sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         int error;
  71         int waitfor;
  72 };
  73
  74 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  75 static struct hammer2_mntlist hammer2_mntlist;
  76
  77 struct hammer2_pfslist hammer2_pfslist;
  78 struct lock hammer2_mntlk;
  79
  80 int hammer2_debug;
  81 int hammer2_cluster_read = 4;           /* physical read-ahead */
  82 int hammer2_cluster_write = 0;          /* bdwrite() so later inval works */
  83 int hammer2_dedup_enable = 1;
  84 int hammer2_always_compress = 0;        /* always try to compress */
  85 int hammer2_inval_enable = 0;
  86 int hammer2_flush_pipe = 100;
  87 int hammer2_synchronous_flush = 1;
  88 int hammer2_dio_count;
  89 int hammer2_limit_dio = 256;
  90 long hammer2_chain_allocs;
  91 long hammer2_chain_frees;
  92 long hammer2_limit_dirty_chains;
  93 long hammer2_count_modified_chains;
  94 long hammer2_iod_invals;
  95 long hammer2_iod_file_read;
  96 long hammer2_iod_meta_read;
  97 long hammer2_iod_indr_read;
  98 long hammer2_iod_fmap_read;
  99 long hammer2_iod_volu_read;
 100 long hammer2_iod_file_write;
 101 long hammer2_iod_file_wembed;
 102 long hammer2_iod_file_wzero;
 103 long hammer2_iod_file_wdedup;
 104 long hammer2_iod_meta_write;
 105 long hammer2_iod_indr_write;
 106 long hammer2_iod_fmap_write;
 107 long hammer2_iod_volu_write;
 108
 109 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 110 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 111                 "Buffer used for compression.");
 112
 113 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 114 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 115                 "Buffer used for decompression.");
 116
 117 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 118
 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 120            &hammer2_debug, 0, "");
 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_read, CTLFLAG_RW,
 122            &hammer2_cluster_read, 0, "");
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW,
 124            &hammer2_cluster_write, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
 126            &hammer2_dedup_enable, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
 128            &hammer2_always_compress, 0, "");
 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
 130            &hammer2_inval_enable, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 132            &hammer2_flush_pipe, 0, "");
 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 134            &hammer2_synchronous_flush, 0, "");
 135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
 136            &hammer2_chain_allocs, 0, "");
 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
 138            &hammer2_chain_frees, 0, "");
 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 140            &hammer2_limit_dirty_chains, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 142            &hammer2_count_modified_chains, 0, "");
 143 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 144            &hammer2_dio_count, 0, "");
 145 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_dio, CTLFLAG_RW,
 146            &hammer2_limit_dio, 0, "");
 147
 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
 149            &hammer2_iod_invals, 0, "");
 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 151            &hammer2_iod_file_read, 0, "");
 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 153            &hammer2_iod_meta_read, 0, "");
 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 155            &hammer2_iod_indr_read, 0, "");
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 157            &hammer2_iod_fmap_read, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 159            &hammer2_iod_volu_read, 0, "");
 160
 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 162            &hammer2_iod_file_write, 0, "");
 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 164            &hammer2_iod_file_wembed, 0, "");
 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 166            &hammer2_iod_file_wzero, 0, "");
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 168            &hammer2_iod_file_wdedup, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 170            &hammer2_iod_meta_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 172            &hammer2_iod_indr_write, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 174            &hammer2_iod_fmap_write, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 176            &hammer2_iod_volu_write, 0, "");
 177
 178 long hammer2_check_icrc32;
 179 long hammer2_check_xxhash64;
 180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW,
 181            &hammer2_check_icrc32, 0, "");
 182 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW,
 183            &hammer2_check_xxhash64, 0, "");
 184
 185 static int hammer2_vfs_init(struct vfsconf *conf);
 186 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 187 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 188                                 struct ucred *cred);
 189 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 190                                 struct vnode *, struct ucred *);
 191 static int hammer2_recovery(hammer2_dev_t *hmp);
 192 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 193 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 194 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 195                                 struct ucred *cred);
 196 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 197                                 struct ucred *cred);
 198 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 199                                 struct fid *fhp, struct vnode **vpp);
 200 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 201 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 202                                 int *exflagsp, struct ucred **credanonp);
 203
 204 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 205 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 206
 207 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 208
 209 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 210 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 211                                 hammer2_dev_t *hmp);
 212
 213 /*
 214  * HAMMER2 vfs operations.
 215  */
 216 static struct vfsops hammer2_vfsops = {
 217         .vfs_init       = hammer2_vfs_init,
 218         .vfs_uninit     = hammer2_vfs_uninit,
 219         .vfs_sync       = hammer2_vfs_sync,
 220         .vfs_mount      = hammer2_vfs_mount,
 221         .vfs_unmount    = hammer2_vfs_unmount,
 222         .vfs_root       = hammer2_vfs_root,
 223         .vfs_statfs     = hammer2_vfs_statfs,
 224         .vfs_statvfs    = hammer2_vfs_statvfs,
 225         .vfs_vget       = hammer2_vfs_vget,
 226         .vfs_vptofh     = hammer2_vfs_vptofh,
 227         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 228         .vfs_checkexp   = hammer2_vfs_checkexp
 229 };
 230
 231 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 232
 233 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
 234 MODULE_VERSION(hammer2, 1);
 235
 236 static
 237 int
 238 hammer2_vfs_init(struct vfsconf *conf)
 239 {
 240         static struct objcache_malloc_args margs_read;
 241         static struct objcache_malloc_args margs_write;
 242         static struct objcache_malloc_args margs_vop;
 243
 244         int error;
 245
 246         error = 0;
 247
 248         /*
 249          * A large DIO cache is needed to retain dedup enablement masks.
 250          * The bulkfree code clears related masks as part of the disk block
 251          * recycling algorithm, preventing it from being used for a later
 252          * dedup.
 253          *
 254          * NOTE: A large buffer cache can actually interfere with dedup
 255          *       operation because we dedup based on media physical buffers
 256          *       and not logical buffers.  Try to make the DIO chace large
 257          *       enough to avoid this problem, but also cap it.
 258          */
 259         hammer2_limit_dio = nbuf * 2;
 260         if (hammer2_limit_dio > 100000)
 261                 hammer2_limit_dio = 100000;
 262
 263         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 264                 error = EINVAL;
 265         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 266                 error = EINVAL;
 267         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 268                 error = EINVAL;
 269
 270         if (error)
 271                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 272
 273         margs_read.objsize = 65536;
 274         margs_read.mtype = M_HAMMER2_DEBUFFER;
 275
 276         margs_write.objsize = 32768;
 277         margs_write.mtype = M_HAMMER2_CBUFFER;
 278
 279         margs_vop.objsize = sizeof(hammer2_xop_t);
 280         margs_vop.mtype = M_HAMMER2;
 281
 282         /*
 283          * Note thaht for the XOPS cache we want backing store allocations
 284          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 285          * confusion), so use the backing store function that does it.  This
 286          * means that initial XOPS objects are zerod but REUSED objects are
 287          * not.  So we are responsible for cleaning the object up sufficiently
 288          * for our needs before objcache_put()ing it back (typically just the
 289          * FIFO indices).
 290          */
 291         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 292                                 0, 1, NULL, NULL, NULL,
 293                                 objcache_malloc_alloc,
 294                                 objcache_malloc_free,
 295                                 &margs_read);
 296         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 297                                 0, 1, NULL, NULL, NULL,
 298                                 objcache_malloc_alloc,
 299                                 objcache_malloc_free,
 300                                 &margs_write);
 301         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 302                                 0, 1, NULL, NULL, NULL,
 303                                 objcache_malloc_alloc_zero,
 304                                 objcache_malloc_free,
 305                                 &margs_vop);
 306
 307
 308         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 309         TAILQ_INIT(&hammer2_mntlist);
 310         TAILQ_INIT(&hammer2_pfslist);
 311
 312         hammer2_limit_dirty_chains = maxvnodes / 10;
 313         if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
 314                 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
 315
 316         return (error);
 317 }
 318
 319 static
 320 int
 321 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 322 {
 323         objcache_destroy(cache_buffer_read);
 324         objcache_destroy(cache_buffer_write);
 325         objcache_destroy(cache_xops);
 326         return 0;
 327 }
 328
 329 /*
 330  * Core PFS allocator.  Used to allocate or reference the pmp structure
 331  * for PFS cluster mounts and the spmp structure for media (hmp) structures.
 332  * The pmp can be passed in or loaded by this function using the chain and
 333  * inode data.
 334  *
 335  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 336  * transactions.  Note that synchronization does not use this field.
 337  * (typically frontend operations and synchronization cannot run on the
 338  * same PFS node at the same time).
 339  *
 340  * XXX check locking
 341  */
 342 hammer2_pfs_t *
 343 hammer2_pfsalloc(hammer2_chain_t *chain,
 344                  const hammer2_inode_data_t *ripdata,
 345                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 346 {
 347         hammer2_pfs_t *pmp;
 348         hammer2_inode_t *iroot;
 349         int count;
 350         int i;
 351         int j;
 352
 353         pmp = NULL;
 354
 355         /*
 356          * Locate or create the PFS based on the cluster id.  If ripdata
 357          * is NULL this is a spmp which is unique and is always allocated.
 358          *
 359          * If the device is mounted in local mode all PFSs are considered
 360          * independent and not part of any cluster (for debugging only).
 361          */
 362         if (ripdata) {
 363                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 364                         if (force_local != pmp->force_local)
 365                                 continue;
 366                         if (force_local == NULL &&
 367                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 368                                  sizeof(pmp->pfs_clid)) == 0) {
 369                                         break;
 370                         } else if (force_local && pmp->pfs_names[0] &&
 371                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 372                                         break;
 373                         }
 374                 }
 375         }
 376
 377         if (pmp == NULL) {
 378                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 379                 pmp->force_local = force_local;
 380                 hammer2_trans_manage_init(pmp);
 381                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 382                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 383                 lockinit(&pmp->lock, "pfslk", 0, 0);
 384                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 385                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 386                 spin_init(&pmp->xop_spin, "h2xop");
 387                 spin_init(&pmp->lru_spin, "h2lru");
 388                 RB_INIT(&pmp->inum_tree);
 389                 TAILQ_INIT(&pmp->sideq);
 390                 TAILQ_INIT(&pmp->lru_list);
 391                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 392
 393                 /*
 394                  * Distribute backend operations to threads
 395                  */
 396                 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
 397                         hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
 398
 399                 /*
 400                  * Save the last media transaction id for the flusher.  Set
 401                  * initial
 402                  */
 403                 if (ripdata)
 404                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 405                 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 406
 407                 /*
 408                  * The synchronization thread may start too early, make
 409                  * sure it stays frozen until we are ready to let it go.
 410                  * XXX
 411                  */
 412                 /*
 413                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 414                                          HAMMER2_THREAD_REMASTER;
 415                 */
 416         }
 417
 418         /*
 419          * Create the PFS's root inode and any missing XOP helper threads.
 420          */
 421         if ((iroot = pmp->iroot) == NULL) {
 422                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 423                 if (ripdata)
 424                         iroot->meta = ripdata->meta;
 425                 pmp->iroot = iroot;
 426                 hammer2_inode_ref(iroot);
 427                 hammer2_inode_unlock(iroot);
 428         }
 429
 430         /*
 431          * Stop here if no chain is passed in.
 432          */
 433         if (chain == NULL)
 434                 goto done;
 435
 436         /*
 437          * When a chain is passed in we must add it to the PFS's root
 438          * inode, update pmp->pfs_types[], and update the syncronization
 439          * threads.
 440          *
 441          * When forcing local mode, mark the PFS as a MASTER regardless.
 442          *
 443          * At the moment empty spots can develop due to removals or failures.
 444          * Ultimately we want to re-fill these spots but doing so might
 445          * confused running code. XXX
 446          */
 447         hammer2_inode_ref(iroot);
 448         hammer2_mtx_ex(&iroot->lock);
 449         j = iroot->cluster.nchains;
 450
 451         kprintf("add PFS to pmp %p[%d]\n", pmp, j);
 452
 453         if (j == HAMMER2_MAXCLUSTER) {
 454                 kprintf("hammer2_mount: cluster full!\n");
 455                 /* XXX fatal error? */
 456         } else {
 457                 KKASSERT(chain->pmp == NULL);
 458                 chain->pmp = pmp;
 459                 hammer2_chain_ref(chain);
 460                 iroot->cluster.array[j].chain = chain;
 461                 if (force_local)
 462                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 463                 else
 464                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 465                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 466                 pmp->pfs_hmps[j] = chain->hmp;
 467
 468                 /*
 469                  * If the PFS is already mounted we must account
 470                  * for the mount_count here.
 471                  */
 472                 if (pmp->mp)
 473                         ++chain->hmp->mount_count;
 474
 475                 /*
 476                  * May have to fixup dirty chain tracking.  Previous
 477                  * pmp was NULL so nothing to undo.
 478                  */
 479                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 480                         hammer2_pfs_memory_inc(pmp);
 481                 ++j;
 482         }
 483         iroot->cluster.nchains = j;
 484
 485         /*
 486          * Update nmasters from any PFS inode which is part of the cluster.
 487          * It is possible that this will result in a value which is too
 488          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 489          * override this value later on.
 490          *
 491          * (This informs us of masters that might not currently be
 492          *  discoverable by this mount).
 493          */
 494         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 495                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 496         }
 497
 498         /*
 499          * Count visible masters.  Masters are usually added with
 500          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 501          * are more (XXX and must update the master inodes).
 502          */
 503         count = 0;
 504         for (i = 0; i < iroot->cluster.nchains; ++i) {
 505                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 506                         ++count;
 507         }
 508         if (pmp->pfs_nmasters < count)
 509                 pmp->pfs_nmasters = count;
 510
 511         /*
 512          * Create missing synchronization and support threads.
 513          *
 514          * Single-node masters (including snapshots) have nothing to
 515          * synchronize and do not require this thread.
 516          *
 517          * Multi-node masters or any number of soft masters, slaves, copy,
 518          * or other PFS types need the thread.
 519          *
 520          * Each thread is responsible for its particular cluster index.
 521          * We use independent threads so stalls or mismatches related to
 522          * any given target do not affect other targets.
 523          */
 524         for (i = 0; i < iroot->cluster.nchains; ++i) {
 525                 /*
 526                  * Single-node masters (including snapshots) have nothing
 527                  * to synchronize and will make direct xops support calls,
 528                  * thus they do not require this thread.
 529                  *
 530                  * Note that there can be thousands of snapshots.  We do not
 531                  * want to create thousands of threads.
 532                  */
 533                 if (pmp->pfs_nmasters <= 1 &&
 534                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 535                         continue;
 536                 }
 537
 538                 /*
 539                  * Sync support thread
 540                  */
 541                 if (pmp->sync_thrs[i].td == NULL) {
 542                         hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
 543                                            "h2nod", i, -1,
 544                                            hammer2_primary_sync_thread);
 545                 }
 546         }
 547
 548         /*
 549          * Create missing Xop threads
 550          *
 551          * NOTE: We create helper threads for all mounted PFSs or any
 552          *       PFSs with 2+ nodes (so the sync thread can update them,
 553          *       even if not mounted).
 554          */
 555         if (pmp->mp || iroot->cluster.nchains >= 2)
 556                 hammer2_xop_helper_create(pmp);
 557
 558         hammer2_mtx_unlock(&iroot->lock);
 559         hammer2_inode_drop(iroot);
 560 done:
 561         return pmp;
 562 }
 563
 564 /*
 565  * Deallocate an element of a probed PFS.  If destroying and this is a
 566  * MASTER, adjust nmasters.
 567  *
 568  * This function does not physically destroy the PFS element in its device
 569  * under the super-root  (see hammer2_ioctl_pfs_delete()).
 570  */
 571 void
 572 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
 573 {
 574         hammer2_inode_t *iroot;
 575         hammer2_chain_t *chain;
 576         int j;
 577
 578         /*
 579          * Cleanup our reference on iroot.  iroot is (should) not be needed
 580          * by the flush code.
 581          */
 582         iroot = pmp->iroot;
 583         if (iroot) {
 584                 /*
 585                  * Stop synchronizing
 586                  *
 587                  * XXX flush after acquiring the iroot lock.
 588                  * XXX clean out the cluster index from all inode structures.
 589                  */
 590                 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
 591
 592                 /*
 593                  * Remove the cluster index from the group.  If destroying
 594                  * the PFS and this is a master, adjust pfs_nmasters.
 595                  */
 596                 hammer2_mtx_ex(&iroot->lock);
 597                 chain = iroot->cluster.array[clindex].chain;
 598                 iroot->cluster.array[clindex].chain = NULL;
 599
 600                 switch(pmp->pfs_types[clindex]) {
 601                 case HAMMER2_PFSTYPE_MASTER:
 602                         if (destroying && pmp->pfs_nmasters > 0)
 603                                 --pmp->pfs_nmasters;
 604                         /* XXX adjust ripdata->meta.pfs_nmasters */
 605                         break;
 606                 default:
 607                         break;
 608                 }
 609                 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
 610
 611                 hammer2_mtx_unlock(&iroot->lock);
 612
 613                 /*
 614                  * Release the chain.
 615                  */
 616                 if (chain) {
 617                         atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 618                         hammer2_chain_drop(chain);
 619                 }
 620
 621                 /*
 622                  * Terminate all XOP threads for the cluster index.
 623                  */
 624                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 625                         hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
 626         }
 627 }
 628
 629 /*
 630  * Destroy a PFS, typically only occurs after the last mount on a device
 631  * has gone away.
 632  */
 633 static void
 634 hammer2_pfsfree(hammer2_pfs_t *pmp)
 635 {
 636         hammer2_inode_t *iroot;
 637         hammer2_chain_t *chain;
 638         int i;
 639         int j;
 640
 641         /*
 642          * Cleanup our reference on iroot.  iroot is (should) not be needed
 643          * by the flush code.
 644          */
 645         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 646
 647         iroot = pmp->iroot;
 648         if (iroot) {
 649                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 650                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 651                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 652                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 653                 }
 654 #if REPORT_REFS_ERRORS
 655                 if (pmp->iroot->refs != 1)
 656                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 657                                 pmp->iroot, pmp->iroot->refs);
 658 #else
 659                 KKASSERT(pmp->iroot->refs == 1);
 660 #endif
 661                 /* ref for pmp->iroot */
 662                 hammer2_inode_drop(pmp->iroot);
 663                 pmp->iroot = NULL;
 664         }
 665
 666         /*
 667          * Cleanup chains remaining on LRU list.
 668          */
 669         kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count);
 670         while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
 671                 hammer2_chain_ref(chain);
 672                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 673                 hammer2_chain_drop(chain);
 674         }
 675
 676         /*
 677          * Free remaining pmp resources
 678          */
 679         kmalloc_destroy(&pmp->mmsg);
 680         kmalloc_destroy(&pmp->minode);
 681
 682         kfree(pmp, M_HAMMER2);
 683 }
 684
 685 /*
 686  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 687  * empty is terminated and freed.
 688  *
 689  * XXX inefficient.
 690  */
 691 static void
 692 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
 693 {
 694         hammer2_pfs_t *pmp;
 695         hammer2_inode_t *iroot;
 696         hammer2_chain_t *rchain;
 697         int didfreeze;
 698         int i;
 699         int j;
 700
 701 again:
 702         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 703                 if ((iroot = pmp->iroot) == NULL)
 704                         continue;
 705                 if (hmp->spmp == pmp) {
 706                         kprintf("unmount hmp %p remove spmp %p\n",
 707                                 hmp, pmp);
 708                         hmp->spmp = NULL;
 709                 }
 710
 711                 /*
 712                  * Determine if this PFS is affected.  If it is we must
 713                  * freeze all management threads and lock its iroot.
 714                  *
 715                  * Freezing a management thread forces it idle, operations
 716                  * in-progress will be aborted and it will have to start
 717                  * over again when unfrozen, or exit if told to exit.
 718                  */
 719                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 720                         if (pmp->pfs_hmps[i] == hmp)
 721                                 break;
 722                 }
 723                 if (i != HAMMER2_MAXCLUSTER) {
 724                         /*
 725                          * Make sure all synchronization threads are locked
 726                          * down.
 727                          */
 728                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 729                                 if (pmp->pfs_hmps[i] == NULL)
 730                                         continue;
 731                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 732                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 733                                         hammer2_thr_freeze_async(
 734                                                 &pmp->xop_groups[j].thrs[i]);
 735                                 }
 736                         }
 737                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 738                                 if (pmp->pfs_hmps[i] == NULL)
 739                                         continue;
 740                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 741                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 742                                         hammer2_thr_freeze(
 743                                                 &pmp->xop_groups[j].thrs[i]);
 744                                 }
 745                         }
 746
 747                         /*
 748                          * Lock the inode and clean out matching chains.
 749                          * Note that we cannot use hammer2_inode_lock_*()
 750                          * here because that would attempt to validate the
 751                          * cluster that we are in the middle of ripping
 752                          * apart.
 753                          *
 754                          * WARNING! We are working directly on the inodes
 755                          *          embedded cluster.
 756                          */
 757                         hammer2_mtx_ex(&iroot->lock);
 758
 759                         /*
 760                          * Remove the chain from matching elements of the PFS.
 761                          */
 762                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 763                                 if (pmp->pfs_hmps[i] != hmp)
 764                                         continue;
 765                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 766                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 767                                         hammer2_thr_delete(
 768                                                 &pmp->xop_groups[j].thrs[i]);
 769                                 }
 770                                 rchain = iroot->cluster.array[i].chain;
 771                                 iroot->cluster.array[i].chain = NULL;
 772                                 pmp->pfs_types[i] = 0;
 773                                 if (pmp->pfs_names[i]) {
 774                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 775                                         pmp->pfs_names[i] = NULL;
 776                                 }
 777                                 if (rchain) {
 778                                         hammer2_chain_drop(rchain);
 779                                         /* focus hint */
 780                                         if (iroot->cluster.focus == rchain)
 781                                                 iroot->cluster.focus = NULL;
 782                                 }
 783                                 pmp->pfs_hmps[i] = NULL;
 784                         }
 785                         hammer2_mtx_unlock(&iroot->lock);
 786                         didfreeze = 1;  /* remaster, unfreeze down below */
 787                 } else {
 788                         didfreeze = 0;
 789                 }
 790
 791                 /*
 792                  * Cleanup trailing chains.  Gaps may remain.
 793                  */
 794                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 795                         if (pmp->pfs_hmps[i])
 796                                 break;
 797                 }
 798                 iroot->cluster.nchains = i + 1;
 799
 800                 /*
 801                  * If the PMP has no elements remaining we can destroy it.
 802                  * (this will transition management threads from frozen->exit).
 803                  */
 804                 if (iroot->cluster.nchains == 0) {
 805                         kprintf("unmount hmp %p last ref to PMP=%p\n",
 806                                 hmp, pmp);
 807                         hammer2_pfsfree(pmp);
 808                         goto again;
 809                 }
 810
 811                 /*
 812                  * If elements still remain we need to set the REMASTER
 813                  * flag and unfreeze it.
 814                  */
 815                 if (didfreeze) {
 816                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 817                                 if (pmp->pfs_hmps[i] == NULL)
 818                                         continue;
 819                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 820                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 821                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 822                                         hammer2_thr_remaster(
 823                                                 &pmp->xop_groups[j].thrs[i]);
 824                                         hammer2_thr_unfreeze(
 825                                                 &pmp->xop_groups[j].thrs[i]);
 826                                 }
 827                         }
 828                 }
 829         }
 830 }
 831
 832 /*
 833  * Mount or remount HAMMER2 fileystem from physical media
 834  *
 835  *      mountroot
 836  *              mp              mount point structure
 837  *              path            NULL
 838  *              data            <unused>
 839  *              cred            <unused>
 840  *
 841  *      mount
 842  *              mp              mount point structure
 843  *              path            path to mount point
 844  *              data            pointer to argument structure in user space
 845  *                      volume  volume path (device@LABEL form)
 846  *                      hflags  user mount flags
 847  *              cred            user credentials
 848  *
 849  * RETURNS:     0       Success
 850  *              !0      error number
 851  */
 852 static
 853 int
 854 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 855                   struct ucred *cred)
 856 {
 857         struct hammer2_mount_info info;
 858         hammer2_pfs_t *pmp;
 859         hammer2_pfs_t *spmp;
 860         hammer2_dev_t *hmp;
 861         hammer2_dev_t *force_local;
 862         hammer2_key_t key_next;
 863         hammer2_key_t key_dummy;
 864         hammer2_key_t lhc;
 865         struct vnode *devvp;
 866         struct nlookupdata nd;
 867         hammer2_chain_t *parent;
 868         hammer2_chain_t *chain;
 869         hammer2_cluster_t *cluster;
 870         const hammer2_inode_data_t *ripdata;
 871         hammer2_blockref_t bref;
 872         struct file *fp;
 873         char devstr[MNAMELEN];
 874         size_t size;
 875         size_t done;
 876         char *dev;
 877         char *label;
 878         int ronly = 1;
 879         int error;
 880         int i;
 881
 882         hmp = NULL;
 883         pmp = NULL;
 884         dev = NULL;
 885         label = NULL;
 886         devvp = NULL;
 887
 888         kprintf("hammer2_mount\n");
 889
 890         if (path == NULL) {
 891                 /*
 892                  * Root mount
 893                  */
 894                 bzero(&info, sizeof(info));
 895                 info.cluster_fd = -1;
 896                 ksnprintf(devstr, sizeof(devstr), "%s",
 897                           mp->mnt_stat.f_mntfromname);
 898                 kprintf("hammer2_mount: root '%s'\n", devstr);
 899         } else {
 900                 /*
 901                  * Non-root mount or updating a mount
 902                  */
 903                 error = copyin(data, &info, sizeof(info));
 904                 if (error)
 905                         return (error);
 906
 907                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 908                 if (error)
 909                         return (error);
 910         }
 911
 912         /*
 913          * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
 914          * if no label specified, based on the partition id.  Error out if no
 915          * partition id.  This is strictly a convenience to match the
 916          * default label created by newfs_hammer2, our preference is
 917          * that a label always be specified.
 918          */
 919         dev = devstr;
 920         label = strchr(devstr, '@');
 921         if (label && ((label + 1) - dev) > done)
 922                 return (EINVAL);
 923         if (label && label == devstr)
 924                 return (EINVAL);
 925         if (label == NULL || label[1] == 0) {
 926                 char slice;
 927
 928                 if (label == NULL)
 929                         label = devstr + strlen(devstr);
 930                 slice = label[-1];
 931                 switch(slice) {
 932                 case 'a':
 933                         label = "BOOT";
 934                         break;
 935                 case 'd':
 936                         label = "ROOT";
 937                         break;
 938                 default:
 939                         label = "DATA";
 940                         break;
 941                 }
 942         } else {
 943                 *label = '\0';
 944                 label++;
 945         }
 946
 947         kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
 948                 dev, label, (mp->mnt_flag & MNT_RDONLY));
 949
 950         if (mp->mnt_flag & MNT_UPDATE) {
 951                 /*
 952                  * Update mount.  Note that pmp->iroot->cluster is
 953                  * an inode-embedded cluster and thus cannot be
 954                  * directly locked.
 955                  *
 956                  * XXX HAMMER2 needs to implement NFS export via
 957                  *     mountctl.
 958                  */
 959                 pmp = MPTOPMP(mp);
 960                 pmp->hflags = info.hflags;
 961                 cluster = &pmp->iroot->cluster;
 962                 for (i = 0; i < cluster->nchains; ++i) {
 963                         if (cluster->array[i].chain == NULL)
 964                                 continue;
 965                         hmp = cluster->array[i].chain->hmp;
 966                         devvp = hmp->devvp;
 967                         error = hammer2_remount(hmp, mp, path,
 968                                                 devvp, cred);
 969                         if (error)
 970                                 break;
 971                 }
 972
 973                 return error;
 974         }
 975
 976         /*
 977          * HMP device mount
 978          *
 979          * If a path is specified and dev is not an empty string, lookup the
 980          * name and verify that it referes to a block device.
 981          *
 982          * If a path is specified and dev is an empty string we fall through
 983          * and locate the label in the hmp search.
 984          */
 985         if (path && *dev != 0) {
 986                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 987                 if (error == 0)
 988                         error = nlookup(&nd);
 989                 if (error == 0)
 990                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 991                 nlookup_done(&nd);
 992         } else if (path == NULL) {
 993                 /* root mount */
 994                 cdev_t cdev = kgetdiskbyname(dev);
 995                 error = bdevvp(cdev, &devvp);
 996                 if (error)
 997                         kprintf("hammer2: cannot find '%s'\n", dev);
 998         } else {
 999                 /*
1000                  * We will locate the hmp using the label in the hmp loop.
1001                  */
1002                 error = 0;
1003         }
1004
1005         /*
1006          * Make sure its a block device.  Do not check to see if it is
1007          * already mounted until we determine that its a fresh H2 device.
1008          */
1009         if (error == 0 && devvp) {
1010                 vn_isdisk(devvp, &error);
1011         }
1012
1013         /*
1014          * Determine if the device has already been mounted.  After this
1015          * check hmp will be non-NULL if we are doing the second or more
1016          * hammer2 mounts from the same device.
1017          */
1018         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1019         if (devvp) {
1020                 /*
1021                  * Match the device.  Due to the way devfs works,
1022                  * we may not be able to directly match the vnode pointer,
1023                  * so also check to see if the underlying device matches.
1024                  */
1025                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1026                         if (hmp->devvp == devvp)
1027                                 break;
1028                         if (devvp->v_rdev &&
1029                             hmp->devvp->v_rdev == devvp->v_rdev) {
1030                                 break;
1031                         }
1032                 }
1033
1034                 /*
1035                  * If no match this may be a fresh H2 mount, make sure
1036                  * the device is not mounted on anything else.
1037                  */
1038                 if (hmp == NULL)
1039                         error = vfs_mountedon(devvp);
1040         } else if (error == 0) {
1041                 /*
1042                  * Match the label to a pmp already probed.
1043                  */
1044                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1045                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1046                                 if (pmp->pfs_names[i] &&
1047                                     strcmp(pmp->pfs_names[i], label) == 0) {
1048                                         hmp = pmp->pfs_hmps[i];
1049                                         break;
1050                                 }
1051                         }
1052                         if (hmp)
1053                                 break;
1054                 }
1055                 if (hmp == NULL)
1056                         error = ENOENT;
1057         }
1058
1059         /*
1060          * Open the device if this isn't a secondary mount and construct
1061          * the H2 device mount (hmp).
1062          */
1063         if (hmp == NULL) {
1064                 hammer2_chain_t *schain;
1065                 hammer2_xid_t xid;
1066
1067                 if (error == 0 && vcount(devvp) > 0) {
1068                         kprintf("Primary device already has references\n");
1069                         error = EBUSY;
1070                 }
1071
1072                 /*
1073                  * Now open the device
1074                  */
1075                 if (error == 0) {
1076                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1077                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1078                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
1079                         if (error == 0) {
1080                                 error = VOP_OPEN(devvp,
1081                                              (ronly ? FREAD : FREAD | FWRITE),
1082                                              FSCRED, NULL);
1083                         }
1084                         vn_unlock(devvp);
1085                 }
1086                 if (error && devvp) {
1087                         vrele(devvp);
1088                         devvp = NULL;
1089                 }
1090                 if (error) {
1091                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1092                         return error;
1093                 }
1094                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1095                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1096                 hmp->ronly = ronly;
1097                 hmp->devvp = devvp;
1098                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1099                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1100                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1101                 RB_INIT(&hmp->iotree);
1102                 spin_init(&hmp->io_spin, "hm2mount_io");
1103                 spin_init(&hmp->list_spin, "hm2mount_list");
1104                 TAILQ_INIT(&hmp->flushq);
1105
1106                 lockinit(&hmp->vollk, "h2vol", 0, 0);
1107                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1108                 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1109
1110                 /*
1111                  * vchain setup. vchain.data is embedded.
1112                  * vchain.refs is initialized and will never drop to 0.
1113                  *
1114                  * NOTE! voldata is not yet loaded.
1115                  */
1116                 hmp->vchain.hmp = hmp;
1117                 hmp->vchain.refs = 1;
1118                 hmp->vchain.data = (void *)&hmp->voldata;
1119                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1120                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1121                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1122
1123                 hammer2_chain_core_init(&hmp->vchain);
1124                 /* hmp->vchain.u.xxx is left NULL */
1125
1126                 /*
1127                  * fchain setup.  fchain.data is embedded.
1128                  * fchain.refs is initialized and will never drop to 0.
1129                  *
1130                  * The data is not used but needs to be initialized to
1131                  * pass assertion muster.  We use this chain primarily
1132                  * as a placeholder for the freemap's top-level RBTREE
1133                  * so it does not interfere with the volume's topology
1134                  * RBTREE.
1135                  */
1136                 hmp->fchain.hmp = hmp;
1137                 hmp->fchain.refs = 1;
1138                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1139                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1140                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1141                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1142                 hmp->fchain.bref.methods =
1143                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1144                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1145
1146                 hammer2_chain_core_init(&hmp->fchain);
1147                 /* hmp->fchain.u.xxx is left NULL */
1148
1149                 /*
1150                  * Install the volume header and initialize fields from
1151                  * voldata.
1152                  */
1153                 error = hammer2_install_volume_header(hmp);
1154                 if (error) {
1155                         hammer2_unmount_helper(mp, NULL, hmp);
1156                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1157                         hammer2_vfs_unmount(mp, MNT_FORCE);
1158                         return error;
1159                 }
1160
1161                 /*
1162                  * Really important to get these right or flush will get
1163                  * confused.
1164                  */
1165                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1166                 kprintf("alloc spmp %p tid %016jx\n",
1167                         hmp->spmp, hmp->voldata.mirror_tid);
1168                 spmp = hmp->spmp;
1169
1170                 /*
1171                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
1172                  * is inherited from the volume header.
1173                  */
1174                 xid = 0;
1175                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1176                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1177                 hmp->vchain.pmp = spmp;
1178                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1179                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1180                 hmp->fchain.pmp = spmp;
1181
1182                 /*
1183                  * First locate the super-root inode, which is key 0
1184                  * relative to the volume header's blockset.
1185                  *
1186                  * Then locate the root inode by scanning the directory keyspace
1187                  * represented by the label.
1188                  */
1189                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1190                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1191                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1192                                       0);
1193                 hammer2_chain_lookup_done(parent);
1194                 if (schain == NULL) {
1195                         kprintf("hammer2_mount: invalid super-root\n");
1196                         hammer2_unmount_helper(mp, NULL, hmp);
1197                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1198                         hammer2_vfs_unmount(mp, MNT_FORCE);
1199                         return EINVAL;
1200                 }
1201                 if (schain->error) {
1202                         kprintf("hammer2_mount: error %s reading super-root\n",
1203                                 hammer2_error_str(schain->error));
1204                         hammer2_chain_unlock(schain);
1205                         hammer2_chain_drop(schain);
1206                         schain = NULL;
1207                         hammer2_unmount_helper(mp, NULL, hmp);
1208                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1209                         hammer2_vfs_unmount(mp, MNT_FORCE);
1210                         return EINVAL;
1211                 }
1212
1213                 /*
1214                  * The super-root always uses an inode_tid of 1 when
1215                  * creating PFSs.
1216                  */
1217                 spmp->inode_tid = 1;
1218                 spmp->modify_tid = schain->bref.modify_tid + 1;
1219
1220                 /*
1221                  * Sanity-check schain's pmp and finish initialization.
1222                  * Any chain belonging to the super-root topology should
1223                  * have a NULL pmp (not even set to spmp).
1224                  */
1225                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1226                 KKASSERT(schain->pmp == NULL);
1227                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1228
1229                 /*
1230                  * Replace the dummy spmp->iroot with a real one.  It's
1231                  * easier to just do a wholesale replacement than to try
1232                  * to update the chain and fixup the iroot fields.
1233                  *
1234                  * The returned inode is locked with the supplied cluster.
1235                  */
1236                 cluster = hammer2_cluster_from_chain(schain);
1237                 hammer2_inode_drop(spmp->iroot);
1238                 spmp->iroot = NULL;
1239                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1240                 spmp->spmp_hmp = hmp;
1241                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1242                 spmp->pfs_hmps[0] = hmp;
1243                 hammer2_inode_ref(spmp->iroot);
1244                 hammer2_inode_unlock(spmp->iroot);
1245                 hammer2_cluster_unlock(cluster);
1246                 hammer2_cluster_drop(cluster);
1247                 schain = NULL;
1248                 /* leave spmp->iroot with one ref */
1249
1250                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1251                         error = hammer2_recovery(hmp);
1252                         /* XXX do something with error */
1253                 }
1254                 hammer2_update_pmps(hmp);
1255                 hammer2_iocom_init(hmp);
1256                 hammer2_bulkfree_init(hmp);
1257
1258                 /*
1259                  * Ref the cluster management messaging descriptor.  The mount
1260                  * program deals with the other end of the communications pipe.
1261                  *
1262                  * Root mounts typically do not supply one.
1263                  */
1264                 if (info.cluster_fd >= 0) {
1265                         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1266                         if (fp) {
1267                                 hammer2_cluster_reconnect(hmp, fp);
1268                         } else {
1269                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1270                         }
1271                 }
1272         } else {
1273                 spmp = hmp->spmp;
1274                 if (info.hflags & HMNT2_DEVFLAGS) {
1275                         kprintf("hammer2: Warning: mount flags pertaining "
1276                                 "to the whole device may only be specified "
1277                                 "on the first mount of the device: %08x\n",
1278                                 info.hflags & HMNT2_DEVFLAGS);
1279                 }
1280         }
1281
1282         /*
1283          * Force local mount (disassociate all PFSs from their clusters).
1284          * Used primarily for debugging.
1285          */
1286         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1287
1288         /*
1289          * Lookup the mount point under the media-localized super-root.
1290          * Scanning hammer2_pfslist doesn't help us because it represents
1291          * PFS cluster ids which can aggregate several named PFSs together.
1292          *
1293          * cluster->pmp will incorrectly point to spmp and must be fixed
1294          * up later on.
1295          */
1296         hammer2_inode_lock(spmp->iroot, 0);
1297         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1298         lhc = hammer2_dirhash(label, strlen(label));
1299         chain = hammer2_chain_lookup(&parent, &key_next,
1300                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1301                                      0);
1302         while (chain) {
1303                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1304                     strcmp(label, chain->data->ipdata.filename) == 0) {
1305                         break;
1306                 }
1307                 chain = hammer2_chain_next(&parent, chain, &key_next,
1308                                             key_next,
1309                                             lhc + HAMMER2_DIRHASH_LOMASK,
1310                                             0);
1311         }
1312         if (parent) {
1313                 hammer2_chain_unlock(parent);
1314                 hammer2_chain_drop(parent);
1315         }
1316         hammer2_inode_unlock(spmp->iroot);
1317
1318         /*
1319          * PFS could not be found?
1320          */
1321         if (chain == NULL) {
1322                 kprintf("hammer2_mount: PFS label not found\n");
1323                 hammer2_unmount_helper(mp, NULL, hmp);
1324                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1325                 hammer2_vfs_unmount(mp, MNT_FORCE);
1326
1327                 return EINVAL;
1328         }
1329
1330         /*
1331          * Acquire the pmp structure (it should have already been allocated
1332          * via hammer2_update_pmps() so do not pass cluster in to add to
1333          * available chains).
1334          *
1335          * Check if the cluster has already been mounted.  A cluster can
1336          * only be mounted once, use null mounts to mount additional copies.
1337          */
1338         ripdata = &chain->data->ipdata;
1339         bref = chain->bref;
1340         pmp = hammer2_pfsalloc(NULL, ripdata,
1341                                bref.modify_tid, force_local);
1342         hammer2_chain_unlock(chain);
1343         hammer2_chain_drop(chain);
1344
1345         /*
1346          * Finish the mount
1347          */
1348         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1349
1350         if (pmp->mp) {
1351                 kprintf("hammer2_mount: PFS already mounted!\n");
1352                 hammer2_unmount_helper(mp, NULL, hmp);
1353                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1354                 hammer2_vfs_unmount(mp, MNT_FORCE);
1355
1356                 return EBUSY;
1357         }
1358
1359         pmp->hflags = info.hflags;
1360         mp->mnt_flag |= MNT_LOCAL;
1361         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1362         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1363
1364         /*
1365          * required mount structure initializations
1366          */
1367         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1368         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1369
1370         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1371         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1372
1373         /*
1374          * Optional fields
1375          */
1376         mp->mnt_iosize_max = MAXPHYS;
1377
1378         /*
1379          * Connect up mount pointers.
1380          */
1381         hammer2_mount_helper(mp, pmp);
1382
1383         lockmgr(&hammer2_mntlk, LK_RELEASE);
1384
1385         /*
1386          * Finish setup
1387          */
1388         vfs_getnewfsid(mp);
1389         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1390         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1391         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1392
1393         if (path) {
1394                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1395                           MNAMELEN - 1, &size);
1396                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1397         } /* else root mount, already in there */
1398
1399         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1400         if (path) {
1401                 copyinstr(path, mp->mnt_stat.f_mntonname,
1402                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1403                           &size);
1404         } else {
1405                 /* root mount */
1406                 mp->mnt_stat.f_mntonname[0] = '/';
1407         }
1408
1409         /*
1410          * Initial statfs to prime mnt_stat.
1411          */
1412         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1413
1414         return 0;
1415 }
1416
1417 /*
1418  * Scan PFSs under the super-root and create hammer2_pfs structures.
1419  */
1420 static
1421 void
1422 hammer2_update_pmps(hammer2_dev_t *hmp)
1423 {
1424         const hammer2_inode_data_t *ripdata;
1425         hammer2_chain_t *parent;
1426         hammer2_chain_t *chain;
1427         hammer2_blockref_t bref;
1428         hammer2_dev_t *force_local;
1429         hammer2_pfs_t *spmp;
1430         hammer2_pfs_t *pmp;
1431         hammer2_key_t key_next;
1432
1433         /*
1434          * Force local mount (disassociate all PFSs from their clusters).
1435          * Used primarily for debugging.
1436          */
1437         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1438
1439         /*
1440          * Lookup mount point under the media-localized super-root.
1441          *
1442          * cluster->pmp will incorrectly point to spmp and must be fixed
1443          * up later on.
1444          */
1445         spmp = hmp->spmp;
1446         hammer2_inode_lock(spmp->iroot, 0);
1447         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1448         chain = hammer2_chain_lookup(&parent, &key_next,
1449                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1450                                          0);
1451         while (chain) {
1452                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1453                         continue;
1454                 ripdata = &chain->data->ipdata;
1455                 bref = chain->bref;
1456                 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1457
1458                 pmp = hammer2_pfsalloc(chain, ripdata,
1459                                        bref.modify_tid, force_local);
1460                 chain = hammer2_chain_next(&parent, chain, &key_next,
1461                                            key_next, HAMMER2_KEY_MAX,
1462                                            0);
1463         }
1464         if (parent) {
1465                 hammer2_chain_unlock(parent);
1466                 hammer2_chain_drop(parent);
1467         }
1468         hammer2_inode_unlock(spmp->iroot);
1469 }
1470
1471 static
1472 int
1473 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1474                 struct vnode *devvp, struct ucred *cred)
1475 {
1476         int error;
1477
1478         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1479                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1480                 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1481                 vn_unlock(devvp);
1482                 error = hammer2_recovery(hmp);
1483                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1484                 if (error == 0) {
1485                         VOP_CLOSE(devvp, FREAD, NULL);
1486                         hmp->ronly = 0;
1487                 } else {
1488                         VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1489                 }
1490                 vn_unlock(devvp);
1491         } else {
1492                 error = 0;
1493         }
1494         return error;
1495 }
1496
1497 static
1498 int
1499 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1500 {
1501         hammer2_pfs_t *pmp;
1502         int flags;
1503         int error = 0;
1504
1505         pmp = MPTOPMP(mp);
1506
1507         if (pmp == NULL)
1508                 return(0);
1509
1510         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1511
1512         /*
1513          * If mount initialization proceeded far enough we must flush
1514          * its vnodes and sync the underlying mount points.  Three syncs
1515          * are required to fully flush the filesystem (freemap updates lag
1516          * by one flush, and one extra for safety).
1517          */
1518         if (mntflags & MNT_FORCE)
1519                 flags = FORCECLOSE;
1520         else
1521                 flags = 0;
1522         if (pmp->iroot) {
1523                 error = vflush(mp, 0, flags);
1524                 if (error)
1525                         goto failed;
1526                 hammer2_vfs_sync(mp, MNT_WAIT);
1527                 hammer2_vfs_sync(mp, MNT_WAIT);
1528                 hammer2_vfs_sync(mp, MNT_WAIT);
1529         }
1530
1531         /*
1532          * Cleanup the frontend support XOPS threads
1533          */
1534         hammer2_xop_helper_cleanup(pmp);
1535
1536         if (pmp->mp)
1537                 hammer2_unmount_helper(mp, pmp, NULL);
1538
1539         error = 0;
1540 failed:
1541         lockmgr(&hammer2_mntlk, LK_RELEASE);
1542
1543         return (error);
1544 }
1545
1546 /*
1547  * Mount helper, hook the system mount into our PFS.
1548  * The mount lock is held.
1549  *
1550  * We must bump the mount_count on related devices for any
1551  * mounted PFSs.
1552  */
1553 static
1554 void
1555 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1556 {
1557         hammer2_cluster_t *cluster;
1558         hammer2_chain_t *rchain;
1559         int i;
1560
1561         mp->mnt_data = (qaddr_t)pmp;
1562         pmp->mp = mp;
1563
1564         /*
1565          * After pmp->mp is set we have to adjust hmp->mount_count.
1566          */
1567         cluster = &pmp->iroot->cluster;
1568         for (i = 0; i < cluster->nchains; ++i) {
1569                 rchain = cluster->array[i].chain;
1570                 if (rchain == NULL)
1571                         continue;
1572                 ++rchain->hmp->mount_count;
1573                 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1574                         rchain->hmp, rchain->hmp->mount_count);
1575         }
1576
1577         /*
1578          * Create missing Xop threads
1579          */
1580         hammer2_xop_helper_create(pmp);
1581 }
1582
1583 /*
1584  * Mount helper, unhook the system mount from our PFS.
1585  * The mount lock is held.
1586  *
1587  * If hmp is supplied a mount responsible for being the first to open
1588  * the block device failed and the block device and all PFSs using the
1589  * block device must be cleaned up.
1590  *
1591  * If pmp is supplied multiple devices might be backing the PFS and each
1592  * must be disconnected.  This might not be the last PFS using some of the
1593  * underlying devices.  Also, we have to adjust our hmp->mount_count
1594  * accounting for the devices backing the pmp which is now undergoing an
1595  * unmount.
1596  */
1597 static
1598 void
1599 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1600 {
1601         hammer2_cluster_t *cluster;
1602         hammer2_chain_t *rchain;
1603         struct vnode *devvp;
1604         int dumpcnt;
1605         int ronly;
1606         int i;
1607
1608         /*
1609          * If no device supplied this is a high-level unmount and we have to
1610          * to disconnect the mount, adjust mount_count, and locate devices
1611          * that might now have no mounts.
1612          */
1613         if (pmp) {
1614                 KKASSERT(hmp == NULL);
1615                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1616                 pmp->mp = NULL;
1617                 mp->mnt_data = NULL;
1618
1619                 /*
1620                  * After pmp->mp is cleared we have to account for
1621                  * mount_count.
1622                  */
1623                 cluster = &pmp->iroot->cluster;
1624                 for (i = 0; i < cluster->nchains; ++i) {
1625                         rchain = cluster->array[i].chain;
1626                         if (rchain == NULL)
1627                                 continue;
1628                         --rchain->hmp->mount_count;
1629                         kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1630                                 rchain->hmp, rchain->hmp->mount_count);
1631                         /* scrapping hmp now may invalidate the pmp */
1632                 }
1633 again:
1634                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1635                         if (hmp->mount_count == 0) {
1636                                 hammer2_unmount_helper(NULL, NULL, hmp);
1637                                 goto again;
1638                         }
1639                 }
1640                 return;
1641         }
1642
1643         /*
1644          * Try to terminate the block device.  We can't terminate it if
1645          * there are still PFSs referencing it.
1646          */
1647         kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1648                 hmp, hmp->mount_count);
1649         if (hmp->mount_count)
1650                 return;
1651
1652         hammer2_bulkfree_uninit(hmp);
1653         hammer2_pfsfree_scan(hmp);
1654         hammer2_dev_exlock(hmp);        /* XXX order */
1655
1656         /*
1657          * Cycle the volume data lock as a safety (probably not needed any
1658          * more).  To ensure everything is out we need to flush at least
1659          * three times.  (1) The running of the sideq can dirty the
1660          * filesystem, (2) A normal flush can dirty the freemap, and
1661          * (3) ensure that the freemap is fully synchronized.
1662          *
1663          * The next mount's recovery scan can clean everything up but we want
1664          * to leave the filesystem in a 100% clean state on a normal unmount.
1665          */
1666 #if 0
1667         hammer2_voldata_lock(hmp);
1668         hammer2_voldata_unlock(hmp);
1669 #endif
1670         hammer2_iocom_uninit(hmp);
1671
1672         if ((hmp->vchain.flags | hmp->fchain.flags) &
1673             HAMMER2_CHAIN_FLUSH_MASK) {
1674                 kprintf("hammer2_unmount: chains left over "
1675                         "after final sync\n");
1676                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1677                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1678
1679                 if (hammer2_debug & 0x0010)
1680                         Debugger("entered debugger");
1681         }
1682
1683         KKASSERT(hmp->spmp == NULL);
1684
1685         /*
1686          * Finish up with the device vnode
1687          */
1688         if ((devvp = hmp->devvp) != NULL) {
1689                 ronly = hmp->ronly;
1690                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1691                 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1692                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1693                         ronly);
1694                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1695                 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1696                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1697                 hmp->devvp = NULL;
1698                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1699                 vn_unlock(devvp);
1700                 vrele(devvp);
1701                 devvp = NULL;
1702         }
1703
1704         /*
1705          * Clear vchain/fchain flags that might prevent final cleanup
1706          * of these chains.
1707          */
1708         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1709                 atomic_add_long(&hammer2_count_modified_chains, -1);
1710                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1711                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1712         }
1713         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1714                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1715         }
1716
1717         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1718                 atomic_add_long(&hammer2_count_modified_chains, -1);
1719                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1720                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1721         }
1722         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1723                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1724         }
1725
1726         /*
1727          * Final drop of embedded freemap root chain to
1728          * clean up fchain.core (fchain structure is not
1729          * flagged ALLOCATED so it is cleaned out and then
1730          * left to rot).
1731          */
1732         hammer2_chain_drop(&hmp->fchain);
1733
1734         /*
1735          * Final drop of embedded volume root chain to clean
1736          * up vchain.core (vchain structure is not flagged
1737          * ALLOCATED so it is cleaned out and then left to
1738          * rot).
1739          */
1740         dumpcnt = 50;
1741         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1742         dumpcnt = 50;
1743         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1744         hammer2_dev_unlock(hmp);
1745         hammer2_chain_drop(&hmp->vchain);
1746
1747         hammer2_io_cleanup(hmp, &hmp->iotree);
1748         if (hmp->iofree_count) {
1749                 kprintf("io_cleanup: %d I/O's left hanging\n",
1750                         hmp->iofree_count);
1751         }
1752
1753         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1754         kmalloc_destroy(&hmp->mchain);
1755         kfree(hmp, M_HAMMER2);
1756 }
1757
1758 int
1759 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1760                  ino_t ino, struct vnode **vpp)
1761 {
1762         hammer2_xop_lookup_t *xop;
1763         hammer2_pfs_t *pmp;
1764         hammer2_inode_t *ip;
1765         hammer2_tid_t inum;
1766         int error;
1767
1768         inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1769
1770         error = 0;
1771         pmp = MPTOPMP(mp);
1772
1773         /*
1774          * Easy if we already have it cached
1775          */
1776         ip = hammer2_inode_lookup(pmp, inum);
1777         if (ip) {
1778                 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1779                 *vpp = hammer2_igetv(ip, &error);
1780                 hammer2_inode_unlock(ip);
1781                 hammer2_inode_drop(ip);         /* from lookup */
1782
1783                 return error;
1784         }
1785
1786         /*
1787          * Otherwise we have to find the inode
1788          */
1789         xop = hammer2_xop_alloc(pmp->iroot, 0);
1790         xop->lhc = inum;
1791         hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1792         error = hammer2_xop_collect(&xop->head, 0);
1793
1794         if (error == 0) {
1795                 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1796                         kprintf("vget: no collect error but also no rdata\n");
1797                         kprintf("xop %p\n", xop);
1798                         while ((hammer2_debug & 0x80000) == 0) {
1799                                 tsleep(xop, PCATCH, "wait", hz * 10);
1800                         }
1801                         ip = NULL;
1802                 } else {
1803                         ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1804                 }
1805         }
1806         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1807
1808         if (ip) {
1809                 *vpp = hammer2_igetv(ip, &error);
1810                 hammer2_inode_unlock(ip);
1811         } else {
1812                 *vpp = NULL;
1813                 error = ENOENT;
1814         }
1815         return (error);
1816 }
1817
1818 static
1819 int
1820 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1821 {
1822         hammer2_pfs_t *pmp;
1823         struct vnode *vp;
1824         int error;
1825
1826         pmp = MPTOPMP(mp);
1827         if (pmp->iroot == NULL) {
1828                 *vpp = NULL;
1829                 return EINVAL;
1830         }
1831
1832         error = 0;
1833         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1834
1835         while (pmp->inode_tid == 0) {
1836                 hammer2_xop_ipcluster_t *xop;
1837                 hammer2_inode_meta_t *meta;
1838
1839                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1840                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1841                 error = hammer2_xop_collect(&xop->head, 0);
1842
1843                 if (error == 0) {
1844                         meta = &xop->head.cluster.focus->data->ipdata.meta;
1845                         pmp->iroot->meta = *meta;
1846                         pmp->inode_tid = meta->pfs_inum + 1;
1847                         if (pmp->inode_tid < HAMMER2_INODE_START)
1848                                 pmp->inode_tid = HAMMER2_INODE_START;
1849                         pmp->modify_tid =
1850                                 xop->head.cluster.focus->bref.modify_tid + 1;
1851                         kprintf("PFS: Starting inode %jd\n",
1852                                 (intmax_t)pmp->inode_tid);
1853                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1854                                 pmp->inode_tid, pmp->modify_tid);
1855                         wakeup(&pmp->iroot);
1856
1857                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1858
1859                         /*
1860                          * Prime the mount info.
1861                          */
1862                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1863                         break;
1864                 }
1865
1866                 /*
1867                  * Loop, try again
1868                  */
1869                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1870                 hammer2_inode_unlock(pmp->iroot);
1871                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1872                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1873                 if (error == EINTR)
1874                         break;
1875         }
1876
1877         if (error) {
1878                 hammer2_inode_unlock(pmp->iroot);
1879                 *vpp = NULL;
1880         } else {
1881                 vp = hammer2_igetv(pmp->iroot, &error);
1882                 hammer2_inode_unlock(pmp->iroot);
1883                 *vpp = vp;
1884         }
1885
1886         return (error);
1887 }
1888
1889 /*
1890  * Filesystem status
1891  *
1892  * XXX incorporate ipdata->meta.inode_quota and data_quota
1893  */
1894 static
1895 int
1896 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1897 {
1898         hammer2_pfs_t *pmp;
1899         hammer2_dev_t *hmp;
1900         hammer2_blockref_t bref;
1901         int i;
1902
1903         /*
1904          * NOTE: iroot might not have validated the cluster yet.
1905          */
1906         pmp = MPTOPMP(mp);
1907
1908         mp->mnt_stat.f_files = 0;
1909         mp->mnt_stat.f_ffree = 0;
1910         mp->mnt_stat.f_blocks = 0;
1911         mp->mnt_stat.f_bfree = 0;
1912         mp->mnt_stat.f_bavail = 0;
1913
1914         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1915                 hmp = pmp->pfs_hmps[i];
1916                 if (hmp == NULL)
1917                         continue;
1918                 if (pmp->iroot->cluster.array[i].chain)
1919                         bref = pmp->iroot->cluster.array[i].chain->bref;
1920                 else
1921                         bzero(&bref, sizeof(bref));
1922
1923                 mp->mnt_stat.f_files = bref.embed.stats.inode_count;
1924                 mp->mnt_stat.f_ffree = 0;
1925                 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size /
1926                                         mp->mnt_vstat.f_bsize;
1927                 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free /
1928                                         mp->mnt_vstat.f_bsize;
1929                 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1930
1931                 *sbp = mp->mnt_stat;
1932         }
1933         return (0);
1934 }
1935
1936 static
1937 int
1938 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1939 {
1940         hammer2_pfs_t *pmp;
1941         hammer2_dev_t *hmp;
1942         hammer2_blockref_t bref;
1943         int i;
1944
1945         /*
1946          * NOTE: iroot might not have validated the cluster yet.
1947          */
1948         pmp = MPTOPMP(mp);
1949
1950         mp->mnt_vstat.f_bsize = 0;
1951         mp->mnt_vstat.f_files = 0;
1952         mp->mnt_vstat.f_ffree = 0;
1953         mp->mnt_vstat.f_blocks = 0;
1954         mp->mnt_vstat.f_bfree = 0;
1955         mp->mnt_vstat.f_bavail = 0;
1956
1957         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1958                 hmp = pmp->pfs_hmps[i];
1959                 if (hmp == NULL)
1960                         continue;
1961                 if (pmp->iroot->cluster.array[i].chain)
1962                         bref = pmp->iroot->cluster.array[i].chain->bref;
1963                 else
1964                         bzero(&bref, sizeof(bref));
1965
1966                 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1967                 mp->mnt_vstat.f_files = bref.embed.stats.inode_count;
1968                 mp->mnt_vstat.f_ffree = 0;
1969                 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size /
1970                                         mp->mnt_vstat.f_bsize;
1971                 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1972                                         mp->mnt_vstat.f_bsize;
1973                 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1974
1975                 *sbp = mp->mnt_vstat;
1976         }
1977         return (0);
1978 }
1979
1980 /*
1981  * Mount-time recovery (RW mounts)
1982  *
1983  * Updates to the free block table are allowed to lag flushes by one
1984  * transaction.  In case of a crash, then on a fresh mount we must do an
1985  * incremental scan of the last committed transaction id and make sure that
1986  * all related blocks have been marked allocated.
1987  *
1988  * The super-root topology and each PFS has its own transaction id domain,
1989  * so we must track PFS boundary transitions.
1990  */
1991 struct hammer2_recovery_elm {
1992         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1993         hammer2_chain_t *chain;
1994         hammer2_tid_t sync_tid;
1995 };
1996
1997 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1998
1999 struct hammer2_recovery_info {
2000         struct hammer2_recovery_list list;
2001         hammer2_tid_t   mtid;
2002         int     depth;
2003 };
2004
2005 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2006                         hammer2_chain_t *parent,
2007                         struct hammer2_recovery_info *info,
2008                         hammer2_tid_t sync_tid);
2009
2010 #define HAMMER2_RECOVERY_MAXDEPTH       10
2011
2012 static
2013 int
2014 hammer2_recovery(hammer2_dev_t *hmp)
2015 {
2016         struct hammer2_recovery_info info;
2017         struct hammer2_recovery_elm *elm;
2018         hammer2_chain_t *parent;
2019         hammer2_tid_t sync_tid;
2020         hammer2_tid_t mirror_tid;
2021         int error;
2022
2023         hammer2_trans_init(hmp->spmp, 0);
2024
2025         sync_tid = hmp->voldata.freemap_tid;
2026         mirror_tid = hmp->voldata.mirror_tid;
2027
2028         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2029         if (sync_tid >= mirror_tid) {
2030                 kprintf(" no recovery needed\n");
2031         } else {
2032                 kprintf(" freemap recovery %016jx-%016jx\n",
2033                         sync_tid + 1, mirror_tid);
2034         }
2035
2036         TAILQ_INIT(&info.list);
2037         info.depth = 0;
2038         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2039         error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2040         hammer2_chain_lookup_done(parent);
2041
2042         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2043                 TAILQ_REMOVE(&info.list, elm, entry);
2044                 parent = elm->chain;
2045                 sync_tid = elm->sync_tid;
2046                 kfree(elm, M_HAMMER2);
2047
2048                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2049                 error |= hammer2_recovery_scan(hmp, parent, &info,
2050                                               hmp->voldata.freemap_tid);
2051                 hammer2_chain_unlock(parent);
2052                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
2053         }
2054         hammer2_trans_done(hmp->spmp);
2055
2056         return error;
2057 }
2058
2059 static
2060 int
2061 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2062                       struct hammer2_recovery_info *info,
2063                       hammer2_tid_t sync_tid)
2064 {
2065         const hammer2_inode_data_t *ripdata;
2066         hammer2_chain_t *chain;
2067         hammer2_blockref_t bref;
2068         int tmp_error;
2069         int rup_error;
2070         int error;
2071         int first;
2072
2073         /*
2074          * Adjust freemap to ensure that the block(s) are marked allocated.
2075          */
2076         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2077                 hammer2_freemap_adjust(hmp, &parent->bref,
2078                                        HAMMER2_FREEMAP_DORECOVER);
2079         }
2080
2081         /*
2082          * Check type for recursive scan
2083          */
2084         switch(parent->bref.type) {
2085         case HAMMER2_BREF_TYPE_VOLUME:
2086                 /* data already instantiated */
2087                 break;
2088         case HAMMER2_BREF_TYPE_INODE:
2089                 /*
2090                  * Must instantiate data for DIRECTDATA test and also
2091                  * for recursion.
2092                  */
2093                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2094                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2095                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2096                         /* not applicable to recovery scan */
2097                         hammer2_chain_unlock(parent);
2098                         return 0;
2099                 }
2100                 hammer2_chain_unlock(parent);
2101                 break;
2102         case HAMMER2_BREF_TYPE_INDIRECT:
2103                 /*
2104                  * Must instantiate data for recursion
2105                  */
2106                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2107                 hammer2_chain_unlock(parent);
2108                 break;
2109         case HAMMER2_BREF_TYPE_DIRENT:
2110         case HAMMER2_BREF_TYPE_DATA:
2111         case HAMMER2_BREF_TYPE_FREEMAP:
2112         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2113         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2114                 /* not applicable to recovery scan */
2115                 return 0;
2116                 break;
2117         default:
2118                 return HAMMER2_ERROR_BADBREF;
2119         }
2120
2121         /*
2122          * Defer operation if depth limit reached or if we are crossing a
2123          * PFS boundary.
2124          */
2125         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2126                 struct hammer2_recovery_elm *elm;
2127
2128                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2129                 elm->chain = parent;
2130                 elm->sync_tid = sync_tid;
2131                 hammer2_chain_ref(parent);
2132                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2133                 /* unlocked by caller */
2134
2135                 return(0);
2136         }
2137
2138
2139         /*
2140          * Recursive scan of the last flushed transaction only.  We are
2141          * doing this without pmp assignments so don't leave the chains
2142          * hanging around after we are done with them.
2143          *
2144          * error        Cumulative error this level only
2145          * rup_error    Cumulative error for recursion
2146          * tmp_error    Specific non-cumulative recursion error
2147          */
2148         chain = NULL;
2149         first = 1;
2150         rup_error = 0;
2151         error = 0;
2152
2153         for (;;) {
2154                 error |= hammer2_chain_scan(parent, &chain, &bref,
2155                                             &first,
2156                                             HAMMER2_LOOKUP_NODATA);
2157
2158                 /*
2159                  * Problem during scan or EOF
2160                  */
2161                 if (error)
2162                         break;
2163
2164                 /*
2165                  * If this is a leaf
2166                  */
2167                 if (chain == NULL) {
2168                         if (bref.mirror_tid > sync_tid) {
2169                                 hammer2_freemap_adjust(hmp, &bref,
2170                                                      HAMMER2_FREEMAP_DORECOVER);
2171                         }
2172                         continue;
2173                 }
2174
2175                 /*
2176                  * This may or may not be a recursive node.
2177                  */
2178                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2179                 if (bref.mirror_tid > sync_tid) {
2180                         ++info->depth;
2181                         tmp_error = hammer2_recovery_scan(hmp, chain,
2182                                                            info, sync_tid);
2183                         --info->depth;
2184                 } else {
2185                         tmp_error = 0;
2186                 }
2187
2188                 /*
2189                  * Flush the recovery at the PFS boundary to stage it for
2190                  * the final flush of the super-root topology.
2191                  */
2192                 if (tmp_error == 0 &&
2193                     (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2194                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2195                         hammer2_flush(chain, HAMMER2_FLUSH_TOP);
2196                 }
2197                 rup_error |= tmp_error;
2198         }
2199         return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2200 }
2201
2202 /*
2203  * Sync a mount point; this is called on a per-mount basis from the
2204  * filesystem syncer process periodically and whenever a user issues
2205  * a sync.
2206  */
2207 int
2208 hammer2_vfs_sync(struct mount *mp, int waitfor)
2209 {
2210         hammer2_xop_flush_t *xop;
2211         struct hammer2_sync_info info;
2212         hammer2_inode_t *iroot;
2213         hammer2_pfs_t *pmp;
2214         int flags;
2215         int error;
2216
2217         pmp = MPTOPMP(mp);
2218         iroot = pmp->iroot;
2219         KKASSERT(iroot);
2220         KKASSERT(iroot->pmp == pmp);
2221
2222         /*
2223          * We can't acquire locks on existing vnodes while in a transaction
2224          * without risking a deadlock.  This assumes that vfsync() can be
2225          * called without the vnode locked (which it can in DragonFly).
2226          * Otherwise we'd have to implement a multi-pass or flag the lock
2227          * failures and retry.
2228          *
2229          * The reclamation code interlocks with the sync list's token
2230          * (by removing the vnode from the scan list) before unlocking
2231          * the inode, giving us time to ref the inode.
2232          */
2233         /*flags = VMSC_GETVP;*/
2234         flags = 0;
2235         if (waitfor & MNT_LAZY)
2236                 flags |= VMSC_ONEPASS;
2237
2238         /*
2239          * Preflush the vnodes using a normal transaction before interlocking
2240          * with a flush transaction.  We do this to try to run as much of
2241          * the compression as possible outside the flush transaction.
2242          *
2243          * For efficiency do an async pass before making sure with a
2244          * synchronous pass on all related buffer cache buffers.
2245          */
2246         hammer2_trans_init(pmp, 0);
2247         info.error = 0;
2248         info.waitfor = MNT_NOWAIT;
2249         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2250         info.waitfor = MNT_WAIT;
2251         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2252         hammer2_trans_done(pmp);
2253
2254         /*
2255          * Start our flush transaction.  This does not return until all
2256          * concurrent transactions have completed and will prevent any
2257          * new transactions from running concurrently, except for the
2258          * buffer cache transactions.
2259          *
2260          * NOTE!  It is still possible for the paging code to push pages
2261          *        out via a UIO_NOCOPY hammer2_vop_write() during the main
2262          *        flush.
2263          */
2264         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2265         hammer2_inode_run_sideq(pmp);
2266
2267         info.error = 0;
2268         info.waitfor = MNT_NOWAIT;
2269         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2270         info.waitfor = MNT_WAIT;
2271         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2272         hammer2_bioq_sync(pmp);
2273
2274         /*
2275          * Use the XOP interface to concurrently flush all nodes to
2276          * synchronize the PFSROOT subtopology to the media.  A standard
2277          * end-of-scan ENOENT error indicates cluster sufficiency.
2278          *
2279          * Note that this flush will not be visible on crash recovery until
2280          * we flush the super-root topology in the next loop.
2281          *
2282          * XXX For now wait for all flushes to complete.
2283          */
2284         if (iroot) {
2285                 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
2286                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2287                 error = hammer2_xop_collect(&xop->head,
2288                                             HAMMER2_XOP_COLLECT_WAITALL);
2289                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2290                 if (error == ENOENT)
2291                         error = 0;
2292         } else {
2293                 error = 0;
2294         }
2295         hammer2_trans_done(pmp);
2296
2297         return (error);
2298 }
2299
2300 /*
2301  * Sync passes.
2302  *
2303  * Note that we ignore the tranasction mtid we got above.  Instead,
2304  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2305  * transactions.
2306  */
2307 static int
2308 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2309 {
2310         struct hammer2_sync_info *info = data;
2311         hammer2_inode_t *ip;
2312         int error;
2313
2314         /*
2315          * Degenerate cases.  Note that ip == NULL typically means the
2316          * syncer vnode itself and we don't want to vclrisdirty() in that
2317          * situation.
2318          */
2319         ip = VTOI(vp);
2320         if (ip == NULL) {
2321                 return(0);
2322         }
2323         if (vp->v_type == VNON || vp->v_type == VBAD) {
2324                 vclrisdirty(vp);
2325                 return(0);
2326         }
2327
2328         /*
2329          * VOP_FSYNC will start a new transaction so replicate some code
2330          * here to do it inline (see hammer2_vop_fsync()).
2331          *
2332          * WARNING: The vfsync interacts with the buffer cache and might
2333          *          block, we can't hold the inode lock at that time.
2334          *          However, we MUST ref ip before blocking to ensure that
2335          *          it isn't ripped out from under us (since we do not
2336          *          hold a lock on the vnode).
2337          */
2338         hammer2_inode_ref(ip);
2339         if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2340             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2341                 vfsync(vp, info->waitfor, 1, NULL, NULL);
2342                 if (ip->flags & (HAMMER2_INODE_RESIZED |
2343                                  HAMMER2_INODE_MODIFIED)) {
2344                         hammer2_inode_lock(ip, 0);
2345                         if (ip->flags & (HAMMER2_INODE_RESIZED |
2346                                          HAMMER2_INODE_MODIFIED)) {
2347                                 hammer2_inode_chain_sync(ip);
2348                         }
2349                         hammer2_inode_unlock(ip);
2350                 }
2351         }
2352         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2353             RB_EMPTY(&vp->v_rbdirty_tree)) {
2354                 vclrisdirty(vp);
2355         }
2356
2357         hammer2_inode_drop(ip);
2358 #if 1
2359         error = 0;
2360         if (error)
2361                 info->error = error;
2362 #endif
2363         return(0);
2364 }
2365
2366 static
2367 int
2368 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2369 {
2370         hammer2_inode_t *ip;
2371
2372         KKASSERT(MAXFIDSZ >= 16);
2373         ip = VTOI(vp);
2374         fhp->fid_len = offsetof(struct fid, fid_data[16]);
2375         fhp->fid_ext = 0;
2376         ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2377         ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2378
2379         return 0;
2380 }
2381
2382 static
2383 int
2384 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2385                struct fid *fhp, struct vnode **vpp)
2386 {
2387         hammer2_pfs_t *pmp;
2388         hammer2_tid_t inum;
2389         int error;
2390
2391         pmp = MPTOPMP(mp);
2392         inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2393         if (vpp) {
2394                 if (inum == 1)
2395                         error = hammer2_vfs_root(mp, vpp);
2396                 else
2397                         error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2398         } else {
2399                 error = 0;
2400         }
2401         if (error)
2402                 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2403         return error;
2404 }
2405
2406 static
2407 int
2408 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2409                  int *exflagsp, struct ucred **credanonp)
2410 {
2411         hammer2_pfs_t *pmp;
2412         struct netcred *np;
2413         int error;
2414
2415         pmp = MPTOPMP(mp);
2416         np = vfs_export_lookup(mp, &pmp->export, nam);
2417         if (np) {
2418                 *exflagsp = np->netc_exflags;
2419                 *credanonp = &np->netc_anon;
2420                 error = 0;
2421         } else {
2422                 error = EACCES;
2423         }
2424         return error;
2425 }
2426
2427 /*
2428  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2429  * header into the HMP
2430  *
2431  * XXX read four volhdrs and use the one with the highest TID whos CRC
2432  *     matches.
2433  *
2434  * XXX check iCRCs.
2435  *
2436  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2437  *     nonexistant locations.
2438  *
2439  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2440  */
2441 static
2442 int
2443 hammer2_install_volume_header(hammer2_dev_t *hmp)
2444 {
2445         hammer2_volume_data_t *vd;
2446         struct buf *bp;
2447         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2448         int error_reported;
2449         int error;
2450         int valid;
2451         int i;
2452
2453         error_reported = 0;
2454         error = 0;
2455         valid = 0;
2456         bp = NULL;
2457
2458         /*
2459          * There are up to 4 copies of the volume header (syncs iterate
2460          * between them so there is no single master).  We don't trust the
2461          * volu_size field so we don't know precisely how large the filesystem
2462          * is, so depend on the OS to return an error if we go beyond the
2463          * block device's EOF.
2464          */
2465         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2466                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2467                               HAMMER2_VOLUME_BYTES, &bp);
2468                 if (error) {
2469                         brelse(bp);
2470                         bp = NULL;
2471                         continue;
2472                 }
2473
2474                 vd = (struct hammer2_volume_data *) bp->b_data;
2475                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2476                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2477                         brelse(bp);
2478                         bp = NULL;
2479                         continue;
2480                 }
2481
2482                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2483                         /* XXX: Reversed-endianness filesystem */
2484                         kprintf("hammer2: reverse-endian filesystem detected");
2485                         brelse(bp);
2486                         bp = NULL;
2487                         continue;
2488                 }
2489
2490                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2491                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2492                                       HAMMER2_VOLUME_ICRC0_SIZE);
2493                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2494                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2495                                        HAMMER2_VOLUME_ICRC1_SIZE);
2496                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2497                         kprintf("hammer2 volume header crc "
2498                                 "mismatch copy #%d %08x/%08x\n",
2499                                 i, crc0, crc);
2500                         error_reported = 1;
2501                         brelse(bp);
2502                         bp = NULL;
2503                         continue;
2504                 }
2505                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2506                         valid = 1;
2507                         hmp->voldata = *vd;
2508                         hmp->volhdrno = i;
2509                 }
2510                 brelse(bp);
2511                 bp = NULL;
2512         }
2513         if (valid) {
2514                 hmp->volsync = hmp->voldata;
2515                 error = 0;
2516                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2517                         kprintf("hammer2: using volume header #%d\n",
2518                                 hmp->volhdrno);
2519                 }
2520         } else {
2521                 error = EINVAL;
2522                 kprintf("hammer2: no valid volume headers found!\n");
2523         }
2524         return (error);
2525 }
2526
2527 /*
2528  * This handles hysteresis on regular file flushes.  Because the BIOs are
2529  * routed to a thread it is possible for an excessive number to build up
2530  * and cause long front-end stalls long before the runningbuffspace limit
2531  * is hit, so we implement hammer2_flush_pipe to control the
2532  * hysteresis.
2533  *
2534  * This is a particular problem when compression is used.
2535  */
2536 void
2537 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2538 {
2539         atomic_add_int(&pmp->count_lwinprog, 1);
2540 }
2541
2542 void
2543 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2544 {
2545         int lwinprog;
2546
2547         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2548         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2549             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2550                 atomic_clear_int(&pmp->count_lwinprog,
2551                                  HAMMER2_LWINPROG_WAITING);
2552                 wakeup(&pmp->count_lwinprog);
2553         }
2554         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2555             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2556                 atomic_clear_int(&pmp->count_lwinprog,
2557                                  HAMMER2_LWINPROG_WAITING0);
2558                 wakeup(&pmp->count_lwinprog);
2559         }
2560 }
2561
2562 void
2563 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2564 {
2565         int lwinprog;
2566         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2567                                     HAMMER2_LWINPROG_WAITING0;
2568
2569         for (;;) {
2570                 lwinprog = pmp->count_lwinprog;
2571                 cpu_ccfence();
2572                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2573                         break;
2574                 tsleep_interlock(&pmp->count_lwinprog, 0);
2575                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2576                 lwinprog = pmp->count_lwinprog;
2577                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2578                         break;
2579                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2580         }
2581 }
2582
2583 /*
2584  * Manage excessive memory resource use for chain and related
2585  * structures.
2586  */
2587 void
2588 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2589 {
2590         uint32_t waiting;
2591         uint32_t count;
2592         uint32_t limit;
2593 #if 0
2594         static int zzticks;
2595 #endif
2596
2597         /*
2598          * Atomic check condition and wait.  Also do an early speedup of
2599          * the syncer to try to avoid hitting the wait.
2600          */
2601         for (;;) {
2602                 waiting = pmp->inmem_dirty_chains;
2603                 cpu_ccfence();
2604                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2605
2606                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2607                 if (limit < hammer2_limit_dirty_chains)
2608                         limit = hammer2_limit_dirty_chains;
2609                 if (limit < 1000)
2610                         limit = 1000;
2611
2612 #if 0
2613                 if ((int)(ticks - zzticks) > hz) {
2614                         zzticks = ticks;
2615                         kprintf("count %ld %ld\n", count, limit);
2616                 }
2617 #endif
2618
2619                 /*
2620                  * Block if there are too many dirty chains present, wait
2621                  * for the flush to clean some out.
2622                  */
2623                 if (count > limit) {
2624                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2625                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2626                                                waiting,
2627                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2628                                 speedup_syncer(pmp->mp);
2629                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2630                                        "chnmem", hz);
2631                         }
2632                         continue;       /* loop on success or fail */
2633                 }
2634
2635                 /*
2636                  * Try to start an early flush before we are forced to block.
2637                  */
2638                 if (count > limit * 7 / 10)
2639                         speedup_syncer(pmp->mp);
2640                 break;
2641         }
2642 }
2643
2644 void
2645 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2646 {
2647         if (pmp) {
2648                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2649         }
2650 }
2651
2652 void
2653 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2654 {
2655         uint32_t waiting;
2656
2657         if (pmp == NULL)
2658                 return;
2659
2660         for (;;) {
2661                 waiting = pmp->inmem_dirty_chains;
2662                 cpu_ccfence();
2663                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2664                                        waiting,
2665                                        (waiting - 1) &
2666                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2667                         break;
2668                 }
2669         }
2670
2671         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2672                 wakeup(&pmp->inmem_dirty_chains);
2673 }
2674
2675 /*
2676  * Debugging
2677  */
2678 void
2679 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2680 {
2681         hammer2_chain_t *scan;
2682         hammer2_chain_t *parent;
2683
2684         --*countp;
2685         if (*countp == 0) {
2686                 kprintf("%*.*s...\n", tab, tab, "");
2687                 return;
2688         }
2689         if (*countp < 0)
2690                 return;
2691         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2692                 tab, tab, "", pfx,
2693                 chain, chain->bref.type,
2694                 chain->bref.key, chain->bref.keybits,
2695                 chain->bref.mirror_tid);
2696
2697         kprintf("%*.*s      [%08x] (%s) refs=%d",
2698                 tab, tab, "",
2699                 chain->flags,
2700                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2701                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2702                 chain->refs);
2703
2704         parent = chain->parent;
2705         if (parent)
2706                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2707                         tab, tab, "",
2708                         parent, parent->flags, parent->refs);
2709         if (RB_EMPTY(&chain->core.rbtree)) {
2710                 kprintf("\n");
2711         } else {
2712                 kprintf(" {\n");
2713                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2714                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2715                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2716                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2717                                 chain->data->ipdata.filename);
2718                 else
2719                         kprintf("%*.*s}\n", tab, tab, "");
2720         }
2721 }