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
 392                 /*
 393                  * vchain setup. vchain.data is special cased to NULL.
 394                  * vchain.refs is initialized and will never drop to 0.
 395                  */
 396                 hmp->vchain.hmp = hmp;
 397                 hmp->vchain.refs = 1;
 398                 hmp->vchain.data = (void *)&hmp->voldata;
 399                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 400                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 401                 hammer2_chain_core_alloc(&hmp->vchain, NULL);
 402                 /* hmp->vchain.u.xxx is left NULL */
 403
 404                 /*
 405                  * Install the volume header
 406                  */
 407                 error = hammer2_install_volume_header(hmp);
 408                 if (error) {
 409                         hammer2_vfs_unmount(mp, MNT_FORCE);
 410                         return error;
 411                 }
 412         }
 413
 414         /*
 415          * required mount structure initializations
 416          */
 417         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 418         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 419
 420         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 421         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 422
 423         /*
 424          * Optional fields
 425          */
 426         mp->mnt_iosize_max = MAXPHYS;
 427
 428         /*
 429          * First locate the super-root inode, which is key 0 relative to the
 430          * volume header's blockset.
 431          *
 432          * Then locate the root inode by scanning the directory keyspace
 433          * represented by the label.
 434          */
 435         if (create_hmp) {
 436                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 437                 schain = hammer2_chain_lookup(&parent,
 438                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 439                 hammer2_chain_lookup_done(parent);
 440                 if (schain == NULL) {
 441                         kprintf("hammer2_mount: invalid super-root\n");
 442                         hammer2_vfs_unmount(mp, MNT_FORCE);
 443                         return EINVAL;
 444                 }
 445                 hammer2_chain_ref(schain);      /* for hmp->schain */
 446                 hmp->schain = schain;           /* left locked for inode_get */
 447                 hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
 448                 hammer2_inode_ref(hmp->sroot);       /* for hmp->sroot */
 449                 hammer2_inode_unlock_ex(hmp->sroot); /* eats schain lock */
 450         } else {
 451                 schain = hmp->schain;
 452         }
 453
 454         /*
 455          * schain only has 1 ref now for its hmp->schain assignment.
 456          * Setup for lookup (which will lock it).
 457          */
 458         parent = hammer2_chain_lookup_init(schain, 0);
 459         lhc = hammer2_dirhash(label, strlen(label));
 460         rchain = hammer2_chain_lookup(&parent,
 461                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 462                                       0);
 463         while (rchain) {
 464                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 465                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 466                         break;
 467                 }
 468                 rchain = hammer2_chain_next(&parent, rchain,
 469                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 470                                             0);
 471         }
 472         hammer2_chain_lookup_done(parent);
 473         if (rchain == NULL) {
 474                 kprintf("hammer2_mount: PFS label not found\n");
 475                 hammer2_vfs_unmount(mp, MNT_FORCE);
 476                 return EINVAL;
 477         }
 478         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 479                 hammer2_chain_unlock(rchain);
 480                 kprintf("hammer2_mount: PFS label already mounted!\n");
 481                 hammer2_vfs_unmount(mp, MNT_FORCE);
 482                 return EBUSY;
 483         }
 484         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 485
 486         /*
 487          * NOTE: *_get() integrates chain's lock into the inode lock.
 488          */
 489         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 490         pmp->rchain = rchain;                   /* left held & unlocked */
 491         pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
 492         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 493         hammer2_inode_unlock_ex(pmp->iroot);    /* iroot & its chain */
 494
 495         kprintf("iroot %p\n", pmp->iroot);
 496
 497         /*
 498          * Ref the cluster management messaging descriptor.  The mount
 499          * program deals with the other end of the communications pipe.
 500          */
 501         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 502         if (fp == NULL) {
 503                 kprintf("hammer2_mount: bad cluster_fd!\n");
 504                 hammer2_vfs_unmount(mp, MNT_FORCE);
 505                 return EBADF;
 506         }
 507         hammer2_cluster_reconnect(pmp, fp);
 508
 509         /*
 510          * Finish setup
 511          */
 512         vfs_getnewfsid(mp);
 513         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 514         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 515         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 516
 517         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 518         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 519         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 520         copyinstr(path, mp->mnt_stat.f_mntonname,
 521                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 522                   &size);
 523
 524         /*
 525          * Initial statfs to prime mnt_stat.
 526          */
 527         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 528
 529         return 0;
 530 }
 531
 532 static
 533 int
 534 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 535                 struct ucred *cred)
 536 {
 537         return (0);
 538 }
 539
 540 static
 541 int
 542 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 543 {
 544         hammer2_pfsmount_t *pmp;
 545         hammer2_mount_t *hmp;
 546         int flags;
 547         int error = 0;
 548         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 549         int dumpcnt;
 550         struct vnode *devvp;
 551
 552         pmp = MPTOPMP(mp);
 553         hmp = pmp->hmp;
 554         flags = 0;
 555
 556         if (mntflags & MNT_FORCE)
 557                 flags |= FORCECLOSE;
 558
 559         hammer2_mount_exlock(hmp);
 560
 561         /*
 562          * If mount initialization proceeded far enough we must flush
 563          * its vnodes.
 564          */
 565         if (pmp->iroot)
 566                 error = vflush(mp, 0, flags);
 567
 568         if (error)
 569                 return error;
 570
 571         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 572         --hmp->pmp_count;
 573         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
 574
 575         /*
 576          * Flush any left over chains.  The voldata lock is only used
 577          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 578          */
 579         hammer2_voldata_lock(hmp);
 580         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 581                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 582                 hammer2_voldata_unlock(hmp, 0);
 583                 hammer2_vfs_sync(mp, MNT_WAIT);
 584         } else {
 585                 hammer2_voldata_unlock(hmp, 0);
 586         }
 587         if (hmp->pmp_count == 0) {
 588                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 589                                          HAMMER2_CHAIN_SUBMODIFIED)) {
 590                         kprintf("hammer2_unmount: chains left over after "
 591                                 "final sync\n");
 592                         if (hammer2_debug & 0x0010)
 593                                 Debugger("entered debugger");
 594                 }
 595         }
 596
 597         /*
 598          * Cleanup the root and super-root chain elements (which should be
 599          * clean).
 600          */
 601         if (pmp->iroot) {
 602                 hammer2_inode_lock_ex(pmp->iroot);
 603                 hammer2_inode_put(pmp->iroot);
 604                 /* lock destroyed by the put */
 605 #if REPORT_REFS_ERRORS
 606                 if (pmp->iroot->refs != 1)
 607                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
 608                                 pmp->iroot, pmp->iroot->refs);
 609 #else
 610                 KKASSERT(pmp->iroot->refs == 1);
 611 #endif
 612                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
 613                 pmp->iroot = NULL;
 614         }
 615         if (pmp->rchain) {
 616                 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
 617 #if REPORT_REFS_ERRORS
 618                 if (pmp->rchain->refs != 1)
 619                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
 620                                 pmp->rchain, pmp->rchain->refs);
 621 #else
 622                 KKASSERT(pmp->rchain->refs == 1);
 623 #endif
 624                 hammer2_chain_drop(pmp->rchain);
 625                 pmp->rchain = NULL;
 626         }
 627         ccms_domain_uninit(&pmp->ccms_dom);
 628
 629         /*
 630          * Kill cluster controller
 631          */
 632         kdmsg_iocom_uninit(&pmp->iocom);
 633
 634         /*
 635          * If no PFS's left drop the master hammer2_mount for the device.
 636          */
 637         if (hmp->pmp_count == 0) {
 638                 if (hmp->sroot) {
 639                         hammer2_inode_drop(hmp->sroot);
 640                         hmp->sroot = NULL;
 641                 }
 642                 if (hmp->schain) {
 643 #if REPORT_REFS_ERRORS
 644                         if (hmp->schain->refs != 1)
 645                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
 646                                         hmp->schain, hmp->schain->refs);
 647 #else
 648                         KKASSERT(hmp->schain->refs == 1);
 649 #endif
 650                         hammer2_chain_drop(hmp->schain);
 651                         hmp->schain = NULL;
 652                 }
 653
 654                 /*
 655                  * Finish up with the device vnode
 656                  */
 657                 if ((devvp = hmp->devvp) != NULL) {
 658                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 659                         hmp->devvp = NULL;
 660                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 661                         vrele(devvp);
 662                         devvp = NULL;
 663                 }
 664         }
 665         hammer2_mount_unlock(hmp);
 666
 667         dumpcnt = 200;
 668         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 669
 670         /*
 671          * Final drop of embedded volume root chain to clean up
 672          * vchain.core (vchain structure is not flagged ALLOCATED
 673          * so it is cleaned out and then left).
 674          */
 675         hammer2_chain_drop(&hmp->vchain);
 676
 677         pmp->mp = NULL;
 678         pmp->hmp = NULL;
 679         mp->mnt_data = NULL;
 680
 681         kmalloc_destroy(&pmp->mmsg);
 682
 683         kfree(pmp, M_HAMMER2);
 684         if (hmp->pmp_count == 0) {
 685                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
 686                 kmalloc_destroy(&hmp->minode);
 687                 kmalloc_destroy(&hmp->mchain);
 688                 kfree(hmp, M_HAMMER2);
 689         }
 690         lockmgr(&hammer2_mntlk, LK_RELEASE);
 691         return (error);
 692 }
 693
 694 static
 695 int
 696 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 697              ino_t ino, struct vnode **vpp)
 698 {
 699         kprintf("hammer2_vget\n");
 700         return (EOPNOTSUPP);
 701 }
 702
 703 static
 704 int
 705 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 706 {
 707         hammer2_pfsmount_t *pmp;
 708         hammer2_mount_t *hmp;
 709         int error;
 710         struct vnode *vp;
 711
 712         pmp = MPTOPMP(mp);
 713         hmp = pmp->hmp;
 714         hammer2_mount_exlock(hmp);
 715         if (pmp->iroot == NULL) {
 716                 *vpp = NULL;
 717                 error = EINVAL;
 718         } else {
 719                 hammer2_inode_lock_sh(pmp->iroot);
 720                 vp = hammer2_igetv(pmp->iroot, &error);
 721                 hammer2_inode_unlock_sh(pmp->iroot);
 722                 *vpp = vp;
 723                 if (vp == NULL)
 724                         kprintf("vnodefail\n");
 725         }
 726         hammer2_mount_unlock(hmp);
 727
 728         return (error);
 729 }
 730
 731 /*
 732  * Filesystem status
 733  *
 734  * XXX incorporate ipdata->inode_quota and data_quota
 735  */
 736 static
 737 int
 738 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 739 {
 740         hammer2_pfsmount_t *pmp;
 741         hammer2_mount_t *hmp;
 742
 743         pmp = MPTOPMP(mp);
 744         hmp = MPTOHMP(mp);
 745
 746         mp->mnt_stat.f_files = pmp->inode_count;
 747         mp->mnt_stat.f_ffree = 0;
 748         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 749         mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
 750                                 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 751         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 752
 753         *sbp = mp->mnt_stat;
 754         return (0);
 755 }
 756
 757 static
 758 int
 759 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 760 {
 761         hammer2_pfsmount_t *pmp;
 762         hammer2_mount_t *hmp;
 763
 764         pmp = MPTOPMP(mp);
 765         hmp = MPTOHMP(mp);
 766
 767         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 768         mp->mnt_vstat.f_files = pmp->inode_count;
 769         mp->mnt_vstat.f_ffree = 0;
 770         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
 771         mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
 772                                  hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
 773         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 774
 775         *sbp = mp->mnt_vstat;
 776         return (0);
 777 }
 778
 779 /*
 780  * Sync the entire filesystem; this is called from the filesystem syncer
 781  * process periodically and whenever a user calls sync(1) on the hammer
 782  * mountpoint.
 783  *
 784  * Currently is actually called from the syncer! \o/
 785  *
 786  * This task will have to snapshot the state of the dirty inode chain.
 787  * From that, it will have to make sure all of the inodes on the dirty
 788  * chain have IO initiated. We make sure that io is initiated for the root
 789  * block.
 790  *
 791  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 792  *
 793  * THINKS: side A vs side B, to have sync not stall all I/O?
 794  */
 795 static
 796 int
 797 hammer2_vfs_sync(struct mount *mp, int waitfor)
 798 {
 799         struct hammer2_sync_info info;
 800         hammer2_mount_t *hmp;
 801         int flags;
 802         int error;
 803         int i;
 804 #if 0
 805         int dumpcnt;
 806 #endif
 807
 808         hmp = MPTOHMP(mp);
 809 #if 0
 810         if ((waitfor & MNT_LAZY) == 0) {
 811                 dumpcnt = 50;
 812                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
 813         }
 814 #endif
 815
 816         flags = VMSC_GETVP;
 817         if (waitfor & MNT_LAZY)
 818                 flags |= VMSC_ONEPASS;
 819
 820         hammer2_trans_init_flush(hmp, &info.trans, 1);
 821         info.error = 0;
 822         info.waitfor = MNT_NOWAIT;
 823         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 824                       hammer2_sync_scan1,
 825                       hammer2_sync_scan2, &info);
 826         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 827                 info.waitfor = waitfor;
 828                     vmntvnodescan(mp, flags,
 829                                   hammer2_sync_scan1,
 830                                   hammer2_sync_scan2, &info);
 831
 832         }
 833 #if 0
 834         if (waitfor == MNT_WAIT) {
 835                 /* XXX */
 836         } else {
 837                 /* XXX */
 838         }
 839 #endif
 840         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 841         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 842                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 843                 hammer2_chain_flush(&info.trans, &hmp->vchain);
 844         }
 845         hammer2_chain_unlock(&hmp->vchain);
 846
 847         error = 0;
 848
 849         /*
 850          * We can't safely flush the volume header until we have
 851          * flushed any device buffers which have built up.
 852          */
 853 #if 0
 854         if ((waitfor & MNT_LAZY) == 0) {
 855                 waitfor = MNT_NOWAIT;
 856                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 857                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 858                 vn_unlock(hmp->devvp);
 859         }
 860 #endif
 861         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 862         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
 863         vn_unlock(hmp->devvp);
 864
 865         /*
 866          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
 867          * volume header needs synchronization via hmp->volsync.
 868          *
 869          * XXX synchronize the flag & data with only this flush XXX
 870          */
 871         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
 872                 struct buf *bp;
 873
 874                 /*
 875                  * Synchronize the disk before flushing the volume
 876                  * header.
 877                  */
 878                 bp = getpbuf(NULL);
 879                 bp->b_bio1.bio_offset = 0;
 880                 bp->b_bufsize = 0;
 881                 bp->b_bcount = 0;
 882                 bp->b_cmd = BUF_CMD_FLUSH;
 883                 bp->b_bio1.bio_done = biodone_sync;
 884                 bp->b_bio1.bio_flags |= BIO_SYNC;
 885                 vn_strategy(hmp->devvp, &bp->b_bio1);
 886                 biowait(&bp->b_bio1, "h2vol");
 887                 relpbuf(bp, NULL);
 888
 889                 /*
 890                  * Then we can safely flush the version of the volume header
 891                  * synchronized by the flush code.
 892                  */
 893                 i = hmp->volhdrno + 1;
 894                 if (i >= HAMMER2_NUM_VOLHDRS)
 895                         i = 0;
 896                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
 897                     hmp->volsync.volu_size) {
 898                         i = 0;
 899                 }
 900                 kprintf("sync volhdr %d %jd\n",
 901                         i, (intmax_t)hmp->volsync.volu_size);
 902                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
 903                             HAMMER2_PBUFSIZE, 0, 0);
 904                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
 905                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
 906                 bawrite(bp);
 907                 hmp->volhdrno = i;
 908         }
 909         hammer2_trans_done_flush(&info.trans, 1);
 910         return (error);
 911 }
 912
 913 /*
 914  * Sync passes.
 915  *
 916  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 917  *       won't flush on those flags.  The syncer code above will do a
 918  *       general meta-data flush globally that will catch these flags.
 919  */
 920 static int
 921 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 922 {
 923         hammer2_inode_t *ip;
 924
 925         ip = VTOI(vp);
 926         if (vp->v_type == VNON || ip == NULL ||
 927             ((ip->flags & (HAMMER2_INODE_MODIFIED |
 928                            HAMMER2_INODE_DIRTYEMBED)) == 0 &&
 929              RB_EMPTY(&vp->v_rbdirty_tree))) {
 930                 return(-1);
 931         }
 932         return(0);
 933 }
 934
 935 static int
 936 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 937 {
 938         struct hammer2_sync_info *info = data;
 939         hammer2_inode_t *ip;
 940         int error;
 941
 942         ip = VTOI(vp);
 943         if (vp->v_type == VNON || vp->v_type == VBAD ||
 944             ((ip->flags & (HAMMER2_INODE_MODIFIED |
 945                            HAMMER2_INODE_DIRTYEMBED)) == 0 &&
 946              RB_EMPTY(&vp->v_rbdirty_tree))) {
 947                 return(0);
 948         }
 949         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 950         if (error)
 951                 info->error = error;
 952         return(0);
 953 }
 954
 955 static
 956 int
 957 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 958 {
 959         return (0);
 960 }
 961
 962 static
 963 int
 964 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 965                struct fid *fhp, struct vnode **vpp)
 966 {
 967         return (0);
 968 }
 969
 970 static
 971 int
 972 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 973                  int *exflagsp, struct ucred **credanonp)
 974 {
 975         return (0);
 976 }
 977
 978 /*
 979  * Support code for hammer2_mount().  Read, verify, and install the volume
 980  * header into the HMP
 981  *
 982  * XXX read four volhdrs and use the one with the highest TID whos CRC
 983  *     matches.
 984  *
 985  * XXX check iCRCs.
 986  *
 987  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
 988  *     nonexistant locations.
 989  *
 990  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
 991  */
 992 static
 993 int
 994 hammer2_install_volume_header(hammer2_mount_t *hmp)
 995 {
 996         hammer2_volume_data_t *vd;
 997         struct buf *bp;
 998         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
 999         int error_reported;
1000         int error;
1001         int valid;
1002         int i;
1003
1004         error_reported = 0;
1005         error = 0;
1006         valid = 0;
1007         bp = NULL;
1008
1009         /*
1010          * There are up to 4 copies of the volume header (syncs iterate
1011          * between them so there is no single master).  We don't trust the
1012          * volu_size field so we don't know precisely how large the filesystem
1013          * is, so depend on the OS to return an error if we go beyond the
1014          * block device's EOF.
1015          */
1016         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1017                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1018                               HAMMER2_VOLUME_BYTES, &bp);
1019                 if (error) {
1020                         brelse(bp);
1021                         bp = NULL;
1022                         continue;
1023                 }
1024
1025                 vd = (struct hammer2_volume_data *) bp->b_data;
1026                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1027                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1028                         brelse(bp);
1029                         bp = NULL;
1030                         continue;
1031                 }
1032
1033                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1034                         /* XXX: Reversed-endianness filesystem */
1035                         kprintf("hammer2: reverse-endian filesystem detected");
1036                         brelse(bp);
1037                         bp = NULL;
1038                         continue;
1039                 }
1040
1041                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1042                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1043                                       HAMMER2_VOLUME_ICRC0_SIZE);
1044                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1045                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1046                                        HAMMER2_VOLUME_ICRC1_SIZE);
1047                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1048                         kprintf("hammer2 volume header crc "
1049                                 "mismatch copy #%d %08x/%08x\n",
1050                                 i, crc0, crc);
1051                         error_reported = 1;
1052                         brelse(bp);
1053                         bp = NULL;
1054                         continue;
1055                 }
1056                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1057                         valid = 1;
1058                         hmp->voldata = *vd;
1059                         hmp->volhdrno = i;
1060                 }
1061                 brelse(bp);
1062                 bp = NULL;
1063         }
1064         if (valid) {
1065                 hmp->volsync = hmp->voldata;
1066                 error = 0;
1067                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1068                         kprintf("hammer2: using volume header #%d\n",
1069                                 hmp->volhdrno);
1070                 }
1071         } else {
1072                 error = EINVAL;
1073                 kprintf("hammer2: no valid volume headers found!\n");
1074         }
1075         return (error);
1076 }
1077
1078 /*
1079  * Reconnect using the passed file pointer.  The caller must ref the
1080  * fp for us.
1081  */
1082 void
1083 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1084 {
1085         hammer2_inode_data_t *ipdata;
1086         size_t name_len;
1087
1088         /*
1089          * Closes old comm descriptor, kills threads, cleans up
1090          * states, then installs the new descriptor and creates
1091          * new threads.
1092          */
1093         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1094
1095         /*
1096          * Setup LNK_CONN fields for autoinitiated state machine
1097          */
1098         hammer2_inode_lock_ex(pmp->iroot);
1099         ipdata = &pmp->iroot->chain->data->ipdata;
1100         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1101         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1102         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1103         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1104         pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1105         hammer2_inode_unlock_ex(pmp->iroot);
1106
1107         /*
1108          * Filter adjustment.  Clients do not need visibility into other
1109          * clients (otherwise millions of clients would present a serious
1110          * problem).  The fs_label also serves to restrict the namespace.
1111          */
1112         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1113         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1114         switch (ipdata->pfs_type) {
1115         case DMSG_PFSTYPE_CLIENT:
1116                 pmp->iocom.auto_lnk_conn.peer_mask &=
1117                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1118                 break;
1119         default:
1120                 break;
1121         }
1122
1123         name_len = ipdata->name_len;
1124         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1125                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1126         bcopy(ipdata->filename,
1127               pmp->iocom.auto_lnk_conn.fs_label,
1128               name_len);
1129         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1130
1131         /*
1132          * Setup LNK_SPAN fields for autoinitiated state machine
1133          */
1134         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1135         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1136         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1137         pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1138         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1139         name_len = ipdata->name_len;
1140         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1141                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1142         bcopy(ipdata->filename,
1143               pmp->iocom.auto_lnk_span.fs_label,
1144               name_len);
1145         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1146
1147         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1148 }
1149
1150 static int
1151 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1152 {
1153         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1154         case DMSG_DBG_SHELL:
1155                 /*
1156                  * (non-transaction)
1157                  * Execute shell command (not supported atm)
1158                  */
1159                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1160                 break;
1161         case DMSG_DBG_SHELL | DMSGF_REPLY:
1162                 /*
1163                  * (non-transaction)
1164                  */
1165                 if (msg->aux_data) {
1166                         msg->aux_data[msg->aux_size - 1] = 0;
1167                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1168                 }
1169                 break;
1170         default:
1171                 /*
1172                  * Unsupported message received.  We only need to
1173                  * reply if it's a transaction in order to close our end.
1174                  * Ignore any one-way messages are any further messages
1175                  * associated with the transaction.
1176                  *
1177                  * NOTE: This case also includes DMSG_LNK_ERROR messages
1178                  *       which might be one-way, replying to those would
1179                  *       cause an infinite ping-pong.
1180                  */
1181                 if (msg->any.head.cmd & DMSGF_CREATE)
1182                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1183                 break;
1184         }
1185         return(0);
1186 }
1187
1188 /*
1189  * This function is called after KDMSG has automatically handled processing
1190  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1191  *
1192  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1193  * advertises all available hammer2 super-root volumes.
1194  */
1195 static void
1196 hammer2_autodmsg(kdmsg_msg_t *msg)
1197 {
1198         hammer2_pfsmount_t *pmp = msg->iocom->handle;
1199         hammer2_mount_t *hmp = pmp->hmp;
1200         int copyid;
1201
1202         /*
1203          * We only care about replies to our LNK_CONN auto-request.  kdmsg
1204          * has already processed the reply, we use this calback as a shim
1205          * to know when we can advertise available super-root volumes.
1206          */
1207         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1208             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1209             msg->state == NULL) {
1210                 return;
1211         }
1212
1213         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1214
1215         if (msg->any.head.cmd & DMSGF_CREATE) {
1216                 kprintf("HAMMER2: VOLDATA DUMP\n");
1217
1218                 /*
1219                  * Dump the configuration stored in the volume header
1220                  */
1221                 hammer2_voldata_lock(hmp);
1222                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1223                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
1224                                 continue;
1225                         hammer2_volconf_update(pmp, copyid);
1226                 }
1227                 hammer2_voldata_unlock(hmp, 0);
1228         }
1229         if ((msg->any.head.cmd & DMSGF_DELETE) &&
1230             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1231                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1232         }
1233 }
1234
1235 /*
1236  * Volume configuration updates are passed onto the userland service
1237  * daemon via the open LNK_CONN transaction.
1238  */
1239 void
1240 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1241 {
1242         hammer2_mount_t *hmp = pmp->hmp;
1243         kdmsg_msg_t *msg;
1244
1245         /* XXX interlock against connection state termination */
1246         kprintf("volconf update %p\n", pmp->iocom.conn_state);
1247         if (pmp->iocom.conn_state) {
1248                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1249                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1250                                             DMSG_LNK_VOLCONF, NULL, NULL);
1251                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1252                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1253                 msg->any.lnk_volconf.index = index;
1254                 kdmsg_msg_write(msg);
1255         }
1256 }
1257
1258 void
1259 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1260 {
1261         hammer2_chain_t *scan;
1262
1263         --*countp;
1264         if (*countp == 0) {
1265                 kprintf("%*.*s...\n", tab, tab, "");
1266                 return;
1267         }
1268         if (*countp < 0)
1269                 return;
1270         kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p refs=%d",
1271                 tab, tab, "",
1272                 chain->index, chain, chain->bref.type, chain->flags,
1273                 chain->core,
1274                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1275                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1276                 chain->duplink, chain->refs);
1277         if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1278                 kprintf("\n");
1279         else
1280                 kprintf(" {\n");
1281         RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1282                 hammer2_dump_chain(scan, tab + 4, countp);
1283         }
1284         if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1285                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1286                         kprintf("%*.*s}(%s)\n", tab, tab, "",
1287                                 chain->data->ipdata.filename);
1288                 else
1289                         kprintf("%*.*s}\n", tab, tab, "");
1290         }
1291 }