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 1.60 2008/07/07 00:24:31 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_debug_io;
  51 int hammer_debug_general;
  52 int hammer_debug_debug;
  53 int hammer_debug_inode;
  54 int hammer_debug_locks;
  55 int hammer_debug_btree;
  56 int hammer_debug_tid;
  57 int hammer_debug_recover;               /* -1 will disable, +1 will force */
  58 int hammer_debug_recover_faults;
  59 int hammer_debug_cluster_enable = 1;    /* enable read clustering by default */
  60 int hammer_count_inodes;
  61 int hammer_count_iqueued;
  62 int hammer_count_reclaiming;
  63 int hammer_count_records;
  64 int hammer_count_record_datas;
  65 int hammer_count_volumes;
  66 int hammer_count_buffers;
  67 int hammer_count_nodes;
  68 int64_t hammer_count_extra_space_used;
  69 int64_t hammer_stats_btree_lookups;
  70 int64_t hammer_stats_btree_searches;
  71 int64_t hammer_stats_btree_inserts;
  72 int64_t hammer_stats_btree_deletes;
  73 int64_t hammer_stats_btree_elements;
  74 int64_t hammer_stats_btree_splits;
  75 int64_t hammer_stats_btree_iterations;
  76 int64_t hammer_stats_record_iterations;
  77 int hammer_count_dirtybufspace;         /* global */
  78 int hammer_count_refedbufs;             /* global */
  79 int hammer_count_reservations;
  80 int hammer_count_io_running_read;
  81 int hammer_count_io_running_write;
  82 int hammer_count_io_locked;
  83 int hammer_limit_dirtybufspace;         /* per-mount */
  84 int hammer_limit_recs;                  /* as a whole XXX */
  85 int hammer_limit_iqueued;               /* per-mount */
  86 int hammer_bio_count;
  87 int hammer_verify_zone;
  88 int hammer_write_mode;
  89 int64_t hammer_contention_count;
  90 int64_t hammer_zone_limit;
  91
  92 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
  93 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
  94            &hammer_debug_general, 0, "");
  95 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
  96            &hammer_debug_io, 0, "");
  97 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
  98            &hammer_debug_debug, 0, "");
  99 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
 100            &hammer_debug_inode, 0, "");
 101 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 102            &hammer_debug_locks, 0, "");
 103 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 104            &hammer_debug_btree, 0, "");
 105 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 106            &hammer_debug_tid, 0, "");
 107 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 108            &hammer_debug_recover, 0, "");
 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 110            &hammer_debug_recover_faults, 0, "");
 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_cluster_enable, CTLFLAG_RW,
 112            &hammer_debug_cluster_enable, 0, "");
 113
 114 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 115            &hammer_limit_dirtybufspace, 0, "");
 116 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 117            &hammer_limit_recs, 0, "");
 118 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_iqueued, CTLFLAG_RW,
 119            &hammer_limit_iqueued, 0, "");
 120
 121 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 122            &hammer_count_inodes, 0, "");
 123 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 124            &hammer_count_iqueued, 0, "");
 125 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 126            &hammer_count_reclaiming, 0, "");
 127 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 128            &hammer_count_records, 0, "");
 129 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 130            &hammer_count_record_datas, 0, "");
 131 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 132            &hammer_count_volumes, 0, "");
 133 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 134            &hammer_count_buffers, 0, "");
 135 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 136            &hammer_count_nodes, 0, "");
 137 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
 138            &hammer_count_extra_space_used, 0, "");
 139 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 140            &hammer_stats_btree_searches, 0, "");
 141 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 142            &hammer_stats_btree_lookups, 0, "");
 143 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 144            &hammer_stats_btree_inserts, 0, "");
 145 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 146            &hammer_stats_btree_deletes, 0, "");
 147 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 148            &hammer_stats_btree_elements, 0, "");
 149 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 150            &hammer_stats_btree_splits, 0, "");
 151 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 152            &hammer_stats_btree_iterations, 0, "");
 153 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 154            &hammer_stats_record_iterations, 0, "");
 155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 156            &hammer_count_dirtybufspace, 0, "");
 157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 158            &hammer_count_refedbufs, 0, "");
 159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 160            &hammer_count_reservations, 0, "");
 161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 162            &hammer_count_io_running_read, 0, "");
 163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 164            &hammer_count_io_locked, 0, "");
 165 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 166            &hammer_count_io_running_write, 0, "");
 167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 168            &hammer_zone_limit, 0, "");
 169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 170            &hammer_contention_count, 0, "");
 171 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 172            &hammer_verify_zone, 0, "");
 173 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 174            &hammer_write_mode, 0, "");
 175
 176 KTR_INFO_MASTER(hammer);
 177
 178 /*
 179  * VFS ABI
 180  */
 181 static void     hammer_free_hmp(struct mount *mp);
 182
 183 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 184                                 struct ucred *cred);
 185 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 186 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 187 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 188                                 struct ucred *cred);
 189 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 190                                 struct ucred *cred);
 191 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 192 static int      hammer_vfs_vget(struct mount *mp, ino_t ino,
 193                                 struct vnode **vpp);
 194 static int      hammer_vfs_init(struct vfsconf *conf);
 195 static int      hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp,
 196                                 struct vnode **vpp);
 197 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 198 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 199                                 int *exflagsp, struct ucred **credanonp);
 200
 201
 202 static struct vfsops hammer_vfsops = {
 203         .vfs_mount      = hammer_vfs_mount,
 204         .vfs_unmount    = hammer_vfs_unmount,
 205         .vfs_root       = hammer_vfs_root,
 206         .vfs_statfs     = hammer_vfs_statfs,
 207         .vfs_statvfs    = hammer_vfs_statvfs,
 208         .vfs_sync       = hammer_vfs_sync,
 209         .vfs_vget       = hammer_vfs_vget,
 210         .vfs_init       = hammer_vfs_init,
 211         .vfs_vptofh     = hammer_vfs_vptofh,
 212         .vfs_fhtovp     = hammer_vfs_fhtovp,
 213         .vfs_checkexp   = hammer_vfs_checkexp
 214 };
 215
 216 MALLOC_DEFINE(M_HAMMER, "hammer-mount", "hammer mount");
 217
 218 VFS_SET(hammer_vfsops, hammer, 0);
 219 MODULE_VERSION(hammer, 1);
 220
 221 static int
 222 hammer_vfs_init(struct vfsconf *conf)
 223 {
 224         int n;
 225
 226         if (hammer_limit_recs == 0) {
 227                 hammer_limit_recs = nbuf * 25;
 228                 n = kmalloc_limit(M_HAMMER) / 512;
 229                 if (hammer_limit_recs > n)
 230                         hammer_limit_recs = n;
 231         }
 232         if (hammer_limit_dirtybufspace == 0) {
 233                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 234                 if (hammer_limit_dirtybufspace < 100)
 235                         hammer_limit_dirtybufspace = 100;
 236         }
 237         if (hammer_limit_iqueued == 0)
 238                 hammer_limit_iqueued = desiredvnodes / 5;
 239         return(0);
 240 }
 241
 242 static int
 243 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 244                  struct ucred *cred)
 245 {
 246         struct hammer_mount_info info;
 247         hammer_mount_t hmp;
 248         hammer_volume_t rootvol;
 249         struct vnode *rootvp;
 250         const char *upath;      /* volume name in userspace */
 251         char *path;             /* volume name in system space */
 252         int error;
 253         int i;
 254
 255         if ((error = copyin(data, &info, sizeof(info))) != 0)
 256                 return (error);
 257         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 258                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 259                         return (EINVAL);
 260         }
 261         if ((info.hflags & HMNT_MASTERID) &&
 262             (info.masterid < -1 || info.masterid >= HAMMER_MAX_MASTERS)) {
 263                         return (EINVAL);
 264         }
 265
 266         /*
 267          * Interal mount data structure
 268          */
 269         if (mp->mnt_flag & MNT_UPDATE) {
 270                 hmp = (void *)mp->mnt_data;
 271                 KKASSERT(hmp != NULL);
 272         } else {
 273                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 274                 mp->mnt_data = (qaddr_t)hmp;
 275                 hmp->mp = mp;
 276                 hmp->namekey_iterator = mycpu->gd_time_seconds;
 277                 /*TAILQ_INIT(&hmp->recycle_list);*/
 278
 279                 hmp->root_btree_beg.localization = 0x00000000U;
 280                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 281                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 282                 hmp->root_btree_beg.create_tid = 1;
 283                 hmp->root_btree_beg.delete_tid = 1;
 284                 hmp->root_btree_beg.rec_type = 0;
 285                 hmp->root_btree_beg.obj_type = 0;
 286
 287                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 288                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 289                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 290                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 291                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 292                 hmp->root_btree_end.rec_type = 0xFFFFU;
 293                 hmp->root_btree_end.obj_type = 0;
 294
 295                 hmp->sync_lock.refs = 1;
 296                 hmp->free_lock.refs = 1;
 297                 hmp->undo_lock.refs = 1;
 298                 hmp->blkmap_lock.refs = 1;
 299
 300                 TAILQ_INIT(&hmp->flush_list);
 301                 TAILQ_INIT(&hmp->delay_list);
 302                 TAILQ_INIT(&hmp->objid_cache_list);
 303                 TAILQ_INIT(&hmp->undo_lru_list);
 304                 TAILQ_INIT(&hmp->reclaim_list);
 305         }
 306         hmp->hflags &= ~HMNT_USERFLAGS;
 307         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 308         if (info.hflags & HMNT_MASTERID)
 309                 hmp->masterid = info.masterid;
 310         else
 311                 hmp->masterid = -1;
 312         if (info.asof) {
 313                 kprintf("ASOF\n");
 314                 mp->mnt_flag |= MNT_RDONLY;
 315                 hmp->asof = info.asof;
 316         } else {
 317                 hmp->asof = HAMMER_MAX_TID;
 318         }
 319
 320         /*
 321          * Re-open read-write if originally read-only, or vise-versa.
 322          */
 323         if (mp->mnt_flag & MNT_UPDATE) {
 324                 error = 0;
 325                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 326                         kprintf("HAMMER read-only -> read-write\n");
 327                         hmp->ronly = 0;
 328                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 329                                 hammer_adjust_volume_mode, NULL);
 330                         rootvol = hammer_get_root_volume(hmp, &error);
 331                         if (rootvol) {
 332                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 333                                 bcopy(rootvol->ondisk->vol0_blockmap,
 334                                       hmp->blockmap,
 335                                       sizeof(hmp->blockmap));
 336                                 hammer_rel_volume(rootvol, 0);
 337                         }
 338                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 339                                 hammer_reload_inode, NULL);
 340                         /* kernel clears MNT_RDONLY */
 341                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 342                         kprintf("HAMMER read-write -> read-only\n");
 343                         hmp->ronly = 1; /* messy */
 344                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 345                                 hammer_reload_inode, NULL);
 346                         hmp->ronly = 0;
 347                         hammer_flusher_sync(hmp);
 348                         hammer_flusher_sync(hmp);
 349                         hammer_flusher_sync(hmp);
 350                         hmp->ronly = 1;
 351                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 352                                 hammer_adjust_volume_mode, NULL);
 353                 }
 354                 return(error);
 355         }
 356
 357         RB_INIT(&hmp->rb_vols_root);
 358         RB_INIT(&hmp->rb_inos_root);
 359         RB_INIT(&hmp->rb_nods_root);
 360         RB_INIT(&hmp->rb_undo_root);
 361         RB_INIT(&hmp->rb_resv_root);
 362         RB_INIT(&hmp->rb_bufs_root);
 363         RB_INIT(&hmp->rb_pfsm_root);
 364
 365         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 366
 367         TAILQ_INIT(&hmp->volu_list);
 368         TAILQ_INIT(&hmp->undo_list);
 369         TAILQ_INIT(&hmp->data_list);
 370         TAILQ_INIT(&hmp->meta_list);
 371         TAILQ_INIT(&hmp->lose_list);
 372
 373         /*
 374          * Load volumes
 375          */
 376         path = objcache_get(namei_oc, M_WAITOK);
 377         hmp->nvolumes = info.nvolumes;
 378         for (i = 0; i < info.nvolumes; ++i) {
 379                 error = copyin(&info.volumes[i], &upath, sizeof(char *));
 380                 if (error == 0)
 381                         error = copyinstr(upath, path, MAXPATHLEN, NULL);
 382                 if (error == 0)
 383                         error = hammer_install_volume(hmp, path);
 384                 if (error)
 385                         break;
 386         }
 387         objcache_put(namei_oc, path);
 388
 389         /*
 390          * Make sure we found a root volume
 391          */
 392         if (error == 0 && hmp->rootvol == NULL) {
 393                 kprintf("hammer_mount: No root volume found!\n");
 394                 error = EINVAL;
 395         }
 396         if (error) {
 397                 hammer_free_hmp(mp);
 398                 return (error);
 399         }
 400
 401         /*
 402          * No errors, setup enough of the mount point so we can lookup the
 403          * root vnode.
 404          */
 405         mp->mnt_iosize_max = MAXPHYS;
 406         mp->mnt_kern_flag |= MNTK_FSMID;
 407
 408         /*
 409          * note: f_iosize is used by vnode_pager_haspage() when constructing
 410          * its VOP_BMAP call.
 411          */
 412         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 413         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 414
 415         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 416         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 417
 418         mp->mnt_maxsymlinklen = 255;
 419         mp->mnt_flag |= MNT_LOCAL;
 420
 421         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 422         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 423         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 424
 425         /*
 426          * The root volume's ondisk pointer is only valid if we hold a
 427          * reference to it.
 428          */
 429         rootvol = hammer_get_root_volume(hmp, &error);
 430         if (error)
 431                 goto failed;
 432
 433         /*
 434          * Perform any necessary UNDO operations.  The recovery code does
 435          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 436          * and then re-copy it again after recovery is complete.
 437          *
 438          * If this is a read-only mount the UNDO information is retained
 439          * in memory in the form of dirty buffer cache buffers, and not
 440          * written back to the media.
 441          */
 442         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 443               sizeof(hmp->blockmap));
 444
 445         error = hammer_recover(hmp, rootvol);
 446         if (error) {
 447                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 448                 goto done;
 449         }
 450
 451         /*
 452          * Finish setup now that we have a good root volume.
 453          *
 454          * The top 16 bits of fsid.val[1] is a pfs id.
 455          */
 456         ksnprintf(mp->mnt_stat.f_mntfromname,
 457                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 458                   rootvol->ondisk->vol_name);
 459         mp->mnt_stat.f_fsid.val[0] =
 460                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 461         mp->mnt_stat.f_fsid.val[1] =
 462                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 463         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
 464
 465         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 466         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 467                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 468
 469         /*
 470          * Certain often-modified fields in the root volume are cached in
 471          * the hammer_mount structure so we do not have to generate lots
 472          * of little UNDO structures for them.
 473          *
 474          * Recopy after recovery.  This also has the side effect of
 475          * setting our cached undo FIFO's first_offset, which serves to
 476          * placemark the FIFO start for the NEXT flush cycle while the
 477          * on-disk first_offset represents the LAST flush cycle.
 478          */
 479         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 480         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 481               sizeof(hmp->blockmap));
 482         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 483
 484         hammer_flusher_create(hmp);
 485
 486         /*
 487          * Locate the root directory using the root cluster's B-Tree as a
 488          * starting point.  The root directory uses an obj_id of 1.
 489          *
 490          * FUTURE: Leave the root directory cached referenced but unlocked
 491          * in hmp->rootvp (need to flush it on unmount).
 492          */
 493         error = hammer_vfs_vget(mp, 1, &rootvp);
 494         if (error)
 495                 goto done;
 496         vput(rootvp);
 497         /*vn_unlock(hmp->rootvp);*/
 498
 499 done:
 500         hammer_rel_volume(rootvol, 0);
 501 failed:
 502         /*
 503          * Cleanup and return.
 504          */
 505         if (error)
 506                 hammer_free_hmp(mp);
 507         return (error);
 508 }
 509
 510 static int
 511 hammer_vfs_unmount(struct mount *mp, int mntflags)
 512 {
 513 #if 0
 514         struct hammer_mount *hmp = (void *)mp->mnt_data;
 515 #endif
 516         int flags;
 517         int error;
 518
 519         /*
 520          * Clean out the vnodes
 521          */
 522         flags = 0;
 523         if (mntflags & MNT_FORCE)
 524                 flags |= FORCECLOSE;
 525         if ((error = vflush(mp, 0, flags)) != 0)
 526                 return (error);
 527
 528         /*
 529          * Clean up the internal mount structure and related entities.  This
 530          * may issue I/O.
 531          */
 532         hammer_free_hmp(mp);
 533         return(0);
 534 }
 535
 536 /*
 537  * Clean up the internal mount structure and disassociate it from the mount.
 538  * This may issue I/O.
 539  */
 540 static void
 541 hammer_free_hmp(struct mount *mp)
 542 {
 543         struct hammer_mount *hmp = (void *)mp->mnt_data;
 544
 545 #if 0
 546         /*
 547          * Clean up the root vnode
 548          */
 549         if (hmp->rootvp) {
 550                 vrele(hmp->rootvp);
 551                 hmp->rootvp = NULL;
 552         }
 553 #endif
 554         hammer_flusher_sync(hmp);
 555         hammer_flusher_sync(hmp);
 556         hammer_flusher_destroy(hmp);
 557
 558         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 559
 560 #if 0
 561         /*
 562          * Unload & flush inodes
 563          *
 564          * XXX illegal to call this from here, it can only be done from
 565          * the flusher.
 566          */
 567         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 568                 hammer_unload_inode, (void *)MNT_WAIT);
 569
 570         /*
 571          * Unload & flush volumes
 572          */
 573 #endif
 574         /*
 575          * Unload buffers and then volumes
 576          */
 577         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 578                 hammer_unload_buffer, NULL);
 579         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 580                 hammer_unload_volume, NULL);
 581
 582         mp->mnt_data = NULL;
 583         mp->mnt_flag &= ~MNT_LOCAL;
 584         hmp->mp = NULL;
 585         hammer_destroy_objid_cache(hmp);
 586         kfree(hmp, M_HAMMER);
 587 }
 588
 589 /*
 590  * Obtain a vnode for the specified inode number.  An exclusively locked
 591  * vnode is returned.
 592  */
 593 int
 594 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 595 {
 596         struct hammer_transaction trans;
 597         struct hammer_mount *hmp = (void *)mp->mnt_data;
 598         struct hammer_inode *ip;
 599         int error;
 600
 601         hammer_simple_transaction(&trans, hmp);
 602
 603         /*
 604          * Lookup the requested HAMMER inode.  The structure must be
 605          * left unlocked while we manipulate the related vnode to avoid
 606          * a deadlock.
 607          */
 608         ip = hammer_get_inode(&trans, NULL, ino,
 609                               hmp->asof, HAMMER_DEF_LOCALIZATION,
 610                               0, &error);
 611         if (ip == NULL) {
 612                 *vpp = NULL;
 613                 return(error);
 614         }
 615         error = hammer_get_vnode(ip, vpp);
 616         hammer_rel_inode(ip, 0);
 617         hammer_done_transaction(&trans);
 618         return (error);
 619 }
 620
 621 /*
 622  * Return the root vnode for the filesystem.
 623  *
 624  * HAMMER stores the root vnode in the hammer_mount structure so
 625  * getting it is easy.
 626  */
 627 static int
 628 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 629 {
 630 #if 0
 631         struct hammer_mount *hmp = (void *)mp->mnt_data;
 632 #endif
 633         int error;
 634
 635         error = hammer_vfs_vget(mp, 1, vpp);
 636         return (error);
 637 }
 638
 639 static int
 640 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 641 {
 642         struct hammer_mount *hmp = (void *)mp->mnt_data;
 643         hammer_volume_t volume;
 644         hammer_volume_ondisk_t ondisk;
 645         int error;
 646         int64_t bfree;
 647
 648         volume = hammer_get_root_volume(hmp, &error);
 649         if (error)
 650                 return(error);
 651         ondisk = volume->ondisk;
 652
 653         /*
 654          * Basic stats
 655          */
 656         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 657         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 658         hammer_rel_volume(volume, 0);
 659
 660         mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE;
 661         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 662         if (mp->mnt_stat.f_files < 0)
 663                 mp->mnt_stat.f_files = 0;
 664
 665         *sbp = mp->mnt_stat;
 666         return(0);
 667 }
 668
 669 static int
 670 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 671 {
 672         struct hammer_mount *hmp = (void *)mp->mnt_data;
 673         hammer_volume_t volume;
 674         hammer_volume_ondisk_t ondisk;
 675         int error;
 676         int64_t bfree;
 677
 678         volume = hammer_get_root_volume(hmp, &error);
 679         if (error)
 680                 return(error);
 681         ondisk = volume->ondisk;
 682
 683         /*
 684          * Basic stats
 685          */
 686         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 687         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 688         hammer_rel_volume(volume, 0);
 689
 690         mp->mnt_vstat.f_bfree = bfree / HAMMER_BUFSIZE;
 691         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 692         if (mp->mnt_vstat.f_files < 0)
 693                 mp->mnt_vstat.f_files = 0;
 694         *sbp = mp->mnt_vstat;
 695         return(0);
 696 }
 697
 698 /*
 699  * Sync the filesystem.  Currently we have to run it twice, the second
 700  * one will advance the undo start index to the end index, so if a crash
 701  * occurs no undos will be run on mount.
 702  *
 703  * We do not sync the filesystem if we are called from a panic.  If we did
 704  * we might end up blowing up a sync that was already in progress.
 705  */
 706 static int
 707 hammer_vfs_sync(struct mount *mp, int waitfor)
 708 {
 709         struct hammer_mount *hmp = (void *)mp->mnt_data;
 710         int error;
 711
 712         if (panicstr == NULL) {
 713                 error = hammer_sync_hmp(hmp, waitfor);
 714                 if (error == 0)
 715                         error = hammer_sync_hmp(hmp, waitfor);
 716         } else {
 717                 error = EIO;
 718         }
 719         return (error);
 720 }
 721
 722 /*
 723  * Convert a vnode to a file handle.
 724  */
 725 static int
 726 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 727 {
 728         hammer_inode_t ip;
 729
 730         KKASSERT(MAXFIDSZ >= 16);
 731         ip = VTOI(vp);
 732         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 733         fhp->fid_ext = ip->obj_localization >> 16;
 734         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 735         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 736         return(0);
 737 }
 738
 739
 740 /*
 741  * Convert a file handle back to a vnode.
 742  */
 743 static int
 744 hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
 745 {
 746         struct hammer_transaction trans;
 747         struct hammer_inode *ip;
 748         struct hammer_inode_info info;
 749         int error;
 750         u_int32_t localization;
 751
 752         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 753         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 754         localization = (u_int32_t)fhp->fid_ext << 16;
 755
 756         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
 757
 758         /*
 759          * Get/allocate the hammer_inode structure.  The structure must be
 760          * unlocked while we manipulate the related vnode to avoid a
 761          * deadlock.
 762          */
 763         kprintf("localization %08x\n", localization);
 764         ip = hammer_get_inode(&trans, NULL, info.obj_id,
 765                               info.obj_asof, localization, 0, &error);
 766         if (ip == NULL) {
 767                 *vpp = NULL;
 768                 return(error);
 769         }
 770         error = hammer_get_vnode(ip, vpp);
 771         hammer_rel_inode(ip, 0);
 772         hammer_done_transaction(&trans);
 773         return (error);
 774 }
 775
 776 static int
 777 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 778                     int *exflagsp, struct ucred **credanonp)
 779 {
 780         hammer_mount_t hmp = (void *)mp->mnt_data;
 781         struct netcred *np;
 782         int error;
 783
 784         np = vfs_export_lookup(mp, &hmp->export, nam);
 785         if (np) {
 786                 *exflagsp = np->netc_exflags;
 787                 *credanonp = &np->netc_anon;
 788                 error = 0;
 789         } else {
 790                 error = EACCES;
 791         }
 792         return (error);
 793
 794 }
 795
 796 int
 797 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
 798 {
 799         hammer_mount_t hmp = (void *)mp->mnt_data;
 800         int error;
 801
 802         switch(op) {
 803         case MOUNTCTL_SET_EXPORT:
 804                 error = vfs_export(mp, &hmp->export, export);
 805                 break;
 806         default:
 807                 error = EOPNOTSUPP;
 808                 break;
 809         }
 810         return(error);
 811 }
 812