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 hammer2_inode_t * 58 hammer2_inode_lookup(hammer2_pfsmount_t *pmp, hammer2_tid_t inum) 59 { 60 hammer2_inode_t *ip; 61 62 if (pmp) { 63 spin_lock(&pmp->inum_spin); 64 ip = RB_LOOKUP(hammer2_inode_tree, &pmp->inum_tree, inum); 65 if (ip) 66 hammer2_inode_ref(ip); 67 spin_unlock(&pmp->inum_spin); 68 } else { 69 ip = NULL; 70 } 71 return(ip); 72 } 73 74 /* 75 * Adding a ref to an inode is only legal if the inode already has at least 76 * one ref. 77 */ 78 void 79 hammer2_inode_ref(hammer2_inode_t *ip) 80 { 81 atomic_add_int(&ip->refs, 1); 82 } 83 84 /* 85 * Drop an inode reference, freeing the inode when the last reference goes 86 * away. 87 */ 88 void 89 hammer2_inode_drop(hammer2_inode_t *ip) 90 { 91 hammer2_mount_t *hmp; 92 hammer2_inode_t *pip; 93 hammer2_chain_t *chain; 94 u_int refs; 95 96 while (ip) { 97 refs = ip->refs; 98 cpu_ccfence(); 99 if (refs == 1) { 100 /* 101 * Transition to zero, must interlock with 102 * the inode inumber lookup tree (if applicable). 103 * 104 * NOTE: The super-root inode has no pmp. 105 */ 106 if (ip->pmp) 107 spin_lock(&ip->pmp->inum_spin); 108 109 if (atomic_cmpset_int(&ip->refs, 1, 0)) { 110 KKASSERT(ip->topo_cst.count == 0); 111 if (ip->flags & HAMMER2_INODE_ONRBTREE) { 112 atomic_clear_int(&ip->flags, 113 HAMMER2_INODE_ONRBTREE); 114 RB_REMOVE(hammer2_inode_tree, 115 &ip->pmp->inum_tree, 116 ip); 117 } 118 if (ip->pmp) 119 spin_unlock(&ip->pmp->inum_spin); 120 121 hmp = ip->hmp; 122 ip->hmp = NULL; 123 pip = ip->pip; 124 ip->pip = NULL; 125 chain = ip->chain; 126 ip->chain = NULL; 127 if (chain) 128 hammer2_chain_drop(chain); 129 130 /* 131 * We have to drop pip (if non-NULL) to 132 * dispose of our implied reference from 133 * ip->pip. We can simply loop on it. 134 */ 135 kfree(ip, hmp->minode); 136 ip = pip; 137 /* continue with pip (can be NULL) */ 138 } else { 139 if (ip->pmp) 140 spin_unlock(&ip->pmp->inum_spin); 141 } 142 } else { 143 /* 144 * Non zero transition 145 */ 146 if (atomic_cmpset_int(&ip->refs, refs, refs - 1)) 147 break; 148 } 149 } 150 } 151 152 /* 153 * Get the vnode associated with the given inode, allocating the vnode if 154 * necessary. The vnode will be returned exclusively locked. 155 * 156 * The caller must lock the inode (shared or exclusive). 157 * 158 * Great care must be taken to avoid deadlocks and vnode acquisition/reclaim 159 * races. 160 */ 161 struct vnode * 162 hammer2_igetv(hammer2_inode_t *ip, int *errorp) 163 { 164 hammer2_inode_data_t *ipdata; 165 hammer2_pfsmount_t *pmp; 166 struct vnode *vp; 167 ccms_state_t ostate; 168 169 pmp = ip->pmp; 170 KKASSERT(pmp != NULL); 171 *errorp = 0; 172 ipdata = &ip->chain->data->ipdata; 173 174 for (;;) { 175 /* 176 * Attempt to reuse an existing vnode assignment. It is 177 * possible to race a reclaim so the vget() may fail. The 178 * inode must be unlocked during the vget() to avoid a 179 * deadlock against a reclaim. 180 */ 181 vp = ip->vp; 182 if (vp) { 183 /* 184 * Inode must be unlocked during the vget() to avoid 185 * possible deadlocks, but leave the ip ref intact. 186 * 187 * vnode is held to prevent destruction during the 188 * vget(). The vget() can still fail if we lost 189 * a reclaim race on the vnode. 190 */ 191 vhold_interlocked(vp); 192 ostate = hammer2_inode_lock_temp_release(ip); 193 if (vget(vp, LK_EXCLUSIVE)) { 194 vdrop(vp); 195 hammer2_inode_lock_temp_restore(ip, ostate); 196 continue; 197 } 198 hammer2_inode_lock_temp_restore(ip, ostate); 199 vdrop(vp); 200 /* vp still locked and ref from vget */ 201 if (ip->vp != vp) { 202 kprintf("hammer2: igetv race %p/%p\n", 203 ip->vp, vp); 204 vput(vp); 205 continue; 206 } 207 *errorp = 0; 208 break; 209 } 210 211 /* 212 * No vnode exists, allocate a new vnode. Beware of 213 * allocation races. This function will return an 214 * exclusively locked and referenced vnode. 215 */ 216 *errorp = getnewvnode(VT_HAMMER2, pmp->mp, &vp, 0, 0); 217 if (*errorp) { 218 kprintf("hammer2: igetv getnewvnode failed %d\n", 219 *errorp); 220 vp = NULL; 221 break; 222 } 223 224 /* 225 * Lock the inode and check for an allocation race. 226 */ 227 ostate = hammer2_inode_lock_upgrade(ip); 228 if (ip->vp != NULL) { 229 vp->v_type = VBAD; 230 vx_put(vp); 231 hammer2_inode_lock_downgrade(ip, ostate); 232 continue; 233 } 234 235 switch (ipdata->type) { 236 case HAMMER2_OBJTYPE_DIRECTORY: 237 vp->v_type = VDIR; 238 break; 239 case HAMMER2_OBJTYPE_REGFILE: 240 vp->v_type = VREG; 241 vinitvmio(vp, ipdata->size, 242 HAMMER2_LBUFSIZE, 243 (int)ipdata->size & HAMMER2_LBUFMASK); 244 break; 245 case HAMMER2_OBJTYPE_SOFTLINK: 246 /* 247 * XXX for now we are using the generic file_read 248 * and file_write code so we need a buffer cache 249 * association. 250 */ 251 vp->v_type = VLNK; 252 vinitvmio(vp, ipdata->size, 253 HAMMER2_LBUFSIZE, 254 (int)ipdata->size & HAMMER2_LBUFMASK); 255 break; 256 /* XXX FIFO */ 257 default: 258 panic("hammer2: unhandled objtype %d", ipdata->type); 259 break; 260 } 261 262 if (ip == pmp->iroot) 263 vsetflags(vp, VROOT); 264 265 vp->v_data = ip; 266 ip->vp = vp; 267 hammer2_inode_ref(ip); /* vp association */ 268 hammer2_inode_lock_downgrade(ip, ostate); 269 break; 270 } 271 272 /* 273 * Return non-NULL vp and *errorp == 0, or NULL vp and *errorp != 0. 274 */ 275 if (hammer2_debug & 0x0002) { 276 kprintf("igetv vp %p refs %d aux %d\n", 277 vp, vp->v_sysref.refcnt, vp->v_auxrefs); 278 } 279 return (vp); 280 } 281 282 /* 283 * The passed-in chain must be locked and the returned inode will also be 284 * locked. A ref is added to both the chain and the inode. The chain lock 285 * is inherited by the inode structure and should not be separately released. 286 * 287 * The hammer2_inode structure regulates the interface between the high level 288 * kernel VNOPS API and the filesystem backend (the chains). 289 * 290 * WARNING! This routine sucks up the chain's lock (makes it part of the 291 * inode lock from the point of view of the inode lock API), 292 * so callers need to be careful. 293 * 294 * WARNING! The mount code is allowed to pass dip == NULL for iroot and 295 * is allowed to pass pmp == NULL and dip == NULL for sroot. 296 */ 297 hammer2_inode_t * 298 hammer2_inode_get(hammer2_mount_t *hmp, hammer2_pfsmount_t *pmp, 299 hammer2_inode_t *dip, hammer2_chain_t *chain) 300 { 301 hammer2_inode_t *nip; 302 hammer2_chain_t *ochain; 303 304 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_INODE); 305 306 /* 307 * Interlocked lookup/ref of the inode. This code is only needed 308 * when looking up inodes with nlinks != 0 (TODO: optimize out 309 * otherwise and test for duplicates). 310 */ 311 again: 312 for (;;) { 313 nip = hammer2_inode_lookup(pmp, chain->data->ipdata.inum); 314 if (nip == NULL) 315 break; 316 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE); 317 if ((nip->flags & HAMMER2_INODE_ONRBTREE) == 0) { 318 ccms_thread_unlock(&nip->topo_cst); 319 hammer2_inode_drop(nip); 320 continue; 321 } 322 if (nip->chain != chain) { 323 hammer2_chain_ref(chain); /* new nip->chain */ 324 ochain = nip->chain; 325 nip->chain = chain; /* fully locked */ 326 hammer2_chain_drop(ochain); /* old nip->chain */ 327 } 328 /* 329 * Consolidated nip/nip->chain is locked (chain locked 330 * by caller). 331 */ 332 return nip; 333 } 334 335 /* 336 * We couldn't find the inode number, create a new inode. 337 */ 338 nip = kmalloc(sizeof(*nip), hmp->minode, M_WAITOK | M_ZERO); 339 nip->inum = chain->data->ipdata.inum; 340 nip->chain = chain; 341 hammer2_chain_ref(chain); /* nip->chain */ 342 nip->pip = dip; /* can be NULL */ 343 if (dip) 344 hammer2_inode_ref(dip); /* ref dip for nip->pip */ 345 346 nip->pmp = pmp; 347 nip->hmp = hmp; 348 349 /* 350 * ref and lock on nip gives it state compatible to after a 351 * hammer2_inode_lock_ex() call. 352 */ 353 nip->refs = 1; 354 ccms_cst_init(&nip->topo_cst, &nip->chain); 355 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE); 356 /* combination of thread lock and chain lock == inode lock */ 357 358 /* 359 * Attempt to add the inode. If it fails we raced another inode 360 * get. Undo all the work and try again. 361 */ 362 if (pmp) { 363 spin_lock(&pmp->inum_spin); 364 if (RB_INSERT(hammer2_inode_tree, &pmp->inum_tree, nip)) { 365 spin_unlock(&pmp->inum_spin); 366 ccms_thread_unlock(&nip->topo_cst); 367 hammer2_inode_drop(nip); 368 goto again; 369 } 370 atomic_set_int(&nip->flags, HAMMER2_INODE_ONRBTREE); 371 spin_unlock(&pmp->inum_spin); 372 } 373 374 return (nip); 375 } 376 377 /* 378 * Put away an inode, unlocking it and disconnecting it from its chain. 379 * 380 * The inode must be exclusively locked on call and non-recursed, with 381 * at least 2 refs (one belonging to the exclusive lock, and one additional 382 * ref belonging to the caller). 383 * 384 * Upon return the inode typically has one ref remaining which the caller 385 * drops. 386 */ 387 void 388 hammer2_inode_put(hammer2_inode_t *ip) 389 { 390 hammer2_inode_t *pip; 391 hammer2_chain_t *chain; 392 393 /* 394 * Disconnect and unlock chain 395 */ 396 KKASSERT(ip->refs >= 2); 397 KKASSERT(ip->topo_cst.count == -1); /* one excl lock allowed */ 398 if ((chain = ip->chain) != NULL) { 399 ip->chain = NULL; 400 hammer2_inode_unlock_ex(ip); 401 hammer2_chain_unlock(chain); /* because ip->chain now NULL */ 402 hammer2_chain_drop(chain); /* from *_get() */ 403 } 404 405 /* 406 * Disconnect pip 407 */ 408 if ((pip = ip->pip) != NULL) { 409 ip->pip = NULL; 410 hammer2_inode_drop(pip); 411 } 412 } 413 414 /* 415 * Create a new inode in the specified directory using the vattr to 416 * figure out the type of inode. 417 * 418 * If no error occurs the new inode with its chain locked is returned in 419 * *nipp, otherwise an error is returned and *nipp is set to NULL. 420 * 421 * If vap and/or cred are NULL the related fields are not set and the 422 * inode type defaults to a directory. This is used when creating PFSs 423 * under the super-root, so the inode number is set to 1 in this case. 424 * 425 * dip is not locked on entry. 426 */ 427 hammer2_inode_t * 428 hammer2_inode_create(hammer2_trans_t *trans, hammer2_inode_t *dip, 429 struct vattr *vap, struct ucred *cred, 430 const uint8_t *name, size_t name_len, 431 int *errorp) 432 { 433 hammer2_inode_data_t *dipdata; 434 hammer2_inode_data_t *nipdata; 435 hammer2_mount_t *hmp; 436 hammer2_chain_t *chain; 437 hammer2_chain_t *parent; 438 hammer2_inode_t *nip; 439 hammer2_key_t lhc; 440 int error; 441 uid_t xuid; 442 uuid_t dip_uid; 443 uuid_t dip_gid; 444 uint32_t dip_mode; 445 446 hmp = dip->hmp; 447 lhc = hammer2_dirhash(name, name_len); 448 *errorp = 0; 449 450 /* 451 * Locate the inode or indirect block to create the new 452 * entry in. At the same time check for key collisions 453 * and iterate until we don't get one. 454 * 455 * NOTE: hidden inodes do not have iterators. 456 */ 457 retry: 458 hammer2_inode_lock_ex(dip); 459 dipdata = &dip->chain->data->ipdata; 460 dip_uid = dipdata->uid; 461 dip_gid = dipdata->gid; 462 dip_mode = dipdata->mode; 463 464 parent = hammer2_chain_lookup_init(dip->chain, 0); 465 error = 0; 466 while (error == 0) { 467 chain = hammer2_chain_lookup(&parent, lhc, lhc, 0); 468 if (chain == NULL) 469 break; 470 if ((lhc & HAMMER2_DIRHASH_VISIBLE) == 0) 471 error = ENOSPC; 472 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK) 473 error = ENOSPC; 474 hammer2_chain_unlock(chain); 475 chain = NULL; 476 ++lhc; 477 } 478 if (error == 0) { 479 error = hammer2_chain_create(trans, &parent, &chain, 480 lhc, 0, 481 HAMMER2_BREF_TYPE_INODE, 482 HAMMER2_INODE_BYTES); 483 } 484 485 /* 486 * Cleanup and handle retries. 487 */ 488 if (error == EAGAIN) { 489 hammer2_chain_ref(parent); 490 hammer2_chain_lookup_done(parent); 491 hammer2_inode_unlock_ex(dip); 492 hammer2_chain_wait(parent); 493 hammer2_chain_drop(parent); 494 goto retry; 495 } 496 hammer2_chain_lookup_done(parent); 497 hammer2_inode_unlock_ex(dip); 498 499 if (error) { 500 KKASSERT(chain == NULL); 501 *errorp = error; 502 return (NULL); 503 } 504 505 /* 506 * Set up the new inode. 507 * 508 * NOTE: *_get() integrates chain's lock into the inode lock. 509 * 510 * NOTE: Only one new inode can currently be created per 511 * transaction. If the need arises we can adjust 512 * hammer2_trans_init() to allow more. 513 */ 514 chain->data->ipdata.inum = trans->sync_tid; 515 nip = hammer2_inode_get(dip->hmp, dip->pmp, dip, chain); 516 nipdata = &chain->data->ipdata; 517 518 if (vap) { 519 KKASSERT(trans->inodes_created == 0); 520 nipdata->type = hammer2_get_obj_type(vap->va_type); 521 nipdata->inum = trans->sync_tid; 522 ++trans->inodes_created; 523 } else { 524 nipdata->type = HAMMER2_OBJTYPE_DIRECTORY; 525 nipdata->inum = 1; 526 } 527 nipdata->version = HAMMER2_INODE_VERSION_ONE; 528 hammer2_update_time(&nipdata->ctime); 529 nipdata->mtime = nipdata->ctime; 530 if (vap) 531 nipdata->mode = vap->va_mode; 532 nipdata->nlinks = 1; 533 if (vap) { 534 if (dip) { 535 xuid = hammer2_to_unix_xid(&dip_uid); 536 xuid = vop_helper_create_uid(dip->pmp->mp, 537 dip_mode, 538 xuid, 539 cred, 540 &vap->va_mode); 541 } else { 542 xuid = 0; 543 } 544 if (vap->va_vaflags & VA_UID_UUID_VALID) 545 nipdata->uid = vap->va_uid_uuid; 546 else if (vap->va_uid != (uid_t)VNOVAL) 547 hammer2_guid_to_uuid(&nipdata->uid, vap->va_uid); 548 else 549 hammer2_guid_to_uuid(&nipdata->uid, xuid); 550 551 if (vap->va_vaflags & VA_GID_UUID_VALID) 552 nipdata->gid = vap->va_gid_uuid; 553 else if (vap->va_gid != (gid_t)VNOVAL) 554 hammer2_guid_to_uuid(&nipdata->gid, vap->va_gid); 555 else if (dip) 556 nipdata->gid = dip_gid; 557 } 558 559 /* 560 * Regular files and softlinks allow a small amount of data to be 561 * directly embedded in the inode. This flag will be cleared if 562 * the size is extended past the embedded limit. 563 */ 564 if (nipdata->type == HAMMER2_OBJTYPE_REGFILE || 565 nipdata->type == HAMMER2_OBJTYPE_SOFTLINK) { 566 nipdata->op_flags |= HAMMER2_OPFLAG_DIRECTDATA; 567 } 568 569 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 570 bcopy(name, nipdata->filename, name_len); 571 nipdata->name_key = lhc; 572 nipdata->name_len = name_len; 573 574 return (nip); 575 } 576 577 /* 578 * chain may have been moved around by the create. 579 */ 580 static 581 void 582 hammer2_chain_refactor(hammer2_chain_t **chainp) 583 { 584 hammer2_chain_t *chain = *chainp; 585 hammer2_chain_t *tmp; 586 587 while (chain->duplink && (chain->flags & HAMMER2_CHAIN_DELETED)) { 588 tmp = chain->duplink; 589 while (tmp->duplink && (tmp->flags & HAMMER2_CHAIN_DELETED)) 590 tmp = tmp->duplink; 591 hammer2_chain_ref(chain); 592 hammer2_chain_unlock(chain); 593 hammer2_chain_lock(tmp, HAMMER2_RESOLVE_ALWAYS); 594 hammer2_chain_drop(chain); 595 chain = tmp; 596 *chainp = chain; 597 } 598 } 599 600 601 /* 602 * ochain represents the target file inode. We need to move it to the 603 * specified common parent directory (dip) and rename it to a special 604 * invisible "0xINODENUMBER" filename. 605 * 606 * We use chain_duplicate and duplicate ochain at the new location, 607 * renaming it appropriately. We create a temporary chain and 608 * then delete it to placemark where the duplicate will go. Both of 609 * these use the inode number for (lhc) (the key), generating the 610 * invisible filename. 611 */ 612 static 613 hammer2_chain_t * 614 hammer2_hardlink_shiftup(hammer2_trans_t *trans, hammer2_chain_t **ochainp, 615 hammer2_inode_t *dip, int *errorp) 616 { 617 hammer2_inode_data_t *nipdata; 618 hammer2_mount_t *hmp; 619 hammer2_chain_t *parent; 620 hammer2_chain_t *ochain; 621 hammer2_chain_t *nchain; 622 hammer2_chain_t *tmp; 623 hammer2_key_t lhc; 624 hammer2_blockref_t bref; 625 626 ochain = *ochainp; 627 *errorp = 0; 628 hmp = dip->hmp; 629 lhc = ochain->data->ipdata.inum; 630 KKASSERT((lhc & HAMMER2_DIRHASH_VISIBLE) == 0); 631 632 /* 633 * Locate the inode or indirect block to create the new 634 * entry in. lhc represents the inode number so there is 635 * no collision iteration. 636 * 637 * There should be no key collisions with invisible inode keys. 638 */ 639 retry: 640 parent = hammer2_chain_lookup_init(dip->chain, 0); 641 nchain = hammer2_chain_lookup(&parent, lhc, lhc, 0); 642 if (nchain) { 643 kprintf("X3 chain %p parent %p dip %p dip->chain %p\n", 644 nchain, parent, dip, dip->chain); 645 hammer2_chain_unlock(nchain); 646 nchain = NULL; 647 *errorp = ENOSPC; 648 #if 0 649 Debugger("X3"); 650 #endif 651 } 652 653 /* 654 * Create entry in common parent directory using the seek position 655 * calculated above. 656 */ 657 if (*errorp == 0) { 658 KKASSERT(nchain == NULL); 659 *errorp = hammer2_chain_create(trans, &parent, &nchain, 660 lhc, 0, 661 HAMMER2_BREF_TYPE_INODE,/* n/a */ 662 HAMMER2_INODE_BYTES); /* n/a */ 663 hammer2_chain_refactor(&ochain); 664 *ochainp = ochain; 665 } 666 667 /* 668 * Cleanup and handle retries. 669 */ 670 if (*errorp == EAGAIN) { 671 hammer2_chain_ref(parent); 672 hammer2_chain_lookup_done(parent); 673 hammer2_chain_wait(parent); 674 hammer2_chain_drop(parent); 675 goto retry; 676 } 677 678 /* 679 * Handle the error case 680 */ 681 if (*errorp) { 682 KKASSERT(nchain == NULL); 683 hammer2_chain_lookup_done(parent); 684 return (NULL); 685 } 686 687 /* 688 * Use chain as a placeholder for (lhc), delete it and replace 689 * it with our duplication. 690 * 691 * Gain a second lock on ochain for the duplication function to 692 * unlock, maintain the caller's original lock across the call. 693 * 694 * This is a bit messy. 695 */ 696 hammer2_chain_delete(trans, parent, nchain); 697 hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS); 698 tmp = ochain; 699 bref = tmp->bref; 700 bref.key = lhc; /* invisible dir entry key */ 701 bref.keybits = 0; 702 hammer2_chain_duplicate(trans, parent, nchain->index, &tmp, &bref); 703 hammer2_chain_lookup_done(parent); 704 hammer2_chain_unlock(nchain); /* no longer needed */ 705 706 /* 707 * Now set chain to our duplicate and modify it appropriately. 708 * 709 * Directory entries are inodes but this is a hidden hardlink 710 * target. The name isn't used but to ease debugging give it 711 * a name after its inode number. 712 */ 713 nchain = tmp; 714 tmp = NULL; /* safety */ 715 716 hammer2_chain_modify(trans, &nchain, HAMMER2_MODIFY_ASSERTNOCOPY); 717 nipdata = &nchain->data->ipdata; 718 ksnprintf(nipdata->filename, sizeof(nipdata->filename), 719 "0x%016jx", (intmax_t)nipdata->inum); 720 nipdata->name_len = strlen(nipdata->filename); 721 nipdata->name_key = lhc; 722 723 return (nchain); 724 } 725 726 /* 727 * Connect the target inode represented by (*chainp) to the media topology 728 * at (dip, name, len). 729 * 730 * If hlink is TRUE this function creates an OBJTYPE_HARDLINK directory 731 * entry instead of connecting (*chainp). 732 * 733 * If hlink is FALSE this function uses chain_duplicate() to make a copy 734 * if (*chainp) in the directory entry. (*chainp) is likely to be deleted 735 * by the caller in this case (e.g. rename). 736 */ 737 int 738 hammer2_inode_connect(hammer2_trans_t *trans, int hlink, 739 hammer2_inode_t *dip, hammer2_chain_t **chainp, 740 const uint8_t *name, size_t name_len) 741 { 742 hammer2_inode_data_t *ipdata; 743 hammer2_mount_t *hmp; 744 hammer2_chain_t *nchain; 745 hammer2_chain_t *parent; 746 hammer2_chain_t *ochain; 747 hammer2_key_t lhc; 748 int error; 749 750 hmp = dip->hmp; 751 752 ochain = *chainp; 753 754 /* 755 * Since ochain is either disconnected from the topology or represents 756 * a hardlink terminus which is always a parent of or equal to dip, 757 * we should be able to safely lock dip->chain for our setup. 758 */ 759 parent = hammer2_chain_lookup_init(dip->chain, 0); 760 761 lhc = hammer2_dirhash(name, name_len); 762 763 /* 764 * Locate the inode or indirect block to create the new 765 * entry in. At the same time check for key collisions 766 * and iterate until we don't get one. 767 */ 768 error = 0; 769 while (error == 0) { 770 nchain = hammer2_chain_lookup(&parent, lhc, lhc, 0); 771 if (nchain == NULL) 772 break; 773 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK) 774 error = ENOSPC; 775 hammer2_chain_unlock(nchain); 776 nchain = NULL; 777 ++lhc; 778 } 779 780 if (error == 0) { 781 if (hlink) { 782 /* 783 * Hardlink pointer needed, create totally fresh 784 * directory entry. 785 */ 786 KKASSERT(nchain == NULL); 787 error = hammer2_chain_create(trans, &parent, &nchain, 788 lhc, 0, 789 HAMMER2_BREF_TYPE_INODE, 790 HAMMER2_INODE_BYTES); 791 hammer2_chain_refactor(&ochain); 792 } else { 793 /* 794 * Reconnect the original chain and rename. Use 795 * chain_duplicate(). The caller will likely delete 796 * or has already deleted the original chain in 797 * this case. 798 */ 799 nchain = ochain; 800 ochain = NULL; 801 hammer2_chain_duplicate(trans, NULL, -1, &nchain, NULL); 802 error = hammer2_chain_create(trans, &parent, &nchain, 803 lhc, 0, 804 HAMMER2_BREF_TYPE_INODE, 805 HAMMER2_INODE_BYTES); 806 } 807 } 808 809 /* 810 * Unlock stuff. 811 */ 812 KKASSERT(error != EAGAIN); 813 hammer2_chain_lookup_done(parent); 814 parent = NULL; 815 816 /* 817 * nchain should be NULL on error, leave ochain (== *chainp) alone. 818 */ 819 if (error) { 820 KKASSERT(nchain == NULL); 821 return (error); 822 } 823 824 /* 825 * Directory entries are inodes so if the name has changed we have 826 * to update the inode. 827 * 828 * When creating an OBJTYPE_HARDLINK entry remember to unlock the 829 * chain, the caller will access the hardlink via the actual hardlink 830 * target file and not the hardlink pointer entry, so we must still 831 * return ochain. 832 */ 833 if (hlink && hammer2_hardlink_enable >= 0) { 834 /* 835 * Create the HARDLINK pointer. oip represents the hardlink 836 * target in this situation. 837 * 838 * We will return ochain (the hardlink target). 839 */ 840 hammer2_chain_modify(trans, &nchain, 841 HAMMER2_MODIFY_ASSERTNOCOPY); 842 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 843 ipdata = &nchain->data->ipdata; 844 bcopy(name, ipdata->filename, name_len); 845 ipdata->name_key = lhc; 846 ipdata->name_len = name_len; 847 ipdata->target_type = ochain->data->ipdata.type; 848 ipdata->type = HAMMER2_OBJTYPE_HARDLINK; 849 ipdata->inum = ochain->data->ipdata.inum; 850 ipdata->nlinks = 1; 851 hammer2_chain_unlock(nchain); 852 nchain = ochain; 853 ochain = NULL; 854 } else if (hlink && hammer2_hardlink_enable < 0) { 855 /* 856 * Create a snapshot (hardlink fake mode for debugging). 857 * (ochain already flushed above so we can just copy the 858 * bref XXX). 859 * 860 * Since this is a snapshot we return nchain in the fake 861 * hardlink case. 862 */ 863 hammer2_chain_modify(trans, &nchain, 864 HAMMER2_MODIFY_ASSERTNOCOPY); 865 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 866 ipdata = &nchain->data->ipdata; 867 *ipdata = ochain->data->ipdata; 868 bcopy(name, ipdata->filename, name_len); 869 ipdata->name_key = lhc; 870 ipdata->name_len = name_len; 871 kprintf("created fake hardlink %*.*s\n", 872 (int)name_len, (int)name_len, name); 873 } else { 874 /* 875 * nchain is a duplicate of ochain at the new location. 876 * We must fixup the name stored in oip. The bref key 877 * has already been set up. 878 */ 879 hammer2_chain_modify(trans, &nchain, 880 HAMMER2_MODIFY_ASSERTNOCOPY); 881 ipdata = &nchain->data->ipdata; 882 883 KKASSERT(name_len < HAMMER2_INODE_MAXNAME); 884 bcopy(name, ipdata->filename, name_len); 885 ipdata->name_key = lhc; 886 ipdata->name_len = name_len; 887 ipdata->nlinks = 1; 888 } 889 890 /* 891 * We are replacing ochain with nchain, unlock ochain. In the 892 * case where ochain is left unchanged the code above sets 893 * nchain to ochain and ochain to NULL, resulting in a NOP here. 894 */ 895 if (ochain) 896 hammer2_chain_unlock(ochain); 897 *chainp = nchain; 898 899 return (0); 900 } 901 902 /* 903 * Caller must hold exactly ONE exclusive lock on the inode. *nchainp 904 * must be exclusive locked (its own exclusive lock even if it is the 905 * same as ip->chain). 906 * 907 * This function replaces ip->chain. The exclusive lock on the passed 908 * nchain is inherited by the inode and the caller becomes responsible 909 * for unlocking it when the caller unlocks the inode. 910 * 911 * ochain was locked by the caller indirectly via the inode lock. Since 912 * ip->chain is being repointed, we become responsible for cleaning up 913 * that lock. 914 * 915 * Return *nchainp = NULL as a safety. 916 */ 917 void 918 hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip, 919 hammer2_chain_t *nchain) 920 { 921 hammer2_chain_t *ochain; 922 hammer2_inode_t *opip; 923 924 /* 925 * ip->chain points to the hardlink target, not the hardlink psuedo 926 * inode. Do not repoint nchain to the pseudo-node. 927 */ 928 if (nchain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) 929 return; 930 931 /* 932 * Repoint ip->chain if necessary. 933 * 934 * (Inode must be locked exclusively by parent) 935 */ 936 ochain = ip->chain; 937 if (ochain != nchain) { 938 hammer2_chain_ref(nchain); /* for ip->chain */ 939 ip->chain = nchain; 940 if (ochain) { 941 hammer2_chain_unlock(ochain); 942 hammer2_chain_drop(ochain); /* for ip->chain */ 943 } 944 /* replace locked chain in ip (additional lock) */ 945 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_ALWAYS); 946 } 947 if (ip->pip != pip) { 948 opip = ip->pip; 949 if (pip) 950 hammer2_inode_ref(pip); 951 ip->pip = pip; 952 if (opip) 953 hammer2_inode_drop(opip); 954 } 955 } 956 957 /* 958 * Unlink the file from the specified directory inode. The directory inode 959 * does not need to be locked. The caller should pass a non-NULL (ip) 960 * representing the object being removed only if the related vnode is 961 * potentially inactive (not referenced in the caller's active path), 962 * so we can vref/vrele it to trigger the VOP_INACTIVE path and properly 963 * recycle it. 964 * 965 * isdir determines whether a directory/non-directory check should be made. 966 * No check is made if isdir is set to -1. 967 * 968 * NOTE! This function does not prevent the underlying file from still 969 * being used if it has other refs (such as from an inode, or if it's 970 * chain is manually held). However, the caller is responsible for 971 * fixing up ip->chain if e.g. a rename occurs (see chain_duplicate()). 972 */ 973 int 974 hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip, 975 const uint8_t *name, size_t name_len, 976 int isdir, int *hlinkp) 977 { 978 hammer2_inode_data_t *ipdata; 979 hammer2_mount_t *hmp; 980 hammer2_chain_t *parent; 981 hammer2_chain_t *ochain; 982 hammer2_chain_t *chain; 983 hammer2_chain_t *dparent; 984 hammer2_chain_t *dchain; 985 hammer2_key_t lhc; 986 int error; 987 int parent_ref; 988 uint8_t type; 989 990 parent_ref = 0; 991 error = 0; 992 ochain = NULL; 993 hmp = dip->hmp; 994 lhc = hammer2_dirhash(name, name_len); 995 996 /* 997 * Search for the filename in the directory 998 */ 999 if (hlinkp) 1000 *hlinkp = 0; 1001 hammer2_inode_lock_ex(dip); 1002 1003 parent = hammer2_chain_lookup_init(dip->chain, 0); 1004 chain = hammer2_chain_lookup(&parent, 1005 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1006 0); 1007 while (chain) { 1008 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1009 name_len == chain->data->ipdata.name_len && 1010 bcmp(name, chain->data->ipdata.filename, name_len) == 0) { 1011 break; 1012 } 1013 chain = hammer2_chain_next(&parent, chain, 1014 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1015 0); 1016 } 1017 hammer2_inode_unlock_ex(dip); /* retain parent */ 1018 1019 /* 1020 * Not found or wrong type (isdir < 0 disables the type check). 1021 * If a hardlink pointer, type checks use the hardlink target. 1022 */ 1023 if (chain == NULL) { 1024 error = ENOENT; 1025 goto done; 1026 } 1027 if ((type = chain->data->ipdata.type) == HAMMER2_OBJTYPE_HARDLINK) { 1028 if (hlinkp) 1029 *hlinkp = 1; 1030 type = chain->data->ipdata.target_type; 1031 } 1032 1033 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 0) { 1034 error = ENOTDIR; 1035 goto done; 1036 } 1037 if (type != HAMMER2_OBJTYPE_DIRECTORY && isdir == 1) { 1038 error = EISDIR; 1039 goto done; 1040 } 1041 1042 /* 1043 * Hardlink must be resolved. We can't hold parent locked while we 1044 * do this or we could deadlock. 1045 * 1046 * On success chain will be adjusted to point at the hardlink target 1047 * and ochain will point to the hardlink pointer in the original 1048 * directory. Otherwise chain remains pointing to the original. 1049 */ 1050 if (chain->data->ipdata.type == HAMMER2_OBJTYPE_HARDLINK) { 1051 KKASSERT(parent_ref == 0); 1052 hammer2_chain_unlock(parent); 1053 parent = NULL; 1054 error = hammer2_hardlink_find(dip, &chain, &ochain); 1055 } 1056 1057 /* 1058 * If this is a directory the directory must be empty. However, if 1059 * isdir < 0 we are doing a rename and the directory does not have 1060 * to be empty. 1061 * 1062 * NOTE: We check the full key range here which covers both visible 1063 * and invisible entries. Theoretically there should be no 1064 * invisible (hardlink target) entries if there are no visible 1065 * entries. 1066 */ 1067 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir >= 0) { 1068 dparent = hammer2_chain_lookup_init(chain, 0); 1069 dchain = hammer2_chain_lookup(&dparent, 1070 0, (hammer2_key_t)-1, 1071 HAMMER2_LOOKUP_NODATA); 1072 if (dchain) { 1073 hammer2_chain_unlock(dchain); 1074 hammer2_chain_lookup_done(dparent); 1075 error = ENOTEMPTY; 1076 goto done; 1077 } 1078 hammer2_chain_lookup_done(dparent); 1079 dparent = NULL; 1080 /* dchain NULL */ 1081 } 1082 1083 /* 1084 * Ok, we can now unlink the chain. We always decrement nlinks even 1085 * if the entry can be deleted in case someone has the file open and 1086 * does an fstat(). 1087 * 1088 * The chain itself will no longer be in the on-media topology but 1089 * can still be flushed to the media (e.g. if an open descriptor 1090 * remains). When the last vnode/ip ref goes away the chain will 1091 * be marked unmodified, avoiding any further (now unnecesary) I/O. 1092 * 1093 * A non-NULL ochain indicates a hardlink. 1094 */ 1095 if (ochain) { 1096 /* 1097 * Delete the original hardlink pointer. 1098 * 1099 * NOTE: parent from above is NULL when ochain != NULL 1100 * so we can reuse it. 1101 */ 1102 hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS); 1103 parent_ref = 1; 1104 for (;;) { 1105 parent = ochain->parent; 1106 hammer2_chain_ref(parent); 1107 hammer2_chain_unlock(ochain); 1108 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1109 hammer2_chain_lock(ochain, HAMMER2_RESOLVE_ALWAYS); 1110 if (ochain->parent == parent) 1111 break; 1112 hammer2_chain_unlock(parent); 1113 hammer2_chain_drop(parent); 1114 } 1115 1116 hammer2_chain_delete(trans, parent, ochain); 1117 hammer2_chain_unlock(ochain); 1118 hammer2_chain_unlock(parent); 1119 hammer2_chain_drop(parent); 1120 parent = NULL; 1121 1122 /* 1123 * Then decrement nlinks on hardlink target, deleting 1124 * the target when nlinks drops to 0. 1125 */ 1126 if (chain->data->ipdata.nlinks == 1) { 1127 dparent = chain->parent; 1128 hammer2_chain_ref(chain); 1129 hammer2_chain_unlock(chain); 1130 hammer2_chain_lock(dparent, HAMMER2_RESOLVE_ALWAYS); 1131 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS); 1132 hammer2_chain_drop(chain); 1133 hammer2_chain_modify(trans, &chain, 0); 1134 --chain->data->ipdata.nlinks; 1135 hammer2_chain_delete(trans, dparent, chain); 1136 hammer2_chain_unlock(dparent); 1137 } else { 1138 hammer2_chain_modify(trans, &chain, 0); 1139 --chain->data->ipdata.nlinks; 1140 } 1141 } else { 1142 /* 1143 * Otherwise this was not a hardlink and we can just 1144 * remove the entry and decrement nlinks. 1145 * 1146 * NOTE: *_get() integrates chain's lock into the inode lock. 1147 */ 1148 hammer2_chain_modify(trans, &chain, 0); 1149 ipdata = &chain->data->ipdata; 1150 --ipdata->nlinks; 1151 hammer2_chain_delete(trans, parent, chain); 1152 } 1153 1154 error = 0; 1155 done: 1156 if (chain) 1157 hammer2_chain_unlock(chain); 1158 if (parent) { 1159 hammer2_chain_lookup_done(parent); 1160 if (parent_ref) 1161 hammer2_chain_drop(parent); 1162 } 1163 if (ochain) 1164 hammer2_chain_drop(ochain); 1165 1166 return error; 1167 } 1168 1169 /* 1170 * Calculate the allocation size for the file fragment straddling EOF 1171 */ 1172 int 1173 hammer2_inode_calc_alloc(hammer2_key_t filesize) 1174 { 1175 int frag = (int)filesize & HAMMER2_PBUFMASK; 1176 int radix; 1177 1178 if (frag == 0) 1179 return(0); 1180 for (radix = HAMMER2_MINALLOCRADIX; frag > (1 << radix); ++radix) 1181 ; 1182 return (radix); 1183 } 1184 1185 /* 1186 * Given an exclusively locked inode we consolidate its chain for hardlink 1187 * creation, adding (nlinks) to the file's link count and potentially 1188 * relocating the inode to a directory common to ip->pip and tdip. 1189 * 1190 * Returns a locked chain in (*chainp) (the chain's lock is in addition to 1191 * any lock it might already have due to the inode being locked). *chainp 1192 * is set unconditionally and its previous contents can be garbage. 1193 * 1194 * The caller is responsible for replacing ip->chain, not us. For certain 1195 * operations such as renames the caller may do additional manipulation 1196 * of the chain before replacing ip->chain. 1197 */ 1198 int 1199 hammer2_hardlink_consolidate(hammer2_trans_t *trans, hammer2_inode_t *ip, 1200 hammer2_chain_t **chainp, 1201 hammer2_inode_t *tdip, int nlinks) 1202 { 1203 hammer2_inode_data_t *ipdata; 1204 hammer2_mount_t *hmp; 1205 hammer2_inode_t *fdip; 1206 hammer2_inode_t *cdip; 1207 hammer2_chain_t *chain; 1208 hammer2_chain_t *nchain; 1209 hammer2_chain_t *parent; 1210 int error; 1211 1212 /* 1213 * Extra lock on chain so it can be returned locked. 1214 */ 1215 hmp = tdip->hmp; 1216 1217 chain = ip->chain; 1218 error = hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS); 1219 KKASSERT(error == 0); 1220 1221 if (nlinks == 0 && /* no hardlink needed */ 1222 (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE)) { 1223 *chainp = chain; 1224 return (0); 1225 } 1226 if (hammer2_hardlink_enable < 0) { /* fake hardlinks */ 1227 *chainp = chain; 1228 return (0); 1229 } 1230 1231 if (hammer2_hardlink_enable == 0) { /* disallow hardlinks */ 1232 hammer2_chain_unlock(chain); 1233 *chainp = NULL; 1234 return (ENOTSUP); 1235 } 1236 1237 /* 1238 * cdip will be returned with a ref, but not locked. 1239 */ 1240 fdip = ip->pip; 1241 cdip = hammer2_inode_common_parent(fdip, tdip); 1242 1243 /* 1244 * If no change in the hardlink's target directory is required and 1245 * this is already a hardlink target, all we need to do is adjust 1246 * the link count. 1247 * 1248 * XXX The common parent is a big wiggly due to duplication from 1249 * renames. Compare the core (RBTREE) pointer instead of the 1250 * ip's. 1251 */ 1252 if (cdip == fdip && 1253 (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE) == 0) { 1254 if (nlinks) { 1255 hammer2_chain_modify(trans, &chain, 0); 1256 chain->data->ipdata.nlinks += nlinks; 1257 } 1258 *chainp = chain; 1259 error = 0; 1260 goto done; 1261 } 1262 1263 /* 1264 * We either have to move an existing hardlink target or we have 1265 * to create a fresh hardlink target. 1266 * 1267 * Hardlink targets are hidden inodes in a parent directory common 1268 * to all directory entries referencing the hardlink. 1269 */ 1270 nchain = hammer2_hardlink_shiftup(trans, &chain, cdip, &error); 1271 1272 if (error == 0) { 1273 /* 1274 * Bump nlinks on duplicated hidden inode, repoint 1275 * ip->chain. 1276 */ 1277 hammer2_chain_modify(trans, &nchain, 0); 1278 nchain->data->ipdata.nlinks += nlinks; 1279 hammer2_inode_repoint(ip, cdip, nchain); 1280 1281 /* 1282 * If the old chain is not a hardlink target then replace 1283 * it with a OBJTYPE_HARDLINK pointer. 1284 * 1285 * If the old chain IS a hardlink target then delete it. 1286 */ 1287 if (chain->data->ipdata.name_key & HAMMER2_DIRHASH_VISIBLE) { 1288 /* 1289 * Replace original non-hardlink that's been dup'd 1290 * with a special hardlink directory entry. We must 1291 * set the DIRECTDATA flag to prevent sub-chains 1292 * from trying to synchronize to the inode if the 1293 * file is extended afterwords. 1294 */ 1295 hammer2_chain_modify(trans, &chain, 0); 1296 ipdata = &chain->data->ipdata; 1297 ipdata->target_type = ipdata->type; 1298 ipdata->type = HAMMER2_OBJTYPE_HARDLINK; 1299 ipdata->uflags = 0; 1300 ipdata->rmajor = 0; 1301 ipdata->rminor = 0; 1302 ipdata->ctime = 0; 1303 ipdata->mtime = 0; 1304 ipdata->atime = 0; 1305 ipdata->btime = 0; 1306 bzero(&ipdata->uid, sizeof(ipdata->uid)); 1307 bzero(&ipdata->gid, sizeof(ipdata->gid)); 1308 ipdata->op_flags = HAMMER2_OPFLAG_DIRECTDATA; 1309 ipdata->cap_flags = 0; 1310 ipdata->mode = 0; 1311 ipdata->size = 0; 1312 ipdata->nlinks = 1; 1313 ipdata->iparent = 0; /* XXX */ 1314 ipdata->pfs_type = 0; 1315 ipdata->pfs_inum = 0; 1316 bzero(&ipdata->pfs_clid, sizeof(ipdata->pfs_clid)); 1317 bzero(&ipdata->pfs_fsid, sizeof(ipdata->pfs_fsid)); 1318 ipdata->data_quota = 0; 1319 ipdata->data_count = 0; 1320 ipdata->inode_quota = 0; 1321 ipdata->inode_count = 0; 1322 ipdata->attr_tid = 0; 1323 ipdata->dirent_tid = 0; 1324 bzero(&ipdata->u, sizeof(ipdata->u)); 1325 /* XXX transaction ids */ 1326 } else { 1327 kprintf("DELETE INVISIBLE\n"); 1328 for (;;) { 1329 parent = chain->parent; 1330 hammer2_chain_ref(parent); 1331 hammer2_chain_ref(chain); 1332 hammer2_chain_unlock(chain); 1333 hammer2_chain_lock(parent, 1334 HAMMER2_RESOLVE_ALWAYS); 1335 hammer2_chain_lock(chain, 1336 HAMMER2_RESOLVE_ALWAYS); 1337 hammer2_chain_drop(chain); 1338 if (chain->parent == parent) 1339 break; 1340 hammer2_chain_unlock(parent); 1341 hammer2_chain_drop(parent); 1342 } 1343 hammer2_chain_delete(trans, parent, chain); 1344 hammer2_chain_unlock(parent); 1345 hammer2_chain_drop(parent); 1346 } 1347 1348 /* 1349 * Return the new chain. 1350 */ 1351 hammer2_chain_unlock(chain); 1352 *chainp = nchain; 1353 } else { 1354 /* 1355 * Return an error 1356 */ 1357 hammer2_chain_unlock(chain); 1358 *chainp = NULL; 1359 } 1360 1361 /* 1362 * Cleanup, chain/nchain already dealt with. 1363 */ 1364 done: 1365 hammer2_inode_drop(cdip); 1366 1367 return (error); 1368 } 1369 1370 /* 1371 * If (*ochainp) is non-NULL it points to the forward OBJTYPE_HARDLINK 1372 * inode while (*chainp) points to the resolved (hidden hardlink 1373 * target) inode. In this situation when nlinks is 1 we wish to 1374 * deconsolidate the hardlink, moving it back to the directory that now 1375 * represents the only remaining link. 1376 */ 1377 int 1378 hammer2_hardlink_deconsolidate(hammer2_trans_t *trans, 1379 hammer2_inode_t *dip, 1380 hammer2_chain_t **chainp, 1381 hammer2_chain_t **ochainp) 1382 { 1383 if (*ochainp == NULL) 1384 return (0); 1385 /* XXX */ 1386 return (0); 1387 } 1388 1389 /* 1390 * The caller presents a locked *chainp pointing to a HAMMER2_BREF_TYPE_INODE 1391 * with an obj_type of HAMMER2_OBJTYPE_HARDLINK. This routine will gobble 1392 * the *chainp and return a new locked *chainp representing the file target 1393 * (the original *chainp will be unlocked). 1394 * 1395 * When a match is found the chain representing the original HARDLINK 1396 * will be returned in *ochainp with a ref, but not locked. 1397 * 1398 * When no match is found *chainp is set to NULL and EIO is returned. 1399 * (*ochainp) will still be set to the original chain with a ref but not 1400 * locked. 1401 */ 1402 int 1403 hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_chain_t **chainp, 1404 hammer2_chain_t **ochainp) 1405 { 1406 hammer2_chain_t *chain = *chainp; 1407 hammer2_chain_t *parent; 1408 hammer2_inode_t *ip; 1409 hammer2_inode_t *pip; 1410 hammer2_key_t lhc; 1411 1412 pip = dip; 1413 hammer2_inode_ref(pip); /* for loop */ 1414 hammer2_chain_ref(chain); /* for (*ochainp) */ 1415 *ochainp = chain; 1416 1417 /* 1418 * Locate the hardlink. pip is referenced and not locked, 1419 * ipp. 1420 * 1421 * chain is reused. 1422 */ 1423 lhc = chain->data->ipdata.inum; 1424 hammer2_chain_unlock(chain); 1425 chain = NULL; 1426 1427 while ((ip = pip) != NULL) { 1428 hammer2_inode_lock_ex(ip); 1429 parent = hammer2_chain_lookup_init(ip->chain, 0); 1430 hammer2_inode_drop(ip); /* loop */ 1431 KKASSERT(parent->bref.type == HAMMER2_BREF_TYPE_INODE); 1432 chain = hammer2_chain_lookup(&parent, lhc, lhc, 0); 1433 hammer2_chain_lookup_done(parent); 1434 if (chain) 1435 break; 1436 pip = ip->pip; /* safe, ip held locked */ 1437 if (pip) 1438 hammer2_inode_ref(pip); /* loop */ 1439 hammer2_inode_unlock_ex(ip); 1440 } 1441 1442 /* 1443 * chain is locked, ip is locked. Unlock ip, return the locked 1444 * chain. *ipp is already set w/a ref count and not locked. 1445 * 1446 * (parent is already unlocked). 1447 */ 1448 if (ip) 1449 hammer2_inode_unlock_ex(ip); 1450 *chainp = chain; 1451 if (chain) { 1452 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_INODE); 1453 /* already locked */ 1454 return (0); 1455 } else { 1456 return (EIO); 1457 } 1458 } 1459 1460 /* 1461 * Find the directory common to both fdip and tdip, hold and return 1462 * its inode. 1463 */ 1464 hammer2_inode_t * 1465 hammer2_inode_common_parent(hammer2_inode_t *fdip, hammer2_inode_t *tdip) 1466 { 1467 hammer2_inode_t *scan1; 1468 hammer2_inode_t *scan2; 1469 1470 /* 1471 * We used to have a depth field but it complicated matters too 1472 * much for directory renames. So now its ugly. Check for 1473 * simple cases before giving up and doing it the expensive way. 1474 * 1475 * XXX need a bottom-up topology stability lock 1476 */ 1477 if (fdip == tdip || fdip == tdip->pip) { 1478 hammer2_inode_ref(fdip); 1479 return(fdip); 1480 } 1481 if (fdip->pip == tdip) { 1482 hammer2_inode_ref(tdip); 1483 return(tdip); 1484 } 1485 1486 /* 1487 * XXX not MPSAFE 1488 */ 1489 for (scan1 = fdip; scan1->pmp == fdip->pmp; scan1 = scan1->pip) { 1490 scan2 = tdip; 1491 while (scan2->pmp == tdip->pmp) { 1492 if (scan1 == scan2) { 1493 hammer2_inode_ref(scan1); 1494 return(scan1); 1495 } 1496 scan2 = scan2->pip; 1497 if (scan2 == NULL) 1498 break; 1499 } 1500 } 1501 panic("hammer2_inode_common_parent: no common parent %p %p\n", 1502 fdip, tdip); 1503 /* NOT REACHED */ 1504 return(NULL); 1505 } 1506