sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         int error;
  71         int waitfor;
  72 };
  73
  74 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  75 TAILQ_HEAD(hammer2_pfslist, hammer2_pfs);
  76 static struct hammer2_mntlist hammer2_mntlist;
  77 static struct hammer2_pfslist hammer2_pfslist;
  78 static struct lock hammer2_mntlk;
  79
  80 int hammer2_debug;
  81 int hammer2_cluster_enable = 1;
  82 int hammer2_hardlink_enable = 1;
  83 int hammer2_flush_pipe = 100;
  84 int hammer2_synchronous_flush = 1;
  85 int hammer2_dio_count;
  86 long hammer2_limit_dirty_chains;
  87 long hammer2_count_modified_chains;
  88 long hammer2_iod_file_read;
  89 long hammer2_iod_meta_read;
  90 long hammer2_iod_indr_read;
  91 long hammer2_iod_fmap_read;
  92 long hammer2_iod_volu_read;
  93 long hammer2_iod_file_write;
  94 long hammer2_iod_file_wembed;
  95 long hammer2_iod_file_wzero;
  96 long hammer2_iod_file_wdedup;
  97 long hammer2_iod_meta_write;
  98 long hammer2_iod_indr_write;
  99 long hammer2_iod_fmap_write;
 100 long hammer2_iod_volu_write;
 101 long hammer2_ioa_file_read;
 102 long hammer2_ioa_meta_read;
 103 long hammer2_ioa_indr_read;
 104 long hammer2_ioa_fmap_read;
 105 long hammer2_ioa_volu_read;
 106 long hammer2_ioa_fmap_write;
 107 long hammer2_ioa_file_write;
 108 long hammer2_ioa_meta_write;
 109 long hammer2_ioa_indr_write;
 110 long hammer2_ioa_volu_write;
 111
 112 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 113 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 114                 "Buffer used for compression.");
 115
 116 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 117 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 118                 "Buffer used for decompression.");
 119
 120 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 121
 122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 123            &hammer2_debug, 0, "");
 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 125            &hammer2_cluster_enable, 0, "");
 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 127            &hammer2_hardlink_enable, 0, "");
 128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 129            &hammer2_flush_pipe, 0, "");
 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 131            &hammer2_synchronous_flush, 0, "");
 132 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 133            &hammer2_limit_dirty_chains, 0, "");
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 135            &hammer2_count_modified_chains, 0, "");
 136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 137            &hammer2_dio_count, 0, "");
 138
 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 140            &hammer2_iod_file_read, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 142            &hammer2_iod_meta_read, 0, "");
 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 144            &hammer2_iod_indr_read, 0, "");
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 146            &hammer2_iod_fmap_read, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 148            &hammer2_iod_volu_read, 0, "");
 149
 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 151            &hammer2_iod_file_write, 0, "");
 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 153            &hammer2_iod_file_wembed, 0, "");
 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 155            &hammer2_iod_file_wzero, 0, "");
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 157            &hammer2_iod_file_wdedup, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 159            &hammer2_iod_meta_write, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 161            &hammer2_iod_indr_write, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 163            &hammer2_iod_fmap_write, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 165            &hammer2_iod_volu_write, 0, "");
 166
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 168            &hammer2_ioa_file_read, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 170            &hammer2_ioa_meta_read, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 172            &hammer2_ioa_indr_read, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 174            &hammer2_ioa_fmap_read, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 176            &hammer2_ioa_volu_read, 0, "");
 177
 178 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 179            &hammer2_ioa_file_write, 0, "");
 180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 181            &hammer2_ioa_meta_write, 0, "");
 182 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 183            &hammer2_ioa_indr_write, 0, "");
 184 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 185            &hammer2_ioa_fmap_write, 0, "");
 186 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 187            &hammer2_ioa_volu_write, 0, "");
 188
 189 static int hammer2_vfs_init(struct vfsconf *conf);
 190 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 191 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 192                                 struct ucred *cred);
 193 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 194                                 struct vnode *, struct ucred *);
 195 static int hammer2_recovery(hammer2_dev_t *hmp);
 196 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 197 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 198 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 199                                 struct ucred *cred);
 200 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 201                                 struct ucred *cred);
 202 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 203                                 ino_t ino, struct vnode **vpp);
 204 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 205                                 struct fid *fhp, struct vnode **vpp);
 206 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 207 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 208                                 int *exflagsp, struct ucred **credanonp);
 209
 210 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 211 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 212
 213 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 214
 215 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 216 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 217                                 hammer2_dev_t *hmp);
 218
 219 /*
 220  * HAMMER2 vfs operations.
 221  */
 222 static struct vfsops hammer2_vfsops = {
 223         .vfs_init       = hammer2_vfs_init,
 224         .vfs_uninit     = hammer2_vfs_uninit,
 225         .vfs_sync       = hammer2_vfs_sync,
 226         .vfs_mount      = hammer2_vfs_mount,
 227         .vfs_unmount    = hammer2_vfs_unmount,
 228         .vfs_root       = hammer2_vfs_root,
 229         .vfs_statfs     = hammer2_vfs_statfs,
 230         .vfs_statvfs    = hammer2_vfs_statvfs,
 231         .vfs_vget       = hammer2_vfs_vget,
 232         .vfs_vptofh     = hammer2_vfs_vptofh,
 233         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 234         .vfs_checkexp   = hammer2_vfs_checkexp
 235 };
 236
 237 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 238
 239 VFS_SET(hammer2_vfsops, hammer2, 0);
 240 MODULE_VERSION(hammer2, 1);
 241
 242 static
 243 int
 244 hammer2_vfs_init(struct vfsconf *conf)
 245 {
 246         static struct objcache_malloc_args margs_read;
 247         static struct objcache_malloc_args margs_write;
 248         static struct objcache_malloc_args margs_vop;
 249
 250         int error;
 251
 252         error = 0;
 253
 254         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 255                 error = EINVAL;
 256         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 257                 error = EINVAL;
 258         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 259                 error = EINVAL;
 260
 261         if (error)
 262                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 263
 264         margs_read.objsize = 65536;
 265         margs_read.mtype = M_HAMMER2_DEBUFFER;
 266
 267         margs_write.objsize = 32768;
 268         margs_write.mtype = M_HAMMER2_CBUFFER;
 269
 270         margs_vop.objsize = sizeof(hammer2_xop_t);
 271         margs_vop.mtype = M_HAMMER2;
 272
 273         /*
 274          * Note thaht for the XOPS cache we want backing store allocations
 275          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 276          * confusion), so use the backing store function that does it.  This
 277          * means that initial XOPS objects are zerod but REUSED objects are
 278          * not.  So we are responsible for cleaning the object up sufficiently
 279          * for our needs before objcache_put()ing it back (typically just the
 280          * FIFO indices).
 281          */
 282         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 283                                 0, 1, NULL, NULL, NULL,
 284                                 objcache_malloc_alloc,
 285                                 objcache_malloc_free,
 286                                 &margs_read);
 287         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 288                                 0, 1, NULL, NULL, NULL,
 289                                 objcache_malloc_alloc,
 290                                 objcache_malloc_free,
 291                                 &margs_write);
 292         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 293                                 0, 1, NULL, NULL, NULL,
 294                                 objcache_malloc_alloc_zero,
 295                                 objcache_malloc_free,
 296                                 &margs_vop);
 297
 298
 299         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 300         TAILQ_INIT(&hammer2_mntlist);
 301         TAILQ_INIT(&hammer2_pfslist);
 302
 303         hammer2_limit_dirty_chains = desiredvnodes / 10;
 304
 305         return (error);
 306 }
 307
 308 static
 309 int
 310 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 311 {
 312         objcache_destroy(cache_buffer_read);
 313         objcache_destroy(cache_buffer_write);
 314         objcache_destroy(cache_xops);
 315         return 0;
 316 }
 317
 318 /*
 319  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 320  * mounts and the spmp structure for media (hmp) structures.
 321  *
 322  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 323  * transactions.  Note that synchronization does not use this field.
 324  * (typically frontend operations and synchronization cannot run on the
 325  * same PFS node at the same time).
 326  *
 327  * XXX check locking
 328  */
 329 hammer2_pfs_t *
 330 hammer2_pfsalloc(hammer2_chain_t *chain, const hammer2_inode_data_t *ripdata,
 331                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 332 {
 333         hammer2_inode_t *iroot;
 334         hammer2_pfs_t *pmp;
 335         int count;
 336         int i;
 337         int j;
 338
 339         /*
 340          * Locate or create the PFS based on the cluster id.  If ripdata
 341          * is NULL this is a spmp which is unique and is always allocated.
 342          *
 343          * If the device is mounted in local mode all PFSs are considered
 344          * independent and not part of any cluster (for debugging only).
 345          */
 346         if (ripdata) {
 347                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 348                         if (force_local != pmp->force_local)
 349                                 continue;
 350                         if (force_local == NULL &&
 351                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 352                                  sizeof(pmp->pfs_clid)) == 0) {
 353                                         break;
 354                         } else if (force_local && pmp->pfs_names[0] &&
 355                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 356                                         break;
 357                         }
 358                 }
 359         } else {
 360                 pmp = NULL;
 361         }
 362
 363         if (pmp == NULL) {
 364                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 365                 pmp->force_local = force_local;
 366                 hammer2_trans_manage_init(pmp);
 367                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 368                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 369                 lockinit(&pmp->lock, "pfslk", 0, 0);
 370                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 371                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 372                 spin_init(&pmp->xop_spin, "h2xop");
 373                 RB_INIT(&pmp->inum_tree);
 374                 TAILQ_INIT(&pmp->sideq);
 375                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 376
 377                 /*
 378                  * Distribute backend operations to threads
 379                  */
 380                 for (j = 0; j < HAMMER2_MAXCLUSTER; ++j)
 381                         TAILQ_INIT(&pmp->xopq[j]);
 382                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 383                         hammer2_xop_group_init(pmp, &pmp->xop_groups[j]);
 384
 385                 /*
 386                  * Save the last media transaction id for the flusher.  Set
 387                  * initial
 388                  */
 389                 if (ripdata)
 390                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 391                 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 392
 393                 /*
 394                  * The synchronization thread may start too early, make
 395                  * sure it stays frozen until we are ready to let it go.
 396                  * XXX
 397                  */
 398                 /*
 399                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 400                                          HAMMER2_THREAD_REMASTER;
 401                 */
 402         }
 403
 404         /*
 405          * Create the PFS's root inode.
 406          */
 407         if ((iroot = pmp->iroot) == NULL) {
 408                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 409                 pmp->iroot = iroot;
 410                 hammer2_inode_ref(iroot);
 411                 hammer2_inode_unlock(iroot);
 412         }
 413
 414         /*
 415          * Stop here if no chain is passed in.
 416          */
 417         if (chain == NULL)
 418                 goto done;
 419
 420         /*
 421          * When a chain is passed in we must add it to the PFS's root
 422          * inode, update pmp->pfs_types[], and update the syncronization
 423          * threads.
 424          *
 425          * When forcing local mode, mark the PFS as a MASTER regardless.
 426          *
 427          * At the moment empty spots can develop due to removals or failures.
 428          * Ultimately we want to re-fill these spots but doing so might
 429          * confused running code. XXX
 430          */
 431         hammer2_inode_ref(iroot);
 432         hammer2_mtx_ex(&iroot->lock);
 433         j = iroot->cluster.nchains;
 434
 435         kprintf("add PFS to pmp %p[%d]\n", pmp, j);
 436
 437         if (j == HAMMER2_MAXCLUSTER) {
 438                 kprintf("hammer2_mount: cluster full!\n");
 439                 /* XXX fatal error? */
 440         } else {
 441                 KKASSERT(chain->pmp == NULL);
 442                 chain->pmp = pmp;
 443                 hammer2_chain_ref(chain);
 444                 iroot->cluster.array[j].chain = chain;
 445                 if (force_local)
 446                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 447                 else
 448                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 449                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 450                 pmp->pfs_hmps[j] = chain->hmp;
 451
 452                 /*
 453                  * If the PFS is already mounted we must account
 454                  * for the mount_count here.
 455                  */
 456                 if (pmp->mp)
 457                         ++chain->hmp->mount_count;
 458
 459                 /*
 460                  * May have to fixup dirty chain tracking.  Previous
 461                  * pmp was NULL so nothing to undo.
 462                  */
 463                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 464                         hammer2_pfs_memory_inc(pmp);
 465                 ++j;
 466         }
 467         iroot->cluster.nchains = j;
 468
 469         /*
 470          * Update nmasters from any PFS inode which is part of the cluster.
 471          * It is possible that this will result in a value which is too
 472          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 473          * override this value later on.
 474          *
 475          * (This informs us of masters that might not currently be
 476          *  discoverable by this mount).
 477          */
 478         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 479                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 480         }
 481
 482         /*
 483          * Count visible masters.  Masters are usually added with
 484          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 485          * are more (XXX and must update the master inodes).
 486          */
 487         count = 0;
 488         for (i = 0; i < iroot->cluster.nchains; ++i) {
 489                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 490                         ++count;
 491         }
 492         if (pmp->pfs_nmasters < count)
 493                 pmp->pfs_nmasters = count;
 494
 495         /*
 496          * Create missing synchronization and support threads.
 497          *
 498          * Single-node masters (including snapshots) have nothing to
 499          * synchronize and do not require this thread.
 500          *
 501          * Multi-node masters or any number of soft masters, slaves, copy,
 502          * or other PFS types need the thread.
 503          *
 504          * Each thread is responsible for its particular cluster index.
 505          * We use independent threads so stalls or mismatches related to
 506          * any given target do not affect other targets.
 507          */
 508         for (i = 0; i < iroot->cluster.nchains; ++i) {
 509                 /*
 510                  * Single-node masters (including snapshots) have nothing
 511                  * to synchronize and will make direct xops support calls,
 512                  * thus they do not require this thread.
 513                  *
 514                  * Note that there can be thousands of snapshots.  We do not
 515                  * want to create thousands of threads.
 516                  */
 517                 if (pmp->pfs_nmasters <= 1 &&
 518                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 519                         continue;
 520                 }
 521
 522                 /*
 523                  * Sync support thread
 524                  */
 525                 if (pmp->sync_thrs[i].td == NULL) {
 526                         hammer2_thr_create(&pmp->sync_thrs[i], pmp,
 527                                            "h2nod", i, -1,
 528                                            hammer2_primary_sync_thread);
 529                 }
 530         }
 531
 532         /*
 533          * Create missing Xop threads
 534          */
 535         if (pmp->mp)
 536                 hammer2_xop_helper_create(pmp);
 537
 538         hammer2_mtx_unlock(&iroot->lock);
 539         hammer2_inode_drop(iroot);
 540 done:
 541         return pmp;
 542 }
 543
 544 /*
 545  * Destroy a PFS, typically only occurs after the last mount on a device
 546  * has gone away.
 547  */
 548 static void
 549 hammer2_pfsfree(hammer2_pfs_t *pmp)
 550 {
 551         hammer2_inode_t *iroot;
 552         int i;
 553         int j;
 554
 555         /*
 556          * Cleanup our reference on iroot.  iroot is (should) not be needed
 557          * by the flush code.
 558          */
 559         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 560
 561         iroot = pmp->iroot;
 562         if (iroot) {
 563                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 564                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 565                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 566                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 567                 }
 568 #if REPORT_REFS_ERRORS
 569                 if (pmp->iroot->refs != 1)
 570                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 571                                 pmp->iroot, pmp->iroot->refs);
 572 #else
 573                 KKASSERT(pmp->iroot->refs == 1);
 574 #endif
 575                 /* ref for pmp->iroot */
 576                 hammer2_inode_drop(pmp->iroot);
 577                 pmp->iroot = NULL;
 578         }
 579
 580         kmalloc_destroy(&pmp->mmsg);
 581         kmalloc_destroy(&pmp->minode);
 582
 583         kfree(pmp, M_HAMMER2);
 584 }
 585
 586 /*
 587  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 588  * empty is terminated and freed.
 589  *
 590  * XXX inefficient.
 591  */
 592 static void
 593 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
 594 {
 595         hammer2_pfs_t *pmp;
 596         hammer2_inode_t *iroot;
 597         hammer2_chain_t *rchain;
 598         int didfreeze;
 599         int i;
 600         int j;
 601
 602 again:
 603         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 604                 if ((iroot = pmp->iroot) == NULL)
 605                         continue;
 606                 if (hmp->spmp == pmp) {
 607                         kprintf("unmount hmp %p remove spmp %p\n",
 608                                 hmp, pmp);
 609                         hmp->spmp = NULL;
 610                 }
 611
 612                 /*
 613                  * Determine if this PFS is affected.  If it is we must
 614                  * freeze all management threads and lock its iroot.
 615                  *
 616                  * Freezing a management thread forces it idle, operations
 617                  * in-progress will be aborted and it will have to start
 618                  * over again when unfrozen, or exit if told to exit.
 619                  */
 620                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 621                         if (pmp->pfs_hmps[i] == hmp)
 622                                 break;
 623                 }
 624                 if (i != HAMMER2_MAXCLUSTER) {
 625                         /*
 626                          * Make sure all synchronization threads are locked
 627                          * down.
 628                          */
 629                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 630                                 if (pmp->pfs_hmps[i] == NULL)
 631                                         continue;
 632                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 633                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 634                                         hammer2_thr_freeze_async(
 635                                                 &pmp->xop_groups[j].thrs[i]);
 636                                 }
 637                         }
 638                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 639                                 if (pmp->pfs_hmps[i] == NULL)
 640                                         continue;
 641                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 642                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 643                                         hammer2_thr_freeze(
 644                                                 &pmp->xop_groups[j].thrs[i]);
 645                                 }
 646                         }
 647
 648                         /*
 649                          * Lock the inode and clean out matching chains.
 650                          * Note that we cannot use hammer2_inode_lock_*()
 651                          * here because that would attempt to validate the
 652                          * cluster that we are in the middle of ripping
 653                          * apart.
 654                          *
 655                          * WARNING! We are working directly on the inodes
 656                          *          embedded cluster.
 657                          */
 658                         hammer2_mtx_ex(&iroot->lock);
 659
 660                         /*
 661                          * Remove the chain from matching elements of the PFS.
 662                          */
 663                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 664                                 if (pmp->pfs_hmps[i] != hmp)
 665                                         continue;
 666                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 667                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 668                                         hammer2_thr_delete(
 669                                                 &pmp->xop_groups[j].thrs[i]);
 670                                 }
 671                                 rchain = iroot->cluster.array[i].chain;
 672                                 iroot->cluster.array[i].chain = NULL;
 673                                 pmp->pfs_types[i] = 0;
 674                                 if (pmp->pfs_names[i]) {
 675                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 676                                         pmp->pfs_names[i] = NULL;
 677                                 }
 678                                 if (rchain) {
 679                                         hammer2_chain_drop(rchain);
 680                                         /* focus hint */
 681                                         if (iroot->cluster.focus == rchain)
 682                                                 iroot->cluster.focus = NULL;
 683                                 }
 684                                 pmp->pfs_hmps[i] = NULL;
 685                         }
 686                         hammer2_mtx_unlock(&iroot->lock);
 687                         didfreeze = 1;  /* remaster, unfreeze down below */
 688                 } else {
 689                         didfreeze = 0;
 690                 }
 691
 692                 /*
 693                  * Cleanup trailing chains.  Gaps may remain.
 694                  */
 695                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 696                         if (pmp->pfs_hmps[i])
 697                                 break;
 698                 }
 699                 iroot->cluster.nchains = i + 1;
 700
 701                 /*
 702                  * If the PMP has no elements remaining we can destroy it.
 703                  * (this will transition management threads from frozen->exit).
 704                  */
 705                 if (iroot->cluster.nchains == 0) {
 706                         kprintf("unmount hmp %p last ref to PMP=%p\n",
 707                                 hmp, pmp);
 708                         hammer2_pfsfree(pmp);
 709                         goto again;
 710                 }
 711
 712                 /*
 713                  * If elements still remain we need to set the REMASTER
 714                  * flag and unfreeze it.
 715                  */
 716                 if (didfreeze) {
 717                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 718                                 if (pmp->pfs_hmps[i] == NULL)
 719                                         continue;
 720                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 721                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 722                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 723                                         hammer2_thr_remaster(
 724                                                 &pmp->xop_groups[j].thrs[i]);
 725                                         hammer2_thr_unfreeze(
 726                                                 &pmp->xop_groups[j].thrs[i]);
 727                                 }
 728                         }
 729                 }
 730         }
 731 }
 732
 733 /*
 734  * Mount or remount HAMMER2 fileystem from physical media
 735  *
 736  *      mountroot
 737  *              mp              mount point structure
 738  *              path            NULL
 739  *              data            <unused>
 740  *              cred            <unused>
 741  *
 742  *      mount
 743  *              mp              mount point structure
 744  *              path            path to mount point
 745  *              data            pointer to argument structure in user space
 746  *                      volume  volume path (device@LABEL form)
 747  *                      hflags  user mount flags
 748  *              cred            user credentials
 749  *
 750  * RETURNS:     0       Success
 751  *              !0      error number
 752  */
 753 static
 754 int
 755 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 756                   struct ucred *cred)
 757 {
 758         struct hammer2_mount_info info;
 759         hammer2_pfs_t *pmp;
 760         hammer2_pfs_t *spmp;
 761         hammer2_dev_t *hmp;
 762         hammer2_dev_t *force_local;
 763         hammer2_key_t key_next;
 764         hammer2_key_t key_dummy;
 765         hammer2_key_t lhc;
 766         struct vnode *devvp;
 767         struct nlookupdata nd;
 768         hammer2_chain_t *parent;
 769         hammer2_chain_t *chain;
 770         hammer2_cluster_t *cluster;
 771         const hammer2_inode_data_t *ripdata;
 772         hammer2_blockref_t bref;
 773         struct file *fp;
 774         char devstr[MNAMELEN];
 775         size_t size;
 776         size_t done;
 777         char *dev;
 778         char *label;
 779         int ronly = 1;
 780         int error;
 781         int cache_index;
 782         int i;
 783
 784         hmp = NULL;
 785         pmp = NULL;
 786         dev = NULL;
 787         label = NULL;
 788         devvp = NULL;
 789         cache_index = -1;
 790
 791         kprintf("hammer2_mount\n");
 792
 793         if (path == NULL) {
 794                 /*
 795                  * Root mount
 796                  */
 797                 bzero(&info, sizeof(info));
 798                 info.cluster_fd = -1;
 799                 ksnprintf(devstr, sizeof(devstr), "%s",
 800                           mp->mnt_stat.f_mntfromname);
 801                 kprintf("hammer2_mount: root '%s'\n", devstr);
 802         } else {
 803                 /*
 804                  * Non-root mount or updating a mount
 805                  */
 806                 error = copyin(data, &info, sizeof(info));
 807                 if (error)
 808                         return (error);
 809
 810                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 811                 if (error)
 812                         return (error);
 813         }
 814
 815         /* Extract device and label */
 816         dev = devstr;
 817         label = strchr(devstr, '@');
 818         if (label == NULL ||
 819             ((label + 1) - dev) > done) {
 820                 return (EINVAL);
 821         }
 822         *label = '\0';
 823         label++;
 824         if (*label == '\0')
 825                 return (EINVAL);
 826
 827         if (mp->mnt_flag & MNT_UPDATE) {
 828                 /*
 829                  * Update mount.  Note that pmp->iroot->cluster is
 830                  * an inode-embedded cluster and thus cannot be
 831                  * directly locked.
 832                  *
 833                  * XXX HAMMER2 needs to implement NFS export via
 834                  *     mountctl.
 835                  */
 836                 pmp = MPTOPMP(mp);
 837                 pmp->hflags = info.hflags;
 838                 cluster = &pmp->iroot->cluster;
 839                 for (i = 0; i < cluster->nchains; ++i) {
 840                         if (cluster->array[i].chain == NULL)
 841                                 continue;
 842                         hmp = cluster->array[i].chain->hmp;
 843                         devvp = hmp->devvp;
 844                         error = hammer2_remount(hmp, mp, path,
 845                                                 devvp, cred);
 846                         if (error)
 847                                 break;
 848                 }
 849
 850                 return error;
 851         }
 852
 853         /*
 854          * HMP device mount
 855          *
 856          * Lookup name and verify it refers to a block device.
 857          */
 858         if (path) {
 859                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 860                 if (error == 0)
 861                         error = nlookup(&nd);
 862                 if (error == 0)
 863                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 864                 nlookup_done(&nd);
 865         } else {
 866                 /* root mount */
 867                 cdev_t cdev = kgetdiskbyname(dev);
 868                 error = bdevvp(cdev, &devvp);
 869                 if (error)
 870                         kprintf("hammer2: cannot find '%s'\n", dev);
 871         }
 872
 873         if (error == 0) {
 874                 if (vn_isdisk(devvp, &error))
 875                         error = vfs_mountedon(devvp);
 876         }
 877
 878         /*
 879          * Determine if the device has already been mounted.  After this
 880          * check hmp will be non-NULL if we are doing the second or more
 881          * hammer2 mounts from the same device.
 882          */
 883         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 884         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 885                 if (hmp->devvp == devvp)
 886                         break;
 887         }
 888
 889         /*
 890          * Open the device if this isn't a secondary mount and construct
 891          * the H2 device mount (hmp).
 892          */
 893         if (hmp == NULL) {
 894                 hammer2_chain_t *schain;
 895                 hammer2_xid_t xid;
 896
 897                 if (error == 0 && vcount(devvp) > 0)
 898                         error = EBUSY;
 899
 900                 /*
 901                  * Now open the device
 902                  */
 903                 if (error == 0) {
 904                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 905                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 906                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 907                         if (error == 0) {
 908                                 error = VOP_OPEN(devvp,
 909                                                  ronly ? FREAD : FREAD | FWRITE,
 910                                                  FSCRED, NULL);
 911                         }
 912                         vn_unlock(devvp);
 913                 }
 914                 if (error && devvp) {
 915                         vrele(devvp);
 916                         devvp = NULL;
 917                 }
 918                 if (error) {
 919                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 920                         return error;
 921                 }
 922                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 923                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
 924                 hmp->ronly = ronly;
 925                 hmp->devvp = devvp;
 926                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
 927                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 928                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 929                 RB_INIT(&hmp->iotree);
 930                 spin_init(&hmp->io_spin, "hm2mount_io");
 931                 spin_init(&hmp->list_spin, "hm2mount_list");
 932                 TAILQ_INIT(&hmp->flushq);
 933
 934                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 935                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
 936
 937                 /*
 938                  * vchain setup. vchain.data is embedded.
 939                  * vchain.refs is initialized and will never drop to 0.
 940                  *
 941                  * NOTE! voldata is not yet loaded.
 942                  */
 943                 hmp->vchain.hmp = hmp;
 944                 hmp->vchain.refs = 1;
 945                 hmp->vchain.data = (void *)&hmp->voldata;
 946                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 947                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 948                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 949
 950                 hammer2_chain_core_init(&hmp->vchain);
 951                 /* hmp->vchain.u.xxx is left NULL */
 952
 953                 /*
 954                  * fchain setup.  fchain.data is embedded.
 955                  * fchain.refs is initialized and will never drop to 0.
 956                  *
 957                  * The data is not used but needs to be initialized to
 958                  * pass assertion muster.  We use this chain primarily
 959                  * as a placeholder for the freemap's top-level RBTREE
 960                  * so it does not interfere with the volume's topology
 961                  * RBTREE.
 962                  */
 963                 hmp->fchain.hmp = hmp;
 964                 hmp->fchain.refs = 1;
 965                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 966                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 967                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 968                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 969                 hmp->fchain.bref.methods =
 970                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 971                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 972
 973                 hammer2_chain_core_init(&hmp->fchain);
 974                 /* hmp->fchain.u.xxx is left NULL */
 975
 976                 /*
 977                  * Install the volume header and initialize fields from
 978                  * voldata.
 979                  */
 980                 error = hammer2_install_volume_header(hmp);
 981                 if (error) {
 982                         hammer2_unmount_helper(mp, NULL, hmp);
 983                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 984                         hammer2_vfs_unmount(mp, MNT_FORCE);
 985                         return error;
 986                 }
 987
 988                 /*
 989                  * Really important to get these right or flush will get
 990                  * confused.
 991                  */
 992                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
 993                 kprintf("alloc spmp %p tid %016jx\n",
 994                         hmp->spmp, hmp->voldata.mirror_tid);
 995                 spmp = hmp->spmp;
 996
 997                 /*
 998                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
 999                  * is inherited from the volume header.
1000                  */
1001                 xid = 0;
1002                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1003                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1004                 hmp->vchain.pmp = spmp;
1005                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1006                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1007                 hmp->fchain.pmp = spmp;
1008
1009                 /*
1010                  * First locate the super-root inode, which is key 0
1011                  * relative to the volume header's blockset.
1012                  *
1013                  * Then locate the root inode by scanning the directory keyspace
1014                  * represented by the label.
1015                  */
1016                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1017                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1018                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1019                                       &cache_index, 0);
1020                 hammer2_chain_lookup_done(parent);
1021                 if (schain == NULL) {
1022                         kprintf("hammer2_mount: invalid super-root\n");
1023                         hammer2_unmount_helper(mp, NULL, hmp);
1024                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1025                         hammer2_vfs_unmount(mp, MNT_FORCE);
1026                         return EINVAL;
1027                 }
1028                 if (schain->error) {
1029                         kprintf("hammer2_mount: error %s reading super-root\n",
1030                                 hammer2_error_str(schain->error));
1031                         hammer2_chain_unlock(schain);
1032                         hammer2_chain_drop(schain);
1033                         schain = NULL;
1034                         hammer2_unmount_helper(mp, NULL, hmp);
1035                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1036                         hammer2_vfs_unmount(mp, MNT_FORCE);
1037                         return EINVAL;
1038                 }
1039
1040                 /*
1041                  * The super-root always uses an inode_tid of 1 when
1042                  * creating PFSs.
1043                  */
1044                 spmp->inode_tid = 1;
1045                 spmp->modify_tid = schain->bref.modify_tid + 1;
1046
1047                 /*
1048                  * Sanity-check schain's pmp and finish initialization.
1049                  * Any chain belonging to the super-root topology should
1050                  * have a NULL pmp (not even set to spmp).
1051                  */
1052                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1053                 KKASSERT(schain->pmp == NULL);
1054                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1055
1056                 /*
1057                  * Replace the dummy spmp->iroot with a real one.  It's
1058                  * easier to just do a wholesale replacement than to try
1059                  * to update the chain and fixup the iroot fields.
1060                  *
1061                  * The returned inode is locked with the supplied cluster.
1062                  */
1063                 cluster = hammer2_cluster_from_chain(schain);
1064                 hammer2_inode_drop(spmp->iroot);
1065                 spmp->iroot = NULL;
1066                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1067                 spmp->spmp_hmp = hmp;
1068                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1069                 spmp->pfs_hmps[0] = hmp;
1070                 hammer2_inode_ref(spmp->iroot);
1071                 hammer2_inode_unlock(spmp->iroot);
1072                 hammer2_cluster_unlock(cluster);
1073                 hammer2_cluster_drop(cluster);
1074                 schain = NULL;
1075                 /* leave spmp->iroot with one ref */
1076
1077                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1078                         error = hammer2_recovery(hmp);
1079                         /* XXX do something with error */
1080                 }
1081                 hammer2_update_pmps(hmp);
1082                 hammer2_iocom_init(hmp);
1083
1084                 /*
1085                  * Ref the cluster management messaging descriptor.  The mount
1086                  * program deals with the other end of the communications pipe.
1087                  *
1088                  * Root mounts typically do not supply one.
1089                  */
1090                 if (info.cluster_fd >= 0) {
1091                         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1092                         if (fp) {
1093                                 hammer2_cluster_reconnect(hmp, fp);
1094                         } else {
1095                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1096                         }
1097                 }
1098         } else {
1099                 spmp = hmp->spmp;
1100                 if (info.hflags & HMNT2_DEVFLAGS) {
1101                         kprintf("hammer2: Warning: mount flags pertaining "
1102                                 "to the whole device may only be specified "
1103                                 "on the first mount of the device: %08x\n",
1104                                 info.hflags & HMNT2_DEVFLAGS);
1105                 }
1106         }
1107
1108         /*
1109          * Force local mount (disassociate all PFSs from their clusters).
1110          * Used primarily for debugging.
1111          */
1112         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1113
1114         /*
1115          * Lookup the mount point under the media-localized super-root.
1116          * Scanning hammer2_pfslist doesn't help us because it represents
1117          * PFS cluster ids which can aggregate several named PFSs together.
1118          *
1119          * cluster->pmp will incorrectly point to spmp and must be fixed
1120          * up later on.
1121          */
1122         hammer2_inode_lock(spmp->iroot, 0);
1123         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1124         lhc = hammer2_dirhash(label, strlen(label));
1125         chain = hammer2_chain_lookup(&parent, &key_next,
1126                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1127                                      &cache_index, 0);
1128         while (chain) {
1129                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1130                     strcmp(label, chain->data->ipdata.filename) == 0) {
1131                         break;
1132                 }
1133                 chain = hammer2_chain_next(&parent, chain, &key_next,
1134                                             key_next,
1135                                             lhc + HAMMER2_DIRHASH_LOMASK,
1136                                             &cache_index, 0);
1137         }
1138         if (parent) {
1139                 hammer2_chain_unlock(parent);
1140                 hammer2_chain_drop(parent);
1141         }
1142         hammer2_inode_unlock(spmp->iroot);
1143
1144         /*
1145          * PFS could not be found?
1146          */
1147         if (chain == NULL) {
1148                 kprintf("hammer2_mount: PFS label not found\n");
1149                 hammer2_unmount_helper(mp, NULL, hmp);
1150                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1151                 hammer2_vfs_unmount(mp, MNT_FORCE);
1152
1153                 return EINVAL;
1154         }
1155
1156         /*
1157          * Acquire the pmp structure (it should have already been allocated
1158          * via hammer2_update_pmps() so do not pass cluster in to add to
1159          * available chains).
1160          *
1161          * Check if the cluster has already been mounted.  A cluster can
1162          * only be mounted once, use null mounts to mount additional copies.
1163          */
1164         ripdata = &chain->data->ipdata;
1165         bref = chain->bref;
1166         pmp = hammer2_pfsalloc(NULL, ripdata, bref.modify_tid, force_local);
1167         hammer2_chain_unlock(chain);
1168         hammer2_chain_drop(chain);
1169
1170         if (pmp->mp) {
1171                 kprintf("hammer2_mount: PFS already mounted!\n");
1172                 hammer2_unmount_helper(mp, NULL, hmp);
1173                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1174                 hammer2_vfs_unmount(mp, MNT_FORCE);
1175
1176                 return EBUSY;
1177         }
1178
1179         /*
1180          * Finish the mount
1181          */
1182         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1183
1184         pmp->hflags = info.hflags;
1185         mp->mnt_flag = MNT_LOCAL;
1186         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1187         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1188
1189         /*
1190          * required mount structure initializations
1191          */
1192         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1193         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1194
1195         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1196         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1197
1198         /*
1199          * Optional fields
1200          */
1201         mp->mnt_iosize_max = MAXPHYS;
1202
1203         /*
1204          * Connect up mount pointers.
1205          */
1206         hammer2_mount_helper(mp, pmp);
1207
1208         lockmgr(&hammer2_mntlk, LK_RELEASE);
1209
1210         /*
1211          * Finish setup
1212          */
1213         vfs_getnewfsid(mp);
1214         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1215         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1216         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1217
1218         if (path) {
1219                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1220                           MNAMELEN - 1, &size);
1221                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1222         } /* else root mount, already in there */
1223
1224         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1225         if (path) {
1226                 copyinstr(path, mp->mnt_stat.f_mntonname,
1227                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1228                           &size);
1229         } else {
1230                 /* root mount */
1231                 mp->mnt_stat.f_mntonname[0] = '/';
1232         }
1233
1234         /*
1235          * Initial statfs to prime mnt_stat.
1236          */
1237         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1238
1239         return 0;
1240 }
1241
1242 /*
1243  * Scan PFSs under the super-root and create hammer2_pfs structures.
1244  */
1245 static
1246 void
1247 hammer2_update_pmps(hammer2_dev_t *hmp)
1248 {
1249         const hammer2_inode_data_t *ripdata;
1250         hammer2_chain_t *parent;
1251         hammer2_chain_t *chain;
1252         hammer2_blockref_t bref;
1253         hammer2_dev_t *force_local;
1254         hammer2_pfs_t *spmp;
1255         hammer2_pfs_t *pmp;
1256         hammer2_key_t key_next;
1257         int cache_index = -1;
1258
1259         /*
1260          * Force local mount (disassociate all PFSs from their clusters).
1261          * Used primarily for debugging.
1262          */
1263         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1264
1265         /*
1266          * Lookup mount point under the media-localized super-root.
1267          *
1268          * cluster->pmp will incorrectly point to spmp and must be fixed
1269          * up later on.
1270          */
1271         spmp = hmp->spmp;
1272         hammer2_inode_lock(spmp->iroot, 0);
1273         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1274         chain = hammer2_chain_lookup(&parent, &key_next,
1275                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1276                                          &cache_index, 0);
1277         while (chain) {
1278                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1279                         continue;
1280                 ripdata = &chain->data->ipdata;
1281                 bref = chain->bref;
1282                 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1283
1284                 pmp = hammer2_pfsalloc(chain, ripdata,
1285                                        bref.modify_tid, force_local);
1286                 chain = hammer2_chain_next(&parent, chain, &key_next,
1287                                            key_next, HAMMER2_KEY_MAX,
1288                                            &cache_index, 0);
1289         }
1290         if (parent) {
1291                 hammer2_chain_unlock(parent);
1292                 hammer2_chain_drop(parent);
1293         }
1294         hammer2_inode_unlock(spmp->iroot);
1295 }
1296
1297 static
1298 int
1299 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1300                 struct vnode *devvp, struct ucred *cred)
1301 {
1302         int error;
1303
1304         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1305                 error = hammer2_recovery(hmp);
1306         } else {
1307                 error = 0;
1308         }
1309         return error;
1310 }
1311
1312 static
1313 int
1314 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1315 {
1316         hammer2_pfs_t *pmp;
1317         int flags;
1318         int error = 0;
1319
1320         pmp = MPTOPMP(mp);
1321
1322         if (pmp == NULL)
1323                 return(0);
1324
1325         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1326
1327         /*
1328          * If mount initialization proceeded far enough we must flush
1329          * its vnodes and sync the underlying mount points.  Three syncs
1330          * are required to fully flush the filesystem (freemap updates lag
1331          * by one flush, and one extra for safety).
1332          */
1333         if (mntflags & MNT_FORCE)
1334                 flags = FORCECLOSE;
1335         else
1336                 flags = 0;
1337         if (pmp->iroot) {
1338                 error = vflush(mp, 0, flags);
1339                 if (error)
1340                         goto failed;
1341                 hammer2_vfs_sync(mp, MNT_WAIT);
1342                 hammer2_vfs_sync(mp, MNT_WAIT);
1343                 hammer2_vfs_sync(mp, MNT_WAIT);
1344         }
1345
1346         /*
1347          * Cleanup the frontend support XOPS threads
1348          */
1349         hammer2_xop_helper_cleanup(pmp);
1350
1351         /*
1352          * Cleanup our reference on ihidden.
1353          */
1354         if (pmp->ihidden) {
1355                 hammer2_inode_drop(pmp->ihidden);
1356                 pmp->ihidden = NULL;
1357         }
1358         if (pmp->mp)
1359                 hammer2_unmount_helper(mp, pmp, NULL);
1360
1361         error = 0;
1362 failed:
1363         lockmgr(&hammer2_mntlk, LK_RELEASE);
1364
1365         return (error);
1366 }
1367
1368 /*
1369  * Mount helper, hook the system mount into our PFS.
1370  * The mount lock is held.
1371  *
1372  * We must bump the mount_count on related devices for any
1373  * mounted PFSs.
1374  */
1375 static
1376 void
1377 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1378 {
1379         hammer2_cluster_t *cluster;
1380         hammer2_chain_t *rchain;
1381         int i;
1382
1383         mp->mnt_data = (qaddr_t)pmp;
1384         pmp->mp = mp;
1385
1386         /*
1387          * After pmp->mp is set we have to adjust hmp->mount_count.
1388          */
1389         cluster = &pmp->iroot->cluster;
1390         for (i = 0; i < cluster->nchains; ++i) {
1391                 rchain = cluster->array[i].chain;
1392                 if (rchain == NULL)
1393                         continue;
1394                 ++rchain->hmp->mount_count;
1395                 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1396                         rchain->hmp, rchain->hmp->mount_count);
1397         }
1398
1399         /*
1400          * Create missing Xop threads
1401          */
1402         hammer2_xop_helper_create(pmp);
1403 }
1404
1405 /*
1406  * Mount helper, unhook the system mount from our PFS.
1407  * The mount lock is held.
1408  *
1409  * If hmp is supplied a mount responsible for being the first to open
1410  * the block device failed and the block device and all PFSs using the
1411  * block device must be cleaned up.
1412  *
1413  * If pmp is supplied multiple devices might be backing the PFS and each
1414  * must be disconnect.  This might not be the last PFS using some of the
1415  * underlying devices.  Also, we have to adjust our hmp->mount_count
1416  * accounting for the devices backing the pmp which is now undergoing an
1417  * unmount.
1418  */
1419 static
1420 void
1421 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1422 {
1423         hammer2_cluster_t *cluster;
1424         hammer2_chain_t *rchain;
1425         struct vnode *devvp;
1426         int dumpcnt;
1427         int ronly = 0;
1428         int i;
1429
1430         /*
1431          * If no device supplied this is a high-level unmount and we have to
1432          * to disconnect the mount, adjust mount_count, and locate devices
1433          * that might now have no mounts.
1434          */
1435         if (pmp) {
1436                 KKASSERT(hmp == NULL);
1437                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1438                 pmp->mp = NULL;
1439                 mp->mnt_data = NULL;
1440
1441                 /*
1442                  * After pmp->mp is cleared we have to account for
1443                  * mount_count.
1444                  */
1445                 cluster = &pmp->iroot->cluster;
1446                 for (i = 0; i < cluster->nchains; ++i) {
1447                         rchain = cluster->array[i].chain;
1448                         if (rchain == NULL)
1449                                 continue;
1450                         --rchain->hmp->mount_count;
1451                         kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1452                                 rchain->hmp, rchain->hmp->mount_count);
1453                         /* scrapping hmp now may invalidate the pmp */
1454                 }
1455 again:
1456                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1457                         if (hmp->mount_count == 0) {
1458                                 hammer2_unmount_helper(NULL, NULL, hmp);
1459                                 goto again;
1460                         }
1461                 }
1462                 return;
1463         }
1464
1465         /*
1466          * Try to terminate the block device.  We can't terminate it if
1467          * there are still PFSs referencing it.
1468          */
1469         kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1470                 hmp, hmp->mount_count);
1471         if (hmp->mount_count)
1472                 return;
1473
1474         hammer2_pfsfree_scan(hmp);
1475         hammer2_dev_exlock(hmp);        /* XXX order */
1476
1477         /*
1478          * Cycle the volume data lock as a safety (probably not needed any
1479          * more).  To ensure everything is out we need to flush at least
1480          * three times.  (1) The running of the sideq can dirty the
1481          * filesystem, (2) A normal flush can dirty the freemap, and
1482          * (3) ensure that the freemap is fully synchronized.
1483          *
1484          * The next mount's recovery scan can clean everything up but we want
1485          * to leave the filesystem in a 100% clean state on a normal unmount.
1486          */
1487 #if 0
1488         hammer2_voldata_lock(hmp);
1489         hammer2_voldata_unlock(hmp);
1490 #endif
1491         hammer2_iocom_uninit(hmp);
1492
1493         if ((hmp->vchain.flags | hmp->fchain.flags) &
1494             HAMMER2_CHAIN_FLUSH_MASK) {
1495                 kprintf("hammer2_unmount: chains left over "
1496                         "after final sync\n");
1497                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1498                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1499
1500                 if (hammer2_debug & 0x0010)
1501                         Debugger("entered debugger");
1502         }
1503
1504         KKASSERT(hmp->spmp == NULL);
1505
1506         /*
1507          * Finish up with the device vnode
1508          */
1509         if ((devvp = hmp->devvp) != NULL) {
1510                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1511                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1512                 hmp->devvp = NULL;
1513                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1514                 vn_unlock(devvp);
1515                 vrele(devvp);
1516                 devvp = NULL;
1517         }
1518
1519         /*
1520          * Clear vchain/fchain flags that might prevent final cleanup
1521          * of these chains.
1522          */
1523         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1524                 atomic_add_long(&hammer2_count_modified_chains, -1);
1525                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1526                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1527         }
1528         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1529                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1530         }
1531
1532         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1533                 atomic_add_long(&hammer2_count_modified_chains, -1);
1534                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1535                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1536         }
1537         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1538                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1539         }
1540
1541         /*
1542          * Final drop of embedded freemap root chain to
1543          * clean up fchain.core (fchain structure is not
1544          * flagged ALLOCATED so it is cleaned out and then
1545          * left to rot).
1546          */
1547         hammer2_chain_drop(&hmp->fchain);
1548
1549         /*
1550          * Final drop of embedded volume root chain to clean
1551          * up vchain.core (vchain structure is not flagged
1552          * ALLOCATED so it is cleaned out and then left to
1553          * rot).
1554          */
1555         dumpcnt = 50;
1556         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1557         dumpcnt = 50;
1558         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1559         hammer2_dev_unlock(hmp);
1560         hammer2_chain_drop(&hmp->vchain);
1561
1562         hammer2_io_cleanup(hmp, &hmp->iotree);
1563         if (hmp->iofree_count) {
1564                 kprintf("io_cleanup: %d I/O's left hanging\n",
1565                         hmp->iofree_count);
1566         }
1567
1568         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1569         kmalloc_destroy(&hmp->mchain);
1570         kfree(hmp, M_HAMMER2);
1571 }
1572
1573 static
1574 int
1575 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1576              ino_t ino, struct vnode **vpp)
1577 {
1578         kprintf("hammer2_vget\n");
1579         return (EOPNOTSUPP);
1580 }
1581
1582 static
1583 int
1584 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1585 {
1586         hammer2_pfs_t *pmp;
1587         int error;
1588         struct vnode *vp;
1589
1590         pmp = MPTOPMP(mp);
1591         if (pmp->iroot == NULL) {
1592                 *vpp = NULL;
1593                 return EINVAL;
1594         }
1595
1596         error = 0;
1597         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1598
1599         while (pmp->inode_tid == 0) {
1600                 hammer2_xop_ipcluster_t *xop;
1601                 hammer2_inode_meta_t *meta;
1602
1603                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1604                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1605                 error = hammer2_xop_collect(&xop->head, 0);
1606
1607                 if (error == 0) {
1608                         meta = &xop->head.cluster.focus->data->ipdata.meta;
1609                         pmp->iroot->meta = *meta;
1610                         pmp->inode_tid = meta->pfs_inum + 1;
1611                         if (pmp->inode_tid < HAMMER2_INODE_START)
1612                                 pmp->inode_tid = HAMMER2_INODE_START;
1613                         pmp->modify_tid =
1614                                 xop->head.cluster.focus->bref.modify_tid + 1;
1615                         kprintf("PFS: Starting inode %jd\n",
1616                                 (intmax_t)pmp->inode_tid);
1617                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1618                                 pmp->inode_tid, pmp->modify_tid);
1619                         wakeup(&pmp->iroot);
1620
1621                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1622
1623                         /*
1624                          * Prime the mount info.
1625                          */
1626                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1627
1628                         /*
1629                          * With the cluster operational, check for and
1630                          * install ihidden if needed.  The install_hidden
1631                          * code needs to get a transaction so we must unlock
1632                          * iroot around it.
1633                          *
1634                          * This is only applicable PFS mounts, there is no
1635                          * hidden directory in the spmp.
1636                          */
1637                         hammer2_inode_unlock(pmp->iroot);
1638                         hammer2_inode_install_hidden(pmp);
1639                         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1640
1641                         break;
1642                 }
1643
1644                 /*
1645                  * Loop, try again
1646                  */
1647                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1648                 hammer2_inode_unlock(pmp->iroot);
1649                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1650                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1651                 if (error == EINTR)
1652                         break;
1653         }
1654
1655         if (error) {
1656                 hammer2_inode_unlock(pmp->iroot);
1657                 *vpp = NULL;
1658         } else {
1659                 vp = hammer2_igetv(pmp->iroot, &error);
1660                 hammer2_inode_unlock(pmp->iroot);
1661                 *vpp = vp;
1662         }
1663
1664         return (error);
1665 }
1666
1667 /*
1668  * Filesystem status
1669  *
1670  * XXX incorporate ipdata->meta.inode_quota and data_quota
1671  */
1672 static
1673 int
1674 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1675 {
1676         hammer2_pfs_t *pmp;
1677         hammer2_dev_t *hmp;
1678         hammer2_blockref_t bref;
1679         int i;
1680
1681         /*
1682          * NOTE: iroot might not have validated the cluster yet.
1683          */
1684         pmp = MPTOPMP(mp);
1685
1686         mp->mnt_stat.f_files = 0;
1687         mp->mnt_stat.f_ffree = 0;
1688         mp->mnt_stat.f_blocks = 0;
1689         mp->mnt_stat.f_bfree = 0;
1690         mp->mnt_stat.f_bavail = 0;
1691
1692         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1693                 hmp = pmp->pfs_hmps[i];
1694                 if (hmp == NULL)
1695                         continue;
1696                 if (pmp->iroot->cluster.array[i].chain)
1697                         bref = pmp->iroot->cluster.array[i].chain->bref;
1698                 else
1699                         bzero(&bref, sizeof(bref));
1700
1701                 mp->mnt_stat.f_files = bref.inode_count;
1702                 mp->mnt_stat.f_ffree = 0;
1703                 mp->mnt_stat.f_blocks = (bref.data_count +
1704                                          hmp->voldata.allocator_free) /
1705                                         mp->mnt_vstat.f_bsize;
1706                 mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free /
1707                                         mp->mnt_vstat.f_bsize;
1708                 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1709
1710                 *sbp = mp->mnt_stat;
1711         }
1712         return (0);
1713 }
1714
1715 static
1716 int
1717 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1718 {
1719         hammer2_pfs_t *pmp;
1720         hammer2_dev_t *hmp;
1721         hammer2_blockref_t bref;
1722         int i;
1723
1724         /*
1725          * NOTE: iroot might not have validated the cluster yet.
1726          */
1727         pmp = MPTOPMP(mp);
1728
1729         mp->mnt_vstat.f_bsize = 0;
1730         mp->mnt_vstat.f_files = 0;
1731         mp->mnt_vstat.f_ffree = 0;
1732         mp->mnt_vstat.f_blocks = 0;
1733         mp->mnt_vstat.f_bfree = 0;
1734         mp->mnt_vstat.f_bavail = 0;
1735
1736         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1737                 hmp = pmp->pfs_hmps[i];
1738                 if (hmp == NULL)
1739                         continue;
1740                 if (pmp->iroot->cluster.array[i].chain)
1741                         bref = pmp->iroot->cluster.array[i].chain->bref;
1742                 else
1743                         bzero(&bref, sizeof(bref));
1744
1745                 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1746                 mp->mnt_vstat.f_files = bref.inode_count;
1747                 mp->mnt_vstat.f_ffree = 0;
1748                 mp->mnt_vstat.f_blocks = (bref.data_count +
1749                                          hmp->voldata.allocator_free) /
1750                                         mp->mnt_vstat.f_bsize;
1751                 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1752                                         mp->mnt_vstat.f_bsize;
1753                 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1754
1755                 *sbp = mp->mnt_vstat;
1756         }
1757         return (0);
1758 }
1759
1760 /*
1761  * Mount-time recovery (RW mounts)
1762  *
1763  * Updates to the free block table are allowed to lag flushes by one
1764  * transaction.  In case of a crash, then on a fresh mount we must do an
1765  * incremental scan of the last committed transaction id and make sure that
1766  * all related blocks have been marked allocated.
1767  *
1768  * The super-root topology and each PFS has its own transaction id domain,
1769  * so we must track PFS boundary transitions.
1770  */
1771 struct hammer2_recovery_elm {
1772         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1773         hammer2_chain_t *chain;
1774         hammer2_tid_t sync_tid;
1775 };
1776
1777 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1778
1779 struct hammer2_recovery_info {
1780         struct hammer2_recovery_list list;
1781         hammer2_tid_t   mtid;
1782         int     depth;
1783 };
1784
1785 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
1786                         hammer2_chain_t *parent,
1787                         struct hammer2_recovery_info *info,
1788                         hammer2_tid_t sync_tid);
1789
1790 #define HAMMER2_RECOVERY_MAXDEPTH       10
1791
1792 static
1793 int
1794 hammer2_recovery(hammer2_dev_t *hmp)
1795 {
1796         struct hammer2_recovery_info info;
1797         struct hammer2_recovery_elm *elm;
1798         hammer2_chain_t *parent;
1799         hammer2_tid_t sync_tid;
1800         hammer2_tid_t mirror_tid;
1801         int error;
1802         int cumulative_error = 0;
1803
1804         hammer2_trans_init(hmp->spmp, 0);
1805
1806         sync_tid = hmp->voldata.freemap_tid;
1807         mirror_tid = hmp->voldata.mirror_tid;
1808
1809         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
1810         if (sync_tid >= mirror_tid) {
1811                 kprintf(" no recovery needed\n");
1812         } else {
1813                 kprintf(" freemap recovery %016jx-%016jx\n",
1814                         sync_tid + 1, mirror_tid);
1815         }
1816
1817         TAILQ_INIT(&info.list);
1818         info.depth = 0;
1819         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1820         cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
1821         hammer2_chain_lookup_done(parent);
1822
1823         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1824                 TAILQ_REMOVE(&info.list, elm, entry);
1825                 parent = elm->chain;
1826                 sync_tid = elm->sync_tid;
1827                 kfree(elm, M_HAMMER2);
1828
1829                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1830                 error = hammer2_recovery_scan(hmp, parent, &info,
1831                                               hmp->voldata.freemap_tid);
1832                 hammer2_chain_unlock(parent);
1833                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
1834                 if (error)
1835                         cumulative_error = error;
1836         }
1837         hammer2_trans_done(hmp->spmp);
1838
1839         return cumulative_error;
1840 }
1841
1842 static
1843 int
1844 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
1845                       struct hammer2_recovery_info *info,
1846                       hammer2_tid_t sync_tid)
1847 {
1848         const hammer2_inode_data_t *ripdata;
1849         hammer2_chain_t *chain;
1850         hammer2_blockref_t bref;
1851         int cache_index;
1852         int cumulative_error = 0;
1853         int error;
1854         int first;
1855
1856         /*
1857          * Adjust freemap to ensure that the block(s) are marked allocated.
1858          */
1859         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1860                 hammer2_freemap_adjust(hmp, &parent->bref,
1861                                        HAMMER2_FREEMAP_DORECOVER);
1862         }
1863
1864         /*
1865          * Check type for recursive scan
1866          */
1867         switch(parent->bref.type) {
1868         case HAMMER2_BREF_TYPE_VOLUME:
1869                 /* data already instantiated */
1870                 break;
1871         case HAMMER2_BREF_TYPE_INODE:
1872                 /*
1873                  * Must instantiate data for DIRECTDATA test and also
1874                  * for recursion.
1875                  */
1876                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1877                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
1878                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
1879                         /* not applicable to recovery scan */
1880                         hammer2_chain_unlock(parent);
1881                         return 0;
1882                 }
1883                 hammer2_chain_unlock(parent);
1884                 break;
1885         case HAMMER2_BREF_TYPE_INDIRECT:
1886                 /*
1887                  * Must instantiate data for recursion
1888                  */
1889                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1890                 hammer2_chain_unlock(parent);
1891                 break;
1892         case HAMMER2_BREF_TYPE_DATA:
1893         case HAMMER2_BREF_TYPE_FREEMAP:
1894         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1895         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1896                 /* not applicable to recovery scan */
1897                 return 0;
1898                 break;
1899         default:
1900                 return EDOM;
1901         }
1902
1903         /*
1904          * Defer operation if depth limit reached or if we are crossing a
1905          * PFS boundary.
1906          */
1907         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
1908                 struct hammer2_recovery_elm *elm;
1909
1910                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
1911                 elm->chain = parent;
1912                 elm->sync_tid = sync_tid;
1913                 hammer2_chain_ref(parent);
1914                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
1915                 /* unlocked by caller */
1916
1917                 return(0);
1918         }
1919
1920
1921         /*
1922          * Recursive scan of the last flushed transaction only.  We are
1923          * doing this without pmp assignments so don't leave the chains
1924          * hanging around after we are done with them.
1925          */
1926         cache_index = 0;
1927         chain = NULL;
1928         first = 1;
1929
1930         while (hammer2_chain_scan(parent, &chain, &bref,
1931                                   &first, &cache_index,
1932                                   HAMMER2_LOOKUP_NODATA) != NULL) {
1933                 /*
1934                  * If this is a leaf
1935                  */
1936                 if (chain == NULL) {
1937                         if (bref.mirror_tid > sync_tid) {
1938                                 hammer2_freemap_adjust(hmp, &bref,
1939                                                      HAMMER2_FREEMAP_DORECOVER);
1940                         }
1941                         continue;
1942                 }
1943
1944                 /*
1945                  * This may or may not be a recursive node.
1946                  */
1947                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
1948                 if (bref.mirror_tid > sync_tid) {
1949                         ++info->depth;
1950                         error = hammer2_recovery_scan(hmp, chain,
1951                                                       info, sync_tid);
1952                         --info->depth;
1953                         if (error)
1954                                 cumulative_error = error;
1955                 }
1956
1957                 /*
1958                  * Flush the recovery at the PFS boundary to stage it for
1959                  * the final flush of the super-root topology.
1960                  */
1961                 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
1962                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
1963                         hammer2_flush(chain, HAMMER2_FLUSH_TOP);
1964                 }
1965         }
1966
1967         return cumulative_error;
1968 }
1969
1970 /*
1971  * Sync a mount point; this is called on a per-mount basis from the
1972  * filesystem syncer process periodically and whenever a user issues
1973  * a sync.
1974  */
1975 int
1976 hammer2_vfs_sync(struct mount *mp, int waitfor)
1977 {
1978         hammer2_xop_flush_t *xop;
1979         struct hammer2_sync_info info;
1980         hammer2_inode_t *iroot;
1981         hammer2_pfs_t *pmp;
1982         int flags;
1983         int error;
1984
1985         pmp = MPTOPMP(mp);
1986         iroot = pmp->iroot;
1987         KKASSERT(iroot);
1988         KKASSERT(iroot->pmp == pmp);
1989
1990         /*
1991          * We can't acquire locks on existing vnodes while in a transaction
1992          * without risking a deadlock.  This assumes that vfsync() can be
1993          * called without the vnode locked (which it can in DragonFly).
1994          * Otherwise we'd have to implement a multi-pass or flag the lock
1995          * failures and retry.
1996          *
1997          * The reclamation code interlocks with the sync list's token
1998          * (by removing the vnode from the scan list) before unlocking
1999          * the inode, giving us time to ref the inode.
2000          */
2001         /*flags = VMSC_GETVP;*/
2002         flags = 0;
2003         if (waitfor & MNT_LAZY)
2004                 flags |= VMSC_ONEPASS;
2005
2006 #if 0
2007         /*
2008          * Preflush the vnodes using a normal transaction before interlocking
2009          * with a flush transaction.
2010          */
2011         hammer2_trans_init(pmp, 0);
2012         info.error = 0;
2013         info.waitfor = MNT_NOWAIT;
2014         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2015         hammer2_trans_done(pmp);
2016 #endif
2017
2018         /*
2019          * Start our flush transaction.  This does not return until all
2020          * concurrent transactions have completed and will prevent any
2021          * new transactions from running concurrently, except for the
2022          * buffer cache transactions.
2023          *
2024          * For efficiency do an async pass before making sure with a
2025          * synchronous pass on all related buffer cache buffers.  It
2026          * should theoretically not be possible for any new file buffers
2027          * to be instantiated during this sequence.
2028          */
2029         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH |
2030                                 HAMMER2_TRANS_PREFLUSH);
2031         hammer2_inode_run_sideq(pmp);
2032
2033         info.error = 0;
2034         info.waitfor = MNT_NOWAIT;
2035         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2036         info.waitfor = MNT_WAIT;
2037         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2038
2039         /*
2040          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2041          * buffer cache flushes which occur during the flush.  Device buffers
2042          * are not affected.
2043          */
2044         hammer2_bioq_sync(pmp);
2045         hammer2_trans_clear_preflush(pmp);
2046
2047         /*
2048          * Use the XOP interface to concurrently flush all nodes to
2049          * synchronize the PFSROOT subtopology to the media.  A standard
2050          * end-of-scan ENOENT error indicates cluster sufficiency.
2051          *
2052          * Note that this flush will not be visible on crash recovery until
2053          * we flush the super-root topology in the next loop.
2054          *
2055          * XXX For now wait for all flushes to complete.
2056          */
2057         if (iroot) {
2058                 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
2059                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2060                 error = hammer2_xop_collect(&xop->head,
2061                                             HAMMER2_XOP_COLLECT_WAITALL);
2062                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2063                 if (error == ENOENT)
2064                         error = 0;
2065         } else {
2066                 error = 0;
2067         }
2068         hammer2_trans_done(pmp);
2069
2070         return (error);
2071 }
2072
2073 /*
2074  * Sync passes.
2075  *
2076  * Note that we ignore the tranasction mtid we got above.  Instead,
2077  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2078  * transactions.
2079  */
2080 static int
2081 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2082 {
2083         struct hammer2_sync_info *info = data;
2084         hammer2_inode_t *ip;
2085         int error;
2086
2087         /*
2088          * Degenerate cases.  Note that ip == NULL typically means the
2089          * syncer vnode itself and we don't want to vclrisdirty() in that
2090          * situation.
2091          */
2092         ip = VTOI(vp);
2093         if (ip == NULL) {
2094                 return(0);
2095         }
2096         if (vp->v_type == VNON || vp->v_type == VBAD) {
2097                 vclrisdirty(vp);
2098                 return(0);
2099         }
2100
2101         /*
2102          * VOP_FSYNC will start a new transaction so replicate some code
2103          * here to do it inline (see hammer2_vop_fsync()).
2104          *
2105          * WARNING: The vfsync interacts with the buffer cache and might
2106          *          block, we can't hold the inode lock at that time.
2107          *          However, we MUST ref ip before blocking to ensure that
2108          *          it isn't ripped out from under us (since we do not
2109          *          hold a lock on the vnode).
2110          */
2111         hammer2_inode_ref(ip);
2112         if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2113             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2114                 vfsync(vp, info->waitfor, 1, NULL, NULL);
2115                 if (ip->flags & (HAMMER2_INODE_RESIZED |
2116                                  HAMMER2_INODE_MODIFIED)) {
2117                         hammer2_inode_lock(ip, 0);
2118                         hammer2_inode_chain_sync(ip);
2119                         hammer2_inode_unlock(ip);
2120                 }
2121         }
2122         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2123             RB_EMPTY(&vp->v_rbdirty_tree)) {
2124                 vclrisdirty(vp);
2125         }
2126
2127         hammer2_inode_drop(ip);
2128 #if 1
2129         error = 0;
2130         if (error)
2131                 info->error = error;
2132 #endif
2133         return(0);
2134 }
2135
2136 static
2137 int
2138 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2139 {
2140         return (0);
2141 }
2142
2143 static
2144 int
2145 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2146                struct fid *fhp, struct vnode **vpp)
2147 {
2148         return (0);
2149 }
2150
2151 static
2152 int
2153 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2154                  int *exflagsp, struct ucred **credanonp)
2155 {
2156         return (0);
2157 }
2158
2159 /*
2160  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2161  * header into the HMP
2162  *
2163  * XXX read four volhdrs and use the one with the highest TID whos CRC
2164  *     matches.
2165  *
2166  * XXX check iCRCs.
2167  *
2168  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2169  *     nonexistant locations.
2170  *
2171  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2172  */
2173 static
2174 int
2175 hammer2_install_volume_header(hammer2_dev_t *hmp)
2176 {
2177         hammer2_volume_data_t *vd;
2178         struct buf *bp;
2179         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2180         int error_reported;
2181         int error;
2182         int valid;
2183         int i;
2184
2185         error_reported = 0;
2186         error = 0;
2187         valid = 0;
2188         bp = NULL;
2189
2190         /*
2191          * There are up to 4 copies of the volume header (syncs iterate
2192          * between them so there is no single master).  We don't trust the
2193          * volu_size field so we don't know precisely how large the filesystem
2194          * is, so depend on the OS to return an error if we go beyond the
2195          * block device's EOF.
2196          */
2197         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2198                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2199                               HAMMER2_VOLUME_BYTES, &bp);
2200                 if (error) {
2201                         brelse(bp);
2202                         bp = NULL;
2203                         continue;
2204                 }
2205
2206                 vd = (struct hammer2_volume_data *) bp->b_data;
2207                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2208                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2209                         brelse(bp);
2210                         bp = NULL;
2211                         continue;
2212                 }
2213
2214                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2215                         /* XXX: Reversed-endianness filesystem */
2216                         kprintf("hammer2: reverse-endian filesystem detected");
2217                         brelse(bp);
2218                         bp = NULL;
2219                         continue;
2220                 }
2221
2222                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2223                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2224                                       HAMMER2_VOLUME_ICRC0_SIZE);
2225                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2226                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2227                                        HAMMER2_VOLUME_ICRC1_SIZE);
2228                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2229                         kprintf("hammer2 volume header crc "
2230                                 "mismatch copy #%d %08x/%08x\n",
2231                                 i, crc0, crc);
2232                         error_reported = 1;
2233                         brelse(bp);
2234                         bp = NULL;
2235                         continue;
2236                 }
2237                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2238                         valid = 1;
2239                         hmp->voldata = *vd;
2240                         hmp->volhdrno = i;
2241                 }
2242                 brelse(bp);
2243                 bp = NULL;
2244         }
2245         if (valid) {
2246                 hmp->volsync = hmp->voldata;
2247                 error = 0;
2248                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2249                         kprintf("hammer2: using volume header #%d\n",
2250                                 hmp->volhdrno);
2251                 }
2252         } else {
2253                 error = EINVAL;
2254                 kprintf("hammer2: no valid volume headers found!\n");
2255         }
2256         return (error);
2257 }
2258
2259 /*
2260  * This handles hysteresis on regular file flushes.  Because the BIOs are
2261  * routed to a thread it is possible for an excessive number to build up
2262  * and cause long front-end stalls long before the runningbuffspace limit
2263  * is hit, so we implement hammer2_flush_pipe to control the
2264  * hysteresis.
2265  *
2266  * This is a particular problem when compression is used.
2267  */
2268 void
2269 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2270 {
2271         atomic_add_int(&pmp->count_lwinprog, 1);
2272 }
2273
2274 void
2275 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2276 {
2277         int lwinprog;
2278
2279         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2280         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2281             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2282                 atomic_clear_int(&pmp->count_lwinprog,
2283                                  HAMMER2_LWINPROG_WAITING);
2284                 wakeup(&pmp->count_lwinprog);
2285         }
2286         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2287             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2288                 atomic_clear_int(&pmp->count_lwinprog,
2289                                  HAMMER2_LWINPROG_WAITING0);
2290                 wakeup(&pmp->count_lwinprog);
2291         }
2292 }
2293
2294 void
2295 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2296 {
2297         int lwinprog;
2298         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2299                                     HAMMER2_LWINPROG_WAITING0;
2300
2301         for (;;) {
2302                 lwinprog = pmp->count_lwinprog;
2303                 cpu_ccfence();
2304                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2305                         break;
2306                 tsleep_interlock(&pmp->count_lwinprog, 0);
2307                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2308                 lwinprog = pmp->count_lwinprog;
2309                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2310                         break;
2311                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2312         }
2313 }
2314
2315 /*
2316  * Manage excessive memory resource use for chain and related
2317  * structures.
2318  */
2319 void
2320 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2321 {
2322         uint32_t waiting;
2323         uint32_t count;
2324         uint32_t limit;
2325 #if 0
2326         static int zzticks;
2327 #endif
2328
2329         /*
2330          * Atomic check condition and wait.  Also do an early speedup of
2331          * the syncer to try to avoid hitting the wait.
2332          */
2333         for (;;) {
2334                 waiting = pmp->inmem_dirty_chains;
2335                 cpu_ccfence();
2336                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2337
2338                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2339                 if (limit < hammer2_limit_dirty_chains)
2340                         limit = hammer2_limit_dirty_chains;
2341                 if (limit < 1000)
2342                         limit = 1000;
2343
2344 #if 0
2345                 if ((int)(ticks - zzticks) > hz) {
2346                         zzticks = ticks;
2347                         kprintf("count %ld %ld\n", count, limit);
2348                 }
2349 #endif
2350
2351                 /*
2352                  * Block if there are too many dirty chains present, wait
2353                  * for the flush to clean some out.
2354                  */
2355                 if (count > limit) {
2356                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2357                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2358                                                waiting,
2359                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2360                                 speedup_syncer(pmp->mp);
2361                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2362                                        "chnmem", hz);
2363                         }
2364                         continue;       /* loop on success or fail */
2365                 }
2366
2367                 /*
2368                  * Try to start an early flush before we are forced to block.
2369                  */
2370                 if (count > limit * 7 / 10)
2371                         speedup_syncer(pmp->mp);
2372                 break;
2373         }
2374 }
2375
2376 void
2377 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2378 {
2379         if (pmp) {
2380                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2381         }
2382 }
2383
2384 void
2385 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2386 {
2387         uint32_t waiting;
2388
2389         if (pmp == NULL)
2390                 return;
2391
2392         for (;;) {
2393                 waiting = pmp->inmem_dirty_chains;
2394                 cpu_ccfence();
2395                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2396                                        waiting,
2397                                        (waiting - 1) &
2398                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2399                         break;
2400                 }
2401         }
2402
2403         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2404                 wakeup(&pmp->inmem_dirty_chains);
2405 }
2406
2407 /*
2408  * Debugging
2409  */
2410 void
2411 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2412 {
2413         hammer2_chain_t *scan;
2414         hammer2_chain_t *parent;
2415
2416         --*countp;
2417         if (*countp == 0) {
2418                 kprintf("%*.*s...\n", tab, tab, "");
2419                 return;
2420         }
2421         if (*countp < 0)
2422                 return;
2423         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2424                 tab, tab, "", pfx,
2425                 chain, chain->bref.type,
2426                 chain->bref.key, chain->bref.keybits,
2427                 chain->bref.mirror_tid);
2428
2429         kprintf("%*.*s      [%08x] (%s) refs=%d",
2430                 tab, tab, "",
2431                 chain->flags,
2432                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2433                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2434                 chain->refs);
2435
2436         parent = chain->parent;
2437         if (parent)
2438                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2439                         tab, tab, "",
2440                         parent, parent->flags, parent->refs);
2441         if (RB_EMPTY(&chain->core.rbtree)) {
2442                 kprintf("\n");
2443         } else {
2444                 kprintf(" {\n");
2445                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2446                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2447                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2448                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2449                                 chain->data->ipdata.filename);
2450                 else
2451                         kprintf("%*.*s}\n", tab, tab, "");
2452         }
2453 }