sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2015 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  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   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/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         int error;
  71         int waitfor;
  72 };
  73
  74 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  75 TAILQ_HEAD(hammer2_pfslist, hammer2_pfs);
  76 static struct hammer2_mntlist hammer2_mntlist;
  77 static struct hammer2_pfslist hammer2_pfslist;
  78 static struct lock hammer2_mntlk;
  79
  80 int hammer2_debug;
  81 int hammer2_cluster_enable = 1;
  82 int hammer2_hardlink_enable = 1;
  83 int hammer2_flush_pipe = 100;
  84 int hammer2_synchronous_flush = 1;
  85 int hammer2_dio_count;
  86 long hammer2_limit_dirty_chains;
  87 long hammer2_iod_file_read;
  88 long hammer2_iod_meta_read;
  89 long hammer2_iod_indr_read;
  90 long hammer2_iod_fmap_read;
  91 long hammer2_iod_volu_read;
  92 long hammer2_iod_file_write;
  93 long hammer2_iod_meta_write;
  94 long hammer2_iod_indr_write;
  95 long hammer2_iod_fmap_write;
  96 long hammer2_iod_volu_write;
  97 long hammer2_ioa_file_read;
  98 long hammer2_ioa_meta_read;
  99 long hammer2_ioa_indr_read;
 100 long hammer2_ioa_fmap_read;
 101 long hammer2_ioa_volu_read;
 102 long hammer2_ioa_fmap_write;
 103 long hammer2_ioa_file_write;
 104 long hammer2_ioa_meta_write;
 105 long hammer2_ioa_indr_write;
 106 long hammer2_ioa_volu_write;
 107
 108 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 109 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 110                 "Buffer used for compression.");
 111
 112 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 113 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 114                 "Buffer used for decompression.");
 115
 116 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 117
 118 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 119            &hammer2_debug, 0, "");
 120 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 121            &hammer2_cluster_enable, 0, "");
 122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 123            &hammer2_hardlink_enable, 0, "");
 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 125            &hammer2_flush_pipe, 0, "");
 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 127            &hammer2_synchronous_flush, 0, "");
 128 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 129            &hammer2_limit_dirty_chains, 0, "");
 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 131            &hammer2_dio_count, 0, "");
 132
 133 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 134            &hammer2_iod_file_read, 0, "");
 135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 136            &hammer2_iod_meta_read, 0, "");
 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 138            &hammer2_iod_indr_read, 0, "");
 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 140            &hammer2_iod_fmap_read, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 142            &hammer2_iod_volu_read, 0, "");
 143
 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 145            &hammer2_iod_file_write, 0, "");
 146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 147            &hammer2_iod_meta_write, 0, "");
 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 149            &hammer2_iod_indr_write, 0, "");
 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 151            &hammer2_iod_fmap_write, 0, "");
 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 153            &hammer2_iod_volu_write, 0, "");
 154
 155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 156            &hammer2_ioa_file_read, 0, "");
 157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 158            &hammer2_ioa_meta_read, 0, "");
 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 160            &hammer2_ioa_indr_read, 0, "");
 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 162            &hammer2_ioa_fmap_read, 0, "");
 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 164            &hammer2_ioa_volu_read, 0, "");
 165
 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 167            &hammer2_ioa_file_write, 0, "");
 168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 169            &hammer2_ioa_meta_write, 0, "");
 170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 171            &hammer2_ioa_indr_write, 0, "");
 172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 173            &hammer2_ioa_fmap_write, 0, "");
 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 175            &hammer2_ioa_volu_write, 0, "");
 176
 177 static int hammer2_vfs_init(struct vfsconf *conf);
 178 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 179 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 180                                 struct ucred *cred);
 181 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 182                                 struct vnode *, struct ucred *);
 183 static int hammer2_recovery(hammer2_dev_t *hmp);
 184 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 185 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 186 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 187                                 struct ucred *cred);
 188 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 189                                 struct ucred *cred);
 190 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 191                                 ino_t ino, struct vnode **vpp);
 192 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 193                                 struct fid *fhp, struct vnode **vpp);
 194 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 195 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 196                                 int *exflagsp, struct ucred **credanonp);
 197
 198 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 199 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 200
 201 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 202
 203 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 204 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 205                                 hammer2_dev_t *hmp);
 206
 207 /*
 208  * HAMMER2 vfs operations.
 209  */
 210 static struct vfsops hammer2_vfsops = {
 211         .vfs_init       = hammer2_vfs_init,
 212         .vfs_uninit     = hammer2_vfs_uninit,
 213         .vfs_sync       = hammer2_vfs_sync,
 214         .vfs_mount      = hammer2_vfs_mount,
 215         .vfs_unmount    = hammer2_vfs_unmount,
 216         .vfs_root       = hammer2_vfs_root,
 217         .vfs_statfs     = hammer2_vfs_statfs,
 218         .vfs_statvfs    = hammer2_vfs_statvfs,
 219         .vfs_vget       = hammer2_vfs_vget,
 220         .vfs_vptofh     = hammer2_vfs_vptofh,
 221         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 222         .vfs_checkexp   = hammer2_vfs_checkexp
 223 };
 224
 225 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 226
 227 VFS_SET(hammer2_vfsops, hammer2, 0);
 228 MODULE_VERSION(hammer2, 1);
 229
 230 static
 231 int
 232 hammer2_vfs_init(struct vfsconf *conf)
 233 {
 234         static struct objcache_malloc_args margs_read;
 235         static struct objcache_malloc_args margs_write;
 236         static struct objcache_malloc_args margs_vop;
 237
 238         int error;
 239
 240         error = 0;
 241
 242         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 243                 error = EINVAL;
 244         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 245                 error = EINVAL;
 246         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 247                 error = EINVAL;
 248
 249         if (error)
 250                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 251
 252         margs_read.objsize = 65536;
 253         margs_read.mtype = M_HAMMER2_DEBUFFER;
 254
 255         margs_write.objsize = 32768;
 256         margs_write.mtype = M_HAMMER2_CBUFFER;
 257
 258         margs_vop.objsize = sizeof(hammer2_xop_t);
 259         margs_vop.mtype = M_HAMMER2;
 260
 261         /*
 262          * Note thaht for the XOPS cache we want backing store allocations
 263          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 264          * confusion), so use the backing store function that does it.  This
 265          * means that initial XOPS objects are zerod but REUSED objects are
 266          * not.  So we are responsible for cleaning the object up sufficiently
 267          * for our needs before objcache_put()ing it back (typically just the
 268          * FIFO indices).
 269          */
 270         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 271                                 0, 1, NULL, NULL, NULL,
 272                                 objcache_malloc_alloc,
 273                                 objcache_malloc_free,
 274                                 &margs_read);
 275         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 276                                 0, 1, NULL, NULL, NULL,
 277                                 objcache_malloc_alloc,
 278                                 objcache_malloc_free,
 279                                 &margs_write);
 280         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 281                                 0, 1, NULL, NULL, NULL,
 282                                 objcache_malloc_alloc_zero,
 283                                 objcache_malloc_free,
 284                                 &margs_vop);
 285
 286
 287         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 288         TAILQ_INIT(&hammer2_mntlist);
 289         TAILQ_INIT(&hammer2_pfslist);
 290
 291         hammer2_limit_dirty_chains = desiredvnodes / 10;
 292
 293         return (error);
 294 }
 295
 296 static
 297 int
 298 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 299 {
 300         objcache_destroy(cache_buffer_read);
 301         objcache_destroy(cache_buffer_write);
 302         objcache_destroy(cache_xops);
 303         return 0;
 304 }
 305
 306 /*
 307  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 308  * mounts and the spmp structure for media (hmp) structures.
 309  *
 310  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 311  * transactions.  Note that synchronization does not use this field.
 312  * (typically frontend operations and synchronization cannot run on the
 313  * same PFS node at the same time).
 314  *
 315  * XXX check locking
 316  */
 317 hammer2_pfs_t *
 318 hammer2_pfsalloc(hammer2_chain_t *chain, const hammer2_inode_data_t *ripdata,
 319                  hammer2_tid_t modify_tid)
 320 {
 321         hammer2_inode_t *iroot;
 322         hammer2_pfs_t *pmp;
 323         int count;
 324         int i;
 325         int j;
 326
 327         /*
 328          * Locate or create the PFS based on the cluster id.  If ripdata
 329          * is NULL this is a spmp which is unique and is always allocated.
 330          */
 331         if (ripdata) {
 332                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 333                         if (bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 334                                  sizeof(pmp->pfs_clid)) == 0) {
 335                                         break;
 336                         }
 337                 }
 338         } else {
 339                 pmp = NULL;
 340         }
 341
 342         if (pmp == NULL) {
 343                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 344                 hammer2_trans_manage_init(pmp);
 345                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 346                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 347                 lockinit(&pmp->lock, "pfslk", 0, 0);
 348                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 349                 spin_init(&pmp->xop_spin, "h2xop");
 350                 RB_INIT(&pmp->inum_tree);
 351                 TAILQ_INIT(&pmp->unlinkq);
 352                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 353
 354                 /*
 355                  * Distribute backend operations to threads
 356                  */
 357                 for (j = 0; j < HAMMER2_MAXCLUSTER; ++j)
 358                         TAILQ_INIT(&pmp->xopq[j]);
 359                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 360                         hammer2_xop_group_init(pmp, &pmp->xop_groups[j]);
 361
 362                 /*
 363                  * Save the last media transaction id for the flusher.  Set
 364                  * initial
 365                  */
 366                 if (ripdata)
 367                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 368                 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 369
 370                 /*
 371                  * The synchronization thread may start too early, make
 372                  * sure it stays frozen until we are ready to let it go.
 373                  * XXX
 374                  */
 375                 /*
 376                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 377                                          HAMMER2_THREAD_REMASTER;
 378                 */
 379         }
 380
 381         /*
 382          * Create the PFS's root inode.
 383          */
 384         if ((iroot = pmp->iroot) == NULL) {
 385                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 386                 pmp->iroot = iroot;
 387                 hammer2_inode_ref(iroot);
 388                 hammer2_inode_unlock(iroot);
 389         }
 390
 391         /*
 392          * Stop here if no chain is passed in.
 393          */
 394         if (chain == NULL)
 395                 goto done;
 396
 397         /*
 398          * When a chain is passed in we must add it to the PFS's root
 399          * inode, update pmp->pfs_types[], and update the syncronization
 400          * threads.
 401          *
 402          * At the moment empty spots can develop due to removals or failures.
 403          * Ultimately we want to re-fill these spots but doing so might
 404          * confused running code. XXX
 405          */
 406         hammer2_inode_ref(iroot);
 407         hammer2_mtx_ex(&iroot->lock);
 408         j = iroot->cluster.nchains;
 409
 410         kprintf("add PFS to pmp %p[%d]\n", pmp, j);
 411
 412         if (j == HAMMER2_MAXCLUSTER) {
 413                 kprintf("hammer2_mount: cluster full!\n");
 414                 /* XXX fatal error? */
 415         } else {
 416                 KKASSERT(chain->pmp == NULL);
 417                 chain->pmp = pmp;
 418                 hammer2_chain_ref(chain);
 419                 iroot->cluster.array[j].chain = chain;
 420                 pmp->pfs_types[j] = ripdata->meta.pfs_type;
 421                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 422                 pmp->pfs_hmps[j] = chain->hmp;
 423
 424                 /*
 425                  * If the PFS is already mounted we must account
 426                  * for the mount_count here.
 427                  */
 428                 if (pmp->mp)
 429                         ++chain->hmp->mount_count;
 430
 431                 /*
 432                  * May have to fixup dirty chain tracking.  Previous
 433                  * pmp was NULL so nothing to undo.
 434                  */
 435                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 436                         hammer2_pfs_memory_inc(pmp);
 437                 ++j;
 438         }
 439         iroot->cluster.nchains = j;
 440
 441         /*
 442          * Update nmasters from any PFS inode which is part of the cluster.
 443          * It is possible that this will result in a value which is too
 444          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 445          * override this value later on.
 446          *
 447          * (This informs us of masters that might not currently be
 448          *  discoverable by this mount).
 449          */
 450         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 451                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 452         }
 453
 454         /*
 455          * Count visible masters.  Masters are usually added with
 456          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 457          * are more (XXX and must update the master inodes).
 458          */
 459         count = 0;
 460         for (i = 0; i < iroot->cluster.nchains; ++i) {
 461                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 462                         ++count;
 463         }
 464         if (pmp->pfs_nmasters < count)
 465                 pmp->pfs_nmasters = count;
 466
 467         /*
 468          * Create missing synchronization and support threads.
 469          *
 470          * Single-node masters (including snapshots) have nothing to
 471          * synchronize and do not require this thread.
 472          *
 473          * Multi-node masters or any number of soft masters, slaves, copy,
 474          * or other PFS types need the thread.
 475          *
 476          * Each thread is responsible for its particular cluster index.
 477          * We use independent threads so stalls or mismatches related to
 478          * any given target do not affect other targets.
 479          */
 480         for (i = 0; i < iroot->cluster.nchains; ++i) {
 481                 /*
 482                  * Single-node masters (including snapshots) have nothing
 483                  * to synchronize and will make direct xops support calls,
 484                  * thus they do not require this thread.
 485                  *
 486                  * Note that there can be thousands of snapshots.  We do not
 487                  * want to create thousands of threads.
 488                  */
 489                 if (pmp->pfs_nmasters <= 1 &&
 490                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 491                         continue;
 492                 }
 493
 494                 /*
 495                  * Sync support thread
 496                  */
 497                 if (pmp->sync_thrs[i].td == NULL) {
 498                         hammer2_thr_create(&pmp->sync_thrs[i], pmp,
 499                                            "h2nod", i, -1,
 500                                            hammer2_primary_sync_thread);
 501                 }
 502         }
 503
 504         /*
 505          * Create missing Xop threads
 506          */
 507         if (pmp->mp)
 508                 hammer2_xop_helper_create(pmp);
 509
 510         hammer2_mtx_unlock(&iroot->lock);
 511         hammer2_inode_drop(iroot);
 512 done:
 513         return pmp;
 514 }
 515
 516 /*
 517  * Destroy a PFS, typically only occurs after the last mount on a device
 518  * has gone away.
 519  */
 520 static void
 521 hammer2_pfsfree(hammer2_pfs_t *pmp)
 522 {
 523         hammer2_inode_t *iroot;
 524         int i;
 525         int j;
 526
 527         /*
 528          * Cleanup our reference on iroot.  iroot is (should) not be needed
 529          * by the flush code.
 530          */
 531         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 532
 533         iroot = pmp->iroot;
 534         if (iroot) {
 535                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 536                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 537                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 538                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 539                 }
 540 #if REPORT_REFS_ERRORS
 541                 if (pmp->iroot->refs != 1)
 542                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 543                                 pmp->iroot, pmp->iroot->refs);
 544 #else
 545                 KKASSERT(pmp->iroot->refs == 1);
 546 #endif
 547                 /* ref for pmp->iroot */
 548                 hammer2_inode_drop(pmp->iroot);
 549                 pmp->iroot = NULL;
 550         }
 551
 552         kmalloc_destroy(&pmp->mmsg);
 553         kmalloc_destroy(&pmp->minode);
 554
 555         kfree(pmp, M_HAMMER2);
 556 }
 557
 558 /*
 559  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 560  * empty is terminated and freed.
 561  *
 562  * XXX inefficient.
 563  */
 564 static void
 565 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
 566 {
 567         hammer2_pfs_t *pmp;
 568         hammer2_inode_t *iroot;
 569         hammer2_chain_t *rchain;
 570         int didfreeze;
 571         int i;
 572         int j;
 573
 574 again:
 575         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 576                 if ((iroot = pmp->iroot) == NULL)
 577                         continue;
 578                 if (hmp->spmp == pmp) {
 579                         kprintf("unmount hmp %p remove spmp %p\n",
 580                                 hmp, pmp);
 581                         hmp->spmp = NULL;
 582                 }
 583
 584                 /*
 585                  * Determine if this PFS is affected.  If it is we must
 586                  * freeze all management threads and lock its iroot.
 587                  *
 588                  * Freezing a management thread forces it idle, operations
 589                  * in-progress will be aborted and it will have to start
 590                  * over again when unfrozen, or exit if told to exit.
 591                  */
 592                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 593                         if (pmp->pfs_hmps[i] == hmp)
 594                                 break;
 595                 }
 596                 if (i != HAMMER2_MAXCLUSTER) {
 597                         /*
 598                          * Make sure all synchronization threads are locked
 599                          * down.
 600                          */
 601                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 602                                 if (pmp->pfs_hmps[i] == NULL)
 603                                         continue;
 604                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 605                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 606                                         hammer2_thr_freeze_async(
 607                                                 &pmp->xop_groups[j].thrs[i]);
 608                                 }
 609                         }
 610                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 611                                 if (pmp->pfs_hmps[i] == NULL)
 612                                         continue;
 613                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 614                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 615                                         hammer2_thr_freeze(
 616                                                 &pmp->xop_groups[j].thrs[i]);
 617                                 }
 618                         }
 619
 620                         /*
 621                          * Lock the inode and clean out matching chains.
 622                          * Note that we cannot use hammer2_inode_lock_*()
 623                          * here because that would attempt to validate the
 624                          * cluster that we are in the middle of ripping
 625                          * apart.
 626                          *
 627                          * WARNING! We are working directly on the inodes
 628                          *          embedded cluster.
 629                          */
 630                         hammer2_mtx_ex(&iroot->lock);
 631
 632                         /*
 633                          * Remove the chain from matching elements of the PFS.
 634                          */
 635                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 636                                 if (pmp->pfs_hmps[i] != hmp)
 637                                         continue;
 638                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 639                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 640                                         hammer2_thr_delete(
 641                                                 &pmp->xop_groups[j].thrs[i]);
 642                                 }
 643                                 rchain = iroot->cluster.array[i].chain;
 644                                 iroot->cluster.array[i].chain = NULL;
 645                                 pmp->pfs_types[i] = 0;
 646                                 if (pmp->pfs_names[i]) {
 647                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 648                                         pmp->pfs_names[i] = NULL;
 649                                 }
 650                                 if (rchain) {
 651                                         hammer2_chain_drop(rchain);
 652                                         /* focus hint */
 653                                         if (iroot->cluster.focus == rchain)
 654                                                 iroot->cluster.focus = NULL;
 655                                 }
 656                                 pmp->pfs_hmps[i] = NULL;
 657                         }
 658                         hammer2_mtx_unlock(&iroot->lock);
 659                         didfreeze = 1;  /* remaster, unfreeze down below */
 660                 } else {
 661                         didfreeze = 0;
 662                 }
 663
 664                 /*
 665                  * Cleanup trailing chains.  Gaps may remain.
 666                  */
 667                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 668                         if (pmp->pfs_hmps[i])
 669                                 break;
 670                 }
 671                 iroot->cluster.nchains = i + 1;
 672
 673                 /*
 674                  * If the PMP has no elements remaining we can destroy it.
 675                  * (this will transition management threads from frozen->exit).
 676                  */
 677                 if (iroot->cluster.nchains == 0) {
 678                         kprintf("unmount hmp %p last ref to PMP=%p\n",
 679                                 hmp, pmp);
 680                         hammer2_pfsfree(pmp);
 681                         goto again;
 682                 }
 683
 684                 /*
 685                  * If elements still remain we need to set the REMASTER
 686                  * flag and unfreeze it.
 687                  */
 688                 if (didfreeze) {
 689                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 690                                 if (pmp->pfs_hmps[i] == NULL)
 691                                         continue;
 692                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 693                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 694                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 695                                         hammer2_thr_remaster(
 696                                                 &pmp->xop_groups[j].thrs[i]);
 697                                         hammer2_thr_unfreeze(
 698                                                 &pmp->xop_groups[j].thrs[i]);
 699                                 }
 700                         }
 701                 }
 702         }
 703 }
 704
 705 /*
 706  * Mount or remount HAMMER2 fileystem from physical media
 707  *
 708  *      mountroot
 709  *              mp              mount point structure
 710  *              path            NULL
 711  *              data            <unused>
 712  *              cred            <unused>
 713  *
 714  *      mount
 715  *              mp              mount point structure
 716  *              path            path to mount point
 717  *              data            pointer to argument structure in user space
 718  *                      volume  volume path (device@LABEL form)
 719  *                      hflags  user mount flags
 720  *              cred            user credentials
 721  *
 722  * RETURNS:     0       Success
 723  *              !0      error number
 724  */
 725 static
 726 int
 727 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 728                   struct ucred *cred)
 729 {
 730         struct hammer2_mount_info info;
 731         hammer2_pfs_t *pmp;
 732         hammer2_pfs_t *spmp;
 733         hammer2_dev_t *hmp;
 734         hammer2_key_t key_next;
 735         hammer2_key_t key_dummy;
 736         hammer2_key_t lhc;
 737         struct vnode *devvp;
 738         struct nlookupdata nd;
 739         hammer2_chain_t *parent;
 740         hammer2_chain_t *chain;
 741         hammer2_cluster_t *cluster;
 742         const hammer2_inode_data_t *ripdata;
 743         hammer2_blockref_t bref;
 744         struct file *fp;
 745         char devstr[MNAMELEN];
 746         size_t size;
 747         size_t done;
 748         char *dev;
 749         char *label;
 750         int ronly = 1;
 751         int error;
 752         int cache_index;
 753         int i;
 754
 755         hmp = NULL;
 756         pmp = NULL;
 757         dev = NULL;
 758         label = NULL;
 759         devvp = NULL;
 760         cache_index = -1;
 761
 762         kprintf("hammer2_mount\n");
 763
 764         if (path == NULL) {
 765                 /*
 766                  * Root mount
 767                  */
 768                 bzero(&info, sizeof(info));
 769                 info.cluster_fd = -1;
 770                 ksnprintf(devstr, sizeof(devstr), "%s",
 771                           mp->mnt_stat.f_mntfromname);
 772                 kprintf("hammer2_mount: root '%s'\n", devstr);
 773         } else {
 774                 /*
 775                  * Non-root mount or updating a mount
 776                  */
 777                 error = copyin(data, &info, sizeof(info));
 778                 if (error)
 779                         return (error);
 780
 781                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 782                 if (error)
 783                         return (error);
 784         }
 785
 786         /* Extract device and label */
 787         dev = devstr;
 788         label = strchr(devstr, '@');
 789         if (label == NULL ||
 790             ((label + 1) - dev) > done) {
 791                 return (EINVAL);
 792         }
 793         *label = '\0';
 794         label++;
 795         if (*label == '\0')
 796                 return (EINVAL);
 797
 798         if (mp->mnt_flag & MNT_UPDATE) {
 799                 /*
 800                  * Update mount.  Note that pmp->iroot->cluster is
 801                  * an inode-embedded cluster and thus cannot be
 802                  * directly locked.
 803                  *
 804                  * XXX HAMMER2 needs to implement NFS export via
 805                  *     mountctl.
 806                  */
 807                 pmp = MPTOPMP(mp);
 808                 cluster = &pmp->iroot->cluster;
 809                 for (i = 0; i < cluster->nchains; ++i) {
 810                         if (cluster->array[i].chain == NULL)
 811                                 continue;
 812                         hmp = cluster->array[i].chain->hmp;
 813                         devvp = hmp->devvp;
 814                         error = hammer2_remount(hmp, mp, path,
 815                                                 devvp, cred);
 816                         if (error)
 817                                 break;
 818                 }
 819
 820                 return error;
 821         }
 822
 823         /*
 824          * HMP device mount
 825          *
 826          * Lookup name and verify it refers to a block device.
 827          */
 828         if (path) {
 829                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 830                 if (error == 0)
 831                         error = nlookup(&nd);
 832                 if (error == 0)
 833                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 834                 nlookup_done(&nd);
 835         } else {
 836                 /* root mount */
 837                 cdev_t cdev = kgetdiskbyname(dev);
 838                 error = bdevvp(cdev, &devvp);
 839                 if (error)
 840                         kprintf("hammer2: cannot find '%s'\n", dev);
 841         }
 842
 843         if (error == 0) {
 844                 if (vn_isdisk(devvp, &error))
 845                         error = vfs_mountedon(devvp);
 846         }
 847
 848         /*
 849          * Determine if the device has already been mounted.  After this
 850          * check hmp will be non-NULL if we are doing the second or more
 851          * hammer2 mounts from the same device.
 852          */
 853         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 854         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 855                 if (hmp->devvp == devvp)
 856                         break;
 857         }
 858
 859         /*
 860          * Open the device if this isn't a secondary mount and construct
 861          * the H2 device mount (hmp).
 862          */
 863         if (hmp == NULL) {
 864                 hammer2_chain_t *schain;
 865                 hammer2_xid_t xid;
 866
 867                 if (error == 0 && vcount(devvp) > 0)
 868                         error = EBUSY;
 869
 870                 /*
 871                  * Now open the device
 872                  */
 873                 if (error == 0) {
 874                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 875                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 876                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 877                         if (error == 0) {
 878                                 error = VOP_OPEN(devvp,
 879                                                  ronly ? FREAD : FREAD | FWRITE,
 880                                                  FSCRED, NULL);
 881                         }
 882                         vn_unlock(devvp);
 883                 }
 884                 if (error && devvp) {
 885                         vrele(devvp);
 886                         devvp = NULL;
 887                 }
 888                 if (error) {
 889                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 890                         return error;
 891                 }
 892                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 893                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
 894                 hmp->ronly = ronly;
 895                 hmp->devvp = devvp;
 896                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 897                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 898                 RB_INIT(&hmp->iotree);
 899                 spin_init(&hmp->io_spin, "hm2mount_io");
 900                 spin_init(&hmp->list_spin, "hm2mount_list");
 901                 TAILQ_INIT(&hmp->flushq);
 902
 903                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 904                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
 905
 906                 /*
 907                  * vchain setup. vchain.data is embedded.
 908                  * vchain.refs is initialized and will never drop to 0.
 909                  *
 910                  * NOTE! voldata is not yet loaded.
 911                  */
 912                 hmp->vchain.hmp = hmp;
 913                 hmp->vchain.refs = 1;
 914                 hmp->vchain.data = (void *)&hmp->voldata;
 915                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 916                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 917                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 918
 919                 hammer2_chain_core_init(&hmp->vchain);
 920                 /* hmp->vchain.u.xxx is left NULL */
 921
 922                 /*
 923                  * fchain setup.  fchain.data is embedded.
 924                  * fchain.refs is initialized and will never drop to 0.
 925                  *
 926                  * The data is not used but needs to be initialized to
 927                  * pass assertion muster.  We use this chain primarily
 928                  * as a placeholder for the freemap's top-level RBTREE
 929                  * so it does not interfere with the volume's topology
 930                  * RBTREE.
 931                  */
 932                 hmp->fchain.hmp = hmp;
 933                 hmp->fchain.refs = 1;
 934                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 935                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 936                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 937                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 938                 hmp->fchain.bref.methods =
 939                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 940                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 941
 942                 hammer2_chain_core_init(&hmp->fchain);
 943                 /* hmp->fchain.u.xxx is left NULL */
 944
 945                 /*
 946                  * Install the volume header and initialize fields from
 947                  * voldata.
 948                  */
 949                 error = hammer2_install_volume_header(hmp);
 950                 if (error) {
 951                         hammer2_unmount_helper(mp, NULL, hmp);
 952                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 953                         hammer2_vfs_unmount(mp, MNT_FORCE);
 954                         return error;
 955                 }
 956
 957                 /*
 958                  * Really important to get these right or flush will get
 959                  * confused.
 960                  */
 961                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0);
 962                 kprintf("alloc spmp %p tid %016jx\n",
 963                         hmp->spmp, hmp->voldata.mirror_tid);
 964                 spmp = hmp->spmp;
 965
 966                 /*
 967                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
 968                  * is inherited from the volume header.
 969                  */
 970                 xid = 0;
 971                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 972                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 973                 hmp->vchain.pmp = spmp;
 974                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 975                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 976                 hmp->fchain.pmp = spmp;
 977
 978                 /*
 979                  * First locate the super-root inode, which is key 0
 980                  * relative to the volume header's blockset.
 981                  *
 982                  * Then locate the root inode by scanning the directory keyspace
 983                  * represented by the label.
 984                  */
 985                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 986                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 987                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 988                                       &cache_index, 0);
 989                 hammer2_chain_lookup_done(parent);
 990                 if (schain == NULL) {
 991                         kprintf("hammer2_mount: invalid super-root\n");
 992                         hammer2_unmount_helper(mp, NULL, hmp);
 993                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 994                         hammer2_vfs_unmount(mp, MNT_FORCE);
 995                         return EINVAL;
 996                 }
 997                 if (schain->error) {
 998                         kprintf("hammer2_mount: error %s reading super-root\n",
 999                                 hammer2_error_str(schain->error));
1000                         hammer2_chain_unlock(schain);
1001                         hammer2_chain_drop(schain);
1002                         schain = NULL;
1003                         hammer2_unmount_helper(mp, NULL, hmp);
1004                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1005                         hammer2_vfs_unmount(mp, MNT_FORCE);
1006                         return EINVAL;
1007                 }
1008
1009                 /*
1010                  * The super-root always uses an inode_tid of 1 when
1011                  * creating PFSs.
1012                  */
1013                 spmp->inode_tid = 1;
1014                 spmp->modify_tid = schain->bref.modify_tid + 1;
1015
1016                 /*
1017                  * Sanity-check schain's pmp and finish initialization.
1018                  * Any chain belonging to the super-root topology should
1019                  * have a NULL pmp (not even set to spmp).
1020                  */
1021                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1022                 KKASSERT(schain->pmp == NULL);
1023                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1024
1025                 /*
1026                  * Replace the dummy spmp->iroot with a real one.  It's
1027                  * easier to just do a wholesale replacement than to try
1028                  * to update the chain and fixup the iroot fields.
1029                  *
1030                  * The returned inode is locked with the supplied cluster.
1031                  */
1032                 cluster = hammer2_cluster_from_chain(schain);
1033                 hammer2_inode_drop(spmp->iroot);
1034                 spmp->iroot = NULL;
1035                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1036                 spmp->spmp_hmp = hmp;
1037                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1038                 spmp->pfs_hmps[0] = hmp;
1039                 hammer2_inode_ref(spmp->iroot);
1040                 hammer2_inode_unlock(spmp->iroot);
1041                 hammer2_cluster_unlock(cluster);
1042                 hammer2_cluster_drop(cluster);
1043                 schain = NULL;
1044                 /* leave spmp->iroot with one ref */
1045
1046                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1047                         error = hammer2_recovery(hmp);
1048                         /* XXX do something with error */
1049                 }
1050                 hammer2_update_pmps(hmp);
1051                 hammer2_iocom_init(hmp);
1052
1053                 /*
1054                  * Ref the cluster management messaging descriptor.  The mount
1055                  * program deals with the other end of the communications pipe.
1056                  *
1057                  * Root mounts typically do not supply one.
1058                  */
1059                 if (info.cluster_fd >= 0) {
1060                         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1061                         if (fp) {
1062                                 hammer2_cluster_reconnect(hmp, fp);
1063                         } else {
1064                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1065                         }
1066                 }
1067         } else {
1068                 spmp = hmp->spmp;
1069         }
1070
1071         /*
1072          * Lookup the mount point under the media-localized super-root.
1073          * Scanning hammer2_pfslist doesn't help us because it represents
1074          * PFS cluster ids which can aggregate several named PFSs together.
1075          *
1076          * cluster->pmp will incorrectly point to spmp and must be fixed
1077          * up later on.
1078          */
1079         hammer2_inode_lock(spmp->iroot, 0);
1080         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1081         lhc = hammer2_dirhash(label, strlen(label));
1082         chain = hammer2_chain_lookup(&parent, &key_next,
1083                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1084                                      &cache_index, 0);
1085         while (chain) {
1086                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1087                     strcmp(label, chain->data->ipdata.filename) == 0) {
1088                         break;
1089                 }
1090                 chain = hammer2_chain_next(&parent, chain, &key_next,
1091                                             key_next,
1092                                             lhc + HAMMER2_DIRHASH_LOMASK,
1093                                             &cache_index, 0);
1094         }
1095         if (parent) {
1096                 hammer2_chain_unlock(parent);
1097                 hammer2_chain_drop(parent);
1098         }
1099         hammer2_inode_unlock(spmp->iroot);
1100
1101         /*
1102          * PFS could not be found?
1103          */
1104         if (chain == NULL) {
1105                 kprintf("hammer2_mount: PFS label not found\n");
1106                 hammer2_unmount_helper(mp, NULL, hmp);
1107                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1108                 hammer2_vfs_unmount(mp, MNT_FORCE);
1109
1110                 return EINVAL;
1111         }
1112
1113         /*
1114          * Acquire the pmp structure (it should have already been allocated
1115          * via hammer2_update_pmps() so do not pass cluster in to add to
1116          * available chains).
1117          *
1118          * Check if the cluster has already been mounted.  A cluster can
1119          * only be mounted once, use null mounts to mount additional copies.
1120          */
1121         ripdata = &chain->data->ipdata;
1122         bref = chain->bref;
1123         pmp = hammer2_pfsalloc(NULL, ripdata, bref.modify_tid);
1124         hammer2_chain_unlock(chain);
1125         hammer2_chain_drop(chain);
1126
1127         if (pmp->mp) {
1128                 kprintf("hammer2_mount: PFS already mounted!\n");
1129                 hammer2_unmount_helper(mp, NULL, hmp);
1130                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1131                 hammer2_vfs_unmount(mp, MNT_FORCE);
1132
1133                 return EBUSY;
1134         }
1135
1136         /*
1137          * Finish the mount
1138          */
1139         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1140
1141         mp->mnt_flag = MNT_LOCAL;
1142         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1143         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1144
1145         /*
1146          * required mount structure initializations
1147          */
1148         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1149         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1150
1151         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1152         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1153
1154         /*
1155          * Optional fields
1156          */
1157         mp->mnt_iosize_max = MAXPHYS;
1158
1159         /*
1160          * Connect up mount pointers.
1161          */
1162         hammer2_mount_helper(mp, pmp);
1163
1164         lockmgr(&hammer2_mntlk, LK_RELEASE);
1165
1166         /*
1167          * Finish setup
1168          */
1169         vfs_getnewfsid(mp);
1170         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1171         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1172         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1173
1174         if (path) {
1175                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1176                           MNAMELEN - 1, &size);
1177                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1178         } /* else root mount, already in there */
1179
1180         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1181         if (path) {
1182                 copyinstr(path, mp->mnt_stat.f_mntonname,
1183                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1184                           &size);
1185         } else {
1186                 /* root mount */
1187                 mp->mnt_stat.f_mntonname[0] = '/';
1188         }
1189
1190         /*
1191          * Initial statfs to prime mnt_stat.
1192          */
1193         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1194
1195         return 0;
1196 }
1197
1198 /*
1199  * Scan PFSs under the super-root and create hammer2_pfs structures.
1200  */
1201 static
1202 void
1203 hammer2_update_pmps(hammer2_dev_t *hmp)
1204 {
1205         const hammer2_inode_data_t *ripdata;
1206         hammer2_chain_t *parent;
1207         hammer2_chain_t *chain;
1208         hammer2_blockref_t bref;
1209         hammer2_pfs_t *spmp;
1210         hammer2_pfs_t *pmp;
1211         hammer2_key_t key_next;
1212         int cache_index = -1;
1213
1214         /*
1215          * Lookup mount point under the media-localized super-root.
1216          *
1217          * cluster->pmp will incorrectly point to spmp and must be fixed
1218          * up later on.
1219          */
1220         spmp = hmp->spmp;
1221         hammer2_inode_lock(spmp->iroot, 0);
1222         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1223         chain = hammer2_chain_lookup(&parent, &key_next,
1224                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1225                                          &cache_index, 0);
1226         while (chain) {
1227                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1228                         continue;
1229                 ripdata = &chain->data->ipdata;
1230                 bref = chain->bref;
1231                 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1232
1233                 pmp = hammer2_pfsalloc(chain, ripdata, bref.modify_tid);
1234                 chain = hammer2_chain_next(&parent, chain, &key_next,
1235                                            key_next, HAMMER2_KEY_MAX,
1236                                            &cache_index, 0);
1237         }
1238         if (parent) {
1239                 hammer2_chain_unlock(parent);
1240                 hammer2_chain_drop(parent);
1241         }
1242         hammer2_inode_unlock(spmp->iroot);
1243 }
1244
1245 static
1246 int
1247 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1248                 struct vnode *devvp, struct ucred *cred)
1249 {
1250         int error;
1251
1252         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1253                 error = hammer2_recovery(hmp);
1254         } else {
1255                 error = 0;
1256         }
1257         return error;
1258 }
1259
1260 static
1261 int
1262 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1263 {
1264         hammer2_pfs_t *pmp;
1265         int flags;
1266         int error = 0;
1267
1268         pmp = MPTOPMP(mp);
1269
1270         if (pmp == NULL)
1271                 return(0);
1272
1273         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1274
1275         /*
1276          * If mount initialization proceeded far enough we must flush
1277          * its vnodes and sync the underlying mount points.  Three syncs
1278          * are required to fully flush the filesystem (freemap updates lag
1279          * by one flush, and one extra for safety).
1280          */
1281         if (mntflags & MNT_FORCE)
1282                 flags = FORCECLOSE;
1283         else
1284                 flags = 0;
1285         if (pmp->iroot) {
1286                 error = vflush(mp, 0, flags);
1287                 if (error)
1288                         goto failed;
1289                 hammer2_vfs_sync(mp, MNT_WAIT);
1290                 hammer2_vfs_sync(mp, MNT_WAIT);
1291                 hammer2_vfs_sync(mp, MNT_WAIT);
1292         }
1293
1294         /*
1295          * Cleanup the frontend support XOPS threads
1296          */
1297         hammer2_xop_helper_cleanup(pmp);
1298
1299         /*
1300          * Cleanup our reference on ihidden.
1301          */
1302         if (pmp->ihidden) {
1303                 hammer2_inode_drop(pmp->ihidden);
1304                 pmp->ihidden = NULL;
1305         }
1306         if (pmp->mp)
1307                 hammer2_unmount_helper(mp, pmp, NULL);
1308
1309         error = 0;
1310 failed:
1311         lockmgr(&hammer2_mntlk, LK_RELEASE);
1312
1313         return (error);
1314 }
1315
1316 /*
1317  * Mount helper, hook the system mount into our PFS.
1318  * The mount lock is held.
1319  *
1320  * We must bump the mount_count on related devices for any
1321  * mounted PFSs.
1322  */
1323 static
1324 void
1325 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1326 {
1327         hammer2_cluster_t *cluster;
1328         hammer2_chain_t *rchain;
1329         int i;
1330
1331         mp->mnt_data = (qaddr_t)pmp;
1332         pmp->mp = mp;
1333
1334         /*
1335          * After pmp->mp is set we have to adjust hmp->mount_count.
1336          */
1337         cluster = &pmp->iroot->cluster;
1338         for (i = 0; i < cluster->nchains; ++i) {
1339                 rchain = cluster->array[i].chain;
1340                 if (rchain == NULL)
1341                         continue;
1342                 ++rchain->hmp->mount_count;
1343                 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1344                         rchain->hmp, rchain->hmp->mount_count);
1345         }
1346
1347         /*
1348          * Create missing Xop threads
1349          */
1350         hammer2_xop_helper_create(pmp);
1351 }
1352
1353 /*
1354  * Mount helper, unhook the system mount from our PFS.
1355  * The mount lock is held.
1356  *
1357  * If hmp is supplied a mount responsible for being the first to open
1358  * the block device failed and the block device and all PFSs using the
1359  * block device must be cleaned up.
1360  *
1361  * If pmp is supplied multiple devices might be backing the PFS and each
1362  * must be disconnect.  This might not be the last PFS using some of the
1363  * underlying devices.  Also, we have to adjust our hmp->mount_count
1364  * accounting for the devices backing the pmp which is now undergoing an
1365  * unmount.
1366  */
1367 static
1368 void
1369 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1370 {
1371         hammer2_cluster_t *cluster;
1372         hammer2_chain_t *rchain;
1373         struct vnode *devvp;
1374         int dumpcnt;
1375         int ronly = 0;
1376         int i;
1377
1378         /*
1379          * If no device supplied this is a high-level unmount and we have to
1380          * to disconnect the mount, adjust mount_count, and locate devices
1381          * that might now have no mounts.
1382          */
1383         if (pmp) {
1384                 KKASSERT(hmp == NULL);
1385                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1386                 pmp->mp = NULL;
1387                 mp->mnt_data = NULL;
1388
1389                 /*
1390                  * After pmp->mp is cleared we have to account for
1391                  * mount_count.
1392                  */
1393                 cluster = &pmp->iroot->cluster;
1394                 for (i = 0; i < cluster->nchains; ++i) {
1395                         rchain = cluster->array[i].chain;
1396                         if (rchain == NULL)
1397                                 continue;
1398                         --rchain->hmp->mount_count;
1399                         kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1400                                 rchain->hmp, rchain->hmp->mount_count);
1401                         /* scrapping hmp now may invalidate the pmp */
1402                 }
1403 again:
1404                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1405                         if (hmp->mount_count == 0) {
1406                                 hammer2_unmount_helper(NULL, NULL, hmp);
1407                                 goto again;
1408                         }
1409                 }
1410                 return;
1411         }
1412
1413         /*
1414          * Try to terminate the block device.  We can't terminate it if
1415          * there are still PFSs referencing it.
1416          */
1417         kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1418                 hmp, hmp->mount_count);
1419         if (hmp->mount_count)
1420                 return;
1421
1422         hammer2_pfsfree_scan(hmp);
1423         hammer2_dev_exlock(hmp);        /* XXX order */
1424
1425         /*
1426          * Cycle the volume data lock as a safety (probably not needed any
1427          * more).  To ensure everything is out we need to flush at least
1428          * three times.  (1) The running of the unlinkq can dirty the
1429          * filesystem, (2) A normal flush can dirty the freemap, and
1430          * (3) ensure that the freemap is fully synchronized.
1431          *
1432          * The next mount's recovery scan can clean everything up but we want
1433          * to leave the filesystem in a 100% clean state on a normal unmount.
1434          */
1435 #if 0
1436         hammer2_voldata_lock(hmp);
1437         hammer2_voldata_unlock(hmp);
1438 #endif
1439         hammer2_iocom_uninit(hmp);
1440
1441         if ((hmp->vchain.flags | hmp->fchain.flags) &
1442             HAMMER2_CHAIN_FLUSH_MASK) {
1443                 kprintf("hammer2_unmount: chains left over "
1444                         "after final sync\n");
1445                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1446                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1447
1448                 if (hammer2_debug & 0x0010)
1449                         Debugger("entered debugger");
1450         }
1451
1452         KKASSERT(hmp->spmp == NULL);
1453
1454         /*
1455          * Finish up with the device vnode
1456          */
1457         if ((devvp = hmp->devvp) != NULL) {
1458                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1459                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1460                 hmp->devvp = NULL;
1461                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1462                 vn_unlock(devvp);
1463                 vrele(devvp);
1464                 devvp = NULL;
1465         }
1466
1467         /*
1468          * Clear vchain/fchain flags that might prevent final cleanup
1469          * of these chains.
1470          */
1471         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1472                 atomic_clear_int(&hmp->vchain.flags,
1473                                  HAMMER2_CHAIN_MODIFIED);
1474                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1475                 hammer2_chain_drop(&hmp->vchain);
1476         }
1477         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1478                 atomic_clear_int(&hmp->vchain.flags,
1479                                  HAMMER2_CHAIN_UPDATE);
1480                 hammer2_chain_drop(&hmp->vchain);
1481         }
1482
1483         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1484                 atomic_clear_int(&hmp->fchain.flags,
1485                                  HAMMER2_CHAIN_MODIFIED);
1486                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1487                 hammer2_chain_drop(&hmp->fchain);
1488         }
1489         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1490                 atomic_clear_int(&hmp->fchain.flags,
1491                                  HAMMER2_CHAIN_UPDATE);
1492                 hammer2_chain_drop(&hmp->fchain);
1493         }
1494
1495         /*
1496          * Final drop of embedded freemap root chain to
1497          * clean up fchain.core (fchain structure is not
1498          * flagged ALLOCATED so it is cleaned out and then
1499          * left to rot).
1500          */
1501         hammer2_chain_drop(&hmp->fchain);
1502
1503         /*
1504          * Final drop of embedded volume root chain to clean
1505          * up vchain.core (vchain structure is not flagged
1506          * ALLOCATED so it is cleaned out and then left to
1507          * rot).
1508          */
1509         dumpcnt = 50;
1510         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1511         dumpcnt = 50;
1512         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1513         hammer2_dev_unlock(hmp);
1514         hammer2_chain_drop(&hmp->vchain);
1515
1516         hammer2_io_cleanup(hmp, &hmp->iotree);
1517         if (hmp->iofree_count) {
1518                 kprintf("io_cleanup: %d I/O's left hanging\n",
1519                         hmp->iofree_count);
1520         }
1521
1522         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1523         kmalloc_destroy(&hmp->mchain);
1524         kfree(hmp, M_HAMMER2);
1525 }
1526
1527 static
1528 int
1529 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1530              ino_t ino, struct vnode **vpp)
1531 {
1532         kprintf("hammer2_vget\n");
1533         return (EOPNOTSUPP);
1534 }
1535
1536 static
1537 int
1538 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1539 {
1540         hammer2_pfs_t *pmp;
1541         int error;
1542         struct vnode *vp;
1543
1544         pmp = MPTOPMP(mp);
1545         if (pmp->iroot == NULL) {
1546                 *vpp = NULL;
1547                 return EINVAL;
1548         }
1549
1550         error = 0;
1551         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1552
1553         while (pmp->inode_tid == 0) {
1554                 hammer2_xop_ipcluster_t *xop;
1555                 hammer2_inode_meta_t *meta;
1556
1557                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1558                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1559                 error = hammer2_xop_collect(&xop->head, 0);
1560
1561                 if (error == 0) {
1562                         meta = &xop->head.cluster.focus->data->ipdata.meta;
1563                         pmp->iroot->meta = *meta;
1564                         pmp->inode_tid = meta->pfs_inum + 1;
1565                         if (pmp->inode_tid < HAMMER2_INODE_START)
1566                                 pmp->inode_tid = HAMMER2_INODE_START;
1567                         pmp->modify_tid =
1568                                 xop->head.cluster.focus->bref.modify_tid + 1;
1569                         kprintf("PFS: Starting inode %jd\n",
1570                                 (intmax_t)pmp->inode_tid);
1571                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1572                                 pmp->inode_tid, pmp->modify_tid);
1573                         wakeup(&pmp->iroot);
1574
1575                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1576
1577                         /*
1578                          * Prime the mount info.
1579                          */
1580                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1581
1582                         /*
1583                          * With the cluster operational, check for and
1584                          * install ihidden if needed.  The install_hidden
1585                          * code needs to get a transaction so we must unlock
1586                          * iroot around it.
1587                          *
1588                          * This is only applicable PFS mounts, there is no
1589                          * hidden directory in the spmp.
1590                          */
1591                         hammer2_inode_unlock(pmp->iroot);
1592                         hammer2_inode_install_hidden(pmp);
1593                         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1594
1595                         break;
1596                 }
1597
1598                 /*
1599                  * Loop, try again
1600                  */
1601                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1602                 hammer2_inode_unlock(pmp->iroot);
1603                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1604                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1605                 if (error == EINTR)
1606                         break;
1607         }
1608
1609         if (error) {
1610                 hammer2_inode_unlock(pmp->iroot);
1611                 *vpp = NULL;
1612         } else {
1613                 vp = hammer2_igetv(pmp->iroot, &error);
1614                 hammer2_inode_unlock(pmp->iroot);
1615                 *vpp = vp;
1616         }
1617
1618         return (error);
1619 }
1620
1621 /*
1622  * Filesystem status
1623  *
1624  * XXX incorporate ipdata->meta.inode_quota and data_quota
1625  */
1626 static
1627 int
1628 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1629 {
1630         hammer2_pfs_t *pmp;
1631         hammer2_dev_t *hmp;
1632         hammer2_blockref_t bref;
1633         int i;
1634
1635         /*
1636          * NOTE: iroot might not have validated the cluster yet.
1637          */
1638         pmp = MPTOPMP(mp);
1639
1640         mp->mnt_stat.f_files = 0;
1641         mp->mnt_stat.f_ffree = 0;
1642         mp->mnt_stat.f_blocks = 0;
1643         mp->mnt_stat.f_bfree = 0;
1644         mp->mnt_stat.f_bavail = 0;
1645
1646         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1647                 hmp = pmp->pfs_hmps[i];
1648                 if (hmp == NULL)
1649                         continue;
1650                 if (pmp->iroot->cluster.array[i].chain)
1651                         bref = pmp->iroot->cluster.array[i].chain->bref;
1652                 else
1653                         bzero(&bref, sizeof(bref));
1654
1655                 mp->mnt_stat.f_files = bref.inode_count;
1656                 mp->mnt_stat.f_ffree = 0;
1657                 mp->mnt_stat.f_blocks = (bref.data_count +
1658                                          hmp->voldata.allocator_free) /
1659                                         mp->mnt_vstat.f_bsize;
1660                 mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free /
1661                                         mp->mnt_vstat.f_bsize;
1662                 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1663
1664                 *sbp = mp->mnt_stat;
1665         }
1666         return (0);
1667 }
1668
1669 static
1670 int
1671 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1672 {
1673         hammer2_pfs_t *pmp;
1674         hammer2_dev_t *hmp;
1675         hammer2_blockref_t bref;
1676         int i;
1677
1678         /*
1679          * NOTE: iroot might not have validated the cluster yet.
1680          */
1681         pmp = MPTOPMP(mp);
1682
1683         mp->mnt_vstat.f_bsize = 0;
1684         mp->mnt_vstat.f_files = 0;
1685         mp->mnt_vstat.f_ffree = 0;
1686         mp->mnt_vstat.f_blocks = 0;
1687         mp->mnt_vstat.f_bfree = 0;
1688         mp->mnt_vstat.f_bavail = 0;
1689
1690         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1691                 hmp = pmp->pfs_hmps[i];
1692                 if (hmp == NULL)
1693                         continue;
1694                 if (pmp->iroot->cluster.array[i].chain)
1695                         bref = pmp->iroot->cluster.array[i].chain->bref;
1696                 else
1697                         bzero(&bref, sizeof(bref));
1698
1699                 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1700                 mp->mnt_vstat.f_files = bref.inode_count;
1701                 mp->mnt_vstat.f_ffree = 0;
1702                 mp->mnt_vstat.f_blocks = (bref.data_count +
1703                                          hmp->voldata.allocator_free) /
1704                                         mp->mnt_vstat.f_bsize;
1705                 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1706                                         mp->mnt_vstat.f_bsize;
1707                 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1708
1709                 *sbp = mp->mnt_vstat;
1710         }
1711         return (0);
1712 }
1713
1714 /*
1715  * Mount-time recovery (RW mounts)
1716  *
1717  * Updates to the free block table are allowed to lag flushes by one
1718  * transaction.  In case of a crash, then on a fresh mount we must do an
1719  * incremental scan of the last committed transaction id and make sure that
1720  * all related blocks have been marked allocated.
1721  *
1722  * The super-root topology and each PFS has its own transaction id domain,
1723  * so we must track PFS boundary transitions.
1724  */
1725 struct hammer2_recovery_elm {
1726         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1727         hammer2_chain_t *chain;
1728         hammer2_tid_t sync_tid;
1729 };
1730
1731 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1732
1733 struct hammer2_recovery_info {
1734         struct hammer2_recovery_list list;
1735         hammer2_tid_t   mtid;
1736         int     depth;
1737 };
1738
1739 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
1740                         hammer2_chain_t *parent,
1741                         struct hammer2_recovery_info *info,
1742                         hammer2_tid_t sync_tid);
1743
1744 #define HAMMER2_RECOVERY_MAXDEPTH       10
1745
1746 static
1747 int
1748 hammer2_recovery(hammer2_dev_t *hmp)
1749 {
1750         struct hammer2_recovery_info info;
1751         struct hammer2_recovery_elm *elm;
1752         hammer2_chain_t *parent;
1753         hammer2_tid_t sync_tid;
1754         hammer2_tid_t mirror_tid;
1755         int error;
1756         int cumulative_error = 0;
1757
1758         hammer2_trans_init(hmp->spmp, 0);
1759
1760         sync_tid = hmp->voldata.freemap_tid;
1761         mirror_tid = hmp->voldata.mirror_tid;
1762
1763         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
1764         if (sync_tid >= mirror_tid) {
1765                 kprintf(" no recovery needed\n");
1766         } else {
1767                 kprintf(" freemap recovery %016jx-%016jx\n",
1768                         sync_tid + 1, mirror_tid);
1769         }
1770
1771         TAILQ_INIT(&info.list);
1772         info.depth = 0;
1773         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1774         cumulative_error = hammer2_recovery_scan(hmp, parent,
1775                                                  &info, sync_tid);
1776         hammer2_chain_lookup_done(parent);
1777
1778         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1779                 TAILQ_REMOVE(&info.list, elm, entry);
1780                 parent = elm->chain;
1781                 sync_tid = elm->sync_tid;
1782                 kfree(elm, M_HAMMER2);
1783
1784                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1785                 error = hammer2_recovery_scan(hmp, parent,
1786                                               &info, hmp->voldata.freemap_tid);
1787                 hammer2_chain_unlock(parent);
1788                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
1789                 if (error)
1790                         cumulative_error = error;
1791         }
1792         hammer2_trans_done(hmp->spmp);
1793
1794         return cumulative_error;
1795 }
1796
1797 static
1798 int
1799 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
1800                       struct hammer2_recovery_info *info,
1801                       hammer2_tid_t sync_tid)
1802 {
1803         const hammer2_inode_data_t *ripdata;
1804         hammer2_chain_t *chain;
1805         int cache_index;
1806         int cumulative_error = 0;
1807         int error;
1808
1809         /*
1810          * Adjust freemap to ensure that the block(s) are marked allocated.
1811          */
1812         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1813                 hammer2_freemap_adjust(hmp, &parent->bref,
1814                                        HAMMER2_FREEMAP_DORECOVER);
1815         }
1816
1817         /*
1818          * Check type for recursive scan
1819          */
1820         switch(parent->bref.type) {
1821         case HAMMER2_BREF_TYPE_VOLUME:
1822                 /* data already instantiated */
1823                 break;
1824         case HAMMER2_BREF_TYPE_INODE:
1825                 /*
1826                  * Must instantiate data for DIRECTDATA test and also
1827                  * for recursion.
1828                  */
1829                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1830                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
1831                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
1832                         /* not applicable to recovery scan */
1833                         hammer2_chain_unlock(parent);
1834                         return 0;
1835                 }
1836                 hammer2_chain_unlock(parent);
1837                 break;
1838         case HAMMER2_BREF_TYPE_INDIRECT:
1839                 /*
1840                  * Must instantiate data for recursion
1841                  */
1842                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1843                 hammer2_chain_unlock(parent);
1844                 break;
1845         case HAMMER2_BREF_TYPE_DATA:
1846         case HAMMER2_BREF_TYPE_FREEMAP:
1847         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1848         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1849                 /* not applicable to recovery scan */
1850                 return 0;
1851                 break;
1852         default:
1853                 return EDOM;
1854         }
1855
1856         /*
1857          * Defer operation if depth limit reached or if we are crossing a
1858          * PFS boundary.
1859          */
1860         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
1861                 struct hammer2_recovery_elm *elm;
1862
1863                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
1864                 elm->chain = parent;
1865                 elm->sync_tid = sync_tid;
1866                 hammer2_chain_ref(parent);
1867                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
1868                 /* unlocked by caller */
1869
1870                 return(0);
1871         }
1872
1873
1874         /*
1875          * Recursive scan of the last flushed transaction only.  We are
1876          * doing this without pmp assignments so don't leave the chains
1877          * hanging around after we are done with them.
1878          */
1879         cache_index = 0;
1880         chain = hammer2_chain_scan(parent, NULL, &cache_index,
1881                                    HAMMER2_LOOKUP_NODATA);
1882         while (chain) {
1883                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
1884                 if (chain->bref.mirror_tid > sync_tid) {
1885                         ++info->depth;
1886                         error = hammer2_recovery_scan(hmp, chain,
1887                                                       info, sync_tid);
1888                         --info->depth;
1889                         if (error)
1890                                 cumulative_error = error;
1891                 }
1892
1893                 /*
1894                  * Flush the recovery at the PFS boundary to stage it for
1895                  * the final flush of the super-root topology.
1896                  */
1897                 if ((chain->bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
1898                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
1899                         hammer2_flush(chain, HAMMER2_FLUSH_TOP);
1900                 }
1901                 chain = hammer2_chain_scan(parent, chain, &cache_index,
1902                                            HAMMER2_LOOKUP_NODATA);
1903         }
1904
1905         return cumulative_error;
1906 }
1907
1908 /*
1909  * Sync a mount point; this is called on a per-mount basis from the
1910  * filesystem syncer process periodically and whenever a user issues
1911  * a sync.
1912  */
1913 int
1914 hammer2_vfs_sync(struct mount *mp, int waitfor)
1915 {
1916         hammer2_xop_flush_t *xop;
1917         struct hammer2_sync_info info;
1918         hammer2_inode_t *iroot;
1919         hammer2_pfs_t *pmp;
1920         int flags;
1921         int error;
1922
1923         pmp = MPTOPMP(mp);
1924         iroot = pmp->iroot;
1925         KKASSERT(iroot);
1926         KKASSERT(iroot->pmp == pmp);
1927
1928         /*
1929          * We can't acquire locks on existing vnodes while in a transaction
1930          * without risking a deadlock.  This assumes that vfsync() can be
1931          * called without the vnode locked (which it can in DragonFly).
1932          * Otherwise we'd have to implement a multi-pass or flag the lock
1933          * failures and retry.
1934          *
1935          * The reclamation code interlocks with the sync list's token
1936          * (by removing the vnode from the scan list) before unlocking
1937          * the inode, giving us time to ref the inode.
1938          */
1939         /*flags = VMSC_GETVP;*/
1940         flags = 0;
1941         if (waitfor & MNT_LAZY)
1942                 flags |= VMSC_ONEPASS;
1943
1944 #if 0
1945         /*
1946          * Preflush the vnodes using a normal transaction before interlocking
1947          * with a flush transaction.
1948          */
1949         hammer2_trans_init(pmp, 0);
1950         info.error = 0;
1951         info.waitfor = MNT_NOWAIT;
1952         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
1953         hammer2_trans_done(pmp);
1954 #endif
1955
1956         /*
1957          * Start our flush transaction.  This does not return until all
1958          * concurrent transactions have completed and will prevent any
1959          * new transactions from running concurrently, except for the
1960          * buffer cache transactions.
1961          *
1962          * For efficiency do an async pass before making sure with a
1963          * synchronous pass on all related buffer cache buffers.  It
1964          * should theoretically not be possible for any new file buffers
1965          * to be instantiated during this sequence.
1966          */
1967         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH |
1968                                 HAMMER2_TRANS_PREFLUSH);
1969         hammer2_inode_run_unlinkq(pmp);
1970
1971         info.error = 0;
1972         info.waitfor = MNT_NOWAIT;
1973         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
1974         info.waitfor = MNT_WAIT;
1975         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
1976
1977         /*
1978          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
1979          * buffer cache flushes which occur during the flush.  Device buffers
1980          * are not affected.
1981          */
1982         hammer2_bioq_sync(pmp);
1983         hammer2_trans_clear_preflush(pmp);
1984
1985         /*
1986          * Use the XOP interface to concurrently flush all nodes to
1987          * synchronize the PFSROOT subtopology to the media.  A standard
1988          * end-of-scan ENOENT error indicates cluster sufficiency.
1989          *
1990          * Note that this flush will not be visible on crash recovery until
1991          * we flush the super-root topology in the next loop.
1992          *
1993          * XXX For now wait for all flushes to complete.
1994          */
1995         if (iroot) {
1996                 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
1997                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
1998                 error = hammer2_xop_collect(&xop->head,
1999                                             HAMMER2_XOP_COLLECT_WAITALL);
2000                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2001                 if (error == ENOENT)
2002                         error = 0;
2003         } else {
2004                 error = 0;
2005         }
2006         hammer2_trans_done(pmp);
2007
2008         return (error);
2009 }
2010
2011 /*
2012  * Sync passes.
2013  *
2014  * Note that we ignore the tranasction mtid we got above.  Instead,
2015  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2016  * transactions.
2017  */
2018 static int
2019 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2020 {
2021         struct hammer2_sync_info *info = data;
2022         hammer2_inode_t *ip;
2023         int error;
2024
2025         /*
2026          * Degenerate cases.  Note that ip == NULL typically means the
2027          * syncer vnode itself and we don't want to vclrisdirty() in that
2028          * situation.
2029          */
2030         ip = VTOI(vp);
2031         if (ip == NULL) {
2032                 return(0);
2033         }
2034         if (vp->v_type == VNON || vp->v_type == VBAD) {
2035                 vclrisdirty(vp);
2036                 return(0);
2037         }
2038
2039         /*
2040          * VOP_FSYNC will start a new transaction so replicate some code
2041          * here to do it inline (see hammer2_vop_fsync()).
2042          *
2043          * WARNING: The vfsync interacts with the buffer cache and might
2044          *          block, we can't hold the inode lock at that time.
2045          *          However, we MUST ref ip before blocking to ensure that
2046          *          it isn't ripped out from under us (since we do not
2047          *          hold a lock on the vnode).
2048          */
2049         hammer2_inode_ref(ip);
2050         if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2051             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2052                 vfsync(vp, info->waitfor, 1, NULL, NULL);
2053                 if (ip->flags & (HAMMER2_INODE_RESIZED |
2054                                  HAMMER2_INODE_MODIFIED)) {
2055                         hammer2_inode_lock(ip, 0);
2056                         hammer2_inode_chain_sync(ip);
2057                         hammer2_inode_unlock(ip);
2058                 }
2059         }
2060         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2061             RB_EMPTY(&vp->v_rbdirty_tree)) {
2062                 vclrisdirty(vp);
2063         }
2064
2065         hammer2_inode_drop(ip);
2066 #if 1
2067         error = 0;
2068         if (error)
2069                 info->error = error;
2070 #endif
2071         return(0);
2072 }
2073
2074 static
2075 int
2076 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2077 {
2078         return (0);
2079 }
2080
2081 static
2082 int
2083 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2084                struct fid *fhp, struct vnode **vpp)
2085 {
2086         return (0);
2087 }
2088
2089 static
2090 int
2091 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2092                  int *exflagsp, struct ucred **credanonp)
2093 {
2094         return (0);
2095 }
2096
2097 /*
2098  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2099  * header into the HMP
2100  *
2101  * XXX read four volhdrs and use the one with the highest TID whos CRC
2102  *     matches.
2103  *
2104  * XXX check iCRCs.
2105  *
2106  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2107  *     nonexistant locations.
2108  *
2109  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2110  */
2111 static
2112 int
2113 hammer2_install_volume_header(hammer2_dev_t *hmp)
2114 {
2115         hammer2_volume_data_t *vd;
2116         struct buf *bp;
2117         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2118         int error_reported;
2119         int error;
2120         int valid;
2121         int i;
2122
2123         error_reported = 0;
2124         error = 0;
2125         valid = 0;
2126         bp = NULL;
2127
2128         /*
2129          * There are up to 4 copies of the volume header (syncs iterate
2130          * between them so there is no single master).  We don't trust the
2131          * volu_size field so we don't know precisely how large the filesystem
2132          * is, so depend on the OS to return an error if we go beyond the
2133          * block device's EOF.
2134          */
2135         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2136                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2137                               HAMMER2_VOLUME_BYTES, &bp);
2138                 if (error) {
2139                         brelse(bp);
2140                         bp = NULL;
2141                         continue;
2142                 }
2143
2144                 vd = (struct hammer2_volume_data *) bp->b_data;
2145                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2146                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2147                         brelse(bp);
2148                         bp = NULL;
2149                         continue;
2150                 }
2151
2152                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2153                         /* XXX: Reversed-endianness filesystem */
2154                         kprintf("hammer2: reverse-endian filesystem detected");
2155                         brelse(bp);
2156                         bp = NULL;
2157                         continue;
2158                 }
2159
2160                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2161                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2162                                       HAMMER2_VOLUME_ICRC0_SIZE);
2163                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2164                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2165                                        HAMMER2_VOLUME_ICRC1_SIZE);
2166                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2167                         kprintf("hammer2 volume header crc "
2168                                 "mismatch copy #%d %08x/%08x\n",
2169                                 i, crc0, crc);
2170                         error_reported = 1;
2171                         brelse(bp);
2172                         bp = NULL;
2173                         continue;
2174                 }
2175                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2176                         valid = 1;
2177                         hmp->voldata = *vd;
2178                         hmp->volhdrno = i;
2179                 }
2180                 brelse(bp);
2181                 bp = NULL;
2182         }
2183         if (valid) {
2184                 hmp->volsync = hmp->voldata;
2185                 error = 0;
2186                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2187                         kprintf("hammer2: using volume header #%d\n",
2188                                 hmp->volhdrno);
2189                 }
2190         } else {
2191                 error = EINVAL;
2192                 kprintf("hammer2: no valid volume headers found!\n");
2193         }
2194         return (error);
2195 }
2196
2197 /*
2198  * This handles hysteresis on regular file flushes.  Because the BIOs are
2199  * routed to a thread it is possible for an excessive number to build up
2200  * and cause long front-end stalls long before the runningbuffspace limit
2201  * is hit, so we implement hammer2_flush_pipe to control the
2202  * hysteresis.
2203  *
2204  * This is a particular problem when compression is used.
2205  */
2206 void
2207 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2208 {
2209         atomic_add_int(&pmp->count_lwinprog, 1);
2210 }
2211
2212 void
2213 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2214 {
2215         int lwinprog;
2216
2217         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2218         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2219             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2220                 atomic_clear_int(&pmp->count_lwinprog,
2221                                  HAMMER2_LWINPROG_WAITING);
2222                 wakeup(&pmp->count_lwinprog);
2223         }
2224         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2225             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2226                 atomic_clear_int(&pmp->count_lwinprog,
2227                                  HAMMER2_LWINPROG_WAITING0);
2228                 wakeup(&pmp->count_lwinprog);
2229         }
2230 }
2231
2232 void
2233 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2234 {
2235         int lwinprog;
2236         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2237                                     HAMMER2_LWINPROG_WAITING0;
2238
2239         for (;;) {
2240                 lwinprog = pmp->count_lwinprog;
2241                 cpu_ccfence();
2242                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2243                         break;
2244                 tsleep_interlock(&pmp->count_lwinprog, 0);
2245                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2246                 lwinprog = pmp->count_lwinprog;
2247                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2248                         break;
2249                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2250         }
2251 }
2252
2253 /*
2254  * Manage excessive memory resource use for chain and related
2255  * structures.
2256  */
2257 void
2258 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2259 {
2260         uint32_t waiting;
2261         uint32_t count;
2262         uint32_t limit;
2263 #if 0
2264         static int zzticks;
2265 #endif
2266
2267         /*
2268          * Atomic check condition and wait.  Also do an early speedup of
2269          * the syncer to try to avoid hitting the wait.
2270          */
2271         for (;;) {
2272                 waiting = pmp->inmem_dirty_chains;
2273                 cpu_ccfence();
2274                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2275
2276                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2277                 if (limit < hammer2_limit_dirty_chains)
2278                         limit = hammer2_limit_dirty_chains;
2279                 if (limit < 1000)
2280                         limit = 1000;
2281
2282 #if 0
2283                 if ((int)(ticks - zzticks) > hz) {
2284                         zzticks = ticks;
2285                         kprintf("count %ld %ld\n", count, limit);
2286                 }
2287 #endif
2288
2289                 /*
2290                  * Block if there are too many dirty chains present, wait
2291                  * for the flush to clean some out.
2292                  */
2293                 if (count > limit) {
2294                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2295                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2296                                                waiting,
2297                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2298                                 speedup_syncer(pmp->mp);
2299                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2300                                        "chnmem", hz);
2301                         }
2302                         continue;       /* loop on success or fail */
2303                 }
2304
2305                 /*
2306                  * Try to start an early flush before we are forced to block.
2307                  */
2308                 if (count > limit * 7 / 10)
2309                         speedup_syncer(pmp->mp);
2310                 break;
2311         }
2312 }
2313
2314 void
2315 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2316 {
2317         if (pmp) {
2318                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2319         }
2320 }
2321
2322 void
2323 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2324 {
2325         uint32_t waiting;
2326
2327         if (pmp == NULL)
2328                 return;
2329
2330         for (;;) {
2331                 waiting = pmp->inmem_dirty_chains;
2332                 cpu_ccfence();
2333                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2334                                        waiting,
2335                                        (waiting - 1) &
2336                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2337                         break;
2338                 }
2339         }
2340
2341         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2342                 wakeup(&pmp->inmem_dirty_chains);
2343 }
2344
2345 /*
2346  * Debugging
2347  */
2348 void
2349 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2350 {
2351         hammer2_chain_t *scan;
2352         hammer2_chain_t *parent;
2353
2354         --*countp;
2355         if (*countp == 0) {
2356                 kprintf("%*.*s...\n", tab, tab, "");
2357                 return;
2358         }
2359         if (*countp < 0)
2360                 return;
2361         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2362                 tab, tab, "", pfx,
2363                 chain, chain->bref.type,
2364                 chain->bref.key, chain->bref.keybits,
2365                 chain->bref.mirror_tid);
2366
2367         kprintf("%*.*s      [%08x] (%s) refs=%d",
2368                 tab, tab, "",
2369                 chain->flags,
2370                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2371                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2372                 chain->refs);
2373
2374         parent = chain->parent;
2375         if (parent)
2376                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2377                         tab, tab, "",
2378                         parent, parent->flags, parent->refs);
2379         if (RB_EMPTY(&chain->core.rbtree)) {
2380                 kprintf("\n");
2381         } else {
2382                 kprintf(" {\n");
2383                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2384                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2385                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2386                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2387                                 chain->data->ipdata.filename);
2388                 else
2389                         kprintf("%*.*s}\n", tab, tab, "");
2390         }
2391 }