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;
 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         int maxinodes;
 324         char *next_volume_ptr = NULL;
 325
 326         /*
 327          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 328          */
 329         if (mntpt == NULL) {
 330                 bzero(&info, sizeof(info));
 331                 info.asof = 0;
 332                 info.hflags = 0;
 333                 info.nvolumes = 1;
 334
 335                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 336
 337                 /* Count number of volumes separated by ':' */
 338                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 339                         if (*p == ':') {
 340                                 ++info.nvolumes;
 341                         }
 342                 }
 343
 344                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 345         } else {
 346                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 347                         return (error);
 348         }
 349
 350         /*
 351          * updating or new mount
 352          */
 353         if (mp->mnt_flag & MNT_UPDATE) {
 354                 hmp = (void *)mp->mnt_data;
 355                 KKASSERT(hmp != NULL);
 356         } else {
 357                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 358                         return (EINVAL);
 359                 hmp = NULL;
 360         }
 361
 362         /*
 363          * master-id validation.  The master id may not be changed by a
 364          * mount update.
 365          */
 366         if (info.hflags & HMNT_MASTERID) {
 367                 if (hmp && hmp->master_id != info.master_id) {
 368                         kprintf("hammer: cannot change master id "
 369                                 "with mount update\n");
 370                         return(EINVAL);
 371                 }
 372                 master_id = info.master_id;
 373                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 374                         return (EINVAL);
 375         } else {
 376                 if (hmp)
 377                         master_id = hmp->master_id;
 378                 else
 379                         master_id = 0;
 380         }
 381
 382         /*
 383          * Interal mount data structure
 384          */
 385         if (hmp == NULL) {
 386                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 387                 mp->mnt_data = (qaddr_t)hmp;
 388                 hmp->mp = mp;
 389                 /*TAILQ_INIT(&hmp->recycle_list);*/
 390
 391                 /*
 392                  * Make sure kmalloc type limits are set appropriately.  If root
 393                  * increases the vnode limit you may have to do a dummy remount
 394                  * to adjust the HAMMER inode limit.
 395                  */
 396                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 397                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 398
 399                 maxinodes = desiredvnodes + desiredvnodes / 5 +
 400                             hammer_limit_reclaim * 2;
 401                 kmalloc_raise_limit(hmp->m_inodes,
 402                                     maxinodes * sizeof(struct hammer_inode));
 403
 404                 hmp->root_btree_beg.localization = 0x00000000U;
 405                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 406                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 407                 hmp->root_btree_beg.create_tid = 1;
 408                 hmp->root_btree_beg.delete_tid = 1;
 409                 hmp->root_btree_beg.rec_type = 0;
 410                 hmp->root_btree_beg.obj_type = 0;
 411
 412                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 413                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 414                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 415                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 416                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 417                 hmp->root_btree_end.rec_type = 0xFFFFU;
 418                 hmp->root_btree_end.obj_type = 0;
 419
 420                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 421                 hmp->krate.count = -16; /* initial burst */
 422
 423                 hmp->sync_lock.refs = 1;
 424                 hmp->free_lock.refs = 1;
 425                 hmp->undo_lock.refs = 1;
 426                 hmp->blkmap_lock.refs = 1;
 427                 hmp->snapshot_lock.refs = 1;
 428                 hmp->volume_lock.refs = 1;
 429
 430                 TAILQ_INIT(&hmp->delay_list);
 431                 TAILQ_INIT(&hmp->flush_group_list);
 432                 TAILQ_INIT(&hmp->objid_cache_list);
 433                 TAILQ_INIT(&hmp->undo_lru_list);
 434                 TAILQ_INIT(&hmp->reclaim_list);
 435         }
 436         hmp->hflags &= ~HMNT_USERFLAGS;
 437         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 438
 439         hmp->master_id = master_id;
 440
 441         if (info.asof) {
 442                 mp->mnt_flag |= MNT_RDONLY;
 443                 hmp->asof = info.asof;
 444         } else {
 445                 hmp->asof = HAMMER_MAX_TID;
 446         }
 447
 448         hmp->volume_to_remove = -1;
 449
 450         /*
 451          * Re-open read-write if originally read-only, or vise-versa.
 452          *
 453          * When going from read-only to read-write execute the stage2
 454          * recovery if it has not already been run.
 455          */
 456         if (mp->mnt_flag & MNT_UPDATE) {
 457                 error = 0;
 458                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 459                         kprintf("HAMMER read-only -> read-write\n");
 460                         hmp->ronly = 0;
 461                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 462                                 hammer_adjust_volume_mode, NULL);
 463                         rootvol = hammer_get_root_volume(hmp, &error);
 464                         if (rootvol) {
 465                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 466                                 error = hammer_recover_stage2(hmp, rootvol);
 467                                 bcopy(rootvol->ondisk->vol0_blockmap,
 468                                       hmp->blockmap,
 469                                       sizeof(hmp->blockmap));
 470                                 hammer_rel_volume(rootvol, 0);
 471                         }
 472                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 473                                 hammer_reload_inode, NULL);
 474                         /* kernel clears MNT_RDONLY */
 475                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 476                         kprintf("HAMMER read-write -> read-only\n");
 477                         hmp->ronly = 1; /* messy */
 478                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 479                                 hammer_reload_inode, NULL);
 480                         hmp->ronly = 0;
 481                         hammer_flusher_sync(hmp);
 482                         hammer_flusher_sync(hmp);
 483                         hammer_flusher_sync(hmp);
 484                         hmp->ronly = 1;
 485                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 486                                 hammer_adjust_volume_mode, NULL);
 487                 }
 488                 return(error);
 489         }
 490
 491         RB_INIT(&hmp->rb_vols_root);
 492         RB_INIT(&hmp->rb_inos_root);
 493         RB_INIT(&hmp->rb_redo_root);
 494         RB_INIT(&hmp->rb_nods_root);
 495         RB_INIT(&hmp->rb_undo_root);
 496         RB_INIT(&hmp->rb_resv_root);
 497         RB_INIT(&hmp->rb_bufs_root);
 498         RB_INIT(&hmp->rb_pfsm_root);
 499
 500         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 501
 502         TAILQ_INIT(&hmp->volu_list);
 503         TAILQ_INIT(&hmp->undo_list);
 504         TAILQ_INIT(&hmp->data_list);
 505         TAILQ_INIT(&hmp->meta_list);
 506         TAILQ_INIT(&hmp->lose_list);
 507
 508         /*
 509          * Load volumes
 510          */
 511         path = objcache_get(namei_oc, M_WAITOK);
 512         hmp->nvolumes = -1;
 513         for (i = 0; i < info.nvolumes; ++i) {
 514                 if (mntpt == NULL) {
 515                         /*
 516                          * Root mount.
 517                          */
 518                         KKASSERT(next_volume_ptr != NULL);
 519                         strcpy(path, "");
 520                         if (*next_volume_ptr != '/') {
 521                                 /* relative path */
 522                                 strcpy(path, "/dev/");
 523                         }
 524                         int k;
 525                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 526                                 if (*next_volume_ptr == '\0') {
 527                                         break;
 528                                 } else if (*next_volume_ptr == ':') {
 529                                         ++next_volume_ptr;
 530                                         break;
 531                                 } else {
 532                                         path[k] = *next_volume_ptr;
 533                                         ++next_volume_ptr;
 534                                 }
 535                         }
 536                         path[k] = '\0';
 537
 538                         error = 0;
 539                         cdev_t dev = kgetdiskbyname(path);
 540                         error = bdevvp(dev, &devvp);
 541                         if (error) {
 542                                 kprintf("hammer_mountroot: can't find devvp\n");
 543                         }
 544                 } else {
 545                         error = copyin(&info.volumes[i], &upath,
 546                                        sizeof(char *));
 547                         if (error == 0)
 548                                 error = copyinstr(upath, path,
 549                                                   MAXPATHLEN, NULL);
 550                 }
 551                 if (error == 0)
 552                         error = hammer_install_volume(hmp, path, devvp);
 553                 if (error)
 554                         break;
 555         }
 556         objcache_put(namei_oc, path);
 557
 558         /*
 559          * Make sure we found a root volume
 560          */
 561         if (error == 0 && hmp->rootvol == NULL) {
 562                 kprintf("hammer_mount: No root volume found!\n");
 563                 error = EINVAL;
 564         }
 565
 566         /*
 567          * Check that all required volumes are available
 568          */
 569         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 570                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 571                 error = EINVAL;
 572         }
 573
 574         if (error) {
 575                 hammer_free_hmp(mp);
 576                 return (error);
 577         }
 578
 579         /*
 580          * No errors, setup enough of the mount point so we can lookup the
 581          * root vnode.
 582          */
 583         mp->mnt_iosize_max = MAXPHYS;
 584         mp->mnt_kern_flag |= MNTK_FSMID;
 585
 586         /*
 587          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 588          * will acquire a per-mount token prior to entry and release it
 589          * on return, so even if we do not specify it we no longer get
 590          * the BGL regardlless of how we are flagged.
 591          */
 592         mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE |
 593                              MNTK_IN_MPSAFE;
 594
 595         /*
 596          * note: f_iosize is used by vnode_pager_haspage() when constructing
 597          * its VOP_BMAP call.
 598          */
 599         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 600         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 601
 602         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 603         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 604
 605         mp->mnt_maxsymlinklen = 255;
 606         mp->mnt_flag |= MNT_LOCAL;
 607
 608         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 609         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 610         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 611
 612         /*
 613          * The root volume's ondisk pointer is only valid if we hold a
 614          * reference to it.
 615          */
 616         rootvol = hammer_get_root_volume(hmp, &error);
 617         if (error)
 618                 goto failed;
 619
 620         /*
 621          * Perform any necessary UNDO operations.  The recovery code does
 622          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 623          * and then re-copy it again after recovery is complete.
 624          *
 625          * If this is a read-only mount the UNDO information is retained
 626          * in memory in the form of dirty buffer cache buffers, and not
 627          * written back to the media.
 628          */
 629         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 630               sizeof(hmp->blockmap));
 631
 632         /*
 633          * Check filesystem version
 634          */
 635         hmp->version = rootvol->ondisk->vol_version;
 636         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 637             hmp->version > HAMMER_VOL_VERSION_MAX) {
 638                 kprintf("HAMMER: mount unsupported fs version %d\n",
 639                         hmp->version);
 640                 error = ERANGE;
 641                 goto done;
 642         }
 643
 644         /*
 645          * The undo_rec_limit limits the size of flush groups to avoid
 646          * blowing out the UNDO FIFO.  This calculation is typically in
 647          * the tens of thousands and is designed primarily when small
 648          * HAMMER filesystems are created.
 649          */
 650         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 651         if (hammer_debug_general & 0x0001)
 652                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 653
 654         /*
 655          * NOTE: Recover stage1 not only handles meta-data recovery, it
 656          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 657          */
 658         error = hammer_recover_stage1(hmp, rootvol);
 659         if (error) {
 660                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 661                 goto done;
 662         }
 663
 664         /*
 665          * Finish setup now that we have a good root volume.
 666          *
 667          * The top 16 bits of fsid.val[1] is a pfs id.
 668          */
 669         ksnprintf(mp->mnt_stat.f_mntfromname,
 670                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 671                   rootvol->ondisk->vol_name);
 672         mp->mnt_stat.f_fsid.val[0] =
 673                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 674         mp->mnt_stat.f_fsid.val[1] =
 675                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 676         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 677
 678         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 679         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 680                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 681
 682         /*
 683          * Certain often-modified fields in the root volume are cached in
 684          * the hammer_mount structure so we do not have to generate lots
 685          * of little UNDO structures for them.
 686          *
 687          * Recopy after recovery.  This also has the side effect of
 688          * setting our cached undo FIFO's first_offset, which serves to
 689          * placemark the FIFO start for the NEXT flush cycle while the
 690          * on-disk first_offset represents the LAST flush cycle.
 691          */
 692         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 693         hmp->flush_tid1 = hmp->next_tid;
 694         hmp->flush_tid2 = hmp->next_tid;
 695         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 696               sizeof(hmp->blockmap));
 697         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 698
 699         hammer_flusher_create(hmp);
 700
 701         /*
 702          * Locate the root directory using the root cluster's B-Tree as a
 703          * starting point.  The root directory uses an obj_id of 1.
 704          *
 705          * FUTURE: Leave the root directory cached referenced but unlocked
 706          * in hmp->rootvp (need to flush it on unmount).
 707          */
 708         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 709         if (error)
 710                 goto done;
 711         vput(rootvp);
 712         /*vn_unlock(hmp->rootvp);*/
 713         if (hmp->ronly == 0)
 714                 error = hammer_recover_stage2(hmp, rootvol);
 715
 716 done:
 717         hammer_rel_volume(rootvol, 0);
 718 failed:
 719         /*
 720          * Cleanup and return.
 721          */
 722         if (error)
 723                 hammer_free_hmp(mp);
 724         return (error);
 725 }
 726
 727 static int
 728 hammer_vfs_unmount(struct mount *mp, int mntflags)
 729 {
 730 #if 0
 731         struct hammer_mount *hmp = (void *)mp->mnt_data;
 732 #endif
 733         int flags;
 734         int error;
 735
 736         /*
 737          * Clean out the vnodes
 738          */
 739         flags = 0;
 740         if (mntflags & MNT_FORCE)
 741                 flags |= FORCECLOSE;
 742         if ((error = vflush(mp, 0, flags)) != 0)
 743                 return (error);
 744
 745         /*
 746          * Clean up the internal mount structure and related entities.  This
 747          * may issue I/O.
 748          */
 749         hammer_free_hmp(mp);
 750         return(0);
 751 }
 752
 753 /*
 754  * Clean up the internal mount structure and disassociate it from the mount.
 755  * This may issue I/O.
 756  */
 757 static void
 758 hammer_free_hmp(struct mount *mp)
 759 {
 760         struct hammer_mount *hmp = (void *)mp->mnt_data;
 761         hammer_flush_group_t flg;
 762         int count;
 763         int dummy;
 764
 765         /*
 766          * Flush anything dirty.  This won't even run if the
 767          * filesystem errored-out.
 768          */
 769         count = 0;
 770         while (hammer_flusher_haswork(hmp)) {
 771                 hammer_flusher_sync(hmp);
 772                 ++count;
 773                 if (count >= 5) {
 774                         if (count == 5)
 775                                 kprintf("HAMMER: umount flushing.");
 776                         else
 777                                 kprintf(".");
 778                         tsleep(&dummy, 0, "hmrufl", hz);
 779                 }
 780                 if (count == 30) {
 781                         kprintf("giving up\n");
 782                         break;
 783                 }
 784         }
 785         if (count >= 5 && count < 30)
 786                 kprintf("\n");
 787
 788         /*
 789          * If the mount had a critical error we have to destroy any
 790          * remaining inodes before we can finish cleaning up the flusher.
 791          */
 792         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 793                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 794                         hammer_destroy_inode_callback, NULL);
 795         }
 796
 797         /*
 798          * There shouldn't be any inodes left now and any left over
 799          * flush groups should now be empty.
 800          */
 801         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 802         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 803                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 804                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 805                 if (flg->refs) {
 806                         kprintf("HAMMER: Warning, flush_group %p was "
 807                                 "not empty on umount!\n", flg);
 808                 }
 809                 kfree(flg, hmp->m_misc);
 810         }
 811
 812         /*
 813          * We can finally destroy the flusher
 814          */
 815         hammer_flusher_destroy(hmp);
 816
 817         /*
 818          * We may have held recovered buffers due to a read-only mount.
 819          * These must be discarded.
 820          */
 821         if (hmp->ronly)
 822                 hammer_recover_flush_buffers(hmp, NULL, -1);
 823
 824         /*
 825          * Unload buffers and then volumes
 826          */
 827         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 828                 hammer_unload_buffer, NULL);
 829         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 830                 hammer_unload_volume, NULL);
 831
 832         mp->mnt_data = NULL;
 833         mp->mnt_flag &= ~MNT_LOCAL;
 834         hmp->mp = NULL;
 835         hammer_destroy_objid_cache(hmp);
 836         kmalloc_destroy(&hmp->m_misc);
 837         kmalloc_destroy(&hmp->m_inodes);
 838         kfree(hmp, M_HAMMER);
 839 }
 840
 841 /*
 842  * Report critical errors.  ip may be NULL.
 843  */
 844 void
 845 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 846                       int error, const char *msg)
 847 {
 848         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 849
 850         krateprintf(&hmp->krate,
 851                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 852                     hmp->mp->mnt_stat.f_mntfromname,
 853                     (intmax_t)(ip ? ip->obj_id : -1),
 854                     error, msg);
 855
 856         if (hmp->ronly == 0) {
 857                 hmp->ronly = 2;         /* special errored read-only mode */
 858                 hmp->mp->mnt_flag |= MNT_RDONLY;
 859                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 860                         hmp->mp->mnt_stat.f_mntfromname);
 861         }
 862         hmp->error = error;
 863         if (hammer_debug_critical)
 864                 Debugger("Entering debugger");
 865 }
 866
 867
 868 /*
 869  * Obtain a vnode for the specified inode number.  An exclusively locked
 870  * vnode is returned.
 871  */
 872 int
 873 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 874                 ino_t ino, struct vnode **vpp)
 875 {
 876         struct hammer_transaction trans;
 877         struct hammer_mount *hmp = (void *)mp->mnt_data;
 878         struct hammer_inode *ip;
 879         int error;
 880         u_int32_t localization;
 881
 882         hammer_simple_transaction(&trans, hmp);
 883
 884         /*
 885          * If a directory vnode is supplied (mainly NFS) then we can acquire
 886          * the PFS domain from it.  Otherwise we would only be able to vget
 887          * inodes in the root PFS.
 888          */
 889         if (dvp) {
 890                 localization = HAMMER_DEF_LOCALIZATION +
 891                                 VTOI(dvp)->obj_localization;
 892         } else {
 893                 localization = HAMMER_DEF_LOCALIZATION;
 894         }
 895
 896         /*
 897          * Lookup the requested HAMMER inode.  The structure must be
 898          * left unlocked while we manipulate the related vnode to avoid
 899          * a deadlock.
 900          */
 901         ip = hammer_get_inode(&trans, NULL, ino,
 902                               hmp->asof, localization,
 903                               0, &error);
 904         if (ip == NULL) {
 905                 *vpp = NULL;
 906                 hammer_done_transaction(&trans);
 907                 return(error);
 908         }
 909         error = hammer_get_vnode(ip, vpp);
 910         hammer_rel_inode(ip, 0);
 911         hammer_done_transaction(&trans);
 912         return (error);
 913 }
 914
 915 /*
 916  * Return the root vnode for the filesystem.
 917  *
 918  * HAMMER stores the root vnode in the hammer_mount structure so
 919  * getting it is easy.
 920  */
 921 static int
 922 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 923 {
 924 #if 0
 925         struct hammer_mount *hmp = (void *)mp->mnt_data;
 926 #endif
 927         int error;
 928
 929         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 930         return (error);
 931 }
 932
 933 static int
 934 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 935 {
 936         struct hammer_mount *hmp = (void *)mp->mnt_data;
 937         hammer_volume_t volume;
 938         hammer_volume_ondisk_t ondisk;
 939         int error;
 940         int64_t bfree;
 941         int64_t breserved;
 942
 943         volume = hammer_get_root_volume(hmp, &error);
 944         if (error)
 945                 return(error);
 946         ondisk = volume->ondisk;
 947
 948         /*
 949          * Basic stats
 950          */
 951         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 952         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 953         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 954         hammer_rel_volume(volume, 0);
 955
 956         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 957         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 958         if (mp->mnt_stat.f_files < 0)
 959                 mp->mnt_stat.f_files = 0;
 960
 961         *sbp = mp->mnt_stat;
 962         return(0);
 963 }
 964
 965 static int
 966 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 967 {
 968         struct hammer_mount *hmp = (void *)mp->mnt_data;
 969         hammer_volume_t volume;
 970         hammer_volume_ondisk_t ondisk;
 971         int error;
 972         int64_t bfree;
 973         int64_t breserved;
 974
 975         volume = hammer_get_root_volume(hmp, &error);
 976         if (error)
 977                 return(error);
 978         ondisk = volume->ondisk;
 979
 980         /*
 981          * Basic stats
 982          */
 983         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 984         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 985         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 986         hammer_rel_volume(volume, 0);
 987
 988         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 989         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 990         if (mp->mnt_vstat.f_files < 0)
 991                 mp->mnt_vstat.f_files = 0;
 992         *sbp = mp->mnt_vstat;
 993         return(0);
 994 }
 995
 996 /*
 997  * Sync the filesystem.  Currently we have to run it twice, the second
 998  * one will advance the undo start index to the end index, so if a crash
 999  * occurs no undos will be run on mount.
1000  *
1001  * We do not sync the filesystem if we are called from a panic.  If we did
1002  * we might end up blowing up a sync that was already in progress.
1003  */
1004 static int
1005 hammer_vfs_sync(struct mount *mp, int waitfor)
1006 {
1007         struct hammer_mount *hmp = (void *)mp->mnt_data;
1008         int error;
1009
1010         if (panicstr == NULL) {
1011                 error = hammer_sync_hmp(hmp, waitfor);
1012         } else {
1013                 error = EIO;
1014         }
1015         return (error);
1016 }
1017
1018 /*
1019  * Convert a vnode to a file handle.
1020  */
1021 static int
1022 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1023 {
1024         hammer_inode_t ip;
1025
1026         KKASSERT(MAXFIDSZ >= 16);
1027         ip = VTOI(vp);
1028         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1029         fhp->fid_ext = ip->obj_localization >> 16;
1030         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1031         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1032         return(0);
1033 }
1034
1035
1036 /*
1037  * Convert a file handle back to a vnode.
1038  *
1039  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1040  * null mount.
1041  */
1042 static int
1043 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1044                   struct fid *fhp, struct vnode **vpp)
1045 {
1046         struct hammer_transaction trans;
1047         struct hammer_inode *ip;
1048         struct hammer_inode_info info;
1049         int error;
1050         u_int32_t localization;
1051
1052         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1053         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1054         if (rootvp)
1055                 localization = VTOI(rootvp)->obj_localization;
1056         else
1057                 localization = (u_int32_t)fhp->fid_ext << 16;
1058
1059         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1060
1061         /*
1062          * Get/allocate the hammer_inode structure.  The structure must be
1063          * unlocked while we manipulate the related vnode to avoid a
1064          * deadlock.
1065          */
1066         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1067                               info.obj_asof, localization, 0, &error);
1068         if (ip) {
1069                 error = hammer_get_vnode(ip, vpp);
1070                 hammer_rel_inode(ip, 0);
1071         } else {
1072                 *vpp = NULL;
1073         }
1074         hammer_done_transaction(&trans);
1075         return (error);
1076 }
1077
1078 static int
1079 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1080                     int *exflagsp, struct ucred **credanonp)
1081 {
1082         hammer_mount_t hmp = (void *)mp->mnt_data;
1083         struct netcred *np;
1084         int error;
1085
1086         np = vfs_export_lookup(mp, &hmp->export, nam);
1087         if (np) {
1088                 *exflagsp = np->netc_exflags;
1089                 *credanonp = &np->netc_anon;
1090                 error = 0;
1091         } else {
1092                 error = EACCES;
1093         }
1094         return (error);
1095
1096 }
1097
1098 int
1099 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1100 {
1101         hammer_mount_t hmp = (void *)mp->mnt_data;
1102         int error;
1103
1104         switch(op) {
1105         case MOUNTCTL_SET_EXPORT:
1106                 error = vfs_export(mp, &hmp->export, export);
1107                 break;
1108         default:
1109                 error = EOPNOTSUPP;
1110                 break;
1111         }
1112         return(error);
1113 }
1114