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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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