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                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 439                 hammer2_inode_ref(hmp->sroot);  /* for hmp->sroot */
 440                 hammer2_inode_unlock_ex(hmp->sroot, NULL);
 441         } else {
 442                 schain = hmp->schain;
 443                 hammer2_chain_lock(hmp, schain, HAMMER2_RESOLVE_ALWAYS);
 444         }
 445
 446         /*
 447          * schain left locked at this point, use as basis for PFS search.
 448          */
 449         parent = schain;
 450         lhc = hammer2_dirhash(label, strlen(label));
 451         rchain = hammer2_chain_lookup(hmp, &parent,
 452                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 453                                       0);
 454         while (rchain) {
 455                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 456                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 457                         break;
 458                 }
 459                 rchain = hammer2_chain_next(hmp, &parent, rchain,
 460                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 461                                             0);
 462         }
 463         hammer2_chain_unlock(hmp, parent);
 464         if (rchain == NULL) {
 465                 kprintf("hammer2_mount: PFS label not found\n");
 466                 hammer2_vfs_unmount(mp, MNT_FORCE);
 467                 return EINVAL;
 468         }
 469         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 470                 hammer2_chain_unlock(hmp, rchain);
 471                 kprintf("hammer2_mount: PFS label already mounted!\n");
 472                 hammer2_vfs_unmount(mp, MNT_FORCE);
 473                 return EBUSY;
 474         }
 475         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 476
 477         /*
 478          * NOTE: *_get() integrates chain's lock into the inode lock.
 479          */
 480         hammer2_chain_ref(hmp, rchain);         /* for pmp->rchain */
 481         pmp->rchain = rchain;                   /* left held & unlocked */
 482         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 483         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 484         hammer2_inode_unlock_ex(pmp->iroot, rchain); /* iroot & its chain */
 485
 486         kprintf("iroot %p\n", pmp->iroot);
 487
 488         /*
 489          * Ref the cluster management messaging descriptor.  The mount
 490          * program deals with the other end of the communications pipe.
 491          */
 492         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 493         if (fp == NULL) {
 494                 kprintf("hammer2_mount: bad cluster_fd!\n");
 495                 hammer2_vfs_unmount(mp, MNT_FORCE);
 496                 return EBADF;
 497         }
 498         hammer2_cluster_reconnect(pmp, fp);
 499
 500         /*
 501          * Finish setup
 502          */
 503         vfs_getnewfsid(mp);
 504         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 505         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 506         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 507
 508         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 509         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 510         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 511         copyinstr(path, mp->mnt_stat.f_mntonname,
 512                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 513                   &size);
 514
 515         /*
 516          * Initial statfs to prime mnt_stat.
 517          */
 518         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 519
 520         return 0;
 521 }
 522
 523 static
 524 int
 525 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 526                 struct ucred *cred)
 527 {
 528         return (0);
 529 }
 530
 531 static
 532 int
 533 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 534 {
 535         hammer2_pfsmount_t *pmp;
 536         hammer2_mount_t *hmp;
 537         hammer2_chain_t *chain;
 538         int flags;
 539         int error = 0;
 540         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 541         struct vnode *devvp;
 542
 543         pmp = MPTOPMP(mp);
 544         hmp = pmp->hmp;
 545         flags = 0;
 546
 547         if (mntflags & MNT_FORCE)
 548                 flags |= FORCECLOSE;
 549
 550         hammer2_mount_exlock(hmp);
 551
 552         /*
 553          * If mount initialization proceeded far enough we must flush
 554          * its vnodes.
 555          */
 556         if (pmp->iroot)
 557                 error = vflush(mp, 0, flags);
 558
 559         if (error)
 560                 return error;
 561
 562         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 563         --hmp->pmp_count;
 564         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 565
 566         /*
 567          * Flush any left over chains.  The voldata lock is only used
 568          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 569          */
 570         hammer2_voldata_lock(hmp);
 571         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 572                                  HAMMER2_CHAIN_MODIFIED_AUX |
 573                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 574                 hammer2_voldata_unlock(hmp);
 575                 hammer2_vfs_sync(mp, MNT_WAIT);
 576         } else {
 577                 hammer2_voldata_unlock(hmp);
 578         }
 579         if (hmp->pmp_count == 0) {
 580                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 581                                          HAMMER2_CHAIN_MODIFIED_AUX |
 582                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 583                         kprintf("hammer2_unmount: chains left over after "
 584                                 "final sync\n");
 585                         if (hammer2_debug & 0x0010)
 586                                 Debugger("entered debugger");
 587                 }
 588         }
 589
 590         /*
 591          * Cleanup the root and super-root chain elements (which should be
 592          * clean).
 593          */
 594         if (pmp->iroot) {
 595                 chain = hammer2_inode_lock_ex(pmp->iroot);
 596                 hammer2_inode_put(pmp->iroot, chain);
 597                 /* lock destroyed by the put */
 598                 KKASSERT(pmp->iroot->refs == 1);
 599                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 600                 pmp->iroot = NULL;
 601         }
 602         if (pmp->rchain) {
 603                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 604                 KKASSERT(pmp->rchain->refs == 1);
 605                 hammer2_chain_drop(hmp, pmp->rchain);
 606                 pmp->rchain = NULL;
 607         }
 608         ccms_domain_uninit(&pmp->ccms_dom);
 609
 610         /*
 611          * Kill cluster controller
 612          */
 613         kdmsg_iocom_uninit(&pmp->iocom);
 614
 615         /*
 616          * If no PFS's left drop the master hammer2_mount for the device.
 617          */
 618         if (hmp->pmp_count == 0) {
 619                 if (hmp->sroot) {
 620                         hammer2_inode_drop(hmp->sroot);
 621                         hmp->sroot = NULL;
 622                 }
 623                 if (hmp->schain) {
 624                         KKASSERT(hmp->schain->refs == 1);
 625                         hammer2_chain_drop(hmp, hmp->schain);
 626                         hmp->schain = NULL;
 627                 }
 628
 629                 /*
 630                  * Finish up with the device vnode
 631                  */
 632                 if ((devvp = hmp->devvp) != NULL) {
 633                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 634                         hmp->devvp = NULL;
 635                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 636                         vrele(devvp);
 637                         devvp = NULL;
 638                 }
 639         }
 640         hammer2_mount_unlock(hmp);
 641
 642         pmp->mp = NULL;
 643         pmp->hmp = NULL;
 644         mp->mnt_data = NULL;
 645
 646         kmalloc_destroy(&pmp->mmsg);
 647
 648         kfree(pmp, M_HAMMER2);
 649         if (hmp->pmp_count == 0) {
 650                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 651                 kmalloc_destroy(&hmp->minode);
 652                 kmalloc_destroy(&hmp->mchain);
 653                 kfree(hmp, M_HAMMER2);
 654         }
 655         lockmgr(&hammer2_mntlk, LK_RELEASE);
 656         return (error);
 657 }
 658
 659 static
 660 int
 661 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 662              ino_t ino, struct vnode **vpp)
 663 {
 664         kprintf("hammer2_vget\n");
 665         return (EOPNOTSUPP);
 666 }
 667
 668 static
 669 int
 670 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 671 {
 672         hammer2_pfsmount_t *pmp;
 673         hammer2_chain_t *ichain;
 674         hammer2_mount_t *hmp;
 675         int error;
 676         struct vnode *vp;
 677
 678         pmp = MPTOPMP(mp);
 679         hmp = pmp->hmp;
 680         hammer2_mount_exlock(hmp);
 681         if (pmp->iroot == NULL) {
 682                 *vpp = NULL;
 683                 error = EINVAL;
 684         } else {
 685                 ichain = hammer2_inode_lock_sh(pmp->iroot);
 686                 vp = hammer2_igetv(pmp->iroot, &error);
 687                 hammer2_inode_unlock_sh(pmp->iroot, ichain);
 688                 *vpp = vp;
 689                 if (vp == NULL)
 690                         kprintf("vnodefail\n");
 691         }
 692         hammer2_mount_unlock(hmp);
 693
 694         return (error);
 695 }
 696
 697 /*
 698  * Filesystem status
 699  *
 700  * XXX incorporate ipdata->inode_quota and data_quota
 701  */
 702 static
 703 int
 704 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 705 {
 706         hammer2_pfsmount_t *pmp;
 707         hammer2_mount_t *hmp;
 708
 709         pmp = MPTOPMP(mp);
 710         hmp = MPTOHMP(mp);
 711
 712         mp->mnt_stat.f_files = pmp->inode_count;
 713         mp->mnt_stat.f_ffree = 0;
 714         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 715         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 716                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 717         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 718
 719         *sbp = mp->mnt_stat;
 720         return (0);
 721 }
 722
 723 static
 724 int
 725 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 726 {
 727         hammer2_pfsmount_t *pmp;
 728         hammer2_mount_t *hmp;
 729
 730         pmp = MPTOPMP(mp);
 731         hmp = MPTOHMP(mp);
 732
 733         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 734         mp->mnt_vstat.f_files = pmp->inode_count;
 735         mp->mnt_vstat.f_ffree = 0;
 736         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 737         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 738                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 739         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 740
 741         *sbp = mp->mnt_vstat;
 742         return (0);
 743 }
 744
 745 /*
 746  * Sync the entire filesystem; this is called from the filesystem syncer
 747  * process periodically and whenever a user calls sync(1) on the hammer
 748  * mountpoint.
 749  *
 750  * Currently is actually called from the syncer! \o/
 751  *
 752  * This task will have to snapshot the state of the dirty inode chain.
 753  * From that, it will have to make sure all of the inodes on the dirty
 754  * chain have IO initiated. We make sure that io is initiated for the root
 755  * block.
 756  *
 757  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 758  *
 759  * THINKS: side A vs side B, to have sync not stall all I/O?
 760  */
 761 static
 762 int
 763 hammer2_vfs_sync(struct mount *mp, int waitfor)
 764 {
 765         struct hammer2_sync_info info;
 766         hammer2_mount_t *hmp;
 767         int flags;
 768         int error;
 769         int haswork;
 770         int i;
 771
 772         hmp = MPTOHMP(mp);
 773
 774         flags = VMSC_GETVP;
 775         if (waitfor & MNT_LAZY)
 776                 flags |= VMSC_ONEPASS;
 777
 778         info.error = 0;
 779         info.waitfor = MNT_NOWAIT;
 780         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 781                       hammer2_sync_scan1,
 782                       hammer2_sync_scan2, &info);
 783         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 784                 info.waitfor = waitfor;
 785                     vmntvnodescan(mp, flags,
 786                                   hammer2_sync_scan1,
 787                                   hammer2_sync_scan2, &info);
 788
 789         }
 790 #if 0
 791         if (waitfor == MNT_WAIT) {
 792                 /* XXX */
 793         } else {
 794                 /* XXX */
 795         }
 796 #endif
 797         hammer2_chain_lock(hmp, &hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 798         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 799                                  HAMMER2_CHAIN_MODIFIED_AUX |
 800                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 801                 hammer2_chain_flush(hmp, &hmp->vchain, 0);
 802                 haswork = 1;
 803         } else {
 804                 haswork = 0;
 805         }
 806         hammer2_chain_unlock(hmp, &hmp->vchain);
 807
 808         error = 0;
 809
 810         /*
 811          * We can't safely flush the volume header until we have
 812          * flushed any device buffers which have built up.
 813          */
 814 #if 0
 815         if ((waitfor & MNT_LAZY) == 0) {
 816                 waitfor = MNT_NOWAIT;
 817                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 818                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 819                 vn_unlock(hmp->devvp);
 820         }
 821 #endif
 822         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 823         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 824         vn_unlock(hmp->devvp);
 825
 826         if (error == 0 && haswork) {
 827                 struct buf *bp;
 828
 829                 /*
 830                  * Synchronize the disk before flushing the volume
 831                  * header.
 832                  */
 833                 bp = getpbuf(NULL);
 834                 bp->b_bio1.bio_offset = 0;
 835                 bp->b_bufsize = 0;
 836                 bp->b_bcount = 0;
 837                 bp->b_cmd = BUF_CMD_FLUSH;
 838                 bp->b_bio1.bio_done = biodone_sync;
 839                 bp->b_bio1.bio_flags |= BIO_SYNC;
 840                 vn_strategy(hmp->devvp, &bp->b_bio1);
 841                 biowait(&bp->b_bio1, "h2vol");
 842                 relpbuf(bp, NULL);
 843
 844                 /*
 845                  * Then we can safely flush the version of the volume header
 846                  * synchronized by the flush code.
 847                  */
 848                 i = hmp->volhdrno + 1;
 849                 if (i >= HAMMER2_NUM_VOLHDRS)
 850                         i = 0;
 851                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 852                     hmp->volsync.volu_size) {
 853                         i = 0;
 854                 }
 855                 kprintf("sync volhdr %d %jd\n",
 856                         i, (intmax_t)hmp->volsync.volu_size);
 857                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 858                             HAMMER2_PBUFSIZE, 0, 0);
 859                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 860                 bawrite(bp);
 861                 hmp->volhdrno = i;
 862         }
 863         return (error);
 864 }
 865
 866 /*
 867  * Sync passes.
 868  *
 869  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 870  *       won't flush on those flags.  The syncer code above will do a
 871  *       general meta-data flush globally that will catch these flags.
 872  */
 873 static int
 874 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 875 {
 876         hammer2_inode_t *ip;
 877
 878         ip = VTOI(vp);
 879         if (vp->v_type == VNON || ip == NULL ||
 880             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 881              RB_EMPTY(&vp->v_rbdirty_tree))) {
 882                 return(-1);
 883         }
 884         return(0);
 885 }
 886
 887 static int
 888 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 889 {
 890         struct hammer2_sync_info *info = data;
 891         hammer2_inode_t *ip;
 892         int error;
 893
 894         ip = VTOI(vp);
 895         if (vp->v_type == VNON || vp->v_type == VBAD ||
 896             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 897              RB_EMPTY(&vp->v_rbdirty_tree))) {
 898                 return(0);
 899         }
 900         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 901         if (error)
 902                 info->error = error;
 903         return(0);
 904 }
 905
 906 static
 907 int
 908 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 909 {
 910         return (0);
 911 }
 912
 913 static
 914 int
 915 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 916                struct fid *fhp, struct vnode **vpp)
 917 {
 918         return (0);
 919 }
 920
 921 static
 922 int
 923 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 924                  int *exflagsp, struct ucred **credanonp)
 925 {
 926         return (0);
 927 }
 928
 929 /*
 930  * Support code for hammer2_mount().  Read, verify, and install the volume
 931  * header into the HMP
 932  *
 933  * XXX read four volhdrs and use the one with the highest TID whos CRC
 934  *     matches.
 935  *
 936  * XXX check iCRCs.
 937  *
 938  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
 939  *     nonexistant locations.
 940  *
 941  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
 942  */
 943 static
 944 int
 945 hammer2_install_volume_header(hammer2_mount_t *hmp)
 946 {
 947         hammer2_volume_data_t *vd;
 948         struct buf *bp;
 949         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
 950         int error_reported;
 951         int error;
 952         int valid;
 953         int i;
 954
 955         error_reported = 0;
 956         error = 0;
 957         valid = 0;
 958         bp = NULL;
 959
 960         /*
 961          * There are up to 4 copies of the volume header (syncs iterate
 962          * between them so there is no single master).  We don't trust the
 963          * volu_size field so we don't know precisely how large the filesystem
 964          * is, so depend on the OS to return an error if we go beyond the
 965          * block device's EOF.
 966          */
 967         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
 968                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 969                               HAMMER2_VOLUME_BYTES, &bp);
 970                 if (error) {
 971                         brelse(bp);
 972                         bp = NULL;
 973                         continue;
 974                 }
 975
 976                 vd = (struct hammer2_volume_data *) bp->b_data;
 977                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
 978                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
 979                         brelse(bp);
 980                         bp = NULL;
 981                         continue;
 982                 }
 983
 984                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
 985                         /* XXX: Reversed-endianness filesystem */
 986                         kprintf("hammer2: reverse-endian filesystem detected");
 987                         brelse(bp);
 988                         bp = NULL;
 989                         continue;
 990                 }
 991
 992                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
 993                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
 994                                       HAMMER2_VOLUME_ICRC0_SIZE);
 995                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
 996                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
 997                                        HAMMER2_VOLUME_ICRC1_SIZE);
 998                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
 999                         kprintf("hammer2 volume header crc "
1000                                 "mismatch copy #%d %08x/%08x\n",
1001                                 i, crc0, crc);
1002                         error_reported = 1;
1003                         brelse(bp);
1004                         bp = NULL;
1005                         continue;
1006                 }
1007                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1008                         valid = 1;
1009                         hmp->voldata = *vd;
1010                         hmp->volhdrno = i;
1011                 }
1012                 brelse(bp);
1013                 bp = NULL;
1014         }
1015         if (valid) {
1016                 hmp->volsync = hmp->voldata;
1017                 error = 0;
1018                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1019                         kprintf("hammer2: using volume header #%d\n",
1020                                 hmp->volhdrno);
1021                 }
1022         } else {
1023                 error = EINVAL;
1024                 kprintf("hammer2: no valid volume headers found!\n");
1025         }
1026         return (error);
1027 }
1028
1029 /*
1030  * Reconnect using the passed file pointer.  The caller must ref the
1031  * fp for us.
1032  */
1033 void
1034 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1035 {
1036         hammer2_chain_t *chain;
1037         hammer2_inode_data_t *ipdata;
1038         size_t name_len;
1039
1040         /*
1041          * Closes old comm descriptor, kills threads, cleans up
1042          * states, then installs the new descriptor and creates
1043          * new threads.
1044          */
1045         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1046
1047         /*
1048          * Setup LNK_CONN fields for autoinitiated state machine
1049          */
1050         chain = hammer2_inode_lock_ex(pmp->iroot);
1051         ipdata = &chain->data->ipdata;
1052         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1053         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1054         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1055         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1056         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1057         hammer2_inode_unlock_ex(pmp->iroot, chain);
1058
1059         /*
1060          * Filter adjustment.  Clients do not need visibility into other
1061          * clients (otherwise millions of clients would present a serious
1062          * problem).  The fs_label also serves to restrict the namespace.
1063          */
1064         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1065         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1066         switch (ipdata->pfs_type) {
1067         case DMSG_PFSTYPE_CLIENT:
1068                 pmp->iocom.auto_lnk_conn.peer_mask &=
1069                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1070                 break;
1071         default:
1072                 break;
1073         }
1074
1075         name_len = ipdata->name_len;
1076         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1077                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1078         bcopy(ipdata->filename,
1079               pmp->iocom.auto_lnk_conn.fs_label,
1080               name_len);
1081         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1082
1083         /*
1084          * Setup LNK_SPAN fields for autoinitiated state machine
1085          */
1086         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1087         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1088         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1089         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1090         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1091         name_len = ipdata->name_len;
1092         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1093                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1094         bcopy(ipdata->filename,
1095               pmp->iocom.auto_lnk_span.fs_label,
1096               name_len);
1097         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1098
1099         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1100 }
1101
1102 static int
1103 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1104 {
1105         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1106         case DMSG_DBG_SHELL:
1107                 /*
1108                  * (non-transaction)
1109                  * Execute shell command (not supported atm)
1110                  */
1111                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1112                 break;
1113         case DMSG_DBG_SHELL | DMSGF_REPLY:
1114                 /*
1115                  * (non-transaction)
1116                  */
1117                 if (msg->aux_data) {
1118                         msg->aux_data[msg->aux_size - 1] = 0;
1119                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1120                 }
1121                 break;
1122         default:
1123                 /*
1124                  * Unsupported message received.  We only need to
1125                  * reply if it's a transaction in order to close our end.
1126                  * Ignore any one-way messages are any further messages
1127                  * associated with the transaction.
1128                  *
1129                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1130                  *       which might be one-way, replying to those would
1131                  *       cause an infinite ping-pong.
1132                  */
1133                 if (msg->any.head.cmd & DMSGF_CREATE)
1134                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1135                 break;
1136         }
1137         return(0);
1138 }
1139
1140 /*
1141  * This function is called after KDMSG has automatically handled processing
1142  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1143  *
1144  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1145  * advertises all available hammer2 super-root volumes.
1146  */
1147 static void
1148 hammer2_autodmsg(kdmsg_msg_t *msg)
1149 {
1150         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1151         hammer2_mount_t *hmp = pmp->hmp;
1152         int copyid;
1153
1154         /*
1155          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1156          * has already processed the reply, we use this calback as a shim
1157          * to know when we can advertise available super-root volumes.
1158          */
1159         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1160             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1161             msg->state == NULL) {
1162                 return;
1163         }
1164
1165         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1166
1167         if (msg->any.head.cmd & DMSGF_CREATE) {
1168                 kprintf("HAMMER2: VOLDATA DUMP\n");
1169
1170                 /*
1171                  * Dump the configuration stored in the volume header
1172                  */
1173                 hammer2_voldata_lock(hmp);
1174                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1175                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1176                                 continue;
1177                         hammer2_volconf_update(pmp, copyid);
1178                 }
1179                 hammer2_voldata_unlock(hmp);
1180         }
1181         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1182             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1183                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1184         }
1185 }
1186
1187 /*
1188  * Volume configuration updates are passed onto the userland service
1189  * daemon via the open LNK_CONN transaction.
1190  */
1191 void
1192 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1193 {
1194         hammer2_mount_t *hmp = pmp->hmp;
1195         kdmsg_msg_t *msg;
1196
1197         /* XXX interlock against connection state termination */
1198         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1199         if (pmp->iocom.conn_state) {
1200                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1201                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1202                                             DMSG_LNK_VOLCONF, NULL, NULL);
1203                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1204                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1205                 msg->any.lnk_volconf.index = index;
1206                 kdmsg_msg_write(msg);
1207         }
1208 }