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 1.46 2008/06/12 00:16:10 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_write_release;         /* if 1 release buffer on strategy */
  60 int hammer_debug_cluster_enable = 1;    /* enable read clustering by default */
  61 int hammer_count_inodes;
  62 int hammer_count_iqueued;
  63 int hammer_count_reclaiming;
  64 int hammer_count_records;
  65 int hammer_count_record_datas;
  66 int hammer_count_volumes;
  67 int hammer_count_buffers;
  68 int hammer_count_nodes;
  69 int hammer_count_dirtybufs;             /* global */
  70 int hammer_count_refedbufs;             /* global */
  71 int hammer_count_reservations;
  72 int hammer_count_io_running_read;
  73 int hammer_count_io_running_write;
  74 int hammer_count_io_locked;
  75 int hammer_stats_btree_iterations;
  76 int hammer_stats_record_iterations;
  77 int hammer_limit_dirtybufs;             /* per-mount */
  78 int hammer_limit_irecs;                 /* per-inode */
  79 int hammer_limit_recs;                  /* as a whole XXX */
  80 int hammer_limit_iqueued;               /* per-mount */
  81 int hammer_bio_count;
  82 int64_t hammer_contention_count;
  83 int64_t hammer_zone_limit;
  84
  85 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
  86 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
  87            &hammer_debug_general, 0, "");
  88 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
  89            &hammer_debug_io, 0, "");
  90 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
  91            &hammer_debug_debug, 0, "");
  92 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
  93            &hammer_debug_inode, 0, "");
  94 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
  95            &hammer_debug_locks, 0, "");
  96 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
  97            &hammer_debug_btree, 0, "");
  98 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
  99            &hammer_debug_tid, 0, "");
 100 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 101            &hammer_debug_recover, 0, "");
 102 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 103            &hammer_debug_recover_faults, 0, "");
 104 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_write_release, CTLFLAG_RW,
 105            &hammer_debug_write_release, 0, "");
 106 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_cluster_enable, CTLFLAG_RW,
 107            &hammer_debug_cluster_enable, 0, "");
 108
 109 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufs, CTLFLAG_RW,
 110            &hammer_limit_dirtybufs, 0, "");
 111 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_irecs, CTLFLAG_RW,
 112            &hammer_limit_irecs, 0, "");
 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 114            &hammer_limit_recs, 0, "");
 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_iqueued, CTLFLAG_RW,
 116            &hammer_limit_iqueued, 0, "");
 117
 118 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 119            &hammer_count_inodes, 0, "");
 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 121            &hammer_count_iqueued, 0, "");
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 123            &hammer_count_reclaiming, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 125            &hammer_count_records, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 127            &hammer_count_record_datas, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 129            &hammer_count_volumes, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 131            &hammer_count_buffers, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 133            &hammer_count_nodes, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufs, CTLFLAG_RD,
 135            &hammer_count_dirtybufs, 0, "");
 136 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 137            &hammer_count_refedbufs, 0, "");
 138 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 139            &hammer_count_reservations, 0, "");
 140 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 141            &hammer_count_io_running_read, 0, "");
 142 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 143            &hammer_count_io_locked, 0, "");
 144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 145            &hammer_count_io_running_write, 0, "");
 146 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 147            &hammer_zone_limit, 0, "");
 148 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 149            &hammer_contention_count, 0, "");
 150
 151 /*
 152  * VFS ABI
 153  */
 154 static void     hammer_free_hmp(struct mount *mp);
 155
 156 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 157                                 struct ucred *cred);
 158 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 159 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 160 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 161                                 struct ucred *cred);
 162 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 163                                 struct ucred *cred);
 164 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 165 static int      hammer_vfs_vget(struct mount *mp, ino_t ino,
 166                                 struct vnode **vpp);
 167 static int      hammer_vfs_init(struct vfsconf *conf);
 168 static int      hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp,
 169                                 struct vnode **vpp);
 170 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 171 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 172                                 int *exflagsp, struct ucred **credanonp);
 173
 174
 175 static struct vfsops hammer_vfsops = {
 176         .vfs_mount      = hammer_vfs_mount,
 177         .vfs_unmount    = hammer_vfs_unmount,
 178         .vfs_root       = hammer_vfs_root,
 179         .vfs_statfs     = hammer_vfs_statfs,
 180         .vfs_statvfs    = hammer_vfs_statvfs,
 181         .vfs_sync       = hammer_vfs_sync,
 182         .vfs_vget       = hammer_vfs_vget,
 183         .vfs_init       = hammer_vfs_init,
 184         .vfs_vptofh     = hammer_vfs_vptofh,
 185         .vfs_fhtovp     = hammer_vfs_fhtovp,
 186         .vfs_checkexp   = hammer_vfs_checkexp
 187 };
 188
 189 MALLOC_DEFINE(M_HAMMER, "hammer-mount", "hammer mount");
 190
 191 VFS_SET(hammer_vfsops, hammer, 0);
 192 MODULE_VERSION(hammer, 1);
 193
 194 static int
 195 hammer_vfs_init(struct vfsconf *conf)
 196 {
 197         if (hammer_limit_irecs == 0)
 198                 hammer_limit_irecs = nbuf * 8;
 199         if (hammer_limit_recs == 0)             /* XXX TODO */
 200                 hammer_limit_recs = nbuf * 25;
 201         if (hammer_limit_dirtybufs == 0) {
 202                 hammer_limit_dirtybufs = hidirtybuffers / 2;
 203                 if (hammer_limit_dirtybufs < 100)
 204                         hammer_limit_dirtybufs = 100;
 205         }
 206         if (hammer_limit_iqueued == 0)
 207                 hammer_limit_iqueued = desiredvnodes / 5;
 208         return(0);
 209 }
 210
 211 static int
 212 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 213                  struct ucred *cred)
 214 {
 215         struct hammer_mount_info info;
 216         hammer_mount_t hmp;
 217         hammer_volume_t rootvol;
 218         struct vnode *rootvp;
 219         const char *upath;      /* volume name in userspace */
 220         char *path;             /* volume name in system space */
 221         int error;
 222         int i;
 223
 224         if ((error = copyin(data, &info, sizeof(info))) != 0)
 225                 return (error);
 226         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 227                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 228                         return (EINVAL);
 229         }
 230
 231         /*
 232          * Interal mount data structure
 233          */
 234         if (mp->mnt_flag & MNT_UPDATE) {
 235                 hmp = (void *)mp->mnt_data;
 236                 KKASSERT(hmp != NULL);
 237         } else {
 238                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 239                 mp->mnt_data = (qaddr_t)hmp;
 240                 hmp->mp = mp;
 241                 hmp->zbuf = kmalloc(HAMMER_BUFSIZE, M_HAMMER, M_WAITOK|M_ZERO);
 242                 hmp->namekey_iterator = mycpu->gd_time_seconds;
 243                 /*TAILQ_INIT(&hmp->recycle_list);*/
 244
 245                 hmp->root_btree_beg.localization = HAMMER_MIN_LOCALIZATION;
 246                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 247                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 248                 hmp->root_btree_beg.create_tid = 1;
 249                 hmp->root_btree_beg.delete_tid = 1;
 250                 hmp->root_btree_beg.rec_type = 0;
 251                 hmp->root_btree_beg.obj_type = 0;
 252
 253                 hmp->root_btree_end.localization = HAMMER_MAX_LOCALIZATION;
 254                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 255                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 256                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 257                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 258                 hmp->root_btree_end.rec_type = 0xFFFFU;
 259                 hmp->root_btree_end.obj_type = 0;
 260
 261                 hmp->sync_lock.refs = 1;
 262                 hmp->free_lock.refs = 1;
 263                 hmp->undo_lock.refs = 1;
 264                 hmp->blkmap_lock.refs = 1;
 265
 266                 TAILQ_INIT(&hmp->flush_list);
 267                 TAILQ_INIT(&hmp->delay_list);
 268                 TAILQ_INIT(&hmp->objid_cache_list);
 269                 TAILQ_INIT(&hmp->undo_lru_list);
 270
 271                 /*
 272                  * Set default zone limits.  This value can be reduced
 273                  * further by the zone limit specified in the root volume.
 274                  *
 275                  * The sysctl can force a small zone limit for debugging
 276                  * purposes.
 277                  */
 278                 for (i = 0; i < HAMMER_MAX_ZONES; ++i) {
 279                         hmp->zone_limits[i] =
 280                                 HAMMER_ZONE_ENCODE(i, HAMMER_ZONE_LIMIT);
 281
 282                         if (hammer_zone_limit) {
 283                                 hmp->zone_limits[i] =
 284                                     HAMMER_ZONE_ENCODE(i, hammer_zone_limit);
 285                         }
 286                         hammer_init_holes(hmp, &hmp->holes[i]);
 287                 }
 288         }
 289         hmp->hflags &= ~HMNT_USERFLAGS;
 290         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 291         if (info.asof) {
 292                 kprintf("ASOF\n");
 293                 mp->mnt_flag |= MNT_RDONLY;
 294                 hmp->asof = info.asof;
 295         } else {
 296                 hmp->asof = HAMMER_MAX_TID;
 297         }
 298
 299         /*
 300          * Re-open read-write if originally read-only, or vise-versa.
 301          */
 302         if (mp->mnt_flag & MNT_UPDATE) {
 303                 error = 0;
 304                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 305                         kprintf("HAMMER read-only -> read-write\n");
 306                         hmp->ronly = 0;
 307                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 308                                 hammer_adjust_volume_mode, NULL);
 309                         rootvol = hammer_get_root_volume(hmp, &error);
 310                         if (rootvol) {
 311                                 hammer_recover_flush_buffers(hmp, rootvol);
 312                                 bcopy(rootvol->ondisk->vol0_blockmap,
 313                                       hmp->blockmap,
 314                                       sizeof(hmp->blockmap));
 315                                 hammer_rel_volume(rootvol, 0);
 316                         }
 317                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 318                                 hammer_reload_inode, NULL);
 319                         /* kernel clears MNT_RDONLY */
 320                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 321                         kprintf("HAMMER read-write -> read-only\n");
 322                         hmp->ronly = 1; /* messy */
 323                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 324                                 hammer_reload_inode, NULL);
 325                         hmp->ronly = 0;
 326                         hammer_flusher_sync(hmp);
 327                         hammer_flusher_sync(hmp);
 328                         hammer_flusher_sync(hmp);
 329                         hmp->ronly = 1;
 330                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 331                                 hammer_adjust_volume_mode, NULL);
 332                 }
 333                 return(error);
 334         }
 335
 336         RB_INIT(&hmp->rb_vols_root);
 337         RB_INIT(&hmp->rb_inos_root);
 338         RB_INIT(&hmp->rb_nods_root);
 339         RB_INIT(&hmp->rb_undo_root);
 340         RB_INIT(&hmp->rb_resv_root);
 341         RB_INIT(&hmp->rb_bufs_root);
 342
 343         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 344
 345         TAILQ_INIT(&hmp->volu_list);
 346         TAILQ_INIT(&hmp->undo_list);
 347         TAILQ_INIT(&hmp->data_list);
 348         TAILQ_INIT(&hmp->meta_list);
 349         TAILQ_INIT(&hmp->lose_list);
 350
 351         /*
 352          * Load volumes
 353          */
 354         path = objcache_get(namei_oc, M_WAITOK);
 355         hmp->nvolumes = info.nvolumes;
 356         for (i = 0; i < info.nvolumes; ++i) {
 357                 error = copyin(&info.volumes[i], &upath, sizeof(char *));
 358                 if (error == 0)
 359                         error = copyinstr(upath, path, MAXPATHLEN, NULL);
 360                 if (error == 0)
 361                         error = hammer_install_volume(hmp, path);
 362                 if (error)
 363                         break;
 364         }
 365         objcache_put(namei_oc, path);
 366
 367         /*
 368          * Make sure we found a root volume
 369          */
 370         if (error == 0 && hmp->rootvol == NULL) {
 371                 kprintf("hammer_mount: No root volume found!\n");
 372                 error = EINVAL;
 373         }
 374         if (error) {
 375                 hammer_free_hmp(mp);
 376                 return (error);
 377         }
 378
 379         /*
 380          * No errors, setup enough of the mount point so we can lookup the
 381          * root vnode.
 382          */
 383         mp->mnt_iosize_max = MAXPHYS;
 384         mp->mnt_kern_flag |= MNTK_FSMID;
 385
 386         /*
 387          * note: f_iosize is used by vnode_pager_haspage() when constructing
 388          * its VOP_BMAP call.
 389          */
 390         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 391         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 392
 393         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 394         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 395
 396         mp->mnt_maxsymlinklen = 255;
 397         mp->mnt_flag |= MNT_LOCAL;
 398
 399         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 400         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 401         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 402
 403         /*
 404          * The root volume's ondisk pointer is only valid if we hold a
 405          * reference to it.
 406          */
 407         rootvol = hammer_get_root_volume(hmp, &error);
 408         if (error)
 409                 goto failed;
 410
 411         /*
 412          * Perform any necessary UNDO operations.  The recovery code does
 413          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 414          * and then re-copy it again after recovery is complete.
 415          *
 416          * If this is a read-only mount the UNDO information is retained
 417          * in memory in the form of dirty buffer cache buffers, and not
 418          * written back to the media.
 419          */
 420         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 421               sizeof(hmp->blockmap));
 422
 423         error = hammer_recover(hmp, rootvol);
 424         if (error) {
 425                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 426                 goto done;
 427         }
 428
 429         /*
 430          * Finish setup now that we have a good root volume
 431          */
 432         ksnprintf(mp->mnt_stat.f_mntfromname,
 433                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 434                   rootvol->ondisk->vol_name);
 435         mp->mnt_stat.f_fsid.val[0] =
 436                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 437         mp->mnt_stat.f_fsid.val[1] =
 438                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 439
 440         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 441         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 442                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 443
 444         /*
 445          * Certain often-modified fields in the root volume are cached in
 446          * the hammer_mount structure so we do not have to generate lots
 447          * of little UNDO structures for them.
 448          *
 449          * Recopy after recovery.  This also has the side effect of
 450          * setting our cached undo FIFO's first_offset, which serves to
 451          * placemark the FIFO start for the NEXT flush cycle while the
 452          * on-disk first_offset represents the LAST flush cycle.
 453          */
 454         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 455         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 456               sizeof(hmp->blockmap));
 457         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 458
 459         /*
 460          * Use the zone limit set by newfs_hammer, or the zone limit set by
 461          * sysctl (for debugging), whichever is smaller.
 462          */
 463         if (rootvol->ondisk->vol0_zone_limit) {
 464                 hammer_off_t vol0_zone_limit;
 465
 466                 vol0_zone_limit = rootvol->ondisk->vol0_zone_limit;
 467                 for (i = 0; i < HAMMER_MAX_ZONES; ++i) {
 468                         if (hmp->zone_limits[i] > vol0_zone_limit)
 469                                 hmp->zone_limits[i] = vol0_zone_limit;
 470                 }
 471         }
 472
 473         hammer_flusher_create(hmp);
 474
 475         /*
 476          * Locate the root directory using the root cluster's B-Tree as a
 477          * starting point.  The root directory uses an obj_id of 1.
 478          *
 479          * FUTURE: Leave the root directory cached referenced but unlocked
 480          * in hmp->rootvp (need to flush it on unmount).
 481          */
 482         error = hammer_vfs_vget(mp, 1, &rootvp);
 483         if (error)
 484                 goto done;
 485         vput(rootvp);
 486         /*vn_unlock(hmp->rootvp);*/
 487
 488 done:
 489         hammer_rel_volume(rootvol, 0);
 490 failed:
 491         /*
 492          * Cleanup and return.
 493          */
 494         if (error)
 495                 hammer_free_hmp(mp);
 496         return (error);
 497 }
 498
 499 static int
 500 hammer_vfs_unmount(struct mount *mp, int mntflags)
 501 {
 502 #if 0
 503         struct hammer_mount *hmp = (void *)mp->mnt_data;
 504 #endif
 505         int flags;
 506         int error;
 507
 508         /*
 509          * Clean out the vnodes
 510          */
 511         flags = 0;
 512         if (mntflags & MNT_FORCE)
 513                 flags |= FORCECLOSE;
 514         if ((error = vflush(mp, 0, flags)) != 0)
 515                 return (error);
 516
 517         /*
 518          * Clean up the internal mount structure and related entities.  This
 519          * may issue I/O.
 520          */
 521         hammer_free_hmp(mp);
 522         return(0);
 523 }
 524
 525 /*
 526  * Clean up the internal mount structure and disassociate it from the mount.
 527  * This may issue I/O.
 528  */
 529 static void
 530 hammer_free_hmp(struct mount *mp)
 531 {
 532         struct hammer_mount *hmp = (void *)mp->mnt_data;
 533         int i;
 534
 535 #if 0
 536         /*
 537          * Clean up the root vnode
 538          */
 539         if (hmp->rootvp) {
 540                 vrele(hmp->rootvp);
 541                 hmp->rootvp = NULL;
 542         }
 543 #endif
 544         kprintf("X1");
 545         hammer_flusher_sync(hmp);
 546         kprintf("X2");
 547         hammer_flusher_sync(hmp);
 548         kprintf("X3");
 549         hammer_flusher_destroy(hmp);
 550         kprintf("X4");
 551
 552         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 553
 554 #if 0
 555         /*
 556          * Unload & flush inodes
 557          *
 558          * XXX illegal to call this from here, it can only be done from
 559          * the flusher.
 560          */
 561         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 562                 hammer_unload_inode, (void *)MNT_WAIT);
 563
 564         /*
 565          * Unload & flush volumes
 566          */
 567 #endif
 568         /*
 569          * Unload buffers and then volumes
 570          */
 571         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 572                 hammer_unload_buffer, NULL);
 573         kprintf("X5");
 574         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 575                 hammer_unload_volume, NULL);
 576         kprintf("X6");
 577
 578         mp->mnt_data = NULL;
 579         mp->mnt_flag &= ~MNT_LOCAL;
 580         hmp->mp = NULL;
 581         kprintf("X7");
 582         hammer_destroy_objid_cache(hmp);
 583         kprintf("X8");
 584         kfree(hmp->zbuf, M_HAMMER);
 585         kprintf("X9");
 586         kprintf("X10");
 587
 588         for (i = 0; i < HAMMER_MAX_ZONES; ++i)
 589                 hammer_free_holes(hmp, &hmp->holes[i]);
 590         kprintf("X11");
 591
 592         kfree(hmp, M_HAMMER);
 593         kprintf("X12");
 594 }
 595
 596 /*
 597  * Obtain a vnode for the specified inode number.  An exclusively locked
 598  * vnode is returned.
 599  */
 600 int
 601 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 602 {
 603         struct hammer_transaction trans;
 604         struct hammer_mount *hmp = (void *)mp->mnt_data;
 605         struct hammer_inode *ip;
 606         int error;
 607
 608         hammer_simple_transaction(&trans, hmp);
 609
 610         /*
 611          * Lookup the requested HAMMER inode.  The structure must be
 612          * left unlocked while we manipulate the related vnode to avoid
 613          * a deadlock.
 614          */
 615         ip = hammer_get_inode(&trans, NULL, ino, hmp->asof, 0, &error);
 616         if (ip == NULL) {
 617                 *vpp = NULL;
 618                 return(error);
 619         }
 620         error = hammer_get_vnode(ip, vpp);
 621         hammer_rel_inode(ip, 0);
 622         hammer_done_transaction(&trans);
 623         return (error);
 624 }
 625
 626 /*
 627  * Return the root vnode for the filesystem.
 628  *
 629  * HAMMER stores the root vnode in the hammer_mount structure so
 630  * getting it is easy.
 631  */
 632 static int
 633 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 634 {
 635 #if 0
 636         struct hammer_mount *hmp = (void *)mp->mnt_data;
 637 #endif
 638         int error;
 639
 640         error = hammer_vfs_vget(mp, 1, vpp);
 641         return (error);
 642 }
 643
 644 static int
 645 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 646 {
 647         struct hammer_mount *hmp = (void *)mp->mnt_data;
 648         hammer_volume_t volume;
 649         hammer_volume_ondisk_t ondisk;
 650         int error;
 651         int64_t bfree;
 652
 653         volume = hammer_get_root_volume(hmp, &error);
 654         if (error)
 655                 return(error);
 656         ondisk = volume->ondisk;
 657
 658         /*
 659          * Basic stats
 660          */
 661         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 662         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 663         hammer_rel_volume(volume, 0);
 664
 665         mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE;
 666         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 667         if (mp->mnt_stat.f_files < 0)
 668                 mp->mnt_stat.f_files = 0;
 669
 670         *sbp = mp->mnt_stat;
 671         return(0);
 672 }
 673
 674 static int
 675 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 676 {
 677         struct hammer_mount *hmp = (void *)mp->mnt_data;
 678         hammer_volume_t volume;
 679         hammer_volume_ondisk_t ondisk;
 680         int error;
 681         int64_t bfree;
 682
 683         volume = hammer_get_root_volume(hmp, &error);
 684         if (error)
 685                 return(error);
 686         ondisk = volume->ondisk;
 687
 688         /*
 689          * Basic stats
 690          */
 691         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 692         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 693         hammer_rel_volume(volume, 0);
 694
 695         mp->mnt_vstat.f_bfree = bfree / HAMMER_BUFSIZE;
 696         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 697         if (mp->mnt_vstat.f_files < 0)
 698                 mp->mnt_vstat.f_files = 0;
 699         *sbp = mp->mnt_vstat;
 700         return(0);
 701 }
 702
 703 /*
 704  * Sync the filesystem.  Currently we have to run it twice, the second
 705  * one will advance the undo start index to the end index, so if a crash
 706  * occurs no undos will be run on mount.
 707  *
 708  * We do not sync the filesystem if we are called from a panic.  If we did
 709  * we might end up blowing up a sync that was already in progress.
 710  */
 711 static int
 712 hammer_vfs_sync(struct mount *mp, int waitfor)
 713 {
 714         struct hammer_mount *hmp = (void *)mp->mnt_data;
 715         int error;
 716
 717         if (panicstr == NULL) {
 718                 error = hammer_sync_hmp(hmp, waitfor);
 719                 if (error == 0)
 720                         error = hammer_sync_hmp(hmp, waitfor);
 721         } else {
 722                 error = EIO;
 723         }
 724         return (error);
 725 }
 726
 727 /*
 728  * Convert a vnode to a file handle.
 729  */
 730 static int
 731 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 732 {
 733         hammer_inode_t ip;
 734
 735         KKASSERT(MAXFIDSZ >= 16);
 736         ip = VTOI(vp);
 737         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 738         fhp->fid_reserved = 0;
 739         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 740         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 741         return(0);
 742 }
 743
 744
 745 /*
 746  * Convert a file handle back to a vnode.
 747  */
 748 static int
 749 hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
 750 {
 751         struct hammer_transaction trans;
 752         struct hammer_inode *ip;
 753         struct hammer_inode_info info;
 754         int error;
 755
 756         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 757         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 758
 759         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
 760
 761         /*
 762          * Get/allocate the hammer_inode structure.  The structure must be
 763          * unlocked while we manipulate the related vnode to avoid a
 764          * deadlock.
 765          */
 766         ip = hammer_get_inode(&trans, NULL, info.obj_id, info.obj_asof,
 767                               0, &error);
 768         if (ip == NULL) {
 769                 *vpp = NULL;
 770                 return(error);
 771         }
 772         error = hammer_get_vnode(ip, vpp);
 773         hammer_rel_inode(ip, 0);
 774         hammer_done_transaction(&trans);
 775         return (error);
 776 }
 777
 778 static int
 779 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 780                     int *exflagsp, struct ucred **credanonp)
 781 {
 782         hammer_mount_t hmp = (void *)mp->mnt_data;
 783         struct netcred *np;
 784         int error;
 785
 786         np = vfs_export_lookup(mp, &hmp->export, nam);
 787         if (np) {
 788                 *exflagsp = np->netc_exflags;
 789                 *credanonp = &np->netc_anon;
 790                 error = 0;
 791         } else {
 792                 error = EACCES;
 793         }
 794         return (error);
 795
 796 }
 797
 798 int
 799 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
 800 {
 801         hammer_mount_t hmp = (void *)mp->mnt_data;
 802         int error;
 803
 804         switch(op) {
 805         case MOUNTCTL_SET_EXPORT:
 806                 error = vfs_export(mp, &hmp->export, export);
 807                 break;
 808         default:
 809                 error = EOPNOTSUPP;
 810                 break;
 811         }
 812         return(error);
 813 }
 814