sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42 #include <sys/malloc.h>
  43 #include <sys/nlookup.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/buf.h>
  47 #include <sys/buf2.h>
  48 #include "hammer.h"
  49
  50 /*
  51  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  52  *        in conditionals.
  53  */
  54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  55 int hammer_debug_io;
  56 int hammer_debug_general;
  57 int hammer_debug_debug = 1;             /* medium-error panics */
  58 int hammer_debug_inode;
  59 int hammer_debug_locks;
  60 int hammer_debug_btree;
  61 int hammer_debug_tid;
  62 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  63 int hammer_debug_recover_faults;
  64 int hammer_debug_critical;              /* non-zero enter debugger on error */
  65 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  66 int hammer_live_dedup = 0;
  67 int hammer_count_fsyncs;
  68 int hammer_count_inodes;
  69 int hammer_count_iqueued;
  70 int hammer_count_reclaiming;
  71 int hammer_count_records;
  72 int hammer_count_record_datas;
  73 int hammer_count_volumes;
  74 int hammer_count_buffers;
  75 int hammer_count_nodes;
  76 int64_t hammer_count_extra_space_used;
  77 int64_t hammer_stats_btree_lookups;
  78 int64_t hammer_stats_btree_searches;
  79 int64_t hammer_stats_btree_inserts;
  80 int64_t hammer_stats_btree_deletes;
  81 int64_t hammer_stats_btree_elements;
  82 int64_t hammer_stats_btree_splits;
  83 int64_t hammer_stats_btree_iterations;
  84 int64_t hammer_stats_btree_root_iterations;
  85 int64_t hammer_stats_record_iterations;
  86
  87 int64_t hammer_stats_file_read;
  88 int64_t hammer_stats_file_write;
  89 int64_t hammer_stats_file_iopsr;
  90 int64_t hammer_stats_file_iopsw;
  91 int64_t hammer_stats_disk_read;
  92 int64_t hammer_stats_disk_write;
  93 int64_t hammer_stats_inode_flushes;
  94 int64_t hammer_stats_commits;
  95 int64_t hammer_stats_undo;
  96 int64_t hammer_stats_redo;
  97
  98 int hammer_count_dirtybufspace;         /* global */
  99 int hammer_count_refedbufs;             /* global */
 100 int hammer_count_reservations;
 101 int hammer_count_io_running_read;
 102 int hammer_count_io_running_write;
 103 int hammer_count_io_locked;
 104 int hammer_limit_dirtybufspace;         /* per-mount */
 105 int hammer_limit_running_io;            /* per-mount */
 106 int hammer_limit_recs;                  /* as a whole XXX */
 107 int hammer_limit_inode_recs = 1024;     /* per inode */
 108 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
 109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
 110 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 111 int hammer_autoflush = 2000;            /* auto flush */
 112 int hammer_bio_count;
 113 int hammer_verify_zone;
 114 int hammer_verify_data = 1;
 115 int hammer_write_mode;
 116 int hammer_yield_check = 16;
 117 int hammer_fsync_mode = 3;
 118 int64_t hammer_contention_count;
 119 int64_t hammer_zone_limit;
 120
 121 /*
 122  * Live dedup debug counters (sysctls are writable so that counters
 123  * can be reset from userspace).
 124  */
 125 int64_t hammer_live_dedup_vnode_bcmps = 0;
 126 int64_t hammer_live_dedup_device_bcmps = 0;
 127 int64_t hammer_live_dedup_findblk_failures = 0;
 128 int64_t hammer_live_dedup_bmap_saves = 0;
 129
 130
 131 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 132
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 134            &hammer_supported_version, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 136            &hammer_debug_general, 0, "");
 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 138            &hammer_debug_io, 0, "");
 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 140            &hammer_debug_debug, 0, "");
 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 142            &hammer_debug_inode, 0, "");
 143 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 144            &hammer_debug_locks, 0, "");
 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 146            &hammer_debug_btree, 0, "");
 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 148            &hammer_debug_tid, 0, "");
 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 150            &hammer_debug_recover, 0, "");
 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 152            &hammer_debug_recover_faults, 0, "");
 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 154            &hammer_debug_critical, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 156            &hammer_cluster_enable, 0, "");
 157 /*
 158  * 0 - live dedup is disabled
 159  * 1 - dedup cache is populated on reads only
 160  * 2 - dedup cache is populated on both reads and writes
 161  */
 162 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
 163            &hammer_live_dedup, 0, "Enable live dedup");
 164
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 166            &hammer_limit_dirtybufspace, 0, "");
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
 168            &hammer_limit_running_io, 0, "");
 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 170            &hammer_limit_recs, 0, "");
 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 172            &hammer_limit_inode_recs, 0, "");
 173 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 174            &hammer_limit_reclaim, 0, "");
 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 176            &hammer_live_dedup_cache_size, 0, "");
 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_reclaiming, CTLFLAG_RD,
 187            &hammer_count_reclaiming, 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, yield_check, CTLFLAG_RW,
 279            &hammer_yield_check, 0, "");
 280 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 281            &hammer_fsync_mode, 0, "");
 282
 283 KTR_INFO_MASTER(hammer);
 284
 285 /*
 286  * VFS ABI
 287  */
 288 static void     hammer_free_hmp(struct mount *mp);
 289
 290 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 291                                 struct ucred *cred);
 292 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 293 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 294 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 295                                 struct ucred *cred);
 296 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 297                                 struct ucred *cred);
 298 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 299 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 300                                 ino_t ino, struct vnode **vpp);
 301 static int      hammer_vfs_init(struct vfsconf *conf);
 302 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 303                                 struct fid *fhp, struct vnode **vpp);
 304 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 305 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 306                                 int *exflagsp, struct ucred **credanonp);
 307
 308
 309 static struct vfsops hammer_vfsops = {
 310         .vfs_mount      = hammer_vfs_mount,
 311         .vfs_unmount    = hammer_vfs_unmount,
 312         .vfs_root       = hammer_vfs_root,
 313         .vfs_statfs     = hammer_vfs_statfs,
 314         .vfs_statvfs    = hammer_vfs_statvfs,
 315         .vfs_sync       = hammer_vfs_sync,
 316         .vfs_vget       = hammer_vfs_vget,
 317         .vfs_init       = hammer_vfs_init,
 318         .vfs_vptofh     = hammer_vfs_vptofh,
 319         .vfs_fhtovp     = hammer_vfs_fhtovp,
 320         .vfs_checkexp   = hammer_vfs_checkexp
 321 };
 322
 323 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 324
 325 VFS_SET(hammer_vfsops, hammer, 0);
 326 MODULE_VERSION(hammer, 1);
 327
 328 static int
 329 hammer_vfs_init(struct vfsconf *conf)
 330 {
 331         int n;
 332
 333         if (hammer_limit_recs == 0) {
 334                 hammer_limit_recs = nbuf * 25;
 335                 n = kmalloc_limit(M_HAMMER) / 512;
 336                 if (hammer_limit_recs > n)
 337                         hammer_limit_recs = n;
 338         }
 339         if (hammer_limit_dirtybufspace == 0) {
 340                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 341                 if (hammer_limit_dirtybufspace < 100)
 342                         hammer_limit_dirtybufspace = 100;
 343         }
 344
 345         /*
 346          * Set reasonable limits to maintain an I/O pipeline.  This is
 347          * used by the flush code which explicitly initiates I/O, and
 348          * is per-mount.
 349          *
 350          * The system-driven buffer cache uses vfs.lorunningspace and
 351          * vfs.hirunningspace globally.
 352          */
 353         if (hammer_limit_running_io == 0)
 354                 hammer_limit_running_io = hammer_limit_dirtybufspace;
 355         if (hammer_limit_running_io > 10 * 1024 * 1024)
 356                 hammer_limit_running_io = 10 * 1024 * 1024;
 357         return(0);
 358 }
 359
 360 static int
 361 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 362                  struct ucred *cred)
 363 {
 364         struct hammer_mount_info info;
 365         hammer_mount_t hmp;
 366         hammer_volume_t rootvol;
 367         struct vnode *rootvp;
 368         struct vnode *devvp = NULL;
 369         const char *upath;      /* volume name in userspace */
 370         char *path;             /* volume name in system space */
 371         int error;
 372         int i;
 373         int master_id;
 374         char *next_volume_ptr = NULL;
 375
 376         /*
 377          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 378          */
 379         if (mntpt == NULL) {
 380                 bzero(&info, sizeof(info));
 381                 info.asof = 0;
 382                 info.hflags = 0;
 383                 info.nvolumes = 1;
 384
 385                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 386
 387                 /* Count number of volumes separated by ':' */
 388                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 389                         if (*p == ':') {
 390                                 ++info.nvolumes;
 391                         }
 392                 }
 393
 394                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 395         } else {
 396                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 397                         return (error);
 398         }
 399
 400         /*
 401          * updating or new mount
 402          */
 403         if (mp->mnt_flag & MNT_UPDATE) {
 404                 hmp = (void *)mp->mnt_data;
 405                 KKASSERT(hmp != NULL);
 406         } else {
 407                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 408                         return (EINVAL);
 409                 hmp = NULL;
 410         }
 411
 412         /*
 413          * master-id validation.  The master id may not be changed by a
 414          * mount update.
 415          */
 416         if (info.hflags & HMNT_MASTERID) {
 417                 if (hmp && hmp->master_id != info.master_id) {
 418                         kprintf("hammer: cannot change master id "
 419                                 "with mount update\n");
 420                         return(EINVAL);
 421                 }
 422                 master_id = info.master_id;
 423                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 424                         return (EINVAL);
 425         } else {
 426                 if (hmp)
 427                         master_id = hmp->master_id;
 428                 else
 429                         master_id = 0;
 430         }
 431
 432         /*
 433          * Internal mount data structure
 434          */
 435         if (hmp == NULL) {
 436                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 437                 mp->mnt_data = (qaddr_t)hmp;
 438                 hmp->mp = mp;
 439                 /*TAILQ_INIT(&hmp->recycle_list);*/
 440
 441                 /*
 442                  * Make sure kmalloc type limits are set appropriately.
 443                  *
 444                  * Our inode kmalloc group is sized based on maxvnodes
 445                  * (controlled by the system, not us).
 446                  */
 447                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 448                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 449
 450                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 451
 452                 hmp->root_btree_beg.localization = 0x00000000U;
 453                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 454                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 455                 hmp->root_btree_beg.create_tid = 1;
 456                 hmp->root_btree_beg.delete_tid = 1;
 457                 hmp->root_btree_beg.rec_type = 0;
 458                 hmp->root_btree_beg.obj_type = 0;
 459
 460                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 461                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 462                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 463                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 464                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 465                 hmp->root_btree_end.rec_type = 0xFFFFU;
 466                 hmp->root_btree_end.obj_type = 0;
 467
 468                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 469                 hmp->krate.count = -16; /* initial burst */
 470
 471                 hmp->sync_lock.refs = 1;
 472                 hmp->free_lock.refs = 1;
 473                 hmp->undo_lock.refs = 1;
 474                 hmp->blkmap_lock.refs = 1;
 475                 hmp->snapshot_lock.refs = 1;
 476                 hmp->volume_lock.refs = 1;
 477
 478                 TAILQ_INIT(&hmp->delay_list);
 479                 TAILQ_INIT(&hmp->flush_group_list);
 480                 TAILQ_INIT(&hmp->objid_cache_list);
 481                 TAILQ_INIT(&hmp->undo_lru_list);
 482                 TAILQ_INIT(&hmp->reclaim_list);
 483
 484                 RB_INIT(&hmp->rb_dedup_crc_root);
 485                 RB_INIT(&hmp->rb_dedup_off_root);
 486                 TAILQ_INIT(&hmp->dedup_lru_list);
 487         }
 488         hmp->hflags &= ~HMNT_USERFLAGS;
 489         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 490
 491         hmp->master_id = master_id;
 492
 493         if (info.asof) {
 494                 mp->mnt_flag |= MNT_RDONLY;
 495                 hmp->asof = info.asof;
 496         } else {
 497                 hmp->asof = HAMMER_MAX_TID;
 498         }
 499
 500         hmp->volume_to_remove = -1;
 501
 502         /*
 503          * Re-open read-write if originally read-only, or vise-versa.
 504          *
 505          * When going from read-only to read-write execute the stage2
 506          * recovery if it has not already been run.
 507          */
 508         if (mp->mnt_flag & MNT_UPDATE) {
 509                 lwkt_gettoken(&hmp->fs_token);
 510                 error = 0;
 511                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 512                         kprintf("HAMMER read-only -> read-write\n");
 513                         hmp->ronly = 0;
 514                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 515                                 hammer_adjust_volume_mode, NULL);
 516                         rootvol = hammer_get_root_volume(hmp, &error);
 517                         if (rootvol) {
 518                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 519                                 error = hammer_recover_stage2(hmp, rootvol);
 520                                 bcopy(rootvol->ondisk->vol0_blockmap,
 521                                       hmp->blockmap,
 522                                       sizeof(hmp->blockmap));
 523                                 hammer_rel_volume(rootvol, 0);
 524                         }
 525                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 526                                 hammer_reload_inode, NULL);
 527                         /* kernel clears MNT_RDONLY */
 528                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 529                         kprintf("HAMMER read-write -> read-only\n");
 530                         hmp->ronly = 1; /* messy */
 531                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 532                                 hammer_reload_inode, NULL);
 533                         hmp->ronly = 0;
 534                         hammer_flusher_sync(hmp);
 535                         hammer_flusher_sync(hmp);
 536                         hammer_flusher_sync(hmp);
 537                         hmp->ronly = 1;
 538                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 539                                 hammer_adjust_volume_mode, NULL);
 540                 }
 541                 lwkt_reltoken(&hmp->fs_token);
 542                 return(error);
 543         }
 544
 545         RB_INIT(&hmp->rb_vols_root);
 546         RB_INIT(&hmp->rb_inos_root);
 547         RB_INIT(&hmp->rb_redo_root);
 548         RB_INIT(&hmp->rb_nods_root);
 549         RB_INIT(&hmp->rb_undo_root);
 550         RB_INIT(&hmp->rb_resv_root);
 551         RB_INIT(&hmp->rb_bufs_root);
 552         RB_INIT(&hmp->rb_pfsm_root);
 553
 554         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 555
 556         TAILQ_INIT(&hmp->volu_list);
 557         TAILQ_INIT(&hmp->undo_list);
 558         TAILQ_INIT(&hmp->data_list);
 559         TAILQ_INIT(&hmp->meta_list);
 560         TAILQ_INIT(&hmp->lose_list);
 561         TAILQ_INIT(&hmp->iorun_list);
 562
 563         lwkt_token_init(&hmp->fs_token, 1, "hammerfs");
 564         lwkt_token_init(&hmp->io_token, 1, "hammerio");
 565
 566         lwkt_gettoken(&hmp->fs_token);
 567
 568         /*
 569          * Load volumes
 570          */
 571         path = objcache_get(namei_oc, M_WAITOK);
 572         hmp->nvolumes = -1;
 573         for (i = 0; i < info.nvolumes; ++i) {
 574                 if (mntpt == NULL) {
 575                         /*
 576                          * Root mount.
 577                          */
 578                         KKASSERT(next_volume_ptr != NULL);
 579                         strcpy(path, "");
 580                         if (*next_volume_ptr != '/') {
 581                                 /* relative path */
 582                                 strcpy(path, "/dev/");
 583                         }
 584                         int k;
 585                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 586                                 if (*next_volume_ptr == '\0') {
 587                                         break;
 588                                 } else if (*next_volume_ptr == ':') {
 589                                         ++next_volume_ptr;
 590                                         break;
 591                                 } else {
 592                                         path[k] = *next_volume_ptr;
 593                                         ++next_volume_ptr;
 594                                 }
 595                         }
 596                         path[k] = '\0';
 597
 598                         error = 0;
 599                         cdev_t dev = kgetdiskbyname(path);
 600                         error = bdevvp(dev, &devvp);
 601                         if (error) {
 602                                 kprintf("hammer_mountroot: can't find devvp\n");
 603                         }
 604                 } else {
 605                         error = copyin(&info.volumes[i], &upath,
 606                                        sizeof(char *));
 607                         if (error == 0)
 608                                 error = copyinstr(upath, path,
 609                                                   MAXPATHLEN, NULL);
 610                 }
 611                 if (error == 0)
 612                         error = hammer_install_volume(hmp, path, devvp);
 613                 if (error)
 614                         break;
 615         }
 616         objcache_put(namei_oc, path);
 617
 618         /*
 619          * Make sure we found a root volume
 620          */
 621         if (error == 0 && hmp->rootvol == NULL) {
 622                 kprintf("hammer_mount: No root volume found!\n");
 623                 error = EINVAL;
 624         }
 625
 626         /*
 627          * Check that all required volumes are available
 628          */
 629         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 630                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 631                 error = EINVAL;
 632         }
 633
 634         if (error) {
 635                 /* called with fs_token held */
 636                 hammer_free_hmp(mp);
 637                 return (error);
 638         }
 639
 640         /*
 641          * No errors, setup enough of the mount point so we can lookup the
 642          * root vnode.
 643          */
 644         mp->mnt_iosize_max = MAXPHYS;
 645         mp->mnt_kern_flag |= MNTK_FSMID;
 646
 647         /*
 648          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 649          * will acquire a per-mount token prior to entry and release it
 650          * on return, so even if we do not specify it we no longer get
 651          * the BGL regardlless of how we are flagged.
 652          */
 653         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 654         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
 655
 656         /*
 657          * note: f_iosize is used by vnode_pager_haspage() when constructing
 658          * its VOP_BMAP call.
 659          */
 660         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 661         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 662
 663         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 664         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 665
 666         mp->mnt_maxsymlinklen = 255;
 667         mp->mnt_flag |= MNT_LOCAL;
 668
 669         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 670         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 671         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 672
 673         /*
 674          * The root volume's ondisk pointer is only valid if we hold a
 675          * reference to it.
 676          */
 677         rootvol = hammer_get_root_volume(hmp, &error);
 678         if (error)
 679                 goto failed;
 680
 681         /*
 682          * Perform any necessary UNDO operations.  The recovery code does
 683          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 684          * and then re-copy it again after recovery is complete.
 685          *
 686          * If this is a read-only mount the UNDO information is retained
 687          * in memory in the form of dirty buffer cache buffers, and not
 688          * written back to the media.
 689          */
 690         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 691               sizeof(hmp->blockmap));
 692
 693         /*
 694          * Check filesystem version
 695          */
 696         hmp->version = rootvol->ondisk->vol_version;
 697         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 698             hmp->version > HAMMER_VOL_VERSION_MAX) {
 699                 kprintf("HAMMER: mount unsupported fs version %d\n",
 700                         hmp->version);
 701                 error = ERANGE;
 702                 goto done;
 703         }
 704
 705         /*
 706          * The undo_rec_limit limits the size of flush groups to avoid
 707          * blowing out the UNDO FIFO.  This calculation is typically in
 708          * the tens of thousands and is designed primarily when small
 709          * HAMMER filesystems are created.
 710          */
 711         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 712         if (hammer_debug_general & 0x0001)
 713                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 714
 715         /*
 716          * NOTE: Recover stage1 not only handles meta-data recovery, it
 717          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 718          */
 719         error = hammer_recover_stage1(hmp, rootvol);
 720         if (error) {
 721                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 722                 goto done;
 723         }
 724
 725         /*
 726          * Finish setup now that we have a good root volume.
 727          *
 728          * The top 16 bits of fsid.val[1] is a pfs id.
 729          */
 730         ksnprintf(mp->mnt_stat.f_mntfromname,
 731                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 732                   rootvol->ondisk->vol_name);
 733         mp->mnt_stat.f_fsid.val[0] =
 734                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 735         mp->mnt_stat.f_fsid.val[1] =
 736                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 737         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 738
 739         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 740         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 741                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 742
 743         /*
 744          * Certain often-modified fields in the root volume are cached in
 745          * the hammer_mount structure so we do not have to generate lots
 746          * of little UNDO structures for them.
 747          *
 748          * Recopy after recovery.  This also has the side effect of
 749          * setting our cached undo FIFO's first_offset, which serves to
 750          * placemark the FIFO start for the NEXT flush cycle while the
 751          * on-disk first_offset represents the LAST flush cycle.
 752          */
 753         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 754         hmp->flush_tid1 = hmp->next_tid;
 755         hmp->flush_tid2 = hmp->next_tid;
 756         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 757               sizeof(hmp->blockmap));
 758         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 759
 760         hammer_flusher_create(hmp);
 761
 762         /*
 763          * Locate the root directory using the root cluster's B-Tree as a
 764          * starting point.  The root directory uses an obj_id of 1.
 765          *
 766          * FUTURE: Leave the root directory cached referenced but unlocked
 767          * in hmp->rootvp (need to flush it on unmount).
 768          */
 769         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 770         if (error)
 771                 goto done;
 772         vput(rootvp);
 773         /*vn_unlock(hmp->rootvp);*/
 774         if (hmp->ronly == 0)
 775                 error = hammer_recover_stage2(hmp, rootvol);
 776
 777         /*
 778          * If the stage2 recovery fails be sure to clean out all cached
 779          * vnodes before throwing away the mount structure or bad things
 780          * will happen.
 781          */
 782         if (error)
 783                 vflush(mp, 0, 0);
 784
 785 done:
 786         hammer_rel_volume(rootvol, 0);
 787 failed:
 788         /*
 789          * Cleanup and return.
 790          */
 791         if (error) {
 792                 /* called with fs_token held */
 793                 hammer_free_hmp(mp);
 794         } else {
 795                 lwkt_reltoken(&hmp->fs_token);
 796         }
 797         return (error);
 798 }
 799
 800 static int
 801 hammer_vfs_unmount(struct mount *mp, int mntflags)
 802 {
 803         hammer_mount_t hmp = (void *)mp->mnt_data;
 804         int flags;
 805         int error;
 806
 807         /*
 808          * Clean out the vnodes
 809          */
 810         lwkt_gettoken(&hmp->fs_token);
 811         flags = 0;
 812         if (mntflags & MNT_FORCE)
 813                 flags |= FORCECLOSE;
 814         error = vflush(mp, 0, flags);
 815
 816         /*
 817          * Clean up the internal mount structure and related entities.  This
 818          * may issue I/O.
 819          */
 820         if (error == 0) {
 821                 /* called with fs_token held */
 822                 hammer_free_hmp(mp);
 823         } else {
 824                 lwkt_reltoken(&hmp->fs_token);
 825         }
 826         return(error);
 827 }
 828
 829 /*
 830  * Clean up the internal mount structure and disassociate it from the mount.
 831  * This may issue I/O.
 832  *
 833  * Called with fs_token held.
 834  */
 835 static void
 836 hammer_free_hmp(struct mount *mp)
 837 {
 838         hammer_mount_t hmp = (void *)mp->mnt_data;
 839         hammer_flush_group_t flg;
 840         int count;
 841         int dummy;
 842
 843         /*
 844          * Flush anything dirty.  This won't even run if the
 845          * filesystem errored-out.
 846          */
 847         count = 0;
 848         while (hammer_flusher_haswork(hmp)) {
 849                 hammer_flusher_sync(hmp);
 850                 ++count;
 851                 if (count >= 5) {
 852                         if (count == 5)
 853                                 kprintf("HAMMER: umount flushing.");
 854                         else
 855                                 kprintf(".");
 856                         tsleep(&dummy, 0, "hmrufl", hz);
 857                 }
 858                 if (count == 30) {
 859                         kprintf("giving up\n");
 860                         break;
 861                 }
 862         }
 863         if (count >= 5 && count < 30)
 864                 kprintf("\n");
 865
 866         /*
 867          * If the mount had a critical error we have to destroy any
 868          * remaining inodes before we can finish cleaning up the flusher.
 869          */
 870         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 871                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 872                         hammer_destroy_inode_callback, NULL);
 873         }
 874
 875         /*
 876          * There shouldn't be any inodes left now and any left over
 877          * flush groups should now be empty.
 878          */
 879         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 880         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 881                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 882                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 883                 if (flg->refs) {
 884                         kprintf("HAMMER: Warning, flush_group %p was "
 885                                 "not empty on umount!\n", flg);
 886                 }
 887                 kfree(flg, hmp->m_misc);
 888         }
 889
 890         /*
 891          * We can finally destroy the flusher
 892          */
 893         hammer_flusher_destroy(hmp);
 894
 895         /*
 896          * We may have held recovered buffers due to a read-only mount.
 897          * These must be discarded.
 898          */
 899         if (hmp->ronly)
 900                 hammer_recover_flush_buffers(hmp, NULL, -1);
 901
 902         /*
 903          * Unload buffers and then volumes
 904          */
 905         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 906                 hammer_unload_buffer, NULL);
 907         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 908                 hammer_unload_volume, NULL);
 909
 910         mp->mnt_data = NULL;
 911         mp->mnt_flag &= ~MNT_LOCAL;
 912         hmp->mp = NULL;
 913         hammer_destroy_objid_cache(hmp);
 914         hammer_destroy_dedup_cache(hmp);
 915         if (hmp->dedup_free_cache != NULL) {
 916                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 917                 hmp->dedup_free_cache = NULL;
 918         }
 919         kmalloc_destroy(&hmp->m_misc);
 920         kmalloc_destroy(&hmp->m_inodes);
 921         lwkt_reltoken(&hmp->fs_token);
 922         kfree(hmp, M_HAMMER);
 923 }
 924
 925 /*
 926  * Report critical errors.  ip may be NULL.
 927  */
 928 void
 929 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 930                       int error, const char *msg)
 931 {
 932         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 933
 934         krateprintf(&hmp->krate,
 935                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 936                     hmp->mp->mnt_stat.f_mntfromname,
 937                     (intmax_t)(ip ? ip->obj_id : -1),
 938                     error, msg);
 939
 940         if (hmp->ronly == 0) {
 941                 hmp->ronly = 2;         /* special errored read-only mode */
 942                 hmp->mp->mnt_flag |= MNT_RDONLY;
 943                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 944                         hmp->mp->mnt_stat.f_mntfromname);
 945         }
 946         hmp->error = error;
 947         if (hammer_debug_critical)
 948                 Debugger("Entering debugger");
 949 }
 950
 951
 952 /*
 953  * Obtain a vnode for the specified inode number.  An exclusively locked
 954  * vnode is returned.
 955  */
 956 int
 957 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 958                 ino_t ino, struct vnode **vpp)
 959 {
 960         struct hammer_transaction trans;
 961         struct hammer_mount *hmp = (void *)mp->mnt_data;
 962         struct hammer_inode *ip;
 963         int error;
 964         u_int32_t localization;
 965
 966         lwkt_gettoken(&hmp->fs_token);
 967         hammer_simple_transaction(&trans, hmp);
 968
 969         /*
 970          * If a directory vnode is supplied (mainly NFS) then we can acquire
 971          * the PFS domain from it.  Otherwise we would only be able to vget
 972          * inodes in the root PFS.
 973          */
 974         if (dvp) {
 975                 localization = HAMMER_DEF_LOCALIZATION +
 976                                 VTOI(dvp)->obj_localization;
 977         } else {
 978                 localization = HAMMER_DEF_LOCALIZATION;
 979         }
 980
 981         /*
 982          * Lookup the requested HAMMER inode.  The structure must be
 983          * left unlocked while we manipulate the related vnode to avoid
 984          * a deadlock.
 985          */
 986         ip = hammer_get_inode(&trans, NULL, ino,
 987                               hmp->asof, localization,
 988                               0, &error);
 989         if (ip == NULL) {
 990                 *vpp = NULL;
 991         } else {
 992                 error = hammer_get_vnode(ip, vpp);
 993                 hammer_rel_inode(ip, 0);
 994         }
 995         hammer_done_transaction(&trans);
 996         lwkt_reltoken(&hmp->fs_token);
 997         return (error);
 998 }
 999
1000 /*
1001  * Return the root vnode for the filesystem.
1002  *
1003  * HAMMER stores the root vnode in the hammer_mount structure so
1004  * getting it is easy.
1005  */
1006 static int
1007 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1008 {
1009         int error;
1010
1011         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1012         return (error);
1013 }
1014
1015 static int
1016 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1017 {
1018         struct hammer_mount *hmp = (void *)mp->mnt_data;
1019         hammer_volume_t volume;
1020         hammer_volume_ondisk_t ondisk;
1021         int error;
1022         int64_t bfree;
1023         int64_t breserved;
1024
1025         lwkt_gettoken(&hmp->fs_token);
1026         volume = hammer_get_root_volume(hmp, &error);
1027         if (error) {
1028                 lwkt_reltoken(&hmp->fs_token);
1029                 return(error);
1030         }
1031         ondisk = volume->ondisk;
1032
1033         /*
1034          * Basic stats
1035          */
1036         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1037         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1038         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1039         hammer_rel_volume(volume, 0);
1040
1041         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1042         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1043         if (mp->mnt_stat.f_files < 0)
1044                 mp->mnt_stat.f_files = 0;
1045
1046         *sbp = mp->mnt_stat;
1047         lwkt_reltoken(&hmp->fs_token);
1048         return(0);
1049 }
1050
1051 static int
1052 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1053 {
1054         struct hammer_mount *hmp = (void *)mp->mnt_data;
1055         hammer_volume_t volume;
1056         hammer_volume_ondisk_t ondisk;
1057         int error;
1058         int64_t bfree;
1059         int64_t breserved;
1060
1061         lwkt_gettoken(&hmp->fs_token);
1062         volume = hammer_get_root_volume(hmp, &error);
1063         if (error) {
1064                 lwkt_reltoken(&hmp->fs_token);
1065                 return(error);
1066         }
1067         ondisk = volume->ondisk;
1068
1069         /*
1070          * Basic stats
1071          */
1072         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1073         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1074         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1075         hammer_rel_volume(volume, 0);
1076
1077         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1078         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1079         if (mp->mnt_vstat.f_files < 0)
1080                 mp->mnt_vstat.f_files = 0;
1081         *sbp = mp->mnt_vstat;
1082         lwkt_reltoken(&hmp->fs_token);
1083         return(0);
1084 }
1085
1086 /*
1087  * Sync the filesystem.  Currently we have to run it twice, the second
1088  * one will advance the undo start index to the end index, so if a crash
1089  * occurs no undos will be run on mount.
1090  *
1091  * We do not sync the filesystem if we are called from a panic.  If we did
1092  * we might end up blowing up a sync that was already in progress.
1093  */
1094 static int
1095 hammer_vfs_sync(struct mount *mp, int waitfor)
1096 {
1097         struct hammer_mount *hmp = (void *)mp->mnt_data;
1098         int error;
1099
1100         lwkt_gettoken(&hmp->fs_token);
1101         if (panicstr == NULL) {
1102                 error = hammer_sync_hmp(hmp, waitfor);
1103         } else {
1104                 error = EIO;
1105         }
1106         lwkt_reltoken(&hmp->fs_token);
1107         return (error);
1108 }
1109
1110 /*
1111  * Convert a vnode to a file handle.
1112  *
1113  * Accesses read-only fields on already-referenced structures so
1114  * no token is needed.
1115  */
1116 static int
1117 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1118 {
1119         hammer_inode_t ip;
1120
1121         KKASSERT(MAXFIDSZ >= 16);
1122         ip = VTOI(vp);
1123         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1124         fhp->fid_ext = ip->obj_localization >> 16;
1125         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1126         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1127         return(0);
1128 }
1129
1130
1131 /*
1132  * Convert a file handle back to a vnode.
1133  *
1134  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1135  * null mount.
1136  */
1137 static int
1138 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1139                   struct fid *fhp, struct vnode **vpp)
1140 {
1141         hammer_mount_t hmp = (void *)mp->mnt_data;
1142         struct hammer_transaction trans;
1143         struct hammer_inode *ip;
1144         struct hammer_inode_info info;
1145         int error;
1146         u_int32_t localization;
1147
1148         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1149         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1150         if (rootvp)
1151                 localization = VTOI(rootvp)->obj_localization;
1152         else
1153                 localization = (u_int32_t)fhp->fid_ext << 16;
1154
1155         lwkt_gettoken(&hmp->fs_token);
1156         hammer_simple_transaction(&trans, hmp);
1157
1158         /*
1159          * Get/allocate the hammer_inode structure.  The structure must be
1160          * unlocked while we manipulate the related vnode to avoid a
1161          * deadlock.
1162          */
1163         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1164                               info.obj_asof, localization, 0, &error);
1165         if (ip) {
1166                 error = hammer_get_vnode(ip, vpp);
1167                 hammer_rel_inode(ip, 0);
1168         } else {
1169                 *vpp = NULL;
1170         }
1171         hammer_done_transaction(&trans);
1172         lwkt_reltoken(&hmp->fs_token);
1173         return (error);
1174 }
1175
1176 static int
1177 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1178                     int *exflagsp, struct ucred **credanonp)
1179 {
1180         hammer_mount_t hmp = (void *)mp->mnt_data;
1181         struct netcred *np;
1182         int error;
1183
1184         lwkt_gettoken(&hmp->fs_token);
1185         np = vfs_export_lookup(mp, &hmp->export, nam);
1186         if (np) {
1187                 *exflagsp = np->netc_exflags;
1188                 *credanonp = &np->netc_anon;
1189                 error = 0;
1190         } else {
1191                 error = EACCES;
1192         }
1193         lwkt_reltoken(&hmp->fs_token);
1194         return (error);
1195
1196 }
1197
1198 int
1199 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1200 {
1201         hammer_mount_t hmp = (void *)mp->mnt_data;
1202         int error;
1203
1204         lwkt_gettoken(&hmp->fs_token);
1205
1206         switch(op) {
1207         case MOUNTCTL_SET_EXPORT:
1208                 error = vfs_export(mp, &hmp->export, export);
1209                 break;
1210         default:
1211                 error = EOPNOTSUPP;
1212                 break;
1213         }
1214         lwkt_reltoken(&hmp->fs_token);
1215
1216         return(error);
1217 }
1218