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/nlookup.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_debug = 1;             /* medium-error panics */
  47 int hammer_debug_inode;
  48 int hammer_debug_locks;
  49 int hammer_debug_btree;
  50 int hammer_debug_tid;
  51 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  52 int hammer_debug_recover_faults;
  53 int hammer_debug_critical;              /* non-zero enter debugger on error */
  54 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  55 int hammer_live_dedup = 0;
  56 int hammer_tdmux_ticks;
  57 int hammer_count_fsyncs;
  58 int hammer_count_inodes;
  59 int hammer_count_iqueued;
  60 int hammer_count_reclaims;
  61 int hammer_count_records;
  62 int hammer_count_record_datas;
  63 int hammer_count_volumes;
  64 int hammer_count_buffers;
  65 int hammer_count_nodes;
  66 int64_t hammer_count_extra_space_used;
  67 int64_t hammer_stats_btree_lookups;
  68 int64_t hammer_stats_btree_searches;
  69 int64_t hammer_stats_btree_inserts;
  70 int64_t hammer_stats_btree_deletes;
  71 int64_t hammer_stats_btree_elements;
  72 int64_t hammer_stats_btree_splits;
  73 int64_t hammer_stats_btree_iterations;
  74 int64_t hammer_stats_btree_root_iterations;
  75 int64_t hammer_stats_record_iterations;
  76
  77 int64_t hammer_stats_file_read;
  78 int64_t hammer_stats_file_write;
  79 int64_t hammer_stats_file_iopsr;
  80 int64_t hammer_stats_file_iopsw;
  81 int64_t hammer_stats_disk_read;
  82 int64_t hammer_stats_disk_write;
  83 int64_t hammer_stats_inode_flushes;
  84 int64_t hammer_stats_commits;
  85 int64_t hammer_stats_undo;
  86 int64_t hammer_stats_redo;
  87
  88 long hammer_count_dirtybufspace;        /* global */
  89 int hammer_count_refedbufs;             /* global */
  90 int hammer_count_reservations;
  91 long hammer_count_io_running_read;
  92 long hammer_count_io_running_write;
  93 int hammer_count_io_locked;
  94 long hammer_limit_dirtybufspace;        /* per-mount */
  95 int hammer_limit_recs;                  /* as a whole XXX */
  96 int hammer_limit_inode_recs = 2048;     /* per inode */
  97 int hammer_limit_reclaims;
  98 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
  99 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 100 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
 101 int hammer_bio_count;
 102 int hammer_verify_zone;
 103 int hammer_verify_data = 1;
 104 int hammer_write_mode;
 105 int hammer_double_buffer;
 106 int hammer_btree_full_undo = 1;
 107 int hammer_yield_check = 16;
 108 int hammer_fsync_mode = 3;
 109 int64_t hammer_contention_count;
 110 int64_t hammer_zone_limit;
 111
 112 /*
 113  * Live dedup debug counters (sysctls are writable so that counters
 114  * can be reset from userspace).
 115  */
 116 int64_t hammer_live_dedup_vnode_bcmps = 0;
 117 int64_t hammer_live_dedup_device_bcmps = 0;
 118 int64_t hammer_live_dedup_findblk_failures = 0;
 119 int64_t hammer_live_dedup_bmap_saves = 0;
 120
 121
 122 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 123
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 125            &hammer_supported_version, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 127            &hammer_debug_general, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 129            &hammer_debug_io, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 131            &hammer_debug_debug, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 133            &hammer_debug_inode, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 135            &hammer_debug_locks, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 137            &hammer_debug_btree, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 139            &hammer_debug_tid, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 141            &hammer_debug_recover, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 143            &hammer_debug_recover_faults, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 145            &hammer_debug_critical, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 147            &hammer_cluster_enable, 0, "");
 148 /*
 149  * 0 - live dedup is disabled
 150  * 1 - dedup cache is populated on reads only
 151  * 2 - dedup cache is populated on both reads and writes
 152  *
 153  * LIVE_DEDUP IS DISABLED PERMANENTLY!  This feature appears to cause
 154  * blockmap corruption over time so we've turned it off permanently.
 155  */
 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD,
 157            &hammer_live_dedup, 0, "Enable live dedup (experimental)");
 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 159            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 160
 161 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 162            &hammer_limit_dirtybufspace, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 164            &hammer_limit_recs, 0, "");
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 166            &hammer_limit_inode_recs, 0, "");
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 168            &hammer_limit_reclaims, 0, "");
 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 170            &hammer_live_dedup_cache_size, 0,
 171            "Number of cache entries");
 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 173            &hammer_limit_redo, 0, "");
 174
 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 176            &hammer_count_fsyncs, 0, "");
 177 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 178            &hammer_count_inodes, 0, "");
 179 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 180            &hammer_count_iqueued, 0, "");
 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 182            &hammer_count_reclaims, 0, "");
 183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 184            &hammer_count_records, 0, "");
 185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 186            &hammer_count_record_datas, 0, "");
 187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 188            &hammer_count_volumes, 0, "");
 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 190            &hammer_count_buffers, 0, "");
 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 192            &hammer_count_nodes, 0, "");
 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 194            &hammer_count_extra_space_used, 0, "");
 195
 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 197            &hammer_stats_btree_searches, 0, "");
 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 199            &hammer_stats_btree_lookups, 0, "");
 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 201            &hammer_stats_btree_inserts, 0, "");
 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 203            &hammer_stats_btree_deletes, 0, "");
 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 205            &hammer_stats_btree_elements, 0, "");
 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 207            &hammer_stats_btree_splits, 0, "");
 208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 209            &hammer_stats_btree_iterations, 0, "");
 210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 211            &hammer_stats_btree_root_iterations, 0, "");
 212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 213            &hammer_stats_record_iterations, 0, "");
 214
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 216            &hammer_stats_file_read, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 218            &hammer_stats_file_write, 0, "");
 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 220            &hammer_stats_file_iopsr, 0, "");
 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 222            &hammer_stats_file_iopsw, 0, "");
 223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 224            &hammer_stats_disk_read, 0, "");
 225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 226            &hammer_stats_disk_write, 0, "");
 227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 228            &hammer_stats_inode_flushes, 0, "");
 229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 230            &hammer_stats_commits, 0, "");
 231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 232            &hammer_stats_undo, 0, "");
 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 234            &hammer_stats_redo, 0, "");
 235
 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 237             &hammer_live_dedup_vnode_bcmps, 0,
 238             "successful vnode buffer comparisons");
 239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 240             &hammer_live_dedup_device_bcmps, 0,
 241             "successful device buffer comparisons");
 242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 243             &hammer_live_dedup_findblk_failures, 0,
 244             "block lookup failures for comparison");
 245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 246             &hammer_live_dedup_bmap_saves, 0,
 247             "useful physical block lookups");
 248
 249 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 250            &hammer_count_dirtybufspace, 0, "");
 251 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 252            &hammer_count_refedbufs, 0, "");
 253 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 254            &hammer_count_reservations, 0, "");
 255 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 256            &hammer_count_io_running_read, 0, "");
 257 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 258            &hammer_count_io_locked, 0, "");
 259 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 260            &hammer_count_io_running_write, 0, "");
 261 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 262            &hammer_zone_limit, 0, "");
 263 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 264            &hammer_contention_count, 0, "");
 265 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 266            &hammer_autoflush, 0, "");
 267 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 268            &hammer_verify_zone, 0, "");
 269 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 270            &hammer_verify_data, 0, "");
 271 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 272            &hammer_write_mode, 0, "");
 273 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 274            &hammer_double_buffer, 0, "");
 275 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
 276            &hammer_btree_full_undo, 0, "");
 277 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 278            &hammer_yield_check, 0, "");
 279 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 280            &hammer_fsync_mode, 0, "");
 281
 282 /* KTR_INFO_MASTER(hammer); */
 283
 284 /*
 285  * VFS ABI
 286  */
 287 static void     hammer_free_hmp(struct mount *mp);
 288
 289 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 290                                 struct ucred *cred);
 291 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 292 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 293 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 294                                 struct ucred *cred);
 295 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 296                                 struct ucred *cred);
 297 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 298 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 299                                 ino_t ino, struct vnode **vpp);
 300 static int      hammer_vfs_init(struct vfsconf *conf);
 301 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 302                                 struct fid *fhp, struct vnode **vpp);
 303 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 304 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 305                                 int *exflagsp, struct ucred **credanonp);
 306
 307
 308 static struct vfsops hammer_vfsops = {
 309         .vfs_mount      = hammer_vfs_mount,
 310         .vfs_unmount    = hammer_vfs_unmount,
 311         .vfs_root       = hammer_vfs_root,
 312         .vfs_statfs     = hammer_vfs_statfs,
 313         .vfs_statvfs    = hammer_vfs_statvfs,
 314         .vfs_sync       = hammer_vfs_sync,
 315         .vfs_vget       = hammer_vfs_vget,
 316         .vfs_init       = hammer_vfs_init,
 317         .vfs_vptofh     = hammer_vfs_vptofh,
 318         .vfs_fhtovp     = hammer_vfs_fhtovp,
 319         .vfs_checkexp   = hammer_vfs_checkexp
 320 };
 321
 322 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 323
 324 VFS_SET(hammer_vfsops, hammer, 0);
 325 MODULE_VERSION(hammer, 1);
 326
 327 static int
 328 hammer_vfs_init(struct vfsconf *conf)
 329 {
 330         long n;
 331
 332         /*
 333          * Wait up to this long for an exclusive deadlock to clear
 334          * before acquiring a new shared lock on the ip.  The deadlock
 335          * may have occured on a b-tree node related to the ip.
 336          */
 337         if (hammer_tdmux_ticks == 0)
 338                 hammer_tdmux_ticks = hz / 5;
 339
 340         /*
 341          * Autosize, but be careful because a hammer filesystem's
 342          * reserve is partially calculated based on dirtybufspace,
 343          * so we simply cannot allow it to get too large.
 344          */
 345         if (hammer_limit_recs == 0) {
 346                 n = nbuf * 25;
 347                 if (n > kmalloc_limit(M_HAMMER) / 512)
 348                         n = kmalloc_limit(M_HAMMER) / 512;
 349                 if (n > 2 * 1024 * 1024)
 350                         n = 2 * 1024 * 1024;
 351                 hammer_limit_recs = (int)n;
 352         }
 353         if (hammer_limit_dirtybufspace == 0) {
 354                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 355                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
 356                         hammer_limit_dirtybufspace = 1024L * 1024;
 357                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
 358                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
 359         }
 360
 361         /*
 362          * The hammer_inode structure detaches from the vnode on reclaim.
 363          * This limits the number of inodes in this state to prevent a
 364          * memory pool blowout.
 365          */
 366         if (hammer_limit_reclaims == 0)
 367                 hammer_limit_reclaims = desiredvnodes / 10;
 368
 369         return(0);
 370 }
 371
 372 static int
 373 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 374                  struct ucred *cred)
 375 {
 376         struct hammer_mount_info info;
 377         hammer_mount_t hmp;
 378         hammer_volume_t rootvol;
 379         struct vnode *rootvp;
 380         struct vnode *devvp = NULL;
 381         const char *upath;      /* volume name in userspace */
 382         char *path;             /* volume name in system space */
 383         int error;
 384         int i;
 385         int master_id;
 386         int nvolumes;
 387         char *next_volume_ptr = NULL;
 388
 389         /*
 390          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 391          */
 392         if (mntpt == NULL) {
 393                 bzero(&info, sizeof(info));
 394                 info.asof = 0;
 395                 info.hflags = 0;
 396                 info.nvolumes = 1;
 397
 398                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 399
 400                 /* Count number of volumes separated by ':' */
 401                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 402                         if (*p == ':') {
 403                                 ++info.nvolumes;
 404                         }
 405                 }
 406
 407                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 408         } else {
 409                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 410                         return (error);
 411         }
 412
 413         /*
 414          * updating or new mount
 415          */
 416         if (mp->mnt_flag & MNT_UPDATE) {
 417                 hmp = (void *)mp->mnt_data;
 418                 KKASSERT(hmp != NULL);
 419         } else {
 420                 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
 421                         return (EINVAL);
 422                 hmp = NULL;
 423         }
 424
 425         /*
 426          * master-id validation.  The master id may not be changed by a
 427          * mount update.
 428          */
 429         if (info.hflags & HMNT_MASTERID) {
 430                 if (hmp && hmp->master_id != info.master_id) {
 431                         kprintf("HAMMER: cannot change master id "
 432                                 "with mount update\n");
 433                         return(EINVAL);
 434                 }
 435                 master_id = info.master_id;
 436                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 437                         return (EINVAL);
 438         } else {
 439                 if (hmp)
 440                         master_id = hmp->master_id;
 441                 else
 442                         master_id = 0;
 443         }
 444
 445         /*
 446          * Internal mount data structure
 447          */
 448         if (hmp == NULL) {
 449                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 450                 mp->mnt_data = (qaddr_t)hmp;
 451                 hmp->mp = mp;
 452
 453                 /*
 454                  * Make sure kmalloc type limits are set appropriately.
 455                  *
 456                  * Our inode kmalloc group is sized based on maxvnodes
 457                  * (controlled by the system, not us).
 458                  */
 459                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 460                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 461
 462                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 463
 464                 hmp->root_btree_beg.localization = 0x00000000U;
 465                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 466                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 467                 hmp->root_btree_beg.create_tid = 1;
 468                 hmp->root_btree_beg.delete_tid = 1;
 469                 hmp->root_btree_beg.rec_type = 0;
 470                 hmp->root_btree_beg.obj_type = 0;
 471                 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
 472
 473                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 474                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 475                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 476                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 477                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 478                 hmp->root_btree_end.rec_type = 0xFFFFU;
 479                 hmp->root_btree_end.obj_type = 0;
 480                 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
 481
 482                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 483                 hmp->krate.count = -16; /* initial burst */
 484                 hmp->kdiag.freq = 1;    /* maximum reporting rate (hz) */
 485                 hmp->kdiag.count = -16; /* initial burst */
 486
 487                 hmp->sync_lock.refs = 1;
 488                 hmp->free_lock.refs = 1;
 489                 hmp->undo_lock.refs = 1;
 490                 hmp->blkmap_lock.refs = 1;
 491                 hmp->snapshot_lock.refs = 1;
 492                 hmp->volume_lock.refs = 1;
 493
 494                 TAILQ_INIT(&hmp->delay_list);
 495                 TAILQ_INIT(&hmp->flush_group_list);
 496                 TAILQ_INIT(&hmp->objid_cache_list);
 497                 TAILQ_INIT(&hmp->undo_lru_list);
 498                 TAILQ_INIT(&hmp->reclaim_list);
 499
 500                 RB_INIT(&hmp->rb_dedup_crc_root);
 501                 RB_INIT(&hmp->rb_dedup_off_root);
 502                 TAILQ_INIT(&hmp->dedup_lru_list);
 503         }
 504         hmp->hflags &= ~HMNT_USERFLAGS;
 505         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 506
 507         hmp->master_id = master_id;
 508
 509         if (info.asof) {
 510                 mp->mnt_flag |= MNT_RDONLY;
 511                 hmp->asof = info.asof;
 512         } else {
 513                 hmp->asof = HAMMER_MAX_TID;
 514         }
 515
 516         hmp->volume_to_remove = -1;
 517
 518         /*
 519          * Re-open read-write if originally read-only, or vise-versa.
 520          *
 521          * When going from read-only to read-write execute the stage2
 522          * recovery if it has not already been run.
 523          */
 524         if (mp->mnt_flag & MNT_UPDATE) {
 525                 lwkt_gettoken(&hmp->fs_token);
 526                 error = 0;
 527                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 528                         kprintf("HAMMER: read-only -> read-write\n");
 529                         hmp->ronly = 0;
 530                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 531                                 hammer_adjust_volume_mode, NULL);
 532                         rootvol = hammer_get_root_volume(hmp, &error);
 533                         if (rootvol) {
 534                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 535                                 error = hammer_recover_stage2(hmp, rootvol);
 536                                 bcopy(rootvol->ondisk->vol0_blockmap,
 537                                       hmp->blockmap,
 538                                       sizeof(hmp->blockmap));
 539                                 hammer_rel_volume(rootvol, 0);
 540                         }
 541                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 542                                 hammer_reload_inode, NULL);
 543                         /* kernel clears MNT_RDONLY */
 544                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 545                         kprintf("HAMMER: read-write -> read-only\n");
 546                         hmp->ronly = 1; /* messy */
 547                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 548                                 hammer_reload_inode, NULL);
 549                         hmp->ronly = 0;
 550                         hammer_flusher_sync(hmp);
 551                         hammer_flusher_sync(hmp);
 552                         hammer_flusher_sync(hmp);
 553                         hmp->ronly = 1;
 554                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 555                                 hammer_adjust_volume_mode, NULL);
 556                 }
 557                 lwkt_reltoken(&hmp->fs_token);
 558                 return(error);
 559         }
 560
 561         RB_INIT(&hmp->rb_vols_root);
 562         RB_INIT(&hmp->rb_inos_root);
 563         RB_INIT(&hmp->rb_redo_root);
 564         RB_INIT(&hmp->rb_nods_root);
 565         RB_INIT(&hmp->rb_undo_root);
 566         RB_INIT(&hmp->rb_resv_root);
 567         RB_INIT(&hmp->rb_bufs_root);
 568         RB_INIT(&hmp->rb_pfsm_root);
 569
 570         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 571
 572         RB_INIT(&hmp->volu_root);
 573         RB_INIT(&hmp->undo_root);
 574         RB_INIT(&hmp->data_root);
 575         RB_INIT(&hmp->meta_root);
 576         RB_INIT(&hmp->lose_root);
 577         TAILQ_INIT(&hmp->iorun_list);
 578
 579         lwkt_token_init(&hmp->fs_token, "hammerfs");
 580         lwkt_token_init(&hmp->io_token, "hammerio");
 581
 582         lwkt_gettoken(&hmp->fs_token);
 583
 584         /*
 585          * Load volumes
 586          */
 587         path = objcache_get(namei_oc, M_WAITOK);
 588         hmp->nvolumes = -1;
 589         for (i = 0; i < info.nvolumes; ++i) {
 590                 if (mntpt == NULL) {
 591                         /*
 592                          * Root mount.
 593                          */
 594                         KKASSERT(next_volume_ptr != NULL);
 595                         strcpy(path, "");
 596                         if (*next_volume_ptr != '/') {
 597                                 /* relative path */
 598                                 strcpy(path, "/dev/");
 599                         }
 600                         int k;
 601                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 602                                 if (*next_volume_ptr == '\0') {
 603                                         break;
 604                                 } else if (*next_volume_ptr == ':') {
 605                                         ++next_volume_ptr;
 606                                         break;
 607                                 } else {
 608                                         path[k] = *next_volume_ptr;
 609                                         ++next_volume_ptr;
 610                                 }
 611                         }
 612                         path[k] = '\0';
 613
 614                         error = 0;
 615                         cdev_t dev = kgetdiskbyname(path);
 616                         error = bdevvp(dev, &devvp);
 617                         if (error) {
 618                                 kprintf("hammer_mount: can't find devvp\n");
 619                         }
 620                 } else {
 621                         error = copyin(&info.volumes[i], &upath,
 622                                        sizeof(char *));
 623                         if (error == 0)
 624                                 error = copyinstr(upath, path,
 625                                                   MAXPATHLEN, NULL);
 626                 }
 627                 if (error == 0)
 628                         error = hammer_install_volume(hmp, path, devvp, NULL);
 629                 if (error)
 630                         break;
 631         }
 632         objcache_put(namei_oc, path);
 633
 634         /*
 635          * Make sure we found a root volume
 636          */
 637         if (hmp->rootvol == NULL) {
 638                 kprintf("hammer_mount: No root volume found!\n");
 639                 error = EINVAL;
 640                 goto failed;
 641         }
 642
 643         /*
 644          * Check that all required volumes are available
 645          */
 646         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 647                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 648                 error = EINVAL;
 649                 goto failed;
 650         }
 651
 652         /*
 653          * Other errors
 654          */
 655         if (error) {
 656                 kprintf("hammer_mount: Failed to load volumes!\n");
 657                 goto failed;
 658         }
 659
 660         nvolumes = hammer_get_installed_volumes(hmp);
 661         if (hmp->nvolumes != nvolumes) {
 662                 kprintf("hammer_mount: volume header says %d volumes, "
 663                         "but %d installed\n",
 664                         hmp->nvolumes, nvolumes);
 665                 error = EINVAL;
 666                 goto failed;
 667         }
 668
 669         /*
 670          * No errors, setup enough of the mount point so we can lookup the
 671          * root vnode.
 672          */
 673         mp->mnt_iosize_max = MAXPHYS;
 674         mp->mnt_kern_flag |= MNTK_FSMID;
 675         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 676
 677         /*
 678          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 679          * will acquire a per-mount token prior to entry and release it
 680          * on return.
 681          */
 682         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 683
 684         /*
 685          * note: f_iosize is used by vnode_pager_haspage() when constructing
 686          * its VOP_BMAP call.
 687          */
 688         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 689         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 690
 691         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 692         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 693
 694         mp->mnt_maxsymlinklen = 255;
 695         mp->mnt_flag |= MNT_LOCAL;
 696
 697         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 698         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 699         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 700
 701         /*
 702          * The root volume's ondisk pointer is only valid if we hold a
 703          * reference to it.
 704          */
 705         rootvol = hammer_get_root_volume(hmp, &error);
 706         if (error)
 707                 goto failed;
 708
 709         /*
 710          * Perform any necessary UNDO operations.  The recovery code does
 711          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 712          * and then re-copy it again after recovery is complete.
 713          *
 714          * If this is a read-only mount the UNDO information is retained
 715          * in memory in the form of dirty buffer cache buffers, and not
 716          * written back to the media.
 717          */
 718         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 719               sizeof(hmp->blockmap));
 720
 721         /*
 722          * Check filesystem version
 723          */
 724         hmp->version = rootvol->ondisk->vol_version;
 725         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 726             hmp->version > HAMMER_VOL_VERSION_MAX) {
 727                 kprintf("HAMMER: mount unsupported fs version %d\n",
 728                         hmp->version);
 729                 error = ERANGE;
 730                 goto done;
 731         }
 732
 733         /*
 734          * The undo_rec_limit limits the size of flush groups to avoid
 735          * blowing out the UNDO FIFO.  This calculation is typically in
 736          * the tens of thousands and is designed primarily when small
 737          * HAMMER filesystems are created.
 738          */
 739         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 740         if (hammer_debug_general & 0x0001)
 741                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 742
 743         /*
 744          * NOTE: Recover stage1 not only handles meta-data recovery, it
 745          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 746          */
 747         error = hammer_recover_stage1(hmp, rootvol);
 748         if (error) {
 749                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 750                 goto done;
 751         }
 752
 753         /*
 754          * Finish setup now that we have a good root volume.
 755          *
 756          * The top 16 bits of fsid.val[1] is a pfs id.
 757          */
 758         ksnprintf(mp->mnt_stat.f_mntfromname,
 759                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 760                   rootvol->ondisk->vol_name);
 761         mp->mnt_stat.f_fsid.val[0] =
 762                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 763         mp->mnt_stat.f_fsid.val[1] =
 764                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 765         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 766
 767         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 768         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 769                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 770
 771         /*
 772          * Certain often-modified fields in the root volume are cached in
 773          * the hammer_mount structure so we do not have to generate lots
 774          * of little UNDO structures for them.
 775          *
 776          * Recopy after recovery.  This also has the side effect of
 777          * setting our cached undo FIFO's first_offset, which serves to
 778          * placemark the FIFO start for the NEXT flush cycle while the
 779          * on-disk first_offset represents the LAST flush cycle.
 780          */
 781         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 782         hmp->flush_tid1 = hmp->next_tid;
 783         hmp->flush_tid2 = hmp->next_tid;
 784         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 785               sizeof(hmp->blockmap));
 786         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 787
 788         hammer_flusher_create(hmp);
 789
 790         /*
 791          * Locate the root directory with an obj_id of 1.
 792          */
 793         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, &rootvp);
 794         if (error)
 795                 goto done;
 796         vput(rootvp);
 797         if (hmp->ronly == 0)
 798                 error = hammer_recover_stage2(hmp, rootvol);
 799
 800         /*
 801          * If the stage2 recovery fails be sure to clean out all cached
 802          * vnodes before throwing away the mount structure or bad things
 803          * will happen.
 804          */
 805         if (error)
 806                 vflush(mp, 0, 0);
 807
 808 done:
 809         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 810                 /* New mount */
 811
 812                 /* Populate info for mount point (NULL pad)*/
 813                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
 814                 size_t size;
 815                 if (mntpt) {
 816                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
 817                                                         MNAMELEN -1, &size);
 818                 } else { /* Root mount */
 819                         mp->mnt_stat.f_mntonname[0] = '/';
 820                 }
 821         }
 822         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
 823         hammer_rel_volume(rootvol, 0);
 824 failed:
 825         /*
 826          * Cleanup and return.
 827          */
 828         if (error) {
 829                 /* called with fs_token held */
 830                 hammer_free_hmp(mp);
 831         } else {
 832                 lwkt_reltoken(&hmp->fs_token);
 833         }
 834         return (error);
 835 }
 836
 837 static int
 838 hammer_vfs_unmount(struct mount *mp, int mntflags)
 839 {
 840         hammer_mount_t hmp = (void *)mp->mnt_data;
 841         int flags;
 842         int error;
 843
 844         /*
 845          * Clean out the vnodes
 846          */
 847         lwkt_gettoken(&hmp->fs_token);
 848         flags = 0;
 849         if (mntflags & MNT_FORCE)
 850                 flags |= FORCECLOSE;
 851         error = vflush(mp, 0, flags);
 852
 853         /*
 854          * Clean up the internal mount structure and related entities.  This
 855          * may issue I/O.
 856          */
 857         if (error == 0) {
 858                 /* called with fs_token held */
 859                 hammer_free_hmp(mp);
 860         } else {
 861                 lwkt_reltoken(&hmp->fs_token);
 862         }
 863         return(error);
 864 }
 865
 866 /*
 867  * Clean up the internal mount structure and disassociate it from the mount.
 868  * This may issue I/O.
 869  *
 870  * Called with fs_token held.
 871  */
 872 static void
 873 hammer_free_hmp(struct mount *mp)
 874 {
 875         hammer_mount_t hmp = (void *)mp->mnt_data;
 876         hammer_flush_group_t flg;
 877
 878         /*
 879          * Flush anything dirty.  This won't even run if the
 880          * filesystem errored-out.
 881          */
 882         hammer_flush_dirty(hmp, 30);
 883
 884         /*
 885          * If the mount had a critical error we have to destroy any
 886          * remaining inodes before we can finish cleaning up the flusher.
 887          */
 888         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 889                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 890                         hammer_destroy_inode_callback, NULL);
 891         }
 892
 893         /*
 894          * There shouldn't be any inodes left now and any left over
 895          * flush groups should now be empty.
 896          */
 897         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 898         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 899                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 900                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 901                 if (flg->refs) {
 902                         kprintf("HAMMER: Warning, flush_group %p was "
 903                                 "not empty on umount!\n", flg);
 904                 }
 905                 kfree(flg, hmp->m_misc);
 906         }
 907
 908         /*
 909          * We can finally destroy the flusher
 910          */
 911         hammer_flusher_destroy(hmp);
 912
 913         /*
 914          * We may have held recovered buffers due to a read-only mount.
 915          * These must be discarded.
 916          */
 917         if (hmp->ronly)
 918                 hammer_recover_flush_buffers(hmp, NULL, -1);
 919
 920         /*
 921          * Unload buffers and then volumes
 922          */
 923         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 924                 hammer_unload_buffer, NULL);
 925         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 926                 hammer_unload_volume, NULL);
 927
 928         mp->mnt_data = NULL;
 929         mp->mnt_flag &= ~MNT_LOCAL;
 930         hmp->mp = NULL;
 931         hammer_destroy_objid_cache(hmp);
 932         hammer_destroy_dedup_cache(hmp);
 933         if (hmp->dedup_free_cache != NULL) {
 934                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 935                 hmp->dedup_free_cache = NULL;
 936         }
 937         kmalloc_destroy(&hmp->m_misc);
 938         kmalloc_destroy(&hmp->m_inodes);
 939         lwkt_reltoken(&hmp->fs_token);
 940         kfree(hmp, M_HAMMER);
 941 }
 942
 943 /*
 944  * Report critical errors.  ip may be NULL.
 945  */
 946 void
 947 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 948                       int error, const char *msg)
 949 {
 950         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 951
 952         krateprintf(&hmp->krate,
 953                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 954                     hmp->mp->mnt_stat.f_mntfromname,
 955                     (intmax_t)(ip ? ip->obj_id : -1),
 956                     error, msg);
 957
 958         if (hmp->ronly == 0) {
 959                 hmp->ronly = 2;         /* special errored read-only mode */
 960                 hmp->mp->mnt_flag |= MNT_RDONLY;
 961                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 962                         hammer_adjust_volume_mode, NULL);
 963                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 964                         hmp->mp->mnt_stat.f_mntfromname);
 965         }
 966         hmp->error = error;
 967         if (hammer_debug_critical)
 968                 Debugger("Entering debugger");
 969 }
 970
 971
 972 /*
 973  * Obtain a vnode for the specified inode number.  An exclusively locked
 974  * vnode is returned.
 975  */
 976 int
 977 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 978                 ino_t ino, struct vnode **vpp)
 979 {
 980         struct hammer_transaction trans;
 981         struct hammer_mount *hmp = (void *)mp->mnt_data;
 982         struct hammer_inode *ip;
 983         int error;
 984         u_int32_t localization;
 985
 986         lwkt_gettoken(&hmp->fs_token);
 987         hammer_simple_transaction(&trans, hmp);
 988
 989         /*
 990          * If a directory vnode is supplied (mainly NFS) then we can acquire
 991          * the PFS domain from it.  Otherwise we would only be able to vget
 992          * inodes in the root PFS.
 993          */
 994         if (dvp) {
 995                 localization = HAMMER_DEF_LOCALIZATION +
 996                                 VTOI(dvp)->obj_localization;
 997         } else {
 998                 localization = HAMMER_DEF_LOCALIZATION;
 999         }
1000
1001         /*
1002          * Lookup the requested HAMMER inode.  The structure must be
1003          * left unlocked while we manipulate the related vnode to avoid
1004          * a deadlock.
1005          */
1006         ip = hammer_get_inode(&trans, NULL, ino,
1007                               hmp->asof, localization,
1008                               0, &error);
1009         if (ip == NULL) {
1010                 *vpp = NULL;
1011         } else {
1012                 error = hammer_get_vnode(ip, vpp);
1013                 hammer_rel_inode(ip, 0);
1014         }
1015         hammer_done_transaction(&trans);
1016         lwkt_reltoken(&hmp->fs_token);
1017         return (error);
1018 }
1019
1020 /*
1021  * Return the root vnode for the filesystem.
1022  *
1023  * HAMMER stores the root vnode in the hammer_mount structure so
1024  * getting it is easy.
1025  */
1026 static int
1027 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1028 {
1029         int error;
1030
1031         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp);
1032         return (error);
1033 }
1034
1035 static int
1036 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1037 {
1038         struct hammer_mount *hmp = (void *)mp->mnt_data;
1039         hammer_volume_t volume;
1040         hammer_volume_ondisk_t ondisk;
1041         int error;
1042         int64_t bfree;
1043         int64_t breserved;
1044
1045         lwkt_gettoken(&hmp->fs_token);
1046         volume = hammer_get_root_volume(hmp, &error);
1047         if (error) {
1048                 lwkt_reltoken(&hmp->fs_token);
1049                 return(error);
1050         }
1051         ondisk = volume->ondisk;
1052
1053         /*
1054          * Basic stats
1055          */
1056         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1057         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1058         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1059         hammer_rel_volume(volume, 0);
1060
1061         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1062         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1063         if (mp->mnt_stat.f_files < 0)
1064                 mp->mnt_stat.f_files = 0;
1065
1066         *sbp = mp->mnt_stat;
1067         lwkt_reltoken(&hmp->fs_token);
1068         return(0);
1069 }
1070
1071 static int
1072 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1073 {
1074         struct hammer_mount *hmp = (void *)mp->mnt_data;
1075         hammer_volume_t volume;
1076         hammer_volume_ondisk_t ondisk;
1077         int error;
1078         int64_t bfree;
1079         int64_t breserved;
1080
1081         lwkt_gettoken(&hmp->fs_token);
1082         volume = hammer_get_root_volume(hmp, &error);
1083         if (error) {
1084                 lwkt_reltoken(&hmp->fs_token);
1085                 return(error);
1086         }
1087         ondisk = volume->ondisk;
1088
1089         /*
1090          * Basic stats
1091          */
1092         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1093         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1094         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1095         hammer_rel_volume(volume, 0);
1096
1097         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1098         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1099         if (mp->mnt_vstat.f_files < 0)
1100                 mp->mnt_vstat.f_files = 0;
1101         *sbp = mp->mnt_vstat;
1102         lwkt_reltoken(&hmp->fs_token);
1103         return(0);
1104 }
1105
1106 /*
1107  * Sync the filesystem.  Currently we have to run it twice, the second
1108  * one will advance the undo start index to the end index, so if a crash
1109  * occurs no undos will be run on mount.
1110  *
1111  * We do not sync the filesystem if we are called from a panic.  If we did
1112  * we might end up blowing up a sync that was already in progress.
1113  */
1114 static int
1115 hammer_vfs_sync(struct mount *mp, int waitfor)
1116 {
1117         struct hammer_mount *hmp = (void *)mp->mnt_data;
1118         int error;
1119
1120         lwkt_gettoken(&hmp->fs_token);
1121         if (panicstr == NULL) {
1122                 error = hammer_sync_hmp(hmp, waitfor);
1123         } else {
1124                 error = EIO;
1125         }
1126         lwkt_reltoken(&hmp->fs_token);
1127         return (error);
1128 }
1129
1130 /*
1131  * Convert a vnode to a file handle.
1132  *
1133  * Accesses read-only fields on already-referenced structures so
1134  * no token is needed.
1135  */
1136 static int
1137 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1138 {
1139         hammer_inode_t ip;
1140
1141         KKASSERT(MAXFIDSZ >= 16);
1142         ip = VTOI(vp);
1143         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1144         fhp->fid_ext = ip->obj_localization >> 16;
1145         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1146         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1147         return(0);
1148 }
1149
1150
1151 /*
1152  * Convert a file handle back to a vnode.
1153  *
1154  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1155  * null mount.
1156  */
1157 static int
1158 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1159                   struct fid *fhp, struct vnode **vpp)
1160 {
1161         hammer_mount_t hmp = (void *)mp->mnt_data;
1162         struct hammer_transaction trans;
1163         struct hammer_inode *ip;
1164         struct hammer_inode_info info;
1165         int error;
1166         u_int32_t localization;
1167
1168         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1169         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1170         if (rootvp)
1171                 localization = VTOI(rootvp)->obj_localization;
1172         else
1173                 localization = (u_int32_t)fhp->fid_ext << 16;
1174
1175         lwkt_gettoken(&hmp->fs_token);
1176         hammer_simple_transaction(&trans, hmp);
1177
1178         /*
1179          * Get/allocate the hammer_inode structure.  The structure must be
1180          * unlocked while we manipulate the related vnode to avoid a
1181          * deadlock.
1182          */
1183         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1184                               info.obj_asof, localization, 0, &error);
1185         if (ip) {
1186                 error = hammer_get_vnode(ip, vpp);
1187                 hammer_rel_inode(ip, 0);
1188         } else {
1189                 *vpp = NULL;
1190         }
1191         hammer_done_transaction(&trans);
1192         lwkt_reltoken(&hmp->fs_token);
1193         return (error);
1194 }
1195
1196 static int
1197 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1198                     int *exflagsp, struct ucred **credanonp)
1199 {
1200         hammer_mount_t hmp = (void *)mp->mnt_data;
1201         struct netcred *np;
1202         int error;
1203
1204         lwkt_gettoken(&hmp->fs_token);
1205         np = vfs_export_lookup(mp, &hmp->export, nam);
1206         if (np) {
1207                 *exflagsp = np->netc_exflags;
1208                 *credanonp = &np->netc_anon;
1209                 error = 0;
1210         } else {
1211                 error = EACCES;
1212         }
1213         lwkt_reltoken(&hmp->fs_token);
1214         return (error);
1215
1216 }
1217
1218 int
1219 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1220 {
1221         hammer_mount_t hmp = (void *)mp->mnt_data;
1222         int error;
1223
1224         lwkt_gettoken(&hmp->fs_token);
1225
1226         switch(op) {
1227         case MOUNTCTL_SET_EXPORT:
1228                 error = vfs_export(mp, &hmp->export, export);
1229                 break;
1230         default:
1231                 error = EOPNOTSUPP;
1232                 break;
1233         }
1234         lwkt_reltoken(&hmp->fs_token);
1235
1236         return(error);
1237 }
1238