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 1.56 2008/06/28 23:50:37 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_stats_btree_lookups;
  69 int64_t hammer_stats_btree_searches;
  70 int64_t hammer_stats_btree_inserts;
  71 int64_t hammer_stats_btree_deletes;
  72 int64_t hammer_stats_btree_elements;
  73 int64_t hammer_stats_btree_splits;
  74 int64_t hammer_stats_btree_iterations;
  75 int64_t hammer_stats_record_iterations;
  76 int hammer_count_dirtybufspace;         /* global */
  77 int hammer_count_refedbufs;             /* global */
  78 int hammer_count_reservations;
  79 int hammer_count_io_running_read;
  80 int hammer_count_io_running_write;
  81 int hammer_count_io_locked;
  82 int hammer_limit_dirtybufspace;         /* per-mount */
  83 int hammer_limit_recs;                  /* as a whole XXX */
  84 int hammer_limit_iqueued;               /* per-mount */
  85 int hammer_bio_count;
  86 int hammer_verify_zone;
  87 int hammer_write_mode;
  88 int64_t hammer_contention_count;
  89 int64_t hammer_zone_limit;
  90
  91 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
  92 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
  93            &hammer_debug_general, 0, "");
  94 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
  95            &hammer_debug_io, 0, "");
  96 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
  97            &hammer_debug_debug, 0, "");
  98 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
  99            &hammer_debug_inode, 0, "");
 100 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
 101            &hammer_debug_locks, 0, "");
 102 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
 103            &hammer_debug_btree, 0, "");
 104 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
 105            &hammer_debug_tid, 0, "");
 106 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
 107            &hammer_debug_recover, 0, "");
 108 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
 109            &hammer_debug_recover_faults, 0, "");
 110 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_cluster_enable, CTLFLAG_RW,
 111            &hammer_debug_cluster_enable, 0, "");
 112
 113 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
 114            &hammer_limit_dirtybufspace, 0, "");
 115 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
 116            &hammer_limit_recs, 0, "");
 117 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_iqueued, CTLFLAG_RW,
 118            &hammer_limit_iqueued, 0, "");
 119
 120 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
 121            &hammer_count_inodes, 0, "");
 122 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
 123            &hammer_count_iqueued, 0, "");
 124 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
 125            &hammer_count_reclaiming, 0, "");
 126 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
 127            &hammer_count_records, 0, "");
 128 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
 129            &hammer_count_record_datas, 0, "");
 130 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
 131            &hammer_count_volumes, 0, "");
 132 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
 133            &hammer_count_buffers, 0, "");
 134 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
 135            &hammer_count_nodes, 0, "");
 136 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
 137            &hammer_stats_btree_searches, 0, "");
 138 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
 139            &hammer_stats_btree_lookups, 0, "");
 140 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
 141            &hammer_stats_btree_inserts, 0, "");
 142 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
 143            &hammer_stats_btree_deletes, 0, "");
 144 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
 145            &hammer_stats_btree_elements, 0, "");
 146 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
 147            &hammer_stats_btree_splits, 0, "");
 148 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
 149            &hammer_stats_btree_iterations, 0, "");
 150 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
 151            &hammer_stats_record_iterations, 0, "");
 152 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
 153            &hammer_count_dirtybufspace, 0, "");
 154 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
 155            &hammer_count_refedbufs, 0, "");
 156 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
 157            &hammer_count_reservations, 0, "");
 158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
 159            &hammer_count_io_running_read, 0, "");
 160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
 161            &hammer_count_io_locked, 0, "");
 162 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
 163            &hammer_count_io_running_write, 0, "");
 164 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
 165            &hammer_zone_limit, 0, "");
 166 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
 167            &hammer_contention_count, 0, "");
 168 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
 169            &hammer_verify_zone, 0, "");
 170 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
 171            &hammer_write_mode, 0, "");
 172
 173 KTR_INFO_MASTER(hammer);
 174
 175 /*
 176  * VFS ABI
 177  */
 178 static void     hammer_free_hmp(struct mount *mp);
 179
 180 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
 181                                 struct ucred *cred);
 182 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
 183 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
 184 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
 185                                 struct ucred *cred);
 186 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 187                                 struct ucred *cred);
 188 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
 189 static int      hammer_vfs_vget(struct mount *mp, ino_t ino,
 190                                 struct vnode **vpp);
 191 static int      hammer_vfs_init(struct vfsconf *conf);
 192 static int      hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp,
 193                                 struct vnode **vpp);
 194 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 195 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 196                                 int *exflagsp, struct ucred **credanonp);
 197
 198
 199 static struct vfsops hammer_vfsops = {
 200         .vfs_mount      = hammer_vfs_mount,
 201         .vfs_unmount    = hammer_vfs_unmount,
 202         .vfs_root       = hammer_vfs_root,
 203         .vfs_statfs     = hammer_vfs_statfs,
 204         .vfs_statvfs    = hammer_vfs_statvfs,
 205         .vfs_sync       = hammer_vfs_sync,
 206         .vfs_vget       = hammer_vfs_vget,
 207         .vfs_init       = hammer_vfs_init,
 208         .vfs_vptofh     = hammer_vfs_vptofh,
 209         .vfs_fhtovp     = hammer_vfs_fhtovp,
 210         .vfs_checkexp   = hammer_vfs_checkexp
 211 };
 212
 213 MALLOC_DEFINE(M_HAMMER, "hammer-mount", "hammer mount");
 214
 215 VFS_SET(hammer_vfsops, hammer, 0);
 216 MODULE_VERSION(hammer, 1);
 217
 218 static int
 219 hammer_vfs_init(struct vfsconf *conf)
 220 {
 221         if (hammer_limit_recs == 0)             /* XXX TODO */
 222                 hammer_limit_recs = nbuf * 25;
 223         if (hammer_limit_dirtybufspace == 0) {
 224                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
 225                 if (hammer_limit_dirtybufspace < 100)
 226                         hammer_limit_dirtybufspace = 100;
 227         }
 228         if (hammer_limit_iqueued == 0)
 229                 hammer_limit_iqueued = desiredvnodes / 5;
 230         return(0);
 231 }
 232
 233 static int
 234 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 235                  struct ucred *cred)
 236 {
 237         struct hammer_mount_info info;
 238         hammer_mount_t hmp;
 239         hammer_volume_t rootvol;
 240         struct vnode *rootvp;
 241         const char *upath;      /* volume name in userspace */
 242         char *path;             /* volume name in system space */
 243         int error;
 244         int i;
 245
 246         if ((error = copyin(data, &info, sizeof(info))) != 0)
 247                 return (error);
 248         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 249                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 250                         return (EINVAL);
 251         }
 252         if ((info.hflags & HMNT_MASTERID) &&
 253             (info.masterid < -1 || info.masterid >= HAMMER_MAX_MASTERS)) {
 254                         return (EINVAL);
 255         }
 256
 257         /*
 258          * Interal mount data structure
 259          */
 260         if (mp->mnt_flag & MNT_UPDATE) {
 261                 hmp = (void *)mp->mnt_data;
 262                 KKASSERT(hmp != NULL);
 263         } else {
 264                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 265                 mp->mnt_data = (qaddr_t)hmp;
 266                 hmp->mp = mp;
 267                 hmp->namekey_iterator = mycpu->gd_time_seconds;
 268                 /*TAILQ_INIT(&hmp->recycle_list);*/
 269
 270                 hmp->root_btree_beg.localization = 0x00000000U;
 271                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
 272                 hmp->root_btree_beg.key = -0x8000000000000000LL;
 273                 hmp->root_btree_beg.create_tid = 1;
 274                 hmp->root_btree_beg.delete_tid = 1;
 275                 hmp->root_btree_beg.rec_type = 0;
 276                 hmp->root_btree_beg.obj_type = 0;
 277
 278                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
 279                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
 280                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
 281                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
 282                 hmp->root_btree_end.delete_tid = 0;   /* special case */
 283                 hmp->root_btree_end.rec_type = 0xFFFFU;
 284                 hmp->root_btree_end.obj_type = 0;
 285
 286                 hmp->sync_lock.refs = 1;
 287                 hmp->free_lock.refs = 1;
 288                 hmp->undo_lock.refs = 1;
 289                 hmp->blkmap_lock.refs = 1;
 290
 291                 TAILQ_INIT(&hmp->flush_list);
 292                 TAILQ_INIT(&hmp->delay_list);
 293                 TAILQ_INIT(&hmp->objid_cache_list);
 294                 TAILQ_INIT(&hmp->undo_lru_list);
 295                 TAILQ_INIT(&hmp->reclaim_list);
 296         }
 297         hmp->hflags &= ~HMNT_USERFLAGS;
 298         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
 299         if (info.hflags & HMNT_MASTERID)
 300                 hmp->masterid = info.masterid;
 301         else
 302                 hmp->masterid = -1;
 303         if (info.asof) {
 304                 kprintf("ASOF\n");
 305                 mp->mnt_flag |= MNT_RDONLY;
 306                 hmp->asof = info.asof;
 307         } else {
 308                 hmp->asof = HAMMER_MAX_TID;
 309         }
 310
 311         /*
 312          * Re-open read-write if originally read-only, or vise-versa.
 313          */
 314         if (mp->mnt_flag & MNT_UPDATE) {
 315                 error = 0;
 316                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 317                         kprintf("HAMMER read-only -> read-write\n");
 318                         hmp->ronly = 0;
 319                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 320                                 hammer_adjust_volume_mode, NULL);
 321                         rootvol = hammer_get_root_volume(hmp, &error);
 322                         if (rootvol) {
 323                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
 324                                 bcopy(rootvol->ondisk->vol0_blockmap,
 325                                       hmp->blockmap,
 326                                       sizeof(hmp->blockmap));
 327                                 hammer_rel_volume(rootvol, 0);
 328                         }
 329                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 330                                 hammer_reload_inode, NULL);
 331                         /* kernel clears MNT_RDONLY */
 332                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 333                         kprintf("HAMMER read-write -> read-only\n");
 334                         hmp->ronly = 1; /* messy */
 335                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 336                                 hammer_reload_inode, NULL);
 337                         hmp->ronly = 0;
 338                         hammer_flusher_sync(hmp);
 339                         hammer_flusher_sync(hmp);
 340                         hammer_flusher_sync(hmp);
 341                         hmp->ronly = 1;
 342                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 343                                 hammer_adjust_volume_mode, NULL);
 344                 }
 345                 return(error);
 346         }
 347
 348         RB_INIT(&hmp->rb_vols_root);
 349         RB_INIT(&hmp->rb_inos_root);
 350         RB_INIT(&hmp->rb_nods_root);
 351         RB_INIT(&hmp->rb_undo_root);
 352         RB_INIT(&hmp->rb_resv_root);
 353         RB_INIT(&hmp->rb_bufs_root);
 354
 355         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 356
 357         TAILQ_INIT(&hmp->volu_list);
 358         TAILQ_INIT(&hmp->undo_list);
 359         TAILQ_INIT(&hmp->data_list);
 360         TAILQ_INIT(&hmp->meta_list);
 361         TAILQ_INIT(&hmp->lose_list);
 362
 363         /*
 364          * Load volumes
 365          */
 366         path = objcache_get(namei_oc, M_WAITOK);
 367         hmp->nvolumes = info.nvolumes;
 368         for (i = 0; i < info.nvolumes; ++i) {
 369                 error = copyin(&info.volumes[i], &upath, sizeof(char *));
 370                 if (error == 0)
 371                         error = copyinstr(upath, path, MAXPATHLEN, NULL);
 372                 if (error == 0)
 373                         error = hammer_install_volume(hmp, path);
 374                 if (error)
 375                         break;
 376         }
 377         objcache_put(namei_oc, path);
 378
 379         /*
 380          * Make sure we found a root volume
 381          */
 382         if (error == 0 && hmp->rootvol == NULL) {
 383                 kprintf("hammer_mount: No root volume found!\n");
 384                 error = EINVAL;
 385         }
 386         if (error) {
 387                 hammer_free_hmp(mp);
 388                 return (error);
 389         }
 390
 391         /*
 392          * No errors, setup enough of the mount point so we can lookup the
 393          * root vnode.
 394          */
 395         mp->mnt_iosize_max = MAXPHYS;
 396         mp->mnt_kern_flag |= MNTK_FSMID;
 397
 398         /*
 399          * note: f_iosize is used by vnode_pager_haspage() when constructing
 400          * its VOP_BMAP call.
 401          */
 402         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 403         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 404
 405         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
 406         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
 407
 408         mp->mnt_maxsymlinklen = 255;
 409         mp->mnt_flag |= MNT_LOCAL;
 410
 411         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 412         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 413         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 414
 415         /*
 416          * The root volume's ondisk pointer is only valid if we hold a
 417          * reference to it.
 418          */
 419         rootvol = hammer_get_root_volume(hmp, &error);
 420         if (error)
 421                 goto failed;
 422
 423         /*
 424          * Perform any necessary UNDO operations.  The recovery code does
 425          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
 426          * and then re-copy it again after recovery is complete.
 427          *
 428          * If this is a read-only mount the UNDO information is retained
 429          * in memory in the form of dirty buffer cache buffers, and not
 430          * written back to the media.
 431          */
 432         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 433               sizeof(hmp->blockmap));
 434
 435         error = hammer_recover(hmp, rootvol);
 436         if (error) {
 437                 kprintf("Failed to recover HAMMER filesystem on mount\n");
 438                 goto done;
 439         }
 440
 441         /*
 442          * Finish setup now that we have a good root volume
 443          */
 444         ksnprintf(mp->mnt_stat.f_mntfromname,
 445                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 446                   rootvol->ondisk->vol_name);
 447         mp->mnt_stat.f_fsid.val[0] =
 448                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
 449         mp->mnt_stat.f_fsid.val[1] =
 450                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
 451
 452         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
 453         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
 454                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
 455
 456         /*
 457          * Certain often-modified fields in the root volume are cached in
 458          * the hammer_mount structure so we do not have to generate lots
 459          * of little UNDO structures for them.
 460          *
 461          * Recopy after recovery.  This also has the side effect of
 462          * setting our cached undo FIFO's first_offset, which serves to
 463          * placemark the FIFO start for the NEXT flush cycle while the
 464          * on-disk first_offset represents the LAST flush cycle.
 465          */
 466         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
 467         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
 468               sizeof(hmp->blockmap));
 469         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
 470
 471         hammer_flusher_create(hmp);
 472
 473         /*
 474          * Locate the root directory using the root cluster's B-Tree as a
 475          * starting point.  The root directory uses an obj_id of 1.
 476          *
 477          * FUTURE: Leave the root directory cached referenced but unlocked
 478          * in hmp->rootvp (need to flush it on unmount).
 479          */
 480         error = hammer_vfs_vget(mp, 1, &rootvp);
 481         if (error)
 482                 goto done;
 483         vput(rootvp);
 484         /*vn_unlock(hmp->rootvp);*/
 485
 486 done:
 487         hammer_rel_volume(rootvol, 0);
 488 failed:
 489         /*
 490          * Cleanup and return.
 491          */
 492         if (error)
 493                 hammer_free_hmp(mp);
 494         return (error);
 495 }
 496
 497 static int
 498 hammer_vfs_unmount(struct mount *mp, int mntflags)
 499 {
 500 #if 0
 501         struct hammer_mount *hmp = (void *)mp->mnt_data;
 502 #endif
 503         int flags;
 504         int error;
 505
 506         /*
 507          * Clean out the vnodes
 508          */
 509         flags = 0;
 510         if (mntflags & MNT_FORCE)
 511                 flags |= FORCECLOSE;
 512         if ((error = vflush(mp, 0, flags)) != 0)
 513                 return (error);
 514
 515         /*
 516          * Clean up the internal mount structure and related entities.  This
 517          * may issue I/O.
 518          */
 519         hammer_free_hmp(mp);
 520         return(0);
 521 }
 522
 523 /*
 524  * Clean up the internal mount structure and disassociate it from the mount.
 525  * This may issue I/O.
 526  */
 527 static void
 528 hammer_free_hmp(struct mount *mp)
 529 {
 530         struct hammer_mount *hmp = (void *)mp->mnt_data;
 531
 532 #if 0
 533         /*
 534          * Clean up the root vnode
 535          */
 536         if (hmp->rootvp) {
 537                 vrele(hmp->rootvp);
 538                 hmp->rootvp = NULL;
 539         }
 540 #endif
 541         hammer_flusher_sync(hmp);
 542         hammer_flusher_sync(hmp);
 543         hammer_flusher_destroy(hmp);
 544
 545         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
 546
 547 #if 0
 548         /*
 549          * Unload & flush inodes
 550          *
 551          * XXX illegal to call this from here, it can only be done from
 552          * the flusher.
 553          */
 554         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 555                 hammer_unload_inode, (void *)MNT_WAIT);
 556
 557         /*
 558          * Unload & flush volumes
 559          */
 560 #endif
 561         /*
 562          * Unload buffers and then volumes
 563          */
 564         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 565                 hammer_unload_buffer, NULL);
 566         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 567                 hammer_unload_volume, NULL);
 568
 569         mp->mnt_data = NULL;
 570         mp->mnt_flag &= ~MNT_LOCAL;
 571         hmp->mp = NULL;
 572         hammer_destroy_objid_cache(hmp);
 573         kfree(hmp, M_HAMMER);
 574 }
 575
 576 /*
 577  * Obtain a vnode for the specified inode number.  An exclusively locked
 578  * vnode is returned.
 579  */
 580 int
 581 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 582 {
 583         struct hammer_transaction trans;
 584         struct hammer_mount *hmp = (void *)mp->mnt_data;
 585         struct hammer_inode *ip;
 586         int error;
 587
 588         hammer_simple_transaction(&trans, hmp);
 589
 590         /*
 591          * Lookup the requested HAMMER inode.  The structure must be
 592          * left unlocked while we manipulate the related vnode to avoid
 593          * a deadlock.
 594          */
 595         ip = hammer_get_inode(&trans, NULL, ino,
 596                               hmp->asof, HAMMER_DEF_LOCALIZATION,
 597                               0, &error);
 598         if (ip == NULL) {
 599                 *vpp = NULL;
 600                 return(error);
 601         }
 602         error = hammer_get_vnode(ip, vpp);
 603         hammer_rel_inode(ip, 0);
 604         hammer_done_transaction(&trans);
 605         return (error);
 606 }
 607
 608 /*
 609  * Return the root vnode for the filesystem.
 610  *
 611  * HAMMER stores the root vnode in the hammer_mount structure so
 612  * getting it is easy.
 613  */
 614 static int
 615 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 616 {
 617 #if 0
 618         struct hammer_mount *hmp = (void *)mp->mnt_data;
 619 #endif
 620         int error;
 621
 622         error = hammer_vfs_vget(mp, 1, vpp);
 623         return (error);
 624 }
 625
 626 static int
 627 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 628 {
 629         struct hammer_mount *hmp = (void *)mp->mnt_data;
 630         hammer_volume_t volume;
 631         hammer_volume_ondisk_t ondisk;
 632         int error;
 633         int64_t bfree;
 634
 635         volume = hammer_get_root_volume(hmp, &error);
 636         if (error)
 637                 return(error);
 638         ondisk = volume->ondisk;
 639
 640         /*
 641          * Basic stats
 642          */
 643         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 644         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 645         hammer_rel_volume(volume, 0);
 646
 647         mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE;
 648         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 649         if (mp->mnt_stat.f_files < 0)
 650                 mp->mnt_stat.f_files = 0;
 651
 652         *sbp = mp->mnt_stat;
 653         return(0);
 654 }
 655
 656 static int
 657 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 658 {
 659         struct hammer_mount *hmp = (void *)mp->mnt_data;
 660         hammer_volume_t volume;
 661         hammer_volume_ondisk_t ondisk;
 662         int error;
 663         int64_t bfree;
 664
 665         volume = hammer_get_root_volume(hmp, &error);
 666         if (error)
 667                 return(error);
 668         ondisk = volume->ondisk;
 669
 670         /*
 671          * Basic stats
 672          */
 673         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 674         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 675         hammer_rel_volume(volume, 0);
 676
 677         mp->mnt_vstat.f_bfree = bfree / HAMMER_BUFSIZE;
 678         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 679         if (mp->mnt_vstat.f_files < 0)
 680                 mp->mnt_vstat.f_files = 0;
 681         *sbp = mp->mnt_vstat;
 682         return(0);
 683 }
 684
 685 /*
 686  * Sync the filesystem.  Currently we have to run it twice, the second
 687  * one will advance the undo start index to the end index, so if a crash
 688  * occurs no undos will be run on mount.
 689  *
 690  * We do not sync the filesystem if we are called from a panic.  If we did
 691  * we might end up blowing up a sync that was already in progress.
 692  */
 693 static int
 694 hammer_vfs_sync(struct mount *mp, int waitfor)
 695 {
 696         struct hammer_mount *hmp = (void *)mp->mnt_data;
 697         int error;
 698
 699         if (panicstr == NULL) {
 700                 error = hammer_sync_hmp(hmp, waitfor);
 701                 if (error == 0)
 702                         error = hammer_sync_hmp(hmp, waitfor);
 703         } else {
 704                 error = EIO;
 705         }
 706         return (error);
 707 }
 708
 709 /*
 710  * Convert a vnode to a file handle.
 711  */
 712 static int
 713 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 714 {
 715         hammer_inode_t ip;
 716
 717         KKASSERT(MAXFIDSZ >= 16);
 718         ip = VTOI(vp);
 719         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 720         fhp->fid_reserved = 0;
 721         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 722         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 723         return(0);
 724 }
 725
 726
 727 /*
 728  * Convert a file handle back to a vnode.
 729  */
 730 static int
 731 hammer_vfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
 732 {
 733         struct hammer_transaction trans;
 734         struct hammer_inode *ip;
 735         struct hammer_inode_info info;
 736         int error;
 737
 738         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 739         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 740
 741         hammer_simple_transaction(&trans, (void *)mp->mnt_data);
 742
 743         /*
 744          * Get/allocate the hammer_inode structure.  The structure must be
 745          * unlocked while we manipulate the related vnode to avoid a
 746          * deadlock.
 747          */
 748         ip = hammer_get_inode(&trans, NULL, info.obj_id,
 749                               info.obj_asof, HAMMER_DEF_LOCALIZATION,
 750                               0, &error);
 751         if (ip == NULL) {
 752                 *vpp = NULL;
 753                 return(error);
 754         }
 755         error = hammer_get_vnode(ip, vpp);
 756         hammer_rel_inode(ip, 0);
 757         hammer_done_transaction(&trans);
 758         return (error);
 759 }
 760
 761 static int
 762 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 763                     int *exflagsp, struct ucred **credanonp)
 764 {
 765         hammer_mount_t hmp = (void *)mp->mnt_data;
 766         struct netcred *np;
 767         int error;
 768
 769         np = vfs_export_lookup(mp, &hmp->export, nam);
 770         if (np) {
 771                 *exflagsp = np->netc_exflags;
 772                 *credanonp = &np->netc_anon;
 773                 error = 0;
 774         } else {
 775                 error = EACCES;
 776         }
 777         return (error);
 778
 779 }
 780
 781 int
 782 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
 783 {
 784         hammer_mount_t hmp = (void *)mp->mnt_data;
 785         int error;
 786
 787         switch(op) {
 788         case MOUNTCTL_SET_EXPORT:
 789                 error = vfs_export(mp, &hmp->export, export);
 790                 break;
 791         default:
 792                 error = EOPNOTSUPP;
 793                 break;
 794         }
 795         return(error);
 796 }
 797