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(struct mount *, 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_scan1(struct mount *mp, struct vnode *vp, void *data);
 193 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 194
 195 static void hammer2_write_thread(void *arg);
 196
 197 /*
 198  * Functions for compression in threads,
 199  * from hammer2_vnops.c
 200  */
 201 static void hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 202                                 hammer2_inode_t *ip,
 203                                 hammer2_inode_data_t *ipdata,
 204                                 hammer2_chain_t **parentp,
 205                                 hammer2_key_t lbase, int ioflag, int pblksize,
 206                                 int *errorp);
 207 static void hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 208                                 hammer2_inode_t *ip,
 209                                 hammer2_inode_data_t *ipdata,
 210                                 hammer2_chain_t **parentp,
 211                                 hammer2_key_t lbase, int ioflag,
 212                                 int pblksize, int *errorp, int comp_algo);
 213 static void hammer2_zero_check_and_write(struct buf *bp,
 214                                 hammer2_trans_t *trans, hammer2_inode_t *ip,
 215                                 hammer2_inode_data_t *ipdata,
 216                                 hammer2_chain_t **parentp,
 217                                 hammer2_key_t lbase,
 218                                 int ioflag, int pblksize, int *errorp);
 219 static int test_block_zeros(const char *buf, size_t bytes);
 220 static void zero_write(struct buf *bp, hammer2_trans_t *trans,
 221                                 hammer2_inode_t *ip,
 222                                 hammer2_inode_data_t *ipdata,
 223                                 hammer2_chain_t **parentp,
 224                                 hammer2_key_t lbase,
 225                                 int *errorp);
 226 static void hammer2_write_bp(hammer2_chain_t *chain, struct buf *bp,
 227                                 int ioflag, int pblksize, int *errorp);
 228
 229 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
 230 static void hammer2_autodmsg(kdmsg_msg_t *msg);
 231
 232
 233 /*
 234  * HAMMER2 vfs operations.
 235  */
 236 static struct vfsops hammer2_vfsops = {
 237         .vfs_init       = hammer2_vfs_init,
 238         .vfs_uninit = hammer2_vfs_uninit,
 239         .vfs_sync       = hammer2_vfs_sync,
 240         .vfs_mount      = hammer2_vfs_mount,
 241         .vfs_unmount    = hammer2_vfs_unmount,
 242         .vfs_root       = hammer2_vfs_root,
 243         .vfs_statfs     = hammer2_vfs_statfs,
 244         .vfs_statvfs    = hammer2_vfs_statvfs,
 245         .vfs_vget       = hammer2_vfs_vget,
 246         .vfs_vptofh     = hammer2_vfs_vptofh,
 247         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 248         .vfs_checkexp   = hammer2_vfs_checkexp
 249 };
 250
 251 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 252
 253 VFS_SET(hammer2_vfsops, hammer2, 0);
 254 MODULE_VERSION(hammer2, 1);
 255
 256 static
 257 int
 258 hammer2_vfs_init(struct vfsconf *conf)
 259 {
 260         static struct objcache_malloc_args margs_read;
 261         static struct objcache_malloc_args margs_write;
 262
 263         int error;
 264
 265         error = 0;
 266
 267         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 268                 error = EINVAL;
 269         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 270                 error = EINVAL;
 271         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 272                 error = EINVAL;
 273
 274         if (error)
 275                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 276
 277         margs_read.objsize = 65536;
 278         margs_read.mtype = D_BUFFER;
 279
 280         margs_write.objsize = 32768;
 281         margs_write.mtype = C_BUFFER;
 282
 283         cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
 284                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 285                                 objcache_malloc_free, &margs_read);
 286         cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
 287                                 0, 1, NULL, NULL, NULL, objcache_malloc_alloc,
 288                                 objcache_malloc_free, &margs_write);
 289
 290         lockinit(&hammer2_mntlk, "mntlk", 0, 0);
 291         TAILQ_INIT(&hammer2_mntlist);
 292
 293         return (error);
 294 }
 295
 296 static
 297 int
 298 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
 299 {
 300         objcache_destroy(cache_buffer_read);
 301         objcache_destroy(cache_buffer_write);
 302         return 0;
 303 }
 304
 305 /*
 306  * Mount or remount HAMMER2 fileystem from physical media
 307  *
 308  *      mountroot
 309  *              mp              mount point structure
 310  *              path            NULL
 311  *              data            <unused>
 312  *              cred            <unused>
 313  *
 314  *      mount
 315  *              mp              mount point structure
 316  *              path            path to mount point
 317  *              data            pointer to argument structure in user space
 318  *                      volume  volume path (device@LABEL form)
 319  *                      hflags  user mount flags
 320  *              cred            user credentials
 321  *
 322  * RETURNS:     0       Success
 323  *              !0      error number
 324  */
 325 static
 326 int
 327 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 328                   struct ucred *cred)
 329 {
 330         struct hammer2_mount_info info;
 331         hammer2_pfsmount_t *pmp;
 332         hammer2_mount_t *hmp;
 333         hammer2_key_t key_next;
 334         hammer2_key_t key_dummy;
 335         hammer2_key_t lhc;
 336         struct vnode *devvp;
 337         struct nlookupdata nd;
 338         hammer2_chain_t *parent;
 339         hammer2_chain_t *schain;
 340         hammer2_chain_t *rchain;
 341         struct file *fp;
 342         char devstr[MNAMELEN];
 343         size_t size;
 344         size_t done;
 345         char *dev;
 346         char *label;
 347         int ronly = 1;
 348         int error;
 349         int cache_index;
 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                         hmp = MPTOHMP(mp);
 395                         devvp = hmp->devvp;
 396                         error = hammer2_remount(mp, path, devvp, cred);
 397                         return error;
 398                 }
 399         }
 400
 401         /*
 402          * PFS mount
 403          *
 404          * Lookup name and verify it refers to a block device.
 405          */
 406         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 407         if (error == 0)
 408                 error = nlookup(&nd);
 409         if (error == 0)
 410                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 411         nlookup_done(&nd);
 412
 413         if (error == 0) {
 414                 if (vn_isdisk(devvp, &error))
 415                         error = vfs_mountedon(devvp);
 416         }
 417
 418         /*
 419          * Determine if the device has already been mounted.  After this
 420          * check hmp will be non-NULL if we are doing the second or more
 421          * hammer2 mounts from the same device.
 422          */
 423         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
 424         TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
 425                 if (hmp->devvp == devvp)
 426                         break;
 427         }
 428
 429         /*
 430          * Open the device if this isn't a secondary mount and construct
 431          * the H2 device mount (hmp).
 432          */
 433         if (hmp == NULL) {
 434                 if (error == 0 && vcount(devvp) > 0)
 435                         error = EBUSY;
 436
 437                 /*
 438                  * Now open the device
 439                  */
 440                 if (error == 0) {
 441                         ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 442                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 443                         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 444                         if (error == 0) {
 445                                 error = VOP_OPEN(devvp,
 446                                                  ronly ? FREAD : FREAD | FWRITE,
 447                                                  FSCRED, NULL);
 448                         }
 449                         vn_unlock(devvp);
 450                 }
 451                 if (error && devvp) {
 452                         vrele(devvp);
 453                         devvp = NULL;
 454                 }
 455                 if (error) {
 456                         lockmgr(&hammer2_mntlk, LK_RELEASE);
 457                         return error;
 458                 }
 459                 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 460                 hmp->ronly = ronly;
 461                 hmp->devvp = devvp;
 462                 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 463                 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
 464
 465                 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 466                 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 467                 TAILQ_INIT(&hmp->transq);
 468
 469                 /*
 470                  * vchain setup. vchain.data is embedded.
 471                  * vchain.refs is initialized and will never drop to 0.
 472                  */
 473                 hmp->vchain.hmp = hmp;
 474                 hmp->vchain.refs = 1;
 475                 hmp->vchain.data = (void *)&hmp->voldata;
 476                 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 477                 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 478                 hmp->vchain.delete_tid = HAMMER2_MAX_TID;
 479                 hammer2_chain_core_alloc(NULL, &hmp->vchain, NULL);
 480                 /* hmp->vchain.u.xxx is left NULL */
 481
 482                 /*
 483                  * fchain setup.  fchain.data is embedded.
 484                  * fchain.refs is initialized and will never drop to 0.
 485                  *
 486                  * The data is not used but needs to be initialized to
 487                  * pass assertion muster.  We use this chain primarily
 488                  * as a placeholder for the freemap's top-level RBTREE
 489                  * so it does not interfere with the volume's topology
 490                  * RBTREE.
 491                  */
 492                 hmp->fchain.hmp = hmp;
 493                 hmp->fchain.refs = 1;
 494                 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
 495                 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
 496                 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 497                 hmp->fchain.bref.methods =
 498                         HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
 499                         HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
 500                 hmp->fchain.delete_tid = HAMMER2_MAX_TID;
 501
 502                 hammer2_chain_core_alloc(NULL, &hmp->fchain, NULL);
 503                 /* hmp->fchain.u.xxx is left NULL */
 504
 505                 /*
 506                  * Install the volume header
 507                  */
 508                 error = hammer2_install_volume_header(hmp);
 509                 if (error) {
 510                         hammer2_vfs_unmount(mp, MNT_FORCE);
 511                         return error;
 512                 }
 513
 514                 /*
 515                  * First locate the super-root inode, which is key 0
 516                  * relative to the volume header's blockset.
 517                  *
 518                  * Then locate the root inode by scanning the directory keyspace
 519                  * represented by the label.
 520                  */
 521                 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
 522                 schain = hammer2_chain_lookup(&parent, &key_dummy,
 523                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
 524                                       &cache_index, 0);
 525                 hammer2_chain_lookup_done(parent);
 526                 if (schain == NULL) {
 527                         kprintf("hammer2_mount: invalid super-root\n");
 528                         hammer2_vfs_unmount(mp, MNT_FORCE);
 529                         return EINVAL;
 530                 }
 531                 hammer2_chain_ref(schain);      /* for hmp->schain */
 532                 hmp->schain = schain;           /* left locked for inode_get */
 533                 hmp->sroot = hammer2_inode_get(NULL, NULL, schain);
 534                 hammer2_inode_ref(hmp->sroot);  /* for hmp->sroot */
 535                 hammer2_inode_unlock_ex(hmp->sroot, schain);
 536                 schain = NULL;
 537
 538                 mtx_init(&hmp->wthread_mtx);
 539                 bioq_init(&hmp->wthread_bioq);
 540                 hmp->wthread_destroy = 0;
 541
 542                 /*
 543                  * Launch threads.
 544                  */
 545                 lwkt_create(hammer2_write_thread, hmp,
 546                                 NULL, NULL, 0, -1, "hammer2-write");
 547         }
 548
 549         /*
 550          * Block device opened successfully, finish initializing the
 551          * mount structure.
 552          *
 553          * From this point on we have to call hammer2_unmount() on failure.
 554          */
 555         pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
 556         pmp->mount_cluster = kmalloc(sizeof(hammer2_cluster_t), M_HAMMER2,
 557                                      M_WAITOK | M_ZERO);
 558         pmp->cluster = pmp->mount_cluster;
 559
 560         kmalloc_create(&pmp->minode, "HAMMER2-inodes");
 561         kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
 562
 563         pmp->mount_cluster->hmp = hmp;
 564         spin_init(&pmp->inum_spin);
 565         RB_INIT(&pmp->inum_tree);
 566
 567         kdmsg_iocom_init(&pmp->iocom, pmp,
 568                          KDMSG_IOCOMF_AUTOCONN |
 569                          KDMSG_IOCOMF_AUTOSPAN |
 570                          KDMSG_IOCOMF_AUTOCIRC,
 571                          pmp->mmsg, hammer2_rcvdmsg);
 572
 573         ccms_domain_init(&pmp->ccms_dom);
 574         ++hmp->pmp_count;
 575         lockmgr(&hammer2_mntlk, LK_RELEASE);
 576         kprintf("hammer2_mount hmp=%p pmp=%p pmpcnt=%d\n",
 577                 hmp, pmp, hmp->pmp_count);
 578
 579         mp->mnt_flag = MNT_LOCAL;
 580         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 581
 582         /*
 583          * required mount structure initializations
 584          */
 585         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 586         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 587
 588         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 589         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 590
 591         /*
 592          * Optional fields
 593          */
 594         mp->mnt_iosize_max = MAXPHYS;
 595         mp->mnt_data = (qaddr_t)pmp;
 596         pmp->mp = mp;
 597
 598         /*
 599          * schain only has 1 ref now for its hmp->schain assignment.
 600          * Setup for lookup (which will lock it).
 601          */
 602         parent = hammer2_chain_lookup_init(hmp->schain, 0);
 603         lhc = hammer2_dirhash(label, strlen(label));
 604         rchain = hammer2_chain_lookup(&parent, &key_next,
 605                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 606                                       &cache_index, 0);
 607         while (rchain) {
 608                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 609                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 610                         break;
 611                 }
 612                 rchain = hammer2_chain_next(&parent, rchain, &key_next,
 613                                             key_next,
 614                                             lhc + HAMMER2_DIRHASH_LOMASK,
 615                                             &cache_index, 0);
 616         }
 617         hammer2_chain_lookup_done(parent);
 618         if (rchain == NULL) {
 619                 kprintf("hammer2_mount: PFS label not found\n");
 620                 hammer2_vfs_unmount(mp, MNT_FORCE);
 621                 return EINVAL;
 622         }
 623         if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
 624                 hammer2_chain_unlock(rchain);
 625                 kprintf("hammer2_mount: PFS label already mounted!\n");
 626                 hammer2_vfs_unmount(mp, MNT_FORCE);
 627                 return EBUSY;
 628         }
 629         if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
 630                 kprintf("hammer2_mount: PFS label currently recycling\n");
 631                 hammer2_vfs_unmount(mp, MNT_FORCE);
 632                 return EBUSY;
 633         }
 634
 635         atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
 636
 637         /*
 638          * NOTE: *_get() integrates chain's lock into the inode lock.
 639          */
 640         hammer2_chain_ref(rchain);              /* for pmp->rchain */
 641         pmp->mount_cluster->rchain = rchain;    /* left held & unlocked */
 642         pmp->iroot = hammer2_inode_get(pmp, NULL, rchain);
 643         hammer2_inode_ref(pmp->iroot);          /* ref for pmp->iroot */
 644
 645         KKASSERT(rchain->pmp == NULL);          /* tracking pmp for rchain */
 646         rchain->pmp = pmp;
 647         atomic_add_long(&pmp->inmem_chains, 1);
 648
 649         hammer2_inode_unlock_ex(pmp->iroot, rchain);
 650
 651         kprintf("iroot %p\n", pmp->iroot);
 652
 653         /*
 654          * Ref the cluster management messaging descriptor.  The mount
 655          * program deals with the other end of the communications pipe.
 656          */
 657         fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
 658         if (fp == NULL) {
 659                 kprintf("hammer2_mount: bad cluster_fd!\n");
 660                 hammer2_vfs_unmount(mp, MNT_FORCE);
 661                 return EBADF;
 662         }
 663         hammer2_cluster_reconnect(pmp, fp);
 664
 665         /*
 666          * Finish setup
 667          */
 668         vfs_getnewfsid(mp);
 669         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 670         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 671         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 672
 673         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 674         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 675         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 676         copyinstr(path, mp->mnt_stat.f_mntonname,
 677                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 678                   &size);
 679
 680         /*
 681          * Initial statfs to prime mnt_stat.
 682          */
 683         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 684
 685         return 0;
 686 }
 687
 688 /*
 689  * Handle bioq for strategy write
 690  */
 691 static
 692 void
 693 hammer2_write_thread(void *arg)
 694 {
 695         hammer2_mount_t* hmp;
 696         struct bio *bio;
 697         struct buf *bp;
 698         hammer2_trans_t trans;
 699         struct vnode *vp;
 700         hammer2_inode_t *last_ip;
 701         hammer2_inode_t *ip;
 702         hammer2_chain_t *parent;
 703         hammer2_chain_t **parentp;
 704         hammer2_inode_data_t *ipdata;
 705         hammer2_key_t lbase;
 706         int lblksize;
 707         int pblksize;
 708         int error;
 709
 710         hmp = arg;
 711
 712         mtx_lock(&hmp->wthread_mtx);
 713         while (hmp->wthread_destroy == 0) {
 714                 if (bioq_first(&hmp->wthread_bioq) == NULL) {
 715                         mtxsleep(&hmp->wthread_bioq, &hmp->wthread_mtx,
 716                                  0, "h2bioqw", 0);
 717                 }
 718                 last_ip = NULL;
 719                 parent = NULL;
 720                 parentp = &parent;
 721
 722                 while ((bio = bioq_takefirst(&hmp->wthread_bioq)) != NULL) {
 723                         mtx_unlock(&hmp->wthread_mtx);
 724
 725                         error = 0;
 726                         bp = bio->bio_buf;
 727                         vp = bp->b_vp;
 728                         ip = VTOI(vp);
 729
 730                         /*
 731                          * Cache transaction for multi-buffer flush efficiency.
 732                          * Lock the ip separately for each buffer to allow
 733                          * interleaving with frontend writes.
 734                          */
 735                         if (last_ip != ip) {
 736                                 if (last_ip)
 737                                         hammer2_trans_done(&trans);
 738                                 hammer2_trans_init(&trans, ip->pmp,
 739                                                    HAMMER2_TRANS_BUFCACHE);
 740                                 last_ip = ip;
 741                         }
 742                         parent = hammer2_inode_lock_ex(ip);
 743
 744                         /*
 745                          * Inode is modified, flush size and mtime changes
 746                          * to ensure that the file size remains consistent
 747                          * with the buffers being flushed.
 748                          */
 749                         if (ip->flags & (HAMMER2_INODE_RESIZED |
 750                                          HAMMER2_INODE_MTIME)) {
 751                                 hammer2_inode_fsync(&trans, ip, parentp);
 752                         }
 753                         ipdata = hammer2_chain_modify_ip(&trans, ip,
 754                                                          parentp, 0);
 755                         lblksize = hammer2_calc_logical(ip, bio->bio_offset,
 756                                                         &lbase, NULL);
 757                         pblksize = hammer2_calc_physical(ip, lbase);
 758                         hammer2_write_file_core(bp, &trans, ip, ipdata,
 759                                                 parentp,
 760                                                 lbase, IO_ASYNC,
 761                                                 pblksize, &error);
 762                         hammer2_inode_unlock_ex(ip, parent);
 763                         if (error) {
 764                                 kprintf("hammer2: error in buffer write\n");
 765                                 bp->b_flags |= B_ERROR;
 766                                 bp->b_error = EIO;
 767                         }
 768                         biodone(bio);
 769                         mtx_lock(&hmp->wthread_mtx);
 770                 }
 771
 772                 /*
 773                  * Clean out transaction cache
 774                  */
 775                 if (last_ip)
 776                         hammer2_trans_done(&trans);
 777         }
 778         hmp->wthread_destroy = -1;
 779         wakeup(&hmp->wthread_destroy);
 780
 781         mtx_unlock(&hmp->wthread_mtx);
 782 }
 783
 784 /*
 785  * Return a chain suitable for I/O, creating the chain if necessary
 786  * and assigning its physical block.
 787  */
 788 static
 789 hammer2_chain_t *
 790 hammer2_assign_physical(hammer2_trans_t *trans,
 791                         hammer2_inode_t *ip, hammer2_chain_t **parentp,
 792                         hammer2_key_t lbase, int pblksize, int *errorp)
 793 {
 794         hammer2_chain_t *parent;
 795         hammer2_chain_t *chain;
 796         hammer2_off_t pbase;
 797         hammer2_key_t key_dummy;
 798         int pradix = hammer2_getradix(pblksize);
 799         int cache_index = -1;
 800
 801         /*
 802          * Locate the chain associated with lbase, return a locked chain.
 803          * However, do not instantiate any data reference (which utilizes a
 804          * device buffer) because we will be using direct IO via the
 805          * logical buffer cache buffer.
 806          */
 807         *errorp = 0;
 808         KKASSERT(pblksize >= HAMMER2_MIN_ALLOC);
 809 retry:
 810         parent = *parentp;
 811         hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); /* extra lock */
 812         chain = hammer2_chain_lookup(&parent, &key_dummy,
 813                                      lbase, lbase,
 814                                      &cache_index, HAMMER2_LOOKUP_NODATA);
 815
 816         if (chain == NULL) {
 817                 /*
 818                  * We found a hole, create a new chain entry.
 819                  *
 820                  * NOTE: DATA chains are created without device backing
 821                  *       store (nor do we want any).
 822                  */
 823                 *errorp = hammer2_chain_create(trans, &parent, &chain,
 824                                                lbase, HAMMER2_PBUFRADIX,
 825                                                HAMMER2_BREF_TYPE_DATA,
 826                                                pblksize);
 827                 if (chain == NULL) {
 828                         hammer2_chain_lookup_done(parent);
 829                         panic("hammer2_chain_create: par=%p error=%d\n",
 830                                 parent, *errorp);
 831                         goto retry;
 832                 }
 833
 834                 pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX;
 835                 /*ip->delta_dcount += pblksize;*/
 836         } else {
 837                 switch (chain->bref.type) {
 838                 case HAMMER2_BREF_TYPE_INODE:
 839                         /*
 840                          * The data is embedded in the inode.  The
 841                          * caller is responsible for marking the inode
 842                          * modified and copying the data to the embedded
 843                          * area.
 844                          */
 845                         pbase = NOOFFSET;
 846                         break;
 847                 case HAMMER2_BREF_TYPE_DATA:
 848                         if (chain->bytes != pblksize) {
 849                                 hammer2_chain_resize(trans, ip,
 850                                                      parent, &chain,
 851                                                      pradix,
 852                                                      HAMMER2_MODIFY_OPTDATA);
 853                         }
 854                         hammer2_chain_modify(trans, &chain,
 855                                              HAMMER2_MODIFY_OPTDATA);
 856                         pbase = chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX;
 857                         break;
 858                 default:
 859                         panic("hammer2_assign_physical: bad type");
 860                         /* NOT REACHED */
 861                         pbase = NOOFFSET;
 862                         break;
 863                 }
 864         }
 865
 866         /*
 867          * Cleanup.  If chain wound up being the inode (i.e. DIRECTDATA),
 868          * we might have to replace *parentp.
 869          */
 870         hammer2_chain_lookup_done(parent);
 871         if (chain) {
 872                 if (*parentp != chain &&
 873                     (*parentp)->core == chain->core) {
 874                         parent = *parentp;
 875                         *parentp = chain;               /* eats lock */
 876                         hammer2_chain_unlock(parent);
 877                         hammer2_chain_lock(chain, 0);   /* need another */
 878                 }
 879                 /* else chain already locked for return */
 880         }
 881         return (chain);
 882 }
 883
 884 /*
 885  * From hammer2_vnops.c.
 886  * The core write function which determines which path to take
 887  * depending on compression settings.
 888  */
 889 static
 890 void
 891 hammer2_write_file_core(struct buf *bp, hammer2_trans_t *trans,
 892                         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
 893                         hammer2_chain_t **parentp,
 894                         hammer2_key_t lbase, int ioflag, int pblksize,
 895                         int *errorp)
 896 {
 897         hammer2_chain_t *chain;
 898
 899         switch(HAMMER2_DEC_COMP(ipdata->comp_algo)) {
 900         case HAMMER2_COMP_NONE:
 901                 /*
 902                  * We have to assign physical storage to the buffer
 903                  * we intend to dirty or write now to avoid deadlocks
 904                  * in the strategy code later.
 905                  *
 906                  * This can return NOOFFSET for inode-embedded data.
 907                  * The strategy code will take care of it in that case.
 908                  */
 909                 chain = hammer2_assign_physical(trans, ip, parentp,
 910                                                 lbase, pblksize,
 911                                                 errorp);
 912                 hammer2_write_bp(chain, bp, ioflag, pblksize, errorp);
 913                 if (chain)
 914                         hammer2_chain_unlock(chain);
 915                 break;
 916         case HAMMER2_COMP_AUTOZERO:
 917                 /*
 918                  * Check for zero-fill only
 919                  */
 920                 hammer2_zero_check_and_write(bp, trans, ip,
 921                                     ipdata, parentp, lbase,
 922                                     ioflag, pblksize, errorp);
 923                 break;
 924         case HAMMER2_COMP_LZ4:
 925         case HAMMER2_COMP_ZLIB:
 926         default:
 927                 /*
 928                  * Check for zero-fill and attempt compression.
 929                  */
 930                 hammer2_compress_and_write(bp, trans, ip,
 931                                            ipdata, parentp,
 932                                            lbase, ioflag,
 933                                            pblksize, errorp,
 934                                            ipdata->comp_algo);
 935                 break;
 936         }
 937         ipdata = &ip->chain->data->ipdata;      /* reload */
 938 }
 939
 940 /*
 941  * From hammer2_vnops.c
 942  * Generic function that will perform the compression in compression
 943  * write path. The compression algorithm is determined by the settings
 944  * obtained from inode.
 945  */
 946 static
 947 void
 948 hammer2_compress_and_write(struct buf *bp, hammer2_trans_t *trans,
 949         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
 950         hammer2_chain_t **parentp,
 951         hammer2_key_t lbase, int ioflag, int pblksize,
 952         int *errorp, int comp_algo)
 953 {
 954         hammer2_chain_t *chain;
 955         int comp_size;
 956         int comp_block_size;
 957         char *comp_buffer;
 958
 959         if (test_block_zeros(bp->b_data, pblksize)) {
 960                 zero_write(bp, trans, ip, ipdata, parentp, lbase, errorp);
 961                 return;
 962         }
 963
 964         comp_size = 0;
 965         comp_buffer = NULL;
 966
 967         KKASSERT(pblksize / 2 <= 32768);
 968
 969         if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0) {
 970                 z_stream strm_compress;
 971                 int comp_level;
 972                 int ret;
 973
 974                 switch(HAMMER2_DEC_COMP(comp_algo)) {
 975                 case HAMMER2_COMP_LZ4:
 976                         comp_buffer = objcache_get(cache_buffer_write,
 977                                                    M_INTWAIT);
 978                         comp_size = LZ4_compress_limitedOutput(
 979                                         bp->b_data,
 980                                         &comp_buffer[sizeof(int)],
 981                                         pblksize,
 982                                         pblksize / 2 - sizeof(int));
 983                         /*
 984                          * We need to prefix with the size, LZ4
 985                          * doesn't do it for us.  Add the related
 986                          * overhead.
 987                          */
 988                         *(int *)comp_buffer = comp_size;
 989                         if (comp_size)
 990                                 comp_size += sizeof(int);
 991                         break;
 992                 case HAMMER2_COMP_ZLIB:
 993                         comp_level = HAMMER2_DEC_LEVEL(comp_algo);
 994                         if (comp_level == 0)
 995                                 comp_level = 6; /* default zlib compression */
 996                         else if (comp_level < 6)
 997                                 comp_level = 6;
 998                         else if (comp_level > 9)
 999                                 comp_level = 9;
1000                         ret = deflateInit(&strm_compress, comp_level);
1001                         if (ret != Z_OK) {
1002                                 kprintf("HAMMER2 ZLIB: fatal error "
1003                                         "on deflateInit.\n");
1004                         }
1005
1006                         comp_buffer = objcache_get(cache_buffer_write,
1007                                                    M_INTWAIT);
1008                         strm_compress.next_in = bp->b_data;
1009                         strm_compress.avail_in = pblksize;
1010                         strm_compress.next_out = comp_buffer;
1011                         strm_compress.avail_out = pblksize / 2;
1012                         ret = deflate(&strm_compress, Z_FINISH);
1013                         if (ret == Z_STREAM_END) {
1014                                 comp_size = pblksize / 2 -
1015                                             strm_compress.avail_out;
1016                         } else {
1017                                 comp_size = 0;
1018                         }
1019                         ret = deflateEnd(&strm_compress);
1020                         break;
1021                 default:
1022                         kprintf("Error: Unknown compression method.\n");
1023                         kprintf("Comp_method = %d.\n", comp_algo);
1024                         break;
1025                 }
1026         }
1027
1028         if (comp_size == 0) {
1029                 /*
1030                  * compression failed or turned off
1031                  */
1032                 comp_block_size = pblksize;     /* safety */
1033                 if (++ip->comp_heuristic > 128)
1034                         ip->comp_heuristic = 8;
1035         } else {
1036                 /*
1037                  * compression succeeded
1038                  */
1039                 ip->comp_heuristic = 0;
1040                 if (comp_size <= 1024) {
1041                         comp_block_size = 1024;
1042                 } else if (comp_size <= 2048) {
1043                         comp_block_size = 2048;
1044                 } else if (comp_size <= 4096) {
1045                         comp_block_size = 4096;
1046                 } else if (comp_size <= 8192) {
1047                         comp_block_size = 8192;
1048                 } else if (comp_size <= 16384) {
1049                         comp_block_size = 16384;
1050                 } else if (comp_size <= 32768) {
1051                         comp_block_size = 32768;
1052                 } else {
1053                         panic("hammer2: WRITE PATH: "
1054                               "Weird comp_size value.");
1055                         /* NOT REACHED */
1056                         comp_block_size = pblksize;
1057                 }
1058         }
1059
1060         chain = hammer2_assign_physical(trans, ip, parentp,
1061                                         lbase, comp_block_size,
1062                                         errorp);
1063         ipdata = &ip->chain->data->ipdata;      /* RELOAD */
1064
1065         if (*errorp) {
1066                 kprintf("WRITE PATH: An error occurred while "
1067                         "assigning physical space.\n");
1068                 KKASSERT(chain == NULL);
1069         } else {
1070                 /* Get device offset */
1071                 hammer2_off_t pbase;
1072                 hammer2_off_t pmask;
1073                 hammer2_off_t peof;
1074                 size_t boff;
1075                 size_t psize;
1076                 struct buf *dbp;
1077                 int temp_check;
1078
1079                 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1080
1081                 switch(chain->bref.type) {
1082                 case HAMMER2_BREF_TYPE_INODE:
1083                         KKASSERT(chain->data->ipdata.op_flags &
1084                                  HAMMER2_OPFLAG_DIRECTDATA);
1085                         KKASSERT(bp->b_loffset == 0);
1086                         bcopy(bp->b_data, chain->data->ipdata.u.data,
1087                               HAMMER2_EMBEDDED_BYTES);
1088                         break;
1089                 case HAMMER2_BREF_TYPE_DATA:
1090                         psize = hammer2_devblksize(chain->bytes);
1091                         pmask = (hammer2_off_t)psize - 1;
1092                         pbase = chain->bref.data_off & ~pmask;
1093                         boff = chain->bref.data_off &
1094                                (HAMMER2_OFF_MASK & pmask);
1095                         peof = (pbase + HAMMER2_SEGMASK64) &
1096                                ~HAMMER2_SEGMASK64;
1097                         temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1098
1099                         /*
1100                          * Optimize out the read-before-write
1101                          * if possible.
1102                          */
1103                         if (comp_block_size == psize) {
1104                                 dbp = getblk(chain->hmp->devvp, pbase,
1105                                              psize, 0, 0);
1106                         } else {
1107                                 *errorp = bread(chain->hmp->devvp,
1108                                                 pbase, psize, &dbp);
1109                                 if (*errorp) {
1110                                         kprintf("hammer2: WRITE PATH: "
1111                                                 "dbp bread error\n");
1112                                         break;
1113                                 }
1114                         }
1115
1116                         /*
1117                          * When loading the block make sure we don't
1118                          * leave garbage after the compressed data.
1119                          */
1120                         if (comp_size) {
1121                                 chain->bref.methods =
1122                                         HAMMER2_ENC_COMP(comp_algo) +
1123                                         HAMMER2_ENC_CHECK(temp_check);
1124                                 bcopy(comp_buffer, dbp->b_data + boff,
1125                                       comp_size);
1126                                 if (comp_size != comp_block_size) {
1127                                         bzero(dbp->b_data + boff +
1128                                                 comp_size,
1129                                               comp_block_size -
1130                                                 comp_size);
1131                                 }
1132                         } else {
1133                                 chain->bref.methods =
1134                                         HAMMER2_ENC_COMP(
1135                                                 HAMMER2_COMP_NONE) +
1136                                         HAMMER2_ENC_CHECK(temp_check);
1137                                 bcopy(bp->b_data, dbp->b_data + boff,
1138                                       pblksize);
1139                         }
1140
1141                         /*
1142                          * Device buffer is now valid, chain is no
1143                          * longer in the initial state.
1144                          */
1145                         atomic_clear_int(&chain->flags,
1146                                          HAMMER2_CHAIN_INITIAL);
1147
1148                         /* Now write the related bdp. */
1149                         if (ioflag & IO_SYNC) {
1150                                 /*
1151                                  * Synchronous I/O requested.
1152                                  */
1153                                 bwrite(dbp);
1154                         /*
1155                         } else if ((ioflag & IO_DIRECT) &&
1156                                    loff + n == pblksize) {
1157                                 bdwrite(dbp);
1158                         */
1159                         } else if (ioflag & IO_ASYNC) {
1160                                 bawrite(dbp);
1161                         } else if (hammer2_cluster_enable) {
1162                                 cluster_write(dbp, peof,
1163                                               HAMMER2_PBUFSIZE,
1164                                               4/*XXX*/);
1165                         } else {
1166                                 bdwrite(dbp);
1167                         }
1168                         break;
1169                 default:
1170                         panic("hammer2_write_bp: bad chain type %d\n",
1171                                 chain->bref.type);
1172                         /* NOT REACHED */
1173                         break;
1174                 }
1175
1176                 hammer2_chain_unlock(chain);
1177         }
1178         if (comp_buffer)
1179                 objcache_put(cache_buffer_write, comp_buffer);
1180 }
1181
1182 /*
1183  * Function that performs zero-checking and writing without compression,
1184  * it corresponds to default zero-checking path.
1185  */
1186 static
1187 void
1188 hammer2_zero_check_and_write(struct buf *bp, hammer2_trans_t *trans,
1189         hammer2_inode_t *ip, hammer2_inode_data_t *ipdata,
1190         hammer2_chain_t **parentp,
1191         hammer2_key_t lbase, int ioflag, int pblksize, int *errorp)
1192 {
1193         hammer2_chain_t *chain;
1194
1195         if (test_block_zeros(bp->b_data, pblksize)) {
1196                 zero_write(bp, trans, ip, ipdata, parentp, lbase, errorp);
1197         } else {
1198                 chain = hammer2_assign_physical(trans, ip, parentp,
1199                                                 lbase, pblksize, errorp);
1200                 hammer2_write_bp(chain, bp, ioflag, pblksize, errorp);
1201                 if (chain)
1202                         hammer2_chain_unlock(chain);
1203         }
1204 }
1205
1206 /*
1207  * A function to test whether a block of data contains only zeros,
1208  * returns TRUE (non-zero) if the block is all zeros.
1209  */
1210 static
1211 int
1212 test_block_zeros(const char *buf, size_t bytes)
1213 {
1214         size_t i;
1215
1216         for (i = 0; i < bytes; i += sizeof(long)) {
1217                 if (*(const long *)(buf + i) != 0)
1218                         return (0);
1219         }
1220         return (1);
1221 }
1222
1223 /*
1224  * Function to "write" a block that contains only zeros.
1225  */
1226 static
1227 void
1228 zero_write(struct buf *bp, hammer2_trans_t *trans, hammer2_inode_t *ip,
1229         hammer2_inode_data_t *ipdata, hammer2_chain_t **parentp,
1230         hammer2_key_t lbase, int *errorp __unused)
1231 {
1232         hammer2_chain_t *parent;
1233         hammer2_chain_t *chain;
1234         hammer2_key_t key_dummy;
1235         int cache_index = -1;
1236
1237         parent = hammer2_chain_lookup_init(*parentp, 0);
1238
1239         chain = hammer2_chain_lookup(&parent, &key_dummy, lbase, lbase,
1240                                      &cache_index, HAMMER2_LOOKUP_NODATA);
1241         if (chain) {
1242                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) {
1243                         bzero(chain->data->ipdata.u.data,
1244                               HAMMER2_EMBEDDED_BYTES);
1245                 } else {
1246                         hammer2_chain_delete(trans, chain, 0);
1247                 }
1248                 hammer2_chain_unlock(chain);
1249         }
1250         hammer2_chain_lookup_done(parent);
1251 }
1252
1253 /*
1254  * Function to write the data as it is, without performing any sort of
1255  * compression. This function is used in path without compression and
1256  * default zero-checking path.
1257  */
1258 static
1259 void
1260 hammer2_write_bp(hammer2_chain_t *chain, struct buf *bp, int ioflag,
1261                                 int pblksize, int *errorp)
1262 {
1263         hammer2_off_t pbase;
1264         hammer2_off_t pmask;
1265         hammer2_off_t peof;
1266         struct buf *dbp;
1267         size_t boff;
1268         size_t psize;
1269         int error;
1270         int temp_check = HAMMER2_DEC_CHECK(chain->bref.methods);
1271
1272         KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED);
1273
1274         switch(chain->bref.type) {
1275         case HAMMER2_BREF_TYPE_INODE:
1276                 KKASSERT(chain->data->ipdata.op_flags &
1277                          HAMMER2_OPFLAG_DIRECTDATA);
1278                 KKASSERT(bp->b_loffset == 0);
1279                 bcopy(bp->b_data, chain->data->ipdata.u.data,
1280                       HAMMER2_EMBEDDED_BYTES);
1281                 error = 0;
1282                 break;
1283         case HAMMER2_BREF_TYPE_DATA:
1284                 psize = hammer2_devblksize(chain->bytes);
1285                 pmask = (hammer2_off_t)psize - 1;
1286                 pbase = chain->bref.data_off & ~pmask;
1287                 boff = chain->bref.data_off & (HAMMER2_OFF_MASK & pmask);
1288                 peof = (pbase + HAMMER2_SEGMASK64) & ~HAMMER2_SEGMASK64;
1289
1290                 if (psize == pblksize) {
1291                         dbp = getblk(chain->hmp->devvp, pbase,
1292                                      psize, 0, 0);
1293                         error = 0;
1294                 } else {
1295                         error = bread(chain->hmp->devvp, pbase, psize, &dbp);
1296                         if (error) {
1297                                 kprintf("hammer2: WRITE PATH: "
1298                                         "dbp bread error\n");
1299                                 break;
1300                         }
1301                 }
1302
1303                 chain->bref.methods = HAMMER2_ENC_COMP(HAMMER2_COMP_NONE) +
1304                                       HAMMER2_ENC_CHECK(temp_check);
1305                 bcopy(bp->b_data, dbp->b_data + boff, chain->bytes);
1306
1307                 /*
1308                  * Device buffer is now valid, chain is no
1309                  * longer in the initial state.
1310                  */
1311                 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1312
1313                 if (ioflag & IO_SYNC) {
1314                         /*
1315                          * Synchronous I/O requested.
1316                          */
1317                         bwrite(dbp);
1318                 /*
1319                 } else if ((ioflag & IO_DIRECT) && loff + n == pblksize) {
1320                         bdwrite(dbp);
1321                 */
1322                 } else if (ioflag & IO_ASYNC) {
1323                         bawrite(dbp);
1324                 } else if (hammer2_cluster_enable) {
1325                         cluster_write(dbp, peof, HAMMER2_PBUFSIZE, 4/*XXX*/);
1326                 } else {
1327                         bdwrite(dbp);
1328                 }
1329                 break;
1330         default:
1331                 panic("hammer2_write_bp: bad chain type %d\n",
1332                       chain->bref.type);
1333                 /* NOT REACHED */
1334                 error = 0;
1335                 break;
1336         }
1337         *errorp = error;
1338 }
1339
1340 static
1341 int
1342 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
1343                 struct ucred *cred)
1344 {
1345         return (0);
1346 }
1347
1348 static
1349 int
1350 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1351 {
1352         hammer2_pfsmount_t *pmp;
1353         hammer2_mount_t *hmp;
1354         hammer2_cluster_t *cluster;
1355         int flags;
1356         int error = 0;
1357         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1358         int dumpcnt;
1359         struct vnode *devvp;
1360
1361         pmp = MPTOPMP(mp);
1362         cluster = pmp->mount_cluster;
1363         hmp = cluster->hmp;
1364         flags = 0;
1365
1366         if (mntflags & MNT_FORCE)
1367                 flags |= FORCECLOSE;
1368
1369         hammer2_mount_exlock(hmp);
1370
1371         /*
1372          * If mount initialization proceeded far enough we must flush
1373          * its vnodes.
1374          */
1375         if (pmp->iroot)
1376                 error = vflush(mp, 0, flags);
1377
1378         if (error) {
1379                 hammer2_mount_unlock(hmp);
1380                 return error;
1381         }
1382
1383         lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1384         --hmp->pmp_count;
1385         kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
1386
1387         /*
1388          * Flush any left over chains.  The voldata lock is only used
1389          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
1390          */
1391         hammer2_voldata_lock(hmp);
1392         if ((hmp->vchain.flags | hmp->fchain.flags) &
1393             (HAMMER2_CHAIN_MODIFIED | HAMMER2_CHAIN_SUBMODIFIED)) {
1394                 hammer2_voldata_unlock(hmp, 0);
1395                 hammer2_vfs_sync(mp, MNT_WAIT);
1396                 hammer2_vfs_sync(mp, MNT_WAIT);
1397         } else {
1398                 hammer2_voldata_unlock(hmp, 0);
1399         }
1400         if (hmp->pmp_count == 0) {
1401                 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
1402                                          HAMMER2_CHAIN_SUBMODIFIED)) {
1403                         kprintf("hammer2_unmount: chains left over after "
1404                                 "final sync\n");
1405                         if (hammer2_debug & 0x0010)
1406                                 Debugger("entered debugger");
1407                 }
1408         }
1409
1410         /*
1411          * Cleanup the root and super-root chain elements (which should be
1412          * clean).
1413          */
1414         if (pmp->iroot) {
1415 #if REPORT_REFS_ERRORS
1416                 if (pmp->iroot->refs != 1)
1417                         kprintf("PMP->IROOT %p REFS WRONG %d\n",
1418                                 pmp->iroot, pmp->iroot->refs);
1419 #else
1420                 KKASSERT(pmp->iroot->refs == 1);
1421 #endif
1422                 hammer2_inode_drop(pmp->iroot);     /* ref for pmp->iroot */
1423                 pmp->iroot = NULL;
1424         }
1425         if (cluster->rchain) {
1426                 atomic_clear_int(&cluster->rchain->flags,
1427                                  HAMMER2_CHAIN_MOUNTED);
1428 #if REPORT_REFS_ERRORS
1429                 if (cluster->rchain->refs != 1)
1430                         kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
1431                                 cluster->rchain, cluster->rchain->refs);
1432 #else
1433                 KKASSERT(cluster->rchain->refs == 1);
1434 #endif
1435                 hammer2_chain_drop(cluster->rchain);
1436                 cluster->rchain = NULL;
1437         }
1438         ccms_domain_uninit(&pmp->ccms_dom);
1439
1440         /*
1441          * Kill cluster controller
1442          */
1443         kdmsg_iocom_uninit(&pmp->iocom);
1444
1445         /*
1446          * If no PFS's left drop the master hammer2_mount for the device.
1447          */
1448         if (hmp->pmp_count == 0) {
1449                 if (hmp->sroot) {
1450                         hammer2_inode_drop(hmp->sroot);
1451                         hmp->sroot = NULL;
1452                 }
1453                 if (hmp->schain) {
1454 #if REPORT_REFS_ERRORS
1455                         if (hmp->schain->refs != 1)
1456                                 kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
1457                                         hmp->schain, hmp->schain->refs);
1458 #else
1459                         KKASSERT(hmp->schain->refs == 1);
1460 #endif
1461                         hammer2_chain_drop(hmp->schain);
1462                         hmp->schain = NULL;
1463                 }
1464
1465                 /*
1466                  * Finish up with the device vnode
1467                  */
1468                 if ((devvp = hmp->devvp) != NULL) {
1469                         vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1470                         hmp->devvp = NULL;
1471                         VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
1472                         vrele(devvp);
1473                         devvp = NULL;
1474                 }
1475
1476                 /*
1477                  * Final drop of embedded freemap root chain to clean up
1478                  * fchain.core (fchain structure is not flagged ALLOCATED
1479                  * so it is cleaned out and then left to rot).
1480                  */
1481                 hammer2_chain_drop(&hmp->fchain);
1482
1483                 /*
1484                  * Final drop of embedded volume root chain to clean up
1485                  * vchain.core (vchain structure is not flagged ALLOCATED
1486                  * so it is cleaned out and then left to rot).
1487                  */
1488                 dumpcnt = 50;
1489                 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
1490                 hammer2_mount_unlock(hmp);
1491                 hammer2_chain_drop(&hmp->vchain);
1492         } else {
1493                 hammer2_mount_unlock(hmp);
1494         }
1495
1496         pmp->mp = NULL;
1497         mp->mnt_data = NULL;
1498
1499         pmp->mount_cluster = NULL;
1500         pmp->cluster = NULL;            /* XXX */
1501
1502         kmalloc_destroy(&pmp->mmsg);
1503         kmalloc_destroy(&pmp->minode);
1504
1505         cluster->hmp = NULL;
1506
1507         kfree(cluster, M_HAMMER2);
1508         kfree(pmp, M_HAMMER2);
1509         if (hmp->pmp_count == 0) {
1510                 mtx_lock(&hmp->wthread_mtx);
1511                 hmp->wthread_destroy = 1;
1512                 wakeup(&hmp->wthread_bioq);
1513                 while (hmp->wthread_destroy != -1) {
1514                         mtxsleep(&hmp->wthread_destroy, &hmp->wthread_mtx, 0,
1515                                 "umount-sleep", 0);
1516                 }
1517                 mtx_unlock(&hmp->wthread_mtx);
1518
1519                 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1520                 kmalloc_destroy(&hmp->mchain);
1521                 kfree(hmp, M_HAMMER2);
1522         }
1523         lockmgr(&hammer2_mntlk, LK_RELEASE);
1524
1525         return (error);
1526 }
1527
1528 static
1529 int
1530 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1531              ino_t ino, struct vnode **vpp)
1532 {
1533         kprintf("hammer2_vget\n");
1534         return (EOPNOTSUPP);
1535 }
1536
1537 static
1538 int
1539 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1540 {
1541         hammer2_pfsmount_t *pmp;
1542         hammer2_chain_t *parent;
1543         int error;
1544         struct vnode *vp;
1545
1546         pmp = MPTOPMP(mp);
1547         if (pmp->iroot == NULL) {
1548                 *vpp = NULL;
1549                 error = EINVAL;
1550         } else {
1551                 parent = hammer2_inode_lock_sh(pmp->iroot);
1552                 vp = hammer2_igetv(pmp->iroot, &error);
1553                 hammer2_inode_unlock_sh(pmp->iroot, parent);
1554                 *vpp = vp;
1555                 if (vp == NULL)
1556                         kprintf("vnodefail\n");
1557         }
1558
1559         return (error);
1560 }
1561
1562 /*
1563  * Filesystem status
1564  *
1565  * XXX incorporate ipdata->inode_quota and data_quota
1566  */
1567 static
1568 int
1569 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1570 {
1571         hammer2_pfsmount_t *pmp;
1572         hammer2_mount_t *hmp;
1573
1574         pmp = MPTOPMP(mp);
1575         hmp = MPTOHMP(mp);
1576
1577         mp->mnt_stat.f_files = pmp->inode_count;
1578         mp->mnt_stat.f_ffree = 0;
1579         mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1580         mp->mnt_stat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1581         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1582
1583         *sbp = mp->mnt_stat;
1584         return (0);
1585 }
1586
1587 static
1588 int
1589 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1590 {
1591         hammer2_pfsmount_t *pmp;
1592         hammer2_mount_t *hmp;
1593
1594         pmp = MPTOPMP(mp);
1595         hmp = MPTOHMP(mp);
1596
1597         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1598         mp->mnt_vstat.f_files = pmp->inode_count;
1599         mp->mnt_vstat.f_ffree = 0;
1600         mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
1601         mp->mnt_vstat.f_bfree =  hmp->voldata.allocator_free / HAMMER2_PBUFSIZE;
1602         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1603
1604         *sbp = mp->mnt_vstat;
1605         return (0);
1606 }
1607
1608 /*
1609  * Sync the entire filesystem; this is called from the filesystem syncer
1610  * process periodically and whenever a user calls sync(1) on the hammer
1611  * mountpoint.
1612  *
1613  * Currently is actually called from the syncer! \o/
1614  *
1615  * This task will have to snapshot the state of the dirty inode chain.
1616  * From that, it will have to make sure all of the inodes on the dirty
1617  * chain have IO initiated. We make sure that io is initiated for the root
1618  * block.
1619  *
1620  * If waitfor is set, we wait for media to acknowledge the new rootblock.
1621  *
1622  * THINKS: side A vs side B, to have sync not stall all I/O?
1623  */
1624 static
1625 int
1626 hammer2_vfs_sync(struct mount *mp, int waitfor)
1627 {
1628         struct hammer2_sync_info info;
1629         hammer2_pfsmount_t *pmp;
1630         hammer2_cluster_t *cluster;
1631         hammer2_mount_t *hmp;
1632         int flags;
1633         int error;
1634         int i;
1635
1636         pmp = MPTOPMP(mp);
1637
1638         /*
1639          * We can't acquire locks on existing vnodes while in a transaction
1640          * without risking a deadlock.  This assumes that vfsync() can be
1641          * called without the vnode locked (which it can in DragonFly).
1642          * Otherwise we'd have to implement a multi-pass or flag the lock
1643          * failures and retry.
1644          */
1645         /*flags = VMSC_GETVP;*/
1646         flags = 0;
1647         if (waitfor & MNT_LAZY)
1648                 flags |= VMSC_ONEPASS;
1649
1650         hammer2_trans_init(&info.trans, pmp, HAMMER2_TRANS_ISFLUSH);
1651
1652         info.error = 0;
1653         info.waitfor = MNT_NOWAIT;
1654         vmntvnodescan(mp, flags | VMSC_NOWAIT,
1655                       hammer2_sync_scan1,
1656                       hammer2_sync_scan2, &info);
1657         if (info.error == 0 && (waitfor & MNT_WAIT)) {
1658                 info.waitfor = waitfor;
1659                     vmntvnodescan(mp, flags,
1660                                   hammer2_sync_scan1,
1661                                   hammer2_sync_scan2, &info);
1662
1663         }
1664 #if 0
1665         if (waitfor == MNT_WAIT) {
1666                 /* XXX */
1667         } else {
1668                 /* XXX */
1669         }
1670 #endif
1671
1672         cluster = pmp->cluster;
1673         hmp = cluster->hmp;
1674
1675         hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1676         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
1677                                   HAMMER2_CHAIN_SUBMODIFIED)) {
1678                 hammer2_chain_flush(&info.trans, &hmp->vchain);
1679         }
1680         hammer2_chain_unlock(&hmp->vchain);
1681
1682 #if 1
1683         /*
1684          * Rollup flush.  The fsyncs above basically just flushed
1685          * data blocks.  The flush below gets all the meta-data.
1686          */
1687         hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1688         if (hmp->fchain.flags & (HAMMER2_CHAIN_MODIFIED |
1689                                  HAMMER2_CHAIN_SUBMODIFIED)) {
1690                 /* this will modify vchain as a side effect */
1691                 hammer2_chain_flush(&info.trans, &hmp->fchain);
1692         }
1693         hammer2_chain_unlock(&hmp->fchain);
1694 #endif
1695
1696
1697         error = 0;
1698
1699         /*
1700          * We can't safely flush the volume header until we have
1701          * flushed any device buffers which have built up.
1702          *
1703          * XXX this isn't being incremental
1704          */
1705         vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
1706         error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
1707         vn_unlock(hmp->devvp);
1708
1709         /*
1710          * The flush code sets CHAIN_VOLUMESYNC to indicate that the
1711          * volume header needs synchronization via hmp->volsync.
1712          *
1713          * XXX synchronize the flag & data with only this flush XXX
1714          */
1715         if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
1716                 struct buf *bp;
1717
1718                 /*
1719                  * Synchronize the disk before flushing the volume
1720                  * header.
1721                  */
1722                 bp = getpbuf(NULL);
1723                 bp->b_bio1.bio_offset = 0;
1724                 bp->b_bufsize = 0;
1725                 bp->b_bcount = 0;
1726                 bp->b_cmd = BUF_CMD_FLUSH;
1727                 bp->b_bio1.bio_done = biodone_sync;
1728                 bp->b_bio1.bio_flags |= BIO_SYNC;
1729                 vn_strategy(hmp->devvp, &bp->b_bio1);
1730                 biowait(&bp->b_bio1, "h2vol");
1731                 relpbuf(bp, NULL);
1732
1733                 /*
1734                  * Then we can safely flush the version of the volume header
1735                  * synchronized by the flush code.
1736                  */
1737                 i = hmp->volhdrno + 1;
1738                 if (i >= HAMMER2_NUM_VOLHDRS)
1739                         i = 0;
1740                 if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
1741                     hmp->volsync.volu_size) {
1742                         i = 0;
1743                 }
1744                 kprintf("sync volhdr %d %jd\n",
1745                         i, (intmax_t)hmp->volsync.volu_size);
1746                 bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1747                             HAMMER2_PBUFSIZE, 0, 0);
1748                 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
1749                 bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
1750                 bawrite(bp);
1751                 hmp->volhdrno = i;
1752         }
1753         hammer2_trans_done(&info.trans);
1754         return (error);
1755 }
1756
1757 /*
1758  * Sync passes.
1759  *
1760  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
1761  *       won't flush on those flags.  The syncer code above will do a
1762  *       general meta-data flush globally that will catch these flags.
1763  */
1764 static int
1765 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
1766 {
1767         hammer2_inode_t *ip;
1768
1769         ip = VTOI(vp);
1770         if (vp->v_type == VNON || ip == NULL ||
1771             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
1772              RB_EMPTY(&vp->v_rbdirty_tree))) {
1773                 return(-1);
1774         }
1775         return(0);
1776 }
1777
1778 static int
1779 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
1780 {
1781         struct hammer2_sync_info *info = data;
1782         hammer2_inode_t *ip;
1783         hammer2_chain_t *parent;
1784         int error;
1785
1786         ip = VTOI(vp);
1787         if (vp->v_type == VNON || vp->v_type == VBAD ||
1788             ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
1789              RB_EMPTY(&vp->v_rbdirty_tree))) {
1790                 return(0);
1791         }
1792
1793         /*
1794          * VOP_FSYNC will start a new transaction so replicate some code
1795          * here to do it inline (see hammer2_vop_fsync()).
1796          *
1797          * WARNING: The vfsync interacts with the buffer cache and might
1798          *          block, we can't hold the inode lock at that time.
1799          */
1800         atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1801         if (ip->vp)
1802                 vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
1803         parent = hammer2_inode_lock_ex(ip);
1804         hammer2_chain_flush(&info->trans, parent);
1805         hammer2_inode_unlock_ex(ip, parent);
1806         error = 0;
1807 #if 0
1808         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
1809 #endif
1810         if (error)
1811                 info->error = error;
1812         return(0);
1813 }
1814
1815 static
1816 int
1817 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1818 {
1819         return (0);
1820 }
1821
1822 static
1823 int
1824 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1825                struct fid *fhp, struct vnode **vpp)
1826 {
1827         return (0);
1828 }
1829
1830 static
1831 int
1832 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1833                  int *exflagsp, struct ucred **credanonp)
1834 {
1835         return (0);
1836 }
1837
1838 /*
1839  * Support code for hammer2_mount().  Read, verify, and install the volume
1840  * header into the HMP
1841  *
1842  * XXX read four volhdrs and use the one with the highest TID whos CRC
1843  *     matches.
1844  *
1845  * XXX check iCRCs.
1846  *
1847  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1848  *     nonexistant locations.
1849  *
1850  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1851  */
1852 static
1853 int
1854 hammer2_install_volume_header(hammer2_mount_t *hmp)
1855 {
1856         hammer2_volume_data_t *vd;
1857         struct buf *bp;
1858         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1859         int error_reported;
1860         int error;
1861         int valid;
1862         int i;
1863
1864         error_reported = 0;
1865         error = 0;
1866         valid = 0;
1867         bp = NULL;
1868
1869         /*
1870          * There are up to 4 copies of the volume header (syncs iterate
1871          * between them so there is no single master).  We don't trust the
1872          * volu_size field so we don't know precisely how large the filesystem
1873          * is, so depend on the OS to return an error if we go beyond the
1874          * block device's EOF.
1875          */
1876         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1877                 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1878                               HAMMER2_VOLUME_BYTES, &bp);
1879                 if (error) {
1880                         brelse(bp);
1881                         bp = NULL;
1882                         continue;
1883                 }
1884
1885                 vd = (struct hammer2_volume_data *) bp->b_data;
1886                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1887                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1888                         brelse(bp);
1889                         bp = NULL;
1890                         continue;
1891                 }
1892
1893                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1894                         /* XXX: Reversed-endianness filesystem */
1895                         kprintf("hammer2: reverse-endian filesystem detected");
1896                         brelse(bp);
1897                         bp = NULL;
1898                         continue;
1899                 }
1900
1901                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1902                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1903                                       HAMMER2_VOLUME_ICRC0_SIZE);
1904                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1905                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1906                                        HAMMER2_VOLUME_ICRC1_SIZE);
1907                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
1908                         kprintf("hammer2 volume header crc "
1909                                 "mismatch copy #%d %08x/%08x\n",
1910                                 i, crc0, crc);
1911                         error_reported = 1;
1912                         brelse(bp);
1913                         bp = NULL;
1914                         continue;
1915                 }
1916                 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1917                         valid = 1;
1918                         hmp->voldata = *vd;
1919                         hmp->volhdrno = i;
1920                 }
1921                 brelse(bp);
1922                 bp = NULL;
1923         }
1924         if (valid) {
1925                 hmp->volsync = hmp->voldata;
1926                 error = 0;
1927                 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1928                         kprintf("hammer2: using volume header #%d\n",
1929                                 hmp->volhdrno);
1930                 }
1931         } else {
1932                 error = EINVAL;
1933                 kprintf("hammer2: no valid volume headers found!\n");
1934         }
1935         return (error);
1936 }
1937
1938 /*
1939  * Reconnect using the passed file pointer.  The caller must ref the
1940  * fp for us.
1941  */
1942 void
1943 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1944 {
1945         hammer2_inode_data_t *ipdata;
1946         hammer2_chain_t *parent;
1947         hammer2_mount_t *hmp;
1948         size_t name_len;
1949
1950         hmp = pmp->mount_cluster->hmp;
1951
1952         /*
1953          * Closes old comm descriptor, kills threads, cleans up
1954          * states, then installs the new descriptor and creates
1955          * new threads.
1956          */
1957         kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1958
1959         /*
1960          * Setup LNK_CONN fields for autoinitiated state machine
1961          */
1962         parent = hammer2_inode_lock_ex(pmp->iroot);
1963         ipdata = &parent->data->ipdata;
1964         pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1965         pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1966         pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1967         pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1968         pmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
1969
1970         /*
1971          * Filter adjustment.  Clients do not need visibility into other
1972          * clients (otherwise millions of clients would present a serious
1973          * problem).  The fs_label also serves to restrict the namespace.
1974          */
1975         pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1976         pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1977         switch (ipdata->pfs_type) {
1978         case DMSG_PFSTYPE_CLIENT:
1979                 pmp->iocom.auto_lnk_conn.peer_mask &=
1980                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1981                 break;
1982         default:
1983                 break;
1984         }
1985
1986         name_len = ipdata->name_len;
1987         if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1988                 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1989         bcopy(ipdata->filename,
1990               pmp->iocom.auto_lnk_conn.fs_label,
1991               name_len);
1992         pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1993
1994         /*
1995          * Setup LNK_SPAN fields for autoinitiated state machine
1996          */
1997         pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1998         pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1999         pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
2000         pmp->iocom.auto_lnk_span.peer_type = hmp->voldata.peer_type;
2001         pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
2002         name_len = ipdata->name_len;
2003         if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
2004                 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
2005         bcopy(ipdata->filename,
2006               pmp->iocom.auto_lnk_span.fs_label,
2007               name_len);
2008         pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
2009         hammer2_inode_unlock_ex(pmp->iroot, parent);
2010
2011         kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
2012 }
2013
2014 static int
2015 hammer2_rcvdmsg(kdmsg_msg_t *msg)
2016 {
2017         switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
2018         case DMSG_DBG_SHELL:
2019                 /*
2020                  * (non-transaction)
2021                  * Execute shell command (not supported atm)
2022                  */
2023                 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2024                 break;
2025         case DMSG_DBG_SHELL | DMSGF_REPLY:
2026                 /*
2027                  * (non-transaction)
2028                  */
2029                 if (msg->aux_data) {
2030                         msg->aux_data[msg->aux_size - 1] = 0;
2031                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
2032                 }
2033                 break;
2034         default:
2035                 /*
2036                  * Unsupported message received.  We only need to
2037                  * reply if it's a transaction in order to close our end.
2038                  * Ignore any one-way messages are any further messages
2039                  * associated with the transaction.
2040                  *
2041                  * NOTE: This case also includes DMSG_LNK_ERROR messages
2042                  *       which might be one-way, replying to those would
2043                  *       cause an infinite ping-pong.
2044                  */
2045                 if (msg->any.head.cmd & DMSGF_CREATE)
2046                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
2047                 break;
2048         }
2049         return(0);
2050 }
2051
2052 /*
2053  * This function is called after KDMSG has automatically handled processing
2054  * of a LNK layer message (typically CONN, SPAN, or CIRC).
2055  *
2056  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
2057  * advertises all available hammer2 super-root volumes.
2058  */
2059 static void
2060 hammer2_autodmsg(kdmsg_msg_t *msg)
2061 {
2062         hammer2_pfsmount_t *pmp = msg->iocom->handle;
2063         hammer2_mount_t *hmp = pmp->mount_cluster->hmp;
2064         int copyid;
2065
2066         /*
2067          * We only care about replies to our LNK_CONN auto-request.  kdmsg
2068          * has already processed the reply, we use this calback as a shim
2069          * to know when we can advertise available super-root volumes.
2070          */
2071         if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
2072             (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
2073             msg->state == NULL) {
2074                 return;
2075         }
2076
2077         kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
2078
2079         if (msg->any.head.cmd & DMSGF_CREATE) {
2080                 kprintf("HAMMER2: VOLDATA DUMP\n");
2081
2082                 /*
2083                  * Dump the configuration stored in the volume header
2084                  */
2085                 hammer2_voldata_lock(hmp);
2086                 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
2087                         if (hmp->voldata.copyinfo[copyid].copyid == 0)
2088                                 continue;
2089                         hammer2_volconf_update(pmp, copyid);
2090                 }
2091                 hammer2_voldata_unlock(hmp, 0);
2092         }
2093         if ((msg->any.head.cmd & DMSGF_DELETE) &&
2094             msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
2095                 kprintf("HAMMER2: CONN WAS TERMINATED\n");
2096         }
2097 }
2098
2099 /*
2100  * Volume configuration updates are passed onto the userland service
2101  * daemon via the open LNK_CONN transaction.
2102  */
2103 void
2104 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
2105 {
2106         hammer2_mount_t *hmp = pmp->mount_cluster->hmp;
2107         kdmsg_msg_t *msg;
2108
2109         /* XXX interlock against connection state termination */
2110         kprintf("volconf update %p\n", pmp->iocom.conn_state);
2111         if (pmp->iocom.conn_state) {
2112                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
2113                 msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
2114                                             DMSG_LNK_VOLCONF, NULL, NULL);
2115                 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
2116                 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
2117                 msg->any.lnk_volconf.index = index;
2118                 kdmsg_msg_write(msg);
2119         }
2120 }
2121
2122 void
2123 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
2124 {
2125         hammer2_chain_layer_t *layer;
2126         hammer2_chain_t *scan;
2127         hammer2_chain_t *first_parent;
2128
2129         --*countp;
2130         if (*countp == 0) {
2131                 kprintf("%*.*s...\n", tab, tab, "");
2132                 return;
2133         }
2134         if (*countp < 0)
2135                 return;
2136         first_parent = chain->core ? TAILQ_FIRST(&chain->core->ownerq) : NULL;
2137         kprintf("%*.*schain %p.%d [%08x][core=%p fp=%p] (%s) np=%p dt=%s refs=%d",
2138                 tab, tab, "",
2139                 chain, chain->bref.type, chain->flags,
2140                 chain->core,
2141                 first_parent,
2142                 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2143                 chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
2144                 (first_parent ? TAILQ_NEXT(chain, core_entry) : NULL),
2145                 (chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
2146                 chain->refs);
2147         if (first_parent)
2148                 kprintf(" [fpflags %08x fprefs %d\n",
2149                         first_parent->flags,
2150                         first_parent->refs);
2151         if (chain->core == NULL || TAILQ_EMPTY(&chain->core->layerq))
2152                 kprintf("\n");
2153         else
2154                 kprintf(" {\n");
2155         TAILQ_FOREACH(layer, &chain->core->layerq, entry) {
2156                 RB_FOREACH(scan, hammer2_chain_tree, &layer->rbtree) {
2157                         hammer2_dump_chain(scan, tab + 4, countp);
2158                 }
2159         }
2160         if (chain->core && !TAILQ_EMPTY(&chain->core->layerq)) {
2161                 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2162                         kprintf("%*.*s}(%s)\n", tab, tab, "",
2163                                 chain->data->ipdata.filename);
2164                 else
2165                         kprintf("%*.*s}\n", tab, tab, "");
2166         }
2167 }