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 int64_t hammer_stats_redo;
  96
  97 int hammer_count_dirtybufspace;         /* global */
  98 int hammer_count_refedbufs;             /* global */
  99 int hammer_count_reservations;
 100 int hammer_count_io_running_read;
 101 int hammer_count_io_running_write;
 102 int hammer_count_io_locked;
 103 int hammer_limit_dirtybufspace;         /* per-mount */
 104 int hammer_limit_recs;                  /* as a whole XXX */
 105 int hammer_limit_inode_recs = 1024;     /* per inode */
 106 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
 107 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 108 int hammer_autoflush = 2000;            /* auto flush */
 109 int hammer_bio_count;
 110 int hammer_verify_zone;
 111 int hammer_verify_data = 1;
 112 int hammer_write_mode;
 113 int hammer_yield_check = 16;
 114 int hammer_fsync_mode = 3;
 115 int64_t hammer_contention_count;
 116 int64_t hammer_zone_limit;
 117
 118 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 120            &hammer_supported_version, 0, "");
 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 122            &hammer_debug_general, 0, "");
 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 124            &hammer_debug_io, 0, "");
 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 126            &hammer_debug_debug, 0, "");
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 128            &hammer_debug_inode, 0, "");
 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 130            &hammer_debug_locks, 0, "");
 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 132            &hammer_debug_btree, 0, "");
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 134            &hammer_debug_tid, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 136            &hammer_debug_recover, 0, "");
 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 138            &hammer_debug_recover_faults, 0, "");
 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 140            &hammer_debug_critical, 0, "");
 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 142            &hammer_cluster_enable, 0, "");
 143
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 145            &hammer_limit_dirtybufspace, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 147            &hammer_limit_recs, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 149            &hammer_limit_inode_recs, 0, "");
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 151            &hammer_limit_reclaim, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 153            &hammer_limit_redo, 0, "");
 154
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 156            &hammer_count_fsyncs, 0, "");
 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 158            &hammer_count_inodes, 0, "");
 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 160            &hammer_count_iqueued, 0, "");
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 162            &hammer_count_reclaiming, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 164            &hammer_count_records, 0, "");
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 166            &hammer_count_record_datas, 0, "");
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 168            &hammer_count_volumes, 0, "");
 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 170            &hammer_count_buffers, 0, "");
 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 172            &hammer_count_nodes, 0, "");
 173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 174            &hammer_count_extra_space_used, 0, "");
 175
 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 177            &hammer_stats_btree_searches, 0, "");
 178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 179            &hammer_stats_btree_lookups, 0, "");
 180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 181            &hammer_stats_btree_inserts, 0, "");
 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 183            &hammer_stats_btree_deletes, 0, "");
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 185            &hammer_stats_btree_elements, 0, "");
 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 187            &hammer_stats_btree_splits, 0, "");
 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 189            &hammer_stats_btree_iterations, 0, "");
 190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 191            &hammer_stats_btree_root_iterations, 0, "");
 192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 193            &hammer_stats_record_iterations, 0, "");
 194
 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 196            &hammer_stats_file_read, 0, "");
 197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 198            &hammer_stats_file_write, 0, "");
 199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 200            &hammer_stats_file_iopsr, 0, "");
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 202            &hammer_stats_file_iopsw, 0, "");
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 204            &hammer_stats_disk_read, 0, "");
 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 206            &hammer_stats_disk_write, 0, "");
 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 208            &hammer_stats_inode_flushes, 0, "");
 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 210            &hammer_stats_commits, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 212            &hammer_stats_undo, 0, "");
 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 214            &hammer_stats_redo, 0, "");
 215
 216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 217            &hammer_count_dirtybufspace, 0, "");
 218 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 219            &hammer_count_refedbufs, 0, "");
 220 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 221            &hammer_count_reservations, 0, "");
 222 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 223            &hammer_count_io_running_read, 0, "");
 224 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 225            &hammer_count_io_locked, 0, "");
 226 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 227            &hammer_count_io_running_write, 0, "");
 228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 229            &hammer_zone_limit, 0, "");
 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 231            &hammer_contention_count, 0, "");
 232 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 233            &hammer_autoflush, 0, "");
 234 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 235            &hammer_verify_zone, 0, "");
 236 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 237            &hammer_verify_data, 0, "");
 238 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 239            &hammer_write_mode, 0, "");
 240 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 241            &hammer_yield_check, 0, "");
 242 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 243            &hammer_fsync_mode, 0, "");
 244
 245 KTR_INFO_MASTER(hammer);
 246
 247 /*
 248  * VFS ABI
 249  */
 250 static void     hammer_free_hmp(struct mount *mp);
 251
 252 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 253                                 struct ucred *cred);
 254 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 255 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 256 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 257                                 struct ucred *cred);
 258 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 259                                 struct ucred *cred);
 260 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 261 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 262                                 ino_t ino, struct vnode **vpp);
 263 static int      hammer_vfs_init(struct vfsconf *conf);
 264 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 265                                 struct fid *fhp, struct vnode **vpp);
 266 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 267 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 268                                 int *exflagsp, struct ucred **credanonp);
 269
 270
 271 static struct vfsops hammer_vfsops = {
 272         .vfs_mount      = hammer_vfs_mount,
 273         .vfs_unmount    = hammer_vfs_unmount,
 274         .vfs_root       = hammer_vfs_root,
 275         .vfs_statfs     = hammer_vfs_statfs,
 276         .vfs_statvfs    = hammer_vfs_statvfs,
 277         .vfs_sync       = hammer_vfs_sync,
 278         .vfs_vget       = hammer_vfs_vget,
 279         .vfs_init       = hammer_vfs_init,
 280         .vfs_vptofh     = hammer_vfs_vptofh,
 281         .vfs_fhtovp     = hammer_vfs_fhtovp,
 282         .vfs_checkexp   = hammer_vfs_checkexp
 283 };
 284
 285 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 286
 287 VFS_SET(hammer_vfsops, hammer, 0);
 288 MODULE_VERSION(hammer, 1);
 289
 290 static int
 291 hammer_vfs_init(struct vfsconf *conf)
 292 {
 293         int n;
 294
 295         if (hammer_limit_recs == 0) {
 296                 hammer_limit_recs = nbuf * 25;
 297                 n = kmalloc_limit(M_HAMMER) / 512;
 298                 if (hammer_limit_recs > n)
 299                         hammer_limit_recs = n;
 300         }
 301         if (hammer_limit_dirtybufspace == 0) {
 302                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 303                 if (hammer_limit_dirtybufspace < 100)
 304                         hammer_limit_dirtybufspace = 100;
 305         }
 306         return(0);
 307 }
 308
 309 static int
 310 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 311                  struct ucred *cred)
 312 {
 313         struct hammer_mount_info info;
 314         hammer_mount_t hmp;
 315         hammer_volume_t rootvol;
 316         struct vnode *rootvp;
 317         struct vnode *devvp = NULL;
 318         const char *upath;      /* volume name in userspace */
 319         char *path;             /* volume name in system space */
 320         int error;
 321         int i;
 322         int master_id;
 323         char *next_volume_ptr = NULL;
 324
 325         /*
 326          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 327          */
 328         if (mntpt == NULL) {
 329                 bzero(&info, sizeof(info));
 330                 info.asof = 0;
 331                 info.hflags = 0;
 332                 info.nvolumes = 1;
 333
 334                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 335
 336                 /* Count number of volumes separated by ':' */
 337                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 338                         if (*p == ':') {
 339                                 ++info.nvolumes;
 340                         }
 341                 }
 342
 343                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 344         } else {
 345                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 346                         return (error);
 347         }
 348
 349         /*
 350          * updating or new mount
 351          */
 352         if (mp->mnt_flag & MNT_UPDATE) {
 353                 hmp = (void *)mp->mnt_data;
 354                 KKASSERT(hmp != NULL);
 355         } else {
 356                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 357                         return (EINVAL);
 358                 hmp = NULL;
 359         }
 360
 361         /*
 362          * master-id validation.  The master id may not be changed by a
 363          * mount update.
 364          */
 365         if (info.hflags & HMNT_MASTERID) {
 366                 if (hmp && hmp->master_id != info.master_id) {
 367                         kprintf("hammer: cannot change master id "
 368                                 "with mount update\n");
 369                         return(EINVAL);
 370                 }
 371                 master_id = info.master_id;
 372                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 373                         return (EINVAL);
 374         } else {
 375                 if (hmp)
 376                         master_id = hmp->master_id;
 377                 else
 378                         master_id = 0;
 379         }
 380
 381         /*
 382          * Interal mount data structure
 383          */
 384         if (hmp == NULL) {
 385                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 386                 mp->mnt_data = (qaddr_t)hmp;
 387                 hmp->mp = mp;
 388                 /*TAILQ_INIT(&hmp->recycle_list);*/
 389
 390                 /*
 391                  * Make sure kmalloc type limits are set appropriately.
 392                  *
 393                  * Our inode kmalloc group is sized based on maxvnodes
 394                  * (controlled by the system, not us).
 395                  */
 396                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 397                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 398
 399                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 400
 401                 hmp->root_btree_beg.localization = 0x00000000U;
 402                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 403                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 404                 hmp->root_btree_beg.create_tid = 1;
 405                 hmp->root_btree_beg.delete_tid = 1;
 406                 hmp->root_btree_beg.rec_type = 0;
 407                 hmp->root_btree_beg.obj_type = 0;
 408
 409                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 410                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 411                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 412                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 413                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 414                 hmp->root_btree_end.rec_type = 0xFFFFU;
 415                 hmp->root_btree_end.obj_type = 0;
 416
 417                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 418                 hmp->krate.count = -16; /* initial burst */
 419
 420                 hmp->sync_lock.refs = 1;
 421                 hmp->free_lock.refs = 1;
 422                 hmp->undo_lock.refs = 1;
 423                 hmp->blkmap_lock.refs = 1;
 424                 hmp->snapshot_lock.refs = 1;
 425                 hmp->volume_lock.refs = 1;
 426
 427                 TAILQ_INIT(&hmp->delay_list);
 428                 TAILQ_INIT(&hmp->flush_group_list);
 429                 TAILQ_INIT(&hmp->objid_cache_list);
 430                 TAILQ_INIT(&hmp->undo_lru_list);
 431                 TAILQ_INIT(&hmp->reclaim_list);
 432         }
 433         hmp->hflags &= ~HMNT_USERFLAGS;
 434         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 435
 436         hmp->master_id = master_id;
 437
 438         if (info.asof) {
 439                 mp->mnt_flag |= MNT_RDONLY;
 440                 hmp->asof = info.asof;
 441         } else {
 442                 hmp->asof = HAMMER_MAX_TID;
 443         }
 444
 445         hmp->volume_to_remove = -1;
 446
 447         /*
 448          * Re-open read-write if originally read-only, or vise-versa.
 449          *
 450          * When going from read-only to read-write execute the stage2
 451          * recovery if it has not already been run.
 452          */
 453         if (mp->mnt_flag & MNT_UPDATE) {
 454                 error = 0;
 455                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 456                         kprintf("HAMMER read-only -> read-write\n");
 457                         hmp->ronly = 0;
 458                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 459                                 hammer_adjust_volume_mode, NULL);
 460                         rootvol = hammer_get_root_volume(hmp, &error);
 461                         if (rootvol) {
 462                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 463                                 error = hammer_recover_stage2(hmp, rootvol);
 464                                 bcopy(rootvol->ondisk->vol0_blockmap,
 465                                       hmp->blockmap,
 466                                       sizeof(hmp->blockmap));
 467                                 hammer_rel_volume(rootvol, 0);
 468                         }
 469                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 470                                 hammer_reload_inode, NULL);
 471                         /* kernel clears MNT_RDONLY */
 472                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 473                         kprintf("HAMMER read-write -> read-only\n");
 474                         hmp->ronly = 1; /* messy */
 475                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 476                                 hammer_reload_inode, NULL);
 477                         hmp->ronly = 0;
 478                         hammer_flusher_sync(hmp);
 479                         hammer_flusher_sync(hmp);
 480                         hammer_flusher_sync(hmp);
 481                         hmp->ronly = 1;
 482                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 483                                 hammer_adjust_volume_mode, NULL);
 484                 }
 485                 return(error);
 486         }
 487
 488         RB_INIT(&hmp->rb_vols_root);
 489         RB_INIT(&hmp->rb_inos_root);
 490         RB_INIT(&hmp->rb_redo_root);
 491         RB_INIT(&hmp->rb_nods_root);
 492         RB_INIT(&hmp->rb_undo_root);
 493         RB_INIT(&hmp->rb_resv_root);
 494         RB_INIT(&hmp->rb_bufs_root);
 495         RB_INIT(&hmp->rb_pfsm_root);
 496
 497         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 498
 499         TAILQ_INIT(&hmp->volu_list);
 500         TAILQ_INIT(&hmp->undo_list);
 501         TAILQ_INIT(&hmp->data_list);
 502         TAILQ_INIT(&hmp->meta_list);
 503         TAILQ_INIT(&hmp->lose_list);
 504         TAILQ_INIT(&hmp->iorun_list);
 505
 506         /*
 507          * Load volumes
 508          */
 509         path = objcache_get(namei_oc, M_WAITOK);
 510         hmp->nvolumes = -1;
 511         for (i = 0; i < info.nvolumes; ++i) {
 512                 if (mntpt == NULL) {
 513                         /*
 514                          * Root mount.
 515                          */
 516                         KKASSERT(next_volume_ptr != NULL);
 517                         strcpy(path, "");
 518                         if (*next_volume_ptr != '/') {
 519                                 /* relative path */
 520                                 strcpy(path, "/dev/");
 521                         }
 522                         int k;
 523                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 524                                 if (*next_volume_ptr == '\0') {
 525                                         break;
 526                                 } else if (*next_volume_ptr == ':') {
 527                                         ++next_volume_ptr;
 528                                         break;
 529                                 } else {
 530                                         path[k] = *next_volume_ptr;
 531                                         ++next_volume_ptr;
 532                                 }
 533                         }
 534                         path[k] = '\0';
 535
 536                         error = 0;
 537                         cdev_t dev = kgetdiskbyname(path);
 538                         error = bdevvp(dev, &devvp);
 539                         if (error) {
 540                                 kprintf("hammer_mountroot: can't find devvp\n");
 541                         }
 542                 } else {
 543                         error = copyin(&info.volumes[i], &upath,
 544                                        sizeof(char *));
 545                         if (error == 0)
 546                                 error = copyinstr(upath, path,
 547                                                   MAXPATHLEN, NULL);
 548                 }
 549                 if (error == 0)
 550                         error = hammer_install_volume(hmp, path, devvp);
 551                 if (error)
 552                         break;
 553         }
 554         objcache_put(namei_oc, path);
 555
 556         /*
 557          * Make sure we found a root volume
 558          */
 559         if (error == 0 && hmp->rootvol == NULL) {
 560                 kprintf("hammer_mount: No root volume found!\n");
 561                 error = EINVAL;
 562         }
 563
 564         /*
 565          * Check that all required volumes are available
 566          */
 567         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 568                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 569                 error = EINVAL;
 570         }
 571
 572         if (error) {
 573                 hammer_free_hmp(mp);
 574                 return (error);
 575         }
 576
 577         /*
 578          * No errors, setup enough of the mount point so we can lookup the
 579          * root vnode.
 580          */
 581         mp->mnt_iosize_max = MAXPHYS;
 582         mp->mnt_kern_flag |= MNTK_FSMID;
 583
 584         /*
 585          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 586          * will acquire a per-mount token prior to entry and release it
 587          * on return, so even if we do not specify it we no longer get
 588          * the BGL regardlless of how we are flagged.
 589          */
 590         mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE |
 591                              MNTK_IN_MPSAFE;
 592
 593         /*
 594          * note: f_iosize is used by vnode_pager_haspage() when constructing
 595          * its VOP_BMAP call.
 596          */
 597         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 598         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 599
 600         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 601         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 602
 603         mp->mnt_maxsymlinklen = 255;
 604         mp->mnt_flag |= MNT_LOCAL;
 605
 606         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 607         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 608         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 609
 610         /*
 611          * The root volume's ondisk pointer is only valid if we hold a
 612          * reference to it.
 613          */
 614         rootvol = hammer_get_root_volume(hmp, &error);
 615         if (error)
 616                 goto failed;
 617
 618         /*
 619          * Perform any necessary UNDO operations.  The recovery code does
 620          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 621          * and then re-copy it again after recovery is complete.
 622          *
 623          * If this is a read-only mount the UNDO information is retained
 624          * in memory in the form of dirty buffer cache buffers, and not
 625          * written back to the media.
 626          */
 627         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 628               sizeof(hmp->blockmap));
 629
 630         /*
 631          * Check filesystem version
 632          */
 633         hmp->version = rootvol->ondisk->vol_version;
 634         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 635             hmp->version > HAMMER_VOL_VERSION_MAX) {
 636                 kprintf("HAMMER: mount unsupported fs version %d\n",
 637                         hmp->version);
 638                 error = ERANGE;
 639                 goto done;
 640         }
 641
 642         /*
 643          * The undo_rec_limit limits the size of flush groups to avoid
 644          * blowing out the UNDO FIFO.  This calculation is typically in
 645          * the tens of thousands and is designed primarily when small
 646          * HAMMER filesystems are created.
 647          */
 648         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 649         if (hammer_debug_general & 0x0001)
 650                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 651
 652         /*
 653          * NOTE: Recover stage1 not only handles meta-data recovery, it
 654          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 655          */
 656         error = hammer_recover_stage1(hmp, rootvol);
 657         if (error) {
 658                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 659                 goto done;
 660         }
 661
 662         /*
 663          * Finish setup now that we have a good root volume.
 664          *
 665          * The top 16 bits of fsid.val[1] is a pfs id.
 666          */
 667         ksnprintf(mp->mnt_stat.f_mntfromname,
 668                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 669                   rootvol->ondisk->vol_name);
 670         mp->mnt_stat.f_fsid.val[0] =
 671                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 672         mp->mnt_stat.f_fsid.val[1] =
 673                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 674         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 675
 676         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 677         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 678                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 679
 680         /*
 681          * Certain often-modified fields in the root volume are cached in
 682          * the hammer_mount structure so we do not have to generate lots
 683          * of little UNDO structures for them.
 684          *
 685          * Recopy after recovery.  This also has the side effect of
 686          * setting our cached undo FIFO's first_offset, which serves to
 687          * placemark the FIFO start for the NEXT flush cycle while the
 688          * on-disk first_offset represents the LAST flush cycle.
 689          */
 690         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 691         hmp->flush_tid1 = hmp->next_tid;
 692         hmp->flush_tid2 = hmp->next_tid;
 693         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 694               sizeof(hmp->blockmap));
 695         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 696
 697         hammer_flusher_create(hmp);
 698
 699         /*
 700          * Locate the root directory using the root cluster's B-Tree as a
 701          * starting point.  The root directory uses an obj_id of 1.
 702          *
 703          * FUTURE: Leave the root directory cached referenced but unlocked
 704          * in hmp->rootvp (need to flush it on unmount).
 705          */
 706         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 707         if (error)
 708                 goto done;
 709         vput(rootvp);
 710         /*vn_unlock(hmp->rootvp);*/
 711         if (hmp->ronly == 0)
 712                 error = hammer_recover_stage2(hmp, rootvol);
 713
 714 done:
 715         hammer_rel_volume(rootvol, 0);
 716 failed:
 717         /*
 718          * Cleanup and return.
 719          */
 720         if (error)
 721                 hammer_free_hmp(mp);
 722         return (error);
 723 }
 724
 725 static int
 726 hammer_vfs_unmount(struct mount *mp, int mntflags)
 727 {
 728 #if 0
 729         struct hammer_mount *hmp = (void *)mp->mnt_data;
 730 #endif
 731         int flags;
 732         int error;
 733
 734         /*
 735          * Clean out the vnodes
 736          */
 737         flags = 0;
 738         if (mntflags & MNT_FORCE)
 739                 flags |= FORCECLOSE;
 740         if ((error = vflush(mp, 0, flags)) != 0)
 741                 return (error);
 742
 743         /*
 744          * Clean up the internal mount structure and related entities.  This
 745          * may issue I/O.
 746          */
 747         hammer_free_hmp(mp);
 748         return(0);
 749 }
 750
 751 /*
 752  * Clean up the internal mount structure and disassociate it from the mount.
 753  * This may issue I/O.
 754  */
 755 static void
 756 hammer_free_hmp(struct mount *mp)
 757 {
 758         struct hammer_mount *hmp = (void *)mp->mnt_data;
 759         hammer_flush_group_t flg;
 760         int count;
 761         int dummy;
 762
 763         /*
 764          * Flush anything dirty.  This won't even run if the
 765          * filesystem errored-out.
 766          */
 767         count = 0;
 768         while (hammer_flusher_haswork(hmp)) {
 769                 hammer_flusher_sync(hmp);
 770                 ++count;
 771                 if (count >= 5) {
 772                         if (count == 5)
 773                                 kprintf("HAMMER: umount flushing.");
 774                         else
 775                                 kprintf(".");
 776                         tsleep(&dummy, 0, "hmrufl", hz);
 777                 }
 778                 if (count == 30) {
 779                         kprintf("giving up\n");
 780                         break;
 781                 }
 782         }
 783         if (count >= 5 && count < 30)
 784                 kprintf("\n");
 785
 786         /*
 787          * If the mount had a critical error we have to destroy any
 788          * remaining inodes before we can finish cleaning up the flusher.
 789          */
 790         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 791                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 792                         hammer_destroy_inode_callback, NULL);
 793         }
 794
 795         /*
 796          * There shouldn't be any inodes left now and any left over
 797          * flush groups should now be empty.
 798          */
 799         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 800         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 801                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 802                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 803                 if (flg->refs) {
 804                         kprintf("HAMMER: Warning, flush_group %p was "
 805                                 "not empty on umount!\n", flg);
 806                 }
 807                 kfree(flg, hmp->m_misc);
 808         }
 809
 810         /*
 811          * We can finally destroy the flusher
 812          */
 813         hammer_flusher_destroy(hmp);
 814
 815         /*
 816          * We may have held recovered buffers due to a read-only mount.
 817          * These must be discarded.
 818          */
 819         if (hmp->ronly)
 820                 hammer_recover_flush_buffers(hmp, NULL, -1);
 821
 822         /*
 823          * Unload buffers and then volumes
 824          */
 825         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 826                 hammer_unload_buffer, NULL);
 827         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 828                 hammer_unload_volume, NULL);
 829
 830         mp->mnt_data = NULL;
 831         mp->mnt_flag &= ~MNT_LOCAL;
 832         hmp->mp = NULL;
 833         hammer_destroy_objid_cache(hmp);
 834         kmalloc_destroy(&hmp->m_misc);
 835         kmalloc_destroy(&hmp->m_inodes);
 836         kfree(hmp, M_HAMMER);
 837 }
 838
 839 /*
 840  * Report critical errors.  ip may be NULL.
 841  */
 842 void
 843 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 844                       int error, const char *msg)
 845 {
 846         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 847
 848         krateprintf(&hmp->krate,
 849                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 850                     hmp->mp->mnt_stat.f_mntfromname,
 851                     (intmax_t)(ip ? ip->obj_id : -1),
 852                     error, msg);
 853
 854         if (hmp->ronly == 0) {
 855                 hmp->ronly = 2;         /* special errored read-only mode */
 856                 hmp->mp->mnt_flag |= MNT_RDONLY;
 857                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 858                         hmp->mp->mnt_stat.f_mntfromname);
 859         }
 860         hmp->error = error;
 861         if (hammer_debug_critical)
 862                 Debugger("Entering debugger");
 863 }
 864
 865
 866 /*
 867  * Obtain a vnode for the specified inode number.  An exclusively locked
 868  * vnode is returned.
 869  */
 870 int
 871 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 872                 ino_t ino, struct vnode **vpp)
 873 {
 874         struct hammer_transaction trans;
 875         struct hammer_mount *hmp = (void *)mp->mnt_data;
 876         struct hammer_inode *ip;
 877         int error;
 878         u_int32_t localization;
 879
 880         hammer_simple_transaction(&trans, hmp);
 881
 882         /*
 883          * If a directory vnode is supplied (mainly NFS) then we can acquire
 884          * the PFS domain from it.  Otherwise we would only be able to vget
 885          * inodes in the root PFS.
 886          */
 887         if (dvp) {
 888                 localization = HAMMER_DEF_LOCALIZATION +
 889                                 VTOI(dvp)->obj_localization;
 890         } else {
 891                 localization = HAMMER_DEF_LOCALIZATION;
 892         }
 893
 894         /*
 895          * Lookup the requested HAMMER inode.  The structure must be
 896          * left unlocked while we manipulate the related vnode to avoid
 897          * a deadlock.
 898          */
 899         ip = hammer_get_inode(&trans, NULL, ino,
 900                               hmp->asof, localization,
 901                               0, &error);
 902         if (ip == NULL) {
 903                 *vpp = NULL;
 904                 hammer_done_transaction(&trans);
 905                 return(error);
 906         }
 907         error = hammer_get_vnode(ip, vpp);
 908         hammer_rel_inode(ip, 0);
 909         hammer_done_transaction(&trans);
 910         return (error);
 911 }
 912
 913 /*
 914  * Return the root vnode for the filesystem.
 915  *
 916  * HAMMER stores the root vnode in the hammer_mount structure so
 917  * getting it is easy.
 918  */
 919 static int
 920 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 921 {
 922 #if 0
 923         struct hammer_mount *hmp = (void *)mp->mnt_data;
 924 #endif
 925         int error;
 926
 927         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 928         return (error);
 929 }
 930
 931 static int
 932 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 933 {
 934         struct hammer_mount *hmp = (void *)mp->mnt_data;
 935         hammer_volume_t volume;
 936         hammer_volume_ondisk_t ondisk;
 937         int error;
 938         int64_t bfree;
 939         int64_t breserved;
 940
 941         volume = hammer_get_root_volume(hmp, &error);
 942         if (error)
 943                 return(error);
 944         ondisk = volume->ondisk;
 945
 946         /*
 947          * Basic stats
 948          */
 949         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 950         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 951         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 952         hammer_rel_volume(volume, 0);
 953
 954         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 955         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 956         if (mp->mnt_stat.f_files < 0)
 957                 mp->mnt_stat.f_files = 0;
 958
 959         *sbp = mp->mnt_stat;
 960         return(0);
 961 }
 962
 963 static int
 964 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 965 {
 966         struct hammer_mount *hmp = (void *)mp->mnt_data;
 967         hammer_volume_t volume;
 968         hammer_volume_ondisk_t ondisk;
 969         int error;
 970         int64_t bfree;
 971         int64_t breserved;
 972
 973         volume = hammer_get_root_volume(hmp, &error);
 974         if (error)
 975                 return(error);
 976         ondisk = volume->ondisk;
 977
 978         /*
 979          * Basic stats
 980          */
 981         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 982         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 983         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 984         hammer_rel_volume(volume, 0);
 985
 986         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 987         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 988         if (mp->mnt_vstat.f_files < 0)
 989                 mp->mnt_vstat.f_files = 0;
 990         *sbp = mp->mnt_vstat;
 991         return(0);
 992 }
 993
 994 /*
 995  * Sync the filesystem.  Currently we have to run it twice, the second
 996  * one will advance the undo start index to the end index, so if a crash
 997  * occurs no undos will be run on mount.
 998  *
 999  * We do not sync the filesystem if we are called from a panic.  If we did
1000  * we might end up blowing up a sync that was already in progress.
1001  */
1002 static int
1003 hammer_vfs_sync(struct mount *mp, int waitfor)
1004 {
1005         struct hammer_mount *hmp = (void *)mp->mnt_data;
1006         int error;
1007
1008         if (panicstr == NULL) {
1009                 error = hammer_sync_hmp(hmp, waitfor);
1010         } else {
1011                 error = EIO;
1012         }
1013         return (error);
1014 }
1015
1016 /*
1017  * Convert a vnode to a file handle.
1018  */
1019 static int
1020 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1021 {
1022         hammer_inode_t ip;
1023
1024         KKASSERT(MAXFIDSZ >= 16);
1025         ip = VTOI(vp);
1026         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1027         fhp->fid_ext = ip->obj_localization >> 16;
1028         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1029         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1030         return(0);
1031 }
1032
1033
1034 /*
1035  * Convert a file handle back to a vnode.
1036  *
1037  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1038  * null mount.
1039  */
1040 static int
1041 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1042                   struct fid *fhp, struct vnode **vpp)
1043 {
1044         struct hammer_transaction trans;
1045         struct hammer_inode *ip;
1046         struct hammer_inode_info info;
1047         int error;
1048         u_int32_t localization;
1049
1050         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1051         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1052         if (rootvp)
1053                 localization = VTOI(rootvp)->obj_localization;
1054         else
1055                 localization = (u_int32_t)fhp->fid_ext << 16;
1056
1057         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1058
1059         /*
1060          * Get/allocate the hammer_inode structure.  The structure must be
1061          * unlocked while we manipulate the related vnode to avoid a
1062          * deadlock.
1063          */
1064         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1065                               info.obj_asof, localization, 0, &error);
1066         if (ip) {
1067                 error = hammer_get_vnode(ip, vpp);
1068                 hammer_rel_inode(ip, 0);
1069         } else {
1070                 *vpp = NULL;
1071         }
1072         hammer_done_transaction(&trans);
1073         return (error);
1074 }
1075
1076 static int
1077 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1078                     int *exflagsp, struct ucred **credanonp)
1079 {
1080         hammer_mount_t hmp = (void *)mp->mnt_data;
1081         struct netcred *np;
1082         int error;
1083
1084         np = vfs_export_lookup(mp, &hmp->export, nam);
1085         if (np) {
1086                 *exflagsp = np->netc_exflags;
1087                 *credanonp = &np->netc_anon;
1088                 error = 0;
1089         } else {
1090                 error = EACCES;
1091         }
1092         return (error);
1093
1094 }
1095
1096 int
1097 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1098 {
1099         hammer_mount_t hmp = (void *)mp->mnt_data;
1100         int error;
1101
1102         switch(op) {
1103         case MOUNTCTL_SET_EXPORT:
1104                 error = vfs_export(mp, &hmp->export, export);
1105                 break;
1106         default:
1107                 error = EOPNOTSUPP;
1108                 break;
1109         }
1110         return(error);
1111 }
1112