1 /* 2 * Copyright (c) 2011-2013 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@dragonflybsd.org> 6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 #include <sys/cdefs.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/types.h> 39 #include <sys/lock.h> 40 #include <sys/uuid.h> 41 42 #include "hammer2.h" 43 44 RB_GENERATE2(hammer2_inode_tree, hammer2_inode, rbnode, hammer2_inode_cmp, 45 hammer2_tid_t, inum); 46 47 int 48 hammer2_inode_cmp(hammer2_inode_t *ip1, hammer2_inode_t *ip2) 49 { 50 if (ip1->inum < ip2->inum) 51 return(-1); 52 if (ip1->inum > ip2->inum) 53 return(1); 54 return(0); 55 } 56 57 /* 58 * HAMMER2 inode locks 59 * 60 * HAMMER2 offers shared locks and exclusive locks on inodes. 61 * 62 * An inode's ip->chain pointer is resolved and stable while an inode is 63 * locked, and can be cleaned out at any time (become NULL) when an inode 64 * is not locked. 65 * 66 * This function handles duplication races which can cause ip's cached 67 * chain to become stale. 68 * 69 * The underlying chain is also locked and returned. 70 * 71 * NOTE: We don't combine the inode/chain lock because putting away an 72 * inode would otherwise confuse multiple lock holders of the inode. 73 */ 74 hammer2_chain_t * 75 hammer2_inode_lock_ex(hammer2_inode_t *ip) 76 { 77 hammer2_chain_t *chain; 78 hammer2_chain_core_t *core; 79 80 hammer2_inode_ref(ip); 81 ccms_thread_lock(&ip->topo_cst, CCMS_STATE_EXCLUSIVE); 82 83 chain = ip->chain; 84 core = chain->core; 85 for (;;) { 86 if (chain->flags & HAMMER2_CHAIN_DUPLICATED) { 87 spin_lock(&core->cst.spin); 88 while (chain->flags & HAMMER2_CHAIN_DUPLICATED) 89 chain = TAILQ_NEXT(chain, core_entry); 90 hammer2_chain_ref(chain); 91 spin_unlock(&core->cst.spin); 92 hammer2_inode_repoint(ip, NULL, chain); 93 hammer2_chain_drop(chain); 94 } 95 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS); 96 if ((chain->flags & HAMMER2_CHAIN_DUPLICATED) == 0) 97 break; 98 hammer2_chain_unlock(chain); 99 } 100 return (chain); 101 } 102 103 void 104 hammer2_inode_unlock_ex(hammer2_inode_t *ip, hammer2_chain_t *chain) 105 { 106 /* 107 * XXX this will catch parent directories too which we don't 108 * really want. 109 */ 110 if (chain) 111 hammer2_chain_unlock(chain); 112 ccms_thread_unlock(&ip->topo_cst); 113 hammer2_inode_drop(ip); 114 } 115 116 /* 117 * NOTE: We don't combine the inode/chain lock because putting away an 118 * inode would otherwise confuse multiple lock holders of the inode. 119 * 120 * Shared locks are especially sensitive to having too many shared 121 * lock counts (from the same thread) on certain paths which might 122 * need to upgrade them. Only one count of a shared lock can be 123 * upgraded. 124 */ 125 hammer2_chain_t * 126 hammer2_inode_lock_sh(hammer2_inode_t *ip) 127 { 128 hammer2_chain_t *chain; 129 130 hammer2_inode_ref(ip); 131 for (;;) { 132 ccms_thread_lock(&ip->topo_cst, CCMS_STATE_SHARED); 133 134 chain = ip->chain; 135 KKASSERT(chain != NULL); /* for now */ 136 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS | 137 HAMMER2_RESOLVE_SHARED); 138 139 /* 140 * Resolve duplication races 141 */ 142 if ((chain->flags & HAMMER2_CHAIN_DUPLICATED) == 0) 143 break; 144 hammer2_chain_unlock(chain); 145 ccms_thread_unlock(&ip->topo_cst); 146 chain = hammer2_inode_lock_ex(ip); 147 hammer2_inode_unlock_ex(ip, chain); 148 } 149 return (chain); 150 } 151 152 void 153 hammer2_inode_unlock_sh(hammer2_inode_t *ip, hammer2_chain_t *chain) 154 { 155 if (chain) 156 hammer2_chain_unlock(chain); 157 ccms_thread_unlock(&ip->topo_cst); 158 hammer2_inode_drop(ip); 159 } 160 161 ccms_state_t 162 hammer2_inode_lock_temp_release(hammer2_inode_t *ip) 163 { 164 return(ccms_thread_lock_temp_release(&ip->topo_cst)); 165 } 166 167 void 168 hammer2_inode_lock_temp_restore(hammer2_inode_t *ip, ccms_state_t ostate) 169 { 170 ccms_thread_lock_temp_restore(&ip->topo_cst, ostate); 171 } 172 173 ccms_state_t 174 hammer2_inode_lock_upgrade(hammer2_inode_t *ip) 175 { 176 return(ccms_thread_lock_upgrade(&ip->topo_cst)); 177 } 178 179 void 180 hammer2_inode_lock_downgrade(hammer2_inode_t *ip, ccms_state_t ostate) 181 { 182 ccms_thread_lock_downgrade(&ip->topo_cst, ostate); 183 } 184 185 /* 186 * Lookup an inode by inode number 187 */ 188 hammer2_inode_t * 189 hammer2_inode_lookup(hammer2_pfsmount_t *pmp, hammer2_tid_t inum) 190 { 191 hammer2_inode_t *ip; 192 193 if (pmp) { 194 spin_lock(&pmp->inum_spin); 195 ip = RB_LOOKUP(hammer2_inode_tree, &pmp->inum_tree, inum); 196 if (ip) 197 hammer2_inode_ref(ip); 198 spin_unlock(&pmp->inum_spin); 199 } else { 200 ip = NULL; 201 } 202 return(ip); 203 } 204 205 /* 206 * Adding a ref to an inode is only legal if the inode already has at least 207 * one ref. 208 */ 209 void 210 hammer2_inode_ref(hammer2_inode_t *ip) 211 { 212 atomic_add_int(&ip->refs, 1); 213 } 214 215 /* 216 * Drop an inode reference, freeing the inode when the last reference goes 217 * away. 218 */ 219 void 220 hammer2_inode_drop(hammer2_inode_t *ip) 221 { 222 hammer2_pfsmount_t *pmp; 223 hammer2_inode_t *pip; 224 u_int refs; 225 226 while (ip) { 227 refs = ip->refs; 228 cpu_ccfence(); 229 if (refs == 1) { 230 /* 231 * Transition to zero, must interlock with 232 * the inode inumber lookup tree (if applicable). 233 * 234 * NOTE: The super-root inode has no pmp. 235 */ 236 pmp = ip->pmp; 237 if (pmp) 238 spin_lock(&pmp->inum_spin); 239 240 if (atomic_cmpset_int(&ip->refs, 1, 0)) { 241 KKASSERT(ip->topo_cst.count == 0); 242 if (ip->flags & HAMMER2_INODE_ONRBTREE) { 243 atomic_clear_int(&ip->flags, 244 HAMMER2_INODE_ONRBTREE); 245 RB_REMOVE(hammer2_inode_tree, 246 &pmp->inum_tree, ip); 247 } 248 if (pmp) 249 spin_unlock(&pmp->inum_spin); 250 251 pip = ip->pip; 252 ip->pip = NULL; 253 ip->pmp = NULL; 254 255 /* 256 * Cleaning out ip->chain isn't entirely 257 * trivial. 258 */ 259 hammer2_inode_repoint(ip, NULL, NULL); 260 261 /* 262 * We have to drop pip (if non-NULL) to 263 * dispose of our implied reference from 264 * ip->pip. We can simply loop on it. 265 */ 266 if (pmp) { 267 KKASSERT((ip->flags & 268 HAMMER2_INODE_SROOT) == 0); 269 kfree(ip, pmp->minode); 270 atomic_add_long(&pmp->inmem_inodes, -1); 271 } else { 272 KKASSERT(ip->flags & 273 HAMMER2_INODE_SROOT); 274 kfree(ip, M_HAMMER2); 275 } 276 ip = pip; 277 /* continue with pip (can be NULL) */ 278 } else { 279 if (pmp) 280 spin_unlock(&ip->pmp->inum_spin); 281 } 282 } else { 283 /* 284 * Non zero transition 285 */ 286 if (atomic_cmpset_int(&ip->refs, refs, refs - 1)) 287 break; 288 } 289 } 290 } 291 292 /* 293 * Get the vnode associated with the given inode, allocating the vnode if 294 * necessary. The vnode will be returned exclusively locked. 295 * 296 * The caller must lock the inode (shared or exclusive). 297 * 298 * Great care must be taken to avoid deadlocks and vnode acquisition/reclaim 299 * races. 300 */ 301 struct vnode * 302 hammer2_igetv(hammer2_inode_t *ip, int *errorp) 303 { 304 hammer2_inode_data_t *ipdata; 305 hammer2_pfsmount_t *pmp; 306 struct vnode *vp; 307 ccms_state_t ostate; 308 309 pmp = ip->pmp; 310 KKASSERT(pmp != NULL); 311 *errorp = 0; 312 ipdata = &ip->chain->data->ipdata; 313 314 for (;;) { 315 /* 316 * Attempt to reuse an existing vnode assignment. It is 317 * possible to race a reclaim so the vget() may fail. The 318 * inode must be unlocked during the vget() to avoid a 319 * deadlock against a reclaim. 320 */ 321 vp = ip->vp; 322 if (vp) { 323 /* 324 * Inode must be unlocked during the vget() to avoid 325 * possible deadlocks, but leave the ip ref intact. 326 * 327 * vnode is held to prevent destruction during the 328 * vget(). The vget() can still fail if we lost 329 * a reclaim race on the vnode. 330 */ 331 vhold_interlocked(vp); 332 ostate = hammer2_inode_lock_temp_release(ip); 333 if (vget(vp, LK_EXCLUSIVE)) { 334 vdrop(vp); 335 hammer2_inode_lock_temp_restore(ip, ostate); 336 continue; 337 } 338 hammer2_inode_lock_temp_restore(ip, ostate); 339 vdrop(vp); 340 /* vp still locked and ref from vget */ 341 if (ip->vp != vp) { 342 kprintf("hammer2: igetv race %p/%p\n", 343 ip->vp, vp); 344 vput(vp); 345 continue; 346 } 347 *errorp = 0; 348 break; 349 } 350 351 /* 352 * No vnode exists, allocate a new vnode. Beware of 353 * allocation races. This function will return an 354 * exclusively locked and referenced vnode. 355 */ 356 *errorp = getnewvnode(VT_HAMMER2, pmp->mp, &vp, 0, 0); 357 if (*errorp) { 358 kprintf("hammer2: igetv getnewvnode failed %d\n", 359 *errorp); 360 vp = NULL; 361 break; 362 } 363 364 /* 365 * Lock the inode and check for an allocation race. 366 */ 367 ostate = hammer2_inode_lock_upgrade(ip); 368 if (ip->vp != NULL) { 369 vp->v_type = VBAD; 370 vx_put(vp); 371 hammer2_inode_lock_downgrade(ip, ostate); 372 continue; 373 } 374 375 switch (ipdata->type) { 376 case HAMMER2_OBJTYPE_DIRECTORY: 377 vp->v_type = VDIR; 378 break; 379 case HAMMER2_OBJTYPE_REGFILE: 380 vp->v_type = VREG; 381 vinitvmio(vp, ipdata->size, 382 HAMMER2_LBUFSIZE, 383 (int)ipdata->size & HAMMER2_LBUFMASK); 384 break; 385 case HAMMER2_OBJTYPE_SOFTLINK: 386 /* 387 * XXX for now we are using the generic file_read 388 * and file_write code so we need a buffer cache 389 * association. 390 */ 391 vp->v_type = VLNK; 392 vinitvmio(vp, ipdata->size, 393 HAMMER2_LBUFSIZE, 394 (int)ipdata->size & HAMMER2_LBUFMASK); 395 break; 396 /* XXX FIFO */ 397 default: 398 panic("hammer2: unhandled objtype %d", ipdata->type); 399 break; 400 } 401 402 if (ip == pmp->iroot) 403 vsetflags(vp, VROOT); 404 405 vp->v_data = ip; 406 ip->vp = vp; 407 hammer2_inode_ref(ip); /* vp association */ 408 hammer2_inode_lock_downgrade(ip, ostate); 409 break; 410 } 411 412 /* 413 * Return non-NULL vp and *errorp == 0, or NULL vp and *errorp != 0. 414 */ 415 if (hammer2_debug & 0x0002) { 416 kprintf("igetv vp %p refs %d aux %d\n", 417 vp, vp->v_sysref.refcnt, vp->v_auxrefs); 418 } 419 return (vp); 420 } 421 422 /* 423 * The passed-in chain must be locked and the returned inode will also be 424 * locked. This routine typically locates or allocates the inode, assigns 425 * ip->chain (adding a ref to chain if necessary), and returns the inode. 426 * 427 * The hammer2_inode structure regulates the interface between the high level 428 * kernel VNOPS API and the filesystem backend (the chains). 429 * 430 * WARNING! This routine sucks up the chain's lock (makes it part of the 431 * inode lock from the point of view of the inode lock API), 432 * so callers need to be careful. 433 * 434 * WARNING! The mount code is allowed to pass dip == NULL for iroot and 435 * is allowed to pass pmp == NULL and dip == NULL for sroot. 436 */ 437 hammer2_inode_t * 438 hammer2_inode_get(hammer2_pfsmount_t *pmp, hammer2_inode_t *dip, 439 hammer2_chain_t *chain) 440 { 441 hammer2_inode_t *nip; 442 443 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_INODE); 444 445 /* 446 * Interlocked lookup/ref of the inode. This code is only needed 447 * when looking up inodes with nlinks != 0 (TODO: optimize out 448 * otherwise and test for duplicates). 449 */ 450 again: 451 for (;;) { 452 nip = hammer2_inode_lookup(pmp, chain->data->ipdata.inum); 453 if (nip == NULL) 454 break; 455 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE); 456 if ((nip->flags & HAMMER2_INODE_ONRBTREE) == 0) { /* race */ 457 ccms_thread_unlock(&nip->topo_cst); 458 hammer2_inode_drop(nip); 459 continue; 460 } 461 if (nip->chain != chain) 462 hammer2_inode_repoint(nip, NULL, chain); 463 464 /* 465 * Consolidated nip/nip->chain is locked (chain locked 466 * by caller). 467 */ 468 return nip; 469 } 470 471 /* 472 * We couldn't find the inode number, create a new inode. 473 */ 474 if (pmp) { 475 nip = kmalloc(sizeof(*nip), pmp->minode, M_WAITOK | M_ZERO); 476 atomic_add_long(&pmp->inmem_inodes, 1); 477 hammer2_chain_memory_wakeup(pmp); 478 } else { 479 nip = kmalloc(sizeof(*nip), M_HAMMER2, M_WAITOK | M_ZERO); 480 nip->flags = HAMMER2_INODE_SROOT; 481 } 482 nip->inum = chain->data->ipdata.inum; 483 nip->size = chain->data->ipdata.size; 484 nip->mtime = chain->data->ipdata.mtime; 485 hammer2_inode_repoint(nip, NULL, chain); 486 nip->pip = dip; /* can be NULL */ 487 if (dip) 488 hammer2_inode_ref(dip); /* ref dip for nip->pip */ 489 490 nip->pmp = pmp; 491 492 /* 493 * ref and lock on nip gives it state compatible to after a 494 * hammer2_inode_lock_ex() call. 495 */ 496 nip->refs = 1; 497 ccms_cst_init(&nip->topo_cst, &nip->chain); 498 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE); 499 /* combination of thread lock and chain lock == inode lock */ 500 501 /* 502 * Attempt to add the inode. If it fails we raced another inode 503 * get. Undo all the work and try again. 504 */ 505 if (pmp) { 506 spin_lock(&pmp->inum_spin); 507 if (RB_INSERT(hammer2_inode_tree, &pmp->inum_tree, nip)) { 508 spin_unlock(&pmp->inum_spin); 509 ccms_thread_unlock(&nip->topo_cst); 510 hammer2_inode_drop(nip); 511 goto again; 512 } 513 atomic_set_int(&nip->flags, HAMMER2_INODE_ONRBTREE); 514 spin_unlock(&pmp->inum_spin); 515 } 516 517 return (nip); 518 } 519 520 /* 521 * Create a new inode in the specified directory using the vattr to 522 * figure out the type of inode. 523 * 524 * If no error occurs the new inode with its chain locked is returned in 525 * *nipp, otherwise an error is returned and *nipp is set to NULL. 526 * 527 * If vap and/or cred are NULL the related fields are not set and the 528 * inode type defaults to a directory. This is used when creating PFSs 529 * under the super-root, so the inode number is set to 1 in this case. 530 * 531 * dip is not locked on entry. 532 */ 533 hammer2_inode_t * 534 hammer2_inode_create(hammer2_trans_t *trans, hammer2_inode_t *dip, 535 struct vattr *vap, struct ucred *cred, 536 const uint8_t *name, size_t name_len, 537 hammer2_chain_t **chainp, int *errorp) 538 { 539 hammer2_inode_data_t *dipdata; 540 hammer2_inode_data_t *nipdata; 541 hammer2_chain_t *chain; 542 hammer2_chain_t *parent; 543 hammer2_inode_t *nip; 544 hammer2_key_t key_dummy; 545 hammer2_key_t lhc; 546 int error; 547 uid_t xuid; 548 uuid_t dip_uid; 549 uuid_t dip_gid; 550 uint32_t dip_mode; 551 uint8_t dip_algo; 552 int cache_index = -1; 553 554 lhc = hammer2_dirhash(name, name_len); 555 *errorp = 0; 556 557 /* 558 * Locate the inode or indirect block to create the new 559 * entry in. At the same time check for key collisions 560 * and iterate until we don't get one. 561 * 562 * NOTE: hidden inodes do not have iterators. 563 */ 564 retry: 565 parent = hammer2_inode_lock_ex(dip); 566 dipdata = &dip->chain->data->ipdata; 567 dip_uid = dipdata->uid; 568 dip_gid = dipdata->gid; 569 dip_mode = dipdata->mode; 570 dip_algo = dipdata->comp_algo; 571 572 error = 0; 573 while (error == 0) { 574 chain = hammer2_chain_lookup(&parent, &key_dummy, 575 lhc, lhc, &cache_index, 0); 576 if (chain == NULL) 577 break; 578 if ((lhc & HAMMER2_DIRHASH_VISIBLE) == 0) 579 error = ENOSPC; 580 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK) 581 error = ENOSPC; 582 hammer2_chain_unlock(chain); 583 chain = NULL; 584 ++lhc; 585 } 586 587 if (error == 0) { 588 error = hammer2_chain_create(trans, &parent, &chain, 589 lhc, 0, 590 HAMMER2_BREF_TYPE_INODE, 591 HAMMER2_INODE_BYTES); 592 } 593 594 /* 595 * Cleanup and handle retries. 596 */ 597 if (error == EAGAIN) { 598 hammer2_chain_ref(parent); 599 hammer2_inode_unlock_ex(dip, parent); 600 hammer2_chain_wait(parent); 601 hammer2_chain_drop(parent); 602 goto retry; 603 } 604 hammer2_inode_unlock_ex(dip, parent); 605 606 if (error) { 607 KKASSERT(chain == NULL); 608 *errorp = error; 609 return (NULL); 610 } 611 612 /* 613 * Set up the new inode. 614 * 615 * NOTE: *_get() integrates chain's lock into the inode lock. 616 * 617 * NOTE: Only one new inode can currently be created per 618 * transaction. If the need arises we can adjust 619 * hammer2_trans_init() to allow more. 620 * 621 * NOTE: nipdata will have chain's blockset data. 622 */ 623 chain->data->ipdata.inum = trans->sync_tid; 624 nip = hammer2_inode_get(dip->pmp, dip, chain); 625 nipdata = &chain->data->ipdata; 626 627 if (vap) { 628 KKASSERT(trans->inodes_created == 0); 629 nipdata->type = hammer2_get_obj_type(vap->va_type); 630 nipdata->inum = trans->sync_tid; 631 ++trans->inodes_created; 632 } else { 633 nipdata->type = HAMMER2_OBJTYPE_DIRECTORY; 634 nipdata->inum = 1; 635 } 636 637 /* Inherit parent's inode compression mode. */ 638 nip->comp_heuristic = 0; 639 nipdata->comp_algo = dip_algo; 640 nipdata->version = HAMMER2_INODE_VERSION_ONE; 641 hammer2_update_time(&nipdata->ctime); 642 nipdata->mtime = nipdata->ctime; 643 if (vap) 644 nipdata->mode = vap->va_mode; 645 nipdata->nlinks = 1; 646 if (vap) { 647 if (dip) { 648 xuid = hammer2_to_unix_xid(&dip_uid); 649 xuid = vop_helper_create_uid(dip->pmp->mp, 650 dip_mode, 651 xuid, 652 cred, 653 &vap->va_mode); 654 } else { 655 xuid = 0; 656 } 657 if (vap->va_vaflags & VA_UID_UUID_VALID) 658 nipdata->uid = vap->va_uid_uuid; 659 else if (vap->va_uid != (uid_t)VNOVAL) 660 hammer2_guid_to_uuid(&nipdata->uid, vap->va_uid); 661 else 662 hammer2_guid_to_uuid(&nipdata->uid, xuid); 663 664 if (vap->va_vaflags & VA_GID_UUID_VALID) 665 nipdata->gid = vap->va_gid_uuid; 666 else if (vap->va_gid != (gid_t)VNOVAL) 667 hammer2_guid_to_uuid(&nipdata->gid, vap->va_gid); 668 else if (dip) 669 nipdata->gid = dip_gid; 670 } 671 672 /* 673 * Regular files and softlinks allow a small amount of data to be 674 * directly embedded in the inode. This flag will be cleared if 675 * the size is extended past the embedded limit. 676 */ 677 if (nipdata->type == HAMMER2_OBJTYPE_REGFILE || 678 nipdata->type == HAMMER2_OBJTYPE_SOFTLINK) { 679 nipdata->op_flags |= HAMMER2_OPFLAG_DIRECTDATA; 680 } 681 682 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 683 bcopy(name, nipdata->filename, name_len); 684 nipdata->name_key = lhc; 685 nipdata->name_len = name_len; 686 *chainp = chain; 687 688 return (nip); 689 } 690 691 /* 692 * chain may have been moved around by the create. 693 */ 694 static 695 void 696 hammer2_chain_refactor(hammer2_chain_t **chainp) 697 { 698 hammer2_chain_t *chain = *chainp; 699 hammer2_chain_core_t *core; 700 701 core = chain->core; 702 while (chain->flags & HAMMER2_CHAIN_DUPLICATED) { 703 spin_lock(&core->cst.spin); 704 chain = TAILQ_NEXT(chain, core_entry); 705 while (chain->flags & HAMMER2_CHAIN_DUPLICATED) 706 chain = TAILQ_NEXT(chain, core_entry); 707 hammer2_chain_ref(chain); 708 spin_unlock(&core->cst.spin); 709 KKASSERT(chain->core == core); 710 711 hammer2_chain_unlock(*chainp); 712 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS | 713 HAMMER2_RESOLVE_NOREF); /* eat ref */ 714 *chainp = chain; 715 } 716 } 717 718 /* 719 * ochain represents the target file inode. We need to move it to the 720 * specified common parent directory (dip) and rename it to a special 721 * invisible "0xINODENUMBER" filename. 722 * 723 * We use chain_duplicate and duplicate ochain at the new location, 724 * renaming it appropriately. We create a temporary chain and 725 * then delete it to placemark where the duplicate will go. Both of 726 * these use the inode number for (lhc) (the key), generating the 727 * invisible filename. 728 */ 729 static 730 hammer2_chain_t * 731 hammer2_hardlink_shiftup(hammer2_trans_t *trans, hammer2_chain_t **ochainp, 732 hammer2_inode_t *dip, int *errorp) 733 { 734 hammer2_inode_data_t *nipdata; 735 hammer2_chain_t *parent; 736 hammer2_chain_t *ochain; 737 hammer2_chain_t *nchain; 738 hammer2_chain_t *tmp; 739 hammer2_key_t key_dummy; 740 hammer2_key_t lhc; 741 hammer2_blockref_t bref; 742 int cache_index = -1; 743 744 ochain = *ochainp; 745 *errorp = 0; 746 lhc = ochain->data->ipdata.inum; 747 KKASSERT((lhc & HAMMER2_DIRHASH_VISIBLE) == 0); 748 749 /* 750 * Locate the inode or indirect block to create the new 751 * entry in. lhc represents the inode number so there is 752 * no collision iteration. 753 * 754 * There should be no key collisions with invisible inode keys. 755 * 756 * WARNING! Must use inode_lock_ex() on dip to handle a stale 757 * dip->chain cache. 758 */ 759 retry: 760 parent = hammer2_inode_lock_ex(dip); 761 /*parent = hammer2_chain_lookup_init(dip->chain, 0);*/ 762 nchain = hammer2_chain_lookup(&parent, &key_dummy, 763 lhc, lhc, &cache_index, 0); 764 if (nchain) { 765 kprintf("X3 chain %p parent %p dip %p dip->chain %p\n", 766 nchain, parent, dip, dip->chain); 767 hammer2_chain_unlock(nchain); 768 nchain = NULL; 769 *errorp = ENOSPC; 770 #if 1 771 Debugger("X3"); 772 #endif 773 } 774 775 /* 776 * Create entry in common parent directory using the seek position 777 * calculated above. 778 */ 779 if (*errorp == 0) { 780 KKASSERT(nchain == NULL); 781 *errorp = hammer2_chain_create(trans, &parent, &nchain, 782 lhc, 0, 783 HAMMER2_BREF_TYPE_INODE,/* n/a */ 784 HAMMER2_INODE_BYTES); /* n/a */ 785 hammer2_chain_refactor(&ochain); 786 *ochainp = ochain; 787 } 788 789 /* 790 * Cleanup and handle retries. 791 */ 792 if (*errorp == EAGAIN) { 793 hammer2_chain_ref(parent); 794 /* hammer2_chain_lookup_done(parent); */ 795 hammer2_inode_unlock_ex(dip, parent); 796 hammer2_chain_wait(parent); 797 hammer2_chain_drop(parent); 798 goto retry; 799 } 800 801 /* 802 * Handle the error case 803 */ 804 if (*errorp) { 805 KKASSERT(nchain == NULL); 806 hammer2_inode_unlock_ex(dip, parent); 807 /*hammer2_chain_lookup_done(parent);*/ 808 return (NULL); 809 } 810 811 /* 812 * Use chain as a placeholder for (lhc), delete it and replace 813 * it with our duplication. 814 * 815 * Gain a second lock on ochain for the duplication function to 816 * unlock, maintain the caller's original lock across the call. 817 * 818 * This is a bit messy. 819 */ 820 hammer2_chain_delete(trans, nchain, HAMMER2_DELETE_WILLDUP); 821 hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS); 822 tmp = ochain; 823 bref = tmp->bref; 824 bref.key = lhc; /* invisible dir entry key */ 825 bref.keybits = 0; 826 hammer2_chain_duplicate(trans, parent, &tmp, &bref); 827 hammer2_inode_unlock_ex(dip, parent); 828 /*hammer2_chain_lookup_done(parent);*/ 829 hammer2_chain_unlock(nchain); /* no longer needed */ 830 831 /* 832 * Now set chain to our duplicate and modify it appropriately. 833 * 834 * Directory entries are inodes but this is a hidden hardlink 835 * target. The name isn't used but to ease debugging give it 836 * a name after its inode number. 837 */ 838 nchain = tmp; 839 tmp = NULL; /* safety */ 840 841 hammer2_chain_modify(trans, &nchain, HAMMER2_MODIFY_ASSERTNOCOPY); 842 nipdata = &nchain->data->ipdata; 843 ksnprintf(nipdata->filename, sizeof(nipdata->filename), 844 "0x%016jx", (intmax_t)nipdata->inum); 845 nipdata->name_len = strlen(nipdata->filename); 846 nipdata->name_key = lhc; 847 848 return (nchain); 849 } 850 851 /* 852 * Connect the target inode represented by (*chainp) to the media topology 853 * at (dip, name, len). 854 * 855 * If hlink is TRUE this function creates an OBJTYPE_HARDLINK directory 856 * entry instead of connecting (*chainp). 857 * 858 * If hlink is FALSE this function uses chain_duplicate() to make a copy 859 * if (*chainp) in the directory entry. (*chainp) is likely to be deleted 860 * by the caller in this case (e.g. rename). 861 */ 862 int 863 hammer2_inode_connect(hammer2_trans_t *trans, int hlink, 864 hammer2_inode_t *dip, hammer2_chain_t **chainp, 865 const uint8_t *name, size_t name_len) 866 { 867 hammer2_inode_data_t *ipdata; 868 hammer2_chain_t *nchain; 869 hammer2_chain_t *parent; 870 hammer2_chain_t *ochain; 871 hammer2_key_t key_dummy; 872 hammer2_key_t lhc; 873 int cache_index = -1; 874 int error; 875 876 ochain = *chainp; 877 878 /* 879 * Since ochain is either disconnected from the topology or represents 880 * a hardlink terminus which is always a parent of or equal to dip, 881 * we should be able to safely lock dip->chain for our setup. 882 * 883 * WARNING! Must use inode_lock_ex() on dip to handle a stale 884 * dip->chain cache. 885 */ 886 parent = hammer2_inode_lock_ex(dip); 887 /*parent = hammer2_chain_lookup_init(dip->chain, 0);*/ 888 889 lhc = hammer2_dirhash(name, name_len); 890 891 /* 892 * Locate the inode or indirect block to create the new 893 * entry in. At the same time check for key collisions 894 * and iterate until we don't get one. 895 */ 896 error = 0; 897 while (error == 0) { 898 nchain = hammer2_chain_lookup(&parent, &key_dummy, 899 lhc, lhc, &cache_index, 0); 900 if (nchain == NULL) 901 break; 902 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK) 903 error = ENOSPC; 904 hammer2_chain_unlock(nchain); 905 nchain = NULL; 906 ++lhc; 907 } 908 909 if (error == 0) { 910 if (hlink) { 911 /* 912 * Hardlink pointer needed, create totally fresh 913 * directory entry. 914 */ 915 KKASSERT(nchain == NULL); 916 error = hammer2_chain_create(trans, &parent, &nchain, 917 lhc, 0, 918 HAMMER2_BREF_TYPE_INODE, 919 HAMMER2_INODE_BYTES); 920 hammer2_chain_refactor(&ochain); 921 } else { 922 /* 923 * Reconnect the original chain and rename. Use 924 * chain_duplicate(). The caller will likely delete 925 * or has already deleted the original chain in 926 * this case. 927 * 928 * NOTE: chain_duplicate() generates a new chain 929 * with CHAIN_DELETED cleared (ochain typically 930 * has it set from the file unlink). 931 */ 932 nchain = ochain; 933 ochain = NULL; 934 hammer2_chain_duplicate(trans, NULL, &nchain, NULL); 935 error = hammer2_chain_create(trans, &parent, &nchain, 936 lhc, 0, 937 HAMMER2_BREF_TYPE_INODE, 938 HAMMER2_INODE_BYTES); 939 } 940 } 941 942 /* 943 * Unlock stuff. 944 */ 945 KKASSERT(error != EAGAIN); 946 hammer2_inode_unlock_ex(dip, parent); 947 /*hammer2_chain_lookup_done(parent);*/ 948 parent = NULL; 949 950 /* 951 * nchain should be NULL on error, leave ochain (== *chainp) alone. 952 */ 953 if (error) { 954 KKASSERT(nchain == NULL); 955 return (error); 956 } 957 958 /* 959 * Directory entries are inodes so if the name has changed we have 960 * to update the inode. 961 * 962 * When creating an OBJTYPE_HARDLINK entry remember to unlock the 963 * chain, the caller will access the hardlink via the actual hardlink 964 * target file and not the hardlink pointer entry, so we must still 965 * return ochain. 966 */ 967 if (hlink && hammer2_hardlink_enable >= 0) { 968 /* 969 * Create the HARDLINK pointer. oip represents the hardlink 970 * target in this situation. 971 * 972 * We will return ochain (the hardlink target). 973 */ 974 hammer2_chain_modify(trans, &nchain, 975 HAMMER2_MODIFY_ASSERTNOCOPY); 976 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 977 ipdata = &nchain->data->ipdata; 978 bcopy(name, ipdata->filename, name_len); 979 ipdata->name_key = lhc; 980 ipdata->name_len = name_len; 981 ipdata->target_type = ochain->data->ipdata.type; 982 ipdata->type = HAMMER2_OBJTYPE_HARDLINK; 983 ipdata->inum = ochain->data->ipdata.inum; 984 ipdata->nlinks = 1; 985 hammer2_chain_unlock(nchain); 986 nchain = ochain; 987 ochain = NULL; 988 } else if (hlink && hammer2_hardlink_enable < 0) { 989 /* 990 * Create a snapshot (hardlink fake mode for debugging). 991 * (ochain already flushed above so we can just copy the 992 * bref XXX). 993 * 994 * Since this is a snapshot we return nchain in the fake 995 * hardlink case. 996 */ 997 hammer2_chain_modify(trans, &nchain, 998 HAMMER2_MODIFY_ASSERTNOCOPY); 999 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 1000 ipdata = &nchain->data->ipdata; 1001 *ipdata = ochain->data->ipdata; 1002 bcopy(name, ipdata->filename, name_len); 1003 ipdata->name_key = lhc; 1004 ipdata->name_len = name_len; 1005 kprintf("created fake hardlink %*.*s\n", 1006 (int)name_len, (int)name_len, name); 1007 } else { 1008 /* 1009 * nchain is a duplicate of ochain at the new location. 1010 * We must fixup the name stored in oip. The bref key 1011 * has already been set up. 1012 */ 1013 hammer2_chain_modify(trans, &nchain, 1014 HAMMER2_MODIFY_ASSERTNOCOPY); 1015 ipdata = &nchain->data->ipdata; 1016 1017 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 1018 bcopy(name, ipdata->filename, name_len); 1019 ipdata->name_key = lhc; 1020 ipdata->name_len = name_len; 1021 ipdata->nlinks = 1; 1022 } 1023 1024 /* 1025 * We are replacing ochain with nchain, unlock ochain. In the 1026 * case where ochain is left unchanged the code above sets 1027 * nchain to ochain and ochain to NULL, resulting in a NOP here. 1028 */ 1029 if (ochain) 1030 hammer2_chain_unlock(ochain); 1031 *chainp = nchain; 1032 1033 return (0); 1034 } 1035 1036 /* 1037 * Repoint ip->chain to nchain. Caller must hold the inode exclusively 1038 * locked. 1039 * 1040 * ip->chain is set to nchain. The prior chain in ip->chain is dropped 1041 * and nchain is ref'd. 1042 */ 1043 void 1044 hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip, 1045 hammer2_chain_t *nchain) 1046 { 1047 hammer2_chain_t *ochain; 1048 hammer2_inode_t *opip; 1049 1050 /* 1051 * Repoint ip->chain if requested. 1052 */ 1053 ochain = ip->chain; 1054 ip->chain = nchain; 1055 if (nchain) 1056 hammer2_chain_ref(nchain); 1057 if (ochain) 1058 hammer2_chain_drop(ochain); 1059 1060 /* 1061 * Repoint ip->pip if requested (non-NULL pip). 1062 */ 1063 if (pip && ip->pip != pip) { 1064 opip = ip->pip; 1065 hammer2_inode_ref(pip); 1066 ip->pip = pip; 1067 if (opip) 1068 hammer2_inode_drop(opip); 1069 } 1070 } 1071 1072 /* 1073 * Unlink the file from the specified directory inode. The directory inode 1074 * does not need to be locked. 1075 * 1076 * isdir determines whether a directory/non-directory check should be made. 1077 * No check is made if isdir is set to -1. 1078 * 1079 * NOTE! The underlying file can still be active with open descriptors 1080 * or if the chain is being manually held (e.g. for rename). 1081 * 1082 * The caller is responsible for fixing up ip->chain if e.g. a 1083 * rename occurs (see chain_duplicate()). 1084 */ 1085 int 1086 hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip, 1087 const uint8_t *name, size_t name_len, 1088 int isdir, int *hlinkp) 1089 { 1090 hammer2_inode_data_t *ipdata; 1091 hammer2_chain_t *parent; 1092 hammer2_chain_t *ochain; 1093 hammer2_chain_t *chain; 1094 hammer2_chain_t *dparent; 1095 hammer2_chain_t *dchain; 1096 hammer2_key_t key_dummy; 1097 hammer2_key_t key_next; 1098 hammer2_key_t lhc; 1099 int error; 1100 int cache_index = -1; 1101 uint8_t type; 1102 1103 error = 0; 1104 ochain = NULL; 1105 lhc = hammer2_dirhash(name, name_len); 1106 1107 /* 1108 * Search for the filename in the directory 1109 */ 1110 if (hlinkp) 1111 *hlinkp = 0; 1112 parent = hammer2_inode_lock_ex(dip); 1113 chain = hammer2_chain_lookup(&parent, &key_next, 1114 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1115 &cache_index, 0); 1116 while (chain) { 1117 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1118 name_len == chain->data->ipdata.name_len && 1119 bcmp(name, chain->data->ipdata.filename, name_len) == 0) { 1120 break; 1121 } 1122 chain = hammer2_chain_next(&parent, chain, &key_next, 1123 key_next, 1124 lhc + HAMMER2_DIRHASH_LOMASK, 1125 &cache_index, 0); 1126 } 1127 hammer2_inode_unlock_ex(dip, NULL); /* retain parent */ 1128 1129 /* 1130 * Not found or wrong type (isdir < 0 disables the type check). 1131 * If a hardlink pointer, type checks use the hardlink target. 1132 */ 1133 if (chain == NULL) { 1134 error = ENOENT; 1135 goto done; 1136 } 1137 if ((type = chain->data->ipdata.type) == HAMMER2_OBJTYPE_HARDLINK) { 1138 if (hlinkp) 1139 *hlinkp = 1; 1140 type = chain->data->ipdata.target_type; 1141 } 1142 1143 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 0) { 1144 error = ENOTDIR; 1145 goto done; 1146 } 1147 if (type != HAMMER2_OBJTYPE_DIRECTORY && isdir >= 1) { 1148 error = EISDIR; 1149 goto done; 1150 } 1151 1152 /* 1153 * Hardlink must be resolved. We can't hold parent locked while we 1154 * do this or we could deadlock. 1155 * 1156 * On success chain will be adjusted to point at the hardlink target 1157 * and ochain will point to the hardlink pointer in the original 1158 * directory. Otherwise chain remains pointing to the original. 1159 */ 1160 if (chain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) { 1161 hammer2_chain_unlock(parent); 1162 parent = NULL; 1163 error = hammer2_hardlink_find(dip, &chain, &ochain); 1164 } 1165 1166 /* 1167 * If this is a directory the directory must be empty. However, if 1168 * isdir < 0 we are doing a rename and the directory does not have 1169 * to be empty, and if isdir > 1 we are deleting a PFS/snapshot 1170 * and the directory does not have to be empty. 1171 * 1172 * NOTE: We check the full key range here which covers both visible 1173 * and invisible entries. Theoretically there should be no 1174 * invisible (hardlink target) entries if there are no visible 1175 * entries. 1176 */ 1177 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 1) { 1178 dparent = hammer2_chain_lookup_init(chain, 0); 1179 dchain = hammer2_chain_lookup(&dparent, &key_dummy, 1180 0, (hammer2_key_t)-1, 1181 &cache_index, 1182 HAMMER2_LOOKUP_NODATA); 1183 if (dchain) { 1184 hammer2_chain_unlock(dchain); 1185 hammer2_chain_lookup_done(dparent); 1186 error = ENOTEMPTY; 1187 goto done; 1188 } 1189 hammer2_chain_lookup_done(dparent); 1190 dparent = NULL; 1191 /* dchain NULL */ 1192 } 1193 1194 /* 1195 * Ok, we can now unlink the chain. We always decrement nlinks even 1196 * if the entry can be deleted in case someone has the file open and 1197 * does an fstat(). 1198 * 1199 * The chain itself will no longer be in the on-media topology but 1200 * can still be flushed to the media (e.g. if an open descriptor 1201 * remains). When the last vnode/ip ref goes away the chain will 1202 * be marked unmodified, avoiding any further (now unnecesary) I/O. 1203 * 1204 * A non-NULL ochain indicates a hardlink. 1205 */ 1206 if (ochain) { 1207 /* 1208 * Delete the original hardlink pointer. 1209 * 1210 * NOTE: parent from above is NULL when ochain != NULL 1211 * so we can reuse it. 1212 */ 1213 hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS); 1214 hammer2_chain_delete(trans, ochain, 0); 1215 hammer2_chain_unlock(ochain); 1216 1217 /* 1218 * Then decrement nlinks on hardlink target, deleting 1219 * the target when nlinks drops to 0. 1220 */ 1221 hammer2_chain_modify(trans, &chain, 0); 1222 --chain->data->ipdata.nlinks; 1223 if (chain->data->ipdata.nlinks == 0) 1224 hammer2_chain_delete(trans, chain, 0); 1225 } else { 1226 /* 1227 * Otherwise this was not a hardlink and we can just 1228 * remove the entry and decrement nlinks. 1229 * 1230 * NOTE: *_get() integrates chain's lock into the inode lock. 1231 */ 1232 hammer2_chain_modify(trans, &chain, 0); 1233 ipdata = &chain->data->ipdata; 1234 --ipdata->nlinks; 1235 hammer2_chain_delete(trans, chain, 0); 1236 } 1237 1238 error = 0; 1239 done: 1240 if (chain) 1241 hammer2_chain_unlock(chain); 1242 if (parent) 1243 hammer2_chain_lookup_done(parent); 1244 if (ochain) 1245 hammer2_chain_drop(ochain); 1246 1247 return error; 1248 } 1249 1250 /* 1251 * Given an exclusively locked inode we consolidate its chain for hardlink 1252 * creation, adding (nlinks) to the file's link count and potentially 1253 * relocating the inode to a directory common to ip->pip and tdip. 1254 * 1255 * Replaces (*chainp) if consolidation occurred, unlocking the old chain 1256 * and returning a new locked chain. 1257 * 1258 * NOTE! This function will also replace ip->chain. 1259 */ 1260 int 1261 hammer2_hardlink_consolidate(hammer2_trans_t *trans, hammer2_inode_t *ip, 1262 hammer2_chain_t **chainp, 1263 hammer2_inode_t *tdip, int nlinks) 1264 { 1265 hammer2_inode_data_t *ipdata; 1266 hammer2_inode_t *fdip; 1267 hammer2_inode_t *cdip; 1268 hammer2_chain_t *chain; 1269 hammer2_chain_t *nchain; 1270 int error; 1271 1272 chain = *chainp; 1273 if (nlinks == 0 && /* no hardlink needed */ 1274 (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE)) { 1275 return (0); 1276 } 1277 if (hammer2_hardlink_enable < 0) { /* fake hardlinks */ 1278 return (0); 1279 } 1280 1281 if (hammer2_hardlink_enable == 0) { /* disallow hardlinks */ 1282 hammer2_chain_unlock(chain); 1283 *chainp = NULL; 1284 return (ENOTSUP); 1285 } 1286 1287 /* 1288 * cdip will be returned with a ref, but not locked. 1289 */ 1290 fdip = ip->pip; 1291 cdip = hammer2_inode_common_parent(fdip, tdip); 1292 1293 /* 1294 * If no change in the hardlink's target directory is required and 1295 * this is already a hardlink target, all we need to do is adjust 1296 * the link count. 1297 * 1298 * XXX The common parent is a big wiggly due to duplication from 1299 * renames. Compare the core (RBTREE) pointer instead of the 1300 * ip's. 1301 */ 1302 if (cdip == fdip && 1303 (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE) == 0) { 1304 if (nlinks) { 1305 hammer2_chain_modify(trans, &chain, 0); 1306 chain->data->ipdata.nlinks += nlinks; 1307 } 1308 error = 0; 1309 goto done; 1310 } 1311 1312 /* 1313 * We either have to move an existing hardlink target or we have 1314 * to create a fresh hardlink target. 1315 * 1316 * Hardlink targets are hidden inodes in a parent directory common 1317 * to all directory entries referencing the hardlink. 1318 */ 1319 nchain = hammer2_hardlink_shiftup(trans, &chain, cdip, &error); 1320 1321 if (error == 0) { 1322 /* 1323 * Bump nlinks on duplicated hidden inode, repoint 1324 * ip->chain. 1325 */ 1326 hammer2_chain_modify(trans, &nchain, 0); 1327 nchain->data->ipdata.nlinks += nlinks; 1328 hammer2_inode_repoint(ip, cdip, nchain); 1329 1330 /* 1331 * If the old chain is not a hardlink target then replace 1332 * it with a OBJTYPE_HARDLINK pointer. 1333 * 1334 * If the old chain IS a hardlink target then delete it. 1335 */ 1336 if (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE) { 1337 /* 1338 * Replace original non-hardlink that's been dup'd 1339 * with a special hardlink directory entry. We must 1340 * set the DIRECTDATA flag to prevent sub-chains 1341 * from trying to synchronize to the inode if the 1342 * file is extended afterwords. 1343 * 1344 * DELDUP_RECORE causes the new chain to NOT inherit 1345 * the old chain's core (sub-tree). 1346 */ 1347 /*hammer2_chain_modify(trans, &chain, 0);*/ 1348 hammer2_chain_delete_duplicate(trans, &chain, 1349 HAMMER2_DELDUP_RECORE); 1350 hammer2_chain_modify(trans, &chain, 0); 1351 ipdata = &chain->data->ipdata; 1352 ipdata->target_type = ipdata->type; 1353 ipdata->type = HAMMER2_OBJTYPE_HARDLINK; 1354 ipdata->uflags = 0; 1355 ipdata->rmajor = 0; 1356 ipdata->rminor = 0; 1357 ipdata->ctime = 0; 1358 ipdata->mtime = 0; 1359 ipdata->atime = 0; 1360 ipdata->btime = 0; 1361 bzero(&ipdata->uid, sizeof(ipdata->uid)); 1362 bzero(&ipdata->gid, sizeof(ipdata->gid)); 1363 ipdata->op_flags = HAMMER2_OPFLAG_DIRECTDATA; 1364 ipdata->cap_flags = 0; 1365 ipdata->mode = 0; 1366 ipdata->size = 0; 1367 ipdata->nlinks = 1; 1368 ipdata->iparent = 0; /* XXX */ 1369 ipdata->pfs_type = 0; 1370 ipdata->pfs_inum = 0; 1371 bzero(&ipdata->pfs_clid, sizeof(ipdata->pfs_clid)); 1372 bzero(&ipdata->pfs_fsid, sizeof(ipdata->pfs_fsid)); 1373 ipdata->data_quota = 0; 1374 ipdata->data_count = 0; 1375 ipdata->inode_quota = 0; 1376 ipdata->inode_count = 0; 1377 ipdata->attr_tid = 0; 1378 ipdata->dirent_tid = 0; 1379 bzero(&ipdata->u, sizeof(ipdata->u)); 1380 /* XXX transaction ids */ 1381 } else { 1382 hammer2_chain_delete(trans, chain, 0); 1383 } 1384 1385 /* 1386 * Return the new chain. 1387 */ 1388 hammer2_chain_unlock(chain); 1389 chain = nchain; 1390 } else { 1391 /* 1392 * Return an error 1393 */ 1394 hammer2_chain_unlock(chain); 1395 chain = NULL; 1396 } 1397 1398 /* 1399 * Cleanup, chain/nchain already dealt with. 1400 */ 1401 done: 1402 *chainp = chain; 1403 hammer2_inode_drop(cdip); 1404 1405 return (error); 1406 } 1407 1408 /* 1409 * If (*ochainp) is non-NULL it points to the forward OBJTYPE_HARDLINK 1410 * inode while (*chainp) points to the resolved (hidden hardlink 1411 * target) inode. In this situation when nlinks is 1 we wish to 1412 * deconsolidate the hardlink, moving it back to the directory that now 1413 * represents the only remaining link. 1414 */ 1415 int 1416 hammer2_hardlink_deconsolidate(hammer2_trans_t *trans, 1417 hammer2_inode_t *dip, 1418 hammer2_chain_t **chainp, 1419 hammer2_chain_t **ochainp) 1420 { 1421 if (*ochainp == NULL) 1422 return (0); 1423 /* XXX */ 1424 return (0); 1425 } 1426 1427 /* 1428 * The caller presents a locked *chainp pointing to a HAMMER2_BREF_TYPE_INODE 1429 * with an obj_type of HAMMER2_OBJTYPE_HARDLINK. This routine will gobble 1430 * the *chainp and return a new locked *chainp representing the file target 1431 * (the original *chainp will be unlocked). 1432 * 1433 * When a match is found the chain representing the original HARDLINK 1434 * will be returned in *ochainp with a ref, but not locked. 1435 * 1436 * When no match is found *chainp is set to NULL and EIO is returned. 1437 * (*ochainp) will still be set to the original chain with a ref but not 1438 * locked. 1439 */ 1440 int 1441 hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_chain_t **chainp, 1442 hammer2_chain_t **ochainp) 1443 { 1444 hammer2_chain_t *chain = *chainp; 1445 hammer2_chain_t *parent; 1446 hammer2_inode_t *ip; 1447 hammer2_inode_t *pip; 1448 hammer2_key_t key_dummy; 1449 hammer2_key_t lhc; 1450 int cache_index = -1; 1451 1452 pip = dip; 1453 hammer2_inode_ref(pip); /* for loop */ 1454 hammer2_chain_ref(chain); /* for (*ochainp) */ 1455 *ochainp = chain; 1456 1457 /* 1458 * Locate the hardlink. pip is referenced and not locked, 1459 * ipp. 1460 * 1461 * chain is reused. 1462 */ 1463 lhc = chain->data->ipdata.inum; 1464 hammer2_chain_unlock(chain); 1465 chain = NULL; 1466 1467 while ((ip = pip) != NULL) { 1468 parent = hammer2_inode_lock_ex(ip); 1469 hammer2_inode_drop(ip); /* loop */ 1470 KKASSERT(parent->bref.type == HAMMER2_BREF_TYPE_INODE); 1471 chain = hammer2_chain_lookup(&parent, &key_dummy, 1472 lhc, lhc, &cache_index, 0); 1473 hammer2_chain_lookup_done(parent); /* discard parent */ 1474 if (chain) 1475 break; 1476 pip = ip->pip; /* safe, ip held locked */ 1477 if (pip) 1478 hammer2_inode_ref(pip); /* loop */ 1479 hammer2_inode_unlock_ex(ip, NULL); 1480 } 1481 1482 /* 1483 * chain is locked, ip is locked. Unlock ip, return the locked 1484 * chain. *ipp is already set w/a ref count and not locked. 1485 * 1486 * (parent is already unlocked). 1487 */ 1488 if (ip) 1489 hammer2_inode_unlock_ex(ip, NULL); 1490 *chainp = chain; 1491 if (chain) { 1492 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_INODE); 1493 /* already locked */ 1494 return (0); 1495 } else { 1496 return (EIO); 1497 } 1498 } 1499 1500 /* 1501 * Find the directory common to both fdip and tdip, hold and return 1502 * its inode. 1503 */ 1504 hammer2_inode_t * 1505 hammer2_inode_common_parent(hammer2_inode_t *fdip, hammer2_inode_t *tdip) 1506 { 1507 hammer2_inode_t *scan1; 1508 hammer2_inode_t *scan2; 1509 1510 /* 1511 * We used to have a depth field but it complicated matters too 1512 * much for directory renames. So now its ugly. Check for 1513 * simple cases before giving up and doing it the expensive way. 1514 * 1515 * XXX need a bottom-up topology stability lock 1516 */ 1517 if (fdip == tdip || fdip == tdip->pip) { 1518 hammer2_inode_ref(fdip); 1519 return(fdip); 1520 } 1521 if (fdip->pip == tdip) { 1522 hammer2_inode_ref(tdip); 1523 return(tdip); 1524 } 1525 1526 /* 1527 * XXX not MPSAFE 1528 */ 1529 for (scan1 = fdip; scan1->pmp == fdip->pmp; scan1 = scan1->pip) { 1530 scan2 = tdip; 1531 while (scan2->pmp == tdip->pmp) { 1532 if (scan1 == scan2) { 1533 hammer2_inode_ref(scan1); 1534 return(scan1); 1535 } 1536 scan2 = scan2->pip; 1537 if (scan2 == NULL) 1538 break; 1539 } 1540 } 1541 panic("hammer2_inode_common_parent: no common parent %p %p\n", 1542 fdip, tdip); 1543 /* NOT REACHED */ 1544 return(NULL); 1545 } 1546 1547 /* 1548 * Synchronize the inode's frontend state with the chain state prior 1549 * to any explicit flush of the inode or any strategy write call. 1550 * 1551 * Called with a locked inode. 1552 */ 1553 void 1554 hammer2_inode_fsync(hammer2_trans_t *trans, hammer2_inode_t *ip, 1555 hammer2_chain_t **chainp) 1556 { 1557 hammer2_inode_data_t *ipdata; 1558 hammer2_chain_t *parent; 1559 hammer2_chain_t *chain; 1560 hammer2_key_t lbase; 1561 hammer2_key_t key_next; 1562 int cache_index; 1563 1564 ipdata = &ip->chain->data->ipdata; 1565 1566 if (ip->flags & HAMMER2_INODE_MTIME) { 1567 ipdata = hammer2_chain_modify_ip(trans, ip, chainp, 0); 1568 atomic_clear_int(&ip->flags, HAMMER2_INODE_MTIME); 1569 ipdata->mtime = ip->mtime; 1570 } 1571 if ((ip->flags & HAMMER2_INODE_RESIZED) && ip->size < ipdata->size) { 1572 ipdata = hammer2_chain_modify_ip(trans, ip, chainp, 0); 1573 ipdata->size = ip->size; 1574 atomic_clear_int(&ip->flags, HAMMER2_INODE_RESIZED); 1575 1576 /* 1577 * We must delete any chains beyond the EOF. The chain 1578 * straddling the EOF will be pending in the bioq. 1579 */ 1580 lbase = (ipdata->size + HAMMER2_PBUFMASK64) & 1581 ~HAMMER2_PBUFMASK64; 1582 parent = hammer2_chain_lookup_init(ip->chain, 0); 1583 chain = hammer2_chain_lookup(&parent, &key_next, 1584 lbase, (hammer2_key_t)-1, 1585 &cache_index, 1586 HAMMER2_LOOKUP_NODATA); 1587 while (chain) { 1588 /* 1589 * Degenerate embedded case, nothing to loop on 1590 */ 1591 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 1592 hammer2_chain_unlock(chain); 1593 break; 1594 } 1595 if (chain->bref.type == HAMMER2_BREF_TYPE_DATA) { 1596 hammer2_chain_delete(trans, chain, 0); 1597 } 1598 chain = hammer2_chain_next(&parent, chain, &key_next, 1599 key_next, (hammer2_key_t)-1, 1600 &cache_index, 1601 HAMMER2_LOOKUP_NODATA); 1602 } 1603 hammer2_chain_lookup_done(parent); 1604 } else 1605 if ((ip->flags & HAMMER2_INODE_RESIZED) && ip->size > ipdata->size) { 1606 ipdata = hammer2_chain_modify_ip(trans, ip, chainp, 0); 1607 ipdata->size = ip->size; 1608 atomic_clear_int(&ip->flags, HAMMER2_INODE_RESIZED); 1609 1610 /* 1611 * When resizing larger we may not have any direct-data 1612 * available. 1613 */ 1614 if ((ipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) && 1615 ip->size > HAMMER2_EMBEDDED_BYTES) { 1616 ipdata->op_flags &= ~HAMMER2_OPFLAG_DIRECTDATA; 1617 bzero(&ipdata->u.blockset, sizeof(ipdata->u.blockset)); 1618 } 1619 } 1620 } 1621