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