sys/vfs/hammer2/hammer2_inode.c

   1 /*
   2  * Copyright (c) 2011-2014 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 #define INODE_DEBUG     0
  45
  46 RB_GENERATE2(hammer2_inode_tree, hammer2_inode, rbnode, hammer2_inode_cmp,
  47              hammer2_tid_t, meta.inum);
  48
  49 int
  50 hammer2_inode_cmp(hammer2_inode_t *ip1, hammer2_inode_t *ip2)
  51 {
  52         if (ip1->meta.inum < ip2->meta.inum)
  53                 return(-1);
  54         if (ip1->meta.inum > ip2->meta.inum)
  55                 return(1);
  56         return(0);
  57 }
  58
  59 static
  60 void
  61 hammer2_inode_delayed_sideq(hammer2_inode_t *ip)
  62 {
  63         hammer2_inode_sideq_t *ipul;
  64         hammer2_pfs_t *pmp = ip->pmp;
  65
  66         if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) {
  67                 ipul = kmalloc(sizeof(*ipul), pmp->minode,
  68                                M_WAITOK | M_ZERO);
  69                 ipul->ip = ip;
  70                 hammer2_spin_ex(&pmp->list_spin);
  71                 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) {
  72                         hammer2_inode_ref(ip);
  73                         atomic_set_int(&ip->flags,
  74                                        HAMMER2_INODE_ONSIDEQ);
  75                         TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry);
  76                         hammer2_spin_unex(&pmp->list_spin);
  77                 } else {
  78                         hammer2_spin_unex(&pmp->list_spin);
  79                         kfree(ipul, pmp->minode);
  80                 }
  81         }
  82 }
  83
  84 /*
  85  * HAMMER2 inode locks
  86  *
  87  * HAMMER2 offers shared and exclusive locks on inodes.  Pass a mask of
  88  * flags for options:
  89  *
  90  *      - pass HAMMER2_RESOLVE_SHARED if a shared lock is desired.  The
  91  *        inode locking function will automatically set the RDONLY flag.
  92  *
  93  *      - pass HAMMER2_RESOLVE_ALWAYS if you need the inode's meta-data.
  94  *        Most front-end inode locks do.
  95  *
  96  *      - pass HAMMER2_RESOLVE_NEVER if you do not want to require that
  97  *        the inode data be resolved.  This is used by the syncthr because
  98  *        it can run on an unresolved/out-of-sync cluster, and also by the
  99  *        vnode reclamation code to avoid unnecessary I/O (particularly when
 100  *        disposing of hundreds of thousands of cached vnodes).
 101  *
 102  * The inode locking function locks the inode itself, resolves any stale
 103  * chains in the inode's cluster, and allocates a fresh copy of the
 104  * cluster with 1 ref and all the underlying chains locked.
 105  *
 106  * ip->cluster will be stable while the inode is locked.
 107  *
 108  * NOTE: We don't combine the inode/chain lock because putting away an
 109  *       inode would otherwise confuse multiple lock holders of the inode.
 110  *
 111  * NOTE: In-memory inodes always point to hardlink targets (the actual file),
 112  *       and never point to a hardlink pointer.
 113  *
 114  * NOTE: If caller passes HAMMER2_RESOLVE_RDONLY the exclusive locking code
 115  *       will feel free to reduce the chain set in the cluster as an
 116  *       optimization.  It will still be validated against the quorum if
 117  *       appropriate, but the optimization might be able to reduce data
 118  *       accesses to one node.  This flag is automatically set if the inode
 119  *       is locked with HAMMER2_RESOLVE_SHARED.
 120  */
 121 void
 122 hammer2_inode_lock(hammer2_inode_t *ip, int how)
 123 {
 124         hammer2_inode_ref(ip);
 125
 126         /*
 127          * Inode structure mutex
 128          */
 129         if (how & HAMMER2_RESOLVE_SHARED) {
 130                 /*how |= HAMMER2_RESOLVE_RDONLY; not used */
 131                 hammer2_mtx_sh(&ip->lock);
 132         } else {
 133                 hammer2_mtx_ex(&ip->lock);
 134         }
 135 }
 136
 137 /*
 138  * Select a chain out of an inode's cluster and lock it.
 139  *
 140  * The inode does not have to be locked.
 141  */
 142 hammer2_chain_t *
 143 hammer2_inode_chain(hammer2_inode_t *ip, int clindex, int how)
 144 {
 145         hammer2_chain_t *chain;
 146         hammer2_cluster_t *cluster;
 147
 148         hammer2_spin_sh(&ip->cluster_spin);
 149 #if 0
 150         cluster = ip->cluster_cache;
 151         if (cluster) {
 152                 if (clindex >= cluster->nchains)
 153                         chain = NULL;
 154                 else
 155                         chain = cluster->array[clindex].chain;
 156                 if (chain) {
 157                         hammer2_chain_ref(chain);
 158                         hammer2_spin_unsh(&ip->cluster_spin);
 159                         hammer2_chain_lock(chain, how);
 160                         return chain;
 161                 }
 162         }
 163 #endif
 164
 165         cluster = &ip->cluster;
 166         if (clindex >= cluster->nchains)
 167                 chain = NULL;
 168         else
 169                 chain = cluster->array[clindex].chain;
 170         if (chain) {
 171                 hammer2_chain_ref(chain);
 172                 hammer2_spin_unsh(&ip->cluster_spin);
 173                 hammer2_chain_lock(chain, how);
 174         } else {
 175                 hammer2_spin_unsh(&ip->cluster_spin);
 176         }
 177         return chain;
 178 }
 179
 180 hammer2_chain_t *
 181 hammer2_inode_chain_and_parent(hammer2_inode_t *ip, int clindex,
 182                                hammer2_chain_t **parentp, int how)
 183 {
 184         hammer2_chain_t *chain;
 185         hammer2_chain_t *parent;
 186
 187         for (;;) {
 188                 hammer2_spin_sh(&ip->cluster_spin);
 189                 if (clindex >= ip->cluster.nchains)
 190                         chain = NULL;
 191                 else
 192                         chain = ip->cluster.array[clindex].chain;
 193                 if (chain) {
 194                         hammer2_chain_ref(chain);
 195                         hammer2_spin_unsh(&ip->cluster_spin);
 196                         hammer2_chain_lock(chain, how);
 197                 } else {
 198                         hammer2_spin_unsh(&ip->cluster_spin);
 199                 }
 200
 201                 /*
 202                  * Get parent, lock order must be (parent, chain).
 203                  */
 204                 parent = chain->parent;
 205                 hammer2_chain_ref(parent);
 206                 hammer2_chain_unlock(chain);
 207                 hammer2_chain_lock(parent, how);
 208                 hammer2_chain_lock(chain, how);
 209                 if (ip->cluster.array[clindex].chain == chain &&
 210                     chain->parent == parent) {
 211                         break;
 212                 }
 213
 214                 /*
 215                  * Retry
 216                  */
 217                 hammer2_chain_unlock(chain);
 218                 hammer2_chain_drop(chain);
 219                 hammer2_chain_unlock(parent);
 220                 hammer2_chain_drop(parent);
 221         }
 222         *parentp = parent;
 223
 224         return chain;
 225 }
 226
 227 void
 228 hammer2_inode_unlock(hammer2_inode_t *ip)
 229 {
 230         hammer2_mtx_unlock(&ip->lock);
 231         hammer2_inode_drop(ip);
 232 }
 233
 234 /*
 235  * Temporarily release a lock held shared or exclusive.  Caller must
 236  * hold the lock shared or exclusive on call and lock will be released
 237  * on return.
 238  *
 239  * Restore a lock that was temporarily released.
 240  */
 241 hammer2_mtx_state_t
 242 hammer2_inode_lock_temp_release(hammer2_inode_t *ip)
 243 {
 244         return hammer2_mtx_temp_release(&ip->lock);
 245 }
 246
 247 void
 248 hammer2_inode_lock_temp_restore(hammer2_inode_t *ip, hammer2_mtx_state_t ostate)
 249 {
 250         hammer2_mtx_temp_restore(&ip->lock, ostate);
 251 }
 252
 253 /*
 254  * Upgrade a shared inode lock to exclusive and return.  If the inode lock
 255  * is already held exclusively this is a NOP.
 256  *
 257  * The caller MUST hold the inode lock either shared or exclusive on call
 258  * and will own the lock exclusively on return.
 259  *
 260  * Returns non-zero if the lock was already exclusive prior to the upgrade.
 261  */
 262 int
 263 hammer2_inode_lock_upgrade(hammer2_inode_t *ip)
 264 {
 265         int wasexclusive;
 266
 267         if (mtx_islocked_ex(&ip->lock)) {
 268                 wasexclusive = 1;
 269         } else {
 270                 hammer2_mtx_unlock(&ip->lock);
 271                 hammer2_mtx_ex(&ip->lock);
 272                 wasexclusive = 0;
 273         }
 274         return wasexclusive;
 275 }
 276
 277 /*
 278  * Downgrade an inode lock from exclusive to shared only if the inode
 279  * lock was previously shared.  If the inode lock was previously exclusive,
 280  * this is a NOP.
 281  */
 282 void
 283 hammer2_inode_lock_downgrade(hammer2_inode_t *ip, int wasexclusive)
 284 {
 285         if (wasexclusive == 0)
 286                 mtx_downgrade(&ip->lock);
 287 }
 288
 289 /*
 290  * Lookup an inode by inode number
 291  */
 292 hammer2_inode_t *
 293 hammer2_inode_lookup(hammer2_pfs_t *pmp, hammer2_tid_t inum)
 294 {
 295         hammer2_inode_t *ip;
 296
 297         KKASSERT(pmp);
 298         if (pmp->spmp_hmp) {
 299                 ip = NULL;
 300         } else {
 301                 hammer2_spin_ex(&pmp->inum_spin);
 302                 ip = RB_LOOKUP(hammer2_inode_tree, &pmp->inum_tree, inum);
 303                 if (ip)
 304                         hammer2_inode_ref(ip);
 305                 hammer2_spin_unex(&pmp->inum_spin);
 306         }
 307         return(ip);
 308 }
 309
 310 /*
 311  * Adding a ref to an inode is only legal if the inode already has at least
 312  * one ref.
 313  *
 314  * (can be called with spinlock held)
 315  */
 316 void
 317 hammer2_inode_ref(hammer2_inode_t *ip)
 318 {
 319         atomic_add_int(&ip->refs, 1);
 320         if (hammer2_debug & 0x80000) {
 321                 kprintf("INODE+1 %p (%d->%d)\n", ip, ip->refs - 1, ip->refs);
 322                 print_backtrace(8);
 323         }
 324 }
 325
 326 /*
 327  * Drop an inode reference, freeing the inode when the last reference goes
 328  * away.
 329  */
 330 void
 331 hammer2_inode_drop(hammer2_inode_t *ip)
 332 {
 333         hammer2_pfs_t *pmp;
 334         u_int refs;
 335
 336         while (ip) {
 337                 if (hammer2_debug & 0x80000) {
 338                         kprintf("INODE-1 %p (%d->%d)\n",
 339                                 ip, ip->refs, ip->refs - 1);
 340                         print_backtrace(8);
 341                 }
 342                 refs = ip->refs;
 343                 cpu_ccfence();
 344                 if (refs == 1) {
 345                         /*
 346                          * Transition to zero, must interlock with
 347                          * the inode inumber lookup tree (if applicable).
 348                          * It should not be possible for anyone to race
 349                          * the transition to 0.
 350                          */
 351                         pmp = ip->pmp;
 352                         KKASSERT(pmp);
 353                         hammer2_spin_ex(&pmp->inum_spin);
 354
 355                         if (atomic_cmpset_int(&ip->refs, 1, 0)) {
 356                                 KKASSERT(hammer2_mtx_refs(&ip->lock) == 0);
 357                                 if (ip->flags & HAMMER2_INODE_ONRBTREE) {
 358                                         atomic_clear_int(&ip->flags,
 359                                                      HAMMER2_INODE_ONRBTREE);
 360                                         RB_REMOVE(hammer2_inode_tree,
 361                                                   &pmp->inum_tree, ip);
 362                                 }
 363                                 hammer2_spin_unex(&pmp->inum_spin);
 364
 365                                 ip->pmp = NULL;
 366
 367 #if 0
 368                                 /*
 369                                  * Clean out the cluster cache
 370                                  */
 371                                 hammer2_cluster_t *tmpclu;
 372                                 tmpclu = ip->cluster_cache;
 373                                 if (tmpclu) {
 374                                         ip->cluster_cache = NULL;
 375                                         hammer2_cluster_drop(tmpclu);
 376                                 }
 377 #endif
 378
 379                                 /*
 380                                  * Cleaning out ip->cluster isn't entirely
 381                                  * trivial.
 382                                  */
 383                                 hammer2_inode_repoint(ip, NULL, NULL);
 384
 385                                 kfree(ip, pmp->minode);
 386                                 atomic_add_long(&pmp->inmem_inodes, -1);
 387                                 ip = NULL;      /* will terminate loop */
 388                         } else {
 389                                 hammer2_spin_unex(&ip->pmp->inum_spin);
 390                         }
 391                 } else {
 392                         /*
 393                          * Non zero transition
 394                          */
 395                         if (atomic_cmpset_int(&ip->refs, refs, refs - 1))
 396                                 break;
 397                 }
 398         }
 399 }
 400
 401 /*
 402  * Get the vnode associated with the given inode, allocating the vnode if
 403  * necessary.  The vnode will be returned exclusively locked.
 404  *
 405  * The caller must lock the inode (shared or exclusive).
 406  *
 407  * Great care must be taken to avoid deadlocks and vnode acquisition/reclaim
 408  * races.
 409  */
 410 struct vnode *
 411 hammer2_igetv(hammer2_inode_t *ip, int *errorp)
 412 {
 413         hammer2_pfs_t *pmp;
 414         struct vnode *vp;
 415
 416         pmp = ip->pmp;
 417         KKASSERT(pmp != NULL);
 418         *errorp = 0;
 419
 420         for (;;) {
 421                 /*
 422                  * Attempt to reuse an existing vnode assignment.  It is
 423                  * possible to race a reclaim so the vget() may fail.  The
 424                  * inode must be unlocked during the vget() to avoid a
 425                  * deadlock against a reclaim.
 426                  */
 427                 int wasexclusive;
 428
 429                 vp = ip->vp;
 430                 if (vp) {
 431                         /*
 432                          * Inode must be unlocked during the vget() to avoid
 433                          * possible deadlocks, but leave the ip ref intact.
 434                          *
 435                          * vnode is held to prevent destruction during the
 436                          * vget().  The vget() can still fail if we lost
 437                          * a reclaim race on the vnode.
 438                          */
 439                         hammer2_mtx_state_t ostate;
 440
 441                         vhold(vp);
 442                         ostate = hammer2_inode_lock_temp_release(ip);
 443                         if (vget(vp, LK_EXCLUSIVE)) {
 444                                 vdrop(vp);
 445                                 hammer2_inode_lock_temp_restore(ip, ostate);
 446                                 continue;
 447                         }
 448                         hammer2_inode_lock_temp_restore(ip, ostate);
 449                         vdrop(vp);
 450                         /* vp still locked and ref from vget */
 451                         if (ip->vp != vp) {
 452                                 kprintf("hammer2: igetv race %p/%p\n",
 453                                         ip->vp, vp);
 454                                 vput(vp);
 455                                 continue;
 456                         }
 457                         *errorp = 0;
 458                         break;
 459                 }
 460
 461                 /*
 462                  * No vnode exists, allocate a new vnode.  Beware of
 463                  * allocation races.  This function will return an
 464                  * exclusively locked and referenced vnode.
 465                  */
 466                 *errorp = getnewvnode(VT_HAMMER2, pmp->mp, &vp, 0, 0);
 467                 if (*errorp) {
 468                         kprintf("hammer2: igetv getnewvnode failed %d\n",
 469                                 *errorp);
 470                         vp = NULL;
 471                         break;
 472                 }
 473
 474                 /*
 475                  * Lock the inode and check for an allocation race.
 476                  */
 477                 wasexclusive = hammer2_inode_lock_upgrade(ip);
 478                 if (ip->vp != NULL) {
 479                         vp->v_type = VBAD;
 480                         vx_put(vp);
 481                         hammer2_inode_lock_downgrade(ip, wasexclusive);
 482                         continue;
 483                 }
 484
 485                 switch (ip->meta.type) {
 486                 case HAMMER2_OBJTYPE_DIRECTORY:
 487                         vp->v_type = VDIR;
 488                         break;
 489                 case HAMMER2_OBJTYPE_REGFILE:
 490                         vp->v_type = VREG;
 491                         vinitvmio(vp, ip->meta.size,
 492                                   HAMMER2_LBUFSIZE,
 493                                   (int)ip->meta.size & HAMMER2_LBUFMASK);
 494                         break;
 495                 case HAMMER2_OBJTYPE_SOFTLINK:
 496                         /*
 497                          * XXX for now we are using the generic file_read
 498                          * and file_write code so we need a buffer cache
 499                          * association.
 500                          */
 501                         vp->v_type = VLNK;
 502                         vinitvmio(vp, ip->meta.size,
 503                                   HAMMER2_LBUFSIZE,
 504                                   (int)ip->meta.size & HAMMER2_LBUFMASK);
 505                         break;
 506                 case HAMMER2_OBJTYPE_CDEV:
 507                         vp->v_type = VCHR;
 508                         /* fall through */
 509                 case HAMMER2_OBJTYPE_BDEV:
 510                         vp->v_ops = &pmp->mp->mnt_vn_spec_ops;
 511                         if (ip->meta.type != HAMMER2_OBJTYPE_CDEV)
 512                                 vp->v_type = VBLK;
 513                         addaliasu(vp,
 514                                   ip->meta.rmajor,
 515                                   ip->meta.rminor);
 516                         break;
 517                 case HAMMER2_OBJTYPE_FIFO:
 518                         vp->v_type = VFIFO;
 519                         vp->v_ops = &pmp->mp->mnt_vn_fifo_ops;
 520                         break;
 521                 case HAMMER2_OBJTYPE_SOCKET:
 522                         vp->v_type = VSOCK;
 523                         break;
 524                 default:
 525                         panic("hammer2: unhandled objtype %d",
 526                               ip->meta.type);
 527                         break;
 528                 }
 529
 530                 if (ip == pmp->iroot)
 531                         vsetflags(vp, VROOT);
 532
 533                 vp->v_data = ip;
 534                 ip->vp = vp;
 535                 hammer2_inode_ref(ip);          /* vp association */
 536                 hammer2_inode_lock_downgrade(ip, wasexclusive);
 537                 break;
 538         }
 539
 540         /*
 541          * Return non-NULL vp and *errorp == 0, or NULL vp and *errorp != 0.
 542          */
 543         if (hammer2_debug & 0x0002) {
 544                 kprintf("igetv vp %p refs 0x%08x aux 0x%08x\n",
 545                         vp, vp->v_refcnt, vp->v_auxrefs);
 546         }
 547         return (vp);
 548 }
 549
 550 /*
 551  * Returns the inode associated with the passed-in cluster, creating the
 552  * inode if necessary and synchronizing it to the passed-in cluster otherwise.
 553  * When synchronizing, if idx >= 0, only cluster index (idx) is synchronized.
 554  * Otherwise the whole cluster is synchronized.
 555  *
 556  * The passed-in cluster must be locked and will remain locked on return.
 557  * The returned inode will be locked and the caller may dispose of both
 558  * via hammer2_inode_unlock() + hammer2_inode_drop().  However, if the caller
 559  * needs to resolve a hardlink it must ref/unlock/relock/drop the inode.
 560  *
 561  * The hammer2_inode structure regulates the interface between the high level
 562  * kernel VNOPS API and the filesystem backend (the chains).
 563  *
 564  * On return the inode is locked with the supplied cluster.
 565  */
 566 hammer2_inode_t *
 567 hammer2_inode_get(hammer2_pfs_t *pmp, hammer2_inode_t *dip,
 568                   hammer2_cluster_t *cluster, int idx)
 569 {
 570         hammer2_inode_t *nip;
 571         const hammer2_inode_data_t *iptmp;
 572         const hammer2_inode_data_t *nipdata;
 573
 574         KKASSERT(cluster == NULL ||
 575                  hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE);
 576         KKASSERT(pmp);
 577
 578         /*
 579          * Interlocked lookup/ref of the inode.  This code is only needed
 580          * when looking up inodes with nlinks != 0 (TODO: optimize out
 581          * otherwise and test for duplicates).
 582          *
 583          * Cluster can be NULL during the initial pfs allocation.
 584          */
 585 again:
 586         while (cluster) {
 587                 iptmp = &hammer2_cluster_rdata(cluster)->ipdata;
 588                 nip = hammer2_inode_lookup(pmp, iptmp->meta.inum);
 589                 if (nip == NULL)
 590                         break;
 591
 592                 hammer2_mtx_ex(&nip->lock);
 593
 594                 /*
 595                  * Handle SMP race (not applicable to the super-root spmp
 596                  * which can't index inodes due to duplicative inode numbers).
 597                  */
 598                 if (pmp->spmp_hmp == NULL &&
 599                     (nip->flags & HAMMER2_INODE_ONRBTREE) == 0) {
 600                         hammer2_mtx_unlock(&nip->lock);
 601                         hammer2_inode_drop(nip);
 602                         continue;
 603                 }
 604                 if (idx >= 0)
 605                         hammer2_inode_repoint_one(nip, cluster, idx);
 606                 else
 607                         hammer2_inode_repoint(nip, NULL, cluster);
 608
 609                 return nip;
 610         }
 611
 612         /*
 613          * We couldn't find the inode number, create a new inode.
 614          */
 615         nip = kmalloc(sizeof(*nip), pmp->minode, M_WAITOK | M_ZERO);
 616         spin_init(&nip->cluster_spin, "h2clspin");
 617         atomic_add_long(&pmp->inmem_inodes, 1);
 618         hammer2_pfs_memory_inc(pmp);
 619         hammer2_pfs_memory_wakeup(pmp);
 620         if (pmp->spmp_hmp)
 621                 nip->flags = HAMMER2_INODE_SROOT;
 622
 623         /*
 624          * Initialize nip's cluster.  A cluster is provided for normal
 625          * inodes but typically not for the super-root or PFS inodes.
 626          */
 627         nip->cluster.refs = 1;
 628         nip->cluster.pmp = pmp;
 629         nip->cluster.flags |= HAMMER2_CLUSTER_INODE;
 630         if (cluster) {
 631                 nipdata = &hammer2_cluster_rdata(cluster)->ipdata;
 632                 nip->meta = nipdata->meta;
 633                 atomic_set_int(&nip->flags, HAMMER2_INODE_METAGOOD);
 634                 hammer2_inode_repoint(nip, NULL, cluster);
 635         } else {
 636                 nip->meta.inum = 1;             /* PFS inum is always 1 XXX */
 637                 /* mtime will be updated when a cluster is available */
 638                 atomic_set_int(&nip->flags, HAMMER2_INODE_METAGOOD);/*XXX*/
 639         }
 640
 641         nip->pmp = pmp;
 642
 643         /*
 644          * ref and lock on nip gives it state compatible to after a
 645          * hammer2_inode_lock() call.
 646          */
 647         nip->refs = 1;
 648         hammer2_mtx_init(&nip->lock, "h2inode");
 649         hammer2_mtx_ex(&nip->lock);
 650         /* combination of thread lock and chain lock == inode lock */
 651
 652         /*
 653          * Attempt to add the inode.  If it fails we raced another inode
 654          * get.  Undo all the work and try again.
 655          */
 656         if (pmp->spmp_hmp == NULL) {
 657                 hammer2_spin_ex(&pmp->inum_spin);
 658                 if (RB_INSERT(hammer2_inode_tree, &pmp->inum_tree, nip)) {
 659                         hammer2_spin_unex(&pmp->inum_spin);
 660                         hammer2_mtx_unlock(&nip->lock);
 661                         hammer2_inode_drop(nip);
 662                         goto again;
 663                 }
 664                 atomic_set_int(&nip->flags, HAMMER2_INODE_ONRBTREE);
 665                 hammer2_spin_unex(&pmp->inum_spin);
 666         }
 667
 668         return (nip);
 669 }
 670
 671 /*
 672  * Create a new inode in the specified directory using the vattr to
 673  * figure out the type.  A non-zero type field overrides vattr.
 674  *
 675  * If no error occurs the new inode with its cluster locked is returned.
 676  * However, when creating an OBJTYPE_HARDLINK, the caller can assume
 677  * that NULL will be returned (that is, the caller already has the inode
 678  * in-hand and is creating a hardlink to it, we do not need to return a
 679  * representitive ip).
 680  *
 681  * If vap and/or cred are NULL the related fields are not set and the
 682  * inode type defaults to a directory.  This is used when creating PFSs
 683  * under the super-root, so the inode number is set to 1 in this case.
 684  *
 685  * dip is not locked on entry.
 686  *
 687  * NOTE: This function is used to create all manners of inodes, including
 688  *       super-root entries for snapshots and PFSs.  When used to create a
 689  *       snapshot the inode will be temporarily associated with the spmp.
 690  *
 691  * NOTE: When creating a normal file or directory the caller must call this
 692  *       function twice, once to create the actual inode and once to create
 693  *       the hardlink representing the directory entry.  This function is
 694  *       only called once when creating a softlink.  The softlink itself.
 695  *
 696  * NOTE: When creating a hardlink target (a real inode), name/name_len is
 697  *       passed as NULL/0, and caller should pass lhc as inum.
 698  */
 699 hammer2_inode_t *
 700 hammer2_inode_create(hammer2_inode_t *dip, hammer2_inode_t *pip,
 701                      struct vattr *vap, struct ucred *cred,
 702                      const uint8_t *name, size_t name_len, hammer2_key_t lhc,
 703                      hammer2_key_t inum,
 704                      uint8_t type, uint8_t target_type,
 705                      int flags, int *errorp)
 706 {
 707         hammer2_xop_create_t *xop;
 708         hammer2_inode_t *nip;
 709         int error;
 710         uid_t xuid;
 711         uuid_t pip_uid;
 712         uuid_t pip_gid;
 713         uint32_t pip_mode;
 714         uint8_t pip_comp_algo;
 715         uint8_t pip_check_algo;
 716         hammer2_tid_t pip_inum;
 717
 718         if (name)
 719                 lhc = hammer2_dirhash(name, name_len);
 720         *errorp = 0;
 721         nip = NULL;
 722
 723         /*
 724          * Locate the inode or indirect block to create the new
 725          * entry in.  At the same time check for key collisions
 726          * and iterate until we don't get one.
 727          *
 728          * Lock the directory exclusively for now to guarantee that
 729          * we can find an unused lhc for the name.  Due to collisions,
 730          * two different creates can end up with the same lhc so we
 731          * cannot depend on the OS to prevent the collision.
 732          */
 733         hammer2_inode_lock(dip, 0);
 734
 735         pip_uid = pip->meta.uid;
 736         pip_gid = pip->meta.gid;
 737         pip_mode = pip->meta.mode;
 738         pip_comp_algo = pip->meta.comp_algo;
 739         pip_check_algo = pip->meta.check_algo;
 740         pip_inum = (pip == pip->pmp->iroot) ? 0 : pip->meta.inum;
 741
 742         /*
 743          * If name specified, locate an unused key in the collision space.
 744          * Otherwise use the passed-in lhc directly.
 745          */
 746         if (name) {
 747                 hammer2_xop_scanlhc_t *sxop;
 748                 hammer2_key_t lhcbase;
 749
 750                 lhcbase = lhc;
 751                 sxop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
 752                 sxop->lhc = lhc;
 753                 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
 754                 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
 755                         if (lhc != sxop->head.cluster.focus->bref.key)
 756                                 break;
 757                         ++lhc;
 758                 }
 759                 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
 760
 761                 if (error) {
 762                         if (error != ENOENT)
 763                                 goto done2;
 764                         ++lhc;
 765                         error = 0;
 766                 }
 767                 if ((lhcbase ^ lhc) & ~HAMMER2_DIRHASH_LOMASK) {
 768                         error = ENOSPC;
 769                         goto done2;
 770                 }
 771         }
 772
 773         /*
 774          * Create the inode with the lhc as the key.
 775          */
 776         xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
 777         xop->lhc = lhc;
 778         xop->flags = flags;
 779         bzero(&xop->meta, sizeof(xop->meta));
 780
 781         if (vap) {
 782                 xop->meta.type = hammer2_get_obj_type(vap->va_type);
 783
 784                 switch (xop->meta.type) {
 785                 case HAMMER2_OBJTYPE_CDEV:
 786                 case HAMMER2_OBJTYPE_BDEV:
 787                         xop->meta.rmajor = vap->va_rmajor;
 788                         xop->meta.rminor = vap->va_rminor;
 789                         break;
 790                 default:
 791                         break;
 792                 }
 793                 type = xop->meta.type;
 794         } else {
 795                 xop->meta.type = type;
 796                 xop->meta.target_type = target_type;
 797         }
 798         xop->meta.inum = inum;
 799         xop->meta.iparent = pip_inum;
 800
 801         /* Inherit parent's inode compression mode. */
 802         xop->meta.comp_algo = pip_comp_algo;
 803         xop->meta.check_algo = pip_check_algo;
 804         xop->meta.version = HAMMER2_INODE_VERSION_ONE;
 805         hammer2_update_time(&xop->meta.ctime);
 806         xop->meta.mtime = xop->meta.ctime;
 807         if (vap)
 808                 xop->meta.mode = vap->va_mode;
 809         xop->meta.nlinks = 1;
 810         if (vap) {
 811                 if (dip->pmp) {
 812                         xuid = hammer2_to_unix_xid(&pip_uid);
 813                         xuid = vop_helper_create_uid(dip->pmp->mp,
 814                                                      pip_mode,
 815                                                      xuid,
 816                                                      cred,
 817                                                      &vap->va_mode);
 818                 } else {
 819                         /* super-root has no dip and/or pmp */
 820                         xuid = 0;
 821                 }
 822                 if (vap->va_vaflags & VA_UID_UUID_VALID)
 823                         xop->meta.uid = vap->va_uid_uuid;
 824                 else if (vap->va_uid != (uid_t)VNOVAL)
 825                         hammer2_guid_to_uuid(&xop->meta.uid, vap->va_uid);
 826                 else
 827                         hammer2_guid_to_uuid(&xop->meta.uid, xuid);
 828
 829                 if (vap->va_vaflags & VA_GID_UUID_VALID)
 830                         xop->meta.gid = vap->va_gid_uuid;
 831                 else if (vap->va_gid != (gid_t)VNOVAL)
 832                         hammer2_guid_to_uuid(&xop->meta.gid, vap->va_gid);
 833                 else
 834                         xop->meta.gid = pip_gid;
 835         }
 836
 837         /*
 838          * Regular files and softlinks allow a small amount of data to be
 839          * directly embedded in the inode.  This flag will be cleared if
 840          * the size is extended past the embedded limit.
 841          */
 842         if (xop->meta.type == HAMMER2_OBJTYPE_REGFILE ||
 843             xop->meta.type == HAMMER2_OBJTYPE_SOFTLINK ||
 844             xop->meta.type == HAMMER2_OBJTYPE_HARDLINK) {
 845                 xop->meta.op_flags |= HAMMER2_OPFLAG_DIRECTDATA;
 846         }
 847         if (name) {
 848                 hammer2_xop_setname(&xop->head, name, name_len);
 849         } else {
 850                 name_len = hammer2_xop_setname_inum(&xop->head, inum);
 851                 KKASSERT(lhc == inum);
 852         }
 853         xop->meta.name_len = name_len;
 854         xop->meta.name_key = lhc;
 855         KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
 856
 857         hammer2_xop_start(&xop->head, hammer2_inode_xop_create);
 858
 859         error = hammer2_xop_collect(&xop->head, 0);
 860 #if INODE_DEBUG
 861         kprintf("CREATE INODE %*.*s\n",
 862                 (int)name_len, (int)name_len, name);
 863 #endif
 864
 865         if (error) {
 866                 *errorp = error;
 867                 goto done;
 868         }
 869
 870         /*
 871          * Set up the new inode if not a hardlink pointer.
 872          *
 873          * NOTE: *_get() integrates chain's lock into the inode lock.
 874          *
 875          * NOTE: Only one new inode can currently be created per
 876          *       transaction.  If the need arises we can adjust
 877          *       hammer2_trans_init() to allow more.
 878          *
 879          * NOTE: nipdata will have chain's blockset data.
 880          */
 881         if (type != HAMMER2_OBJTYPE_HARDLINK) {
 882                 nip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
 883                 nip->comp_heuristic = 0;
 884         } else {
 885                 nip = NULL;
 886         }
 887
 888 done:
 889         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
 890 done2:
 891         hammer2_inode_unlock(dip);
 892
 893         return (nip);
 894 }
 895
 896 /*
 897  * Repoint ip->cluster's chains to cluster's chains and fixup the default
 898  * focus.  All items, valid or invalid, are repointed.  hammer2_xop_start()
 899  * filters out invalid or non-matching elements.
 900  *
 901  * Caller must hold the inode and cluster exclusive locked, if not NULL,
 902  * must also be locked.
 903  *
 904  * Cluster may be NULL to clean out any chains in ip->cluster.
 905  */
 906 void
 907 hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip,
 908                       hammer2_cluster_t *cluster)
 909 {
 910         hammer2_chain_t *dropch[HAMMER2_MAXCLUSTER];
 911         hammer2_chain_t *ochain;
 912         hammer2_chain_t *nchain;
 913         int i;
 914
 915         bzero(dropch, sizeof(dropch));
 916
 917         /*
 918          * Replace chains in ip->cluster with chains from cluster and
 919          * adjust the focus if necessary.
 920          *
 921          * NOTE: nchain and/or ochain can be NULL due to gaps
 922          *       in the cluster arrays.
 923          */
 924         hammer2_spin_ex(&ip->cluster_spin);
 925         for (i = 0; cluster && i < cluster->nchains; ++i) {
 926                 /*
 927                  * Do not replace elements which are the same.  Also handle
 928                  * element count discrepancies.
 929                  */
 930                 nchain = cluster->array[i].chain;
 931                 if (i < ip->cluster.nchains) {
 932                         ochain = ip->cluster.array[i].chain;
 933                         if (ochain == nchain)
 934                                 continue;
 935                 } else {
 936                         ochain = NULL;
 937                 }
 938
 939                 /*
 940                  * Make adjustments
 941                  */
 942                 ip->cluster.array[i].chain = nchain;
 943                 ip->cluster.array[i].flags &= ~HAMMER2_CITEM_INVALID;
 944                 ip->cluster.array[i].flags |= cluster->array[i].flags &
 945                                               HAMMER2_CITEM_INVALID;
 946                 if (nchain)
 947                         hammer2_chain_ref(nchain);
 948                 dropch[i] = ochain;
 949         }
 950
 951         /*
 952          * Release any left-over chains in ip->cluster.
 953          */
 954         while (i < ip->cluster.nchains) {
 955                 nchain = ip->cluster.array[i].chain;
 956                 if (nchain) {
 957                         ip->cluster.array[i].chain = NULL;
 958                         ip->cluster.array[i].flags |= HAMMER2_CITEM_INVALID;
 959                 }
 960                 dropch[i] = nchain;
 961                 ++i;
 962         }
 963
 964         /*
 965          * Fixup fields.  Note that the inode-embedded cluster is never
 966          * directly locked.
 967          */
 968         if (cluster) {
 969                 ip->cluster.nchains = cluster->nchains;
 970                 ip->cluster.focus = cluster->focus;
 971                 ip->cluster.flags = cluster->flags & ~HAMMER2_CLUSTER_LOCKED;
 972         } else {
 973                 ip->cluster.nchains = 0;
 974                 ip->cluster.focus = NULL;
 975                 ip->cluster.flags &= ~HAMMER2_CLUSTER_ZFLAGS;
 976         }
 977
 978         hammer2_spin_unex(&ip->cluster_spin);
 979
 980         /*
 981          * Cleanup outside of spinlock
 982          */
 983         while (--i >= 0) {
 984                 if (dropch[i])
 985                         hammer2_chain_drop(dropch[i]);
 986         }
 987 }
 988
 989 /*
 990  * Repoint a single element from the cluster to the ip.  Used by the
 991  * synchronization threads to piecemeal update inodes.  Does not change
 992  * focus and requires inode to be re-locked to clean-up flags (XXX).
 993  */
 994 void
 995 hammer2_inode_repoint_one(hammer2_inode_t *ip, hammer2_cluster_t *cluster,
 996                           int idx)
 997 {
 998         hammer2_chain_t *ochain;
 999         hammer2_chain_t *nchain;
1000         int i;
1001
1002         hammer2_spin_ex(&ip->cluster_spin);
1003         KKASSERT(idx < cluster->nchains);
1004         if (idx < ip->cluster.nchains) {
1005                 ochain = ip->cluster.array[idx].chain;
1006                 nchain = cluster->array[idx].chain;
1007         } else {
1008                 ochain = NULL;
1009                 nchain = cluster->array[idx].chain;
1010                 ip->cluster.nchains = idx + 1;
1011                 for (i = ip->cluster.nchains; i <= idx; ++i) {
1012                         bzero(&ip->cluster.array[i],
1013                               sizeof(ip->cluster.array[i]));
1014                         ip->cluster.array[i].flags |= HAMMER2_CITEM_INVALID;
1015                 }
1016         }
1017         if (ochain != nchain) {
1018                 /*
1019                  * Make adjustments.
1020                  */
1021                 ip->cluster.array[idx].chain = nchain;
1022                 ip->cluster.array[idx].flags &= ~HAMMER2_CITEM_INVALID;
1023                 ip->cluster.array[idx].flags |= cluster->array[idx].flags &
1024                                                 HAMMER2_CITEM_INVALID;
1025         }
1026         hammer2_spin_unex(&ip->cluster_spin);
1027         if (ochain != nchain) {
1028                 if (nchain)
1029                         hammer2_chain_ref(nchain);
1030                 if (ochain)
1031                         hammer2_chain_drop(ochain);
1032         }
1033 }
1034
1035 /*
1036  * Called with a locked inode to finish unlinking an inode after xop_unlink
1037  * had been run.  This function is responsible for decrementing nlinks.
1038  *
1039  * We don't bother decrementing nlinks if the file is not open and this was
1040  * the last link.
1041  *
1042  * If the inode is a hardlink target it's chain has not yet been deleted,
1043  * otherwise it's chain has been deleted.
1044  *
1045  * If isopen then any prior deletion was not permanent and the inode is
1046  * left intact with nlinks == 0;
1047  */
1048 int
1049 hammer2_inode_unlink_finisher(hammer2_inode_t *ip, int isopen)
1050 {
1051         hammer2_pfs_t *pmp;
1052         int error;
1053
1054         pmp = ip->pmp;
1055
1056         /*
1057          * Decrement nlinks.  If this is the last link and the file is
1058          * not open we can just delete the inode and not bother dropping
1059          * nlinks to 0 (avoiding unnecessary block updates).
1060          */
1061         if (ip->meta.nlinks == 1) {
1062                 atomic_set_int(&ip->flags, HAMMER2_INODE_ISUNLINKED);
1063                 if (isopen == 0)
1064                         goto killit;
1065         }
1066
1067         hammer2_inode_modify(ip);
1068         --ip->meta.nlinks;
1069         if ((int64_t)ip->meta.nlinks < 0)
1070                 ip->meta.nlinks = 0;    /* safety */
1071
1072         /*
1073          * If nlinks is not zero we are done.  However, this should only be
1074          * possible with a hardlink target.  If the inode is an embedded
1075          * hardlink nlinks should have dropped to zero, warn and proceed
1076          * with the next step.
1077          */
1078         if (ip->meta.nlinks) {
1079                 if ((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0)
1080                         return 0;
1081                 kprintf("hammer2_inode_unlink: nlinks was not 0 (%jd)\n",
1082                         (intmax_t)ip->meta.nlinks);
1083                 return 0;
1084         }
1085
1086         /*
1087          * nlinks is now zero, delete the inode if not open.
1088          */
1089         if (isopen == 0) {
1090                 hammer2_xop_destroy_t *xop;
1091
1092 killit:
1093                 atomic_set_int(&ip->flags, HAMMER2_INODE_ISDELETED);
1094                 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING);
1095                 hammer2_xop_start(&xop->head, hammer2_inode_xop_destroy);
1096                 error = hammer2_xop_collect(&xop->head, 0);
1097                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1098         }
1099         error = 0;
1100         return error;
1101 }
1102
1103 /*
1104  * Mark an inode as being modified, meaning that the caller will modify
1105  * ip->meta.
1106  *
1107  * If a vnode is present we set the vnode dirty and the nominal filesystem
1108  * sync will also handle synchronizing the inode meta-data.  If no vnode
1109  * is present we must ensure that the inode is on pmp->sideq.
1110  *
1111  * NOTE: No mtid (modify_tid) is passed into this routine.  The caller is
1112  *       only modifying the in-memory inode.  A modify_tid is synchronized
1113  *       later when the inode gets flushed.
1114  */
1115 void
1116 hammer2_inode_modify(hammer2_inode_t *ip)
1117 {
1118         hammer2_pfs_t *pmp;
1119
1120         atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1121         if (ip->vp) {
1122                 vsetisdirty(ip->vp);
1123         } else if ((pmp = ip->pmp) != NULL) {
1124                 hammer2_inode_delayed_sideq(ip);
1125         }
1126 }
1127
1128 /*
1129  * Synchronize the inode's frontend state with the chain state prior
1130  * to any explicit flush of the inode or any strategy write call.
1131  *
1132  * Called with a locked inode inside a transaction.
1133  */
1134 void
1135 hammer2_inode_chain_sync(hammer2_inode_t *ip)
1136 {
1137         if (ip->flags & (HAMMER2_INODE_RESIZED | HAMMER2_INODE_MODIFIED)) {
1138                 hammer2_xop_fsync_t *xop;
1139                 int error;
1140
1141                 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING);
1142                 xop->clear_directdata = 0;
1143                 if (ip->flags & HAMMER2_INODE_RESIZED) {
1144                         if ((ip->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) &&
1145                             ip->meta.size > HAMMER2_EMBEDDED_BYTES) {
1146                                 ip->meta.op_flags &= ~HAMMER2_OPFLAG_DIRECTDATA;
1147                                 xop->clear_directdata = 1;
1148                         }
1149                         xop->osize = ip->osize;
1150                 } else {
1151                         xop->osize = ip->meta.size;     /* safety */
1152                 }
1153                 xop->ipflags = ip->flags;
1154                 xop->meta = ip->meta;
1155
1156                 atomic_clear_int(&ip->flags, HAMMER2_INODE_RESIZED |
1157                                              HAMMER2_INODE_MODIFIED);
1158                 hammer2_xop_start(&xop->head, hammer2_inode_xop_chain_sync);
1159                 error = hammer2_xop_collect(&xop->head, 0);
1160                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1161                 if (error == ENOENT)
1162                         error = 0;
1163                 if (error) {
1164                         kprintf("hammer2: unable to fsync inode %p\n", ip);
1165                         /*
1166                         atomic_set_int(&ip->flags,
1167                                        xop->ipflags & (HAMMER2_INODE_RESIZED |
1168                                                        HAMMER2_INODE_MODIFIED));
1169                         */
1170                         /* XXX return error somehow? */
1171                 }
1172         }
1173 }
1174
1175 /*
1176  * The normal filesystem sync no longer has visibility to an inode structure
1177  * after its vnode has been reclaimed.  In this situation an unlinked-but-open
1178  * inode or a dirty inode may require additional processing to synchronize
1179  * ip->meta to its underlying cluster nodes.
1180  *
1181  * In particular, reclaims can occur in almost any state (for example, when
1182  * doing operations on unrelated vnodes) and flushing the reclaimed inode
1183  * in the reclaim path itself is a non-starter.
1184  *
1185  * Caller must be in a transaction.
1186  */
1187 void
1188 hammer2_inode_run_sideq(hammer2_pfs_t *pmp)
1189 {
1190         hammer2_xop_destroy_t *xop;
1191         hammer2_inode_sideq_t *ipul;
1192         hammer2_inode_t *ip;
1193         int error;
1194
1195         if (TAILQ_EMPTY(&pmp->sideq))
1196                 return;
1197
1198         LOCKSTART;
1199         hammer2_spin_ex(&pmp->list_spin);
1200         while ((ipul = TAILQ_FIRST(&pmp->sideq)) != NULL) {
1201                 TAILQ_REMOVE(&pmp->sideq, ipul, entry);
1202                 ip = ipul->ip;
1203                 KKASSERT(ip->flags & HAMMER2_INODE_ONSIDEQ);
1204                 atomic_clear_int(&ip->flags, HAMMER2_INODE_ONSIDEQ);
1205                 hammer2_spin_unex(&pmp->list_spin);
1206                 kfree(ipul, pmp->minode);
1207
1208                 hammer2_inode_lock(ip, 0);
1209                 if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
1210                         /*
1211                          * The inode was unlinked while open.  The inode must
1212                          * be deleted and destroyed.
1213                          */
1214                         xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING);
1215                         hammer2_xop_start(&xop->head,
1216                                           hammer2_inode_xop_destroy);
1217                         error = hammer2_xop_collect(&xop->head, 0);
1218                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1219                 } else {
1220                         /*
1221                          * The inode was dirty as-of the reclaim, requiring
1222                          * synchronization of ip->meta with its underlying
1223                          * chains.
1224                          */
1225                         hammer2_inode_chain_sync(ip);
1226                 }
1227
1228                 hammer2_inode_unlock(ip);
1229                 hammer2_inode_drop(ip);                 /* ipul ref */
1230
1231                 hammer2_spin_ex(&pmp->list_spin);
1232         }
1233         hammer2_spin_unex(&pmp->list_spin);
1234         LOCKSTOP;
1235 }
1236
1237 /*
1238  * Inode create helper (threaded, backend)
1239  *
1240  * Used by ncreate, nmknod, nsymlink, nmkdir.
1241  * Used by nlink and rename to create HARDLINK pointers.
1242  *
1243  * Frontend holds the parent directory ip locked exclusively.  We
1244  * create the inode and feed the exclusively locked chain to the
1245  * frontend.
1246  */
1247 void
1248 hammer2_inode_xop_create(hammer2_xop_t *arg, int clindex)
1249 {
1250         hammer2_xop_create_t *xop = &arg->xop_create;
1251         hammer2_chain_t *parent;
1252         hammer2_chain_t *chain;
1253         hammer2_key_t key_next;
1254         int cache_index = -1;
1255         int error;
1256
1257         if (hammer2_debug & 0x0001)
1258                 kprintf("inode_create lhc %016jx clindex %d\n",
1259                         xop->lhc, clindex);
1260
1261         parent = hammer2_inode_chain(xop->head.ip1, clindex,
1262                                      HAMMER2_RESOLVE_ALWAYS);
1263         if (parent == NULL) {
1264                 error = EIO;
1265                 chain = NULL;
1266                 goto fail;
1267         }
1268         chain = hammer2_chain_lookup(&parent, &key_next,
1269                                      xop->lhc, xop->lhc,
1270                                      &cache_index, 0);
1271         if (chain) {
1272                 error = EEXIST;
1273                 goto fail;
1274         }
1275
1276         error = hammer2_chain_create(&parent, &chain,
1277                                      xop->head.ip1->pmp, HAMMER2_METH_DEFAULT,
1278                                      xop->lhc, 0,
1279                                      HAMMER2_BREF_TYPE_INODE,
1280                                      HAMMER2_INODE_BYTES,
1281                                      xop->head.mtid, 0, xop->flags);
1282         if (error == 0) {
1283                 hammer2_chain_modify(chain, xop->head.mtid, 0, 0);
1284                 chain->data->ipdata.meta = xop->meta;
1285                 if (xop->head.name1) {
1286                         bcopy(xop->head.name1,
1287                               chain->data->ipdata.filename,
1288                               xop->head.name1_len);
1289                         chain->data->ipdata.meta.name_len = xop->head.name1_len;
1290                 }
1291                 chain->data->ipdata.meta.name_key = xop->lhc;
1292         }
1293 fail:
1294         if (parent) {
1295                 hammer2_chain_unlock(parent);
1296                 hammer2_chain_drop(parent);
1297         }
1298         hammer2_xop_feed(&xop->head, chain, clindex, error);
1299         if (chain) {
1300                 hammer2_chain_unlock(chain);
1301                 hammer2_chain_drop(chain);
1302         }
1303 }
1304
1305 /*
1306  * Inode delete helper (backend, threaded)
1307  *
1308  * Generally used by hammer2_run_sideq()
1309  */
1310 void
1311 hammer2_inode_xop_destroy(hammer2_xop_t *arg, int clindex)
1312 {
1313         hammer2_xop_destroy_t *xop = &arg->xop_destroy;
1314         hammer2_pfs_t *pmp;
1315         hammer2_chain_t *parent;
1316         hammer2_chain_t *chain;
1317         hammer2_inode_t *ip;
1318         int error;
1319
1320         /*
1321          * We need the precise parent chain to issue the deletion.
1322          */
1323         ip = xop->head.ip1;
1324         pmp = ip->pmp;
1325         chain = NULL;
1326
1327 again:
1328         parent = hammer2_inode_chain(ip, clindex, HAMMER2_RESOLVE_ALWAYS);
1329         if (parent)
1330                 hammer2_chain_getparent(&parent, HAMMER2_RESOLVE_ALWAYS);
1331         if (parent == NULL) {
1332                 error = EIO;
1333                 goto done;
1334         }
1335         chain = hammer2_inode_chain(ip, clindex, HAMMER2_RESOLVE_ALWAYS);
1336         if (chain == NULL) {
1337                 error = EIO;
1338                 goto done;
1339         }
1340         if (chain->parent != parent) {
1341                 kprintf("hammer2_inode_xop_destroy: "
1342                         "parent changed %p->(%p,%p)\n",
1343                         chain, parent, chain->parent);
1344                 hammer2_chain_unlock(parent);
1345                 hammer2_chain_drop(parent);
1346                 hammer2_chain_unlock(chain);
1347                 hammer2_chain_drop(chain);
1348                 goto again;
1349         }
1350
1351         hammer2_chain_delete(parent, chain, xop->head.mtid, 0);
1352         error = 0;
1353 done:
1354         hammer2_xop_feed(&xop->head, NULL, clindex, error);
1355         if (parent) {
1356                 hammer2_chain_unlock(parent);
1357                 hammer2_chain_drop(parent);
1358         }
1359         if (chain) {
1360                 hammer2_chain_unlock(chain);
1361                 hammer2_chain_drop(chain);
1362         }
1363 }
1364
1365 void
1366 hammer2_inode_xop_unlinkall(hammer2_xop_t *arg, int clindex)
1367 {
1368         hammer2_xop_unlinkall_t *xop = &arg->xop_unlinkall;
1369         hammer2_chain_t *parent;
1370         hammer2_chain_t *chain;
1371         hammer2_key_t key_next;
1372         int cache_index = -1;
1373
1374         /*
1375          * We need the precise parent chain to issue the deletion.
1376          */
1377         parent = hammer2_inode_chain(xop->head.ip1, clindex,
1378                                      HAMMER2_RESOLVE_ALWAYS);
1379         chain = NULL;
1380         if (parent == NULL) {
1381                 /* XXX error */
1382                 goto done;
1383         }
1384         chain = hammer2_chain_lookup(&parent, &key_next,
1385                                      xop->key_beg, xop->key_end,
1386                                      &cache_index,
1387                                      HAMMER2_LOOKUP_ALWAYS);
1388         while (chain) {
1389                 hammer2_chain_delete(parent, chain,
1390                                      xop->head.mtid, HAMMER2_DELETE_PERMANENT);
1391                 hammer2_xop_feed(&xop->head, chain, clindex, chain->error);
1392                 /* depend on function to unlock the shared lock */
1393                 chain = hammer2_chain_next(&parent, chain, &key_next,
1394                                            key_next, xop->key_end,
1395                                            &cache_index,
1396                                            HAMMER2_LOOKUP_ALWAYS);
1397         }
1398 done:
1399         hammer2_xop_feed(&xop->head, NULL, clindex, ENOENT);
1400         if (parent) {
1401                 hammer2_chain_unlock(parent);
1402                 hammer2_chain_drop(parent);
1403         }
1404         if (chain) {
1405                 hammer2_chain_unlock(chain);
1406                 hammer2_chain_drop(chain);
1407         }
1408 }
1409
1410 void
1411 hammer2_inode_xop_connect(hammer2_xop_t *arg, int clindex)
1412 {
1413         hammer2_xop_connect_t *xop = &arg->xop_connect;
1414         hammer2_inode_data_t *wipdata;
1415         hammer2_chain_t *parent;
1416         hammer2_chain_t *chain;
1417         hammer2_pfs_t *pmp;
1418         hammer2_key_t key_dummy;
1419         int cache_index = -1;
1420         int error;
1421
1422         /*
1423          * Get directory, then issue a lookup to prime the parent chain
1424          * for the create.  The lookup is expected to fail.
1425          */
1426         pmp = xop->head.ip1->pmp;
1427         parent = hammer2_inode_chain(xop->head.ip1, clindex,
1428                                      HAMMER2_RESOLVE_ALWAYS);
1429         if (parent == NULL) {
1430                 chain = NULL;
1431                 error = EIO;
1432                 goto fail;
1433         }
1434         chain = hammer2_chain_lookup(&parent, &key_dummy,
1435                                      xop->lhc, xop->lhc,
1436                                      &cache_index, 0);
1437         if (chain) {
1438                 hammer2_chain_unlock(chain);
1439                 hammer2_chain_drop(chain);
1440                 chain = NULL;
1441                 error = EEXIST;
1442                 goto fail;
1443         }
1444
1445         /*
1446          * Adjust the filename in the inode, set the name key.
1447          *
1448          * NOTE: Frontend must also adjust ip2->meta on success, we can't
1449          *       do it here.
1450          */
1451         chain = hammer2_inode_chain(xop->head.ip2, clindex,
1452                                     HAMMER2_RESOLVE_ALWAYS);
1453         hammer2_chain_modify(chain, xop->head.mtid, 0, 0);
1454         wipdata = &chain->data->ipdata;
1455
1456         hammer2_inode_modify(xop->head.ip2);
1457         if (xop->head.name1) {
1458                 bzero(wipdata->filename, sizeof(wipdata->filename));
1459                 bcopy(xop->head.name1, wipdata->filename, xop->head.name1_len);
1460                 wipdata->meta.name_len = xop->head.name1_len;
1461         }
1462         wipdata->meta.name_key = xop->lhc;
1463
1464         /*
1465          * Reconnect the chain to the new parent directory
1466          */
1467         error = hammer2_chain_create(&parent, &chain,
1468                                      pmp, HAMMER2_METH_DEFAULT,
1469                                      xop->lhc, 0,
1470                                      HAMMER2_BREF_TYPE_INODE,
1471                                      HAMMER2_INODE_BYTES,
1472                                      xop->head.mtid, 0, 0);
1473
1474         /*
1475          * Feed result back.
1476          */
1477 fail:
1478         hammer2_xop_feed(&xop->head, NULL, clindex, error);
1479         if (parent) {
1480                 hammer2_chain_unlock(parent);
1481                 hammer2_chain_drop(parent);
1482         }
1483         if (chain) {
1484                 hammer2_chain_unlock(chain);
1485                 hammer2_chain_drop(chain);
1486         }
1487 }
1488
1489 /*
1490  * Synchronize the in-memory inode with the chain.
1491  */
1492 void
1493 hammer2_inode_xop_chain_sync(hammer2_xop_t *arg, int clindex)
1494 {
1495         hammer2_xop_fsync_t *xop = &arg->xop_fsync;
1496         hammer2_chain_t *parent;
1497         hammer2_chain_t *chain;
1498         int error;
1499
1500         parent = hammer2_inode_chain(xop->head.ip1, clindex,
1501                                      HAMMER2_RESOLVE_ALWAYS);
1502         chain = NULL;
1503         if (parent == NULL) {
1504                 error = EIO;
1505                 goto done;
1506         }
1507         if (parent->error) {
1508                 error = parent->error;
1509                 goto done;
1510         }
1511
1512         error = 0;
1513
1514         if ((xop->ipflags & HAMMER2_INODE_RESIZED) == 0) {
1515                 /* osize must be ignored */
1516         } else if (xop->meta.size < xop->osize) {
1517                 /*
1518                  * We must delete any chains beyond the EOF.  The chain
1519                  * straddling the EOF will be pending in the bioq.
1520                  */
1521                 hammer2_key_t lbase;
1522                 hammer2_key_t key_next;
1523                 int cache_index = -1;
1524
1525                 lbase = (xop->meta.size + HAMMER2_PBUFMASK64) &
1526                         ~HAMMER2_PBUFMASK64;
1527                 chain = hammer2_chain_lookup(&parent, &key_next,
1528                                              lbase, HAMMER2_KEY_MAX,
1529                                              &cache_index,
1530                                              HAMMER2_LOOKUP_NODATA |
1531                                              HAMMER2_LOOKUP_NODIRECT);
1532                 while (chain) {
1533                         /*
1534                          * Degenerate embedded case, nothing to loop on
1535                          */
1536                         switch (chain->bref.type) {
1537                         case HAMMER2_BREF_TYPE_INODE:
1538                                 KKASSERT(0);
1539                                 break;
1540                         case HAMMER2_BREF_TYPE_DATA:
1541                                 hammer2_chain_delete(parent, chain,
1542                                                      xop->head.mtid,
1543                                                      HAMMER2_DELETE_PERMANENT);
1544                                 break;
1545                         }
1546                         chain = hammer2_chain_next(&parent, chain, &key_next,
1547                                                    key_next, HAMMER2_KEY_MAX,
1548                                                    &cache_index,
1549                                                    HAMMER2_LOOKUP_NODATA |
1550                                                    HAMMER2_LOOKUP_NODIRECT);
1551                 }
1552
1553                 /*
1554                  * Reset to point at inode for following code, if necessary.
1555                  */
1556                 if (parent->bref.type != HAMMER2_BREF_TYPE_INODE) {
1557                         hammer2_chain_unlock(parent);
1558                         hammer2_chain_drop(parent);
1559                         parent = hammer2_inode_chain(xop->head.ip1, clindex,
1560                                                      HAMMER2_RESOLVE_ALWAYS);
1561                         kprintf("hammer2: TRUNCATE RESET on '%s'\n",
1562                                 parent->data->ipdata.filename);
1563                 }
1564         }
1565
1566         /*
1567          * Sync the inode meta-data, potentially clear the blockset area
1568          * of direct data so it can be used for blockrefs.
1569          */
1570         hammer2_chain_modify(parent, xop->head.mtid, 0, 0);
1571         parent->data->ipdata.meta = xop->meta;
1572         if (xop->clear_directdata) {
1573                 bzero(&parent->data->ipdata.u.blockset,
1574                       sizeof(parent->data->ipdata.u.blockset));
1575         }
1576 done:
1577         if (chain) {
1578                 hammer2_chain_unlock(chain);
1579                 hammer2_chain_drop(chain);
1580         }
1581         if (parent) {
1582                 hammer2_chain_unlock(parent);
1583                 hammer2_chain_drop(parent);
1584         }
1585         hammer2_xop_feed(&xop->head, NULL, clindex, error);
1586 }
1587