sys/vfs/hammer/hammer_inode.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.67 2008/06/09 04:19:10 dillon Exp $
  35  */
  36
  37 #include "hammer.h"
  38 #include <vm/vm_extern.h>
  39 #include <sys/buf.h>
  40 #include <sys/buf2.h>
  41
  42 static int hammer_unload_inode(struct hammer_inode *ip);
  43 static void hammer_flush_inode_core(hammer_inode_t ip, int flags);
  44 static int hammer_setup_child_callback(hammer_record_t rec, void *data);
  45 static int hammer_setup_parent_inodes(hammer_record_t record);
  46
  47 #ifdef DEBUG_TRUNCATE
  48 extern struct hammer_inode *HammerTruncIp;
  49 #endif
  50
  51 /*
  52  * The kernel is not actively referencing this vnode but is still holding
  53  * it cached.
  54  *
  55  * This is called from the frontend.
  56  */
  57 int
  58 hammer_vop_inactive(struct vop_inactive_args *ap)
  59 {
  60         struct hammer_inode *ip = VTOI(ap->a_vp);
  61
  62         /*
  63          * Degenerate case
  64          */
  65         if (ip == NULL) {
  66                 vrecycle(ap->a_vp);
  67                 return(0);
  68         }
  69
  70         /*
  71          * If the inode no longer has visibility in the filesystem and is
  72          * fairly clean, try to recycle it immediately.  This can deadlock
  73          * in vfsync() if we aren't careful.
  74          *
  75          * Do not queue the inode to the flusher if we still have visibility,
  76          * otherwise namespace calls such as chmod will unnecessarily generate
  77          * multiple inode updates.
  78          */
  79         hammer_inode_unloadable_check(ip, 0);
  80         if (ip->ino_data.nlinks == 0) {
  81                 if (ip->flags & HAMMER_INODE_MODMASK)
  82                         hammer_flush_inode(ip, 0);
  83                 else
  84                         vrecycle(ap->a_vp);
  85         }
  86         return(0);
  87 }
  88
  89 /*
  90  * Release the vnode association.  This is typically (but not always)
  91  * the last reference on the inode.
  92  *
  93  * Once the association is lost we are on our own with regards to
  94  * flushing the inode.
  95  */
  96 int
  97 hammer_vop_reclaim(struct vop_reclaim_args *ap)
  98 {
  99         struct hammer_inode *ip;
 100         struct vnode *vp;
 101
 102         vp = ap->a_vp;
 103
 104         if ((ip = vp->v_data) != NULL) {
 105                 vp->v_data = NULL;
 106                 ip->vp = NULL;
 107                 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) {
 108                         ++hammer_count_reclaiming;
 109                         ++ip->hmp->inode_reclaims;
 110                         ip->flags |= HAMMER_INODE_RECLAIM;
 111                 }
 112                 hammer_rel_inode(ip, 1);
 113         }
 114         return(0);
 115 }
 116
 117 /*
 118  * Return a locked vnode for the specified inode.  The inode must be
 119  * referenced but NOT LOCKED on entry and will remain referenced on
 120  * return.
 121  *
 122  * Called from the frontend.
 123  */
 124 int
 125 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp)
 126 {
 127         hammer_mount_t hmp;
 128         struct vnode *vp;
 129         int error = 0;
 130
 131         hmp = ip->hmp;
 132
 133         for (;;) {
 134                 if ((vp = ip->vp) == NULL) {
 135                         error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0);
 136                         if (error)
 137                                 break;
 138                         hammer_lock_ex(&ip->lock);
 139                         if (ip->vp != NULL) {
 140                                 hammer_unlock(&ip->lock);
 141                                 vp->v_type = VBAD;
 142                                 vx_put(vp);
 143                                 continue;
 144                         }
 145                         hammer_ref(&ip->lock);
 146                         vp = *vpp;
 147                         ip->vp = vp;
 148                         vp->v_type =
 149                                 hammer_get_vnode_type(ip->ino_data.obj_type);
 150
 151                         if (ip->flags & HAMMER_INODE_RECLAIM) {
 152                                 --hammer_count_reclaiming;
 153                                 --hmp->inode_reclaims;
 154                                 ip->flags &= ~HAMMER_INODE_RECLAIM;
 155                                 if (hmp->flags & HAMMER_MOUNT_WAITIMAX)
 156                                         hammer_inode_wakereclaims(hmp);
 157                         }
 158
 159                         switch(ip->ino_data.obj_type) {
 160                         case HAMMER_OBJTYPE_CDEV:
 161                         case HAMMER_OBJTYPE_BDEV:
 162                                 vp->v_ops = &hmp->mp->mnt_vn_spec_ops;
 163                                 addaliasu(vp, ip->ino_data.rmajor,
 164                                           ip->ino_data.rminor);
 165                                 break;
 166                         case HAMMER_OBJTYPE_FIFO:
 167                                 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops;
 168                                 break;
 169                         default:
 170                                 break;
 171                         }
 172
 173                         /*
 174                          * Only mark as the root vnode if the ip is not
 175                          * historical, otherwise the VFS cache will get
 176                          * confused.  The other half of the special handling
 177                          * is in hammer_vop_nlookupdotdot().
 178                          */
 179                         if (ip->obj_id == HAMMER_OBJID_ROOT &&
 180                             ip->obj_asof == hmp->asof) {
 181                                 vp->v_flag |= VROOT;
 182                         }
 183
 184                         vp->v_data = (void *)ip;
 185                         /* vnode locked by getnewvnode() */
 186                         /* make related vnode dirty if inode dirty? */
 187                         hammer_unlock(&ip->lock);
 188                         if (vp->v_type == VREG)
 189                                 vinitvmio(vp, ip->ino_data.size);
 190                         break;
 191                 }
 192
 193                 /*
 194                  * loop if the vget fails (aka races), or if the vp
 195                  * no longer matches ip->vp.
 196                  */
 197                 if (vget(vp, LK_EXCLUSIVE) == 0) {
 198                         if (vp == ip->vp)
 199                                 break;
 200                         vput(vp);
 201                 }
 202         }
 203         *vpp = vp;
 204         return(error);
 205 }
 206
 207 /*
 208  * Acquire a HAMMER inode.  The returned inode is not locked.  These functions
 209  * do not attach or detach the related vnode (use hammer_get_vnode() for
 210  * that).
 211  *
 212  * The flags argument is only applied for newly created inodes, and only
 213  * certain flags are inherited.
 214  *
 215  * Called from the frontend.
 216  */
 217 struct hammer_inode *
 218 hammer_get_inode(hammer_transaction_t trans, struct hammer_node **cache,
 219                  u_int64_t obj_id, hammer_tid_t asof, int flags, int *errorp)
 220 {
 221         hammer_mount_t hmp = trans->hmp;
 222         struct hammer_inode_info iinfo;
 223         struct hammer_cursor cursor;
 224         struct hammer_inode *ip;
 225
 226         /*
 227          * Determine if we already have an inode cached.  If we do then
 228          * we are golden.
 229          */
 230         iinfo.obj_id = obj_id;
 231         iinfo.obj_asof = asof;
 232 loop:
 233         ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
 234         if (ip) {
 235                 hammer_ref(&ip->lock);
 236                 *errorp = 0;
 237                 return(ip);
 238         }
 239
 240         ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
 241         ++hammer_count_inodes;
 242         ++hmp->count_inodes;
 243         ip->obj_id = obj_id;
 244         ip->obj_asof = iinfo.obj_asof;
 245         ip->hmp = hmp;
 246         ip->flags = flags & HAMMER_INODE_RO;
 247         if (hmp->ronly)
 248                 ip->flags |= HAMMER_INODE_RO;
 249         ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
 250         RB_INIT(&ip->rec_tree);
 251         TAILQ_INIT(&ip->target_list);
 252
 253         /*
 254          * Locate the on-disk inode.
 255          */
 256 retry:
 257         hammer_init_cursor(trans, &cursor, cache, NULL);
 258         cursor.key_beg.localization = HAMMER_LOCALIZE_INODE;
 259         cursor.key_beg.obj_id = ip->obj_id;
 260         cursor.key_beg.key = 0;
 261         cursor.key_beg.create_tid = 0;
 262         cursor.key_beg.delete_tid = 0;
 263         cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
 264         cursor.key_beg.obj_type = 0;
 265         cursor.asof = iinfo.obj_asof;
 266         cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA |
 267                        HAMMER_CURSOR_ASOF;
 268
 269         *errorp = hammer_btree_lookup(&cursor);
 270         if (*errorp == EDEADLK) {
 271                 hammer_done_cursor(&cursor);
 272                 goto retry;
 273         }
 274
 275         /*
 276          * On success the B-Tree lookup will hold the appropriate
 277          * buffer cache buffers and provide a pointer to the requested
 278          * information.  Copy the information to the in-memory inode
 279          * and cache the B-Tree node to improve future operations.
 280          */
 281         if (*errorp == 0) {
 282                 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
 283                 ip->ino_data = cursor.data->inode;
 284                 hammer_cache_node(cursor.node, &ip->cache[0]);
 285                 if (cache)
 286                         hammer_cache_node(cursor.node, cache);
 287         }
 288
 289         /*
 290          * On success load the inode's record and data and insert the
 291          * inode into the B-Tree.  It is possible to race another lookup
 292          * insertion of the same inode so deal with that condition too.
 293          *
 294          * The cursor's locked node interlocks against others creating and
 295          * destroying ip while we were blocked.
 296          */
 297         if (*errorp == 0) {
 298                 hammer_ref(&ip->lock);
 299                 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
 300                         hammer_uncache_node(&ip->cache[0]);
 301                         hammer_uncache_node(&ip->cache[1]);
 302                         KKASSERT(ip->lock.refs == 1);
 303                         --hammer_count_inodes;
 304                         --hmp->count_inodes;
 305                         kfree(ip, M_HAMMER);
 306                         hammer_done_cursor(&cursor);
 307                         goto loop;
 308                 }
 309                 ip->flags |= HAMMER_INODE_ONDISK;
 310         } else {
 311                 /*
 312                  * Do not panic on read-only accesses which fail, particularly
 313                  * historical accesses where the snapshot might not have
 314                  * complete connectivity.
 315                  */
 316                 if ((flags & HAMMER_INODE_RO) == 0) {
 317                         kprintf("hammer_get_inode: failed ip %p obj_id %016llx cursor %p error %d\n",
 318                                 ip, ip->obj_id, &cursor, *errorp);
 319                         Debugger("x");
 320                 }
 321                 if (ip->flags & HAMMER_INODE_RSV_INODES) {
 322                         ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
 323                         --hmp->rsv_inodes;
 324                 }
 325                 hmp->rsv_databufs -= ip->rsv_databufs;
 326                 ip->rsv_databufs = 0;                          /* sanity */
 327
 328                 --hammer_count_inodes;
 329                 --hmp->count_inodes;
 330                 kfree(ip, M_HAMMER);
 331                 ip = NULL;
 332         }
 333         hammer_done_cursor(&cursor);
 334         return (ip);
 335 }
 336
 337 /*
 338  * Create a new filesystem object, returning the inode in *ipp.  The
 339  * returned inode will be referenced.
 340  *
 341  * The inode is created in-memory.
 342  */
 343 int
 344 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
 345                     struct ucred *cred, hammer_inode_t dip,
 346                     struct hammer_inode **ipp)
 347 {
 348         hammer_mount_t hmp;
 349         hammer_inode_t ip;
 350         uid_t xuid;
 351
 352         hmp = trans->hmp;
 353         ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
 354         ++hammer_count_inodes;
 355         ++hmp->count_inodes;
 356         ip->obj_id = hammer_alloc_objid(trans, dip);
 357         KKASSERT(ip->obj_id != 0);
 358         ip->obj_asof = hmp->asof;
 359         ip->hmp = hmp;
 360         ip->flush_state = HAMMER_FST_IDLE;
 361         ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES;
 362
 363         ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
 364         RB_INIT(&ip->rec_tree);
 365         TAILQ_INIT(&ip->target_list);
 366
 367         ip->ino_leaf.atime = trans->time;
 368         ip->ino_data.mtime = trans->time;
 369         ip->ino_data.size = 0;
 370         ip->ino_data.nlinks = 0;
 371
 372         /*
 373          * A nohistory designator on the parent directory is inherited by
 374          * the child.
 375          */
 376         ip->ino_data.uflags = dip->ino_data.uflags &
 377                               (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
 378
 379         ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
 380         ip->ino_leaf.base.localization = HAMMER_LOCALIZE_INODE;
 381         ip->ino_leaf.base.obj_id = ip->obj_id;
 382         ip->ino_leaf.base.key = 0;
 383         ip->ino_leaf.base.create_tid = 0;
 384         ip->ino_leaf.base.delete_tid = 0;
 385         ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
 386         ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
 387
 388         ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
 389         ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
 390         ip->ino_data.mode = vap->va_mode;
 391         ip->ino_data.ctime = trans->time;
 392         ip->ino_data.parent_obj_id = (dip) ? dip->ino_leaf.base.obj_id : 0;
 393
 394         switch(ip->ino_leaf.base.obj_type) {
 395         case HAMMER_OBJTYPE_CDEV:
 396         case HAMMER_OBJTYPE_BDEV:
 397                 ip->ino_data.rmajor = vap->va_rmajor;
 398                 ip->ino_data.rminor = vap->va_rminor;
 399                 break;
 400         default:
 401                 break;
 402         }
 403
 404         /*
 405          * Calculate default uid/gid and overwrite with information from
 406          * the vap.
 407          */
 408         xuid = hammer_to_unix_xid(&dip->ino_data.uid);
 409         xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred,
 410                                      &vap->va_mode);
 411         ip->ino_data.mode = vap->va_mode;
 412
 413         if (vap->va_vaflags & VA_UID_UUID_VALID)
 414                 ip->ino_data.uid = vap->va_uid_uuid;
 415         else if (vap->va_uid != (uid_t)VNOVAL)
 416                 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
 417         else
 418                 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
 419
 420         if (vap->va_vaflags & VA_GID_UUID_VALID)
 421                 ip->ino_data.gid = vap->va_gid_uuid;
 422         else if (vap->va_gid != (gid_t)VNOVAL)
 423                 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
 424         else
 425                 ip->ino_data.gid = dip->ino_data.gid;
 426
 427         hammer_ref(&ip->lock);
 428         if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
 429                 hammer_unref(&ip->lock);
 430                 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id);
 431         }
 432         *ipp = ip;
 433         return(0);
 434 }
 435
 436 /*
 437  * Called by hammer_sync_inode().
 438  */
 439 static int
 440 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
 441 {
 442         hammer_transaction_t trans = cursor->trans;
 443         hammer_record_t record;
 444         int error;
 445
 446 retry:
 447         error = 0;
 448
 449         /*
 450          * If the inode has a presence on-disk then locate it and mark
 451          * it deleted, setting DELONDISK.
 452          *
 453          * The record may or may not be physically deleted, depending on
 454          * the retention policy.
 455          */
 456         if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
 457             HAMMER_INODE_ONDISK) {
 458                 hammer_normalize_cursor(cursor);
 459                 cursor->key_beg.localization = HAMMER_LOCALIZE_INODE;
 460                 cursor->key_beg.obj_id = ip->obj_id;
 461                 cursor->key_beg.key = 0;
 462                 cursor->key_beg.create_tid = 0;
 463                 cursor->key_beg.delete_tid = 0;
 464                 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
 465                 cursor->key_beg.obj_type = 0;
 466                 cursor->asof = ip->obj_asof;
 467                 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
 468                 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
 469                 cursor->flags |= HAMMER_CURSOR_BACKEND;
 470
 471                 error = hammer_btree_lookup(cursor);
 472                 if (hammer_debug_inode)
 473                         kprintf("IPDEL %p %08x %d", ip, ip->flags, error);
 474                 if (error) {
 475                         kprintf("error %d\n", error);
 476                         Debugger("hammer_update_inode");
 477                 }
 478
 479                 if (error == 0) {
 480                         error = hammer_ip_delete_record(cursor, ip, trans->tid);
 481                         if (hammer_debug_inode)
 482                                 kprintf(" error %d\n", error);
 483                         if (error && error != EDEADLK) {
 484                                 kprintf("error %d\n", error);
 485                                 Debugger("hammer_update_inode2");
 486                         }
 487                         if (error == 0) {
 488                                 ip->flags |= HAMMER_INODE_DELONDISK;
 489                         }
 490                         if (cursor->node)
 491                                 hammer_cache_node(cursor->node, &ip->cache[0]);
 492                 }
 493                 if (error == EDEADLK) {
 494                         hammer_done_cursor(cursor);
 495                         error = hammer_init_cursor(trans, cursor,
 496                                                    &ip->cache[0], ip);
 497                         if (hammer_debug_inode)
 498                                 kprintf("IPDED %p %d\n", ip, error);
 499                         if (error == 0)
 500                                 goto retry;
 501                 }
 502         }
 503
 504         /*
 505          * Ok, write out the initial record or a new record (after deleting
 506          * the old one), unless the DELETED flag is set.  This routine will
 507          * clear DELONDISK if it writes out a record.
 508          *
 509          * Update our inode statistics if this is the first application of
 510          * the inode on-disk.
 511          */
 512         if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
 513                 /*
 514                  * Generate a record and write it to the media
 515                  */
 516                 record = hammer_alloc_mem_record(ip, 0);
 517                 record->type = HAMMER_MEM_RECORD_INODE;
 518                 record->flush_state = HAMMER_FST_FLUSH;
 519                 record->leaf = ip->sync_ino_leaf;
 520                 record->leaf.base.create_tid = trans->tid;
 521                 record->leaf.data_len = sizeof(ip->sync_ino_data);
 522                 record->data = (void *)&ip->sync_ino_data;
 523                 record->flags |= HAMMER_RECF_INTERLOCK_BE;
 524                 for (;;) {
 525                         error = hammer_ip_sync_record_cursor(cursor, record);
 526                         if (hammer_debug_inode)
 527                                 kprintf("GENREC %p rec %08x %d\n",
 528                                         ip, record->flags, error);
 529                         if (error != EDEADLK)
 530                                 break;
 531                         hammer_done_cursor(cursor);
 532                         error = hammer_init_cursor(trans, cursor,
 533                                                    &ip->cache[0], ip);
 534                         if (hammer_debug_inode)
 535                                 kprintf("GENREC reinit %d\n", error);
 536                         if (error)
 537                                 break;
 538                 }
 539                 if (error) {
 540                         kprintf("error %d\n", error);
 541                         Debugger("hammer_update_inode3");
 542                 }
 543
 544                 /*
 545                  * The record isn't managed by the inode's record tree,
 546                  * destroy it whether we succeed or fail.
 547                  */
 548                 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
 549                 record->flags |= HAMMER_RECF_DELETED_FE;
 550                 record->flush_state = HAMMER_FST_IDLE;
 551                 hammer_rel_mem_record(record);
 552
 553                 /*
 554                  * Finish up.
 555                  */
 556                 if (error == 0) {
 557                         if (hammer_debug_inode)
 558                                 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
 559                         ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
 560                                             HAMMER_INODE_ITIMES);
 561                         ip->flags &= ~HAMMER_INODE_DELONDISK;
 562
 563                         /*
 564                          * Root volume count of inodes
 565                          */
 566                         if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
 567                                 hammer_modify_volume_field(trans,
 568                                                            trans->rootvol,
 569                                                            vol0_stat_inodes);
 570                                 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
 571                                 hammer_modify_volume_done(trans->rootvol);
 572                                 ip->flags |= HAMMER_INODE_ONDISK;
 573                                 if (hammer_debug_inode)
 574                                         kprintf("NOWONDISK %p\n", ip);
 575                         }
 576                 }
 577         }
 578
 579         /*
 580          * If the inode has been destroyed, clean out any left-over flags
 581          * that may have been set by the frontend.
 582          */
 583         if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
 584                 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
 585                                     HAMMER_INODE_ITIMES);
 586         }
 587         return(error);
 588 }
 589
 590 /*
 591  * Update only the itimes fields.  This is done no-historically.  The
 592  * record is updated in-place on the disk.
 593  */
 594 static int
 595 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
 596 {
 597         hammer_transaction_t trans = cursor->trans;
 598         struct hammer_btree_leaf_elm *leaf;
 599         int error;
 600
 601 retry:
 602         error = 0;
 603         if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
 604             HAMMER_INODE_ONDISK) {
 605                 hammer_normalize_cursor(cursor);
 606                 cursor->key_beg.localization = HAMMER_LOCALIZE_INODE;
 607                 cursor->key_beg.obj_id = ip->obj_id;
 608                 cursor->key_beg.key = 0;
 609                 cursor->key_beg.create_tid = 0;
 610                 cursor->key_beg.delete_tid = 0;
 611                 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
 612                 cursor->key_beg.obj_type = 0;
 613                 cursor->asof = ip->obj_asof;
 614                 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
 615                 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
 616                 cursor->flags |= HAMMER_CURSOR_BACKEND;
 617
 618                 error = hammer_btree_lookup(cursor);
 619                 if (error) {
 620                         kprintf("error %d\n", error);
 621                         Debugger("hammer_update_itimes1");
 622                 }
 623                 if (error == 0) {
 624                         /*
 625                          * Do not generate UNDO records for atime updates.
 626                          */
 627                         leaf = cursor->leaf;
 628                         hammer_modify_node(trans, cursor->node,
 629                                            &leaf->atime, sizeof(leaf->atime));
 630                         leaf->atime = ip->sync_ino_leaf.atime;
 631                         hammer_modify_node_done(cursor->node);
 632                         /*rec->ino_mtime = ip->sync_ino_rec.ino_mtime;*/
 633                         ip->sync_flags &= ~HAMMER_INODE_ITIMES;
 634                         /* XXX recalculate crc */
 635                         hammer_cache_node(cursor->node, &ip->cache[0]);
 636                 }
 637                 if (error == EDEADLK) {
 638                         hammer_done_cursor(cursor);
 639                         error = hammer_init_cursor(trans, cursor,
 640                                                    &ip->cache[0], ip);
 641                         if (error == 0)
 642                                 goto retry;
 643                 }
 644         }
 645         return(error);
 646 }
 647
 648 /*
 649  * Release a reference on an inode, flush as requested.
 650  *
 651  * On the last reference we queue the inode to the flusher for its final
 652  * disposition.
 653  */
 654 void
 655 hammer_rel_inode(struct hammer_inode *ip, int flush)
 656 {
 657         hammer_mount_t hmp = ip->hmp;
 658
 659         /*
 660          * Handle disposition when dropping the last ref.
 661          */
 662         for (;;) {
 663                 if (ip->lock.refs == 1) {
 664                         /*
 665                          * Determine whether on-disk action is needed for
 666                          * the inode's final disposition.
 667                          */
 668                         KKASSERT(ip->vp == NULL);
 669                         hammer_inode_unloadable_check(ip, 0);
 670                         if (ip->flags & HAMMER_INODE_MODMASK) {
 671                                 if (hmp->rsv_inodes > desiredvnodes) {
 672                                         hammer_flush_inode(ip,
 673                                                            HAMMER_FLUSH_SIGNAL);
 674                                 } else {
 675                                         hammer_flush_inode(ip, 0);
 676                                 }
 677                         } else if (ip->lock.refs == 1) {
 678                                 hammer_unload_inode(ip);
 679                                 break;
 680                         }
 681                 } else {
 682                         if (flush)
 683                                 hammer_flush_inode(ip, 0);
 684
 685                         /*
 686                          * The inode still has multiple refs, try to drop
 687                          * one ref.
 688                          */
 689                         KKASSERT(ip->lock.refs >= 1);
 690                         if (ip->lock.refs > 1) {
 691                                 hammer_unref(&ip->lock);
 692                                 break;
 693                         }
 694                 }
 695         }
 696 }
 697
 698 /*
 699  * Unload and destroy the specified inode.  Must be called with one remaining
 700  * reference.  The reference is disposed of.
 701  *
 702  * This can only be called in the context of the flusher.
 703  */
 704 static int
 705 hammer_unload_inode(struct hammer_inode *ip)
 706 {
 707         hammer_mount_t hmp = ip->hmp;
 708
 709         KASSERT(ip->lock.refs == 1,
 710                 ("hammer_unload_inode: %d refs\n", ip->lock.refs));
 711         KKASSERT(ip->vp == NULL);
 712         KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
 713         KKASSERT(ip->cursor_ip_refs == 0);
 714         KKASSERT(ip->lock.lockcount == 0);
 715         KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
 716
 717         KKASSERT(RB_EMPTY(&ip->rec_tree));
 718         KKASSERT(TAILQ_EMPTY(&ip->target_list));
 719
 720         RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
 721
 722         hammer_uncache_node(&ip->cache[0]);
 723         hammer_uncache_node(&ip->cache[1]);
 724         if (ip->objid_cache)
 725                 hammer_clear_objid(ip);
 726         --hammer_count_inodes;
 727         --hmp->count_inodes;
 728         if (hmp->flags & HAMMER_MOUNT_WAITIMAX)
 729                 hammer_inode_wakereclaims(hmp);
 730
 731         if (ip->flags & HAMMER_INODE_RECLAIM) {
 732                 --hammer_count_reclaiming;
 733                 --hmp->inode_reclaims;
 734                 ip->flags &= ~HAMMER_INODE_RECLAIM;
 735         }
 736         kfree(ip, M_HAMMER);
 737
 738         return(0);
 739 }
 740
 741 /*
 742  * Called on mount -u when switching from RW to RO or vise-versa.  Adjust
 743  * the read-only flag for cached inodes.
 744  *
 745  * This routine is called from a RB_SCAN().
 746  */
 747 int
 748 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
 749 {
 750         hammer_mount_t hmp = ip->hmp;
 751
 752         if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
 753                 ip->flags |= HAMMER_INODE_RO;
 754         else
 755                 ip->flags &= ~HAMMER_INODE_RO;
 756         return(0);
 757 }
 758
 759 /*
 760  * A transaction has modified an inode, requiring updates as specified by
 761  * the passed flags.
 762  *
 763  * HAMMER_INODE_DDIRTY: Inode data has been updated
 764  * HAMMER_INODE_XDIRTY: Dirty in-memory records
 765  * HAMMER_INODE_BUFS:   Dirty buffer cache buffers
 766  * HAMMER_INODE_DELETED: Inode record/data must be deleted
 767  * HAMMER_INODE_ITIMES: mtime/atime has been updated
 768  */
 769 void
 770 hammer_modify_inode(hammer_inode_t ip, int flags)
 771 {
 772         KKASSERT ((ip->flags & HAMMER_INODE_RO) == 0 ||
 773                   (flags & (HAMMER_INODE_DDIRTY |
 774                             HAMMER_INODE_XDIRTY | HAMMER_INODE_BUFS |
 775                             HAMMER_INODE_DELETED | HAMMER_INODE_ITIMES)) == 0);
 776         if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
 777                 ip->flags |= HAMMER_INODE_RSV_INODES;
 778                 ++ip->hmp->rsv_inodes;
 779         }
 780
 781         ip->flags |= flags;
 782 }
 783
 784 /*
 785  * Request that an inode be flushed.  This whole mess cannot block and may
 786  * recurse.  Once requested HAMMER will attempt to actively flush it until
 787  * the flush can be done.
 788  *
 789  * The inode may already be flushing, or may be in a setup state.  We can
 790  * place the inode in a flushing state if it is currently idle and flag it
 791  * to reflush if it is currently flushing.
 792  */
 793 void
 794 hammer_flush_inode(hammer_inode_t ip, int flags)
 795 {
 796         hammer_record_t depend;
 797         int r, good;
 798
 799         /*
 800          * Trivial 'nothing to flush' case.  If the inode is ina SETUP
 801          * state we have to put it back into an IDLE state so we can
 802          * drop the extra ref.
 803          */
 804         if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
 805                 if (ip->flush_state == HAMMER_FST_SETUP) {
 806                         ip->flush_state = HAMMER_FST_IDLE;
 807                         hammer_rel_inode(ip, 0);
 808                 }
 809                 return;
 810         }
 811
 812         /*
 813          * Our flush action will depend on the current state.
 814          */
 815         switch(ip->flush_state) {
 816         case HAMMER_FST_IDLE:
 817                 /*
 818                  * We have no dependancies and can flush immediately.  Some
 819                  * our children may not be flushable so we have to re-test
 820                  * with that additional knowledge.
 821                  */
 822                 hammer_flush_inode_core(ip, flags);
 823                 break;
 824         case HAMMER_FST_SETUP:
 825                 /*
 826                  * Recurse upwards through dependancies via target_list
 827                  * and start their flusher actions going if possible.
 828                  *
 829                  * 'good' is our connectivity.  -1 means we have none and
 830                  * can't flush, 0 means there weren't any dependancies, and
 831                  * 1 means we have good connectivity.
 832                  */
 833                 good = 0;
 834                 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
 835                         r = hammer_setup_parent_inodes(depend);
 836                         if (r < 0 && good == 0)
 837                                 good = -1;
 838                         if (r > 0)
 839                                 good = 1;
 840                 }
 841
 842                 /*
 843                  * We can continue if good >= 0.  Determine how many records
 844                  * under our inode can be flushed (and mark them).
 845                  */
 846                 if (good >= 0) {
 847                         hammer_flush_inode_core(ip, flags);
 848                 } else {
 849                         ip->flags |= HAMMER_INODE_REFLUSH;
 850                         if (flags & HAMMER_FLUSH_SIGNAL) {
 851                                 ip->flags |= HAMMER_INODE_RESIGNAL;
 852                                 hammer_flusher_async(ip->hmp);
 853                         }
 854                 }
 855                 break;
 856         default:
 857                 /*
 858                  * We are already flushing, flag the inode to reflush
 859                  * if needed after it completes its current flush.
 860                  */
 861                 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
 862                         ip->flags |= HAMMER_INODE_REFLUSH;
 863                 if (flags & HAMMER_FLUSH_SIGNAL) {
 864                         ip->flags |= HAMMER_INODE_RESIGNAL;
 865                         hammer_flusher_async(ip->hmp);
 866                 }
 867                 break;
 868         }
 869 }
 870
 871 /*
 872  * We are asked to recurse upwards and convert the record from SETUP
 873  * to FLUSH if possible.  record->ip is a parent of the caller's inode,
 874  * and record->target_ip is the caller's inode.
 875  *
 876  * Return 1 if the record gives us connectivity
 877  *
 878  * Return 0 if the record is not relevant
 879  *
 880  * Return -1 if we can't resolve the dependancy and there is no connectivity.
 881  */
 882 static int
 883 hammer_setup_parent_inodes(hammer_record_t record)
 884 {
 885         hammer_mount_t hmp = record->ip->hmp;
 886         hammer_record_t depend;
 887         hammer_inode_t ip;
 888         int r, good;
 889
 890         KKASSERT(record->flush_state != HAMMER_FST_IDLE);
 891         ip = record->ip;
 892
 893         /*
 894          * If the record is already flushing, is it in our flush group?
 895          *
 896          * If it is in our flush group but it is a general record or a
 897          * delete-on-disk, it does not improve our connectivity (return 0),
 898          * and if the target inode is not trying to destroy itself we can't
 899          * allow the operation yet anyway (the second return -1).
 900          */
 901         if (record->flush_state == HAMMER_FST_FLUSH) {
 902                 if (record->flush_group != hmp->flusher_next) {
 903                         ip->flags |= HAMMER_INODE_REFLUSH;
 904                         return(-1);
 905                 }
 906                 if (record->type == HAMMER_MEM_RECORD_ADD)
 907                         return(1);
 908                 /* GENERAL or DEL */
 909                 return(0);
 910         }
 911
 912         /*
 913          * It must be a setup record.  Try to resolve the setup dependancies
 914          * by recursing upwards so we can place ip on the flush list.
 915          */
 916         KKASSERT(record->flush_state == HAMMER_FST_SETUP);
 917
 918         good = 0;
 919         TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
 920                 r = hammer_setup_parent_inodes(depend);
 921                 if (r < 0 && good == 0)
 922                         good = -1;
 923                 if (r > 0)
 924                         good = 1;
 925         }
 926
 927         /*
 928          * We can't flush ip because it has no connectivity (XXX also check
 929          * nlinks for pre-existing connectivity!).  Flag it so any resolution
 930          * recurses back down.
 931          */
 932         if (good < 0) {
 933                 ip->flags |= HAMMER_INODE_REFLUSH;
 934                 return(good);
 935         }
 936
 937         /*
 938          * We are go, place the parent inode in a flushing state so we can
 939          * place its record in a flushing state.  Note that the parent
 940          * may already be flushing.  The record must be in the same flush
 941          * group as the parent.
 942          */
 943         if (ip->flush_state != HAMMER_FST_FLUSH)
 944                 hammer_flush_inode_core(ip, HAMMER_FLUSH_RECURSION);
 945         KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
 946         KKASSERT(record->flush_state == HAMMER_FST_SETUP);
 947
 948 #if 0
 949         if (record->type == HAMMER_MEM_RECORD_DEL &&
 950             (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
 951                 /*
 952                  * Regardless of flushing state we cannot sync this path if the
 953                  * record represents a delete-on-disk but the target inode
 954                  * is not ready to sync its own deletion.
 955                  *
 956                  * XXX need to count effective nlinks to determine whether
 957                  * the flush is ok, otherwise removing a hardlink will
 958                  * just leave the DEL record to rot.
 959                  */
 960                 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
 961                 return(-1);
 962         } else
 963 #endif
 964         if (ip->flush_group == ip->hmp->flusher_next) {
 965                 /*
 966                  * This is the record we wanted to synchronize.
 967                  */
 968                 record->flush_state = HAMMER_FST_FLUSH;
 969                 record->flush_group = ip->flush_group;
 970                 hammer_ref(&record->lock);
 971                 if (record->type == HAMMER_MEM_RECORD_ADD)
 972                         return(1);
 973
 974                 /*
 975                  * A general or delete-on-disk record does not contribute
 976                  * to our visibility.  We can still flush it, however.
 977                  */
 978                 return(0);
 979         } else {
 980                 /*
 981                  * We couldn't resolve the dependancies, request that the
 982                  * inode be flushed when the dependancies can be resolved.
 983                  */
 984                 ip->flags |= HAMMER_INODE_REFLUSH;
 985                 return(-1);
 986         }
 987 }
 988
 989 /*
 990  * This is the core routine placing an inode into the FST_FLUSH state.
 991  */
 992 static void
 993 hammer_flush_inode_core(hammer_inode_t ip, int flags)
 994 {
 995         int go_count;
 996
 997         /*
 998          * Set flush state and prevent the flusher from cycling into
 999          * the next flush group.  Do not place the ip on the list yet.
1000          * Inodes not in the idle state get an extra reference.
1001          */
1002         KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
1003         if (ip->flush_state == HAMMER_FST_IDLE)
1004                 hammer_ref(&ip->lock);
1005         ip->flush_state = HAMMER_FST_FLUSH;
1006         ip->flush_group = ip->hmp->flusher_next;
1007         ++ip->hmp->flusher_lock;
1008
1009         /*
1010          * We need to be able to vfsync/truncate from the backend.
1011          */
1012         KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
1013         if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
1014                 ip->flags |= HAMMER_INODE_VHELD;
1015                 vref(ip->vp);
1016         }
1017
1018         /*
1019          * Figure out how many in-memory records we can actually flush
1020          * (not including inode meta-data, buffers, etc).
1021          */
1022         if (flags & HAMMER_FLUSH_RECURSION) {
1023                 go_count = 1;
1024         } else {
1025                 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1026                                    hammer_setup_child_callback, NULL);
1027         }
1028
1029         /*
1030          * This is a more involved test that includes go_count.  If we
1031          * can't flush, flag the inode and return.  If go_count is 0 we
1032          * were are unable to flush any records in our rec_tree and
1033          * must ignore the XDIRTY flag.
1034          */
1035         if (go_count == 0) {
1036                 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
1037                         ip->flags |= HAMMER_INODE_REFLUSH;
1038                         ip->flush_state = HAMMER_FST_SETUP;
1039                         if (ip->flags & HAMMER_INODE_VHELD) {
1040                                 ip->flags &= ~HAMMER_INODE_VHELD;
1041                                 vrele(ip->vp);
1042                         }
1043                         if (flags & HAMMER_FLUSH_SIGNAL) {
1044                                 ip->flags |= HAMMER_INODE_RESIGNAL;
1045                                 hammer_flusher_async(ip->hmp);
1046                         }
1047                         if (--ip->hmp->flusher_lock == 0)
1048                                 wakeup(&ip->hmp->flusher_lock);
1049                         return;
1050                 }
1051         }
1052
1053         /*
1054          * Snapshot the state of the inode for the backend flusher.
1055          *
1056          * The truncation must be retained in the frontend until after
1057          * we've actually performed the record deletion.
1058          *
1059          * NOTE: The DELETING flag is a mod flag, but it is also sticky,
1060          * and stays in ip->flags.  Once set, it stays set until the
1061          * inode is destroyed.
1062          */
1063         ip->sync_flags = (ip->flags & HAMMER_INODE_MODMASK);
1064         ip->sync_trunc_off = ip->trunc_off;
1065         ip->sync_ino_leaf = ip->ino_leaf;
1066         ip->sync_ino_data = ip->ino_data;
1067         ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
1068         ip->flags &= ~HAMMER_INODE_MODMASK;
1069 #ifdef DEBUG_TRUNCATE
1070         if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp)
1071                 kprintf("truncateS %016llx\n", ip->sync_trunc_off);
1072 #endif
1073
1074         /*
1075          * The flusher list inherits our inode and reference.
1076          */
1077         TAILQ_INSERT_TAIL(&ip->hmp->flush_list, ip, flush_entry);
1078         if (--ip->hmp->flusher_lock == 0)
1079                 wakeup(&ip->hmp->flusher_lock);
1080
1081         if (flags & HAMMER_FLUSH_SIGNAL) {
1082                 hammer_flusher_async(ip->hmp);
1083         }
1084 }
1085
1086 /*
1087  * Callback for scan of ip->rec_tree.  Try to include each record in our
1088  * flush.  ip->flush_group has been set but the inode has not yet been
1089  * moved into a flushing state.
1090  *
1091  * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
1092  * both inodes.
1093  *
1094  * We return 1 for any record placed or found in FST_FLUSH, which prevents
1095  * the caller from shortcutting the flush.
1096  */
1097 static int
1098 hammer_setup_child_callback(hammer_record_t rec, void *data)
1099 {
1100         hammer_inode_t target_ip;
1101         hammer_inode_t ip;
1102         int r;
1103
1104         /*
1105          * If the record has been deleted by the backend (it's being held
1106          * by the frontend in a race), just ignore it.
1107          */
1108         if (rec->flags & HAMMER_RECF_DELETED_BE)
1109                 return(0);
1110
1111         /*
1112          * If the record is in an idle state it has no dependancies and
1113          * can be flushed.
1114          */
1115         ip = rec->ip;
1116         r = 0;
1117
1118         switch(rec->flush_state) {
1119         case HAMMER_FST_IDLE:
1120                 /*
1121                  * Record has no setup dependancy, we can flush it.
1122                  */
1123                 KKASSERT(rec->target_ip == NULL);
1124                 rec->flush_state = HAMMER_FST_FLUSH;
1125                 rec->flush_group = ip->flush_group;
1126                 hammer_ref(&rec->lock);
1127                 r = 1;
1128                 break;
1129         case HAMMER_FST_SETUP:
1130                 /*
1131                  * Record has a setup dependancy.  Try to include the
1132                  * target ip in the flush.
1133                  *
1134                  * We have to be careful here, if we do not do the right
1135                  * thing we can lose track of dirty inodes and the system
1136                  * will lockup trying to allocate buffers.
1137                  */
1138                 target_ip = rec->target_ip;
1139                 KKASSERT(target_ip != NULL);
1140                 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
1141                 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
1142                         /*
1143                          * If the target IP is already flushing in our group
1144                          * we are golden, otherwise make sure the target
1145                          * reflushes.
1146                          */
1147                         if (target_ip->flush_group == ip->flush_group) {
1148                                 rec->flush_state = HAMMER_FST_FLUSH;
1149                                 rec->flush_group = ip->flush_group;
1150                                 hammer_ref(&rec->lock);
1151                                 r = 1;
1152                         } else {
1153                                 target_ip->flags |= HAMMER_INODE_REFLUSH;
1154                         }
1155                 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
1156                         /*
1157                          * If the target IP is not flushing we can force
1158                          * it to flush, even if it is unable to write out
1159                          * any of its own records we have at least one in
1160                          * hand that we CAN deal with.
1161                          */
1162                         rec->flush_state = HAMMER_FST_FLUSH;
1163                         rec->flush_group = ip->flush_group;
1164                         hammer_ref(&rec->lock);
1165                         hammer_flush_inode_core(target_ip,
1166                                                 HAMMER_FLUSH_RECURSION);
1167                         r = 1;
1168                 } else {
1169                         /*
1170                          * General or delete-on-disk record.
1171                          *
1172                          * XXX this needs help.  If a delete-on-disk we could
1173                          * disconnect the target.  If the target has its own
1174                          * dependancies they really need to be flushed.
1175                          *
1176                          * XXX
1177                          */
1178                         rec->flush_state = HAMMER_FST_FLUSH;
1179                         rec->flush_group = ip->flush_group;
1180                         hammer_ref(&rec->lock);
1181                         hammer_flush_inode_core(target_ip,
1182                                                 HAMMER_FLUSH_RECURSION);
1183                         r = 1;
1184                 }
1185                 break;
1186         case HAMMER_FST_FLUSH:
1187                 /*
1188                  * Record already associated with a flush group.  It had
1189                  * better be ours.
1190                  */
1191                 KKASSERT(rec->flush_group == ip->flush_group);
1192                 r = 1;
1193                 break;
1194         }
1195         return(r);
1196 }
1197
1198 /*
1199  * Wait for a previously queued flush to complete
1200  */
1201 void
1202 hammer_wait_inode(hammer_inode_t ip)
1203 {
1204         while (ip->flush_state != HAMMER_FST_IDLE) {
1205                 if (ip->flush_state == HAMMER_FST_SETUP) {
1206                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
1207                 } else {
1208                         ip->flags |= HAMMER_INODE_FLUSHW;
1209                         tsleep(&ip->flags, 0, "hmrwin", 0);
1210                 }
1211         }
1212 }
1213
1214 /*
1215  * Called by the backend code when a flush has been completed.
1216  * The inode has already been removed from the flush list.
1217  *
1218  * A pipelined flush can occur, in which case we must re-enter the
1219  * inode on the list and re-copy its fields.
1220  */
1221 void
1222 hammer_flush_inode_done(hammer_inode_t ip)
1223 {
1224         int dorel = 0;
1225
1226         KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
1227
1228         /*
1229          * Merge left-over flags back into the frontend and fix the state.
1230          */
1231         ip->flags |= ip->sync_flags;
1232
1233         /*
1234          * The backend may have adjusted nlinks, so if the adjusted nlinks
1235          * does not match the fronttend set the frontend's RDIRTY flag again.
1236          */
1237         if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
1238                 ip->flags |= HAMMER_INODE_DDIRTY;
1239
1240         /*
1241          * Fix up the dirty buffer status.  IO completions will also
1242          * try to clean up rsv_databufs.
1243          */
1244         if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
1245                 ip->flags |= HAMMER_INODE_BUFS;
1246         } else {
1247                 ip->hmp->rsv_databufs -= ip->rsv_databufs;
1248                 ip->rsv_databufs = 0;
1249         }
1250
1251         /*
1252          * Re-set the XDIRTY flag if some of the inode's in-memory records
1253          * could not be flushed.
1254          */
1255         KKASSERT((RB_EMPTY(&ip->rec_tree) &&
1256                   (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
1257                  (!RB_EMPTY(&ip->rec_tree) &&
1258                   (ip->flags & HAMMER_INODE_XDIRTY) != 0));
1259
1260         /*
1261          * Do not lose track of inodes which no longer have vnode
1262          * assocations, otherwise they may never get flushed again.
1263          */
1264         if ((ip->flags & HAMMER_INODE_MODMASK) && ip->vp == NULL)
1265                 ip->flags |= HAMMER_INODE_REFLUSH;
1266
1267         /*
1268          * Adjust flush_state.  The target state (idle or setup) shouldn't
1269          * be terribly important since we will reflush if we really need
1270          * to do anything. XXX
1271          */
1272         if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
1273                 ip->flush_state = HAMMER_FST_IDLE;
1274                 dorel = 1;
1275         } else {
1276                 ip->flush_state = HAMMER_FST_SETUP;
1277         }
1278
1279         /*
1280          * Clean up the vnode ref
1281          */
1282         if (ip->flags & HAMMER_INODE_VHELD) {
1283                 ip->flags &= ~HAMMER_INODE_VHELD;
1284                 vrele(ip->vp);
1285         }
1286
1287         /*
1288          * If the frontend made more changes and requested another flush,
1289          * then try to get it running.
1290          */
1291         if (ip->flags & HAMMER_INODE_REFLUSH) {
1292                 ip->flags &= ~HAMMER_INODE_REFLUSH;
1293                 if (ip->flags & HAMMER_INODE_RESIGNAL) {
1294                         ip->flags &= ~HAMMER_INODE_RESIGNAL;
1295                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
1296                 } else {
1297                         hammer_flush_inode(ip, 0);
1298                 }
1299         }
1300
1301         /*
1302          * If the inode is now clean drop the space reservation.
1303          */
1304         if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
1305             (ip->flags & HAMMER_INODE_RSV_INODES)) {
1306                 ip->flags &= ~HAMMER_INODE_RSV_INODES;
1307                 --ip->hmp->rsv_inodes;
1308         }
1309
1310         /*
1311          * Finally, if the frontend is waiting for a flush to complete,
1312          * wake it up.
1313          */
1314         if (ip->flush_state != HAMMER_FST_FLUSH) {
1315                 if (ip->flags & HAMMER_INODE_FLUSHW) {
1316                         ip->flags &= ~HAMMER_INODE_FLUSHW;
1317                         wakeup(&ip->flags);
1318                 }
1319         }
1320         if (dorel)
1321                 hammer_rel_inode(ip, 0);
1322 }
1323
1324 /*
1325  * Called from hammer_sync_inode() to synchronize in-memory records
1326  * to the media.
1327  */
1328 static int
1329 hammer_sync_record_callback(hammer_record_t record, void *data)
1330 {
1331         hammer_cursor_t cursor = data;
1332         hammer_transaction_t trans = cursor->trans;
1333         int error;
1334
1335         /*
1336          * Skip records that do not belong to the current flush.
1337          */
1338         ++hammer_stats_record_iterations;
1339         if (record->flush_state != HAMMER_FST_FLUSH)
1340                 return(0);
1341
1342 #if 1
1343         if (record->flush_group != record->ip->flush_group) {
1344                 kprintf("sync_record %p ip %p bad flush group %d %d\n", record, record->ip, record->flush_group ,record->ip->flush_group);
1345                 Debugger("blah2");
1346                 return(0);
1347         }
1348 #endif
1349         KKASSERT(record->flush_group == record->ip->flush_group);
1350
1351         /*
1352          * Interlock the record using the BE flag.  Once BE is set the
1353          * frontend cannot change the state of FE.
1354          *
1355          * NOTE: If FE is set prior to us setting BE we still sync the
1356          * record out, but the flush completion code converts it to
1357          * a delete-on-disk record instead of destroying it.
1358          */
1359         KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
1360         record->flags |= HAMMER_RECF_INTERLOCK_BE;
1361
1362         /*
1363          * The backend may have already disposed of the record.
1364          */
1365         if (record->flags & HAMMER_RECF_DELETED_BE) {
1366                 error = 0;
1367                 goto done;
1368         }
1369
1370         /*
1371          * If the whole inode is being deleting all on-disk records will
1372          * be deleted very soon, we can't sync any new records to disk
1373          * because they will be deleted in the same transaction they were
1374          * created in (delete_tid == create_tid), which will assert.
1375          *
1376          * XXX There may be a case with RECORD_ADD with DELETED_FE set
1377          * that we currently panic on.
1378          */
1379         if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
1380                 switch(record->type) {
1381                 case HAMMER_MEM_RECORD_DATA:
1382                         /*
1383                          * We don't have to do anything, if the record was
1384                          * committed the space will have been accounted for
1385                          * in the blockmap.
1386                          */
1387                         /* fall through */
1388                 case HAMMER_MEM_RECORD_GENERAL:
1389                         record->flags |= HAMMER_RECF_DELETED_FE;
1390                         record->flags |= HAMMER_RECF_DELETED_BE;
1391                         error = 0;
1392                         goto done;
1393                 case HAMMER_MEM_RECORD_ADD:
1394                         panic("hammer_sync_record_callback: illegal add "
1395                               "during inode deletion record %p", record);
1396                         break; /* NOT REACHED */
1397                 case HAMMER_MEM_RECORD_INODE:
1398                         panic("hammer_sync_record_callback: attempt to "
1399                               "sync inode record %p?", record);
1400                         break; /* NOT REACHED */
1401                 case HAMMER_MEM_RECORD_DEL:
1402                         /*
1403                          * Follow through and issue the on-disk deletion
1404                          */
1405                         break;
1406                 }
1407         }
1408
1409         /*
1410          * If DELETED_FE is set we may have already sent dependant pieces
1411          * to the disk and we must flush the record as if it hadn't been
1412          * deleted.  This creates a bit of a mess because we have to
1413          * have ip_sync_record convert the record to MEM_RECORD_DEL before
1414          * it inserts the B-Tree record.  Otherwise the media sync might
1415          * be visible to the frontend.
1416          */
1417         if (record->flags & HAMMER_RECF_DELETED_FE) {
1418                 if (record->type == HAMMER_MEM_RECORD_ADD) {
1419                         record->flags |= HAMMER_RECF_CONVERT_DELETE;
1420                 } else {
1421                         KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
1422                         return(0);
1423                 }
1424         }
1425
1426         /*
1427          * Assign the create_tid for new records.  Deletions already
1428          * have the record's entire key properly set up.
1429          */
1430         if (record->type != HAMMER_MEM_RECORD_DEL)
1431                 record->leaf.base.create_tid = trans->tid;
1432         for (;;) {
1433                 error = hammer_ip_sync_record_cursor(cursor, record);
1434                 if (error != EDEADLK)
1435                         break;
1436                 hammer_done_cursor(cursor);
1437                 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
1438                                            record->ip);
1439                 if (error)
1440                         break;
1441         }
1442         record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
1443
1444         if (error) {
1445                 error = -error;
1446                 if (error != -ENOSPC) {
1447                         kprintf("hammer_sync_record_callback: sync failed rec "
1448                                 "%p, error %d\n", record, error);
1449                         Debugger("sync failed rec");
1450                 }
1451         }
1452 done:
1453         hammer_flush_record_done(record, error);
1454         return(error);
1455 }
1456
1457 /*
1458  * XXX error handling
1459  */
1460 int
1461 hammer_sync_inode(hammer_inode_t ip)
1462 {
1463         struct hammer_transaction trans;
1464         struct hammer_cursor cursor;
1465         hammer_record_t depend;
1466         hammer_record_t next;
1467         int error, tmp_error;
1468         u_int64_t nlinks;
1469
1470         if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
1471                 return(0);
1472
1473         hammer_start_transaction_fls(&trans, ip->hmp);
1474         error = hammer_init_cursor(&trans, &cursor, &ip->cache[0], ip);
1475         if (error)
1476                 goto done;
1477
1478         /*
1479          * Any directory records referencing this inode which are not in
1480          * our current flush group must adjust our nlink count for the
1481          * purposes of synchronization to disk.
1482          *
1483          * Records which are in our flush group can be unlinked from our
1484          * inode now, potentially allowing the inode to be physically
1485          * deleted.
1486          */
1487         nlinks = ip->ino_data.nlinks;
1488         next = TAILQ_FIRST(&ip->target_list);
1489         while ((depend = next) != NULL) {
1490                 next = TAILQ_NEXT(depend, target_entry);
1491                 if (depend->flush_state == HAMMER_FST_FLUSH &&
1492                     depend->flush_group == ip->hmp->flusher_act) {
1493                         /*
1494                          * If this is an ADD that was deleted by the frontend
1495                          * the frontend nlinks count will have already been
1496                          * decremented, but the backend is going to sync its
1497                          * directory entry and must account for it.  The
1498                          * record will be converted to a delete-on-disk when
1499                          * it gets synced.
1500                          *
1501                          * If the ADD was not deleted by the frontend we
1502                          * can remove the dependancy from our target_list.
1503                          */
1504                         if (depend->flags & HAMMER_RECF_DELETED_FE) {
1505                                 ++nlinks;
1506                         } else {
1507                                 TAILQ_REMOVE(&ip->target_list, depend,
1508                                              target_entry);
1509                                 depend->target_ip = NULL;
1510                         }
1511                 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
1512                         /*
1513                          * Not part of our flush group
1514                          */
1515                         KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
1516                         switch(depend->type) {
1517                         case HAMMER_MEM_RECORD_ADD:
1518                                 --nlinks;
1519                                 break;
1520                         case HAMMER_MEM_RECORD_DEL:
1521                                 ++nlinks;
1522                                 break;
1523                         default:
1524                                 break;
1525                         }
1526                 }
1527         }
1528
1529         /*
1530          * Set dirty if we had to modify the link count.
1531          */
1532         if (ip->sync_ino_data.nlinks != nlinks) {
1533                 KKASSERT((int64_t)nlinks >= 0);
1534                 ip->sync_ino_data.nlinks = nlinks;
1535                 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1536         }
1537
1538 #if 0
1539         /*
1540          * XXX DISABLED FOR NOW.  With the new reservation support
1541          * we cannot resync pending data without confusing the hell
1542          * out of the in-memory record tree.
1543          */
1544         /*
1545          * Queue up as many dirty buffers as we can then set a flag to
1546          * cause any further BIOs to go to the alternative queue.
1547          */
1548         if (ip->flags & HAMMER_INODE_VHELD)
1549                 error = vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
1550         ip->flags |= HAMMER_INODE_WRITE_ALT;
1551
1552         /*
1553          * The buffer cache may contain dirty buffers beyond the inode
1554          * state we copied from the frontend to the backend.  Because
1555          * we are syncing our buffer cache on the backend, resync
1556          * the truncation point and the file size so we don't wipe out
1557          * any data.
1558          *
1559          * Syncing the buffer cache on the frontend has serious problems
1560          * because it prevents us from passively queueing dirty inodes
1561          * to the backend (the BIO's could stall indefinitely).
1562          */
1563         if (ip->flags & HAMMER_INODE_TRUNCATED) {
1564                 ip->sync_trunc_off = ip->trunc_off;
1565                 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
1566         }
1567         if (ip->sync_ino_data.size != ip->ino_data.size) {
1568                 ip->sync_ino_data.size = ip->ino_data.size;
1569                 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1570         }
1571 #endif
1572
1573         /*
1574          * If there is a trunction queued destroy any data past the (aligned)
1575          * truncation point.  Userland will have dealt with the buffer
1576          * containing the truncation point for us.
1577          *
1578          * We don't flush pending frontend data buffers until after we've
1579          * dealth with the truncation.
1580          *
1581          * Don't bother if the inode is or has been deleted.
1582          */
1583         if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
1584                 /*
1585                  * Interlock trunc_off.  The VOP front-end may continue to
1586                  * make adjustments to it while we are blocked.
1587                  */
1588                 off_t trunc_off;
1589                 off_t aligned_trunc_off;
1590
1591                 trunc_off = ip->sync_trunc_off;
1592                 aligned_trunc_off = (trunc_off + HAMMER_BUFMASK) &
1593                                     ~HAMMER_BUFMASK64;
1594
1595                 /*
1596                  * Delete any whole blocks on-media.  The front-end has
1597                  * already cleaned out any partial block and made it
1598                  * pending.  The front-end may have updated trunc_off
1599                  * while we were blocked so we only use sync_trunc_off.
1600                  */
1601                 error = hammer_ip_delete_range(&cursor, ip,
1602                                                 aligned_trunc_off,
1603                                                 0x7FFFFFFFFFFFFFFFLL, 1);
1604                 if (error)
1605                         Debugger("hammer_ip_delete_range errored");
1606
1607                 /*
1608                  * Clear the truncation flag on the backend after we have
1609                  * complete the deletions.  Backend data is now good again
1610                  * (including new records we are about to sync, below).
1611                  */
1612                 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
1613                 ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL;
1614         } else {
1615                 error = 0;
1616         }
1617
1618         /*
1619          * Now sync related records.  These will typically be directory
1620          * entries or delete-on-disk records.
1621          *
1622          * Not all records will be flushed, but clear XDIRTY anyway.  We
1623          * will set it again in the frontend hammer_flush_inode_done()
1624          * if records remain.
1625          */
1626         if (error == 0) {
1627                 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1628                                     hammer_sync_record_callback, &cursor);
1629                 if (tmp_error < 0)
1630                         tmp_error = -error;
1631                 if (tmp_error)
1632                         error = tmp_error;
1633         }
1634
1635         /*
1636          * If we are deleting the inode the frontend had better not have
1637          * any active references on elements making up the inode.
1638          */
1639         if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
1640                 RB_EMPTY(&ip->rec_tree)  &&
1641             (ip->sync_flags & HAMMER_INODE_DELETING) &&
1642             (ip->flags & HAMMER_INODE_DELETED) == 0) {
1643                 int count1 = 0;
1644
1645                 ip->flags |= HAMMER_INODE_DELETED;
1646                 error = hammer_ip_delete_range_all(&cursor, ip, &count1);
1647                 if (error == 0) {
1648                         ip->sync_flags &= ~HAMMER_INODE_DELETING;
1649                         ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
1650                         KKASSERT(RB_EMPTY(&ip->rec_tree));
1651
1652                         /*
1653                          * Set delete_tid in both the frontend and backend
1654                          * copy of the inode record.  The DELETED flag handles
1655                          * this, do not set RDIRTY.
1656                          */
1657                         ip->ino_leaf.base.delete_tid = trans.tid;
1658                         ip->sync_ino_leaf.base.delete_tid = trans.tid;
1659
1660                         /*
1661                          * Adjust the inode count in the volume header
1662                          */
1663                         if (ip->flags & HAMMER_INODE_ONDISK) {
1664                                 hammer_modify_volume_field(&trans,
1665                                                            trans.rootvol,
1666                                                            vol0_stat_inodes);
1667                                 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
1668                                 hammer_modify_volume_done(trans.rootvol);
1669                         }
1670                 } else {
1671                         ip->flags &= ~HAMMER_INODE_DELETED;
1672                         Debugger("hammer_ip_delete_range_all errored");
1673                 }
1674         }
1675
1676         ip->sync_flags &= ~HAMMER_INODE_BUFS;
1677
1678         if (error)
1679                 Debugger("RB_SCAN errored");
1680
1681         /*
1682          * Now update the inode's on-disk inode-data and/or on-disk record.
1683          * DELETED and ONDISK are managed only in ip->flags.
1684          */
1685         switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
1686         case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
1687                 /*
1688                  * If deleted and on-disk, don't set any additional flags.
1689                  * the delete flag takes care of things.
1690                  *
1691                  * Clear flags which may have been set by the frontend.
1692                  */
1693                 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY|
1694                                     HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES|
1695                                     HAMMER_INODE_DELETING);
1696                 break;
1697         case HAMMER_INODE_DELETED:
1698                 /*
1699                  * Take care of the case where a deleted inode was never
1700                  * flushed to the disk in the first place.
1701                  *
1702                  * Clear flags which may have been set by the frontend.
1703                  */
1704                 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY|
1705                                     HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES|
1706                                     HAMMER_INODE_DELETING);
1707                 while (RB_ROOT(&ip->rec_tree)) {
1708                         hammer_record_t record = RB_ROOT(&ip->rec_tree);
1709                         hammer_ref(&record->lock);
1710                         KKASSERT(record->lock.refs == 1);
1711                         record->flags |= HAMMER_RECF_DELETED_FE;
1712                         record->flags |= HAMMER_RECF_DELETED_BE;
1713                         hammer_rel_mem_record(record);
1714                 }
1715                 break;
1716         case HAMMER_INODE_ONDISK:
1717                 /*
1718                  * If already on-disk, do not set any additional flags.
1719                  */
1720                 break;
1721         default:
1722                 /*
1723                  * If not on-disk and not deleted, set both dirty flags
1724                  * to force an initial record to be written.  Also set
1725                  * the create_tid for the inode.
1726                  *
1727                  * Set create_tid in both the frontend and backend
1728                  * copy of the inode record.
1729                  */
1730                 ip->ino_leaf.base.create_tid = trans.tid;
1731                 ip->sync_ino_leaf.base.create_tid = trans.tid;
1732                 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1733                 break;
1734         }
1735
1736         /*
1737          * If RDIRTY or DDIRTY is set, write out a new record.  If the inode
1738          * is already on-disk the old record is marked as deleted.
1739          *
1740          * If DELETED is set hammer_update_inode() will delete the existing
1741          * record without writing out a new one.
1742          *
1743          * If *ONLY* the ITIMES flag is set we can update the record in-place.
1744          */
1745         if (ip->flags & HAMMER_INODE_DELETED) {
1746                 error = hammer_update_inode(&cursor, ip);
1747         } else
1748         if ((ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES)) ==
1749             HAMMER_INODE_ITIMES) {
1750                 error = hammer_update_itimes(&cursor, ip);
1751         } else
1752         if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES)) {
1753                 error = hammer_update_inode(&cursor, ip);
1754         }
1755         if (error)
1756                 Debugger("hammer_update_itimes/inode errored");
1757 done:
1758         /*
1759          * Save the TID we used to sync the inode with to make sure we
1760          * do not improperly reuse it.
1761          */
1762         hammer_done_cursor(&cursor);
1763         hammer_done_transaction(&trans);
1764         return(error);
1765 }
1766
1767 /*
1768  * This routine is called when the OS is no longer actively referencing
1769  * the inode (but might still be keeping it cached), or when releasing
1770  * the last reference to an inode.
1771  *
1772  * At this point if the inode's nlinks count is zero we want to destroy
1773  * it, which may mean destroying it on-media too.
1774  */
1775 void
1776 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
1777 {
1778         struct vnode *vp;
1779
1780         /*
1781          * Set the DELETING flag when the link count drops to 0 and the
1782          * OS no longer has any opens on the inode.
1783          *
1784          * The backend will clear DELETING (a mod flag) and set DELETED
1785          * (a state flag) when it is actually able to perform the
1786          * operation.
1787          */
1788         if (ip->ino_data.nlinks == 0 &&
1789             (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
1790                 ip->flags |= HAMMER_INODE_DELETING;
1791                 ip->flags |= HAMMER_INODE_TRUNCATED;
1792                 ip->trunc_off = 0;
1793                 vp = NULL;
1794                 if (getvp) {
1795                         if (hammer_get_vnode(ip, &vp) != 0)
1796                                 return;
1797                 }
1798
1799                 /*
1800                  * Final cleanup
1801                  */
1802                 if (ip->vp) {
1803                         vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE);
1804                         vnode_pager_setsize(ip->vp, 0);
1805                 }
1806                 if (getvp) {
1807                         vput(vp);
1808                 }
1809         }
1810 }
1811
1812 /*
1813  * Re-test an inode when a dependancy had gone away to see if we
1814  * can chain flush it.
1815  */
1816 void
1817 hammer_test_inode(hammer_inode_t ip)
1818 {
1819         if (ip->flags & HAMMER_INODE_REFLUSH) {
1820                 ip->flags &= ~HAMMER_INODE_REFLUSH;
1821                 hammer_ref(&ip->lock);
1822                 if (ip->flags & HAMMER_INODE_RESIGNAL) {
1823                         ip->flags &= ~HAMMER_INODE_RESIGNAL;
1824                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
1825                 } else {
1826                         hammer_flush_inode(ip, 0);
1827                 }
1828                 hammer_rel_inode(ip, 0);
1829         }
1830 }
1831
1832 /*
1833  * When a HAMMER inode is reclaimed it may have to be queued to the backend
1834  * for its final sync to disk.  Programs like blogbench can cause the backlog
1835  * to grow indefinitely.  Put a cap on the number of inodes we allow to be
1836  * in this state by giving the flusher time to drain.
1837  */
1838 void
1839 hammer_inode_waitreclaims(hammer_mount_t hmp)
1840 {
1841         while (hmp->inode_reclaims > HAMMER_RECLAIM_MIN &&
1842                hmp->inode_reclaims > hmp->count_inodes / HAMMER_RECLAIM_FACTOR) {
1843                 hmp->flags |= HAMMER_MOUNT_WAITIMAX;
1844                 hammer_flusher_async(hmp);
1845                 tsleep(hmp, 0, "hmimax", hz / 10);
1846         }
1847 }
1848
1849 void
1850 hammer_inode_wakereclaims(hammer_mount_t hmp)
1851 {
1852         if (hmp->inode_reclaims <= HAMMER_RECLAIM_MIN ||
1853             hmp->inode_reclaims <= hmp->count_inodes / HAMMER_RECLAIM_FACTOR) {
1854                 hmp->flags &= ~HAMMER_MOUNT_WAITIMAX;
1855                 wakeup(hmp);
1856         }
1857 }
1858