sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 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  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42 #include <sys/malloc.h>
  43 #include <sys/nlookup.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/buf.h>
  47 #include <sys/buf2.h>
  48 #include "hammer.h"
  49
  50 /*
  51  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  52  *        in conditionals.
  53  */
  54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  55 int hammer_debug_io;
  56 int hammer_debug_general;
  57 int hammer_debug_debug = 1;             /* medium-error panics */
  58 int hammer_debug_inode;
  59 int hammer_debug_locks;
  60 int hammer_debug_btree;
  61 int hammer_debug_tid;
  62 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  63 int hammer_debug_recover_faults;
  64 int hammer_debug_critical;              /* non-zero enter debugger on error */
  65 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  66 int hammer_count_fsyncs;
  67 int hammer_count_inodes;
  68 int hammer_count_iqueued;
  69 int hammer_count_reclaiming;
  70 int hammer_count_records;
  71 int hammer_count_record_datas;
  72 int hammer_count_volumes;
  73 int hammer_count_buffers;
  74 int hammer_count_nodes;
  75 int64_t hammer_count_extra_space_used;
  76 int64_t hammer_stats_btree_lookups;
  77 int64_t hammer_stats_btree_searches;
  78 int64_t hammer_stats_btree_inserts;
  79 int64_t hammer_stats_btree_deletes;
  80 int64_t hammer_stats_btree_elements;
  81 int64_t hammer_stats_btree_splits;
  82 int64_t hammer_stats_btree_iterations;
  83 int64_t hammer_stats_btree_root_iterations;
  84 int64_t hammer_stats_record_iterations;
  85
  86 int64_t hammer_stats_file_read;
  87 int64_t hammer_stats_file_write;
  88 int64_t hammer_stats_file_iopsr;
  89 int64_t hammer_stats_file_iopsw;
  90 int64_t hammer_stats_disk_read;
  91 int64_t hammer_stats_disk_write;
  92 int64_t hammer_stats_inode_flushes;
  93 int64_t hammer_stats_commits;
  94 int64_t hammer_stats_undo;
  95
  96 int hammer_count_dirtybufspace;         /* global */
  97 int hammer_count_refedbufs;             /* global */
  98 int hammer_count_reservations;
  99 int hammer_count_io_running_read;
 100 int hammer_count_io_running_write;
 101 int hammer_count_io_locked;
 102 int hammer_limit_dirtybufspace;         /* per-mount */
 103 int hammer_limit_recs;                  /* as a whole XXX */
 104 int hammer_limit_inode_recs = 1024;     /* per inode */
 105 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
 106 int hammer_autoflush = 2000;            /* auto flush */
 107 int hammer_bio_count;
 108 int hammer_verify_zone;
 109 int hammer_verify_data = 1;
 110 int hammer_write_mode;
 111 int hammer_yield_check = 16;
 112 int hammer_fsync_mode;
 113 int64_t hammer_contention_count;
 114 int64_t hammer_zone_limit;
 115
 116 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 118            &hammer_supported_version, 0, "");
 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 120            &hammer_debug_general, 0, "");
 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 122            &hammer_debug_io, 0, "");
 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 124            &hammer_debug_debug, 0, "");
 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 126            &hammer_debug_inode, 0, "");
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 128            &hammer_debug_locks, 0, "");
 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 130            &hammer_debug_btree, 0, "");
 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 132            &hammer_debug_tid, 0, "");
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 134            &hammer_debug_recover, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 136            &hammer_debug_recover_faults, 0, "");
 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 138            &hammer_debug_critical, 0, "");
 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 140            &hammer_cluster_enable, 0, "");
 141
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 143            &hammer_limit_dirtybufspace, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 145            &hammer_limit_recs, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 147            &hammer_limit_inode_recs, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 149            &hammer_limit_reclaim, 0, "");
 150
 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 152            &hammer_count_fsyncs, 0, "");
 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 154            &hammer_count_inodes, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 156            &hammer_count_iqueued, 0, "");
 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 158            &hammer_count_reclaiming, 0, "");
 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 160            &hammer_count_records, 0, "");
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 162            &hammer_count_record_datas, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 164            &hammer_count_volumes, 0, "");
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 166            &hammer_count_buffers, 0, "");
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 168            &hammer_count_nodes, 0, "");
 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 170            &hammer_count_extra_space_used, 0, "");
 171
 172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 173            &hammer_stats_btree_searches, 0, "");
 174 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 175            &hammer_stats_btree_lookups, 0, "");
 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 177            &hammer_stats_btree_inserts, 0, "");
 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 179            &hammer_stats_btree_deletes, 0, "");
 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 181            &hammer_stats_btree_elements, 0, "");
 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 183            &hammer_stats_btree_splits, 0, "");
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 185            &hammer_stats_btree_iterations, 0, "");
 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 187            &hammer_stats_btree_root_iterations, 0, "");
 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 189            &hammer_stats_record_iterations, 0, "");
 190
 191 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 192            &hammer_stats_file_read, 0, "");
 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 194            &hammer_stats_file_write, 0, "");
 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 196            &hammer_stats_file_iopsr, 0, "");
 197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 198            &hammer_stats_file_iopsw, 0, "");
 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 200            &hammer_stats_disk_read, 0, "");
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 202            &hammer_stats_disk_write, 0, "");
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 204            &hammer_stats_inode_flushes, 0, "");
 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 206            &hammer_stats_commits, 0, "");
 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 208            &hammer_stats_undo, 0, "");
 209
 210 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 211            &hammer_count_dirtybufspace, 0, "");
 212 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 213            &hammer_count_refedbufs, 0, "");
 214 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 215            &hammer_count_reservations, 0, "");
 216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 217            &hammer_count_io_running_read, 0, "");
 218 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 219            &hammer_count_io_locked, 0, "");
 220 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 221            &hammer_count_io_running_write, 0, "");
 222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 223            &hammer_zone_limit, 0, "");
 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 225            &hammer_contention_count, 0, "");
 226 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 227            &hammer_autoflush, 0, "");
 228 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 229            &hammer_verify_zone, 0, "");
 230 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 231            &hammer_verify_data, 0, "");
 232 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 233            &hammer_write_mode, 0, "");
 234 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 235            &hammer_yield_check, 0, "");
 236 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 237            &hammer_fsync_mode, 0, "");
 238
 239 KTR_INFO_MASTER(hammer);
 240
 241 /*
 242  * VFS ABI
 243  */
 244 static void     hammer_free_hmp(struct mount *mp);
 245
 246 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 247                                 struct ucred *cred);
 248 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 249 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 250 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 251                                 struct ucred *cred);
 252 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 253                                 struct ucred *cred);
 254 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 255 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 256                                 ino_t ino, struct vnode **vpp);
 257 static int      hammer_vfs_init(struct vfsconf *conf);
 258 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 259                                 struct fid *fhp, struct vnode **vpp);
 260 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 261 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 262                                 int *exflagsp, struct ucred **credanonp);
 263
 264
 265 static struct vfsops hammer_vfsops = {
 266         .vfs_mount      = hammer_vfs_mount,
 267         .vfs_unmount    = hammer_vfs_unmount,
 268         .vfs_root       = hammer_vfs_root,
 269         .vfs_statfs     = hammer_vfs_statfs,
 270         .vfs_statvfs    = hammer_vfs_statvfs,
 271         .vfs_sync       = hammer_vfs_sync,
 272         .vfs_vget       = hammer_vfs_vget,
 273         .vfs_init       = hammer_vfs_init,
 274         .vfs_vptofh     = hammer_vfs_vptofh,
 275         .vfs_fhtovp     = hammer_vfs_fhtovp,
 276         .vfs_checkexp   = hammer_vfs_checkexp
 277 };
 278
 279 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 280
 281 VFS_SET(hammer_vfsops, hammer, 0);
 282 MODULE_VERSION(hammer, 1);
 283
 284 static int
 285 hammer_vfs_init(struct vfsconf *conf)
 286 {
 287         int n;
 288
 289         if (hammer_limit_recs == 0) {
 290                 hammer_limit_recs = nbuf * 25;
 291                 n = kmalloc_limit(M_HAMMER) / 512;
 292                 if (hammer_limit_recs > n)
 293                         hammer_limit_recs = n;
 294         }
 295         if (hammer_limit_dirtybufspace == 0) {
 296                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 297                 if (hammer_limit_dirtybufspace < 100)
 298                         hammer_limit_dirtybufspace = 100;
 299         }
 300         return(0);
 301 }
 302
 303 static int
 304 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 305                  struct ucred *cred)
 306 {
 307         struct hammer_mount_info info;
 308         hammer_mount_t hmp;
 309         hammer_volume_t rootvol;
 310         struct vnode *rootvp;
 311         struct vnode *devvp = NULL;
 312         const char *upath;      /* volume name in userspace */
 313         char *path;             /* volume name in system space */
 314         int error;
 315         int i;
 316         int master_id;
 317         int maxinodes;
 318         char *next_volume_ptr = NULL;
 319
 320         /*
 321          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 322          */
 323         if (mntpt == NULL) {
 324                 bzero(&info, sizeof(info));
 325                 info.asof = 0;
 326                 info.hflags = 0;
 327                 info.nvolumes = 1;
 328
 329                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 330
 331                 /* Count number of volumes separated by ':' */
 332                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 333                         if (*p == ':') {
 334                                 ++info.nvolumes;
 335                         }
 336                 }
 337
 338                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 339         } else {
 340                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 341                         return (error);
 342         }
 343
 344         /*
 345          * updating or new mount
 346          */
 347         if (mp->mnt_flag & MNT_UPDATE) {
 348                 hmp = (void *)mp->mnt_data;
 349                 KKASSERT(hmp != NULL);
 350         } else {
 351                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 352                         return (EINVAL);
 353                 hmp = NULL;
 354         }
 355
 356         /*
 357          * master-id validation.  The master id may not be changed by a
 358          * mount update.
 359          */
 360         if (info.hflags & HMNT_MASTERID) {
 361                 if (hmp && hmp->master_id != info.master_id) {
 362                         kprintf("hammer: cannot change master id "
 363                                 "with mount update\n");
 364                         return(EINVAL);
 365                 }
 366                 master_id = info.master_id;
 367                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 368                         return (EINVAL);
 369         } else {
 370                 if (hmp)
 371                         master_id = hmp->master_id;
 372                 else
 373                         master_id = 0;
 374         }
 375
 376         /*
 377          * Interal mount data structure
 378          */
 379         if (hmp == NULL) {
 380                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 381                 mp->mnt_data = (qaddr_t)hmp;
 382                 hmp->mp = mp;
 383                 /*TAILQ_INIT(&hmp->recycle_list);*/
 384
 385                 /*
 386                  * Make sure kmalloc type limits are set appropriately.  If root
 387                  * increases the vnode limit you may have to do a dummy remount
 388                  * to adjust the HAMMER inode limit.
 389                  */
 390                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 391                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 392
 393                 maxinodes = desiredvnodes + desiredvnodes / 5 +
 394                             hammer_limit_reclaim * 2;
 395                 kmalloc_raise_limit(hmp->m_inodes,
 396                                     maxinodes * sizeof(struct hammer_inode));
 397
 398                 hmp->root_btree_beg.localization = 0x00000000U;
 399                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 400                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 401                 hmp->root_btree_beg.create_tid = 1;
 402                 hmp->root_btree_beg.delete_tid = 1;
 403                 hmp->root_btree_beg.rec_type = 0;
 404                 hmp->root_btree_beg.obj_type = 0;
 405
 406                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 407                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 408                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 409                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 410                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 411                 hmp->root_btree_end.rec_type = 0xFFFFU;
 412                 hmp->root_btree_end.obj_type = 0;
 413
 414                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 415                 hmp->krate.count = -16; /* initial burst */
 416
 417                 hmp->sync_lock.refs = 1;
 418                 hmp->free_lock.refs = 1;
 419                 hmp->undo_lock.refs = 1;
 420                 hmp->blkmap_lock.refs = 1;
 421                 hmp->snapshot_lock.refs = 1;
 422                 hmp->volume_lock.refs = 1;
 423
 424                 TAILQ_INIT(&hmp->delay_list);
 425                 TAILQ_INIT(&hmp->flush_group_list);
 426                 TAILQ_INIT(&hmp->objid_cache_list);
 427                 TAILQ_INIT(&hmp->undo_lru_list);
 428                 TAILQ_INIT(&hmp->reclaim_list);
 429         }
 430         hmp->hflags &= ~HMNT_USERFLAGS;
 431         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 432
 433         hmp->master_id = master_id;
 434
 435         if (info.asof) {
 436                 mp->mnt_flag |= MNT_RDONLY;
 437                 hmp->asof = info.asof;
 438         } else {
 439                 hmp->asof = HAMMER_MAX_TID;
 440         }
 441
 442         hmp->volume_to_remove = -1;
 443
 444         /*
 445          * Re-open read-write if originally read-only, or vise-versa.
 446          *
 447          * When going from read-only to read-write execute the stage2
 448          * recovery if it has not already been run.
 449          */
 450         if (mp->mnt_flag & MNT_UPDATE) {
 451                 error = 0;
 452                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 453                         kprintf("HAMMER read-only -> read-write\n");
 454                         hmp->ronly = 0;
 455                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 456                                 hammer_adjust_volume_mode, NULL);
 457                         rootvol = hammer_get_root_volume(hmp, &error);
 458                         if (rootvol) {
 459                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 460                                 error = hammer_recover_stage2(hmp, rootvol);
 461                                 bcopy(rootvol->ondisk->vol0_blockmap,
 462                                       hmp->blockmap,
 463                                       sizeof(hmp->blockmap));
 464                                 hammer_rel_volume(rootvol, 0);
 465                         }
 466                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 467                                 hammer_reload_inode, NULL);
 468                         /* kernel clears MNT_RDONLY */
 469                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 470                         kprintf("HAMMER read-write -> read-only\n");
 471                         hmp->ronly = 1; /* messy */
 472                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 473                                 hammer_reload_inode, NULL);
 474                         hmp->ronly = 0;
 475                         hammer_flusher_sync(hmp);
 476                         hammer_flusher_sync(hmp);
 477                         hammer_flusher_sync(hmp);
 478                         hmp->ronly = 1;
 479                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 480                                 hammer_adjust_volume_mode, NULL);
 481                 }
 482                 return(error);
 483         }
 484
 485         RB_INIT(&hmp->rb_vols_root);
 486         RB_INIT(&hmp->rb_inos_root);
 487         RB_INIT(&hmp->rb_nods_root);
 488         RB_INIT(&hmp->rb_undo_root);
 489         RB_INIT(&hmp->rb_resv_root);
 490         RB_INIT(&hmp->rb_bufs_root);
 491         RB_INIT(&hmp->rb_pfsm_root);
 492
 493         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 494
 495         TAILQ_INIT(&hmp->volu_list);
 496         TAILQ_INIT(&hmp->undo_list);
 497         TAILQ_INIT(&hmp->data_list);
 498         TAILQ_INIT(&hmp->meta_list);
 499         TAILQ_INIT(&hmp->lose_list);
 500
 501         /*
 502          * Load volumes
 503          */
 504         path = objcache_get(namei_oc, M_WAITOK);
 505         hmp->nvolumes = -1;
 506         for (i = 0; i < info.nvolumes; ++i) {
 507                 if (mntpt == NULL) {
 508                         /*
 509                          * Root mount.
 510                          */
 511                         KKASSERT(next_volume_ptr != NULL);
 512                         strcpy(path, "");
 513                         if (*next_volume_ptr != '/') {
 514                                 /* relative path */
 515                                 strcpy(path, "/dev/");
 516                         }
 517                         int k;
 518                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 519                                 if (*next_volume_ptr == '\0') {
 520                                         break;
 521                                 } else if (*next_volume_ptr == ':') {
 522                                         ++next_volume_ptr;
 523                                         break;
 524                                 } else {
 525                                         path[k] = *next_volume_ptr;
 526                                         ++next_volume_ptr;
 527                                 }
 528                         }
 529                         path[k] = '\0';
 530
 531                         error = 0;
 532                         cdev_t dev = kgetdiskbyname(path);
 533                         error = bdevvp(dev, &devvp);
 534                         if (error) {
 535                                 kprintf("hammer_mountroot: can't find devvp\n");
 536                         }
 537                 } else {
 538                         error = copyin(&info.volumes[i], &upath,
 539                                        sizeof(char *));
 540                         if (error == 0)
 541                                 error = copyinstr(upath, path,
 542                                                   MAXPATHLEN, NULL);
 543                 }
 544                 if (error == 0)
 545                         error = hammer_install_volume(hmp, path, devvp);
 546                 if (error)
 547                         break;
 548         }
 549         objcache_put(namei_oc, path);
 550
 551         /*
 552          * Make sure we found a root volume
 553          */
 554         if (error == 0 && hmp->rootvol == NULL) {
 555                 kprintf("hammer_mount: No root volume found!\n");
 556                 error = EINVAL;
 557         }
 558
 559         /*
 560          * Check that all required volumes are available
 561          */
 562         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 563                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 564                 error = EINVAL;
 565         }
 566
 567         if (error) {
 568                 hammer_free_hmp(mp);
 569                 return (error);
 570         }
 571
 572         /*
 573          * No errors, setup enough of the mount point so we can lookup the
 574          * root vnode.
 575          */
 576         mp->mnt_iosize_max = MAXPHYS;
 577         mp->mnt_kern_flag |= MNTK_FSMID;
 578
 579         /*
 580          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 581          * will acquire a per-mount token prior to entry and release it
 582          * on return, so even if we do not specify it we no longer get
 583          * the BGL regardlless of how we are flagged.
 584          */
 585         mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE;
 586
 587         /*
 588          * note: f_iosize is used by vnode_pager_haspage() when constructing
 589          * its VOP_BMAP call.
 590          */
 591         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 592         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 593
 594         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 595         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 596
 597         mp->mnt_maxsymlinklen = 255;
 598         mp->mnt_flag |= MNT_LOCAL;
 599
 600         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 601         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 602         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 603
 604         /*
 605          * The root volume's ondisk pointer is only valid if we hold a
 606          * reference to it.
 607          */
 608         rootvol = hammer_get_root_volume(hmp, &error);
 609         if (error)
 610                 goto failed;
 611
 612         /*
 613          * Perform any necessary UNDO operations.  The recovery code does
 614          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 615          * and then re-copy it again after recovery is complete.
 616          *
 617          * If this is a read-only mount the UNDO information is retained
 618          * in memory in the form of dirty buffer cache buffers, and not
 619          * written back to the media.
 620          */
 621         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 622               sizeof(hmp->blockmap));
 623
 624         /*
 625          * Check filesystem version
 626          */
 627         hmp->version = rootvol->ondisk->vol_version;
 628         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 629             hmp->version > HAMMER_VOL_VERSION_MAX) {
 630                 kprintf("HAMMER: mount unsupported fs version %d\n",
 631                         hmp->version);
 632                 error = ERANGE;
 633                 goto done;
 634         }
 635
 636         /*
 637          * The undo_rec_limit limits the size of flush groups to avoid
 638          * blowing out the UNDO FIFO.  This calculation is typically in
 639          * the tens of thousands and is designed primarily when small
 640          * HAMMER filesystems are created.
 641          */
 642         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 643         if (hammer_debug_general & 0x0001)
 644                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 645
 646         /*
 647          * NOTE: Recover stage1 not only handles meta-data recovery, it
 648          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 649          */
 650         error = hammer_recover_stage1(hmp, rootvol);
 651         if (error) {
 652                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 653                 goto done;
 654         }
 655
 656         /*
 657          * Finish setup now that we have a good root volume.
 658          *
 659          * The top 16 bits of fsid.val[1] is a pfs id.
 660          */
 661         ksnprintf(mp->mnt_stat.f_mntfromname,
 662                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 663                   rootvol->ondisk->vol_name);
 664         mp->mnt_stat.f_fsid.val[0] =
 665                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 666         mp->mnt_stat.f_fsid.val[1] =
 667                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 668         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 669
 670         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 671         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 672                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 673
 674         /*
 675          * Certain often-modified fields in the root volume are cached in
 676          * the hammer_mount structure so we do not have to generate lots
 677          * of little UNDO structures for them.
 678          *
 679          * Recopy after recovery.  This also has the side effect of
 680          * setting our cached undo FIFO's first_offset, which serves to
 681          * placemark the FIFO start for the NEXT flush cycle while the
 682          * on-disk first_offset represents the LAST flush cycle.
 683          */
 684         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 685         hmp->flush_tid1 = hmp->next_tid;
 686         hmp->flush_tid2 = hmp->next_tid;
 687         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 688               sizeof(hmp->blockmap));
 689         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 690
 691         hammer_flusher_create(hmp);
 692
 693         /*
 694          * Locate the root directory using the root cluster's B-Tree as a
 695          * starting point.  The root directory uses an obj_id of 1.
 696          *
 697          * FUTURE: Leave the root directory cached referenced but unlocked
 698          * in hmp->rootvp (need to flush it on unmount).
 699          */
 700         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 701         if (error)
 702                 goto done;
 703         vput(rootvp);
 704         /*vn_unlock(hmp->rootvp);*/
 705         if (hmp->ronly == 0)
 706                 error = hammer_recover_stage2(hmp, rootvol);
 707
 708 done:
 709         hammer_rel_volume(rootvol, 0);
 710 failed:
 711         /*
 712          * Cleanup and return.
 713          */
 714         if (error)
 715                 hammer_free_hmp(mp);
 716         return (error);
 717 }
 718
 719 static int
 720 hammer_vfs_unmount(struct mount *mp, int mntflags)
 721 {
 722 #if 0
 723         struct hammer_mount *hmp = (void *)mp->mnt_data;
 724 #endif
 725         int flags;
 726         int error;
 727
 728         /*
 729          * Clean out the vnodes
 730          */
 731         flags = 0;
 732         if (mntflags & MNT_FORCE)
 733                 flags |= FORCECLOSE;
 734         if ((error = vflush(mp, 0, flags)) != 0)
 735                 return (error);
 736
 737         /*
 738          * Clean up the internal mount structure and related entities.  This
 739          * may issue I/O.
 740          */
 741         hammer_free_hmp(mp);
 742         return(0);
 743 }
 744
 745 /*
 746  * Clean up the internal mount structure and disassociate it from the mount.
 747  * This may issue I/O.
 748  */
 749 static void
 750 hammer_free_hmp(struct mount *mp)
 751 {
 752         struct hammer_mount *hmp = (void *)mp->mnt_data;
 753         hammer_flush_group_t flg;
 754         int count;
 755         int dummy;
 756
 757         /*
 758          * Flush anything dirty.  This won't even run if the
 759          * filesystem errored-out.
 760          */
 761         count = 0;
 762         while (hammer_flusher_haswork(hmp)) {
 763                 hammer_flusher_sync(hmp);
 764                 ++count;
 765                 if (count >= 5) {
 766                         if (count == 5)
 767                                 kprintf("HAMMER: umount flushing.");
 768                         else
 769                                 kprintf(".");
 770                         tsleep(&dummy, 0, "hmrufl", hz);
 771                 }
 772                 if (count == 30) {
 773                         kprintf("giving up\n");
 774                         break;
 775                 }
 776         }
 777         if (count >= 5 && count < 30)
 778                 kprintf("\n");
 779
 780         /*
 781          * If the mount had a critical error we have to destroy any
 782          * remaining inodes before we can finish cleaning up the flusher.
 783          */
 784         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 785                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 786                         hammer_destroy_inode_callback, NULL);
 787         }
 788
 789         /*
 790          * There shouldn't be any inodes left now and any left over
 791          * flush groups should now be empty.
 792          */
 793         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 794         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 795                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 796                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 797                 if (flg->refs) {
 798                         kprintf("HAMMER: Warning, flush_group %p was "
 799                                 "not empty on umount!\n", flg);
 800                 }
 801                 kfree(flg, hmp->m_misc);
 802         }
 803
 804         /*
 805          * We can finally destroy the flusher
 806          */
 807         hammer_flusher_destroy(hmp);
 808
 809         /*
 810          * We may have held recovered buffers due to a read-only mount.
 811          * These must be discarded.
 812          */
 813         if (hmp->ronly)
 814                 hammer_recover_flush_buffers(hmp, NULL, -1);
 815
 816         /*
 817          * Unload buffers and then volumes
 818          */
 819         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 820                 hammer_unload_buffer, NULL);
 821         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 822                 hammer_unload_volume, NULL);
 823
 824         mp->mnt_data = NULL;
 825         mp->mnt_flag &= ~MNT_LOCAL;
 826         hmp->mp = NULL;
 827         hammer_destroy_objid_cache(hmp);
 828         kmalloc_destroy(&hmp->m_misc);
 829         kmalloc_destroy(&hmp->m_inodes);
 830         kfree(hmp, M_HAMMER);
 831 }
 832
 833 /*
 834  * Report critical errors.  ip may be NULL.
 835  */
 836 void
 837 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 838                       int error, const char *msg)
 839 {
 840         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 841
 842         krateprintf(&hmp->krate,
 843                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 844                     hmp->mp->mnt_stat.f_mntfromname,
 845                     (intmax_t)(ip ? ip->obj_id : -1),
 846                     error, msg);
 847
 848         if (hmp->ronly == 0) {
 849                 hmp->ronly = 2;         /* special errored read-only mode */
 850                 hmp->mp->mnt_flag |= MNT_RDONLY;
 851                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 852                         hmp->mp->mnt_stat.f_mntfromname);
 853         }
 854         hmp->error = error;
 855         if (hammer_debug_critical)
 856                 Debugger("Entering debugger");
 857 }
 858
 859
 860 /*
 861  * Obtain a vnode for the specified inode number.  An exclusively locked
 862  * vnode is returned.
 863  */
 864 int
 865 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 866                 ino_t ino, struct vnode **vpp)
 867 {
 868         struct hammer_transaction trans;
 869         struct hammer_mount *hmp = (void *)mp->mnt_data;
 870         struct hammer_inode *ip;
 871         int error;
 872         u_int32_t localization;
 873
 874         hammer_simple_transaction(&trans, hmp);
 875
 876         /*
 877          * If a directory vnode is supplied (mainly NFS) then we can acquire
 878          * the PFS domain from it.  Otherwise we would only be able to vget
 879          * inodes in the root PFS.
 880          */
 881         if (dvp) {
 882                 localization = HAMMER_DEF_LOCALIZATION +
 883                                 VTOI(dvp)->obj_localization;
 884         } else {
 885                 localization = HAMMER_DEF_LOCALIZATION;
 886         }
 887
 888         /*
 889          * Lookup the requested HAMMER inode.  The structure must be
 890          * left unlocked while we manipulate the related vnode to avoid
 891          * a deadlock.
 892          */
 893         ip = hammer_get_inode(&trans, NULL, ino,
 894                               hmp->asof, localization,
 895                               0, &error);
 896         if (ip == NULL) {
 897                 *vpp = NULL;
 898                 hammer_done_transaction(&trans);
 899                 return(error);
 900         }
 901         error = hammer_get_vnode(ip, vpp);
 902         hammer_rel_inode(ip, 0);
 903         hammer_done_transaction(&trans);
 904         return (error);
 905 }
 906
 907 /*
 908  * Return the root vnode for the filesystem.
 909  *
 910  * HAMMER stores the root vnode in the hammer_mount structure so
 911  * getting it is easy.
 912  */
 913 static int
 914 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 915 {
 916 #if 0
 917         struct hammer_mount *hmp = (void *)mp->mnt_data;
 918 #endif
 919         int error;
 920
 921         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 922         return (error);
 923 }
 924
 925 static int
 926 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 927 {
 928         struct hammer_mount *hmp = (void *)mp->mnt_data;
 929         hammer_volume_t volume;
 930         hammer_volume_ondisk_t ondisk;
 931         int error;
 932         int64_t bfree;
 933         int64_t breserved;
 934
 935         volume = hammer_get_root_volume(hmp, &error);
 936         if (error)
 937                 return(error);
 938         ondisk = volume->ondisk;
 939
 940         /*
 941          * Basic stats
 942          */
 943         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 944         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 945         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 946         hammer_rel_volume(volume, 0);
 947
 948         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 949         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 950         if (mp->mnt_stat.f_files < 0)
 951                 mp->mnt_stat.f_files = 0;
 952
 953         *sbp = mp->mnt_stat;
 954         return(0);
 955 }
 956
 957 static int
 958 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 959 {
 960         struct hammer_mount *hmp = (void *)mp->mnt_data;
 961         hammer_volume_t volume;
 962         hammer_volume_ondisk_t ondisk;
 963         int error;
 964         int64_t bfree;
 965         int64_t breserved;
 966
 967         volume = hammer_get_root_volume(hmp, &error);
 968         if (error)
 969                 return(error);
 970         ondisk = volume->ondisk;
 971
 972         /*
 973          * Basic stats
 974          */
 975         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 976         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 977         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 978         hammer_rel_volume(volume, 0);
 979
 980         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 981         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 982         if (mp->mnt_vstat.f_files < 0)
 983                 mp->mnt_vstat.f_files = 0;
 984         *sbp = mp->mnt_vstat;
 985         return(0);
 986 }
 987
 988 /*
 989  * Sync the filesystem.  Currently we have to run it twice, the second
 990  * one will advance the undo start index to the end index, so if a crash
 991  * occurs no undos will be run on mount.
 992  *
 993  * We do not sync the filesystem if we are called from a panic.  If we did
 994  * we might end up blowing up a sync that was already in progress.
 995  */
 996 static int
 997 hammer_vfs_sync(struct mount *mp, int waitfor)
 998 {
 999         struct hammer_mount *hmp = (void *)mp->mnt_data;
1000         int error;
1001
1002         if (panicstr == NULL) {
1003                 error = hammer_sync_hmp(hmp, waitfor);
1004         } else {
1005                 error = EIO;
1006         }
1007         return (error);
1008 }
1009
1010 /*
1011  * Convert a vnode to a file handle.
1012  */
1013 static int
1014 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1015 {
1016         hammer_inode_t ip;
1017
1018         KKASSERT(MAXFIDSZ >= 16);
1019         ip = VTOI(vp);
1020         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1021         fhp->fid_ext = ip->obj_localization >> 16;
1022         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1023         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1024         return(0);
1025 }
1026
1027
1028 /*
1029  * Convert a file handle back to a vnode.
1030  *
1031  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1032  * null mount.
1033  */
1034 static int
1035 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1036                   struct fid *fhp, struct vnode **vpp)
1037 {
1038         struct hammer_transaction trans;
1039         struct hammer_inode *ip;
1040         struct hammer_inode_info info;
1041         int error;
1042         u_int32_t localization;
1043
1044         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1045         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1046         if (rootvp)
1047                 localization = VTOI(rootvp)->obj_localization;
1048         else
1049                 localization = (u_int32_t)fhp->fid_ext << 16;
1050
1051         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1052
1053         /*
1054          * Get/allocate the hammer_inode structure.  The structure must be
1055          * unlocked while we manipulate the related vnode to avoid a
1056          * deadlock.
1057          */
1058         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1059                               info.obj_asof, localization, 0, &error);
1060         if (ip == NULL) {
1061                 *vpp = NULL;
1062                 return(error);
1063         }
1064         error = hammer_get_vnode(ip, vpp);
1065         hammer_rel_inode(ip, 0);
1066         hammer_done_transaction(&trans);
1067         return (error);
1068 }
1069
1070 static int
1071 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1072                     int *exflagsp, struct ucred **credanonp)
1073 {
1074         hammer_mount_t hmp = (void *)mp->mnt_data;
1075         struct netcred *np;
1076         int error;
1077
1078         np = vfs_export_lookup(mp, &hmp->export, nam);
1079         if (np) {
1080                 *exflagsp = np->netc_exflags;
1081                 *credanonp = &np->netc_anon;
1082                 error = 0;
1083         } else {
1084                 error = EACCES;
1085         }
1086         return (error);
1087
1088 }
1089
1090 int
1091 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1092 {
1093         hammer_mount_t hmp = (void *)mp->mnt_data;
1094         int error;
1095
1096         switch(op) {
1097         case MOUNTCTL_SET_EXPORT:
1098                 error = vfs_export(mp, &hmp->export, export);
1099                 break;
1100         default:
1101                 error = EOPNOTSUPP;
1102                 break;
1103         }
1104         return(error);
1105 }
1106