net/ceph/osd_client.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/err.h>
   6 #include <linux/highmem.h>
   7 #include <linux/mm.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/slab.h>
  10 #include <linux/uaccess.h>
  11 #ifdef CONFIG_BLOCK
  12 #include <linux/bio.h>
  13 #endif
  14
  15 #include <linux/ceph/libceph.h>
  16 #include <linux/ceph/osd_client.h>
  17 #include <linux/ceph/messenger.h>
  18 #include <linux/ceph/decode.h>
  19 #include <linux/ceph/auth.h>
  20 #include <linux/ceph/pagelist.h>
  21
  22 #define OSD_OPREPLY_FRONT_LEN   512
  23
  24 static struct kmem_cache        *ceph_osd_request_cache;
  25
  26 static const struct ceph_connection_operations osd_con_ops;
  27
  28 static void __send_queued(struct ceph_osd_client *osdc);
  29 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  30 static void __register_request(struct ceph_osd_client *osdc,
  31                                struct ceph_osd_request *req);
  32 static void __unregister_request(struct ceph_osd_client *osdc,
  33                                  struct ceph_osd_request *req);
  34 static void __unregister_linger_request(struct ceph_osd_client *osdc,
  35                                         struct ceph_osd_request *req);
  36 static void __enqueue_request(struct ceph_osd_request *req);
  37 static void __send_request(struct ceph_osd_client *osdc,
  38                            struct ceph_osd_request *req);
  39
  40 /*
  41  * Implement client access to distributed object storage cluster.
  42  *
  43  * All data objects are stored within a cluster/cloud of OSDs, or
  44  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  45  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  46  * remote daemons serving up and coordinating consistent and safe
  47  * access to storage.
  48  *
  49  * Cluster membership and the mapping of data objects onto storage devices
  50  * are described by the osd map.
  51  *
  52  * We keep track of pending OSD requests (read, write), resubmit
  53  * requests to different OSDs when the cluster topology/data layout
  54  * change, or retry the affected requests when the communications
  55  * channel with an OSD is reset.
  56  */
  57
  58 /*
  59  * calculate the mapping of a file extent onto an object, and fill out the
  60  * request accordingly.  shorten extent as necessary if it crosses an
  61  * object boundary.
  62  *
  63  * fill osd op in request message.
  64  */
  65 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
  66                         u64 *objnum, u64 *objoff, u64 *objlen)
  67 {
  68         u64 orig_len = *plen;
  69         int r;
  70
  71         /* object extent? */
  72         r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
  73                                           objoff, objlen);
  74         if (r < 0)
  75                 return r;
  76         if (*objlen < orig_len) {
  77                 *plen = *objlen;
  78                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  79                      orig_len - *plen, off, *plen);
  80         }
  81
  82         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
  83
  84         return 0;
  85 }
  86
  87 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
  88 {
  89         memset(osd_data, 0, sizeof (*osd_data));
  90         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
  91 }
  92
  93 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
  94                         struct page **pages, u64 length, u32 alignment,
  95                         bool pages_from_pool, bool own_pages)
  96 {
  97         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
  98         osd_data->pages = pages;
  99         osd_data->length = length;
 100         osd_data->alignment = alignment;
 101         osd_data->pages_from_pool = pages_from_pool;
 102         osd_data->own_pages = own_pages;
 103 }
 104
 105 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
 106                         struct ceph_pagelist *pagelist)
 107 {
 108         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
 109         osd_data->pagelist = pagelist;
 110 }
 111
 112 #ifdef CONFIG_BLOCK
 113 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
 114                         struct bio *bio, size_t bio_length)
 115 {
 116         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
 117         osd_data->bio = bio;
 118         osd_data->bio_length = bio_length;
 119 }
 120 #endif /* CONFIG_BLOCK */
 121
 122 #define osd_req_op_data(oreq, whch, typ, fld)                           \
 123 ({                                                                      \
 124         struct ceph_osd_request *__oreq = (oreq);                       \
 125         unsigned int __whch = (whch);                                   \
 126         BUG_ON(__whch >= __oreq->r_num_ops);                            \
 127         &__oreq->r_ops[__whch].typ.fld;                                 \
 128 })
 129
 130 static struct ceph_osd_data *
 131 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
 132 {
 133         BUG_ON(which >= osd_req->r_num_ops);
 134
 135         return &osd_req->r_ops[which].raw_data_in;
 136 }
 137
 138 struct ceph_osd_data *
 139 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
 140                         unsigned int which)
 141 {
 142         return osd_req_op_data(osd_req, which, extent, osd_data);
 143 }
 144 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
 145
 146 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
 147                         unsigned int which, struct page **pages,
 148                         u64 length, u32 alignment,
 149                         bool pages_from_pool, bool own_pages)
 150 {
 151         struct ceph_osd_data *osd_data;
 152
 153         osd_data = osd_req_op_raw_data_in(osd_req, which);
 154         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 155                                 pages_from_pool, own_pages);
 156 }
 157 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
 158
 159 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
 160                         unsigned int which, struct page **pages,
 161                         u64 length, u32 alignment,
 162                         bool pages_from_pool, bool own_pages)
 163 {
 164         struct ceph_osd_data *osd_data;
 165
 166         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 167         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 168                                 pages_from_pool, own_pages);
 169 }
 170 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
 171
 172 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
 173                         unsigned int which, struct ceph_pagelist *pagelist)
 174 {
 175         struct ceph_osd_data *osd_data;
 176
 177         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 178         ceph_osd_data_pagelist_init(osd_data, pagelist);
 179 }
 180 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
 181
 182 #ifdef CONFIG_BLOCK
 183 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
 184                         unsigned int which, struct bio *bio, size_t bio_length)
 185 {
 186         struct ceph_osd_data *osd_data;
 187
 188         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 189         ceph_osd_data_bio_init(osd_data, bio, bio_length);
 190 }
 191 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
 192 #endif /* CONFIG_BLOCK */
 193
 194 static void osd_req_op_cls_request_info_pagelist(
 195                         struct ceph_osd_request *osd_req,
 196                         unsigned int which, struct ceph_pagelist *pagelist)
 197 {
 198         struct ceph_osd_data *osd_data;
 199
 200         osd_data = osd_req_op_data(osd_req, which, cls, request_info);
 201         ceph_osd_data_pagelist_init(osd_data, pagelist);
 202 }
 203
 204 void osd_req_op_cls_request_data_pagelist(
 205                         struct ceph_osd_request *osd_req,
 206                         unsigned int which, struct ceph_pagelist *pagelist)
 207 {
 208         struct ceph_osd_data *osd_data;
 209
 210         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
 211         ceph_osd_data_pagelist_init(osd_data, pagelist);
 212 }
 213 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
 214
 215 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
 216                         unsigned int which, struct page **pages, u64 length,
 217                         u32 alignment, bool pages_from_pool, bool own_pages)
 218 {
 219         struct ceph_osd_data *osd_data;
 220
 221         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
 222         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 223                                 pages_from_pool, own_pages);
 224 }
 225 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
 226
 227 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
 228                         unsigned int which, struct page **pages, u64 length,
 229                         u32 alignment, bool pages_from_pool, bool own_pages)
 230 {
 231         struct ceph_osd_data *osd_data;
 232
 233         osd_data = osd_req_op_data(osd_req, which, cls, response_data);
 234         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 235                                 pages_from_pool, own_pages);
 236 }
 237 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
 238
 239 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
 240 {
 241         switch (osd_data->type) {
 242         case CEPH_OSD_DATA_TYPE_NONE:
 243                 return 0;
 244         case CEPH_OSD_DATA_TYPE_PAGES:
 245                 return osd_data->length;
 246         case CEPH_OSD_DATA_TYPE_PAGELIST:
 247                 return (u64)osd_data->pagelist->length;
 248 #ifdef CONFIG_BLOCK
 249         case CEPH_OSD_DATA_TYPE_BIO:
 250                 return (u64)osd_data->bio_length;
 251 #endif /* CONFIG_BLOCK */
 252         default:
 253                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
 254                 return 0;
 255         }
 256 }
 257
 258 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 259 {
 260         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
 261                 int num_pages;
 262
 263                 num_pages = calc_pages_for((u64)osd_data->alignment,
 264                                                 (u64)osd_data->length);
 265                 ceph_release_page_vector(osd_data->pages, num_pages);
 266         }
 267         ceph_osd_data_init(osd_data);
 268 }
 269
 270 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
 271                         unsigned int which)
 272 {
 273         struct ceph_osd_req_op *op;
 274
 275         BUG_ON(which >= osd_req->r_num_ops);
 276         op = &osd_req->r_ops[which];
 277
 278         switch (op->op) {
 279         case CEPH_OSD_OP_READ:
 280         case CEPH_OSD_OP_WRITE:
 281         case CEPH_OSD_OP_WRITEFULL:
 282                 ceph_osd_data_release(&op->extent.osd_data);
 283                 break;
 284         case CEPH_OSD_OP_CALL:
 285                 ceph_osd_data_release(&op->cls.request_info);
 286                 ceph_osd_data_release(&op->cls.request_data);
 287                 ceph_osd_data_release(&op->cls.response_data);
 288                 break;
 289         case CEPH_OSD_OP_SETXATTR:
 290         case CEPH_OSD_OP_CMPXATTR:
 291                 ceph_osd_data_release(&op->xattr.osd_data);
 292                 break;
 293         case CEPH_OSD_OP_STAT:
 294                 ceph_osd_data_release(&op->raw_data_in);
 295                 break;
 296         default:
 297                 break;
 298         }
 299 }
 300
 301 /*
 302  * requests
 303  */
 304 static void ceph_osdc_release_request(struct kref *kref)
 305 {
 306         struct ceph_osd_request *req = container_of(kref,
 307                                             struct ceph_osd_request, r_kref);
 308         unsigned int which;
 309
 310         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
 311              req->r_request, req->r_reply);
 312         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
 313         WARN_ON(!list_empty(&req->r_req_lru_item));
 314         WARN_ON(!list_empty(&req->r_osd_item));
 315         WARN_ON(!list_empty(&req->r_linger_item));
 316         WARN_ON(!list_empty(&req->r_linger_osd_item));
 317         WARN_ON(req->r_osd);
 318
 319         if (req->r_request)
 320                 ceph_msg_put(req->r_request);
 321         if (req->r_reply) {
 322                 ceph_msg_revoke_incoming(req->r_reply);
 323                 ceph_msg_put(req->r_reply);
 324         }
 325
 326         for (which = 0; which < req->r_num_ops; which++)
 327                 osd_req_op_data_release(req, which);
 328
 329         ceph_oid_destroy(&req->r_base_oid);
 330         ceph_oid_destroy(&req->r_target_oid);
 331         ceph_put_snap_context(req->r_snapc);
 332
 333         if (req->r_mempool)
 334                 mempool_free(req, req->r_osdc->req_mempool);
 335         else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
 336                 kmem_cache_free(ceph_osd_request_cache, req);
 337         else
 338                 kfree(req);
 339 }
 340
 341 void ceph_osdc_get_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_get(&req->r_kref);
 346 }
 347 EXPORT_SYMBOL(ceph_osdc_get_request);
 348
 349 void ceph_osdc_put_request(struct ceph_osd_request *req)
 350 {
 351         if (req) {
 352                 dout("%s %p (was %d)\n", __func__, req,
 353                      atomic_read(&req->r_kref.refcount));
 354                 kref_put(&req->r_kref, ceph_osdc_release_request);
 355         }
 356 }
 357 EXPORT_SYMBOL(ceph_osdc_put_request);
 358
 359 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 360                                                struct ceph_snap_context *snapc,
 361                                                unsigned int num_ops,
 362                                                bool use_mempool,
 363                                                gfp_t gfp_flags)
 364 {
 365         struct ceph_osd_request *req;
 366
 367         if (use_mempool) {
 368                 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
 369                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 370         } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
 371                 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
 372         } else {
 373                 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
 374                 req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
 375                               gfp_flags);
 376         }
 377         if (unlikely(!req))
 378                 return NULL;
 379
 380         /* req only, each op is zeroed in _osd_req_op_init() */
 381         memset(req, 0, sizeof(*req));
 382
 383         req->r_osdc = osdc;
 384         req->r_mempool = use_mempool;
 385         req->r_num_ops = num_ops;
 386         req->r_snapid = CEPH_NOSNAP;
 387         req->r_snapc = ceph_get_snap_context(snapc);
 388
 389         kref_init(&req->r_kref);
 390         init_completion(&req->r_completion);
 391         init_completion(&req->r_safe_completion);
 392         RB_CLEAR_NODE(&req->r_node);
 393         INIT_LIST_HEAD(&req->r_unsafe_item);
 394         INIT_LIST_HEAD(&req->r_linger_item);
 395         INIT_LIST_HEAD(&req->r_linger_osd_item);
 396         INIT_LIST_HEAD(&req->r_req_lru_item);
 397         INIT_LIST_HEAD(&req->r_osd_item);
 398
 399         ceph_oid_init(&req->r_base_oid);
 400         req->r_base_oloc.pool = -1;
 401         ceph_oid_init(&req->r_target_oid);
 402         req->r_target_oloc.pool = -1;
 403
 404         dout("%s req %p\n", __func__, req);
 405         return req;
 406 }
 407 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 408
 409 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
 410 {
 411         struct ceph_osd_client *osdc = req->r_osdc;
 412         struct ceph_msg *msg;
 413         int msg_size;
 414
 415         WARN_ON(ceph_oid_empty(&req->r_base_oid));
 416
 417         /* create request message */
 418         msg_size = 4 + 4 + 4; /* client_inc, osdmap_epoch, flags */
 419         msg_size += 4 + 4 + 4 + 8; /* mtime, reassert_version */
 420         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
 421         msg_size += 1 + 8 + 4 + 4; /* pgid */
 422         msg_size += 4 + req->r_base_oid.name_len; /* oid */
 423         msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
 424         msg_size += 8; /* snapid */
 425         msg_size += 8; /* snap_seq */
 426         msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
 427         msg_size += 4; /* retry_attempt */
 428
 429         if (req->r_mempool)
 430                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 431         else
 432                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
 433         if (!msg)
 434                 return -ENOMEM;
 435
 436         memset(msg->front.iov_base, 0, msg->front.iov_len);
 437         req->r_request = msg;
 438
 439         /* create reply message */
 440         msg_size = OSD_OPREPLY_FRONT_LEN;
 441         msg_size += req->r_base_oid.name_len;
 442         msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
 443
 444         if (req->r_mempool)
 445                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 446         else
 447                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
 448         if (!msg)
 449                 return -ENOMEM;
 450
 451         req->r_reply = msg;
 452
 453         return 0;
 454 }
 455 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
 456
 457 static bool osd_req_opcode_valid(u16 opcode)
 458 {
 459         switch (opcode) {
 460 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
 461 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
 462 #undef GENERATE_CASE
 463         default:
 464                 return false;
 465         }
 466 }
 467
 468 /*
 469  * This is an osd op init function for opcodes that have no data or
 470  * other information associated with them.  It also serves as a
 471  * common init routine for all the other init functions, below.
 472  */
 473 static struct ceph_osd_req_op *
 474 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 475                  u16 opcode, u32 flags)
 476 {
 477         struct ceph_osd_req_op *op;
 478
 479         BUG_ON(which >= osd_req->r_num_ops);
 480         BUG_ON(!osd_req_opcode_valid(opcode));
 481
 482         op = &osd_req->r_ops[which];
 483         memset(op, 0, sizeof (*op));
 484         op->op = opcode;
 485         op->flags = flags;
 486
 487         return op;
 488 }
 489
 490 void osd_req_op_init(struct ceph_osd_request *osd_req,
 491                      unsigned int which, u16 opcode, u32 flags)
 492 {
 493         (void)_osd_req_op_init(osd_req, which, opcode, flags);
 494 }
 495 EXPORT_SYMBOL(osd_req_op_init);
 496
 497 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 498                                 unsigned int which, u16 opcode,
 499                                 u64 offset, u64 length,
 500                                 u64 truncate_size, u32 truncate_seq)
 501 {
 502         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 503                                                       opcode, 0);
 504         size_t payload_len = 0;
 505
 506         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 507                opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
 508                opcode != CEPH_OSD_OP_TRUNCATE);
 509
 510         op->extent.offset = offset;
 511         op->extent.length = length;
 512         op->extent.truncate_size = truncate_size;
 513         op->extent.truncate_seq = truncate_seq;
 514         if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
 515                 payload_len += length;
 516
 517         op->indata_len = payload_len;
 518 }
 519 EXPORT_SYMBOL(osd_req_op_extent_init);
 520
 521 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 522                                 unsigned int which, u64 length)
 523 {
 524         struct ceph_osd_req_op *op;
 525         u64 previous;
 526
 527         BUG_ON(which >= osd_req->r_num_ops);
 528         op = &osd_req->r_ops[which];
 529         previous = op->extent.length;
 530
 531         if (length == previous)
 532                 return;         /* Nothing to do */
 533         BUG_ON(length > previous);
 534
 535         op->extent.length = length;
 536         op->indata_len -= previous - length;
 537 }
 538 EXPORT_SYMBOL(osd_req_op_extent_update);
 539
 540 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
 541                                 unsigned int which, u64 offset_inc)
 542 {
 543         struct ceph_osd_req_op *op, *prev_op;
 544
 545         BUG_ON(which + 1 >= osd_req->r_num_ops);
 546
 547         prev_op = &osd_req->r_ops[which];
 548         op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
 549         /* dup previous one */
 550         op->indata_len = prev_op->indata_len;
 551         op->outdata_len = prev_op->outdata_len;
 552         op->extent = prev_op->extent;
 553         /* adjust offset */
 554         op->extent.offset += offset_inc;
 555         op->extent.length -= offset_inc;
 556
 557         if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
 558                 op->indata_len -= offset_inc;
 559 }
 560 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
 561
 562 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 563                         u16 opcode, const char *class, const char *method)
 564 {
 565         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 566                                                       opcode, 0);
 567         struct ceph_pagelist *pagelist;
 568         size_t payload_len = 0;
 569         size_t size;
 570
 571         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 572
 573         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 574         BUG_ON(!pagelist);
 575         ceph_pagelist_init(pagelist);
 576
 577         op->cls.class_name = class;
 578         size = strlen(class);
 579         BUG_ON(size > (size_t) U8_MAX);
 580         op->cls.class_len = size;
 581         ceph_pagelist_append(pagelist, class, size);
 582         payload_len += size;
 583
 584         op->cls.method_name = method;
 585         size = strlen(method);
 586         BUG_ON(size > (size_t) U8_MAX);
 587         op->cls.method_len = size;
 588         ceph_pagelist_append(pagelist, method, size);
 589         payload_len += size;
 590
 591         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 592
 593         op->cls.argc = 0;       /* currently unused */
 594
 595         op->indata_len = payload_len;
 596 }
 597 EXPORT_SYMBOL(osd_req_op_cls_init);
 598
 599 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
 600                           u16 opcode, const char *name, const void *value,
 601                           size_t size, u8 cmp_op, u8 cmp_mode)
 602 {
 603         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 604                                                       opcode, 0);
 605         struct ceph_pagelist *pagelist;
 606         size_t payload_len;
 607
 608         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
 609
 610         pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
 611         if (!pagelist)
 612                 return -ENOMEM;
 613
 614         ceph_pagelist_init(pagelist);
 615
 616         payload_len = strlen(name);
 617         op->xattr.name_len = payload_len;
 618         ceph_pagelist_append(pagelist, name, payload_len);
 619
 620         op->xattr.value_len = size;
 621         ceph_pagelist_append(pagelist, value, size);
 622         payload_len += size;
 623
 624         op->xattr.cmp_op = cmp_op;
 625         op->xattr.cmp_mode = cmp_mode;
 626
 627         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
 628         op->indata_len = payload_len;
 629         return 0;
 630 }
 631 EXPORT_SYMBOL(osd_req_op_xattr_init);
 632
 633 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 634                                 unsigned int which, u16 opcode,
 635                                 u64 cookie, u64 version, int flag)
 636 {
 637         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 638                                                       opcode, 0);
 639
 640         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 641
 642         op->watch.cookie = cookie;
 643         op->watch.ver = version;
 644         if (opcode == CEPH_OSD_OP_WATCH && flag)
 645                 op->watch.flag = (u8)1;
 646 }
 647 EXPORT_SYMBOL(osd_req_op_watch_init);
 648
 649 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
 650                                 unsigned int which,
 651                                 u64 expected_object_size,
 652                                 u64 expected_write_size)
 653 {
 654         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 655                                                       CEPH_OSD_OP_SETALLOCHINT,
 656                                                       0);
 657
 658         op->alloc_hint.expected_object_size = expected_object_size;
 659         op->alloc_hint.expected_write_size = expected_write_size;
 660
 661         /*
 662          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
 663          * not worth a feature bit.  Set FAILOK per-op flag to make
 664          * sure older osds don't trip over an unsupported opcode.
 665          */
 666         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
 667 }
 668 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
 669
 670 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 671                                 struct ceph_osd_data *osd_data)
 672 {
 673         u64 length = ceph_osd_data_length(osd_data);
 674
 675         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 676                 BUG_ON(length > (u64) SIZE_MAX);
 677                 if (length)
 678                         ceph_msg_data_add_pages(msg, osd_data->pages,
 679                                         length, osd_data->alignment);
 680         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 681                 BUG_ON(!length);
 682                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 683 #ifdef CONFIG_BLOCK
 684         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
 685                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
 686 #endif
 687         } else {
 688                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
 689         }
 690 }
 691
 692 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 693                               struct ceph_osd_op *dst, unsigned int which)
 694 {
 695         struct ceph_osd_req_op *src;
 696         struct ceph_osd_data *osd_data;
 697         u64 request_data_len = 0;
 698         u64 data_length;
 699
 700         BUG_ON(which >= req->r_num_ops);
 701         src = &req->r_ops[which];
 702         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 703                 pr_err("unrecognized osd opcode %d\n", src->op);
 704
 705                 return 0;
 706         }
 707
 708         switch (src->op) {
 709         case CEPH_OSD_OP_STAT:
 710                 osd_data = &src->raw_data_in;
 711                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 712                 break;
 713         case CEPH_OSD_OP_READ:
 714         case CEPH_OSD_OP_WRITE:
 715         case CEPH_OSD_OP_WRITEFULL:
 716         case CEPH_OSD_OP_ZERO:
 717         case CEPH_OSD_OP_TRUNCATE:
 718                 if (src->op == CEPH_OSD_OP_WRITE ||
 719                     src->op == CEPH_OSD_OP_WRITEFULL)
 720                         request_data_len = src->extent.length;
 721                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 722                 dst->extent.length = cpu_to_le64(src->extent.length);
 723                 dst->extent.truncate_size =
 724                         cpu_to_le64(src->extent.truncate_size);
 725                 dst->extent.truncate_seq =
 726                         cpu_to_le32(src->extent.truncate_seq);
 727                 osd_data = &src->extent.osd_data;
 728                 if (src->op == CEPH_OSD_OP_WRITE ||
 729                     src->op == CEPH_OSD_OP_WRITEFULL)
 730                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 731                 else
 732                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
 733                 break;
 734         case CEPH_OSD_OP_CALL:
 735                 dst->cls.class_len = src->cls.class_len;
 736                 dst->cls.method_len = src->cls.method_len;
 737                 osd_data = &src->cls.request_info;
 738                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 739                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
 740                 request_data_len = osd_data->pagelist->length;
 741
 742                 osd_data = &src->cls.request_data;
 743                 data_length = ceph_osd_data_length(osd_data);
 744                 if (data_length) {
 745                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
 746                         dst->cls.indata_len = cpu_to_le32(data_length);
 747                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 748                         src->indata_len += data_length;
 749                         request_data_len += data_length;
 750                 }
 751                 osd_data = &src->cls.response_data;
 752                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 753                 break;
 754         case CEPH_OSD_OP_STARTSYNC:
 755                 break;
 756         case CEPH_OSD_OP_NOTIFY_ACK:
 757         case CEPH_OSD_OP_WATCH:
 758                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 759                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 760                 dst->watch.flag = src->watch.flag;
 761                 break;
 762         case CEPH_OSD_OP_SETALLOCHINT:
 763                 dst->alloc_hint.expected_object_size =
 764                     cpu_to_le64(src->alloc_hint.expected_object_size);
 765                 dst->alloc_hint.expected_write_size =
 766                     cpu_to_le64(src->alloc_hint.expected_write_size);
 767                 break;
 768         case CEPH_OSD_OP_SETXATTR:
 769         case CEPH_OSD_OP_CMPXATTR:
 770                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 771                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 772                 dst->xattr.cmp_op = src->xattr.cmp_op;
 773                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 774                 osd_data = &src->xattr.osd_data;
 775                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 776                 request_data_len = osd_data->pagelist->length;
 777                 break;
 778         case CEPH_OSD_OP_CREATE:
 779         case CEPH_OSD_OP_DELETE:
 780                 break;
 781         default:
 782                 pr_err("unsupported osd opcode %s\n",
 783                         ceph_osd_op_name(src->op));
 784                 WARN_ON(1);
 785
 786                 return 0;
 787         }
 788
 789         dst->op = cpu_to_le16(src->op);
 790         dst->flags = cpu_to_le32(src->flags);
 791         dst->payload_len = cpu_to_le32(src->indata_len);
 792
 793         return request_data_len;
 794 }
 795
 796 /*
 797  * build new request AND message, calculate layout, and adjust file
 798  * extent as needed.
 799  *
 800  * if the file was recently truncated, we include information about its
 801  * old and new size so that the object can be updated appropriately.  (we
 802  * avoid synchronously deleting truncated objects because it's slow.)
 803  *
 804  * if @do_sync, include a 'startsync' command so that the osd will flush
 805  * data quickly.
 806  */
 807 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 808                                                struct ceph_file_layout *layout,
 809                                                struct ceph_vino vino,
 810                                                u64 off, u64 *plen,
 811                                                unsigned int which, int num_ops,
 812                                                int opcode, int flags,
 813                                                struct ceph_snap_context *snapc,
 814                                                u32 truncate_seq,
 815                                                u64 truncate_size,
 816                                                bool use_mempool)
 817 {
 818         struct ceph_osd_request *req;
 819         u64 objnum = 0;
 820         u64 objoff = 0;
 821         u64 objlen = 0;
 822         int r;
 823
 824         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 825                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
 826                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
 827
 828         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 829                                         GFP_NOFS);
 830         if (!req) {
 831                 r = -ENOMEM;
 832                 goto fail;
 833         }
 834
 835         req->r_flags = flags;
 836
 837         /* calculate max write size */
 838         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 839         if (r)
 840                 goto fail;
 841
 842         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
 843                 osd_req_op_init(req, which, opcode, 0);
 844         } else {
 845                 u32 object_size = le32_to_cpu(layout->fl_object_size);
 846                 u32 object_base = off - objoff;
 847                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
 848                         if (truncate_size <= object_base) {
 849                                 truncate_size = 0;
 850                         } else {
 851                                 truncate_size -= object_base;
 852                                 if (truncate_size > object_size)
 853                                         truncate_size = object_size;
 854                         }
 855                 }
 856                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
 857                                        truncate_size, truncate_seq);
 858         }
 859
 860         req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
 861         ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
 862
 863         r = ceph_osdc_alloc_messages(req, GFP_NOFS);
 864         if (r)
 865                 goto fail;
 866
 867         return req;
 868
 869 fail:
 870         ceph_osdc_put_request(req);
 871         return ERR_PTR(r);
 872 }
 873 EXPORT_SYMBOL(ceph_osdc_new_request);
 874
 875 /*
 876  * We keep osd requests in an rbtree, sorted by ->r_tid.
 877  */
 878 static void __insert_request(struct ceph_osd_client *osdc,
 879                              struct ceph_osd_request *new)
 880 {
 881         struct rb_node **p = &osdc->requests.rb_node;
 882         struct rb_node *parent = NULL;
 883         struct ceph_osd_request *req = NULL;
 884
 885         while (*p) {
 886                 parent = *p;
 887                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 888                 if (new->r_tid < req->r_tid)
 889                         p = &(*p)->rb_left;
 890                 else if (new->r_tid > req->r_tid)
 891                         p = &(*p)->rb_right;
 892                 else
 893                         BUG();
 894         }
 895
 896         rb_link_node(&new->r_node, parent, p);
 897         rb_insert_color(&new->r_node, &osdc->requests);
 898 }
 899
 900 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 901                                                  u64 tid)
 902 {
 903         struct ceph_osd_request *req;
 904         struct rb_node *n = osdc->requests.rb_node;
 905
 906         while (n) {
 907                 req = rb_entry(n, struct ceph_osd_request, r_node);
 908                 if (tid < req->r_tid)
 909                         n = n->rb_left;
 910                 else if (tid > req->r_tid)
 911                         n = n->rb_right;
 912                 else
 913                         return req;
 914         }
 915         return NULL;
 916 }
 917
 918 static struct ceph_osd_request *
 919 __lookup_request_ge(struct ceph_osd_client *osdc,
 920                     u64 tid)
 921 {
 922         struct ceph_osd_request *req;
 923         struct rb_node *n = osdc->requests.rb_node;
 924
 925         while (n) {
 926                 req = rb_entry(n, struct ceph_osd_request, r_node);
 927                 if (tid < req->r_tid) {
 928                         if (!n->rb_left)
 929                                 return req;
 930                         n = n->rb_left;
 931                 } else if (tid > req->r_tid) {
 932                         n = n->rb_right;
 933                 } else {
 934                         return req;
 935                 }
 936         }
 937         return NULL;
 938 }
 939
 940 static void __kick_linger_request(struct ceph_osd_request *req)
 941 {
 942         struct ceph_osd_client *osdc = req->r_osdc;
 943         struct ceph_osd *osd = req->r_osd;
 944
 945         /*
 946          * Linger requests need to be resent with a new tid to avoid
 947          * the dup op detection logic on the OSDs.  Achieve this with
 948          * a re-register dance instead of open-coding.
 949          */
 950         ceph_osdc_get_request(req);
 951         if (!list_empty(&req->r_linger_item))
 952                 __unregister_linger_request(osdc, req);
 953         else
 954                 __unregister_request(osdc, req);
 955         __register_request(osdc, req);
 956         ceph_osdc_put_request(req);
 957
 958         /*
 959          * Unless request has been registered as both normal and
 960          * lingering, __unregister{,_linger}_request clears r_osd.
 961          * However, here we need to preserve r_osd to make sure we
 962          * requeue on the same OSD.
 963          */
 964         WARN_ON(req->r_osd || !osd);
 965         req->r_osd = osd;
 966
 967         dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
 968         __enqueue_request(req);
 969 }
 970
 971 /*
 972  * Resubmit requests pending on the given osd.
 973  */
 974 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 975                                 struct ceph_osd *osd)
 976 {
 977         struct ceph_osd_request *req, *nreq;
 978         LIST_HEAD(resend);
 979         LIST_HEAD(resend_linger);
 980         int err;
 981
 982         dout("%s osd%d\n", __func__, osd->o_osd);
 983         err = __reset_osd(osdc, osd);
 984         if (err)
 985                 return;
 986
 987         /*
 988          * Build up a list of requests to resend by traversing the
 989          * osd's list of requests.  Requests for a given object are
 990          * sent in tid order, and that is also the order they're
 991          * kept on this list.  Therefore all requests that are in
 992          * flight will be found first, followed by all requests that
 993          * have not yet been sent.  And to resend requests while
 994          * preserving this order we will want to put any sent
 995          * requests back on the front of the osd client's unsent
 996          * list.
 997          *
 998          * So we build a separate ordered list of already-sent
 999          * requests for the affected osd and splice it onto the
1000          * front of the osd client's unsent list.  Once we've seen a
1001          * request that has not yet been sent we're done.  Those
1002          * requests are already sitting right where they belong.
1003          */
1004         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
1005                 if (!req->r_sent)
1006                         break;
1007
1008                 if (!req->r_linger) {
1009                         dout("%s requeueing %p tid %llu\n", __func__, req,
1010                              req->r_tid);
1011                         list_move_tail(&req->r_req_lru_item, &resend);
1012                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
1013                 } else {
1014                         list_move_tail(&req->r_req_lru_item, &resend_linger);
1015                 }
1016         }
1017         list_splice(&resend, &osdc->req_unsent);
1018
1019         /*
1020          * Both registered and not yet registered linger requests are
1021          * enqueued with a new tid on the same OSD.  We add/move them
1022          * to req_unsent/o_requests at the end to keep things in tid
1023          * order.
1024          */
1025         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
1026                                  r_linger_osd_item) {
1027                 WARN_ON(!list_empty(&req->r_req_lru_item));
1028                 __kick_linger_request(req);
1029         }
1030
1031         list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
1032                 __kick_linger_request(req);
1033 }
1034
1035 /*
1036  * If the osd connection drops, we need to resubmit all requests.
1037  */
1038 static void osd_reset(struct ceph_connection *con)
1039 {
1040         struct ceph_osd *osd = con->private;
1041         struct ceph_osd_client *osdc;
1042
1043         if (!osd)
1044                 return;
1045         dout("osd_reset osd%d\n", osd->o_osd);
1046         osdc = osd->o_osdc;
1047         down_read(&osdc->map_sem);
1048         mutex_lock(&osdc->request_mutex);
1049         __kick_osd_requests(osdc, osd);
1050         __send_queued(osdc);
1051         mutex_unlock(&osdc->request_mutex);
1052         up_read(&osdc->map_sem);
1053 }
1054
1055 /*
1056  * Track open sessions with osds.
1057  */
1058 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1059 {
1060         struct ceph_osd *osd;
1061
1062         osd = kzalloc(sizeof(*osd), GFP_NOFS);
1063         if (!osd)
1064                 return NULL;
1065
1066         atomic_set(&osd->o_ref, 1);
1067         osd->o_osdc = osdc;
1068         osd->o_osd = onum;
1069         RB_CLEAR_NODE(&osd->o_node);
1070         INIT_LIST_HEAD(&osd->o_requests);
1071         INIT_LIST_HEAD(&osd->o_linger_requests);
1072         INIT_LIST_HEAD(&osd->o_osd_lru);
1073         osd->o_incarnation = 1;
1074
1075         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1076
1077         INIT_LIST_HEAD(&osd->o_keepalive_item);
1078         return osd;
1079 }
1080
1081 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1082 {
1083         if (atomic_inc_not_zero(&osd->o_ref)) {
1084                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1085                      atomic_read(&osd->o_ref));
1086                 return osd;
1087         } else {
1088                 dout("get_osd %p FAIL\n", osd);
1089                 return NULL;
1090         }
1091 }
1092
1093 static void put_osd(struct ceph_osd *osd)
1094 {
1095         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1096              atomic_read(&osd->o_ref) - 1);
1097         if (atomic_dec_and_test(&osd->o_ref)) {
1098                 if (osd->o_auth.authorizer)
1099                         ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1100                 kfree(osd);
1101         }
1102 }
1103
1104 /*
1105  * remove an osd from our map
1106  */
1107 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1108 {
1109         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1110         WARN_ON(!list_empty(&osd->o_requests));
1111         WARN_ON(!list_empty(&osd->o_linger_requests));
1112
1113         list_del_init(&osd->o_osd_lru);
1114         rb_erase(&osd->o_node, &osdc->osds);
1115         RB_CLEAR_NODE(&osd->o_node);
1116 }
1117
1118 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1119 {
1120         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1121
1122         if (!RB_EMPTY_NODE(&osd->o_node)) {
1123                 ceph_con_close(&osd->o_con);
1124                 __remove_osd(osdc, osd);
1125                 put_osd(osd);
1126         }
1127 }
1128
1129 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1130                               struct ceph_osd *osd)
1131 {
1132         dout("%s %p\n", __func__, osd);
1133         BUG_ON(!list_empty(&osd->o_osd_lru));
1134
1135         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1136         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1137 }
1138
1139 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1140                                   struct ceph_osd *osd)
1141 {
1142         dout("%s %p\n", __func__, osd);
1143
1144         if (list_empty(&osd->o_requests) &&
1145             list_empty(&osd->o_linger_requests))
1146                 __move_osd_to_lru(osdc, osd);
1147 }
1148
1149 static void __remove_osd_from_lru(struct ceph_osd *osd)
1150 {
1151         dout("__remove_osd_from_lru %p\n", osd);
1152         if (!list_empty(&osd->o_osd_lru))
1153                 list_del_init(&osd->o_osd_lru);
1154 }
1155
1156 /*
1157  * reset osd connect
1158  */
1159 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1160 {
1161         struct ceph_entity_addr *peer_addr;
1162
1163         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1164         if (list_empty(&osd->o_requests) &&
1165             list_empty(&osd->o_linger_requests)) {
1166                 remove_osd(osdc, osd);
1167                 return -ENODEV;
1168         }
1169
1170         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1171         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1172                         !ceph_con_opened(&osd->o_con)) {
1173                 struct ceph_osd_request *req;
1174
1175                 dout("osd addr hasn't changed and connection never opened, "
1176                      "letting msgr retry\n");
1177                 /* touch each r_stamp for handle_timeout()'s benfit */
1178                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1179                         req->r_stamp = jiffies;
1180
1181                 return -EAGAIN;
1182         }
1183
1184         ceph_con_close(&osd->o_con);
1185         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1186         osd->o_incarnation++;
1187
1188         return 0;
1189 }
1190
1191 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1192 {
1193         struct rb_node **p = &osdc->osds.rb_node;
1194         struct rb_node *parent = NULL;
1195         struct ceph_osd *osd = NULL;
1196
1197         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1198         while (*p) {
1199                 parent = *p;
1200                 osd = rb_entry(parent, struct ceph_osd, o_node);
1201                 if (new->o_osd < osd->o_osd)
1202                         p = &(*p)->rb_left;
1203                 else if (new->o_osd > osd->o_osd)
1204                         p = &(*p)->rb_right;
1205                 else
1206                         BUG();
1207         }
1208
1209         rb_link_node(&new->o_node, parent, p);
1210         rb_insert_color(&new->o_node, &osdc->osds);
1211 }
1212
1213 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1214 {
1215         struct ceph_osd *osd;
1216         struct rb_node *n = osdc->osds.rb_node;
1217
1218         while (n) {
1219                 osd = rb_entry(n, struct ceph_osd, o_node);
1220                 if (o < osd->o_osd)
1221                         n = n->rb_left;
1222                 else if (o > osd->o_osd)
1223                         n = n->rb_right;
1224                 else
1225                         return osd;
1226         }
1227         return NULL;
1228 }
1229
1230 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1231 {
1232         schedule_delayed_work(&osdc->timeout_work,
1233                               osdc->client->options->osd_keepalive_timeout);
1234 }
1235
1236 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1237 {
1238         cancel_delayed_work(&osdc->timeout_work);
1239 }
1240
1241 /*
1242  * Register request, assign tid.  If this is the first request, set up
1243  * the timeout event.
1244  */
1245 static void __register_request(struct ceph_osd_client *osdc,
1246                                struct ceph_osd_request *req)
1247 {
1248         req->r_tid = ++osdc->last_tid;
1249         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1250         dout("__register_request %p tid %lld\n", req, req->r_tid);
1251         __insert_request(osdc, req);
1252         ceph_osdc_get_request(req);
1253         osdc->num_requests++;
1254         if (osdc->num_requests == 1) {
1255                 dout(" first request, scheduling timeout\n");
1256                 __schedule_osd_timeout(osdc);
1257         }
1258 }
1259
1260 /*
1261  * called under osdc->request_mutex
1262  */
1263 static void __unregister_request(struct ceph_osd_client *osdc,
1264                                  struct ceph_osd_request *req)
1265 {
1266         if (RB_EMPTY_NODE(&req->r_node)) {
1267                 dout("__unregister_request %p tid %lld not registered\n",
1268                         req, req->r_tid);
1269                 return;
1270         }
1271
1272         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1273         rb_erase(&req->r_node, &osdc->requests);
1274         RB_CLEAR_NODE(&req->r_node);
1275         osdc->num_requests--;
1276
1277         if (req->r_osd) {
1278                 /* make sure the original request isn't in flight. */
1279                 ceph_msg_revoke(req->r_request);
1280
1281                 list_del_init(&req->r_osd_item);
1282                 maybe_move_osd_to_lru(osdc, req->r_osd);
1283                 if (list_empty(&req->r_linger_osd_item))
1284                         req->r_osd = NULL;
1285         }
1286
1287         list_del_init(&req->r_req_lru_item);
1288         ceph_osdc_put_request(req);
1289
1290         if (osdc->num_requests == 0) {
1291                 dout(" no requests, canceling timeout\n");
1292                 __cancel_osd_timeout(osdc);
1293         }
1294 }
1295
1296 /*
1297  * Cancel a previously queued request message
1298  */
1299 static void __cancel_request(struct ceph_osd_request *req)
1300 {
1301         if (req->r_sent && req->r_osd) {
1302                 ceph_msg_revoke(req->r_request);
1303                 req->r_sent = 0;
1304         }
1305 }
1306
1307 static void __register_linger_request(struct ceph_osd_client *osdc,
1308                                     struct ceph_osd_request *req)
1309 {
1310         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1311         WARN_ON(!req->r_linger);
1312
1313         ceph_osdc_get_request(req);
1314         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1315         if (req->r_osd)
1316                 list_add_tail(&req->r_linger_osd_item,
1317                               &req->r_osd->o_linger_requests);
1318 }
1319
1320 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1321                                         struct ceph_osd_request *req)
1322 {
1323         WARN_ON(!req->r_linger);
1324
1325         if (list_empty(&req->r_linger_item)) {
1326                 dout("%s %p tid %llu not registered\n", __func__, req,
1327                      req->r_tid);
1328                 return;
1329         }
1330
1331         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1332         list_del_init(&req->r_linger_item);
1333
1334         if (req->r_osd) {
1335                 list_del_init(&req->r_linger_osd_item);
1336                 maybe_move_osd_to_lru(osdc, req->r_osd);
1337                 if (list_empty(&req->r_osd_item))
1338                         req->r_osd = NULL;
1339         }
1340         ceph_osdc_put_request(req);
1341 }
1342
1343 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1344                                   struct ceph_osd_request *req)
1345 {
1346         if (!req->r_linger) {
1347                 dout("set_request_linger %p\n", req);
1348                 req->r_linger = 1;
1349         }
1350 }
1351 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1352
1353 /*
1354  * Returns whether a request should be blocked from being sent
1355  * based on the current osdmap and osd_client settings.
1356  *
1357  * Caller should hold map_sem for read.
1358  */
1359 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1360                                    struct ceph_osd_request *req)
1361 {
1362         bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1363         bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1364                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1365         return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1366                 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1367 }
1368
1369 /*
1370  * Calculate mapping of a request to a PG.  Takes tiering into account.
1371  */
1372 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1373                              struct ceph_osd_request *req,
1374                              struct ceph_pg *pg_out)
1375 {
1376         bool need_check_tiering;
1377
1378         need_check_tiering = false;
1379         if (req->r_target_oloc.pool == -1) {
1380                 req->r_target_oloc = req->r_base_oloc; /* struct */
1381                 need_check_tiering = true;
1382         }
1383         if (ceph_oid_empty(&req->r_target_oid)) {
1384                 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1385                 need_check_tiering = true;
1386         }
1387
1388         if (need_check_tiering &&
1389             (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1390                 struct ceph_pg_pool_info *pi;
1391
1392                 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1393                 if (pi) {
1394                         if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1395                             pi->read_tier >= 0)
1396                                 req->r_target_oloc.pool = pi->read_tier;
1397                         if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1398                             pi->write_tier >= 0)
1399                                 req->r_target_oloc.pool = pi->write_tier;
1400                 }
1401                 /* !pi is caught in ceph_oloc_oid_to_pg() */
1402         }
1403
1404         return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1405                                    &req->r_target_oid, pg_out);
1406 }
1407
1408 static void __enqueue_request(struct ceph_osd_request *req)
1409 {
1410         struct ceph_osd_client *osdc = req->r_osdc;
1411
1412         dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1413              req->r_osd ? req->r_osd->o_osd : -1);
1414
1415         if (req->r_osd) {
1416                 __remove_osd_from_lru(req->r_osd);
1417                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1418                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1419         } else {
1420                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1421         }
1422 }
1423
1424 /*
1425  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1426  * (as needed), and set the request r_osd appropriately.  If there is
1427  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1428  * (unsent, homeless) or leave on in-flight lru.
1429  *
1430  * Return 0 if unchanged, 1 if changed, or negative on error.
1431  *
1432  * Caller should hold map_sem for read and request_mutex.
1433  */
1434 static int __map_request(struct ceph_osd_client *osdc,
1435                          struct ceph_osd_request *req, int force_resend)
1436 {
1437         struct ceph_pg pgid;
1438         int acting[CEPH_PG_MAX_SIZE];
1439         int num, o;
1440         int err;
1441         bool was_paused;
1442
1443         dout("map_request %p tid %lld\n", req, req->r_tid);
1444
1445         err = __calc_request_pg(osdc->osdmap, req, &pgid);
1446         if (err) {
1447                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1448                 return err;
1449         }
1450         req->r_pgid = pgid;
1451
1452         num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1453         if (num < 0)
1454                 num = 0;
1455
1456         was_paused = req->r_paused;
1457         req->r_paused = __req_should_be_paused(osdc, req);
1458         if (was_paused && !req->r_paused)
1459                 force_resend = 1;
1460
1461         if ((!force_resend &&
1462              req->r_osd && req->r_osd->o_osd == o &&
1463              req->r_sent >= req->r_osd->o_incarnation &&
1464              req->r_num_pg_osds == num &&
1465              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1466             (req->r_osd == NULL && o == -1) ||
1467             req->r_paused)
1468                 return 0;  /* no change */
1469
1470         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1471              req->r_tid, pgid.pool, pgid.seed, o,
1472              req->r_osd ? req->r_osd->o_osd : -1);
1473
1474         /* record full pg acting set */
1475         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1476         req->r_num_pg_osds = num;
1477
1478         if (req->r_osd) {
1479                 __cancel_request(req);
1480                 list_del_init(&req->r_osd_item);
1481                 list_del_init(&req->r_linger_osd_item);
1482                 req->r_osd = NULL;
1483         }
1484
1485         req->r_osd = __lookup_osd(osdc, o);
1486         if (!req->r_osd && o >= 0) {
1487                 err = -ENOMEM;
1488                 req->r_osd = create_osd(osdc, o);
1489                 if (!req->r_osd) {
1490                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1491                         goto out;
1492                 }
1493
1494                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1495                 __insert_osd(osdc, req->r_osd);
1496
1497                 ceph_con_open(&req->r_osd->o_con,
1498                               CEPH_ENTITY_TYPE_OSD, o,
1499                               &osdc->osdmap->osd_addr[o]);
1500         }
1501
1502         __enqueue_request(req);
1503         err = 1;   /* osd or pg changed */
1504
1505 out:
1506         return err;
1507 }
1508
1509 /*
1510  * caller should hold map_sem (for read) and request_mutex
1511  */
1512 static void __send_request(struct ceph_osd_client *osdc,
1513                            struct ceph_osd_request *req)
1514 {
1515         void *p;
1516
1517         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1518              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1519              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1520
1521         /* fill in message content that changes each time we send it */
1522         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1523         put_unaligned_le32(req->r_flags, req->r_request_flags);
1524         put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1525         p = req->r_request_pgid;
1526         ceph_encode_64(&p, req->r_pgid.pool);
1527         ceph_encode_32(&p, req->r_pgid.seed);
1528         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1529         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1530                sizeof(req->r_reassert_version));
1531
1532         req->r_stamp = jiffies;
1533         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1534
1535         ceph_msg_get(req->r_request); /* send consumes a ref */
1536
1537         req->r_sent = req->r_osd->o_incarnation;
1538
1539         ceph_con_send(&req->r_osd->o_con, req->r_request);
1540 }
1541
1542 /*
1543  * Send any requests in the queue (req_unsent).
1544  */
1545 static void __send_queued(struct ceph_osd_client *osdc)
1546 {
1547         struct ceph_osd_request *req, *tmp;
1548
1549         dout("__send_queued\n");
1550         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1551                 __send_request(osdc, req);
1552 }
1553
1554 /*
1555  * Caller should hold map_sem for read and request_mutex.
1556  */
1557 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1558                                      struct ceph_osd_request *req,
1559                                      bool nofail)
1560 {
1561         int rc;
1562
1563         __register_request(osdc, req);
1564         req->r_sent = 0;
1565         req->r_got_reply = 0;
1566         rc = __map_request(osdc, req, 0);
1567         if (rc < 0) {
1568                 if (nofail) {
1569                         dout("osdc_start_request failed map, "
1570                                 " will retry %lld\n", req->r_tid);
1571                         rc = 0;
1572                 } else {
1573                         __unregister_request(osdc, req);
1574                 }
1575                 return rc;
1576         }
1577
1578         if (req->r_osd == NULL) {
1579                 dout("send_request %p no up osds in pg\n", req);
1580                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1581         } else {
1582                 __send_queued(osdc);
1583         }
1584
1585         return 0;
1586 }
1587
1588 /*
1589  * Timeout callback, called every N seconds when 1 or more osd
1590  * requests has been active for more than N seconds.  When this
1591  * happens, we ping all OSDs with requests who have timed out to
1592  * ensure any communications channel reset is detected.  Reset the
1593  * request timeouts another N seconds in the future as we go.
1594  * Reschedule the timeout event another N seconds in future (unless
1595  * there are no open requests).
1596  */
1597 static void handle_timeout(struct work_struct *work)
1598 {
1599         struct ceph_osd_client *osdc =
1600                 container_of(work, struct ceph_osd_client, timeout_work.work);
1601         struct ceph_options *opts = osdc->client->options;
1602         struct ceph_osd_request *req;
1603         struct ceph_osd *osd;
1604         struct list_head slow_osds;
1605         dout("timeout\n");
1606         down_read(&osdc->map_sem);
1607
1608         ceph_monc_request_next_osdmap(&osdc->client->monc);
1609
1610         mutex_lock(&osdc->request_mutex);
1611
1612         /*
1613          * ping osds that are a bit slow.  this ensures that if there
1614          * is a break in the TCP connection we will notice, and reopen
1615          * a connection with that osd (from the fault callback).
1616          */
1617         INIT_LIST_HEAD(&slow_osds);
1618         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1619                 if (time_before(jiffies,
1620                                 req->r_stamp + opts->osd_keepalive_timeout))
1621                         break;
1622
1623                 osd = req->r_osd;
1624                 BUG_ON(!osd);
1625                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1626                      req->r_tid, osd->o_osd);
1627                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1628         }
1629         while (!list_empty(&slow_osds)) {
1630                 osd = list_entry(slow_osds.next, struct ceph_osd,
1631                                  o_keepalive_item);
1632                 list_del_init(&osd->o_keepalive_item);
1633                 ceph_con_keepalive(&osd->o_con);
1634         }
1635
1636         __schedule_osd_timeout(osdc);
1637         __send_queued(osdc);
1638         mutex_unlock(&osdc->request_mutex);
1639         up_read(&osdc->map_sem);
1640 }
1641
1642 static void handle_osds_timeout(struct work_struct *work)
1643 {
1644         struct ceph_osd_client *osdc =
1645                 container_of(work, struct ceph_osd_client,
1646                              osds_timeout_work.work);
1647         unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
1648         struct ceph_osd *osd, *nosd;
1649
1650         dout("%s osdc %p\n", __func__, osdc);
1651         down_read(&osdc->map_sem);
1652         mutex_lock(&osdc->request_mutex);
1653
1654         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1655                 if (time_before(jiffies, osd->lru_ttl))
1656                         break;
1657
1658                 remove_osd(osdc, osd);
1659         }
1660
1661         mutex_unlock(&osdc->request_mutex);
1662         up_read(&osdc->map_sem);
1663         schedule_delayed_work(&osdc->osds_timeout_work,
1664                               round_jiffies_relative(delay));
1665 }
1666
1667 static int ceph_oloc_decode(void **p, void *end,
1668                             struct ceph_object_locator *oloc)
1669 {
1670         u8 struct_v, struct_cv;
1671         u32 len;
1672         void *struct_end;
1673         int ret = 0;
1674
1675         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1676         struct_v = ceph_decode_8(p);
1677         struct_cv = ceph_decode_8(p);
1678         if (struct_v < 3) {
1679                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1680                         struct_v, struct_cv);
1681                 goto e_inval;
1682         }
1683         if (struct_cv > 6) {
1684                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1685                         struct_v, struct_cv);
1686                 goto e_inval;
1687         }
1688         len = ceph_decode_32(p);
1689         ceph_decode_need(p, end, len, e_inval);
1690         struct_end = *p + len;
1691
1692         oloc->pool = ceph_decode_64(p);
1693         *p += 4; /* skip preferred */
1694
1695         len = ceph_decode_32(p);
1696         if (len > 0) {
1697                 pr_warn("ceph_object_locator::key is set\n");
1698                 goto e_inval;
1699         }
1700
1701         if (struct_v >= 5) {
1702                 len = ceph_decode_32(p);
1703                 if (len > 0) {
1704                         pr_warn("ceph_object_locator::nspace is set\n");
1705                         goto e_inval;
1706                 }
1707         }
1708
1709         if (struct_v >= 6) {
1710                 s64 hash = ceph_decode_64(p);
1711                 if (hash != -1) {
1712                         pr_warn("ceph_object_locator::hash is set\n");
1713                         goto e_inval;
1714                 }
1715         }
1716
1717         /* skip the rest */
1718         *p = struct_end;
1719 out:
1720         return ret;
1721
1722 e_inval:
1723         ret = -EINVAL;
1724         goto out;
1725 }
1726
1727 static int ceph_redirect_decode(void **p, void *end,
1728                                 struct ceph_request_redirect *redir)
1729 {
1730         u8 struct_v, struct_cv;
1731         u32 len;
1732         void *struct_end;
1733         int ret;
1734
1735         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1736         struct_v = ceph_decode_8(p);
1737         struct_cv = ceph_decode_8(p);
1738         if (struct_cv > 1) {
1739                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1740                         struct_v, struct_cv);
1741                 goto e_inval;
1742         }
1743         len = ceph_decode_32(p);
1744         ceph_decode_need(p, end, len, e_inval);
1745         struct_end = *p + len;
1746
1747         ret = ceph_oloc_decode(p, end, &redir->oloc);
1748         if (ret)
1749                 goto out;
1750
1751         len = ceph_decode_32(p);
1752         if (len > 0) {
1753                 pr_warn("ceph_request_redirect::object_name is set\n");
1754                 goto e_inval;
1755         }
1756
1757         len = ceph_decode_32(p);
1758         *p += len; /* skip osd_instructions */
1759
1760         /* skip the rest */
1761         *p = struct_end;
1762 out:
1763         return ret;
1764
1765 e_inval:
1766         ret = -EINVAL;
1767         goto out;
1768 }
1769
1770 static void complete_request(struct ceph_osd_request *req)
1771 {
1772         complete_all(&req->r_safe_completion);  /* fsync waiter */
1773 }
1774
1775 /*
1776  * handle osd op reply.  either call the callback if it is specified,
1777  * or do the completion to wake up the waiting thread.
1778  */
1779 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1780 {
1781         void *p, *end;
1782         struct ceph_osd_request *req;
1783         struct ceph_request_redirect redir;
1784         u64 tid;
1785         int object_len;
1786         unsigned int numops;
1787         int payload_len, flags;
1788         s32 result;
1789         s32 retry_attempt;
1790         struct ceph_pg pg;
1791         int err;
1792         u32 reassert_epoch;
1793         u64 reassert_version;
1794         u32 osdmap_epoch;
1795         int already_completed;
1796         u32 bytes;
1797         u8 decode_redir;
1798         unsigned int i;
1799
1800         tid = le64_to_cpu(msg->hdr.tid);
1801         dout("handle_reply %p tid %llu\n", msg, tid);
1802
1803         p = msg->front.iov_base;
1804         end = p + msg->front.iov_len;
1805
1806         ceph_decode_need(&p, end, 4, bad);
1807         object_len = ceph_decode_32(&p);
1808         ceph_decode_need(&p, end, object_len, bad);
1809         p += object_len;
1810
1811         err = ceph_decode_pgid(&p, end, &pg);
1812         if (err)
1813                 goto bad;
1814
1815         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1816         flags = ceph_decode_64(&p);
1817         result = ceph_decode_32(&p);
1818         reassert_epoch = ceph_decode_32(&p);
1819         reassert_version = ceph_decode_64(&p);
1820         osdmap_epoch = ceph_decode_32(&p);
1821
1822         /* lookup */
1823         down_read(&osdc->map_sem);
1824         mutex_lock(&osdc->request_mutex);
1825         req = __lookup_request(osdc, tid);
1826         if (req == NULL) {
1827                 dout("handle_reply tid %llu dne\n", tid);
1828                 goto bad_mutex;
1829         }
1830         ceph_osdc_get_request(req);
1831
1832         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1833              req, result);
1834
1835         ceph_decode_need(&p, end, 4, bad_put);
1836         numops = ceph_decode_32(&p);
1837         if (numops > CEPH_OSD_MAX_OPS)
1838                 goto bad_put;
1839         if (numops != req->r_num_ops)
1840                 goto bad_put;
1841         payload_len = 0;
1842         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1843         for (i = 0; i < numops; i++) {
1844                 struct ceph_osd_op *op = p;
1845                 int len;
1846
1847                 len = le32_to_cpu(op->payload_len);
1848                 req->r_ops[i].outdata_len = len;
1849                 dout(" op %d has %d bytes\n", i, len);
1850                 payload_len += len;
1851                 p += sizeof(*op);
1852         }
1853         bytes = le32_to_cpu(msg->hdr.data_len);
1854         if (payload_len != bytes) {
1855                 pr_warn("sum of op payload lens %d != data_len %d\n",
1856                         payload_len, bytes);
1857                 goto bad_put;
1858         }
1859
1860         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1861         retry_attempt = ceph_decode_32(&p);
1862         for (i = 0; i < numops; i++)
1863                 req->r_ops[i].rval = ceph_decode_32(&p);
1864
1865         if (le16_to_cpu(msg->hdr.version) >= 6) {
1866                 p += 8 + 4; /* skip replay_version */
1867                 p += 8; /* skip user_version */
1868
1869                 if (le16_to_cpu(msg->hdr.version) >= 7)
1870                         ceph_decode_8_safe(&p, end, decode_redir, bad_put);
1871                 else
1872                         decode_redir = 1;
1873         } else {
1874                 decode_redir = 0;
1875         }
1876
1877         if (decode_redir) {
1878                 err = ceph_redirect_decode(&p, end, &redir);
1879                 if (err)
1880                         goto bad_put;
1881         } else {
1882                 redir.oloc.pool = -1;
1883         }
1884
1885         if (redir.oloc.pool != -1) {
1886                 dout("redirect pool %lld\n", redir.oloc.pool);
1887
1888                 __unregister_request(osdc, req);
1889
1890                 req->r_target_oloc = redir.oloc; /* struct */
1891
1892                 /*
1893                  * Start redirect requests with nofail=true.  If
1894                  * mapping fails, request will end up on the notarget
1895                  * list, waiting for the new osdmap (which can take
1896                  * a while), even though the original request mapped
1897                  * successfully.  In the future we might want to follow
1898                  * original request's nofail setting here.
1899                  */
1900                 err = __ceph_osdc_start_request(osdc, req, true);
1901                 BUG_ON(err);
1902
1903                 goto out_unlock;
1904         }
1905
1906         already_completed = req->r_got_reply;
1907         if (!req->r_got_reply) {
1908                 req->r_result = result;
1909                 dout("handle_reply result %d bytes %d\n", req->r_result,
1910                      bytes);
1911                 if (req->r_result == 0)
1912                         req->r_result = bytes;
1913
1914                 /* in case this is a write and we need to replay, */
1915                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1916                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1917
1918                 req->r_got_reply = 1;
1919         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1920                 dout("handle_reply tid %llu dup ack\n", tid);
1921                 goto out_unlock;
1922         }
1923
1924         dout("handle_reply tid %llu flags %d\n", tid, flags);
1925
1926         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1927                 __register_linger_request(osdc, req);
1928
1929         /* either this is a read, or we got the safe response */
1930         if (result < 0 ||
1931             (flags & CEPH_OSD_FLAG_ONDISK) ||
1932             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1933                 __unregister_request(osdc, req);
1934
1935         mutex_unlock(&osdc->request_mutex);
1936         up_read(&osdc->map_sem);
1937
1938         if (!already_completed) {
1939                 if (req->r_unsafe_callback &&
1940                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1941                         req->r_unsafe_callback(req, true);
1942                 if (req->r_callback)
1943                         req->r_callback(req, msg);
1944                 else
1945                         complete_all(&req->r_completion);
1946         }
1947
1948         if (flags & CEPH_OSD_FLAG_ONDISK) {
1949                 if (req->r_unsafe_callback && already_completed)
1950                         req->r_unsafe_callback(req, false);
1951                 complete_request(req);
1952         }
1953
1954 out:
1955         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1956         ceph_osdc_put_request(req);
1957         return;
1958 out_unlock:
1959         mutex_unlock(&osdc->request_mutex);
1960         up_read(&osdc->map_sem);
1961         goto out;
1962
1963 bad_put:
1964         req->r_result = -EIO;
1965         __unregister_request(osdc, req);
1966         if (req->r_callback)
1967                 req->r_callback(req, msg);
1968         else
1969                 complete_all(&req->r_completion);
1970         complete_request(req);
1971         ceph_osdc_put_request(req);
1972 bad_mutex:
1973         mutex_unlock(&osdc->request_mutex);
1974         up_read(&osdc->map_sem);
1975 bad:
1976         pr_err("corrupt osd_op_reply got %d %d\n",
1977                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1978         ceph_msg_dump(msg);
1979 }
1980
1981 static void reset_changed_osds(struct ceph_osd_client *osdc)
1982 {
1983         struct rb_node *p, *n;
1984
1985         dout("%s %p\n", __func__, osdc);
1986         for (p = rb_first(&osdc->osds); p; p = n) {
1987                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1988
1989                 n = rb_next(p);
1990                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1991                     memcmp(&osd->o_con.peer_addr,
1992                            ceph_osd_addr(osdc->osdmap,
1993                                          osd->o_osd),
1994                            sizeof(struct ceph_entity_addr)) != 0)
1995                         __reset_osd(osdc, osd);
1996         }
1997 }
1998
1999 /*
2000  * Requeue requests whose mapping to an OSD has changed.  If requests map to
2001  * no osd, request a new map.
2002  *
2003  * Caller should hold map_sem for read.
2004  */
2005 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
2006                           bool force_resend_writes)
2007 {
2008         struct ceph_osd_request *req, *nreq;
2009         struct rb_node *p;
2010         int needmap = 0;
2011         int err;
2012         bool force_resend_req;
2013
2014         dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
2015                 force_resend_writes ? " (force resend writes)" : "");
2016         mutex_lock(&osdc->request_mutex);
2017         for (p = rb_first(&osdc->requests); p; ) {
2018                 req = rb_entry(p, struct ceph_osd_request, r_node);
2019                 p = rb_next(p);
2020
2021                 /*
2022                  * For linger requests that have not yet been
2023                  * registered, move them to the linger list; they'll
2024                  * be sent to the osd in the loop below.  Unregister
2025                  * the request before re-registering it as a linger
2026                  * request to ensure the __map_request() below
2027                  * will decide it needs to be sent.
2028                  */
2029                 if (req->r_linger && list_empty(&req->r_linger_item)) {
2030                         dout("%p tid %llu restart on osd%d\n",
2031                              req, req->r_tid,
2032                              req->r_osd ? req->r_osd->o_osd : -1);
2033                         ceph_osdc_get_request(req);
2034                         __unregister_request(osdc, req);
2035                         __register_linger_request(osdc, req);
2036                         ceph_osdc_put_request(req);
2037                         continue;
2038                 }
2039
2040                 force_resend_req = force_resend ||
2041                         (force_resend_writes &&
2042                                 req->r_flags & CEPH_OSD_FLAG_WRITE);
2043                 err = __map_request(osdc, req, force_resend_req);
2044                 if (err < 0)
2045                         continue;  /* error */
2046                 if (req->r_osd == NULL) {
2047                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2048                         needmap++;  /* request a newer map */
2049                 } else if (err > 0) {
2050                         if (!req->r_linger) {
2051                                 dout("%p tid %llu requeued on osd%d\n", req,
2052                                      req->r_tid,
2053                                      req->r_osd ? req->r_osd->o_osd : -1);
2054                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2055                         }
2056                 }
2057         }
2058
2059         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2060                                  r_linger_item) {
2061                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2062
2063                 err = __map_request(osdc, req,
2064                                     force_resend || force_resend_writes);
2065                 dout("__map_request returned %d\n", err);
2066                 if (err < 0)
2067                         continue;  /* hrm! */
2068                 if (req->r_osd == NULL || err > 0) {
2069                         if (req->r_osd == NULL) {
2070                                 dout("lingering %p tid %llu maps to no osd\n",
2071                                      req, req->r_tid);
2072                                 /*
2073                                  * A homeless lingering request makes
2074                                  * no sense, as it's job is to keep
2075                                  * a particular OSD connection open.
2076                                  * Request a newer map and kick the
2077                                  * request, knowing that it won't be
2078                                  * resent until we actually get a map
2079                                  * that can tell us where to send it.
2080                                  */
2081                                 needmap++;
2082                         }
2083
2084                         dout("kicking lingering %p tid %llu osd%d\n", req,
2085                              req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2086                         __register_request(osdc, req);
2087                         __unregister_linger_request(osdc, req);
2088                 }
2089         }
2090         reset_changed_osds(osdc);
2091         mutex_unlock(&osdc->request_mutex);
2092
2093         if (needmap) {
2094                 dout("%d requests for down osds, need new map\n", needmap);
2095                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2096         }
2097 }
2098
2099
2100 /*
2101  * Process updated osd map.
2102  *
2103  * The message contains any number of incremental and full maps, normally
2104  * indicating some sort of topology change in the cluster.  Kick requests
2105  * off to different OSDs as needed.
2106  */
2107 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2108 {
2109         void *p, *end, *next;
2110         u32 nr_maps, maplen;
2111         u32 epoch;
2112         struct ceph_osdmap *newmap = NULL, *oldmap;
2113         int err;
2114         struct ceph_fsid fsid;
2115         bool was_full;
2116
2117         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2118         p = msg->front.iov_base;
2119         end = p + msg->front.iov_len;
2120
2121         /* verify fsid */
2122         ceph_decode_need(&p, end, sizeof(fsid), bad);
2123         ceph_decode_copy(&p, &fsid, sizeof(fsid));
2124         if (ceph_check_fsid(osdc->client, &fsid) < 0)
2125                 return;
2126
2127         down_write(&osdc->map_sem);
2128
2129         was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2130
2131         /* incremental maps */
2132         ceph_decode_32_safe(&p, end, nr_maps, bad);
2133         dout(" %d inc maps\n", nr_maps);
2134         while (nr_maps > 0) {
2135                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2136                 epoch = ceph_decode_32(&p);
2137                 maplen = ceph_decode_32(&p);
2138                 ceph_decode_need(&p, end, maplen, bad);
2139                 next = p + maplen;
2140                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2141                         dout("applying incremental map %u len %d\n",
2142                              epoch, maplen);
2143                         newmap = osdmap_apply_incremental(&p, next,
2144                                                           osdc->osdmap);
2145                         if (IS_ERR(newmap)) {
2146                                 err = PTR_ERR(newmap);
2147                                 goto bad;
2148                         }
2149                         BUG_ON(!newmap);
2150                         if (newmap != osdc->osdmap) {
2151                                 ceph_osdmap_destroy(osdc->osdmap);
2152                                 osdc->osdmap = newmap;
2153                         }
2154                         was_full = was_full ||
2155                                 ceph_osdmap_flag(osdc->osdmap,
2156                                                  CEPH_OSDMAP_FULL);
2157                         kick_requests(osdc, 0, was_full);
2158                 } else {
2159                         dout("ignoring incremental map %u len %d\n",
2160                              epoch, maplen);
2161                 }
2162                 p = next;
2163                 nr_maps--;
2164         }
2165         if (newmap)
2166                 goto done;
2167
2168         /* full maps */
2169         ceph_decode_32_safe(&p, end, nr_maps, bad);
2170         dout(" %d full maps\n", nr_maps);
2171         while (nr_maps) {
2172                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2173                 epoch = ceph_decode_32(&p);
2174                 maplen = ceph_decode_32(&p);
2175                 ceph_decode_need(&p, end, maplen, bad);
2176                 if (nr_maps > 1) {
2177                         dout("skipping non-latest full map %u len %d\n",
2178                              epoch, maplen);
2179                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2180                         dout("skipping full map %u len %d, "
2181                              "older than our %u\n", epoch, maplen,
2182                              osdc->osdmap->epoch);
2183                 } else {
2184                         int skipped_map = 0;
2185
2186                         dout("taking full map %u len %d\n", epoch, maplen);
2187                         newmap = ceph_osdmap_decode(&p, p+maplen);
2188                         if (IS_ERR(newmap)) {
2189                                 err = PTR_ERR(newmap);
2190                                 goto bad;
2191                         }
2192                         BUG_ON(!newmap);
2193                         oldmap = osdc->osdmap;
2194                         osdc->osdmap = newmap;
2195                         if (oldmap) {
2196                                 if (oldmap->epoch + 1 < newmap->epoch)
2197                                         skipped_map = 1;
2198                                 ceph_osdmap_destroy(oldmap);
2199                         }
2200                         was_full = was_full ||
2201                                 ceph_osdmap_flag(osdc->osdmap,
2202                                                  CEPH_OSDMAP_FULL);
2203                         kick_requests(osdc, skipped_map, was_full);
2204                 }
2205                 p += maplen;
2206                 nr_maps--;
2207         }
2208
2209         if (!osdc->osdmap)
2210                 goto bad;
2211 done:
2212         downgrade_write(&osdc->map_sem);
2213         ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2214                           osdc->osdmap->epoch);
2215
2216         /*
2217          * subscribe to subsequent osdmap updates if full to ensure
2218          * we find out when we are no longer full and stop returning
2219          * ENOSPC.
2220          */
2221         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2222                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2223                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2224                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2225
2226         mutex_lock(&osdc->request_mutex);
2227         __send_queued(osdc);
2228         mutex_unlock(&osdc->request_mutex);
2229         up_read(&osdc->map_sem);
2230         wake_up_all(&osdc->client->auth_wq);
2231         return;
2232
2233 bad:
2234         pr_err("osdc handle_map corrupt msg\n");
2235         ceph_msg_dump(msg);
2236         up_write(&osdc->map_sem);
2237 }
2238
2239 /*
2240  * watch/notify callback event infrastructure
2241  *
2242  * These callbacks are used both for watch and notify operations.
2243  */
2244 static void __release_event(struct kref *kref)
2245 {
2246         struct ceph_osd_event *event =
2247                 container_of(kref, struct ceph_osd_event, kref);
2248
2249         dout("__release_event %p\n", event);
2250         kfree(event);
2251 }
2252
2253 static void get_event(struct ceph_osd_event *event)
2254 {
2255         kref_get(&event->kref);
2256 }
2257
2258 void ceph_osdc_put_event(struct ceph_osd_event *event)
2259 {
2260         kref_put(&event->kref, __release_event);
2261 }
2262 EXPORT_SYMBOL(ceph_osdc_put_event);
2263
2264 static void __insert_event(struct ceph_osd_client *osdc,
2265                              struct ceph_osd_event *new)
2266 {
2267         struct rb_node **p = &osdc->event_tree.rb_node;
2268         struct rb_node *parent = NULL;
2269         struct ceph_osd_event *event = NULL;
2270
2271         while (*p) {
2272                 parent = *p;
2273                 event = rb_entry(parent, struct ceph_osd_event, node);
2274                 if (new->cookie < event->cookie)
2275                         p = &(*p)->rb_left;
2276                 else if (new->cookie > event->cookie)
2277                         p = &(*p)->rb_right;
2278                 else
2279                         BUG();
2280         }
2281
2282         rb_link_node(&new->node, parent, p);
2283         rb_insert_color(&new->node, &osdc->event_tree);
2284 }
2285
2286 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2287                                                 u64 cookie)
2288 {
2289         struct rb_node **p = &osdc->event_tree.rb_node;
2290         struct rb_node *parent = NULL;
2291         struct ceph_osd_event *event = NULL;
2292
2293         while (*p) {
2294                 parent = *p;
2295                 event = rb_entry(parent, struct ceph_osd_event, node);
2296                 if (cookie < event->cookie)
2297                         p = &(*p)->rb_left;
2298                 else if (cookie > event->cookie)
2299                         p = &(*p)->rb_right;
2300                 else
2301                         return event;
2302         }
2303         return NULL;
2304 }
2305
2306 static void __remove_event(struct ceph_osd_event *event)
2307 {
2308         struct ceph_osd_client *osdc = event->osdc;
2309
2310         if (!RB_EMPTY_NODE(&event->node)) {
2311                 dout("__remove_event removed %p\n", event);
2312                 rb_erase(&event->node, &osdc->event_tree);
2313                 ceph_osdc_put_event(event);
2314         } else {
2315                 dout("__remove_event didn't remove %p\n", event);
2316         }
2317 }
2318
2319 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2320                            void (*event_cb)(u64, u64, u8, void *),
2321                            void *data, struct ceph_osd_event **pevent)
2322 {
2323         struct ceph_osd_event *event;
2324
2325         event = kmalloc(sizeof(*event), GFP_NOIO);
2326         if (!event)
2327                 return -ENOMEM;
2328
2329         dout("create_event %p\n", event);
2330         event->cb = event_cb;
2331         event->one_shot = 0;
2332         event->data = data;
2333         event->osdc = osdc;
2334         INIT_LIST_HEAD(&event->osd_node);
2335         RB_CLEAR_NODE(&event->node);
2336         kref_init(&event->kref);   /* one ref for us */
2337         kref_get(&event->kref);    /* one ref for the caller */
2338
2339         spin_lock(&osdc->event_lock);
2340         event->cookie = ++osdc->event_count;
2341         __insert_event(osdc, event);
2342         spin_unlock(&osdc->event_lock);
2343
2344         *pevent = event;
2345         return 0;
2346 }
2347 EXPORT_SYMBOL(ceph_osdc_create_event);
2348
2349 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2350 {
2351         struct ceph_osd_client *osdc = event->osdc;
2352
2353         dout("cancel_event %p\n", event);
2354         spin_lock(&osdc->event_lock);
2355         __remove_event(event);
2356         spin_unlock(&osdc->event_lock);
2357         ceph_osdc_put_event(event); /* caller's */
2358 }
2359 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2360
2361
2362 static void do_event_work(struct work_struct *work)
2363 {
2364         struct ceph_osd_event_work *event_work =
2365                 container_of(work, struct ceph_osd_event_work, work);
2366         struct ceph_osd_event *event = event_work->event;
2367         u64 ver = event_work->ver;
2368         u64 notify_id = event_work->notify_id;
2369         u8 opcode = event_work->opcode;
2370
2371         dout("do_event_work completing %p\n", event);
2372         event->cb(ver, notify_id, opcode, event->data);
2373         dout("do_event_work completed %p\n", event);
2374         ceph_osdc_put_event(event);
2375         kfree(event_work);
2376 }
2377
2378
2379 /*
2380  * Process osd watch notifications
2381  */
2382 static void handle_watch_notify(struct ceph_osd_client *osdc,
2383                                 struct ceph_msg *msg)
2384 {
2385         void *p, *end;
2386         u8 proto_ver;
2387         u64 cookie, ver, notify_id;
2388         u8 opcode;
2389         struct ceph_osd_event *event;
2390         struct ceph_osd_event_work *event_work;
2391
2392         p = msg->front.iov_base;
2393         end = p + msg->front.iov_len;
2394
2395         ceph_decode_8_safe(&p, end, proto_ver, bad);
2396         ceph_decode_8_safe(&p, end, opcode, bad);
2397         ceph_decode_64_safe(&p, end, cookie, bad);
2398         ceph_decode_64_safe(&p, end, ver, bad);
2399         ceph_decode_64_safe(&p, end, notify_id, bad);
2400
2401         spin_lock(&osdc->event_lock);
2402         event = __find_event(osdc, cookie);
2403         if (event) {
2404                 BUG_ON(event->one_shot);
2405                 get_event(event);
2406         }
2407         spin_unlock(&osdc->event_lock);
2408         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2409              cookie, ver, event);
2410         if (event) {
2411                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2412                 if (!event_work) {
2413                         pr_err("couldn't allocate event_work\n");
2414                         ceph_osdc_put_event(event);
2415                         return;
2416                 }
2417                 INIT_WORK(&event_work->work, do_event_work);
2418                 event_work->event = event;
2419                 event_work->ver = ver;
2420                 event_work->notify_id = notify_id;
2421                 event_work->opcode = opcode;
2422
2423                 queue_work(osdc->notify_wq, &event_work->work);
2424         }
2425
2426         return;
2427
2428 bad:
2429         pr_err("osdc handle_watch_notify corrupt msg\n");
2430 }
2431
2432 /*
2433  * build new request AND message
2434  *
2435  */
2436 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2437                                 struct ceph_snap_context *snapc, u64 snap_id,
2438                                 struct timespec *mtime)
2439 {
2440         struct ceph_msg *msg = req->r_request;
2441         void *p;
2442         size_t msg_size;
2443         int flags = req->r_flags;
2444         u64 data_len;
2445         unsigned int i;
2446
2447         req->r_snapid = snap_id;
2448         WARN_ON(snapc != req->r_snapc);
2449
2450         /* encode request */
2451         msg->hdr.version = cpu_to_le16(4);
2452
2453         p = msg->front.iov_base;
2454         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2455         req->r_request_osdmap_epoch = p;
2456         p += 4;
2457         req->r_request_flags = p;
2458         p += 4;
2459         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2460                 ceph_encode_timespec(p, mtime);
2461         p += sizeof(struct ceph_timespec);
2462         req->r_request_reassert_version = p;
2463         p += sizeof(struct ceph_eversion); /* will get filled in */
2464
2465         /* oloc */
2466         ceph_encode_8(&p, 4);
2467         ceph_encode_8(&p, 4);
2468         ceph_encode_32(&p, 8 + 4 + 4);
2469         req->r_request_pool = p;
2470         p += 8;
2471         ceph_encode_32(&p, -1);  /* preferred */
2472         ceph_encode_32(&p, 0);   /* key len */
2473
2474         ceph_encode_8(&p, 1);
2475         req->r_request_pgid = p;
2476         p += 8 + 4;
2477         ceph_encode_32(&p, -1);  /* preferred */
2478
2479         /* oid */
2480         ceph_encode_32(&p, req->r_base_oid.name_len);
2481         memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2482         dout("oid %*pE len %d\n", req->r_base_oid.name_len,
2483              req->r_base_oid.name, req->r_base_oid.name_len);
2484         p += req->r_base_oid.name_len;
2485
2486         /* ops--can imply data */
2487         ceph_encode_16(&p, (u16)req->r_num_ops);
2488         data_len = 0;
2489         for (i = 0; i < req->r_num_ops; i++) {
2490                 data_len += osd_req_encode_op(req, p, i);
2491                 p += sizeof(struct ceph_osd_op);
2492         }
2493
2494         /* snaps */
2495         ceph_encode_64(&p, req->r_snapid);
2496         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2497         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2498         if (req->r_snapc) {
2499                 for (i = 0; i < req->r_snapc->num_snaps; i++) {
2500                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2501                 }
2502         }
2503
2504         req->r_request_attempts = p;
2505         p += 4;
2506
2507         /* data */
2508         if (flags & CEPH_OSD_FLAG_WRITE) {
2509                 u16 data_off;
2510
2511                 /*
2512                  * The header "data_off" is a hint to the receiver
2513                  * allowing it to align received data into its
2514                  * buffers such that there's no need to re-copy
2515                  * it before writing it to disk (direct I/O).
2516                  */
2517                 data_off = (u16) (off & 0xffff);
2518                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2519         }
2520         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2521
2522         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2523         msg_size = p - msg->front.iov_base;
2524         msg->front.iov_len = msg_size;
2525         msg->hdr.front_len = cpu_to_le32(msg_size);
2526
2527         dout("build_request msg_size was %d\n", (int)msg_size);
2528 }
2529 EXPORT_SYMBOL(ceph_osdc_build_request);
2530
2531 /*
2532  * Register request, send initial attempt.
2533  */
2534 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2535                             struct ceph_osd_request *req,
2536                             bool nofail)
2537 {
2538         int rc;
2539
2540         down_read(&osdc->map_sem);
2541         mutex_lock(&osdc->request_mutex);
2542
2543         rc = __ceph_osdc_start_request(osdc, req, nofail);
2544
2545         mutex_unlock(&osdc->request_mutex);
2546         up_read(&osdc->map_sem);
2547
2548         return rc;
2549 }
2550 EXPORT_SYMBOL(ceph_osdc_start_request);
2551
2552 /*
2553  * Unregister a registered request.  The request is not completed (i.e.
2554  * no callbacks or wakeups) - higher layers are supposed to know what
2555  * they are canceling.
2556  */
2557 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2558 {
2559         struct ceph_osd_client *osdc = req->r_osdc;
2560
2561         mutex_lock(&osdc->request_mutex);
2562         if (req->r_linger)
2563                 __unregister_linger_request(osdc, req);
2564         __unregister_request(osdc, req);
2565         mutex_unlock(&osdc->request_mutex);
2566
2567         dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2568 }
2569 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2570
2571 /*
2572  * wait for a request to complete
2573  */
2574 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2575                            struct ceph_osd_request *req)
2576 {
2577         int rc;
2578
2579         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2580
2581         rc = wait_for_completion_interruptible(&req->r_completion);
2582         if (rc < 0) {
2583                 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2584                 ceph_osdc_cancel_request(req);
2585                 complete_request(req);
2586                 return rc;
2587         }
2588
2589         dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2590              req->r_result);
2591         return req->r_result;
2592 }
2593 EXPORT_SYMBOL(ceph_osdc_wait_request);
2594
2595 /*
2596  * sync - wait for all in-flight requests to flush.  avoid starvation.
2597  */
2598 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2599 {
2600         struct ceph_osd_request *req;
2601         u64 last_tid, next_tid = 0;
2602
2603         mutex_lock(&osdc->request_mutex);
2604         last_tid = osdc->last_tid;
2605         while (1) {
2606                 req = __lookup_request_ge(osdc, next_tid);
2607                 if (!req)
2608                         break;
2609                 if (req->r_tid > last_tid)
2610                         break;
2611
2612                 next_tid = req->r_tid + 1;
2613                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2614                         continue;
2615
2616                 ceph_osdc_get_request(req);
2617                 mutex_unlock(&osdc->request_mutex);
2618                 dout("sync waiting on tid %llu (last is %llu)\n",
2619                      req->r_tid, last_tid);
2620                 wait_for_completion(&req->r_safe_completion);
2621                 mutex_lock(&osdc->request_mutex);
2622                 ceph_osdc_put_request(req);
2623         }
2624         mutex_unlock(&osdc->request_mutex);
2625         dout("sync done (thru tid %llu)\n", last_tid);
2626 }
2627 EXPORT_SYMBOL(ceph_osdc_sync);
2628
2629 /*
2630  * Call all pending notify callbacks - for use after a watch is
2631  * unregistered, to make sure no more callbacks for it will be invoked
2632  */
2633 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2634 {
2635         flush_workqueue(osdc->notify_wq);
2636 }
2637 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2638
2639
2640 /*
2641  * init, shutdown
2642  */
2643 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2644 {
2645         int err;
2646
2647         dout("init\n");
2648         osdc->client = client;
2649         osdc->osdmap = NULL;
2650         init_rwsem(&osdc->map_sem);
2651         mutex_init(&osdc->request_mutex);
2652         osdc->last_tid = 0;
2653         osdc->osds = RB_ROOT;
2654         INIT_LIST_HEAD(&osdc->osd_lru);
2655         osdc->requests = RB_ROOT;
2656         INIT_LIST_HEAD(&osdc->req_lru);
2657         INIT_LIST_HEAD(&osdc->req_unsent);
2658         INIT_LIST_HEAD(&osdc->req_notarget);
2659         INIT_LIST_HEAD(&osdc->req_linger);
2660         osdc->num_requests = 0;
2661         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2662         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2663         spin_lock_init(&osdc->event_lock);
2664         osdc->event_tree = RB_ROOT;
2665         osdc->event_count = 0;
2666
2667         schedule_delayed_work(&osdc->osds_timeout_work,
2668             round_jiffies_relative(osdc->client->options->osd_idle_ttl));
2669
2670         err = -ENOMEM;
2671         osdc->req_mempool = mempool_create_slab_pool(10,
2672                                                      ceph_osd_request_cache);
2673         if (!osdc->req_mempool)
2674                 goto out;
2675
2676         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2677                                 PAGE_SIZE, 10, true, "osd_op");
2678         if (err < 0)
2679                 goto out_mempool;
2680         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2681                                 PAGE_SIZE, 10, true, "osd_op_reply");
2682         if (err < 0)
2683                 goto out_msgpool;
2684
2685         err = -ENOMEM;
2686         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2687         if (!osdc->notify_wq)
2688                 goto out_msgpool_reply;
2689
2690         return 0;
2691
2692 out_msgpool_reply:
2693         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2694 out_msgpool:
2695         ceph_msgpool_destroy(&osdc->msgpool_op);
2696 out_mempool:
2697         mempool_destroy(osdc->req_mempool);
2698 out:
2699         return err;
2700 }
2701
2702 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2703 {
2704         flush_workqueue(osdc->notify_wq);
2705         destroy_workqueue(osdc->notify_wq);
2706         cancel_delayed_work_sync(&osdc->timeout_work);
2707         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2708
2709         mutex_lock(&osdc->request_mutex);
2710         while (!RB_EMPTY_ROOT(&osdc->osds)) {
2711                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
2712                                                 struct ceph_osd, o_node);
2713                 remove_osd(osdc, osd);
2714         }
2715         mutex_unlock(&osdc->request_mutex);
2716
2717         if (osdc->osdmap) {
2718                 ceph_osdmap_destroy(osdc->osdmap);
2719                 osdc->osdmap = NULL;
2720         }
2721         mempool_destroy(osdc->req_mempool);
2722         ceph_msgpool_destroy(&osdc->msgpool_op);
2723         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2724 }
2725
2726 /*
2727  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2728  * *plen.  Return number of bytes read, or error.
2729  */
2730 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2731                         struct ceph_vino vino, struct ceph_file_layout *layout,
2732                         u64 off, u64 *plen,
2733                         u32 truncate_seq, u64 truncate_size,
2734                         struct page **pages, int num_pages, int page_align)
2735 {
2736         struct ceph_osd_request *req;
2737         int rc = 0;
2738
2739         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2740              vino.snap, off, *plen);
2741         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2742                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2743                                     NULL, truncate_seq, truncate_size,
2744                                     false);
2745         if (IS_ERR(req))
2746                 return PTR_ERR(req);
2747
2748         /* it may be a short read due to an object boundary */
2749
2750         osd_req_op_extent_osd_data_pages(req, 0,
2751                                 pages, *plen, page_align, false, false);
2752
2753         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2754              off, *plen, *plen, page_align);
2755
2756         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2757
2758         rc = ceph_osdc_start_request(osdc, req, false);
2759         if (!rc)
2760                 rc = ceph_osdc_wait_request(osdc, req);
2761
2762         ceph_osdc_put_request(req);
2763         dout("readpages result %d\n", rc);
2764         return rc;
2765 }
2766 EXPORT_SYMBOL(ceph_osdc_readpages);
2767
2768 /*
2769  * do a synchronous write on N pages
2770  */
2771 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2772                          struct ceph_file_layout *layout,
2773                          struct ceph_snap_context *snapc,
2774                          u64 off, u64 len,
2775                          u32 truncate_seq, u64 truncate_size,
2776                          struct timespec *mtime,
2777                          struct page **pages, int num_pages)
2778 {
2779         struct ceph_osd_request *req;
2780         int rc = 0;
2781         int page_align = off & ~PAGE_MASK;
2782
2783         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2784         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2785                                     CEPH_OSD_OP_WRITE,
2786                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2787                                     snapc, truncate_seq, truncate_size,
2788                                     true);
2789         if (IS_ERR(req))
2790                 return PTR_ERR(req);
2791
2792         /* it may be a short write due to an object boundary */
2793         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2794                                 false, false);
2795         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2796
2797         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2798
2799         rc = ceph_osdc_start_request(osdc, req, true);
2800         if (!rc)
2801                 rc = ceph_osdc_wait_request(osdc, req);
2802
2803         ceph_osdc_put_request(req);
2804         if (rc == 0)
2805                 rc = len;
2806         dout("writepages result %d\n", rc);
2807         return rc;
2808 }
2809 EXPORT_SYMBOL(ceph_osdc_writepages);
2810
2811 int ceph_osdc_setup(void)
2812 {
2813         size_t size = sizeof(struct ceph_osd_request) +
2814             CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
2815
2816         BUG_ON(ceph_osd_request_cache);
2817         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
2818                                                    0, 0, NULL);
2819
2820         return ceph_osd_request_cache ? 0 : -ENOMEM;
2821 }
2822 EXPORT_SYMBOL(ceph_osdc_setup);
2823
2824 void ceph_osdc_cleanup(void)
2825 {
2826         BUG_ON(!ceph_osd_request_cache);
2827         kmem_cache_destroy(ceph_osd_request_cache);
2828         ceph_osd_request_cache = NULL;
2829 }
2830 EXPORT_SYMBOL(ceph_osdc_cleanup);
2831
2832 /*
2833  * handle incoming message
2834  */
2835 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2836 {
2837         struct ceph_osd *osd = con->private;
2838         struct ceph_osd_client *osdc;
2839         int type = le16_to_cpu(msg->hdr.type);
2840
2841         if (!osd)
2842                 goto out;
2843         osdc = osd->o_osdc;
2844
2845         switch (type) {
2846         case CEPH_MSG_OSD_MAP:
2847                 ceph_osdc_handle_map(osdc, msg);
2848                 break;
2849         case CEPH_MSG_OSD_OPREPLY:
2850                 handle_reply(osdc, msg);
2851                 break;
2852         case CEPH_MSG_WATCH_NOTIFY:
2853                 handle_watch_notify(osdc, msg);
2854                 break;
2855
2856         default:
2857                 pr_err("received unknown message type %d %s\n", type,
2858                        ceph_msg_type_name(type));
2859         }
2860 out:
2861         ceph_msg_put(msg);
2862 }
2863
2864 /*
2865  * Lookup and return message for incoming reply.  Don't try to do
2866  * anything about a larger than preallocated data portion of the
2867  * message at the moment - for now, just skip the message.
2868  */
2869 static struct ceph_msg *get_reply(struct ceph_connection *con,
2870                                   struct ceph_msg_header *hdr,
2871                                   int *skip)
2872 {
2873         struct ceph_osd *osd = con->private;
2874         struct ceph_osd_client *osdc = osd->o_osdc;
2875         struct ceph_msg *m;
2876         struct ceph_osd_request *req;
2877         int front_len = le32_to_cpu(hdr->front_len);
2878         int data_len = le32_to_cpu(hdr->data_len);
2879         u64 tid;
2880
2881         tid = le64_to_cpu(hdr->tid);
2882         mutex_lock(&osdc->request_mutex);
2883         req = __lookup_request(osdc, tid);
2884         if (!req) {
2885                 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
2886                      osd->o_osd, tid);
2887                 m = NULL;
2888                 *skip = 1;
2889                 goto out;
2890         }
2891
2892         ceph_msg_revoke_incoming(req->r_reply);
2893
2894         if (front_len > req->r_reply->front_alloc_len) {
2895                 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
2896                         __func__, osd->o_osd, req->r_tid, front_len,
2897                         req->r_reply->front_alloc_len);
2898                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2899                                  false);
2900                 if (!m)
2901                         goto out;
2902                 ceph_msg_put(req->r_reply);
2903                 req->r_reply = m;
2904         }
2905
2906         if (data_len > req->r_reply->data_length) {
2907                 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
2908                         __func__, osd->o_osd, req->r_tid, data_len,
2909                         req->r_reply->data_length);
2910                 m = NULL;
2911                 *skip = 1;
2912                 goto out;
2913         }
2914
2915         m = ceph_msg_get(req->r_reply);
2916         dout("get_reply tid %lld %p\n", tid, m);
2917
2918 out:
2919         mutex_unlock(&osdc->request_mutex);
2920         return m;
2921 }
2922
2923 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2924                                   struct ceph_msg_header *hdr,
2925                                   int *skip)
2926 {
2927         struct ceph_osd *osd = con->private;
2928         int type = le16_to_cpu(hdr->type);
2929         int front = le32_to_cpu(hdr->front_len);
2930
2931         *skip = 0;
2932         switch (type) {
2933         case CEPH_MSG_OSD_MAP:
2934         case CEPH_MSG_WATCH_NOTIFY:
2935                 return ceph_msg_new(type, front, GFP_NOFS, false);
2936         case CEPH_MSG_OSD_OPREPLY:
2937                 return get_reply(con, hdr, skip);
2938         default:
2939                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2940                         osd->o_osd);
2941                 *skip = 1;
2942                 return NULL;
2943         }
2944 }
2945
2946 /*
2947  * Wrappers to refcount containing ceph_osd struct
2948  */
2949 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2950 {
2951         struct ceph_osd *osd = con->private;
2952         if (get_osd(osd))
2953                 return con;
2954         return NULL;
2955 }
2956
2957 static void put_osd_con(struct ceph_connection *con)
2958 {
2959         struct ceph_osd *osd = con->private;
2960         put_osd(osd);
2961 }
2962
2963 /*
2964  * authentication
2965  */
2966 /*
2967  * Note: returned pointer is the address of a structure that's
2968  * managed separately.  Caller must *not* attempt to free it.
2969  */
2970 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2971                                         int *proto, int force_new)
2972 {
2973         struct ceph_osd *o = con->private;
2974         struct ceph_osd_client *osdc = o->o_osdc;
2975         struct ceph_auth_client *ac = osdc->client->monc.auth;
2976         struct ceph_auth_handshake *auth = &o->o_auth;
2977
2978         if (force_new && auth->authorizer) {
2979                 ceph_auth_destroy_authorizer(auth->authorizer);
2980                 auth->authorizer = NULL;
2981         }
2982         if (!auth->authorizer) {
2983                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2984                                                       auth);
2985                 if (ret)
2986                         return ERR_PTR(ret);
2987         } else {
2988                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2989                                                      auth);
2990                 if (ret)
2991                         return ERR_PTR(ret);
2992         }
2993         *proto = ac->protocol;
2994
2995         return auth;
2996 }
2997
2998
2999 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3000 {
3001         struct ceph_osd *o = con->private;
3002         struct ceph_osd_client *osdc = o->o_osdc;
3003         struct ceph_auth_client *ac = osdc->client->monc.auth;
3004
3005         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
3006 }
3007
3008 static int invalidate_authorizer(struct ceph_connection *con)
3009 {
3010         struct ceph_osd *o = con->private;
3011         struct ceph_osd_client *osdc = o->o_osdc;
3012         struct ceph_auth_client *ac = osdc->client->monc.auth;
3013
3014         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
3015         return ceph_monc_validate_auth(&osdc->client->monc);
3016 }
3017
3018 static int osd_sign_message(struct ceph_msg *msg)
3019 {
3020         struct ceph_osd *o = msg->con->private;
3021         struct ceph_auth_handshake *auth = &o->o_auth;
3022
3023         return ceph_auth_sign_message(auth, msg);
3024 }
3025
3026 static int osd_check_message_signature(struct ceph_msg *msg)
3027 {
3028         struct ceph_osd *o = msg->con->private;
3029         struct ceph_auth_handshake *auth = &o->o_auth;
3030
3031         return ceph_auth_check_message_signature(auth, msg);
3032 }
3033
3034 static const struct ceph_connection_operations osd_con_ops = {
3035         .get = get_osd_con,
3036         .put = put_osd_con,
3037         .dispatch = dispatch,
3038         .get_authorizer = get_authorizer,
3039         .verify_authorizer_reply = verify_authorizer_reply,
3040         .invalidate_authorizer = invalidate_authorizer,
3041         .alloc_msg = alloc_msg,
3042         .sign_message = osd_sign_message,
3043         .check_message_signature = osd_check_message_signature,
3044         .fault = osd_reset,
3045 };