sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42 #include <sys/malloc.h>
  43 #include <sys/nlookup.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/buf.h>
  47 #include <sys/buf2.h>
  48 #include "hammer.h"
  49
  50 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
  51 int hammer_debug_io;
  52 int hammer_debug_general;
  53 int hammer_debug_debug = 1;             /* medium-error panics */
  54 int hammer_debug_inode;
  55 int hammer_debug_locks;
  56 int hammer_debug_btree;
  57 int hammer_debug_tid;
  58 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  59 int hammer_debug_recover_faults;
  60 int hammer_error_panic;                 /* panic on error levels */
  61 int hammer_cluster_enable = 1;          /* enable read clustering by default */
  62 int hammer_count_fsyncs;
  63 int hammer_count_inodes;
  64 int hammer_count_iqueued;
  65 int hammer_count_reclaiming;
  66 int hammer_count_records;
  67 int hammer_count_record_datas;
  68 int hammer_count_volumes;
  69 int hammer_count_buffers;
  70 int hammer_count_nodes;
  71 int64_t hammer_count_extra_space_used;
  72 int64_t hammer_stats_btree_lookups;
  73 int64_t hammer_stats_btree_searches;
  74 int64_t hammer_stats_btree_inserts;
  75 int64_t hammer_stats_btree_deletes;
  76 int64_t hammer_stats_btree_elements;
  77 int64_t hammer_stats_btree_splits;
  78 int64_t hammer_stats_btree_iterations;
  79 int64_t hammer_stats_btree_root_iterations;
  80 int64_t hammer_stats_record_iterations;
  81
  82 int64_t hammer_stats_file_read;
  83 int64_t hammer_stats_file_write;
  84 int64_t hammer_stats_file_iopsr;
  85 int64_t hammer_stats_file_iopsw;
  86 int64_t hammer_stats_disk_read;
  87 int64_t hammer_stats_disk_write;
  88 int64_t hammer_stats_inode_flushes;
  89 int64_t hammer_stats_commits;
  90 int64_t hammer_stats_undo;
  91
  92 int hammer_count_dirtybufspace;         /* global */
  93 int hammer_count_refedbufs;             /* global */
  94 int hammer_count_reservations;
  95 int hammer_count_io_running_read;
  96 int hammer_count_io_running_write;
  97 int hammer_count_io_locked;
  98 int hammer_limit_dirtybufspace;         /* per-mount */
  99 int hammer_limit_recs;                  /* as a whole XXX */
 100 int hammer_limit_inode_recs = 1024;     /* per inode */
 101 int hammer_autoflush = 2000;            /* auto flush */
 102 int hammer_bio_count;
 103 int hammer_verify_zone;
 104 int hammer_verify_data = 1;
 105 int hammer_write_mode;
 106 int hammer_yield_check = 16;
 107 int hammer_fsync_mode;
 108 int64_t hammer_contention_count;
 109 int64_t hammer_zone_limit;
 110
 111 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
 112 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
 113            &hammer_supported_version, 0, "");
 114 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
 115            &hammer_debug_general, 0, "");
 116 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
 117            &hammer_debug_io, 0, "");
 118 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
 119            &hammer_debug_debug, 0, "");
 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 121            &hammer_debug_inode, 0, "");
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 123            &hammer_debug_locks, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 125            &hammer_debug_btree, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 127            &hammer_debug_tid, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 129            &hammer_debug_recover, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 131            &hammer_debug_recover_faults, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, error_panic, CTLFLAG_RW,
 133            &hammer_error_panic, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
 135            &hammer_cluster_enable, 0, "");
 136
 137 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 138            &hammer_limit_dirtybufspace, 0, "");
 139 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 140            &hammer_limit_recs, 0, "");
 141 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
 142            &hammer_limit_inode_recs, 0, "");
 143
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
 145            &hammer_count_fsyncs, 0, "");
 146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 147            &hammer_count_inodes, 0, "");
 148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 149            &hammer_count_iqueued, 0, "");
 150 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 151            &hammer_count_reclaiming, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 153            &hammer_count_records, 0, "");
 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 155            &hammer_count_record_datas, 0, "");
 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 157            &hammer_count_volumes, 0, "");
 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 159            &hammer_count_buffers, 0, "");
 160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 161            &hammer_count_nodes, 0, "");
 162 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 163            &hammer_count_extra_space_used, 0, "");
 164
 165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 166            &hammer_stats_btree_searches, 0, "");
 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 168            &hammer_stats_btree_lookups, 0, "");
 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 170            &hammer_stats_btree_inserts, 0, "");
 171 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 172            &hammer_stats_btree_deletes, 0, "");
 173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 174            &hammer_stats_btree_elements, 0, "");
 175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 176            &hammer_stats_btree_splits, 0, "");
 177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 178            &hammer_stats_btree_iterations, 0, "");
 179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
 180            &hammer_stats_btree_root_iterations, 0, "");
 181 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 182            &hammer_stats_record_iterations, 0, "");
 183
 184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
 185            &hammer_stats_file_read, 0, "");
 186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
 187            &hammer_stats_file_write, 0, "");
 188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
 189            &hammer_stats_file_iopsr, 0, "");
 190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
 191            &hammer_stats_file_iopsw, 0, "");
 192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
 193            &hammer_stats_disk_read, 0, "");
 194 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
 195            &hammer_stats_disk_write, 0, "");
 196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
 197            &hammer_stats_inode_flushes, 0, "");
 198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
 199            &hammer_stats_commits, 0, "");
 200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
 201            &hammer_stats_undo, 0, "");
 202
 203 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 204            &hammer_count_dirtybufspace, 0, "");
 205 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 206            &hammer_count_refedbufs, 0, "");
 207 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 208            &hammer_count_reservations, 0, "");
 209 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 210            &hammer_count_io_running_read, 0, "");
 211 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 212            &hammer_count_io_locked, 0, "");
 213 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 214            &hammer_count_io_running_write, 0, "");
 215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 216            &hammer_zone_limit, 0, "");
 217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 218            &hammer_contention_count, 0, "");
 219 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
 220            &hammer_autoflush, 0, "");
 221 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 222            &hammer_verify_zone, 0, "");
 223 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
 224            &hammer_verify_data, 0, "");
 225 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 226            &hammer_write_mode, 0, "");
 227 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
 228            &hammer_yield_check, 0, "");
 229 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
 230            &hammer_fsync_mode, 0, "");
 231
 232 KTR_INFO_MASTER(hammer);
 233
 234 /*
 235  * VFS ABI
 236  */
 237 static void     hammer_free_hmp(struct mount *mp);
 238
 239 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 240                                 struct ucred *cred);
 241 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 242 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 243 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 244                                 struct ucred *cred);
 245 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 246                                 struct ucred *cred);
 247 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 248 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 249                                 ino_t ino, struct vnode **vpp);
 250 static int      hammer_vfs_init(struct vfsconf *conf);
 251 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 252                                 struct fid *fhp, struct vnode **vpp);
 253 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 254 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 255                                 int *exflagsp, struct ucred **credanonp);
 256
 257
 258 static struct vfsops hammer_vfsops = {
 259         .vfs_mount      = hammer_vfs_mount,
 260         .vfs_unmount    = hammer_vfs_unmount,
 261         .vfs_root       = hammer_vfs_root,
 262         .vfs_statfs     = hammer_vfs_statfs,
 263         .vfs_statvfs    = hammer_vfs_statvfs,
 264         .vfs_sync       = hammer_vfs_sync,
 265         .vfs_vget       = hammer_vfs_vget,
 266         .vfs_init       = hammer_vfs_init,
 267         .vfs_vptofh     = hammer_vfs_vptofh,
 268         .vfs_fhtovp     = hammer_vfs_fhtovp,
 269         .vfs_checkexp   = hammer_vfs_checkexp
 270 };
 271
 272 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
 273
 274 VFS_SET(hammer_vfsops, hammer, 0);
 275 MODULE_VERSION(hammer, 1);
 276
 277 static int
 278 hammer_vfs_init(struct vfsconf *conf)
 279 {
 280         int n;
 281
 282         if (hammer_limit_recs == 0) {
 283                 hammer_limit_recs = nbuf * 25;
 284                 n = kmalloc_limit(M_HAMMER) / 512;
 285                 if (hammer_limit_recs > n)
 286                         hammer_limit_recs = n;
 287         }
 288         if (hammer_limit_dirtybufspace == 0) {
 289                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 290                 if (hammer_limit_dirtybufspace < 100)
 291                         hammer_limit_dirtybufspace = 100;
 292         }
 293         return(0);
 294 }
 295
 296 static int
 297 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 298                  struct ucred *cred)
 299 {
 300         struct hammer_mount_info info;
 301         hammer_mount_t hmp;
 302         hammer_volume_t rootvol;
 303         struct vnode *rootvp;
 304         struct vnode *devvp = NULL;
 305         const char *upath;      /* volume name in userspace */
 306         char *path;             /* volume name in system space */
 307         int error;
 308         int i;
 309         int master_id;
 310         int maxinodes;
 311
 312         /*
 313          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
 314          */
 315         if (mntpt == NULL) {
 316                 if ((error = bdevvp(rootdev, &devvp))) {
 317                         kprintf("hammer_mountroot: can't find devvp\n");
 318                         return (error);
 319                 }
 320                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
 321                 bzero(&info, sizeof(info));
 322                 info.asof = 0;
 323                 info.hflags = 0;
 324                 info.nvolumes = 1;
 325         } else {
 326                 if ((error = copyin(data, &info, sizeof(info))) != 0)
 327                         return (error);
 328         }
 329
 330         /*
 331          * updating or new mount
 332          */
 333         if (mp->mnt_flag & MNT_UPDATE) {
 334                 hmp = (void *)mp->mnt_data;
 335                 KKASSERT(hmp != NULL);
 336         } else {
 337                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 338                         return (EINVAL);
 339                 hmp = NULL;
 340         }
 341
 342         /*
 343          * master-id validation.  The master id may not be changed by a
 344          * mount update.
 345          */
 346         if (info.hflags & HMNT_MASTERID) {
 347                 if (hmp && hmp->master_id != info.master_id) {
 348                         kprintf("hammer: cannot change master id "
 349                                 "with mount update\n");
 350                         return(EINVAL);
 351                 }
 352                 master_id = info.master_id;
 353                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
 354                         return (EINVAL);
 355         } else {
 356                 if (hmp)
 357                         master_id = hmp->master_id;
 358                 else
 359                         master_id = 0;
 360         }
 361
 362         /*
 363          * Interal mount data structure
 364          */
 365         if (hmp == NULL) {
 366                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 367                 mp->mnt_data = (qaddr_t)hmp;
 368                 hmp->mp = mp;
 369                 /*TAILQ_INIT(&hmp->recycle_list);*/
 370
 371                 /*
 372                  * Make sure kmalloc type limits are set appropriately.  If root
 373                  * increases the vnode limit you may have to do a dummy remount
 374                  * to adjust the HAMMER inode limit.
 375                  */
 376                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
 377                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
 378
 379                 maxinodes = desiredvnodes + desiredvnodes / 5 +
 380                             HAMMER_RECLAIM_WAIT;
 381                 kmalloc_raise_limit(hmp->m_inodes,
 382                                     maxinodes * sizeof(struct hammer_inode));
 383
 384                 hmp->root_btree_beg.localization = 0x00000000U;
 385                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 386                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 387                 hmp->root_btree_beg.create_tid = 1;
 388                 hmp->root_btree_beg.delete_tid = 1;
 389                 hmp->root_btree_beg.rec_type = 0;
 390                 hmp->root_btree_beg.obj_type = 0;
 391
 392                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 393                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 394                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 395                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 396                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 397                 hmp->root_btree_end.rec_type = 0xFFFFU;
 398                 hmp->root_btree_end.obj_type = 0;
 399
 400                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
 401                 hmp->krate.count = -16; /* initial burst */
 402
 403                 hmp->sync_lock.refs = 1;
 404                 hmp->free_lock.refs = 1;
 405                 hmp->undo_lock.refs = 1;
 406                 hmp->blkmap_lock.refs = 1;
 407                 hmp->snapshot_lock.refs = 1;
 408
 409                 TAILQ_INIT(&hmp->delay_list);
 410                 TAILQ_INIT(&hmp->flush_group_list);
 411                 TAILQ_INIT(&hmp->objid_cache_list);
 412                 TAILQ_INIT(&hmp->undo_lru_list);
 413                 TAILQ_INIT(&hmp->reclaim_list);
 414         }
 415         hmp->hflags &= ~HMNT_USERFLAGS;
 416         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 417
 418         hmp->master_id = master_id;
 419
 420         if (info.asof) {
 421                 mp->mnt_flag |= MNT_RDONLY;
 422                 hmp->asof = info.asof;
 423         } else {
 424                 hmp->asof = HAMMER_MAX_TID;
 425         }
 426
 427         /*
 428          * Re-open read-write if originally read-only, or vise-versa.
 429          *
 430          * When going from read-only to read-write execute the stage2
 431          * recovery if it has not already been run.
 432          */
 433         if (mp->mnt_flag & MNT_UPDATE) {
 434                 error = 0;
 435                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 436                         kprintf("HAMMER read-only -> read-write\n");
 437                         hmp->ronly = 0;
 438                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 439                                 hammer_adjust_volume_mode, NULL);
 440                         rootvol = hammer_get_root_volume(hmp, &error);
 441                         if (rootvol) {
 442                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 443                                 error = hammer_recover_stage2(hmp, rootvol);
 444                                 bcopy(rootvol->ondisk->vol0_blockmap,
 445                                       hmp->blockmap,
 446                                       sizeof(hmp->blockmap));
 447                                 hammer_rel_volume(rootvol, 0);
 448                         }
 449                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 450                                 hammer_reload_inode, NULL);
 451                         /* kernel clears MNT_RDONLY */
 452                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 453                         kprintf("HAMMER read-write -> read-only\n");
 454                         hmp->ronly = 1; /* messy */
 455                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 456                                 hammer_reload_inode, NULL);
 457                         hmp->ronly = 0;
 458                         hammer_flusher_sync(hmp);
 459                         hammer_flusher_sync(hmp);
 460                         hammer_flusher_sync(hmp);
 461                         hmp->ronly = 1;
 462                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 463                                 hammer_adjust_volume_mode, NULL);
 464                 }
 465                 return(error);
 466         }
 467
 468         RB_INIT(&hmp->rb_vols_root);
 469         RB_INIT(&hmp->rb_inos_root);
 470         RB_INIT(&hmp->rb_nods_root);
 471         RB_INIT(&hmp->rb_undo_root);
 472         RB_INIT(&hmp->rb_resv_root);
 473         RB_INIT(&hmp->rb_bufs_root);
 474         RB_INIT(&hmp->rb_pfsm_root);
 475
 476         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 477
 478         TAILQ_INIT(&hmp->volu_list);
 479         TAILQ_INIT(&hmp->undo_list);
 480         TAILQ_INIT(&hmp->data_list);
 481         TAILQ_INIT(&hmp->meta_list);
 482         TAILQ_INIT(&hmp->lose_list);
 483
 484         /*
 485          * Load volumes
 486          */
 487         path = objcache_get(namei_oc, M_WAITOK);
 488         hmp->nvolumes = -1;
 489         for (i = 0; i < info.nvolumes; ++i) {
 490                 if (mntpt == NULL) {
 491                         /*
 492                          * Root mount.
 493                          * Only one volume; and no need for copyin.
 494                          */
 495                         KKASSERT(info.nvolumes == 1);
 496                         ksnprintf(path, MAXPATHLEN, "/dev/%s",
 497                                   mp->mnt_stat.f_mntfromname);
 498                         error = 0;
 499                 } else {
 500                         error = copyin(&info.volumes[i], &upath,
 501                                        sizeof(char *));
 502                         if (error == 0)
 503                                 error = copyinstr(upath, path,
 504                                                   MAXPATHLEN, NULL);
 505                 }
 506                 if (error == 0)
 507                         error = hammer_install_volume(hmp, path, devvp);
 508                 if (error)
 509                         break;
 510         }
 511         objcache_put(namei_oc, path);
 512
 513         /*
 514          * Make sure we found a root volume
 515          */
 516         if (error == 0 && hmp->rootvol == NULL) {
 517                 kprintf("hammer_mount: No root volume found!\n");
 518                 error = EINVAL;
 519         }
 520
 521         /*
 522          * Check that all required volumes are available
 523          */
 524         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
 525                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
 526                 error = EINVAL;
 527         }
 528
 529         if (error) {
 530                 hammer_free_hmp(mp);
 531                 return (error);
 532         }
 533
 534         /*
 535          * No errors, setup enough of the mount point so we can lookup the
 536          * root vnode.
 537          */
 538         mp->mnt_iosize_max = MAXPHYS;
 539         mp->mnt_kern_flag |= MNTK_FSMID;
 540
 541         /*
 542          * note: f_iosize is used by vnode_pager_haspage() when constructing
 543          * its VOP_BMAP call.
 544          */
 545         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 546         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 547
 548         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 549         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 550
 551         mp->mnt_maxsymlinklen = 255;
 552         mp->mnt_flag |= MNT_LOCAL;
 553
 554         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 555         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 556         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 557
 558         /*
 559          * The root volume's ondisk pointer is only valid if we hold a
 560          * reference to it.
 561          */
 562         rootvol = hammer_get_root_volume(hmp, &error);
 563         if (error)
 564                 goto failed;
 565
 566         /*
 567          * Perform any necessary UNDO operations.  The recovery code does
 568          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 569          * and then re-copy it again after recovery is complete.
 570          *
 571          * If this is a read-only mount the UNDO information is retained
 572          * in memory in the form of dirty buffer cache buffers, and not
 573          * written back to the media.
 574          */
 575         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 576               sizeof(hmp->blockmap));
 577
 578         /*
 579          * Check filesystem version
 580          */
 581         hmp->version = rootvol->ondisk->vol_version;
 582         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
 583             hmp->version > HAMMER_VOL_VERSION_MAX) {
 584                 kprintf("HAMMER: mount unsupported fs version %d\n",
 585                         hmp->version);
 586                 error = ERANGE;
 587                 goto done;
 588         }
 589
 590         /*
 591          * The undo_rec_limit limits the size of flush groups to avoid
 592          * blowing out the UNDO FIFO.  This calculation is typically in
 593          * the tens of thousands and is designed primarily when small
 594          * HAMMER filesystems are created.
 595          */
 596         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
 597         if (hammer_debug_general & 0x0001)
 598                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
 599
 600         /*
 601          * NOTE: Recover stage1 not only handles meta-data recovery, it
 602          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
 603          */
 604         error = hammer_recover_stage1(hmp, rootvol);
 605         if (error) {
 606                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 607                 goto done;
 608         }
 609
 610         /*
 611          * Finish setup now that we have a good root volume.
 612          *
 613          * The top 16 bits of fsid.val[1] is a pfs id.
 614          */
 615         ksnprintf(mp->mnt_stat.f_mntfromname,
 616                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 617                   rootvol->ondisk->vol_name);
 618         mp->mnt_stat.f_fsid.val[0] =
 619                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 620         mp->mnt_stat.f_fsid.val[1] =
 621                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 622         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 623
 624         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 625         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 626                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 627
 628         /*
 629          * Certain often-modified fields in the root volume are cached in
 630          * the hammer_mount structure so we do not have to generate lots
 631          * of little UNDO structures for them.
 632          *
 633          * Recopy after recovery.  This also has the side effect of
 634          * setting our cached undo FIFO's first_offset, which serves to
 635          * placemark the FIFO start for the NEXT flush cycle while the
 636          * on-disk first_offset represents the LAST flush cycle.
 637          */
 638         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 639         hmp->flush_tid1 = hmp->next_tid;
 640         hmp->flush_tid2 = hmp->next_tid;
 641         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 642               sizeof(hmp->blockmap));
 643         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 644
 645         hammer_flusher_create(hmp);
 646
 647         /*
 648          * Locate the root directory using the root cluster's B-Tree as a
 649          * starting point.  The root directory uses an obj_id of 1.
 650          *
 651          * FUTURE: Leave the root directory cached referenced but unlocked
 652          * in hmp->rootvp (need to flush it on unmount).
 653          */
 654         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
 655         if (error)
 656                 goto done;
 657         vput(rootvp);
 658         /*vn_unlock(hmp->rootvp);*/
 659         error = hammer_recover_stage2(hmp, rootvol);
 660
 661 done:
 662         hammer_rel_volume(rootvol, 0);
 663 failed:
 664         /*
 665          * Cleanup and return.
 666          */
 667         if (error)
 668                 hammer_free_hmp(mp);
 669         return (error);
 670 }
 671
 672 static int
 673 hammer_vfs_unmount(struct mount *mp, int mntflags)
 674 {
 675 #if 0
 676         struct hammer_mount *hmp = (void *)mp->mnt_data;
 677 #endif
 678         int flags;
 679         int error;
 680
 681         /*
 682          * Clean out the vnodes
 683          */
 684         flags = 0;
 685         if (mntflags & MNT_FORCE)
 686                 flags |= FORCECLOSE;
 687         if ((error = vflush(mp, 0, flags)) != 0)
 688                 return (error);
 689
 690         /*
 691          * Clean up the internal mount structure and related entities.  This
 692          * may issue I/O.
 693          */
 694         hammer_free_hmp(mp);
 695         return(0);
 696 }
 697
 698 /*
 699  * Clean up the internal mount structure and disassociate it from the mount.
 700  * This may issue I/O.
 701  */
 702 static void
 703 hammer_free_hmp(struct mount *mp)
 704 {
 705         struct hammer_mount *hmp = (void *)mp->mnt_data;
 706         hammer_flush_group_t flg;
 707         int count;
 708         int dummy;
 709
 710         /*
 711          * Flush anything dirty.  This won't even run if the
 712          * filesystem errored-out.
 713          */
 714         count = 0;
 715         while (hammer_flusher_haswork(hmp)) {
 716                 hammer_flusher_sync(hmp);
 717                 ++count;
 718                 if (count >= 5) {
 719                         if (count == 5)
 720                                 kprintf("HAMMER: umount flushing.");
 721                         else
 722                                 kprintf(".");
 723                         tsleep(&dummy, 0, "hmrufl", hz);
 724                 }
 725                 if (count == 30) {
 726                         kprintf("giving up\n");
 727                         break;
 728                 }
 729         }
 730         if (count >= 5 && count < 30)
 731                 kprintf("\n");
 732
 733         /*
 734          * If the mount had a critical error we have to destroy any
 735          * remaining inodes before we can finish cleaning up the flusher.
 736          */
 737         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
 738                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 739                         hammer_destroy_inode_callback, NULL);
 740         }
 741
 742         /*
 743          * There shouldn't be any inodes left now and any left over
 744          * flush groups should now be empty.
 745          */
 746         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 747         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
 748                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
 749                 KKASSERT(TAILQ_EMPTY(&flg->flush_list));
 750                 if (flg->refs) {
 751                         kprintf("HAMMER: Warning, flush_group %p was "
 752                                 "not empty on umount!\n", flg);
 753                 }
 754                 kfree(flg, hmp->m_misc);
 755         }
 756
 757         /*
 758          * We can finally destroy the flusher
 759          */
 760         hammer_flusher_destroy(hmp);
 761
 762         /*
 763          * We may have held recovered buffers due to a read-only mount.
 764          * These must be discarded.
 765          */
 766         if (hmp->ronly)
 767                 hammer_recover_flush_buffers(hmp, NULL, -1);
 768
 769         /*
 770          * Unload buffers and then volumes
 771          */
 772         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 773                 hammer_unload_buffer, NULL);
 774         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 775                 hammer_unload_volume, NULL);
 776
 777         mp->mnt_data = NULL;
 778         mp->mnt_flag &= ~MNT_LOCAL;
 779         hmp->mp = NULL;
 780         hammer_destroy_objid_cache(hmp);
 781         kmalloc_destroy(&hmp->m_misc);
 782         kmalloc_destroy(&hmp->m_inodes);
 783         kfree(hmp, M_HAMMER);
 784 }
 785
 786 /*
 787  * Report critical errors.  ip may be NULL.
 788  */
 789 void
 790 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
 791                       int error, const char *msg)
 792 {
 793         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
 794
 795         krateprintf(&hmp->krate,
 796                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
 797                     hmp->mp->mnt_stat.f_mntfromname,
 798                     (intmax_t)(ip ? ip->obj_id : -1),
 799                     error, msg);
 800
 801         if (hmp->ronly == 0) {
 802                 hmp->ronly = 2;         /* special errored read-only mode */
 803                 hmp->mp->mnt_flag |= MNT_RDONLY;
 804                 kprintf("HAMMER(%s): Forcing read-only mode\n",
 805                         hmp->mp->mnt_stat.f_mntfromname);
 806         }
 807         hmp->error = error;
 808         if (hammer_error_panic > 2)
 809                 Debugger("Entering debugger");
 810 }
 811
 812
 813 /*
 814  * Obtain a vnode for the specified inode number.  An exclusively locked
 815  * vnode is returned.
 816  */
 817 int
 818 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
 819                 ino_t ino, struct vnode **vpp)
 820 {
 821         struct hammer_transaction trans;
 822         struct hammer_mount *hmp = (void *)mp->mnt_data;
 823         struct hammer_inode *ip;
 824         int error;
 825         u_int32_t localization;
 826
 827         hammer_simple_transaction(&trans, hmp);
 828
 829         /*
 830          * If a directory vnode is supplied (mainly NFS) then we can acquire
 831          * the PFS domain from it.  Otherwise we would only be able to vget
 832          * inodes in the root PFS.
 833          */
 834         if (dvp) {
 835                 localization = HAMMER_DEF_LOCALIZATION +
 836                                 VTOI(dvp)->obj_localization;
 837         } else {
 838                 localization = HAMMER_DEF_LOCALIZATION;
 839         }
 840
 841         /*
 842          * Lookup the requested HAMMER inode.  The structure must be
 843          * left unlocked while we manipulate the related vnode to avoid
 844          * a deadlock.
 845          */
 846         ip = hammer_get_inode(&trans, NULL, ino,
 847                               hmp->asof, localization,
 848                               0, &error);
 849         if (ip == NULL) {
 850                 *vpp = NULL;
 851                 hammer_done_transaction(&trans);
 852                 return(error);
 853         }
 854         error = hammer_get_vnode(ip, vpp);
 855         hammer_rel_inode(ip, 0);
 856         hammer_done_transaction(&trans);
 857         return (error);
 858 }
 859
 860 /*
 861  * Return the root vnode for the filesystem.
 862  *
 863  * HAMMER stores the root vnode in the hammer_mount structure so
 864  * getting it is easy.
 865  */
 866 static int
 867 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 868 {
 869 #if 0
 870         struct hammer_mount *hmp = (void *)mp->mnt_data;
 871 #endif
 872         int error;
 873
 874         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 875         return (error);
 876 }
 877
 878 static int
 879 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 880 {
 881         struct hammer_mount *hmp = (void *)mp->mnt_data;
 882         hammer_volume_t volume;
 883         hammer_volume_ondisk_t ondisk;
 884         int error;
 885         int64_t bfree;
 886         int64_t breserved;
 887
 888         volume = hammer_get_root_volume(hmp, &error);
 889         if (error)
 890                 return(error);
 891         ondisk = volume->ondisk;
 892
 893         /*
 894          * Basic stats
 895          */
 896         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 897         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 898         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 899         hammer_rel_volume(volume, 0);
 900
 901         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 902         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 903         if (mp->mnt_stat.f_files < 0)
 904                 mp->mnt_stat.f_files = 0;
 905
 906         *sbp = mp->mnt_stat;
 907         return(0);
 908 }
 909
 910 static int
 911 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 912 {
 913         struct hammer_mount *hmp = (void *)mp->mnt_data;
 914         hammer_volume_t volume;
 915         hammer_volume_ondisk_t ondisk;
 916         int error;
 917         int64_t bfree;
 918         int64_t breserved;
 919
 920         volume = hammer_get_root_volume(hmp, &error);
 921         if (error)
 922                 return(error);
 923         ondisk = volume->ondisk;
 924
 925         /*
 926          * Basic stats
 927          */
 928         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 929         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 930         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 931         hammer_rel_volume(volume, 0);
 932
 933         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 934         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 935         if (mp->mnt_vstat.f_files < 0)
 936                 mp->mnt_vstat.f_files = 0;
 937         *sbp = mp->mnt_vstat;
 938         return(0);
 939 }
 940
 941 /*
 942  * Sync the filesystem.  Currently we have to run it twice, the second
 943  * one will advance the undo start index to the end index, so if a crash
 944  * occurs no undos will be run on mount.
 945  *
 946  * We do not sync the filesystem if we are called from a panic.  If we did
 947  * we might end up blowing up a sync that was already in progress.
 948  */
 949 static int
 950 hammer_vfs_sync(struct mount *mp, int waitfor)
 951 {
 952         struct hammer_mount *hmp = (void *)mp->mnt_data;
 953         int error;
 954
 955         if (panicstr == NULL) {
 956                 error = hammer_sync_hmp(hmp, waitfor);
 957         } else {
 958                 error = EIO;
 959         }
 960         return (error);
 961 }
 962
 963 /*
 964  * Convert a vnode to a file handle.
 965  */
 966 static int
 967 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 968 {
 969         hammer_inode_t ip;
 970
 971         KKASSERT(MAXFIDSZ >= 16);
 972         ip = VTOI(vp);
 973         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 974         fhp->fid_ext = ip->obj_localization >> 16;
 975         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 976         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 977         return(0);
 978 }
 979
 980
 981 /*
 982  * Convert a file handle back to a vnode.
 983  *
 984  * Use rootvp to enforce PFS isolation when a PFS is exported via a
 985  * null mount.
 986  */
 987 static int
 988 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 989                   struct fid *fhp, struct vnode **vpp)
 990 {
 991         struct hammer_transaction trans;
 992         struct hammer_inode *ip;
 993         struct hammer_inode_info info;
 994         int error;
 995         u_int32_t localization;
 996
 997         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 998         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 999         if (rootvp)
1000                 localization = VTOI(rootvp)->obj_localization;
1001         else
1002                 localization = (u_int32_t)fhp->fid_ext << 16;
1003
1004         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1005
1006         /*
1007          * Get/allocate the hammer_inode structure.  The structure must be
1008          * unlocked while we manipulate the related vnode to avoid a
1009          * deadlock.
1010          */
1011         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1012                               info.obj_asof, localization, 0, &error);
1013         if (ip == NULL) {
1014                 *vpp = NULL;
1015                 return(error);
1016         }
1017         error = hammer_get_vnode(ip, vpp);
1018         hammer_rel_inode(ip, 0);
1019         hammer_done_transaction(&trans);
1020         return (error);
1021 }
1022
1023 static int
1024 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1025                     int *exflagsp, struct ucred **credanonp)
1026 {
1027         hammer_mount_t hmp = (void *)mp->mnt_data;
1028         struct netcred *np;
1029         int error;
1030
1031         np = vfs_export_lookup(mp, &hmp->export, nam);
1032         if (np) {
1033                 *exflagsp = np->netc_exflags;
1034                 *credanonp = &np->netc_anon;
1035                 error = 0;
1036         } else {
1037                 error = EACCES;
1038         }
1039         return (error);
1040
1041 }
1042
1043 int
1044 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1045 {
1046         hammer_mount_t hmp = (void *)mp->mnt_data;
1047         int error;
1048
1049         switch(op) {
1050         case MOUNTCTL_SET_EXPORT:
1051                 error = vfs_export(mp, &hmp->export, export);
1052                 break;
1053         default:
1054                 error = EOPNOTSUPP;
1055                 break;
1056         }
1057         return(error);
1058 }
1059