sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/mountctl.h>
  36
  37 #include "hammer.h"
  38
  39 /*
  40  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  41  *        in conditionals.
  42  */
  43 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  44 int hammer_debug_io;
  45 int hammer_debug_general;
  46 int hammer_debug_inode;
  47 int hammer_debug_locks;
  48 int hammer_debug_btree;
  49 int hammer_debug_tid;
  50 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  51 int hammer_debug_critical;              /* non-zero enter debugger on error */
  52 int hammer_cluster_enable = 2;          /* ena cluster_read, scale x 2 */
  53 int hammer_tdmux_ticks;
  54 int hammer_count_fsyncs;
  55 int hammer_count_inodes;
  56 int hammer_count_iqueued;
  57 int hammer_count_reclaims;
  58 int hammer_count_records;
  59 int hammer_count_record_datas;
  60 int hammer_count_volumes;
  61 int hammer_count_buffers;
  62 int hammer_count_nodes;
  63 int64_t hammer_stats_btree_lookups;
  64 int64_t hammer_stats_btree_searches;
  65 int64_t hammer_stats_btree_inserts;
  66 int64_t hammer_stats_btree_deletes;
  67 int64_t hammer_stats_btree_elements;
  68 int64_t hammer_stats_btree_splits;
  69 int64_t hammer_stats_btree_iterations;
  70 int64_t hammer_stats_btree_root_iterations;
  71 int64_t hammer_stats_record_iterations;
  72
  73 int64_t hammer_stats_file_read;
  74 int64_t hammer_stats_file_write;
  75 int64_t hammer_stats_disk_read;
  76 int64_t hammer_stats_disk_write;
  77 int64_t hammer_stats_inode_flushes;
  78 int64_t hammer_stats_commits;
  79 int64_t hammer_stats_undo;
  80 int64_t hammer_stats_redo;
  81
  82 long hammer_count_dirtybufspace;        /* global */
  83 int hammer_count_refedbufs;             /* global */
  84 int hammer_count_reservations;
  85 long hammer_count_io_running_read;
  86 long hammer_count_io_running_write;
  87 int hammer_count_io_locked;
  88 long hammer_limit_dirtybufspace;        /* per-mount */
  89 int hammer_limit_recs;                  /* as a whole XXX */
  90 int hammer_limit_inode_recs = 2048;     /* per inode */
  91 int hammer_limit_reclaims;
  92 int hammer_live_dedup_cache_size = 4096;
  93 int hammer_limit_redo = 4096 * 1024;    /* per inode */
  94 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
  95 int hammer_verify_zone;
  96 int hammer_verify_data = 1;
  97 int hammer_double_buffer;
  98 int hammer_btree_full_undo = 1;
  99 int hammer_yield_check = 16;
 100 int hammer_fsync_mode = 3;
 101 int64_t hammer_contention_count;
 102
 103 int hammer_noatime = 1;
 104 TUNABLE_INT("vfs.hammer.noatime", &hammer_noatime);
 105
 106 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 107 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 108            &hammer_supported_version, 0, "");
 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 110            &hammer_debug_general, 0, "");
 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 112            &hammer_debug_io, 0, "");
 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 114            &hammer_debug_inode, 0, "");
 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 116            &hammer_debug_locks, 0, "");
 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 118            &hammer_debug_btree, 0, "");
 119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 120            &hammer_debug_tid, 0, "");
 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 122            &hammer_debug_recover, 0, "");
 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 124            &hammer_debug_critical, 0, "");
 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 126            &hammer_cluster_enable, 0, "");
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 128            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 129
 130 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 131            &hammer_limit_dirtybufspace, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 133            &hammer_limit_recs, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 135            &hammer_limit_inode_recs, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 137            &hammer_limit_reclaims, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 139            &hammer_live_dedup_cache_size, 0,
 140            "Number of cache entries");
 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 142            &hammer_limit_redo, 0, "");
 143
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 145            &hammer_count_fsyncs, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 147            &hammer_count_inodes, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 149            &hammer_count_iqueued, 0, "");
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 151            &hammer_count_reclaims, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 153            &hammer_count_records, 0, "");
 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 155            &hammer_count_record_datas, 0, "");
 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 157            &hammer_count_volumes, 0, "");
 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 159            &hammer_count_buffers, 0, "");
 160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 161            &hammer_count_nodes, 0, "");
 162
 163 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 164            &hammer_stats_btree_searches, 0, "");
 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 166            &hammer_stats_btree_lookups, 0, "");
 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 168            &hammer_stats_btree_inserts, 0, "");
 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 170            &hammer_stats_btree_deletes, 0, "");
 171 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 172            &hammer_stats_btree_elements, 0, "");
 173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 174            &hammer_stats_btree_splits, 0, "");
 175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 176            &hammer_stats_btree_iterations, 0, "");
 177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 178            &hammer_stats_btree_root_iterations, 0, "");
 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 180            &hammer_stats_record_iterations, 0, "");
 181
 182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 183            &hammer_stats_file_read, 0, "");
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 185            &hammer_stats_file_write, 0, "");
 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 187            &hammer_stats_disk_read, 0, "");
 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 189            &hammer_stats_disk_write, 0, "");
 190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 191            &hammer_stats_inode_flushes, 0, "");
 192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 193            &hammer_stats_commits, 0, "");
 194 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 195            &hammer_stats_undo, 0, "");
 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 197            &hammer_stats_redo, 0, "");
 198
 199 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 200            &hammer_count_dirtybufspace, 0, "");
 201 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 202            &hammer_count_refedbufs, 0, "");
 203 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 204            &hammer_count_reservations, 0, "");
 205 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 206            &hammer_count_io_running_read, 0, "");
 207 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 208            &hammer_count_io_locked, 0, "");
 209 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 210            &hammer_count_io_running_write, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 212            &hammer_contention_count, 0, "");
 213 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 214            &hammer_autoflush, 0, "");
 215 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 216            &hammer_verify_zone, 0, "");
 217 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 218            &hammer_verify_data, 0, "");
 219 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 220            &hammer_double_buffer, 0, "");
 221 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
 222            &hammer_btree_full_undo, 0, "");
 223 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 224            &hammer_yield_check, 0, "");
 225 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 226            &hammer_fsync_mode, 0, "");
 227
 228 /* KTR_INFO_MASTER(hammer); */
 229
 230 /*
 231  * VFS ABI
 232  */
 233 static void     hammer_free_hmp(struct mount *mp);
 234
 235 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 236                                 struct ucred *cred);
 237 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 238 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 239 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 240                                 struct ucred *cred);
 241 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 242                                 struct ucred *cred);
 243 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 244 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 245                                 ino_t ino, struct vnode **vpp);
 246 static int      hammer_vfs_init(struct vfsconf *conf);
 247 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 248                                 struct fid *fhp, struct vnode **vpp);
 249 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 250 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 251                                 int *exflagsp, struct ucred **credanonp);
 252
 253
 254 static struct vfsops hammer_vfsops = {
 255         .vfs_mount      = hammer_vfs_mount,
 256         .vfs_unmount    = hammer_vfs_unmount,
 257         .vfs_root       = hammer_vfs_root,
 258         .vfs_statfs     = hammer_vfs_statfs,
 259         .vfs_statvfs    = hammer_vfs_statvfs,
 260         .vfs_sync       = hammer_vfs_sync,
 261         .vfs_vget       = hammer_vfs_vget,
 262         .vfs_init       = hammer_vfs_init,
 263         .vfs_vptofh     = hammer_vfs_vptofh,
 264         .vfs_fhtovp     = hammer_vfs_fhtovp,
 265         .vfs_checkexp   = hammer_vfs_checkexp
 266 };
 267
 268 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 269
 270 VFS_SET(hammer_vfsops, hammer, VFCF_MPSAFE);
 271 MODULE_VERSION(hammer, 1);
 272
 273 static int
 274 hammer_vfs_init(struct vfsconf *conf)
 275 {
 276         long n;
 277
 278         /*
 279          * Wait up to this long for an exclusive deadlock to clear
 280          * before acquiring a new shared lock on the ip.  The deadlock
 281          * may have occured on a b-tree node related to the ip.
 282          */
 283         if (hammer_tdmux_ticks == 0)
 284                 hammer_tdmux_ticks = hz / 5;
 285
 286         /*
 287          * Autosize, but be careful because a hammer filesystem's
 288          * reserve is partially calculated based on dirtybufspace,
 289          * so we simply cannot allow it to get too large.
 290          */
 291         if (hammer_limit_recs == 0) {
 292                 n = nbuf * 25;
 293                 if (n > kmalloc_limit(M_HAMMER) / 512)
 294                         n = kmalloc_limit(M_HAMMER) / 512;
 295                 if (n > 2 * 1024 * 1024)
 296                         n = 2 * 1024 * 1024;
 297                 hammer_limit_recs = (int)n;
 298         }
 299         if (hammer_limit_dirtybufspace == 0) {
 300                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 301                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
 302                         hammer_limit_dirtybufspace = 1024L * 1024;
 303                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
 304                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
 305         }
 306
 307         /*
 308          * The hammer_inode structure detaches from the vnode on reclaim.
 309          * This limits the number of inodes in this state to prevent a
 310          * memory pool blowout.
 311          */
 312         if (hammer_limit_reclaims == 0) {
 313                 hammer_limit_reclaims = maxvnodes / 10;
 314                 if (hammer_limit_reclaims > HAMMER_LIMIT_RECLAIMS)
 315                         hammer_limit_reclaims = HAMMER_LIMIT_RECLAIMS;
 316         }
 317
 318         return(0);
 319 }
 320
 321 static int
 322 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 323                  struct ucred *cred)
 324 {
 325         struct hammer_mount_info info;
 326         hammer_mount_t hmp;
 327         hammer_volume_t rootvol;
 328         struct vnode *rootvp;
 329         struct vnode *devvp = NULL;
 330         const char *upath;      /* volume name in userspace */
 331         char *path;             /* volume name in system space */
 332         int error;
 333         int i;
 334         int master_id;
 335         int nvolumes;
 336         char *next_volume_ptr = NULL;
 337
 338         if (hammer_noatime) {
 339                 /* Force noatime */
 340                 mp->mnt_flag |= MNT_NOATIME;
 341         }
 342
 343         /*
 344          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 345          */
 346         if (mntpt == NULL) {
 347                 bzero(&info, sizeof(info));
 348                 info.asof = 0;
 349                 info.hflags = 0;
 350                 info.nvolumes = 1;
 351
 352                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 353
 354                 /* Count number of volumes separated by ':' */
 355                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 356                         if (*p == ':') {
 357                                 ++info.nvolumes;
 358                         }
 359                 }
 360
 361                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 362         } else {
 363                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 364                         return (error);
 365         }
 366
 367         /*
 368          * updating or new mount
 369          */
 370         if (mp->mnt_flag & MNT_UPDATE) {
 371                 hmp = (void *)mp->mnt_data;
 372                 KKASSERT(hmp != NULL);
 373         } else {
 374                 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
 375                         return (EINVAL);
 376                 hmp = NULL;
 377         }
 378
 379         /*
 380          * master-id validation.  The master id may not be changed by a
 381          * mount update.
 382          */
 383         if (info.hflags & HMNT_MASTERID || info.hflags & HMNT_NOMIRROR) {
 384                 if (hmp && hmp->master_id != info.master_id) {
 385                         hkprintf("cannot change master id with mount update\n");
 386                         return(EINVAL);
 387                 }
 388                 master_id = info.master_id;
 389                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 390                         return (EINVAL);
 391         } else {
 392                 if (hmp)
 393                         master_id = hmp->master_id;
 394                 else
 395                         master_id = 0;
 396         }
 397
 398         /*
 399          * Internal mount data structure
 400          */
 401         if (hmp == NULL) {
 402                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 403                 mp->mnt_data = (qaddr_t)hmp;
 404                 hmp->mp = mp;
 405
 406                 /*
 407                  * Make sure kmalloc type limits are set appropriately.
 408                  *
 409                  * Our inode kmalloc group is sized based on maxvnodes
 410                  * (controlled by the system, not us).
 411                  */
 412                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 413                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 414
 415                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 416
 417                 hmp->root_btree_beg.localization =
 418                         HAMMER_MIN_ONDISK_LOCALIZATION;
 419                 hmp->root_btree_beg.obj_id = HAMMER_MIN_OBJID;
 420                 hmp->root_btree_beg.key = HAMMER_MIN_KEY;
 421                 hmp->root_btree_beg.create_tid = 1;
 422                 hmp->root_btree_beg.delete_tid = 1;
 423                 hmp->root_btree_beg.rec_type = HAMMER_MIN_RECTYPE;
 424                 hmp->root_btree_beg.obj_type = 0;
 425                 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
 426
 427                 hmp->root_btree_end.localization =
 428                         HAMMER_MAX_ONDISK_LOCALIZATION;
 429                 hmp->root_btree_end.obj_id = HAMMER_MAX_OBJID;
 430                 hmp->root_btree_end.key = HAMMER_MAX_KEY;
 431                 hmp->root_btree_end.create_tid = HAMMER_MAX_TID;
 432                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 433                 hmp->root_btree_end.rec_type = HAMMER_MAX_RECTYPE;
 434                 hmp->root_btree_end.obj_type = 0;
 435                 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
 436
 437                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 438                 hmp->krate.count = -16; /* initial burst */
 439                 hmp->kdiag.freq = 1;    /* maximum reporting rate (hz) */
 440                 hmp->kdiag.count = -16; /* initial burst */
 441
 442                 hmp->sync_lock.refs = 1;
 443                 hmp->undo_lock.refs = 1;
 444                 hmp->blkmap_lock.refs = 1;
 445                 hmp->snapshot_lock.refs = 1;
 446                 hmp->volume_lock.refs = 1;
 447
 448                 TAILQ_INIT(&hmp->delay_list);
 449                 TAILQ_INIT(&hmp->flush_group_list);
 450                 TAILQ_INIT(&hmp->objid_cache_list);
 451                 TAILQ_INIT(&hmp->undo_lru_list);
 452                 TAILQ_INIT(&hmp->reclaim_list);
 453         }
 454         hmp->hflags &= ~HMNT_USERFLAGS;
 455         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 456
 457         hmp->master_id = master_id;
 458
 459         if (info.asof) {
 460                 mp->mnt_flag |= MNT_RDONLY;
 461                 hmp->asof = info.asof;
 462         } else {
 463                 hmp->asof = HAMMER_MAX_TID;
 464         }
 465
 466         hmp->volume_to_remove = -1;
 467
 468         /*
 469          * Re-open read-write if originally read-only, or vise-versa.
 470          *
 471          * When going from read-only to read-write execute the stage2
 472          * recovery if it has not already been run.
 473          */
 474         if (mp->mnt_flag & MNT_UPDATE) {
 475                 lwkt_gettoken(&hmp->fs_token);
 476                 error = 0;
 477                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 478                         hkprintf("read-only -> read-write\n");
 479                         hmp->ronly = 0;
 480                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 481                                 hammer_adjust_volume_mode, NULL);
 482                         rootvol = hammer_get_root_volume(hmp, &error);
 483                         if (rootvol) {
 484                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 485                                 error = hammer_recover_stage2(hmp, rootvol);
 486                                 bcopy(rootvol->ondisk->vol0_blockmap,
 487                                       hmp->blockmap,
 488                                       sizeof(hmp->blockmap));
 489                                 hammer_rel_volume(rootvol, 0);
 490                         }
 491                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 492                                 hammer_reload_inode, NULL);
 493                         /* kernel clears MNT_RDONLY */
 494                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 495                         hkprintf("read-write -> read-only\n");
 496                         hmp->ronly = 1; /* messy */
 497                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 498                                 hammer_reload_inode, NULL);
 499                         hmp->ronly = 0;
 500                         hammer_flusher_sync(hmp);
 501                         hammer_flusher_sync(hmp);
 502                         hammer_flusher_sync(hmp);
 503                         hmp->ronly = 1;
 504                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 505                                 hammer_adjust_volume_mode, NULL);
 506                 }
 507                 lwkt_reltoken(&hmp->fs_token);
 508                 return(error);
 509         }
 510
 511         RB_INIT(&hmp->rb_vols_root);
 512         RB_INIT(&hmp->rb_inos_root);
 513         RB_INIT(&hmp->rb_redo_root);
 514         RB_INIT(&hmp->rb_nods_root);
 515         RB_INIT(&hmp->rb_undo_root);
 516         RB_INIT(&hmp->rb_resv_root);
 517         RB_INIT(&hmp->rb_bufs_root);
 518         RB_INIT(&hmp->rb_pfsm_root);
 519
 520         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 521
 522         RB_INIT(&hmp->volu_root);
 523         RB_INIT(&hmp->undo_root);
 524         RB_INIT(&hmp->data_root);
 525         RB_INIT(&hmp->meta_root);
 526         RB_INIT(&hmp->lose_root);
 527         TAILQ_INIT(&hmp->iorun_list);
 528
 529         lwkt_token_init(&hmp->fs_token, "hammerfs");
 530         lwkt_token_init(&hmp->io_token, "hammerio");
 531
 532         lwkt_gettoken(&hmp->fs_token);
 533
 534         /*
 535          * Load volumes
 536          */
 537         path = objcache_get(namei_oc, M_WAITOK);
 538         hmp->nvolumes = -1;
 539         for (i = 0; i < info.nvolumes; ++i) {
 540                 if (mntpt == NULL) {
 541                         /*
 542                          * Root mount.
 543                          */
 544                         KKASSERT(next_volume_ptr != NULL);
 545                         strcpy(path, "");
 546                         if (*next_volume_ptr != '/') {
 547                                 /* relative path */
 548                                 strcpy(path, "/dev/");
 549                         }
 550                         int k;
 551                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 552                                 if (*next_volume_ptr == '\0') {
 553                                         break;
 554                                 } else if (*next_volume_ptr == ':') {
 555                                         ++next_volume_ptr;
 556                                         break;
 557                                 } else {
 558                                         path[k] = *next_volume_ptr;
 559                                         ++next_volume_ptr;
 560                                 }
 561                         }
 562                         path[k] = '\0';
 563
 564                         error = 0;
 565                         cdev_t dev = kgetdiskbyname(path);
 566                         error = bdevvp(dev, &devvp);
 567                         if (error) {
 568                                 hdkprintf("can't find devvp\n");
 569                         }
 570                 } else {
 571                         error = copyin(&info.volumes[i], &upath,
 572                                        sizeof(char *));
 573                         if (error == 0)
 574                                 error = copyinstr(upath, path,
 575                                                   MAXPATHLEN, NULL);
 576                 }
 577                 if (error == 0)
 578                         error = hammer_install_volume(hmp, path, devvp, NULL);
 579                 if (error)
 580                         break;
 581         }
 582         objcache_put(namei_oc, path);
 583
 584         /*
 585          * Make sure we found a root volume
 586          */
 587         if (hmp->rootvol == NULL) {
 588                 if (error == EBUSY) {
 589                         hdkprintf("The volumes are probably mounted\n");
 590                 } else {
 591                         hdkprintf("No root volume found!\n");
 592                         error = EINVAL;
 593                 }
 594                 goto failed;
 595         }
 596
 597         /*
 598          * Check that all required volumes are available
 599          */
 600         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 601                 hdkprintf("Missing volumes, cannot mount!\n");
 602                 error = EINVAL;
 603                 goto failed;
 604         }
 605
 606         /*
 607          * Other errors
 608          */
 609         if (error) {
 610                 hdkprintf("Failed to load volumes!\n");
 611                 goto failed;
 612         }
 613
 614         nvolumes = hammer_get_installed_volumes(hmp);
 615         if (hmp->nvolumes != nvolumes) {
 616                 hdkprintf("volume header says %d volumes, but %d installed\n",
 617                         hmp->nvolumes, nvolumes);
 618                 error = EINVAL;
 619                 goto failed;
 620         }
 621
 622         /*
 623          * No errors, setup enough of the mount point so we can lookup the
 624          * root vnode.
 625          */
 626         mp->mnt_iosize_max = MAXPHYS;
 627         mp->mnt_kern_flag |= MNTK_FSMID;
 628         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 629
 630         /*
 631          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 632          * will acquire a per-mount token prior to entry and release it
 633          * on return.
 634          */
 635         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 636
 637         /*
 638          * note: f_iosize is used by vnode_pager_haspage() when constructing
 639          * its VOP_BMAP call.
 640          */
 641         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 642         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 643
 644         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 645         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 646
 647         mp->mnt_maxsymlinklen = 255;
 648         mp->mnt_flag |= MNT_LOCAL;
 649
 650         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 651         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 652         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 653
 654         /*
 655          * The root volume's ondisk pointer is only valid if we hold a
 656          * reference to it.
 657          */
 658         rootvol = hammer_get_root_volume(hmp, &error);
 659         if (error)
 660                 goto failed;
 661
 662         /*
 663          * Perform any necessary UNDO operations.  The recovery code does
 664          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 665          * and then re-copy it again after recovery is complete.
 666          *
 667          * If this is a read-only mount the UNDO information is retained
 668          * in memory in the form of dirty buffer cache buffers, and not
 669          * written back to the media.
 670          */
 671         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 672               sizeof(hmp->blockmap));
 673
 674         /*
 675          * Check filesystem version
 676          */
 677         hmp->version = rootvol->ondisk->vol_version;
 678         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 679             hmp->version > HAMMER_VOL_VERSION_MAX) {
 680                 hkprintf("mount unsupported fs version %d\n", hmp->version);
 681                 error = ERANGE;
 682                 goto done;
 683         }
 684
 685         /*
 686          * The undo_rec_limit limits the size of flush groups to avoid
 687          * blowing out the UNDO FIFO.  This calculation is typically in
 688          * the tens of thousands and is designed primarily when small
 689          * HAMMER filesystems are created.
 690          */
 691         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 692         if (hammer_debug_general & 0x0001)
 693                 hkprintf("undo_rec_limit %d\n", hmp->undo_rec_limit);
 694
 695         /*
 696          * NOTE: Recover stage1 not only handles meta-data recovery, it
 697          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 698          */
 699         error = hammer_recover_stage1(hmp, rootvol);
 700         if (error) {
 701                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 702                 goto done;
 703         }
 704
 705         /*
 706          * Finish setup now that we have a good root volume.
 707          */
 708         ksnprintf(mp->mnt_stat.f_mntfromname,
 709                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 710                   rootvol->ondisk->vol_label);
 711         mp->mnt_stat.f_fsid.val[0] =
 712                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 713         mp->mnt_stat.f_fsid.val[1] =
 714                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 715         mp->mnt_stat.f_fsid.val[1] &= HAMMER_LOCALIZE_MASK;
 716
 717         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 718         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 719                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 720
 721         /*
 722          * Certain often-modified fields in the root volume are cached in
 723          * the hammer_mount structure so we do not have to generate lots
 724          * of little UNDO structures for them.
 725          *
 726          * Recopy after recovery.  This also has the side effect of
 727          * setting our cached undo FIFO's first_offset, which serves to
 728          * placemark the FIFO start for the NEXT flush cycle while the
 729          * on-disk first_offset represents the LAST flush cycle.
 730          */
 731         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 732         hmp->flush_tid1 = hmp->next_tid;
 733         hmp->flush_tid2 = hmp->next_tid;
 734         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 735               sizeof(hmp->blockmap));
 736         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 737
 738         hammer_flusher_create(hmp);
 739
 740         /*
 741          * Locate the root directory with an obj_id of 1.
 742          */
 743         error = hammer_vfs_root(mp, &rootvp);
 744         if (error)
 745                 goto done;
 746         vput(rootvp);
 747         if (hmp->ronly == 0)
 748                 error = hammer_recover_stage2(hmp, rootvol);
 749
 750         /*
 751          * If the stage2 recovery fails be sure to clean out all cached
 752          * vnodes before throwing away the mount structure or bad things
 753          * will happen.
 754          */
 755         if (error)
 756                 vflush(mp, 0, 0);
 757
 758 done:
 759         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 760                 /* New mount */
 761
 762                 /* Populate info for mount point (NULL pad)*/
 763                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
 764                 size_t size;
 765                 if (mntpt) {
 766                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
 767                                                         MNAMELEN -1, &size);
 768                 } else { /* Root mount */
 769                         mp->mnt_stat.f_mntonname[0] = '/';
 770                 }
 771         }
 772         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
 773         hammer_rel_volume(rootvol, 0);
 774 failed:
 775         /*
 776          * Cleanup and return.
 777          */
 778         if (error) {
 779                 /* called with fs_token held */
 780                 hammer_free_hmp(mp);
 781         } else {
 782                 lwkt_reltoken(&hmp->fs_token);
 783         }
 784         return (error);
 785 }
 786
 787 static int
 788 hammer_vfs_unmount(struct mount *mp, int mntflags)
 789 {
 790         hammer_mount_t hmp = (void *)mp->mnt_data;
 791         int flags;
 792         int error;
 793
 794         /*
 795          * Clean out the vnodes
 796          */
 797         lwkt_gettoken(&hmp->fs_token);
 798         flags = 0;
 799         if (mntflags & MNT_FORCE)
 800                 flags |= FORCECLOSE;
 801         error = vflush(mp, 0, flags);
 802
 803         /*
 804          * Clean up the internal mount structure and related entities.  This
 805          * may issue I/O.
 806          */
 807         if (error == 0) {
 808                 /* called with fs_token held */
 809                 hammer_free_hmp(mp);
 810         } else {
 811                 lwkt_reltoken(&hmp->fs_token);
 812         }
 813         return(error);
 814 }
 815
 816 /*
 817  * Clean up the internal mount structure and disassociate it from the mount.
 818  * This may issue I/O.
 819  *
 820  * Called with fs_token held.
 821  */
 822 static void
 823 hammer_free_hmp(struct mount *mp)
 824 {
 825         hammer_mount_t hmp = (void *)mp->mnt_data;
 826         hammer_flush_group_t flg;
 827
 828         /*
 829          * Flush anything dirty.  This won't even run if the
 830          * filesystem errored-out.
 831          */
 832         hammer_flush_dirty(hmp, 30);
 833
 834         /*
 835          * If the mount had a critical error we have to destroy any
 836          * remaining inodes before we can finish cleaning up the flusher.
 837          */
 838         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 839                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 840                         hammer_destroy_inode_callback, NULL);
 841         }
 842
 843         /*
 844          * There shouldn't be any inodes left now and any left over
 845          * flush groups should now be empty.
 846          */
 847         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 848         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 849                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 850                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 851                 if (flg->refs) {
 852                         hkprintf("Warning, flush_group %p was "
 853                                 "not empty on umount!\n", flg);
 854                 }
 855                 kfree(flg, hmp->m_misc);
 856         }
 857
 858         /*
 859          * We can finally destroy the flusher
 860          */
 861         hammer_flusher_destroy(hmp);
 862
 863         /*
 864          * We may have held recovered buffers due to a read-only mount.
 865          * These must be discarded.
 866          */
 867         if (hmp->ronly)
 868                 hammer_recover_flush_buffers(hmp, NULL, -1);
 869
 870         /*
 871          * Unload buffers and then volumes
 872          */
 873         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 874                 hammer_unload_buffer, NULL);
 875         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 876                 hammer_unload_volume, NULL);
 877
 878         mp->mnt_data = NULL;
 879         mp->mnt_flag &= ~MNT_LOCAL;
 880         hmp->mp = NULL;
 881         hammer_destroy_objid_cache(hmp);
 882         kmalloc_destroy(&hmp->m_misc);
 883         kmalloc_destroy(&hmp->m_inodes);
 884         lwkt_reltoken(&hmp->fs_token);
 885         kfree(hmp, M_HAMMER);
 886 }
 887
 888 /*
 889  * Report critical errors.  ip may be NULL.
 890  */
 891 void
 892 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 893                       int error, const char *msg)
 894 {
 895         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 896
 897         hmkrateprintf(&hmp->krate, hmp,
 898                     "Critical error inode=%jd error=%d %s\n",
 899                     (intmax_t)(ip ? ip->obj_id : -1),
 900                     error, msg);
 901
 902         if (hmp->ronly == 0) {
 903                 hmp->ronly = 2;         /* special errored read-only mode */
 904                 hmp->mp->mnt_flag |= MNT_RDONLY;
 905                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 906                         hammer_adjust_volume_mode, NULL);
 907                 hmkprintf(hmp, "Forcing read-only mode\n");
 908         }
 909         hmp->error = error;
 910         if (hammer_debug_critical)
 911                 Debugger("Entering debugger");
 912 }
 913
 914
 915 /*
 916  * Obtain a vnode for the specified inode number.  An exclusively locked
 917  * vnode is returned.
 918  */
 919 int
 920 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 921                 ino_t ino, struct vnode **vpp)
 922 {
 923         struct hammer_transaction trans;
 924         hammer_mount_t hmp = (void *)mp->mnt_data;
 925         hammer_inode_t ip;
 926         int error;
 927         uint32_t localization;
 928
 929         lwkt_gettoken(&hmp->fs_token);
 930         hammer_simple_transaction(&trans, hmp);
 931
 932         /*
 933          * If a directory vnode is supplied (mainly NFS) then we can acquire
 934          * the PFS domain from it.  Otherwise we would only be able to vget
 935          * inodes in the root PFS.
 936          */
 937         if (dvp) {
 938                 localization = HAMMER_DEF_LOCALIZATION |
 939                                 VTOI(dvp)->obj_localization;
 940         } else {
 941                 localization = HAMMER_DEF_LOCALIZATION;
 942         }
 943
 944         /*
 945          * Lookup the requested HAMMER inode.  The structure must be
 946          * left unlocked while we manipulate the related vnode to avoid
 947          * a deadlock.
 948          */
 949         ip = hammer_get_inode(&trans, NULL, ino,
 950                               hmp->asof, localization,
 951                               0, &error);
 952         if (ip == NULL) {
 953                 *vpp = NULL;
 954         } else {
 955                 error = hammer_get_vnode(ip, vpp);
 956                 hammer_rel_inode(ip, 0);
 957         }
 958         hammer_done_transaction(&trans);
 959         lwkt_reltoken(&hmp->fs_token);
 960         return (error);
 961 }
 962
 963 /*
 964  * Return the root vnode for the filesystem.
 965  *
 966  * HAMMER stores the root vnode in the hammer_mount structure so
 967  * getting it is easy.
 968  */
 969 static int
 970 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 971 {
 972         int error;
 973
 974         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp);
 975         return (error);
 976 }
 977
 978 static int
 979 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 980 {
 981         hammer_mount_t hmp = (void *)mp->mnt_data;
 982         hammer_volume_t volume;
 983         hammer_volume_ondisk_t ondisk;
 984         int error;
 985         int64_t bfree;
 986         int64_t breserved;
 987
 988         lwkt_gettoken(&hmp->fs_token);
 989         volume = hammer_get_root_volume(hmp, &error);
 990         if (error) {
 991                 lwkt_reltoken(&hmp->fs_token);
 992                 return(error);
 993         }
 994         ondisk = volume->ondisk;
 995
 996         /*
 997          * Basic stats
 998          */
 999         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1000         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1001         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1002         hammer_rel_volume(volume, 0);
1003
1004         if (breserved > bfree)
1005                 breserved = bfree;
1006         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1007         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1008         if (mp->mnt_stat.f_files < 0)
1009                 mp->mnt_stat.f_files = 0;
1010
1011         *sbp = mp->mnt_stat;
1012         lwkt_reltoken(&hmp->fs_token);
1013         return(0);
1014 }
1015
1016 static int
1017 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1018 {
1019         hammer_mount_t hmp = (void *)mp->mnt_data;
1020         hammer_volume_t volume;
1021         hammer_volume_ondisk_t ondisk;
1022         int error;
1023         int64_t bfree;
1024         int64_t breserved;
1025
1026         lwkt_gettoken(&hmp->fs_token);
1027         volume = hammer_get_root_volume(hmp, &error);
1028         if (error) {
1029                 lwkt_reltoken(&hmp->fs_token);
1030                 return(error);
1031         }
1032         ondisk = volume->ondisk;
1033
1034         /*
1035          * Basic stats
1036          */
1037         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1038         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1039         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1040         hammer_rel_volume(volume, 0);
1041
1042         if (breserved > bfree)
1043                 breserved = bfree;
1044         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1045         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1046         if (mp->mnt_vstat.f_files < 0)
1047                 mp->mnt_vstat.f_files = 0;
1048         *sbp = mp->mnt_vstat;
1049         lwkt_reltoken(&hmp->fs_token);
1050         return(0);
1051 }
1052
1053 /*
1054  * Sync the filesystem.  Currently we have to run it twice, the second
1055  * one will advance the undo start index to the end index, so if a crash
1056  * occurs no undos will be run on mount.
1057  *
1058  * We do not sync the filesystem if we are called from a panic.  If we did
1059  * we might end up blowing up a sync that was already in progress.
1060  */
1061 static int
1062 hammer_vfs_sync(struct mount *mp, int waitfor)
1063 {
1064         hammer_mount_t hmp = (void *)mp->mnt_data;
1065         int error;
1066
1067         lwkt_gettoken(&hmp->fs_token);
1068         if (panicstr == NULL) {
1069                 error = hammer_sync_hmp(hmp, waitfor);
1070         } else {
1071                 error = EIO;
1072         }
1073         lwkt_reltoken(&hmp->fs_token);
1074         return (error);
1075 }
1076
1077 /*
1078  * Convert a vnode to a file handle.
1079  *
1080  * Accesses read-only fields on already-referenced structures so
1081  * no token is needed.
1082  */
1083 static int
1084 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1085 {
1086         hammer_inode_t ip;
1087
1088         KKASSERT(MAXFIDSZ >= 16);
1089         ip = VTOI(vp);
1090         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1091         fhp->fid_ext = lo_to_pfs(ip->obj_localization);
1092         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1093         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1094         return(0);
1095 }
1096
1097
1098 /*
1099  * Convert a file handle back to a vnode.
1100  *
1101  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1102  * null mount.
1103  */
1104 static int
1105 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1106                   struct fid *fhp, struct vnode **vpp)
1107 {
1108         hammer_mount_t hmp = (void *)mp->mnt_data;
1109         struct hammer_transaction trans;
1110         hammer_inode_t ip;
1111         struct hammer_inode_info info;
1112         int error;
1113         uint32_t localization;
1114
1115         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1116         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1117         if (rootvp)
1118                 localization = VTOI(rootvp)->obj_localization;
1119         else
1120                 localization = pfs_to_lo(fhp->fid_ext);
1121
1122         lwkt_gettoken(&hmp->fs_token);
1123         hammer_simple_transaction(&trans, hmp);
1124
1125         /*
1126          * Get/allocate the hammer_inode structure.  The structure must be
1127          * unlocked while we manipulate the related vnode to avoid a
1128          * deadlock.
1129          */
1130         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1131                               info.obj_asof, localization, 0, &error);
1132         if (ip) {
1133                 error = hammer_get_vnode(ip, vpp);
1134                 hammer_rel_inode(ip, 0);
1135         } else {
1136                 *vpp = NULL;
1137         }
1138         hammer_done_transaction(&trans);
1139         lwkt_reltoken(&hmp->fs_token);
1140         return (error);
1141 }
1142
1143 static int
1144 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1145                     int *exflagsp, struct ucred **credanonp)
1146 {
1147         hammer_mount_t hmp = (void *)mp->mnt_data;
1148         struct netcred *np;
1149         int error;
1150
1151         lwkt_gettoken(&hmp->fs_token);
1152         np = vfs_export_lookup(mp, &hmp->export, nam);
1153         if (np) {
1154                 *exflagsp = np->netc_exflags;
1155                 *credanonp = &np->netc_anon;
1156                 error = 0;
1157         } else {
1158                 error = EACCES;
1159         }
1160         lwkt_reltoken(&hmp->fs_token);
1161         return (error);
1162
1163 }
1164
1165 int
1166 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1167 {
1168         hammer_mount_t hmp = (void *)mp->mnt_data;
1169         int error;
1170
1171         lwkt_gettoken(&hmp->fs_token);
1172
1173         switch(op) {
1174         case MOUNTCTL_SET_EXPORT:
1175                 error = vfs_export(mp, &hmp->export, export);
1176                 break;
1177         default:
1178                 error = EOPNOTSUPP;
1179                 break;
1180         }
1181         lwkt_reltoken(&hmp->fs_token);
1182
1183         return(error);
1184 }
1185