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