1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/fs.h> 4 #include <linux/kernel.h> 5 #include <linux/sched.h> 6 #include <linux/slab.h> 7 #include <linux/vmalloc.h> 8 #include <linux/wait.h> 9 #include <linux/writeback.h> 10 11 #include "super.h" 12 #include "mds_client.h" 13 #include <linux/ceph/decode.h> 14 #include <linux/ceph/messenger.h> 15 16 /* 17 * Capability management 18 * 19 * The Ceph metadata servers control client access to inode metadata 20 * and file data by issuing capabilities, granting clients permission 21 * to read and/or write both inode field and file data to OSDs 22 * (storage nodes). Each capability consists of a set of bits 23 * indicating which operations are allowed. 24 * 25 * If the client holds a *_SHARED cap, the client has a coherent value 26 * that can be safely read from the cached inode. 27 * 28 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the 29 * client is allowed to change inode attributes (e.g., file size, 30 * mtime), note its dirty state in the ceph_cap, and asynchronously 31 * flush that metadata change to the MDS. 32 * 33 * In the event of a conflicting operation (perhaps by another 34 * client), the MDS will revoke the conflicting client capabilities. 35 * 36 * In order for a client to cache an inode, it must hold a capability 37 * with at least one MDS server. When inodes are released, release 38 * notifications are batched and periodically sent en masse to the MDS 39 * cluster to release server state. 40 */ 41 42 43 /* 44 * Generate readable cap strings for debugging output. 45 */ 46 #define MAX_CAP_STR 20 47 static char cap_str[MAX_CAP_STR][40]; 48 static DEFINE_SPINLOCK(cap_str_lock); 49 static int last_cap_str; 50 51 static char *gcap_string(char *s, int c) 52 { 53 if (c & CEPH_CAP_GSHARED) 54 *s++ = 's'; 55 if (c & CEPH_CAP_GEXCL) 56 *s++ = 'x'; 57 if (c & CEPH_CAP_GCACHE) 58 *s++ = 'c'; 59 if (c & CEPH_CAP_GRD) 60 *s++ = 'r'; 61 if (c & CEPH_CAP_GWR) 62 *s++ = 'w'; 63 if (c & CEPH_CAP_GBUFFER) 64 *s++ = 'b'; 65 if (c & CEPH_CAP_GLAZYIO) 66 *s++ = 'l'; 67 return s; 68 } 69 70 const char *ceph_cap_string(int caps) 71 { 72 int i; 73 char *s; 74 int c; 75 76 spin_lock(&cap_str_lock); 77 i = last_cap_str++; 78 if (last_cap_str == MAX_CAP_STR) 79 last_cap_str = 0; 80 spin_unlock(&cap_str_lock); 81 82 s = cap_str[i]; 83 84 if (caps & CEPH_CAP_PIN) 85 *s++ = 'p'; 86 87 c = (caps >> CEPH_CAP_SAUTH) & 3; 88 if (c) { 89 *s++ = 'A'; 90 s = gcap_string(s, c); 91 } 92 93 c = (caps >> CEPH_CAP_SLINK) & 3; 94 if (c) { 95 *s++ = 'L'; 96 s = gcap_string(s, c); 97 } 98 99 c = (caps >> CEPH_CAP_SXATTR) & 3; 100 if (c) { 101 *s++ = 'X'; 102 s = gcap_string(s, c); 103 } 104 105 c = caps >> CEPH_CAP_SFILE; 106 if (c) { 107 *s++ = 'F'; 108 s = gcap_string(s, c); 109 } 110 111 if (s == cap_str[i]) 112 *s++ = '-'; 113 *s = 0; 114 return cap_str[i]; 115 } 116 117 void ceph_caps_init(struct ceph_mds_client *mdsc) 118 { 119 INIT_LIST_HEAD(&mdsc->caps_list); 120 spin_lock_init(&mdsc->caps_list_lock); 121 } 122 123 void ceph_caps_finalize(struct ceph_mds_client *mdsc) 124 { 125 struct ceph_cap *cap; 126 127 spin_lock(&mdsc->caps_list_lock); 128 while (!list_empty(&mdsc->caps_list)) { 129 cap = list_first_entry(&mdsc->caps_list, 130 struct ceph_cap, caps_item); 131 list_del(&cap->caps_item); 132 kmem_cache_free(ceph_cap_cachep, cap); 133 } 134 mdsc->caps_total_count = 0; 135 mdsc->caps_avail_count = 0; 136 mdsc->caps_use_count = 0; 137 mdsc->caps_reserve_count = 0; 138 mdsc->caps_min_count = 0; 139 spin_unlock(&mdsc->caps_list_lock); 140 } 141 142 void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta) 143 { 144 spin_lock(&mdsc->caps_list_lock); 145 mdsc->caps_min_count += delta; 146 BUG_ON(mdsc->caps_min_count < 0); 147 spin_unlock(&mdsc->caps_list_lock); 148 } 149 150 void ceph_reserve_caps(struct ceph_mds_client *mdsc, 151 struct ceph_cap_reservation *ctx, int need) 152 { 153 int i; 154 struct ceph_cap *cap; 155 int have; 156 int alloc = 0; 157 LIST_HEAD(newcaps); 158 159 dout("reserve caps ctx=%p need=%d\n", ctx, need); 160 161 /* first reserve any caps that are already allocated */ 162 spin_lock(&mdsc->caps_list_lock); 163 if (mdsc->caps_avail_count >= need) 164 have = need; 165 else 166 have = mdsc->caps_avail_count; 167 mdsc->caps_avail_count -= have; 168 mdsc->caps_reserve_count += have; 169 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 170 mdsc->caps_reserve_count + 171 mdsc->caps_avail_count); 172 spin_unlock(&mdsc->caps_list_lock); 173 174 for (i = have; i < need; i++) { 175 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); 176 if (!cap) 177 break; 178 list_add(&cap->caps_item, &newcaps); 179 alloc++; 180 } 181 /* we didn't manage to reserve as much as we needed */ 182 if (have + alloc != need) 183 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n", 184 ctx, need, have + alloc); 185 186 spin_lock(&mdsc->caps_list_lock); 187 mdsc->caps_total_count += alloc; 188 mdsc->caps_reserve_count += alloc; 189 list_splice(&newcaps, &mdsc->caps_list); 190 191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 192 mdsc->caps_reserve_count + 193 mdsc->caps_avail_count); 194 spin_unlock(&mdsc->caps_list_lock); 195 196 ctx->count = need; 197 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", 198 ctx, mdsc->caps_total_count, mdsc->caps_use_count, 199 mdsc->caps_reserve_count, mdsc->caps_avail_count); 200 } 201 202 int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 203 struct ceph_cap_reservation *ctx) 204 { 205 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count); 206 if (ctx->count) { 207 spin_lock(&mdsc->caps_list_lock); 208 BUG_ON(mdsc->caps_reserve_count < ctx->count); 209 mdsc->caps_reserve_count -= ctx->count; 210 mdsc->caps_avail_count += ctx->count; 211 ctx->count = 0; 212 dout("unreserve caps %d = %d used + %d resv + %d avail\n", 213 mdsc->caps_total_count, mdsc->caps_use_count, 214 mdsc->caps_reserve_count, mdsc->caps_avail_count); 215 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 216 mdsc->caps_reserve_count + 217 mdsc->caps_avail_count); 218 spin_unlock(&mdsc->caps_list_lock); 219 } 220 return 0; 221 } 222 223 static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc, 224 struct ceph_cap_reservation *ctx) 225 { 226 struct ceph_cap *cap = NULL; 227 228 /* temporary, until we do something about cap import/export */ 229 if (!ctx) { 230 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); 231 if (cap) { 232 spin_lock(&mdsc->caps_list_lock); 233 mdsc->caps_use_count++; 234 mdsc->caps_total_count++; 235 spin_unlock(&mdsc->caps_list_lock); 236 } 237 return cap; 238 } 239 240 spin_lock(&mdsc->caps_list_lock); 241 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n", 242 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, 243 mdsc->caps_reserve_count, mdsc->caps_avail_count); 244 BUG_ON(!ctx->count); 245 BUG_ON(ctx->count > mdsc->caps_reserve_count); 246 BUG_ON(list_empty(&mdsc->caps_list)); 247 248 ctx->count--; 249 mdsc->caps_reserve_count--; 250 mdsc->caps_use_count++; 251 252 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); 253 list_del(&cap->caps_item); 254 255 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 256 mdsc->caps_reserve_count + mdsc->caps_avail_count); 257 spin_unlock(&mdsc->caps_list_lock); 258 return cap; 259 } 260 261 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) 262 { 263 spin_lock(&mdsc->caps_list_lock); 264 dout("put_cap %p %d = %d used + %d resv + %d avail\n", 265 cap, mdsc->caps_total_count, mdsc->caps_use_count, 266 mdsc->caps_reserve_count, mdsc->caps_avail_count); 267 mdsc->caps_use_count--; 268 /* 269 * Keep some preallocated caps around (ceph_min_count), to 270 * avoid lots of free/alloc churn. 271 */ 272 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + 273 mdsc->caps_min_count) { 274 mdsc->caps_total_count--; 275 kmem_cache_free(ceph_cap_cachep, cap); 276 } else { 277 mdsc->caps_avail_count++; 278 list_add(&cap->caps_item, &mdsc->caps_list); 279 } 280 281 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + 282 mdsc->caps_reserve_count + mdsc->caps_avail_count); 283 spin_unlock(&mdsc->caps_list_lock); 284 } 285 286 void ceph_reservation_status(struct ceph_fs_client *fsc, 287 int *total, int *avail, int *used, int *reserved, 288 int *min) 289 { 290 struct ceph_mds_client *mdsc = fsc->mdsc; 291 292 if (total) 293 *total = mdsc->caps_total_count; 294 if (avail) 295 *avail = mdsc->caps_avail_count; 296 if (used) 297 *used = mdsc->caps_use_count; 298 if (reserved) 299 *reserved = mdsc->caps_reserve_count; 300 if (min) 301 *min = mdsc->caps_min_count; 302 } 303 304 /* 305 * Find ceph_cap for given mds, if any. 306 * 307 * Called with i_ceph_lock held. 308 */ 309 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) 310 { 311 struct ceph_cap *cap; 312 struct rb_node *n = ci->i_caps.rb_node; 313 314 while (n) { 315 cap = rb_entry(n, struct ceph_cap, ci_node); 316 if (mds < cap->mds) 317 n = n->rb_left; 318 else if (mds > cap->mds) 319 n = n->rb_right; 320 else 321 return cap; 322 } 323 return NULL; 324 } 325 326 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) 327 { 328 struct ceph_cap *cap; 329 330 spin_lock(&ci->i_ceph_lock); 331 cap = __get_cap_for_mds(ci, mds); 332 spin_unlock(&ci->i_ceph_lock); 333 return cap; 334 } 335 336 /* 337 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1. 338 */ 339 static int __ceph_get_cap_mds(struct ceph_inode_info *ci) 340 { 341 struct ceph_cap *cap; 342 int mds = -1; 343 struct rb_node *p; 344 345 /* prefer mds with WR|BUFFER|EXCL caps */ 346 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 347 cap = rb_entry(p, struct ceph_cap, ci_node); 348 mds = cap->mds; 349 if (cap->issued & (CEPH_CAP_FILE_WR | 350 CEPH_CAP_FILE_BUFFER | 351 CEPH_CAP_FILE_EXCL)) 352 break; 353 } 354 return mds; 355 } 356 357 int ceph_get_cap_mds(struct inode *inode) 358 { 359 struct ceph_inode_info *ci = ceph_inode(inode); 360 int mds; 361 spin_lock(&ci->i_ceph_lock); 362 mds = __ceph_get_cap_mds(ceph_inode(inode)); 363 spin_unlock(&ci->i_ceph_lock); 364 return mds; 365 } 366 367 /* 368 * Called under i_ceph_lock. 369 */ 370 static void __insert_cap_node(struct ceph_inode_info *ci, 371 struct ceph_cap *new) 372 { 373 struct rb_node **p = &ci->i_caps.rb_node; 374 struct rb_node *parent = NULL; 375 struct ceph_cap *cap = NULL; 376 377 while (*p) { 378 parent = *p; 379 cap = rb_entry(parent, struct ceph_cap, ci_node); 380 if (new->mds < cap->mds) 381 p = &(*p)->rb_left; 382 else if (new->mds > cap->mds) 383 p = &(*p)->rb_right; 384 else 385 BUG(); 386 } 387 388 rb_link_node(&new->ci_node, parent, p); 389 rb_insert_color(&new->ci_node, &ci->i_caps); 390 } 391 392 /* 393 * (re)set cap hold timeouts, which control the delayed release 394 * of unused caps back to the MDS. Should be called on cap use. 395 */ 396 static void __cap_set_timeouts(struct ceph_mds_client *mdsc, 397 struct ceph_inode_info *ci) 398 { 399 struct ceph_mount_options *ma = mdsc->fsc->mount_options; 400 401 ci->i_hold_caps_min = round_jiffies(jiffies + 402 ma->caps_wanted_delay_min * HZ); 403 ci->i_hold_caps_max = round_jiffies(jiffies + 404 ma->caps_wanted_delay_max * HZ); 405 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode, 406 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies); 407 } 408 409 /* 410 * (Re)queue cap at the end of the delayed cap release list. 411 * 412 * If I_FLUSH is set, leave the inode at the front of the list. 413 * 414 * Caller holds i_ceph_lock 415 * -> we take mdsc->cap_delay_lock 416 */ 417 static void __cap_delay_requeue(struct ceph_mds_client *mdsc, 418 struct ceph_inode_info *ci) 419 { 420 __cap_set_timeouts(mdsc, ci); 421 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode, 422 ci->i_ceph_flags, ci->i_hold_caps_max); 423 if (!mdsc->stopping) { 424 spin_lock(&mdsc->cap_delay_lock); 425 if (!list_empty(&ci->i_cap_delay_list)) { 426 if (ci->i_ceph_flags & CEPH_I_FLUSH) 427 goto no_change; 428 list_del_init(&ci->i_cap_delay_list); 429 } 430 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); 431 no_change: 432 spin_unlock(&mdsc->cap_delay_lock); 433 } 434 } 435 436 /* 437 * Queue an inode for immediate writeback. Mark inode with I_FLUSH, 438 * indicating we should send a cap message to flush dirty metadata 439 * asap, and move to the front of the delayed cap list. 440 */ 441 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, 442 struct ceph_inode_info *ci) 443 { 444 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode); 445 spin_lock(&mdsc->cap_delay_lock); 446 ci->i_ceph_flags |= CEPH_I_FLUSH; 447 if (!list_empty(&ci->i_cap_delay_list)) 448 list_del_init(&ci->i_cap_delay_list); 449 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); 450 spin_unlock(&mdsc->cap_delay_lock); 451 } 452 453 /* 454 * Cancel delayed work on cap. 455 * 456 * Caller must hold i_ceph_lock. 457 */ 458 static void __cap_delay_cancel(struct ceph_mds_client *mdsc, 459 struct ceph_inode_info *ci) 460 { 461 dout("__cap_delay_cancel %p\n", &ci->vfs_inode); 462 if (list_empty(&ci->i_cap_delay_list)) 463 return; 464 spin_lock(&mdsc->cap_delay_lock); 465 list_del_init(&ci->i_cap_delay_list); 466 spin_unlock(&mdsc->cap_delay_lock); 467 } 468 469 /* 470 * Common issue checks for add_cap, handle_cap_grant. 471 */ 472 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, 473 unsigned issued) 474 { 475 unsigned had = __ceph_caps_issued(ci, NULL); 476 477 /* 478 * Each time we receive FILE_CACHE anew, we increment 479 * i_rdcache_gen. 480 */ 481 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && 482 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) 483 ci->i_rdcache_gen++; 484 485 /* 486 * if we are newly issued FILE_SHARED, mark dir not complete; we 487 * don't know what happened to this directory while we didn't 488 * have the cap. 489 */ 490 if ((issued & CEPH_CAP_FILE_SHARED) && 491 (had & CEPH_CAP_FILE_SHARED) == 0) { 492 ci->i_shared_gen++; 493 if (S_ISDIR(ci->vfs_inode.i_mode)) { 494 dout(" marking %p NOT complete\n", &ci->vfs_inode); 495 __ceph_dir_clear_complete(ci); 496 } 497 } 498 } 499 500 /* 501 * Add a capability under the given MDS session. 502 * 503 * Caller should hold session snap_rwsem (read) and s_mutex. 504 * 505 * @fmode is the open file mode, if we are opening a file, otherwise 506 * it is < 0. (This is so we can atomically add the cap and add an 507 * open file reference to it.) 508 */ 509 int ceph_add_cap(struct inode *inode, 510 struct ceph_mds_session *session, u64 cap_id, 511 int fmode, unsigned issued, unsigned wanted, 512 unsigned seq, unsigned mseq, u64 realmino, int flags, 513 struct ceph_cap_reservation *caps_reservation) 514 { 515 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 516 struct ceph_inode_info *ci = ceph_inode(inode); 517 struct ceph_cap *new_cap = NULL; 518 struct ceph_cap *cap; 519 int mds = session->s_mds; 520 int actual_wanted; 521 522 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode, 523 session->s_mds, cap_id, ceph_cap_string(issued), seq); 524 525 /* 526 * If we are opening the file, include file mode wanted bits 527 * in wanted. 528 */ 529 if (fmode >= 0) 530 wanted |= ceph_caps_for_mode(fmode); 531 532 retry: 533 spin_lock(&ci->i_ceph_lock); 534 cap = __get_cap_for_mds(ci, mds); 535 if (!cap) { 536 if (new_cap) { 537 cap = new_cap; 538 new_cap = NULL; 539 } else { 540 spin_unlock(&ci->i_ceph_lock); 541 new_cap = get_cap(mdsc, caps_reservation); 542 if (new_cap == NULL) 543 return -ENOMEM; 544 goto retry; 545 } 546 547 cap->issued = 0; 548 cap->implemented = 0; 549 cap->mds = mds; 550 cap->mds_wanted = 0; 551 cap->mseq = 0; 552 553 cap->ci = ci; 554 __insert_cap_node(ci, cap); 555 556 /* clear out old exporting info? (i.e. on cap import) */ 557 if (ci->i_cap_exporting_mds == mds) { 558 ci->i_cap_exporting_issued = 0; 559 ci->i_cap_exporting_mseq = 0; 560 ci->i_cap_exporting_mds = -1; 561 } 562 563 /* add to session cap list */ 564 cap->session = session; 565 spin_lock(&session->s_cap_lock); 566 list_add_tail(&cap->session_caps, &session->s_caps); 567 session->s_nr_caps++; 568 spin_unlock(&session->s_cap_lock); 569 } else if (new_cap) 570 ceph_put_cap(mdsc, new_cap); 571 572 if (!ci->i_snap_realm) { 573 /* 574 * add this inode to the appropriate snap realm 575 */ 576 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, 577 realmino); 578 if (realm) { 579 ceph_get_snap_realm(mdsc, realm); 580 spin_lock(&realm->inodes_with_caps_lock); 581 ci->i_snap_realm = realm; 582 list_add(&ci->i_snap_realm_item, 583 &realm->inodes_with_caps); 584 spin_unlock(&realm->inodes_with_caps_lock); 585 } else { 586 pr_err("ceph_add_cap: couldn't find snap realm %llx\n", 587 realmino); 588 WARN_ON(!realm); 589 } 590 } 591 592 __check_cap_issue(ci, cap, issued); 593 594 /* 595 * If we are issued caps we don't want, or the mds' wanted 596 * value appears to be off, queue a check so we'll release 597 * later and/or update the mds wanted value. 598 */ 599 actual_wanted = __ceph_caps_wanted(ci); 600 if ((wanted & ~actual_wanted) || 601 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { 602 dout(" issued %s, mds wanted %s, actual %s, queueing\n", 603 ceph_cap_string(issued), ceph_cap_string(wanted), 604 ceph_cap_string(actual_wanted)); 605 __cap_delay_requeue(mdsc, ci); 606 } 607 608 if (flags & CEPH_CAP_FLAG_AUTH) { 609 if (ci->i_auth_cap == NULL || 610 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) 611 ci->i_auth_cap = cap; 612 } else if (ci->i_auth_cap == cap) { 613 ci->i_auth_cap = NULL; 614 spin_lock(&mdsc->cap_dirty_lock); 615 if (!list_empty(&ci->i_dirty_item)) { 616 dout(" moving %p to cap_dirty_migrating\n", inode); 617 list_move(&ci->i_dirty_item, 618 &mdsc->cap_dirty_migrating); 619 } 620 spin_unlock(&mdsc->cap_dirty_lock); 621 } 622 623 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n", 624 inode, ceph_vinop(inode), cap, ceph_cap_string(issued), 625 ceph_cap_string(issued|cap->issued), seq, mds); 626 cap->cap_id = cap_id; 627 cap->issued = issued; 628 cap->implemented |= issued; 629 if (mseq > cap->mseq) 630 cap->mds_wanted = wanted; 631 else 632 cap->mds_wanted |= wanted; 633 cap->seq = seq; 634 cap->issue_seq = seq; 635 cap->mseq = mseq; 636 cap->cap_gen = session->s_cap_gen; 637 638 if (fmode >= 0) 639 __ceph_get_fmode(ci, fmode); 640 spin_unlock(&ci->i_ceph_lock); 641 wake_up_all(&ci->i_cap_wq); 642 return 0; 643 } 644 645 /* 646 * Return true if cap has not timed out and belongs to the current 647 * generation of the MDS session (i.e. has not gone 'stale' due to 648 * us losing touch with the mds). 649 */ 650 static int __cap_is_valid(struct ceph_cap *cap) 651 { 652 unsigned long ttl; 653 u32 gen; 654 655 spin_lock(&cap->session->s_gen_ttl_lock); 656 gen = cap->session->s_cap_gen; 657 ttl = cap->session->s_cap_ttl; 658 spin_unlock(&cap->session->s_gen_ttl_lock); 659 660 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { 661 dout("__cap_is_valid %p cap %p issued %s " 662 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode, 663 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen); 664 return 0; 665 } 666 667 return 1; 668 } 669 670 /* 671 * Return set of valid cap bits issued to us. Note that caps time 672 * out, and may be invalidated in bulk if the client session times out 673 * and session->s_cap_gen is bumped. 674 */ 675 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) 676 { 677 int have = ci->i_snap_caps | ci->i_cap_exporting_issued; 678 struct ceph_cap *cap; 679 struct rb_node *p; 680 681 if (implemented) 682 *implemented = 0; 683 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 684 cap = rb_entry(p, struct ceph_cap, ci_node); 685 if (!__cap_is_valid(cap)) 686 continue; 687 dout("__ceph_caps_issued %p cap %p issued %s\n", 688 &ci->vfs_inode, cap, ceph_cap_string(cap->issued)); 689 have |= cap->issued; 690 if (implemented) 691 *implemented |= cap->implemented; 692 } 693 /* 694 * exclude caps issued by non-auth MDS, but are been revoking 695 * by the auth MDS. The non-auth MDS should be revoking/exporting 696 * these caps, but the message is delayed. 697 */ 698 if (ci->i_auth_cap) { 699 cap = ci->i_auth_cap; 700 have &= ~cap->implemented | cap->issued; 701 } 702 return have; 703 } 704 705 /* 706 * Get cap bits issued by caps other than @ocap 707 */ 708 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) 709 { 710 int have = ci->i_snap_caps; 711 struct ceph_cap *cap; 712 struct rb_node *p; 713 714 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 715 cap = rb_entry(p, struct ceph_cap, ci_node); 716 if (cap == ocap) 717 continue; 718 if (!__cap_is_valid(cap)) 719 continue; 720 have |= cap->issued; 721 } 722 return have; 723 } 724 725 /* 726 * Move a cap to the end of the LRU (oldest caps at list head, newest 727 * at list tail). 728 */ 729 static void __touch_cap(struct ceph_cap *cap) 730 { 731 struct ceph_mds_session *s = cap->session; 732 733 spin_lock(&s->s_cap_lock); 734 if (s->s_cap_iterator == NULL) { 735 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, 736 s->s_mds); 737 list_move_tail(&cap->session_caps, &s->s_caps); 738 } else { 739 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", 740 &cap->ci->vfs_inode, cap, s->s_mds); 741 } 742 spin_unlock(&s->s_cap_lock); 743 } 744 745 /* 746 * Check if we hold the given mask. If so, move the cap(s) to the 747 * front of their respective LRUs. (This is the preferred way for 748 * callers to check for caps they want.) 749 */ 750 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) 751 { 752 struct ceph_cap *cap; 753 struct rb_node *p; 754 int have = ci->i_snap_caps; 755 756 if ((have & mask) == mask) { 757 dout("__ceph_caps_issued_mask %p snap issued %s" 758 " (mask %s)\n", &ci->vfs_inode, 759 ceph_cap_string(have), 760 ceph_cap_string(mask)); 761 return 1; 762 } 763 764 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 765 cap = rb_entry(p, struct ceph_cap, ci_node); 766 if (!__cap_is_valid(cap)) 767 continue; 768 if ((cap->issued & mask) == mask) { 769 dout("__ceph_caps_issued_mask %p cap %p issued %s" 770 " (mask %s)\n", &ci->vfs_inode, cap, 771 ceph_cap_string(cap->issued), 772 ceph_cap_string(mask)); 773 if (touch) 774 __touch_cap(cap); 775 return 1; 776 } 777 778 /* does a combination of caps satisfy mask? */ 779 have |= cap->issued; 780 if ((have & mask) == mask) { 781 dout("__ceph_caps_issued_mask %p combo issued %s" 782 " (mask %s)\n", &ci->vfs_inode, 783 ceph_cap_string(cap->issued), 784 ceph_cap_string(mask)); 785 if (touch) { 786 struct rb_node *q; 787 788 /* touch this + preceding caps */ 789 __touch_cap(cap); 790 for (q = rb_first(&ci->i_caps); q != p; 791 q = rb_next(q)) { 792 cap = rb_entry(q, struct ceph_cap, 793 ci_node); 794 if (!__cap_is_valid(cap)) 795 continue; 796 __touch_cap(cap); 797 } 798 } 799 return 1; 800 } 801 } 802 803 return 0; 804 } 805 806 /* 807 * Return true if mask caps are currently being revoked by an MDS. 808 */ 809 int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 810 struct ceph_cap *ocap, int mask) 811 { 812 struct ceph_cap *cap; 813 struct rb_node *p; 814 815 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 816 cap = rb_entry(p, struct ceph_cap, ci_node); 817 if (cap != ocap && __cap_is_valid(cap) && 818 (cap->implemented & ~cap->issued & mask)) 819 return 1; 820 } 821 return 0; 822 } 823 824 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) 825 { 826 struct inode *inode = &ci->vfs_inode; 827 int ret; 828 829 spin_lock(&ci->i_ceph_lock); 830 ret = __ceph_caps_revoking_other(ci, NULL, mask); 831 spin_unlock(&ci->i_ceph_lock); 832 dout("ceph_caps_revoking %p %s = %d\n", inode, 833 ceph_cap_string(mask), ret); 834 return ret; 835 } 836 837 int __ceph_caps_used(struct ceph_inode_info *ci) 838 { 839 int used = 0; 840 if (ci->i_pin_ref) 841 used |= CEPH_CAP_PIN; 842 if (ci->i_rd_ref) 843 used |= CEPH_CAP_FILE_RD; 844 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages) 845 used |= CEPH_CAP_FILE_CACHE; 846 if (ci->i_wr_ref) 847 used |= CEPH_CAP_FILE_WR; 848 if (ci->i_wb_ref || ci->i_wrbuffer_ref) 849 used |= CEPH_CAP_FILE_BUFFER; 850 return used; 851 } 852 853 /* 854 * wanted, by virtue of open file modes 855 */ 856 int __ceph_caps_file_wanted(struct ceph_inode_info *ci) 857 { 858 int want = 0; 859 int mode; 860 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++) 861 if (ci->i_nr_by_mode[mode]) 862 want |= ceph_caps_for_mode(mode); 863 return want; 864 } 865 866 /* 867 * Return caps we have registered with the MDS(s) as 'wanted'. 868 */ 869 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci) 870 { 871 struct ceph_cap *cap; 872 struct rb_node *p; 873 int mds_wanted = 0; 874 875 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 876 cap = rb_entry(p, struct ceph_cap, ci_node); 877 if (!__cap_is_valid(cap)) 878 continue; 879 mds_wanted |= cap->mds_wanted; 880 } 881 return mds_wanted; 882 } 883 884 /* 885 * called under i_ceph_lock 886 */ 887 static int __ceph_is_any_caps(struct ceph_inode_info *ci) 888 { 889 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0; 890 } 891 892 /* 893 * Remove a cap. Take steps to deal with a racing iterate_session_caps. 894 * 895 * caller should hold i_ceph_lock. 896 * caller will not hold session s_mutex if called from destroy_inode. 897 */ 898 void __ceph_remove_cap(struct ceph_cap *cap) 899 { 900 struct ceph_mds_session *session = cap->session; 901 struct ceph_inode_info *ci = cap->ci; 902 struct ceph_mds_client *mdsc = 903 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 904 int removed = 0; 905 906 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode); 907 908 /* remove from session list */ 909 spin_lock(&session->s_cap_lock); 910 if (session->s_cap_iterator == cap) { 911 /* not yet, we are iterating over this very cap */ 912 dout("__ceph_remove_cap delaying %p removal from session %p\n", 913 cap, cap->session); 914 } else { 915 list_del_init(&cap->session_caps); 916 session->s_nr_caps--; 917 cap->session = NULL; 918 removed = 1; 919 } 920 /* protect backpointer with s_cap_lock: see iterate_session_caps */ 921 cap->ci = NULL; 922 spin_unlock(&session->s_cap_lock); 923 924 /* remove from inode list */ 925 rb_erase(&cap->ci_node, &ci->i_caps); 926 if (ci->i_auth_cap == cap) 927 ci->i_auth_cap = NULL; 928 929 if (removed) 930 ceph_put_cap(mdsc, cap); 931 932 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) { 933 struct ceph_snap_realm *realm = ci->i_snap_realm; 934 spin_lock(&realm->inodes_with_caps_lock); 935 list_del_init(&ci->i_snap_realm_item); 936 ci->i_snap_realm_counter++; 937 ci->i_snap_realm = NULL; 938 spin_unlock(&realm->inodes_with_caps_lock); 939 ceph_put_snap_realm(mdsc, realm); 940 } 941 if (!__ceph_is_any_real_caps(ci)) 942 __cap_delay_cancel(mdsc, ci); 943 } 944 945 /* 946 * Build and send a cap message to the given MDS. 947 * 948 * Caller should be holding s_mutex. 949 */ 950 static int send_cap_msg(struct ceph_mds_session *session, 951 u64 ino, u64 cid, int op, 952 int caps, int wanted, int dirty, 953 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq, 954 u64 size, u64 max_size, 955 struct timespec *mtime, struct timespec *atime, 956 u64 time_warp_seq, 957 kuid_t uid, kgid_t gid, umode_t mode, 958 u64 xattr_version, 959 struct ceph_buffer *xattrs_buf, 960 u64 follows) 961 { 962 struct ceph_mds_caps *fc; 963 struct ceph_msg *msg; 964 965 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s" 966 " seq %u/%u mseq %u follows %lld size %llu/%llu" 967 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op), 968 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted), 969 ceph_cap_string(dirty), 970 seq, issue_seq, mseq, follows, size, max_size, 971 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0); 972 973 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false); 974 if (!msg) 975 return -ENOMEM; 976 977 msg->hdr.tid = cpu_to_le64(flush_tid); 978 979 fc = msg->front.iov_base; 980 memset(fc, 0, sizeof(*fc)); 981 982 fc->cap_id = cpu_to_le64(cid); 983 fc->op = cpu_to_le32(op); 984 fc->seq = cpu_to_le32(seq); 985 fc->issue_seq = cpu_to_le32(issue_seq); 986 fc->migrate_seq = cpu_to_le32(mseq); 987 fc->caps = cpu_to_le32(caps); 988 fc->wanted = cpu_to_le32(wanted); 989 fc->dirty = cpu_to_le32(dirty); 990 fc->ino = cpu_to_le64(ino); 991 fc->snap_follows = cpu_to_le64(follows); 992 993 fc->size = cpu_to_le64(size); 994 fc->max_size = cpu_to_le64(max_size); 995 if (mtime) 996 ceph_encode_timespec(&fc->mtime, mtime); 997 if (atime) 998 ceph_encode_timespec(&fc->atime, atime); 999 fc->time_warp_seq = cpu_to_le32(time_warp_seq); 1000 1001 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid)); 1002 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid)); 1003 fc->mode = cpu_to_le32(mode); 1004 1005 fc->xattr_version = cpu_to_le64(xattr_version); 1006 if (xattrs_buf) { 1007 msg->middle = ceph_buffer_get(xattrs_buf); 1008 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len); 1009 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len); 1010 } 1011 1012 ceph_con_send(&session->s_con, msg); 1013 return 0; 1014 } 1015 1016 void __queue_cap_release(struct ceph_mds_session *session, 1017 u64 ino, u64 cap_id, u32 migrate_seq, 1018 u32 issue_seq) 1019 { 1020 struct ceph_msg *msg; 1021 struct ceph_mds_cap_release *head; 1022 struct ceph_mds_cap_item *item; 1023 1024 spin_lock(&session->s_cap_lock); 1025 BUG_ON(!session->s_num_cap_releases); 1026 msg = list_first_entry(&session->s_cap_releases, 1027 struct ceph_msg, list_head); 1028 1029 dout(" adding %llx release to mds%d msg %p (%d left)\n", 1030 ino, session->s_mds, msg, session->s_num_cap_releases); 1031 1032 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE); 1033 head = msg->front.iov_base; 1034 le32_add_cpu(&head->num, 1); 1035 item = msg->front.iov_base + msg->front.iov_len; 1036 item->ino = cpu_to_le64(ino); 1037 item->cap_id = cpu_to_le64(cap_id); 1038 item->migrate_seq = cpu_to_le32(migrate_seq); 1039 item->seq = cpu_to_le32(issue_seq); 1040 1041 session->s_num_cap_releases--; 1042 1043 msg->front.iov_len += sizeof(*item); 1044 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { 1045 dout(" release msg %p full\n", msg); 1046 list_move_tail(&msg->list_head, &session->s_cap_releases_done); 1047 } else { 1048 dout(" release msg %p at %d/%d (%d)\n", msg, 1049 (int)le32_to_cpu(head->num), 1050 (int)CEPH_CAPS_PER_RELEASE, 1051 (int)msg->front.iov_len); 1052 } 1053 spin_unlock(&session->s_cap_lock); 1054 } 1055 1056 /* 1057 * Queue cap releases when an inode is dropped from our cache. Since 1058 * inode is about to be destroyed, there is no need for i_ceph_lock. 1059 */ 1060 void ceph_queue_caps_release(struct inode *inode) 1061 { 1062 struct ceph_inode_info *ci = ceph_inode(inode); 1063 struct rb_node *p; 1064 1065 p = rb_first(&ci->i_caps); 1066 while (p) { 1067 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); 1068 struct ceph_mds_session *session = cap->session; 1069 1070 __queue_cap_release(session, ceph_ino(inode), cap->cap_id, 1071 cap->mseq, cap->issue_seq); 1072 p = rb_next(p); 1073 __ceph_remove_cap(cap); 1074 } 1075 } 1076 1077 /* 1078 * Send a cap msg on the given inode. Update our caps state, then 1079 * drop i_ceph_lock and send the message. 1080 * 1081 * Make note of max_size reported/requested from mds, revoked caps 1082 * that have now been implemented. 1083 * 1084 * Make half-hearted attempt ot to invalidate page cache if we are 1085 * dropping RDCACHE. Note that this will leave behind locked pages 1086 * that we'll then need to deal with elsewhere. 1087 * 1088 * Return non-zero if delayed release, or we experienced an error 1089 * such that the caller should requeue + retry later. 1090 * 1091 * called with i_ceph_lock, then drops it. 1092 * caller should hold snap_rwsem (read), s_mutex. 1093 */ 1094 static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap, 1095 int op, int used, int want, int retain, int flushing, 1096 unsigned *pflush_tid) 1097 __releases(cap->ci->i_ceph_lock) 1098 { 1099 struct ceph_inode_info *ci = cap->ci; 1100 struct inode *inode = &ci->vfs_inode; 1101 u64 cap_id = cap->cap_id; 1102 int held, revoking, dropping, keep; 1103 u64 seq, issue_seq, mseq, time_warp_seq, follows; 1104 u64 size, max_size; 1105 struct timespec mtime, atime; 1106 int wake = 0; 1107 umode_t mode; 1108 kuid_t uid; 1109 kgid_t gid; 1110 struct ceph_mds_session *session; 1111 u64 xattr_version = 0; 1112 struct ceph_buffer *xattr_blob = NULL; 1113 int delayed = 0; 1114 u64 flush_tid = 0; 1115 int i; 1116 int ret; 1117 1118 held = cap->issued | cap->implemented; 1119 revoking = cap->implemented & ~cap->issued; 1120 retain &= ~revoking; 1121 dropping = cap->issued & ~retain; 1122 1123 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n", 1124 inode, cap, cap->session, 1125 ceph_cap_string(held), ceph_cap_string(held & retain), 1126 ceph_cap_string(revoking)); 1127 BUG_ON((retain & CEPH_CAP_PIN) == 0); 1128 1129 session = cap->session; 1130 1131 /* don't release wanted unless we've waited a bit. */ 1132 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && 1133 time_before(jiffies, ci->i_hold_caps_min)) { 1134 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n", 1135 ceph_cap_string(cap->issued), 1136 ceph_cap_string(cap->issued & retain), 1137 ceph_cap_string(cap->mds_wanted), 1138 ceph_cap_string(want)); 1139 want |= cap->mds_wanted; 1140 retain |= cap->issued; 1141 delayed = 1; 1142 } 1143 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH); 1144 1145 cap->issued &= retain; /* drop bits we don't want */ 1146 if (cap->implemented & ~cap->issued) { 1147 /* 1148 * Wake up any waiters on wanted -> needed transition. 1149 * This is due to the weird transition from buffered 1150 * to sync IO... we need to flush dirty pages _before_ 1151 * allowing sync writes to avoid reordering. 1152 */ 1153 wake = 1; 1154 } 1155 cap->implemented &= cap->issued | used; 1156 cap->mds_wanted = want; 1157 1158 if (flushing) { 1159 /* 1160 * assign a tid for flush operations so we can avoid 1161 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark 1162 * clean type races. track latest tid for every bit 1163 * so we can handle flush AxFw, flush Fw, and have the 1164 * first ack clean Ax. 1165 */ 1166 flush_tid = ++ci->i_cap_flush_last_tid; 1167 if (pflush_tid) 1168 *pflush_tid = flush_tid; 1169 dout(" cap_flush_tid %d\n", (int)flush_tid); 1170 for (i = 0; i < CEPH_CAP_BITS; i++) 1171 if (flushing & (1 << i)) 1172 ci->i_cap_flush_tid[i] = flush_tid; 1173 1174 follows = ci->i_head_snapc->seq; 1175 } else { 1176 follows = 0; 1177 } 1178 1179 keep = cap->implemented; 1180 seq = cap->seq; 1181 issue_seq = cap->issue_seq; 1182 mseq = cap->mseq; 1183 size = inode->i_size; 1184 ci->i_reported_size = size; 1185 max_size = ci->i_wanted_max_size; 1186 ci->i_requested_max_size = max_size; 1187 mtime = inode->i_mtime; 1188 atime = inode->i_atime; 1189 time_warp_seq = ci->i_time_warp_seq; 1190 uid = inode->i_uid; 1191 gid = inode->i_gid; 1192 mode = inode->i_mode; 1193 1194 if (flushing & CEPH_CAP_XATTR_EXCL) { 1195 __ceph_build_xattrs_blob(ci); 1196 xattr_blob = ci->i_xattrs.blob; 1197 xattr_version = ci->i_xattrs.version; 1198 } 1199 1200 spin_unlock(&ci->i_ceph_lock); 1201 1202 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id, 1203 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq, 1204 size, max_size, &mtime, &atime, time_warp_seq, 1205 uid, gid, mode, xattr_version, xattr_blob, 1206 follows); 1207 if (ret < 0) { 1208 dout("error sending cap msg, must requeue %p\n", inode); 1209 delayed = 1; 1210 } 1211 1212 if (wake) 1213 wake_up_all(&ci->i_cap_wq); 1214 1215 return delayed; 1216 } 1217 1218 /* 1219 * When a snapshot is taken, clients accumulate dirty metadata on 1220 * inodes with capabilities in ceph_cap_snaps to describe the file 1221 * state at the time the snapshot was taken. This must be flushed 1222 * asynchronously back to the MDS once sync writes complete and dirty 1223 * data is written out. 1224 * 1225 * Unless @again is true, skip cap_snaps that were already sent to 1226 * the MDS (i.e., during this session). 1227 * 1228 * Called under i_ceph_lock. Takes s_mutex as needed. 1229 */ 1230 void __ceph_flush_snaps(struct ceph_inode_info *ci, 1231 struct ceph_mds_session **psession, 1232 int again) 1233 __releases(ci->i_ceph_lock) 1234 __acquires(ci->i_ceph_lock) 1235 { 1236 struct inode *inode = &ci->vfs_inode; 1237 int mds; 1238 struct ceph_cap_snap *capsnap; 1239 u32 mseq; 1240 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 1241 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold 1242 session->s_mutex */ 1243 u64 next_follows = 0; /* keep track of how far we've gotten through the 1244 i_cap_snaps list, and skip these entries next time 1245 around to avoid an infinite loop */ 1246 1247 if (psession) 1248 session = *psession; 1249 1250 dout("__flush_snaps %p\n", inode); 1251 retry: 1252 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 1253 /* avoid an infiniute loop after retry */ 1254 if (capsnap->follows < next_follows) 1255 continue; 1256 /* 1257 * we need to wait for sync writes to complete and for dirty 1258 * pages to be written out. 1259 */ 1260 if (capsnap->dirty_pages || capsnap->writing) 1261 break; 1262 1263 /* 1264 * if cap writeback already occurred, we should have dropped 1265 * the capsnap in ceph_put_wrbuffer_cap_refs. 1266 */ 1267 BUG_ON(capsnap->dirty == 0); 1268 1269 /* pick mds, take s_mutex */ 1270 if (ci->i_auth_cap == NULL) { 1271 dout("no auth cap (migrating?), doing nothing\n"); 1272 goto out; 1273 } 1274 1275 /* only flush each capsnap once */ 1276 if (!again && !list_empty(&capsnap->flushing_item)) { 1277 dout("already flushed %p, skipping\n", capsnap); 1278 continue; 1279 } 1280 1281 mds = ci->i_auth_cap->session->s_mds; 1282 mseq = ci->i_auth_cap->mseq; 1283 1284 if (session && session->s_mds != mds) { 1285 dout("oops, wrong session %p mutex\n", session); 1286 mutex_unlock(&session->s_mutex); 1287 ceph_put_mds_session(session); 1288 session = NULL; 1289 } 1290 if (!session) { 1291 spin_unlock(&ci->i_ceph_lock); 1292 mutex_lock(&mdsc->mutex); 1293 session = __ceph_lookup_mds_session(mdsc, mds); 1294 mutex_unlock(&mdsc->mutex); 1295 if (session) { 1296 dout("inverting session/ino locks on %p\n", 1297 session); 1298 mutex_lock(&session->s_mutex); 1299 } 1300 /* 1301 * if session == NULL, we raced against a cap 1302 * deletion or migration. retry, and we'll 1303 * get a better @mds value next time. 1304 */ 1305 spin_lock(&ci->i_ceph_lock); 1306 goto retry; 1307 } 1308 1309 capsnap->flush_tid = ++ci->i_cap_flush_last_tid; 1310 atomic_inc(&capsnap->nref); 1311 if (!list_empty(&capsnap->flushing_item)) 1312 list_del_init(&capsnap->flushing_item); 1313 list_add_tail(&capsnap->flushing_item, 1314 &session->s_cap_snaps_flushing); 1315 spin_unlock(&ci->i_ceph_lock); 1316 1317 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n", 1318 inode, capsnap, capsnap->follows, capsnap->flush_tid); 1319 send_cap_msg(session, ceph_vino(inode).ino, 0, 1320 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0, 1321 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq, 1322 capsnap->size, 0, 1323 &capsnap->mtime, &capsnap->atime, 1324 capsnap->time_warp_seq, 1325 capsnap->uid, capsnap->gid, capsnap->mode, 1326 capsnap->xattr_version, capsnap->xattr_blob, 1327 capsnap->follows); 1328 1329 next_follows = capsnap->follows + 1; 1330 ceph_put_cap_snap(capsnap); 1331 1332 spin_lock(&ci->i_ceph_lock); 1333 goto retry; 1334 } 1335 1336 /* we flushed them all; remove this inode from the queue */ 1337 spin_lock(&mdsc->snap_flush_lock); 1338 list_del_init(&ci->i_snap_flush_item); 1339 spin_unlock(&mdsc->snap_flush_lock); 1340 1341 out: 1342 if (psession) 1343 *psession = session; 1344 else if (session) { 1345 mutex_unlock(&session->s_mutex); 1346 ceph_put_mds_session(session); 1347 } 1348 } 1349 1350 static void ceph_flush_snaps(struct ceph_inode_info *ci) 1351 { 1352 spin_lock(&ci->i_ceph_lock); 1353 __ceph_flush_snaps(ci, NULL, 0); 1354 spin_unlock(&ci->i_ceph_lock); 1355 } 1356 1357 /* 1358 * Mark caps dirty. If inode is newly dirty, return the dirty flags. 1359 * Caller is then responsible for calling __mark_inode_dirty with the 1360 * returned flags value. 1361 */ 1362 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask) 1363 { 1364 struct ceph_mds_client *mdsc = 1365 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 1366 struct inode *inode = &ci->vfs_inode; 1367 int was = ci->i_dirty_caps; 1368 int dirty = 0; 1369 1370 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode, 1371 ceph_cap_string(mask), ceph_cap_string(was), 1372 ceph_cap_string(was | mask)); 1373 ci->i_dirty_caps |= mask; 1374 if (was == 0) { 1375 if (!ci->i_head_snapc) 1376 ci->i_head_snapc = ceph_get_snap_context( 1377 ci->i_snap_realm->cached_context); 1378 dout(" inode %p now dirty snapc %p auth cap %p\n", 1379 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap); 1380 BUG_ON(!list_empty(&ci->i_dirty_item)); 1381 spin_lock(&mdsc->cap_dirty_lock); 1382 if (ci->i_auth_cap) 1383 list_add(&ci->i_dirty_item, &mdsc->cap_dirty); 1384 else 1385 list_add(&ci->i_dirty_item, 1386 &mdsc->cap_dirty_migrating); 1387 spin_unlock(&mdsc->cap_dirty_lock); 1388 if (ci->i_flushing_caps == 0) { 1389 ihold(inode); 1390 dirty |= I_DIRTY_SYNC; 1391 } 1392 } 1393 BUG_ON(list_empty(&ci->i_dirty_item)); 1394 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && 1395 (mask & CEPH_CAP_FILE_BUFFER)) 1396 dirty |= I_DIRTY_DATASYNC; 1397 __cap_delay_requeue(mdsc, ci); 1398 return dirty; 1399 } 1400 1401 /* 1402 * Add dirty inode to the flushing list. Assigned a seq number so we 1403 * can wait for caps to flush without starving. 1404 * 1405 * Called under i_ceph_lock. 1406 */ 1407 static int __mark_caps_flushing(struct inode *inode, 1408 struct ceph_mds_session *session) 1409 { 1410 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 1411 struct ceph_inode_info *ci = ceph_inode(inode); 1412 int flushing; 1413 1414 BUG_ON(ci->i_dirty_caps == 0); 1415 BUG_ON(list_empty(&ci->i_dirty_item)); 1416 1417 flushing = ci->i_dirty_caps; 1418 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n", 1419 ceph_cap_string(flushing), 1420 ceph_cap_string(ci->i_flushing_caps), 1421 ceph_cap_string(ci->i_flushing_caps | flushing)); 1422 ci->i_flushing_caps |= flushing; 1423 ci->i_dirty_caps = 0; 1424 dout(" inode %p now !dirty\n", inode); 1425 1426 spin_lock(&mdsc->cap_dirty_lock); 1427 list_del_init(&ci->i_dirty_item); 1428 1429 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq; 1430 if (list_empty(&ci->i_flushing_item)) { 1431 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); 1432 mdsc->num_cap_flushing++; 1433 dout(" inode %p now flushing seq %lld\n", inode, 1434 ci->i_cap_flush_seq); 1435 } else { 1436 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); 1437 dout(" inode %p now flushing (more) seq %lld\n", inode, 1438 ci->i_cap_flush_seq); 1439 } 1440 spin_unlock(&mdsc->cap_dirty_lock); 1441 1442 return flushing; 1443 } 1444 1445 /* 1446 * try to invalidate mapping pages without blocking. 1447 */ 1448 static int try_nonblocking_invalidate(struct inode *inode) 1449 { 1450 struct ceph_inode_info *ci = ceph_inode(inode); 1451 u32 invalidating_gen = ci->i_rdcache_gen; 1452 1453 spin_unlock(&ci->i_ceph_lock); 1454 invalidate_mapping_pages(&inode->i_data, 0, -1); 1455 spin_lock(&ci->i_ceph_lock); 1456 1457 if (inode->i_data.nrpages == 0 && 1458 invalidating_gen == ci->i_rdcache_gen) { 1459 /* success. */ 1460 dout("try_nonblocking_invalidate %p success\n", inode); 1461 /* save any racing async invalidate some trouble */ 1462 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; 1463 return 0; 1464 } 1465 dout("try_nonblocking_invalidate %p failed\n", inode); 1466 return -1; 1467 } 1468 1469 /* 1470 * Swiss army knife function to examine currently used and wanted 1471 * versus held caps. Release, flush, ack revoked caps to mds as 1472 * appropriate. 1473 * 1474 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay 1475 * cap release further. 1476 * CHECK_CAPS_AUTHONLY - we should only check the auth cap 1477 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without 1478 * further delay. 1479 */ 1480 void ceph_check_caps(struct ceph_inode_info *ci, int flags, 1481 struct ceph_mds_session *session) 1482 { 1483 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1484 struct ceph_mds_client *mdsc = fsc->mdsc; 1485 struct inode *inode = &ci->vfs_inode; 1486 struct ceph_cap *cap; 1487 int file_wanted, used, cap_used; 1488 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */ 1489 int issued, implemented, want, retain, revoking, flushing = 0; 1490 int mds = -1; /* keep track of how far we've gone through i_caps list 1491 to avoid an infinite loop on retry */ 1492 struct rb_node *p; 1493 int tried_invalidate = 0; 1494 int delayed = 0, sent = 0, force_requeue = 0, num; 1495 int queue_invalidate = 0; 1496 int is_delayed = flags & CHECK_CAPS_NODELAY; 1497 1498 /* if we are unmounting, flush any unused caps immediately. */ 1499 if (mdsc->stopping) 1500 is_delayed = 1; 1501 1502 spin_lock(&ci->i_ceph_lock); 1503 1504 if (ci->i_ceph_flags & CEPH_I_FLUSH) 1505 flags |= CHECK_CAPS_FLUSH; 1506 1507 /* flush snaps first time around only */ 1508 if (!list_empty(&ci->i_cap_snaps)) 1509 __ceph_flush_snaps(ci, &session, 0); 1510 goto retry_locked; 1511 retry: 1512 spin_lock(&ci->i_ceph_lock); 1513 retry_locked: 1514 file_wanted = __ceph_caps_file_wanted(ci); 1515 used = __ceph_caps_used(ci); 1516 want = file_wanted | used; 1517 issued = __ceph_caps_issued(ci, &implemented); 1518 revoking = implemented & ~issued; 1519 1520 retain = want | CEPH_CAP_PIN; 1521 if (!mdsc->stopping && inode->i_nlink > 0) { 1522 if (want) { 1523 retain |= CEPH_CAP_ANY; /* be greedy */ 1524 } else { 1525 retain |= CEPH_CAP_ANY_SHARED; 1526 /* 1527 * keep RD only if we didn't have the file open RW, 1528 * because then the mds would revoke it anyway to 1529 * journal max_size=0. 1530 */ 1531 if (ci->i_max_size == 0) 1532 retain |= CEPH_CAP_ANY_RD; 1533 } 1534 } 1535 1536 dout("check_caps %p file_want %s used %s dirty %s flushing %s" 1537 " issued %s revoking %s retain %s %s%s%s\n", inode, 1538 ceph_cap_string(file_wanted), 1539 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), 1540 ceph_cap_string(ci->i_flushing_caps), 1541 ceph_cap_string(issued), ceph_cap_string(revoking), 1542 ceph_cap_string(retain), 1543 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", 1544 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "", 1545 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : ""); 1546 1547 /* 1548 * If we no longer need to hold onto old our caps, and we may 1549 * have cached pages, but don't want them, then try to invalidate. 1550 * If we fail, it's because pages are locked.... try again later. 1551 */ 1552 if ((!is_delayed || mdsc->stopping) && 1553 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */ 1554 inode->i_data.nrpages && /* have cached pages */ 1555 (file_wanted == 0 || /* no open files */ 1556 (revoking & (CEPH_CAP_FILE_CACHE| 1557 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */ 1558 !tried_invalidate) { 1559 dout("check_caps trying to invalidate on %p\n", inode); 1560 if (try_nonblocking_invalidate(inode) < 0) { 1561 if (revoking & (CEPH_CAP_FILE_CACHE| 1562 CEPH_CAP_FILE_LAZYIO)) { 1563 dout("check_caps queuing invalidate\n"); 1564 queue_invalidate = 1; 1565 ci->i_rdcache_revoking = ci->i_rdcache_gen; 1566 } else { 1567 dout("check_caps failed to invalidate pages\n"); 1568 /* we failed to invalidate pages. check these 1569 caps again later. */ 1570 force_requeue = 1; 1571 __cap_set_timeouts(mdsc, ci); 1572 } 1573 } 1574 tried_invalidate = 1; 1575 goto retry_locked; 1576 } 1577 1578 num = 0; 1579 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 1580 cap = rb_entry(p, struct ceph_cap, ci_node); 1581 num++; 1582 1583 /* avoid looping forever */ 1584 if (mds >= cap->mds || 1585 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) 1586 continue; 1587 1588 /* NOTE: no side-effects allowed, until we take s_mutex */ 1589 1590 cap_used = used; 1591 if (ci->i_auth_cap && cap != ci->i_auth_cap) 1592 cap_used &= ~ci->i_auth_cap->issued; 1593 1594 revoking = cap->implemented & ~cap->issued; 1595 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n", 1596 cap->mds, cap, ceph_cap_string(cap->issued), 1597 ceph_cap_string(cap_used), 1598 ceph_cap_string(cap->implemented), 1599 ceph_cap_string(revoking)); 1600 1601 if (cap == ci->i_auth_cap && 1602 (cap->issued & CEPH_CAP_FILE_WR)) { 1603 /* request larger max_size from MDS? */ 1604 if (ci->i_wanted_max_size > ci->i_max_size && 1605 ci->i_wanted_max_size > ci->i_requested_max_size) { 1606 dout("requesting new max_size\n"); 1607 goto ack; 1608 } 1609 1610 /* approaching file_max? */ 1611 if ((inode->i_size << 1) >= ci->i_max_size && 1612 (ci->i_reported_size << 1) < ci->i_max_size) { 1613 dout("i_size approaching max_size\n"); 1614 goto ack; 1615 } 1616 } 1617 /* flush anything dirty? */ 1618 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) && 1619 ci->i_dirty_caps) { 1620 dout("flushing dirty caps\n"); 1621 goto ack; 1622 } 1623 1624 /* completed revocation? going down and there are no caps? */ 1625 if (revoking && (revoking & cap_used) == 0) { 1626 dout("completed revocation of %s\n", 1627 ceph_cap_string(cap->implemented & ~cap->issued)); 1628 goto ack; 1629 } 1630 1631 /* want more caps from mds? */ 1632 if (want & ~(cap->mds_wanted | cap->issued)) 1633 goto ack; 1634 1635 /* things we might delay */ 1636 if ((cap->issued & ~retain) == 0 && 1637 cap->mds_wanted == want) 1638 continue; /* nope, all good */ 1639 1640 if (is_delayed) 1641 goto ack; 1642 1643 /* delay? */ 1644 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && 1645 time_before(jiffies, ci->i_hold_caps_max)) { 1646 dout(" delaying issued %s -> %s, wanted %s -> %s\n", 1647 ceph_cap_string(cap->issued), 1648 ceph_cap_string(cap->issued & retain), 1649 ceph_cap_string(cap->mds_wanted), 1650 ceph_cap_string(want)); 1651 delayed++; 1652 continue; 1653 } 1654 1655 ack: 1656 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { 1657 dout(" skipping %p I_NOFLUSH set\n", inode); 1658 continue; 1659 } 1660 1661 if (session && session != cap->session) { 1662 dout("oops, wrong session %p mutex\n", session); 1663 mutex_unlock(&session->s_mutex); 1664 session = NULL; 1665 } 1666 if (!session) { 1667 session = cap->session; 1668 if (mutex_trylock(&session->s_mutex) == 0) { 1669 dout("inverting session/ino locks on %p\n", 1670 session); 1671 spin_unlock(&ci->i_ceph_lock); 1672 if (took_snap_rwsem) { 1673 up_read(&mdsc->snap_rwsem); 1674 took_snap_rwsem = 0; 1675 } 1676 mutex_lock(&session->s_mutex); 1677 goto retry; 1678 } 1679 } 1680 /* take snap_rwsem after session mutex */ 1681 if (!took_snap_rwsem) { 1682 if (down_read_trylock(&mdsc->snap_rwsem) == 0) { 1683 dout("inverting snap/in locks on %p\n", 1684 inode); 1685 spin_unlock(&ci->i_ceph_lock); 1686 down_read(&mdsc->snap_rwsem); 1687 took_snap_rwsem = 1; 1688 goto retry; 1689 } 1690 took_snap_rwsem = 1; 1691 } 1692 1693 if (cap == ci->i_auth_cap && ci->i_dirty_caps) 1694 flushing = __mark_caps_flushing(inode, session); 1695 else 1696 flushing = 0; 1697 1698 mds = cap->mds; /* remember mds, so we don't repeat */ 1699 sent++; 1700 1701 /* __send_cap drops i_ceph_lock */ 1702 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used, 1703 want, retain, flushing, NULL); 1704 goto retry; /* retake i_ceph_lock and restart our cap scan. */ 1705 } 1706 1707 /* 1708 * Reschedule delayed caps release if we delayed anything, 1709 * otherwise cancel. 1710 */ 1711 if (delayed && is_delayed) 1712 force_requeue = 1; /* __send_cap delayed release; requeue */ 1713 if (!delayed && !is_delayed) 1714 __cap_delay_cancel(mdsc, ci); 1715 else if (!is_delayed || force_requeue) 1716 __cap_delay_requeue(mdsc, ci); 1717 1718 spin_unlock(&ci->i_ceph_lock); 1719 1720 if (queue_invalidate) 1721 ceph_queue_invalidate(inode); 1722 1723 if (session) 1724 mutex_unlock(&session->s_mutex); 1725 if (took_snap_rwsem) 1726 up_read(&mdsc->snap_rwsem); 1727 } 1728 1729 /* 1730 * Try to flush dirty caps back to the auth mds. 1731 */ 1732 static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session, 1733 unsigned *flush_tid) 1734 { 1735 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 1736 struct ceph_inode_info *ci = ceph_inode(inode); 1737 int unlock_session = session ? 0 : 1; 1738 int flushing = 0; 1739 1740 retry: 1741 spin_lock(&ci->i_ceph_lock); 1742 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { 1743 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode); 1744 goto out; 1745 } 1746 if (ci->i_dirty_caps && ci->i_auth_cap) { 1747 struct ceph_cap *cap = ci->i_auth_cap; 1748 int used = __ceph_caps_used(ci); 1749 int want = __ceph_caps_wanted(ci); 1750 int delayed; 1751 1752 if (!session) { 1753 spin_unlock(&ci->i_ceph_lock); 1754 session = cap->session; 1755 mutex_lock(&session->s_mutex); 1756 goto retry; 1757 } 1758 BUG_ON(session != cap->session); 1759 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) 1760 goto out; 1761 1762 flushing = __mark_caps_flushing(inode, session); 1763 1764 /* __send_cap drops i_ceph_lock */ 1765 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want, 1766 cap->issued | cap->implemented, flushing, 1767 flush_tid); 1768 if (!delayed) 1769 goto out_unlocked; 1770 1771 spin_lock(&ci->i_ceph_lock); 1772 __cap_delay_requeue(mdsc, ci); 1773 } 1774 out: 1775 spin_unlock(&ci->i_ceph_lock); 1776 out_unlocked: 1777 if (session && unlock_session) 1778 mutex_unlock(&session->s_mutex); 1779 return flushing; 1780 } 1781 1782 /* 1783 * Return true if we've flushed caps through the given flush_tid. 1784 */ 1785 static int caps_are_flushed(struct inode *inode, unsigned tid) 1786 { 1787 struct ceph_inode_info *ci = ceph_inode(inode); 1788 int i, ret = 1; 1789 1790 spin_lock(&ci->i_ceph_lock); 1791 for (i = 0; i < CEPH_CAP_BITS; i++) 1792 if ((ci->i_flushing_caps & (1 << i)) && 1793 ci->i_cap_flush_tid[i] <= tid) { 1794 /* still flushing this bit */ 1795 ret = 0; 1796 break; 1797 } 1798 spin_unlock(&ci->i_ceph_lock); 1799 return ret; 1800 } 1801 1802 /* 1803 * Wait on any unsafe replies for the given inode. First wait on the 1804 * newest request, and make that the upper bound. Then, if there are 1805 * more requests, keep waiting on the oldest as long as it is still older 1806 * than the original request. 1807 */ 1808 static void sync_write_wait(struct inode *inode) 1809 { 1810 struct ceph_inode_info *ci = ceph_inode(inode); 1811 struct list_head *head = &ci->i_unsafe_writes; 1812 struct ceph_osd_request *req; 1813 u64 last_tid; 1814 1815 spin_lock(&ci->i_unsafe_lock); 1816 if (list_empty(head)) 1817 goto out; 1818 1819 /* set upper bound as _last_ entry in chain */ 1820 req = list_entry(head->prev, struct ceph_osd_request, 1821 r_unsafe_item); 1822 last_tid = req->r_tid; 1823 1824 do { 1825 ceph_osdc_get_request(req); 1826 spin_unlock(&ci->i_unsafe_lock); 1827 dout("sync_write_wait on tid %llu (until %llu)\n", 1828 req->r_tid, last_tid); 1829 wait_for_completion(&req->r_safe_completion); 1830 spin_lock(&ci->i_unsafe_lock); 1831 ceph_osdc_put_request(req); 1832 1833 /* 1834 * from here on look at first entry in chain, since we 1835 * only want to wait for anything older than last_tid 1836 */ 1837 if (list_empty(head)) 1838 break; 1839 req = list_entry(head->next, struct ceph_osd_request, 1840 r_unsafe_item); 1841 } while (req->r_tid < last_tid); 1842 out: 1843 spin_unlock(&ci->i_unsafe_lock); 1844 } 1845 1846 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) 1847 { 1848 struct inode *inode = file->f_mapping->host; 1849 struct ceph_inode_info *ci = ceph_inode(inode); 1850 unsigned flush_tid; 1851 int ret; 1852 int dirty; 1853 1854 dout("fsync %p%s\n", inode, datasync ? " datasync" : ""); 1855 sync_write_wait(inode); 1856 1857 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 1858 if (ret < 0) 1859 return ret; 1860 mutex_lock(&inode->i_mutex); 1861 1862 dirty = try_flush_caps(inode, NULL, &flush_tid); 1863 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); 1864 1865 /* 1866 * only wait on non-file metadata writeback (the mds 1867 * can recover size and mtime, so we don't need to 1868 * wait for that) 1869 */ 1870 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { 1871 dout("fsync waiting for flush_tid %u\n", flush_tid); 1872 ret = wait_event_interruptible(ci->i_cap_wq, 1873 caps_are_flushed(inode, flush_tid)); 1874 } 1875 1876 dout("fsync %p%s done\n", inode, datasync ? " datasync" : ""); 1877 mutex_unlock(&inode->i_mutex); 1878 return ret; 1879 } 1880 1881 /* 1882 * Flush any dirty caps back to the mds. If we aren't asked to wait, 1883 * queue inode for flush but don't do so immediately, because we can 1884 * get by with fewer MDS messages if we wait for data writeback to 1885 * complete first. 1886 */ 1887 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) 1888 { 1889 struct ceph_inode_info *ci = ceph_inode(inode); 1890 unsigned flush_tid; 1891 int err = 0; 1892 int dirty; 1893 int wait = wbc->sync_mode == WB_SYNC_ALL; 1894 1895 dout("write_inode %p wait=%d\n", inode, wait); 1896 if (wait) { 1897 dirty = try_flush_caps(inode, NULL, &flush_tid); 1898 if (dirty) 1899 err = wait_event_interruptible(ci->i_cap_wq, 1900 caps_are_flushed(inode, flush_tid)); 1901 } else { 1902 struct ceph_mds_client *mdsc = 1903 ceph_sb_to_client(inode->i_sb)->mdsc; 1904 1905 spin_lock(&ci->i_ceph_lock); 1906 if (__ceph_caps_dirty(ci)) 1907 __cap_delay_requeue_front(mdsc, ci); 1908 spin_unlock(&ci->i_ceph_lock); 1909 } 1910 return err; 1911 } 1912 1913 /* 1914 * After a recovering MDS goes active, we need to resend any caps 1915 * we were flushing. 1916 * 1917 * Caller holds session->s_mutex. 1918 */ 1919 static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc, 1920 struct ceph_mds_session *session) 1921 { 1922 struct ceph_cap_snap *capsnap; 1923 1924 dout("kick_flushing_capsnaps mds%d\n", session->s_mds); 1925 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing, 1926 flushing_item) { 1927 struct ceph_inode_info *ci = capsnap->ci; 1928 struct inode *inode = &ci->vfs_inode; 1929 struct ceph_cap *cap; 1930 1931 spin_lock(&ci->i_ceph_lock); 1932 cap = ci->i_auth_cap; 1933 if (cap && cap->session == session) { 1934 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode, 1935 cap, capsnap); 1936 __ceph_flush_snaps(ci, &session, 1); 1937 } else { 1938 pr_err("%p auth cap %p not mds%d ???\n", inode, 1939 cap, session->s_mds); 1940 } 1941 spin_unlock(&ci->i_ceph_lock); 1942 } 1943 } 1944 1945 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 1946 struct ceph_mds_session *session) 1947 { 1948 struct ceph_inode_info *ci; 1949 1950 kick_flushing_capsnaps(mdsc, session); 1951 1952 dout("kick_flushing_caps mds%d\n", session->s_mds); 1953 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { 1954 struct inode *inode = &ci->vfs_inode; 1955 struct ceph_cap *cap; 1956 int delayed = 0; 1957 1958 spin_lock(&ci->i_ceph_lock); 1959 cap = ci->i_auth_cap; 1960 if (cap && cap->session == session) { 1961 dout("kick_flushing_caps %p cap %p %s\n", inode, 1962 cap, ceph_cap_string(ci->i_flushing_caps)); 1963 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, 1964 __ceph_caps_used(ci), 1965 __ceph_caps_wanted(ci), 1966 cap->issued | cap->implemented, 1967 ci->i_flushing_caps, NULL); 1968 if (delayed) { 1969 spin_lock(&ci->i_ceph_lock); 1970 __cap_delay_requeue(mdsc, ci); 1971 spin_unlock(&ci->i_ceph_lock); 1972 } 1973 } else { 1974 pr_err("%p auth cap %p not mds%d ???\n", inode, 1975 cap, session->s_mds); 1976 spin_unlock(&ci->i_ceph_lock); 1977 } 1978 } 1979 } 1980 1981 static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc, 1982 struct ceph_mds_session *session, 1983 struct inode *inode) 1984 { 1985 struct ceph_inode_info *ci = ceph_inode(inode); 1986 struct ceph_cap *cap; 1987 int delayed = 0; 1988 1989 spin_lock(&ci->i_ceph_lock); 1990 cap = ci->i_auth_cap; 1991 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode, 1992 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq); 1993 1994 __ceph_flush_snaps(ci, &session, 1); 1995 1996 if (ci->i_flushing_caps) { 1997 spin_lock(&mdsc->cap_dirty_lock); 1998 list_move_tail(&ci->i_flushing_item, 1999 &cap->session->s_cap_flushing); 2000 spin_unlock(&mdsc->cap_dirty_lock); 2001 2002 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, 2003 __ceph_caps_used(ci), 2004 __ceph_caps_wanted(ci), 2005 cap->issued | cap->implemented, 2006 ci->i_flushing_caps, NULL); 2007 if (delayed) { 2008 spin_lock(&ci->i_ceph_lock); 2009 __cap_delay_requeue(mdsc, ci); 2010 spin_unlock(&ci->i_ceph_lock); 2011 } 2012 } else { 2013 spin_unlock(&ci->i_ceph_lock); 2014 } 2015 } 2016 2017 2018 /* 2019 * Take references to capabilities we hold, so that we don't release 2020 * them to the MDS prematurely. 2021 * 2022 * Protected by i_ceph_lock. 2023 */ 2024 static void __take_cap_refs(struct ceph_inode_info *ci, int got) 2025 { 2026 if (got & CEPH_CAP_PIN) 2027 ci->i_pin_ref++; 2028 if (got & CEPH_CAP_FILE_RD) 2029 ci->i_rd_ref++; 2030 if (got & CEPH_CAP_FILE_CACHE) 2031 ci->i_rdcache_ref++; 2032 if (got & CEPH_CAP_FILE_WR) 2033 ci->i_wr_ref++; 2034 if (got & CEPH_CAP_FILE_BUFFER) { 2035 if (ci->i_wb_ref == 0) 2036 ihold(&ci->vfs_inode); 2037 ci->i_wb_ref++; 2038 dout("__take_cap_refs %p wb %d -> %d (?)\n", 2039 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref); 2040 } 2041 } 2042 2043 /* 2044 * Try to grab cap references. Specify those refs we @want, and the 2045 * minimal set we @need. Also include the larger offset we are writing 2046 * to (when applicable), and check against max_size here as well. 2047 * Note that caller is responsible for ensuring max_size increases are 2048 * requested from the MDS. 2049 */ 2050 static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want, 2051 int *got, loff_t endoff, int *check_max, int *err) 2052 { 2053 struct inode *inode = &ci->vfs_inode; 2054 int ret = 0; 2055 int have, implemented; 2056 int file_wanted; 2057 2058 dout("get_cap_refs %p need %s want %s\n", inode, 2059 ceph_cap_string(need), ceph_cap_string(want)); 2060 spin_lock(&ci->i_ceph_lock); 2061 2062 /* make sure file is actually open */ 2063 file_wanted = __ceph_caps_file_wanted(ci); 2064 if ((file_wanted & need) == 0) { 2065 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n", 2066 ceph_cap_string(need), ceph_cap_string(file_wanted)); 2067 *err = -EBADF; 2068 ret = 1; 2069 goto out; 2070 } 2071 2072 /* finish pending truncate */ 2073 while (ci->i_truncate_pending) { 2074 spin_unlock(&ci->i_ceph_lock); 2075 if (!(need & CEPH_CAP_FILE_WR)) 2076 mutex_lock(&inode->i_mutex); 2077 __ceph_do_pending_vmtruncate(inode); 2078 if (!(need & CEPH_CAP_FILE_WR)) 2079 mutex_unlock(&inode->i_mutex); 2080 spin_lock(&ci->i_ceph_lock); 2081 } 2082 2083 if (need & CEPH_CAP_FILE_WR) { 2084 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { 2085 dout("get_cap_refs %p endoff %llu > maxsize %llu\n", 2086 inode, endoff, ci->i_max_size); 2087 if (endoff > ci->i_wanted_max_size) { 2088 *check_max = 1; 2089 ret = 1; 2090 } 2091 goto out; 2092 } 2093 /* 2094 * If a sync write is in progress, we must wait, so that we 2095 * can get a final snapshot value for size+mtime. 2096 */ 2097 if (__ceph_have_pending_cap_snap(ci)) { 2098 dout("get_cap_refs %p cap_snap_pending\n", inode); 2099 goto out; 2100 } 2101 } 2102 have = __ceph_caps_issued(ci, &implemented); 2103 2104 if ((have & need) == need) { 2105 /* 2106 * Look at (implemented & ~have & not) so that we keep waiting 2107 * on transition from wanted -> needed caps. This is needed 2108 * for WRBUFFER|WR -> WR to avoid a new WR sync write from 2109 * going before a prior buffered writeback happens. 2110 */ 2111 int not = want & ~(have & need); 2112 int revoking = implemented & ~have; 2113 dout("get_cap_refs %p have %s but not %s (revoking %s)\n", 2114 inode, ceph_cap_string(have), ceph_cap_string(not), 2115 ceph_cap_string(revoking)); 2116 if ((revoking & not) == 0) { 2117 *got = need | (have & want); 2118 __take_cap_refs(ci, *got); 2119 ret = 1; 2120 } 2121 } else { 2122 dout("get_cap_refs %p have %s needed %s\n", inode, 2123 ceph_cap_string(have), ceph_cap_string(need)); 2124 } 2125 out: 2126 spin_unlock(&ci->i_ceph_lock); 2127 dout("get_cap_refs %p ret %d got %s\n", inode, 2128 ret, ceph_cap_string(*got)); 2129 return ret; 2130 } 2131 2132 /* 2133 * Check the offset we are writing up to against our current 2134 * max_size. If necessary, tell the MDS we want to write to 2135 * a larger offset. 2136 */ 2137 static void check_max_size(struct inode *inode, loff_t endoff) 2138 { 2139 struct ceph_inode_info *ci = ceph_inode(inode); 2140 int check = 0; 2141 2142 /* do we need to explicitly request a larger max_size? */ 2143 spin_lock(&ci->i_ceph_lock); 2144 if ((endoff >= ci->i_max_size || 2145 endoff > (inode->i_size << 1)) && 2146 endoff > ci->i_wanted_max_size) { 2147 dout("write %p at large endoff %llu, req max_size\n", 2148 inode, endoff); 2149 ci->i_wanted_max_size = endoff; 2150 check = 1; 2151 } 2152 spin_unlock(&ci->i_ceph_lock); 2153 if (check) 2154 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 2155 } 2156 2157 /* 2158 * Wait for caps, and take cap references. If we can't get a WR cap 2159 * due to a small max_size, make sure we check_max_size (and possibly 2160 * ask the mds) so we don't get hung up indefinitely. 2161 */ 2162 int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got, 2163 loff_t endoff) 2164 { 2165 int check_max, ret, err; 2166 2167 retry: 2168 if (endoff > 0) 2169 check_max_size(&ci->vfs_inode, endoff); 2170 check_max = 0; 2171 err = 0; 2172 ret = wait_event_interruptible(ci->i_cap_wq, 2173 try_get_cap_refs(ci, need, want, 2174 got, endoff, 2175 &check_max, &err)); 2176 if (err) 2177 ret = err; 2178 if (check_max) 2179 goto retry; 2180 return ret; 2181 } 2182 2183 /* 2184 * Take cap refs. Caller must already know we hold at least one ref 2185 * on the caps in question or we don't know this is safe. 2186 */ 2187 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) 2188 { 2189 spin_lock(&ci->i_ceph_lock); 2190 __take_cap_refs(ci, caps); 2191 spin_unlock(&ci->i_ceph_lock); 2192 } 2193 2194 /* 2195 * Release cap refs. 2196 * 2197 * If we released the last ref on any given cap, call ceph_check_caps 2198 * to release (or schedule a release). 2199 * 2200 * If we are releasing a WR cap (from a sync write), finalize any affected 2201 * cap_snap, and wake up any waiters. 2202 */ 2203 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) 2204 { 2205 struct inode *inode = &ci->vfs_inode; 2206 int last = 0, put = 0, flushsnaps = 0, wake = 0; 2207 struct ceph_cap_snap *capsnap; 2208 2209 spin_lock(&ci->i_ceph_lock); 2210 if (had & CEPH_CAP_PIN) 2211 --ci->i_pin_ref; 2212 if (had & CEPH_CAP_FILE_RD) 2213 if (--ci->i_rd_ref == 0) 2214 last++; 2215 if (had & CEPH_CAP_FILE_CACHE) 2216 if (--ci->i_rdcache_ref == 0) 2217 last++; 2218 if (had & CEPH_CAP_FILE_BUFFER) { 2219 if (--ci->i_wb_ref == 0) { 2220 last++; 2221 put++; 2222 } 2223 dout("put_cap_refs %p wb %d -> %d (?)\n", 2224 inode, ci->i_wb_ref+1, ci->i_wb_ref); 2225 } 2226 if (had & CEPH_CAP_FILE_WR) 2227 if (--ci->i_wr_ref == 0) { 2228 last++; 2229 if (!list_empty(&ci->i_cap_snaps)) { 2230 capsnap = list_first_entry(&ci->i_cap_snaps, 2231 struct ceph_cap_snap, 2232 ci_item); 2233 if (capsnap->writing) { 2234 capsnap->writing = 0; 2235 flushsnaps = 2236 __ceph_finish_cap_snap(ci, 2237 capsnap); 2238 wake = 1; 2239 } 2240 } 2241 } 2242 spin_unlock(&ci->i_ceph_lock); 2243 2244 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had), 2245 last ? " last" : "", put ? " put" : ""); 2246 2247 if (last && !flushsnaps) 2248 ceph_check_caps(ci, 0, NULL); 2249 else if (flushsnaps) 2250 ceph_flush_snaps(ci); 2251 if (wake) 2252 wake_up_all(&ci->i_cap_wq); 2253 if (put) 2254 iput(inode); 2255 } 2256 2257 /* 2258 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap 2259 * context. Adjust per-snap dirty page accounting as appropriate. 2260 * Once all dirty data for a cap_snap is flushed, flush snapped file 2261 * metadata back to the MDS. If we dropped the last ref, call 2262 * ceph_check_caps. 2263 */ 2264 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 2265 struct ceph_snap_context *snapc) 2266 { 2267 struct inode *inode = &ci->vfs_inode; 2268 int last = 0; 2269 int complete_capsnap = 0; 2270 int drop_capsnap = 0; 2271 int found = 0; 2272 struct ceph_cap_snap *capsnap = NULL; 2273 2274 spin_lock(&ci->i_ceph_lock); 2275 ci->i_wrbuffer_ref -= nr; 2276 last = !ci->i_wrbuffer_ref; 2277 2278 if (ci->i_head_snapc == snapc) { 2279 ci->i_wrbuffer_ref_head -= nr; 2280 if (ci->i_wrbuffer_ref_head == 0 && 2281 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) { 2282 BUG_ON(!ci->i_head_snapc); 2283 ceph_put_snap_context(ci->i_head_snapc); 2284 ci->i_head_snapc = NULL; 2285 } 2286 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n", 2287 inode, 2288 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr, 2289 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 2290 last ? " LAST" : ""); 2291 } else { 2292 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 2293 if (capsnap->context == snapc) { 2294 found = 1; 2295 break; 2296 } 2297 } 2298 BUG_ON(!found); 2299 capsnap->dirty_pages -= nr; 2300 if (capsnap->dirty_pages == 0) { 2301 complete_capsnap = 1; 2302 if (capsnap->dirty == 0) 2303 /* cap writeback completed before we created 2304 * the cap_snap; no FLUSHSNAP is needed */ 2305 drop_capsnap = 1; 2306 } 2307 dout("put_wrbuffer_cap_refs on %p cap_snap %p " 2308 " snap %lld %d/%d -> %d/%d %s%s%s\n", 2309 inode, capsnap, capsnap->context->seq, 2310 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, 2311 ci->i_wrbuffer_ref, capsnap->dirty_pages, 2312 last ? " (wrbuffer last)" : "", 2313 complete_capsnap ? " (complete capsnap)" : "", 2314 drop_capsnap ? " (drop capsnap)" : ""); 2315 if (drop_capsnap) { 2316 ceph_put_snap_context(capsnap->context); 2317 list_del(&capsnap->ci_item); 2318 list_del(&capsnap->flushing_item); 2319 ceph_put_cap_snap(capsnap); 2320 } 2321 } 2322 2323 spin_unlock(&ci->i_ceph_lock); 2324 2325 if (last) { 2326 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 2327 iput(inode); 2328 } else if (complete_capsnap) { 2329 ceph_flush_snaps(ci); 2330 wake_up_all(&ci->i_cap_wq); 2331 } 2332 if (drop_capsnap) 2333 iput(inode); 2334 } 2335 2336 /* 2337 * Handle a cap GRANT message from the MDS. (Note that a GRANT may 2338 * actually be a revocation if it specifies a smaller cap set.) 2339 * 2340 * caller holds s_mutex and i_ceph_lock, we drop both. 2341 * 2342 * return value: 2343 * 0 - ok 2344 * 1 - check_caps on auth cap only (writeback) 2345 * 2 - check_caps (ack revoke) 2346 */ 2347 static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, 2348 struct ceph_mds_session *session, 2349 struct ceph_cap *cap, 2350 struct ceph_buffer *xattr_buf) 2351 __releases(ci->i_ceph_lock) 2352 { 2353 struct ceph_inode_info *ci = ceph_inode(inode); 2354 int mds = session->s_mds; 2355 int seq = le32_to_cpu(grant->seq); 2356 int newcaps = le32_to_cpu(grant->caps); 2357 int issued, implemented, used, wanted, dirty; 2358 u64 size = le64_to_cpu(grant->size); 2359 u64 max_size = le64_to_cpu(grant->max_size); 2360 struct timespec mtime, atime, ctime; 2361 int check_caps = 0; 2362 int wake = 0; 2363 int writeback = 0; 2364 int revoked_rdcache = 0; 2365 int queue_invalidate = 0; 2366 2367 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", 2368 inode, cap, mds, seq, ceph_cap_string(newcaps)); 2369 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size, 2370 inode->i_size); 2371 2372 /* 2373 * If CACHE is being revoked, and we have no dirty buffers, 2374 * try to invalidate (once). (If there are dirty buffers, we 2375 * will invalidate _after_ writeback.) 2376 */ 2377 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && 2378 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && 2379 !ci->i_wrbuffer_ref) { 2380 if (try_nonblocking_invalidate(inode) == 0) { 2381 revoked_rdcache = 1; 2382 } else { 2383 /* there were locked pages.. invalidate later 2384 in a separate thread. */ 2385 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 2386 queue_invalidate = 1; 2387 ci->i_rdcache_revoking = ci->i_rdcache_gen; 2388 } 2389 } 2390 } 2391 2392 /* side effects now are allowed */ 2393 2394 issued = __ceph_caps_issued(ci, &implemented); 2395 issued |= implemented | __ceph_caps_dirty(ci); 2396 2397 cap->cap_gen = session->s_cap_gen; 2398 2399 __check_cap_issue(ci, cap, newcaps); 2400 2401 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { 2402 inode->i_mode = le32_to_cpu(grant->mode); 2403 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid)); 2404 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid)); 2405 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 2406 from_kuid(&init_user_ns, inode->i_uid), 2407 from_kgid(&init_user_ns, inode->i_gid)); 2408 } 2409 2410 if ((issued & CEPH_CAP_LINK_EXCL) == 0) 2411 set_nlink(inode, le32_to_cpu(grant->nlink)); 2412 2413 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) { 2414 int len = le32_to_cpu(grant->xattr_len); 2415 u64 version = le64_to_cpu(grant->xattr_version); 2416 2417 if (version > ci->i_xattrs.version) { 2418 dout(" got new xattrs v%llu on %p len %d\n", 2419 version, inode, len); 2420 if (ci->i_xattrs.blob) 2421 ceph_buffer_put(ci->i_xattrs.blob); 2422 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); 2423 ci->i_xattrs.version = version; 2424 } 2425 } 2426 2427 /* size/ctime/mtime/atime? */ 2428 ceph_fill_file_size(inode, issued, 2429 le32_to_cpu(grant->truncate_seq), 2430 le64_to_cpu(grant->truncate_size), size); 2431 ceph_decode_timespec(&mtime, &grant->mtime); 2432 ceph_decode_timespec(&atime, &grant->atime); 2433 ceph_decode_timespec(&ctime, &grant->ctime); 2434 ceph_fill_file_time(inode, issued, 2435 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime, 2436 &atime); 2437 2438 /* max size increase? */ 2439 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) { 2440 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size); 2441 ci->i_max_size = max_size; 2442 if (max_size >= ci->i_wanted_max_size) { 2443 ci->i_wanted_max_size = 0; /* reset */ 2444 ci->i_requested_max_size = 0; 2445 } 2446 wake = 1; 2447 } 2448 2449 /* check cap bits */ 2450 wanted = __ceph_caps_wanted(ci); 2451 used = __ceph_caps_used(ci); 2452 dirty = __ceph_caps_dirty(ci); 2453 dout(" my wanted = %s, used = %s, dirty %s\n", 2454 ceph_cap_string(wanted), 2455 ceph_cap_string(used), 2456 ceph_cap_string(dirty)); 2457 if (wanted != le32_to_cpu(grant->wanted)) { 2458 dout("mds wanted %s -> %s\n", 2459 ceph_cap_string(le32_to_cpu(grant->wanted)), 2460 ceph_cap_string(wanted)); 2461 /* imported cap may not have correct mds_wanted */ 2462 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) 2463 check_caps = 1; 2464 } 2465 2466 cap->seq = seq; 2467 2468 /* file layout may have changed */ 2469 ci->i_layout = grant->layout; 2470 2471 /* revocation, grant, or no-op? */ 2472 if (cap->issued & ~newcaps) { 2473 int revoking = cap->issued & ~newcaps; 2474 2475 dout("revocation: %s -> %s (revoking %s)\n", 2476 ceph_cap_string(cap->issued), 2477 ceph_cap_string(newcaps), 2478 ceph_cap_string(revoking)); 2479 if (revoking & used & CEPH_CAP_FILE_BUFFER) 2480 writeback = 1; /* initiate writeback; will delay ack */ 2481 else if (revoking == CEPH_CAP_FILE_CACHE && 2482 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && 2483 queue_invalidate) 2484 ; /* do nothing yet, invalidation will be queued */ 2485 else if (cap == ci->i_auth_cap) 2486 check_caps = 1; /* check auth cap only */ 2487 else 2488 check_caps = 2; /* check all caps */ 2489 cap->issued = newcaps; 2490 cap->implemented |= newcaps; 2491 } else if (cap->issued == newcaps) { 2492 dout("caps unchanged: %s -> %s\n", 2493 ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); 2494 } else { 2495 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), 2496 ceph_cap_string(newcaps)); 2497 /* non-auth MDS is revoking the newly grant caps ? */ 2498 if (cap == ci->i_auth_cap && 2499 __ceph_caps_revoking_other(ci, cap, newcaps)) 2500 check_caps = 2; 2501 2502 cap->issued = newcaps; 2503 cap->implemented |= newcaps; /* add bits only, to 2504 * avoid stepping on a 2505 * pending revocation */ 2506 wake = 1; 2507 } 2508 BUG_ON(cap->issued & ~cap->implemented); 2509 2510 spin_unlock(&ci->i_ceph_lock); 2511 if (writeback) 2512 /* 2513 * queue inode for writeback: we can't actually call 2514 * filemap_write_and_wait, etc. from message handler 2515 * context. 2516 */ 2517 ceph_queue_writeback(inode); 2518 if (queue_invalidate) 2519 ceph_queue_invalidate(inode); 2520 if (wake) 2521 wake_up_all(&ci->i_cap_wq); 2522 2523 if (check_caps == 1) 2524 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY, 2525 session); 2526 else if (check_caps == 2) 2527 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session); 2528 else 2529 mutex_unlock(&session->s_mutex); 2530 } 2531 2532 /* 2533 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the 2534 * MDS has been safely committed. 2535 */ 2536 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, 2537 struct ceph_mds_caps *m, 2538 struct ceph_mds_session *session, 2539 struct ceph_cap *cap) 2540 __releases(ci->i_ceph_lock) 2541 { 2542 struct ceph_inode_info *ci = ceph_inode(inode); 2543 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 2544 unsigned seq = le32_to_cpu(m->seq); 2545 int dirty = le32_to_cpu(m->dirty); 2546 int cleaned = 0; 2547 int drop = 0; 2548 int i; 2549 2550 for (i = 0; i < CEPH_CAP_BITS; i++) 2551 if ((dirty & (1 << i)) && 2552 flush_tid == ci->i_cap_flush_tid[i]) 2553 cleaned |= 1 << i; 2554 2555 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s," 2556 " flushing %s -> %s\n", 2557 inode, session->s_mds, seq, ceph_cap_string(dirty), 2558 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps), 2559 ceph_cap_string(ci->i_flushing_caps & ~cleaned)); 2560 2561 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned)) 2562 goto out; 2563 2564 ci->i_flushing_caps &= ~cleaned; 2565 2566 spin_lock(&mdsc->cap_dirty_lock); 2567 if (ci->i_flushing_caps == 0) { 2568 list_del_init(&ci->i_flushing_item); 2569 if (!list_empty(&session->s_cap_flushing)) 2570 dout(" mds%d still flushing cap on %p\n", 2571 session->s_mds, 2572 &list_entry(session->s_cap_flushing.next, 2573 struct ceph_inode_info, 2574 i_flushing_item)->vfs_inode); 2575 mdsc->num_cap_flushing--; 2576 wake_up_all(&mdsc->cap_flushing_wq); 2577 dout(" inode %p now !flushing\n", inode); 2578 2579 if (ci->i_dirty_caps == 0) { 2580 dout(" inode %p now clean\n", inode); 2581 BUG_ON(!list_empty(&ci->i_dirty_item)); 2582 drop = 1; 2583 if (ci->i_wrbuffer_ref_head == 0) { 2584 BUG_ON(!ci->i_head_snapc); 2585 ceph_put_snap_context(ci->i_head_snapc); 2586 ci->i_head_snapc = NULL; 2587 } 2588 } else { 2589 BUG_ON(list_empty(&ci->i_dirty_item)); 2590 } 2591 } 2592 spin_unlock(&mdsc->cap_dirty_lock); 2593 wake_up_all(&ci->i_cap_wq); 2594 2595 out: 2596 spin_unlock(&ci->i_ceph_lock); 2597 if (drop) 2598 iput(inode); 2599 } 2600 2601 /* 2602 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can 2603 * throw away our cap_snap. 2604 * 2605 * Caller hold s_mutex. 2606 */ 2607 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, 2608 struct ceph_mds_caps *m, 2609 struct ceph_mds_session *session) 2610 { 2611 struct ceph_inode_info *ci = ceph_inode(inode); 2612 u64 follows = le64_to_cpu(m->snap_follows); 2613 struct ceph_cap_snap *capsnap; 2614 int drop = 0; 2615 2616 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n", 2617 inode, ci, session->s_mds, follows); 2618 2619 spin_lock(&ci->i_ceph_lock); 2620 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 2621 if (capsnap->follows == follows) { 2622 if (capsnap->flush_tid != flush_tid) { 2623 dout(" cap_snap %p follows %lld tid %lld !=" 2624 " %lld\n", capsnap, follows, 2625 flush_tid, capsnap->flush_tid); 2626 break; 2627 } 2628 WARN_ON(capsnap->dirty_pages || capsnap->writing); 2629 dout(" removing %p cap_snap %p follows %lld\n", 2630 inode, capsnap, follows); 2631 ceph_put_snap_context(capsnap->context); 2632 list_del(&capsnap->ci_item); 2633 list_del(&capsnap->flushing_item); 2634 ceph_put_cap_snap(capsnap); 2635 drop = 1; 2636 break; 2637 } else { 2638 dout(" skipping cap_snap %p follows %lld\n", 2639 capsnap, capsnap->follows); 2640 } 2641 } 2642 spin_unlock(&ci->i_ceph_lock); 2643 if (drop) 2644 iput(inode); 2645 } 2646 2647 /* 2648 * Handle TRUNC from MDS, indicating file truncation. 2649 * 2650 * caller hold s_mutex. 2651 */ 2652 static void handle_cap_trunc(struct inode *inode, 2653 struct ceph_mds_caps *trunc, 2654 struct ceph_mds_session *session) 2655 __releases(ci->i_ceph_lock) 2656 { 2657 struct ceph_inode_info *ci = ceph_inode(inode); 2658 int mds = session->s_mds; 2659 int seq = le32_to_cpu(trunc->seq); 2660 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); 2661 u64 truncate_size = le64_to_cpu(trunc->truncate_size); 2662 u64 size = le64_to_cpu(trunc->size); 2663 int implemented = 0; 2664 int dirty = __ceph_caps_dirty(ci); 2665 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); 2666 int queue_trunc = 0; 2667 2668 issued |= implemented | dirty; 2669 2670 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n", 2671 inode, mds, seq, truncate_size, truncate_seq); 2672 queue_trunc = ceph_fill_file_size(inode, issued, 2673 truncate_seq, truncate_size, size); 2674 spin_unlock(&ci->i_ceph_lock); 2675 2676 if (queue_trunc) 2677 ceph_queue_vmtruncate(inode); 2678 } 2679 2680 /* 2681 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a 2682 * different one. If we are the most recent migration we've seen (as 2683 * indicated by mseq), make note of the migrating cap bits for the 2684 * duration (until we see the corresponding IMPORT). 2685 * 2686 * caller holds s_mutex 2687 */ 2688 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 2689 struct ceph_mds_session *session, 2690 int *open_target_sessions) 2691 { 2692 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 2693 struct ceph_inode_info *ci = ceph_inode(inode); 2694 int mds = session->s_mds; 2695 unsigned mseq = le32_to_cpu(ex->migrate_seq); 2696 struct ceph_cap *cap = NULL, *t; 2697 struct rb_node *p; 2698 int remember = 1; 2699 2700 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n", 2701 inode, ci, mds, mseq); 2702 2703 spin_lock(&ci->i_ceph_lock); 2704 2705 /* make sure we haven't seen a higher mseq */ 2706 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { 2707 t = rb_entry(p, struct ceph_cap, ci_node); 2708 if (ceph_seq_cmp(t->mseq, mseq) > 0) { 2709 dout(" higher mseq on cap from mds%d\n", 2710 t->session->s_mds); 2711 remember = 0; 2712 } 2713 if (t->session->s_mds == mds) 2714 cap = t; 2715 } 2716 2717 if (cap) { 2718 if (remember) { 2719 /* make note */ 2720 ci->i_cap_exporting_mds = mds; 2721 ci->i_cap_exporting_mseq = mseq; 2722 ci->i_cap_exporting_issued = cap->issued; 2723 2724 /* 2725 * make sure we have open sessions with all possible 2726 * export targets, so that we get the matching IMPORT 2727 */ 2728 *open_target_sessions = 1; 2729 2730 /* 2731 * we can't flush dirty caps that we've seen the 2732 * EXPORT but no IMPORT for 2733 */ 2734 spin_lock(&mdsc->cap_dirty_lock); 2735 if (!list_empty(&ci->i_dirty_item)) { 2736 dout(" moving %p to cap_dirty_migrating\n", 2737 inode); 2738 list_move(&ci->i_dirty_item, 2739 &mdsc->cap_dirty_migrating); 2740 } 2741 spin_unlock(&mdsc->cap_dirty_lock); 2742 } 2743 __ceph_remove_cap(cap); 2744 } 2745 /* else, we already released it */ 2746 2747 spin_unlock(&ci->i_ceph_lock); 2748 } 2749 2750 /* 2751 * Handle cap IMPORT. If there are temp bits from an older EXPORT, 2752 * clean them up. 2753 * 2754 * caller holds s_mutex. 2755 */ 2756 static void handle_cap_import(struct ceph_mds_client *mdsc, 2757 struct inode *inode, struct ceph_mds_caps *im, 2758 struct ceph_mds_session *session, 2759 void *snaptrace, int snaptrace_len) 2760 { 2761 struct ceph_inode_info *ci = ceph_inode(inode); 2762 int mds = session->s_mds; 2763 unsigned issued = le32_to_cpu(im->caps); 2764 unsigned wanted = le32_to_cpu(im->wanted); 2765 unsigned seq = le32_to_cpu(im->seq); 2766 unsigned mseq = le32_to_cpu(im->migrate_seq); 2767 u64 realmino = le64_to_cpu(im->realm); 2768 u64 cap_id = le64_to_cpu(im->cap_id); 2769 2770 if (ci->i_cap_exporting_mds >= 0 && 2771 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) { 2772 dout("handle_cap_import inode %p ci %p mds%d mseq %d" 2773 " - cleared exporting from mds%d\n", 2774 inode, ci, mds, mseq, 2775 ci->i_cap_exporting_mds); 2776 ci->i_cap_exporting_issued = 0; 2777 ci->i_cap_exporting_mseq = 0; 2778 ci->i_cap_exporting_mds = -1; 2779 2780 spin_lock(&mdsc->cap_dirty_lock); 2781 if (!list_empty(&ci->i_dirty_item)) { 2782 dout(" moving %p back to cap_dirty\n", inode); 2783 list_move(&ci->i_dirty_item, &mdsc->cap_dirty); 2784 } 2785 spin_unlock(&mdsc->cap_dirty_lock); 2786 } else { 2787 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n", 2788 inode, ci, mds, mseq); 2789 } 2790 2791 down_write(&mdsc->snap_rwsem); 2792 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len, 2793 false); 2794 downgrade_write(&mdsc->snap_rwsem); 2795 ceph_add_cap(inode, session, cap_id, -1, 2796 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH, 2797 NULL /* no caps context */); 2798 kick_flushing_inode_caps(mdsc, session, inode); 2799 up_read(&mdsc->snap_rwsem); 2800 2801 /* make sure we re-request max_size, if necessary */ 2802 spin_lock(&ci->i_ceph_lock); 2803 ci->i_wanted_max_size = 0; /* reset */ 2804 ci->i_requested_max_size = 0; 2805 spin_unlock(&ci->i_ceph_lock); 2806 } 2807 2808 /* 2809 * Handle a caps message from the MDS. 2810 * 2811 * Identify the appropriate session, inode, and call the right handler 2812 * based on the cap op. 2813 */ 2814 void ceph_handle_caps(struct ceph_mds_session *session, 2815 struct ceph_msg *msg) 2816 { 2817 struct ceph_mds_client *mdsc = session->s_mdsc; 2818 struct super_block *sb = mdsc->fsc->sb; 2819 struct inode *inode; 2820 struct ceph_inode_info *ci; 2821 struct ceph_cap *cap; 2822 struct ceph_mds_caps *h; 2823 int mds = session->s_mds; 2824 int op; 2825 u32 seq, mseq; 2826 struct ceph_vino vino; 2827 u64 cap_id; 2828 u64 size, max_size; 2829 u64 tid; 2830 void *snaptrace; 2831 size_t snaptrace_len; 2832 void *flock; 2833 u32 flock_len; 2834 int open_target_sessions = 0; 2835 2836 dout("handle_caps from mds%d\n", mds); 2837 2838 /* decode */ 2839 tid = le64_to_cpu(msg->hdr.tid); 2840 if (msg->front.iov_len < sizeof(*h)) 2841 goto bad; 2842 h = msg->front.iov_base; 2843 op = le32_to_cpu(h->op); 2844 vino.ino = le64_to_cpu(h->ino); 2845 vino.snap = CEPH_NOSNAP; 2846 cap_id = le64_to_cpu(h->cap_id); 2847 seq = le32_to_cpu(h->seq); 2848 mseq = le32_to_cpu(h->migrate_seq); 2849 size = le64_to_cpu(h->size); 2850 max_size = le64_to_cpu(h->max_size); 2851 2852 snaptrace = h + 1; 2853 snaptrace_len = le32_to_cpu(h->snap_trace_len); 2854 2855 if (le16_to_cpu(msg->hdr.version) >= 2) { 2856 void *p, *end; 2857 2858 p = snaptrace + snaptrace_len; 2859 end = msg->front.iov_base + msg->front.iov_len; 2860 ceph_decode_32_safe(&p, end, flock_len, bad); 2861 flock = p; 2862 } else { 2863 flock = NULL; 2864 flock_len = 0; 2865 } 2866 2867 mutex_lock(&session->s_mutex); 2868 session->s_seq++; 2869 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, 2870 (unsigned)seq); 2871 2872 if (op == CEPH_CAP_OP_IMPORT) 2873 ceph_add_cap_releases(mdsc, session); 2874 2875 /* lookup ino */ 2876 inode = ceph_find_inode(sb, vino); 2877 ci = ceph_inode(inode); 2878 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino, 2879 vino.snap, inode); 2880 if (!inode) { 2881 dout(" i don't have ino %llx\n", vino.ino); 2882 2883 if (op == CEPH_CAP_OP_IMPORT) 2884 __queue_cap_release(session, vino.ino, cap_id, 2885 mseq, seq); 2886 goto flush_cap_releases; 2887 } 2888 2889 /* these will work even if we don't have a cap yet */ 2890 switch (op) { 2891 case CEPH_CAP_OP_FLUSHSNAP_ACK: 2892 handle_cap_flushsnap_ack(inode, tid, h, session); 2893 goto done; 2894 2895 case CEPH_CAP_OP_EXPORT: 2896 handle_cap_export(inode, h, session, &open_target_sessions); 2897 goto done; 2898 2899 case CEPH_CAP_OP_IMPORT: 2900 handle_cap_import(mdsc, inode, h, session, 2901 snaptrace, snaptrace_len); 2902 } 2903 2904 /* the rest require a cap */ 2905 spin_lock(&ci->i_ceph_lock); 2906 cap = __get_cap_for_mds(ceph_inode(inode), mds); 2907 if (!cap) { 2908 dout(" no cap on %p ino %llx.%llx from mds%d\n", 2909 inode, ceph_ino(inode), ceph_snap(inode), mds); 2910 spin_unlock(&ci->i_ceph_lock); 2911 goto flush_cap_releases; 2912 } 2913 2914 /* note that each of these drops i_ceph_lock for us */ 2915 switch (op) { 2916 case CEPH_CAP_OP_REVOKE: 2917 case CEPH_CAP_OP_GRANT: 2918 case CEPH_CAP_OP_IMPORT: 2919 handle_cap_grant(inode, h, session, cap, msg->middle); 2920 goto done_unlocked; 2921 2922 case CEPH_CAP_OP_FLUSH_ACK: 2923 handle_cap_flush_ack(inode, tid, h, session, cap); 2924 break; 2925 2926 case CEPH_CAP_OP_TRUNC: 2927 handle_cap_trunc(inode, h, session); 2928 break; 2929 2930 default: 2931 spin_unlock(&ci->i_ceph_lock); 2932 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op, 2933 ceph_cap_op_name(op)); 2934 } 2935 2936 goto done; 2937 2938 flush_cap_releases: 2939 /* 2940 * send any full release message to try to move things 2941 * along for the mds (who clearly thinks we still have this 2942 * cap). 2943 */ 2944 ceph_add_cap_releases(mdsc, session); 2945 ceph_send_cap_releases(mdsc, session); 2946 2947 done: 2948 mutex_unlock(&session->s_mutex); 2949 done_unlocked: 2950 if (inode) 2951 iput(inode); 2952 if (open_target_sessions) 2953 ceph_mdsc_open_export_target_sessions(mdsc, session); 2954 return; 2955 2956 bad: 2957 pr_err("ceph_handle_caps: corrupt message\n"); 2958 ceph_msg_dump(msg); 2959 return; 2960 } 2961 2962 /* 2963 * Delayed work handler to process end of delayed cap release LRU list. 2964 */ 2965 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc) 2966 { 2967 struct ceph_inode_info *ci; 2968 int flags = CHECK_CAPS_NODELAY; 2969 2970 dout("check_delayed_caps\n"); 2971 while (1) { 2972 spin_lock(&mdsc->cap_delay_lock); 2973 if (list_empty(&mdsc->cap_delay_list)) 2974 break; 2975 ci = list_first_entry(&mdsc->cap_delay_list, 2976 struct ceph_inode_info, 2977 i_cap_delay_list); 2978 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && 2979 time_before(jiffies, ci->i_hold_caps_max)) 2980 break; 2981 list_del_init(&ci->i_cap_delay_list); 2982 spin_unlock(&mdsc->cap_delay_lock); 2983 dout("check_delayed_caps on %p\n", &ci->vfs_inode); 2984 ceph_check_caps(ci, flags, NULL); 2985 } 2986 spin_unlock(&mdsc->cap_delay_lock); 2987 } 2988 2989 /* 2990 * Flush all dirty caps to the mds 2991 */ 2992 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) 2993 { 2994 struct ceph_inode_info *ci; 2995 struct inode *inode; 2996 2997 dout("flush_dirty_caps\n"); 2998 spin_lock(&mdsc->cap_dirty_lock); 2999 while (!list_empty(&mdsc->cap_dirty)) { 3000 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info, 3001 i_dirty_item); 3002 inode = &ci->vfs_inode; 3003 ihold(inode); 3004 dout("flush_dirty_caps %p\n", inode); 3005 spin_unlock(&mdsc->cap_dirty_lock); 3006 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL); 3007 iput(inode); 3008 spin_lock(&mdsc->cap_dirty_lock); 3009 } 3010 spin_unlock(&mdsc->cap_dirty_lock); 3011 dout("flush_dirty_caps done\n"); 3012 } 3013 3014 /* 3015 * Drop open file reference. If we were the last open file, 3016 * we may need to release capabilities to the MDS (or schedule 3017 * their delayed release). 3018 */ 3019 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode) 3020 { 3021 struct inode *inode = &ci->vfs_inode; 3022 int last = 0; 3023 3024 spin_lock(&ci->i_ceph_lock); 3025 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode, 3026 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1); 3027 BUG_ON(ci->i_nr_by_mode[fmode] == 0); 3028 if (--ci->i_nr_by_mode[fmode] == 0) 3029 last++; 3030 spin_unlock(&ci->i_ceph_lock); 3031 3032 if (last && ci->i_vino.snap == CEPH_NOSNAP) 3033 ceph_check_caps(ci, 0, NULL); 3034 } 3035 3036 /* 3037 * Helpers for embedding cap and dentry lease releases into mds 3038 * requests. 3039 * 3040 * @force is used by dentry_release (below) to force inclusion of a 3041 * record for the directory inode, even when there aren't any caps to 3042 * drop. 3043 */ 3044 int ceph_encode_inode_release(void **p, struct inode *inode, 3045 int mds, int drop, int unless, int force) 3046 { 3047 struct ceph_inode_info *ci = ceph_inode(inode); 3048 struct ceph_cap *cap; 3049 struct ceph_mds_request_release *rel = *p; 3050 int used, dirty; 3051 int ret = 0; 3052 3053 spin_lock(&ci->i_ceph_lock); 3054 used = __ceph_caps_used(ci); 3055 dirty = __ceph_caps_dirty(ci); 3056 3057 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n", 3058 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop), 3059 ceph_cap_string(unless)); 3060 3061 /* only drop unused, clean caps */ 3062 drop &= ~(used | dirty); 3063 3064 cap = __get_cap_for_mds(ci, mds); 3065 if (cap && __cap_is_valid(cap)) { 3066 if (force || 3067 ((cap->issued & drop) && 3068 (cap->issued & unless) == 0)) { 3069 if ((cap->issued & drop) && 3070 (cap->issued & unless) == 0) { 3071 int wanted = __ceph_caps_wanted(ci); 3072 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0) 3073 wanted |= cap->mds_wanted; 3074 dout("encode_inode_release %p cap %p " 3075 "%s -> %s, wanted %s -> %s\n", inode, cap, 3076 ceph_cap_string(cap->issued), 3077 ceph_cap_string(cap->issued & ~drop), 3078 ceph_cap_string(cap->mds_wanted), 3079 ceph_cap_string(wanted)); 3080 3081 cap->issued &= ~drop; 3082 cap->implemented &= ~drop; 3083 cap->mds_wanted = wanted; 3084 } else { 3085 dout("encode_inode_release %p cap %p %s" 3086 " (force)\n", inode, cap, 3087 ceph_cap_string(cap->issued)); 3088 } 3089 3090 rel->ino = cpu_to_le64(ceph_ino(inode)); 3091 rel->cap_id = cpu_to_le64(cap->cap_id); 3092 rel->seq = cpu_to_le32(cap->seq); 3093 rel->issue_seq = cpu_to_le32(cap->issue_seq), 3094 rel->mseq = cpu_to_le32(cap->mseq); 3095 rel->caps = cpu_to_le32(cap->issued); 3096 rel->wanted = cpu_to_le32(cap->mds_wanted); 3097 rel->dname_len = 0; 3098 rel->dname_seq = 0; 3099 *p += sizeof(*rel); 3100 ret = 1; 3101 } else { 3102 dout("encode_inode_release %p cap %p %s\n", 3103 inode, cap, ceph_cap_string(cap->issued)); 3104 } 3105 } 3106 spin_unlock(&ci->i_ceph_lock); 3107 return ret; 3108 } 3109 3110 int ceph_encode_dentry_release(void **p, struct dentry *dentry, 3111 int mds, int drop, int unless) 3112 { 3113 struct inode *dir = dentry->d_parent->d_inode; 3114 struct ceph_mds_request_release *rel = *p; 3115 struct ceph_dentry_info *di = ceph_dentry(dentry); 3116 int force = 0; 3117 int ret; 3118 3119 /* 3120 * force an record for the directory caps if we have a dentry lease. 3121 * this is racy (can't take i_ceph_lock and d_lock together), but it 3122 * doesn't have to be perfect; the mds will revoke anything we don't 3123 * release. 3124 */ 3125 spin_lock(&dentry->d_lock); 3126 if (di->lease_session && di->lease_session->s_mds == mds) 3127 force = 1; 3128 spin_unlock(&dentry->d_lock); 3129 3130 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); 3131 3132 spin_lock(&dentry->d_lock); 3133 if (ret && di->lease_session && di->lease_session->s_mds == mds) { 3134 dout("encode_dentry_release %p mds%d seq %d\n", 3135 dentry, mds, (int)di->lease_seq); 3136 rel->dname_len = cpu_to_le32(dentry->d_name.len); 3137 memcpy(*p, dentry->d_name.name, dentry->d_name.len); 3138 *p += dentry->d_name.len; 3139 rel->dname_seq = cpu_to_le32(di->lease_seq); 3140 __ceph_mdsc_drop_dentry_lease(dentry); 3141 } 3142 spin_unlock(&dentry->d_lock); 3143 return ret; 3144 } 3145