sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011-2013 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * 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 static struct hammer2_mntlist hammer2_mntlist;
  79 static struct lock hammer2_mntlk;
  80
  81 int hammer2_debug;
  82 int hammer2_cluster_enable = 1;
  83 int hammer2_hardlink_enable = 1;
  84 long hammer2_iod_file_read;
  85 long hammer2_iod_meta_read;
  86 long hammer2_iod_indr_read;
  87 long hammer2_iod_fmap_read;
  88 long hammer2_iod_volu_read;
  89 long hammer2_iod_file_write;
  90 long hammer2_iod_meta_write;
  91 long hammer2_iod_indr_write;
  92 long hammer2_iod_fmap_write;
  93 long hammer2_iod_volu_write;
  94 long hammer2_ioa_file_read;
  95 long hammer2_ioa_meta_read;
  96 long hammer2_ioa_indr_read;
  97 long hammer2_ioa_fmap_read;
  98 long hammer2_ioa_volu_read;
  99 long hammer2_ioa_fmap_write;
 100 long hammer2_ioa_file_write;
 101 long hammer2_ioa_meta_write;
 102 long hammer2_ioa_indr_write;
 103 long hammer2_ioa_volu_write;
 104
 105 MALLOC_DECLARE(C_BUFFER);
 106 MALLOC_DEFINE(C_BUFFER, "compbuffer", "Buffer used for compression.");
 107
 108 MALLOC_DECLARE(D_BUFFER);
 109 MALLOC_DEFINE(D_BUFFER, "decompbuffer", "Buffer used for decompression.");
 110
 111 MALLOC_DECLARE(W_BIOQUEUE);
 112 MALLOC_DEFINE(W_BIOQUEUE, "wbioqueue", "Writing bio queue.");
 113
 114 MALLOC_DECLARE(W_MTX);
 115 MALLOC_DEFINE(W_MTX, "wmutex", "Mutex for write thread.");
 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
 126 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
 127            &hammer2_iod_file_read, 0, "");
 128 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
 129            &hammer2_iod_meta_read, 0, "");
 130 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
 131            &hammer2_iod_indr_read, 0, "");
 132 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
 133            &hammer2_iod_fmap_read, 0, "");
 134 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
 135            &hammer2_iod_volu_read, 0, "");
 136
 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
 138            &hammer2_iod_file_write, 0, "");
 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
 140            &hammer2_iod_meta_write, 0, "");
 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
 142            &hammer2_iod_indr_write, 0, "");
 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
 144            &hammer2_iod_fmap_write, 0, "");
 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
 146            &hammer2_iod_volu_write, 0, "");
 147
 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
 149            &hammer2_ioa_file_read, 0, "");
 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
 151            &hammer2_ioa_meta_read, 0, "");
 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
 153            &hammer2_ioa_indr_read, 0, "");
 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW,
 155            &hammer2_ioa_fmap_read, 0, "");
 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW,
 157            &hammer2_ioa_volu_read, 0, "");
 158
 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
 160            &hammer2_ioa_file_write, 0, "");
 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 162            &hammer2_ioa_meta_write, 0, "");
 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 164            &hammer2_ioa_indr_write, 0, "");
 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW,
 166            &hammer2_ioa_fmap_write, 0, "");
 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 168            &hammer2_ioa_volu_write, 0, "");
 169
 170 static int hammer2_vfs_init(struct vfsconf *conf);
 171 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
 172 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 173                                 struct ucred *cred);
 174 static int hammer2_remount(hammer2_mount_t *, char *, struct vnode *,
 175                                 struct ucred *);
 176 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 177 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 178 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 179                                 struct ucred *cred);
 180 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 181                                 struct ucred *cred);
 182 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 183 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 184                                 ino_t ino, struct vnode **vpp);
 185 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 186                                 struct fid *fhp, struct vnode **vpp);
 187 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 188 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 189                                 int *exflagsp, struct ucred **credanonp);
 190
 191 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 192 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 193
 194 static void hammer2_write_thread(void *arg);
 195
 196 /*
 197  * Functions for compression in threads,
 198  * from hammer2_vnops.c
 199  */
 200 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 201                                 hammer2_inode_t *ip,
 202                                 hammer2_inode_data_t *ipdata,
 203                                 hammer2_chain_t **parentp,
 204                                 hammer2_key_t lbase, int ioflag, int pblksize,
 205                                 int *errorp);
 206 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 207                                 hammer2_inode_t *ip,
 208                                 hammer2_inode_data_t *ipdata,
 209                                 hammer2_chain_t **parentp,
 210                                 hammer2_key_t lbase, int ioflag,
 211                                 int pblksize, int *errorp, int comp_algo);
 212 static void hammer2_zero_check_and_write(struct buf *bp,
 213                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 214                                 hammer2_inode_data_t *ipdata,
 215                                 hammer2_chain_t **parentp,
 216                                 hammer2_key_t lbase,
 217                                 int ioflag, int pblksize, int *errorp);
 218 static int test_block_zeros(const char *buf, size_t bytes);
 219 static void zero_write(struct buf *bp, hammer2_trans_t *trans,
 220                                 hammer2_inode_t *ip,
 221                                 hammer2_inode_data_t *ipdata,
 222                                 hammer2_chain_t **parentp,
 223                                 hammer2_key_t lbase,
 224                                 int *errorp);
 225 static void hammer2_write_bp(hammer2_chain_t *chain, struct buf *bp,
 226                                 int ioflag, int pblksize, int *errorp);
 227
 228 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 229 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 230
 231
 232 /*
 233  * HAMMER2 vfs operations.
 234  */
 235 static struct vfsops hammer2_vfsops = {
 236         .vfs_init       = hammer2_vfs_init,
 237         .vfs_uninit = hammer2_vfs_uninit,
 238         .vfs_sync       = hammer2_vfs_sync,
 239         .vfs_mount      = hammer2_vfs_mount,
 240         .vfs_unmount    = hammer2_vfs_unmount,
 241         .vfs_root       = hammer2_vfs_root,
 242         .vfs_statfs     = hammer2_vfs_statfs,
 243         .vfs_statvfs    = hammer2_vfs_statvfs,
 244         .vfs_vget       = hammer2_vfs_vget,
 245         .vfs_vptofh     = hammer2_vfs_vptofh,
 246         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 247         .vfs_checkexp   = hammer2_vfs_checkexp
 248 };
 249
 250 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 251
 252 VFS_SET(hammer2_vfsops, hammer2, 0);
 253 MODULE_VERSION(hammer2, 1);
 254
 255 static
 256 int
 257 hammer2_vfs_init(struct vfsconf *conf)
 258 {
 259         static struct objcache_malloc_args margs_read;
 260         static struct objcache_malloc_args margs_write;
 261
 262         int error;
 263
 264         error = 0;
 265
 266         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 267                 error = EINVAL;
 268         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 269                 error = EINVAL;
 270         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 271                 error = EINVAL;
 272
 273         if (error)
 274                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 275
 276         margs_read.objsize = 65536;
 277         margs_read.mtype = D_BUFFER;
 278
 279         margs_write.objsize = 32768;
 280         margs_write.mtype = C_BUFFER;
 281
 282         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 283                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 284                                 objcache_malloc_free, &margs_read);
 285         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 286                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 287                                 objcache_malloc_free, &margs_write);
 288
 289         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 290         TAILQ_INIT(&hammer2_mntlist);
 291
 292         return (error);
 293 }
 294
 295 static
 296 int
 297 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 298 {
 299         objcache_destroy(cache_buffer_read);
 300         objcache_destroy(cache_buffer_write);
 301         return 0;
 302 }
 303
 304 /*
 305  * Mount or remount HAMMER2 fileystem from physical media
 306  *
 307  *      mountroot
 308  *              mp              mount point structure
 309  *              path            NULL
 310  *              data            <unused>
 311  *              cred            <unused>
 312  *
 313  *      mount
 314  *              mp              mount point structure
 315  *              path            path to mount point
 316  *              data            pointer to argument structure in user space
 317  *                      volume  volume path (device@LABEL form)
 318  *                      hflags  user mount flags
 319  *              cred            user credentials
 320  *
 321  * RETURNS:     0       Success
 322  *              !0      error number
 323  */
 324 static
 325 int
 326 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 327                   struct ucred *cred)
 328 {
 329         struct hammer2_mount_info info;
 330         hammer2_pfsmount_t *pmp;
 331         hammer2_mount_t *hmp;
 332         hammer2_key_t key_next;
 333         hammer2_key_t key_dummy;
 334         hammer2_key_t lhc;
 335         struct vnode *devvp;
 336         struct nlookupdata nd;
 337         hammer2_chain_t *parent;
 338         hammer2_chain_t *schain;
 339         hammer2_chain_t *rchain;
 340         struct file *fp;
 341         char devstr[MNAMELEN];
 342         size_t size;
 343         size_t done;
 344         char *dev;
 345         char *label;
 346         int ronly = 1;
 347         int error;
 348         int cache_index;
 349         int i;
 350
 351         hmp = NULL;
 352         pmp = NULL;
 353         dev = NULL;
 354         label = NULL;
 355         devvp = NULL;
 356         cache_index = -1;
 357
 358         kprintf("hammer2_mount\n");
 359
 360         if (path == NULL) {
 361                 /*
 362                  * Root mount
 363                  */
 364                 bzero(&info, sizeof(info));
 365                 info.cluster_fd = -1;
 366                 return (EOPNOTSUPP);
 367         } else {
 368                 /*
 369                  * Non-root mount or updating a mount
 370                  */
 371                 error = copyin(data, &info, sizeof(info));
 372                 if (error)
 373                         return (error);
 374
 375                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 376                 if (error)
 377                         return (error);
 378
 379                 /* Extract device and label */
 380                 dev = devstr;
 381                 label = strchr(devstr, '@');
 382                 if (label == NULL ||
 383                     ((label + 1) - dev) > done) {
 384                         return (EINVAL);
 385                 }
 386                 *label = '\0';
 387                 label++;
 388                 if (*label == '\0')
 389                         return (EINVAL);
 390
 391                 if (mp->mnt_flag & MNT_UPDATE) {
 392                         /* Update mount */
 393                         /* HAMMER2 implements NFS export via mountctl */
 394                         pmp = MPTOPMP(mp);
 395                         for (i = 0; i < pmp->cluster.nchains; ++i) {
 396                                 hmp = pmp->cluster.chains[i]->hmp;
 397                                 devvp = hmp->devvp;
 398                                 error = hammer2_remount(hmp, path, devvp, cred);
 399                                 if (error)
 400                                         break;
 401                         }
 402                         return error;
 403                 }
 404         }
 405
 406         /*
 407          * PFS mount
 408          *
 409          * Lookup name and verify it refers to a block device.
 410          */
 411         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 412         if (error == 0)
 413                 error = nlookup(&nd);
 414         if (error == 0)
 415                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 416         nlookup_done(&nd);
 417
 418         if (error == 0) {
 419                 if (vn_isdisk(devvp, &error))
 420                         error = vfs_mountedon(devvp);
 421         }
 422
 423         /*
 424          * Determine if the device has already been mounted.  After this
 425          * check hmp will be non-NULL if we are doing the second or more
 426          * hammer2 mounts from the same device.
 427          */
 428         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 429         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 430                 if (hmp->devvp == devvp)
 431                         break;
 432         }
 433
 434         /*
 435          * Open the device if this isn't a secondary mount and construct
 436          * the H2 device mount (hmp).
 437          */
 438         if (hmp == NULL) {
 439                 if (error == 0 && vcount(devvp) > 0)
 440                         error = EBUSY;
 441
 442                 /*
 443                  * Now open the device
 444                  */
 445                 if (error == 0) {
 446                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 447                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 448                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 449                         if (error == 0) {
 450                                 error = VOP_OPEN(devvp,
 451                                                  ronly ? FREAD : FREAD | FWRITE,
 452                                                  FSCRED, NULL);
 453                         }
 454                         vn_unlock(devvp);
 455                 }
 456                 if (error && devvp) {
 457                         vrele(devvp);
 458                         devvp = NULL;
 459                 }
 460                 if (error) {
 461                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 462                         return error;
 463                 }
 464                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 465                 hmp->ronly = ronly;
 466                 hmp->devvp = devvp;
 467                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 468                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 469
 470                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 471                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 472                 TAILQ_INIT(&hmp->transq);
 473
 474                 /*
 475                  * vchain setup. vchain.data is embedded.
 476                  * vchain.refs is initialized and will never drop to 0.
 477                  */
 478                 hmp->vchain.hmp = hmp;
 479                 hmp->vchain.refs = 1;
 480                 hmp->vchain.data = (void *)&hmp->voldata;
 481                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 482                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 483                 hmp->vchain.delete_tid = HAMMER2_MAX_TID;
 484                 hammer2_chain_core_alloc(NULL, &hmp->vchain, NULL);
 485                 /* hmp->vchain.u.xxx is left NULL */
 486
 487                 /*
 488                  * fchain setup.  fchain.data is embedded.
 489                  * fchain.refs is initialized and will never drop to 0.
 490                  *
 491                  * The data is not used but needs to be initialized to
 492                  * pass assertion muster.  We use this chain primarily
 493                  * as a placeholder for the freemap's top-level RBTREE
 494                  * so it does not interfere with the volume's topology
 495                  * RBTREE.
 496                  */
 497                 hmp->fchain.hmp = hmp;
 498                 hmp->fchain.refs = 1;
 499                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 500                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 501                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 502                 hmp->fchain.bref.methods =
 503                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 504                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 505                 hmp->fchain.delete_tid = HAMMER2_MAX_TID;
 506
 507                 hammer2_chain_core_alloc(NULL, &hmp->fchain, NULL);
 508                 /* hmp->fchain.u.xxx is left NULL */
 509
 510                 /*
 511                  * Install the volume header
 512                  */
 513                 error = hammer2_install_volume_header(hmp);
 514                 if (error) {
 515                         hammer2_vfs_unmount(mp, MNT_FORCE);
 516                         return error;
 517                 }
 518
 519                 /*
 520                  * First locate the super-root inode, which is key 0
 521                  * relative to the volume header's blockset.
 522                  *
 523                  * Then locate the root inode by scanning the directory keyspace
 524                  * represented by the label.
 525                  */
 526                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 527                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 528                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 529                                       &cache_index, 0);
 530                 hammer2_chain_lookup_done(parent);
 531                 if (schain == NULL) {
 532                         kprintf("hammer2_mount: invalid super-root\n");
 533                         hammer2_vfs_unmount(mp, MNT_FORCE);
 534                         return EINVAL;
 535                 }
 536
 537                 /*
 538                  * NOTE: inode_get sucks up schain's lock.
 539                  */
 540                 atomic_set_int(&schain->flags, HAMMER2_CHAIN_PFSROOT);
 541                 hmp->sroot = hammer2_inode_get(NULL, NULL, schain);
 542                 hammer2_inode_ref(hmp->sroot);
 543                 hammer2_inode_unlock_ex(hmp->sroot, schain);
 544                 schain = NULL;
 545                 /* leave hmp->sroot with one ref */
 546         }
 547
 548         /*
 549          * Block device opened successfully, finish initializing the
 550          * mount structure.
 551          *
 552          * From this point on we have to call hammer2_unmount() on failure.
 553          */
 554         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 555
 556         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 557         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 558
 559         spin_init(&pmp->inum_spin);
 560         RB_INIT(&pmp->inum_tree);
 561
 562         kdmsg_iocom_init(&pmp->iocom, pmp,
 563                          KDMSG_IOCOMF_AUTOCONN |
 564                          KDMSG_IOCOMF_AUTOSPAN |
 565                          KDMSG_IOCOMF_AUTOCIRC,
 566                          pmp->mmsg, hammer2_rcvdmsg);
 567
 568         ccms_domain_init(&pmp->ccms_dom);
 569         ++hmp->pmp_count;
 570         lockmgr(&hammer2_mntlk, LK_RELEASE);
 571         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 572                 hmp, pmp, hmp->pmp_count);
 573
 574         mp->mnt_flag = MNT_LOCAL;
 575         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 576         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
 577
 578         /*
 579          * required mount structure initializations
 580          */
 581         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 582         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 583
 584         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 585         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 586
 587         /*
 588          * Optional fields
 589          */
 590         mp->mnt_iosize_max = MAXPHYS;
 591         mp->mnt_data = (qaddr_t)pmp;
 592         pmp->mp = mp;
 593
 594         /*
 595          * Lookup mount point under the media-localized super-root.
 596          */
 597         parent = hammer2_inode_lock_ex(hmp->sroot);
 598         lhc = hammer2_dirhash(label, strlen(label));
 599         rchain = hammer2_chain_lookup(&parent, &key_next,
 600                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 601                                       &cache_index, 0);
 602         while (rchain) {
 603                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 604                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 605                         break;
 606                 }
 607                 rchain = hammer2_chain_next(&parent, rchain, &key_next,
 608                                             key_next,
 609                                             lhc + HAMMER2_DIRHASH_LOMASK,
 610                                             &cache_index, 0);
 611         }
 612         hammer2_inode_unlock_ex(hmp->sroot, parent);
 613
 614         if (rchain == NULL) {
 615                 kprintf("hammer2_mount: PFS label not found\n");
 616                 --hmp->pmp_count;
 617                 hammer2_vfs_unmount(mp, MNT_FORCE);
 618                 return EINVAL;
 619         }
 620         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 621                 hammer2_chain_unlock(rchain);
 622                 kprintf("hammer2_mount: PFS label already mounted!\n");
 623                 --hmp->pmp_count;
 624                 hammer2_vfs_unmount(mp, MNT_FORCE);
 625                 return EBUSY;
 626         }
 627 #if 0
 628         if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 629                 kprintf("hammer2_mount: PFS label currently recycling\n");
 630                 --hmp->pmp_count;
 631                 hammer2_vfs_unmount(mp, MNT_FORCE);
 632                 return EBUSY;
 633         }
 634 #endif
 635
 636         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 637
 638         /*
 639          * NOTE: *_get() integrates chain's lock into the inode lock.
 640          */
 641         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 642         pmp->cluster.nchains = 1;
 643         pmp->cluster.chains[0] = rchain;
 644         pmp->iroot = hammer2_inode_get(pmp, NULL, rchain);
 645         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 646
 647         KKASSERT(rchain->pmp == NULL);          /* tracking pmp for rchain */
 648         rchain->pmp = pmp;
 649         atomic_add_long(&pmp->inmem_chains, 1);
 650
 651         hammer2_inode_unlock_ex(pmp->iroot, rchain);
 652
 653         kprintf("iroot %p\n", pmp->iroot);
 654
 655         /*
 656          * The logical file buffer bio write thread handles things
 657          * like physical block assignment and compression.
 658          */
 659         mtx_init(&pmp->wthread_mtx);
 660         bioq_init(&pmp->wthread_bioq);
 661         pmp->wthread_destroy = 0;
 662         lwkt_create(hammer2_write_thread, pmp,
 663                     &pmp->wthread_td, NULL, 0, -1, "hwrite-%s", label);
 664
 665         /*
 666          * Ref the cluster management messaging descriptor.  The mount
 667          * program deals with the other end of the communications pipe.
 668          */
 669         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 670         if (fp == NULL) {
 671                 kprintf("hammer2_mount: bad cluster_fd!\n");
 672                 hammer2_vfs_unmount(mp, MNT_FORCE);
 673                 return EBADF;
 674         }
 675         hammer2_cluster_reconnect(pmp, fp);
 676
 677         /*
 678          * Finish setup
 679          */
 680         vfs_getnewfsid(mp);
 681         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 682         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 683         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 684
 685         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 686         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 687         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 688         copyinstr(path, mp->mnt_stat.f_mntonname,
 689                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 690                   &size);
 691
 692         /*
 693          * Initial statfs to prime mnt_stat.
 694          */
 695         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 696
 697         return 0;
 698 }
 699
 700 /*
 701  * Handle bioq for strategy write
 702  */
 703 static
 704 void
 705 hammer2_write_thread(void *arg)
 706 {
 707         hammer2_pfsmount_t *pmp;
 708         struct bio *bio;
 709         struct buf *bp;
 710         hammer2_trans_t trans;
 711         struct vnode *vp;
 712         hammer2_inode_t *last_ip;
 713         hammer2_inode_t *ip;
 714         hammer2_chain_t *parent;
 715         hammer2_chain_t **parentp;
 716         hammer2_inode_data_t *ipdata;
 717         hammer2_key_t lbase;
 718         int lblksize;
 719         int pblksize;
 720         int error;
 721
 722         pmp = arg;
 723
 724         mtx_lock(&pmp->wthread_mtx);
 725         while (pmp->wthread_destroy == 0) {
 726                 if (bioq_first(&pmp->wthread_bioq) == NULL) {
 727                         mtxsleep(&pmp->wthread_bioq, &pmp->wthread_mtx,
 728                                  0, "h2bioqw", 0);
 729                 }
 730                 last_ip = NULL;
 731                 parent = NULL;
 732                 parentp = &parent;
 733
 734                 while ((bio = bioq_takefirst(&pmp->wthread_bioq)) != NULL) {
 735                         mtx_unlock(&pmp->wthread_mtx);
 736
 737                         error = 0;
 738                         bp = bio->bio_buf;
 739                         vp = bp->b_vp;
 740                         ip = VTOI(vp);
 741
 742                         /*
 743                          * Cache transaction for multi-buffer flush efficiency.
 744                          * Lock the ip separately for each buffer to allow
 745                          * interleaving with frontend writes.
 746                          */
 747                         if (last_ip != ip) {
 748                                 if (last_ip)
 749                                         hammer2_trans_done(&trans);
 750                                 hammer2_trans_init(&trans, ip->pmp,
 751                                                    HAMMER2_TRANS_BUFCACHE);
 752                                 last_ip = ip;
 753                         }
 754                         parent = hammer2_inode_lock_ex(ip);
 755
 756                         /*
 757                          * Inode is modified, flush size and mtime changes
 758                          * to ensure that the file size remains consistent
 759                          * with the buffers being flushed.
 760                          */
 761                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 762                                          HAMMER2_INODE_MTIME)) {
 763                                 hammer2_inode_fsync(&trans, ip, parentp);
 764                         }
 765                         ipdata = hammer2_chain_modify_ip(&trans, ip,
 766                                                          parentp, 0);
 767                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 768                                                         &lbase, NULL);
 769                         pblksize = hammer2_calc_physical(ip, lbase);
 770                         hammer2_write_file_core(bp, &trans, ip, ipdata,
 771                                                 parentp,
 772                                                 lbase, IO_ASYNC,
 773                                                 pblksize, &error);
 774                         hammer2_inode_unlock_ex(ip, parent);
 775                         if (error) {
 776                                 kprintf("hammer2: error in buffer write\n");
 777                                 bp->b_flags |= B_ERROR;
 778                                 bp->b_error = EIO;
 779                         }
 780                         biodone(bio);
 781                         mtx_lock(&pmp->wthread_mtx);
 782                 }
 783
 784                 /*
 785                  * Clean out transaction cache
 786                  */
 787                 if (last_ip)
 788                         hammer2_trans_done(&trans);
 789         }
 790         pmp->wthread_destroy = -1;
 791         wakeup(&pmp->wthread_destroy);
 792
 793         mtx_unlock(&pmp->wthread_mtx);
 794 }
 795
 796 /*
 797  * Return a chain suitable for I/O, creating the chain if necessary
 798  * and assigning its physical block.
 799  */
 800 static
 801 hammer2_chain_t *
 802 hammer2_assign_physical(hammer2_trans_t *trans,
 803                         hammer2_inode_t *ip, hammer2_chain_t **parentp,
 804                         hammer2_key_t lbase, int pblksize, int *errorp)
 805 {
 806         hammer2_chain_t *parent;
 807         hammer2_chain_t *chain;
 808         hammer2_off_t pbase;
 809         hammer2_key_t key_dummy;
 810         int pradix = hammer2_getradix(pblksize);
 811         int cache_index = -1;
 812
 813         /*
 814          * Locate the chain associated with lbase, return a locked chain.
 815          * However, do not instantiate any data reference (which utilizes a
 816          * device buffer) because we will be using direct IO via the
 817          * logical buffer cache buffer.
 818          */
 819         *errorp = 0;
 820         KKASSERT(pblksize >= HAMMER2_MIN_ALLOC);
 821 retry:
 822         parent = *parentp;
 823         hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); /* extra lock */
 824         chain = hammer2_chain_lookup(&parent, &key_dummy,
 825                                      lbase, lbase,
 826                                      &cache_index, HAMMER2_LOOKUP_NODATA);
 827
 828         if (chain == NULL) {
 829                 /*
 830                  * We found a hole, create a new chain entry.
 831                  *
 832                  * NOTE: DATA chains are created without device backing
 833                  *       store (nor do we want any).
 834                  */
 835                 *errorp = hammer2_chain_create(trans, &parent, &chain,
 836                                                lbase, HAMMER2_PBUFRADIX,
 837                                                HAMMER2_BREF_TYPE_DATA,
 838                                                pblksize);
 839                 if (chain == NULL) {
 840                         hammer2_chain_lookup_done(parent);
 841                         panic("hammer2_chain_create: par=%p error=%d\n",
 842                                 parent, *errorp);
 843                         goto retry;
 844                 }
 845
 846                 pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX;
 847                 /*ip->delta_dcount += pblksize;*/
 848         } else {
 849                 switch (chain->bref.type) {
 850                 case HAMMER2_BREF_TYPE_INODE:
 851                         /*
 852                          * The data is embedded in the inode.  The
 853                          * caller is responsible for marking the inode
 854                          * modified and copying the data to the embedded
 855                          * area.
 856                          */
 857                         pbase = NOOFFSET;
 858                         break;
 859                 case HAMMER2_BREF_TYPE_DATA:
 860                         if (chain->bytes != pblksize) {
 861                                 hammer2_chain_resize(trans, ip,
 862                                                      parent, &chain,
 863                                                      pradix,
 864                                                      HAMMER2_MODIFY_OPTDATA);
 865                         }
 866                         hammer2_chain_modify(trans, &chain,
 867                                              HAMMER2_MODIFY_OPTDATA);
 868                         pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX;
 869                         break;
 870                 default:
 871                         panic("hammer2_assign_physical: bad type");
 872                         /* NOT REACHED */
 873                         pbase = NOOFFSET;
 874                         break;
 875                 }
 876         }
 877
 878         /*
 879          * Cleanup.  If chain wound up being the inode (i.e. DIRECTDATA),
 880          * we might have to replace *parentp.
 881          */
 882         hammer2_chain_lookup_done(parent);
 883         if (chain) {
 884                 if (*parentp != chain &&
 885                     (*parentp)->core == chain->core) {
 886                         parent = *parentp;
 887                         *parentp = chain;               /* eats lock */
 888                         hammer2_chain_unlock(parent);
 889                         hammer2_chain_lock(chain, 0);   /* need another */
 890                 }
 891                 /* else chain already locked for return */
 892         }
 893         return (chain);
 894 }
 895
 896 /*
 897  * From hammer2_vnops.c.
 898  * The core write function which determines which path to take
 899  * depending on compression settings.
 900  */
 901 static
 902 void
 903 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 904                         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
 905                         hammer2_chain_t **parentp,
 906                         hammer2_key_t lbase, int ioflag, int pblksize,
 907                         int *errorp)
 908 {
 909         hammer2_chain_t *chain;
 910
 911         switch(HAMMER2_DEC_COMP(ipdata->comp_algo)) {
 912         case HAMMER2_COMP_NONE:
 913                 /*
 914                  * We have to assign physical storage to the buffer
 915                  * we intend to dirty or write now to avoid deadlocks
 916                  * in the strategy code later.
 917                  *
 918                  * This can return NOOFFSET for inode-embedded data.
 919                  * The strategy code will take care of it in that case.
 920                  */
 921                 chain = hammer2_assign_physical(trans, ip, parentp,
 922                                                 lbase, pblksize,
 923                                                 errorp);
 924                 hammer2_write_bp(chain, bp, ioflag, pblksize, errorp);
 925                 if (chain)
 926                         hammer2_chain_unlock(chain);
 927                 break;
 928         case HAMMER2_COMP_AUTOZERO:
 929                 /*
 930                  * Check for zero-fill only
 931                  */
 932                 hammer2_zero_check_and_write(bp, trans, ip,
 933                                     ipdata, parentp, lbase,
 934                                     ioflag, pblksize, errorp);
 935                 break;
 936         case HAMMER2_COMP_LZ4:
 937         case HAMMER2_COMP_ZLIB:
 938         default:
 939                 /*
 940                  * Check for zero-fill and attempt compression.
 941                  */
 942                 hammer2_compress_and_write(bp, trans, ip,
 943                                            ipdata, parentp,
 944                                            lbase, ioflag,
 945                                            pblksize, errorp,
 946                                            ipdata->comp_algo);
 947                 break;
 948         }
 949         ipdata = &ip->chain->data->ipdata;      /* reload */
 950 }
 951
 952 /*
 953  * From hammer2_vnops.c
 954  * Generic function that will perform the compression in compression
 955  * write path. The compression algorithm is determined by the settings
 956  * obtained from inode.
 957  */
 958 static
 959 void
 960 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 961         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
 962         hammer2_chain_t **parentp,
 963         hammer2_key_t lbase, int ioflag, int pblksize,
 964         int *errorp, int comp_algo)
 965 {
 966         hammer2_chain_t *chain;
 967         int comp_size;
 968         int comp_block_size;
 969         char *comp_buffer;
 970
 971         if (test_block_zeros(bp->b_data, pblksize)) {
 972                 zero_write(bp, trans, ip, ipdata, parentp, lbase, errorp);
 973                 return;
 974         }
 975
 976         comp_size = 0;
 977         comp_buffer = NULL;
 978
 979         KKASSERT(pblksize / 2 <= 32768);
 980
 981         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
 982                 z_stream strm_compress;
 983                 int comp_level;
 984                 int ret;
 985
 986                 switch(HAMMER2_DEC_COMP(comp_algo)) {
 987                 case HAMMER2_COMP_LZ4:
 988                         comp_buffer = objcache_get(cache_buffer_write,
 989                                                    M_INTWAIT);
 990                         comp_size = LZ4_compress_limitedOutput(
 991                                         bp->b_data,
 992                                         &comp_buffer[sizeof(int)],
 993                                         pblksize,
 994                                         pblksize / 2 - sizeof(int));
 995                         /*
 996                          * We need to prefix with the size, LZ4
 997                          * doesn't do it for us.  Add the related
 998                          * overhead.
 999                          */
1000                         *(int *)comp_buffer = comp_size;
1001                         if (comp_size)
1002                                 comp_size += sizeof(int);
1003                         break;
1004                 case HAMMER2_COMP_ZLIB:
1005                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
1006                         if (comp_level == 0)
1007                                 comp_level = 6; /* default zlib compression */
1008                         else if (comp_level < 6)
1009                                 comp_level = 6;
1010                         else if (comp_level > 9)
1011                                 comp_level = 9;
1012                         ret = deflateInit(&strm_compress, comp_level);
1013                         if (ret != Z_OK) {
1014                                 kprintf("HAMMER2 ZLIB: fatal error "
1015                                         "on deflateInit.\n");
1016                         }
1017
1018                         comp_buffer = objcache_get(cache_buffer_write,
1019                                                    M_INTWAIT);
1020                         strm_compress.next_in = bp->b_data;
1021                         strm_compress.avail_in = pblksize;
1022                         strm_compress.next_out = comp_buffer;
1023                         strm_compress.avail_out = pblksize / 2;
1024                         ret = deflate(&strm_compress, Z_FINISH);
1025                         if (ret == Z_STREAM_END) {
1026                                 comp_size = pblksize / 2 -
1027                                             strm_compress.avail_out;
1028                         } else {
1029                                 comp_size = 0;
1030                         }
1031                         ret = deflateEnd(&strm_compress);
1032                         break;
1033                 default:
1034                         kprintf("Error: Unknown compression method.\n");
1035                         kprintf("Comp_method = %d.\n", comp_algo);
1036                         break;
1037                 }
1038         }
1039
1040         if (comp_size == 0) {
1041                 /*
1042                  * compression failed or turned off
1043                  */
1044                 comp_block_size = pblksize;     /* safety */
1045                 if (++ip->comp_heuristic > 128)
1046                         ip->comp_heuristic = 8;
1047         } else {
1048                 /*
1049                  * compression succeeded
1050                  */
1051                 ip->comp_heuristic = 0;
1052                 if (comp_size <= 1024) {
1053                         comp_block_size = 1024;
1054                 } else if (comp_size <= 2048) {
1055                         comp_block_size = 2048;
1056                 } else if (comp_size <= 4096) {
1057                         comp_block_size = 4096;
1058                 } else if (comp_size <= 8192) {
1059                         comp_block_size = 8192;
1060                 } else if (comp_size <= 16384) {
1061                         comp_block_size = 16384;
1062                 } else if (comp_size <= 32768) {
1063                         comp_block_size = 32768;
1064                 } else {
1065                         panic("hammer2: WRITE PATH: "
1066                               "Weird comp_size value.");
1067                         /* NOT REACHED */
1068                         comp_block_size = pblksize;
1069                 }
1070         }
1071
1072         chain = hammer2_assign_physical(trans, ip, parentp,
1073                                         lbase, comp_block_size,
1074                                         errorp);
1075         ipdata = &ip->chain->data->ipdata;      /* RELOAD */
1076
1077         if (*errorp) {
1078                 kprintf("WRITE PATH: An error occurred while "
1079                         "assigning physical space.\n");
1080                 KKASSERT(chain == NULL);
1081         } else {
1082                 /* Get device offset */
1083                 hammer2_off_t pbase;
1084                 hammer2_off_t pmask;
1085                 hammer2_off_t peof;
1086                 size_t boff;
1087                 size_t psize;
1088                 struct buf *dbp;
1089                 int temp_check;
1090
1091                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1092
1093                 switch(chain->bref.type) {
1094                 case HAMMER2_BREF_TYPE_INODE:
1095                         KKASSERT(chain->data->ipdata.op_flags &
1096                                  HAMMER2_OPFLAG_DIRECTDATA);
1097                         KKASSERT(bp->b_loffset == 0);
1098                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1099                               HAMMER2_EMBEDDED_BYTES);
1100                         break;
1101                 case HAMMER2_BREF_TYPE_DATA:
1102                         psize = hammer2_devblksize(chain->bytes);
1103                         pmask = (hammer2_off_t)psize - 1;
1104                         pbase = chain->bref.data_off & ~pmask;
1105                         boff = chain->bref.data_off &
1106                                (HAMMER2_OFF_MASK & pmask);
1107                         peof = (pbase + HAMMER2_SEGMASK64) &
1108                                ~HAMMER2_SEGMASK64;
1109                         temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1110
1111                         /*
1112                          * Optimize out the read-before-write
1113                          * if possible.
1114                          */
1115                         if (comp_block_size == psize) {
1116                                 dbp = getblk(chain->hmp->devvp, pbase,
1117                                              psize, 0, 0);
1118                         } else {
1119                                 *errorp = bread(chain->hmp->devvp,
1120                                                 pbase, psize, &dbp);
1121                                 if (*errorp) {
1122                                         kprintf("hammer2: WRITE PATH: "
1123                                                 "dbp bread error\n");
1124                                         break;
1125                                 }
1126                         }
1127
1128                         /*
1129                          * When loading the block make sure we don't
1130                          * leave garbage after the compressed data.
1131                          */
1132                         if (comp_size) {
1133                                 chain->bref.methods =
1134                                         HAMMER2_ENC_COMP(comp_algo) +
1135                                         HAMMER2_ENC_CHECK(temp_check);
1136                                 bcopy(comp_buffer, dbp->b_data + boff,
1137                                       comp_size);
1138                                 if (comp_size != comp_block_size) {
1139                                         bzero(dbp->b_data + boff +
1140                                                 comp_size,
1141                                               comp_block_size -
1142                                                 comp_size);
1143                                 }
1144                         } else {
1145                                 chain->bref.methods =
1146                                         HAMMER2_ENC_COMP(
1147                                                 HAMMER2_COMP_NONE) +
1148                                         HAMMER2_ENC_CHECK(temp_check);
1149                                 bcopy(bp->b_data, dbp->b_data + boff,
1150                                       pblksize);
1151                         }
1152
1153                         /*
1154                          * Device buffer is now valid, chain is no
1155                          * longer in the initial state.
1156                          */
1157                         atomic_clear_int(&chain->flags,
1158                                          HAMMER2_CHAIN_INITIAL);
1159
1160                         /* Now write the related bdp. */
1161                         if (ioflag & IO_SYNC) {
1162                                 /*
1163                                  * Synchronous I/O requested.
1164                                  */
1165                                 bwrite(dbp);
1166                         /*
1167                         } else if ((ioflag & IO_DIRECT) &&
1168                                    loff + n == pblksize) {
1169                                 bdwrite(dbp);
1170                         */
1171                         } else if (ioflag & IO_ASYNC) {
1172                                 bawrite(dbp);
1173                         } else if (hammer2_cluster_enable) {
1174                                 cluster_write(dbp, peof,
1175                                               HAMMER2_PBUFSIZE,
1176                                               4/*XXX*/);
1177                         } else {
1178                                 bdwrite(dbp);
1179                         }
1180                         break;
1181                 default:
1182                         panic("hammer2_write_bp: bad chain type %d\n",
1183                                 chain->bref.type);
1184                         /* NOT REACHED */
1185                         break;
1186                 }
1187
1188                 hammer2_chain_unlock(chain);
1189         }
1190         if (comp_buffer)
1191                 objcache_put(cache_buffer_write, comp_buffer);
1192 }
1193
1194 /*
1195  * Function that performs zero-checking and writing without compression,
1196  * it corresponds to default zero-checking path.
1197  */
1198 static
1199 void
1200 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1201         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
1202         hammer2_chain_t **parentp,
1203         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp)
1204 {
1205         hammer2_chain_t *chain;
1206
1207         if (test_block_zeros(bp->b_data, pblksize)) {
1208                 zero_write(bp, trans, ip, ipdata, parentp, lbase, errorp);
1209         } else {
1210                 chain = hammer2_assign_physical(trans, ip, parentp,
1211                                                 lbase, pblksize, errorp);
1212                 hammer2_write_bp(chain, bp, ioflag, pblksize, errorp);
1213                 if (chain)
1214                         hammer2_chain_unlock(chain);
1215         }
1216 }
1217
1218 /*
1219  * A function to test whether a block of data contains only zeros,
1220  * returns TRUE (non-zero) if the block is all zeros.
1221  */
1222 static
1223 int
1224 test_block_zeros(const char *buf, size_t bytes)
1225 {
1226         size_t i;
1227
1228         for (i = 0; i < bytes; i += sizeof(long)) {
1229                 if (*(const long *)(buf + i) != 0)
1230                         return (0);
1231         }
1232         return (1);
1233 }
1234
1235 /*
1236  * Function to "write" a block that contains only zeros.
1237  */
1238 static
1239 void
1240 zero_write(struct buf *bp, hammer2_trans_t *trans, hammer2_inode_t *ip,
1241         hammer2_inode_data_t *ipdata, hammer2_chain_t **parentp,
1242         hammer2_key_t lbase, int *errorp __unused)
1243 {
1244         hammer2_chain_t *parent;
1245         hammer2_chain_t *chain;
1246         hammer2_key_t key_dummy;
1247         int cache_index = -1;
1248
1249         parent = hammer2_chain_lookup_init(*parentp, 0);
1250
1251         chain = hammer2_chain_lookup(&parent, &key_dummy, lbase, lbase,
1252                                      &cache_index, HAMMER2_LOOKUP_NODATA);
1253         if (chain) {
1254                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) {
1255                         bzero(chain->data->ipdata.u.data,
1256                               HAMMER2_EMBEDDED_BYTES);
1257                 } else {
1258                         hammer2_chain_delete(trans, chain, 0);
1259                 }
1260                 hammer2_chain_unlock(chain);
1261         }
1262         hammer2_chain_lookup_done(parent);
1263 }
1264
1265 /*
1266  * Function to write the data as it is, without performing any sort of
1267  * compression. This function is used in path without compression and
1268  * default zero-checking path.
1269  */
1270 static
1271 void
1272 hammer2_write_bp(hammer2_chain_t *chain, struct buf *bp, int ioflag,
1273                                 int pblksize, int *errorp)
1274 {
1275         hammer2_off_t pbase;
1276         hammer2_off_t pmask;
1277         hammer2_off_t peof;
1278         struct buf *dbp;
1279         size_t boff;
1280         size_t psize;
1281         int error;
1282         int temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1283
1284         KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1285
1286         switch(chain->bref.type) {
1287         case HAMMER2_BREF_TYPE_INODE:
1288                 KKASSERT(chain->data->ipdata.op_flags &
1289                          HAMMER2_OPFLAG_DIRECTDATA);
1290                 KKASSERT(bp->b_loffset == 0);
1291                 bcopy(bp->b_data, chain->data->ipdata.u.data,
1292                       HAMMER2_EMBEDDED_BYTES);
1293                 error = 0;
1294                 break;
1295         case HAMMER2_BREF_TYPE_DATA:
1296                 psize = hammer2_devblksize(chain->bytes);
1297                 pmask = (hammer2_off_t)psize - 1;
1298                 pbase = chain->bref.data_off & ~pmask;
1299                 boff = chain->bref.data_off & (HAMMER2_OFF_MASK & pmask);
1300                 peof = (pbase + HAMMER2_SEGMASK64) & ~HAMMER2_SEGMASK64;
1301
1302                 if (psize == pblksize) {
1303                         dbp = getblk(chain->hmp->devvp, pbase,
1304                                      psize, 0, 0);
1305                         error = 0;
1306                 } else {
1307                         error = bread(chain->hmp->devvp, pbase, psize, &dbp);
1308                         if (error) {
1309                                 kprintf("hammer2: WRITE PATH: "
1310                                         "dbp bread error\n");
1311                                 break;
1312                         }
1313                 }
1314
1315                 chain->bref.methods = HAMMER2_ENC_COMP(HAMMER2_COMP_NONE) +
1316                                       HAMMER2_ENC_CHECK(temp_check);
1317                 bcopy(bp->b_data, dbp->b_data + boff, chain->bytes);
1318
1319                 /*
1320                  * Device buffer is now valid, chain is no
1321                  * longer in the initial state.
1322                  */
1323                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1324
1325                 if (ioflag & IO_SYNC) {
1326                         /*
1327                          * Synchronous I/O requested.
1328                          */
1329                         bwrite(dbp);
1330                 /*
1331                 } else if ((ioflag & IO_DIRECT) && loff + n == pblksize) {
1332                         bdwrite(dbp);
1333                 */
1334                 } else if (ioflag & IO_ASYNC) {
1335                         bawrite(dbp);
1336                 } else if (hammer2_cluster_enable) {
1337                         cluster_write(dbp, peof, HAMMER2_PBUFSIZE, 4/*XXX*/);
1338                 } else {
1339                         bdwrite(dbp);
1340                 }
1341                 break;
1342         default:
1343                 panic("hammer2_write_bp: bad chain type %d\n",
1344                       chain->bref.type);
1345                 /* NOT REACHED */
1346                 error = 0;
1347                 break;
1348         }
1349         *errorp = error;
1350 }
1351
1352 static
1353 int
1354 hammer2_remount(hammer2_mount_t *hmp, char *path, struct vnode *devvp,
1355                 struct ucred *cred)
1356 {
1357         return (0);
1358 }
1359
1360 static
1361 int
1362 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1363 {
1364         hammer2_pfsmount_t *pmp;
1365         hammer2_mount_t *hmp;
1366         hammer2_chain_t *rchain;
1367         int flags;
1368         int error = 0;
1369         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1370         int dumpcnt;
1371         int i;
1372         struct vnode *devvp;
1373
1374         pmp = MPTOPMP(mp);
1375
1376         ccms_domain_uninit(&pmp->ccms_dom);
1377         kdmsg_iocom_uninit(&pmp->iocom);        /* XXX chain dependency */
1378
1379         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1380
1381         /*
1382          * If mount initialization proceeded far enough we must flush
1383          * its vnodes.
1384          */
1385         if (mntflags & MNT_FORCE)
1386                 flags = FORCECLOSE;
1387         else
1388                 flags = 0;
1389         if (pmp->iroot) {
1390                 error = vflush(mp, 0, flags);
1391                 if (error)
1392                         goto failed;
1393         }
1394
1395         if (pmp->wthread_td) {
1396                 mtx_lock(&pmp->wthread_mtx);
1397                 pmp->wthread_destroy = 1;
1398                 wakeup(&pmp->wthread_bioq);
1399                 while (pmp->wthread_destroy != -1) {
1400                         mtxsleep(&pmp->wthread_destroy,
1401                                 &pmp->wthread_mtx, 0,
1402                                 "umount-sleep", 0);
1403                 }
1404                 mtx_unlock(&pmp->wthread_mtx);
1405                 pmp->wthread_td = NULL;
1406         }
1407
1408         for (i = 0; i < pmp->cluster.nchains; ++i) {
1409                 hmp = pmp->cluster.chains[i]->hmp;
1410
1411                 hammer2_mount_exlock(hmp);
1412
1413                 --hmp->pmp_count;
1414                 kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n",
1415                         hmp, hmp->pmp_count);
1416
1417                 /*
1418                  * Flush any left over chains.  The voldata lock is only used
1419                  * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
1420                  */
1421                 hammer2_voldata_lock(hmp);
1422                 if ((hmp->vchain.flags | hmp->fchain.flags) &
1423                     (HAMMER2_CHAIN_MODIFIED | HAMMER2_CHAIN_SUBMODIFIED)) {
1424                         hammer2_voldata_unlock(hmp, 0);
1425                         hammer2_vfs_sync(mp, MNT_WAIT);
1426                         hammer2_vfs_sync(mp, MNT_WAIT);
1427                 } else {
1428                         hammer2_voldata_unlock(hmp, 0);
1429                 }
1430                 if (hmp->pmp_count == 0) {
1431                         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
1432                                                  HAMMER2_CHAIN_SUBMODIFIED)) {
1433                                 kprintf("hammer2_unmount: chains left over "
1434                                         "after final sync\n");
1435                                 if (hammer2_debug & 0x0010)
1436                                         Debugger("entered debugger");
1437                         }
1438                 }
1439
1440                 /*
1441                  * Cleanup the root and super-root chain elements
1442                  * (which should be clean).
1443                  */
1444                 if (pmp->iroot) {
1445 #if REPORT_REFS_ERRORS
1446                         if (pmp->iroot->refs != 1)
1447                                 kprintf("PMP->IROOT %p REFS WRONG %d\n",
1448                                         pmp->iroot, pmp->iroot->refs);
1449 #else
1450                         KKASSERT(pmp->iroot->refs == 1);
1451 #endif
1452                         /* ref for pmp->iroot */
1453                         hammer2_inode_drop(pmp->iroot);
1454                         pmp->iroot = NULL;
1455                 }
1456
1457                 rchain = pmp->cluster.chains[i];
1458                 if (rchain) {
1459                         atomic_clear_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
1460 #if REPORT_REFS_ERRORS
1461                         if (rchain->refs != 1)
1462                                 kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1463                                         rchain, rchain->refs);
1464 #else
1465                         KKASSERT(rchain->refs == 1);
1466 #endif
1467                         hammer2_chain_drop(rchain);
1468                         pmp->cluster.chains[i] = NULL;
1469                 }
1470
1471                 /*
1472                  * If no PFS's left drop the master hammer2_mount for the
1473                  * device.
1474                  */
1475                 if (hmp->pmp_count == 0) {
1476                         if (hmp->sroot) {
1477                                 hammer2_inode_drop(hmp->sroot);
1478                                 hmp->sroot = NULL;
1479                         }
1480
1481                         /*
1482                          * Finish up with the device vnode
1483                          */
1484                         if ((devvp = hmp->devvp) != NULL) {
1485                                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1486                                 hmp->devvp = NULL;
1487                                 VOP_CLOSE(devvp,
1488                                           (ronly ? FREAD : FREAD|FWRITE));
1489                                 vrele(devvp);
1490                                 devvp = NULL;
1491                         }
1492
1493                         /*
1494                          * Final drop of embedded freemap root chain to
1495                          * clean up fchain.core (fchain structure is not
1496                          * flagged ALLOCATED so it is cleaned out and then
1497                          * left to rot).
1498                          */
1499                         hammer2_chain_drop(&hmp->fchain);
1500
1501                         /*
1502                          * Final drop of embedded volume root chain to clean
1503                          * up vchain.core (vchain structure is not flagged
1504                          * ALLOCATED so it is cleaned out and then left to
1505                          * rot).
1506                          */
1507                         dumpcnt = 50;
1508                         hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
1509                         hammer2_mount_unlock(hmp);
1510                         hammer2_chain_drop(&hmp->vchain);
1511
1512                         TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1513                         kmalloc_destroy(&hmp->mchain);
1514                         kfree(hmp, M_HAMMER2);
1515                 } else {
1516                         hammer2_mount_unlock(hmp);
1517                 }
1518         }
1519
1520         pmp->mp = NULL;
1521         mp->mnt_data = NULL;
1522
1523         kmalloc_destroy(&pmp->mmsg);
1524         kmalloc_destroy(&pmp->minode);
1525
1526         kfree(pmp, M_HAMMER2);
1527         error = 0;
1528
1529 failed:
1530         lockmgr(&hammer2_mntlk, LK_RELEASE);
1531
1532         return (error);
1533 }
1534
1535 static
1536 int
1537 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1538              ino_t ino, struct vnode **vpp)
1539 {
1540         kprintf("hammer2_vget\n");
1541         return (EOPNOTSUPP);
1542 }
1543
1544 static
1545 int
1546 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1547 {
1548         hammer2_pfsmount_t *pmp;
1549         hammer2_chain_t *parent;
1550         int error;
1551         struct vnode *vp;
1552
1553         pmp = MPTOPMP(mp);
1554         if (pmp->iroot == NULL) {
1555                 *vpp = NULL;
1556                 error = EINVAL;
1557         } else {
1558                 parent = hammer2_inode_lock_sh(pmp->iroot);
1559                 vp = hammer2_igetv(pmp->iroot, &error);
1560                 hammer2_inode_unlock_sh(pmp->iroot, parent);
1561                 *vpp = vp;
1562                 if (vp == NULL)
1563                         kprintf("vnodefail\n");
1564         }
1565
1566         return (error);
1567 }
1568
1569 /*
1570  * Filesystem status
1571  *
1572  * XXX incorporate ipdata->inode_quota and data_quota
1573  */
1574 static
1575 int
1576 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1577 {
1578         hammer2_pfsmount_t *pmp;
1579         hammer2_mount_t *hmp;
1580
1581         pmp = MPTOPMP(mp);
1582         KKASSERT(pmp->cluster.nchains >= 1);
1583         hmp = pmp->cluster.chains[0]->hmp;      /* XXX */
1584
1585         mp->mnt_stat.f_files = pmp->inode_count;
1586         mp->mnt_stat.f_ffree = 0;
1587         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1588         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1589         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1590
1591         *sbp = mp->mnt_stat;
1592         return (0);
1593 }
1594
1595 static
1596 int
1597 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1598 {
1599         hammer2_pfsmount_t *pmp;
1600         hammer2_mount_t *hmp;
1601
1602         pmp = MPTOPMP(mp);
1603         KKASSERT(pmp->cluster.nchains >= 1);
1604         hmp = pmp->cluster.chains[0]->hmp;      /* XXX */
1605
1606         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1607         mp->mnt_vstat.f_files = pmp->inode_count;
1608         mp->mnt_vstat.f_ffree = 0;
1609         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1610         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1611         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1612
1613         *sbp = mp->mnt_vstat;
1614         return (0);
1615 }
1616
1617 /*
1618  * Sync the entire filesystem; this is called from the filesystem syncer
1619  * process periodically and whenever a user calls sync(1) on the hammer
1620  * mountpoint.
1621  *
1622  * Currently is actually called from the syncer! \o/
1623  *
1624  * This task will have to snapshot the state of the dirty inode chain.
1625  * From that, it will have to make sure all of the inodes on the dirty
1626  * chain have IO initiated. We make sure that io is initiated for the root
1627  * block.
1628  *
1629  * If waitfor is set, we wait for media to acknowledge the new rootblock.
1630  *
1631  * THINKS: side A vs side B, to have sync not stall all I/O?
1632  */
1633 static
1634 int
1635 hammer2_vfs_sync(struct mount *mp, int waitfor)
1636 {
1637         struct hammer2_sync_info info;
1638         hammer2_pfsmount_t *pmp;
1639         hammer2_mount_t *hmp;
1640         int flags;
1641         int error;
1642         int total_error;
1643         int i;
1644
1645         pmp = MPTOPMP(mp);
1646
1647         /*
1648          * We can't acquire locks on existing vnodes while in a transaction
1649          * without risking a deadlock.  This assumes that vfsync() can be
1650          * called without the vnode locked (which it can in DragonFly).
1651          * Otherwise we'd have to implement a multi-pass or flag the lock
1652          * failures and retry.
1653          */
1654         /*flags = VMSC_GETVP;*/
1655         flags = 0;
1656         if (waitfor & MNT_LAZY)
1657                 flags |= VMSC_ONEPASS;
1658
1659         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH);
1660
1661         /*
1662          * vfsync the vnodes. XXX
1663          */
1664         info.error = 0;
1665         info.waitfor = MNT_NOWAIT;
1666         vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
1667         if (info.error == 0 && (waitfor & MNT_WAIT)) {
1668                 info.waitfor = waitfor;
1669                     vsyncscan(mp, flags, hammer2_sync_scan2, &info);
1670
1671         }
1672 #if 0
1673         if (waitfor == MNT_WAIT) {
1674                 /* XXX */
1675         } else {
1676                 /* XXX */
1677         }
1678 #endif
1679
1680         total_error = 0;
1681         for (i = 0; i < pmp->cluster.nchains; ++i) {
1682                 hmp = pmp->cluster.chains[i]->hmp;
1683
1684                 /*
1685                  * Media mounts have two 'roots', vchain for the topology
1686                  * and fchain for the free block table.  Flush both.
1687                  *
1688                  * Note that the topology and free block table are handled
1689                  * independently, so the free block table can wind up being
1690                  * ahead of the topology.  We depend on the bulk free scan
1691                  * code to deal with any loose ends.
1692                  */
1693                 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1694                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
1695                                           HAMMER2_CHAIN_SUBMODIFIED)) {
1696                         hammer2_chain_flush(&info.trans, &hmp->vchain);
1697                 }
1698                 hammer2_chain_unlock(&hmp->vchain);
1699
1700                 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1701                 if (hmp->fchain.flags & (HAMMER2_CHAIN_MODIFIED |
1702                                          HAMMER2_CHAIN_SUBMODIFIED)) {
1703                         /* this will also modify vchain as a side effect */
1704                         hammer2_chain_flush(&info.trans, &hmp->fchain);
1705                 }
1706                 hammer2_chain_unlock(&hmp->fchain);
1707
1708                 error = 0;
1709
1710                 /*
1711                  * We can't safely flush the volume header until we have
1712                  * flushed any device buffers which have built up.
1713                  *
1714                  * XXX this isn't being incremental
1715                  */
1716                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
1717                 error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
1718                 vn_unlock(hmp->devvp);
1719
1720                 /*
1721                  * The flush code sets CHAIN_VOLUMESYNC to indicate that the
1722                  * volume header needs synchronization via hmp->volsync.
1723                  *
1724                  * XXX synchronize the flag & data with only this flush XXX
1725                  */
1726                 if (error == 0 &&
1727                     (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
1728                         struct buf *bp;
1729
1730                         /*
1731                          * Synchronize the disk before flushing the volume
1732                          * header.
1733                          */
1734                         bp = getpbuf(NULL);
1735                         bp->b_bio1.bio_offset = 0;
1736                         bp->b_bufsize = 0;
1737                         bp->b_bcount = 0;
1738                         bp->b_cmd = BUF_CMD_FLUSH;
1739                         bp->b_bio1.bio_done = biodone_sync;
1740                         bp->b_bio1.bio_flags |= BIO_SYNC;
1741                         vn_strategy(hmp->devvp, &bp->b_bio1);
1742                         biowait(&bp->b_bio1, "h2vol");
1743                         relpbuf(bp, NULL);
1744
1745                         /*
1746                          * Then we can safely flush the version of the
1747                          * volume header synchronized by the flush code.
1748                          */
1749                         i = hmp->volhdrno + 1;
1750                         if (i >= HAMMER2_NUM_VOLHDRS)
1751                                 i = 0;
1752                         if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
1753                             hmp->volsync.volu_size) {
1754                                 i = 0;
1755                         }
1756                         kprintf("sync volhdr %d %jd\n",
1757                                 i, (intmax_t)hmp->volsync.volu_size);
1758                         bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1759                                     HAMMER2_PBUFSIZE, 0, 0);
1760                         atomic_clear_int(&hmp->vchain.flags,
1761                                          HAMMER2_CHAIN_VOLUMESYNC);
1762                         bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
1763                         bawrite(bp);
1764                         hmp->volhdrno = i;
1765                 }
1766                 if (error)
1767                         total_error = error;
1768         }
1769
1770         hammer2_trans_done(&info.trans);
1771         return (total_error);
1772 }
1773
1774 /*
1775  * Sync passes.
1776  *
1777  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
1778  *       won't flush on those flags.  The syncer code above will do a
1779  *       general meta-data flush globally that will catch these flags.
1780  */
1781
1782 static int
1783 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
1784 {
1785         struct hammer2_sync_info *info = data;
1786         hammer2_inode_t *ip;
1787         hammer2_chain_t *parent;
1788         int error;
1789
1790         ip = VTOI(vp);
1791         if (ip == NULL)
1792                 return(0);
1793         if (vp->v_type == VNON || vp->v_type == VBAD) {
1794                 vclrisdirty(vp);
1795                 return(0);
1796         }
1797         if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
1798             RB_EMPTY(&vp->v_rbdirty_tree)) {
1799                 vclrisdirty(vp);
1800                 return(0);
1801         }
1802
1803         /*
1804          * VOP_FSYNC will start a new transaction so replicate some code
1805          * here to do it inline (see hammer2_vop_fsync()).
1806          *
1807          * WARNING: The vfsync interacts with the buffer cache and might
1808          *          block, we can't hold the inode lock at that time.
1809          */
1810         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1811         if (ip->vp)
1812                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
1813         parent = hammer2_inode_lock_ex(ip);
1814         hammer2_chain_flush(&info->trans, parent);
1815         hammer2_inode_unlock_ex(ip, parent);
1816         error = 0;
1817 #if 0
1818         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
1819 #endif
1820         if (error)
1821                 info->error = error;
1822         return(0);
1823 }
1824
1825 static
1826 int
1827 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1828 {
1829         return (0);
1830 }
1831
1832 static
1833 int
1834 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1835                struct fid *fhp, struct vnode **vpp)
1836 {
1837         return (0);
1838 }
1839
1840 static
1841 int
1842 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1843                  int *exflagsp, struct ucred **credanonp)
1844 {
1845         return (0);
1846 }
1847
1848 /*
1849  * Support code for hammer2_mount().  Read, verify, and install the volume
1850  * header into the HMP
1851  *
1852  * XXX read four volhdrs and use the one with the highest TID whos CRC
1853  *     matches.
1854  *
1855  * XXX check iCRCs.
1856  *
1857  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1858  *     nonexistant locations.
1859  *
1860  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1861  */
1862 static
1863 int
1864 hammer2_install_volume_header(hammer2_mount_t *hmp)
1865 {
1866         hammer2_volume_data_t *vd;
1867         struct buf *bp;
1868         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1869         int error_reported;
1870         int error;
1871         int valid;
1872         int i;
1873
1874         error_reported = 0;
1875         error = 0;
1876         valid = 0;
1877         bp = NULL;
1878
1879         /*
1880          * There are up to 4 copies of the volume header (syncs iterate
1881          * between them so there is no single master).  We don't trust the
1882          * volu_size field so we don't know precisely how large the filesystem
1883          * is, so depend on the OS to return an error if we go beyond the
1884          * block device's EOF.
1885          */
1886         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1887                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1888                               HAMMER2_VOLUME_BYTES, &bp);
1889                 if (error) {
1890                         brelse(bp);
1891                         bp = NULL;
1892                         continue;
1893                 }
1894
1895                 vd = (struct hammer2_volume_data *) bp->b_data;
1896                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1897                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1898                         brelse(bp);
1899                         bp = NULL;
1900                         continue;
1901                 }
1902
1903                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1904                         /* XXX: Reversed-endianness filesystem */
1905                         kprintf("hammer2: reverse-endian filesystem detected");
1906                         brelse(bp);
1907                         bp = NULL;
1908                         continue;
1909                 }
1910
1911                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1912                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1913                                       HAMMER2_VOLUME_ICRC0_SIZE);
1914                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1915                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1916                                        HAMMER2_VOLUME_ICRC1_SIZE);
1917                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1918                         kprintf("hammer2 volume header crc "
1919                                 "mismatch copy #%d %08x/%08x\n",
1920                                 i, crc0, crc);
1921                         error_reported = 1;
1922                         brelse(bp);
1923                         bp = NULL;
1924                         continue;
1925                 }
1926                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1927                         valid = 1;
1928                         hmp->voldata = *vd;
1929                         hmp->volhdrno = i;
1930                 }
1931                 brelse(bp);
1932                 bp = NULL;
1933         }
1934         if (valid) {
1935                 hmp->volsync = hmp->voldata;
1936                 error = 0;
1937                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1938                         kprintf("hammer2: using volume header #%d\n",
1939                                 hmp->volhdrno);
1940                 }
1941         } else {
1942                 error = EINVAL;
1943                 kprintf("hammer2: no valid volume headers found!\n");
1944         }
1945         return (error);
1946 }
1947
1948 /*
1949  * Reconnect using the passed file pointer.  The caller must ref the
1950  * fp for us.
1951  */
1952 void
1953 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1954 {
1955         hammer2_inode_data_t *ipdata;
1956         hammer2_chain_t *parent;
1957         hammer2_mount_t *hmp;
1958         size_t name_len;
1959
1960         hmp = pmp->cluster.chains[0]->hmp;      /* XXX */
1961
1962         /*
1963          * Closes old comm descriptor, kills threads, cleans up
1964          * states, then installs the new descriptor and creates
1965          * new threads.
1966          */
1967         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1968
1969         /*
1970          * Setup LNK_CONN fields for autoinitiated state machine
1971          */
1972         parent = hammer2_inode_lock_ex(pmp->iroot);
1973         ipdata = &parent->data->ipdata;
1974         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1975         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1976         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1977         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1978         pmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
1979
1980         /*
1981          * Filter adjustment.  Clients do not need visibility into other
1982          * clients (otherwise millions of clients would present a serious
1983          * problem).  The fs_label also serves to restrict the namespace.
1984          */
1985         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1986         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1987         switch (ipdata->pfs_type) {
1988         case DMSG_PFSTYPE_CLIENT:
1989                 pmp->iocom.auto_lnk_conn.peer_mask &=
1990                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1991                 break;
1992         default:
1993                 break;
1994         }
1995
1996         name_len = ipdata->name_len;
1997         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1998                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1999         bcopy(ipdata->filename,
2000               pmp->iocom.auto_lnk_conn.fs_label,
2001               name_len);
2002         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
2003
2004         /*
2005          * Setup LNK_SPAN fields for autoinitiated state machine
2006          */
2007         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
2008         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
2009         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
2010         pmp->iocom.auto_lnk_span.peer_type = hmp->voldata.peer_type;
2011         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2012         name_len = ipdata->name_len;
2013         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
2014                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
2015         bcopy(ipdata->filename,
2016               pmp->iocom.auto_lnk_span.fs_label,
2017               name_len);
2018         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
2019         hammer2_inode_unlock_ex(pmp->iroot, parent);
2020
2021         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
2022 }
2023
2024 static int
2025 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2026 {
2027         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
2028         case DMSG_DBG_SHELL:
2029                 /*
2030                  * (non-transaction)
2031                  * Execute shell command (not supported atm)
2032                  */
2033                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2034                 break;
2035         case DMSG_DBG_SHELL | DMSGF_REPLY:
2036                 /*
2037                  * (non-transaction)
2038                  */
2039                 if (msg->aux_data) {
2040                         msg->aux_data[msg->aux_size - 1] = 0;
2041                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2042                 }
2043                 break;
2044         default:
2045                 /*
2046                  * Unsupported message received.  We only need to
2047                  * reply if it's a transaction in order to close our end.
2048                  * Ignore any one-way messages are any further messages
2049                  * associated with the transaction.
2050                  *
2051                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2052                  *       which might be one-way, replying to those would
2053                  *       cause an infinite ping-pong.
2054                  */
2055                 if (msg->any.head.cmd & DMSGF_CREATE)
2056                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2057                 break;
2058         }
2059         return(0);
2060 }
2061
2062 /*
2063  * This function is called after KDMSG has automatically handled processing
2064  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2065  *
2066  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2067  * advertises all available hammer2 super-root volumes.
2068  */
2069 static void
2070 hammer2_autodmsg(kdmsg_msg_t *msg)
2071 {
2072         hammer2_pfsmount_t *pmp = msg->iocom->handle;
2073         hammer2_mount_t *hmp = pmp->cluster.chains[0]->hmp; /* XXX */
2074         int copyid;
2075
2076         /*
2077          * We only care about replies to our LNK_CONN auto-request.  kdmsg
2078          * has already processed the reply, we use this calback as a shim
2079          * to know when we can advertise available super-root volumes.
2080          */
2081         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
2082             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
2083             msg->state == NULL) {
2084                 return;
2085         }
2086
2087         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
2088
2089         if (msg->any.head.cmd & DMSGF_CREATE) {
2090                 kprintf("HAMMER2: VOLDATA DUMP\n");
2091
2092                 /*
2093                  * Dump the configuration stored in the volume header
2094                  */
2095                 hammer2_voldata_lock(hmp);
2096                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
2097                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
2098                                 continue;
2099                         hammer2_volconf_update(pmp, copyid);
2100                 }
2101                 hammer2_voldata_unlock(hmp, 0);
2102         }
2103         if ((msg->any.head.cmd & DMSGF_DELETE) &&
2104             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2105                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
2106         }
2107 }
2108
2109 /*
2110  * Volume configuration updates are passed onto the userland service
2111  * daemon via the open LNK_CONN transaction.
2112  */
2113 void
2114 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
2115 {
2116         hammer2_mount_t *hmp = pmp->cluster.chains[0]->hmp;     /* XXX */
2117         kdmsg_msg_t *msg;
2118
2119         /* XXX interlock against connection state termination */
2120         kprintf("volconf update %p\n", pmp->iocom.conn_state);
2121         if (pmp->iocom.conn_state) {
2122                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2123                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
2124                                             DMSG_LNK_VOLCONF, NULL, NULL);
2125                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
2126                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
2127                 msg->any.lnk_volconf.index = index;
2128                 kdmsg_msg_write(msg);
2129         }
2130 }
2131
2132 void
2133 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
2134 {
2135         hammer2_chain_layer_t *layer;
2136         hammer2_chain_t *scan;
2137         hammer2_chain_t *first_parent;
2138
2139         --*countp;
2140         if (*countp == 0) {
2141                 kprintf("%*.*s...\n", tab, tab, "");
2142                 return;
2143         }
2144         if (*countp < 0)
2145                 return;
2146         first_parent = chain->core ? TAILQ_FIRST(&chain->core->ownerq) : NULL;
2147         kprintf("%*.*schain %p.%d [%08x][core=%p fp=%p] (%s) np=%p dt=%s refs=%d",
2148                 tab, tab, "",
2149                 chain, chain->bref.type, chain->flags,
2150                 chain->core,
2151                 first_parent,
2152                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2153                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2154                 (first_parent ? TAILQ_NEXT(chain, core_entry) : NULL),
2155                 (chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
2156                 chain->refs);
2157         if (first_parent)
2158                 kprintf(" [fpflags %08x fprefs %d\n",
2159                         first_parent->flags,
2160                         first_parent->refs);
2161         if (chain->core == NULL || TAILQ_EMPTY(&chain->core->layerq))
2162                 kprintf("\n");
2163         else
2164                 kprintf(" {\n");
2165         TAILQ_FOREACH(layer, &chain->core->layerq, entry) {
2166                 RB_FOREACH(scan, hammer2_chain_tree, &layer->rbtree) {
2167                         hammer2_dump_chain(scan, tab + 4, countp);
2168                 }
2169         }
2170         if (chain->core && !TAILQ_EMPTY(&chain->core->layerq)) {
2171                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2172                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2173                                 chain->data->ipdata.filename);
2174                 else
2175                         kprintf("%*.*s}\n", tab, tab, "");
2176         }
2177 }