sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011-2013 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 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  52
  53 struct hammer2_sync_info {
  54         hammer2_trans_t trans;
  55         int error;
  56         int waitfor;
  57 };
  58
  59 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  60 static struct hammer2_mntlist hammer2_mntlist;
  61 static struct lock hammer2_mntlk;
  62
  63 int hammer2_debug;
  64 int hammer2_cluster_enable = 1;
  65 int hammer2_hardlink_enable = 1;
  66 long hammer2_iod_file_read;
  67 long hammer2_iod_meta_read;
  68 long hammer2_iod_indr_read;
  69 long hammer2_iod_file_write;
  70 long hammer2_iod_meta_write;
  71 long hammer2_iod_indr_write;
  72 long hammer2_iod_fmap_write;
  73 long hammer2_iod_volu_write;
  74 long hammer2_ioa_file_read;
  75 long hammer2_ioa_meta_read;
  76 long hammer2_ioa_indr_read;
  77 long hammer2_ioa_fmap_write;
  78 long hammer2_ioa_file_write;
  79 long hammer2_ioa_meta_write;
  80 long hammer2_ioa_indr_write;
  81 long hammer2_ioa_volu_write;
  82
  83 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
  84
  85 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
  86            &hammer2_debug, 0, "");
  87 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
  88            &hammer2_cluster_enable, 0, "");
  89 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
  90            &hammer2_hardlink_enable, 0, "");
  91 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
  92            &hammer2_iod_file_read, 0, "");
  93 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
  94            &hammer2_iod_meta_read, 0, "");
  95 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
  96            &hammer2_iod_indr_read, 0, "");
  97 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
  98            &hammer2_iod_file_write, 0, "");
  99 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 100            &hammer2_iod_meta_write, 0, "");
 101 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 102            &hammer2_iod_indr_write, 0, "");
 103 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 104            &hammer2_iod_volu_write, 0, "");
 105 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 106            &hammer2_ioa_file_read, 0, "");
 107 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 108            &hammer2_ioa_meta_read, 0, "");
 109 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 110            &hammer2_ioa_indr_read, 0, "");
 111 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 112            &hammer2_ioa_file_write, 0, "");
 113 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 114            &hammer2_ioa_meta_write, 0, "");
 115 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 116            &hammer2_ioa_indr_write, 0, "");
 117 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 118            &hammer2_ioa_volu_write, 0, "");
 119
 120 static int hammer2_vfs_init(struct vfsconf *conf);
 121 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 122                                 struct ucred *cred);
 123 static int hammer2_remount(struct mount *, char *, struct vnode *,
 124                                 struct ucred *);
 125 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 126 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 127 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 128                                 struct ucred *cred);
 129 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 130                                 struct ucred *cred);
 131 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 132 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 133                                 ino_t ino, struct vnode **vpp);
 134 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 135                                 struct fid *fhp, struct vnode **vpp);
 136 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 137 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 138                                 int *exflagsp, struct ucred **credanonp);
 139
 140 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 141 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
 142 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 143
 144 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 145 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 146
 147 /*
 148  * HAMMER2 vfs operations.
 149  */
 150 static struct vfsops hammer2_vfsops = {
 151         .vfs_init       = hammer2_vfs_init,
 152         .vfs_sync       = hammer2_vfs_sync,
 153         .vfs_mount      = hammer2_vfs_mount,
 154         .vfs_unmount    = hammer2_vfs_unmount,
 155         .vfs_root       = hammer2_vfs_root,
 156         .vfs_statfs     = hammer2_vfs_statfs,
 157         .vfs_statvfs    = hammer2_vfs_statvfs,
 158         .vfs_vget       = hammer2_vfs_vget,
 159         .vfs_vptofh     = hammer2_vfs_vptofh,
 160         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 161         .vfs_checkexp   = hammer2_vfs_checkexp
 162 };
 163
 164 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 165
 166 VFS_SET(hammer2_vfsops, hammer2, 0);
 167 MODULE_VERSION(hammer2, 1);
 168
 169 static
 170 int
 171 hammer2_vfs_init(struct vfsconf *conf)
 172 {
 173         int error;
 174
 175         error = 0;
 176
 177         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 178                 error = EINVAL;
 179         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 180                 error = EINVAL;
 181         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 182                 error = EINVAL;
 183
 184         if (error)
 185                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 186
 187         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 188         TAILQ_INIT(&hammer2_mntlist);
 189
 190         return (error);
 191 }
 192
 193 /*
 194  * Mount or remount HAMMER2 fileystem from physical media
 195  *
 196  *      mountroot
 197  *              mp              mount point structure
 198  *              path            NULL
 199  *              data            <unused>
 200  *              cred            <unused>
 201  *
 202  *      mount
 203  *              mp              mount point structure
 204  *              path            path to mount point
 205  *              data            pointer to argument structure in user space
 206  *                      volume  volume path (device@LABEL form)
 207  *                      hflags  user mount flags
 208  *              cred            user credentials
 209  *
 210  * RETURNS:     0       Success
 211  *              !0      error number
 212  */
 213 static
 214 int
 215 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 216                   struct ucred *cred)
 217 {
 218         struct hammer2_mount_info info;
 219         hammer2_pfsmount_t *pmp;
 220         hammer2_mount_t *hmp;
 221         hammer2_key_t lhc;
 222         struct vnode *devvp;
 223         struct nlookupdata nd;
 224         hammer2_chain_t *parent;
 225         hammer2_chain_t *schain;
 226         hammer2_chain_t *rchain;
 227         struct file *fp;
 228         char devstr[MNAMELEN];
 229         size_t size;
 230         size_t done;
 231         char *dev;
 232         char *label;
 233         int ronly = 1;
 234         int create_hmp;
 235         int error;
 236
 237         hmp = NULL;
 238         pmp = NULL;
 239         dev = NULL;
 240         label = NULL;
 241         devvp = NULL;
 242
 243         kprintf("hammer2_mount\n");
 244
 245         if (path == NULL) {
 246                 /*
 247                  * Root mount
 248                  */
 249                 bzero(&info, sizeof(info));
 250                 info.cluster_fd = -1;
 251                 return (EOPNOTSUPP);
 252         } else {
 253                 /*
 254                  * Non-root mount or updating a mount
 255                  */
 256                 error = copyin(data, &info, sizeof(info));
 257                 if (error)
 258                         return (error);
 259
 260                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 261                 if (error)
 262                         return (error);
 263
 264                 /* Extract device and label */
 265                 dev = devstr;
 266                 label = strchr(devstr, '@');
 267                 if (label == NULL ||
 268                     ((label + 1) - dev) > done) {
 269                         return (EINVAL);
 270                 }
 271                 *label = '\0';
 272                 label++;
 273                 if (*label == '\0')
 274                         return (EINVAL);
 275
 276                 if (mp->mnt_flag & MNT_UPDATE) {
 277                         /* Update mount */
 278                         /* HAMMER2 implements NFS export via mountctl */
 279                         hmp = MPTOHMP(mp);
 280                         devvp = hmp->devvp;
 281                         error = hammer2_remount(mp, path, devvp, cred);
 282                         return error;
 283                 }
 284         }
 285
 286         /*
 287          * PFS mount
 288          *
 289          * Lookup name and verify it refers to a block device.
 290          */
 291         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 292         if (error == 0)
 293                 error = nlookup(&nd);
 294         if (error == 0)
 295                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 296         nlookup_done(&nd);
 297
 298         if (error == 0) {
 299                 if (vn_isdisk(devvp, &error))
 300                         error = vfs_mountedon(devvp);
 301         }
 302
 303         /*
 304          * Determine if the device has already been mounted.  After this
 305          * check hmp will be non-NULL if we are doing the second or more
 306          * hammer2 mounts from the same device.
 307          */
 308         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 309         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 310                 if (hmp->devvp == devvp)
 311                         break;
 312         }
 313
 314         /*
 315          * Open the device if this isn't a secondary mount
 316          */
 317         if (hmp) {
 318                 create_hmp = 0;
 319         } else {
 320                 create_hmp = 1;
 321                 if (error == 0 && vcount(devvp) > 0)
 322                         error = EBUSY;
 323
 324                 /*
 325                  * Now open the device
 326                  */
 327                 if (error == 0) {
 328                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 329                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 330                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 331                         if (error == 0) {
 332                                 error = VOP_OPEN(devvp,
 333                                                  ronly ? FREAD : FREAD | FWRITE,
 334                                                  FSCRED, NULL);
 335                         }
 336                         vn_unlock(devvp);
 337                 }
 338                 if (error && devvp) {
 339                         vrele(devvp);
 340                         devvp = NULL;
 341                 }
 342                 if (error) {
 343                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 344                         return error;
 345                 }
 346         }
 347
 348         /*
 349          * Block device opened successfully, finish initializing the
 350          * mount structure.
 351          *
 352          * From this point on we have to call hammer2_unmount() on failure.
 353          */
 354         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 355         mp->mnt_data = (qaddr_t)pmp;
 356         pmp->mp = mp;
 357
 358         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 359         kdmsg_iocom_init(&pmp->iocom, pmp,
 360                          KDMSG_IOCOMF_AUTOCONN |
 361                          KDMSG_IOCOMF_AUTOSPAN |
 362                          KDMSG_IOCOMF_AUTOCIRC,
 363                          pmp->mmsg, hammer2_rcvdmsg);
 364
 365         if (create_hmp) {
 366                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 367                 hmp->ronly = ronly;
 368                 hmp->devvp = devvp;
 369                 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
 370                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 371                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 372         }
 373         ccms_domain_init(&pmp->ccms_dom);
 374         pmp->hmp = hmp;
 375         ++hmp->pmp_count;
 376         lockmgr(&hammer2_mntlk, LK_RELEASE);
 377         kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 378
 379         mp->mnt_flag = MNT_LOCAL;
 380         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 381
 382         if (create_hmp) {
 383                 /*
 384                  * Presetup
 385                  */
 386                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 387                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 388
 389                 /*
 390                  * vchain setup. vchain.data is special cased to NULL.
 391                  * vchain.refs is initialized and will never drop to 0.
 392                  */
 393                 hmp->vchain.hmp = hmp;
 394                 hmp->vchain.refs = 1;
 395                 hmp->vchain.data = (void *)&hmp->voldata;
 396                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 397                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 398                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 399                 /* hmp->vchain.u.xxx is left NULL */
 400
 401                 /*
 402                  * Install the volume header
 403                  */
 404                 error = hammer2_install_volume_header(hmp);
 405                 if (error) {
 406                         hammer2_vfs_unmount(mp, MNT_FORCE);
 407                         return error;
 408                 }
 409         }
 410
 411         /*
 412          * required mount structure initializations
 413          */
 414         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 415         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 416
 417         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 418         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 419
 420         /*
 421          * Optional fields
 422          */
 423         mp->mnt_iosize_max = MAXPHYS;
 424
 425         /*
 426          * First locate the super-root inode, which is key 0 relative to the
 427          * volume header's blockset.
 428          *
 429          * Then locate the root inode by scanning the directory keyspace
 430          * represented by the label.
 431          */
 432         if (create_hmp) {
 433                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 434                 schain = hammer2_chain_lookup(&parent,
 435                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 436                 hammer2_chain_lookup_done(parent);
 437                 if (schain == NULL) {
 438                         kprintf("hammer2_mount: invalid super-root\n");
 439                         hammer2_vfs_unmount(mp, MNT_FORCE);
 440                         return EINVAL;
 441                 }
 442                 hammer2_chain_ref(schain);      /* for hmp->schain */
 443                 hmp->schain = schain;           /* left locked for inode_get */
 444                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 445                 hammer2_inode_ref(hmp->sroot);       /* for hmp->sroot */
 446                 hammer2_inode_unlock_ex(hmp->sroot); /* eats schain lock */
 447         } else {
 448                 schain = hmp->schain;
 449         }
 450
 451         /*
 452          * schain only has 1 ref now for its hmp->schain assignment.
 453          * Setup for lookup (which will lock it).
 454          */
 455         parent = hammer2_chain_lookup_init(schain, 0);
 456         lhc = hammer2_dirhash(label, strlen(label));
 457         rchain = hammer2_chain_lookup(&parent,
 458                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 459                                       0);
 460         while (rchain) {
 461                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 462                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 463                         break;
 464                 }
 465                 rchain = hammer2_chain_next(&parent, rchain,
 466                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 467                                             0);
 468         }
 469         hammer2_chain_lookup_done(parent);
 470         if (rchain == NULL) {
 471                 kprintf("hammer2_mount: PFS label not found\n");
 472                 hammer2_vfs_unmount(mp, MNT_FORCE);
 473                 return EINVAL;
 474         }
 475         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 476                 hammer2_chain_unlock(rchain);
 477                 kprintf("hammer2_mount: PFS label already mounted!\n");
 478                 hammer2_vfs_unmount(mp, MNT_FORCE);
 479                 return EBUSY;
 480         }
 481         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 482
 483         /*
 484          * NOTE: *_get() integrates chain's lock into the inode lock.
 485          */
 486         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 487         pmp->rchain = rchain;                   /* left held & unlocked */
 488         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 489         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 490         hammer2_inode_unlock_ex(pmp->iroot);    /* iroot & its chain */
 491
 492         kprintf("iroot %p\n", pmp->iroot);
 493
 494         /*
 495          * Ref the cluster management messaging descriptor.  The mount
 496          * program deals with the other end of the communications pipe.
 497          */
 498         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 499         if (fp == NULL) {
 500                 kprintf("hammer2_mount: bad cluster_fd!\n");
 501                 hammer2_vfs_unmount(mp, MNT_FORCE);
 502                 return EBADF;
 503         }
 504         hammer2_cluster_reconnect(pmp, fp);
 505
 506         /*
 507          * Finish setup
 508          */
 509         vfs_getnewfsid(mp);
 510         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 511         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 512         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 513
 514         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 515         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 516         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 517         copyinstr(path, mp->mnt_stat.f_mntonname,
 518                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 519                   &size);
 520
 521         /*
 522          * Initial statfs to prime mnt_stat.
 523          */
 524         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 525
 526         return 0;
 527 }
 528
 529 static
 530 int
 531 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 532                 struct ucred *cred)
 533 {
 534         return (0);
 535 }
 536
 537 static
 538 int
 539 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 540 {
 541         hammer2_pfsmount_t *pmp;
 542         hammer2_mount_t *hmp;
 543         int flags;
 544         int error = 0;
 545         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 546         struct vnode *devvp;
 547
 548         pmp = MPTOPMP(mp);
 549         hmp = pmp->hmp;
 550         flags = 0;
 551
 552         if (mntflags & MNT_FORCE)
 553                 flags |= FORCECLOSE;
 554
 555         hammer2_mount_exlock(hmp);
 556
 557         /*
 558          * If mount initialization proceeded far enough we must flush
 559          * its vnodes.
 560          */
 561         if (pmp->iroot)
 562                 error = vflush(mp, 0, flags);
 563
 564         if (error)
 565                 return error;
 566
 567         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 568         --hmp->pmp_count;
 569         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 570
 571         /*
 572          * Flush any left over chains.  The voldata lock is only used
 573          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 574          */
 575         hammer2_voldata_lock(hmp);
 576         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 577                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 578                 hammer2_voldata_unlock(hmp, 0);
 579                 hammer2_vfs_sync(mp, MNT_WAIT);
 580         } else {
 581                 hammer2_voldata_unlock(hmp, 0);
 582         }
 583         if (hmp->pmp_count == 0) {
 584                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 585                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 586                         kprintf("hammer2_unmount: chains left over after "
 587                                 "final sync\n");
 588                         if (hammer2_debug & 0x0010)
 589                                 Debugger("entered debugger");
 590                 }
 591         }
 592
 593         /*
 594          * Cleanup the root and super-root chain elements (which should be
 595          * clean).
 596          */
 597         if (pmp->iroot) {
 598                 hammer2_inode_lock_ex(pmp->iroot);
 599                 hammer2_inode_put(pmp->iroot);
 600                 /* lock destroyed by the put */
 601 #if REPORT_REFS_ERRORS
 602                 if (pmp->iroot->refs != 1)
 603                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 604                                 pmp->iroot, pmp->iroot->refs);
 605 #else
 606                 KKASSERT(pmp->iroot->refs == 1);
 607 #endif
 608                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 609                 pmp->iroot = NULL;
 610         }
 611         if (pmp->rchain) {
 612                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 613 #if REPORT_REFS_ERRORS
 614                 if (pmp->rchain->refs != 1)
 615                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 616                                 pmp->rchain, pmp->rchain->refs);
 617 #else
 618                 KKASSERT(pmp->rchain->refs == 1);
 619 #endif
 620                 hammer2_chain_drop(pmp->rchain);
 621                 pmp->rchain = NULL;
 622         }
 623         ccms_domain_uninit(&pmp->ccms_dom);
 624
 625         /*
 626          * Kill cluster controller
 627          */
 628         kdmsg_iocom_uninit(&pmp->iocom);
 629
 630         /*
 631          * If no PFS's left drop the master hammer2_mount for the device.
 632          */
 633         if (hmp->pmp_count == 0) {
 634                 if (hmp->sroot) {
 635                         hammer2_inode_drop(hmp->sroot);
 636                         hmp->sroot = NULL;
 637                 }
 638                 if (hmp->schain) {
 639 #if REPORT_REFS_ERRORS
 640                         if (hmp->schain->refs != 1)
 641                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 642                                         hmp->schain, hmp->schain->refs);
 643 #else
 644                         KKASSERT(hmp->schain->refs == 1);
 645 #endif
 646                         hammer2_chain_drop(hmp->schain);
 647                         hmp->schain = NULL;
 648                 }
 649
 650                 /*
 651                  * Finish up with the device vnode
 652                  */
 653                 if ((devvp = hmp->devvp) != NULL) {
 654                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 655                         hmp->devvp = NULL;
 656                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 657                         vrele(devvp);
 658                         devvp = NULL;
 659                 }
 660         }
 661         hammer2_mount_unlock(hmp);
 662
 663         /*
 664          * Final drop of embedded volume root chain to clean up
 665          * vchain.core (vchain structure is not flagged ALLOCATED
 666          * so it is cleaned out and then left).
 667          */
 668         hammer2_chain_drop(&hmp->vchain);
 669
 670         pmp->mp = NULL;
 671         pmp->hmp = NULL;
 672         mp->mnt_data = NULL;
 673
 674         kmalloc_destroy(&pmp->mmsg);
 675
 676         kfree(pmp, M_HAMMER2);
 677         if (hmp->pmp_count == 0) {
 678                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 679                 kmalloc_destroy(&hmp->minode);
 680                 kmalloc_destroy(&hmp->mchain);
 681                 kfree(hmp, M_HAMMER2);
 682         }
 683         lockmgr(&hammer2_mntlk, LK_RELEASE);
 684         return (error);
 685 }
 686
 687 static
 688 int
 689 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 690              ino_t ino, struct vnode **vpp)
 691 {
 692         kprintf("hammer2_vget\n");
 693         return (EOPNOTSUPP);
 694 }
 695
 696 static
 697 int
 698 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 699 {
 700         hammer2_pfsmount_t *pmp;
 701         hammer2_mount_t *hmp;
 702         int error;
 703         struct vnode *vp;
 704
 705         pmp = MPTOPMP(mp);
 706         hmp = pmp->hmp;
 707         hammer2_mount_exlock(hmp);
 708         if (pmp->iroot == NULL) {
 709                 *vpp = NULL;
 710                 error = EINVAL;
 711         } else {
 712                 hammer2_inode_lock_sh(pmp->iroot);
 713                 vp = hammer2_igetv(pmp->iroot, &error);
 714                 hammer2_inode_unlock_sh(pmp->iroot);
 715                 *vpp = vp;
 716                 if (vp == NULL)
 717                         kprintf("vnodefail\n");
 718         }
 719         hammer2_mount_unlock(hmp);
 720
 721         return (error);
 722 }
 723
 724 /*
 725  * Filesystem status
 726  *
 727  * XXX incorporate ipdata->inode_quota and data_quota
 728  */
 729 static
 730 int
 731 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 732 {
 733         hammer2_pfsmount_t *pmp;
 734         hammer2_mount_t *hmp;
 735
 736         pmp = MPTOPMP(mp);
 737         hmp = MPTOHMP(mp);
 738
 739         mp->mnt_stat.f_files = pmp->inode_count;
 740         mp->mnt_stat.f_ffree = 0;
 741         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 742         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 743                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 744         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 745
 746         *sbp = mp->mnt_stat;
 747         return (0);
 748 }
 749
 750 static
 751 int
 752 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 753 {
 754         hammer2_pfsmount_t *pmp;
 755         hammer2_mount_t *hmp;
 756
 757         pmp = MPTOPMP(mp);
 758         hmp = MPTOHMP(mp);
 759
 760         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 761         mp->mnt_vstat.f_files = pmp->inode_count;
 762         mp->mnt_vstat.f_ffree = 0;
 763         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 764         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 765                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 766         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 767
 768         *sbp = mp->mnt_vstat;
 769         return (0);
 770 }
 771
 772 /*
 773  * Sync the entire filesystem; this is called from the filesystem syncer
 774  * process periodically and whenever a user calls sync(1) on the hammer
 775  * mountpoint.
 776  *
 777  * Currently is actually called from the syncer! \o/
 778  *
 779  * This task will have to snapshot the state of the dirty inode chain.
 780  * From that, it will have to make sure all of the inodes on the dirty
 781  * chain have IO initiated. We make sure that io is initiated for the root
 782  * block.
 783  *
 784  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 785  *
 786  * THINKS: side A vs side B, to have sync not stall all I/O?
 787  */
 788 static
 789 int
 790 hammer2_vfs_sync(struct mount *mp, int waitfor)
 791 {
 792         struct hammer2_sync_info info;
 793         hammer2_mount_t *hmp;
 794         int flags;
 795         int error;
 796         int i;
 797
 798         hmp = MPTOHMP(mp);
 799
 800         flags = VMSC_GETVP;
 801         if (waitfor & MNT_LAZY)
 802                 flags |= VMSC_ONEPASS;
 803
 804         hammer2_trans_init(&info.trans, hmp);
 805         info.error = 0;
 806         info.waitfor = MNT_NOWAIT;
 807         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 808                       hammer2_sync_scan1,
 809                       hammer2_sync_scan2, &info);
 810         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 811                 info.waitfor = waitfor;
 812                     vmntvnodescan(mp, flags,
 813                                   hammer2_sync_scan1,
 814                                   hammer2_sync_scan2, &info);
 815
 816         }
 817 #if 0
 818         if (waitfor == MNT_WAIT) {
 819                 /* XXX */
 820         } else {
 821                 /* XXX */
 822         }
 823 #endif
 824         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 825         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 826                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 827                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 828         }
 829         hammer2_chain_unlock(&hmp->vchain);
 830         hammer2_trans_done(&info.trans);
 831
 832         error = 0;
 833
 834         /*
 835          * We can't safely flush the volume header until we have
 836          * flushed any device buffers which have built up.
 837          */
 838 #if 0
 839         if ((waitfor & MNT_LAZY) == 0) {
 840                 waitfor = MNT_NOWAIT;
 841                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 842                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 843                 vn_unlock(hmp->devvp);
 844         }
 845 #endif
 846         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 847         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 848         vn_unlock(hmp->devvp);
 849
 850         /*
 851          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 852          * volume header needs synchronization via hmp->volsync.
 853          *
 854          * XXX synchronize the flag & data with only this flush XXX
 855          */
 856         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 857                 struct buf *bp;
 858
 859                 /*
 860                  * Synchronize the disk before flushing the volume
 861                  * header.
 862                  */
 863                 bp = getpbuf(NULL);
 864                 bp->b_bio1.bio_offset = 0;
 865                 bp->b_bufsize = 0;
 866                 bp->b_bcount = 0;
 867                 bp->b_cmd = BUF_CMD_FLUSH;
 868                 bp->b_bio1.bio_done = biodone_sync;
 869                 bp->b_bio1.bio_flags |= BIO_SYNC;
 870                 vn_strategy(hmp->devvp, &bp->b_bio1);
 871                 biowait(&bp->b_bio1, "h2vol");
 872                 relpbuf(bp, NULL);
 873
 874                 /*
 875                  * Then we can safely flush the version of the volume header
 876                  * synchronized by the flush code.
 877                  */
 878                 i = hmp->volhdrno + 1;
 879                 if (i >= HAMMER2_NUM_VOLHDRS)
 880                         i = 0;
 881                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 882                     hmp->volsync.volu_size) {
 883                         i = 0;
 884                 }
 885                 kprintf("sync volhdr %d %jd\n",
 886                         i, (intmax_t)hmp->volsync.volu_size);
 887                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 888                             HAMMER2_PBUFSIZE, 0, 0);
 889                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 890                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 891                 bawrite(bp);
 892                 hmp->volhdrno = i;
 893         }
 894         return (error);
 895 }
 896
 897 /*
 898  * Sync passes.
 899  *
 900  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 901  *       won't flush on those flags.  The syncer code above will do a
 902  *       general meta-data flush globally that will catch these flags.
 903  */
 904 static int
 905 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 906 {
 907         hammer2_inode_t *ip;
 908
 909         ip = VTOI(vp);
 910         if (vp->v_type == VNON || ip == NULL ||
 911             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 912              RB_EMPTY(&vp->v_rbdirty_tree))) {
 913                 return(-1);
 914         }
 915         return(0);
 916 }
 917
 918 static int
 919 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 920 {
 921         struct hammer2_sync_info *info = data;
 922         hammer2_inode_t *ip;
 923         int error;
 924
 925         ip = VTOI(vp);
 926         if (vp->v_type == VNON || vp->v_type == VBAD ||
 927             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 928              RB_EMPTY(&vp->v_rbdirty_tree))) {
 929                 return(0);
 930         }
 931         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 932         if (error)
 933                 info->error = error;
 934         return(0);
 935 }
 936
 937 static
 938 int
 939 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 940 {
 941         return (0);
 942 }
 943
 944 static
 945 int
 946 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 947                struct fid *fhp, struct vnode **vpp)
 948 {
 949         return (0);
 950 }
 951
 952 static
 953 int
 954 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 955                  int *exflagsp, struct ucred **credanonp)
 956 {
 957         return (0);
 958 }
 959
 960 /*
 961  * Support code for hammer2_mount().  Read, verify, and install the volume
 962  * header into the HMP
 963  *
 964  * XXX read four volhdrs and use the one with the highest TID whos CRC
 965  *     matches.
 966  *
 967  * XXX check iCRCs.
 968  *
 969  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
 970  *     nonexistant locations.
 971  *
 972  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
 973  */
 974 static
 975 int
 976 hammer2_install_volume_header(hammer2_mount_t *hmp)
 977 {
 978         hammer2_volume_data_t *vd;
 979         struct buf *bp;
 980         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
 981         int error_reported;
 982         int error;
 983         int valid;
 984         int i;
 985
 986         error_reported = 0;
 987         error = 0;
 988         valid = 0;
 989         bp = NULL;
 990
 991         /*
 992          * There are up to 4 copies of the volume header (syncs iterate
 993          * between them so there is no single master).  We don't trust the
 994          * volu_size field so we don't know precisely how large the filesystem
 995          * is, so depend on the OS to return an error if we go beyond the
 996          * block device's EOF.
 997          */
 998         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
 999                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1000                               HAMMER2_VOLUME_BYTES, &bp);
1001                 if (error) {
1002                         brelse(bp);
1003                         bp = NULL;
1004                         continue;
1005                 }
1006
1007                 vd = (struct hammer2_volume_data *) bp->b_data;
1008                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1009                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1010                         brelse(bp);
1011                         bp = NULL;
1012                         continue;
1013                 }
1014
1015                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1016                         /* XXX: Reversed-endianness filesystem */
1017                         kprintf("hammer2: reverse-endian filesystem detected");
1018                         brelse(bp);
1019                         bp = NULL;
1020                         continue;
1021                 }
1022
1023                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1024                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1025                                       HAMMER2_VOLUME_ICRC0_SIZE);
1026                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1027                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1028                                        HAMMER2_VOLUME_ICRC1_SIZE);
1029                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1030                         kprintf("hammer2 volume header crc "
1031                                 "mismatch copy #%d %08x/%08x\n",
1032                                 i, crc0, crc);
1033                         error_reported = 1;
1034                         brelse(bp);
1035                         bp = NULL;
1036                         continue;
1037                 }
1038                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1039                         valid = 1;
1040                         hmp->voldata = *vd;
1041                         hmp->volhdrno = i;
1042                 }
1043                 brelse(bp);
1044                 bp = NULL;
1045         }
1046         if (valid) {
1047                 hmp->volsync = hmp->voldata;
1048                 error = 0;
1049                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1050                         kprintf("hammer2: using volume header #%d\n",
1051                                 hmp->volhdrno);
1052                 }
1053         } else {
1054                 error = EINVAL;
1055                 kprintf("hammer2: no valid volume headers found!\n");
1056         }
1057         return (error);
1058 }
1059
1060 /*
1061  * Reconnect using the passed file pointer.  The caller must ref the
1062  * fp for us.
1063  */
1064 void
1065 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1066 {
1067         hammer2_inode_data_t *ipdata;
1068         size_t name_len;
1069
1070         /*
1071          * Closes old comm descriptor, kills threads, cleans up
1072          * states, then installs the new descriptor and creates
1073          * new threads.
1074          */
1075         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1076
1077         /*
1078          * Setup LNK_CONN fields for autoinitiated state machine
1079          */
1080         hammer2_inode_lock_ex(pmp->iroot);
1081         ipdata = &pmp->iroot->chain->data->ipdata;
1082         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1083         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1084         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1085         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1086         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1087         hammer2_inode_unlock_ex(pmp->iroot);
1088
1089         /*
1090          * Filter adjustment.  Clients do not need visibility into other
1091          * clients (otherwise millions of clients would present a serious
1092          * problem).  The fs_label also serves to restrict the namespace.
1093          */
1094         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1095         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1096         switch (ipdata->pfs_type) {
1097         case DMSG_PFSTYPE_CLIENT:
1098                 pmp->iocom.auto_lnk_conn.peer_mask &=
1099                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1100                 break;
1101         default:
1102                 break;
1103         }
1104
1105         name_len = ipdata->name_len;
1106         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1107                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1108         bcopy(ipdata->filename,
1109               pmp->iocom.auto_lnk_conn.fs_label,
1110               name_len);
1111         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1112
1113         /*
1114          * Setup LNK_SPAN fields for autoinitiated state machine
1115          */
1116         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1117         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1118         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1119         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1120         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1121         name_len = ipdata->name_len;
1122         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1123                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1124         bcopy(ipdata->filename,
1125               pmp->iocom.auto_lnk_span.fs_label,
1126               name_len);
1127         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1128
1129         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1130 }
1131
1132 static int
1133 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1134 {
1135         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1136         case DMSG_DBG_SHELL:
1137                 /*
1138                  * (non-transaction)
1139                  * Execute shell command (not supported atm)
1140                  */
1141                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1142                 break;
1143         case DMSG_DBG_SHELL | DMSGF_REPLY:
1144                 /*
1145                  * (non-transaction)
1146                  */
1147                 if (msg->aux_data) {
1148                         msg->aux_data[msg->aux_size - 1] = 0;
1149                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1150                 }
1151                 break;
1152         default:
1153                 /*
1154                  * Unsupported message received.  We only need to
1155                  * reply if it's a transaction in order to close our end.
1156                  * Ignore any one-way messages are any further messages
1157                  * associated with the transaction.
1158                  *
1159                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1160                  *       which might be one-way, replying to those would
1161                  *       cause an infinite ping-pong.
1162                  */
1163                 if (msg->any.head.cmd & DMSGF_CREATE)
1164                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1165                 break;
1166         }
1167         return(0);
1168 }
1169
1170 /*
1171  * This function is called after KDMSG has automatically handled processing
1172  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1173  *
1174  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1175  * advertises all available hammer2 super-root volumes.
1176  */
1177 static void
1178 hammer2_autodmsg(kdmsg_msg_t *msg)
1179 {
1180         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1181         hammer2_mount_t *hmp = pmp->hmp;
1182         int copyid;
1183
1184         /*
1185          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1186          * has already processed the reply, we use this calback as a shim
1187          * to know when we can advertise available super-root volumes.
1188          */
1189         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1190             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1191             msg->state == NULL) {
1192                 return;
1193         }
1194
1195         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1196
1197         if (msg->any.head.cmd & DMSGF_CREATE) {
1198                 kprintf("HAMMER2: VOLDATA DUMP\n");
1199
1200                 /*
1201                  * Dump the configuration stored in the volume header
1202                  */
1203                 hammer2_voldata_lock(hmp);
1204                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1205                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1206                                 continue;
1207                         hammer2_volconf_update(pmp, copyid);
1208                 }
1209                 hammer2_voldata_unlock(hmp, 0);
1210         }
1211         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1212             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1213                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1214         }
1215 }
1216
1217 /*
1218  * Volume configuration updates are passed onto the userland service
1219  * daemon via the open LNK_CONN transaction.
1220  */
1221 void
1222 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1223 {
1224         hammer2_mount_t *hmp = pmp->hmp;
1225         kdmsg_msg_t *msg;
1226
1227         /* XXX interlock against connection state termination */
1228         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1229         if (pmp->iocom.conn_state) {
1230                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1231                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1232                                             DMSG_LNK_VOLCONF, NULL, NULL);
1233                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1234                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1235                 msg->any.lnk_volconf.index = index;
1236                 kdmsg_msg_write(msg);
1237         }
1238 }