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                  * No automatic LNK_SPAN generation - we do this ourselves
 660                  */
 661                 kdmsg_iocom_init(&hmp->iocom, hmp,
 662                                  KDMSG_IOCOMF_AUTOCONN |
 663                                  KDMSG_IOCOMF_AUTORXSPAN,
 664                                  hmp->mchain, hammer2_rcvdmsg);
 665
 666                 /*
 667                  * Ref the cluster management messaging descriptor.  The mount
 668                  * program deals with the other end of the communications pipe.
 669                  */
 670                 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 671                 if (fp) {
 672                         hammer2_cluster_reconnect(hmp, fp);
 673                 } else {
 674                         kprintf("hammer2_mount: bad cluster_fd!\n");
 675                 }
 676         } else {
 677                 spmp = hmp->spmp;
 678                 ++hmp->pmp_count;
 679         }
 680
 681         /*
 682          * Lookup mount point under the media-localized super-root.
 683          *
 684          * cluster->pmp will incorrectly point to spmp and must be fixed
 685          * up later on.
 686          */
 687         cparent = hammer2_inode_lock_ex(spmp->iroot);
 688         lhc = hammer2_dirhash(label, strlen(label));
 689         cluster = hammer2_cluster_lookup(cparent, &key_next,
 690                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 691                                       0, &ddflag);
 692         while (cluster) {
 693                 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE &&
 694                     strcmp(label,
 695                        hammer2_cluster_rdata(cluster)->ipdata.filename) == 0) {
 696                         break;
 697                 }
 698                 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
 699                                             key_next,
 700                                             lhc + HAMMER2_DIRHASH_LOMASK, 0);
 701         }
 702         hammer2_inode_unlock_ex(spmp->iroot, cparent);
 703
 704         if (cluster == NULL) {
 705                 kprintf("hammer2_mount: PFS label not found\n");
 706                 hammer2_vfs_unmount_hmp1(mp, hmp);
 707                 hammer2_vfs_unmount_hmp2(mp, hmp);
 708                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 709                 hammer2_vfs_unmount(mp, MNT_FORCE);
 710                 return EINVAL;
 711         }
 712
 713         for (i = 0; i < cluster->nchains; ++i) {
 714                 rchain = cluster->array[i];
 715                 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 716                         kprintf("hammer2_mount: PFS label already mounted!\n");
 717                         hammer2_cluster_unlock(cluster);
 718                         hammer2_vfs_unmount_hmp1(mp, hmp);
 719                         hammer2_vfs_unmount_hmp2(mp, hmp);
 720                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 721                         hammer2_vfs_unmount(mp, MNT_FORCE);
 722                         return EBUSY;
 723                 }
 724                 KKASSERT(rchain->pmp == NULL);
 725 #if 0
 726                 if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 727                         kprintf("hammer2_mount: PFS label is recycling\n");
 728                         hammer2_cluster_unlock(cluster);
 729                         hammer2_vfs_unmount_hmp1(mp, hmp);
 730                         hammer2_vfs_unmount_hmp2(mp, hmp);
 731                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 732                         hammer2_vfs_unmount(mp, MNT_FORCE);
 733                         return EBUSY;
 734                 }
 735 #endif
 736         }
 737
 738         /*
 739          * Check to see if the cluster id is already mounted at the mount
 740          * point.  If it is, add us to the cluster.
 741          */
 742         ripdata = &hammer2_cluster_rdata(cluster)->ipdata;
 743         hammer2_cluster_bref(cluster, &bref);
 744         TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
 745                 if (pmp->spmp_hmp == NULL &&
 746                     bcmp(&pmp->pfs_clid, &ripdata->pfs_clid,
 747                          sizeof(pmp->pfs_clid)) == 0) {
 748                         break;
 749                 }
 750         }
 751
 752         if (pmp) {
 753                 int i;
 754                 int j;
 755
 756                 hammer2_inode_ref(pmp->iroot);
 757                 ccms_thread_lock(&pmp->iroot->topo_cst, CCMS_STATE_EXCLUSIVE);
 758
 759                 if (pmp->iroot->cluster.nchains + cluster->nchains >
 760                     HAMMER2_MAXCLUSTER) {
 761                         kprintf("hammer2_mount: cluster full!\n");
 762
 763                         ccms_thread_unlock(&pmp->iroot->topo_cst);
 764                         hammer2_inode_drop(pmp->iroot);
 765
 766                         hammer2_cluster_unlock(cluster);
 767                         hammer2_vfs_unmount_hmp1(mp, hmp);
 768                         hammer2_vfs_unmount_hmp2(mp, hmp);
 769                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 770                         hammer2_vfs_unmount(mp, MNT_FORCE);
 771                         return EBUSY;
 772                 }
 773                 kprintf("hammer2_vfs_mount: Adding pfs to existing cluster\n");
 774                 j = pmp->iroot->cluster.nchains;
 775                 for (i = 0; i < cluster->nchains; ++i) {
 776                         rchain = cluster->array[i];
 777                         KKASSERT(rchain->pmp == NULL);
 778                         rchain->pmp = pmp;
 779                         hammer2_chain_ref(cluster->array[i]);
 780                         pmp->iroot->cluster.array[j] = cluster->array[i];
 781                         ++j;
 782                 }
 783                 pmp->iroot->cluster.nchains = j;
 784                 ccms_thread_unlock(&pmp->iroot->topo_cst);
 785                 hammer2_inode_drop(pmp->iroot);
 786                 hammer2_cluster_unlock(cluster);
 787                 lockmgr(&hammer2_mntlk, LK_RELEASE);
 788
 789                 kprintf("ok\n");
 790                 hammer2_inode_install_hidden(pmp);
 791
 792                 return ERANGE;
 793         }
 794
 795         /*
 796          * Block device opened successfully, finish initializing the
 797          * mount structure.
 798          *
 799          * From this point on we have to call hammer2_unmount() on failure.
 800          */
 801         pmp = hammer2_pfsalloc(ripdata, bref.mirror_tid);
 802         kprintf("PMP mirror_tid is %016jx\n", bref.mirror_tid);
 803         for (i = 0; i < cluster->nchains; ++i) {
 804                 rchain = cluster->array[i];
 805                 KKASSERT(rchain->pmp == NULL);
 806                 rchain->pmp = pmp;
 807                 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 808         }
 809         cluster->pmp = pmp;
 810
 811         ccms_domain_init(&pmp->ccms_dom);
 812         TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
 813         lockmgr(&hammer2_mntlk, LK_RELEASE);
 814
 815         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 816                 hmp, pmp, hmp->pmp_count);
 817
 818         mp->mnt_flag = MNT_LOCAL;
 819         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 820         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 821
 822         /*
 823          * required mount structure initializations
 824          */
 825         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 826         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 827
 828         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 829         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 830
 831         /*
 832          * Optional fields
 833          */
 834         mp->mnt_iosize_max = MAXPHYS;
 835         mp->mnt_data = (qaddr_t)pmp;
 836         pmp->mp = mp;
 837
 838         /*
 839          * After this point hammer2_vfs_unmount() has visibility on hmp
 840          * and manual hmp1/hmp2 calls are not needed on fatal errors.
 841          */
 842         pmp->iroot = hammer2_inode_get(pmp, NULL, cluster);
 843         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 844         hammer2_inode_unlock_ex(pmp->iroot, cluster);
 845
 846         /*
 847          * The logical file buffer bio write thread handles things
 848          * like physical block assignment and compression.
 849          *
 850          * (only applicable to pfs mounts, not applicable to spmp)
 851          */
 852         pmp->wthread_destroy = 0;
 853         lwkt_create(hammer2_write_thread, pmp,
 854                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 855
 856         /*
 857          * With the cluster operational install ihidden.
 858          * (only applicable to pfs mounts, not applicable to spmp)
 859          */
 860         hammer2_inode_install_hidden(pmp);
 861
 862         /*
 863          * Finish setup
 864          */
 865         vfs_getnewfsid(mp);
 866         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 867         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 868         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 869
 870         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 871         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 872         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 873         copyinstr(path, mp->mnt_stat.f_mntonname,
 874                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 875                   &size);
 876
 877         /*
 878          * Initial statfs to prime mnt_stat.
 879          */
 880         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 881
 882         return 0;
 883 }
 884
 885 /*
 886  * Handle bioq for strategy write
 887  */
 888 static
 889 void
 890 hammer2_write_thread(void *arg)
 891 {
 892         hammer2_pfsmount_t *pmp;
 893         struct bio *bio;
 894         struct buf *bp;
 895         hammer2_trans_t trans;
 896         struct vnode *vp;
 897         hammer2_inode_t *ip;
 898         hammer2_cluster_t *cparent;
 899         hammer2_inode_data_t *wipdata;
 900         hammer2_key_t lbase;
 901         int lblksize;
 902         int pblksize;
 903         int error;
 904
 905         pmp = arg;
 906
 907         mtx_lock(&pmp->wthread_mtx);
 908         while (pmp->wthread_destroy == 0) {
 909                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 910                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 911                                  0, "h2bioqw", 0);
 912                 }
 913                 cparent = NULL;
 914
 915                 hammer2_trans_init(&trans, pmp, HAMMER2_TRANS_BUFCACHE);
 916
 917                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 918                         /*
 919                          * dummy bio for synchronization.  The transaction
 920                          * must be reinitialized.
 921                          */
 922                         if (bio->bio_buf == NULL) {
 923                                 bio->bio_flags |= BIO_DONE;
 924                                 wakeup(bio);
 925                                 hammer2_trans_done(&trans);
 926                                 hammer2_trans_init(&trans, pmp,
 927                                                    HAMMER2_TRANS_BUFCACHE);
 928                                 continue;
 929                         }
 930
 931                         /*
 932                          * else normal bio processing
 933                          */
 934                         mtx_unlock(&pmp->wthread_mtx);
 935
 936                         hammer2_lwinprog_drop(pmp);
 937
 938                         error = 0;
 939                         bp = bio->bio_buf;
 940                         vp = bp->b_vp;
 941                         ip = VTOI(vp);
 942
 943                         /*
 944                          * Inode is modified, flush size and mtime changes
 945                          * to ensure that the file size remains consistent
 946                          * with the buffers being flushed.
 947                          *
 948                          * NOTE: The inode_fsync() call only flushes the
 949                          *       inode's meta-data state, it doesn't try
 950                          *       to flush underlying buffers or chains.
 951                          */
 952                         cparent = hammer2_inode_lock_ex(ip);
 953                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 954                                          HAMMER2_INODE_MTIME)) {
 955                                 hammer2_inode_fsync(&trans, ip, cparent);
 956                         }
 957                         wipdata = hammer2_cluster_modify_ip(&trans, ip,
 958                                                          cparent, 0);
 959                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 960                                                         &lbase, NULL);
 961                         pblksize = hammer2_calc_physical(ip, wipdata, lbase);
 962                         hammer2_write_file_core(bp, &trans, ip, wipdata,
 963                                                 cparent,
 964                                                 lbase, IO_ASYNC,
 965                                                 pblksize, &error);
 966                         hammer2_cluster_modsync(cparent);
 967                         hammer2_inode_unlock_ex(ip, cparent);
 968                         if (error) {
 969                                 kprintf("hammer2: error in buffer write\n");
 970                                 bp->b_flags |= B_ERROR;
 971                                 bp->b_error = EIO;
 972                         }
 973                         biodone(bio);
 974                         mtx_lock(&pmp->wthread_mtx);
 975                 }
 976                 hammer2_trans_done(&trans);
 977         }
 978         pmp->wthread_destroy = -1;
 979         wakeup(&pmp->wthread_destroy);
 980
 981         mtx_unlock(&pmp->wthread_mtx);
 982 }
 983
 984 void
 985 hammer2_bioq_sync(hammer2_pfsmount_t *pmp)
 986 {
 987         struct bio sync_bio;
 988
 989         bzero(&sync_bio, sizeof(sync_bio));     /* dummy with no bio_buf */
 990         mtx_lock(&pmp->wthread_mtx);
 991         if (pmp->wthread_destroy == 0 &&
 992             TAILQ_FIRST(&pmp->wthread_bioq.queue)) {
 993                 bioq_insert_tail(&pmp->wthread_bioq, &sync_bio);
 994                 while ((sync_bio.bio_flags & BIO_DONE) == 0)
 995                         mtxsleep(&sync_bio, &pmp->wthread_mtx, 0, "h2bioq", 0);
 996         }
 997         mtx_unlock(&pmp->wthread_mtx);
 998 }
 999
1000 /*
1001  * Return a chain suitable for I/O, creating the chain if necessary
1002  * and assigning its physical block.
1003  */
1004 static
1005 hammer2_cluster_t *
1006 hammer2_assign_physical(hammer2_trans_t *trans,
1007                         hammer2_inode_t *ip, hammer2_cluster_t *cparent,
1008                         hammer2_key_t lbase, int pblksize, int *errorp)
1009 {
1010         hammer2_cluster_t *cluster;
1011         hammer2_cluster_t *dparent;
1012         hammer2_key_t key_dummy;
1013         int pradix = hammer2_getradix(pblksize);
1014         int ddflag;
1015
1016         /*
1017          * Locate the chain associated with lbase, return a locked chain.
1018          * However, do not instantiate any data reference (which utilizes a
1019          * device buffer) because we will be using direct IO via the
1020          * logical buffer cache buffer.
1021          */
1022         *errorp = 0;
1023         KKASSERT(pblksize >= HAMMER2_ALLOC_MIN);
1024 retry:
1025         dparent = hammer2_cluster_lookup_init(cparent, 0);
1026         cluster = hammer2_cluster_lookup(dparent, &key_dummy,
1027                                      lbase, lbase,
1028                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1029
1030         if (cluster == NULL) {
1031                 /*
1032                  * We found a hole, create a new chain entry.
1033                  *
1034                  * NOTE: DATA chains are created without device backing
1035                  *       store (nor do we want any).
1036                  */
1037                 *errorp = hammer2_cluster_create(trans, dparent, &cluster,
1038                                                lbase, HAMMER2_PBUFRADIX,
1039                                                HAMMER2_BREF_TYPE_DATA,
1040                                                pblksize, 0);
1041                 if (cluster == NULL) {
1042                         hammer2_cluster_lookup_done(dparent);
1043                         panic("hammer2_cluster_create: par=%p error=%d\n",
1044                                 dparent->focus, *errorp);
1045                         goto retry;
1046                 }
1047                 /*ip->delta_dcount += pblksize;*/
1048         } else {
1049                 switch (hammer2_cluster_type(cluster)) {
1050                 case HAMMER2_BREF_TYPE_INODE:
1051                         /*
1052                          * The data is embedded in the inode.  The
1053                          * caller is responsible for marking the inode
1054                          * modified and copying the data to the embedded
1055                          * area.
1056                          */
1057                         break;
1058                 case HAMMER2_BREF_TYPE_DATA:
1059                         if (hammer2_cluster_need_resize(cluster, pblksize)) {
1060                                 hammer2_cluster_resize(trans, ip,
1061                                                      dparent, cluster,
1062                                                      pradix,
1063                                                      HAMMER2_MODIFY_OPTDATA);
1064                         }
1065
1066                         /*
1067                          * DATA buffers must be marked modified whether the
1068                          * data is in a logical buffer or not.  We also have
1069                          * to make this call to fixup the chain data pointers
1070                          * after resizing in case this is an encrypted or
1071                          * compressed buffer.
1072                          */
1073                         hammer2_cluster_modify(trans, cluster,
1074                                                HAMMER2_MODIFY_OPTDATA);
1075                         break;
1076                 default:
1077                         panic("hammer2_assign_physical: bad type");
1078                         /* NOT REACHED */
1079                         break;
1080                 }
1081         }
1082
1083         /*
1084          * Cleanup.  If cluster wound up being the inode itself, i.e.
1085          * the DIRECTDATA case for offset 0, then we need to update cparent.
1086          * The caller expects cparent to not become stale.
1087          */
1088         hammer2_cluster_lookup_done(dparent);
1089         /* dparent = NULL; safety */
1090         if (cluster && ddflag)
1091                 hammer2_cluster_replace_locked(cparent, cluster);
1092         return (cluster);
1093 }
1094
1095 /*
1096  * bio queued from hammer2_vnops.c.
1097  *
1098  * The core write function which determines which path to take
1099  * depending on compression settings.  We also have to locate the
1100  * related clusters so we can calculate and set the check data for
1101  * the blockref.
1102  */
1103 static
1104 void
1105 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
1106                         hammer2_inode_t *ip,
1107                         const hammer2_inode_data_t *ripdata,
1108                         hammer2_cluster_t *cparent,
1109                         hammer2_key_t lbase, int ioflag, int pblksize,
1110                         int *errorp)
1111 {
1112         hammer2_cluster_t *cluster;
1113
1114         switch(HAMMER2_DEC_ALGO(ripdata->comp_algo)) {
1115         case HAMMER2_COMP_NONE:
1116                 /*
1117                  * We have to assign physical storage to the buffer
1118                  * we intend to dirty or write now to avoid deadlocks
1119                  * in the strategy code later.
1120                  *
1121                  * This can return NOOFFSET for inode-embedded data.
1122                  * The strategy code will take care of it in that case.
1123                  */
1124                 cluster = hammer2_assign_physical(trans, ip, cparent,
1125                                                 lbase, pblksize,
1126                                                 errorp);
1127                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp,
1128                                  ripdata->check_algo);
1129                 if (cluster)
1130                         hammer2_cluster_unlock(cluster);
1131                 break;
1132         case HAMMER2_COMP_AUTOZERO:
1133                 /*
1134                  * Check for zero-fill only
1135                  */
1136                 hammer2_zero_check_and_write(bp, trans, ip,
1137                                     ripdata, cparent, lbase,
1138                                     ioflag, pblksize, errorp,
1139                                     ripdata->check_algo);
1140                 break;
1141         case HAMMER2_COMP_LZ4:
1142         case HAMMER2_COMP_ZLIB:
1143         default:
1144                 /*
1145                  * Check for zero-fill and attempt compression.
1146                  */
1147                 hammer2_compress_and_write(bp, trans, ip,
1148                                            ripdata, cparent,
1149                                            lbase, ioflag,
1150                                            pblksize, errorp,
1151                                            ripdata->comp_algo,
1152                                            ripdata->check_algo);
1153                 break;
1154         }
1155 }
1156
1157 /*
1158  * Generic function that will perform the compression in compression
1159  * write path. The compression algorithm is determined by the settings
1160  * obtained from inode.
1161  */
1162 static
1163 void
1164 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
1165         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1166         hammer2_cluster_t *cparent,
1167         hammer2_key_t lbase, int ioflag, int pblksize,
1168         int *errorp, int comp_algo, int check_algo)
1169 {
1170         hammer2_cluster_t *cluster;
1171         hammer2_chain_t *chain;
1172         int comp_size;
1173         int comp_block_size;
1174         int i;
1175         char *comp_buffer;
1176
1177         if (test_block_zeros(bp->b_data, pblksize)) {
1178                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1179                 return;
1180         }
1181
1182         comp_size = 0;
1183         comp_buffer = NULL;
1184
1185         KKASSERT(pblksize / 2 <= 32768);
1186
1187         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
1188                 z_stream strm_compress;
1189                 int comp_level;
1190                 int ret;
1191
1192                 switch(HAMMER2_DEC_ALGO(comp_algo)) {
1193                 case HAMMER2_COMP_LZ4:
1194                         comp_buffer = objcache_get(cache_buffer_write,
1195                                                    M_INTWAIT);
1196                         comp_size = LZ4_compress_limitedOutput(
1197                                         bp->b_data,
1198                                         &comp_buffer[sizeof(int)],
1199                                         pblksize,
1200                                         pblksize / 2 - sizeof(int));
1201                         /*
1202                          * We need to prefix with the size, LZ4
1203                          * doesn't do it for us.  Add the related
1204                          * overhead.
1205                          */
1206                         *(int *)comp_buffer = comp_size;
1207                         if (comp_size)
1208                                 comp_size += sizeof(int);
1209                         break;
1210                 case HAMMER2_COMP_ZLIB:
1211                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1212                         if (comp_level == 0)
1213                                 comp_level = 6; /* default zlib compression */
1214                         else if (comp_level < 6)
1215                                 comp_level = 6;
1216                         else if (comp_level > 9)
1217                                 comp_level = 9;
1218                         ret = deflateInit(&strm_compress, comp_level);
1219                         if (ret != Z_OK) {
1220                                 kprintf("HAMMER2 ZLIB: fatal error "
1221                                         "on deflateInit.\n");
1222                         }
1223
1224                         comp_buffer = objcache_get(cache_buffer_write,
1225                                                    M_INTWAIT);
1226                         strm_compress.next_in = bp->b_data;
1227                         strm_compress.avail_in = pblksize;
1228                         strm_compress.next_out = comp_buffer;
1229                         strm_compress.avail_out = pblksize / 2;
1230                         ret = deflate(&strm_compress, Z_FINISH);
1231                         if (ret == Z_STREAM_END) {
1232                                 comp_size = pblksize / 2 -
1233                                             strm_compress.avail_out;
1234                         } else {
1235                                 comp_size = 0;
1236                         }
1237                         ret = deflateEnd(&strm_compress);
1238                         break;
1239                 default:
1240                         kprintf("Error: Unknown compression method.\n");
1241                         kprintf("Comp_method = %d.\n", comp_algo);
1242                         break;
1243                 }
1244         }
1245
1246         if (comp_size == 0) {
1247                 /*
1248                  * compression failed or turned off
1249                  */
1250                 comp_block_size = pblksize;     /* safety */
1251                 if (++ip->comp_heuristic > 128)
1252                         ip->comp_heuristic = 8;
1253         } else {
1254                 /*
1255                  * compression succeeded
1256                  */
1257                 ip->comp_heuristic = 0;
1258                 if (comp_size <= 1024) {
1259                         comp_block_size = 1024;
1260                 } else if (comp_size <= 2048) {
1261                         comp_block_size = 2048;
1262                 } else if (comp_size <= 4096) {
1263                         comp_block_size = 4096;
1264                 } else if (comp_size <= 8192) {
1265                         comp_block_size = 8192;
1266                 } else if (comp_size <= 16384) {
1267                         comp_block_size = 16384;
1268                 } else if (comp_size <= 32768) {
1269                         comp_block_size = 32768;
1270                 } else {
1271                         panic("hammer2: WRITE PATH: "
1272                               "Weird comp_size value.");
1273                         /* NOT REACHED */
1274                         comp_block_size = pblksize;
1275                 }
1276         }
1277
1278         cluster = hammer2_assign_physical(trans, ip, cparent,
1279                                           lbase, comp_block_size,
1280                                           errorp);
1281         ripdata = NULL;
1282
1283         if (*errorp) {
1284                 kprintf("WRITE PATH: An error occurred while "
1285                         "assigning physical space.\n");
1286                 KKASSERT(cluster == NULL);
1287                 goto done;
1288         }
1289
1290         for (i = 0; i < cluster->nchains; ++i) {
1291                 hammer2_inode_data_t *wipdata;
1292                 hammer2_io_t *dio;
1293                 char *bdata;
1294
1295                 chain = cluster->array[i];      /* XXX */
1296                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1297
1298                 switch(chain->bref.type) {
1299                 case HAMMER2_BREF_TYPE_INODE:
1300                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1301                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1302                         KKASSERT(bp->b_loffset == 0);
1303                         bcopy(bp->b_data, wipdata->u.data,
1304                               HAMMER2_EMBEDDED_BYTES);
1305                         break;
1306                 case HAMMER2_BREF_TYPE_DATA:
1307                         /*
1308                          * Optimize out the read-before-write
1309                          * if possible.
1310                          */
1311                         *errorp = hammer2_io_newnz(chain->hmp,
1312                                                    chain->bref.data_off,
1313                                                    chain->bytes,
1314                                                    &dio);
1315                         if (*errorp) {
1316                                 hammer2_io_brelse(&dio);
1317                                 kprintf("hammer2: WRITE PATH: "
1318                                         "dbp bread error\n");
1319                                 break;
1320                         }
1321                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1322
1323                         /*
1324                          * When loading the block make sure we don't
1325                          * leave garbage after the compressed data.
1326                          */
1327                         if (comp_size) {
1328                                 chain->bref.methods =
1329                                         HAMMER2_ENC_COMP(comp_algo) +
1330                                         HAMMER2_ENC_CHECK(check_algo);
1331                                 bcopy(comp_buffer, bdata, comp_size);
1332                                 if (comp_size != comp_block_size) {
1333                                         bzero(bdata + comp_size,
1334                                               comp_block_size - comp_size);
1335                                 }
1336                         } else {
1337                                 chain->bref.methods =
1338                                         HAMMER2_ENC_COMP(
1339                                                 HAMMER2_COMP_NONE) +
1340                                         HAMMER2_ENC_CHECK(check_algo);
1341                                 bcopy(bp->b_data, bdata, pblksize);
1342                         }
1343
1344                         /*
1345                          * The flush code doesn't calculate check codes for
1346                          * file data (doing so can result in excessive I/O),
1347                          * so we do it here.
1348                          */
1349                         hammer2_chain_setcheck(chain, bdata);
1350
1351                         /*
1352                          * Device buffer is now valid, chain is no longer in
1353                          * the initial state.
1354                          *
1355                          * (No blockref table worries with file data)
1356                          */
1357                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1358
1359                         /* Now write the related bdp. */
1360                         if (ioflag & IO_SYNC) {
1361                                 /*
1362                                  * Synchronous I/O requested.
1363                                  */
1364                                 hammer2_io_bwrite(&dio);
1365                         /*
1366                         } else if ((ioflag & IO_DIRECT) &&
1367                                    loff + n == pblksize) {
1368                                 hammer2_io_bdwrite(&dio);
1369                         */
1370                         } else if (ioflag & IO_ASYNC) {
1371                                 hammer2_io_bawrite(&dio);
1372                         } else {
1373                                 hammer2_io_bdwrite(&dio);
1374                         }
1375                         break;
1376                 default:
1377                         panic("hammer2_write_bp: bad chain type %d\n",
1378                                 chain->bref.type);
1379                         /* NOT REACHED */
1380                         break;
1381                 }
1382         }
1383 done:
1384         if (cluster)
1385                 hammer2_cluster_unlock(cluster);
1386         if (comp_buffer)
1387                 objcache_put(cache_buffer_write, comp_buffer);
1388 }
1389
1390 /*
1391  * Function that performs zero-checking and writing without compression,
1392  * it corresponds to default zero-checking path.
1393  */
1394 static
1395 void
1396 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1397         hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1398         hammer2_cluster_t *cparent,
1399         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp,
1400         int check_algo)
1401 {
1402         hammer2_cluster_t *cluster;
1403
1404         if (test_block_zeros(bp->b_data, pblksize)) {
1405                 zero_write(bp, trans, ip, ripdata, cparent, lbase, errorp);
1406         } else {
1407                 cluster = hammer2_assign_physical(trans, ip, cparent,
1408                                                   lbase, pblksize, errorp);
1409                 hammer2_write_bp(cluster, bp, ioflag, pblksize, errorp,
1410                                  check_algo);
1411                 if (cluster)
1412                         hammer2_cluster_unlock(cluster);
1413         }
1414 }
1415
1416 /*
1417  * A function to test whether a block of data contains only zeros,
1418  * returns TRUE (non-zero) if the block is all zeros.
1419  */
1420 static
1421 int
1422 test_block_zeros(const char *buf, size_t bytes)
1423 {
1424         size_t i;
1425
1426         for (i = 0; i < bytes; i += sizeof(long)) {
1427                 if (*(const long *)(buf + i) != 0)
1428                         return (0);
1429         }
1430         return (1);
1431 }
1432
1433 /*
1434  * Function to "write" a block that contains only zeros.
1435  */
1436 static
1437 void
1438 zero_write(struct buf *bp, hammer2_trans_t *trans,
1439            hammer2_inode_t *ip, const hammer2_inode_data_t *ripdata,
1440            hammer2_cluster_t *cparent,
1441            hammer2_key_t lbase, int *errorp __unused)
1442 {
1443         hammer2_cluster_t *cluster;
1444         hammer2_media_data_t *data;
1445         hammer2_key_t key_dummy;
1446         int ddflag;
1447
1448         cparent = hammer2_cluster_lookup_init(cparent, 0);
1449         cluster = hammer2_cluster_lookup(cparent, &key_dummy, lbase, lbase,
1450                                      HAMMER2_LOOKUP_NODATA, &ddflag);
1451         if (cluster) {
1452                 data = hammer2_cluster_wdata(cluster);
1453
1454                 if (ddflag) {
1455                         KKASSERT(cluster->focus->flags &
1456                                  HAMMER2_CHAIN_MODIFIED);
1457                         bzero(data->ipdata.u.data, HAMMER2_EMBEDDED_BYTES);
1458                         hammer2_cluster_modsync(cluster);
1459                 } else {
1460                         hammer2_cluster_delete(trans, cparent, cluster,
1461                                                HAMMER2_DELETE_PERMANENT);
1462                 }
1463                 hammer2_cluster_unlock(cluster);
1464         }
1465         hammer2_cluster_lookup_done(cparent);
1466 }
1467
1468 /*
1469  * Function to write the data as it is, without performing any sort of
1470  * compression. This function is used in path without compression and
1471  * default zero-checking path.
1472  */
1473 static
1474 void
1475 hammer2_write_bp(hammer2_cluster_t *cluster, struct buf *bp, int ioflag,
1476                                 int pblksize, int *errorp, int check_algo)
1477 {
1478         hammer2_chain_t *chain;
1479         hammer2_inode_data_t *wipdata;
1480         hammer2_io_t *dio;
1481         char *bdata;
1482         int error;
1483         int i;
1484
1485         error = 0;      /* XXX TODO below */
1486
1487         for (i = 0; i < cluster->nchains; ++i) {
1488                 chain = cluster->array[i];      /* XXX */
1489                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1490
1491                 switch(chain->bref.type) {
1492                 case HAMMER2_BREF_TYPE_INODE:
1493                         wipdata = &hammer2_chain_wdata(chain)->ipdata;
1494                         KKASSERT(wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA);
1495                         KKASSERT(bp->b_loffset == 0);
1496                         bcopy(bp->b_data, wipdata->u.data,
1497                               HAMMER2_EMBEDDED_BYTES);
1498                         error = 0;
1499                         break;
1500                 case HAMMER2_BREF_TYPE_DATA:
1501                         error = hammer2_io_newnz(chain->hmp,
1502                                                  chain->bref.data_off,
1503                                                  chain->bytes, &dio);
1504                         if (error) {
1505                                 hammer2_io_bqrelse(&dio);
1506                                 kprintf("hammer2: WRITE PATH: "
1507                                         "dbp bread error\n");
1508                                 break;
1509                         }
1510                         bdata = hammer2_io_data(dio, chain->bref.data_off);
1511
1512                         chain->bref.methods = HAMMER2_ENC_COMP(
1513                                                         HAMMER2_COMP_NONE) +
1514                                               HAMMER2_ENC_CHECK(check_algo);
1515                         bcopy(bp->b_data, bdata, chain->bytes);
1516
1517                         /*
1518                          * The flush code doesn't calculate check codes for
1519                          * file data (doing so can result in excessive I/O),
1520                          * so we do it here.
1521                          */
1522                         hammer2_chain_setcheck(chain, bdata);
1523
1524                         /*
1525                          * Device buffer is now valid, chain is no longer in
1526                          * the initial state.
1527                          *
1528                          * (No blockref table worries with file data)
1529                          */
1530                         atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1531
1532                         if (ioflag & IO_SYNC) {
1533                                 /*
1534                                  * Synchronous I/O requested.
1535                                  */
1536                                 hammer2_io_bwrite(&dio);
1537                         /*
1538                         } else if ((ioflag & IO_DIRECT) &&
1539                                    loff + n == pblksize) {
1540                                 hammer2_io_bdwrite(&dio);
1541                         */
1542                         } else if (ioflag & IO_ASYNC) {
1543                                 hammer2_io_bawrite(&dio);
1544                         } else {
1545                                 hammer2_io_bdwrite(&dio);
1546                         }
1547                         break;
1548                 default:
1549                         panic("hammer2_write_bp: bad chain type %d\n",
1550                               chain->bref.type);
1551                         /* NOT REACHED */
1552                         error = 0;
1553                         break;
1554                 }
1555                 KKASSERT(error == 0);   /* XXX TODO */
1556         }
1557         *errorp = error;
1558 }
1559
1560 static
1561 int
1562 hammer2_remount(hammer2_mount_t *hmp, struct mount *mp, char *path,
1563                 struct vnode *devvp, struct ucred *cred)
1564 {
1565         int error;
1566
1567         if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1568                 error = hammer2_recovery(hmp);
1569         } else {
1570                 error = 0;
1571         }
1572         return error;
1573 }
1574
1575 static
1576 int
1577 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1578 {
1579         hammer2_pfsmount_t *pmp;
1580         hammer2_mount_t *hmp;
1581         hammer2_chain_t *rchain;
1582         hammer2_cluster_t *cluster;
1583         int flags;
1584         int error = 0;
1585         int i;
1586
1587         pmp = MPTOPMP(mp);
1588
1589         if (pmp == NULL)
1590                 return(0);
1591
1592         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1593         TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
1594
1595         /*
1596          * If mount initialization proceeded far enough we must flush
1597          * its vnodes.
1598          */
1599         if (mntflags & MNT_FORCE)
1600                 flags = FORCECLOSE;
1601         else
1602                 flags = 0;
1603         if (pmp->iroot) {
1604                 error = vflush(mp, 0, flags);
1605                 if (error)
1606                         goto failed;
1607         }
1608
1609         ccms_domain_uninit(&pmp->ccms_dom);
1610
1611         if (pmp->wthread_td) {
1612                 mtx_lock(&pmp->wthread_mtx);
1613                 pmp->wthread_destroy = 1;
1614                 wakeup(&pmp->wthread_bioq);
1615                 while (pmp->wthread_destroy != -1) {
1616                         mtxsleep(&pmp->wthread_destroy,
1617                                 &pmp->wthread_mtx, 0,
1618                                 "umount-sleep", 0);
1619                 }
1620                 mtx_unlock(&pmp->wthread_mtx);
1621                 pmp->wthread_td = NULL;
1622         }
1623
1624         /*
1625          * Cleanup our reference on ihidden.
1626          */
1627         if (pmp->ihidden) {
1628                 hammer2_inode_drop(pmp->ihidden);
1629                 pmp->ihidden = NULL;
1630         }
1631
1632         /*
1633          * Cleanup our reference on iroot.  iroot is (should) not be needed
1634          * by the flush code.
1635          */
1636         if (pmp->iroot) {
1637                 cluster = &pmp->iroot->cluster;
1638                 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1639                         rchain = pmp->iroot->cluster.array[i];
1640                         if (rchain == NULL)
1641                                 continue;
1642                         hmp = rchain->hmp;
1643                         hammer2_vfs_unmount_hmp1(mp, hmp);
1644
1645                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1646 #if REPORT_REFS_ERRORS
1647                         if (rchain->refs != 1)
1648                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1649                                         rchain, rchain->refs);
1650 #else
1651                         KKASSERT(rchain->refs == 1);
1652 #endif
1653                         hammer2_chain_drop(rchain);
1654                         cluster->array[i] = NULL;
1655                         hammer2_vfs_unmount_hmp2(mp, hmp);
1656                 }
1657                 cluster->focus = NULL;
1658
1659 #if REPORT_REFS_ERRORS
1660                 if (pmp->iroot->refs != 1)
1661                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1662                                 pmp->iroot, pmp->iroot->refs);
1663 #else
1664                 KKASSERT(pmp->iroot->refs == 1);
1665 #endif
1666                 /* ref for pmp->iroot */
1667                 hammer2_inode_drop(pmp->iroot);
1668                 pmp->iroot = NULL;
1669         }
1670
1671         pmp->mp = NULL;
1672         mp->mnt_data = NULL;
1673
1674         kmalloc_destroy(&pmp->mmsg);
1675         kmalloc_destroy(&pmp->minode);
1676
1677         kfree(pmp, M_HAMMER2);
1678         error = 0;
1679
1680 failed:
1681         lockmgr(&hammer2_mntlk, LK_RELEASE);
1682
1683         return (error);
1684 }
1685
1686 static
1687 void
1688 hammer2_vfs_unmount_hmp1(struct mount *mp, hammer2_mount_t *hmp)
1689 {
1690         hammer2_mount_exlock(hmp);
1691         --hmp->pmp_count;
1692
1693         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1694
1695         kdmsg_iocom_uninit(&hmp->iocom);        /* XXX chain depend deadlck? */
1696
1697         /*
1698          * Cycle the volume data lock as a safety (probably not needed any
1699          * more).  To ensure everything is out we need to flush at least
1700          * three times.  (1) The running of the unlinkq can dirty the
1701          * filesystem, (2) A normal flush can dirty the freemap, and
1702          * (3) ensure that the freemap is fully synchronized.
1703          *
1704          * The next mount's recovery scan can clean everything up but we want
1705          * to leave the filesystem in a 100% clean state on a normal unmount.
1706          */
1707         hammer2_voldata_lock(hmp);
1708         hammer2_voldata_unlock(hmp);
1709         if (mp->mnt_data) {
1710                 hammer2_vfs_sync(mp, MNT_WAIT);
1711                 hammer2_vfs_sync(mp, MNT_WAIT);
1712                 hammer2_vfs_sync(mp, MNT_WAIT);
1713         }
1714
1715         if (hmp->pmp_count == 0) {
1716                 if ((hmp->vchain.flags | hmp->fchain.flags) &
1717                     HAMMER2_CHAIN_FLUSH_MASK) {
1718                         kprintf("hammer2_unmount: chains left over "
1719                                 "after final sync\n");
1720                         kprintf("    vchain %08x\n", hmp->vchain.flags);
1721                         kprintf("    fchain %08x\n", hmp->fchain.flags);
1722
1723                         if (hammer2_debug & 0x0010)
1724                                 Debugger("entered debugger");
1725                 }
1726         }
1727 }
1728
1729 static
1730 void
1731 hammer2_vfs_unmount_hmp2(struct mount *mp, hammer2_mount_t *hmp)
1732 {
1733         hammer2_pfsmount_t *spmp;
1734         struct vnode *devvp;
1735         int dumpcnt;
1736         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1737
1738         /*
1739          * If no PFS's left drop the master hammer2_mount for the
1740          * device.
1741          */
1742         if (hmp->pmp_count == 0) {
1743                 /*
1744                  * Clean up SPMP and the super-root inode
1745                  */
1746                 spmp = hmp->spmp;
1747                 if (spmp) {
1748                         if (spmp->iroot) {
1749                                 hammer2_inode_drop(spmp->iroot);
1750                                 spmp->iroot = NULL;
1751                         }
1752                         hmp->spmp = NULL;
1753                         kmalloc_destroy(&spmp->mmsg);
1754                         kmalloc_destroy(&spmp->minode);
1755                         kfree(spmp, M_HAMMER2);
1756                 }
1757
1758                 /*
1759                  * Finish up with the device vnode
1760                  */
1761                 if ((devvp = hmp->devvp) != NULL) {
1762                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1763                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1764                         hmp->devvp = NULL;
1765                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1766                         vn_unlock(devvp);
1767                         vrele(devvp);
1768                         devvp = NULL;
1769                 }
1770
1771                 /*
1772                  * Clear vchain/fchain flags that might prevent final cleanup
1773                  * of these chains.
1774                  */
1775                 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1776                         atomic_clear_int(&hmp->vchain.flags,
1777                                          HAMMER2_CHAIN_MODIFIED);
1778                         hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1779                         hammer2_chain_drop(&hmp->vchain);
1780                 }
1781                 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1782                         atomic_clear_int(&hmp->vchain.flags,
1783                                          HAMMER2_CHAIN_UPDATE);
1784                         hammer2_chain_drop(&hmp->vchain);
1785                 }
1786
1787                 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1788                         atomic_clear_int(&hmp->fchain.flags,
1789                                          HAMMER2_CHAIN_MODIFIED);
1790                         hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1791                         hammer2_chain_drop(&hmp->fchain);
1792                 }
1793                 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1794                         atomic_clear_int(&hmp->fchain.flags,
1795                                          HAMMER2_CHAIN_UPDATE);
1796                         hammer2_chain_drop(&hmp->fchain);
1797                 }
1798
1799                 /*
1800                  * Final drop of embedded freemap root chain to
1801                  * clean up fchain.core (fchain structure is not
1802                  * flagged ALLOCATED so it is cleaned out and then
1803                  * left to rot).
1804                  */
1805                 hammer2_chain_drop(&hmp->fchain);
1806
1807                 /*
1808                  * Final drop of embedded volume root chain to clean
1809                  * up vchain.core (vchain structure is not flagged
1810                  * ALLOCATED so it is cleaned out and then left to
1811                  * rot).
1812                  */
1813                 dumpcnt = 50;
1814                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1815                 dumpcnt = 50;
1816                 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1817                 hammer2_mount_unlock(hmp);
1818                 hammer2_chain_drop(&hmp->vchain);
1819
1820                 hammer2_io_cleanup(hmp, &hmp->iotree);
1821                 if (hmp->iofree_count) {
1822                         kprintf("io_cleanup: %d I/O's left hanging\n",
1823                                 hmp->iofree_count);
1824                 }
1825
1826                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1827                 kmalloc_destroy(&hmp->mchain);
1828                 kfree(hmp, M_HAMMER2);
1829         } else {
1830                 hammer2_mount_unlock(hmp);
1831         }
1832 }
1833
1834 static
1835 int
1836 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1837              ino_t ino, struct vnode **vpp)
1838 {
1839         kprintf("hammer2_vget\n");
1840         return (EOPNOTSUPP);
1841 }
1842
1843 static
1844 int
1845 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1846 {
1847         hammer2_pfsmount_t *pmp;
1848         hammer2_cluster_t *cparent;
1849         int error;
1850         struct vnode *vp;
1851
1852         pmp = MPTOPMP(mp);
1853         if (pmp->iroot == NULL) {
1854                 *vpp = NULL;
1855                 error = EINVAL;
1856         } else {
1857                 cparent = hammer2_inode_lock_sh(pmp->iroot);
1858                 vp = hammer2_igetv(pmp->iroot, cparent, &error);
1859                 hammer2_inode_unlock_sh(pmp->iroot, cparent);
1860                 *vpp = vp;
1861                 if (vp == NULL)
1862                         kprintf("vnodefail\n");
1863         }
1864
1865         return (error);
1866 }
1867
1868 /*
1869  * Filesystem status
1870  *
1871  * XXX incorporate ipdata->inode_quota and data_quota
1872  */
1873 static
1874 int
1875 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1876 {
1877         hammer2_pfsmount_t *pmp;
1878         hammer2_mount_t *hmp;
1879
1880         pmp = MPTOPMP(mp);
1881         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1882         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1883
1884         mp->mnt_stat.f_files = pmp->inode_count;
1885         mp->mnt_stat.f_ffree = 0;
1886         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1887         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1888         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1889
1890         *sbp = mp->mnt_stat;
1891         return (0);
1892 }
1893
1894 static
1895 int
1896 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1897 {
1898         hammer2_pfsmount_t *pmp;
1899         hammer2_mount_t *hmp;
1900
1901         pmp = MPTOPMP(mp);
1902         KKASSERT(pmp->iroot->cluster.nchains >= 1);
1903         hmp = pmp->iroot->cluster.focus->hmp;   /* XXX */
1904
1905         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1906         mp->mnt_vstat.f_files = pmp->inode_count;
1907         mp->mnt_vstat.f_ffree = 0;
1908         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1909         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1910         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1911
1912         *sbp = mp->mnt_vstat;
1913         return (0);
1914 }
1915
1916 /*
1917  * Mount-time recovery (RW mounts)
1918  *
1919  * Updates to the free block table are allowed to lag flushes by one
1920  * transaction.  In case of a crash, then on a fresh mount we must do an
1921  * incremental scan of the last committed transaction id and make sure that
1922  * all related blocks have been marked allocated.
1923  *
1924  * The super-root topology and each PFS has its own transaction id domain,
1925  * so we must track PFS boundary transitions.
1926  */
1927 struct hammer2_recovery_elm {
1928         TAILQ_ENTRY(hammer2_recovery_elm) entry;
1929         hammer2_chain_t *chain;
1930         hammer2_tid_t sync_tid;
1931 };
1932
1933 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1934
1935 struct hammer2_recovery_info {
1936         struct hammer2_recovery_list list;
1937         int     depth;
1938 };
1939
1940 static int hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1941                         hammer2_chain_t *parent,
1942                         struct hammer2_recovery_info *info,
1943                         hammer2_tid_t sync_tid);
1944
1945 #define HAMMER2_RECOVERY_MAXDEPTH       10
1946
1947 static
1948 int
1949 hammer2_recovery(hammer2_mount_t *hmp)
1950 {
1951         hammer2_trans_t trans;
1952         struct hammer2_recovery_info info;
1953         struct hammer2_recovery_elm *elm;
1954         hammer2_chain_t *parent;
1955         hammer2_tid_t sync_tid;
1956         int error;
1957         int cumulative_error = 0;
1958
1959         hammer2_trans_init(&trans, hmp->spmp, 0);
1960
1961         sync_tid = 0;
1962         TAILQ_INIT(&info.list);
1963         info.depth = 0;
1964         parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1965         cumulative_error = hammer2_recovery_scan(&trans, hmp, parent,
1966                                                  &info, sync_tid);
1967         hammer2_chain_lookup_done(parent);
1968
1969         while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1970                 TAILQ_REMOVE(&info.list, elm, entry);
1971                 parent = elm->chain;
1972                 sync_tid = elm->sync_tid;
1973                 kfree(elm, M_HAMMER2);
1974
1975                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1976                                            HAMMER2_RESOLVE_NOREF);
1977                 error = hammer2_recovery_scan(&trans, hmp, parent,
1978                                               &info, sync_tid);
1979                 hammer2_chain_unlock(parent);
1980                 if (error)
1981                         cumulative_error = error;
1982         }
1983         hammer2_trans_done(&trans);
1984
1985         return cumulative_error;
1986 }
1987
1988 static
1989 int
1990 hammer2_recovery_scan(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1991                       hammer2_chain_t *parent,
1992                       struct hammer2_recovery_info *info,
1993                       hammer2_tid_t sync_tid)
1994 {
1995         const hammer2_inode_data_t *ripdata;
1996         hammer2_chain_t *chain;
1997         int cache_index;
1998         int cumulative_error = 0;
1999         int pfs_boundary = 0;
2000         int error;
2001
2002         /*
2003          * Adjust freemap to ensure that the block(s) are marked allocated.
2004          */
2005         if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2006                 hammer2_freemap_adjust(trans, hmp, &parent->bref,
2007                                        HAMMER2_FREEMAP_DORECOVER);
2008         }
2009
2010         /*
2011          * Check type for recursive scan
2012          */
2013         switch(parent->bref.type) {
2014         case HAMMER2_BREF_TYPE_VOLUME:
2015                 /* data already instantiated */
2016                 break;
2017         case HAMMER2_BREF_TYPE_INODE:
2018                 /*
2019                  * Must instantiate data for DIRECTDATA test and also
2020                  * for recursion.
2021                  */
2022                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2023                 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2024                 if (ripdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2025                         /* not applicable to recovery scan */
2026                         hammer2_chain_unlock(parent);
2027                         return 0;
2028                 }
2029                 if ((ripdata->op_flags & HAMMER2_OPFLAG_PFSROOT) &&
2030                     info->depth != 0) {
2031                         pfs_boundary = 1;
2032                         sync_tid = parent->bref.mirror_tid - 1;
2033                 }
2034                 hammer2_chain_unlock(parent);
2035                 break;
2036         case HAMMER2_BREF_TYPE_INDIRECT:
2037                 /*
2038                  * Must instantiate data for recursion
2039                  */
2040                 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2041                 hammer2_chain_unlock(parent);
2042                 break;
2043         case HAMMER2_BREF_TYPE_DATA:
2044         case HAMMER2_BREF_TYPE_FREEMAP:
2045         case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2046         case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2047                 /* not applicable to recovery scan */
2048                 return 0;
2049                 break;
2050         default:
2051                 return EDOM;
2052         }
2053
2054         /*
2055          * Defer operation if depth limit reached or if we are crossing a
2056          * PFS boundary.
2057          */
2058         if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH || pfs_boundary) {
2059                 struct hammer2_recovery_elm *elm;
2060
2061                 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2062                 elm->chain = parent;
2063                 elm->sync_tid = sync_tid;
2064                 hammer2_chain_ref(parent);
2065                 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2066                 /* unlocked by caller */
2067
2068                 return(0);
2069         }
2070
2071
2072         /*
2073          * Recursive scan of the last flushed transaction only.  We are
2074          * doing this without pmp assignments so don't leave the chains
2075          * hanging around after we are done with them.
2076          */
2077         cache_index = 0;
2078         chain = hammer2_chain_scan(parent, NULL, &cache_index,
2079                                    HAMMER2_LOOKUP_NODATA);
2080         while (chain) {
2081                 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2082                 if (chain->bref.mirror_tid >= sync_tid) {
2083                         ++info->depth;
2084                         error = hammer2_recovery_scan(trans, hmp, chain,
2085                                                       info, sync_tid);
2086                         --info->depth;
2087                         if (error)
2088                                 cumulative_error = error;
2089                 }
2090                 chain = hammer2_chain_scan(parent, chain, &cache_index,
2091                                            HAMMER2_LOOKUP_NODATA);
2092         }
2093
2094         return cumulative_error;
2095 }
2096
2097 /*
2098  * Sync the entire filesystem; this is called from the filesystem syncer
2099  * process periodically and whenever a user calls sync(1) on the hammer
2100  * mountpoint.
2101  *
2102  * Currently is actually called from the syncer! \o/
2103  *
2104  * This task will have to snapshot the state of the dirty inode chain.
2105  * From that, it will have to make sure all of the inodes on the dirty
2106  * chain have IO initiated. We make sure that io is initiated for the root
2107  * block.
2108  *
2109  * If waitfor is set, we wait for media to acknowledge the new rootblock.
2110  *
2111  * THINKS: side A vs side B, to have sync not stall all I/O?
2112  */
2113 int
2114 hammer2_vfs_sync(struct mount *mp, int waitfor)
2115 {
2116         struct hammer2_sync_info info;
2117         hammer2_inode_t *iroot;
2118         hammer2_chain_t *chain;
2119         hammer2_chain_t *parent;
2120         hammer2_pfsmount_t *pmp;
2121         hammer2_mount_t *hmp;
2122         int flags;
2123         int error;
2124         int total_error;
2125         int force_fchain;
2126         int i;
2127         int j;
2128
2129         pmp = MPTOPMP(mp);
2130         iroot = pmp->iroot;
2131         KKASSERT(iroot);
2132         KKASSERT(iroot->pmp == pmp);
2133
2134         /*
2135          * We can't acquire locks on existing vnodes while in a transaction
2136          * without risking a deadlock.  This assumes that vfsync() can be
2137          * called without the vnode locked (which it can in DragonFly).
2138          * Otherwise we'd have to implement a multi-pass or flag the lock
2139          * failures and retry.
2140          *
2141          * The reclamation code interlocks with the sync list's token
2142          * (by removing the vnode from the scan list) before unlocking
2143          * the inode, giving us time to ref the inode.
2144          */
2145         /*flags = VMSC_GETVP;*/
2146         flags = 0;
2147         if (waitfor & MNT_LAZY)
2148                 flags |= VMSC_ONEPASS;
2149
2150         /*
2151          * Start our flush transaction.  This does not return until all
2152          * concurrent transactions have completed and will prevent any
2153          * new transactions from running concurrently, except for the
2154          * buffer cache transactions.
2155          *
2156          * For efficiency do an async pass before making sure with a
2157          * synchronous pass on all related buffer cache buffers.  It
2158          * should theoretically not be possible for any new file buffers
2159          * to be instantiated during this sequence.
2160          */
2161         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH |
2162                                              HAMMER2_TRANS_PREFLUSH);
2163         hammer2_run_unlinkq(&info.trans, pmp);
2164
2165         info.error = 0;
2166         info.waitfor = MNT_NOWAIT;
2167         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2168         info.waitfor = MNT_WAIT;
2169         vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2170
2171         /*
2172          * Clear PREFLUSH.  This prevents (or asserts on) any new logical
2173          * buffer cache flushes which occur during the flush.  Device buffers
2174          * are not affected.
2175          */
2176
2177 #if 0
2178         if (info.error == 0 && (waitfor & MNT_WAIT)) {
2179                 info.waitfor = waitfor;
2180                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2181
2182         }
2183 #endif
2184         hammer2_bioq_sync(info.trans.pmp);
2185         atomic_clear_int(&info.trans.flags, HAMMER2_TRANS_PREFLUSH);
2186
2187         total_error = 0;
2188
2189         /*
2190          * Flush all storage elements making up the cluster
2191          *
2192          * We must also flush any deleted siblings because the super-root
2193          * flush won't do it for us.  They all must be staged or the
2194          * super-root flush will not be able to update its block table
2195          * properly.
2196          *
2197          * XXX currently done serially instead of concurrently
2198          */
2199         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2200                 chain = iroot->cluster.array[i];
2201                 if (chain) {
2202                         hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
2203                         hammer2_flush(&info.trans, chain);
2204                         hammer2_chain_unlock(chain);
2205                 }
2206         }
2207 #if 0
2208         hammer2_trans_done(&info.trans);
2209 #endif
2210
2211         /*
2212          * Flush all volume roots to synchronize PFS flushes with the
2213          * storage media.  Use a super-root transaction for each one.
2214          *
2215          * The flush code will detect super-root -> pfs-root chain
2216          * transitions using the last pfs-root flush.
2217          */
2218         for (i = 0; iroot && i < iroot->cluster.nchains; ++i) {
2219                 chain = iroot->cluster.array[i];
2220                 if (chain == NULL)
2221                         continue;
2222
2223                 hmp = chain->hmp;
2224
2225                 /*
2226                  * We only have to flush each hmp once
2227                  */
2228                 for (j = i - 1; j >= 0; --j) {
2229                         if (iroot->cluster.array[j] &&
2230                             iroot->cluster.array[j]->hmp == hmp)
2231                                 break;
2232                 }
2233                 if (j >= 0)
2234                         continue;
2235                 hammer2_trans_spmp(&info.trans, hmp->spmp);
2236
2237                 /*
2238                  * Force an update of the XID from the PFS root to the
2239                  * topology root.  We couldn't do this from the PFS
2240                  * transaction because a SPMP transaction is needed.
2241                  * This does not modify blocks, instead what it does is
2242                  * allow the flush code to find the transition point and
2243                  * then update on the way back up.
2244                  */
2245                 parent = chain->parent;
2246                 KKASSERT(chain->pmp != parent->pmp);
2247                 hammer2_chain_setflush(&info.trans, parent);
2248
2249                 /*
2250                  * Media mounts have two 'roots', vchain for the topology
2251                  * and fchain for the free block table.  Flush both.
2252                  *
2253                  * Note that the topology and free block table are handled
2254                  * independently, so the free block table can wind up being
2255                  * ahead of the topology.  We depend on the bulk free scan
2256                  * code to deal with any loose ends.
2257                  */
2258                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2259                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2260                 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2261                         /*
2262                          * This will also modify vchain as a side effect,
2263                          * mark vchain as modified now.
2264                          */
2265                         hammer2_voldata_modify(hmp);
2266                         chain = &hmp->fchain;
2267                         hammer2_flush(&info.trans, chain);
2268                         KKASSERT(chain == &hmp->fchain);
2269                 }
2270                 hammer2_chain_unlock(&hmp->fchain);
2271                 hammer2_chain_unlock(&hmp->vchain);
2272
2273                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
2274                 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
2275                         chain = &hmp->vchain;
2276                         hammer2_flush(&info.trans, chain);
2277                         KKASSERT(chain == &hmp->vchain);
2278                         force_fchain = 1;
2279                 } else {
2280                         force_fchain = 0;
2281                 }
2282                 hammer2_chain_unlock(&hmp->vchain);
2283
2284 #if 0
2285                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
2286                 if ((hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) ||
2287                     force_fchain) {
2288                         /* this will also modify vchain as a side effect */
2289                         chain = &hmp->fchain;
2290                         hammer2_flush(&info.trans, chain);
2291                         KKASSERT(chain == &hmp->fchain);
2292                 }
2293                 hammer2_chain_unlock(&hmp->fchain);
2294 #endif
2295
2296                 error = 0;
2297
2298                 /*
2299                  * We can't safely flush the volume header until we have
2300                  * flushed any device buffers which have built up.
2301                  *
2302                  * XXX this isn't being incremental
2303                  */
2304                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
2305                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
2306                 vn_unlock(hmp->devvp);
2307
2308                 /*
2309                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
2310                  * volume header needs synchronization via hmp->volsync.
2311                  *
2312                  * XXX synchronize the flag & data with only this flush XXX
2313                  */
2314                 if (error == 0 &&
2315                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
2316                         struct buf *bp;
2317
2318                         /*
2319                          * Synchronize the disk before flushing the volume
2320                          * header.
2321                          */
2322                         bp = getpbuf(NULL);
2323                         bp->b_bio1.bio_offset = 0;
2324                         bp->b_bufsize = 0;
2325                         bp->b_bcount = 0;
2326                         bp->b_cmd = BUF_CMD_FLUSH;
2327                         bp->b_bio1.bio_done = biodone_sync;
2328                         bp->b_bio1.bio_flags |= BIO_SYNC;
2329                         vn_strategy(hmp->devvp, &bp->b_bio1);
2330                         biowait(&bp->b_bio1, "h2vol");
2331                         relpbuf(bp, NULL);
2332
2333                         /*
2334                          * Then we can safely flush the version of the
2335                          * volume header synchronized by the flush code.
2336                          */
2337                         i = hmp->volhdrno + 1;
2338                         if (i >= HAMMER2_NUM_VOLHDRS)
2339                                 i = 0;
2340                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
2341                             hmp->volsync.volu_size) {
2342                                 i = 0;
2343                         }
2344                         kprintf("sync volhdr %d %jd\n",
2345                                 i, (intmax_t)hmp->volsync.volu_size);
2346                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2347                                     HAMMER2_PBUFSIZE, 0, 0);
2348                         atomic_clear_int(&hmp->vchain.flags,
2349                                          HAMMER2_CHAIN_VOLUMESYNC);
2350                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
2351                         bawrite(bp);
2352                         hmp->volhdrno = i;
2353                 }
2354                 if (error)
2355                         total_error = error;
2356
2357 #if 0
2358                 hammer2_trans_done(&info.trans);
2359 #endif
2360         }
2361         hammer2_trans_done(&info.trans);
2362
2363         return (total_error);
2364 }
2365
2366 /*
2367  * Sync passes.
2368  */
2369 static int
2370 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2371 {
2372         struct hammer2_sync_info *info = data;
2373         hammer2_inode_t *ip;
2374         int error;
2375
2376         /*
2377          *
2378          */
2379         ip = VTOI(vp);
2380         if (ip == NULL)
2381                 return(0);
2382         if (vp->v_type == VNON || vp->v_type == VBAD) {
2383                 vclrisdirty(vp);
2384                 return(0);
2385         }
2386         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2387             RB_EMPTY(&vp->v_rbdirty_tree)) {
2388                 vclrisdirty(vp);
2389                 return(0);
2390         }
2391
2392         /*
2393          * VOP_FSYNC will start a new transaction so replicate some code
2394          * here to do it inline (see hammer2_vop_fsync()).
2395          *
2396          * WARNING: The vfsync interacts with the buffer cache and might
2397          *          block, we can't hold the inode lock at that time.
2398          *          However, we MUST ref ip before blocking to ensure that
2399          *          it isn't ripped out from under us (since we do not
2400          *          hold a lock on the vnode).
2401          */
2402         hammer2_inode_ref(ip);
2403         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
2404         if (vp)
2405                 vfsync(vp, MNT_NOWAIT, 1, NULL, NULL);
2406
2407         hammer2_inode_drop(ip);
2408 #if 1
2409         error = 0;
2410         if (error)
2411                 info->error = error;
2412 #endif
2413         return(0);
2414 }
2415
2416 static
2417 int
2418 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2419 {
2420         return (0);
2421 }
2422
2423 static
2424 int
2425 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2426                struct fid *fhp, struct vnode **vpp)
2427 {
2428         return (0);
2429 }
2430
2431 static
2432 int
2433 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2434                  int *exflagsp, struct ucred **credanonp)
2435 {
2436         return (0);
2437 }
2438
2439 /*
2440  * Support code for hammer2_vfs_mount().  Read, verify, and install the volume
2441  * header into the HMP
2442  *
2443  * XXX read four volhdrs and use the one with the highest TID whos CRC
2444  *     matches.
2445  *
2446  * XXX check iCRCs.
2447  *
2448  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2449  *     nonexistant locations.
2450  *
2451  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2452  */
2453 static
2454 int
2455 hammer2_install_volume_header(hammer2_mount_t *hmp)
2456 {
2457         hammer2_volume_data_t *vd;
2458         struct buf *bp;
2459         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2460         int error_reported;
2461         int error;
2462         int valid;
2463         int i;
2464
2465         error_reported = 0;
2466         error = 0;
2467         valid = 0;
2468         bp = NULL;
2469
2470         /*
2471          * There are up to 4 copies of the volume header (syncs iterate
2472          * between them so there is no single master).  We don't trust the
2473          * volu_size field so we don't know precisely how large the filesystem
2474          * is, so depend on the OS to return an error if we go beyond the
2475          * block device's EOF.
2476          */
2477         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2478                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2479                               HAMMER2_VOLUME_BYTES, &bp);
2480                 if (error) {
2481                         brelse(bp);
2482                         bp = NULL;
2483                         continue;
2484                 }
2485
2486                 vd = (struct hammer2_volume_data *) bp->b_data;
2487                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2488                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2489                         brelse(bp);
2490                         bp = NULL;
2491                         continue;
2492                 }
2493
2494                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2495                         /* XXX: Reversed-endianness filesystem */
2496                         kprintf("hammer2: reverse-endian filesystem detected");
2497                         brelse(bp);
2498                         bp = NULL;
2499                         continue;
2500                 }
2501
2502                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2503                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2504                                       HAMMER2_VOLUME_ICRC0_SIZE);
2505                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2506                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2507                                        HAMMER2_VOLUME_ICRC1_SIZE);
2508                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2509                         kprintf("hammer2 volume header crc "
2510                                 "mismatch copy #%d %08x/%08x\n",
2511                                 i, crc0, crc);
2512                         error_reported = 1;
2513                         brelse(bp);
2514                         bp = NULL;
2515                         continue;
2516                 }
2517                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2518                         valid = 1;
2519                         hmp->voldata = *vd;
2520                         hmp->volhdrno = i;
2521                 }
2522                 brelse(bp);
2523                 bp = NULL;
2524         }
2525         if (valid) {
2526                 hmp->volsync = hmp->voldata;
2527                 error = 0;
2528                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2529                         kprintf("hammer2: using volume header #%d\n",
2530                                 hmp->volhdrno);
2531                 }
2532         } else {
2533                 error = EINVAL;
2534                 kprintf("hammer2: no valid volume headers found!\n");
2535         }
2536         return (error);
2537 }
2538
2539 /*
2540  * Reconnect using the passed file pointer.  The caller must ref the
2541  * fp for us.
2542  */
2543 void
2544 hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp)
2545 {
2546         size_t name_len;
2547         const char *name = "disk-volume";
2548
2549         /*
2550          * Closes old comm descriptor, kills threads, cleans up
2551          * states, then installs the new descriptor and creates
2552          * new threads.
2553          */
2554         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
2555
2556         /*
2557          * Setup LNK_CONN fields for autoinitiated state machine.  We
2558          * will use SPANs to advertise multiple PFSs so only pass the
2559          * fsid and HAMMER2_PFSTYPE_SUPROOT for the AUTOCONN.
2560          *
2561          * We are not initiating a LNK_SPAN so we do not have to set-up
2562          * iocom.auto_lnk_span.
2563          */
2564         bzero(&hmp->iocom.auto_lnk_conn.pfs_clid,
2565               sizeof(hmp->iocom.auto_lnk_conn.pfs_clid));
2566         hmp->iocom.auto_lnk_conn.pfs_fsid = hmp->voldata.fsid;
2567         hmp->iocom.auto_lnk_conn.pfs_type = HAMMER2_PFSTYPE_SUPROOT;
2568         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
2569 #if 0
2570         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
2571 #endif
2572         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
2573
2574         /*
2575          * Filter adjustment.  Clients do not need visibility into other
2576          * clients (otherwise millions of clients would present a serious
2577          * problem).  The fs_label also serves to restrict the namespace.
2578          */
2579         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
2580         hmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
2581
2582 #if 0
2583         switch (ipdata->pfs_type) {
2584         case DMSG_PFSTYPE_CLIENT:
2585                 hmp->iocom.auto_lnk_conn.peer_mask &=
2586                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
2587                 break;
2588         default:
2589                 break;
2590         }
2591 #endif
2592
2593         name_len = strlen(name);
2594         if (name_len >= sizeof(hmp->iocom.auto_lnk_conn.fs_label))
2595                 name_len = sizeof(hmp->iocom.auto_lnk_conn.fs_label) - 1;
2596         bcopy(name, hmp->iocom.auto_lnk_conn.fs_label, name_len);
2597         hmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2598
2599         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
2600 }
2601
2602 static int
2603 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2604 {
2605         kprintf("RCVMSG %08x\n", msg->tcmd);
2606
2607         switch(msg->tcmd) {
2608         case DMSG_DBG_SHELL:
2609                 /*
2610                  * (non-transaction)
2611                  * Execute shell command (not supported atm)
2612                  */
2613                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
2614                 break;
2615         case DMSG_DBG_SHELL | DMSGF_REPLY:
2616                 /*
2617                  * (non-transaction)
2618                  */
2619                 if (msg->aux_data) {
2620                         msg->aux_data[msg->aux_size - 1] = 0;
2621                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2622                 }
2623                 break;
2624         default:
2625                 /*
2626                  * Unsupported message received.  We only need to
2627                  * reply if it's a transaction in order to close our end.
2628                  * Ignore any one-way messages or any further messages
2629                  * associated with the transaction.
2630                  *
2631                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2632                  *       which might be one-way, replying to those would
2633                  *       cause an infinite ping-pong.
2634                  */
2635                 if (msg->any.head.cmd & DMSGF_CREATE)
2636                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2637                 break;
2638         }
2639         return(0);
2640 }
2641
2642 /*
2643  * This function is called after KDMSG has automatically handled processing
2644  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2645  *
2646  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2647  * advertises all available hammer2 super-root volumes.
2648  */
2649 static void hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state);
2650
2651 static void
2652 hammer2_autodmsg(kdmsg_msg_t *msg)
2653 {
2654         hammer2_mount_t *hmp = msg->state->iocom->handle;
2655         int copyid;
2656
2657         kprintf("RCAMSG %08x\n", msg->tcmd);
2658
2659         switch(msg->tcmd) {
2660         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
2661         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
2662                 if (msg->any.head.cmd & DMSGF_CREATE) {
2663                         kprintf("HAMMER2: VOLDATA DUMP\n");
2664
2665                         /*
2666                          * Dump the configuration stored in the volume header.
2667                          * This will typically be import/export access rights,
2668                          * master encryption keys (encrypted), etc.
2669                          */
2670                         hammer2_voldata_lock(hmp);
2671                         copyid = 0;
2672                         while (copyid < HAMMER2_COPYID_COUNT) {
2673                                 if (hmp->voldata.copyinfo[copyid].copyid)
2674                                         hammer2_volconf_update(hmp, copyid);
2675                                 ++copyid;
2676                         }
2677                         hammer2_voldata_unlock(hmp);
2678
2679                         kprintf("HAMMER2: INITIATE SPANs\n");
2680                         hammer2_update_spans(hmp, msg->state);
2681                 }
2682                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
2683                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2684                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
2685                 }
2686                 break;
2687         default:
2688                 break;
2689         }
2690 }
2691
2692 /*
2693  * Update LNK_SPAN state
2694  */
2695 static void
2696 hammer2_update_spans(hammer2_mount_t *hmp, kdmsg_state_t *state)
2697 {
2698         const hammer2_inode_data_t *ripdata;
2699         hammer2_cluster_t *cparent;
2700         hammer2_cluster_t *cluster;
2701         hammer2_pfsmount_t *spmp;
2702         hammer2_key_t key_next;
2703         kdmsg_msg_t *rmsg;
2704         size_t name_len;
2705         int ddflag;
2706
2707         /*
2708          * Lookup mount point under the media-localized super-root.
2709          *
2710          * cluster->pmp will incorrectly point to spmp and must be fixed
2711          * up later on.
2712          */
2713         spmp = hmp->spmp;
2714         cparent = hammer2_inode_lock_ex(spmp->iroot);
2715         cluster = hammer2_cluster_lookup(cparent, &key_next,
2716                                          HAMMER2_KEY_MIN,
2717                                          HAMMER2_KEY_MAX,
2718                                          0, &ddflag);
2719         while (cluster) {
2720                 if (hammer2_cluster_type(cluster) != HAMMER2_BREF_TYPE_INODE)
2721                         continue;
2722                 ripdata = &hammer2_cluster_rdata(cluster)->ipdata;
2723                 kprintf("UPDATE SPANS: %s\n", ripdata->filename);
2724
2725                 rmsg = kdmsg_msg_alloc(state, DMSG_LNK_SPAN | DMSGF_CREATE,
2726                                        hammer2_lnk_span_reply, NULL);
2727                 rmsg->any.lnk_span.pfs_clid = ripdata->pfs_clid;
2728                 rmsg->any.lnk_span.pfs_fsid = ripdata->pfs_fsid;
2729                 rmsg->any.lnk_span.pfs_type = ripdata->pfs_type;
2730                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
2731                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2732                 name_len = ripdata->name_len;
2733                 if (name_len >= sizeof(rmsg->any.lnk_span.fs_label))
2734                         name_len = sizeof(rmsg->any.lnk_span.fs_label) - 1;
2735                 bcopy(ripdata->filename, rmsg->any.lnk_span.fs_label, name_len);
2736
2737                 kdmsg_msg_write(rmsg);
2738
2739                 cluster = hammer2_cluster_next(cparent, cluster,
2740                                                &key_next,
2741                                                key_next,
2742                                                HAMMER2_KEY_MAX,
2743                                                0);
2744         }
2745         hammer2_inode_unlock_ex(spmp->iroot, cparent);
2746 }
2747
2748 static
2749 int
2750 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
2751 {
2752         if ((state->txcmd & DMSGF_DELETE) == 0 &&
2753             (msg->any.head.cmd & DMSGF_DELETE)) {
2754                 kdmsg_msg_reply(msg, 0);
2755         }
2756         return 0;
2757 }
2758
2759 /*
2760  * Volume configuration updates are passed onto the userland service
2761  * daemon via the open LNK_CONN transaction.
2762  */
2763 void
2764 hammer2_volconf_update(hammer2_mount_t *hmp, int index)
2765 {
2766         kdmsg_msg_t *msg;
2767
2768         /* XXX interlock against connection state termination */
2769         kprintf("volconf update %p\n", hmp->iocom.conn_state);
2770         if (hmp->iocom.conn_state) {
2771                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2772                 msg = kdmsg_msg_alloc(hmp->iocom.conn_state,
2773                                       DMSG_LNK_HAMMER2_VOLCONF,
2774                                       NULL, NULL);
2775                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
2776                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
2777                 H2_LNK_VOLCONF(msg)->index = index;
2778                 kdmsg_msg_write(msg);
2779         }
2780 }
2781
2782 /*
2783  * This handles hysteresis on regular file flushes.  Because the BIOs are
2784  * routed to a thread it is possible for an excessive number to build up
2785  * and cause long front-end stalls long before the runningbuffspace limit
2786  * is hit, so we implement hammer2_flush_pipe to control the
2787  * hysteresis.
2788  *
2789  * This is a particular problem when compression is used.
2790  */
2791 void
2792 hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp)
2793 {
2794         atomic_add_int(&pmp->count_lwinprog, 1);
2795 }
2796
2797 void
2798 hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp)
2799 {
2800         int lwinprog;
2801
2802         lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2803         if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2804             (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2805                 atomic_clear_int(&pmp->count_lwinprog,
2806                                  HAMMER2_LWINPROG_WAITING);
2807                 wakeup(&pmp->count_lwinprog);
2808         }
2809 }
2810
2811 void
2812 hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp)
2813 {
2814         int lwinprog;
2815
2816         for (;;) {
2817                 lwinprog = pmp->count_lwinprog;
2818                 cpu_ccfence();
2819                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2820                         break;
2821                 tsleep_interlock(&pmp->count_lwinprog, 0);
2822                 atomic_set_int(&pmp->count_lwinprog, HAMMER2_LWINPROG_WAITING);
2823                 lwinprog = pmp->count_lwinprog;
2824                 if ((lwinprog & HAMMER2_LWINPROG_MASK) < hammer2_flush_pipe)
2825                         break;
2826                 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2827         }
2828 }
2829
2830 /*
2831  * Manage excessive memory resource use for chain and related
2832  * structures.
2833  */
2834 void
2835 hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp)
2836 {
2837         uint32_t waiting;
2838         uint32_t count;
2839         uint32_t limit;
2840 #if 0
2841         static int zzticks;
2842 #endif
2843
2844         /*
2845          * Atomic check condition and wait.  Also do an early speedup of
2846          * the syncer to try to avoid hitting the wait.
2847          */
2848         for (;;) {
2849                 waiting = pmp->inmem_dirty_chains;
2850                 cpu_ccfence();
2851                 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2852
2853                 limit = pmp->mp->mnt_nvnodelistsize / 10;
2854                 if (limit < hammer2_limit_dirty_chains)
2855                         limit = hammer2_limit_dirty_chains;
2856                 if (limit < 1000)
2857                         limit = 1000;
2858
2859 #if 0
2860                 if ((int)(ticks - zzticks) > hz) {
2861                         zzticks = ticks;
2862                         kprintf("count %ld %ld\n", count, limit);
2863                 }
2864 #endif
2865
2866                 /*
2867                  * Block if there are too many dirty chains present, wait
2868                  * for the flush to clean some out.
2869                  */
2870                 if (count > limit) {
2871                         tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2872                         if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2873                                                waiting,
2874                                        waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2875                                 speedup_syncer(pmp->mp);
2876                                 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2877                                        "chnmem", hz);
2878                         }
2879                         continue;       /* loop on success or fail */
2880                 }
2881
2882                 /*
2883                  * Try to start an early flush before we are forced to block.
2884                  */
2885                 if (count > limit * 7 / 10)
2886                         speedup_syncer(pmp->mp);
2887                 break;
2888         }
2889 }
2890
2891 void
2892 hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp)
2893 {
2894         if (pmp) {
2895                 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2896         }
2897 }
2898
2899 void
2900 hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp)
2901 {
2902         uint32_t waiting;
2903
2904         if (pmp == NULL)
2905                 return;
2906
2907         for (;;) {
2908                 waiting = pmp->inmem_dirty_chains;
2909                 cpu_ccfence();
2910                 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2911                                        waiting,
2912                                        (waiting - 1) &
2913                                         ~HAMMER2_DIRTYCHAIN_WAITING)) {
2914                         break;
2915                 }
2916         }
2917
2918         if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2919                 wakeup(&pmp->inmem_dirty_chains);
2920 }
2921
2922 /*
2923  * Debugging
2924  */
2925 void
2926 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2927 {
2928         hammer2_chain_t *scan;
2929         hammer2_chain_t *parent;
2930
2931         --*countp;
2932         if (*countp == 0) {
2933                 kprintf("%*.*s...\n", tab, tab, "");
2934                 return;
2935         }
2936         if (*countp < 0)
2937                 return;
2938         kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2939                 tab, tab, "", pfx,
2940                 chain, chain->bref.type,
2941                 chain->bref.key, chain->bref.keybits,
2942                 chain->bref.mirror_tid);
2943
2944         kprintf("%*.*s      [%08x] (%s) refs=%d\n",
2945                 tab, tab, "",
2946                 chain->flags,
2947                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2948                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2949                 chain->refs);
2950
2951         kprintf("%*.*s      core [%08x]",
2952                 tab, tab, "",
2953                 chain->core.flags);
2954
2955         parent = chain->parent;
2956         if (parent)
2957                 kprintf("\n%*.*s      p=%p [pflags %08x prefs %d",
2958                         tab, tab, "",
2959                         parent, parent->flags, parent->refs);
2960         if (RB_EMPTY(&chain->core.rbtree)) {
2961                 kprintf("\n");
2962         } else {
2963                 kprintf(" {\n");
2964                 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2965                         hammer2_dump_chain(scan, tab + 4, countp, 'a');
2966                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2967                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2968                                 chain->data->ipdata.filename);
2969                 else
2970                         kprintf("%*.*s}\n", tab, tab, "");
2971         }
2972 }