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 long hammer_count_dirtybufspace;        /* global */
  98 int hammer_count_refedbufs;             /* global */
  99 int hammer_count_reservations;
 100 long hammer_count_io_running_read;
 101 long hammer_count_io_running_write;
 102 int hammer_count_io_locked;
 103 long hammer_limit_dirtybufspace;        /* per-mount */
 104 int hammer_limit_recs;                  /* as a whole XXX */
 105 int hammer_limit_inode_recs = 2048;     /* per inode */
 106 int hammer_limit_reclaims;
 107 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
 108 int hammer_limit_redo = 4096 * 1024;    /* per inode */
 109 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
 110 int hammer_bio_count;
 111 int hammer_verify_zone;
 112 int hammer_verify_data = 1;
 113 int hammer_write_mode;
 114 int hammer_double_buffer;
 115 int hammer_btree_full_undo = 1;
 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  * LIVE_DEDUP IS DISABLED PERMANENTLY!  This feature appears to cause
 163  * blockmap corruption over time so we've turned it off permanently.
 164  */
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD,
 166            &hammer_live_dedup, 0, "Enable live dedup (experimental)");
 167 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
 168            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
 169
 170 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 171            &hammer_limit_dirtybufspace, 0, "");
 172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 173            &hammer_limit_recs, 0, "");
 174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 175            &hammer_limit_inode_recs, 0, "");
 176 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
 177            &hammer_limit_reclaims, 0, "");
 178 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
 179            &hammer_live_dedup_cache_size, 0,
 180            "Number of cache entries");
 181 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
 182            &hammer_limit_redo, 0, "");
 183
 184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 185            &hammer_count_fsyncs, 0, "");
 186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 187            &hammer_count_inodes, 0, "");
 188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 189            &hammer_count_iqueued, 0, "");
 190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
 191            &hammer_count_reclaims, 0, "");
 192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 193            &hammer_count_records, 0, "");
 194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 195            &hammer_count_record_datas, 0, "");
 196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 197            &hammer_count_volumes, 0, "");
 198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 199            &hammer_count_buffers, 0, "");
 200 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 201            &hammer_count_nodes, 0, "");
 202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 203            &hammer_count_extra_space_used, 0, "");
 204
 205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 206            &hammer_stats_btree_searches, 0, "");
 207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 208            &hammer_stats_btree_lookups, 0, "");
 209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 210            &hammer_stats_btree_inserts, 0, "");
 211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 212            &hammer_stats_btree_deletes, 0, "");
 213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 214            &hammer_stats_btree_elements, 0, "");
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 216            &hammer_stats_btree_splits, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 218            &hammer_stats_btree_iterations, 0, "");
 219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 220            &hammer_stats_btree_root_iterations, 0, "");
 221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 222            &hammer_stats_record_iterations, 0, "");
 223
 224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 225            &hammer_stats_file_read, 0, "");
 226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 227            &hammer_stats_file_write, 0, "");
 228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 229            &hammer_stats_file_iopsr, 0, "");
 230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 231            &hammer_stats_file_iopsw, 0, "");
 232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 233            &hammer_stats_disk_read, 0, "");
 234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 235            &hammer_stats_disk_write, 0, "");
 236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 237            &hammer_stats_inode_flushes, 0, "");
 238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 239            &hammer_stats_commits, 0, "");
 240 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 241            &hammer_stats_undo, 0, "");
 242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
 243            &hammer_stats_redo, 0, "");
 244
 245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
 246             &hammer_live_dedup_vnode_bcmps, 0,
 247             "successful vnode buffer comparisons");
 248 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
 249             &hammer_live_dedup_device_bcmps, 0,
 250             "successful device buffer comparisons");
 251 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
 252             &hammer_live_dedup_findblk_failures, 0,
 253             "block lookup failures for comparison");
 254 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
 255             &hammer_live_dedup_bmap_saves, 0,
 256             "useful physical block lookups");
 257
 258 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 259            &hammer_count_dirtybufspace, 0, "");
 260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 261            &hammer_count_refedbufs, 0, "");
 262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 263            &hammer_count_reservations, 0, "");
 264 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 265            &hammer_count_io_running_read, 0, "");
 266 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 267            &hammer_count_io_locked, 0, "");
 268 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 269            &hammer_count_io_running_write, 0, "");
 270 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 271            &hammer_zone_limit, 0, "");
 272 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 273            &hammer_contention_count, 0, "");
 274 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 275            &hammer_autoflush, 0, "");
 276 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 277            &hammer_verify_zone, 0, "");
 278 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 279            &hammer_verify_data, 0, "");
 280 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 281            &hammer_write_mode, 0, "");
 282 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
 283            &hammer_double_buffer, 0, "");
 284 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
 285            &hammer_btree_full_undo, 0, "");
 286 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 287            &hammer_yield_check, 0, "");
 288 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 289            &hammer_fsync_mode, 0, "");
 290
 291 /* KTR_INFO_MASTER(hammer); */
 292
 293 /*
 294  * VFS ABI
 295  */
 296 static void     hammer_free_hmp(struct mount *mp);
 297
 298 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 299                                 struct ucred *cred);
 300 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 301 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 302 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 303                                 struct ucred *cred);
 304 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 305                                 struct ucred *cred);
 306 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 307 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 308                                 ino_t ino, struct vnode **vpp);
 309 static int      hammer_vfs_init(struct vfsconf *conf);
 310 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 311                                 struct fid *fhp, struct vnode **vpp);
 312 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 313 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 314                                 int *exflagsp, struct ucred **credanonp);
 315
 316
 317 static struct vfsops hammer_vfsops = {
 318         .vfs_mount      = hammer_vfs_mount,
 319         .vfs_unmount    = hammer_vfs_unmount,
 320         .vfs_root       = hammer_vfs_root,
 321         .vfs_statfs     = hammer_vfs_statfs,
 322         .vfs_statvfs    = hammer_vfs_statvfs,
 323         .vfs_sync       = hammer_vfs_sync,
 324         .vfs_vget       = hammer_vfs_vget,
 325         .vfs_init       = hammer_vfs_init,
 326         .vfs_vptofh     = hammer_vfs_vptofh,
 327         .vfs_fhtovp     = hammer_vfs_fhtovp,
 328         .vfs_checkexp   = hammer_vfs_checkexp
 329 };
 330
 331 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 332
 333 VFS_SET(hammer_vfsops, hammer, 0);
 334 MODULE_VERSION(hammer, 1);
 335
 336 static int
 337 hammer_vfs_init(struct vfsconf *conf)
 338 {
 339         long n;
 340
 341         /*
 342          * Wait up to this long for an exclusive deadlock to clear
 343          * before acquiring a new shared lock on the ip.  The deadlock
 344          * may have occured on a b-tree node related to the ip.
 345          */
 346         if (hammer_tdmux_ticks == 0)
 347                 hammer_tdmux_ticks = hz / 5;
 348
 349         /*
 350          * Autosize, but be careful because a hammer filesystem's
 351          * reserve is partially calculated based on dirtybufspace,
 352          * so we simply cannot allow it to get too large.
 353          */
 354         if (hammer_limit_recs == 0) {
 355                 n = nbuf * 25;
 356                 if (n > kmalloc_limit(M_HAMMER) / 512)
 357                         n = kmalloc_limit(M_HAMMER) / 512;
 358                 if (n > 2 * 1024 * 1024)
 359                         n = 2 * 1024 * 1024;
 360                 hammer_limit_recs = (int)n;
 361         }
 362         if (hammer_limit_dirtybufspace == 0) {
 363                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 364                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
 365                         hammer_limit_dirtybufspace = 1024L * 1024;
 366                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
 367                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
 368         }
 369
 370         /*
 371          * The hammer_inode structure detaches from the vnode on reclaim.
 372          * This limits the number of inodes in this state to prevent a
 373          * memory pool blowout.
 374          */
 375         if (hammer_limit_reclaims == 0)
 376                 hammer_limit_reclaims = desiredvnodes / 10;
 377
 378         return(0);
 379 }
 380
 381 static int
 382 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 383                  struct ucred *cred)
 384 {
 385         struct hammer_mount_info info;
 386         hammer_mount_t hmp;
 387         hammer_volume_t rootvol;
 388         struct vnode *rootvp;
 389         struct vnode *devvp = NULL;
 390         const char *upath;      /* volume name in userspace */
 391         char *path;             /* volume name in system space */
 392         int error;
 393         int i;
 394         int master_id;
 395         char *next_volume_ptr = NULL;
 396
 397         /*
 398          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 399          */
 400         if (mntpt == NULL) {
 401                 bzero(&info, sizeof(info));
 402                 info.asof = 0;
 403                 info.hflags = 0;
 404                 info.nvolumes = 1;
 405
 406                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
 407
 408                 /* Count number of volumes separated by ':' */
 409                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
 410                         if (*p == ':') {
 411                                 ++info.nvolumes;
 412                         }
 413                 }
 414
 415                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 416         } else {
 417                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 418                         return (error);
 419         }
 420
 421         /*
 422          * updating or new mount
 423          */
 424         if (mp->mnt_flag & MNT_UPDATE) {
 425                 hmp = (void *)mp->mnt_data;
 426                 KKASSERT(hmp != NULL);
 427         } else {
 428                 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
 429                         return (EINVAL);
 430                 hmp = NULL;
 431         }
 432
 433         /*
 434          * master-id validation.  The master id may not be changed by a
 435          * mount update.
 436          */
 437         if (info.hflags & HMNT_MASTERID) {
 438                 if (hmp && hmp->master_id != info.master_id) {
 439                         kprintf("hammer: cannot change master id "
 440                                 "with mount update\n");
 441                         return(EINVAL);
 442                 }
 443                 master_id = info.master_id;
 444                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 445                         return (EINVAL);
 446         } else {
 447                 if (hmp)
 448                         master_id = hmp->master_id;
 449                 else
 450                         master_id = 0;
 451         }
 452
 453         /*
 454          * Internal mount data structure
 455          */
 456         if (hmp == NULL) {
 457                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 458                 mp->mnt_data = (qaddr_t)hmp;
 459                 hmp->mp = mp;
 460                 /*TAILQ_INIT(&hmp->recycle_list);*/
 461
 462                 /*
 463                  * Make sure kmalloc type limits are set appropriately.
 464                  *
 465                  * Our inode kmalloc group is sized based on maxvnodes
 466                  * (controlled by the system, not us).
 467                  */
 468                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 469                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 470
 471                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
 472
 473                 hmp->root_btree_beg.localization = 0x00000000U;
 474                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 475                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 476                 hmp->root_btree_beg.create_tid = 1;
 477                 hmp->root_btree_beg.delete_tid = 1;
 478                 hmp->root_btree_beg.rec_type = 0;
 479                 hmp->root_btree_beg.obj_type = 0;
 480                 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
 481
 482                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 483                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 484                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 485                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 486                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 487                 hmp->root_btree_end.rec_type = 0xFFFFU;
 488                 hmp->root_btree_end.obj_type = 0;
 489                 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
 490
 491                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 492                 hmp->krate.count = -16; /* initial burst */
 493                 hmp->kdiag.freq = 1;    /* maximum reporting rate (hz) */
 494                 hmp->kdiag.count = -16; /* initial burst */
 495
 496                 hmp->sync_lock.refs = 1;
 497                 hmp->free_lock.refs = 1;
 498                 hmp->undo_lock.refs = 1;
 499                 hmp->blkmap_lock.refs = 1;
 500                 hmp->snapshot_lock.refs = 1;
 501                 hmp->volume_lock.refs = 1;
 502
 503                 TAILQ_INIT(&hmp->delay_list);
 504                 TAILQ_INIT(&hmp->flush_group_list);
 505                 TAILQ_INIT(&hmp->objid_cache_list);
 506                 TAILQ_INIT(&hmp->undo_lru_list);
 507                 TAILQ_INIT(&hmp->reclaim_list);
 508
 509                 RB_INIT(&hmp->rb_dedup_crc_root);
 510                 RB_INIT(&hmp->rb_dedup_off_root);
 511                 TAILQ_INIT(&hmp->dedup_lru_list);
 512         }
 513         hmp->hflags &= ~HMNT_USERFLAGS;
 514         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 515
 516         hmp->master_id = master_id;
 517
 518         if (info.asof) {
 519                 mp->mnt_flag |= MNT_RDONLY;
 520                 hmp->asof = info.asof;
 521         } else {
 522                 hmp->asof = HAMMER_MAX_TID;
 523         }
 524
 525         hmp->volume_to_remove = -1;
 526
 527         /*
 528          * Re-open read-write if originally read-only, or vise-versa.
 529          *
 530          * When going from read-only to read-write execute the stage2
 531          * recovery if it has not already been run.
 532          */
 533         if (mp->mnt_flag & MNT_UPDATE) {
 534                 lwkt_gettoken(&hmp->fs_token);
 535                 error = 0;
 536                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 537                         kprintf("HAMMER read-only -> read-write\n");
 538                         hmp->ronly = 0;
 539                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 540                                 hammer_adjust_volume_mode, NULL);
 541                         rootvol = hammer_get_root_volume(hmp, &error);
 542                         if (rootvol) {
 543                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 544                                 error = hammer_recover_stage2(hmp, rootvol);
 545                                 bcopy(rootvol->ondisk->vol0_blockmap,
 546                                       hmp->blockmap,
 547                                       sizeof(hmp->blockmap));
 548                                 hammer_rel_volume(rootvol, 0);
 549                         }
 550                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 551                                 hammer_reload_inode, NULL);
 552                         /* kernel clears MNT_RDONLY */
 553                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 554                         kprintf("HAMMER read-write -> read-only\n");
 555                         hmp->ronly = 1; /* messy */
 556                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 557                                 hammer_reload_inode, NULL);
 558                         hmp->ronly = 0;
 559                         hammer_flusher_sync(hmp);
 560                         hammer_flusher_sync(hmp);
 561                         hammer_flusher_sync(hmp);
 562                         hmp->ronly = 1;
 563                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 564                                 hammer_adjust_volume_mode, NULL);
 565                 }
 566                 lwkt_reltoken(&hmp->fs_token);
 567                 return(error);
 568         }
 569
 570         RB_INIT(&hmp->rb_vols_root);
 571         RB_INIT(&hmp->rb_inos_root);
 572         RB_INIT(&hmp->rb_redo_root);
 573         RB_INIT(&hmp->rb_nods_root);
 574         RB_INIT(&hmp->rb_undo_root);
 575         RB_INIT(&hmp->rb_resv_root);
 576         RB_INIT(&hmp->rb_bufs_root);
 577         RB_INIT(&hmp->rb_pfsm_root);
 578
 579         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 580
 581         RB_INIT(&hmp->volu_root);
 582         RB_INIT(&hmp->undo_root);
 583         RB_INIT(&hmp->data_root);
 584         RB_INIT(&hmp->meta_root);
 585         RB_INIT(&hmp->lose_root);
 586         TAILQ_INIT(&hmp->iorun_list);
 587
 588         lwkt_token_init(&hmp->fs_token, "hammerfs");
 589         lwkt_token_init(&hmp->io_token, "hammerio");
 590
 591         lwkt_gettoken(&hmp->fs_token);
 592
 593         /*
 594          * Load volumes
 595          */
 596         path = objcache_get(namei_oc, M_WAITOK);
 597         hmp->nvolumes = -1;
 598         for (i = 0; i < info.nvolumes; ++i) {
 599                 if (mntpt == NULL) {
 600                         /*
 601                          * Root mount.
 602                          */
 603                         KKASSERT(next_volume_ptr != NULL);
 604                         strcpy(path, "");
 605                         if (*next_volume_ptr != '/') {
 606                                 /* relative path */
 607                                 strcpy(path, "/dev/");
 608                         }
 609                         int k;
 610                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
 611                                 if (*next_volume_ptr == '\0') {
 612                                         break;
 613                                 } else if (*next_volume_ptr == ':') {
 614                                         ++next_volume_ptr;
 615                                         break;
 616                                 } else {
 617                                         path[k] = *next_volume_ptr;
 618                                         ++next_volume_ptr;
 619                                 }
 620                         }
 621                         path[k] = '\0';
 622
 623                         error = 0;
 624                         cdev_t dev = kgetdiskbyname(path);
 625                         error = bdevvp(dev, &devvp);
 626                         if (error) {
 627                                 kprintf("hammer_mountroot: can't find devvp\n");
 628                         }
 629                 } else {
 630                         error = copyin(&info.volumes[i], &upath,
 631                                        sizeof(char *));
 632                         if (error == 0)
 633                                 error = copyinstr(upath, path,
 634                                                   MAXPATHLEN, NULL);
 635                 }
 636                 if (error == 0)
 637                         error = hammer_install_volume(hmp, path, devvp);
 638                 if (error)
 639                         break;
 640         }
 641         objcache_put(namei_oc, path);
 642
 643         /*
 644          * Make sure we found a root volume
 645          */
 646         if (error == 0 && hmp->rootvol == NULL) {
 647                 kprintf("hammer_mount: No root volume found!\n");
 648                 error = EINVAL;
 649         }
 650
 651         /*
 652          * Check that all required volumes are available
 653          */
 654         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 655                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 656                 error = EINVAL;
 657         }
 658
 659         if (error) {
 660                 /* called with fs_token held */
 661                 hammer_free_hmp(mp);
 662                 return (error);
 663         }
 664
 665         /*
 666          * No errors, setup enough of the mount point so we can lookup the
 667          * root vnode.
 668          */
 669         mp->mnt_iosize_max = MAXPHYS;
 670         mp->mnt_kern_flag |= MNTK_FSMID;
 671         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 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.
 677          */
 678         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
 679         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
 680
 681         /*
 682          * note: f_iosize is used by vnode_pager_haspage() when constructing
 683          * its VOP_BMAP call.
 684          */
 685         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 686         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 687
 688         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 689         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 690
 691         mp->mnt_maxsymlinklen = 255;
 692         mp->mnt_flag |= MNT_LOCAL;
 693
 694         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 695         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 696         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 697
 698         /*
 699          * The root volume's ondisk pointer is only valid if we hold a
 700          * reference to it.
 701          */
 702         rootvol = hammer_get_root_volume(hmp, &error);
 703         if (error)
 704                 goto failed;
 705
 706         /*
 707          * Perform any necessary UNDO operations.  The recovery code does
 708          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 709          * and then re-copy it again after recovery is complete.
 710          *
 711          * If this is a read-only mount the UNDO information is retained
 712          * in memory in the form of dirty buffer cache buffers, and not
 713          * written back to the media.
 714          */
 715         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 716               sizeof(hmp->blockmap));
 717
 718         /*
 719          * Check filesystem version
 720          */
 721         hmp->version = rootvol->ondisk->vol_version;
 722         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 723             hmp->version > HAMMER_VOL_VERSION_MAX) {
 724                 kprintf("HAMMER: mount unsupported fs version %d\n",
 725                         hmp->version);
 726                 error = ERANGE;
 727                 goto done;
 728         }
 729
 730         /*
 731          * The undo_rec_limit limits the size of flush groups to avoid
 732          * blowing out the UNDO FIFO.  This calculation is typically in
 733          * the tens of thousands and is designed primarily when small
 734          * HAMMER filesystems are created.
 735          */
 736         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 737         if (hammer_debug_general & 0x0001)
 738                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 739
 740         /*
 741          * NOTE: Recover stage1 not only handles meta-data recovery, it
 742          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 743          */
 744         error = hammer_recover_stage1(hmp, rootvol);
 745         if (error) {
 746                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 747                 goto done;
 748         }
 749
 750         /*
 751          * Finish setup now that we have a good root volume.
 752          *
 753          * The top 16 bits of fsid.val[1] is a pfs id.
 754          */
 755         ksnprintf(mp->mnt_stat.f_mntfromname,
 756                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 757                   rootvol->ondisk->vol_name);
 758         mp->mnt_stat.f_fsid.val[0] =
 759                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 760         mp->mnt_stat.f_fsid.val[1] =
 761                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 762         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 763
 764         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 765         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 766                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 767
 768         /*
 769          * Certain often-modified fields in the root volume are cached in
 770          * the hammer_mount structure so we do not have to generate lots
 771          * of little UNDO structures for them.
 772          *
 773          * Recopy after recovery.  This also has the side effect of
 774          * setting our cached undo FIFO's first_offset, which serves to
 775          * placemark the FIFO start for the NEXT flush cycle while the
 776          * on-disk first_offset represents the LAST flush cycle.
 777          */
 778         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 779         hmp->flush_tid1 = hmp->next_tid;
 780         hmp->flush_tid2 = hmp->next_tid;
 781         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 782               sizeof(hmp->blockmap));
 783         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 784
 785         hammer_flusher_create(hmp);
 786
 787         /*
 788          * Locate the root directory using the root cluster's B-Tree as a
 789          * starting point.  The root directory uses an obj_id of 1.
 790          *
 791          * FUTURE: Leave the root directory cached referenced but unlocked
 792          * in hmp->rootvp (need to flush it on unmount).
 793          */
 794         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 795         if (error)
 796                 goto done;
 797         vput(rootvp);
 798         /*vn_unlock(hmp->rootvp);*/
 799         if (hmp->ronly == 0)
 800                 error = hammer_recover_stage2(hmp, rootvol);
 801
 802         /*
 803          * If the stage2 recovery fails be sure to clean out all cached
 804          * vnodes before throwing away the mount structure or bad things
 805          * will happen.
 806          */
 807         if (error)
 808                 vflush(mp, 0, 0);
 809
 810 done:
 811         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 812                 /* New mount */
 813
 814                 /* Populate info for mount point (NULL pad)*/
 815                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
 816                 size_t size;
 817                 if (mntpt) {
 818                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
 819                                                         MNAMELEN -1, &size);
 820                 } else { /* Root mount */
 821                         mp->mnt_stat.f_mntonname[0] = '/';
 822                 }
 823         }
 824         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
 825         hammer_rel_volume(rootvol, 0);
 826 failed:
 827         /*
 828          * Cleanup and return.
 829          */
 830         if (error) {
 831                 /* called with fs_token held */
 832                 hammer_free_hmp(mp);
 833         } else {
 834                 lwkt_reltoken(&hmp->fs_token);
 835         }
 836         return (error);
 837 }
 838
 839 static int
 840 hammer_vfs_unmount(struct mount *mp, int mntflags)
 841 {
 842         hammer_mount_t hmp = (void *)mp->mnt_data;
 843         int flags;
 844         int error;
 845
 846         /*
 847          * Clean out the vnodes
 848          */
 849         lwkt_gettoken(&hmp->fs_token);
 850         flags = 0;
 851         if (mntflags & MNT_FORCE)
 852                 flags |= FORCECLOSE;
 853         error = vflush(mp, 0, flags);
 854
 855         /*
 856          * Clean up the internal mount structure and related entities.  This
 857          * may issue I/O.
 858          */
 859         if (error == 0) {
 860                 /* called with fs_token held */
 861                 hammer_free_hmp(mp);
 862         } else {
 863                 lwkt_reltoken(&hmp->fs_token);
 864         }
 865         return(error);
 866 }
 867
 868 /*
 869  * Clean up the internal mount structure and disassociate it from the mount.
 870  * This may issue I/O.
 871  *
 872  * Called with fs_token held.
 873  */
 874 static void
 875 hammer_free_hmp(struct mount *mp)
 876 {
 877         hammer_mount_t hmp = (void *)mp->mnt_data;
 878         hammer_flush_group_t flg;
 879         int count;
 880         int dummy;
 881
 882         /*
 883          * Flush anything dirty.  This won't even run if the
 884          * filesystem errored-out.
 885          */
 886         count = 0;
 887         while (hammer_flusher_haswork(hmp)) {
 888                 hammer_flusher_sync(hmp);
 889                 ++count;
 890                 if (count >= 5) {
 891                         if (count == 5)
 892                                 kprintf("HAMMER: umount flushing.");
 893                         else
 894                                 kprintf(".");
 895                         tsleep(&dummy, 0, "hmrufl", hz);
 896                 }
 897                 if (count == 30) {
 898                         kprintf("giving up\n");
 899                         break;
 900                 }
 901         }
 902         if (count >= 5 && count < 30)
 903                 kprintf("\n");
 904
 905         /*
 906          * If the mount had a critical error we have to destroy any
 907          * remaining inodes before we can finish cleaning up the flusher.
 908          */
 909         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 910                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 911                         hammer_destroy_inode_callback, NULL);
 912         }
 913
 914         /*
 915          * There shouldn't be any inodes left now and any left over
 916          * flush groups should now be empty.
 917          */
 918         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 919         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 920                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 921                 KKASSERT(RB_EMPTY(&flg->flush_tree));
 922                 if (flg->refs) {
 923                         kprintf("HAMMER: Warning, flush_group %p was "
 924                                 "not empty on umount!\n", flg);
 925                 }
 926                 kfree(flg, hmp->m_misc);
 927         }
 928
 929         /*
 930          * We can finally destroy the flusher
 931          */
 932         hammer_flusher_destroy(hmp);
 933
 934         /*
 935          * We may have held recovered buffers due to a read-only mount.
 936          * These must be discarded.
 937          */
 938         if (hmp->ronly)
 939                 hammer_recover_flush_buffers(hmp, NULL, -1);
 940
 941         /*
 942          * Unload buffers and then volumes
 943          */
 944         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 945                 hammer_unload_buffer, NULL);
 946         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 947                 hammer_unload_volume, NULL);
 948
 949         mp->mnt_data = NULL;
 950         mp->mnt_flag &= ~MNT_LOCAL;
 951         hmp->mp = NULL;
 952         hammer_destroy_objid_cache(hmp);
 953         hammer_destroy_dedup_cache(hmp);
 954         if (hmp->dedup_free_cache != NULL) {
 955                 kfree(hmp->dedup_free_cache, hmp->m_misc);
 956                 hmp->dedup_free_cache = NULL;
 957         }
 958         kmalloc_destroy(&hmp->m_misc);
 959         kmalloc_destroy(&hmp->m_inodes);
 960         lwkt_reltoken(&hmp->fs_token);
 961         kfree(hmp, M_HAMMER);
 962 }
 963
 964 /*
 965  * Report critical errors.  ip may be NULL.
 966  */
 967 void
 968 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 969                       int error, const char *msg)
 970 {
 971         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 972
 973         krateprintf(&hmp->krate,
 974                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 975                     hmp->mp->mnt_stat.f_mntfromname,
 976                     (intmax_t)(ip ? ip->obj_id : -1),
 977                     error, msg);
 978
 979         if (hmp->ronly == 0) {
 980                 hmp->ronly = 2;         /* special errored read-only mode */
 981                 hmp->mp->mnt_flag |= MNT_RDONLY;
 982                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 983                         hammer_adjust_volume_mode, NULL);
 984                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 985                         hmp->mp->mnt_stat.f_mntfromname);
 986         }
 987         hmp->error = error;
 988         if (hammer_debug_critical)
 989                 Debugger("Entering debugger");
 990 }
 991
 992
 993 /*
 994  * Obtain a vnode for the specified inode number.  An exclusively locked
 995  * vnode is returned.
 996  */
 997 int
 998 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 999                 ino_t ino, struct vnode **vpp)
1000 {
1001         struct hammer_transaction trans;
1002         struct hammer_mount *hmp = (void *)mp->mnt_data;
1003         struct hammer_inode *ip;
1004         int error;
1005         u_int32_t localization;
1006
1007         lwkt_gettoken(&hmp->fs_token);
1008         hammer_simple_transaction(&trans, hmp);
1009
1010         /*
1011          * If a directory vnode is supplied (mainly NFS) then we can acquire
1012          * the PFS domain from it.  Otherwise we would only be able to vget
1013          * inodes in the root PFS.
1014          */
1015         if (dvp) {
1016                 localization = HAMMER_DEF_LOCALIZATION +
1017                                 VTOI(dvp)->obj_localization;
1018         } else {
1019                 localization = HAMMER_DEF_LOCALIZATION;
1020         }
1021
1022         /*
1023          * Lookup the requested HAMMER inode.  The structure must be
1024          * left unlocked while we manipulate the related vnode to avoid
1025          * a deadlock.
1026          */
1027         ip = hammer_get_inode(&trans, NULL, ino,
1028                               hmp->asof, localization,
1029                               0, &error);
1030         if (ip == NULL) {
1031                 *vpp = NULL;
1032         } else {
1033                 error = hammer_get_vnode(ip, vpp);
1034                 hammer_rel_inode(ip, 0);
1035         }
1036         hammer_done_transaction(&trans);
1037         lwkt_reltoken(&hmp->fs_token);
1038         return (error);
1039 }
1040
1041 /*
1042  * Return the root vnode for the filesystem.
1043  *
1044  * HAMMER stores the root vnode in the hammer_mount structure so
1045  * getting it is easy.
1046  */
1047 static int
1048 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1049 {
1050         int error;
1051
1052         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1053         return (error);
1054 }
1055
1056 static int
1057 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1058 {
1059         struct hammer_mount *hmp = (void *)mp->mnt_data;
1060         hammer_volume_t volume;
1061         hammer_volume_ondisk_t ondisk;
1062         int error;
1063         int64_t bfree;
1064         int64_t breserved;
1065
1066         lwkt_gettoken(&hmp->fs_token);
1067         volume = hammer_get_root_volume(hmp, &error);
1068         if (error) {
1069                 lwkt_reltoken(&hmp->fs_token);
1070                 return(error);
1071         }
1072         ondisk = volume->ondisk;
1073
1074         /*
1075          * Basic stats
1076          */
1077         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1078         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1079         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1080         hammer_rel_volume(volume, 0);
1081
1082         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1083         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1084         if (mp->mnt_stat.f_files < 0)
1085                 mp->mnt_stat.f_files = 0;
1086
1087         *sbp = mp->mnt_stat;
1088         lwkt_reltoken(&hmp->fs_token);
1089         return(0);
1090 }
1091
1092 static int
1093 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1094 {
1095         struct hammer_mount *hmp = (void *)mp->mnt_data;
1096         hammer_volume_t volume;
1097         hammer_volume_ondisk_t ondisk;
1098         int error;
1099         int64_t bfree;
1100         int64_t breserved;
1101
1102         lwkt_gettoken(&hmp->fs_token);
1103         volume = hammer_get_root_volume(hmp, &error);
1104         if (error) {
1105                 lwkt_reltoken(&hmp->fs_token);
1106                 return(error);
1107         }
1108         ondisk = volume->ondisk;
1109
1110         /*
1111          * Basic stats
1112          */
1113         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1114         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1115         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1116         hammer_rel_volume(volume, 0);
1117
1118         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1119         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1120         if (mp->mnt_vstat.f_files < 0)
1121                 mp->mnt_vstat.f_files = 0;
1122         *sbp = mp->mnt_vstat;
1123         lwkt_reltoken(&hmp->fs_token);
1124         return(0);
1125 }
1126
1127 /*
1128  * Sync the filesystem.  Currently we have to run it twice, the second
1129  * one will advance the undo start index to the end index, so if a crash
1130  * occurs no undos will be run on mount.
1131  *
1132  * We do not sync the filesystem if we are called from a panic.  If we did
1133  * we might end up blowing up a sync that was already in progress.
1134  */
1135 static int
1136 hammer_vfs_sync(struct mount *mp, int waitfor)
1137 {
1138         struct hammer_mount *hmp = (void *)mp->mnt_data;
1139         int error;
1140
1141         lwkt_gettoken(&hmp->fs_token);
1142         if (panicstr == NULL) {
1143                 error = hammer_sync_hmp(hmp, waitfor);
1144         } else {
1145                 error = EIO;
1146         }
1147         lwkt_reltoken(&hmp->fs_token);
1148         return (error);
1149 }
1150
1151 /*
1152  * Convert a vnode to a file handle.
1153  *
1154  * Accesses read-only fields on already-referenced structures so
1155  * no token is needed.
1156  */
1157 static int
1158 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1159 {
1160         hammer_inode_t ip;
1161
1162         KKASSERT(MAXFIDSZ >= 16);
1163         ip = VTOI(vp);
1164         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1165         fhp->fid_ext = ip->obj_localization >> 16;
1166         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1167         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1168         return(0);
1169 }
1170
1171
1172 /*
1173  * Convert a file handle back to a vnode.
1174  *
1175  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1176  * null mount.
1177  */
1178 static int
1179 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1180                   struct fid *fhp, struct vnode **vpp)
1181 {
1182         hammer_mount_t hmp = (void *)mp->mnt_data;
1183         struct hammer_transaction trans;
1184         struct hammer_inode *ip;
1185         struct hammer_inode_info info;
1186         int error;
1187         u_int32_t localization;
1188
1189         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1190         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1191         if (rootvp)
1192                 localization = VTOI(rootvp)->obj_localization;
1193         else
1194                 localization = (u_int32_t)fhp->fid_ext << 16;
1195
1196         lwkt_gettoken(&hmp->fs_token);
1197         hammer_simple_transaction(&trans, hmp);
1198
1199         /*
1200          * Get/allocate the hammer_inode structure.  The structure must be
1201          * unlocked while we manipulate the related vnode to avoid a
1202          * deadlock.
1203          */
1204         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1205                               info.obj_asof, localization, 0, &error);
1206         if (ip) {
1207                 error = hammer_get_vnode(ip, vpp);
1208                 hammer_rel_inode(ip, 0);
1209         } else {
1210                 *vpp = NULL;
1211         }
1212         hammer_done_transaction(&trans);
1213         lwkt_reltoken(&hmp->fs_token);
1214         return (error);
1215 }
1216
1217 static int
1218 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1219                     int *exflagsp, struct ucred **credanonp)
1220 {
1221         hammer_mount_t hmp = (void *)mp->mnt_data;
1222         struct netcred *np;
1223         int error;
1224
1225         lwkt_gettoken(&hmp->fs_token);
1226         np = vfs_export_lookup(mp, &hmp->export, nam);
1227         if (np) {
1228                 *exflagsp = np->netc_exflags;
1229                 *credanonp = &np->netc_anon;
1230                 error = 0;
1231         } else {
1232                 error = EACCES;
1233         }
1234         lwkt_reltoken(&hmp->fs_token);
1235         return (error);
1236
1237 }
1238
1239 int
1240 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1241 {
1242         hammer_mount_t hmp = (void *)mp->mnt_data;
1243         int error;
1244
1245         lwkt_gettoken(&hmp->fs_token);
1246
1247         switch(op) {
1248         case MOUNTCTL_SET_EXPORT:
1249                 error = vfs_export(mp, &hmp->export, export);
1250                 break;
1251         default:
1252                 error = EOPNOTSUPP;
1253                 break;
1254         }
1255         lwkt_reltoken(&hmp->fs_token);
1256
1257         return(error);
1258 }
1259