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 If 40 * the session times out and goes stale, our leases and capabilities 41 * are no longer valid. 42 */ 43 44 struct ceph_reconnect_state { 45 struct ceph_pagelist *pagelist; 46 bool flock; 47 }; 48 49 static void __wake_requests(struct ceph_mds_client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