sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011-2013 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/nlookup.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/buf.h>
  42 #include <sys/uuid.h>
  43 #include <sys/vfsops.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/socket.h>
  46
  47 #include "hammer2.h"
  48 #include "hammer2_disk.h"
  49 #include "hammer2_mount.h"
  50
  51 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  52
  53 struct hammer2_sync_info {
  54         hammer2_trans_t trans;
  55         int error;
  56         int waitfor;
  57 };
  58
  59 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  60 static struct hammer2_mntlist hammer2_mntlist;
  61 static struct lock hammer2_mntlk;
  62
  63 int hammer2_debug;
  64 int hammer2_cluster_enable = 1;
  65 int hammer2_hardlink_enable = 1;
  66 long hammer2_iod_file_read;
  67 long hammer2_iod_meta_read;
  68 long hammer2_iod_indr_read;
  69 long hammer2_iod_fmap_read;
  70 long hammer2_iod_volu_read;
  71 long hammer2_iod_file_write;
  72 long hammer2_iod_meta_write;
  73 long hammer2_iod_indr_write;
  74 long hammer2_iod_fmap_write;
  75 long hammer2_iod_volu_write;
  76 long hammer2_ioa_file_read;
  77 long hammer2_ioa_meta_read;
  78 long hammer2_ioa_indr_read;
  79 long hammer2_ioa_fmap_read;
  80 long hammer2_ioa_volu_read;
  81 long hammer2_ioa_fmap_write;
  82 long hammer2_ioa_file_write;
  83 long hammer2_ioa_meta_write;
  84 long hammer2_ioa_indr_write;
  85 long hammer2_ioa_volu_write;
  86
  87 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
  88
  89 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
  90            &hammer2_debug, 0, "");
  91 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
  92            &hammer2_cluster_enable, 0, "");
  93 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
  94            &hammer2_hardlink_enable, 0, "");
  95
  96 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
  97            &hammer2_iod_file_read, 0, "");
  98 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
  99            &hammer2_iod_meta_read, 0, "");
 100 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 101            &hammer2_iod_indr_read, 0, "");
 102 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 103            &hammer2_iod_fmap_read, 0, "");
 104 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 105            &hammer2_iod_volu_read, 0, "");
 106
 107 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 108            &hammer2_iod_file_write, 0, "");
 109 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 110            &hammer2_iod_meta_write, 0, "");
 111 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 112            &hammer2_iod_indr_write, 0, "");
 113 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 114            &hammer2_iod_fmap_write, 0, "");
 115 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 116            &hammer2_iod_volu_write, 0, "");
 117
 118 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 119            &hammer2_ioa_file_read, 0, "");
 120 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 121            &hammer2_ioa_meta_read, 0, "");
 122 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 123            &hammer2_ioa_indr_read, 0, "");
 124 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 125            &hammer2_ioa_fmap_read, 0, "");
 126 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 127            &hammer2_ioa_volu_read, 0, "");
 128
 129 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 130            &hammer2_ioa_file_write, 0, "");
 131 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 132            &hammer2_ioa_meta_write, 0, "");
 133 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 134            &hammer2_ioa_indr_write, 0, "");
 135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 136            &hammer2_ioa_fmap_write, 0, "");
 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 138            &hammer2_ioa_volu_write, 0, "");
 139
 140 static int hammer2_vfs_init(struct vfsconf *conf);
 141 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 142                                 struct ucred *cred);
 143 static int hammer2_remount(struct mount *, char *, struct vnode *,
 144                                 struct ucred *);
 145 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 146 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 147 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 148                                 struct ucred *cred);
 149 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 150                                 struct ucred *cred);
 151 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 152 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 153                                 ino_t ino, struct vnode **vpp);
 154 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 155                                 struct fid *fhp, struct vnode **vpp);
 156 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 157 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 158                                 int *exflagsp, struct ucred **credanonp);
 159
 160 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 161 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
 162 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 163
 164 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 165 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 166
 167 /*
 168  * HAMMER2 vfs operations.
 169  */
 170 static struct vfsops hammer2_vfsops = {
 171         .vfs_init       = hammer2_vfs_init,
 172         .vfs_sync       = hammer2_vfs_sync,
 173         .vfs_mount      = hammer2_vfs_mount,
 174         .vfs_unmount    = hammer2_vfs_unmount,
 175         .vfs_root       = hammer2_vfs_root,
 176         .vfs_statfs     = hammer2_vfs_statfs,
 177         .vfs_statvfs    = hammer2_vfs_statvfs,
 178         .vfs_vget       = hammer2_vfs_vget,
 179         .vfs_vptofh     = hammer2_vfs_vptofh,
 180         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 181         .vfs_checkexp   = hammer2_vfs_checkexp
 182 };
 183
 184 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 185
 186 VFS_SET(hammer2_vfsops, hammer2, 0);
 187 MODULE_VERSION(hammer2, 1);
 188
 189 static
 190 int
 191 hammer2_vfs_init(struct vfsconf *conf)
 192 {
 193         int error;
 194
 195         error = 0;
 196
 197         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 198                 error = EINVAL;
 199         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 200                 error = EINVAL;
 201         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 202                 error = EINVAL;
 203
 204         if (error)
 205                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 206
 207         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 208         TAILQ_INIT(&hammer2_mntlist);
 209
 210         return (error);
 211 }
 212
 213 /*
 214  * Mount or remount HAMMER2 fileystem from physical media
 215  *
 216  *      mountroot
 217  *              mp              mount point structure
 218  *              path            NULL
 219  *              data            <unused>
 220  *              cred            <unused>
 221  *
 222  *      mount
 223  *              mp              mount point structure
 224  *              path            path to mount point
 225  *              data            pointer to argument structure in user space
 226  *                      volume  volume path (device@LABEL form)
 227  *                      hflags  user mount flags
 228  *              cred            user credentials
 229  *
 230  * RETURNS:     0       Success
 231  *              !0      error number
 232  */
 233 static
 234 int
 235 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 236                   struct ucred *cred)
 237 {
 238         struct hammer2_mount_info info;
 239         hammer2_pfsmount_t *pmp;
 240         hammer2_mount_t *hmp;
 241         hammer2_key_t lhc;
 242         struct vnode *devvp;
 243         struct nlookupdata nd;
 244         hammer2_chain_t *parent;
 245         hammer2_chain_t *schain;
 246         hammer2_chain_t *rchain;
 247         struct file *fp;
 248         char devstr[MNAMELEN];
 249         size_t size;
 250         size_t done;
 251         char *dev;
 252         char *label;
 253         int ronly = 1;
 254         int error;
 255
 256         hmp = NULL;
 257         pmp = NULL;
 258         dev = NULL;
 259         label = NULL;
 260         devvp = NULL;
 261
 262         kprintf("hammer2_mount\n");
 263
 264         if (path == NULL) {
 265                 /*
 266                  * Root mount
 267                  */
 268                 bzero(&info, sizeof(info));
 269                 info.cluster_fd = -1;
 270                 return (EOPNOTSUPP);
 271         } else {
 272                 /*
 273                  * Non-root mount or updating a mount
 274                  */
 275                 error = copyin(data, &info, sizeof(info));
 276                 if (error)
 277                         return (error);
 278
 279                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 280                 if (error)
 281                         return (error);
 282
 283                 /* Extract device and label */
 284                 dev = devstr;
 285                 label = strchr(devstr, '@');
 286                 if (label == NULL ||
 287                     ((label + 1) - dev) > done) {
 288                         return (EINVAL);
 289                 }
 290                 *label = '\0';
 291                 label++;
 292                 if (*label == '\0')
 293                         return (EINVAL);
 294
 295                 if (mp->mnt_flag & MNT_UPDATE) {
 296                         /* Update mount */
 297                         /* HAMMER2 implements NFS export via mountctl */
 298                         hmp = MPTOHMP(mp);
 299                         devvp = hmp->devvp;
 300                         error = hammer2_remount(mp, path, devvp, cred);
 301                         return error;
 302                 }
 303         }
 304
 305         /*
 306          * PFS mount
 307          *
 308          * Lookup name and verify it refers to a block device.
 309          */
 310         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 311         if (error == 0)
 312                 error = nlookup(&nd);
 313         if (error == 0)
 314                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 315         nlookup_done(&nd);
 316
 317         if (error == 0) {
 318                 if (vn_isdisk(devvp, &error))
 319                         error = vfs_mountedon(devvp);
 320         }
 321
 322         /*
 323          * Determine if the device has already been mounted.  After this
 324          * check hmp will be non-NULL if we are doing the second or more
 325          * hammer2 mounts from the same device.
 326          */
 327         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 328         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 329                 if (hmp->devvp == devvp)
 330                         break;
 331         }
 332
 333         /*
 334          * Open the device if this isn't a secondary mount and construct
 335          * the H2 device mount (hmp).
 336          */
 337         if (hmp == NULL) {
 338                 if (error == 0 && vcount(devvp) > 0)
 339                         error = EBUSY;
 340
 341                 /*
 342                  * Now open the device
 343                  */
 344                 if (error == 0) {
 345                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 346                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 347                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 348                         if (error == 0) {
 349                                 error = VOP_OPEN(devvp,
 350                                                  ronly ? FREAD : FREAD | FWRITE,
 351                                                  FSCRED, NULL);
 352                         }
 353                         vn_unlock(devvp);
 354                 }
 355                 if (error && devvp) {
 356                         vrele(devvp);
 357                         devvp = NULL;
 358                 }
 359                 if (error) {
 360                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 361                         return error;
 362                 }
 363                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 364                 hmp->ronly = ronly;
 365                 hmp->devvp = devvp;
 366                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 367                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 368
 369                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 370                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 371                 TAILQ_INIT(&hmp->transq);
 372
 373                 /*
 374                  * vchain setup. vchain.data is embedded.
 375                  * vchain.refs is initialized and will never drop to 0.
 376                  */
 377                 hmp->vchain.hmp = hmp;
 378                 hmp->vchain.refs = 1;
 379                 hmp->vchain.data = (void *)&hmp->voldata;
 380                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 381                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 382                 hmp->vchain.delete_tid = HAMMER2_MAX_TID;
 383                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 384                 /* hmp->vchain.u.xxx is left NULL */
 385
 386                 /*
 387                  * fchain setup.  fchain.data is embedded.
 388                  * fchain.refs is initialized and will never drop to 0.
 389                  *
 390                  * The data is not used but needs to be initialized to
 391                  * pass assertion muster.  We use this chain primarily
 392                  * as a placeholder for the freemap's top-level RBTREE
 393                  * so it does not interfere with the volume's topology
 394                  * RBTREE.
 395                  */
 396                 hmp->fchain.hmp = hmp;
 397                 hmp->fchain.refs = 1;
 398                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 399                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 400                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 401                 hmp->fchain.bref.methods =
 402                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 403                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 404                 hmp->fchain.delete_tid = HAMMER2_MAX_TID;
 405
 406                 hammer2_chain_core_alloc(&hmp->fchain, NULL);
 407                 /* hmp->fchain.u.xxx is left NULL */
 408
 409                 /*
 410                  * Install the volume header
 411                  */
 412                 error = hammer2_install_volume_header(hmp);
 413                 if (error) {
 414                         hammer2_vfs_unmount(mp, MNT_FORCE);
 415                         return error;
 416                 }
 417
 418                 /*
 419                  * First locate the super-root inode, which is key 0
 420                  * relative to the volume header's blockset.
 421                  *
 422                  * Then locate the root inode by scanning the directory keyspace
 423                  * represented by the label.
 424                  */
 425                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 426                 schain = hammer2_chain_lookup(&parent,
 427                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 428                 hammer2_chain_lookup_done(parent);
 429                 if (schain == NULL) {
 430                         kprintf("hammer2_mount: invalid super-root\n");
 431                         hammer2_vfs_unmount(mp, MNT_FORCE);
 432                         return EINVAL;
 433                 }
 434                 hammer2_chain_ref(schain);      /* for hmp->schain */
 435                 hmp->schain = schain;           /* left locked for inode_get */
 436                 hmp->sroot = hammer2_inode_get(NULL, NULL, schain);
 437                 hammer2_inode_ref(hmp->sroot);  /* for hmp->sroot */
 438                 hammer2_inode_unlock_ex(hmp->sroot, schain);
 439                 schain = NULL;
 440         }
 441
 442         /*
 443          * Block device opened successfully, finish initializing the
 444          * mount structure.
 445          *
 446          * From this point on we have to call hammer2_unmount() on failure.
 447          */
 448         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 449         pmp->mount_cluster = kmalloc(sizeof(hammer2_cluster_t), M_HAMMER2,
 450                                      M_WAITOK | M_ZERO);
 451         pmp->cluster = pmp->mount_cluster;
 452
 453         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 454         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 455
 456         pmp->mount_cluster->hmp = hmp;
 457         spin_init(&pmp->inum_spin);
 458         RB_INIT(&pmp->inum_tree);
 459
 460         kdmsg_iocom_init(&pmp->iocom, pmp,
 461                          KDMSG_IOCOMF_AUTOCONN |
 462                          KDMSG_IOCOMF_AUTOSPAN |
 463                          KDMSG_IOCOMF_AUTOCIRC,
 464                          pmp->mmsg, hammer2_rcvdmsg);
 465
 466         ccms_domain_init(&pmp->ccms_dom);
 467         ++hmp->pmp_count;
 468         lockmgr(&hammer2_mntlk, LK_RELEASE);
 469         kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 470
 471         mp->mnt_flag = MNT_LOCAL;
 472         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 473
 474         /*
 475          * required mount structure initializations
 476          */
 477         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 478         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 479
 480         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 481         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 482
 483         /*
 484          * Optional fields
 485          */
 486         mp->mnt_iosize_max = MAXPHYS;
 487         mp->mnt_data = (qaddr_t)pmp;
 488         pmp->mp = mp;
 489
 490         /*
 491          * schain only has 1 ref now for its hmp->schain assignment.
 492          * Setup for lookup (which will lock it).
 493          */
 494         parent = hammer2_chain_lookup_init(hmp->schain, 0);
 495         lhc = hammer2_dirhash(label, strlen(label));
 496         rchain = hammer2_chain_lookup(&parent,
 497                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 498                                       0);
 499         while (rchain) {
 500                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 501                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 502                         break;
 503                 }
 504                 rchain = hammer2_chain_next(&parent, rchain,
 505                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 506                                             0);
 507         }
 508         hammer2_chain_lookup_done(parent);
 509         if (rchain == NULL) {
 510                 kprintf("hammer2_mount: PFS label not found\n");
 511                 hammer2_vfs_unmount(mp, MNT_FORCE);
 512                 return EINVAL;
 513         }
 514         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 515                 hammer2_chain_unlock(rchain);
 516                 kprintf("hammer2_mount: PFS label already mounted!\n");
 517                 hammer2_vfs_unmount(mp, MNT_FORCE);
 518                 return EBUSY;
 519         }
 520         if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 521                 kprintf("hammer2_mount: PFS label currently recycling\n");
 522                 hammer2_vfs_unmount(mp, MNT_FORCE);
 523                 return EBUSY;
 524         }
 525
 526         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 527
 528         /*
 529          * NOTE: *_get() integrates chain's lock into the inode lock.
 530          */
 531         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 532         pmp->mount_cluster->rchain = rchain;    /* left held & unlocked */
 533         pmp->iroot = hammer2_inode_get(pmp, NULL, rchain);
 534         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 535         hammer2_inode_unlock_ex(pmp->iroot, rchain);
 536
 537         kprintf("iroot %p\n", pmp->iroot);
 538
 539         /*
 540          * Ref the cluster management messaging descriptor.  The mount
 541          * program deals with the other end of the communications pipe.
 542          */
 543         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 544         if (fp == NULL) {
 545                 kprintf("hammer2_mount: bad cluster_fd!\n");
 546                 hammer2_vfs_unmount(mp, MNT_FORCE);
 547                 return EBADF;
 548         }
 549         hammer2_cluster_reconnect(pmp, fp);
 550
 551         /*
 552          * Finish setup
 553          */
 554         vfs_getnewfsid(mp);
 555         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 556         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 557         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 558
 559         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 560         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 561         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 562         copyinstr(path, mp->mnt_stat.f_mntonname,
 563                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 564                   &size);
 565
 566         /*
 567          * Initial statfs to prime mnt_stat.
 568          */
 569         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 570
 571         return 0;
 572 }
 573
 574 static
 575 int
 576 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 577                 struct ucred *cred)
 578 {
 579         return (0);
 580 }
 581
 582 static
 583 int
 584 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 585 {
 586         hammer2_pfsmount_t *pmp;
 587         hammer2_mount_t *hmp;
 588         hammer2_cluster_t *cluster;
 589         int flags;
 590         int error = 0;
 591         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 592         int dumpcnt;
 593         struct vnode *devvp;
 594
 595         pmp = MPTOPMP(mp);
 596         cluster = pmp->mount_cluster;
 597         hmp = cluster->hmp;
 598         flags = 0;
 599
 600         if (mntflags & MNT_FORCE)
 601                 flags |= FORCECLOSE;
 602
 603         hammer2_mount_exlock(hmp);
 604
 605         /*
 606          * If mount initialization proceeded far enough we must flush
 607          * its vnodes.
 608          */
 609         if (pmp->iroot)
 610                 error = vflush(mp, 0, flags);
 611
 612         if (error) {
 613                 hammer2_mount_unlock(hmp);
 614                 return error;
 615         }
 616
 617         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 618         --hmp->pmp_count;
 619         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 620
 621         /*
 622          * Flush any left over chains.  The voldata lock is only used
 623          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 624          */
 625         hammer2_voldata_lock(hmp);
 626         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 627                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 628                 hammer2_voldata_unlock(hmp, 0);
 629                 hammer2_vfs_sync(mp, MNT_WAIT);
 630         } else {
 631                 hammer2_voldata_unlock(hmp, 0);
 632         }
 633         if (hmp->pmp_count == 0) {
 634                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 635                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 636                         kprintf("hammer2_unmount: chains left over after "
 637                                 "final sync\n");
 638                         if (hammer2_debug & 0x0010)
 639                                 Debugger("entered debugger");
 640                 }
 641         }
 642
 643         /*
 644          * Cleanup the root and super-root chain elements (which should be
 645          * clean).
 646          */
 647         if (pmp->iroot) {
 648 #if REPORT_REFS_ERRORS
 649                 if (pmp->iroot->refs != 1)
 650                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 651                                 pmp->iroot, pmp->iroot->refs);
 652 #else
 653                 KKASSERT(pmp->iroot->refs == 1);
 654 #endif
 655                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 656                 pmp->iroot = NULL;
 657         }
 658         if (cluster->rchain) {
 659                 atomic_clear_int(&cluster->rchain->flags,
 660                                  HAMMER2_CHAIN_MOUNTED);
 661 #if REPORT_REFS_ERRORS
 662                 if (cluster->rchain->refs != 1)
 663                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 664                                 cluster->rchain, cluster->rchain->refs);
 665 #else
 666                 KKASSERT(cluster->rchain->refs == 1);
 667 #endif
 668                 hammer2_chain_drop(cluster->rchain);
 669                 cluster->rchain = NULL;
 670         }
 671         ccms_domain_uninit(&pmp->ccms_dom);
 672
 673         /*
 674          * Kill cluster controller
 675          */
 676         kdmsg_iocom_uninit(&pmp->iocom);
 677
 678         /*
 679          * If no PFS's left drop the master hammer2_mount for the device.
 680          */
 681         if (hmp->pmp_count == 0) {
 682                 if (hmp->sroot) {
 683                         hammer2_inode_drop(hmp->sroot);
 684                         hmp->sroot = NULL;
 685                 }
 686                 if (hmp->schain) {
 687 #if REPORT_REFS_ERRORS
 688                         if (hmp->schain->refs != 1)
 689                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 690                                         hmp->schain, hmp->schain->refs);
 691 #else
 692                         KKASSERT(hmp->schain->refs == 1);
 693 #endif
 694                         hammer2_chain_drop(hmp->schain);
 695                         hmp->schain = NULL;
 696                 }
 697
 698                 /*
 699                  * Finish up with the device vnode
 700                  */
 701                 if ((devvp = hmp->devvp) != NULL) {
 702                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 703                         hmp->devvp = NULL;
 704                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 705                         vrele(devvp);
 706                         devvp = NULL;
 707                 }
 708
 709                 /*
 710                  * Final drop of embedded freemap root chain to clean up
 711                  * fchain.core (fchain structure is not flagged ALLOCATED
 712                  * so it is cleaned out and then left to rot).
 713                  */
 714                 hammer2_chain_drop(&hmp->fchain);
 715
 716                 /*
 717                  * Final drop of embedded volume root chain to clean up
 718                  * vchain.core (vchain structure is not flagged ALLOCATED
 719                  * so it is cleaned out and then left to rot).
 720                  */
 721                 dumpcnt = 50;
 722                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 723                 hammer2_mount_unlock(hmp);
 724                 hammer2_chain_drop(&hmp->vchain);
 725         } else {
 726                 hammer2_mount_unlock(hmp);
 727         }
 728
 729         pmp->mp = NULL;
 730         mp->mnt_data = NULL;
 731
 732         pmp->mount_cluster = NULL;
 733         pmp->cluster = NULL;            /* XXX */
 734
 735         kmalloc_destroy(&pmp->mmsg);
 736         kmalloc_destroy(&pmp->minode);
 737
 738         cluster->hmp = NULL;
 739
 740         kfree(cluster, M_HAMMER2);
 741         kfree(pmp, M_HAMMER2);
 742         if (hmp->pmp_count == 0) {
 743                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 744                 kmalloc_destroy(&hmp->mchain);
 745                 kfree(hmp, M_HAMMER2);
 746         }
 747         lockmgr(&hammer2_mntlk, LK_RELEASE);
 748
 749         return (error);
 750 }
 751
 752 static
 753 int
 754 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 755              ino_t ino, struct vnode **vpp)
 756 {
 757         kprintf("hammer2_vget\n");
 758         return (EOPNOTSUPP);
 759 }
 760
 761 static
 762 int
 763 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 764 {
 765         hammer2_pfsmount_t *pmp;
 766         hammer2_chain_t *parent;
 767         int error;
 768         struct vnode *vp;
 769
 770         pmp = MPTOPMP(mp);
 771         if (pmp->iroot == NULL) {
 772                 *vpp = NULL;
 773                 error = EINVAL;
 774         } else {
 775                 parent = hammer2_inode_lock_sh(pmp->iroot);
 776                 vp = hammer2_igetv(pmp->iroot, &error);
 777                 hammer2_inode_unlock_sh(pmp->iroot, parent);
 778                 *vpp = vp;
 779                 if (vp == NULL)
 780                         kprintf("vnodefail\n");
 781         }
 782
 783         return (error);
 784 }
 785
 786 /*
 787  * Filesystem status
 788  *
 789  * XXX incorporate ipdata->inode_quota and data_quota
 790  */
 791 static
 792 int
 793 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 794 {
 795         hammer2_pfsmount_t *pmp;
 796         hammer2_mount_t *hmp;
 797
 798         pmp = MPTOPMP(mp);
 799         hmp = MPTOHMP(mp);
 800
 801         mp->mnt_stat.f_files = pmp->inode_count;
 802         mp->mnt_stat.f_ffree = 0;
 803         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 804         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
 805         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 806
 807         *sbp = mp->mnt_stat;
 808         return (0);
 809 }
 810
 811 static
 812 int
 813 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 814 {
 815         hammer2_pfsmount_t *pmp;
 816         hammer2_mount_t *hmp;
 817
 818         pmp = MPTOPMP(mp);
 819         hmp = MPTOHMP(mp);
 820
 821         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 822         mp->mnt_vstat.f_files = pmp->inode_count;
 823         mp->mnt_vstat.f_ffree = 0;
 824         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 825         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
 826         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 827
 828         *sbp = mp->mnt_vstat;
 829         return (0);
 830 }
 831
 832 /*
 833  * Sync the entire filesystem; this is called from the filesystem syncer
 834  * process periodically and whenever a user calls sync(1) on the hammer
 835  * mountpoint.
 836  *
 837  * Currently is actually called from the syncer! \o/
 838  *
 839  * This task will have to snapshot the state of the dirty inode chain.
 840  * From that, it will have to make sure all of the inodes on the dirty
 841  * chain have IO initiated. We make sure that io is initiated for the root
 842  * block.
 843  *
 844  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 845  *
 846  * THINKS: side A vs side B, to have sync not stall all I/O?
 847  */
 848 static
 849 int
 850 hammer2_vfs_sync(struct mount *mp, int waitfor)
 851 {
 852         struct hammer2_sync_info info;
 853         hammer2_pfsmount_t *pmp;
 854         hammer2_cluster_t *cluster;
 855         hammer2_mount_t *hmp;
 856         int flags;
 857         int error;
 858         int i;
 859
 860         pmp = MPTOPMP(mp);
 861
 862         flags = VMSC_GETVP;
 863         if (waitfor & MNT_LAZY)
 864                 flags |= VMSC_ONEPASS;
 865
 866         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH);
 867
 868         info.error = 0;
 869         info.waitfor = MNT_NOWAIT;
 870         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 871                       hammer2_sync_scan1,
 872                       hammer2_sync_scan2, &info);
 873         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 874                 info.waitfor = waitfor;
 875                     vmntvnodescan(mp, flags,
 876                                   hammer2_sync_scan1,
 877                                   hammer2_sync_scan2, &info);
 878
 879         }
 880 #if 0
 881         if (waitfor == MNT_WAIT) {
 882                 /* XXX */
 883         } else {
 884                 /* XXX */
 885         }
 886 #endif
 887
 888         cluster = pmp->cluster;
 889         hmp = cluster->hmp;
 890
 891         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 892         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 893                                   HAMMER2_CHAIN_SUBMODIFIED)) {
 894                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 895         }
 896         hammer2_chain_unlock(&hmp->vchain);
 897
 898 #if 0
 899         /*
 900          * Rollup flush.  The fsyncs above basically just flushed
 901          * data blocks.  The flush below gets all the meta-data.
 902          */
 903         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
 904         if (hmp->fchain.flags & (HAMMER2_CHAIN_MODIFIED |
 905                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 906                 /* this will modify vchain as a side effect */
 907                 hammer2_chain_flush(&info.trans, &hmp->fchain);
 908         }
 909         hammer2_chain_unlock(&hmp->fchain);
 910 #endif
 911
 912
 913         error = 0;
 914
 915         /*
 916          * We can't safely flush the volume header until we have
 917          * flushed any device buffers which have built up.
 918          *
 919          * XXX this isn't being incremental
 920          */
 921         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 922         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 923         vn_unlock(hmp->devvp);
 924
 925         /*
 926          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 927          * volume header needs synchronization via hmp->volsync.
 928          *
 929          * XXX synchronize the flag & data with only this flush XXX
 930          */
 931         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 932                 struct buf *bp;
 933
 934                 /*
 935                  * Synchronize the disk before flushing the volume
 936                  * header.
 937                  */
 938                 bp = getpbuf(NULL);
 939                 bp->b_bio1.bio_offset = 0;
 940                 bp->b_bufsize = 0;
 941                 bp->b_bcount = 0;
 942                 bp->b_cmd = BUF_CMD_FLUSH;
 943                 bp->b_bio1.bio_done = biodone_sync;
 944                 bp->b_bio1.bio_flags |= BIO_SYNC;
 945                 vn_strategy(hmp->devvp, &bp->b_bio1);
 946                 biowait(&bp->b_bio1, "h2vol");
 947                 relpbuf(bp, NULL);
 948
 949                 /*
 950                  * Then we can safely flush the version of the volume header
 951                  * synchronized by the flush code.
 952                  */
 953                 i = hmp->volhdrno + 1;
 954                 if (i >= HAMMER2_NUM_VOLHDRS)
 955                         i = 0;
 956                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 957                     hmp->volsync.volu_size) {
 958                         i = 0;
 959                 }
 960                 kprintf("sync volhdr %d %jd\n",
 961                         i, (intmax_t)hmp->volsync.volu_size);
 962                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 963                             HAMMER2_PBUFSIZE, 0, 0);
 964                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 965                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 966                 bawrite(bp);
 967                 hmp->volhdrno = i;
 968         }
 969         hammer2_trans_done(&info.trans);
 970         return (error);
 971 }
 972
 973 /*
 974  * Sync passes.
 975  *
 976  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 977  *       won't flush on those flags.  The syncer code above will do a
 978  *       general meta-data flush globally that will catch these flags.
 979  */
 980 static int
 981 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 982 {
 983         hammer2_inode_t *ip;
 984
 985         ip = VTOI(vp);
 986         if (vp->v_type == VNON || ip == NULL ||
 987             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 988              RB_EMPTY(&vp->v_rbdirty_tree))) {
 989                 return(-1);
 990         }
 991         return(0);
 992 }
 993
 994 static int
 995 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 996 {
 997         struct hammer2_sync_info *info = data;
 998         hammer2_inode_t *ip;
 999         hammer2_chain_t *parent;
1000         int error;
1001
1002         ip = VTOI(vp);
1003         if (vp->v_type == VNON || vp->v_type == VBAD ||
1004             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
1005              RB_EMPTY(&vp->v_rbdirty_tree))) {
1006                 return(0);
1007         }
1008
1009         /*
1010          * VOP_FSYNC will start a new transaction so replicate some code
1011          * here to do it inline (see hammer2_vop_fsync()).
1012          */
1013         parent = hammer2_inode_lock_ex(ip);
1014         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1015         if (ip->vp)
1016                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
1017         hammer2_chain_flush(&info->trans, parent);
1018         hammer2_inode_unlock_ex(ip, parent);
1019         error = 0;
1020 #if 0
1021         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
1022 #endif
1023         if (error)
1024                 info->error = error;
1025         return(0);
1026 }
1027
1028 static
1029 int
1030 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1031 {
1032         return (0);
1033 }
1034
1035 static
1036 int
1037 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1038                struct fid *fhp, struct vnode **vpp)
1039 {
1040         return (0);
1041 }
1042
1043 static
1044 int
1045 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1046                  int *exflagsp, struct ucred **credanonp)
1047 {
1048         return (0);
1049 }
1050
1051 /*
1052  * Support code for hammer2_mount().  Read, verify, and install the volume
1053  * header into the HMP
1054  *
1055  * XXX read four volhdrs and use the one with the highest TID whos CRC
1056  *     matches.
1057  *
1058  * XXX check iCRCs.
1059  *
1060  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1061  *     nonexistant locations.
1062  *
1063  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1064  */
1065 static
1066 int
1067 hammer2_install_volume_header(hammer2_mount_t *hmp)
1068 {
1069         hammer2_volume_data_t *vd;
1070         struct buf *bp;
1071         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1072         int error_reported;
1073         int error;
1074         int valid;
1075         int i;
1076
1077         error_reported = 0;
1078         error = 0;
1079         valid = 0;
1080         bp = NULL;
1081
1082         /*
1083          * There are up to 4 copies of the volume header (syncs iterate
1084          * between them so there is no single master).  We don't trust the
1085          * volu_size field so we don't know precisely how large the filesystem
1086          * is, so depend on the OS to return an error if we go beyond the
1087          * block device's EOF.
1088          */
1089         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1090                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1091                               HAMMER2_VOLUME_BYTES, &bp);
1092                 if (error) {
1093                         brelse(bp);
1094                         bp = NULL;
1095                         continue;
1096                 }
1097
1098                 vd = (struct hammer2_volume_data *) bp->b_data;
1099                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1100                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1101                         brelse(bp);
1102                         bp = NULL;
1103                         continue;
1104                 }
1105
1106                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1107                         /* XXX: Reversed-endianness filesystem */
1108                         kprintf("hammer2: reverse-endian filesystem detected");
1109                         brelse(bp);
1110                         bp = NULL;
1111                         continue;
1112                 }
1113
1114                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1115                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1116                                       HAMMER2_VOLUME_ICRC0_SIZE);
1117                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1118                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1119                                        HAMMER2_VOLUME_ICRC1_SIZE);
1120                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1121                         kprintf("hammer2 volume header crc "
1122                                 "mismatch copy #%d %08x/%08x\n",
1123                                 i, crc0, crc);
1124                         error_reported = 1;
1125                         brelse(bp);
1126                         bp = NULL;
1127                         continue;
1128                 }
1129                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1130                         valid = 1;
1131                         hmp->voldata = *vd;
1132                         hmp->volhdrno = i;
1133                 }
1134                 brelse(bp);
1135                 bp = NULL;
1136         }
1137         if (valid) {
1138                 hmp->volsync = hmp->voldata;
1139                 error = 0;
1140                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1141                         kprintf("hammer2: using volume header #%d\n",
1142                                 hmp->volhdrno);
1143                 }
1144         } else {
1145                 error = EINVAL;
1146                 kprintf("hammer2: no valid volume headers found!\n");
1147         }
1148         return (error);
1149 }
1150
1151 /*
1152  * Reconnect using the passed file pointer.  The caller must ref the
1153  * fp for us.
1154  */
1155 void
1156 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1157 {
1158         hammer2_inode_data_t *ipdata;
1159         hammer2_chain_t *parent;
1160         hammer2_mount_t *hmp;
1161         size_t name_len;
1162
1163         hmp = pmp->mount_cluster->hmp;
1164
1165         /*
1166          * Closes old comm descriptor, kills threads, cleans up
1167          * states, then installs the new descriptor and creates
1168          * new threads.
1169          */
1170         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1171
1172         /*
1173          * Setup LNK_CONN fields for autoinitiated state machine
1174          */
1175         parent = hammer2_inode_lock_ex(pmp->iroot);
1176         ipdata = &parent->data->ipdata;
1177         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1178         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1179         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1180         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1181         pmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
1182
1183         /*
1184          * Filter adjustment.  Clients do not need visibility into other
1185          * clients (otherwise millions of clients would present a serious
1186          * problem).  The fs_label also serves to restrict the namespace.
1187          */
1188         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1189         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1190         switch (ipdata->pfs_type) {
1191         case DMSG_PFSTYPE_CLIENT:
1192                 pmp->iocom.auto_lnk_conn.peer_mask &=
1193                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1194                 break;
1195         default:
1196                 break;
1197         }
1198
1199         name_len = ipdata->name_len;
1200         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1201                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1202         bcopy(ipdata->filename,
1203               pmp->iocom.auto_lnk_conn.fs_label,
1204               name_len);
1205         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1206
1207         /*
1208          * Setup LNK_SPAN fields for autoinitiated state machine
1209          */
1210         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1211         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1212         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1213         pmp->iocom.auto_lnk_span.peer_type = hmp->voldata.peer_type;
1214         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1215         name_len = ipdata->name_len;
1216         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1217                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1218         bcopy(ipdata->filename,
1219               pmp->iocom.auto_lnk_span.fs_label,
1220               name_len);
1221         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1222         hammer2_inode_unlock_ex(pmp->iroot, parent);
1223
1224         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1225 }
1226
1227 static int
1228 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1229 {
1230         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1231         case DMSG_DBG_SHELL:
1232                 /*
1233                  * (non-transaction)
1234                  * Execute shell command (not supported atm)
1235                  */
1236                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1237                 break;
1238         case DMSG_DBG_SHELL | DMSGF_REPLY:
1239                 /*
1240                  * (non-transaction)
1241                  */
1242                 if (msg->aux_data) {
1243                         msg->aux_data[msg->aux_size - 1] = 0;
1244                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1245                 }
1246                 break;
1247         default:
1248                 /*
1249                  * Unsupported message received.  We only need to
1250                  * reply if it's a transaction in order to close our end.
1251                  * Ignore any one-way messages are any further messages
1252                  * associated with the transaction.
1253                  *
1254                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1255                  *       which might be one-way, replying to those would
1256                  *       cause an infinite ping-pong.
1257                  */
1258                 if (msg->any.head.cmd & DMSGF_CREATE)
1259                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1260                 break;
1261         }
1262         return(0);
1263 }
1264
1265 /*
1266  * This function is called after KDMSG has automatically handled processing
1267  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1268  *
1269  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1270  * advertises all available hammer2 super-root volumes.
1271  */
1272 static void
1273 hammer2_autodmsg(kdmsg_msg_t *msg)
1274 {
1275         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1276         hammer2_mount_t *hmp = pmp->mount_cluster->hmp;
1277         int copyid;
1278
1279         /*
1280          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1281          * has already processed the reply, we use this calback as a shim
1282          * to know when we can advertise available super-root volumes.
1283          */
1284         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1285             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1286             msg->state == NULL) {
1287                 return;
1288         }
1289
1290         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1291
1292         if (msg->any.head.cmd & DMSGF_CREATE) {
1293                 kprintf("HAMMER2: VOLDATA DUMP\n");
1294
1295                 /*
1296                  * Dump the configuration stored in the volume header
1297                  */
1298                 hammer2_voldata_lock(hmp);
1299                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1300                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1301                                 continue;
1302                         hammer2_volconf_update(pmp, copyid);
1303                 }
1304                 hammer2_voldata_unlock(hmp, 0);
1305         }
1306         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1307             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1308                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1309         }
1310 }
1311
1312 /*
1313  * Volume configuration updates are passed onto the userland service
1314  * daemon via the open LNK_CONN transaction.
1315  */
1316 void
1317 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1318 {
1319         hammer2_mount_t *hmp = pmp->mount_cluster->hmp;
1320         kdmsg_msg_t *msg;
1321
1322         /* XXX interlock against connection state termination */
1323         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1324         if (pmp->iocom.conn_state) {
1325                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1326                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1327                                             DMSG_LNK_VOLCONF, NULL, NULL);
1328                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1329                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1330                 msg->any.lnk_volconf.index = index;
1331                 kdmsg_msg_write(msg);
1332         }
1333 }
1334
1335 void
1336 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1337 {
1338         hammer2_chain_t *scan;
1339
1340         --*countp;
1341         if (*countp == 0) {
1342                 kprintf("%*.*s...\n", tab, tab, "");
1343                 return;
1344         }
1345         if (*countp < 0)
1346                 return;
1347         kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p dt=%s refs=%d",
1348                 tab, tab, "",
1349                 chain->index, chain, chain->bref.type, chain->flags,
1350                 chain->core,
1351                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1352                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1353                 chain->next_parent,
1354                 (chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
1355                 chain->refs);
1356         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1357                 kprintf("\n");
1358         else
1359                 kprintf(" {\n");
1360         RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1361                 hammer2_dump_chain(scan, tab + 4, countp);
1362         }
1363         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1364                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1365                         kprintf("%*.*s}(%s)\n", tab, tab, "",
1366                                 chain->data->ipdata.filename);
1367                 else
1368                         kprintf("%*.*s}\n", tab, tab, "");
1369         }
1370 }