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_count_fsyncs;
  67 int hammer_count_inodes;
  68 int hammer_count_iqueued;
  69 int hammer_count_reclaiming;
  70 int hammer_count_records;
  71 int hammer_count_record_datas;
  72 int hammer_count_volumes;
  73 int hammer_count_buffers;
  74 int hammer_count_nodes;
  75 int64_t hammer_count_extra_space_used;
  76 int64_t hammer_stats_btree_lookups;
  77 int64_t hammer_stats_btree_searches;
  78 int64_t hammer_stats_btree_inserts;
  79 int64_t hammer_stats_btree_deletes;
  80 int64_t hammer_stats_btree_elements;
  81 int64_t hammer_stats_btree_splits;
  82 int64_t hammer_stats_btree_iterations;
  83 int64_t hammer_stats_btree_root_iterations;
  84 int64_t hammer_stats_record_iterations;
  85
  86 int64_t hammer_stats_file_read;
  87 int64_t hammer_stats_file_write;
  88 int64_t hammer_stats_file_iopsr;
  89 int64_t hammer_stats_file_iopsw;
  90 int64_t hammer_stats_disk_read;
  91 int64_t hammer_stats_disk_write;
  92 int64_t hammer_stats_inode_flushes;
  93 int64_t hammer_stats_commits;
  94 int64_t hammer_stats_undo;
  95 int64_t hammer_stats_redo;
  96
  97 int hammer_count_dirtybufspace;         /* global */
  98 int hammer_count_refedbufs;             /* global */
  99 int hammer_count_reservations;
 100 int hammer_count_io_running_read;
 101 int hammer_count_io_running_write;
 102 int hammer_count_io_locked;
 103 int hammer_limit_dirtybufspace;         /* per-mount */
 104 int hammer_limit_running_io;            /* per-mount */
 105 int hammer_limit_recs;                  /* as a whole XXX */
 106 int hammer_limit_inode_recs = 1024;     /* per inode */
 107 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
 108 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 109 int hammer_autoflush = 2000;            /* auto flush */
 110 int hammer_bio_count;
 111 int hammer_verify_zone;
 112 int hammer_verify_data = 1;
 113 int hammer_write_mode;
 114 int hammer_yield_check = 16;
 115 int hammer_fsync_mode = 3;
 116 int64_t hammer_contention_count;
 117 int64_t hammer_zone_limit;
 118
 119 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 121            &hammer_supported_version, 0, "");
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 123            &hammer_debug_general, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 125            &hammer_debug_io, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 127            &hammer_debug_debug, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 129            &hammer_debug_inode, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 131            &hammer_debug_locks, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 133            &hammer_debug_btree, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 135            &hammer_debug_tid, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 137            &hammer_debug_recover, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 139            &hammer_debug_recover_faults, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 141            &hammer_debug_critical, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 143            &hammer_cluster_enable, 0, "");
 144
 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 146            &hammer_limit_dirtybufspace, 0, "");
 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
 148            &hammer_limit_running_io, 0, "");
 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 150            &hammer_limit_recs, 0, "");
 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 152            &hammer_limit_inode_recs, 0, "");
 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
 154            &hammer_limit_reclaim, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 156            &hammer_limit_redo, 0, "");
 157
 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 159            &hammer_count_fsyncs, 0, "");
 160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 161            &hammer_count_inodes, 0, "");
 162 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 163            &hammer_count_iqueued, 0, "");
 164 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 165            &hammer_count_reclaiming, 0, "");
 166 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 167            &hammer_count_records, 0, "");
 168 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 169            &hammer_count_record_datas, 0, "");
 170 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 171            &hammer_count_volumes, 0, "");
 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 173            &hammer_count_buffers, 0, "");
 174 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 175            &hammer_count_nodes, 0, "");
 176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 177            &hammer_count_extra_space_used, 0, "");
 178
 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 180            &hammer_stats_btree_searches, 0, "");
 181 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 182            &hammer_stats_btree_lookups, 0, "");
 183 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 184            &hammer_stats_btree_inserts, 0, "");
 185 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 186            &hammer_stats_btree_deletes, 0, "");
 187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 188            &hammer_stats_btree_elements, 0, "");
 189 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 190            &hammer_stats_btree_splits, 0, "");
 191 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 192            &hammer_stats_btree_iterations, 0, "");
 193 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 194            &hammer_stats_btree_root_iterations, 0, "");
 195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 196            &hammer_stats_record_iterations, 0, "");
 197
 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 199            &hammer_stats_file_read, 0, "");
 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 201            &hammer_stats_file_write, 0, "");
 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 203            &hammer_stats_file_iopsr, 0, "");
 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 205            &hammer_stats_file_iopsw, 0, "");
 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 207            &hammer_stats_disk_read, 0, "");
 208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 209            &hammer_stats_disk_write, 0, "");
 210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 211            &hammer_stats_inode_flushes, 0, "");
 212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 213            &hammer_stats_commits, 0, "");
 214 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 215            &hammer_stats_undo, 0, "");
 216 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 217            &hammer_stats_redo, 0, "");
 218
 219 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 220            &hammer_count_dirtybufspace, 0, "");
 221 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 222            &hammer_count_refedbufs, 0, "");
 223 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 224            &hammer_count_reservations, 0, "");
 225 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 226            &hammer_count_io_running_read, 0, "");
 227 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 228            &hammer_count_io_locked, 0, "");
 229 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 230            &hammer_count_io_running_write, 0, "");
 231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 232            &hammer_zone_limit, 0, "");
 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 234            &hammer_contention_count, 0, "");
 235 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 236            &hammer_autoflush, 0, "");
 237 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 238            &hammer_verify_zone, 0, "");
 239 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 240            &hammer_verify_data, 0, "");
 241 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 242            &hammer_write_mode, 0, "");
 243 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 244            &hammer_yield_check, 0, "");
 245 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 246            &hammer_fsync_mode, 0, "");
 247
 248 KTR_INFO_MASTER(hammer);
 249
 250 /*
 251  * VFS ABI
 252  */
 253 static void     hammer_free_hmp(struct mount *mp);
 254
 255 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 256                                 struct ucred *cred);
 257 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 258 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 259 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 260                                 struct ucred *cred);
 261 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 262                                 struct ucred *cred);
 263 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 264 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 265                                 ino_t ino, struct vnode **vpp);
 266 static int      hammer_vfs_init(struct vfsconf *conf);
 267 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 268                                 struct fid *fhp, struct vnode **vpp);
 269 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 270 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 271                                 int *exflagsp, struct ucred **credanonp);
 272
 273
 274 static struct vfsops hammer_vfsops = {
 275         .vfs_mount      = hammer_vfs_mount,
 276         .vfs_unmount    = hammer_vfs_unmount,
 277         .vfs_root       = hammer_vfs_root,
 278         .vfs_statfs     = hammer_vfs_statfs,
 279         .vfs_statvfs    = hammer_vfs_statvfs,
 280         .vfs_sync       = hammer_vfs_sync,
 281         .vfs_vget       = hammer_vfs_vget,
 282         .vfs_init       = hammer_vfs_init,
 283         .vfs_vptofh     = hammer_vfs_vptofh,
 284         .vfs_fhtovp     = hammer_vfs_fhtovp,
 285         .vfs_checkexp   = hammer_vfs_checkexp
 286 };
 287
 288 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 289
 290 VFS_SET(hammer_vfsops, hammer, 0);
 291 MODULE_VERSION(hammer, 1);
 292
 293 static int
 294 hammer_vfs_init(struct vfsconf *conf)
 295 {
 296         int n;
 297
 298         if (hammer_limit_recs == 0) {
 299                 hammer_limit_recs = nbuf * 25;
 300                 n = kmalloc_limit(M_HAMMER) / 512;
 301                 if (hammer_limit_recs > n)
 302                         hammer_limit_recs = n;
 303         }
 304         if (hammer_limit_dirtybufspace == 0) {
 305                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 306                 if (hammer_limit_dirtybufspace < 100)
 307                         hammer_limit_dirtybufspace = 100;
 308         }
 309
 310         /*
 311          * Set reasonable limits to maintain an I/O pipeline.  This is
 312          * used by the flush code which explicitly initiates I/O, and
 313          * is per-mount.
 314          *
 315          * The system-driven buffer cache uses vfs.lorunningspace and
 316          * vfs.hirunningspace globally.
 317          */
 318         if (hammer_limit_running_io == 0)
 319                 hammer_limit_running_io = hammer_limit_dirtybufspace;
 320         if (hammer_limit_running_io > 10 * 1024 * 1024)
 321                 hammer_limit_running_io = 10 * 1024 * 1024;
 322         return(0);
 323 }
 324
 325 static int
 326 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 327                  struct ucred *cred)
 328 {
 329         struct hammer_mount_info info;
 330         hammer_mount_t hmp;
 331         hammer_volume_t rootvol;
 332         struct vnode *rootvp;
 333         struct vnode *devvp = NULL;
 334         const char *upath;      /* volume name in userspace */
 335         char *path;             /* volume name in system space */
 336         int error;
 337         int i;
 338         int master_id;
 339         char *next_volume_ptr = NULL;
 340
 341         /*
 342          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 343          */
 344         if (mntpt == NULL) {
 345                 bzero(&info, sizeof(info));
 346                 info.asof = 0;
 347                 info.hflags = 0;
 348                 info.nvolumes = 1;
 349
 350                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 351
 352                 /* Count number of volumes separated by ':' */
 353                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 354                         if (*p == ':') {
 355                                 ++info.nvolumes;
 356                         }
 357                 }
 358
 359                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 360         } else {
 361                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 362                         return (error);
 363         }
 364
 365         /*
 366          * updating or new mount
 367          */
 368         if (mp->mnt_flag & MNT_UPDATE) {
 369                 hmp = (void *)mp->mnt_data;
 370                 KKASSERT(hmp != NULL);
 371         } else {
 372                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 373                         return (EINVAL);
 374                 hmp = NULL;
 375         }
 376
 377         /*
 378          * master-id validation.  The master id may not be changed by a
 379          * mount update.
 380          */
 381         if (info.hflags & HMNT_MASTERID) {
 382                 if (hmp && hmp->master_id != info.master_id) {
 383                         kprintf("hammer: cannot change master id "
 384                                 "with mount update\n");
 385                         return(EINVAL);
 386                 }
 387                 master_id = info.master_id;
 388                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 389                         return (EINVAL);
 390         } else {
 391                 if (hmp)
 392                         master_id = hmp->master_id;
 393                 else
 394                         master_id = 0;
 395         }
 396
 397         /*
 398          * Interal mount data structure
 399          */
 400         if (hmp == NULL) {
 401                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 402                 mp->mnt_data = (qaddr_t)hmp;
 403                 hmp->mp = mp;
 404                 /*TAILQ_INIT(&hmp->recycle_list);*/
 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 = 0x00000000U;
 418                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 419                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 420                 hmp->root_btree_beg.create_tid = 1;
 421                 hmp->root_btree_beg.delete_tid = 1;
 422                 hmp->root_btree_beg.rec_type = 0;
 423                 hmp->root_btree_beg.obj_type = 0;
 424
 425                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 426                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 427                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 428                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 429                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 430                 hmp->root_btree_end.rec_type = 0xFFFFU;
 431                 hmp->root_btree_end.obj_type = 0;
 432
 433                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 434                 hmp->krate.count = -16; /* initial burst */
 435
 436                 hmp->sync_lock.refs = 1;
 437                 hmp->free_lock.refs = 1;
 438                 hmp->undo_lock.refs = 1;
 439                 hmp->blkmap_lock.refs = 1;
 440                 hmp->snapshot_lock.refs = 1;
 441                 hmp->volume_lock.refs = 1;
 442
 443                 TAILQ_INIT(&hmp->delay_list);
 444                 TAILQ_INIT(&hmp->flush_group_list);
 445                 TAILQ_INIT(&hmp->objid_cache_list);
 446                 TAILQ_INIT(&hmp->undo_lru_list);
 447                 TAILQ_INIT(&hmp->reclaim_list);
 448         }
 449         hmp->hflags &= ~HMNT_USERFLAGS;
 450         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 451
 452         hmp->master_id = master_id;
 453
 454         if (info.asof) {
 455                 mp->mnt_flag |= MNT_RDONLY;
 456                 hmp->asof = info.asof;
 457         } else {
 458                 hmp->asof = HAMMER_MAX_TID;
 459         }
 460
 461         hmp->volume_to_remove = -1;
 462
 463         /*
 464          * Re-open read-write if originally read-only, or vise-versa.
 465          *
 466          * When going from read-only to read-write execute the stage2
 467          * recovery if it has not already been run.
 468          */
 469         if (mp->mnt_flag & MNT_UPDATE) {
 470                 error = 0;
 471                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 472                         kprintf("HAMMER read-only -> read-write\n");
 473                         hmp->ronly = 0;
 474                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 475                                 hammer_adjust_volume_mode, NULL);
 476                         rootvol = hammer_get_root_volume(hmp, &error);
 477                         if (rootvol) {
 478                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 479                                 error = hammer_recover_stage2(hmp, rootvol);
 480                                 bcopy(rootvol->ondisk->vol0_blockmap,
 481                                       hmp->blockmap,
 482                                       sizeof(hmp->blockmap));
 483                                 hammer_rel_volume(rootvol, 0);
 484                         }
 485                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 486                                 hammer_reload_inode, NULL);
 487                         /* kernel clears MNT_RDONLY */
 488                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 489                         kprintf("HAMMER read-write -> read-only\n");
 490                         hmp->ronly = 1; /* messy */
 491                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 492                                 hammer_reload_inode, NULL);
 493                         hmp->ronly = 0;
 494                         hammer_flusher_sync(hmp);
 495                         hammer_flusher_sync(hmp);
 496                         hammer_flusher_sync(hmp);
 497                         hmp->ronly = 1;
 498                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 499                                 hammer_adjust_volume_mode, NULL);
 500                 }
 501                 return(error);
 502         }
 503
 504         RB_INIT(&hmp->rb_vols_root);
 505         RB_INIT(&hmp->rb_inos_root);
 506         RB_INIT(&hmp->rb_redo_root);
 507         RB_INIT(&hmp->rb_nods_root);
 508         RB_INIT(&hmp->rb_undo_root);
 509         RB_INIT(&hmp->rb_resv_root);
 510         RB_INIT(&hmp->rb_bufs_root);
 511         RB_INIT(&hmp->rb_pfsm_root);
 512
 513         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 514
 515         TAILQ_INIT(&hmp->volu_list);
 516         TAILQ_INIT(&hmp->undo_list);
 517         TAILQ_INIT(&hmp->data_list);
 518         TAILQ_INIT(&hmp->meta_list);
 519         TAILQ_INIT(&hmp->lose_list);
 520         TAILQ_INIT(&hmp->iorun_list);
 521
 522         /*
 523          * Load volumes
 524          */
 525         path = objcache_get(namei_oc, M_WAITOK);
 526         hmp->nvolumes = -1;
 527         for (i = 0; i < info.nvolumes; ++i) {
 528                 if (mntpt == NULL) {
 529                         /*
 530                          * Root mount.
 531                          */
 532                         KKASSERT(next_volume_ptr != NULL);
 533                         strcpy(path, "");
 534                         if (*next_volume_ptr != '/') {
 535                                 /* relative path */
 536                                 strcpy(path, "/dev/");
 537                         }
 538                         int k;
 539                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 540                                 if (*next_volume_ptr == '\0') {
 541                                         break;
 542                                 } else if (*next_volume_ptr == ':') {
 543                                         ++next_volume_ptr;
 544                                         break;
 545                                 } else {
 546                                         path[k] = *next_volume_ptr;
 547                                         ++next_volume_ptr;
 548                                 }
 549                         }
 550                         path[k] = '\0';
 551
 552                         error = 0;
 553                         cdev_t dev = kgetdiskbyname(path);
 554                         error = bdevvp(dev, &devvp);
 555                         if (error) {
 556                                 kprintf("hammer_mountroot: can't find devvp\n");
 557                         }
 558                 } else {
 559                         error = copyin(&info.volumes[i], &upath,
 560                                        sizeof(char *));
 561                         if (error == 0)
 562                                 error = copyinstr(upath, path,
 563                                                   MAXPATHLEN, NULL);
 564                 }
 565                 if (error == 0)
 566                         error = hammer_install_volume(hmp, path, devvp);
 567                 if (error)
 568                         break;
 569         }
 570         objcache_put(namei_oc, path);
 571
 572         /*
 573          * Make sure we found a root volume
 574          */
 575         if (error == 0 && hmp->rootvol == NULL) {
 576                 kprintf("hammer_mount: No root volume found!\n");
 577                 error = EINVAL;
 578         }
 579
 580         /*
 581          * Check that all required volumes are available
 582          */
 583         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 584                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 585                 error = EINVAL;
 586         }
 587
 588         if (error) {
 589                 hammer_free_hmp(mp);
 590                 return (error);
 591         }
 592
 593         /*
 594          * No errors, setup enough of the mount point so we can lookup the
 595          * root vnode.
 596          */
 597         mp->mnt_iosize_max = MAXPHYS;
 598         mp->mnt_kern_flag |= MNTK_FSMID;
 599
 600         /*
 601          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 602          * will acquire a per-mount token prior to entry and release it
 603          * on return, so even if we do not specify it we no longer get
 604          * the BGL regardlless of how we are flagged.
 605          */
 606         mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE |
 607                              MNTK_IN_MPSAFE;
 608
 609         /*
 610          * note: f_iosize is used by vnode_pager_haspage() when constructing
 611          * its VOP_BMAP call.
 612          */
 613         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 614         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 615
 616         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 617         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 618
 619         mp->mnt_maxsymlinklen = 255;
 620         mp->mnt_flag |= MNT_LOCAL;
 621
 622         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 623         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 624         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 625
 626         /*
 627          * The root volume's ondisk pointer is only valid if we hold a
 628          * reference to it.
 629          */
 630         rootvol = hammer_get_root_volume(hmp, &error);
 631         if (error)
 632                 goto failed;
 633
 634         /*
 635          * Perform any necessary UNDO operations.  The recovery code does
 636          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 637          * and then re-copy it again after recovery is complete.
 638          *
 639          * If this is a read-only mount the UNDO information is retained
 640          * in memory in the form of dirty buffer cache buffers, and not
 641          * written back to the media.
 642          */
 643         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 644               sizeof(hmp->blockmap));
 645
 646         /*
 647          * Check filesystem version
 648          */
 649         hmp->version = rootvol->ondisk->vol_version;
 650         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 651             hmp->version > HAMMER_VOL_VERSION_MAX) {
 652                 kprintf("HAMMER: mount unsupported fs version %d\n",
 653                         hmp->version);
 654                 error = ERANGE;
 655                 goto done;
 656         }
 657
 658         /*
 659          * The undo_rec_limit limits the size of flush groups to avoid
 660          * blowing out the UNDO FIFO.  This calculation is typically in
 661          * the tens of thousands and is designed primarily when small
 662          * HAMMER filesystems are created.
 663          */
 664         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 665         if (hammer_debug_general & 0x0001)
 666                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 667
 668         /*
 669          * NOTE: Recover stage1 not only handles meta-data recovery, it
 670          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 671          */
 672         error = hammer_recover_stage1(hmp, rootvol);
 673         if (error) {
 674                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 675                 goto done;
 676         }
 677
 678         /*
 679          * Finish setup now that we have a good root volume.
 680          *
 681          * The top 16 bits of fsid.val[1] is a pfs id.
 682          */
 683         ksnprintf(mp->mnt_stat.f_mntfromname,
 684                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 685                   rootvol->ondisk->vol_name);
 686         mp->mnt_stat.f_fsid.val[0] =
 687                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 688         mp->mnt_stat.f_fsid.val[1] =
 689                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 690         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 691
 692         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 693         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 694                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 695
 696         /*
 697          * Certain often-modified fields in the root volume are cached in
 698          * the hammer_mount structure so we do not have to generate lots
 699          * of little UNDO structures for them.
 700          *
 701          * Recopy after recovery.  This also has the side effect of
 702          * setting our cached undo FIFO's first_offset, which serves to
 703          * placemark the FIFO start for the NEXT flush cycle while the
 704          * on-disk first_offset represents the LAST flush cycle.
 705          */
 706         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 707         hmp->flush_tid1 = hmp->next_tid;
 708         hmp->flush_tid2 = hmp->next_tid;
 709         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 710               sizeof(hmp->blockmap));
 711         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 712
 713         hammer_flusher_create(hmp);
 714
 715         /*
 716          * Locate the root directory using the root cluster's B-Tree as a
 717          * starting point.  The root directory uses an obj_id of 1.
 718          *
 719          * FUTURE: Leave the root directory cached referenced but unlocked
 720          * in hmp->rootvp (need to flush it on unmount).
 721          */
 722         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 723         if (error)
 724                 goto done;
 725         vput(rootvp);
 726         /*vn_unlock(hmp->rootvp);*/
 727         if (hmp->ronly == 0)
 728                 error = hammer_recover_stage2(hmp, rootvol);
 729
 730         /*
 731          * If the stage2 recovery fails be sure to clean out all cached
 732          * vnodes before throwing away the mount structure or bad things
 733          * will happen.
 734          */
 735         if (error)
 736                 vflush(mp, 0, 0);
 737
 738 done:
 739         hammer_rel_volume(rootvol, 0);
 740 failed:
 741         /*
 742          * Cleanup and return.
 743          */
 744         if (error)
 745                 hammer_free_hmp(mp);
 746         return (error);
 747 }
 748
 749 static int
 750 hammer_vfs_unmount(struct mount *mp, int mntflags)
 751 {
 752 #if 0
 753         struct hammer_mount *hmp = (void *)mp->mnt_data;
 754 #endif
 755         int flags;
 756         int error;
 757
 758         /*
 759          * Clean out the vnodes
 760          */
 761         flags = 0;
 762         if (mntflags & MNT_FORCE)
 763                 flags |= FORCECLOSE;
 764         if ((error = vflush(mp, 0, flags)) != 0)
 765                 return (error);
 766
 767         /*
 768          * Clean up the internal mount structure and related entities.  This
 769          * may issue I/O.
 770          */
 771         hammer_free_hmp(mp);
 772         return(0);
 773 }
 774
 775 /*
 776  * Clean up the internal mount structure and disassociate it from the mount.
 777  * This may issue I/O.
 778  */
 779 static void
 780 hammer_free_hmp(struct mount *mp)
 781 {
 782         struct hammer_mount *hmp = (void *)mp->mnt_data;
 783         hammer_flush_group_t flg;
 784         int count;
 785         int dummy;
 786
 787         /*
 788          * Flush anything dirty.  This won't even run if the
 789          * filesystem errored-out.
 790          */
 791         count = 0;
 792         while (hammer_flusher_haswork(hmp)) {
 793                 hammer_flusher_sync(hmp);
 794                 ++count;
 795                 if (count >= 5) {
 796                         if (count == 5)
 797                                 kprintf("HAMMER: umount flushing.");
 798                         else
 799                                 kprintf(".");
 800                         tsleep(&dummy, 0, "hmrufl", hz);
 801                 }
 802                 if (count == 30) {
 803                         kprintf("giving up\n");
 804                         break;
 805                 }
 806         }
 807         if (count >= 5 && count < 30)
 808                 kprintf("\n");
 809
 810         /*
 811          * If the mount had a critical error we have to destroy any
 812          * remaining inodes before we can finish cleaning up the flusher.
 813          */
 814         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 815                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 816                         hammer_destroy_inode_callback, NULL);
 817         }
 818
 819         /*
 820          * There shouldn't be any inodes left now and any left over
 821          * flush groups should now be empty.
 822          */
 823         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 824         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 825                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 826                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 827                 if (flg->refs) {
 828                         kprintf("HAMMER: Warning, flush_group %p was "
 829                                 "not empty on umount!\n", flg);
 830                 }
 831                 kfree(flg, hmp->m_misc);
 832         }
 833
 834         /*
 835          * We can finally destroy the flusher
 836          */
 837         hammer_flusher_destroy(hmp);
 838
 839         /*
 840          * We may have held recovered buffers due to a read-only mount.
 841          * These must be discarded.
 842          */
 843         if (hmp->ronly)
 844                 hammer_recover_flush_buffers(hmp, NULL, -1);
 845
 846         /*
 847          * Unload buffers and then volumes
 848          */
 849         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 850                 hammer_unload_buffer, NULL);
 851         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 852                 hammer_unload_volume, NULL);
 853
 854         mp->mnt_data = NULL;
 855         mp->mnt_flag &= ~MNT_LOCAL;
 856         hmp->mp = NULL;
 857         hammer_destroy_objid_cache(hmp);
 858         kmalloc_destroy(&hmp->m_misc);
 859         kmalloc_destroy(&hmp->m_inodes);
 860         kfree(hmp, M_HAMMER);
 861 }
 862
 863 /*
 864  * Report critical errors.  ip may be NULL.
 865  */
 866 void
 867 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 868                       int error, const char *msg)
 869 {
 870         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 871
 872         krateprintf(&hmp->krate,
 873                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 874                     hmp->mp->mnt_stat.f_mntfromname,
 875                     (intmax_t)(ip ? ip->obj_id : -1),
 876                     error, msg);
 877
 878         if (hmp->ronly == 0) {
 879                 hmp->ronly = 2;         /* special errored read-only mode */
 880                 hmp->mp->mnt_flag |= MNT_RDONLY;
 881                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 882                         hmp->mp->mnt_stat.f_mntfromname);
 883         }
 884         hmp->error = error;
 885         if (hammer_debug_critical)
 886                 Debugger("Entering debugger");
 887 }
 888
 889
 890 /*
 891  * Obtain a vnode for the specified inode number.  An exclusively locked
 892  * vnode is returned.
 893  */
 894 int
 895 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 896                 ino_t ino, struct vnode **vpp)
 897 {
 898         struct hammer_transaction trans;
 899         struct hammer_mount *hmp = (void *)mp->mnt_data;
 900         struct hammer_inode *ip;
 901         int error;
 902         u_int32_t localization;
 903
 904         hammer_simple_transaction(&trans, hmp);
 905
 906         /*
 907          * If a directory vnode is supplied (mainly NFS) then we can acquire
 908          * the PFS domain from it.  Otherwise we would only be able to vget
 909          * inodes in the root PFS.
 910          */
 911         if (dvp) {
 912                 localization = HAMMER_DEF_LOCALIZATION +
 913                                 VTOI(dvp)->obj_localization;
 914         } else {
 915                 localization = HAMMER_DEF_LOCALIZATION;
 916         }
 917
 918         /*
 919          * Lookup the requested HAMMER inode.  The structure must be
 920          * left unlocked while we manipulate the related vnode to avoid
 921          * a deadlock.
 922          */
 923         ip = hammer_get_inode(&trans, NULL, ino,
 924                               hmp->asof, localization,
 925                               0, &error);
 926         if (ip == NULL) {
 927                 *vpp = NULL;
 928                 hammer_done_transaction(&trans);
 929                 return(error);
 930         }
 931         error = hammer_get_vnode(ip, vpp);
 932         hammer_rel_inode(ip, 0);
 933         hammer_done_transaction(&trans);
 934         return (error);
 935 }
 936
 937 /*
 938  * Return the root vnode for the filesystem.
 939  *
 940  * HAMMER stores the root vnode in the hammer_mount structure so
 941  * getting it is easy.
 942  */
 943 static int
 944 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 945 {
 946 #if 0
 947         struct hammer_mount *hmp = (void *)mp->mnt_data;
 948 #endif
 949         int error;
 950
 951         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 952         return (error);
 953 }
 954
 955 static int
 956 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 957 {
 958         struct hammer_mount *hmp = (void *)mp->mnt_data;
 959         hammer_volume_t volume;
 960         hammer_volume_ondisk_t ondisk;
 961         int error;
 962         int64_t bfree;
 963         int64_t breserved;
 964
 965         volume = hammer_get_root_volume(hmp, &error);
 966         if (error)
 967                 return(error);
 968         ondisk = volume->ondisk;
 969
 970         /*
 971          * Basic stats
 972          */
 973         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 974         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 975         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 976         hammer_rel_volume(volume, 0);
 977
 978         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 979         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 980         if (mp->mnt_stat.f_files < 0)
 981                 mp->mnt_stat.f_files = 0;
 982
 983         *sbp = mp->mnt_stat;
 984         return(0);
 985 }
 986
 987 static int
 988 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 989 {
 990         struct hammer_mount *hmp = (void *)mp->mnt_data;
 991         hammer_volume_t volume;
 992         hammer_volume_ondisk_t ondisk;
 993         int error;
 994         int64_t bfree;
 995         int64_t breserved;
 996
 997         volume = hammer_get_root_volume(hmp, &error);
 998         if (error)
 999                 return(error);
1000         ondisk = volume->ondisk;
1001
1002         /*
1003          * Basic stats
1004          */
1005         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1006         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1007         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1008         hammer_rel_volume(volume, 0);
1009
1010         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1011         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1012         if (mp->mnt_vstat.f_files < 0)
1013                 mp->mnt_vstat.f_files = 0;
1014         *sbp = mp->mnt_vstat;
1015         return(0);
1016 }
1017
1018 /*
1019  * Sync the filesystem.  Currently we have to run it twice, the second
1020  * one will advance the undo start index to the end index, so if a crash
1021  * occurs no undos will be run on mount.
1022  *
1023  * We do not sync the filesystem if we are called from a panic.  If we did
1024  * we might end up blowing up a sync that was already in progress.
1025  */
1026 static int
1027 hammer_vfs_sync(struct mount *mp, int waitfor)
1028 {
1029         struct hammer_mount *hmp = (void *)mp->mnt_data;
1030         int error;
1031
1032         if (panicstr == NULL) {
1033                 error = hammer_sync_hmp(hmp, waitfor);
1034         } else {
1035                 error = EIO;
1036         }
1037         return (error);
1038 }
1039
1040 /*
1041  * Convert a vnode to a file handle.
1042  */
1043 static int
1044 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1045 {
1046         hammer_inode_t ip;
1047
1048         KKASSERT(MAXFIDSZ >= 16);
1049         ip = VTOI(vp);
1050         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1051         fhp->fid_ext = ip->obj_localization >> 16;
1052         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1053         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1054         return(0);
1055 }
1056
1057
1058 /*
1059  * Convert a file handle back to a vnode.
1060  *
1061  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1062  * null mount.
1063  */
1064 static int
1065 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1066                   struct fid *fhp, struct vnode **vpp)
1067 {
1068         struct hammer_transaction trans;
1069         struct hammer_inode *ip;
1070         struct hammer_inode_info info;
1071         int error;
1072         u_int32_t localization;
1073
1074         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1075         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1076         if (rootvp)
1077                 localization = VTOI(rootvp)->obj_localization;
1078         else
1079                 localization = (u_int32_t)fhp->fid_ext << 16;
1080
1081         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1082
1083         /*
1084          * Get/allocate the hammer_inode structure.  The structure must be
1085          * unlocked while we manipulate the related vnode to avoid a
1086          * deadlock.
1087          */
1088         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1089                               info.obj_asof, localization, 0, &error);
1090         if (ip) {
1091                 error = hammer_get_vnode(ip, vpp);
1092                 hammer_rel_inode(ip, 0);
1093         } else {
1094                 *vpp = NULL;
1095         }
1096         hammer_done_transaction(&trans);
1097         return (error);
1098 }
1099
1100 static int
1101 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1102                     int *exflagsp, struct ucred **credanonp)
1103 {
1104         hammer_mount_t hmp = (void *)mp->mnt_data;
1105         struct netcred *np;
1106         int error;
1107
1108         np = vfs_export_lookup(mp, &hmp->export, nam);
1109         if (np) {
1110                 *exflagsp = np->netc_exflags;
1111                 *credanonp = &np->netc_anon;
1112                 error = 0;
1113         } else {
1114                 error = EACCES;
1115         }
1116         return (error);
1117
1118 }
1119
1120 int
1121 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1122 {
1123         hammer_mount_t hmp = (void *)mp->mnt_data;
1124         int error;
1125
1126         switch(op) {
1127         case MOUNTCTL_SET_EXPORT:
1128                 error = vfs_export(mp, &hmp->export, export);
1129                 break;
1130         default:
1131                 error = EOPNOTSUPP;
1132                 break;
1133         }
1134         return(error);
1135 }
1136