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                 hmp->vchain.delete_tid = HAMMER2_MAX_TID;
 403                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 404                 /* hmp->vchain.u.xxx is left NULL */
 405
 406                 /*
 407                  * Install the volume header
 408                  */
 409                 error = hammer2_install_volume_header(hmp);
 410                 if (error) {
 411                         hammer2_vfs_unmount(mp, MNT_FORCE);
 412                         return error;
 413                 }
 414         }
 415
 416         /*
 417          * required mount structure initializations
 418          */
 419         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 420         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 421
 422         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 423         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 424
 425         /*
 426          * Optional fields
 427          */
 428         mp->mnt_iosize_max = MAXPHYS;
 429
 430         /*
 431          * First locate the super-root inode, which is key 0 relative to the
 432          * volume header's blockset.
 433          *
 434          * Then locate the root inode by scanning the directory keyspace
 435          * represented by the label.
 436          */
 437         if (create_hmp) {
 438                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 439                 schain = hammer2_chain_lookup(&parent,
 440                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 441                 hammer2_chain_lookup_done(parent);
 442                 if (schain == NULL) {
 443                         kprintf("hammer2_mount: invalid super-root\n");
 444                         hammer2_vfs_unmount(mp, MNT_FORCE);
 445                         return EINVAL;
 446                 }
 447                 hammer2_chain_ref(schain);      /* for hmp->schain */
 448                 hmp->schain = schain;           /* left locked for inode_get */
 449                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 450                 hammer2_inode_ref(hmp->sroot);       /* for hmp->sroot */
 451                 hammer2_inode_unlock_ex(hmp->sroot, schain);
 452         } else {
 453                 schain = hmp->schain;
 454         }
 455
 456         /*
 457          * schain only has 1 ref now for its hmp->schain assignment.
 458          * Setup for lookup (which will lock it).
 459          */
 460         parent = hammer2_chain_lookup_init(schain, 0);
 461         lhc = hammer2_dirhash(label, strlen(label));
 462         rchain = hammer2_chain_lookup(&parent,
 463                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 464                                       0);
 465         while (rchain) {
 466                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 467                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 468                         break;
 469                 }
 470                 rchain = hammer2_chain_next(&parent, rchain,
 471                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 472                                             0);
 473         }
 474         hammer2_chain_lookup_done(parent);
 475         if (rchain == NULL) {
 476                 kprintf("hammer2_mount: PFS label not found\n");
 477                 hammer2_vfs_unmount(mp, MNT_FORCE);
 478                 return EINVAL;
 479         }
 480         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 481                 hammer2_chain_unlock(rchain);
 482                 kprintf("hammer2_mount: PFS label already mounted!\n");
 483                 hammer2_vfs_unmount(mp, MNT_FORCE);
 484                 return EBUSY;
 485         }
 486         if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 487                 kprintf("hammer2_mount: PFS label currently recycling\n");
 488                 hammer2_vfs_unmount(mp, MNT_FORCE);
 489                 return EBUSY;
 490         }
 491
 492         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 493
 494         /*
 495          * NOTE: *_get() integrates chain's lock into the inode lock.
 496          */
 497         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 498         pmp->rchain = rchain;                   /* left held & unlocked */
 499         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 500         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 501         hammer2_inode_unlock_ex(pmp->iroot, rchain);
 502
 503         kprintf("iroot %p\n", pmp->iroot);
 504
 505         /*
 506          * Ref the cluster management messaging descriptor.  The mount
 507          * program deals with the other end of the communications pipe.
 508          */
 509         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 510         if (fp == NULL) {
 511                 kprintf("hammer2_mount: bad cluster_fd!\n");
 512                 hammer2_vfs_unmount(mp, MNT_FORCE);
 513                 return EBADF;
 514         }
 515         hammer2_cluster_reconnect(pmp, fp);
 516
 517         /*
 518          * Finish setup
 519          */
 520         vfs_getnewfsid(mp);
 521         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 522         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 523         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 524
 525         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 526         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 527         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 528         copyinstr(path, mp->mnt_stat.f_mntonname,
 529                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 530                   &size);
 531
 532         /*
 533          * Initial statfs to prime mnt_stat.
 534          */
 535         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 536
 537         return 0;
 538 }
 539
 540 static
 541 int
 542 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 543                 struct ucred *cred)
 544 {
 545         return (0);
 546 }
 547
 548 static
 549 int
 550 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 551 {
 552         hammer2_pfsmount_t *pmp;
 553         hammer2_mount_t *hmp;
 554         int flags;
 555         int error = 0;
 556         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 557         int dumpcnt;
 558         struct vnode *devvp;
 559
 560         pmp = MPTOPMP(mp);
 561         hmp = pmp->hmp;
 562         flags = 0;
 563
 564         if (mntflags & MNT_FORCE)
 565                 flags |= FORCECLOSE;
 566
 567         hammer2_mount_exlock(hmp);
 568
 569         /*
 570          * If mount initialization proceeded far enough we must flush
 571          * its vnodes.
 572          */
 573         if (pmp->iroot)
 574                 error = vflush(mp, 0, flags);
 575
 576         if (error) {
 577                 hammer2_mount_unlock(hmp);
 578                 return error;
 579         }
 580
 581         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 582         --hmp->pmp_count;
 583         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 584
 585         /*
 586          * Flush any left over chains.  The voldata lock is only used
 587          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 588          */
 589         hammer2_voldata_lock(hmp);
 590         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 591                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 592                 hammer2_voldata_unlock(hmp, 0);
 593                 hammer2_vfs_sync(mp, MNT_WAIT);
 594         } else {
 595                 hammer2_voldata_unlock(hmp, 0);
 596         }
 597         if (hmp->pmp_count == 0) {
 598                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 599                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 600                         kprintf("hammer2_unmount: chains left over after "
 601                                 "final sync\n");
 602                         if (hammer2_debug & 0x0010)
 603                                 Debugger("entered debugger");
 604                 }
 605         }
 606
 607         /*
 608          * Cleanup the root and super-root chain elements (which should be
 609          * clean).
 610          */
 611         if (pmp->iroot) {
 612 #if REPORT_REFS_ERRORS
 613                 if (pmp->iroot->refs != 1)
 614                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 615                                 pmp->iroot, pmp->iroot->refs);
 616 #else
 617                 KKASSERT(pmp->iroot->refs == 1);
 618 #endif
 619                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 620                 pmp->iroot = NULL;
 621         }
 622         if (pmp->rchain) {
 623                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 624 #if REPORT_REFS_ERRORS
 625                 if (pmp->rchain->refs != 1)
 626                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 627                                 pmp->rchain, pmp->rchain->refs);
 628 #else
 629                 KKASSERT(pmp->rchain->refs == 1);
 630 #endif
 631                 hammer2_chain_drop(pmp->rchain);
 632                 pmp->rchain = NULL;
 633         }
 634         ccms_domain_uninit(&pmp->ccms_dom);
 635
 636         /*
 637          * Kill cluster controller
 638          */
 639         kdmsg_iocom_uninit(&pmp->iocom);
 640
 641         /*
 642          * If no PFS's left drop the master hammer2_mount for the device.
 643          */
 644         if (hmp->pmp_count == 0) {
 645                 if (hmp->sroot) {
 646                         hammer2_inode_drop(hmp->sroot);
 647                         hmp->sroot = NULL;
 648                 }
 649                 if (hmp->schain) {
 650 #if REPORT_REFS_ERRORS
 651                         if (hmp->schain->refs != 1)
 652                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 653                                         hmp->schain, hmp->schain->refs);
 654 #else
 655                         KKASSERT(hmp->schain->refs == 1);
 656 #endif
 657                         hammer2_chain_drop(hmp->schain);
 658                         hmp->schain = NULL;
 659                 }
 660
 661                 /*
 662                  * Finish up with the device vnode
 663                  */
 664                 if ((devvp = hmp->devvp) != NULL) {
 665                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 666                         hmp->devvp = NULL;
 667                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 668                         vrele(devvp);
 669                         devvp = NULL;
 670                 }
 671
 672                 /*
 673                  * Final drop of embedded volume root chain to clean up
 674                  * vchain.core (vchain structure is not flagged ALLOCATED
 675                  * so it is cleaned out and then left).
 676                  */
 677                 dumpcnt = 50;
 678                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 679                 hammer2_mount_unlock(hmp);
 680                 hammer2_chain_drop(&hmp->vchain);
 681         } else {
 682                 hammer2_mount_unlock(hmp);
 683         }
 684
 685         pmp->mp = NULL;
 686         pmp->hmp = NULL;
 687         mp->mnt_data = NULL;
 688
 689         kmalloc_destroy(&pmp->mmsg);
 690
 691         kfree(pmp, M_HAMMER2);
 692         if (hmp->pmp_count == 0) {
 693                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 694                 kmalloc_destroy(&hmp->minode);
 695                 kmalloc_destroy(&hmp->mchain);
 696                 kfree(hmp, M_HAMMER2);
 697         }
 698         lockmgr(&hammer2_mntlk, LK_RELEASE);
 699         return (error);
 700 }
 701
 702 static
 703 int
 704 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 705              ino_t ino, struct vnode **vpp)
 706 {
 707         kprintf("hammer2_vget\n");
 708         return (EOPNOTSUPP);
 709 }
 710
 711 static
 712 int
 713 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 714 {
 715         hammer2_pfsmount_t *pmp;
 716         hammer2_mount_t *hmp;
 717         hammer2_chain_t *parent;
 718         int error;
 719         struct vnode *vp;
 720
 721         pmp = MPTOPMP(mp);
 722         hmp = pmp->hmp;
 723         hammer2_mount_exlock(hmp);
 724         if (pmp->iroot == NULL) {
 725                 *vpp = NULL;
 726                 error = EINVAL;
 727         } else {
 728                 parent = hammer2_inode_lock_sh(pmp->iroot);
 729                 vp = hammer2_igetv(pmp->iroot, &error);
 730                 hammer2_inode_unlock_sh(pmp->iroot, parent);
 731                 *vpp = vp;
 732                 if (vp == NULL)
 733                         kprintf("vnodefail\n");
 734         }
 735         hammer2_mount_unlock(hmp);
 736
 737         return (error);
 738 }
 739
 740 /*
 741  * Filesystem status
 742  *
 743  * XXX incorporate ipdata->inode_quota and data_quota
 744  */
 745 static
 746 int
 747 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 748 {
 749         hammer2_pfsmount_t *pmp;
 750         hammer2_mount_t *hmp;
 751
 752         pmp = MPTOPMP(mp);
 753         hmp = MPTOHMP(mp);
 754
 755         mp->mnt_stat.f_files = pmp->inode_count;
 756         mp->mnt_stat.f_ffree = 0;
 757         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 758         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 759                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 760         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 761
 762         *sbp = mp->mnt_stat;
 763         return (0);
 764 }
 765
 766 static
 767 int
 768 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 769 {
 770         hammer2_pfsmount_t *pmp;
 771         hammer2_mount_t *hmp;
 772
 773         pmp = MPTOPMP(mp);
 774         hmp = MPTOHMP(mp);
 775
 776         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 777         mp->mnt_vstat.f_files = pmp->inode_count;
 778         mp->mnt_vstat.f_ffree = 0;
 779         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 780         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 781                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 782         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 783
 784         *sbp = mp->mnt_vstat;
 785         return (0);
 786 }
 787
 788 /*
 789  * Sync the entire filesystem; this is called from the filesystem syncer
 790  * process periodically and whenever a user calls sync(1) on the hammer
 791  * mountpoint.
 792  *
 793  * Currently is actually called from the syncer! \o/
 794  *
 795  * This task will have to snapshot the state of the dirty inode chain.
 796  * From that, it will have to make sure all of the inodes on the dirty
 797  * chain have IO initiated. We make sure that io is initiated for the root
 798  * block.
 799  *
 800  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 801  *
 802  * THINKS: side A vs side B, to have sync not stall all I/O?
 803  */
 804 static
 805 int
 806 hammer2_vfs_sync(struct mount *mp, int waitfor)
 807 {
 808         struct hammer2_sync_info info;
 809         hammer2_mount_t *hmp;
 810         int flags;
 811         int error;
 812         int i;
 813 #if 0
 814         int dumpcnt;
 815 #endif
 816
 817         hmp = MPTOHMP(mp);
 818 #if 0
 819         if ((waitfor & MNT_LAZY) == 0) {
 820                 dumpcnt = 50;
 821                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 822         }
 823 #endif
 824
 825         flags = VMSC_GETVP;
 826         if (waitfor & MNT_LAZY)
 827                 flags |= VMSC_ONEPASS;
 828
 829         hammer2_trans_init(hmp, &info.trans, HAMMER2_TRANS_ISFLUSH);
 830
 831         info.error = 0;
 832         info.waitfor = MNT_NOWAIT;
 833         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 834                       hammer2_sync_scan1,
 835                       hammer2_sync_scan2, &info);
 836         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 837                 info.waitfor = waitfor;
 838                     vmntvnodescan(mp, flags,
 839                                   hammer2_sync_scan1,
 840                                   hammer2_sync_scan2, &info);
 841
 842         }
 843 #if 0
 844         if (waitfor == MNT_WAIT) {
 845                 /* XXX */
 846         } else {
 847                 /* XXX */
 848         }
 849 #endif
 850         /*
 851          * Rollup flush.  The fsyncs above basically just flushed
 852          * data blocks.  The flush below gets all the meta-data.
 853          */
 854         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 855         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 856                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 857                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 858         }
 859         hammer2_chain_unlock(&hmp->vchain);
 860
 861         error = 0;
 862
 863         /*
 864          * We can't safely flush the volume header until we have
 865          * flushed any device buffers which have built up.
 866          *
 867          * XXX this isn't being incremental
 868          */
 869         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 870         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 871         vn_unlock(hmp->devvp);
 872
 873         /*
 874          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 875          * volume header needs synchronization via hmp->volsync.
 876          *
 877          * XXX synchronize the flag & data with only this flush XXX
 878          */
 879         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 880                 struct buf *bp;
 881
 882                 /*
 883                  * Synchronize the disk before flushing the volume
 884                  * header.
 885                  */
 886                 bp = getpbuf(NULL);
 887                 bp->b_bio1.bio_offset = 0;
 888                 bp->b_bufsize = 0;
 889                 bp->b_bcount = 0;
 890                 bp->b_cmd = BUF_CMD_FLUSH;
 891                 bp->b_bio1.bio_done = biodone_sync;
 892                 bp->b_bio1.bio_flags |= BIO_SYNC;
 893                 vn_strategy(hmp->devvp, &bp->b_bio1);
 894                 biowait(&bp->b_bio1, "h2vol");
 895                 relpbuf(bp, NULL);
 896
 897                 /*
 898                  * Then we can safely flush the version of the volume header
 899                  * synchronized by the flush code.
 900                  */
 901                 i = hmp->volhdrno + 1;
 902                 if (i >= HAMMER2_NUM_VOLHDRS)
 903                         i = 0;
 904                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 905                     hmp->volsync.volu_size) {
 906                         i = 0;
 907                 }
 908                 kprintf("sync volhdr %d %jd\n",
 909                         i, (intmax_t)hmp->volsync.volu_size);
 910                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 911                             HAMMER2_PBUFSIZE, 0, 0);
 912                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 913                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 914                 bawrite(bp);
 915                 hmp->volhdrno = i;
 916         }
 917         hammer2_trans_done(&info.trans);
 918         return (error);
 919 }
 920
 921 /*
 922  * Sync passes.
 923  *
 924  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 925  *       won't flush on those flags.  The syncer code above will do a
 926  *       general meta-data flush globally that will catch these flags.
 927  */
 928 static int
 929 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 930 {
 931         hammer2_inode_t *ip;
 932
 933         ip = VTOI(vp);
 934         if (vp->v_type == VNON || ip == NULL ||
 935             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 936              RB_EMPTY(&vp->v_rbdirty_tree))) {
 937                 return(-1);
 938         }
 939         return(0);
 940 }
 941
 942 static int
 943 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 944 {
 945         struct hammer2_sync_info *info = data;
 946         hammer2_inode_t *ip;
 947         hammer2_chain_t *parent;
 948         int error;
 949
 950         ip = VTOI(vp);
 951         if (vp->v_type == VNON || vp->v_type == VBAD ||
 952             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
 953              RB_EMPTY(&vp->v_rbdirty_tree))) {
 954                 return(0);
 955         }
 956
 957         /*
 958          * VOP_FSYNC will start a new transaction so replicate some code
 959          * here to do it inline (see hammer2_vop_fsync()).
 960          */
 961         parent = hammer2_inode_lock_ex(ip);
 962         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
 963         if (ip->vp)
 964                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
 965         hammer2_chain_flush(&info->trans, parent);
 966         hammer2_inode_unlock_ex(ip, parent);
 967         error = 0;
 968 #if 0
 969         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 970 #endif
 971         if (error)
 972                 info->error = error;
 973         return(0);
 974 }
 975
 976 static
 977 int
 978 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 979 {
 980         return (0);
 981 }
 982
 983 static
 984 int
 985 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 986                struct fid *fhp, struct vnode **vpp)
 987 {
 988         return (0);
 989 }
 990
 991 static
 992 int
 993 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 994                  int *exflagsp, struct ucred **credanonp)
 995 {
 996         return (0);
 997 }
 998
 999 /*
1000  * Support code for hammer2_mount().  Read, verify, and install the volume
1001  * header into the HMP
1002  *
1003  * XXX read four volhdrs and use the one with the highest TID whos CRC
1004  *     matches.
1005  *
1006  * XXX check iCRCs.
1007  *
1008  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1009  *     nonexistant locations.
1010  *
1011  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1012  */
1013 static
1014 int
1015 hammer2_install_volume_header(hammer2_mount_t *hmp)
1016 {
1017         hammer2_volume_data_t *vd;
1018         struct buf *bp;
1019         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1020         int error_reported;
1021         int error;
1022         int valid;
1023         int i;
1024
1025         error_reported = 0;
1026         error = 0;
1027         valid = 0;
1028         bp = NULL;
1029
1030         /*
1031          * There are up to 4 copies of the volume header (syncs iterate
1032          * between them so there is no single master).  We don't trust the
1033          * volu_size field so we don't know precisely how large the filesystem
1034          * is, so depend on the OS to return an error if we go beyond the
1035          * block device's EOF.
1036          */
1037         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1038                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1039                               HAMMER2_VOLUME_BYTES, &bp);
1040                 if (error) {
1041                         brelse(bp);
1042                         bp = NULL;
1043                         continue;
1044                 }
1045
1046                 vd = (struct hammer2_volume_data *) bp->b_data;
1047                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1048                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1049                         brelse(bp);
1050                         bp = NULL;
1051                         continue;
1052                 }
1053
1054                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1055                         /* XXX: Reversed-endianness filesystem */
1056                         kprintf("hammer2: reverse-endian filesystem detected");
1057                         brelse(bp);
1058                         bp = NULL;
1059                         continue;
1060                 }
1061
1062                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1063                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1064                                       HAMMER2_VOLUME_ICRC0_SIZE);
1065                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1066                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1067                                        HAMMER2_VOLUME_ICRC1_SIZE);
1068                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1069                         kprintf("hammer2 volume header crc "
1070                                 "mismatch copy #%d %08x/%08x\n",
1071                                 i, crc0, crc);
1072                         error_reported = 1;
1073                         brelse(bp);
1074                         bp = NULL;
1075                         continue;
1076                 }
1077                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1078                         valid = 1;
1079                         hmp->voldata = *vd;
1080                         hmp->volhdrno = i;
1081                 }
1082                 brelse(bp);
1083                 bp = NULL;
1084         }
1085         if (valid) {
1086                 hmp->volsync = hmp->voldata;
1087                 error = 0;
1088                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1089                         kprintf("hammer2: using volume header #%d\n",
1090                                 hmp->volhdrno);
1091                 }
1092         } else {
1093                 error = EINVAL;
1094                 kprintf("hammer2: no valid volume headers found!\n");
1095         }
1096         return (error);
1097 }
1098
1099 /*
1100  * Reconnect using the passed file pointer.  The caller must ref the
1101  * fp for us.
1102  */
1103 void
1104 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1105 {
1106         hammer2_inode_data_t *ipdata;
1107         hammer2_chain_t *parent;
1108         size_t name_len;
1109
1110         /*
1111          * Closes old comm descriptor, kills threads, cleans up
1112          * states, then installs the new descriptor and creates
1113          * new threads.
1114          */
1115         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1116
1117         /*
1118          * Setup LNK_CONN fields for autoinitiated state machine
1119          */
1120         parent = hammer2_inode_lock_ex(pmp->iroot);
1121         ipdata = &parent->data->ipdata;
1122         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1123         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1124         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1125         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1126         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1127
1128         /*
1129          * Filter adjustment.  Clients do not need visibility into other
1130          * clients (otherwise millions of clients would present a serious
1131          * problem).  The fs_label also serves to restrict the namespace.
1132          */
1133         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1134         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1135         switch (ipdata->pfs_type) {
1136         case DMSG_PFSTYPE_CLIENT:
1137                 pmp->iocom.auto_lnk_conn.peer_mask &=
1138                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1139                 break;
1140         default:
1141                 break;
1142         }
1143
1144         name_len = ipdata->name_len;
1145         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1146                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1147         bcopy(ipdata->filename,
1148               pmp->iocom.auto_lnk_conn.fs_label,
1149               name_len);
1150         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1151
1152         /*
1153          * Setup LNK_SPAN fields for autoinitiated state machine
1154          */
1155         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1156         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1157         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1158         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1159         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1160         name_len = ipdata->name_len;
1161         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1162                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1163         bcopy(ipdata->filename,
1164               pmp->iocom.auto_lnk_span.fs_label,
1165               name_len);
1166         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1167         hammer2_inode_unlock_ex(pmp->iroot, parent);
1168
1169         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1170 }
1171
1172 static int
1173 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1174 {
1175         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1176         case DMSG_DBG_SHELL:
1177                 /*
1178                  * (non-transaction)
1179                  * Execute shell command (not supported atm)
1180                  */
1181                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1182                 break;
1183         case DMSG_DBG_SHELL | DMSGF_REPLY:
1184                 /*
1185                  * (non-transaction)
1186                  */
1187                 if (msg->aux_data) {
1188                         msg->aux_data[msg->aux_size - 1] = 0;
1189                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1190                 }
1191                 break;
1192         default:
1193                 /*
1194                  * Unsupported message received.  We only need to
1195                  * reply if it's a transaction in order to close our end.
1196                  * Ignore any one-way messages are any further messages
1197                  * associated with the transaction.
1198                  *
1199                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1200                  *       which might be one-way, replying to those would
1201                  *       cause an infinite ping-pong.
1202                  */
1203                 if (msg->any.head.cmd & DMSGF_CREATE)
1204                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1205                 break;
1206         }
1207         return(0);
1208 }
1209
1210 /*
1211  * This function is called after KDMSG has automatically handled processing
1212  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1213  *
1214  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1215  * advertises all available hammer2 super-root volumes.
1216  */
1217 static void
1218 hammer2_autodmsg(kdmsg_msg_t *msg)
1219 {
1220         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1221         hammer2_mount_t *hmp = pmp->hmp;
1222         int copyid;
1223
1224         /*
1225          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1226          * has already processed the reply, we use this calback as a shim
1227          * to know when we can advertise available super-root volumes.
1228          */
1229         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1230             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1231             msg->state == NULL) {
1232                 return;
1233         }
1234
1235         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1236
1237         if (msg->any.head.cmd & DMSGF_CREATE) {
1238                 kprintf("HAMMER2: VOLDATA DUMP\n");
1239
1240                 /*
1241                  * Dump the configuration stored in the volume header
1242                  */
1243                 hammer2_voldata_lock(hmp);
1244                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1245                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1246                                 continue;
1247                         hammer2_volconf_update(pmp, copyid);
1248                 }
1249                 hammer2_voldata_unlock(hmp, 0);
1250         }
1251         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1252             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1253                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1254         }
1255 }
1256
1257 /*
1258  * Volume configuration updates are passed onto the userland service
1259  * daemon via the open LNK_CONN transaction.
1260  */
1261 void
1262 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1263 {
1264         hammer2_mount_t *hmp = pmp->hmp;
1265         kdmsg_msg_t *msg;
1266
1267         /* XXX interlock against connection state termination */
1268         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1269         if (pmp->iocom.conn_state) {
1270                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1271                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1272                                             DMSG_LNK_VOLCONF, NULL, NULL);
1273                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1274                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1275                 msg->any.lnk_volconf.index = index;
1276                 kdmsg_msg_write(msg);
1277         }
1278 }
1279
1280 void
1281 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1282 {
1283         hammer2_chain_t *scan;
1284
1285         --*countp;
1286         if (*countp == 0) {
1287                 kprintf("%*.*s...\n", tab, tab, "");
1288                 return;
1289         }
1290         if (*countp < 0)
1291                 return;
1292         kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p dt=%s refs=%d",
1293                 tab, tab, "",
1294                 chain->index, chain, chain->bref.type, chain->flags,
1295                 chain->core,
1296                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1297                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1298                 chain->next_parent,
1299                 (chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
1300                 chain->refs);
1301         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1302                 kprintf("\n");
1303         else
1304                 kprintf(" {\n");
1305         RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1306                 hammer2_dump_chain(scan, tab + 4, countp);
1307         }
1308         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1309                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1310                         kprintf("%*.*s}(%s)\n", tab, tab, "",
1311                                 chain->data->ipdata.filename);
1312                 else
1313                         kprintf("%*.*s}\n", tab, tab, "");
1314         }
1315 }