sys/vfs/hammer2/hammer2_vfsops.c

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