sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2018 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         int pass;
  73 };
  74
  75 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  76 static struct hammer2_mntlist hammer2_mntlist;
  77
  78 struct hammer2_pfslist hammer2_pfslist;
  79 struct hammer2_pfslist hammer2_spmplist;
  80 struct lock hammer2_mntlk;
  81
  82 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT;
  83 int hammer2_debug;
  84 int hammer2_cluster_meta_read = 1;      /* physical read-ahead */
  85 int hammer2_cluster_data_read = 4;      /* physical read-ahead */
  86 int hammer2_dedup_enable = 1;
  87 int hammer2_always_compress = 0;        /* always try to compress */
  88 int hammer2_inval_enable = 0;
  89 int hammer2_flush_pipe = 100;
  90 int hammer2_dio_count;
  91 int hammer2_dio_limit = 256;
  92 int hammer2_bulkfree_tps = 5000;
  93 long hammer2_chain_allocs;
  94 long hammer2_chain_frees;
  95 long hammer2_limit_dirty_chains;
  96 long hammer2_count_modified_chains;
  97 long hammer2_iod_invals;
  98 long hammer2_iod_file_read;
  99 long hammer2_iod_meta_read;
 100 long hammer2_iod_indr_read;
 101 long hammer2_iod_fmap_read;
 102 long hammer2_iod_volu_read;
 103 long hammer2_iod_file_write;
 104 long hammer2_iod_file_wembed;
 105 long hammer2_iod_file_wzero;
 106 long hammer2_iod_file_wdedup;
 107 long hammer2_iod_meta_write;
 108 long hammer2_iod_indr_write;
 109 long hammer2_iod_fmap_write;
 110 long hammer2_iod_volu_write;
 111
 112 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 113 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 114                 "Buffer used for compression.");
 115
 116 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 117 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 118                 "Buffer used for decompression.");
 119
 120 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 121
 122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
 123            &hammer2_supported_version, 0, "");
 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 125            &hammer2_debug, 0, "");
 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
 127            &hammer2_cluster_meta_read, 0, "");
 128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
 129            &hammer2_cluster_data_read, 0, "");
 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
 131            &hammer2_dedup_enable, 0, "");
 132 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
 133            &hammer2_always_compress, 0, "");
 134 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
 135            &hammer2_inval_enable, 0, "");
 136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 137            &hammer2_flush_pipe, 0, "");
 138 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
 139            &hammer2_bulkfree_tps, 0, "");
 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
 141            &hammer2_chain_allocs, 0, "");
 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
 143            &hammer2_chain_frees, 0, "");
 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 145            &hammer2_limit_dirty_chains, 0, "");
 146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 147            &hammer2_count_modified_chains, 0, "");
 148 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 149            &hammer2_dio_count, 0, "");
 150 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
 151            &hammer2_dio_limit, 0, "");
 152
 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
 154            &hammer2_iod_invals, 0, "");
 155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 156            &hammer2_iod_file_read, 0, "");
 157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 158            &hammer2_iod_meta_read, 0, "");
 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 160            &hammer2_iod_indr_read, 0, "");
 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 162            &hammer2_iod_fmap_read, 0, "");
 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 164            &hammer2_iod_volu_read, 0, "");
 165
 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 167            &hammer2_iod_file_write, 0, "");
 168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 169            &hammer2_iod_file_wembed, 0, "");
 170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 171            &hammer2_iod_file_wzero, 0, "");
 172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 173            &hammer2_iod_file_wdedup, 0, "");
 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 175            &hammer2_iod_meta_write, 0, "");
 176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 177            &hammer2_iod_indr_write, 0, "");
 178 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 179            &hammer2_iod_fmap_write, 0, "");
 180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 181            &hammer2_iod_volu_write, 0, "");
 182
 183 long hammer2_process_icrc32;
 184 long hammer2_process_xxhash64;
 185 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW,
 186            &hammer2_process_icrc32, 0, "");
 187 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW,
 188            &hammer2_process_xxhash64, 0, "");
 189
 190 static int hammer2_vfs_init(struct vfsconf *conf);
 191 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 192 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 193                                 struct ucred *cred);
 194 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 195                                 struct vnode *, struct ucred *);
 196 static int hammer2_recovery(hammer2_dev_t *hmp);
 197 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 198 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 199 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 200                                 struct ucred *cred);
 201 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 202                                 struct ucred *cred);
 203 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 204                                 struct fid *fhp, struct vnode **vpp);
 205 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 206 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 207                                 int *exflagsp, struct ucred **credanonp);
 208
 209 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 210 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 211
 212 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 213
 214 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 215 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 216                                 hammer2_dev_t *hmp);
 217 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
 218
 219 /*
 220  * HAMMER2 vfs operations.
 221  */
 222 static struct vfsops hammer2_vfsops = {
 223         .vfs_init       = hammer2_vfs_init,
 224         .vfs_uninit     = hammer2_vfs_uninit,
 225         .vfs_sync       = hammer2_vfs_sync,
 226         .vfs_mount      = hammer2_vfs_mount,
 227         .vfs_unmount    = hammer2_vfs_unmount,
 228         .vfs_root       = hammer2_vfs_root,
 229         .vfs_statfs     = hammer2_vfs_statfs,
 230         .vfs_statvfs    = hammer2_vfs_statvfs,
 231         .vfs_vget       = hammer2_vfs_vget,
 232         .vfs_vptofh     = hammer2_vfs_vptofh,
 233         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 234         .vfs_checkexp   = hammer2_vfs_checkexp
 235 };
 236
 237 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 238
 239 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
 240 MODULE_VERSION(hammer2, 1);
 241
 242 static
 243 int
 244 hammer2_vfs_init(struct vfsconf *conf)
 245 {
 246         static struct objcache_malloc_args margs_read;
 247         static struct objcache_malloc_args margs_write;
 248         static struct objcache_malloc_args margs_vop;
 249
 250         int error;
 251
 252         error = 0;
 253
 254         /*
 255          * A large DIO cache is needed to retain dedup enablement masks.
 256          * The bulkfree code clears related masks as part of the disk block
 257          * recycling algorithm, preventing it from being used for a later
 258          * dedup.
 259          *
 260          * NOTE: A large buffer cache can actually interfere with dedup
 261          *       operation because we dedup based on media physical buffers
 262          *       and not logical buffers.  Try to make the DIO case large
 263          *       enough to avoid this problem, but also cap it.
 264          */
 265         hammer2_dio_limit = nbuf * 2;
 266         if (hammer2_dio_limit > 100000)
 267                 hammer2_dio_limit = 100000;
 268
 269         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 270                 error = EINVAL;
 271         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 272                 error = EINVAL;
 273         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 274                 error = EINVAL;
 275
 276         if (error)
 277                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 278
 279         margs_read.objsize = 65536;
 280         margs_read.mtype = M_HAMMER2_DEBUFFER;
 281
 282         margs_write.objsize = 32768;
 283         margs_write.mtype = M_HAMMER2_CBUFFER;
 284
 285         margs_vop.objsize = sizeof(hammer2_xop_t);
 286         margs_vop.mtype = M_HAMMER2;
 287
 288         /*
 289          * Note thaht for the XOPS cache we want backing store allocations
 290          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 291          * confusion), so use the backing store function that does it.  This
 292          * means that initial XOPS objects are zerod but REUSED objects are
 293          * not.  So we are responsible for cleaning the object up sufficiently
 294          * for our needs before objcache_put()ing it back (typically just the
 295          * FIFO indices).
 296          */
 297         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 298                                 0, 1, NULL, NULL, NULL,
 299                                 objcache_malloc_alloc,
 300                                 objcache_malloc_free,
 301                                 &margs_read);
 302         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 303                                 0, 1, NULL, NULL, NULL,
 304                                 objcache_malloc_alloc,
 305                                 objcache_malloc_free,
 306                                 &margs_write);
 307         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 308                                 0, 1, NULL, NULL, NULL,
 309                                 objcache_malloc_alloc_zero,
 310                                 objcache_malloc_free,
 311                                 &margs_vop);
 312
 313
 314         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 315         TAILQ_INIT(&hammer2_mntlist);
 316         TAILQ_INIT(&hammer2_pfslist);
 317         TAILQ_INIT(&hammer2_spmplist);
 318
 319         hammer2_limit_dirty_chains = maxvnodes / 10;
 320         if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
 321                 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
 322
 323         return (error);
 324 }
 325
 326 static
 327 int
 328 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 329 {
 330         objcache_destroy(cache_buffer_read);
 331         objcache_destroy(cache_buffer_write);
 332         objcache_destroy(cache_xops);
 333         return 0;
 334 }
 335
 336 /*
 337  * Core PFS allocator.  Used to allocate or reference the pmp structure
 338  * for PFS cluster mounts and the spmp structure for media (hmp) structures.
 339  * The pmp can be passed in or loaded by this function using the chain and
 340  * inode data.
 341  *
 342  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 343  * transactions.  Note that synchronization does not use this field.
 344  * (typically frontend operations and synchronization cannot run on the
 345  * same PFS node at the same time).
 346  *
 347  * XXX check locking
 348  */
 349 hammer2_pfs_t *
 350 hammer2_pfsalloc(hammer2_chain_t *chain,
 351                  const hammer2_inode_data_t *ripdata,
 352                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 353 {
 354         hammer2_pfs_t *pmp;
 355         hammer2_inode_t *iroot;
 356         int count;
 357         int i;
 358         int j;
 359
 360         pmp = NULL;
 361
 362         /*
 363          * Locate or create the PFS based on the cluster id.  If ripdata
 364          * is NULL this is a spmp which is unique and is always allocated.
 365          *
 366          * If the device is mounted in local mode all PFSs are considered
 367          * independent and not part of any cluster (for debugging only).
 368          */
 369         if (ripdata) {
 370                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 371                         if (force_local != pmp->force_local)
 372                                 continue;
 373                         if (force_local == NULL &&
 374                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 375                                  sizeof(pmp->pfs_clid)) == 0) {
 376                                         break;
 377                         } else if (force_local && pmp->pfs_names[0] &&
 378                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 379                                         break;
 380                         }
 381                 }
 382         }
 383
 384         if (pmp == NULL) {
 385                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 386                 pmp->force_local = force_local;
 387                 hammer2_trans_manage_init(pmp);
 388                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 389                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 390                 lockinit(&pmp->lock, "pfslk", 0, 0);
 391                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 392                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 393                 spin_init(&pmp->xop_spin, "h2xop");
 394                 spin_init(&pmp->lru_spin, "h2lru");
 395                 RB_INIT(&pmp->inum_tree);
 396                 TAILQ_INIT(&pmp->sideq);
 397                 TAILQ_INIT(&pmp->lru_list);
 398                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 399
 400                 /*
 401                  * Distribute backend operations to threads
 402                  */
 403                 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
 404                         hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
 405
 406                 /*
 407                  * Save the last media transaction id for the flusher.  Set
 408                  * initial
 409                  */
 410                 if (ripdata) {
 411                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 412                         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 413                 } else {
 414                         pmp->flags |= HAMMER2_PMPF_SPMP;
 415                         TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
 416                 }
 417
 418                 /*
 419                  * The synchronization thread may start too early, make
 420                  * sure it stays frozen until we are ready to let it go.
 421                  * XXX
 422                  */
 423                 /*
 424                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 425                                          HAMMER2_THREAD_REMASTER;
 426                 */
 427         }
 428
 429         /*
 430          * Create the PFS's root inode and any missing XOP helper threads.
 431          */
 432         if ((iroot = pmp->iroot) == NULL) {
 433                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 434                 if (ripdata)
 435                         iroot->meta = ripdata->meta;
 436                 pmp->iroot = iroot;
 437                 hammer2_inode_ref(iroot);
 438                 hammer2_inode_unlock(iroot);
 439         }
 440
 441         /*
 442          * Stop here if no chain is passed in.
 443          */
 444         if (chain == NULL)
 445                 goto done;
 446
 447         /*
 448          * When a chain is passed in we must add it to the PFS's root
 449          * inode, update pmp->pfs_types[], and update the syncronization
 450          * threads.
 451          *
 452          * When forcing local mode, mark the PFS as a MASTER regardless.
 453          *
 454          * At the moment empty spots can develop due to removals or failures.
 455          * Ultimately we want to re-fill these spots but doing so might
 456          * confused running code. XXX
 457          */
 458         hammer2_inode_ref(iroot);
 459         hammer2_mtx_ex(&iroot->lock);
 460         j = iroot->cluster.nchains;
 461
 462         if (j == HAMMER2_MAXCLUSTER) {
 463                 kprintf("hammer2_mount: cluster full!\n");
 464                 /* XXX fatal error? */
 465         } else {
 466                 KKASSERT(chain->pmp == NULL);
 467                 chain->pmp = pmp;
 468                 hammer2_chain_ref(chain);
 469                 iroot->cluster.array[j].chain = chain;
 470                 if (force_local)
 471                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 472                 else
 473                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 474                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 475                 pmp->pfs_hmps[j] = chain->hmp;
 476
 477                 /*
 478                  * If the PFS is already mounted we must account
 479                  * for the mount_count here.
 480                  */
 481                 if (pmp->mp)
 482                         ++chain->hmp->mount_count;
 483
 484                 /*
 485                  * May have to fixup dirty chain tracking.  Previous
 486                  * pmp was NULL so nothing to undo.
 487                  */
 488                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 489                         hammer2_pfs_memory_inc(pmp);
 490                 ++j;
 491         }
 492         iroot->cluster.nchains = j;
 493
 494         /*
 495          * Update nmasters from any PFS inode which is part of the cluster.
 496          * It is possible that this will result in a value which is too
 497          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 498          * override this value later on.
 499          *
 500          * (This informs us of masters that might not currently be
 501          *  discoverable by this mount).
 502          */
 503         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 504                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 505         }
 506
 507         /*
 508          * Count visible masters.  Masters are usually added with
 509          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 510          * are more (XXX and must update the master inodes).
 511          */
 512         count = 0;
 513         for (i = 0; i < iroot->cluster.nchains; ++i) {
 514                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 515                         ++count;
 516         }
 517         if (pmp->pfs_nmasters < count)
 518                 pmp->pfs_nmasters = count;
 519
 520         /*
 521          * Create missing synchronization and support threads.
 522          *
 523          * Single-node masters (including snapshots) have nothing to
 524          * synchronize and do not require this thread.
 525          *
 526          * Multi-node masters or any number of soft masters, slaves, copy,
 527          * or other PFS types need the thread.
 528          *
 529          * Each thread is responsible for its particular cluster index.
 530          * We use independent threads so stalls or mismatches related to
 531          * any given target do not affect other targets.
 532          */
 533         for (i = 0; i < iroot->cluster.nchains; ++i) {
 534                 /*
 535                  * Single-node masters (including snapshots) have nothing
 536                  * to synchronize and will make direct xops support calls,
 537                  * thus they do not require this thread.
 538                  *
 539                  * Note that there can be thousands of snapshots.  We do not
 540                  * want to create thousands of threads.
 541                  */
 542                 if (pmp->pfs_nmasters <= 1 &&
 543                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 544                         continue;
 545                 }
 546
 547                 /*
 548                  * Sync support thread
 549                  */
 550                 if (pmp->sync_thrs[i].td == NULL) {
 551                         hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
 552                                            "h2nod", i, -1,
 553                                            hammer2_primary_sync_thread);
 554                 }
 555         }
 556
 557         /*
 558          * Create missing Xop threads
 559          *
 560          * NOTE: We create helper threads for all mounted PFSs or any
 561          *       PFSs with 2+ nodes (so the sync thread can update them,
 562          *       even if not mounted).
 563          */
 564         if (pmp->mp || iroot->cluster.nchains >= 2)
 565                 hammer2_xop_helper_create(pmp);
 566
 567         hammer2_mtx_unlock(&iroot->lock);
 568         hammer2_inode_drop(iroot);
 569 done:
 570         return pmp;
 571 }
 572
 573 /*
 574  * Deallocate an element of a probed PFS.  If destroying and this is a
 575  * MASTER, adjust nmasters.
 576  *
 577  * This function does not physically destroy the PFS element in its device
 578  * under the super-root  (see hammer2_ioctl_pfs_delete()).
 579  */
 580 void
 581 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
 582 {
 583         hammer2_inode_t *iroot;
 584         hammer2_chain_t *chain;
 585         int j;
 586
 587         /*
 588          * Cleanup our reference on iroot.  iroot is (should) not be needed
 589          * by the flush code.
 590          */
 591         iroot = pmp->iroot;
 592         if (iroot) {
 593                 /*
 594                  * Stop synchronizing
 595                  *
 596                  * XXX flush after acquiring the iroot lock.
 597                  * XXX clean out the cluster index from all inode structures.
 598                  */
 599                 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
 600
 601                 /*
 602                  * Remove the cluster index from the group.  If destroying
 603                  * the PFS and this is a master, adjust pfs_nmasters.
 604                  */
 605                 hammer2_mtx_ex(&iroot->lock);
 606                 chain = iroot->cluster.array[clindex].chain;
 607                 iroot->cluster.array[clindex].chain = NULL;
 608
 609                 switch(pmp->pfs_types[clindex]) {
 610                 case HAMMER2_PFSTYPE_MASTER:
 611                         if (destroying && pmp->pfs_nmasters > 0)
 612                                 --pmp->pfs_nmasters;
 613                         /* XXX adjust ripdata->meta.pfs_nmasters */
 614                         break;
 615                 default:
 616                         break;
 617                 }
 618                 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
 619
 620                 hammer2_mtx_unlock(&iroot->lock);
 621
 622                 /*
 623                  * Release the chain.
 624                  */
 625                 if (chain) {
 626                         atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 627                         hammer2_chain_drop(chain);
 628                 }
 629
 630                 /*
 631                  * Terminate all XOP threads for the cluster index.
 632                  */
 633                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 634                         hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
 635         }
 636 }
 637
 638 /*
 639  * Destroy a PFS, typically only occurs after the last mount on a device
 640  * has gone away.
 641  */
 642 static void
 643 hammer2_pfsfree(hammer2_pfs_t *pmp)
 644 {
 645         hammer2_inode_t *iroot;
 646         hammer2_chain_t *chain;
 647         int i;
 648         int j;
 649
 650         /*
 651          * Cleanup our reference on iroot.  iroot is (should) not be needed
 652          * by the flush code.
 653          */
 654         if (pmp->flags & HAMMER2_PMPF_SPMP)
 655                 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
 656         else
 657                 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 658
 659         iroot = pmp->iroot;
 660         if (iroot) {
 661                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 662                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 663                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 664                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 665                 }
 666 #if REPORT_REFS_ERRORS
 667                 if (pmp->iroot->refs != 1)
 668                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 669                                 pmp->iroot, pmp->iroot->refs);
 670 #else
 671                 KKASSERT(pmp->iroot->refs == 1);
 672 #endif
 673                 /* ref for pmp->iroot */
 674                 hammer2_inode_drop(pmp->iroot);
 675                 pmp->iroot = NULL;
 676         }
 677
 678         /*
 679          * Cleanup chains remaining on LRU list.
 680          */
 681         hammer2_spin_ex(&pmp->lru_spin);
 682         while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
 683                 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
 684                 atomic_add_int(&pmp->lru_count, -1);
 685                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
 686                 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
 687                 hammer2_chain_ref(chain);
 688                 hammer2_spin_unex(&pmp->lru_spin);
 689                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 690                 hammer2_chain_drop(chain);
 691                 hammer2_spin_ex(&pmp->lru_spin);
 692         }
 693         hammer2_spin_unex(&pmp->lru_spin);
 694
 695         /*
 696          * Free remaining pmp resources
 697          */
 698         kmalloc_destroy(&pmp->mmsg);
 699         kmalloc_destroy(&pmp->minode);
 700
 701         kfree(pmp, M_HAMMER2);
 702 }
 703
 704 /*
 705  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 706  * empty is terminated and freed.
 707  *
 708  * XXX inefficient.
 709  */
 710 static void
 711 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
 712 {
 713         hammer2_pfs_t *pmp;
 714         hammer2_inode_t *iroot;
 715         hammer2_chain_t *rchain;
 716         int didfreeze;
 717         int i;
 718         int j;
 719         struct hammer2_pfslist *wlist;
 720
 721         if (which == 0)
 722                 wlist = &hammer2_pfslist;
 723         else
 724                 wlist = &hammer2_spmplist;
 725 again:
 726         TAILQ_FOREACH(pmp, wlist, mntentry) {
 727                 if ((iroot = pmp->iroot) == NULL)
 728                         continue;
 729                 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
 730                 hammer2_inode_run_sideq(pmp, 1);
 731                 hammer2_bioq_sync(pmp);
 732                 hammer2_trans_done(pmp);
 733
 734                 /*
 735                  * Determine if this PFS is affected.  If it is we must
 736                  * freeze all management threads and lock its iroot.
 737                  *
 738                  * Freezing a management thread forces it idle, operations
 739                  * in-progress will be aborted and it will have to start
 740                  * over again when unfrozen, or exit if told to exit.
 741                  */
 742                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 743                         if (pmp->pfs_hmps[i] == hmp)
 744                                 break;
 745                 }
 746                 if (i != HAMMER2_MAXCLUSTER) {
 747                         /*
 748                          * Make sure all synchronization threads are locked
 749                          * down.
 750                          */
 751                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 752                                 if (pmp->pfs_hmps[i] == NULL)
 753                                         continue;
 754                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 755                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 756                                         hammer2_thr_freeze_async(
 757                                                 &pmp->xop_groups[j].thrs[i]);
 758                                 }
 759                         }
 760                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 761                                 if (pmp->pfs_hmps[i] == NULL)
 762                                         continue;
 763                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 764                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 765                                         hammer2_thr_freeze(
 766                                                 &pmp->xop_groups[j].thrs[i]);
 767                                 }
 768                         }
 769
 770                         /*
 771                          * Lock the inode and clean out matching chains.
 772                          * Note that we cannot use hammer2_inode_lock_*()
 773                          * here because that would attempt to validate the
 774                          * cluster that we are in the middle of ripping
 775                          * apart.
 776                          *
 777                          * WARNING! We are working directly on the inodes
 778                          *          embedded cluster.
 779                          */
 780                         hammer2_mtx_ex(&iroot->lock);
 781
 782                         /*
 783                          * Remove the chain from matching elements of the PFS.
 784                          */
 785                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 786                                 if (pmp->pfs_hmps[i] != hmp)
 787                                         continue;
 788                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 789                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 790                                         hammer2_thr_delete(
 791                                                 &pmp->xop_groups[j].thrs[i]);
 792                                 }
 793                                 rchain = iroot->cluster.array[i].chain;
 794                                 iroot->cluster.array[i].chain = NULL;
 795                                 pmp->pfs_types[i] = 0;
 796                                 if (pmp->pfs_names[i]) {
 797                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 798                                         pmp->pfs_names[i] = NULL;
 799                                 }
 800                                 if (rchain) {
 801                                         hammer2_chain_drop(rchain);
 802                                         /* focus hint */
 803                                         if (iroot->cluster.focus == rchain)
 804                                                 iroot->cluster.focus = NULL;
 805                                 }
 806                                 pmp->pfs_hmps[i] = NULL;
 807                         }
 808                         hammer2_mtx_unlock(&iroot->lock);
 809                         didfreeze = 1;  /* remaster, unfreeze down below */
 810                 } else {
 811                         didfreeze = 0;
 812                 }
 813
 814                 /*
 815                  * Cleanup trailing chains.  Gaps may remain.
 816                  */
 817                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 818                         if (pmp->pfs_hmps[i])
 819                                 break;
 820                 }
 821                 iroot->cluster.nchains = i + 1;
 822
 823                 /*
 824                  * If the PMP has no elements remaining we can destroy it.
 825                  * (this will transition management threads from frozen->exit).
 826                  */
 827                 if (iroot->cluster.nchains == 0) {
 828                         /*
 829                          * If this was the hmp's spmp, we need to clean
 830                          * a little more stuff out.
 831                          */
 832                         if (hmp->spmp == pmp) {
 833                                 hmp->spmp = NULL;
 834                                 hmp->vchain.pmp = NULL;
 835                                 hmp->fchain.pmp = NULL;
 836                         }
 837
 838                         /*
 839                          * Free the pmp and restart the loop
 840                          */
 841                         hammer2_pfsfree(pmp);
 842                         goto again;
 843                 }
 844
 845                 /*
 846                  * If elements still remain we need to set the REMASTER
 847                  * flag and unfreeze it.
 848                  */
 849                 if (didfreeze) {
 850                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 851                                 if (pmp->pfs_hmps[i] == NULL)
 852                                         continue;
 853                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 854                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 855                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 856                                         hammer2_thr_remaster(
 857                                                 &pmp->xop_groups[j].thrs[i]);
 858                                         hammer2_thr_unfreeze(
 859                                                 &pmp->xop_groups[j].thrs[i]);
 860                                 }
 861                         }
 862                 }
 863         }
 864 }
 865
 866 /*
 867  * Mount or remount HAMMER2 fileystem from physical media
 868  *
 869  *      mountroot
 870  *              mp              mount point structure
 871  *              path            NULL
 872  *              data            <unused>
 873  *              cred            <unused>
 874  *
 875  *      mount
 876  *              mp              mount point structure
 877  *              path            path to mount point
 878  *              data            pointer to argument structure in user space
 879  *                      volume  volume path (device@LABEL form)
 880  *                      hflags  user mount flags
 881  *              cred            user credentials
 882  *
 883  * RETURNS:     0       Success
 884  *              !0      error number
 885  */
 886 static
 887 int
 888 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 889                   struct ucred *cred)
 890 {
 891         struct hammer2_mount_info info;
 892         hammer2_pfs_t *pmp;
 893         hammer2_pfs_t *spmp;
 894         hammer2_dev_t *hmp;
 895         hammer2_dev_t *force_local;
 896         hammer2_key_t key_next;
 897         hammer2_key_t key_dummy;
 898         hammer2_key_t lhc;
 899         struct vnode *devvp;
 900         struct nlookupdata nd;
 901         hammer2_chain_t *parent;
 902         hammer2_chain_t *chain;
 903         hammer2_cluster_t *cluster;
 904         const hammer2_inode_data_t *ripdata;
 905         hammer2_blockref_t bref;
 906         struct file *fp;
 907         char devstr[MNAMELEN];
 908         size_t size;
 909         size_t done;
 910         char *dev;
 911         char *label;
 912         int ronly = 1;
 913         int error;
 914         int i;
 915
 916         hmp = NULL;
 917         pmp = NULL;
 918         dev = NULL;
 919         label = NULL;
 920         devvp = NULL;
 921
 922         kprintf("hammer2_mount\n");
 923
 924         if (path == NULL) {
 925                 /*
 926                  * Root mount
 927                  */
 928                 bzero(&info, sizeof(info));
 929                 info.cluster_fd = -1;
 930                 ksnprintf(devstr, sizeof(devstr), "%s",
 931                           mp->mnt_stat.f_mntfromname);
 932                 kprintf("hammer2_mount: root '%s'\n", devstr);
 933         } else {
 934                 /*
 935                  * Non-root mount or updating a mount
 936                  */
 937                 error = copyin(data, &info, sizeof(info));
 938                 if (error)
 939                         return (error);
 940
 941                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 942                 if (error)
 943                         return (error);
 944         }
 945
 946         /*
 947          * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
 948          * if no label specified, based on the partition id.  Error out if no
 949          * label or device (with partition id) is specified.  This is strictly
 950          * a convenience to match the default label created by newfs_hammer2,
 951          * our preference is that a label always be specified.
 952          *
 953          * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command
 954          *       that does not specify a device, as long as some H2 label
 955          *       has already been mounted from that device.  This makes
 956          *       mounting snapshots a lot easier.
 957          */
 958         dev = devstr;
 959         label = strchr(devstr, '@');
 960         if (label && ((label + 1) - dev) > done)
 961                 return (EINVAL);
 962         if (label == NULL || label[1] == 0) {
 963                 char slice;
 964
 965                 if (label == NULL)
 966                         label = devstr + strlen(devstr);
 967                 slice = label[-1];
 968                 switch(slice) {
 969                 case 'a':
 970                         label = "BOOT";
 971                         break;
 972                 case 'd':
 973                         label = "ROOT";
 974                         break;
 975                 default:
 976                         label = "DATA";
 977                         break;
 978                 }
 979         } else {
 980                 *label = '\0';
 981                 label++;
 982         }
 983
 984         kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
 985                 dev, label, (mp->mnt_flag & MNT_RDONLY));
 986
 987         if (mp->mnt_flag & MNT_UPDATE) {
 988                 /*
 989                  * Update mount.  Note that pmp->iroot->cluster is
 990                  * an inode-embedded cluster and thus cannot be
 991                  * directly locked.
 992                  *
 993                  * XXX HAMMER2 needs to implement NFS export via
 994                  *     mountctl.
 995                  */
 996                 pmp = MPTOPMP(mp);
 997                 pmp->hflags = info.hflags;
 998                 cluster = &pmp->iroot->cluster;
 999                 for (i = 0; i < cluster->nchains; ++i) {
1000                         if (cluster->array[i].chain == NULL)
1001                                 continue;
1002                         hmp = cluster->array[i].chain->hmp;
1003                         devvp = hmp->devvp;
1004                         error = hammer2_remount(hmp, mp, path,
1005                                                 devvp, cred);
1006                         if (error)
1007                                 break;
1008                 }
1009
1010                 return error;
1011         }
1012
1013         /*
1014          * HMP device mount
1015          *
1016          * If a path is specified and dev is not an empty string, lookup the
1017          * name and verify that it referes to a block device.
1018          *
1019          * If a path is specified and dev is an empty string we fall through
1020          * and locate the label in the hmp search.
1021          */
1022         if (path && *dev != 0) {
1023                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
1024                 if (error == 0)
1025                         error = nlookup(&nd);
1026                 if (error == 0)
1027                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
1028                 nlookup_done(&nd);
1029         } else if (path == NULL) {
1030                 /* root mount */
1031                 cdev_t cdev = kgetdiskbyname(dev);
1032                 error = bdevvp(cdev, &devvp);
1033                 if (error)
1034                         kprintf("hammer2: cannot find '%s'\n", dev);
1035         } else {
1036                 /*
1037                  * We will locate the hmp using the label in the hmp loop.
1038                  */
1039                 error = 0;
1040         }
1041
1042         /*
1043          * Make sure its a block device.  Do not check to see if it is
1044          * already mounted until we determine that its a fresh H2 device.
1045          */
1046         if (error == 0 && devvp) {
1047                 vn_isdisk(devvp, &error);
1048         }
1049
1050         /*
1051          * Determine if the device has already been mounted.  After this
1052          * check hmp will be non-NULL if we are doing the second or more
1053          * hammer2 mounts from the same device.
1054          */
1055         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1056         if (devvp) {
1057                 /*
1058                  * Match the device.  Due to the way devfs works,
1059                  * we may not be able to directly match the vnode pointer,
1060                  * so also check to see if the underlying device matches.
1061                  */
1062                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1063                         if (hmp->devvp == devvp)
1064                                 break;
1065                         if (devvp->v_rdev &&
1066                             hmp->devvp->v_rdev == devvp->v_rdev) {
1067                                 break;
1068                         }
1069                 }
1070
1071                 /*
1072                  * If no match this may be a fresh H2 mount, make sure
1073                  * the device is not mounted on anything else.
1074                  */
1075                 if (hmp == NULL)
1076                         error = vfs_mountedon(devvp);
1077         } else if (error == 0) {
1078                 /*
1079                  * Match the label to a pmp already probed.
1080                  */
1081                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1082                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1083                                 if (pmp->pfs_names[i] &&
1084                                     strcmp(pmp->pfs_names[i], label) == 0) {
1085                                         hmp = pmp->pfs_hmps[i];
1086                                         break;
1087                                 }
1088                         }
1089                         if (hmp)
1090                                 break;
1091                 }
1092                 if (hmp == NULL)
1093                         error = ENOENT;
1094         }
1095
1096         /*
1097          * Open the device if this isn't a secondary mount and construct
1098          * the H2 device mount (hmp).
1099          */
1100         if (hmp == NULL) {
1101                 hammer2_chain_t *schain;
1102                 hammer2_xid_t xid;
1103
1104                 if (error == 0 && vcount(devvp) > 0) {
1105                         kprintf("Primary device already has references\n");
1106                         error = EBUSY;
1107                 }
1108
1109                 /*
1110                  * Now open the device
1111                  */
1112                 if (error == 0) {
1113                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1114                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1115                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
1116                         if (error == 0) {
1117                                 error = VOP_OPEN(devvp,
1118                                              (ronly ? FREAD : FREAD | FWRITE),
1119                                              FSCRED, NULL);
1120                         }
1121                         vn_unlock(devvp);
1122                 }
1123                 if (error && devvp) {
1124                         vrele(devvp);
1125                         devvp = NULL;
1126                 }
1127                 if (error) {
1128                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1129                         return error;
1130                 }
1131                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1132                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1133                 hmp->ronly = ronly;
1134                 hmp->devvp = devvp;
1135                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1136                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1137                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1138                 RB_INIT(&hmp->iotree);
1139                 spin_init(&hmp->io_spin, "hm2mount_io");
1140                 spin_init(&hmp->list_spin, "hm2mount_list");
1141                 TAILQ_INIT(&hmp->flushq);
1142
1143                 lockinit(&hmp->vollk, "h2vol", 0, 0);
1144                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1145                 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1146
1147                 /*
1148                  * vchain setup. vchain.data is embedded.
1149                  * vchain.refs is initialized and will never drop to 0.
1150                  *
1151                  * NOTE! voldata is not yet loaded.
1152                  */
1153                 hmp->vchain.hmp = hmp;
1154                 hmp->vchain.refs = 1;
1155                 hmp->vchain.data = (void *)&hmp->voldata;
1156                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1157                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1158                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1159
1160                 hammer2_chain_core_init(&hmp->vchain);
1161                 /* hmp->vchain.u.xxx is left NULL */
1162
1163                 /*
1164                  * fchain setup.  fchain.data is embedded.
1165                  * fchain.refs is initialized and will never drop to 0.
1166                  *
1167                  * The data is not used but needs to be initialized to
1168                  * pass assertion muster.  We use this chain primarily
1169                  * as a placeholder for the freemap's top-level RBTREE
1170                  * so it does not interfere with the volume's topology
1171                  * RBTREE.
1172                  */
1173                 hmp->fchain.hmp = hmp;
1174                 hmp->fchain.refs = 1;
1175                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1176                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1177                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1178                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1179                 hmp->fchain.bref.methods =
1180                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1181                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1182
1183                 hammer2_chain_core_init(&hmp->fchain);
1184                 /* hmp->fchain.u.xxx is left NULL */
1185
1186                 /*
1187                  * Install the volume header and initialize fields from
1188                  * voldata.
1189                  */
1190                 error = hammer2_install_volume_header(hmp);
1191                 if (error) {
1192                         hammer2_unmount_helper(mp, NULL, hmp);
1193                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1194                         hammer2_vfs_unmount(mp, MNT_FORCE);
1195                         return error;
1196                 }
1197
1198                 /*
1199                  * Really important to get these right or flush will get
1200                  * confused.
1201                  */
1202                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1203                 spmp = hmp->spmp;
1204
1205                 /*
1206                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
1207                  * is inherited from the volume header.
1208                  */
1209                 xid = 0;
1210                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1211                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1212                 hmp->vchain.pmp = spmp;
1213                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1214                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1215                 hmp->fchain.pmp = spmp;
1216
1217                 /*
1218                  * First locate the super-root inode, which is key 0
1219                  * relative to the volume header's blockset.
1220                  *
1221                  * Then locate the root inode by scanning the directory keyspace
1222                  * represented by the label.
1223                  */
1224                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1225                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1226                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1227                                       &error, 0);
1228                 hammer2_chain_lookup_done(parent);
1229                 if (schain == NULL) {
1230                         kprintf("hammer2_mount: invalid super-root\n");
1231                         hammer2_unmount_helper(mp, NULL, hmp);
1232                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1233                         hammer2_vfs_unmount(mp, MNT_FORCE);
1234                         return EINVAL;
1235                 }
1236                 if (schain->error) {
1237                         kprintf("hammer2_mount: error %s reading super-root\n",
1238                                 hammer2_error_str(schain->error));
1239                         hammer2_chain_unlock(schain);
1240                         hammer2_chain_drop(schain);
1241                         schain = NULL;
1242                         hammer2_unmount_helper(mp, NULL, hmp);
1243                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1244                         hammer2_vfs_unmount(mp, MNT_FORCE);
1245                         return EINVAL;
1246                 }
1247
1248                 /*
1249                  * The super-root always uses an inode_tid of 1 when
1250                  * creating PFSs.
1251                  */
1252                 spmp->inode_tid = 1;
1253                 spmp->modify_tid = schain->bref.modify_tid + 1;
1254
1255                 /*
1256                  * Sanity-check schain's pmp and finish initialization.
1257                  * Any chain belonging to the super-root topology should
1258                  * have a NULL pmp (not even set to spmp).
1259                  */
1260                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1261                 KKASSERT(schain->pmp == NULL);
1262                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1263
1264                 /*
1265                  * Replace the dummy spmp->iroot with a real one.  It's
1266                  * easier to just do a wholesale replacement than to try
1267                  * to update the chain and fixup the iroot fields.
1268                  *
1269                  * The returned inode is locked with the supplied cluster.
1270                  */
1271                 cluster = hammer2_cluster_from_chain(schain);
1272                 hammer2_inode_drop(spmp->iroot);
1273                 spmp->iroot = NULL;
1274                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1275                 spmp->spmp_hmp = hmp;
1276                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1277                 spmp->pfs_hmps[0] = hmp;
1278                 hammer2_inode_ref(spmp->iroot);
1279                 hammer2_inode_unlock(spmp->iroot);
1280                 hammer2_cluster_unlock(cluster);
1281                 hammer2_cluster_drop(cluster);
1282                 schain = NULL;
1283                 /* leave spmp->iroot with one ref */
1284
1285                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1286                         error = hammer2_recovery(hmp);
1287                         if (error == 0)
1288                                 error |= hammer2_fixup_pfses(hmp);
1289                         /* XXX do something with error */
1290                 }
1291                 hammer2_update_pmps(hmp);
1292                 hammer2_iocom_init(hmp);
1293                 hammer2_bulkfree_init(hmp);
1294
1295                 /*
1296                  * Ref the cluster management messaging descriptor.  The mount
1297                  * program deals with the other end of the communications pipe.
1298                  *
1299                  * Root mounts typically do not supply one.
1300                  */
1301                 if (info.cluster_fd >= 0) {
1302                         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1303                         if (fp) {
1304                                 hammer2_cluster_reconnect(hmp, fp);
1305                         } else {
1306                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1307                         }
1308                 }
1309         } else {
1310                 spmp = hmp->spmp;
1311                 if (info.hflags & HMNT2_DEVFLAGS) {
1312                         kprintf("hammer2: Warning: mount flags pertaining "
1313                                 "to the whole device may only be specified "
1314                                 "on the first mount of the device: %08x\n",
1315                                 info.hflags & HMNT2_DEVFLAGS);
1316                 }
1317         }
1318
1319         /*
1320          * Force local mount (disassociate all PFSs from their clusters).
1321          * Used primarily for debugging.
1322          */
1323         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1324
1325         /*
1326          * Lookup the mount point under the media-localized super-root.
1327          * Scanning hammer2_pfslist doesn't help us because it represents
1328          * PFS cluster ids which can aggregate several named PFSs together.
1329          *
1330          * cluster->pmp will incorrectly point to spmp and must be fixed
1331          * up later on.
1332          */
1333         hammer2_inode_lock(spmp->iroot, 0);
1334         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1335         lhc = hammer2_dirhash(label, strlen(label));
1336         chain = hammer2_chain_lookup(&parent, &key_next,
1337                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1338                                      &error, 0);
1339         while (chain) {
1340                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1341                     strcmp(label, chain->data->ipdata.filename) == 0) {
1342                         break;
1343                 }
1344                 chain = hammer2_chain_next(&parent, chain, &key_next,
1345                                             key_next,
1346                                             lhc + HAMMER2_DIRHASH_LOMASK,
1347                                             &error, 0);
1348         }
1349         if (parent) {
1350                 hammer2_chain_unlock(parent);
1351                 hammer2_chain_drop(parent);
1352         }
1353         hammer2_inode_unlock(spmp->iroot);
1354
1355         /*
1356          * PFS could not be found?
1357          */
1358         if (chain == NULL) {
1359                 if (error)
1360                         kprintf("hammer2_mount: PFS label I/O error\n");
1361                 else
1362                         kprintf("hammer2_mount: PFS label not found\n");
1363                 hammer2_unmount_helper(mp, NULL, hmp);
1364                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1365                 hammer2_vfs_unmount(mp, MNT_FORCE);
1366
1367                 return EINVAL;
1368         }
1369
1370         /*
1371          * Acquire the pmp structure (it should have already been allocated
1372          * via hammer2_update_pmps() so do not pass cluster in to add to
1373          * available chains).
1374          *
1375          * Check if the cluster has already been mounted.  A cluster can
1376          * only be mounted once, use null mounts to mount additional copies.
1377          */
1378         if (chain->error) {
1379                 kprintf("hammer2_mount: PFS label I/O error\n");
1380         } else {
1381                 ripdata = &chain->data->ipdata;
1382                 bref = chain->bref;
1383                 pmp = hammer2_pfsalloc(NULL, ripdata,
1384                                        bref.modify_tid, force_local);
1385         }
1386         hammer2_chain_unlock(chain);
1387         hammer2_chain_drop(chain);
1388
1389         /*
1390          * Finish the mount
1391          */
1392         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1393
1394         if (pmp->mp) {
1395                 kprintf("hammer2_mount: PFS already mounted!\n");
1396                 hammer2_unmount_helper(mp, NULL, hmp);
1397                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1398                 hammer2_vfs_unmount(mp, MNT_FORCE);
1399
1400                 return EBUSY;
1401         }
1402
1403         pmp->hflags = info.hflags;
1404         mp->mnt_flag |= MNT_LOCAL;
1405         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1406         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1407
1408         /*
1409          * required mount structure initializations
1410          */
1411         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1412         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1413
1414         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1415         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1416
1417         /*
1418          * Optional fields
1419          */
1420         mp->mnt_iosize_max = MAXPHYS;
1421
1422         /*
1423          * Connect up mount pointers.
1424          */
1425         hammer2_mount_helper(mp, pmp);
1426
1427         lockmgr(&hammer2_mntlk, LK_RELEASE);
1428
1429         /*
1430          * Finish setup
1431          */
1432         vfs_getnewfsid(mp);
1433         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1434         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1435         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1436
1437         if (path) {
1438                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1439                           MNAMELEN - 1, &size);
1440                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1441         } /* else root mount, already in there */
1442
1443         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1444         if (path) {
1445                 copyinstr(path, mp->mnt_stat.f_mntonname,
1446                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1447                           &size);
1448         } else {
1449                 /* root mount */
1450                 mp->mnt_stat.f_mntonname[0] = '/';
1451         }
1452
1453         /*
1454          * Initial statfs to prime mnt_stat.
1455          */
1456         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1457
1458         return 0;
1459 }
1460
1461 /*
1462  * Scan PFSs under the super-root and create hammer2_pfs structures.
1463  */
1464 static
1465 void
1466 hammer2_update_pmps(hammer2_dev_t *hmp)
1467 {
1468         const hammer2_inode_data_t *ripdata;
1469         hammer2_chain_t *parent;
1470         hammer2_chain_t *chain;
1471         hammer2_blockref_t bref;
1472         hammer2_dev_t *force_local;
1473         hammer2_pfs_t *spmp;
1474         hammer2_pfs_t *pmp;
1475         hammer2_key_t key_next;
1476         int error;
1477
1478         /*
1479          * Force local mount (disassociate all PFSs from their clusters).
1480          * Used primarily for debugging.
1481          */
1482         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1483
1484         /*
1485          * Lookup mount point under the media-localized super-root.
1486          *
1487          * cluster->pmp will incorrectly point to spmp and must be fixed
1488          * up later on.
1489          */
1490         spmp = hmp->spmp;
1491         hammer2_inode_lock(spmp->iroot, 0);
1492         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1493         chain = hammer2_chain_lookup(&parent, &key_next,
1494                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1495                                          &error, 0);
1496         while (chain) {
1497                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1498                         continue;
1499                 if (chain->error) {
1500                         kprintf("I/O error scanning PFS labels\n");
1501                 } else {
1502                         ripdata = &chain->data->ipdata;
1503                         bref = chain->bref;
1504
1505                         pmp = hammer2_pfsalloc(chain, ripdata,
1506                                                bref.modify_tid, force_local);
1507                 }
1508                 chain = hammer2_chain_next(&parent, chain, &key_next,
1509                                            key_next, HAMMER2_KEY_MAX,
1510                                            &error, 0);
1511         }
1512         if (parent) {
1513                 hammer2_chain_unlock(parent);
1514                 hammer2_chain_drop(parent);
1515         }
1516         hammer2_inode_unlock(spmp->iroot);
1517 }
1518
1519 static
1520 int
1521 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1522                 struct vnode *devvp, struct ucred *cred)
1523 {
1524         int error;
1525
1526         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1527                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1528                 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1529                 vn_unlock(devvp);
1530                 error = hammer2_recovery(hmp);
1531                 if (error == 0)
1532                         error |= hammer2_fixup_pfses(hmp);
1533                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1534                 if (error == 0) {
1535                         VOP_CLOSE(devvp, FREAD, NULL);
1536                         hmp->ronly = 0;
1537                 } else {
1538                         VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1539                 }
1540                 vn_unlock(devvp);
1541         } else {
1542                 error = 0;
1543         }
1544         return error;
1545 }
1546
1547 static
1548 int
1549 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1550 {
1551         hammer2_pfs_t *pmp;
1552         int flags;
1553         int error = 0;
1554
1555         pmp = MPTOPMP(mp);
1556
1557         if (pmp == NULL)
1558                 return(0);
1559
1560         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1561
1562         /*
1563          * If mount initialization proceeded far enough we must flush
1564          * its vnodes and sync the underlying mount points.  Three syncs
1565          * are required to fully flush the filesystem (freemap updates lag
1566          * by one flush, and one extra for safety).
1567          */
1568         if (mntflags & MNT_FORCE)
1569                 flags = FORCECLOSE;
1570         else
1571                 flags = 0;
1572         if (pmp->iroot) {
1573                 error = vflush(mp, 0, flags);
1574                 if (error)
1575                         goto failed;
1576                 hammer2_vfs_sync(mp, MNT_WAIT);
1577                 hammer2_vfs_sync(mp, MNT_WAIT);
1578                 hammer2_vfs_sync(mp, MNT_WAIT);
1579         }
1580
1581         /*
1582          * Cleanup the frontend support XOPS threads
1583          */
1584         hammer2_xop_helper_cleanup(pmp);
1585
1586         if (pmp->mp)
1587                 hammer2_unmount_helper(mp, pmp, NULL);
1588
1589         error = 0;
1590 failed:
1591         lockmgr(&hammer2_mntlk, LK_RELEASE);
1592
1593         return (error);
1594 }
1595
1596 /*
1597  * Mount helper, hook the system mount into our PFS.
1598  * The mount lock is held.
1599  *
1600  * We must bump the mount_count on related devices for any
1601  * mounted PFSs.
1602  */
1603 static
1604 void
1605 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1606 {
1607         hammer2_cluster_t *cluster;
1608         hammer2_chain_t *rchain;
1609         int i;
1610
1611         mp->mnt_data = (qaddr_t)pmp;
1612         pmp->mp = mp;
1613
1614         /*
1615          * After pmp->mp is set we have to adjust hmp->mount_count.
1616          */
1617         cluster = &pmp->iroot->cluster;
1618         for (i = 0; i < cluster->nchains; ++i) {
1619                 rchain = cluster->array[i].chain;
1620                 if (rchain == NULL)
1621                         continue;
1622                 ++rchain->hmp->mount_count;
1623         }
1624
1625         /*
1626          * Create missing Xop threads
1627          */
1628         hammer2_xop_helper_create(pmp);
1629 }
1630
1631 /*
1632  * Mount helper, unhook the system mount from our PFS.
1633  * The mount lock is held.
1634  *
1635  * If hmp is supplied a mount responsible for being the first to open
1636  * the block device failed and the block device and all PFSs using the
1637  * block device must be cleaned up.
1638  *
1639  * If pmp is supplied multiple devices might be backing the PFS and each
1640  * must be disconnected.  This might not be the last PFS using some of the
1641  * underlying devices.  Also, we have to adjust our hmp->mount_count
1642  * accounting for the devices backing the pmp which is now undergoing an
1643  * unmount.
1644  */
1645 static
1646 void
1647 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1648 {
1649         hammer2_cluster_t *cluster;
1650         hammer2_chain_t *rchain;
1651         struct vnode *devvp;
1652         int dumpcnt;
1653         int ronly;
1654         int i;
1655
1656         /*
1657          * If no device supplied this is a high-level unmount and we have to
1658          * to disconnect the mount, adjust mount_count, and locate devices
1659          * that might now have no mounts.
1660          */
1661         if (pmp) {
1662                 KKASSERT(hmp == NULL);
1663                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1664                 pmp->mp = NULL;
1665                 mp->mnt_data = NULL;
1666
1667                 /*
1668                  * After pmp->mp is cleared we have to account for
1669                  * mount_count.
1670                  */
1671                 cluster = &pmp->iroot->cluster;
1672                 for (i = 0; i < cluster->nchains; ++i) {
1673                         rchain = cluster->array[i].chain;
1674                         if (rchain == NULL)
1675                                 continue;
1676                         --rchain->hmp->mount_count;
1677                         /* scrapping hmp now may invalidate the pmp */
1678                 }
1679 again:
1680                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1681                         if (hmp->mount_count == 0) {
1682                                 hammer2_unmount_helper(NULL, NULL, hmp);
1683                                 goto again;
1684                         }
1685                 }
1686                 return;
1687         }
1688
1689         /*
1690          * Try to terminate the block device.  We can't terminate it if
1691          * there are still PFSs referencing it.
1692          */
1693         if (hmp->mount_count)
1694                 return;
1695
1696         /*
1697          * Decomission the network before we start messing with the
1698          * device and PFS.
1699          */
1700         hammer2_iocom_uninit(hmp);
1701
1702         hammer2_bulkfree_uninit(hmp);
1703         hammer2_pfsfree_scan(hmp, 0);
1704         hammer2_dev_exlock(hmp);        /* XXX order */
1705
1706         /*
1707          * Cycle the volume data lock as a safety (probably not needed any
1708          * more).  To ensure everything is out we need to flush at least
1709          * three times.  (1) The running of the sideq can dirty the
1710          * filesystem, (2) A normal flush can dirty the freemap, and
1711          * (3) ensure that the freemap is fully synchronized.
1712          *
1713          * The next mount's recovery scan can clean everything up but we want
1714          * to leave the filesystem in a 100% clean state on a normal unmount.
1715          */
1716 #if 0
1717         hammer2_voldata_lock(hmp);
1718         hammer2_voldata_unlock(hmp);
1719 #endif
1720
1721         /*
1722          * Flush whatever is left.  Unmounted but modified PFS's might still
1723          * have some dirty chains on them.
1724          */
1725         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1726         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1727
1728         if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1729                 hammer2_voldata_modify(hmp);
1730                 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1731                                             HAMMER2_FLUSH_ALL);
1732         }
1733         hammer2_chain_unlock(&hmp->fchain);
1734
1735         if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1736                 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1737                                             HAMMER2_FLUSH_ALL);
1738         }
1739         hammer2_chain_unlock(&hmp->vchain);
1740
1741         if ((hmp->vchain.flags | hmp->fchain.flags) &
1742             HAMMER2_CHAIN_FLUSH_MASK) {
1743                 kprintf("hammer2_unmount: chains left over "
1744                         "after final sync\n");
1745                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1746                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1747
1748                 if (hammer2_debug & 0x0010)
1749                         Debugger("entered debugger");
1750         }
1751
1752         hammer2_pfsfree_scan(hmp, 1);
1753
1754         KKASSERT(hmp->spmp == NULL);
1755
1756         /*
1757          * Finish up with the device vnode
1758          */
1759         if ((devvp = hmp->devvp) != NULL) {
1760                 ronly = hmp->ronly;
1761                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1762                 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1763                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1764                         ronly);
1765                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1766                 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1767                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1768                 hmp->devvp = NULL;
1769                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1770                 vn_unlock(devvp);
1771                 vrele(devvp);
1772                 devvp = NULL;
1773         }
1774
1775         /*
1776          * Clear vchain/fchain flags that might prevent final cleanup
1777          * of these chains.
1778          */
1779         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1780                 atomic_add_long(&hammer2_count_modified_chains, -1);
1781                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1782                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1783         }
1784         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1785                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1786         }
1787
1788         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1789                 atomic_add_long(&hammer2_count_modified_chains, -1);
1790                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1791                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1792         }
1793         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1794                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1795         }
1796
1797         /*
1798          * Final drop of embedded freemap root chain to
1799          * clean up fchain.core (fchain structure is not
1800          * flagged ALLOCATED so it is cleaned out and then
1801          * left to rot).
1802          */
1803         hammer2_chain_drop(&hmp->fchain);
1804
1805         /*
1806          * Final drop of embedded volume root chain to clean
1807          * up vchain.core (vchain structure is not flagged
1808          * ALLOCATED so it is cleaned out and then left to
1809          * rot).
1810          */
1811         dumpcnt = 50;
1812         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1);
1813         dumpcnt = 50;
1814         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1);
1815         hammer2_dev_unlock(hmp);
1816         hammer2_chain_drop(&hmp->vchain);
1817
1818         hammer2_io_cleanup(hmp, &hmp->iotree);
1819         if (hmp->iofree_count) {
1820                 kprintf("io_cleanup: %d I/O's left hanging\n",
1821                         hmp->iofree_count);
1822         }
1823
1824         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1825         kmalloc_destroy(&hmp->mchain);
1826         kfree(hmp, M_HAMMER2);
1827 }
1828
1829 int
1830 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1831                  ino_t ino, struct vnode **vpp)
1832 {
1833         hammer2_xop_lookup_t *xop;
1834         hammer2_pfs_t *pmp;
1835         hammer2_inode_t *ip;
1836         hammer2_tid_t inum;
1837         int error;
1838
1839         inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1840
1841         error = 0;
1842         pmp = MPTOPMP(mp);
1843
1844         /*
1845          * Easy if we already have it cached
1846          */
1847         ip = hammer2_inode_lookup(pmp, inum);
1848         if (ip) {
1849                 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1850                 *vpp = hammer2_igetv(ip, &error);
1851                 hammer2_inode_unlock(ip);
1852                 hammer2_inode_drop(ip);         /* from lookup */
1853
1854                 return error;
1855         }
1856
1857         /*
1858          * Otherwise we have to find the inode
1859          */
1860         xop = hammer2_xop_alloc(pmp->iroot, 0);
1861         xop->lhc = inum;
1862         hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1863         error = hammer2_xop_collect(&xop->head, 0);
1864
1865         if (error == 0) {
1866                 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1867                         kprintf("vget: no collect error but also no rdata\n");
1868                         kprintf("xop %p\n", xop);
1869                         while ((hammer2_debug & 0x80000) == 0) {
1870                                 tsleep(xop, PCATCH, "wait", hz * 10);
1871                         }
1872                         ip = NULL;
1873                 } else {
1874                         ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1875                 }
1876         }
1877         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1878
1879         if (ip) {
1880                 *vpp = hammer2_igetv(ip, &error);
1881                 hammer2_inode_unlock(ip);
1882         } else {
1883                 *vpp = NULL;
1884                 error = ENOENT;
1885         }
1886         return (error);
1887 }
1888
1889 static
1890 int
1891 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1892 {
1893         hammer2_pfs_t *pmp;
1894         struct vnode *vp;
1895         int error;
1896
1897         pmp = MPTOPMP(mp);
1898         if (pmp->iroot == NULL) {
1899                 *vpp = NULL;
1900                 return EINVAL;
1901         }
1902
1903         error = 0;
1904         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1905
1906         while (pmp->inode_tid == 0) {
1907                 hammer2_xop_ipcluster_t *xop;
1908                 hammer2_inode_meta_t *meta;
1909
1910                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1911                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1912                 error = hammer2_xop_collect(&xop->head, 0);
1913
1914                 if (error == 0) {
1915                         meta = &xop->head.cluster.focus->data->ipdata.meta;
1916                         pmp->iroot->meta = *meta;
1917                         pmp->inode_tid = meta->pfs_inum + 1;
1918                         if (pmp->inode_tid < HAMMER2_INODE_START)
1919                                 pmp->inode_tid = HAMMER2_INODE_START;
1920                         pmp->modify_tid =
1921                                 xop->head.cluster.focus->bref.modify_tid + 1;
1922 #if 0
1923                         kprintf("PFS: Starting inode %jd\n",
1924                                 (intmax_t)pmp->inode_tid);
1925                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1926                                 pmp->inode_tid, pmp->modify_tid);
1927 #endif
1928                         wakeup(&pmp->iroot);
1929
1930                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1931
1932                         /*
1933                          * Prime the mount info.
1934                          */
1935                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1936                         break;
1937                 }
1938
1939                 /*
1940                  * Loop, try again
1941                  */
1942                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1943                 hammer2_inode_unlock(pmp->iroot);
1944                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1945                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1946                 if (error == EINTR)
1947                         break;
1948         }
1949
1950         if (error) {
1951                 hammer2_inode_unlock(pmp->iroot);
1952                 *vpp = NULL;
1953         } else {
1954                 vp = hammer2_igetv(pmp->iroot, &error);
1955                 hammer2_inode_unlock(pmp->iroot);
1956                 *vpp = vp;
1957         }
1958
1959         return (error);
1960 }
1961
1962 /*
1963  * Filesystem status
1964  *
1965  * XXX incorporate ipdata->meta.inode_quota and data_quota
1966  */
1967 static
1968 int
1969 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1970 {
1971         hammer2_pfs_t *pmp;
1972         hammer2_dev_t *hmp;
1973         hammer2_blockref_t bref;
1974         struct statfs tmp;
1975         int i;
1976
1977         /*
1978          * NOTE: iroot might not have validated the cluster yet.
1979          */
1980         pmp = MPTOPMP(mp);
1981
1982         bzero(&tmp, sizeof(tmp));
1983
1984         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1985                 hmp = pmp->pfs_hmps[i];
1986                 if (hmp == NULL)
1987                         continue;
1988                 if (pmp->iroot->cluster.array[i].chain)
1989                         bref = pmp->iroot->cluster.array[i].chain->bref;
1990                 else
1991                         bzero(&bref, sizeof(bref));
1992
1993                 tmp.f_files = bref.embed.stats.inode_count;
1994                 tmp.f_ffree = 0;
1995                 tmp.f_blocks = hmp->voldata.allocator_size /
1996                                mp->mnt_vstat.f_bsize;
1997                 tmp.f_bfree = hmp->voldata.allocator_free /
1998                               mp->mnt_vstat.f_bsize;
1999                 tmp.f_bavail = tmp.f_bfree;
2000
2001                 if (cred && cred->cr_uid != 0) {
2002                         uint64_t adj;
2003
2004                         /* 5% */
2005                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2006                         tmp.f_blocks -= adj;
2007                         tmp.f_bfree -= adj;
2008                         tmp.f_bavail -= adj;
2009                 }
2010
2011                 mp->mnt_stat.f_blocks = tmp.f_blocks;
2012                 mp->mnt_stat.f_bfree = tmp.f_bfree;
2013                 mp->mnt_stat.f_bavail = tmp.f_bavail;
2014                 mp->mnt_stat.f_files = tmp.f_files;
2015                 mp->mnt_stat.f_ffree = tmp.f_ffree;
2016
2017                 *sbp = mp->mnt_stat;
2018         }
2019         return (0);
2020 }
2021
2022 static
2023 int
2024 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2025 {
2026         hammer2_pfs_t *pmp;
2027         hammer2_dev_t *hmp;
2028         hammer2_blockref_t bref;
2029         struct statvfs tmp;
2030         int i;
2031
2032         /*
2033          * NOTE: iroot might not have validated the cluster yet.
2034          */
2035         pmp = MPTOPMP(mp);
2036         bzero(&tmp, sizeof(tmp));
2037
2038         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2039                 hmp = pmp->pfs_hmps[i];
2040                 if (hmp == NULL)
2041                         continue;
2042                 if (pmp->iroot->cluster.array[i].chain)
2043                         bref = pmp->iroot->cluster.array[i].chain->bref;
2044                 else
2045                         bzero(&bref, sizeof(bref));
2046
2047                 tmp.f_files = bref.embed.stats.inode_count;
2048                 tmp.f_ffree = 0;
2049                 tmp.f_blocks = hmp->voldata.allocator_size /
2050                                mp->mnt_vstat.f_bsize;
2051                 tmp.f_bfree = hmp->voldata.allocator_free /
2052                               mp->mnt_vstat.f_bsize;
2053                 tmp.f_bavail = tmp.f_bfree;
2054
2055                 if (cred && cred->cr_uid != 0) {
2056                         uint64_t adj;
2057
2058                         /* 5% */
2059                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2060                         tmp.f_blocks -= adj;
2061                         tmp.f_bfree -= adj;
2062                         tmp.f_bavail -= adj;
2063                 }
2064
2065                 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2066                 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2067                 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2068                 mp->mnt_vstat.f_files = tmp.f_files;
2069                 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2070
2071                 *sbp = mp->mnt_vstat;
2072         }
2073         return (0);
2074 }
2075
2076 /*
2077  * Mount-time recovery (RW mounts)
2078  *
2079  * Updates to the free block table are allowed to lag flushes by one
2080  * transaction.  In case of a crash, then on a fresh mount we must do an
2081  * incremental scan of the last committed transaction id and make sure that
2082  * all related blocks have been marked allocated.
2083  *
2084  * The super-root topology and each PFS has its own transaction id domain,
2085  * so we must track PFS boundary transitions.
2086  */
2087 struct hammer2_recovery_elm {
2088         TAILQ_ENTRY(hammer2_recovery_elm) entry;
2089         hammer2_chain_t *chain;
2090         hammer2_tid_t sync_tid;
2091 };
2092
2093 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2094
2095 struct hammer2_recovery_info {
2096         struct hammer2_recovery_list list;
2097         hammer2_tid_t   mtid;
2098         int     depth;
2099 };
2100
2101 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2102                         hammer2_chain_t *parent,
2103                         struct hammer2_recovery_info *info,
2104                         hammer2_tid_t sync_tid);
2105
2106 #define HAMMER2_RECOVERY_MAXDEPTH       10
2107
2108 static
2109 int
2110 hammer2_recovery(hammer2_dev_t *hmp)
2111 {
2112         struct hammer2_recovery_info info;
2113         struct hammer2_recovery_elm *elm;
2114         hammer2_chain_t *parent;
2115         hammer2_tid_t sync_tid;
2116         hammer2_tid_t mirror_tid;
2117         int error;
2118
2119         hammer2_trans_init(hmp->spmp, 0);
2120
2121         sync_tid = hmp->voldata.freemap_tid;
2122         mirror_tid = hmp->voldata.mirror_tid;
2123
2124         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2125         if (sync_tid >= mirror_tid) {
2126                 kprintf(" no recovery needed\n");
2127         } else {
2128                 kprintf(" freemap recovery %016jx-%016jx\n",
2129                         sync_tid + 1, mirror_tid);
2130         }
2131
2132         TAILQ_INIT(&info.list);
2133         info.depth = 0;
2134         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2135         error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2136         hammer2_chain_lookup_done(parent);
2137
2138         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2139                 TAILQ_REMOVE(&info.list, elm, entry);
2140                 parent = elm->chain;
2141                 sync_tid = elm->sync_tid;
2142                 kfree(elm, M_HAMMER2);
2143
2144                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2145                 error |= hammer2_recovery_scan(hmp, parent, &info,
2146                                               hmp->voldata.freemap_tid);
2147                 hammer2_chain_unlock(parent);
2148                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
2149         }
2150
2151         hammer2_trans_done(hmp->spmp);
2152
2153         return error;
2154 }
2155
2156 static
2157 int
2158 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2159                       struct hammer2_recovery_info *info,
2160                       hammer2_tid_t sync_tid)
2161 {
2162         const hammer2_inode_data_t *ripdata;
2163         hammer2_chain_t *chain;
2164         hammer2_blockref_t bref;
2165         int tmp_error;
2166         int rup_error;
2167         int error;
2168         int first;
2169
2170         /*
2171          * Adjust freemap to ensure that the block(s) are marked allocated.
2172          */
2173         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2174                 hammer2_freemap_adjust(hmp, &parent->bref,
2175                                        HAMMER2_FREEMAP_DORECOVER);
2176         }
2177
2178         /*
2179          * Check type for recursive scan
2180          */
2181         switch(parent->bref.type) {
2182         case HAMMER2_BREF_TYPE_VOLUME:
2183                 /* data already instantiated */
2184                 break;
2185         case HAMMER2_BREF_TYPE_INODE:
2186                 /*
2187                  * Must instantiate data for DIRECTDATA test and also
2188                  * for recursion.
2189                  */
2190                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2191                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2192                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2193                         /* not applicable to recovery scan */
2194                         hammer2_chain_unlock(parent);
2195                         return 0;
2196                 }
2197                 hammer2_chain_unlock(parent);
2198                 break;
2199         case HAMMER2_BREF_TYPE_INDIRECT:
2200                 /*
2201                  * Must instantiate data for recursion
2202                  */
2203                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2204                 hammer2_chain_unlock(parent);
2205                 break;
2206         case HAMMER2_BREF_TYPE_DIRENT:
2207         case HAMMER2_BREF_TYPE_DATA:
2208         case HAMMER2_BREF_TYPE_FREEMAP:
2209         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2210         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2211                 /* not applicable to recovery scan */
2212                 return 0;
2213                 break;
2214         default:
2215                 return HAMMER2_ERROR_BADBREF;
2216         }
2217
2218         /*
2219          * Defer operation if depth limit reached or if we are crossing a
2220          * PFS boundary.
2221          */
2222         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2223                 struct hammer2_recovery_elm *elm;
2224
2225                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2226                 elm->chain = parent;
2227                 elm->sync_tid = sync_tid;
2228                 hammer2_chain_ref(parent);
2229                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2230                 /* unlocked by caller */
2231
2232                 return(0);
2233         }
2234
2235
2236         /*
2237          * Recursive scan of the last flushed transaction only.  We are
2238          * doing this without pmp assignments so don't leave the chains
2239          * hanging around after we are done with them.
2240          *
2241          * error        Cumulative error this level only
2242          * rup_error    Cumulative error for recursion
2243          * tmp_error    Specific non-cumulative recursion error
2244          */
2245         chain = NULL;
2246         first = 1;
2247         rup_error = 0;
2248         error = 0;
2249
2250         for (;;) {
2251                 error |= hammer2_chain_scan(parent, &chain, &bref,
2252                                             &first,
2253                                             HAMMER2_LOOKUP_NODATA);
2254
2255                 /*
2256                  * Problem during scan or EOF
2257                  */
2258                 if (error)
2259                         break;
2260
2261                 /*
2262                  * If this is a leaf
2263                  */
2264                 if (chain == NULL) {
2265                         if (bref.mirror_tid > sync_tid) {
2266                                 hammer2_freemap_adjust(hmp, &bref,
2267                                                      HAMMER2_FREEMAP_DORECOVER);
2268                         }
2269                         continue;
2270                 }
2271
2272                 /*
2273                  * This may or may not be a recursive node.
2274                  */
2275                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2276                 if (bref.mirror_tid > sync_tid) {
2277                         ++info->depth;
2278                         tmp_error = hammer2_recovery_scan(hmp, chain,
2279                                                            info, sync_tid);
2280                         --info->depth;
2281                 } else {
2282                         tmp_error = 0;
2283                 }
2284
2285                 /*
2286                  * Flush the recovery at the PFS boundary to stage it for
2287                  * the final flush of the super-root topology.
2288                  */
2289                 if (tmp_error == 0 &&
2290                     (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2291                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2292                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2293                                              HAMMER2_FLUSH_ALL);
2294                 }
2295                 rup_error |= tmp_error;
2296         }
2297         return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2298 }
2299
2300 /*
2301  * This fixes up an error introduced in earlier H2 implementations where
2302  * moving a PFS inode into an indirect block wound up causing the
2303  * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2304  */
2305 static
2306 int
2307 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2308 {
2309         const hammer2_inode_data_t *ripdata;
2310         hammer2_chain_t *parent;
2311         hammer2_chain_t *chain;
2312         hammer2_key_t key_next;
2313         hammer2_pfs_t *spmp;
2314         int error;
2315
2316         error = 0;
2317
2318         /*
2319          * Lookup mount point under the media-localized super-root.
2320          *
2321          * cluster->pmp will incorrectly point to spmp and must be fixed
2322          * up later on.
2323          */
2324         spmp = hmp->spmp;
2325         hammer2_inode_lock(spmp->iroot, 0);
2326         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2327         chain = hammer2_chain_lookup(&parent, &key_next,
2328                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2329                                          &error, 0);
2330         while (chain) {
2331                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2332                         continue;
2333                 if (chain->error) {
2334                         kprintf("I/O error scanning PFS labels\n");
2335                         error |= chain->error;
2336                 } else if ((chain->bref.flags &
2337                             HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2338                         int error2;
2339
2340                         ripdata = &chain->data->ipdata;
2341                         hammer2_trans_init(hmp->spmp, 0);
2342                         error2 = hammer2_chain_modify(chain,
2343                                                       chain->bref.modify_tid,
2344                                                       0, 0);
2345                         if (error2 == 0) {
2346                                 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2347                                         ripdata->filename);
2348                                 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2349                         } else {
2350                                 error |= error2;
2351                         }
2352                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2353                                              HAMMER2_FLUSH_ALL);
2354                         hammer2_trans_done(hmp->spmp);
2355                 }
2356                 chain = hammer2_chain_next(&parent, chain, &key_next,
2357                                            key_next, HAMMER2_KEY_MAX,
2358                                            &error, 0);
2359         }
2360         if (parent) {
2361                 hammer2_chain_unlock(parent);
2362                 hammer2_chain_drop(parent);
2363         }
2364         hammer2_inode_unlock(spmp->iroot);
2365
2366         return error;
2367 }
2368
2369 /*
2370  * Sync a mount point; this is called periodically on a per-mount basis from
2371  * the filesystem syncer, and whenever a user issues a sync.
2372  */
2373 int
2374 hammer2_vfs_sync(struct mount *mp, int waitfor)
2375 {
2376         hammer2_xop_flush_t *xop;
2377         struct hammer2_sync_info info;
2378         hammer2_inode_t *iroot;
2379         hammer2_pfs_t *pmp;
2380         int flags;
2381         int error;
2382
2383         pmp = MPTOPMP(mp);
2384         iroot = pmp->iroot;
2385         KKASSERT(iroot);
2386         KKASSERT(iroot->pmp == pmp);
2387
2388         /*
2389          * We can't acquire locks on existing vnodes while in a transaction
2390          * without risking a deadlock.  This assumes that vfsync() can be
2391          * called without the vnode locked (which it can in DragonFly).
2392          * Otherwise we'd have to implement a multi-pass or flag the lock
2393          * failures and retry.
2394          *
2395          * The reclamation code interlocks with the sync list's token
2396          * (by removing the vnode from the scan list) before unlocking
2397          * the inode, giving us time to ref the inode.
2398          */
2399         /*flags = VMSC_GETVP;*/
2400         flags = 0;
2401         if (waitfor & MNT_LAZY)
2402                 flags |= VMSC_ONEPASS;
2403
2404         /*
2405          * Flush vnodes individually using a normal transaction to avoid
2406          * stalling any concurrent operations.  This will flush the related
2407          * buffer cache buffers and inodes to the media.
2408          *
2409          * For efficiency do an async pass before making sure with a
2410          * synchronous pass on all related buffer cache buffers.
2411          */
2412         hammer2_trans_init(pmp, 0);
2413
2414         info.error = 0;
2415
2416         info.waitfor = MNT_NOWAIT;
2417         info.pass = 1;
2418         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2419
2420         /*
2421          * Now do two passes making sure we get everything.  The first pass
2422          * vfsync()s dirty vnodes.  The second pass waits for their I/O's
2423          * to finish and cleans up the dirty flag on the vnode.
2424          */
2425         info.pass = 1;
2426         info.waitfor = MNT_WAIT;
2427         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2428
2429         info.pass = 2;
2430         info.waitfor = MNT_WAIT;
2431         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2432
2433         /*
2434          * We must also run the sideq to handle any disconnected inodes
2435          * as the vnode scan will not see these.
2436          */
2437         hammer2_inode_run_sideq(pmp, 1);
2438         hammer2_trans_done(pmp);
2439
2440         /*
2441          * Start our flush transaction and flush the root topology down to
2442          * the inodes, but not the inodes themselves (which we already flushed
2443          * above).  Any concurrent activity effecting inode contents will not
2444          *
2445          * The flush sequence will
2446          *
2447          * NOTE! It is still possible for the paging code to push pages
2448          *       out via a UIO_NOCOPY hammer2_vop_write() during the main
2449          *       flush.
2450          */
2451         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2452
2453         /*
2454          * sync dirty vnodes again while in the flush transaction.  This is
2455          * currently an expensive shim to makre sure the logical topology is
2456          * completely consistent before we flush the volume header.
2457          */
2458         info.pass = 1;
2459         info.waitfor = MNT_WAIT;
2460         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2461
2462         info.pass = 2;
2463         info.waitfor = MNT_WAIT;
2464         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2465
2466         /*
2467          * Use the XOP interface to concurrently flush all nodes to
2468          * synchronize the PFSROOT subtopology to the media.  A standard
2469          * end-of-scan ENOENT error indicates cluster sufficiency.
2470          *
2471          * Note that this flush will not be visible on crash recovery until
2472          * we flush the super-root topology in the next loop.
2473          *
2474          * XXX For now wait for all flushes to complete.
2475          */
2476         if (iroot) {
2477                 /*
2478                  * If unmounting try to flush everything including any
2479                  * sub-trees under inodes, just in case there is dangling
2480                  * modified data, as a safety.  Otherwise just flush up to
2481                  * the inodes in this stage.
2482                  */
2483                 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
2484                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2485                                                        HAMMER2_XOP_VOLHDR);
2486                 } else {
2487                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2488                                                        HAMMER2_XOP_INODE_STOP |
2489                                                        HAMMER2_XOP_VOLHDR);
2490                 }
2491                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2492                 error = hammer2_xop_collect(&xop->head,
2493                                             HAMMER2_XOP_COLLECT_WAITALL);
2494                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2495                 if (error == HAMMER2_ERROR_ENOENT)
2496                         error = 0;
2497                 else
2498                         error = hammer2_error_to_errno(error);
2499         } else {
2500                 error = 0;
2501         }
2502         hammer2_trans_done(pmp);
2503
2504         return (error);
2505 }
2506
2507 /*
2508  * Sync passes.
2509  *
2510  * Note that we ignore the tranasction mtid we got above.  Instead,
2511  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2512  * transactions.
2513  *
2514  * WARNING! The frontend might be waiting on chnmem (limit_dirty_chains)
2515  * while holding a vnode locked.  When this situation occurs we cannot
2516  * safely test whether it is ok to clear the dirty bit on the vnode.
2517  * However, we can still flush the inode's topology.
2518  */
2519 static int
2520 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2521 {
2522         struct hammer2_sync_info *info = data;
2523         hammer2_inode_t *ip;
2524         int error;
2525
2526         /*
2527          * Degenerate cases.  Note that ip == NULL typically means the
2528          * syncer vnode itself and we don't want to vclrisdirty() in that
2529          * situation.
2530          */
2531         ip = VTOI(vp);
2532         if (ip == NULL) {
2533                 return(0);
2534         }
2535         if (vp->v_type == VNON || vp->v_type == VBAD) {
2536                 vclrisdirty(vp);
2537                 return(0);
2538         }
2539
2540         /*
2541          * Synchronize the buffer cche and inode meta-data to the backing
2542          * chain topology.
2543          *
2544          * vfsync is not necessarily synchronous, so it is best NOT to try
2545          * to flush the backing topology to media at this point.
2546          */
2547         hammer2_inode_ref(ip);
2548         if ((ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) ||
2549             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2550                 if (info->pass == 1)
2551                         vfsync(vp, info->waitfor, 1, NULL, NULL);
2552                 else
2553                         bio_track_wait(&vp->v_track_write, 0, 0);
2554         }
2555         if (info->pass == 2 && (vp->v_flag & VISDIRTY)) {
2556                 /*
2557                  * v_token is needed to interlock v_rbdirty_tree.
2558                  */
2559                 lwkt_gettoken(&vp->v_token);
2560                 hammer2_inode_lock(ip, 0);
2561                 hammer2_inode_chain_sync(ip);
2562                 hammer2_inode_chain_flush(ip);
2563                 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2564                                   HAMMER2_INODE_RESIZED |
2565                                   HAMMER2_INODE_DIRTYDATA)) == 0 &&
2566                     RB_EMPTY(&vp->v_rbdirty_tree) &&
2567                     !bio_track_active(&vp->v_track_write)) {
2568                         vclrisdirty(vp);
2569                 }
2570                 hammer2_inode_unlock(ip);
2571                 lwkt_reltoken(&vp->v_token);
2572         }
2573         hammer2_inode_drop(ip);
2574 #if 1
2575         error = 0;
2576         if (error)
2577                 info->error = error;
2578 #endif
2579         return(0);
2580 }
2581
2582 static
2583 int
2584 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2585 {
2586         hammer2_inode_t *ip;
2587
2588         KKASSERT(MAXFIDSZ >= 16);
2589         ip = VTOI(vp);
2590         fhp->fid_len = offsetof(struct fid, fid_data[16]);
2591         fhp->fid_ext = 0;
2592         ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2593         ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2594
2595         return 0;
2596 }
2597
2598 static
2599 int
2600 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2601                struct fid *fhp, struct vnode **vpp)
2602 {
2603         hammer2_pfs_t *pmp;
2604         hammer2_tid_t inum;
2605         int error;
2606
2607         pmp = MPTOPMP(mp);
2608         inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2609         if (vpp) {
2610                 if (inum == 1)
2611                         error = hammer2_vfs_root(mp, vpp);
2612                 else
2613                         error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2614         } else {
2615                 error = 0;
2616         }
2617         if (error)
2618                 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2619         return error;
2620 }
2621
2622 static
2623 int
2624 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2625                  int *exflagsp, struct ucred **credanonp)
2626 {
2627         hammer2_pfs_t *pmp;
2628         struct netcred *np;
2629         int error;
2630
2631         pmp = MPTOPMP(mp);
2632         np = vfs_export_lookup(mp, &pmp->export, nam);
2633         if (np) {
2634                 *exflagsp = np->netc_exflags;
2635                 *credanonp = &np->netc_anon;
2636                 error = 0;
2637         } else {
2638                 error = EACCES;
2639         }
2640         return error;
2641 }
2642
2643 /*
2644  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2645  * header into the HMP
2646  *
2647  * XXX read four volhdrs and use the one with the highest TID whos CRC
2648  *     matches.
2649  *
2650  * XXX check iCRCs.
2651  *
2652  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2653  *     nonexistant locations.
2654  *
2655  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2656  */
2657 static
2658 int
2659 hammer2_install_volume_header(hammer2_dev_t *hmp)
2660 {
2661         hammer2_volume_data_t *vd;
2662         struct buf *bp;
2663         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2664         int error_reported;
2665         int error;
2666         int valid;
2667         int i;
2668
2669         error_reported = 0;
2670         error = 0;
2671         valid = 0;
2672         bp = NULL;
2673
2674         /*
2675          * There are up to 4 copies of the volume header (syncs iterate
2676          * between them so there is no single master).  We don't trust the
2677          * volu_size field so we don't know precisely how large the filesystem
2678          * is, so depend on the OS to return an error if we go beyond the
2679          * block device's EOF.
2680          */
2681         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2682                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2683                               HAMMER2_VOLUME_BYTES, &bp);
2684                 if (error) {
2685                         brelse(bp);
2686                         bp = NULL;
2687                         continue;
2688                 }
2689
2690                 vd = (struct hammer2_volume_data *) bp->b_data;
2691                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2692                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2693                         brelse(bp);
2694                         bp = NULL;
2695                         continue;
2696                 }
2697
2698                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2699                         /* XXX: Reversed-endianness filesystem */
2700                         kprintf("hammer2: reverse-endian filesystem detected");
2701                         brelse(bp);
2702                         bp = NULL;
2703                         continue;
2704                 }
2705
2706                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2707                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2708                                       HAMMER2_VOLUME_ICRC0_SIZE);
2709                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2710                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2711                                        HAMMER2_VOLUME_ICRC1_SIZE);
2712                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2713                         kprintf("hammer2 volume header crc "
2714                                 "mismatch copy #%d %08x/%08x\n",
2715                                 i, crc0, crc);
2716                         error_reported = 1;
2717                         brelse(bp);
2718                         bp = NULL;
2719                         continue;
2720                 }
2721                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2722                         valid = 1;
2723                         hmp->voldata = *vd;
2724                         hmp->volhdrno = i;
2725                 }
2726                 brelse(bp);
2727                 bp = NULL;
2728         }
2729         if (valid) {
2730                 hmp->volsync = hmp->voldata;
2731                 hmp->free_reserved = hmp->voldata.allocator_size / 20;
2732                 error = 0;
2733                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2734                         kprintf("hammer2: using volume header #%d\n",
2735                                 hmp->volhdrno);
2736                 }
2737         } else {
2738                 error = EINVAL;
2739                 kprintf("hammer2: no valid volume headers found!\n");
2740         }
2741         return (error);
2742 }
2743
2744 /*
2745  * This handles hysteresis on regular file flushes.  Because the BIOs are
2746  * routed to a thread it is possible for an excessive number to build up
2747  * and cause long front-end stalls long before the runningbuffspace limit
2748  * is hit, so we implement hammer2_flush_pipe to control the
2749  * hysteresis.
2750  *
2751  * This is a particular problem when compression is used.
2752  */
2753 void
2754 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2755 {
2756         atomic_add_int(&pmp->count_lwinprog, 1);
2757 }
2758
2759 void
2760 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2761 {
2762         int lwinprog;
2763
2764         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2765         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2766             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2767                 atomic_clear_int(&pmp->count_lwinprog,
2768                                  HAMMER2_LWINPROG_WAITING);
2769                 wakeup(&pmp->count_lwinprog);
2770         }
2771         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2772             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2773                 atomic_clear_int(&pmp->count_lwinprog,
2774                                  HAMMER2_LWINPROG_WAITING0);
2775                 wakeup(&pmp->count_lwinprog);
2776         }
2777 }
2778
2779 void
2780 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2781 {
2782         int lwinprog;
2783         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2784                                     HAMMER2_LWINPROG_WAITING0;
2785
2786         for (;;) {
2787                 lwinprog = pmp->count_lwinprog;
2788                 cpu_ccfence();
2789                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2790                         break;
2791                 tsleep_interlock(&pmp->count_lwinprog, 0);
2792                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2793                 lwinprog = pmp->count_lwinprog;
2794                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2795                         break;
2796                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2797         }
2798 }
2799
2800 /*
2801  * Manage excessive memory resource use for chain and related
2802  * structures.
2803  */
2804 void
2805 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2806 {
2807         uint32_t waiting;
2808         uint32_t count;
2809         uint32_t limit;
2810 #if 0
2811         static int zzticks;
2812 #endif
2813
2814         /*
2815          * Atomic check condition and wait.  Also do an early speedup of
2816          * the syncer to try to avoid hitting the wait.
2817          */
2818         for (;;) {
2819                 waiting = pmp->inmem_dirty_chains;
2820                 cpu_ccfence();
2821                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2822
2823                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2824                 if (limit < hammer2_limit_dirty_chains)
2825                         limit = hammer2_limit_dirty_chains;
2826                 if (limit < 1000)
2827                         limit = 1000;
2828
2829 #if 0
2830                 if ((int)(ticks - zzticks) > hz) {
2831                         zzticks = ticks;
2832                         kprintf("count %ld %ld\n", count, limit);
2833                 }
2834 #endif
2835
2836                 /*
2837                  * Block if there are too many dirty chains present, wait
2838                  * for the flush to clean some out.
2839                  */
2840                 if (count > limit) {
2841                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2842                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2843                                                waiting,
2844                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2845                                 speedup_syncer(pmp->mp);
2846                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2847                                        "chnmem", hz);
2848                         }
2849                         continue;       /* loop on success or fail */
2850                 }
2851
2852                 /*
2853                  * Try to start an early flush before we are forced to block.
2854                  */
2855                 if (count > limit * 5 / 10)
2856                         speedup_syncer(pmp->mp);
2857                 break;
2858         }
2859 }
2860
2861 void
2862 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2863 {
2864         if (pmp) {
2865                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2866         }
2867 }
2868
2869 void
2870 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2871 {
2872         uint32_t waiting;
2873
2874         if (pmp) {
2875                 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1);
2876                 /* don't need --waiting to test flag */
2877                 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) {
2878                         atomic_clear_int(&pmp->inmem_dirty_chains,
2879                                          HAMMER2_DIRTYCHAIN_WAITING);
2880                         wakeup(&pmp->inmem_dirty_chains);
2881                 }
2882         }
2883 }
2884
2885 /*
2886  * Returns 0 if the filesystem has tons of free space
2887  * Returns 1 if the filesystem has less than 10% remaining
2888  * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
2889  */
2890 int
2891 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
2892 {
2893         hammer2_pfs_t *pmp;
2894         hammer2_dev_t *hmp;
2895         hammer2_off_t free_reserved;
2896         hammer2_off_t free_nominal;
2897         int i;
2898
2899         pmp = ip->pmp;
2900
2901         if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
2902                 free_reserved = HAMMER2_SEGSIZE;
2903                 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
2904                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2905                         hmp = pmp->pfs_hmps[i];
2906                         if (hmp == NULL)
2907                                 continue;
2908                         if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
2909                             pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
2910                                 continue;
2911
2912                         if (free_nominal > hmp->voldata.allocator_free)
2913                                 free_nominal = hmp->voldata.allocator_free;
2914                         if (free_reserved < hmp->free_reserved)
2915                                 free_reserved = hmp->free_reserved;
2916                 }
2917
2918                 /*
2919                  * SMP races ok
2920                  */
2921                 pmp->free_reserved = free_reserved;
2922                 pmp->free_nominal = free_nominal;
2923                 pmp->free_ticks = ticks;
2924         } else {
2925                 free_reserved = pmp->free_reserved;
2926                 free_nominal = pmp->free_nominal;
2927         }
2928         if (cred && cred->cr_uid != 0) {
2929                 if ((int64_t)(free_nominal - bytes) <
2930                     (int64_t)free_reserved) {
2931                         return 2;
2932                 }
2933         } else {
2934                 if ((int64_t)(free_nominal - bytes) <
2935                     (int64_t)free_reserved / 2) {
2936                         return 2;
2937                 }
2938         }
2939         if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
2940                 return 1;
2941         return 0;
2942 }
2943
2944 /*
2945  * Debugging
2946  */
2947 void
2948 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx,
2949                    u_int flags)
2950 {
2951         hammer2_chain_t *scan;
2952         hammer2_chain_t *parent;
2953
2954         --*countp;
2955         if (*countp == 0) {
2956                 kprintf("%*.*s...\n", tab, tab, "");
2957                 return;
2958         }
2959         if (*countp < 0)
2960                 return;
2961         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2962                 tab, tab, "", pfx,
2963                 chain, chain->bref.type,
2964                 chain->bref.key, chain->bref.keybits,
2965                 chain->bref.mirror_tid);
2966
2967         kprintf("%*.*s      [%08x] (%s) refs=%d",
2968                 tab, tab, "",
2969                 chain->flags,
2970                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2971                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2972                 chain->refs);
2973
2974         parent = chain->parent;
2975         if (parent)
2976                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2977                         tab, tab, "",
2978                         parent, parent->flags, parent->refs);
2979         if (RB_EMPTY(&chain->core.rbtree)) {
2980                 kprintf("\n");
2981         } else {
2982                 kprintf(" {\n");
2983                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) {
2984                         if ((scan->flags & flags) || flags == (u_int)-1) {
2985                                 hammer2_dump_chain(scan, tab + 4, countp, 'a',
2986                                                    flags);
2987                         }
2988                 }
2989                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2990                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2991                                 chain->data->ipdata.filename);
2992                 else
2993                         kprintf("%*.*s}\n", tab, tab, "");
2994         }
2995 }