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 #include <linux/mnt_idmapping.h> 16 17 #include "super.h" 18 #include "mds_client.h" 19 #include "crypto.h" 20 21 #include <linux/ceph/ceph_features.h> 22 #include <linux/ceph/messenger.h> 23 #include <linux/ceph/decode.h> 24 #include <linux/ceph/pagelist.h> 25 #include <linux/ceph/auth.h> 26 #include <linux/ceph/debugfs.h> 27 28 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE) 29 30 /* 31 * A cluster of MDS (metadata server) daemons is responsible for 32 * managing the file system namespace (the directory hierarchy and 33 * inodes) and for coordinating shared access to storage. Metadata is 34 * partitioning hierarchically across a number of servers, and that 35 * partition varies over time as the cluster adjusts the distribution 36 * in order to balance load. 37 * 38 * The MDS client is primarily responsible to managing synchronous 39 * metadata requests for operations like open, unlink, and so forth. 40 * If there is a MDS failure, we find out about it when we (possibly 41 * request and) receive a new MDS map, and can resubmit affected 42 * requests. 43 * 44 * For the most part, though, we take advantage of a lossless 45 * communications channel to the MDS, and do not need to worry about 46 * timing out or resubmitting requests. 47 * 48 * We maintain a stateful "session" with each MDS we interact with. 49 * Within each session, we sent periodic heartbeat messages to ensure 50 * any capabilities or leases we have been issues remain valid. If 51 * the session times out and goes stale, our leases and capabilities 52 * are no longer valid. 53 */ 54 55 struct ceph_reconnect_state { 56 struct ceph_mds_session *session; 57 int nr_caps, nr_realms; 58 struct ceph_pagelist *pagelist; 59 unsigned msg_version; 60 bool allow_multi; 61 }; 62 63 static void __wake_requests(struct ceph_mds_client *mdsc, 64 struct list_head *head); 65 static void ceph_cap_release_work(struct work_struct *work); 66 static void ceph_cap_reclaim_work(struct work_struct *work); 67 68 static const struct ceph_connection_operations mds_con_ops; 69 70 71 /* 72 * mds reply parsing 73 */ 74 75 static int parse_reply_info_quota(void **p, void *end, 76 struct ceph_mds_reply_info_in *info) 77 { 78 u8 struct_v, struct_compat; 79 u32 struct_len; 80 81 ceph_decode_8_safe(p, end, struct_v, bad); 82 ceph_decode_8_safe(p, end, struct_compat, bad); 83 /* struct_v is expected to be >= 1. we only 84 * understand encoding with struct_compat == 1. */ 85 if (!struct_v || struct_compat != 1) 86 goto bad; 87 ceph_decode_32_safe(p, end, struct_len, bad); 88 ceph_decode_need(p, end, struct_len, bad); 89 end = *p + struct_len; 90 ceph_decode_64_safe(p, end, info->max_bytes, bad); 91 ceph_decode_64_safe(p, end, info->max_files, bad); 92 *p = end; 93 return 0; 94 bad: 95 return -EIO; 96 } 97 98 /* 99 * parse individual inode info 100 */ 101 static int parse_reply_info_in(void **p, void *end, 102 struct ceph_mds_reply_info_in *info, 103 u64 features) 104 { 105 int err = 0; 106 u8 struct_v = 0; 107 108 if (features == (u64)-1) { 109 u32 struct_len; 110 u8 struct_compat; 111 ceph_decode_8_safe(p, end, struct_v, bad); 112 ceph_decode_8_safe(p, end, struct_compat, bad); 113 /* struct_v is expected to be >= 1. we only understand 114 * encoding with struct_compat == 1. */ 115 if (!struct_v || struct_compat != 1) 116 goto bad; 117 ceph_decode_32_safe(p, end, struct_len, bad); 118 ceph_decode_need(p, end, struct_len, bad); 119 end = *p + struct_len; 120 } 121 122 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad); 123 info->in = *p; 124 *p += sizeof(struct ceph_mds_reply_inode) + 125 sizeof(*info->in->fragtree.splits) * 126 le32_to_cpu(info->in->fragtree.nsplits); 127 128 ceph_decode_32_safe(p, end, info->symlink_len, bad); 129 ceph_decode_need(p, end, info->symlink_len, bad); 130 info->symlink = *p; 131 *p += info->symlink_len; 132 133 ceph_decode_copy_safe(p, end, &info->dir_layout, 134 sizeof(info->dir_layout), bad); 135 ceph_decode_32_safe(p, end, info->xattr_len, bad); 136 ceph_decode_need(p, end, info->xattr_len, bad); 137 info->xattr_data = *p; 138 *p += info->xattr_len; 139 140 if (features == (u64)-1) { 141 /* inline data */ 142 ceph_decode_64_safe(p, end, info->inline_version, bad); 143 ceph_decode_32_safe(p, end, info->inline_len, bad); 144 ceph_decode_need(p, end, info->inline_len, bad); 145 info->inline_data = *p; 146 *p += info->inline_len; 147 /* quota */ 148 err = parse_reply_info_quota(p, end, info); 149 if (err < 0) 150 goto out_bad; 151 /* pool namespace */ 152 ceph_decode_32_safe(p, end, info->pool_ns_len, bad); 153 if (info->pool_ns_len > 0) { 154 ceph_decode_need(p, end, info->pool_ns_len, bad); 155 info->pool_ns_data = *p; 156 *p += info->pool_ns_len; 157 } 158 159 /* btime */ 160 ceph_decode_need(p, end, sizeof(info->btime), bad); 161 ceph_decode_copy(p, &info->btime, sizeof(info->btime)); 162 163 /* change attribute */ 164 ceph_decode_64_safe(p, end, info->change_attr, bad); 165 166 /* dir pin */ 167 if (struct_v >= 2) { 168 ceph_decode_32_safe(p, end, info->dir_pin, bad); 169 } else { 170 info->dir_pin = -ENODATA; 171 } 172 173 /* snapshot birth time, remains zero for v<=2 */ 174 if (struct_v >= 3) { 175 ceph_decode_need(p, end, sizeof(info->snap_btime), bad); 176 ceph_decode_copy(p, &info->snap_btime, 177 sizeof(info->snap_btime)); 178 } else { 179 memset(&info->snap_btime, 0, sizeof(info->snap_btime)); 180 } 181 182 /* snapshot count, remains zero for v<=3 */ 183 if (struct_v >= 4) { 184 ceph_decode_64_safe(p, end, info->rsnaps, bad); 185 } else { 186 info->rsnaps = 0; 187 } 188 189 if (struct_v >= 5) { 190 u32 alen; 191 192 ceph_decode_32_safe(p, end, alen, bad); 193 194 while (alen--) { 195 u32 len; 196 197 /* key */ 198 ceph_decode_32_safe(p, end, len, bad); 199 ceph_decode_skip_n(p, end, len, bad); 200 /* value */ 201 ceph_decode_32_safe(p, end, len, bad); 202 ceph_decode_skip_n(p, end, len, bad); 203 } 204 } 205 206 /* fscrypt flag -- ignore */ 207 if (struct_v >= 6) 208 ceph_decode_skip_8(p, end, bad); 209 210 info->fscrypt_auth = NULL; 211 info->fscrypt_auth_len = 0; 212 info->fscrypt_file = NULL; 213 info->fscrypt_file_len = 0; 214 if (struct_v >= 7) { 215 ceph_decode_32_safe(p, end, info->fscrypt_auth_len, bad); 216 if (info->fscrypt_auth_len) { 217 info->fscrypt_auth = kmalloc(info->fscrypt_auth_len, 218 GFP_KERNEL); 219 if (!info->fscrypt_auth) 220 return -ENOMEM; 221 ceph_decode_copy_safe(p, end, info->fscrypt_auth, 222 info->fscrypt_auth_len, bad); 223 } 224 ceph_decode_32_safe(p, end, info->fscrypt_file_len, bad); 225 if (info->fscrypt_file_len) { 226 info->fscrypt_file = kmalloc(info->fscrypt_file_len, 227 GFP_KERNEL); 228 if (!info->fscrypt_file) 229 return -ENOMEM; 230 ceph_decode_copy_safe(p, end, info->fscrypt_file, 231 info->fscrypt_file_len, bad); 232 } 233 } 234 *p = end; 235 } else { 236 /* legacy (unversioned) struct */ 237 if (features & CEPH_FEATURE_MDS_INLINE_DATA) { 238 ceph_decode_64_safe(p, end, info->inline_version, bad); 239 ceph_decode_32_safe(p, end, info->inline_len, bad); 240 ceph_decode_need(p, end, info->inline_len, bad); 241 info->inline_data = *p; 242 *p += info->inline_len; 243 } else 244 info->inline_version = CEPH_INLINE_NONE; 245 246 if (features & CEPH_FEATURE_MDS_QUOTA) { 247 err = parse_reply_info_quota(p, end, info); 248 if (err < 0) 249 goto out_bad; 250 } else { 251 info->max_bytes = 0; 252 info->max_files = 0; 253 } 254 255 info->pool_ns_len = 0; 256 info->pool_ns_data = NULL; 257 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { 258 ceph_decode_32_safe(p, end, info->pool_ns_len, bad); 259 if (info->pool_ns_len > 0) { 260 ceph_decode_need(p, end, info->pool_ns_len, bad); 261 info->pool_ns_data = *p; 262 *p += info->pool_ns_len; 263 } 264 } 265 266 if (features & CEPH_FEATURE_FS_BTIME) { 267 ceph_decode_need(p, end, sizeof(info->btime), bad); 268 ceph_decode_copy(p, &info->btime, sizeof(info->btime)); 269 ceph_decode_64_safe(p, end, info->change_attr, bad); 270 } 271 272 info->dir_pin = -ENODATA; 273 /* info->snap_btime and info->rsnaps remain zero */ 274 } 275 return 0; 276 bad: 277 err = -EIO; 278 out_bad: 279 return err; 280 } 281 282 static int parse_reply_info_dir(void **p, void *end, 283 struct ceph_mds_reply_dirfrag **dirfrag, 284 u64 features) 285 { 286 if (features == (u64)-1) { 287 u8 struct_v, struct_compat; 288 u32 struct_len; 289 ceph_decode_8_safe(p, end, struct_v, bad); 290 ceph_decode_8_safe(p, end, struct_compat, bad); 291 /* struct_v is expected to be >= 1. we only understand 292 * encoding whose struct_compat == 1. */ 293 if (!struct_v || struct_compat != 1) 294 goto bad; 295 ceph_decode_32_safe(p, end, struct_len, bad); 296 ceph_decode_need(p, end, struct_len, bad); 297 end = *p + struct_len; 298 } 299 300 ceph_decode_need(p, end, sizeof(**dirfrag), bad); 301 *dirfrag = *p; 302 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist); 303 if (unlikely(*p > end)) 304 goto bad; 305 if (features == (u64)-1) 306 *p = end; 307 return 0; 308 bad: 309 return -EIO; 310 } 311 312 static int parse_reply_info_lease(void **p, void *end, 313 struct ceph_mds_reply_lease **lease, 314 u64 features, u32 *altname_len, u8 **altname) 315 { 316 u8 struct_v; 317 u32 struct_len; 318 void *lend; 319 320 if (features == (u64)-1) { 321 u8 struct_compat; 322 323 ceph_decode_8_safe(p, end, struct_v, bad); 324 ceph_decode_8_safe(p, end, struct_compat, bad); 325 326 /* struct_v is expected to be >= 1. we only understand 327 * encoding whose struct_compat == 1. */ 328 if (!struct_v || struct_compat != 1) 329 goto bad; 330 331 ceph_decode_32_safe(p, end, struct_len, bad); 332 } else { 333 struct_len = sizeof(**lease); 334 *altname_len = 0; 335 *altname = NULL; 336 } 337 338 lend = *p + struct_len; 339 ceph_decode_need(p, end, struct_len, bad); 340 *lease = *p; 341 *p += sizeof(**lease); 342 343 if (features == (u64)-1) { 344 if (struct_v >= 2) { 345 ceph_decode_32_safe(p, end, *altname_len, bad); 346 ceph_decode_need(p, end, *altname_len, bad); 347 *altname = *p; 348 *p += *altname_len; 349 } else { 350 *altname = NULL; 351 *altname_len = 0; 352 } 353 } 354 *p = lend; 355 return 0; 356 bad: 357 return -EIO; 358 } 359 360 /* 361 * parse a normal reply, which may contain a (dir+)dentry and/or a 362 * target inode. 363 */ 364 static int parse_reply_info_trace(void **p, void *end, 365 struct ceph_mds_reply_info_parsed *info, 366 u64 features) 367 { 368 int err; 369 370 if (info->head->is_dentry) { 371 err = parse_reply_info_in(p, end, &info->diri, features); 372 if (err < 0) 373 goto out_bad; 374 375 err = parse_reply_info_dir(p, end, &info->dirfrag, features); 376 if (err < 0) 377 goto out_bad; 378 379 ceph_decode_32_safe(p, end, info->dname_len, bad); 380 ceph_decode_need(p, end, info->dname_len, bad); 381 info->dname = *p; 382 *p += info->dname_len; 383 384 err = parse_reply_info_lease(p, end, &info->dlease, features, 385 &info->altname_len, &info->altname); 386 if (err < 0) 387 goto out_bad; 388 } 389 390 if (info->head->is_target) { 391 err = parse_reply_info_in(p, end, &info->targeti, features); 392 if (err < 0) 393 goto out_bad; 394 } 395 396 if (unlikely(*p != end)) 397 goto bad; 398 return 0; 399 400 bad: 401 err = -EIO; 402 out_bad: 403 pr_err("problem parsing mds trace %d\n", err); 404 return err; 405 } 406 407 /* 408 * parse readdir results 409 */ 410 static int parse_reply_info_readdir(void **p, void *end, 411 struct ceph_mds_request *req, 412 u64 features) 413 { 414 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info; 415 struct ceph_client *cl = req->r_mdsc->fsc->client; 416 u32 num, i = 0; 417 int err; 418 419 err = parse_reply_info_dir(p, end, &info->dir_dir, features); 420 if (err < 0) 421 goto out_bad; 422 423 ceph_decode_need(p, end, sizeof(num) + 2, bad); 424 num = ceph_decode_32(p); 425 { 426 u16 flags = ceph_decode_16(p); 427 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END); 428 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE); 429 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER); 430 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH); 431 } 432 if (num == 0) 433 goto done; 434 435 BUG_ON(!info->dir_entries); 436 if ((unsigned long)(info->dir_entries + num) > 437 (unsigned long)info->dir_entries + info->dir_buf_size) { 438 pr_err_client(cl, "dir contents are larger than expected\n"); 439 WARN_ON(1); 440 goto bad; 441 } 442 443 info->dir_nr = num; 444 while (num) { 445 struct inode *inode = d_inode(req->r_dentry); 446 struct ceph_inode_info *ci = ceph_inode(inode); 447 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; 448 struct fscrypt_str tname = FSTR_INIT(NULL, 0); 449 struct fscrypt_str oname = FSTR_INIT(NULL, 0); 450 struct ceph_fname fname; 451 u32 altname_len, _name_len; 452 u8 *altname, *_name; 453 454 /* dentry */ 455 ceph_decode_32_safe(p, end, _name_len, bad); 456 ceph_decode_need(p, end, _name_len, bad); 457 _name = *p; 458 *p += _name_len; 459 doutc(cl, "parsed dir dname '%.*s'\n", _name_len, _name); 460 461 if (info->hash_order) 462 rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, 463 _name, _name_len); 464 465 /* dentry lease */ 466 err = parse_reply_info_lease(p, end, &rde->lease, features, 467 &altname_len, &altname); 468 if (err) 469 goto out_bad; 470 471 /* 472 * Try to dencrypt the dentry names and update them 473 * in the ceph_mds_reply_dir_entry struct. 474 */ 475 fname.dir = inode; 476 fname.name = _name; 477 fname.name_len = _name_len; 478 fname.ctext = altname; 479 fname.ctext_len = altname_len; 480 /* 481 * The _name_len maybe larger than altname_len, such as 482 * when the human readable name length is in range of 483 * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE), 484 * then the copy in ceph_fname_to_usr will corrupt the 485 * data if there has no encryption key. 486 * 487 * Just set the no_copy flag and then if there has no 488 * encryption key the oname.name will be assigned to 489 * _name always. 490 */ 491 fname.no_copy = true; 492 if (altname_len == 0) { 493 /* 494 * Set tname to _name, and this will be used 495 * to do the base64_decode in-place. It's 496 * safe because the decoded string should 497 * always be shorter, which is 3/4 of origin 498 * string. 499 */ 500 tname.name = _name; 501 502 /* 503 * Set oname to _name too, and this will be 504 * used to do the dencryption in-place. 505 */ 506 oname.name = _name; 507 oname.len = _name_len; 508 } else { 509 /* 510 * This will do the decryption only in-place 511 * from altname cryptext directly. 512 */ 513 oname.name = altname; 514 oname.len = altname_len; 515 } 516 rde->is_nokey = false; 517 err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey); 518 if (err) { 519 pr_err_client(cl, "unable to decode %.*s, got %d\n", 520 _name_len, _name, err); 521 goto out_bad; 522 } 523 rde->name = oname.name; 524 rde->name_len = oname.len; 525 526 /* inode */ 527 err = parse_reply_info_in(p, end, &rde->inode, features); 528 if (err < 0) 529 goto out_bad; 530 /* ceph_readdir_prepopulate() will update it */ 531 rde->offset = 0; 532 i++; 533 num--; 534 } 535 536 done: 537 /* Skip over any unrecognized fields */ 538 *p = end; 539 return 0; 540 541 bad: 542 err = -EIO; 543 out_bad: 544 pr_err_client(cl, "problem parsing dir contents %d\n", err); 545 return err; 546 } 547 548 /* 549 * parse fcntl F_GETLK results 550 */ 551 static int parse_reply_info_filelock(void **p, void *end, 552 struct ceph_mds_reply_info_parsed *info, 553 u64 features) 554 { 555 if (*p + sizeof(*info->filelock_reply) > end) 556 goto bad; 557 558 info->filelock_reply = *p; 559 560 /* Skip over any unrecognized fields */ 561 *p = end; 562 return 0; 563 bad: 564 return -EIO; 565 } 566 567 568 #if BITS_PER_LONG == 64 569 570 #define DELEGATED_INO_AVAILABLE xa_mk_value(1) 571 572 static int ceph_parse_deleg_inos(void **p, void *end, 573 struct ceph_mds_session *s) 574 { 575 struct ceph_client *cl = s->s_mdsc->fsc->client; 576 u32 sets; 577 578 ceph_decode_32_safe(p, end, sets, bad); 579 doutc(cl, "got %u sets of delegated inodes\n", sets); 580 while (sets--) { 581 u64 start, len; 582 583 ceph_decode_64_safe(p, end, start, bad); 584 ceph_decode_64_safe(p, end, len, bad); 585 586 /* Don't accept a delegation of system inodes */ 587 if (start < CEPH_INO_SYSTEM_BASE) { 588 pr_warn_ratelimited_client(cl, 589 "ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n", 590 start, len); 591 continue; 592 } 593 while (len--) { 594 int err = xa_insert(&s->s_delegated_inos, start++, 595 DELEGATED_INO_AVAILABLE, 596 GFP_KERNEL); 597 if (!err) { 598 doutc(cl, "added delegated inode 0x%llx\n", start - 1); 599 } else if (err == -EBUSY) { 600 pr_warn_client(cl, 601 "MDS delegated inode 0x%llx more than once.\n", 602 start - 1); 603 } else { 604 return err; 605 } 606 } 607 } 608 return 0; 609 bad: 610 return -EIO; 611 } 612 613 u64 ceph_get_deleg_ino(struct ceph_mds_session *s) 614 { 615 unsigned long ino; 616 void *val; 617 618 xa_for_each(&s->s_delegated_inos, ino, val) { 619 val = xa_erase(&s->s_delegated_inos, ino); 620 if (val == DELEGATED_INO_AVAILABLE) 621 return ino; 622 } 623 return 0; 624 } 625 626 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) 627 { 628 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE, 629 GFP_KERNEL); 630 } 631 #else /* BITS_PER_LONG == 64 */ 632 /* 633 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just 634 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top 635 * and bottom words? 636 */ 637 static int ceph_parse_deleg_inos(void **p, void *end, 638 struct ceph_mds_session *s) 639 { 640 u32 sets; 641 642 ceph_decode_32_safe(p, end, sets, bad); 643 if (sets) 644 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad); 645 return 0; 646 bad: 647 return -EIO; 648 } 649 650 u64 ceph_get_deleg_ino(struct ceph_mds_session *s) 651 { 652 return 0; 653 } 654 655 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) 656 { 657 return 0; 658 } 659 #endif /* BITS_PER_LONG == 64 */ 660 661 /* 662 * parse create results 663 */ 664 static int parse_reply_info_create(void **p, void *end, 665 struct ceph_mds_reply_info_parsed *info, 666 u64 features, struct ceph_mds_session *s) 667 { 668 int ret; 669 670 if (features == (u64)-1 || 671 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) { 672 if (*p == end) { 673 /* Malformed reply? */ 674 info->has_create_ino = false; 675 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) { 676 info->has_create_ino = true; 677 /* struct_v, struct_compat, and len */ 678 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad); 679 ceph_decode_64_safe(p, end, info->ino, bad); 680 ret = ceph_parse_deleg_inos(p, end, s); 681 if (ret) 682 return ret; 683 } else { 684 /* legacy */ 685 ceph_decode_64_safe(p, end, info->ino, bad); 686 info->has_create_ino = true; 687 } 688 } else { 689 if (*p != end) 690 goto bad; 691 } 692 693 /* Skip over any unrecognized fields */ 694 *p = end; 695 return 0; 696 bad: 697 return -EIO; 698 } 699 700 static int parse_reply_info_getvxattr(void **p, void *end, 701 struct ceph_mds_reply_info_parsed *info, 702 u64 features) 703 { 704 u32 value_len; 705 706 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */ 707 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */ 708 ceph_decode_skip_32(p, end, bad); /* skip payload length */ 709 710 ceph_decode_32_safe(p, end, value_len, bad); 711 712 if (value_len == end - *p) { 713 info->xattr_info.xattr_value = *p; 714 info->xattr_info.xattr_value_len = value_len; 715 *p = end; 716 return value_len; 717 } 718 bad: 719 return -EIO; 720 } 721 722 /* 723 * parse extra results 724 */ 725 static int parse_reply_info_extra(void **p, void *end, 726 struct ceph_mds_request *req, 727 u64 features, struct ceph_mds_session *s) 728 { 729 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info; 730 u32 op = le32_to_cpu(info->head->op); 731 732 if (op == CEPH_MDS_OP_GETFILELOCK) 733 return parse_reply_info_filelock(p, end, info, features); 734 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP) 735 return parse_reply_info_readdir(p, end, req, features); 736 else if (op == CEPH_MDS_OP_CREATE) 737 return parse_reply_info_create(p, end, info, features, s); 738 else if (op == CEPH_MDS_OP_GETVXATTR) 739 return parse_reply_info_getvxattr(p, end, info, features); 740 else 741 return -EIO; 742 } 743 744 /* 745 * parse entire mds reply 746 */ 747 static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg, 748 struct ceph_mds_request *req, u64 features) 749 { 750 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info; 751 struct ceph_client *cl = s->s_mdsc->fsc->client; 752 void *p, *end; 753 u32 len; 754 int err; 755 756 info->head = msg->front.iov_base; 757 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); 758 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); 759 760 /* trace */ 761 ceph_decode_32_safe(&p, end, len, bad); 762 if (len > 0) { 763 ceph_decode_need(&p, end, len, bad); 764 err = parse_reply_info_trace(&p, p+len, info, features); 765 if (err < 0) 766 goto out_bad; 767 } 768 769 /* extra */ 770 ceph_decode_32_safe(&p, end, len, bad); 771 if (len > 0) { 772 ceph_decode_need(&p, end, len, bad); 773 err = parse_reply_info_extra(&p, p+len, req, features, s); 774 if (err < 0) 775 goto out_bad; 776 } 777 778 /* snap blob */ 779 ceph_decode_32_safe(&p, end, len, bad); 780 info->snapblob_len = len; 781 info->snapblob = p; 782 p += len; 783 784 if (p != end) 785 goto bad; 786 return 0; 787 788 bad: 789 err = -EIO; 790 out_bad: 791 pr_err_client(cl, "mds parse_reply err %d\n", err); 792 ceph_msg_dump(msg); 793 return err; 794 } 795 796 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) 797 { 798 int i; 799 800 kfree(info->diri.fscrypt_auth); 801 kfree(info->diri.fscrypt_file); 802 kfree(info->targeti.fscrypt_auth); 803 kfree(info->targeti.fscrypt_file); 804 if (!info->dir_entries) 805 return; 806 807 for (i = 0; i < info->dir_nr; i++) { 808 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; 809 810 kfree(rde->inode.fscrypt_auth); 811 kfree(rde->inode.fscrypt_file); 812 } 813 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size)); 814 } 815 816 /* 817 * In async unlink case the kclient won't wait for the first reply 818 * from MDS and just drop all the links and unhash the dentry and then 819 * succeeds immediately. 820 * 821 * For any new create/link/rename,etc requests followed by using the 822 * same file names we must wait for the first reply of the inflight 823 * unlink request, or the MDS possibly will fail these following 824 * requests with -EEXIST if the inflight async unlink request was 825 * delayed for some reasons. 826 * 827 * And the worst case is that for the none async openc request it will 828 * successfully open the file if the CDentry hasn't been unlinked yet, 829 * but later the previous delayed async unlink request will remove the 830 * CDenty. That means the just created file is possiblly deleted later 831 * by accident. 832 * 833 * We need to wait for the inflight async unlink requests to finish 834 * when creating new files/directories by using the same file names. 835 */ 836 int ceph_wait_on_conflict_unlink(struct dentry *dentry) 837 { 838 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); 839 struct ceph_client *cl = fsc->client; 840 struct dentry *pdentry = dentry->d_parent; 841 struct dentry *udentry, *found = NULL; 842 struct ceph_dentry_info *di; 843 struct qstr dname; 844 u32 hash = dentry->d_name.hash; 845 int err; 846 847 dname.name = dentry->d_name.name; 848 dname.len = dentry->d_name.len; 849 850 rcu_read_lock(); 851 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di, 852 hnode, hash) { 853 udentry = di->dentry; 854 855 spin_lock(&udentry->d_lock); 856 if (udentry->d_name.hash != hash) 857 goto next; 858 if (unlikely(udentry->d_parent != pdentry)) 859 goto next; 860 if (!hash_hashed(&di->hnode)) 861 goto next; 862 863 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) 864 pr_warn_client(cl, "dentry %p:%pd async unlink bit is not set\n", 865 dentry, dentry); 866 867 if (!d_same_name(udentry, pdentry, &dname)) 868 goto next; 869 870 found = dget_dlock(udentry); 871 spin_unlock(&udentry->d_lock); 872 break; 873 next: 874 spin_unlock(&udentry->d_lock); 875 } 876 rcu_read_unlock(); 877 878 if (likely(!found)) 879 return 0; 880 881 doutc(cl, "dentry %p:%pd conflict with old %p:%pd\n", dentry, dentry, 882 found, found); 883 884 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT, 885 TASK_KILLABLE); 886 dput(found); 887 return err; 888 } 889 890 891 /* 892 * sessions 893 */ 894 const char *ceph_session_state_name(int s) 895 { 896 switch (s) { 897 case CEPH_MDS_SESSION_NEW: return "new"; 898 case CEPH_MDS_SESSION_OPENING: return "opening"; 899 case CEPH_MDS_SESSION_OPEN: return "open"; 900 case CEPH_MDS_SESSION_HUNG: return "hung"; 901 case CEPH_MDS_SESSION_CLOSING: return "closing"; 902 case CEPH_MDS_SESSION_CLOSED: return "closed"; 903 case CEPH_MDS_SESSION_RESTARTING: return "restarting"; 904 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; 905 case CEPH_MDS_SESSION_REJECTED: return "rejected"; 906 default: return "???"; 907 } 908 } 909 910 struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s) 911 { 912 if (refcount_inc_not_zero(&s->s_ref)) 913 return s; 914 return NULL; 915 } 916 917 void ceph_put_mds_session(struct ceph_mds_session *s) 918 { 919 if (IS_ERR_OR_NULL(s)) 920 return; 921 922 if (refcount_dec_and_test(&s->s_ref)) { 923 if (s->s_auth.authorizer) 924 ceph_auth_destroy_authorizer(s->s_auth.authorizer); 925 WARN_ON(mutex_is_locked(&s->s_mutex)); 926 xa_destroy(&s->s_delegated_inos); 927 kfree(s); 928 } 929 } 930 931 /* 932 * called under mdsc->mutex 933 */ 934 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, 935 int mds) 936 { 937 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) 938 return NULL; 939 return ceph_get_mds_session(mdsc->sessions[mds]); 940 } 941 942 static bool __have_session(struct ceph_mds_client *mdsc, int mds) 943 { 944 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) 945 return false; 946 else 947 return true; 948 } 949 950 static int __verify_registered_session(struct ceph_mds_client *mdsc, 951 struct ceph_mds_session *s) 952 { 953 if (s->s_mds >= mdsc->max_sessions || 954 mdsc->sessions[s->s_mds] != s) 955 return -ENOENT; 956 return 0; 957 } 958 959 /* 960 * create+register a new session for given mds. 961 * called under mdsc->mutex. 962 */ 963 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, 964 int mds) 965 { 966 struct ceph_client *cl = mdsc->fsc->client; 967 struct ceph_mds_session *s; 968 969 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) 970 return ERR_PTR(-EIO); 971 972 if (mds >= mdsc->mdsmap->possible_max_rank) 973 return ERR_PTR(-EINVAL); 974 975 s = kzalloc(sizeof(*s), GFP_NOFS); 976 if (!s) 977 return ERR_PTR(-ENOMEM); 978 979 if (mds >= mdsc->max_sessions) { 980 int newmax = 1 << get_count_order(mds + 1); 981 struct ceph_mds_session **sa; 982 983 doutc(cl, "realloc to %d\n", newmax); 984 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); 985 if (!sa) 986 goto fail_realloc; 987 if (mdsc->sessions) { 988 memcpy(sa, mdsc->sessions, 989 mdsc->max_sessions * sizeof(void *)); 990 kfree(mdsc->sessions); 991 } 992 mdsc->sessions = sa; 993 mdsc->max_sessions = newmax; 994 } 995 996 doutc(cl, "mds%d\n", mds); 997 s->s_mdsc = mdsc; 998 s->s_mds = mds; 999 s->s_state = CEPH_MDS_SESSION_NEW; 1000 mutex_init(&s->s_mutex); 1001 1002 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); 1003 1004 atomic_set(&s->s_cap_gen, 1); 1005 s->s_cap_ttl = jiffies - 1; 1006 1007 spin_lock_init(&s->s_cap_lock); 1008 INIT_LIST_HEAD(&s->s_caps); 1009 refcount_set(&s->s_ref, 1); 1010 INIT_LIST_HEAD(&s->s_waiting); 1011 INIT_LIST_HEAD(&s->s_unsafe); 1012 xa_init(&s->s_delegated_inos); 1013 INIT_LIST_HEAD(&s->s_cap_releases); 1014 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work); 1015 1016 INIT_LIST_HEAD(&s->s_cap_dirty); 1017 INIT_LIST_HEAD(&s->s_cap_flushing); 1018 1019 mdsc->sessions[mds] = s; 1020 atomic_inc(&mdsc->num_sessions); 1021 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */ 1022 1023 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, 1024 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 1025 1026 return s; 1027 1028 fail_realloc: 1029 kfree(s); 1030 return ERR_PTR(-ENOMEM); 1031 } 1032 1033 /* 1034 * called under mdsc->mutex 1035 */ 1036 static void __unregister_session(struct ceph_mds_client *mdsc, 1037 struct ceph_mds_session *s) 1038 { 1039 doutc(mdsc->fsc->client, "mds%d %p\n", s->s_mds, s); 1040 BUG_ON(mdsc->sessions[s->s_mds] != s); 1041 mdsc->sessions[s->s_mds] = NULL; 1042 ceph_con_close(&s->s_con); 1043 ceph_put_mds_session(s); 1044 atomic_dec(&mdsc->num_sessions); 1045 } 1046 1047 /* 1048 * drop session refs in request. 1049 * 1050 * should be last request ref, or hold mdsc->mutex 1051 */ 1052 static void put_request_session(struct ceph_mds_request *req) 1053 { 1054 if (req->r_session) { 1055 ceph_put_mds_session(req->r_session); 1056 req->r_session = NULL; 1057 } 1058 } 1059 1060 void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 1061 void (*cb)(struct ceph_mds_session *), 1062 bool check_state) 1063 { 1064 int mds; 1065 1066 mutex_lock(&mdsc->mutex); 1067 for (mds = 0; mds < mdsc->max_sessions; ++mds) { 1068 struct ceph_mds_session *s; 1069 1070 s = __ceph_lookup_mds_session(mdsc, mds); 1071 if (!s) 1072 continue; 1073 1074 if (check_state && !check_session_state(s)) { 1075 ceph_put_mds_session(s); 1076 continue; 1077 } 1078 1079 mutex_unlock(&mdsc->mutex); 1080 cb(s); 1081 ceph_put_mds_session(s); 1082 mutex_lock(&mdsc->mutex); 1083 } 1084 mutex_unlock(&mdsc->mutex); 1085 } 1086 1087 void ceph_mdsc_release_request(struct kref *kref) 1088 { 1089 struct ceph_mds_request *req = container_of(kref, 1090 struct ceph_mds_request, 1091 r_kref); 1092 ceph_mdsc_release_dir_caps_async(req); 1093 destroy_reply_info(&req->r_reply_info); 1094 if (req->r_request) 1095 ceph_msg_put(req->r_request); 1096 if (req->r_reply) 1097 ceph_msg_put(req->r_reply); 1098 if (req->r_inode) { 1099 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 1100 iput(req->r_inode); 1101 } 1102 if (req->r_parent) { 1103 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN); 1104 iput(req->r_parent); 1105 } 1106 iput(req->r_target_inode); 1107 iput(req->r_new_inode); 1108 if (req->r_dentry) 1109 dput(req->r_dentry); 1110 if (req->r_old_dentry) 1111 dput(req->r_old_dentry); 1112 if (req->r_old_dentry_dir) { 1113 /* 1114 * track (and drop pins for) r_old_dentry_dir 1115 * separately, since r_old_dentry's d_parent may have 1116 * changed between the dir mutex being dropped and 1117 * this request being freed. 1118 */ 1119 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), 1120 CEPH_CAP_PIN); 1121 iput(req->r_old_dentry_dir); 1122 } 1123 kfree(req->r_path1); 1124 kfree(req->r_path2); 1125 put_cred(req->r_cred); 1126 if (req->r_mnt_idmap) 1127 mnt_idmap_put(req->r_mnt_idmap); 1128 if (req->r_pagelist) 1129 ceph_pagelist_release(req->r_pagelist); 1130 kfree(req->r_fscrypt_auth); 1131 kfree(req->r_altname); 1132 put_request_session(req); 1133 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); 1134 WARN_ON_ONCE(!list_empty(&req->r_wait)); 1135 kmem_cache_free(ceph_mds_request_cachep, req); 1136 } 1137 1138 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node) 1139 1140 /* 1141 * lookup session, bump ref if found. 1142 * 1143 * called under mdsc->mutex. 1144 */ 1145 static struct ceph_mds_request * 1146 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid) 1147 { 1148 struct ceph_mds_request *req; 1149 1150 req = lookup_request(&mdsc->request_tree, tid); 1151 if (req) 1152 ceph_mdsc_get_request(req); 1153 1154 return req; 1155 } 1156 1157 /* 1158 * Register an in-flight request, and assign a tid. Link to directory 1159 * are modifying (if any). 1160 * 1161 * Called under mdsc->mutex. 1162 */ 1163 static void __register_request(struct ceph_mds_client *mdsc, 1164 struct ceph_mds_request *req, 1165 struct inode *dir) 1166 { 1167 struct ceph_client *cl = mdsc->fsc->client; 1168 int ret = 0; 1169 1170 req->r_tid = ++mdsc->last_tid; 1171 if (req->r_num_caps) { 1172 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation, 1173 req->r_num_caps); 1174 if (ret < 0) { 1175 pr_err_client(cl, "%p failed to reserve caps: %d\n", 1176 req, ret); 1177 /* set req->r_err to fail early from __do_request */ 1178 req->r_err = ret; 1179 return; 1180 } 1181 } 1182 doutc(cl, "%p tid %lld\n", req, req->r_tid); 1183 ceph_mdsc_get_request(req); 1184 insert_request(&mdsc->request_tree, req); 1185 1186 req->r_cred = get_current_cred(); 1187 if (!req->r_mnt_idmap) 1188 req->r_mnt_idmap = &nop_mnt_idmap; 1189 1190 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) 1191 mdsc->oldest_tid = req->r_tid; 1192 1193 if (dir) { 1194 struct ceph_inode_info *ci = ceph_inode(dir); 1195 1196 ihold(dir); 1197 req->r_unsafe_dir = dir; 1198 spin_lock(&ci->i_unsafe_lock); 1199 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); 1200 spin_unlock(&ci->i_unsafe_lock); 1201 } 1202 } 1203 1204 static void __unregister_request(struct ceph_mds_client *mdsc, 1205 struct ceph_mds_request *req) 1206 { 1207 doutc(mdsc->fsc->client, "%p tid %lld\n", req, req->r_tid); 1208 1209 /* Never leave an unregistered request on an unsafe list! */ 1210 list_del_init(&req->r_unsafe_item); 1211 1212 if (req->r_tid == mdsc->oldest_tid) { 1213 struct rb_node *p = rb_next(&req->r_node); 1214 mdsc->oldest_tid = 0; 1215 while (p) { 1216 struct ceph_mds_request *next_req = 1217 rb_entry(p, struct ceph_mds_request, r_node); 1218 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { 1219 mdsc->oldest_tid = next_req->r_tid; 1220 break; 1221 } 1222 p = rb_next(p); 1223 } 1224 } 1225 1226 erase_request(&mdsc->request_tree, req); 1227 1228 if (req->r_unsafe_dir) { 1229 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); 1230 spin_lock(&ci->i_unsafe_lock); 1231 list_del_init(&req->r_unsafe_dir_item); 1232 spin_unlock(&ci->i_unsafe_lock); 1233 } 1234 if (req->r_target_inode && 1235 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 1236 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); 1237 spin_lock(&ci->i_unsafe_lock); 1238 list_del_init(&req->r_unsafe_target_item); 1239 spin_unlock(&ci->i_unsafe_lock); 1240 } 1241 1242 if (req->r_unsafe_dir) { 1243 iput(req->r_unsafe_dir); 1244 req->r_unsafe_dir = NULL; 1245 } 1246 1247 complete_all(&req->r_safe_completion); 1248 1249 ceph_mdsc_put_request(req); 1250 } 1251 1252 /* 1253 * Walk back up the dentry tree until we hit a dentry representing a 1254 * non-snapshot inode. We do this using the rcu_read_lock (which must be held 1255 * when calling this) to ensure that the objects won't disappear while we're 1256 * working with them. Once we hit a candidate dentry, we attempt to take a 1257 * reference to it, and return that as the result. 1258 */ 1259 static struct inode *get_nonsnap_parent(struct dentry *dentry) 1260 { 1261 struct inode *inode = NULL; 1262 1263 while (dentry && !IS_ROOT(dentry)) { 1264 inode = d_inode_rcu(dentry); 1265 if (!inode || ceph_snap(inode) == CEPH_NOSNAP) 1266 break; 1267 dentry = dentry->d_parent; 1268 } 1269 if (inode) 1270 inode = igrab(inode); 1271 return inode; 1272 } 1273 1274 /* 1275 * Choose mds to send request to next. If there is a hint set in the 1276 * request (e.g., due to a prior forward hint from the mds), use that. 1277 * Otherwise, consult frag tree and/or caps to identify the 1278 * appropriate mds. If all else fails, choose randomly. 1279 * 1280 * Called under mdsc->mutex. 1281 */ 1282 static int __choose_mds(struct ceph_mds_client *mdsc, 1283 struct ceph_mds_request *req, 1284 bool *random) 1285 { 1286 struct inode *inode; 1287 struct ceph_inode_info *ci; 1288 struct ceph_cap *cap; 1289 int mode = req->r_direct_mode; 1290 int mds = -1; 1291 u32 hash = req->r_direct_hash; 1292 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); 1293 struct ceph_client *cl = mdsc->fsc->client; 1294 1295 if (random) 1296 *random = false; 1297 1298 /* 1299 * is there a specific mds we should try? ignore hint if we have 1300 * no session and the mds is not up (active or recovering). 1301 */ 1302 if (req->r_resend_mds >= 0 && 1303 (__have_session(mdsc, req->r_resend_mds) || 1304 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { 1305 doutc(cl, "using resend_mds mds%d\n", req->r_resend_mds); 1306 return req->r_resend_mds; 1307 } 1308 1309 if (mode == USE_RANDOM_MDS) 1310 goto random; 1311 1312 inode = NULL; 1313 if (req->r_inode) { 1314 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) { 1315 inode = req->r_inode; 1316 ihold(inode); 1317 } else { 1318 /* req->r_dentry is non-null for LSSNAP request */ 1319 rcu_read_lock(); 1320 inode = get_nonsnap_parent(req->r_dentry); 1321 rcu_read_unlock(); 1322 doutc(cl, "using snapdir's parent %p %llx.%llx\n", 1323 inode, ceph_vinop(inode)); 1324 } 1325 } else if (req->r_dentry) { 1326 /* ignore race with rename; old or new d_parent is okay */ 1327 struct dentry *parent; 1328 struct inode *dir; 1329 1330 rcu_read_lock(); 1331 parent = READ_ONCE(req->r_dentry->d_parent); 1332 dir = req->r_parent ? : d_inode_rcu(parent); 1333 1334 if (!dir || dir->i_sb != mdsc->fsc->sb) { 1335 /* not this fs or parent went negative */ 1336 inode = d_inode(req->r_dentry); 1337 if (inode) 1338 ihold(inode); 1339 } else if (ceph_snap(dir) != CEPH_NOSNAP) { 1340 /* direct snapped/virtual snapdir requests 1341 * based on parent dir inode */ 1342 inode = get_nonsnap_parent(parent); 1343 doutc(cl, "using nonsnap parent %p %llx.%llx\n", 1344 inode, ceph_vinop(inode)); 1345 } else { 1346 /* dentry target */ 1347 inode = d_inode(req->r_dentry); 1348 if (!inode || mode == USE_AUTH_MDS) { 1349 /* dir + name */ 1350 inode = igrab(dir); 1351 hash = ceph_dentry_hash(dir, req->r_dentry); 1352 is_hash = true; 1353 } else { 1354 ihold(inode); 1355 } 1356 } 1357 rcu_read_unlock(); 1358 } 1359 1360 if (!inode) 1361 goto random; 1362 1363 doutc(cl, "%p %llx.%llx is_hash=%d (0x%x) mode %d\n", inode, 1364 ceph_vinop(inode), (int)is_hash, hash, mode); 1365 ci = ceph_inode(inode); 1366 1367 if (is_hash && S_ISDIR(inode->i_mode)) { 1368 struct ceph_inode_frag frag; 1369 int found; 1370 1371 ceph_choose_frag(ci, hash, &frag, &found); 1372 if (found) { 1373 if (mode == USE_ANY_MDS && frag.ndist > 0) { 1374 u8 r; 1375 1376 /* choose a random replica */ 1377 get_random_bytes(&r, 1); 1378 r %= frag.ndist; 1379 mds = frag.dist[r]; 1380 doutc(cl, "%p %llx.%llx frag %u mds%d (%d/%d)\n", 1381 inode, ceph_vinop(inode), frag.frag, 1382 mds, (int)r, frag.ndist); 1383 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 1384 CEPH_MDS_STATE_ACTIVE && 1385 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds)) 1386 goto out; 1387 } 1388 1389 /* since this file/dir wasn't known to be 1390 * replicated, then we want to look for the 1391 * authoritative mds. */ 1392 if (frag.mds >= 0) { 1393 /* choose auth mds */ 1394 mds = frag.mds; 1395 doutc(cl, "%p %llx.%llx frag %u mds%d (auth)\n", 1396 inode, ceph_vinop(inode), frag.frag, mds); 1397 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= 1398 CEPH_MDS_STATE_ACTIVE) { 1399 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap, 1400 mds)) 1401 goto out; 1402 } 1403 } 1404 mode = USE_AUTH_MDS; 1405 } 1406 } 1407 1408 spin_lock(&ci->i_ceph_lock); 1409 cap = NULL; 1410 if (mode == USE_AUTH_MDS) 1411 cap = ci->i_auth_cap; 1412 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) 1413 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); 1414 if (!cap) { 1415 spin_unlock(&ci->i_ceph_lock); 1416 iput(inode); 1417 goto random; 1418 } 1419 mds = cap->session->s_mds; 1420 doutc(cl, "%p %llx.%llx mds%d (%scap %p)\n", inode, 1421 ceph_vinop(inode), mds, 1422 cap == ci->i_auth_cap ? "auth " : "", cap); 1423 spin_unlock(&ci->i_ceph_lock); 1424 out: 1425 iput(inode); 1426 return mds; 1427 1428 random: 1429 if (random) 1430 *random = true; 1431 1432 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); 1433 doutc(cl, "chose random mds%d\n", mds); 1434 return mds; 1435 } 1436 1437 1438 /* 1439 * session messages 1440 */ 1441 struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq) 1442 { 1443 struct ceph_msg *msg; 1444 struct ceph_mds_session_head *h; 1445 1446 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, 1447 false); 1448 if (!msg) { 1449 pr_err("ENOMEM creating session %s msg\n", 1450 ceph_session_op_name(op)); 1451 return NULL; 1452 } 1453 h = msg->front.iov_base; 1454 h->op = cpu_to_le32(op); 1455 h->seq = cpu_to_le64(seq); 1456 1457 return msg; 1458 } 1459 1460 static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED; 1461 #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8) 1462 static int encode_supported_features(void **p, void *end) 1463 { 1464 static const size_t count = ARRAY_SIZE(feature_bits); 1465 1466 if (count > 0) { 1467 size_t i; 1468 size_t size = FEATURE_BYTES(count); 1469 unsigned long bit; 1470 1471 if (WARN_ON_ONCE(*p + 4 + size > end)) 1472 return -ERANGE; 1473 1474 ceph_encode_32(p, size); 1475 memset(*p, 0, size); 1476 for (i = 0; i < count; i++) { 1477 bit = feature_bits[i]; 1478 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8); 1479 } 1480 *p += size; 1481 } else { 1482 if (WARN_ON_ONCE(*p + 4 > end)) 1483 return -ERANGE; 1484 1485 ceph_encode_32(p, 0); 1486 } 1487 1488 return 0; 1489 } 1490 1491 static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED; 1492 #define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8) 1493 static int encode_metric_spec(void **p, void *end) 1494 { 1495 static const size_t count = ARRAY_SIZE(metric_bits); 1496 1497 /* header */ 1498 if (WARN_ON_ONCE(*p + 2 > end)) 1499 return -ERANGE; 1500 1501 ceph_encode_8(p, 1); /* version */ 1502 ceph_encode_8(p, 1); /* compat */ 1503 1504 if (count > 0) { 1505 size_t i; 1506 size_t size = METRIC_BYTES(count); 1507 1508 if (WARN_ON_ONCE(*p + 4 + 4 + size > end)) 1509 return -ERANGE; 1510 1511 /* metric spec info length */ 1512 ceph_encode_32(p, 4 + size); 1513 1514 /* metric spec */ 1515 ceph_encode_32(p, size); 1516 memset(*p, 0, size); 1517 for (i = 0; i < count; i++) 1518 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8); 1519 *p += size; 1520 } else { 1521 if (WARN_ON_ONCE(*p + 4 + 4 > end)) 1522 return -ERANGE; 1523 1524 /* metric spec info length */ 1525 ceph_encode_32(p, 4); 1526 /* metric spec */ 1527 ceph_encode_32(p, 0); 1528 } 1529 1530 return 0; 1531 } 1532 1533 /* 1534 * session message, specialization for CEPH_SESSION_REQUEST_OPEN 1535 * to include additional client metadata fields. 1536 */ 1537 static struct ceph_msg * 1538 create_session_full_msg(struct ceph_mds_client *mdsc, int op, u64 seq) 1539 { 1540 struct ceph_msg *msg; 1541 struct ceph_mds_session_head *h; 1542 int i; 1543 int extra_bytes = 0; 1544 int metadata_key_count = 0; 1545 struct ceph_options *opt = mdsc->fsc->client->options; 1546 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options; 1547 struct ceph_client *cl = mdsc->fsc->client; 1548 size_t size, count; 1549 void *p, *end; 1550 int ret; 1551 1552 const char* metadata[][2] = { 1553 {"hostname", mdsc->nodename}, 1554 {"kernel_version", init_utsname()->release}, 1555 {"entity_id", opt->name ? : ""}, 1556 {"root", fsopt->server_path ? : "/"}, 1557 {NULL, NULL} 1558 }; 1559 1560 /* Calculate serialized length of metadata */ 1561 extra_bytes = 4; /* map length */ 1562 for (i = 0; metadata[i][0]; ++i) { 1563 extra_bytes += 8 + strlen(metadata[i][0]) + 1564 strlen(metadata[i][1]); 1565 metadata_key_count++; 1566 } 1567 1568 /* supported feature */ 1569 size = 0; 1570 count = ARRAY_SIZE(feature_bits); 1571 if (count > 0) 1572 size = FEATURE_BYTES(count); 1573 extra_bytes += 4 + size; 1574 1575 /* metric spec */ 1576 size = 0; 1577 count = ARRAY_SIZE(metric_bits); 1578 if (count > 0) 1579 size = METRIC_BYTES(count); 1580 extra_bytes += 2 + 4 + 4 + size; 1581 1582 /* flags, mds auth caps and oldest_client_tid */ 1583 extra_bytes += 4 + 4 + 8; 1584 1585 /* Allocate the message */ 1586 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes, 1587 GFP_NOFS, false); 1588 if (!msg) { 1589 pr_err_client(cl, "ENOMEM creating session open msg\n"); 1590 return ERR_PTR(-ENOMEM); 1591 } 1592 p = msg->front.iov_base; 1593 end = p + msg->front.iov_len; 1594 1595 h = p; 1596 h->op = cpu_to_le32(op); 1597 h->seq = cpu_to_le64(seq); 1598 1599 /* 1600 * Serialize client metadata into waiting buffer space, using 1601 * the format that userspace expects for map<string, string> 1602 * 1603 * ClientSession messages with metadata are v7 1604 */ 1605 msg->hdr.version = cpu_to_le16(7); 1606 msg->hdr.compat_version = cpu_to_le16(1); 1607 1608 /* The write pointer, following the session_head structure */ 1609 p += sizeof(*h); 1610 1611 /* Number of entries in the map */ 1612 ceph_encode_32(&p, metadata_key_count); 1613 1614 /* Two length-prefixed strings for each entry in the map */ 1615 for (i = 0; metadata[i][0]; ++i) { 1616 size_t const key_len = strlen(metadata[i][0]); 1617 size_t const val_len = strlen(metadata[i][1]); 1618 1619 ceph_encode_32(&p, key_len); 1620 memcpy(p, metadata[i][0], key_len); 1621 p += key_len; 1622 ceph_encode_32(&p, val_len); 1623 memcpy(p, metadata[i][1], val_len); 1624 p += val_len; 1625 } 1626 1627 ret = encode_supported_features(&p, end); 1628 if (ret) { 1629 pr_err_client(cl, "encode_supported_features failed!\n"); 1630 ceph_msg_put(msg); 1631 return ERR_PTR(ret); 1632 } 1633 1634 ret = encode_metric_spec(&p, end); 1635 if (ret) { 1636 pr_err_client(cl, "encode_metric_spec failed!\n"); 1637 ceph_msg_put(msg); 1638 return ERR_PTR(ret); 1639 } 1640 1641 /* version == 5, flags */ 1642 ceph_encode_32(&p, 0); 1643 1644 /* version == 6, mds auth caps */ 1645 ceph_encode_32(&p, 0); 1646 1647 /* version == 7, oldest_client_tid */ 1648 ceph_encode_64(&p, mdsc->oldest_tid); 1649 1650 msg->front.iov_len = p - msg->front.iov_base; 1651 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 1652 1653 return msg; 1654 } 1655 1656 /* 1657 * send session open request. 1658 * 1659 * called under mdsc->mutex 1660 */ 1661 static int __open_session(struct ceph_mds_client *mdsc, 1662 struct ceph_mds_session *session) 1663 { 1664 struct ceph_msg *msg; 1665 int mstate; 1666 int mds = session->s_mds; 1667 1668 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) 1669 return -EIO; 1670 1671 /* wait for mds to go active? */ 1672 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); 1673 doutc(mdsc->fsc->client, "open_session to mds%d (%s)\n", mds, 1674 ceph_mds_state_name(mstate)); 1675 session->s_state = CEPH_MDS_SESSION_OPENING; 1676 session->s_renew_requested = jiffies; 1677 1678 /* send connect message */ 1679 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_OPEN, 1680 session->s_seq); 1681 if (IS_ERR(msg)) 1682 return PTR_ERR(msg); 1683 ceph_con_send(&session->s_con, msg); 1684 return 0; 1685 } 1686 1687 /* 1688 * open sessions for any export targets for the given mds 1689 * 1690 * called under mdsc->mutex 1691 */ 1692 static struct ceph_mds_session * 1693 __open_export_target_session(struct ceph_mds_client *mdsc, int target) 1694 { 1695 struct ceph_mds_session *session; 1696 int ret; 1697 1698 session = __ceph_lookup_mds_session(mdsc, target); 1699 if (!session) { 1700 session = register_session(mdsc, target); 1701 if (IS_ERR(session)) 1702 return session; 1703 } 1704 if (session->s_state == CEPH_MDS_SESSION_NEW || 1705 session->s_state == CEPH_MDS_SESSION_CLOSING) { 1706 ret = __open_session(mdsc, session); 1707 if (ret) 1708 return ERR_PTR(ret); 1709 } 1710 1711 return session; 1712 } 1713 1714 struct ceph_mds_session * 1715 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) 1716 { 1717 struct ceph_mds_session *session; 1718 struct ceph_client *cl = mdsc->fsc->client; 1719 1720 doutc(cl, "to mds%d\n", target); 1721 1722 mutex_lock(&mdsc->mutex); 1723 session = __open_export_target_session(mdsc, target); 1724 mutex_unlock(&mdsc->mutex); 1725 1726 return session; 1727 } 1728 1729 static void __open_export_target_sessions(struct ceph_mds_client *mdsc, 1730 struct ceph_mds_session *session) 1731 { 1732 struct ceph_mds_info *mi; 1733 struct ceph_mds_session *ts; 1734 int i, mds = session->s_mds; 1735 struct ceph_client *cl = mdsc->fsc->client; 1736 1737 if (mds >= mdsc->mdsmap->possible_max_rank) 1738 return; 1739 1740 mi = &mdsc->mdsmap->m_info[mds]; 1741 doutc(cl, "for mds%d (%d targets)\n", session->s_mds, 1742 mi->num_export_targets); 1743 1744 for (i = 0; i < mi->num_export_targets; i++) { 1745 ts = __open_export_target_session(mdsc, mi->export_targets[i]); 1746 ceph_put_mds_session(ts); 1747 } 1748 } 1749 1750 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, 1751 struct ceph_mds_session *session) 1752 { 1753 mutex_lock(&mdsc->mutex); 1754 __open_export_target_sessions(mdsc, session); 1755 mutex_unlock(&mdsc->mutex); 1756 } 1757 1758 /* 1759 * session caps 1760 */ 1761 1762 static void detach_cap_releases(struct ceph_mds_session *session, 1763 struct list_head *target) 1764 { 1765 struct ceph_client *cl = session->s_mdsc->fsc->client; 1766 1767 lockdep_assert_held(&session->s_cap_lock); 1768 1769 list_splice_init(&session->s_cap_releases, target); 1770 session->s_num_cap_releases = 0; 1771 doutc(cl, "mds%d\n", session->s_mds); 1772 } 1773 1774 static void dispose_cap_releases(struct ceph_mds_client *mdsc, 1775 struct list_head *dispose) 1776 { 1777 while (!list_empty(dispose)) { 1778 struct ceph_cap *cap; 1779 /* zero out the in-progress message */ 1780 cap = list_first_entry(dispose, struct ceph_cap, session_caps); 1781 list_del(&cap->session_caps); 1782 ceph_put_cap(mdsc, cap); 1783 } 1784 } 1785 1786 static void cleanup_session_requests(struct ceph_mds_client *mdsc, 1787 struct ceph_mds_session *session) 1788 { 1789 struct ceph_client *cl = mdsc->fsc->client; 1790 struct ceph_mds_request *req; 1791 struct rb_node *p; 1792 1793 doutc(cl, "mds%d\n", session->s_mds); 1794 mutex_lock(&mdsc->mutex); 1795 while (!list_empty(&session->s_unsafe)) { 1796 req = list_first_entry(&session->s_unsafe, 1797 struct ceph_mds_request, r_unsafe_item); 1798 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n", 1799 req->r_tid); 1800 if (req->r_target_inode) 1801 mapping_set_error(req->r_target_inode->i_mapping, -EIO); 1802 if (req->r_unsafe_dir) 1803 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO); 1804 __unregister_request(mdsc, req); 1805 } 1806 /* zero r_attempts, so kick_requests() will re-send requests */ 1807 p = rb_first(&mdsc->request_tree); 1808 while (p) { 1809 req = rb_entry(p, struct ceph_mds_request, r_node); 1810 p = rb_next(p); 1811 if (req->r_session && 1812 req->r_session->s_mds == session->s_mds) 1813 req->r_attempts = 0; 1814 } 1815 mutex_unlock(&mdsc->mutex); 1816 } 1817 1818 /* 1819 * Helper to safely iterate over all caps associated with a session, with 1820 * special care taken to handle a racing __ceph_remove_cap(). 1821 * 1822 * Caller must hold session s_mutex. 1823 */ 1824 int ceph_iterate_session_caps(struct ceph_mds_session *session, 1825 int (*cb)(struct inode *, int mds, void *), 1826 void *arg) 1827 { 1828 struct ceph_client *cl = session->s_mdsc->fsc->client; 1829 struct list_head *p; 1830 struct ceph_cap *cap; 1831 struct inode *inode, *last_inode = NULL; 1832 struct ceph_cap *old_cap = NULL; 1833 int ret; 1834 1835 doutc(cl, "%p mds%d\n", session, session->s_mds); 1836 spin_lock(&session->s_cap_lock); 1837 p = session->s_caps.next; 1838 while (p != &session->s_caps) { 1839 int mds; 1840 1841 cap = list_entry(p, struct ceph_cap, session_caps); 1842 inode = igrab(&cap->ci->netfs.inode); 1843 if (!inode) { 1844 p = p->next; 1845 continue; 1846 } 1847 session->s_cap_iterator = cap; 1848 mds = cap->mds; 1849 spin_unlock(&session->s_cap_lock); 1850 1851 if (last_inode) { 1852 iput(last_inode); 1853 last_inode = NULL; 1854 } 1855 if (old_cap) { 1856 ceph_put_cap(session->s_mdsc, old_cap); 1857 old_cap = NULL; 1858 } 1859 1860 ret = cb(inode, mds, arg); 1861 last_inode = inode; 1862 1863 spin_lock(&session->s_cap_lock); 1864 p = p->next; 1865 if (!cap->ci) { 1866 doutc(cl, "finishing cap %p removal\n", cap); 1867 BUG_ON(cap->session != session); 1868 cap->session = NULL; 1869 list_del_init(&cap->session_caps); 1870 session->s_nr_caps--; 1871 atomic64_dec(&session->s_mdsc->metric.total_caps); 1872 if (cap->queue_release) 1873 __ceph_queue_cap_release(session, cap); 1874 else 1875 old_cap = cap; /* put_cap it w/o locks held */ 1876 } 1877 if (ret < 0) 1878 goto out; 1879 } 1880 ret = 0; 1881 out: 1882 session->s_cap_iterator = NULL; 1883 spin_unlock(&session->s_cap_lock); 1884 1885 iput(last_inode); 1886 if (old_cap) 1887 ceph_put_cap(session->s_mdsc, old_cap); 1888 1889 return ret; 1890 } 1891 1892 static int remove_session_caps_cb(struct inode *inode, int mds, void *arg) 1893 { 1894 struct ceph_inode_info *ci = ceph_inode(inode); 1895 struct ceph_client *cl = ceph_inode_to_client(inode); 1896 bool invalidate = false; 1897 struct ceph_cap *cap; 1898 int iputs = 0; 1899 1900 spin_lock(&ci->i_ceph_lock); 1901 cap = __get_cap_for_mds(ci, mds); 1902 if (cap) { 1903 doutc(cl, " removing cap %p, ci is %p, inode is %p\n", 1904 cap, ci, &ci->netfs.inode); 1905 1906 iputs = ceph_purge_inode_cap(inode, cap, &invalidate); 1907 } 1908 spin_unlock(&ci->i_ceph_lock); 1909 1910 if (cap) 1911 wake_up_all(&ci->i_cap_wq); 1912 if (invalidate) 1913 ceph_queue_invalidate(inode); 1914 while (iputs--) 1915 iput(inode); 1916 return 0; 1917 } 1918 1919 /* 1920 * caller must hold session s_mutex 1921 */ 1922 static void remove_session_caps(struct ceph_mds_session *session) 1923 { 1924 struct ceph_fs_client *fsc = session->s_mdsc->fsc; 1925 struct super_block *sb = fsc->sb; 1926 LIST_HEAD(dispose); 1927 1928 doutc(fsc->client, "on %p\n", session); 1929 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc); 1930 1931 wake_up_all(&fsc->mdsc->cap_flushing_wq); 1932 1933 spin_lock(&session->s_cap_lock); 1934 if (session->s_nr_caps > 0) { 1935 struct inode *inode; 1936 struct ceph_cap *cap, *prev = NULL; 1937 struct ceph_vino vino; 1938 /* 1939 * iterate_session_caps() skips inodes that are being 1940 * deleted, we need to wait until deletions are complete. 1941 * __wait_on_freeing_inode() is designed for the job, 1942 * but it is not exported, so use lookup inode function 1943 * to access it. 1944 */ 1945 while (!list_empty(&session->s_caps)) { 1946 cap = list_entry(session->s_caps.next, 1947 struct ceph_cap, session_caps); 1948 if (cap == prev) 1949 break; 1950 prev = cap; 1951 vino = cap->ci->i_vino; 1952 spin_unlock(&session->s_cap_lock); 1953 1954 inode = ceph_find_inode(sb, vino); 1955 iput(inode); 1956 1957 spin_lock(&session->s_cap_lock); 1958 } 1959 } 1960 1961 // drop cap expires and unlock s_cap_lock 1962 detach_cap_releases(session, &dispose); 1963 1964 BUG_ON(session->s_nr_caps > 0); 1965 BUG_ON(!list_empty(&session->s_cap_flushing)); 1966 spin_unlock(&session->s_cap_lock); 1967 dispose_cap_releases(session->s_mdsc, &dispose); 1968 } 1969 1970 enum { 1971 RECONNECT, 1972 RENEWCAPS, 1973 FORCE_RO, 1974 }; 1975 1976 /* 1977 * wake up any threads waiting on this session's caps. if the cap is 1978 * old (didn't get renewed on the client reconnect), remove it now. 1979 * 1980 * caller must hold s_mutex. 1981 */ 1982 static int wake_up_session_cb(struct inode *inode, int mds, void *arg) 1983 { 1984 struct ceph_inode_info *ci = ceph_inode(inode); 1985 unsigned long ev = (unsigned long)arg; 1986 1987 if (ev == RECONNECT) { 1988 spin_lock(&ci->i_ceph_lock); 1989 ci->i_wanted_max_size = 0; 1990 ci->i_requested_max_size = 0; 1991 spin_unlock(&ci->i_ceph_lock); 1992 } else if (ev == RENEWCAPS) { 1993 struct ceph_cap *cap; 1994 1995 spin_lock(&ci->i_ceph_lock); 1996 cap = __get_cap_for_mds(ci, mds); 1997 /* mds did not re-issue stale cap */ 1998 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) 1999 cap->issued = cap->implemented = CEPH_CAP_PIN; 2000 spin_unlock(&ci->i_ceph_lock); 2001 } else if (ev == FORCE_RO) { 2002 } 2003 wake_up_all(&ci->i_cap_wq); 2004 return 0; 2005 } 2006 2007 static void wake_up_session_caps(struct ceph_mds_session *session, int ev) 2008 { 2009 struct ceph_client *cl = session->s_mdsc->fsc->client; 2010 2011 doutc(cl, "session %p mds%d\n", session, session->s_mds); 2012 ceph_iterate_session_caps(session, wake_up_session_cb, 2013 (void *)(unsigned long)ev); 2014 } 2015 2016 /* 2017 * Send periodic message to MDS renewing all currently held caps. The 2018 * ack will reset the expiration for all caps from this session. 2019 * 2020 * caller holds s_mutex 2021 */ 2022 static int send_renew_caps(struct ceph_mds_client *mdsc, 2023 struct ceph_mds_session *session) 2024 { 2025 struct ceph_client *cl = mdsc->fsc->client; 2026 struct ceph_msg *msg; 2027 int state; 2028 2029 if (time_after_eq(jiffies, session->s_cap_ttl) && 2030 time_after_eq(session->s_cap_ttl, session->s_renew_requested)) 2031 pr_info_client(cl, "mds%d caps stale\n", session->s_mds); 2032 session->s_renew_requested = jiffies; 2033 2034 /* do not try to renew caps until a recovering mds has reconnected 2035 * with its clients. */ 2036 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); 2037 if (state < CEPH_MDS_STATE_RECONNECT) { 2038 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds, 2039 ceph_mds_state_name(state)); 2040 return 0; 2041 } 2042 2043 doutc(cl, "to mds%d (%s)\n", session->s_mds, 2044 ceph_mds_state_name(state)); 2045 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS, 2046 ++session->s_renew_seq); 2047 if (IS_ERR(msg)) 2048 return PTR_ERR(msg); 2049 ceph_con_send(&session->s_con, msg); 2050 return 0; 2051 } 2052 2053 static int send_flushmsg_ack(struct ceph_mds_client *mdsc, 2054 struct ceph_mds_session *session, u64 seq) 2055 { 2056 struct ceph_client *cl = mdsc->fsc->client; 2057 struct ceph_msg *msg; 2058 2059 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds, 2060 ceph_session_state_name(session->s_state), seq); 2061 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); 2062 if (!msg) 2063 return -ENOMEM; 2064 ceph_con_send(&session->s_con, msg); 2065 return 0; 2066 } 2067 2068 2069 /* 2070 * Note new cap ttl, and any transition from stale -> not stale (fresh?). 2071 * 2072 * Called under session->s_mutex 2073 */ 2074 static void renewed_caps(struct ceph_mds_client *mdsc, 2075 struct ceph_mds_session *session, int is_renew) 2076 { 2077 struct ceph_client *cl = mdsc->fsc->client; 2078 int was_stale; 2079 int wake = 0; 2080 2081 spin_lock(&session->s_cap_lock); 2082 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); 2083 2084 session->s_cap_ttl = session->s_renew_requested + 2085 mdsc->mdsmap->m_session_timeout*HZ; 2086 2087 if (was_stale) { 2088 if (time_before(jiffies, session->s_cap_ttl)) { 2089 pr_info_client(cl, "mds%d caps renewed\n", 2090 session->s_mds); 2091 wake = 1; 2092 } else { 2093 pr_info_client(cl, "mds%d caps still stale\n", 2094 session->s_mds); 2095 } 2096 } 2097 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds, 2098 session->s_cap_ttl, was_stale ? "stale" : "fresh", 2099 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); 2100 spin_unlock(&session->s_cap_lock); 2101 2102 if (wake) 2103 wake_up_session_caps(session, RENEWCAPS); 2104 } 2105 2106 /* 2107 * send a session close request 2108 */ 2109 static int request_close_session(struct ceph_mds_session *session) 2110 { 2111 struct ceph_client *cl = session->s_mdsc->fsc->client; 2112 struct ceph_msg *msg; 2113 2114 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds, 2115 ceph_session_state_name(session->s_state), session->s_seq); 2116 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE, 2117 session->s_seq); 2118 if (!msg) 2119 return -ENOMEM; 2120 ceph_con_send(&session->s_con, msg); 2121 return 1; 2122 } 2123 2124 /* 2125 * Called with s_mutex held. 2126 */ 2127 static int __close_session(struct ceph_mds_client *mdsc, 2128 struct ceph_mds_session *session) 2129 { 2130 if (session->s_state >= CEPH_MDS_SESSION_CLOSING) 2131 return 0; 2132 session->s_state = CEPH_MDS_SESSION_CLOSING; 2133 return request_close_session(session); 2134 } 2135 2136 static bool drop_negative_children(struct dentry *dentry) 2137 { 2138 struct dentry *child; 2139 bool all_negative = true; 2140 2141 if (!d_is_dir(dentry)) 2142 goto out; 2143 2144 spin_lock(&dentry->d_lock); 2145 hlist_for_each_entry(child, &dentry->d_children, d_sib) { 2146 if (d_really_is_positive(child)) { 2147 all_negative = false; 2148 break; 2149 } 2150 } 2151 spin_unlock(&dentry->d_lock); 2152 2153 if (all_negative) 2154 shrink_dcache_parent(dentry); 2155 out: 2156 return all_negative; 2157 } 2158 2159 /* 2160 * Trim old(er) caps. 2161 * 2162 * Because we can't cache an inode without one or more caps, we do 2163 * this indirectly: if a cap is unused, we prune its aliases, at which 2164 * point the inode will hopefully get dropped to. 2165 * 2166 * Yes, this is a bit sloppy. Our only real goal here is to respond to 2167 * memory pressure from the MDS, though, so it needn't be perfect. 2168 */ 2169 static int trim_caps_cb(struct inode *inode, int mds, void *arg) 2170 { 2171 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 2172 struct ceph_client *cl = mdsc->fsc->client; 2173 int *remaining = arg; 2174 struct ceph_inode_info *ci = ceph_inode(inode); 2175 int used, wanted, oissued, mine; 2176 struct ceph_cap *cap; 2177 2178 if (*remaining <= 0) 2179 return -1; 2180 2181 spin_lock(&ci->i_ceph_lock); 2182 cap = __get_cap_for_mds(ci, mds); 2183 if (!cap) { 2184 spin_unlock(&ci->i_ceph_lock); 2185 return 0; 2186 } 2187 mine = cap->issued | cap->implemented; 2188 used = __ceph_caps_used(ci); 2189 wanted = __ceph_caps_file_wanted(ci); 2190 oissued = __ceph_caps_issued_other(ci, cap); 2191 2192 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n", 2193 inode, ceph_vinop(inode), cap, ceph_cap_string(mine), 2194 ceph_cap_string(oissued), ceph_cap_string(used), 2195 ceph_cap_string(wanted)); 2196 if (cap == ci->i_auth_cap) { 2197 if (ci->i_dirty_caps || ci->i_flushing_caps || 2198 !list_empty(&ci->i_cap_snaps)) 2199 goto out; 2200 if ((used | wanted) & CEPH_CAP_ANY_WR) 2201 goto out; 2202 /* Note: it's possible that i_filelock_ref becomes non-zero 2203 * after dropping auth caps. It doesn't hurt because reply 2204 * of lock mds request will re-add auth caps. */ 2205 if (atomic_read(&ci->i_filelock_ref) > 0) 2206 goto out; 2207 } 2208 /* The inode has cached pages, but it's no longer used. 2209 * we can safely drop it */ 2210 if (S_ISREG(inode->i_mode) && 2211 wanted == 0 && used == CEPH_CAP_FILE_CACHE && 2212 !(oissued & CEPH_CAP_FILE_CACHE)) { 2213 used = 0; 2214 oissued = 0; 2215 } 2216 if ((used | wanted) & ~oissued & mine) 2217 goto out; /* we need these caps */ 2218 2219 if (oissued) { 2220 /* we aren't the only cap.. just remove us */ 2221 ceph_remove_cap(mdsc, cap, true); 2222 (*remaining)--; 2223 } else { 2224 struct dentry *dentry; 2225 /* try dropping referring dentries */ 2226 spin_unlock(&ci->i_ceph_lock); 2227 dentry = d_find_any_alias(inode); 2228 if (dentry && drop_negative_children(dentry)) { 2229 int count; 2230 dput(dentry); 2231 d_prune_aliases(inode); 2232 count = atomic_read(&inode->i_count); 2233 if (count == 1) 2234 (*remaining)--; 2235 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n", 2236 inode, ceph_vinop(inode), cap, count); 2237 } else { 2238 dput(dentry); 2239 } 2240 return 0; 2241 } 2242 2243 out: 2244 spin_unlock(&ci->i_ceph_lock); 2245 return 0; 2246 } 2247 2248 /* 2249 * Trim session cap count down to some max number. 2250 */ 2251 int ceph_trim_caps(struct ceph_mds_client *mdsc, 2252 struct ceph_mds_session *session, 2253 int max_caps) 2254 { 2255 struct ceph_client *cl = mdsc->fsc->client; 2256 int trim_caps = session->s_nr_caps - max_caps; 2257 2258 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds, 2259 session->s_nr_caps, max_caps, trim_caps); 2260 if (trim_caps > 0) { 2261 int remaining = trim_caps; 2262 2263 ceph_iterate_session_caps(session, trim_caps_cb, &remaining); 2264 doutc(cl, "mds%d done: %d / %d, trimmed %d\n", 2265 session->s_mds, session->s_nr_caps, max_caps, 2266 trim_caps - remaining); 2267 } 2268 2269 ceph_flush_cap_releases(mdsc, session); 2270 return 0; 2271 } 2272 2273 static int check_caps_flush(struct ceph_mds_client *mdsc, 2274 u64 want_flush_tid) 2275 { 2276 struct ceph_client *cl = mdsc->fsc->client; 2277 int ret = 1; 2278 2279 spin_lock(&mdsc->cap_dirty_lock); 2280 if (!list_empty(&mdsc->cap_flush_list)) { 2281 struct ceph_cap_flush *cf = 2282 list_first_entry(&mdsc->cap_flush_list, 2283 struct ceph_cap_flush, g_list); 2284 if (cf->tid <= want_flush_tid) { 2285 doutc(cl, "still flushing tid %llu <= %llu\n", 2286 cf->tid, want_flush_tid); 2287 ret = 0; 2288 } 2289 } 2290 spin_unlock(&mdsc->cap_dirty_lock); 2291 return ret; 2292 } 2293 2294 /* 2295 * flush all dirty inode data to disk. 2296 * 2297 * returns true if we've flushed through want_flush_tid 2298 */ 2299 static void wait_caps_flush(struct ceph_mds_client *mdsc, 2300 u64 want_flush_tid) 2301 { 2302 struct ceph_client *cl = mdsc->fsc->client; 2303 2304 doutc(cl, "want %llu\n", want_flush_tid); 2305 2306 wait_event(mdsc->cap_flushing_wq, 2307 check_caps_flush(mdsc, want_flush_tid)); 2308 2309 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid); 2310 } 2311 2312 /* 2313 * called under s_mutex 2314 */ 2315 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc, 2316 struct ceph_mds_session *session) 2317 { 2318 struct ceph_client *cl = mdsc->fsc->client; 2319 struct ceph_msg *msg = NULL; 2320 struct ceph_mds_cap_release *head; 2321 struct ceph_mds_cap_item *item; 2322 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; 2323 struct ceph_cap *cap; 2324 LIST_HEAD(tmp_list); 2325 int num_cap_releases; 2326 __le32 barrier, *cap_barrier; 2327 2328 down_read(&osdc->lock); 2329 barrier = cpu_to_le32(osdc->epoch_barrier); 2330 up_read(&osdc->lock); 2331 2332 spin_lock(&session->s_cap_lock); 2333 again: 2334 list_splice_init(&session->s_cap_releases, &tmp_list); 2335 num_cap_releases = session->s_num_cap_releases; 2336 session->s_num_cap_releases = 0; 2337 spin_unlock(&session->s_cap_lock); 2338 2339 while (!list_empty(&tmp_list)) { 2340 if (!msg) { 2341 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, 2342 PAGE_SIZE, GFP_NOFS, false); 2343 if (!msg) 2344 goto out_err; 2345 head = msg->front.iov_base; 2346 head->num = cpu_to_le32(0); 2347 msg->front.iov_len = sizeof(*head); 2348 2349 msg->hdr.version = cpu_to_le16(2); 2350 msg->hdr.compat_version = cpu_to_le16(1); 2351 } 2352 2353 cap = list_first_entry(&tmp_list, struct ceph_cap, 2354 session_caps); 2355 list_del(&cap->session_caps); 2356 num_cap_releases--; 2357 2358 head = msg->front.iov_base; 2359 put_unaligned_le32(get_unaligned_le32(&head->num) + 1, 2360 &head->num); 2361 item = msg->front.iov_base + msg->front.iov_len; 2362 item->ino = cpu_to_le64(cap->cap_ino); 2363 item->cap_id = cpu_to_le64(cap->cap_id); 2364 item->migrate_seq = cpu_to_le32(cap->mseq); 2365 item->seq = cpu_to_le32(cap->issue_seq); 2366 msg->front.iov_len += sizeof(*item); 2367 2368 ceph_put_cap(mdsc, cap); 2369 2370 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { 2371 // Append cap_barrier field 2372 cap_barrier = msg->front.iov_base + msg->front.iov_len; 2373 *cap_barrier = barrier; 2374 msg->front.iov_len += sizeof(*cap_barrier); 2375 2376 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2377 doutc(cl, "mds%d %p\n", session->s_mds, msg); 2378 ceph_con_send(&session->s_con, msg); 2379 msg = NULL; 2380 } 2381 } 2382 2383 BUG_ON(num_cap_releases != 0); 2384 2385 spin_lock(&session->s_cap_lock); 2386 if (!list_empty(&session->s_cap_releases)) 2387 goto again; 2388 spin_unlock(&session->s_cap_lock); 2389 2390 if (msg) { 2391 // Append cap_barrier field 2392 cap_barrier = msg->front.iov_base + msg->front.iov_len; 2393 *cap_barrier = barrier; 2394 msg->front.iov_len += sizeof(*cap_barrier); 2395 2396 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 2397 doutc(cl, "mds%d %p\n", session->s_mds, msg); 2398 ceph_con_send(&session->s_con, msg); 2399 } 2400 return; 2401 out_err: 2402 pr_err_client(cl, "mds%d, failed to allocate message\n", 2403 session->s_mds); 2404 spin_lock(&session->s_cap_lock); 2405 list_splice(&tmp_list, &session->s_cap_releases); 2406 session->s_num_cap_releases += num_cap_releases; 2407 spin_unlock(&session->s_cap_lock); 2408 } 2409 2410 static void ceph_cap_release_work(struct work_struct *work) 2411 { 2412 struct ceph_mds_session *session = 2413 container_of(work, struct ceph_mds_session, s_cap_release_work); 2414 2415 mutex_lock(&session->s_mutex); 2416 if (session->s_state == CEPH_MDS_SESSION_OPEN || 2417 session->s_state == CEPH_MDS_SESSION_HUNG) 2418 ceph_send_cap_releases(session->s_mdsc, session); 2419 mutex_unlock(&session->s_mutex); 2420 ceph_put_mds_session(session); 2421 } 2422 2423 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, 2424 struct ceph_mds_session *session) 2425 { 2426 struct ceph_client *cl = mdsc->fsc->client; 2427 if (mdsc->stopping) 2428 return; 2429 2430 ceph_get_mds_session(session); 2431 if (queue_work(mdsc->fsc->cap_wq, 2432 &session->s_cap_release_work)) { 2433 doutc(cl, "cap release work queued\n"); 2434 } else { 2435 ceph_put_mds_session(session); 2436 doutc(cl, "failed to queue cap release work\n"); 2437 } 2438 } 2439 2440 /* 2441 * caller holds session->s_cap_lock 2442 */ 2443 void __ceph_queue_cap_release(struct ceph_mds_session *session, 2444 struct ceph_cap *cap) 2445 { 2446 list_add_tail(&cap->session_caps, &session->s_cap_releases); 2447 session->s_num_cap_releases++; 2448 2449 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE)) 2450 ceph_flush_cap_releases(session->s_mdsc, session); 2451 } 2452 2453 static void ceph_cap_reclaim_work(struct work_struct *work) 2454 { 2455 struct ceph_mds_client *mdsc = 2456 container_of(work, struct ceph_mds_client, cap_reclaim_work); 2457 int ret = ceph_trim_dentries(mdsc); 2458 if (ret == -EAGAIN) 2459 ceph_queue_cap_reclaim_work(mdsc); 2460 } 2461 2462 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc) 2463 { 2464 struct ceph_client *cl = mdsc->fsc->client; 2465 if (mdsc->stopping) 2466 return; 2467 2468 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) { 2469 doutc(cl, "caps reclaim work queued\n"); 2470 } else { 2471 doutc(cl, "failed to queue caps release work\n"); 2472 } 2473 } 2474 2475 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr) 2476 { 2477 int val; 2478 if (!nr) 2479 return; 2480 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending); 2481 if ((val % CEPH_CAPS_PER_RELEASE) < nr) { 2482 atomic_set(&mdsc->cap_reclaim_pending, 0); 2483 ceph_queue_cap_reclaim_work(mdsc); 2484 } 2485 } 2486 2487 void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc) 2488 { 2489 struct ceph_client *cl = mdsc->fsc->client; 2490 if (mdsc->stopping) 2491 return; 2492 2493 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) { 2494 doutc(cl, "caps unlink work queued\n"); 2495 } else { 2496 doutc(cl, "failed to queue caps unlink work\n"); 2497 } 2498 } 2499 2500 static void ceph_cap_unlink_work(struct work_struct *work) 2501 { 2502 struct ceph_mds_client *mdsc = 2503 container_of(work, struct ceph_mds_client, cap_unlink_work); 2504 struct ceph_client *cl = mdsc->fsc->client; 2505 2506 doutc(cl, "begin\n"); 2507 spin_lock(&mdsc->cap_delay_lock); 2508 while (!list_empty(&mdsc->cap_unlink_delay_list)) { 2509 struct ceph_inode_info *ci; 2510 struct inode *inode; 2511 2512 ci = list_first_entry(&mdsc->cap_unlink_delay_list, 2513 struct ceph_inode_info, 2514 i_cap_delay_list); 2515 list_del_init(&ci->i_cap_delay_list); 2516 2517 inode = igrab(&ci->netfs.inode); 2518 if (inode) { 2519 spin_unlock(&mdsc->cap_delay_lock); 2520 doutc(cl, "on %p %llx.%llx\n", inode, 2521 ceph_vinop(inode)); 2522 ceph_check_caps(ci, CHECK_CAPS_FLUSH); 2523 iput(inode); 2524 spin_lock(&mdsc->cap_delay_lock); 2525 } 2526 } 2527 spin_unlock(&mdsc->cap_delay_lock); 2528 doutc(cl, "done\n"); 2529 } 2530 2531 /* 2532 * requests 2533 */ 2534 2535 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 2536 struct inode *dir) 2537 { 2538 struct ceph_inode_info *ci = ceph_inode(dir); 2539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 2540 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; 2541 size_t size = sizeof(struct ceph_mds_reply_dir_entry); 2542 unsigned int num_entries; 2543 int order; 2544 2545 spin_lock(&ci->i_ceph_lock); 2546 num_entries = ci->i_files + ci->i_subdirs; 2547 spin_unlock(&ci->i_ceph_lock); 2548 num_entries = max(num_entries, 1U); 2549 num_entries = min(num_entries, opt->max_readdir); 2550 2551 order = get_order(size * num_entries); 2552 while (order >= 0) { 2553 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL | 2554 __GFP_NOWARN | 2555 __GFP_ZERO, 2556 order); 2557 if (rinfo->dir_entries) 2558 break; 2559 order--; 2560 } 2561 if (!rinfo->dir_entries) 2562 return -ENOMEM; 2563 2564 num_entries = (PAGE_SIZE << order) / size; 2565 num_entries = min(num_entries, opt->max_readdir); 2566 2567 rinfo->dir_buf_size = PAGE_SIZE << order; 2568 req->r_num_caps = num_entries + 1; 2569 req->r_args.readdir.max_entries = cpu_to_le32(num_entries); 2570 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); 2571 return 0; 2572 } 2573 2574 /* 2575 * Create an mds request. 2576 */ 2577 struct ceph_mds_request * 2578 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) 2579 { 2580 struct ceph_mds_request *req; 2581 2582 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS); 2583 if (!req) 2584 return ERR_PTR(-ENOMEM); 2585 2586 mutex_init(&req->r_fill_mutex); 2587 req->r_mdsc = mdsc; 2588 req->r_started = jiffies; 2589 req->r_start_latency = ktime_get(); 2590 req->r_resend_mds = -1; 2591 INIT_LIST_HEAD(&req->r_unsafe_dir_item); 2592 INIT_LIST_HEAD(&req->r_unsafe_target_item); 2593 req->r_fmode = -1; 2594 req->r_feature_needed = -1; 2595 kref_init(&req->r_kref); 2596 RB_CLEAR_NODE(&req->r_node); 2597 INIT_LIST_HEAD(&req->r_wait); 2598 init_completion(&req->r_completion); 2599 init_completion(&req->r_safe_completion); 2600 INIT_LIST_HEAD(&req->r_unsafe_item); 2601 2602 ktime_get_coarse_real_ts64(&req->r_stamp); 2603 2604 req->r_op = op; 2605 req->r_direct_mode = mode; 2606 return req; 2607 } 2608 2609 /* 2610 * return oldest (lowest) request, tid in request tree, 0 if none. 2611 * 2612 * called under mdsc->mutex. 2613 */ 2614 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) 2615 { 2616 if (RB_EMPTY_ROOT(&mdsc->request_tree)) 2617 return NULL; 2618 return rb_entry(rb_first(&mdsc->request_tree), 2619 struct ceph_mds_request, r_node); 2620 } 2621 2622 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) 2623 { 2624 return mdsc->oldest_tid; 2625 } 2626 2627 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 2628 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen) 2629 { 2630 struct inode *dir = req->r_parent; 2631 struct dentry *dentry = req->r_dentry; 2632 u8 *cryptbuf = NULL; 2633 u32 len = 0; 2634 int ret = 0; 2635 2636 /* only encode if we have parent and dentry */ 2637 if (!dir || !dentry) 2638 goto success; 2639 2640 /* No-op unless this is encrypted */ 2641 if (!IS_ENCRYPTED(dir)) 2642 goto success; 2643 2644 ret = ceph_fscrypt_prepare_readdir(dir); 2645 if (ret < 0) 2646 return ERR_PTR(ret); 2647 2648 /* No key? Just ignore it. */ 2649 if (!fscrypt_has_encryption_key(dir)) 2650 goto success; 2651 2652 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX, 2653 &len)) { 2654 WARN_ON_ONCE(1); 2655 return ERR_PTR(-ENAMETOOLONG); 2656 } 2657 2658 /* No need to append altname if name is short enough */ 2659 if (len <= CEPH_NOHASH_NAME_MAX) { 2660 len = 0; 2661 goto success; 2662 } 2663 2664 cryptbuf = kmalloc(len, GFP_KERNEL); 2665 if (!cryptbuf) 2666 return ERR_PTR(-ENOMEM); 2667 2668 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len); 2669 if (ret) { 2670 kfree(cryptbuf); 2671 return ERR_PTR(ret); 2672 } 2673 success: 2674 *plen = len; 2675 return cryptbuf; 2676 } 2677 #else 2678 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen) 2679 { 2680 *plen = 0; 2681 return NULL; 2682 } 2683 #endif 2684 2685 /** 2686 * ceph_mdsc_build_path - build a path string to a given dentry 2687 * @mdsc: mds client 2688 * @dentry: dentry to which path should be built 2689 * @plen: returned length of string 2690 * @pbase: returned base inode number 2691 * @for_wire: is this path going to be sent to the MDS? 2692 * 2693 * Build a string that represents the path to the dentry. This is mostly called 2694 * for two different purposes: 2695 * 2696 * 1) we need to build a path string to send to the MDS (for_wire == true) 2697 * 2) we need a path string for local presentation (e.g. debugfs) 2698 * (for_wire == false) 2699 * 2700 * The path is built in reverse, starting with the dentry. Walk back up toward 2701 * the root, building the path until the first non-snapped inode is reached 2702 * (for_wire) or the root inode is reached (!for_wire). 2703 * 2704 * Encode hidden .snap dirs as a double /, i.e. 2705 * foo/.snap/bar -> foo//bar 2706 */ 2707 char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry, 2708 int *plen, u64 *pbase, int for_wire) 2709 { 2710 struct ceph_client *cl = mdsc->fsc->client; 2711 struct dentry *cur; 2712 struct inode *inode; 2713 char *path; 2714 int pos; 2715 unsigned seq; 2716 u64 base; 2717 2718 if (!dentry) 2719 return ERR_PTR(-EINVAL); 2720 2721 path = __getname(); 2722 if (!path) 2723 return ERR_PTR(-ENOMEM); 2724 retry: 2725 pos = PATH_MAX - 1; 2726 path[pos] = '\0'; 2727 2728 seq = read_seqbegin(&rename_lock); 2729 cur = dget(dentry); 2730 for (;;) { 2731 struct dentry *parent; 2732 2733 spin_lock(&cur->d_lock); 2734 inode = d_inode(cur); 2735 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { 2736 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur); 2737 spin_unlock(&cur->d_lock); 2738 parent = dget_parent(cur); 2739 } else if (for_wire && inode && dentry != cur && 2740 ceph_snap(inode) == CEPH_NOSNAP) { 2741 spin_unlock(&cur->d_lock); 2742 pos++; /* get rid of any prepended '/' */ 2743 break; 2744 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) { 2745 pos -= cur->d_name.len; 2746 if (pos < 0) { 2747 spin_unlock(&cur->d_lock); 2748 break; 2749 } 2750 memcpy(path + pos, cur->d_name.name, cur->d_name.len); 2751 spin_unlock(&cur->d_lock); 2752 parent = dget_parent(cur); 2753 } else { 2754 int len, ret; 2755 char buf[NAME_MAX]; 2756 2757 /* 2758 * Proactively copy name into buf, in case we need to 2759 * present it as-is. 2760 */ 2761 memcpy(buf, cur->d_name.name, cur->d_name.len); 2762 len = cur->d_name.len; 2763 spin_unlock(&cur->d_lock); 2764 parent = dget_parent(cur); 2765 2766 ret = ceph_fscrypt_prepare_readdir(d_inode(parent)); 2767 if (ret < 0) { 2768 dput(parent); 2769 dput(cur); 2770 return ERR_PTR(ret); 2771 } 2772 2773 if (fscrypt_has_encryption_key(d_inode(parent))) { 2774 len = ceph_encode_encrypted_fname(d_inode(parent), 2775 cur, buf); 2776 if (len < 0) { 2777 dput(parent); 2778 dput(cur); 2779 return ERR_PTR(len); 2780 } 2781 } 2782 pos -= len; 2783 if (pos < 0) { 2784 dput(parent); 2785 break; 2786 } 2787 memcpy(path + pos, buf, len); 2788 } 2789 dput(cur); 2790 cur = parent; 2791 2792 /* Are we at the root? */ 2793 if (IS_ROOT(cur)) 2794 break; 2795 2796 /* Are we out of buffer? */ 2797 if (--pos < 0) 2798 break; 2799 2800 path[pos] = '/'; 2801 } 2802 inode = d_inode(cur); 2803 base = inode ? ceph_ino(inode) : 0; 2804 dput(cur); 2805 2806 if (read_seqretry(&rename_lock, seq)) 2807 goto retry; 2808 2809 if (pos < 0) { 2810 /* 2811 * A rename didn't occur, but somehow we didn't end up where 2812 * we thought we would. Throw a warning and try again. 2813 */ 2814 pr_warn_client(cl, "did not end path lookup where expected (pos = %d)\n", 2815 pos); 2816 goto retry; 2817 } 2818 2819 *pbase = base; 2820 *plen = PATH_MAX - 1 - pos; 2821 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry), 2822 base, *plen, path + pos); 2823 return path + pos; 2824 } 2825 2826 static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry, 2827 struct inode *dir, const char **ppath, int *ppathlen, 2828 u64 *pino, bool *pfreepath, bool parent_locked) 2829 { 2830 char *path; 2831 2832 rcu_read_lock(); 2833 if (!dir) 2834 dir = d_inode_rcu(dentry->d_parent); 2835 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP && 2836 !IS_ENCRYPTED(dir)) { 2837 *pino = ceph_ino(dir); 2838 rcu_read_unlock(); 2839 *ppath = dentry->d_name.name; 2840 *ppathlen = dentry->d_name.len; 2841 return 0; 2842 } 2843 rcu_read_unlock(); 2844 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1); 2845 if (IS_ERR(path)) 2846 return PTR_ERR(path); 2847 *ppath = path; 2848 *pfreepath = true; 2849 return 0; 2850 } 2851 2852 static int build_inode_path(struct inode *inode, 2853 const char **ppath, int *ppathlen, u64 *pino, 2854 bool *pfreepath) 2855 { 2856 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 2857 struct dentry *dentry; 2858 char *path; 2859 2860 if (ceph_snap(inode) == CEPH_NOSNAP) { 2861 *pino = ceph_ino(inode); 2862 *ppathlen = 0; 2863 return 0; 2864 } 2865 dentry = d_find_alias(inode); 2866 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1); 2867 dput(dentry); 2868 if (IS_ERR(path)) 2869 return PTR_ERR(path); 2870 *ppath = path; 2871 *pfreepath = true; 2872 return 0; 2873 } 2874 2875 /* 2876 * request arguments may be specified via an inode *, a dentry *, or 2877 * an explicit ino+path. 2878 */ 2879 static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode, 2880 struct dentry *rdentry, struct inode *rdiri, 2881 const char *rpath, u64 rino, const char **ppath, 2882 int *pathlen, u64 *ino, bool *freepath, 2883 bool parent_locked) 2884 { 2885 struct ceph_client *cl = mdsc->fsc->client; 2886 int r = 0; 2887 2888 if (rinode) { 2889 r = build_inode_path(rinode, ppath, pathlen, ino, freepath); 2890 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode), 2891 ceph_snap(rinode)); 2892 } else if (rdentry) { 2893 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino, 2894 freepath, parent_locked); 2895 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath); 2896 } else if (rpath || rino) { 2897 *ino = rino; 2898 *ppath = rpath; 2899 *pathlen = rpath ? strlen(rpath) : 0; 2900 doutc(cl, " path %.*s\n", *pathlen, rpath); 2901 } 2902 2903 return r; 2904 } 2905 2906 static void encode_mclientrequest_tail(void **p, 2907 const struct ceph_mds_request *req) 2908 { 2909 struct ceph_timespec ts; 2910 int i; 2911 2912 ceph_encode_timespec64(&ts, &req->r_stamp); 2913 ceph_encode_copy(p, &ts, sizeof(ts)); 2914 2915 /* v4: gid_list */ 2916 ceph_encode_32(p, req->r_cred->group_info->ngroups); 2917 for (i = 0; i < req->r_cred->group_info->ngroups; i++) 2918 ceph_encode_64(p, from_kgid(&init_user_ns, 2919 req->r_cred->group_info->gid[i])); 2920 2921 /* v5: altname */ 2922 ceph_encode_32(p, req->r_altname_len); 2923 ceph_encode_copy(p, req->r_altname, req->r_altname_len); 2924 2925 /* v6: fscrypt_auth and fscrypt_file */ 2926 if (req->r_fscrypt_auth) { 2927 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth); 2928 2929 ceph_encode_32(p, authlen); 2930 ceph_encode_copy(p, req->r_fscrypt_auth, authlen); 2931 } else { 2932 ceph_encode_32(p, 0); 2933 } 2934 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) { 2935 ceph_encode_32(p, sizeof(__le64)); 2936 ceph_encode_64(p, req->r_fscrypt_file); 2937 } else { 2938 ceph_encode_32(p, 0); 2939 } 2940 } 2941 2942 static inline u16 mds_supported_head_version(struct ceph_mds_session *session) 2943 { 2944 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features)) 2945 return 1; 2946 2947 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) 2948 return 2; 2949 2950 return CEPH_MDS_REQUEST_HEAD_VERSION; 2951 } 2952 2953 static struct ceph_mds_request_head_legacy * 2954 find_legacy_request_head(void *p, u64 features) 2955 { 2956 bool legacy = !(features & CEPH_FEATURE_FS_BTIME); 2957 struct ceph_mds_request_head_old *ohead; 2958 2959 if (legacy) 2960 return (struct ceph_mds_request_head_legacy *)p; 2961 ohead = (struct ceph_mds_request_head_old *)p; 2962 return (struct ceph_mds_request_head_legacy *)&ohead->oldest_client_tid; 2963 } 2964 2965 /* 2966 * called under mdsc->mutex 2967 */ 2968 static struct ceph_msg *create_request_message(struct ceph_mds_session *session, 2969 struct ceph_mds_request *req, 2970 bool drop_cap_releases) 2971 { 2972 int mds = session->s_mds; 2973 struct ceph_mds_client *mdsc = session->s_mdsc; 2974 struct ceph_client *cl = mdsc->fsc->client; 2975 struct ceph_msg *msg; 2976 struct ceph_mds_request_head_legacy *lhead; 2977 const char *path1 = NULL; 2978 const char *path2 = NULL; 2979 u64 ino1 = 0, ino2 = 0; 2980 int pathlen1 = 0, pathlen2 = 0; 2981 bool freepath1 = false, freepath2 = false; 2982 struct dentry *old_dentry = NULL; 2983 int len; 2984 u16 releases; 2985 void *p, *end; 2986 int ret; 2987 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME); 2988 u16 request_head_version = mds_supported_head_version(session); 2989 kuid_t caller_fsuid = req->r_cred->fsuid; 2990 kgid_t caller_fsgid = req->r_cred->fsgid; 2991 2992 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry, 2993 req->r_parent, req->r_path1, req->r_ino1.ino, 2994 &path1, &pathlen1, &ino1, &freepath1, 2995 test_bit(CEPH_MDS_R_PARENT_LOCKED, 2996 &req->r_req_flags)); 2997 if (ret < 0) { 2998 msg = ERR_PTR(ret); 2999 goto out; 3000 } 3001 3002 /* If r_old_dentry is set, then assume that its parent is locked */ 3003 if (req->r_old_dentry && 3004 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED)) 3005 old_dentry = req->r_old_dentry; 3006 ret = set_request_path_attr(mdsc, NULL, old_dentry, 3007 req->r_old_dentry_dir, 3008 req->r_path2, req->r_ino2.ino, 3009 &path2, &pathlen2, &ino2, &freepath2, true); 3010 if (ret < 0) { 3011 msg = ERR_PTR(ret); 3012 goto out_free1; 3013 } 3014 3015 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len); 3016 if (IS_ERR(req->r_altname)) { 3017 msg = ERR_CAST(req->r_altname); 3018 req->r_altname = NULL; 3019 goto out_free2; 3020 } 3021 3022 /* 3023 * For old cephs without supporting the 32bit retry/fwd feature 3024 * it will copy the raw memories directly when decoding the 3025 * requests. While new cephs will decode the head depending the 3026 * version member, so we need to make sure it will be compatible 3027 * with them both. 3028 */ 3029 if (legacy) 3030 len = sizeof(struct ceph_mds_request_head_legacy); 3031 else if (request_head_version == 1) 3032 len = sizeof(struct ceph_mds_request_head_old); 3033 else if (request_head_version == 2) 3034 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd); 3035 else 3036 len = sizeof(struct ceph_mds_request_head); 3037 3038 /* filepaths */ 3039 len += 2 * (1 + sizeof(u32) + sizeof(u64)); 3040 len += pathlen1 + pathlen2; 3041 3042 /* cap releases */ 3043 len += sizeof(struct ceph_mds_request_release) * 3044 (!!req->r_inode_drop + !!req->r_dentry_drop + 3045 !!req->r_old_inode_drop + !!req->r_old_dentry_drop); 3046 3047 if (req->r_dentry_drop) 3048 len += pathlen1; 3049 if (req->r_old_dentry_drop) 3050 len += pathlen2; 3051 3052 /* MClientRequest tail */ 3053 3054 /* req->r_stamp */ 3055 len += sizeof(struct ceph_timespec); 3056 3057 /* gid list */ 3058 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups); 3059 3060 /* alternate name */ 3061 len += sizeof(u32) + req->r_altname_len; 3062 3063 /* fscrypt_auth */ 3064 len += sizeof(u32); // fscrypt_auth 3065 if (req->r_fscrypt_auth) 3066 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth); 3067 3068 /* fscrypt_file */ 3069 len += sizeof(u32); 3070 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) 3071 len += sizeof(__le64); 3072 3073 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false); 3074 if (!msg) { 3075 msg = ERR_PTR(-ENOMEM); 3076 goto out_free2; 3077 } 3078 3079 msg->hdr.tid = cpu_to_le64(req->r_tid); 3080 3081 lhead = find_legacy_request_head(msg->front.iov_base, 3082 session->s_con.peer_features); 3083 3084 if ((req->r_mnt_idmap != &nop_mnt_idmap) && 3085 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) { 3086 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op)); 3087 3088 if (enable_unsafe_idmap) { 3089 pr_warn_once_client(cl, 3090 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID" 3091 " is not supported by MDS. UID/GID-based restrictions may" 3092 " not work properly.\n"); 3093 3094 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns, 3095 VFSUIDT_INIT(req->r_cred->fsuid)); 3096 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns, 3097 VFSGIDT_INIT(req->r_cred->fsgid)); 3098 } else { 3099 pr_err_ratelimited_client(cl, 3100 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID" 3101 " is not supported by MDS. Fail request with -EIO.\n"); 3102 3103 ret = -EIO; 3104 goto out_err; 3105 } 3106 } 3107 3108 /* 3109 * The ceph_mds_request_head_legacy didn't contain a version field, and 3110 * one was added when we moved the message version from 3->4. 3111 */ 3112 if (legacy) { 3113 msg->hdr.version = cpu_to_le16(3); 3114 p = msg->front.iov_base + sizeof(*lhead); 3115 } else if (request_head_version == 1) { 3116 struct ceph_mds_request_head_old *ohead = msg->front.iov_base; 3117 3118 msg->hdr.version = cpu_to_le16(4); 3119 ohead->version = cpu_to_le16(1); 3120 p = msg->front.iov_base + sizeof(*ohead); 3121 } else if (request_head_version == 2) { 3122 struct ceph_mds_request_head *nhead = msg->front.iov_base; 3123 3124 msg->hdr.version = cpu_to_le16(6); 3125 nhead->version = cpu_to_le16(2); 3126 3127 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd); 3128 } else { 3129 struct ceph_mds_request_head *nhead = msg->front.iov_base; 3130 kuid_t owner_fsuid; 3131 kgid_t owner_fsgid; 3132 3133 msg->hdr.version = cpu_to_le16(6); 3134 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION); 3135 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head)); 3136 3137 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) { 3138 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns, 3139 VFSUIDT_INIT(req->r_cred->fsuid)); 3140 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns, 3141 VFSGIDT_INIT(req->r_cred->fsgid)); 3142 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid)); 3143 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid)); 3144 } else { 3145 nhead->owner_uid = cpu_to_le32(-1); 3146 nhead->owner_gid = cpu_to_le32(-1); 3147 } 3148 3149 p = msg->front.iov_base + sizeof(*nhead); 3150 } 3151 3152 end = msg->front.iov_base + msg->front.iov_len; 3153 3154 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); 3155 lhead->op = cpu_to_le32(req->r_op); 3156 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, 3157 caller_fsuid)); 3158 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, 3159 caller_fsgid)); 3160 lhead->ino = cpu_to_le64(req->r_deleg_ino); 3161 lhead->args = req->r_args; 3162 3163 ceph_encode_filepath(&p, end, ino1, path1); 3164 ceph_encode_filepath(&p, end, ino2, path2); 3165 3166 /* make note of release offset, in case we need to replay */ 3167 req->r_request_release_offset = p - msg->front.iov_base; 3168 3169 /* cap releases */ 3170 releases = 0; 3171 if (req->r_inode_drop) 3172 releases += ceph_encode_inode_release(&p, 3173 req->r_inode ? req->r_inode : d_inode(req->r_dentry), 3174 mds, req->r_inode_drop, req->r_inode_unless, 3175 req->r_op == CEPH_MDS_OP_READDIR); 3176 if (req->r_dentry_drop) { 3177 ret = ceph_encode_dentry_release(&p, req->r_dentry, 3178 req->r_parent, mds, req->r_dentry_drop, 3179 req->r_dentry_unless); 3180 if (ret < 0) 3181 goto out_err; 3182 releases += ret; 3183 } 3184 if (req->r_old_dentry_drop) { 3185 ret = ceph_encode_dentry_release(&p, req->r_old_dentry, 3186 req->r_old_dentry_dir, mds, 3187 req->r_old_dentry_drop, 3188 req->r_old_dentry_unless); 3189 if (ret < 0) 3190 goto out_err; 3191 releases += ret; 3192 } 3193 if (req->r_old_inode_drop) 3194 releases += ceph_encode_inode_release(&p, 3195 d_inode(req->r_old_dentry), 3196 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); 3197 3198 if (drop_cap_releases) { 3199 releases = 0; 3200 p = msg->front.iov_base + req->r_request_release_offset; 3201 } 3202 3203 lhead->num_releases = cpu_to_le16(releases); 3204 3205 encode_mclientrequest_tail(&p, req); 3206 3207 if (WARN_ON_ONCE(p > end)) { 3208 ceph_msg_put(msg); 3209 msg = ERR_PTR(-ERANGE); 3210 goto out_free2; 3211 } 3212 3213 msg->front.iov_len = p - msg->front.iov_base; 3214 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 3215 3216 if (req->r_pagelist) { 3217 struct ceph_pagelist *pagelist = req->r_pagelist; 3218 ceph_msg_data_add_pagelist(msg, pagelist); 3219 msg->hdr.data_len = cpu_to_le32(pagelist->length); 3220 } else { 3221 msg->hdr.data_len = 0; 3222 } 3223 3224 msg->hdr.data_off = cpu_to_le16(0); 3225 3226 out_free2: 3227 if (freepath2) 3228 ceph_mdsc_free_path((char *)path2, pathlen2); 3229 out_free1: 3230 if (freepath1) 3231 ceph_mdsc_free_path((char *)path1, pathlen1); 3232 out: 3233 return msg; 3234 out_err: 3235 ceph_msg_put(msg); 3236 msg = ERR_PTR(ret); 3237 goto out_free2; 3238 } 3239 3240 /* 3241 * called under mdsc->mutex if error, under no mutex if 3242 * success. 3243 */ 3244 static void complete_request(struct ceph_mds_client *mdsc, 3245 struct ceph_mds_request *req) 3246 { 3247 req->r_end_latency = ktime_get(); 3248 3249 if (req->r_callback) 3250 req->r_callback(mdsc, req); 3251 complete_all(&req->r_completion); 3252 } 3253 3254 /* 3255 * called under mdsc->mutex 3256 */ 3257 static int __prepare_send_request(struct ceph_mds_session *session, 3258 struct ceph_mds_request *req, 3259 bool drop_cap_releases) 3260 { 3261 int mds = session->s_mds; 3262 struct ceph_mds_client *mdsc = session->s_mdsc; 3263 struct ceph_client *cl = mdsc->fsc->client; 3264 struct ceph_mds_request_head_legacy *lhead; 3265 struct ceph_mds_request_head *nhead; 3266 struct ceph_msg *msg; 3267 int flags = 0, old_max_retry; 3268 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, 3269 &session->s_features); 3270 3271 /* 3272 * Avoid inifinite retrying after overflow. The client will 3273 * increase the retry count and if the MDS is old version, 3274 * so we limit to retry at most 256 times. 3275 */ 3276 if (req->r_attempts) { 3277 old_max_retry = sizeof_field(struct ceph_mds_request_head_old, 3278 num_retry); 3279 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE); 3280 if ((old_version && req->r_attempts >= old_max_retry) || 3281 ((uint32_t)req->r_attempts >= U32_MAX)) { 3282 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n", 3283 req->r_tid); 3284 return -EMULTIHOP; 3285 } 3286 } 3287 3288 req->r_attempts++; 3289 if (req->r_inode) { 3290 struct ceph_cap *cap = 3291 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); 3292 3293 if (cap) 3294 req->r_sent_on_mseq = cap->mseq; 3295 else 3296 req->r_sent_on_mseq = -1; 3297 } 3298 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid, 3299 ceph_mds_op_name(req->r_op), req->r_attempts); 3300 3301 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 3302 void *p; 3303 3304 /* 3305 * Replay. Do not regenerate message (and rebuild 3306 * paths, etc.); just use the original message. 3307 * Rebuilding paths will break for renames because 3308 * d_move mangles the src name. 3309 */ 3310 msg = req->r_request; 3311 lhead = find_legacy_request_head(msg->front.iov_base, 3312 session->s_con.peer_features); 3313 3314 flags = le32_to_cpu(lhead->flags); 3315 flags |= CEPH_MDS_FLAG_REPLAY; 3316 lhead->flags = cpu_to_le32(flags); 3317 3318 if (req->r_target_inode) 3319 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); 3320 3321 lhead->num_retry = req->r_attempts - 1; 3322 if (!old_version) { 3323 nhead = (struct ceph_mds_request_head*)msg->front.iov_base; 3324 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1); 3325 } 3326 3327 /* remove cap/dentry releases from message */ 3328 lhead->num_releases = 0; 3329 3330 p = msg->front.iov_base + req->r_request_release_offset; 3331 encode_mclientrequest_tail(&p, req); 3332 3333 msg->front.iov_len = p - msg->front.iov_base; 3334 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 3335 return 0; 3336 } 3337 3338 if (req->r_request) { 3339 ceph_msg_put(req->r_request); 3340 req->r_request = NULL; 3341 } 3342 msg = create_request_message(session, req, drop_cap_releases); 3343 if (IS_ERR(msg)) { 3344 req->r_err = PTR_ERR(msg); 3345 return PTR_ERR(msg); 3346 } 3347 req->r_request = msg; 3348 3349 lhead = find_legacy_request_head(msg->front.iov_base, 3350 session->s_con.peer_features); 3351 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); 3352 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 3353 flags |= CEPH_MDS_FLAG_REPLAY; 3354 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) 3355 flags |= CEPH_MDS_FLAG_ASYNC; 3356 if (req->r_parent) 3357 flags |= CEPH_MDS_FLAG_WANT_DENTRY; 3358 lhead->flags = cpu_to_le32(flags); 3359 lhead->num_fwd = req->r_num_fwd; 3360 lhead->num_retry = req->r_attempts - 1; 3361 if (!old_version) { 3362 nhead = (struct ceph_mds_request_head*)msg->front.iov_base; 3363 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd); 3364 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1); 3365 } 3366 3367 doutc(cl, " r_parent = %p\n", req->r_parent); 3368 return 0; 3369 } 3370 3371 /* 3372 * called under mdsc->mutex 3373 */ 3374 static int __send_request(struct ceph_mds_session *session, 3375 struct ceph_mds_request *req, 3376 bool drop_cap_releases) 3377 { 3378 int err; 3379 3380 err = __prepare_send_request(session, req, drop_cap_releases); 3381 if (!err) { 3382 ceph_msg_get(req->r_request); 3383 ceph_con_send(&session->s_con, req->r_request); 3384 } 3385 3386 return err; 3387 } 3388 3389 /* 3390 * send request, or put it on the appropriate wait list. 3391 */ 3392 static void __do_request(struct ceph_mds_client *mdsc, 3393 struct ceph_mds_request *req) 3394 { 3395 struct ceph_client *cl = mdsc->fsc->client; 3396 struct ceph_mds_session *session = NULL; 3397 int mds = -1; 3398 int err = 0; 3399 bool random; 3400 3401 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { 3402 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) 3403 __unregister_request(mdsc, req); 3404 return; 3405 } 3406 3407 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) { 3408 doutc(cl, "metadata corrupted\n"); 3409 err = -EIO; 3410 goto finish; 3411 } 3412 if (req->r_timeout && 3413 time_after_eq(jiffies, req->r_started + req->r_timeout)) { 3414 doutc(cl, "timed out\n"); 3415 err = -ETIMEDOUT; 3416 goto finish; 3417 } 3418 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 3419 doutc(cl, "forced umount\n"); 3420 err = -EIO; 3421 goto finish; 3422 } 3423 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) { 3424 if (mdsc->mdsmap_err) { 3425 err = mdsc->mdsmap_err; 3426 doutc(cl, "mdsmap err %d\n", err); 3427 goto finish; 3428 } 3429 if (mdsc->mdsmap->m_epoch == 0) { 3430 doutc(cl, "no mdsmap, waiting for map\n"); 3431 list_add(&req->r_wait, &mdsc->waiting_for_map); 3432 return; 3433 } 3434 if (!(mdsc->fsc->mount_options->flags & 3435 CEPH_MOUNT_OPT_MOUNTWAIT) && 3436 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) { 3437 err = -EHOSTUNREACH; 3438 goto finish; 3439 } 3440 } 3441 3442 put_request_session(req); 3443 3444 mds = __choose_mds(mdsc, req, &random); 3445 if (mds < 0 || 3446 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { 3447 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { 3448 err = -EJUKEBOX; 3449 goto finish; 3450 } 3451 doutc(cl, "no mds or not active, waiting for map\n"); 3452 list_add(&req->r_wait, &mdsc->waiting_for_map); 3453 return; 3454 } 3455 3456 /* get, open session */ 3457 session = __ceph_lookup_mds_session(mdsc, mds); 3458 if (!session) { 3459 session = register_session(mdsc, mds); 3460 if (IS_ERR(session)) { 3461 err = PTR_ERR(session); 3462 goto finish; 3463 } 3464 } 3465 req->r_session = ceph_get_mds_session(session); 3466 3467 doutc(cl, "mds%d session %p state %s\n", mds, session, 3468 ceph_session_state_name(session->s_state)); 3469 3470 /* 3471 * The old ceph will crash the MDSs when see unknown OPs 3472 */ 3473 if (req->r_feature_needed > 0 && 3474 !test_bit(req->r_feature_needed, &session->s_features)) { 3475 err = -EOPNOTSUPP; 3476 goto out_session; 3477 } 3478 3479 if (session->s_state != CEPH_MDS_SESSION_OPEN && 3480 session->s_state != CEPH_MDS_SESSION_HUNG) { 3481 /* 3482 * We cannot queue async requests since the caps and delegated 3483 * inodes are bound to the session. Just return -EJUKEBOX and 3484 * let the caller retry a sync request in that case. 3485 */ 3486 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { 3487 err = -EJUKEBOX; 3488 goto out_session; 3489 } 3490 3491 /* 3492 * If the session has been REJECTED, then return a hard error, 3493 * unless it's a CLEANRECOVER mount, in which case we'll queue 3494 * it to the mdsc queue. 3495 */ 3496 if (session->s_state == CEPH_MDS_SESSION_REJECTED) { 3497 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER)) 3498 list_add(&req->r_wait, &mdsc->waiting_for_map); 3499 else 3500 err = -EACCES; 3501 goto out_session; 3502 } 3503 3504 if (session->s_state == CEPH_MDS_SESSION_NEW || 3505 session->s_state == CEPH_MDS_SESSION_CLOSING) { 3506 err = __open_session(mdsc, session); 3507 if (err) 3508 goto out_session; 3509 /* retry the same mds later */ 3510 if (random) 3511 req->r_resend_mds = mds; 3512 } 3513 list_add(&req->r_wait, &session->s_waiting); 3514 goto out_session; 3515 } 3516 3517 /* send request */ 3518 req->r_resend_mds = -1; /* forget any previous mds hint */ 3519 3520 if (req->r_request_started == 0) /* note request start time */ 3521 req->r_request_started = jiffies; 3522 3523 /* 3524 * For async create we will choose the auth MDS of frag in parent 3525 * directory to send the request and ususally this works fine, but 3526 * if the migrated the dirtory to another MDS before it could handle 3527 * it the request will be forwarded. 3528 * 3529 * And then the auth cap will be changed. 3530 */ 3531 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) { 3532 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry); 3533 struct ceph_inode_info *ci; 3534 struct ceph_cap *cap; 3535 3536 /* 3537 * The request maybe handled very fast and the new inode 3538 * hasn't been linked to the dentry yet. We need to wait 3539 * for the ceph_finish_async_create(), which shouldn't be 3540 * stuck too long or fail in thoery, to finish when forwarding 3541 * the request. 3542 */ 3543 if (!d_inode(req->r_dentry)) { 3544 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT, 3545 TASK_KILLABLE); 3546 if (err) { 3547 mutex_lock(&req->r_fill_mutex); 3548 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); 3549 mutex_unlock(&req->r_fill_mutex); 3550 goto out_session; 3551 } 3552 } 3553 3554 ci = ceph_inode(d_inode(req->r_dentry)); 3555 3556 spin_lock(&ci->i_ceph_lock); 3557 cap = ci->i_auth_cap; 3558 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) { 3559 doutc(cl, "session changed for auth cap %d -> %d\n", 3560 cap->session->s_mds, session->s_mds); 3561 3562 /* Remove the auth cap from old session */ 3563 spin_lock(&cap->session->s_cap_lock); 3564 cap->session->s_nr_caps--; 3565 list_del_init(&cap->session_caps); 3566 spin_unlock(&cap->session->s_cap_lock); 3567 3568 /* Add the auth cap to the new session */ 3569 cap->mds = mds; 3570 cap->session = session; 3571 spin_lock(&session->s_cap_lock); 3572 session->s_nr_caps++; 3573 list_add_tail(&cap->session_caps, &session->s_caps); 3574 spin_unlock(&session->s_cap_lock); 3575 3576 change_auth_cap_ses(ci, session); 3577 } 3578 spin_unlock(&ci->i_ceph_lock); 3579 } 3580 3581 err = __send_request(session, req, false); 3582 3583 out_session: 3584 ceph_put_mds_session(session); 3585 finish: 3586 if (err) { 3587 doutc(cl, "early error %d\n", err); 3588 req->r_err = err; 3589 complete_request(mdsc, req); 3590 __unregister_request(mdsc, req); 3591 } 3592 return; 3593 } 3594 3595 /* 3596 * called under mdsc->mutex 3597 */ 3598 static void __wake_requests(struct ceph_mds_client *mdsc, 3599 struct list_head *head) 3600 { 3601 struct ceph_client *cl = mdsc->fsc->client; 3602 struct ceph_mds_request *req; 3603 LIST_HEAD(tmp_list); 3604 3605 list_splice_init(head, &tmp_list); 3606 3607 while (!list_empty(&tmp_list)) { 3608 req = list_entry(tmp_list.next, 3609 struct ceph_mds_request, r_wait); 3610 list_del_init(&req->r_wait); 3611 doutc(cl, " wake request %p tid %llu\n", req, 3612 req->r_tid); 3613 __do_request(mdsc, req); 3614 } 3615 } 3616 3617 /* 3618 * Wake up threads with requests pending for @mds, so that they can 3619 * resubmit their requests to a possibly different mds. 3620 */ 3621 static void kick_requests(struct ceph_mds_client *mdsc, int mds) 3622 { 3623 struct ceph_client *cl = mdsc->fsc->client; 3624 struct ceph_mds_request *req; 3625 struct rb_node *p = rb_first(&mdsc->request_tree); 3626 3627 doutc(cl, "kick_requests mds%d\n", mds); 3628 while (p) { 3629 req = rb_entry(p, struct ceph_mds_request, r_node); 3630 p = rb_next(p); 3631 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 3632 continue; 3633 if (req->r_attempts > 0) 3634 continue; /* only new requests */ 3635 if (req->r_session && 3636 req->r_session->s_mds == mds) { 3637 doutc(cl, " kicking tid %llu\n", req->r_tid); 3638 list_del_init(&req->r_wait); 3639 __do_request(mdsc, req); 3640 } 3641 } 3642 } 3643 3644 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir, 3645 struct ceph_mds_request *req) 3646 { 3647 struct ceph_client *cl = mdsc->fsc->client; 3648 int err = 0; 3649 3650 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */ 3651 if (req->r_inode) 3652 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); 3653 if (req->r_parent) { 3654 struct ceph_inode_info *ci = ceph_inode(req->r_parent); 3655 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ? 3656 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD; 3657 spin_lock(&ci->i_ceph_lock); 3658 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false); 3659 __ceph_touch_fmode(ci, mdsc, fmode); 3660 spin_unlock(&ci->i_ceph_lock); 3661 } 3662 if (req->r_old_dentry_dir) 3663 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), 3664 CEPH_CAP_PIN); 3665 3666 if (req->r_inode) { 3667 err = ceph_wait_on_async_create(req->r_inode); 3668 if (err) { 3669 doutc(cl, "wait for async create returned: %d\n", err); 3670 return err; 3671 } 3672 } 3673 3674 if (!err && req->r_old_inode) { 3675 err = ceph_wait_on_async_create(req->r_old_inode); 3676 if (err) { 3677 doutc(cl, "wait for async create returned: %d\n", err); 3678 return err; 3679 } 3680 } 3681 3682 doutc(cl, "submit_request on %p for inode %p\n", req, dir); 3683 mutex_lock(&mdsc->mutex); 3684 __register_request(mdsc, req, dir); 3685 __do_request(mdsc, req); 3686 err = req->r_err; 3687 mutex_unlock(&mdsc->mutex); 3688 return err; 3689 } 3690 3691 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 3692 struct ceph_mds_request *req, 3693 ceph_mds_request_wait_callback_t wait_func) 3694 { 3695 struct ceph_client *cl = mdsc->fsc->client; 3696 int err; 3697 3698 /* wait */ 3699 doutc(cl, "do_request waiting\n"); 3700 if (wait_func) { 3701 err = wait_func(mdsc, req); 3702 } else { 3703 long timeleft = wait_for_completion_killable_timeout( 3704 &req->r_completion, 3705 ceph_timeout_jiffies(req->r_timeout)); 3706 if (timeleft > 0) 3707 err = 0; 3708 else if (!timeleft) 3709 err = -ETIMEDOUT; /* timed out */ 3710 else 3711 err = timeleft; /* killed */ 3712 } 3713 doutc(cl, "do_request waited, got %d\n", err); 3714 mutex_lock(&mdsc->mutex); 3715 3716 /* only abort if we didn't race with a real reply */ 3717 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { 3718 err = le32_to_cpu(req->r_reply_info.head->result); 3719 } else if (err < 0) { 3720 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err); 3721 3722 /* 3723 * ensure we aren't running concurrently with 3724 * ceph_fill_trace or ceph_readdir_prepopulate, which 3725 * rely on locks (dir mutex) held by our caller. 3726 */ 3727 mutex_lock(&req->r_fill_mutex); 3728 req->r_err = err; 3729 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); 3730 mutex_unlock(&req->r_fill_mutex); 3731 3732 if (req->r_parent && 3733 (req->r_op & CEPH_MDS_OP_WRITE)) 3734 ceph_invalidate_dir_request(req); 3735 } else { 3736 err = req->r_err; 3737 } 3738 3739 mutex_unlock(&mdsc->mutex); 3740 return err; 3741 } 3742 3743 /* 3744 * Synchrously perform an mds request. Take care of all of the 3745 * session setup, forwarding, retry details. 3746 */ 3747 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 3748 struct inode *dir, 3749 struct ceph_mds_request *req) 3750 { 3751 struct ceph_client *cl = mdsc->fsc->client; 3752 int err; 3753 3754 doutc(cl, "do_request on %p\n", req); 3755 3756 /* issue */ 3757 err = ceph_mdsc_submit_request(mdsc, dir, req); 3758 if (!err) 3759 err = ceph_mdsc_wait_request(mdsc, req, NULL); 3760 doutc(cl, "do_request %p done, result %d\n", req, err); 3761 return err; 3762 } 3763 3764 /* 3765 * Invalidate dir's completeness, dentry lease state on an aborted MDS 3766 * namespace request. 3767 */ 3768 void ceph_invalidate_dir_request(struct ceph_mds_request *req) 3769 { 3770 struct inode *dir = req->r_parent; 3771 struct inode *old_dir = req->r_old_dentry_dir; 3772 struct ceph_client *cl = req->r_mdsc->fsc->client; 3773 3774 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n", 3775 dir, old_dir); 3776 3777 ceph_dir_clear_complete(dir); 3778 if (old_dir) 3779 ceph_dir_clear_complete(old_dir); 3780 if (req->r_dentry) 3781 ceph_invalidate_dentry_lease(req->r_dentry); 3782 if (req->r_old_dentry) 3783 ceph_invalidate_dentry_lease(req->r_old_dentry); 3784 } 3785 3786 /* 3787 * Handle mds reply. 3788 * 3789 * We take the session mutex and parse and process the reply immediately. 3790 * This preserves the logical ordering of replies, capabilities, etc., sent 3791 * by the MDS as they are applied to our local cache. 3792 */ 3793 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) 3794 { 3795 struct ceph_mds_client *mdsc = session->s_mdsc; 3796 struct ceph_client *cl = mdsc->fsc->client; 3797 struct ceph_mds_request *req; 3798 struct ceph_mds_reply_head *head = msg->front.iov_base; 3799 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ 3800 struct ceph_snap_realm *realm; 3801 u64 tid; 3802 int err, result; 3803 int mds = session->s_mds; 3804 bool close_sessions = false; 3805 3806 if (msg->front.iov_len < sizeof(*head)) { 3807 pr_err_client(cl, "got corrupt (short) reply\n"); 3808 ceph_msg_dump(msg); 3809 return; 3810 } 3811 3812 /* get request, session */ 3813 tid = le64_to_cpu(msg->hdr.tid); 3814 mutex_lock(&mdsc->mutex); 3815 req = lookup_get_request(mdsc, tid); 3816 if (!req) { 3817 doutc(cl, "on unknown tid %llu\n", tid); 3818 mutex_unlock(&mdsc->mutex); 3819 return; 3820 } 3821 doutc(cl, "handle_reply %p\n", req); 3822 3823 /* correct session? */ 3824 if (req->r_session != session) { 3825 pr_err_client(cl, "got %llu on session mds%d not mds%d\n", 3826 tid, session->s_mds, 3827 req->r_session ? req->r_session->s_mds : -1); 3828 mutex_unlock(&mdsc->mutex); 3829 goto out; 3830 } 3831 3832 /* dup? */ 3833 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) || 3834 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) { 3835 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n", 3836 head->safe ? "safe" : "unsafe", tid, mds); 3837 mutex_unlock(&mdsc->mutex); 3838 goto out; 3839 } 3840 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) { 3841 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n", 3842 tid, mds); 3843 mutex_unlock(&mdsc->mutex); 3844 goto out; 3845 } 3846 3847 result = le32_to_cpu(head->result); 3848 3849 if (head->safe) { 3850 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags); 3851 __unregister_request(mdsc, req); 3852 3853 /* last request during umount? */ 3854 if (mdsc->stopping && !__get_oldest_req(mdsc)) 3855 complete_all(&mdsc->safe_umount_waiters); 3856 3857 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 3858 /* 3859 * We already handled the unsafe response, now do the 3860 * cleanup. No need to examine the response; the MDS 3861 * doesn't include any result info in the safe 3862 * response. And even if it did, there is nothing 3863 * useful we could do with a revised return value. 3864 */ 3865 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds); 3866 3867 mutex_unlock(&mdsc->mutex); 3868 goto out; 3869 } 3870 } else { 3871 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags); 3872 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); 3873 } 3874 3875 doutc(cl, "tid %lld result %d\n", tid, result); 3876 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features)) 3877 err = parse_reply_info(session, msg, req, (u64)-1); 3878 else 3879 err = parse_reply_info(session, msg, req, 3880 session->s_con.peer_features); 3881 mutex_unlock(&mdsc->mutex); 3882 3883 /* Must find target inode outside of mutexes to avoid deadlocks */ 3884 rinfo = &req->r_reply_info; 3885 if ((err >= 0) && rinfo->head->is_target) { 3886 struct inode *in = xchg(&req->r_new_inode, NULL); 3887 struct ceph_vino tvino = { 3888 .ino = le64_to_cpu(rinfo->targeti.in->ino), 3889 .snap = le64_to_cpu(rinfo->targeti.in->snapid) 3890 }; 3891 3892 /* 3893 * If we ended up opening an existing inode, discard 3894 * r_new_inode 3895 */ 3896 if (req->r_op == CEPH_MDS_OP_CREATE && 3897 !req->r_reply_info.has_create_ino) { 3898 /* This should never happen on an async create */ 3899 WARN_ON_ONCE(req->r_deleg_ino); 3900 iput(in); 3901 in = NULL; 3902 } 3903 3904 in = ceph_get_inode(mdsc->fsc->sb, tvino, in); 3905 if (IS_ERR(in)) { 3906 err = PTR_ERR(in); 3907 mutex_lock(&session->s_mutex); 3908 goto out_err; 3909 } 3910 req->r_target_inode = in; 3911 } 3912 3913 mutex_lock(&session->s_mutex); 3914 if (err < 0) { 3915 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n", 3916 mds, tid); 3917 ceph_msg_dump(msg); 3918 goto out_err; 3919 } 3920 3921 /* snap trace */ 3922 realm = NULL; 3923 if (rinfo->snapblob_len) { 3924 down_write(&mdsc->snap_rwsem); 3925 err = ceph_update_snap_trace(mdsc, rinfo->snapblob, 3926 rinfo->snapblob + rinfo->snapblob_len, 3927 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, 3928 &realm); 3929 if (err) { 3930 up_write(&mdsc->snap_rwsem); 3931 close_sessions = true; 3932 if (err == -EIO) 3933 ceph_msg_dump(msg); 3934 goto out_err; 3935 } 3936 downgrade_write(&mdsc->snap_rwsem); 3937 } else { 3938 down_read(&mdsc->snap_rwsem); 3939 } 3940 3941 /* insert trace into our cache */ 3942 mutex_lock(&req->r_fill_mutex); 3943 current->journal_info = req; 3944 err = ceph_fill_trace(mdsc->fsc->sb, req); 3945 if (err == 0) { 3946 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || 3947 req->r_op == CEPH_MDS_OP_LSSNAP)) 3948 err = ceph_readdir_prepopulate(req, req->r_session); 3949 } 3950 current->journal_info = NULL; 3951 mutex_unlock(&req->r_fill_mutex); 3952 3953 up_read(&mdsc->snap_rwsem); 3954 if (realm) 3955 ceph_put_snap_realm(mdsc, realm); 3956 3957 if (err == 0) { 3958 if (req->r_target_inode && 3959 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { 3960 struct ceph_inode_info *ci = 3961 ceph_inode(req->r_target_inode); 3962 spin_lock(&ci->i_unsafe_lock); 3963 list_add_tail(&req->r_unsafe_target_item, 3964 &ci->i_unsafe_iops); 3965 spin_unlock(&ci->i_unsafe_lock); 3966 } 3967 3968 ceph_unreserve_caps(mdsc, &req->r_caps_reservation); 3969 } 3970 out_err: 3971 mutex_lock(&mdsc->mutex); 3972 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 3973 if (err) { 3974 req->r_err = err; 3975 } else { 3976 req->r_reply = ceph_msg_get(msg); 3977 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags); 3978 } 3979 } else { 3980 doutc(cl, "reply arrived after request %lld was aborted\n", tid); 3981 } 3982 mutex_unlock(&mdsc->mutex); 3983 3984 mutex_unlock(&session->s_mutex); 3985 3986 /* kick calling process */ 3987 complete_request(mdsc, req); 3988 3989 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency, 3990 req->r_end_latency, err); 3991 out: 3992 ceph_mdsc_put_request(req); 3993 3994 /* Defer closing the sessions after s_mutex lock being released */ 3995 if (close_sessions) 3996 ceph_mdsc_close_sessions(mdsc); 3997 return; 3998 } 3999 4000 4001 4002 /* 4003 * handle mds notification that our request has been forwarded. 4004 */ 4005 static void handle_forward(struct ceph_mds_client *mdsc, 4006 struct ceph_mds_session *session, 4007 struct ceph_msg *msg) 4008 { 4009 struct ceph_client *cl = mdsc->fsc->client; 4010 struct ceph_mds_request *req; 4011 u64 tid = le64_to_cpu(msg->hdr.tid); 4012 u32 next_mds; 4013 u32 fwd_seq; 4014 int err = -EINVAL; 4015 void *p = msg->front.iov_base; 4016 void *end = p + msg->front.iov_len; 4017 bool aborted = false; 4018 4019 ceph_decode_need(&p, end, 2*sizeof(u32), bad); 4020 next_mds = ceph_decode_32(&p); 4021 fwd_seq = ceph_decode_32(&p); 4022 4023 mutex_lock(&mdsc->mutex); 4024 req = lookup_get_request(mdsc, tid); 4025 if (!req) { 4026 mutex_unlock(&mdsc->mutex); 4027 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds); 4028 return; /* dup reply? */ 4029 } 4030 4031 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 4032 doutc(cl, "forward tid %llu aborted, unregistering\n", tid); 4033 __unregister_request(mdsc, req); 4034 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) { 4035 /* 4036 * Avoid inifinite retrying after overflow. 4037 * 4038 * The MDS will increase the fwd count and in client side 4039 * if the num_fwd is less than the one saved in request 4040 * that means the MDS is an old version and overflowed of 4041 * 8 bits. 4042 */ 4043 mutex_lock(&req->r_fill_mutex); 4044 req->r_err = -EMULTIHOP; 4045 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); 4046 mutex_unlock(&req->r_fill_mutex); 4047 aborted = true; 4048 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n", 4049 tid); 4050 } else { 4051 /* resend. forward race not possible; mds would drop */ 4052 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds); 4053 BUG_ON(req->r_err); 4054 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)); 4055 req->r_attempts = 0; 4056 req->r_num_fwd = fwd_seq; 4057 req->r_resend_mds = next_mds; 4058 put_request_session(req); 4059 __do_request(mdsc, req); 4060 } 4061 mutex_unlock(&mdsc->mutex); 4062 4063 /* kick calling process */ 4064 if (aborted) 4065 complete_request(mdsc, req); 4066 ceph_mdsc_put_request(req); 4067 return; 4068 4069 bad: 4070 pr_err_client(cl, "decode error err=%d\n", err); 4071 ceph_msg_dump(msg); 4072 } 4073 4074 static int __decode_session_metadata(void **p, void *end, 4075 bool *blocklisted) 4076 { 4077 /* map<string,string> */ 4078 u32 n; 4079 bool err_str; 4080 ceph_decode_32_safe(p, end, n, bad); 4081 while (n-- > 0) { 4082 u32 len; 4083 ceph_decode_32_safe(p, end, len, bad); 4084 ceph_decode_need(p, end, len, bad); 4085 err_str = !strncmp(*p, "error_string", len); 4086 *p += len; 4087 ceph_decode_32_safe(p, end, len, bad); 4088 ceph_decode_need(p, end, len, bad); 4089 /* 4090 * Match "blocklisted (blacklisted)" from newer MDSes, 4091 * or "blacklisted" from older MDSes. 4092 */ 4093 if (err_str && strnstr(*p, "blacklisted", len)) 4094 *blocklisted = true; 4095 *p += len; 4096 } 4097 return 0; 4098 bad: 4099 return -1; 4100 } 4101 4102 /* 4103 * handle a mds session control message 4104 */ 4105 static void handle_session(struct ceph_mds_session *session, 4106 struct ceph_msg *msg) 4107 { 4108 struct ceph_mds_client *mdsc = session->s_mdsc; 4109 struct ceph_client *cl = mdsc->fsc->client; 4110 int mds = session->s_mds; 4111 int msg_version = le16_to_cpu(msg->hdr.version); 4112 void *p = msg->front.iov_base; 4113 void *end = p + msg->front.iov_len; 4114 struct ceph_mds_session_head *h; 4115 u32 op; 4116 u64 seq, features = 0; 4117 int wake = 0; 4118 bool blocklisted = false; 4119 4120 /* decode */ 4121 ceph_decode_need(&p, end, sizeof(*h), bad); 4122 h = p; 4123 p += sizeof(*h); 4124 4125 op = le32_to_cpu(h->op); 4126 seq = le64_to_cpu(h->seq); 4127 4128 if (msg_version >= 3) { 4129 u32 len; 4130 /* version >= 2 and < 5, decode metadata, skip otherwise 4131 * as it's handled via flags. 4132 */ 4133 if (msg_version >= 5) 4134 ceph_decode_skip_map(&p, end, string, string, bad); 4135 else if (__decode_session_metadata(&p, end, &blocklisted) < 0) 4136 goto bad; 4137 4138 /* version >= 3, feature bits */ 4139 ceph_decode_32_safe(&p, end, len, bad); 4140 if (len) { 4141 ceph_decode_64_safe(&p, end, features, bad); 4142 p += len - sizeof(features); 4143 } 4144 } 4145 4146 if (msg_version >= 5) { 4147 u32 flags, len; 4148 4149 /* version >= 4 */ 4150 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */ 4151 ceph_decode_32_safe(&p, end, len, bad); /* len */ 4152 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */ 4153 4154 /* version >= 5, flags */ 4155 ceph_decode_32_safe(&p, end, flags, bad); 4156 if (flags & CEPH_SESSION_BLOCKLISTED) { 4157 pr_warn_client(cl, "mds%d session blocklisted\n", 4158 session->s_mds); 4159 blocklisted = true; 4160 } 4161 } 4162 4163 mutex_lock(&mdsc->mutex); 4164 if (op == CEPH_SESSION_CLOSE) { 4165 ceph_get_mds_session(session); 4166 __unregister_session(mdsc, session); 4167 } 4168 /* FIXME: this ttl calculation is generous */ 4169 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; 4170 mutex_unlock(&mdsc->mutex); 4171 4172 mutex_lock(&session->s_mutex); 4173 4174 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds, 4175 ceph_session_op_name(op), session, 4176 ceph_session_state_name(session->s_state), seq); 4177 4178 if (session->s_state == CEPH_MDS_SESSION_HUNG) { 4179 session->s_state = CEPH_MDS_SESSION_OPEN; 4180 pr_info_client(cl, "mds%d came back\n", session->s_mds); 4181 } 4182 4183 switch (op) { 4184 case CEPH_SESSION_OPEN: 4185 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 4186 pr_info_client(cl, "mds%d reconnect success\n", 4187 session->s_mds); 4188 4189 session->s_features = features; 4190 if (session->s_state == CEPH_MDS_SESSION_OPEN) { 4191 pr_notice_client(cl, "mds%d is already opened\n", 4192 session->s_mds); 4193 } else { 4194 session->s_state = CEPH_MDS_SESSION_OPEN; 4195 renewed_caps(mdsc, session, 0); 4196 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, 4197 &session->s_features)) 4198 metric_schedule_delayed(&mdsc->metric); 4199 } 4200 4201 /* 4202 * The connection maybe broken and the session in client 4203 * side has been reinitialized, need to update the seq 4204 * anyway. 4205 */ 4206 if (!session->s_seq && seq) 4207 session->s_seq = seq; 4208 4209 wake = 1; 4210 if (mdsc->stopping) 4211 __close_session(mdsc, session); 4212 break; 4213 4214 case CEPH_SESSION_RENEWCAPS: 4215 if (session->s_renew_seq == seq) 4216 renewed_caps(mdsc, session, 1); 4217 break; 4218 4219 case CEPH_SESSION_CLOSE: 4220 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) 4221 pr_info_client(cl, "mds%d reconnect denied\n", 4222 session->s_mds); 4223 session->s_state = CEPH_MDS_SESSION_CLOSED; 4224 cleanup_session_requests(mdsc, session); 4225 remove_session_caps(session); 4226 wake = 2; /* for good measure */ 4227 wake_up_all(&mdsc->session_close_wq); 4228 break; 4229 4230 case CEPH_SESSION_STALE: 4231 pr_info_client(cl, "mds%d caps went stale, renewing\n", 4232 session->s_mds); 4233 atomic_inc(&session->s_cap_gen); 4234 session->s_cap_ttl = jiffies - 1; 4235 send_renew_caps(mdsc, session); 4236 break; 4237 4238 case CEPH_SESSION_RECALL_STATE: 4239 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); 4240 break; 4241 4242 case CEPH_SESSION_FLUSHMSG: 4243 /* flush cap releases */ 4244 spin_lock(&session->s_cap_lock); 4245 if (session->s_num_cap_releases) 4246 ceph_flush_cap_releases(mdsc, session); 4247 spin_unlock(&session->s_cap_lock); 4248 4249 send_flushmsg_ack(mdsc, session, seq); 4250 break; 4251 4252 case CEPH_SESSION_FORCE_RO: 4253 doutc(cl, "force_session_readonly %p\n", session); 4254 spin_lock(&session->s_cap_lock); 4255 session->s_readonly = true; 4256 spin_unlock(&session->s_cap_lock); 4257 wake_up_session_caps(session, FORCE_RO); 4258 break; 4259 4260 case CEPH_SESSION_REJECT: 4261 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING); 4262 pr_info_client(cl, "mds%d rejected session\n", 4263 session->s_mds); 4264 session->s_state = CEPH_MDS_SESSION_REJECTED; 4265 cleanup_session_requests(mdsc, session); 4266 remove_session_caps(session); 4267 if (blocklisted) 4268 mdsc->fsc->blocklisted = true; 4269 wake = 2; /* for good measure */ 4270 break; 4271 4272 default: 4273 pr_err_client(cl, "bad op %d mds%d\n", op, mds); 4274 WARN_ON(1); 4275 } 4276 4277 mutex_unlock(&session->s_mutex); 4278 if (wake) { 4279 mutex_lock(&mdsc->mutex); 4280 __wake_requests(mdsc, &session->s_waiting); 4281 if (wake == 2) 4282 kick_requests(mdsc, mds); 4283 mutex_unlock(&mdsc->mutex); 4284 } 4285 if (op == CEPH_SESSION_CLOSE) 4286 ceph_put_mds_session(session); 4287 return; 4288 4289 bad: 4290 pr_err_client(cl, "corrupt message mds%d len %d\n", mds, 4291 (int)msg->front.iov_len); 4292 ceph_msg_dump(msg); 4293 return; 4294 } 4295 4296 void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req) 4297 { 4298 struct ceph_client *cl = req->r_mdsc->fsc->client; 4299 int dcaps; 4300 4301 dcaps = xchg(&req->r_dir_caps, 0); 4302 if (dcaps) { 4303 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); 4304 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps); 4305 } 4306 } 4307 4308 void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req) 4309 { 4310 struct ceph_client *cl = req->r_mdsc->fsc->client; 4311 int dcaps; 4312 4313 dcaps = xchg(&req->r_dir_caps, 0); 4314 if (dcaps) { 4315 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); 4316 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps); 4317 } 4318 } 4319 4320 /* 4321 * called under session->mutex. 4322 */ 4323 static void replay_unsafe_requests(struct ceph_mds_client *mdsc, 4324 struct ceph_mds_session *session) 4325 { 4326 struct ceph_mds_request *req, *nreq; 4327 struct rb_node *p; 4328 4329 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds); 4330 4331 mutex_lock(&mdsc->mutex); 4332 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) 4333 __send_request(session, req, true); 4334 4335 /* 4336 * also re-send old requests when MDS enters reconnect stage. So that MDS 4337 * can process completed request in clientreplay stage. 4338 */ 4339 p = rb_first(&mdsc->request_tree); 4340 while (p) { 4341 req = rb_entry(p, struct ceph_mds_request, r_node); 4342 p = rb_next(p); 4343 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) 4344 continue; 4345 if (req->r_attempts == 0) 4346 continue; /* only old requests */ 4347 if (!req->r_session) 4348 continue; 4349 if (req->r_session->s_mds != session->s_mds) 4350 continue; 4351 4352 ceph_mdsc_release_dir_caps_async(req); 4353 4354 __send_request(session, req, true); 4355 } 4356 mutex_unlock(&mdsc->mutex); 4357 } 4358 4359 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state) 4360 { 4361 struct ceph_msg *reply; 4362 struct ceph_pagelist *_pagelist; 4363 struct page *page; 4364 __le32 *addr; 4365 int err = -ENOMEM; 4366 4367 if (!recon_state->allow_multi) 4368 return -ENOSPC; 4369 4370 /* can't handle message that contains both caps and realm */ 4371 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms); 4372 4373 /* pre-allocate new pagelist */ 4374 _pagelist = ceph_pagelist_alloc(GFP_NOFS); 4375 if (!_pagelist) 4376 return -ENOMEM; 4377 4378 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); 4379 if (!reply) 4380 goto fail_msg; 4381 4382 /* placeholder for nr_caps */ 4383 err = ceph_pagelist_encode_32(_pagelist, 0); 4384 if (err < 0) 4385 goto fail; 4386 4387 if (recon_state->nr_caps) { 4388 /* currently encoding caps */ 4389 err = ceph_pagelist_encode_32(recon_state->pagelist, 0); 4390 if (err) 4391 goto fail; 4392 } else { 4393 /* placeholder for nr_realms (currently encoding relams) */ 4394 err = ceph_pagelist_encode_32(_pagelist, 0); 4395 if (err < 0) 4396 goto fail; 4397 } 4398 4399 err = ceph_pagelist_encode_8(recon_state->pagelist, 1); 4400 if (err) 4401 goto fail; 4402 4403 page = list_first_entry(&recon_state->pagelist->head, struct page, lru); 4404 addr = kmap_atomic(page); 4405 if (recon_state->nr_caps) { 4406 /* currently encoding caps */ 4407 *addr = cpu_to_le32(recon_state->nr_caps); 4408 } else { 4409 /* currently encoding relams */ 4410 *(addr + 1) = cpu_to_le32(recon_state->nr_realms); 4411 } 4412 kunmap_atomic(addr); 4413 4414 reply->hdr.version = cpu_to_le16(5); 4415 reply->hdr.compat_version = cpu_to_le16(4); 4416 4417 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length); 4418 ceph_msg_data_add_pagelist(reply, recon_state->pagelist); 4419 4420 ceph_con_send(&recon_state->session->s_con, reply); 4421 ceph_pagelist_release(recon_state->pagelist); 4422 4423 recon_state->pagelist = _pagelist; 4424 recon_state->nr_caps = 0; 4425 recon_state->nr_realms = 0; 4426 recon_state->msg_version = 5; 4427 return 0; 4428 fail: 4429 ceph_msg_put(reply); 4430 fail_msg: 4431 ceph_pagelist_release(_pagelist); 4432 return err; 4433 } 4434 4435 static struct dentry* d_find_primary(struct inode *inode) 4436 { 4437 struct dentry *alias, *dn = NULL; 4438 4439 if (hlist_empty(&inode->i_dentry)) 4440 return NULL; 4441 4442 spin_lock(&inode->i_lock); 4443 if (hlist_empty(&inode->i_dentry)) 4444 goto out_unlock; 4445 4446 if (S_ISDIR(inode->i_mode)) { 4447 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias); 4448 if (!IS_ROOT(alias)) 4449 dn = dget(alias); 4450 goto out_unlock; 4451 } 4452 4453 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 4454 spin_lock(&alias->d_lock); 4455 if (!d_unhashed(alias) && 4456 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) { 4457 dn = dget_dlock(alias); 4458 } 4459 spin_unlock(&alias->d_lock); 4460 if (dn) 4461 break; 4462 } 4463 out_unlock: 4464 spin_unlock(&inode->i_lock); 4465 return dn; 4466 } 4467 4468 /* 4469 * Encode information about a cap for a reconnect with the MDS. 4470 */ 4471 static int reconnect_caps_cb(struct inode *inode, int mds, void *arg) 4472 { 4473 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 4474 struct ceph_client *cl = ceph_inode_to_client(inode); 4475 union { 4476 struct ceph_mds_cap_reconnect v2; 4477 struct ceph_mds_cap_reconnect_v1 v1; 4478 } rec; 4479 struct ceph_inode_info *ci = ceph_inode(inode); 4480 struct ceph_reconnect_state *recon_state = arg; 4481 struct ceph_pagelist *pagelist = recon_state->pagelist; 4482 struct dentry *dentry; 4483 struct ceph_cap *cap; 4484 char *path; 4485 int pathlen = 0, err; 4486 u64 pathbase; 4487 u64 snap_follows; 4488 4489 dentry = d_find_primary(inode); 4490 if (dentry) { 4491 /* set pathbase to parent dir when msg_version >= 2 */ 4492 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 4493 recon_state->msg_version >= 2); 4494 dput(dentry); 4495 if (IS_ERR(path)) { 4496 err = PTR_ERR(path); 4497 goto out_err; 4498 } 4499 } else { 4500 path = NULL; 4501 pathbase = 0; 4502 } 4503 4504 spin_lock(&ci->i_ceph_lock); 4505 cap = __get_cap_for_mds(ci, mds); 4506 if (!cap) { 4507 spin_unlock(&ci->i_ceph_lock); 4508 err = 0; 4509 goto out_err; 4510 } 4511 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode, 4512 ceph_vinop(inode), cap, cap->cap_id, 4513 ceph_cap_string(cap->issued)); 4514 4515 cap->seq = 0; /* reset cap seq */ 4516 cap->issue_seq = 0; /* and issue_seq */ 4517 cap->mseq = 0; /* and migrate_seq */ 4518 cap->cap_gen = atomic_read(&cap->session->s_cap_gen); 4519 4520 /* These are lost when the session goes away */ 4521 if (S_ISDIR(inode->i_mode)) { 4522 if (cap->issued & CEPH_CAP_DIR_CREATE) { 4523 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); 4524 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); 4525 } 4526 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS; 4527 } 4528 4529 if (recon_state->msg_version >= 2) { 4530 rec.v2.cap_id = cpu_to_le64(cap->cap_id); 4531 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 4532 rec.v2.issued = cpu_to_le32(cap->issued); 4533 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 4534 rec.v2.pathbase = cpu_to_le64(pathbase); 4535 rec.v2.flock_len = (__force __le32) 4536 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1); 4537 } else { 4538 struct timespec64 ts; 4539 4540 rec.v1.cap_id = cpu_to_le64(cap->cap_id); 4541 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); 4542 rec.v1.issued = cpu_to_le32(cap->issued); 4543 rec.v1.size = cpu_to_le64(i_size_read(inode)); 4544 ts = inode_get_mtime(inode); 4545 ceph_encode_timespec64(&rec.v1.mtime, &ts); 4546 ts = inode_get_atime(inode); 4547 ceph_encode_timespec64(&rec.v1.atime, &ts); 4548 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); 4549 rec.v1.pathbase = cpu_to_le64(pathbase); 4550 } 4551 4552 if (list_empty(&ci->i_cap_snaps)) { 4553 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0; 4554 } else { 4555 struct ceph_cap_snap *capsnap = 4556 list_first_entry(&ci->i_cap_snaps, 4557 struct ceph_cap_snap, ci_item); 4558 snap_follows = capsnap->follows; 4559 } 4560 spin_unlock(&ci->i_ceph_lock); 4561 4562 if (recon_state->msg_version >= 2) { 4563 int num_fcntl_locks, num_flock_locks; 4564 struct ceph_filelock *flocks = NULL; 4565 size_t struct_len, total_len = sizeof(u64); 4566 u8 struct_v = 0; 4567 4568 encode_again: 4569 if (rec.v2.flock_len) { 4570 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); 4571 } else { 4572 num_fcntl_locks = 0; 4573 num_flock_locks = 0; 4574 } 4575 if (num_fcntl_locks + num_flock_locks > 0) { 4576 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks, 4577 sizeof(struct ceph_filelock), 4578 GFP_NOFS); 4579 if (!flocks) { 4580 err = -ENOMEM; 4581 goto out_err; 4582 } 4583 err = ceph_encode_locks_to_buffer(inode, flocks, 4584 num_fcntl_locks, 4585 num_flock_locks); 4586 if (err) { 4587 kfree(flocks); 4588 flocks = NULL; 4589 if (err == -ENOSPC) 4590 goto encode_again; 4591 goto out_err; 4592 } 4593 } else { 4594 kfree(flocks); 4595 flocks = NULL; 4596 } 4597 4598 if (recon_state->msg_version >= 3) { 4599 /* version, compat_version and struct_len */ 4600 total_len += 2 * sizeof(u8) + sizeof(u32); 4601 struct_v = 2; 4602 } 4603 /* 4604 * number of encoded locks is stable, so copy to pagelist 4605 */ 4606 struct_len = 2 * sizeof(u32) + 4607 (num_fcntl_locks + num_flock_locks) * 4608 sizeof(struct ceph_filelock); 4609 rec.v2.flock_len = cpu_to_le32(struct_len); 4610 4611 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2); 4612 4613 if (struct_v >= 2) 4614 struct_len += sizeof(u64); /* snap_follows */ 4615 4616 total_len += struct_len; 4617 4618 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) { 4619 err = send_reconnect_partial(recon_state); 4620 if (err) 4621 goto out_freeflocks; 4622 pagelist = recon_state->pagelist; 4623 } 4624 4625 err = ceph_pagelist_reserve(pagelist, total_len); 4626 if (err) 4627 goto out_freeflocks; 4628 4629 ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); 4630 if (recon_state->msg_version >= 3) { 4631 ceph_pagelist_encode_8(pagelist, struct_v); 4632 ceph_pagelist_encode_8(pagelist, 1); 4633 ceph_pagelist_encode_32(pagelist, struct_len); 4634 } 4635 ceph_pagelist_encode_string(pagelist, path, pathlen); 4636 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2)); 4637 ceph_locks_to_pagelist(flocks, pagelist, 4638 num_fcntl_locks, num_flock_locks); 4639 if (struct_v >= 2) 4640 ceph_pagelist_encode_64(pagelist, snap_follows); 4641 out_freeflocks: 4642 kfree(flocks); 4643 } else { 4644 err = ceph_pagelist_reserve(pagelist, 4645 sizeof(u64) + sizeof(u32) + 4646 pathlen + sizeof(rec.v1)); 4647 if (err) 4648 goto out_err; 4649 4650 ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); 4651 ceph_pagelist_encode_string(pagelist, path, pathlen); 4652 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1)); 4653 } 4654 4655 out_err: 4656 ceph_mdsc_free_path(path, pathlen); 4657 if (!err) 4658 recon_state->nr_caps++; 4659 return err; 4660 } 4661 4662 static int encode_snap_realms(struct ceph_mds_client *mdsc, 4663 struct ceph_reconnect_state *recon_state) 4664 { 4665 struct rb_node *p; 4666 struct ceph_pagelist *pagelist = recon_state->pagelist; 4667 struct ceph_client *cl = mdsc->fsc->client; 4668 int err = 0; 4669 4670 if (recon_state->msg_version >= 4) { 4671 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms); 4672 if (err < 0) 4673 goto fail; 4674 } 4675 4676 /* 4677 * snaprealms. we provide mds with the ino, seq (version), and 4678 * parent for all of our realms. If the mds has any newer info, 4679 * it will tell us. 4680 */ 4681 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { 4682 struct ceph_snap_realm *realm = 4683 rb_entry(p, struct ceph_snap_realm, node); 4684 struct ceph_mds_snaprealm_reconnect sr_rec; 4685 4686 if (recon_state->msg_version >= 4) { 4687 size_t need = sizeof(u8) * 2 + sizeof(u32) + 4688 sizeof(sr_rec); 4689 4690 if (pagelist->length + need > RECONNECT_MAX_SIZE) { 4691 err = send_reconnect_partial(recon_state); 4692 if (err) 4693 goto fail; 4694 pagelist = recon_state->pagelist; 4695 } 4696 4697 err = ceph_pagelist_reserve(pagelist, need); 4698 if (err) 4699 goto fail; 4700 4701 ceph_pagelist_encode_8(pagelist, 1); 4702 ceph_pagelist_encode_8(pagelist, 1); 4703 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec)); 4704 } 4705 4706 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n", 4707 realm->ino, realm->seq, realm->parent_ino); 4708 sr_rec.ino = cpu_to_le64(realm->ino); 4709 sr_rec.seq = cpu_to_le64(realm->seq); 4710 sr_rec.parent = cpu_to_le64(realm->parent_ino); 4711 4712 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); 4713 if (err) 4714 goto fail; 4715 4716 recon_state->nr_realms++; 4717 } 4718 fail: 4719 return err; 4720 } 4721 4722 4723 /* 4724 * If an MDS fails and recovers, clients need to reconnect in order to 4725 * reestablish shared state. This includes all caps issued through 4726 * this session _and_ the snap_realm hierarchy. Because it's not 4727 * clear which snap realms the mds cares about, we send everything we 4728 * know about.. that ensures we'll then get any new info the 4729 * recovering MDS might have. 4730 * 4731 * This is a relatively heavyweight operation, but it's rare. 4732 */ 4733 static void send_mds_reconnect(struct ceph_mds_client *mdsc, 4734 struct ceph_mds_session *session) 4735 { 4736 struct ceph_client *cl = mdsc->fsc->client; 4737 struct ceph_msg *reply; 4738 int mds = session->s_mds; 4739 int err = -ENOMEM; 4740 struct ceph_reconnect_state recon_state = { 4741 .session = session, 4742 }; 4743 LIST_HEAD(dispose); 4744 4745 pr_info_client(cl, "mds%d reconnect start\n", mds); 4746 4747 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS); 4748 if (!recon_state.pagelist) 4749 goto fail_nopagelist; 4750 4751 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); 4752 if (!reply) 4753 goto fail_nomsg; 4754 4755 xa_destroy(&session->s_delegated_inos); 4756 4757 mutex_lock(&session->s_mutex); 4758 session->s_state = CEPH_MDS_SESSION_RECONNECTING; 4759 session->s_seq = 0; 4760 4761 doutc(cl, "session %p state %s\n", session, 4762 ceph_session_state_name(session->s_state)); 4763 4764 atomic_inc(&session->s_cap_gen); 4765 4766 spin_lock(&session->s_cap_lock); 4767 /* don't know if session is readonly */ 4768 session->s_readonly = 0; 4769 /* 4770 * notify __ceph_remove_cap() that we are composing cap reconnect. 4771 * If a cap get released before being added to the cap reconnect, 4772 * __ceph_remove_cap() should skip queuing cap release. 4773 */ 4774 session->s_cap_reconnect = 1; 4775 /* drop old cap expires; we're about to reestablish that state */ 4776 detach_cap_releases(session, &dispose); 4777 spin_unlock(&session->s_cap_lock); 4778 dispose_cap_releases(mdsc, &dispose); 4779 4780 /* trim unused caps to reduce MDS's cache rejoin time */ 4781 if (mdsc->fsc->sb->s_root) 4782 shrink_dcache_parent(mdsc->fsc->sb->s_root); 4783 4784 ceph_con_close(&session->s_con); 4785 ceph_con_open(&session->s_con, 4786 CEPH_ENTITY_TYPE_MDS, mds, 4787 ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); 4788 4789 /* replay unsafe requests */ 4790 replay_unsafe_requests(mdsc, session); 4791 4792 ceph_early_kick_flushing_caps(mdsc, session); 4793 4794 down_read(&mdsc->snap_rwsem); 4795 4796 /* placeholder for nr_caps */ 4797 err = ceph_pagelist_encode_32(recon_state.pagelist, 0); 4798 if (err) 4799 goto fail; 4800 4801 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) { 4802 recon_state.msg_version = 3; 4803 recon_state.allow_multi = true; 4804 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) { 4805 recon_state.msg_version = 3; 4806 } else { 4807 recon_state.msg_version = 2; 4808 } 4809 /* trsaverse this session's caps */ 4810 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state); 4811 4812 spin_lock(&session->s_cap_lock); 4813 session->s_cap_reconnect = 0; 4814 spin_unlock(&session->s_cap_lock); 4815 4816 if (err < 0) 4817 goto fail; 4818 4819 /* check if all realms can be encoded into current message */ 4820 if (mdsc->num_snap_realms) { 4821 size_t total_len = 4822 recon_state.pagelist->length + 4823 mdsc->num_snap_realms * 4824 sizeof(struct ceph_mds_snaprealm_reconnect); 4825 if (recon_state.msg_version >= 4) { 4826 /* number of realms */ 4827 total_len += sizeof(u32); 4828 /* version, compat_version and struct_len */ 4829 total_len += mdsc->num_snap_realms * 4830 (2 * sizeof(u8) + sizeof(u32)); 4831 } 4832 if (total_len > RECONNECT_MAX_SIZE) { 4833 if (!recon_state.allow_multi) { 4834 err = -ENOSPC; 4835 goto fail; 4836 } 4837 if (recon_state.nr_caps) { 4838 err = send_reconnect_partial(&recon_state); 4839 if (err) 4840 goto fail; 4841 } 4842 recon_state.msg_version = 5; 4843 } 4844 } 4845 4846 err = encode_snap_realms(mdsc, &recon_state); 4847 if (err < 0) 4848 goto fail; 4849 4850 if (recon_state.msg_version >= 5) { 4851 err = ceph_pagelist_encode_8(recon_state.pagelist, 0); 4852 if (err < 0) 4853 goto fail; 4854 } 4855 4856 if (recon_state.nr_caps || recon_state.nr_realms) { 4857 struct page *page = 4858 list_first_entry(&recon_state.pagelist->head, 4859 struct page, lru); 4860 __le32 *addr = kmap_atomic(page); 4861 if (recon_state.nr_caps) { 4862 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms); 4863 *addr = cpu_to_le32(recon_state.nr_caps); 4864 } else if (recon_state.msg_version >= 4) { 4865 *(addr + 1) = cpu_to_le32(recon_state.nr_realms); 4866 } 4867 kunmap_atomic(addr); 4868 } 4869 4870 reply->hdr.version = cpu_to_le16(recon_state.msg_version); 4871 if (recon_state.msg_version >= 4) 4872 reply->hdr.compat_version = cpu_to_le16(4); 4873 4874 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length); 4875 ceph_msg_data_add_pagelist(reply, recon_state.pagelist); 4876 4877 ceph_con_send(&session->s_con, reply); 4878 4879 mutex_unlock(&session->s_mutex); 4880 4881 mutex_lock(&mdsc->mutex); 4882 __wake_requests(mdsc, &session->s_waiting); 4883 mutex_unlock(&mdsc->mutex); 4884 4885 up_read(&mdsc->snap_rwsem); 4886 ceph_pagelist_release(recon_state.pagelist); 4887 return; 4888 4889 fail: 4890 ceph_msg_put(reply); 4891 up_read(&mdsc->snap_rwsem); 4892 mutex_unlock(&session->s_mutex); 4893 fail_nomsg: 4894 ceph_pagelist_release(recon_state.pagelist); 4895 fail_nopagelist: 4896 pr_err_client(cl, "error %d preparing reconnect for mds%d\n", 4897 err, mds); 4898 return; 4899 } 4900 4901 4902 /* 4903 * compare old and new mdsmaps, kicking requests 4904 * and closing out old connections as necessary 4905 * 4906 * called under mdsc->mutex. 4907 */ 4908 static void check_new_map(struct ceph_mds_client *mdsc, 4909 struct ceph_mdsmap *newmap, 4910 struct ceph_mdsmap *oldmap) 4911 { 4912 int i, j, err; 4913 int oldstate, newstate; 4914 struct ceph_mds_session *s; 4915 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0}; 4916 struct ceph_client *cl = mdsc->fsc->client; 4917 4918 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch); 4919 4920 if (newmap->m_info) { 4921 for (i = 0; i < newmap->possible_max_rank; i++) { 4922 for (j = 0; j < newmap->m_info[i].num_export_targets; j++) 4923 set_bit(newmap->m_info[i].export_targets[j], targets); 4924 } 4925 } 4926 4927 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) { 4928 if (!mdsc->sessions[i]) 4929 continue; 4930 s = mdsc->sessions[i]; 4931 oldstate = ceph_mdsmap_get_state(oldmap, i); 4932 newstate = ceph_mdsmap_get_state(newmap, i); 4933 4934 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n", 4935 i, ceph_mds_state_name(oldstate), 4936 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", 4937 ceph_mds_state_name(newstate), 4938 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", 4939 ceph_session_state_name(s->s_state)); 4940 4941 if (i >= newmap->possible_max_rank) { 4942 /* force close session for stopped mds */ 4943 ceph_get_mds_session(s); 4944 __unregister_session(mdsc, s); 4945 __wake_requests(mdsc, &s->s_waiting); 4946 mutex_unlock(&mdsc->mutex); 4947 4948 mutex_lock(&s->s_mutex); 4949 cleanup_session_requests(mdsc, s); 4950 remove_session_caps(s); 4951 mutex_unlock(&s->s_mutex); 4952 4953 ceph_put_mds_session(s); 4954 4955 mutex_lock(&mdsc->mutex); 4956 kick_requests(mdsc, i); 4957 continue; 4958 } 4959 4960 if (memcmp(ceph_mdsmap_get_addr(oldmap, i), 4961 ceph_mdsmap_get_addr(newmap, i), 4962 sizeof(struct ceph_entity_addr))) { 4963 /* just close it */ 4964 mutex_unlock(&mdsc->mutex); 4965 mutex_lock(&s->s_mutex); 4966 mutex_lock(&mdsc->mutex); 4967 ceph_con_close(&s->s_con); 4968 mutex_unlock(&s->s_mutex); 4969 s->s_state = CEPH_MDS_SESSION_RESTARTING; 4970 } else if (oldstate == newstate) { 4971 continue; /* nothing new with this mds */ 4972 } 4973 4974 /* 4975 * send reconnect? 4976 */ 4977 if (s->s_state == CEPH_MDS_SESSION_RESTARTING && 4978 newstate >= CEPH_MDS_STATE_RECONNECT) { 4979 mutex_unlock(&mdsc->mutex); 4980 clear_bit(i, targets); 4981 send_mds_reconnect(mdsc, s); 4982 mutex_lock(&mdsc->mutex); 4983 } 4984 4985 /* 4986 * kick request on any mds that has gone active. 4987 */ 4988 if (oldstate < CEPH_MDS_STATE_ACTIVE && 4989 newstate >= CEPH_MDS_STATE_ACTIVE) { 4990 if (oldstate != CEPH_MDS_STATE_CREATING && 4991 oldstate != CEPH_MDS_STATE_STARTING) 4992 pr_info_client(cl, "mds%d recovery completed\n", 4993 s->s_mds); 4994 kick_requests(mdsc, i); 4995 mutex_unlock(&mdsc->mutex); 4996 mutex_lock(&s->s_mutex); 4997 mutex_lock(&mdsc->mutex); 4998 ceph_kick_flushing_caps(mdsc, s); 4999 mutex_unlock(&s->s_mutex); 5000 wake_up_session_caps(s, RECONNECT); 5001 } 5002 } 5003 5004 /* 5005 * Only open and reconnect sessions that don't exist yet. 5006 */ 5007 for (i = 0; i < newmap->possible_max_rank; i++) { 5008 /* 5009 * In case the import MDS is crashed just after 5010 * the EImportStart journal is flushed, so when 5011 * a standby MDS takes over it and is replaying 5012 * the EImportStart journal the new MDS daemon 5013 * will wait the client to reconnect it, but the 5014 * client may never register/open the session yet. 5015 * 5016 * Will try to reconnect that MDS daemon if the 5017 * rank number is in the export targets array and 5018 * is the up:reconnect state. 5019 */ 5020 newstate = ceph_mdsmap_get_state(newmap, i); 5021 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT) 5022 continue; 5023 5024 /* 5025 * The session maybe registered and opened by some 5026 * requests which were choosing random MDSes during 5027 * the mdsc->mutex's unlock/lock gap below in rare 5028 * case. But the related MDS daemon will just queue 5029 * that requests and be still waiting for the client's 5030 * reconnection request in up:reconnect state. 5031 */ 5032 s = __ceph_lookup_mds_session(mdsc, i); 5033 if (likely(!s)) { 5034 s = __open_export_target_session(mdsc, i); 5035 if (IS_ERR(s)) { 5036 err = PTR_ERR(s); 5037 pr_err_client(cl, 5038 "failed to open export target session, err %d\n", 5039 err); 5040 continue; 5041 } 5042 } 5043 doutc(cl, "send reconnect to export target mds.%d\n", i); 5044 mutex_unlock(&mdsc->mutex); 5045 send_mds_reconnect(mdsc, s); 5046 ceph_put_mds_session(s); 5047 mutex_lock(&mdsc->mutex); 5048 } 5049 5050 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) { 5051 s = mdsc->sessions[i]; 5052 if (!s) 5053 continue; 5054 if (!ceph_mdsmap_is_laggy(newmap, i)) 5055 continue; 5056 if (s->s_state == CEPH_MDS_SESSION_OPEN || 5057 s->s_state == CEPH_MDS_SESSION_HUNG || 5058 s->s_state == CEPH_MDS_SESSION_CLOSING) { 5059 doutc(cl, " connecting to export targets of laggy mds%d\n", i); 5060 __open_export_target_sessions(mdsc, s); 5061 } 5062 } 5063 } 5064 5065 5066 5067 /* 5068 * leases 5069 */ 5070 5071 /* 5072 * caller must hold session s_mutex, dentry->d_lock 5073 */ 5074 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) 5075 { 5076 struct ceph_dentry_info *di = ceph_dentry(dentry); 5077 5078 ceph_put_mds_session(di->lease_session); 5079 di->lease_session = NULL; 5080 } 5081 5082 static void handle_lease(struct ceph_mds_client *mdsc, 5083 struct ceph_mds_session *session, 5084 struct ceph_msg *msg) 5085 { 5086 struct ceph_client *cl = mdsc->fsc->client; 5087 struct super_block *sb = mdsc->fsc->sb; 5088 struct inode *inode; 5089 struct dentry *parent, *dentry; 5090 struct ceph_dentry_info *di; 5091 int mds = session->s_mds; 5092 struct ceph_mds_lease *h = msg->front.iov_base; 5093 u32 seq; 5094 struct ceph_vino vino; 5095 struct qstr dname; 5096 int release = 0; 5097 5098 doutc(cl, "from mds%d\n", mds); 5099 5100 if (!ceph_inc_mds_stopping_blocker(mdsc, session)) 5101 return; 5102 5103 /* decode */ 5104 if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) 5105 goto bad; 5106 vino.ino = le64_to_cpu(h->ino); 5107 vino.snap = CEPH_NOSNAP; 5108 seq = le32_to_cpu(h->seq); 5109 dname.len = get_unaligned_le32(h + 1); 5110 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len) 5111 goto bad; 5112 dname.name = (void *)(h + 1) + sizeof(u32); 5113 5114 /* lookup inode */ 5115 inode = ceph_find_inode(sb, vino); 5116 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action), 5117 vino.ino, inode, dname.len, dname.name); 5118 5119 mutex_lock(&session->s_mutex); 5120 if (!inode) { 5121 doutc(cl, "no inode %llx\n", vino.ino); 5122 goto release; 5123 } 5124 5125 /* dentry */ 5126 parent = d_find_alias(inode); 5127 if (!parent) { 5128 doutc(cl, "no parent dentry on inode %p\n", inode); 5129 WARN_ON(1); 5130 goto release; /* hrm... */ 5131 } 5132 dname.hash = full_name_hash(parent, dname.name, dname.len); 5133 dentry = d_lookup(parent, &dname); 5134 dput(parent); 5135 if (!dentry) 5136 goto release; 5137 5138 spin_lock(&dentry->d_lock); 5139 di = ceph_dentry(dentry); 5140 switch (h->action) { 5141 case CEPH_MDS_LEASE_REVOKE: 5142 if (di->lease_session == session) { 5143 if (ceph_seq_cmp(di->lease_seq, seq) > 0) 5144 h->seq = cpu_to_le32(di->lease_seq); 5145 __ceph_mdsc_drop_dentry_lease(dentry); 5146 } 5147 release = 1; 5148 break; 5149 5150 case CEPH_MDS_LEASE_RENEW: 5151 if (di->lease_session == session && 5152 di->lease_gen == atomic_read(&session->s_cap_gen) && 5153 di->lease_renew_from && 5154 di->lease_renew_after == 0) { 5155 unsigned long duration = 5156 msecs_to_jiffies(le32_to_cpu(h->duration_ms)); 5157 5158 di->lease_seq = seq; 5159 di->time = di->lease_renew_from + duration; 5160 di->lease_renew_after = di->lease_renew_from + 5161 (duration >> 1); 5162 di->lease_renew_from = 0; 5163 } 5164 break; 5165 } 5166 spin_unlock(&dentry->d_lock); 5167 dput(dentry); 5168 5169 if (!release) 5170 goto out; 5171 5172 release: 5173 /* let's just reuse the same message */ 5174 h->action = CEPH_MDS_LEASE_REVOKE_ACK; 5175 ceph_msg_get(msg); 5176 ceph_con_send(&session->s_con, msg); 5177 5178 out: 5179 mutex_unlock(&session->s_mutex); 5180 iput(inode); 5181 5182 ceph_dec_mds_stopping_blocker(mdsc); 5183 return; 5184 5185 bad: 5186 ceph_dec_mds_stopping_blocker(mdsc); 5187 5188 pr_err_client(cl, "corrupt lease message\n"); 5189 ceph_msg_dump(msg); 5190 } 5191 5192 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 5193 struct dentry *dentry, char action, 5194 u32 seq) 5195 { 5196 struct ceph_client *cl = session->s_mdsc->fsc->client; 5197 struct ceph_msg *msg; 5198 struct ceph_mds_lease *lease; 5199 struct inode *dir; 5200 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX; 5201 5202 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action), 5203 session->s_mds); 5204 5205 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); 5206 if (!msg) 5207 return; 5208 lease = msg->front.iov_base; 5209 lease->action = action; 5210 lease->seq = cpu_to_le32(seq); 5211 5212 spin_lock(&dentry->d_lock); 5213 dir = d_inode(dentry->d_parent); 5214 lease->ino = cpu_to_le64(ceph_ino(dir)); 5215 lease->first = lease->last = cpu_to_le64(ceph_snap(dir)); 5216 5217 put_unaligned_le32(dentry->d_name.len, lease + 1); 5218 memcpy((void *)(lease + 1) + 4, 5219 dentry->d_name.name, dentry->d_name.len); 5220 spin_unlock(&dentry->d_lock); 5221 5222 ceph_con_send(&session->s_con, msg); 5223 } 5224 5225 /* 5226 * lock unlock the session, to wait ongoing session activities 5227 */ 5228 static void lock_unlock_session(struct ceph_mds_session *s) 5229 { 5230 mutex_lock(&s->s_mutex); 5231 mutex_unlock(&s->s_mutex); 5232 } 5233 5234 static void maybe_recover_session(struct ceph_mds_client *mdsc) 5235 { 5236 struct ceph_client *cl = mdsc->fsc->client; 5237 struct ceph_fs_client *fsc = mdsc->fsc; 5238 5239 if (!ceph_test_mount_opt(fsc, CLEANRECOVER)) 5240 return; 5241 5242 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED) 5243 return; 5244 5245 if (!READ_ONCE(fsc->blocklisted)) 5246 return; 5247 5248 pr_info_client(cl, "auto reconnect after blocklisted\n"); 5249 ceph_force_reconnect(fsc->sb); 5250 } 5251 5252 bool check_session_state(struct ceph_mds_session *s) 5253 { 5254 struct ceph_client *cl = s->s_mdsc->fsc->client; 5255 5256 switch (s->s_state) { 5257 case CEPH_MDS_SESSION_OPEN: 5258 if (s->s_ttl && time_after(jiffies, s->s_ttl)) { 5259 s->s_state = CEPH_MDS_SESSION_HUNG; 5260 pr_info_client(cl, "mds%d hung\n", s->s_mds); 5261 } 5262 break; 5263 case CEPH_MDS_SESSION_CLOSING: 5264 case CEPH_MDS_SESSION_NEW: 5265 case CEPH_MDS_SESSION_RESTARTING: 5266 case CEPH_MDS_SESSION_CLOSED: 5267 case CEPH_MDS_SESSION_REJECTED: 5268 return false; 5269 } 5270 5271 return true; 5272 } 5273 5274 /* 5275 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply, 5276 * then we need to retransmit that request. 5277 */ 5278 void inc_session_sequence(struct ceph_mds_session *s) 5279 { 5280 struct ceph_client *cl = s->s_mdsc->fsc->client; 5281 5282 lockdep_assert_held(&s->s_mutex); 5283 5284 s->s_seq++; 5285 5286 if (s->s_state == CEPH_MDS_SESSION_CLOSING) { 5287 int ret; 5288 5289 doutc(cl, "resending session close request for mds%d\n", s->s_mds); 5290 ret = request_close_session(s); 5291 if (ret < 0) 5292 pr_err_client(cl, "unable to close session to mds%d: %d\n", 5293 s->s_mds, ret); 5294 } 5295 } 5296 5297 /* 5298 * delayed work -- periodically trim expired leases, renew caps with mds. If 5299 * the @delay parameter is set to 0 or if it's more than 5 secs, the default 5300 * workqueue delay value of 5 secs will be used. 5301 */ 5302 static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay) 5303 { 5304 unsigned long max_delay = HZ * 5; 5305 5306 /* 5 secs default delay */ 5307 if (!delay || (delay > max_delay)) 5308 delay = max_delay; 5309 schedule_delayed_work(&mdsc->delayed_work, 5310 round_jiffies_relative(delay)); 5311 } 5312 5313 static void delayed_work(struct work_struct *work) 5314 { 5315 struct ceph_mds_client *mdsc = 5316 container_of(work, struct ceph_mds_client, delayed_work.work); 5317 unsigned long delay; 5318 int renew_interval; 5319 int renew_caps; 5320 int i; 5321 5322 doutc(mdsc->fsc->client, "mdsc delayed_work\n"); 5323 5324 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED) 5325 return; 5326 5327 mutex_lock(&mdsc->mutex); 5328 renew_interval = mdsc->mdsmap->m_session_timeout >> 2; 5329 renew_caps = time_after_eq(jiffies, HZ*renew_interval + 5330 mdsc->last_renew_caps); 5331 if (renew_caps) 5332 mdsc->last_renew_caps = jiffies; 5333 5334 for (i = 0; i < mdsc->max_sessions; i++) { 5335 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); 5336 if (!s) 5337 continue; 5338 5339 if (!check_session_state(s)) { 5340 ceph_put_mds_session(s); 5341 continue; 5342 } 5343 mutex_unlock(&mdsc->mutex); 5344 5345 mutex_lock(&s->s_mutex); 5346 if (renew_caps) 5347 send_renew_caps(mdsc, s); 5348 else 5349 ceph_con_keepalive(&s->s_con); 5350 if (s->s_state == CEPH_MDS_SESSION_OPEN || 5351 s->s_state == CEPH_MDS_SESSION_HUNG) 5352 ceph_send_cap_releases(mdsc, s); 5353 mutex_unlock(&s->s_mutex); 5354 ceph_put_mds_session(s); 5355 5356 mutex_lock(&mdsc->mutex); 5357 } 5358 mutex_unlock(&mdsc->mutex); 5359 5360 delay = ceph_check_delayed_caps(mdsc); 5361 5362 ceph_queue_cap_reclaim_work(mdsc); 5363 5364 ceph_trim_snapid_map(mdsc); 5365 5366 maybe_recover_session(mdsc); 5367 5368 schedule_delayed(mdsc, delay); 5369 } 5370 5371 int ceph_mdsc_init(struct ceph_fs_client *fsc) 5372 5373 { 5374 struct ceph_mds_client *mdsc; 5375 int err; 5376 5377 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); 5378 if (!mdsc) 5379 return -ENOMEM; 5380 mdsc->fsc = fsc; 5381 mutex_init(&mdsc->mutex); 5382 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); 5383 if (!mdsc->mdsmap) { 5384 err = -ENOMEM; 5385 goto err_mdsc; 5386 } 5387 5388 init_completion(&mdsc->safe_umount_waiters); 5389 spin_lock_init(&mdsc->stopping_lock); 5390 atomic_set(&mdsc->stopping_blockers, 0); 5391 init_completion(&mdsc->stopping_waiter); 5392 init_waitqueue_head(&mdsc->session_close_wq); 5393 INIT_LIST_HEAD(&mdsc->waiting_for_map); 5394 mdsc->quotarealms_inodes = RB_ROOT; 5395 mutex_init(&mdsc->quotarealms_inodes_mutex); 5396 init_rwsem(&mdsc->snap_rwsem); 5397 mdsc->snap_realms = RB_ROOT; 5398 INIT_LIST_HEAD(&mdsc->snap_empty); 5399 spin_lock_init(&mdsc->snap_empty_lock); 5400 mdsc->request_tree = RB_ROOT; 5401 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); 5402 mdsc->last_renew_caps = jiffies; 5403 INIT_LIST_HEAD(&mdsc->cap_delay_list); 5404 INIT_LIST_HEAD(&mdsc->cap_wait_list); 5405 spin_lock_init(&mdsc->cap_delay_lock); 5406 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list); 5407 INIT_LIST_HEAD(&mdsc->snap_flush_list); 5408 spin_lock_init(&mdsc->snap_flush_lock); 5409 mdsc->last_cap_flush_tid = 1; 5410 INIT_LIST_HEAD(&mdsc->cap_flush_list); 5411 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); 5412 spin_lock_init(&mdsc->cap_dirty_lock); 5413 init_waitqueue_head(&mdsc->cap_flushing_wq); 5414 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work); 5415 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work); 5416 err = ceph_metric_init(&mdsc->metric); 5417 if (err) 5418 goto err_mdsmap; 5419 5420 spin_lock_init(&mdsc->dentry_list_lock); 5421 INIT_LIST_HEAD(&mdsc->dentry_leases); 5422 INIT_LIST_HEAD(&mdsc->dentry_dir_leases); 5423 5424 ceph_caps_init(mdsc); 5425 ceph_adjust_caps_max_min(mdsc, fsc->mount_options); 5426 5427 spin_lock_init(&mdsc->snapid_map_lock); 5428 mdsc->snapid_map_tree = RB_ROOT; 5429 INIT_LIST_HEAD(&mdsc->snapid_map_lru); 5430 5431 init_rwsem(&mdsc->pool_perm_rwsem); 5432 mdsc->pool_perm_tree = RB_ROOT; 5433 5434 strscpy(mdsc->nodename, utsname()->nodename, 5435 sizeof(mdsc->nodename)); 5436 5437 fsc->mdsc = mdsc; 5438 return 0; 5439 5440 err_mdsmap: 5441 kfree(mdsc->mdsmap); 5442 err_mdsc: 5443 kfree(mdsc); 5444 return err; 5445 } 5446 5447 /* 5448 * Wait for safe replies on open mds requests. If we time out, drop 5449 * all requests from the tree to avoid dangling dentry refs. 5450 */ 5451 static void wait_requests(struct ceph_mds_client *mdsc) 5452 { 5453 struct ceph_client *cl = mdsc->fsc->client; 5454 struct ceph_options *opts = mdsc->fsc->client->options; 5455 struct ceph_mds_request *req; 5456 5457 mutex_lock(&mdsc->mutex); 5458 if (__get_oldest_req(mdsc)) { 5459 mutex_unlock(&mdsc->mutex); 5460 5461 doutc(cl, "waiting for requests\n"); 5462 wait_for_completion_timeout(&mdsc->safe_umount_waiters, 5463 ceph_timeout_jiffies(opts->mount_timeout)); 5464 5465 /* tear down remaining requests */ 5466 mutex_lock(&mdsc->mutex); 5467 while ((req = __get_oldest_req(mdsc))) { 5468 doutc(cl, "timed out on tid %llu\n", req->r_tid); 5469 list_del_init(&req->r_wait); 5470 __unregister_request(mdsc, req); 5471 } 5472 } 5473 mutex_unlock(&mdsc->mutex); 5474 doutc(cl, "done\n"); 5475 } 5476 5477 void send_flush_mdlog(struct ceph_mds_session *s) 5478 { 5479 struct ceph_client *cl = s->s_mdsc->fsc->client; 5480 struct ceph_msg *msg; 5481 5482 /* 5483 * Pre-luminous MDS crashes when it sees an unknown session request 5484 */ 5485 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS)) 5486 return; 5487 5488 mutex_lock(&s->s_mutex); 5489 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n", 5490 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq); 5491 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG, 5492 s->s_seq); 5493 if (!msg) { 5494 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n", 5495 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq); 5496 } else { 5497 ceph_con_send(&s->s_con, msg); 5498 } 5499 mutex_unlock(&s->s_mutex); 5500 } 5501 5502 /* 5503 * called before mount is ro, and before dentries are torn down. 5504 * (hmm, does this still race with new lookups?) 5505 */ 5506 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) 5507 { 5508 doutc(mdsc->fsc->client, "begin\n"); 5509 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN; 5510 5511 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true); 5512 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false); 5513 ceph_flush_dirty_caps(mdsc); 5514 wait_requests(mdsc); 5515 5516 /* 5517 * wait for reply handlers to drop their request refs and 5518 * their inode/dcache refs 5519 */ 5520 ceph_msgr_flush(); 5521 5522 ceph_cleanup_quotarealms_inodes(mdsc); 5523 doutc(mdsc->fsc->client, "done\n"); 5524 } 5525 5526 /* 5527 * flush the mdlog and wait for all write mds requests to flush. 5528 */ 5529 static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc, 5530 u64 want_tid) 5531 { 5532 struct ceph_client *cl = mdsc->fsc->client; 5533 struct ceph_mds_request *req = NULL, *nextreq; 5534 struct ceph_mds_session *last_session = NULL; 5535 struct rb_node *n; 5536 5537 mutex_lock(&mdsc->mutex); 5538 doutc(cl, "want %lld\n", want_tid); 5539 restart: 5540 req = __get_oldest_req(mdsc); 5541 while (req && req->r_tid <= want_tid) { 5542 /* find next request */ 5543 n = rb_next(&req->r_node); 5544 if (n) 5545 nextreq = rb_entry(n, struct ceph_mds_request, r_node); 5546 else 5547 nextreq = NULL; 5548 if (req->r_op != CEPH_MDS_OP_SETFILELOCK && 5549 (req->r_op & CEPH_MDS_OP_WRITE)) { 5550 struct ceph_mds_session *s = req->r_session; 5551 5552 if (!s) { 5553 req = nextreq; 5554 continue; 5555 } 5556 5557 /* write op */ 5558 ceph_mdsc_get_request(req); 5559 if (nextreq) 5560 ceph_mdsc_get_request(nextreq); 5561 s = ceph_get_mds_session(s); 5562 mutex_unlock(&mdsc->mutex); 5563 5564 /* send flush mdlog request to MDS */ 5565 if (last_session != s) { 5566 send_flush_mdlog(s); 5567 ceph_put_mds_session(last_session); 5568 last_session = s; 5569 } else { 5570 ceph_put_mds_session(s); 5571 } 5572 doutc(cl, "wait on %llu (want %llu)\n", 5573 req->r_tid, want_tid); 5574 wait_for_completion(&req->r_safe_completion); 5575 5576 mutex_lock(&mdsc->mutex); 5577 ceph_mdsc_put_request(req); 5578 if (!nextreq) 5579 break; /* next dne before, so we're done! */ 5580 if (RB_EMPTY_NODE(&nextreq->r_node)) { 5581 /* next request was removed from tree */ 5582 ceph_mdsc_put_request(nextreq); 5583 goto restart; 5584 } 5585 ceph_mdsc_put_request(nextreq); /* won't go away */ 5586 } 5587 req = nextreq; 5588 } 5589 mutex_unlock(&mdsc->mutex); 5590 ceph_put_mds_session(last_session); 5591 doutc(cl, "done\n"); 5592 } 5593 5594 void ceph_mdsc_sync(struct ceph_mds_client *mdsc) 5595 { 5596 struct ceph_client *cl = mdsc->fsc->client; 5597 u64 want_tid, want_flush; 5598 5599 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) 5600 return; 5601 5602 doutc(cl, "sync\n"); 5603 mutex_lock(&mdsc->mutex); 5604 want_tid = mdsc->last_tid; 5605 mutex_unlock(&mdsc->mutex); 5606 5607 ceph_flush_dirty_caps(mdsc); 5608 spin_lock(&mdsc->cap_dirty_lock); 5609 want_flush = mdsc->last_cap_flush_tid; 5610 if (!list_empty(&mdsc->cap_flush_list)) { 5611 struct ceph_cap_flush *cf = 5612 list_last_entry(&mdsc->cap_flush_list, 5613 struct ceph_cap_flush, g_list); 5614 cf->wake = true; 5615 } 5616 spin_unlock(&mdsc->cap_dirty_lock); 5617 5618 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush); 5619 5620 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid); 5621 wait_caps_flush(mdsc, want_flush); 5622 } 5623 5624 /* 5625 * true if all sessions are closed, or we force unmount 5626 */ 5627 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped) 5628 { 5629 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) 5630 return true; 5631 return atomic_read(&mdsc->num_sessions) <= skipped; 5632 } 5633 5634 /* 5635 * called after sb is ro or when metadata corrupted. 5636 */ 5637 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) 5638 { 5639 struct ceph_options *opts = mdsc->fsc->client->options; 5640 struct ceph_client *cl = mdsc->fsc->client; 5641 struct ceph_mds_session *session; 5642 int i; 5643 int skipped = 0; 5644 5645 doutc(cl, "begin\n"); 5646 5647 /* close sessions */ 5648 mutex_lock(&mdsc->mutex); 5649 for (i = 0; i < mdsc->max_sessions; i++) { 5650 session = __ceph_lookup_mds_session(mdsc, i); 5651 if (!session) 5652 continue; 5653 mutex_unlock(&mdsc->mutex); 5654 mutex_lock(&session->s_mutex); 5655 if (__close_session(mdsc, session) <= 0) 5656 skipped++; 5657 mutex_unlock(&session->s_mutex); 5658 ceph_put_mds_session(session); 5659 mutex_lock(&mdsc->mutex); 5660 } 5661 mutex_unlock(&mdsc->mutex); 5662 5663 doutc(cl, "waiting for sessions to close\n"); 5664 wait_event_timeout(mdsc->session_close_wq, 5665 done_closing_sessions(mdsc, skipped), 5666 ceph_timeout_jiffies(opts->mount_timeout)); 5667 5668 /* tear down remaining sessions */ 5669 mutex_lock(&mdsc->mutex); 5670 for (i = 0; i < mdsc->max_sessions; i++) { 5671 if (mdsc->sessions[i]) { 5672 session = ceph_get_mds_session(mdsc->sessions[i]); 5673 __unregister_session(mdsc, session); 5674 mutex_unlock(&mdsc->mutex); 5675 mutex_lock(&session->s_mutex); 5676 remove_session_caps(session); 5677 mutex_unlock(&session->s_mutex); 5678 ceph_put_mds_session(session); 5679 mutex_lock(&mdsc->mutex); 5680 } 5681 } 5682 WARN_ON(!list_empty(&mdsc->cap_delay_list)); 5683 mutex_unlock(&mdsc->mutex); 5684 5685 ceph_cleanup_snapid_map(mdsc); 5686 ceph_cleanup_global_and_empty_realms(mdsc); 5687 5688 cancel_work_sync(&mdsc->cap_reclaim_work); 5689 cancel_work_sync(&mdsc->cap_unlink_work); 5690 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ 5691 5692 doutc(cl, "done\n"); 5693 } 5694 5695 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) 5696 { 5697 struct ceph_mds_session *session; 5698 int mds; 5699 5700 doutc(mdsc->fsc->client, "force umount\n"); 5701 5702 mutex_lock(&mdsc->mutex); 5703 for (mds = 0; mds < mdsc->max_sessions; mds++) { 5704 session = __ceph_lookup_mds_session(mdsc, mds); 5705 if (!session) 5706 continue; 5707 5708 if (session->s_state == CEPH_MDS_SESSION_REJECTED) 5709 __unregister_session(mdsc, session); 5710 __wake_requests(mdsc, &session->s_waiting); 5711 mutex_unlock(&mdsc->mutex); 5712 5713 mutex_lock(&session->s_mutex); 5714 __close_session(mdsc, session); 5715 if (session->s_state == CEPH_MDS_SESSION_CLOSING) { 5716 cleanup_session_requests(mdsc, session); 5717 remove_session_caps(session); 5718 } 5719 mutex_unlock(&session->s_mutex); 5720 ceph_put_mds_session(session); 5721 5722 mutex_lock(&mdsc->mutex); 5723 kick_requests(mdsc, mds); 5724 } 5725 __wake_requests(mdsc, &mdsc->waiting_for_map); 5726 mutex_unlock(&mdsc->mutex); 5727 } 5728 5729 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) 5730 { 5731 doutc(mdsc->fsc->client, "stop\n"); 5732 /* 5733 * Make sure the delayed work stopped before releasing 5734 * the resources. 5735 * 5736 * Because the cancel_delayed_work_sync() will only 5737 * guarantee that the work finishes executing. But the 5738 * delayed work will re-arm itself again after that. 5739 */ 5740 flush_delayed_work(&mdsc->delayed_work); 5741 5742 if (mdsc->mdsmap) 5743 ceph_mdsmap_destroy(mdsc->mdsmap); 5744 kfree(mdsc->sessions); 5745 ceph_caps_finalize(mdsc); 5746 ceph_pool_perm_destroy(mdsc); 5747 } 5748 5749 void ceph_mdsc_destroy(struct ceph_fs_client *fsc) 5750 { 5751 struct ceph_mds_client *mdsc = fsc->mdsc; 5752 doutc(fsc->client, "%p\n", mdsc); 5753 5754 if (!mdsc) 5755 return; 5756 5757 /* flush out any connection work with references to us */ 5758 ceph_msgr_flush(); 5759 5760 ceph_mdsc_stop(mdsc); 5761 5762 ceph_metric_destroy(&mdsc->metric); 5763 5764 fsc->mdsc = NULL; 5765 kfree(mdsc); 5766 doutc(fsc->client, "%p done\n", mdsc); 5767 } 5768 5769 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) 5770 { 5771 struct ceph_fs_client *fsc = mdsc->fsc; 5772 struct ceph_client *cl = fsc->client; 5773 const char *mds_namespace = fsc->mount_options->mds_namespace; 5774 void *p = msg->front.iov_base; 5775 void *end = p + msg->front.iov_len; 5776 u32 epoch; 5777 u32 num_fs; 5778 u32 mount_fscid = (u32)-1; 5779 int err = -EINVAL; 5780 5781 ceph_decode_need(&p, end, sizeof(u32), bad); 5782 epoch = ceph_decode_32(&p); 5783 5784 doutc(cl, "epoch %u\n", epoch); 5785 5786 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */ 5787 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad); 5788 5789 ceph_decode_32_safe(&p, end, num_fs, bad); 5790 while (num_fs-- > 0) { 5791 void *info_p, *info_end; 5792 u32 info_len; 5793 u32 fscid, namelen; 5794 5795 ceph_decode_need(&p, end, 2 + sizeof(u32), bad); 5796 p += 2; // info_v, info_cv 5797 info_len = ceph_decode_32(&p); 5798 ceph_decode_need(&p, end, info_len, bad); 5799 info_p = p; 5800 info_end = p + info_len; 5801 p = info_end; 5802 5803 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad); 5804 fscid = ceph_decode_32(&info_p); 5805 namelen = ceph_decode_32(&info_p); 5806 ceph_decode_need(&info_p, info_end, namelen, bad); 5807 5808 if (mds_namespace && 5809 strlen(mds_namespace) == namelen && 5810 !strncmp(mds_namespace, (char *)info_p, namelen)) { 5811 mount_fscid = fscid; 5812 break; 5813 } 5814 } 5815 5816 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch); 5817 if (mount_fscid != (u32)-1) { 5818 fsc->client->monc.fs_cluster_id = mount_fscid; 5819 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 5820 0, true); 5821 ceph_monc_renew_subs(&fsc->client->monc); 5822 } else { 5823 err = -ENOENT; 5824 goto err_out; 5825 } 5826 return; 5827 5828 bad: 5829 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n", 5830 err); 5831 ceph_umount_begin(mdsc->fsc->sb); 5832 ceph_msg_dump(msg); 5833 err_out: 5834 mutex_lock(&mdsc->mutex); 5835 mdsc->mdsmap_err = err; 5836 __wake_requests(mdsc, &mdsc->waiting_for_map); 5837 mutex_unlock(&mdsc->mutex); 5838 } 5839 5840 /* 5841 * handle mds map update. 5842 */ 5843 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) 5844 { 5845 struct ceph_client *cl = mdsc->fsc->client; 5846 u32 epoch; 5847 u32 maplen; 5848 void *p = msg->front.iov_base; 5849 void *end = p + msg->front.iov_len; 5850 struct ceph_mdsmap *newmap, *oldmap; 5851 struct ceph_fsid fsid; 5852 int err = -EINVAL; 5853 5854 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); 5855 ceph_decode_copy(&p, &fsid, sizeof(fsid)); 5856 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) 5857 return; 5858 epoch = ceph_decode_32(&p); 5859 maplen = ceph_decode_32(&p); 5860 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen); 5861 5862 /* do we need it? */ 5863 mutex_lock(&mdsc->mutex); 5864 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { 5865 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch); 5866 mutex_unlock(&mdsc->mutex); 5867 return; 5868 } 5869 5870 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client)); 5871 if (IS_ERR(newmap)) { 5872 err = PTR_ERR(newmap); 5873 goto bad_unlock; 5874 } 5875 5876 /* swap into place */ 5877 if (mdsc->mdsmap) { 5878 oldmap = mdsc->mdsmap; 5879 mdsc->mdsmap = newmap; 5880 check_new_map(mdsc, newmap, oldmap); 5881 ceph_mdsmap_destroy(oldmap); 5882 } else { 5883 mdsc->mdsmap = newmap; /* first mds map */ 5884 } 5885 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size, 5886 MAX_LFS_FILESIZE); 5887 5888 __wake_requests(mdsc, &mdsc->waiting_for_map); 5889 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, 5890 mdsc->mdsmap->m_epoch); 5891 5892 mutex_unlock(&mdsc->mutex); 5893 schedule_delayed(mdsc, 0); 5894 return; 5895 5896 bad_unlock: 5897 mutex_unlock(&mdsc->mutex); 5898 bad: 5899 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n", 5900 err); 5901 ceph_umount_begin(mdsc->fsc->sb); 5902 ceph_msg_dump(msg); 5903 return; 5904 } 5905 5906 static struct ceph_connection *mds_get_con(struct ceph_connection *con) 5907 { 5908 struct ceph_mds_session *s = con->private; 5909 5910 if (ceph_get_mds_session(s)) 5911 return con; 5912 return NULL; 5913 } 5914 5915 static void mds_put_con(struct ceph_connection *con) 5916 { 5917 struct ceph_mds_session *s = con->private; 5918 5919 ceph_put_mds_session(s); 5920 } 5921 5922 /* 5923 * if the client is unresponsive for long enough, the mds will kill 5924 * the session entirely. 5925 */ 5926 static void mds_peer_reset(struct ceph_connection *con) 5927 { 5928 struct ceph_mds_session *s = con->private; 5929 struct ceph_mds_client *mdsc = s->s_mdsc; 5930 5931 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n", 5932 s->s_mds); 5933 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO && 5934 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT) 5935 send_mds_reconnect(mdsc, s); 5936 } 5937 5938 static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg) 5939 { 5940 struct ceph_mds_session *s = con->private; 5941 struct ceph_mds_client *mdsc = s->s_mdsc; 5942 struct ceph_client *cl = mdsc->fsc->client; 5943 int type = le16_to_cpu(msg->hdr.type); 5944 5945 mutex_lock(&mdsc->mutex); 5946 if (__verify_registered_session(mdsc, s) < 0) { 5947 mutex_unlock(&mdsc->mutex); 5948 goto out; 5949 } 5950 mutex_unlock(&mdsc->mutex); 5951 5952 switch (type) { 5953 case CEPH_MSG_MDS_MAP: 5954 ceph_mdsc_handle_mdsmap(mdsc, msg); 5955 break; 5956 case CEPH_MSG_FS_MAP_USER: 5957 ceph_mdsc_handle_fsmap(mdsc, msg); 5958 break; 5959 case CEPH_MSG_CLIENT_SESSION: 5960 handle_session(s, msg); 5961 break; 5962 case CEPH_MSG_CLIENT_REPLY: 5963 handle_reply(s, msg); 5964 break; 5965 case CEPH_MSG_CLIENT_REQUEST_FORWARD: 5966 handle_forward(mdsc, s, msg); 5967 break; 5968 case CEPH_MSG_CLIENT_CAPS: 5969 ceph_handle_caps(s, msg); 5970 break; 5971 case CEPH_MSG_CLIENT_SNAP: 5972 ceph_handle_snap(mdsc, s, msg); 5973 break; 5974 case CEPH_MSG_CLIENT_LEASE: 5975 handle_lease(mdsc, s, msg); 5976 break; 5977 case CEPH_MSG_CLIENT_QUOTA: 5978 ceph_handle_quota(mdsc, s, msg); 5979 break; 5980 5981 default: 5982 pr_err_client(cl, "received unknown message type %d %s\n", 5983 type, ceph_msg_type_name(type)); 5984 } 5985 out: 5986 ceph_msg_put(msg); 5987 } 5988 5989 /* 5990 * authentication 5991 */ 5992 5993 /* 5994 * Note: returned pointer is the address of a structure that's 5995 * managed separately. Caller must *not* attempt to free it. 5996 */ 5997 static struct ceph_auth_handshake * 5998 mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new) 5999 { 6000 struct ceph_mds_session *s = con->private; 6001 struct ceph_mds_client *mdsc = s->s_mdsc; 6002 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 6003 struct ceph_auth_handshake *auth = &s->s_auth; 6004 int ret; 6005 6006 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, 6007 force_new, proto, NULL, NULL); 6008 if (ret) 6009 return ERR_PTR(ret); 6010 6011 return auth; 6012 } 6013 6014 static int mds_add_authorizer_challenge(struct ceph_connection *con, 6015 void *challenge_buf, int challenge_buf_len) 6016 { 6017 struct ceph_mds_session *s = con->private; 6018 struct ceph_mds_client *mdsc = s->s_mdsc; 6019 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 6020 6021 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer, 6022 challenge_buf, challenge_buf_len); 6023 } 6024 6025 static int mds_verify_authorizer_reply(struct ceph_connection *con) 6026 { 6027 struct ceph_mds_session *s = con->private; 6028 struct ceph_mds_client *mdsc = s->s_mdsc; 6029 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 6030 struct ceph_auth_handshake *auth = &s->s_auth; 6031 6032 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer, 6033 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len, 6034 NULL, NULL, NULL, NULL); 6035 } 6036 6037 static int mds_invalidate_authorizer(struct ceph_connection *con) 6038 { 6039 struct ceph_mds_session *s = con->private; 6040 struct ceph_mds_client *mdsc = s->s_mdsc; 6041 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; 6042 6043 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); 6044 6045 return ceph_monc_validate_auth(&mdsc->fsc->client->monc); 6046 } 6047 6048 static int mds_get_auth_request(struct ceph_connection *con, 6049 void *buf, int *buf_len, 6050 void **authorizer, int *authorizer_len) 6051 { 6052 struct ceph_mds_session *s = con->private; 6053 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 6054 struct ceph_auth_handshake *auth = &s->s_auth; 6055 int ret; 6056 6057 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, 6058 buf, buf_len); 6059 if (ret) 6060 return ret; 6061 6062 *authorizer = auth->authorizer_buf; 6063 *authorizer_len = auth->authorizer_buf_len; 6064 return 0; 6065 } 6066 6067 static int mds_handle_auth_reply_more(struct ceph_connection *con, 6068 void *reply, int reply_len, 6069 void *buf, int *buf_len, 6070 void **authorizer, int *authorizer_len) 6071 { 6072 struct ceph_mds_session *s = con->private; 6073 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 6074 struct ceph_auth_handshake *auth = &s->s_auth; 6075 int ret; 6076 6077 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len, 6078 buf, buf_len); 6079 if (ret) 6080 return ret; 6081 6082 *authorizer = auth->authorizer_buf; 6083 *authorizer_len = auth->authorizer_buf_len; 6084 return 0; 6085 } 6086 6087 static int mds_handle_auth_done(struct ceph_connection *con, 6088 u64 global_id, void *reply, int reply_len, 6089 u8 *session_key, int *session_key_len, 6090 u8 *con_secret, int *con_secret_len) 6091 { 6092 struct ceph_mds_session *s = con->private; 6093 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; 6094 struct ceph_auth_handshake *auth = &s->s_auth; 6095 6096 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len, 6097 session_key, session_key_len, 6098 con_secret, con_secret_len); 6099 } 6100 6101 static int mds_handle_auth_bad_method(struct ceph_connection *con, 6102 int used_proto, int result, 6103 const int *allowed_protos, int proto_cnt, 6104 const int *allowed_modes, int mode_cnt) 6105 { 6106 struct ceph_mds_session *s = con->private; 6107 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc; 6108 int ret; 6109 6110 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS, 6111 used_proto, result, 6112 allowed_protos, proto_cnt, 6113 allowed_modes, mode_cnt)) { 6114 ret = ceph_monc_validate_auth(monc); 6115 if (ret) 6116 return ret; 6117 } 6118 6119 return -EACCES; 6120 } 6121 6122 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, 6123 struct ceph_msg_header *hdr, int *skip) 6124 { 6125 struct ceph_msg *msg; 6126 int type = (int) le16_to_cpu(hdr->type); 6127 int front_len = (int) le32_to_cpu(hdr->front_len); 6128 6129 if (con->in_msg) 6130 return con->in_msg; 6131 6132 *skip = 0; 6133 msg = ceph_msg_new(type, front_len, GFP_NOFS, false); 6134 if (!msg) { 6135 pr_err("unable to allocate msg type %d len %d\n", 6136 type, front_len); 6137 return NULL; 6138 } 6139 6140 return msg; 6141 } 6142 6143 static int mds_sign_message(struct ceph_msg *msg) 6144 { 6145 struct ceph_mds_session *s = msg->con->private; 6146 struct ceph_auth_handshake *auth = &s->s_auth; 6147 6148 return ceph_auth_sign_message(auth, msg); 6149 } 6150 6151 static int mds_check_message_signature(struct ceph_msg *msg) 6152 { 6153 struct ceph_mds_session *s = msg->con->private; 6154 struct ceph_auth_handshake *auth = &s->s_auth; 6155 6156 return ceph_auth_check_message_signature(auth, msg); 6157 } 6158 6159 static const struct ceph_connection_operations mds_con_ops = { 6160 .get = mds_get_con, 6161 .put = mds_put_con, 6162 .alloc_msg = mds_alloc_msg, 6163 .dispatch = mds_dispatch, 6164 .peer_reset = mds_peer_reset, 6165 .get_authorizer = mds_get_authorizer, 6166 .add_authorizer_challenge = mds_add_authorizer_challenge, 6167 .verify_authorizer_reply = mds_verify_authorizer_reply, 6168 .invalidate_authorizer = mds_invalidate_authorizer, 6169 .sign_message = mds_sign_message, 6170 .check_message_signature = mds_check_message_signature, 6171 .get_auth_request = mds_get_auth_request, 6172 .handle_auth_reply_more = mds_handle_auth_reply_more, 6173 .handle_auth_done = mds_handle_auth_done, 6174 .handle_auth_bad_method = mds_handle_auth_bad_method, 6175 }; 6176 6177 /* eof */ 6178