sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2018 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         int error;
  71         int waitfor;
  72         int pass;
  73 };
  74
  75 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  76 static struct hammer2_mntlist hammer2_mntlist;
  77
  78 struct hammer2_pfslist hammer2_pfslist;
  79 struct hammer2_pfslist hammer2_spmplist;
  80 struct lock hammer2_mntlk;
  81
  82 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT;
  83 int hammer2_debug;
  84 int hammer2_cluster_meta_read = 1;      /* physical read-ahead */
  85 int hammer2_cluster_data_read = 4;      /* physical read-ahead */
  86 int hammer2_dedup_enable = 1;
  87 int hammer2_always_compress = 0;        /* always try to compress */
  88 int hammer2_inval_enable = 0;
  89 int hammer2_flush_pipe = 100;
  90 int hammer2_dio_count;
  91 int hammer2_dio_limit = 256;
  92 int hammer2_bulkfree_tps = 5000;
  93 long hammer2_chain_allocs;
  94 long hammer2_chain_frees;
  95 long hammer2_limit_dirty_chains;
  96 long hammer2_limit_dirty_inodes;
  97 long hammer2_count_modified_chains;
  98 long hammer2_iod_invals;
  99 long hammer2_iod_file_read;
 100 long hammer2_iod_meta_read;
 101 long hammer2_iod_indr_read;
 102 long hammer2_iod_fmap_read;
 103 long hammer2_iod_volu_read;
 104 long hammer2_iod_file_write;
 105 long hammer2_iod_file_wembed;
 106 long hammer2_iod_file_wzero;
 107 long hammer2_iod_file_wdedup;
 108 long hammer2_iod_meta_write;
 109 long hammer2_iod_indr_write;
 110 long hammer2_iod_fmap_write;
 111 long hammer2_iod_volu_write;
 112
 113 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 114 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 115                 "Buffer used for compression.");
 116
 117 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 118 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 119                 "Buffer used for decompression.");
 120
 121 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 122
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
 124            &hammer2_supported_version, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 126            &hammer2_debug, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
 128            &hammer2_cluster_meta_read, 0, "");
 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
 130            &hammer2_cluster_data_read, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
 132            &hammer2_dedup_enable, 0, "");
 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
 134            &hammer2_always_compress, 0, "");
 135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
 136            &hammer2_inval_enable, 0, "");
 137 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 138            &hammer2_flush_pipe, 0, "");
 139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
 140            &hammer2_bulkfree_tps, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
 142            &hammer2_chain_allocs, 0, "");
 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
 144            &hammer2_chain_frees, 0, "");
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 146            &hammer2_limit_dirty_chains, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW,
 148            &hammer2_limit_dirty_inodes, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 150            &hammer2_count_modified_chains, 0, "");
 151 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 152            &hammer2_dio_count, 0, "");
 153 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
 154            &hammer2_dio_limit, 0, "");
 155
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
 157            &hammer2_iod_invals, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 159            &hammer2_iod_file_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 161            &hammer2_iod_meta_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 163            &hammer2_iod_indr_read, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 165            &hammer2_iod_fmap_read, 0, "");
 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 167            &hammer2_iod_volu_read, 0, "");
 168
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 170            &hammer2_iod_file_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 172            &hammer2_iod_file_wembed, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 174            &hammer2_iod_file_wzero, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 176            &hammer2_iod_file_wdedup, 0, "");
 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 178            &hammer2_iod_meta_write, 0, "");
 179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 180            &hammer2_iod_indr_write, 0, "");
 181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 182            &hammer2_iod_fmap_write, 0, "");
 183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 184            &hammer2_iod_volu_write, 0, "");
 185
 186 long hammer2_process_icrc32;
 187 long hammer2_process_xxhash64;
 188 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW,
 189            &hammer2_process_icrc32, 0, "");
 190 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW,
 191            &hammer2_process_xxhash64, 0, "");
 192
 193 static int hammer2_vfs_init(struct vfsconf *conf);
 194 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 195 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 196                                 struct ucred *cred);
 197 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 198                                 struct vnode *, struct ucred *);
 199 static int hammer2_recovery(hammer2_dev_t *hmp);
 200 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 201 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 202 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 203                                 struct ucred *cred);
 204 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 205                                 struct ucred *cred);
 206 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 207                                 struct fid *fhp, struct vnode **vpp);
 208 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 209 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 210                                 int *exflagsp, struct ucred **credanonp);
 211
 212 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 213 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 214
 215 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 216
 217 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 218 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 219                                 hammer2_dev_t *hmp);
 220 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
 221
 222 /*
 223  * HAMMER2 vfs operations.
 224  */
 225 static struct vfsops hammer2_vfsops = {
 226         .vfs_init       = hammer2_vfs_init,
 227         .vfs_uninit     = hammer2_vfs_uninit,
 228         .vfs_sync       = hammer2_vfs_sync,
 229         .vfs_mount      = hammer2_vfs_mount,
 230         .vfs_unmount    = hammer2_vfs_unmount,
 231         .vfs_root       = hammer2_vfs_root,
 232         .vfs_statfs     = hammer2_vfs_statfs,
 233         .vfs_statvfs    = hammer2_vfs_statvfs,
 234         .vfs_vget       = hammer2_vfs_vget,
 235         .vfs_vptofh     = hammer2_vfs_vptofh,
 236         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 237         .vfs_checkexp   = hammer2_vfs_checkexp
 238 };
 239
 240 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 241
 242 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
 243 MODULE_VERSION(hammer2, 1);
 244
 245 static
 246 int
 247 hammer2_vfs_init(struct vfsconf *conf)
 248 {
 249         static struct objcache_malloc_args margs_read;
 250         static struct objcache_malloc_args margs_write;
 251         static struct objcache_malloc_args margs_vop;
 252
 253         int error;
 254
 255         error = 0;
 256
 257         /*
 258          * A large DIO cache is needed to retain dedup enablement masks.
 259          * The bulkfree code clears related masks as part of the disk block
 260          * recycling algorithm, preventing it from being used for a later
 261          * dedup.
 262          *
 263          * NOTE: A large buffer cache can actually interfere with dedup
 264          *       operation because we dedup based on media physical buffers
 265          *       and not logical buffers.  Try to make the DIO case large
 266          *       enough to avoid this problem, but also cap it.
 267          */
 268         hammer2_dio_limit = nbuf * 2;
 269         if (hammer2_dio_limit > 100000)
 270                 hammer2_dio_limit = 100000;
 271
 272         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 273                 error = EINVAL;
 274         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 275                 error = EINVAL;
 276         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 277                 error = EINVAL;
 278
 279         if (error)
 280                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 281
 282         margs_read.objsize = 65536;
 283         margs_read.mtype = M_HAMMER2_DEBUFFER;
 284
 285         margs_write.objsize = 32768;
 286         margs_write.mtype = M_HAMMER2_CBUFFER;
 287
 288         margs_vop.objsize = sizeof(hammer2_xop_t);
 289         margs_vop.mtype = M_HAMMER2;
 290
 291         /*
 292          * Note thaht for the XOPS cache we want backing store allocations
 293          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 294          * confusion), so use the backing store function that does it.  This
 295          * means that initial XOPS objects are zerod but REUSED objects are
 296          * not.  So we are responsible for cleaning the object up sufficiently
 297          * for our needs before objcache_put()ing it back (typically just the
 298          * FIFO indices).
 299          */
 300         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 301                                 0, 1, NULL, NULL, NULL,
 302                                 objcache_malloc_alloc,
 303                                 objcache_malloc_free,
 304                                 &margs_read);
 305         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 306                                 0, 1, NULL, NULL, NULL,
 307                                 objcache_malloc_alloc,
 308                                 objcache_malloc_free,
 309                                 &margs_write);
 310         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 311                                 0, 1, NULL, NULL, NULL,
 312                                 objcache_malloc_alloc_zero,
 313                                 objcache_malloc_free,
 314                                 &margs_vop);
 315
 316
 317         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 318         TAILQ_INIT(&hammer2_mntlist);
 319         TAILQ_INIT(&hammer2_pfslist);
 320         TAILQ_INIT(&hammer2_spmplist);
 321
 322         hammer2_limit_dirty_chains = maxvnodes / 10;
 323         if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
 324                 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
 325
 326         hammer2_limit_dirty_inodes = maxvnodes / 100;
 327         if (hammer2_limit_dirty_inodes < 100)
 328                 hammer2_limit_dirty_inodes = 100;
 329         if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES)
 330                 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES;
 331
 332         return (error);
 333 }
 334
 335 static
 336 int
 337 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 338 {
 339         objcache_destroy(cache_buffer_read);
 340         objcache_destroy(cache_buffer_write);
 341         objcache_destroy(cache_xops);
 342         return 0;
 343 }
 344
 345 /*
 346  * Core PFS allocator.  Used to allocate or reference the pmp structure
 347  * for PFS cluster mounts and the spmp structure for media (hmp) structures.
 348  * The pmp can be passed in or loaded by this function using the chain and
 349  * inode data.
 350  *
 351  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 352  * transactions.  Note that synchronization does not use this field.
 353  * (typically frontend operations and synchronization cannot run on the
 354  * same PFS node at the same time).
 355  *
 356  * XXX check locking
 357  */
 358 hammer2_pfs_t *
 359 hammer2_pfsalloc(hammer2_chain_t *chain,
 360                  const hammer2_inode_data_t *ripdata,
 361                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 362 {
 363         hammer2_pfs_t *pmp;
 364         hammer2_inode_t *iroot;
 365         int count;
 366         int i;
 367         int j;
 368
 369         pmp = NULL;
 370
 371         /*
 372          * Locate or create the PFS based on the cluster id.  If ripdata
 373          * is NULL this is a spmp which is unique and is always allocated.
 374          *
 375          * If the device is mounted in local mode all PFSs are considered
 376          * independent and not part of any cluster (for debugging only).
 377          */
 378         if (ripdata) {
 379                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 380                         if (force_local != pmp->force_local)
 381                                 continue;
 382                         if (force_local == NULL &&
 383                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 384                                  sizeof(pmp->pfs_clid)) == 0) {
 385                                         break;
 386                         } else if (force_local && pmp->pfs_names[0] &&
 387                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 388                                         break;
 389                         }
 390                 }
 391         }
 392
 393         if (pmp == NULL) {
 394                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 395                 pmp->force_local = force_local;
 396                 hammer2_trans_manage_init(pmp);
 397                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 398                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 399                 lockinit(&pmp->lock, "pfslk", 0, 0);
 400                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 401                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 402                 spin_init(&pmp->xop_spin, "h2xop");
 403                 spin_init(&pmp->lru_spin, "h2lru");
 404                 RB_INIT(&pmp->inum_tree);
 405                 TAILQ_INIT(&pmp->sideq);
 406                 TAILQ_INIT(&pmp->lru_list);
 407                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 408
 409                 /*
 410                  * Distribute backend operations to threads
 411                  */
 412                 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
 413                         hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
 414
 415                 /*
 416                  * Save the last media transaction id for the flusher.  Set
 417                  * initial
 418                  */
 419                 if (ripdata) {
 420                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 421                         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 422                 } else {
 423                         pmp->flags |= HAMMER2_PMPF_SPMP;
 424                         TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
 425                 }
 426
 427                 /*
 428                  * The synchronization thread may start too early, make
 429                  * sure it stays frozen until we are ready to let it go.
 430                  * XXX
 431                  */
 432                 /*
 433                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 434                                          HAMMER2_THREAD_REMASTER;
 435                 */
 436         }
 437
 438         /*
 439          * Create the PFS's root inode and any missing XOP helper threads.
 440          */
 441         if ((iroot = pmp->iroot) == NULL) {
 442                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 443                 if (ripdata)
 444                         iroot->meta = ripdata->meta;
 445                 pmp->iroot = iroot;
 446                 hammer2_inode_ref(iroot);
 447                 hammer2_inode_unlock(iroot);
 448         }
 449
 450         /*
 451          * Stop here if no chain is passed in.
 452          */
 453         if (chain == NULL)
 454                 goto done;
 455
 456         /*
 457          * When a chain is passed in we must add it to the PFS's root
 458          * inode, update pmp->pfs_types[], and update the syncronization
 459          * threads.
 460          *
 461          * When forcing local mode, mark the PFS as a MASTER regardless.
 462          *
 463          * At the moment empty spots can develop due to removals or failures.
 464          * Ultimately we want to re-fill these spots but doing so might
 465          * confused running code. XXX
 466          */
 467         hammer2_inode_ref(iroot);
 468         hammer2_mtx_ex(&iroot->lock);
 469         j = iroot->cluster.nchains;
 470
 471         if (j == HAMMER2_MAXCLUSTER) {
 472                 kprintf("hammer2_mount: cluster full!\n");
 473                 /* XXX fatal error? */
 474         } else {
 475                 KKASSERT(chain->pmp == NULL);
 476                 chain->pmp = pmp;
 477                 hammer2_chain_ref(chain);
 478                 iroot->cluster.array[j].chain = chain;
 479                 if (force_local)
 480                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 481                 else
 482                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 483                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 484                 pmp->pfs_hmps[j] = chain->hmp;
 485
 486                 /*
 487                  * If the PFS is already mounted we must account
 488                  * for the mount_count here.
 489                  */
 490                 if (pmp->mp)
 491                         ++chain->hmp->mount_count;
 492
 493                 /*
 494                  * May have to fixup dirty chain tracking.  Previous
 495                  * pmp was NULL so nothing to undo.
 496                  */
 497                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 498                         hammer2_pfs_memory_inc(pmp);
 499                 ++j;
 500         }
 501         iroot->cluster.nchains = j;
 502
 503         /*
 504          * Update nmasters from any PFS inode which is part of the cluster.
 505          * It is possible that this will result in a value which is too
 506          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 507          * override this value later on.
 508          *
 509          * (This informs us of masters that might not currently be
 510          *  discoverable by this mount).
 511          */
 512         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 513                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 514         }
 515
 516         /*
 517          * Count visible masters.  Masters are usually added with
 518          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 519          * are more (XXX and must update the master inodes).
 520          */
 521         count = 0;
 522         for (i = 0; i < iroot->cluster.nchains; ++i) {
 523                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 524                         ++count;
 525         }
 526         if (pmp->pfs_nmasters < count)
 527                 pmp->pfs_nmasters = count;
 528
 529         /*
 530          * Create missing synchronization and support threads.
 531          *
 532          * Single-node masters (including snapshots) have nothing to
 533          * synchronize and do not require this thread.
 534          *
 535          * Multi-node masters or any number of soft masters, slaves, copy,
 536          * or other PFS types need the thread.
 537          *
 538          * Each thread is responsible for its particular cluster index.
 539          * We use independent threads so stalls or mismatches related to
 540          * any given target do not affect other targets.
 541          */
 542         for (i = 0; i < iroot->cluster.nchains; ++i) {
 543                 /*
 544                  * Single-node masters (including snapshots) have nothing
 545                  * to synchronize and will make direct xops support calls,
 546                  * thus they do not require this thread.
 547                  *
 548                  * Note that there can be thousands of snapshots.  We do not
 549                  * want to create thousands of threads.
 550                  */
 551                 if (pmp->pfs_nmasters <= 1 &&
 552                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 553                         continue;
 554                 }
 555
 556                 /*
 557                  * Sync support thread
 558                  */
 559                 if (pmp->sync_thrs[i].td == NULL) {
 560                         hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
 561                                            "h2nod", i, -1,
 562                                            hammer2_primary_sync_thread);
 563                 }
 564         }
 565
 566         /*
 567          * Create missing Xop threads
 568          *
 569          * NOTE: We create helper threads for all mounted PFSs or any
 570          *       PFSs with 2+ nodes (so the sync thread can update them,
 571          *       even if not mounted).
 572          */
 573         if (pmp->mp || iroot->cluster.nchains >= 2)
 574                 hammer2_xop_helper_create(pmp);
 575
 576         hammer2_mtx_unlock(&iroot->lock);
 577         hammer2_inode_drop(iroot);
 578 done:
 579         return pmp;
 580 }
 581
 582 /*
 583  * Deallocate an element of a probed PFS.  If destroying and this is a
 584  * MASTER, adjust nmasters.
 585  *
 586  * This function does not physically destroy the PFS element in its device
 587  * under the super-root  (see hammer2_ioctl_pfs_delete()).
 588  */
 589 void
 590 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
 591 {
 592         hammer2_inode_t *iroot;
 593         hammer2_chain_t *chain;
 594         int j;
 595
 596         /*
 597          * Cleanup our reference on iroot.  iroot is (should) not be needed
 598          * by the flush code.
 599          */
 600         iroot = pmp->iroot;
 601         if (iroot) {
 602                 /*
 603                  * Stop synchronizing
 604                  *
 605                  * XXX flush after acquiring the iroot lock.
 606                  * XXX clean out the cluster index from all inode structures.
 607                  */
 608                 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
 609
 610                 /*
 611                  * Remove the cluster index from the group.  If destroying
 612                  * the PFS and this is a master, adjust pfs_nmasters.
 613                  */
 614                 hammer2_mtx_ex(&iroot->lock);
 615                 chain = iroot->cluster.array[clindex].chain;
 616                 iroot->cluster.array[clindex].chain = NULL;
 617
 618                 switch(pmp->pfs_types[clindex]) {
 619                 case HAMMER2_PFSTYPE_MASTER:
 620                         if (destroying && pmp->pfs_nmasters > 0)
 621                                 --pmp->pfs_nmasters;
 622                         /* XXX adjust ripdata->meta.pfs_nmasters */
 623                         break;
 624                 default:
 625                         break;
 626                 }
 627                 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
 628
 629                 hammer2_mtx_unlock(&iroot->lock);
 630
 631                 /*
 632                  * Release the chain.
 633                  */
 634                 if (chain) {
 635                         atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 636                         hammer2_chain_drop(chain);
 637                 }
 638
 639                 /*
 640                  * Terminate all XOP threads for the cluster index.
 641                  */
 642                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 643                         hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
 644         }
 645 }
 646
 647 /*
 648  * Destroy a PFS, typically only occurs after the last mount on a device
 649  * has gone away.
 650  */
 651 static void
 652 hammer2_pfsfree(hammer2_pfs_t *pmp)
 653 {
 654         hammer2_inode_t *iroot;
 655         hammer2_chain_t *chain;
 656         int i;
 657         int j;
 658
 659         /*
 660          * Cleanup our reference on iroot.  iroot is (should) not be needed
 661          * by the flush code.
 662          */
 663         if (pmp->flags & HAMMER2_PMPF_SPMP)
 664                 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
 665         else
 666                 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 667
 668         iroot = pmp->iroot;
 669         if (iroot) {
 670                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 671                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 672                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 673                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 674                 }
 675 #if REPORT_REFS_ERRORS
 676                 if (pmp->iroot->refs != 1)
 677                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 678                                 pmp->iroot, pmp->iroot->refs);
 679 #else
 680                 KKASSERT(pmp->iroot->refs == 1);
 681 #endif
 682                 /* ref for pmp->iroot */
 683                 hammer2_inode_drop(pmp->iroot);
 684                 pmp->iroot = NULL;
 685         }
 686
 687         /*
 688          * Cleanup chains remaining on LRU list.
 689          */
 690         hammer2_spin_ex(&pmp->lru_spin);
 691         while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
 692                 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
 693                 atomic_add_int(&pmp->lru_count, -1);
 694                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
 695                 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
 696                 hammer2_chain_ref(chain);
 697                 hammer2_spin_unex(&pmp->lru_spin);
 698                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 699                 hammer2_chain_drop(chain);
 700                 hammer2_spin_ex(&pmp->lru_spin);
 701         }
 702         hammer2_spin_unex(&pmp->lru_spin);
 703
 704         /*
 705          * Free remaining pmp resources
 706          */
 707         kmalloc_destroy(&pmp->mmsg);
 708         kmalloc_destroy(&pmp->minode);
 709
 710         kfree(pmp, M_HAMMER2);
 711 }
 712
 713 /*
 714  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 715  * empty is terminated and freed.
 716  *
 717  * XXX inefficient.
 718  */
 719 static void
 720 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
 721 {
 722         hammer2_pfs_t *pmp;
 723         hammer2_inode_t *iroot;
 724         hammer2_chain_t *rchain;
 725         int didfreeze;
 726         int i;
 727         int j;
 728         struct hammer2_pfslist *wlist;
 729
 730         if (which == 0)
 731                 wlist = &hammer2_pfslist;
 732         else
 733                 wlist = &hammer2_spmplist;
 734 again:
 735         TAILQ_FOREACH(pmp, wlist, mntentry) {
 736                 if ((iroot = pmp->iroot) == NULL)
 737                         continue;
 738                 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
 739                 hammer2_inode_run_sideq(pmp, 1);
 740                 hammer2_bioq_sync(pmp);
 741                 hammer2_trans_done(pmp, 0);
 742
 743                 /*
 744                  * Determine if this PFS is affected.  If it is we must
 745                  * freeze all management threads and lock its iroot.
 746                  *
 747                  * Freezing a management thread forces it idle, operations
 748                  * in-progress will be aborted and it will have to start
 749                  * over again when unfrozen, or exit if told to exit.
 750                  */
 751                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 752                         if (pmp->pfs_hmps[i] == hmp)
 753                                 break;
 754                 }
 755                 if (i != HAMMER2_MAXCLUSTER) {
 756                         /*
 757                          * Make sure all synchronization threads are locked
 758                          * down.
 759                          */
 760                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 761                                 if (pmp->pfs_hmps[i] == NULL)
 762                                         continue;
 763                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 764                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 765                                         hammer2_thr_freeze_async(
 766                                                 &pmp->xop_groups[j].thrs[i]);
 767                                 }
 768                         }
 769                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 770                                 if (pmp->pfs_hmps[i] == NULL)
 771                                         continue;
 772                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 773                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 774                                         hammer2_thr_freeze(
 775                                                 &pmp->xop_groups[j].thrs[i]);
 776                                 }
 777                         }
 778
 779                         /*
 780                          * Lock the inode and clean out matching chains.
 781                          * Note that we cannot use hammer2_inode_lock_*()
 782                          * here because that would attempt to validate the
 783                          * cluster that we are in the middle of ripping
 784                          * apart.
 785                          *
 786                          * WARNING! We are working directly on the inodes
 787                          *          embedded cluster.
 788                          */
 789                         hammer2_mtx_ex(&iroot->lock);
 790
 791                         /*
 792                          * Remove the chain from matching elements of the PFS.
 793                          */
 794                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 795                                 if (pmp->pfs_hmps[i] != hmp)
 796                                         continue;
 797                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 798                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 799                                         hammer2_thr_delete(
 800                                                 &pmp->xop_groups[j].thrs[i]);
 801                                 }
 802                                 rchain = iroot->cluster.array[i].chain;
 803                                 iroot->cluster.array[i].chain = NULL;
 804                                 pmp->pfs_types[i] = 0;
 805                                 if (pmp->pfs_names[i]) {
 806                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 807                                         pmp->pfs_names[i] = NULL;
 808                                 }
 809                                 if (rchain) {
 810                                         hammer2_chain_drop(rchain);
 811                                         /* focus hint */
 812                                         if (iroot->cluster.focus == rchain)
 813                                                 iroot->cluster.focus = NULL;
 814                                 }
 815                                 pmp->pfs_hmps[i] = NULL;
 816                         }
 817                         hammer2_mtx_unlock(&iroot->lock);
 818                         didfreeze = 1;  /* remaster, unfreeze down below */
 819                 } else {
 820                         didfreeze = 0;
 821                 }
 822
 823                 /*
 824                  * Cleanup trailing chains.  Gaps may remain.
 825                  */
 826                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 827                         if (pmp->pfs_hmps[i])
 828                                 break;
 829                 }
 830                 iroot->cluster.nchains = i + 1;
 831
 832                 /*
 833                  * If the PMP has no elements remaining we can destroy it.
 834                  * (this will transition management threads from frozen->exit).
 835                  */
 836                 if (iroot->cluster.nchains == 0) {
 837                         /*
 838                          * If this was the hmp's spmp, we need to clean
 839                          * a little more stuff out.
 840                          */
 841                         if (hmp->spmp == pmp) {
 842                                 hmp->spmp = NULL;
 843                                 hmp->vchain.pmp = NULL;
 844                                 hmp->fchain.pmp = NULL;
 845                         }
 846
 847                         /*
 848                          * Free the pmp and restart the loop
 849                          */
 850                         hammer2_pfsfree(pmp);
 851                         goto again;
 852                 }
 853
 854                 /*
 855                  * If elements still remain we need to set the REMASTER
 856                  * flag and unfreeze it.
 857                  */
 858                 if (didfreeze) {
 859                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 860                                 if (pmp->pfs_hmps[i] == NULL)
 861                                         continue;
 862                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 863                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 864                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 865                                         hammer2_thr_remaster(
 866                                                 &pmp->xop_groups[j].thrs[i]);
 867                                         hammer2_thr_unfreeze(
 868                                                 &pmp->xop_groups[j].thrs[i]);
 869                                 }
 870                         }
 871                 }
 872         }
 873 }
 874
 875 /*
 876  * Mount or remount HAMMER2 fileystem from physical media
 877  *
 878  *      mountroot
 879  *              mp              mount point structure
 880  *              path            NULL
 881  *              data            <unused>
 882  *              cred            <unused>
 883  *
 884  *      mount
 885  *              mp              mount point structure
 886  *              path            path to mount point
 887  *              data            pointer to argument structure in user space
 888  *                      volume  volume path (device@LABEL form)
 889  *                      hflags  user mount flags
 890  *              cred            user credentials
 891  *
 892  * RETURNS:     0       Success
 893  *              !0      error number
 894  */
 895 static
 896 int
 897 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 898                   struct ucred *cred)
 899 {
 900         struct hammer2_mount_info info;
 901         hammer2_pfs_t *pmp;
 902         hammer2_pfs_t *spmp;
 903         hammer2_dev_t *hmp;
 904         hammer2_dev_t *force_local;
 905         hammer2_key_t key_next;
 906         hammer2_key_t key_dummy;
 907         hammer2_key_t lhc;
 908         struct vnode *devvp;
 909         struct nlookupdata nd;
 910         hammer2_chain_t *parent;
 911         hammer2_chain_t *chain;
 912         const hammer2_inode_data_t *ripdata;
 913         hammer2_blockref_t bref;
 914         struct file *fp;
 915         char devstr[MNAMELEN];
 916         size_t size;
 917         size_t done;
 918         char *dev;
 919         char *label;
 920         int ronly = 1;
 921         int error;
 922         int i;
 923
 924         hmp = NULL;
 925         pmp = NULL;
 926         dev = NULL;
 927         label = NULL;
 928         devvp = NULL;
 929
 930         if (path == NULL) {
 931                 /*
 932                  * Root mount
 933                  */
 934                 bzero(&info, sizeof(info));
 935                 info.cluster_fd = -1;
 936                 ksnprintf(devstr, sizeof(devstr), "%s",
 937                           mp->mnt_stat.f_mntfromname);
 938                 kprintf("hammer2_mount: root '%s'\n", devstr);
 939                 done = strlen(devstr) + 1;
 940         } else {
 941                 /*
 942                  * Non-root mount or updating a mount
 943                  */
 944                 error = copyin(data, &info, sizeof(info));
 945                 if (error)
 946                         return (error);
 947
 948                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 949                 if (error)
 950                         return (error);
 951                 kprintf("hammer2_mount: '%s'\n", devstr);
 952         }
 953
 954         /*
 955          * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
 956          * if no label specified, based on the partition id.  Error out if no
 957          * label or device (with partition id) is specified.  This is strictly
 958          * a convenience to match the default label created by newfs_hammer2,
 959          * our preference is that a label always be specified.
 960          *
 961          * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command
 962          *       that does not specify a device, as long as some H2 label
 963          *       has already been mounted from that device.  This makes
 964          *       mounting snapshots a lot easier.
 965          */
 966         dev = devstr;
 967         label = strchr(devstr, '@');
 968         if (label && ((label + 1) - dev) > done) {
 969                 kprintf("hammer2: mount: bad label %s/%zd\n",
 970                         devstr, done);
 971                 return (EINVAL);
 972         }
 973         if (label == NULL || label[1] == 0) {
 974                 char slice;
 975
 976                 if (label == NULL)
 977                         label = devstr + strlen(devstr);
 978                 else
 979                         *label = '\0';          /* clean up trailing @ */
 980
 981                 slice = label[-1];
 982                 switch(slice) {
 983                 case 'a':
 984                         label = "BOOT";
 985                         break;
 986                 case 'd':
 987                         label = "ROOT";
 988                         break;
 989                 default:
 990                         label = "DATA";
 991                         break;
 992                 }
 993         } else {
 994                 *label = '\0';
 995                 label++;
 996         }
 997
 998         kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
 999                 dev, label, (mp->mnt_flag & MNT_RDONLY));
1000
1001         if (mp->mnt_flag & MNT_UPDATE) {
1002                 /*
1003                  * Update mount.  Note that pmp->iroot->cluster is
1004                  * an inode-embedded cluster and thus cannot be
1005                  * directly locked.
1006                  *
1007                  * XXX HAMMER2 needs to implement NFS export via
1008                  *     mountctl.
1009                  */
1010                 hammer2_cluster_t *cluster;
1011
1012                 pmp = MPTOPMP(mp);
1013                 pmp->hflags = info.hflags;
1014                 cluster = &pmp->iroot->cluster;
1015                 for (i = 0; i < cluster->nchains; ++i) {
1016                         if (cluster->array[i].chain == NULL)
1017                                 continue;
1018                         hmp = cluster->array[i].chain->hmp;
1019                         devvp = hmp->devvp;
1020                         error = hammer2_remount(hmp, mp, path,
1021                                                 devvp, cred);
1022                         if (error)
1023                                 break;
1024                 }
1025
1026                 return error;
1027         }
1028
1029         /*
1030          * HMP device mount
1031          *
1032          * If a path is specified and dev is not an empty string, lookup the
1033          * name and verify that it referes to a block device.
1034          *
1035          * If a path is specified and dev is an empty string we fall through
1036          * and locate the label in the hmp search.
1037          */
1038         if (path && *dev != 0) {
1039                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
1040                 if (error == 0)
1041                         error = nlookup(&nd);
1042                 if (error == 0)
1043                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
1044                 nlookup_done(&nd);
1045         } else if (path == NULL) {
1046                 /* root mount */
1047                 cdev_t cdev = kgetdiskbyname(dev);
1048                 error = bdevvp(cdev, &devvp);
1049                 if (error)
1050                         kprintf("hammer2: cannot find '%s'\n", dev);
1051         } else {
1052                 /*
1053                  * We will locate the hmp using the label in the hmp loop.
1054                  */
1055                 error = 0;
1056         }
1057
1058         /*
1059          * Make sure its a block device.  Do not check to see if it is
1060          * already mounted until we determine that its a fresh H2 device.
1061          */
1062         if (error == 0 && devvp) {
1063                 vn_isdisk(devvp, &error);
1064         }
1065
1066         /*
1067          * Determine if the device has already been mounted.  After this
1068          * check hmp will be non-NULL if we are doing the second or more
1069          * hammer2 mounts from the same device.
1070          */
1071         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1072         if (devvp) {
1073                 /*
1074                  * Match the device.  Due to the way devfs works,
1075                  * we may not be able to directly match the vnode pointer,
1076                  * so also check to see if the underlying device matches.
1077                  */
1078                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1079                         if (hmp->devvp == devvp)
1080                                 break;
1081                         if (devvp->v_rdev &&
1082                             hmp->devvp->v_rdev == devvp->v_rdev) {
1083                                 break;
1084                         }
1085                 }
1086
1087                 /*
1088                  * If no match this may be a fresh H2 mount, make sure
1089                  * the device is not mounted on anything else.
1090                  */
1091                 if (hmp == NULL)
1092                         error = vfs_mountedon(devvp);
1093         } else if (error == 0) {
1094                 /*
1095                  * Match the label to a pmp already probed.
1096                  */
1097                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1098                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1099                                 if (pmp->pfs_names[i] &&
1100                                     strcmp(pmp->pfs_names[i], label) == 0) {
1101                                         hmp = pmp->pfs_hmps[i];
1102                                         break;
1103                                 }
1104                         }
1105                         if (hmp)
1106                                 break;
1107                 }
1108                 if (hmp == NULL)
1109                         error = ENOENT;
1110         }
1111
1112         /*
1113          * Open the device if this isn't a secondary mount and construct
1114          * the H2 device mount (hmp).
1115          */
1116         if (hmp == NULL) {
1117                 hammer2_chain_t *schain;
1118                 hammer2_xid_t xid;
1119                 hammer2_xop_head_t xop;
1120
1121                 if (error == 0 && vcount(devvp) > 0) {
1122                         kprintf("Primary device already has references\n");
1123                         error = EBUSY;
1124                 }
1125
1126                 /*
1127                  * Now open the device
1128                  */
1129                 if (error == 0) {
1130                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1131                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1132                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
1133                         if (error == 0) {
1134                                 error = VOP_OPEN(devvp,
1135                                              (ronly ? FREAD : FREAD | FWRITE),
1136                                              FSCRED, NULL);
1137                         }
1138                         vn_unlock(devvp);
1139                 }
1140                 if (error && devvp) {
1141                         vrele(devvp);
1142                         devvp = NULL;
1143                 }
1144                 if (error) {
1145                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1146                         return error;
1147                 }
1148                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1149                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1150                 hmp->ronly = ronly;
1151                 hmp->devvp = devvp;
1152                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1153                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1154                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1155                 RB_INIT(&hmp->iotree);
1156                 spin_init(&hmp->io_spin, "hm2mount_io");
1157                 spin_init(&hmp->list_spin, "hm2mount_list");
1158                 TAILQ_INIT(&hmp->flushq);
1159
1160                 lockinit(&hmp->vollk, "h2vol", 0, 0);
1161                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1162                 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1163
1164                 /*
1165                  * vchain setup. vchain.data is embedded.
1166                  * vchain.refs is initialized and will never drop to 0.
1167                  *
1168                  * NOTE! voldata is not yet loaded.
1169                  */
1170                 hmp->vchain.hmp = hmp;
1171                 hmp->vchain.refs = 1;
1172                 hmp->vchain.data = (void *)&hmp->voldata;
1173                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1174                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1175                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1176
1177                 hammer2_chain_core_init(&hmp->vchain);
1178                 /* hmp->vchain.u.xxx is left NULL */
1179
1180                 /*
1181                  * fchain setup.  fchain.data is embedded.
1182                  * fchain.refs is initialized and will never drop to 0.
1183                  *
1184                  * The data is not used but needs to be initialized to
1185                  * pass assertion muster.  We use this chain primarily
1186                  * as a placeholder for the freemap's top-level RBTREE
1187                  * so it does not interfere with the volume's topology
1188                  * RBTREE.
1189                  */
1190                 hmp->fchain.hmp = hmp;
1191                 hmp->fchain.refs = 1;
1192                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1193                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1194                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1195                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1196                 hmp->fchain.bref.methods =
1197                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1198                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1199
1200                 hammer2_chain_core_init(&hmp->fchain);
1201                 /* hmp->fchain.u.xxx is left NULL */
1202
1203                 /*
1204                  * Install the volume header and initialize fields from
1205                  * voldata.
1206                  */
1207                 error = hammer2_install_volume_header(hmp);
1208                 if (error) {
1209                         hammer2_unmount_helper(mp, NULL, hmp);
1210                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1211                         hammer2_vfs_unmount(mp, MNT_FORCE);
1212                         return error;
1213                 }
1214
1215                 /*
1216                  * Really important to get these right or flush will get
1217                  * confused.
1218                  */
1219                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1220                 spmp = hmp->spmp;
1221
1222                 /*
1223                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
1224                  * is inherited from the volume header.
1225                  */
1226                 xid = 0;
1227                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1228                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1229                 hmp->vchain.pmp = spmp;
1230                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1231                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1232                 hmp->fchain.pmp = spmp;
1233
1234                 /*
1235                  * First locate the super-root inode, which is key 0
1236                  * relative to the volume header's blockset.
1237                  *
1238                  * Then locate the root inode by scanning the directory keyspace
1239                  * represented by the label.
1240                  */
1241                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1242                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1243                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1244                                       &error, 0);
1245                 hammer2_chain_lookup_done(parent);
1246                 if (schain == NULL) {
1247                         kprintf("hammer2_mount: invalid super-root\n");
1248                         hammer2_unmount_helper(mp, NULL, hmp);
1249                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1250                         hammer2_vfs_unmount(mp, MNT_FORCE);
1251                         return EINVAL;
1252                 }
1253                 if (schain->error) {
1254                         kprintf("hammer2_mount: error %s reading super-root\n",
1255                                 hammer2_error_str(schain->error));
1256                         hammer2_chain_unlock(schain);
1257                         hammer2_chain_drop(schain);
1258                         schain = NULL;
1259                         hammer2_unmount_helper(mp, NULL, hmp);
1260                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1261                         hammer2_vfs_unmount(mp, MNT_FORCE);
1262                         return EINVAL;
1263                 }
1264
1265                 /*
1266                  * The super-root always uses an inode_tid of 1 when
1267                  * creating PFSs.
1268                  */
1269                 spmp->inode_tid = 1;
1270                 spmp->modify_tid = schain->bref.modify_tid + 1;
1271
1272                 /*
1273                  * Sanity-check schain's pmp and finish initialization.
1274                  * Any chain belonging to the super-root topology should
1275                  * have a NULL pmp (not even set to spmp).
1276                  */
1277                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1278                 KKASSERT(schain->pmp == NULL);
1279                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1280
1281                 /*
1282                  * Replace the dummy spmp->iroot with a real one.  It's
1283                  * easier to just do a wholesale replacement than to try
1284                  * to update the chain and fixup the iroot fields.
1285                  *
1286                  * The returned inode is locked with the supplied cluster.
1287                  */
1288                 hammer2_dummy_xop_from_chain(&xop, schain);
1289                 hammer2_inode_drop(spmp->iroot);
1290                 spmp->iroot = NULL;
1291                 spmp->iroot = hammer2_inode_get(spmp, NULL, &xop, -1);
1292                 spmp->spmp_hmp = hmp;
1293                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1294                 spmp->pfs_hmps[0] = hmp;
1295                 hammer2_inode_ref(spmp->iroot);
1296                 hammer2_inode_unlock(spmp->iroot);
1297                 hammer2_cluster_unlock(&xop.cluster);
1298                 hammer2_chain_drop(schain);
1299                 /* do not call hammer2_cluster_drop() on an embedded cluster */
1300                 schain = NULL;  /* now invalid */
1301                 /* leave spmp->iroot with one ref */
1302
1303                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1304                         error = hammer2_recovery(hmp);
1305                         if (error == 0)
1306                                 error |= hammer2_fixup_pfses(hmp);
1307                         /* XXX do something with error */
1308                 }
1309                 hammer2_update_pmps(hmp);
1310                 hammer2_iocom_init(hmp);
1311                 hammer2_bulkfree_init(hmp);
1312
1313                 /*
1314                  * Ref the cluster management messaging descriptor.  The mount
1315                  * program deals with the other end of the communications pipe.
1316                  *
1317                  * Root mounts typically do not supply one.
1318                  */
1319                 if (info.cluster_fd >= 0) {
1320                         fp = holdfp(curthread, info.cluster_fd, -1);
1321                         if (fp) {
1322                                 hammer2_cluster_reconnect(hmp, fp);
1323                         } else {
1324                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1325                         }
1326                 }
1327         } else {
1328                 spmp = hmp->spmp;
1329                 if (info.hflags & HMNT2_DEVFLAGS) {
1330                         kprintf("hammer2: Warning: mount flags pertaining "
1331                                 "to the whole device may only be specified "
1332                                 "on the first mount of the device: %08x\n",
1333                                 info.hflags & HMNT2_DEVFLAGS);
1334                 }
1335         }
1336
1337         /*
1338          * Force local mount (disassociate all PFSs from their clusters).
1339          * Used primarily for debugging.
1340          */
1341         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1342
1343         /*
1344          * Lookup the mount point under the media-localized super-root.
1345          * Scanning hammer2_pfslist doesn't help us because it represents
1346          * PFS cluster ids which can aggregate several named PFSs together.
1347          *
1348          * cluster->pmp will incorrectly point to spmp and must be fixed
1349          * up later on.
1350          */
1351         hammer2_inode_lock(spmp->iroot, 0);
1352         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1353         lhc = hammer2_dirhash(label, strlen(label));
1354         chain = hammer2_chain_lookup(&parent, &key_next,
1355                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1356                                      &error, 0);
1357         while (chain) {
1358                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1359                     strcmp(label, chain->data->ipdata.filename) == 0) {
1360                         break;
1361                 }
1362                 chain = hammer2_chain_next(&parent, chain, &key_next,
1363                                             key_next,
1364                                             lhc + HAMMER2_DIRHASH_LOMASK,
1365                                             &error, 0);
1366         }
1367         if (parent) {
1368                 hammer2_chain_unlock(parent);
1369                 hammer2_chain_drop(parent);
1370         }
1371         hammer2_inode_unlock(spmp->iroot);
1372
1373         /*
1374          * PFS could not be found?
1375          */
1376         if (chain == NULL) {
1377                 if (error)
1378                         kprintf("hammer2_mount: PFS label I/O error\n");
1379                 else
1380                         kprintf("hammer2_mount: PFS label not found\n");
1381                 hammer2_unmount_helper(mp, NULL, hmp);
1382                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1383                 hammer2_vfs_unmount(mp, MNT_FORCE);
1384
1385                 return EINVAL;
1386         }
1387
1388         /*
1389          * Acquire the pmp structure (it should have already been allocated
1390          * via hammer2_update_pmps() so do not pass cluster in to add to
1391          * available chains).
1392          *
1393          * Check if the cluster has already been mounted.  A cluster can
1394          * only be mounted once, use null mounts to mount additional copies.
1395          */
1396         if (chain->error) {
1397                 kprintf("hammer2_mount: PFS label I/O error\n");
1398         } else {
1399                 ripdata = &chain->data->ipdata;
1400                 bref = chain->bref;
1401                 pmp = hammer2_pfsalloc(NULL, ripdata,
1402                                        bref.modify_tid, force_local);
1403         }
1404         hammer2_chain_unlock(chain);
1405         hammer2_chain_drop(chain);
1406
1407         /*
1408          * Finish the mount
1409          */
1410         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1411
1412         if (pmp->mp) {
1413                 kprintf("hammer2_mount: PFS already mounted!\n");
1414                 hammer2_unmount_helper(mp, NULL, hmp);
1415                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1416                 hammer2_vfs_unmount(mp, MNT_FORCE);
1417
1418                 return EBUSY;
1419         }
1420
1421         pmp->hflags = info.hflags;
1422         mp->mnt_flag |= MNT_LOCAL;
1423         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1424         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1425
1426         /*
1427          * required mount structure initializations
1428          */
1429         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1430         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1431
1432         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1433         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1434
1435         /*
1436          * Optional fields
1437          */
1438         mp->mnt_iosize_max = MAXPHYS;
1439
1440         /*
1441          * Connect up mount pointers.
1442          */
1443         hammer2_mount_helper(mp, pmp);
1444
1445         lockmgr(&hammer2_mntlk, LK_RELEASE);
1446
1447         /*
1448          * Finish setup
1449          */
1450         vfs_getnewfsid(mp);
1451         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1452         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1453         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1454
1455         if (path) {
1456                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1457                           MNAMELEN - 1, &size);
1458                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1459         } /* else root mount, already in there */
1460
1461         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1462         if (path) {
1463                 copyinstr(path, mp->mnt_stat.f_mntonname,
1464                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1465                           &size);
1466         } else {
1467                 /* root mount */
1468                 mp->mnt_stat.f_mntonname[0] = '/';
1469         }
1470
1471         /*
1472          * Initial statfs to prime mnt_stat.
1473          */
1474         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1475
1476         return 0;
1477 }
1478
1479 /*
1480  * Scan PFSs under the super-root and create hammer2_pfs structures.
1481  */
1482 static
1483 void
1484 hammer2_update_pmps(hammer2_dev_t *hmp)
1485 {
1486         const hammer2_inode_data_t *ripdata;
1487         hammer2_chain_t *parent;
1488         hammer2_chain_t *chain;
1489         hammer2_blockref_t bref;
1490         hammer2_dev_t *force_local;
1491         hammer2_pfs_t *spmp;
1492         hammer2_pfs_t *pmp;
1493         hammer2_key_t key_next;
1494         int error;
1495
1496         /*
1497          * Force local mount (disassociate all PFSs from their clusters).
1498          * Used primarily for debugging.
1499          */
1500         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1501
1502         /*
1503          * Lookup mount point under the media-localized super-root.
1504          *
1505          * cluster->pmp will incorrectly point to spmp and must be fixed
1506          * up later on.
1507          */
1508         spmp = hmp->spmp;
1509         hammer2_inode_lock(spmp->iroot, 0);
1510         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1511         chain = hammer2_chain_lookup(&parent, &key_next,
1512                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1513                                          &error, 0);
1514         while (chain) {
1515                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1516                         continue;
1517                 if (chain->error) {
1518                         kprintf("I/O error scanning PFS labels\n");
1519                 } else {
1520                         ripdata = &chain->data->ipdata;
1521                         bref = chain->bref;
1522
1523                         pmp = hammer2_pfsalloc(chain, ripdata,
1524                                                bref.modify_tid, force_local);
1525                 }
1526                 chain = hammer2_chain_next(&parent, chain, &key_next,
1527                                            key_next, HAMMER2_KEY_MAX,
1528                                            &error, 0);
1529         }
1530         if (parent) {
1531                 hammer2_chain_unlock(parent);
1532                 hammer2_chain_drop(parent);
1533         }
1534         hammer2_inode_unlock(spmp->iroot);
1535 }
1536
1537 static
1538 int
1539 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1540                 struct vnode *devvp, struct ucred *cred)
1541 {
1542         int error;
1543
1544         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1545                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1546                 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1547                 vn_unlock(devvp);
1548                 error = hammer2_recovery(hmp);
1549                 if (error == 0)
1550                         error |= hammer2_fixup_pfses(hmp);
1551                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1552                 if (error == 0) {
1553                         VOP_CLOSE(devvp, FREAD, NULL);
1554                         hmp->ronly = 0;
1555                 } else {
1556                         VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1557                 }
1558                 vn_unlock(devvp);
1559         } else {
1560                 error = 0;
1561         }
1562         return error;
1563 }
1564
1565 static
1566 int
1567 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1568 {
1569         hammer2_pfs_t *pmp;
1570         int flags;
1571         int error = 0;
1572
1573         pmp = MPTOPMP(mp);
1574
1575         if (pmp == NULL)
1576                 return(0);
1577
1578         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1579
1580         /*
1581          * If mount initialization proceeded far enough we must flush
1582          * its vnodes and sync the underlying mount points.  Three syncs
1583          * are required to fully flush the filesystem (freemap updates lag
1584          * by one flush, and one extra for safety).
1585          */
1586         if (mntflags & MNT_FORCE)
1587                 flags = FORCECLOSE;
1588         else
1589                 flags = 0;
1590         if (pmp->iroot) {
1591                 error = vflush(mp, 0, flags);
1592                 if (error)
1593                         goto failed;
1594                 hammer2_vfs_sync(mp, MNT_WAIT);
1595                 hammer2_vfs_sync(mp, MNT_WAIT);
1596                 hammer2_vfs_sync(mp, MNT_WAIT);
1597         }
1598
1599         /*
1600          * Cleanup the frontend support XOPS threads
1601          */
1602         hammer2_xop_helper_cleanup(pmp);
1603
1604         if (pmp->mp)
1605                 hammer2_unmount_helper(mp, pmp, NULL);
1606
1607         error = 0;
1608 failed:
1609         lockmgr(&hammer2_mntlk, LK_RELEASE);
1610
1611         return (error);
1612 }
1613
1614 /*
1615  * Mount helper, hook the system mount into our PFS.
1616  * The mount lock is held.
1617  *
1618  * We must bump the mount_count on related devices for any
1619  * mounted PFSs.
1620  */
1621 static
1622 void
1623 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1624 {
1625         hammer2_cluster_t *cluster;
1626         hammer2_chain_t *rchain;
1627         int i;
1628
1629         mp->mnt_data = (qaddr_t)pmp;
1630         pmp->mp = mp;
1631
1632         /*
1633          * After pmp->mp is set we have to adjust hmp->mount_count.
1634          */
1635         cluster = &pmp->iroot->cluster;
1636         for (i = 0; i < cluster->nchains; ++i) {
1637                 rchain = cluster->array[i].chain;
1638                 if (rchain == NULL)
1639                         continue;
1640                 ++rchain->hmp->mount_count;
1641         }
1642
1643         /*
1644          * Create missing Xop threads
1645          */
1646         hammer2_xop_helper_create(pmp);
1647 }
1648
1649 /*
1650  * Mount helper, unhook the system mount from our PFS.
1651  * The mount lock is held.
1652  *
1653  * If hmp is supplied a mount responsible for being the first to open
1654  * the block device failed and the block device and all PFSs using the
1655  * block device must be cleaned up.
1656  *
1657  * If pmp is supplied multiple devices might be backing the PFS and each
1658  * must be disconnected.  This might not be the last PFS using some of the
1659  * underlying devices.  Also, we have to adjust our hmp->mount_count
1660  * accounting for the devices backing the pmp which is now undergoing an
1661  * unmount.
1662  */
1663 static
1664 void
1665 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1666 {
1667         hammer2_cluster_t *cluster;
1668         hammer2_chain_t *rchain;
1669         struct vnode *devvp;
1670         int dumpcnt;
1671         int ronly;
1672         int i;
1673
1674         /*
1675          * If no device supplied this is a high-level unmount and we have to
1676          * to disconnect the mount, adjust mount_count, and locate devices
1677          * that might now have no mounts.
1678          */
1679         if (pmp) {
1680                 KKASSERT(hmp == NULL);
1681                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1682                 pmp->mp = NULL;
1683                 mp->mnt_data = NULL;
1684
1685                 /*
1686                  * After pmp->mp is cleared we have to account for
1687                  * mount_count.
1688                  */
1689                 cluster = &pmp->iroot->cluster;
1690                 for (i = 0; i < cluster->nchains; ++i) {
1691                         rchain = cluster->array[i].chain;
1692                         if (rchain == NULL)
1693                                 continue;
1694                         --rchain->hmp->mount_count;
1695                         /* scrapping hmp now may invalidate the pmp */
1696                 }
1697 again:
1698                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1699                         if (hmp->mount_count == 0) {
1700                                 hammer2_unmount_helper(NULL, NULL, hmp);
1701                                 goto again;
1702                         }
1703                 }
1704                 return;
1705         }
1706
1707         /*
1708          * Try to terminate the block device.  We can't terminate it if
1709          * there are still PFSs referencing it.
1710          */
1711         if (hmp->mount_count)
1712                 return;
1713
1714         /*
1715          * Decomission the network before we start messing with the
1716          * device and PFS.
1717          */
1718         hammer2_iocom_uninit(hmp);
1719
1720         hammer2_bulkfree_uninit(hmp);
1721         hammer2_pfsfree_scan(hmp, 0);
1722         hammer2_dev_exlock(hmp);        /* XXX order */
1723
1724         /*
1725          * Cycle the volume data lock as a safety (probably not needed any
1726          * more).  To ensure everything is out we need to flush at least
1727          * three times.  (1) The running of the sideq can dirty the
1728          * filesystem, (2) A normal flush can dirty the freemap, and
1729          * (3) ensure that the freemap is fully synchronized.
1730          *
1731          * The next mount's recovery scan can clean everything up but we want
1732          * to leave the filesystem in a 100% clean state on a normal unmount.
1733          */
1734 #if 0
1735         hammer2_voldata_lock(hmp);
1736         hammer2_voldata_unlock(hmp);
1737 #endif
1738
1739         /*
1740          * Flush whatever is left.  Unmounted but modified PFS's might still
1741          * have some dirty chains on them.
1742          */
1743         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1744         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1745
1746         if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1747                 hammer2_voldata_modify(hmp);
1748                 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1749                                             HAMMER2_FLUSH_ALL);
1750         }
1751         hammer2_chain_unlock(&hmp->fchain);
1752
1753         if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1754                 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1755                                             HAMMER2_FLUSH_ALL);
1756         }
1757         hammer2_chain_unlock(&hmp->vchain);
1758
1759         if ((hmp->vchain.flags | hmp->fchain.flags) &
1760             HAMMER2_CHAIN_FLUSH_MASK) {
1761                 kprintf("hammer2_unmount: chains left over "
1762                         "after final sync\n");
1763                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1764                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1765
1766                 if (hammer2_debug & 0x0010)
1767                         Debugger("entered debugger");
1768         }
1769
1770         hammer2_pfsfree_scan(hmp, 1);
1771
1772         KKASSERT(hmp->spmp == NULL);
1773
1774         /*
1775          * Finish up with the device vnode
1776          */
1777         if ((devvp = hmp->devvp) != NULL) {
1778                 ronly = hmp->ronly;
1779                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1780                 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1781                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1782                         ronly);
1783                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1784                 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1785                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1786                 hmp->devvp = NULL;
1787                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1788                 vn_unlock(devvp);
1789                 vrele(devvp);
1790                 devvp = NULL;
1791         }
1792
1793         /*
1794          * Clear vchain/fchain flags that might prevent final cleanup
1795          * of these chains.
1796          */
1797         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1798                 atomic_add_long(&hammer2_count_modified_chains, -1);
1799                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1800                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1801         }
1802         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1803                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1804         }
1805
1806         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1807                 atomic_add_long(&hammer2_count_modified_chains, -1);
1808                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1809                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1810         }
1811         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1812                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1813         }
1814
1815         /*
1816          * Final drop of embedded freemap root chain to
1817          * clean up fchain.core (fchain structure is not
1818          * flagged ALLOCATED so it is cleaned out and then
1819          * left to rot).
1820          */
1821         hammer2_chain_drop(&hmp->fchain);
1822
1823         /*
1824          * Final drop of embedded volume root chain to clean
1825          * up vchain.core (vchain structure is not flagged
1826          * ALLOCATED so it is cleaned out and then left to
1827          * rot).
1828          */
1829         dumpcnt = 50;
1830         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1);
1831         dumpcnt = 50;
1832         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1);
1833         hammer2_dev_unlock(hmp);
1834         hammer2_chain_drop(&hmp->vchain);
1835
1836         hammer2_io_cleanup(hmp, &hmp->iotree);
1837         if (hmp->iofree_count) {
1838                 kprintf("io_cleanup: %d I/O's left hanging\n",
1839                         hmp->iofree_count);
1840         }
1841
1842         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1843         kmalloc_destroy(&hmp->mchain);
1844         kfree(hmp, M_HAMMER2);
1845 }
1846
1847 int
1848 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1849                  ino_t ino, struct vnode **vpp)
1850 {
1851         hammer2_xop_lookup_t *xop;
1852         hammer2_pfs_t *pmp;
1853         hammer2_inode_t *ip;
1854         hammer2_tid_t inum;
1855         int error;
1856
1857         inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1858
1859         error = 0;
1860         pmp = MPTOPMP(mp);
1861
1862         /*
1863          * Easy if we already have it cached
1864          */
1865         ip = hammer2_inode_lookup(pmp, inum);
1866         if (ip) {
1867                 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1868                 *vpp = hammer2_igetv(ip, &error);
1869                 hammer2_inode_unlock(ip);
1870                 hammer2_inode_drop(ip);         /* from lookup */
1871
1872                 return error;
1873         }
1874
1875         /*
1876          * Otherwise we have to find the inode
1877          */
1878         xop = hammer2_xop_alloc(pmp->iroot, 0);
1879         xop->lhc = inum;
1880         hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1881         error = hammer2_xop_collect(&xop->head, 0);
1882
1883         if (error == 0)
1884                 ip = hammer2_inode_get(pmp, NULL, &xop->head, -1);
1885         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1886
1887         if (ip) {
1888                 *vpp = hammer2_igetv(ip, &error);
1889                 hammer2_inode_unlock(ip);
1890         } else {
1891                 *vpp = NULL;
1892                 error = ENOENT;
1893         }
1894         return (error);
1895 }
1896
1897 static
1898 int
1899 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1900 {
1901         hammer2_pfs_t *pmp;
1902         struct vnode *vp;
1903         int error;
1904
1905         pmp = MPTOPMP(mp);
1906         if (pmp->iroot == NULL) {
1907                 kprintf("hammer2 (%s): no root inode\n",
1908                         mp->mnt_stat.f_mntfromname);
1909                 *vpp = NULL;
1910                 return EINVAL;
1911         }
1912
1913         error = 0;
1914         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1915
1916         while (pmp->inode_tid == 0) {
1917                 hammer2_xop_ipcluster_t *xop;
1918                 const hammer2_inode_meta_t *meta;
1919
1920                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1921                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1922                 error = hammer2_xop_collect(&xop->head, 0);
1923
1924                 if (error == 0) {
1925                         meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta;
1926                         pmp->iroot->meta = *meta;
1927                         pmp->inode_tid = meta->pfs_inum + 1;
1928                         hammer2_xop_pdata(&xop->head);
1929                         /* meta invalid */
1930
1931                         if (pmp->inode_tid < HAMMER2_INODE_START)
1932                                 pmp->inode_tid = HAMMER2_INODE_START;
1933                         pmp->modify_tid =
1934                                 xop->head.cluster.focus->bref.modify_tid + 1;
1935 #if 0
1936                         kprintf("PFS: Starting inode %jd\n",
1937                                 (intmax_t)pmp->inode_tid);
1938                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1939                                 pmp->inode_tid, pmp->modify_tid);
1940 #endif
1941                         wakeup(&pmp->iroot);
1942
1943                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1944
1945                         /*
1946                          * Prime the mount info.
1947                          */
1948                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1949                         break;
1950                 }
1951
1952                 /*
1953                  * Loop, try again
1954                  */
1955                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1956                 hammer2_inode_unlock(pmp->iroot);
1957                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1958                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1959                 if (error == EINTR)
1960                         break;
1961         }
1962
1963         if (error) {
1964                 hammer2_inode_unlock(pmp->iroot);
1965                 *vpp = NULL;
1966         } else {
1967                 vp = hammer2_igetv(pmp->iroot, &error);
1968                 hammer2_inode_unlock(pmp->iroot);
1969                 *vpp = vp;
1970         }
1971
1972         return (error);
1973 }
1974
1975 /*
1976  * Filesystem status
1977  *
1978  * XXX incorporate ipdata->meta.inode_quota and data_quota
1979  */
1980 static
1981 int
1982 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1983 {
1984         hammer2_pfs_t *pmp;
1985         hammer2_dev_t *hmp;
1986         hammer2_blockref_t bref;
1987         struct statfs tmp;
1988         int i;
1989
1990         /*
1991          * NOTE: iroot might not have validated the cluster yet.
1992          */
1993         pmp = MPTOPMP(mp);
1994
1995         bzero(&tmp, sizeof(tmp));
1996
1997         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1998                 hmp = pmp->pfs_hmps[i];
1999                 if (hmp == NULL)
2000                         continue;
2001                 if (pmp->iroot->cluster.array[i].chain)
2002                         bref = pmp->iroot->cluster.array[i].chain->bref;
2003                 else
2004                         bzero(&bref, sizeof(bref));
2005
2006                 tmp.f_files = bref.embed.stats.inode_count;
2007                 tmp.f_ffree = 0;
2008                 tmp.f_blocks = hmp->voldata.allocator_size /
2009                                mp->mnt_vstat.f_bsize;
2010                 tmp.f_bfree = hmp->voldata.allocator_free /
2011                               mp->mnt_vstat.f_bsize;
2012                 tmp.f_bavail = tmp.f_bfree;
2013
2014                 if (cred && cred->cr_uid != 0) {
2015                         uint64_t adj;
2016
2017                         /* 5% */
2018                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2019                         tmp.f_blocks -= adj;
2020                         tmp.f_bfree -= adj;
2021                         tmp.f_bavail -= adj;
2022                 }
2023
2024                 mp->mnt_stat.f_blocks = tmp.f_blocks;
2025                 mp->mnt_stat.f_bfree = tmp.f_bfree;
2026                 mp->mnt_stat.f_bavail = tmp.f_bavail;
2027                 mp->mnt_stat.f_files = tmp.f_files;
2028                 mp->mnt_stat.f_ffree = tmp.f_ffree;
2029
2030                 *sbp = mp->mnt_stat;
2031         }
2032         return (0);
2033 }
2034
2035 static
2036 int
2037 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2038 {
2039         hammer2_pfs_t *pmp;
2040         hammer2_dev_t *hmp;
2041         hammer2_blockref_t bref;
2042         struct statvfs tmp;
2043         int i;
2044
2045         /*
2046          * NOTE: iroot might not have validated the cluster yet.
2047          */
2048         pmp = MPTOPMP(mp);
2049         bzero(&tmp, sizeof(tmp));
2050
2051         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2052                 hmp = pmp->pfs_hmps[i];
2053                 if (hmp == NULL)
2054                         continue;
2055                 if (pmp->iroot->cluster.array[i].chain)
2056                         bref = pmp->iroot->cluster.array[i].chain->bref;
2057                 else
2058                         bzero(&bref, sizeof(bref));
2059
2060                 tmp.f_files = bref.embed.stats.inode_count;
2061                 tmp.f_ffree = 0;
2062                 tmp.f_blocks = hmp->voldata.allocator_size /
2063                                mp->mnt_vstat.f_bsize;
2064                 tmp.f_bfree = hmp->voldata.allocator_free /
2065                               mp->mnt_vstat.f_bsize;
2066                 tmp.f_bavail = tmp.f_bfree;
2067
2068                 if (cred && cred->cr_uid != 0) {
2069                         uint64_t adj;
2070
2071                         /* 5% */
2072                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2073                         tmp.f_blocks -= adj;
2074                         tmp.f_bfree -= adj;
2075                         tmp.f_bavail -= adj;
2076                 }
2077
2078                 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2079                 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2080                 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2081                 mp->mnt_vstat.f_files = tmp.f_files;
2082                 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2083
2084                 *sbp = mp->mnt_vstat;
2085         }
2086         return (0);
2087 }
2088
2089 /*
2090  * Mount-time recovery (RW mounts)
2091  *
2092  * Updates to the free block table are allowed to lag flushes by one
2093  * transaction.  In case of a crash, then on a fresh mount we must do an
2094  * incremental scan of the last committed transaction id and make sure that
2095  * all related blocks have been marked allocated.
2096  *
2097  * The super-root topology and each PFS has its own transaction id domain,
2098  * so we must track PFS boundary transitions.
2099  */
2100 struct hammer2_recovery_elm {
2101         TAILQ_ENTRY(hammer2_recovery_elm) entry;
2102         hammer2_chain_t *chain;
2103         hammer2_tid_t sync_tid;
2104 };
2105
2106 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2107
2108 struct hammer2_recovery_info {
2109         struct hammer2_recovery_list list;
2110         hammer2_tid_t   mtid;
2111         int     depth;
2112 };
2113
2114 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2115                         hammer2_chain_t *parent,
2116                         struct hammer2_recovery_info *info,
2117                         hammer2_tid_t sync_tid);
2118
2119 #define HAMMER2_RECOVERY_MAXDEPTH       10
2120
2121 static
2122 int
2123 hammer2_recovery(hammer2_dev_t *hmp)
2124 {
2125         struct hammer2_recovery_info info;
2126         struct hammer2_recovery_elm *elm;
2127         hammer2_chain_t *parent;
2128         hammer2_tid_t sync_tid;
2129         hammer2_tid_t mirror_tid;
2130         int error;
2131
2132         hammer2_trans_init(hmp->spmp, 0);
2133
2134         sync_tid = hmp->voldata.freemap_tid;
2135         mirror_tid = hmp->voldata.mirror_tid;
2136
2137         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2138         if (sync_tid >= mirror_tid) {
2139                 kprintf(" no recovery needed\n");
2140         } else {
2141                 kprintf(" freemap recovery %016jx-%016jx\n",
2142                         sync_tid + 1, mirror_tid);
2143         }
2144
2145         TAILQ_INIT(&info.list);
2146         info.depth = 0;
2147         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2148         error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2149         hammer2_chain_lookup_done(parent);
2150
2151         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2152                 TAILQ_REMOVE(&info.list, elm, entry);
2153                 parent = elm->chain;
2154                 sync_tid = elm->sync_tid;
2155                 kfree(elm, M_HAMMER2);
2156
2157                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2158                 error |= hammer2_recovery_scan(hmp, parent, &info,
2159                                               hmp->voldata.freemap_tid);
2160                 hammer2_chain_unlock(parent);
2161                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
2162         }
2163
2164         hammer2_trans_done(hmp->spmp, 0);
2165
2166         return error;
2167 }
2168
2169 static
2170 int
2171 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2172                       struct hammer2_recovery_info *info,
2173                       hammer2_tid_t sync_tid)
2174 {
2175         const hammer2_inode_data_t *ripdata;
2176         hammer2_chain_t *chain;
2177         hammer2_blockref_t bref;
2178         int tmp_error;
2179         int rup_error;
2180         int error;
2181         int first;
2182
2183         /*
2184          * Adjust freemap to ensure that the block(s) are marked allocated.
2185          */
2186         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2187                 hammer2_freemap_adjust(hmp, &parent->bref,
2188                                        HAMMER2_FREEMAP_DORECOVER);
2189         }
2190
2191         /*
2192          * Check type for recursive scan
2193          */
2194         switch(parent->bref.type) {
2195         case HAMMER2_BREF_TYPE_VOLUME:
2196                 /* data already instantiated */
2197                 break;
2198         case HAMMER2_BREF_TYPE_INODE:
2199                 /*
2200                  * Must instantiate data for DIRECTDATA test and also
2201                  * for recursion.
2202                  */
2203                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2204                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2205                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2206                         /* not applicable to recovery scan */
2207                         hammer2_chain_unlock(parent);
2208                         return 0;
2209                 }
2210                 hammer2_chain_unlock(parent);
2211                 break;
2212         case HAMMER2_BREF_TYPE_INDIRECT:
2213                 /*
2214                  * Must instantiate data for recursion
2215                  */
2216                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2217                 hammer2_chain_unlock(parent);
2218                 break;
2219         case HAMMER2_BREF_TYPE_DIRENT:
2220         case HAMMER2_BREF_TYPE_DATA:
2221         case HAMMER2_BREF_TYPE_FREEMAP:
2222         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2223         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2224                 /* not applicable to recovery scan */
2225                 return 0;
2226                 break;
2227         default:
2228                 return HAMMER2_ERROR_BADBREF;
2229         }
2230
2231         /*
2232          * Defer operation if depth limit reached or if we are crossing a
2233          * PFS boundary.
2234          */
2235         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2236                 struct hammer2_recovery_elm *elm;
2237
2238                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2239                 elm->chain = parent;
2240                 elm->sync_tid = sync_tid;
2241                 hammer2_chain_ref(parent);
2242                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2243                 /* unlocked by caller */
2244
2245                 return(0);
2246         }
2247
2248
2249         /*
2250          * Recursive scan of the last flushed transaction only.  We are
2251          * doing this without pmp assignments so don't leave the chains
2252          * hanging around after we are done with them.
2253          *
2254          * error        Cumulative error this level only
2255          * rup_error    Cumulative error for recursion
2256          * tmp_error    Specific non-cumulative recursion error
2257          */
2258         chain = NULL;
2259         first = 1;
2260         rup_error = 0;
2261         error = 0;
2262
2263         for (;;) {
2264                 error |= hammer2_chain_scan(parent, &chain, &bref,
2265                                             &first,
2266                                             HAMMER2_LOOKUP_NODATA);
2267
2268                 /*
2269                  * Problem during scan or EOF
2270                  */
2271                 if (error)
2272                         break;
2273
2274                 /*
2275                  * If this is a leaf
2276                  */
2277                 if (chain == NULL) {
2278                         if (bref.mirror_tid > sync_tid) {
2279                                 hammer2_freemap_adjust(hmp, &bref,
2280                                                      HAMMER2_FREEMAP_DORECOVER);
2281                         }
2282                         continue;
2283                 }
2284
2285                 /*
2286                  * This may or may not be a recursive node.
2287                  */
2288                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2289                 if (bref.mirror_tid > sync_tid) {
2290                         ++info->depth;
2291                         tmp_error = hammer2_recovery_scan(hmp, chain,
2292                                                            info, sync_tid);
2293                         --info->depth;
2294                 } else {
2295                         tmp_error = 0;
2296                 }
2297
2298                 /*
2299                  * Flush the recovery at the PFS boundary to stage it for
2300                  * the final flush of the super-root topology.
2301                  */
2302                 if (tmp_error == 0 &&
2303                     (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2304                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2305                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2306                                              HAMMER2_FLUSH_ALL);
2307                 }
2308                 rup_error |= tmp_error;
2309         }
2310         return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2311 }
2312
2313 /*
2314  * This fixes up an error introduced in earlier H2 implementations where
2315  * moving a PFS inode into an indirect block wound up causing the
2316  * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2317  */
2318 static
2319 int
2320 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2321 {
2322         const hammer2_inode_data_t *ripdata;
2323         hammer2_chain_t *parent;
2324         hammer2_chain_t *chain;
2325         hammer2_key_t key_next;
2326         hammer2_pfs_t *spmp;
2327         int error;
2328
2329         error = 0;
2330
2331         /*
2332          * Lookup mount point under the media-localized super-root.
2333          *
2334          * cluster->pmp will incorrectly point to spmp and must be fixed
2335          * up later on.
2336          */
2337         spmp = hmp->spmp;
2338         hammer2_inode_lock(spmp->iroot, 0);
2339         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2340         chain = hammer2_chain_lookup(&parent, &key_next,
2341                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2342                                          &error, 0);
2343         while (chain) {
2344                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2345                         continue;
2346                 if (chain->error) {
2347                         kprintf("I/O error scanning PFS labels\n");
2348                         error |= chain->error;
2349                 } else if ((chain->bref.flags &
2350                             HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2351                         int error2;
2352
2353                         ripdata = &chain->data->ipdata;
2354                         hammer2_trans_init(hmp->spmp, 0);
2355                         error2 = hammer2_chain_modify(chain,
2356                                                       chain->bref.modify_tid,
2357                                                       0, 0);
2358                         if (error2 == 0) {
2359                                 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2360                                         ripdata->filename);
2361                                 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2362                         } else {
2363                                 error |= error2;
2364                         }
2365                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2366                                              HAMMER2_FLUSH_ALL);
2367                         hammer2_trans_done(hmp->spmp, 0);
2368                 }
2369                 chain = hammer2_chain_next(&parent, chain, &key_next,
2370                                            key_next, HAMMER2_KEY_MAX,
2371                                            &error, 0);
2372         }
2373         if (parent) {
2374                 hammer2_chain_unlock(parent);
2375                 hammer2_chain_drop(parent);
2376         }
2377         hammer2_inode_unlock(spmp->iroot);
2378
2379         return error;
2380 }
2381
2382 /*
2383  * Sync a mount point; this is called periodically on a per-mount basis from
2384  * the filesystem syncer, and whenever a user issues a sync.
2385  */
2386 int
2387 hammer2_vfs_sync(struct mount *mp, int waitfor)
2388 {
2389         hammer2_xop_flush_t *xop;
2390         struct hammer2_sync_info info;
2391         hammer2_inode_t *iroot;
2392         hammer2_pfs_t *pmp;
2393         int flags;
2394         int error;
2395
2396         pmp = MPTOPMP(mp);
2397         iroot = pmp->iroot;
2398         KKASSERT(iroot);
2399         KKASSERT(iroot->pmp == pmp);
2400
2401         /*
2402          * We can't acquire locks on existing vnodes while in a transaction
2403          * without risking a deadlock.  This assumes that vfsync() can be
2404          * called without the vnode locked (which it can in DragonFly).
2405          * Otherwise we'd have to implement a multi-pass or flag the lock
2406          * failures and retry.
2407          *
2408          * The reclamation code interlocks with the sync list's token
2409          * (by removing the vnode from the scan list) before unlocking
2410          * the inode, giving us time to ref the inode.
2411          */
2412         /*flags = VMSC_GETVP;*/
2413         flags = 0;
2414         if (waitfor & MNT_LAZY)
2415                 flags |= VMSC_ONEPASS;
2416
2417         /*
2418          * Flush vnodes individually using a normal transaction to avoid
2419          * stalling any concurrent operations.  This will flush the related
2420          * buffer cache buffers and inodes to the media.
2421          *
2422          * For efficiency do an async pass before making sure with a
2423          * synchronous pass on all related buffer cache buffers.
2424          */
2425         hammer2_trans_init(pmp, 0);
2426
2427         info.error = 0;
2428
2429         info.waitfor = MNT_NOWAIT;
2430         info.pass = 1;
2431         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2432
2433         /*
2434          * Now do two passes making sure we get everything.  The first pass
2435          * vfsync()s dirty vnodes.  The second pass waits for their I/O's
2436          * to finish and cleans up the dirty flag on the vnode.
2437          */
2438         info.pass = 1;
2439         info.waitfor = MNT_WAIT;
2440         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2441
2442         info.pass = 2;
2443         info.waitfor = MNT_WAIT;
2444         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2445
2446         /*
2447          * We must also run the sideq to handle any disconnected inodes
2448          * as the vnode scan will not see these.
2449          */
2450         hammer2_inode_run_sideq(pmp, 1);
2451         hammer2_trans_done(pmp, 0);
2452
2453         /*
2454          * Start our flush transaction and flush the root topology down to
2455          * the inodes, but not the inodes themselves (which we already flushed
2456          * above).  Any concurrent activity effecting inode contents will not
2457          *
2458          * The flush sequence will
2459          *
2460          * NOTE! It is still possible for the paging code to push pages
2461          *       out via a UIO_NOCOPY hammer2_vop_write() during the main
2462          *       flush.
2463          */
2464         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2465
2466         /*
2467          * sync dirty vnodes again while in the flush transaction.  This is
2468          * currently an expensive shim to makre sure the logical topology is
2469          * completely consistent before we flush the volume header.
2470          */
2471         info.pass = 1;
2472         info.waitfor = MNT_WAIT;
2473         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2474
2475         info.pass = 2;
2476         info.waitfor = MNT_WAIT;
2477         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2478
2479         /*
2480          * Use the XOP interface to concurrently flush all nodes to
2481          * synchronize the PFSROOT subtopology to the media.  A standard
2482          * end-of-scan ENOENT error indicates cluster sufficiency.
2483          *
2484          * Note that this flush will not be visible on crash recovery until
2485          * we flush the super-root topology in the next loop.
2486          *
2487          * XXX For now wait for all flushes to complete.
2488          */
2489         if (iroot) {
2490                 /*
2491                  * If unmounting try to flush everything including any
2492                  * sub-trees under inodes, just in case there is dangling
2493                  * modified data, as a safety.  Otherwise just flush up to
2494                  * the inodes in this stage.
2495                  */
2496                 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
2497                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2498                                                        HAMMER2_XOP_VOLHDR);
2499                 } else {
2500                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2501                                                        HAMMER2_XOP_INODE_STOP |
2502                                                        HAMMER2_XOP_VOLHDR);
2503                 }
2504                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2505                 error = hammer2_xop_collect(&xop->head,
2506                                             HAMMER2_XOP_COLLECT_WAITALL);
2507                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2508                 if (error == HAMMER2_ERROR_ENOENT)
2509                         error = 0;
2510                 else
2511                         error = hammer2_error_to_errno(error);
2512         } else {
2513                 error = 0;
2514         }
2515         hammer2_trans_done(pmp, 0);
2516
2517         return (error);
2518 }
2519
2520 /*
2521  * Sync passes.
2522  *
2523  * Note that we ignore the tranasction mtid we got above.  Instead,
2524  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2525  * transactions.
2526  *
2527  * WARNING! The frontend might be waiting on chnmem (limit_dirty_chains)
2528  * while holding a vnode locked.  When this situation occurs we cannot
2529  * safely test whether it is ok to clear the dirty bit on the vnode.
2530  * However, we can still flush the inode's topology.
2531  */
2532 static int
2533 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2534 {
2535         struct hammer2_sync_info *info = data;
2536         hammer2_inode_t *ip;
2537         int error;
2538
2539         /*
2540          * Degenerate cases.  Note that ip == NULL typically means the
2541          * syncer vnode itself and we don't want to vclrisdirty() in that
2542          * situation.
2543          */
2544         ip = VTOI(vp);
2545         if (ip == NULL) {
2546                 return(0);
2547         }
2548         if (vp->v_type == VNON || vp->v_type == VBAD) {
2549                 vclrisdirty(vp);
2550                 return(0);
2551         }
2552
2553         /*
2554          * Synchronize the buffer cche and inode meta-data to the backing
2555          * chain topology.
2556          *
2557          * vfsync is not necessarily synchronous, so it is best NOT to try
2558          * to flush the backing topology to media at this point.
2559          */
2560         hammer2_inode_ref(ip);
2561         if ((ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) ||
2562             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2563                 if (info->pass == 1)
2564                         vfsync(vp, info->waitfor, 1, NULL, NULL);
2565                 else
2566                         bio_track_wait(&vp->v_track_write, 0, 0);
2567         }
2568         if (info->pass == 2 && (vp->v_flag & VISDIRTY)) {
2569                 /*
2570                  * v_token is needed to interlock v_rbdirty_tree.
2571                  */
2572                 lwkt_gettoken(&vp->v_token);
2573                 hammer2_inode_lock(ip, 0);
2574                 hammer2_inode_chain_sync(ip);
2575                 hammer2_inode_chain_flush(ip);
2576                 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2577                                   HAMMER2_INODE_RESIZED |
2578                                   HAMMER2_INODE_DIRTYDATA)) == 0 &&
2579                     RB_EMPTY(&vp->v_rbdirty_tree) &&
2580                     !bio_track_active(&vp->v_track_write)) {
2581                         vclrisdirty(vp);
2582                 }
2583                 hammer2_inode_unlock(ip);
2584                 lwkt_reltoken(&vp->v_token);
2585         }
2586         hammer2_inode_drop(ip);
2587 #if 1
2588         error = 0;
2589         if (error)
2590                 info->error = error;
2591 #endif
2592         return(0);
2593 }
2594
2595 static
2596 int
2597 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2598 {
2599         hammer2_inode_t *ip;
2600
2601         KKASSERT(MAXFIDSZ >= 16);
2602         ip = VTOI(vp);
2603         fhp->fid_len = offsetof(struct fid, fid_data[16]);
2604         fhp->fid_ext = 0;
2605         ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2606         ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2607
2608         return 0;
2609 }
2610
2611 static
2612 int
2613 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2614                struct fid *fhp, struct vnode **vpp)
2615 {
2616         hammer2_pfs_t *pmp;
2617         hammer2_tid_t inum;
2618         int error;
2619
2620         pmp = MPTOPMP(mp);
2621         inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2622         if (vpp) {
2623                 if (inum == 1)
2624                         error = hammer2_vfs_root(mp, vpp);
2625                 else
2626                         error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2627         } else {
2628                 error = 0;
2629         }
2630         if (error)
2631                 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2632         return error;
2633 }
2634
2635 static
2636 int
2637 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2638                  int *exflagsp, struct ucred **credanonp)
2639 {
2640         hammer2_pfs_t *pmp;
2641         struct netcred *np;
2642         int error;
2643
2644         pmp = MPTOPMP(mp);
2645         np = vfs_export_lookup(mp, &pmp->export, nam);
2646         if (np) {
2647                 *exflagsp = np->netc_exflags;
2648                 *credanonp = &np->netc_anon;
2649                 error = 0;
2650         } else {
2651                 error = EACCES;
2652         }
2653         return error;
2654 }
2655
2656 /*
2657  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2658  * header into the HMP
2659  *
2660  * XXX read four volhdrs and use the one with the highest TID whos CRC
2661  *     matches.
2662  *
2663  * XXX check iCRCs.
2664  *
2665  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2666  *     nonexistant locations.
2667  *
2668  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2669  */
2670 static
2671 int
2672 hammer2_install_volume_header(hammer2_dev_t *hmp)
2673 {
2674         hammer2_volume_data_t *vd;
2675         struct buf *bp;
2676         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2677         int error_reported;
2678         int error;
2679         int valid;
2680         int i;
2681
2682         error_reported = 0;
2683         error = 0;
2684         valid = 0;
2685         bp = NULL;
2686
2687         /*
2688          * There are up to 4 copies of the volume header (syncs iterate
2689          * between them so there is no single master).  We don't trust the
2690          * volu_size field so we don't know precisely how large the filesystem
2691          * is, so depend on the OS to return an error if we go beyond the
2692          * block device's EOF.
2693          */
2694         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2695                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2696                               HAMMER2_VOLUME_BYTES, &bp);
2697                 if (error) {
2698                         brelse(bp);
2699                         bp = NULL;
2700                         continue;
2701                 }
2702
2703                 vd = (struct hammer2_volume_data *) bp->b_data;
2704                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2705                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2706                         brelse(bp);
2707                         bp = NULL;
2708                         continue;
2709                 }
2710
2711                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2712                         /* XXX: Reversed-endianness filesystem */
2713                         kprintf("hammer2: reverse-endian filesystem detected");
2714                         brelse(bp);
2715                         bp = NULL;
2716                         continue;
2717                 }
2718
2719                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2720                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2721                                       HAMMER2_VOLUME_ICRC0_SIZE);
2722                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2723                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2724                                        HAMMER2_VOLUME_ICRC1_SIZE);
2725                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2726                         kprintf("hammer2 volume header crc "
2727                                 "mismatch copy #%d %08x/%08x\n",
2728                                 i, crc0, crc);
2729                         error_reported = 1;
2730                         brelse(bp);
2731                         bp = NULL;
2732                         continue;
2733                 }
2734                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2735                         valid = 1;
2736                         hmp->voldata = *vd;
2737                         hmp->volhdrno = i;
2738                 }
2739                 brelse(bp);
2740                 bp = NULL;
2741         }
2742         if (valid) {
2743                 hmp->volsync = hmp->voldata;
2744                 hmp->free_reserved = hmp->voldata.allocator_size / 20;
2745                 error = 0;
2746                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2747                         kprintf("hammer2: using volume header #%d\n",
2748                                 hmp->volhdrno);
2749                 }
2750         } else {
2751                 error = EINVAL;
2752                 kprintf("hammer2: no valid volume headers found!\n");
2753         }
2754         return (error);
2755 }
2756
2757 /*
2758  * This handles hysteresis on regular file flushes.  Because the BIOs are
2759  * routed to a thread it is possible for an excessive number to build up
2760  * and cause long front-end stalls long before the runningbuffspace limit
2761  * is hit, so we implement hammer2_flush_pipe to control the
2762  * hysteresis.
2763  *
2764  * This is a particular problem when compression is used.
2765  */
2766 void
2767 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2768 {
2769         atomic_add_int(&pmp->count_lwinprog, 1);
2770 }
2771
2772 void
2773 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2774 {
2775         int lwinprog;
2776
2777         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2778         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2779             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2780                 atomic_clear_int(&pmp->count_lwinprog,
2781                                  HAMMER2_LWINPROG_WAITING);
2782                 wakeup(&pmp->count_lwinprog);
2783         }
2784         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2785             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2786                 atomic_clear_int(&pmp->count_lwinprog,
2787                                  HAMMER2_LWINPROG_WAITING0);
2788                 wakeup(&pmp->count_lwinprog);
2789         }
2790 }
2791
2792 void
2793 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2794 {
2795         int lwinprog;
2796         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2797                                     HAMMER2_LWINPROG_WAITING0;
2798
2799         for (;;) {
2800                 lwinprog = pmp->count_lwinprog;
2801                 cpu_ccfence();
2802                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2803                         break;
2804                 tsleep_interlock(&pmp->count_lwinprog, 0);
2805                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2806                 lwinprog = pmp->count_lwinprog;
2807                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2808                         break;
2809                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2810         }
2811 }
2812
2813 /*
2814  * Attempt to proactively fsync dirty vnodes if we have too many.  This
2815  * solves an issue where the kernel syncer thread can get seriously behind
2816  * when multiple user processes/threads are furiously modifying inodes.
2817  * This situation can occur on slow storage and is only limited by
2818  * kern.maxvnodes without the moderation code below.  It is made worse
2819  * when the device buffers underlying the modified inodes (which are clean)
2820  * get evicted before the flush can occur, forcing a re-read.
2821  *
2822  * We do not want sysads to feel that they have to torpedo kern.maxvnodes
2823  * to solve this problem, so we implement vfs.hammer2.limit_dirty_inodes
2824  * (per-mount-basis) and default it to something reasonable.
2825  */
2826 static void
2827 hammer2_pfs_moderate(hammer2_inode_t *ip, int always_moderate)
2828 {
2829         hammer2_pfs_t *pmp = ip->pmp;
2830         struct mount *mp = pmp->mp;
2831
2832         if (mp && vn_syncer_count(mp) > hammer2_limit_dirty_inodes) {
2833                 vn_syncer_one(mp);
2834         }
2835 }
2836
2837 /*
2838  * Manage excessive memory resource use for chain and related
2839  * structures.
2840  *
2841  * Called without any inode locks or transaction locks.  VNodes
2842  * might be locked by the kernel in the call stack.
2843  */
2844 void
2845 hammer2_pfs_memory_wait(hammer2_inode_t *ip, int always_moderate)
2846 {
2847         hammer2_pfs_t *pmp = ip->pmp;
2848         uint32_t waiting;
2849         uint32_t count;
2850         uint32_t limit;
2851 #if 0
2852         static int zzticks;
2853 #endif
2854
2855         /*
2856          * Moderate the number of dirty inodes
2857          */
2858         hammer2_pfs_moderate(ip, always_moderate);
2859
2860         /*
2861          * Atomic check condition and wait.  Also do an early speedup of
2862          * the syncer to try to avoid hitting the wait.
2863          */
2864         for (;;) {
2865                 waiting = pmp->inmem_dirty_chains;
2866                 cpu_ccfence();
2867                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2868
2869                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2870                 if (limit < hammer2_limit_dirty_chains)
2871                         limit = hammer2_limit_dirty_chains;
2872                 if (limit < 1000)
2873                         limit = 1000;
2874
2875 #if 0
2876                 if ((int)(ticks - zzticks) > hz) {
2877                         zzticks = ticks;
2878                         kprintf("count %ld %ld\n", count, limit);
2879                 }
2880 #endif
2881
2882                 /*
2883                  * Block if there are too many dirty chains present, wait
2884                  * for the flush to clean some out.
2885                  */
2886                 if (count > limit) {
2887                         hammer2_pfs_moderate(ip, always_moderate);
2888                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2889                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2890                                                waiting,
2891                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2892                                 if (ticks != pmp->speedup_ticks) {
2893                                         pmp->speedup_ticks = ticks;
2894                                         speedup_syncer(pmp->mp);
2895                                 }
2896                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2897                                        "chnmem", hz);
2898                         }
2899                         continue;       /* loop on success or fail */
2900                 }
2901
2902                 /*
2903                  * Try to start an early flush before we are forced to block.
2904                  */
2905                 if (count > limit * 5 / 10 &&
2906                     ticks != pmp->speedup_ticks) {
2907                         pmp->speedup_ticks = ticks;
2908                         speedup_syncer(pmp->mp);
2909                 }
2910                 break;
2911         }
2912 }
2913
2914 void
2915 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2916 {
2917         if (pmp) {
2918                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2919         }
2920 }
2921
2922 void
2923 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2924 {
2925         uint32_t waiting;
2926
2927         if (pmp) {
2928                 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1);
2929                 /* don't need --waiting to test flag */
2930                 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) {
2931                         atomic_clear_int(&pmp->inmem_dirty_chains,
2932                                          HAMMER2_DIRTYCHAIN_WAITING);
2933                         wakeup(&pmp->inmem_dirty_chains);
2934                 }
2935         }
2936 }
2937
2938 /*
2939  * Returns 0 if the filesystem has tons of free space
2940  * Returns 1 if the filesystem has less than 10% remaining
2941  * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
2942  */
2943 int
2944 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
2945 {
2946         hammer2_pfs_t *pmp;
2947         hammer2_dev_t *hmp;
2948         hammer2_off_t free_reserved;
2949         hammer2_off_t free_nominal;
2950         int i;
2951
2952         pmp = ip->pmp;
2953
2954         if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
2955                 free_reserved = HAMMER2_SEGSIZE;
2956                 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
2957                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2958                         hmp = pmp->pfs_hmps[i];
2959                         if (hmp == NULL)
2960                                 continue;
2961                         if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
2962                             pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
2963                                 continue;
2964
2965                         if (free_nominal > hmp->voldata.allocator_free)
2966                                 free_nominal = hmp->voldata.allocator_free;
2967                         if (free_reserved < hmp->free_reserved)
2968                                 free_reserved = hmp->free_reserved;
2969                 }
2970
2971                 /*
2972                  * SMP races ok
2973                  */
2974                 pmp->free_reserved = free_reserved;
2975                 pmp->free_nominal = free_nominal;
2976                 pmp->free_ticks = ticks;
2977         } else {
2978                 free_reserved = pmp->free_reserved;
2979                 free_nominal = pmp->free_nominal;
2980         }
2981         if (cred && cred->cr_uid != 0) {
2982                 if ((int64_t)(free_nominal - bytes) <
2983                     (int64_t)free_reserved) {
2984                         return 2;
2985                 }
2986         } else {
2987                 if ((int64_t)(free_nominal - bytes) <
2988                     (int64_t)free_reserved / 2) {
2989                         return 2;
2990                 }
2991         }
2992         if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
2993                 return 1;
2994         return 0;
2995 }
2996
2997 /*
2998  * Debugging
2999  */
3000 void
3001 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx,
3002                    u_int flags)
3003 {
3004         hammer2_chain_t *scan;
3005         hammer2_chain_t *parent;
3006
3007         --*countp;
3008         if (*countp == 0) {
3009                 kprintf("%*.*s...\n", tab, tab, "");
3010                 return;
3011         }
3012         if (*countp < 0)
3013                 return;
3014         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
3015                 tab, tab, "", pfx,
3016                 chain, chain->bref.type,
3017                 chain->bref.key, chain->bref.keybits,
3018                 chain->bref.mirror_tid);
3019
3020         kprintf("%*.*s      [%08x] (%s) refs=%d",
3021                 tab, tab, "",
3022                 chain->flags,
3023                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
3024                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
3025                 chain->refs);
3026
3027         parent = chain->parent;
3028         if (parent)
3029                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
3030                         tab, tab, "",
3031                         parent, parent->flags, parent->refs);
3032         if (RB_EMPTY(&chain->core.rbtree)) {
3033                 kprintf("\n");
3034         } else {
3035                 kprintf(" {\n");
3036                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) {
3037                         if ((scan->flags & flags) || flags == (u_int)-1) {
3038                                 hammer2_dump_chain(scan, tab + 4, countp, 'a',
3039                                                    flags);
3040                         }
3041                 }
3042                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
3043                         kprintf("%*.*s}(%s)\n", tab, tab, "",
3044                                 chain->data->ipdata.filename);
3045                 else
3046                         kprintf("%*.*s}\n", tab, tab, "");
3047         }
3048 }