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/mountctl.h>
  36
  37 #include "hammer.h"
  38
  39 /*
  40  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  41  *        in conditionals.
  42  */
  43 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  44 int hammer_debug_io;
  45 int hammer_debug_general;
  46 int hammer_debug_inode;
  47 int hammer_debug_locks;
  48 int hammer_debug_btree;
  49 int hammer_debug_tid;
  50 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  51 int hammer_debug_critical;              /* non-zero enter debugger on error */
  52 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  53 int hammer_live_dedup = 0;
  54 int hammer_tdmux_ticks;
  55 int hammer_count_fsyncs;
  56 int hammer_count_inodes;
  57 int hammer_count_iqueued;
  58 int hammer_count_reclaims;
  59 int hammer_count_records;
  60 int hammer_count_record_datas;
  61 int hammer_count_volumes;
  62 int hammer_count_buffers;
  63 int hammer_count_nodes;
  64 int64_t hammer_count_extra_space_used;
  65 int64_t hammer_stats_btree_lookups;
  66 int64_t hammer_stats_btree_searches;
  67 int64_t hammer_stats_btree_inserts;
  68 int64_t hammer_stats_btree_deletes;
  69 int64_t hammer_stats_btree_elements;
  70 int64_t hammer_stats_btree_splits;
  71 int64_t hammer_stats_btree_iterations;
  72 int64_t hammer_stats_btree_root_iterations;
  73 int64_t hammer_stats_record_iterations;
  74
  75 int64_t hammer_stats_file_read;
  76 int64_t hammer_stats_file_write;
  77 int64_t hammer_stats_file_iopsr;
  78 int64_t hammer_stats_file_iopsw;
  79 int64_t hammer_stats_disk_read;
  80 int64_t hammer_stats_disk_write;
  81 int64_t hammer_stats_inode_flushes;
  82 int64_t hammer_stats_commits;
  83 int64_t hammer_stats_undo;
  84 int64_t hammer_stats_redo;
  85
  86 long hammer_count_dirtybufspace;        /* global */
  87 int hammer_count_refedbufs;             /* global */
  88 int hammer_count_reservations;
  89 long hammer_count_io_running_read;
  90 long hammer_count_io_running_write;
  91 int hammer_count_io_locked;
  92 long hammer_limit_dirtybufspace;        /* per-mount */
  93 int hammer_limit_recs;                  /* as a whole XXX */
  94 int hammer_limit_inode_recs = 2048;     /* per inode */
  95 int hammer_limit_reclaims;
  96 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
  97 int hammer_limit_redo = 4096 * 1024;    /* per inode */
  98 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
  99 int hammer_verify_zone;
 100 int hammer_verify_data = 1;
 101 int hammer_double_buffer;
 102 int hammer_btree_full_undo = 1;
 103 int hammer_yield_check = 16;
 104 int hammer_fsync_mode = 3;
 105 int64_t hammer_contention_count;
 106
 107 int hammer_noatime = 1;
 108 TUNABLE_INT("vfs.hammer.noatime", &hammer_noatime);
 109
 110 /*
 111  * Live dedup debug counters (sysctls are writable so that counters
 112  * can be reset from userspace).
 113  */
 114 int64_t hammer_live_dedup_vnode_bcmps = 0;
 115 int64_t hammer_live_dedup_device_bcmps = 0;
 116 int64_t hammer_live_dedup_findblk_failures = 0;
 117 int64_t hammer_live_dedup_bmap_saves = 0;
 118
 119
 120 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 121
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 123            &hammer_supported_version, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 125            &hammer_debug_general, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 127            &hammer_debug_io, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 129            &hammer_debug_inode, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 131            &hammer_debug_locks, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 133            &hammer_debug_btree, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 135            &hammer_debug_tid, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 137            &hammer_debug_recover, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 139            &hammer_debug_critical, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 141            &hammer_cluster_enable, 0, "");
 142 /*
 143  * 0 - live dedup is disabled
 144  * 1 - dedup cache is populated on reads only
 145  * 2 - dedup cache is populated on both reads and writes
 146  *
 147  * LIVE_DEDUP IS DISABLED PERMANENTLY!  This feature appears to cause
 148  * blockmap corruption over time so we've turned it off permanently.
 149  */
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD,
 151            &hammer_live_dedup, 0, "Enable live dedup (experimental)");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 153            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 154
 155 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 156            &hammer_limit_dirtybufspace, 0, "");
 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 158            &hammer_limit_recs, 0, "");
 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 160            &hammer_limit_inode_recs, 0, "");
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 162            &hammer_limit_reclaims, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 164            &hammer_live_dedup_cache_size, 0,
 165            "Number of cache entries");
 166 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 167            &hammer_limit_redo, 0, "");
 168
 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 170            &hammer_count_fsyncs, 0, "");
 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 172            &hammer_count_inodes, 0, "");
 173 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 174            &hammer_count_iqueued, 0, "");
 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 176            &hammer_count_reclaims, 0, "");
 177 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 178            &hammer_count_records, 0, "");
 179 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 180            &hammer_count_record_datas, 0, "");
 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 182            &hammer_count_volumes, 0, "");
 183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 184            &hammer_count_buffers, 0, "");
 185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 186            &hammer_count_nodes, 0, "");
 187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 188            &hammer_count_extra_space_used, 0, "");
 189
 190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 191            &hammer_stats_btree_searches, 0, "");
 192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 193            &hammer_stats_btree_lookups, 0, "");
 194 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 195            &hammer_stats_btree_inserts, 0, "");
 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 197            &hammer_stats_btree_deletes, 0, "");
 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 199            &hammer_stats_btree_elements, 0, "");
 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 201            &hammer_stats_btree_splits, 0, "");
 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 203            &hammer_stats_btree_iterations, 0, "");
 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 205            &hammer_stats_btree_root_iterations, 0, "");
 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 207            &hammer_stats_record_iterations, 0, "");
 208
 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 210            &hammer_stats_file_read, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 212            &hammer_stats_file_write, 0, "");
 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 214            &hammer_stats_file_iopsr, 0, "");
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 216            &hammer_stats_file_iopsw, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 218            &hammer_stats_disk_read, 0, "");
 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 220            &hammer_stats_disk_write, 0, "");
 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 222            &hammer_stats_inode_flushes, 0, "");
 223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 224            &hammer_stats_commits, 0, "");
 225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 226            &hammer_stats_undo, 0, "");
 227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 228            &hammer_stats_redo, 0, "");
 229
 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 231             &hammer_live_dedup_vnode_bcmps, 0,
 232             "successful vnode buffer comparisons");
 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 234             &hammer_live_dedup_device_bcmps, 0,
 235             "successful device buffer comparisons");
 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 237             &hammer_live_dedup_findblk_failures, 0,
 238             "block lookup failures for comparison");
 239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 240             &hammer_live_dedup_bmap_saves, 0,
 241             "useful physical block lookups");
 242
 243 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 244            &hammer_count_dirtybufspace, 0, "");
 245 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 246            &hammer_count_refedbufs, 0, "");
 247 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 248            &hammer_count_reservations, 0, "");
 249 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 250            &hammer_count_io_running_read, 0, "");
 251 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 252            &hammer_count_io_locked, 0, "");
 253 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 254            &hammer_count_io_running_write, 0, "");
 255 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 256            &hammer_contention_count, 0, "");
 257 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 258            &hammer_autoflush, 0, "");
 259 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 260            &hammer_verify_zone, 0, "");
 261 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 262            &hammer_verify_data, 0, "");
 263 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 264            &hammer_double_buffer, 0, "");
 265 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
 266            &hammer_btree_full_undo, 0, "");
 267 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 268            &hammer_yield_check, 0, "");
 269 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 270            &hammer_fsync_mode, 0, "");
 271
 272 /* KTR_INFO_MASTER(hammer); */
 273
 274 /*
 275  * VFS ABI
 276  */
 277 static void     hammer_free_hmp(struct mount *mp);
 278
 279 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 280                                 struct ucred *cred);
 281 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 282 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 283 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 284                                 struct ucred *cred);
 285 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 286                                 struct ucred *cred);
 287 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 288 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 289                                 ino_t ino, struct vnode **vpp);
 290 static int      hammer_vfs_init(struct vfsconf *conf);
 291 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 292                                 struct fid *fhp, struct vnode **vpp);
 293 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 294 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 295                                 int *exflagsp, struct ucred **credanonp);
 296
 297
 298 static struct vfsops hammer_vfsops = {
 299         .vfs_mount      = hammer_vfs_mount,
 300         .vfs_unmount    = hammer_vfs_unmount,
 301         .vfs_root       = hammer_vfs_root,
 302         .vfs_statfs     = hammer_vfs_statfs,
 303         .vfs_statvfs    = hammer_vfs_statvfs,
 304         .vfs_sync       = hammer_vfs_sync,
 305         .vfs_vget       = hammer_vfs_vget,
 306         .vfs_init       = hammer_vfs_init,
 307         .vfs_vptofh     = hammer_vfs_vptofh,
 308         .vfs_fhtovp     = hammer_vfs_fhtovp,
 309         .vfs_checkexp   = hammer_vfs_checkexp
 310 };
 311
 312 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 313
 314 VFS_SET(hammer_vfsops, hammer, 0);
 315 MODULE_VERSION(hammer, 1);
 316
 317 static int
 318 hammer_vfs_init(struct vfsconf *conf)
 319 {
 320         long n;
 321
 322         /*
 323          * Wait up to this long for an exclusive deadlock to clear
 324          * before acquiring a new shared lock on the ip.  The deadlock
 325          * may have occured on a b-tree node related to the ip.
 326          */
 327         if (hammer_tdmux_ticks == 0)
 328                 hammer_tdmux_ticks = hz / 5;
 329
 330         /*
 331          * Autosize, but be careful because a hammer filesystem's
 332          * reserve is partially calculated based on dirtybufspace,
 333          * so we simply cannot allow it to get too large.
 334          */
 335         if (hammer_limit_recs == 0) {
 336                 n = nbuf * 25;
 337                 if (n > kmalloc_limit(M_HAMMER) / 512)
 338                         n = kmalloc_limit(M_HAMMER) / 512;
 339                 if (n > 2 * 1024 * 1024)
 340                         n = 2 * 1024 * 1024;
 341                 hammer_limit_recs = (int)n;
 342         }
 343         if (hammer_limit_dirtybufspace == 0) {
 344                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 345                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
 346                         hammer_limit_dirtybufspace = 1024L * 1024;
 347                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
 348                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
 349         }
 350
 351         /*
 352          * The hammer_inode structure detaches from the vnode on reclaim.
 353          * This limits the number of inodes in this state to prevent a
 354          * memory pool blowout.
 355          */
 356         if (hammer_limit_reclaims == 0)
 357                 hammer_limit_reclaims = desiredvnodes / 10;
 358
 359         return(0);
 360 }
 361
 362 static int
 363 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 364                  struct ucred *cred)
 365 {
 366         struct hammer_mount_info info;
 367         hammer_mount_t hmp;
 368         hammer_volume_t rootvol;
 369         struct vnode *rootvp;
 370         struct vnode *devvp = NULL;
 371         const char *upath;      /* volume name in userspace */
 372         char *path;             /* volume name in system space */
 373         int error;
 374         int i;
 375         int master_id;
 376         int nvolumes;
 377         char *next_volume_ptr = NULL;
 378
 379         if (hammer_noatime) {
 380                 /* Force noatime */
 381                 mp->mnt_flag |= MNT_NOATIME;
 382         }
 383
 384         /*
 385          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 386          */
 387         if (mntpt == NULL) {
 388                 bzero(&info, sizeof(info));
 389                 info.asof = 0;
 390                 info.hflags = 0;
 391                 info.nvolumes = 1;
 392
 393                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 394
 395                 /* Count number of volumes separated by ':' */
 396                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 397                         if (*p == ':') {
 398                                 ++info.nvolumes;
 399                         }
 400                 }
 401
 402                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 403         } else {
 404                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 405                         return (error);
 406         }
 407
 408         /*
 409          * updating or new mount
 410          */
 411         if (mp->mnt_flag & MNT_UPDATE) {
 412                 hmp = (void *)mp->mnt_data;
 413                 KKASSERT(hmp != NULL);
 414         } else {
 415                 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
 416                         return (EINVAL);
 417                 hmp = NULL;
 418         }
 419
 420         /*
 421          * master-id validation.  The master id may not be changed by a
 422          * mount update.
 423          */
 424         if (info.hflags & HMNT_MASTERID || info.hflags & HMNT_NOMIRROR) {
 425                 if (hmp && hmp->master_id != info.master_id) {
 426                         hkprintf("cannot change master id with mount update\n");
 427                         return(EINVAL);
 428                 }
 429                 master_id = info.master_id;
 430                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 431                         return (EINVAL);
 432         } else {
 433                 if (hmp)
 434                         master_id = hmp->master_id;
 435                 else
 436                         master_id = 0;
 437         }
 438
 439         /*
 440          * Internal mount data structure
 441          */
 442         if (hmp == NULL) {
 443                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 444                 mp->mnt_data = (qaddr_t)hmp;
 445                 hmp->mp = mp;
 446
 447                 /*
 448                  * Make sure kmalloc type limits are set appropriately.
 449                  *
 450                  * Our inode kmalloc group is sized based on maxvnodes
 451                  * (controlled by the system, not us).
 452                  */
 453                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 454                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 455
 456                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 457
 458                 hmp->root_btree_beg.localization = 0x00000000U;
 459                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 460                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 461                 hmp->root_btree_beg.create_tid = 1;
 462                 hmp->root_btree_beg.delete_tid = 1;
 463                 hmp->root_btree_beg.rec_type = 0;
 464                 hmp->root_btree_beg.obj_type = 0;
 465                 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
 466
 467                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 468                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 469                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 470                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 471                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 472                 hmp->root_btree_end.rec_type = 0xFFFFU;
 473                 hmp->root_btree_end.obj_type = 0;
 474                 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
 475
 476                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 477                 hmp->krate.count = -16; /* initial burst */
 478                 hmp->kdiag.freq = 1;    /* maximum reporting rate (hz) */
 479                 hmp->kdiag.count = -16; /* initial burst */
 480
 481                 hmp->sync_lock.refs = 1;
 482                 hmp->free_lock.refs = 1;
 483                 hmp->undo_lock.refs = 1;
 484                 hmp->blkmap_lock.refs = 1;
 485                 hmp->snapshot_lock.refs = 1;
 486                 hmp->volume_lock.refs = 1;
 487
 488                 TAILQ_INIT(&hmp->delay_list);
 489                 TAILQ_INIT(&hmp->flush_group_list);
 490                 TAILQ_INIT(&hmp->objid_cache_list);
 491                 TAILQ_INIT(&hmp->undo_lru_list);
 492                 TAILQ_INIT(&hmp->reclaim_list);
 493
 494                 RB_INIT(&hmp->rb_dedup_crc_root);
 495                 RB_INIT(&hmp->rb_dedup_off_root);
 496                 TAILQ_INIT(&hmp->dedup_lru_list);
 497         }
 498         hmp->hflags &= ~HMNT_USERFLAGS;
 499         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 500
 501         hmp->master_id = master_id;
 502
 503         if (info.asof) {
 504                 mp->mnt_flag |= MNT_RDONLY;
 505                 hmp->asof = info.asof;
 506         } else {
 507                 hmp->asof = HAMMER_MAX_TID;
 508         }
 509
 510         hmp->volume_to_remove = -1;
 511
 512         /*
 513          * Re-open read-write if originally read-only, or vise-versa.
 514          *
 515          * When going from read-only to read-write execute the stage2
 516          * recovery if it has not already been run.
 517          */
 518         if (mp->mnt_flag & MNT_UPDATE) {
 519                 lwkt_gettoken(&hmp->fs_token);
 520                 error = 0;
 521                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 522                         hkprintf("read-only -> read-write\n");
 523                         hmp->ronly = 0;
 524                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 525                                 hammer_adjust_volume_mode, NULL);
 526                         rootvol = hammer_get_root_volume(hmp, &error);
 527                         if (rootvol) {
 528                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 529                                 error = hammer_recover_stage2(hmp, rootvol);
 530                                 bcopy(rootvol->ondisk->vol0_blockmap,
 531                                       hmp->blockmap,
 532                                       sizeof(hmp->blockmap));
 533                                 hammer_rel_volume(rootvol, 0);
 534                         }
 535                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 536                                 hammer_reload_inode, NULL);
 537                         /* kernel clears MNT_RDONLY */
 538                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 539                         hkprintf("read-write -> read-only\n");
 540                         hmp->ronly = 1; /* messy */
 541                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 542                                 hammer_reload_inode, NULL);
 543                         hmp->ronly = 0;
 544                         hammer_flusher_sync(hmp);
 545                         hammer_flusher_sync(hmp);
 546                         hammer_flusher_sync(hmp);
 547                         hmp->ronly = 1;
 548                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 549                                 hammer_adjust_volume_mode, NULL);
 550                 }
 551                 lwkt_reltoken(&hmp->fs_token);
 552                 return(error);
 553         }
 554
 555         RB_INIT(&hmp->rb_vols_root);
 556         RB_INIT(&hmp->rb_inos_root);
 557         RB_INIT(&hmp->rb_redo_root);
 558         RB_INIT(&hmp->rb_nods_root);
 559         RB_INIT(&hmp->rb_undo_root);
 560         RB_INIT(&hmp->rb_resv_root);
 561         RB_INIT(&hmp->rb_bufs_root);
 562         RB_INIT(&hmp->rb_pfsm_root);
 563
 564         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 565
 566         RB_INIT(&hmp->volu_root);
 567         RB_INIT(&hmp->undo_root);
 568         RB_INIT(&hmp->data_root);
 569         RB_INIT(&hmp->meta_root);
 570         RB_INIT(&hmp->lose_root);
 571         TAILQ_INIT(&hmp->iorun_list);
 572
 573         lwkt_token_init(&hmp->fs_token, "hammerfs");
 574         lwkt_token_init(&hmp->io_token, "hammerio");
 575
 576         lwkt_gettoken(&hmp->fs_token);
 577
 578         /*
 579          * Load volumes
 580          */
 581         path = objcache_get(namei_oc, M_WAITOK);
 582         hmp->nvolumes = -1;
 583         for (i = 0; i < info.nvolumes; ++i) {
 584                 if (mntpt == NULL) {
 585                         /*
 586                          * Root mount.
 587                          */
 588                         KKASSERT(next_volume_ptr != NULL);
 589                         strcpy(path, "");
 590                         if (*next_volume_ptr != '/') {
 591                                 /* relative path */
 592                                 strcpy(path, "/dev/");
 593                         }
 594                         int k;
 595                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 596                                 if (*next_volume_ptr == '\0') {
 597                                         break;
 598                                 } else if (*next_volume_ptr == ':') {
 599                                         ++next_volume_ptr;
 600                                         break;
 601                                 } else {
 602                                         path[k] = *next_volume_ptr;
 603                                         ++next_volume_ptr;
 604                                 }
 605                         }
 606                         path[k] = '\0';
 607
 608                         error = 0;
 609                         cdev_t dev = kgetdiskbyname(path);
 610                         error = bdevvp(dev, &devvp);
 611                         if (error) {
 612                                 hdkprintf("can't find devvp\n");
 613                         }
 614                 } else {
 615                         error = copyin(&info.volumes[i], &upath,
 616                                        sizeof(char *));
 617                         if (error == 0)
 618                                 error = copyinstr(upath, path,
 619                                                   MAXPATHLEN, NULL);
 620                 }
 621                 if (error == 0)
 622                         error = hammer_install_volume(hmp, path, devvp, NULL);
 623                 if (error)
 624                         break;
 625         }
 626         objcache_put(namei_oc, path);
 627
 628         /*
 629          * Make sure we found a root volume
 630          */
 631         if (hmp->rootvol == NULL) {
 632                 if (error == EBUSY) {
 633                         hdkprintf("The volumes are probably mounted\n");
 634                 } else {
 635                         hdkprintf("No root volume found!\n");
 636                         error = EINVAL;
 637                 }
 638                 goto failed;
 639         }
 640
 641         /*
 642          * Check that all required volumes are available
 643          */
 644         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 645                 hdkprintf("Missing volumes, cannot mount!\n");
 646                 error = EINVAL;
 647                 goto failed;
 648         }
 649
 650         /*
 651          * Other errors
 652          */
 653         if (error) {
 654                 hdkprintf("Failed to load volumes!\n");
 655                 goto failed;
 656         }
 657
 658         nvolumes = hammer_get_installed_volumes(hmp);
 659         if (hmp->nvolumes != nvolumes) {
 660                 hdkprintf("volume header says %d volumes, but %d installed\n",
 661                         hmp->nvolumes, nvolumes);
 662                 error = EINVAL;
 663                 goto failed;
 664         }
 665
 666         /*
 667          * No errors, setup enough of the mount point so we can lookup the
 668          * root vnode.
 669          */
 670         mp->mnt_iosize_max = MAXPHYS;
 671         mp->mnt_kern_flag |= MNTK_FSMID;
 672         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 673
 674         /*
 675          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 676          * will acquire a per-mount token prior to entry and release it
 677          * on return.
 678          */
 679         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 680
 681         /*
 682          * note: f_iosize is used by vnode_pager_haspage() when constructing
 683          * its VOP_BMAP call.
 684          */
 685         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 686         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 687
 688         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 689         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 690
 691         mp->mnt_maxsymlinklen = 255;
 692         mp->mnt_flag |= MNT_LOCAL;
 693
 694         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 695         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 696         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 697
 698         /*
 699          * The root volume's ondisk pointer is only valid if we hold a
 700          * reference to it.
 701          */
 702         rootvol = hammer_get_root_volume(hmp, &error);
 703         if (error)
 704                 goto failed;
 705
 706         /*
 707          * Perform any necessary UNDO operations.  The recovery code does
 708          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 709          * and then re-copy it again after recovery is complete.
 710          *
 711          * If this is a read-only mount the UNDO information is retained
 712          * in memory in the form of dirty buffer cache buffers, and not
 713          * written back to the media.
 714          */
 715         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 716               sizeof(hmp->blockmap));
 717
 718         /*
 719          * Check filesystem version
 720          */
 721         hmp->version = rootvol->ondisk->vol_version;
 722         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 723             hmp->version > HAMMER_VOL_VERSION_MAX) {
 724                 hkprintf("mount unsupported fs version %d\n", hmp->version);
 725                 error = ERANGE;
 726                 goto done;
 727         }
 728
 729         /*
 730          * The undo_rec_limit limits the size of flush groups to avoid
 731          * blowing out the UNDO FIFO.  This calculation is typically in
 732          * the tens of thousands and is designed primarily when small
 733          * HAMMER filesystems are created.
 734          */
 735         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 736         if (hammer_debug_general & 0x0001)
 737                 hkprintf("undo_rec_limit %d\n", hmp->undo_rec_limit);
 738
 739         /*
 740          * NOTE: Recover stage1 not only handles meta-data recovery, it
 741          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 742          */
 743         error = hammer_recover_stage1(hmp, rootvol);
 744         if (error) {
 745                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 746                 goto done;
 747         }
 748
 749         /*
 750          * Finish setup now that we have a good root volume.
 751          * vol_name is a filesystem label string.
 752          */
 753         ksnprintf(mp->mnt_stat.f_mntfromname,
 754                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 755                   rootvol->ondisk->vol_name);
 756         mp->mnt_stat.f_fsid.val[0] =
 757                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 758         mp->mnt_stat.f_fsid.val[1] =
 759                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 760         mp->mnt_stat.f_fsid.val[1] &= HAMMER_LOCALIZE_MASK;
 761
 762         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 763         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 764                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 765
 766         /*
 767          * Certain often-modified fields in the root volume are cached in
 768          * the hammer_mount structure so we do not have to generate lots
 769          * of little UNDO structures for them.
 770          *
 771          * Recopy after recovery.  This also has the side effect of
 772          * setting our cached undo FIFO's first_offset, which serves to
 773          * placemark the FIFO start for the NEXT flush cycle while the
 774          * on-disk first_offset represents the LAST flush cycle.
 775          */
 776         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 777         hmp->flush_tid1 = hmp->next_tid;
 778         hmp->flush_tid2 = hmp->next_tid;
 779         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 780               sizeof(hmp->blockmap));
 781         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 782
 783         hammer_flusher_create(hmp);
 784
 785         /*
 786          * Locate the root directory with an obj_id of 1.
 787          */
 788         error = hammer_vfs_root(mp, &rootvp);
 789         if (error)
 790                 goto done;
 791         vput(rootvp);
 792         if (hmp->ronly == 0)
 793                 error = hammer_recover_stage2(hmp, rootvol);
 794
 795         /*
 796          * If the stage2 recovery fails be sure to clean out all cached
 797          * vnodes before throwing away the mount structure or bad things
 798          * will happen.
 799          */
 800         if (error)
 801                 vflush(mp, 0, 0);
 802
 803 done:
 804         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 805                 /* New mount */
 806
 807                 /* Populate info for mount point (NULL pad)*/
 808                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
 809                 size_t size;
 810                 if (mntpt) {
 811                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
 812                                                         MNAMELEN -1, &size);
 813                 } else { /* Root mount */
 814                         mp->mnt_stat.f_mntonname[0] = '/';
 815                 }
 816         }
 817         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
 818         hammer_rel_volume(rootvol, 0);
 819 failed:
 820         /*
 821          * Cleanup and return.
 822          */
 823         if (error) {
 824                 /* called with fs_token held */
 825                 hammer_free_hmp(mp);
 826         } else {
 827                 lwkt_reltoken(&hmp->fs_token);
 828         }
 829         return (error);
 830 }
 831
 832 static int
 833 hammer_vfs_unmount(struct mount *mp, int mntflags)
 834 {
 835         hammer_mount_t hmp = (void *)mp->mnt_data;
 836         int flags;
 837         int error;
 838
 839         /*
 840          * Clean out the vnodes
 841          */
 842         lwkt_gettoken(&hmp->fs_token);
 843         flags = 0;
 844         if (mntflags & MNT_FORCE)
 845                 flags |= FORCECLOSE;
 846         error = vflush(mp, 0, flags);
 847
 848         /*
 849          * Clean up the internal mount structure and related entities.  This
 850          * may issue I/O.
 851          */
 852         if (error == 0) {
 853                 /* called with fs_token held */
 854                 hammer_free_hmp(mp);
 855         } else {
 856                 lwkt_reltoken(&hmp->fs_token);
 857         }
 858         return(error);
 859 }
 860
 861 /*
 862  * Clean up the internal mount structure and disassociate it from the mount.
 863  * This may issue I/O.
 864  *
 865  * Called with fs_token held.
 866  */
 867 static void
 868 hammer_free_hmp(struct mount *mp)
 869 {
 870         hammer_mount_t hmp = (void *)mp->mnt_data;
 871         hammer_flush_group_t flg;
 872
 873         /*
 874          * Flush anything dirty.  This won't even run if the
 875          * filesystem errored-out.
 876          */
 877         hammer_flush_dirty(hmp, 30);
 878
 879         /*
 880          * If the mount had a critical error we have to destroy any
 881          * remaining inodes before we can finish cleaning up the flusher.
 882          */
 883         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 884                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 885                         hammer_destroy_inode_callback, NULL);
 886         }
 887
 888         /*
 889          * There shouldn't be any inodes left now and any left over
 890          * flush groups should now be empty.
 891          */
 892         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 893         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 894                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 895                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 896                 if (flg->refs) {
 897                         hkprintf("Warning, flush_group %p was "
 898                                 "not empty on umount!\n", flg);
 899                 }
 900                 kfree(flg, hmp->m_misc);
 901         }
 902
 903         /*
 904          * We can finally destroy the flusher
 905          */
 906         hammer_flusher_destroy(hmp);
 907
 908         /*
 909          * We may have held recovered buffers due to a read-only mount.
 910          * These must be discarded.
 911          */
 912         if (hmp->ronly)
 913                 hammer_recover_flush_buffers(hmp, NULL, -1);
 914
 915         /*
 916          * Unload buffers and then volumes
 917          */
 918         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 919                 hammer_unload_buffer, NULL);
 920         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 921                 hammer_unload_volume, NULL);
 922
 923         mp->mnt_data = NULL;
 924         mp->mnt_flag &= ~MNT_LOCAL;
 925         hmp->mp = NULL;
 926         hammer_destroy_objid_cache(hmp);
 927         hammer_destroy_dedup_cache(hmp);
 928         if (hmp->dedup_free_cache != NULL) {
 929                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 930                 hmp->dedup_free_cache = NULL;
 931         }
 932         kmalloc_destroy(&hmp->m_misc);
 933         kmalloc_destroy(&hmp->m_inodes);
 934         lwkt_reltoken(&hmp->fs_token);
 935         kfree(hmp, M_HAMMER);
 936 }
 937
 938 /*
 939  * Report critical errors.  ip may be NULL.
 940  */
 941 void
 942 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 943                       int error, const char *msg)
 944 {
 945         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 946
 947         hmkrateprintf(&hmp->krate, hmp,
 948                     "Critical error inode=%jd error=%d %s\n",
 949                     (intmax_t)(ip ? ip->obj_id : -1),
 950                     error, msg);
 951
 952         if (hmp->ronly == 0) {
 953                 hmp->ronly = 2;         /* special errored read-only mode */
 954                 hmp->mp->mnt_flag |= MNT_RDONLY;
 955                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 956                         hammer_adjust_volume_mode, NULL);
 957                 hmkprintf(hmp, "Forcing read-only mode\n");
 958         }
 959         hmp->error = error;
 960         if (hammer_debug_critical)
 961                 Debugger("Entering debugger");
 962 }
 963
 964
 965 /*
 966  * Obtain a vnode for the specified inode number.  An exclusively locked
 967  * vnode is returned.
 968  */
 969 int
 970 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 971                 ino_t ino, struct vnode **vpp)
 972 {
 973         struct hammer_transaction trans;
 974         struct hammer_mount *hmp = (void *)mp->mnt_data;
 975         struct hammer_inode *ip;
 976         int error;
 977         uint32_t localization;
 978
 979         lwkt_gettoken(&hmp->fs_token);
 980         hammer_simple_transaction(&trans, hmp);
 981
 982         /*
 983          * If a directory vnode is supplied (mainly NFS) then we can acquire
 984          * the PFS domain from it.  Otherwise we would only be able to vget
 985          * inodes in the root PFS.
 986          */
 987         if (dvp) {
 988                 localization = HAMMER_DEF_LOCALIZATION |
 989                                 VTOI(dvp)->obj_localization;
 990         } else {
 991                 localization = HAMMER_DEF_LOCALIZATION;
 992         }
 993
 994         /*
 995          * Lookup the requested HAMMER inode.  The structure must be
 996          * left unlocked while we manipulate the related vnode to avoid
 997          * a deadlock.
 998          */
 999         ip = hammer_get_inode(&trans, NULL, ino,
1000                               hmp->asof, localization,
1001                               0, &error);
1002         if (ip == NULL) {
1003                 *vpp = NULL;
1004         } else {
1005                 error = hammer_get_vnode(ip, vpp);
1006                 hammer_rel_inode(ip, 0);
1007         }
1008         hammer_done_transaction(&trans);
1009         lwkt_reltoken(&hmp->fs_token);
1010         return (error);
1011 }
1012
1013 /*
1014  * Return the root vnode for the filesystem.
1015  *
1016  * HAMMER stores the root vnode in the hammer_mount structure so
1017  * getting it is easy.
1018  */
1019 static int
1020 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1021 {
1022         int error;
1023
1024         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp);
1025         return (error);
1026 }
1027
1028 static int
1029 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1030 {
1031         struct hammer_mount *hmp = (void *)mp->mnt_data;
1032         hammer_volume_t volume;
1033         hammer_volume_ondisk_t ondisk;
1034         int error;
1035         int64_t bfree;
1036         int64_t breserved;
1037
1038         lwkt_gettoken(&hmp->fs_token);
1039         volume = hammer_get_root_volume(hmp, &error);
1040         if (error) {
1041                 lwkt_reltoken(&hmp->fs_token);
1042                 return(error);
1043         }
1044         ondisk = volume->ondisk;
1045
1046         /*
1047          * Basic stats
1048          */
1049         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1050         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1051         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1052         hammer_rel_volume(volume, 0);
1053
1054         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1055         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1056         if (mp->mnt_stat.f_files < 0)
1057                 mp->mnt_stat.f_files = 0;
1058
1059         *sbp = mp->mnt_stat;
1060         lwkt_reltoken(&hmp->fs_token);
1061         return(0);
1062 }
1063
1064 static int
1065 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1066 {
1067         struct hammer_mount *hmp = (void *)mp->mnt_data;
1068         hammer_volume_t volume;
1069         hammer_volume_ondisk_t ondisk;
1070         int error;
1071         int64_t bfree;
1072         int64_t breserved;
1073
1074         lwkt_gettoken(&hmp->fs_token);
1075         volume = hammer_get_root_volume(hmp, &error);
1076         if (error) {
1077                 lwkt_reltoken(&hmp->fs_token);
1078                 return(error);
1079         }
1080         ondisk = volume->ondisk;
1081
1082         /*
1083          * Basic stats
1084          */
1085         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1086         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1087         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1088         hammer_rel_volume(volume, 0);
1089
1090         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1091         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1092         if (mp->mnt_vstat.f_files < 0)
1093                 mp->mnt_vstat.f_files = 0;
1094         *sbp = mp->mnt_vstat;
1095         lwkt_reltoken(&hmp->fs_token);
1096         return(0);
1097 }
1098
1099 /*
1100  * Sync the filesystem.  Currently we have to run it twice, the second
1101  * one will advance the undo start index to the end index, so if a crash
1102  * occurs no undos will be run on mount.
1103  *
1104  * We do not sync the filesystem if we are called from a panic.  If we did
1105  * we might end up blowing up a sync that was already in progress.
1106  */
1107 static int
1108 hammer_vfs_sync(struct mount *mp, int waitfor)
1109 {
1110         struct hammer_mount *hmp = (void *)mp->mnt_data;
1111         int error;
1112
1113         lwkt_gettoken(&hmp->fs_token);
1114         if (panicstr == NULL) {
1115                 error = hammer_sync_hmp(hmp, waitfor);
1116         } else {
1117                 error = EIO;
1118         }
1119         lwkt_reltoken(&hmp->fs_token);
1120         return (error);
1121 }
1122
1123 /*
1124  * Convert a vnode to a file handle.
1125  *
1126  * Accesses read-only fields on already-referenced structures so
1127  * no token is needed.
1128  */
1129 static int
1130 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1131 {
1132         hammer_inode_t ip;
1133
1134         KKASSERT(MAXFIDSZ >= 16);
1135         ip = VTOI(vp);
1136         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1137         fhp->fid_ext = ip->obj_localization >> 16;
1138         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1139         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1140         return(0);
1141 }
1142
1143
1144 /*
1145  * Convert a file handle back to a vnode.
1146  *
1147  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1148  * null mount.
1149  */
1150 static int
1151 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1152                   struct fid *fhp, struct vnode **vpp)
1153 {
1154         hammer_mount_t hmp = (void *)mp->mnt_data;
1155         struct hammer_transaction trans;
1156         struct hammer_inode *ip;
1157         struct hammer_inode_info info;
1158         int error;
1159         uint32_t localization;
1160
1161         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1162         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1163         if (rootvp)
1164                 localization = VTOI(rootvp)->obj_localization;
1165         else
1166                 localization = (uint32_t)fhp->fid_ext << 16;
1167
1168         lwkt_gettoken(&hmp->fs_token);
1169         hammer_simple_transaction(&trans, hmp);
1170
1171         /*
1172          * Get/allocate the hammer_inode structure.  The structure must be
1173          * unlocked while we manipulate the related vnode to avoid a
1174          * deadlock.
1175          */
1176         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1177                               info.obj_asof, localization, 0, &error);
1178         if (ip) {
1179                 error = hammer_get_vnode(ip, vpp);
1180                 hammer_rel_inode(ip, 0);
1181         } else {
1182                 *vpp = NULL;
1183         }
1184         hammer_done_transaction(&trans);
1185         lwkt_reltoken(&hmp->fs_token);
1186         return (error);
1187 }
1188
1189 static int
1190 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1191                     int *exflagsp, struct ucred **credanonp)
1192 {
1193         hammer_mount_t hmp = (void *)mp->mnt_data;
1194         struct netcred *np;
1195         int error;
1196
1197         lwkt_gettoken(&hmp->fs_token);
1198         np = vfs_export_lookup(mp, &hmp->export, nam);
1199         if (np) {
1200                 *exflagsp = np->netc_exflags;
1201                 *credanonp = &np->netc_anon;
1202                 error = 0;
1203         } else {
1204                 error = EACCES;
1205         }
1206         lwkt_reltoken(&hmp->fs_token);
1207         return (error);
1208
1209 }
1210
1211 int
1212 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1213 {
1214         hammer_mount_t hmp = (void *)mp->mnt_data;
1215         int error;
1216
1217         lwkt_gettoken(&hmp->fs_token);
1218
1219         switch(op) {
1220         case MOUNTCTL_SET_EXPORT:
1221                 error = vfs_export(mp, &hmp->export, export);
1222                 break;
1223         default:
1224                 error = EOPNOTSUPP;
1225                 break;
1226         }
1227         lwkt_reltoken(&hmp->fs_token);
1228
1229         return(error);
1230 }
1231