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