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 create_hmp;
 255         int error;
 256
 257         hmp = NULL;
 258         pmp = NULL;
 259         dev = NULL;
 260         label = NULL;
 261         devvp = NULL;
 262
 263         kprintf("hammer2_mount\n");
 264
 265         if (path == NULL) {
 266                 /*
 267                  * Root mount
 268                  */
 269                 bzero(&info, sizeof(info));
 270                 info.cluster_fd = -1;
 271                 return (EOPNOTSUPP);
 272         } else {
 273                 /*
 274                  * Non-root mount or updating a mount
 275                  */
 276                 error = copyin(data, &info, sizeof(info));
 277                 if (error)
 278                         return (error);
 279
 280                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 281                 if (error)
 282                         return (error);
 283
 284                 /* Extract device and label */
 285                 dev = devstr;
 286                 label = strchr(devstr, '@');
 287                 if (label == NULL ||
 288                     ((label + 1) - dev) > done) {
 289                         return (EINVAL);
 290                 }
 291                 *label = '\0';
 292                 label++;
 293                 if (*label == '\0')
 294                         return (EINVAL);
 295
 296                 if (mp->mnt_flag & MNT_UPDATE) {
 297                         /* Update mount */
 298                         /* HAMMER2 implements NFS export via mountctl */
 299                         hmp = MPTOHMP(mp);
 300                         devvp = hmp->devvp;
 301                         error = hammer2_remount(mp, path, devvp, cred);
 302                         return error;
 303                 }
 304         }
 305
 306         /*
 307          * PFS mount
 308          *
 309          * Lookup name and verify it refers to a block device.
 310          */
 311         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 312         if (error == 0)
 313                 error = nlookup(&nd);
 314         if (error == 0)
 315                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 316         nlookup_done(&nd);
 317
 318         if (error == 0) {
 319                 if (vn_isdisk(devvp, &error))
 320                         error = vfs_mountedon(devvp);
 321         }
 322
 323         /*
 324          * Determine if the device has already been mounted.  After this
 325          * check hmp will be non-NULL if we are doing the second or more
 326          * hammer2 mounts from the same device.
 327          */
 328         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 329         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 330                 if (hmp->devvp == devvp)
 331                         break;
 332         }
 333
 334         /*
 335          * Open the device if this isn't a secondary mount
 336          */
 337         if (hmp) {
 338                 create_hmp = 0;
 339         } else {
 340                 create_hmp = 1;
 341                 if (error == 0 && vcount(devvp) > 0)
 342                         error = EBUSY;
 343
 344                 /*
 345                  * Now open the device
 346                  */
 347                 if (error == 0) {
 348                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 349                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 350                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 351                         if (error == 0) {
 352                                 error = VOP_OPEN(devvp,
 353                                                  ronly ? FREAD : FREAD | FWRITE,
 354                                                  FSCRED, NULL);
 355                         }
 356                         vn_unlock(devvp);
 357                 }
 358                 if (error && devvp) {
 359                         vrele(devvp);
 360                         devvp = NULL;
 361                 }
 362                 if (error) {
 363                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 364                         return error;
 365                 }
 366         }
 367
 368         /*
 369          * Block device opened successfully, finish initializing the
 370          * mount structure.
 371          *
 372          * From this point on we have to call hammer2_unmount() on failure.
 373          */
 374         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 375         mp->mnt_data = (qaddr_t)pmp;
 376         pmp->mp = mp;
 377
 378         spin_init(&pmp->inum_spin);
 379         RB_INIT(&pmp->inum_tree);
 380
 381         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 382         kdmsg_iocom_init(&pmp->iocom, pmp,
 383                          KDMSG_IOCOMF_AUTOCONN |
 384                          KDMSG_IOCOMF_AUTOSPAN |
 385                          KDMSG_IOCOMF_AUTOCIRC,
 386                          pmp->mmsg, hammer2_rcvdmsg);
 387
 388         if (create_hmp) {
 389                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 390                 hmp->ronly = ronly;
 391                 hmp->devvp = devvp;
 392                 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
 393                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 394                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 395         }
 396         ccms_domain_init(&pmp->ccms_dom);
 397         pmp->hmp = hmp;
 398         ++hmp->pmp_count;
 399         lockmgr(&hammer2_mntlk, LK_RELEASE);
 400         kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 401
 402         mp->mnt_flag = MNT_LOCAL;
 403         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 404
 405         if (create_hmp) {
 406                 /*
 407                  * Presetup
 408                  */
 409                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 410                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 411                 TAILQ_INIT(&hmp->transq);
 412
 413                 /*
 414                  * vchain setup. vchain.data is embedded.
 415                  * vchain.refs is initialized and will never drop to 0.
 416                  */
 417                 hmp->vchain.hmp = hmp;
 418                 hmp->vchain.refs = 1;
 419                 hmp->vchain.data = (void *)&hmp->voldata;
 420                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 421                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 422                 hmp->vchain.delete_tid = HAMMER2_MAX_TID;
 423                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 424                 /* hmp->vchain.u.xxx is left NULL */
 425
 426                 /*
 427                  * fchain setup.  fchain.data is embedded.
 428                  * fchain.refs is initialized and will never drop to 0.
 429                  *
 430                  * The data is not used but needs to be initialized to
 431                  * pass assertion muster.  We use this chain primarily
 432                  * as a placeholder for the freemap's top-level RBTREE
 433                  * so it does not interfere with the volume's topology
 434                  * RBTREE.
 435                  */
 436                 hmp->fchain.hmp = hmp;
 437                 hmp->fchain.refs = 1;
 438                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 439                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 440                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 441                 hmp->fchain.bref.methods =
 442                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 443                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 444                 hmp->fchain.delete_tid = HAMMER2_MAX_TID;
 445
 446                 hammer2_chain_core_alloc(&hmp->fchain, NULL);
 447                 /* hmp->fchain.u.xxx is left NULL */
 448
 449                 /*
 450                  * Install the volume header
 451                  */
 452                 error = hammer2_install_volume_header(hmp);
 453                 if (error) {
 454                         hammer2_vfs_unmount(mp, MNT_FORCE);
 455                         return error;
 456                 }
 457         }
 458
 459         /*
 460          * required mount structure initializations
 461          */
 462         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 463         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 464
 465         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 466         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 467
 468         /*
 469          * Optional fields
 470          */
 471         mp->mnt_iosize_max = MAXPHYS;
 472
 473         /*
 474          * First locate the super-root inode, which is key 0 relative to the
 475          * volume header's blockset.
 476          *
 477          * Then locate the root inode by scanning the directory keyspace
 478          * represented by the label.
 479          */
 480         if (create_hmp) {
 481                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 482                 schain = hammer2_chain_lookup(&parent,
 483                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 484                 hammer2_chain_lookup_done(parent);
 485                 if (schain == NULL) {
 486                         kprintf("hammer2_mount: invalid super-root\n");
 487                         hammer2_vfs_unmount(mp, MNT_FORCE);
 488                         return EINVAL;
 489                 }
 490                 hammer2_chain_ref(schain);      /* for hmp->schain */
 491                 hmp->schain = schain;           /* left locked for inode_get */
 492                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 493                 hammer2_inode_ref(hmp->sroot);       /* for hmp->sroot */
 494                 hammer2_inode_unlock_ex(hmp->sroot, schain);
 495         } else {
 496                 schain = hmp->schain;
 497         }
 498
 499         /*
 500          * schain only has 1 ref now for its hmp->schain assignment.
 501          * Setup for lookup (which will lock it).
 502          */
 503         parent = hammer2_chain_lookup_init(schain, 0);
 504         lhc = hammer2_dirhash(label, strlen(label));
 505         rchain = hammer2_chain_lookup(&parent,
 506                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 507                                       0);
 508         while (rchain) {
 509                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 510                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 511                         break;
 512                 }
 513                 rchain = hammer2_chain_next(&parent, rchain,
 514                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 515                                             0);
 516         }
 517         hammer2_chain_lookup_done(parent);
 518         if (rchain == NULL) {
 519                 kprintf("hammer2_mount: PFS label not found\n");
 520                 hammer2_vfs_unmount(mp, MNT_FORCE);
 521                 return EINVAL;
 522         }
 523         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 524                 hammer2_chain_unlock(rchain);
 525                 kprintf("hammer2_mount: PFS label already mounted!\n");
 526                 hammer2_vfs_unmount(mp, MNT_FORCE);
 527                 return EBUSY;
 528         }
 529         if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 530                 kprintf("hammer2_mount: PFS label currently recycling\n");
 531                 hammer2_vfs_unmount(mp, MNT_FORCE);
 532                 return EBUSY;
 533         }
 534
 535         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 536
 537         /*
 538          * NOTE: *_get() integrates chain's lock into the inode lock.
 539          */
 540         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 541         pmp->rchain = rchain;                   /* left held & unlocked */
 542         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 543         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 544         hammer2_inode_unlock_ex(pmp->iroot, rchain);
 545
 546         kprintf("iroot %p\n", pmp->iroot);
 547
 548         /*
 549          * Ref the cluster management messaging descriptor.  The mount
 550          * program deals with the other end of the communications pipe.
 551          */
 552         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 553         if (fp == NULL) {
 554                 kprintf("hammer2_mount: bad cluster_fd!\n");
 555                 hammer2_vfs_unmount(mp, MNT_FORCE);
 556                 return EBADF;
 557         }
 558         hammer2_cluster_reconnect(pmp, fp);
 559
 560         /*
 561          * Finish setup
 562          */
 563         vfs_getnewfsid(mp);
 564         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 565         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 566         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 567
 568         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 569         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 570         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 571         copyinstr(path, mp->mnt_stat.f_mntonname,
 572                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 573                   &size);
 574
 575         /*
 576          * Initial statfs to prime mnt_stat.
 577          */
 578         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 579
 580         return 0;
 581 }
 582
 583 static
 584 int
 585 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 586                 struct ucred *cred)
 587 {
 588         return (0);
 589 }
 590
 591 static
 592 int
 593 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 594 {
 595         hammer2_pfsmount_t *pmp;
 596         hammer2_mount_t *hmp;
 597         int flags;
 598         int error = 0;
 599         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 600         int dumpcnt;
 601         struct vnode *devvp;
 602
 603         pmp = MPTOPMP(mp);
 604         hmp = pmp->hmp;
 605         flags = 0;
 606
 607         if (mntflags & MNT_FORCE)
 608                 flags |= FORCECLOSE;
 609
 610         hammer2_mount_exlock(hmp);
 611
 612         /*
 613          * If mount initialization proceeded far enough we must flush
 614          * its vnodes.
 615          */
 616         if (pmp->iroot)
 617                 error = vflush(mp, 0, flags);
 618
 619         if (error) {
 620                 hammer2_mount_unlock(hmp);
 621                 return error;
 622         }
 623
 624         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 625         --hmp->pmp_count;
 626         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 627
 628         /*
 629          * Flush any left over chains.  The voldata lock is only used
 630          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 631          */
 632         hammer2_voldata_lock(hmp);
 633         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 634                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 635                 hammer2_voldata_unlock(hmp, 0);
 636                 hammer2_vfs_sync(mp, MNT_WAIT);
 637         } else {
 638                 hammer2_voldata_unlock(hmp, 0);
 639         }
 640         if (hmp->pmp_count == 0) {
 641                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 642                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 643                         kprintf("hammer2_unmount: chains left over after "
 644                                 "final sync\n");
 645                         if (hammer2_debug & 0x0010)
 646                                 Debugger("entered debugger");
 647                 }
 648         }
 649
 650         /*
 651          * Cleanup the root and super-root chain elements (which should be
 652          * clean).
 653          */
 654         if (pmp->iroot) {
 655 #if REPORT_REFS_ERRORS
 656                 if (pmp->iroot->refs != 1)
 657                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 658                                 pmp->iroot, pmp->iroot->refs);
 659 #else
 660                 KKASSERT(pmp->iroot->refs == 1);
 661 #endif
 662                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 663                 pmp->iroot = NULL;
 664         }
 665         if (pmp->rchain) {
 666                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 667 #if REPORT_REFS_ERRORS
 668                 if (pmp->rchain->refs != 1)
 669                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 670                                 pmp->rchain, pmp->rchain->refs);
 671 #else
 672                 KKASSERT(pmp->rchain->refs == 1);
 673 #endif
 674                 hammer2_chain_drop(pmp->rchain);
 675                 pmp->rchain = NULL;
 676         }
 677         ccms_domain_uninit(&pmp->ccms_dom);
 678
 679         /*
 680          * Kill cluster controller
 681          */
 682         kdmsg_iocom_uninit(&pmp->iocom);
 683
 684         /*
 685          * If no PFS's left drop the master hammer2_mount for the device.
 686          */
 687         if (hmp->pmp_count == 0) {
 688                 if (hmp->sroot) {
 689                         hammer2_inode_drop(hmp->sroot);
 690                         hmp->sroot = NULL;
 691                 }
 692                 if (hmp->schain) {
 693 #if REPORT_REFS_ERRORS
 694                         if (hmp->schain->refs != 1)
 695                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 696                                         hmp->schain, hmp->schain->refs);
 697 #else
 698                         KKASSERT(hmp->schain->refs == 1);
 699 #endif
 700                         hammer2_chain_drop(hmp->schain);
 701                         hmp->schain = NULL;
 702                 }
 703
 704                 /*
 705                  * Finish up with the device vnode
 706                  */
 707                 if ((devvp = hmp->devvp) != NULL) {
 708                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 709                         hmp->devvp = NULL;
 710                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 711                         vrele(devvp);
 712                         devvp = NULL;
 713                 }
 714
 715                 /*
 716                  * Final drop of embedded freemap root chain to clean up
 717                  * fchain.core (fchain structure is not flagged ALLOCATED
 718                  * so it is cleaned out and then left to rot).
 719                  */
 720                 hammer2_chain_drop(&hmp->fchain);
 721
 722                 /*
 723                  * Final drop of embedded volume root chain to clean up
 724                  * vchain.core (vchain structure is not flagged ALLOCATED
 725                  * so it is cleaned out and then left to rot).
 726                  */
 727                 dumpcnt = 50;
 728                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 729                 hammer2_mount_unlock(hmp);
 730                 hammer2_chain_drop(&hmp->vchain);
 731         } else {
 732                 hammer2_mount_unlock(hmp);
 733         }
 734
 735         pmp->mp = NULL;
 736         pmp->hmp = NULL;
 737         mp->mnt_data = NULL;
 738
 739         kmalloc_destroy(&pmp->mmsg);
 740
 741         kfree(pmp, M_HAMMER2);
 742         if (hmp->pmp_count == 0) {
 743                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 744                 kmalloc_destroy(&hmp->minode);
 745                 kmalloc_destroy(&hmp->mchain);
 746                 kfree(hmp, M_HAMMER2);
 747         }
 748         lockmgr(&hammer2_mntlk, LK_RELEASE);
 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_mount_t *hmp;
 767         hammer2_chain_t *parent;
 768         int error;
 769         struct vnode *vp;
 770
 771         pmp = MPTOPMP(mp);
 772         hmp = pmp->hmp;
 773         hammer2_mount_exlock(hmp);
 774         if (pmp->iroot == NULL) {
 775                 *vpp = NULL;
 776                 error = EINVAL;
 777         } else {
 778                 parent = hammer2_inode_lock_sh(pmp->iroot);
 779                 vp = hammer2_igetv(pmp->iroot, &error);
 780                 hammer2_inode_unlock_sh(pmp->iroot, parent);
 781                 *vpp = vp;
 782                 if (vp == NULL)
 783                         kprintf("vnodefail\n");
 784         }
 785         hammer2_mount_unlock(hmp);
 786
 787         return (error);
 788 }
 789
 790 /*
 791  * Filesystem status
 792  *
 793  * XXX incorporate ipdata->inode_quota and data_quota
 794  */
 795 static
 796 int
 797 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 798 {
 799         hammer2_pfsmount_t *pmp;
 800         hammer2_mount_t *hmp;
 801
 802         pmp = MPTOPMP(mp);
 803         hmp = MPTOHMP(mp);
 804
 805         mp->mnt_stat.f_files = pmp->inode_count;
 806         mp->mnt_stat.f_ffree = 0;
 807         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 808         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 809                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 810         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 811
 812         *sbp = mp->mnt_stat;
 813         return (0);
 814 }
 815
 816 static
 817 int
 818 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 819 {
 820         hammer2_pfsmount_t *pmp;
 821         hammer2_mount_t *hmp;
 822
 823         pmp = MPTOPMP(mp);
 824         hmp = MPTOHMP(mp);
 825
 826         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 827         mp->mnt_vstat.f_files = pmp->inode_count;
 828         mp->mnt_vstat.f_ffree = 0;
 829         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 830         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 831                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 832         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 833
 834         *sbp = mp->mnt_vstat;
 835         return (0);
 836 }
 837
 838 /*
 839  * Sync the entire filesystem; this is called from the filesystem syncer
 840  * process periodically and whenever a user calls sync(1) on the hammer
 841  * mountpoint.
 842  *
 843  * Currently is actually called from the syncer! \o/
 844  *
 845  * This task will have to snapshot the state of the dirty inode chain.
 846  * From that, it will have to make sure all of the inodes on the dirty
 847  * chain have IO initiated. We make sure that io is initiated for the root
 848  * block.
 849  *
 850  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 851  *
 852  * THINKS: side A vs side B, to have sync not stall all I/O?
 853  */
 854 static
 855 int
 856 hammer2_vfs_sync(struct mount *mp, int waitfor)
 857 {
 858         struct hammer2_sync_info info;
 859         hammer2_mount_t *hmp;
 860         int flags;
 861         int error;
 862         int i;
 863 #if 0
 864         int dumpcnt;
 865 #endif
 866
 867         hmp = MPTOHMP(mp);
 868 #if 0
 869         if ((waitfor & MNT_LAZY) == 0) {
 870                 dumpcnt = 50;
 871                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 872         }
 873 #endif
 874
 875         flags = VMSC_GETVP;
 876         if (waitfor & MNT_LAZY)
 877                 flags |= VMSC_ONEPASS;
 878
 879         hammer2_trans_init(&info.trans, hmp, NULL, HAMMER2_TRANS_ISFLUSH);
 880
 881         info.error = 0;
 882         info.waitfor = MNT_NOWAIT;
 883         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 884                       hammer2_sync_scan1,
 885                       hammer2_sync_scan2, &info);
 886         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 887                 info.waitfor = waitfor;
 888                     vmntvnodescan(mp, flags,
 889                                   hammer2_sync_scan1,
 890                                   hammer2_sync_scan2, &info);
 891
 892         }
 893 #if 0
 894         if (waitfor == MNT_WAIT) {
 895                 /* XXX */
 896         } else {
 897                 /* XXX */
 898         }
 899 #endif
 900         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 901         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 902                                   HAMMER2_CHAIN_SUBMODIFIED)) {
 903                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 904         }
 905         hammer2_chain_unlock(&hmp->vchain);
 906
 907 #if 0
 908         /*
 909          * Rollup flush.  The fsyncs above basically just flushed
 910          * data blocks.  The flush below gets all the meta-data.
 911          */
 912         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
 913         if (hmp->fchain.flags & (HAMMER2_CHAIN_MODIFIED |
 914                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 915                 /* this will modify vchain as a side effect */
 916                 hammer2_chain_flush(&info.trans, &hmp->fchain);
 917         }
 918         hammer2_chain_unlock(&hmp->fchain);
 919 #endif
 920
 921
 922         error = 0;
 923
 924         /*
 925          * We can't safely flush the volume header until we have
 926          * flushed any device buffers which have built up.
 927          *
 928          * XXX this isn't being incremental
 929          */
 930         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 931         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 932         vn_unlock(hmp->devvp);
 933
 934         /*
 935          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 936          * volume header needs synchronization via hmp->volsync.
 937          *
 938          * XXX synchronize the flag & data with only this flush XXX
 939          */
 940         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 941                 struct buf *bp;
 942
 943                 /*
 944                  * Synchronize the disk before flushing the volume
 945                  * header.
 946                  */
 947                 bp = getpbuf(NULL);
 948                 bp->b_bio1.bio_offset = 0;
 949                 bp->b_bufsize = 0;
 950                 bp->b_bcount = 0;
 951                 bp->b_cmd = BUF_CMD_FLUSH;
 952                 bp->b_bio1.bio_done = biodone_sync;
 953                 bp->b_bio1.bio_flags |= BIO_SYNC;
 954                 vn_strategy(hmp->devvp, &bp->b_bio1);
 955                 biowait(&bp->b_bio1, "h2vol");
 956                 relpbuf(bp, NULL);
 957
 958                 /*
 959                  * Then we can safely flush the version of the volume header
 960                  * synchronized by the flush code.
 961                  */
 962                 i = hmp->volhdrno + 1;
 963                 if (i >= HAMMER2_NUM_VOLHDRS)
 964                         i = 0;
 965                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 966                     hmp->volsync.volu_size) {
 967                         i = 0;
 968                 }
 969                 kprintf("sync volhdr %d %jd\n",
 970                         i, (intmax_t)hmp->volsync.volu_size);
 971                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 972                             HAMMER2_PBUFSIZE, 0, 0);
 973                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 974                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 975                 bawrite(bp);
 976                 hmp->volhdrno = i;
 977         }
 978         hammer2_trans_done(&info.trans);
 979         return (error);
 980 }
 981
 982 /*
 983  * Sync passes.
 984  *
 985  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 986  *       won't flush on those flags.  The syncer code above will do a
 987  *       general meta-data flush globally that will catch these flags.
 988  */
 989 static int
 990 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 991 {
 992         hammer2_inode_t *ip;
 993
 994         ip = VTOI(vp);
 995         if (vp->v_type == VNON || ip == NULL ||
 996             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 997              RB_EMPTY(&vp->v_rbdirty_tree))) {
 998                 return(-1);
 999         }
1000         return(0);
1001 }
1002
1003 static int
1004 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
1005 {
1006         struct hammer2_sync_info *info = data;
1007         hammer2_inode_t *ip;
1008         hammer2_chain_t *parent;
1009         int error;
1010
1011         ip = VTOI(vp);
1012         if (vp->v_type == VNON || vp->v_type == VBAD ||
1013             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
1014              RB_EMPTY(&vp->v_rbdirty_tree))) {
1015                 return(0);
1016         }
1017
1018         /*
1019          * VOP_FSYNC will start a new transaction so replicate some code
1020          * here to do it inline (see hammer2_vop_fsync()).
1021          */
1022         parent = hammer2_inode_lock_ex(ip);
1023         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1024         if (ip->vp)
1025                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
1026         hammer2_chain_flush(&info->trans, parent);
1027         hammer2_inode_unlock_ex(ip, parent);
1028         error = 0;
1029 #if 0
1030         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
1031 #endif
1032         if (error)
1033                 info->error = error;
1034         return(0);
1035 }
1036
1037 static
1038 int
1039 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1040 {
1041         return (0);
1042 }
1043
1044 static
1045 int
1046 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1047                struct fid *fhp, struct vnode **vpp)
1048 {
1049         return (0);
1050 }
1051
1052 static
1053 int
1054 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1055                  int *exflagsp, struct ucred **credanonp)
1056 {
1057         return (0);
1058 }
1059
1060 /*
1061  * Support code for hammer2_mount().  Read, verify, and install the volume
1062  * header into the HMP
1063  *
1064  * XXX read four volhdrs and use the one with the highest TID whos CRC
1065  *     matches.
1066  *
1067  * XXX check iCRCs.
1068  *
1069  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1070  *     nonexistant locations.
1071  *
1072  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1073  */
1074 static
1075 int
1076 hammer2_install_volume_header(hammer2_mount_t *hmp)
1077 {
1078         hammer2_volume_data_t *vd;
1079         struct buf *bp;
1080         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1081         int error_reported;
1082         int error;
1083         int valid;
1084         int i;
1085
1086         error_reported = 0;
1087         error = 0;
1088         valid = 0;
1089         bp = NULL;
1090
1091         /*
1092          * There are up to 4 copies of the volume header (syncs iterate
1093          * between them so there is no single master).  We don't trust the
1094          * volu_size field so we don't know precisely how large the filesystem
1095          * is, so depend on the OS to return an error if we go beyond the
1096          * block device's EOF.
1097          */
1098         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1099                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1100                               HAMMER2_VOLUME_BYTES, &bp);
1101                 if (error) {
1102                         brelse(bp);
1103                         bp = NULL;
1104                         continue;
1105                 }
1106
1107                 vd = (struct hammer2_volume_data *) bp->b_data;
1108                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1109                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1110                         brelse(bp);
1111                         bp = NULL;
1112                         continue;
1113                 }
1114
1115                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1116                         /* XXX: Reversed-endianness filesystem */
1117                         kprintf("hammer2: reverse-endian filesystem detected");
1118                         brelse(bp);
1119                         bp = NULL;
1120                         continue;
1121                 }
1122
1123                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1124                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1125                                       HAMMER2_VOLUME_ICRC0_SIZE);
1126                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1127                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1128                                        HAMMER2_VOLUME_ICRC1_SIZE);
1129                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1130                         kprintf("hammer2 volume header crc "
1131                                 "mismatch copy #%d %08x/%08x\n",
1132                                 i, crc0, crc);
1133                         error_reported = 1;
1134                         brelse(bp);
1135                         bp = NULL;
1136                         continue;
1137                 }
1138                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1139                         valid = 1;
1140                         hmp->voldata = *vd;
1141                         hmp->volhdrno = i;
1142                 }
1143                 brelse(bp);
1144                 bp = NULL;
1145         }
1146         if (valid) {
1147                 hmp->volsync = hmp->voldata;
1148                 error = 0;
1149                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1150                         kprintf("hammer2: using volume header #%d\n",
1151                                 hmp->volhdrno);
1152                 }
1153         } else {
1154                 error = EINVAL;
1155                 kprintf("hammer2: no valid volume headers found!\n");
1156         }
1157         return (error);
1158 }
1159
1160 /*
1161  * Reconnect using the passed file pointer.  The caller must ref the
1162  * fp for us.
1163  */
1164 void
1165 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1166 {
1167         hammer2_inode_data_t *ipdata;
1168         hammer2_chain_t *parent;
1169         size_t name_len;
1170
1171         /*
1172          * Closes old comm descriptor, kills threads, cleans up
1173          * states, then installs the new descriptor and creates
1174          * new threads.
1175          */
1176         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1177
1178         /*
1179          * Setup LNK_CONN fields for autoinitiated state machine
1180          */
1181         parent = hammer2_inode_lock_ex(pmp->iroot);
1182         ipdata = &parent->data->ipdata;
1183         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1184         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1185         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1186         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1187         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1188
1189         /*
1190          * Filter adjustment.  Clients do not need visibility into other
1191          * clients (otherwise millions of clients would present a serious
1192          * problem).  The fs_label also serves to restrict the namespace.
1193          */
1194         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1195         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1196         switch (ipdata->pfs_type) {
1197         case DMSG_PFSTYPE_CLIENT:
1198                 pmp->iocom.auto_lnk_conn.peer_mask &=
1199                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1200                 break;
1201         default:
1202                 break;
1203         }
1204
1205         name_len = ipdata->name_len;
1206         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1207                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1208         bcopy(ipdata->filename,
1209               pmp->iocom.auto_lnk_conn.fs_label,
1210               name_len);
1211         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1212
1213         /*
1214          * Setup LNK_SPAN fields for autoinitiated state machine
1215          */
1216         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1217         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1218         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1219         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1220         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1221         name_len = ipdata->name_len;
1222         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1223                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1224         bcopy(ipdata->filename,
1225               pmp->iocom.auto_lnk_span.fs_label,
1226               name_len);
1227         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1228         hammer2_inode_unlock_ex(pmp->iroot, parent);
1229
1230         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1231 }
1232
1233 static int
1234 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1235 {
1236         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1237         case DMSG_DBG_SHELL:
1238                 /*
1239                  * (non-transaction)
1240                  * Execute shell command (not supported atm)
1241                  */
1242                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1243                 break;
1244         case DMSG_DBG_SHELL | DMSGF_REPLY:
1245                 /*
1246                  * (non-transaction)
1247                  */
1248                 if (msg->aux_data) {
1249                         msg->aux_data[msg->aux_size - 1] = 0;
1250                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1251                 }
1252                 break;
1253         default:
1254                 /*
1255                  * Unsupported message received.  We only need to
1256                  * reply if it's a transaction in order to close our end.
1257                  * Ignore any one-way messages are any further messages
1258                  * associated with the transaction.
1259                  *
1260                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1261                  *       which might be one-way, replying to those would
1262                  *       cause an infinite ping-pong.
1263                  */
1264                 if (msg->any.head.cmd & DMSGF_CREATE)
1265                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1266                 break;
1267         }
1268         return(0);
1269 }
1270
1271 /*
1272  * This function is called after KDMSG has automatically handled processing
1273  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1274  *
1275  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1276  * advertises all available hammer2 super-root volumes.
1277  */
1278 static void
1279 hammer2_autodmsg(kdmsg_msg_t *msg)
1280 {
1281         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1282         hammer2_mount_t *hmp = pmp->hmp;
1283         int copyid;
1284
1285         /*
1286          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1287          * has already processed the reply, we use this calback as a shim
1288          * to know when we can advertise available super-root volumes.
1289          */
1290         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1291             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1292             msg->state == NULL) {
1293                 return;
1294         }
1295
1296         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1297
1298         if (msg->any.head.cmd & DMSGF_CREATE) {
1299                 kprintf("HAMMER2: VOLDATA DUMP\n");
1300
1301                 /*
1302                  * Dump the configuration stored in the volume header
1303                  */
1304                 hammer2_voldata_lock(hmp);
1305                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1306                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1307                                 continue;
1308                         hammer2_volconf_update(pmp, copyid);
1309                 }
1310                 hammer2_voldata_unlock(hmp, 0);
1311         }
1312         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1313             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1314                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1315         }
1316 }
1317
1318 /*
1319  * Volume configuration updates are passed onto the userland service
1320  * daemon via the open LNK_CONN transaction.
1321  */
1322 void
1323 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1324 {
1325         hammer2_mount_t *hmp = pmp->hmp;
1326         kdmsg_msg_t *msg;
1327
1328         /* XXX interlock against connection state termination */
1329         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1330         if (pmp->iocom.conn_state) {
1331                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1332                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1333                                             DMSG_LNK_VOLCONF, NULL, NULL);
1334                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1335                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1336                 msg->any.lnk_volconf.index = index;
1337                 kdmsg_msg_write(msg);
1338         }
1339 }
1340
1341 void
1342 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1343 {
1344         hammer2_chain_t *scan;
1345
1346         --*countp;
1347         if (*countp == 0) {
1348                 kprintf("%*.*s...\n", tab, tab, "");
1349                 return;
1350         }
1351         if (*countp < 0)
1352                 return;
1353         kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p dt=%s refs=%d",
1354                 tab, tab, "",
1355                 chain->index, chain, chain->bref.type, chain->flags,
1356                 chain->core,
1357                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1358                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1359                 chain->next_parent,
1360                 (chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
1361                 chain->refs);
1362         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1363                 kprintf("\n");
1364         else
1365                 kprintf(" {\n");
1366         RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1367                 hammer2_dump_chain(scan, tab + 4, countp);
1368         }
1369         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1370                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1371                         kprintf("%*.*s}(%s)\n", tab, tab, "",
1372                                 chain->data->ipdata.filename);
1373                 else
1374                         kprintf("%*.*s}\n", tab, tab, "");
1375         }
1376 }