sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011, 2012 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 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/nlookup.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/buf.h>
  42 #include <sys/uuid.h>
  43 #include <sys/vfsops.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/socket.h>
  46
  47 #include "hammer2.h"
  48 #include "hammer2_disk.h"
  49 #include "hammer2_mount.h"
  50
  51 struct hammer2_sync_info {
  52         int error;
  53         int waitfor;
  54 };
  55
  56 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  57 static struct hammer2_mntlist hammer2_mntlist;
  58 static struct lock hammer2_mntlk;
  59
  60 int hammer2_debug;
  61 int hammer2_cluster_enable = 1;
  62 int hammer2_hardlink_enable = 1;
  63 long hammer2_iod_file_read;
  64 long hammer2_iod_meta_read;
  65 long hammer2_iod_indr_read;
  66 long hammer2_iod_file_write;
  67 long hammer2_iod_meta_write;
  68 long hammer2_iod_indr_write;
  69 long hammer2_iod_volu_write;
  70 long hammer2_ioa_file_read;
  71 long hammer2_ioa_meta_read;
  72 long hammer2_ioa_indr_read;
  73 long hammer2_ioa_file_write;
  74 long hammer2_ioa_meta_write;
  75 long hammer2_ioa_indr_write;
  76 long hammer2_ioa_volu_write;
  77
  78 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
  79
  80 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
  81            &hammer2_debug, 0, "");
  82 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
  83            &hammer2_cluster_enable, 0, "");
  84 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
  85            &hammer2_hardlink_enable, 0, "");
  86 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
  87            &hammer2_iod_file_read, 0, "");
  88 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
  89            &hammer2_iod_meta_read, 0, "");
  90 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
  91            &hammer2_iod_indr_read, 0, "");
  92 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
  93            &hammer2_iod_file_write, 0, "");
  94 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
  95            &hammer2_iod_meta_write, 0, "");
  96 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
  97            &hammer2_iod_indr_write, 0, "");
  98 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
  99            &hammer2_iod_volu_write, 0, "");
 100 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 101            &hammer2_ioa_file_read, 0, "");
 102 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 103            &hammer2_ioa_meta_read, 0, "");
 104 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 105            &hammer2_ioa_indr_read, 0, "");
 106 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 107            &hammer2_ioa_file_write, 0, "");
 108 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 109            &hammer2_ioa_meta_write, 0, "");
 110 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 111            &hammer2_ioa_indr_write, 0, "");
 112 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 113            &hammer2_ioa_volu_write, 0, "");
 114
 115 static int hammer2_vfs_init(struct vfsconf *conf);
 116 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 117                                 struct ucred *cred);
 118 static int hammer2_remount(struct mount *, char *, struct vnode *,
 119                                 struct ucred *);
 120 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 121 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 122 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 123                                 struct ucred *cred);
 124 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 125                                 struct ucred *cred);
 126 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 127 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 128                                 ino_t ino, struct vnode **vpp);
 129 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 130                                 struct fid *fhp, struct vnode **vpp);
 131 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 132 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 133                                 int *exflagsp, struct ucred **credanonp);
 134
 135 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 136 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
 137 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 138
 139 static int hammer2_msg_conn_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
 140 static int hammer2_msg_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
 141 static int hammer2_msg_lnk_rcvmsg(kdmsg_msg_t *msg);
 142
 143 /*
 144  * HAMMER2 vfs operations.
 145  */
 146 static struct vfsops hammer2_vfsops = {
 147         .vfs_init       = hammer2_vfs_init,
 148         .vfs_sync       = hammer2_vfs_sync,
 149         .vfs_mount      = hammer2_vfs_mount,
 150         .vfs_unmount    = hammer2_vfs_unmount,
 151         .vfs_root       = hammer2_vfs_root,
 152         .vfs_statfs     = hammer2_vfs_statfs,
 153         .vfs_statvfs    = hammer2_vfs_statvfs,
 154         .vfs_vget       = hammer2_vfs_vget,
 155         .vfs_vptofh     = hammer2_vfs_vptofh,
 156         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 157         .vfs_checkexp   = hammer2_vfs_checkexp
 158 };
 159
 160 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 161
 162 VFS_SET(hammer2_vfsops, hammer2, 0);
 163 MODULE_VERSION(hammer2, 1);
 164
 165 static
 166 int
 167 hammer2_vfs_init(struct vfsconf *conf)
 168 {
 169         int error;
 170
 171         error = 0;
 172
 173         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 174                 error = EINVAL;
 175         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 176                 error = EINVAL;
 177         if (HAMMER2_ALLOCREF_BYTES != sizeof(struct hammer2_allocref))
 178                 error = EINVAL;
 179         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 180                 error = EINVAL;
 181
 182         if (error)
 183                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 184
 185         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 186         TAILQ_INIT(&hammer2_mntlist);
 187
 188         return (error);
 189 }
 190
 191 /*
 192  * Mount or remount HAMMER2 fileystem from physical media
 193  *
 194  *      mountroot
 195  *              mp              mount point structure
 196  *              path            NULL
 197  *              data            <unused>
 198  *              cred            <unused>
 199  *
 200  *      mount
 201  *              mp              mount point structure
 202  *              path            path to mount point
 203  *              data            pointer to argument structure in user space
 204  *                      volume  volume path (device@LABEL form)
 205  *                      hflags  user mount flags
 206  *              cred            user credentials
 207  *
 208  * RETURNS:     0       Success
 209  *              !0      error number
 210  */
 211 static
 212 int
 213 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 214                   struct ucred *cred)
 215 {
 216         struct hammer2_mount_info info;
 217         hammer2_pfsmount_t *pmp;
 218         hammer2_mount_t *hmp;
 219         hammer2_key_t lhc;
 220         struct vnode *devvp;
 221         struct nlookupdata nd;
 222         hammer2_chain_t *parent;
 223         hammer2_chain_t *schain;
 224         hammer2_chain_t *rchain;
 225         struct file *fp;
 226         char devstr[MNAMELEN];
 227         size_t size;
 228         size_t done;
 229         char *dev;
 230         char *label;
 231         int ronly = 1;
 232         int create_hmp;
 233         int error;
 234
 235         hmp = NULL;
 236         pmp = NULL;
 237         dev = NULL;
 238         label = NULL;
 239         devvp = NULL;
 240
 241         kprintf("hammer2_mount\n");
 242
 243         if (path == NULL) {
 244                 /*
 245                  * Root mount
 246                  */
 247                 bzero(&info, sizeof(info));
 248                 info.cluster_fd = -1;
 249                 return (EOPNOTSUPP);
 250         } else {
 251                 /*
 252                  * Non-root mount or updating a mount
 253                  */
 254                 error = copyin(data, &info, sizeof(info));
 255                 if (error)
 256                         return (error);
 257
 258                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 259                 if (error)
 260                         return (error);
 261
 262                 /* Extract device and label */
 263                 dev = devstr;
 264                 label = strchr(devstr, '@');
 265                 if (label == NULL ||
 266                     ((label + 1) - dev) > done) {
 267                         return (EINVAL);
 268                 }
 269                 *label = '\0';
 270                 label++;
 271                 if (*label == '\0')
 272                         return (EINVAL);
 273
 274                 if (mp->mnt_flag & MNT_UPDATE) {
 275                         /* Update mount */
 276                         /* HAMMER2 implements NFS export via mountctl */
 277                         hmp = MPTOHMP(mp);
 278                         devvp = hmp->devvp;
 279                         error = hammer2_remount(mp, path, devvp, cred);
 280                         return error;
 281                 }
 282         }
 283
 284         /*
 285          * PFS mount
 286          *
 287          * Lookup name and verify it refers to a block device.
 288          */
 289         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 290         if (error == 0)
 291                 error = nlookup(&nd);
 292         if (error == 0)
 293                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 294         nlookup_done(&nd);
 295
 296         if (error == 0) {
 297                 if (vn_isdisk(devvp, &error))
 298                         error = vfs_mountedon(devvp);
 299         }
 300
 301         /*
 302          * Determine if the device has already been mounted.  After this
 303          * check hmp will be non-NULL if we are doing the second or more
 304          * hammer2 mounts from the same device.
 305          */
 306         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 307         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 308                 if (hmp->devvp == devvp)
 309                         break;
 310         }
 311
 312         /*
 313          * Open the device if this isn't a secondary mount
 314          */
 315         if (hmp) {
 316                 create_hmp = 0;
 317         } else {
 318                 create_hmp = 1;
 319                 if (error == 0 && vcount(devvp) > 0)
 320                         error = EBUSY;
 321
 322                 /*
 323                  * Now open the device
 324                  */
 325                 if (error == 0) {
 326                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 327                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 328                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 329                         if (error == 0) {
 330                                 error = VOP_OPEN(devvp,
 331                                                  ronly ? FREAD : FREAD | FWRITE,
 332                                                  FSCRED, NULL);
 333                         }
 334                         vn_unlock(devvp);
 335                 }
 336                 if (error && devvp) {
 337                         vrele(devvp);
 338                         devvp = NULL;
 339                 }
 340                 if (error) {
 341                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 342                         return error;
 343                 }
 344         }
 345
 346         /*
 347          * Block device opened successfully, finish initializing the
 348          * mount structure.
 349          *
 350          * From this point on we have to call hammer2_unmount() on failure.
 351          */
 352         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 353         mp->mnt_data = (qaddr_t)pmp;
 354         pmp->mp = mp;
 355
 356         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 357         kdmsg_iocom_init(&pmp->iocom, pmp, pmp->mmsg,
 358                          hammer2_msg_lnk_rcvmsg,
 359                          hammer2_msg_dbg_rcvmsg,
 360                          hammer2_msg_adhoc_input);
 361
 362         if (create_hmp) {
 363                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 364                 hmp->ronly = ronly;
 365                 hmp->devvp = devvp;
 366                 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
 367                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 368                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 369         }
 370         ccms_domain_init(&pmp->ccms_dom);
 371         pmp->hmp = hmp;
 372         ++hmp->pmp_count;
 373         lockmgr(&hammer2_mntlk, LK_RELEASE);
 374         kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 375
 376         mp->mnt_flag = MNT_LOCAL;
 377         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 378
 379         if (create_hmp) {
 380                 /*
 381                  * vchain setup. vchain.data is special cased to NULL.
 382                  * vchain.refs is initialized and will never drop to 0.
 383                  */
 384                 hmp->vchain.refs = 1;
 385                 hmp->vchain.data = (void *)&hmp->voldata;
 386                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 387                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 388                 hmp->vchain.bref_flush = hmp->vchain.bref;
 389                 ccms_cst_init(&hmp->vchain.cst, NULL);
 390                 /* hmp->vchain.u.xxx is left NULL */
 391                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 392                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 393
 394                 /*
 395                  * Install the volume header
 396                  */
 397                 error = hammer2_install_volume_header(hmp);
 398                 if (error) {
 399                         hammer2_vfs_unmount(mp, MNT_FORCE);
 400                         return error;
 401                 }
 402         }
 403
 404         /*
 405          * required mount structure initializations
 406          */
 407         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 408         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 409
 410         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 411         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 412
 413         /*
 414          * Optional fields
 415          */
 416         mp->mnt_iosize_max = MAXPHYS;
 417
 418         /*
 419          * First locate the super-root inode, which is key 0 relative to the
 420          * volume header's blockset.
 421          *
 422          * Then locate the root inode by scanning the directory keyspace
 423          * represented by the label.
 424          */
 425         if (create_hmp) {
 426                 parent = &hmp->vchain;
 427                 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
 428                 schain = hammer2_chain_lookup(hmp, &parent,
 429                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 430                 hammer2_chain_unlock(hmp, parent);
 431                 if (schain == NULL) {
 432                         kprintf("hammer2_mount: invalid super-root\n");
 433                         hammer2_vfs_unmount(mp, MNT_FORCE);
 434                         return EINVAL;
 435                 }
 436                 hammer2_chain_ref(hmp, schain); /* for hmp->schain */
 437                 hmp->schain = schain;           /* left locked */
 438         } else {
 439                 schain = hmp->schain;
 440                 hammer2_chain_lock(hmp, schain, HAMMER2_RESOLVE_ALWAYS);
 441         }
 442
 443         parent = schain;
 444         lhc = hammer2_dirhash(label, strlen(label));
 445         rchain = hammer2_chain_lookup(hmp, &parent,
 446                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 447                                       0);
 448         while (rchain) {
 449                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 450                     rchain->u.ip &&
 451                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 452                         break;
 453                 }
 454                 rchain = hammer2_chain_next(hmp, &parent, rchain,
 455                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 456                                             0);
 457         }
 458         hammer2_chain_unlock(hmp, parent);
 459         if (rchain == NULL) {
 460                 kprintf("hammer2_mount: PFS label not found\n");
 461                 hammer2_vfs_unmount(mp, MNT_FORCE);
 462                 return EINVAL;
 463         }
 464         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 465                 hammer2_chain_unlock(hmp, rchain);
 466                 kprintf("hammer2_mount: PFS label already mounted!\n");
 467                 hammer2_vfs_unmount(mp, MNT_FORCE);
 468                 return EBUSY;
 469         }
 470         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 471
 472         hammer2_chain_ref(hmp, rchain); /* for pmp->rchain */
 473         hammer2_chain_unlock(hmp, rchain);
 474         pmp->rchain = rchain;           /* left held & unlocked */
 475         pmp->iroot = rchain->u.ip;      /* implied hold from rchain */
 476         pmp->iroot->pmp = pmp;
 477
 478         kprintf("iroot %p\n", pmp->iroot);
 479
 480         /*
 481          * Ref the cluster management messaging descriptor.  The mount
 482          * program deals with the other end of the communications pipe.
 483          */
 484         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 485         if (fp == NULL) {
 486                 kprintf("hammer2_mount: bad cluster_fd!\n");
 487                 hammer2_vfs_unmount(mp, MNT_FORCE);
 488                 return EBADF;
 489         }
 490         hammer2_cluster_reconnect(pmp, fp);
 491
 492         /*
 493          * Finish setup
 494          */
 495         vfs_getnewfsid(mp);
 496         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 497         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 498         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 499
 500         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 501         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 502         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 503         copyinstr(path, mp->mnt_stat.f_mntonname,
 504                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 505                   &size);
 506
 507         /*
 508          * Initial statfs to prime mnt_stat.
 509          */
 510         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 511
 512         return 0;
 513 }
 514
 515 static
 516 int
 517 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 518                 struct ucred *cred)
 519 {
 520         return (0);
 521 }
 522
 523 static
 524 int
 525 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 526 {
 527         hammer2_pfsmount_t *pmp;
 528         hammer2_mount_t *hmp;
 529         int flags;
 530         int error = 0;
 531         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 532         struct vnode *devvp;
 533
 534         pmp = MPTOPMP(mp);
 535         hmp = pmp->hmp;
 536         flags = 0;
 537
 538         if (mntflags & MNT_FORCE)
 539                 flags |= FORCECLOSE;
 540
 541         hammer2_mount_exlock(hmp);
 542
 543         /*
 544          * If mount initialization proceeded far enough we must flush
 545          * its vnodes.
 546          */
 547         if (pmp->iroot)
 548                 error = vflush(mp, 0, flags);
 549
 550         if (error)
 551                 return error;
 552
 553         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 554         --hmp->pmp_count;
 555         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 556
 557         /*
 558          * Flush any left over chains.  The voldata lock is only used
 559          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 560          */
 561         hammer2_voldata_lock(hmp);
 562         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 563                                  HAMMER2_CHAIN_MODIFIED_AUX |
 564                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 565                 hammer2_voldata_unlock(hmp);
 566                 hammer2_vfs_sync(mp, MNT_WAIT);
 567         } else {
 568                 hammer2_voldata_unlock(hmp);
 569         }
 570         if (hmp->pmp_count == 0) {
 571                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 572                                          HAMMER2_CHAIN_MODIFIED_AUX |
 573                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 574                         kprintf("hammer2_unmount: chains left over after "
 575                                 "final sync\n");
 576                         if (hammer2_debug & 0x0010)
 577                                 Debugger("entered debugger");
 578                 }
 579         }
 580
 581         /*
 582          * Cleanup the root and super-root chain elements (which should be
 583          * clean).
 584          */
 585         pmp->iroot = NULL;
 586         if (pmp->rchain) {
 587                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 588                 KKASSERT(pmp->rchain->refs == 1);
 589                 hammer2_chain_drop(hmp, pmp->rchain);
 590                 pmp->rchain = NULL;
 591         }
 592         ccms_domain_uninit(&pmp->ccms_dom);
 593
 594         /*
 595          * Kill cluster controller
 596          */
 597         kdmsg_iocom_uninit(&pmp->iocom);
 598
 599         /*
 600          * If no PFS's left drop the master hammer2_mount for the device.
 601          */
 602         if (hmp->pmp_count == 0) {
 603                 if (hmp->schain) {
 604                         KKASSERT(hmp->schain->refs == 1);
 605                         hammer2_chain_drop(hmp, hmp->schain);
 606                         hmp->schain = NULL;
 607                 }
 608
 609                 /*
 610                  * Finish up with the device vnode
 611                  */
 612                 if ((devvp = hmp->devvp) != NULL) {
 613                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 614                         hmp->devvp = NULL;
 615                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 616                         vrele(devvp);
 617                         devvp = NULL;
 618                 }
 619         }
 620         hammer2_mount_unlock(hmp);
 621
 622         pmp->mp = NULL;
 623         pmp->hmp = NULL;
 624         mp->mnt_data = NULL;
 625
 626         kmalloc_destroy(&pmp->mmsg);
 627
 628         kfree(pmp, M_HAMMER2);
 629         if (hmp->pmp_count == 0) {
 630                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 631                 kmalloc_destroy(&hmp->minode);
 632                 kmalloc_destroy(&hmp->mchain);
 633                 kfree(hmp, M_HAMMER2);
 634         }
 635         lockmgr(&hammer2_mntlk, LK_RELEASE);
 636         return (error);
 637 }
 638
 639 static
 640 int
 641 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 642              ino_t ino, struct vnode **vpp)
 643 {
 644         kprintf("hammer2_vget\n");
 645         return (EOPNOTSUPP);
 646 }
 647
 648 static
 649 int
 650 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 651 {
 652         hammer2_pfsmount_t *pmp;
 653         hammer2_mount_t *hmp;
 654         int error;
 655         struct vnode *vp;
 656
 657         pmp = MPTOPMP(mp);
 658         hmp = pmp->hmp;
 659         hammer2_mount_exlock(hmp);
 660         if (pmp->iroot == NULL) {
 661                 *vpp = NULL;
 662                 error = EINVAL;
 663         } else {
 664                 hammer2_chain_lock(hmp, &pmp->iroot->chain,
 665                                    HAMMER2_RESOLVE_ALWAYS |
 666                                    HAMMER2_RESOLVE_SHARED);
 667                 vp = hammer2_igetv(pmp->iroot, &error);
 668                 hammer2_chain_unlock(hmp, &pmp->iroot->chain);
 669                 *vpp = vp;
 670                 if (vp == NULL)
 671                         kprintf("vnodefail\n");
 672         }
 673         hammer2_mount_unlock(hmp);
 674
 675         return (error);
 676 }
 677
 678 /*
 679  * Filesystem status
 680  *
 681  * XXX incorporate pmp->iroot->ip_data.inode_quota and data_quota
 682  */
 683 static
 684 int
 685 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 686 {
 687         hammer2_pfsmount_t *pmp;
 688         hammer2_mount_t *hmp;
 689
 690         pmp = MPTOPMP(mp);
 691         hmp = MPTOHMP(mp);
 692
 693         mp->mnt_stat.f_files = pmp->iroot->ip_data.inode_count +
 694                                pmp->iroot->delta_icount;
 695         mp->mnt_stat.f_ffree = 0;
 696         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 697         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 698                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 699         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 700
 701         *sbp = mp->mnt_stat;
 702         return (0);
 703 }
 704
 705 static
 706 int
 707 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 708 {
 709         hammer2_pfsmount_t *pmp;
 710         hammer2_mount_t *hmp;
 711
 712         pmp = MPTOPMP(mp);
 713         hmp = MPTOHMP(mp);
 714
 715         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 716         mp->mnt_vstat.f_files = pmp->iroot->ip_data.inode_count +
 717                                 pmp->iroot->delta_icount;
 718         mp->mnt_vstat.f_ffree = 0;
 719         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 720         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 721                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 722         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 723
 724         *sbp = mp->mnt_vstat;
 725         return (0);
 726 }
 727
 728 /*
 729  * Sync the entire filesystem; this is called from the filesystem syncer
 730  * process periodically and whenever a user calls sync(1) on the hammer
 731  * mountpoint.
 732  *
 733  * Currently is actually called from the syncer! \o/
 734  *
 735  * This task will have to snapshot the state of the dirty inode chain.
 736  * From that, it will have to make sure all of the inodes on the dirty
 737  * chain have IO initiated. We make sure that io is initiated for the root
 738  * block.
 739  *
 740  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 741  *
 742  * THINKS: side A vs side B, to have sync not stall all I/O?
 743  */
 744 static
 745 int
 746 hammer2_vfs_sync(struct mount *mp, int waitfor)
 747 {
 748         struct hammer2_sync_info info;
 749         hammer2_mount_t *hmp;
 750         int flags;
 751         int error;
 752         int haswork;
 753
 754         hmp = MPTOHMP(mp);
 755
 756         flags = VMSC_GETVP;
 757         if (waitfor & MNT_LAZY)
 758                 flags |= VMSC_ONEPASS;
 759
 760         info.error = 0;
 761         info.waitfor = MNT_NOWAIT;
 762         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 763                       hammer2_sync_scan1,
 764                       hammer2_sync_scan2, &info);
 765         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 766                 info.waitfor = waitfor;
 767                     vmntvnodescan(mp, flags,
 768                                   hammer2_sync_scan1,
 769                                   hammer2_sync_scan2, &info);
 770
 771         }
 772 #if 0
 773         if (waitfor == MNT_WAIT) {
 774                 /* XXX */
 775         } else {
 776                 /* XXX */
 777         }
 778 #endif
 779         hammer2_chain_lock(hmp, &hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 780         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 781                                  HAMMER2_CHAIN_MODIFIED_AUX |
 782                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 783                 hammer2_chain_flush(hmp, &hmp->vchain, 0);
 784                 haswork = 1;
 785         } else {
 786                 haswork = 0;
 787         }
 788         hammer2_chain_unlock(hmp, &hmp->vchain);
 789
 790         error = 0;
 791
 792         if ((waitfor & MNT_LAZY) == 0) {
 793                 waitfor = MNT_NOWAIT;
 794                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 795                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 796                 vn_unlock(hmp->devvp);
 797         }
 798
 799         if (error == 0 && haswork) {
 800                 struct buf *bp;
 801
 802                 /*
 803                  * Synchronize the disk before flushing the volume
 804                  * header.
 805                  */
 806                 bp = getpbuf(NULL);
 807                 bp->b_bio1.bio_offset = 0;
 808                 bp->b_bufsize = 0;
 809                 bp->b_bcount = 0;
 810                 bp->b_cmd = BUF_CMD_FLUSH;
 811                 bp->b_bio1.bio_done = biodone_sync;
 812                 bp->b_bio1.bio_flags |= BIO_SYNC;
 813                 vn_strategy(hmp->devvp, &bp->b_bio1);
 814                 biowait(&bp->b_bio1, "h2vol");
 815                 relpbuf(bp, NULL);
 816
 817                 /*
 818                  * Then we can safely flush the volume header.  Volume
 819                  * data is locked separately to prevent ioctl functions
 820                  * from deadlocking due to a configuration issue.
 821                  */
 822                 bp = getblk(hmp->devvp, 0, HAMMER2_PBUFSIZE, 0, 0);
 823                 hammer2_voldata_lock(hmp);
 824                 bcopy(&hmp->voldata, bp->b_data, HAMMER2_PBUFSIZE);
 825                 hammer2_voldata_unlock(hmp);
 826                 bawrite(bp);
 827         }
 828         return (error);
 829 }
 830
 831 /*
 832  * Sync passes.
 833  *
 834  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 835  *       won't flush on those flags.  The syncer code above will do a
 836  *       general meta-data flush globally that will catch these flags.
 837  */
 838 static int
 839 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 840 {
 841         hammer2_inode_t *ip;
 842
 843         ip = VTOI(vp);
 844         if (vp->v_type == VNON || ip == NULL ||
 845             ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
 846                                  HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
 847              RB_EMPTY(&vp->v_rbdirty_tree))) {
 848                 return(-1);
 849         }
 850         return(0);
 851 }
 852
 853 static int
 854 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 855 {
 856         struct hammer2_sync_info *info = data;
 857         hammer2_inode_t *ip;
 858         int error;
 859
 860         ip = VTOI(vp);
 861         if (vp->v_type == VNON || vp->v_type == VBAD ||
 862             ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
 863                                  HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
 864             RB_EMPTY(&vp->v_rbdirty_tree))) {
 865                 return(0);
 866         }
 867         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 868         if (error)
 869                 info->error = error;
 870         return(0);
 871 }
 872
 873 static
 874 int
 875 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 876 {
 877         return (0);
 878 }
 879
 880 static
 881 int
 882 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 883                struct fid *fhp, struct vnode **vpp)
 884 {
 885         return (0);
 886 }
 887
 888 static
 889 int
 890 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 891                  int *exflagsp, struct ucred **credanonp)
 892 {
 893         return (0);
 894 }
 895
 896 /*
 897  * Support code for hammer2_mount().  Read, verify, and install the volume
 898  * header into the HMP
 899  *
 900  * XXX read four volhdrs and use the one with the highest TID whos CRC
 901  *     matches.
 902  *
 903  * XXX check iCRCs.
 904  *
 905  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
 906  *     nonexistant locations.
 907  *
 908  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
 909  */
 910 static
 911 int
 912 hammer2_install_volume_header(hammer2_mount_t *hmp)
 913 {
 914         hammer2_volume_data_t *vd;
 915         struct buf *bp;
 916         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
 917         int error_reported;
 918         int error;
 919         int valid;
 920         int i;
 921
 922         error_reported = 0;
 923         error = 0;
 924         valid = 0;
 925         bp = NULL;
 926
 927         /*
 928          * There are up to 4 copies of the volume header (syncs iterate
 929          * between them so there is no single master).  We don't trust the
 930          * volu_size field so we don't know precisely how large the filesystem
 931          * is, so depend on the OS to return an error if we go beyond the
 932          * block device's EOF.
 933          */
 934         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
 935                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 936                               HAMMER2_VOLUME_BYTES, &bp);
 937                 if (error) {
 938                         brelse(bp);
 939                         bp = NULL;
 940                         continue;
 941                 }
 942
 943                 vd = (struct hammer2_volume_data *) bp->b_data;
 944                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
 945                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
 946                         brelse(bp);
 947                         bp = NULL;
 948                         continue;
 949                 }
 950
 951                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
 952                         /* XXX: Reversed-endianness filesystem */
 953                         kprintf("hammer2: reverse-endian filesystem detected");
 954                         brelse(bp);
 955                         bp = NULL;
 956                         continue;
 957                 }
 958
 959                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
 960                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
 961                                       HAMMER2_VOLUME_ICRC0_SIZE);
 962                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
 963                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
 964                                        HAMMER2_VOLUME_ICRC1_SIZE);
 965                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
 966                         kprintf("hammer2 volume header crc "
 967                                 "mismatch copy #%d\t%08x %08x",
 968                                 i, crc0, crc);
 969                         error_reported = 1;
 970                         brelse(bp);
 971                         bp = NULL;
 972                         continue;
 973                 }
 974                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
 975                         valid = 1;
 976                         hmp->voldata = *vd;
 977                 }
 978                 brelse(bp);
 979                 bp = NULL;
 980         }
 981         if (valid) {
 982                 error = 0;
 983                 if (error_reported)
 984                         kprintf("hammer2: a valid volume header was found\n");
 985         } else {
 986                 error = EINVAL;
 987                 kprintf("hammer2: no valid volume headers found!\n");
 988         }
 989         return (error);
 990 }
 991
 992 /*
 993  * Reconnect using the passed file pointer.  The caller must ref the
 994  * fp for us.
 995  */
 996 void
 997 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
 998 {
 999         kdmsg_msg_t *msg;
1000         size_t name_len;
1001
1002         /*
1003          * Closes old comm descriptor, kills threads, cleans up
1004          * states, then installs the new descriptor and creates
1005          * new threads.
1006          */
1007         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1008
1009         /*
1010          * Open a LNK_CONN transaction indicating that we want to take part
1011          * in the spanning tree algorithm.  Filter explicitly on the PFS
1012          * info in the iroot.
1013          *
1014          * We do not transmit our (only) LNK_SPAN until the other end has
1015          * acknowledged our link connection request.
1016          *
1017          * The transaction remains fully open for the duration of the
1018          * connection.
1019          */
1020         msg = kdmsg_msg_alloc(&pmp->iocom.router, DMSG_LNK_CONN | DMSGF_CREATE,
1021                                 hammer2_msg_conn_reply, pmp);
1022         msg->any.lnk_conn.pfs_clid = pmp->iroot->ip_data.pfs_clid;
1023         msg->any.lnk_conn.pfs_fsid = pmp->iroot->ip_data.pfs_fsid;
1024         msg->any.lnk_conn.pfs_type = pmp->iroot->ip_data.pfs_type;
1025         msg->any.lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1026         msg->any.lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1027         msg->any.lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1028         name_len = pmp->iroot->ip_data.name_len;
1029         if (name_len >= sizeof(msg->any.lnk_conn.fs_label))
1030                 name_len = sizeof(msg->any.lnk_conn.fs_label) - 1;
1031         bcopy(pmp->iroot->ip_data.filename,
1032               msg->any.lnk_conn.fs_label,
1033               name_len);
1034         pmp->iocom.conn_state = msg->state;
1035         msg->any.lnk_conn.fs_label[name_len] = 0;
1036         kdmsg_msg_write(msg);
1037 }
1038
1039 static int
1040 hammer2_msg_lnk_rcvmsg(kdmsg_msg_t *msg)
1041 {
1042         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1043         case DMSG_LNK_CONN | DMSGF_CREATE:
1044                 /*
1045                  * connection request from peer, send a streaming
1046                  * result of 0 (leave the transaction open).  Transaction
1047                  * is left open for the duration of the connection, we
1048                  * let the kern_dmsg module clean it up on disconnect.
1049                  */
1050                 kdmsg_msg_result(msg, 0);
1051                 break;
1052         case DMSG_LNK_SPAN | DMSGF_CREATE:
1053                 /*
1054                  * Incoming SPAN - transaction create
1055                  *
1056                  * We do not have to respond right now.  Instead we will
1057                  * respond later on when the peer deletes their side.
1058                  */
1059                 break;
1060         case DMSG_LNK_SPAN | DMSGF_DELETE:
1061                 /*
1062                  * Incoming SPAN - transaction delete.
1063                  *
1064                  * We must terminate our side so both ends can free up
1065                  * their recorded state.
1066                  */
1067                 /* fall through */
1068         case DMSG_LNK_SPAN | DMSGF_CREATE | DMSGF_DELETE:
1069                 /*
1070                  * Incoming SPAN - transaction delete (degenerate span).
1071                  *
1072                  * We must terminate our side so both ends can free up
1073                  * their recorded state.
1074                  */
1075                 kdmsg_msg_reply(msg, 0);
1076                 break;
1077         default:
1078                 /*
1079                  * Unsupported LNK message received.  We only need to
1080                  * reply if it's a transaction in order to close our end.
1081                  * Ignore any one-way messages are any further messages
1082                  * associated with the transaction.
1083                  *
1084                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1085                  *       which might be one-way, replying to those would
1086                  *       cause an infinite ping-pong.
1087                  */
1088                 if (msg->any.head.cmd & DMSGF_CREATE)
1089                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1090                 break;
1091         }
1092         return(0);
1093 }
1094
1095 /*
1096  * This function is called when the other end replies to our LNK_CONN
1097  * request.
1098  *
1099  * We transmit our (single) SPAN on the initial reply, leaving that
1100  * transaction open too.
1101  */
1102 static int
1103 hammer2_msg_conn_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
1104 {
1105         hammer2_pfsmount_t *pmp = state->any.pmp;
1106         hammer2_mount_t *hmp = pmp->hmp;
1107         kdmsg_msg_t *rmsg;
1108         size_t name_len;
1109         int copyid;
1110
1111         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1112
1113         if (msg->any.head.cmd & DMSGF_CREATE) {
1114                 kprintf("LNK_CONN transaction replied to, initiate SPAN\n");
1115                 rmsg = kdmsg_msg_alloc(&pmp->iocom.router,
1116                                        DMSG_LNK_SPAN | DMSGF_CREATE,
1117                                        hammer2_msg_span_reply, pmp);
1118                 rmsg->any.lnk_span.pfs_clid = pmp->iroot->ip_data.pfs_clid;
1119                 rmsg->any.lnk_span.pfs_fsid = pmp->iroot->ip_data.pfs_fsid;
1120                 rmsg->any.lnk_span.pfs_type = pmp->iroot->ip_data.pfs_type;
1121                 rmsg->any.lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1122                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1123                 name_len = pmp->iroot->ip_data.name_len;
1124                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
1125                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
1126                 bcopy(pmp->iroot->ip_data.filename,
1127                       rmsg->any.lnk_span.fs_label,
1128                       name_len);
1129                 rmsg->any.lnk_span.fs_label[name_len] = 0;
1130                 kdmsg_msg_write(rmsg);
1131
1132                 /*
1133                  * Dump the configuration stored in the volume header
1134                  */
1135                 hammer2_voldata_lock(hmp);
1136                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1137                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1138                                 continue;
1139                         hammer2_volconf_update(pmp, copyid);
1140                 }
1141                 hammer2_voldata_unlock(hmp);
1142         }
1143         if ((state->txcmd & DMSGF_DELETE) == 0 &&
1144             (msg->any.head.cmd & DMSGF_DELETE)) {
1145                 kprintf("LNK_CONN transaction terminated by remote\n");
1146                 pmp->iocom.conn_state = NULL;
1147                 kdmsg_msg_reply(msg, 0);
1148         }
1149         return(0);
1150 }
1151
1152 /*
1153  * Remote terminated our span transaction.  We have to terminate our side.
1154  */
1155 static int
1156 hammer2_msg_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
1157 {
1158         /*hammer2_pfsmount_t *pmp = state->any.pmp;*/
1159
1160         kprintf("SPAN REPLY - Our sent span was terminated by the "
1161                 "remote %08x state %p\n", msg->any.head.cmd, state);
1162         if ((state->txcmd & DMSGF_DELETE) == 0 &&
1163             (msg->any.head.cmd & DMSGF_DELETE)) {
1164                 kdmsg_msg_reply(msg, 0);
1165         }
1166         return(0);
1167 }
1168
1169 /*
1170  * Volume configuration updates are passed onto the userland service
1171  * daemon via the open LNK_CONN transaction.
1172  */
1173 void
1174 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1175 {
1176         hammer2_mount_t *hmp = pmp->hmp;
1177         kdmsg_msg_t *msg;
1178
1179         /* XXX interlock against connection state termination */
1180         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1181         if (pmp->iocom.conn_state) {
1182                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1183                 msg = kdmsg_msg_alloc(&pmp->iocom.router, DMSG_LNK_VOLCONF,
1184                                         NULL, NULL);
1185                 msg->state = pmp->iocom.conn_state;
1186                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1187                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1188                 msg->any.lnk_volconf.index = index;
1189                 kdmsg_msg_write(msg);
1190         }
1191 }