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
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/malloc.h>
  41 #include <sys/nlookup.h>
  42 #include <sys/fcntl.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/buf.h>
  45 #include <sys/buf2.h>
  46 #include "hammer.h"
  47
  48 /*
  49  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  50  *        in conditionals.
  51  */
  52 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  53 int hammer_debug_io;
  54 int hammer_debug_general;
  55 int hammer_debug_debug = 1;             /* medium-error panics */
  56 int hammer_debug_inode;
  57 int hammer_debug_locks;
  58 int hammer_debug_btree;
  59 int hammer_debug_tid;
  60 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  61 int hammer_debug_recover_faults;
  62 int hammer_debug_critical;              /* non-zero enter debugger on error */
  63 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  64 int hammer_live_dedup = 0;
  65 int hammer_tdmux_ticks;
  66 int hammer_count_fsyncs;
  67 int hammer_count_inodes;
  68 int hammer_count_iqueued;
  69 int hammer_count_reclaims;
  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 = 2048;     /* per inode */
 106 int hammer_limit_reclaims;
 107 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
 108 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 109 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
 110 int hammer_bio_count;
 111 int hammer_verify_zone;
 112 int hammer_verify_data = 1;
 113 int hammer_write_mode;
 114 int hammer_double_buffer;
 115 int hammer_yield_check = 16;
 116 int hammer_fsync_mode = 3;
 117 int64_t hammer_contention_count;
 118 int64_t hammer_zone_limit;
 119
 120 /*
 121  * Live dedup debug counters (sysctls are writable so that counters
 122  * can be reset from userspace).
 123  */
 124 int64_t hammer_live_dedup_vnode_bcmps = 0;
 125 int64_t hammer_live_dedup_device_bcmps = 0;
 126 int64_t hammer_live_dedup_findblk_failures = 0;
 127 int64_t hammer_live_dedup_bmap_saves = 0;
 128
 129
 130 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 131
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 133            &hammer_supported_version, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 135            &hammer_debug_general, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 137            &hammer_debug_io, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 139            &hammer_debug_debug, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 141            &hammer_debug_inode, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 143            &hammer_debug_locks, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 145            &hammer_debug_btree, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 147            &hammer_debug_tid, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 149            &hammer_debug_recover, 0, "");
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 151            &hammer_debug_recover_faults, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 153            &hammer_debug_critical, 0, "");
 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 155            &hammer_cluster_enable, 0, "");
 156 /*
 157  * 0 - live dedup is disabled
 158  * 1 - dedup cache is populated on reads only
 159  * 2 - dedup cache is populated on both reads and writes
 160  */
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
 162            &hammer_live_dedup, 0, "Enable live dedup");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 164            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 165
 166 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 167            &hammer_limit_dirtybufspace, 0, "");
 168 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 169            &hammer_limit_recs, 0, "");
 170 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 171            &hammer_limit_inode_recs, 0, "");
 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 173            &hammer_limit_reclaims, 0, "");
 174 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 175            &hammer_live_dedup_cache_size, 0,
 176            "Number of cache entries");
 177 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 178            &hammer_limit_redo, 0, "");
 179
 180 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 181            &hammer_count_fsyncs, 0, "");
 182 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 183            &hammer_count_inodes, 0, "");
 184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 185            &hammer_count_iqueued, 0, "");
 186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 187            &hammer_count_reclaims, 0, "");
 188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 189            &hammer_count_records, 0, "");
 190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 191            &hammer_count_record_datas, 0, "");
 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 193            &hammer_count_volumes, 0, "");
 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 195            &hammer_count_buffers, 0, "");
 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 197            &hammer_count_nodes, 0, "");
 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 199            &hammer_count_extra_space_used, 0, "");
 200
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 202            &hammer_stats_btree_searches, 0, "");
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 204            &hammer_stats_btree_lookups, 0, "");
 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 206            &hammer_stats_btree_inserts, 0, "");
 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 208            &hammer_stats_btree_deletes, 0, "");
 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 210            &hammer_stats_btree_elements, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 212            &hammer_stats_btree_splits, 0, "");
 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 214            &hammer_stats_btree_iterations, 0, "");
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 216            &hammer_stats_btree_root_iterations, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 218            &hammer_stats_record_iterations, 0, "");
 219
 220 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 221            &hammer_stats_file_read, 0, "");
 222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 223            &hammer_stats_file_write, 0, "");
 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 225            &hammer_stats_file_iopsr, 0, "");
 226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 227            &hammer_stats_file_iopsw, 0, "");
 228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 229            &hammer_stats_disk_read, 0, "");
 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 231            &hammer_stats_disk_write, 0, "");
 232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 233            &hammer_stats_inode_flushes, 0, "");
 234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 235            &hammer_stats_commits, 0, "");
 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 237            &hammer_stats_undo, 0, "");
 238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 239            &hammer_stats_redo, 0, "");
 240
 241 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 242             &hammer_live_dedup_vnode_bcmps, 0,
 243             "successful vnode buffer comparisons");
 244 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 245             &hammer_live_dedup_device_bcmps, 0,
 246             "successful device buffer comparisons");
 247 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 248             &hammer_live_dedup_findblk_failures, 0,
 249             "block lookup failures for comparison");
 250 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 251             &hammer_live_dedup_bmap_saves, 0,
 252             "useful physical block lookups");
 253
 254 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 255            &hammer_count_dirtybufspace, 0, "");
 256 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 257            &hammer_count_refedbufs, 0, "");
 258 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 259            &hammer_count_reservations, 0, "");
 260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 261            &hammer_count_io_running_read, 0, "");
 262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 263            &hammer_count_io_locked, 0, "");
 264 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 265            &hammer_count_io_running_write, 0, "");
 266 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 267            &hammer_zone_limit, 0, "");
 268 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 269            &hammer_contention_count, 0, "");
 270 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 271            &hammer_autoflush, 0, "");
 272 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 273            &hammer_verify_zone, 0, "");
 274 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 275            &hammer_verify_data, 0, "");
 276 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 277            &hammer_write_mode, 0, "");
 278 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 279            &hammer_double_buffer, 0, "");
 280 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 281            &hammer_yield_check, 0, "");
 282 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 283            &hammer_fsync_mode, 0, "");
 284
 285 /* KTR_INFO_MASTER(hammer); */
 286
 287 /*
 288  * VFS ABI
 289  */
 290 static void     hammer_free_hmp(struct mount *mp);
 291
 292 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 293                                 struct ucred *cred);
 294 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 295 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 296 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 297                                 struct ucred *cred);
 298 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 299                                 struct ucred *cred);
 300 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 301 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 302                                 ino_t ino, struct vnode **vpp);
 303 static int      hammer_vfs_init(struct vfsconf *conf);
 304 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 305                                 struct fid *fhp, struct vnode **vpp);
 306 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 307 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 308                                 int *exflagsp, struct ucred **credanonp);
 309
 310
 311 static struct vfsops hammer_vfsops = {
 312         .vfs_mount      = hammer_vfs_mount,
 313         .vfs_unmount    = hammer_vfs_unmount,
 314         .vfs_root       = hammer_vfs_root,
 315         .vfs_statfs     = hammer_vfs_statfs,
 316         .vfs_statvfs    = hammer_vfs_statvfs,
 317         .vfs_sync       = hammer_vfs_sync,
 318         .vfs_vget       = hammer_vfs_vget,
 319         .vfs_init       = hammer_vfs_init,
 320         .vfs_vptofh     = hammer_vfs_vptofh,
 321         .vfs_fhtovp     = hammer_vfs_fhtovp,
 322         .vfs_checkexp   = hammer_vfs_checkexp
 323 };
 324
 325 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 326
 327 VFS_SET(hammer_vfsops, hammer, 0);
 328 MODULE_VERSION(hammer, 1);
 329
 330 static int
 331 hammer_vfs_init(struct vfsconf *conf)
 332 {
 333         int n;
 334
 335         /*
 336          * Wait up to this long for an exclusive deadlock to clear
 337          * before acquiring a new shared lock on the ip.  The deadlock
 338          * may have occured on a b-tree node related to the ip.
 339          */
 340         if (hammer_tdmux_ticks == 0)
 341                 hammer_tdmux_ticks = hz / 5;
 342
 343         /*
 344          * Autosize
 345          */
 346         if (hammer_limit_recs == 0) {
 347                 hammer_limit_recs = nbuf * 25;
 348                 n = kmalloc_limit(M_HAMMER) / 512;
 349                 if (hammer_limit_recs > n)
 350                         hammer_limit_recs = n;
 351         }
 352         if (hammer_limit_dirtybufspace == 0) {
 353                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 354                 if (hammer_limit_dirtybufspace < 100)
 355                         hammer_limit_dirtybufspace = 100;
 356         }
 357
 358         /*
 359          * The hammer_inode structure detaches from the vnode on reclaim.
 360          * This limits the number of inodes in this state to prevent a
 361          * memory pool blowout.
 362          */
 363         if (hammer_limit_reclaims == 0)
 364                 hammer_limit_reclaims = desiredvnodes / 10;
 365
 366         return(0);
 367 }
 368
 369 static int
 370 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 371                  struct ucred *cred)
 372 {
 373         struct hammer_mount_info info;
 374         hammer_mount_t hmp;
 375         hammer_volume_t rootvol;
 376         struct vnode *rootvp;
 377         struct vnode *devvp = NULL;
 378         const char *upath;      /* volume name in userspace */
 379         char *path;             /* volume name in system space */
 380         int error;
 381         int i;
 382         int master_id;
 383         char *next_volume_ptr = NULL;
 384
 385         /*
 386          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 387          */
 388         if (mntpt == NULL) {
 389                 bzero(&info, sizeof(info));
 390                 info.asof = 0;
 391                 info.hflags = 0;
 392                 info.nvolumes = 1;
 393
 394                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 395
 396                 /* Count number of volumes separated by ':' */
 397                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 398                         if (*p == ':') {
 399                                 ++info.nvolumes;
 400                         }
 401                 }
 402
 403                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 404         } else {
 405                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 406                         return (error);
 407         }
 408
 409         /*
 410          * updating or new mount
 411          */
 412         if (mp->mnt_flag & MNT_UPDATE) {
 413                 hmp = (void *)mp->mnt_data;
 414                 KKASSERT(hmp != NULL);
 415         } else {
 416                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 417                         return (EINVAL);
 418                 hmp = NULL;
 419         }
 420
 421         /*
 422          * master-id validation.  The master id may not be changed by a
 423          * mount update.
 424          */
 425         if (info.hflags & HMNT_MASTERID) {
 426                 if (hmp && hmp->master_id != info.master_id) {
 427                         kprintf("hammer: cannot change master id "
 428                                 "with mount update\n");
 429                         return(EINVAL);
 430                 }
 431                 master_id = info.master_id;
 432                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 433                         return (EINVAL);
 434         } else {
 435                 if (hmp)
 436                         master_id = hmp->master_id;
 437                 else
 438                         master_id = 0;
 439         }
 440
 441         /*
 442          * Internal mount data structure
 443          */
 444         if (hmp == NULL) {
 445                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 446                 mp->mnt_data = (qaddr_t)hmp;
 447                 hmp->mp = mp;
 448                 /*TAILQ_INIT(&hmp->recycle_list);*/
 449
 450                 /*
 451                  * Make sure kmalloc type limits are set appropriately.
 452                  *
 453                  * Our inode kmalloc group is sized based on maxvnodes
 454                  * (controlled by the system, not us).
 455                  */
 456                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 457                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 458
 459                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 460
 461                 hmp->root_btree_beg.localization = 0x00000000U;
 462                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 463                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 464                 hmp->root_btree_beg.create_tid = 1;
 465                 hmp->root_btree_beg.delete_tid = 1;
 466                 hmp->root_btree_beg.rec_type = 0;
 467                 hmp->root_btree_beg.obj_type = 0;
 468
 469                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 470                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 471                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 472                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 473                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 474                 hmp->root_btree_end.rec_type = 0xFFFFU;
 475                 hmp->root_btree_end.obj_type = 0;
 476
 477                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 478                 hmp->krate.count = -16; /* initial burst */
 479
 480                 hmp->sync_lock.refs = 1;
 481                 hmp->free_lock.refs = 1;
 482                 hmp->undo_lock.refs = 1;
 483                 hmp->blkmap_lock.refs = 1;
 484                 hmp->snapshot_lock.refs = 1;
 485                 hmp->volume_lock.refs = 1;
 486
 487                 TAILQ_INIT(&hmp->delay_list);
 488                 TAILQ_INIT(&hmp->flush_group_list);
 489                 TAILQ_INIT(&hmp->objid_cache_list);
 490                 TAILQ_INIT(&hmp->undo_lru_list);
 491                 TAILQ_INIT(&hmp->reclaim_list);
 492
 493                 RB_INIT(&hmp->rb_dedup_crc_root);
 494                 RB_INIT(&hmp->rb_dedup_off_root);
 495                 TAILQ_INIT(&hmp->dedup_lru_list);
 496         }
 497         hmp->hflags &= ~HMNT_USERFLAGS;
 498         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 499
 500         hmp->master_id = master_id;
 501
 502         if (info.asof) {
 503                 mp->mnt_flag |= MNT_RDONLY;
 504                 hmp->asof = info.asof;
 505         } else {
 506                 hmp->asof = HAMMER_MAX_TID;
 507         }
 508
 509         hmp->volume_to_remove = -1;
 510
 511         /*
 512          * Re-open read-write if originally read-only, or vise-versa.
 513          *
 514          * When going from read-only to read-write execute the stage2
 515          * recovery if it has not already been run.
 516          */
 517         if (mp->mnt_flag & MNT_UPDATE) {
 518                 lwkt_gettoken(&hmp->fs_token);
 519                 error = 0;
 520                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 521                         kprintf("HAMMER read-only -> read-write\n");
 522                         hmp->ronly = 0;
 523                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 524                                 hammer_adjust_volume_mode, NULL);
 525                         rootvol = hammer_get_root_volume(hmp, &error);
 526                         if (rootvol) {
 527                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 528                                 error = hammer_recover_stage2(hmp, rootvol);
 529                                 bcopy(rootvol->ondisk->vol0_blockmap,
 530                                       hmp->blockmap,
 531                                       sizeof(hmp->blockmap));
 532                                 hammer_rel_volume(rootvol, 0);
 533                         }
 534                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 535                                 hammer_reload_inode, NULL);
 536                         /* kernel clears MNT_RDONLY */
 537                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 538                         kprintf("HAMMER read-write -> read-only\n");
 539                         hmp->ronly = 1; /* messy */
 540                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 541                                 hammer_reload_inode, NULL);
 542                         hmp->ronly = 0;
 543                         hammer_flusher_sync(hmp);
 544                         hammer_flusher_sync(hmp);
 545                         hammer_flusher_sync(hmp);
 546                         hmp->ronly = 1;
 547                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 548                                 hammer_adjust_volume_mode, NULL);
 549                 }
 550                 lwkt_reltoken(&hmp->fs_token);
 551                 return(error);
 552         }
 553
 554         RB_INIT(&hmp->rb_vols_root);
 555         RB_INIT(&hmp->rb_inos_root);
 556         RB_INIT(&hmp->rb_redo_root);
 557         RB_INIT(&hmp->rb_nods_root);
 558         RB_INIT(&hmp->rb_undo_root);
 559         RB_INIT(&hmp->rb_resv_root);
 560         RB_INIT(&hmp->rb_bufs_root);
 561         RB_INIT(&hmp->rb_pfsm_root);
 562
 563         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 564
 565         RB_INIT(&hmp->volu_root);
 566         RB_INIT(&hmp->undo_root);
 567         RB_INIT(&hmp->data_root);
 568         RB_INIT(&hmp->meta_root);
 569         RB_INIT(&hmp->lose_root);
 570         TAILQ_INIT(&hmp->iorun_list);
 571
 572         lwkt_token_init(&hmp->fs_token, "hammerfs");
 573         lwkt_token_init(&hmp->io_token, "hammerio");
 574
 575         lwkt_gettoken(&hmp->fs_token);
 576
 577         /*
 578          * Load volumes
 579          */
 580         path = objcache_get(namei_oc, M_WAITOK);
 581         hmp->nvolumes = -1;
 582         for (i = 0; i < info.nvolumes; ++i) {
 583                 if (mntpt == NULL) {
 584                         /*
 585                          * Root mount.
 586                          */
 587                         KKASSERT(next_volume_ptr != NULL);
 588                         strcpy(path, "");
 589                         if (*next_volume_ptr != '/') {
 590                                 /* relative path */
 591                                 strcpy(path, "/dev/");
 592                         }
 593                         int k;
 594                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 595                                 if (*next_volume_ptr == '\0') {
 596                                         break;
 597                                 } else if (*next_volume_ptr == ':') {
 598                                         ++next_volume_ptr;
 599                                         break;
 600                                 } else {
 601                                         path[k] = *next_volume_ptr;
 602                                         ++next_volume_ptr;
 603                                 }
 604                         }
 605                         path[k] = '\0';
 606
 607                         error = 0;
 608                         cdev_t dev = kgetdiskbyname(path);
 609                         error = bdevvp(dev, &devvp);
 610                         if (error) {
 611                                 kprintf("hammer_mountroot: can't find devvp\n");
 612                         }
 613                 } else {
 614                         error = copyin(&info.volumes[i], &upath,
 615                                        sizeof(char *));
 616                         if (error == 0)
 617                                 error = copyinstr(upath, path,
 618                                                   MAXPATHLEN, NULL);
 619                 }
 620                 if (error == 0)
 621                         error = hammer_install_volume(hmp, path, devvp);
 622                 if (error)
 623                         break;
 624         }
 625         objcache_put(namei_oc, path);
 626
 627         /*
 628          * Make sure we found a root volume
 629          */
 630         if (error == 0 && hmp->rootvol == NULL) {
 631                 kprintf("hammer_mount: No root volume found!\n");
 632                 error = EINVAL;
 633         }
 634
 635         /*
 636          * Check that all required volumes are available
 637          */
 638         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 639                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 640                 error = EINVAL;
 641         }
 642
 643         if (error) {
 644                 /* called with fs_token held */
 645                 hammer_free_hmp(mp);
 646                 return (error);
 647         }
 648
 649         /*
 650          * No errors, setup enough of the mount point so we can lookup the
 651          * root vnode.
 652          */
 653         mp->mnt_iosize_max = MAXPHYS;
 654         mp->mnt_kern_flag |= MNTK_FSMID;
 655
 656         /*
 657          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 658          * will acquire a per-mount token prior to entry and release it
 659          * on return, so even if we do not specify it we no longer get
 660          * the BGL regardlless of how we are flagged.
 661          */
 662         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 663         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
 664
 665         /*
 666          * note: f_iosize is used by vnode_pager_haspage() when constructing
 667          * its VOP_BMAP call.
 668          */
 669         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 670         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 671
 672         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 673         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 674
 675         mp->mnt_maxsymlinklen = 255;
 676         mp->mnt_flag |= MNT_LOCAL;
 677
 678         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 679         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 680         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 681
 682         /*
 683          * The root volume's ondisk pointer is only valid if we hold a
 684          * reference to it.
 685          */
 686         rootvol = hammer_get_root_volume(hmp, &error);
 687         if (error)
 688                 goto failed;
 689
 690         /*
 691          * Perform any necessary UNDO operations.  The recovery code does
 692          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 693          * and then re-copy it again after recovery is complete.
 694          *
 695          * If this is a read-only mount the UNDO information is retained
 696          * in memory in the form of dirty buffer cache buffers, and not
 697          * written back to the media.
 698          */
 699         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 700               sizeof(hmp->blockmap));
 701
 702         /*
 703          * Check filesystem version
 704          */
 705         hmp->version = rootvol->ondisk->vol_version;
 706         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 707             hmp->version > HAMMER_VOL_VERSION_MAX) {
 708                 kprintf("HAMMER: mount unsupported fs version %d\n",
 709                         hmp->version);
 710                 error = ERANGE;
 711                 goto done;
 712         }
 713
 714         /*
 715          * The undo_rec_limit limits the size of flush groups to avoid
 716          * blowing out the UNDO FIFO.  This calculation is typically in
 717          * the tens of thousands and is designed primarily when small
 718          * HAMMER filesystems are created.
 719          */
 720         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 721         if (hammer_debug_general & 0x0001)
 722                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 723
 724         /*
 725          * NOTE: Recover stage1 not only handles meta-data recovery, it
 726          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 727          */
 728         error = hammer_recover_stage1(hmp, rootvol);
 729         if (error) {
 730                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 731                 goto done;
 732         }
 733
 734         /*
 735          * Finish setup now that we have a good root volume.
 736          *
 737          * The top 16 bits of fsid.val[1] is a pfs id.
 738          */
 739         ksnprintf(mp->mnt_stat.f_mntfromname,
 740                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 741                   rootvol->ondisk->vol_name);
 742         mp->mnt_stat.f_fsid.val[0] =
 743                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 744         mp->mnt_stat.f_fsid.val[1] =
 745                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 746         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 747
 748         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 749         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 750                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 751
 752         /*
 753          * Certain often-modified fields in the root volume are cached in
 754          * the hammer_mount structure so we do not have to generate lots
 755          * of little UNDO structures for them.
 756          *
 757          * Recopy after recovery.  This also has the side effect of
 758          * setting our cached undo FIFO's first_offset, which serves to
 759          * placemark the FIFO start for the NEXT flush cycle while the
 760          * on-disk first_offset represents the LAST flush cycle.
 761          */
 762         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 763         hmp->flush_tid1 = hmp->next_tid;
 764         hmp->flush_tid2 = hmp->next_tid;
 765         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 766               sizeof(hmp->blockmap));
 767         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 768
 769         hammer_flusher_create(hmp);
 770
 771         /*
 772          * Locate the root directory using the root cluster's B-Tree as a
 773          * starting point.  The root directory uses an obj_id of 1.
 774          *
 775          * FUTURE: Leave the root directory cached referenced but unlocked
 776          * in hmp->rootvp (need to flush it on unmount).
 777          */
 778         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 779         if (error)
 780                 goto done;
 781         vput(rootvp);
 782         /*vn_unlock(hmp->rootvp);*/
 783         if (hmp->ronly == 0)
 784                 error = hammer_recover_stage2(hmp, rootvol);
 785
 786         /*
 787          * If the stage2 recovery fails be sure to clean out all cached
 788          * vnodes before throwing away the mount structure or bad things
 789          * will happen.
 790          */
 791         if (error)
 792                 vflush(mp, 0, 0);
 793
 794 done:
 795         hammer_rel_volume(rootvol, 0);
 796 failed:
 797         /*
 798          * Cleanup and return.
 799          */
 800         if (error) {
 801                 /* called with fs_token held */
 802                 hammer_free_hmp(mp);
 803         } else {
 804                 lwkt_reltoken(&hmp->fs_token);
 805         }
 806         return (error);
 807 }
 808
 809 static int
 810 hammer_vfs_unmount(struct mount *mp, int mntflags)
 811 {
 812         hammer_mount_t hmp = (void *)mp->mnt_data;
 813         int flags;
 814         int error;
 815
 816         /*
 817          * Clean out the vnodes
 818          */
 819         lwkt_gettoken(&hmp->fs_token);
 820         flags = 0;
 821         if (mntflags & MNT_FORCE)
 822                 flags |= FORCECLOSE;
 823         error = vflush(mp, 0, flags);
 824
 825         /*
 826          * Clean up the internal mount structure and related entities.  This
 827          * may issue I/O.
 828          */
 829         if (error == 0) {
 830                 /* called with fs_token held */
 831                 hammer_free_hmp(mp);
 832         } else {
 833                 lwkt_reltoken(&hmp->fs_token);
 834         }
 835         return(error);
 836 }
 837
 838 /*
 839  * Clean up the internal mount structure and disassociate it from the mount.
 840  * This may issue I/O.
 841  *
 842  * Called with fs_token held.
 843  */
 844 static void
 845 hammer_free_hmp(struct mount *mp)
 846 {
 847         hammer_mount_t hmp = (void *)mp->mnt_data;
 848         hammer_flush_group_t flg;
 849         int count;
 850         int dummy;
 851
 852         /*
 853          * Flush anything dirty.  This won't even run if the
 854          * filesystem errored-out.
 855          */
 856         count = 0;
 857         while (hammer_flusher_haswork(hmp)) {
 858                 hammer_flusher_sync(hmp);
 859                 ++count;
 860                 if (count >= 5) {
 861                         if (count == 5)
 862                                 kprintf("HAMMER: umount flushing.");
 863                         else
 864                                 kprintf(".");
 865                         tsleep(&dummy, 0, "hmrufl", hz);
 866                 }
 867                 if (count == 30) {
 868                         kprintf("giving up\n");
 869                         break;
 870                 }
 871         }
 872         if (count >= 5 && count < 30)
 873                 kprintf("\n");
 874
 875         /*
 876          * If the mount had a critical error we have to destroy any
 877          * remaining inodes before we can finish cleaning up the flusher.
 878          */
 879         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 880                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 881                         hammer_destroy_inode_callback, NULL);
 882         }
 883
 884         /*
 885          * There shouldn't be any inodes left now and any left over
 886          * flush groups should now be empty.
 887          */
 888         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 889         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 890                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 891                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 892                 if (flg->refs) {
 893                         kprintf("HAMMER: Warning, flush_group %p was "
 894                                 "not empty on umount!\n", flg);
 895                 }
 896                 kfree(flg, hmp->m_misc);
 897         }
 898
 899         /*
 900          * We can finally destroy the flusher
 901          */
 902         hammer_flusher_destroy(hmp);
 903
 904         /*
 905          * We may have held recovered buffers due to a read-only mount.
 906          * These must be discarded.
 907          */
 908         if (hmp->ronly)
 909                 hammer_recover_flush_buffers(hmp, NULL, -1);
 910
 911         /*
 912          * Unload buffers and then volumes
 913          */
 914         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 915                 hammer_unload_buffer, NULL);
 916         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 917                 hammer_unload_volume, NULL);
 918
 919         mp->mnt_data = NULL;
 920         mp->mnt_flag &= ~MNT_LOCAL;
 921         hmp->mp = NULL;
 922         hammer_destroy_objid_cache(hmp);
 923         hammer_destroy_dedup_cache(hmp);
 924         if (hmp->dedup_free_cache != NULL) {
 925                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 926                 hmp->dedup_free_cache = NULL;
 927         }
 928         kmalloc_destroy(&hmp->m_misc);
 929         kmalloc_destroy(&hmp->m_inodes);
 930         lwkt_reltoken(&hmp->fs_token);
 931         kfree(hmp, M_HAMMER);
 932 }
 933
 934 /*
 935  * Report critical errors.  ip may be NULL.
 936  */
 937 void
 938 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 939                       int error, const char *msg)
 940 {
 941         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 942
 943         krateprintf(&hmp->krate,
 944                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 945                     hmp->mp->mnt_stat.f_mntfromname,
 946                     (intmax_t)(ip ? ip->obj_id : -1),
 947                     error, msg);
 948
 949         if (hmp->ronly == 0) {
 950                 hmp->ronly = 2;         /* special errored read-only mode */
 951                 hmp->mp->mnt_flag |= MNT_RDONLY;
 952                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 953                         hammer_adjust_volume_mode, NULL);
 954                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 955                         hmp->mp->mnt_stat.f_mntfromname);
 956         }
 957         hmp->error = error;
 958         if (hammer_debug_critical)
 959                 Debugger("Entering debugger");
 960 }
 961
 962
 963 /*
 964  * Obtain a vnode for the specified inode number.  An exclusively locked
 965  * vnode is returned.
 966  */
 967 int
 968 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 969                 ino_t ino, struct vnode **vpp)
 970 {
 971         struct hammer_transaction trans;
 972         struct hammer_mount *hmp = (void *)mp->mnt_data;
 973         struct hammer_inode *ip;
 974         int error;
 975         u_int32_t localization;
 976
 977         lwkt_gettoken(&hmp->fs_token);
 978         hammer_simple_transaction(&trans, hmp);
 979
 980         /*
 981          * If a directory vnode is supplied (mainly NFS) then we can acquire
 982          * the PFS domain from it.  Otherwise we would only be able to vget
 983          * inodes in the root PFS.
 984          */
 985         if (dvp) {
 986                 localization = HAMMER_DEF_LOCALIZATION +
 987                                 VTOI(dvp)->obj_localization;
 988         } else {
 989                 localization = HAMMER_DEF_LOCALIZATION;
 990         }
 991
 992         /*
 993          * Lookup the requested HAMMER inode.  The structure must be
 994          * left unlocked while we manipulate the related vnode to avoid
 995          * a deadlock.
 996          */
 997         ip = hammer_get_inode(&trans, NULL, ino,
 998                               hmp->asof, localization,
 999                               0, &error);
1000         if (ip == NULL) {
1001                 *vpp = NULL;
1002         } else {
1003                 error = hammer_get_vnode(ip, vpp);
1004                 hammer_rel_inode(ip, 0);
1005         }
1006         hammer_done_transaction(&trans);
1007         lwkt_reltoken(&hmp->fs_token);
1008         return (error);
1009 }
1010
1011 /*
1012  * Return the root vnode for the filesystem.
1013  *
1014  * HAMMER stores the root vnode in the hammer_mount structure so
1015  * getting it is easy.
1016  */
1017 static int
1018 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1019 {
1020         int error;
1021
1022         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1023         return (error);
1024 }
1025
1026 static int
1027 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1028 {
1029         struct hammer_mount *hmp = (void *)mp->mnt_data;
1030         hammer_volume_t volume;
1031         hammer_volume_ondisk_t ondisk;
1032         int error;
1033         int64_t bfree;
1034         int64_t breserved;
1035
1036         lwkt_gettoken(&hmp->fs_token);
1037         volume = hammer_get_root_volume(hmp, &error);
1038         if (error) {
1039                 lwkt_reltoken(&hmp->fs_token);
1040                 return(error);
1041         }
1042         ondisk = volume->ondisk;
1043
1044         /*
1045          * Basic stats
1046          */
1047         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1048         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1049         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1050         hammer_rel_volume(volume, 0);
1051
1052         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1053         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1054         if (mp->mnt_stat.f_files < 0)
1055                 mp->mnt_stat.f_files = 0;
1056
1057         *sbp = mp->mnt_stat;
1058         lwkt_reltoken(&hmp->fs_token);
1059         return(0);
1060 }
1061
1062 static int
1063 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1064 {
1065         struct hammer_mount *hmp = (void *)mp->mnt_data;
1066         hammer_volume_t volume;
1067         hammer_volume_ondisk_t ondisk;
1068         int error;
1069         int64_t bfree;
1070         int64_t breserved;
1071
1072         lwkt_gettoken(&hmp->fs_token);
1073         volume = hammer_get_root_volume(hmp, &error);
1074         if (error) {
1075                 lwkt_reltoken(&hmp->fs_token);
1076                 return(error);
1077         }
1078         ondisk = volume->ondisk;
1079
1080         /*
1081          * Basic stats
1082          */
1083         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1084         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1085         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1086         hammer_rel_volume(volume, 0);
1087
1088         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1089         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1090         if (mp->mnt_vstat.f_files < 0)
1091                 mp->mnt_vstat.f_files = 0;
1092         *sbp = mp->mnt_vstat;
1093         lwkt_reltoken(&hmp->fs_token);
1094         return(0);
1095 }
1096
1097 /*
1098  * Sync the filesystem.  Currently we have to run it twice, the second
1099  * one will advance the undo start index to the end index, so if a crash
1100  * occurs no undos will be run on mount.
1101  *
1102  * We do not sync the filesystem if we are called from a panic.  If we did
1103  * we might end up blowing up a sync that was already in progress.
1104  */
1105 static int
1106 hammer_vfs_sync(struct mount *mp, int waitfor)
1107 {
1108         struct hammer_mount *hmp = (void *)mp->mnt_data;
1109         int error;
1110
1111         lwkt_gettoken(&hmp->fs_token);
1112         if (panicstr == NULL) {
1113                 error = hammer_sync_hmp(hmp, waitfor);
1114         } else {
1115                 error = EIO;
1116         }
1117         lwkt_reltoken(&hmp->fs_token);
1118         return (error);
1119 }
1120
1121 /*
1122  * Convert a vnode to a file handle.
1123  *
1124  * Accesses read-only fields on already-referenced structures so
1125  * no token is needed.
1126  */
1127 static int
1128 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1129 {
1130         hammer_inode_t ip;
1131
1132         KKASSERT(MAXFIDSZ >= 16);
1133         ip = VTOI(vp);
1134         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1135         fhp->fid_ext = ip->obj_localization >> 16;
1136         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1137         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1138         return(0);
1139 }
1140
1141
1142 /*
1143  * Convert a file handle back to a vnode.
1144  *
1145  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1146  * null mount.
1147  */
1148 static int
1149 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1150                   struct fid *fhp, struct vnode **vpp)
1151 {
1152         hammer_mount_t hmp = (void *)mp->mnt_data;
1153         struct hammer_transaction trans;
1154         struct hammer_inode *ip;
1155         struct hammer_inode_info info;
1156         int error;
1157         u_int32_t localization;
1158
1159         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1160         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1161         if (rootvp)
1162                 localization = VTOI(rootvp)->obj_localization;
1163         else
1164                 localization = (u_int32_t)fhp->fid_ext << 16;
1165
1166         lwkt_gettoken(&hmp->fs_token);
1167         hammer_simple_transaction(&trans, hmp);
1168
1169         /*
1170          * Get/allocate the hammer_inode structure.  The structure must be
1171          * unlocked while we manipulate the related vnode to avoid a
1172          * deadlock.
1173          */
1174         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1175                               info.obj_asof, localization, 0, &error);
1176         if (ip) {
1177                 error = hammer_get_vnode(ip, vpp);
1178                 hammer_rel_inode(ip, 0);
1179         } else {
1180                 *vpp = NULL;
1181         }
1182         hammer_done_transaction(&trans);
1183         lwkt_reltoken(&hmp->fs_token);
1184         return (error);
1185 }
1186
1187 static int
1188 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1189                     int *exflagsp, struct ucred **credanonp)
1190 {
1191         hammer_mount_t hmp = (void *)mp->mnt_data;
1192         struct netcred *np;
1193         int error;
1194
1195         lwkt_gettoken(&hmp->fs_token);
1196         np = vfs_export_lookup(mp, &hmp->export, nam);
1197         if (np) {
1198                 *exflagsp = np->netc_exflags;
1199                 *credanonp = &np->netc_anon;
1200                 error = 0;
1201         } else {
1202                 error = EACCES;
1203         }
1204         lwkt_reltoken(&hmp->fs_token);
1205         return (error);
1206
1207 }
1208
1209 int
1210 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1211 {
1212         hammer_mount_t hmp = (void *)mp->mnt_data;
1213         int error;
1214
1215         lwkt_gettoken(&hmp->fs_token);
1216
1217         switch(op) {
1218         case MOUNTCTL_SET_EXPORT:
1219                 error = vfs_export(mp, &hmp->export, export);
1220                 break;
1221         default:
1222                 error = EOPNOTSUPP;
1223                 break;
1224         }
1225         lwkt_reltoken(&hmp->fs_token);
1226
1227         return(error);
1228 }
1229