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/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/malloc.h>
  41 #include <sys/nlookup.h>
  42 #include <sys/fcntl.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/buf.h>
  45 #include <sys/buf2.h>
  46 #include "hammer.h"
  47
  48 /*
  49  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
  50  *        in conditionals.
  51  */
  52 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  53 int hammer_debug_io;
  54 int hammer_debug_general;
  55 int hammer_debug_debug = 1;             /* medium-error panics */
  56 int hammer_debug_inode;
  57 int hammer_debug_locks;
  58 int hammer_debug_btree;
  59 int hammer_debug_tid;
  60 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  61 int hammer_debug_recover_faults;
  62 int hammer_debug_critical;              /* non-zero enter debugger on error */
  63 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  64 int hammer_live_dedup = 0;
  65 int hammer_tdmux_ticks;
  66 int hammer_count_fsyncs;
  67 int hammer_count_inodes;
  68 int hammer_count_iqueued;
  69 int hammer_count_reclaims;
  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 = 2048;     /* per inode */
 107 int hammer_limit_reclaims;
 108 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
 109 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 110 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
 111 int hammer_bio_count;
 112 int hammer_verify_zone;
 113 int hammer_verify_data = 1;
 114 int hammer_write_mode;
 115 int hammer_double_buffer;
 116 int hammer_yield_check = 16;
 117 int hammer_fsync_mode = 3;
 118 int64_t hammer_contention_count;
 119 int64_t hammer_zone_limit;
 120
 121 /*
 122  * Live dedup debug counters (sysctls are writable so that counters
 123  * can be reset from userspace).
 124  */
 125 int64_t hammer_live_dedup_vnode_bcmps = 0;
 126 int64_t hammer_live_dedup_device_bcmps = 0;
 127 int64_t hammer_live_dedup_findblk_failures = 0;
 128 int64_t hammer_live_dedup_bmap_saves = 0;
 129
 130
 131 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 132
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 134            &hammer_supported_version, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 136            &hammer_debug_general, 0, "");
 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 138            &hammer_debug_io, 0, "");
 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 140            &hammer_debug_debug, 0, "");
 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 142            &hammer_debug_inode, 0, "");
 143 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 144            &hammer_debug_locks, 0, "");
 145 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 146            &hammer_debug_btree, 0, "");
 147 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 148            &hammer_debug_tid, 0, "");
 149 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 150            &hammer_debug_recover, 0, "");
 151 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 152            &hammer_debug_recover_faults, 0, "");
 153 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
 154            &hammer_debug_critical, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 156            &hammer_cluster_enable, 0, "");
 157 /*
 158  * 0 - live dedup is disabled
 159  * 1 - dedup cache is populated on reads only
 160  * 2 - dedup cache is populated on both reads and writes
 161  */
 162 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
 163            &hammer_live_dedup, 0, "Enable live dedup");
 164 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 165            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 166
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 168            &hammer_limit_dirtybufspace, 0, "");
 169 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
 170            &hammer_limit_running_io, 0, "");
 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 172            &hammer_limit_recs, 0, "");
 173 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 174            &hammer_limit_inode_recs, 0, "");
 175 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 176            &hammer_limit_reclaims, 0, "");
 177 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 178            &hammer_live_dedup_cache_size, 0,
 179            "Number of cache entries");
 180 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 181            &hammer_limit_redo, 0, "");
 182
 183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 184            &hammer_count_fsyncs, 0, "");
 185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 186            &hammer_count_inodes, 0, "");
 187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 188            &hammer_count_iqueued, 0, "");
 189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 190            &hammer_count_reclaims, 0, "");
 191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 192            &hammer_count_records, 0, "");
 193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 194            &hammer_count_record_datas, 0, "");
 195 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 196            &hammer_count_volumes, 0, "");
 197 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 198            &hammer_count_buffers, 0, "");
 199 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 200            &hammer_count_nodes, 0, "");
 201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 202            &hammer_count_extra_space_used, 0, "");
 203
 204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 205            &hammer_stats_btree_searches, 0, "");
 206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 207            &hammer_stats_btree_lookups, 0, "");
 208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 209            &hammer_stats_btree_inserts, 0, "");
 210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 211            &hammer_stats_btree_deletes, 0, "");
 212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 213            &hammer_stats_btree_elements, 0, "");
 214 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 215            &hammer_stats_btree_splits, 0, "");
 216 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 217            &hammer_stats_btree_iterations, 0, "");
 218 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 219            &hammer_stats_btree_root_iterations, 0, "");
 220 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 221            &hammer_stats_record_iterations, 0, "");
 222
 223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 224            &hammer_stats_file_read, 0, "");
 225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 226            &hammer_stats_file_write, 0, "");
 227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 228            &hammer_stats_file_iopsr, 0, "");
 229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 230            &hammer_stats_file_iopsw, 0, "");
 231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 232            &hammer_stats_disk_read, 0, "");
 233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 234            &hammer_stats_disk_write, 0, "");
 235 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 236            &hammer_stats_inode_flushes, 0, "");
 237 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 238            &hammer_stats_commits, 0, "");
 239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 240            &hammer_stats_undo, 0, "");
 241 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 242            &hammer_stats_redo, 0, "");
 243
 244 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 245             &hammer_live_dedup_vnode_bcmps, 0,
 246             "successful vnode buffer comparisons");
 247 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 248             &hammer_live_dedup_device_bcmps, 0,
 249             "successful device buffer comparisons");
 250 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 251             &hammer_live_dedup_findblk_failures, 0,
 252             "block lookup failures for comparison");
 253 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 254             &hammer_live_dedup_bmap_saves, 0,
 255             "useful physical block lookups");
 256
 257 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 258            &hammer_count_dirtybufspace, 0, "");
 259 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 260            &hammer_count_refedbufs, 0, "");
 261 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 262            &hammer_count_reservations, 0, "");
 263 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 264            &hammer_count_io_running_read, 0, "");
 265 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 266            &hammer_count_io_locked, 0, "");
 267 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 268            &hammer_count_io_running_write, 0, "");
 269 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 270            &hammer_zone_limit, 0, "");
 271 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 272            &hammer_contention_count, 0, "");
 273 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 274            &hammer_autoflush, 0, "");
 275 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 276            &hammer_verify_zone, 0, "");
 277 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 278            &hammer_verify_data, 0, "");
 279 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 280            &hammer_write_mode, 0, "");
 281 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 282            &hammer_double_buffer, 0, "");
 283 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 284            &hammer_yield_check, 0, "");
 285 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 286            &hammer_fsync_mode, 0, "");
 287
 288 /* KTR_INFO_MASTER(hammer); */
 289
 290 /*
 291  * VFS ABI
 292  */
 293 static void     hammer_free_hmp(struct mount *mp);
 294
 295 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 296                                 struct ucred *cred);
 297 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 298 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 299 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 300                                 struct ucred *cred);
 301 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 302                                 struct ucred *cred);
 303 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 304 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 305                                 ino_t ino, struct vnode **vpp);
 306 static int      hammer_vfs_init(struct vfsconf *conf);
 307 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 308                                 struct fid *fhp, struct vnode **vpp);
 309 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 310 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 311                                 int *exflagsp, struct ucred **credanonp);
 312
 313
 314 static struct vfsops hammer_vfsops = {
 315         .vfs_mount      = hammer_vfs_mount,
 316         .vfs_unmount    = hammer_vfs_unmount,
 317         .vfs_root       = hammer_vfs_root,
 318         .vfs_statfs     = hammer_vfs_statfs,
 319         .vfs_statvfs    = hammer_vfs_statvfs,
 320         .vfs_sync       = hammer_vfs_sync,
 321         .vfs_vget       = hammer_vfs_vget,
 322         .vfs_init       = hammer_vfs_init,
 323         .vfs_vptofh     = hammer_vfs_vptofh,
 324         .vfs_fhtovp     = hammer_vfs_fhtovp,
 325         .vfs_checkexp   = hammer_vfs_checkexp
 326 };
 327
 328 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 329
 330 VFS_SET(hammer_vfsops, hammer, 0);
 331 MODULE_VERSION(hammer, 1);
 332
 333 static int
 334 hammer_vfs_init(struct vfsconf *conf)
 335 {
 336         int n;
 337
 338         /*
 339          * Wait up to this long for an exclusive deadlock to clear
 340          * before acquiring a new shared lock on the ip.  The deadlock
 341          * may have occured on a b-tree node related to the ip.
 342          */
 343         if (hammer_tdmux_ticks == 0)
 344                 hammer_tdmux_ticks = hz / 5;
 345
 346         /*
 347          * Autosize
 348          */
 349         if (hammer_limit_recs == 0) {
 350                 hammer_limit_recs = nbuf * 25;
 351                 n = kmalloc_limit(M_HAMMER) / 512;
 352                 if (hammer_limit_recs > n)
 353                         hammer_limit_recs = n;
 354         }
 355         if (hammer_limit_dirtybufspace == 0) {
 356                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 357                 if (hammer_limit_dirtybufspace < 100)
 358                         hammer_limit_dirtybufspace = 100;
 359         }
 360
 361         /*
 362          * Set reasonable limits to maintain an I/O pipeline.  This is
 363          * used by the flush code which explicitly initiates I/O, and
 364          * is per-mount.
 365          *
 366          * The system-driven buffer cache uses vfs.lorunningspace and
 367          * vfs.hirunningspace globally.
 368          */
 369         if (hammer_limit_running_io == 0)
 370                 hammer_limit_running_io = hammer_limit_dirtybufspace;
 371
 372         if (hammer_limit_running_io > 10 * 1024 * 1024)
 373                 hammer_limit_running_io = 10 * 1024 * 1024;
 374
 375         /*
 376          * The hammer_inode structure detaches from the vnode on reclaim.
 377          * This limits the number of inodes in this state to prevent a
 378          * memory pool blowout.
 379          */
 380         if (hammer_limit_reclaims == 0)
 381                 hammer_limit_reclaims = desiredvnodes / 10;
 382
 383         return(0);
 384 }
 385
 386 static int
 387 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 388                  struct ucred *cred)
 389 {
 390         struct hammer_mount_info info;
 391         hammer_mount_t hmp;
 392         hammer_volume_t rootvol;
 393         struct vnode *rootvp;
 394         struct vnode *devvp = NULL;
 395         const char *upath;      /* volume name in userspace */
 396         char *path;             /* volume name in system space */
 397         int error;
 398         int i;
 399         int master_id;
 400         char *next_volume_ptr = NULL;
 401
 402         /*
 403          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 404          */
 405         if (mntpt == NULL) {
 406                 bzero(&info, sizeof(info));
 407                 info.asof = 0;
 408                 info.hflags = 0;
 409                 info.nvolumes = 1;
 410
 411                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 412
 413                 /* Count number of volumes separated by ':' */
 414                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 415                         if (*p == ':') {
 416                                 ++info.nvolumes;
 417                         }
 418                 }
 419
 420                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 421         } else {
 422                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 423                         return (error);
 424         }
 425
 426         /*
 427          * updating or new mount
 428          */
 429         if (mp->mnt_flag & MNT_UPDATE) {
 430                 hmp = (void *)mp->mnt_data;
 431                 KKASSERT(hmp != NULL);
 432         } else {
 433                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 434                         return (EINVAL);
 435                 hmp = NULL;
 436         }
 437
 438         /*
 439          * master-id validation.  The master id may not be changed by a
 440          * mount update.
 441          */
 442         if (info.hflags & HMNT_MASTERID) {
 443                 if (hmp && hmp->master_id != info.master_id) {
 444                         kprintf("hammer: cannot change master id "
 445                                 "with mount update\n");
 446                         return(EINVAL);
 447                 }
 448                 master_id = info.master_id;
 449                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 450                         return (EINVAL);
 451         } else {
 452                 if (hmp)
 453                         master_id = hmp->master_id;
 454                 else
 455                         master_id = 0;
 456         }
 457
 458         /*
 459          * Internal mount data structure
 460          */
 461         if (hmp == NULL) {
 462                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 463                 mp->mnt_data = (qaddr_t)hmp;
 464                 hmp->mp = mp;
 465                 /*TAILQ_INIT(&hmp->recycle_list);*/
 466
 467                 /*
 468                  * Make sure kmalloc type limits are set appropriately.
 469                  *
 470                  * Our inode kmalloc group is sized based on maxvnodes
 471                  * (controlled by the system, not us).
 472                  */
 473                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 474                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 475
 476                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 477
 478                 hmp->root_btree_beg.localization = 0x00000000U;
 479                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 480                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 481                 hmp->root_btree_beg.create_tid = 1;
 482                 hmp->root_btree_beg.delete_tid = 1;
 483                 hmp->root_btree_beg.rec_type = 0;
 484                 hmp->root_btree_beg.obj_type = 0;
 485
 486                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 487                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 488                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 489                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 490                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 491                 hmp->root_btree_end.rec_type = 0xFFFFU;
 492                 hmp->root_btree_end.obj_type = 0;
 493
 494                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 495                 hmp->krate.count = -16; /* initial burst */
 496
 497                 hmp->sync_lock.refs = 1;
 498                 hmp->free_lock.refs = 1;
 499                 hmp->undo_lock.refs = 1;
 500                 hmp->blkmap_lock.refs = 1;
 501                 hmp->snapshot_lock.refs = 1;
 502                 hmp->volume_lock.refs = 1;
 503
 504                 TAILQ_INIT(&hmp->delay_list);
 505                 TAILQ_INIT(&hmp->flush_group_list);
 506                 TAILQ_INIT(&hmp->objid_cache_list);
 507                 TAILQ_INIT(&hmp->undo_lru_list);
 508                 TAILQ_INIT(&hmp->reclaim_list);
 509
 510                 RB_INIT(&hmp->rb_dedup_crc_root);
 511                 RB_INIT(&hmp->rb_dedup_off_root);
 512                 TAILQ_INIT(&hmp->dedup_lru_list);
 513         }
 514         hmp->hflags &= ~HMNT_USERFLAGS;
 515         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 516
 517         hmp->master_id = master_id;
 518
 519         if (info.asof) {
 520                 mp->mnt_flag |= MNT_RDONLY;
 521                 hmp->asof = info.asof;
 522         } else {
 523                 hmp->asof = HAMMER_MAX_TID;
 524         }
 525
 526         hmp->volume_to_remove = -1;
 527
 528         /*
 529          * Re-open read-write if originally read-only, or vise-versa.
 530          *
 531          * When going from read-only to read-write execute the stage2
 532          * recovery if it has not already been run.
 533          */
 534         if (mp->mnt_flag & MNT_UPDATE) {
 535                 lwkt_gettoken(&hmp->fs_token);
 536                 error = 0;
 537                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 538                         kprintf("HAMMER read-only -> read-write\n");
 539                         hmp->ronly = 0;
 540                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 541                                 hammer_adjust_volume_mode, NULL);
 542                         rootvol = hammer_get_root_volume(hmp, &error);
 543                         if (rootvol) {
 544                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 545                                 error = hammer_recover_stage2(hmp, rootvol);
 546                                 bcopy(rootvol->ondisk->vol0_blockmap,
 547                                       hmp->blockmap,
 548                                       sizeof(hmp->blockmap));
 549                                 hammer_rel_volume(rootvol, 0);
 550                         }
 551                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 552                                 hammer_reload_inode, NULL);
 553                         /* kernel clears MNT_RDONLY */
 554                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 555                         kprintf("HAMMER read-write -> read-only\n");
 556                         hmp->ronly = 1; /* messy */
 557                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 558                                 hammer_reload_inode, NULL);
 559                         hmp->ronly = 0;
 560                         hammer_flusher_sync(hmp);
 561                         hammer_flusher_sync(hmp);
 562                         hammer_flusher_sync(hmp);
 563                         hmp->ronly = 1;
 564                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 565                                 hammer_adjust_volume_mode, NULL);
 566                 }
 567                 lwkt_reltoken(&hmp->fs_token);
 568                 return(error);
 569         }
 570
 571         RB_INIT(&hmp->rb_vols_root);
 572         RB_INIT(&hmp->rb_inos_root);
 573         RB_INIT(&hmp->rb_redo_root);
 574         RB_INIT(&hmp->rb_nods_root);
 575         RB_INIT(&hmp->rb_undo_root);
 576         RB_INIT(&hmp->rb_resv_root);
 577         RB_INIT(&hmp->rb_bufs_root);
 578         RB_INIT(&hmp->rb_pfsm_root);
 579
 580         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 581
 582         RB_INIT(&hmp->volu_root);
 583         RB_INIT(&hmp->undo_root);
 584         RB_INIT(&hmp->data_root);
 585         RB_INIT(&hmp->meta_root);
 586         RB_INIT(&hmp->lose_root);
 587         TAILQ_INIT(&hmp->iorun_list);
 588
 589         lwkt_token_init(&hmp->fs_token, "hammerfs");
 590         lwkt_token_init(&hmp->io_token, "hammerio");
 591
 592         lwkt_gettoken(&hmp->fs_token);
 593
 594         /*
 595          * Load volumes
 596          */
 597         path = objcache_get(namei_oc, M_WAITOK);
 598         hmp->nvolumes = -1;
 599         for (i = 0; i < info.nvolumes; ++i) {
 600                 if (mntpt == NULL) {
 601                         /*
 602                          * Root mount.
 603                          */
 604                         KKASSERT(next_volume_ptr != NULL);
 605                         strcpy(path, "");
 606                         if (*next_volume_ptr != '/') {
 607                                 /* relative path */
 608                                 strcpy(path, "/dev/");
 609                         }
 610                         int k;
 611                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 612                                 if (*next_volume_ptr == '\0') {
 613                                         break;
 614                                 } else if (*next_volume_ptr == ':') {
 615                                         ++next_volume_ptr;
 616                                         break;
 617                                 } else {
 618                                         path[k] = *next_volume_ptr;
 619                                         ++next_volume_ptr;
 620                                 }
 621                         }
 622                         path[k] = '\0';
 623
 624                         error = 0;
 625                         cdev_t dev = kgetdiskbyname(path);
 626                         error = bdevvp(dev, &devvp);
 627                         if (error) {
 628                                 kprintf("hammer_mountroot: can't find devvp\n");
 629                         }
 630                 } else {
 631                         error = copyin(&info.volumes[i], &upath,
 632                                        sizeof(char *));
 633                         if (error == 0)
 634                                 error = copyinstr(upath, path,
 635                                                   MAXPATHLEN, NULL);
 636                 }
 637                 if (error == 0)
 638                         error = hammer_install_volume(hmp, path, devvp);
 639                 if (error)
 640                         break;
 641         }
 642         objcache_put(namei_oc, path);
 643
 644         /*
 645          * Make sure we found a root volume
 646          */
 647         if (error == 0 && hmp->rootvol == NULL) {
 648                 kprintf("hammer_mount: No root volume found!\n");
 649                 error = EINVAL;
 650         }
 651
 652         /*
 653          * Check that all required volumes are available
 654          */
 655         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 656                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 657                 error = EINVAL;
 658         }
 659
 660         if (error) {
 661                 /* called with fs_token held */
 662                 hammer_free_hmp(mp);
 663                 return (error);
 664         }
 665
 666         /*
 667          * No errors, setup enough of the mount point so we can lookup the
 668          * root vnode.
 669          */
 670         mp->mnt_iosize_max = MAXPHYS;
 671         mp->mnt_kern_flag |= MNTK_FSMID;
 672
 673         /*
 674          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
 675          * will acquire a per-mount token prior to entry and release it
 676          * on return, so even if we do not specify it we no longer get
 677          * the BGL regardlless of how we are flagged.
 678          */
 679         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 680         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
 681
 682         /*
 683          * note: f_iosize is used by vnode_pager_haspage() when constructing
 684          * its VOP_BMAP call.
 685          */
 686         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 687         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 688
 689         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 690         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 691
 692         mp->mnt_maxsymlinklen = 255;
 693         mp->mnt_flag |= MNT_LOCAL;
 694
 695         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 696         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 697         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 698
 699         /*
 700          * The root volume's ondisk pointer is only valid if we hold a
 701          * reference to it.
 702          */
 703         rootvol = hammer_get_root_volume(hmp, &error);
 704         if (error)
 705                 goto failed;
 706
 707         /*
 708          * Perform any necessary UNDO operations.  The recovery code does
 709          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 710          * and then re-copy it again after recovery is complete.
 711          *
 712          * If this is a read-only mount the UNDO information is retained
 713          * in memory in the form of dirty buffer cache buffers, and not
 714          * written back to the media.
 715          */
 716         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 717               sizeof(hmp->blockmap));
 718
 719         /*
 720          * Check filesystem version
 721          */
 722         hmp->version = rootvol->ondisk->vol_version;
 723         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 724             hmp->version > HAMMER_VOL_VERSION_MAX) {
 725                 kprintf("HAMMER: mount unsupported fs version %d\n",
 726                         hmp->version);
 727                 error = ERANGE;
 728                 goto done;
 729         }
 730
 731         /*
 732          * The undo_rec_limit limits the size of flush groups to avoid
 733          * blowing out the UNDO FIFO.  This calculation is typically in
 734          * the tens of thousands and is designed primarily when small
 735          * HAMMER filesystems are created.
 736          */
 737         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 738         if (hammer_debug_general & 0x0001)
 739                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 740
 741         /*
 742          * NOTE: Recover stage1 not only handles meta-data recovery, it
 743          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 744          */
 745         error = hammer_recover_stage1(hmp, rootvol);
 746         if (error) {
 747                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 748                 goto done;
 749         }
 750
 751         /*
 752          * Finish setup now that we have a good root volume.
 753          *
 754          * The top 16 bits of fsid.val[1] is a pfs id.
 755          */
 756         ksnprintf(mp->mnt_stat.f_mntfromname,
 757                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 758                   rootvol->ondisk->vol_name);
 759         mp->mnt_stat.f_fsid.val[0] =
 760                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 761         mp->mnt_stat.f_fsid.val[1] =
 762                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 763         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 764
 765         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 766         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 767                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 768
 769         /*
 770          * Certain often-modified fields in the root volume are cached in
 771          * the hammer_mount structure so we do not have to generate lots
 772          * of little UNDO structures for them.
 773          *
 774          * Recopy after recovery.  This also has the side effect of
 775          * setting our cached undo FIFO's first_offset, which serves to
 776          * placemark the FIFO start for the NEXT flush cycle while the
 777          * on-disk first_offset represents the LAST flush cycle.
 778          */
 779         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 780         hmp->flush_tid1 = hmp->next_tid;
 781         hmp->flush_tid2 = hmp->next_tid;
 782         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 783               sizeof(hmp->blockmap));
 784         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 785
 786         hammer_flusher_create(hmp);
 787
 788         /*
 789          * Locate the root directory using the root cluster's B-Tree as a
 790          * starting point.  The root directory uses an obj_id of 1.
 791          *
 792          * FUTURE: Leave the root directory cached referenced but unlocked
 793          * in hmp->rootvp (need to flush it on unmount).
 794          */
 795         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 796         if (error)
 797                 goto done;
 798         vput(rootvp);
 799         /*vn_unlock(hmp->rootvp);*/
 800         if (hmp->ronly == 0)
 801                 error = hammer_recover_stage2(hmp, rootvol);
 802
 803         /*
 804          * If the stage2 recovery fails be sure to clean out all cached
 805          * vnodes before throwing away the mount structure or bad things
 806          * will happen.
 807          */
 808         if (error)
 809                 vflush(mp, 0, 0);
 810
 811 done:
 812         hammer_rel_volume(rootvol, 0);
 813 failed:
 814         /*
 815          * Cleanup and return.
 816          */
 817         if (error) {
 818                 /* called with fs_token held */
 819                 hammer_free_hmp(mp);
 820         } else {
 821                 lwkt_reltoken(&hmp->fs_token);
 822         }
 823         return (error);
 824 }
 825
 826 static int
 827 hammer_vfs_unmount(struct mount *mp, int mntflags)
 828 {
 829         hammer_mount_t hmp = (void *)mp->mnt_data;
 830         int flags;
 831         int error;
 832
 833         /*
 834          * Clean out the vnodes
 835          */
 836         lwkt_gettoken(&hmp->fs_token);
 837         flags = 0;
 838         if (mntflags & MNT_FORCE)
 839                 flags |= FORCECLOSE;
 840         error = vflush(mp, 0, flags);
 841
 842         /*
 843          * Clean up the internal mount structure and related entities.  This
 844          * may issue I/O.
 845          */
 846         if (error == 0) {
 847                 /* called with fs_token held */
 848                 hammer_free_hmp(mp);
 849         } else {
 850                 lwkt_reltoken(&hmp->fs_token);
 851         }
 852         return(error);
 853 }
 854
 855 /*
 856  * Clean up the internal mount structure and disassociate it from the mount.
 857  * This may issue I/O.
 858  *
 859  * Called with fs_token held.
 860  */
 861 static void
 862 hammer_free_hmp(struct mount *mp)
 863 {
 864         hammer_mount_t hmp = (void *)mp->mnt_data;
 865         hammer_flush_group_t flg;
 866         int count;
 867         int dummy;
 868
 869         /*
 870          * Flush anything dirty.  This won't even run if the
 871          * filesystem errored-out.
 872          */
 873         count = 0;
 874         while (hammer_flusher_haswork(hmp)) {
 875                 hammer_flusher_sync(hmp);
 876                 ++count;
 877                 if (count >= 5) {
 878                         if (count == 5)
 879                                 kprintf("HAMMER: umount flushing.");
 880                         else
 881                                 kprintf(".");
 882                         tsleep(&dummy, 0, "hmrufl", hz);
 883                 }
 884                 if (count == 30) {
 885                         kprintf("giving up\n");
 886                         break;
 887                 }
 888         }
 889         if (count >= 5 && count < 30)
 890                 kprintf("\n");
 891
 892         /*
 893          * If the mount had a critical error we have to destroy any
 894          * remaining inodes before we can finish cleaning up the flusher.
 895          */
 896         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 897                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 898                         hammer_destroy_inode_callback, NULL);
 899         }
 900
 901         /*
 902          * There shouldn't be any inodes left now and any left over
 903          * flush groups should now be empty.
 904          */
 905         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 906         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 907                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 908                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 909                 if (flg->refs) {
 910                         kprintf("HAMMER: Warning, flush_group %p was "
 911                                 "not empty on umount!\n", flg);
 912                 }
 913                 kfree(flg, hmp->m_misc);
 914         }
 915
 916         /*
 917          * We can finally destroy the flusher
 918          */
 919         hammer_flusher_destroy(hmp);
 920
 921         /*
 922          * We may have held recovered buffers due to a read-only mount.
 923          * These must be discarded.
 924          */
 925         if (hmp->ronly)
 926                 hammer_recover_flush_buffers(hmp, NULL, -1);
 927
 928         /*
 929          * Unload buffers and then volumes
 930          */
 931         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 932                 hammer_unload_buffer, NULL);
 933         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 934                 hammer_unload_volume, NULL);
 935
 936         mp->mnt_data = NULL;
 937         mp->mnt_flag &= ~MNT_LOCAL;
 938         hmp->mp = NULL;
 939         hammer_destroy_objid_cache(hmp);
 940         hammer_destroy_dedup_cache(hmp);
 941         if (hmp->dedup_free_cache != NULL) {
 942                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 943                 hmp->dedup_free_cache = NULL;
 944         }
 945         kmalloc_destroy(&hmp->m_misc);
 946         kmalloc_destroy(&hmp->m_inodes);
 947         lwkt_reltoken(&hmp->fs_token);
 948         kfree(hmp, M_HAMMER);
 949 }
 950
 951 /*
 952  * Report critical errors.  ip may be NULL.
 953  */
 954 void
 955 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 956                       int error, const char *msg)
 957 {
 958         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 959
 960         krateprintf(&hmp->krate,
 961                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 962                     hmp->mp->mnt_stat.f_mntfromname,
 963                     (intmax_t)(ip ? ip->obj_id : -1),
 964                     error, msg);
 965
 966         if (hmp->ronly == 0) {
 967                 hmp->ronly = 2;         /* special errored read-only mode */
 968                 hmp->mp->mnt_flag |= MNT_RDONLY;
 969                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 970                         hammer_adjust_volume_mode, NULL);
 971                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 972                         hmp->mp->mnt_stat.f_mntfromname);
 973         }
 974         hmp->error = error;
 975         if (hammer_debug_critical)
 976                 Debugger("Entering debugger");
 977 }
 978
 979
 980 /*
 981  * Obtain a vnode for the specified inode number.  An exclusively locked
 982  * vnode is returned.
 983  */
 984 int
 985 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 986                 ino_t ino, struct vnode **vpp)
 987 {
 988         struct hammer_transaction trans;
 989         struct hammer_mount *hmp = (void *)mp->mnt_data;
 990         struct hammer_inode *ip;
 991         int error;
 992         u_int32_t localization;
 993
 994         lwkt_gettoken(&hmp->fs_token);
 995         hammer_simple_transaction(&trans, hmp);
 996
 997         /*
 998          * If a directory vnode is supplied (mainly NFS) then we can acquire
 999          * the PFS domain from it.  Otherwise we would only be able to vget
1000          * inodes in the root PFS.
1001          */
1002         if (dvp) {
1003                 localization = HAMMER_DEF_LOCALIZATION +
1004                                 VTOI(dvp)->obj_localization;
1005         } else {
1006                 localization = HAMMER_DEF_LOCALIZATION;
1007         }
1008
1009         /*
1010          * Lookup the requested HAMMER inode.  The structure must be
1011          * left unlocked while we manipulate the related vnode to avoid
1012          * a deadlock.
1013          */
1014         ip = hammer_get_inode(&trans, NULL, ino,
1015                               hmp->asof, localization,
1016                               0, &error);
1017         if (ip == NULL) {
1018                 *vpp = NULL;
1019         } else {
1020                 error = hammer_get_vnode(ip, vpp);
1021                 hammer_rel_inode(ip, 0);
1022         }
1023         hammer_done_transaction(&trans);
1024         lwkt_reltoken(&hmp->fs_token);
1025         return (error);
1026 }
1027
1028 /*
1029  * Return the root vnode for the filesystem.
1030  *
1031  * HAMMER stores the root vnode in the hammer_mount structure so
1032  * getting it is easy.
1033  */
1034 static int
1035 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1036 {
1037         int error;
1038
1039         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1040         return (error);
1041 }
1042
1043 static int
1044 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1045 {
1046         struct hammer_mount *hmp = (void *)mp->mnt_data;
1047         hammer_volume_t volume;
1048         hammer_volume_ondisk_t ondisk;
1049         int error;
1050         int64_t bfree;
1051         int64_t breserved;
1052
1053         lwkt_gettoken(&hmp->fs_token);
1054         volume = hammer_get_root_volume(hmp, &error);
1055         if (error) {
1056                 lwkt_reltoken(&hmp->fs_token);
1057                 return(error);
1058         }
1059         ondisk = volume->ondisk;
1060
1061         /*
1062          * Basic stats
1063          */
1064         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1065         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1066         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1067         hammer_rel_volume(volume, 0);
1068
1069         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1070         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1071         if (mp->mnt_stat.f_files < 0)
1072                 mp->mnt_stat.f_files = 0;
1073
1074         *sbp = mp->mnt_stat;
1075         lwkt_reltoken(&hmp->fs_token);
1076         return(0);
1077 }
1078
1079 static int
1080 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1081 {
1082         struct hammer_mount *hmp = (void *)mp->mnt_data;
1083         hammer_volume_t volume;
1084         hammer_volume_ondisk_t ondisk;
1085         int error;
1086         int64_t bfree;
1087         int64_t breserved;
1088
1089         lwkt_gettoken(&hmp->fs_token);
1090         volume = hammer_get_root_volume(hmp, &error);
1091         if (error) {
1092                 lwkt_reltoken(&hmp->fs_token);
1093                 return(error);
1094         }
1095         ondisk = volume->ondisk;
1096
1097         /*
1098          * Basic stats
1099          */
1100         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1101         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1102         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1103         hammer_rel_volume(volume, 0);
1104
1105         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1106         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1107         if (mp->mnt_vstat.f_files < 0)
1108                 mp->mnt_vstat.f_files = 0;
1109         *sbp = mp->mnt_vstat;
1110         lwkt_reltoken(&hmp->fs_token);
1111         return(0);
1112 }
1113
1114 /*
1115  * Sync the filesystem.  Currently we have to run it twice, the second
1116  * one will advance the undo start index to the end index, so if a crash
1117  * occurs no undos will be run on mount.
1118  *
1119  * We do not sync the filesystem if we are called from a panic.  If we did
1120  * we might end up blowing up a sync that was already in progress.
1121  */
1122 static int
1123 hammer_vfs_sync(struct mount *mp, int waitfor)
1124 {
1125         struct hammer_mount *hmp = (void *)mp->mnt_data;
1126         int error;
1127
1128         lwkt_gettoken(&hmp->fs_token);
1129         if (panicstr == NULL) {
1130                 error = hammer_sync_hmp(hmp, waitfor);
1131         } else {
1132                 error = EIO;
1133         }
1134         lwkt_reltoken(&hmp->fs_token);
1135         return (error);
1136 }
1137
1138 /*
1139  * Convert a vnode to a file handle.
1140  *
1141  * Accesses read-only fields on already-referenced structures so
1142  * no token is needed.
1143  */
1144 static int
1145 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1146 {
1147         hammer_inode_t ip;
1148
1149         KKASSERT(MAXFIDSZ >= 16);
1150         ip = VTOI(vp);
1151         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1152         fhp->fid_ext = ip->obj_localization >> 16;
1153         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1154         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1155         return(0);
1156 }
1157
1158
1159 /*
1160  * Convert a file handle back to a vnode.
1161  *
1162  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1163  * null mount.
1164  */
1165 static int
1166 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1167                   struct fid *fhp, struct vnode **vpp)
1168 {
1169         hammer_mount_t hmp = (void *)mp->mnt_data;
1170         struct hammer_transaction trans;
1171         struct hammer_inode *ip;
1172         struct hammer_inode_info info;
1173         int error;
1174         u_int32_t localization;
1175
1176         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1177         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1178         if (rootvp)
1179                 localization = VTOI(rootvp)->obj_localization;
1180         else
1181                 localization = (u_int32_t)fhp->fid_ext << 16;
1182
1183         lwkt_gettoken(&hmp->fs_token);
1184         hammer_simple_transaction(&trans, hmp);
1185
1186         /*
1187          * Get/allocate the hammer_inode structure.  The structure must be
1188          * unlocked while we manipulate the related vnode to avoid a
1189          * deadlock.
1190          */
1191         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1192                               info.obj_asof, localization, 0, &error);
1193         if (ip) {
1194                 error = hammer_get_vnode(ip, vpp);
1195                 hammer_rel_inode(ip, 0);
1196         } else {
1197                 *vpp = NULL;
1198         }
1199         hammer_done_transaction(&trans);
1200         lwkt_reltoken(&hmp->fs_token);
1201         return (error);
1202 }
1203
1204 static int
1205 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1206                     int *exflagsp, struct ucred **credanonp)
1207 {
1208         hammer_mount_t hmp = (void *)mp->mnt_data;
1209         struct netcred *np;
1210         int error;
1211
1212         lwkt_gettoken(&hmp->fs_token);
1213         np = vfs_export_lookup(mp, &hmp->export, nam);
1214         if (np) {
1215                 *exflagsp = np->netc_exflags;
1216                 *credanonp = &np->netc_anon;
1217                 error = 0;
1218         } else {
1219                 error = EACCES;
1220         }
1221         lwkt_reltoken(&hmp->fs_token);
1222         return (error);
1223
1224 }
1225
1226 int
1227 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1228 {
1229         hammer_mount_t hmp = (void *)mp->mnt_data;
1230         int error;
1231
1232         lwkt_gettoken(&hmp->fs_token);
1233
1234         switch(op) {
1235         case MOUNTCTL_SET_EXPORT:
1236                 error = vfs_export(mp, &hmp->export, export);
1237                 break;
1238         default:
1239                 error = EOPNOTSUPP;
1240                 break;
1241         }
1242         lwkt_reltoken(&hmp->fs_token);
1243
1244         return(error);
1245 }
1246