sys/vfs/hammer2/hammer2_vfsops.c

   1 /*
   2  * Copyright (c) 2011-2014 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  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61
  62 #include "hammer2.h"
  63 #include "hammer2_lz4.h"
  64
  65 #include "zlib/hammer2_zlib.h"
  66
  67 #define REPORT_REFS_ERRORS 1    /* XXX remove me */
  68
  69 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
  70
  71 struct hammer2_sync_info {
  72         hammer2_trans_t trans;
  73         int error;
  74         int waitfor;
  75 };
  76
  77 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
  78 TAILQ_HEAD(hammer2_pfslist, hammer2_pfsmount);
  79 static struct hammer2_mntlist hammer2_mntlist;
  80 static struct hammer2_pfslist hammer2_pfslist;
  81 static struct lock hammer2_mntlk;
  82
  83 int hammer2_debug;
  84 int hammer2_cluster_enable = 1;
  85 int hammer2_hardlink_enable = 1;
  86 int hammer2_flush_pipe = 100;
  87 int hammer2_synchronous_flush = 1;
  88 int hammer2_dio_count;
  89 long hammer2_limit_dirty_chains;
  90 long hammer2_iod_file_read;
  91 long hammer2_iod_meta_read;
  92 long hammer2_iod_indr_read;
  93 long hammer2_iod_fmap_read;
  94 long hammer2_iod_volu_read;
  95 long hammer2_iod_file_write;
  96 long hammer2_iod_meta_write;
  97 long hammer2_iod_indr_write;
  98 long hammer2_iod_fmap_write;
  99 long hammer2_iod_volu_write;
 100 long hammer2_ioa_file_read;
 101 long hammer2_ioa_meta_read;
 102 long hammer2_ioa_indr_read;
 103 long hammer2_ioa_fmap_read;
 104 long hammer2_ioa_volu_read;
 105 long hammer2_ioa_fmap_write;
 106 long hammer2_ioa_file_write;
 107 long hammer2_ioa_meta_write;
 108 long hammer2_ioa_indr_write;
 109 long hammer2_ioa_volu_write;
 110
 111 MALLOC_DECLARE(C_BUFFER);
 112 MALLOC_DEFINE(C_BUFFER, "compbuffer", "Buffer used for compression.");
 113
 114 MALLOC_DECLARE(D_BUFFER);
 115 MALLOC_DEFINE(D_BUFFER, "decompbuffer", "Buffer used for decompression.");
 116
 117 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
 118
 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
 120            &hammer2_debug, 0, "");
 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
 122            &hammer2_cluster_enable, 0, "");
 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
 124            &hammer2_hardlink_enable, 0, "");
 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
 126            &hammer2_flush_pipe, 0, "");
 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
 128            &hammer2_synchronous_flush, 0, "");
 129 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
 130            &hammer2_limit_dirty_chains, 0, "");
 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
 132            &hammer2_dio_count, 0, "");
 133
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 135            &hammer2_iod_file_read, 0, "");
 136 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 137            &hammer2_iod_meta_read, 0, "");
 138 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 139            &hammer2_iod_indr_read, 0, "");
 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 141            &hammer2_iod_fmap_read, 0, "");
 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 143            &hammer2_iod_volu_read, 0, "");
 144
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 146            &hammer2_iod_file_write, 0, "");
 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 148            &hammer2_iod_meta_write, 0, "");
 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 150            &hammer2_iod_indr_write, 0, "");
 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 152            &hammer2_iod_fmap_write, 0, "");
 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 154            &hammer2_iod_volu_write, 0, "");
 155
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 157            &hammer2_ioa_file_read, 0, "");
 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 159            &hammer2_ioa_meta_read, 0, "");
 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 161            &hammer2_ioa_indr_read, 0, "");
 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 163            &hammer2_ioa_fmap_read, 0, "");
 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 165            &hammer2_ioa_volu_read, 0, "");
 166
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 168            &hammer2_ioa_file_write, 0, "");
 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 170            &hammer2_ioa_meta_write, 0, "");
 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 172            &hammer2_ioa_indr_write, 0, "");
 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 174            &hammer2_ioa_fmap_write, 0, "");
 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 176            &hammer2_ioa_volu_write, 0, "");
 177
 178 static int hammer2_vfs_init(struct vfsconf *conf);
 179 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 180 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 181                                 struct ucred *cred);
 182 static int hammer2_remount(hammer2_mount_t *, struct mount *, char *,
 183                                 struct vnode *, struct ucred *);
 184 static int hammer2_recovery(hammer2_mount_t *hmp);
 185 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 186 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 187 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 188                                 struct ucred *cred);
 189 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 190                                 struct ucred *cred);
 191 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 192                                 ino_t ino, struct vnode **vpp);
 193 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 194                                 struct fid *fhp, struct vnode **vpp);
 195 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 196 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 197                                 int *exflagsp, struct ucred **credanonp);
 198
 199 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 200 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 201
 202 static void hammer2_write_thread(void *arg);
 203
 204 static void hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp);
 205 static void hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp);
 206
 207 /*
 208  * Functions for compression in threads,
 209  * from hammer2_vnops.c
 210  */
 211 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 212                                 hammer2_inode_t *ip,
 213                                 const hammer2_inode_data_t *ripdata,
 214                                 hammer2_cluster_t *cparent,
 215                                 hammer2_key_t lbase, int ioflag, int pblksize,
 216                                 int *errorp);
 217 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 218                                 hammer2_inode_t *ip,
 219                                 const hammer2_inode_data_t *ripdata,
 220                                 hammer2_cluster_t *cparent,
 221                                 hammer2_key_t lbase, int ioflag,
 222                                 int pblksize, int *errorp,
 223                                 int comp_algo, int check_algo);
 224 static void hammer2_zero_check_and_write(struct buf *bp,
 225                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 226                                 const hammer2_inode_data_t *ripdata,
 227                                 hammer2_cluster_t *cparent,
 228                                 hammer2_key_t lbase,
 229                                 int ioflag, int pblksize, int *errorp,
 230                                 int check_algo);
 231 static int test_block_zeros(const char *buf, size_t bytes);
 232 static void zero_write(struct buf *bp, hammer2_trans_t *trans,
 233                                 hammer2_inode_t *ip,
 234                                 const hammer2_inode_data_t *ripdata,
 235                                 hammer2_cluster_t *cparent,
 236                                 hammer2_key_t lbase,
 237                                 int *errorp);
 238 static void hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp,
 239                                 int ioflag, int pblksize, int *errorp,
 240                                 int check_algo);
 241
 242 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 243 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 244 static int hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
 245
 246
 247 /*
 248  * HAMMER2 vfs operations.
 249  */
 250 static struct vfsops hammer2_vfsops = {
 251         .vfs_init       = hammer2_vfs_init,
 252         .vfs_uninit     = hammer2_vfs_uninit,
 253         .vfs_sync       = hammer2_vfs_sync,
 254         .vfs_mount      = hammer2_vfs_mount,
 255         .vfs_unmount    = hammer2_vfs_unmount,
 256         .vfs_root       = hammer2_vfs_root,
 257         .vfs_statfs     = hammer2_vfs_statfs,
 258         .vfs_statvfs    = hammer2_vfs_statvfs,
 259         .vfs_vget       = hammer2_vfs_vget,
 260         .vfs_vptofh     = hammer2_vfs_vptofh,
 261         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 262         .vfs_checkexp   = hammer2_vfs_checkexp
 263 };
 264
 265 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 266
 267 VFS_SET(hammer2_vfsops, hammer2, 0);
 268 MODULE_VERSION(hammer2, 1);
 269
 270 static
 271 int
 272 hammer2_vfs_init(struct vfsconf *conf)
 273 {
 274         static struct objcache_malloc_args margs_read;
 275         static struct objcache_malloc_args margs_write;
 276
 277         int error;
 278
 279         error = 0;
 280
 281         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 282                 error = EINVAL;
 283         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 284                 error = EINVAL;
 285         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 286                 error = EINVAL;
 287
 288         if (error)
 289                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 290
 291         margs_read.objsize = 65536;
 292         margs_read.mtype = D_BUFFER;
 293
 294         margs_write.objsize = 32768;
 295         margs_write.mtype = C_BUFFER;
 296
 297         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 298                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 299                                 objcache_malloc_free, &margs_read);
 300         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 301                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 302                                 objcache_malloc_free, &margs_write);
 303
 304         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 305         TAILQ_INIT(&hammer2_mntlist);
 306         TAILQ_INIT(&hammer2_pfslist);
 307
 308         hammer2_limit_dirty_chains = desiredvnodes / 10;
 309
 310         hammer2_trans_manage_init();
 311
 312         return (error);
 313 }
 314
 315 static
 316 int
 317 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 318 {
 319         objcache_destroy(cache_buffer_read);
 320         objcache_destroy(cache_buffer_write);
 321         return 0;
 322 }
 323
 324 /*
 325  * Core PFS allocator.  Used to allocate the pmp structure for PFS cluster
 326  * mounts and the spmp structure for media (hmp) structures.
 327  */
 328 static hammer2_pfsmount_t *
 329 hammer2_pfsalloc(const hammer2_inode_data_t *ripdata, hammer2_tid_t alloc_tid)
 330 {
 331         hammer2_pfsmount_t *pmp;
 332
 333         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 334         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 335         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 336         lockinit(&pmp->lock, "pfslk", 0, 0);
 337         spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
 338         RB_INIT(&pmp->inum_tree);
 339         TAILQ_INIT(&pmp->unlinkq);
 340         spin_init(&pmp->list_spin, "hm2pfsalloc_list");
 341
 342         pmp->alloc_tid = alloc_tid + 1;   /* our first media transaction id */
 343         pmp->flush_tid = pmp->alloc_tid;
 344         if (ripdata) {
 345                 pmp->inode_tid = ripdata->pfs_inum + 1;
 346                 pmp->pfs_clid = ripdata->pfs_clid;
 347         }
 348         mtx_init(&pmp->wthread_mtx);
 349         bioq_init(&pmp->wthread_bioq);
 350
 351         return pmp;
 352 }
 353
 354 /*
 355  * Mount or remount HAMMER2 fileystem from physical media
 356  *
 357  *      mountroot
 358  *              mp              mount point structure
 359  *              path            NULL
 360  *              data            <unused>
 361  *              cred            <unused>
 362  *
 363  *      mount
 364  *              mp              mount point structure
 365  *              path            path to mount point
 366  *              data            pointer to argument structure in user space
 367  *                      volume  volume path (device@LABEL form)
 368  *                      hflags  user mount flags
 369  *              cred            user credentials
 370  *
 371  * RETURNS:     0       Success
 372  *              !0      error number
 373  */
 374 static
 375 int
 376 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 377                   struct ucred *cred)
 378 {
 379         struct hammer2_mount_info info;
 380         hammer2_pfsmount_t *pmp;
 381         hammer2_pfsmount_t *spmp;
 382         hammer2_mount_t *hmp;
 383         hammer2_key_t key_next;
 384         hammer2_key_t key_dummy;
 385         hammer2_key_t lhc;
 386         struct vnode *devvp;
 387         struct nlookupdata nd;
 388         hammer2_chain_t *parent;
 389         hammer2_chain_t *rchain;
 390         hammer2_cluster_t *cluster;
 391         hammer2_cluster_t *cparent;
 392         const hammer2_inode_data_t *ripdata;
 393         hammer2_blockref_t bref;
 394         struct file *fp;
 395         char devstr[MNAMELEN];
 396         size_t size;
 397         size_t done;
 398         char *dev;
 399         char *label;
 400         int ronly = 1;
 401         int error;
 402         int cache_index;
 403         int ddflag;
 404         int i;
 405
 406         hmp = NULL;
 407         pmp = NULL;
 408         dev = NULL;
 409         label = NULL;
 410         devvp = NULL;
 411         cache_index = -1;
 412
 413         kprintf("hammer2_mount\n");
 414
 415         if (path == NULL) {
 416                 /*
 417                  * Root mount
 418                  */
 419                 bzero(&info, sizeof(info));
 420                 info.cluster_fd = -1;
 421                 return (EOPNOTSUPP);
 422         } else {
 423                 /*
 424                  * Non-root mount or updating a mount
 425                  */
 426                 error = copyin(data, &info, sizeof(info));
 427                 if (error)
 428                         return (error);
 429
 430                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 431                 if (error)
 432                         return (error);
 433
 434                 /* Extract device and label */
 435                 dev = devstr;
 436                 label = strchr(devstr, '@');
 437                 if (label == NULL ||
 438                     ((label + 1) - dev) > done) {
 439                         return (EINVAL);
 440                 }
 441                 *label = '\0';
 442                 label++;
 443                 if (*label == '\0')
 444                         return (EINVAL);
 445
 446                 if (mp->mnt_flag & MNT_UPDATE) {
 447                         /* Update mount */
 448                         /* HAMMER2 implements NFS export via mountctl */
 449                         pmp = MPTOPMP(mp);
 450                         for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
 451                                 hmp = pmp->iroot->cluster.array[i]->hmp;
 452                                 devvp = hmp->devvp;
 453                                 error = hammer2_remount(hmp, mp, path,
 454                                                         devvp, cred);
 455                                 if (error)
 456                                         break;
 457                         }
 458                         /*hammer2_inode_install_hidden(pmp);*/
 459
 460                         return error;
 461                 }
 462         }
 463
 464         /*
 465          * HMP device mount
 466          *
 467          * Lookup name and verify it refers to a block device.
 468          */
 469         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 470         if (error == 0)
 471                 error = nlookup(&nd);
 472         if (error == 0)
 473                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 474         nlookup_done(&nd);
 475
 476         if (error == 0) {
 477                 if (vn_isdisk(devvp, &error))
 478                         error = vfs_mountedon(devvp);
 479         }
 480
 481         /*
 482          * Determine if the device has already been mounted.  After this
 483          * check hmp will be non-NULL if we are doing the second or more
 484          * hammer2 mounts from the same device.
 485          */
 486         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 487         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 488                 if (hmp->devvp == devvp)
 489                         break;
 490         }
 491
 492         /*
 493          * Open the device if this isn't a secondary mount and construct
 494          * the H2 device mount (hmp).
 495          */
 496         if (hmp == NULL) {
 497                 hammer2_chain_t *schain;
 498                 hammer2_xid_t xid;
 499
 500                 if (error == 0 && vcount(devvp) > 0)
 501                         error = EBUSY;
 502
 503                 /*
 504                  * Now open the device
 505                  */
 506                 if (error == 0) {
 507                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 508                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 509                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 510                         if (error == 0) {
 511                                 error = VOP_OPEN(devvp,
 512                                                  ronly ? FREAD : FREAD | FWRITE,
 513                                                  FSCRED, NULL);
 514                         }
 515                         vn_unlock(devvp);
 516                 }
 517                 if (error && devvp) {
 518                         vrele(devvp);
 519                         devvp = NULL;
 520                 }
 521                 if (error) {
 522                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 523                         return error;
 524                 }
 525                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 526                 hmp->ronly = ronly;
 527                 hmp->devvp = devvp;
 528                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 529                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 530                 RB_INIT(&hmp->iotree);
 531                 spin_init(&hmp->io_spin, "hm2mount_io");
 532                 spin_init(&hmp->list_spin, "hm2mount_list");
 533                 TAILQ_INIT(&hmp->flushq);
 534
 535                 lockinit(&hmp->vollk, "h2vol", 0, 0);
 536
 537                 /*
 538                  * vchain setup. vchain.data is embedded.
 539                  * vchain.refs is initialized and will never drop to 0.
 540                  *
 541                  * NOTE! voldata is not yet loaded.
 542                  */
 543                 hmp->vchain.hmp = hmp;
 544                 hmp->vchain.refs = 1;
 545                 hmp->vchain.data = (void *)&hmp->voldata;
 546                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 547                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 548                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 549
 550                 hammer2_chain_core_alloc(NULL, &hmp->vchain);
 551                 /* hmp->vchain.u.xxx is left NULL */
 552
 553                 /*
 554                  * fchain setup.  fchain.data is embedded.
 555                  * fchain.refs is initialized and will never drop to 0.
 556                  *
 557                  * The data is not used but needs to be initialized to
 558                  * pass assertion muster.  We use this chain primarily
 559                  * as a placeholder for the freemap's top-level RBTREE
 560                  * so it does not interfere with the volume's topology
 561                  * RBTREE.
 562                  */
 563                 hmp->fchain.hmp = hmp;
 564                 hmp->fchain.refs = 1;
 565                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 566                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 567                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 568                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 569                 hmp->fchain.bref.methods =
 570                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 571                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 572
 573                 hammer2_chain_core_alloc(NULL, &hmp->fchain);
 574                 /* hmp->fchain.u.xxx is left NULL */
 575
 576                 /*
 577                  * Install the volume header and initialize fields from
 578                  * voldata.
 579                  */
 580                 error = hammer2_install_volume_header(hmp);
 581                 if (error) {
 582                         ++hmp->pmp_count;
 583                         hammer2_vfs_unmount_hmp1(mp, hmp);
 584                         hammer2_vfs_unmount_hmp2(mp, hmp);
 585                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 586                         hammer2_vfs_unmount(mp, MNT_FORCE);
 587                         return error;
 588                 }
 589
 590                 /*
 591                  * Really important to get these right or flush will get
 592                  * confused.
 593                  */
 594                 hmp->spmp = hammer2_pfsalloc(NULL, hmp->voldata.mirror_tid);
 595                 kprintf("alloc spmp %p tid %016jx\n",
 596                         hmp->spmp, hmp->voldata.mirror_tid);
 597                 spmp = hmp->spmp;
 598                 spmp->inode_tid = 1;
 599
 600                 xid = 0;
 601                 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
 602                 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
 603                 hmp->vchain.pmp = spmp;
 604                 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
 605                 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
 606                 hmp->fchain.pmp = spmp;
 607
 608                 /*
 609                  * First locate the super-root inode, which is key 0
 610                  * relative to the volume header's blockset.
 611                  *
 612                  * Then locate the root inode by scanning the directory keyspace
 613                  * represented by the label.
 614                  */
 615                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 616                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 617                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 618                                       &cache_index, 0, &ddflag);
 619                 hammer2_chain_lookup_done(parent);
 620                 if (schain == NULL) {
 621                         kprintf("hammer2_mount: invalid super-root\n");
 622                         ++hmp->pmp_count;
 623                         hammer2_vfs_unmount_hmp1(mp, hmp);
 624                         hammer2_vfs_unmount_hmp2(mp, hmp);
 625                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 626                         hammer2_vfs_unmount(mp, MNT_FORCE);
 627                         return EINVAL;
 628                 }
 629
 630                 /*
 631                  * Sanity-check schain's pmp, finish initializing spmp.
 632                  */
 633                 ripdata = &hammer2_chain_rdata(schain)->ipdata;
 634                 KKASSERT(schain->pmp == spmp);
 635                 spmp->pfs_clid = ripdata->pfs_clid;
 636
 637                 /*
 638                  * NOTE: inode_get sucks up schain's lock.
 639                  */
 640                 cluster = hammer2_cluster_from_chain(schain);
 641                 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster);
 642                 spmp->spmp_hmp = hmp;
 643                 hammer2_inode_ref(spmp->iroot);
 644                 hammer2_inode_unlock_ex(spmp->iroot, cluster);
 645                 schain = NULL;
 646                 /* leave spmp->iroot with one ref */
 647
 648                 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
 649                         error = hammer2_recovery(hmp);
 650                         /* XXX do something with error */
 651                 }
 652                 ++hmp->pmp_count;
 653
 654                 /*
 655                  * XXX RDONLY stuff is totally broken FIXME XXX
 656                  *
 657                  * Automatic LNK_CONN
 658                  * Automatic handling of received LNK_SPAN
 659                  * Automatic handling of received LNK_CIRC
 660                  * No automatic LNK_SPAN generation - we do this ourselves
 661                  * No automatic LNK_CIRC generation - we do this ourselves
 662                  */
 663                 kdmsg_iocom_init(&hmp->iocom, hmp,
 664                                  KDMSG_IOCOMF_AUTOCONN |
 665                                  KDMSG_IOCOMF_AUTORXSPAN,
 666                                  hmp->mchain, hammer2_rcvdmsg);
 667
 668                 /*
 669                  * Ref the cluster management messaging descriptor.  The mount
 670                  * program deals with the other end of the communications pipe.
 671                  */
 672                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 673                 if (fp) {
 674                         hammer2_cluster_reconnect(hmp, fp);
 675                 } else {
 676                         kprintf("hammer2_mount: bad cluster_fd!\n");
 677                 }
 678         } else {
 679                 spmp = hmp->spmp;
 680                 ++hmp->pmp_count;
 681         }
 682
 683         /*
 684          * Lookup mount point under the media-localized super-root.
 685          *
 686          * cluster->pmp will incorrectly point to spmp and must be fixed
 687          * up later on.
 688          */
 689         cparent = hammer2_inode_lock_ex(spmp->iroot);
 690         lhc = hammer2_dirhash(label, strlen(label));
 691         cluster = hammer2_cluster_lookup(cparent, &key_next,
 692                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 693                                       0, &ddflag);
 694         while (cluster) {
 695                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 696                     strcmp(label,
 697                        hammer2_cluster_rdata(cluster)->ipdata.filename) == 0) {
 698                         break;
 699                 }
 700                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 701                                             key_next,
 702                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 703         }
 704         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 705
 706         if (cluster == NULL) {
 707                 kprintf("hammer2_mount: PFS label not found\n");
 708                 hammer2_vfs_unmount_hmp1(mp, hmp);
 709                 hammer2_vfs_unmount_hmp2(mp, hmp);
 710                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 711                 hammer2_vfs_unmount(mp, MNT_FORCE);
 712                 return EINVAL;
 713         }
 714
 715         for (i = 0; i < cluster->nchains; ++i) {
 716                 rchain = cluster->array[i];
 717                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 718                         kprintf("hammer2_mount: PFS label already mounted!\n");
 719                         hammer2_cluster_unlock(cluster);
 720                         hammer2_vfs_unmount_hmp1(mp, hmp);
 721                         hammer2_vfs_unmount_hmp2(mp, hmp);
 722                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 723                         hammer2_vfs_unmount(mp, MNT_FORCE);
 724                         return EBUSY;
 725                 }
 726                 KKASSERT(rchain->pmp == NULL);
 727 #if 0
 728                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 729                         kprintf("hammer2_mount: PFS label is recycling\n");
 730                         hammer2_cluster_unlock(cluster);
 731                         hammer2_vfs_unmount_hmp1(mp, hmp);
 732                         hammer2_vfs_unmount_hmp2(mp, hmp);
 733                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 734                         hammer2_vfs_unmount(mp, MNT_FORCE);
 735                         return EBUSY;
 736                 }
 737 #endif
 738         }
 739
 740         /*
 741          * Check to see if the cluster id is already mounted at the mount
 742          * point.  If it is, add us to the cluster.
 743          */
 744         ripdata = &hammer2_cluster_rdata(cluster)->ipdata;
 745         hammer2_cluster_bref(cluster, &bref);
 746         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 747                 if (pmp->spmp_hmp == NULL &&
 748                     bcmp(&pmp->pfs_clid, &ripdata->pfs_clid,
 749                          sizeof(pmp->pfs_clid)) == 0) {
 750                         break;
 751                 }
 752         }
 753
 754         if (pmp) {
 755                 int i;
 756                 int j;
 757
 758                 hammer2_inode_ref(pmp->iroot);
 759                 ccms_thread_lock(&pmp->iroot->topo_cst, CCMS_STATE_EXCLUSIVE);
 760
 761                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 762                     HAMMER2_MAXCLUSTER) {
 763                         kprintf("hammer2_mount: cluster full!\n");
 764
 765                         ccms_thread_unlock(&pmp->iroot->topo_cst);
 766                         hammer2_inode_drop(pmp->iroot);
 767
 768                         hammer2_cluster_unlock(cluster);
 769                         hammer2_vfs_unmount_hmp1(mp, hmp);
 770                         hammer2_vfs_unmount_hmp2(mp, hmp);
 771                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 772                         hammer2_vfs_unmount(mp, MNT_FORCE);
 773                         return EBUSY;
 774                 }
 775                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 776                 j = pmp->iroot->cluster.nchains;
 777                 for (i = 0; i < cluster->nchains; ++i) {
 778                         rchain = cluster->array[i];
 779                         KKASSERT(rchain->pmp == NULL);
 780                         rchain->pmp = pmp;
 781                         hammer2_chain_ref(cluster->array[i]);
 782                         pmp->iroot->cluster.array[j] = cluster->array[i];
 783                         ++j;
 784                 }
 785                 pmp->iroot->cluster.nchains = j;
 786                 ccms_thread_unlock(&pmp->iroot->topo_cst);
 787                 hammer2_inode_drop(pmp->iroot);
 788                 hammer2_cluster_unlock(cluster);
 789                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 790
 791                 kprintf("ok\n");
 792                 hammer2_inode_install_hidden(pmp);
 793
 794                 return ERANGE;
 795         }
 796
 797         /*
 798          * Block device opened successfully, finish initializing the
 799          * mount structure.
 800          *
 801          * From this point on we have to call hammer2_unmount() on failure.
 802          */
 803         pmp = hammer2_pfsalloc(ripdata, bref.mirror_tid);
 804         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 805         for (i = 0; i < cluster->nchains; ++i) {
 806                 rchain = cluster->array[i];
 807                 KKASSERT(rchain->pmp == NULL);
 808                 rchain->pmp = pmp;
 809                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 810         }
 811         cluster->pmp = pmp;
 812
 813         ccms_domain_init(&pmp->ccms_dom);
 814         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 815         lockmgr(&hammer2_mntlk, LK_RELEASE);
 816
 817         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 818                 hmp, pmp, hmp->pmp_count);
 819
 820         mp->mnt_flag = MNT_LOCAL;
 821         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 822         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 823
 824         /*
 825          * required mount structure initializations
 826          */
 827         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 828         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 829
 830         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 831         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 832
 833         /*
 834          * Optional fields
 835          */
 836         mp->mnt_iosize_max = MAXPHYS;
 837         mp->mnt_data = (qaddr_t)pmp;
 838         pmp->mp = mp;
 839
 840         /*
 841          * After this point hammer2_vfs_unmount() has visibility on hmp
 842          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 843          */
 844         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 845         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 846         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 847
 848         /*
 849          * The logical file buffer bio write thread handles things
 850          * like physical block assignment and compression.
 851          *
 852          * (only applicable to pfs mounts, not applicable to spmp)
 853          */
 854         pmp->wthread_destroy = 0;
 855         lwkt_create(hammer2_write_thread, pmp,
 856                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 857
 858         /*
 859          * With the cluster operational install ihidden.
 860          * (only applicable to pfs mounts, not applicable to spmp)
 861          */
 862         hammer2_inode_install_hidden(pmp);
 863
 864         /*
 865          * Finish setup
 866          */
 867         vfs_getnewfsid(mp);
 868         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 869         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 870         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 871
 872         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 873         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 874         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 875         copyinstr(path, mp->mnt_stat.f_mntonname,
 876                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 877                   &size);
 878
 879         /*
 880          * Initial statfs to prime mnt_stat.
 881          */
 882         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 883
 884         return 0;
 885 }
 886
 887 /*
 888  * Handle bioq for strategy write
 889  */
 890 static
 891 void
 892 hammer2_write_thread(void *arg)
 893 {
 894         hammer2_pfsmount_t *pmp;
 895         struct bio *bio;
 896         struct buf *bp;
 897         hammer2_trans_t trans;
 898         struct vnode *vp;
 899         hammer2_inode_t *ip;
 900         hammer2_cluster_t *cparent;
 901         hammer2_inode_data_t *wipdata;
 902         hammer2_key_t lbase;
 903         int lblksize;
 904         int pblksize;
 905         int error;
 906
 907         pmp = arg;
 908
 909         mtx_lock(&pmp->wthread_mtx);
 910         while (pmp->wthread_destroy == 0) {
 911                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 912                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 913                                  0, "h2bioqw", 0);
 914                 }
 915                 cparent = NULL;
 916
 917                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 918
 919                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 920                         /*
 921                          * dummy bio for synchronization.  The transaction
 922                          * must be reinitialized.
 923                          */
 924                         if (bio->bio_buf == NULL) {
 925                                 bio->bio_flags |= BIO_DONE;
 926                                 wakeup(bio);
 927                                 hammer2_trans_done(&trans);
 928                                 hammer2_trans_init(&trans, pmp,
 929                                                    HAMMER2_TRANS_BUFCACHE);
 930                                 continue;
 931                         }
 932
 933                         /*
 934                          * else normal bio processing
 935                          */
 936                         mtx_unlock(&pmp->wthread_mtx);
 937
 938                         hammer2_lwinprog_drop(pmp);
 939
 940                         error = 0;
 941                         bp = bio->bio_buf;
 942                         vp = bp->b_vp;
 943                         ip = VTOI(vp);
 944
 945                         /*
 946                          * Inode is modified, flush size and mtime changes
 947                          * to ensure that the file size remains consistent
 948                          * with the buffers being flushed.
 949                          *
 950                          * NOTE: The inode_fsync() call only flushes the
 951                          *       inode's meta-data state, it doesn't try
 952                          *       to flush underlying buffers or chains.
 953                          */
 954                         cparent = hammer2_inode_lock_ex(ip);
 955                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 956                                          HAMMER2_INODE_MTIME)) {
 957                                 hammer2_inode_fsync(&trans, ip, cparent);
 958                         }
 959                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 960                                                          cparent, 0);
 961                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 962                                                         &lbase, NULL);
 963                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 964                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 965                                                 cparent,
 966                                                 lbase, IO_ASYNC,
 967                                                 pblksize, &error);
 968                         hammer2_cluster_modsync(cparent);
 969                         hammer2_inode_unlock_ex(ip, cparent);
 970                         if (error) {
 971                                 kprintf("hammer2: error in buffer write\n");
 972                                 bp->b_flags |= B_ERROR;
 973                                 bp->b_error = EIO;
 974                         }
 975                         biodone(bio);
 976                         mtx_lock(&pmp->wthread_mtx);
 977                 }
 978                 hammer2_trans_done(&trans);
 979         }
 980         pmp->wthread_destroy = -1;
 981         wakeup(&pmp->wthread_destroy);
 982
 983         mtx_unlock(&pmp->wthread_mtx);
 984 }
 985
 986 void
 987 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 988 {
 989         struct bio sync_bio;
 990
 991         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 992         mtx_lock(&pmp->wthread_mtx);
 993         if (pmp->wthread_destroy == 0 &&
 994             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 995                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 996                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
 997                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
 998         }
 999         mtx_unlock(&pmp->wthread_mtx);
1000 }
1001
1002 /*
1003  * Return a chain suitable for I/O, creating the chain if necessary
1004  * and assigning its physical block.
1005  */
1006 static
1007 hammer2_cluster_t *
1008 hammer2_assign_physical(hammer2_trans_t *trans,
1009                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1010                         hammer2_key_t lbase, int pblksize, int *errorp)
1011 {
1012         hammer2_cluster_t *cluster;
1013         hammer2_cluster_t *dparent;
1014         hammer2_key_t key_dummy;
1015         int pradix = hammer2_getradix(pblksize);
1016         int ddflag;
1017
1018         /*
1019          * Locate the chain associated with lbase, return a locked chain.
1020          * However, do not instantiate any data reference (which utilizes a
1021          * device buffer) because we will be using direct IO via the
1022          * logical buffer cache buffer.
1023          */
1024         *errorp = 0;
1025         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1026 retry:
1027         dparent = hammer2_cluster_lookup_init(cparent, 0);
1028         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1029                                      lbase, lbase,
1030                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1031
1032         if (cluster == NULL) {
1033                 /*
1034                  * We found a hole, create a new chain entry.
1035                  *
1036                  * NOTE: DATA chains are created without device backing
1037                  *       store (nor do we want any).
1038                  */
1039                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1040                                                lbase, HAMMER2_PBUFRADIX,
1041                                                HAMMER2_BREF_TYPE_DATA,
1042                                                pblksize, 0);
1043                 if (cluster == NULL) {
1044                         hammer2_cluster_lookup_done(dparent);
1045                         panic("hammer2_cluster_create: par=%p error=%d\n",
1046                                 dparent->focus, *errorp);
1047                         goto retry;
1048                 }
1049                 /*ip->delta_dcount += pblksize;*/
1050         } else {
1051                 switch (hammer2_cluster_type(cluster)) {
1052                 case HAMMER2_BREF_TYPE_INODE:
1053                         /*
1054                          * The data is embedded in the inode.  The
1055                          * caller is responsible for marking the inode
1056                          * modified and copying the data to the embedded
1057                          * area.
1058                          */
1059                         break;
1060                 case HAMMER2_BREF_TYPE_DATA:
1061                         if (hammer2_cluster_need_resize(cluster, pblksize)) {
1062                                 hammer2_cluster_resize(trans, ip,
1063                                                      dparent, cluster,
1064                                                      pradix,
1065                                                      HAMMER2_MODIFY_OPTDATA);
1066                         }
1067
1068                         /*
1069                          * DATA buffers must be marked modified whether the
1070                          * data is in a logical buffer or not.  We also have
1071                          * to make this call to fixup the chain data pointers
1072                          * after resizing in case this is an encrypted or
1073                          * compressed buffer.
1074                          */
1075                         hammer2_cluster_modify(trans, cluster,
1076                                                HAMMER2_MODIFY_OPTDATA);
1077                         break;
1078                 default:
1079                         panic("hammer2_assign_physical: bad type");
1080                         /* NOT REACHED */
1081                         break;
1082                 }
1083         }
1084
1085         /*
1086          * Cleanup.  If cluster wound up being the inode itself, i.e.
1087          * the DIRECTDATA case for offset 0, then we need to update cparent.
1088          * The caller expects cparent to not become stale.
1089          */
1090         hammer2_cluster_lookup_done(dparent);
1091         /* dparent = NULL; safety */
1092         if (cluster && ddflag)
1093                 hammer2_cluster_replace_locked(cparent, cluster);
1094         return (cluster);
1095 }
1096
1097 /*
1098  * bio queued from hammer2_vnops.c.
1099  *
1100  * The core write function which determines which path to take
1101  * depending on compression settings.  We also have to locate the
1102  * related clusters so we can calculate and set the check data for
1103  * the blockref.
1104  */
1105 static
1106 void
1107 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1108                         hammer2_inode_t *ip,
1109                         const hammer2_inode_data_t *ripdata,
1110                         hammer2_cluster_t *cparent,
1111                         hammer2_key_t lbase, int ioflag, int pblksize,
1112                         int *errorp)
1113 {
1114         hammer2_cluster_t *cluster;
1115
1116         switch(HAMMER2_DEC_ALGO(ripdata->comp_algo)) {
1117         case HAMMER2_COMP_NONE:
1118                 /*
1119                  * We have to assign physical storage to the buffer
1120                  * we intend to dirty or write now to avoid deadlocks
1121                  * in the strategy code later.
1122                  *
1123                  * This can return NOOFFSET for inode-embedded data.
1124                  * The strategy code will take care of it in that case.
1125                  */
1126                 cluster = hammer2_assign_physical(trans, ip, cparent,
1127                                                 lbase, pblksize,
1128                                                 errorp);
1129                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp,
1130                                  ripdata->check_algo);
1131                 if (cluster)
1132                         hammer2_cluster_unlock(cluster);
1133                 break;
1134         case HAMMER2_COMP_AUTOZERO:
1135                 /*
1136                  * Check for zero-fill only
1137                  */
1138                 hammer2_zero_check_and_write(bp, trans, ip,
1139                                     ripdata, cparent, lbase,
1140                                     ioflag, pblksize, errorp,
1141                                     ripdata->check_algo);
1142                 break;
1143         case HAMMER2_COMP_LZ4:
1144         case HAMMER2_COMP_ZLIB:
1145         default:
1146                 /*
1147                  * Check for zero-fill and attempt compression.
1148                  */
1149                 hammer2_compress_and_write(bp, trans, ip,
1150                                            ripdata, cparent,
1151                                            lbase, ioflag,
1152                                            pblksize, errorp,
1153                                            ripdata->comp_algo,
1154                                            ripdata->check_algo);
1155                 break;
1156         }
1157 }
1158
1159 /*
1160  * Generic function that will perform the compression in compression
1161  * write path. The compression algorithm is determined by the settings
1162  * obtained from inode.
1163  */
1164 static
1165 void
1166 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1167         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1168         hammer2_cluster_t *cparent,
1169         hammer2_key_t lbase, int ioflag, int pblksize,
1170         int *errorp, int comp_algo, int check_algo)
1171 {
1172         hammer2_cluster_t *cluster;
1173         hammer2_chain_t *chain;
1174         int comp_size;
1175         int comp_block_size;
1176         int i;
1177         char *comp_buffer;
1178
1179         if (test_block_zeros(bp->b_data, pblksize)) {
1180                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1181                 return;
1182         }
1183
1184         comp_size = 0;
1185         comp_buffer = NULL;
1186
1187         KKASSERT(pblksize / 2 <= 32768);
1188
1189         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1190                 z_stream strm_compress;
1191                 int comp_level;
1192                 int ret;
1193
1194                 switch(HAMMER2_DEC_ALGO(comp_algo)) {
1195                 case HAMMER2_COMP_LZ4:
1196                         comp_buffer = objcache_get(cache_buffer_write,
1197                                                    M_INTWAIT);
1198                         comp_size = LZ4_compress_limitedOutput(
1199                                         bp->b_data,
1200                                         &comp_buffer[sizeof(int)],
1201                                         pblksize,
1202                                         pblksize / 2 - sizeof(int));
1203                         /*
1204                          * We need to prefix with the size, LZ4
1205                          * doesn't do it for us.  Add the related
1206                          * overhead.
1207                          */
1208                         *(int *)comp_buffer = comp_size;
1209                         if (comp_size)
1210                                 comp_size += sizeof(int);
1211                         break;
1212                 case HAMMER2_COMP_ZLIB:
1213                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1214                         if (comp_level == 0)
1215                                 comp_level = 6; /* default zlib compression */
1216                         else if (comp_level < 6)
1217                                 comp_level = 6;
1218                         else if (comp_level > 9)
1219                                 comp_level = 9;
1220                         ret = deflateInit(&strm_compress, comp_level);
1221                         if (ret != Z_OK) {
1222                                 kprintf("HAMMER2 ZLIB: fatal error "
1223                                         "on deflateInit.\n");
1224                         }
1225
1226                         comp_buffer = objcache_get(cache_buffer_write,
1227                                                    M_INTWAIT);
1228                         strm_compress.next_in = bp->b_data;
1229                         strm_compress.avail_in = pblksize;
1230                         strm_compress.next_out = comp_buffer;
1231                         strm_compress.avail_out = pblksize / 2;
1232                         ret = deflate(&strm_compress, Z_FINISH);
1233                         if (ret == Z_STREAM_END) {
1234                                 comp_size = pblksize / 2 -
1235                                             strm_compress.avail_out;
1236                         } else {
1237                                 comp_size = 0;
1238                         }
1239                         ret = deflateEnd(&strm_compress);
1240                         break;
1241                 default:
1242                         kprintf("Error: Unknown compression method.\n");
1243                         kprintf("Comp_method = %d.\n", comp_algo);
1244                         break;
1245                 }
1246         }
1247
1248         if (comp_size == 0) {
1249                 /*
1250                  * compression failed or turned off
1251                  */
1252                 comp_block_size = pblksize;     /* safety */
1253                 if (++ip->comp_heuristic > 128)
1254                         ip->comp_heuristic = 8;
1255         } else {
1256                 /*
1257                  * compression succeeded
1258                  */
1259                 ip->comp_heuristic = 0;
1260                 if (comp_size <= 1024) {
1261                         comp_block_size = 1024;
1262                 } else if (comp_size <= 2048) {
1263                         comp_block_size = 2048;
1264                 } else if (comp_size <= 4096) {
1265                         comp_block_size = 4096;
1266                 } else if (comp_size <= 8192) {
1267                         comp_block_size = 8192;
1268                 } else if (comp_size <= 16384) {
1269                         comp_block_size = 16384;
1270                 } else if (comp_size <= 32768) {
1271                         comp_block_size = 32768;
1272                 } else {
1273                         panic("hammer2: WRITE PATH: "
1274                               "Weird comp_size value.");
1275                         /* NOT REACHED */
1276                         comp_block_size = pblksize;
1277                 }
1278         }
1279
1280         cluster = hammer2_assign_physical(trans, ip, cparent,
1281                                           lbase, comp_block_size,
1282                                           errorp);
1283         ripdata = NULL;
1284
1285         if (*errorp) {
1286                 kprintf("WRITE PATH: An error occurred while "
1287                         "assigning physical space.\n");
1288                 KKASSERT(cluster == NULL);
1289                 goto done;
1290         }
1291
1292         for (i = 0; i < cluster->nchains; ++i) {
1293                 hammer2_inode_data_t *wipdata;
1294                 hammer2_io_t *dio;
1295                 char *bdata;
1296
1297                 chain = cluster->array[i];      /* XXX */
1298                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1299
1300                 switch(chain->bref.type) {
1301                 case HAMMER2_BREF_TYPE_INODE:
1302                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1303                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1304                         KKASSERT(bp->b_loffset == 0);
1305                         bcopy(bp->b_data, wipdata->u.data,
1306                               HAMMER2_EMBEDDED_BYTES);
1307                         break;
1308                 case HAMMER2_BREF_TYPE_DATA:
1309                         /*
1310                          * Optimize out the read-before-write
1311                          * if possible.
1312                          */
1313                         *errorp = hammer2_io_newnz(chain->hmp,
1314                                                    chain->bref.data_off,
1315                                                    chain->bytes,
1316                                                    &dio);
1317                         if (*errorp) {
1318                                 hammer2_io_brelse(&dio);
1319                                 kprintf("hammer2: WRITE PATH: "
1320                                         "dbp bread error\n");
1321                                 break;
1322                         }
1323                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1324
1325                         /*
1326                          * When loading the block make sure we don't
1327                          * leave garbage after the compressed data.
1328                          */
1329                         if (comp_size) {
1330                                 chain->bref.methods =
1331                                         HAMMER2_ENC_COMP(comp_algo) +
1332                                         HAMMER2_ENC_CHECK(check_algo);
1333                                 bcopy(comp_buffer, bdata, comp_size);
1334                                 if (comp_size != comp_block_size) {
1335                                         bzero(bdata + comp_size,
1336                                               comp_block_size - comp_size);
1337                                 }
1338                         } else {
1339                                 chain->bref.methods =
1340                                         HAMMER2_ENC_COMP(
1341                                                 HAMMER2_COMP_NONE) +
1342                                         HAMMER2_ENC_CHECK(check_algo);
1343                                 bcopy(bp->b_data, bdata, pblksize);
1344                         }
1345
1346                         /*
1347                          * The flush code doesn't calculate check codes for
1348                          * file data (doing so can result in excessive I/O),
1349                          * so we do it here.
1350                          */
1351                         hammer2_chain_setcheck(chain, bdata);
1352
1353                         /*
1354                          * Device buffer is now valid, chain is no longer in
1355                          * the initial state.
1356                          *
1357                          * (No blockref table worries with file data)
1358                          */
1359                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1360
1361                         /* Now write the related bdp. */
1362                         if (ioflag & IO_SYNC) {
1363                                 /*
1364                                  * Synchronous I/O requested.
1365                                  */
1366                                 hammer2_io_bwrite(&dio);
1367                         /*
1368                         } else if ((ioflag & IO_DIRECT) &&
1369                                    loff + n == pblksize) {
1370                                 hammer2_io_bdwrite(&dio);
1371                         */
1372                         } else if (ioflag & IO_ASYNC) {
1373                                 hammer2_io_bawrite(&dio);
1374                         } else {
1375                                 hammer2_io_bdwrite(&dio);
1376                         }
1377                         break;
1378                 default:
1379                         panic("hammer2_write_bp: bad chain type %d\n",
1380                                 chain->bref.type);
1381                         /* NOT REACHED */
1382                         break;
1383                 }
1384         }
1385 done:
1386         if (cluster)
1387                 hammer2_cluster_unlock(cluster);
1388         if (comp_buffer)
1389                 objcache_put(cache_buffer_write, comp_buffer);
1390 }
1391
1392 /*
1393  * Function that performs zero-checking and writing without compression,
1394  * it corresponds to default zero-checking path.
1395  */
1396 static
1397 void
1398 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1399         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1400         hammer2_cluster_t *cparent,
1401         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp,
1402         int check_algo)
1403 {
1404         hammer2_cluster_t *cluster;
1405
1406         if (test_block_zeros(bp->b_data, pblksize)) {
1407                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1408         } else {
1409                 cluster = hammer2_assign_physical(trans, ip, cparent,
1410                                                   lbase, pblksize, errorp);
1411                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp,
1412                                  check_algo);
1413                 if (cluster)
1414                         hammer2_cluster_unlock(cluster);
1415         }
1416 }
1417
1418 /*
1419  * A function to test whether a block of data contains only zeros,
1420  * returns TRUE (non-zero) if the block is all zeros.
1421  */
1422 static
1423 int
1424 test_block_zeros(const char *buf, size_t bytes)
1425 {
1426         size_t i;
1427
1428         for (i = 0; i < bytes; i += sizeof(long)) {
1429                 if (*(const long *)(buf + i) != 0)
1430                         return (0);
1431         }
1432         return (1);
1433 }
1434
1435 /*
1436  * Function to "write" a block that contains only zeros.
1437  */
1438 static
1439 void
1440 zero_write(struct buf *bp, hammer2_trans_t *trans,
1441            hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1442            hammer2_cluster_t *cparent,
1443            hammer2_key_t lbase, int *errorp __unused)
1444 {
1445         hammer2_cluster_t *cluster;
1446         hammer2_media_data_t *data;
1447         hammer2_key_t key_dummy;
1448         int ddflag;
1449
1450         cparent = hammer2_cluster_lookup_init(cparent, 0);
1451         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1452                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1453         if (cluster) {
1454                 data = hammer2_cluster_wdata(cluster);
1455
1456                 if (ddflag) {
1457                         KKASSERT(cluster->focus->flags &
1458                                  HAMMER2_CHAIN_MODIFIED);
1459                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1460                         hammer2_cluster_modsync(cluster);
1461                 } else {
1462                         hammer2_cluster_delete(trans, cparent, cluster,
1463                                                HAMMER2_DELETE_PERMANENT);
1464                 }
1465                 hammer2_cluster_unlock(cluster);
1466         }
1467         hammer2_cluster_lookup_done(cparent);
1468 }
1469
1470 /*
1471  * Function to write the data as it is, without performing any sort of
1472  * compression. This function is used in path without compression and
1473  * default zero-checking path.
1474  */
1475 static
1476 void
1477 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1478                                 int pblksize, int *errorp, int check_algo)
1479 {
1480         hammer2_chain_t *chain;
1481         hammer2_inode_data_t *wipdata;
1482         hammer2_io_t *dio;
1483         char *bdata;
1484         int error;
1485         int i;
1486
1487         error = 0;      /* XXX TODO below */
1488
1489         for (i = 0; i < cluster->nchains; ++i) {
1490                 chain = cluster->array[i];      /* XXX */
1491                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1492
1493                 switch(chain->bref.type) {
1494                 case HAMMER2_BREF_TYPE_INODE:
1495                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1496                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1497                         KKASSERT(bp->b_loffset == 0);
1498                         bcopy(bp->b_data, wipdata->u.data,
1499                               HAMMER2_EMBEDDED_BYTES);
1500                         error = 0;
1501                         break;
1502                 case HAMMER2_BREF_TYPE_DATA:
1503                         error = hammer2_io_newnz(chain->hmp,
1504                                                  chain->bref.data_off,
1505                                                  chain->bytes, &dio);
1506                         if (error) {
1507                                 hammer2_io_bqrelse(&dio);
1508                                 kprintf("hammer2: WRITE PATH: "
1509                                         "dbp bread error\n");
1510                                 break;
1511                         }
1512                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1513
1514                         chain->bref.methods = HAMMER2_ENC_COMP(
1515                                                         HAMMER2_COMP_NONE) +
1516                                               HAMMER2_ENC_CHECK(check_algo);
1517                         bcopy(bp->b_data, bdata, chain->bytes);
1518
1519                         /*
1520                          * The flush code doesn't calculate check codes for
1521                          * file data (doing so can result in excessive I/O),
1522                          * so we do it here.
1523                          */
1524                         hammer2_chain_setcheck(chain, bdata);
1525
1526                         /*
1527                          * Device buffer is now valid, chain is no longer in
1528                          * the initial state.
1529                          *
1530                          * (No blockref table worries with file data)
1531                          */
1532                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1533
1534                         if (ioflag & IO_SYNC) {
1535                                 /*
1536                                  * Synchronous I/O requested.
1537                                  */
1538                                 hammer2_io_bwrite(&dio);
1539                         /*
1540                         } else if ((ioflag & IO_DIRECT) &&
1541                                    loff + n == pblksize) {
1542                                 hammer2_io_bdwrite(&dio);
1543                         */
1544                         } else if (ioflag & IO_ASYNC) {
1545                                 hammer2_io_bawrite(&dio);
1546                         } else {
1547                                 hammer2_io_bdwrite(&dio);
1548                         }
1549                         break;
1550                 default:
1551                         panic("hammer2_write_bp: bad chain type %d\n",
1552                               chain->bref.type);
1553                         /* NOT REACHED */
1554                         error = 0;
1555                         break;
1556                 }
1557                 KKASSERT(error == 0);   /* XXX TODO */
1558         }
1559         *errorp = error;
1560 }
1561
1562 static
1563 int
1564 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1565                 struct vnode *devvp, struct ucred *cred)
1566 {
1567         int error;
1568
1569         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1570                 error = hammer2_recovery(hmp);
1571         } else {
1572                 error = 0;
1573         }
1574         return error;
1575 }
1576
1577 static
1578 int
1579 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1580 {
1581         hammer2_pfsmount_t *pmp;
1582         hammer2_mount_t *hmp;
1583         hammer2_chain_t *rchain;
1584         hammer2_cluster_t *cluster;
1585         int flags;
1586         int error = 0;
1587         int i;
1588
1589         pmp = MPTOPMP(mp);
1590
1591         if (pmp == NULL)
1592                 return(0);
1593
1594         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1595         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1596
1597         /*
1598          * If mount initialization proceeded far enough we must flush
1599          * its vnodes.
1600          */
1601         if (mntflags & MNT_FORCE)
1602                 flags = FORCECLOSE;
1603         else
1604                 flags = 0;
1605         if (pmp->iroot) {
1606                 error = vflush(mp, 0, flags);
1607                 if (error)
1608                         goto failed;
1609         }
1610
1611         ccms_domain_uninit(&pmp->ccms_dom);
1612
1613         if (pmp->wthread_td) {
1614                 mtx_lock(&pmp->wthread_mtx);
1615                 pmp->wthread_destroy = 1;
1616                 wakeup(&pmp->wthread_bioq);
1617                 while (pmp->wthread_destroy != -1) {
1618                         mtxsleep(&pmp->wthread_destroy,
1619                                 &pmp->wthread_mtx, 0,
1620                                 "umount-sleep", 0);
1621                 }
1622                 mtx_unlock(&pmp->wthread_mtx);
1623                 pmp->wthread_td = NULL;
1624         }
1625
1626         /*
1627          * Cleanup our reference on ihidden.
1628          */
1629         if (pmp->ihidden) {
1630                 hammer2_inode_drop(pmp->ihidden);
1631                 pmp->ihidden = NULL;
1632         }
1633
1634         /*
1635          * Cleanup our reference on iroot.  iroot is (should) not be needed
1636          * by the flush code.
1637          */
1638         if (pmp->iroot) {
1639                 cluster = &pmp->iroot->cluster;
1640                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1641                         rchain = pmp->iroot->cluster.array[i];
1642                         if (rchain == NULL)
1643                                 continue;
1644                         hmp = rchain->hmp;
1645                         hammer2_vfs_unmount_hmp1(mp, hmp);
1646
1647                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1648 #if REPORT_REFS_ERRORS
1649                         if (rchain->refs != 1)
1650                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1651                                         rchain, rchain->refs);
1652 #else
1653                         KKASSERT(rchain->refs == 1);
1654 #endif
1655                         hammer2_chain_drop(rchain);
1656                         cluster->array[i] = NULL;
1657                         hammer2_vfs_unmount_hmp2(mp, hmp);
1658                 }
1659                 cluster->focus = NULL;
1660
1661 #if REPORT_REFS_ERRORS
1662                 if (pmp->iroot->refs != 1)
1663                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1664                                 pmp->iroot, pmp->iroot->refs);
1665 #else
1666                 KKASSERT(pmp->iroot->refs == 1);
1667 #endif
1668                 /* ref for pmp->iroot */
1669                 hammer2_inode_drop(pmp->iroot);
1670                 pmp->iroot = NULL;
1671         }
1672
1673         pmp->mp = NULL;
1674         mp->mnt_data = NULL;
1675
1676         kmalloc_destroy(&pmp->mmsg);
1677         kmalloc_destroy(&pmp->minode);
1678
1679         kfree(pmp, M_HAMMER2);
1680         error = 0;
1681
1682 failed:
1683         lockmgr(&hammer2_mntlk, LK_RELEASE);
1684
1685         return (error);
1686 }
1687
1688 static
1689 void
1690 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1691 {
1692         hammer2_mount_exlock(hmp);
1693         --hmp->pmp_count;
1694
1695         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1696
1697         kdmsg_iocom_uninit(&hmp->iocom);        /* XXX chain depend deadlck? */
1698
1699         /*
1700          * Cycle the volume data lock as a safety (probably not needed any
1701          * more).  To ensure everything is out we need to flush at least
1702          * three times.  (1) The running of the unlinkq can dirty the
1703          * filesystem, (2) A normal flush can dirty the freemap, and
1704          * (3) ensure that the freemap is fully synchronized.
1705          *
1706          * The next mount's recovery scan can clean everything up but we want
1707          * to leave the filesystem in a 100% clean state on a normal unmount.
1708          */
1709         hammer2_voldata_lock(hmp);
1710         hammer2_voldata_unlock(hmp);
1711         if (mp->mnt_data) {
1712                 hammer2_vfs_sync(mp, MNT_WAIT);
1713                 hammer2_vfs_sync(mp, MNT_WAIT);
1714                 hammer2_vfs_sync(mp, MNT_WAIT);
1715         }
1716
1717         if (hmp->pmp_count == 0) {
1718                 if ((hmp->vchain.flags | hmp->fchain.flags) &
1719                     HAMMER2_CHAIN_FLUSH_MASK) {
1720                         kprintf("hammer2_unmount: chains left over "
1721                                 "after final sync\n");
1722                         kprintf("    vchain %08x\n", hmp->vchain.flags);
1723                         kprintf("    fchain %08x\n", hmp->fchain.flags);
1724
1725                         if (hammer2_debug & 0x0010)
1726                                 Debugger("entered debugger");
1727                 }
1728         }
1729 }
1730
1731 static
1732 void
1733 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1734 {
1735         hammer2_pfsmount_t *spmp;
1736         struct vnode *devvp;
1737         int dumpcnt;
1738         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1739
1740         /*
1741          * If no PFS's left drop the master hammer2_mount for the
1742          * device.
1743          */
1744         if (hmp->pmp_count == 0) {
1745                 /*
1746                  * Clean up SPMP and the super-root inode
1747                  */
1748                 spmp = hmp->spmp;
1749                 if (spmp) {
1750                         if (spmp->iroot) {
1751                                 hammer2_inode_drop(spmp->iroot);
1752                                 spmp->iroot = NULL;
1753                         }
1754                         hmp->spmp = NULL;
1755                         kmalloc_destroy(&spmp->mmsg);
1756                         kmalloc_destroy(&spmp->minode);
1757                         kfree(spmp, M_HAMMER2);
1758                 }
1759
1760                 /*
1761                  * Finish up with the device vnode
1762                  */
1763                 if ((devvp = hmp->devvp) != NULL) {
1764                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1765                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1766                         hmp->devvp = NULL;
1767                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1768                         vn_unlock(devvp);
1769                         vrele(devvp);
1770                         devvp = NULL;
1771                 }
1772
1773                 /*
1774                  * Clear vchain/fchain flags that might prevent final cleanup
1775                  * of these chains.
1776                  */
1777                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1778                         atomic_clear_int(&hmp->vchain.flags,
1779                                          HAMMER2_CHAIN_MODIFIED);
1780                         hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1781                         hammer2_chain_drop(&hmp->vchain);
1782                 }
1783                 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1784                         atomic_clear_int(&hmp->vchain.flags,
1785                                          HAMMER2_CHAIN_UPDATE);
1786                         hammer2_chain_drop(&hmp->vchain);
1787                 }
1788
1789                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1790                         atomic_clear_int(&hmp->fchain.flags,
1791                                          HAMMER2_CHAIN_MODIFIED);
1792                         hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1793                         hammer2_chain_drop(&hmp->fchain);
1794                 }
1795                 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1796                         atomic_clear_int(&hmp->fchain.flags,
1797                                          HAMMER2_CHAIN_UPDATE);
1798                         hammer2_chain_drop(&hmp->fchain);
1799                 }
1800
1801                 /*
1802                  * Final drop of embedded freemap root chain to
1803                  * clean up fchain.core (fchain structure is not
1804                  * flagged ALLOCATED so it is cleaned out and then
1805                  * left to rot).
1806                  */
1807                 hammer2_chain_drop(&hmp->fchain);
1808
1809                 /*
1810                  * Final drop of embedded volume root chain to clean
1811                  * up vchain.core (vchain structure is not flagged
1812                  * ALLOCATED so it is cleaned out and then left to
1813                  * rot).
1814                  */
1815                 dumpcnt = 50;
1816                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1817                 dumpcnt = 50;
1818                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1819                 hammer2_mount_unlock(hmp);
1820                 hammer2_chain_drop(&hmp->vchain);
1821
1822                 hammer2_io_cleanup(hmp, &hmp->iotree);
1823                 if (hmp->iofree_count) {
1824                         kprintf("io_cleanup: %d I/O's left hanging\n",
1825                                 hmp->iofree_count);
1826                 }
1827
1828                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1829                 kmalloc_destroy(&hmp->mchain);
1830                 kfree(hmp, M_HAMMER2);
1831         } else {
1832                 hammer2_mount_unlock(hmp);
1833         }
1834 }
1835
1836 static
1837 int
1838 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1839              ino_t ino, struct vnode **vpp)
1840 {
1841         kprintf("hammer2_vget\n");
1842         return (EOPNOTSUPP);
1843 }
1844
1845 static
1846 int
1847 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1848 {
1849         hammer2_pfsmount_t *pmp;
1850         hammer2_cluster_t *cparent;
1851         int error;
1852         struct vnode *vp;
1853
1854         pmp = MPTOPMP(mp);
1855         if (pmp->iroot == NULL) {
1856                 *vpp = NULL;
1857                 error = EINVAL;
1858         } else {
1859                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1860                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1861                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1862                 *vpp = vp;
1863                 if (vp == NULL)
1864                         kprintf("vnodefail\n");
1865         }
1866
1867         return (error);
1868 }
1869
1870 /*
1871  * Filesystem status
1872  *
1873  * XXX incorporate ipdata->inode_quota and data_quota
1874  */
1875 static
1876 int
1877 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1878 {
1879         hammer2_pfsmount_t *pmp;
1880         hammer2_mount_t *hmp;
1881
1882         pmp = MPTOPMP(mp);
1883         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1884         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1885
1886         mp->mnt_stat.f_files = pmp->inode_count;
1887         mp->mnt_stat.f_ffree = 0;
1888         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1889         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1890         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1891
1892         *sbp = mp->mnt_stat;
1893         return (0);
1894 }
1895
1896 static
1897 int
1898 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1899 {
1900         hammer2_pfsmount_t *pmp;
1901         hammer2_mount_t *hmp;
1902
1903         pmp = MPTOPMP(mp);
1904         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1905         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1906
1907         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1908         mp->mnt_vstat.f_files = pmp->inode_count;
1909         mp->mnt_vstat.f_ffree = 0;
1910         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1911         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1912         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1913
1914         *sbp = mp->mnt_vstat;
1915         return (0);
1916 }
1917
1918 /*
1919  * Mount-time recovery (RW mounts)
1920  *
1921  * Updates to the free block table are allowed to lag flushes by one
1922  * transaction.  In case of a crash, then on a fresh mount we must do an
1923  * incremental scan of the last committed transaction id and make sure that
1924  * all related blocks have been marked allocated.
1925  *
1926  * The super-root topology and each PFS has its own transaction id domain,
1927  * so we must track PFS boundary transitions.
1928  */
1929 struct hammer2_recovery_elm {
1930         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1931         hammer2_chain_t *chain;
1932         hammer2_tid_t sync_tid;
1933 };
1934
1935 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1936
1937 struct hammer2_recovery_info {
1938         struct hammer2_recovery_list list;
1939         int     depth;
1940 };
1941
1942 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1943                         hammer2_chain_t *parent,
1944                         struct hammer2_recovery_info *info,
1945                         hammer2_tid_t sync_tid);
1946
1947 #define HAMMER2_RECOVERY_MAXDEPTH       10
1948
1949 static
1950 int
1951 hammer2_recovery(hammer2_mount_t *hmp)
1952 {
1953         hammer2_trans_t trans;
1954         struct hammer2_recovery_info info;
1955         struct hammer2_recovery_elm *elm;
1956         hammer2_chain_t *parent;
1957         hammer2_tid_t sync_tid;
1958         int error;
1959         int cumulative_error = 0;
1960
1961         hammer2_trans_init(&trans, hmp->spmp, 0);
1962
1963         sync_tid = 0;
1964         TAILQ_INIT(&info.list);
1965         info.depth = 0;
1966         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1967         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1968                                                  &info, sync_tid);
1969         hammer2_chain_lookup_done(parent);
1970
1971         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1972                 TAILQ_REMOVE(&info.list, elm, entry);
1973                 parent = elm->chain;
1974                 sync_tid = elm->sync_tid;
1975                 kfree(elm, M_HAMMER2);
1976
1977                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1978                                            HAMMER2_RESOLVE_NOREF);
1979                 error = hammer2_recovery_scan(&trans, hmp, parent,
1980                                               &info, sync_tid);
1981                 hammer2_chain_unlock(parent);
1982                 if (error)
1983                         cumulative_error = error;
1984         }
1985         hammer2_trans_done(&trans);
1986
1987         return cumulative_error;
1988 }
1989
1990 static
1991 int
1992 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1993                       hammer2_chain_t *parent,
1994                       struct hammer2_recovery_info *info,
1995                       hammer2_tid_t sync_tid)
1996 {
1997         const hammer2_inode_data_t *ripdata;
1998         hammer2_chain_t *chain;
1999         int cache_index;
2000         int cumulative_error = 0;
2001         int pfs_boundary = 0;
2002         int error;
2003
2004         /*
2005          * Adjust freemap to ensure that the block(s) are marked allocated.
2006          */
2007         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2008                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
2009                                        HAMMER2_FREEMAP_DORECOVER);
2010         }
2011
2012         /*
2013          * Check type for recursive scan
2014          */
2015         switch(parent->bref.type) {
2016         case HAMMER2_BREF_TYPE_VOLUME:
2017                 /* data already instantiated */
2018                 break;
2019         case HAMMER2_BREF_TYPE_INODE:
2020                 /*
2021                  * Must instantiate data for DIRECTDATA test and also
2022                  * for recursion.
2023                  */
2024                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2025                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2026                 if (ripdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2027                         /* not applicable to recovery scan */
2028                         hammer2_chain_unlock(parent);
2029                         return 0;
2030                 }
2031                 if ((ripdata->op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2032                     info->depth != 0) {
2033                         pfs_boundary = 1;
2034                         sync_tid = parent->bref.mirror_tid - 1;
2035                 }
2036                 hammer2_chain_unlock(parent);
2037                 break;
2038         case HAMMER2_BREF_TYPE_INDIRECT:
2039                 /*
2040                  * Must instantiate data for recursion
2041                  */
2042                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2043                 hammer2_chain_unlock(parent);
2044                 break;
2045         case HAMMER2_BREF_TYPE_DATA:
2046         case HAMMER2_BREF_TYPE_FREEMAP:
2047         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2048         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2049                 /* not applicable to recovery scan */
2050                 return 0;
2051                 break;
2052         default:
2053                 return EDOM;
2054         }
2055
2056         /*
2057          * Defer operation if depth limit reached or if we are crossing a
2058          * PFS boundary.
2059          */
2060         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2061                 struct hammer2_recovery_elm *elm;
2062
2063                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2064                 elm->chain = parent;
2065                 elm->sync_tid = sync_tid;
2066                 hammer2_chain_ref(parent);
2067                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2068                 /* unlocked by caller */
2069
2070                 return(0);
2071         }
2072
2073
2074         /*
2075          * Recursive scan of the last flushed transaction only.  We are
2076          * doing this without pmp assignments so don't leave the chains
2077          * hanging around after we are done with them.
2078          */
2079         cache_index = 0;
2080         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2081                                    HAMMER2_LOOKUP_NODATA);
2082         while (chain) {
2083                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2084                 if (chain->bref.mirror_tid >= sync_tid) {
2085                         ++info->depth;
2086                         error = hammer2_recovery_scan(trans, hmp, chain,
2087                                                       info, sync_tid);
2088                         --info->depth;
2089                         if (error)
2090                                 cumulative_error = error;
2091                 }
2092                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2093                                            HAMMER2_LOOKUP_NODATA);
2094         }
2095
2096         return cumulative_error;
2097 }
2098
2099 /*
2100  * Sync the entire filesystem; this is called from the filesystem syncer
2101  * process periodically and whenever a user calls sync(1) on the hammer
2102  * mountpoint.
2103  *
2104  * Currently is actually called from the syncer! \o/
2105  *
2106  * This task will have to snapshot the state of the dirty inode chain.
2107  * From that, it will have to make sure all of the inodes on the dirty
2108  * chain have IO initiated. We make sure that io is initiated for the root
2109  * block.
2110  *
2111  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2112  *
2113  * THINKS: side A vs side B, to have sync not stall all I/O?
2114  */
2115 int
2116 hammer2_vfs_sync(struct mount *mp, int waitfor)
2117 {
2118         struct hammer2_sync_info info;
2119         hammer2_inode_t *iroot;
2120         hammer2_chain_t *chain;
2121         hammer2_chain_t *parent;
2122         hammer2_pfsmount_t *pmp;
2123         hammer2_mount_t *hmp;
2124         int flags;
2125         int error;
2126         int total_error;
2127         int force_fchain;
2128         int i;
2129         int j;
2130
2131         pmp = MPTOPMP(mp);
2132         iroot = pmp->iroot;
2133         KKASSERT(iroot);
2134         KKASSERT(iroot->pmp == pmp);
2135
2136         /*
2137          * We can't acquire locks on existing vnodes while in a transaction
2138          * without risking a deadlock.  This assumes that vfsync() can be
2139          * called without the vnode locked (which it can in DragonFly).
2140          * Otherwise we'd have to implement a multi-pass or flag the lock
2141          * failures and retry.
2142          *
2143          * The reclamation code interlocks with the sync list's token
2144          * (by removing the vnode from the scan list) before unlocking
2145          * the inode, giving us time to ref the inode.
2146          */
2147         /*flags = VMSC_GETVP;*/
2148         flags = 0;
2149         if (waitfor & MNT_LAZY)
2150                 flags |= VMSC_ONEPASS;
2151
2152         /*
2153          * Start our flush transaction.  This does not return until all
2154          * concurrent transactions have completed and will prevent any
2155          * new transactions from running concurrently, except for the
2156          * buffer cache transactions.
2157          *
2158          * For efficiency do an async pass before making sure with a
2159          * synchronous pass on all related buffer cache buffers.  It
2160          * should theoretically not be possible for any new file buffers
2161          * to be instantiated during this sequence.
2162          */
2163         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2164                                              HAMMER2_TRANS_PREFLUSH);
2165         hammer2_run_unlinkq(&info.trans, pmp);
2166
2167         info.error = 0;
2168         info.waitfor = MNT_NOWAIT;
2169         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2170         info.waitfor = MNT_WAIT;
2171         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2172
2173         /*
2174          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2175          * buffer cache flushes which occur during the flush.  Device buffers
2176          * are not affected.
2177          */
2178
2179 #if 0
2180         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2181                 info.waitfor = waitfor;
2182                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2183
2184         }
2185 #endif
2186         hammer2_bioq_sync(info.trans.pmp);
2187         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2188
2189         total_error = 0;
2190
2191         /*
2192          * Flush all storage elements making up the cluster
2193          *
2194          * We must also flush any deleted siblings because the super-root
2195          * flush won't do it for us.  They all must be staged or the
2196          * super-root flush will not be able to update its block table
2197          * properly.
2198          *
2199          * XXX currently done serially instead of concurrently
2200          */
2201         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2202                 chain = iroot->cluster.array[i];
2203                 if (chain) {
2204                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2205                         hammer2_flush(&info.trans, chain);
2206                         hammer2_chain_unlock(chain);
2207                 }
2208         }
2209 #if 0
2210         hammer2_trans_done(&info.trans);
2211 #endif
2212
2213         /*
2214          * Flush all volume roots to synchronize PFS flushes with the
2215          * storage media.  Use a super-root transaction for each one.
2216          *
2217          * The flush code will detect super-root -> pfs-root chain
2218          * transitions using the last pfs-root flush.
2219          */
2220         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2221                 chain = iroot->cluster.array[i];
2222                 if (chain == NULL)
2223                         continue;
2224
2225                 hmp = chain->hmp;
2226
2227                 /*
2228                  * We only have to flush each hmp once
2229                  */
2230                 for (j = i - 1; j >= 0; --j) {
2231                         if (iroot->cluster.array[j] &&
2232                             iroot->cluster.array[j]->hmp == hmp)
2233                                 break;
2234                 }
2235                 if (j >= 0)
2236                         continue;
2237                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2238
2239                 /*
2240                  * Force an update of the XID from the PFS root to the
2241                  * topology root.  We couldn't do this from the PFS
2242                  * transaction because a SPMP transaction is needed.
2243                  * This does not modify blocks, instead what it does is
2244                  * allow the flush code to find the transition point and
2245                  * then update on the way back up.
2246                  */
2247                 parent = chain->parent;
2248                 KKASSERT(chain->pmp != parent->pmp);
2249                 hammer2_chain_setflush(&info.trans, parent);
2250
2251                 /*
2252                  * Media mounts have two 'roots', vchain for the topology
2253                  * and fchain for the free block table.  Flush both.
2254                  *
2255                  * Note that the topology and free block table are handled
2256                  * independently, so the free block table can wind up being
2257                  * ahead of the topology.  We depend on the bulk free scan
2258                  * code to deal with any loose ends.
2259                  */
2260                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2261                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2262                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2263                         /*
2264                          * This will also modify vchain as a side effect,
2265                          * mark vchain as modified now.
2266                          */
2267                         hammer2_voldata_modify(hmp);
2268                         chain = &hmp->fchain;
2269                         hammer2_flush(&info.trans, chain);
2270                         KKASSERT(chain == &hmp->fchain);
2271                 }
2272                 hammer2_chain_unlock(&hmp->fchain);
2273                 hammer2_chain_unlock(&hmp->vchain);
2274
2275                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2276                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2277                         chain = &hmp->vchain;
2278                         hammer2_flush(&info.trans, chain);
2279                         KKASSERT(chain == &hmp->vchain);
2280                         force_fchain = 1;
2281                 } else {
2282                         force_fchain = 0;
2283                 }
2284                 hammer2_chain_unlock(&hmp->vchain);
2285
2286 #if 0
2287                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2288                 if ((hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) ||
2289                     force_fchain) {
2290                         /* this will also modify vchain as a side effect */
2291                         chain = &hmp->fchain;
2292                         hammer2_flush(&info.trans, chain);
2293                         KKASSERT(chain == &hmp->fchain);
2294                 }
2295                 hammer2_chain_unlock(&hmp->fchain);
2296 #endif
2297
2298                 error = 0;
2299
2300                 /*
2301                  * We can't safely flush the volume header until we have
2302                  * flushed any device buffers which have built up.
2303                  *
2304                  * XXX this isn't being incremental
2305                  */
2306                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2307                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2308                 vn_unlock(hmp->devvp);
2309
2310                 /*
2311                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2312                  * volume header needs synchronization via hmp->volsync.
2313                  *
2314                  * XXX synchronize the flag & data with only this flush XXX
2315                  */
2316                 if (error == 0 &&
2317                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2318                         struct buf *bp;
2319
2320                         /*
2321                          * Synchronize the disk before flushing the volume
2322                          * header.
2323                          */
2324                         bp = getpbuf(NULL);
2325                         bp->b_bio1.bio_offset = 0;
2326                         bp->b_bufsize = 0;
2327                         bp->b_bcount = 0;
2328                         bp->b_cmd = BUF_CMD_FLUSH;
2329                         bp->b_bio1.bio_done = biodone_sync;
2330                         bp->b_bio1.bio_flags |= BIO_SYNC;
2331                         vn_strategy(hmp->devvp, &bp->b_bio1);
2332                         biowait(&bp->b_bio1, "h2vol");
2333                         relpbuf(bp, NULL);
2334
2335                         /*
2336                          * Then we can safely flush the version of the
2337                          * volume header synchronized by the flush code.
2338                          */
2339                         i = hmp->volhdrno + 1;
2340                         if (i >= HAMMER2_NUM_VOLHDRS)
2341                                 i = 0;
2342                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2343                             hmp->volsync.volu_size) {
2344                                 i = 0;
2345                         }
2346                         kprintf("sync volhdr %d %jd\n",
2347                                 i, (intmax_t)hmp->volsync.volu_size);
2348                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2349                                     HAMMER2_PBUFSIZE, 0, 0);
2350                         atomic_clear_int(&hmp->vchain.flags,
2351                                          HAMMER2_CHAIN_VOLUMESYNC);
2352                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2353                         bawrite(bp);
2354                         hmp->volhdrno = i;
2355                 }
2356                 if (error)
2357                         total_error = error;
2358
2359 #if 0
2360                 hammer2_trans_done(&info.trans);
2361 #endif
2362         }
2363         hammer2_trans_done(&info.trans);
2364
2365         return (total_error);
2366 }
2367
2368 /*
2369  * Sync passes.
2370  */
2371 static int
2372 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2373 {
2374         struct hammer2_sync_info *info = data;
2375         hammer2_inode_t *ip;
2376         int error;
2377
2378         /*
2379          *
2380          */
2381         ip = VTOI(vp);
2382         if (ip == NULL)
2383                 return(0);
2384         if (vp->v_type == VNON || vp->v_type == VBAD) {
2385                 vclrisdirty(vp);
2386                 return(0);
2387         }
2388         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2389             RB_EMPTY(&vp->v_rbdirty_tree)) {
2390                 vclrisdirty(vp);
2391                 return(0);
2392         }
2393
2394         /*
2395          * VOP_FSYNC will start a new transaction so replicate some code
2396          * here to do it inline (see hammer2_vop_fsync()).
2397          *
2398          * WARNING: The vfsync interacts with the buffer cache and might
2399          *          block, we can't hold the inode lock at that time.
2400          *          However, we MUST ref ip before blocking to ensure that
2401          *          it isn't ripped out from under us (since we do not
2402          *          hold a lock on the vnode).
2403          */
2404         hammer2_inode_ref(ip);
2405         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2406         if (vp)
2407                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2408
2409         hammer2_inode_drop(ip);
2410 #if 1
2411         error = 0;
2412         if (error)
2413                 info->error = error;
2414 #endif
2415         return(0);
2416 }
2417
2418 static
2419 int
2420 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2421 {
2422         return (0);
2423 }
2424
2425 static
2426 int
2427 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2428                struct fid *fhp, struct vnode **vpp)
2429 {
2430         return (0);
2431 }
2432
2433 static
2434 int
2435 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2436                  int *exflagsp, struct ucred **credanonp)
2437 {
2438         return (0);
2439 }
2440
2441 /*
2442  * Support code for hammer2_mount().  Read, verify, and install the volume
2443  * header into the HMP
2444  *
2445  * XXX read four volhdrs and use the one with the highest TID whos CRC
2446  *     matches.
2447  *
2448  * XXX check iCRCs.
2449  *
2450  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2451  *     nonexistant locations.
2452  *
2453  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2454  */
2455 static
2456 int
2457 hammer2_install_volume_header(hammer2_mount_t *hmp)
2458 {
2459         hammer2_volume_data_t *vd;
2460         struct buf *bp;
2461         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2462         int error_reported;
2463         int error;
2464         int valid;
2465         int i;
2466
2467         error_reported = 0;
2468         error = 0;
2469         valid = 0;
2470         bp = NULL;
2471
2472         /*
2473          * There are up to 4 copies of the volume header (syncs iterate
2474          * between them so there is no single master).  We don't trust the
2475          * volu_size field so we don't know precisely how large the filesystem
2476          * is, so depend on the OS to return an error if we go beyond the
2477          * block device's EOF.
2478          */
2479         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2480                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2481                               HAMMER2_VOLUME_BYTES, &bp);
2482                 if (error) {
2483                         brelse(bp);
2484                         bp = NULL;
2485                         continue;
2486                 }
2487
2488                 vd = (struct hammer2_volume_data *) bp->b_data;
2489                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2490                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2491                         brelse(bp);
2492                         bp = NULL;
2493                         continue;
2494                 }
2495
2496                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2497                         /* XXX: Reversed-endianness filesystem */
2498                         kprintf("hammer2: reverse-endian filesystem detected");
2499                         brelse(bp);
2500                         bp = NULL;
2501                         continue;
2502                 }
2503
2504                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2505                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2506                                       HAMMER2_VOLUME_ICRC0_SIZE);
2507                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2508                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2509                                        HAMMER2_VOLUME_ICRC1_SIZE);
2510                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2511                         kprintf("hammer2 volume header crc "
2512                                 "mismatch copy #%d %08x/%08x\n",
2513                                 i, crc0, crc);
2514                         error_reported = 1;
2515                         brelse(bp);
2516                         bp = NULL;
2517                         continue;
2518                 }
2519                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2520                         valid = 1;
2521                         hmp->voldata = *vd;
2522                         hmp->volhdrno = i;
2523                 }
2524                 brelse(bp);
2525                 bp = NULL;
2526         }
2527         if (valid) {
2528                 hmp->volsync = hmp->voldata;
2529                 error = 0;
2530                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2531                         kprintf("hammer2: using volume header #%d\n",
2532                                 hmp->volhdrno);
2533                 }
2534         } else {
2535                 error = EINVAL;
2536                 kprintf("hammer2: no valid volume headers found!\n");
2537         }
2538         return (error);
2539 }
2540
2541 /*
2542  * Reconnect using the passed file pointer.  The caller must ref the
2543  * fp for us.
2544  */
2545 void
2546 hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp)
2547 {
2548         size_t name_len;
2549         const char *name = "disk-volume";
2550
2551         /*
2552          * Closes old comm descriptor, kills threads, cleans up
2553          * states, then installs the new descriptor and creates
2554          * new threads.
2555          */
2556         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
2557
2558         /*
2559          * Setup LNK_CONN fields for autoinitiated state machine.  We
2560          * will use SPANs to advertise multiple PFSs so only pass the
2561          * fsid and HAMMER2_PFSTYPE_SUPROOT for the AUTOCONN.
2562          *
2563          * We are not initiating a LNK_SPAN so we do not have to set-up
2564          * iocom.auto_lnk_span.
2565          */
2566         bzero(&hmp->iocom.auto_lnk_conn.pfs_clid,
2567               sizeof(hmp->iocom.auto_lnk_conn.pfs_clid));
2568         hmp->iocom.auto_lnk_conn.pfs_fsid = hmp->voldata.fsid;
2569         hmp->iocom.auto_lnk_conn.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
2570         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
2571 #if 0
2572         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
2573 #endif
2574         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
2575
2576         /*
2577          * Filter adjustment.  Clients do not need visibility into other
2578          * clients (otherwise millions of clients would present a serious
2579          * problem).  The fs_label also serves to restrict the namespace.
2580          */
2581         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
2582         hmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
2583
2584 #if 0
2585         switch (ipdata->pfs_type) {
2586         case DMSG_PFSTYPE_CLIENT:
2587                 hmp->iocom.auto_lnk_conn.peer_mask &=
2588                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
2589                 break;
2590         default:
2591                 break;
2592         }
2593 #endif
2594
2595         name_len = strlen(name);
2596         if (name_len >= sizeof(hmp->iocom.auto_lnk_conn.fs_label))
2597                 name_len = sizeof(hmp->iocom.auto_lnk_conn.fs_label) - 1;
2598         bcopy(name, hmp->iocom.auto_lnk_conn.fs_label, name_len);
2599         hmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2600
2601         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
2602 }
2603
2604 static int
2605 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2606 {
2607         kprintf("RCVMSG %08x\n", msg->tcmd);
2608
2609         switch(msg->tcmd) {
2610         case DMSG_DBG_SHELL:
2611                 /*
2612                  * (non-transaction)
2613                  * Execute shell command (not supported atm)
2614                  */
2615                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
2616                 break;
2617         case DMSG_DBG_SHELL | DMSGF_REPLY:
2618                 /*
2619                  * (non-transaction)
2620                  */
2621                 if (msg->aux_data) {
2622                         msg->aux_data[msg->aux_size - 1] = 0;
2623                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2624                 }
2625                 break;
2626         default:
2627                 /*
2628                  * Unsupported message received.  We only need to
2629                  * reply if it's a transaction in order to close our end.
2630                  * Ignore any one-way messages or any further messages
2631                  * associated with the transaction.
2632                  *
2633                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2634                  *       which might be one-way, replying to those would
2635                  *       cause an infinite ping-pong.
2636                  */
2637                 if (msg->any.head.cmd & DMSGF_CREATE)
2638                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2639                 break;
2640         }
2641         return(0);
2642 }
2643
2644 /*
2645  * This function is called after KDMSG has automatically handled processing
2646  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2647  *
2648  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2649  * advertises all available hammer2 super-root volumes.
2650  */
2651 static void hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state);
2652
2653 static void
2654 hammer2_autodmsg(kdmsg_msg_t *msg)
2655 {
2656         hammer2_mount_t *hmp = msg->state->iocom->handle;
2657         int copyid;
2658
2659         kprintf("RCAMSG %08x\n", msg->tcmd);
2660
2661         switch(msg->tcmd) {
2662         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
2663         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
2664                 if (msg->any.head.cmd & DMSGF_CREATE) {
2665                         kprintf("HAMMER2: VOLDATA DUMP\n");
2666
2667                         /*
2668                          * Dump the configuration stored in the volume header.
2669                          * This will typically be import/export access rights,
2670                          * master encryption keys (encrypted), etc.
2671                          */
2672                         hammer2_voldata_lock(hmp);
2673                         copyid = 0;
2674                         while (copyid < HAMMER2_COPYID_COUNT) {
2675                                 if (hmp->voldata.copyinfo[copyid].copyid)
2676                                         hammer2_volconf_update(hmp, copyid);
2677                                 ++copyid;
2678                         }
2679                         hammer2_voldata_unlock(hmp);
2680
2681                         kprintf("HAMMER2: INITIATE SPANs\n");
2682                         hammer2_update_spans(hmp, msg->state);
2683                 }
2684                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
2685                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2686                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
2687                 }
2688                 break;
2689         default:
2690                 break;
2691         }
2692 }
2693
2694 /*
2695  * Update LNK_SPAN state
2696  */
2697 static void
2698 hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state)
2699 {
2700         const hammer2_inode_data_t *ripdata;
2701         hammer2_cluster_t *cparent;
2702         hammer2_cluster_t *cluster;
2703         hammer2_pfsmount_t *spmp;
2704         hammer2_key_t key_next;
2705         kdmsg_msg_t *rmsg;
2706         size_t name_len;
2707         int ddflag;
2708
2709         /*
2710          * Lookup mount point under the media-localized super-root.
2711          *
2712          * cluster->pmp will incorrectly point to spmp and must be fixed
2713          * up later on.
2714          */
2715         spmp = hmp->spmp;
2716         cparent = hammer2_inode_lock_ex(spmp->iroot);
2717         cluster = hammer2_cluster_lookup(cparent, &key_next,
2718                                          HAMMER2_KEY_MIN,
2719                                          HAMMER2_KEY_MAX,
2720                                          0, &ddflag);
2721         while (cluster) {
2722                 if (hammer2_cluster_type(cluster) != HAMMER2_BREF_TYPE_INODE)
2723                         continue;
2724                 ripdata = &hammer2_cluster_rdata(cluster)->ipdata;
2725                 kprintf("UPDATE SPANS: %s\n", ripdata->filename);
2726
2727                 rmsg = kdmsg_msg_alloc(state, DMSG_LNK_SPAN | DMSGF_CREATE,
2728                                        hammer2_lnk_span_reply, NULL);
2729                 rmsg->any.lnk_span.pfs_clid = ripdata->pfs_clid;
2730                 rmsg->any.lnk_span.pfs_fsid = ripdata->pfs_fsid;
2731                 rmsg->any.lnk_span.pfs_type = ripdata->pfs_type;
2732                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
2733                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2734                 name_len = ripdata->name_len;
2735                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
2736                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
2737                 bcopy(ripdata->filename, rmsg->any.lnk_span.fs_label, name_len);
2738
2739                 kdmsg_msg_write(rmsg);
2740
2741                 cluster = hammer2_cluster_next(cparent, cluster,
2742                                                &key_next,
2743                                                key_next,
2744                                                HAMMER2_KEY_MAX,
2745                                                0);
2746         }
2747         hammer2_inode_unlock_ex(spmp->iroot, cparent);
2748 }
2749
2750 static
2751 int
2752 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
2753 {
2754         if ((state->txcmd & DMSGF_DELETE) == 0 &&
2755             (msg->any.head.cmd & DMSGF_DELETE)) {
2756                 kdmsg_msg_reply(msg, 0);
2757         }
2758         return 0;
2759 }
2760
2761 /*
2762  * Volume configuration updates are passed onto the userland service
2763  * daemon via the open LNK_CONN transaction.
2764  */
2765 void
2766 hammer2_volconf_update(hammer2_mount_t *hmp, int index)
2767 {
2768         kdmsg_msg_t *msg;
2769
2770         /* XXX interlock against connection state termination */
2771         kprintf("volconf update %p\n", hmp->iocom.conn_state);
2772         if (hmp->iocom.conn_state) {
2773                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2774                 msg = kdmsg_msg_alloc(hmp->iocom.conn_state,
2775                                       DMSG_LNK_HAMMER2_VOLCONF,
2776                                       NULL, NULL);
2777                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
2778                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
2779                 H2_LNK_VOLCONF(msg)->index = index;
2780                 kdmsg_msg_write(msg);
2781         }
2782 }
2783
2784 /*
2785  * This handles hysteresis on regular file flushes.  Because the BIOs are
2786  * routed to a thread it is possible for an excessive number to build up
2787  * and cause long front-end stalls long before the runningbuffspace limit
2788  * is hit, so we implement hammer2_flush_pipe to control the
2789  * hysteresis.
2790  *
2791  * This is a particular problem when compression is used.
2792  */
2793 void
2794 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2795 {
2796         atomic_add_int(&pmp->count_lwinprog, 1);
2797 }
2798
2799 void
2800 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2801 {
2802         int lwinprog;
2803
2804         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2805         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2806             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2807                 atomic_clear_int(&pmp->count_lwinprog,
2808                                  HAMMER2_LWINPROG_WAITING);
2809                 wakeup(&pmp->count_lwinprog);
2810         }
2811 }
2812
2813 void
2814 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2815 {
2816         int lwinprog;
2817
2818         for (;;) {
2819                 lwinprog = pmp->count_lwinprog;
2820                 cpu_ccfence();
2821                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2822                         break;
2823                 tsleep_interlock(&pmp->count_lwinprog, 0);
2824                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2825                 lwinprog = pmp->count_lwinprog;
2826                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2827                         break;
2828                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2829         }
2830 }
2831
2832 /*
2833  * Manage excessive memory resource use for chain and related
2834  * structures.
2835  */
2836 void
2837 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2838 {
2839         uint32_t waiting;
2840         uint32_t count;
2841         uint32_t limit;
2842 #if 0
2843         static int zzticks;
2844 #endif
2845
2846         /*
2847          * Atomic check condition and wait.  Also do an early speedup of
2848          * the syncer to try to avoid hitting the wait.
2849          */
2850         for (;;) {
2851                 waiting = pmp->inmem_dirty_chains;
2852                 cpu_ccfence();
2853                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2854
2855                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2856                 if (limit < hammer2_limit_dirty_chains)
2857                         limit = hammer2_limit_dirty_chains;
2858                 if (limit < 1000)
2859                         limit = 1000;
2860
2861 #if 0
2862                 if ((int)(ticks - zzticks) > hz) {
2863                         zzticks = ticks;
2864                         kprintf("count %ld %ld\n", count, limit);
2865                 }
2866 #endif
2867
2868                 /*
2869                  * Block if there are too many dirty chains present, wait
2870                  * for the flush to clean some out.
2871                  */
2872                 if (count > limit) {
2873                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2874                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2875                                                waiting,
2876                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2877                                 speedup_syncer(pmp->mp);
2878                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2879                                        "chnmem", hz);
2880                         }
2881                         continue;       /* loop on success or fail */
2882                 }
2883
2884                 /*
2885                  * Try to start an early flush before we are forced to block.
2886                  */
2887                 if (count > limit * 7 / 10)
2888                         speedup_syncer(pmp->mp);
2889                 break;
2890         }
2891 }
2892
2893 void
2894 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2895 {
2896         if (pmp) {
2897                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2898         }
2899 }
2900
2901 void
2902 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2903 {
2904         uint32_t waiting;
2905
2906         if (pmp == NULL)
2907                 return;
2908
2909         for (;;) {
2910                 waiting = pmp->inmem_dirty_chains;
2911                 cpu_ccfence();
2912                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2913                                        waiting,
2914                                        (waiting - 1) &
2915                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2916                         break;
2917                 }
2918         }
2919
2920         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2921                 wakeup(&pmp->inmem_dirty_chains);
2922 }
2923
2924 /*
2925  * Debugging
2926  */
2927 void
2928 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2929 {
2930         hammer2_chain_t *scan;
2931         hammer2_chain_t *parent;
2932
2933         --*countp;
2934         if (*countp == 0) {
2935                 kprintf("%*.*s...\n", tab, tab, "");
2936                 return;
2937         }
2938         if (*countp < 0)
2939                 return;
2940         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2941                 tab, tab, "", pfx,
2942                 chain, chain->bref.type,
2943                 chain->bref.key, chain->bref.keybits,
2944                 chain->bref.mirror_tid);
2945
2946         kprintf("%*.*s      [%08x] (%s) refs=%d\n",
2947                 tab, tab, "",
2948                 chain->flags,
2949                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2950                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2951                 chain->refs);
2952
2953         kprintf("%*.*s      core [%08x]",
2954                 tab, tab, "",
2955                 chain->core.flags);
2956
2957         parent = chain->parent;
2958         if (parent)
2959                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2960                         tab, tab, "",
2961                         parent, parent->flags, parent->refs);
2962         if (RB_EMPTY(&chain->core.rbtree)) {
2963                 kprintf("\n");
2964         } else {
2965                 kprintf(" {\n");
2966                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2967                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2968                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2969                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2970                                 chain->data->ipdata.filename);
2971                 else
2972                         kprintf("%*.*s}\n", tab, tab, "");
2973         }
2974 }