1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/fs.h> 5 #include <linux/wait.h> 6 #include <linux/slab.h> 7 #include <linux/gfp.h> 8 #include <linux/sched.h> 9 #include <linux/debugfs.h> 10 #include <linux/seq_file.h> 11 #include <linux/ratelimit.h> 12 #include <linux/bits.h> 13 #include <linux/ktime.h> 14 #include <linux/bitmap.h> 15 16 #include "super.h" 17 #include "mds_client.h" 18 19 #include <linux/ceph/ceph_features.h> 20 #include <linux/ceph/messenger.h> 21 #include <linux/ceph/decode.h> 22 #include <linux/ceph/pagelist.h> 23 #include <linux/ceph/auth.h> 24 #include <linux/ceph/debugfs.h> 25 26 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE) 27 28 /* 29 * A cluster of MDS (metadata server) daemons is responsible for 30 * managing the file system namespace (the directory hierarchy and 31 * inodes) and for coordinating shared access to storage. Metadata is 32 * partitioning hierarchically across a number of servers, and that 33 * partition varies over time as the cluster adjusts the distribution 34 * in order to balance load. 35 * 36 * The MDS client is primarily responsible to managing synchronous 37 * metadata requests for operations like open, unlink, and so forth. 38 * If there is a MDS failure, we find out about it when we (possibly 39 * request and) receive a new MDS map, and can resubmit affected 40 * requests. 41 * 42 * For the most part, though, we take advantage of a lossless 43 * communications channel to the MDS, and do not need to worry about 44 * timing out or resubmitting requests. 45 * 46 * We maintain a stateful "session" with each MDS we interact with. 47 * Within each session, we sent periodic heartbeat messages to ensure 48 * any capabilities or leases we have been issues remain valid. If 49 * the session times out and goes stale, our leases and capabilities 50 * are no longer valid. 51 */ 52 53 struct ceph_reconnect_state { 54 struct ceph_mds_session *session; 55 int nr_caps, nr_realms; 56 struct ceph_pagelist *pagelist; 57 unsigned msg_version; 58 bool allow_multi; 59 }; 60 61 static void __wake_requests(struct ceph_mds_client *mdsc, 62 struct list_head *head); 63 static void ceph_cap_release_work(struct work_struct *work); 64 static void ceph_cap_reclaim_work(struct work_struct *work); 65 66 static const struct ceph_connection_operations mds_con_ops; 67 68 69 /* 70 * mds reply parsing 71 */ 72 73 static int parse_reply_info_quota(void **p, void *end, 74 struct ceph_mds_reply_info_in *info) 75 { 76 u8 struct_v, struct_compat; 77 u32 struct_len; 78 79 ceph_decode_8_safe(p, end, struct_v, bad); 80 ceph_decode_8_safe(p, end, struct_compat, bad); 81 /* struct_v is expected to be >= 1. we only 82 * understand encoding with struct_compat == 1. */ 83 if (!struct_v || struct_compat != 1) 84 goto bad; 85 ceph_decode_32_safe(p, end, struct_len, bad); 86 ceph_decode_need(p, end, struct_len, bad); 87 end = *p + struct_len; 88 ceph_decode_64_safe(p, end, info->max_bytes, bad); 89 ceph_decode_64_safe(p, end, info->max_files, bad); 90 *p = end; 91 return 0; 92 bad: 93 return -EIO; 94 } 95 96 /* 97 * parse individual inode info 98 */ 99 static int parse_reply_info_in(void **p, void *end, 100 struct ceph_mds_reply_info_in *info, 101 u64 features) 102 { 103 int err = 0; 104 u8 struct_v = 0; 105 106 if (features == (u64)-1) { 107 u32 struct_len; 108 u8 struct_compat; 109 ceph_decode_8_safe(p, end, struct_v, bad); 110 ceph_decode_8_safe(p, end, struct_compat, bad); 111 /* struct_v is expected to be >= 1. we only understand 112 * encoding with struct_compat == 1. */ 113 if (!struct_v || struct_compat != 1) 114 goto bad; 115 ceph_decode_32_safe(p, end, struct_len, bad); 116 ceph_decode_need(p, end, struct_len, bad); 117 end = *p + struct_len; 118 } 119 120 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad); 121 info->in = *p; 122 *p += sizeof(struct ceph_mds_reply_inode) + 123 sizeof(*info->in->fragtree.splits) * 124 le32_to_cpu(info->in->fragtree.nsplits); 125 126 ceph_decode_32_safe(p, end, info->symlink_len, bad); 127 ceph_decode_need(p, end, info->symlink_len, bad); 128 info->symlink = *p; 129 *p += info->symlink_len; 130 131 ceph_decode_copy_safe(p, end, &info->dir_layout, 132 sizeof(info->dir_layout), bad); 133 ceph_decode_32_safe(p, end, info->xattr_len, bad); 134 ceph_decode_need(p, end, info->xattr_len, bad); 135 info->xattr_data = *p; 136 *p += info->xattr_len; 137 138 if (features == (u64)-1) { 139 /* inline data */ 140 ceph_decode_64_safe(p, end, info->inline_version, bad); 141 ceph_decode_32_safe(p, end, info->inline_len, bad); 142 ceph_decode_need(p, end, info->inline_len, bad); 143 info->inline_data = *p; 144 *p += info->inline_len; 145 /* quota */ 146 err = parse_reply_info_quota(p, end, info); 147 if (err < 0) 148 goto out_bad; 149 /* pool namespace */ 150 ceph_decode_32_safe(p, end, info->pool_ns_len, bad); 151 if (info->pool_ns_len > 0) { 152 ceph_decode_need(p, end, info->pool_ns_len, bad); 153 info->pool_ns_data = *p; 154 *p += info->pool_ns_len; 155 } 156 157 /* btime */ 158 ceph_decode_need(p, end, sizeof(info->btime), bad); 159 ceph_decode_copy(p, &info->btime, sizeof(info->btime)); 160 161 /* change attribute */ 162 ceph_decode_64_safe(p, end, info->change_attr, bad); 163 164 /* dir pin */ 165 if (struct_v >= 2) { 166 ceph_decode_32_safe(p, end, info->dir_pin, bad); 167 } else { 168 info->dir_pin = -ENODATA; 169 } 170 171 /* snapshot birth time, remains zero for v<=2 */ 172 if (struct_v >= 3) { 173 ceph_decode_need(p, end, sizeof(info->snap_btime), bad); 174 ceph_decode_copy(p, &info->snap_btime, 175 sizeof(info->snap_btime)); 176 } else { 177 memset(&info->snap_btime, 0, sizeof(info->snap_btime)); 178 } 179 180 /* snapshot count, remains zero for v<=3 */ 181 if (struct_v >= 4) { 182 ceph_decode_64_safe(p, end, info->rsnaps, bad); 183 } else { 184 info->rsnaps = 0; 185 } 186 187 *p = end; 188 } else { 189 if (features & CEPH_FEATURE_MDS_INLINE_DATA) { 190 ceph_decode_64_safe(p, end, info->inline_version, bad); 191 ceph_decode_32_safe(p, end, info->inline_len, bad); 192 ceph_decode_need(p, end, info->inline_len, bad); 193 info->inline_data = *p; 194 *p += info->inline_len; 195 } else 196 info->inline_version = CEPH_INLINE_NONE; 197 198 if (features & CEPH_FEATURE_MDS_QUOTA) { 199 err = parse_reply_info_quota(p, end, info); 200 if (err < 0) 201 goto out_bad; 202 } else { 203 info->max_bytes = 0; 204 info->max_files = 0; 205 } 206 207 info->pool_ns_len = 0; 208 info->pool_ns_data = NULL; 209 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { 210 ceph_decode_32_safe(p, end, info->pool_ns_len, bad); 211 if (info->pool_ns_len > 0) { 212 ceph_decode_need(p, end, info->pool_ns_len, bad); 213 info->pool_ns_data = *p; 214 *p += info->pool_ns_len; 215 } 216 } 217 218 if (features & CEPH_FEATURE_FS_BTIME) { 219 ceph_decode_need(p, end, sizeof(info->btime), bad); 220 ceph_decode_copy(p, &info->btime, sizeof(info->btime)); 221 ceph_decode_64_safe(p, end, info->change_attr, bad); 222 } 223 224 info->dir_pin = -ENODATA; 225 /* info->snap_btime and info->rsnaps remain zero */ 226 } 227 return 0; 228 bad: 229 err = -EIO; 230 out_bad: 231 return err; 232 } 233 234 static int parse_reply_info_dir(void **p, void *end, 235 struct ceph_mds_reply_dirfrag **dirfrag, 236 u64 features) 237 { 238 if (features == (u64)-1) { 239 u8 struct_v, struct_compat; 240 u32 struct_len; 241 ceph_decode_8_safe(p, end, struct_v, bad); 242 ceph_decode_8_safe(p, end, struct_compat, bad); 243 /* struct_v is expected to be >= 1. we only understand 244 * encoding whose struct_compat == 1. */ 245 if (!struct_v || struct_compat != 1) 246 goto bad; 247 ceph_decode_32_safe(p, end, struct_len, bad); 248 ceph_decode_need(p, end, struct_len, bad); 249 end = *p + struct_len; 250 } 251 252 ceph_decode_need(p, end, sizeof(**dirfrag), bad); 253 *dirfrag = *p; 254 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist); 255 if (unlikely(*p > end)) 256 goto bad; 257 if (features == (u64)-1) 258 *p = end; 259 return 0; 260 bad: 261 return -EIO; 262 } 263 264 static int parse_reply_info_lease(void **p, void *end, 265 struct ceph_mds_reply_lease **lease, 266 u64 features) 267 { 268 if (features == (u64)-1) { 269 u8 struct_v, struct_compat; 270 u32 struct_len; 271 ceph_decode_8_safe(p, end, struct_v, bad); 272 ceph_decode_8_safe(p, end, struct_compat, bad); 273 /* struct_v is expected to be >= 1. we only understand 274 * encoding whose struct_compat == 1. */ 275 if (!struct_v || struct_compat != 1) 276 goto bad; 277 ceph_decode_32_safe(p, end, struct_len, bad); 278 ceph_decode_need(p, end, struct_len, bad); 279 end = *p + struct_len; 280 } 281 282 ceph_decode_need(p, end, sizeof(**lease), bad); 283 *lease = *p; 284 *p += sizeof(**lease); 285 if (features == (u64)-1) 286 *p = end; 287 return 0; 288 bad: 289 return -EIO; 290 } 291 292 /* 293 * parse a normal reply, which may contain a (dir+)dentry and/or a 294 * target inode. 295 */ 296 static int parse_reply_info_trace(void **p, void *end, 297 struct ceph_mds_reply_info_parsed *info, 298 u64 features) 299 { 300 int err; 301 302 if (info->head->is_dentry) { 303 err = parse_reply_info_in(p, end, &info->diri, features); 304 if (err < 0) 305 goto out_bad; 306 307 err = parse_reply_info_dir(p, end, &info->dirfrag, features); 308 if (err < 0) 309 goto out_bad; 310 311 ceph_decode_32_safe(p, end, info->dname_len, bad); 312 ceph_decode_need(p, end, info->dname_len, bad); 313 info->dname = *p; 314 *p += info->dname_len; 315 316 err = parse_reply_info_lease(p, end, &info->dlease, features); 317 if (err < 0) 318 goto out_bad; 319 } 320 321 if (info->head->is_target) { 322 err = parse_reply_info_in(p, end, &info->targeti, features); 323 if (err < 0) 324 goto out_bad; 325 } 326 327 if (unlikely(*p != end)) 328 goto bad; 329 return 0; 330 331 bad: 332 err = -EIO; 333 out_bad: 334 pr_err("problem parsing mds trace %d\n", err); 335 return err; 336 } 337 338 /* 339 * parse readdir results 340 */ 341 static int parse_reply_info_readdir(void **p, void *end, 342 struct ceph_mds_reply_info_parsed *info, 343 u64 features) 344 { 345 u32 num, i = 0; 346 int err; 347 348 err = parse_reply_info_dir(p, end, &info->dir_dir, features); 349 if (err < 0) 350 goto out_bad; 351 352 ceph_decode_need(p, end, sizeof(num) + 2, bad); 353 num = ceph_decode_32(p); 354 { 355 u16 flags = ceph_decode_16(p); 356 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END); 357 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE); 358 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER); 359 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH); 360 } 361 if (num == 0) 362 goto done; 363 364 BUG_ON(!info->dir_entries); 365 if ((unsigned long)(info->dir_entries + num) > 366 (unsigned long)info->dir_entries + info->dir_buf_size) { 367 pr_err("dir contents are larger than expected\n"); 368 WARN_ON(1); 369 goto bad; 370 } 371 372 info->dir_nr = num; 373 while (num) { 374 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; 375 /* dentry */ 376 ceph_decode_32_safe(p, end, rde->name_len, bad); 377 ceph_decode_need(p, end, rde->name_len, bad); 378 rde->name = *p; 379 *p += rde->name_len; 380 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); 381 382 /* dentry lease */ 383 err = parse_reply_info_lease(p, end, &rde->lease, features); 384 if (err) 385 goto out_bad; 386 /* inode */ 387 err = parse_reply_info_in(p, end, &rde->inode, features); 388 if (err < 0) 389 goto out_bad; 390 /* ceph_readdir_prepopulate() will update it */ 391 rde->offset = 0; 392 i++; 393 num--; 394 } 395 396 done: 397 /* Skip over any unrecognized fields */ 398 *p = end; 399 return 0; 400 401 bad: 402 err = -EIO; 403 out_bad: 404 pr_err("problem parsing dir contents %d\n", err); 405 return err; 406 } 407 408 /* 409 * parse fcntl F_GETLK results 410 */ 411 static int parse_reply_info_filelock(void **p, void *end, 412 struct ceph_mds_reply_info_parsed *info, 413 u64 features) 414 { 415 if (*p + sizeof(*info->filelock_reply) > end) 416 goto bad; 417 418 info->filelock_reply = *p; 419 420 /* Skip over any unrecognized fields */ 421 *p = end; 422 return 0; 423 bad: 424 return -EIO; 425 } 426 427 428 #if BITS_PER_LONG == 64 429 430 #define DELEGATED_INO_AVAILABLE xa_mk_value(1) 431 432 static int ceph_parse_deleg_inos(void **p, void *end, 433 struct ceph_mds_session *s) 434 { 435 u32 sets; 436 437 ceph_decode_32_safe(p, end, sets, bad); 438 dout("got %u sets of delegated inodes\n", sets); 439 while (sets--) { 440 u64 start, len, ino; 441 442 ceph_decode_64_safe(p, end, start, bad); 443 ceph_decode_64_safe(p, end, len, bad); 444 445 /* Don't accept a delegation of system inodes */ 446 if (start < CEPH_INO_SYSTEM_BASE) { 447 pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n", 448 start, len); 449 continue; 450 } 451 while (len--) { 452 int err = xa_insert(&s->s_delegated_inos, ino = start++, 453 DELEGATED_INO_AVAILABLE, 454 GFP_KERNEL); 455 if (!err) { 456 dout("added delegated inode 0x%llx\n", 457 start - 1); 458 } else if (err == -EBUSY) { 459 pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n", 460 start - 1); 461 } else { 462 return err; 463 } 464 } 465 } 466 return 0; 467 bad: 468 return -EIO; 469 } 470 471 u64 ceph_get_deleg_ino(struct ceph_mds_session *s) 472 { 473 unsigned long ino; 474 void *val; 475 476 xa_for_each(&s->s_delegated_inos, ino, val) { 477 val = xa_erase(&s->s_delegated_inos, ino); 478 if (val == DELEGATED_INO_AVAILABLE) 479 return ino; 480 } 481 return 0; 482 } 483 484 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) 485 { 486 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE, 487 GFP_KERNEL); 488 } 489 #else /* BITS_PER_LONG == 64 */ 490 /* 491 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just 492 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top 493 * and bottom words? 494 */ 495 static int ceph_parse_deleg_inos(void **p, void *end, 496 struct ceph_mds_session *s) 497 { 498 u32 sets; 499 500 ceph_decode_32_safe(p, end, sets, bad); 501 if (sets) 502 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad); 503 return 0; 504 bad: 505 return -EIO; 506 } 507 508 u64 ceph_get_deleg_ino(struct ceph_mds_session *s) 509 { 510 return 0; 511 } 512 513 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) 514 { 515 return 0; 516 } 517 #endif /* BITS_PER_LONG == 64 */ 518 519 /* 520 * parse create results 521 */ 522 static int parse_reply_info_create(void **p, void *end, 523 struct ceph_mds_reply_info_parsed *info, 524 u64 features, struct ceph_mds_session *s) 525 { 526 int ret; 527 528 if (features == (u64)-1 || 529 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) { 530 if (*p == end) { 531 /* Malformed reply? */ 532 info->has_create_ino = false; 533 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) { 534 info->has_create_ino = true; 535 /* struct_v, struct_compat, and len */ 536 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad); 537 ceph_decode_64_safe(p, end, info->ino, bad); 538 ret = ceph_parse_deleg_inos(p, end, s); 539 if (ret) 540 return ret; 541 } else { 542 /* legacy */ 543 ceph_decode_64_safe(p, end, info->ino, bad); 544 info->has_create_ino = true; 545 } 546 } else { 547 if (*p != end) 548 goto bad; 549 } 550 551 /* Skip over any unrecognized fields */ 552 *p = end; 553 return 0; 554 bad: 555 return -EIO; 556 } 557 558 /* 559 * parse extra results 560 */ 561 static int parse_reply_info_extra(void **p, void *end, 562 struct ceph_mds_reply_info_parsed *info, 563 u64 features, struct ceph_mds_session *s) 564 { 565 u32 op = le32_to_cpu(info->head->op); 566 567 if (op == CEPH_MDS_OP_GETFILELOCK) 568 return parse_reply_info_filelock(p, end, info, features); 569 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP) 570 return parse_reply_info_readdir(p, end, info, features); 571 else if (op == CEPH_MDS_OP_CREATE) 572 return parse_reply_info_create(p, end, info, features, s); 573 else 574 return -EIO; 575 } 576 577 /* 578 * parse entire mds reply 579 */ 580 static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg, 581 struct ceph_mds_reply_info_parsed *info, 582 u64 features) 583 { 584 void *p, *end; 585 u32 len; 586 int err; 587 588 info->head = msg->front.iov_base; 589 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); 590 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); 591 592 /* trace */ 593 ceph_decode_32_safe(&p, end, len, bad); 594 if (len > 0) { 595 ceph_decode_need(&p, end, len, bad); 596 err = parse_reply_info_trace(&p, p+len, info, features); 597 if (err < 0) 598 goto out_bad; 599 } 600 601 /* extra */ 602 ceph_decode_32_safe(&p, end, len, bad); 603 if (len > 0) { 604 ceph_decode_need(&p, end, len, bad); 605 err = parse_reply_info_extra(&p, p+len, info, features, s); 606 if (err < 0) 607 goto out_bad; 608 } 609 610 /* snap blob */ 611 ceph_decode_32_safe(&p, end, len, bad); 612 info->snapblob_len = len; 613 info->snapblob = p; 614 p += len; 615 616 if (p != end) 617 goto bad; 618 return 0; 619 620 bad: 621 err = -EIO; 622 out_bad: 623 pr_err("mds parse_reply err %d\n", err); 624 return err; 625 } 626 627 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) 628 { 629 if (!info->dir_entries) 630 return; 631 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size)); 632 } 633 634 635 /* 636 * sessions 637 */ 638 const char *ceph_session_state_name(int s) 639 { 640 switch (s) { 641 case CEPH_MDS_SESSION_NEW: return "new"; 642 case CEPH_MDS_SESSION_OPENING: return "opening"; 643 case CEPH_MDS_SESSION_OPEN: return "open"; 644 case CEPH_MDS_SESSION_HUNG: return "hung"; 645 case CEPH_MDS_SESSION_CLOSING: return "closing"; 646 case CEPH_MDS_SESSION_CLOSED: return "closed"; 647 case CEPH_MDS_SESSION_RESTARTING: return "restarting"; 648 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; 649 case CEPH_MDS_SESSION_REJECTED: return "rejected"; 650 default: return "???"; 651 } 652 } 653 654 struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s) 655 { 656 if (refcount_inc_not_zero(&s->s_ref)) 657 return s; 658 return NULL; 659 } 660 661 void ceph_put_mds_session(struct ceph_mds_session *s) 662 { 663 if (IS_ERR_OR_NULL(s)) 664 return; 665 666 if (refcount_dec_and_test(&s->s_ref)) { 667 if (s->s_auth.authorizer) 668 ceph_auth_destroy_authorizer(s->s_auth.authorizer); 669 WARN_ON(mutex_is_locked(&s->s_mutex)); 670 xa_destroy(&s->s_delegated_inos); 671 kfree(s); 672 } 673 } 674 675 /* 676 * called under mdsc->mutex 677 */ 678 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, 679 int mds) 680 { 681 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) 682 return NULL; 683 return ceph_get_mds_session(mdsc->sessions[mds]); 684 } 685 686 static bool __have_session(struct ceph_mds_client *mdsc, int mds) 687 { 688 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) 689 return false; 690 else 691 return true; 692 } 693 694 static int __verify_registered_session(struct ceph_mds_client *mdsc, 695 struct ceph_mds_session *s) 696 { 697 if (s->s_mds >= mdsc->max_sessions || 698 mdsc->sessions[s->s_mds] != s) 699 return -ENOENT; 700 return 0; 701 } 702 703 /* 704 * create+register a new session for given mds. 705 * called under mdsc->mutex. 706 */ 707 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, 708 int mds) 709 { 710 struct ceph_mds_session *s; 711 712 if (mds >= mdsc->mdsmap->possible_max_rank) 713 return ERR_PTR(-EINVAL); 714 715 s = kzalloc(sizeof(*s), GFP_NOFS); 716 if (!s) 717 return ERR_PTR(-ENOMEM); 718 719 if (mds >= mdsc->max_sessions) { 720 int newmax = 1 << get_count_order(mds + 1); 721 struct ceph_mds_session **sa; 722 723 dout("%s: realloc to %d\n", __func__, newmax); 724 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); 725 if (!sa) 726 goto fail_realloc; 727 if (mdsc->sessions) { 728 memcpy(sa, mdsc->sessions, 729 mdsc->max_sessions * sizeof(void *)); 730 kfree(mdsc->sessions); 731 } 732 mdsc->sessions = sa; 733 mdsc->max_sessions = newmax; 734 } 735 736 dout("%s: mds%d\n", __func__, mds); 737 s->s_mdsc = mdsc; 738 s->s_mds = mds; 739 s->s_state = CEPH_MDS_SESSION_NEW; 740 mutex_init(&s->s_mutex); 741 742 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); 743 744 atomic_set(&s->s_cap_gen, 1); 745 s->s_cap_ttl = jiffies - 1; 746 747 spin_lock_init(&s->s_cap_lock); 748 INIT_LIST_HEAD(&s->s_caps); 749 refcount_set(&s->s_ref, 1); 750 INIT_LIST_HEAD(&s->s_waiting); 751 INIT_LIST_HEAD(&s->s_unsafe); 752 xa_init(&s->s_delegated_inos); 753 INIT_LIST_HEAD(&s->s_cap_releases); 754 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work); 755 756 INIT_LIST_HEAD(&s->s_cap_dirty); 757 INIT_LIST_HEAD(&s->s_cap_flushing); 758 759 mdsc->sessions[mds] = s; 760 atomic_inc(&mdsc->num_sessions); 761 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */ 762 763 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, 764 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 765 766 return s; 767 768 fail_realloc: 769 kfree(s); 770 return ERR_PTR(-ENOMEM); 771 } 772 773 /* 774 * called under mdsc->mutex 775 */ 776 static void __unregister_session(struct ceph_mds_client *mdsc, 777 struct ceph_mds_session *s) 778 { 779 dout("__unregister_session mds%d %p\n", s->s_mds, s); 780 BUG_ON(mdsc->sessions[s->s_mds] != s); 781 mdsc->sessions[s->s_mds] = NULL; 782 ceph_con_close(&s->s_con); 783 ceph_put_mds_session(s); 784 atomic_dec(&mdsc->num_sessions); 785 } 786 787 /* 788 * drop session refs in request. 789 * 790 * should be last request ref, or hold mdsc->mutex 791 */ 792 static void put_request_session(struct ceph_mds_request *req) 793 { 794 if (req->r_session) { 795 ceph_put_mds_session(req->r_session); 796 req->r_session = NULL; 797 } 798 } 799 800 void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 801 void (*cb)(struct ceph_mds_session *), 802 bool check_state) 803 { 804 int mds; 805 806 mutex_lock(&mdsc->mutex); 807 for (mds = 0; mds < mdsc->max_sessions; ++mds) { 808 struct ceph_mds_session *s; 809 810 s = __ceph_lookup_mds_session(mdsc, mds); 811 if (!s) 812 continue; 813 814 if (check_state && !check_session_state(s)) { 815 ceph_put_mds_session(s); 816 continue; 817 } 818 819 mutex_unlock(&mdsc->mutex); 820 cb(s); 821 ceph_put_mds_session(s); 822 mutex_lock(&mdsc->mutex); 823 } 824 mutex_unlock(&mdsc->mutex); 825 } 826 827 void ceph_mdsc_release_request(struct kref *kref) 828 { 829 struct ceph_mds_request *req = container_of(kref, 830 struct ceph_mds_request, 831 r_kref); 832 ceph_mdsc_release_dir_caps_no_check(req); 833 destroy_reply_info(&req->r_reply_info); 834 if (req->r_request) 835 ceph_msg_put(req->r_request); 836 if (req->r_reply) 837 ceph_msg_put(req->r_reply); 838 if (req->r_inode) { 839 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 840 iput(req->r_inode); 841 } 842 if (req->r_parent) { 843 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN); 844 iput(req->r_parent); 845 } 846 iput(req->r_target_inode); 847 if (req->r_dentry) 848 dput(req->r_dentry); 849 if (req->r_old_dentry) 850 dput(req->r_old_dentry); 851 if (req->r_old_dentry_dir) { 852 /* 853 * track (and drop pins for) r_old_dentry_dir 854 * separately, since r_old_dentry's d_parent may have 855 * changed between the dir mutex being dropped and 856 * this request being freed. 857 */ 858 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), 859 CEPH_CAP_PIN); 860 iput(req->r_old_dentry_dir); 861 } 862 kfree(req->r_path1); 863 kfree(req->r_path2); 864 put_cred(req->r_cred); 865 if (req->r_pagelist) 866 ceph_pagelist_release(req->r_pagelist); 867 put_request_session(req); 868 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); 869 WARN_ON_ONCE(!list_empty(&req->r_wait)); 870 kmem_cache_free(ceph_mds_request_cachep, req); 871 } 872 873 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node) 874 875 /* 876 * lookup session, bump ref if found. 877 * 878 * called under mdsc->mutex. 879 */ 880 static struct ceph_mds_request * 881 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid) 882 { 883 struct ceph_mds_request *req; 884 885 req = lookup_request(&mdsc->request_tree, tid); 886 if (req) 887 ceph_mdsc_get_request(req); 888 889 return req; 890 } 891 892 /* 893 * Register an in-flight request, and assign a tid. Link to directory 894 * are modifying (if any). 895 * 896 * Called under mdsc->mutex. 897 */ 898 static void __register_request(struct ceph_mds_client *mdsc, 899 struct ceph_mds_request *req, 900 struct inode *dir) 901 { 902 int ret = 0; 903 904 req->r_tid = ++mdsc->last_tid; 905 if (req->r_num_caps) { 906 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation, 907 req->r_num_caps); 908 if (ret < 0) { 909 pr_err("__register_request %p " 910 "failed to reserve caps: %d\n", req, ret); 911 /* set req->r_err to fail early from __do_request */ 912 req->r_err = ret; 913 return; 914 } 915 } 916 dout("__register_request %p tid %lld\n", req, req->r_tid); 917 ceph_mdsc_get_request(req); 918 insert_request(&mdsc->request_tree, req); 919 920 req->r_cred = get_current_cred(); 921 922 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) 923 mdsc->oldest_tid = req->r_tid; 924 925 if (dir) { 926 struct ceph_inode_info *ci = ceph_inode(dir); 927 928 ihold(dir); 929 req->r_unsafe_dir = dir; 930 spin_lock(&ci->i_unsafe_lock); 931 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); 932 spin_unlock(&ci->i_unsafe_lock); 933 } 934 } 935 936 static void __unregister_request(struct ceph_mds_client *mdsc, 937 struct ceph_mds_request *req) 938 { 939 dout("__unregister_request %p tid %lld\n", req, req->r_tid); 940 941 /* Never leave an unregistered request on an unsafe list! */ 942 list_del_init(&req->r_unsafe_item); 943 944 if (req->r_tid == mdsc->oldest_tid) { 945 struct rb_node *p = rb_next(&req->r_node); 946 mdsc->oldest_tid = 0; 947 while (p) { 948 struct ceph_mds_request *next_req = 949 rb_entry(p, struct ceph_mds_request, r_node); 950 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { 951 mdsc->oldest_tid = next_req->r_tid; 952 break; 953 } 954 p = rb_next(p); 955 } 956 } 957 958 erase_request(&mdsc->request_tree, req); 959 960 if (req->r_unsafe_dir) { 961 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); 962 spin_lock(&ci->i_unsafe_lock); 963 list_del_init(&req->r_unsafe_dir_item); 964 spin_unlock(&ci->i_unsafe_lock); 965 } 966 if (req->r_target_inode && 967 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 968 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); 969 spin_lock(&ci->i_unsafe_lock); 970 list_del_init(&req->r_unsafe_target_item); 971 spin_unlock(&ci->i_unsafe_lock); 972 } 973 974 if (req->r_unsafe_dir) { 975 iput(req->r_unsafe_dir); 976 req->r_unsafe_dir = NULL; 977 } 978 979 complete_all(&req->r_safe_completion); 980 981 ceph_mdsc_put_request(req); 982 } 983 984 /* 985 * Walk back up the dentry tree until we hit a dentry representing a 986 * non-snapshot inode. We do this using the rcu_read_lock (which must be held 987 * when calling this) to ensure that the objects won't disappear while we're 988 * working with them. Once we hit a candidate dentry, we attempt to take a 989 * reference to it, and return that as the result. 990 */ 991 static struct inode *get_nonsnap_parent(struct dentry *dentry) 992 { 993 struct inode *inode = NULL; 994 995 while (dentry && !IS_ROOT(dentry)) { 996 inode = d_inode_rcu(dentry); 997 if (!inode || ceph_snap(inode) == CEPH_NOSNAP) 998 break; 999 dentry = dentry->d_parent; 1000 } 1001 if (inode) 1002 inode = igrab(inode); 1003 return inode; 1004 } 1005 1006 /* 1007 * Choose mds to send request to next. If there is a hint set in the 1008 * request (e.g., due to a prior forward hint from the mds), use that. 1009 * Otherwise, consult frag tree and/or caps to identify the 1010 * appropriate mds. If all else fails, choose randomly. 1011 * 1012 * Called under mdsc->mutex. 1013 */ 1014 static int __choose_mds(struct ceph_mds_client *mdsc, 1015 struct ceph_mds_request *req, 1016 bool *random) 1017 { 1018 struct inode *inode; 1019 struct ceph_inode_info *ci; 1020 struct ceph_cap *cap; 1021 int mode = req->r_direct_mode; 1022 int mds = -1; 1023 u32 hash = req->r_direct_hash; 1024 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); 1025 1026 if (random) 1027 *random = false; 1028 1029 /* 1030 * is there a specific mds we should try? ignore hint if we have 1031 * no session and the mds is not up (active or recovering). 1032 */ 1033 if (req->r_resend_mds >= 0 && 1034 (__have_session(mdsc, req->r_resend_mds) || 1035 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { 1036 dout("%s using resend_mds mds%d\n", __func__, 1037 req->r_resend_mds); 1038 return req->r_resend_mds; 1039 } 1040 1041 if (mode == USE_RANDOM_MDS) 1042 goto random; 1043 1044 inode = NULL; 1045 if (req->r_inode) { 1046 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) { 1047 inode = req->r_inode; 1048 ihold(inode); 1049 } else { 1050 /* req->r_dentry is non-null for LSSNAP request */ 1051 rcu_read_lock(); 1052 inode = get_nonsnap_parent(req->r_dentry); 1053 rcu_read_unlock(); 1054 dout("%s using snapdir's parent %p\n", __func__, inode); 1055 } 1056 } else if (req->r_dentry) { 1057 /* ignore race with rename; old or new d_parent is okay */ 1058 struct dentry *parent; 1059 struct inode *dir; 1060 1061 rcu_read_lock(); 1062 parent = READ_ONCE(req->r_dentry->d_parent); 1063 dir = req->r_parent ? : d_inode_rcu(parent); 1064 1065 if (!dir || dir->i_sb != mdsc->fsc->sb) { 1066 /* not this fs or parent went negative */ 1067 inode = d_inode(req->r_dentry); 1068 if (inode) 1069 ihold(inode); 1070 } else if (ceph_snap(dir) != CEPH_NOSNAP) { 1071 /* direct snapped/virtual snapdir requests 1072 * based on parent dir inode */ 1073 inode = get_nonsnap_parent(parent); 1074 dout("%s using nonsnap parent %p\n", __func__, inode); 1075 } else { 1076 /* dentry target */ 1077 inode = d_inode(req->r_dentry); 1078 if (!inode || mode == USE_AUTH_MDS) { 1079 /* dir + name */ 1080 inode = igrab(dir); 1081 hash = ceph_dentry_hash(dir, req->r_dentry); 1082 is_hash = true; 1083 } else { 1084 ihold(inode); 1085 } 1086 } 1087 rcu_read_unlock(); 1088 } 1089 1090 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash, 1091 hash, mode); 1092 if (!inode) 1093 goto random; 1094 ci = ceph_inode(inode); 1095 1096 if (is_hash && S_ISDIR(inode->i_mode)) { 1097 struct ceph_inode_frag frag; 1098 int found; 1099 1100 ceph_choose_frag(ci, hash, &frag, &found); 1101 if (found) { 1102 if (mode == USE_ANY_MDS && frag.ndist > 0) { 1103 u8 r; 1104 1105 /* choose a random replica */ 1106 get_random_bytes(&r, 1); 1107 r %= frag.ndist; 1108 mds = frag.dist[r]; 1109 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n", 1110 __func__, inode, ceph_vinop(inode), 1111 frag.frag, mds, (int)r, frag.ndist); 1112 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 1113 CEPH_MDS_STATE_ACTIVE && 1114 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds)) 1115 goto out; 1116 } 1117 1118 /* since this file/dir wasn't known to be 1119 * replicated, then we want to look for the 1120 * authoritative mds. */ 1121 if (frag.mds >= 0) { 1122 /* choose auth mds */ 1123 mds = frag.mds; 1124 dout("%s %p %llx.%llx frag %u mds%d (auth)\n", 1125 __func__, inode, ceph_vinop(inode), 1126 frag.frag, mds); 1127 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 1128 CEPH_MDS_STATE_ACTIVE) { 1129 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap, 1130 mds)) 1131 goto out; 1132 } 1133 } 1134 mode = USE_AUTH_MDS; 1135 } 1136 } 1137 1138 spin_lock(&ci->i_ceph_lock); 1139 cap = NULL; 1140 if (mode == USE_AUTH_MDS) 1141 cap = ci->i_auth_cap; 1142 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) 1143 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); 1144 if (!cap) { 1145 spin_unlock(&ci->i_ceph_lock); 1146 iput(inode); 1147 goto random; 1148 } 1149 mds = cap->session->s_mds; 1150 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__, 1151 inode, ceph_vinop(inode), mds, 1152 cap == ci->i_auth_cap ? "auth " : "", cap); 1153 spin_unlock(&ci->i_ceph_lock); 1154 out: 1155 iput(inode); 1156 return mds; 1157 1158 random: 1159 if (random) 1160 *random = true; 1161 1162 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); 1163 dout("%s chose random mds%d\n", __func__, mds); 1164 return mds; 1165 } 1166 1167 1168 /* 1169 * session messages 1170 */ 1171 struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq) 1172 { 1173 struct ceph_msg *msg; 1174 struct ceph_mds_session_head *h; 1175 1176 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, 1177 false); 1178 if (!msg) { 1179 pr_err("ENOMEM creating session %s msg\n", 1180 ceph_session_op_name(op)); 1181 return NULL; 1182 } 1183 h = msg->front.iov_base; 1184 h->op = cpu_to_le32(op); 1185 h->seq = cpu_to_le64(seq); 1186 1187 return msg; 1188 } 1189 1190 static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED; 1191 #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8) 1192 static int encode_supported_features(void **p, void *end) 1193 { 1194 static const size_t count = ARRAY_SIZE(feature_bits); 1195 1196 if (count > 0) { 1197 size_t i; 1198 size_t size = FEATURE_BYTES(count); 1199 1200 if (WARN_ON_ONCE(*p + 4 + size > end)) 1201 return -ERANGE; 1202 1203 ceph_encode_32(p, size); 1204 memset(*p, 0, size); 1205 for (i = 0; i < count; i++) 1206 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8); 1207 *p += size; 1208 } else { 1209 if (WARN_ON_ONCE(*p + 4 > end)) 1210 return -ERANGE; 1211 1212 ceph_encode_32(p, 0); 1213 } 1214 1215 return 0; 1216 } 1217 1218 static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED; 1219 #define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8) 1220 static int encode_metric_spec(void **p, void *end) 1221 { 1222 static const size_t count = ARRAY_SIZE(metric_bits); 1223 1224 /* header */ 1225 if (WARN_ON_ONCE(*p + 2 > end)) 1226 return -ERANGE; 1227 1228 ceph_encode_8(p, 1); /* version */ 1229 ceph_encode_8(p, 1); /* compat */ 1230 1231 if (count > 0) { 1232 size_t i; 1233 size_t size = METRIC_BYTES(count); 1234 1235 if (WARN_ON_ONCE(*p + 4 + 4 + size > end)) 1236 return -ERANGE; 1237 1238 /* metric spec info length */ 1239 ceph_encode_32(p, 4 + size); 1240 1241 /* metric spec */ 1242 ceph_encode_32(p, size); 1243 memset(*p, 0, size); 1244 for (i = 0; i < count; i++) 1245 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8); 1246 *p += size; 1247 } else { 1248 if (WARN_ON_ONCE(*p + 4 + 4 > end)) 1249 return -ERANGE; 1250 1251 /* metric spec info length */ 1252 ceph_encode_32(p, 4); 1253 /* metric spec */ 1254 ceph_encode_32(p, 0); 1255 } 1256 1257 return 0; 1258 } 1259 1260 /* 1261 * session message, specialization for CEPH_SESSION_REQUEST_OPEN 1262 * to include additional client metadata fields. 1263 */ 1264 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) 1265 { 1266 struct ceph_msg *msg; 1267 struct ceph_mds_session_head *h; 1268 int i; 1269 int extra_bytes = 0; 1270 int metadata_key_count = 0; 1271 struct ceph_options *opt = mdsc->fsc->client->options; 1272 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options; 1273 size_t size, count; 1274 void *p, *end; 1275 int ret; 1276 1277 const char* metadata[][2] = { 1278 {"hostname", mdsc->nodename}, 1279 {"kernel_version", init_utsname()->release}, 1280 {"entity_id", opt->name ? : ""}, 1281 {"root", fsopt->server_path ? : "/"}, 1282 {NULL, NULL} 1283 }; 1284 1285 /* Calculate serialized length of metadata */ 1286 extra_bytes = 4; /* map length */ 1287 for (i = 0; metadata[i][0]; ++i) { 1288 extra_bytes += 8 + strlen(metadata[i][0]) + 1289 strlen(metadata[i][1]); 1290 metadata_key_count++; 1291 } 1292 1293 /* supported feature */ 1294 size = 0; 1295 count = ARRAY_SIZE(feature_bits); 1296 if (count > 0) 1297 size = FEATURE_BYTES(count); 1298 extra_bytes += 4 + size; 1299 1300 /* metric spec */ 1301 size = 0; 1302 count = ARRAY_SIZE(metric_bits); 1303 if (count > 0) 1304 size = METRIC_BYTES(count); 1305 extra_bytes += 2 + 4 + 4 + size; 1306 1307 /* Allocate the message */ 1308 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes, 1309 GFP_NOFS, false); 1310 if (!msg) { 1311 pr_err("ENOMEM creating session open msg\n"); 1312 return ERR_PTR(-ENOMEM); 1313 } 1314 p = msg->front.iov_base; 1315 end = p + msg->front.iov_len; 1316 1317 h = p; 1318 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); 1319 h->seq = cpu_to_le64(seq); 1320 1321 /* 1322 * Serialize client metadata into waiting buffer space, using 1323 * the format that userspace expects for map<string, string> 1324 * 1325 * ClientSession messages with metadata are v4 1326 */ 1327 msg->hdr.version = cpu_to_le16(4); 1328 msg->hdr.compat_version = cpu_to_le16(1); 1329 1330 /* The write pointer, following the session_head structure */ 1331 p += sizeof(*h); 1332 1333 /* Number of entries in the map */ 1334 ceph_encode_32(&p, metadata_key_count); 1335 1336 /* Two length-prefixed strings for each entry in the map */ 1337 for (i = 0; metadata[i][0]; ++i) { 1338 size_t const key_len = strlen(metadata[i][0]); 1339 size_t const val_len = strlen(metadata[i][1]); 1340 1341 ceph_encode_32(&p, key_len); 1342 memcpy(p, metadata[i][0], key_len); 1343 p += key_len; 1344 ceph_encode_32(&p, val_len); 1345 memcpy(p, metadata[i][1], val_len); 1346 p += val_len; 1347 } 1348 1349 ret = encode_supported_features(&p, end); 1350 if (ret) { 1351 pr_err("encode_supported_features failed!\n"); 1352 ceph_msg_put(msg); 1353 return ERR_PTR(ret); 1354 } 1355 1356 ret = encode_metric_spec(&p, end); 1357 if (ret) { 1358 pr_err("encode_metric_spec failed!\n"); 1359 ceph_msg_put(msg); 1360 return ERR_PTR(ret); 1361 } 1362 1363 msg->front.iov_len = p - msg->front.iov_base; 1364 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 1365 1366 return msg; 1367 } 1368 1369 /* 1370 * send session open request. 1371 * 1372 * called under mdsc->mutex 1373 */ 1374 static int __open_session(struct ceph_mds_client *mdsc, 1375 struct ceph_mds_session *session) 1376 { 1377 struct ceph_msg *msg; 1378 int mstate; 1379 int mds = session->s_mds; 1380 1381 /* wait for mds to go active? */ 1382 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); 1383 dout("open_session to mds%d (%s)\n", mds, 1384 ceph_mds_state_name(mstate)); 1385 session->s_state = CEPH_MDS_SESSION_OPENING; 1386 session->s_renew_requested = jiffies; 1387 1388 /* send connect message */ 1389 msg = create_session_open_msg(mdsc, session->s_seq); 1390 if (IS_ERR(msg)) 1391 return PTR_ERR(msg); 1392 ceph_con_send(&session->s_con, msg); 1393 return 0; 1394 } 1395 1396 /* 1397 * open sessions for any export targets for the given mds 1398 * 1399 * called under mdsc->mutex 1400 */ 1401 static struct ceph_mds_session * 1402 __open_export_target_session(struct ceph_mds_client *mdsc, int target) 1403 { 1404 struct ceph_mds_session *session; 1405 int ret; 1406 1407 session = __ceph_lookup_mds_session(mdsc, target); 1408 if (!session) { 1409 session = register_session(mdsc, target); 1410 if (IS_ERR(session)) 1411 return session; 1412 } 1413 if (session->s_state == CEPH_MDS_SESSION_NEW || 1414 session->s_state == CEPH_MDS_SESSION_CLOSING) { 1415 ret = __open_session(mdsc, session); 1416 if (ret) 1417 return ERR_PTR(ret); 1418 } 1419 1420 return session; 1421 } 1422 1423 struct ceph_mds_session * 1424 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) 1425 { 1426 struct ceph_mds_session *session; 1427 1428 dout("open_export_target_session to mds%d\n", target); 1429 1430 mutex_lock(&mdsc->mutex); 1431 session = __open_export_target_session(mdsc, target); 1432 mutex_unlock(&mdsc->mutex); 1433 1434 return session; 1435 } 1436 1437 static void __open_export_target_sessions(struct ceph_mds_client *mdsc, 1438 struct ceph_mds_session *session) 1439 { 1440 struct ceph_mds_info *mi; 1441 struct ceph_mds_session *ts; 1442 int i, mds = session->s_mds; 1443 1444 if (mds >= mdsc->mdsmap->possible_max_rank) 1445 return; 1446 1447 mi = &mdsc->mdsmap->m_info[mds]; 1448 dout("open_export_target_sessions for mds%d (%d targets)\n", 1449 session->s_mds, mi->num_export_targets); 1450 1451 for (i = 0; i < mi->num_export_targets; i++) { 1452 ts = __open_export_target_session(mdsc, mi->export_targets[i]); 1453 ceph_put_mds_session(ts); 1454 } 1455 } 1456 1457 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, 1458 struct ceph_mds_session *session) 1459 { 1460 mutex_lock(&mdsc->mutex); 1461 __open_export_target_sessions(mdsc, session); 1462 mutex_unlock(&mdsc->mutex); 1463 } 1464 1465 /* 1466 * session caps 1467 */ 1468 1469 static void detach_cap_releases(struct ceph_mds_session *session, 1470 struct list_head *target) 1471 { 1472 lockdep_assert_held(&session->s_cap_lock); 1473 1474 list_splice_init(&session->s_cap_releases, target); 1475 session->s_num_cap_releases = 0; 1476 dout("dispose_cap_releases mds%d\n", session->s_mds); 1477 } 1478 1479 static void dispose_cap_releases(struct ceph_mds_client *mdsc, 1480 struct list_head *dispose) 1481 { 1482 while (!list_empty(dispose)) { 1483 struct ceph_cap *cap; 1484 /* zero out the in-progress message */ 1485 cap = list_first_entry(dispose, struct ceph_cap, session_caps); 1486 list_del(&cap->session_caps); 1487 ceph_put_cap(mdsc, cap); 1488 } 1489 } 1490 1491 static void cleanup_session_requests(struct ceph_mds_client *mdsc, 1492 struct ceph_mds_session *session) 1493 { 1494 struct ceph_mds_request *req; 1495 struct rb_node *p; 1496 1497 dout("cleanup_session_requests mds%d\n", session->s_mds); 1498 mutex_lock(&mdsc->mutex); 1499 while (!list_empty(&session->s_unsafe)) { 1500 req = list_first_entry(&session->s_unsafe, 1501 struct ceph_mds_request, r_unsafe_item); 1502 pr_warn_ratelimited(" dropping unsafe request %llu\n", 1503 req->r_tid); 1504 if (req->r_target_inode) 1505 mapping_set_error(req->r_target_inode->i_mapping, -EIO); 1506 if (req->r_unsafe_dir) 1507 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO); 1508 __unregister_request(mdsc, req); 1509 } 1510 /* zero r_attempts, so kick_requests() will re-send requests */ 1511 p = rb_first(&mdsc->request_tree); 1512 while (p) { 1513 req = rb_entry(p, struct ceph_mds_request, r_node); 1514 p = rb_next(p); 1515 if (req->r_session && 1516 req->r_session->s_mds == session->s_mds) 1517 req->r_attempts = 0; 1518 } 1519 mutex_unlock(&mdsc->mutex); 1520 } 1521 1522 /* 1523 * Helper to safely iterate over all caps associated with a session, with 1524 * special care taken to handle a racing __ceph_remove_cap(). 1525 * 1526 * Caller must hold session s_mutex. 1527 */ 1528 int ceph_iterate_session_caps(struct ceph_mds_session *session, 1529 int (*cb)(struct inode *, struct ceph_cap *, 1530 void *), void *arg) 1531 { 1532 struct list_head *p; 1533 struct ceph_cap *cap; 1534 struct inode *inode, *last_inode = NULL; 1535 struct ceph_cap *old_cap = NULL; 1536 int ret; 1537 1538 dout("iterate_session_caps %p mds%d\n", session, session->s_mds); 1539 spin_lock(&session->s_cap_lock); 1540 p = session->s_caps.next; 1541 while (p != &session->s_caps) { 1542 cap = list_entry(p, struct ceph_cap, session_caps); 1543 inode = igrab(&cap->ci->vfs_inode); 1544 if (!inode) { 1545 p = p->next; 1546 continue; 1547 } 1548 session->s_cap_iterator = cap; 1549 spin_unlock(&session->s_cap_lock); 1550 1551 if (last_inode) { 1552 iput(last_inode); 1553 last_inode = NULL; 1554 } 1555 if (old_cap) { 1556 ceph_put_cap(session->s_mdsc, old_cap); 1557 old_cap = NULL; 1558 } 1559 1560 ret = cb(inode, cap, arg); 1561 last_inode = inode; 1562 1563 spin_lock(&session->s_cap_lock); 1564 p = p->next; 1565 if (!cap->ci) { 1566 dout("iterate_session_caps finishing cap %p removal\n", 1567 cap); 1568 BUG_ON(cap->session != session); 1569 cap->session = NULL; 1570 list_del_init(&cap->session_caps); 1571 session->s_nr_caps--; 1572 atomic64_dec(&session->s_mdsc->metric.total_caps); 1573 if (cap->queue_release) 1574 __ceph_queue_cap_release(session, cap); 1575 else 1576 old_cap = cap; /* put_cap it w/o locks held */ 1577 } 1578 if (ret < 0) 1579 goto out; 1580 } 1581 ret = 0; 1582 out: 1583 session->s_cap_iterator = NULL; 1584 spin_unlock(&session->s_cap_lock); 1585 1586 iput(last_inode); 1587 if (old_cap) 1588 ceph_put_cap(session->s_mdsc, old_cap); 1589 1590 return ret; 1591 } 1592 1593 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, 1594 void *arg) 1595 { 1596 struct ceph_inode_info *ci = ceph_inode(inode); 1597 bool invalidate = false; 1598 int iputs; 1599 1600 dout("removing cap %p, ci is %p, inode is %p\n", 1601 cap, ci, &ci->vfs_inode); 1602 spin_lock(&ci->i_ceph_lock); 1603 iputs = ceph_purge_inode_cap(inode, cap, &invalidate); 1604 spin_unlock(&ci->i_ceph_lock); 1605 1606 wake_up_all(&ci->i_cap_wq); 1607 if (invalidate) 1608 ceph_queue_invalidate(inode); 1609 while (iputs--) 1610 iput(inode); 1611 return 0; 1612 } 1613 1614 /* 1615 * caller must hold session s_mutex 1616 */ 1617 static void remove_session_caps(struct ceph_mds_session *session) 1618 { 1619 struct ceph_fs_client *fsc = session->s_mdsc->fsc; 1620 struct super_block *sb = fsc->sb; 1621 LIST_HEAD(dispose); 1622 1623 dout("remove_session_caps on %p\n", session); 1624 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc); 1625 1626 wake_up_all(&fsc->mdsc->cap_flushing_wq); 1627 1628 spin_lock(&session->s_cap_lock); 1629 if (session->s_nr_caps > 0) { 1630 struct inode *inode; 1631 struct ceph_cap *cap, *prev = NULL; 1632 struct ceph_vino vino; 1633 /* 1634 * iterate_session_caps() skips inodes that are being 1635 * deleted, we need to wait until deletions are complete. 1636 * __wait_on_freeing_inode() is designed for the job, 1637 * but it is not exported, so use lookup inode function 1638 * to access it. 1639 */ 1640 while (!list_empty(&session->s_caps)) { 1641 cap = list_entry(session->s_caps.next, 1642 struct ceph_cap, session_caps); 1643 if (cap == prev) 1644 break; 1645 prev = cap; 1646 vino = cap->ci->i_vino; 1647 spin_unlock(&session->s_cap_lock); 1648 1649 inode = ceph_find_inode(sb, vino); 1650 iput(inode); 1651 1652 spin_lock(&session->s_cap_lock); 1653 } 1654 } 1655 1656 // drop cap expires and unlock s_cap_lock 1657 detach_cap_releases(session, &dispose); 1658 1659 BUG_ON(session->s_nr_caps > 0); 1660 BUG_ON(!list_empty(&session->s_cap_flushing)); 1661 spin_unlock(&session->s_cap_lock); 1662 dispose_cap_releases(session->s_mdsc, &dispose); 1663 } 1664 1665 enum { 1666 RECONNECT, 1667 RENEWCAPS, 1668 FORCE_RO, 1669 }; 1670 1671 /* 1672 * wake up any threads waiting on this session's caps. if the cap is 1673 * old (didn't get renewed on the client reconnect), remove it now. 1674 * 1675 * caller must hold s_mutex. 1676 */ 1677 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, 1678 void *arg) 1679 { 1680 struct ceph_inode_info *ci = ceph_inode(inode); 1681 unsigned long ev = (unsigned long)arg; 1682 1683 if (ev == RECONNECT) { 1684 spin_lock(&ci->i_ceph_lock); 1685 ci->i_wanted_max_size = 0; 1686 ci->i_requested_max_size = 0; 1687 spin_unlock(&ci->i_ceph_lock); 1688 } else if (ev == RENEWCAPS) { 1689 if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) { 1690 /* mds did not re-issue stale cap */ 1691 spin_lock(&ci->i_ceph_lock); 1692 cap->issued = cap->implemented = CEPH_CAP_PIN; 1693 spin_unlock(&ci->i_ceph_lock); 1694 } 1695 } else if (ev == FORCE_RO) { 1696 } 1697 wake_up_all(&ci->i_cap_wq); 1698 return 0; 1699 } 1700 1701 static void wake_up_session_caps(struct ceph_mds_session *session, int ev) 1702 { 1703 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); 1704 ceph_iterate_session_caps(session, wake_up_session_cb, 1705 (void *)(unsigned long)ev); 1706 } 1707 1708 /* 1709 * Send periodic message to MDS renewing all currently held caps. The 1710 * ack will reset the expiration for all caps from this session. 1711 * 1712 * caller holds s_mutex 1713 */ 1714 static int send_renew_caps(struct ceph_mds_client *mdsc, 1715 struct ceph_mds_session *session) 1716 { 1717 struct ceph_msg *msg; 1718 int state; 1719 1720 if (time_after_eq(jiffies, session->s_cap_ttl) && 1721 time_after_eq(session->s_cap_ttl, session->s_renew_requested)) 1722 pr_info("mds%d caps stale\n", session->s_mds); 1723 session->s_renew_requested = jiffies; 1724 1725 /* do not try to renew caps until a recovering mds has reconnected 1726 * with its clients. */ 1727 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); 1728 if (state < CEPH_MDS_STATE_RECONNECT) { 1729 dout("send_renew_caps ignoring mds%d (%s)\n", 1730 session->s_mds, ceph_mds_state_name(state)); 1731 return 0; 1732 } 1733 1734 dout("send_renew_caps to mds%d (%s)\n", session->s_mds, 1735 ceph_mds_state_name(state)); 1736 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, 1737 ++session->s_renew_seq); 1738 if (!msg) 1739 return -ENOMEM; 1740 ceph_con_send(&session->s_con, msg); 1741 return 0; 1742 } 1743 1744 static int send_flushmsg_ack(struct ceph_mds_client *mdsc, 1745 struct ceph_mds_session *session, u64 seq) 1746 { 1747 struct ceph_msg *msg; 1748 1749 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", 1750 session->s_mds, ceph_session_state_name(session->s_state), seq); 1751 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); 1752 if (!msg) 1753 return -ENOMEM; 1754 ceph_con_send(&session->s_con, msg); 1755 return 0; 1756 } 1757 1758 1759 /* 1760 * Note new cap ttl, and any transition from stale -> not stale (fresh?). 1761 * 1762 * Called under session->s_mutex 1763 */ 1764 static void renewed_caps(struct ceph_mds_client *mdsc, 1765 struct ceph_mds_session *session, int is_renew) 1766 { 1767 int was_stale; 1768 int wake = 0; 1769 1770 spin_lock(&session->s_cap_lock); 1771 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); 1772 1773 session->s_cap_ttl = session->s_renew_requested + 1774 mdsc->mdsmap->m_session_timeout*HZ; 1775 1776 if (was_stale) { 1777 if (time_before(jiffies, session->s_cap_ttl)) { 1778 pr_info("mds%d caps renewed\n", session->s_mds); 1779 wake = 1; 1780 } else { 1781 pr_info("mds%d caps still stale\n", session->s_mds); 1782 } 1783 } 1784 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", 1785 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", 1786 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); 1787 spin_unlock(&session->s_cap_lock); 1788 1789 if (wake) 1790 wake_up_session_caps(session, RENEWCAPS); 1791 } 1792 1793 /* 1794 * send a session close request 1795 */ 1796 static int request_close_session(struct ceph_mds_session *session) 1797 { 1798 struct ceph_msg *msg; 1799 1800 dout("request_close_session mds%d state %s seq %lld\n", 1801 session->s_mds, ceph_session_state_name(session->s_state), 1802 session->s_seq); 1803 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE, 1804 session->s_seq); 1805 if (!msg) 1806 return -ENOMEM; 1807 ceph_con_send(&session->s_con, msg); 1808 return 1; 1809 } 1810 1811 /* 1812 * Called with s_mutex held. 1813 */ 1814 static int __close_session(struct ceph_mds_client *mdsc, 1815 struct ceph_mds_session *session) 1816 { 1817 if (session->s_state >= CEPH_MDS_SESSION_CLOSING) 1818 return 0; 1819 session->s_state = CEPH_MDS_SESSION_CLOSING; 1820 return request_close_session(session); 1821 } 1822 1823 static bool drop_negative_children(struct dentry *dentry) 1824 { 1825 struct dentry *child; 1826 bool all_negative = true; 1827 1828 if (!d_is_dir(dentry)) 1829 goto out; 1830 1831 spin_lock(&dentry->d_lock); 1832 list_for_each_entry(child, &dentry->d_subdirs, d_child) { 1833 if (d_really_is_positive(child)) { 1834 all_negative = false; 1835 break; 1836 } 1837 } 1838 spin_unlock(&dentry->d_lock); 1839 1840 if (all_negative) 1841 shrink_dcache_parent(dentry); 1842 out: 1843 return all_negative; 1844 } 1845 1846 /* 1847 * Trim old(er) caps. 1848 * 1849 * Because we can't cache an inode without one or more caps, we do 1850 * this indirectly: if a cap is unused, we prune its aliases, at which 1851 * point the inode will hopefully get dropped to. 1852 * 1853 * Yes, this is a bit sloppy. Our only real goal here is to respond to 1854 * memory pressure from the MDS, though, so it needn't be perfect. 1855 */ 1856 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) 1857 { 1858 int *remaining = arg; 1859 struct ceph_inode_info *ci = ceph_inode(inode); 1860 int used, wanted, oissued, mine; 1861 1862 if (*remaining <= 0) 1863 return -1; 1864 1865 spin_lock(&ci->i_ceph_lock); 1866 mine = cap->issued | cap->implemented; 1867 used = __ceph_caps_used(ci); 1868 wanted = __ceph_caps_file_wanted(ci); 1869 oissued = __ceph_caps_issued_other(ci, cap); 1870 1871 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", 1872 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), 1873 ceph_cap_string(used), ceph_cap_string(wanted)); 1874 if (cap == ci->i_auth_cap) { 1875 if (ci->i_dirty_caps || ci->i_flushing_caps || 1876 !list_empty(&ci->i_cap_snaps)) 1877 goto out; 1878 if ((used | wanted) & CEPH_CAP_ANY_WR) 1879 goto out; 1880 /* Note: it's possible that i_filelock_ref becomes non-zero 1881 * after dropping auth caps. It doesn't hurt because reply 1882 * of lock mds request will re-add auth caps. */ 1883 if (atomic_read(&ci->i_filelock_ref) > 0) 1884 goto out; 1885 } 1886 /* The inode has cached pages, but it's no longer used. 1887 * we can safely drop it */ 1888 if (S_ISREG(inode->i_mode) && 1889 wanted == 0 && used == CEPH_CAP_FILE_CACHE && 1890 !(oissued & CEPH_CAP_FILE_CACHE)) { 1891 used = 0; 1892 oissued = 0; 1893 } 1894 if ((used | wanted) & ~oissued & mine) 1895 goto out; /* we need these caps */ 1896 1897 if (oissued) { 1898 /* we aren't the only cap.. just remove us */ 1899 ceph_remove_cap(cap, true); 1900 (*remaining)--; 1901 } else { 1902 struct dentry *dentry; 1903 /* try dropping referring dentries */ 1904 spin_unlock(&ci->i_ceph_lock); 1905 dentry = d_find_any_alias(inode); 1906 if (dentry && drop_negative_children(dentry)) { 1907 int count; 1908 dput(dentry); 1909 d_prune_aliases(inode); 1910 count = atomic_read(&inode->i_count); 1911 if (count == 1) 1912 (*remaining)--; 1913 dout("trim_caps_cb %p cap %p pruned, count now %d\n", 1914 inode, cap, count); 1915 } else { 1916 dput(dentry); 1917 } 1918 return 0; 1919 } 1920 1921 out: 1922 spin_unlock(&ci->i_ceph_lock); 1923 return 0; 1924 } 1925 1926 /* 1927 * Trim session cap count down to some max number. 1928 */ 1929 int ceph_trim_caps(struct ceph_mds_client *mdsc, 1930 struct ceph_mds_session *session, 1931 int max_caps) 1932 { 1933 int trim_caps = session->s_nr_caps - max_caps; 1934 1935 dout("trim_caps mds%d start: %d / %d, trim %d\n", 1936 session->s_mds, session->s_nr_caps, max_caps, trim_caps); 1937 if (trim_caps > 0) { 1938 int remaining = trim_caps; 1939 1940 ceph_iterate_session_caps(session, trim_caps_cb, &remaining); 1941 dout("trim_caps mds%d done: %d / %d, trimmed %d\n", 1942 session->s_mds, session->s_nr_caps, max_caps, 1943 trim_caps - remaining); 1944 } 1945 1946 ceph_flush_cap_releases(mdsc, session); 1947 return 0; 1948 } 1949 1950 static int check_caps_flush(struct ceph_mds_client *mdsc, 1951 u64 want_flush_tid) 1952 { 1953 int ret = 1; 1954 1955 spin_lock(&mdsc->cap_dirty_lock); 1956 if (!list_empty(&mdsc->cap_flush_list)) { 1957 struct ceph_cap_flush *cf = 1958 list_first_entry(&mdsc->cap_flush_list, 1959 struct ceph_cap_flush, g_list); 1960 if (cf->tid <= want_flush_tid) { 1961 dout("check_caps_flush still flushing tid " 1962 "%llu <= %llu\n", cf->tid, want_flush_tid); 1963 ret = 0; 1964 } 1965 } 1966 spin_unlock(&mdsc->cap_dirty_lock); 1967 return ret; 1968 } 1969 1970 /* 1971 * flush all dirty inode data to disk. 1972 * 1973 * returns true if we've flushed through want_flush_tid 1974 */ 1975 static void wait_caps_flush(struct ceph_mds_client *mdsc, 1976 u64 want_flush_tid) 1977 { 1978 dout("check_caps_flush want %llu\n", want_flush_tid); 1979 1980 wait_event(mdsc->cap_flushing_wq, 1981 check_caps_flush(mdsc, want_flush_tid)); 1982 1983 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid); 1984 } 1985 1986 /* 1987 * called under s_mutex 1988 */ 1989 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc, 1990 struct ceph_mds_session *session) 1991 { 1992 struct ceph_msg *msg = NULL; 1993 struct ceph_mds_cap_release *head; 1994 struct ceph_mds_cap_item *item; 1995 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; 1996 struct ceph_cap *cap; 1997 LIST_HEAD(tmp_list); 1998 int num_cap_releases; 1999 __le32 barrier, *cap_barrier; 2000 2001 down_read(&osdc->lock); 2002 barrier = cpu_to_le32(osdc->epoch_barrier); 2003 up_read(&osdc->lock); 2004 2005 spin_lock(&session->s_cap_lock); 2006 again: 2007 list_splice_init(&session->s_cap_releases, &tmp_list); 2008 num_cap_releases = session->s_num_cap_releases; 2009 session->s_num_cap_releases = 0; 2010 spin_unlock(&session->s_cap_lock); 2011 2012 while (!list_empty(&tmp_list)) { 2013 if (!msg) { 2014 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, 2015 PAGE_SIZE, GFP_NOFS, false); 2016 if (!msg) 2017 goto out_err; 2018 head = msg->front.iov_base; 2019 head->num = cpu_to_le32(0); 2020 msg->front.iov_len = sizeof(*head); 2021 2022 msg->hdr.version = cpu_to_le16(2); 2023 msg->hdr.compat_version = cpu_to_le16(1); 2024 } 2025 2026 cap = list_first_entry(&tmp_list, struct ceph_cap, 2027 session_caps); 2028 list_del(&cap->session_caps); 2029 num_cap_releases--; 2030 2031 head = msg->front.iov_base; 2032 put_unaligned_le32(get_unaligned_le32(&head->num) + 1, 2033 &head->num); 2034 item = msg->front.iov_base + msg->front.iov_len; 2035 item->ino = cpu_to_le64(cap->cap_ino); 2036 item->cap_id = cpu_to_le64(cap->cap_id); 2037 item->migrate_seq = cpu_to_le32(cap->mseq); 2038 item->seq = cpu_to_le32(cap->issue_seq); 2039 msg->front.iov_len += sizeof(*item); 2040 2041 ceph_put_cap(mdsc, cap); 2042 2043 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { 2044 // Append cap_barrier field 2045 cap_barrier = msg->front.iov_base + msg->front.iov_len; 2046 *cap_barrier = barrier; 2047 msg->front.iov_len += sizeof(*cap_barrier); 2048 2049 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2050 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); 2051 ceph_con_send(&session->s_con, msg); 2052 msg = NULL; 2053 } 2054 } 2055 2056 BUG_ON(num_cap_releases != 0); 2057 2058 spin_lock(&session->s_cap_lock); 2059 if (!list_empty(&session->s_cap_releases)) 2060 goto again; 2061 spin_unlock(&session->s_cap_lock); 2062 2063 if (msg) { 2064 // Append cap_barrier field 2065 cap_barrier = msg->front.iov_base + msg->front.iov_len; 2066 *cap_barrier = barrier; 2067 msg->front.iov_len += sizeof(*cap_barrier); 2068 2069 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2070 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); 2071 ceph_con_send(&session->s_con, msg); 2072 } 2073 return; 2074 out_err: 2075 pr_err("send_cap_releases mds%d, failed to allocate message\n", 2076 session->s_mds); 2077 spin_lock(&session->s_cap_lock); 2078 list_splice(&tmp_list, &session->s_cap_releases); 2079 session->s_num_cap_releases += num_cap_releases; 2080 spin_unlock(&session->s_cap_lock); 2081 } 2082 2083 static void ceph_cap_release_work(struct work_struct *work) 2084 { 2085 struct ceph_mds_session *session = 2086 container_of(work, struct ceph_mds_session, s_cap_release_work); 2087 2088 mutex_lock(&session->s_mutex); 2089 if (session->s_state == CEPH_MDS_SESSION_OPEN || 2090 session->s_state == CEPH_MDS_SESSION_HUNG) 2091 ceph_send_cap_releases(session->s_mdsc, session); 2092 mutex_unlock(&session->s_mutex); 2093 ceph_put_mds_session(session); 2094 } 2095 2096 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, 2097 struct ceph_mds_session *session) 2098 { 2099 if (mdsc->stopping) 2100 return; 2101 2102 ceph_get_mds_session(session); 2103 if (queue_work(mdsc->fsc->cap_wq, 2104 &session->s_cap_release_work)) { 2105 dout("cap release work queued\n"); 2106 } else { 2107 ceph_put_mds_session(session); 2108 dout("failed to queue cap release work\n"); 2109 } 2110 } 2111 2112 /* 2113 * caller holds session->s_cap_lock 2114 */ 2115 void __ceph_queue_cap_release(struct ceph_mds_session *session, 2116 struct ceph_cap *cap) 2117 { 2118 list_add_tail(&cap->session_caps, &session->s_cap_releases); 2119 session->s_num_cap_releases++; 2120 2121 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE)) 2122 ceph_flush_cap_releases(session->s_mdsc, session); 2123 } 2124 2125 static void ceph_cap_reclaim_work(struct work_struct *work) 2126 { 2127 struct ceph_mds_client *mdsc = 2128 container_of(work, struct ceph_mds_client, cap_reclaim_work); 2129 int ret = ceph_trim_dentries(mdsc); 2130 if (ret == -EAGAIN) 2131 ceph_queue_cap_reclaim_work(mdsc); 2132 } 2133 2134 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc) 2135 { 2136 if (mdsc->stopping) 2137 return; 2138 2139 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) { 2140 dout("caps reclaim work queued\n"); 2141 } else { 2142 dout("failed to queue caps release work\n"); 2143 } 2144 } 2145 2146 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr) 2147 { 2148 int val; 2149 if (!nr) 2150 return; 2151 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending); 2152 if ((val % CEPH_CAPS_PER_RELEASE) < nr) { 2153 atomic_set(&mdsc->cap_reclaim_pending, 0); 2154 ceph_queue_cap_reclaim_work(mdsc); 2155 } 2156 } 2157 2158 /* 2159 * requests 2160 */ 2161 2162 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 2163 struct inode *dir) 2164 { 2165 struct ceph_inode_info *ci = ceph_inode(dir); 2166 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 2167 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; 2168 size_t size = sizeof(struct ceph_mds_reply_dir_entry); 2169 unsigned int num_entries; 2170 int order; 2171 2172 spin_lock(&ci->i_ceph_lock); 2173 num_entries = ci->i_files + ci->i_subdirs; 2174 spin_unlock(&ci->i_ceph_lock); 2175 num_entries = max(num_entries, 1U); 2176 num_entries = min(num_entries, opt->max_readdir); 2177 2178 order = get_order(size * num_entries); 2179 while (order >= 0) { 2180 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL | 2181 __GFP_NOWARN, 2182 order); 2183 if (rinfo->dir_entries) 2184 break; 2185 order--; 2186 } 2187 if (!rinfo->dir_entries) 2188 return -ENOMEM; 2189 2190 num_entries = (PAGE_SIZE << order) / size; 2191 num_entries = min(num_entries, opt->max_readdir); 2192 2193 rinfo->dir_buf_size = PAGE_SIZE << order; 2194 req->r_num_caps = num_entries + 1; 2195 req->r_args.readdir.max_entries = cpu_to_le32(num_entries); 2196 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); 2197 return 0; 2198 } 2199 2200 /* 2201 * Create an mds request. 2202 */ 2203 struct ceph_mds_request * 2204 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) 2205 { 2206 struct ceph_mds_request *req; 2207 2208 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS); 2209 if (!req) 2210 return ERR_PTR(-ENOMEM); 2211 2212 mutex_init(&req->r_fill_mutex); 2213 req->r_mdsc = mdsc; 2214 req->r_started = jiffies; 2215 req->r_start_latency = ktime_get(); 2216 req->r_resend_mds = -1; 2217 INIT_LIST_HEAD(&req->r_unsafe_dir_item); 2218 INIT_LIST_HEAD(&req->r_unsafe_target_item); 2219 req->r_fmode = -1; 2220 kref_init(&req->r_kref); 2221 RB_CLEAR_NODE(&req->r_node); 2222 INIT_LIST_HEAD(&req->r_wait); 2223 init_completion(&req->r_completion); 2224 init_completion(&req->r_safe_completion); 2225 INIT_LIST_HEAD(&req->r_unsafe_item); 2226 2227 ktime_get_coarse_real_ts64(&req->r_stamp); 2228 2229 req->r_op = op; 2230 req->r_direct_mode = mode; 2231 return req; 2232 } 2233 2234 /* 2235 * return oldest (lowest) request, tid in request tree, 0 if none. 2236 * 2237 * called under mdsc->mutex. 2238 */ 2239 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) 2240 { 2241 if (RB_EMPTY_ROOT(&mdsc->request_tree)) 2242 return NULL; 2243 return rb_entry(rb_first(&mdsc->request_tree), 2244 struct ceph_mds_request, r_node); 2245 } 2246 2247 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) 2248 { 2249 return mdsc->oldest_tid; 2250 } 2251 2252 /* 2253 * Build a dentry's path. Allocate on heap; caller must kfree. Based 2254 * on build_path_from_dentry in fs/cifs/dir.c. 2255 * 2256 * If @stop_on_nosnap, generate path relative to the first non-snapped 2257 * inode. 2258 * 2259 * Encode hidden .snap dirs as a double /, i.e. 2260 * foo/.snap/bar -> foo//bar 2261 */ 2262 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, 2263 int stop_on_nosnap) 2264 { 2265 struct dentry *temp; 2266 char *path; 2267 int pos; 2268 unsigned seq; 2269 u64 base; 2270 2271 if (!dentry) 2272 return ERR_PTR(-EINVAL); 2273 2274 path = __getname(); 2275 if (!path) 2276 return ERR_PTR(-ENOMEM); 2277 retry: 2278 pos = PATH_MAX - 1; 2279 path[pos] = '\0'; 2280 2281 seq = read_seqbegin(&rename_lock); 2282 rcu_read_lock(); 2283 temp = dentry; 2284 for (;;) { 2285 struct inode *inode; 2286 2287 spin_lock(&temp->d_lock); 2288 inode = d_inode(temp); 2289 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { 2290 dout("build_path path+%d: %p SNAPDIR\n", 2291 pos, temp); 2292 } else if (stop_on_nosnap && inode && dentry != temp && 2293 ceph_snap(inode) == CEPH_NOSNAP) { 2294 spin_unlock(&temp->d_lock); 2295 pos++; /* get rid of any prepended '/' */ 2296 break; 2297 } else { 2298 pos -= temp->d_name.len; 2299 if (pos < 0) { 2300 spin_unlock(&temp->d_lock); 2301 break; 2302 } 2303 memcpy(path + pos, temp->d_name.name, temp->d_name.len); 2304 } 2305 spin_unlock(&temp->d_lock); 2306 temp = READ_ONCE(temp->d_parent); 2307 2308 /* Are we at the root? */ 2309 if (IS_ROOT(temp)) 2310 break; 2311 2312 /* Are we out of buffer? */ 2313 if (--pos < 0) 2314 break; 2315 2316 path[pos] = '/'; 2317 } 2318 base = ceph_ino(d_inode(temp)); 2319 rcu_read_unlock(); 2320 2321 if (read_seqretry(&rename_lock, seq)) 2322 goto retry; 2323 2324 if (pos < 0) { 2325 /* 2326 * A rename didn't occur, but somehow we didn't end up where 2327 * we thought we would. Throw a warning and try again. 2328 */ 2329 pr_warn("build_path did not end path lookup where " 2330 "expected, pos is %d\n", pos); 2331 goto retry; 2332 } 2333 2334 *pbase = base; 2335 *plen = PATH_MAX - 1 - pos; 2336 dout("build_path on %p %d built %llx '%.*s'\n", 2337 dentry, d_count(dentry), base, *plen, path + pos); 2338 return path + pos; 2339 } 2340 2341 static int build_dentry_path(struct dentry *dentry, struct inode *dir, 2342 const char **ppath, int *ppathlen, u64 *pino, 2343 bool *pfreepath, bool parent_locked) 2344 { 2345 char *path; 2346 2347 rcu_read_lock(); 2348 if (!dir) 2349 dir = d_inode_rcu(dentry->d_parent); 2350 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) { 2351 *pino = ceph_ino(dir); 2352 rcu_read_unlock(); 2353 *ppath = dentry->d_name.name; 2354 *ppathlen = dentry->d_name.len; 2355 return 0; 2356 } 2357 rcu_read_unlock(); 2358 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); 2359 if (IS_ERR(path)) 2360 return PTR_ERR(path); 2361 *ppath = path; 2362 *pfreepath = true; 2363 return 0; 2364 } 2365 2366 static int build_inode_path(struct inode *inode, 2367 const char **ppath, int *ppathlen, u64 *pino, 2368 bool *pfreepath) 2369 { 2370 struct dentry *dentry; 2371 char *path; 2372 2373 if (ceph_snap(inode) == CEPH_NOSNAP) { 2374 *pino = ceph_ino(inode); 2375 *ppathlen = 0; 2376 return 0; 2377 } 2378 dentry = d_find_alias(inode); 2379 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); 2380 dput(dentry); 2381 if (IS_ERR(path)) 2382 return PTR_ERR(path); 2383 *ppath = path; 2384 *pfreepath = true; 2385 return 0; 2386 } 2387 2388 /* 2389 * request arguments may be specified via an inode *, a dentry *, or 2390 * an explicit ino+path. 2391 */ 2392 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, 2393 struct inode *rdiri, const char *rpath, 2394 u64 rino, const char **ppath, int *pathlen, 2395 u64 *ino, bool *freepath, bool parent_locked) 2396 { 2397 int r = 0; 2398 2399 if (rinode) { 2400 r = build_inode_path(rinode, ppath, pathlen, ino, freepath); 2401 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), 2402 ceph_snap(rinode)); 2403 } else if (rdentry) { 2404 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino, 2405 freepath, parent_locked); 2406 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, 2407 *ppath); 2408 } else if (rpath || rino) { 2409 *ino = rino; 2410 *ppath = rpath; 2411 *pathlen = rpath ? strlen(rpath) : 0; 2412 dout(" path %.*s\n", *pathlen, rpath); 2413 } 2414 2415 return r; 2416 } 2417 2418 static void encode_timestamp_and_gids(void **p, 2419 const struct ceph_mds_request *req) 2420 { 2421 struct ceph_timespec ts; 2422 int i; 2423 2424 ceph_encode_timespec64(&ts, &req->r_stamp); 2425 ceph_encode_copy(p, &ts, sizeof(ts)); 2426 2427 /* gid_list */ 2428 ceph_encode_32(p, req->r_cred->group_info->ngroups); 2429 for (i = 0; i < req->r_cred->group_info->ngroups; i++) 2430 ceph_encode_64(p, from_kgid(&init_user_ns, 2431 req->r_cred->group_info->gid[i])); 2432 } 2433 2434 /* 2435 * called under mdsc->mutex 2436 */ 2437 static struct ceph_msg *create_request_message(struct ceph_mds_session *session, 2438 struct ceph_mds_request *req, 2439 bool drop_cap_releases) 2440 { 2441 int mds = session->s_mds; 2442 struct ceph_mds_client *mdsc = session->s_mdsc; 2443 struct ceph_msg *msg; 2444 struct ceph_mds_request_head_old *head; 2445 const char *path1 = NULL; 2446 const char *path2 = NULL; 2447 u64 ino1 = 0, ino2 = 0; 2448 int pathlen1 = 0, pathlen2 = 0; 2449 bool freepath1 = false, freepath2 = false; 2450 int len; 2451 u16 releases; 2452 void *p, *end; 2453 int ret; 2454 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME); 2455 2456 ret = set_request_path_attr(req->r_inode, req->r_dentry, 2457 req->r_parent, req->r_path1, req->r_ino1.ino, 2458 &path1, &pathlen1, &ino1, &freepath1, 2459 test_bit(CEPH_MDS_R_PARENT_LOCKED, 2460 &req->r_req_flags)); 2461 if (ret < 0) { 2462 msg = ERR_PTR(ret); 2463 goto out; 2464 } 2465 2466 /* If r_old_dentry is set, then assume that its parent is locked */ 2467 ret = set_request_path_attr(NULL, req->r_old_dentry, 2468 req->r_old_dentry_dir, 2469 req->r_path2, req->r_ino2.ino, 2470 &path2, &pathlen2, &ino2, &freepath2, true); 2471 if (ret < 0) { 2472 msg = ERR_PTR(ret); 2473 goto out_free1; 2474 } 2475 2476 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head); 2477 len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + 2478 sizeof(struct ceph_timespec); 2479 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups); 2480 2481 /* calculate (max) length for cap releases */ 2482 len += sizeof(struct ceph_mds_request_release) * 2483 (!!req->r_inode_drop + !!req->r_dentry_drop + 2484 !!req->r_old_inode_drop + !!req->r_old_dentry_drop); 2485 2486 if (req->r_dentry_drop) 2487 len += pathlen1; 2488 if (req->r_old_dentry_drop) 2489 len += pathlen2; 2490 2491 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false); 2492 if (!msg) { 2493 msg = ERR_PTR(-ENOMEM); 2494 goto out_free2; 2495 } 2496 2497 msg->hdr.tid = cpu_to_le64(req->r_tid); 2498 2499 /* 2500 * The old ceph_mds_request_head didn't contain a version field, and 2501 * one was added when we moved the message version from 3->4. 2502 */ 2503 if (legacy) { 2504 msg->hdr.version = cpu_to_le16(3); 2505 head = msg->front.iov_base; 2506 p = msg->front.iov_base + sizeof(*head); 2507 } else { 2508 struct ceph_mds_request_head *new_head = msg->front.iov_base; 2509 2510 msg->hdr.version = cpu_to_le16(4); 2511 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION); 2512 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid; 2513 p = msg->front.iov_base + sizeof(*new_head); 2514 } 2515 2516 end = msg->front.iov_base + msg->front.iov_len; 2517 2518 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); 2519 head->op = cpu_to_le32(req->r_op); 2520 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, 2521 req->r_cred->fsuid)); 2522 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, 2523 req->r_cred->fsgid)); 2524 head->ino = cpu_to_le64(req->r_deleg_ino); 2525 head->args = req->r_args; 2526 2527 ceph_encode_filepath(&p, end, ino1, path1); 2528 ceph_encode_filepath(&p, end, ino2, path2); 2529 2530 /* make note of release offset, in case we need to replay */ 2531 req->r_request_release_offset = p - msg->front.iov_base; 2532 2533 /* cap releases */ 2534 releases = 0; 2535 if (req->r_inode_drop) 2536 releases += ceph_encode_inode_release(&p, 2537 req->r_inode ? req->r_inode : d_inode(req->r_dentry), 2538 mds, req->r_inode_drop, req->r_inode_unless, 2539 req->r_op == CEPH_MDS_OP_READDIR); 2540 if (req->r_dentry_drop) 2541 releases += ceph_encode_dentry_release(&p, req->r_dentry, 2542 req->r_parent, mds, req->r_dentry_drop, 2543 req->r_dentry_unless); 2544 if (req->r_old_dentry_drop) 2545 releases += ceph_encode_dentry_release(&p, req->r_old_dentry, 2546 req->r_old_dentry_dir, mds, 2547 req->r_old_dentry_drop, 2548 req->r_old_dentry_unless); 2549 if (req->r_old_inode_drop) 2550 releases += ceph_encode_inode_release(&p, 2551 d_inode(req->r_old_dentry), 2552 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); 2553 2554 if (drop_cap_releases) { 2555 releases = 0; 2556 p = msg->front.iov_base + req->r_request_release_offset; 2557 } 2558 2559 head->num_releases = cpu_to_le16(releases); 2560 2561 encode_timestamp_and_gids(&p, req); 2562 2563 if (WARN_ON_ONCE(p > end)) { 2564 ceph_msg_put(msg); 2565 msg = ERR_PTR(-ERANGE); 2566 goto out_free2; 2567 } 2568 2569 msg->front.iov_len = p - msg->front.iov_base; 2570 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2571 2572 if (req->r_pagelist) { 2573 struct ceph_pagelist *pagelist = req->r_pagelist; 2574 ceph_msg_data_add_pagelist(msg, pagelist); 2575 msg->hdr.data_len = cpu_to_le32(pagelist->length); 2576 } else { 2577 msg->hdr.data_len = 0; 2578 } 2579 2580 msg->hdr.data_off = cpu_to_le16(0); 2581 2582 out_free2: 2583 if (freepath2) 2584 ceph_mdsc_free_path((char *)path2, pathlen2); 2585 out_free1: 2586 if (freepath1) 2587 ceph_mdsc_free_path((char *)path1, pathlen1); 2588 out: 2589 return msg; 2590 } 2591 2592 /* 2593 * called under mdsc->mutex if error, under no mutex if 2594 * success. 2595 */ 2596 static void complete_request(struct ceph_mds_client *mdsc, 2597 struct ceph_mds_request *req) 2598 { 2599 req->r_end_latency = ktime_get(); 2600 2601 if (req->r_callback) 2602 req->r_callback(mdsc, req); 2603 complete_all(&req->r_completion); 2604 } 2605 2606 static struct ceph_mds_request_head_old * 2607 find_old_request_head(void *p, u64 features) 2608 { 2609 bool legacy = !(features & CEPH_FEATURE_FS_BTIME); 2610 struct ceph_mds_request_head *new_head; 2611 2612 if (legacy) 2613 return (struct ceph_mds_request_head_old *)p; 2614 new_head = (struct ceph_mds_request_head *)p; 2615 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid; 2616 } 2617 2618 /* 2619 * called under mdsc->mutex 2620 */ 2621 static int __prepare_send_request(struct ceph_mds_session *session, 2622 struct ceph_mds_request *req, 2623 bool drop_cap_releases) 2624 { 2625 int mds = session->s_mds; 2626 struct ceph_mds_client *mdsc = session->s_mdsc; 2627 struct ceph_mds_request_head_old *rhead; 2628 struct ceph_msg *msg; 2629 int flags = 0; 2630 2631 req->r_attempts++; 2632 if (req->r_inode) { 2633 struct ceph_cap *cap = 2634 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); 2635 2636 if (cap) 2637 req->r_sent_on_mseq = cap->mseq; 2638 else 2639 req->r_sent_on_mseq = -1; 2640 } 2641 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, 2642 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); 2643 2644 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 2645 void *p; 2646 2647 /* 2648 * Replay. Do not regenerate message (and rebuild 2649 * paths, etc.); just use the original message. 2650 * Rebuilding paths will break for renames because 2651 * d_move mangles the src name. 2652 */ 2653 msg = req->r_request; 2654 rhead = find_old_request_head(msg->front.iov_base, 2655 session->s_con.peer_features); 2656 2657 flags = le32_to_cpu(rhead->flags); 2658 flags |= CEPH_MDS_FLAG_REPLAY; 2659 rhead->flags = cpu_to_le32(flags); 2660 2661 if (req->r_target_inode) 2662 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); 2663 2664 rhead->num_retry = req->r_attempts - 1; 2665 2666 /* remove cap/dentry releases from message */ 2667 rhead->num_releases = 0; 2668 2669 p = msg->front.iov_base + req->r_request_release_offset; 2670 encode_timestamp_and_gids(&p, req); 2671 2672 msg->front.iov_len = p - msg->front.iov_base; 2673 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2674 return 0; 2675 } 2676 2677 if (req->r_request) { 2678 ceph_msg_put(req->r_request); 2679 req->r_request = NULL; 2680 } 2681 msg = create_request_message(session, req, drop_cap_releases); 2682 if (IS_ERR(msg)) { 2683 req->r_err = PTR_ERR(msg); 2684 return PTR_ERR(msg); 2685 } 2686 req->r_request = msg; 2687 2688 rhead = find_old_request_head(msg->front.iov_base, 2689 session->s_con.peer_features); 2690 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); 2691 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 2692 flags |= CEPH_MDS_FLAG_REPLAY; 2693 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) 2694 flags |= CEPH_MDS_FLAG_ASYNC; 2695 if (req->r_parent) 2696 flags |= CEPH_MDS_FLAG_WANT_DENTRY; 2697 rhead->flags = cpu_to_le32(flags); 2698 rhead->num_fwd = req->r_num_fwd; 2699 rhead->num_retry = req->r_attempts - 1; 2700 2701 dout(" r_parent = %p\n", req->r_parent); 2702 return 0; 2703 } 2704 2705 /* 2706 * called under mdsc->mutex 2707 */ 2708 static int __send_request(struct ceph_mds_session *session, 2709 struct ceph_mds_request *req, 2710 bool drop_cap_releases) 2711 { 2712 int err; 2713 2714 err = __prepare_send_request(session, req, drop_cap_releases); 2715 if (!err) { 2716 ceph_msg_get(req->r_request); 2717 ceph_con_send(&session->s_con, req->r_request); 2718 } 2719 2720 return err; 2721 } 2722 2723 /* 2724 * send request, or put it on the appropriate wait list. 2725 */ 2726 static void __do_request(struct ceph_mds_client *mdsc, 2727 struct ceph_mds_request *req) 2728 { 2729 struct ceph_mds_session *session = NULL; 2730 int mds = -1; 2731 int err = 0; 2732 bool random; 2733 2734 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { 2735 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) 2736 __unregister_request(mdsc, req); 2737 return; 2738 } 2739 2740 if (req->r_timeout && 2741 time_after_eq(jiffies, req->r_started + req->r_timeout)) { 2742 dout("do_request timed out\n"); 2743 err = -ETIMEDOUT; 2744 goto finish; 2745 } 2746 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 2747 dout("do_request forced umount\n"); 2748 err = -EIO; 2749 goto finish; 2750 } 2751 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) { 2752 if (mdsc->mdsmap_err) { 2753 err = mdsc->mdsmap_err; 2754 dout("do_request mdsmap err %d\n", err); 2755 goto finish; 2756 } 2757 if (mdsc->mdsmap->m_epoch == 0) { 2758 dout("do_request no mdsmap, waiting for map\n"); 2759 list_add(&req->r_wait, &mdsc->waiting_for_map); 2760 return; 2761 } 2762 if (!(mdsc->fsc->mount_options->flags & 2763 CEPH_MOUNT_OPT_MOUNTWAIT) && 2764 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) { 2765 err = -EHOSTUNREACH; 2766 goto finish; 2767 } 2768 } 2769 2770 put_request_session(req); 2771 2772 mds = __choose_mds(mdsc, req, &random); 2773 if (mds < 0 || 2774 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { 2775 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { 2776 err = -EJUKEBOX; 2777 goto finish; 2778 } 2779 dout("do_request no mds or not active, waiting for map\n"); 2780 list_add(&req->r_wait, &mdsc->waiting_for_map); 2781 return; 2782 } 2783 2784 /* get, open session */ 2785 session = __ceph_lookup_mds_session(mdsc, mds); 2786 if (!session) { 2787 session = register_session(mdsc, mds); 2788 if (IS_ERR(session)) { 2789 err = PTR_ERR(session); 2790 goto finish; 2791 } 2792 } 2793 req->r_session = ceph_get_mds_session(session); 2794 2795 dout("do_request mds%d session %p state %s\n", mds, session, 2796 ceph_session_state_name(session->s_state)); 2797 if (session->s_state != CEPH_MDS_SESSION_OPEN && 2798 session->s_state != CEPH_MDS_SESSION_HUNG) { 2799 /* 2800 * We cannot queue async requests since the caps and delegated 2801 * inodes are bound to the session. Just return -EJUKEBOX and 2802 * let the caller retry a sync request in that case. 2803 */ 2804 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { 2805 err = -EJUKEBOX; 2806 goto out_session; 2807 } 2808 2809 /* 2810 * If the session has been REJECTED, then return a hard error, 2811 * unless it's a CLEANRECOVER mount, in which case we'll queue 2812 * it to the mdsc queue. 2813 */ 2814 if (session->s_state == CEPH_MDS_SESSION_REJECTED) { 2815 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER)) 2816 list_add(&req->r_wait, &mdsc->waiting_for_map); 2817 else 2818 err = -EACCES; 2819 goto out_session; 2820 } 2821 2822 if (session->s_state == CEPH_MDS_SESSION_NEW || 2823 session->s_state == CEPH_MDS_SESSION_CLOSING) { 2824 err = __open_session(mdsc, session); 2825 if (err) 2826 goto out_session; 2827 /* retry the same mds later */ 2828 if (random) 2829 req->r_resend_mds = mds; 2830 } 2831 list_add(&req->r_wait, &session->s_waiting); 2832 goto out_session; 2833 } 2834 2835 /* send request */ 2836 req->r_resend_mds = -1; /* forget any previous mds hint */ 2837 2838 if (req->r_request_started == 0) /* note request start time */ 2839 req->r_request_started = jiffies; 2840 2841 err = __send_request(session, req, false); 2842 2843 out_session: 2844 ceph_put_mds_session(session); 2845 finish: 2846 if (err) { 2847 dout("__do_request early error %d\n", err); 2848 req->r_err = err; 2849 complete_request(mdsc, req); 2850 __unregister_request(mdsc, req); 2851 } 2852 return; 2853 } 2854 2855 /* 2856 * called under mdsc->mutex 2857 */ 2858 static void __wake_requests(struct ceph_mds_client *mdsc, 2859 struct list_head *head) 2860 { 2861 struct ceph_mds_request *req; 2862 LIST_HEAD(tmp_list); 2863 2864 list_splice_init(head, &tmp_list); 2865 2866 while (!list_empty(&tmp_list)) { 2867 req = list_entry(tmp_list.next, 2868 struct ceph_mds_request, r_wait); 2869 list_del_init(&req->r_wait); 2870 dout(" wake request %p tid %llu\n", req, req->r_tid); 2871 __do_request(mdsc, req); 2872 } 2873 } 2874 2875 /* 2876 * Wake up threads with requests pending for @mds, so that they can 2877 * resubmit their requests to a possibly different mds. 2878 */ 2879 static void kick_requests(struct ceph_mds_client *mdsc, int mds) 2880 { 2881 struct ceph_mds_request *req; 2882 struct rb_node *p = rb_first(&mdsc->request_tree); 2883 2884 dout("kick_requests mds%d\n", mds); 2885 while (p) { 2886 req = rb_entry(p, struct ceph_mds_request, r_node); 2887 p = rb_next(p); 2888 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 2889 continue; 2890 if (req->r_attempts > 0) 2891 continue; /* only new requests */ 2892 if (req->r_session && 2893 req->r_session->s_mds == mds) { 2894 dout(" kicking tid %llu\n", req->r_tid); 2895 list_del_init(&req->r_wait); 2896 __do_request(mdsc, req); 2897 } 2898 } 2899 } 2900 2901 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir, 2902 struct ceph_mds_request *req) 2903 { 2904 int err = 0; 2905 2906 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */ 2907 if (req->r_inode) 2908 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 2909 if (req->r_parent) { 2910 struct ceph_inode_info *ci = ceph_inode(req->r_parent); 2911 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ? 2912 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD; 2913 spin_lock(&ci->i_ceph_lock); 2914 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false); 2915 __ceph_touch_fmode(ci, mdsc, fmode); 2916 spin_unlock(&ci->i_ceph_lock); 2917 } 2918 if (req->r_old_dentry_dir) 2919 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), 2920 CEPH_CAP_PIN); 2921 2922 if (req->r_inode) { 2923 err = ceph_wait_on_async_create(req->r_inode); 2924 if (err) { 2925 dout("%s: wait for async create returned: %d\n", 2926 __func__, err); 2927 return err; 2928 } 2929 } 2930 2931 if (!err && req->r_old_inode) { 2932 err = ceph_wait_on_async_create(req->r_old_inode); 2933 if (err) { 2934 dout("%s: wait for async create returned: %d\n", 2935 __func__, err); 2936 return err; 2937 } 2938 } 2939 2940 dout("submit_request on %p for inode %p\n", req, dir); 2941 mutex_lock(&mdsc->mutex); 2942 __register_request(mdsc, req, dir); 2943 __do_request(mdsc, req); 2944 err = req->r_err; 2945 mutex_unlock(&mdsc->mutex); 2946 return err; 2947 } 2948 2949 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 2950 struct ceph_mds_request *req) 2951 { 2952 int err; 2953 2954 /* wait */ 2955 dout("do_request waiting\n"); 2956 if (!req->r_timeout && req->r_wait_for_completion) { 2957 err = req->r_wait_for_completion(mdsc, req); 2958 } else { 2959 long timeleft = wait_for_completion_killable_timeout( 2960 &req->r_completion, 2961 ceph_timeout_jiffies(req->r_timeout)); 2962 if (timeleft > 0) 2963 err = 0; 2964 else if (!timeleft) 2965 err = -ETIMEDOUT; /* timed out */ 2966 else 2967 err = timeleft; /* killed */ 2968 } 2969 dout("do_request waited, got %d\n", err); 2970 mutex_lock(&mdsc->mutex); 2971 2972 /* only abort if we didn't race with a real reply */ 2973 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { 2974 err = le32_to_cpu(req->r_reply_info.head->result); 2975 } else if (err < 0) { 2976 dout("aborted request %lld with %d\n", req->r_tid, err); 2977 2978 /* 2979 * ensure we aren't running concurrently with 2980 * ceph_fill_trace or ceph_readdir_prepopulate, which 2981 * rely on locks (dir mutex) held by our caller. 2982 */ 2983 mutex_lock(&req->r_fill_mutex); 2984 req->r_err = err; 2985 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); 2986 mutex_unlock(&req->r_fill_mutex); 2987 2988 if (req->r_parent && 2989 (req->r_op & CEPH_MDS_OP_WRITE)) 2990 ceph_invalidate_dir_request(req); 2991 } else { 2992 err = req->r_err; 2993 } 2994 2995 mutex_unlock(&mdsc->mutex); 2996 return err; 2997 } 2998 2999 /* 3000 * Synchrously perform an mds request. Take care of all of the 3001 * session setup, forwarding, retry details. 3002 */ 3003 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 3004 struct inode *dir, 3005 struct ceph_mds_request *req) 3006 { 3007 int err; 3008 3009 dout("do_request on %p\n", req); 3010 3011 /* issue */ 3012 err = ceph_mdsc_submit_request(mdsc, dir, req); 3013 if (!err) 3014 err = ceph_mdsc_wait_request(mdsc, req); 3015 dout("do_request %p done, result %d\n", req, err); 3016 return err; 3017 } 3018 3019 /* 3020 * Invalidate dir's completeness, dentry lease state on an aborted MDS 3021 * namespace request. 3022 */ 3023 void ceph_invalidate_dir_request(struct ceph_mds_request *req) 3024 { 3025 struct inode *dir = req->r_parent; 3026 struct inode *old_dir = req->r_old_dentry_dir; 3027 3028 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir); 3029 3030 ceph_dir_clear_complete(dir); 3031 if (old_dir) 3032 ceph_dir_clear_complete(old_dir); 3033 if (req->r_dentry) 3034 ceph_invalidate_dentry_lease(req->r_dentry); 3035 if (req->r_old_dentry) 3036 ceph_invalidate_dentry_lease(req->r_old_dentry); 3037 } 3038 3039 /* 3040 * Handle mds reply. 3041 * 3042 * We take the session mutex and parse and process the reply immediately. 3043 * This preserves the logical ordering of replies, capabilities, etc., sent 3044 * by the MDS as they are applied to our local cache. 3045 */ 3046 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) 3047 { 3048 struct ceph_mds_client *mdsc = session->s_mdsc; 3049 struct ceph_mds_request *req; 3050 struct ceph_mds_reply_head *head = msg->front.iov_base; 3051 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ 3052 struct ceph_snap_realm *realm; 3053 u64 tid; 3054 int err, result; 3055 int mds = session->s_mds; 3056 3057 if (msg->front.iov_len < sizeof(*head)) { 3058 pr_err("mdsc_handle_reply got corrupt (short) reply\n"); 3059 ceph_msg_dump(msg); 3060 return; 3061 } 3062 3063 /* get request, session */ 3064 tid = le64_to_cpu(msg->hdr.tid); 3065 mutex_lock(&mdsc->mutex); 3066 req = lookup_get_request(mdsc, tid); 3067 if (!req) { 3068 dout("handle_reply on unknown tid %llu\n", tid); 3069 mutex_unlock(&mdsc->mutex); 3070 return; 3071 } 3072 dout("handle_reply %p\n", req); 3073 3074 /* correct session? */ 3075 if (req->r_session != session) { 3076 pr_err("mdsc_handle_reply got %llu on session mds%d" 3077 " not mds%d\n", tid, session->s_mds, 3078 req->r_session ? req->r_session->s_mds : -1); 3079 mutex_unlock(&mdsc->mutex); 3080 goto out; 3081 } 3082 3083 /* dup? */ 3084 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) || 3085 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) { 3086 pr_warn("got a dup %s reply on %llu from mds%d\n", 3087 head->safe ? "safe" : "unsafe", tid, mds); 3088 mutex_unlock(&mdsc->mutex); 3089 goto out; 3090 } 3091 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) { 3092 pr_warn("got unsafe after safe on %llu from mds%d\n", 3093 tid, mds); 3094 mutex_unlock(&mdsc->mutex); 3095 goto out; 3096 } 3097 3098 result = le32_to_cpu(head->result); 3099 3100 /* 3101 * Handle an ESTALE 3102 * if we're not talking to the authority, send to them 3103 * if the authority has changed while we weren't looking, 3104 * send to new authority 3105 * Otherwise we just have to return an ESTALE 3106 */ 3107 if (result == -ESTALE) { 3108 dout("got ESTALE on request %llu\n", req->r_tid); 3109 req->r_resend_mds = -1; 3110 if (req->r_direct_mode != USE_AUTH_MDS) { 3111 dout("not using auth, setting for that now\n"); 3112 req->r_direct_mode = USE_AUTH_MDS; 3113 __do_request(mdsc, req); 3114 mutex_unlock(&mdsc->mutex); 3115 goto out; 3116 } else { 3117 int mds = __choose_mds(mdsc, req, NULL); 3118 if (mds >= 0 && mds != req->r_session->s_mds) { 3119 dout("but auth changed, so resending\n"); 3120 __do_request(mdsc, req); 3121 mutex_unlock(&mdsc->mutex); 3122 goto out; 3123 } 3124 } 3125 dout("have to return ESTALE on request %llu\n", req->r_tid); 3126 } 3127 3128 3129 if (head->safe) { 3130 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags); 3131 __unregister_request(mdsc, req); 3132 3133 /* last request during umount? */ 3134 if (mdsc->stopping && !__get_oldest_req(mdsc)) 3135 complete_all(&mdsc->safe_umount_waiters); 3136 3137 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 3138 /* 3139 * We already handled the unsafe response, now do the 3140 * cleanup. No need to examine the response; the MDS 3141 * doesn't include any result info in the safe 3142 * response. And even if it did, there is nothing 3143 * useful we could do with a revised return value. 3144 */ 3145 dout("got safe reply %llu, mds%d\n", tid, mds); 3146 3147 mutex_unlock(&mdsc->mutex); 3148 goto out; 3149 } 3150 } else { 3151 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags); 3152 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); 3153 } 3154 3155 dout("handle_reply tid %lld result %d\n", tid, result); 3156 rinfo = &req->r_reply_info; 3157 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features)) 3158 err = parse_reply_info(session, msg, rinfo, (u64)-1); 3159 else 3160 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features); 3161 mutex_unlock(&mdsc->mutex); 3162 3163 /* Must find target inode outside of mutexes to avoid deadlocks */ 3164 if ((err >= 0) && rinfo->head->is_target) { 3165 struct inode *in; 3166 struct ceph_vino tvino = { 3167 .ino = le64_to_cpu(rinfo->targeti.in->ino), 3168 .snap = le64_to_cpu(rinfo->targeti.in->snapid) 3169 }; 3170 3171 in = ceph_get_inode(mdsc->fsc->sb, tvino); 3172 if (IS_ERR(in)) { 3173 err = PTR_ERR(in); 3174 mutex_lock(&session->s_mutex); 3175 goto out_err; 3176 } 3177 req->r_target_inode = in; 3178 } 3179 3180 mutex_lock(&session->s_mutex); 3181 if (err < 0) { 3182 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); 3183 ceph_msg_dump(msg); 3184 goto out_err; 3185 } 3186 3187 /* snap trace */ 3188 realm = NULL; 3189 if (rinfo->snapblob_len) { 3190 down_write(&mdsc->snap_rwsem); 3191 ceph_update_snap_trace(mdsc, rinfo->snapblob, 3192 rinfo->snapblob + rinfo->snapblob_len, 3193 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, 3194 &realm); 3195 downgrade_write(&mdsc->snap_rwsem); 3196 } else { 3197 down_read(&mdsc->snap_rwsem); 3198 } 3199 3200 /* insert trace into our cache */ 3201 mutex_lock(&req->r_fill_mutex); 3202 current->journal_info = req; 3203 err = ceph_fill_trace(mdsc->fsc->sb, req); 3204 if (err == 0) { 3205 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || 3206 req->r_op == CEPH_MDS_OP_LSSNAP)) 3207 ceph_readdir_prepopulate(req, req->r_session); 3208 } 3209 current->journal_info = NULL; 3210 mutex_unlock(&req->r_fill_mutex); 3211 3212 up_read(&mdsc->snap_rwsem); 3213 if (realm) 3214 ceph_put_snap_realm(mdsc, realm); 3215 3216 if (err == 0) { 3217 if (req->r_target_inode && 3218 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 3219 struct ceph_inode_info *ci = 3220 ceph_inode(req->r_target_inode); 3221 spin_lock(&ci->i_unsafe_lock); 3222 list_add_tail(&req->r_unsafe_target_item, 3223 &ci->i_unsafe_iops); 3224 spin_unlock(&ci->i_unsafe_lock); 3225 } 3226 3227 ceph_unreserve_caps(mdsc, &req->r_caps_reservation); 3228 } 3229 out_err: 3230 mutex_lock(&mdsc->mutex); 3231 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 3232 if (err) { 3233 req->r_err = err; 3234 } else { 3235 req->r_reply = ceph_msg_get(msg); 3236 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags); 3237 } 3238 } else { 3239 dout("reply arrived after request %lld was aborted\n", tid); 3240 } 3241 mutex_unlock(&mdsc->mutex); 3242 3243 mutex_unlock(&session->s_mutex); 3244 3245 /* kick calling process */ 3246 complete_request(mdsc, req); 3247 3248 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency, 3249 req->r_end_latency, err); 3250 out: 3251 ceph_mdsc_put_request(req); 3252 return; 3253 } 3254 3255 3256 3257 /* 3258 * handle mds notification that our request has been forwarded. 3259 */ 3260 static void handle_forward(struct ceph_mds_client *mdsc, 3261 struct ceph_mds_session *session, 3262 struct ceph_msg *msg) 3263 { 3264 struct ceph_mds_request *req; 3265 u64 tid = le64_to_cpu(msg->hdr.tid); 3266 u32 next_mds; 3267 u32 fwd_seq; 3268 int err = -EINVAL; 3269 void *p = msg->front.iov_base; 3270 void *end = p + msg->front.iov_len; 3271 3272 ceph_decode_need(&p, end, 2*sizeof(u32), bad); 3273 next_mds = ceph_decode_32(&p); 3274 fwd_seq = ceph_decode_32(&p); 3275 3276 mutex_lock(&mdsc->mutex); 3277 req = lookup_get_request(mdsc, tid); 3278 if (!req) { 3279 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); 3280 goto out; /* dup reply? */ 3281 } 3282 3283 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 3284 dout("forward tid %llu aborted, unregistering\n", tid); 3285 __unregister_request(mdsc, req); 3286 } else if (fwd_seq <= req->r_num_fwd) { 3287 dout("forward tid %llu to mds%d - old seq %d <= %d\n", 3288 tid, next_mds, req->r_num_fwd, fwd_seq); 3289 } else { 3290 /* resend. forward race not possible; mds would drop */ 3291 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); 3292 BUG_ON(req->r_err); 3293 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)); 3294 req->r_attempts = 0; 3295 req->r_num_fwd = fwd_seq; 3296 req->r_resend_mds = next_mds; 3297 put_request_session(req); 3298 __do_request(mdsc, req); 3299 } 3300 ceph_mdsc_put_request(req); 3301 out: 3302 mutex_unlock(&mdsc->mutex); 3303 return; 3304 3305 bad: 3306 pr_err("mdsc_handle_forward decode error err=%d\n", err); 3307 } 3308 3309 static int __decode_session_metadata(void **p, void *end, 3310 bool *blocklisted) 3311 { 3312 /* map<string,string> */ 3313 u32 n; 3314 bool err_str; 3315 ceph_decode_32_safe(p, end, n, bad); 3316 while (n-- > 0) { 3317 u32 len; 3318 ceph_decode_32_safe(p, end, len, bad); 3319 ceph_decode_need(p, end, len, bad); 3320 err_str = !strncmp(*p, "error_string", len); 3321 *p += len; 3322 ceph_decode_32_safe(p, end, len, bad); 3323 ceph_decode_need(p, end, len, bad); 3324 /* 3325 * Match "blocklisted (blacklisted)" from newer MDSes, 3326 * or "blacklisted" from older MDSes. 3327 */ 3328 if (err_str && strnstr(*p, "blacklisted", len)) 3329 *blocklisted = true; 3330 *p += len; 3331 } 3332 return 0; 3333 bad: 3334 return -1; 3335 } 3336 3337 /* 3338 * handle a mds session control message 3339 */ 3340 static void handle_session(struct ceph_mds_session *session, 3341 struct ceph_msg *msg) 3342 { 3343 struct ceph_mds_client *mdsc = session->s_mdsc; 3344 int mds = session->s_mds; 3345 int msg_version = le16_to_cpu(msg->hdr.version); 3346 void *p = msg->front.iov_base; 3347 void *end = p + msg->front.iov_len; 3348 struct ceph_mds_session_head *h; 3349 u32 op; 3350 u64 seq, features = 0; 3351 int wake = 0; 3352 bool blocklisted = false; 3353 3354 /* decode */ 3355 ceph_decode_need(&p, end, sizeof(*h), bad); 3356 h = p; 3357 p += sizeof(*h); 3358 3359 op = le32_to_cpu(h->op); 3360 seq = le64_to_cpu(h->seq); 3361 3362 if (msg_version >= 3) { 3363 u32 len; 3364 /* version >= 2 and < 5, decode metadata, skip otherwise 3365 * as it's handled via flags. 3366 */ 3367 if (msg_version >= 5) 3368 ceph_decode_skip_map(&p, end, string, string, bad); 3369 else if (__decode_session_metadata(&p, end, &blocklisted) < 0) 3370 goto bad; 3371 3372 /* version >= 3, feature bits */ 3373 ceph_decode_32_safe(&p, end, len, bad); 3374 if (len) { 3375 ceph_decode_64_safe(&p, end, features, bad); 3376 p += len - sizeof(features); 3377 } 3378 } 3379 3380 if (msg_version >= 5) { 3381 u32 flags; 3382 /* version >= 4, struct_v, struct_cv, len, metric_spec */ 3383 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 2, bad); 3384 /* version >= 5, flags */ 3385 ceph_decode_32_safe(&p, end, flags, bad); 3386 if (flags & CEPH_SESSION_BLOCKLISTED) { 3387 pr_warn("mds%d session blocklisted\n", session->s_mds); 3388 blocklisted = true; 3389 } 3390 } 3391 3392 mutex_lock(&mdsc->mutex); 3393 if (op == CEPH_SESSION_CLOSE) { 3394 ceph_get_mds_session(session); 3395 __unregister_session(mdsc, session); 3396 } 3397 /* FIXME: this ttl calculation is generous */ 3398 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; 3399 mutex_unlock(&mdsc->mutex); 3400 3401 mutex_lock(&session->s_mutex); 3402 3403 dout("handle_session mds%d %s %p state %s seq %llu\n", 3404 mds, ceph_session_op_name(op), session, 3405 ceph_session_state_name(session->s_state), seq); 3406 3407 if (session->s_state == CEPH_MDS_SESSION_HUNG) { 3408 session->s_state = CEPH_MDS_SESSION_OPEN; 3409 pr_info("mds%d came back\n", session->s_mds); 3410 } 3411 3412 switch (op) { 3413 case CEPH_SESSION_OPEN: 3414 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 3415 pr_info("mds%d reconnect success\n", session->s_mds); 3416 session->s_state = CEPH_MDS_SESSION_OPEN; 3417 session->s_features = features; 3418 renewed_caps(mdsc, session, 0); 3419 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features)) 3420 metric_schedule_delayed(&mdsc->metric); 3421 wake = 1; 3422 if (mdsc->stopping) 3423 __close_session(mdsc, session); 3424 break; 3425 3426 case CEPH_SESSION_RENEWCAPS: 3427 if (session->s_renew_seq == seq) 3428 renewed_caps(mdsc, session, 1); 3429 break; 3430 3431 case CEPH_SESSION_CLOSE: 3432 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 3433 pr_info("mds%d reconnect denied\n", session->s_mds); 3434 session->s_state = CEPH_MDS_SESSION_CLOSED; 3435 cleanup_session_requests(mdsc, session); 3436 remove_session_caps(session); 3437 wake = 2; /* for good measure */ 3438 wake_up_all(&mdsc->session_close_wq); 3439 break; 3440 3441 case CEPH_SESSION_STALE: 3442 pr_info("mds%d caps went stale, renewing\n", 3443 session->s_mds); 3444 atomic_inc(&session->s_cap_gen); 3445 session->s_cap_ttl = jiffies - 1; 3446 send_renew_caps(mdsc, session); 3447 break; 3448 3449 case CEPH_SESSION_RECALL_STATE: 3450 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); 3451 break; 3452 3453 case CEPH_SESSION_FLUSHMSG: 3454 send_flushmsg_ack(mdsc, session, seq); 3455 break; 3456 3457 case CEPH_SESSION_FORCE_RO: 3458 dout("force_session_readonly %p\n", session); 3459 spin_lock(&session->s_cap_lock); 3460 session->s_readonly = true; 3461 spin_unlock(&session->s_cap_lock); 3462 wake_up_session_caps(session, FORCE_RO); 3463 break; 3464 3465 case CEPH_SESSION_REJECT: 3466 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING); 3467 pr_info("mds%d rejected session\n", session->s_mds); 3468 session->s_state = CEPH_MDS_SESSION_REJECTED; 3469 cleanup_session_requests(mdsc, session); 3470 remove_session_caps(session); 3471 if (blocklisted) 3472 mdsc->fsc->blocklisted = true; 3473 wake = 2; /* for good measure */ 3474 break; 3475 3476 default: 3477 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); 3478 WARN_ON(1); 3479 } 3480 3481 mutex_unlock(&session->s_mutex); 3482 if (wake) { 3483 mutex_lock(&mdsc->mutex); 3484 __wake_requests(mdsc, &session->s_waiting); 3485 if (wake == 2) 3486 kick_requests(mdsc, mds); 3487 mutex_unlock(&mdsc->mutex); 3488 } 3489 if (op == CEPH_SESSION_CLOSE) 3490 ceph_put_mds_session(session); 3491 return; 3492 3493 bad: 3494 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, 3495 (int)msg->front.iov_len); 3496 ceph_msg_dump(msg); 3497 return; 3498 } 3499 3500 void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req) 3501 { 3502 int dcaps; 3503 3504 dcaps = xchg(&req->r_dir_caps, 0); 3505 if (dcaps) { 3506 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); 3507 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps); 3508 } 3509 } 3510 3511 void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req) 3512 { 3513 int dcaps; 3514 3515 dcaps = xchg(&req->r_dir_caps, 0); 3516 if (dcaps) { 3517 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); 3518 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent), 3519 dcaps); 3520 } 3521 } 3522 3523 /* 3524 * called under session->mutex. 3525 */ 3526 static void replay_unsafe_requests(struct ceph_mds_client *mdsc, 3527 struct ceph_mds_session *session) 3528 { 3529 struct ceph_mds_request *req, *nreq; 3530 struct rb_node *p; 3531 3532 dout("replay_unsafe_requests mds%d\n", session->s_mds); 3533 3534 mutex_lock(&mdsc->mutex); 3535 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) 3536 __send_request(session, req, true); 3537 3538 /* 3539 * also re-send old requests when MDS enters reconnect stage. So that MDS 3540 * can process completed request in clientreplay stage. 3541 */ 3542 p = rb_first(&mdsc->request_tree); 3543 while (p) { 3544 req = rb_entry(p, struct ceph_mds_request, r_node); 3545 p = rb_next(p); 3546 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 3547 continue; 3548 if (req->r_attempts == 0) 3549 continue; /* only old requests */ 3550 if (!req->r_session) 3551 continue; 3552 if (req->r_session->s_mds != session->s_mds) 3553 continue; 3554 3555 ceph_mdsc_release_dir_caps_no_check(req); 3556 3557 __send_request(session, req, true); 3558 } 3559 mutex_unlock(&mdsc->mutex); 3560 } 3561 3562 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state) 3563 { 3564 struct ceph_msg *reply; 3565 struct ceph_pagelist *_pagelist; 3566 struct page *page; 3567 __le32 *addr; 3568 int err = -ENOMEM; 3569 3570 if (!recon_state->allow_multi) 3571 return -ENOSPC; 3572 3573 /* can't handle message that contains both caps and realm */ 3574 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms); 3575 3576 /* pre-allocate new pagelist */ 3577 _pagelist = ceph_pagelist_alloc(GFP_NOFS); 3578 if (!_pagelist) 3579 return -ENOMEM; 3580 3581 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); 3582 if (!reply) 3583 goto fail_msg; 3584 3585 /* placeholder for nr_caps */ 3586 err = ceph_pagelist_encode_32(_pagelist, 0); 3587 if (err < 0) 3588 goto fail; 3589 3590 if (recon_state->nr_caps) { 3591 /* currently encoding caps */ 3592 err = ceph_pagelist_encode_32(recon_state->pagelist, 0); 3593 if (err) 3594 goto fail; 3595 } else { 3596 /* placeholder for nr_realms (currently encoding relams) */ 3597 err = ceph_pagelist_encode_32(_pagelist, 0); 3598 if (err < 0) 3599 goto fail; 3600 } 3601 3602 err = ceph_pagelist_encode_8(recon_state->pagelist, 1); 3603 if (err) 3604 goto fail; 3605 3606 page = list_first_entry(&recon_state->pagelist->head, struct page, lru); 3607 addr = kmap_atomic(page); 3608 if (recon_state->nr_caps) { 3609 /* currently encoding caps */ 3610 *addr = cpu_to_le32(recon_state->nr_caps); 3611 } else { 3612 /* currently encoding relams */ 3613 *(addr + 1) = cpu_to_le32(recon_state->nr_realms); 3614 } 3615 kunmap_atomic(addr); 3616 3617 reply->hdr.version = cpu_to_le16(5); 3618 reply->hdr.compat_version = cpu_to_le16(4); 3619 3620 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length); 3621 ceph_msg_data_add_pagelist(reply, recon_state->pagelist); 3622 3623 ceph_con_send(&recon_state->session->s_con, reply); 3624 ceph_pagelist_release(recon_state->pagelist); 3625 3626 recon_state->pagelist = _pagelist; 3627 recon_state->nr_caps = 0; 3628 recon_state->nr_realms = 0; 3629 recon_state->msg_version = 5; 3630 return 0; 3631 fail: 3632 ceph_msg_put(reply); 3633 fail_msg: 3634 ceph_pagelist_release(_pagelist); 3635 return err; 3636 } 3637 3638 static struct dentry* d_find_primary(struct inode *inode) 3639 { 3640 struct dentry *alias, *dn = NULL; 3641 3642 if (hlist_empty(&inode->i_dentry)) 3643 return NULL; 3644 3645 spin_lock(&inode->i_lock); 3646 if (hlist_empty(&inode->i_dentry)) 3647 goto out_unlock; 3648 3649 if (S_ISDIR(inode->i_mode)) { 3650 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias); 3651 if (!IS_ROOT(alias)) 3652 dn = dget(alias); 3653 goto out_unlock; 3654 } 3655 3656 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 3657 spin_lock(&alias->d_lock); 3658 if (!d_unhashed(alias) && 3659 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) { 3660 dn = dget_dlock(alias); 3661 } 3662 spin_unlock(&alias->d_lock); 3663 if (dn) 3664 break; 3665 } 3666 out_unlock: 3667 spin_unlock(&inode->i_lock); 3668 return dn; 3669 } 3670 3671 /* 3672 * Encode information about a cap for a reconnect with the MDS. 3673 */ 3674 static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap, 3675 void *arg) 3676 { 3677 union { 3678 struct ceph_mds_cap_reconnect v2; 3679 struct ceph_mds_cap_reconnect_v1 v1; 3680 } rec; 3681 struct ceph_inode_info *ci = cap->ci; 3682 struct ceph_reconnect_state *recon_state = arg; 3683 struct ceph_pagelist *pagelist = recon_state->pagelist; 3684 struct dentry *dentry; 3685 char *path; 3686 int pathlen, err; 3687 u64 pathbase; 3688 u64 snap_follows; 3689 3690 dout(" adding %p ino %llx.%llx cap %p %lld %s\n", 3691 inode, ceph_vinop(inode), cap, cap->cap_id, 3692 ceph_cap_string(cap->issued)); 3693 3694 dentry = d_find_primary(inode); 3695 if (dentry) { 3696 /* set pathbase to parent dir when msg_version >= 2 */ 3697 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 3698 recon_state->msg_version >= 2); 3699 dput(dentry); 3700 if (IS_ERR(path)) { 3701 err = PTR_ERR(path); 3702 goto out_err; 3703 } 3704 } else { 3705 path = NULL; 3706 pathlen = 0; 3707 pathbase = 0; 3708 } 3709 3710 spin_lock(&ci->i_ceph_lock); 3711 cap->seq = 0; /* reset cap seq */ 3712 cap->issue_seq = 0; /* and issue_seq */ 3713 cap->mseq = 0; /* and migrate_seq */ 3714 cap->cap_gen = atomic_read(&cap->session->s_cap_gen); 3715 3716 /* These are lost when the session goes away */ 3717 if (S_ISDIR(inode->i_mode)) { 3718 if (cap->issued & CEPH_CAP_DIR_CREATE) { 3719 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); 3720 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); 3721 } 3722 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS; 3723 } 3724 3725 if (recon_state->msg_version >= 2) { 3726 rec.v2.cap_id = cpu_to_le64(cap->cap_id); 3727 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 3728 rec.v2.issued = cpu_to_le32(cap->issued); 3729 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 3730 rec.v2.pathbase = cpu_to_le64(pathbase); 3731 rec.v2.flock_len = (__force __le32) 3732 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1); 3733 } else { 3734 rec.v1.cap_id = cpu_to_le64(cap->cap_id); 3735 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 3736 rec.v1.issued = cpu_to_le32(cap->issued); 3737 rec.v1.size = cpu_to_le64(i_size_read(inode)); 3738 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime); 3739 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime); 3740 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 3741 rec.v1.pathbase = cpu_to_le64(pathbase); 3742 } 3743 3744 if (list_empty(&ci->i_cap_snaps)) { 3745 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0; 3746 } else { 3747 struct ceph_cap_snap *capsnap = 3748 list_first_entry(&ci->i_cap_snaps, 3749 struct ceph_cap_snap, ci_item); 3750 snap_follows = capsnap->follows; 3751 } 3752 spin_unlock(&ci->i_ceph_lock); 3753 3754 if (recon_state->msg_version >= 2) { 3755 int num_fcntl_locks, num_flock_locks; 3756 struct ceph_filelock *flocks = NULL; 3757 size_t struct_len, total_len = sizeof(u64); 3758 u8 struct_v = 0; 3759 3760 encode_again: 3761 if (rec.v2.flock_len) { 3762 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); 3763 } else { 3764 num_fcntl_locks = 0; 3765 num_flock_locks = 0; 3766 } 3767 if (num_fcntl_locks + num_flock_locks > 0) { 3768 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks, 3769 sizeof(struct ceph_filelock), 3770 GFP_NOFS); 3771 if (!flocks) { 3772 err = -ENOMEM; 3773 goto out_err; 3774 } 3775 err = ceph_encode_locks_to_buffer(inode, flocks, 3776 num_fcntl_locks, 3777 num_flock_locks); 3778 if (err) { 3779 kfree(flocks); 3780 flocks = NULL; 3781 if (err == -ENOSPC) 3782 goto encode_again; 3783 goto out_err; 3784 } 3785 } else { 3786 kfree(flocks); 3787 flocks = NULL; 3788 } 3789 3790 if (recon_state->msg_version >= 3) { 3791 /* version, compat_version and struct_len */ 3792 total_len += 2 * sizeof(u8) + sizeof(u32); 3793 struct_v = 2; 3794 } 3795 /* 3796 * number of encoded locks is stable, so copy to pagelist 3797 */ 3798 struct_len = 2 * sizeof(u32) + 3799 (num_fcntl_locks + num_flock_locks) * 3800 sizeof(struct ceph_filelock); 3801 rec.v2.flock_len = cpu_to_le32(struct_len); 3802 3803 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2); 3804 3805 if (struct_v >= 2) 3806 struct_len += sizeof(u64); /* snap_follows */ 3807 3808 total_len += struct_len; 3809 3810 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) { 3811 err = send_reconnect_partial(recon_state); 3812 if (err) 3813 goto out_freeflocks; 3814 pagelist = recon_state->pagelist; 3815 } 3816 3817 err = ceph_pagelist_reserve(pagelist, total_len); 3818 if (err) 3819 goto out_freeflocks; 3820 3821 ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); 3822 if (recon_state->msg_version >= 3) { 3823 ceph_pagelist_encode_8(pagelist, struct_v); 3824 ceph_pagelist_encode_8(pagelist, 1); 3825 ceph_pagelist_encode_32(pagelist, struct_len); 3826 } 3827 ceph_pagelist_encode_string(pagelist, path, pathlen); 3828 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2)); 3829 ceph_locks_to_pagelist(flocks, pagelist, 3830 num_fcntl_locks, num_flock_locks); 3831 if (struct_v >= 2) 3832 ceph_pagelist_encode_64(pagelist, snap_follows); 3833 out_freeflocks: 3834 kfree(flocks); 3835 } else { 3836 err = ceph_pagelist_reserve(pagelist, 3837 sizeof(u64) + sizeof(u32) + 3838 pathlen + sizeof(rec.v1)); 3839 if (err) 3840 goto out_err; 3841 3842 ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); 3843 ceph_pagelist_encode_string(pagelist, path, pathlen); 3844 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1)); 3845 } 3846 3847 out_err: 3848 ceph_mdsc_free_path(path, pathlen); 3849 if (!err) 3850 recon_state->nr_caps++; 3851 return err; 3852 } 3853 3854 static int encode_snap_realms(struct ceph_mds_client *mdsc, 3855 struct ceph_reconnect_state *recon_state) 3856 { 3857 struct rb_node *p; 3858 struct ceph_pagelist *pagelist = recon_state->pagelist; 3859 int err = 0; 3860 3861 if (recon_state->msg_version >= 4) { 3862 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms); 3863 if (err < 0) 3864 goto fail; 3865 } 3866 3867 /* 3868 * snaprealms. we provide mds with the ino, seq (version), and 3869 * parent for all of our realms. If the mds has any newer info, 3870 * it will tell us. 3871 */ 3872 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { 3873 struct ceph_snap_realm *realm = 3874 rb_entry(p, struct ceph_snap_realm, node); 3875 struct ceph_mds_snaprealm_reconnect sr_rec; 3876 3877 if (recon_state->msg_version >= 4) { 3878 size_t need = sizeof(u8) * 2 + sizeof(u32) + 3879 sizeof(sr_rec); 3880 3881 if (pagelist->length + need > RECONNECT_MAX_SIZE) { 3882 err = send_reconnect_partial(recon_state); 3883 if (err) 3884 goto fail; 3885 pagelist = recon_state->pagelist; 3886 } 3887 3888 err = ceph_pagelist_reserve(pagelist, need); 3889 if (err) 3890 goto fail; 3891 3892 ceph_pagelist_encode_8(pagelist, 1); 3893 ceph_pagelist_encode_8(pagelist, 1); 3894 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec)); 3895 } 3896 3897 dout(" adding snap realm %llx seq %lld parent %llx\n", 3898 realm->ino, realm->seq, realm->parent_ino); 3899 sr_rec.ino = cpu_to_le64(realm->ino); 3900 sr_rec.seq = cpu_to_le64(realm->seq); 3901 sr_rec.parent = cpu_to_le64(realm->parent_ino); 3902 3903 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); 3904 if (err) 3905 goto fail; 3906 3907 recon_state->nr_realms++; 3908 } 3909 fail: 3910 return err; 3911 } 3912 3913 3914 /* 3915 * If an MDS fails and recovers, clients need to reconnect in order to 3916 * reestablish shared state. This includes all caps issued through 3917 * this session _and_ the snap_realm hierarchy. Because it's not 3918 * clear which snap realms the mds cares about, we send everything we 3919 * know about.. that ensures we'll then get any new info the 3920 * recovering MDS might have. 3921 * 3922 * This is a relatively heavyweight operation, but it's rare. 3923 */ 3924 static void send_mds_reconnect(struct ceph_mds_client *mdsc, 3925 struct ceph_mds_session *session) 3926 { 3927 struct ceph_msg *reply; 3928 int mds = session->s_mds; 3929 int err = -ENOMEM; 3930 struct ceph_reconnect_state recon_state = { 3931 .session = session, 3932 }; 3933 LIST_HEAD(dispose); 3934 3935 pr_info("mds%d reconnect start\n", mds); 3936 3937 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS); 3938 if (!recon_state.pagelist) 3939 goto fail_nopagelist; 3940 3941 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); 3942 if (!reply) 3943 goto fail_nomsg; 3944 3945 xa_destroy(&session->s_delegated_inos); 3946 3947 mutex_lock(&session->s_mutex); 3948 session->s_state = CEPH_MDS_SESSION_RECONNECTING; 3949 session->s_seq = 0; 3950 3951 dout("session %p state %s\n", session, 3952 ceph_session_state_name(session->s_state)); 3953 3954 atomic_inc(&session->s_cap_gen); 3955 3956 spin_lock(&session->s_cap_lock); 3957 /* don't know if session is readonly */ 3958 session->s_readonly = 0; 3959 /* 3960 * notify __ceph_remove_cap() that we are composing cap reconnect. 3961 * If a cap get released before being added to the cap reconnect, 3962 * __ceph_remove_cap() should skip queuing cap release. 3963 */ 3964 session->s_cap_reconnect = 1; 3965 /* drop old cap expires; we're about to reestablish that state */ 3966 detach_cap_releases(session, &dispose); 3967 spin_unlock(&session->s_cap_lock); 3968 dispose_cap_releases(mdsc, &dispose); 3969 3970 /* trim unused caps to reduce MDS's cache rejoin time */ 3971 if (mdsc->fsc->sb->s_root) 3972 shrink_dcache_parent(mdsc->fsc->sb->s_root); 3973 3974 ceph_con_close(&session->s_con); 3975 ceph_con_open(&session->s_con, 3976 CEPH_ENTITY_TYPE_MDS, mds, 3977 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 3978 3979 /* replay unsafe requests */ 3980 replay_unsafe_requests(mdsc, session); 3981 3982 ceph_early_kick_flushing_caps(mdsc, session); 3983 3984 down_read(&mdsc->snap_rwsem); 3985 3986 /* placeholder for nr_caps */ 3987 err = ceph_pagelist_encode_32(recon_state.pagelist, 0); 3988 if (err) 3989 goto fail; 3990 3991 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) { 3992 recon_state.msg_version = 3; 3993 recon_state.allow_multi = true; 3994 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) { 3995 recon_state.msg_version = 3; 3996 } else { 3997 recon_state.msg_version = 2; 3998 } 3999 /* trsaverse this session's caps */ 4000 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state); 4001 4002 spin_lock(&session->s_cap_lock); 4003 session->s_cap_reconnect = 0; 4004 spin_unlock(&session->s_cap_lock); 4005 4006 if (err < 0) 4007 goto fail; 4008 4009 /* check if all realms can be encoded into current message */ 4010 if (mdsc->num_snap_realms) { 4011 size_t total_len = 4012 recon_state.pagelist->length + 4013 mdsc->num_snap_realms * 4014 sizeof(struct ceph_mds_snaprealm_reconnect); 4015 if (recon_state.msg_version >= 4) { 4016 /* number of realms */ 4017 total_len += sizeof(u32); 4018 /* version, compat_version and struct_len */ 4019 total_len += mdsc->num_snap_realms * 4020 (2 * sizeof(u8) + sizeof(u32)); 4021 } 4022 if (total_len > RECONNECT_MAX_SIZE) { 4023 if (!recon_state.allow_multi) { 4024 err = -ENOSPC; 4025 goto fail; 4026 } 4027 if (recon_state.nr_caps) { 4028 err = send_reconnect_partial(&recon_state); 4029 if (err) 4030 goto fail; 4031 } 4032 recon_state.msg_version = 5; 4033 } 4034 } 4035 4036 err = encode_snap_realms(mdsc, &recon_state); 4037 if (err < 0) 4038 goto fail; 4039 4040 if (recon_state.msg_version >= 5) { 4041 err = ceph_pagelist_encode_8(recon_state.pagelist, 0); 4042 if (err < 0) 4043 goto fail; 4044 } 4045 4046 if (recon_state.nr_caps || recon_state.nr_realms) { 4047 struct page *page = 4048 list_first_entry(&recon_state.pagelist->head, 4049 struct page, lru); 4050 __le32 *addr = kmap_atomic(page); 4051 if (recon_state.nr_caps) { 4052 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms); 4053 *addr = cpu_to_le32(recon_state.nr_caps); 4054 } else if (recon_state.msg_version >= 4) { 4055 *(addr + 1) = cpu_to_le32(recon_state.nr_realms); 4056 } 4057 kunmap_atomic(addr); 4058 } 4059 4060 reply->hdr.version = cpu_to_le16(recon_state.msg_version); 4061 if (recon_state.msg_version >= 4) 4062 reply->hdr.compat_version = cpu_to_le16(4); 4063 4064 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length); 4065 ceph_msg_data_add_pagelist(reply, recon_state.pagelist); 4066 4067 ceph_con_send(&session->s_con, reply); 4068 4069 mutex_unlock(&session->s_mutex); 4070 4071 mutex_lock(&mdsc->mutex); 4072 __wake_requests(mdsc, &session->s_waiting); 4073 mutex_unlock(&mdsc->mutex); 4074 4075 up_read(&mdsc->snap_rwsem); 4076 ceph_pagelist_release(recon_state.pagelist); 4077 return; 4078 4079 fail: 4080 ceph_msg_put(reply); 4081 up_read(&mdsc->snap_rwsem); 4082 mutex_unlock(&session->s_mutex); 4083 fail_nomsg: 4084 ceph_pagelist_release(recon_state.pagelist); 4085 fail_nopagelist: 4086 pr_err("error %d preparing reconnect for mds%d\n", err, mds); 4087 return; 4088 } 4089 4090 4091 /* 4092 * compare old and new mdsmaps, kicking requests 4093 * and closing out old connections as necessary 4094 * 4095 * called under mdsc->mutex. 4096 */ 4097 static void check_new_map(struct ceph_mds_client *mdsc, 4098 struct ceph_mdsmap *newmap, 4099 struct ceph_mdsmap *oldmap) 4100 { 4101 int i, j, err; 4102 int oldstate, newstate; 4103 struct ceph_mds_session *s; 4104 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0}; 4105 4106 dout("check_new_map new %u old %u\n", 4107 newmap->m_epoch, oldmap->m_epoch); 4108 4109 if (newmap->m_info) { 4110 for (i = 0; i < newmap->possible_max_rank; i++) { 4111 for (j = 0; j < newmap->m_info[i].num_export_targets; j++) 4112 set_bit(newmap->m_info[i].export_targets[j], targets); 4113 } 4114 } 4115 4116 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) { 4117 if (!mdsc->sessions[i]) 4118 continue; 4119 s = mdsc->sessions[i]; 4120 oldstate = ceph_mdsmap_get_state(oldmap, i); 4121 newstate = ceph_mdsmap_get_state(newmap, i); 4122 4123 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", 4124 i, ceph_mds_state_name(oldstate), 4125 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", 4126 ceph_mds_state_name(newstate), 4127 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", 4128 ceph_session_state_name(s->s_state)); 4129 4130 if (i >= newmap->possible_max_rank) { 4131 /* force close session for stopped mds */ 4132 ceph_get_mds_session(s); 4133 __unregister_session(mdsc, s); 4134 __wake_requests(mdsc, &s->s_waiting); 4135 mutex_unlock(&mdsc->mutex); 4136 4137 mutex_lock(&s->s_mutex); 4138 cleanup_session_requests(mdsc, s); 4139 remove_session_caps(s); 4140 mutex_unlock(&s->s_mutex); 4141 4142 ceph_put_mds_session(s); 4143 4144 mutex_lock(&mdsc->mutex); 4145 kick_requests(mdsc, i); 4146 continue; 4147 } 4148 4149 if (memcmp(ceph_mdsmap_get_addr(oldmap, i), 4150 ceph_mdsmap_get_addr(newmap, i), 4151 sizeof(struct ceph_entity_addr))) { 4152 /* just close it */ 4153 mutex_unlock(&mdsc->mutex); 4154 mutex_lock(&s->s_mutex); 4155 mutex_lock(&mdsc->mutex); 4156 ceph_con_close(&s->s_con); 4157 mutex_unlock(&s->s_mutex); 4158 s->s_state = CEPH_MDS_SESSION_RESTARTING; 4159 } else if (oldstate == newstate) { 4160 continue; /* nothing new with this mds */ 4161 } 4162 4163 /* 4164 * send reconnect? 4165 */ 4166 if (s->s_state == CEPH_MDS_SESSION_RESTARTING && 4167 newstate >= CEPH_MDS_STATE_RECONNECT) { 4168 mutex_unlock(&mdsc->mutex); 4169 clear_bit(i, targets); 4170 send_mds_reconnect(mdsc, s); 4171 mutex_lock(&mdsc->mutex); 4172 } 4173 4174 /* 4175 * kick request on any mds that has gone active. 4176 */ 4177 if (oldstate < CEPH_MDS_STATE_ACTIVE && 4178 newstate >= CEPH_MDS_STATE_ACTIVE) { 4179 if (oldstate != CEPH_MDS_STATE_CREATING && 4180 oldstate != CEPH_MDS_STATE_STARTING) 4181 pr_info("mds%d recovery completed\n", s->s_mds); 4182 kick_requests(mdsc, i); 4183 mutex_unlock(&mdsc->mutex); 4184 mutex_lock(&s->s_mutex); 4185 mutex_lock(&mdsc->mutex); 4186 ceph_kick_flushing_caps(mdsc, s); 4187 mutex_unlock(&s->s_mutex); 4188 wake_up_session_caps(s, RECONNECT); 4189 } 4190 } 4191 4192 /* 4193 * Only open and reconnect sessions that don't exist yet. 4194 */ 4195 for (i = 0; i < newmap->possible_max_rank; i++) { 4196 /* 4197 * In case the import MDS is crashed just after 4198 * the EImportStart journal is flushed, so when 4199 * a standby MDS takes over it and is replaying 4200 * the EImportStart journal the new MDS daemon 4201 * will wait the client to reconnect it, but the 4202 * client may never register/open the session yet. 4203 * 4204 * Will try to reconnect that MDS daemon if the 4205 * rank number is in the export targets array and 4206 * is the up:reconnect state. 4207 */ 4208 newstate = ceph_mdsmap_get_state(newmap, i); 4209 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT) 4210 continue; 4211 4212 /* 4213 * The session maybe registered and opened by some 4214 * requests which were choosing random MDSes during 4215 * the mdsc->mutex's unlock/lock gap below in rare 4216 * case. But the related MDS daemon will just queue 4217 * that requests and be still waiting for the client's 4218 * reconnection request in up:reconnect state. 4219 */ 4220 s = __ceph_lookup_mds_session(mdsc, i); 4221 if (likely(!s)) { 4222 s = __open_export_target_session(mdsc, i); 4223 if (IS_ERR(s)) { 4224 err = PTR_ERR(s); 4225 pr_err("failed to open export target session, err %d\n", 4226 err); 4227 continue; 4228 } 4229 } 4230 dout("send reconnect to export target mds.%d\n", i); 4231 mutex_unlock(&mdsc->mutex); 4232 send_mds_reconnect(mdsc, s); 4233 ceph_put_mds_session(s); 4234 mutex_lock(&mdsc->mutex); 4235 } 4236 4237 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) { 4238 s = mdsc->sessions[i]; 4239 if (!s) 4240 continue; 4241 if (!ceph_mdsmap_is_laggy(newmap, i)) 4242 continue; 4243 if (s->s_state == CEPH_MDS_SESSION_OPEN || 4244 s->s_state == CEPH_MDS_SESSION_HUNG || 4245 s->s_state == CEPH_MDS_SESSION_CLOSING) { 4246 dout(" connecting to export targets of laggy mds%d\n", 4247 i); 4248 __open_export_target_sessions(mdsc, s); 4249 } 4250 } 4251 } 4252 4253 4254 4255 /* 4256 * leases 4257 */ 4258 4259 /* 4260 * caller must hold session s_mutex, dentry->d_lock 4261 */ 4262 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) 4263 { 4264 struct ceph_dentry_info *di = ceph_dentry(dentry); 4265 4266 ceph_put_mds_session(di->lease_session); 4267 di->lease_session = NULL; 4268 } 4269 4270 static void handle_lease(struct ceph_mds_client *mdsc, 4271 struct ceph_mds_session *session, 4272 struct ceph_msg *msg) 4273 { 4274 struct super_block *sb = mdsc->fsc->sb; 4275 struct inode *inode; 4276 struct dentry *parent, *dentry; 4277 struct ceph_dentry_info *di; 4278 int mds = session->s_mds; 4279 struct ceph_mds_lease *h = msg->front.iov_base; 4280 u32 seq; 4281 struct ceph_vino vino; 4282 struct qstr dname; 4283 int release = 0; 4284 4285 dout("handle_lease from mds%d\n", mds); 4286 4287 /* decode */ 4288 if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) 4289 goto bad; 4290 vino.ino = le64_to_cpu(h->ino); 4291 vino.snap = CEPH_NOSNAP; 4292 seq = le32_to_cpu(h->seq); 4293 dname.len = get_unaligned_le32(h + 1); 4294 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len) 4295 goto bad; 4296 dname.name = (void *)(h + 1) + sizeof(u32); 4297 4298 /* lookup inode */ 4299 inode = ceph_find_inode(sb, vino); 4300 dout("handle_lease %s, ino %llx %p %.*s\n", 4301 ceph_lease_op_name(h->action), vino.ino, inode, 4302 dname.len, dname.name); 4303 4304 mutex_lock(&session->s_mutex); 4305 inc_session_sequence(session); 4306 4307 if (!inode) { 4308 dout("handle_lease no inode %llx\n", vino.ino); 4309 goto release; 4310 } 4311 4312 /* dentry */ 4313 parent = d_find_alias(inode); 4314 if (!parent) { 4315 dout("no parent dentry on inode %p\n", inode); 4316 WARN_ON(1); 4317 goto release; /* hrm... */ 4318 } 4319 dname.hash = full_name_hash(parent, dname.name, dname.len); 4320 dentry = d_lookup(parent, &dname); 4321 dput(parent); 4322 if (!dentry) 4323 goto release; 4324 4325 spin_lock(&dentry->d_lock); 4326 di = ceph_dentry(dentry); 4327 switch (h->action) { 4328 case CEPH_MDS_LEASE_REVOKE: 4329 if (di->lease_session == session) { 4330 if (ceph_seq_cmp(di->lease_seq, seq) > 0) 4331 h->seq = cpu_to_le32(di->lease_seq); 4332 __ceph_mdsc_drop_dentry_lease(dentry); 4333 } 4334 release = 1; 4335 break; 4336 4337 case CEPH_MDS_LEASE_RENEW: 4338 if (di->lease_session == session && 4339 di->lease_gen == atomic_read(&session->s_cap_gen) && 4340 di->lease_renew_from && 4341 di->lease_renew_after == 0) { 4342 unsigned long duration = 4343 msecs_to_jiffies(le32_to_cpu(h->duration_ms)); 4344 4345 di->lease_seq = seq; 4346 di->time = di->lease_renew_from + duration; 4347 di->lease_renew_after = di->lease_renew_from + 4348 (duration >> 1); 4349 di->lease_renew_from = 0; 4350 } 4351 break; 4352 } 4353 spin_unlock(&dentry->d_lock); 4354 dput(dentry); 4355 4356 if (!release) 4357 goto out; 4358 4359 release: 4360 /* let's just reuse the same message */ 4361 h->action = CEPH_MDS_LEASE_REVOKE_ACK; 4362 ceph_msg_get(msg); 4363 ceph_con_send(&session->s_con, msg); 4364 4365 out: 4366 mutex_unlock(&session->s_mutex); 4367 iput(inode); 4368 return; 4369 4370 bad: 4371 pr_err("corrupt lease message\n"); 4372 ceph_msg_dump(msg); 4373 } 4374 4375 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 4376 struct dentry *dentry, char action, 4377 u32 seq) 4378 { 4379 struct ceph_msg *msg; 4380 struct ceph_mds_lease *lease; 4381 struct inode *dir; 4382 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX; 4383 4384 dout("lease_send_msg identry %p %s to mds%d\n", 4385 dentry, ceph_lease_op_name(action), session->s_mds); 4386 4387 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); 4388 if (!msg) 4389 return; 4390 lease = msg->front.iov_base; 4391 lease->action = action; 4392 lease->seq = cpu_to_le32(seq); 4393 4394 spin_lock(&dentry->d_lock); 4395 dir = d_inode(dentry->d_parent); 4396 lease->ino = cpu_to_le64(ceph_ino(dir)); 4397 lease->first = lease->last = cpu_to_le64(ceph_snap(dir)); 4398 4399 put_unaligned_le32(dentry->d_name.len, lease + 1); 4400 memcpy((void *)(lease + 1) + 4, 4401 dentry->d_name.name, dentry->d_name.len); 4402 spin_unlock(&dentry->d_lock); 4403 /* 4404 * if this is a preemptive lease RELEASE, no need to 4405 * flush request stream, since the actual request will 4406 * soon follow. 4407 */ 4408 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); 4409 4410 ceph_con_send(&session->s_con, msg); 4411 } 4412 4413 /* 4414 * lock unlock the session, to wait ongoing session activities 4415 */ 4416 static void lock_unlock_session(struct ceph_mds_session *s) 4417 { 4418 mutex_lock(&s->s_mutex); 4419 mutex_unlock(&s->s_mutex); 4420 } 4421 4422 static void maybe_recover_session(struct ceph_mds_client *mdsc) 4423 { 4424 struct ceph_fs_client *fsc = mdsc->fsc; 4425 4426 if (!ceph_test_mount_opt(fsc, CLEANRECOVER)) 4427 return; 4428 4429 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED) 4430 return; 4431 4432 if (!READ_ONCE(fsc->blocklisted)) 4433 return; 4434 4435 pr_info("auto reconnect after blocklisted\n"); 4436 ceph_force_reconnect(fsc->sb); 4437 } 4438 4439 bool check_session_state(struct ceph_mds_session *s) 4440 { 4441 struct ceph_fs_client *fsc = s->s_mdsc->fsc; 4442 4443 switch (s->s_state) { 4444 case CEPH_MDS_SESSION_OPEN: 4445 if (s->s_ttl && time_after(jiffies, s->s_ttl)) { 4446 s->s_state = CEPH_MDS_SESSION_HUNG; 4447 pr_info("mds%d hung\n", s->s_mds); 4448 } 4449 break; 4450 case CEPH_MDS_SESSION_CLOSING: 4451 /* Should never reach this when not force unmounting */ 4452 WARN_ON_ONCE(s->s_ttl && 4453 READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN); 4454 fallthrough; 4455 case CEPH_MDS_SESSION_NEW: 4456 case CEPH_MDS_SESSION_RESTARTING: 4457 case CEPH_MDS_SESSION_CLOSED: 4458 case CEPH_MDS_SESSION_REJECTED: 4459 return false; 4460 } 4461 4462 return true; 4463 } 4464 4465 /* 4466 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply, 4467 * then we need to retransmit that request. 4468 */ 4469 void inc_session_sequence(struct ceph_mds_session *s) 4470 { 4471 lockdep_assert_held(&s->s_mutex); 4472 4473 s->s_seq++; 4474 4475 if (s->s_state == CEPH_MDS_SESSION_CLOSING) { 4476 int ret; 4477 4478 dout("resending session close request for mds%d\n", s->s_mds); 4479 ret = request_close_session(s); 4480 if (ret < 0) 4481 pr_err("unable to close session to mds%d: %d\n", 4482 s->s_mds, ret); 4483 } 4484 } 4485 4486 /* 4487 * delayed work -- periodically trim expired leases, renew caps with mds. If 4488 * the @delay parameter is set to 0 or if it's more than 5 secs, the default 4489 * workqueue delay value of 5 secs will be used. 4490 */ 4491 static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay) 4492 { 4493 unsigned long max_delay = HZ * 5; 4494 4495 /* 5 secs default delay */ 4496 if (!delay || (delay > max_delay)) 4497 delay = max_delay; 4498 schedule_delayed_work(&mdsc->delayed_work, 4499 round_jiffies_relative(delay)); 4500 } 4501 4502 static void delayed_work(struct work_struct *work) 4503 { 4504 struct ceph_mds_client *mdsc = 4505 container_of(work, struct ceph_mds_client, delayed_work.work); 4506 unsigned long delay; 4507 int renew_interval; 4508 int renew_caps; 4509 int i; 4510 4511 dout("mdsc delayed_work\n"); 4512 4513 if (mdsc->stopping) 4514 return; 4515 4516 mutex_lock(&mdsc->mutex); 4517 renew_interval = mdsc->mdsmap->m_session_timeout >> 2; 4518 renew_caps = time_after_eq(jiffies, HZ*renew_interval + 4519 mdsc->last_renew_caps); 4520 if (renew_caps) 4521 mdsc->last_renew_caps = jiffies; 4522 4523 for (i = 0; i < mdsc->max_sessions; i++) { 4524 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); 4525 if (!s) 4526 continue; 4527 4528 if (!check_session_state(s)) { 4529 ceph_put_mds_session(s); 4530 continue; 4531 } 4532 mutex_unlock(&mdsc->mutex); 4533 4534 mutex_lock(&s->s_mutex); 4535 if (renew_caps) 4536 send_renew_caps(mdsc, s); 4537 else 4538 ceph_con_keepalive(&s->s_con); 4539 if (s->s_state == CEPH_MDS_SESSION_OPEN || 4540 s->s_state == CEPH_MDS_SESSION_HUNG) 4541 ceph_send_cap_releases(mdsc, s); 4542 mutex_unlock(&s->s_mutex); 4543 ceph_put_mds_session(s); 4544 4545 mutex_lock(&mdsc->mutex); 4546 } 4547 mutex_unlock(&mdsc->mutex); 4548 4549 delay = ceph_check_delayed_caps(mdsc); 4550 4551 ceph_queue_cap_reclaim_work(mdsc); 4552 4553 ceph_trim_snapid_map(mdsc); 4554 4555 maybe_recover_session(mdsc); 4556 4557 schedule_delayed(mdsc, delay); 4558 } 4559 4560 int ceph_mdsc_init(struct ceph_fs_client *fsc) 4561 4562 { 4563 struct ceph_mds_client *mdsc; 4564 int err; 4565 4566 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); 4567 if (!mdsc) 4568 return -ENOMEM; 4569 mdsc->fsc = fsc; 4570 mutex_init(&mdsc->mutex); 4571 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); 4572 if (!mdsc->mdsmap) { 4573 err = -ENOMEM; 4574 goto err_mdsc; 4575 } 4576 4577 init_completion(&mdsc->safe_umount_waiters); 4578 init_waitqueue_head(&mdsc->session_close_wq); 4579 INIT_LIST_HEAD(&mdsc->waiting_for_map); 4580 mdsc->quotarealms_inodes = RB_ROOT; 4581 mutex_init(&mdsc->quotarealms_inodes_mutex); 4582 init_rwsem(&mdsc->snap_rwsem); 4583 mdsc->snap_realms = RB_ROOT; 4584 INIT_LIST_HEAD(&mdsc->snap_empty); 4585 spin_lock_init(&mdsc->snap_empty_lock); 4586 mdsc->request_tree = RB_ROOT; 4587 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); 4588 mdsc->last_renew_caps = jiffies; 4589 INIT_LIST_HEAD(&mdsc->cap_delay_list); 4590 INIT_LIST_HEAD(&mdsc->cap_wait_list); 4591 spin_lock_init(&mdsc->cap_delay_lock); 4592 INIT_LIST_HEAD(&mdsc->snap_flush_list); 4593 spin_lock_init(&mdsc->snap_flush_lock); 4594 mdsc->last_cap_flush_tid = 1; 4595 INIT_LIST_HEAD(&mdsc->cap_flush_list); 4596 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); 4597 spin_lock_init(&mdsc->cap_dirty_lock); 4598 init_waitqueue_head(&mdsc->cap_flushing_wq); 4599 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work); 4600 err = ceph_metric_init(&mdsc->metric); 4601 if (err) 4602 goto err_mdsmap; 4603 4604 spin_lock_init(&mdsc->dentry_list_lock); 4605 INIT_LIST_HEAD(&mdsc->dentry_leases); 4606 INIT_LIST_HEAD(&mdsc->dentry_dir_leases); 4607 4608 ceph_caps_init(mdsc); 4609 ceph_adjust_caps_max_min(mdsc, fsc->mount_options); 4610 4611 spin_lock_init(&mdsc->snapid_map_lock); 4612 mdsc->snapid_map_tree = RB_ROOT; 4613 INIT_LIST_HEAD(&mdsc->snapid_map_lru); 4614 4615 init_rwsem(&mdsc->pool_perm_rwsem); 4616 mdsc->pool_perm_tree = RB_ROOT; 4617 4618 strscpy(mdsc->nodename, utsname()->nodename, 4619 sizeof(mdsc->nodename)); 4620 4621 fsc->mdsc = mdsc; 4622 return 0; 4623 4624 err_mdsmap: 4625 kfree(mdsc->mdsmap); 4626 err_mdsc: 4627 kfree(mdsc); 4628 return err; 4629 } 4630 4631 /* 4632 * Wait for safe replies on open mds requests. If we time out, drop 4633 * all requests from the tree to avoid dangling dentry refs. 4634 */ 4635 static void wait_requests(struct ceph_mds_client *mdsc) 4636 { 4637 struct ceph_options *opts = mdsc->fsc->client->options; 4638 struct ceph_mds_request *req; 4639 4640 mutex_lock(&mdsc->mutex); 4641 if (__get_oldest_req(mdsc)) { 4642 mutex_unlock(&mdsc->mutex); 4643 4644 dout("wait_requests waiting for requests\n"); 4645 wait_for_completion_timeout(&mdsc->safe_umount_waiters, 4646 ceph_timeout_jiffies(opts->mount_timeout)); 4647 4648 /* tear down remaining requests */ 4649 mutex_lock(&mdsc->mutex); 4650 while ((req = __get_oldest_req(mdsc))) { 4651 dout("wait_requests timed out on tid %llu\n", 4652 req->r_tid); 4653 list_del_init(&req->r_wait); 4654 __unregister_request(mdsc, req); 4655 } 4656 } 4657 mutex_unlock(&mdsc->mutex); 4658 dout("wait_requests done\n"); 4659 } 4660 4661 void send_flush_mdlog(struct ceph_mds_session *s) 4662 { 4663 struct ceph_msg *msg; 4664 4665 /* 4666 * Pre-luminous MDS crashes when it sees an unknown session request 4667 */ 4668 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS)) 4669 return; 4670 4671 mutex_lock(&s->s_mutex); 4672 dout("request mdlog flush to mds%d (%s)s seq %lld\n", s->s_mds, 4673 ceph_session_state_name(s->s_state), s->s_seq); 4674 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG, 4675 s->s_seq); 4676 if (!msg) { 4677 pr_err("failed to request mdlog flush to mds%d (%s) seq %lld\n", 4678 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq); 4679 } else { 4680 ceph_con_send(&s->s_con, msg); 4681 } 4682 mutex_unlock(&s->s_mutex); 4683 } 4684 4685 /* 4686 * called before mount is ro, and before dentries are torn down. 4687 * (hmm, does this still race with new lookups?) 4688 */ 4689 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) 4690 { 4691 dout("pre_umount\n"); 4692 mdsc->stopping = 1; 4693 4694 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true); 4695 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false); 4696 ceph_flush_dirty_caps(mdsc); 4697 wait_requests(mdsc); 4698 4699 /* 4700 * wait for reply handlers to drop their request refs and 4701 * their inode/dcache refs 4702 */ 4703 ceph_msgr_flush(); 4704 4705 ceph_cleanup_quotarealms_inodes(mdsc); 4706 } 4707 4708 /* 4709 * wait for all write mds requests to flush. 4710 */ 4711 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) 4712 { 4713 struct ceph_mds_request *req = NULL, *nextreq; 4714 struct rb_node *n; 4715 4716 mutex_lock(&mdsc->mutex); 4717 dout("wait_unsafe_requests want %lld\n", want_tid); 4718 restart: 4719 req = __get_oldest_req(mdsc); 4720 while (req && req->r_tid <= want_tid) { 4721 /* find next request */ 4722 n = rb_next(&req->r_node); 4723 if (n) 4724 nextreq = rb_entry(n, struct ceph_mds_request, r_node); 4725 else 4726 nextreq = NULL; 4727 if (req->r_op != CEPH_MDS_OP_SETFILELOCK && 4728 (req->r_op & CEPH_MDS_OP_WRITE)) { 4729 /* write op */ 4730 ceph_mdsc_get_request(req); 4731 if (nextreq) 4732 ceph_mdsc_get_request(nextreq); 4733 mutex_unlock(&mdsc->mutex); 4734 dout("wait_unsafe_requests wait on %llu (want %llu)\n", 4735 req->r_tid, want_tid); 4736 wait_for_completion(&req->r_safe_completion); 4737 mutex_lock(&mdsc->mutex); 4738 ceph_mdsc_put_request(req); 4739 if (!nextreq) 4740 break; /* next dne before, so we're done! */ 4741 if (RB_EMPTY_NODE(&nextreq->r_node)) { 4742 /* next request was removed from tree */ 4743 ceph_mdsc_put_request(nextreq); 4744 goto restart; 4745 } 4746 ceph_mdsc_put_request(nextreq); /* won't go away */ 4747 } 4748 req = nextreq; 4749 } 4750 mutex_unlock(&mdsc->mutex); 4751 dout("wait_unsafe_requests done\n"); 4752 } 4753 4754 void ceph_mdsc_sync(struct ceph_mds_client *mdsc) 4755 { 4756 u64 want_tid, want_flush; 4757 4758 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) 4759 return; 4760 4761 dout("sync\n"); 4762 mutex_lock(&mdsc->mutex); 4763 want_tid = mdsc->last_tid; 4764 mutex_unlock(&mdsc->mutex); 4765 4766 ceph_flush_dirty_caps(mdsc); 4767 spin_lock(&mdsc->cap_dirty_lock); 4768 want_flush = mdsc->last_cap_flush_tid; 4769 if (!list_empty(&mdsc->cap_flush_list)) { 4770 struct ceph_cap_flush *cf = 4771 list_last_entry(&mdsc->cap_flush_list, 4772 struct ceph_cap_flush, g_list); 4773 cf->wake = true; 4774 } 4775 spin_unlock(&mdsc->cap_dirty_lock); 4776 4777 dout("sync want tid %lld flush_seq %lld\n", 4778 want_tid, want_flush); 4779 4780 wait_unsafe_requests(mdsc, want_tid); 4781 wait_caps_flush(mdsc, want_flush); 4782 } 4783 4784 /* 4785 * true if all sessions are closed, or we force unmount 4786 */ 4787 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped) 4788 { 4789 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) 4790 return true; 4791 return atomic_read(&mdsc->num_sessions) <= skipped; 4792 } 4793 4794 /* 4795 * called after sb is ro. 4796 */ 4797 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) 4798 { 4799 struct ceph_options *opts = mdsc->fsc->client->options; 4800 struct ceph_mds_session *session; 4801 int i; 4802 int skipped = 0; 4803 4804 dout("close_sessions\n"); 4805 4806 /* close sessions */ 4807 mutex_lock(&mdsc->mutex); 4808 for (i = 0; i < mdsc->max_sessions; i++) { 4809 session = __ceph_lookup_mds_session(mdsc, i); 4810 if (!session) 4811 continue; 4812 mutex_unlock(&mdsc->mutex); 4813 mutex_lock(&session->s_mutex); 4814 if (__close_session(mdsc, session) <= 0) 4815 skipped++; 4816 mutex_unlock(&session->s_mutex); 4817 ceph_put_mds_session(session); 4818 mutex_lock(&mdsc->mutex); 4819 } 4820 mutex_unlock(&mdsc->mutex); 4821 4822 dout("waiting for sessions to close\n"); 4823 wait_event_timeout(mdsc->session_close_wq, 4824 done_closing_sessions(mdsc, skipped), 4825 ceph_timeout_jiffies(opts->mount_timeout)); 4826 4827 /* tear down remaining sessions */ 4828 mutex_lock(&mdsc->mutex); 4829 for (i = 0; i < mdsc->max_sessions; i++) { 4830 if (mdsc->sessions[i]) { 4831 session = ceph_get_mds_session(mdsc->sessions[i]); 4832 __unregister_session(mdsc, session); 4833 mutex_unlock(&mdsc->mutex); 4834 mutex_lock(&session->s_mutex); 4835 remove_session_caps(session); 4836 mutex_unlock(&session->s_mutex); 4837 ceph_put_mds_session(session); 4838 mutex_lock(&mdsc->mutex); 4839 } 4840 } 4841 WARN_ON(!list_empty(&mdsc->cap_delay_list)); 4842 mutex_unlock(&mdsc->mutex); 4843 4844 ceph_cleanup_snapid_map(mdsc); 4845 ceph_cleanup_empty_realms(mdsc); 4846 4847 cancel_work_sync(&mdsc->cap_reclaim_work); 4848 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ 4849 4850 dout("stopped\n"); 4851 } 4852 4853 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) 4854 { 4855 struct ceph_mds_session *session; 4856 int mds; 4857 4858 dout("force umount\n"); 4859 4860 mutex_lock(&mdsc->mutex); 4861 for (mds = 0; mds < mdsc->max_sessions; mds++) { 4862 session = __ceph_lookup_mds_session(mdsc, mds); 4863 if (!session) 4864 continue; 4865 4866 if (session->s_state == CEPH_MDS_SESSION_REJECTED) 4867 __unregister_session(mdsc, session); 4868 __wake_requests(mdsc, &session->s_waiting); 4869 mutex_unlock(&mdsc->mutex); 4870 4871 mutex_lock(&session->s_mutex); 4872 __close_session(mdsc, session); 4873 if (session->s_state == CEPH_MDS_SESSION_CLOSING) { 4874 cleanup_session_requests(mdsc, session); 4875 remove_session_caps(session); 4876 } 4877 mutex_unlock(&session->s_mutex); 4878 ceph_put_mds_session(session); 4879 4880 mutex_lock(&mdsc->mutex); 4881 kick_requests(mdsc, mds); 4882 } 4883 __wake_requests(mdsc, &mdsc->waiting_for_map); 4884 mutex_unlock(&mdsc->mutex); 4885 } 4886 4887 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) 4888 { 4889 dout("stop\n"); 4890 /* 4891 * Make sure the delayed work stopped before releasing 4892 * the resources. 4893 * 4894 * Because the cancel_delayed_work_sync() will only 4895 * guarantee that the work finishes executing. But the 4896 * delayed work will re-arm itself again after that. 4897 */ 4898 flush_delayed_work(&mdsc->delayed_work); 4899 4900 if (mdsc->mdsmap) 4901 ceph_mdsmap_destroy(mdsc->mdsmap); 4902 kfree(mdsc->sessions); 4903 ceph_caps_finalize(mdsc); 4904 ceph_pool_perm_destroy(mdsc); 4905 } 4906 4907 void ceph_mdsc_destroy(struct ceph_fs_client *fsc) 4908 { 4909 struct ceph_mds_client *mdsc = fsc->mdsc; 4910 dout("mdsc_destroy %p\n", mdsc); 4911 4912 if (!mdsc) 4913 return; 4914 4915 /* flush out any connection work with references to us */ 4916 ceph_msgr_flush(); 4917 4918 ceph_mdsc_stop(mdsc); 4919 4920 ceph_metric_destroy(&mdsc->metric); 4921 4922 fsc->mdsc = NULL; 4923 kfree(mdsc); 4924 dout("mdsc_destroy %p done\n", mdsc); 4925 } 4926 4927 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) 4928 { 4929 struct ceph_fs_client *fsc = mdsc->fsc; 4930 const char *mds_namespace = fsc->mount_options->mds_namespace; 4931 void *p = msg->front.iov_base; 4932 void *end = p + msg->front.iov_len; 4933 u32 epoch; 4934 u32 num_fs; 4935 u32 mount_fscid = (u32)-1; 4936 int err = -EINVAL; 4937 4938 ceph_decode_need(&p, end, sizeof(u32), bad); 4939 epoch = ceph_decode_32(&p); 4940 4941 dout("handle_fsmap epoch %u\n", epoch); 4942 4943 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */ 4944 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad); 4945 4946 ceph_decode_32_safe(&p, end, num_fs, bad); 4947 while (num_fs-- > 0) { 4948 void *info_p, *info_end; 4949 u32 info_len; 4950 u32 fscid, namelen; 4951 4952 ceph_decode_need(&p, end, 2 + sizeof(u32), bad); 4953 p += 2; // info_v, info_cv 4954 info_len = ceph_decode_32(&p); 4955 ceph_decode_need(&p, end, info_len, bad); 4956 info_p = p; 4957 info_end = p + info_len; 4958 p = info_end; 4959 4960 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad); 4961 fscid = ceph_decode_32(&info_p); 4962 namelen = ceph_decode_32(&info_p); 4963 ceph_decode_need(&info_p, info_end, namelen, bad); 4964 4965 if (mds_namespace && 4966 strlen(mds_namespace) == namelen && 4967 !strncmp(mds_namespace, (char *)info_p, namelen)) { 4968 mount_fscid = fscid; 4969 break; 4970 } 4971 } 4972 4973 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch); 4974 if (mount_fscid != (u32)-1) { 4975 fsc->client->monc.fs_cluster_id = mount_fscid; 4976 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 4977 0, true); 4978 ceph_monc_renew_subs(&fsc->client->monc); 4979 } else { 4980 err = -ENOENT; 4981 goto err_out; 4982 } 4983 return; 4984 4985 bad: 4986 pr_err("error decoding fsmap %d. Shutting down mount.\n", err); 4987 ceph_umount_begin(mdsc->fsc->sb); 4988 err_out: 4989 mutex_lock(&mdsc->mutex); 4990 mdsc->mdsmap_err = err; 4991 __wake_requests(mdsc, &mdsc->waiting_for_map); 4992 mutex_unlock(&mdsc->mutex); 4993 } 4994 4995 /* 4996 * handle mds map update. 4997 */ 4998 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) 4999 { 5000 u32 epoch; 5001 u32 maplen; 5002 void *p = msg->front.iov_base; 5003 void *end = p + msg->front.iov_len; 5004 struct ceph_mdsmap *newmap, *oldmap; 5005 struct ceph_fsid fsid; 5006 int err = -EINVAL; 5007 5008 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); 5009 ceph_decode_copy(&p, &fsid, sizeof(fsid)); 5010 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) 5011 return; 5012 epoch = ceph_decode_32(&p); 5013 maplen = ceph_decode_32(&p); 5014 dout("handle_map epoch %u len %d\n", epoch, (int)maplen); 5015 5016 /* do we need it? */ 5017 mutex_lock(&mdsc->mutex); 5018 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { 5019 dout("handle_map epoch %u <= our %u\n", 5020 epoch, mdsc->mdsmap->m_epoch); 5021 mutex_unlock(&mdsc->mutex); 5022 return; 5023 } 5024 5025 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client)); 5026 if (IS_ERR(newmap)) { 5027 err = PTR_ERR(newmap); 5028 goto bad_unlock; 5029 } 5030 5031 /* swap into place */ 5032 if (mdsc->mdsmap) { 5033 oldmap = mdsc->mdsmap; 5034 mdsc->mdsmap = newmap; 5035 check_new_map(mdsc, newmap, oldmap); 5036 ceph_mdsmap_destroy(oldmap); 5037 } else { 5038 mdsc->mdsmap = newmap; /* first mds map */ 5039 } 5040 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size, 5041 MAX_LFS_FILESIZE); 5042 5043 __wake_requests(mdsc, &mdsc->waiting_for_map); 5044 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, 5045 mdsc->mdsmap->m_epoch); 5046 5047 mutex_unlock(&mdsc->mutex); 5048 schedule_delayed(mdsc, 0); 5049 return; 5050 5051 bad_unlock: 5052 mutex_unlock(&mdsc->mutex); 5053 bad: 5054 pr_err("error decoding mdsmap %d. Shutting down mount.\n", err); 5055 ceph_umount_begin(mdsc->fsc->sb); 5056 return; 5057 } 5058 5059 static struct ceph_connection *mds_get_con(struct ceph_connection *con) 5060 { 5061 struct ceph_mds_session *s = con->private; 5062 5063 if (ceph_get_mds_session(s)) 5064 return con; 5065 return NULL; 5066 } 5067 5068 static void mds_put_con(struct ceph_connection *con) 5069 { 5070 struct ceph_mds_session *s = con->private; 5071 5072 ceph_put_mds_session(s); 5073 } 5074 5075 /* 5076 * if the client is unresponsive for long enough, the mds will kill 5077 * the session entirely. 5078 */ 5079 static void mds_peer_reset(struct ceph_connection *con) 5080 { 5081 struct ceph_mds_session *s = con->private; 5082 struct ceph_mds_client *mdsc = s->s_mdsc; 5083 5084 pr_warn("mds%d closed our session\n", s->s_mds); 5085 send_mds_reconnect(mdsc, s); 5086 } 5087 5088 static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg) 5089 { 5090 struct ceph_mds_session *s = con->private; 5091 struct ceph_mds_client *mdsc = s->s_mdsc; 5092 int type = le16_to_cpu(msg->hdr.type); 5093 5094 mutex_lock(&mdsc->mutex); 5095 if (__verify_registered_session(mdsc, s) < 0) { 5096 mutex_unlock(&mdsc->mutex); 5097 goto out; 5098 } 5099 mutex_unlock(&mdsc->mutex); 5100 5101 switch (type) { 5102 case CEPH_MSG_MDS_MAP: 5103 ceph_mdsc_handle_mdsmap(mdsc, msg); 5104 break; 5105 case CEPH_MSG_FS_MAP_USER: 5106 ceph_mdsc_handle_fsmap(mdsc, msg); 5107 break; 5108 case CEPH_MSG_CLIENT_SESSION: 5109 handle_session(s, msg); 5110 break; 5111 case CEPH_MSG_CLIENT_REPLY: 5112 handle_reply(s, msg); 5113 break; 5114 case CEPH_MSG_CLIENT_REQUEST_FORWARD: 5115 handle_forward(mdsc, s, msg); 5116 break; 5117 case CEPH_MSG_CLIENT_CAPS: 5118 ceph_handle_caps(s, msg); 5119 break; 5120 case CEPH_MSG_CLIENT_SNAP: 5121 ceph_handle_snap(mdsc, s, msg); 5122 break; 5123 case CEPH_MSG_CLIENT_LEASE: 5124 handle_lease(mdsc, s, msg); 5125 break; 5126 case CEPH_MSG_CLIENT_QUOTA: 5127 ceph_handle_quota(mdsc, s, msg); 5128 break; 5129 5130 default: 5131 pr_err("received unknown message type %d %s\n", type, 5132 ceph_msg_type_name(type)); 5133 } 5134 out: 5135 ceph_msg_put(msg); 5136 } 5137 5138 /* 5139 * authentication 5140 */ 5141 5142 /* 5143 * Note: returned pointer is the address of a structure that's 5144 * managed separately. Caller must *not* attempt to free it. 5145 */ 5146 static struct ceph_auth_handshake * 5147 mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new) 5148 { 5149 struct ceph_mds_session *s = con->private; 5150 struct ceph_mds_client *mdsc = s->s_mdsc; 5151 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 5152 struct ceph_auth_handshake *auth = &s->s_auth; 5153 int ret; 5154 5155 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, 5156 force_new, proto, NULL, NULL); 5157 if (ret) 5158 return ERR_PTR(ret); 5159 5160 return auth; 5161 } 5162 5163 static int mds_add_authorizer_challenge(struct ceph_connection *con, 5164 void *challenge_buf, int challenge_buf_len) 5165 { 5166 struct ceph_mds_session *s = con->private; 5167 struct ceph_mds_client *mdsc = s->s_mdsc; 5168 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 5169 5170 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer, 5171 challenge_buf, challenge_buf_len); 5172 } 5173 5174 static int mds_verify_authorizer_reply(struct ceph_connection *con) 5175 { 5176 struct ceph_mds_session *s = con->private; 5177 struct ceph_mds_client *mdsc = s->s_mdsc; 5178 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 5179 struct ceph_auth_handshake *auth = &s->s_auth; 5180 5181 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer, 5182 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len, 5183 NULL, NULL, NULL, NULL); 5184 } 5185 5186 static int mds_invalidate_authorizer(struct ceph_connection *con) 5187 { 5188 struct ceph_mds_session *s = con->private; 5189 struct ceph_mds_client *mdsc = s->s_mdsc; 5190 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 5191 5192 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); 5193 5194 return ceph_monc_validate_auth(&mdsc->fsc->client->monc); 5195 } 5196 5197 static int mds_get_auth_request(struct ceph_connection *con, 5198 void *buf, int *buf_len, 5199 void **authorizer, int *authorizer_len) 5200 { 5201 struct ceph_mds_session *s = con->private; 5202 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 5203 struct ceph_auth_handshake *auth = &s->s_auth; 5204 int ret; 5205 5206 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, 5207 buf, buf_len); 5208 if (ret) 5209 return ret; 5210 5211 *authorizer = auth->authorizer_buf; 5212 *authorizer_len = auth->authorizer_buf_len; 5213 return 0; 5214 } 5215 5216 static int mds_handle_auth_reply_more(struct ceph_connection *con, 5217 void *reply, int reply_len, 5218 void *buf, int *buf_len, 5219 void **authorizer, int *authorizer_len) 5220 { 5221 struct ceph_mds_session *s = con->private; 5222 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 5223 struct ceph_auth_handshake *auth = &s->s_auth; 5224 int ret; 5225 5226 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len, 5227 buf, buf_len); 5228 if (ret) 5229 return ret; 5230 5231 *authorizer = auth->authorizer_buf; 5232 *authorizer_len = auth->authorizer_buf_len; 5233 return 0; 5234 } 5235 5236 static int mds_handle_auth_done(struct ceph_connection *con, 5237 u64 global_id, void *reply, int reply_len, 5238 u8 *session_key, int *session_key_len, 5239 u8 *con_secret, int *con_secret_len) 5240 { 5241 struct ceph_mds_session *s = con->private; 5242 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 5243 struct ceph_auth_handshake *auth = &s->s_auth; 5244 5245 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len, 5246 session_key, session_key_len, 5247 con_secret, con_secret_len); 5248 } 5249 5250 static int mds_handle_auth_bad_method(struct ceph_connection *con, 5251 int used_proto, int result, 5252 const int *allowed_protos, int proto_cnt, 5253 const int *allowed_modes, int mode_cnt) 5254 { 5255 struct ceph_mds_session *s = con->private; 5256 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc; 5257 int ret; 5258 5259 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS, 5260 used_proto, result, 5261 allowed_protos, proto_cnt, 5262 allowed_modes, mode_cnt)) { 5263 ret = ceph_monc_validate_auth(monc); 5264 if (ret) 5265 return ret; 5266 } 5267 5268 return -EACCES; 5269 } 5270 5271 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, 5272 struct ceph_msg_header *hdr, int *skip) 5273 { 5274 struct ceph_msg *msg; 5275 int type = (int) le16_to_cpu(hdr->type); 5276 int front_len = (int) le32_to_cpu(hdr->front_len); 5277 5278 if (con->in_msg) 5279 return con->in_msg; 5280 5281 *skip = 0; 5282 msg = ceph_msg_new(type, front_len, GFP_NOFS, false); 5283 if (!msg) { 5284 pr_err("unable to allocate msg type %d len %d\n", 5285 type, front_len); 5286 return NULL; 5287 } 5288 5289 return msg; 5290 } 5291 5292 static int mds_sign_message(struct ceph_msg *msg) 5293 { 5294 struct ceph_mds_session *s = msg->con->private; 5295 struct ceph_auth_handshake *auth = &s->s_auth; 5296 5297 return ceph_auth_sign_message(auth, msg); 5298 } 5299 5300 static int mds_check_message_signature(struct ceph_msg *msg) 5301 { 5302 struct ceph_mds_session *s = msg->con->private; 5303 struct ceph_auth_handshake *auth = &s->s_auth; 5304 5305 return ceph_auth_check_message_signature(auth, msg); 5306 } 5307 5308 static const struct ceph_connection_operations mds_con_ops = { 5309 .get = mds_get_con, 5310 .put = mds_put_con, 5311 .alloc_msg = mds_alloc_msg, 5312 .dispatch = mds_dispatch, 5313 .peer_reset = mds_peer_reset, 5314 .get_authorizer = mds_get_authorizer, 5315 .add_authorizer_challenge = mds_add_authorizer_challenge, 5316 .verify_authorizer_reply = mds_verify_authorizer_reply, 5317 .invalidate_authorizer = mds_invalidate_authorizer, 5318 .sign_message = mds_sign_message, 5319 .check_message_signature = mds_check_message_signature, 5320 .get_auth_request = mds_get_auth_request, 5321 .handle_auth_reply_more = mds_handle_auth_reply_more, 5322 .handle_auth_done = mds_handle_auth_done, 5323 .handle_auth_bad_method = mds_handle_auth_bad_method, 5324 }; 5325 5326 /* eof */ 5327