sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42 #include <sys/malloc.h>
  43 #include <sys/nlookup.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/buf.h>
  47 #include <sys/buf2.h>
  48 #include "hammer.h"
  49
  50 /*
  51  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  52  *        in conditionals.
  53  */
  54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  55 int hammer_debug_io;
  56 int hammer_debug_general;
  57 int hammer_debug_debug = 1;             /* medium-error panics */
  58 int hammer_debug_inode;
  59 int hammer_debug_locks;
  60 int hammer_debug_btree;
  61 int hammer_debug_tid;
  62 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  63 int hammer_debug_recover_faults;
  64 int hammer_debug_critical;              /* non-zero enter debugger on error */
  65 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  66 int hammer_live_dedup = 0;
  67 int hammer_count_fsyncs;
  68 int hammer_count_inodes;
  69 int hammer_count_iqueued;
  70 int hammer_count_reclaiming;
  71 int hammer_count_records;
  72 int hammer_count_record_datas;
  73 int hammer_count_volumes;
  74 int hammer_count_buffers;
  75 int hammer_count_nodes;
  76 int64_t hammer_count_extra_space_used;
  77 int64_t hammer_stats_btree_lookups;
  78 int64_t hammer_stats_btree_searches;
  79 int64_t hammer_stats_btree_inserts;
  80 int64_t hammer_stats_btree_deletes;
  81 int64_t hammer_stats_btree_elements;
  82 int64_t hammer_stats_btree_splits;
  83 int64_t hammer_stats_btree_iterations;
  84 int64_t hammer_stats_btree_root_iterations;
  85 int64_t hammer_stats_record_iterations;
  86
  87 int64_t hammer_stats_file_read;
  88 int64_t hammer_stats_file_write;
  89 int64_t hammer_stats_file_iopsr;
  90 int64_t hammer_stats_file_iopsw;
  91 int64_t hammer_stats_disk_read;
  92 int64_t hammer_stats_disk_write;
  93 int64_t hammer_stats_inode_flushes;
  94 int64_t hammer_stats_commits;
  95 int64_t hammer_stats_undo;
  96 int64_t hammer_stats_redo;
  97
  98 int hammer_count_dirtybufspace;         /* global */
  99 int hammer_count_refedbufs;             /* global */
 100 int hammer_count_reservations;
 101 int hammer_count_io_running_read;
 102 int hammer_count_io_running_write;
 103 int hammer_count_io_locked;
 104 int hammer_limit_dirtybufspace;         /* per-mount */
 105 int hammer_limit_running_io;            /* per-mount */
 106 int hammer_limit_recs;                  /* as a whole XXX */
 107 int hammer_limit_inode_recs = 2048;     /* per inode */
 108 int hammer_limit_reclaim;
 109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
 110 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 111 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
 112 int hammer_bio_count;
 113 int hammer_verify_zone;
 114 int hammer_verify_data = 1;
 115 int hammer_write_mode;
 116 int hammer_double_buffer;
 117 int hammer_yield_check = 16;
 118 int hammer_fsync_mode = 3;
 119 int64_t hammer_contention_count;
 120 int64_t hammer_zone_limit;
 121
 122 /*
 123  * Live dedup debug counters (sysctls are writable so that counters
 124  * can be reset from userspace).
 125  */
 126 int64_t hammer_live_dedup_vnode_bcmps = 0;
 127 int64_t hammer_live_dedup_device_bcmps = 0;
 128 int64_t hammer_live_dedup_findblk_failures = 0;
 129 int64_t hammer_live_dedup_bmap_saves = 0;
 130
 131
 132 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 133
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 135            &hammer_supported_version, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 137            &hammer_debug_general, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 139            &hammer_debug_io, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 141            &hammer_debug_debug, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 143            &hammer_debug_inode, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 145            &hammer_debug_locks, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 147            &hammer_debug_btree, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 149            &hammer_debug_tid, 0, "");
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 151            &hammer_debug_recover, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 153            &hammer_debug_recover_faults, 0, "");
 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 155            &hammer_debug_critical, 0, "");
 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 157            &hammer_cluster_enable, 0, "");
 158 /*
 159  * 0 - live dedup is disabled
 160  * 1 - dedup cache is populated on reads only
 161  * 2 - dedup cache is populated on both reads and writes
 162  */
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
 164            &hammer_live_dedup, 0, "Enable live dedup");
 165
 166 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 167            &hammer_limit_dirtybufspace, 0, "");
 168 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
 169            &hammer_limit_running_io, 0, "");
 170 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 171            &hammer_limit_recs, 0, "");
 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 173            &hammer_limit_inode_recs, 0, "");
 174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 175            &hammer_limit_reclaim, 0, "");
 176 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 177            &hammer_live_dedup_cache_size, 0,
 178            "Number of cache entries");
 179 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 180            &hammer_limit_redo, 0, "");
 181
 182 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 183            &hammer_count_fsyncs, 0, "");
 184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 185            &hammer_count_inodes, 0, "");
 186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 187            &hammer_count_iqueued, 0, "");
 188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 189            &hammer_count_reclaiming, 0, "");
 190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 191            &hammer_count_records, 0, "");
 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 193            &hammer_count_record_datas, 0, "");
 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 195            &hammer_count_volumes, 0, "");
 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 197            &hammer_count_buffers, 0, "");
 198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 199            &hammer_count_nodes, 0, "");
 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 201            &hammer_count_extra_space_used, 0, "");
 202
 203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 204            &hammer_stats_btree_searches, 0, "");
 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 206            &hammer_stats_btree_lookups, 0, "");
 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 208            &hammer_stats_btree_inserts, 0, "");
 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 210            &hammer_stats_btree_deletes, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 212            &hammer_stats_btree_elements, 0, "");
 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 214            &hammer_stats_btree_splits, 0, "");
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 216            &hammer_stats_btree_iterations, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 218            &hammer_stats_btree_root_iterations, 0, "");
 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 220            &hammer_stats_record_iterations, 0, "");
 221
 222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 223            &hammer_stats_file_read, 0, "");
 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 225            &hammer_stats_file_write, 0, "");
 226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 227            &hammer_stats_file_iopsr, 0, "");
 228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 229            &hammer_stats_file_iopsw, 0, "");
 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 231            &hammer_stats_disk_read, 0, "");
 232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 233            &hammer_stats_disk_write, 0, "");
 234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 235            &hammer_stats_inode_flushes, 0, "");
 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 237            &hammer_stats_commits, 0, "");
 238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 239            &hammer_stats_undo, 0, "");
 240 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 241            &hammer_stats_redo, 0, "");
 242
 243 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 244             &hammer_live_dedup_vnode_bcmps, 0,
 245             "successful vnode buffer comparisons");
 246 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 247             &hammer_live_dedup_device_bcmps, 0,
 248             "successful device buffer comparisons");
 249 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 250             &hammer_live_dedup_findblk_failures, 0,
 251             "block lookup failures for comparison");
 252 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 253             &hammer_live_dedup_bmap_saves, 0,
 254             "useful physical block lookups");
 255
 256 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 257            &hammer_count_dirtybufspace, 0, "");
 258 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 259            &hammer_count_refedbufs, 0, "");
 260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 261            &hammer_count_reservations, 0, "");
 262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 263            &hammer_count_io_running_read, 0, "");
 264 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 265            &hammer_count_io_locked, 0, "");
 266 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 267            &hammer_count_io_running_write, 0, "");
 268 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 269            &hammer_zone_limit, 0, "");
 270 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 271            &hammer_contention_count, 0, "");
 272 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 273            &hammer_autoflush, 0, "");
 274 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 275            &hammer_verify_zone, 0, "");
 276 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 277            &hammer_verify_data, 0, "");
 278 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 279            &hammer_write_mode, 0, "");
 280 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 281            &hammer_double_buffer, 0, "");
 282 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 283            &hammer_yield_check, 0, "");
 284 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 285            &hammer_fsync_mode, 0, "");
 286
 287 KTR_INFO_MASTER(hammer);
 288
 289 /*
 290  * VFS ABI
 291  */
 292 static void     hammer_free_hmp(struct mount *mp);
 293
 294 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 295                                 struct ucred *cred);
 296 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 297 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 298 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 299                                 struct ucred *cred);
 300 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 301                                 struct ucred *cred);
 302 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 303 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 304                                 ino_t ino, struct vnode **vpp);
 305 static int      hammer_vfs_init(struct vfsconf *conf);
 306 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 307                                 struct fid *fhp, struct vnode **vpp);
 308 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 309 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 310                                 int *exflagsp, struct ucred **credanonp);
 311
 312
 313 static struct vfsops hammer_vfsops = {
 314         .vfs_mount      = hammer_vfs_mount,
 315         .vfs_unmount    = hammer_vfs_unmount,
 316         .vfs_root       = hammer_vfs_root,
 317         .vfs_statfs     = hammer_vfs_statfs,
 318         .vfs_statvfs    = hammer_vfs_statvfs,
 319         .vfs_sync       = hammer_vfs_sync,
 320         .vfs_vget       = hammer_vfs_vget,
 321         .vfs_init       = hammer_vfs_init,
 322         .vfs_vptofh     = hammer_vfs_vptofh,
 323         .vfs_fhtovp     = hammer_vfs_fhtovp,
 324         .vfs_checkexp   = hammer_vfs_checkexp
 325 };
 326
 327 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 328
 329 VFS_SET(hammer_vfsops, hammer, 0);
 330 MODULE_VERSION(hammer, 1);
 331
 332 static int
 333 hammer_vfs_init(struct vfsconf *conf)
 334 {
 335         int n;
 336
 337         if (hammer_limit_recs == 0) {
 338                 hammer_limit_recs = nbuf * 25;
 339                 n = kmalloc_limit(M_HAMMER) / 512;
 340                 if (hammer_limit_recs > n)
 341                         hammer_limit_recs = n;
 342         }
 343         if (hammer_limit_dirtybufspace == 0) {
 344                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 345                 if (hammer_limit_dirtybufspace < 100)
 346                         hammer_limit_dirtybufspace = 100;
 347         }
 348
 349         /*
 350          * Set reasonable limits to maintain an I/O pipeline.  This is
 351          * used by the flush code which explicitly initiates I/O, and
 352          * is per-mount.
 353          *
 354          * The system-driven buffer cache uses vfs.lorunningspace and
 355          * vfs.hirunningspace globally.
 356          */
 357         if (hammer_limit_running_io == 0)
 358                 hammer_limit_running_io = hammer_limit_dirtybufspace;
 359         if (hammer_limit_running_io > 10 * 1024 * 1024)
 360                 hammer_limit_running_io = 10 * 1024 * 1024;
 361
 362         /*
 363          * The hammer_inode structure detaches from the vnode on reclaim.
 364          * This limits the number of inodes in this state to prevent a
 365          * memory pool blowout.
 366          */
 367         if (hammer_limit_reclaim == 0)
 368                 hammer_limit_reclaim = desiredvnodes / 10;
 369
 370         return(0);
 371 }
 372
 373 static int
 374 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 375                  struct ucred *cred)
 376 {
 377         struct hammer_mount_info info;
 378         hammer_mount_t hmp;
 379         hammer_volume_t rootvol;
 380         struct vnode *rootvp;
 381         struct vnode *devvp = NULL;
 382         const char *upath;      /* volume name in userspace */
 383         char *path;             /* volume name in system space */
 384         int error;
 385         int i;
 386         int master_id;
 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 >= 32768)
 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                 /*TAILQ_INIT(&hmp->recycle_list);*/
 453
 454                 /*
 455                  * Make sure kmalloc type limits are set appropriately.
 456                  *
 457                  * Our inode kmalloc group is sized based on maxvnodes
 458                  * (controlled by the system, not us).
 459                  */
 460                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 461                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 462
 463                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 464
 465                 hmp->root_btree_beg.localization = 0x00000000U;
 466                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 467                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 468                 hmp->root_btree_beg.create_tid = 1;
 469                 hmp->root_btree_beg.delete_tid = 1;
 470                 hmp->root_btree_beg.rec_type = 0;
 471                 hmp->root_btree_beg.obj_type = 0;
 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
 481                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 482                 hmp->krate.count = -16; /* initial burst */
 483
 484                 hmp->sync_lock.refs = 1;
 485                 hmp->free_lock.refs = 1;
 486                 hmp->undo_lock.refs = 1;
 487                 hmp->blkmap_lock.refs = 1;
 488                 hmp->snapshot_lock.refs = 1;
 489                 hmp->volume_lock.refs = 1;
 490
 491                 TAILQ_INIT(&hmp->delay_list);
 492                 TAILQ_INIT(&hmp->flush_group_list);
 493                 TAILQ_INIT(&hmp->objid_cache_list);
 494                 TAILQ_INIT(&hmp->undo_lru_list);
 495                 TAILQ_INIT(&hmp->reclaim_list);
 496
 497                 RB_INIT(&hmp->rb_dedup_crc_root);
 498                 RB_INIT(&hmp->rb_dedup_off_root);
 499                 TAILQ_INIT(&hmp->dedup_lru_list);
 500         }
 501         hmp->hflags &= ~HMNT_USERFLAGS;
 502         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 503
 504         hmp->master_id = master_id;
 505
 506         if (info.asof) {
 507                 mp->mnt_flag |= MNT_RDONLY;
 508                 hmp->asof = info.asof;
 509         } else {
 510                 hmp->asof = HAMMER_MAX_TID;
 511         }
 512
 513         hmp->volume_to_remove = -1;
 514
 515         /*
 516          * Re-open read-write if originally read-only, or vise-versa.
 517          *
 518          * When going from read-only to read-write execute the stage2
 519          * recovery if it has not already been run.
 520          */
 521         if (mp->mnt_flag & MNT_UPDATE) {
 522                 lwkt_gettoken(&hmp->fs_token);
 523                 error = 0;
 524                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 525                         kprintf("HAMMER read-only -> read-write\n");
 526                         hmp->ronly = 0;
 527                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 528                                 hammer_adjust_volume_mode, NULL);
 529                         rootvol = hammer_get_root_volume(hmp, &error);
 530                         if (rootvol) {
 531                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 532                                 error = hammer_recover_stage2(hmp, rootvol);
 533                                 bcopy(rootvol->ondisk->vol0_blockmap,
 534                                       hmp->blockmap,
 535                                       sizeof(hmp->blockmap));
 536                                 hammer_rel_volume(rootvol, 0);
 537                         }
 538                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 539                                 hammer_reload_inode, NULL);
 540                         /* kernel clears MNT_RDONLY */
 541                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 542                         kprintf("HAMMER read-write -> read-only\n");
 543                         hmp->ronly = 1; /* messy */
 544                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 545                                 hammer_reload_inode, NULL);
 546                         hmp->ronly = 0;
 547                         hammer_flusher_sync(hmp);
 548                         hammer_flusher_sync(hmp);
 549                         hammer_flusher_sync(hmp);
 550                         hmp->ronly = 1;
 551                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 552                                 hammer_adjust_volume_mode, NULL);
 553                 }
 554                 lwkt_reltoken(&hmp->fs_token);
 555                 return(error);
 556         }
 557
 558         RB_INIT(&hmp->rb_vols_root);
 559         RB_INIT(&hmp->rb_inos_root);
 560         RB_INIT(&hmp->rb_redo_root);
 561         RB_INIT(&hmp->rb_nods_root);
 562         RB_INIT(&hmp->rb_undo_root);
 563         RB_INIT(&hmp->rb_resv_root);
 564         RB_INIT(&hmp->rb_bufs_root);
 565         RB_INIT(&hmp->rb_pfsm_root);
 566
 567         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 568
 569         RB_INIT(&hmp->volu_root);
 570         RB_INIT(&hmp->undo_root);
 571         RB_INIT(&hmp->data_root);
 572         RB_INIT(&hmp->meta_root);
 573         RB_INIT(&hmp->lose_root);
 574         TAILQ_INIT(&hmp->iorun_list);
 575
 576         lwkt_token_init(&hmp->fs_token, "hammerfs");
 577         lwkt_token_init(&hmp->io_token, "hammerio");
 578
 579         lwkt_gettoken(&hmp->fs_token);
 580
 581         /*
 582          * Load volumes
 583          */
 584         path = objcache_get(namei_oc, M_WAITOK);
 585         hmp->nvolumes = -1;
 586         for (i = 0; i < info.nvolumes; ++i) {
 587                 if (mntpt == NULL) {
 588                         /*
 589                          * Root mount.
 590                          */
 591                         KKASSERT(next_volume_ptr != NULL);
 592                         strcpy(path, "");
 593                         if (*next_volume_ptr != '/') {
 594                                 /* relative path */
 595                                 strcpy(path, "/dev/");
 596                         }
 597                         int k;
 598                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 599                                 if (*next_volume_ptr == '\0') {
 600                                         break;
 601                                 } else if (*next_volume_ptr == ':') {
 602                                         ++next_volume_ptr;
 603                                         break;
 604                                 } else {
 605                                         path[k] = *next_volume_ptr;
 606                                         ++next_volume_ptr;
 607                                 }
 608                         }
 609                         path[k] = '\0';
 610
 611                         error = 0;
 612                         cdev_t dev = kgetdiskbyname(path);
 613                         error = bdevvp(dev, &devvp);
 614                         if (error) {
 615                                 kprintf("hammer_mountroot: can't find devvp\n");
 616                         }
 617                 } else {
 618                         error = copyin(&info.volumes[i], &upath,
 619                                        sizeof(char *));
 620                         if (error == 0)
 621                                 error = copyinstr(upath, path,
 622                                                   MAXPATHLEN, NULL);
 623                 }
 624                 if (error == 0)
 625                         error = hammer_install_volume(hmp, path, devvp);
 626                 if (error)
 627                         break;
 628         }
 629         objcache_put(namei_oc, path);
 630
 631         /*
 632          * Make sure we found a root volume
 633          */
 634         if (error == 0 && hmp->rootvol == NULL) {
 635                 kprintf("hammer_mount: No root volume found!\n");
 636                 error = EINVAL;
 637         }
 638
 639         /*
 640          * Check that all required volumes are available
 641          */
 642         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 643                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 644                 error = EINVAL;
 645         }
 646
 647         if (error) {
 648                 /* called with fs_token held */
 649                 hammer_free_hmp(mp);
 650                 return (error);
 651         }
 652
 653         /*
 654          * No errors, setup enough of the mount point so we can lookup the
 655          * root vnode.
 656          */
 657         mp->mnt_iosize_max = MAXPHYS;
 658         mp->mnt_kern_flag |= MNTK_FSMID;
 659
 660         /*
 661          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 662          * will acquire a per-mount token prior to entry and release it
 663          * on return, so even if we do not specify it we no longer get
 664          * the BGL regardlless of how we are flagged.
 665          */
 666         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 667         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
 668
 669         /*
 670          * note: f_iosize is used by vnode_pager_haspage() when constructing
 671          * its VOP_BMAP call.
 672          */
 673         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 674         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 675
 676         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 677         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 678
 679         mp->mnt_maxsymlinklen = 255;
 680         mp->mnt_flag |= MNT_LOCAL;
 681
 682         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 683         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 684         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 685
 686         /*
 687          * The root volume's ondisk pointer is only valid if we hold a
 688          * reference to it.
 689          */
 690         rootvol = hammer_get_root_volume(hmp, &error);
 691         if (error)
 692                 goto failed;
 693
 694         /*
 695          * Perform any necessary UNDO operations.  The recovery code does
 696          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 697          * and then re-copy it again after recovery is complete.
 698          *
 699          * If this is a read-only mount the UNDO information is retained
 700          * in memory in the form of dirty buffer cache buffers, and not
 701          * written back to the media.
 702          */
 703         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 704               sizeof(hmp->blockmap));
 705
 706         /*
 707          * Check filesystem version
 708          */
 709         hmp->version = rootvol->ondisk->vol_version;
 710         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 711             hmp->version > HAMMER_VOL_VERSION_MAX) {
 712                 kprintf("HAMMER: mount unsupported fs version %d\n",
 713                         hmp->version);
 714                 error = ERANGE;
 715                 goto done;
 716         }
 717
 718         /*
 719          * The undo_rec_limit limits the size of flush groups to avoid
 720          * blowing out the UNDO FIFO.  This calculation is typically in
 721          * the tens of thousands and is designed primarily when small
 722          * HAMMER filesystems are created.
 723          */
 724         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 725         if (hammer_debug_general & 0x0001)
 726                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 727
 728         /*
 729          * NOTE: Recover stage1 not only handles meta-data recovery, it
 730          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 731          */
 732         error = hammer_recover_stage1(hmp, rootvol);
 733         if (error) {
 734                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 735                 goto done;
 736         }
 737
 738         /*
 739          * Finish setup now that we have a good root volume.
 740          *
 741          * The top 16 bits of fsid.val[1] is a pfs id.
 742          */
 743         ksnprintf(mp->mnt_stat.f_mntfromname,
 744                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 745                   rootvol->ondisk->vol_name);
 746         mp->mnt_stat.f_fsid.val[0] =
 747                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 748         mp->mnt_stat.f_fsid.val[1] =
 749                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 750         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 751
 752         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 753         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 754                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 755
 756         /*
 757          * Certain often-modified fields in the root volume are cached in
 758          * the hammer_mount structure so we do not have to generate lots
 759          * of little UNDO structures for them.
 760          *
 761          * Recopy after recovery.  This also has the side effect of
 762          * setting our cached undo FIFO's first_offset, which serves to
 763          * placemark the FIFO start for the NEXT flush cycle while the
 764          * on-disk first_offset represents the LAST flush cycle.
 765          */
 766         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 767         hmp->flush_tid1 = hmp->next_tid;
 768         hmp->flush_tid2 = hmp->next_tid;
 769         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 770               sizeof(hmp->blockmap));
 771         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 772
 773         hammer_flusher_create(hmp);
 774
 775         /*
 776          * Locate the root directory using the root cluster's B-Tree as a
 777          * starting point.  The root directory uses an obj_id of 1.
 778          *
 779          * FUTURE: Leave the root directory cached referenced but unlocked
 780          * in hmp->rootvp (need to flush it on unmount).
 781          */
 782         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 783         if (error)
 784                 goto done;
 785         vput(rootvp);
 786         /*vn_unlock(hmp->rootvp);*/
 787         if (hmp->ronly == 0)
 788                 error = hammer_recover_stage2(hmp, rootvol);
 789
 790         /*
 791          * If the stage2 recovery fails be sure to clean out all cached
 792          * vnodes before throwing away the mount structure or bad things
 793          * will happen.
 794          */
 795         if (error)
 796                 vflush(mp, 0, 0);
 797
 798 done:
 799         hammer_rel_volume(rootvol, 0);
 800 failed:
 801         /*
 802          * Cleanup and return.
 803          */
 804         if (error) {
 805                 /* called with fs_token held */
 806                 hammer_free_hmp(mp);
 807         } else {
 808                 lwkt_reltoken(&hmp->fs_token);
 809         }
 810         return (error);
 811 }
 812
 813 static int
 814 hammer_vfs_unmount(struct mount *mp, int mntflags)
 815 {
 816         hammer_mount_t hmp = (void *)mp->mnt_data;
 817         int flags;
 818         int error;
 819
 820         /*
 821          * Clean out the vnodes
 822          */
 823         lwkt_gettoken(&hmp->fs_token);
 824         flags = 0;
 825         if (mntflags & MNT_FORCE)
 826                 flags |= FORCECLOSE;
 827         error = vflush(mp, 0, flags);
 828
 829         /*
 830          * Clean up the internal mount structure and related entities.  This
 831          * may issue I/O.
 832          */
 833         if (error == 0) {
 834                 /* called with fs_token held */
 835                 hammer_free_hmp(mp);
 836         } else {
 837                 lwkt_reltoken(&hmp->fs_token);
 838         }
 839         return(error);
 840 }
 841
 842 /*
 843  * Clean up the internal mount structure and disassociate it from the mount.
 844  * This may issue I/O.
 845  *
 846  * Called with fs_token held.
 847  */
 848 static void
 849 hammer_free_hmp(struct mount *mp)
 850 {
 851         hammer_mount_t hmp = (void *)mp->mnt_data;
 852         hammer_flush_group_t flg;
 853         int count;
 854         int dummy;
 855
 856         /*
 857          * Flush anything dirty.  This won't even run if the
 858          * filesystem errored-out.
 859          */
 860         count = 0;
 861         while (hammer_flusher_haswork(hmp)) {
 862                 hammer_flusher_sync(hmp);
 863                 ++count;
 864                 if (count >= 5) {
 865                         if (count == 5)
 866                                 kprintf("HAMMER: umount flushing.");
 867                         else
 868                                 kprintf(".");
 869                         tsleep(&dummy, 0, "hmrufl", hz);
 870                 }
 871                 if (count == 30) {
 872                         kprintf("giving up\n");
 873                         break;
 874                 }
 875         }
 876         if (count >= 5 && count < 30)
 877                 kprintf("\n");
 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                         kprintf("HAMMER: 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         krateprintf(&hmp->krate,
 948                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 949                     hmp->mp->mnt_stat.f_mntfromname,
 950                     (intmax_t)(ip ? ip->obj_id : -1),
 951                     error, msg);
 952
 953         if (hmp->ronly == 0) {
 954                 hmp->ronly = 2;         /* special errored read-only mode */
 955                 hmp->mp->mnt_flag |= MNT_RDONLY;
 956                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 957                         hammer_adjust_volume_mode, NULL);
 958                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 959                         hmp->mp->mnt_stat.f_mntfromname);
 960         }
 961         hmp->error = error;
 962         if (hammer_debug_critical)
 963                 Debugger("Entering debugger");
 964 }
 965
 966
 967 /*
 968  * Obtain a vnode for the specified inode number.  An exclusively locked
 969  * vnode is returned.
 970  */
 971 int
 972 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 973                 ino_t ino, struct vnode **vpp)
 974 {
 975         struct hammer_transaction trans;
 976         struct hammer_mount *hmp = (void *)mp->mnt_data;
 977         struct hammer_inode *ip;
 978         int error;
 979         u_int32_t localization;
 980
 981         lwkt_gettoken(&hmp->fs_token);
 982         hammer_simple_transaction(&trans, hmp);
 983
 984         /*
 985          * If a directory vnode is supplied (mainly NFS) then we can acquire
 986          * the PFS domain from it.  Otherwise we would only be able to vget
 987          * inodes in the root PFS.
 988          */
 989         if (dvp) {
 990                 localization = HAMMER_DEF_LOCALIZATION +
 991                                 VTOI(dvp)->obj_localization;
 992         } else {
 993                 localization = HAMMER_DEF_LOCALIZATION;
 994         }
 995
 996         /*
 997          * Lookup the requested HAMMER inode.  The structure must be
 998          * left unlocked while we manipulate the related vnode to avoid
 999          * a deadlock.
1000          */
1001         ip = hammer_get_inode(&trans, NULL, ino,
1002                               hmp->asof, localization,
1003                               0, &error);
1004         if (ip == NULL) {
1005                 *vpp = NULL;
1006         } else {
1007                 error = hammer_get_vnode(ip, vpp);
1008                 hammer_rel_inode(ip, 0);
1009         }
1010         hammer_done_transaction(&trans);
1011         lwkt_reltoken(&hmp->fs_token);
1012         return (error);
1013 }
1014
1015 /*
1016  * Return the root vnode for the filesystem.
1017  *
1018  * HAMMER stores the root vnode in the hammer_mount structure so
1019  * getting it is easy.
1020  */
1021 static int
1022 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1023 {
1024         int error;
1025
1026         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1027         return (error);
1028 }
1029
1030 static int
1031 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1032 {
1033         struct hammer_mount *hmp = (void *)mp->mnt_data;
1034         hammer_volume_t volume;
1035         hammer_volume_ondisk_t ondisk;
1036         int error;
1037         int64_t bfree;
1038         int64_t breserved;
1039
1040         lwkt_gettoken(&hmp->fs_token);
1041         volume = hammer_get_root_volume(hmp, &error);
1042         if (error) {
1043                 lwkt_reltoken(&hmp->fs_token);
1044                 return(error);
1045         }
1046         ondisk = volume->ondisk;
1047
1048         /*
1049          * Basic stats
1050          */
1051         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1052         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1053         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1054         hammer_rel_volume(volume, 0);
1055
1056         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1057         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1058         if (mp->mnt_stat.f_files < 0)
1059                 mp->mnt_stat.f_files = 0;
1060
1061         *sbp = mp->mnt_stat;
1062         lwkt_reltoken(&hmp->fs_token);
1063         return(0);
1064 }
1065
1066 static int
1067 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1068 {
1069         struct hammer_mount *hmp = (void *)mp->mnt_data;
1070         hammer_volume_t volume;
1071         hammer_volume_ondisk_t ondisk;
1072         int error;
1073         int64_t bfree;
1074         int64_t breserved;
1075
1076         lwkt_gettoken(&hmp->fs_token);
1077         volume = hammer_get_root_volume(hmp, &error);
1078         if (error) {
1079                 lwkt_reltoken(&hmp->fs_token);
1080                 return(error);
1081         }
1082         ondisk = volume->ondisk;
1083
1084         /*
1085          * Basic stats
1086          */
1087         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1088         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1089         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1090         hammer_rel_volume(volume, 0);
1091
1092         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1093         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1094         if (mp->mnt_vstat.f_files < 0)
1095                 mp->mnt_vstat.f_files = 0;
1096         *sbp = mp->mnt_vstat;
1097         lwkt_reltoken(&hmp->fs_token);
1098         return(0);
1099 }
1100
1101 /*
1102  * Sync the filesystem.  Currently we have to run it twice, the second
1103  * one will advance the undo start index to the end index, so if a crash
1104  * occurs no undos will be run on mount.
1105  *
1106  * We do not sync the filesystem if we are called from a panic.  If we did
1107  * we might end up blowing up a sync that was already in progress.
1108  */
1109 static int
1110 hammer_vfs_sync(struct mount *mp, int waitfor)
1111 {
1112         struct hammer_mount *hmp = (void *)mp->mnt_data;
1113         int error;
1114
1115         lwkt_gettoken(&hmp->fs_token);
1116         if (panicstr == NULL) {
1117                 error = hammer_sync_hmp(hmp, waitfor);
1118         } else {
1119                 error = EIO;
1120         }
1121         lwkt_reltoken(&hmp->fs_token);
1122         return (error);
1123 }
1124
1125 /*
1126  * Convert a vnode to a file handle.
1127  *
1128  * Accesses read-only fields on already-referenced structures so
1129  * no token is needed.
1130  */
1131 static int
1132 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1133 {
1134         hammer_inode_t ip;
1135
1136         KKASSERT(MAXFIDSZ >= 16);
1137         ip = VTOI(vp);
1138         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1139         fhp->fid_ext = ip->obj_localization >> 16;
1140         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1141         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1142         return(0);
1143 }
1144
1145
1146 /*
1147  * Convert a file handle back to a vnode.
1148  *
1149  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1150  * null mount.
1151  */
1152 static int
1153 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1154                   struct fid *fhp, struct vnode **vpp)
1155 {
1156         hammer_mount_t hmp = (void *)mp->mnt_data;
1157         struct hammer_transaction trans;
1158         struct hammer_inode *ip;
1159         struct hammer_inode_info info;
1160         int error;
1161         u_int32_t localization;
1162
1163         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1164         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1165         if (rootvp)
1166                 localization = VTOI(rootvp)->obj_localization;
1167         else
1168                 localization = (u_int32_t)fhp->fid_ext << 16;
1169
1170         lwkt_gettoken(&hmp->fs_token);
1171         hammer_simple_transaction(&trans, hmp);
1172
1173         /*
1174          * Get/allocate the hammer_inode structure.  The structure must be
1175          * unlocked while we manipulate the related vnode to avoid a
1176          * deadlock.
1177          */
1178         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1179                               info.obj_asof, localization, 0, &error);
1180         if (ip) {
1181                 error = hammer_get_vnode(ip, vpp);
1182                 hammer_rel_inode(ip, 0);
1183         } else {
1184                 *vpp = NULL;
1185         }
1186         hammer_done_transaction(&trans);
1187         lwkt_reltoken(&hmp->fs_token);
1188         return (error);
1189 }
1190
1191 static int
1192 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1193                     int *exflagsp, struct ucred **credanonp)
1194 {
1195         hammer_mount_t hmp = (void *)mp->mnt_data;
1196         struct netcred *np;
1197         int error;
1198
1199         lwkt_gettoken(&hmp->fs_token);
1200         np = vfs_export_lookup(mp, &hmp->export, nam);
1201         if (np) {
1202                 *exflagsp = np->netc_exflags;
1203                 *credanonp = &np->netc_anon;
1204                 error = 0;
1205         } else {
1206                 error = EACCES;
1207         }
1208         lwkt_reltoken(&hmp->fs_token);
1209         return (error);
1210
1211 }
1212
1213 int
1214 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1215 {
1216         hammer_mount_t hmp = (void *)mp->mnt_data;
1217         int error;
1218
1219         lwkt_gettoken(&hmp->fs_token);
1220
1221         switch(op) {
1222         case MOUNTCTL_SET_EXPORT:
1223                 error = vfs_export(mp, &hmp->export, export);
1224                 break;
1225         default:
1226                 error = EOPNOTSUPP;
1227                 break;
1228         }
1229         lwkt_reltoken(&hmp->fs_token);
1230
1231         return(error);
1232 }
1233