1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/fs.h> 5 #include <linux/kernel.h> 6 #include <linux/sched/signal.h> 7 #include <linux/slab.h> 8 #include <linux/vmalloc.h> 9 #include <linux/wait.h> 10 #include <linux/writeback.h> 11 #include <linux/iversion.h> 12 #include <linux/filelock.h> 13 #include <linux/jiffies.h> 14 15 #include "super.h" 16 #include "mds_client.h" 17 #include "cache.h" 18 #include "crypto.h" 19 #include <linux/ceph/decode.h> 20 #include <linux/ceph/messenger.h> 21 22 /* 23 * Capability management 24 * 25 * The Ceph metadata servers control client access to inode metadata 26 * and file data by issuing capabilities, granting clients permission 27 * to read and/or write both inode field and file data to OSDs 28 * (storage nodes). Each capability consists of a set of bits 29 * indicating which operations are allowed. 30 * 31 * If the client holds a *_SHARED cap, the client has a coherent value 32 * that can be safely read from the cached inode. 33 * 34 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the 35 * client is allowed to change inode attributes (e.g., file size, 36 * mtime), note its dirty state in the ceph_cap, and asynchronously 37 * flush that metadata change to the MDS. 38 * 39 * In the event of a conflicting operation (perhaps by another 40 * client), the MDS will revoke the conflicting client capabilities. 41 * 42 * In order for a client to cache an inode, it must hold a capability 43 * with at least one MDS server. When inodes are released, release 44 * notifications are batched and periodically sent en masse to the MDS 45 * cluster to release server state. 46 */ 47 48 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc); 49 static void __kick_flushing_caps(struct ceph_mds_client *mdsc, 50 struct ceph_mds_session *session, 51 struct ceph_inode_info *ci, 52 u64 oldest_flush_tid); 53 54 /* 55 * Generate readable cap strings for debugging output. 56 */ 57 #define MAX_CAP_STR 20 58 static char cap_str[MAX_CAP_STR][40]; 59 static DEFINE_SPINLOCK(cap_str_lock); 60 static int last_cap_str; 61 62 static char *gcap_string(char *s, int c) 63 { 64 if (c & CEPH_CAP_GSHARED) 65 *s++ = 's'; 66 if (c & CEPH_CAP_GEXCL) 67 *s++ = 'x'; 68 if (c & CEPH_CAP_GCACHE) 69 *s++ = 'c'; 70 if (c & CEPH_CAP_GRD) 71 *s++ = 'r'; 72 if (c & CEPH_CAP_GWR) 73 *s++ = 'w'; 74 if (c & CEPH_CAP_GBUFFER) 75 *s++ = 'b'; 76 if (c & CEPH_CAP_GWREXTEND) 77 *s++ = 'a'; 78 if (c & CEPH_CAP_GLAZYIO) 79 *s++ = 'l'; 80 return s; 81 } 82 83 const char *ceph_cap_string(int caps) 84 { 85 int i; 86 char *s; 87 int c; 88 89 spin_lock(&cap_str_lock); 90 i = last_cap_str++; 91 if (last_cap_str == MAX_CAP_STR) 92 last_cap_str = 0; 93 spin_unlock(&cap_str_lock); 94 95 s = cap_str[i]; 96 97 if (caps & CEPH_CAP_PIN) 98 *s++ = 'p'; 99 100 c = (caps >> CEPH_CAP_SAUTH) & 3; 101 if (c) { 102 *s++ = 'A'; 103 s = gcap_string(s, c); 104 } 105 106 c = (caps >> CEPH_CAP_SLINK) & 3; 107 if (c) { 108 *s++ = 'L'; 109 s = gcap_string(s, c); 110 } 111 112 c = (caps >> CEPH_CAP_SXATTR) & 3; 113 if (c) { 114 *s++ = 'X'; 115 s = gcap_string(s, c); 116 } 117 118 c = caps >> CEPH_CAP_SFILE; 119 if (c) { 120 *s++ = 'F'; 121 s = gcap_string(s, c); 122 } 123 124 if (s == cap_str[i]) 125 *s++ = '-'; 126 *s = 0; 127 return cap_str[i]; 128 } 129 130 void ceph_caps_init(struct ceph_mds_client *mdsc) 131 { 132 INIT_LIST_HEAD(&mdsc->caps_list); 133 spin_lock_init(&mdsc->caps_list_lock); 134 } 135 136 void ceph_caps_finalize(struct ceph_mds_client *mdsc) 137 { 138 struct ceph_cap *cap; 139 140 spin_lock(&mdsc->caps_list_lock); 141 while (!list_empty(&mdsc->caps_list)) { 142 cap = list_first_entry(&mdsc->caps_list, 143 struct ceph_cap, caps_item); 144 list_del(&cap->caps_item); 145 kmem_cache_free(ceph_cap_cachep, cap); 146 } 147 mdsc->caps_total_count = 0; 148 mdsc->caps_avail_count = 0; 149 mdsc->caps_use_count = 0; 150 mdsc->caps_reserve_count = 0; 151 mdsc->caps_min_count = 0; 152 spin_unlock(&mdsc->caps_list_lock); 153 } 154 155 void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc, 156 struct ceph_mount_options *fsopt) 157 { 158 spin_lock(&mdsc->caps_list_lock); 159 mdsc->caps_min_count = fsopt->max_readdir; 160 if (mdsc->caps_min_count < 1024) 161 mdsc->caps_min_count = 1024; 162 mdsc->caps_use_max = fsopt->caps_max; 163 if (mdsc->caps_use_max > 0 && 164 mdsc->caps_use_max < mdsc->caps_min_count) 165 mdsc->caps_use_max = mdsc->caps_min_count; 166 spin_unlock(&mdsc->caps_list_lock); 167 } 168 169 static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps) 170 { 171 struct ceph_cap *cap; 172 int i; 173 174 if (nr_caps) { 175 BUG_ON(mdsc->caps_reserve_count < nr_caps); 176 mdsc->caps_reserve_count -= nr_caps; 177 if (mdsc->caps_avail_count >= 178 mdsc->caps_reserve_count + mdsc->caps_min_count) { 179 mdsc->caps_total_count -= nr_caps; 180 for (i = 0; i < nr_caps; i++) { 181 cap = list_first_entry(&mdsc->caps_list, 182 struct ceph_cap, caps_item); 183 list_del(&cap->caps_item); 184 kmem_cache_free(ceph_cap_cachep, cap); 185 } 186 } else { 187 mdsc->caps_avail_count += nr_caps; 188 } 189 190 doutc(mdsc->fsc->client, 191 "caps %d = %d used + %d resv + %d avail\n", 192 mdsc->caps_total_count, mdsc->caps_use_count, 193 mdsc->caps_reserve_count, mdsc->caps_avail_count); 194 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 195 mdsc->caps_reserve_count + 196 mdsc->caps_avail_count); 197 } 198 } 199 200 /* 201 * Called under mdsc->mutex. 202 */ 203 int ceph_reserve_caps(struct ceph_mds_client *mdsc, 204 struct ceph_cap_reservation *ctx, int need) 205 { 206 struct ceph_client *cl = mdsc->fsc->client; 207 int i, j; 208 struct ceph_cap *cap; 209 int have; 210 int alloc = 0; 211 int max_caps; 212 int err = 0; 213 bool trimmed = false; 214 struct ceph_mds_session *s; 215 LIST_HEAD(newcaps); 216 217 doutc(cl, "ctx=%p need=%d\n", ctx, need); 218 219 /* first reserve any caps that are already allocated */ 220 spin_lock(&mdsc->caps_list_lock); 221 if (mdsc->caps_avail_count >= need) 222 have = need; 223 else 224 have = mdsc->caps_avail_count; 225 mdsc->caps_avail_count -= have; 226 mdsc->caps_reserve_count += have; 227 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 228 mdsc->caps_reserve_count + 229 mdsc->caps_avail_count); 230 spin_unlock(&mdsc->caps_list_lock); 231 232 for (i = have; i < need; ) { 233 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); 234 if (cap) { 235 list_add(&cap->caps_item, &newcaps); 236 alloc++; 237 i++; 238 continue; 239 } 240 241 if (!trimmed) { 242 for (j = 0; j < mdsc->max_sessions; j++) { 243 s = __ceph_lookup_mds_session(mdsc, j); 244 if (!s) 245 continue; 246 mutex_unlock(&mdsc->mutex); 247 248 mutex_lock(&s->s_mutex); 249 max_caps = s->s_nr_caps - (need - i); 250 ceph_trim_caps(mdsc, s, max_caps); 251 mutex_unlock(&s->s_mutex); 252 253 ceph_put_mds_session(s); 254 mutex_lock(&mdsc->mutex); 255 } 256 trimmed = true; 257 258 spin_lock(&mdsc->caps_list_lock); 259 if (mdsc->caps_avail_count) { 260 int more_have; 261 if (mdsc->caps_avail_count >= need - i) 262 more_have = need - i; 263 else 264 more_have = mdsc->caps_avail_count; 265 266 i += more_have; 267 have += more_have; 268 mdsc->caps_avail_count -= more_have; 269 mdsc->caps_reserve_count += more_have; 270 271 } 272 spin_unlock(&mdsc->caps_list_lock); 273 274 continue; 275 } 276 277 pr_warn_client(cl, "ctx=%p ENOMEM need=%d got=%d\n", ctx, need, 278 have + alloc); 279 err = -ENOMEM; 280 break; 281 } 282 283 if (!err) { 284 BUG_ON(have + alloc != need); 285 ctx->count = need; 286 ctx->used = 0; 287 } 288 289 spin_lock(&mdsc->caps_list_lock); 290 mdsc->caps_total_count += alloc; 291 mdsc->caps_reserve_count += alloc; 292 list_splice(&newcaps, &mdsc->caps_list); 293 294 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 295 mdsc->caps_reserve_count + 296 mdsc->caps_avail_count); 297 298 if (err) 299 __ceph_unreserve_caps(mdsc, have + alloc); 300 301 spin_unlock(&mdsc->caps_list_lock); 302 303 doutc(cl, "ctx=%p %d = %d used + %d resv + %d avail\n", ctx, 304 mdsc->caps_total_count, mdsc->caps_use_count, 305 mdsc->caps_reserve_count, mdsc->caps_avail_count); 306 return err; 307 } 308 309 void ceph_unreserve_caps(struct ceph_mds_client *mdsc, 310 struct ceph_cap_reservation *ctx) 311 { 312 struct ceph_client *cl = mdsc->fsc->client; 313 bool reclaim = false; 314 if (!ctx->count) 315 return; 316 317 doutc(cl, "ctx=%p count=%d\n", ctx, ctx->count); 318 spin_lock(&mdsc->caps_list_lock); 319 __ceph_unreserve_caps(mdsc, ctx->count); 320 ctx->count = 0; 321 322 if (mdsc->caps_use_max > 0 && 323 mdsc->caps_use_count > mdsc->caps_use_max) 324 reclaim = true; 325 spin_unlock(&mdsc->caps_list_lock); 326 327 if (reclaim) 328 ceph_reclaim_caps_nr(mdsc, ctx->used); 329 } 330 331 struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 332 struct ceph_cap_reservation *ctx) 333 { 334 struct ceph_client *cl = mdsc->fsc->client; 335 struct ceph_cap *cap = NULL; 336 337 /* temporary, until we do something about cap import/export */ 338 if (!ctx) { 339 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); 340 if (cap) { 341 spin_lock(&mdsc->caps_list_lock); 342 mdsc->caps_use_count++; 343 mdsc->caps_total_count++; 344 spin_unlock(&mdsc->caps_list_lock); 345 } else { 346 spin_lock(&mdsc->caps_list_lock); 347 if (mdsc->caps_avail_count) { 348 BUG_ON(list_empty(&mdsc->caps_list)); 349 350 mdsc->caps_avail_count--; 351 mdsc->caps_use_count++; 352 cap = list_first_entry(&mdsc->caps_list, 353 struct ceph_cap, caps_item); 354 list_del(&cap->caps_item); 355 356 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 357 mdsc->caps_reserve_count + mdsc->caps_avail_count); 358 } 359 spin_unlock(&mdsc->caps_list_lock); 360 } 361 362 return cap; 363 } 364 365 spin_lock(&mdsc->caps_list_lock); 366 doutc(cl, "ctx=%p (%d) %d = %d used + %d resv + %d avail\n", ctx, 367 ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, 368 mdsc->caps_reserve_count, mdsc->caps_avail_count); 369 BUG_ON(!ctx->count); 370 BUG_ON(ctx->count > mdsc->caps_reserve_count); 371 BUG_ON(list_empty(&mdsc->caps_list)); 372 373 ctx->count--; 374 ctx->used++; 375 mdsc->caps_reserve_count--; 376 mdsc->caps_use_count++; 377 378 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); 379 list_del(&cap->caps_item); 380 381 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 382 mdsc->caps_reserve_count + mdsc->caps_avail_count); 383 spin_unlock(&mdsc->caps_list_lock); 384 return cap; 385 } 386 387 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) 388 { 389 struct ceph_client *cl = mdsc->fsc->client; 390 391 spin_lock(&mdsc->caps_list_lock); 392 doutc(cl, "%p %d = %d used + %d resv + %d avail\n", cap, 393 mdsc->caps_total_count, mdsc->caps_use_count, 394 mdsc->caps_reserve_count, mdsc->caps_avail_count); 395 mdsc->caps_use_count--; 396 /* 397 * Keep some preallocated caps around (ceph_min_count), to 398 * avoid lots of free/alloc churn. 399 */ 400 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + 401 mdsc->caps_min_count) { 402 mdsc->caps_total_count--; 403 kmem_cache_free(ceph_cap_cachep, cap); 404 } else { 405 mdsc->caps_avail_count++; 406 list_add(&cap->caps_item, &mdsc->caps_list); 407 } 408 409 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 410 mdsc->caps_reserve_count + mdsc->caps_avail_count); 411 spin_unlock(&mdsc->caps_list_lock); 412 } 413 414 void ceph_reservation_status(struct ceph_fs_client *fsc, 415 int *total, int *avail, int *used, int *reserved, 416 int *min) 417 { 418 struct ceph_mds_client *mdsc = fsc->mdsc; 419 420 spin_lock(&mdsc->caps_list_lock); 421 422 if (total) 423 *total = mdsc->caps_total_count; 424 if (avail) 425 *avail = mdsc->caps_avail_count; 426 if (used) 427 *used = mdsc->caps_use_count; 428 if (reserved) 429 *reserved = mdsc->caps_reserve_count; 430 if (min) 431 *min = mdsc->caps_min_count; 432 433 spin_unlock(&mdsc->caps_list_lock); 434 } 435 436 /* 437 * Find ceph_cap for given mds, if any. 438 * 439 * Called with i_ceph_lock held. 440 */ 441 struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) 442 { 443 struct ceph_cap *cap; 444 struct rb_node *n = ci->i_caps.rb_node; 445 446 while (n) { 447 cap = rb_entry(n, struct ceph_cap, ci_node); 448 if (mds < cap->mds) 449 n = n->rb_left; 450 else if (mds > cap->mds) 451 n = n->rb_right; 452 else 453 return cap; 454 } 455 return NULL; 456 } 457 458 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) 459 { 460 struct ceph_cap *cap; 461 462 spin_lock(&ci->i_ceph_lock); 463 cap = __get_cap_for_mds(ci, mds); 464 spin_unlock(&ci->i_ceph_lock); 465 return cap; 466 } 467 468 /* 469 * Called under i_ceph_lock. 470 */ 471 static void __insert_cap_node(struct ceph_inode_info *ci, 472 struct ceph_cap *new) 473 { 474 struct rb_node **p = &ci->i_caps.rb_node; 475 struct rb_node *parent = NULL; 476 struct ceph_cap *cap = NULL; 477 478 while (*p) { 479 parent = *p; 480 cap = rb_entry(parent, struct ceph_cap, ci_node); 481 if (new->mds < cap->mds) 482 p = &(*p)->rb_left; 483 else if (new->mds > cap->mds) 484 p = &(*p)->rb_right; 485 else 486 BUG(); 487 } 488 489 rb_link_node(&new->ci_node, parent, p); 490 rb_insert_color(&new->ci_node, &ci->i_caps); 491 } 492 493 /* 494 * (re)set cap hold timeouts, which control the delayed release 495 * of unused caps back to the MDS. Should be called on cap use. 496 */ 497 static void __cap_set_timeouts(struct ceph_mds_client *mdsc, 498 struct ceph_inode_info *ci) 499 { 500 struct inode *inode = &ci->netfs.inode; 501 struct ceph_mount_options *opt = mdsc->fsc->mount_options; 502 503 ci->i_hold_caps_max = round_jiffies(jiffies + 504 opt->caps_wanted_delay_max * HZ); 505 doutc(mdsc->fsc->client, "%p %llx.%llx %lu\n", inode, 506 ceph_vinop(inode), ci->i_hold_caps_max - jiffies); 507 } 508 509 /* 510 * (Re)queue cap at the end of the delayed cap release list. 511 * 512 * If I_FLUSH is set, leave the inode at the front of the list. 513 * 514 * Caller holds i_ceph_lock 515 * -> we take mdsc->cap_delay_lock 516 */ 517 static void __cap_delay_requeue(struct ceph_mds_client *mdsc, 518 struct ceph_inode_info *ci) 519 { 520 struct inode *inode = &ci->netfs.inode; 521 522 doutc(mdsc->fsc->client, "%p %llx.%llx flags 0x%lx at %lu\n", 523 inode, ceph_vinop(inode), ci->i_ceph_flags, 524 ci->i_hold_caps_max); 525 if (!mdsc->stopping) { 526 spin_lock(&mdsc->cap_delay_lock); 527 if (!list_empty(&ci->i_cap_delay_list)) { 528 if (ci->i_ceph_flags & CEPH_I_FLUSH) 529 goto no_change; 530 list_del_init(&ci->i_cap_delay_list); 531 } 532 __cap_set_timeouts(mdsc, ci); 533 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); 534 no_change: 535 spin_unlock(&mdsc->cap_delay_lock); 536 } 537 } 538 539 /* 540 * Queue an inode for immediate writeback. Mark inode with I_FLUSH, 541 * indicating we should send a cap message to flush dirty metadata 542 * asap, and move to the front of the delayed cap list. 543 */ 544 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, 545 struct ceph_inode_info *ci) 546 { 547 struct inode *inode = &ci->netfs.inode; 548 549 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 550 spin_lock(&mdsc->cap_delay_lock); 551 ci->i_ceph_flags |= CEPH_I_FLUSH; 552 if (!list_empty(&ci->i_cap_delay_list)) 553 list_del_init(&ci->i_cap_delay_list); 554 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); 555 spin_unlock(&mdsc->cap_delay_lock); 556 } 557 558 /* 559 * Cancel delayed work on cap. 560 * 561 * Caller must hold i_ceph_lock. 562 */ 563 static void __cap_delay_cancel(struct ceph_mds_client *mdsc, 564 struct ceph_inode_info *ci) 565 { 566 struct inode *inode = &ci->netfs.inode; 567 568 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 569 if (list_empty(&ci->i_cap_delay_list)) 570 return; 571 spin_lock(&mdsc->cap_delay_lock); 572 list_del_init(&ci->i_cap_delay_list); 573 spin_unlock(&mdsc->cap_delay_lock); 574 } 575 576 /* Common issue checks for add_cap, handle_cap_grant. */ 577 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, 578 unsigned issued) 579 { 580 struct inode *inode = &ci->netfs.inode; 581 struct ceph_client *cl = ceph_inode_to_client(inode); 582 583 unsigned had = __ceph_caps_issued(ci, NULL); 584 585 lockdep_assert_held(&ci->i_ceph_lock); 586 587 /* 588 * Each time we receive FILE_CACHE anew, we increment 589 * i_rdcache_gen. 590 */ 591 if (S_ISREG(ci->netfs.inode.i_mode) && 592 (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && 593 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) { 594 ci->i_rdcache_gen++; 595 } 596 597 /* 598 * If FILE_SHARED is newly issued, mark dir not complete. We don't 599 * know what happened to this directory while we didn't have the cap. 600 * If FILE_SHARED is being revoked, also mark dir not complete. It 601 * stops on-going cached readdir. 602 */ 603 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) { 604 if (issued & CEPH_CAP_FILE_SHARED) 605 atomic_inc(&ci->i_shared_gen); 606 if (S_ISDIR(ci->netfs.inode.i_mode)) { 607 doutc(cl, " marking %p NOT complete\n", inode); 608 __ceph_dir_clear_complete(ci); 609 } 610 } 611 612 /* Wipe saved layout if we're losing DIR_CREATE caps */ 613 if (S_ISDIR(ci->netfs.inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) && 614 !(issued & CEPH_CAP_DIR_CREATE)) { 615 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); 616 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); 617 } 618 } 619 620 /** 621 * change_auth_cap_ses - move inode to appropriate lists when auth caps change 622 * @ci: inode to be moved 623 * @session: new auth caps session 624 */ 625 void change_auth_cap_ses(struct ceph_inode_info *ci, 626 struct ceph_mds_session *session) 627 { 628 lockdep_assert_held(&ci->i_ceph_lock); 629 630 if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item)) 631 return; 632 633 spin_lock(&session->s_mdsc->cap_dirty_lock); 634 if (!list_empty(&ci->i_dirty_item)) 635 list_move(&ci->i_dirty_item, &session->s_cap_dirty); 636 if (!list_empty(&ci->i_flushing_item)) 637 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); 638 spin_unlock(&session->s_mdsc->cap_dirty_lock); 639 } 640 641 /* 642 * Add a capability under the given MDS session. 643 * 644 * Caller should hold session snap_rwsem (read) and ci->i_ceph_lock 645 * 646 * @fmode is the open file mode, if we are opening a file, otherwise 647 * it is < 0. (This is so we can atomically add the cap and add an 648 * open file reference to it.) 649 */ 650 void ceph_add_cap(struct inode *inode, 651 struct ceph_mds_session *session, u64 cap_id, 652 unsigned issued, unsigned wanted, 653 unsigned seq, unsigned mseq, u64 realmino, int flags, 654 struct ceph_cap **new_cap) 655 { 656 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc; 657 struct ceph_client *cl = ceph_inode_to_client(inode); 658 struct ceph_inode_info *ci = ceph_inode(inode); 659 struct ceph_cap *cap; 660 int mds = session->s_mds; 661 int actual_wanted; 662 u32 gen; 663 664 lockdep_assert_held(&ci->i_ceph_lock); 665 666 doutc(cl, "%p %llx.%llx mds%d cap %llx %s seq %d\n", inode, 667 ceph_vinop(inode), session->s_mds, cap_id, 668 ceph_cap_string(issued), seq); 669 670 gen = atomic_read(&session->s_cap_gen); 671 672 cap = __get_cap_for_mds(ci, mds); 673 if (!cap) { 674 cap = *new_cap; 675 *new_cap = NULL; 676 677 cap->issued = 0; 678 cap->implemented = 0; 679 cap->mds = mds; 680 cap->mds_wanted = 0; 681 cap->mseq = 0; 682 683 cap->ci = ci; 684 __insert_cap_node(ci, cap); 685 686 /* add to session cap list */ 687 cap->session = session; 688 spin_lock(&session->s_cap_lock); 689 list_add_tail(&cap->session_caps, &session->s_caps); 690 session->s_nr_caps++; 691 atomic64_inc(&mdsc->metric.total_caps); 692 spin_unlock(&session->s_cap_lock); 693 } else { 694 spin_lock(&session->s_cap_lock); 695 list_move_tail(&cap->session_caps, &session->s_caps); 696 spin_unlock(&session->s_cap_lock); 697 698 if (cap->cap_gen < gen) 699 cap->issued = cap->implemented = CEPH_CAP_PIN; 700 701 /* 702 * auth mds of the inode changed. we received the cap export 703 * message, but still haven't received the cap import message. 704 * handle_cap_export() updated the new auth MDS' cap. 705 * 706 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing 707 * a message that was send before the cap import message. So 708 * don't remove caps. 709 */ 710 if (ceph_seq_cmp(seq, cap->seq) <= 0) { 711 WARN_ON(cap != ci->i_auth_cap); 712 WARN_ON(cap->cap_id != cap_id); 713 seq = cap->seq; 714 mseq = cap->mseq; 715 issued |= cap->issued; 716 flags |= CEPH_CAP_FLAG_AUTH; 717 } 718 } 719 720 if (!ci->i_snap_realm || 721 ((flags & CEPH_CAP_FLAG_AUTH) && 722 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) { 723 /* 724 * add this inode to the appropriate snap realm 725 */ 726 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, 727 realmino); 728 if (realm) 729 ceph_change_snap_realm(inode, realm); 730 else 731 WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n", 732 __func__, realmino, ci->i_vino.ino, 733 ci->i_snap_realm ? ci->i_snap_realm->ino : 0); 734 } 735 736 __check_cap_issue(ci, cap, issued); 737 738 /* 739 * If we are issued caps we don't want, or the mds' wanted 740 * value appears to be off, queue a check so we'll release 741 * later and/or update the mds wanted value. 742 */ 743 actual_wanted = __ceph_caps_wanted(ci); 744 if ((wanted & ~actual_wanted) || 745 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { 746 doutc(cl, "issued %s, mds wanted %s, actual %s, queueing\n", 747 ceph_cap_string(issued), ceph_cap_string(wanted), 748 ceph_cap_string(actual_wanted)); 749 __cap_delay_requeue(mdsc, ci); 750 } 751 752 if (flags & CEPH_CAP_FLAG_AUTH) { 753 if (!ci->i_auth_cap || 754 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) { 755 if (ci->i_auth_cap && 756 ci->i_auth_cap->session != cap->session) 757 change_auth_cap_ses(ci, cap->session); 758 ci->i_auth_cap = cap; 759 cap->mds_wanted = wanted; 760 } 761 } else { 762 WARN_ON(ci->i_auth_cap == cap); 763 } 764 765 doutc(cl, "inode %p %llx.%llx cap %p %s now %s seq %d mds%d\n", 766 inode, ceph_vinop(inode), cap, ceph_cap_string(issued), 767 ceph_cap_string(issued|cap->issued), seq, mds); 768 cap->cap_id = cap_id; 769 cap->issued = issued; 770 cap->implemented |= issued; 771 if (ceph_seq_cmp(mseq, cap->mseq) > 0) 772 cap->mds_wanted = wanted; 773 else 774 cap->mds_wanted |= wanted; 775 cap->seq = seq; 776 cap->issue_seq = seq; 777 cap->mseq = mseq; 778 cap->cap_gen = gen; 779 wake_up_all(&ci->i_cap_wq); 780 } 781 782 /* 783 * Return true if cap has not timed out and belongs to the current 784 * generation of the MDS session (i.e. has not gone 'stale' due to 785 * us losing touch with the mds). 786 */ 787 static int __cap_is_valid(struct ceph_cap *cap) 788 { 789 struct inode *inode = &cap->ci->netfs.inode; 790 struct ceph_client *cl = cap->session->s_mdsc->fsc->client; 791 unsigned long ttl; 792 u32 gen; 793 794 gen = atomic_read(&cap->session->s_cap_gen); 795 ttl = cap->session->s_cap_ttl; 796 797 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { 798 doutc(cl, "%p %llx.%llx cap %p issued %s but STALE (gen %u vs %u)\n", 799 inode, ceph_vinop(inode), cap, 800 ceph_cap_string(cap->issued), cap->cap_gen, gen); 801 return 0; 802 } 803 804 return 1; 805 } 806 807 /* 808 * Return set of valid cap bits issued to us. Note that caps time 809 * out, and may be invalidated in bulk if the client session times out 810 * and session->s_cap_gen is bumped. 811 */ 812 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) 813 { 814 struct inode *inode = &ci->netfs.inode; 815 struct ceph_client *cl = ceph_inode_to_client(inode); 816 int have = ci->i_snap_caps; 817 struct ceph_cap *cap; 818 struct rb_node *p; 819 820 if (implemented) 821 *implemented = 0; 822 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 823 cap = rb_entry(p, struct ceph_cap, ci_node); 824 if (!__cap_is_valid(cap)) 825 continue; 826 doutc(cl, "%p %llx.%llx cap %p issued %s\n", inode, 827 ceph_vinop(inode), cap, ceph_cap_string(cap->issued)); 828 have |= cap->issued; 829 if (implemented) 830 *implemented |= cap->implemented; 831 } 832 /* 833 * exclude caps issued by non-auth MDS, but are been revoking 834 * by the auth MDS. The non-auth MDS should be revoking/exporting 835 * these caps, but the message is delayed. 836 */ 837 if (ci->i_auth_cap) { 838 cap = ci->i_auth_cap; 839 have &= ~cap->implemented | cap->issued; 840 } 841 return have; 842 } 843 844 /* 845 * Get cap bits issued by caps other than @ocap 846 */ 847 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) 848 { 849 int have = ci->i_snap_caps; 850 struct ceph_cap *cap; 851 struct rb_node *p; 852 853 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 854 cap = rb_entry(p, struct ceph_cap, ci_node); 855 if (cap == ocap) 856 continue; 857 if (!__cap_is_valid(cap)) 858 continue; 859 have |= cap->issued; 860 } 861 return have; 862 } 863 864 /* 865 * Move a cap to the end of the LRU (oldest caps at list head, newest 866 * at list tail). 867 */ 868 static void __touch_cap(struct ceph_cap *cap) 869 { 870 struct inode *inode = &cap->ci->netfs.inode; 871 struct ceph_mds_session *s = cap->session; 872 struct ceph_client *cl = s->s_mdsc->fsc->client; 873 874 spin_lock(&s->s_cap_lock); 875 if (!s->s_cap_iterator) { 876 doutc(cl, "%p %llx.%llx cap %p mds%d\n", inode, 877 ceph_vinop(inode), cap, s->s_mds); 878 list_move_tail(&cap->session_caps, &s->s_caps); 879 } else { 880 doutc(cl, "%p %llx.%llx cap %p mds%d NOP, iterating over caps\n", 881 inode, ceph_vinop(inode), cap, s->s_mds); 882 } 883 spin_unlock(&s->s_cap_lock); 884 } 885 886 /* 887 * Check if we hold the given mask. If so, move the cap(s) to the 888 * front of their respective LRUs. (This is the preferred way for 889 * callers to check for caps they want.) 890 */ 891 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) 892 { 893 struct inode *inode = &ci->netfs.inode; 894 struct ceph_client *cl = ceph_inode_to_client(inode); 895 struct ceph_cap *cap; 896 struct rb_node *p; 897 int have = ci->i_snap_caps; 898 899 if ((have & mask) == mask) { 900 doutc(cl, "mask %p %llx.%llx snap issued %s (mask %s)\n", 901 inode, ceph_vinop(inode), ceph_cap_string(have), 902 ceph_cap_string(mask)); 903 return 1; 904 } 905 906 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 907 cap = rb_entry(p, struct ceph_cap, ci_node); 908 if (!__cap_is_valid(cap)) 909 continue; 910 if ((cap->issued & mask) == mask) { 911 doutc(cl, "mask %p %llx.%llx cap %p issued %s (mask %s)\n", 912 inode, ceph_vinop(inode), cap, 913 ceph_cap_string(cap->issued), 914 ceph_cap_string(mask)); 915 if (touch) 916 __touch_cap(cap); 917 return 1; 918 } 919 920 /* does a combination of caps satisfy mask? */ 921 have |= cap->issued; 922 if ((have & mask) == mask) { 923 doutc(cl, "mask %p %llx.%llx combo issued %s (mask %s)\n", 924 inode, ceph_vinop(inode), 925 ceph_cap_string(cap->issued), 926 ceph_cap_string(mask)); 927 if (touch) { 928 struct rb_node *q; 929 930 /* touch this + preceding caps */ 931 __touch_cap(cap); 932 for (q = rb_first(&ci->i_caps); q != p; 933 q = rb_next(q)) { 934 cap = rb_entry(q, struct ceph_cap, 935 ci_node); 936 if (!__cap_is_valid(cap)) 937 continue; 938 if (cap->issued & mask) 939 __touch_cap(cap); 940 } 941 } 942 return 1; 943 } 944 } 945 946 return 0; 947 } 948 949 int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask, 950 int touch) 951 { 952 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb); 953 int r; 954 955 r = __ceph_caps_issued_mask(ci, mask, touch); 956 if (r) 957 ceph_update_cap_hit(&fsc->mdsc->metric); 958 else 959 ceph_update_cap_mis(&fsc->mdsc->metric); 960 return r; 961 } 962 963 /* 964 * Return true if mask caps are currently being revoked by an MDS. 965 */ 966 int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 967 struct ceph_cap *ocap, int mask) 968 { 969 struct ceph_cap *cap; 970 struct rb_node *p; 971 972 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 973 cap = rb_entry(p, struct ceph_cap, ci_node); 974 if (cap != ocap && 975 (cap->implemented & ~cap->issued & mask)) 976 return 1; 977 } 978 return 0; 979 } 980 981 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) 982 { 983 struct inode *inode = &ci->netfs.inode; 984 struct ceph_client *cl = ceph_inode_to_client(inode); 985 int ret; 986 987 spin_lock(&ci->i_ceph_lock); 988 ret = __ceph_caps_revoking_other(ci, NULL, mask); 989 spin_unlock(&ci->i_ceph_lock); 990 doutc(cl, "%p %llx.%llx %s = %d\n", inode, ceph_vinop(inode), 991 ceph_cap_string(mask), ret); 992 return ret; 993 } 994 995 int __ceph_caps_used(struct ceph_inode_info *ci) 996 { 997 int used = 0; 998 if (ci->i_pin_ref) 999 used |= CEPH_CAP_PIN; 1000 if (ci->i_rd_ref) 1001 used |= CEPH_CAP_FILE_RD; 1002 if (ci->i_rdcache_ref || 1003 (S_ISREG(ci->netfs.inode.i_mode) && 1004 ci->netfs.inode.i_data.nrpages)) 1005 used |= CEPH_CAP_FILE_CACHE; 1006 if (ci->i_wr_ref) 1007 used |= CEPH_CAP_FILE_WR; 1008 if (ci->i_wb_ref || ci->i_wrbuffer_ref) 1009 used |= CEPH_CAP_FILE_BUFFER; 1010 if (ci->i_fx_ref) 1011 used |= CEPH_CAP_FILE_EXCL; 1012 return used; 1013 } 1014 1015 #define FMODE_WAIT_BIAS 1000 1016 1017 /* 1018 * wanted, by virtue of open file modes 1019 */ 1020 int __ceph_caps_file_wanted(struct ceph_inode_info *ci) 1021 { 1022 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN); 1023 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD); 1024 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR); 1025 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY); 1026 struct ceph_mount_options *opt = 1027 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options; 1028 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ; 1029 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ; 1030 1031 if (S_ISDIR(ci->netfs.inode.i_mode)) { 1032 int want = 0; 1033 1034 /* use used_cutoff here, to keep dir's wanted caps longer */ 1035 if (ci->i_nr_by_mode[RD_SHIFT] > 0 || 1036 time_after(ci->i_last_rd, used_cutoff)) 1037 want |= CEPH_CAP_ANY_SHARED; 1038 1039 if (ci->i_nr_by_mode[WR_SHIFT] > 0 || 1040 time_after(ci->i_last_wr, used_cutoff)) { 1041 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL; 1042 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS) 1043 want |= CEPH_CAP_ANY_DIR_OPS; 1044 } 1045 1046 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0) 1047 want |= CEPH_CAP_PIN; 1048 1049 return want; 1050 } else { 1051 int bits = 0; 1052 1053 if (ci->i_nr_by_mode[RD_SHIFT] > 0) { 1054 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS || 1055 time_after(ci->i_last_rd, used_cutoff)) 1056 bits |= 1 << RD_SHIFT; 1057 } else if (time_after(ci->i_last_rd, idle_cutoff)) { 1058 bits |= 1 << RD_SHIFT; 1059 } 1060 1061 if (ci->i_nr_by_mode[WR_SHIFT] > 0) { 1062 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS || 1063 time_after(ci->i_last_wr, used_cutoff)) 1064 bits |= 1 << WR_SHIFT; 1065 } else if (time_after(ci->i_last_wr, idle_cutoff)) { 1066 bits |= 1 << WR_SHIFT; 1067 } 1068 1069 /* check lazyio only when read/write is wanted */ 1070 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) && 1071 ci->i_nr_by_mode[LAZY_SHIFT] > 0) 1072 bits |= 1 << LAZY_SHIFT; 1073 1074 return bits ? ceph_caps_for_mode(bits >> 1) : 0; 1075 } 1076 } 1077 1078 /* 1079 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 1080 */ 1081 int __ceph_caps_wanted(struct ceph_inode_info *ci) 1082 { 1083 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 1084 if (S_ISDIR(ci->netfs.inode.i_mode)) { 1085 /* we want EXCL if holding caps of dir ops */ 1086 if (w & CEPH_CAP_ANY_DIR_OPS) 1087 w |= CEPH_CAP_FILE_EXCL; 1088 } else { 1089 /* we want EXCL if dirty data */ 1090 if (w & CEPH_CAP_FILE_BUFFER) 1091 w |= CEPH_CAP_FILE_EXCL; 1092 } 1093 return w; 1094 } 1095 1096 /* 1097 * Return caps we have registered with the MDS(s) as 'wanted'. 1098 */ 1099 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check) 1100 { 1101 struct ceph_cap *cap; 1102 struct rb_node *p; 1103 int mds_wanted = 0; 1104 1105 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 1106 cap = rb_entry(p, struct ceph_cap, ci_node); 1107 if (check && !__cap_is_valid(cap)) 1108 continue; 1109 if (cap == ci->i_auth_cap) 1110 mds_wanted |= cap->mds_wanted; 1111 else 1112 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR); 1113 } 1114 return mds_wanted; 1115 } 1116 1117 int ceph_is_any_caps(struct inode *inode) 1118 { 1119 struct ceph_inode_info *ci = ceph_inode(inode); 1120 int ret; 1121 1122 spin_lock(&ci->i_ceph_lock); 1123 ret = __ceph_is_any_real_caps(ci); 1124 spin_unlock(&ci->i_ceph_lock); 1125 1126 return ret; 1127 } 1128 1129 /* 1130 * Remove a cap. Take steps to deal with a racing iterate_session_caps. 1131 * 1132 * caller should hold i_ceph_lock. 1133 * caller will not hold session s_mutex if called from destroy_inode. 1134 */ 1135 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release) 1136 { 1137 struct ceph_mds_session *session = cap->session; 1138 struct ceph_client *cl = session->s_mdsc->fsc->client; 1139 struct ceph_inode_info *ci = cap->ci; 1140 struct inode *inode = &ci->netfs.inode; 1141 struct ceph_mds_client *mdsc; 1142 int removed = 0; 1143 1144 /* 'ci' being NULL means the remove have already occurred */ 1145 if (!ci) { 1146 doutc(cl, "inode is NULL\n"); 1147 return; 1148 } 1149 1150 lockdep_assert_held(&ci->i_ceph_lock); 1151 1152 doutc(cl, "%p from %p %llx.%llx\n", cap, inode, ceph_vinop(inode)); 1153 1154 mdsc = ceph_inode_to_fs_client(&ci->netfs.inode)->mdsc; 1155 1156 /* remove from inode's cap rbtree, and clear auth cap */ 1157 rb_erase(&cap->ci_node, &ci->i_caps); 1158 if (ci->i_auth_cap == cap) 1159 ci->i_auth_cap = NULL; 1160 1161 /* remove from session list */ 1162 spin_lock(&session->s_cap_lock); 1163 if (session->s_cap_iterator == cap) { 1164 /* not yet, we are iterating over this very cap */ 1165 doutc(cl, "delaying %p removal from session %p\n", cap, 1166 cap->session); 1167 } else { 1168 list_del_init(&cap->session_caps); 1169 session->s_nr_caps--; 1170 atomic64_dec(&mdsc->metric.total_caps); 1171 cap->session = NULL; 1172 removed = 1; 1173 } 1174 /* protect backpointer with s_cap_lock: see iterate_session_caps */ 1175 cap->ci = NULL; 1176 1177 /* 1178 * s_cap_reconnect is protected by s_cap_lock. no one changes 1179 * s_cap_gen while session is in the reconnect state. 1180 */ 1181 if (queue_release && 1182 (!session->s_cap_reconnect || 1183 cap->cap_gen == atomic_read(&session->s_cap_gen))) { 1184 cap->queue_release = 1; 1185 if (removed) { 1186 __ceph_queue_cap_release(session, cap); 1187 removed = 0; 1188 } 1189 } else { 1190 cap->queue_release = 0; 1191 } 1192 cap->cap_ino = ci->i_vino.ino; 1193 1194 spin_unlock(&session->s_cap_lock); 1195 1196 if (removed) 1197 ceph_put_cap(mdsc, cap); 1198 1199 if (!__ceph_is_any_real_caps(ci)) { 1200 /* when reconnect denied, we remove session caps forcibly, 1201 * i_wr_ref can be non-zero. If there are ongoing write, 1202 * keep i_snap_realm. 1203 */ 1204 if (ci->i_wr_ref == 0 && ci->i_snap_realm) 1205 ceph_change_snap_realm(&ci->netfs.inode, NULL); 1206 1207 __cap_delay_cancel(mdsc, ci); 1208 } 1209 } 1210 1211 void ceph_remove_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap, 1212 bool queue_release) 1213 { 1214 struct ceph_inode_info *ci = cap->ci; 1215 struct ceph_fs_client *fsc; 1216 1217 /* 'ci' being NULL means the remove have already occurred */ 1218 if (!ci) { 1219 doutc(mdsc->fsc->client, "inode is NULL\n"); 1220 return; 1221 } 1222 1223 lockdep_assert_held(&ci->i_ceph_lock); 1224 1225 fsc = ceph_inode_to_fs_client(&ci->netfs.inode); 1226 WARN_ON_ONCE(ci->i_auth_cap == cap && 1227 !list_empty(&ci->i_dirty_item) && 1228 !fsc->blocklisted && 1229 !ceph_inode_is_shutdown(&ci->netfs.inode)); 1230 1231 __ceph_remove_cap(cap, queue_release); 1232 } 1233 1234 struct cap_msg_args { 1235 struct ceph_mds_session *session; 1236 u64 ino, cid, follows; 1237 u64 flush_tid, oldest_flush_tid, size, max_size; 1238 u64 xattr_version; 1239 u64 change_attr; 1240 struct ceph_buffer *xattr_buf; 1241 struct ceph_buffer *old_xattr_buf; 1242 struct timespec64 atime, mtime, ctime, btime; 1243 int op, caps, wanted, dirty; 1244 u32 seq, issue_seq, mseq, time_warp_seq; 1245 u32 flags; 1246 kuid_t uid; 1247 kgid_t gid; 1248 umode_t mode; 1249 bool inline_data; 1250 bool wake; 1251 bool encrypted; 1252 u32 fscrypt_auth_len; 1253 u8 fscrypt_auth[sizeof(struct ceph_fscrypt_auth)]; // for context 1254 }; 1255 1256 /* Marshal up the cap msg to the MDS */ 1257 static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg) 1258 { 1259 struct ceph_mds_caps *fc; 1260 void *p; 1261 struct ceph_mds_client *mdsc = arg->session->s_mdsc; 1262 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; 1263 1264 doutc(mdsc->fsc->client, 1265 "%s %llx %llx caps %s wanted %s dirty %s seq %u/%u" 1266 " tid %llu/%llu mseq %u follows %lld size %llu/%llu" 1267 " xattr_ver %llu xattr_len %d\n", 1268 ceph_cap_op_name(arg->op), arg->cid, arg->ino, 1269 ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted), 1270 ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq, 1271 arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows, 1272 arg->size, arg->max_size, arg->xattr_version, 1273 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0); 1274 1275 msg->hdr.version = cpu_to_le16(12); 1276 msg->hdr.tid = cpu_to_le64(arg->flush_tid); 1277 1278 fc = msg->front.iov_base; 1279 memset(fc, 0, sizeof(*fc)); 1280 1281 fc->cap_id = cpu_to_le64(arg->cid); 1282 fc->op = cpu_to_le32(arg->op); 1283 fc->seq = cpu_to_le32(arg->seq); 1284 fc->issue_seq = cpu_to_le32(arg->issue_seq); 1285 fc->migrate_seq = cpu_to_le32(arg->mseq); 1286 fc->caps = cpu_to_le32(arg->caps); 1287 fc->wanted = cpu_to_le32(arg->wanted); 1288 fc->dirty = cpu_to_le32(arg->dirty); 1289 fc->ino = cpu_to_le64(arg->ino); 1290 fc->snap_follows = cpu_to_le64(arg->follows); 1291 1292 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 1293 if (arg->encrypted) 1294 fc->size = cpu_to_le64(round_up(arg->size, 1295 CEPH_FSCRYPT_BLOCK_SIZE)); 1296 else 1297 #endif 1298 fc->size = cpu_to_le64(arg->size); 1299 fc->max_size = cpu_to_le64(arg->max_size); 1300 ceph_encode_timespec64(&fc->mtime, &arg->mtime); 1301 ceph_encode_timespec64(&fc->atime, &arg->atime); 1302 ceph_encode_timespec64(&fc->ctime, &arg->ctime); 1303 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq); 1304 1305 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid)); 1306 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid)); 1307 fc->mode = cpu_to_le32(arg->mode); 1308 1309 fc->xattr_version = cpu_to_le64(arg->xattr_version); 1310 if (arg->xattr_buf) { 1311 msg->middle = ceph_buffer_get(arg->xattr_buf); 1312 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len); 1313 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len); 1314 } 1315 1316 p = fc + 1; 1317 /* flock buffer size (version 2) */ 1318 ceph_encode_32(&p, 0); 1319 /* inline version (version 4) */ 1320 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE); 1321 /* inline data size */ 1322 ceph_encode_32(&p, 0); 1323 /* 1324 * osd_epoch_barrier (version 5) 1325 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in 1326 * case it was recently changed 1327 */ 1328 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier)); 1329 /* oldest_flush_tid (version 6) */ 1330 ceph_encode_64(&p, arg->oldest_flush_tid); 1331 1332 /* 1333 * caller_uid/caller_gid (version 7) 1334 * 1335 * Currently, we don't properly track which caller dirtied the caps 1336 * last, and force a flush of them when there is a conflict. For now, 1337 * just set this to 0:0, to emulate how the MDS has worked up to now. 1338 */ 1339 ceph_encode_32(&p, 0); 1340 ceph_encode_32(&p, 0); 1341 1342 /* pool namespace (version 8) (mds always ignores this) */ 1343 ceph_encode_32(&p, 0); 1344 1345 /* btime and change_attr (version 9) */ 1346 ceph_encode_timespec64(p, &arg->btime); 1347 p += sizeof(struct ceph_timespec); 1348 ceph_encode_64(&p, arg->change_attr); 1349 1350 /* Advisory flags (version 10) */ 1351 ceph_encode_32(&p, arg->flags); 1352 1353 /* dirstats (version 11) - these are r/o on the client */ 1354 ceph_encode_64(&p, 0); 1355 ceph_encode_64(&p, 0); 1356 1357 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 1358 /* 1359 * fscrypt_auth and fscrypt_file (version 12) 1360 * 1361 * fscrypt_auth holds the crypto context (if any). fscrypt_file 1362 * tracks the real i_size as an __le64 field (and we use a rounded-up 1363 * i_size in the traditional size field). 1364 */ 1365 ceph_encode_32(&p, arg->fscrypt_auth_len); 1366 ceph_encode_copy(&p, arg->fscrypt_auth, arg->fscrypt_auth_len); 1367 ceph_encode_32(&p, sizeof(__le64)); 1368 ceph_encode_64(&p, arg->size); 1369 #else /* CONFIG_FS_ENCRYPTION */ 1370 ceph_encode_32(&p, 0); 1371 ceph_encode_32(&p, 0); 1372 #endif /* CONFIG_FS_ENCRYPTION */ 1373 } 1374 1375 /* 1376 * Queue cap releases when an inode is dropped from our cache. 1377 */ 1378 void __ceph_remove_caps(struct ceph_inode_info *ci) 1379 { 1380 struct inode *inode = &ci->netfs.inode; 1381 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc; 1382 struct rb_node *p; 1383 1384 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU) 1385 * may call __ceph_caps_issued_mask() on a freeing inode. */ 1386 spin_lock(&ci->i_ceph_lock); 1387 p = rb_first(&ci->i_caps); 1388 while (p) { 1389 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); 1390 p = rb_next(p); 1391 ceph_remove_cap(mdsc, cap, true); 1392 } 1393 spin_unlock(&ci->i_ceph_lock); 1394 } 1395 1396 /* 1397 * Prepare to send a cap message to an MDS. Update the cap state, and populate 1398 * the arg struct with the parameters that will need to be sent. This should 1399 * be done under the i_ceph_lock to guard against changes to cap state. 1400 * 1401 * Make note of max_size reported/requested from mds, revoked caps 1402 * that have now been implemented. 1403 */ 1404 static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap, 1405 int op, int flags, int used, int want, int retain, 1406 int flushing, u64 flush_tid, u64 oldest_flush_tid) 1407 { 1408 struct ceph_inode_info *ci = cap->ci; 1409 struct inode *inode = &ci->netfs.inode; 1410 struct ceph_client *cl = ceph_inode_to_client(inode); 1411 int held, revoking; 1412 1413 lockdep_assert_held(&ci->i_ceph_lock); 1414 1415 held = cap->issued | cap->implemented; 1416 revoking = cap->implemented & ~cap->issued; 1417 retain &= ~revoking; 1418 1419 doutc(cl, "%p %llx.%llx cap %p session %p %s -> %s (revoking %s)\n", 1420 inode, ceph_vinop(inode), cap, cap->session, 1421 ceph_cap_string(held), ceph_cap_string(held & retain), 1422 ceph_cap_string(revoking)); 1423 BUG_ON((retain & CEPH_CAP_PIN) == 0); 1424 1425 ci->i_ceph_flags &= ~CEPH_I_FLUSH; 1426 1427 cap->issued &= retain; /* drop bits we don't want */ 1428 /* 1429 * Wake up any waiters on wanted -> needed transition. This is due to 1430 * the weird transition from buffered to sync IO... we need to flush 1431 * dirty pages _before_ allowing sync writes to avoid reordering. 1432 */ 1433 arg->wake = cap->implemented & ~cap->issued; 1434 cap->implemented &= cap->issued | used; 1435 cap->mds_wanted = want; 1436 1437 arg->session = cap->session; 1438 arg->ino = ceph_vino(inode).ino; 1439 arg->cid = cap->cap_id; 1440 arg->follows = flushing ? ci->i_head_snapc->seq : 0; 1441 arg->flush_tid = flush_tid; 1442 arg->oldest_flush_tid = oldest_flush_tid; 1443 arg->size = i_size_read(inode); 1444 ci->i_reported_size = arg->size; 1445 arg->max_size = ci->i_wanted_max_size; 1446 if (cap == ci->i_auth_cap) { 1447 if (want & CEPH_CAP_ANY_FILE_WR) 1448 ci->i_requested_max_size = arg->max_size; 1449 else 1450 ci->i_requested_max_size = 0; 1451 } 1452 1453 if (flushing & CEPH_CAP_XATTR_EXCL) { 1454 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci); 1455 arg->xattr_version = ci->i_xattrs.version; 1456 arg->xattr_buf = ceph_buffer_get(ci->i_xattrs.blob); 1457 } else { 1458 arg->xattr_buf = NULL; 1459 arg->old_xattr_buf = NULL; 1460 } 1461 1462 arg->mtime = inode_get_mtime(inode); 1463 arg->atime = inode_get_atime(inode); 1464 arg->ctime = inode_get_ctime(inode); 1465 arg->btime = ci->i_btime; 1466 arg->change_attr = inode_peek_iversion_raw(inode); 1467 1468 arg->op = op; 1469 arg->caps = cap->implemented; 1470 arg->wanted = want; 1471 arg->dirty = flushing; 1472 1473 arg->seq = cap->seq; 1474 arg->issue_seq = cap->issue_seq; 1475 arg->mseq = cap->mseq; 1476 arg->time_warp_seq = ci->i_time_warp_seq; 1477 1478 arg->uid = inode->i_uid; 1479 arg->gid = inode->i_gid; 1480 arg->mode = inode->i_mode; 1481 1482 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE; 1483 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) && 1484 !list_empty(&ci->i_cap_snaps)) { 1485 struct ceph_cap_snap *capsnap; 1486 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) { 1487 if (capsnap->cap_flush.tid) 1488 break; 1489 if (capsnap->need_flush) { 1490 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP; 1491 break; 1492 } 1493 } 1494 } 1495 arg->flags = flags; 1496 arg->encrypted = IS_ENCRYPTED(inode); 1497 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 1498 if (ci->fscrypt_auth_len && 1499 WARN_ON_ONCE(ci->fscrypt_auth_len > sizeof(struct ceph_fscrypt_auth))) { 1500 /* Don't set this if it's too big */ 1501 arg->fscrypt_auth_len = 0; 1502 } else { 1503 arg->fscrypt_auth_len = ci->fscrypt_auth_len; 1504 memcpy(arg->fscrypt_auth, ci->fscrypt_auth, 1505 min_t(size_t, ci->fscrypt_auth_len, 1506 sizeof(arg->fscrypt_auth))); 1507 } 1508 #endif /* CONFIG_FS_ENCRYPTION */ 1509 } 1510 1511 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 1512 #define CAP_MSG_FIXED_FIELDS (sizeof(struct ceph_mds_caps) + \ 1513 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4 + 8 + 8 + 4 + 4 + 8) 1514 1515 static inline int cap_msg_size(struct cap_msg_args *arg) 1516 { 1517 return CAP_MSG_FIXED_FIELDS + arg->fscrypt_auth_len; 1518 } 1519 #else 1520 #define CAP_MSG_FIXED_FIELDS (sizeof(struct ceph_mds_caps) + \ 1521 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4 + 8 + 8 + 4 + 4) 1522 1523 static inline int cap_msg_size(struct cap_msg_args *arg) 1524 { 1525 return CAP_MSG_FIXED_FIELDS; 1526 } 1527 #endif /* CONFIG_FS_ENCRYPTION */ 1528 1529 /* 1530 * Send a cap msg on the given inode. 1531 * 1532 * Caller should hold snap_rwsem (read), s_mutex. 1533 */ 1534 static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci) 1535 { 1536 struct ceph_msg *msg; 1537 struct inode *inode = &ci->netfs.inode; 1538 struct ceph_client *cl = ceph_inode_to_client(inode); 1539 1540 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(arg), GFP_NOFS, 1541 false); 1542 if (!msg) { 1543 pr_err_client(cl, 1544 "error allocating cap msg: ino (%llx.%llx)" 1545 " flushing %s tid %llu, requeuing cap.\n", 1546 ceph_vinop(inode), ceph_cap_string(arg->dirty), 1547 arg->flush_tid); 1548 spin_lock(&ci->i_ceph_lock); 1549 __cap_delay_requeue(arg->session->s_mdsc, ci); 1550 spin_unlock(&ci->i_ceph_lock); 1551 return; 1552 } 1553 1554 encode_cap_msg(msg, arg); 1555 ceph_con_send(&arg->session->s_con, msg); 1556 ceph_buffer_put(arg->old_xattr_buf); 1557 ceph_buffer_put(arg->xattr_buf); 1558 if (arg->wake) 1559 wake_up_all(&ci->i_cap_wq); 1560 } 1561 1562 static inline int __send_flush_snap(struct inode *inode, 1563 struct ceph_mds_session *session, 1564 struct ceph_cap_snap *capsnap, 1565 u32 mseq, u64 oldest_flush_tid) 1566 { 1567 struct cap_msg_args arg; 1568 struct ceph_msg *msg; 1569 1570 arg.session = session; 1571 arg.ino = ceph_vino(inode).ino; 1572 arg.cid = 0; 1573 arg.follows = capsnap->follows; 1574 arg.flush_tid = capsnap->cap_flush.tid; 1575 arg.oldest_flush_tid = oldest_flush_tid; 1576 1577 arg.size = capsnap->size; 1578 arg.max_size = 0; 1579 arg.xattr_version = capsnap->xattr_version; 1580 arg.xattr_buf = capsnap->xattr_blob; 1581 arg.old_xattr_buf = NULL; 1582 1583 arg.atime = capsnap->atime; 1584 arg.mtime = capsnap->mtime; 1585 arg.ctime = capsnap->ctime; 1586 arg.btime = capsnap->btime; 1587 arg.change_attr = capsnap->change_attr; 1588 1589 arg.op = CEPH_CAP_OP_FLUSHSNAP; 1590 arg.caps = capsnap->issued; 1591 arg.wanted = 0; 1592 arg.dirty = capsnap->dirty; 1593 1594 arg.seq = 0; 1595 arg.issue_seq = 0; 1596 arg.mseq = mseq; 1597 arg.time_warp_seq = capsnap->time_warp_seq; 1598 1599 arg.uid = capsnap->uid; 1600 arg.gid = capsnap->gid; 1601 arg.mode = capsnap->mode; 1602 1603 arg.inline_data = capsnap->inline_data; 1604 arg.flags = 0; 1605 arg.wake = false; 1606 arg.encrypted = IS_ENCRYPTED(inode); 1607 1608 /* No fscrypt_auth changes from a capsnap.*/ 1609 arg.fscrypt_auth_len = 0; 1610 1611 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(&arg), 1612 GFP_NOFS, false); 1613 if (!msg) 1614 return -ENOMEM; 1615 1616 encode_cap_msg(msg, &arg); 1617 ceph_con_send(&arg.session->s_con, msg); 1618 return 0; 1619 } 1620 1621 /* 1622 * When a snapshot is taken, clients accumulate dirty metadata on 1623 * inodes with capabilities in ceph_cap_snaps to describe the file 1624 * state at the time the snapshot was taken. This must be flushed 1625 * asynchronously back to the MDS once sync writes complete and dirty 1626 * data is written out. 1627 * 1628 * Called under i_ceph_lock. 1629 */ 1630 static void __ceph_flush_snaps(struct ceph_inode_info *ci, 1631 struct ceph_mds_session *session) 1632 __releases(ci->i_ceph_lock) 1633 __acquires(ci->i_ceph_lock) 1634 { 1635 struct inode *inode = &ci->netfs.inode; 1636 struct ceph_mds_client *mdsc = session->s_mdsc; 1637 struct ceph_client *cl = mdsc->fsc->client; 1638 struct ceph_cap_snap *capsnap; 1639 u64 oldest_flush_tid = 0; 1640 u64 first_tid = 1, last_tid = 0; 1641 1642 doutc(cl, "%p %llx.%llx session %p\n", inode, ceph_vinop(inode), 1643 session); 1644 1645 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 1646 /* 1647 * we need to wait for sync writes to complete and for dirty 1648 * pages to be written out. 1649 */ 1650 if (capsnap->dirty_pages || capsnap->writing) 1651 break; 1652 1653 /* should be removed by ceph_try_drop_cap_snap() */ 1654 BUG_ON(!capsnap->need_flush); 1655 1656 /* only flush each capsnap once */ 1657 if (capsnap->cap_flush.tid > 0) { 1658 doutc(cl, "already flushed %p, skipping\n", capsnap); 1659 continue; 1660 } 1661 1662 spin_lock(&mdsc->cap_dirty_lock); 1663 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid; 1664 list_add_tail(&capsnap->cap_flush.g_list, 1665 &mdsc->cap_flush_list); 1666 if (oldest_flush_tid == 0) 1667 oldest_flush_tid = __get_oldest_flush_tid(mdsc); 1668 if (list_empty(&ci->i_flushing_item)) { 1669 list_add_tail(&ci->i_flushing_item, 1670 &session->s_cap_flushing); 1671 } 1672 spin_unlock(&mdsc->cap_dirty_lock); 1673 1674 list_add_tail(&capsnap->cap_flush.i_list, 1675 &ci->i_cap_flush_list); 1676 1677 if (first_tid == 1) 1678 first_tid = capsnap->cap_flush.tid; 1679 last_tid = capsnap->cap_flush.tid; 1680 } 1681 1682 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS; 1683 1684 while (first_tid <= last_tid) { 1685 struct ceph_cap *cap = ci->i_auth_cap; 1686 struct ceph_cap_flush *cf = NULL, *iter; 1687 int ret; 1688 1689 if (!(cap && cap->session == session)) { 1690 doutc(cl, "%p %llx.%llx auth cap %p not mds%d, stop\n", 1691 inode, ceph_vinop(inode), cap, session->s_mds); 1692 break; 1693 } 1694 1695 ret = -ENOENT; 1696 list_for_each_entry(iter, &ci->i_cap_flush_list, i_list) { 1697 if (iter->tid >= first_tid) { 1698 cf = iter; 1699 ret = 0; 1700 break; 1701 } 1702 } 1703 if (ret < 0) 1704 break; 1705 1706 first_tid = cf->tid + 1; 1707 1708 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush); 1709 refcount_inc(&capsnap->nref); 1710 spin_unlock(&ci->i_ceph_lock); 1711 1712 doutc(cl, "%p %llx.%llx capsnap %p tid %llu %s\n", inode, 1713 ceph_vinop(inode), capsnap, cf->tid, 1714 ceph_cap_string(capsnap->dirty)); 1715 1716 ret = __send_flush_snap(inode, session, capsnap, cap->mseq, 1717 oldest_flush_tid); 1718 if (ret < 0) { 1719 pr_err_client(cl, "error sending cap flushsnap, " 1720 "ino (%llx.%llx) tid %llu follows %llu\n", 1721 ceph_vinop(inode), cf->tid, 1722 capsnap->follows); 1723 } 1724 1725 ceph_put_cap_snap(capsnap); 1726 spin_lock(&ci->i_ceph_lock); 1727 } 1728 } 1729 1730 void ceph_flush_snaps(struct ceph_inode_info *ci, 1731 struct ceph_mds_session **psession) 1732 { 1733 struct inode *inode = &ci->netfs.inode; 1734 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc; 1735 struct ceph_client *cl = ceph_inode_to_client(inode); 1736 struct ceph_mds_session *session = NULL; 1737 bool need_put = false; 1738 int mds; 1739 1740 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 1741 if (psession) 1742 session = *psession; 1743 retry: 1744 spin_lock(&ci->i_ceph_lock); 1745 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) { 1746 doutc(cl, " no capsnap needs flush, doing nothing\n"); 1747 goto out; 1748 } 1749 if (!ci->i_auth_cap) { 1750 doutc(cl, " no auth cap (migrating?), doing nothing\n"); 1751 goto out; 1752 } 1753 1754 mds = ci->i_auth_cap->session->s_mds; 1755 if (session && session->s_mds != mds) { 1756 doutc(cl, " oops, wrong session %p mutex\n", session); 1757 ceph_put_mds_session(session); 1758 session = NULL; 1759 } 1760 if (!session) { 1761 spin_unlock(&ci->i_ceph_lock); 1762 mutex_lock(&mdsc->mutex); 1763 session = __ceph_lookup_mds_session(mdsc, mds); 1764 mutex_unlock(&mdsc->mutex); 1765 goto retry; 1766 } 1767 1768 // make sure flushsnap messages are sent in proper order. 1769 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) 1770 __kick_flushing_caps(mdsc, session, ci, 0); 1771 1772 __ceph_flush_snaps(ci, session); 1773 out: 1774 spin_unlock(&ci->i_ceph_lock); 1775 1776 if (psession) 1777 *psession = session; 1778 else 1779 ceph_put_mds_session(session); 1780 /* we flushed them all; remove this inode from the queue */ 1781 spin_lock(&mdsc->snap_flush_lock); 1782 if (!list_empty(&ci->i_snap_flush_item)) 1783 need_put = true; 1784 list_del_init(&ci->i_snap_flush_item); 1785 spin_unlock(&mdsc->snap_flush_lock); 1786 1787 if (need_put) 1788 iput(inode); 1789 } 1790 1791 /* 1792 * Mark caps dirty. If inode is newly dirty, return the dirty flags. 1793 * Caller is then responsible for calling __mark_inode_dirty with the 1794 * returned flags value. 1795 */ 1796 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 1797 struct ceph_cap_flush **pcf) 1798 { 1799 struct ceph_mds_client *mdsc = 1800 ceph_sb_to_fs_client(ci->netfs.inode.i_sb)->mdsc; 1801 struct inode *inode = &ci->netfs.inode; 1802 struct ceph_client *cl = ceph_inode_to_client(inode); 1803 int was = ci->i_dirty_caps; 1804 int dirty = 0; 1805 1806 lockdep_assert_held(&ci->i_ceph_lock); 1807 1808 if (!ci->i_auth_cap) { 1809 pr_warn_client(cl, "%p %llx.%llx mask %s, " 1810 "but no auth cap (session was closed?)\n", 1811 inode, ceph_vinop(inode), 1812 ceph_cap_string(mask)); 1813 return 0; 1814 } 1815 1816 doutc(cl, "%p %llx.%llx %s dirty %s -> %s\n", inode, 1817 ceph_vinop(inode), ceph_cap_string(mask), 1818 ceph_cap_string(was), ceph_cap_string(was | mask)); 1819 ci->i_dirty_caps |= mask; 1820 if (was == 0) { 1821 struct ceph_mds_session *session = ci->i_auth_cap->session; 1822 1823 WARN_ON_ONCE(ci->i_prealloc_cap_flush); 1824 swap(ci->i_prealloc_cap_flush, *pcf); 1825 1826 if (!ci->i_head_snapc) { 1827 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem)); 1828 ci->i_head_snapc = ceph_get_snap_context( 1829 ci->i_snap_realm->cached_context); 1830 } 1831 doutc(cl, "%p %llx.%llx now dirty snapc %p auth cap %p\n", 1832 inode, ceph_vinop(inode), ci->i_head_snapc, 1833 ci->i_auth_cap); 1834 BUG_ON(!list_empty(&ci->i_dirty_item)); 1835 spin_lock(&mdsc->cap_dirty_lock); 1836 list_add(&ci->i_dirty_item, &session->s_cap_dirty); 1837 spin_unlock(&mdsc->cap_dirty_lock); 1838 if (ci->i_flushing_caps == 0) { 1839 ihold(inode); 1840 dirty |= I_DIRTY_SYNC; 1841 } 1842 } else { 1843 WARN_ON_ONCE(!ci->i_prealloc_cap_flush); 1844 } 1845 BUG_ON(list_empty(&ci->i_dirty_item)); 1846 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && 1847 (mask & CEPH_CAP_FILE_BUFFER)) 1848 dirty |= I_DIRTY_DATASYNC; 1849 __cap_delay_requeue(mdsc, ci); 1850 return dirty; 1851 } 1852 1853 struct ceph_cap_flush *ceph_alloc_cap_flush(void) 1854 { 1855 struct ceph_cap_flush *cf; 1856 1857 cf = kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL); 1858 if (!cf) 1859 return NULL; 1860 1861 cf->is_capsnap = false; 1862 return cf; 1863 } 1864 1865 void ceph_free_cap_flush(struct ceph_cap_flush *cf) 1866 { 1867 if (cf) 1868 kmem_cache_free(ceph_cap_flush_cachep, cf); 1869 } 1870 1871 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc) 1872 { 1873 if (!list_empty(&mdsc->cap_flush_list)) { 1874 struct ceph_cap_flush *cf = 1875 list_first_entry(&mdsc->cap_flush_list, 1876 struct ceph_cap_flush, g_list); 1877 return cf->tid; 1878 } 1879 return 0; 1880 } 1881 1882 /* 1883 * Remove cap_flush from the mdsc's or inode's flushing cap list. 1884 * Return true if caller needs to wake up flush waiters. 1885 */ 1886 static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc, 1887 struct ceph_cap_flush *cf) 1888 { 1889 struct ceph_cap_flush *prev; 1890 bool wake = cf->wake; 1891 1892 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) { 1893 prev = list_prev_entry(cf, g_list); 1894 prev->wake = true; 1895 wake = false; 1896 } 1897 list_del_init(&cf->g_list); 1898 return wake; 1899 } 1900 1901 static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci, 1902 struct ceph_cap_flush *cf) 1903 { 1904 struct ceph_cap_flush *prev; 1905 bool wake = cf->wake; 1906 1907 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) { 1908 prev = list_prev_entry(cf, i_list); 1909 prev->wake = true; 1910 wake = false; 1911 } 1912 list_del_init(&cf->i_list); 1913 return wake; 1914 } 1915 1916 /* 1917 * Add dirty inode to the flushing list. Assigned a seq number so we 1918 * can wait for caps to flush without starving. 1919 * 1920 * Called under i_ceph_lock. Returns the flush tid. 1921 */ 1922 static u64 __mark_caps_flushing(struct inode *inode, 1923 struct ceph_mds_session *session, bool wake, 1924 u64 *oldest_flush_tid) 1925 { 1926 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 1927 struct ceph_client *cl = ceph_inode_to_client(inode); 1928 struct ceph_inode_info *ci = ceph_inode(inode); 1929 struct ceph_cap_flush *cf = NULL; 1930 int flushing; 1931 1932 lockdep_assert_held(&ci->i_ceph_lock); 1933 BUG_ON(ci->i_dirty_caps == 0); 1934 BUG_ON(list_empty(&ci->i_dirty_item)); 1935 BUG_ON(!ci->i_prealloc_cap_flush); 1936 1937 flushing = ci->i_dirty_caps; 1938 doutc(cl, "flushing %s, flushing_caps %s -> %s\n", 1939 ceph_cap_string(flushing), 1940 ceph_cap_string(ci->i_flushing_caps), 1941 ceph_cap_string(ci->i_flushing_caps | flushing)); 1942 ci->i_flushing_caps |= flushing; 1943 ci->i_dirty_caps = 0; 1944 doutc(cl, "%p %llx.%llx now !dirty\n", inode, ceph_vinop(inode)); 1945 1946 swap(cf, ci->i_prealloc_cap_flush); 1947 cf->caps = flushing; 1948 cf->wake = wake; 1949 1950 spin_lock(&mdsc->cap_dirty_lock); 1951 list_del_init(&ci->i_dirty_item); 1952 1953 cf->tid = ++mdsc->last_cap_flush_tid; 1954 list_add_tail(&cf->g_list, &mdsc->cap_flush_list); 1955 *oldest_flush_tid = __get_oldest_flush_tid(mdsc); 1956 1957 if (list_empty(&ci->i_flushing_item)) { 1958 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); 1959 mdsc->num_cap_flushing++; 1960 } 1961 spin_unlock(&mdsc->cap_dirty_lock); 1962 1963 list_add_tail(&cf->i_list, &ci->i_cap_flush_list); 1964 1965 return cf->tid; 1966 } 1967 1968 /* 1969 * try to invalidate mapping pages without blocking. 1970 */ 1971 static int try_nonblocking_invalidate(struct inode *inode) 1972 __releases(ci->i_ceph_lock) 1973 __acquires(ci->i_ceph_lock) 1974 { 1975 struct ceph_client *cl = ceph_inode_to_client(inode); 1976 struct ceph_inode_info *ci = ceph_inode(inode); 1977 u32 invalidating_gen = ci->i_rdcache_gen; 1978 1979 spin_unlock(&ci->i_ceph_lock); 1980 ceph_fscache_invalidate(inode, false); 1981 invalidate_mapping_pages(&inode->i_data, 0, -1); 1982 spin_lock(&ci->i_ceph_lock); 1983 1984 if (inode->i_data.nrpages == 0 && 1985 invalidating_gen == ci->i_rdcache_gen) { 1986 /* success. */ 1987 doutc(cl, "%p %llx.%llx success\n", inode, 1988 ceph_vinop(inode)); 1989 /* save any racing async invalidate some trouble */ 1990 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; 1991 return 0; 1992 } 1993 doutc(cl, "%p %llx.%llx failed\n", inode, ceph_vinop(inode)); 1994 return -1; 1995 } 1996 1997 bool __ceph_should_report_size(struct ceph_inode_info *ci) 1998 { 1999 loff_t size = i_size_read(&ci->netfs.inode); 2000 /* mds will adjust max size according to the reported size */ 2001 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR) 2002 return false; 2003 if (size >= ci->i_max_size) 2004 return true; 2005 /* half of previous max_size increment has been used */ 2006 if (ci->i_max_size > ci->i_reported_size && 2007 (size << 1) >= ci->i_max_size + ci->i_reported_size) 2008 return true; 2009 return false; 2010 } 2011 2012 /* 2013 * Swiss army knife function to examine currently used and wanted 2014 * versus held caps. Release, flush, ack revoked caps to mds as 2015 * appropriate. 2016 * 2017 * CHECK_CAPS_AUTHONLY - we should only check the auth cap 2018 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without 2019 * further delay. 2020 * CHECK_CAPS_FLUSH_FORCE - we should flush any caps immediately, without 2021 * further delay. 2022 */ 2023 void ceph_check_caps(struct ceph_inode_info *ci, int flags) 2024 { 2025 struct inode *inode = &ci->netfs.inode; 2026 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 2027 struct ceph_client *cl = ceph_inode_to_client(inode); 2028 struct ceph_cap *cap; 2029 u64 flush_tid, oldest_flush_tid; 2030 int file_wanted, used, cap_used; 2031 int issued, implemented, want, retain, revoking, flushing = 0; 2032 int mds = -1; /* keep track of how far we've gone through i_caps list 2033 to avoid an infinite loop on retry */ 2034 struct rb_node *p; 2035 bool queue_invalidate = false; 2036 bool tried_invalidate = false; 2037 bool queue_writeback = false; 2038 struct ceph_mds_session *session = NULL; 2039 2040 spin_lock(&ci->i_ceph_lock); 2041 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) { 2042 ci->i_ceph_flags |= CEPH_I_ASYNC_CHECK_CAPS; 2043 2044 /* Don't send messages until we get async create reply */ 2045 spin_unlock(&ci->i_ceph_lock); 2046 return; 2047 } 2048 2049 if (ci->i_ceph_flags & CEPH_I_FLUSH) 2050 flags |= CHECK_CAPS_FLUSH; 2051 retry: 2052 /* Caps wanted by virtue of active open files. */ 2053 file_wanted = __ceph_caps_file_wanted(ci); 2054 2055 /* Caps which have active references against them */ 2056 used = __ceph_caps_used(ci); 2057 2058 /* 2059 * "issued" represents the current caps that the MDS wants us to have. 2060 * "implemented" is the set that we have been granted, and includes the 2061 * ones that have not yet been returned to the MDS (the "revoking" set, 2062 * usually because they have outstanding references). 2063 */ 2064 issued = __ceph_caps_issued(ci, &implemented); 2065 revoking = implemented & ~issued; 2066 2067 want = file_wanted; 2068 2069 /* The ones we currently want to retain (may be adjusted below) */ 2070 retain = file_wanted | used | CEPH_CAP_PIN; 2071 if (!mdsc->stopping && inode->i_nlink > 0) { 2072 if (file_wanted) { 2073 retain |= CEPH_CAP_ANY; /* be greedy */ 2074 } else if (S_ISDIR(inode->i_mode) && 2075 (issued & CEPH_CAP_FILE_SHARED) && 2076 __ceph_dir_is_complete(ci)) { 2077 /* 2078 * If a directory is complete, we want to keep 2079 * the exclusive cap. So that MDS does not end up 2080 * revoking the shared cap on every create/unlink 2081 * operation. 2082 */ 2083 if (IS_RDONLY(inode)) { 2084 want = CEPH_CAP_ANY_SHARED; 2085 } else { 2086 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL; 2087 } 2088 retain |= want; 2089 } else { 2090 2091 retain |= CEPH_CAP_ANY_SHARED; 2092 /* 2093 * keep RD only if we didn't have the file open RW, 2094 * because then the mds would revoke it anyway to 2095 * journal max_size=0. 2096 */ 2097 if (ci->i_max_size == 0) 2098 retain |= CEPH_CAP_ANY_RD; 2099 } 2100 } 2101 2102 doutc(cl, "%p %llx.%llx file_want %s used %s dirty %s " 2103 "flushing %s issued %s revoking %s retain %s %s%s%s%s\n", 2104 inode, ceph_vinop(inode), ceph_cap_string(file_wanted), 2105 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), 2106 ceph_cap_string(ci->i_flushing_caps), 2107 ceph_cap_string(issued), ceph_cap_string(revoking), 2108 ceph_cap_string(retain), 2109 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", 2110 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "", 2111 (flags & CHECK_CAPS_NOINVAL) ? " NOINVAL" : "", 2112 (flags & CHECK_CAPS_FLUSH_FORCE) ? " FLUSH_FORCE" : ""); 2113 2114 /* 2115 * If we no longer need to hold onto old our caps, and we may 2116 * have cached pages, but don't want them, then try to invalidate. 2117 * If we fail, it's because pages are locked.... try again later. 2118 */ 2119 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) && 2120 S_ISREG(inode->i_mode) && 2121 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */ 2122 inode->i_data.nrpages && /* have cached pages */ 2123 (revoking & (CEPH_CAP_FILE_CACHE| 2124 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */ 2125 !tried_invalidate) { 2126 doutc(cl, "trying to invalidate on %p %llx.%llx\n", 2127 inode, ceph_vinop(inode)); 2128 if (try_nonblocking_invalidate(inode) < 0) { 2129 doutc(cl, "queuing invalidate\n"); 2130 queue_invalidate = true; 2131 ci->i_rdcache_revoking = ci->i_rdcache_gen; 2132 } 2133 tried_invalidate = true; 2134 goto retry; 2135 } 2136 2137 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 2138 int mflags = 0; 2139 struct cap_msg_args arg; 2140 2141 cap = rb_entry(p, struct ceph_cap, ci_node); 2142 2143 /* avoid looping forever */ 2144 if (mds >= cap->mds || 2145 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) 2146 continue; 2147 2148 /* 2149 * If we have an auth cap, we don't need to consider any 2150 * overlapping caps as used. 2151 */ 2152 cap_used = used; 2153 if (ci->i_auth_cap && cap != ci->i_auth_cap) 2154 cap_used &= ~ci->i_auth_cap->issued; 2155 2156 revoking = cap->implemented & ~cap->issued; 2157 doutc(cl, " mds%d cap %p used %s issued %s implemented %s revoking %s\n", 2158 cap->mds, cap, ceph_cap_string(cap_used), 2159 ceph_cap_string(cap->issued), 2160 ceph_cap_string(cap->implemented), 2161 ceph_cap_string(revoking)); 2162 2163 /* completed revocation? going down and there are no caps? */ 2164 if (revoking) { 2165 if ((revoking & cap_used) == 0) { 2166 doutc(cl, "completed revocation of %s\n", 2167 ceph_cap_string(cap->implemented & ~cap->issued)); 2168 goto ack; 2169 } 2170 2171 /* 2172 * If the "i_wrbuffer_ref" was increased by mmap or generic 2173 * cache write just before the ceph_check_caps() is called, 2174 * the Fb capability revoking will fail this time. Then we 2175 * must wait for the BDI's delayed work to flush the dirty 2176 * pages and to release the "i_wrbuffer_ref", which will cost 2177 * at most 5 seconds. That means the MDS needs to wait at 2178 * most 5 seconds to finished the Fb capability's revocation. 2179 * 2180 * Let's queue a writeback for it. 2181 */ 2182 if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref && 2183 (revoking & CEPH_CAP_FILE_BUFFER)) 2184 queue_writeback = true; 2185 } 2186 2187 if (flags & CHECK_CAPS_FLUSH_FORCE) { 2188 doutc(cl, "force to flush caps\n"); 2189 goto ack; 2190 } 2191 2192 if (cap == ci->i_auth_cap && 2193 (cap->issued & CEPH_CAP_FILE_WR)) { 2194 /* request larger max_size from MDS? */ 2195 if (ci->i_wanted_max_size > ci->i_max_size && 2196 ci->i_wanted_max_size > ci->i_requested_max_size) { 2197 doutc(cl, "requesting new max_size\n"); 2198 goto ack; 2199 } 2200 2201 /* approaching file_max? */ 2202 if (__ceph_should_report_size(ci)) { 2203 doutc(cl, "i_size approaching max_size\n"); 2204 goto ack; 2205 } 2206 } 2207 /* flush anything dirty? */ 2208 if (cap == ci->i_auth_cap) { 2209 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) { 2210 doutc(cl, "flushing dirty caps\n"); 2211 goto ack; 2212 } 2213 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) { 2214 doutc(cl, "flushing snap caps\n"); 2215 goto ack; 2216 } 2217 } 2218 2219 /* want more caps from mds? */ 2220 if (want & ~cap->mds_wanted) { 2221 if (want & ~(cap->mds_wanted | cap->issued)) 2222 goto ack; 2223 if (!__cap_is_valid(cap)) 2224 goto ack; 2225 } 2226 2227 /* things we might delay */ 2228 if ((cap->issued & ~retain) == 0) 2229 continue; /* nope, all good */ 2230 2231 ack: 2232 ceph_put_mds_session(session); 2233 session = ceph_get_mds_session(cap->session); 2234 2235 /* kick flushing and flush snaps before sending normal 2236 * cap message */ 2237 if (cap == ci->i_auth_cap && 2238 (ci->i_ceph_flags & 2239 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) { 2240 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) 2241 __kick_flushing_caps(mdsc, session, ci, 0); 2242 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) 2243 __ceph_flush_snaps(ci, session); 2244 2245 goto retry; 2246 } 2247 2248 if (cap == ci->i_auth_cap && ci->i_dirty_caps) { 2249 flushing = ci->i_dirty_caps; 2250 flush_tid = __mark_caps_flushing(inode, session, false, 2251 &oldest_flush_tid); 2252 if (flags & CHECK_CAPS_FLUSH && 2253 list_empty(&session->s_cap_dirty)) 2254 mflags |= CEPH_CLIENT_CAPS_SYNC; 2255 } else { 2256 flushing = 0; 2257 flush_tid = 0; 2258 spin_lock(&mdsc->cap_dirty_lock); 2259 oldest_flush_tid = __get_oldest_flush_tid(mdsc); 2260 spin_unlock(&mdsc->cap_dirty_lock); 2261 } 2262 2263 mds = cap->mds; /* remember mds, so we don't repeat */ 2264 2265 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used, 2266 want, retain, flushing, flush_tid, oldest_flush_tid); 2267 2268 spin_unlock(&ci->i_ceph_lock); 2269 __send_cap(&arg, ci); 2270 spin_lock(&ci->i_ceph_lock); 2271 2272 goto retry; /* retake i_ceph_lock and restart our cap scan. */ 2273 } 2274 2275 /* periodically re-calculate caps wanted by open files */ 2276 if (__ceph_is_any_real_caps(ci) && 2277 list_empty(&ci->i_cap_delay_list) && 2278 (file_wanted & ~CEPH_CAP_PIN) && 2279 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { 2280 __cap_delay_requeue(mdsc, ci); 2281 } 2282 2283 spin_unlock(&ci->i_ceph_lock); 2284 2285 ceph_put_mds_session(session); 2286 if (queue_writeback) 2287 ceph_queue_writeback(inode); 2288 if (queue_invalidate) 2289 ceph_queue_invalidate(inode); 2290 } 2291 2292 /* 2293 * Try to flush dirty caps back to the auth mds. 2294 */ 2295 static int try_flush_caps(struct inode *inode, u64 *ptid) 2296 { 2297 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 2298 struct ceph_inode_info *ci = ceph_inode(inode); 2299 int flushing = 0; 2300 u64 flush_tid = 0, oldest_flush_tid = 0; 2301 2302 spin_lock(&ci->i_ceph_lock); 2303 retry_locked: 2304 if (ci->i_dirty_caps && ci->i_auth_cap) { 2305 struct ceph_cap *cap = ci->i_auth_cap; 2306 struct cap_msg_args arg; 2307 struct ceph_mds_session *session = cap->session; 2308 2309 if (session->s_state < CEPH_MDS_SESSION_OPEN) { 2310 spin_unlock(&ci->i_ceph_lock); 2311 goto out; 2312 } 2313 2314 if (ci->i_ceph_flags & 2315 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) { 2316 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) 2317 __kick_flushing_caps(mdsc, session, ci, 0); 2318 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) 2319 __ceph_flush_snaps(ci, session); 2320 goto retry_locked; 2321 } 2322 2323 flushing = ci->i_dirty_caps; 2324 flush_tid = __mark_caps_flushing(inode, session, true, 2325 &oldest_flush_tid); 2326 2327 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC, 2328 __ceph_caps_used(ci), __ceph_caps_wanted(ci), 2329 (cap->issued | cap->implemented), 2330 flushing, flush_tid, oldest_flush_tid); 2331 spin_unlock(&ci->i_ceph_lock); 2332 2333 __send_cap(&arg, ci); 2334 } else { 2335 if (!list_empty(&ci->i_cap_flush_list)) { 2336 struct ceph_cap_flush *cf = 2337 list_last_entry(&ci->i_cap_flush_list, 2338 struct ceph_cap_flush, i_list); 2339 cf->wake = true; 2340 flush_tid = cf->tid; 2341 } 2342 flushing = ci->i_flushing_caps; 2343 spin_unlock(&ci->i_ceph_lock); 2344 } 2345 out: 2346 *ptid = flush_tid; 2347 return flushing; 2348 } 2349 2350 /* 2351 * Return true if we've flushed caps through the given flush_tid. 2352 */ 2353 static int caps_are_flushed(struct inode *inode, u64 flush_tid) 2354 { 2355 struct ceph_inode_info *ci = ceph_inode(inode); 2356 int ret = 1; 2357 2358 spin_lock(&ci->i_ceph_lock); 2359 if (!list_empty(&ci->i_cap_flush_list)) { 2360 struct ceph_cap_flush * cf = 2361 list_first_entry(&ci->i_cap_flush_list, 2362 struct ceph_cap_flush, i_list); 2363 if (cf->tid <= flush_tid) 2364 ret = 0; 2365 } 2366 spin_unlock(&ci->i_ceph_lock); 2367 return ret; 2368 } 2369 2370 /* 2371 * flush the mdlog and wait for any unsafe requests to complete. 2372 */ 2373 static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) 2374 { 2375 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 2376 struct ceph_client *cl = ceph_inode_to_client(inode); 2377 struct ceph_inode_info *ci = ceph_inode(inode); 2378 struct ceph_mds_request *req1 = NULL, *req2 = NULL; 2379 int ret, err = 0; 2380 2381 spin_lock(&ci->i_unsafe_lock); 2382 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) { 2383 req1 = list_last_entry(&ci->i_unsafe_dirops, 2384 struct ceph_mds_request, 2385 r_unsafe_dir_item); 2386 ceph_mdsc_get_request(req1); 2387 } 2388 if (!list_empty(&ci->i_unsafe_iops)) { 2389 req2 = list_last_entry(&ci->i_unsafe_iops, 2390 struct ceph_mds_request, 2391 r_unsafe_target_item); 2392 ceph_mdsc_get_request(req2); 2393 } 2394 spin_unlock(&ci->i_unsafe_lock); 2395 2396 /* 2397 * Trigger to flush the journal logs in all the relevant MDSes 2398 * manually, or in the worst case we must wait at most 5 seconds 2399 * to wait the journal logs to be flushed by the MDSes periodically. 2400 */ 2401 if (req1 || req2) { 2402 struct ceph_mds_request *req; 2403 struct ceph_mds_session **sessions; 2404 struct ceph_mds_session *s; 2405 unsigned int max_sessions; 2406 int i; 2407 2408 mutex_lock(&mdsc->mutex); 2409 max_sessions = mdsc->max_sessions; 2410 2411 sessions = kcalloc(max_sessions, sizeof(s), GFP_KERNEL); 2412 if (!sessions) { 2413 mutex_unlock(&mdsc->mutex); 2414 err = -ENOMEM; 2415 goto out; 2416 } 2417 2418 spin_lock(&ci->i_unsafe_lock); 2419 if (req1) { 2420 list_for_each_entry(req, &ci->i_unsafe_dirops, 2421 r_unsafe_dir_item) { 2422 s = req->r_session; 2423 if (!s) 2424 continue; 2425 if (!sessions[s->s_mds]) { 2426 s = ceph_get_mds_session(s); 2427 sessions[s->s_mds] = s; 2428 } 2429 } 2430 } 2431 if (req2) { 2432 list_for_each_entry(req, &ci->i_unsafe_iops, 2433 r_unsafe_target_item) { 2434 s = req->r_session; 2435 if (!s) 2436 continue; 2437 if (!sessions[s->s_mds]) { 2438 s = ceph_get_mds_session(s); 2439 sessions[s->s_mds] = s; 2440 } 2441 } 2442 } 2443 spin_unlock(&ci->i_unsafe_lock); 2444 2445 /* the auth MDS */ 2446 spin_lock(&ci->i_ceph_lock); 2447 if (ci->i_auth_cap) { 2448 s = ci->i_auth_cap->session; 2449 if (!sessions[s->s_mds]) 2450 sessions[s->s_mds] = ceph_get_mds_session(s); 2451 } 2452 spin_unlock(&ci->i_ceph_lock); 2453 mutex_unlock(&mdsc->mutex); 2454 2455 /* send flush mdlog request to MDSes */ 2456 for (i = 0; i < max_sessions; i++) { 2457 s = sessions[i]; 2458 if (s) { 2459 send_flush_mdlog(s); 2460 ceph_put_mds_session(s); 2461 } 2462 } 2463 kfree(sessions); 2464 } 2465 2466 doutc(cl, "%p %llx.%llx wait on tid %llu %llu\n", inode, 2467 ceph_vinop(inode), req1 ? req1->r_tid : 0ULL, 2468 req2 ? req2->r_tid : 0ULL); 2469 if (req1) { 2470 ret = !wait_for_completion_timeout(&req1->r_safe_completion, 2471 ceph_timeout_jiffies(req1->r_timeout)); 2472 if (ret) 2473 err = -EIO; 2474 } 2475 if (req2) { 2476 ret = !wait_for_completion_timeout(&req2->r_safe_completion, 2477 ceph_timeout_jiffies(req2->r_timeout)); 2478 if (ret) 2479 err = -EIO; 2480 } 2481 2482 out: 2483 if (req1) 2484 ceph_mdsc_put_request(req1); 2485 if (req2) 2486 ceph_mdsc_put_request(req2); 2487 return err; 2488 } 2489 2490 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) 2491 { 2492 struct inode *inode = file->f_mapping->host; 2493 struct ceph_inode_info *ci = ceph_inode(inode); 2494 struct ceph_client *cl = ceph_inode_to_client(inode); 2495 u64 flush_tid; 2496 int ret, err; 2497 int dirty; 2498 2499 doutc(cl, "%p %llx.%llx%s\n", inode, ceph_vinop(inode), 2500 datasync ? " datasync" : ""); 2501 2502 ret = file_write_and_wait_range(file, start, end); 2503 if (datasync) 2504 goto out; 2505 2506 ret = ceph_wait_on_async_create(inode); 2507 if (ret) 2508 goto out; 2509 2510 dirty = try_flush_caps(inode, &flush_tid); 2511 doutc(cl, "dirty caps are %s\n", ceph_cap_string(dirty)); 2512 2513 err = flush_mdlog_and_wait_inode_unsafe_requests(inode); 2514 2515 /* 2516 * only wait on non-file metadata writeback (the mds 2517 * can recover size and mtime, so we don't need to 2518 * wait for that) 2519 */ 2520 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { 2521 err = wait_event_interruptible(ci->i_cap_wq, 2522 caps_are_flushed(inode, flush_tid)); 2523 } 2524 2525 if (err < 0) 2526 ret = err; 2527 2528 err = file_check_and_advance_wb_err(file); 2529 if (err < 0) 2530 ret = err; 2531 out: 2532 doutc(cl, "%p %llx.%llx%s result=%d\n", inode, ceph_vinop(inode), 2533 datasync ? " datasync" : "", ret); 2534 return ret; 2535 } 2536 2537 /* 2538 * Flush any dirty caps back to the mds. If we aren't asked to wait, 2539 * queue inode for flush but don't do so immediately, because we can 2540 * get by with fewer MDS messages if we wait for data writeback to 2541 * complete first. 2542 */ 2543 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) 2544 { 2545 struct ceph_inode_info *ci = ceph_inode(inode); 2546 struct ceph_client *cl = ceph_inode_to_client(inode); 2547 u64 flush_tid; 2548 int err = 0; 2549 int dirty; 2550 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync); 2551 2552 doutc(cl, "%p %llx.%llx wait=%d\n", inode, ceph_vinop(inode), wait); 2553 ceph_fscache_unpin_writeback(inode, wbc); 2554 if (wait) { 2555 err = ceph_wait_on_async_create(inode); 2556 if (err) 2557 return err; 2558 dirty = try_flush_caps(inode, &flush_tid); 2559 if (dirty) 2560 err = wait_event_interruptible(ci->i_cap_wq, 2561 caps_are_flushed(inode, flush_tid)); 2562 } else { 2563 struct ceph_mds_client *mdsc = 2564 ceph_sb_to_fs_client(inode->i_sb)->mdsc; 2565 2566 spin_lock(&ci->i_ceph_lock); 2567 if (__ceph_caps_dirty(ci)) 2568 __cap_delay_requeue_front(mdsc, ci); 2569 spin_unlock(&ci->i_ceph_lock); 2570 } 2571 return err; 2572 } 2573 2574 static void __kick_flushing_caps(struct ceph_mds_client *mdsc, 2575 struct ceph_mds_session *session, 2576 struct ceph_inode_info *ci, 2577 u64 oldest_flush_tid) 2578 __releases(ci->i_ceph_lock) 2579 __acquires(ci->i_ceph_lock) 2580 { 2581 struct inode *inode = &ci->netfs.inode; 2582 struct ceph_client *cl = mdsc->fsc->client; 2583 struct ceph_cap *cap; 2584 struct ceph_cap_flush *cf; 2585 int ret; 2586 u64 first_tid = 0; 2587 u64 last_snap_flush = 0; 2588 2589 /* Don't do anything until create reply comes in */ 2590 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) 2591 return; 2592 2593 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH; 2594 2595 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) { 2596 if (cf->is_capsnap) { 2597 last_snap_flush = cf->tid; 2598 break; 2599 } 2600 } 2601 2602 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) { 2603 if (cf->tid < first_tid) 2604 continue; 2605 2606 cap = ci->i_auth_cap; 2607 if (!(cap && cap->session == session)) { 2608 pr_err_client(cl, "%p auth cap %p not mds%d ???\n", 2609 inode, cap, session->s_mds); 2610 break; 2611 } 2612 2613 first_tid = cf->tid + 1; 2614 2615 if (!cf->is_capsnap) { 2616 struct cap_msg_args arg; 2617 2618 doutc(cl, "%p %llx.%llx cap %p tid %llu %s\n", 2619 inode, ceph_vinop(inode), cap, cf->tid, 2620 ceph_cap_string(cf->caps)); 2621 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, 2622 (cf->tid < last_snap_flush ? 2623 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0), 2624 __ceph_caps_used(ci), 2625 __ceph_caps_wanted(ci), 2626 (cap->issued | cap->implemented), 2627 cf->caps, cf->tid, oldest_flush_tid); 2628 spin_unlock(&ci->i_ceph_lock); 2629 __send_cap(&arg, ci); 2630 } else { 2631 struct ceph_cap_snap *capsnap = 2632 container_of(cf, struct ceph_cap_snap, 2633 cap_flush); 2634 doutc(cl, "%p %llx.%llx capsnap %p tid %llu %s\n", 2635 inode, ceph_vinop(inode), capsnap, cf->tid, 2636 ceph_cap_string(capsnap->dirty)); 2637 2638 refcount_inc(&capsnap->nref); 2639 spin_unlock(&ci->i_ceph_lock); 2640 2641 ret = __send_flush_snap(inode, session, capsnap, cap->mseq, 2642 oldest_flush_tid); 2643 if (ret < 0) { 2644 pr_err_client(cl, "error sending cap flushsnap," 2645 " %p %llx.%llx tid %llu follows %llu\n", 2646 inode, ceph_vinop(inode), cf->tid, 2647 capsnap->follows); 2648 } 2649 2650 ceph_put_cap_snap(capsnap); 2651 } 2652 2653 spin_lock(&ci->i_ceph_lock); 2654 } 2655 } 2656 2657 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 2658 struct ceph_mds_session *session) 2659 { 2660 struct ceph_client *cl = mdsc->fsc->client; 2661 struct ceph_inode_info *ci; 2662 struct ceph_cap *cap; 2663 u64 oldest_flush_tid; 2664 2665 doutc(cl, "mds%d\n", session->s_mds); 2666 2667 spin_lock(&mdsc->cap_dirty_lock); 2668 oldest_flush_tid = __get_oldest_flush_tid(mdsc); 2669 spin_unlock(&mdsc->cap_dirty_lock); 2670 2671 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { 2672 struct inode *inode = &ci->netfs.inode; 2673 2674 spin_lock(&ci->i_ceph_lock); 2675 cap = ci->i_auth_cap; 2676 if (!(cap && cap->session == session)) { 2677 pr_err_client(cl, "%p %llx.%llx auth cap %p not mds%d ???\n", 2678 inode, ceph_vinop(inode), cap, 2679 session->s_mds); 2680 spin_unlock(&ci->i_ceph_lock); 2681 continue; 2682 } 2683 2684 2685 /* 2686 * if flushing caps were revoked, we re-send the cap flush 2687 * in client reconnect stage. This guarantees MDS * processes 2688 * the cap flush message before issuing the flushing caps to 2689 * other client. 2690 */ 2691 if ((cap->issued & ci->i_flushing_caps) != 2692 ci->i_flushing_caps) { 2693 /* encode_caps_cb() also will reset these sequence 2694 * numbers. make sure sequence numbers in cap flush 2695 * message match later reconnect message */ 2696 cap->seq = 0; 2697 cap->issue_seq = 0; 2698 cap->mseq = 0; 2699 __kick_flushing_caps(mdsc, session, ci, 2700 oldest_flush_tid); 2701 } else { 2702 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH; 2703 } 2704 2705 spin_unlock(&ci->i_ceph_lock); 2706 } 2707 } 2708 2709 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 2710 struct ceph_mds_session *session) 2711 { 2712 struct ceph_client *cl = mdsc->fsc->client; 2713 struct ceph_inode_info *ci; 2714 struct ceph_cap *cap; 2715 u64 oldest_flush_tid; 2716 2717 lockdep_assert_held(&session->s_mutex); 2718 2719 doutc(cl, "mds%d\n", session->s_mds); 2720 2721 spin_lock(&mdsc->cap_dirty_lock); 2722 oldest_flush_tid = __get_oldest_flush_tid(mdsc); 2723 spin_unlock(&mdsc->cap_dirty_lock); 2724 2725 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { 2726 struct inode *inode = &ci->netfs.inode; 2727 2728 spin_lock(&ci->i_ceph_lock); 2729 cap = ci->i_auth_cap; 2730 if (!(cap && cap->session == session)) { 2731 pr_err_client(cl, "%p %llx.%llx auth cap %p not mds%d ???\n", 2732 inode, ceph_vinop(inode), cap, 2733 session->s_mds); 2734 spin_unlock(&ci->i_ceph_lock); 2735 continue; 2736 } 2737 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) { 2738 __kick_flushing_caps(mdsc, session, ci, 2739 oldest_flush_tid); 2740 } 2741 spin_unlock(&ci->i_ceph_lock); 2742 } 2743 } 2744 2745 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session, 2746 struct ceph_inode_info *ci) 2747 { 2748 struct ceph_mds_client *mdsc = session->s_mdsc; 2749 struct ceph_cap *cap = ci->i_auth_cap; 2750 struct inode *inode = &ci->netfs.inode; 2751 2752 lockdep_assert_held(&ci->i_ceph_lock); 2753 2754 doutc(mdsc->fsc->client, "%p %llx.%llx flushing %s\n", 2755 inode, ceph_vinop(inode), 2756 ceph_cap_string(ci->i_flushing_caps)); 2757 2758 if (!list_empty(&ci->i_cap_flush_list)) { 2759 u64 oldest_flush_tid; 2760 spin_lock(&mdsc->cap_dirty_lock); 2761 list_move_tail(&ci->i_flushing_item, 2762 &cap->session->s_cap_flushing); 2763 oldest_flush_tid = __get_oldest_flush_tid(mdsc); 2764 spin_unlock(&mdsc->cap_dirty_lock); 2765 2766 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid); 2767 } 2768 } 2769 2770 2771 /* 2772 * Take references to capabilities we hold, so that we don't release 2773 * them to the MDS prematurely. 2774 */ 2775 void ceph_take_cap_refs(struct ceph_inode_info *ci, int got, 2776 bool snap_rwsem_locked) 2777 { 2778 struct inode *inode = &ci->netfs.inode; 2779 struct ceph_client *cl = ceph_inode_to_client(inode); 2780 2781 lockdep_assert_held(&ci->i_ceph_lock); 2782 2783 if (got & CEPH_CAP_PIN) 2784 ci->i_pin_ref++; 2785 if (got & CEPH_CAP_FILE_RD) 2786 ci->i_rd_ref++; 2787 if (got & CEPH_CAP_FILE_CACHE) 2788 ci->i_rdcache_ref++; 2789 if (got & CEPH_CAP_FILE_EXCL) 2790 ci->i_fx_ref++; 2791 if (got & CEPH_CAP_FILE_WR) { 2792 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) { 2793 BUG_ON(!snap_rwsem_locked); 2794 ci->i_head_snapc = ceph_get_snap_context( 2795 ci->i_snap_realm->cached_context); 2796 } 2797 ci->i_wr_ref++; 2798 } 2799 if (got & CEPH_CAP_FILE_BUFFER) { 2800 if (ci->i_wb_ref == 0) 2801 ihold(inode); 2802 ci->i_wb_ref++; 2803 doutc(cl, "%p %llx.%llx wb %d -> %d (?)\n", inode, 2804 ceph_vinop(inode), ci->i_wb_ref-1, ci->i_wb_ref); 2805 } 2806 } 2807 2808 /* 2809 * Try to grab cap references. Specify those refs we @want, and the 2810 * minimal set we @need. Also include the larger offset we are writing 2811 * to (when applicable), and check against max_size here as well. 2812 * Note that caller is responsible for ensuring max_size increases are 2813 * requested from the MDS. 2814 * 2815 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed, 2816 * or a negative error code. There are 3 speical error codes: 2817 * -EAGAIN: need to sleep but non-blocking is specified 2818 * -EFBIG: ask caller to call check_max_size() and try again. 2819 * -EUCLEAN: ask caller to call ceph_renew_caps() and try again. 2820 */ 2821 enum { 2822 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */ 2823 NON_BLOCKING = (1 << 8), 2824 CHECK_FILELOCK = (1 << 9), 2825 }; 2826 2827 static int try_get_cap_refs(struct inode *inode, int need, int want, 2828 loff_t endoff, int flags, int *got) 2829 { 2830 struct ceph_inode_info *ci = ceph_inode(inode); 2831 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc; 2832 struct ceph_client *cl = ceph_inode_to_client(inode); 2833 int ret = 0; 2834 int have, implemented; 2835 bool snap_rwsem_locked = false; 2836 2837 doutc(cl, "%p %llx.%llx need %s want %s\n", inode, 2838 ceph_vinop(inode), ceph_cap_string(need), 2839 ceph_cap_string(want)); 2840 2841 again: 2842 spin_lock(&ci->i_ceph_lock); 2843 2844 if ((flags & CHECK_FILELOCK) && 2845 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) { 2846 doutc(cl, "%p %llx.%llx error filelock\n", inode, 2847 ceph_vinop(inode)); 2848 ret = -EIO; 2849 goto out_unlock; 2850 } 2851 2852 /* finish pending truncate */ 2853 while (ci->i_truncate_pending) { 2854 spin_unlock(&ci->i_ceph_lock); 2855 if (snap_rwsem_locked) { 2856 up_read(&mdsc->snap_rwsem); 2857 snap_rwsem_locked = false; 2858 } 2859 __ceph_do_pending_vmtruncate(inode); 2860 spin_lock(&ci->i_ceph_lock); 2861 } 2862 2863 have = __ceph_caps_issued(ci, &implemented); 2864 2865 if (have & need & CEPH_CAP_FILE_WR) { 2866 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { 2867 doutc(cl, "%p %llx.%llx endoff %llu > maxsize %llu\n", 2868 inode, ceph_vinop(inode), endoff, ci->i_max_size); 2869 if (endoff > ci->i_requested_max_size) 2870 ret = ci->i_auth_cap ? -EFBIG : -EUCLEAN; 2871 goto out_unlock; 2872 } 2873 /* 2874 * If a sync write is in progress, we must wait, so that we 2875 * can get a final snapshot value for size+mtime. 2876 */ 2877 if (__ceph_have_pending_cap_snap(ci)) { 2878 doutc(cl, "%p %llx.%llx cap_snap_pending\n", inode, 2879 ceph_vinop(inode)); 2880 goto out_unlock; 2881 } 2882 } 2883 2884 if ((have & need) == need) { 2885 /* 2886 * Look at (implemented & ~have & not) so that we keep waiting 2887 * on transition from wanted -> needed caps. This is needed 2888 * for WRBUFFER|WR -> WR to avoid a new WR sync write from 2889 * going before a prior buffered writeback happens. 2890 * 2891 * For RDCACHE|RD -> RD, there is not need to wait and we can 2892 * just exclude the revoking caps and force to sync read. 2893 */ 2894 int not = want & ~(have & need); 2895 int revoking = implemented & ~have; 2896 int exclude = revoking & not; 2897 doutc(cl, "%p %llx.%llx have %s but not %s (revoking %s)\n", 2898 inode, ceph_vinop(inode), ceph_cap_string(have), 2899 ceph_cap_string(not), ceph_cap_string(revoking)); 2900 if (!exclude || !(exclude & CEPH_CAP_FILE_BUFFER)) { 2901 if (!snap_rwsem_locked && 2902 !ci->i_head_snapc && 2903 (need & CEPH_CAP_FILE_WR)) { 2904 if (!down_read_trylock(&mdsc->snap_rwsem)) { 2905 /* 2906 * we can not call down_read() when 2907 * task isn't in TASK_RUNNING state 2908 */ 2909 if (flags & NON_BLOCKING) { 2910 ret = -EAGAIN; 2911 goto out_unlock; 2912 } 2913 2914 spin_unlock(&ci->i_ceph_lock); 2915 down_read(&mdsc->snap_rwsem); 2916 snap_rwsem_locked = true; 2917 goto again; 2918 } 2919 snap_rwsem_locked = true; 2920 } 2921 if ((have & want) == want) 2922 *got = need | (want & ~exclude); 2923 else 2924 *got = need; 2925 ceph_take_cap_refs(ci, *got, true); 2926 ret = 1; 2927 } 2928 } else { 2929 int session_readonly = false; 2930 int mds_wanted; 2931 if (ci->i_auth_cap && 2932 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) { 2933 struct ceph_mds_session *s = ci->i_auth_cap->session; 2934 spin_lock(&s->s_cap_lock); 2935 session_readonly = s->s_readonly; 2936 spin_unlock(&s->s_cap_lock); 2937 } 2938 if (session_readonly) { 2939 doutc(cl, "%p %llx.%llx need %s but mds%d readonly\n", 2940 inode, ceph_vinop(inode), ceph_cap_string(need), 2941 ci->i_auth_cap->mds); 2942 ret = -EROFS; 2943 goto out_unlock; 2944 } 2945 2946 if (ceph_inode_is_shutdown(inode)) { 2947 doutc(cl, "%p %llx.%llx inode is shutdown\n", 2948 inode, ceph_vinop(inode)); 2949 ret = -ESTALE; 2950 goto out_unlock; 2951 } 2952 mds_wanted = __ceph_caps_mds_wanted(ci, false); 2953 if (need & ~mds_wanted) { 2954 doutc(cl, "%p %llx.%llx need %s > mds_wanted %s\n", 2955 inode, ceph_vinop(inode), ceph_cap_string(need), 2956 ceph_cap_string(mds_wanted)); 2957 ret = -EUCLEAN; 2958 goto out_unlock; 2959 } 2960 2961 doutc(cl, "%p %llx.%llx have %s need %s\n", inode, 2962 ceph_vinop(inode), ceph_cap_string(have), 2963 ceph_cap_string(need)); 2964 } 2965 out_unlock: 2966 2967 __ceph_touch_fmode(ci, mdsc, flags); 2968 2969 spin_unlock(&ci->i_ceph_lock); 2970 if (snap_rwsem_locked) 2971 up_read(&mdsc->snap_rwsem); 2972 2973 if (!ret) 2974 ceph_update_cap_mis(&mdsc->metric); 2975 else if (ret == 1) 2976 ceph_update_cap_hit(&mdsc->metric); 2977 2978 doutc(cl, "%p %llx.%llx ret %d got %s\n", inode, 2979 ceph_vinop(inode), ret, ceph_cap_string(*got)); 2980 return ret; 2981 } 2982 2983 /* 2984 * Check the offset we are writing up to against our current 2985 * max_size. If necessary, tell the MDS we want to write to 2986 * a larger offset. 2987 */ 2988 static void check_max_size(struct inode *inode, loff_t endoff) 2989 { 2990 struct ceph_inode_info *ci = ceph_inode(inode); 2991 struct ceph_client *cl = ceph_inode_to_client(inode); 2992 int check = 0; 2993 2994 /* do we need to explicitly request a larger max_size? */ 2995 spin_lock(&ci->i_ceph_lock); 2996 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) { 2997 doutc(cl, "write %p %llx.%llx at large endoff %llu, req max_size\n", 2998 inode, ceph_vinop(inode), endoff); 2999 ci->i_wanted_max_size = endoff; 3000 } 3001 /* duplicate ceph_check_caps()'s logic */ 3002 if (ci->i_auth_cap && 3003 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) && 3004 ci->i_wanted_max_size > ci->i_max_size && 3005 ci->i_wanted_max_size > ci->i_requested_max_size) 3006 check = 1; 3007 spin_unlock(&ci->i_ceph_lock); 3008 if (check) 3009 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY); 3010 } 3011 3012 static inline int get_used_fmode(int caps) 3013 { 3014 int fmode = 0; 3015 if (caps & CEPH_CAP_FILE_RD) 3016 fmode |= CEPH_FILE_MODE_RD; 3017 if (caps & CEPH_CAP_FILE_WR) 3018 fmode |= CEPH_FILE_MODE_WR; 3019 return fmode; 3020 } 3021 3022 int ceph_try_get_caps(struct inode *inode, int need, int want, 3023 bool nonblock, int *got) 3024 { 3025 int ret, flags; 3026 3027 BUG_ON(need & ~CEPH_CAP_FILE_RD); 3028 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO | 3029 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | 3030 CEPH_CAP_ANY_DIR_OPS)); 3031 if (need) { 3032 ret = ceph_pool_perm_check(inode, need); 3033 if (ret < 0) 3034 return ret; 3035 } 3036 3037 flags = get_used_fmode(need | want); 3038 if (nonblock) 3039 flags |= NON_BLOCKING; 3040 3041 ret = try_get_cap_refs(inode, need, want, 0, flags, got); 3042 /* three special error codes */ 3043 if (ret == -EAGAIN || ret == -EFBIG || ret == -EUCLEAN) 3044 ret = 0; 3045 return ret; 3046 } 3047 3048 /* 3049 * Wait for caps, and take cap references. If we can't get a WR cap 3050 * due to a small max_size, make sure we check_max_size (and possibly 3051 * ask the mds) so we don't get hung up indefinitely. 3052 */ 3053 int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need, 3054 int want, loff_t endoff, int *got) 3055 { 3056 struct ceph_inode_info *ci = ceph_inode(inode); 3057 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 3058 int ret, _got, flags; 3059 3060 ret = ceph_pool_perm_check(inode, need); 3061 if (ret < 0) 3062 return ret; 3063 3064 if (fi && (fi->fmode & CEPH_FILE_MODE_WR) && 3065 fi->filp_gen != READ_ONCE(fsc->filp_gen)) 3066 return -EBADF; 3067 3068 flags = get_used_fmode(need | want); 3069 3070 while (true) { 3071 flags &= CEPH_FILE_MODE_MASK; 3072 if (vfs_inode_has_locks(inode)) 3073 flags |= CHECK_FILELOCK; 3074 _got = 0; 3075 ret = try_get_cap_refs(inode, need, want, endoff, 3076 flags, &_got); 3077 WARN_ON_ONCE(ret == -EAGAIN); 3078 if (!ret) { 3079 #ifdef CONFIG_DEBUG_FS 3080 struct ceph_mds_client *mdsc = fsc->mdsc; 3081 struct cap_wait cw; 3082 #endif 3083 DEFINE_WAIT_FUNC(wait, woken_wake_function); 3084 3085 #ifdef CONFIG_DEBUG_FS 3086 cw.ino = ceph_ino(inode); 3087 cw.tgid = current->tgid; 3088 cw.need = need; 3089 cw.want = want; 3090 3091 spin_lock(&mdsc->caps_list_lock); 3092 list_add(&cw.list, &mdsc->cap_wait_list); 3093 spin_unlock(&mdsc->caps_list_lock); 3094 #endif 3095 3096 /* make sure used fmode not timeout */ 3097 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS); 3098 add_wait_queue(&ci->i_cap_wq, &wait); 3099 3100 flags |= NON_BLOCKING; 3101 while (!(ret = try_get_cap_refs(inode, need, want, 3102 endoff, flags, &_got))) { 3103 if (signal_pending(current)) { 3104 ret = -ERESTARTSYS; 3105 break; 3106 } 3107 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 3108 } 3109 3110 remove_wait_queue(&ci->i_cap_wq, &wait); 3111 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS); 3112 3113 #ifdef CONFIG_DEBUG_FS 3114 spin_lock(&mdsc->caps_list_lock); 3115 list_del(&cw.list); 3116 spin_unlock(&mdsc->caps_list_lock); 3117 #endif 3118 3119 if (ret == -EAGAIN) 3120 continue; 3121 } 3122 3123 if (fi && (fi->fmode & CEPH_FILE_MODE_WR) && 3124 fi->filp_gen != READ_ONCE(fsc->filp_gen)) { 3125 if (ret >= 0 && _got) 3126 ceph_put_cap_refs(ci, _got); 3127 return -EBADF; 3128 } 3129 3130 if (ret < 0) { 3131 if (ret == -EFBIG || ret == -EUCLEAN) { 3132 int ret2 = ceph_wait_on_async_create(inode); 3133 if (ret2 < 0) 3134 return ret2; 3135 } 3136 if (ret == -EFBIG) { 3137 check_max_size(inode, endoff); 3138 continue; 3139 } 3140 if (ret == -EUCLEAN) { 3141 /* session was killed, try renew caps */ 3142 ret = ceph_renew_caps(inode, flags); 3143 if (ret == 0) 3144 continue; 3145 } 3146 return ret; 3147 } 3148 3149 if (S_ISREG(ci->netfs.inode.i_mode) && 3150 ceph_has_inline_data(ci) && 3151 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && 3152 i_size_read(inode) > 0) { 3153 struct page *page = 3154 find_get_page(inode->i_mapping, 0); 3155 if (page) { 3156 bool uptodate = PageUptodate(page); 3157 3158 put_page(page); 3159 if (uptodate) 3160 break; 3161 } 3162 /* 3163 * drop cap refs first because getattr while 3164 * holding * caps refs can cause deadlock. 3165 */ 3166 ceph_put_cap_refs(ci, _got); 3167 _got = 0; 3168 3169 /* 3170 * getattr request will bring inline data into 3171 * page cache 3172 */ 3173 ret = __ceph_do_getattr(inode, NULL, 3174 CEPH_STAT_CAP_INLINE_DATA, 3175 true); 3176 if (ret < 0) 3177 return ret; 3178 continue; 3179 } 3180 break; 3181 } 3182 *got = _got; 3183 return 0; 3184 } 3185 3186 int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff, 3187 int *got) 3188 { 3189 struct ceph_file_info *fi = filp->private_data; 3190 struct inode *inode = file_inode(filp); 3191 3192 return __ceph_get_caps(inode, fi, need, want, endoff, got); 3193 } 3194 3195 /* 3196 * Take cap refs. Caller must already know we hold at least one ref 3197 * on the caps in question or we don't know this is safe. 3198 */ 3199 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) 3200 { 3201 spin_lock(&ci->i_ceph_lock); 3202 ceph_take_cap_refs(ci, caps, false); 3203 spin_unlock(&ci->i_ceph_lock); 3204 } 3205 3206 3207 /* 3208 * drop cap_snap that is not associated with any snapshot. 3209 * we don't need to send FLUSHSNAP message for it. 3210 */ 3211 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci, 3212 struct ceph_cap_snap *capsnap) 3213 { 3214 struct inode *inode = &ci->netfs.inode; 3215 struct ceph_client *cl = ceph_inode_to_client(inode); 3216 3217 if (!capsnap->need_flush && 3218 !capsnap->writing && !capsnap->dirty_pages) { 3219 doutc(cl, "%p follows %llu\n", capsnap, capsnap->follows); 3220 BUG_ON(capsnap->cap_flush.tid > 0); 3221 ceph_put_snap_context(capsnap->context); 3222 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps)) 3223 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS; 3224 3225 list_del(&capsnap->ci_item); 3226 ceph_put_cap_snap(capsnap); 3227 return 1; 3228 } 3229 return 0; 3230 } 3231 3232 enum put_cap_refs_mode { 3233 PUT_CAP_REFS_SYNC = 0, 3234 PUT_CAP_REFS_ASYNC, 3235 }; 3236 3237 /* 3238 * Release cap refs. 3239 * 3240 * If we released the last ref on any given cap, call ceph_check_caps 3241 * to release (or schedule a release). 3242 * 3243 * If we are releasing a WR cap (from a sync write), finalize any affected 3244 * cap_snap, and wake up any waiters. 3245 */ 3246 static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had, 3247 enum put_cap_refs_mode mode) 3248 { 3249 struct inode *inode = &ci->netfs.inode; 3250 struct ceph_client *cl = ceph_inode_to_client(inode); 3251 int last = 0, put = 0, flushsnaps = 0, wake = 0; 3252 bool check_flushsnaps = false; 3253 3254 spin_lock(&ci->i_ceph_lock); 3255 if (had & CEPH_CAP_PIN) 3256 --ci->i_pin_ref; 3257 if (had & CEPH_CAP_FILE_RD) 3258 if (--ci->i_rd_ref == 0) 3259 last++; 3260 if (had & CEPH_CAP_FILE_CACHE) 3261 if (--ci->i_rdcache_ref == 0) 3262 last++; 3263 if (had & CEPH_CAP_FILE_EXCL) 3264 if (--ci->i_fx_ref == 0) 3265 last++; 3266 if (had & CEPH_CAP_FILE_BUFFER) { 3267 if (--ci->i_wb_ref == 0) { 3268 last++; 3269 /* put the ref held by ceph_take_cap_refs() */ 3270 put++; 3271 check_flushsnaps = true; 3272 } 3273 doutc(cl, "%p %llx.%llx wb %d -> %d (?)\n", inode, 3274 ceph_vinop(inode), ci->i_wb_ref+1, ci->i_wb_ref); 3275 } 3276 if (had & CEPH_CAP_FILE_WR) { 3277 if (--ci->i_wr_ref == 0) { 3278 /* 3279 * The Fb caps will always be took and released 3280 * together with the Fw caps. 3281 */ 3282 WARN_ON_ONCE(ci->i_wb_ref); 3283 3284 last++; 3285 check_flushsnaps = true; 3286 if (ci->i_wrbuffer_ref_head == 0 && 3287 ci->i_dirty_caps == 0 && 3288 ci->i_flushing_caps == 0) { 3289 BUG_ON(!ci->i_head_snapc); 3290 ceph_put_snap_context(ci->i_head_snapc); 3291 ci->i_head_snapc = NULL; 3292 } 3293 /* see comment in __ceph_remove_cap() */ 3294 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm) 3295 ceph_change_snap_realm(inode, NULL); 3296 } 3297 } 3298 if (check_flushsnaps && __ceph_have_pending_cap_snap(ci)) { 3299 struct ceph_cap_snap *capsnap = 3300 list_last_entry(&ci->i_cap_snaps, 3301 struct ceph_cap_snap, 3302 ci_item); 3303 3304 capsnap->writing = 0; 3305 if (ceph_try_drop_cap_snap(ci, capsnap)) 3306 /* put the ref held by ceph_queue_cap_snap() */ 3307 put++; 3308 else if (__ceph_finish_cap_snap(ci, capsnap)) 3309 flushsnaps = 1; 3310 wake = 1; 3311 } 3312 spin_unlock(&ci->i_ceph_lock); 3313 3314 doutc(cl, "%p %llx.%llx had %s%s%s\n", inode, ceph_vinop(inode), 3315 ceph_cap_string(had), last ? " last" : "", put ? " put" : ""); 3316 3317 switch (mode) { 3318 case PUT_CAP_REFS_SYNC: 3319 if (last) 3320 ceph_check_caps(ci, 0); 3321 else if (flushsnaps) 3322 ceph_flush_snaps(ci, NULL); 3323 break; 3324 case PUT_CAP_REFS_ASYNC: 3325 if (last) 3326 ceph_queue_check_caps(inode); 3327 else if (flushsnaps) 3328 ceph_queue_flush_snaps(inode); 3329 break; 3330 default: 3331 break; 3332 } 3333 if (wake) 3334 wake_up_all(&ci->i_cap_wq); 3335 while (put-- > 0) 3336 iput(inode); 3337 } 3338 3339 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) 3340 { 3341 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_SYNC); 3342 } 3343 3344 void ceph_put_cap_refs_async(struct ceph_inode_info *ci, int had) 3345 { 3346 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_ASYNC); 3347 } 3348 3349 /* 3350 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap 3351 * context. Adjust per-snap dirty page accounting as appropriate. 3352 * Once all dirty data for a cap_snap is flushed, flush snapped file 3353 * metadata back to the MDS. If we dropped the last ref, call 3354 * ceph_check_caps. 3355 */ 3356 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 3357 struct ceph_snap_context *snapc) 3358 { 3359 struct inode *inode = &ci->netfs.inode; 3360 struct ceph_client *cl = ceph_inode_to_client(inode); 3361 struct ceph_cap_snap *capsnap = NULL, *iter; 3362 int put = 0; 3363 bool last = false; 3364 bool flush_snaps = false; 3365 bool complete_capsnap = false; 3366 3367 spin_lock(&ci->i_ceph_lock); 3368 ci->i_wrbuffer_ref -= nr; 3369 if (ci->i_wrbuffer_ref == 0) { 3370 last = true; 3371 put++; 3372 } 3373 3374 if (ci->i_head_snapc == snapc) { 3375 ci->i_wrbuffer_ref_head -= nr; 3376 if (ci->i_wrbuffer_ref_head == 0 && 3377 ci->i_wr_ref == 0 && 3378 ci->i_dirty_caps == 0 && 3379 ci->i_flushing_caps == 0) { 3380 BUG_ON(!ci->i_head_snapc); 3381 ceph_put_snap_context(ci->i_head_snapc); 3382 ci->i_head_snapc = NULL; 3383 } 3384 doutc(cl, "on %p %llx.%llx head %d/%d -> %d/%d %s\n", 3385 inode, ceph_vinop(inode), ci->i_wrbuffer_ref+nr, 3386 ci->i_wrbuffer_ref_head+nr, ci->i_wrbuffer_ref, 3387 ci->i_wrbuffer_ref_head, last ? " LAST" : ""); 3388 } else { 3389 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) { 3390 if (iter->context == snapc) { 3391 capsnap = iter; 3392 break; 3393 } 3394 } 3395 3396 if (!capsnap) { 3397 /* 3398 * The capsnap should already be removed when removing 3399 * auth cap in the case of a forced unmount. 3400 */ 3401 WARN_ON_ONCE(ci->i_auth_cap); 3402 goto unlock; 3403 } 3404 3405 capsnap->dirty_pages -= nr; 3406 if (capsnap->dirty_pages == 0) { 3407 complete_capsnap = true; 3408 if (!capsnap->writing) { 3409 if (ceph_try_drop_cap_snap(ci, capsnap)) { 3410 put++; 3411 } else { 3412 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS; 3413 flush_snaps = true; 3414 } 3415 } 3416 } 3417 doutc(cl, "%p %llx.%llx cap_snap %p snap %lld %d/%d -> %d/%d %s%s\n", 3418 inode, ceph_vinop(inode), capsnap, capsnap->context->seq, 3419 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, 3420 ci->i_wrbuffer_ref, capsnap->dirty_pages, 3421 last ? " (wrbuffer last)" : "", 3422 complete_capsnap ? " (complete capsnap)" : ""); 3423 } 3424 3425 unlock: 3426 spin_unlock(&ci->i_ceph_lock); 3427 3428 if (last) { 3429 ceph_check_caps(ci, 0); 3430 } else if (flush_snaps) { 3431 ceph_flush_snaps(ci, NULL); 3432 } 3433 if (complete_capsnap) 3434 wake_up_all(&ci->i_cap_wq); 3435 while (put-- > 0) { 3436 iput(inode); 3437 } 3438 } 3439 3440 /* 3441 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP. 3442 */ 3443 static void invalidate_aliases(struct inode *inode) 3444 { 3445 struct ceph_client *cl = ceph_inode_to_client(inode); 3446 struct dentry *dn, *prev = NULL; 3447 3448 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 3449 d_prune_aliases(inode); 3450 /* 3451 * For non-directory inode, d_find_alias() only returns 3452 * hashed dentry. After calling d_invalidate(), the 3453 * dentry becomes unhashed. 3454 * 3455 * For directory inode, d_find_alias() can return 3456 * unhashed dentry. But directory inode should have 3457 * one alias at most. 3458 */ 3459 while ((dn = d_find_alias(inode))) { 3460 if (dn == prev) { 3461 dput(dn); 3462 break; 3463 } 3464 d_invalidate(dn); 3465 if (prev) 3466 dput(prev); 3467 prev = dn; 3468 } 3469 if (prev) 3470 dput(prev); 3471 } 3472 3473 struct cap_extra_info { 3474 struct ceph_string *pool_ns; 3475 /* inline data */ 3476 u64 inline_version; 3477 void *inline_data; 3478 u32 inline_len; 3479 /* dirstat */ 3480 bool dirstat_valid; 3481 u64 nfiles; 3482 u64 nsubdirs; 3483 u64 change_attr; 3484 /* currently issued */ 3485 int issued; 3486 struct timespec64 btime; 3487 u8 *fscrypt_auth; 3488 u32 fscrypt_auth_len; 3489 u64 fscrypt_file_size; 3490 }; 3491 3492 /* 3493 * Handle a cap GRANT message from the MDS. (Note that a GRANT may 3494 * actually be a revocation if it specifies a smaller cap set.) 3495 * 3496 * caller holds s_mutex and i_ceph_lock, we drop both. 3497 */ 3498 static void handle_cap_grant(struct inode *inode, 3499 struct ceph_mds_session *session, 3500 struct ceph_cap *cap, 3501 struct ceph_mds_caps *grant, 3502 struct ceph_buffer *xattr_buf, 3503 struct cap_extra_info *extra_info) 3504 __releases(ci->i_ceph_lock) 3505 __releases(session->s_mdsc->snap_rwsem) 3506 { 3507 struct ceph_client *cl = ceph_inode_to_client(inode); 3508 struct ceph_inode_info *ci = ceph_inode(inode); 3509 int seq = le32_to_cpu(grant->seq); 3510 int newcaps = le32_to_cpu(grant->caps); 3511 int used, wanted, dirty; 3512 u64 size = le64_to_cpu(grant->size); 3513 u64 max_size = le64_to_cpu(grant->max_size); 3514 unsigned char check_caps = 0; 3515 bool was_stale = cap->cap_gen < atomic_read(&session->s_cap_gen); 3516 bool wake = false; 3517 bool writeback = false; 3518 bool queue_trunc = false; 3519 bool queue_invalidate = false; 3520 bool deleted_inode = false; 3521 bool fill_inline = false; 3522 bool revoke_wait = false; 3523 int flags = 0; 3524 3525 /* 3526 * If there is at least one crypto block then we'll trust 3527 * fscrypt_file_size. If the real length of the file is 0, then 3528 * ignore it (it has probably been truncated down to 0 by the MDS). 3529 */ 3530 if (IS_ENCRYPTED(inode) && size) 3531 size = extra_info->fscrypt_file_size; 3532 3533 doutc(cl, "%p %llx.%llx cap %p mds%d seq %d %s\n", inode, 3534 ceph_vinop(inode), cap, session->s_mds, seq, 3535 ceph_cap_string(newcaps)); 3536 doutc(cl, " size %llu max_size %llu, i_size %llu\n", size, 3537 max_size, i_size_read(inode)); 3538 3539 3540 /* 3541 * If CACHE is being revoked, and we have no dirty buffers, 3542 * try to invalidate (once). (If there are dirty buffers, we 3543 * will invalidate _after_ writeback.) 3544 */ 3545 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */ 3546 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && 3547 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && 3548 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) { 3549 if (try_nonblocking_invalidate(inode)) { 3550 /* there were locked pages.. invalidate later 3551 in a separate thread. */ 3552 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 3553 queue_invalidate = true; 3554 ci->i_rdcache_revoking = ci->i_rdcache_gen; 3555 } 3556 } 3557 } 3558 3559 if (was_stale) 3560 cap->issued = cap->implemented = CEPH_CAP_PIN; 3561 3562 /* 3563 * auth mds of the inode changed. we received the cap export message, 3564 * but still haven't received the cap import message. handle_cap_export 3565 * updated the new auth MDS' cap. 3566 * 3567 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message 3568 * that was sent before the cap import message. So don't remove caps. 3569 */ 3570 if (ceph_seq_cmp(seq, cap->seq) <= 0) { 3571 WARN_ON(cap != ci->i_auth_cap); 3572 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id)); 3573 seq = cap->seq; 3574 newcaps |= cap->issued; 3575 } 3576 3577 /* side effects now are allowed */ 3578 cap->cap_gen = atomic_read(&session->s_cap_gen); 3579 cap->seq = seq; 3580 3581 __check_cap_issue(ci, cap, newcaps); 3582 3583 inode_set_max_iversion_raw(inode, extra_info->change_attr); 3584 3585 if ((newcaps & CEPH_CAP_AUTH_SHARED) && 3586 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) { 3587 umode_t mode = le32_to_cpu(grant->mode); 3588 3589 if (inode_wrong_type(inode, mode)) 3590 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n", 3591 ceph_vinop(inode), inode->i_mode, mode); 3592 else 3593 inode->i_mode = mode; 3594 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid)); 3595 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid)); 3596 ci->i_btime = extra_info->btime; 3597 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode, 3598 ceph_vinop(inode), inode->i_mode, 3599 from_kuid(&init_user_ns, inode->i_uid), 3600 from_kgid(&init_user_ns, inode->i_gid)); 3601 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 3602 if (ci->fscrypt_auth_len != extra_info->fscrypt_auth_len || 3603 memcmp(ci->fscrypt_auth, extra_info->fscrypt_auth, 3604 ci->fscrypt_auth_len)) 3605 pr_warn_ratelimited_client(cl, 3606 "cap grant attempt to change fscrypt_auth on non-I_NEW inode (old len %d new len %d)\n", 3607 ci->fscrypt_auth_len, 3608 extra_info->fscrypt_auth_len); 3609 #endif 3610 } 3611 3612 if ((newcaps & CEPH_CAP_LINK_SHARED) && 3613 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) { 3614 set_nlink(inode, le32_to_cpu(grant->nlink)); 3615 if (inode->i_nlink == 0) 3616 deleted_inode = true; 3617 } 3618 3619 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 && 3620 grant->xattr_len) { 3621 int len = le32_to_cpu(grant->xattr_len); 3622 u64 version = le64_to_cpu(grant->xattr_version); 3623 3624 if (version > ci->i_xattrs.version) { 3625 doutc(cl, " got new xattrs v%llu on %p %llx.%llx len %d\n", 3626 version, inode, ceph_vinop(inode), len); 3627 if (ci->i_xattrs.blob) 3628 ceph_buffer_put(ci->i_xattrs.blob); 3629 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); 3630 ci->i_xattrs.version = version; 3631 ceph_forget_all_cached_acls(inode); 3632 ceph_security_invalidate_secctx(inode); 3633 } 3634 } 3635 3636 if (newcaps & CEPH_CAP_ANY_RD) { 3637 struct timespec64 mtime, atime, ctime; 3638 /* ctime/mtime/atime? */ 3639 ceph_decode_timespec64(&mtime, &grant->mtime); 3640 ceph_decode_timespec64(&atime, &grant->atime); 3641 ceph_decode_timespec64(&ctime, &grant->ctime); 3642 ceph_fill_file_time(inode, extra_info->issued, 3643 le32_to_cpu(grant->time_warp_seq), 3644 &ctime, &mtime, &atime); 3645 } 3646 3647 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) { 3648 ci->i_files = extra_info->nfiles; 3649 ci->i_subdirs = extra_info->nsubdirs; 3650 } 3651 3652 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) { 3653 /* file layout may have changed */ 3654 s64 old_pool = ci->i_layout.pool_id; 3655 struct ceph_string *old_ns; 3656 3657 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout); 3658 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns, 3659 lockdep_is_held(&ci->i_ceph_lock)); 3660 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns); 3661 3662 if (ci->i_layout.pool_id != old_pool || 3663 extra_info->pool_ns != old_ns) 3664 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM; 3665 3666 extra_info->pool_ns = old_ns; 3667 3668 /* size/truncate_seq? */ 3669 queue_trunc = ceph_fill_file_size(inode, extra_info->issued, 3670 le32_to_cpu(grant->truncate_seq), 3671 le64_to_cpu(grant->truncate_size), 3672 size); 3673 } 3674 3675 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) { 3676 if (max_size != ci->i_max_size) { 3677 doutc(cl, "max_size %lld -> %llu\n", ci->i_max_size, 3678 max_size); 3679 ci->i_max_size = max_size; 3680 if (max_size >= ci->i_wanted_max_size) { 3681 ci->i_wanted_max_size = 0; /* reset */ 3682 ci->i_requested_max_size = 0; 3683 } 3684 wake = true; 3685 } 3686 } 3687 3688 /* check cap bits */ 3689 wanted = __ceph_caps_wanted(ci); 3690 used = __ceph_caps_used(ci); 3691 dirty = __ceph_caps_dirty(ci); 3692 doutc(cl, " my wanted = %s, used = %s, dirty %s\n", 3693 ceph_cap_string(wanted), ceph_cap_string(used), 3694 ceph_cap_string(dirty)); 3695 3696 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) && 3697 (wanted & ~(cap->mds_wanted | newcaps))) { 3698 /* 3699 * If mds is importing cap, prior cap messages that update 3700 * 'wanted' may get dropped by mds (migrate seq mismatch). 3701 * 3702 * We don't send cap message to update 'wanted' if what we 3703 * want are already issued. If mds revokes caps, cap message 3704 * that releases caps also tells mds what we want. But if 3705 * caps got revoked by mds forcedly (session stale). We may 3706 * haven't told mds what we want. 3707 */ 3708 check_caps = 1; 3709 } 3710 3711 /* revocation, grant, or no-op? */ 3712 if (cap->issued & ~newcaps) { 3713 int revoking = cap->issued & ~newcaps; 3714 3715 doutc(cl, "revocation: %s -> %s (revoking %s)\n", 3716 ceph_cap_string(cap->issued), ceph_cap_string(newcaps), 3717 ceph_cap_string(revoking)); 3718 if (S_ISREG(inode->i_mode) && 3719 (revoking & used & CEPH_CAP_FILE_BUFFER)) { 3720 writeback = true; /* initiate writeback; will delay ack */ 3721 revoke_wait = true; 3722 } else if (queue_invalidate && 3723 revoking == CEPH_CAP_FILE_CACHE && 3724 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0) { 3725 revoke_wait = true; /* do nothing yet, invalidation will be queued */ 3726 } else if (cap == ci->i_auth_cap) { 3727 check_caps = 1; /* check auth cap only */ 3728 } else { 3729 check_caps = 2; /* check all caps */ 3730 } 3731 /* If there is new caps, try to wake up the waiters */ 3732 if (~cap->issued & newcaps) 3733 wake = true; 3734 cap->issued = newcaps; 3735 cap->implemented |= newcaps; 3736 } else if (cap->issued == newcaps) { 3737 doutc(cl, "caps unchanged: %s -> %s\n", 3738 ceph_cap_string(cap->issued), 3739 ceph_cap_string(newcaps)); 3740 } else { 3741 doutc(cl, "grant: %s -> %s\n", ceph_cap_string(cap->issued), 3742 ceph_cap_string(newcaps)); 3743 /* non-auth MDS is revoking the newly grant caps ? */ 3744 if (cap == ci->i_auth_cap && 3745 __ceph_caps_revoking_other(ci, cap, newcaps)) 3746 check_caps = 2; 3747 3748 cap->issued = newcaps; 3749 cap->implemented |= newcaps; /* add bits only, to 3750 * avoid stepping on a 3751 * pending revocation */ 3752 wake = true; 3753 } 3754 BUG_ON(cap->issued & ~cap->implemented); 3755 3756 /* don't let check_caps skip sending a response to MDS for revoke msgs */ 3757 if (!revoke_wait && le32_to_cpu(grant->op) == CEPH_CAP_OP_REVOKE) { 3758 cap->mds_wanted = 0; 3759 flags |= CHECK_CAPS_FLUSH_FORCE; 3760 if (cap == ci->i_auth_cap) 3761 check_caps = 1; /* check auth cap only */ 3762 else 3763 check_caps = 2; /* check all caps */ 3764 } 3765 3766 if (extra_info->inline_version > 0 && 3767 extra_info->inline_version >= ci->i_inline_version) { 3768 ci->i_inline_version = extra_info->inline_version; 3769 if (ci->i_inline_version != CEPH_INLINE_NONE && 3770 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO))) 3771 fill_inline = true; 3772 } 3773 3774 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) { 3775 if (ci->i_auth_cap == cap) { 3776 if (newcaps & ~extra_info->issued) 3777 wake = true; 3778 3779 if (ci->i_requested_max_size > max_size || 3780 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) { 3781 /* re-request max_size if necessary */ 3782 ci->i_requested_max_size = 0; 3783 wake = true; 3784 } 3785 3786 ceph_kick_flushing_inode_caps(session, ci); 3787 } 3788 up_read(&session->s_mdsc->snap_rwsem); 3789 } 3790 spin_unlock(&ci->i_ceph_lock); 3791 3792 if (fill_inline) 3793 ceph_fill_inline_data(inode, NULL, extra_info->inline_data, 3794 extra_info->inline_len); 3795 3796 if (queue_trunc) 3797 ceph_queue_vmtruncate(inode); 3798 3799 if (writeback) 3800 /* 3801 * queue inode for writeback: we can't actually call 3802 * filemap_write_and_wait, etc. from message handler 3803 * context. 3804 */ 3805 ceph_queue_writeback(inode); 3806 if (queue_invalidate) 3807 ceph_queue_invalidate(inode); 3808 if (deleted_inode) 3809 invalidate_aliases(inode); 3810 if (wake) 3811 wake_up_all(&ci->i_cap_wq); 3812 3813 mutex_unlock(&session->s_mutex); 3814 if (check_caps == 1) 3815 ceph_check_caps(ci, flags | CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL); 3816 else if (check_caps == 2) 3817 ceph_check_caps(ci, flags | CHECK_CAPS_NOINVAL); 3818 } 3819 3820 /* 3821 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the 3822 * MDS has been safely committed. 3823 */ 3824 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, 3825 struct ceph_mds_caps *m, 3826 struct ceph_mds_session *session, 3827 struct ceph_cap *cap) 3828 __releases(ci->i_ceph_lock) 3829 { 3830 struct ceph_inode_info *ci = ceph_inode(inode); 3831 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 3832 struct ceph_client *cl = mdsc->fsc->client; 3833 struct ceph_cap_flush *cf, *tmp_cf; 3834 LIST_HEAD(to_remove); 3835 unsigned seq = le32_to_cpu(m->seq); 3836 int dirty = le32_to_cpu(m->dirty); 3837 int cleaned = 0; 3838 bool drop = false; 3839 bool wake_ci = false; 3840 bool wake_mdsc = false; 3841 3842 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) { 3843 /* Is this the one that was flushed? */ 3844 if (cf->tid == flush_tid) 3845 cleaned = cf->caps; 3846 3847 /* Is this a capsnap? */ 3848 if (cf->is_capsnap) 3849 continue; 3850 3851 if (cf->tid <= flush_tid) { 3852 /* 3853 * An earlier or current tid. The FLUSH_ACK should 3854 * represent a superset of this flush's caps. 3855 */ 3856 wake_ci |= __detach_cap_flush_from_ci(ci, cf); 3857 list_add_tail(&cf->i_list, &to_remove); 3858 } else { 3859 /* 3860 * This is a later one. Any caps in it are still dirty 3861 * so don't count them as cleaned. 3862 */ 3863 cleaned &= ~cf->caps; 3864 if (!cleaned) 3865 break; 3866 } 3867 } 3868 3869 doutc(cl, "%p %llx.%llx mds%d seq %d on %s cleaned %s, flushing %s -> %s\n", 3870 inode, ceph_vinop(inode), session->s_mds, seq, 3871 ceph_cap_string(dirty), ceph_cap_string(cleaned), 3872 ceph_cap_string(ci->i_flushing_caps), 3873 ceph_cap_string(ci->i_flushing_caps & ~cleaned)); 3874 3875 if (list_empty(&to_remove) && !cleaned) 3876 goto out; 3877 3878 ci->i_flushing_caps &= ~cleaned; 3879 3880 spin_lock(&mdsc->cap_dirty_lock); 3881 3882 list_for_each_entry(cf, &to_remove, i_list) 3883 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf); 3884 3885 if (ci->i_flushing_caps == 0) { 3886 if (list_empty(&ci->i_cap_flush_list)) { 3887 list_del_init(&ci->i_flushing_item); 3888 if (!list_empty(&session->s_cap_flushing)) { 3889 struct inode *inode = 3890 &list_first_entry(&session->s_cap_flushing, 3891 struct ceph_inode_info, 3892 i_flushing_item)->netfs.inode; 3893 doutc(cl, " mds%d still flushing cap on %p %llx.%llx\n", 3894 session->s_mds, inode, ceph_vinop(inode)); 3895 } 3896 } 3897 mdsc->num_cap_flushing--; 3898 doutc(cl, " %p %llx.%llx now !flushing\n", inode, 3899 ceph_vinop(inode)); 3900 3901 if (ci->i_dirty_caps == 0) { 3902 doutc(cl, " %p %llx.%llx now clean\n", inode, 3903 ceph_vinop(inode)); 3904 BUG_ON(!list_empty(&ci->i_dirty_item)); 3905 drop = true; 3906 if (ci->i_wr_ref == 0 && 3907 ci->i_wrbuffer_ref_head == 0) { 3908 BUG_ON(!ci->i_head_snapc); 3909 ceph_put_snap_context(ci->i_head_snapc); 3910 ci->i_head_snapc = NULL; 3911 } 3912 } else { 3913 BUG_ON(list_empty(&ci->i_dirty_item)); 3914 } 3915 } 3916 spin_unlock(&mdsc->cap_dirty_lock); 3917 3918 out: 3919 spin_unlock(&ci->i_ceph_lock); 3920 3921 while (!list_empty(&to_remove)) { 3922 cf = list_first_entry(&to_remove, 3923 struct ceph_cap_flush, i_list); 3924 list_del_init(&cf->i_list); 3925 if (!cf->is_capsnap) 3926 ceph_free_cap_flush(cf); 3927 } 3928 3929 if (wake_ci) 3930 wake_up_all(&ci->i_cap_wq); 3931 if (wake_mdsc) 3932 wake_up_all(&mdsc->cap_flushing_wq); 3933 if (drop) 3934 iput(inode); 3935 } 3936 3937 void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, 3938 bool *wake_ci, bool *wake_mdsc) 3939 { 3940 struct ceph_inode_info *ci = ceph_inode(inode); 3941 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 3942 struct ceph_client *cl = mdsc->fsc->client; 3943 bool ret; 3944 3945 lockdep_assert_held(&ci->i_ceph_lock); 3946 3947 doutc(cl, "removing capsnap %p, %p %llx.%llx ci %p\n", capsnap, 3948 inode, ceph_vinop(inode), ci); 3949 3950 list_del_init(&capsnap->ci_item); 3951 ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush); 3952 if (wake_ci) 3953 *wake_ci = ret; 3954 3955 spin_lock(&mdsc->cap_dirty_lock); 3956 if (list_empty(&ci->i_cap_flush_list)) 3957 list_del_init(&ci->i_flushing_item); 3958 3959 ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush); 3960 if (wake_mdsc) 3961 *wake_mdsc = ret; 3962 spin_unlock(&mdsc->cap_dirty_lock); 3963 } 3964 3965 void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, 3966 bool *wake_ci, bool *wake_mdsc) 3967 { 3968 struct ceph_inode_info *ci = ceph_inode(inode); 3969 3970 lockdep_assert_held(&ci->i_ceph_lock); 3971 3972 WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing); 3973 __ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc); 3974 } 3975 3976 /* 3977 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can 3978 * throw away our cap_snap. 3979 * 3980 * Caller hold s_mutex. 3981 */ 3982 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, 3983 struct ceph_mds_caps *m, 3984 struct ceph_mds_session *session) 3985 { 3986 struct ceph_inode_info *ci = ceph_inode(inode); 3987 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 3988 struct ceph_client *cl = mdsc->fsc->client; 3989 u64 follows = le64_to_cpu(m->snap_follows); 3990 struct ceph_cap_snap *capsnap = NULL, *iter; 3991 bool wake_ci = false; 3992 bool wake_mdsc = false; 3993 3994 doutc(cl, "%p %llx.%llx ci %p mds%d follows %lld\n", inode, 3995 ceph_vinop(inode), ci, session->s_mds, follows); 3996 3997 spin_lock(&ci->i_ceph_lock); 3998 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) { 3999 if (iter->follows == follows) { 4000 if (iter->cap_flush.tid != flush_tid) { 4001 doutc(cl, " cap_snap %p follows %lld " 4002 "tid %lld != %lld\n", iter, 4003 follows, flush_tid, 4004 iter->cap_flush.tid); 4005 break; 4006 } 4007 capsnap = iter; 4008 break; 4009 } else { 4010 doutc(cl, " skipping cap_snap %p follows %lld\n", 4011 iter, iter->follows); 4012 } 4013 } 4014 if (capsnap) 4015 ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc); 4016 spin_unlock(&ci->i_ceph_lock); 4017 4018 if (capsnap) { 4019 ceph_put_snap_context(capsnap->context); 4020 ceph_put_cap_snap(capsnap); 4021 if (wake_ci) 4022 wake_up_all(&ci->i_cap_wq); 4023 if (wake_mdsc) 4024 wake_up_all(&mdsc->cap_flushing_wq); 4025 iput(inode); 4026 } 4027 } 4028 4029 /* 4030 * Handle TRUNC from MDS, indicating file truncation. 4031 * 4032 * caller hold s_mutex. 4033 */ 4034 static bool handle_cap_trunc(struct inode *inode, 4035 struct ceph_mds_caps *trunc, 4036 struct ceph_mds_session *session, 4037 struct cap_extra_info *extra_info) 4038 { 4039 struct ceph_inode_info *ci = ceph_inode(inode); 4040 struct ceph_client *cl = ceph_inode_to_client(inode); 4041 int mds = session->s_mds; 4042 int seq = le32_to_cpu(trunc->seq); 4043 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); 4044 u64 truncate_size = le64_to_cpu(trunc->truncate_size); 4045 u64 size = le64_to_cpu(trunc->size); 4046 int implemented = 0; 4047 int dirty = __ceph_caps_dirty(ci); 4048 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); 4049 bool queue_trunc = false; 4050 4051 lockdep_assert_held(&ci->i_ceph_lock); 4052 4053 issued |= implemented | dirty; 4054 4055 /* 4056 * If there is at least one crypto block then we'll trust 4057 * fscrypt_file_size. If the real length of the file is 0, then 4058 * ignore it (it has probably been truncated down to 0 by the MDS). 4059 */ 4060 if (IS_ENCRYPTED(inode) && size) 4061 size = extra_info->fscrypt_file_size; 4062 4063 doutc(cl, "%p %llx.%llx mds%d seq %d to %lld truncate seq %d\n", 4064 inode, ceph_vinop(inode), mds, seq, truncate_size, truncate_seq); 4065 queue_trunc = ceph_fill_file_size(inode, issued, 4066 truncate_seq, truncate_size, size); 4067 return queue_trunc; 4068 } 4069 4070 /* 4071 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a 4072 * different one. If we are the most recent migration we've seen (as 4073 * indicated by mseq), make note of the migrating cap bits for the 4074 * duration (until we see the corresponding IMPORT). 4075 * 4076 * caller holds s_mutex 4077 */ 4078 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 4079 struct ceph_mds_cap_peer *ph, 4080 struct ceph_mds_session *session) 4081 { 4082 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc; 4083 struct ceph_client *cl = mdsc->fsc->client; 4084 struct ceph_mds_session *tsession = NULL; 4085 struct ceph_cap *cap, *tcap, *new_cap = NULL; 4086 struct ceph_inode_info *ci = ceph_inode(inode); 4087 u64 t_cap_id; 4088 unsigned mseq = le32_to_cpu(ex->migrate_seq); 4089 unsigned t_seq, t_mseq; 4090 int target, issued; 4091 int mds = session->s_mds; 4092 4093 if (ph) { 4094 t_cap_id = le64_to_cpu(ph->cap_id); 4095 t_seq = le32_to_cpu(ph->seq); 4096 t_mseq = le32_to_cpu(ph->mseq); 4097 target = le32_to_cpu(ph->mds); 4098 } else { 4099 t_cap_id = t_seq = t_mseq = 0; 4100 target = -1; 4101 } 4102 4103 doutc(cl, "%p %llx.%llx ci %p mds%d mseq %d target %d\n", 4104 inode, ceph_vinop(inode), ci, mds, mseq, target); 4105 retry: 4106 down_read(&mdsc->snap_rwsem); 4107 spin_lock(&ci->i_ceph_lock); 4108 cap = __get_cap_for_mds(ci, mds); 4109 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id)) 4110 goto out_unlock; 4111 4112 if (target < 0) { 4113 ceph_remove_cap(mdsc, cap, false); 4114 goto out_unlock; 4115 } 4116 4117 /* 4118 * now we know we haven't received the cap import message yet 4119 * because the exported cap still exist. 4120 */ 4121 4122 issued = cap->issued; 4123 if (issued != cap->implemented) 4124 pr_err_ratelimited_client(cl, "issued != implemented: " 4125 "%p %llx.%llx mds%d seq %d mseq %d" 4126 " issued %s implemented %s\n", 4127 inode, ceph_vinop(inode), mds, 4128 cap->seq, cap->mseq, 4129 ceph_cap_string(issued), 4130 ceph_cap_string(cap->implemented)); 4131 4132 4133 tcap = __get_cap_for_mds(ci, target); 4134 if (tcap) { 4135 /* already have caps from the target */ 4136 if (tcap->cap_id == t_cap_id && 4137 ceph_seq_cmp(tcap->seq, t_seq) < 0) { 4138 doutc(cl, " updating import cap %p mds%d\n", tcap, 4139 target); 4140 tcap->cap_id = t_cap_id; 4141 tcap->seq = t_seq - 1; 4142 tcap->issue_seq = t_seq - 1; 4143 tcap->issued |= issued; 4144 tcap->implemented |= issued; 4145 if (cap == ci->i_auth_cap) { 4146 ci->i_auth_cap = tcap; 4147 change_auth_cap_ses(ci, tcap->session); 4148 } 4149 } 4150 ceph_remove_cap(mdsc, cap, false); 4151 goto out_unlock; 4152 } else if (tsession) { 4153 /* add placeholder for the export target */ 4154 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0; 4155 tcap = new_cap; 4156 ceph_add_cap(inode, tsession, t_cap_id, issued, 0, 4157 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap); 4158 4159 if (!list_empty(&ci->i_cap_flush_list) && 4160 ci->i_auth_cap == tcap) { 4161 spin_lock(&mdsc->cap_dirty_lock); 4162 list_move_tail(&ci->i_flushing_item, 4163 &tcap->session->s_cap_flushing); 4164 spin_unlock(&mdsc->cap_dirty_lock); 4165 } 4166 4167 ceph_remove_cap(mdsc, cap, false); 4168 goto out_unlock; 4169 } 4170 4171 spin_unlock(&ci->i_ceph_lock); 4172 up_read(&mdsc->snap_rwsem); 4173 mutex_unlock(&session->s_mutex); 4174 4175 /* open target session */ 4176 tsession = ceph_mdsc_open_export_target_session(mdsc, target); 4177 if (!IS_ERR(tsession)) { 4178 if (mds > target) { 4179 mutex_lock(&session->s_mutex); 4180 mutex_lock_nested(&tsession->s_mutex, 4181 SINGLE_DEPTH_NESTING); 4182 } else { 4183 mutex_lock(&tsession->s_mutex); 4184 mutex_lock_nested(&session->s_mutex, 4185 SINGLE_DEPTH_NESTING); 4186 } 4187 new_cap = ceph_get_cap(mdsc, NULL); 4188 } else { 4189 WARN_ON(1); 4190 tsession = NULL; 4191 target = -1; 4192 mutex_lock(&session->s_mutex); 4193 } 4194 goto retry; 4195 4196 out_unlock: 4197 spin_unlock(&ci->i_ceph_lock); 4198 up_read(&mdsc->snap_rwsem); 4199 mutex_unlock(&session->s_mutex); 4200 if (tsession) { 4201 mutex_unlock(&tsession->s_mutex); 4202 ceph_put_mds_session(tsession); 4203 } 4204 if (new_cap) 4205 ceph_put_cap(mdsc, new_cap); 4206 } 4207 4208 /* 4209 * Handle cap IMPORT. 4210 * 4211 * caller holds s_mutex. acquires i_ceph_lock 4212 */ 4213 static void handle_cap_import(struct ceph_mds_client *mdsc, 4214 struct inode *inode, struct ceph_mds_caps *im, 4215 struct ceph_mds_cap_peer *ph, 4216 struct ceph_mds_session *session, 4217 struct ceph_cap **target_cap, int *old_issued) 4218 { 4219 struct ceph_inode_info *ci = ceph_inode(inode); 4220 struct ceph_client *cl = mdsc->fsc->client; 4221 struct ceph_cap *cap, *ocap, *new_cap = NULL; 4222 int mds = session->s_mds; 4223 int issued; 4224 unsigned caps = le32_to_cpu(im->caps); 4225 unsigned wanted = le32_to_cpu(im->wanted); 4226 unsigned seq = le32_to_cpu(im->seq); 4227 unsigned mseq = le32_to_cpu(im->migrate_seq); 4228 u64 realmino = le64_to_cpu(im->realm); 4229 u64 cap_id = le64_to_cpu(im->cap_id); 4230 u64 p_cap_id; 4231 int peer; 4232 4233 if (ph) { 4234 p_cap_id = le64_to_cpu(ph->cap_id); 4235 peer = le32_to_cpu(ph->mds); 4236 } else { 4237 p_cap_id = 0; 4238 peer = -1; 4239 } 4240 4241 doutc(cl, "%p %llx.%llx ci %p mds%d mseq %d peer %d\n", 4242 inode, ceph_vinop(inode), ci, mds, mseq, peer); 4243 retry: 4244 cap = __get_cap_for_mds(ci, mds); 4245 if (!cap) { 4246 if (!new_cap) { 4247 spin_unlock(&ci->i_ceph_lock); 4248 new_cap = ceph_get_cap(mdsc, NULL); 4249 spin_lock(&ci->i_ceph_lock); 4250 goto retry; 4251 } 4252 cap = new_cap; 4253 } else { 4254 if (new_cap) { 4255 ceph_put_cap(mdsc, new_cap); 4256 new_cap = NULL; 4257 } 4258 } 4259 4260 __ceph_caps_issued(ci, &issued); 4261 issued |= __ceph_caps_dirty(ci); 4262 4263 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq, 4264 realmino, CEPH_CAP_FLAG_AUTH, &new_cap); 4265 4266 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL; 4267 if (ocap && ocap->cap_id == p_cap_id) { 4268 doutc(cl, " remove export cap %p mds%d flags %d\n", 4269 ocap, peer, ph->flags); 4270 if ((ph->flags & CEPH_CAP_FLAG_AUTH) && 4271 (ocap->seq != le32_to_cpu(ph->seq) || 4272 ocap->mseq != le32_to_cpu(ph->mseq))) { 4273 pr_err_ratelimited_client(cl, "mismatched seq/mseq: " 4274 "%p %llx.%llx mds%d seq %d mseq %d" 4275 " importer mds%d has peer seq %d mseq %d\n", 4276 inode, ceph_vinop(inode), peer, 4277 ocap->seq, ocap->mseq, mds, 4278 le32_to_cpu(ph->seq), 4279 le32_to_cpu(ph->mseq)); 4280 } 4281 ceph_remove_cap(mdsc, ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE)); 4282 } 4283 4284 *old_issued = issued; 4285 *target_cap = cap; 4286 } 4287 4288 #ifdef CONFIG_FS_ENCRYPTION 4289 static int parse_fscrypt_fields(void **p, void *end, 4290 struct cap_extra_info *extra) 4291 { 4292 u32 len; 4293 4294 ceph_decode_32_safe(p, end, extra->fscrypt_auth_len, bad); 4295 if (extra->fscrypt_auth_len) { 4296 ceph_decode_need(p, end, extra->fscrypt_auth_len, bad); 4297 extra->fscrypt_auth = kmalloc(extra->fscrypt_auth_len, 4298 GFP_KERNEL); 4299 if (!extra->fscrypt_auth) 4300 return -ENOMEM; 4301 ceph_decode_copy_safe(p, end, extra->fscrypt_auth, 4302 extra->fscrypt_auth_len, bad); 4303 } 4304 4305 ceph_decode_32_safe(p, end, len, bad); 4306 if (len >= sizeof(u64)) { 4307 ceph_decode_64_safe(p, end, extra->fscrypt_file_size, bad); 4308 len -= sizeof(u64); 4309 } 4310 ceph_decode_skip_n(p, end, len, bad); 4311 return 0; 4312 bad: 4313 return -EIO; 4314 } 4315 #else 4316 static int parse_fscrypt_fields(void **p, void *end, 4317 struct cap_extra_info *extra) 4318 { 4319 u32 len; 4320 4321 /* Don't care about these fields unless we're encryption-capable */ 4322 ceph_decode_32_safe(p, end, len, bad); 4323 if (len) 4324 ceph_decode_skip_n(p, end, len, bad); 4325 ceph_decode_32_safe(p, end, len, bad); 4326 if (len) 4327 ceph_decode_skip_n(p, end, len, bad); 4328 return 0; 4329 bad: 4330 return -EIO; 4331 } 4332 #endif 4333 4334 /* 4335 * Handle a caps message from the MDS. 4336 * 4337 * Identify the appropriate session, inode, and call the right handler 4338 * based on the cap op. 4339 */ 4340 void ceph_handle_caps(struct ceph_mds_session *session, 4341 struct ceph_msg *msg) 4342 { 4343 struct ceph_mds_client *mdsc = session->s_mdsc; 4344 struct ceph_client *cl = mdsc->fsc->client; 4345 struct inode *inode; 4346 struct ceph_inode_info *ci; 4347 struct ceph_cap *cap; 4348 struct ceph_mds_caps *h; 4349 struct ceph_mds_cap_peer *peer = NULL; 4350 struct ceph_snap_realm *realm = NULL; 4351 int op; 4352 int msg_version = le16_to_cpu(msg->hdr.version); 4353 u32 seq, mseq; 4354 struct ceph_vino vino; 4355 void *snaptrace; 4356 size_t snaptrace_len; 4357 void *p, *end; 4358 struct cap_extra_info extra_info = {}; 4359 bool queue_trunc; 4360 bool close_sessions = false; 4361 bool do_cap_release = false; 4362 4363 doutc(cl, "from mds%d\n", session->s_mds); 4364 4365 if (!ceph_inc_mds_stopping_blocker(mdsc, session)) 4366 return; 4367 4368 /* decode */ 4369 end = msg->front.iov_base + msg->front.iov_len; 4370 if (msg->front.iov_len < sizeof(*h)) 4371 goto bad; 4372 h = msg->front.iov_base; 4373 op = le32_to_cpu(h->op); 4374 vino.ino = le64_to_cpu(h->ino); 4375 vino.snap = CEPH_NOSNAP; 4376 seq = le32_to_cpu(h->seq); 4377 mseq = le32_to_cpu(h->migrate_seq); 4378 4379 snaptrace = h + 1; 4380 snaptrace_len = le32_to_cpu(h->snap_trace_len); 4381 p = snaptrace + snaptrace_len; 4382 4383 if (msg_version >= 2) { 4384 u32 flock_len; 4385 ceph_decode_32_safe(&p, end, flock_len, bad); 4386 if (p + flock_len > end) 4387 goto bad; 4388 p += flock_len; 4389 } 4390 4391 if (msg_version >= 3) { 4392 if (op == CEPH_CAP_OP_IMPORT) { 4393 if (p + sizeof(*peer) > end) 4394 goto bad; 4395 peer = p; 4396 p += sizeof(*peer); 4397 } else if (op == CEPH_CAP_OP_EXPORT) { 4398 /* recorded in unused fields */ 4399 peer = (void *)&h->size; 4400 } 4401 } 4402 4403 if (msg_version >= 4) { 4404 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad); 4405 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad); 4406 if (p + extra_info.inline_len > end) 4407 goto bad; 4408 extra_info.inline_data = p; 4409 p += extra_info.inline_len; 4410 } 4411 4412 if (msg_version >= 5) { 4413 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; 4414 u32 epoch_barrier; 4415 4416 ceph_decode_32_safe(&p, end, epoch_barrier, bad); 4417 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier); 4418 } 4419 4420 if (msg_version >= 8) { 4421 u32 pool_ns_len; 4422 4423 /* version >= 6 */ 4424 ceph_decode_skip_64(&p, end, bad); // flush_tid 4425 /* version >= 7 */ 4426 ceph_decode_skip_32(&p, end, bad); // caller_uid 4427 ceph_decode_skip_32(&p, end, bad); // caller_gid 4428 /* version >= 8 */ 4429 ceph_decode_32_safe(&p, end, pool_ns_len, bad); 4430 if (pool_ns_len > 0) { 4431 ceph_decode_need(&p, end, pool_ns_len, bad); 4432 extra_info.pool_ns = 4433 ceph_find_or_create_string(p, pool_ns_len); 4434 p += pool_ns_len; 4435 } 4436 } 4437 4438 if (msg_version >= 9) { 4439 struct ceph_timespec *btime; 4440 4441 if (p + sizeof(*btime) > end) 4442 goto bad; 4443 btime = p; 4444 ceph_decode_timespec64(&extra_info.btime, btime); 4445 p += sizeof(*btime); 4446 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad); 4447 } 4448 4449 if (msg_version >= 11) { 4450 /* version >= 10 */ 4451 ceph_decode_skip_32(&p, end, bad); // flags 4452 /* version >= 11 */ 4453 extra_info.dirstat_valid = true; 4454 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad); 4455 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad); 4456 } 4457 4458 if (msg_version >= 12) { 4459 if (parse_fscrypt_fields(&p, end, &extra_info)) 4460 goto bad; 4461 } 4462 4463 /* lookup ino */ 4464 inode = ceph_find_inode(mdsc->fsc->sb, vino); 4465 doutc(cl, " op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), 4466 vino.ino, vino.snap, inode); 4467 4468 mutex_lock(&session->s_mutex); 4469 doutc(cl, " mds%d seq %lld cap seq %u\n", session->s_mds, 4470 session->s_seq, (unsigned)seq); 4471 4472 if (!inode) { 4473 doutc(cl, " i don't have ino %llx\n", vino.ino); 4474 4475 switch (op) { 4476 case CEPH_CAP_OP_IMPORT: 4477 case CEPH_CAP_OP_REVOKE: 4478 case CEPH_CAP_OP_GRANT: 4479 do_cap_release = true; 4480 break; 4481 default: 4482 break; 4483 } 4484 goto flush_cap_releases; 4485 } 4486 ci = ceph_inode(inode); 4487 4488 /* these will work even if we don't have a cap yet */ 4489 switch (op) { 4490 case CEPH_CAP_OP_FLUSHSNAP_ACK: 4491 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid), 4492 h, session); 4493 goto done; 4494 4495 case CEPH_CAP_OP_EXPORT: 4496 handle_cap_export(inode, h, peer, session); 4497 goto done_unlocked; 4498 4499 case CEPH_CAP_OP_IMPORT: 4500 realm = NULL; 4501 if (snaptrace_len) { 4502 down_write(&mdsc->snap_rwsem); 4503 if (ceph_update_snap_trace(mdsc, snaptrace, 4504 snaptrace + snaptrace_len, 4505 false, &realm)) { 4506 up_write(&mdsc->snap_rwsem); 4507 close_sessions = true; 4508 goto done; 4509 } 4510 downgrade_write(&mdsc->snap_rwsem); 4511 } else { 4512 down_read(&mdsc->snap_rwsem); 4513 } 4514 spin_lock(&ci->i_ceph_lock); 4515 handle_cap_import(mdsc, inode, h, peer, session, 4516 &cap, &extra_info.issued); 4517 handle_cap_grant(inode, session, cap, 4518 h, msg->middle, &extra_info); 4519 if (realm) 4520 ceph_put_snap_realm(mdsc, realm); 4521 goto done_unlocked; 4522 } 4523 4524 /* the rest require a cap */ 4525 spin_lock(&ci->i_ceph_lock); 4526 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds); 4527 if (!cap) { 4528 doutc(cl, " no cap on %p ino %llx.%llx from mds%d\n", 4529 inode, ceph_ino(inode), ceph_snap(inode), 4530 session->s_mds); 4531 spin_unlock(&ci->i_ceph_lock); 4532 switch (op) { 4533 case CEPH_CAP_OP_REVOKE: 4534 case CEPH_CAP_OP_GRANT: 4535 do_cap_release = true; 4536 break; 4537 default: 4538 break; 4539 } 4540 goto flush_cap_releases; 4541 } 4542 4543 /* note that each of these drops i_ceph_lock for us */ 4544 switch (op) { 4545 case CEPH_CAP_OP_REVOKE: 4546 case CEPH_CAP_OP_GRANT: 4547 __ceph_caps_issued(ci, &extra_info.issued); 4548 extra_info.issued |= __ceph_caps_dirty(ci); 4549 handle_cap_grant(inode, session, cap, 4550 h, msg->middle, &extra_info); 4551 goto done_unlocked; 4552 4553 case CEPH_CAP_OP_FLUSH_ACK: 4554 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid), 4555 h, session, cap); 4556 break; 4557 4558 case CEPH_CAP_OP_TRUNC: 4559 queue_trunc = handle_cap_trunc(inode, h, session, 4560 &extra_info); 4561 spin_unlock(&ci->i_ceph_lock); 4562 if (queue_trunc) 4563 ceph_queue_vmtruncate(inode); 4564 break; 4565 4566 default: 4567 spin_unlock(&ci->i_ceph_lock); 4568 pr_err_client(cl, "unknown cap op %d %s\n", op, 4569 ceph_cap_op_name(op)); 4570 } 4571 4572 done: 4573 mutex_unlock(&session->s_mutex); 4574 done_unlocked: 4575 iput(inode); 4576 out: 4577 ceph_dec_mds_stopping_blocker(mdsc); 4578 4579 ceph_put_string(extra_info.pool_ns); 4580 4581 /* Defer closing the sessions after s_mutex lock being released */ 4582 if (close_sessions) 4583 ceph_mdsc_close_sessions(mdsc); 4584 4585 kfree(extra_info.fscrypt_auth); 4586 return; 4587 4588 flush_cap_releases: 4589 /* 4590 * send any cap release message to try to move things 4591 * along for the mds (who clearly thinks we still have this 4592 * cap). 4593 */ 4594 if (do_cap_release) { 4595 cap = ceph_get_cap(mdsc, NULL); 4596 cap->cap_ino = vino.ino; 4597 cap->queue_release = 1; 4598 cap->cap_id = le64_to_cpu(h->cap_id); 4599 cap->mseq = mseq; 4600 cap->seq = seq; 4601 cap->issue_seq = seq; 4602 spin_lock(&session->s_cap_lock); 4603 __ceph_queue_cap_release(session, cap); 4604 spin_unlock(&session->s_cap_lock); 4605 } 4606 ceph_flush_session_cap_releases(mdsc, session); 4607 goto done; 4608 4609 bad: 4610 pr_err_client(cl, "corrupt message\n"); 4611 ceph_msg_dump(msg); 4612 goto out; 4613 } 4614 4615 /* 4616 * Delayed work handler to process end of delayed cap release LRU list. 4617 * 4618 * If new caps are added to the list while processing it, these won't get 4619 * processed in this run. In this case, the ci->i_hold_caps_max will be 4620 * returned so that the work can be scheduled accordingly. 4621 */ 4622 unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc) 4623 { 4624 struct ceph_client *cl = mdsc->fsc->client; 4625 struct inode *inode; 4626 struct ceph_inode_info *ci; 4627 struct ceph_mount_options *opt = mdsc->fsc->mount_options; 4628 unsigned long delay_max = opt->caps_wanted_delay_max * HZ; 4629 unsigned long loop_start = jiffies; 4630 unsigned long delay = 0; 4631 4632 doutc(cl, "begin\n"); 4633 spin_lock(&mdsc->cap_delay_lock); 4634 while (!list_empty(&mdsc->cap_delay_list)) { 4635 ci = list_first_entry(&mdsc->cap_delay_list, 4636 struct ceph_inode_info, 4637 i_cap_delay_list); 4638 if (time_before(loop_start, ci->i_hold_caps_max - delay_max)) { 4639 doutc(cl, "caps added recently. Exiting loop"); 4640 delay = ci->i_hold_caps_max; 4641 break; 4642 } 4643 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && 4644 time_before(jiffies, ci->i_hold_caps_max)) 4645 break; 4646 list_del_init(&ci->i_cap_delay_list); 4647 4648 inode = igrab(&ci->netfs.inode); 4649 if (inode) { 4650 spin_unlock(&mdsc->cap_delay_lock); 4651 doutc(cl, "on %p %llx.%llx\n", inode, 4652 ceph_vinop(inode)); 4653 ceph_check_caps(ci, 0); 4654 iput(inode); 4655 spin_lock(&mdsc->cap_delay_lock); 4656 } 4657 4658 /* 4659 * Make sure too many dirty caps or general 4660 * slowness doesn't block mdsc delayed work, 4661 * preventing send_renew_caps() from running. 4662 */ 4663 if (time_after_eq(jiffies, loop_start + 5 * HZ)) 4664 break; 4665 } 4666 spin_unlock(&mdsc->cap_delay_lock); 4667 doutc(cl, "done\n"); 4668 4669 return delay; 4670 } 4671 4672 /* 4673 * Flush all dirty caps to the mds 4674 */ 4675 static void flush_dirty_session_caps(struct ceph_mds_session *s) 4676 { 4677 struct ceph_mds_client *mdsc = s->s_mdsc; 4678 struct ceph_client *cl = mdsc->fsc->client; 4679 struct ceph_inode_info *ci; 4680 struct inode *inode; 4681 4682 doutc(cl, "begin\n"); 4683 spin_lock(&mdsc->cap_dirty_lock); 4684 while (!list_empty(&s->s_cap_dirty)) { 4685 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info, 4686 i_dirty_item); 4687 inode = &ci->netfs.inode; 4688 ihold(inode); 4689 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 4690 spin_unlock(&mdsc->cap_dirty_lock); 4691 ceph_wait_on_async_create(inode); 4692 ceph_check_caps(ci, CHECK_CAPS_FLUSH); 4693 iput(inode); 4694 spin_lock(&mdsc->cap_dirty_lock); 4695 } 4696 spin_unlock(&mdsc->cap_dirty_lock); 4697 doutc(cl, "done\n"); 4698 } 4699 4700 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) 4701 { 4702 ceph_mdsc_iterate_sessions(mdsc, flush_dirty_session_caps, true); 4703 } 4704 4705 /* 4706 * Flush all cap releases to the mds 4707 */ 4708 static void flush_cap_releases(struct ceph_mds_session *s) 4709 { 4710 struct ceph_mds_client *mdsc = s->s_mdsc; 4711 struct ceph_client *cl = mdsc->fsc->client; 4712 4713 doutc(cl, "begin\n"); 4714 spin_lock(&s->s_cap_lock); 4715 if (s->s_num_cap_releases) 4716 ceph_flush_session_cap_releases(mdsc, s); 4717 spin_unlock(&s->s_cap_lock); 4718 doutc(cl, "done\n"); 4719 4720 } 4721 4722 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc) 4723 { 4724 ceph_mdsc_iterate_sessions(mdsc, flush_cap_releases, true); 4725 } 4726 4727 void __ceph_touch_fmode(struct ceph_inode_info *ci, 4728 struct ceph_mds_client *mdsc, int fmode) 4729 { 4730 unsigned long now = jiffies; 4731 if (fmode & CEPH_FILE_MODE_RD) 4732 ci->i_last_rd = now; 4733 if (fmode & CEPH_FILE_MODE_WR) 4734 ci->i_last_wr = now; 4735 /* queue periodic check */ 4736 if (fmode && 4737 __ceph_is_any_real_caps(ci) && 4738 list_empty(&ci->i_cap_delay_list)) 4739 __cap_delay_requeue(mdsc, ci); 4740 } 4741 4742 void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count) 4743 { 4744 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb); 4745 int bits = (fmode << 1) | 1; 4746 bool already_opened = false; 4747 int i; 4748 4749 if (count == 1) 4750 atomic64_inc(&mdsc->metric.opened_files); 4751 4752 spin_lock(&ci->i_ceph_lock); 4753 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) { 4754 /* 4755 * If any of the mode ref is larger than 0, 4756 * that means it has been already opened by 4757 * others. Just skip checking the PIN ref. 4758 */ 4759 if (i && ci->i_nr_by_mode[i]) 4760 already_opened = true; 4761 4762 if (bits & (1 << i)) 4763 ci->i_nr_by_mode[i] += count; 4764 } 4765 4766 if (!already_opened) 4767 percpu_counter_inc(&mdsc->metric.opened_inodes); 4768 spin_unlock(&ci->i_ceph_lock); 4769 } 4770 4771 /* 4772 * Drop open file reference. If we were the last open file, 4773 * we may need to release capabilities to the MDS (or schedule 4774 * their delayed release). 4775 */ 4776 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count) 4777 { 4778 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb); 4779 int bits = (fmode << 1) | 1; 4780 bool is_closed = true; 4781 int i; 4782 4783 if (count == 1) 4784 atomic64_dec(&mdsc->metric.opened_files); 4785 4786 spin_lock(&ci->i_ceph_lock); 4787 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) { 4788 if (bits & (1 << i)) { 4789 BUG_ON(ci->i_nr_by_mode[i] < count); 4790 ci->i_nr_by_mode[i] -= count; 4791 } 4792 4793 /* 4794 * If any of the mode ref is not 0 after 4795 * decreased, that means it is still opened 4796 * by others. Just skip checking the PIN ref. 4797 */ 4798 if (i && ci->i_nr_by_mode[i]) 4799 is_closed = false; 4800 } 4801 4802 if (is_closed) 4803 percpu_counter_dec(&mdsc->metric.opened_inodes); 4804 spin_unlock(&ci->i_ceph_lock); 4805 } 4806 4807 /* 4808 * For a soon-to-be unlinked file, drop the LINK caps. If it 4809 * looks like the link count will hit 0, drop any other caps (other 4810 * than PIN) we don't specifically want (due to the file still being 4811 * open). 4812 */ 4813 int ceph_drop_caps_for_unlink(struct inode *inode) 4814 { 4815 struct ceph_inode_info *ci = ceph_inode(inode); 4816 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 4817 4818 spin_lock(&ci->i_ceph_lock); 4819 if (inode->i_nlink == 1) { 4820 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); 4821 4822 if (__ceph_caps_dirty(ci)) { 4823 struct ceph_mds_client *mdsc = 4824 ceph_inode_to_fs_client(inode)->mdsc; 4825 4826 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode, 4827 ceph_vinop(inode)); 4828 spin_lock(&mdsc->cap_delay_lock); 4829 ci->i_ceph_flags |= CEPH_I_FLUSH; 4830 if (!list_empty(&ci->i_cap_delay_list)) 4831 list_del_init(&ci->i_cap_delay_list); 4832 list_add_tail(&ci->i_cap_delay_list, 4833 &mdsc->cap_unlink_delay_list); 4834 spin_unlock(&mdsc->cap_delay_lock); 4835 4836 /* 4837 * Fire the work immediately, because the MDS maybe 4838 * waiting for caps release. 4839 */ 4840 ceph_queue_cap_unlink_work(mdsc); 4841 } 4842 } 4843 spin_unlock(&ci->i_ceph_lock); 4844 return drop; 4845 } 4846 4847 /* 4848 * Helpers for embedding cap and dentry lease releases into mds 4849 * requests. 4850 * 4851 * @force is used by dentry_release (below) to force inclusion of a 4852 * record for the directory inode, even when there aren't any caps to 4853 * drop. 4854 */ 4855 int ceph_encode_inode_release(void **p, struct inode *inode, 4856 int mds, int drop, int unless, int force) 4857 { 4858 struct ceph_inode_info *ci = ceph_inode(inode); 4859 struct ceph_client *cl = ceph_inode_to_client(inode); 4860 struct ceph_cap *cap; 4861 struct ceph_mds_request_release *rel = *p; 4862 int used, dirty; 4863 int ret = 0; 4864 4865 spin_lock(&ci->i_ceph_lock); 4866 used = __ceph_caps_used(ci); 4867 dirty = __ceph_caps_dirty(ci); 4868 4869 doutc(cl, "%p %llx.%llx mds%d used|dirty %s drop %s unless %s\n", 4870 inode, ceph_vinop(inode), mds, ceph_cap_string(used|dirty), 4871 ceph_cap_string(drop), ceph_cap_string(unless)); 4872 4873 /* only drop unused, clean caps */ 4874 drop &= ~(used | dirty); 4875 4876 cap = __get_cap_for_mds(ci, mds); 4877 if (cap && __cap_is_valid(cap)) { 4878 unless &= cap->issued; 4879 if (unless) { 4880 if (unless & CEPH_CAP_AUTH_EXCL) 4881 drop &= ~CEPH_CAP_AUTH_SHARED; 4882 if (unless & CEPH_CAP_LINK_EXCL) 4883 drop &= ~CEPH_CAP_LINK_SHARED; 4884 if (unless & CEPH_CAP_XATTR_EXCL) 4885 drop &= ~CEPH_CAP_XATTR_SHARED; 4886 if (unless & CEPH_CAP_FILE_EXCL) 4887 drop &= ~CEPH_CAP_FILE_SHARED; 4888 } 4889 4890 if (force || (cap->issued & drop)) { 4891 if (cap->issued & drop) { 4892 int wanted = __ceph_caps_wanted(ci); 4893 doutc(cl, "%p %llx.%llx cap %p %s -> %s, " 4894 "wanted %s -> %s\n", inode, 4895 ceph_vinop(inode), cap, 4896 ceph_cap_string(cap->issued), 4897 ceph_cap_string(cap->issued & ~drop), 4898 ceph_cap_string(cap->mds_wanted), 4899 ceph_cap_string(wanted)); 4900 4901 cap->issued &= ~drop; 4902 cap->implemented &= ~drop; 4903 cap->mds_wanted = wanted; 4904 if (cap == ci->i_auth_cap && 4905 !(wanted & CEPH_CAP_ANY_FILE_WR)) 4906 ci->i_requested_max_size = 0; 4907 } else { 4908 doutc(cl, "%p %llx.%llx cap %p %s (force)\n", 4909 inode, ceph_vinop(inode), cap, 4910 ceph_cap_string(cap->issued)); 4911 } 4912 4913 rel->ino = cpu_to_le64(ceph_ino(inode)); 4914 rel->cap_id = cpu_to_le64(cap->cap_id); 4915 rel->seq = cpu_to_le32(cap->seq); 4916 rel->issue_seq = cpu_to_le32(cap->issue_seq); 4917 rel->mseq = cpu_to_le32(cap->mseq); 4918 rel->caps = cpu_to_le32(cap->implemented); 4919 rel->wanted = cpu_to_le32(cap->mds_wanted); 4920 rel->dname_len = 0; 4921 rel->dname_seq = 0; 4922 *p += sizeof(*rel); 4923 ret = 1; 4924 } else { 4925 doutc(cl, "%p %llx.%llx cap %p %s (noop)\n", 4926 inode, ceph_vinop(inode), cap, 4927 ceph_cap_string(cap->issued)); 4928 } 4929 } 4930 spin_unlock(&ci->i_ceph_lock); 4931 return ret; 4932 } 4933 4934 /** 4935 * ceph_encode_dentry_release - encode a dentry release into an outgoing request 4936 * @p: outgoing request buffer 4937 * @dentry: dentry to release 4938 * @dir: dir to release it from 4939 * @mds: mds that we're speaking to 4940 * @drop: caps being dropped 4941 * @unless: unless we have these caps 4942 * 4943 * Encode a dentry release into an outgoing request buffer. Returns 1 if the 4944 * thing was released, or a negative error code otherwise. 4945 */ 4946 int ceph_encode_dentry_release(void **p, struct dentry *dentry, 4947 struct inode *dir, 4948 int mds, int drop, int unless) 4949 { 4950 struct ceph_mds_request_release *rel = *p; 4951 struct ceph_dentry_info *di = ceph_dentry(dentry); 4952 struct ceph_client *cl; 4953 int force = 0; 4954 int ret; 4955 4956 /* This shouldn't happen */ 4957 BUG_ON(!dir); 4958 4959 /* 4960 * force an record for the directory caps if we have a dentry lease. 4961 * this is racy (can't take i_ceph_lock and d_lock together), but it 4962 * doesn't have to be perfect; the mds will revoke anything we don't 4963 * release. 4964 */ 4965 spin_lock(&dentry->d_lock); 4966 if (di->lease_session && di->lease_session->s_mds == mds) 4967 force = 1; 4968 spin_unlock(&dentry->d_lock); 4969 4970 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); 4971 4972 cl = ceph_inode_to_client(dir); 4973 spin_lock(&dentry->d_lock); 4974 if (ret && di->lease_session && di->lease_session->s_mds == mds) { 4975 doutc(cl, "%p mds%d seq %d\n", dentry, mds, 4976 (int)di->lease_seq); 4977 rel->dname_seq = cpu_to_le32(di->lease_seq); 4978 __ceph_mdsc_drop_dentry_lease(dentry); 4979 spin_unlock(&dentry->d_lock); 4980 if (IS_ENCRYPTED(dir) && fscrypt_has_encryption_key(dir)) { 4981 int ret2 = ceph_encode_encrypted_fname(dir, dentry, *p); 4982 4983 if (ret2 < 0) 4984 return ret2; 4985 4986 rel->dname_len = cpu_to_le32(ret2); 4987 *p += ret2; 4988 } else { 4989 rel->dname_len = cpu_to_le32(dentry->d_name.len); 4990 memcpy(*p, dentry->d_name.name, dentry->d_name.len); 4991 *p += dentry->d_name.len; 4992 } 4993 } else { 4994 spin_unlock(&dentry->d_lock); 4995 } 4996 return ret; 4997 } 4998 4999 static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode) 5000 { 5001 struct ceph_inode_info *ci = ceph_inode(inode); 5002 struct ceph_client *cl = mdsc->fsc->client; 5003 struct ceph_cap_snap *capsnap; 5004 int capsnap_release = 0; 5005 5006 lockdep_assert_held(&ci->i_ceph_lock); 5007 5008 doutc(cl, "removing capsnaps, ci is %p, %p %llx.%llx\n", 5009 ci, inode, ceph_vinop(inode)); 5010 5011 while (!list_empty(&ci->i_cap_snaps)) { 5012 capsnap = list_first_entry(&ci->i_cap_snaps, 5013 struct ceph_cap_snap, ci_item); 5014 __ceph_remove_capsnap(inode, capsnap, NULL, NULL); 5015 ceph_put_snap_context(capsnap->context); 5016 ceph_put_cap_snap(capsnap); 5017 capsnap_release++; 5018 } 5019 wake_up_all(&ci->i_cap_wq); 5020 wake_up_all(&mdsc->cap_flushing_wq); 5021 return capsnap_release; 5022 } 5023 5024 int ceph_purge_inode_cap(struct inode *inode, struct ceph_cap *cap, bool *invalidate) 5025 { 5026 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 5027 struct ceph_mds_client *mdsc = fsc->mdsc; 5028 struct ceph_client *cl = fsc->client; 5029 struct ceph_inode_info *ci = ceph_inode(inode); 5030 bool is_auth; 5031 bool dirty_dropped = false; 5032 int iputs = 0; 5033 5034 lockdep_assert_held(&ci->i_ceph_lock); 5035 5036 doutc(cl, "removing cap %p, ci is %p, %p %llx.%llx\n", 5037 cap, ci, inode, ceph_vinop(inode)); 5038 5039 is_auth = (cap == ci->i_auth_cap); 5040 __ceph_remove_cap(cap, false); 5041 if (is_auth) { 5042 struct ceph_cap_flush *cf; 5043 5044 if (ceph_inode_is_shutdown(inode)) { 5045 if (inode->i_data.nrpages > 0) 5046 *invalidate = true; 5047 if (ci->i_wrbuffer_ref > 0) 5048 mapping_set_error(&inode->i_data, -EIO); 5049 } 5050 5051 spin_lock(&mdsc->cap_dirty_lock); 5052 5053 /* trash all of the cap flushes for this inode */ 5054 while (!list_empty(&ci->i_cap_flush_list)) { 5055 cf = list_first_entry(&ci->i_cap_flush_list, 5056 struct ceph_cap_flush, i_list); 5057 list_del_init(&cf->g_list); 5058 list_del_init(&cf->i_list); 5059 if (!cf->is_capsnap) 5060 ceph_free_cap_flush(cf); 5061 } 5062 5063 if (!list_empty(&ci->i_dirty_item)) { 5064 pr_warn_ratelimited_client(cl, 5065 " dropping dirty %s state for %p %llx.%llx\n", 5066 ceph_cap_string(ci->i_dirty_caps), 5067 inode, ceph_vinop(inode)); 5068 ci->i_dirty_caps = 0; 5069 list_del_init(&ci->i_dirty_item); 5070 dirty_dropped = true; 5071 } 5072 if (!list_empty(&ci->i_flushing_item)) { 5073 pr_warn_ratelimited_client(cl, 5074 " dropping dirty+flushing %s state for %p %llx.%llx\n", 5075 ceph_cap_string(ci->i_flushing_caps), 5076 inode, ceph_vinop(inode)); 5077 ci->i_flushing_caps = 0; 5078 list_del_init(&ci->i_flushing_item); 5079 mdsc->num_cap_flushing--; 5080 dirty_dropped = true; 5081 } 5082 spin_unlock(&mdsc->cap_dirty_lock); 5083 5084 if (dirty_dropped) { 5085 mapping_set_error(inode->i_mapping, -EIO); 5086 5087 if (ci->i_wrbuffer_ref_head == 0 && 5088 ci->i_wr_ref == 0 && 5089 ci->i_dirty_caps == 0 && 5090 ci->i_flushing_caps == 0) { 5091 ceph_put_snap_context(ci->i_head_snapc); 5092 ci->i_head_snapc = NULL; 5093 } 5094 } 5095 5096 if (atomic_read(&ci->i_filelock_ref) > 0) { 5097 /* make further file lock syscall return -EIO */ 5098 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK; 5099 pr_warn_ratelimited_client(cl, 5100 " dropping file locks for %p %llx.%llx\n", 5101 inode, ceph_vinop(inode)); 5102 } 5103 5104 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) { 5105 cf = ci->i_prealloc_cap_flush; 5106 ci->i_prealloc_cap_flush = NULL; 5107 if (!cf->is_capsnap) 5108 ceph_free_cap_flush(cf); 5109 } 5110 5111 if (!list_empty(&ci->i_cap_snaps)) 5112 iputs = remove_capsnaps(mdsc, inode); 5113 } 5114 if (dirty_dropped) 5115 ++iputs; 5116 return iputs; 5117 } 5118