1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/fs.h> 4 #include <linux/wait.h> 5 #include <linux/slab.h> 6 #include <linux/gfp.h> 7 #include <linux/sched.h> 8 #include <linux/debugfs.h> 9 #include <linux/seq_file.h> 10 #include <linux/utsname.h> 11 #include <linux/ratelimit.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 16 #include <linux/ceph/ceph_features.h> 17 #include <linux/ceph/messenger.h> 18 #include <linux/ceph/decode.h> 19 #include <linux/ceph/pagelist.h> 20 #include <linux/ceph/auth.h> 21 #include <linux/ceph/debugfs.h> 22 23 /* 24 * A cluster of MDS (metadata server) daemons is responsible for 25 * managing the file system namespace (the directory hierarchy and 26 * inodes) and for coordinating shared access to storage. Metadata is 27 * partitioning hierarchically across a number of servers, and that 28 * partition varies over time as the cluster adjusts the distribution 29 * in order to balance load. 30 * 31 * The MDS client is primarily responsible to managing synchronous 32 * metadata requests for operations like open, unlink, and so forth. 33 * If there is a MDS failure, we find out about it when we (possibly 34 * request and) receive a new MDS map, and can resubmit affected 35 * requests. 36 * 37 * For the most part, though, we take advantage of a lossless 38 * communications channel to the MDS, and do not need to worry about 39 * timing out or resubmitting requests. 40 * 41 * We maintain a stateful "session" with each MDS we interact with. 42 * Within each session, we sent periodic heartbeat messages to ensure 43 * any capabilities or leases we have been issues remain valid. If 44 * the session times out and goes stale, our leases and capabilities 45 * are no longer valid. 46 */ 47 48 struct ceph_reconnect_state { 49 int nr_caps; 50 struct ceph_pagelist *pagelist; 51 bool flock; 52 }; 53 54 static void __wake_requests(struct ceph_mds_client *mdsc, 55 struct list_head *head); 56 57 static const struct ceph_connection_operations mds_con_ops; 58 59 60 /* 61 * mds reply parsing 62 */ 63 64 /* 65 * parse individual inode info 66 */ 67 static int parse_reply_info_in(void **p, void *end, 68 struct ceph_mds_reply_info_in *info, 69 u64 features) 70 { 71 int err = -EIO; 72 73 info->in = *p; 74 *p += sizeof(struct ceph_mds_reply_inode) + 75 sizeof(*info->in->fragtree.splits) * 76 le32_to_cpu(info->in->fragtree.nsplits); 77 78 ceph_decode_32_safe(p, end, info->symlink_len, bad); 79 ceph_decode_need(p, end, info->symlink_len, bad); 80 info->symlink = *p; 81 *p += info->symlink_len; 82 83 if (features & CEPH_FEATURE_DIRLAYOUTHASH) 84 ceph_decode_copy_safe(p, end, &info->dir_layout, 85 sizeof(info->dir_layout), bad); 86 else 87 memset(&info->dir_layout, 0, sizeof(info->dir_layout)); 88 89 ceph_decode_32_safe(p, end, info->xattr_len, bad); 90 ceph_decode_need(p, end, info->xattr_len, bad); 91 info->xattr_data = *p; 92 *p += info->xattr_len; 93 94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) { 95 ceph_decode_64_safe(p, end, info->inline_version, bad); 96 ceph_decode_32_safe(p, end, info->inline_len, bad); 97 ceph_decode_need(p, end, info->inline_len, bad); 98 info->inline_data = *p; 99 *p += info->inline_len; 100 } else 101 info->inline_version = CEPH_INLINE_NONE; 102 103 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { 104 ceph_decode_32_safe(p, end, info->pool_ns_len, bad); 105 ceph_decode_need(p, end, info->pool_ns_len, bad); 106 *p += info->pool_ns_len; 107 } else { 108 info->pool_ns_len = 0; 109 } 110 111 return 0; 112 bad: 113 return err; 114 } 115 116 /* 117 * parse a normal reply, which may contain a (dir+)dentry and/or a 118 * target inode. 119 */ 120 static int parse_reply_info_trace(void **p, void *end, 121 struct ceph_mds_reply_info_parsed *info, 122 u64 features) 123 { 124 int err; 125 126 if (info->head->is_dentry) { 127 err = parse_reply_info_in(p, end, &info->diri, features); 128 if (err < 0) 129 goto out_bad; 130 131 if (unlikely(*p + sizeof(*info->dirfrag) > end)) 132 goto bad; 133 info->dirfrag = *p; 134 *p += sizeof(*info->dirfrag) + 135 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); 136 if (unlikely(*p > end)) 137 goto bad; 138 139 ceph_decode_32_safe(p, end, info->dname_len, bad); 140 ceph_decode_need(p, end, info->dname_len, bad); 141 info->dname = *p; 142 *p += info->dname_len; 143 info->dlease = *p; 144 *p += sizeof(*info->dlease); 145 } 146 147 if (info->head->is_target) { 148 err = parse_reply_info_in(p, end, &info->targeti, features); 149 if (err < 0) 150 goto out_bad; 151 } 152 153 if (unlikely(*p != end)) 154 goto bad; 155 return 0; 156 157 bad: 158 err = -EIO; 159 out_bad: 160 pr_err("problem parsing mds trace %d\n", err); 161 return err; 162 } 163 164 /* 165 * parse readdir results 166 */ 167 static int parse_reply_info_dir(void **p, void *end, 168 struct ceph_mds_reply_info_parsed *info, 169 u64 features) 170 { 171 u32 num, i = 0; 172 int err; 173 174 info->dir_dir = *p; 175 if (*p + sizeof(*info->dir_dir) > end) 176 goto bad; 177 *p += sizeof(*info->dir_dir) + 178 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); 179 if (*p > end) 180 goto bad; 181 182 ceph_decode_need(p, end, sizeof(num) + 2, bad); 183 num = ceph_decode_32(p); 184 info->dir_end = ceph_decode_8(p); 185 info->dir_complete = ceph_decode_8(p); 186 if (num == 0) 187 goto done; 188 189 BUG_ON(!info->dir_in); 190 info->dir_dname = (void *)(info->dir_in + num); 191 info->dir_dname_len = (void *)(info->dir_dname + num); 192 info->dir_dlease = (void *)(info->dir_dname_len + num); 193 if ((unsigned long)(info->dir_dlease + num) > 194 (unsigned long)info->dir_in + info->dir_buf_size) { 195 pr_err("dir contents are larger than expected\n"); 196 WARN_ON(1); 197 goto bad; 198 } 199 200 info->dir_nr = num; 201 while (num) { 202 /* dentry */ 203 ceph_decode_need(p, end, sizeof(u32)*2, bad); 204 info->dir_dname_len[i] = ceph_decode_32(p); 205 ceph_decode_need(p, end, info->dir_dname_len[i], bad); 206 info->dir_dname[i] = *p; 207 *p += info->dir_dname_len[i]; 208 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], 209 info->dir_dname[i]); 210 info->dir_dlease[i] = *p; 211 *p += sizeof(struct ceph_mds_reply_lease); 212 213 /* inode */ 214 err = parse_reply_info_in(p, end, &info->dir_in[i], features); 215 if (err < 0) 216 goto out_bad; 217 i++; 218 num--; 219 } 220 221 done: 222 if (*p != end) 223 goto bad; 224 return 0; 225 226 bad: 227 err = -EIO; 228 out_bad: 229 pr_err("problem parsing dir contents %d\n", err); 230 return err; 231 } 232 233 /* 234 * parse fcntl F_GETLK results 235 */ 236 static int parse_reply_info_filelock(void **p, void *end, 237 struct ceph_mds_reply_info_parsed *info, 238 u64 features) 239 { 240 if (*p + sizeof(*info->filelock_reply) > end) 241 goto bad; 242 243 info->filelock_reply = *p; 244 *p += sizeof(*info->filelock_reply); 245 246 if (unlikely(*p != end)) 247 goto bad; 248 return 0; 249 250 bad: 251 return -EIO; 252 } 253 254 /* 255 * parse create results 256 */ 257 static int parse_reply_info_create(void **p, void *end, 258 struct ceph_mds_reply_info_parsed *info, 259 u64 features) 260 { 261 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { 262 if (*p == end) { 263 info->has_create_ino = false; 264 } else { 265 info->has_create_ino = true; 266 info->ino = ceph_decode_64(p); 267 } 268 } 269 270 if (unlikely(*p != end)) 271 goto bad; 272 return 0; 273 274 bad: 275 return -EIO; 276 } 277 278 /* 279 * parse extra results 280 */ 281 static int parse_reply_info_extra(void **p, void *end, 282 struct ceph_mds_reply_info_parsed *info, 283 u64 features) 284 { 285 if (info->head->op == CEPH_MDS_OP_GETFILELOCK) 286 return parse_reply_info_filelock(p, end, info, features); 287 else if (info->head->op == CEPH_MDS_OP_READDIR || 288 info->head->op == CEPH_MDS_OP_LSSNAP) 289 return parse_reply_info_dir(p, end, info, features); 290 else if (info->head->op == CEPH_MDS_OP_CREATE) 291 return parse_reply_info_create(p, end, info, features); 292 else 293 return -EIO; 294 } 295 296 /* 297 * parse entire mds reply 298 */ 299 static int parse_reply_info(struct ceph_msg *msg, 300 struct ceph_mds_reply_info_parsed *info, 301 u64 features) 302 { 303 void *p, *end; 304 u32 len; 305 int err; 306 307 info->head = msg->front.iov_base; 308 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); 309 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); 310 311 /* trace */ 312 ceph_decode_32_safe(&p, end, len, bad); 313 if (len > 0) { 314 ceph_decode_need(&p, end, len, bad); 315 err = parse_reply_info_trace(&p, p+len, info, features); 316 if (err < 0) 317 goto out_bad; 318 } 319 320 /* extra */ 321 ceph_decode_32_safe(&p, end, len, bad); 322 if (len > 0) { 323 ceph_decode_need(&p, end, len, bad); 324 err = parse_reply_info_extra(&p, p+len, info, features); 325 if (err < 0) 326 goto out_bad; 327 } 328 329 /* snap blob */ 330 ceph_decode_32_safe(&p, end, len, bad); 331 info->snapblob_len = len; 332 info->snapblob = p; 333 p += len; 334 335 if (p != end) 336 goto bad; 337 return 0; 338 339 bad: 340 err = -EIO; 341 out_bad: 342 pr_err("mds parse_reply err %d\n", err); 343 return err; 344 } 345 346 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) 347 { 348 if (!info->dir_in) 349 return; 350 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size)); 351 } 352 353 354 /* 355 * sessions 356 */ 357 const char *ceph_session_state_name(int s) 358 { 359 switch (s) { 360 case CEPH_MDS_SESSION_NEW: return "new"; 361 case CEPH_MDS_SESSION_OPENING: return "opening"; 362 case CEPH_MDS_SESSION_OPEN: return "open"; 363 case CEPH_MDS_SESSION_HUNG: return "hung"; 364 case CEPH_MDS_SESSION_CLOSING: return "closing"; 365 case CEPH_MDS_SESSION_RESTARTING: return "restarting"; 366 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; 367 default: return "???"; 368 } 369 } 370 371 static struct ceph_mds_session *get_session(struct ceph_mds_session *s) 372 { 373 if (atomic_inc_not_zero(&s->s_ref)) { 374 dout("mdsc get_session %p %d -> %d\n", s, 375 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); 376 return s; 377 } else { 378 dout("mdsc get_session %p 0 -- FAIL", s); 379 return NULL; 380 } 381 } 382 383 void ceph_put_mds_session(struct ceph_mds_session *s) 384 { 385 dout("mdsc put_session %p %d -> %d\n", s, 386 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); 387 if (atomic_dec_and_test(&s->s_ref)) { 388 if (s->s_auth.authorizer) 389 ceph_auth_destroy_authorizer(s->s_auth.authorizer); 390 kfree(s); 391 } 392 } 393 394 /* 395 * called under mdsc->mutex 396 */ 397 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, 398 int mds) 399 { 400 struct ceph_mds_session *session; 401 402 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) 403 return NULL; 404 session = mdsc->sessions[mds]; 405 dout("lookup_mds_session %p %d\n", session, 406 atomic_read(&session->s_ref)); 407 get_session(session); 408 return session; 409 } 410 411 static bool __have_session(struct ceph_mds_client *mdsc, int mds) 412 { 413 if (mds >= mdsc->max_sessions) 414 return false; 415 return mdsc->sessions[mds]; 416 } 417 418 static int __verify_registered_session(struct ceph_mds_client *mdsc, 419 struct ceph_mds_session *s) 420 { 421 if (s->s_mds >= mdsc->max_sessions || 422 mdsc->sessions[s->s_mds] != s) 423 return -ENOENT; 424 return 0; 425 } 426 427 /* 428 * create+register a new session for given mds. 429 * called under mdsc->mutex. 430 */ 431 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, 432 int mds) 433 { 434 struct ceph_mds_session *s; 435 436 if (mds >= mdsc->mdsmap->m_max_mds) 437 return ERR_PTR(-EINVAL); 438 439 s = kzalloc(sizeof(*s), GFP_NOFS); 440 if (!s) 441 return ERR_PTR(-ENOMEM); 442 s->s_mdsc = mdsc; 443 s->s_mds = mds; 444 s->s_state = CEPH_MDS_SESSION_NEW; 445 s->s_ttl = 0; 446 s->s_seq = 0; 447 mutex_init(&s->s_mutex); 448 449 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); 450 451 spin_lock_init(&s->s_gen_ttl_lock); 452 s->s_cap_gen = 0; 453 s->s_cap_ttl = jiffies - 1; 454 455 spin_lock_init(&s->s_cap_lock); 456 s->s_renew_requested = 0; 457 s->s_renew_seq = 0; 458 INIT_LIST_HEAD(&s->s_caps); 459 s->s_nr_caps = 0; 460 s->s_trim_caps = 0; 461 atomic_set(&s->s_ref, 1); 462 INIT_LIST_HEAD(&s->s_waiting); 463 INIT_LIST_HEAD(&s->s_unsafe); 464 s->s_num_cap_releases = 0; 465 s->s_cap_reconnect = 0; 466 s->s_cap_iterator = NULL; 467 INIT_LIST_HEAD(&s->s_cap_releases); 468 INIT_LIST_HEAD(&s->s_cap_flushing); 469 INIT_LIST_HEAD(&s->s_cap_snaps_flushing); 470 471 dout("register_session mds%d\n", mds); 472 if (mds >= mdsc->max_sessions) { 473 int newmax = 1 << get_count_order(mds+1); 474 struct ceph_mds_session **sa; 475 476 dout("register_session realloc to %d\n", newmax); 477 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); 478 if (sa == NULL) 479 goto fail_realloc; 480 if (mdsc->sessions) { 481 memcpy(sa, mdsc->sessions, 482 mdsc->max_sessions * sizeof(void *)); 483 kfree(mdsc->sessions); 484 } 485 mdsc->sessions = sa; 486 mdsc->max_sessions = newmax; 487 } 488 mdsc->sessions[mds] = s; 489 atomic_inc(&mdsc->num_sessions); 490 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ 491 492 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, 493 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 494 495 return s; 496 497 fail_realloc: 498 kfree(s); 499 return ERR_PTR(-ENOMEM); 500 } 501 502 /* 503 * called under mdsc->mutex 504 */ 505 static void __unregister_session(struct ceph_mds_client *mdsc, 506 struct ceph_mds_session *s) 507 { 508 dout("__unregister_session mds%d %p\n", s->s_mds, s); 509 BUG_ON(mdsc->sessions[s->s_mds] != s); 510 mdsc->sessions[s->s_mds] = NULL; 511 ceph_con_close(&s->s_con); 512 ceph_put_mds_session(s); 513 atomic_dec(&mdsc->num_sessions); 514 } 515 516 /* 517 * drop session refs in request. 518 * 519 * should be last request ref, or hold mdsc->mutex 520 */ 521 static void put_request_session(struct ceph_mds_request *req) 522 { 523 if (req->r_session) { 524 ceph_put_mds_session(req->r_session); 525 req->r_session = NULL; 526 } 527 } 528 529 void ceph_mdsc_release_request(struct kref *kref) 530 { 531 struct ceph_mds_request *req = container_of(kref, 532 struct ceph_mds_request, 533 r_kref); 534 destroy_reply_info(&req->r_reply_info); 535 if (req->r_request) 536 ceph_msg_put(req->r_request); 537 if (req->r_reply) 538 ceph_msg_put(req->r_reply); 539 if (req->r_inode) { 540 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 541 iput(req->r_inode); 542 } 543 if (req->r_locked_dir) 544 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); 545 iput(req->r_target_inode); 546 if (req->r_dentry) 547 dput(req->r_dentry); 548 if (req->r_old_dentry) 549 dput(req->r_old_dentry); 550 if (req->r_old_dentry_dir) { 551 /* 552 * track (and drop pins for) r_old_dentry_dir 553 * separately, since r_old_dentry's d_parent may have 554 * changed between the dir mutex being dropped and 555 * this request being freed. 556 */ 557 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), 558 CEPH_CAP_PIN); 559 iput(req->r_old_dentry_dir); 560 } 561 kfree(req->r_path1); 562 kfree(req->r_path2); 563 if (req->r_pagelist) 564 ceph_pagelist_release(req->r_pagelist); 565 put_request_session(req); 566 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); 567 kfree(req); 568 } 569 570 /* 571 * lookup session, bump ref if found. 572 * 573 * called under mdsc->mutex. 574 */ 575 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, 576 u64 tid) 577 { 578 struct ceph_mds_request *req; 579 struct rb_node *n = mdsc->request_tree.rb_node; 580 581 while (n) { 582 req = rb_entry(n, struct ceph_mds_request, r_node); 583 if (tid < req->r_tid) 584 n = n->rb_left; 585 else if (tid > req->r_tid) 586 n = n->rb_right; 587 else { 588 ceph_mdsc_get_request(req); 589 return req; 590 } 591 } 592 return NULL; 593 } 594 595 static void __insert_request(struct ceph_mds_client *mdsc, 596 struct ceph_mds_request *new) 597 { 598 struct rb_node **p = &mdsc->request_tree.rb_node; 599 struct rb_node *parent = NULL; 600 struct ceph_mds_request *req = NULL; 601 602 while (*p) { 603 parent = *p; 604 req = rb_entry(parent, struct ceph_mds_request, r_node); 605 if (new->r_tid < req->r_tid) 606 p = &(*p)->rb_left; 607 else if (new->r_tid > req->r_tid) 608 p = &(*p)->rb_right; 609 else 610 BUG(); 611 } 612 613 rb_link_node(&new->r_node, parent, p); 614 rb_insert_color(&new->r_node, &mdsc->request_tree); 615 } 616 617 /* 618 * Register an in-flight request, and assign a tid. Link to directory 619 * are modifying (if any). 620 * 621 * Called under mdsc->mutex. 622 */ 623 static void __register_request(struct ceph_mds_client *mdsc, 624 struct ceph_mds_request *req, 625 struct inode *dir) 626 { 627 req->r_tid = ++mdsc->last_tid; 628 if (req->r_num_caps) 629 ceph_reserve_caps(mdsc, &req->r_caps_reservation, 630 req->r_num_caps); 631 dout("__register_request %p tid %lld\n", req, req->r_tid); 632 ceph_mdsc_get_request(req); 633 __insert_request(mdsc, req); 634 635 req->r_uid = current_fsuid(); 636 req->r_gid = current_fsgid(); 637 638 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) 639 mdsc->oldest_tid = req->r_tid; 640 641 if (dir) { 642 ihold(dir); 643 req->r_unsafe_dir = dir; 644 } 645 } 646 647 static void __unregister_request(struct ceph_mds_client *mdsc, 648 struct ceph_mds_request *req) 649 { 650 dout("__unregister_request %p tid %lld\n", req, req->r_tid); 651 652 if (req->r_tid == mdsc->oldest_tid) { 653 struct rb_node *p = rb_next(&req->r_node); 654 mdsc->oldest_tid = 0; 655 while (p) { 656 struct ceph_mds_request *next_req = 657 rb_entry(p, struct ceph_mds_request, r_node); 658 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { 659 mdsc->oldest_tid = next_req->r_tid; 660 break; 661 } 662 p = rb_next(p); 663 } 664 } 665 666 rb_erase(&req->r_node, &mdsc->request_tree); 667 RB_CLEAR_NODE(&req->r_node); 668 669 if (req->r_unsafe_dir && req->r_got_unsafe) { 670 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); 671 spin_lock(&ci->i_unsafe_lock); 672 list_del_init(&req->r_unsafe_dir_item); 673 spin_unlock(&ci->i_unsafe_lock); 674 } 675 if (req->r_target_inode && req->r_got_unsafe) { 676 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); 677 spin_lock(&ci->i_unsafe_lock); 678 list_del_init(&req->r_unsafe_target_item); 679 spin_unlock(&ci->i_unsafe_lock); 680 } 681 682 if (req->r_unsafe_dir) { 683 iput(req->r_unsafe_dir); 684 req->r_unsafe_dir = NULL; 685 } 686 687 complete_all(&req->r_safe_completion); 688 689 ceph_mdsc_put_request(req); 690 } 691 692 /* 693 * Choose mds to send request to next. If there is a hint set in the 694 * request (e.g., due to a prior forward hint from the mds), use that. 695 * Otherwise, consult frag tree and/or caps to identify the 696 * appropriate mds. If all else fails, choose randomly. 697 * 698 * Called under mdsc->mutex. 699 */ 700 static struct dentry *get_nonsnap_parent(struct dentry *dentry) 701 { 702 /* 703 * we don't need to worry about protecting the d_parent access 704 * here because we never renaming inside the snapped namespace 705 * except to resplice to another snapdir, and either the old or new 706 * result is a valid result. 707 */ 708 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) 709 dentry = dentry->d_parent; 710 return dentry; 711 } 712 713 static int __choose_mds(struct ceph_mds_client *mdsc, 714 struct ceph_mds_request *req) 715 { 716 struct inode *inode; 717 struct ceph_inode_info *ci; 718 struct ceph_cap *cap; 719 int mode = req->r_direct_mode; 720 int mds = -1; 721 u32 hash = req->r_direct_hash; 722 bool is_hash = req->r_direct_is_hash; 723 724 /* 725 * is there a specific mds we should try? ignore hint if we have 726 * no session and the mds is not up (active or recovering). 727 */ 728 if (req->r_resend_mds >= 0 && 729 (__have_session(mdsc, req->r_resend_mds) || 730 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { 731 dout("choose_mds using resend_mds mds%d\n", 732 req->r_resend_mds); 733 return req->r_resend_mds; 734 } 735 736 if (mode == USE_RANDOM_MDS) 737 goto random; 738 739 inode = NULL; 740 if (req->r_inode) { 741 inode = req->r_inode; 742 } else if (req->r_dentry) { 743 /* ignore race with rename; old or new d_parent is okay */ 744 struct dentry *parent = req->r_dentry->d_parent; 745 struct inode *dir = d_inode(parent); 746 747 if (dir->i_sb != mdsc->fsc->sb) { 748 /* not this fs! */ 749 inode = d_inode(req->r_dentry); 750 } else if (ceph_snap(dir) != CEPH_NOSNAP) { 751 /* direct snapped/virtual snapdir requests 752 * based on parent dir inode */ 753 struct dentry *dn = get_nonsnap_parent(parent); 754 inode = d_inode(dn); 755 dout("__choose_mds using nonsnap parent %p\n", inode); 756 } else { 757 /* dentry target */ 758 inode = d_inode(req->r_dentry); 759 if (!inode || mode == USE_AUTH_MDS) { 760 /* dir + name */ 761 inode = dir; 762 hash = ceph_dentry_hash(dir, req->r_dentry); 763 is_hash = true; 764 } 765 } 766 } 767 768 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, 769 (int)hash, mode); 770 if (!inode) 771 goto random; 772 ci = ceph_inode(inode); 773 774 if (is_hash && S_ISDIR(inode->i_mode)) { 775 struct ceph_inode_frag frag; 776 int found; 777 778 ceph_choose_frag(ci, hash, &frag, &found); 779 if (found) { 780 if (mode == USE_ANY_MDS && frag.ndist > 0) { 781 u8 r; 782 783 /* choose a random replica */ 784 get_random_bytes(&r, 1); 785 r %= frag.ndist; 786 mds = frag.dist[r]; 787 dout("choose_mds %p %llx.%llx " 788 "frag %u mds%d (%d/%d)\n", 789 inode, ceph_vinop(inode), 790 frag.frag, mds, 791 (int)r, frag.ndist); 792 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 793 CEPH_MDS_STATE_ACTIVE) 794 return mds; 795 } 796 797 /* since this file/dir wasn't known to be 798 * replicated, then we want to look for the 799 * authoritative mds. */ 800 mode = USE_AUTH_MDS; 801 if (frag.mds >= 0) { 802 /* choose auth mds */ 803 mds = frag.mds; 804 dout("choose_mds %p %llx.%llx " 805 "frag %u mds%d (auth)\n", 806 inode, ceph_vinop(inode), frag.frag, mds); 807 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 808 CEPH_MDS_STATE_ACTIVE) 809 return mds; 810 } 811 } 812 } 813 814 spin_lock(&ci->i_ceph_lock); 815 cap = NULL; 816 if (mode == USE_AUTH_MDS) 817 cap = ci->i_auth_cap; 818 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) 819 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); 820 if (!cap) { 821 spin_unlock(&ci->i_ceph_lock); 822 goto random; 823 } 824 mds = cap->session->s_mds; 825 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", 826 inode, ceph_vinop(inode), mds, 827 cap == ci->i_auth_cap ? "auth " : "", cap); 828 spin_unlock(&ci->i_ceph_lock); 829 return mds; 830 831 random: 832 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); 833 dout("choose_mds chose random mds%d\n", mds); 834 return mds; 835 } 836 837 838 /* 839 * session messages 840 */ 841 static struct ceph_msg *create_session_msg(u32 op, u64 seq) 842 { 843 struct ceph_msg *msg; 844 struct ceph_mds_session_head *h; 845 846 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, 847 false); 848 if (!msg) { 849 pr_err("create_session_msg ENOMEM creating msg\n"); 850 return NULL; 851 } 852 h = msg->front.iov_base; 853 h->op = cpu_to_le32(op); 854 h->seq = cpu_to_le64(seq); 855 856 return msg; 857 } 858 859 /* 860 * session message, specialization for CEPH_SESSION_REQUEST_OPEN 861 * to include additional client metadata fields. 862 */ 863 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) 864 { 865 struct ceph_msg *msg; 866 struct ceph_mds_session_head *h; 867 int i = -1; 868 int metadata_bytes = 0; 869 int metadata_key_count = 0; 870 struct ceph_options *opt = mdsc->fsc->client->options; 871 void *p; 872 873 const char* metadata[][2] = { 874 {"hostname", utsname()->nodename}, 875 {"kernel_version", utsname()->release}, 876 {"entity_id", opt->name ? opt->name : ""}, 877 {NULL, NULL} 878 }; 879 880 /* Calculate serialized length of metadata */ 881 metadata_bytes = 4; /* map length */ 882 for (i = 0; metadata[i][0] != NULL; ++i) { 883 metadata_bytes += 8 + strlen(metadata[i][0]) + 884 strlen(metadata[i][1]); 885 metadata_key_count++; 886 } 887 888 /* Allocate the message */ 889 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, 890 GFP_NOFS, false); 891 if (!msg) { 892 pr_err("create_session_msg ENOMEM creating msg\n"); 893 return NULL; 894 } 895 h = msg->front.iov_base; 896 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); 897 h->seq = cpu_to_le64(seq); 898 899 /* 900 * Serialize client metadata into waiting buffer space, using 901 * the format that userspace expects for map<string, string> 902 * 903 * ClientSession messages with metadata are v2 904 */ 905 msg->hdr.version = cpu_to_le16(2); 906 msg->hdr.compat_version = cpu_to_le16(1); 907 908 /* The write pointer, following the session_head structure */ 909 p = msg->front.iov_base + sizeof(*h); 910 911 /* Number of entries in the map */ 912 ceph_encode_32(&p, metadata_key_count); 913 914 /* Two length-prefixed strings for each entry in the map */ 915 for (i = 0; metadata[i][0] != NULL; ++i) { 916 size_t const key_len = strlen(metadata[i][0]); 917 size_t const val_len = strlen(metadata[i][1]); 918 919 ceph_encode_32(&p, key_len); 920 memcpy(p, metadata[i][0], key_len); 921 p += key_len; 922 ceph_encode_32(&p, val_len); 923 memcpy(p, metadata[i][1], val_len); 924 p += val_len; 925 } 926 927 return msg; 928 } 929 930 /* 931 * send session open request. 932 * 933 * called under mdsc->mutex 934 */ 935 static int __open_session(struct ceph_mds_client *mdsc, 936 struct ceph_mds_session *session) 937 { 938 struct ceph_msg *msg; 939 int mstate; 940 int mds = session->s_mds; 941 942 /* wait for mds to go active? */ 943 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); 944 dout("open_session to mds%d (%s)\n", mds, 945 ceph_mds_state_name(mstate)); 946 session->s_state = CEPH_MDS_SESSION_OPENING; 947 session->s_renew_requested = jiffies; 948 949 /* send connect message */ 950 msg = create_session_open_msg(mdsc, session->s_seq); 951 if (!msg) 952 return -ENOMEM; 953 ceph_con_send(&session->s_con, msg); 954 return 0; 955 } 956 957 /* 958 * open sessions for any export targets for the given mds 959 * 960 * called under mdsc->mutex 961 */ 962 static struct ceph_mds_session * 963 __open_export_target_session(struct ceph_mds_client *mdsc, int target) 964 { 965 struct ceph_mds_session *session; 966 967 session = __ceph_lookup_mds_session(mdsc, target); 968 if (!session) { 969 session = register_session(mdsc, target); 970 if (IS_ERR(session)) 971 return session; 972 } 973 if (session->s_state == CEPH_MDS_SESSION_NEW || 974 session->s_state == CEPH_MDS_SESSION_CLOSING) 975 __open_session(mdsc, session); 976 977 return session; 978 } 979 980 struct ceph_mds_session * 981 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) 982 { 983 struct ceph_mds_session *session; 984 985 dout("open_export_target_session to mds%d\n", target); 986 987 mutex_lock(&mdsc->mutex); 988 session = __open_export_target_session(mdsc, target); 989 mutex_unlock(&mdsc->mutex); 990 991 return session; 992 } 993 994 static void __open_export_target_sessions(struct ceph_mds_client *mdsc, 995 struct ceph_mds_session *session) 996 { 997 struct ceph_mds_info *mi; 998 struct ceph_mds_session *ts; 999 int i, mds = session->s_mds; 1000 1001 if (mds >= mdsc->mdsmap->m_max_mds) 1002 return; 1003 1004 mi = &mdsc->mdsmap->m_info[mds]; 1005 dout("open_export_target_sessions for mds%d (%d targets)\n", 1006 session->s_mds, mi->num_export_targets); 1007 1008 for (i = 0; i < mi->num_export_targets; i++) { 1009 ts = __open_export_target_session(mdsc, mi->export_targets[i]); 1010 if (!IS_ERR(ts)) 1011 ceph_put_mds_session(ts); 1012 } 1013 } 1014 1015 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, 1016 struct ceph_mds_session *session) 1017 { 1018 mutex_lock(&mdsc->mutex); 1019 __open_export_target_sessions(mdsc, session); 1020 mutex_unlock(&mdsc->mutex); 1021 } 1022 1023 /* 1024 * session caps 1025 */ 1026 1027 /* caller holds s_cap_lock, we drop it */ 1028 static void cleanup_cap_releases(struct ceph_mds_client *mdsc, 1029 struct ceph_mds_session *session) 1030 __releases(session->s_cap_lock) 1031 { 1032 LIST_HEAD(tmp_list); 1033 list_splice_init(&session->s_cap_releases, &tmp_list); 1034 session->s_num_cap_releases = 0; 1035 spin_unlock(&session->s_cap_lock); 1036 1037 dout("cleanup_cap_releases mds%d\n", session->s_mds); 1038 while (!list_empty(&tmp_list)) { 1039 struct ceph_cap *cap; 1040 /* zero out the in-progress message */ 1041 cap = list_first_entry(&tmp_list, 1042 struct ceph_cap, session_caps); 1043 list_del(&cap->session_caps); 1044 ceph_put_cap(mdsc, cap); 1045 } 1046 } 1047 1048 static void cleanup_session_requests(struct ceph_mds_client *mdsc, 1049 struct ceph_mds_session *session) 1050 { 1051 struct ceph_mds_request *req; 1052 struct rb_node *p; 1053 1054 dout("cleanup_session_requests mds%d\n", session->s_mds); 1055 mutex_lock(&mdsc->mutex); 1056 while (!list_empty(&session->s_unsafe)) { 1057 req = list_first_entry(&session->s_unsafe, 1058 struct ceph_mds_request, r_unsafe_item); 1059 list_del_init(&req->r_unsafe_item); 1060 pr_warn_ratelimited(" dropping unsafe request %llu\n", 1061 req->r_tid); 1062 __unregister_request(mdsc, req); 1063 } 1064 /* zero r_attempts, so kick_requests() will re-send requests */ 1065 p = rb_first(&mdsc->request_tree); 1066 while (p) { 1067 req = rb_entry(p, struct ceph_mds_request, r_node); 1068 p = rb_next(p); 1069 if (req->r_session && 1070 req->r_session->s_mds == session->s_mds) 1071 req->r_attempts = 0; 1072 } 1073 mutex_unlock(&mdsc->mutex); 1074 } 1075 1076 /* 1077 * Helper to safely iterate over all caps associated with a session, with 1078 * special care taken to handle a racing __ceph_remove_cap(). 1079 * 1080 * Caller must hold session s_mutex. 1081 */ 1082 static int iterate_session_caps(struct ceph_mds_session *session, 1083 int (*cb)(struct inode *, struct ceph_cap *, 1084 void *), void *arg) 1085 { 1086 struct list_head *p; 1087 struct ceph_cap *cap; 1088 struct inode *inode, *last_inode = NULL; 1089 struct ceph_cap *old_cap = NULL; 1090 int ret; 1091 1092 dout("iterate_session_caps %p mds%d\n", session, session->s_mds); 1093 spin_lock(&session->s_cap_lock); 1094 p = session->s_caps.next; 1095 while (p != &session->s_caps) { 1096 cap = list_entry(p, struct ceph_cap, session_caps); 1097 inode = igrab(&cap->ci->vfs_inode); 1098 if (!inode) { 1099 p = p->next; 1100 continue; 1101 } 1102 session->s_cap_iterator = cap; 1103 spin_unlock(&session->s_cap_lock); 1104 1105 if (last_inode) { 1106 iput(last_inode); 1107 last_inode = NULL; 1108 } 1109 if (old_cap) { 1110 ceph_put_cap(session->s_mdsc, old_cap); 1111 old_cap = NULL; 1112 } 1113 1114 ret = cb(inode, cap, arg); 1115 last_inode = inode; 1116 1117 spin_lock(&session->s_cap_lock); 1118 p = p->next; 1119 if (cap->ci == NULL) { 1120 dout("iterate_session_caps finishing cap %p removal\n", 1121 cap); 1122 BUG_ON(cap->session != session); 1123 cap->session = NULL; 1124 list_del_init(&cap->session_caps); 1125 session->s_nr_caps--; 1126 if (cap->queue_release) { 1127 list_add_tail(&cap->session_caps, 1128 &session->s_cap_releases); 1129 session->s_num_cap_releases++; 1130 } else { 1131 old_cap = cap; /* put_cap it w/o locks held */ 1132 } 1133 } 1134 if (ret < 0) 1135 goto out; 1136 } 1137 ret = 0; 1138 out: 1139 session->s_cap_iterator = NULL; 1140 spin_unlock(&session->s_cap_lock); 1141 1142 iput(last_inode); 1143 if (old_cap) 1144 ceph_put_cap(session->s_mdsc, old_cap); 1145 1146 return ret; 1147 } 1148 1149 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, 1150 void *arg) 1151 { 1152 struct ceph_inode_info *ci = ceph_inode(inode); 1153 LIST_HEAD(to_remove); 1154 int drop = 0; 1155 1156 dout("removing cap %p, ci is %p, inode is %p\n", 1157 cap, ci, &ci->vfs_inode); 1158 spin_lock(&ci->i_ceph_lock); 1159 __ceph_remove_cap(cap, false); 1160 if (!ci->i_auth_cap) { 1161 struct ceph_cap_flush *cf; 1162 struct ceph_mds_client *mdsc = 1163 ceph_sb_to_client(inode->i_sb)->mdsc; 1164 1165 while (true) { 1166 struct rb_node *n = rb_first(&ci->i_cap_flush_tree); 1167 if (!n) 1168 break; 1169 cf = rb_entry(n, struct ceph_cap_flush, i_node); 1170 rb_erase(&cf->i_node, &ci->i_cap_flush_tree); 1171 list_add(&cf->list, &to_remove); 1172 } 1173 1174 spin_lock(&mdsc->cap_dirty_lock); 1175 1176 list_for_each_entry(cf, &to_remove, list) 1177 rb_erase(&cf->g_node, &mdsc->cap_flush_tree); 1178 1179 if (!list_empty(&ci->i_dirty_item)) { 1180 pr_warn_ratelimited( 1181 " dropping dirty %s state for %p %lld\n", 1182 ceph_cap_string(ci->i_dirty_caps), 1183 inode, ceph_ino(inode)); 1184 ci->i_dirty_caps = 0; 1185 list_del_init(&ci->i_dirty_item); 1186 drop = 1; 1187 } 1188 if (!list_empty(&ci->i_flushing_item)) { 1189 pr_warn_ratelimited( 1190 " dropping dirty+flushing %s state for %p %lld\n", 1191 ceph_cap_string(ci->i_flushing_caps), 1192 inode, ceph_ino(inode)); 1193 ci->i_flushing_caps = 0; 1194 list_del_init(&ci->i_flushing_item); 1195 mdsc->num_cap_flushing--; 1196 drop = 1; 1197 } 1198 spin_unlock(&mdsc->cap_dirty_lock); 1199 1200 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) { 1201 list_add(&ci->i_prealloc_cap_flush->list, &to_remove); 1202 ci->i_prealloc_cap_flush = NULL; 1203 } 1204 } 1205 spin_unlock(&ci->i_ceph_lock); 1206 while (!list_empty(&to_remove)) { 1207 struct ceph_cap_flush *cf; 1208 cf = list_first_entry(&to_remove, 1209 struct ceph_cap_flush, list); 1210 list_del(&cf->list); 1211 ceph_free_cap_flush(cf); 1212 } 1213 while (drop--) 1214 iput(inode); 1215 return 0; 1216 } 1217 1218 /* 1219 * caller must hold session s_mutex 1220 */ 1221 static void remove_session_caps(struct ceph_mds_session *session) 1222 { 1223 dout("remove_session_caps on %p\n", session); 1224 iterate_session_caps(session, remove_session_caps_cb, NULL); 1225 1226 spin_lock(&session->s_cap_lock); 1227 if (session->s_nr_caps > 0) { 1228 struct super_block *sb = session->s_mdsc->fsc->sb; 1229 struct inode *inode; 1230 struct ceph_cap *cap, *prev = NULL; 1231 struct ceph_vino vino; 1232 /* 1233 * iterate_session_caps() skips inodes that are being 1234 * deleted, we need to wait until deletions are complete. 1235 * __wait_on_freeing_inode() is designed for the job, 1236 * but it is not exported, so use lookup inode function 1237 * to access it. 1238 */ 1239 while (!list_empty(&session->s_caps)) { 1240 cap = list_entry(session->s_caps.next, 1241 struct ceph_cap, session_caps); 1242 if (cap == prev) 1243 break; 1244 prev = cap; 1245 vino = cap->ci->i_vino; 1246 spin_unlock(&session->s_cap_lock); 1247 1248 inode = ceph_find_inode(sb, vino); 1249 iput(inode); 1250 1251 spin_lock(&session->s_cap_lock); 1252 } 1253 } 1254 1255 // drop cap expires and unlock s_cap_lock 1256 cleanup_cap_releases(session->s_mdsc, session); 1257 1258 BUG_ON(session->s_nr_caps > 0); 1259 BUG_ON(!list_empty(&session->s_cap_flushing)); 1260 } 1261 1262 /* 1263 * wake up any threads waiting on this session's caps. if the cap is 1264 * old (didn't get renewed on the client reconnect), remove it now. 1265 * 1266 * caller must hold s_mutex. 1267 */ 1268 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, 1269 void *arg) 1270 { 1271 struct ceph_inode_info *ci = ceph_inode(inode); 1272 1273 wake_up_all(&ci->i_cap_wq); 1274 if (arg) { 1275 spin_lock(&ci->i_ceph_lock); 1276 ci->i_wanted_max_size = 0; 1277 ci->i_requested_max_size = 0; 1278 spin_unlock(&ci->i_ceph_lock); 1279 } 1280 return 0; 1281 } 1282 1283 static void wake_up_session_caps(struct ceph_mds_session *session, 1284 int reconnect) 1285 { 1286 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); 1287 iterate_session_caps(session, wake_up_session_cb, 1288 (void *)(unsigned long)reconnect); 1289 } 1290 1291 /* 1292 * Send periodic message to MDS renewing all currently held caps. The 1293 * ack will reset the expiration for all caps from this session. 1294 * 1295 * caller holds s_mutex 1296 */ 1297 static int send_renew_caps(struct ceph_mds_client *mdsc, 1298 struct ceph_mds_session *session) 1299 { 1300 struct ceph_msg *msg; 1301 int state; 1302 1303 if (time_after_eq(jiffies, session->s_cap_ttl) && 1304 time_after_eq(session->s_cap_ttl, session->s_renew_requested)) 1305 pr_info("mds%d caps stale\n", session->s_mds); 1306 session->s_renew_requested = jiffies; 1307 1308 /* do not try to renew caps until a recovering mds has reconnected 1309 * with its clients. */ 1310 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); 1311 if (state < CEPH_MDS_STATE_RECONNECT) { 1312 dout("send_renew_caps ignoring mds%d (%s)\n", 1313 session->s_mds, ceph_mds_state_name(state)); 1314 return 0; 1315 } 1316 1317 dout("send_renew_caps to mds%d (%s)\n", session->s_mds, 1318 ceph_mds_state_name(state)); 1319 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, 1320 ++session->s_renew_seq); 1321 if (!msg) 1322 return -ENOMEM; 1323 ceph_con_send(&session->s_con, msg); 1324 return 0; 1325 } 1326 1327 static int send_flushmsg_ack(struct ceph_mds_client *mdsc, 1328 struct ceph_mds_session *session, u64 seq) 1329 { 1330 struct ceph_msg *msg; 1331 1332 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", 1333 session->s_mds, ceph_session_state_name(session->s_state), seq); 1334 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); 1335 if (!msg) 1336 return -ENOMEM; 1337 ceph_con_send(&session->s_con, msg); 1338 return 0; 1339 } 1340 1341 1342 /* 1343 * Note new cap ttl, and any transition from stale -> not stale (fresh?). 1344 * 1345 * Called under session->s_mutex 1346 */ 1347 static void renewed_caps(struct ceph_mds_client *mdsc, 1348 struct ceph_mds_session *session, int is_renew) 1349 { 1350 int was_stale; 1351 int wake = 0; 1352 1353 spin_lock(&session->s_cap_lock); 1354 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); 1355 1356 session->s_cap_ttl = session->s_renew_requested + 1357 mdsc->mdsmap->m_session_timeout*HZ; 1358 1359 if (was_stale) { 1360 if (time_before(jiffies, session->s_cap_ttl)) { 1361 pr_info("mds%d caps renewed\n", session->s_mds); 1362 wake = 1; 1363 } else { 1364 pr_info("mds%d caps still stale\n", session->s_mds); 1365 } 1366 } 1367 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", 1368 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", 1369 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); 1370 spin_unlock(&session->s_cap_lock); 1371 1372 if (wake) 1373 wake_up_session_caps(session, 0); 1374 } 1375 1376 /* 1377 * send a session close request 1378 */ 1379 static int request_close_session(struct ceph_mds_client *mdsc, 1380 struct ceph_mds_session *session) 1381 { 1382 struct ceph_msg *msg; 1383 1384 dout("request_close_session mds%d state %s seq %lld\n", 1385 session->s_mds, ceph_session_state_name(session->s_state), 1386 session->s_seq); 1387 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); 1388 if (!msg) 1389 return -ENOMEM; 1390 ceph_con_send(&session->s_con, msg); 1391 return 0; 1392 } 1393 1394 /* 1395 * Called with s_mutex held. 1396 */ 1397 static int __close_session(struct ceph_mds_client *mdsc, 1398 struct ceph_mds_session *session) 1399 { 1400 if (session->s_state >= CEPH_MDS_SESSION_CLOSING) 1401 return 0; 1402 session->s_state = CEPH_MDS_SESSION_CLOSING; 1403 return request_close_session(mdsc, session); 1404 } 1405 1406 /* 1407 * Trim old(er) caps. 1408 * 1409 * Because we can't cache an inode without one or more caps, we do 1410 * this indirectly: if a cap is unused, we prune its aliases, at which 1411 * point the inode will hopefully get dropped to. 1412 * 1413 * Yes, this is a bit sloppy. Our only real goal here is to respond to 1414 * memory pressure from the MDS, though, so it needn't be perfect. 1415 */ 1416 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) 1417 { 1418 struct ceph_mds_session *session = arg; 1419 struct ceph_inode_info *ci = ceph_inode(inode); 1420 int used, wanted, oissued, mine; 1421 1422 if (session->s_trim_caps <= 0) 1423 return -1; 1424 1425 spin_lock(&ci->i_ceph_lock); 1426 mine = cap->issued | cap->implemented; 1427 used = __ceph_caps_used(ci); 1428 wanted = __ceph_caps_file_wanted(ci); 1429 oissued = __ceph_caps_issued_other(ci, cap); 1430 1431 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", 1432 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), 1433 ceph_cap_string(used), ceph_cap_string(wanted)); 1434 if (cap == ci->i_auth_cap) { 1435 if (ci->i_dirty_caps || ci->i_flushing_caps || 1436 !list_empty(&ci->i_cap_snaps)) 1437 goto out; 1438 if ((used | wanted) & CEPH_CAP_ANY_WR) 1439 goto out; 1440 } 1441 /* The inode has cached pages, but it's no longer used. 1442 * we can safely drop it */ 1443 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE && 1444 !(oissued & CEPH_CAP_FILE_CACHE)) { 1445 used = 0; 1446 oissued = 0; 1447 } 1448 if ((used | wanted) & ~oissued & mine) 1449 goto out; /* we need these caps */ 1450 1451 session->s_trim_caps--; 1452 if (oissued) { 1453 /* we aren't the only cap.. just remove us */ 1454 __ceph_remove_cap(cap, true); 1455 } else { 1456 /* try dropping referring dentries */ 1457 spin_unlock(&ci->i_ceph_lock); 1458 d_prune_aliases(inode); 1459 dout("trim_caps_cb %p cap %p pruned, count now %d\n", 1460 inode, cap, atomic_read(&inode->i_count)); 1461 return 0; 1462 } 1463 1464 out: 1465 spin_unlock(&ci->i_ceph_lock); 1466 return 0; 1467 } 1468 1469 /* 1470 * Trim session cap count down to some max number. 1471 */ 1472 static int trim_caps(struct ceph_mds_client *mdsc, 1473 struct ceph_mds_session *session, 1474 int max_caps) 1475 { 1476 int trim_caps = session->s_nr_caps - max_caps; 1477 1478 dout("trim_caps mds%d start: %d / %d, trim %d\n", 1479 session->s_mds, session->s_nr_caps, max_caps, trim_caps); 1480 if (trim_caps > 0) { 1481 session->s_trim_caps = trim_caps; 1482 iterate_session_caps(session, trim_caps_cb, session); 1483 dout("trim_caps mds%d done: %d / %d, trimmed %d\n", 1484 session->s_mds, session->s_nr_caps, max_caps, 1485 trim_caps - session->s_trim_caps); 1486 session->s_trim_caps = 0; 1487 } 1488 1489 ceph_send_cap_releases(mdsc, session); 1490 return 0; 1491 } 1492 1493 static int check_capsnap_flush(struct ceph_inode_info *ci, 1494 u64 want_snap_seq) 1495 { 1496 int ret = 1; 1497 spin_lock(&ci->i_ceph_lock); 1498 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) { 1499 struct ceph_cap_snap *capsnap = 1500 list_first_entry(&ci->i_cap_snaps, 1501 struct ceph_cap_snap, ci_item); 1502 ret = capsnap->follows >= want_snap_seq; 1503 } 1504 spin_unlock(&ci->i_ceph_lock); 1505 return ret; 1506 } 1507 1508 static int check_caps_flush(struct ceph_mds_client *mdsc, 1509 u64 want_flush_tid) 1510 { 1511 struct rb_node *n; 1512 struct ceph_cap_flush *cf; 1513 int ret = 1; 1514 1515 spin_lock(&mdsc->cap_dirty_lock); 1516 n = rb_first(&mdsc->cap_flush_tree); 1517 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL; 1518 if (cf && cf->tid <= want_flush_tid) { 1519 dout("check_caps_flush still flushing tid %llu <= %llu\n", 1520 cf->tid, want_flush_tid); 1521 ret = 0; 1522 } 1523 spin_unlock(&mdsc->cap_dirty_lock); 1524 return ret; 1525 } 1526 1527 /* 1528 * flush all dirty inode data to disk. 1529 * 1530 * returns true if we've flushed through want_flush_tid 1531 */ 1532 static void wait_caps_flush(struct ceph_mds_client *mdsc, 1533 u64 want_flush_tid, u64 want_snap_seq) 1534 { 1535 int mds; 1536 1537 dout("check_caps_flush want %llu snap want %llu\n", 1538 want_flush_tid, want_snap_seq); 1539 mutex_lock(&mdsc->mutex); 1540 for (mds = 0; mds < mdsc->max_sessions; ) { 1541 struct ceph_mds_session *session = mdsc->sessions[mds]; 1542 struct inode *inode = NULL; 1543 1544 if (!session) { 1545 mds++; 1546 continue; 1547 } 1548 get_session(session); 1549 mutex_unlock(&mdsc->mutex); 1550 1551 mutex_lock(&session->s_mutex); 1552 if (!list_empty(&session->s_cap_snaps_flushing)) { 1553 struct ceph_cap_snap *capsnap = 1554 list_first_entry(&session->s_cap_snaps_flushing, 1555 struct ceph_cap_snap, 1556 flushing_item); 1557 struct ceph_inode_info *ci = capsnap->ci; 1558 if (!check_capsnap_flush(ci, want_snap_seq)) { 1559 dout("check_cap_flush still flushing snap %p " 1560 "follows %lld <= %lld to mds%d\n", 1561 &ci->vfs_inode, capsnap->follows, 1562 want_snap_seq, mds); 1563 inode = igrab(&ci->vfs_inode); 1564 } 1565 } 1566 mutex_unlock(&session->s_mutex); 1567 ceph_put_mds_session(session); 1568 1569 if (inode) { 1570 wait_event(mdsc->cap_flushing_wq, 1571 check_capsnap_flush(ceph_inode(inode), 1572 want_snap_seq)); 1573 iput(inode); 1574 } else { 1575 mds++; 1576 } 1577 1578 mutex_lock(&mdsc->mutex); 1579 } 1580 mutex_unlock(&mdsc->mutex); 1581 1582 wait_event(mdsc->cap_flushing_wq, 1583 check_caps_flush(mdsc, want_flush_tid)); 1584 1585 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid); 1586 } 1587 1588 /* 1589 * called under s_mutex 1590 */ 1591 void ceph_send_cap_releases(struct ceph_mds_client *mdsc, 1592 struct ceph_mds_session *session) 1593 { 1594 struct ceph_msg *msg = NULL; 1595 struct ceph_mds_cap_release *head; 1596 struct ceph_mds_cap_item *item; 1597 struct ceph_cap *cap; 1598 LIST_HEAD(tmp_list); 1599 int num_cap_releases; 1600 1601 spin_lock(&session->s_cap_lock); 1602 again: 1603 list_splice_init(&session->s_cap_releases, &tmp_list); 1604 num_cap_releases = session->s_num_cap_releases; 1605 session->s_num_cap_releases = 0; 1606 spin_unlock(&session->s_cap_lock); 1607 1608 while (!list_empty(&tmp_list)) { 1609 if (!msg) { 1610 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, 1611 PAGE_SIZE, GFP_NOFS, false); 1612 if (!msg) 1613 goto out_err; 1614 head = msg->front.iov_base; 1615 head->num = cpu_to_le32(0); 1616 msg->front.iov_len = sizeof(*head); 1617 } 1618 cap = list_first_entry(&tmp_list, struct ceph_cap, 1619 session_caps); 1620 list_del(&cap->session_caps); 1621 num_cap_releases--; 1622 1623 head = msg->front.iov_base; 1624 le32_add_cpu(&head->num, 1); 1625 item = msg->front.iov_base + msg->front.iov_len; 1626 item->ino = cpu_to_le64(cap->cap_ino); 1627 item->cap_id = cpu_to_le64(cap->cap_id); 1628 item->migrate_seq = cpu_to_le32(cap->mseq); 1629 item->seq = cpu_to_le32(cap->issue_seq); 1630 msg->front.iov_len += sizeof(*item); 1631 1632 ceph_put_cap(mdsc, cap); 1633 1634 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { 1635 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 1636 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); 1637 ceph_con_send(&session->s_con, msg); 1638 msg = NULL; 1639 } 1640 } 1641 1642 BUG_ON(num_cap_releases != 0); 1643 1644 spin_lock(&session->s_cap_lock); 1645 if (!list_empty(&session->s_cap_releases)) 1646 goto again; 1647 spin_unlock(&session->s_cap_lock); 1648 1649 if (msg) { 1650 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 1651 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); 1652 ceph_con_send(&session->s_con, msg); 1653 } 1654 return; 1655 out_err: 1656 pr_err("send_cap_releases mds%d, failed to allocate message\n", 1657 session->s_mds); 1658 spin_lock(&session->s_cap_lock); 1659 list_splice(&tmp_list, &session->s_cap_releases); 1660 session->s_num_cap_releases += num_cap_releases; 1661 spin_unlock(&session->s_cap_lock); 1662 } 1663 1664 /* 1665 * requests 1666 */ 1667 1668 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 1669 struct inode *dir) 1670 { 1671 struct ceph_inode_info *ci = ceph_inode(dir); 1672 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1673 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; 1674 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) + 1675 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease); 1676 int order, num_entries; 1677 1678 spin_lock(&ci->i_ceph_lock); 1679 num_entries = ci->i_files + ci->i_subdirs; 1680 spin_unlock(&ci->i_ceph_lock); 1681 num_entries = max(num_entries, 1); 1682 num_entries = min(num_entries, opt->max_readdir); 1683 1684 order = get_order(size * num_entries); 1685 while (order >= 0) { 1686 rinfo->dir_in = (void*)__get_free_pages(GFP_KERNEL | 1687 __GFP_NOWARN, 1688 order); 1689 if (rinfo->dir_in) 1690 break; 1691 order--; 1692 } 1693 if (!rinfo->dir_in) 1694 return -ENOMEM; 1695 1696 num_entries = (PAGE_SIZE << order) / size; 1697 num_entries = min(num_entries, opt->max_readdir); 1698 1699 rinfo->dir_buf_size = PAGE_SIZE << order; 1700 req->r_num_caps = num_entries + 1; 1701 req->r_args.readdir.max_entries = cpu_to_le32(num_entries); 1702 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); 1703 return 0; 1704 } 1705 1706 /* 1707 * Create an mds request. 1708 */ 1709 struct ceph_mds_request * 1710 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) 1711 { 1712 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); 1713 1714 if (!req) 1715 return ERR_PTR(-ENOMEM); 1716 1717 mutex_init(&req->r_fill_mutex); 1718 req->r_mdsc = mdsc; 1719 req->r_started = jiffies; 1720 req->r_resend_mds = -1; 1721 INIT_LIST_HEAD(&req->r_unsafe_dir_item); 1722 INIT_LIST_HEAD(&req->r_unsafe_target_item); 1723 req->r_fmode = -1; 1724 kref_init(&req->r_kref); 1725 INIT_LIST_HEAD(&req->r_wait); 1726 init_completion(&req->r_completion); 1727 init_completion(&req->r_safe_completion); 1728 INIT_LIST_HEAD(&req->r_unsafe_item); 1729 1730 req->r_stamp = current_fs_time(mdsc->fsc->sb); 1731 1732 req->r_op = op; 1733 req->r_direct_mode = mode; 1734 return req; 1735 } 1736 1737 /* 1738 * return oldest (lowest) request, tid in request tree, 0 if none. 1739 * 1740 * called under mdsc->mutex. 1741 */ 1742 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) 1743 { 1744 if (RB_EMPTY_ROOT(&mdsc->request_tree)) 1745 return NULL; 1746 return rb_entry(rb_first(&mdsc->request_tree), 1747 struct ceph_mds_request, r_node); 1748 } 1749 1750 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) 1751 { 1752 return mdsc->oldest_tid; 1753 } 1754 1755 /* 1756 * Build a dentry's path. Allocate on heap; caller must kfree. Based 1757 * on build_path_from_dentry in fs/cifs/dir.c. 1758 * 1759 * If @stop_on_nosnap, generate path relative to the first non-snapped 1760 * inode. 1761 * 1762 * Encode hidden .snap dirs as a double /, i.e. 1763 * foo/.snap/bar -> foo//bar 1764 */ 1765 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, 1766 int stop_on_nosnap) 1767 { 1768 struct dentry *temp; 1769 char *path; 1770 int len, pos; 1771 unsigned seq; 1772 1773 if (dentry == NULL) 1774 return ERR_PTR(-EINVAL); 1775 1776 retry: 1777 len = 0; 1778 seq = read_seqbegin(&rename_lock); 1779 rcu_read_lock(); 1780 for (temp = dentry; !IS_ROOT(temp);) { 1781 struct inode *inode = d_inode(temp); 1782 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) 1783 len++; /* slash only */ 1784 else if (stop_on_nosnap && inode && 1785 ceph_snap(inode) == CEPH_NOSNAP) 1786 break; 1787 else 1788 len += 1 + temp->d_name.len; 1789 temp = temp->d_parent; 1790 } 1791 rcu_read_unlock(); 1792 if (len) 1793 len--; /* no leading '/' */ 1794 1795 path = kmalloc(len+1, GFP_NOFS); 1796 if (path == NULL) 1797 return ERR_PTR(-ENOMEM); 1798 pos = len; 1799 path[pos] = 0; /* trailing null */ 1800 rcu_read_lock(); 1801 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { 1802 struct inode *inode; 1803 1804 spin_lock(&temp->d_lock); 1805 inode = d_inode(temp); 1806 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { 1807 dout("build_path path+%d: %p SNAPDIR\n", 1808 pos, temp); 1809 } else if (stop_on_nosnap && inode && 1810 ceph_snap(inode) == CEPH_NOSNAP) { 1811 spin_unlock(&temp->d_lock); 1812 break; 1813 } else { 1814 pos -= temp->d_name.len; 1815 if (pos < 0) { 1816 spin_unlock(&temp->d_lock); 1817 break; 1818 } 1819 strncpy(path + pos, temp->d_name.name, 1820 temp->d_name.len); 1821 } 1822 spin_unlock(&temp->d_lock); 1823 if (pos) 1824 path[--pos] = '/'; 1825 temp = temp->d_parent; 1826 } 1827 rcu_read_unlock(); 1828 if (pos != 0 || read_seqretry(&rename_lock, seq)) { 1829 pr_err("build_path did not end path lookup where " 1830 "expected, namelen is %d, pos is %d\n", len, pos); 1831 /* presumably this is only possible if racing with a 1832 rename of one of the parent directories (we can not 1833 lock the dentries above us to prevent this, but 1834 retrying should be harmless) */ 1835 kfree(path); 1836 goto retry; 1837 } 1838 1839 *base = ceph_ino(d_inode(temp)); 1840 *plen = len; 1841 dout("build_path on %p %d built %llx '%.*s'\n", 1842 dentry, d_count(dentry), *base, len, path); 1843 return path; 1844 } 1845 1846 static int build_dentry_path(struct dentry *dentry, 1847 const char **ppath, int *ppathlen, u64 *pino, 1848 int *pfreepath) 1849 { 1850 char *path; 1851 1852 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) { 1853 *pino = ceph_ino(d_inode(dentry->d_parent)); 1854 *ppath = dentry->d_name.name; 1855 *ppathlen = dentry->d_name.len; 1856 return 0; 1857 } 1858 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); 1859 if (IS_ERR(path)) 1860 return PTR_ERR(path); 1861 *ppath = path; 1862 *pfreepath = 1; 1863 return 0; 1864 } 1865 1866 static int build_inode_path(struct inode *inode, 1867 const char **ppath, int *ppathlen, u64 *pino, 1868 int *pfreepath) 1869 { 1870 struct dentry *dentry; 1871 char *path; 1872 1873 if (ceph_snap(inode) == CEPH_NOSNAP) { 1874 *pino = ceph_ino(inode); 1875 *ppathlen = 0; 1876 return 0; 1877 } 1878 dentry = d_find_alias(inode); 1879 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); 1880 dput(dentry); 1881 if (IS_ERR(path)) 1882 return PTR_ERR(path); 1883 *ppath = path; 1884 *pfreepath = 1; 1885 return 0; 1886 } 1887 1888 /* 1889 * request arguments may be specified via an inode *, a dentry *, or 1890 * an explicit ino+path. 1891 */ 1892 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, 1893 const char *rpath, u64 rino, 1894 const char **ppath, int *pathlen, 1895 u64 *ino, int *freepath) 1896 { 1897 int r = 0; 1898 1899 if (rinode) { 1900 r = build_inode_path(rinode, ppath, pathlen, ino, freepath); 1901 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), 1902 ceph_snap(rinode)); 1903 } else if (rdentry) { 1904 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); 1905 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, 1906 *ppath); 1907 } else if (rpath || rino) { 1908 *ino = rino; 1909 *ppath = rpath; 1910 *pathlen = rpath ? strlen(rpath) : 0; 1911 dout(" path %.*s\n", *pathlen, rpath); 1912 } 1913 1914 return r; 1915 } 1916 1917 /* 1918 * called under mdsc->mutex 1919 */ 1920 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, 1921 struct ceph_mds_request *req, 1922 int mds, bool drop_cap_releases) 1923 { 1924 struct ceph_msg *msg; 1925 struct ceph_mds_request_head *head; 1926 const char *path1 = NULL; 1927 const char *path2 = NULL; 1928 u64 ino1 = 0, ino2 = 0; 1929 int pathlen1 = 0, pathlen2 = 0; 1930 int freepath1 = 0, freepath2 = 0; 1931 int len; 1932 u16 releases; 1933 void *p, *end; 1934 int ret; 1935 1936 ret = set_request_path_attr(req->r_inode, req->r_dentry, 1937 req->r_path1, req->r_ino1.ino, 1938 &path1, &pathlen1, &ino1, &freepath1); 1939 if (ret < 0) { 1940 msg = ERR_PTR(ret); 1941 goto out; 1942 } 1943 1944 ret = set_request_path_attr(NULL, req->r_old_dentry, 1945 req->r_path2, req->r_ino2.ino, 1946 &path2, &pathlen2, &ino2, &freepath2); 1947 if (ret < 0) { 1948 msg = ERR_PTR(ret); 1949 goto out_free1; 1950 } 1951 1952 len = sizeof(*head) + 1953 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + 1954 sizeof(struct ceph_timespec); 1955 1956 /* calculate (max) length for cap releases */ 1957 len += sizeof(struct ceph_mds_request_release) * 1958 (!!req->r_inode_drop + !!req->r_dentry_drop + 1959 !!req->r_old_inode_drop + !!req->r_old_dentry_drop); 1960 if (req->r_dentry_drop) 1961 len += req->r_dentry->d_name.len; 1962 if (req->r_old_dentry_drop) 1963 len += req->r_old_dentry->d_name.len; 1964 1965 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); 1966 if (!msg) { 1967 msg = ERR_PTR(-ENOMEM); 1968 goto out_free2; 1969 } 1970 1971 msg->hdr.version = cpu_to_le16(2); 1972 msg->hdr.tid = cpu_to_le64(req->r_tid); 1973 1974 head = msg->front.iov_base; 1975 p = msg->front.iov_base + sizeof(*head); 1976 end = msg->front.iov_base + msg->front.iov_len; 1977 1978 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); 1979 head->op = cpu_to_le32(req->r_op); 1980 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); 1981 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); 1982 head->args = req->r_args; 1983 1984 ceph_encode_filepath(&p, end, ino1, path1); 1985 ceph_encode_filepath(&p, end, ino2, path2); 1986 1987 /* make note of release offset, in case we need to replay */ 1988 req->r_request_release_offset = p - msg->front.iov_base; 1989 1990 /* cap releases */ 1991 releases = 0; 1992 if (req->r_inode_drop) 1993 releases += ceph_encode_inode_release(&p, 1994 req->r_inode ? req->r_inode : d_inode(req->r_dentry), 1995 mds, req->r_inode_drop, req->r_inode_unless, 0); 1996 if (req->r_dentry_drop) 1997 releases += ceph_encode_dentry_release(&p, req->r_dentry, 1998 mds, req->r_dentry_drop, req->r_dentry_unless); 1999 if (req->r_old_dentry_drop) 2000 releases += ceph_encode_dentry_release(&p, req->r_old_dentry, 2001 mds, req->r_old_dentry_drop, req->r_old_dentry_unless); 2002 if (req->r_old_inode_drop) 2003 releases += ceph_encode_inode_release(&p, 2004 d_inode(req->r_old_dentry), 2005 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); 2006 2007 if (drop_cap_releases) { 2008 releases = 0; 2009 p = msg->front.iov_base + req->r_request_release_offset; 2010 } 2011 2012 head->num_releases = cpu_to_le16(releases); 2013 2014 /* time stamp */ 2015 { 2016 struct ceph_timespec ts; 2017 ceph_encode_timespec(&ts, &req->r_stamp); 2018 ceph_encode_copy(&p, &ts, sizeof(ts)); 2019 } 2020 2021 BUG_ON(p > end); 2022 msg->front.iov_len = p - msg->front.iov_base; 2023 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2024 2025 if (req->r_pagelist) { 2026 struct ceph_pagelist *pagelist = req->r_pagelist; 2027 atomic_inc(&pagelist->refcnt); 2028 ceph_msg_data_add_pagelist(msg, pagelist); 2029 msg->hdr.data_len = cpu_to_le32(pagelist->length); 2030 } else { 2031 msg->hdr.data_len = 0; 2032 } 2033 2034 msg->hdr.data_off = cpu_to_le16(0); 2035 2036 out_free2: 2037 if (freepath2) 2038 kfree((char *)path2); 2039 out_free1: 2040 if (freepath1) 2041 kfree((char *)path1); 2042 out: 2043 return msg; 2044 } 2045 2046 /* 2047 * called under mdsc->mutex if error, under no mutex if 2048 * success. 2049 */ 2050 static void complete_request(struct ceph_mds_client *mdsc, 2051 struct ceph_mds_request *req) 2052 { 2053 if (req->r_callback) 2054 req->r_callback(mdsc, req); 2055 else 2056 complete_all(&req->r_completion); 2057 } 2058 2059 /* 2060 * called under mdsc->mutex 2061 */ 2062 static int __prepare_send_request(struct ceph_mds_client *mdsc, 2063 struct ceph_mds_request *req, 2064 int mds, bool drop_cap_releases) 2065 { 2066 struct ceph_mds_request_head *rhead; 2067 struct ceph_msg *msg; 2068 int flags = 0; 2069 2070 req->r_attempts++; 2071 if (req->r_inode) { 2072 struct ceph_cap *cap = 2073 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); 2074 2075 if (cap) 2076 req->r_sent_on_mseq = cap->mseq; 2077 else 2078 req->r_sent_on_mseq = -1; 2079 } 2080 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, 2081 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); 2082 2083 if (req->r_got_unsafe) { 2084 void *p; 2085 /* 2086 * Replay. Do not regenerate message (and rebuild 2087 * paths, etc.); just use the original message. 2088 * Rebuilding paths will break for renames because 2089 * d_move mangles the src name. 2090 */ 2091 msg = req->r_request; 2092 rhead = msg->front.iov_base; 2093 2094 flags = le32_to_cpu(rhead->flags); 2095 flags |= CEPH_MDS_FLAG_REPLAY; 2096 rhead->flags = cpu_to_le32(flags); 2097 2098 if (req->r_target_inode) 2099 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); 2100 2101 rhead->num_retry = req->r_attempts - 1; 2102 2103 /* remove cap/dentry releases from message */ 2104 rhead->num_releases = 0; 2105 2106 /* time stamp */ 2107 p = msg->front.iov_base + req->r_request_release_offset; 2108 { 2109 struct ceph_timespec ts; 2110 ceph_encode_timespec(&ts, &req->r_stamp); 2111 ceph_encode_copy(&p, &ts, sizeof(ts)); 2112 } 2113 2114 msg->front.iov_len = p - msg->front.iov_base; 2115 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2116 return 0; 2117 } 2118 2119 if (req->r_request) { 2120 ceph_msg_put(req->r_request); 2121 req->r_request = NULL; 2122 } 2123 msg = create_request_message(mdsc, req, mds, drop_cap_releases); 2124 if (IS_ERR(msg)) { 2125 req->r_err = PTR_ERR(msg); 2126 return PTR_ERR(msg); 2127 } 2128 req->r_request = msg; 2129 2130 rhead = msg->front.iov_base; 2131 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); 2132 if (req->r_got_unsafe) 2133 flags |= CEPH_MDS_FLAG_REPLAY; 2134 if (req->r_locked_dir) 2135 flags |= CEPH_MDS_FLAG_WANT_DENTRY; 2136 rhead->flags = cpu_to_le32(flags); 2137 rhead->num_fwd = req->r_num_fwd; 2138 rhead->num_retry = req->r_attempts - 1; 2139 rhead->ino = 0; 2140 2141 dout(" r_locked_dir = %p\n", req->r_locked_dir); 2142 return 0; 2143 } 2144 2145 /* 2146 * send request, or put it on the appropriate wait list. 2147 */ 2148 static int __do_request(struct ceph_mds_client *mdsc, 2149 struct ceph_mds_request *req) 2150 { 2151 struct ceph_mds_session *session = NULL; 2152 int mds = -1; 2153 int err = 0; 2154 2155 if (req->r_err || req->r_got_result) { 2156 if (req->r_aborted) 2157 __unregister_request(mdsc, req); 2158 goto out; 2159 } 2160 2161 if (req->r_timeout && 2162 time_after_eq(jiffies, req->r_started + req->r_timeout)) { 2163 dout("do_request timed out\n"); 2164 err = -EIO; 2165 goto finish; 2166 } 2167 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 2168 dout("do_request forced umount\n"); 2169 err = -EIO; 2170 goto finish; 2171 } 2172 2173 put_request_session(req); 2174 2175 mds = __choose_mds(mdsc, req); 2176 if (mds < 0 || 2177 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { 2178 dout("do_request no mds or not active, waiting for map\n"); 2179 list_add(&req->r_wait, &mdsc->waiting_for_map); 2180 goto out; 2181 } 2182 2183 /* get, open session */ 2184 session = __ceph_lookup_mds_session(mdsc, mds); 2185 if (!session) { 2186 session = register_session(mdsc, mds); 2187 if (IS_ERR(session)) { 2188 err = PTR_ERR(session); 2189 goto finish; 2190 } 2191 } 2192 req->r_session = get_session(session); 2193 2194 dout("do_request mds%d session %p state %s\n", mds, session, 2195 ceph_session_state_name(session->s_state)); 2196 if (session->s_state != CEPH_MDS_SESSION_OPEN && 2197 session->s_state != CEPH_MDS_SESSION_HUNG) { 2198 if (session->s_state == CEPH_MDS_SESSION_NEW || 2199 session->s_state == CEPH_MDS_SESSION_CLOSING) 2200 __open_session(mdsc, session); 2201 list_add(&req->r_wait, &session->s_waiting); 2202 goto out_session; 2203 } 2204 2205 /* send request */ 2206 req->r_resend_mds = -1; /* forget any previous mds hint */ 2207 2208 if (req->r_request_started == 0) /* note request start time */ 2209 req->r_request_started = jiffies; 2210 2211 err = __prepare_send_request(mdsc, req, mds, false); 2212 if (!err) { 2213 ceph_msg_get(req->r_request); 2214 ceph_con_send(&session->s_con, req->r_request); 2215 } 2216 2217 out_session: 2218 ceph_put_mds_session(session); 2219 finish: 2220 if (err) { 2221 dout("__do_request early error %d\n", err); 2222 req->r_err = err; 2223 complete_request(mdsc, req); 2224 __unregister_request(mdsc, req); 2225 } 2226 out: 2227 return err; 2228 } 2229 2230 /* 2231 * called under mdsc->mutex 2232 */ 2233 static void __wake_requests(struct ceph_mds_client *mdsc, 2234 struct list_head *head) 2235 { 2236 struct ceph_mds_request *req; 2237 LIST_HEAD(tmp_list); 2238 2239 list_splice_init(head, &tmp_list); 2240 2241 while (!list_empty(&tmp_list)) { 2242 req = list_entry(tmp_list.next, 2243 struct ceph_mds_request, r_wait); 2244 list_del_init(&req->r_wait); 2245 dout(" wake request %p tid %llu\n", req, req->r_tid); 2246 __do_request(mdsc, req); 2247 } 2248 } 2249 2250 /* 2251 * Wake up threads with requests pending for @mds, so that they can 2252 * resubmit their requests to a possibly different mds. 2253 */ 2254 static void kick_requests(struct ceph_mds_client *mdsc, int mds) 2255 { 2256 struct ceph_mds_request *req; 2257 struct rb_node *p = rb_first(&mdsc->request_tree); 2258 2259 dout("kick_requests mds%d\n", mds); 2260 while (p) { 2261 req = rb_entry(p, struct ceph_mds_request, r_node); 2262 p = rb_next(p); 2263 if (req->r_got_unsafe) 2264 continue; 2265 if (req->r_attempts > 0) 2266 continue; /* only new requests */ 2267 if (req->r_session && 2268 req->r_session->s_mds == mds) { 2269 dout(" kicking tid %llu\n", req->r_tid); 2270 list_del_init(&req->r_wait); 2271 __do_request(mdsc, req); 2272 } 2273 } 2274 } 2275 2276 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, 2277 struct ceph_mds_request *req) 2278 { 2279 dout("submit_request on %p\n", req); 2280 mutex_lock(&mdsc->mutex); 2281 __register_request(mdsc, req, NULL); 2282 __do_request(mdsc, req); 2283 mutex_unlock(&mdsc->mutex); 2284 } 2285 2286 /* 2287 * Synchrously perform an mds request. Take care of all of the 2288 * session setup, forwarding, retry details. 2289 */ 2290 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 2291 struct inode *dir, 2292 struct ceph_mds_request *req) 2293 { 2294 int err; 2295 2296 dout("do_request on %p\n", req); 2297 2298 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ 2299 if (req->r_inode) 2300 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 2301 if (req->r_locked_dir) 2302 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); 2303 if (req->r_old_dentry_dir) 2304 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), 2305 CEPH_CAP_PIN); 2306 2307 /* deny access to directories with pool_ns layouts */ 2308 if (req->r_inode && S_ISDIR(req->r_inode->i_mode) && 2309 ceph_inode(req->r_inode)->i_pool_ns_len) 2310 return -EIO; 2311 if (req->r_locked_dir && 2312 ceph_inode(req->r_locked_dir)->i_pool_ns_len) 2313 return -EIO; 2314 2315 /* issue */ 2316 mutex_lock(&mdsc->mutex); 2317 __register_request(mdsc, req, dir); 2318 __do_request(mdsc, req); 2319 2320 if (req->r_err) { 2321 err = req->r_err; 2322 goto out; 2323 } 2324 2325 /* wait */ 2326 mutex_unlock(&mdsc->mutex); 2327 dout("do_request waiting\n"); 2328 if (!req->r_timeout && req->r_wait_for_completion) { 2329 err = req->r_wait_for_completion(mdsc, req); 2330 } else { 2331 long timeleft = wait_for_completion_killable_timeout( 2332 &req->r_completion, 2333 ceph_timeout_jiffies(req->r_timeout)); 2334 if (timeleft > 0) 2335 err = 0; 2336 else if (!timeleft) 2337 err = -EIO; /* timed out */ 2338 else 2339 err = timeleft; /* killed */ 2340 } 2341 dout("do_request waited, got %d\n", err); 2342 mutex_lock(&mdsc->mutex); 2343 2344 /* only abort if we didn't race with a real reply */ 2345 if (req->r_got_result) { 2346 err = le32_to_cpu(req->r_reply_info.head->result); 2347 } else if (err < 0) { 2348 dout("aborted request %lld with %d\n", req->r_tid, err); 2349 2350 /* 2351 * ensure we aren't running concurrently with 2352 * ceph_fill_trace or ceph_readdir_prepopulate, which 2353 * rely on locks (dir mutex) held by our caller. 2354 */ 2355 mutex_lock(&req->r_fill_mutex); 2356 req->r_err = err; 2357 req->r_aborted = true; 2358 mutex_unlock(&req->r_fill_mutex); 2359 2360 if (req->r_locked_dir && 2361 (req->r_op & CEPH_MDS_OP_WRITE)) 2362 ceph_invalidate_dir_request(req); 2363 } else { 2364 err = req->r_err; 2365 } 2366 2367 out: 2368 mutex_unlock(&mdsc->mutex); 2369 dout("do_request %p done, result %d\n", req, err); 2370 return err; 2371 } 2372 2373 /* 2374 * Invalidate dir's completeness, dentry lease state on an aborted MDS 2375 * namespace request. 2376 */ 2377 void ceph_invalidate_dir_request(struct ceph_mds_request *req) 2378 { 2379 struct inode *inode = req->r_locked_dir; 2380 2381 dout("invalidate_dir_request %p (complete, lease(s))\n", inode); 2382 2383 ceph_dir_clear_complete(inode); 2384 if (req->r_dentry) 2385 ceph_invalidate_dentry_lease(req->r_dentry); 2386 if (req->r_old_dentry) 2387 ceph_invalidate_dentry_lease(req->r_old_dentry); 2388 } 2389 2390 /* 2391 * Handle mds reply. 2392 * 2393 * We take the session mutex and parse and process the reply immediately. 2394 * This preserves the logical ordering of replies, capabilities, etc., sent 2395 * by the MDS as they are applied to our local cache. 2396 */ 2397 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) 2398 { 2399 struct ceph_mds_client *mdsc = session->s_mdsc; 2400 struct ceph_mds_request *req; 2401 struct ceph_mds_reply_head *head = msg->front.iov_base; 2402 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ 2403 struct ceph_snap_realm *realm; 2404 u64 tid; 2405 int err, result; 2406 int mds = session->s_mds; 2407 2408 if (msg->front.iov_len < sizeof(*head)) { 2409 pr_err("mdsc_handle_reply got corrupt (short) reply\n"); 2410 ceph_msg_dump(msg); 2411 return; 2412 } 2413 2414 /* get request, session */ 2415 tid = le64_to_cpu(msg->hdr.tid); 2416 mutex_lock(&mdsc->mutex); 2417 req = __lookup_request(mdsc, tid); 2418 if (!req) { 2419 dout("handle_reply on unknown tid %llu\n", tid); 2420 mutex_unlock(&mdsc->mutex); 2421 return; 2422 } 2423 dout("handle_reply %p\n", req); 2424 2425 /* correct session? */ 2426 if (req->r_session != session) { 2427 pr_err("mdsc_handle_reply got %llu on session mds%d" 2428 " not mds%d\n", tid, session->s_mds, 2429 req->r_session ? req->r_session->s_mds : -1); 2430 mutex_unlock(&mdsc->mutex); 2431 goto out; 2432 } 2433 2434 /* dup? */ 2435 if ((req->r_got_unsafe && !head->safe) || 2436 (req->r_got_safe && head->safe)) { 2437 pr_warn("got a dup %s reply on %llu from mds%d\n", 2438 head->safe ? "safe" : "unsafe", tid, mds); 2439 mutex_unlock(&mdsc->mutex); 2440 goto out; 2441 } 2442 if (req->r_got_safe) { 2443 pr_warn("got unsafe after safe on %llu from mds%d\n", 2444 tid, mds); 2445 mutex_unlock(&mdsc->mutex); 2446 goto out; 2447 } 2448 2449 result = le32_to_cpu(head->result); 2450 2451 /* 2452 * Handle an ESTALE 2453 * if we're not talking to the authority, send to them 2454 * if the authority has changed while we weren't looking, 2455 * send to new authority 2456 * Otherwise we just have to return an ESTALE 2457 */ 2458 if (result == -ESTALE) { 2459 dout("got ESTALE on request %llu", req->r_tid); 2460 req->r_resend_mds = -1; 2461 if (req->r_direct_mode != USE_AUTH_MDS) { 2462 dout("not using auth, setting for that now"); 2463 req->r_direct_mode = USE_AUTH_MDS; 2464 __do_request(mdsc, req); 2465 mutex_unlock(&mdsc->mutex); 2466 goto out; 2467 } else { 2468 int mds = __choose_mds(mdsc, req); 2469 if (mds >= 0 && mds != req->r_session->s_mds) { 2470 dout("but auth changed, so resending"); 2471 __do_request(mdsc, req); 2472 mutex_unlock(&mdsc->mutex); 2473 goto out; 2474 } 2475 } 2476 dout("have to return ESTALE on request %llu", req->r_tid); 2477 } 2478 2479 2480 if (head->safe) { 2481 req->r_got_safe = true; 2482 __unregister_request(mdsc, req); 2483 2484 if (req->r_got_unsafe) { 2485 /* 2486 * We already handled the unsafe response, now do the 2487 * cleanup. No need to examine the response; the MDS 2488 * doesn't include any result info in the safe 2489 * response. And even if it did, there is nothing 2490 * useful we could do with a revised return value. 2491 */ 2492 dout("got safe reply %llu, mds%d\n", tid, mds); 2493 list_del_init(&req->r_unsafe_item); 2494 2495 /* last unsafe request during umount? */ 2496 if (mdsc->stopping && !__get_oldest_req(mdsc)) 2497 complete_all(&mdsc->safe_umount_waiters); 2498 mutex_unlock(&mdsc->mutex); 2499 goto out; 2500 } 2501 } else { 2502 req->r_got_unsafe = true; 2503 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); 2504 if (req->r_unsafe_dir) { 2505 struct ceph_inode_info *ci = 2506 ceph_inode(req->r_unsafe_dir); 2507 spin_lock(&ci->i_unsafe_lock); 2508 list_add_tail(&req->r_unsafe_dir_item, 2509 &ci->i_unsafe_dirops); 2510 spin_unlock(&ci->i_unsafe_lock); 2511 } 2512 } 2513 2514 dout("handle_reply tid %lld result %d\n", tid, result); 2515 rinfo = &req->r_reply_info; 2516 err = parse_reply_info(msg, rinfo, session->s_con.peer_features); 2517 mutex_unlock(&mdsc->mutex); 2518 2519 mutex_lock(&session->s_mutex); 2520 if (err < 0) { 2521 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); 2522 ceph_msg_dump(msg); 2523 goto out_err; 2524 } 2525 2526 /* snap trace */ 2527 realm = NULL; 2528 if (rinfo->snapblob_len) { 2529 down_write(&mdsc->snap_rwsem); 2530 ceph_update_snap_trace(mdsc, rinfo->snapblob, 2531 rinfo->snapblob + rinfo->snapblob_len, 2532 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, 2533 &realm); 2534 downgrade_write(&mdsc->snap_rwsem); 2535 } else { 2536 down_read(&mdsc->snap_rwsem); 2537 } 2538 2539 /* insert trace into our cache */ 2540 mutex_lock(&req->r_fill_mutex); 2541 current->journal_info = req; 2542 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); 2543 if (err == 0) { 2544 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || 2545 req->r_op == CEPH_MDS_OP_LSSNAP)) 2546 ceph_readdir_prepopulate(req, req->r_session); 2547 ceph_unreserve_caps(mdsc, &req->r_caps_reservation); 2548 } 2549 current->journal_info = NULL; 2550 mutex_unlock(&req->r_fill_mutex); 2551 2552 up_read(&mdsc->snap_rwsem); 2553 if (realm) 2554 ceph_put_snap_realm(mdsc, realm); 2555 2556 if (err == 0 && req->r_got_unsafe && req->r_target_inode) { 2557 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); 2558 spin_lock(&ci->i_unsafe_lock); 2559 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops); 2560 spin_unlock(&ci->i_unsafe_lock); 2561 } 2562 out_err: 2563 mutex_lock(&mdsc->mutex); 2564 if (!req->r_aborted) { 2565 if (err) { 2566 req->r_err = err; 2567 } else { 2568 req->r_reply = ceph_msg_get(msg); 2569 req->r_got_result = true; 2570 } 2571 } else { 2572 dout("reply arrived after request %lld was aborted\n", tid); 2573 } 2574 mutex_unlock(&mdsc->mutex); 2575 2576 mutex_unlock(&session->s_mutex); 2577 2578 /* kick calling process */ 2579 complete_request(mdsc, req); 2580 out: 2581 ceph_mdsc_put_request(req); 2582 return; 2583 } 2584 2585 2586 2587 /* 2588 * handle mds notification that our request has been forwarded. 2589 */ 2590 static void handle_forward(struct ceph_mds_client *mdsc, 2591 struct ceph_mds_session *session, 2592 struct ceph_msg *msg) 2593 { 2594 struct ceph_mds_request *req; 2595 u64 tid = le64_to_cpu(msg->hdr.tid); 2596 u32 next_mds; 2597 u32 fwd_seq; 2598 int err = -EINVAL; 2599 void *p = msg->front.iov_base; 2600 void *end = p + msg->front.iov_len; 2601 2602 ceph_decode_need(&p, end, 2*sizeof(u32), bad); 2603 next_mds = ceph_decode_32(&p); 2604 fwd_seq = ceph_decode_32(&p); 2605 2606 mutex_lock(&mdsc->mutex); 2607 req = __lookup_request(mdsc, tid); 2608 if (!req) { 2609 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); 2610 goto out; /* dup reply? */ 2611 } 2612 2613 if (req->r_aborted) { 2614 dout("forward tid %llu aborted, unregistering\n", tid); 2615 __unregister_request(mdsc, req); 2616 } else if (fwd_seq <= req->r_num_fwd) { 2617 dout("forward tid %llu to mds%d - old seq %d <= %d\n", 2618 tid, next_mds, req->r_num_fwd, fwd_seq); 2619 } else { 2620 /* resend. forward race not possible; mds would drop */ 2621 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); 2622 BUG_ON(req->r_err); 2623 BUG_ON(req->r_got_result); 2624 req->r_attempts = 0; 2625 req->r_num_fwd = fwd_seq; 2626 req->r_resend_mds = next_mds; 2627 put_request_session(req); 2628 __do_request(mdsc, req); 2629 } 2630 ceph_mdsc_put_request(req); 2631 out: 2632 mutex_unlock(&mdsc->mutex); 2633 return; 2634 2635 bad: 2636 pr_err("mdsc_handle_forward decode error err=%d\n", err); 2637 } 2638 2639 /* 2640 * handle a mds session control message 2641 */ 2642 static void handle_session(struct ceph_mds_session *session, 2643 struct ceph_msg *msg) 2644 { 2645 struct ceph_mds_client *mdsc = session->s_mdsc; 2646 u32 op; 2647 u64 seq; 2648 int mds = session->s_mds; 2649 struct ceph_mds_session_head *h = msg->front.iov_base; 2650 int wake = 0; 2651 2652 /* decode */ 2653 if (msg->front.iov_len != sizeof(*h)) 2654 goto bad; 2655 op = le32_to_cpu(h->op); 2656 seq = le64_to_cpu(h->seq); 2657 2658 mutex_lock(&mdsc->mutex); 2659 if (op == CEPH_SESSION_CLOSE) 2660 __unregister_session(mdsc, session); 2661 /* FIXME: this ttl calculation is generous */ 2662 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; 2663 mutex_unlock(&mdsc->mutex); 2664 2665 mutex_lock(&session->s_mutex); 2666 2667 dout("handle_session mds%d %s %p state %s seq %llu\n", 2668 mds, ceph_session_op_name(op), session, 2669 ceph_session_state_name(session->s_state), seq); 2670 2671 if (session->s_state == CEPH_MDS_SESSION_HUNG) { 2672 session->s_state = CEPH_MDS_SESSION_OPEN; 2673 pr_info("mds%d came back\n", session->s_mds); 2674 } 2675 2676 switch (op) { 2677 case CEPH_SESSION_OPEN: 2678 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 2679 pr_info("mds%d reconnect success\n", session->s_mds); 2680 session->s_state = CEPH_MDS_SESSION_OPEN; 2681 renewed_caps(mdsc, session, 0); 2682 wake = 1; 2683 if (mdsc->stopping) 2684 __close_session(mdsc, session); 2685 break; 2686 2687 case CEPH_SESSION_RENEWCAPS: 2688 if (session->s_renew_seq == seq) 2689 renewed_caps(mdsc, session, 1); 2690 break; 2691 2692 case CEPH_SESSION_CLOSE: 2693 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 2694 pr_info("mds%d reconnect denied\n", session->s_mds); 2695 cleanup_session_requests(mdsc, session); 2696 remove_session_caps(session); 2697 wake = 2; /* for good measure */ 2698 wake_up_all(&mdsc->session_close_wq); 2699 break; 2700 2701 case CEPH_SESSION_STALE: 2702 pr_info("mds%d caps went stale, renewing\n", 2703 session->s_mds); 2704 spin_lock(&session->s_gen_ttl_lock); 2705 session->s_cap_gen++; 2706 session->s_cap_ttl = jiffies - 1; 2707 spin_unlock(&session->s_gen_ttl_lock); 2708 send_renew_caps(mdsc, session); 2709 break; 2710 2711 case CEPH_SESSION_RECALL_STATE: 2712 trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); 2713 break; 2714 2715 case CEPH_SESSION_FLUSHMSG: 2716 send_flushmsg_ack(mdsc, session, seq); 2717 break; 2718 2719 case CEPH_SESSION_FORCE_RO: 2720 dout("force_session_readonly %p\n", session); 2721 spin_lock(&session->s_cap_lock); 2722 session->s_readonly = true; 2723 spin_unlock(&session->s_cap_lock); 2724 wake_up_session_caps(session, 0); 2725 break; 2726 2727 default: 2728 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); 2729 WARN_ON(1); 2730 } 2731 2732 mutex_unlock(&session->s_mutex); 2733 if (wake) { 2734 mutex_lock(&mdsc->mutex); 2735 __wake_requests(mdsc, &session->s_waiting); 2736 if (wake == 2) 2737 kick_requests(mdsc, mds); 2738 mutex_unlock(&mdsc->mutex); 2739 } 2740 return; 2741 2742 bad: 2743 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, 2744 (int)msg->front.iov_len); 2745 ceph_msg_dump(msg); 2746 return; 2747 } 2748 2749 2750 /* 2751 * called under session->mutex. 2752 */ 2753 static void replay_unsafe_requests(struct ceph_mds_client *mdsc, 2754 struct ceph_mds_session *session) 2755 { 2756 struct ceph_mds_request *req, *nreq; 2757 struct rb_node *p; 2758 int err; 2759 2760 dout("replay_unsafe_requests mds%d\n", session->s_mds); 2761 2762 mutex_lock(&mdsc->mutex); 2763 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { 2764 err = __prepare_send_request(mdsc, req, session->s_mds, true); 2765 if (!err) { 2766 ceph_msg_get(req->r_request); 2767 ceph_con_send(&session->s_con, req->r_request); 2768 } 2769 } 2770 2771 /* 2772 * also re-send old requests when MDS enters reconnect stage. So that MDS 2773 * can process completed request in clientreplay stage. 2774 */ 2775 p = rb_first(&mdsc->request_tree); 2776 while (p) { 2777 req = rb_entry(p, struct ceph_mds_request, r_node); 2778 p = rb_next(p); 2779 if (req->r_got_unsafe) 2780 continue; 2781 if (req->r_attempts == 0) 2782 continue; /* only old requests */ 2783 if (req->r_session && 2784 req->r_session->s_mds == session->s_mds) { 2785 err = __prepare_send_request(mdsc, req, 2786 session->s_mds, true); 2787 if (!err) { 2788 ceph_msg_get(req->r_request); 2789 ceph_con_send(&session->s_con, req->r_request); 2790 } 2791 } 2792 } 2793 mutex_unlock(&mdsc->mutex); 2794 } 2795 2796 /* 2797 * Encode information about a cap for a reconnect with the MDS. 2798 */ 2799 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 2800 void *arg) 2801 { 2802 union { 2803 struct ceph_mds_cap_reconnect v2; 2804 struct ceph_mds_cap_reconnect_v1 v1; 2805 } rec; 2806 size_t reclen; 2807 struct ceph_inode_info *ci; 2808 struct ceph_reconnect_state *recon_state = arg; 2809 struct ceph_pagelist *pagelist = recon_state->pagelist; 2810 char *path; 2811 int pathlen, err; 2812 u64 pathbase; 2813 struct dentry *dentry; 2814 2815 ci = cap->ci; 2816 2817 dout(" adding %p ino %llx.%llx cap %p %lld %s\n", 2818 inode, ceph_vinop(inode), cap, cap->cap_id, 2819 ceph_cap_string(cap->issued)); 2820 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); 2821 if (err) 2822 return err; 2823 2824 dentry = d_find_alias(inode); 2825 if (dentry) { 2826 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); 2827 if (IS_ERR(path)) { 2828 err = PTR_ERR(path); 2829 goto out_dput; 2830 } 2831 } else { 2832 path = NULL; 2833 pathlen = 0; 2834 } 2835 err = ceph_pagelist_encode_string(pagelist, path, pathlen); 2836 if (err) 2837 goto out_free; 2838 2839 spin_lock(&ci->i_ceph_lock); 2840 cap->seq = 0; /* reset cap seq */ 2841 cap->issue_seq = 0; /* and issue_seq */ 2842 cap->mseq = 0; /* and migrate_seq */ 2843 cap->cap_gen = cap->session->s_cap_gen; 2844 2845 if (recon_state->flock) { 2846 rec.v2.cap_id = cpu_to_le64(cap->cap_id); 2847 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 2848 rec.v2.issued = cpu_to_le32(cap->issued); 2849 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 2850 rec.v2.pathbase = cpu_to_le64(pathbase); 2851 rec.v2.flock_len = 0; 2852 reclen = sizeof(rec.v2); 2853 } else { 2854 rec.v1.cap_id = cpu_to_le64(cap->cap_id); 2855 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 2856 rec.v1.issued = cpu_to_le32(cap->issued); 2857 rec.v1.size = cpu_to_le64(inode->i_size); 2858 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); 2859 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); 2860 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 2861 rec.v1.pathbase = cpu_to_le64(pathbase); 2862 reclen = sizeof(rec.v1); 2863 } 2864 spin_unlock(&ci->i_ceph_lock); 2865 2866 if (recon_state->flock) { 2867 int num_fcntl_locks, num_flock_locks; 2868 struct ceph_filelock *flocks; 2869 2870 encode_again: 2871 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); 2872 flocks = kmalloc((num_fcntl_locks+num_flock_locks) * 2873 sizeof(struct ceph_filelock), GFP_NOFS); 2874 if (!flocks) { 2875 err = -ENOMEM; 2876 goto out_free; 2877 } 2878 err = ceph_encode_locks_to_buffer(inode, flocks, 2879 num_fcntl_locks, 2880 num_flock_locks); 2881 if (err) { 2882 kfree(flocks); 2883 if (err == -ENOSPC) 2884 goto encode_again; 2885 goto out_free; 2886 } 2887 /* 2888 * number of encoded locks is stable, so copy to pagelist 2889 */ 2890 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + 2891 (num_fcntl_locks+num_flock_locks) * 2892 sizeof(struct ceph_filelock)); 2893 err = ceph_pagelist_append(pagelist, &rec, reclen); 2894 if (!err) 2895 err = ceph_locks_to_pagelist(flocks, pagelist, 2896 num_fcntl_locks, 2897 num_flock_locks); 2898 kfree(flocks); 2899 } else { 2900 err = ceph_pagelist_append(pagelist, &rec, reclen); 2901 } 2902 2903 recon_state->nr_caps++; 2904 out_free: 2905 kfree(path); 2906 out_dput: 2907 dput(dentry); 2908 return err; 2909 } 2910 2911 2912 /* 2913 * If an MDS fails and recovers, clients need to reconnect in order to 2914 * reestablish shared state. This includes all caps issued through 2915 * this session _and_ the snap_realm hierarchy. Because it's not 2916 * clear which snap realms the mds cares about, we send everything we 2917 * know about.. that ensures we'll then get any new info the 2918 * recovering MDS might have. 2919 * 2920 * This is a relatively heavyweight operation, but it's rare. 2921 * 2922 * called with mdsc->mutex held. 2923 */ 2924 static void send_mds_reconnect(struct ceph_mds_client *mdsc, 2925 struct ceph_mds_session *session) 2926 { 2927 struct ceph_msg *reply; 2928 struct rb_node *p; 2929 int mds = session->s_mds; 2930 int err = -ENOMEM; 2931 int s_nr_caps; 2932 struct ceph_pagelist *pagelist; 2933 struct ceph_reconnect_state recon_state; 2934 2935 pr_info("mds%d reconnect start\n", mds); 2936 2937 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); 2938 if (!pagelist) 2939 goto fail_nopagelist; 2940 ceph_pagelist_init(pagelist); 2941 2942 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); 2943 if (!reply) 2944 goto fail_nomsg; 2945 2946 mutex_lock(&session->s_mutex); 2947 session->s_state = CEPH_MDS_SESSION_RECONNECTING; 2948 session->s_seq = 0; 2949 2950 dout("session %p state %s\n", session, 2951 ceph_session_state_name(session->s_state)); 2952 2953 spin_lock(&session->s_gen_ttl_lock); 2954 session->s_cap_gen++; 2955 spin_unlock(&session->s_gen_ttl_lock); 2956 2957 spin_lock(&session->s_cap_lock); 2958 /* don't know if session is readonly */ 2959 session->s_readonly = 0; 2960 /* 2961 * notify __ceph_remove_cap() that we are composing cap reconnect. 2962 * If a cap get released before being added to the cap reconnect, 2963 * __ceph_remove_cap() should skip queuing cap release. 2964 */ 2965 session->s_cap_reconnect = 1; 2966 /* drop old cap expires; we're about to reestablish that state */ 2967 cleanup_cap_releases(mdsc, session); 2968 2969 /* trim unused caps to reduce MDS's cache rejoin time */ 2970 if (mdsc->fsc->sb->s_root) 2971 shrink_dcache_parent(mdsc->fsc->sb->s_root); 2972 2973 ceph_con_close(&session->s_con); 2974 ceph_con_open(&session->s_con, 2975 CEPH_ENTITY_TYPE_MDS, mds, 2976 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 2977 2978 /* replay unsafe requests */ 2979 replay_unsafe_requests(mdsc, session); 2980 2981 down_read(&mdsc->snap_rwsem); 2982 2983 /* traverse this session's caps */ 2984 s_nr_caps = session->s_nr_caps; 2985 err = ceph_pagelist_encode_32(pagelist, s_nr_caps); 2986 if (err) 2987 goto fail; 2988 2989 recon_state.nr_caps = 0; 2990 recon_state.pagelist = pagelist; 2991 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; 2992 err = iterate_session_caps(session, encode_caps_cb, &recon_state); 2993 if (err < 0) 2994 goto fail; 2995 2996 spin_lock(&session->s_cap_lock); 2997 session->s_cap_reconnect = 0; 2998 spin_unlock(&session->s_cap_lock); 2999 3000 /* 3001 * snaprealms. we provide mds with the ino, seq (version), and 3002 * parent for all of our realms. If the mds has any newer info, 3003 * it will tell us. 3004 */ 3005 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { 3006 struct ceph_snap_realm *realm = 3007 rb_entry(p, struct ceph_snap_realm, node); 3008 struct ceph_mds_snaprealm_reconnect sr_rec; 3009 3010 dout(" adding snap realm %llx seq %lld parent %llx\n", 3011 realm->ino, realm->seq, realm->parent_ino); 3012 sr_rec.ino = cpu_to_le64(realm->ino); 3013 sr_rec.seq = cpu_to_le64(realm->seq); 3014 sr_rec.parent = cpu_to_le64(realm->parent_ino); 3015 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); 3016 if (err) 3017 goto fail; 3018 } 3019 3020 if (recon_state.flock) 3021 reply->hdr.version = cpu_to_le16(2); 3022 3023 /* raced with cap release? */ 3024 if (s_nr_caps != recon_state.nr_caps) { 3025 struct page *page = list_first_entry(&pagelist->head, 3026 struct page, lru); 3027 __le32 *addr = kmap_atomic(page); 3028 *addr = cpu_to_le32(recon_state.nr_caps); 3029 kunmap_atomic(addr); 3030 } 3031 3032 reply->hdr.data_len = cpu_to_le32(pagelist->length); 3033 ceph_msg_data_add_pagelist(reply, pagelist); 3034 3035 ceph_early_kick_flushing_caps(mdsc, session); 3036 3037 ceph_con_send(&session->s_con, reply); 3038 3039 mutex_unlock(&session->s_mutex); 3040 3041 mutex_lock(&mdsc->mutex); 3042 __wake_requests(mdsc, &session->s_waiting); 3043 mutex_unlock(&mdsc->mutex); 3044 3045 up_read(&mdsc->snap_rwsem); 3046 return; 3047 3048 fail: 3049 ceph_msg_put(reply); 3050 up_read(&mdsc->snap_rwsem); 3051 mutex_unlock(&session->s_mutex); 3052 fail_nomsg: 3053 ceph_pagelist_release(pagelist); 3054 fail_nopagelist: 3055 pr_err("error %d preparing reconnect for mds%d\n", err, mds); 3056 return; 3057 } 3058 3059 3060 /* 3061 * compare old and new mdsmaps, kicking requests 3062 * and closing out old connections as necessary 3063 * 3064 * called under mdsc->mutex. 3065 */ 3066 static void check_new_map(struct ceph_mds_client *mdsc, 3067 struct ceph_mdsmap *newmap, 3068 struct ceph_mdsmap *oldmap) 3069 { 3070 int i; 3071 int oldstate, newstate; 3072 struct ceph_mds_session *s; 3073 3074 dout("check_new_map new %u old %u\n", 3075 newmap->m_epoch, oldmap->m_epoch); 3076 3077 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { 3078 if (mdsc->sessions[i] == NULL) 3079 continue; 3080 s = mdsc->sessions[i]; 3081 oldstate = ceph_mdsmap_get_state(oldmap, i); 3082 newstate = ceph_mdsmap_get_state(newmap, i); 3083 3084 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", 3085 i, ceph_mds_state_name(oldstate), 3086 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", 3087 ceph_mds_state_name(newstate), 3088 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", 3089 ceph_session_state_name(s->s_state)); 3090 3091 if (i >= newmap->m_max_mds || 3092 memcmp(ceph_mdsmap_get_addr(oldmap, i), 3093 ceph_mdsmap_get_addr(newmap, i), 3094 sizeof(struct ceph_entity_addr))) { 3095 if (s->s_state == CEPH_MDS_SESSION_OPENING) { 3096 /* the session never opened, just close it 3097 * out now */ 3098 __wake_requests(mdsc, &s->s_waiting); 3099 __unregister_session(mdsc, s); 3100 } else { 3101 /* just close it */ 3102 mutex_unlock(&mdsc->mutex); 3103 mutex_lock(&s->s_mutex); 3104 mutex_lock(&mdsc->mutex); 3105 ceph_con_close(&s->s_con); 3106 mutex_unlock(&s->s_mutex); 3107 s->s_state = CEPH_MDS_SESSION_RESTARTING; 3108 } 3109 } else if (oldstate == newstate) { 3110 continue; /* nothing new with this mds */ 3111 } 3112 3113 /* 3114 * send reconnect? 3115 */ 3116 if (s->s_state == CEPH_MDS_SESSION_RESTARTING && 3117 newstate >= CEPH_MDS_STATE_RECONNECT) { 3118 mutex_unlock(&mdsc->mutex); 3119 send_mds_reconnect(mdsc, s); 3120 mutex_lock(&mdsc->mutex); 3121 } 3122 3123 /* 3124 * kick request on any mds that has gone active. 3125 */ 3126 if (oldstate < CEPH_MDS_STATE_ACTIVE && 3127 newstate >= CEPH_MDS_STATE_ACTIVE) { 3128 if (oldstate != CEPH_MDS_STATE_CREATING && 3129 oldstate != CEPH_MDS_STATE_STARTING) 3130 pr_info("mds%d recovery completed\n", s->s_mds); 3131 kick_requests(mdsc, i); 3132 ceph_kick_flushing_caps(mdsc, s); 3133 wake_up_session_caps(s, 1); 3134 } 3135 } 3136 3137 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { 3138 s = mdsc->sessions[i]; 3139 if (!s) 3140 continue; 3141 if (!ceph_mdsmap_is_laggy(newmap, i)) 3142 continue; 3143 if (s->s_state == CEPH_MDS_SESSION_OPEN || 3144 s->s_state == CEPH_MDS_SESSION_HUNG || 3145 s->s_state == CEPH_MDS_SESSION_CLOSING) { 3146 dout(" connecting to export targets of laggy mds%d\n", 3147 i); 3148 __open_export_target_sessions(mdsc, s); 3149 } 3150 } 3151 } 3152 3153 3154 3155 /* 3156 * leases 3157 */ 3158 3159 /* 3160 * caller must hold session s_mutex, dentry->d_lock 3161 */ 3162 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) 3163 { 3164 struct ceph_dentry_info *di = ceph_dentry(dentry); 3165 3166 ceph_put_mds_session(di->lease_session); 3167 di->lease_session = NULL; 3168 } 3169 3170 static void handle_lease(struct ceph_mds_client *mdsc, 3171 struct ceph_mds_session *session, 3172 struct ceph_msg *msg) 3173 { 3174 struct super_block *sb = mdsc->fsc->sb; 3175 struct inode *inode; 3176 struct dentry *parent, *dentry; 3177 struct ceph_dentry_info *di; 3178 int mds = session->s_mds; 3179 struct ceph_mds_lease *h = msg->front.iov_base; 3180 u32 seq; 3181 struct ceph_vino vino; 3182 struct qstr dname; 3183 int release = 0; 3184 3185 dout("handle_lease from mds%d\n", mds); 3186 3187 /* decode */ 3188 if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) 3189 goto bad; 3190 vino.ino = le64_to_cpu(h->ino); 3191 vino.snap = CEPH_NOSNAP; 3192 seq = le32_to_cpu(h->seq); 3193 dname.name = (void *)h + sizeof(*h) + sizeof(u32); 3194 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); 3195 if (dname.len != get_unaligned_le32(h+1)) 3196 goto bad; 3197 3198 /* lookup inode */ 3199 inode = ceph_find_inode(sb, vino); 3200 dout("handle_lease %s, ino %llx %p %.*s\n", 3201 ceph_lease_op_name(h->action), vino.ino, inode, 3202 dname.len, dname.name); 3203 3204 mutex_lock(&session->s_mutex); 3205 session->s_seq++; 3206 3207 if (inode == NULL) { 3208 dout("handle_lease no inode %llx\n", vino.ino); 3209 goto release; 3210 } 3211 3212 /* dentry */ 3213 parent = d_find_alias(inode); 3214 if (!parent) { 3215 dout("no parent dentry on inode %p\n", inode); 3216 WARN_ON(1); 3217 goto release; /* hrm... */ 3218 } 3219 dname.hash = full_name_hash(dname.name, dname.len); 3220 dentry = d_lookup(parent, &dname); 3221 dput(parent); 3222 if (!dentry) 3223 goto release; 3224 3225 spin_lock(&dentry->d_lock); 3226 di = ceph_dentry(dentry); 3227 switch (h->action) { 3228 case CEPH_MDS_LEASE_REVOKE: 3229 if (di->lease_session == session) { 3230 if (ceph_seq_cmp(di->lease_seq, seq) > 0) 3231 h->seq = cpu_to_le32(di->lease_seq); 3232 __ceph_mdsc_drop_dentry_lease(dentry); 3233 } 3234 release = 1; 3235 break; 3236 3237 case CEPH_MDS_LEASE_RENEW: 3238 if (di->lease_session == session && 3239 di->lease_gen == session->s_cap_gen && 3240 di->lease_renew_from && 3241 di->lease_renew_after == 0) { 3242 unsigned long duration = 3243 msecs_to_jiffies(le32_to_cpu(h->duration_ms)); 3244 3245 di->lease_seq = seq; 3246 dentry->d_time = di->lease_renew_from + duration; 3247 di->lease_renew_after = di->lease_renew_from + 3248 (duration >> 1); 3249 di->lease_renew_from = 0; 3250 } 3251 break; 3252 } 3253 spin_unlock(&dentry->d_lock); 3254 dput(dentry); 3255 3256 if (!release) 3257 goto out; 3258 3259 release: 3260 /* let's just reuse the same message */ 3261 h->action = CEPH_MDS_LEASE_REVOKE_ACK; 3262 ceph_msg_get(msg); 3263 ceph_con_send(&session->s_con, msg); 3264 3265 out: 3266 iput(inode); 3267 mutex_unlock(&session->s_mutex); 3268 return; 3269 3270 bad: 3271 pr_err("corrupt lease message\n"); 3272 ceph_msg_dump(msg); 3273 } 3274 3275 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 3276 struct inode *inode, 3277 struct dentry *dentry, char action, 3278 u32 seq) 3279 { 3280 struct ceph_msg *msg; 3281 struct ceph_mds_lease *lease; 3282 int len = sizeof(*lease) + sizeof(u32); 3283 int dnamelen = 0; 3284 3285 dout("lease_send_msg inode %p dentry %p %s to mds%d\n", 3286 inode, dentry, ceph_lease_op_name(action), session->s_mds); 3287 dnamelen = dentry->d_name.len; 3288 len += dnamelen; 3289 3290 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); 3291 if (!msg) 3292 return; 3293 lease = msg->front.iov_base; 3294 lease->action = action; 3295 lease->ino = cpu_to_le64(ceph_vino(inode).ino); 3296 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); 3297 lease->seq = cpu_to_le32(seq); 3298 put_unaligned_le32(dnamelen, lease + 1); 3299 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); 3300 3301 /* 3302 * if this is a preemptive lease RELEASE, no need to 3303 * flush request stream, since the actual request will 3304 * soon follow. 3305 */ 3306 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); 3307 3308 ceph_con_send(&session->s_con, msg); 3309 } 3310 3311 /* 3312 * Preemptively release a lease we expect to invalidate anyway. 3313 * Pass @inode always, @dentry is optional. 3314 */ 3315 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, 3316 struct dentry *dentry) 3317 { 3318 struct ceph_dentry_info *di; 3319 struct ceph_mds_session *session; 3320 u32 seq; 3321 3322 BUG_ON(inode == NULL); 3323 BUG_ON(dentry == NULL); 3324 3325 /* is dentry lease valid? */ 3326 spin_lock(&dentry->d_lock); 3327 di = ceph_dentry(dentry); 3328 if (!di || !di->lease_session || 3329 di->lease_session->s_mds < 0 || 3330 di->lease_gen != di->lease_session->s_cap_gen || 3331 !time_before(jiffies, dentry->d_time)) { 3332 dout("lease_release inode %p dentry %p -- " 3333 "no lease\n", 3334 inode, dentry); 3335 spin_unlock(&dentry->d_lock); 3336 return; 3337 } 3338 3339 /* we do have a lease on this dentry; note mds and seq */ 3340 session = ceph_get_mds_session(di->lease_session); 3341 seq = di->lease_seq; 3342 __ceph_mdsc_drop_dentry_lease(dentry); 3343 spin_unlock(&dentry->d_lock); 3344 3345 dout("lease_release inode %p dentry %p to mds%d\n", 3346 inode, dentry, session->s_mds); 3347 ceph_mdsc_lease_send_msg(session, inode, dentry, 3348 CEPH_MDS_LEASE_RELEASE, seq); 3349 ceph_put_mds_session(session); 3350 } 3351 3352 /* 3353 * drop all leases (and dentry refs) in preparation for umount 3354 */ 3355 static void drop_leases(struct ceph_mds_client *mdsc) 3356 { 3357 int i; 3358 3359 dout("drop_leases\n"); 3360 mutex_lock(&mdsc->mutex); 3361 for (i = 0; i < mdsc->max_sessions; i++) { 3362 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); 3363 if (!s) 3364 continue; 3365 mutex_unlock(&mdsc->mutex); 3366 mutex_lock(&s->s_mutex); 3367 mutex_unlock(&s->s_mutex); 3368 ceph_put_mds_session(s); 3369 mutex_lock(&mdsc->mutex); 3370 } 3371 mutex_unlock(&mdsc->mutex); 3372 } 3373 3374 3375 3376 /* 3377 * delayed work -- periodically trim expired leases, renew caps with mds 3378 */ 3379 static void schedule_delayed(struct ceph_mds_client *mdsc) 3380 { 3381 int delay = 5; 3382 unsigned hz = round_jiffies_relative(HZ * delay); 3383 schedule_delayed_work(&mdsc->delayed_work, hz); 3384 } 3385 3386 static void delayed_work(struct work_struct *work) 3387 { 3388 int i; 3389 struct ceph_mds_client *mdsc = 3390 container_of(work, struct ceph_mds_client, delayed_work.work); 3391 int renew_interval; 3392 int renew_caps; 3393 3394 dout("mdsc delayed_work\n"); 3395 ceph_check_delayed_caps(mdsc); 3396 3397 mutex_lock(&mdsc->mutex); 3398 renew_interval = mdsc->mdsmap->m_session_timeout >> 2; 3399 renew_caps = time_after_eq(jiffies, HZ*renew_interval + 3400 mdsc->last_renew_caps); 3401 if (renew_caps) 3402 mdsc->last_renew_caps = jiffies; 3403 3404 for (i = 0; i < mdsc->max_sessions; i++) { 3405 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); 3406 if (s == NULL) 3407 continue; 3408 if (s->s_state == CEPH_MDS_SESSION_CLOSING) { 3409 dout("resending session close request for mds%d\n", 3410 s->s_mds); 3411 request_close_session(mdsc, s); 3412 ceph_put_mds_session(s); 3413 continue; 3414 } 3415 if (s->s_ttl && time_after(jiffies, s->s_ttl)) { 3416 if (s->s_state == CEPH_MDS_SESSION_OPEN) { 3417 s->s_state = CEPH_MDS_SESSION_HUNG; 3418 pr_info("mds%d hung\n", s->s_mds); 3419 } 3420 } 3421 if (s->s_state < CEPH_MDS_SESSION_OPEN) { 3422 /* this mds is failed or recovering, just wait */ 3423 ceph_put_mds_session(s); 3424 continue; 3425 } 3426 mutex_unlock(&mdsc->mutex); 3427 3428 mutex_lock(&s->s_mutex); 3429 if (renew_caps) 3430 send_renew_caps(mdsc, s); 3431 else 3432 ceph_con_keepalive(&s->s_con); 3433 if (s->s_state == CEPH_MDS_SESSION_OPEN || 3434 s->s_state == CEPH_MDS_SESSION_HUNG) 3435 ceph_send_cap_releases(mdsc, s); 3436 mutex_unlock(&s->s_mutex); 3437 ceph_put_mds_session(s); 3438 3439 mutex_lock(&mdsc->mutex); 3440 } 3441 mutex_unlock(&mdsc->mutex); 3442 3443 schedule_delayed(mdsc); 3444 } 3445 3446 int ceph_mdsc_init(struct ceph_fs_client *fsc) 3447 3448 { 3449 struct ceph_mds_client *mdsc; 3450 3451 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); 3452 if (!mdsc) 3453 return -ENOMEM; 3454 mdsc->fsc = fsc; 3455 fsc->mdsc = mdsc; 3456 mutex_init(&mdsc->mutex); 3457 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); 3458 if (mdsc->mdsmap == NULL) { 3459 kfree(mdsc); 3460 return -ENOMEM; 3461 } 3462 3463 init_completion(&mdsc->safe_umount_waiters); 3464 init_waitqueue_head(&mdsc->session_close_wq); 3465 INIT_LIST_HEAD(&mdsc->waiting_for_map); 3466 mdsc->sessions = NULL; 3467 atomic_set(&mdsc->num_sessions, 0); 3468 mdsc->max_sessions = 0; 3469 mdsc->stopping = 0; 3470 mdsc->last_snap_seq = 0; 3471 init_rwsem(&mdsc->snap_rwsem); 3472 mdsc->snap_realms = RB_ROOT; 3473 INIT_LIST_HEAD(&mdsc->snap_empty); 3474 spin_lock_init(&mdsc->snap_empty_lock); 3475 mdsc->last_tid = 0; 3476 mdsc->oldest_tid = 0; 3477 mdsc->request_tree = RB_ROOT; 3478 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); 3479 mdsc->last_renew_caps = jiffies; 3480 INIT_LIST_HEAD(&mdsc->cap_delay_list); 3481 spin_lock_init(&mdsc->cap_delay_lock); 3482 INIT_LIST_HEAD(&mdsc->snap_flush_list); 3483 spin_lock_init(&mdsc->snap_flush_lock); 3484 mdsc->last_cap_flush_tid = 1; 3485 mdsc->cap_flush_tree = RB_ROOT; 3486 INIT_LIST_HEAD(&mdsc->cap_dirty); 3487 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); 3488 mdsc->num_cap_flushing = 0; 3489 spin_lock_init(&mdsc->cap_dirty_lock); 3490 init_waitqueue_head(&mdsc->cap_flushing_wq); 3491 spin_lock_init(&mdsc->dentry_lru_lock); 3492 INIT_LIST_HEAD(&mdsc->dentry_lru); 3493 3494 ceph_caps_init(mdsc); 3495 ceph_adjust_min_caps(mdsc, fsc->min_caps); 3496 3497 init_rwsem(&mdsc->pool_perm_rwsem); 3498 mdsc->pool_perm_tree = RB_ROOT; 3499 3500 return 0; 3501 } 3502 3503 /* 3504 * Wait for safe replies on open mds requests. If we time out, drop 3505 * all requests from the tree to avoid dangling dentry refs. 3506 */ 3507 static void wait_requests(struct ceph_mds_client *mdsc) 3508 { 3509 struct ceph_options *opts = mdsc->fsc->client->options; 3510 struct ceph_mds_request *req; 3511 3512 mutex_lock(&mdsc->mutex); 3513 if (__get_oldest_req(mdsc)) { 3514 mutex_unlock(&mdsc->mutex); 3515 3516 dout("wait_requests waiting for requests\n"); 3517 wait_for_completion_timeout(&mdsc->safe_umount_waiters, 3518 ceph_timeout_jiffies(opts->mount_timeout)); 3519 3520 /* tear down remaining requests */ 3521 mutex_lock(&mdsc->mutex); 3522 while ((req = __get_oldest_req(mdsc))) { 3523 dout("wait_requests timed out on tid %llu\n", 3524 req->r_tid); 3525 __unregister_request(mdsc, req); 3526 } 3527 } 3528 mutex_unlock(&mdsc->mutex); 3529 dout("wait_requests done\n"); 3530 } 3531 3532 /* 3533 * called before mount is ro, and before dentries are torn down. 3534 * (hmm, does this still race with new lookups?) 3535 */ 3536 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) 3537 { 3538 dout("pre_umount\n"); 3539 mdsc->stopping = 1; 3540 3541 drop_leases(mdsc); 3542 ceph_flush_dirty_caps(mdsc); 3543 wait_requests(mdsc); 3544 3545 /* 3546 * wait for reply handlers to drop their request refs and 3547 * their inode/dcache refs 3548 */ 3549 ceph_msgr_flush(); 3550 } 3551 3552 /* 3553 * wait for all write mds requests to flush. 3554 */ 3555 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) 3556 { 3557 struct ceph_mds_request *req = NULL, *nextreq; 3558 struct rb_node *n; 3559 3560 mutex_lock(&mdsc->mutex); 3561 dout("wait_unsafe_requests want %lld\n", want_tid); 3562 restart: 3563 req = __get_oldest_req(mdsc); 3564 while (req && req->r_tid <= want_tid) { 3565 /* find next request */ 3566 n = rb_next(&req->r_node); 3567 if (n) 3568 nextreq = rb_entry(n, struct ceph_mds_request, r_node); 3569 else 3570 nextreq = NULL; 3571 if (req->r_op != CEPH_MDS_OP_SETFILELOCK && 3572 (req->r_op & CEPH_MDS_OP_WRITE)) { 3573 /* write op */ 3574 ceph_mdsc_get_request(req); 3575 if (nextreq) 3576 ceph_mdsc_get_request(nextreq); 3577 mutex_unlock(&mdsc->mutex); 3578 dout("wait_unsafe_requests wait on %llu (want %llu)\n", 3579 req->r_tid, want_tid); 3580 wait_for_completion(&req->r_safe_completion); 3581 mutex_lock(&mdsc->mutex); 3582 ceph_mdsc_put_request(req); 3583 if (!nextreq) 3584 break; /* next dne before, so we're done! */ 3585 if (RB_EMPTY_NODE(&nextreq->r_node)) { 3586 /* next request was removed from tree */ 3587 ceph_mdsc_put_request(nextreq); 3588 goto restart; 3589 } 3590 ceph_mdsc_put_request(nextreq); /* won't go away */ 3591 } 3592 req = nextreq; 3593 } 3594 mutex_unlock(&mdsc->mutex); 3595 dout("wait_unsafe_requests done\n"); 3596 } 3597 3598 void ceph_mdsc_sync(struct ceph_mds_client *mdsc) 3599 { 3600 u64 want_tid, want_flush, want_snap; 3601 3602 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) 3603 return; 3604 3605 dout("sync\n"); 3606 mutex_lock(&mdsc->mutex); 3607 want_tid = mdsc->last_tid; 3608 mutex_unlock(&mdsc->mutex); 3609 3610 ceph_flush_dirty_caps(mdsc); 3611 spin_lock(&mdsc->cap_dirty_lock); 3612 want_flush = mdsc->last_cap_flush_tid; 3613 spin_unlock(&mdsc->cap_dirty_lock); 3614 3615 down_read(&mdsc->snap_rwsem); 3616 want_snap = mdsc->last_snap_seq; 3617 up_read(&mdsc->snap_rwsem); 3618 3619 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n", 3620 want_tid, want_flush, want_snap); 3621 3622 wait_unsafe_requests(mdsc, want_tid); 3623 wait_caps_flush(mdsc, want_flush, want_snap); 3624 } 3625 3626 /* 3627 * true if all sessions are closed, or we force unmount 3628 */ 3629 static bool done_closing_sessions(struct ceph_mds_client *mdsc) 3630 { 3631 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) 3632 return true; 3633 return atomic_read(&mdsc->num_sessions) == 0; 3634 } 3635 3636 /* 3637 * called after sb is ro. 3638 */ 3639 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) 3640 { 3641 struct ceph_options *opts = mdsc->fsc->client->options; 3642 struct ceph_mds_session *session; 3643 int i; 3644 3645 dout("close_sessions\n"); 3646 3647 /* close sessions */ 3648 mutex_lock(&mdsc->mutex); 3649 for (i = 0; i < mdsc->max_sessions; i++) { 3650 session = __ceph_lookup_mds_session(mdsc, i); 3651 if (!session) 3652 continue; 3653 mutex_unlock(&mdsc->mutex); 3654 mutex_lock(&session->s_mutex); 3655 __close_session(mdsc, session); 3656 mutex_unlock(&session->s_mutex); 3657 ceph_put_mds_session(session); 3658 mutex_lock(&mdsc->mutex); 3659 } 3660 mutex_unlock(&mdsc->mutex); 3661 3662 dout("waiting for sessions to close\n"); 3663 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), 3664 ceph_timeout_jiffies(opts->mount_timeout)); 3665 3666 /* tear down remaining sessions */ 3667 mutex_lock(&mdsc->mutex); 3668 for (i = 0; i < mdsc->max_sessions; i++) { 3669 if (mdsc->sessions[i]) { 3670 session = get_session(mdsc->sessions[i]); 3671 __unregister_session(mdsc, session); 3672 mutex_unlock(&mdsc->mutex); 3673 mutex_lock(&session->s_mutex); 3674 remove_session_caps(session); 3675 mutex_unlock(&session->s_mutex); 3676 ceph_put_mds_session(session); 3677 mutex_lock(&mdsc->mutex); 3678 } 3679 } 3680 WARN_ON(!list_empty(&mdsc->cap_delay_list)); 3681 mutex_unlock(&mdsc->mutex); 3682 3683 ceph_cleanup_empty_realms(mdsc); 3684 3685 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ 3686 3687 dout("stopped\n"); 3688 } 3689 3690 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) 3691 { 3692 struct ceph_mds_session *session; 3693 int mds; 3694 3695 dout("force umount\n"); 3696 3697 mutex_lock(&mdsc->mutex); 3698 for (mds = 0; mds < mdsc->max_sessions; mds++) { 3699 session = __ceph_lookup_mds_session(mdsc, mds); 3700 if (!session) 3701 continue; 3702 mutex_unlock(&mdsc->mutex); 3703 mutex_lock(&session->s_mutex); 3704 __close_session(mdsc, session); 3705 if (session->s_state == CEPH_MDS_SESSION_CLOSING) { 3706 cleanup_session_requests(mdsc, session); 3707 remove_session_caps(session); 3708 } 3709 mutex_unlock(&session->s_mutex); 3710 ceph_put_mds_session(session); 3711 mutex_lock(&mdsc->mutex); 3712 kick_requests(mdsc, mds); 3713 } 3714 __wake_requests(mdsc, &mdsc->waiting_for_map); 3715 mutex_unlock(&mdsc->mutex); 3716 } 3717 3718 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) 3719 { 3720 dout("stop\n"); 3721 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ 3722 if (mdsc->mdsmap) 3723 ceph_mdsmap_destroy(mdsc->mdsmap); 3724 kfree(mdsc->sessions); 3725 ceph_caps_finalize(mdsc); 3726 ceph_pool_perm_destroy(mdsc); 3727 } 3728 3729 void ceph_mdsc_destroy(struct ceph_fs_client *fsc) 3730 { 3731 struct ceph_mds_client *mdsc = fsc->mdsc; 3732 3733 dout("mdsc_destroy %p\n", mdsc); 3734 ceph_mdsc_stop(mdsc); 3735 3736 /* flush out any connection work with references to us */ 3737 ceph_msgr_flush(); 3738 3739 fsc->mdsc = NULL; 3740 kfree(mdsc); 3741 dout("mdsc_destroy %p done\n", mdsc); 3742 } 3743 3744 3745 /* 3746 * handle mds map update. 3747 */ 3748 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) 3749 { 3750 u32 epoch; 3751 u32 maplen; 3752 void *p = msg->front.iov_base; 3753 void *end = p + msg->front.iov_len; 3754 struct ceph_mdsmap *newmap, *oldmap; 3755 struct ceph_fsid fsid; 3756 int err = -EINVAL; 3757 3758 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); 3759 ceph_decode_copy(&p, &fsid, sizeof(fsid)); 3760 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) 3761 return; 3762 epoch = ceph_decode_32(&p); 3763 maplen = ceph_decode_32(&p); 3764 dout("handle_map epoch %u len %d\n", epoch, (int)maplen); 3765 3766 /* do we need it? */ 3767 mutex_lock(&mdsc->mutex); 3768 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { 3769 dout("handle_map epoch %u <= our %u\n", 3770 epoch, mdsc->mdsmap->m_epoch); 3771 mutex_unlock(&mdsc->mutex); 3772 return; 3773 } 3774 3775 newmap = ceph_mdsmap_decode(&p, end); 3776 if (IS_ERR(newmap)) { 3777 err = PTR_ERR(newmap); 3778 goto bad_unlock; 3779 } 3780 3781 /* swap into place */ 3782 if (mdsc->mdsmap) { 3783 oldmap = mdsc->mdsmap; 3784 mdsc->mdsmap = newmap; 3785 check_new_map(mdsc, newmap, oldmap); 3786 ceph_mdsmap_destroy(oldmap); 3787 } else { 3788 mdsc->mdsmap = newmap; /* first mds map */ 3789 } 3790 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; 3791 3792 __wake_requests(mdsc, &mdsc->waiting_for_map); 3793 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, 3794 mdsc->mdsmap->m_epoch); 3795 3796 mutex_unlock(&mdsc->mutex); 3797 schedule_delayed(mdsc); 3798 return; 3799 3800 bad_unlock: 3801 mutex_unlock(&mdsc->mutex); 3802 bad: 3803 pr_err("error decoding mdsmap %d\n", err); 3804 return; 3805 } 3806 3807 static struct ceph_connection *con_get(struct ceph_connection *con) 3808 { 3809 struct ceph_mds_session *s = con->private; 3810 3811 if (get_session(s)) { 3812 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); 3813 return con; 3814 } 3815 dout("mdsc con_get %p FAIL\n", s); 3816 return NULL; 3817 } 3818 3819 static void con_put(struct ceph_connection *con) 3820 { 3821 struct ceph_mds_session *s = con->private; 3822 3823 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); 3824 ceph_put_mds_session(s); 3825 } 3826 3827 /* 3828 * if the client is unresponsive for long enough, the mds will kill 3829 * the session entirely. 3830 */ 3831 static void peer_reset(struct ceph_connection *con) 3832 { 3833 struct ceph_mds_session *s = con->private; 3834 struct ceph_mds_client *mdsc = s->s_mdsc; 3835 3836 pr_warn("mds%d closed our session\n", s->s_mds); 3837 send_mds_reconnect(mdsc, s); 3838 } 3839 3840 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) 3841 { 3842 struct ceph_mds_session *s = con->private; 3843 struct ceph_mds_client *mdsc = s->s_mdsc; 3844 int type = le16_to_cpu(msg->hdr.type); 3845 3846 mutex_lock(&mdsc->mutex); 3847 if (__verify_registered_session(mdsc, s) < 0) { 3848 mutex_unlock(&mdsc->mutex); 3849 goto out; 3850 } 3851 mutex_unlock(&mdsc->mutex); 3852 3853 switch (type) { 3854 case CEPH_MSG_MDS_MAP: 3855 ceph_mdsc_handle_map(mdsc, msg); 3856 break; 3857 case CEPH_MSG_CLIENT_SESSION: 3858 handle_session(s, msg); 3859 break; 3860 case CEPH_MSG_CLIENT_REPLY: 3861 handle_reply(s, msg); 3862 break; 3863 case CEPH_MSG_CLIENT_REQUEST_FORWARD: 3864 handle_forward(mdsc, s, msg); 3865 break; 3866 case CEPH_MSG_CLIENT_CAPS: 3867 ceph_handle_caps(s, msg); 3868 break; 3869 case CEPH_MSG_CLIENT_SNAP: 3870 ceph_handle_snap(mdsc, s, msg); 3871 break; 3872 case CEPH_MSG_CLIENT_LEASE: 3873 handle_lease(mdsc, s, msg); 3874 break; 3875 3876 default: 3877 pr_err("received unknown message type %d %s\n", type, 3878 ceph_msg_type_name(type)); 3879 } 3880 out: 3881 ceph_msg_put(msg); 3882 } 3883 3884 /* 3885 * authentication 3886 */ 3887 3888 /* 3889 * Note: returned pointer is the address of a structure that's 3890 * managed separately. Caller must *not* attempt to free it. 3891 */ 3892 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, 3893 int *proto, int force_new) 3894 { 3895 struct ceph_mds_session *s = con->private; 3896 struct ceph_mds_client *mdsc = s->s_mdsc; 3897 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 3898 struct ceph_auth_handshake *auth = &s->s_auth; 3899 3900 if (force_new && auth->authorizer) { 3901 ceph_auth_destroy_authorizer(auth->authorizer); 3902 auth->authorizer = NULL; 3903 } 3904 if (!auth->authorizer) { 3905 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, 3906 auth); 3907 if (ret) 3908 return ERR_PTR(ret); 3909 } else { 3910 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, 3911 auth); 3912 if (ret) 3913 return ERR_PTR(ret); 3914 } 3915 *proto = ac->protocol; 3916 3917 return auth; 3918 } 3919 3920 3921 static int verify_authorizer_reply(struct ceph_connection *con, int len) 3922 { 3923 struct ceph_mds_session *s = con->private; 3924 struct ceph_mds_client *mdsc = s->s_mdsc; 3925 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 3926 3927 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); 3928 } 3929 3930 static int invalidate_authorizer(struct ceph_connection *con) 3931 { 3932 struct ceph_mds_session *s = con->private; 3933 struct ceph_mds_client *mdsc = s->s_mdsc; 3934 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 3935 3936 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); 3937 3938 return ceph_monc_validate_auth(&mdsc->fsc->client->monc); 3939 } 3940 3941 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, 3942 struct ceph_msg_header *hdr, int *skip) 3943 { 3944 struct ceph_msg *msg; 3945 int type = (int) le16_to_cpu(hdr->type); 3946 int front_len = (int) le32_to_cpu(hdr->front_len); 3947 3948 if (con->in_msg) 3949 return con->in_msg; 3950 3951 *skip = 0; 3952 msg = ceph_msg_new(type, front_len, GFP_NOFS, false); 3953 if (!msg) { 3954 pr_err("unable to allocate msg type %d len %d\n", 3955 type, front_len); 3956 return NULL; 3957 } 3958 3959 return msg; 3960 } 3961 3962 static int mds_sign_message(struct ceph_msg *msg) 3963 { 3964 struct ceph_mds_session *s = msg->con->private; 3965 struct ceph_auth_handshake *auth = &s->s_auth; 3966 3967 return ceph_auth_sign_message(auth, msg); 3968 } 3969 3970 static int mds_check_message_signature(struct ceph_msg *msg) 3971 { 3972 struct ceph_mds_session *s = msg->con->private; 3973 struct ceph_auth_handshake *auth = &s->s_auth; 3974 3975 return ceph_auth_check_message_signature(auth, msg); 3976 } 3977 3978 static const struct ceph_connection_operations mds_con_ops = { 3979 .get = con_get, 3980 .put = con_put, 3981 .dispatch = dispatch, 3982 .get_authorizer = get_authorizer, 3983 .verify_authorizer_reply = verify_authorizer_reply, 3984 .invalidate_authorizer = invalidate_authorizer, 3985 .peer_reset = peer_reset, 3986 .alloc_msg = mds_alloc_msg, 3987 .sign_message = mds_sign_message, 3988 .check_message_signature = mds_check_message_signature, 3989 }; 3990 3991 /* eof */ 3992