sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011-2013 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/nlookup.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/buf.h>
  42 #include <sys/uuid.h>
  43 #include <sys/vfsops.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/socket.h>
  46
  47 #include "hammer2.h"
  48 #include "hammer2_disk.h"
  49 #include "hammer2_mount.h"
  50
  51 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  52
  53 struct hammer2_sync_info {
  54         hammer2_trans_t trans;
  55         int error;
  56         int waitfor;
  57 };
  58
  59 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  60 static struct hammer2_mntlist hammer2_mntlist;
  61 static struct lock hammer2_mntlk;
  62
  63 int hammer2_debug;
  64 int hammer2_cluster_enable = 1;
  65 int hammer2_hardlink_enable = 1;
  66 long hammer2_iod_file_read;
  67 long hammer2_iod_meta_read;
  68 long hammer2_iod_indr_read;
  69 long hammer2_iod_file_write;
  70 long hammer2_iod_meta_write;
  71 long hammer2_iod_indr_write;
  72 long hammer2_iod_fmap_write;
  73 long hammer2_iod_volu_write;
  74 long hammer2_ioa_file_read;
  75 long hammer2_ioa_meta_read;
  76 long hammer2_ioa_indr_read;
  77 long hammer2_ioa_fmap_write;
  78 long hammer2_ioa_file_write;
  79 long hammer2_ioa_meta_write;
  80 long hammer2_ioa_indr_write;
  81 long hammer2_ioa_volu_write;
  82
  83 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
  84
  85 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
  86            &hammer2_debug, 0, "");
  87 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
  88            &hammer2_cluster_enable, 0, "");
  89 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
  90            &hammer2_hardlink_enable, 0, "");
  91 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
  92            &hammer2_iod_file_read, 0, "");
  93 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
  94            &hammer2_iod_meta_read, 0, "");
  95 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
  96            &hammer2_iod_indr_read, 0, "");
  97 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
  98            &hammer2_iod_file_write, 0, "");
  99 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 100            &hammer2_iod_meta_write, 0, "");
 101 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 102            &hammer2_iod_indr_write, 0, "");
 103 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 104            &hammer2_iod_volu_write, 0, "");
 105 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 106            &hammer2_ioa_file_read, 0, "");
 107 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 108            &hammer2_ioa_meta_read, 0, "");
 109 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 110            &hammer2_ioa_indr_read, 0, "");
 111 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 112            &hammer2_ioa_file_write, 0, "");
 113 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 114            &hammer2_ioa_meta_write, 0, "");
 115 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 116            &hammer2_ioa_indr_write, 0, "");
 117 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 118            &hammer2_ioa_volu_write, 0, "");
 119
 120 static int hammer2_vfs_init(struct vfsconf *conf);
 121 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 122                                 struct ucred *cred);
 123 static int hammer2_remount(struct mount *, char *, struct vnode *,
 124                                 struct ucred *);
 125 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 126 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 127 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 128                                 struct ucred *cred);
 129 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 130                                 struct ucred *cred);
 131 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 132 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 133                                 ino_t ino, struct vnode **vpp);
 134 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 135                                 struct fid *fhp, struct vnode **vpp);
 136 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 137 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 138                                 int *exflagsp, struct ucred **credanonp);
 139
 140 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 141 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
 142 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 143
 144 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 145 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 146
 147 /*
 148  * HAMMER2 vfs operations.
 149  */
 150 static struct vfsops hammer2_vfsops = {
 151         .vfs_init       = hammer2_vfs_init,
 152         .vfs_sync       = hammer2_vfs_sync,
 153         .vfs_mount      = hammer2_vfs_mount,
 154         .vfs_unmount    = hammer2_vfs_unmount,
 155         .vfs_root       = hammer2_vfs_root,
 156         .vfs_statfs     = hammer2_vfs_statfs,
 157         .vfs_statvfs    = hammer2_vfs_statvfs,
 158         .vfs_vget       = hammer2_vfs_vget,
 159         .vfs_vptofh     = hammer2_vfs_vptofh,
 160         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 161         .vfs_checkexp   = hammer2_vfs_checkexp
 162 };
 163
 164 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 165
 166 VFS_SET(hammer2_vfsops, hammer2, 0);
 167 MODULE_VERSION(hammer2, 1);
 168
 169 static
 170 int
 171 hammer2_vfs_init(struct vfsconf *conf)
 172 {
 173         int error;
 174
 175         error = 0;
 176
 177         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 178                 error = EINVAL;
 179         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 180                 error = EINVAL;
 181         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 182                 error = EINVAL;
 183
 184         if (error)
 185                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 186
 187         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 188         TAILQ_INIT(&hammer2_mntlist);
 189
 190         return (error);
 191 }
 192
 193 /*
 194  * Mount or remount HAMMER2 fileystem from physical media
 195  *
 196  *      mountroot
 197  *              mp              mount point structure
 198  *              path            NULL
 199  *              data            <unused>
 200  *              cred            <unused>
 201  *
 202  *      mount
 203  *              mp              mount point structure
 204  *              path            path to mount point
 205  *              data            pointer to argument structure in user space
 206  *                      volume  volume path (device@LABEL form)
 207  *                      hflags  user mount flags
 208  *              cred            user credentials
 209  *
 210  * RETURNS:     0       Success
 211  *              !0      error number
 212  */
 213 static
 214 int
 215 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 216                   struct ucred *cred)
 217 {
 218         struct hammer2_mount_info info;
 219         hammer2_pfsmount_t *pmp;
 220         hammer2_mount_t *hmp;
 221         hammer2_key_t lhc;
 222         struct vnode *devvp;
 223         struct nlookupdata nd;
 224         hammer2_chain_t *parent;
 225         hammer2_chain_t *schain;
 226         hammer2_chain_t *rchain;
 227         struct file *fp;
 228         char devstr[MNAMELEN];
 229         size_t size;
 230         size_t done;
 231         char *dev;
 232         char *label;
 233         int ronly = 1;
 234         int create_hmp;
 235         int error;
 236
 237         hmp = NULL;
 238         pmp = NULL;
 239         dev = NULL;
 240         label = NULL;
 241         devvp = NULL;
 242
 243         kprintf("hammer2_mount\n");
 244
 245         if (path == NULL) {
 246                 /*
 247                  * Root mount
 248                  */
 249                 bzero(&info, sizeof(info));
 250                 info.cluster_fd = -1;
 251                 return (EOPNOTSUPP);
 252         } else {
 253                 /*
 254                  * Non-root mount or updating a mount
 255                  */
 256                 error = copyin(data, &info, sizeof(info));
 257                 if (error)
 258                         return (error);
 259
 260                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 261                 if (error)
 262                         return (error);
 263
 264                 /* Extract device and label */
 265                 dev = devstr;
 266                 label = strchr(devstr, '@');
 267                 if (label == NULL ||
 268                     ((label + 1) - dev) > done) {
 269                         return (EINVAL);
 270                 }
 271                 *label = '\0';
 272                 label++;
 273                 if (*label == '\0')
 274                         return (EINVAL);
 275
 276                 if (mp->mnt_flag & MNT_UPDATE) {
 277                         /* Update mount */
 278                         /* HAMMER2 implements NFS export via mountctl */
 279                         hmp = MPTOHMP(mp);
 280                         devvp = hmp->devvp;
 281                         error = hammer2_remount(mp, path, devvp, cred);
 282                         return error;
 283                 }
 284         }
 285
 286         /*
 287          * PFS mount
 288          *
 289          * Lookup name and verify it refers to a block device.
 290          */
 291         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 292         if (error == 0)
 293                 error = nlookup(&nd);
 294         if (error == 0)
 295                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 296         nlookup_done(&nd);
 297
 298         if (error == 0) {
 299                 if (vn_isdisk(devvp, &error))
 300                         error = vfs_mountedon(devvp);
 301         }
 302
 303         /*
 304          * Determine if the device has already been mounted.  After this
 305          * check hmp will be non-NULL if we are doing the second or more
 306          * hammer2 mounts from the same device.
 307          */
 308         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 309         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 310                 if (hmp->devvp == devvp)
 311                         break;
 312         }
 313
 314         /*
 315          * Open the device if this isn't a secondary mount
 316          */
 317         if (hmp) {
 318                 create_hmp = 0;
 319         } else {
 320                 create_hmp = 1;
 321                 if (error == 0 && vcount(devvp) > 0)
 322                         error = EBUSY;
 323
 324                 /*
 325                  * Now open the device
 326                  */
 327                 if (error == 0) {
 328                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 329                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 330                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 331                         if (error == 0) {
 332                                 error = VOP_OPEN(devvp,
 333                                                  ronly ? FREAD : FREAD | FWRITE,
 334                                                  FSCRED, NULL);
 335                         }
 336                         vn_unlock(devvp);
 337                 }
 338                 if (error && devvp) {
 339                         vrele(devvp);
 340                         devvp = NULL;
 341                 }
 342                 if (error) {
 343                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 344                         return error;
 345                 }
 346         }
 347
 348         /*
 349          * Block device opened successfully, finish initializing the
 350          * mount structure.
 351          *
 352          * From this point on we have to call hammer2_unmount() on failure.
 353          */
 354         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 355         mp->mnt_data = (qaddr_t)pmp;
 356         pmp->mp = mp;
 357
 358         spin_init(&pmp->inum_spin);
 359         RB_INIT(&pmp->inum_tree);
 360
 361         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 362         kdmsg_iocom_init(&pmp->iocom, pmp,
 363                          KDMSG_IOCOMF_AUTOCONN |
 364                          KDMSG_IOCOMF_AUTOSPAN |
 365                          KDMSG_IOCOMF_AUTOCIRC,
 366                          pmp->mmsg, hammer2_rcvdmsg);
 367
 368         if (create_hmp) {
 369                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 370                 hmp->ronly = ronly;
 371                 hmp->devvp = devvp;
 372                 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
 373                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 374                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 375         }
 376         ccms_domain_init(&pmp->ccms_dom);
 377         pmp->hmp = hmp;
 378         ++hmp->pmp_count;
 379         lockmgr(&hammer2_mntlk, LK_RELEASE);
 380         kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 381
 382         mp->mnt_flag = MNT_LOCAL;
 383         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 384
 385         if (create_hmp) {
 386                 /*
 387                  * Presetup
 388                  */
 389                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 390                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 391                 TAILQ_INIT(&hmp->transq);
 392
 393                 /*
 394                  * vchain setup. vchain.data is special cased to NULL.
 395                  * vchain.refs is initialized and will never drop to 0.
 396                  */
 397                 hmp->vchain.hmp = hmp;
 398                 hmp->vchain.refs = 1;
 399                 hmp->vchain.data = (void *)&hmp->voldata;
 400                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 401                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 402                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 403                 /* hmp->vchain.u.xxx is left NULL */
 404
 405                 /*
 406                  * Install the volume header
 407                  */
 408                 error = hammer2_install_volume_header(hmp);
 409                 if (error) {
 410                         hammer2_vfs_unmount(mp, MNT_FORCE);
 411                         return error;
 412                 }
 413         }
 414
 415         /*
 416          * required mount structure initializations
 417          */
 418         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 419         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 420
 421         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 422         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 423
 424         /*
 425          * Optional fields
 426          */
 427         mp->mnt_iosize_max = MAXPHYS;
 428
 429         /*
 430          * First locate the super-root inode, which is key 0 relative to the
 431          * volume header's blockset.
 432          *
 433          * Then locate the root inode by scanning the directory keyspace
 434          * represented by the label.
 435          */
 436         if (create_hmp) {
 437                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 438                 schain = hammer2_chain_lookup(&parent,
 439                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 440                 hammer2_chain_lookup_done(parent);
 441                 if (schain == NULL) {
 442                         kprintf("hammer2_mount: invalid super-root\n");
 443                         hammer2_vfs_unmount(mp, MNT_FORCE);
 444                         return EINVAL;
 445                 }
 446                 hammer2_chain_ref(schain);      /* for hmp->schain */
 447                 hmp->schain = schain;           /* left locked for inode_get */
 448                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 449                 hammer2_inode_ref(hmp->sroot);       /* for hmp->sroot */
 450                 hammer2_inode_unlock_ex(hmp->sroot); /* eats schain lock */
 451         } else {
 452                 schain = hmp->schain;
 453         }
 454
 455         /*
 456          * schain only has 1 ref now for its hmp->schain assignment.
 457          * Setup for lookup (which will lock it).
 458          */
 459         parent = hammer2_chain_lookup_init(schain, 0);
 460         lhc = hammer2_dirhash(label, strlen(label));
 461         rchain = hammer2_chain_lookup(&parent,
 462                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 463                                       0);
 464         while (rchain) {
 465                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 466                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 467                         break;
 468                 }
 469                 rchain = hammer2_chain_next(&parent, rchain,
 470                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 471                                             0);
 472         }
 473         hammer2_chain_lookup_done(parent);
 474         if (rchain == NULL) {
 475                 kprintf("hammer2_mount: PFS label not found\n");
 476                 hammer2_vfs_unmount(mp, MNT_FORCE);
 477                 return EINVAL;
 478         }
 479         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 480                 hammer2_chain_unlock(rchain);
 481                 kprintf("hammer2_mount: PFS label already mounted!\n");
 482                 hammer2_vfs_unmount(mp, MNT_FORCE);
 483                 return EBUSY;
 484         }
 485         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 486
 487         /*
 488          * NOTE: *_get() integrates chain's lock into the inode lock.
 489          */
 490         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 491         pmp->rchain = rchain;                   /* left held & unlocked */
 492         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 493         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 494         hammer2_inode_unlock_ex(pmp->iroot);    /* iroot & its chain */
 495
 496         kprintf("iroot %p\n", pmp->iroot);
 497
 498         /*
 499          * Ref the cluster management messaging descriptor.  The mount
 500          * program deals with the other end of the communications pipe.
 501          */
 502         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 503         if (fp == NULL) {
 504                 kprintf("hammer2_mount: bad cluster_fd!\n");
 505                 hammer2_vfs_unmount(mp, MNT_FORCE);
 506                 return EBADF;
 507         }
 508         hammer2_cluster_reconnect(pmp, fp);
 509
 510         /*
 511          * Finish setup
 512          */
 513         vfs_getnewfsid(mp);
 514         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 515         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 516         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 517
 518         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 519         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 520         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 521         copyinstr(path, mp->mnt_stat.f_mntonname,
 522                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 523                   &size);
 524
 525         /*
 526          * Initial statfs to prime mnt_stat.
 527          */
 528         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 529
 530         return 0;
 531 }
 532
 533 static
 534 int
 535 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 536                 struct ucred *cred)
 537 {
 538         return (0);
 539 }
 540
 541 static
 542 int
 543 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 544 {
 545         hammer2_pfsmount_t *pmp;
 546         hammer2_mount_t *hmp;
 547         int flags;
 548         int error = 0;
 549         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 550         int dumpcnt;
 551         struct vnode *devvp;
 552
 553         pmp = MPTOPMP(mp);
 554         hmp = pmp->hmp;
 555         flags = 0;
 556
 557         if (mntflags & MNT_FORCE)
 558                 flags |= FORCECLOSE;
 559
 560         hammer2_mount_exlock(hmp);
 561
 562         /*
 563          * If mount initialization proceeded far enough we must flush
 564          * its vnodes.
 565          */
 566         if (pmp->iroot)
 567                 error = vflush(mp, 0, flags);
 568
 569         if (error)
 570                 return error;
 571
 572         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 573         --hmp->pmp_count;
 574         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 575
 576         /*
 577          * Flush any left over chains.  The voldata lock is only used
 578          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 579          */
 580         hammer2_voldata_lock(hmp);
 581         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 582                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 583                 hammer2_voldata_unlock(hmp, 0);
 584                 hammer2_vfs_sync(mp, MNT_WAIT);
 585         } else {
 586                 hammer2_voldata_unlock(hmp, 0);
 587         }
 588         if (hmp->pmp_count == 0) {
 589                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 590                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 591                         kprintf("hammer2_unmount: chains left over after "
 592                                 "final sync\n");
 593                         if (hammer2_debug & 0x0010)
 594                                 Debugger("entered debugger");
 595                 }
 596         }
 597
 598         /*
 599          * Cleanup the root and super-root chain elements (which should be
 600          * clean).
 601          */
 602         if (pmp->iroot) {
 603                 hammer2_inode_lock_ex(pmp->iroot);
 604                 hammer2_inode_put(pmp->iroot);
 605                 /* lock destroyed by the put */
 606 #if REPORT_REFS_ERRORS
 607                 if (pmp->iroot->refs != 1)
 608                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 609                                 pmp->iroot, pmp->iroot->refs);
 610 #else
 611                 KKASSERT(pmp->iroot->refs == 1);
 612 #endif
 613                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 614                 pmp->iroot = NULL;
 615         }
 616         if (pmp->rchain) {
 617                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 618 #if REPORT_REFS_ERRORS
 619                 if (pmp->rchain->refs != 1)
 620                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 621                                 pmp->rchain, pmp->rchain->refs);
 622 #else
 623                 KKASSERT(pmp->rchain->refs == 1);
 624 #endif
 625                 hammer2_chain_drop(pmp->rchain);
 626                 pmp->rchain = NULL;
 627         }
 628         ccms_domain_uninit(&pmp->ccms_dom);
 629
 630         /*
 631          * Kill cluster controller
 632          */
 633         kdmsg_iocom_uninit(&pmp->iocom);
 634
 635         /*
 636          * If no PFS's left drop the master hammer2_mount for the device.
 637          */
 638         if (hmp->pmp_count == 0) {
 639                 if (hmp->sroot) {
 640                         hammer2_inode_drop(hmp->sroot);
 641                         hmp->sroot = NULL;
 642                 }
 643                 if (hmp->schain) {
 644 #if REPORT_REFS_ERRORS
 645                         if (hmp->schain->refs != 1)
 646                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 647                                         hmp->schain, hmp->schain->refs);
 648 #else
 649                         KKASSERT(hmp->schain->refs == 1);
 650 #endif
 651                         hammer2_chain_drop(hmp->schain);
 652                         hmp->schain = NULL;
 653                 }
 654
 655                 /*
 656                  * Finish up with the device vnode
 657                  */
 658                 if ((devvp = hmp->devvp) != NULL) {
 659                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 660                         hmp->devvp = NULL;
 661                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 662                         vrele(devvp);
 663                         devvp = NULL;
 664                 }
 665         }
 666         hammer2_mount_unlock(hmp);
 667
 668         dumpcnt = 200;
 669         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 670
 671         /*
 672          * Final drop of embedded volume root chain to clean up
 673          * vchain.core (vchain structure is not flagged ALLOCATED
 674          * so it is cleaned out and then left).
 675          */
 676         hammer2_chain_drop(&hmp->vchain);
 677
 678         pmp->mp = NULL;
 679         pmp->hmp = NULL;
 680         mp->mnt_data = NULL;
 681
 682         kmalloc_destroy(&pmp->mmsg);
 683
 684         kfree(pmp, M_HAMMER2);
 685         if (hmp->pmp_count == 0) {
 686                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 687                 kmalloc_destroy(&hmp->minode);
 688                 kmalloc_destroy(&hmp->mchain);
 689                 kfree(hmp, M_HAMMER2);
 690         }
 691         lockmgr(&hammer2_mntlk, LK_RELEASE);
 692         return (error);
 693 }
 694
 695 static
 696 int
 697 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 698              ino_t ino, struct vnode **vpp)
 699 {
 700         kprintf("hammer2_vget\n");
 701         return (EOPNOTSUPP);
 702 }
 703
 704 static
 705 int
 706 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 707 {
 708         hammer2_pfsmount_t *pmp;
 709         hammer2_mount_t *hmp;
 710         int error;
 711         struct vnode *vp;
 712
 713         pmp = MPTOPMP(mp);
 714         hmp = pmp->hmp;
 715         hammer2_mount_exlock(hmp);
 716         if (pmp->iroot == NULL) {
 717                 *vpp = NULL;
 718                 error = EINVAL;
 719         } else {
 720                 hammer2_inode_lock_sh(pmp->iroot);
 721                 vp = hammer2_igetv(pmp->iroot, &error);
 722                 hammer2_inode_unlock_sh(pmp->iroot);
 723                 *vpp = vp;
 724                 if (vp == NULL)
 725                         kprintf("vnodefail\n");
 726         }
 727         hammer2_mount_unlock(hmp);
 728
 729         return (error);
 730 }
 731
 732 /*
 733  * Filesystem status
 734  *
 735  * XXX incorporate ipdata->inode_quota and data_quota
 736  */
 737 static
 738 int
 739 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 740 {
 741         hammer2_pfsmount_t *pmp;
 742         hammer2_mount_t *hmp;
 743
 744         pmp = MPTOPMP(mp);
 745         hmp = MPTOHMP(mp);
 746
 747         mp->mnt_stat.f_files = pmp->inode_count;
 748         mp->mnt_stat.f_ffree = 0;
 749         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 750         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 751                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 752         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 753
 754         *sbp = mp->mnt_stat;
 755         return (0);
 756 }
 757
 758 static
 759 int
 760 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 761 {
 762         hammer2_pfsmount_t *pmp;
 763         hammer2_mount_t *hmp;
 764
 765         pmp = MPTOPMP(mp);
 766         hmp = MPTOHMP(mp);
 767
 768         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 769         mp->mnt_vstat.f_files = pmp->inode_count;
 770         mp->mnt_vstat.f_ffree = 0;
 771         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 772         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 773                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 774         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 775
 776         *sbp = mp->mnt_vstat;
 777         return (0);
 778 }
 779
 780 /*
 781  * Sync the entire filesystem; this is called from the filesystem syncer
 782  * process periodically and whenever a user calls sync(1) on the hammer
 783  * mountpoint.
 784  *
 785  * Currently is actually called from the syncer! \o/
 786  *
 787  * This task will have to snapshot the state of the dirty inode chain.
 788  * From that, it will have to make sure all of the inodes on the dirty
 789  * chain have IO initiated. We make sure that io is initiated for the root
 790  * block.
 791  *
 792  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 793  *
 794  * THINKS: side A vs side B, to have sync not stall all I/O?
 795  */
 796 static
 797 int
 798 hammer2_vfs_sync(struct mount *mp, int waitfor)
 799 {
 800         struct hammer2_sync_info info;
 801         hammer2_mount_t *hmp;
 802         int flags;
 803         int error;
 804         int i;
 805 #if 0
 806         int dumpcnt;
 807 #endif
 808
 809         hmp = MPTOHMP(mp);
 810 #if 0
 811         if ((waitfor & MNT_LAZY) == 0) {
 812                 dumpcnt = 50;
 813                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 814         }
 815 #endif
 816
 817         flags = VMSC_GETVP;
 818         if (waitfor & MNT_LAZY)
 819                 flags |= VMSC_ONEPASS;
 820
 821         hammer2_trans_init(hmp, &info.trans, HAMMER2_TRANS_ISFLUSH);
 822         info.error = 0;
 823         info.waitfor = MNT_NOWAIT;
 824         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 825                       hammer2_sync_scan1,
 826                       hammer2_sync_scan2, &info);
 827         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 828                 info.waitfor = waitfor;
 829                     vmntvnodescan(mp, flags,
 830                                   hammer2_sync_scan1,
 831                                   hammer2_sync_scan2, &info);
 832
 833         }
 834 #if 0
 835         if (waitfor == MNT_WAIT) {
 836                 /* XXX */
 837         } else {
 838                 /* XXX */
 839         }
 840 #endif
 841         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 842         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 843                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 844                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 845         }
 846         hammer2_chain_unlock(&hmp->vchain);
 847
 848         error = 0;
 849
 850         /*
 851          * We can't safely flush the volume header until we have
 852          * flushed any device buffers which have built up.
 853          */
 854 #if 0
 855         if ((waitfor & MNT_LAZY) == 0) {
 856                 waitfor = MNT_NOWAIT;
 857                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 858                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 859                 vn_unlock(hmp->devvp);
 860         }
 861 #endif
 862         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 863         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 864         vn_unlock(hmp->devvp);
 865
 866         /*
 867          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 868          * volume header needs synchronization via hmp->volsync.
 869          *
 870          * XXX synchronize the flag & data with only this flush XXX
 871          */
 872         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 873                 struct buf *bp;
 874
 875                 /*
 876                  * Synchronize the disk before flushing the volume
 877                  * header.
 878                  */
 879                 bp = getpbuf(NULL);
 880                 bp->b_bio1.bio_offset = 0;
 881                 bp->b_bufsize = 0;
 882                 bp->b_bcount = 0;
 883                 bp->b_cmd = BUF_CMD_FLUSH;
 884                 bp->b_bio1.bio_done = biodone_sync;
 885                 bp->b_bio1.bio_flags |= BIO_SYNC;
 886                 vn_strategy(hmp->devvp, &bp->b_bio1);
 887                 biowait(&bp->b_bio1, "h2vol");
 888                 relpbuf(bp, NULL);
 889
 890                 /*
 891                  * Then we can safely flush the version of the volume header
 892                  * synchronized by the flush code.
 893                  */
 894                 i = hmp->volhdrno + 1;
 895                 if (i >= HAMMER2_NUM_VOLHDRS)
 896                         i = 0;
 897                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 898                     hmp->volsync.volu_size) {
 899                         i = 0;
 900                 }
 901                 kprintf("sync volhdr %d %jd\n",
 902                         i, (intmax_t)hmp->volsync.volu_size);
 903                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 904                             HAMMER2_PBUFSIZE, 0, 0);
 905                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 906                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 907                 bawrite(bp);
 908                 hmp->volhdrno = i;
 909         }
 910         hammer2_trans_done(&info.trans);
 911         return (error);
 912 }
 913
 914 /*
 915  * Sync passes.
 916  *
 917  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 918  *       won't flush on those flags.  The syncer code above will do a
 919  *       general meta-data flush globally that will catch these flags.
 920  */
 921 static int
 922 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 923 {
 924         hammer2_inode_t *ip;
 925
 926         ip = VTOI(vp);
 927         if (vp->v_type == VNON || ip == NULL ||
 928             ((ip->flags & (HAMMER2_INODE_MODIFIED |
 929                            HAMMER2_INODE_DIRTYEMBED)) == 0 &&
 930              RB_EMPTY(&vp->v_rbdirty_tree))) {
 931                 return(-1);
 932         }
 933         return(0);
 934 }
 935
 936 static int
 937 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 938 {
 939         struct hammer2_sync_info *info = data;
 940         hammer2_inode_t *ip;
 941         int error;
 942
 943         ip = VTOI(vp);
 944         if (vp->v_type == VNON || vp->v_type == VBAD ||
 945             ((ip->flags & (HAMMER2_INODE_MODIFIED |
 946                            HAMMER2_INODE_DIRTYEMBED)) == 0 &&
 947              RB_EMPTY(&vp->v_rbdirty_tree))) {
 948                 return(0);
 949         }
 950
 951         /*
 952          * VOP_FSYNC will start a new transaction so replicate some code
 953          * here to do it inline (see hammer2_vop_fsync()).
 954          */
 955         hammer2_inode_lock_ex(ip);
 956         if (ip->vp)
 957                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
 958         if (ip->flags & HAMMER2_INODE_DIRTYEMBED) {
 959                 atomic_clear_int(&ip->flags, HAMMER2_INODE_DIRTYEMBED);
 960                 atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED);
 961                 hammer2_chain_modify(&info->trans, ip->chain, 0);
 962         }
 963         hammer2_chain_flush(&info->trans, ip->chain);
 964         hammer2_inode_unlock_ex(ip);
 965         error = 0;
 966 #if 0
 967         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 968 #endif
 969         if (error)
 970                 info->error = error;
 971         return(0);
 972 }
 973
 974 static
 975 int
 976 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 977 {
 978         return (0);
 979 }
 980
 981 static
 982 int
 983 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 984                struct fid *fhp, struct vnode **vpp)
 985 {
 986         return (0);
 987 }
 988
 989 static
 990 int
 991 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 992                  int *exflagsp, struct ucred **credanonp)
 993 {
 994         return (0);
 995 }
 996
 997 /*
 998  * Support code for hammer2_mount().  Read, verify, and install the volume
 999  * header into the HMP
1000  *
1001  * XXX read four volhdrs and use the one with the highest TID whos CRC
1002  *     matches.
1003  *
1004  * XXX check iCRCs.
1005  *
1006  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1007  *     nonexistant locations.
1008  *
1009  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1010  */
1011 static
1012 int
1013 hammer2_install_volume_header(hammer2_mount_t *hmp)
1014 {
1015         hammer2_volume_data_t *vd;
1016         struct buf *bp;
1017         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1018         int error_reported;
1019         int error;
1020         int valid;
1021         int i;
1022
1023         error_reported = 0;
1024         error = 0;
1025         valid = 0;
1026         bp = NULL;
1027
1028         /*
1029          * There are up to 4 copies of the volume header (syncs iterate
1030          * between them so there is no single master).  We don't trust the
1031          * volu_size field so we don't know precisely how large the filesystem
1032          * is, so depend on the OS to return an error if we go beyond the
1033          * block device's EOF.
1034          */
1035         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1036                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1037                               HAMMER2_VOLUME_BYTES, &bp);
1038                 if (error) {
1039                         brelse(bp);
1040                         bp = NULL;
1041                         continue;
1042                 }
1043
1044                 vd = (struct hammer2_volume_data *) bp->b_data;
1045                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1046                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1047                         brelse(bp);
1048                         bp = NULL;
1049                         continue;
1050                 }
1051
1052                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1053                         /* XXX: Reversed-endianness filesystem */
1054                         kprintf("hammer2: reverse-endian filesystem detected");
1055                         brelse(bp);
1056                         bp = NULL;
1057                         continue;
1058                 }
1059
1060                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1061                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1062                                       HAMMER2_VOLUME_ICRC0_SIZE);
1063                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1064                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1065                                        HAMMER2_VOLUME_ICRC1_SIZE);
1066                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1067                         kprintf("hammer2 volume header crc "
1068                                 "mismatch copy #%d %08x/%08x\n",
1069                                 i, crc0, crc);
1070                         error_reported = 1;
1071                         brelse(bp);
1072                         bp = NULL;
1073                         continue;
1074                 }
1075                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1076                         valid = 1;
1077                         hmp->voldata = *vd;
1078                         hmp->volhdrno = i;
1079                 }
1080                 brelse(bp);
1081                 bp = NULL;
1082         }
1083         if (valid) {
1084                 hmp->volsync = hmp->voldata;
1085                 error = 0;
1086                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1087                         kprintf("hammer2: using volume header #%d\n",
1088                                 hmp->volhdrno);
1089                 }
1090         } else {
1091                 error = EINVAL;
1092                 kprintf("hammer2: no valid volume headers found!\n");
1093         }
1094         return (error);
1095 }
1096
1097 /*
1098  * Reconnect using the passed file pointer.  The caller must ref the
1099  * fp for us.
1100  */
1101 void
1102 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1103 {
1104         hammer2_inode_data_t *ipdata;
1105         size_t name_len;
1106
1107         /*
1108          * Closes old comm descriptor, kills threads, cleans up
1109          * states, then installs the new descriptor and creates
1110          * new threads.
1111          */
1112         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1113
1114         /*
1115          * Setup LNK_CONN fields for autoinitiated state machine
1116          */
1117         hammer2_inode_lock_ex(pmp->iroot);
1118         ipdata = &pmp->iroot->chain->data->ipdata;
1119         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1120         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1121         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1122         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1123         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1124         hammer2_inode_unlock_ex(pmp->iroot);
1125
1126         /*
1127          * Filter adjustment.  Clients do not need visibility into other
1128          * clients (otherwise millions of clients would present a serious
1129          * problem).  The fs_label also serves to restrict the namespace.
1130          */
1131         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1132         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1133         switch (ipdata->pfs_type) {
1134         case DMSG_PFSTYPE_CLIENT:
1135                 pmp->iocom.auto_lnk_conn.peer_mask &=
1136                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1137                 break;
1138         default:
1139                 break;
1140         }
1141
1142         name_len = ipdata->name_len;
1143         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1144                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1145         bcopy(ipdata->filename,
1146               pmp->iocom.auto_lnk_conn.fs_label,
1147               name_len);
1148         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1149
1150         /*
1151          * Setup LNK_SPAN fields for autoinitiated state machine
1152          */
1153         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1154         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1155         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1156         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1157         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1158         name_len = ipdata->name_len;
1159         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1160                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1161         bcopy(ipdata->filename,
1162               pmp->iocom.auto_lnk_span.fs_label,
1163               name_len);
1164         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1165
1166         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1167 }
1168
1169 static int
1170 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1171 {
1172         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1173         case DMSG_DBG_SHELL:
1174                 /*
1175                  * (non-transaction)
1176                  * Execute shell command (not supported atm)
1177                  */
1178                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1179                 break;
1180         case DMSG_DBG_SHELL | DMSGF_REPLY:
1181                 /*
1182                  * (non-transaction)
1183                  */
1184                 if (msg->aux_data) {
1185                         msg->aux_data[msg->aux_size - 1] = 0;
1186                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1187                 }
1188                 break;
1189         default:
1190                 /*
1191                  * Unsupported message received.  We only need to
1192                  * reply if it's a transaction in order to close our end.
1193                  * Ignore any one-way messages are any further messages
1194                  * associated with the transaction.
1195                  *
1196                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1197                  *       which might be one-way, replying to those would
1198                  *       cause an infinite ping-pong.
1199                  */
1200                 if (msg->any.head.cmd & DMSGF_CREATE)
1201                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1202                 break;
1203         }
1204         return(0);
1205 }
1206
1207 /*
1208  * This function is called after KDMSG has automatically handled processing
1209  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1210  *
1211  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1212  * advertises all available hammer2 super-root volumes.
1213  */
1214 static void
1215 hammer2_autodmsg(kdmsg_msg_t *msg)
1216 {
1217         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1218         hammer2_mount_t *hmp = pmp->hmp;
1219         int copyid;
1220
1221         /*
1222          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1223          * has already processed the reply, we use this calback as a shim
1224          * to know when we can advertise available super-root volumes.
1225          */
1226         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1227             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1228             msg->state == NULL) {
1229                 return;
1230         }
1231
1232         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1233
1234         if (msg->any.head.cmd & DMSGF_CREATE) {
1235                 kprintf("HAMMER2: VOLDATA DUMP\n");
1236
1237                 /*
1238                  * Dump the configuration stored in the volume header
1239                  */
1240                 hammer2_voldata_lock(hmp);
1241                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1242                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1243                                 continue;
1244                         hammer2_volconf_update(pmp, copyid);
1245                 }
1246                 hammer2_voldata_unlock(hmp, 0);
1247         }
1248         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1249             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1250                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1251         }
1252 }
1253
1254 /*
1255  * Volume configuration updates are passed onto the userland service
1256  * daemon via the open LNK_CONN transaction.
1257  */
1258 void
1259 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1260 {
1261         hammer2_mount_t *hmp = pmp->hmp;
1262         kdmsg_msg_t *msg;
1263
1264         /* XXX interlock against connection state termination */
1265         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1266         if (pmp->iocom.conn_state) {
1267                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1268                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1269                                             DMSG_LNK_VOLCONF, NULL, NULL);
1270                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1271                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1272                 msg->any.lnk_volconf.index = index;
1273                 kdmsg_msg_write(msg);
1274         }
1275 }
1276
1277 void
1278 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1279 {
1280         hammer2_chain_t *scan;
1281
1282         --*countp;
1283         if (*countp == 0) {
1284                 kprintf("%*.*s...\n", tab, tab, "");
1285                 return;
1286         }
1287         if (*countp < 0)
1288                 return;
1289         kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p refs=%d",
1290                 tab, tab, "",
1291                 chain->index, chain, chain->bref.type, chain->flags,
1292                 chain->core,
1293                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1294                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1295                 chain->duplink, chain->refs);
1296         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1297                 kprintf("\n");
1298         else
1299                 kprintf(" {\n");
1300         RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1301                 hammer2_dump_chain(scan, tab + 4, countp);
1302         }
1303         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1304                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1305                         kprintf("%*.*s}(%s)\n", tab, tab, "",
1306                                 chain->data->ipdata.filename);
1307                 else
1308                         kprintf("%*.*s}\n", tab, tab, "");
1309         }
1310 }