in request message.
101  */
102 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
103                         u64 *objnum, u64 *objoff, u64 *objlen)
104 {
105         u64 orig_len = *plen;
106         int r;
107 
108         /* object extent? */
109         r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
110                                           objoff, objlen);
111         if (r < 0)
112                 return r;
113         if (*objlen < orig_len) {
114                 *plen = *objlen;
115                 dout(" skipping last %llu, final file extent %llu~%llu\n",
116                      orig_len - *plen, off, *plen);
117         }
118 
119         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
120 
121         return 0;
122 }
123 
124 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
125 {
126         memset(osd_data, 0, sizeof (*osd_data));
127         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
128 }
129 
130 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
131                         struct page **pages, u64 length, u32 alignment,
132                         bool pages_from_pool, bool own_pages)
133 {
134         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
135         osd_data->pages = pages;
136         osd_data->length = length;
137         osd_data->alignment = alignment;
138         osd_data->pages_from_pool = pages_from_pool;
139         osd_data->own_pages = own_pages;
140 }
141 
142 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
143                         struct ceph_pagelist *pagelist)
144 {
145         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
146         osd_data->pagelist = pagelist;
147 }
148 
149 #ifdef CONFIG_BLOCK
150 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
151                         struct bio *bio, size_t bio_length)
152 {
153         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
154         osd_data->bio = bio;
155         osd_data->bio_length = bio_length;
156 }
157 #endif /* CONFIG_BLOCK */
158 
159 #define osd_req_op_data(oreq, whch, typ, fld)                           \
160 ({                                                                      \
161         struct ceph_osd_request *__oreq = (oreq);                       \
162         unsigned int __whch = (whch);                                   \
163         BUG_ON(__whch >= __oreq->r_num_ops);                            \
164         &__oreq->r_ops[__whch].typ.fld;                                 \
165 })
166 
167 static struct ceph_osd_data *
168 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
169 {
170         BUG_ON(which >= osd_req->r_num_ops);
171 
172         return &osd_req->r_ops[which].raw_data_in;
173 }
174 
175 struct ceph_osd_data *
176 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
177                         unsigned int which)
178 {
179         return osd_req_op_data(osd_req, which, extent, osd_data);
180 }
181 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
182 
183 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
184                         unsigned int which, struct page **pages,
185                         u64 length, u32 alignment,
186                         bool pages_from_pool, bool own_pages)
187 {
188         struct ceph_osd_data *osd_data;
189 
190         osd_data = osd_req_op_raw_data_in(osd_req, which);
191         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
192                                 pages_from_pool, own_pages);
193 }
194 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
195 
196 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
197                         unsigned int which, struct page **pages,
198                         u64 length, u32 alignment,
199                         bool pages_from_pool, bool own_pages)
200 {
201         struct ceph_osd_data *osd_data;
202 
203         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
204         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
205                                 pages_from_pool, own_pages);
206 }
207 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
208 
209 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
210                         unsigned int which, struct ceph_pagelist *pagelist)
211 {
212         struct ceph_osd_data *osd_data;
213 
214         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
215         ceph_osd_data_pagelist_init(osd_data, pagelist);
216 }
217 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
218 
219 #ifdef CONFIG_BLOCK
220 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
221                         unsigned int which, struct bio *bio, size_t bio_length)
222 {
223         struct ceph_osd_data *osd_data;
224 
225         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
226         ceph_osd_data_bio_init(osd_data, bio, bio_length);
227 }
228 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
229 #endif /* CONFIG_BLOCK */
230 
231 static void osd_req_op_cls_request_info_pagelist(
232                         struct ceph_osd_request *osd_req,
233                         unsigned int which, struct ceph_pagelist *pagelist)
234 {
235         struct ceph_osd_data *osd_data;
236 
237         osd_data = osd_req_op_data(osd_req, which, cls, request_info);
238         ceph_osd_data_pagelist_init(osd_data, pagelist);
239 }
240 
241 void osd_req_op_cls_request_data_pagelist(
242                         struct ceph_osd_request *osd_req,
243                         unsigned int which, struct ceph_pagelist *pagelist)
244 {
245         struct ceph_osd_data *osd_data;
246 
247         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
248         ceph_osd_data_pagelist_init(osd_data, pagelist);
249         osd_req->r_ops[which].cls.indata_len += pagelist->length;
250         osd_req->r_ops[which].indata_len += pagelist->length;
251 }
252 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
253 
254 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
255                         unsigned int which, struct page **pages, u64 length,
256                         u32 alignment, bool pages_from_pool, bool own_pages)
257 {
258         struct ceph_osd_data *osd_data;
259 
260         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
261         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
262                                 pages_from_pool, own_pages);
263         osd_req->r_ops[which].cls.indata_len += length;
264         osd_req->r_ops[which].indata_len += length;
265 }
266 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
267 
268 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
269                         unsigned int which, struct page **pages, u64 length,
270                         u32 alignment, bool pages_from_pool, bool own_pages)
271 {
272         struct ceph_osd_data *osd_data;
273 
274         osd_data = osd_req_op_data(osd_req, which, cls, response_data);
275         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
276                                 pages_from_pool, own_pages);
277 }
278 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
279 
280 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
281 {
282         switch (osd_data->type) {
283         case CEPH_OSD_DATA_TYPE_NONE:
284                 return 0;
285         case CEPH_OSD_DATA_TYPE_PAGES:
286                 return osd_data->length;
287         case CEPH_OSD_DATA_TYPE_PAGELIST:
288                 return (u64)osd_data->pagelist->length;
289 #ifdef CONFIG_BLOCK
290         case CEPH_OSD_DATA_TYPE_BIO:
291                 return (u64)osd_data->bio_length;
292 #endif /* CONFIG_BLOCK */
293         default:
294                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
295                 return 0;
296         }
297 }
298 
299 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
300 {
301         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
302                 int num_pages;
303 
304                 num_pages = calc_pages_for((u64)osd_data->alignment,
305                                                 (u64)osd_data->length);
306                 ceph_release_page_vector(osd_data->pages, num_pages);
307         }
308         ceph_osd_data_init(osd_data);
309 }
310 
311 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
312                         unsigned int which)
313 {
314         struct ceph_osd_req_op *op;
315 
316         BUG_ON(which >= osd_req->r_num_ops);
317         op = &osd_req->r_ops[which];
318 
319         switch (op->op) {
320         case CEPH_OSD_OP_READ:
321         case CEPH_OSD_OP_WRITE:
322         case CEPH_OSD_OP_WRITEFULL:
323                 ceph_osd_data_release(&op->extent.osd_data);
324                 break;
325         case CEPH_OSD_OP_CALL:
326                 ceph_osd_data_release(&op->cls.request_info);
327                 ceph_osd_data_release(&op->cls.request_data);
328                 ceph_osd_data_release(&op->cls.response_data);
329                 break;
330         case CEPH_OSD_OP_SETXATTR:
331         case CEPH_OSD_OP_CMPXATTR:
332                 ceph_osd_data_release(&op->xattr.osd_data);
333                 break;
334         case CEPH_OSD_OP_STAT:
335                 ceph_osd_data_release(&op->raw_data_in);
336                 break;
337         case CEPH_OSD_OP_NOTIFY_ACK:
338                 ceph_osd_data_release(&op->notify_ack.request_data);
339                 break;
340         case CEPH_OSD_OP_NOTIFY:
341                 ceph_osd_data_release(&op->notify.request_data);
342                 ceph_osd_data_release(&op->notify.response_data);
343                 break;
344         case CEPH_OSD_OP_LIST_WATCHERS:
345                 ceph_osd_data_release(&op->list_watchers.response_data);
346                 break;
347         default:
348                 break;
349         }
350 }
351 
352 /*
353  * Assumes @t is zero-initialized.
354  */
355 static void target_init(struct ceph_osd_request_target *t)
356 {
357         ceph_oid_init(&t->base_oid);
358         ceph_oloc_init(&t->base_oloc);
359         ceph_oid_init(&t->target_oid);
360         ceph_oloc_init(&t->target_oloc);
361 
362         ceph_osds_init(&t->acting);
363         ceph_osds_init(&t->up);
364         t->size = -1;
365         t->min_size = -1;
366 
367         t->osd = CEPH_HOMELESS_OSD;
368 }
369 
370 static void target_copy(struct ceph_osd_request_target *dest,
371                         const struct ceph_osd_request_target *src)
372 {
373         ceph_oid_copy(&dest->base_oid, &src->base_oid);
374         ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
375         ceph_oid_copy(&dest->target_oid, &src->target_oid);
376         ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);
377 
378         dest->pgid = src->pgid; /* struct */
379         dest->spgid = src->spgid; /* struct */
380         dest->pg_num = src->pg_num;
381         dest->pg_num_mask = src->pg_num_mask;
382         ceph_osds_copy(&dest->acting, &src->acting);
383         ceph_osds_copy(&dest->up, &src->up);
384         dest->size = src->size;
385         dest->min_size = src->min_size;
386         dest->sort_bitwise = src->sort_bitwise;
387 
388         dest->flags = src->flags;
389         dest->paused = src->paused;
390 
391         dest->epoch = src->epoch;
392         dest->last_force_resend = src->last_force_resend;
393 
394         dest->osd = src->osd;
395 }
396 
397 static void target_destroy(struct ceph_osd_request_target *t)
398 {
399         ceph_oid_destroy(&t->base_oid);
400         ceph_oloc_destroy(&t->base_oloc);
401         ceph_oid_destroy(&t->target_oid);
402         ceph_oloc_destroy(&t->target_oloc);
403 }
404 
405 /*
406  * requests
407  */
408 static void request_release_checks(struct ceph_osd_request *req)
409 {
410         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
411         WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
412         WARN_ON(!list_empty(&req->r_unsafe_item));
413         WARN_ON(req->r_osd);
414 }
415 
416 static void ceph_osdc_release_request(struct kref *kref)
417 {
418         struct ceph_osd_request *req = container_of(kref,
419                                             struct ceph_osd_request, r_kref);
420         unsigned int which;
421 
422         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
423              req->r_request, req->r_reply);
424         request_release_checks(req);
425 
426         if (req->r_request)
427                 ceph_msg_put(req->r_request);
428         if (req->r_reply)
429                 ceph_msg_put(req->r_reply);
430 
431         for (which = 0; which < req->r_num_ops; which++)
432                 osd_req_op_data_release(req, which);
433 
434         target_destroy(&req->r_t);
435         ceph_put_snap_context(req->r_snapc);
436 
437         if (req->r_mempool)
438                 mempool_free(req, req->r_osdc->req_mempool);
439         else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
440                 kmem_cache_free(ceph_osd_request_cache, req);
441         else
442                 kfree(req);
443 }
444 
445 void ceph_osdc_get_request(struct ceph_osd_request *req)
446 {
447         dout("%s %p (was %d)\n", __func__, req,
448              kref_read(&req->r_kref));
449         kref_get(&req->r_kref);
450 }
451 EXPORT_SYMBOL(ceph_osdc_get_request);
452 
453 void ceph_osdc_put_request(struct ceph_osd_request *req)
454 {
455         if (req) {
456                 dout("%s %p (was %d)\n", __func__, req,
457                      kref_read(&req->r_kref));
458                 kref_put(&req->r_kref, ceph_osdc_release_request);
459         }
460 }
461 EXPORT_SYMBOL(ceph_osdc_put_request);
462 
463 static void request_init(struct ceph_osd_request *req)
464 {
465         /* req only, each op is zeroed in _osd_req_op_init() */
466         memset(req, 0, sizeof(*req));
467 
468         kref_init(&req->r_kref);
469         init_completion(&req->r_completion);
470         RB_CLEAR_NODE(&req->r_node);
471         RB_CLEAR_NODE(&req->r_mc_node);
472         INIT_LIST_HEAD(&req->r_unsafe_item);
473 
474         target_init(&req->r_t);
475 }
476 
477 /*
478  * This is ugly, but it allows us to reuse linger registration and ping
479  * requests, keeping the structure of the code around send_linger{_ping}()
480  * reasonable.  Setting up a min_nr=2 mempool for each linger request
481  * and dealing with copying ops (this blasts req only, watch op remains
482  * intact) isn't any better.
483  */
484 static void request_reinit(struct ceph_osd_request *req)
485 {
486         struct ceph_osd_client *osdc = req->r_osdc;
487         bool mempool = req->r_mempool;
488         unsigned int num_ops = req->r_num_ops;
489         u64 snapid = req->r_snapid;
490         struct ceph_snap_context *snapc = req->r_snapc;
491         bool linger = req->r_linger;
492         struct ceph_msg *request_msg = req->r_request;
493         struct ceph_msg *reply_msg = req->r_reply;
494 
495         dout("%s req %p\n", __func__, req);
496         WARN_ON(kref_read(&req->r_kref) != 1);
497         request_release_checks(req);
498 
499         WARN_ON(kref_read(&request_msg->kref) != 1);
500         WARN_ON(kref_read(&reply_msg->kref) != 1);
501         target_destroy(&req->r_t);
502 
503         request_init(req);
504         req->r_osdc = osdc;
505         req->r_mempool = mempool;
506         req->r_num_ops = num_ops;
507         req->r_snapid = snapid;
508         req->r_snapc = snapc;
509         req->r_linger = linger;
510         req->r_request = request_msg;
511         req->r_reply = reply_msg;
512 }
513 
514 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
515                                                struct ceph_snap_context *snapc,
516                                                unsigned int num_ops,
517                                                bool use_mempool,
518                                                gfp_t gfp_flags)
519 {
520         struct ceph_osd_request *req;
521 
522         if (use_mempool) {
523                 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
524                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
525         } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
526                 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
527         } else {
528                 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
529                 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
530                               gfp_flags);
531         }
532         if (unlikely(!req))
533                 return NULL;
534 
535         request_init(req);
536         req->r_osdc = osdc;
537         req->r_mempool = use_mempool;
538         req->r_num_ops = num_ops;
539         req->r_snapid = CEPH_NOSNAP;
540         req->r_snapc = ceph_get_snap_context(snapc);
541 
542         dout("%s req %p\n", __func__, req);
543         return req;
544 }
545 EXPORT_SYMBOL(ceph_osdc_alloc_request);
546 
547 static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
548 {
549         return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
550 }
551 
552 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
553 {
554         struct ceph_osd_client *osdc = req->r_osdc;
555         struct ceph_msg *msg;
556         int msg_size;
557 
558         WARN_ON(ceph_oid_empty(&req->r_base_oid));
559         WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
560 
561         /* create request message */
562         msg_size = CEPH_ENCODING_START_BLK_LEN +
563                         CEPH_PGID_ENCODING_LEN + 1; /* spgid */
564         msg_size += 4 + 4 + 4; /* hash, osdmap_epoch, flags */
565         msg_size += CEPH_ENCODING_START_BLK_LEN +
566                         sizeof(struct ceph_osd_reqid); /* reqid */
567         msg_size += sizeof(struct ceph_blkin_trace_info); /* trace */
568         msg_size += 4 + sizeof(struct ceph_timespec); /* client_inc, mtime */
569         msg_size += CEPH_ENCODING_START_BLK_LEN +
570                         ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
571         msg_size += 4 + req->r_base_oid.name_len; /* oid */
572         msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
573         msg_size += 8; /* snapid */
574         msg_size += 8; /* snap_seq */
575         msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
576         msg_size += 4 + 8; /* retry_attempt, features */
577 
578         if (req->r_mempool)
579                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
580         else
581                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
582         if (!msg)
583                 return -ENOMEM;
584 
585         memset(msg->front.iov_base, 0, msg->front.iov_len);
586         req->r_request = msg;
587 
588         /* create reply message */
589         msg_size = OSD_OPREPLY_FRONT_LEN;
590         msg_size += req->r_base_oid.name_len;
591         msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
592 
593         if (req->r_mempool)
594                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
595         else
596                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
597         if (!msg)
598                 return -ENOMEM;
599 
600         req->r_reply = msg;
601 
602         return 0;
603 }
604 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
605 
606 static bool osd_req_opcode_valid(u16 opcode)
607 {
608         switch (opcode) {
609 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
610 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
611 #undef GENERATE_CASE
612         default:
613                 return false;
614         }
615 }
616 
617 /*
618  * This is an osd op init function for opcodes that have no data or
619  * other information associated with them.  It also serves as a
620  * common init routine for all the other init functions, below.
621  */
622 static struct ceph_osd_req_op *
623 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
624                  u16 opcode, u32 flags)
625 {
626         struct ceph_osd_req_op *op;
627 
628         BUG_ON(which >= osd_req->r_num_ops);
629         BUG_ON(!osd_req_opcode_valid(opcode));
630 
631         op = &osd_req->r_ops[which];
632         memset(op, 0, sizeof (*op));
633         op->op = opcode;
634         op->flags = flags;
635 
636         return op;
637 }
638 
639 void osd_req_op_init(struct ceph_osd_request *osd_req,
640                      unsigned int which, u16 opcode, u32 flags)
641 {
642         (void)_osd_req_op_init(osd_req, which, opcode, flags);
643 }
644 EXPORT_SYMBOL(osd_req_op_init);
645 
646 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
647                                 unsigned int which, u16 opcode,
648                                 u64 offset, u64 length,
649                                 u64 truncate_size, u32 truncate_seq)
650 {
651         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
652                                                       opcode, 0);
653         size_t payload_len = 0;
654 
655         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
656                opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
657                opcode != CEPH_OSD_OP_TRUNCATE);
658 
659         op->extent.offset = offset;
660         op->extent.length = length;
661         op->extent.truncate_size = truncate_size;
662         op->extent.truncate_seq = truncate_seq;
663         if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
664                 payload_len += length;
665 
666         op->indata_len = payload_len;
667 }
668 EXPORT_SYMBOL(osd_req_op_extent_init);
669 
670 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
671                                 unsigned int which, u64 length)
672 {
673         struct ceph_osd_req_op *op;
674         u64 previous;
675 
676         BUG_ON(which >= osd_req->r_num_ops);
677         op = &osd_req->r_ops[which];
678         previous = op->extent.length;
679 
680         if (length == previous)
681                 return;         /* Nothing to do */
682         BUG_ON(length > previous);
683 
684         op->extent.length = length;
685         if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
686                 op->indata_len -= previous - length;
687 }
688 EXPORT_SYMBOL(osd_req_op_extent_update);
689 
690 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
691                                 unsigned int which, u64 offset_inc)
692 {
693         struct ceph_osd_req_op *op, *prev_op;
694 
695         BUG_ON(which + 1 >= osd_req->r_num_ops);
696 
697         prev_op = &osd_req->r_ops[which];
698         op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
699         /* dup previous one */
700         op->indata_len = prev_op->indata_len;
701         op->outdata_len = prev_op->outdata_len;
702         op->extent = prev_op->extent;
703         /* adjust offset */
704         op->extent.offset += offset_inc;
705         op->extent.length -= offset_inc;
706 
707         if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
708                 op->indata_len -= offset_inc;
709 }
710 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
711 
712 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
713                         u16 opcode, const char *class, const char *method)
714 {
715         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
716                                                       opcode, 0);
717         struct ceph_pagelist *pagelist;
718         size_t payload_len = 0;
719         size_t size;
720 
721         BUG_ON(opcode != CEPH_OSD_OP_CALL);
722 
723         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
724         BUG_ON(!pagelist);
725         ceph_pagelist_init(pagelist);
726 
727         op->cls.class_name = class;
728         size = strlen(class);
729         BUG_ON(size > (size_t) U8_MAX);
730         op->cls.class_len = size;
731         ceph_pagelist_append(pagelist, class, size);
732         payload_len += size;
733 
734         op->cls.method_name = method;
735         size = strlen(method);
736         BUG_ON(size > (size_t) U8_MAX);
737         op->cls.method_len = size;
738         ceph_pagelist_append(pagelist, method, size);
739         payload_len += size;
740 
741         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
742 
743         op->indata_len = payload_len;
744 }
745 EXPORT_SYMBOL(osd_req_op_cls_init);
746 
747 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
748                           u16 opcode, const char *name, const void *value,
749                           size_t size, u8 cmp_op, u8 cmp_mode)
750 {
751         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
752                                                       opcode, 0);
753         struct ceph_pagelist *pagelist;
754         size_t payload_len;
755 
756         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
757 
758         pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
759         if (!pagelist)
760                 return -ENOMEM;
761 
762         ceph_pagelist_init(pagelist);
763 
764         payload_len = strlen(name);
765         op->xattr.name_len = payload_len;
766         ceph_pagelist_append(pagelist, name, payload_len);
767 
768         op->xattr.value_len = size;
769         ceph_pagelist_append(pagelist, value, size);
770         payload_len += size;
771 
772         op->xattr.cmp_op = cmp_op;
773         op->xattr.cmp_mode = cmp_mode;
774 
775         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
776         op->indata_len = payload_len;
777         return 0;
778 }
779 EXPORT_SYMBOL(osd_req_op_xattr_init);
780 
781 /*
782  * @watch_opcode: CEPH_OSD_WATCH_OP_*
783  */
784 static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
785                                   u64 cookie, u8 watch_opcode)
786 {
787         struct ceph_osd_req_op *op;
788 
789         op = _osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
790         op->watch.cookie = cookie;
791         op->watch.op = watch_opcode;
792         op->watch.gen = 0;
793 }
794 
795 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
796                                 unsigned int which,
797                                 u64 expected_object_size,
798                                 u64 expected_write_size)
799 {
800         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
801                                                       CEPH_OSD_OP_SETALLOCHINT,
802                                                       0);
803 
804         op->alloc_hint.expected_object_size = expected_object_size;
805         op->alloc_hint.expected_write_size = expected_write_size;
806 
807         /*
808          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
809          * not worth a feature bit.  Set FAILOK per-op flag to make
810          * sure older osds don't trip over an unsupported opcode.
811          */
812         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
813 }
814 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
815 
816 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
817                                 struct ceph_osd_data *osd_data)
818 {
819         u64 length = ceph_osd_data_length(osd_data);
820 
821         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
822                 BUG_ON(length > (u64) SIZE_MAX);
823                 if (length)
824                         ceph_msg_data_add_pages(msg, osd_data->pages,
825                                         length, osd_data->alignment);
826         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
827                 BUG_ON(!length);
828                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
829 #ifdef CONFIG_BLOCK
830         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
831                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
832 #endif
833         } else {
834                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
835         }
836 }
837 
838 static u32 osd_req_encode_op(struct ceph_osd_op *dst,
839                              const struct ceph_osd_req_op *src)
840 {
841         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
842                 pr_err("unrecognized osd opcode %d\n", src->op);
843 
844                 return 0;
845         }
846 
847         switch (src->op) {
848         case CEPH_OSD_OP_STAT:
849                 break;
850         case CEPH_OSD_OP_READ:
851         case CEPH_OSD_OP_WRITE:
852         case CEPH_OSD_OP_WRITEFULL:
853         case CEPH_OSD_OP_ZERO:
854         case CEPH_OSD_OP_TRUNCATE:
855                 dst->extent.offset = cpu_to_le64(src->extent.offset);
856                 dst->extent.length = cpu_to_le64(src->extent.length);
857                 dst->extent.truncate_size =
858                         cpu_to_le64(src->extent.truncate_size);
859                 dst->extent.truncate_seq =
860                         cpu_to_le32(src->extent.truncate_seq);
861                 break;
862         case CEPH_OSD_OP_CALL:
863                 dst->cls.class_len = src->cls.class_len;
864                 dst->cls.method_len = src->cls.method_len;
865                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
866                 break;
867         case CEPH_OSD_OP_WATCH:
868                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
869                 dst->watch.ver = cpu_to_le64(0);
870                 dst->watch.op = src->watch.op;
871                 dst->watch.gen = cpu_to_le32(src->watch.gen);
872                 break;
873         case CEPH_OSD_OP_NOTIFY_ACK:
874                 break;
875         case CEPH_OSD_OP_NOTIFY:
876                 dst->notify.cookie = cpu_to_le64(src->notify.cookie);
877                 break;
878         case CEPH_OSD_OP_LIST_WATCHERS:
879                 break;
880         case CEPH_OSD_OP_SETALLOCHINT:
881                 dst->alloc_hint.expected_object_size =
882                     cpu_to_le64(src->alloc_hint.expected_object_size);
883                 dst->alloc_hint.expected_write_size =
884                     cpu_to_le64(src->alloc_hint.expected_write_size);
885                 break;
886         case CEPH_OSD_OP_SETXATTR:
887         case CEPH_OSD_OP_CMPXATTR:
888                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
889                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
890                 dst->xattr.cmp_op = src->xattr.cmp_op;
891                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
892                 break;
893         case CEPH_OSD_OP_CREATE:
894         case CEPH_OSD_OP_DELETE:
895                 break;
896         default:
897                 pr_err("unsupported osd opcode %s\n",
898                         ceph_osd_op_name(src->op));
899                 WARN_ON(1);
900 
901                 return 0;
902         }
903 
904         dst->op = cpu_to_le16(src->op);
905         dst->flags = cpu_to_le32(src->flags);
906         dst->payload_len = cpu_to_le32(src->indata_len);
907 
908         return src->indata_len;
909 }
910 
911 /*
912  * build new request AND message, calculate layout, and adjust file
913  * extent as needed.
914  *
915  * if the file was recently truncated, we include information about its
916  * old and new size so that the object can be updated appropriately.  (we
917  * avoid synchronously deleting truncated objects because it's slow.)
918  */
919 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
920                                                struct ceph_file_layout *layout,
921                                                struct ceph_vino vino,
922                                                u64 off, u64 *plen,
923                                                unsigned int which, int num_ops,
924                                                int opcode, int flags,
925                                                struct ceph_snap_context *snapc,
926                                                u32 truncate_seq,
927                                                u64 truncate_size,
928                                                bool use_mempool)
929 {
930         struct ceph_osd_request *req;
931         u64 objnum = 0;
932         u64 objoff = 0;
933         u64 objlen = 0;
934         int r;
935 
936         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
937                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
938                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
939 
940         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
941                                         GFP_NOFS);
942         if (!req) {
943                 r = -ENOMEM;
944                 goto fail;
945         }
946 
947         /* calculate max write size */
948         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
949         if (r)
950                 goto fail;
951 
952         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
953                 osd_req_op_init(req, which, opcode, 0);
954         } else {
955                 u32 object_size = layout->object_size;
956                 u32 object_base = off - objoff;
957                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
958                         if (truncate_size <= object_base) {
959                                 truncate_size = 0;
960                         } else {
961                                 truncate_size -= object_base;
962                                 if (truncate_size > object_size)
963                                         truncate_size = object_size;
964                         }
965                 }
966                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
967                                        truncate_size, truncate_seq);
968         }
969 
970         req->r_abort_on_full = true;
971         req->r_flags = flags;
972         req->r_base_oloc.pool = layout->pool_id;
973         req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
974         ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
975 
976         req->r_snapid = vino.snap;
977         if (flags & CEPH_OSD_FLAG_WRITE)
978                 req->r_data_offset = off;
979 
980         r = ceph_osdc_alloc_messages(req, GFP_NOFS);
981         if (r)
982                 goto fail;
983 
984         return req;
985 
986 fail:
987         ceph_osdc_put_request(req);
988         return ERR_PTR(r);
989 }
990 EXPORT_SYMBOL(ceph_osdc_new_request);
991 
992 /*
993  * We keep osd requests in an rbtree, sorted by ->r_tid.
994  */
995 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
996 DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
997 
998 static bool osd_homeless(struct ceph_osd *osd)
999 {
1000         return osd->o_osd == CEPH_HOMELESS_OSD;
1001 }
1002 
1003 static bool osd_registered(struct ceph_osd *osd)
1004 {
1005         verify_osdc_locked(osd->o_osdc);
1006 
1007         return !RB_EMPTY_NODE(&osd->o_node);
1008 }
1009 
1010 /*
1011  * Assumes @osd is zero-initialized.
1012  */
1013 static void osd_init(struct ceph_osd *osd)
1014 {
1015         refcount_set(&osd->o_ref, 1);
1016         RB_CLEAR_NODE(&osd->o_node);
1017         osd->o_requests = RB_ROOT;
1018         osd->o_linger_requests = RB_ROOT;
1019         osd->o_backoff_mappings = RB_ROOT;
1020         osd->o_backoffs_by_id = RB_ROOT;
1021         INIT_LIST_HEAD(&osd->o_osd_lru);
1022         INIT_LIST_HEAD(&osd->o_keepalive_item);
1023         osd->o_incarnation = 1;
1024         mutex_init(&osd->lock);
1025 }
1026 
1027 static void osd_cleanup(struct ceph_osd *osd)
1028 {
1029         WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1030         WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1031         WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1032         WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoff_mappings));
1033         WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoffs_by_id));
1034         WARN_ON(!list_empty(&osd->o_osd_lru));
1035         WARN_ON(!list_empty(&osd->o_keepalive_item));
1036 
1037         if (osd->o_auth.authorizer) {
1038                 WARN_ON(osd_homeless(osd));
1039                 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1040         }
1041 }
1042 
1043 /*
1044  * Track open sessions with osds.
1045  */
1046 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1047 {
1048         struct ceph_osd *osd;
1049 
1050         WARN_ON(onum == CEPH_HOMELESS_OSD);
1051 
1052         osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1053         osd_init(osd);
1054         osd->o_osdc = osdc;
1055         osd->o_osd = onum;
1056 
1057         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1058 
1059         return osd;
1060 }
1061 
1062 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1063 {
1064         if (refcount_inc_not_zero(&osd->o_ref)) {
1065                 dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
1066                      refcount_read(&osd->o_ref));
1067                 return osd;
1068         } else {
1069                 dout("get_osd %p FAIL\n", osd);
1070                 return NULL;
1071         }
1072 }
1073 
1074 static void put_osd(struct ceph_osd *osd)
1075 {
1076         dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
1077              refcount_read(&osd->o_ref) - 1);
1078         if (refcount_dec_and_test(&osd->o_ref)) {
1079                 osd_cleanup(osd);
1080                 kfree(osd);
1081         }
1082 }
1083 
1084 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1085 
1086 static void __move_osd_to_lru(struct ceph_osd *osd)
1087 {
1088         struct ceph_osd_client *osdc = osd->o_osdc;
1089 
1090         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1091         BUG_ON(!list_empty(&osd->o_osd_lru));
1092 
1093         spin_lock(&osdc->osd_lru_lock);
1094         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1095         spin_unlock(&osdc->osd_lru_lock);
1096 
1097         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1098 }
1099 
1100 static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1101 {
1102         if (RB_EMPTY_ROOT(&osd->o_requests) &&
1103             RB_EMPTY_ROOT(&osd->o_linger_requests))
1104                 __move_osd_to_lru(osd);
1105 }
1106 
1107 static void __remove_osd_from_lru(struct ceph_osd *osd)
1108 {
1109         struct ceph_osd_client *osdc = osd->o_osdc;
1110 
1111         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1112 
1113         spin_lock(&osdc->osd_lru_lock);
1114         if (!list_empty(&osd->o_osd_lru))
1115                 list_del_init(&osd->o_osd_lru);
1116         spin_unlock(&osdc->osd_lru_lock);
1117 }
1118 
1119 /*
1120  * Close the connection and assign any leftover requests to the
1121  * homeless session.
1122  */
1123 static void close_osd(struct ceph_osd *osd)
1124 {
1125         struct ceph_osd_client *osdc = osd->o_osdc;
1126         struct rb_node *n;
1127 
1128         verify_osdc_wrlocked(osdc);
1129         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1130 
1131         ceph_con_close(&osd->o_con);
1132 
1133         for (n = rb_first(&osd->o_requests); n; ) {
1134                 struct ceph_osd_request *req =
1135                     rb_entry(n, struct ceph_osd_request, r_node);
1136 
1137                 n = rb_next(n); /* unlink_request() */
1138 
1139                 dout(" reassigning req %p tid %llu\n", req, req->r_tid);
1140                 unlink_request(osd, req);
1141                 link_request(&osdc->homeless_osd, req);
1142         }
1143         for (n = rb_first(&osd->o_linger_requests); n; ) {
1144                 struct ceph_osd_linger_request *lreq =
1145                     rb_entry(n, struct ceph_osd_linger_request, node);
1146 
1147                 n = rb_next(n); /* unlink_linger() */
1148 
1149                 dout(" reassigning lreq %p linger_id %llu\n", lreq,
1150                      lreq->linger_id);
1151                 unlink_linger(osd, lreq);
1152                 link_linger(&osdc->homeless_osd, lreq);
1153         }
1154         clear_backoffs(osd);
1155 
1156         __remove_osd_from_lru(osd);
1157         erase_osd(&osdc->osds, osd);
1158         put_osd(osd);
1159 }
1160 
1161 /*
1162  * reset osd connect
1163  */
1164 static int reopen_osd(struct ceph_osd *osd)
1165 {
1166         struct ceph_entity_addr *peer_addr;
1167 
1168         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1169 
1170         if (RB_EMPTY_ROOT(&osd->o_requests) &&
1171             RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1172                 close_osd(osd);
1173                 return -ENODEV;
1174         }
1175 
1176         peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
1177         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1178                         !ceph_con_opened(&osd->o_con)) {
1179                 struct rb_node *n;
1180 
1181                 dout("osd addr hasn't changed and connection never opened, "
1182                      "letting msgr retry\n");
1183                 /* touch each r_stamp for handle_timeout()'s benfit */
1184                 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
1185                         struct ceph_osd_request *req =
1186                             rb_entry(n, struct ceph_osd_request, r_node);
1187                         req->r_stamp = jiffies;
1188                 }
1189 
1190                 return -EAGAIN;
1191         }
1192 
1193         ceph_con_close(&osd->o_con);
1194         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1195         osd->o_incarnation++;
1196 
1197         return 0;
1198 }
1199 
1200 static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
1201                                           bool wrlocked)
1202 {
1203         struct ceph_osd *osd;
1204 
1205         if (wrlocked)
1206                 verify_osdc_wrlocked(osdc);
1207         else
1208                 verify_osdc_locked(osdc);
1209 
1210         if (o != CEPH_HOMELESS_OSD)
1211                 osd = lookup_osd(&osdc->osds, o);
1212         else
1213                 osd = &osdc->homeless_osd;
1214         if (!osd) {
1215                 if (!wrlocked)
1216                         return ERR_PTR(-EAGAIN);
1217 
1218                 osd = create_osd(osdc, o);
1219                 insert_osd(&osdc->osds, osd);
1220                 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
1221                               &osdc->osdmap->osd_addr[osd->o_osd]);
1222         }
1223 
1224         dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
1225         return osd;
1226 }
1227 
1228 /*
1229  * Create request <-> OSD session relation.
1230  *
1231  * @req has to be assigned a tid, @osd may be homeless.
1232  */
1233 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1234 {
1235         verify_osd_locked(osd);
1236         WARN_ON(!req->r_tid || req->r_osd);
1237         dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1238              req, req->r_tid);
1239 
1240         if (!osd_homeless(osd))
1241                 __remove_osd_from_lru(osd);
1242         else
1243                 atomic_inc(&osd->o_osdc->num_homeless);
1244 
1245         get_osd(osd);
1246         insert_request(&osd->o_requests, req);
1247         req->r_osd = osd;
1248 }
1249 
1250 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1251 {
1252         verify_osd_locked(osd);
1253         WARN_ON(req->r_osd != osd);
1254         dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1255              req, req->r_tid);
1256 
1257         req->r_osd = NULL;
1258         erase_request(&osd->o_requests, req);
1259         put_osd(osd);
1260 
1261         if (!osd_homeless(osd))
1262                 maybe_move_osd_to_lru(osd);
1263         else
1264                 atomic_dec(&osd->o_osdc->num_homeless);
1265 }
1266 
1267 static bool __pool_full(struct ceph_pg_pool_info *pi)
1268 {
1269         return pi->flags & CEPH_POOL_FLAG_FULL;
1270 }
1271 
1272 static bool have_pool_full(struct ceph_osd_client *osdc)
1273 {
1274         struct rb_node *n;
1275 
1276         for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
1277                 struct ceph_pg_pool_info *pi =
1278                     rb_entry(n, struct ceph_pg_pool_info, node);
1279 
1280                 if (__pool_full(pi))
1281                         return true;
1282         }
1283 
1284         return false;
1285 }
1286 
1287 static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
1288 {
1289         struct ceph_pg_pool_info *pi;
1290 
1291         pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
1292         if (!pi)
1293                 return false;
1294 
1295         return __pool_full(pi);
1296 }
1297 
1298 /*
1299  * Returns whether a request should be blocked from being sent
1300  * based on the current osdmap and osd_client settings.
1301  */
1302 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1303                                     const struct ceph_osd_request_target *t,
1304                                     struct ceph_pg_pool_info *pi)
1305 {
1306         bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
1307         bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
1308                        ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1309                        __pool_full(pi);
1310 
1311         WARN_ON(pi->id != t->target_oloc.pool);
1312         return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
1313                ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
1314                (osdc->osdmap->epoch < osdc->epoch_barrier);
1315 }
1316 
1317 enum calc_target_result {
1318         CALC_TARGET_NO_ACTION = 0,
1319         CALC_TARGET_NEED_RESEND,
1320         CALC_TARGET_POOL_DNE,
1321 };
1322 
1323 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1324                                            struct ceph_osd_request_target *t,
1325                                            struct ceph_connection *con,
1326                                            bool any_change)
1327 {
1328         struct ceph_pg_pool_info *pi;
1329         struct ceph_pg pgid, last_pgid;
1330         struct ceph_osds up, acting;
1331         bool force_resend = false;
1332         bool unpaused = false;
1333         bool legacy_change;
1334         bool split = false;
1335         bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1336         bool recovery_deletes = ceph_osdmap_flag(osdc,
1337                                                  CEPH_OSDMAP_RECOVERY_DELETES);
1338         enum calc_target_result ct_res;
1339         int ret;
1340 
1341         t->epoch = osdc->osdmap->epoch;
1342         pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1343         if (!pi) {
1344                 t->osd = CEPH_HOMELESS_OSD;
1345                 ct_res = CALC_TARGET_POOL_DNE;
1346                 goto out;
1347         }
1348 
1349         if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1350                 if (t->last_force_resend < pi->last_force_request_resend) {
1351                         t->last_force_resend = pi->last_force_request_resend;
1352                         force_resend = true;
1353                 } else if (t->last_force_resend == 0) {
1354                         force_resend = true;
1355                 }
1356         }
1357 
1358         /* apply tiering */
1359         ceph_oid_copy(&t->target_oid, &t->base_oid);
1360         ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1361         if ((t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1362                 if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
1363                         t->target_oloc.pool = pi->read_tier;
1364                 if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
1365                         t->target_oloc.pool = pi->write_tier;
1366 
1367                 pi = ceph_pg_pool_by_id(osdc->osdmap, t->target_oloc.pool);
1368                 if (!pi) {
1369                         t->osd = CEPH_HOMELESS_OSD;
1370                         ct_res = CALC_TARGET_POOL_DNE;
1371                         goto out;
1372                 }
1373         }
1374 
1375         ret = __ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc,
1376                                           &pgid);
1377         if (ret) {
1378                 WARN_ON(ret != -ENOENT);
1379                 t->osd = CEPH_HOMELESS_OSD;
1380                 ct_res = CALC_TARGET_POOL_DNE;
1381                 goto out;
1382         }
1383         last_pgid.pool = pgid.pool;
1384         last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1385 
1386         ceph_pg_to_up_acting_osds(osdc->osdmap, pi, &pgid, &up, &acting);
1387         if (any_change &&
1388             ceph_is_new_interval(&t->acting,
1389                                  &acting,
1390                                  &t->up,
1391                                  &up,
1392                                  t->size,
1393                                  pi->size,
1394                                  t->min_size,
1395                                  pi->min_size,
1396                                  t->pg_num,
1397                                  pi->pg_num,
1398                                  t->sort_bitwise,
1399                                  sort_bitwise,
1400                                  t->recovery_deletes,
1401                                  recovery_deletes,
1402                                  &last_pgid))
1403                 force_resend = true;
1404 
1405         if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1406                 t->paused = false;
1407                 unpaused = true;
1408         }
1409         legacy_change = ceph_pg_compare(&t->pgid, &pgid) ||
1410                         ceph_osds_changed(&t->acting, &acting, any_change);
1411         if (t->pg_num)
1412                 split = ceph_pg_is_split(&last_pgid, t->pg_num, pi->pg_num);
1413 
1414         if (legacy_change || force_resend || split) {
1415                 t->pgid = pgid; /* struct */
1416                 ceph_pg_to_primary_shard(osdc->osdmap, pi, &pgid, &t->spgid);
1417                 ceph_osds_copy(&t->acting, &acting);
1418                 ceph_osds_copy(&t->up, &up);
1419                 t->size = pi->size;
1420                 t->min_size = pi->min_size;
1421                 t->pg_num = pi->pg_num;
1422                 t->pg_num_mask = pi->pg_num_mask;
1423                 t->sort_bitwise = sort_bitwise;
1424                 t->recovery_deletes = recovery_deletes;
1425 
1426                 t->osd = acting.primary;
1427         }
1428 
1429         if (unpaused || legacy_change || force_resend ||
1430             (split && con && CEPH_HAVE_FEATURE(con->peer_features,
1431                                                RESEND_ON_SPLIT)))
1432                 ct_res = CALC_TARGET_NEED_RESEND;
1433         else
1434                 ct_res = CALC_TARGET_NO_ACTION;
1435 
1436 out:
1437         dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
1438         return ct_res;
1439 }
1440 
1441 static struct ceph_spg_mapping *alloc_spg_mapping(void)
1442 {
1443         struct ceph_spg_mapping *spg;
1444 
1445         spg = kmalloc(sizeof(*spg), GFP_NOIO);
1446         if (!spg)
1447                 return NULL;
1448 
1449         RB_CLEAR_NODE(&spg->node);
1450         spg->backoffs = RB_ROOT;
1451         return spg;
1452 }
1453 
1454 static void free_spg_mapping(struct ceph_spg_mapping *spg)
1455 {
1456         WARN_ON(!RB_EMPTY_NODE(&spg->node));
1457         WARN_ON(!RB_EMPTY_ROOT(&spg->backoffs));
1458 
1459         kfree(spg);
1460 }
1461 
1462 /*
1463  * rbtree of ceph_spg_mapping for handling map<spg_t, ...>, similar to
1464  * ceph_pg_mapping.  Used to track OSD backoffs -- a backoff [range] is
1465  * defined only within a specific spgid; it does not pass anything to
1466  * children on split, or to another primary.
1467  */
1468 DEFINE_RB_FUNCS2(spg_mapping, struct ceph_spg_mapping, spgid, ceph_spg_compare,
1469                  RB_BYPTR, const struct ceph_spg *, node)
1470 
1471 static u64 hoid_get_bitwise_key(const struct ceph_hobject_id *hoid)
1472 {
1473         return hoid->is_max ? 0x100000000ull : hoid->hash_reverse_bits;
1474 }
1475 
1476 static void hoid_get_effective_key(const struct ceph_hobject_id *hoid,
1477                                    void **pkey, size_t *pkey_len)
1478 {
1479         if (hoid->key_len) {
1480                 *pkey = hoid->key;
1481                 *pkey_len = hoid->key_len;
1482         } else {
1483                 *pkey = hoid->oid;
1484                 *pkey_len = hoid->oid_len;
1485         }
1486 }
1487 
1488 static int compare_names(const void *name1, size_t name1_len,
1489                          const void *name2, size_t name2_len)
1490 {
1491         int ret;
1492 
1493         ret = memcmp(name1, name2, min(name1_len, name2_len));
1494         if (!ret) {
1495                 if (name1_len < name2_len)
1496                         ret = -1;
1497                 else if (name1_len > name2_len)
1498                         ret = 1;
1499         }
1500         return ret;
1501 }
1502 
1503 static int hoid_compare(const struct ceph_hobject_id *lhs,
1504                         const struct ceph_hobject_id *rhs)
1505 {
1506         void *effective_key1, *effective_key2;
1507         size_t effective_key1_len, effective_key2_len;
1508         int ret;
1509 
1510         if (lhs->is_max < rhs->is_max)
1511                 return -1;
1512         if (lhs->is_max > rhs->is_max)
1513                 return 1;
1514 
1515         if (lhs->pool < rhs->pool)
1516                 return -1;
1517         if (lhs->pool > rhs->pool)
1518                 return 1;
1519 
1520         if (hoid_get_bitwise_key(lhs) < hoid_get_bitwise_key(rhs))
1521                 return -1;
1522         if (hoid_get_bitwise_key(lhs) > hoid_get_bitwise_key(rhs))
1523                 return 1;
1524 
1525         ret = compare_names(lhs->nspace, lhs->nspace_len,
1526                             rhs->nspace, rhs->nspace_len);
1527         if (ret)
1528                 return ret;
1529 
1530         hoid_get_effective_key(lhs, &effective_key1, &effective_key1_len);
1531         hoid_get_effective_key(rhs, &effective_key2, &effective_key2_len);
1532         ret = compare_names(effective_key1, effective_key1_len,
1533                             effective_key2, effective_key2_len);
1534         if (ret)
1535                 return ret;
1536 
1537         ret = compare_names(lhs->oid, lhs->oid_len, rhs->oid, rhs->oid_len);
1538         if (ret)
1539                 return ret;
1540 
1541         if (lhs->snapid < rhs->snapid)
1542                 return -1;
1543         if (lhs->snapid > rhs->snapid)
1544                 return 1;
1545 
1546         return 0;
1547 }
1548 
1549 /*
1550  * For decoding ->begin and ->end of MOSDBackoff only -- no MIN/MAX
1551  * compat stuff here.
1552  *
1553  * Assumes @hoid is zero-initialized.
1554  */
1555 static int decode_hoid(void **p, void *end, struct ceph_hobject_id *hoid)
1556 {
1557         u8 struct_v;
1558         u32 struct_len;
1559         int ret;
1560 
1561         ret = ceph_start_decoding(p, end, 4, "hobject_t", &struct_v,
1562                                   &struct_len);
1563         if (ret)
1564                 return ret;
1565 
1566         if (struct_v < 4) {
1567                 pr_err("got struct_v %d < 4 of hobject_t\n", struct_v);
1568                 goto e_inval;
1569         }
1570 
1571         hoid->key = ceph_extract_encoded_string(p, end, &hoid->key_len,
1572                                                 GFP_NOIO);
1573         if (IS_ERR(hoid->key)) {
1574                 ret = PTR_ERR(hoid->key);
1575                 hoid->key = NULL;
1576                 return ret;
1577         }
1578 
1579         hoid->oid = ceph_extract_encoded_string(p, end, &hoid->oid_len,
1580                                                 GFP_NOIO);
1581         if (IS_ERR(hoid->oid)) {
1582                 ret = PTR_ERR(hoid->oid);
1583                 hoid->oid = NULL;
1584                 return ret;
1585         }
1586 
1587         ceph_decode_64_safe(p, end, hoid->snapid, e_inval);
1588         ceph_decode_32_safe(p, end, hoid->hash, e_inval);
1589         ceph_decode_8_safe(p, end, hoid->is_max, e_inval);
1590 
1591         hoid->nspace = ceph_extract_encoded_string(p, end, &hoid->nspace_len,
1592                                                    GFP_NOIO);
1593         if (IS_ERR(hoid->nspace)) {
1594                 ret = PTR_ERR(hoid->nspace);
1595                 hoid->nspace = NULL;
1596                 return ret;
1597         }
1598 
1599         ceph_decode_64_safe(p, end, hoid->pool, e_inval);
1600 
1601         ceph_hoid_build_hash_cache(hoid);
1602         return 0;
1603 
1604 e_inval:
1605         return -EINVAL;
1606 }
1607 
1608 static int hoid_encoding_size(const struct ceph_hobject_id *hoid)
1609 {
1610         return 8 + 4 + 1 + 8 + /* snapid, hash, is_max, pool */
1611                4 + hoid->key_len + 4 + hoid->oid_len + 4 + hoid->nspace_len;
1612 }
1613 
1614 static void encode_hoid(void **p, void *end, const struct ceph_hobject_id *hoid)
1615 {
1616         ceph_start_encoding(p, 4, 3, hoid_encoding_size(hoid));
1617         ceph_encode_string(p, end, hoid->key, hoid->key_len);
1618         ceph_encode_string(p, end, hoid->oid, hoid->oid_len);
1619         ceph_encode_64(p, hoid->snapid);
1620         ceph_encode_32(p, hoid->hash);
1621         ceph_encode_8(p, hoid->is_max);
1622         ceph_encode_string(p, end, hoid->nspace, hoid->nspace_len);
1623         ceph_encode_64(p, hoid->pool);
1624 }
1625 
1626 static void free_hoid(struct ceph_hobject_id *hoid)
1627 {
1628         if (hoid) {
1629                 kfree(hoid->key);
1630                 kfree(hoid->oid);
1631                 kfree(hoid->nspace);
1632                 kfree(hoid);
1633         }
1634 }
1635 
1636 static struct ceph_osd_backoff *alloc_backoff(void)
1637 {
1638         struct ceph_osd_backoff *backoff;
1639 
1640         backoff = kzalloc(sizeof(*backoff), GFP_NOIO);
1641         if (!backoff)
1642                 return NULL;
1643 
1644         RB_CLEAR_NODE(&backoff->spg_node);
1645         RB_CLEAR_NODE(&backoff->id_node);
1646         return backoff;
1647 }
1648 
1649 static void free_backoff(struct ceph_osd_backoff *backoff)
1650 {
1651         WARN_ON(!RB_EMPTY_NODE(&backoff->spg_node));
1652         WARN_ON(!RB_EMPTY_NODE(&backoff->id_node));
1653 
1654         free_hoid(backoff->begin);
1655         free_hoid(backoff->end);
1656         kfree(backoff);
1657 }
1658 
1659 /*
1660  * Within a specific spgid, backoffs are managed by ->begin hoid.
1661  */
1662 DEFINE_RB_INSDEL_FUNCS2(backoff, struct ceph_osd_backoff, begin, hoid_compare,
1663                         RB_BYVAL, spg_node);
1664 
1665 static struct ceph_osd_backoff *lookup_containing_backoff(struct rb_root *root,
1666                                             const struct ceph_hobject_id *hoid)
1667 {
1668         struct rb_node *n = root->rb_node;
1669 
1670         while (n) {
1671                 struct ceph_osd_backoff *cur =
1672                     rb_entry(n, struct ceph_osd_backoff, spg_node);
1673                 int cmp;
1674 
1675                 cmp = hoid_compare(hoid, cur->begin);
1676                 if (cmp < 0) {
1677                         n = n->rb_left;
1678                 } else if (cmp > 0) {
1679                         if (hoid_compare(hoid, cur->end) < 0)
1680                                 return cur;
1681 
1682                         n = n->rb_right;
1683                 } else {
1684                         return cur;
1685                 }
1686         }
1687 
1688         return NULL;
1689 }
1690 
1691 /*
1692  * Each backoff has a unique id within its OSD session.
1693  */
1694 DEFINE_RB_FUNCS(backoff_by_id, struct ceph_osd_backoff, id, id_node)
1695 
1696 static void clear_backoffs(struct ceph_osd *osd)
1697 {
1698         while (!RB_EMPTY_ROOT(&osd->o_backoff_mappings)) {
1699                 struct ceph_spg_mapping *spg =
1700                     rb_entry(rb_first(&osd->o_backoff_mappings),
1701                              struct ceph_spg_mapping, node);
1702 
1703                 while (!RB_EMPTY_ROOT(&spg->backoffs)) {
1704                         struct ceph_osd_backoff *backoff =
1705                             rb_entry(rb_first(&spg->backoffs),
1706                                      struct ceph_osd_backoff, spg_node);
1707 
1708                         erase_backoff(&spg->backoffs, backoff);
1709                         erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
1710                         free_backoff(backoff);
1711                 }
1712                 erase_spg_mapping(&osd->o_backoff_mappings, spg);
1713                 free_spg_mapping(spg);
1714         }
1715 }
1716 
1717 /*
1718  * Set up a temporary, non-owning view into @t.
1719  */
1720 static void hoid_fill_from_target(struct ceph_hobject_id *hoid,
1721                                   const struct ceph_osd_request_target *t)
1722 {
1723         hoid->key = NULL;
1724         hoid->key_len = 0;
1725         hoid->oid = t->target_oid.name;
1726         hoid->oid_len = t->target_oid.name_len;
1727         hoid->snapid = CEPH_NOSNAP;
1728         hoid->hash = t->pgid.seed;
1729         hoid->is_max = false;
1730         if (t->target_oloc.pool_ns) {
1731                 hoid->nspace = t->target_oloc.pool_ns->str;
1732                 hoid->nspace_len = t->target_oloc.pool_ns->len;
1733         } else {
1734                 hoid->nspace = NULL;
1735                 hoid->nspace_len = 0;
1736         }
1737         hoid->pool = t->target_oloc.pool;
1738         ceph_hoid_build_hash_cache(hoid);
1739 }
1740 
1741 static bool should_plug_request(struct ceph_osd_request *req)
1742 {
1743         struct ceph_osd *osd = req->r_osd;
1744         struct ceph_spg_mapping *spg;
1745         struct ceph_osd_backoff *backoff;
1746         struct ceph_hobject_id hoid;
1747 
1748         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &req->r_t.spgid);
1749         if (!spg)
1750                 return false;
1751 
1752         hoid_fill_from_target(&hoid, &req->r_t);
1753         backoff = lookup_containing_backoff(&spg->backoffs, &hoid);
1754         if (!backoff)
1755                 return false;
1756 
1757         dout("%s req %p tid %llu backoff osd%d spgid %llu.%xs%d id %llu\n",
1758              __func__, req, req->r_tid, osd->o_osd, backoff->spgid.pgid.pool,
1759              backoff->spgid.pgid.seed, backoff->spgid.shard, backoff->id);
1760         return true;
1761 }
1762 
1763 static void setup_request_data(struct ceph_osd_request *req,
1764                                struct ceph_msg *msg)
1765 {
1766         u32 data_len = 0;
1767         int i;
1768 
1769         if (!list_empty(&msg->data))
1770                 return;
1771 
1772         WARN_ON(msg->data_length);
1773         for (i = 0; i < req->r_num_ops; i++) {
1774                 struct ceph_osd_req_op *op = &req->r_ops[i];
1775 
1776                 switch (op->op) {
1777                 /* request */
1778                 case CEPH_OSD_OP_WRITE:
1779                 case CEPH_OSD_OP_WRITEFULL:
1780                         WARN_ON(op->indata_len != op->extent.length);
1781                         ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
1782                         break;
1783                 case CEPH_OSD_OP_SETXATTR:
1784                 case CEPH_OSD_OP_CMPXATTR:
1785                         WARN_ON(op->indata_len != op->xattr.name_len +
1786                                                   op->xattr.value_len);
1787                         ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
1788                         break;
1789                 case CEPH_OSD_OP_NOTIFY_ACK:
1790                         ceph_osdc_msg_data_add(msg,
1791                                                &op->notify_ack.request_data);
1792                         break;
1793 
1794                 /* reply */
1795                 case CEPH_OSD_OP_STAT:
1796                         ceph_osdc_msg_data_add(req->r_reply,
1797                                                &op->raw_data_in);
1798                         break;
1799                 case CEPH_OSD_OP_READ:
1800                         ceph_osdc_msg_data_add(req->r_reply,
1801                                                &op->extent.osd_data);
1802                         break;
1803                 case CEPH_OSD_OP_LIST_WATCHERS:
1804                         ceph_osdc_msg_data_add(req->r_reply,
1805                                                &op->list_watchers.response_data);
1806                         break;
1807 
1808                 /* both */
1809                 case CEPH_OSD_OP_CALL:
1810                         WARN_ON(op->indata_len != op->cls.class_len +
1811                                                   op->cls.method_len +
1812                                                   op->cls.indata_len);
1813                         ceph_osdc_msg_data_add(msg, &op->cls.request_info);
1814                         /* optional, can be NONE */
1815                         ceph_osdc_msg_data_add(msg, &op->cls.request_data);
1816                         /* optional, can be NONE */
1817                         ceph_osdc_msg_data_add(req->r_reply,
1818                                                &op->cls.response_data);
1819                         break;
1820                 case CEPH_OSD_OP_NOTIFY:
1821                         ceph_osdc_msg_data_add(msg,
1822                                                &op->notify.request_data);
1823                         ceph_osdc_msg_data_add(req->r_reply,
1824                                                &op->notify.response_data);
1825                         break;
1826                 }
1827 
1828                 data_len += op->indata_len;
1829         }
1830 
1831         WARN_ON(data_len != msg->data_length);
1832 }
1833 
1834 static void encode_pgid(void **p, const struct ceph_pg *pgid)
1835 {
1836         ceph_encode_8(p, 1);
1837         ceph_encode_64(p, pgid->pool);
1838         ceph_encode_32(p, pgid->seed);
1839         ceph_encode_32(p, -1); /* preferred */
1840 }
1841 
1842 static void encode_spgid(void **p, const struct ceph_spg *spgid)
1843 {
1844         ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
1845         encode_pgid(p, &spgid->pgid);
1846         ceph_encode_8(p, spgid->shard);
1847 }
1848 
1849 static void encode_oloc(void **p, void *end,
1850                         const struct ceph_object_locator *oloc)
1851 {
1852         ceph_start_encoding(p, 5, 4, ceph_oloc_encoding_size(oloc));
1853         ceph_encode_64(p, oloc->pool);
1854         ceph_encode_32(p, -1); /* preferred */
1855         ceph_encode_32(p, 0);  /* key len */
1856         if (oloc->pool_ns)
1857                 ceph_encode_string(p, end, oloc->pool_ns->str,
1858                                    oloc->pool_ns->len);
1859         else
1860                 ceph_encode_32(p, 0);
1861 }
1862 
1863 static void encode_request_partial(struct ceph_osd_request *req,
1864                                    struct ceph_msg *msg)
1865 {
1866         void *p = msg->front.iov_base;
1867         void *const end = p + msg->front_alloc_len;
1868         u32 data_len = 0;
1869         int i;
1870 
1871         if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
1872                 /* snapshots aren't writeable */
1873                 WARN_ON(req->r_snapid != CEPH_NOSNAP);
1874         } else {
1875                 WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
1876                         req->r_data_offset || req->r_snapc);
1877         }
1878 
1879         setup_request_data(req, msg);
1880 
1881         encode_spgid(&p, &req->r_t.spgid); /* actual spg */
1882         ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */
1883         ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
1884         ceph_encode_32(&p, req->r_flags);
1885 
1886         /* reqid */
1887         ceph_start_encoding(&p, 2, 2, sizeof(struct ceph_osd_reqid));
1888         memset(p, 0, sizeof(struct ceph_osd_reqid));
1889         p += sizeof(struct ceph_osd_reqid);
1890 
1891         /* trace */
1892         memset(p, 0, sizeof(struct ceph_blkin_trace_info));
1893         p += sizeof(struct ceph_blkin_trace_info);
1894 
1895         ceph_encode_32(&p, 0); /* client_inc, always 0 */
1896         ceph_encode_timespec(p, &req->r_mtime);
1897         p += sizeof(struct ceph_timespec);
1898 
1899         encode_oloc(&p, end, &req->r_t.target_oloc);
1900         ceph_encode_string(&p, end, req->r_t.target_oid.name,
1901                            req->r_t.target_oid.name_len);
1902 
1903         /* ops, can imply data */
1904         ceph_encode_16(&p, req->r_num_ops);
1905         for (i = 0; i < req->r_num_ops; i++) {
1906                 data_len += osd_req_encode_op(p, &req->r_ops[i]);
1907                 p += sizeof(struct ceph_osd_op);
1908         }
1909 
1910         ceph_encode_64(&p, req->r_snapid); /* snapid */
1911         if (req->r_snapc) {
1912                 ceph_encode_64(&p, req->r_snapc->seq);
1913                 ceph_encode_32(&p, req->r_snapc->num_snaps);
1914                 for (i = 0; i < req->r_snapc->num_snaps; i++)
1915                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
1916         } else {
1917                 ceph_encode_64(&p, 0); /* snap_seq */
1918                 ceph_encode_32(&p, 0); /* snaps len */
1919         }
1920 
1921         ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
1922         BUG_ON(p > end - 8); /* space for features */
1923 
1924         msg->hdr.version = cpu_to_le16(8); /* MOSDOp v8 */
1925         /* front_len is finalized in encode_request_finish() */
1926         msg->front.iov_len = p - msg->front.iov_base;
1927         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1928         msg->hdr.data_len = cpu_to_le32(data_len);
1929         /*
1930          * The header "data_off" is a hint to the receiver allowing it
1931          * to align received data into its buffers such that there's no
1932          * need to re-copy it before writing it to disk (direct I/O).
1933          */
1934         msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
1935 
1936         dout("%s req %p msg %p oid %s oid_len %d\n", __func__, req, msg,
1937              req->r_t.target_oid.name, req->r_t.target_oid.name_len);
1938 }
1939 
1940 static void encode_request_finish(struct ceph_msg *msg)
1941 {
1942         void *p = msg->front.iov_base;
1943         void *const partial_end = p + msg->front.iov_len;
1944         void *const end = p + msg->front_alloc_len;
1945 
1946         if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {
1947                 /* luminous OSD -- encode features and be done */
1948                 p = partial_end;
1949                 ceph_encode_64(&p, msg->con->peer_features);
1950         } else {
1951                 struct {
1952                         char spgid[CEPH_ENCODING_START_BLK_LEN +
1953                                    CEPH_PGID_ENCODING_LEN + 1];
1954                         __le32 hash;
1955                         __le32 epoch;
1956                         __le32 flags;
1957                         char reqid[CEPH_ENCODING_START_BLK_LEN +
1958                                    sizeof(struct ceph_osd_reqid)];
1959                         char trace[sizeof(struct ceph_blkin_trace_info)];
1960                         __le32 client_inc;
1961                         struct ceph_timespec mtime;
1962                 } __packed head;
1963                 struct ceph_pg pgid;
1964                 void *oloc, *oid, *tail;
1965                 int oloc_len, oid_len, tail_len;
1966                 int len;
1967 
1968                 /*
1969                  * Pre-luminous OSD -- reencode v8 into v4 using @head
1970                  * as a temporary buffer.  Encode the raw PG; the rest
1971                  * is just a matter of moving oloc, oid and tail blobs
1972                  * around.
1973                  */
1974                 memcpy(&head, p, sizeof(head));
1975                 p += sizeof(head);
1976 
1977                 oloc = p;
1978                 p += CEPH_ENCODING_START_BLK_LEN;
1979                 pgid.pool = ceph_decode_64(&p);
1980                 p += 4 + 4; /* preferred, key len */
1981                 len = ceph_decode_32(&p);
1982                 p += len;   /* nspace */
1983                 oloc_len = p - oloc;
1984 
1985                 oid = p;
1986                 len = ceph_decode_32(&p);
1987                 p += len;
1988                 oid_len = p - oid;
1989 
1990                 tail = p;
1991                 tail_len = partial_end - p;
1992 
1993                 p = msg->front.iov_base;
1994                 ceph_encode_copy(&p, &head.client_inc, sizeof(head.client_inc));
1995                 ceph_encode_copy(&p, &head.epoch, sizeof(head.epoch));
1996                 ceph_encode_copy(&p, &head.flags, sizeof(head.flags));
1997                 ceph_encode_copy(&p, &head.mtime, sizeof(head.mtime));
1998 
1999                 /* reassert_version */
2000                 memset(p, 0, sizeof(struct ceph_eversion));
2001                 p += sizeof(struct ceph_eversion);
2002 
2003                 BUG_ON(p >= oloc);
2004                 memmove(p, oloc, oloc_len);
2005                 p += oloc_len;
2006 
2007                 pgid.seed = le32_to_cpu(head.hash);
2008                 encode_pgid(&p, &pgid); /* raw pg */
2009 
2010                 BUG_ON(p >= oid);
2011                 memmove(p, oid, oid_len);
2012                 p += oid_len;
2013 
2014                 /* tail -- ops, snapid, snapc, retry_attempt */
2015                 BUG_ON(p >= tail);
2016                 memmove(p, tail, tail_len);
2017                 p += tail_len;
2018 
2019                 msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
2020         }
2021 
2022         BUG_ON(p > end);
2023         msg->front.iov_len = p - msg->front.iov_base;
2024         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2025 
2026         dout("%s msg %p tid %llu %u+%u+%u v%d\n", __func__, msg,
2027              le64_to_cpu(msg->hdr.tid), le32_to_cpu(msg->hdr.front_len),
2028              le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len),
2029              le16_to_cpu(msg->hdr.version));
2030 }
2031 
2032 /*
2033  * @req has to be assigned a tid and registered.
2034  */
2035 static void send_request(struct ceph_osd_request *req)
2036 {
2037         struct ceph_osd *osd = req->r_osd;
2038 
2039         verify_osd_locked(osd);
2040         WARN_ON(osd->o_osd != req->r_t.osd);
2041 
2042         /* backoff? */
2043         if (should_plug_request(req))
2044                 return;
2045 
2046         /*
2047          * We may have a previously queued request message hanging
2048          * around.  Cancel it to avoid corrupting the msgr.
2049          */
2050         if (req->r_sent)
2051                 ceph_msg_revoke(req->r_request);
2052 
2053         req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
2054         if (req->r_attempts)
2055                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2056         else
2057                 WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);
2058 
2059         encode_request_partial(req, req->r_request);
2060 
2061         dout("%s req %p tid %llu to pgid %llu.%x spgid %llu.%xs%d osd%d e%u flags 0x%x attempt %d\n",
2062              __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
2063              req->r_t.spgid.pgid.pool, req->r_t.spgid.pgid.seed,
2064              req->r_t.spgid.shard, osd->o_osd, req->r_t.epoch, req->r_flags,
2065              req->r_attempts);
2066 
2067         req->r_t.paused = false;
2068         req->r_stamp = jiffies;
2069         req->r_attempts++;
2070 
2071         req->r_sent = osd->o_incarnation;
2072         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
2073         ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
2074 }
2075 
2076 static void maybe_request_map(struct ceph_osd_client *osdc)
2077 {
2078         bool continuous = false;
2079 
2080         verify_osdc_locked(osdc);
2081         WARN_ON(!osdc->osdmap->epoch);
2082 
2083         if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2084             ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
2085             ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2086                 dout("%s osdc %p continuous\n", __func__, osdc);
2087                 continuous = true;
2088         } else {
2089                 dout("%s osdc %p onetime\n", __func__, osdc);
2090         }
2091 
2092         if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2093                                osdc->osdmap->epoch + 1, continuous))
2094                 ceph_monc_renew_subs(&osdc->client->monc);
2095 }
2096 
2097 static void complete_request(struct ceph_osd_request *req, int err);
2098 static void send_map_check(struct ceph_osd_request *req);
2099 
2100 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
2101 {
2102         struct ceph_osd_client *osdc = req->r_osdc;
2103         struct ceph_osd *osd;
2104         enum calc_target_result ct_res;
2105         bool need_send = false;
2106         bool promoted = false;
2107         bool need_abort = false;
2108 
2109         WARN_ON(req->r_tid);
2110         dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
2111 
2112 again:
2113         ct_res = calc_target(osdc, &req->r_t, NULL, false);
2114         if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
2115                 goto promote;
2116 
2117         osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
2118         if (IS_ERR(osd)) {
2119                 WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
2120                 goto promote;
2121         }
2122 
2123         if (osdc->osdmap->epoch < osdc->epoch_barrier) {
2124                 dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
2125                      osdc->epoch_barrier);
2126                 req->r_t.paused = true;
2127                 maybe_request_map(osdc);
2128         } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2129                    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2130                 dout("req %p pausewr\n", req);
2131                 req->r_t.paused = true;
2132                 maybe_request_map(osdc);
2133         } else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
2134                    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2135                 dout("req %p pauserd\n", req);
2136                 req->r_t.paused = true;
2137                 maybe_request_map(osdc);
2138         } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2139                    !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
2140                                      CEPH_OSD_FLAG_FULL_FORCE)) &&
2141                    (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2142                     pool_full(osdc, req->r_t.base_oloc.pool))) {
2143                 dout("req %p full/pool_full\n", req);
2144                 pr_warn_ratelimited("FULL or reached pool quota\n");
2145                 req->r_t.paused = true;
2146                 maybe_request_map(osdc);
2147                 if (req->r_abort_on_full)
2148                         need_abort = true;
2149         } else if (!osd_homeless(osd)) {
2150                 need_send = true;
2151         } else {
2152                 maybe_request_map(osdc);
2153         }
2154 
2155         mutex_lock(&osd->lock);
2156         /*
2157          * Assign the tid atomically with send_request() to protect
2158          * multiple writes to the same object from racing with each
2159          * other, resulting in out of order ops on the OSDs.
2160          */
2161         req->r_tid = atomic64_inc_return(&osdc->last_tid);
2162         link_request(osd, req);
2163         if (need_send)
2164                 send_request(req);
2165         else if (need_abort)
2166                 complete_request(req, -ENOSPC);
2167         mutex_unlock(&osd->lock);
2168 
2169         if (ct_res == CALC_TARGET_POOL_DNE)
2170                 send_map_check(req);
2171 
2172         if (promoted)
2173                 downgrade_write(&osdc->lock);
2174         return;
2175 
2176 promote:
2177         up_read(&osdc->lock);
2178         down_write(&osdc->lock);
2179         wrlocked = true;
2180         promoted = true;
2181         goto again;
2182 }
2183 
2184 static void account_request(struct ceph_osd_request *req)
2185 {
2186         WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
2187         WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
2188 
2189         req->r_flags |= CEPH_OSD_FLAG_ONDISK;
2190         atomic_inc(&req->r_osdc->num_requests);
2191 
2192         req->r_start_stamp = jiffies;
2193 }
2194 
2195 static void submit_request(struct ceph_osd_request *req, bool wrlocked)
2196 {
2197         ceph_osdc_get_request(req);
2198         account_request(req);
2199         __submit_request(req, wrlocked);
2200 }
2201 
2202 static void finish_request(struct ceph_osd_request *req)
2203 {
2204         struct ceph_osd_client *osdc = req->r_osdc;
2205 
2206         WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
2207         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2208 
2209         if (req->r_osd)
2210                 unlink_request(req->r_osd, req);
2211         atomic_dec(&osdc->num_requests);
2212 
2213         /*
2214          * If an OSD has failed or returned and a request has been sent
2215          * twice, it's possible to get a reply and end up here while the
2216          * request message is queued for delivery.  We will ignore the
2217          * reply, so not a big deal, but better to try and catch it.
2218          */
2219         ceph_msg_revoke(req->r_request);
2220         ceph_msg_revoke_incoming(req->r_reply);
2221 }
2222 
2223 static void __complete_request(struct ceph_osd_request *req)
2224 {
2225         if (req->r_callback) {
2226                 dout("%s req %p tid %llu cb %pf result %d\n", __func__, req,
2227                      req->r_tid, req->r_callback, req->r_result);
2228                 req->r_callback(req);
2229         }
2230 }
2231 
2232 /*
2233  * This is open-coded in handle_reply().
2234  */
2235 static void complete_request(struct ceph_osd_request *req, int err)
2236 {
2237         dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2238 
2239         req->r_result = err;
2240         finish_request(req);
2241         __complete_request(req);
2242         complete_all(&req->r_completion);
2243         ceph_osdc_put_request(req);
2244 }
2245 
2246 static void cancel_map_check(struct ceph_osd_request *req)
2247 {
2248         struct ceph_osd_client *osdc = req->r_osdc;
2249         struct ceph_osd_request *lookup_req;
2250 
2251         verify_osdc_wrlocked(osdc);
2252 
2253         lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2254         if (!lookup_req)
2255                 return;
2256 
2257         WARN_ON(lookup_req != req);
2258         erase_request_mc(&osdc->map_checks, req);
2259         ceph_osdc_put_request(req);
2260 }
2261 
2262 static void cancel_request(struct ceph_osd_request *req)
2263 {
2264         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2265 
2266         cancel_map_check(req);
2267         finish_request(req);
2268         complete_all(&req->r_completion);
2269         ceph_osdc_put_request(req);
2270 }
2271 
2272 static void abort_request(struct ceph_osd_request *req, int err)
2273 {
2274         dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2275 
2276         cancel_map_check(req);
2277         complete_request(req, err);
2278 }
2279 
2280 static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2281 {
2282         if (likely(eb > osdc->epoch_barrier)) {
2283                 dout("updating epoch_barrier from %u to %u\n",
2284                                 osdc->epoch_barrier, eb);
2285                 osdc->epoch_barrier = eb;
2286                 /* Request map if we're not to the barrier yet */
2287                 if (eb > osdc->osdmap->epoch)
2288                         maybe_request_map(osdc);
2289         }
2290 }
2291 
2292 void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2293 {
2294         down_read(&osdc->lock);
2295         if (unlikely(eb > osdc->epoch_barrier)) {
2296                 up_read(&osdc->lock);
2297                 down_write(&osdc->lock);
2298                 update_epoch_barrier(osdc, eb);
2299                 up_write(&osdc->lock);
2300         } else {
2301                 up_read(&osdc->lock);
2302         }
2303 }
2304 EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);
2305 
2306 /*
2307  * Drop all pending requests that are stalled waiting on a full condition to
2308  * clear, and complete them with ENOSPC as the return code. Set the
2309  * osdc->epoch_barrier to the latest map epoch that we've seen if any were
2310  * cancelled.
2311  */
2312 static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
2313 {
2314         struct rb_node *n;
2315         bool victims = false;
2316 
2317         dout("enter abort_on_full\n");
2318 
2319         if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
2320                 goto out;
2321 
2322         /* Scan list and see if there is anything to abort */
2323         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2324                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2325                 struct rb_node *m;
2326 
2327                 m = rb_first(&osd->o_requests);
2328                 while (m) {
2329                         struct ceph_osd_request *req = rb_entry(m,
2330                                         struct ceph_osd_request, r_node);
2331                         m = rb_next(m);
2332 
2333                         if (req->r_abort_on_full) {
2334                                 victims = true;
2335                                 break;
2336                         }
2337                 }
2338                 if (victims)
2339                         break;
2340         }
2341 
2342         if (!victims)
2343                 goto out;
2344 
2345         /*
2346          * Update the barrier to current epoch if it's behind that point,
2347          * since we know we have some calls to be aborted in the tree.
2348          */
2349         update_epoch_barrier(osdc, osdc->osdmap->epoch);
2350 
2351         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
2352                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
2353                 struct rb_node *m;
2354 
2355                 m = rb_first(&osd->o_requests);
2356                 while (m) {
2357                         struct ceph_osd_request *req = rb_entry(m,
2358                                         struct ceph_osd_request, r_node);
2359                         m = rb_next(m);
2360 
2361                         if (req->r_abort_on_full &&
2362                             (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2363                              pool_full(osdc, req->r_t.target_oloc.pool)))
2364                                 abort_request(req, -ENOSPC);
2365                 }
2366         }
2367 out:
2368         dout("return abort_on_full barrier=%u\n", osdc->epoch_barrier);
2369 }
2370 
2371 static void check_pool_dne(struct ceph_osd_request *req)
2372 {
2373         struct ceph_osd_client *osdc = req->r_osdc;
2374         struct ceph_osdmap *map = osdc->osdmap;
2375 
2376         verify_osdc_wrlocked(osdc);
2377         WARN_ON(!map->epoch);
2378 
2379         if (req->r_attempts) {
2380                 /*
2381                  * We sent a request earlier, which means that
2382                  * previously the pool existed, and now it does not
2383                  * (i.e., it was deleted).
2384                  */
2385                 req->r_map_dne_bound = map->epoch;
2386                 dout("%s req %p tid %llu pool disappeared\n", __func__, req,
2387                      req->r_tid);
2388         } else {
2389                 dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
2390                      req, req->r_tid, req->r_map_dne_bound, map->epoch);
2391         }
2392 
2393         if (req->r_map_dne_bound) {
2394                 if (map->epoch >= req->r_map_dne_bound) {
2395                         /* we had a new enough map */
2396                         pr_info_ratelimited("tid %llu pool does not exist\n",
2397                                             req->r_tid);
2398                         complete_request(req, -ENOENT);
2399                 }
2400         } else {
2401                 send_map_check(req);
2402         }
2403 }
2404 
2405 static void map_check_cb(struct ceph_mon_generic_request *greq)
2406 {
2407         struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2408         struct ceph_osd_request *req;
2409         u64 tid = greq->private_data;
2410 
2411         WARN_ON(greq->result || !greq->u.newest);
2412 
2413         down_write(&osdc->lock);
2414         req = lookup_request_mc(&osdc->map_checks, tid);
2415         if (!req) {
2416                 dout("%s tid %llu dne\n", __func__, tid);
2417                 goto out_unlock;
2418         }
2419 
2420         dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
2421              req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
2422         if (!req->r_map_dne_bound)
2423                 req->r_map_dne_bound = greq->u.newest;
2424         erase_request_mc(&osdc->map_checks, req);
2425         check_pool_dne(req);
2426 
2427         ceph_osdc_put_request(req);
2428 out_unlock:
2429         up_write(&osdc->lock);
2430 }
2431 
2432 static void send_map_check(struct ceph_osd_request *req)
2433 {
2434         struct ceph_osd_client *osdc = req->r_osdc;
2435         struct ceph_osd_request *lookup_req;
2436         int ret;
2437 
2438         verify_osdc_wrlocked(osdc);
2439 
2440         lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2441         if (lookup_req) {
2442                 WARN_ON(lookup_req != req);
2443                 return;
2444         }
2445 
2446         ceph_osdc_get_request(req);
2447         insert_request_mc(&osdc->map_checks, req);
2448         ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
2449                                           map_check_cb, req->r_tid);
2450         WARN_ON(ret);
2451 }
2452 
2453 /*
2454  * lingering requests, watch/notify v2 infrastructure
2455  */
2456 static void linger_release(struct kref *kref)
2457 {
2458         struct ceph_osd_linger_request *lreq =
2459             container_of(kref, struct ceph_osd_linger_request, kref);
2460 
2461         dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
2462              lreq->reg_req, lreq->ping_req);
2463         WARN_ON(!RB_EMPTY_NODE(&lreq->node));
2464         WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
2465         WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
2466         WARN_ON(!list_empty(&lreq->scan_item));
2467         WARN_ON(!list_empty(&lreq->pending_lworks));
2468         WARN_ON(lreq->osd);
2469 
2470         if (lreq->reg_req)
2471                 ceph_osdc_put_request(lreq->reg_req);
2472         if (lreq->ping_req)
2473                 ceph_osdc_put_request(lreq->ping_req);
2474         target_destroy(&lreq->t);
2475         kfree(lreq);
2476 }
2477 
2478 static void linger_put(struct ceph_osd_linger_request *lreq)
2479 {
2480         if (lreq)
2481                 kref_put(&lreq->kref, linger_release);
2482 }
2483 
2484 static struct ceph_osd_linger_request *
2485 linger_get(struct ceph_osd_linger_request *lreq)
2486 {
2487         kref_get(&lreq->kref);
2488         return lreq;
2489 }
2490 
2491 static struct ceph_osd_linger_request *
2492 linger_alloc(struct ceph_osd_client *osdc)
2493 {
2494         struct ceph_osd_linger_request *lreq;
2495 
2496         lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
2497         if (!lreq)
2498                 return NULL;
2499 
2500         kref_init(&lreq->kref);
2501         mutex_init(&lreq->lock);
2502         RB_CLEAR_NODE(&lreq->node);
2503         RB_CLEAR_NODE(&lreq->osdc_node);
2504         RB_CLEAR_NODE(&lreq->mc_node);
2505         INIT_LIST_HEAD(&lreq->scan_item);
2506         INIT_LIST_HEAD(&lreq->pending_lworks);
2507         init_completion(&lreq->reg_commit_wait);
2508         init_completion(&lreq->notify_finish_wait);
2509 
2510         lreq->osdc = osdc;
2511         target_init(&lreq->t);
2512 
2513         dout("%s lreq %p\n", __func__, lreq);
2514         return lreq;
2515 }
2516 
2517 DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
2518 DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
2519 DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
2520 
2521 /*
2522  * Create linger request <-> OSD session relation.
2523  *
2524  * @lreq has to be registered, @osd may be homeless.
2525  */
2526 static void link_linger(struct ceph_osd *osd,
2527                         struct ceph_osd_linger_request *lreq)
2528 {
2529         verify_osd_locked(osd);
2530         WARN_ON(!lreq->linger_id || lreq->osd);
2531         dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2532              osd->o_osd, lreq, lreq->linger_id);
2533 
2534         if (!osd_homeless(osd))
2535                 __remove_osd_from_lru(osd);
2536         else
2537                 atomic_inc(&osd->o_osdc->num_homeless);
2538 
2539         get_osd(osd);
2540         insert_linger(&osd->o_linger_requests, lreq);
2541         lreq->osd = osd;
2542 }
2543 
2544 static void unlink_linger(struct ceph_osd *osd,
2545                           struct ceph_osd_linger_request *lreq)
2546 {
2547         verify_osd_locked(osd);
2548         WARN_ON(lreq->osd != osd);
2549         dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2550              osd->o_osd, lreq, lreq->linger_id);
2551 
2552         lreq->osd = NULL;
2553         erase_linger(&osd->o_linger_requests, lreq);
2554         put_osd(osd);
2555 
2556         if (!osd_homeless(osd))
2557                 maybe_move_osd_to_lru(osd);
2558         else
2559                 atomic_dec(&osd->o_osdc->num_homeless);
2560 }
2561 
2562 static bool __linger_registered(struct ceph_osd_linger_request *lreq)
2563 {
2564         verify_osdc_locked(lreq->osdc);
2565 
2566         return !RB_EMPTY_NODE(&lreq->osdc_node);
2567 }
2568 
2569 static bool linger_registered(struct ceph_osd_linger_request *lreq)
2570 {
2571         struct ceph_osd_client *osdc = lreq->osdc;
2572         bool registered;
2573 
2574         down_read(&osdc->lock);
2575         registered = __linger_registered(lreq);
2576         up_read(&osdc->lock);
2577 
2578         return registered;
2579 }
2580 
2581 static void linger_register(struct ceph_osd_linger_request *lreq)
2582 {
2583         struct ceph_osd_client *osdc = lreq->osdc;
2584 
2585         verify_osdc_wrlocked(osdc);
2586         WARN_ON(lreq->linger_id);
2587 
2588         linger_get(lreq);
2589         lreq->linger_id = ++osdc->last_linger_id;
2590         insert_linger_osdc(&osdc->linger_requests, lreq);
2591 }
2592 
2593 static void linger_unregister(struct ceph_osd_linger_request *lreq)
2594 {
2595         struct ceph_osd_client *osdc = lreq->osdc;
2596 
2597         verify_osdc_wrlocked(osdc);
2598 
2599         erase_linger_osdc(&osdc->linger_requests, lreq);
2600         linger_put(lreq);
2601 }
2602 
2603 static void cancel_linger_request(struct ceph_osd_request *req)
2604 {
2605         struct ceph_osd_linger_request *lreq = req->r_priv;
2606 
2607         WARN_ON(!req->r_linger);
2608         cancel_request(req);
2609         linger_put(lreq);
2610 }
2611 
2612 struct linger_work {
2613         struct work_struct work;
2614         struct ceph_osd_linger_request *lreq;
2615         struct list_head pending_item;
2616         unsigned long queued_stamp;
2617 
2618         union {
2619                 struct {
2620                         u64 notify_id;
2621                         u64 notifier_id;
2622                         void *payload; /* points into @msg front */
2623                         size_t payload_len;
2624 
2625                         struct ceph_msg *msg; /* for ceph_msg_put() */
2626                 } notify;
2627                 struct {
2628                         int err;
2629                 } error;
2630         };
2631 };
2632 
2633 static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
2634                                        work_func_t workfn)
2635 {
2636         struct linger_work *lwork;
2637 
2638         lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
2639         if (!lwork)
2640                 return NULL;
2641 
2642         INIT_WORK(&lwork->work, workfn);
2643         INIT_LIST_HEAD(&lwork->pending_item);
2644         lwork->lreq = linger_get(lreq);
2645 
2646         return lwork;
2647 }
2648 
2649 static void lwork_free(struct linger_work *lwork)
2650 {
2651         struct ceph_osd_linger_request *lreq = lwork->lreq;
2652 
2653         mutex_lock(&lreq->lock);
2654         list_del(&lwork->pending_item);
2655         mutex_unlock(&lreq->lock);
2656 
2657         linger_put(lreq);
2658         kfree(lwork);
2659 }
2660 
2661 static void lwork_queue(struct linger_work *lwork)
2662 {
2663         struct ceph_osd_linger_request *lreq = lwork->lreq;
2664         struct ceph_osd_client *osdc = lreq->osdc;
2665 
2666         verify_lreq_locked(lreq);
2667         WARN_ON(!list_empty(&lwork->pending_item));
2668 
2669         lwork->queued_stamp = jiffies;
2670         list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2671         queue_work(osdc->notify_wq, &lwork->work);
2672 }
2673 
2674 static void do_watch_notify(struct work_struct *w)
2675 {
2676         struct linger_work *lwork = container_of(w, struct linger_work, work);
2677         struct ceph_osd_linger_request *lreq = lwork->lreq;
2678 
2679         if (!linger_registered(lreq)) {
2680                 dout("%s lreq %p not registered\n", __func__, lreq);
2681                 goto out;
2682         }
2683 
2684         WARN_ON(!lreq->is_watch);
2685         dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
2686              __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
2687              lwork->notify.payload_len);
2688         lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
2689                   lwork->notify.notifier_id, lwork->notify.payload,
2690                   lwork->notify.payload_len);
2691 
2692 out:
2693         ceph_msg_put(lwork->notify.msg);
2694         lwork_free(lwork);
2695 }
2696 
2697 static void do_watch_error(struct work_struct *w)
2698 {
2699         struct linger_work *lwork = container_of(w, struct linger_work, work);
2700         struct ceph_osd_linger_request *lreq = lwork->lreq;
2701 
2702         if (!linger_registered(lreq)) {
2703                 dout("%s lreq %p not registered\n", __func__, lreq);
2704                 goto out;
2705         }
2706 
2707         dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
2708         lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);
2709 
2710 out:
2711         lwork_free(lwork);
2712 }
2713 
2714 static void queue_watch_error(struct ceph_osd_linger_request *lreq)
2715 {
2716         struct linger_work *lwork;
2717 
2718         lwork = lwork_alloc(lreq, do_watch_error);
2719         if (!lwork) {
2720                 pr_err("failed to allocate error-lwork\n");
2721                 return;
2722         }
2723 
2724         lwork->error.err = lreq->last_error;
2725         lwork_queue(lwork);
2726 }
2727 
2728 static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
2729                                        int result)
2730 {
2731         if (!completion_done(&lreq->reg_commit_wait)) {
2732                 lreq->reg_commit_error = (result <= 0 ? result : 0);
2733                 complete_all(&lreq->reg_commit_wait);
2734         }
2735 }
2736 
2737 static void linger_commit_cb(struct ceph_osd_request *req)
2738 {
2739         struct ceph_osd_linger_request *lreq = req->r_priv;
2740 
2741         mutex_lock(&lreq->lock);
2742         dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
2743              lreq->linger_id, req->r_result);
2744         linger_reg_commit_complete(lreq, req->r_result);
2745         lreq->committed = true;
2746 
2747         if (!lreq->is_watch) {
2748                 struct ceph_osd_data *osd_data =
2749                     osd_req_op_data(req, 0, notify, response_data);
2750                 void *p = page_address(osd_data->pages[0]);
2751 
2752                 WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
2753                         osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
2754 
2755                 /* make note of the notify_id */
2756                 if (req->r_ops[0].outdata_len >= sizeof(u64)) {
2757                         lreq->notify_id = ceph_decode_64(&p);
2758                         dout("lreq %p notify_id %llu\n", lreq,
2759                              lreq->notify_id);
2760                 } else {
2761                         dout("lreq %p no notify_id\n", lreq);
2762                 }
2763         }
2764 
2765         mutex_unlock(&lreq->lock);
2766         linger_put(lreq);
2767 }
2768 
2769 static int normalize_watch_error(int err)
2770 {
2771         /*
2772          * Translate ENOENT -> ENOTCONN so that a delete->disconnection
2773          * notification and a failure to reconnect because we raced with
2774          * the delete appear the same to the user.
2775          */
2776         if (err == -ENOENT)
2777                 err = -ENOTCONN;
2778 
2779         return err;
2780 }
2781 
2782 static void linger_reconnect_cb(struct ceph_osd_request *req)
2783 {
2784         struct ceph_osd_linger_request *lreq = req->r_priv;
2785 
2786         mutex_lock(&lreq->lock);
2787         dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
2788              lreq, lreq->linger_id, req->r_result, lreq->last_error);
2789         if (req->r_result < 0) {
2790                 if (!lreq->last_error) {
2791                         lreq->last_error = normalize_watch_error(req->r_result);
2792                         queue_watch_error(lreq);
2793                 }
2794         }
2795 
2796         mutex_unlock(&lreq->lock);
2797         linger_put(lreq);
2798 }
2799 
2800 static void send_linger(struct ceph_osd_linger_request *lreq)
2801 {
2802         struct ceph_osd_request *req = lreq->reg_req;
2803         struct ceph_osd_req_op *op = &req->r_ops[0];
2804 
2805         verify_osdc_wrlocked(req->r_osdc);
2806         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
2807 
2808         if (req->r_osd)
2809                 cancel_linger_request(req);
2810 
2811         request_reinit(req);
2812         ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
2813         ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
2814         req->r_flags = lreq->t.flags;
2815         req->r_mtime = lreq->mtime;
2816 
2817         mutex_lock(&lreq->lock);
2818         if (lreq->is_watch && lreq->committed) {
2819                 WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2820                         op->watch.cookie != lreq->linger_id);
2821                 op->watch.op = CEPH_OSD_WATCH_OP_RECONNECT;
2822                 op->watch.gen = ++lreq->register_gen;
2823                 dout("lreq %p reconnect register_gen %u\n", lreq,
2824                      op->watch.gen);
2825                 req->r_callback = linger_reconnect_cb;
2826         } else {
2827                 if (!lreq->is_watch)
2828                         lreq->notify_id = 0;
2829                 else
2830                         WARN_ON(op->watch.op != CEPH_OSD_WATCH_OP_WATCH);
2831                 dout("lreq %p register\n", lreq);
2832                 req->r_callback = linger_commit_cb;
2833         }
2834         mutex_unlock(&lreq->lock);
2835 
2836         req->r_priv = linger_get(lreq);
2837         req->r_linger = true;
2838 
2839         submit_request(req, true);
2840 }
2841 
2842 static void linger_ping_cb(struct ceph_osd_request *req)
2843 {
2844         struct ceph_osd_linger_request *lreq = req->r_priv;
2845 
2846         mutex_lock(&lreq->lock);
2847         dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
2848              __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
2849              lreq->last_error);
2850         if (lreq->register_gen == req->r_ops[0].watch.gen) {
2851                 if (!req->r_result) {
2852                         lreq->watch_valid_thru = lreq->ping_sent;
2853                 } else if (!lreq->last_error) {
2854                         lreq->last_error = normalize_watch_error(req->r_result);
2855                         queue_watch_error(lreq);
2856                 }
2857         } else {
2858                 dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
2859                      lreq->register_gen, req->r_ops[0].watch.gen);
2860         }
2861 
2862         mutex_unlock(&lreq->lock);
2863         linger_put(lreq);
2864 }
2865 
2866 static void send_linger_ping(struct ceph_osd_linger_request *lreq)
2867 {
2868         struct ceph_osd_client *osdc = lreq->osdc;
2869         struct ceph_osd_request *req = lreq->ping_req;
2870         struct ceph_osd_req_op *op = &req->r_ops[0];
2871 
2872         if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2873                 dout("%s PAUSERD\n", __func__);
2874                 return;
2875         }
2876 
2877         lreq->ping_sent = jiffies;
2878         dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
2879              __func__, lreq, lreq->linger_id, lreq->ping_sent,
2880              lreq->register_gen);
2881 
2882         if (req->r_osd)
2883                 cancel_linger_request(req);
2884 
2885         request_reinit(req);
2886         target_copy(&req->r_t, &lreq->t);
2887 
2888         WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
2889                 op->watch.cookie != lreq->linger_id ||
2890                 op->watch.op != CEPH_OSD_WATCH_OP_PING);
2891         op->watch.gen = lreq->register_gen;
2892         req->r_callback = linger_ping_cb;
2893         req->r_priv = linger_get(lreq);
2894         req->r_linger = true;
2895 
2896         ceph_osdc_get_request(req);
2897         account_request(req);
2898         req->r_tid = atomic64_inc_return(&osdc->last_tid);
2899         link_request(lreq->osd, req);
2900         send_request(req);
2901 }
2902 
2903 static void linger_submit(struct ceph_osd_linger_request *lreq)
2904 {
2905         struct ceph_osd_client *osdc = lreq->osdc;
2906         struct ceph_osd *osd;
2907 
2908         calc_target(osdc, &lreq->t, NULL, false);
2909         osd = lookup_create_osd(osdc, lreq->t.osd, true);
2910         link_linger(osd, lreq);
2911 
2912         send_linger(lreq);
2913 }
2914 
2915 static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
2916 {
2917         struct ceph_osd_client *osdc = lreq->osdc;
2918         struct ceph_osd_linger_request *lookup_lreq;
2919 
2920         verify_osdc_wrlocked(osdc);
2921 
2922         lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
2923                                        lreq->linger_id);
2924         if (!lookup_lreq)
2925                 return;
2926 
2927         WARN_ON(lookup_lreq != lreq);
2928         erase_linger_mc(&osdc->linger_map_checks, lreq);
2929         linger_put(lreq);
2930 }
2931 
2932 /*
2933  * @lreq has to be both registered and linked.
2934  */
2935 static void __linger_cancel(struct ceph_osd_linger_request *lreq)
2936 {
2937         if (lreq->is_watch && lreq->ping_req->r_osd)
2938                 cancel_linger_request(lreq->ping_req);
2939         if (lreq->reg_req->r_osd)
2940                 cancel_linger_request(lreq->reg_req);
2941         cancel_linger_map_check(lreq);
2942         unlink_linger(lreq->osd, lreq);
2943         linger_unregister(lreq);
2944 }
2945 
2946 static void linger_cancel(struct ceph_osd_linger_request *lreq)
2947 {
2948         struct ceph_osd_client *osdc = lreq->osdc;
2949 
2950         down_write(&osdc->lock);
2951         if (__linger_registered(lreq))
2952                 __linger_cancel(lreq);
2953         up_write(&osdc->lock);
2954 }
2955 
2956 static void send_linger_map_check(struct ceph_osd_linger_request *lreq);
2957 
2958 static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
2959 {
2960         struct ceph_osd_client *osdc = lreq->osdc;
2961         struct ceph_osdmap *map = osdc->osdmap;
2962 
2963         verify_osdc_wrlocked(osdc);
2964         WARN_ON(!map->epoch);
2965 
2966         if (lreq->register_gen) {
2967                 lreq->map_dne_bound = map->epoch;
2968                 dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
2969                      lreq, lreq->linger_id);
2970         } else {
2971                 dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
2972                      __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
2973                      map->epoch);
2974         }
2975 
2976         if (lreq->map_dne_bound) {
2977                 if (map->epoch >= lreq->map_dne_bound) {
2978                         /* we had a new enough map */
2979                         pr_info("linger_id %llu pool does not exist\n",
2980                                 lreq->linger_id);
2981                         linger_reg_commit_complete(lreq, -ENOENT);
2982                         __linger_cancel(lreq);
2983                 }
2984         } else {
2985                 send_linger_map_check(lreq);
2986         }
2987 }
2988 
2989 static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
2990 {
2991         struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2992         struct ceph_osd_linger_request *lreq;
2993         u64 linger_id = greq->private_data;
2994 
2995         WARN_ON(greq->result || !greq->u.newest);
2996 
2997         down_write(&osdc->lock);
2998         lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
2999         if (!lreq) {
3000                 dout("%s linger_id %llu dne\n", __func__, linger_id);
3001                 goto out_unlock;
3002         }
3003 
3004         dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
3005              __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
3006              greq->u.newest);
3007         if (!lreq->map_dne_bound)
3008                 lreq->map_dne_bound = greq->u.newest;
3009         erase_linger_mc(&osdc->linger_map_checks, lreq);
3010         check_linger_pool_dne(lreq);
3011 
3012         linger_put(lreq);
3013 out_unlock:
3014         up_write(&osdc->lock);
3015 }
3016 
3017 static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
3018 {
3019         struct ceph_osd_client *osdc = lreq->osdc;
3020         struct ceph_osd_linger_request *lookup_lreq;
3021         int ret;
3022 
3023         verify_osdc_wrlocked(osdc);
3024 
3025         lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
3026                                        lreq->linger_id);
3027         if (lookup_lreq) {
3028                 WARN_ON(lookup_lreq != lreq);
3029                 return;
3030         }
3031 
3032         linger_get(lreq);
3033         insert_linger_mc(&osdc->linger_map_checks, lreq);
3034         ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
3035                                           linger_map_check_cb, lreq->linger_id);
3036         WARN_ON(ret);
3037 }
3038 
3039 static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
3040 {
3041         int ret;
3042 
3043         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3044         ret = wait_for_completion_interruptible(&lreq->reg_commit_wait);
3045         return ret ?: lreq->reg_commit_error;
3046 }
3047 
3048 static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq)
3049 {
3050         int ret;
3051 
3052         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3053         ret = wait_for_completion_interruptible(&lreq->notify_finish_wait);
3054         return ret ?: lreq->notify_finish_error;
3055 }
3056 
3057 /*
3058  * Timeout callback, called every N seconds.  When 1 or more OSD
3059  * requests has been active for more than N seconds, we send a keepalive
3060  * (tag + timestamp) to its OSD to ensure any communications channel
3061  * reset is detected.
3062  */
3063 static void handle_timeout(struct work_struct *work)
3064 {
3065         struct ceph_osd_client *osdc =
3066                 container_of(work, struct ceph_osd_client, timeout_work.work);
3067         struct ceph_options *opts = osdc->client->options;
3068         unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
3069         unsigned long expiry_cutoff = jiffies - opts->osd_request_timeout;
3070         LIST_HEAD(slow_osds);
3071         struct rb_node *n, *p;
3072 
3073         dout("%s osdc %p\n", __func__, osdc);
3074         down_write(&osdc->lock);
3075 
3076         /*
3077          * ping osds that are a bit slow.  this ensures that if there
3078          * is a break in the TCP connection we will notice, and reopen
3079          * a connection with that osd (from the fault callback).
3080          */
3081         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
3082                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3083                 bool found = false;
3084 
3085                 for (p = rb_first(&osd->o_requests); p; ) {
3086                         struct ceph_osd_request *req =
3087                             rb_entry(p, struct ceph_osd_request, r_node);
3088 
3089                         p = rb_next(p); /* abort_request() */
3090 
3091                         if (time_before(req->r_stamp, cutoff)) {
3092                                 dout(" req %p tid %llu on osd%d is laggy\n",
3093                                      req, req->r_tid, osd->o_osd);
3094                                 found = true;
3095                         }
3096                         if (opts->osd_request_timeout &&
3097                             time_before(req->r_start_stamp, expiry_cutoff)) {
3098                                 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3099                                        req->r_tid, osd->o_osd);
3100                                 abort_request(req, -ETIMEDOUT);
3101                         }
3102                 }
3103                 for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
3104                         struct ceph_osd_linger_request *lreq =
3105                             rb_entry(p, struct ceph_osd_linger_request, node);
3106 
3107                         dout(" lreq %p linger_id %llu is served by osd%d\n",
3108                              lreq, lreq->linger_id, osd->o_osd);
3109                         found = true;
3110 
3111                         mutex_lock(&lreq->lock);
3112                         if (lreq->is_watch && lreq->committed && !lreq->last_error)
3113                                 send_linger_ping(lreq);
3114                         mutex_unlock(&lreq->lock);
3115                 }
3116 
3117                 if (found)
3118                         list_move_tail(&osd->o_keepalive_item, &slow_osds);
3119         }
3120 
3121         if (opts->osd_request_timeout) {
3122                 for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
3123                         struct ceph_osd_request *req =
3124                             rb_entry(p, struct ceph_osd_request, r_node);
3125 
3126                         p = rb_next(p); /* abort_request() */
3127 
3128                         if (time_before(req->r_start_stamp, expiry_cutoff)) {
3129                                 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3130                                        req->r_tid, osdc->homeless_osd.o_osd);
3131                                 abort_request(req, -ETIMEDOUT);
3132                         }
3133                 }
3134         }
3135 
3136         if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
3137                 maybe_request_map(osdc);
3138 
3139         while (!list_empty(&slow_osds)) {
3140                 struct ceph_osd *osd = list_first_entry(&slow_osds,
3141                                                         struct ceph_osd,
3142                                                         o_keepalive_item);
3143                 list_del_init(&osd->o_keepalive_item);
3144                 ceph_con_keepalive(&osd->o_con);
3145         }
3146 
3147         up_write(&osdc->lock);
3148         schedule_delayed_work(&osdc->timeout_work,
3149                               osdc->client->options->osd_keepalive_timeout);
3150 }
3151 
3152 static void handle_osds_timeout(struct work_struct *work)
3153 {
3154         struct ceph_osd_client *osdc =
3155                 container_of(work, struct ceph_osd_client,
3156                              osds_timeout_work.work);
3157         unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
3158         struct ceph_osd *osd, *nosd;
3159 
3160         dout("%s osdc %p\n", __func__, osdc);
3161         down_write(&osdc->lock);
3162         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
3163                 if (time_before(jiffies, osd->lru_ttl))
3164                         break;
3165 
3166                 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
3167                 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
3168                 close_osd(osd);
3169         }
3170 
3171         up_write(&osdc->lock);
3172         schedule_delayed_work(&osdc->osds_timeout_work,
3173                               round_jiffies_relative(delay));
3174 }
3175 
3176 static int ceph_oloc_decode(void **p, void *end,
3177                             struct ceph_object_locator *oloc)
3178 {
3179         u8 struct_v, struct_cv;
3180         u32 len;
3181         void *struct_end;
3182         int ret = 0;
3183 
3184         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3185         struct_v = ceph_decode_8(p);
3186         struct_cv = ceph_decode_8(p);
3187         if (struct_v < 3) {
3188                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
3189                         struct_v, struct_cv);
3190                 goto e_inval;
3191         }
3192         if (struct_cv > 6) {
3193                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
3194                         struct_v, struct_cv);
3195                 goto e_inval;
3196         }
3197         len = ceph_decode_32(p);
3198         ceph_decode_need(p, end, len, e_inval);
3199         struct_end = *p + len;
3200 
3201         oloc->pool = ceph_decode_64(p);
3202         *p += 4; /* skip preferred */
3203 
3204         len = ceph_decode_32(p);
3205         if (len > 0) {
3206                 pr_warn("ceph_object_locator::key is set\n");
3207                 goto e_inval;
3208         }
3209 
3210         if (struct_v >= 5) {
3211                 bool changed = false;
3212 
3213                 len = ceph_decode_32(p);
3214                 if (len > 0) {
3215                         ceph_decode_need(p, end, len, e_inval);
3216                         if (!oloc->pool_ns ||
3217                             ceph_compare_string(oloc->pool_ns, *p, len))
3218                                 changed = true;
3219                         *p += len;
3220                 } else {
3221                         if (oloc->pool_ns)
3222                                 changed = true;
3223                 }
3224                 if (changed) {
3225                         /* redirect changes namespace */
3226                         pr_warn("ceph_object_locator::nspace is changed\n");
3227                         goto e_inval;
3228                 }
3229         }
3230 
3231         if (struct_v >= 6) {
3232                 s64 hash = ceph_decode_64(p);
3233                 if (hash != -1) {
3234                         pr_warn("ceph_object_locator::hash is set\n");
3235                         goto e_inval;
3236                 }
3237         }
3238 
3239         /* skip the rest */
3240         *p = struct_end;
3241 out:
3242         return ret;
3243 
3244 e_inval:
3245         ret = -EINVAL;
3246         goto out;
3247 }
3248 
3249 static int ceph_redirect_decode(void **p, void *end,
3250                                 struct ceph_request_redirect *redir)
3251 {
3252         u8 struct_v, struct_cv;
3253         u32 len;
3254         void *struct_end;
3255         int ret;
3256 
3257         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3258         struct_v = ceph_decode_8(p);
3259         struct_cv = ceph_decode_8(p);
3260         if (struct_cv > 1) {
3261                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
3262                         struct_v, struct_cv);
3263                 goto e_inval;
3264         }
3265         len = ceph_decode_32(p);
3266         ceph_decode_need(p, end, len, e_inval);
3267         struct_end = *p + len;
3268 
3269         ret = ceph_oloc_decode(p, end, &redir->oloc);
3270         if (ret)
3271                 goto out;
3272 
3273         len = ceph_decode_32(p);
3274         if (len > 0) {
3275                 pr_warn("ceph_request_redirect::object_name is set\n");
3276                 goto e_inval;
3277         }
3278 
3279         len = ceph_decode_32(p);
3280         *p += len; /* skip osd_instructions */
3281 
3282         /* skip the rest */
3283         *p = struct_end;
3284 out:
3285         return ret;
3286 
3287 e_inval:
3288         ret = -EINVAL;
3289         goto out;
3290 }
3291 
3292 struct MOSDOpReply {
3293         struct ceph_pg pgid;
3294         u64 flags;
3295         int result;
3296         u32 epoch;
3297         int num_ops;
3298         u32 outdata_len[CEPH_OSD_MAX_OPS];
3299         s32 rval[CEPH_OSD_MAX_OPS];
3300         int retry_attempt;
3301         struct ceph_eversion replay_version;
3302         u64 user_version;
3303         struct ceph_request_redirect redirect;
3304 };
3305 
3306 static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
3307 {
3308         void *p = msg->front.iov_base;
3309         void *const end = p + msg->front.iov_len;
3310         u16 version = le16_to_cpu(msg->hdr.version);
3311         struct ceph_eversion bad_replay_version;
3312         u8 decode_redir;
3313         u32 len;
3314         int ret;
3315         int i;
3316 
3317         ceph_decode_32_safe(&p, end, len, e_inval);
3318         ceph_decode_need(&p, end, len, e_inval);
3319         p += len; /* skip oid */
3320 
3321         ret = ceph_decode_pgid(&p, end, &m->pgid);
3322         if (ret)
3323                 return ret;
3324 
3325         ceph_decode_64_safe(&p, end, m->flags, e_inval);
3326         ceph_decode_32_safe(&p, end, m->result, e_inval);
3327         ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
3328         memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
3329         p += sizeof(bad_replay_version);
3330         ceph_decode_32_safe(&p, end, m->epoch, e_inval);
3331 
3332         ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
3333         if (m->num_ops > ARRAY_SIZE(m->outdata_len))
3334                 goto e_inval;
3335 
3336         ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
3337                          e_inval);
3338         for (i = 0; i < m->num_ops; i++) {
3339                 struct ceph_osd_op *op = p;
3340 
3341                 m->outdata_len[i] = le32_to_cpu(op->payload_len);
3342                 p += sizeof(*op);
3343         }
3344 
3345         ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
3346         for (i = 0; i < m->num_ops; i++)
3347                 ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
3348 
3349         if (version >= 5) {
3350                 ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
3351                 memcpy(&m->replay_version, p, sizeof(m->replay_version));
3352                 p += sizeof(m->replay_version);
3353                 ceph_decode_64_safe(&p, end, m->user_version, e_inval);
3354         } else {
3355                 m->replay_version = bad_replay_version; /* struct */
3356                 m->user_version = le64_to_cpu(m->replay_version.version);
3357         }
3358 
3359         if (version >= 6) {
3360                 if (version >= 7)
3361                         ceph_decode_8_safe(&p, end, decode_redir, e_inval);
3362                 else
3363                         decode_redir = 1;
3364         } else {
3365                 decode_redir = 0;
3366         }
3367 
3368         if (decode_redir) {
3369                 ret = ceph_redirect_decode(&p, end, &m->redirect);
3370                 if (ret)
3371                         return ret;
3372         } else {
3373                 ceph_oloc_init(&m->redirect.oloc);
3374         }
3375 
3376         return 0;
3377 
3378 e_inval:
3379         return -EINVAL;
3380 }
3381 
3382 /*
3383  * Handle MOSDOpReply.  Set ->r_result and call the callback if it is
3384  * specified.
3385  */
3386 static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
3387 {
3388         struct ceph_osd_client *osdc = osd->o_osdc;
3389         struct ceph_osd_request *req;
3390         struct MOSDOpReply m;
3391         u64 tid = le64_to_cpu(msg->hdr.tid);
3392         u32 data_len = 0;
3393         int ret;
3394         int i;
3395 
3396         dout("%s msg %p tid %llu\n", __func__, msg, tid);
3397 
3398         down_read(&osdc->lock);
3399         if (!osd_registered(osd)) {
3400                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3401                 goto out_unlock_osdc;
3402         }
3403         WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
3404 
3405         mutex_lock(&osd->lock);
3406         req = lookup_request(&osd->o_requests, tid);
3407         if (!req) {
3408                 dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
3409                 goto out_unlock_session;
3410         }
3411 
3412         m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
3413         ret = decode_MOSDOpReply(msg, &m);
3414         m.redirect.oloc.pool_ns = NULL;
3415         if (ret) {
3416                 pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
3417                        req->r_tid, ret);
3418                 ceph_msg_dump(msg);
3419                 goto fail_request;
3420         }
3421         dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
3422              __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
3423              m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
3424              le64_to_cpu(m.replay_version.version), m.user_version);
3425 
3426         if (m.retry_attempt >= 0) {
3427                 if (m.retry_attempt != req->r_attempts - 1) {
3428                         dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
3429                              req, req->r_tid, m.retry_attempt,
3430                              req->r_attempts - 1);
3431                         goto out_unlock_session;
3432                 }
3433         } else {
3434                 WARN_ON(1); /* MOSDOpReply v4 is assumed */
3435         }
3436 
3437         if (!ceph_oloc_empty(&m.redirect.oloc)) {
3438                 dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
3439                      m.redirect.oloc.pool);
3440                 unlink_request(osd, req);
3441                 mutex_unlock(&osd->lock);
3442 
3443                 /*
3444                  * Not ceph_oloc_copy() - changing pool_ns is not
3445                  * supported.
3446                  */
3447                 req->r_t.target_oloc.pool = m.redirect.oloc.pool;
3448                 req->r_flags |= CEPH_OSD_FLAG_REDIRECTED;
3449                 req->r_tid = 0;
3450                 __submit_request(req, false);
3451                 goto out_unlock_osdc;
3452         }
3453 
3454         if (m.num_ops != req->r_num_ops) {
3455                 pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
3456                        req->r_num_ops, req->r_tid);
3457                 goto fail_request;
3458         }
3459         for (i = 0; i < req->r_num_ops; i++) {
3460                 dout(" req %p tid %llu op %d rval %d len %u\n", req,
3461                      req->r_tid, i, m.rval[i], m.outdata_len[i]);
3462                 req->r_ops[i].rval = m.rval[i];
3463                 req->r_ops[i].outdata_len = m.outdata_len[i];
3464                 data_len += m.outdata_len[i];
3465         }
3466         if (data_len != le32_to_cpu(msg->hdr.data_len)) {
3467                 pr_err("sum of lens %u != %u for tid %llu\n", data_len,
3468                        le32_to_cpu(msg->hdr.data_len), req->r_tid);
3469                 goto fail_request;
3470         }
3471         dout("%s req %p tid %llu result %d data_len %u\n", __func__,
3472              req, req->r_tid, m.result, data_len);
3473 
3474         /*
3475          * Since we only ever request ONDISK, we should only ever get
3476          * one (type of) reply back.
3477          */
3478         WARN_ON(!(m.flags & CEPH_OSD_FLAG_ONDISK));
3479         req->r_result = m.result ?: data_len;
3480         finish_request(req);
3481         mutex_unlock(&osd->lock);
3482         up_read(&osdc->lock);
3483 
3484         __complete_request(req);
3485         complete_all(&req->r_completion);
3486         ceph_osdc_put_request(req);
3487         return;
3488 
3489 fail_request:
3490         complete_request(req, -EIO);
3491 out_unlock_session:
3492         mutex_unlock(&osd->lock);
3493 out_unlock_osdc:
3494         up_read(&osdc->lock);
3495 }
3496 
3497 static void set_pool_was_full(struct ceph_osd_client *osdc)
3498 {
3499         struct rb_node *n;
3500 
3501         for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
3502                 struct ceph_pg_pool_info *pi =
3503                     rb_entry(n, struct ceph_pg_pool_info, node);
3504 
3505                 pi->was_full = __pool_full(pi);
3506         }
3507 }
3508 
3509 static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
3510 {
3511         struct ceph_pg_pool_info *pi;
3512 
3513         pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
3514         if (!pi)
3515                 return false;
3516 
3517         return pi->was_full && !__pool_full(pi);
3518 }
3519 
3520 static enum calc_target_result
3521 recalc_linger_target(struct ceph_osd_linger_request *lreq)
3522 {
3523         struct ceph_osd_client *osdc = lreq->osdc;
3524         enum calc_target_result ct_res;
3525 
3526         ct_res = calc_target(osdc, &lreq->t, NULL, true);
3527         if (ct_res == CALC_TARGET_NEED_RESEND) {
3528                 struct ceph_osd *osd;
3529 
3530                 osd = lookup_create_osd(osdc, lreq->t.osd, true);
3531                 if (osd != lreq->osd) {
3532                         unlink_linger(lreq->osd, lreq);
3533                         link_linger(osd, lreq);
3534                 }
3535         }
3536 
3537         return ct_res;
3538 }
3539 
3540 /*
3541  * Requeue requests whose mapping to an OSD has changed.
3542  */
3543 static void scan_requests(struct ceph_osd *osd,
3544                           bool force_resend,
3545                           bool cleared_full,
3546                           bool check_pool_cleared_full,
3547                           struct rb_root *need_resend,
3548                           struct list_head *need_resend_linger)
3549 {
3550         struct ceph_osd_client *osdc = osd->o_osdc;
3551         struct rb_node *n;
3552         bool force_resend_writes;
3553 
3554         for (n = rb_first(&osd->o_linger_requests); n; ) {
3555                 struct ceph_osd_linger_request *lreq =
3556                     rb_entry(n, struct ceph_osd_linger_request, node);
3557                 enum calc_target_result ct_res;
3558 
3559                 n = rb_next(n); /* recalc_linger_target() */
3560 
3561                 dout("%s lreq %p linger_id %llu\n", __func__, lreq,
3562                      lreq->linger_id);
3563                 ct_res = recalc_linger_target(lreq);
3564                 switch (ct_res) {
3565                 case CALC_TARGET_NO_ACTION:
3566                         force_resend_writes = cleared_full ||
3567                             (check_pool_cleared_full &&
3568                              pool_cleared_full(osdc, lreq->t.base_oloc.pool));
3569                         if (!force_resend && !force_resend_writes)
3570                                 break;
3571 
3572                         /* fall through */
3573                 case CALC_TARGET_NEED_RESEND:
3574                         cancel_linger_map_check(lreq);
3575                         /*
3576                          * scan_requests() for the previous epoch(s)
3577                          * may have already added it to the list, since
3578                          * it's not unlinked here.
3579                          */
3580                         if (list_empty(&lreq->scan_item))
3581                                 list_add_tail(&lreq->scan_item, need_resend_linger);
3582                         break;
3583                 case CALC_TARGET_POOL_DNE:
3584                         list_del_init(&lreq->scan_item);
3585                         check_linger_pool_dne(lreq);
3586                         break;
3587                 }
3588         }
3589 
3590         for (n = rb_first(&osd->o_requests); n; ) {
3591                 struct ceph_osd_request *req =
3592                     rb_entry(n, struct ceph_osd_request, r_node);
3593                 enum calc_target_result ct_res;
3594 
3595                 n = rb_next(n); /* unlink_request(), check_pool_dne() */
3596 
3597                 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3598                 ct_res = calc_target(osdc, &req->r_t, &req->r_osd->o_con,
3599                                      false);
3600                 switch (ct_res) {
3601                 case CALC_TARGET_NO_ACTION:
3602                         force_resend_writes = cleared_full ||
3603                             (check_pool_cleared_full &&
3604                              pool_cleared_full(osdc, req->r_t.base_oloc.pool));
3605                         if (!force_resend &&
3606                             (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
3607                              !force_resend_writes))
3608                                 break;
3609 
3610                         /* fall through */
3611                 case CALC_TARGET_NEED_RESEND:
3612                         cancel_map_check(req);
3613                         unlink_request(osd, req);
3614                         insert_request(need_resend, req);
3615                         break;
3616                 case CALC_TARGET_POOL_DNE:
3617                         check_pool_dne(req);
3618                         break;
3619                 }
3620         }
3621 }
3622 
3623 static int handle_one_map(struct ceph_osd_client *osdc,
3624                           void *p, void *end, bool incremental,
3625                           struct rb_root *need_resend,
3626                           struct list_head *need_resend_linger)
3627 {
3628         struct ceph_osdmap *newmap;
3629         struct rb_node *n;
3630         bool skipped_map = false;
3631         bool was_full;
3632 
3633         was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3634         set_pool_was_full(osdc);
3635 
3636         if (incremental)
3637                 newmap = osdmap_apply_incremental(&p, end, osdc->osdmap);
3638         else
3639                 newmap = ceph_osdmap_decode(&p, end);
3640         if (IS_ERR(newmap))
3641                 return PTR_ERR(newmap);
3642 
3643         if (newmap != osdc->osdmap) {
3644                 /*
3645                  * Preserve ->was_full before destroying the old map.
3646                  * For pools that weren't in the old map, ->was_full
3647                  * should be false.
3648                  */
3649                 for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
3650                         struct ceph_pg_pool_info *pi =
3651                             rb_entry(n, struct ceph_pg_pool_info, node);
3652                         struct ceph_pg_pool_info *old_pi;
3653 
3654                         old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
3655                         if (old_pi)
3656                                 pi->was_full = old_pi->was_full;
3657                         else
3658                                 WARN_ON(pi->was_full);
3659                 }
3660 
3661                 if (osdc->osdmap->epoch &&
3662                     osdc->osdmap->epoch + 1 < newmap->epoch) {
3663                         WARN_ON(incremental);
3664                         skipped_map = true;
3665                 }
3666 
3667                 ceph_osdmap_destroy(osdc->osdmap);
3668                 osdc->osdmap = newmap;
3669         }
3670 
3671         was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3672         scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
3673                       need_resend, need_resend_linger);
3674 
3675         for (n = rb_first(&osdc->osds); n; ) {
3676                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3677 
3678                 n = rb_next(n); /* close_osd() */
3679 
3680                 scan_requests(osd, skipped_map, was_full, true, need_resend,
3681                               need_resend_linger);
3682                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
3683                     memcmp(&osd->o_con.peer_addr,
3684                            ceph_osd_addr(osdc->osdmap, osd->o_osd),
3685                            sizeof(struct ceph_entity_addr)))
3686                         close_osd(osd);
3687         }
3688 
3689         return 0;
3690 }
3691 
3692 static void kick_requests(struct ceph_osd_client *osdc,
3693                           struct rb_root *need_resend,
3694                           struct list_head *need_resend_linger)
3695 {
3696         struct ceph_osd_linger_request *lreq, *nlreq;
3697         enum calc_target_result ct_res;
3698         struct rb_node *n;
3699 
3700         /* make sure need_resend targets reflect latest map */
3701         for (n = rb_first(need_resend); n; ) {
3702                 struct ceph_osd_request *req =
3703                     rb_entry(n, struct ceph_osd_request, r_node);
3704 
3705                 n = rb_next(n);
3706 
3707                 if (req->r_t.epoch < osdc->osdmap->epoch) {
3708                         ct_res = calc_target(osdc, &req->r_t, NULL, false);
3709                         if (ct_res == CALC_TARGET_POOL_DNE) {
3710                                 erase_request(need_resend, req);
3711                                 check_pool_dne(req);
3712                         }
3713                 }
3714         }
3715 
3716         for (n = rb_first(need_resend); n; ) {
3717                 struct ceph_osd_request *req =
3718                     rb_entry(n, struct ceph_osd_request, r_node);
3719                 struct ceph_osd *osd;
3720 
3721                 n = rb_next(n);
3722                 erase_request(need_resend, req); /* before link_request() */
3723 
3724                 osd = lookup_create_osd(osdc, req->r_t.osd, true);
3725                 link_request(osd, req);
3726                 if (!req->r_linger) {
3727                         if (!osd_homeless(osd) && !req->r_t.paused)
3728                                 send_request(req);
3729                 } else {
3730                         cancel_linger_request(req);
3731                 }
3732         }
3733 
3734         list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
3735                 if (!osd_homeless(lreq->osd))
3736                         send_linger(lreq);
3737 
3738                 list_del_init(&lreq->scan_item);
3739         }
3740 }
3741 
3742 /*
3743  * Process updated osd map.
3744  *
3745  * The message contains any number of incremental and full maps, normally
3746  * indicating some sort of topology change in the cluster.  Kick requests
3747  * off to different OSDs as needed.
3748  */
3749 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
3750 {
3751         void *p = msg->front.iov_base;
3752         void *const end = p + msg->front.iov_len;
3753         u32 nr_maps, maplen;
3754         u32 epoch;
3755         struct ceph_fsid fsid;
3756         struct rb_root need_resend = RB_ROOT;
3757         LIST_HEAD(need_resend_linger);
3758         bool handled_incremental = false;
3759         bool was_pauserd, was_pausewr;
3760         bool pauserd, pausewr;
3761         int err;
3762 
3763         dout("%s have %u\n", __func__, osdc->osdmap->epoch);
3764         down_write(&osdc->lock);
3765 
3766         /* verify fsid */
3767         ceph_decode_need(&p, end, sizeof(fsid), bad);
3768         ceph_decode_copy(&p, &fsid, sizeof(fsid));
3769         if (ceph_check_fsid(osdc->client, &fsid) < 0)
3770                 goto bad;
3771 
3772         was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3773         was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3774                       ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3775                       have_pool_full(osdc);
3776 
3777         /* incremental maps */
3778         ceph_decode_32_safe(&p, end, nr_maps, bad);
3779         dout(" %d inc maps\n", nr_maps);
3780         while (nr_maps > 0) {
3781                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3782                 epoch = ceph_decode_32(&p);
3783                 maplen = ceph_decode_32(&p);
3784                 ceph_decode_need(&p, end, maplen, bad);
3785                 if (osdc->osdmap->epoch &&
3786                     osdc->osdmap->epoch + 1 == epoch) {
3787                         dout("applying incremental map %u len %d\n",
3788                              epoch, maplen);
3789                         err = handle_one_map(osdc, p, p + maplen, true,
3790                                              &need_resend, &need_resend_linger);
3791                         if (err)
3792                                 goto bad;
3793                         handled_incremental = true;
3794                 } else {
3795                         dout("ignoring incremental map %u len %d\n",
3796                              epoch, maplen);
3797                 }
3798                 p += maplen;
3799                 nr_maps--;
3800         }
3801         if (handled_incremental)
3802                 goto done;
3803 
3804         /* full maps */
3805         ceph_decode_32_safe(&p, end, nr_maps, bad);
3806         dout(" %d full maps\n", nr_maps);
3807         while (nr_maps) {
3808                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3809                 epoch = ceph_decode_32(&p);
3810                 maplen = ceph_decode_32(&p);
3811                 ceph_decode_need(&p, end, maplen, bad);
3812                 if (nr_maps > 1) {
3813                         dout("skipping non-latest full map %u len %d\n",
3814                              epoch, maplen);
3815                 } else if (osdc->osdmap->epoch >= epoch) {
3816                         dout("skipping full map %u len %d, "
3817                              "older than our %u\n", epoch, maplen,
3818                              osdc->osdmap->epoch);
3819                 } else {
3820                         dout("taking full map %u len %d\n", epoch, maplen);
3821                         err = handle_one_map(osdc, p, p + maplen, false,
3822                                              &need_resend, &need_resend_linger);
3823                         if (err)
3824                                 goto bad;
3825                 }
3826                 p += maplen;
3827                 nr_maps--;
3828         }
3829 
3830 done:
3831         /*
3832          * subscribe to subsequent osdmap updates if full to ensure
3833          * we find out when we are no longer full and stop returning
3834          * ENOSPC.
3835          */
3836         pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
3837         pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
3838                   ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
3839                   have_pool_full(osdc);
3840         if (was_pauserd || was_pausewr || pauserd || pausewr ||
3841             osdc->osdmap->epoch < osdc->epoch_barrier)
3842                 maybe_request_map(osdc);
3843 
3844         kick_requests(osdc, &need_resend, &need_resend_linger);
3845 
3846         ceph_osdc_abort_on_full(osdc);
3847         ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
3848                           osdc->osdmap->epoch);
3849         up_write(&osdc->lock);
3850         wake_up_all(&osdc->client->auth_wq);
3851         return;
3852 
3853 bad:
3854         pr_err("osdc handle_map corrupt msg\n");
3855         ceph_msg_dump(msg);
3856         up_write(&osdc->lock);
3857 }
3858 
3859 /*
3860  * Resubmit requests pending on the given osd.
3861  */
3862 static void kick_osd_requests(struct ceph_osd *osd)
3863 {
3864         struct rb_node *n;
3865 
3866         clear_backoffs(osd);
3867 
3868         for (n = rb_first(&osd->o_requests); n; ) {
3869                 struct ceph_osd_request *req =
3870                     rb_entry(n, struct ceph_osd_request, r_node);
3871 
3872                 n = rb_next(n); /* cancel_linger_request() */
3873 
3874                 if (!req->r_linger) {
3875                         if (!req->r_t.paused)
3876                                 send_request(req);
3877                 } else {
3878                         cancel_linger_request(req);
3879                 }
3880         }
3881         for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
3882                 struct ceph_osd_linger_request *lreq =
3883                     rb_entry(n, struct ceph_osd_linger_request, node);
3884 
3885                 send_linger(lreq);
3886         }
3887 }
3888 
3889 /*
3890  * If the osd connection drops, we need to resubmit all requests.
3891  */
3892 static void osd_fault(struct ceph_connection *con)
3893 {
3894         struct ceph_osd *osd = con->private;
3895         struct ceph_osd_client *osdc = osd->o_osdc;
3896 
3897         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
3898 
3899         down_write(&osdc->lock);
3900         if (!osd_registered(osd)) {
3901                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3902                 goto out_unlock;
3903         }
3904 
3905         if (!reopen_osd(osd))
3906                 kick_osd_requests(osd);
3907         maybe_request_map(osdc);
3908 
3909 out_unlock:
3910         up_write(&osdc->lock);
3911 }
3912 
3913 struct MOSDBackoff {
3914         struct ceph_spg spgid;
3915         u32 map_epoch;
3916         u8 op;
3917         u64 id;
3918         struct ceph_hobject_id *begin;
3919         struct ceph_hobject_id *end;
3920 };
3921 
3922 static int decode_MOSDBackoff(const struct ceph_msg *msg, struct MOSDBackoff *m)
3923 {
3924         void *p = msg->front.iov_base;
3925         void *const end = p + msg->front.iov_len;
3926         u8 struct_v;
3927         u32 struct_len;
3928         int ret;
3929 
3930         ret = ceph_start_decoding(&p, end, 1, "spg_t", &struct_v, &struct_len);
3931         if (ret)
3932                 return ret;
3933 
3934         ret = ceph_decode_pgid(&p, end, &m->spgid.pgid);
3935         if (ret)
3936                 return ret;
3937 
3938         ceph_decode_8_safe(&p, end, m->spgid.shard, e_inval);
3939         ceph_decode_32_safe(&p, end, m->map_epoch, e_inval);
3940         ceph_decode_8_safe(&p, end, m->op, e_inval);
3941         ceph_decode_64_safe(&p, end, m->id, e_inval);
3942 
3943         m->begin = kzalloc(sizeof(*m->begin), GFP_NOIO);
3944         if (!m->begin)
3945                 return -ENOMEM;
3946 
3947         ret = decode_hoid(&p, end, m->begin);
3948         if (ret) {
3949                 free_hoid(m->begin);
3950                 return ret;
3951         }
3952 
3953         m->end = kzalloc(sizeof(*m->end), GFP_NOIO);
3954         if (!m->end) {
3955                 free_hoid(m->begin);
3956                 return -ENOMEM;
3957         }
3958 
3959         ret = decode_hoid(&p, end, m->end);
3960         if (ret) {
3961                 free_hoid(m->begin);
3962                 free_hoid(m->end);
3963                 return ret;
3964         }
3965 
3966         return 0;
3967 
3968 e_inval:
3969         return -EINVAL;
3970 }
3971 
3972 static struct ceph_msg *create_backoff_message(
3973                                 const struct ceph_osd_backoff *backoff,
3974                                 u32 map_epoch)
3975 {
3976         struct ceph_msg *msg;
3977         void *p, *end;
3978         int msg_size;
3979 
3980         msg_size = CEPH_ENCODING_START_BLK_LEN +
3981                         CEPH_PGID_ENCODING_LEN + 1; /* spgid */
3982         msg_size += 4 + 1 + 8; /* map_epoch, op, id */
3983         msg_size += CEPH_ENCODING_START_BLK_LEN +
3984                         hoid_encoding_size(backoff->begin);
3985         msg_size += CEPH_ENCODING_START_BLK_LEN +
3986                         hoid_encoding_size(backoff->end);
3987 
3988         msg = ceph_msg_new(CEPH_MSG_OSD_BACKOFF, msg_size, GFP_NOIO, true);
3989         if (!msg)
3990                 return NULL;
3991 
3992         p = msg->front.iov_base;
3993         end = p + msg->front_alloc_len;
3994 
3995         encode_spgid(&p, &backoff->spgid);
3996         ceph_encode_32(&p, map_epoch);
3997         ceph_encode_8(&p, CEPH_OSD_BACKOFF_OP_ACK_BLOCK);
3998         ceph_encode_64(&p, backoff->id);
3999         encode_hoid(&p, end, backoff->begin);
4000         encode_hoid(&p, end, backoff->end);
4001         BUG_ON(p != end);
4002 
4003         msg->front.iov_len = p - msg->front.iov_base;
4004         msg->hdr.version = cpu_to_le16(1); /* MOSDBackoff v1 */
4005         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
4006 
4007         return msg;
4008 }
4009 
4010 static void handle_backoff_block(struct ceph_osd *osd, struct MOSDBackoff *m)
4011 {
4012         struct ceph_spg_mapping *spg;
4013         struct ceph_osd_backoff *backoff;
4014         struct ceph_msg *msg;
4015 
4016         dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4017              m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4018 
4019         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &m->spgid);
4020         if (!spg) {
4021                 spg = alloc_spg_mapping();
4022                 if (!spg) {
4023                         pr_err("%s failed to allocate spg\n", __func__);
4024                         return;
4025                 }
4026                 spg->spgid = m->spgid; /* struct */
4027                 insert_spg_mapping(&osd->o_backoff_mappings, spg);
4028         }
4029 
4030         backoff = alloc_backoff();
4031         if (!backoff) {
4032                 pr_err("%s failed to allocate backoff\n", __func__);
4033                 return;
4034         }
4035         backoff->spgid = m->spgid; /* struct */
4036         backoff->id = m->id;
4037         backoff->begin = m->begin;
4038         m->begin = NULL; /* backoff now owns this */
4039         backoff->end = m->end;
4040         m->end = NULL;   /* ditto */
4041 
4042         insert_backoff(&spg->backoffs, backoff);
4043         insert_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4044 
4045         /*
4046          * Ack with original backoff's epoch so that the OSD can
4047          * discard this if there was a PG split.
4048          */
4049         msg = create_backoff_message(backoff, m->map_epoch);
4050         if (!msg) {
4051                 pr_err("%s failed to allocate msg\n", __func__);
4052                 return;
4053         }
4054         ceph_con_send(&osd->o_con, msg);
4055 }
4056 
4057 static bool target_contained_by(const struct ceph_osd_request_target *t,
4058                                 const struct ceph_hobject_id *begin,
4059                                 const struct ceph_hobject_id *end)
4060 {
4061         struct ceph_hobject_id hoid;
4062         int cmp;
4063 
4064         hoid_fill_from_target(&hoid, t);
4065         cmp = hoid_compare(&hoid, begin);
4066         return !cmp || (cmp > 0 && hoid_compare(&hoid, end) < 0);
4067 }
4068 
4069 static void handle_backoff_unblock(struct ceph_osd *osd,
4070                                    const struct MOSDBackoff *m)
4071 {
4072         struct ceph_spg_mapping *spg;
4073         struct ceph_osd_backoff *backoff;
4074         struct rb_node *n;
4075 
4076         dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4077              m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4078 
4079         backoff = lookup_backoff_by_id(&osd->o_backoffs_by_id, m->id);
4080         if (!backoff) {
4081                 pr_err("%s osd%d spgid %llu.%xs%d id %llu backoff dne\n",
4082                        __func__, osd->o_osd, m->spgid.pgid.pool,
4083                        m->spgid.pgid.seed, m->spgid.shard, m->id);
4084                 return;
4085         }
4086 
4087         if (hoid_compare(backoff->begin, m->begin) &&
4088             hoid_compare(backoff->end, m->end)) {
4089                 pr_err("%s osd%d spgid %llu.%xs%d id %llu bad range?\n",
4090                        __func__, osd->o_osd, m->spgid.pgid.pool,
4091                        m->spgid.pgid.seed, m->spgid.shard, m->id);
4092                 /* unblock it anyway... */
4093         }
4094 
4095         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &backoff->spgid);
4096         BUG_ON(!spg);
4097 
4098         erase_backoff(&spg->backoffs, backoff);
4099         erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4100         free_backoff(backoff);
4101 
4102         if (RB_EMPTY_ROOT(&spg->backoffs)) {
4103                 erase_spg_mapping(&osd->o_backoff_mappings, spg);
4104                 free_spg_mapping(spg);
4105         }
4106 
4107         for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
4108                 struct ceph_osd_request *req =
4109                     rb_entry(n, struct ceph_osd_request, r_node);
4110 
4111                 if (!ceph_spg_compare(&req->r_t.spgid, &m->spgid)) {
4112                         /*
4113                          * Match against @m, not @backoff -- the PG may
4114                          * have split on the OSD.
4115                          */
4116                         if (target_contained_by(&req->r_t, m->begin, m->end)) {
4117                                 /*
4118                                  * If no other installed backoff applies,
4119                                  * resend.
4120                                  */
4121                                 send_request(req);
4122                         }
4123                 }
4124         }
4125 }
4126 
4127 static void handle_backoff(struct ceph_osd *osd, struct ceph_msg *msg)
4128 {
4129         struct ceph_osd_client *osdc = osd->o_osdc;
4130         struct MOSDBackoff m;
4131         int ret;
4132 
4133         down_read(&osdc->lock);
4134         if (!osd_registered(osd)) {
4135                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
4136                 up_read(&osdc->lock);
4137                 return;
4138         }
4139         WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
4140 
4141         mutex_lock(&osd->lock);
4142         ret = decode_MOSDBackoff(msg, &m);
4143         if (ret) {
4144                 pr_err("failed to decode MOSDBackoff: %d\n", ret);
4145                 ceph_msg_dump(msg);
4146                 goto out_unlock;
4147         }
4148 
4149         switch (m.op) {
4150         case CEPH_OSD_BACKOFF_OP_BLOCK:
4151                 handle_backoff_block(osd, &m);
4152                 break;
4153         case CEPH_OSD_BACKOFF_OP_UNBLOCK:
4154                 handle_backoff_unblock(osd, &m);
4155                 break;
4156         default:
4157                 pr_err("%s osd%d unknown op %d\n", __func__, osd->o_osd, m.op);
4158         }
4159 
4160         free_hoid(m.begin);
4161         free_hoid(m.end);
4162 
4163 out_unlock:
4164         mutex_unlock(&osd->lock);
4165         up_read(&osdc->lock);
4166 }
4167 
4168 /*
4169  * Process osd watch notifications
4170  */
4171 static void handle_watch_notify(struct ceph_osd_client *osdc,
4172                                 struct ceph_msg *msg)
4173 {
4174         void *p = msg->front.iov_base;
4175         void *const end = p + msg->front.iov_len;
4176         struct ceph_osd_linger_request *lreq;
4177         struct linger_work *lwork;
4178         u8 proto_ver, opcode;
4179         u64 cookie, notify_id;
4180         u64 notifier_id = 0;
4181         s32 return_code = 0;
4182         void *payload = NULL;
4183         u32 payload_len = 0;
4184 
4185         ceph_decode_8_safe(&p, end, proto_ver, bad);
4186         ceph_decode_8_safe(&p, end, opcode, bad);
4187         ceph_decode_64_safe(&p, end, cookie, bad);
4188         p += 8; /* skip ver */
4189         ceph_decode_64_safe(&p, end, notify_id, bad);
4190 
4191         if (proto_ver >= 1) {
4192                 ceph_decode_32_safe(&p, end, payload_len, bad);
4193                 ceph_decode_need(&p, end, payload_len, bad);
4194                 payload = p;
4195                 p += payload_len;
4196         }
4197 
4198         if (le16_to_cpu(msg->hdr.version) >= 2)
4199                 ceph_decode_32_safe(&p, end, return_code, bad);
4200 
4201         if (le16_to_cpu(msg->hdr.version) >= 3)
4202                 ceph_decode_64_safe(&p, end, notifier_id, bad);
4203 
4204         down_read(&osdc->lock);
4205         lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
4206         if (!lreq) {
4207                 dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
4208                      cookie);
4209                 goto out_unlock_osdc;
4210         }
4211 
4212         mutex_lock(&lreq->lock);
4213         dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
4214              opcode, cookie, lreq, lreq->is_watch);
4215         if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
4216                 if (!lreq->last_error) {
4217                         lreq->last_error = -ENOTCONN;
4218                         queue_watch_error(lreq);
4219                 }
4220         } else if (!lreq->is_watch) {
4221                 /* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
4222                 if (lreq->notify_id && lreq->notify_id != notify_id) {
4223                         dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
4224                              lreq->notify_id, notify_id);
4225                 } else if (!completion_done(&lreq->notify_finish_wait)) {
4226                         struct ceph_msg_data *data =
4227                             list_first_entry_or_null(&msg->data,
4228                                                      struct ceph_msg_data,
4229                                                      links);
4230 
4231                         if (data) {
4232                                 if (lreq->preply_pages) {
4233                                         WARN_ON(data->type !=
4234                                                         CEPH_MSG_DATA_PAGES);
4235                                         *lreq->preply_pages = data->pages;
4236                                         *lreq->preply_len = data->length;
4237                                 } else {
4238                                         ceph_release_page_vector(data->pages,
4239                                                calc_pages_for(0, data->length));
4240                                 }
4241                         }
4242                         lreq->notify_finish_error = return_code;
4243                         complete_all(&lreq->notify_finish_wait);
4244                 }
4245         } else {
4246                 /* CEPH_WATCH_EVENT_NOTIFY */
4247                 lwork = lwork_alloc(lreq, do_watch_notify);
4248                 if (!lwork) {
4249                         pr_err("failed to allocate notify-lwork\n");
4250                         goto out_unlock_lreq;
4251                 }
4252 
4253                 lwork->notify.notify_id = notify_id;
4254                 lwork->notify.notifier_id = notifier_id;
4255                 lwork->notify.payload = payload;
4256                 lwork->notify.payload_len = payload_len;
4257                 lwork->notify.msg = ceph_msg_get(msg);
4258                 lwork_queue(lwork);
4259         }
4260 
4261 out_unlock_lreq:
4262         mutex_unlock(&lreq->lock);
4263 out_unlock_osdc:
4264         up_read(&osdc->lock);
4265         return;
4266 
4267 bad:
4268         pr_err("osdc handle_watch_notify corrupt msg\n");
4269 }
4270 
4271 /*
4272  * Register request, send initial attempt.
4273  */
4274 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
4275                             struct ceph_osd_request *req,
4276                             bool nofail)
4277 {
4278         down_read(&osdc->lock);
4279         submit_request(req, false);
4280         up_read(&osdc->lock);
4281 
4282         return 0;
4283 }
4284 EXPORT_SYMBOL(ceph_osdc_start_request);
4285 
4286 /*
4287  * Unregister a registered request.  The request is not completed:
4288  * ->r_result isn't set and __complete_request() isn't called.
4289  */
4290 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
4291 {
4292         struct ceph_osd_client *osdc = req->r_osdc;
4293 
4294         down_write(&osdc->lock);
4295         if (req->r_osd)
4296                 cancel_request(req);
4297         up_write(&osdc->lock);
4298 }
4299 EXPORT_SYMBOL(ceph_osdc_cancel_request);
4300 
4301 /*
4302  * @timeout: in jiffies, 0 means "wait forever"
4303  */
4304 static int wait_request_timeout(struct ceph_osd_request *req,
4305                                 unsigned long timeout)
4306 {
4307         long left;
4308 
4309         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
4310         left = wait_for_completion_killable_timeout(&req->r_completion,
4311                                                 ceph_timeout_jiffies(timeout));
4312         if (left <= 0) {
4313                 left = left ?: -ETIMEDOUT;
4314                 ceph_osdc_cancel_request(req);
4315         } else {
4316                 left = req->r_result; /* completed */
4317         }
4318 
4319         return left;
4320 }
4321 
4322 /*
4323  * wait for a request to complete
4324  */
4325 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
4326                            struct ceph_osd_request *req)
4327 {
4328         return wait_request_timeout(req, 0);
4329 }
4330 EXPORT_SYMBOL(ceph_osdc_wait_request);
4331 
4332 /*
4333  * sync - wait for all in-flight requests to flush.  avoid starvation.
4334  */
4335 void ceph_osdc_sync(struct ceph_osd_client *osdc)
4336 {
4337         struct rb_node *n, *p;
4338         u64 last_tid = atomic64_read(&osdc->last_tid);
4339 
4340 again:
4341         down_read(&osdc->lock);
4342         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
4343                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
4344 
4345                 mutex_lock(&osd->lock);
4346                 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
4347                         struct ceph_osd_request *req =
4348                             rb_entry(p, struct ceph_osd_request, r_node);
4349 
4350                         if (req->r_tid > last_tid)
4351                                 break;
4352 
4353                         if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
4354                                 continue;
4355 
4356                         ceph_osdc_get_request(req);
4357                         mutex_unlock(&osd->lock);
4358                         up_read(&osdc->lock);
4359                         dout("%s waiting on req %p tid %llu last_tid %llu\n",
4360                              __func__, req, req->r_tid, last_tid);
4361                         wait_for_completion(&req->r_completion);
4362                         ceph_osdc_put_request(req);
4363                         goto again;
4364                 }
4365 
4366                 mutex_unlock(&osd->lock);
4367         }
4368 
4369         up_read(&osdc->lock);
4370         dout("%s done last_tid %llu\n", __func__, last_tid);
4371 }
4372 EXPORT_SYMBOL(ceph_osdc_sync);
4373 
4374 static struct ceph_osd_request *
4375 alloc_linger_request(struct ceph_osd_linger_request *lreq)
4376 {
4377         struct ceph_osd_request *req;
4378 
4379         req = ceph_osdc_alloc_request(lreq->osdc, NULL, 1, false, GFP_NOIO);
4380         if (!req)
4381                 return NULL;
4382 
4383         ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4384         ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4385 
4386         if (ceph_osdc_alloc_messages(req, GFP_NOIO)) {
4387                 ceph_osdc_put_request(req);
4388                 return NULL;
4389         }
4390 
4391         return req;
4392 }
4393 
4394 /*
4395  * Returns a handle, caller owns a ref.
4396  */
4397 struct ceph_osd_linger_request *
4398 ceph_osdc_watch(struct ceph_osd_client *osdc,
4399                 struct ceph_object_id *oid,
4400                 struct ceph_object_locator *oloc,
4401                 rados_watchcb2_t wcb,
4402                 rados_watcherrcb_t errcb,
4403                 void *data)
4404 {
4405         struct ceph_osd_linger_request *lreq;
4406         int ret;
4407 
4408         lreq = linger_alloc(osdc);
4409         if (!lreq)
4410                 return ERR_PTR(-ENOMEM);
4411 
4412         lreq->is_watch = true;
4413         lreq->wcb = wcb;
4414         lreq->errcb = errcb;
4415         lreq->data = data;
4416         lreq->watch_valid_thru = jiffies;
4417 
4418         ceph_oid_copy(&lreq->t.base_oid, oid);
4419         ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4420         lreq->t.flags = CEPH_OSD_FLAG_WRITE;
4421         ktime_get_real_ts(&lreq->mtime);
4422 
4423         lreq->reg_req = alloc_linger_request(lreq);
4424         if (!lreq->reg_req) {
4425                 ret = -ENOMEM;
4426                 goto err_put_lreq;
4427         }
4428 
4429         lreq->ping_req = alloc_linger_request(lreq);
4430         if (!lreq->ping_req) {
4431                 ret = -ENOMEM;
4432                 goto err_put_lreq;
4433         }
4434 
4435         down_write(&osdc->lock);
4436         linger_register(lreq); /* before osd_req_op_* */
4437         osd_req_op_watch_init(lreq->reg_req, 0, lreq->linger_id,
4438                               CEPH_OSD_WATCH_OP_WATCH);
4439         osd_req_op_watch_init(lreq->ping_req, 0, lreq->linger_id,
4440                               CEPH_OSD_WATCH_OP_PING);
4441         linger_submit(lreq);
4442         up_write(&osdc->lock);
4443 
4444         ret = linger_reg_commit_wait(lreq);
4445         if (ret) {
4446                 linger_cancel(lreq);
4447                 goto err_put_lreq;
4448         }
4449 
4450         return lreq;
4451 
4452 err_put_lreq:
4453         linger_put(lreq);
4454         return ERR_PTR(ret);
4455 }
4456 EXPORT_SYMBOL(ceph_osdc_watch);
4457 
4458 /*
4459  * Releases a ref.
4460  *
4461  * Times out after mount_timeout to preserve rbd unmap behaviour
4462  * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
4463  * with mount_timeout").
4464  */
4465 int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
4466                       struct ceph_osd_linger_request *lreq)
4467 {
4468         struct ceph_options *opts = osdc->client->options;
4469         struct ceph_osd_request *req;
4470         int ret;
4471 
4472         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4473         if (!req)
4474                 return -ENOMEM;
4475 
4476         ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4477         ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4478         req->r_flags = CEPH_OSD_FLAG_WRITE;
4479         ktime_get_real_ts(&req->r_mtime);
4480         osd_req_op_watch_init(req, 0, lreq->linger_id,
4481                               CEPH_OSD_WATCH_OP_UNWATCH);
4482 
4483         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4484         if (ret)
4485                 goto out_put_req;
4486 
4487         ceph_osdc_start_request(osdc, req, false);
4488         linger_cancel(lreq);
4489         linger_put(lreq);
4490         ret = wait_request_timeout(req, opts->mount_timeout);
4491 
4492 out_put_req:
4493         ceph_osdc_put_request(req);
4494         return ret;
4495 }
4496 EXPORT_SYMBOL(ceph_osdc_unwatch);
4497 
4498 static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
4499                                       u64 notify_id, u64 cookie, void *payload,
4500                                       size_t payload_len)
4501 {
4502         struct ceph_osd_req_op *op;
4503         struct ceph_pagelist *pl;
4504         int ret;
4505 
4506         op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
4507 
4508         pl = kmalloc(sizeof(*pl), GFP_NOIO);
4509         if (!pl)
4510                 return -ENOMEM;
4511 
4512         ceph_pagelist_init(pl);
4513         ret = ceph_pagelist_encode_64(pl, notify_id);
4514         ret |= ceph_pagelist_encode_64(pl, cookie);
4515         if (payload) {
4516                 ret |= ceph_pagelist_encode_32(pl, payload_len);
4517                 ret |= ceph_pagelist_append(pl, payload, payload_len);
4518         } else {
4519                 ret |= ceph_pagelist_encode_32(pl, 0);
4520         }
4521         if (ret) {
4522                 ceph_pagelist_release(pl);
4523                 return -ENOMEM;
4524         }
4525 
4526         ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
4527         op->indata_len = pl->length;
4528         return 0;
4529 }
4530 
4531 int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
4532                          struct ceph_object_id *oid,
4533                          struct ceph_object_locator *oloc,
4534                          u64 notify_id,
4535                          u64 cookie,
4536                          void *payload,
4537                          size_t payload_len)
4538 {
4539         struct ceph_osd_request *req;
4540         int ret;
4541 
4542         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4543         if (!req)
4544                 return -ENOMEM;
4545 
4546         ceph_oid_copy(&req->r_base_oid, oid);
4547         ceph_oloc_copy(&req->r_base_oloc, oloc);
4548         req->r_flags = CEPH_OSD_FLAG_READ;
4549 
4550         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4551         if (ret)
4552                 goto out_put_req;
4553 
4554         ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
4555                                          payload_len);
4556         if (ret)
4557                 goto out_put_req;
4558 
4559         ceph_osdc_start_request(osdc, req, false);
4560         ret = ceph_osdc_wait_request(osdc, req);
4561 
4562 out_put_req:
4563         ceph_osdc_put_request(req);
4564         return ret;
4565 }
4566 EXPORT_SYMBOL(ceph_osdc_notify_ack);
4567 
4568 static int osd_req_op_notify_init(struct ceph_osd_request *req, int which,
4569                                   u64 cookie, u32 prot_ver, u32 timeout,
4570                                   void *payload, size_t payload_len)
4571 {
4572         struct ceph_osd_req_op *op;
4573         struct ceph_pagelist *pl;
4574         int ret;
4575 
4576         op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
4577         op->notify.cookie = cookie;
4578 
4579         pl = kmalloc(sizeof(*pl), GFP_NOIO);
4580         if (!pl)
4581                 return -ENOMEM;
4582 
4583         ceph_pagelist_init(pl);
4584         ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
4585         ret |= ceph_pagelist_encode_32(pl, timeout);
4586         ret |= ceph_pagelist_encode_32(pl, payload_len);
4587         ret |= ceph_pagelist_append(pl, payload, payload_len);
4588         if (ret) {
4589                 ceph_pagelist_release(pl);
4590                 return -ENOMEM;
4591         }
4592 
4593         ceph_osd_data_pagelist_init(&op->notify.request_data, pl);
4594         op->indata_len = pl->length;
4595         return 0;
4596 }
4597 
4598 /*
4599  * @timeout: in seconds
4600  *
4601  * @preply_{pages,len} are initialized both on success and error.
4602  * The caller is responsible for:
4603  *
4604  *     ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
4605  */
4606 int ceph_osdc_notify(struct ceph_osd_client *osdc,
4607                      struct ceph_object_id *oid,
4608                      struct ceph_object_locator *oloc,
4609                      void *payload,
4610                      size_t payload_len,
4611                      u32 timeout,
4612                      struct page ***preply_pages,
4613                      size_t *preply_len)
4614 {
4615         struct ceph_osd_linger_request *lreq;
4616         struct page **pages;
4617         int ret;
4618 
4619         WARN_ON(!timeout);
4620         if (preply_pages) {
4621                 *preply_pages = NULL;
4622                 *preply_len = 0;
4623         }
4624 
4625         lreq = linger_alloc(osdc);
4626         if (!lreq)
4627                 return -ENOMEM;
4628 
4629         lreq->preply_pages = preply_pages;
4630         lreq->preply_len = preply_len;
4631 
4632         ceph_oid_copy(&lreq->t.base_oid, oid);
4633         ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4634         lreq->t.flags = CEPH_OSD_FLAG_READ;
4635 
4636         lreq->reg_req = alloc_linger_request(lreq);
4637         if (!lreq->reg_req) {
4638                 ret = -ENOMEM;
4639                 goto out_put_lreq;
4640         }
4641 
4642         /* for notify_id */
4643         pages = ceph_alloc_page_vector(1, GFP_NOIO);
4644         if (IS_ERR(pages)) {
4645                 ret = PTR_ERR(pages);
4646                 goto out_put_lreq;
4647         }
4648 
4649         down_write(&osdc->lock);
4650         linger_register(lreq); /* before osd_req_op_* */
4651         ret = osd_req_op_notify_init(lreq->reg_req, 0, lreq->linger_id, 1,
4652                                      timeout, payload, payload_len);
4653         if (ret) {
4654                 linger_unregister(lreq);
4655                 up_write(&osdc->lock);
4656                 ceph_release_page_vector(pages, 1);
4657                 goto out_put_lreq;
4658         }
4659         ceph_osd_data_pages_init(osd_req_op_data(lreq->reg_req, 0, notify,
4660                                                  response_data),
4661                                  pages, PAGE_SIZE, 0, false, true);
4662         linger_submit(lreq);
4663         up_write(&osdc->lock);
4664 
4665         ret = linger_reg_commit_wait(lreq);
4666         if (!ret)
4667                 ret = linger_notify_finish_wait(lreq);
4668         else
4669                 dout("lreq %p failed to initiate notify %d\n", lreq, ret);
4670 
4671         linger_cancel(lreq);
4672 out_put_lreq:
4673         linger_put(lreq);
4674         return ret;
4675 }
4676 EXPORT_SYMBOL(ceph_osdc_notify);
4677 
4678 /*
4679  * Return the number of milliseconds since the watch was last
4680  * confirmed, or an error.  If there is an error, the watch is no
4681  * longer valid, and should be destroyed with ceph_osdc_unwatch().
4682  */
4683 int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
4684                           struct ceph_osd_linger_request *lreq)
4685 {
4686         unsigned long stamp, age;
4687         int ret;
4688 
4689         down_read(&osdc->lock);
4690         mutex_lock(&lreq->lock);
4691         stamp = lreq->watch_valid_thru;
4692         if (!list_empty(&lreq->pending_lworks)) {
4693                 struct linger_work *lwork =
4694                     list_first_entry(&lreq->pending_lworks,
4695                                      struct linger_work,
4696                                      pending_item);
4697 
4698                 if (time_before(lwork->queued_stamp, stamp))
4699                         stamp = lwork->queued_stamp;
4700         }
4701         age = jiffies - stamp;
4702         dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
4703              lreq, lreq->linger_id, age, lreq->last_error);
4704         /* we are truncating to msecs, so return a safe upper bound */
4705         ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
4706 
4707         mutex_unlock(&lreq->lock);
4708         up_read(&osdc->lock);
4709         return ret;
4710 }
4711 
4712 static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
4713 {
4714         u8 struct_v;
4715         u32 struct_len;
4716         int ret;
4717 
4718         ret = ceph_start_decoding(p, end, 2, "watch_item_t",
4719                                   &struct_v, &struct_len);
4720         if (ret)
4721                 return ret;
4722 
4723         ceph_decode_copy(p, &item->name, sizeof(item->name));
4724         item->cookie = ceph_decode_64(p);
4725         *p += 4; /* skip timeout_seconds */
4726         if (struct_v >= 2) {
4727                 ceph_decode_copy(p, &item->addr, sizeof(item->addr));
4728                 ceph_decode_addr(&item->addr);
4729         }
4730 
4731         dout("%s %s%llu cookie %llu addr %s\n", __func__,
4732              ENTITY_NAME(item->name), item->cookie,
4733              ceph_pr_addr(&item->addr.in_addr));
4734         return 0;
4735 }
4736 
4737 static int decode_watchers(void **p, void *end,
4738                            struct ceph_watch_item **watchers,
4739                            u32 *num_watchers)
4740 {
4741         u8 struct_v;
4742         u32 struct_len;
4743         int i;
4744         int ret;
4745 
4746         ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
4747                                   &struct_v, &struct_len);
4748         if (ret)
4749                 return ret;
4750 
4751         *num_watchers = ceph_decode_32(p);
4752         *watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
4753         if (!*watchers)
4754                 return -ENOMEM;
4755 
4756         for (i = 0; i < *num_watchers; i++) {
4757                 ret = decode_watcher(p, end, *watchers + i);
4758                 if (ret) {
4759                         kfree(*watchers);
4760                         return ret;
4761                 }
4762         }
4763 
4764         return 0;
4765 }
4766 
4767 /*
4768  * On success, the caller is responsible for:
4769  *
4770  *     kfree(watchers);
4771  */
4772 int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
4773                             struct ceph_object_id *oid,
4774                             struct ceph_object_locator *oloc,
4775                             struct ceph_watch_item **watchers,
4776                             u32 *num_watchers)
4777 {
4778         struct ceph_osd_request *req;
4779         struct page **pages;
4780         int ret;
4781 
4782         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4783         if (!req)
4784                 return -ENOMEM;
4785 
4786         ceph_oid_copy(&req->r_base_oid, oid);
4787         ceph_oloc_copy(&req->r_base_oloc, oloc);
4788         req->r_flags = CEPH_OSD_FLAG_READ;
4789 
4790         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4791         if (ret)
4792                 goto out_put_req;
4793 
4794         pages = ceph_alloc_page_vector(1, GFP_NOIO);
4795         if (IS_ERR(pages)) {
4796                 ret = PTR_ERR(pages);
4797                 goto out_put_req;
4798         }
4799 
4800         osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
4801         ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
4802                                                  response_data),
4803                                  pages, PAGE_SIZE, 0, false, true);
4804 
4805         ceph_osdc_start_request(osdc, req, false);
4806         ret = ceph_osdc_wait_request(osdc, req);
4807         if (ret >= 0) {
4808                 void *p = page_address(pages[0]);
4809                 void *const end = p + req->r_ops[0].outdata_len;
4810 
4811                 ret = decode_watchers(&p, end, watchers, num_watchers);
4812         }
4813 
4814 out_put_req:
4815         ceph_osdc_put_request(req);
4816         return ret;
4817 }
4818 EXPORT_SYMBOL(ceph_osdc_list_watchers);
4819 
4820 /*
4821  * Call all pending notify callbacks - for use after a watch is
4822  * unregistered, to make sure no more callbacks for it will be invoked
4823  */
4824 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
4825 {
4826         dout("%s osdc %p\n", __func__, osdc);
4827         flush_workqueue(osdc->notify_wq);
4828 }
4829 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
4830 
4831 void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
4832 {
4833         down_read(&osdc->lock);
4834         maybe_request_map(osdc);
4835         up_read(&osdc->lock);
4836 }
4837 EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
4838 
4839 /*
4840  * Execute an OSD class method on an object.
4841  *
4842  * @flags: CEPH_OSD_FLAG_*
4843  * @resp_len: in/out param for reply length
4844  */
4845 int ceph_osdc_call(struct ceph_osd_client *osdc,
4846                    struct ceph_object_id *oid,
4847                    struct ceph_object_locator *oloc,
4848                    const char *class, const char *method,
4849                    unsigned int flags,
4850                    struct page *req_page, size_t req_len,
4851                    struct page *resp_page, size_t *resp_len)
4852 {
4853         struct ceph_osd_request *req;
4854         int ret;
4855 
4856         if (req_len > PAGE_SIZE || (resp_page && *resp_len > PAGE_SIZE))
4857                 return -E2BIG;
4858 
4859         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4860         if (!req)
4861                 return -ENOMEM;
4862 
4863         ceph_oid_copy(&req->r_base_oid, oid);
4864         ceph_oloc_copy(&req->r_base_oloc, oloc);
4865         req->r_flags = flags;
4866 
4867         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4868         if (ret)
4869                 goto out_put_req;
4870 
4871         osd_req_op_cls_init(req, 0, CEPH_OSD_OP_CALL, class, method);
4872         if (req_page)
4873                 osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
4874                                                   0, false, false);
4875         if (resp_page)
4876                 osd_req_op_cls_response_data_pages(req, 0, &resp_page,
4877                                                    *resp_len, 0, false, false);
4878 
4879         ceph_osdc_start_request(osdc, req, false);
4880         ret = ceph_osdc_wait_request(osdc, req);
4881         if (ret >= 0) {
4882                 ret = req->r_ops[0].rval;
4883                 if (resp_page)
4884                         *resp_len = req->r_ops[0].outdata_len;
4885         }
4886 
4887 out_put_req:
4888         ceph_osdc_put_request(req);
4889         return ret;
4890 }
4891 EXPORT_SYMBOL(ceph_osdc_call);
4892 
4893 /*
4894  * init, shutdown
4895  */
4896 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
4897 {
4898         int err;
4899 
4900         dout("init\n");
4901         osdc->client = client;
4902         init_rwsem(&osdc->lock);
4903         osdc->osds = RB_ROOT;
4904         INIT_LIST_HEAD(&osdc->osd_lru);
4905         spin_lock_init(&osdc->osd_lru_lock);
4906         osd_init(&osdc->homeless_osd);
4907         osdc->homeless_osd.o_osdc = osdc;
4908         osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
4909         osdc->last_linger_id = CEPH_LINGER_ID_START;
4910         osdc->linger_requests = RB_ROOT;
4911         osdc->map_checks = RB_ROOT;
4912         osdc->linger_map_checks = RB_ROOT;
4913         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
4914         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
4915 
4916         err = -ENOMEM;
4917         osdc->osdmap = ceph_osdmap_alloc();
4918         if (!osdc->osdmap)
4919                 goto out;
4920 
4921         osdc->req_mempool = mempool_create_slab_pool(10,
4922                                                      ceph_osd_request_cache);
4923         if (!osdc->req_mempool)
4924                 goto out_map;
4925 
4926         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
4927                                 PAGE_SIZE, 10, true, "osd_op");
4928         if (err < 0)
4929                 goto out_mempool;
4930         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
4931                                 PAGE_SIZE, 10, true, "osd_op_reply");
4932         if (err < 0)
4933                 goto out_msgpool;
4934 
4935         err = -ENOMEM;
4936         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
4937         if (!osdc->notify_wq)
4938                 goto out_msgpool_reply;
4939 
4940         schedule_delayed_work(&osdc->timeout_work,
4941                               osdc->client->options->osd_keepalive_timeout);
4942         schedule_delayed_work(&osdc->osds_timeout_work,
4943             round_jiffies_relative(osdc->client->options->osd_idle_ttl));
4944 
4945         return 0;
4946 
4947 out_msgpool_reply:
4948         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4949 out_msgpool:
4950         ceph_msgpool_destroy(&osdc->msgpool_op);
4951 out_mempool:
4952         mempool_destroy(osdc->req_mempool);
4953 out_map:
4954         ceph_osdmap_destroy(osdc->osdmap);
4955 out:
4956         return err;
4957 }
4958 
4959 void ceph_osdc_stop(struct ceph_osd_client *osdc)
4960 {
4961         flush_workqueue(osdc->notify_wq);
4962         destroy_workqueue(osdc->notify_wq);
4963         cancel_delayed_work_sync(&osdc->timeout_work);
4964         cancel_delayed_work_sync(&osdc->osds_timeout_work);
4965 
4966         down_write(&osdc->lock);
4967         while (!RB_EMPTY_ROOT(&osdc->osds)) {
4968                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
4969                                                 struct ceph_osd, o_node);
4970                 close_osd(osd);
4971         }
4972         up_write(&osdc->lock);
4973         WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
4974         osd_cleanup(&osdc->homeless_osd);
4975 
4976         WARN_ON(!list_empty(&osdc->osd_lru));
4977         WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
4978         WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
4979         WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
4980         WARN_ON(atomic_read(&osdc->num_requests));
4981         WARN_ON(atomic_read(&osdc->num_homeless));
4982 
4983         ceph_osdmap_destroy(osdc->osdmap);
4984         mempool_destroy(osdc->req_mempool);
4985         ceph_msgpool_destroy(&osdc->msgpool_op);
4986         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
4987 }
4988 
4989 /*
4990  * Read some contiguous pages.  If we cross a stripe boundary, shorten
4991  * *plen.  Return number of bytes read, or error.
4992  */
4993 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
4994                         struct ceph_vino vino, struct ceph_file_layout *layout,
4995                         u64 off, u64 *plen,
4996                         u32 truncate_seq, u64 truncate_size,
4997                         struct page **pages, int num_pages, int page_align)
4998 {
4999         struct ceph_osd_request *req;
5000         int rc = 0;
5001 
5002         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
5003              vino.snap, off, *plen);
5004         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
5005                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
5006                                     NULL, truncate_seq, truncate_size,
5007                                     false);
5008         if (IS_ERR(req))
5009                 return PTR_ERR(req);
5010 
5011         /* it may be a short read due to an object boundary */
5012         osd_req_op_extent_osd_data_pages(req, 0,
5013                                 pages, *plen, page_align, false, false);
5014 
5015         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
5016              off, *plen, *plen, page_align);
5017 
5018         rc = ceph_osdc_start_request(osdc, req, false);
5019         if (!rc)
5020                 rc = ceph_osdc_wait_request(osdc, req);
5021 
5022         ceph_osdc_put_request(req);
5023         dout("readpages result %d\n", rc);
5024         return rc;
5025 }
5026 EXPORT_SYMBOL(ceph_osdc_readpages);
5027 
5028 /*
5029  * do a synchronous write on N pages
5030  */
5031 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
5032                          struct ceph_file_layout *layout,
5033                          struct ceph_snap_context *snapc,
5034                          u64 off, u64 len,
5035                          u32 truncate_seq, u64 truncate_size,
5036                          struct timespec *mtime,
5037                          struct page **pages, int num_pages)
5038 {
5039         struct ceph_osd_request *req;
5040         int rc = 0;
5041         int page_align = off & ~PAGE_MASK;
5042 
5043         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
5044                                     CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
5045                                     snapc, truncate_seq, truncate_size,
5046                                     true);
5047         if (IS_ERR(req))
5048                 return PTR_ERR(req);
5049 
5050         /* it may be a short write due to an object boundary */
5051         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
5052                                 false, false);
5053         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
5054 
5055         req->r_mtime = *mtime;
5056         rc = ceph_osdc_start_request(osdc, req, true);
5057         if (!rc)
5058                 rc = ceph_osdc_wait_request(osdc, req);
5059 
5060         ceph_osdc_put_request(req);
5061         if (rc == 0)
5062                 rc = len;
5063         dout("writepages result %d\n", rc);
5064         return rc;
5065 }
5066 EXPORT_SYMBOL(ceph_osdc_writepages);
5067 
5068 int ceph_osdc_setup(void)
5069 {
5070         size_t size = sizeof(struct ceph_osd_request) +
5071             CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
5072 
5073         BUG_ON(ceph_osd_request_cache);
5074         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
5075                                                    0, 0, NULL);
5076 
5077         return ceph_osd_request_cache ? 0 : -ENOMEM;
5078 }
5079 EXPORT_SYMBOL(ceph_osdc_setup);
5080 
5081 void ceph_osdc_cleanup(void)
5082 {
5083         BUG_ON(!ceph_osd_request_cache);
5084         kmem_cache_destroy(ceph_osd_request_cache);
5085         ceph_osd_request_cache = NULL;
5086 }
5087 EXPORT_SYMBOL(ceph_osdc_cleanup);
5088 
5089 /*
5090  * handle incoming message
5091  */
5092 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5093 {
5094         struct ceph_osd *osd = con->private;
5095         struct ceph_osd_client *osdc = osd->o_osdc;
5096         int type = le16_to_cpu(msg->hdr.type);
5097 
5098         switch (type) {
5099         case CEPH_MSG_OSD_MAP:
5100                 ceph_osdc_handle_map(osdc, msg);
5101                 break;
5102         case CEPH_MSG_OSD_OPREPLY:
5103                 handle_reply(osd, msg);
5104                 break;
5105         case CEPH_MSG_OSD_BACKOFF:
5106                 handle_backoff(osd, msg);
5107                 break;
5108         case CEPH_MSG_WATCH_NOTIFY:
5109                 handle_watch_notify(osdc, msg);
5110                 break;
5111 
5112         default:
5113                 pr_err("received unknown message type %d %s\n", type,
5114                        ceph_msg_type_name(type));
5115         }
5116 
5117         ceph_msg_put(msg);
5118 }
5119 
5120 /*
5121  * Lookup and return message for incoming reply.  Don't try to do
5122  * anything about a larger than preallocated data portion of the
5123  * message at the moment - for now, just skip the message.
5124  */
5125 static struct ceph_msg *get_reply(struct ceph_connection *con,
5126                                   struct ceph_msg_header *hdr,
5127                                   int *skip)
5128 {
5129         struct ceph_osd *osd = con->private;
5130         struct ceph_osd_client *osdc = osd->o_osdc;
5131         struct ceph_msg *m = NULL;
5132         struct ceph_osd_request *req;
5133         int front_len = le32_to_cpu(hdr->front_len);
5134         int data_len = le32_to_cpu(hdr->data_len);
5135         u64 tid = le64_to_cpu(hdr->tid);
5136 
5137         down_read(&osdc->lock);
5138         if (!osd_registered(osd)) {
5139                 dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
5140                 *skip = 1;
5141                 goto out_unlock_osdc;
5142         }
5143         WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));
5144 
5145         mutex_lock(&osd->lock);
5146         req = lookup_request(&osd->o_requests, tid);
5147         if (!req) {
5148                 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
5149                      osd->o_osd, tid);
5150                 *skip = 1;
5151                 goto out_unlock_session;
5152         }
5153 
5154         ceph_msg_revoke_incoming(req->r_reply);
5155 
5156         if (front_len > req->r_reply->front_alloc_len) {
5157                 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
5158                         __func__, osd->o_osd, req->r_tid, front_len,
5159                         req->r_reply->front_alloc_len);
5160                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
5161                                  false);
5162                 if (!m)
5163                         goto out_unlock_session;
5164                 ceph_msg_put(req->r_reply);
5165                 req->r_reply = m;
5166         }
5167 
5168         if (data_len > req->r_reply->data_length) {
5169                 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
5170                         __func__, osd->o_osd, req->r_tid, data_len,
5171                         req->r_reply->data_length);
5172                 m = NULL;
5173                 *skip = 1;
5174                 goto out_unlock_session;
5175         }
5176 
5177         m = ceph_msg_get(req->r_reply);
5178         dout("get_reply tid %lld %p\n", tid, m);
5179 
5180 out_unlock_session:
5181         mutex_unlock(&osd->lock);
5182 out_unlock_osdc:
5183         up_read(&osdc->lock);
5184         return m;
5185 }
5186 
5187 /*
5188  * TODO: switch to a msg-owned pagelist
5189  */
5190 static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
5191 {
5192         struct ceph_msg *m;
5193         int type = le16_to_cpu(hdr->type);
5194         u32 front_len = le32_to_cpu(hdr->front_len);
5195         u32 data_len = le32_to_cpu(hdr->data_len);
5196 
5197         m = ceph_msg_new(type, front_len, GFP_NOIO, false);
5198         if (!m)
5199                 return NULL;
5200 
5201         if (data_len) {
5202                 struct page **pages;
5203                 struct ceph_osd_data osd_data;
5204 
5205                 pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
5206                                                GFP_NOIO);
5207                 if (IS_ERR(pages)) {
5208                         ceph_msg_put(m);
5209                         return NULL;
5210                 }
5211 
5212                 ceph_osd_data_pages_init(&osd_data, pages, data_len, 0, false,
5213                                          false);
5214                 ceph_osdc_msg_data_add(m, &osd_data);
5215         }
5216 
5217         return m;
5218 }
5219 
5220 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
5221                                   struct ceph_msg_header *hdr,
5222                                   int *skip)
5223 {
5224         struct ceph_osd *osd = con->private;
5225         int type = le16_to_cpu(hdr->type);
5226 
5227         *skip = 0;
5228         switch (type) {
5229         case CEPH_MSG_OSD_MAP:
5230         case CEPH_MSG_OSD_BACKOFF:
5231         case CEPH_MSG_WATCH_NOTIFY:
5232                 return alloc_msg_with_page_vector(hdr);
5233         case CEPH_MSG_OSD_OPREPLY:
5234                 return get_reply(con, hdr, skip);
5235         default:
5236                 pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
5237                         osd->o_osd, type);
5238                 *skip = 1;
5239                 return NULL;
5240         }
5241 }
5242 
5243 /*
5244  * Wrappers to refcount containing ceph_osd struct
5245  */
5246 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
5247 {
5248         struct ceph_osd *osd = con->private;
5249         if (get_osd(osd))
5250                 return con;
5251         return NULL;
5252 }
5253 
5254 static void put_osd_con(struct ceph_connection *con)
5255 {
5256         struct ceph_osd *osd = con->private;
5257         put_osd(osd);
5258 }
5259 
5260 /*
5261  * authentication
5262  */
5263 /*
5264  * Note: returned pointer is the address of a structure that's
5265  * managed separately.  Caller must *not* attempt to free it.
5266  */
5267 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
5268                                         int *proto, int force_new)
5269 {
5270         struct ceph_osd *o = con->private;
5271         struct ceph_osd_client *osdc = o->o_osdc;
5272         struct ceph_auth_client *ac = osdc->client->monc.auth;
5273         struct ceph_auth_handshake *auth = &o->o_auth;
5274 
5275         if (force_new && auth->authorizer) {
5276                 ceph_auth_destroy_authorizer(auth->authorizer);
5277                 auth->authorizer = NULL;
5278         }
5279         if (!auth->authorizer) {
5280                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5281                                                       auth);
5282                 if (ret)
5283                         return ERR_PTR(ret);
5284         } else {
5285                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
5286                                                      auth);
5287                 if (ret)
5288                         return ERR_PTR(ret);
5289         }
5290         *proto = ac->protocol;
5291 
5292         return auth;
5293 }
5294 
5295 
5296 static int verify_authorizer_reply(struct ceph_connection *con)
5297 {
5298         struct ceph_osd *o = con->private;
5299         struct ceph_osd_client *osdc = o->o_osdc;
5300         struct ceph_auth_client *ac = osdc->client->monc.auth;
5301 
5302         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer);
5303 }
5304 
5305 static int invalidate_authorizer(struct ceph_connection *con)
5306 {
5307         struct ceph_osd *o = con->private;
5308         struct ceph_osd_client *osdc = o->o_osdc;
5309         struct ceph_auth_client *ac = osdc->client->monc.auth;
5310 
5311         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
5312         return ceph_monc_validate_auth(&osdc->client->monc);
5313 }
5314 
5315 static void osd_reencode_message(struct ceph_msg *msg)
5316 {
5317         int type = le16_to_cpu(msg->hdr.type);
5318 
5319         if (type == CEPH_MSG_OSD_OP)
5320                 encode_request_finish(msg);
5321 }
5322 
5323 static int osd_sign_message(struct ceph_msg *msg)
5324 {
5325         struct ceph_osd *o = msg->con->private;
5326         struct ceph_auth_handshake *auth = &o->o_auth;
5327 
5328         return ceph_auth_sign_message(auth, msg);
5329 }
5330 
5331 static int osd_check_message_signature(struct ceph_msg *msg)
5332 {
5333         struct ceph_osd *o = msg->con->private;
5334         struct ceph_auth_handshake *auth = &o->o_auth;
5335 
5336         return ceph_auth_check_message_signature(auth, msg);
5337 }
5338 
5339 static const struct ceph_connection_operations osd_con_ops = {
5340         .get = get_osd_con,
5341         .put = put_osd_con,
5342         .dispatch = dispatch,
5343         .get_authorizer = get_authorizer,
5344         .verify_authorizer_reply = verify_authorizer_reply,
5345         .invalidate_authorizer = invalidate_authorizer,
5346         .alloc_msg = alloc_msg,
5347         .reencode_message = osd_reencode_message,
5348         .sign_message = osd_sign_message,
5349         .check_message_signature = osd_check_message_signature,
5350         .fault = osd_fault,
5351 };
5352 

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