sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2018 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61 #include "hammer2_lz4.h"
  62
  63 #include "zlib/hammer2_zlib.h"
  64
  65 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  66
  67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  68
  69 struct hammer2_sync_info {
  70         int error;
  71         int waitfor;
  72         int pass;
  73 };
  74
  75 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
  76 static struct hammer2_mntlist hammer2_mntlist;
  77
  78 struct hammer2_pfslist hammer2_pfslist;
  79 struct hammer2_pfslist hammer2_spmplist;
  80 struct lock hammer2_mntlk;
  81
  82 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT;
  83 int hammer2_debug;
  84 int hammer2_cluster_meta_read = 1;      /* physical read-ahead */
  85 int hammer2_cluster_data_read = 4;      /* physical read-ahead */
  86 int hammer2_dedup_enable = 1;
  87 int hammer2_always_compress = 0;        /* always try to compress */
  88 int hammer2_inval_enable = 0;
  89 int hammer2_flush_pipe = 100;
  90 int hammer2_dio_count;
  91 int hammer2_dio_limit = 256;
  92 int hammer2_bulkfree_tps = 5000;
  93 long hammer2_chain_allocs;
  94 long hammer2_chain_frees;
  95 long hammer2_limit_dirty_chains;
  96 long hammer2_limit_dirty_inodes;
  97 long hammer2_count_modified_chains;
  98 long hammer2_iod_invals;
  99 long hammer2_iod_file_read;
 100 long hammer2_iod_meta_read;
 101 long hammer2_iod_indr_read;
 102 long hammer2_iod_fmap_read;
 103 long hammer2_iod_volu_read;
 104 long hammer2_iod_file_write;
 105 long hammer2_iod_file_wembed;
 106 long hammer2_iod_file_wzero;
 107 long hammer2_iod_file_wdedup;
 108 long hammer2_iod_meta_write;
 109 long hammer2_iod_indr_write;
 110 long hammer2_iod_fmap_write;
 111 long hammer2_iod_volu_write;
 112
 113 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
 114 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
 115                 "Buffer used for compression.");
 116
 117 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
 118 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
 119                 "Buffer used for decompression.");
 120
 121 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 122
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
 124            &hammer2_supported_version, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 126            &hammer2_debug, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
 128            &hammer2_cluster_meta_read, 0, "");
 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
 130            &hammer2_cluster_data_read, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
 132            &hammer2_dedup_enable, 0, "");
 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
 134            &hammer2_always_compress, 0, "");
 135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
 136            &hammer2_inval_enable, 0, "");
 137 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 138            &hammer2_flush_pipe, 0, "");
 139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
 140            &hammer2_bulkfree_tps, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
 142            &hammer2_chain_allocs, 0, "");
 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
 144            &hammer2_chain_frees, 0, "");
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 146            &hammer2_limit_dirty_chains, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW,
 148            &hammer2_limit_dirty_inodes, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
 150            &hammer2_count_modified_chains, 0, "");
 151 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 152            &hammer2_dio_count, 0, "");
 153 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
 154            &hammer2_dio_limit, 0, "");
 155
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
 157            &hammer2_iod_invals, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 159            &hammer2_iod_file_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 161            &hammer2_iod_meta_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 163            &hammer2_iod_indr_read, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 165            &hammer2_iod_fmap_read, 0, "");
 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 167            &hammer2_iod_volu_read, 0, "");
 168
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 170            &hammer2_iod_file_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
 172            &hammer2_iod_file_wembed, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
 174            &hammer2_iod_file_wzero, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
 176            &hammer2_iod_file_wdedup, 0, "");
 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 178            &hammer2_iod_meta_write, 0, "");
 179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 180            &hammer2_iod_indr_write, 0, "");
 181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 182            &hammer2_iod_fmap_write, 0, "");
 183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 184            &hammer2_iod_volu_write, 0, "");
 185
 186 long hammer2_process_icrc32;
 187 long hammer2_process_xxhash64;
 188 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW,
 189            &hammer2_process_icrc32, 0, "");
 190 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW,
 191            &hammer2_process_xxhash64, 0, "");
 192
 193 static int hammer2_vfs_init(struct vfsconf *conf);
 194 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 195 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 196                                 struct ucred *cred);
 197 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
 198                                 struct vnode *, struct ucred *);
 199 static int hammer2_recovery(hammer2_dev_t *hmp);
 200 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 201 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 202 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 203                                 struct ucred *cred);
 204 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 205                                 struct ucred *cred);
 206 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 207                                 struct fid *fhp, struct vnode **vpp);
 208 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 209 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 210                                 int *exflagsp, struct ucred **credanonp);
 211
 212 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
 213 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 214
 215 static void hammer2_update_pmps(hammer2_dev_t *hmp);
 216
 217 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
 218 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
 219                                 hammer2_dev_t *hmp);
 220 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
 221
 222 /*
 223  * HAMMER2 vfs operations.
 224  */
 225 static struct vfsops hammer2_vfsops = {
 226         .vfs_init       = hammer2_vfs_init,
 227         .vfs_uninit     = hammer2_vfs_uninit,
 228         .vfs_sync       = hammer2_vfs_sync,
 229         .vfs_mount      = hammer2_vfs_mount,
 230         .vfs_unmount    = hammer2_vfs_unmount,
 231         .vfs_root       = hammer2_vfs_root,
 232         .vfs_statfs     = hammer2_vfs_statfs,
 233         .vfs_statvfs    = hammer2_vfs_statvfs,
 234         .vfs_vget       = hammer2_vfs_vget,
 235         .vfs_vptofh     = hammer2_vfs_vptofh,
 236         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 237         .vfs_checkexp   = hammer2_vfs_checkexp
 238 };
 239
 240 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 241
 242 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
 243 MODULE_VERSION(hammer2, 1);
 244
 245 static
 246 int
 247 hammer2_vfs_init(struct vfsconf *conf)
 248 {
 249         static struct objcache_malloc_args margs_read;
 250         static struct objcache_malloc_args margs_write;
 251         static struct objcache_malloc_args margs_vop;
 252
 253         int error;
 254
 255         error = 0;
 256
 257         /*
 258          * A large DIO cache is needed to retain dedup enablement masks.
 259          * The bulkfree code clears related masks as part of the disk block
 260          * recycling algorithm, preventing it from being used for a later
 261          * dedup.
 262          *
 263          * NOTE: A large buffer cache can actually interfere with dedup
 264          *       operation because we dedup based on media physical buffers
 265          *       and not logical buffers.  Try to make the DIO case large
 266          *       enough to avoid this problem, but also cap it.
 267          */
 268         hammer2_dio_limit = nbuf * 2;
 269         if (hammer2_dio_limit > 100000)
 270                 hammer2_dio_limit = 100000;
 271
 272         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 273                 error = EINVAL;
 274         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 275                 error = EINVAL;
 276         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 277                 error = EINVAL;
 278
 279         if (error)
 280                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 281
 282         margs_read.objsize = 65536;
 283         margs_read.mtype = M_HAMMER2_DEBUFFER;
 284
 285         margs_write.objsize = 32768;
 286         margs_write.mtype = M_HAMMER2_CBUFFER;
 287
 288         margs_vop.objsize = sizeof(hammer2_xop_t);
 289         margs_vop.mtype = M_HAMMER2;
 290
 291         /*
 292          * Note thaht for the XOPS cache we want backing store allocations
 293          * to use M_ZERO.  This is not allowed in objcache_get() (to avoid
 294          * confusion), so use the backing store function that does it.  This
 295          * means that initial XOPS objects are zerod but REUSED objects are
 296          * not.  So we are responsible for cleaning the object up sufficiently
 297          * for our needs before objcache_put()ing it back (typically just the
 298          * FIFO indices).
 299          */
 300         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 301                                 0, 1, NULL, NULL, NULL,
 302                                 objcache_malloc_alloc,
 303                                 objcache_malloc_free,
 304                                 &margs_read);
 305         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 306                                 0, 1, NULL, NULL, NULL,
 307                                 objcache_malloc_alloc,
 308                                 objcache_malloc_free,
 309                                 &margs_write);
 310         cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
 311                                 0, 1, NULL, NULL, NULL,
 312                                 objcache_malloc_alloc_zero,
 313                                 objcache_malloc_free,
 314                                 &margs_vop);
 315
 316
 317         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 318         TAILQ_INIT(&hammer2_mntlist);
 319         TAILQ_INIT(&hammer2_pfslist);
 320         TAILQ_INIT(&hammer2_spmplist);
 321
 322         hammer2_limit_dirty_chains = maxvnodes / 10;
 323         if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
 324                 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
 325
 326         hammer2_limit_dirty_inodes = maxvnodes / 100;
 327         if (hammer2_limit_dirty_inodes < 100)
 328                 hammer2_limit_dirty_inodes = 100;
 329         if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES)
 330                 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES;
 331
 332         return (error);
 333 }
 334
 335 static
 336 int
 337 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 338 {
 339         objcache_destroy(cache_buffer_read);
 340         objcache_destroy(cache_buffer_write);
 341         objcache_destroy(cache_xops);
 342         return 0;
 343 }
 344
 345 /*
 346  * Core PFS allocator.  Used to allocate or reference the pmp structure
 347  * for PFS cluster mounts and the spmp structure for media (hmp) structures.
 348  * The pmp can be passed in or loaded by this function using the chain and
 349  * inode data.
 350  *
 351  * pmp->modify_tid tracks new modify_tid transaction ids for front-end
 352  * transactions.  Note that synchronization does not use this field.
 353  * (typically frontend operations and synchronization cannot run on the
 354  * same PFS node at the same time).
 355  *
 356  * XXX check locking
 357  */
 358 hammer2_pfs_t *
 359 hammer2_pfsalloc(hammer2_chain_t *chain,
 360                  const hammer2_inode_data_t *ripdata,
 361                  hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
 362 {
 363         hammer2_pfs_t *pmp;
 364         hammer2_inode_t *iroot;
 365         int count;
 366         int i;
 367         int j;
 368
 369         pmp = NULL;
 370
 371         /*
 372          * Locate or create the PFS based on the cluster id.  If ripdata
 373          * is NULL this is a spmp which is unique and is always allocated.
 374          *
 375          * If the device is mounted in local mode all PFSs are considered
 376          * independent and not part of any cluster (for debugging only).
 377          */
 378         if (ripdata) {
 379                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 380                         if (force_local != pmp->force_local)
 381                                 continue;
 382                         if (force_local == NULL &&
 383                             bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
 384                                  sizeof(pmp->pfs_clid)) == 0) {
 385                                         break;
 386                         } else if (force_local && pmp->pfs_names[0] &&
 387                             strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
 388                                         break;
 389                         }
 390                 }
 391         }
 392
 393         if (pmp == NULL) {
 394                 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 395                 pmp->force_local = force_local;
 396                 hammer2_trans_manage_init(pmp);
 397                 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 398                 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 399                 lockinit(&pmp->lock, "pfslk", 0, 0);
 400                 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
 401                 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 402                 spin_init(&pmp->xop_spin, "h2xop");
 403                 spin_init(&pmp->lru_spin, "h2lru");
 404                 RB_INIT(&pmp->inum_tree);
 405                 TAILQ_INIT(&pmp->sideq);
 406                 TAILQ_INIT(&pmp->lru_list);
 407                 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 408
 409                 /*
 410                  * Distribute backend operations to threads
 411                  */
 412                 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
 413                         hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
 414
 415                 /*
 416                  * Save the last media transaction id for the flusher.  Set
 417                  * initial
 418                  */
 419                 if (ripdata) {
 420                         pmp->pfs_clid = ripdata->meta.pfs_clid;
 421                         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 422                 } else {
 423                         pmp->flags |= HAMMER2_PMPF_SPMP;
 424                         TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
 425                 }
 426
 427                 /*
 428                  * The synchronization thread may start too early, make
 429                  * sure it stays frozen until we are ready to let it go.
 430                  * XXX
 431                  */
 432                 /*
 433                 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
 434                                          HAMMER2_THREAD_REMASTER;
 435                 */
 436         }
 437
 438         /*
 439          * Create the PFS's root inode and any missing XOP helper threads.
 440          */
 441         if ((iroot = pmp->iroot) == NULL) {
 442                 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
 443                 if (ripdata)
 444                         iroot->meta = ripdata->meta;
 445                 pmp->iroot = iroot;
 446                 hammer2_inode_ref(iroot);
 447                 hammer2_inode_unlock(iroot);
 448         }
 449
 450         /*
 451          * Stop here if no chain is passed in.
 452          */
 453         if (chain == NULL)
 454                 goto done;
 455
 456         /*
 457          * When a chain is passed in we must add it to the PFS's root
 458          * inode, update pmp->pfs_types[], and update the syncronization
 459          * threads.
 460          *
 461          * When forcing local mode, mark the PFS as a MASTER regardless.
 462          *
 463          * At the moment empty spots can develop due to removals or failures.
 464          * Ultimately we want to re-fill these spots but doing so might
 465          * confused running code. XXX
 466          */
 467         hammer2_inode_ref(iroot);
 468         hammer2_mtx_ex(&iroot->lock);
 469         j = iroot->cluster.nchains;
 470
 471         if (j == HAMMER2_MAXCLUSTER) {
 472                 kprintf("hammer2_mount: cluster full!\n");
 473                 /* XXX fatal error? */
 474         } else {
 475                 KKASSERT(chain->pmp == NULL);
 476                 chain->pmp = pmp;
 477                 hammer2_chain_ref(chain);
 478                 iroot->cluster.array[j].chain = chain;
 479                 if (force_local)
 480                         pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
 481                 else
 482                         pmp->pfs_types[j] = ripdata->meta.pfs_type;
 483                 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
 484                 pmp->pfs_hmps[j] = chain->hmp;
 485
 486                 /*
 487                  * If the PFS is already mounted we must account
 488                  * for the mount_count here.
 489                  */
 490                 if (pmp->mp)
 491                         ++chain->hmp->mount_count;
 492
 493                 /*
 494                  * May have to fixup dirty chain tracking.  Previous
 495                  * pmp was NULL so nothing to undo.
 496                  */
 497                 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
 498                         hammer2_pfs_memory_inc(pmp);
 499                 ++j;
 500         }
 501         iroot->cluster.nchains = j;
 502
 503         /*
 504          * Update nmasters from any PFS inode which is part of the cluster.
 505          * It is possible that this will result in a value which is too
 506          * high.  MASTER PFSs are authoritative for pfs_nmasters and will
 507          * override this value later on.
 508          *
 509          * (This informs us of masters that might not currently be
 510          *  discoverable by this mount).
 511          */
 512         if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
 513                 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
 514         }
 515
 516         /*
 517          * Count visible masters.  Masters are usually added with
 518          * ripdata->meta.pfs_nmasters set to 1.  This detects when there
 519          * are more (XXX and must update the master inodes).
 520          */
 521         count = 0;
 522         for (i = 0; i < iroot->cluster.nchains; ++i) {
 523                 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
 524                         ++count;
 525         }
 526         if (pmp->pfs_nmasters < count)
 527                 pmp->pfs_nmasters = count;
 528
 529         /*
 530          * Create missing synchronization and support threads.
 531          *
 532          * Single-node masters (including snapshots) have nothing to
 533          * synchronize and do not require this thread.
 534          *
 535          * Multi-node masters or any number of soft masters, slaves, copy,
 536          * or other PFS types need the thread.
 537          *
 538          * Each thread is responsible for its particular cluster index.
 539          * We use independent threads so stalls or mismatches related to
 540          * any given target do not affect other targets.
 541          */
 542         for (i = 0; i < iroot->cluster.nchains; ++i) {
 543                 /*
 544                  * Single-node masters (including snapshots) have nothing
 545                  * to synchronize and will make direct xops support calls,
 546                  * thus they do not require this thread.
 547                  *
 548                  * Note that there can be thousands of snapshots.  We do not
 549                  * want to create thousands of threads.
 550                  */
 551                 if (pmp->pfs_nmasters <= 1 &&
 552                     pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
 553                         continue;
 554                 }
 555
 556                 /*
 557                  * Sync support thread
 558                  */
 559                 if (pmp->sync_thrs[i].td == NULL) {
 560                         hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
 561                                            "h2nod", i, -1,
 562                                            hammer2_primary_sync_thread);
 563                 }
 564         }
 565
 566         /*
 567          * Create missing Xop threads
 568          *
 569          * NOTE: We create helper threads for all mounted PFSs or any
 570          *       PFSs with 2+ nodes (so the sync thread can update them,
 571          *       even if not mounted).
 572          */
 573         if (pmp->mp || iroot->cluster.nchains >= 2)
 574                 hammer2_xop_helper_create(pmp);
 575
 576         hammer2_mtx_unlock(&iroot->lock);
 577         hammer2_inode_drop(iroot);
 578 done:
 579         return pmp;
 580 }
 581
 582 /*
 583  * Deallocate an element of a probed PFS.  If destroying and this is a
 584  * MASTER, adjust nmasters.
 585  *
 586  * This function does not physically destroy the PFS element in its device
 587  * under the super-root  (see hammer2_ioctl_pfs_delete()).
 588  */
 589 void
 590 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
 591 {
 592         hammer2_inode_t *iroot;
 593         hammer2_chain_t *chain;
 594         int j;
 595
 596         /*
 597          * Cleanup our reference on iroot.  iroot is (should) not be needed
 598          * by the flush code.
 599          */
 600         iroot = pmp->iroot;
 601         if (iroot) {
 602                 /*
 603                  * Stop synchronizing
 604                  *
 605                  * XXX flush after acquiring the iroot lock.
 606                  * XXX clean out the cluster index from all inode structures.
 607                  */
 608                 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
 609
 610                 /*
 611                  * Remove the cluster index from the group.  If destroying
 612                  * the PFS and this is a master, adjust pfs_nmasters.
 613                  */
 614                 hammer2_mtx_ex(&iroot->lock);
 615                 chain = iroot->cluster.array[clindex].chain;
 616                 iroot->cluster.array[clindex].chain = NULL;
 617
 618                 switch(pmp->pfs_types[clindex]) {
 619                 case HAMMER2_PFSTYPE_MASTER:
 620                         if (destroying && pmp->pfs_nmasters > 0)
 621                                 --pmp->pfs_nmasters;
 622                         /* XXX adjust ripdata->meta.pfs_nmasters */
 623                         break;
 624                 default:
 625                         break;
 626                 }
 627                 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
 628
 629                 hammer2_mtx_unlock(&iroot->lock);
 630
 631                 /*
 632                  * Release the chain.
 633                  */
 634                 if (chain) {
 635                         atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 636                         hammer2_chain_drop(chain);
 637                 }
 638
 639                 /*
 640                  * Terminate all XOP threads for the cluster index.
 641                  */
 642                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 643                         hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
 644         }
 645 }
 646
 647 /*
 648  * Destroy a PFS, typically only occurs after the last mount on a device
 649  * has gone away.
 650  */
 651 static void
 652 hammer2_pfsfree(hammer2_pfs_t *pmp)
 653 {
 654         hammer2_inode_t *iroot;
 655         hammer2_chain_t *chain;
 656         int i;
 657         int j;
 658
 659         /*
 660          * Cleanup our reference on iroot.  iroot is (should) not be needed
 661          * by the flush code.
 662          */
 663         if (pmp->flags & HAMMER2_PMPF_SPMP)
 664                 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
 665         else
 666                 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
 667
 668         iroot = pmp->iroot;
 669         if (iroot) {
 670                 for (i = 0; i < iroot->cluster.nchains; ++i) {
 671                         hammer2_thr_delete(&pmp->sync_thrs[i]);
 672                         for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
 673                                 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
 674                 }
 675 #if REPORT_REFS_ERRORS
 676                 if (pmp->iroot->refs != 1)
 677                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 678                                 pmp->iroot, pmp->iroot->refs);
 679 #else
 680                 KKASSERT(pmp->iroot->refs == 1);
 681 #endif
 682                 /* ref for pmp->iroot */
 683                 hammer2_inode_drop(pmp->iroot);
 684                 pmp->iroot = NULL;
 685         }
 686
 687         /*
 688          * Cleanup chains remaining on LRU list.
 689          */
 690         hammer2_spin_ex(&pmp->lru_spin);
 691         while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
 692                 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
 693                 atomic_add_int(&pmp->lru_count, -1);
 694                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
 695                 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
 696                 hammer2_chain_ref(chain);
 697                 hammer2_spin_unex(&pmp->lru_spin);
 698                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
 699                 hammer2_chain_drop(chain);
 700                 hammer2_spin_ex(&pmp->lru_spin);
 701         }
 702         hammer2_spin_unex(&pmp->lru_spin);
 703
 704         /*
 705          * Free remaining pmp resources
 706          */
 707         kmalloc_destroy(&pmp->mmsg);
 708         kmalloc_destroy(&pmp->minode);
 709
 710         kfree(pmp, M_HAMMER2);
 711 }
 712
 713 /*
 714  * Remove all references to hmp from the pfs list.  Any PFS which becomes
 715  * empty is terminated and freed.
 716  *
 717  * XXX inefficient.
 718  */
 719 static void
 720 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
 721 {
 722         hammer2_pfs_t *pmp;
 723         hammer2_inode_t *iroot;
 724         hammer2_chain_t *rchain;
 725         int didfreeze;
 726         int i;
 727         int j;
 728         struct hammer2_pfslist *wlist;
 729
 730         if (which == 0)
 731                 wlist = &hammer2_pfslist;
 732         else
 733                 wlist = &hammer2_spmplist;
 734 again:
 735         TAILQ_FOREACH(pmp, wlist, mntentry) {
 736                 if ((iroot = pmp->iroot) == NULL)
 737                         continue;
 738                 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
 739                 hammer2_inode_run_sideq(pmp, 1);
 740                 hammer2_bioq_sync(pmp);
 741                 hammer2_trans_done(pmp);
 742
 743                 /*
 744                  * Determine if this PFS is affected.  If it is we must
 745                  * freeze all management threads and lock its iroot.
 746                  *
 747                  * Freezing a management thread forces it idle, operations
 748                  * in-progress will be aborted and it will have to start
 749                  * over again when unfrozen, or exit if told to exit.
 750                  */
 751                 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 752                         if (pmp->pfs_hmps[i] == hmp)
 753                                 break;
 754                 }
 755                 if (i != HAMMER2_MAXCLUSTER) {
 756                         /*
 757                          * Make sure all synchronization threads are locked
 758                          * down.
 759                          */
 760                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 761                                 if (pmp->pfs_hmps[i] == NULL)
 762                                         continue;
 763                                 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
 764                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 765                                         hammer2_thr_freeze_async(
 766                                                 &pmp->xop_groups[j].thrs[i]);
 767                                 }
 768                         }
 769                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 770                                 if (pmp->pfs_hmps[i] == NULL)
 771                                         continue;
 772                                 hammer2_thr_freeze(&pmp->sync_thrs[i]);
 773                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 774                                         hammer2_thr_freeze(
 775                                                 &pmp->xop_groups[j].thrs[i]);
 776                                 }
 777                         }
 778
 779                         /*
 780                          * Lock the inode and clean out matching chains.
 781                          * Note that we cannot use hammer2_inode_lock_*()
 782                          * here because that would attempt to validate the
 783                          * cluster that we are in the middle of ripping
 784                          * apart.
 785                          *
 786                          * WARNING! We are working directly on the inodes
 787                          *          embedded cluster.
 788                          */
 789                         hammer2_mtx_ex(&iroot->lock);
 790
 791                         /*
 792                          * Remove the chain from matching elements of the PFS.
 793                          */
 794                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 795                                 if (pmp->pfs_hmps[i] != hmp)
 796                                         continue;
 797                                 hammer2_thr_delete(&pmp->sync_thrs[i]);
 798                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 799                                         hammer2_thr_delete(
 800                                                 &pmp->xop_groups[j].thrs[i]);
 801                                 }
 802                                 rchain = iroot->cluster.array[i].chain;
 803                                 iroot->cluster.array[i].chain = NULL;
 804                                 pmp->pfs_types[i] = 0;
 805                                 if (pmp->pfs_names[i]) {
 806                                         kfree(pmp->pfs_names[i], M_HAMMER2);
 807                                         pmp->pfs_names[i] = NULL;
 808                                 }
 809                                 if (rchain) {
 810                                         hammer2_chain_drop(rchain);
 811                                         /* focus hint */
 812                                         if (iroot->cluster.focus == rchain)
 813                                                 iroot->cluster.focus = NULL;
 814                                 }
 815                                 pmp->pfs_hmps[i] = NULL;
 816                         }
 817                         hammer2_mtx_unlock(&iroot->lock);
 818                         didfreeze = 1;  /* remaster, unfreeze down below */
 819                 } else {
 820                         didfreeze = 0;
 821                 }
 822
 823                 /*
 824                  * Cleanup trailing chains.  Gaps may remain.
 825                  */
 826                 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
 827                         if (pmp->pfs_hmps[i])
 828                                 break;
 829                 }
 830                 iroot->cluster.nchains = i + 1;
 831
 832                 /*
 833                  * If the PMP has no elements remaining we can destroy it.
 834                  * (this will transition management threads from frozen->exit).
 835                  */
 836                 if (iroot->cluster.nchains == 0) {
 837                         /*
 838                          * If this was the hmp's spmp, we need to clean
 839                          * a little more stuff out.
 840                          */
 841                         if (hmp->spmp == pmp) {
 842                                 hmp->spmp = NULL;
 843                                 hmp->vchain.pmp = NULL;
 844                                 hmp->fchain.pmp = NULL;
 845                         }
 846
 847                         /*
 848                          * Free the pmp and restart the loop
 849                          */
 850                         hammer2_pfsfree(pmp);
 851                         goto again;
 852                 }
 853
 854                 /*
 855                  * If elements still remain we need to set the REMASTER
 856                  * flag and unfreeze it.
 857                  */
 858                 if (didfreeze) {
 859                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
 860                                 if (pmp->pfs_hmps[i] == NULL)
 861                                         continue;
 862                                 hammer2_thr_remaster(&pmp->sync_thrs[i]);
 863                                 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
 864                                 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
 865                                         hammer2_thr_remaster(
 866                                                 &pmp->xop_groups[j].thrs[i]);
 867                                         hammer2_thr_unfreeze(
 868                                                 &pmp->xop_groups[j].thrs[i]);
 869                                 }
 870                         }
 871                 }
 872         }
 873 }
 874
 875 /*
 876  * Mount or remount HAMMER2 fileystem from physical media
 877  *
 878  *      mountroot
 879  *              mp              mount point structure
 880  *              path            NULL
 881  *              data            <unused>
 882  *              cred            <unused>
 883  *
 884  *      mount
 885  *              mp              mount point structure
 886  *              path            path to mount point
 887  *              data            pointer to argument structure in user space
 888  *                      volume  volume path (device@LABEL form)
 889  *                      hflags  user mount flags
 890  *              cred            user credentials
 891  *
 892  * RETURNS:     0       Success
 893  *              !0      error number
 894  */
 895 static
 896 int
 897 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 898                   struct ucred *cred)
 899 {
 900         struct hammer2_mount_info info;
 901         hammer2_pfs_t *pmp;
 902         hammer2_pfs_t *spmp;
 903         hammer2_dev_t *hmp;
 904         hammer2_dev_t *force_local;
 905         hammer2_key_t key_next;
 906         hammer2_key_t key_dummy;
 907         hammer2_key_t lhc;
 908         struct vnode *devvp;
 909         struct nlookupdata nd;
 910         hammer2_chain_t *parent;
 911         hammer2_chain_t *chain;
 912         hammer2_cluster_t *cluster;
 913         const hammer2_inode_data_t *ripdata;
 914         hammer2_blockref_t bref;
 915         struct file *fp;
 916         char devstr[MNAMELEN];
 917         size_t size;
 918         size_t done;
 919         char *dev;
 920         char *label;
 921         int ronly = 1;
 922         int error;
 923         int i;
 924
 925         hmp = NULL;
 926         pmp = NULL;
 927         dev = NULL;
 928         label = NULL;
 929         devvp = NULL;
 930
 931         kprintf("hammer2_mount\n");
 932
 933         if (path == NULL) {
 934                 /*
 935                  * Root mount
 936                  */
 937                 bzero(&info, sizeof(info));
 938                 info.cluster_fd = -1;
 939                 ksnprintf(devstr, sizeof(devstr), "%s",
 940                           mp->mnt_stat.f_mntfromname);
 941                 kprintf("hammer2_mount: root '%s'\n", devstr);
 942         } else {
 943                 /*
 944                  * Non-root mount or updating a mount
 945                  */
 946                 error = copyin(data, &info, sizeof(info));
 947                 if (error)
 948                         return (error);
 949
 950                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 951                 if (error)
 952                         return (error);
 953         }
 954
 955         /*
 956          * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
 957          * if no label specified, based on the partition id.  Error out if no
 958          * label or device (with partition id) is specified.  This is strictly
 959          * a convenience to match the default label created by newfs_hammer2,
 960          * our preference is that a label always be specified.
 961          *
 962          * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command
 963          *       that does not specify a device, as long as some H2 label
 964          *       has already been mounted from that device.  This makes
 965          *       mounting snapshots a lot easier.
 966          */
 967         dev = devstr;
 968         label = strchr(devstr, '@');
 969         if (label && ((label + 1) - dev) > done)
 970                 return (EINVAL);
 971         if (label == NULL || label[1] == 0) {
 972                 char slice;
 973
 974                 if (label == NULL)
 975                         label = devstr + strlen(devstr);
 976                 slice = label[-1];
 977                 switch(slice) {
 978                 case 'a':
 979                         label = "BOOT";
 980                         break;
 981                 case 'd':
 982                         label = "ROOT";
 983                         break;
 984                 default:
 985                         label = "DATA";
 986                         break;
 987                 }
 988         } else {
 989                 *label = '\0';
 990                 label++;
 991         }
 992
 993         kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
 994                 dev, label, (mp->mnt_flag & MNT_RDONLY));
 995
 996         if (mp->mnt_flag & MNT_UPDATE) {
 997                 /*
 998                  * Update mount.  Note that pmp->iroot->cluster is
 999                  * an inode-embedded cluster and thus cannot be
1000                  * directly locked.
1001                  *
1002                  * XXX HAMMER2 needs to implement NFS export via
1003                  *     mountctl.
1004                  */
1005                 pmp = MPTOPMP(mp);
1006                 pmp->hflags = info.hflags;
1007                 cluster = &pmp->iroot->cluster;
1008                 for (i = 0; i < cluster->nchains; ++i) {
1009                         if (cluster->array[i].chain == NULL)
1010                                 continue;
1011                         hmp = cluster->array[i].chain->hmp;
1012                         devvp = hmp->devvp;
1013                         error = hammer2_remount(hmp, mp, path,
1014                                                 devvp, cred);
1015                         if (error)
1016                                 break;
1017                 }
1018
1019                 return error;
1020         }
1021
1022         /*
1023          * HMP device mount
1024          *
1025          * If a path is specified and dev is not an empty string, lookup the
1026          * name and verify that it referes to a block device.
1027          *
1028          * If a path is specified and dev is an empty string we fall through
1029          * and locate the label in the hmp search.
1030          */
1031         if (path && *dev != 0) {
1032                 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
1033                 if (error == 0)
1034                         error = nlookup(&nd);
1035                 if (error == 0)
1036                         error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
1037                 nlookup_done(&nd);
1038         } else if (path == NULL) {
1039                 /* root mount */
1040                 cdev_t cdev = kgetdiskbyname(dev);
1041                 error = bdevvp(cdev, &devvp);
1042                 if (error)
1043                         kprintf("hammer2: cannot find '%s'\n", dev);
1044         } else {
1045                 /*
1046                  * We will locate the hmp using the label in the hmp loop.
1047                  */
1048                 error = 0;
1049         }
1050
1051         /*
1052          * Make sure its a block device.  Do not check to see if it is
1053          * already mounted until we determine that its a fresh H2 device.
1054          */
1055         if (error == 0 && devvp) {
1056                 vn_isdisk(devvp, &error);
1057         }
1058
1059         /*
1060          * Determine if the device has already been mounted.  After this
1061          * check hmp will be non-NULL if we are doing the second or more
1062          * hammer2 mounts from the same device.
1063          */
1064         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1065         if (devvp) {
1066                 /*
1067                  * Match the device.  Due to the way devfs works,
1068                  * we may not be able to directly match the vnode pointer,
1069                  * so also check to see if the underlying device matches.
1070                  */
1071                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1072                         if (hmp->devvp == devvp)
1073                                 break;
1074                         if (devvp->v_rdev &&
1075                             hmp->devvp->v_rdev == devvp->v_rdev) {
1076                                 break;
1077                         }
1078                 }
1079
1080                 /*
1081                  * If no match this may be a fresh H2 mount, make sure
1082                  * the device is not mounted on anything else.
1083                  */
1084                 if (hmp == NULL)
1085                         error = vfs_mountedon(devvp);
1086         } else if (error == 0) {
1087                 /*
1088                  * Match the label to a pmp already probed.
1089                  */
1090                 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1091                         for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1092                                 if (pmp->pfs_names[i] &&
1093                                     strcmp(pmp->pfs_names[i], label) == 0) {
1094                                         hmp = pmp->pfs_hmps[i];
1095                                         break;
1096                                 }
1097                         }
1098                         if (hmp)
1099                                 break;
1100                 }
1101                 if (hmp == NULL)
1102                         error = ENOENT;
1103         }
1104
1105         /*
1106          * Open the device if this isn't a secondary mount and construct
1107          * the H2 device mount (hmp).
1108          */
1109         if (hmp == NULL) {
1110                 hammer2_chain_t *schain;
1111                 hammer2_xid_t xid;
1112
1113                 if (error == 0 && vcount(devvp) > 0) {
1114                         kprintf("Primary device already has references\n");
1115                         error = EBUSY;
1116                 }
1117
1118                 /*
1119                  * Now open the device
1120                  */
1121                 if (error == 0) {
1122                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1123                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1124                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
1125                         if (error == 0) {
1126                                 error = VOP_OPEN(devvp,
1127                                              (ronly ? FREAD : FREAD | FWRITE),
1128                                              FSCRED, NULL);
1129                         }
1130                         vn_unlock(devvp);
1131                 }
1132                 if (error && devvp) {
1133                         vrele(devvp);
1134                         devvp = NULL;
1135                 }
1136                 if (error) {
1137                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1138                         return error;
1139                 }
1140                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1141                 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1142                 hmp->ronly = ronly;
1143                 hmp->devvp = devvp;
1144                 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1145                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1146                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1147                 RB_INIT(&hmp->iotree);
1148                 spin_init(&hmp->io_spin, "hm2mount_io");
1149                 spin_init(&hmp->list_spin, "hm2mount_list");
1150                 TAILQ_INIT(&hmp->flushq);
1151
1152                 lockinit(&hmp->vollk, "h2vol", 0, 0);
1153                 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1154                 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1155
1156                 /*
1157                  * vchain setup. vchain.data is embedded.
1158                  * vchain.refs is initialized and will never drop to 0.
1159                  *
1160                  * NOTE! voldata is not yet loaded.
1161                  */
1162                 hmp->vchain.hmp = hmp;
1163                 hmp->vchain.refs = 1;
1164                 hmp->vchain.data = (void *)&hmp->voldata;
1165                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1166                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1167                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1168
1169                 hammer2_chain_core_init(&hmp->vchain);
1170                 /* hmp->vchain.u.xxx is left NULL */
1171
1172                 /*
1173                  * fchain setup.  fchain.data is embedded.
1174                  * fchain.refs is initialized and will never drop to 0.
1175                  *
1176                  * The data is not used but needs to be initialized to
1177                  * pass assertion muster.  We use this chain primarily
1178                  * as a placeholder for the freemap's top-level RBTREE
1179                  * so it does not interfere with the volume's topology
1180                  * RBTREE.
1181                  */
1182                 hmp->fchain.hmp = hmp;
1183                 hmp->fchain.refs = 1;
1184                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1185                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1186                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1187                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1188                 hmp->fchain.bref.methods =
1189                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1190                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1191
1192                 hammer2_chain_core_init(&hmp->fchain);
1193                 /* hmp->fchain.u.xxx is left NULL */
1194
1195                 /*
1196                  * Install the volume header and initialize fields from
1197                  * voldata.
1198                  */
1199                 error = hammer2_install_volume_header(hmp);
1200                 if (error) {
1201                         hammer2_unmount_helper(mp, NULL, hmp);
1202                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1203                         hammer2_vfs_unmount(mp, MNT_FORCE);
1204                         return error;
1205                 }
1206
1207                 /*
1208                  * Really important to get these right or flush will get
1209                  * confused.
1210                  */
1211                 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1212                 spmp = hmp->spmp;
1213
1214                 /*
1215                  * Dummy-up vchain and fchain's modify_tid.  mirror_tid
1216                  * is inherited from the volume header.
1217                  */
1218                 xid = 0;
1219                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1220                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1221                 hmp->vchain.pmp = spmp;
1222                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1223                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1224                 hmp->fchain.pmp = spmp;
1225
1226                 /*
1227                  * First locate the super-root inode, which is key 0
1228                  * relative to the volume header's blockset.
1229                  *
1230                  * Then locate the root inode by scanning the directory keyspace
1231                  * represented by the label.
1232                  */
1233                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1234                 schain = hammer2_chain_lookup(&parent, &key_dummy,
1235                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1236                                       &error, 0);
1237                 hammer2_chain_lookup_done(parent);
1238                 if (schain == NULL) {
1239                         kprintf("hammer2_mount: invalid super-root\n");
1240                         hammer2_unmount_helper(mp, NULL, hmp);
1241                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1242                         hammer2_vfs_unmount(mp, MNT_FORCE);
1243                         return EINVAL;
1244                 }
1245                 if (schain->error) {
1246                         kprintf("hammer2_mount: error %s reading super-root\n",
1247                                 hammer2_error_str(schain->error));
1248                         hammer2_chain_unlock(schain);
1249                         hammer2_chain_drop(schain);
1250                         schain = NULL;
1251                         hammer2_unmount_helper(mp, NULL, hmp);
1252                         lockmgr(&hammer2_mntlk, LK_RELEASE);
1253                         hammer2_vfs_unmount(mp, MNT_FORCE);
1254                         return EINVAL;
1255                 }
1256
1257                 /*
1258                  * The super-root always uses an inode_tid of 1 when
1259                  * creating PFSs.
1260                  */
1261                 spmp->inode_tid = 1;
1262                 spmp->modify_tid = schain->bref.modify_tid + 1;
1263
1264                 /*
1265                  * Sanity-check schain's pmp and finish initialization.
1266                  * Any chain belonging to the super-root topology should
1267                  * have a NULL pmp (not even set to spmp).
1268                  */
1269                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1270                 KKASSERT(schain->pmp == NULL);
1271                 spmp->pfs_clid = ripdata->meta.pfs_clid;
1272
1273                 /*
1274                  * Replace the dummy spmp->iroot with a real one.  It's
1275                  * easier to just do a wholesale replacement than to try
1276                  * to update the chain and fixup the iroot fields.
1277                  *
1278                  * The returned inode is locked with the supplied cluster.
1279                  */
1280                 cluster = hammer2_cluster_from_chain(schain);
1281                 hammer2_inode_drop(spmp->iroot);
1282                 spmp->iroot = NULL;
1283                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1284                 spmp->spmp_hmp = hmp;
1285                 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1286                 spmp->pfs_hmps[0] = hmp;
1287                 hammer2_inode_ref(spmp->iroot);
1288                 hammer2_inode_unlock(spmp->iroot);
1289                 hammer2_cluster_unlock(cluster);
1290                 hammer2_cluster_drop(cluster);
1291                 schain = NULL;
1292                 /* leave spmp->iroot with one ref */
1293
1294                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1295                         error = hammer2_recovery(hmp);
1296                         if (error == 0)
1297                                 error |= hammer2_fixup_pfses(hmp);
1298                         /* XXX do something with error */
1299                 }
1300                 hammer2_update_pmps(hmp);
1301                 hammer2_iocom_init(hmp);
1302                 hammer2_bulkfree_init(hmp);
1303
1304                 /*
1305                  * Ref the cluster management messaging descriptor.  The mount
1306                  * program deals with the other end of the communications pipe.
1307                  *
1308                  * Root mounts typically do not supply one.
1309                  */
1310                 if (info.cluster_fd >= 0) {
1311                         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1312                         if (fp) {
1313                                 hammer2_cluster_reconnect(hmp, fp);
1314                         } else {
1315                                 kprintf("hammer2_mount: bad cluster_fd!\n");
1316                         }
1317                 }
1318         } else {
1319                 spmp = hmp->spmp;
1320                 if (info.hflags & HMNT2_DEVFLAGS) {
1321                         kprintf("hammer2: Warning: mount flags pertaining "
1322                                 "to the whole device may only be specified "
1323                                 "on the first mount of the device: %08x\n",
1324                                 info.hflags & HMNT2_DEVFLAGS);
1325                 }
1326         }
1327
1328         /*
1329          * Force local mount (disassociate all PFSs from their clusters).
1330          * Used primarily for debugging.
1331          */
1332         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1333
1334         /*
1335          * Lookup the mount point under the media-localized super-root.
1336          * Scanning hammer2_pfslist doesn't help us because it represents
1337          * PFS cluster ids which can aggregate several named PFSs together.
1338          *
1339          * cluster->pmp will incorrectly point to spmp and must be fixed
1340          * up later on.
1341          */
1342         hammer2_inode_lock(spmp->iroot, 0);
1343         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1344         lhc = hammer2_dirhash(label, strlen(label));
1345         chain = hammer2_chain_lookup(&parent, &key_next,
1346                                      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1347                                      &error, 0);
1348         while (chain) {
1349                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1350                     strcmp(label, chain->data->ipdata.filename) == 0) {
1351                         break;
1352                 }
1353                 chain = hammer2_chain_next(&parent, chain, &key_next,
1354                                             key_next,
1355                                             lhc + HAMMER2_DIRHASH_LOMASK,
1356                                             &error, 0);
1357         }
1358         if (parent) {
1359                 hammer2_chain_unlock(parent);
1360                 hammer2_chain_drop(parent);
1361         }
1362         hammer2_inode_unlock(spmp->iroot);
1363
1364         /*
1365          * PFS could not be found?
1366          */
1367         if (chain == NULL) {
1368                 if (error)
1369                         kprintf("hammer2_mount: PFS label I/O error\n");
1370                 else
1371                         kprintf("hammer2_mount: PFS label not found\n");
1372                 hammer2_unmount_helper(mp, NULL, hmp);
1373                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1374                 hammer2_vfs_unmount(mp, MNT_FORCE);
1375
1376                 return EINVAL;
1377         }
1378
1379         /*
1380          * Acquire the pmp structure (it should have already been allocated
1381          * via hammer2_update_pmps() so do not pass cluster in to add to
1382          * available chains).
1383          *
1384          * Check if the cluster has already been mounted.  A cluster can
1385          * only be mounted once, use null mounts to mount additional copies.
1386          */
1387         if (chain->error) {
1388                 kprintf("hammer2_mount: PFS label I/O error\n");
1389         } else {
1390                 ripdata = &chain->data->ipdata;
1391                 bref = chain->bref;
1392                 pmp = hammer2_pfsalloc(NULL, ripdata,
1393                                        bref.modify_tid, force_local);
1394         }
1395         hammer2_chain_unlock(chain);
1396         hammer2_chain_drop(chain);
1397
1398         /*
1399          * Finish the mount
1400          */
1401         kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1402
1403         if (pmp->mp) {
1404                 kprintf("hammer2_mount: PFS already mounted!\n");
1405                 hammer2_unmount_helper(mp, NULL, hmp);
1406                 lockmgr(&hammer2_mntlk, LK_RELEASE);
1407                 hammer2_vfs_unmount(mp, MNT_FORCE);
1408
1409                 return EBUSY;
1410         }
1411
1412         pmp->hflags = info.hflags;
1413         mp->mnt_flag |= MNT_LOCAL;
1414         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
1415         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
1416
1417         /*
1418          * required mount structure initializations
1419          */
1420         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1421         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1422
1423         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1424         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1425
1426         /*
1427          * Optional fields
1428          */
1429         mp->mnt_iosize_max = MAXPHYS;
1430
1431         /*
1432          * Connect up mount pointers.
1433          */
1434         hammer2_mount_helper(mp, pmp);
1435
1436         lockmgr(&hammer2_mntlk, LK_RELEASE);
1437
1438         /*
1439          * Finish setup
1440          */
1441         vfs_getnewfsid(mp);
1442         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1443         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1444         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1445
1446         if (path) {
1447                 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1448                           MNAMELEN - 1, &size);
1449                 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1450         } /* else root mount, already in there */
1451
1452         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1453         if (path) {
1454                 copyinstr(path, mp->mnt_stat.f_mntonname,
1455                           sizeof(mp->mnt_stat.f_mntonname) - 1,
1456                           &size);
1457         } else {
1458                 /* root mount */
1459                 mp->mnt_stat.f_mntonname[0] = '/';
1460         }
1461
1462         /*
1463          * Initial statfs to prime mnt_stat.
1464          */
1465         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1466
1467         return 0;
1468 }
1469
1470 /*
1471  * Scan PFSs under the super-root and create hammer2_pfs structures.
1472  */
1473 static
1474 void
1475 hammer2_update_pmps(hammer2_dev_t *hmp)
1476 {
1477         const hammer2_inode_data_t *ripdata;
1478         hammer2_chain_t *parent;
1479         hammer2_chain_t *chain;
1480         hammer2_blockref_t bref;
1481         hammer2_dev_t *force_local;
1482         hammer2_pfs_t *spmp;
1483         hammer2_pfs_t *pmp;
1484         hammer2_key_t key_next;
1485         int error;
1486
1487         /*
1488          * Force local mount (disassociate all PFSs from their clusters).
1489          * Used primarily for debugging.
1490          */
1491         force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1492
1493         /*
1494          * Lookup mount point under the media-localized super-root.
1495          *
1496          * cluster->pmp will incorrectly point to spmp and must be fixed
1497          * up later on.
1498          */
1499         spmp = hmp->spmp;
1500         hammer2_inode_lock(spmp->iroot, 0);
1501         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1502         chain = hammer2_chain_lookup(&parent, &key_next,
1503                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1504                                          &error, 0);
1505         while (chain) {
1506                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1507                         continue;
1508                 if (chain->error) {
1509                         kprintf("I/O error scanning PFS labels\n");
1510                 } else {
1511                         ripdata = &chain->data->ipdata;
1512                         bref = chain->bref;
1513
1514                         pmp = hammer2_pfsalloc(chain, ripdata,
1515                                                bref.modify_tid, force_local);
1516                 }
1517                 chain = hammer2_chain_next(&parent, chain, &key_next,
1518                                            key_next, HAMMER2_KEY_MAX,
1519                                            &error, 0);
1520         }
1521         if (parent) {
1522                 hammer2_chain_unlock(parent);
1523                 hammer2_chain_drop(parent);
1524         }
1525         hammer2_inode_unlock(spmp->iroot);
1526 }
1527
1528 static
1529 int
1530 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1531                 struct vnode *devvp, struct ucred *cred)
1532 {
1533         int error;
1534
1535         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1536                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1537                 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1538                 vn_unlock(devvp);
1539                 error = hammer2_recovery(hmp);
1540                 if (error == 0)
1541                         error |= hammer2_fixup_pfses(hmp);
1542                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1543                 if (error == 0) {
1544                         VOP_CLOSE(devvp, FREAD, NULL);
1545                         hmp->ronly = 0;
1546                 } else {
1547                         VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1548                 }
1549                 vn_unlock(devvp);
1550         } else {
1551                 error = 0;
1552         }
1553         return error;
1554 }
1555
1556 static
1557 int
1558 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1559 {
1560         hammer2_pfs_t *pmp;
1561         int flags;
1562         int error = 0;
1563
1564         pmp = MPTOPMP(mp);
1565
1566         if (pmp == NULL)
1567                 return(0);
1568
1569         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1570
1571         /*
1572          * If mount initialization proceeded far enough we must flush
1573          * its vnodes and sync the underlying mount points.  Three syncs
1574          * are required to fully flush the filesystem (freemap updates lag
1575          * by one flush, and one extra for safety).
1576          */
1577         if (mntflags & MNT_FORCE)
1578                 flags = FORCECLOSE;
1579         else
1580                 flags = 0;
1581         if (pmp->iroot) {
1582                 error = vflush(mp, 0, flags);
1583                 if (error)
1584                         goto failed;
1585                 hammer2_vfs_sync(mp, MNT_WAIT);
1586                 hammer2_vfs_sync(mp, MNT_WAIT);
1587                 hammer2_vfs_sync(mp, MNT_WAIT);
1588         }
1589
1590         /*
1591          * Cleanup the frontend support XOPS threads
1592          */
1593         hammer2_xop_helper_cleanup(pmp);
1594
1595         if (pmp->mp)
1596                 hammer2_unmount_helper(mp, pmp, NULL);
1597
1598         error = 0;
1599 failed:
1600         lockmgr(&hammer2_mntlk, LK_RELEASE);
1601
1602         return (error);
1603 }
1604
1605 /*
1606  * Mount helper, hook the system mount into our PFS.
1607  * The mount lock is held.
1608  *
1609  * We must bump the mount_count on related devices for any
1610  * mounted PFSs.
1611  */
1612 static
1613 void
1614 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1615 {
1616         hammer2_cluster_t *cluster;
1617         hammer2_chain_t *rchain;
1618         int i;
1619
1620         mp->mnt_data = (qaddr_t)pmp;
1621         pmp->mp = mp;
1622
1623         /*
1624          * After pmp->mp is set we have to adjust hmp->mount_count.
1625          */
1626         cluster = &pmp->iroot->cluster;
1627         for (i = 0; i < cluster->nchains; ++i) {
1628                 rchain = cluster->array[i].chain;
1629                 if (rchain == NULL)
1630                         continue;
1631                 ++rchain->hmp->mount_count;
1632         }
1633
1634         /*
1635          * Create missing Xop threads
1636          */
1637         hammer2_xop_helper_create(pmp);
1638 }
1639
1640 /*
1641  * Mount helper, unhook the system mount from our PFS.
1642  * The mount lock is held.
1643  *
1644  * If hmp is supplied a mount responsible for being the first to open
1645  * the block device failed and the block device and all PFSs using the
1646  * block device must be cleaned up.
1647  *
1648  * If pmp is supplied multiple devices might be backing the PFS and each
1649  * must be disconnected.  This might not be the last PFS using some of the
1650  * underlying devices.  Also, we have to adjust our hmp->mount_count
1651  * accounting for the devices backing the pmp which is now undergoing an
1652  * unmount.
1653  */
1654 static
1655 void
1656 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1657 {
1658         hammer2_cluster_t *cluster;
1659         hammer2_chain_t *rchain;
1660         struct vnode *devvp;
1661         int dumpcnt;
1662         int ronly;
1663         int i;
1664
1665         /*
1666          * If no device supplied this is a high-level unmount and we have to
1667          * to disconnect the mount, adjust mount_count, and locate devices
1668          * that might now have no mounts.
1669          */
1670         if (pmp) {
1671                 KKASSERT(hmp == NULL);
1672                 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1673                 pmp->mp = NULL;
1674                 mp->mnt_data = NULL;
1675
1676                 /*
1677                  * After pmp->mp is cleared we have to account for
1678                  * mount_count.
1679                  */
1680                 cluster = &pmp->iroot->cluster;
1681                 for (i = 0; i < cluster->nchains; ++i) {
1682                         rchain = cluster->array[i].chain;
1683                         if (rchain == NULL)
1684                                 continue;
1685                         --rchain->hmp->mount_count;
1686                         /* scrapping hmp now may invalidate the pmp */
1687                 }
1688 again:
1689                 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1690                         if (hmp->mount_count == 0) {
1691                                 hammer2_unmount_helper(NULL, NULL, hmp);
1692                                 goto again;
1693                         }
1694                 }
1695                 return;
1696         }
1697
1698         /*
1699          * Try to terminate the block device.  We can't terminate it if
1700          * there are still PFSs referencing it.
1701          */
1702         if (hmp->mount_count)
1703                 return;
1704
1705         /*
1706          * Decomission the network before we start messing with the
1707          * device and PFS.
1708          */
1709         hammer2_iocom_uninit(hmp);
1710
1711         hammer2_bulkfree_uninit(hmp);
1712         hammer2_pfsfree_scan(hmp, 0);
1713         hammer2_dev_exlock(hmp);        /* XXX order */
1714
1715         /*
1716          * Cycle the volume data lock as a safety (probably not needed any
1717          * more).  To ensure everything is out we need to flush at least
1718          * three times.  (1) The running of the sideq can dirty the
1719          * filesystem, (2) A normal flush can dirty the freemap, and
1720          * (3) ensure that the freemap is fully synchronized.
1721          *
1722          * The next mount's recovery scan can clean everything up but we want
1723          * to leave the filesystem in a 100% clean state on a normal unmount.
1724          */
1725 #if 0
1726         hammer2_voldata_lock(hmp);
1727         hammer2_voldata_unlock(hmp);
1728 #endif
1729
1730         /*
1731          * Flush whatever is left.  Unmounted but modified PFS's might still
1732          * have some dirty chains on them.
1733          */
1734         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1735         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1736
1737         if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1738                 hammer2_voldata_modify(hmp);
1739                 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1740                                             HAMMER2_FLUSH_ALL);
1741         }
1742         hammer2_chain_unlock(&hmp->fchain);
1743
1744         if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1745                 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1746                                             HAMMER2_FLUSH_ALL);
1747         }
1748         hammer2_chain_unlock(&hmp->vchain);
1749
1750         if ((hmp->vchain.flags | hmp->fchain.flags) &
1751             HAMMER2_CHAIN_FLUSH_MASK) {
1752                 kprintf("hammer2_unmount: chains left over "
1753                         "after final sync\n");
1754                 kprintf("    vchain %08x\n", hmp->vchain.flags);
1755                 kprintf("    fchain %08x\n", hmp->fchain.flags);
1756
1757                 if (hammer2_debug & 0x0010)
1758                         Debugger("entered debugger");
1759         }
1760
1761         hammer2_pfsfree_scan(hmp, 1);
1762
1763         KKASSERT(hmp->spmp == NULL);
1764
1765         /*
1766          * Finish up with the device vnode
1767          */
1768         if ((devvp = hmp->devvp) != NULL) {
1769                 ronly = hmp->ronly;
1770                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1771                 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1772                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1773                         ronly);
1774                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1775                 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1776                         hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1777                 hmp->devvp = NULL;
1778                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1779                 vn_unlock(devvp);
1780                 vrele(devvp);
1781                 devvp = NULL;
1782         }
1783
1784         /*
1785          * Clear vchain/fchain flags that might prevent final cleanup
1786          * of these chains.
1787          */
1788         if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1789                 atomic_add_long(&hammer2_count_modified_chains, -1);
1790                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1791                 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1792         }
1793         if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1794                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1795         }
1796
1797         if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1798                 atomic_add_long(&hammer2_count_modified_chains, -1);
1799                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1800                 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1801         }
1802         if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1803                 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1804         }
1805
1806         /*
1807          * Final drop of embedded freemap root chain to
1808          * clean up fchain.core (fchain structure is not
1809          * flagged ALLOCATED so it is cleaned out and then
1810          * left to rot).
1811          */
1812         hammer2_chain_drop(&hmp->fchain);
1813
1814         /*
1815          * Final drop of embedded volume root chain to clean
1816          * up vchain.core (vchain structure is not flagged
1817          * ALLOCATED so it is cleaned out and then left to
1818          * rot).
1819          */
1820         dumpcnt = 50;
1821         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1);
1822         dumpcnt = 50;
1823         hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1);
1824         hammer2_dev_unlock(hmp);
1825         hammer2_chain_drop(&hmp->vchain);
1826
1827         hammer2_io_cleanup(hmp, &hmp->iotree);
1828         if (hmp->iofree_count) {
1829                 kprintf("io_cleanup: %d I/O's left hanging\n",
1830                         hmp->iofree_count);
1831         }
1832
1833         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1834         kmalloc_destroy(&hmp->mchain);
1835         kfree(hmp, M_HAMMER2);
1836 }
1837
1838 int
1839 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1840                  ino_t ino, struct vnode **vpp)
1841 {
1842         hammer2_xop_lookup_t *xop;
1843         hammer2_pfs_t *pmp;
1844         hammer2_inode_t *ip;
1845         hammer2_tid_t inum;
1846         int error;
1847
1848         inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1849
1850         error = 0;
1851         pmp = MPTOPMP(mp);
1852
1853         /*
1854          * Easy if we already have it cached
1855          */
1856         ip = hammer2_inode_lookup(pmp, inum);
1857         if (ip) {
1858                 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1859                 *vpp = hammer2_igetv(ip, &error);
1860                 hammer2_inode_unlock(ip);
1861                 hammer2_inode_drop(ip);         /* from lookup */
1862
1863                 return error;
1864         }
1865
1866         /*
1867          * Otherwise we have to find the inode
1868          */
1869         xop = hammer2_xop_alloc(pmp->iroot, 0);
1870         xop->lhc = inum;
1871         hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1872         error = hammer2_xop_collect(&xop->head, 0);
1873
1874         if (error == 0) {
1875                 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1876                         kprintf("vget: no collect error but also no rdata\n");
1877                         kprintf("xop %p\n", xop);
1878                         while ((hammer2_debug & 0x80000) == 0) {
1879                                 tsleep(xop, PCATCH, "wait", hz * 10);
1880                         }
1881                         ip = NULL;
1882                 } else {
1883                         ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1884                 }
1885         }
1886         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1887
1888         if (ip) {
1889                 *vpp = hammer2_igetv(ip, &error);
1890                 hammer2_inode_unlock(ip);
1891         } else {
1892                 *vpp = NULL;
1893                 error = ENOENT;
1894         }
1895         return (error);
1896 }
1897
1898 static
1899 int
1900 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1901 {
1902         hammer2_pfs_t *pmp;
1903         struct vnode *vp;
1904         int error;
1905
1906         pmp = MPTOPMP(mp);
1907         if (pmp->iroot == NULL) {
1908                 *vpp = NULL;
1909                 return EINVAL;
1910         }
1911
1912         error = 0;
1913         hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1914
1915         while (pmp->inode_tid == 0) {
1916                 hammer2_xop_ipcluster_t *xop;
1917                 hammer2_inode_meta_t *meta;
1918
1919                 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1920                 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1921                 error = hammer2_xop_collect(&xop->head, 0);
1922
1923                 if (error == 0) {
1924                         meta = &xop->head.cluster.focus->data->ipdata.meta;
1925                         pmp->iroot->meta = *meta;
1926                         pmp->inode_tid = meta->pfs_inum + 1;
1927                         if (pmp->inode_tid < HAMMER2_INODE_START)
1928                                 pmp->inode_tid = HAMMER2_INODE_START;
1929                         pmp->modify_tid =
1930                                 xop->head.cluster.focus->bref.modify_tid + 1;
1931 #if 0
1932                         kprintf("PFS: Starting inode %jd\n",
1933                                 (intmax_t)pmp->inode_tid);
1934                         kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1935                                 pmp->inode_tid, pmp->modify_tid);
1936 #endif
1937                         wakeup(&pmp->iroot);
1938
1939                         hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1940
1941                         /*
1942                          * Prime the mount info.
1943                          */
1944                         hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1945                         break;
1946                 }
1947
1948                 /*
1949                  * Loop, try again
1950                  */
1951                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1952                 hammer2_inode_unlock(pmp->iroot);
1953                 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1954                 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1955                 if (error == EINTR)
1956                         break;
1957         }
1958
1959         if (error) {
1960                 hammer2_inode_unlock(pmp->iroot);
1961                 *vpp = NULL;
1962         } else {
1963                 vp = hammer2_igetv(pmp->iroot, &error);
1964                 hammer2_inode_unlock(pmp->iroot);
1965                 *vpp = vp;
1966         }
1967
1968         return (error);
1969 }
1970
1971 /*
1972  * Filesystem status
1973  *
1974  * XXX incorporate ipdata->meta.inode_quota and data_quota
1975  */
1976 static
1977 int
1978 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1979 {
1980         hammer2_pfs_t *pmp;
1981         hammer2_dev_t *hmp;
1982         hammer2_blockref_t bref;
1983         struct statfs tmp;
1984         int i;
1985
1986         /*
1987          * NOTE: iroot might not have validated the cluster yet.
1988          */
1989         pmp = MPTOPMP(mp);
1990
1991         bzero(&tmp, sizeof(tmp));
1992
1993         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1994                 hmp = pmp->pfs_hmps[i];
1995                 if (hmp == NULL)
1996                         continue;
1997                 if (pmp->iroot->cluster.array[i].chain)
1998                         bref = pmp->iroot->cluster.array[i].chain->bref;
1999                 else
2000                         bzero(&bref, sizeof(bref));
2001
2002                 tmp.f_files = bref.embed.stats.inode_count;
2003                 tmp.f_ffree = 0;
2004                 tmp.f_blocks = hmp->voldata.allocator_size /
2005                                mp->mnt_vstat.f_bsize;
2006                 tmp.f_bfree = hmp->voldata.allocator_free /
2007                               mp->mnt_vstat.f_bsize;
2008                 tmp.f_bavail = tmp.f_bfree;
2009
2010                 if (cred && cred->cr_uid != 0) {
2011                         uint64_t adj;
2012
2013                         /* 5% */
2014                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2015                         tmp.f_blocks -= adj;
2016                         tmp.f_bfree -= adj;
2017                         tmp.f_bavail -= adj;
2018                 }
2019
2020                 mp->mnt_stat.f_blocks = tmp.f_blocks;
2021                 mp->mnt_stat.f_bfree = tmp.f_bfree;
2022                 mp->mnt_stat.f_bavail = tmp.f_bavail;
2023                 mp->mnt_stat.f_files = tmp.f_files;
2024                 mp->mnt_stat.f_ffree = tmp.f_ffree;
2025
2026                 *sbp = mp->mnt_stat;
2027         }
2028         return (0);
2029 }
2030
2031 static
2032 int
2033 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2034 {
2035         hammer2_pfs_t *pmp;
2036         hammer2_dev_t *hmp;
2037         hammer2_blockref_t bref;
2038         struct statvfs tmp;
2039         int i;
2040
2041         /*
2042          * NOTE: iroot might not have validated the cluster yet.
2043          */
2044         pmp = MPTOPMP(mp);
2045         bzero(&tmp, sizeof(tmp));
2046
2047         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2048                 hmp = pmp->pfs_hmps[i];
2049                 if (hmp == NULL)
2050                         continue;
2051                 if (pmp->iroot->cluster.array[i].chain)
2052                         bref = pmp->iroot->cluster.array[i].chain->bref;
2053                 else
2054                         bzero(&bref, sizeof(bref));
2055
2056                 tmp.f_files = bref.embed.stats.inode_count;
2057                 tmp.f_ffree = 0;
2058                 tmp.f_blocks = hmp->voldata.allocator_size /
2059                                mp->mnt_vstat.f_bsize;
2060                 tmp.f_bfree = hmp->voldata.allocator_free /
2061                               mp->mnt_vstat.f_bsize;
2062                 tmp.f_bavail = tmp.f_bfree;
2063
2064                 if (cred && cred->cr_uid != 0) {
2065                         uint64_t adj;
2066
2067                         /* 5% */
2068                         adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2069                         tmp.f_blocks -= adj;
2070                         tmp.f_bfree -= adj;
2071                         tmp.f_bavail -= adj;
2072                 }
2073
2074                 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2075                 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2076                 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2077                 mp->mnt_vstat.f_files = tmp.f_files;
2078                 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2079
2080                 *sbp = mp->mnt_vstat;
2081         }
2082         return (0);
2083 }
2084
2085 /*
2086  * Mount-time recovery (RW mounts)
2087  *
2088  * Updates to the free block table are allowed to lag flushes by one
2089  * transaction.  In case of a crash, then on a fresh mount we must do an
2090  * incremental scan of the last committed transaction id and make sure that
2091  * all related blocks have been marked allocated.
2092  *
2093  * The super-root topology and each PFS has its own transaction id domain,
2094  * so we must track PFS boundary transitions.
2095  */
2096 struct hammer2_recovery_elm {
2097         TAILQ_ENTRY(hammer2_recovery_elm) entry;
2098         hammer2_chain_t *chain;
2099         hammer2_tid_t sync_tid;
2100 };
2101
2102 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2103
2104 struct hammer2_recovery_info {
2105         struct hammer2_recovery_list list;
2106         hammer2_tid_t   mtid;
2107         int     depth;
2108 };
2109
2110 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2111                         hammer2_chain_t *parent,
2112                         struct hammer2_recovery_info *info,
2113                         hammer2_tid_t sync_tid);
2114
2115 #define HAMMER2_RECOVERY_MAXDEPTH       10
2116
2117 static
2118 int
2119 hammer2_recovery(hammer2_dev_t *hmp)
2120 {
2121         struct hammer2_recovery_info info;
2122         struct hammer2_recovery_elm *elm;
2123         hammer2_chain_t *parent;
2124         hammer2_tid_t sync_tid;
2125         hammer2_tid_t mirror_tid;
2126         int error;
2127
2128         hammer2_trans_init(hmp->spmp, 0);
2129
2130         sync_tid = hmp->voldata.freemap_tid;
2131         mirror_tid = hmp->voldata.mirror_tid;
2132
2133         kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2134         if (sync_tid >= mirror_tid) {
2135                 kprintf(" no recovery needed\n");
2136         } else {
2137                 kprintf(" freemap recovery %016jx-%016jx\n",
2138                         sync_tid + 1, mirror_tid);
2139         }
2140
2141         TAILQ_INIT(&info.list);
2142         info.depth = 0;
2143         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2144         error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2145         hammer2_chain_lookup_done(parent);
2146
2147         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2148                 TAILQ_REMOVE(&info.list, elm, entry);
2149                 parent = elm->chain;
2150                 sync_tid = elm->sync_tid;
2151                 kfree(elm, M_HAMMER2);
2152
2153                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2154                 error |= hammer2_recovery_scan(hmp, parent, &info,
2155                                               hmp->voldata.freemap_tid);
2156                 hammer2_chain_unlock(parent);
2157                 hammer2_chain_drop(parent);     /* drop elm->chain ref */
2158         }
2159
2160         hammer2_trans_done(hmp->spmp);
2161
2162         return error;
2163 }
2164
2165 static
2166 int
2167 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2168                       struct hammer2_recovery_info *info,
2169                       hammer2_tid_t sync_tid)
2170 {
2171         const hammer2_inode_data_t *ripdata;
2172         hammer2_chain_t *chain;
2173         hammer2_blockref_t bref;
2174         int tmp_error;
2175         int rup_error;
2176         int error;
2177         int first;
2178
2179         /*
2180          * Adjust freemap to ensure that the block(s) are marked allocated.
2181          */
2182         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2183                 hammer2_freemap_adjust(hmp, &parent->bref,
2184                                        HAMMER2_FREEMAP_DORECOVER);
2185         }
2186
2187         /*
2188          * Check type for recursive scan
2189          */
2190         switch(parent->bref.type) {
2191         case HAMMER2_BREF_TYPE_VOLUME:
2192                 /* data already instantiated */
2193                 break;
2194         case HAMMER2_BREF_TYPE_INODE:
2195                 /*
2196                  * Must instantiate data for DIRECTDATA test and also
2197                  * for recursion.
2198                  */
2199                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2200                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2201                 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2202                         /* not applicable to recovery scan */
2203                         hammer2_chain_unlock(parent);
2204                         return 0;
2205                 }
2206                 hammer2_chain_unlock(parent);
2207                 break;
2208         case HAMMER2_BREF_TYPE_INDIRECT:
2209                 /*
2210                  * Must instantiate data for recursion
2211                  */
2212                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2213                 hammer2_chain_unlock(parent);
2214                 break;
2215         case HAMMER2_BREF_TYPE_DIRENT:
2216         case HAMMER2_BREF_TYPE_DATA:
2217         case HAMMER2_BREF_TYPE_FREEMAP:
2218         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2219         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2220                 /* not applicable to recovery scan */
2221                 return 0;
2222                 break;
2223         default:
2224                 return HAMMER2_ERROR_BADBREF;
2225         }
2226
2227         /*
2228          * Defer operation if depth limit reached or if we are crossing a
2229          * PFS boundary.
2230          */
2231         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2232                 struct hammer2_recovery_elm *elm;
2233
2234                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2235                 elm->chain = parent;
2236                 elm->sync_tid = sync_tid;
2237                 hammer2_chain_ref(parent);
2238                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2239                 /* unlocked by caller */
2240
2241                 return(0);
2242         }
2243
2244
2245         /*
2246          * Recursive scan of the last flushed transaction only.  We are
2247          * doing this without pmp assignments so don't leave the chains
2248          * hanging around after we are done with them.
2249          *
2250          * error        Cumulative error this level only
2251          * rup_error    Cumulative error for recursion
2252          * tmp_error    Specific non-cumulative recursion error
2253          */
2254         chain = NULL;
2255         first = 1;
2256         rup_error = 0;
2257         error = 0;
2258
2259         for (;;) {
2260                 error |= hammer2_chain_scan(parent, &chain, &bref,
2261                                             &first,
2262                                             HAMMER2_LOOKUP_NODATA);
2263
2264                 /*
2265                  * Problem during scan or EOF
2266                  */
2267                 if (error)
2268                         break;
2269
2270                 /*
2271                  * If this is a leaf
2272                  */
2273                 if (chain == NULL) {
2274                         if (bref.mirror_tid > sync_tid) {
2275                                 hammer2_freemap_adjust(hmp, &bref,
2276                                                      HAMMER2_FREEMAP_DORECOVER);
2277                         }
2278                         continue;
2279                 }
2280
2281                 /*
2282                  * This may or may not be a recursive node.
2283                  */
2284                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2285                 if (bref.mirror_tid > sync_tid) {
2286                         ++info->depth;
2287                         tmp_error = hammer2_recovery_scan(hmp, chain,
2288                                                            info, sync_tid);
2289                         --info->depth;
2290                 } else {
2291                         tmp_error = 0;
2292                 }
2293
2294                 /*
2295                  * Flush the recovery at the PFS boundary to stage it for
2296                  * the final flush of the super-root topology.
2297                  */
2298                 if (tmp_error == 0 &&
2299                     (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2300                     (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2301                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2302                                              HAMMER2_FLUSH_ALL);
2303                 }
2304                 rup_error |= tmp_error;
2305         }
2306         return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2307 }
2308
2309 /*
2310  * This fixes up an error introduced in earlier H2 implementations where
2311  * moving a PFS inode into an indirect block wound up causing the
2312  * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2313  */
2314 static
2315 int
2316 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2317 {
2318         const hammer2_inode_data_t *ripdata;
2319         hammer2_chain_t *parent;
2320         hammer2_chain_t *chain;
2321         hammer2_key_t key_next;
2322         hammer2_pfs_t *spmp;
2323         int error;
2324
2325         error = 0;
2326
2327         /*
2328          * Lookup mount point under the media-localized super-root.
2329          *
2330          * cluster->pmp will incorrectly point to spmp and must be fixed
2331          * up later on.
2332          */
2333         spmp = hmp->spmp;
2334         hammer2_inode_lock(spmp->iroot, 0);
2335         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2336         chain = hammer2_chain_lookup(&parent, &key_next,
2337                                          HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2338                                          &error, 0);
2339         while (chain) {
2340                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2341                         continue;
2342                 if (chain->error) {
2343                         kprintf("I/O error scanning PFS labels\n");
2344                         error |= chain->error;
2345                 } else if ((chain->bref.flags &
2346                             HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2347                         int error2;
2348
2349                         ripdata = &chain->data->ipdata;
2350                         hammer2_trans_init(hmp->spmp, 0);
2351                         error2 = hammer2_chain_modify(chain,
2352                                                       chain->bref.modify_tid,
2353                                                       0, 0);
2354                         if (error2 == 0) {
2355                                 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2356                                         ripdata->filename);
2357                                 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2358                         } else {
2359                                 error |= error2;
2360                         }
2361                         hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2362                                              HAMMER2_FLUSH_ALL);
2363                         hammer2_trans_done(hmp->spmp);
2364                 }
2365                 chain = hammer2_chain_next(&parent, chain, &key_next,
2366                                            key_next, HAMMER2_KEY_MAX,
2367                                            &error, 0);
2368         }
2369         if (parent) {
2370                 hammer2_chain_unlock(parent);
2371                 hammer2_chain_drop(parent);
2372         }
2373         hammer2_inode_unlock(spmp->iroot);
2374
2375         return error;
2376 }
2377
2378 /*
2379  * Sync a mount point; this is called periodically on a per-mount basis from
2380  * the filesystem syncer, and whenever a user issues a sync.
2381  */
2382 int
2383 hammer2_vfs_sync(struct mount *mp, int waitfor)
2384 {
2385         hammer2_xop_flush_t *xop;
2386         struct hammer2_sync_info info;
2387         hammer2_inode_t *iroot;
2388         hammer2_pfs_t *pmp;
2389         int flags;
2390         int error;
2391
2392         pmp = MPTOPMP(mp);
2393         iroot = pmp->iroot;
2394         KKASSERT(iroot);
2395         KKASSERT(iroot->pmp == pmp);
2396
2397         /*
2398          * We can't acquire locks on existing vnodes while in a transaction
2399          * without risking a deadlock.  This assumes that vfsync() can be
2400          * called without the vnode locked (which it can in DragonFly).
2401          * Otherwise we'd have to implement a multi-pass or flag the lock
2402          * failures and retry.
2403          *
2404          * The reclamation code interlocks with the sync list's token
2405          * (by removing the vnode from the scan list) before unlocking
2406          * the inode, giving us time to ref the inode.
2407          */
2408         /*flags = VMSC_GETVP;*/
2409         flags = 0;
2410         if (waitfor & MNT_LAZY)
2411                 flags |= VMSC_ONEPASS;
2412
2413         /*
2414          * Flush vnodes individually using a normal transaction to avoid
2415          * stalling any concurrent operations.  This will flush the related
2416          * buffer cache buffers and inodes to the media.
2417          *
2418          * For efficiency do an async pass before making sure with a
2419          * synchronous pass on all related buffer cache buffers.
2420          */
2421         hammer2_trans_init(pmp, 0);
2422
2423         info.error = 0;
2424
2425         info.waitfor = MNT_NOWAIT;
2426         info.pass = 1;
2427         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2428
2429         /*
2430          * Now do two passes making sure we get everything.  The first pass
2431          * vfsync()s dirty vnodes.  The second pass waits for their I/O's
2432          * to finish and cleans up the dirty flag on the vnode.
2433          */
2434         info.pass = 1;
2435         info.waitfor = MNT_WAIT;
2436         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2437
2438         info.pass = 2;
2439         info.waitfor = MNT_WAIT;
2440         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2441
2442         /*
2443          * We must also run the sideq to handle any disconnected inodes
2444          * as the vnode scan will not see these.
2445          */
2446         hammer2_inode_run_sideq(pmp, 1);
2447         hammer2_trans_done(pmp);
2448
2449         /*
2450          * Start our flush transaction and flush the root topology down to
2451          * the inodes, but not the inodes themselves (which we already flushed
2452          * above).  Any concurrent activity effecting inode contents will not
2453          *
2454          * The flush sequence will
2455          *
2456          * NOTE! It is still possible for the paging code to push pages
2457          *       out via a UIO_NOCOPY hammer2_vop_write() during the main
2458          *       flush.
2459          */
2460         hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2461
2462         /*
2463          * sync dirty vnodes again while in the flush transaction.  This is
2464          * currently an expensive shim to makre sure the logical topology is
2465          * completely consistent before we flush the volume header.
2466          */
2467         info.pass = 1;
2468         info.waitfor = MNT_WAIT;
2469         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2470
2471         info.pass = 2;
2472         info.waitfor = MNT_WAIT;
2473         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2474
2475         /*
2476          * Use the XOP interface to concurrently flush all nodes to
2477          * synchronize the PFSROOT subtopology to the media.  A standard
2478          * end-of-scan ENOENT error indicates cluster sufficiency.
2479          *
2480          * Note that this flush will not be visible on crash recovery until
2481          * we flush the super-root topology in the next loop.
2482          *
2483          * XXX For now wait for all flushes to complete.
2484          */
2485         if (iroot) {
2486                 /*
2487                  * If unmounting try to flush everything including any
2488                  * sub-trees under inodes, just in case there is dangling
2489                  * modified data, as a safety.  Otherwise just flush up to
2490                  * the inodes in this stage.
2491                  */
2492                 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
2493                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2494                                                        HAMMER2_XOP_VOLHDR);
2495                 } else {
2496                         xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2497                                                        HAMMER2_XOP_INODE_STOP |
2498                                                        HAMMER2_XOP_VOLHDR);
2499                 }
2500                 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2501                 error = hammer2_xop_collect(&xop->head,
2502                                             HAMMER2_XOP_COLLECT_WAITALL);
2503                 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2504                 if (error == HAMMER2_ERROR_ENOENT)
2505                         error = 0;
2506                 else
2507                         error = hammer2_error_to_errno(error);
2508         } else {
2509                 error = 0;
2510         }
2511         hammer2_trans_done(pmp);
2512
2513         return (error);
2514 }
2515
2516 /*
2517  * Sync passes.
2518  *
2519  * Note that we ignore the tranasction mtid we got above.  Instead,
2520  * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2521  * transactions.
2522  *
2523  * WARNING! The frontend might be waiting on chnmem (limit_dirty_chains)
2524  * while holding a vnode locked.  When this situation occurs we cannot
2525  * safely test whether it is ok to clear the dirty bit on the vnode.
2526  * However, we can still flush the inode's topology.
2527  */
2528 static int
2529 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2530 {
2531         struct hammer2_sync_info *info = data;
2532         hammer2_inode_t *ip;
2533         int error;
2534
2535         /*
2536          * Degenerate cases.  Note that ip == NULL typically means the
2537          * syncer vnode itself and we don't want to vclrisdirty() in that
2538          * situation.
2539          */
2540         ip = VTOI(vp);
2541         if (ip == NULL) {
2542                 return(0);
2543         }
2544         if (vp->v_type == VNON || vp->v_type == VBAD) {
2545                 vclrisdirty(vp);
2546                 return(0);
2547         }
2548
2549         /*
2550          * Synchronize the buffer cche and inode meta-data to the backing
2551          * chain topology.
2552          *
2553          * vfsync is not necessarily synchronous, so it is best NOT to try
2554          * to flush the backing topology to media at this point.
2555          */
2556         hammer2_inode_ref(ip);
2557         if ((ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) ||
2558             !RB_EMPTY(&vp->v_rbdirty_tree)) {
2559                 if (info->pass == 1)
2560                         vfsync(vp, info->waitfor, 1, NULL, NULL);
2561                 else
2562                         bio_track_wait(&vp->v_track_write, 0, 0);
2563         }
2564         if (info->pass == 2 && (vp->v_flag & VISDIRTY)) {
2565                 /*
2566                  * v_token is needed to interlock v_rbdirty_tree.
2567                  */
2568                 lwkt_gettoken(&vp->v_token);
2569                 hammer2_inode_lock(ip, 0);
2570                 hammer2_inode_chain_sync(ip);
2571                 hammer2_inode_chain_flush(ip);
2572                 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2573                                   HAMMER2_INODE_RESIZED |
2574                                   HAMMER2_INODE_DIRTYDATA)) == 0 &&
2575                     RB_EMPTY(&vp->v_rbdirty_tree) &&
2576                     !bio_track_active(&vp->v_track_write)) {
2577                         vclrisdirty(vp);
2578                 }
2579                 hammer2_inode_unlock(ip);
2580                 lwkt_reltoken(&vp->v_token);
2581         }
2582         hammer2_inode_drop(ip);
2583 #if 1
2584         error = 0;
2585         if (error)
2586                 info->error = error;
2587 #endif
2588         return(0);
2589 }
2590
2591 static
2592 int
2593 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2594 {
2595         hammer2_inode_t *ip;
2596
2597         KKASSERT(MAXFIDSZ >= 16);
2598         ip = VTOI(vp);
2599         fhp->fid_len = offsetof(struct fid, fid_data[16]);
2600         fhp->fid_ext = 0;
2601         ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2602         ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2603
2604         return 0;
2605 }
2606
2607 static
2608 int
2609 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2610                struct fid *fhp, struct vnode **vpp)
2611 {
2612         hammer2_pfs_t *pmp;
2613         hammer2_tid_t inum;
2614         int error;
2615
2616         pmp = MPTOPMP(mp);
2617         inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2618         if (vpp) {
2619                 if (inum == 1)
2620                         error = hammer2_vfs_root(mp, vpp);
2621                 else
2622                         error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2623         } else {
2624                 error = 0;
2625         }
2626         if (error)
2627                 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2628         return error;
2629 }
2630
2631 static
2632 int
2633 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2634                  int *exflagsp, struct ucred **credanonp)
2635 {
2636         hammer2_pfs_t *pmp;
2637         struct netcred *np;
2638         int error;
2639
2640         pmp = MPTOPMP(mp);
2641         np = vfs_export_lookup(mp, &pmp->export, nam);
2642         if (np) {
2643                 *exflagsp = np->netc_exflags;
2644                 *credanonp = &np->netc_anon;
2645                 error = 0;
2646         } else {
2647                 error = EACCES;
2648         }
2649         return error;
2650 }
2651
2652 /*
2653  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2654  * header into the HMP
2655  *
2656  * XXX read four volhdrs and use the one with the highest TID whos CRC
2657  *     matches.
2658  *
2659  * XXX check iCRCs.
2660  *
2661  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2662  *     nonexistant locations.
2663  *
2664  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2665  */
2666 static
2667 int
2668 hammer2_install_volume_header(hammer2_dev_t *hmp)
2669 {
2670         hammer2_volume_data_t *vd;
2671         struct buf *bp;
2672         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2673         int error_reported;
2674         int error;
2675         int valid;
2676         int i;
2677
2678         error_reported = 0;
2679         error = 0;
2680         valid = 0;
2681         bp = NULL;
2682
2683         /*
2684          * There are up to 4 copies of the volume header (syncs iterate
2685          * between them so there is no single master).  We don't trust the
2686          * volu_size field so we don't know precisely how large the filesystem
2687          * is, so depend on the OS to return an error if we go beyond the
2688          * block device's EOF.
2689          */
2690         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2691                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2692                               HAMMER2_VOLUME_BYTES, &bp);
2693                 if (error) {
2694                         brelse(bp);
2695                         bp = NULL;
2696                         continue;
2697                 }
2698
2699                 vd = (struct hammer2_volume_data *) bp->b_data;
2700                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2701                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2702                         brelse(bp);
2703                         bp = NULL;
2704                         continue;
2705                 }
2706
2707                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2708                         /* XXX: Reversed-endianness filesystem */
2709                         kprintf("hammer2: reverse-endian filesystem detected");
2710                         brelse(bp);
2711                         bp = NULL;
2712                         continue;
2713                 }
2714
2715                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2716                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2717                                       HAMMER2_VOLUME_ICRC0_SIZE);
2718                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2719                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2720                                        HAMMER2_VOLUME_ICRC1_SIZE);
2721                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2722                         kprintf("hammer2 volume header crc "
2723                                 "mismatch copy #%d %08x/%08x\n",
2724                                 i, crc0, crc);
2725                         error_reported = 1;
2726                         brelse(bp);
2727                         bp = NULL;
2728                         continue;
2729                 }
2730                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2731                         valid = 1;
2732                         hmp->voldata = *vd;
2733                         hmp->volhdrno = i;
2734                 }
2735                 brelse(bp);
2736                 bp = NULL;
2737         }
2738         if (valid) {
2739                 hmp->volsync = hmp->voldata;
2740                 hmp->free_reserved = hmp->voldata.allocator_size / 20;
2741                 error = 0;
2742                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2743                         kprintf("hammer2: using volume header #%d\n",
2744                                 hmp->volhdrno);
2745                 }
2746         } else {
2747                 error = EINVAL;
2748                 kprintf("hammer2: no valid volume headers found!\n");
2749         }
2750         return (error);
2751 }
2752
2753 /*
2754  * This handles hysteresis on regular file flushes.  Because the BIOs are
2755  * routed to a thread it is possible for an excessive number to build up
2756  * and cause long front-end stalls long before the runningbuffspace limit
2757  * is hit, so we implement hammer2_flush_pipe to control the
2758  * hysteresis.
2759  *
2760  * This is a particular problem when compression is used.
2761  */
2762 void
2763 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2764 {
2765         atomic_add_int(&pmp->count_lwinprog, 1);
2766 }
2767
2768 void
2769 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2770 {
2771         int lwinprog;
2772
2773         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2774         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2775             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2776                 atomic_clear_int(&pmp->count_lwinprog,
2777                                  HAMMER2_LWINPROG_WAITING);
2778                 wakeup(&pmp->count_lwinprog);
2779         }
2780         if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2781             (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2782                 atomic_clear_int(&pmp->count_lwinprog,
2783                                  HAMMER2_LWINPROG_WAITING0);
2784                 wakeup(&pmp->count_lwinprog);
2785         }
2786 }
2787
2788 void
2789 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2790 {
2791         int lwinprog;
2792         int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2793                                     HAMMER2_LWINPROG_WAITING0;
2794
2795         for (;;) {
2796                 lwinprog = pmp->count_lwinprog;
2797                 cpu_ccfence();
2798                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2799                         break;
2800                 tsleep_interlock(&pmp->count_lwinprog, 0);
2801                 atomic_set_int(&pmp->count_lwinprog, lwflag);
2802                 lwinprog = pmp->count_lwinprog;
2803                 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2804                         break;
2805                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2806         }
2807 }
2808
2809 /*
2810  * Attempt to proactively fsync dirty vnodes if we have too many.  This
2811  * solves an issue where the kernel syncer thread can get seriously behind
2812  * when multiple user processes/threads are furiously modifying inodes.
2813  * This situation can occur on slow storage and is only limited by
2814  * kern.maxvnodes without the moderation code below.  It is made worse
2815  * when the device buffers underlying the modified inodes (which are clean)
2816  * get evicted before the flush can occur, forcing a re-read.
2817  *
2818  * We do not want sysads to feel that they have to torpedo kern.maxvnodes
2819  * to solve this problem, so we implement vfs.hammer2.limit_dirty_inodes
2820  * (per-mount-basis) and default it to something reasonable.
2821  */
2822 static void
2823 hammer2_pfs_moderate(hammer2_inode_t *ip, int always_moderate)
2824 {
2825         hammer2_pfs_t *pmp = ip->pmp;
2826         struct mount *mp = pmp->mp;
2827
2828         if (mp && vn_syncer_count(mp) > hammer2_limit_dirty_inodes) {
2829                 vn_syncer_one(mp);
2830         }
2831 }
2832
2833 /*
2834  * Manage excessive memory resource use for chain and related
2835  * structures.
2836  *
2837  * Called without any inode locks or transaction locks.  VNodes
2838  * might be locked by the kernel in the call stack.
2839  */
2840 void
2841 hammer2_pfs_memory_wait(hammer2_inode_t *ip, int always_moderate)
2842 {
2843         hammer2_pfs_t *pmp = ip->pmp;
2844         uint32_t waiting;
2845         uint32_t count;
2846         uint32_t limit;
2847 #if 0
2848         static int zzticks;
2849 #endif
2850
2851         /*
2852          * Moderate the number of dirty inodes
2853          */
2854         hammer2_pfs_moderate(ip, always_moderate);
2855
2856         /*
2857          * Atomic check condition and wait.  Also do an early speedup of
2858          * the syncer to try to avoid hitting the wait.
2859          */
2860         for (;;) {
2861                 waiting = pmp->inmem_dirty_chains;
2862                 cpu_ccfence();
2863                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2864
2865                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2866                 if (limit < hammer2_limit_dirty_chains)
2867                         limit = hammer2_limit_dirty_chains;
2868                 if (limit < 1000)
2869                         limit = 1000;
2870
2871 #if 0
2872                 if ((int)(ticks - zzticks) > hz) {
2873                         zzticks = ticks;
2874                         kprintf("count %ld %ld\n", count, limit);
2875                 }
2876 #endif
2877
2878                 /*
2879                  * Block if there are too many dirty chains present, wait
2880                  * for the flush to clean some out.
2881                  */
2882                 if (count > limit) {
2883                         hammer2_pfs_moderate(ip, always_moderate);
2884                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2885                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2886                                                waiting,
2887                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2888                                 if (ticks != pmp->speedup_ticks) {
2889                                         pmp->speedup_ticks = ticks;
2890                                         speedup_syncer(pmp->mp);
2891                                 }
2892                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2893                                        "chnmem", hz);
2894                         }
2895                         continue;       /* loop on success or fail */
2896                 }
2897
2898                 /*
2899                  * Try to start an early flush before we are forced to block.
2900                  */
2901                 if (count > limit * 5 / 10 &&
2902                     ticks != pmp->speedup_ticks) {
2903                         pmp->speedup_ticks = ticks;
2904                         speedup_syncer(pmp->mp);
2905                 }
2906                 break;
2907         }
2908 }
2909
2910 void
2911 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2912 {
2913         if (pmp) {
2914                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2915         }
2916 }
2917
2918 void
2919 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2920 {
2921         uint32_t waiting;
2922
2923         if (pmp) {
2924                 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1);
2925                 /* don't need --waiting to test flag */
2926                 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) {
2927                         atomic_clear_int(&pmp->inmem_dirty_chains,
2928                                          HAMMER2_DIRTYCHAIN_WAITING);
2929                         wakeup(&pmp->inmem_dirty_chains);
2930                 }
2931         }
2932 }
2933
2934 /*
2935  * Returns 0 if the filesystem has tons of free space
2936  * Returns 1 if the filesystem has less than 10% remaining
2937  * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
2938  */
2939 int
2940 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
2941 {
2942         hammer2_pfs_t *pmp;
2943         hammer2_dev_t *hmp;
2944         hammer2_off_t free_reserved;
2945         hammer2_off_t free_nominal;
2946         int i;
2947
2948         pmp = ip->pmp;
2949
2950         if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
2951                 free_reserved = HAMMER2_SEGSIZE;
2952                 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
2953                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2954                         hmp = pmp->pfs_hmps[i];
2955                         if (hmp == NULL)
2956                                 continue;
2957                         if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
2958                             pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
2959                                 continue;
2960
2961                         if (free_nominal > hmp->voldata.allocator_free)
2962                                 free_nominal = hmp->voldata.allocator_free;
2963                         if (free_reserved < hmp->free_reserved)
2964                                 free_reserved = hmp->free_reserved;
2965                 }
2966
2967                 /*
2968                  * SMP races ok
2969                  */
2970                 pmp->free_reserved = free_reserved;
2971                 pmp->free_nominal = free_nominal;
2972                 pmp->free_ticks = ticks;
2973         } else {
2974                 free_reserved = pmp->free_reserved;
2975                 free_nominal = pmp->free_nominal;
2976         }
2977         if (cred && cred->cr_uid != 0) {
2978                 if ((int64_t)(free_nominal - bytes) <
2979                     (int64_t)free_reserved) {
2980                         return 2;
2981                 }
2982         } else {
2983                 if ((int64_t)(free_nominal - bytes) <
2984                     (int64_t)free_reserved / 2) {
2985                         return 2;
2986                 }
2987         }
2988         if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
2989                 return 1;
2990         return 0;
2991 }
2992
2993 /*
2994  * Debugging
2995  */
2996 void
2997 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx,
2998                    u_int flags)
2999 {
3000         hammer2_chain_t *scan;
3001         hammer2_chain_t *parent;
3002
3003         --*countp;
3004         if (*countp == 0) {
3005                 kprintf("%*.*s...\n", tab, tab, "");
3006                 return;
3007         }
3008         if (*countp < 0)
3009                 return;
3010         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
3011                 tab, tab, "", pfx,
3012                 chain, chain->bref.type,
3013                 chain->bref.key, chain->bref.keybits,
3014                 chain->bref.mirror_tid);
3015
3016         kprintf("%*.*s      [%08x] (%s) refs=%d",
3017                 tab, tab, "",
3018                 chain->flags,
3019                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
3020                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
3021                 chain->refs);
3022
3023         parent = chain->parent;
3024         if (parent)
3025                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
3026                         tab, tab, "",
3027                         parent, parent->flags, parent->refs);
3028         if (RB_EMPTY(&chain->core.rbtree)) {
3029                 kprintf("\n");
3030         } else {
3031                 kprintf(" {\n");
3032                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) {
3033                         if ((scan->flags & flags) || flags == (u_int)-1) {
3034                                 hammer2_dump_chain(scan, tab + 4, countp, 'a',
3035                                                    flags);
3036                         }
3037                 }
3038                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
3039                         kprintf("%*.*s}(%s)\n", tab, tab, "",
3040                                 chain->data->ipdata.filename);
3041                 else
3042                         kprintf("%*.*s}\n", tab, tab, "");
3043         }
3044 }