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_cluster_write = 0;          /* physical write clustering */
  87 int hammer2_dedup_enable = 1;
  88 int hammer2_always_compress = 0;        /* always try to compress */
  89 int hammer2_inval_enable = 0;
  90 int hammer2_flush_pipe = 100;
  91 int hammer2_dio_count;
  92 int hammer2_dio_limit = 256;
  93 int hammer2_bulkfree_tps = 5000;
  94 long hammer2_chain_allocs;
  95 long hammer2_chain_frees;
  96 long hammer2_limit_dirty_chains;
  97 long hammer2_limit_dirty_inodes;
  98 long hammer2_count_modified_chains;
  99 long hammer2_iod_invals;
 100 long hammer2_iod_file_read;
 101 long hammer2_iod_meta_read;
 102 long hammer2_iod_indr_read;
 103 long hammer2_iod_fmap_read;
 104 long hammer2_iod_volu_read;
 105 long hammer2_iod_file_write;
 106 long hammer2_iod_file_wembed;
 107 long hammer2_iod_file_wzero;
 108 long hammer2_iod_file_wdedup;
 109 long hammer2_iod_meta_write;
 110 long hammer2_iod_indr_write;
 111 long hammer2_iod_fmap_write;
 112 long hammer2_iod_volu_write;
 113
 114 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 115 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 116                 "Buffer used for compression.");
 117
 118 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 119 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 120                 "Buffer used for decompression.");
 121
 122 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 123
 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
 125            &hammer2_supported_version, 0, "");
 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 127            &hammer2_debug, 0, "");
 128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
 129            &hammer2_cluster_meta_read, 0, "");
 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
 131            &hammer2_cluster_data_read, 0, "");
 132 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW,
 133            &hammer2_cluster_write, 0, "");
 134 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
 135            &hammer2_dedup_enable, 0, "");
 136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
 137            &hammer2_always_compress, 0, "");
 138 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
 139            &hammer2_inval_enable, 0, "");
 140 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 141            &hammer2_flush_pipe, 0, "");
 142 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
 143            &hammer2_bulkfree_tps, 0, "");
 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
 145            &hammer2_chain_allocs, 0, "");
 146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
 147            &hammer2_chain_frees, 0, "");
 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 149            &hammer2_limit_dirty_chains, 0, "");
 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW,
 151            &hammer2_limit_dirty_inodes, 0, "");
 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 153            &hammer2_count_modified_chains, 0, "");
 154 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 155            &hammer2_dio_count, 0, "");
 156 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
 157            &hammer2_dio_limit, 0, "");
 158
 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
 160            &hammer2_iod_invals, 0, "");
 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 162            &hammer2_iod_file_read, 0, "");
 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 164            &hammer2_iod_meta_read, 0, "");
 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 166            &hammer2_iod_indr_read, 0, "");
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 168            &hammer2_iod_fmap_read, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 170            &hammer2_iod_volu_read, 0, "");
 171
 172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 173            &hammer2_iod_file_write, 0, "");
 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 175            &hammer2_iod_file_wembed, 0, "");
 176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 177            &hammer2_iod_file_wzero, 0, "");
 178 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 179            &hammer2_iod_file_wdedup, 0, "");
 180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 181            &hammer2_iod_meta_write, 0, "");
 182 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 183            &hammer2_iod_indr_write, 0, "");
 184 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 185            &hammer2_iod_fmap_write, 0, "");
 186 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 187            &hammer2_iod_volu_write, 0, "");
 188
 189 long hammer2_process_icrc32;
 190 long hammer2_process_xxhash64;
 191 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW,
 192            &hammer2_process_icrc32, 0, "");
 193 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW,
 194            &hammer2_process_xxhash64, 0, "");
 195
 196 static int hammer2_vfs_init(struct vfsconf *conf);
 197 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 198 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 199                                 struct ucred *cred);
 200 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 201                                 struct vnode *, struct ucred *);
 202 static int hammer2_recovery(hammer2_dev_t *hmp);
 203 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 204 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 205 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 206                                 struct ucred *cred);
 207 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 208                                 struct ucred *cred);
 209 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 210                                 struct fid *fhp, struct vnode **vpp);
 211 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 212 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 213                                 int *exflagsp, struct ucred **credanonp);
 214
 215 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 216 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 217
 218 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 219
 220 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 221 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 222                                 hammer2_dev_t *hmp);
 223 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
 224
 225 /*
 226  * HAMMER2 vfs operations.
 227  */
 228 static struct vfsops hammer2_vfsops = {
 229         .vfs_init       = hammer2_vfs_init,
 230         .vfs_uninit     = hammer2_vfs_uninit,
 231         .vfs_sync       = hammer2_vfs_sync,
 232         .vfs_mount      = hammer2_vfs_mount,
 233         .vfs_unmount    = hammer2_vfs_unmount,
 234         .vfs_root       = hammer2_vfs_root,
 235         .vfs_statfs     = hammer2_vfs_statfs,
 236         .vfs_statvfs    = hammer2_vfs_statvfs,
 237         .vfs_vget       = hammer2_vfs_vget,
 238         .vfs_vptofh     = hammer2_vfs_vptofh,
 239         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 240         .vfs_checkexp   = hammer2_vfs_checkexp
 241 };
 242
 243 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 244
 245 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
 246 MODULE_VERSION(hammer2, 1);
 247
 248 static
 249 int
 250 hammer2_vfs_init(struct vfsconf *conf)
 251 {
 252         static struct objcache_malloc_args margs_read;
 253         static struct objcache_malloc_args margs_write;
 254         static struct objcache_malloc_args margs_vop;
 255
 256         int error;
 257
 258         error = 0;
 259
 260         /*
 261          * A large DIO cache is needed to retain dedup enablement masks.
 262          * The bulkfree code clears related masks as part of the disk block
 263          * recycling algorithm, preventing it from being used for a later
 264          * dedup.
 265          *
 266          * NOTE: A large buffer cache can actually interfere with dedup
 267          *       operation because we dedup based on media physical buffers
 268          *       and not logical buffers.  Try to make the DIO case large
 269          *       enough to avoid this problem, but also cap it.
 270          */
 271         hammer2_dio_limit = nbuf * 2;
 272         if (hammer2_dio_limit > 100000)
 273                 hammer2_dio_limit = 100000;
 274
 275         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 276                 error = EINVAL;
 277         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 278                 error = EINVAL;
 279         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 280                 error = EINVAL;
 281
 282         if (error)
 283                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 284
 285         margs_read.objsize = 65536;
 286         margs_read.mtype = M_HAMMER2_DEBUFFER;
 287
 288         margs_write.objsize = 32768;
 289         margs_write.mtype = M_HAMMER2_CBUFFER;
 290
 291         margs_vop.objsize = sizeof(hammer2_xop_t);
 292         margs_vop.mtype = M_HAMMER2;
 293
 294         /*
 295          * Note thaht for the XOPS cache we want backing store allocations
 296          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 297          * confusion), so use the backing store function that does it.  This
 298          * means that initial XOPS objects are zerod but REUSED objects are
 299          * not.  So we are responsible for cleaning the object up sufficiently
 300          * for our needs before objcache_put()ing it back (typically just the
 301          * FIFO indices).
 302          */
 303         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 304                                 0, 1, NULL, NULL, NULL,
 305                                 objcache_malloc_alloc,
 306                                 objcache_malloc_free,
 307                                 &margs_read);
 308         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 309                                 0, 1, NULL, NULL, NULL,
 310                                 objcache_malloc_alloc,
 311                                 objcache_malloc_free,
 312                                 &margs_write);
 313         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 314                                 0, 1, NULL, NULL, NULL,
 315                                 objcache_malloc_alloc_zero,
 316                                 objcache_malloc_free,
 317                                 &margs_vop);
 318
 319
 320         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 321         TAILQ_INIT(&hammer2_mntlist);
 322         TAILQ_INIT(&hammer2_pfslist);
 323         TAILQ_INIT(&hammer2_spmplist);
 324
 325         hammer2_limit_dirty_chains = maxvnodes / 10;
 326         if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
 327                 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
 328
 329         hammer2_limit_dirty_inodes = maxvnodes / 100;
 330         if (hammer2_limit_dirty_inodes < 100)
 331                 hammer2_limit_dirty_inodes = 100;
 332         if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES)
 333                 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES;
 334
 335         return (error);
 336 }
 337
 338 static
 339 int
 340 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 341 {
 342         objcache_destroy(cache_buffer_read);
 343         objcache_destroy(cache_buffer_write);
 344         objcache_destroy(cache_xops);
 345         return 0;
 346 }
 347
 348 /*
 349  * Core PFS allocator.  Used to allocate or reference the pmp structure
 350  * for PFS cluster mounts and the spmp structure for media (hmp) structures.
 351  * The pmp can be passed in or loaded by this function using the chain and
 352  * inode data.
 353  *
 354  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 355  * transactions.  Note that synchronization does not use this field.
 356  * (typically frontend operations and synchronization cannot run on the
 357  * same PFS node at the same time).
 358  *
 359  * XXX check locking
 360  */
 361 hammer2_pfs_t *
 362 hammer2_pfsalloc(hammer2_chain_t *chain,
 363                  const hammer2_inode_data_t *ripdata,
 364                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 365 {
 366         hammer2_pfs_t *pmp;
 367         hammer2_inode_t *iroot;
 368         int count;
 369         int i;
 370         int j;
 371
 372         pmp = NULL;
 373
 374         /*
 375          * Locate or create the PFS based on the cluster id.  If ripdata
 376          * is NULL this is a spmp which is unique and is always allocated.
 377          *
 378          * If the device is mounted in local mode all PFSs are considered
 379          * independent and not part of any cluster (for debugging only).
 380          */
 381         if (ripdata) {
 382                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 383                         if (force_local != pmp->force_local)
 384                                 continue;
 385                         if (force_local == NULL &&
 386                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 387                                  sizeof(pmp->pfs_clid)) == 0) {
 388                                         break;
 389                         } else if (force_local && pmp->pfs_names[0] &&
 390                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 391                                         break;
 392                         }
 393                 }
 394         }
 395
 396         if (pmp == NULL) {
 397                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 398                 pmp->force_local = force_local;
 399                 hammer2_trans_manage_init(pmp);
 400                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 401                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 402                 lockinit(&pmp->lock, "pfslk", 0, 0);
 403                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 404                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 405                 spin_init(&pmp->xop_spin, "h2xop");
 406                 spin_init(&pmp->lru_spin, "h2lru");
 407                 RB_INIT(&pmp->inum_tree);
 408                 TAILQ_INIT(&pmp->sideq);
 409                 TAILQ_INIT(&pmp->lru_list);
 410                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 411
 412                 /*
 413                  * Distribute backend operations to threads
 414                  */
 415                 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
 416                         hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
 417
 418                 /*
 419                  * Save the last media transaction id for the flusher.  Set
 420                  * initial
 421                  */
 422                 if (ripdata) {
 423                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 424                         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 425                 } else {
 426                         pmp->flags |= HAMMER2_PMPF_SPMP;
 427                         TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
 428                 }
 429
 430                 /*
 431                  * The synchronization thread may start too early, make
 432                  * sure it stays frozen until we are ready to let it go.
 433                  * XXX
 434                  */
 435                 /*
 436                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 437                                          HAMMER2_THREAD_REMASTER;
 438                 */
 439         }
 440
 441         /*
 442          * Create the PFS's root inode and any missing XOP helper threads.
 443          */
 444         if ((iroot = pmp->iroot) == NULL) {
 445                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 446                 if (ripdata)
 447                         iroot->meta = ripdata->meta;
 448                 pmp->iroot = iroot;
 449                 hammer2_inode_ref(iroot);
 450                 hammer2_inode_unlock(iroot);
 451         }
 452
 453         /*
 454          * Stop here if no chain is passed in.
 455          */
 456         if (chain == NULL)
 457                 goto done;
 458
 459         /*
 460          * When a chain is passed in we must add it to the PFS's root
 461          * inode, update pmp->pfs_types[], and update the syncronization
 462          * threads.
 463          *
 464          * When forcing local mode, mark the PFS as a MASTER regardless.
 465          *
 466          * At the moment empty spots can develop due to removals or failures.
 467          * Ultimately we want to re-fill these spots but doing so might
 468          * confused running code. XXX
 469          */
 470         hammer2_inode_ref(iroot);
 471         hammer2_mtx_ex(&iroot->lock);
 472         j = iroot->cluster.nchains;
 473
 474         if (j == HAMMER2_MAXCLUSTER) {
 475                 kprintf("hammer2_mount: cluster full!\n");
 476                 /* XXX fatal error? */
 477         } else {
 478                 KKASSERT(chain->pmp == NULL);
 479                 chain->pmp = pmp;
 480                 hammer2_chain_ref(chain);
 481                 iroot->cluster.array[j].chain = chain;
 482                 if (force_local)
 483                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 484                 else
 485                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 486                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 487                 pmp->pfs_hmps[j] = chain->hmp;
 488
 489                 /*
 490                  * If the PFS is already mounted we must account
 491                  * for the mount_count here.
 492                  */
 493                 if (pmp->mp)
 494                         ++chain->hmp->mount_count;
 495
 496                 /*
 497                  * May have to fixup dirty chain tracking.  Previous
 498                  * pmp was NULL so nothing to undo.
 499                  */
 500                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 501                         hammer2_pfs_memory_inc(pmp);
 502                 ++j;
 503         }
 504         iroot->cluster.nchains = j;
 505
 506         /*
 507          * Update nmasters from any PFS inode which is part of the cluster.
 508          * It is possible that this will result in a value which is too
 509          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 510          * override this value later on.
 511          *
 512          * (This informs us of masters that might not currently be
 513          *  discoverable by this mount).
 514          */
 515         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 516                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 517         }
 518
 519         /*
 520          * Count visible masters.  Masters are usually added with
 521          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 522          * are more (XXX and must update the master inodes).
 523          */
 524         count = 0;
 525         for (i = 0; i < iroot->cluster.nchains; ++i) {
 526                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 527                         ++count;
 528         }
 529         if (pmp->pfs_nmasters < count)
 530                 pmp->pfs_nmasters = count;
 531
 532         /*
 533          * Create missing synchronization and support threads.
 534          *
 535          * Single-node masters (including snapshots) have nothing to
 536          * synchronize and do not require this thread.
 537          *
 538          * Multi-node masters or any number of soft masters, slaves, copy,
 539          * or other PFS types need the thread.
 540          *
 541          * Each thread is responsible for its particular cluster index.
 542          * We use independent threads so stalls or mismatches related to
 543          * any given target do not affect other targets.
 544          */
 545         for (i = 0; i < iroot->cluster.nchains; ++i) {
 546                 /*
 547                  * Single-node masters (including snapshots) have nothing
 548                  * to synchronize and will make direct xops support calls,
 549                  * thus they do not require this thread.
 550                  *
 551                  * Note that there can be thousands of snapshots.  We do not
 552                  * want to create thousands of threads.
 553                  */
 554                 if (pmp->pfs_nmasters <= 1 &&
 555                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 556                         continue;
 557                 }
 558
 559                 /*
 560                  * Sync support thread
 561                  */
 562                 if (pmp->sync_thrs[i].td == NULL) {
 563                         hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
 564                                            "h2nod", i, -1,
 565                                            hammer2_primary_sync_thread);
 566                 }
 567         }
 568
 569         /*
 570          * Create missing Xop threads
 571          *
 572          * NOTE: We create helper threads for all mounted PFSs or any
 573          *       PFSs with 2+ nodes (so the sync thread can update them,
 574          *       even if not mounted).
 575          */
 576         if (pmp->mp || iroot->cluster.nchains >= 2)
 577                 hammer2_xop_helper_create(pmp);
 578
 579         hammer2_mtx_unlock(&iroot->lock);
 580         hammer2_inode_drop(iroot);
 581 done:
 582         return pmp;
 583 }
 584
 585 /*
 586  * Deallocate an element of a probed PFS.  If destroying and this is a
 587  * MASTER, adjust nmasters.
 588  *
 589  * This function does not physically destroy the PFS element in its device
 590  * under the super-root  (see hammer2_ioctl_pfs_delete()).
 591  */
 592 void
 593 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
 594 {
 595         hammer2_inode_t *iroot;
 596         hammer2_chain_t *chain;
 597         int j;
 598
 599         /*
 600          * Cleanup our reference on iroot.  iroot is (should) not be needed
 601          * by the flush code.
 602          */
 603         iroot = pmp->iroot;
 604         if (iroot) {
 605                 /*
 606                  * Stop synchronizing
 607                  *
 608                  * XXX flush after acquiring the iroot lock.
 609                  * XXX clean out the cluster index from all inode structures.
 610                  */
 611                 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
 612
 613                 /*
 614                  * Remove the cluster index from the group.  If destroying
 615                  * the PFS and this is a master, adjust pfs_nmasters.
 616                  */
 617                 hammer2_mtx_ex(&iroot->lock);
 618                 chain = iroot->cluster.array[clindex].chain;
 619                 iroot->cluster.array[clindex].chain = NULL;
 620
 621                 switch(pmp->pfs_types[clindex]) {
 622                 case HAMMER2_PFSTYPE_MASTER:
 623                         if (destroying && pmp->pfs_nmasters > 0)
 624                                 --pmp->pfs_nmasters;
 625                         /* XXX adjust ripdata->meta.pfs_nmasters */
 626                         break;
 627                 default:
 628                         break;
 629                 }
 630                 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
 631
 632                 hammer2_mtx_unlock(&iroot->lock);
 633
 634                 /*
 635                  * Release the chain.
 636                  */
 637                 if (chain) {
 638                         atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 639                         hammer2_chain_drop(chain);
 640                 }
 641
 642                 /*
 643                  * Terminate all XOP threads for the cluster index.
 644                  */
 645                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 646                         hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
 647         }
 648 }
 649
 650 /*
 651  * Destroy a PFS, typically only occurs after the last mount on a device
 652  * has gone away.
 653  */
 654 static void
 655 hammer2_pfsfree(hammer2_pfs_t *pmp)
 656 {
 657         hammer2_inode_t *iroot;
 658         hammer2_chain_t *chain;
 659         int i;
 660         int j;
 661
 662         /*
 663          * Cleanup our reference on iroot.  iroot is (should) not be needed
 664          * by the flush code.
 665          */
 666         if (pmp->flags & HAMMER2_PMPF_SPMP)
 667                 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
 668         else
 669                 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 670
 671         iroot = pmp->iroot;
 672         if (iroot) {
 673                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 674                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 675                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 676                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 677                 }
 678 #if REPORT_REFS_ERRORS
 679                 if (pmp->iroot->refs != 1)
 680                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 681                                 pmp->iroot, pmp->iroot->refs);
 682 #else
 683                 KKASSERT(pmp->iroot->refs == 1);
 684 #endif
 685                 /* ref for pmp->iroot */
 686                 hammer2_inode_drop(pmp->iroot);
 687                 pmp->iroot = NULL;
 688         }
 689
 690         /*
 691          * Cleanup chains remaining on LRU list.
 692          */
 693         hammer2_spin_ex(&pmp->lru_spin);
 694         while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
 695                 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
 696                 atomic_add_int(&pmp->lru_count, -1);
 697                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
 698                 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
 699                 hammer2_chain_ref(chain);
 700                 hammer2_spin_unex(&pmp->lru_spin);
 701                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 702                 hammer2_chain_drop(chain);
 703                 hammer2_spin_ex(&pmp->lru_spin);
 704         }
 705         hammer2_spin_unex(&pmp->lru_spin);
 706
 707         /*
 708          * Free remaining pmp resources
 709          */
 710         kmalloc_destroy(&pmp->mmsg);
 711         kmalloc_destroy(&pmp->minode);
 712
 713         kfree(pmp, M_HAMMER2);
 714 }
 715
 716 /*
 717  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 718  * empty is terminated and freed.
 719  *
 720  * XXX inefficient.
 721  */
 722 static void
 723 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
 724 {
 725         hammer2_pfs_t *pmp;
 726         hammer2_inode_t *iroot;
 727         hammer2_chain_t *rchain;
 728         int didfreeze;
 729         int i;
 730         int j;
 731         struct hammer2_pfslist *wlist;
 732
 733         if (which == 0)
 734                 wlist = &hammer2_pfslist;
 735         else
 736                 wlist = &hammer2_spmplist;
 737 again:
 738         TAILQ_FOREACH(pmp, wlist, mntentry) {
 739                 if ((iroot = pmp->iroot) == NULL)
 740                         continue;
 741                 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
 742                 hammer2_inode_run_sideq(pmp, 1);
 743                 hammer2_bioq_sync(pmp);
 744                 hammer2_trans_done(pmp, 0);
 745
 746                 /*
 747                  * Determine if this PFS is affected.  If it is we must
 748                  * freeze all management threads and lock its iroot.
 749                  *
 750                  * Freezing a management thread forces it idle, operations
 751                  * in-progress will be aborted and it will have to start
 752                  * over again when unfrozen, or exit if told to exit.
 753                  */
 754                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 755                         if (pmp->pfs_hmps[i] == hmp)
 756                                 break;
 757                 }
 758                 if (i != HAMMER2_MAXCLUSTER) {
 759                         /*
 760                          * Make sure all synchronization threads are locked
 761                          * down.
 762                          */
 763                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 764                                 if (pmp->pfs_hmps[i] == NULL)
 765                                         continue;
 766                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 767                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 768                                         hammer2_thr_freeze_async(
 769                                                 &pmp->xop_groups[j].thrs[i]);
 770                                 }
 771                         }
 772                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 773                                 if (pmp->pfs_hmps[i] == NULL)
 774                                         continue;
 775                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 776                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 777                                         hammer2_thr_freeze(
 778                                                 &pmp->xop_groups[j].thrs[i]);
 779                                 }
 780                         }
 781
 782                         /*
 783                          * Lock the inode and clean out matching chains.
 784                          * Note that we cannot use hammer2_inode_lock_*()
 785                          * here because that would attempt to validate the
 786                          * cluster that we are in the middle of ripping
 787                          * apart.
 788                          *
 789                          * WARNING! We are working directly on the inodes
 790                          *          embedded cluster.
 791                          */
 792                         hammer2_mtx_ex(&iroot->lock);
 793
 794                         /*
 795                          * Remove the chain from matching elements of the PFS.
 796                          */
 797                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 798                                 if (pmp->pfs_hmps[i] != hmp)
 799                                         continue;
 800                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 801                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 802                                         hammer2_thr_delete(
 803                                                 &pmp->xop_groups[j].thrs[i]);
 804                                 }
 805                                 rchain = iroot->cluster.array[i].chain;
 806                                 iroot->cluster.array[i].chain = NULL;
 807                                 pmp->pfs_types[i] = 0;
 808                                 if (pmp->pfs_names[i]) {
 809                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 810                                         pmp->pfs_names[i] = NULL;
 811                                 }
 812                                 if (rchain) {
 813                                         hammer2_chain_drop(rchain);
 814                                         /* focus hint */
 815                                         if (iroot->cluster.focus == rchain)
 816                                                 iroot->cluster.focus = NULL;
 817                                 }
 818                                 pmp->pfs_hmps[i] = NULL;
 819                         }
 820                         hammer2_mtx_unlock(&iroot->lock);
 821                         didfreeze = 1;  /* remaster, unfreeze down below */
 822                 } else {
 823                         didfreeze = 0;
 824                 }
 825
 826                 /*
 827                  * Cleanup trailing chains.  Gaps may remain.
 828                  */
 829                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 830                         if (pmp->pfs_hmps[i])
 831                                 break;
 832                 }
 833                 iroot->cluster.nchains = i + 1;
 834
 835                 /*
 836                  * If the PMP has no elements remaining we can destroy it.
 837                  * (this will transition management threads from frozen->exit).
 838                  */
 839                 if (iroot->cluster.nchains == 0) {
 840                         /*
 841                          * If this was the hmp's spmp, we need to clean
 842                          * a little more stuff out.
 843                          */
 844                         if (hmp->spmp == pmp) {
 845                                 hmp->spmp = NULL;
 846                                 hmp->vchain.pmp = NULL;
 847                                 hmp->fchain.pmp = NULL;
 848                         }
 849
 850                         /*
 851                          * Free the pmp and restart the loop
 852                          */
 853                         hammer2_pfsfree(pmp);
 854                         goto again;
 855                 }
 856
 857                 /*
 858                  * If elements still remain we need to set the REMASTER
 859                  * flag and unfreeze it.
 860                  */
 861                 if (didfreeze) {
 862                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 863                                 if (pmp->pfs_hmps[i] == NULL)
 864                                         continue;
 865                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 866                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 867                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 868                                         hammer2_thr_remaster(
 869                                                 &pmp->xop_groups[j].thrs[i]);
 870                                         hammer2_thr_unfreeze(
 871                                                 &pmp->xop_groups[j].thrs[i]);
 872                                 }
 873                         }
 874                 }
 875         }
 876 }
 877
 878 /*
 879  * Mount or remount HAMMER2 fileystem from physical media
 880  *
 881  *      mountroot
 882  *              mp              mount point structure
 883  *              path            NULL
 884  *              data            <unused>
 885  *              cred            <unused>
 886  *
 887  *      mount
 888  *              mp              mount point structure
 889  *              path            path to mount point
 890  *              data            pointer to argument structure in user space
 891  *                      volume  volume path (device@LABEL form)
 892  *                      hflags  user mount flags
 893  *              cred            user credentials
 894  *
 895  * RETURNS:     0       Success
 896  *              !0      error number
 897  */
 898 static
 899 int
 900 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 901                   struct ucred *cred)
 902 {
 903         struct hammer2_mount_info info;
 904         hammer2_pfs_t *pmp;
 905         hammer2_pfs_t *spmp;
 906         hammer2_dev_t *hmp;
 907         hammer2_dev_t *force_local;
 908         hammer2_key_t key_next;
 909         hammer2_key_t key_dummy;
 910         hammer2_key_t lhc;
 911         struct vnode *devvp;
 912         struct nlookupdata nd;
 913         hammer2_chain_t *parent;
 914         hammer2_chain_t *chain;
 915         const hammer2_inode_data_t *ripdata;
 916         hammer2_blockref_t bref;
 917         struct file *fp;
 918         char devstr[MNAMELEN];
 919         size_t size;
 920         size_t done;
 921         char *dev;
 922         char *label;
 923         int ronly = 1;
 924         int error;
 925         int i;
 926
 927         hmp = NULL;
 928         pmp = NULL;
 929         dev = NULL;
 930         label = NULL;
 931         devvp = NULL;
 932
 933         if (path == NULL) {
 934                 /*
 935                  * Root mount
 936                  */
 937                 bzero(&info, sizeof(info));
 938                 info.cluster_fd = -1;
 939                 ksnprintf(devstr, sizeof(devstr), "%s",
 940                           mp->mnt_stat.f_mntfromname);
 941                 kprintf("hammer2_mount: root '%s'\n", devstr);
 942                 done = strlen(devstr) + 1;
 943         } else {
 944                 /*
 945                  * Non-root mount or updating a mount
 946                  */
 947                 error = copyin(data, &info, sizeof(info));
 948                 if (error)
 949                         return (error);
 950
 951                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 952                 if (error)
 953                         return (error);
 954                 kprintf("hammer2_mount: '%s'\n", devstr);
 955         }
 956
 957         /*
 958          * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
 959          * if no label specified, based on the partition id.  Error out if no
 960          * label or device (with partition id) is specified.  This is strictly
 961          * a convenience to match the default label created by newfs_hammer2,
 962          * our preference is that a label always be specified.
 963          *
 964          * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command
 965          *       that does not specify a device, as long as some H2 label
 966          *       has already been mounted from that device.  This makes
 967          *       mounting snapshots a lot easier.
 968          */
 969         dev = devstr;
 970         label = strchr(devstr, '@');
 971         if (label && ((label + 1) - dev) > done) {
 972                 kprintf("hammer2: mount: bad label %s/%zd\n",
 973                         devstr, done);
 974                 return (EINVAL);
 975         }
 976         if (label == NULL || label[1] == 0) {
 977                 char slice;
 978
 979                 if (label == NULL)
 980                         label = devstr + strlen(devstr);
 981                 else
 982                         *label = '\0';          /* clean up trailing @ */
 983
 984                 slice = label[-1];
 985                 switch(slice) {
 986                 case 'a':
 987                         label = "BOOT";
 988                         break;
 989                 case 'd':
 990                         label = "ROOT";
 991                         break;
 992                 default:
 993                         label = "DATA";
 994                         break;
 995                 }
 996         } else {
 997                 *label = '\0';
 998                 label++;
 999         }
1000
1001         kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
1002                 dev, label, (mp->mnt_flag & MNT_RDONLY));
1003
1004         if (mp->mnt_flag & MNT_UPDATE) {
1005                 /*
1006                  * Update mount.  Note that pmp->iroot->cluster is
1007                  * an inode-embedded cluster and thus cannot be
1008                  * directly locked.
1009                  *
1010                  * XXX HAMMER2 needs to implement NFS export via
1011                  *     mountctl.
1012                  */
1013                 hammer2_cluster_t *cluster;
1014
1015                 pmp = MPTOPMP(mp);
1016                 pmp->hflags = info.hflags;
1017                 cluster = &pmp->iroot->cluster;
1018                 for (i = 0; i < cluster->nchains; ++i) {
1019                         if (cluster->array[i].chain == NULL)
1020                                 continue;
1021                         hmp = cluster->array[i].chain->hmp;
1022                         devvp = hmp->devvp;
1023                         error = hammer2_remount(hmp, mp, path,
1024                                                 devvp, cred);
1025                         if (error)
1026                                 break;
1027                 }
1028
1029                 return error;
1030         }
1031
1032         /*
1033          * HMP device mount
1034          *
1035          * If a path is specified and dev is not an empty string, lookup the
1036          * name and verify that it referes to a block device.
1037          *
1038          * If a path is specified and dev is an empty string we fall through
1039          * and locate the label in the hmp search.
1040          */
1041         if (path && *dev != 0) {
1042                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
1043                 if (error == 0)
1044                         error = nlookup(&nd);
1045                 if (error == 0)
1046                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
1047                 nlookup_done(&nd);
1048         } else if (path == NULL) {
1049                 /* root mount */
1050                 cdev_t cdev = kgetdiskbyname(dev);
1051                 error = bdevvp(cdev, &devvp);
1052                 if (error)
1053                         kprintf("hammer2: cannot find '%s'\n", dev);
1054         } else {
1055                 /*
1056                  * We will locate the hmp using the label in the hmp loop.
1057                  */
1058                 error = 0;
1059         }
1060
1061         /*
1062          * Make sure its a block device.  Do not check to see if it is
1063          * already mounted until we determine that its a fresh H2 device.
1064          */
1065         if (error == 0 && devvp) {
1066                 vn_isdisk(devvp, &error);
1067         }
1068
1069         /*
1070          * Determine if the device has already been mounted.  After this
1071          * check hmp will be non-NULL if we are doing the second or more
1072          * hammer2 mounts from the same device.
1073          */
1074         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1075         if (devvp) {
1076                 /*
1077                  * Match the device.  Due to the way devfs works,
1078                  * we may not be able to directly match the vnode pointer,
1079                  * so also check to see if the underlying device matches.
1080                  */
1081                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1082                         if (hmp->devvp == devvp)
1083                                 break;
1084                         if (devvp->v_rdev &&
1085                             hmp->devvp->v_rdev == devvp->v_rdev) {
1086                                 break;
1087                         }
1088                 }
1089
1090                 /*
1091                  * If no match this may be a fresh H2 mount, make sure
1092                  * the device is not mounted on anything else.
1093                  */
1094                 if (hmp == NULL)
1095                         error = vfs_mountedon(devvp);
1096         } else if (error == 0) {
1097                 /*
1098                  * Match the label to a pmp already probed.
1099                  */
1100                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1101                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1102                                 if (pmp->pfs_names[i] &&
1103                                     strcmp(pmp->pfs_names[i], label) == 0) {
1104                                         hmp = pmp->pfs_hmps[i];
1105                                         break;
1106                                 }
1107                         }
1108                         if (hmp)
1109                                 break;
1110                 }
1111                 if (hmp == NULL)
1112                         error = ENOENT;
1113         }
1114
1115         /*
1116          * Open the device if this isn't a secondary mount and construct
1117          * the H2 device mount (hmp).
1118          */
1119         if (hmp == NULL) {
1120                 hammer2_chain_t *schain;
1121                 hammer2_xid_t xid;
1122                 hammer2_xop_head_t xop;
1123
1124                 if (error == 0 && vcount(devvp) > 0) {
1125                         kprintf("Primary device already has references\n");
1126                         error = EBUSY;
1127                 }
1128
1129                 /*
1130                  * Now open the device
1131                  */
1132                 if (error == 0) {
1133                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1134                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1135                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
1136                         if (error == 0) {
1137                                 error = VOP_OPEN(devvp,
1138                                              (ronly ? FREAD : FREAD | FWRITE),
1139                                              FSCRED, NULL);
1140                         }
1141                         vn_unlock(devvp);
1142                 }
1143                 if (error && devvp) {
1144                         vrele(devvp);
1145                         devvp = NULL;
1146                 }
1147                 if (error) {
1148                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1149                         return error;
1150                 }
1151                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1152                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1153                 hmp->ronly = ronly;
1154                 hmp->devvp = devvp;
1155                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1156                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1157                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1158                 RB_INIT(&hmp->iotree);
1159                 spin_init(&hmp->io_spin, "hm2mount_io");
1160                 spin_init(&hmp->list_spin, "hm2mount_list");
1161                 TAILQ_INIT(&hmp->flushq);
1162
1163                 lockinit(&hmp->vollk, "h2vol", 0, 0);
1164                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1165                 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1166
1167                 /*
1168                  * vchain setup. vchain.data is embedded.
1169                  * vchain.refs is initialized and will never drop to 0.
1170                  *
1171                  * NOTE! voldata is not yet loaded.
1172                  */
1173                 hmp->vchain.hmp = hmp;
1174                 hmp->vchain.refs = 1;
1175                 hmp->vchain.data = (void *)&hmp->voldata;
1176                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1177                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1178                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1179
1180                 hammer2_chain_core_init(&hmp->vchain);
1181                 /* hmp->vchain.u.xxx is left NULL */
1182
1183                 /*
1184                  * fchain setup.  fchain.data is embedded.
1185                  * fchain.refs is initialized and will never drop to 0.
1186                  *
1187                  * The data is not used but needs to be initialized to
1188                  * pass assertion muster.  We use this chain primarily
1189                  * as a placeholder for the freemap's top-level RBTREE
1190                  * so it does not interfere with the volume's topology
1191                  * RBTREE.
1192                  */
1193                 hmp->fchain.hmp = hmp;
1194                 hmp->fchain.refs = 1;
1195                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1196                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1197                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1198                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1199                 hmp->fchain.bref.methods =
1200                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1201                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1202
1203                 hammer2_chain_core_init(&hmp->fchain);
1204                 /* hmp->fchain.u.xxx is left NULL */
1205
1206                 /*
1207                  * Install the volume header and initialize fields from
1208                  * voldata.
1209                  */
1210                 error = hammer2_install_volume_header(hmp);
1211                 if (error) {
1212                         hammer2_unmount_helper(mp, NULL, hmp);
1213                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1214                         hammer2_vfs_unmount(mp, MNT_FORCE);
1215                         return error;
1216                 }
1217
1218                 /*
1219                  * Really important to get these right or flush will get
1220                  * confused.
1221                  */
1222                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1223                 spmp = hmp->spmp;
1224
1225                 /*
1226                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
1227                  * is inherited from the volume header.
1228                  */
1229                 xid = 0;
1230                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1231                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1232                 hmp->vchain.pmp = spmp;
1233                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1234                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1235                 hmp->fchain.pmp = spmp;
1236
1237                 /*
1238                  * First locate the super-root inode, which is key 0
1239                  * relative to the volume header's blockset.
1240                  *
1241                  * Then locate the root inode by scanning the directory keyspace
1242                  * represented by the label.
1243                  */
1244                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1245                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1246                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1247                                       &error, 0);
1248                 hammer2_chain_lookup_done(parent);
1249                 if (schain == NULL) {
1250                         kprintf("hammer2_mount: invalid super-root\n");
1251                         hammer2_unmount_helper(mp, NULL, hmp);
1252                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1253                         hammer2_vfs_unmount(mp, MNT_FORCE);
1254                         return EINVAL;
1255                 }
1256                 if (schain->error) {
1257                         kprintf("hammer2_mount: error %s reading super-root\n",
1258                                 hammer2_error_str(schain->error));
1259                         hammer2_chain_unlock(schain);
1260                         hammer2_chain_drop(schain);
1261                         schain = NULL;
1262                         hammer2_unmount_helper(mp, NULL, hmp);
1263                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1264                         hammer2_vfs_unmount(mp, MNT_FORCE);
1265                         return EINVAL;
1266                 }
1267
1268                 /*
1269                  * The super-root always uses an inode_tid of 1 when
1270                  * creating PFSs.
1271                  */
1272                 spmp->inode_tid = 1;
1273                 spmp->modify_tid = schain->bref.modify_tid + 1;
1274
1275                 /*
1276                  * Sanity-check schain's pmp and finish initialization.
1277                  * Any chain belonging to the super-root topology should
1278                  * have a NULL pmp (not even set to spmp).
1279                  */
1280                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1281                 KKASSERT(schain->pmp == NULL);
1282                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1283
1284                 /*
1285                  * Replace the dummy spmp->iroot with a real one.  It's
1286                  * easier to just do a wholesale replacement than to try
1287                  * to update the chain and fixup the iroot fields.
1288                  *
1289                  * The returned inode is locked with the supplied cluster.
1290                  */
1291                 hammer2_dummy_xop_from_chain(&xop, schain);
1292                 hammer2_inode_drop(spmp->iroot);
1293                 spmp->iroot = NULL;
1294                 spmp->iroot = hammer2_inode_get(spmp, NULL, &xop, -1);
1295                 spmp->spmp_hmp = hmp;
1296                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1297                 spmp->pfs_hmps[0] = hmp;
1298                 hammer2_inode_ref(spmp->iroot);
1299                 hammer2_inode_unlock(spmp->iroot);
1300                 hammer2_cluster_unlock(&xop.cluster);
1301                 hammer2_chain_drop(schain);
1302                 /* do not call hammer2_cluster_drop() on an embedded cluster */
1303                 schain = NULL;  /* now invalid */
1304                 /* leave spmp->iroot with one ref */
1305
1306                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1307                         error = hammer2_recovery(hmp);
1308                         if (error == 0)
1309                                 error |= hammer2_fixup_pfses(hmp);
1310                         /* XXX do something with error */
1311                 }
1312                 hammer2_update_pmps(hmp);
1313                 hammer2_iocom_init(hmp);
1314                 hammer2_bulkfree_init(hmp);
1315
1316                 /*
1317                  * Ref the cluster management messaging descriptor.  The mount
1318                  * program deals with the other end of the communications pipe.
1319                  *
1320                  * Root mounts typically do not supply one.
1321                  */
1322                 if (info.cluster_fd >= 0) {
1323                         fp = holdfp(curthread, info.cluster_fd, -1);
1324                         if (fp) {
1325                                 hammer2_cluster_reconnect(hmp, fp);
1326                         } else {
1327                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1328                         }
1329                 }
1330         } else {
1331                 spmp = hmp->spmp;
1332                 if (info.hflags & HMNT2_DEVFLAGS) {
1333                         kprintf("hammer2: Warning: mount flags pertaining "
1334                                 "to the whole device may only be specified "
1335                                 "on the first mount of the device: %08x\n",
1336                                 info.hflags & HMNT2_DEVFLAGS);
1337                 }
1338         }
1339
1340         /*
1341          * Force local mount (disassociate all PFSs from their clusters).
1342          * Used primarily for debugging.
1343          */
1344         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1345
1346         /*
1347          * Lookup the mount point under the media-localized super-root.
1348          * Scanning hammer2_pfslist doesn't help us because it represents
1349          * PFS cluster ids which can aggregate several named PFSs together.
1350          *
1351          * cluster->pmp will incorrectly point to spmp and must be fixed
1352          * up later on.
1353          */
1354         hammer2_inode_lock(spmp->iroot, 0);
1355         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1356         lhc = hammer2_dirhash(label, strlen(label));
1357         chain = hammer2_chain_lookup(&parent, &key_next,
1358                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1359                                      &error, 0);
1360         while (chain) {
1361                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1362                     strcmp(label, chain->data->ipdata.filename) == 0) {
1363                         break;
1364                 }
1365                 chain = hammer2_chain_next(&parent, chain, &key_next,
1366                                             key_next,
1367                                             lhc + HAMMER2_DIRHASH_LOMASK,
1368                                             &error, 0);
1369         }
1370         if (parent) {
1371                 hammer2_chain_unlock(parent);
1372                 hammer2_chain_drop(parent);
1373         }
1374         hammer2_inode_unlock(spmp->iroot);
1375
1376         /*
1377          * PFS could not be found?
1378          */
1379         if (chain == NULL) {
1380                 if (error)
1381                         kprintf("hammer2_mount: PFS label I/O error\n");
1382                 else
1383                         kprintf("hammer2_mount: PFS label not found\n");
1384                 hammer2_unmount_helper(mp, NULL, hmp);
1385                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1386                 hammer2_vfs_unmount(mp, MNT_FORCE);
1387
1388                 return EINVAL;
1389         }
1390
1391         /*
1392          * Acquire the pmp structure (it should have already been allocated
1393          * via hammer2_update_pmps() so do not pass cluster in to add to
1394          * available chains).
1395          *
1396          * Check if the cluster has already been mounted.  A cluster can
1397          * only be mounted once, use null mounts to mount additional copies.
1398          */
1399         if (chain->error) {
1400                 kprintf("hammer2_mount: PFS label I/O error\n");
1401         } else {
1402                 ripdata = &chain->data->ipdata;
1403                 bref = chain->bref;
1404                 pmp = hammer2_pfsalloc(NULL, ripdata,
1405                                        bref.modify_tid, force_local);
1406         }
1407         hammer2_chain_unlock(chain);
1408         hammer2_chain_drop(chain);
1409
1410         /*
1411          * Finish the mount
1412          */
1413         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1414
1415         if (pmp->mp) {
1416                 kprintf("hammer2_mount: PFS already mounted!\n");
1417                 hammer2_unmount_helper(mp, NULL, hmp);
1418                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1419                 hammer2_vfs_unmount(mp, MNT_FORCE);
1420
1421                 return EBUSY;
1422         }
1423
1424         pmp->hflags = info.hflags;
1425         mp->mnt_flag |= MNT_LOCAL;
1426         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1427         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1428
1429         /*
1430          * required mount structure initializations
1431          */
1432         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1433         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1434
1435         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1436         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1437
1438         /*
1439          * Optional fields
1440          */
1441         mp->mnt_iosize_max = MAXPHYS;
1442
1443         /*
1444          * Connect up mount pointers.
1445          */
1446         hammer2_mount_helper(mp, pmp);
1447
1448         lockmgr(&hammer2_mntlk, LK_RELEASE);
1449
1450         /*
1451          * Finish setup
1452          */
1453         vfs_getnewfsid(mp);
1454         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1455         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1456         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1457
1458         if (path) {
1459                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1460                           MNAMELEN - 1, &size);
1461                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1462         } /* else root mount, already in there */
1463
1464         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1465         if (path) {
1466                 copyinstr(path, mp->mnt_stat.f_mntonname,
1467                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1468                           &size);
1469         } else {
1470                 /* root mount */
1471                 mp->mnt_stat.f_mntonname[0] = '/';
1472         }
1473
1474         /*
1475          * Initial statfs to prime mnt_stat.
1476          */
1477         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1478
1479         return 0;
1480 }
1481
1482 /*
1483  * Scan PFSs under the super-root and create hammer2_pfs structures.
1484  */
1485 static
1486 void
1487 hammer2_update_pmps(hammer2_dev_t *hmp)
1488 {
1489         const hammer2_inode_data_t *ripdata;
1490         hammer2_chain_t *parent;
1491         hammer2_chain_t *chain;
1492         hammer2_blockref_t bref;
1493         hammer2_dev_t *force_local;
1494         hammer2_pfs_t *spmp;
1495         hammer2_pfs_t *pmp;
1496         hammer2_key_t key_next;
1497         int error;
1498
1499         /*
1500          * Force local mount (disassociate all PFSs from their clusters).
1501          * Used primarily for debugging.
1502          */
1503         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1504
1505         /*
1506          * Lookup mount point under the media-localized super-root.
1507          *
1508          * cluster->pmp will incorrectly point to spmp and must be fixed
1509          * up later on.
1510          */
1511         spmp = hmp->spmp;
1512         hammer2_inode_lock(spmp->iroot, 0);
1513         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1514         chain = hammer2_chain_lookup(&parent, &key_next,
1515                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1516                                          &error, 0);
1517         while (chain) {
1518                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1519                         continue;
1520                 if (chain->error) {
1521                         kprintf("I/O error scanning PFS labels\n");
1522                 } else {
1523                         ripdata = &chain->data->ipdata;
1524                         bref = chain->bref;
1525
1526                         pmp = hammer2_pfsalloc(chain, ripdata,
1527                                                bref.modify_tid, force_local);
1528                 }
1529                 chain = hammer2_chain_next(&parent, chain, &key_next,
1530                                            key_next, HAMMER2_KEY_MAX,
1531                                            &error, 0);
1532         }
1533         if (parent) {
1534                 hammer2_chain_unlock(parent);
1535                 hammer2_chain_drop(parent);
1536         }
1537         hammer2_inode_unlock(spmp->iroot);
1538 }
1539
1540 static
1541 int
1542 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1543                 struct vnode *devvp, struct ucred *cred)
1544 {
1545         int error;
1546
1547         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1548                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1549                 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1550                 vn_unlock(devvp);
1551                 error = hammer2_recovery(hmp);
1552                 if (error == 0)
1553                         error |= hammer2_fixup_pfses(hmp);
1554                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1555                 if (error == 0) {
1556                         VOP_CLOSE(devvp, FREAD, NULL);
1557                         hmp->ronly = 0;
1558                 } else {
1559                         VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1560                 }
1561                 vn_unlock(devvp);
1562         } else {
1563                 error = 0;
1564         }
1565         return error;
1566 }
1567
1568 static
1569 int
1570 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1571 {
1572         hammer2_pfs_t *pmp;
1573         int flags;
1574         int error = 0;
1575
1576         pmp = MPTOPMP(mp);
1577
1578         if (pmp == NULL)
1579                 return(0);
1580
1581         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1582
1583         /*
1584          * If mount initialization proceeded far enough we must flush
1585          * its vnodes and sync the underlying mount points.  Three syncs
1586          * are required to fully flush the filesystem (freemap updates lag
1587          * by one flush, and one extra for safety).
1588          */
1589         if (mntflags & MNT_FORCE)
1590                 flags = FORCECLOSE;
1591         else
1592                 flags = 0;
1593         if (pmp->iroot) {
1594                 error = vflush(mp, 0, flags);
1595                 if (error)
1596                         goto failed;
1597                 hammer2_vfs_sync(mp, MNT_WAIT);
1598                 hammer2_vfs_sync(mp, MNT_WAIT);
1599                 hammer2_vfs_sync(mp, MNT_WAIT);
1600         }
1601
1602         /*
1603          * Cleanup the frontend support XOPS threads
1604          */
1605         hammer2_xop_helper_cleanup(pmp);
1606
1607         if (pmp->mp)
1608                 hammer2_unmount_helper(mp, pmp, NULL);
1609
1610         error = 0;
1611 failed:
1612         lockmgr(&hammer2_mntlk, LK_RELEASE);
1613
1614         return (error);
1615 }
1616
1617 /*
1618  * Mount helper, hook the system mount into our PFS.
1619  * The mount lock is held.
1620  *
1621  * We must bump the mount_count on related devices for any
1622  * mounted PFSs.
1623  */
1624 static
1625 void
1626 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1627 {
1628         hammer2_cluster_t *cluster;
1629         hammer2_chain_t *rchain;
1630         int i;
1631
1632         mp->mnt_data = (qaddr_t)pmp;
1633         pmp->mp = mp;
1634
1635         /*
1636          * After pmp->mp is set we have to adjust hmp->mount_count.
1637          */
1638         cluster = &pmp->iroot->cluster;
1639         for (i = 0; i < cluster->nchains; ++i) {
1640                 rchain = cluster->array[i].chain;
1641                 if (rchain == NULL)
1642                         continue;
1643                 ++rchain->hmp->mount_count;
1644         }
1645
1646         /*
1647          * Create missing Xop threads
1648          */
1649         hammer2_xop_helper_create(pmp);
1650 }
1651
1652 /*
1653  * Mount helper, unhook the system mount from our PFS.
1654  * The mount lock is held.
1655  *
1656  * If hmp is supplied a mount responsible for being the first to open
1657  * the block device failed and the block device and all PFSs using the
1658  * block device must be cleaned up.
1659  *
1660  * If pmp is supplied multiple devices might be backing the PFS and each
1661  * must be disconnected.  This might not be the last PFS using some of the
1662  * underlying devices.  Also, we have to adjust our hmp->mount_count
1663  * accounting for the devices backing the pmp which is now undergoing an
1664  * unmount.
1665  */
1666 static
1667 void
1668 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1669 {
1670         hammer2_cluster_t *cluster;
1671         hammer2_chain_t *rchain;
1672         struct vnode *devvp;
1673         int dumpcnt;
1674         int ronly;
1675         int i;
1676
1677         /*
1678          * If no device supplied this is a high-level unmount and we have to
1679          * to disconnect the mount, adjust mount_count, and locate devices
1680          * that might now have no mounts.
1681          */
1682         if (pmp) {
1683                 KKASSERT(hmp == NULL);
1684                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1685                 pmp->mp = NULL;
1686                 mp->mnt_data = NULL;
1687
1688                 /*
1689                  * After pmp->mp is cleared we have to account for
1690                  * mount_count.
1691                  */
1692                 cluster = &pmp->iroot->cluster;
1693                 for (i = 0; i < cluster->nchains; ++i) {
1694                         rchain = cluster->array[i].chain;
1695                         if (rchain == NULL)
1696                                 continue;
1697                         --rchain->hmp->mount_count;
1698                         /* scrapping hmp now may invalidate the pmp */
1699                 }
1700 again:
1701                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1702                         if (hmp->mount_count == 0) {
1703                                 hammer2_unmount_helper(NULL, NULL, hmp);
1704                                 goto again;
1705                         }
1706                 }
1707                 return;
1708         }
1709
1710         /*
1711          * Try to terminate the block device.  We can't terminate it if
1712          * there are still PFSs referencing it.
1713          */
1714         if (hmp->mount_count)
1715                 return;
1716
1717         /*
1718          * Decomission the network before we start messing with the
1719          * device and PFS.
1720          */
1721         hammer2_iocom_uninit(hmp);
1722
1723         hammer2_bulkfree_uninit(hmp);
1724         hammer2_pfsfree_scan(hmp, 0);
1725         hammer2_dev_exlock(hmp);        /* XXX order */
1726
1727         /*
1728          * Cycle the volume data lock as a safety (probably not needed any
1729          * more).  To ensure everything is out we need to flush at least
1730          * three times.  (1) The running of the sideq can dirty the
1731          * filesystem, (2) A normal flush can dirty the freemap, and
1732          * (3) ensure that the freemap is fully synchronized.
1733          *
1734          * The next mount's recovery scan can clean everything up but we want
1735          * to leave the filesystem in a 100% clean state on a normal unmount.
1736          */
1737 #if 0
1738         hammer2_voldata_lock(hmp);
1739         hammer2_voldata_unlock(hmp);
1740 #endif
1741
1742         /*
1743          * Flush whatever is left.  Unmounted but modified PFS's might still
1744          * have some dirty chains on them.
1745          */
1746         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1747         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1748
1749         if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1750                 hammer2_voldata_modify(hmp);
1751                 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1752                                             HAMMER2_FLUSH_ALL);
1753         }
1754         hammer2_chain_unlock(&hmp->fchain);
1755
1756         if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1757                 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1758                                             HAMMER2_FLUSH_ALL);
1759         }
1760         hammer2_chain_unlock(&hmp->vchain);
1761
1762         if ((hmp->vchain.flags | hmp->fchain.flags) &
1763             HAMMER2_CHAIN_FLUSH_MASK) {
1764                 kprintf("hammer2_unmount: chains left over "
1765                         "after final sync\n");
1766                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1767                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1768
1769                 if (hammer2_debug & 0x0010)
1770                         Debugger("entered debugger");
1771         }
1772
1773         hammer2_pfsfree_scan(hmp, 1);
1774
1775         KKASSERT(hmp->spmp == NULL);
1776
1777         /*
1778          * Finish up with the device vnode
1779          */
1780         if ((devvp = hmp->devvp) != NULL) {
1781                 ronly = hmp->ronly;
1782                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1783                 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1784                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1785                         ronly);
1786                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1787                 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1788                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1789                 hmp->devvp = NULL;
1790                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1791                 vn_unlock(devvp);
1792                 vrele(devvp);
1793                 devvp = NULL;
1794         }
1795
1796         /*
1797          * Clear vchain/fchain flags that might prevent final cleanup
1798          * of these chains.
1799          */
1800         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1801                 atomic_add_long(&hammer2_count_modified_chains, -1);
1802                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1803                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1804         }
1805         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1806                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1807         }
1808
1809         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1810                 atomic_add_long(&hammer2_count_modified_chains, -1);
1811                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1812                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1813         }
1814         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1815                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1816         }
1817
1818         /*
1819          * Final drop of embedded freemap root chain to
1820          * clean up fchain.core (fchain structure is not
1821          * flagged ALLOCATED so it is cleaned out and then
1822          * left to rot).
1823          */
1824         hammer2_chain_drop(&hmp->fchain);
1825
1826         /*
1827          * Final drop of embedded volume root chain to clean
1828          * up vchain.core (vchain structure is not flagged
1829          * ALLOCATED so it is cleaned out and then left to
1830          * rot).
1831          */
1832         dumpcnt = 50;
1833         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1);
1834         dumpcnt = 50;
1835         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1);
1836         hammer2_dev_unlock(hmp);
1837         hammer2_chain_drop(&hmp->vchain);
1838
1839         hammer2_io_cleanup(hmp, &hmp->iotree);
1840         if (hmp->iofree_count) {
1841                 kprintf("io_cleanup: %d I/O's left hanging\n",
1842                         hmp->iofree_count);
1843         }
1844
1845         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1846         kmalloc_destroy(&hmp->mchain);
1847         kfree(hmp, M_HAMMER2);
1848 }
1849
1850 int
1851 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1852                  ino_t ino, struct vnode **vpp)
1853 {
1854         hammer2_xop_lookup_t *xop;
1855         hammer2_pfs_t *pmp;
1856         hammer2_inode_t *ip;
1857         hammer2_tid_t inum;
1858         int error;
1859
1860         inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1861
1862         error = 0;
1863         pmp = MPTOPMP(mp);
1864
1865         /*
1866          * Easy if we already have it cached
1867          */
1868         ip = hammer2_inode_lookup(pmp, inum);
1869         if (ip) {
1870                 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1871                 *vpp = hammer2_igetv(ip, &error);
1872                 hammer2_inode_unlock(ip);
1873                 hammer2_inode_drop(ip);         /* from lookup */
1874
1875                 return error;
1876         }
1877
1878         /*
1879          * Otherwise we have to find the inode
1880          */
1881         xop = hammer2_xop_alloc(pmp->iroot, 0);
1882         xop->lhc = inum;
1883         hammer2_xop_start(&xop->head, &hammer2_lookup_desc);
1884         error = hammer2_xop_collect(&xop->head, 0);
1885
1886         if (error == 0)
1887                 ip = hammer2_inode_get(pmp, NULL, &xop->head, -1);
1888         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1889
1890         if (ip) {
1891                 *vpp = hammer2_igetv(ip, &error);
1892                 hammer2_inode_unlock(ip);
1893         } else {
1894                 *vpp = NULL;
1895                 error = ENOENT;
1896         }
1897         return (error);
1898 }
1899
1900 static
1901 int
1902 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1903 {
1904         hammer2_pfs_t *pmp;
1905         struct vnode *vp;
1906         int error;
1907
1908         pmp = MPTOPMP(mp);
1909         if (pmp->iroot == NULL) {
1910                 kprintf("hammer2 (%s): no root inode\n",
1911                         mp->mnt_stat.f_mntfromname);
1912                 *vpp = NULL;
1913                 return EINVAL;
1914         }
1915
1916         error = 0;
1917         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1918
1919         while (pmp->inode_tid == 0) {
1920                 hammer2_xop_ipcluster_t *xop;
1921                 const hammer2_inode_meta_t *meta;
1922
1923                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1924                 hammer2_xop_start(&xop->head, &hammer2_ipcluster_desc);
1925                 error = hammer2_xop_collect(&xop->head, 0);
1926
1927                 if (error == 0) {
1928                         meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta;
1929                         pmp->iroot->meta = *meta;
1930                         pmp->inode_tid = meta->pfs_inum + 1;
1931                         hammer2_xop_pdata(&xop->head);
1932                         /* meta invalid */
1933
1934                         if (pmp->inode_tid < HAMMER2_INODE_START)
1935                                 pmp->inode_tid = HAMMER2_INODE_START;
1936                         pmp->modify_tid =
1937                                 xop->head.cluster.focus->bref.modify_tid + 1;
1938 #if 0
1939                         kprintf("PFS: Starting inode %jd\n",
1940                                 (intmax_t)pmp->inode_tid);
1941                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1942                                 pmp->inode_tid, pmp->modify_tid);
1943 #endif
1944                         wakeup(&pmp->iroot);
1945
1946                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1947
1948                         /*
1949                          * Prime the mount info.
1950                          */
1951                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1952                         break;
1953                 }
1954
1955                 /*
1956                  * Loop, try again
1957                  */
1958                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1959                 hammer2_inode_unlock(pmp->iroot);
1960                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1961                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1962                 if (error == EINTR)
1963                         break;
1964         }
1965
1966         if (error) {
1967                 hammer2_inode_unlock(pmp->iroot);
1968                 *vpp = NULL;
1969         } else {
1970                 vp = hammer2_igetv(pmp->iroot, &error);
1971                 hammer2_inode_unlock(pmp->iroot);
1972                 *vpp = vp;
1973         }
1974
1975         return (error);
1976 }
1977
1978 /*
1979  * Filesystem status
1980  *
1981  * XXX incorporate ipdata->meta.inode_quota and data_quota
1982  */
1983 static
1984 int
1985 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1986 {
1987         hammer2_pfs_t *pmp;
1988         hammer2_dev_t *hmp;
1989         hammer2_blockref_t bref;
1990         struct statfs tmp;
1991         int i;
1992
1993         /*
1994          * NOTE: iroot might not have validated the cluster yet.
1995          */
1996         pmp = MPTOPMP(mp);
1997
1998         bzero(&tmp, sizeof(tmp));
1999
2000         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2001                 hmp = pmp->pfs_hmps[i];
2002                 if (hmp == NULL)
2003                         continue;
2004                 if (pmp->iroot->cluster.array[i].chain)
2005                         bref = pmp->iroot->cluster.array[i].chain->bref;
2006                 else
2007                         bzero(&bref, sizeof(bref));
2008
2009                 tmp.f_files = bref.embed.stats.inode_count;
2010                 tmp.f_ffree = 0;
2011                 tmp.f_blocks = hmp->voldata.allocator_size /
2012                                mp->mnt_vstat.f_bsize;
2013                 tmp.f_bfree = hmp->voldata.allocator_free /
2014                               mp->mnt_vstat.f_bsize;
2015                 tmp.f_bavail = tmp.f_bfree;
2016
2017                 if (cred && cred->cr_uid != 0) {
2018                         uint64_t adj;
2019
2020                         /* 5% */
2021                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2022                         tmp.f_blocks -= adj;
2023                         tmp.f_bfree -= adj;
2024                         tmp.f_bavail -= adj;
2025                 }
2026
2027                 mp->mnt_stat.f_blocks = tmp.f_blocks;
2028                 mp->mnt_stat.f_bfree = tmp.f_bfree;
2029                 mp->mnt_stat.f_bavail = tmp.f_bavail;
2030                 mp->mnt_stat.f_files = tmp.f_files;
2031                 mp->mnt_stat.f_ffree = tmp.f_ffree;
2032
2033                 *sbp = mp->mnt_stat;
2034         }
2035         return (0);
2036 }
2037
2038 static
2039 int
2040 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2041 {
2042         hammer2_pfs_t *pmp;
2043         hammer2_dev_t *hmp;
2044         hammer2_blockref_t bref;
2045         struct statvfs tmp;
2046         int i;
2047
2048         /*
2049          * NOTE: iroot might not have validated the cluster yet.
2050          */
2051         pmp = MPTOPMP(mp);
2052         bzero(&tmp, sizeof(tmp));
2053
2054         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2055                 hmp = pmp->pfs_hmps[i];
2056                 if (hmp == NULL)
2057                         continue;
2058                 if (pmp->iroot->cluster.array[i].chain)
2059                         bref = pmp->iroot->cluster.array[i].chain->bref;
2060                 else
2061                         bzero(&bref, sizeof(bref));
2062
2063                 tmp.f_files = bref.embed.stats.inode_count;
2064                 tmp.f_ffree = 0;
2065                 tmp.f_blocks = hmp->voldata.allocator_size /
2066                                mp->mnt_vstat.f_bsize;
2067                 tmp.f_bfree = hmp->voldata.allocator_free /
2068                               mp->mnt_vstat.f_bsize;
2069                 tmp.f_bavail = tmp.f_bfree;
2070
2071                 if (cred && cred->cr_uid != 0) {
2072                         uint64_t adj;
2073
2074                         /* 5% */
2075                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2076                         tmp.f_blocks -= adj;
2077                         tmp.f_bfree -= adj;
2078                         tmp.f_bavail -= adj;
2079                 }
2080
2081                 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2082                 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2083                 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2084                 mp->mnt_vstat.f_files = tmp.f_files;
2085                 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2086
2087                 *sbp = mp->mnt_vstat;
2088         }
2089         return (0);
2090 }
2091
2092 /*
2093  * Mount-time recovery (RW mounts)
2094  *
2095  * Updates to the free block table are allowed to lag flushes by one
2096  * transaction.  In case of a crash, then on a fresh mount we must do an
2097  * incremental scan of the last committed transaction id and make sure that
2098  * all related blocks have been marked allocated.
2099  *
2100  * The super-root topology and each PFS has its own transaction id domain,
2101  * so we must track PFS boundary transitions.
2102  */
2103 struct hammer2_recovery_elm {
2104         TAILQ_ENTRY(hammer2_recovery_elm) entry;
2105         hammer2_chain_t *chain;
2106         hammer2_tid_t sync_tid;
2107 };
2108
2109 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2110
2111 struct hammer2_recovery_info {
2112         struct hammer2_recovery_list list;
2113         hammer2_tid_t   mtid;
2114         int     depth;
2115 };
2116
2117 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2118                         hammer2_chain_t *parent,
2119                         struct hammer2_recovery_info *info,
2120                         hammer2_tid_t sync_tid);
2121
2122 #define HAMMER2_RECOVERY_MAXDEPTH       10
2123
2124 static
2125 int
2126 hammer2_recovery(hammer2_dev_t *hmp)
2127 {
2128         struct hammer2_recovery_info info;
2129         struct hammer2_recovery_elm *elm;
2130         hammer2_chain_t *parent;
2131         hammer2_tid_t sync_tid;
2132         hammer2_tid_t mirror_tid;
2133         int error;
2134
2135         hammer2_trans_init(hmp->spmp, 0);
2136
2137         sync_tid = hmp->voldata.freemap_tid;
2138         mirror_tid = hmp->voldata.mirror_tid;
2139
2140         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2141         if (sync_tid >= mirror_tid) {
2142                 kprintf(" no recovery needed\n");
2143         } else {
2144                 kprintf(" freemap recovery %016jx-%016jx\n",
2145                         sync_tid + 1, mirror_tid);
2146         }
2147
2148         TAILQ_INIT(&info.list);
2149         info.depth = 0;
2150         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2151         error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2152         hammer2_chain_lookup_done(parent);
2153
2154         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2155                 TAILQ_REMOVE(&info.list, elm, entry);
2156                 parent = elm->chain;
2157                 sync_tid = elm->sync_tid;
2158                 kfree(elm, M_HAMMER2);
2159
2160                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2161                 error |= hammer2_recovery_scan(hmp, parent, &info,
2162                                               hmp->voldata.freemap_tid);
2163                 hammer2_chain_unlock(parent);
2164                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
2165         }
2166
2167         hammer2_trans_done(hmp->spmp, 0);
2168
2169         return error;
2170 }
2171
2172 static
2173 int
2174 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2175                       struct hammer2_recovery_info *info,
2176                       hammer2_tid_t sync_tid)
2177 {
2178         const hammer2_inode_data_t *ripdata;
2179         hammer2_chain_t *chain;
2180         hammer2_blockref_t bref;
2181         int tmp_error;
2182         int rup_error;
2183         int error;
2184         int first;
2185
2186         /*
2187          * Adjust freemap to ensure that the block(s) are marked allocated.
2188          */
2189         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2190                 hammer2_freemap_adjust(hmp, &parent->bref,
2191                                        HAMMER2_FREEMAP_DORECOVER);
2192         }
2193
2194         /*
2195          * Check type for recursive scan
2196          */
2197         switch(parent->bref.type) {
2198         case HAMMER2_BREF_TYPE_VOLUME:
2199                 /* data already instantiated */
2200                 break;
2201         case HAMMER2_BREF_TYPE_INODE:
2202                 /*
2203                  * Must instantiate data for DIRECTDATA test and also
2204                  * for recursion.
2205                  */
2206                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2207                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2208                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2209                         /* not applicable to recovery scan */
2210                         hammer2_chain_unlock(parent);
2211                         return 0;
2212                 }
2213                 hammer2_chain_unlock(parent);
2214                 break;
2215         case HAMMER2_BREF_TYPE_INDIRECT:
2216                 /*
2217                  * Must instantiate data for recursion
2218                  */
2219                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2220                 hammer2_chain_unlock(parent);
2221                 break;
2222         case HAMMER2_BREF_TYPE_DIRENT:
2223         case HAMMER2_BREF_TYPE_DATA:
2224         case HAMMER2_BREF_TYPE_FREEMAP:
2225         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2226         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2227                 /* not applicable to recovery scan */
2228                 return 0;
2229                 break;
2230         default:
2231                 return HAMMER2_ERROR_BADBREF;
2232         }
2233
2234         /*
2235          * Defer operation if depth limit reached or if we are crossing a
2236          * PFS boundary.
2237          */
2238         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2239                 struct hammer2_recovery_elm *elm;
2240
2241                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2242                 elm->chain = parent;
2243                 elm->sync_tid = sync_tid;
2244                 hammer2_chain_ref(parent);
2245                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2246                 /* unlocked by caller */
2247
2248                 return(0);
2249         }
2250
2251
2252         /*
2253          * Recursive scan of the last flushed transaction only.  We are
2254          * doing this without pmp assignments so don't leave the chains
2255          * hanging around after we are done with them.
2256          *
2257          * error        Cumulative error this level only
2258          * rup_error    Cumulative error for recursion
2259          * tmp_error    Specific non-cumulative recursion error
2260          */
2261         chain = NULL;
2262         first = 1;
2263         rup_error = 0;
2264         error = 0;
2265
2266         for (;;) {
2267                 error |= hammer2_chain_scan(parent, &chain, &bref,
2268                                             &first,
2269                                             HAMMER2_LOOKUP_NODATA);
2270
2271                 /*
2272                  * Problem during scan or EOF
2273                  */
2274                 if (error)
2275                         break;
2276
2277                 /*
2278                  * If this is a leaf
2279                  */
2280                 if (chain == NULL) {
2281                         if (bref.mirror_tid > sync_tid) {
2282                                 hammer2_freemap_adjust(hmp, &bref,
2283                                                      HAMMER2_FREEMAP_DORECOVER);
2284                         }
2285                         continue;
2286                 }
2287
2288                 /*
2289                  * This may or may not be a recursive node.
2290                  */
2291                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2292                 if (bref.mirror_tid > sync_tid) {
2293                         ++info->depth;
2294                         tmp_error = hammer2_recovery_scan(hmp, chain,
2295                                                            info, sync_tid);
2296                         --info->depth;
2297                 } else {
2298                         tmp_error = 0;
2299                 }
2300
2301                 /*
2302                  * Flush the recovery at the PFS boundary to stage it for
2303                  * the final flush of the super-root topology.
2304                  */
2305                 if (tmp_error == 0 &&
2306                     (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2307                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2308                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2309                                              HAMMER2_FLUSH_ALL);
2310                 }
2311                 rup_error |= tmp_error;
2312         }
2313         return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2314 }
2315
2316 /*
2317  * This fixes up an error introduced in earlier H2 implementations where
2318  * moving a PFS inode into an indirect block wound up causing the
2319  * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2320  */
2321 static
2322 int
2323 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2324 {
2325         const hammer2_inode_data_t *ripdata;
2326         hammer2_chain_t *parent;
2327         hammer2_chain_t *chain;
2328         hammer2_key_t key_next;
2329         hammer2_pfs_t *spmp;
2330         int error;
2331
2332         error = 0;
2333
2334         /*
2335          * Lookup mount point under the media-localized super-root.
2336          *
2337          * cluster->pmp will incorrectly point to spmp and must be fixed
2338          * up later on.
2339          */
2340         spmp = hmp->spmp;
2341         hammer2_inode_lock(spmp->iroot, 0);
2342         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2343         chain = hammer2_chain_lookup(&parent, &key_next,
2344                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2345                                          &error, 0);
2346         while (chain) {
2347                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2348                         continue;
2349                 if (chain->error) {
2350                         kprintf("I/O error scanning PFS labels\n");
2351                         error |= chain->error;
2352                 } else if ((chain->bref.flags &
2353                             HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2354                         int error2;
2355
2356                         ripdata = &chain->data->ipdata;
2357                         hammer2_trans_init(hmp->spmp, 0);
2358                         error2 = hammer2_chain_modify(chain,
2359                                                       chain->bref.modify_tid,
2360                                                       0, 0);
2361                         if (error2 == 0) {
2362                                 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2363                                         ripdata->filename);
2364                                 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2365                         } else {
2366                                 error |= error2;
2367                         }
2368                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2369                                              HAMMER2_FLUSH_ALL);
2370                         hammer2_trans_done(hmp->spmp, 0);
2371                 }
2372                 chain = hammer2_chain_next(&parent, chain, &key_next,
2373                                            key_next, HAMMER2_KEY_MAX,
2374                                            &error, 0);
2375         }
2376         if (parent) {
2377                 hammer2_chain_unlock(parent);
2378                 hammer2_chain_drop(parent);
2379         }
2380         hammer2_inode_unlock(spmp->iroot);
2381
2382         return error;
2383 }
2384
2385 /*
2386  * Sync a mount point; this is called periodically on a per-mount basis from
2387  * the filesystem syncer, and whenever a user issues a sync.
2388  */
2389 int
2390 hammer2_vfs_sync(struct mount *mp, int waitfor)
2391 {
2392         hammer2_xop_flush_t *xop;
2393         struct hammer2_sync_info info;
2394         hammer2_inode_t *iroot;
2395         hammer2_pfs_t *pmp;
2396         int flags;
2397         int error;
2398
2399         pmp = MPTOPMP(mp);
2400         iroot = pmp->iroot;
2401         KKASSERT(iroot);
2402         KKASSERT(iroot->pmp == pmp);
2403
2404         /*
2405          * We can't acquire locks on existing vnodes while in a transaction
2406          * without risking a deadlock.  This assumes that vfsync() can be
2407          * called without the vnode locked (which it can in DragonFly).
2408          * Otherwise we'd have to implement a multi-pass or flag the lock
2409          * failures and retry.
2410          *
2411          * The reclamation code interlocks with the sync list's token
2412          * (by removing the vnode from the scan list) before unlocking
2413          * the inode, giving us time to ref the inode.
2414          */
2415         /*flags = VMSC_GETVP;*/
2416         flags = 0;
2417         if (waitfor & MNT_LAZY)
2418                 flags |= VMSC_ONEPASS;
2419
2420         /*
2421          * Flush vnodes individually using a normal transaction to avoid
2422          * stalling any concurrent operations.  This will flush the related
2423          * buffer cache buffers and inodes to the media.
2424          *
2425          * For efficiency do an async pass before making sure with a
2426          * synchronous pass on all related buffer cache buffers.
2427          */
2428         hammer2_trans_init(pmp, 0);
2429
2430         info.error = 0;
2431
2432         info.waitfor = MNT_NOWAIT;
2433         info.pass = 1;
2434         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2435
2436         /*
2437          * Now do two passes making sure we get everything.  The first pass
2438          * vfsync()s dirty vnodes.  The second pass waits for their I/O's
2439          * to finish and cleans up the dirty flag on the vnode.
2440          */
2441         info.pass = 1;
2442         info.waitfor = MNT_WAIT;
2443         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2444
2445         info.pass = 2;
2446         info.waitfor = MNT_WAIT;
2447         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2448
2449         /*
2450          * We must also run the sideq to handle any disconnected inodes
2451          * as the vnode scan will not see these.
2452          */
2453         hammer2_inode_run_sideq(pmp, 1);
2454         hammer2_trans_done(pmp, 0);
2455
2456         /*
2457          * Start our flush transaction and flush the root topology down to
2458          * the inodes, but not the inodes themselves (which we already flushed
2459          * above).  Any concurrent activity effecting inode contents will not
2460          *
2461          * The flush sequence will
2462          *
2463          * NOTE! It is still possible for the paging code to push pages
2464          *       out via a UIO_NOCOPY hammer2_vop_write() during the main
2465          *       flush.
2466          */
2467         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2468
2469         /*
2470          * sync dirty vnodes again while in the flush transaction.  This is
2471          * currently an expensive shim to makre sure the logical topology is
2472          * completely consistent before we flush the volume header.
2473          */
2474         info.pass = 1;
2475         info.waitfor = MNT_WAIT;
2476         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2477
2478         info.pass = 2;
2479         info.waitfor = MNT_WAIT;
2480         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2481
2482         /*
2483          * Use the XOP interface to concurrently flush all nodes to
2484          * synchronize the PFSROOT subtopology to the media.  A standard
2485          * end-of-scan ENOENT error indicates cluster sufficiency.
2486          *
2487          * Note that this flush will not be visible on crash recovery until
2488          * we flush the super-root topology in the next loop.
2489          *
2490          * XXX For now wait for all flushes to complete.
2491          */
2492         if (iroot) {
2493                 /*
2494                  * If unmounting try to flush everything including any
2495                  * sub-trees under inodes, just in case there is dangling
2496                  * modified data, as a safety.  Otherwise just flush up to
2497                  * the inodes in this stage.
2498                  */
2499                 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
2500                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2501                                                        HAMMER2_XOP_VOLHDR);
2502                 } else {
2503                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2504                                                        HAMMER2_XOP_INODE_STOP |
2505                                                        HAMMER2_XOP_VOLHDR);
2506                 }
2507                 hammer2_xop_start(&xop->head, &hammer2_inode_flush_desc);
2508                 error = hammer2_xop_collect(&xop->head,
2509                                             HAMMER2_XOP_COLLECT_WAITALL);
2510                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2511                 if (error == HAMMER2_ERROR_ENOENT)
2512                         error = 0;
2513                 else
2514                         error = hammer2_error_to_errno(error);
2515         } else {
2516                 error = 0;
2517         }
2518         hammer2_trans_done(pmp, 0);
2519
2520         return (error);
2521 }
2522
2523 /*
2524  * Sync passes.
2525  *
2526  * Note that we ignore the tranasction mtid we got above.  Instead,
2527  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2528  * transactions.
2529  *
2530  * WARNING! The frontend might be waiting on chnmem (limit_dirty_chains)
2531  * while holding a vnode locked.  When this situation occurs we cannot
2532  * safely test whether it is ok to clear the dirty bit on the vnode.
2533  * However, we can still flush the inode's topology.
2534  */
2535 static int
2536 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2537 {
2538         struct hammer2_sync_info *info = data;
2539         hammer2_inode_t *ip;
2540         int error;
2541
2542         /*
2543          * Degenerate cases.  Note that ip == NULL typically means the
2544          * syncer vnode itself and we don't want to vclrisdirty() in that
2545          * situation.
2546          */
2547         ip = VTOI(vp);
2548         if (ip == NULL) {
2549                 return(0);
2550         }
2551         if (vp->v_type == VNON || vp->v_type == VBAD) {
2552                 vclrisdirty(vp);
2553                 return(0);
2554         }
2555
2556         /*
2557          * Synchronize the buffer cche and inode meta-data to the backing
2558          * chain topology.
2559          *
2560          * vfsync is not necessarily synchronous, so it is best NOT to try
2561          * to flush the backing topology to media at this point.
2562          */
2563         hammer2_inode_ref(ip);
2564         if ((ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) ||
2565             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2566                 if (info->pass == 1)
2567                         vfsync(vp, info->waitfor, 1, NULL, NULL);
2568                 else
2569                         bio_track_wait(&vp->v_track_write, 0, 0);
2570         }
2571         if (info->pass == 2 && (vp->v_flag & VISDIRTY)) {
2572                 /*
2573                  * v_token is needed to interlock v_rbdirty_tree.
2574                  */
2575                 lwkt_gettoken(&vp->v_token);
2576                 hammer2_inode_lock(ip, 0);
2577                 hammer2_inode_chain_sync(ip);
2578                 hammer2_inode_chain_flush(ip);
2579                 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2580                                   HAMMER2_INODE_RESIZED |
2581                                   HAMMER2_INODE_DIRTYDATA)) == 0 &&
2582                     RB_EMPTY(&vp->v_rbdirty_tree) &&
2583                     !bio_track_active(&vp->v_track_write)) {
2584                         vclrisdirty(vp);
2585                 }
2586                 hammer2_inode_unlock(ip);
2587                 lwkt_reltoken(&vp->v_token);
2588         }
2589         hammer2_inode_drop(ip);
2590 #if 1
2591         error = 0;
2592         if (error)
2593                 info->error = error;
2594 #endif
2595         return(0);
2596 }
2597
2598 static
2599 int
2600 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2601 {
2602         hammer2_inode_t *ip;
2603
2604         KKASSERT(MAXFIDSZ >= 16);
2605         ip = VTOI(vp);
2606         fhp->fid_len = offsetof(struct fid, fid_data[16]);
2607         fhp->fid_ext = 0;
2608         ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2609         ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2610
2611         return 0;
2612 }
2613
2614 static
2615 int
2616 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2617                struct fid *fhp, struct vnode **vpp)
2618 {
2619         hammer2_pfs_t *pmp;
2620         hammer2_tid_t inum;
2621         int error;
2622
2623         pmp = MPTOPMP(mp);
2624         inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2625         if (vpp) {
2626                 if (inum == 1)
2627                         error = hammer2_vfs_root(mp, vpp);
2628                 else
2629                         error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2630         } else {
2631                 error = 0;
2632         }
2633         if (error)
2634                 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2635         return error;
2636 }
2637
2638 static
2639 int
2640 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2641                  int *exflagsp, struct ucred **credanonp)
2642 {
2643         hammer2_pfs_t *pmp;
2644         struct netcred *np;
2645         int error;
2646
2647         pmp = MPTOPMP(mp);
2648         np = vfs_export_lookup(mp, &pmp->export, nam);
2649         if (np) {
2650                 *exflagsp = np->netc_exflags;
2651                 *credanonp = &np->netc_anon;
2652                 error = 0;
2653         } else {
2654                 error = EACCES;
2655         }
2656         return error;
2657 }
2658
2659 /*
2660  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2661  * header into the HMP
2662  *
2663  * XXX read four volhdrs and use the one with the highest TID whos CRC
2664  *     matches.
2665  *
2666  * XXX check iCRCs.
2667  *
2668  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2669  *     nonexistant locations.
2670  *
2671  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2672  */
2673 static
2674 int
2675 hammer2_install_volume_header(hammer2_dev_t *hmp)
2676 {
2677         hammer2_volume_data_t *vd;
2678         struct buf *bp;
2679         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2680         int error_reported;
2681         int error;
2682         int valid;
2683         int i;
2684
2685         error_reported = 0;
2686         error = 0;
2687         valid = 0;
2688         bp = NULL;
2689
2690         /*
2691          * There are up to 4 copies of the volume header (syncs iterate
2692          * between them so there is no single master).  We don't trust the
2693          * volu_size field so we don't know precisely how large the filesystem
2694          * is, so depend on the OS to return an error if we go beyond the
2695          * block device's EOF.
2696          */
2697         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2698                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2699                               HAMMER2_VOLUME_BYTES, &bp);
2700                 if (error) {
2701                         brelse(bp);
2702                         bp = NULL;
2703                         continue;
2704                 }
2705
2706                 vd = (struct hammer2_volume_data *) bp->b_data;
2707                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2708                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2709                         brelse(bp);
2710                         bp = NULL;
2711                         continue;
2712                 }
2713
2714                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2715                         /* XXX: Reversed-endianness filesystem */
2716                         kprintf("hammer2: reverse-endian filesystem detected");
2717                         brelse(bp);
2718                         bp = NULL;
2719                         continue;
2720                 }
2721
2722                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2723                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2724                                       HAMMER2_VOLUME_ICRC0_SIZE);
2725                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2726                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2727                                        HAMMER2_VOLUME_ICRC1_SIZE);
2728                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2729                         kprintf("hammer2 volume header crc "
2730                                 "mismatch copy #%d %08x/%08x\n",
2731                                 i, crc0, crc);
2732                         error_reported = 1;
2733                         brelse(bp);
2734                         bp = NULL;
2735                         continue;
2736                 }
2737                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2738                         valid = 1;
2739                         hmp->voldata = *vd;
2740                         hmp->volhdrno = i;
2741                 }
2742                 brelse(bp);
2743                 bp = NULL;
2744         }
2745         if (valid) {
2746                 hmp->volsync = hmp->voldata;
2747                 hmp->free_reserved = hmp->voldata.allocator_size / 20;
2748                 error = 0;
2749                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2750                         kprintf("hammer2: using volume header #%d\n",
2751                                 hmp->volhdrno);
2752                 }
2753         } else {
2754                 error = EINVAL;
2755                 kprintf("hammer2: no valid volume headers found!\n");
2756         }
2757         return (error);
2758 }
2759
2760 /*
2761  * This handles hysteresis on regular file flushes.  Because the BIOs are
2762  * routed to a thread it is possible for an excessive number to build up
2763  * and cause long front-end stalls long before the runningbuffspace limit
2764  * is hit, so we implement hammer2_flush_pipe to control the
2765  * hysteresis.
2766  *
2767  * This is a particular problem when compression is used.
2768  */
2769 void
2770 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2771 {
2772         atomic_add_int(&pmp->count_lwinprog, 1);
2773 }
2774
2775 void
2776 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2777 {
2778         int lwinprog;
2779
2780         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2781         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2782             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2783                 atomic_clear_int(&pmp->count_lwinprog,
2784                                  HAMMER2_LWINPROG_WAITING);
2785                 wakeup(&pmp->count_lwinprog);
2786         }
2787         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2788             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2789                 atomic_clear_int(&pmp->count_lwinprog,
2790                                  HAMMER2_LWINPROG_WAITING0);
2791                 wakeup(&pmp->count_lwinprog);
2792         }
2793 }
2794
2795 void
2796 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2797 {
2798         int lwinprog;
2799         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2800                                     HAMMER2_LWINPROG_WAITING0;
2801
2802         for (;;) {
2803                 lwinprog = pmp->count_lwinprog;
2804                 cpu_ccfence();
2805                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2806                         break;
2807                 tsleep_interlock(&pmp->count_lwinprog, 0);
2808                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2809                 lwinprog = pmp->count_lwinprog;
2810                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2811                         break;
2812                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2813         }
2814 }
2815
2816 /*
2817  * Attempt to proactively fsync dirty vnodes if we have too many.  This
2818  * solves an issue where the kernel syncer thread can get seriously behind
2819  * when multiple user processes/threads are furiously modifying inodes.
2820  * This situation can occur on slow storage and is only limited by
2821  * kern.maxvnodes without the moderation code below.  It is made worse
2822  * when the device buffers underlying the modified inodes (which are clean)
2823  * get evicted before the flush can occur, forcing a re-read.
2824  *
2825  * We do not want sysads to feel that they have to torpedo kern.maxvnodes
2826  * to solve this problem, so we implement vfs.hammer2.limit_dirty_inodes
2827  * (per-mount-basis) and default it to something reasonable.
2828  */
2829 static void
2830 hammer2_pfs_moderate(hammer2_inode_t *ip, int always_moderate)
2831 {
2832         hammer2_pfs_t *pmp = ip->pmp;
2833         struct mount *mp = pmp->mp;
2834
2835         if (mp && vn_syncer_count(mp) > hammer2_limit_dirty_inodes) {
2836                 vn_syncer_one(mp);
2837         }
2838 }
2839
2840 /*
2841  * Manage excessive memory resource use for chain and related
2842  * structures.
2843  *
2844  * Called without any inode locks or transaction locks.  VNodes
2845  * might be locked by the kernel in the call stack.
2846  */
2847 void
2848 hammer2_pfs_memory_wait(hammer2_inode_t *ip, int always_moderate)
2849 {
2850         hammer2_pfs_t *pmp = ip->pmp;
2851         uint32_t waiting;
2852         uint32_t count;
2853         uint32_t limit;
2854 #if 0
2855         static int zzticks;
2856 #endif
2857
2858         /*
2859          * Moderate the number of dirty inodes
2860          */
2861         hammer2_pfs_moderate(ip, always_moderate);
2862
2863         /*
2864          * Atomic check condition and wait.  Also do an early speedup of
2865          * the syncer to try to avoid hitting the wait.
2866          */
2867         for (;;) {
2868                 waiting = pmp->inmem_dirty_chains;
2869                 cpu_ccfence();
2870                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2871
2872                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2873                 if (limit < hammer2_limit_dirty_chains)
2874                         limit = hammer2_limit_dirty_chains;
2875                 if (limit < 1000)
2876                         limit = 1000;
2877
2878 #if 0
2879                 if ((int)(ticks - zzticks) > hz) {
2880                         zzticks = ticks;
2881                         kprintf("count %ld %ld\n", count, limit);
2882                 }
2883 #endif
2884
2885                 /*
2886                  * Block if there are too many dirty chains present, wait
2887                  * for the flush to clean some out.
2888                  */
2889                 if (count > limit) {
2890                         hammer2_pfs_moderate(ip, always_moderate);
2891                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2892                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2893                                                waiting,
2894                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2895                                 if (ticks != pmp->speedup_ticks) {
2896                                         pmp->speedup_ticks = ticks;
2897                                         speedup_syncer(pmp->mp);
2898                                 }
2899                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2900                                        "chnmem", hz);
2901                         }
2902                         continue;       /* loop on success or fail */
2903                 }
2904
2905                 /*
2906                  * Try to start an early flush before we are forced to block.
2907                  */
2908                 if (count > limit * 5 / 10 &&
2909                     ticks != pmp->speedup_ticks) {
2910                         pmp->speedup_ticks = ticks;
2911                         speedup_syncer(pmp->mp);
2912                 }
2913                 break;
2914         }
2915 }
2916
2917 void
2918 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2919 {
2920         if (pmp) {
2921                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2922         }
2923 }
2924
2925 void
2926 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2927 {
2928         uint32_t waiting;
2929
2930         if (pmp) {
2931                 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1);
2932                 /* don't need --waiting to test flag */
2933                 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) {
2934                         atomic_clear_int(&pmp->inmem_dirty_chains,
2935                                          HAMMER2_DIRTYCHAIN_WAITING);
2936                         wakeup(&pmp->inmem_dirty_chains);
2937                 }
2938         }
2939 }
2940
2941 /*
2942  * Returns 0 if the filesystem has tons of free space
2943  * Returns 1 if the filesystem has less than 10% remaining
2944  * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
2945  */
2946 int
2947 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
2948 {
2949         hammer2_pfs_t *pmp;
2950         hammer2_dev_t *hmp;
2951         hammer2_off_t free_reserved;
2952         hammer2_off_t free_nominal;
2953         int i;
2954
2955         pmp = ip->pmp;
2956
2957         if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
2958                 free_reserved = HAMMER2_SEGSIZE;
2959                 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
2960                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2961                         hmp = pmp->pfs_hmps[i];
2962                         if (hmp == NULL)
2963                                 continue;
2964                         if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
2965                             pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
2966                                 continue;
2967
2968                         if (free_nominal > hmp->voldata.allocator_free)
2969                                 free_nominal = hmp->voldata.allocator_free;
2970                         if (free_reserved < hmp->free_reserved)
2971                                 free_reserved = hmp->free_reserved;
2972                 }
2973
2974                 /*
2975                  * SMP races ok
2976                  */
2977                 pmp->free_reserved = free_reserved;
2978                 pmp->free_nominal = free_nominal;
2979                 pmp->free_ticks = ticks;
2980         } else {
2981                 free_reserved = pmp->free_reserved;
2982                 free_nominal = pmp->free_nominal;
2983         }
2984         if (cred && cred->cr_uid != 0) {
2985                 if ((int64_t)(free_nominal - bytes) <
2986                     (int64_t)free_reserved) {
2987                         return 2;
2988                 }
2989         } else {
2990                 if ((int64_t)(free_nominal - bytes) <
2991                     (int64_t)free_reserved / 2) {
2992                         return 2;
2993                 }
2994         }
2995         if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
2996                 return 1;
2997         return 0;
2998 }
2999
3000 /*
3001  * Debugging
3002  */
3003 void
3004 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx,
3005                    u_int flags)
3006 {
3007         hammer2_chain_t *scan;
3008         hammer2_chain_t *parent;
3009
3010         --*countp;
3011         if (*countp == 0) {
3012                 kprintf("%*.*s...\n", tab, tab, "");
3013                 return;
3014         }
3015         if (*countp < 0)
3016                 return;
3017         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
3018                 tab, tab, "", pfx,
3019                 chain, chain->bref.type,
3020                 chain->bref.key, chain->bref.keybits,
3021                 chain->bref.mirror_tid);
3022
3023         kprintf("%*.*s      [%08x] (%s) refs=%d",
3024                 tab, tab, "",
3025                 chain->flags,
3026                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
3027                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
3028                 chain->refs);
3029
3030         parent = chain->parent;
3031         if (parent)
3032                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
3033                         tab, tab, "",
3034                         parent, parent->flags, parent->refs);
3035         if (RB_EMPTY(&chain->core.rbtree)) {
3036                 kprintf("\n");
3037         } else {
3038                 kprintf(" {\n");
3039                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) {
3040                         if ((scan->flags & flags) || flags == (u_int)-1) {
3041                                 hammer2_dump_chain(scan, tab + 4, countp, 'a',
3042                                                    flags);
3043                         }
3044                 }
3045                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
3046                         kprintf("%*.*s}(%s)\n", tab, tab, "",
3047                                 chain->data->ipdata.filename);
3048                 else
3049                         kprintf("%*.*s}\n", tab, tab, "");
3050         }
3051 }