sys/vfs/hammer2/hammer2_vfsops.c

   1 /*-
   2  * Copyright (c) 2011, 2012 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/nlookup.h>
  38 #include <sys/vnode.h>
  39 #include <sys/mount.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/buf.h>
  42 #include <sys/uuid.h>
  43 #include <sys/vfsops.h>
  44 #include <sys/sysctl.h>
  45
  46 #include "hammer2.h"
  47 #include "hammer2_disk.h"
  48 #include "hammer2_mount.h"
  49
  50 struct hammer2_sync_info {
  51         int error;
  52         int waitfor;
  53 };
  54
  55 int hammer2_debug;
  56 int hammer2_cluster_enable = 1;
  57 long hammer2_iod_file_read;
  58 long hammer2_iod_meta_read;
  59 long hammer2_iod_indr_read;
  60 long hammer2_iod_file_write;
  61 long hammer2_iod_meta_write;
  62 long hammer2_iod_indr_write;
  63 long hammer2_iod_volu_write;
  64 long hammer2_ioa_file_read;
  65 long hammer2_ioa_meta_read;
  66 long hammer2_ioa_indr_read;
  67 long hammer2_ioa_file_write;
  68 long hammer2_ioa_meta_write;
  69 long hammer2_ioa_indr_write;
  70 long hammer2_ioa_volu_write;
  71
  72 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
  73
  74 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
  75            &hammer2_debug, 0, "");
  76 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
  77            &hammer2_cluster_enable, 0, "");
  78 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
  79            &hammer2_iod_file_read, 0, "");
  80 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
  81            &hammer2_iod_meta_read, 0, "");
  82 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
  83            &hammer2_iod_indr_read, 0, "");
  84 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
  85            &hammer2_iod_file_write, 0, "");
  86 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
  87            &hammer2_iod_meta_write, 0, "");
  88 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
  89            &hammer2_iod_indr_write, 0, "");
  90 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
  91            &hammer2_iod_volu_write, 0, "");
  92 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
  93            &hammer2_ioa_file_read, 0, "");
  94 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
  95            &hammer2_ioa_meta_read, 0, "");
  96 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
  97            &hammer2_ioa_indr_read, 0, "");
  98 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
  99            &hammer2_ioa_file_write, 0, "");
 100 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
 101            &hammer2_ioa_meta_write, 0, "");
 102 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
 103            &hammer2_ioa_indr_write, 0, "");
 104 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
 105            &hammer2_ioa_volu_write, 0, "");
 106
 107 static int hammer2_vfs_init(struct vfsconf *conf);
 108 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 109                                 struct ucred *cred);
 110 static int hammer2_remount(struct mount *, char *, struct vnode *,
 111                                 struct ucred *);
 112 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
 113 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
 114 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
 115                                 struct ucred *cred);
 116 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
 117                                 struct ucred *cred);
 118 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
 119 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 120                                 ino_t ino, struct vnode **vpp);
 121 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 122                                 struct fid *fhp, struct vnode **vpp);
 123 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
 124 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 125                                 int *exflagsp, struct ucred **credanonp);
 126
 127 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
 128 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
 129 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
 130
 131 /*
 132  * HAMMER2 vfs operations.
 133  */
 134 static struct vfsops hammer2_vfsops = {
 135         .vfs_init       = hammer2_vfs_init,
 136         .vfs_sync       = hammer2_vfs_sync,
 137         .vfs_mount      = hammer2_vfs_mount,
 138         .vfs_unmount    = hammer2_vfs_unmount,
 139         .vfs_root       = hammer2_vfs_root,
 140         .vfs_statfs     = hammer2_vfs_statfs,
 141         .vfs_statvfs    = hammer2_vfs_statvfs,
 142         .vfs_vget       = hammer2_vfs_vget,
 143         .vfs_vptofh     = hammer2_vfs_vptofh,
 144         .vfs_fhtovp     = hammer2_vfs_fhtovp,
 145         .vfs_checkexp   = hammer2_vfs_checkexp
 146 };
 147
 148 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
 149
 150 VFS_SET(hammer2_vfsops, hammer2, 0);
 151 MODULE_VERSION(hammer2, 1);
 152
 153 static
 154 int
 155 hammer2_vfs_init(struct vfsconf *conf)
 156 {
 157         int error;
 158
 159         error = 0;
 160
 161         if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
 162                 error = EINVAL;
 163         if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
 164                 error = EINVAL;
 165         if (HAMMER2_ALLOCREF_BYTES != sizeof(struct hammer2_allocref))
 166                 error = EINVAL;
 167         if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
 168                 error = EINVAL;
 169
 170         if (error)
 171                 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
 172
 173         return (error);
 174 }
 175
 176 /*
 177  * Mount or remount HAMMER2 fileystem from physical media
 178  *
 179  *      mountroot
 180  *              mp              mount point structure
 181  *              path            NULL
 182  *              data            <unused>
 183  *              cred            <unused>
 184  *
 185  *      mount
 186  *              mp              mount point structure
 187  *              path            path to mount point
 188  *              data            pointer to argument structure in user space
 189  *                      volume  volume path (device@LABEL form)
 190  *                      hflags  user mount flags
 191  *              cred            user credentials
 192  *
 193  * RETURNS:     0       Success
 194  *              !0      error number
 195  */
 196 static
 197 int
 198 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
 199               struct ucred *cred)
 200 {
 201         struct hammer2_mount_info info;
 202         hammer2_mount_t *hmp;
 203         hammer2_key_t lhc;
 204         struct vnode *devvp;
 205         struct nlookupdata nd;
 206         hammer2_chain_t *parent;
 207         hammer2_chain_t *schain;
 208         hammer2_chain_t *rchain;
 209         char devstr[MNAMELEN];
 210         size_t size;
 211         size_t done;
 212         char *dev;
 213         char *label;
 214         int ronly = 1;
 215         int error;
 216
 217         hmp = NULL;
 218         dev = NULL;
 219         label = NULL;
 220         devvp = NULL;
 221
 222         kprintf("hammer2_mount\n");
 223
 224         if (path == NULL) {
 225                 /*
 226                  * Root mount
 227                  */
 228                 return (EOPNOTSUPP);
 229         } else {
 230                 /*
 231                  * Non-root mount or updating a mount
 232                  */
 233                 error = copyin(data, &info, sizeof(info));
 234                 if (error)
 235                         return (error);
 236
 237                 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
 238                 if (error)
 239                         return (error);
 240
 241                 /* Extract device and label */
 242                 dev = devstr;
 243                 label = strchr(devstr, '@');
 244                 if (label == NULL ||
 245                     ((label + 1) - dev) > done) {
 246                         return (EINVAL);
 247                 }
 248                 *label = '\0';
 249                 label++;
 250                 if (*label == '\0')
 251                         return (EINVAL);
 252
 253                 if (mp->mnt_flag & MNT_UPDATE) {
 254                         /* Update mount */
 255                         /* HAMMER2 implements NFS export via mountctl */
 256                         hmp = MPTOH2(mp);
 257                         devvp = hmp->devvp;
 258                         error = hammer2_remount(mp, path, devvp, cred);
 259                         return error;
 260                 }
 261         }
 262
 263         /*
 264          * New non-root mount
 265          */
 266         /* Lookup name and verify it refers to a block device */
 267         error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
 268         if (error == 0)
 269                 error = nlookup(&nd);
 270         if (error == 0)
 271                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 272         nlookup_done(&nd);
 273
 274         if (error == 0) {
 275                 if (vn_isdisk(devvp, &error))
 276                         error = vfs_mountedon(devvp);
 277         }
 278         if (error == 0 && vcount(devvp) > 0)
 279                 error = EBUSY;
 280
 281         /*
 282          * Now open the device
 283          */
 284         if (error == 0) {
 285                 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 286                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 287                 error = vinvalbuf(devvp, V_SAVE, 0, 0);
 288                 if (error == 0) {
 289                         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE,
 290                                          FSCRED, NULL);
 291                 }
 292                 vn_unlock(devvp);
 293         }
 294         if (error && devvp) {
 295                 vrele(devvp);
 296                 devvp = NULL;
 297         }
 298         if (error)
 299                 return error;
 300
 301         /*
 302          * Block device opened successfully, finish initializing the
 303          * mount structure.
 304          *
 305          * From this point on we have to call hammer2_unmount() on failure.
 306          */
 307         hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
 308         mp->mnt_data = (qaddr_t)hmp;
 309         hmp->mp = mp;
 310         hmp->ronly = ronly;
 311         hmp->devvp = devvp;
 312         kmalloc_create(&hmp->minode, "HAMMER2-inodes");
 313         kmalloc_create(&hmp->mchain, "HAMMER2-chains");
 314
 315         mp->mnt_flag = MNT_LOCAL;
 316         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;   /* all entry pts are SMP */
 317
 318         /*
 319          * vchain setup. vchain.data is special cased to NULL.  vchain.refs
 320          * is initialized and will never drop to 0.
 321          */
 322         hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
 323         hmp->vchain.refs = 1;
 324         hmp->vchain.data = (void *)&hmp->voldata;
 325         hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
 326         /* hmp->vchain.u.xxx is left NULL */
 327         lockinit(&hmp->vchain.lk, "volume", 0, LK_CANRECURSE);
 328         lockinit(&hmp->alloclk, "h2alloc", 0, 0);
 329         lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
 330
 331         /*
 332          * Install the volume header
 333          */
 334         error = hammer2_install_volume_header(hmp);
 335         if (error) {
 336                 hammer2_vfs_unmount(mp, MNT_FORCE);
 337                 return error;
 338         }
 339
 340         /*
 341          * required mount structure initializations
 342          */
 343         mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
 344         mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
 345
 346         mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
 347         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 348
 349         /*
 350          * Optional fields
 351          */
 352         mp->mnt_iosize_max = MAXPHYS;
 353
 354         /*
 355          * First locate the super-root inode, which is key 0 relative to the
 356          * volume header's blockset.
 357          *
 358          * Then locate the root inode by scanning the directory keyspace
 359          * represented by the label.
 360          */
 361         lhc = hammer2_dirhash(label, strlen(label));
 362         parent = &hmp->vchain;
 363         hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
 364         schain = hammer2_chain_lookup(hmp, &parent,
 365                                       HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
 366         hammer2_chain_unlock(hmp, parent);
 367         if (schain == NULL) {
 368                 kprintf("hammer2_mount: invalid super-root\n");
 369                 hammer2_vfs_unmount(mp, MNT_FORCE);
 370                 return EINVAL;
 371         }
 372
 373         hammer2_chain_ref(hmp, schain); /* for hmp->schain */
 374         parent = schain;
 375         rchain = hammer2_chain_lookup(hmp, &parent,
 376                                       lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 377                                       0);
 378         while (rchain) {
 379                 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
 380                     rchain->u.ip &&
 381                     strcmp(label, rchain->data->ipdata.filename) == 0) {
 382                         break;
 383                 }
 384                 rchain = hammer2_chain_next(hmp, &parent, rchain,
 385                                             lhc, lhc + HAMMER2_DIRHASH_LOMASK,
 386                                             0);
 387         }
 388         hammer2_chain_unlock(hmp, parent);
 389         if (rchain == NULL) {
 390                 kprintf("hammer2_mount: root label not found\n");
 391                 hammer2_chain_drop(hmp, schain);
 392                 hammer2_vfs_unmount(mp, MNT_FORCE);
 393                 return EINVAL;
 394         }
 395         hammer2_chain_ref(hmp, rchain); /* for hmp->rchain */
 396         hammer2_chain_unlock(hmp, rchain);
 397
 398         hmp->schain = schain;           /* left held & unlocked */
 399         hmp->rchain = rchain;           /* left held & unlocked */
 400         hmp->iroot = rchain->u.ip;      /* implied hold from rchain */
 401         kprintf("iroot %p\n", rchain->u.ip);
 402
 403         vfs_getnewfsid(mp);
 404         vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
 405         vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
 406         vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
 407
 408         copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 409         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 410         bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
 411         copyinstr(path, mp->mnt_stat.f_mntonname,
 412                   sizeof(mp->mnt_stat.f_mntonname) - 1,
 413                   &size);
 414
 415         hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
 416
 417         return 0;
 418 }
 419
 420 static
 421 int
 422 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
 423                 struct ucred *cred)
 424 {
 425         return (0);
 426 }
 427
 428 static
 429 int
 430 hammer2_vfs_unmount(struct mount *mp, int mntflags)
 431 {
 432         hammer2_mount_t *hmp;
 433         int flags;
 434         int error = 0;
 435         int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 436         struct vnode *devvp;
 437
 438         kprintf("hammer2_unmount\n");
 439
 440         hmp = MPTOH2(mp);
 441         flags = 0;
 442
 443         if (mntflags & MNT_FORCE)
 444                 flags |= FORCECLOSE;
 445
 446         hammer2_mount_exlock(hmp);
 447
 448         /*
 449          * If mount initialization proceeded far enough we must flush
 450          * its vnodes.
 451          */
 452         if (hmp->iroot)
 453                 error = vflush(mp, 0, flags);
 454
 455         if (error)
 456                 return error;
 457
 458         /*
 459          * Flush any left over chains.  The voldata lock is only used
 460          * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
 461          */
 462         hammer2_voldata_lock(hmp);
 463         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 464                                  HAMMER2_CHAIN_MODIFIED_AUX |
 465                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 466                 hammer2_voldata_unlock(hmp);
 467                 hammer2_vfs_sync(mp, MNT_WAIT);
 468         } else {
 469                 hammer2_voldata_unlock(hmp);
 470         }
 471         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 472                                  HAMMER2_CHAIN_MODIFIED_AUX |
 473                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 474                 kprintf("hammer2_unmount: chains left over after final sync\n");
 475                 if (hammer2_debug & 0x0010)
 476                         Debugger("entered debugger");
 477         }
 478
 479         /*
 480          * Cleanup the root and super-root chain elements (which should be
 481          * clean).
 482          */
 483         hmp->iroot = NULL;
 484         if (hmp->rchain) {
 485                 KKASSERT(hmp->rchain->refs == 1);
 486                 hammer2_chain_drop(hmp, hmp->rchain);
 487                 hmp->rchain = NULL;
 488         }
 489         if (hmp->schain) {
 490                 KKASSERT(hmp->schain->refs == 1);
 491                 hammer2_chain_drop(hmp, hmp->schain);
 492                 hmp->schain = NULL;
 493         }
 494
 495         /*
 496          * Finish up with the device vnode
 497          */
 498         if ((devvp = hmp->devvp) != NULL) {
 499                 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
 500                 hmp->devvp = NULL;
 501                 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
 502                 vrele(devvp);
 503                 devvp = NULL;
 504         }
 505
 506         kmalloc_destroy(&hmp->minode);
 507         kmalloc_destroy(&hmp->mchain);
 508
 509         hammer2_mount_unlock(hmp);
 510
 511         mp->mnt_data = NULL;
 512         hmp->mp = NULL;
 513         kfree(hmp, M_HAMMER2);
 514
 515         return (error);
 516 }
 517
 518 static
 519 int
 520 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
 521              ino_t ino, struct vnode **vpp)
 522 {
 523         kprintf("hammer2_vget\n");
 524         return (EOPNOTSUPP);
 525 }
 526
 527 static
 528 int
 529 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
 530 {
 531         hammer2_mount_t *hmp;
 532         int error;
 533         struct vnode *vp;
 534
 535         hmp = MPTOH2(mp);
 536         hammer2_mount_exlock(hmp);
 537         if (hmp->iroot == NULL) {
 538                 *vpp = NULL;
 539                 error = EINVAL;
 540         } else {
 541                 vp = hammer2_igetv(hmp->iroot, &error);
 542                 *vpp = vp;
 543                 if (vp == NULL)
 544                         kprintf("vnodefail\n");
 545         }
 546         hammer2_mount_unlock(hmp);
 547
 548         return (error);
 549 }
 550
 551 static
 552 int
 553 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 554 {
 555         hammer2_mount_t *hmp;
 556
 557         hmp = MPTOH2(mp);
 558
 559         mp->mnt_stat.f_files = 10;
 560         mp->mnt_stat.f_bfree = 10;
 561         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 562
 563         *sbp = mp->mnt_stat;
 564         return (0);
 565 }
 566
 567 static
 568 int
 569 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 570 {
 571         hammer2_mount_t *hmp;
 572
 573         hmp = MPTOH2(mp);
 574
 575         mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
 576         mp->mnt_vstat.f_files = 0;
 577         mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
 578
 579         *sbp = mp->mnt_vstat;
 580         return (0);
 581 }
 582
 583 /*
 584  * Sync the entire filesystem; this is called from the filesystem syncer
 585  * process periodically and whenever a user calls sync(1) on the hammer
 586  * mountpoint.
 587  *
 588  * Currently is actually called from the syncer! \o/
 589  *
 590  * This task will have to snapshot the state of the dirty inode chain.
 591  * From that, it will have to make sure all of the inodes on the dirty
 592  * chain have IO initiated. We make sure that io is initiated for the root
 593  * block.
 594  *
 595  * If waitfor is set, we wait for media to acknowledge the new rootblock.
 596  *
 597  * THINKS: side A vs side B, to have sync not stall all I/O?
 598  */
 599 static
 600 int
 601 hammer2_vfs_sync(struct mount *mp, int waitfor)
 602 {
 603         struct hammer2_sync_info info;
 604         hammer2_mount_t *hmp;
 605         int flags;
 606         int error;
 607         int haswork;
 608
 609         hmp = MPTOH2(mp);
 610
 611         flags = VMSC_GETVP;
 612         if (waitfor & MNT_LAZY)
 613                 flags |= VMSC_ONEPASS;
 614
 615         info.error = 0;
 616         info.waitfor = MNT_NOWAIT;
 617         vmntvnodescan(mp, flags | VMSC_NOWAIT,
 618                       hammer2_sync_scan1,
 619                       hammer2_sync_scan2, &info);
 620         if (info.error == 0 && (waitfor & MNT_WAIT)) {
 621                 info.waitfor = waitfor;
 622                     vmntvnodescan(mp, flags,
 623                                   hammer2_sync_scan1,
 624                                   hammer2_sync_scan2, &info);
 625
 626         }
 627 #if 0
 628         if (waitfor == MNT_WAIT) {
 629                 /* XXX */
 630         } else {
 631                 /* XXX */
 632         }
 633 #endif
 634         hammer2_chain_lock(hmp, &hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
 635         if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
 636                                  HAMMER2_CHAIN_MODIFIED_AUX |
 637                                  HAMMER2_CHAIN_SUBMODIFIED)) {
 638                 hammer2_chain_flush(hmp, &hmp->vchain);
 639                 haswork = 1;
 640         } else {
 641                 haswork = 0;
 642         }
 643         hammer2_chain_unlock(hmp, &hmp->vchain);
 644
 645         error = 0;
 646
 647         if ((waitfor & MNT_LAZY) == 0) {
 648                 waitfor = MNT_NOWAIT;
 649                 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
 650                 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
 651                 vn_unlock(hmp->devvp);
 652         }
 653
 654         if (error == 0 && haswork) {
 655                 struct buf *bp;
 656
 657                 /*
 658                  * Synchronize the disk before flushing the volume
 659                  * header.
 660                  */
 661                 bp = getpbuf(NULL);
 662                 bp->b_bio1.bio_offset = 0;
 663                 bp->b_bufsize = 0;
 664                 bp->b_bcount = 0;
 665                 bp->b_cmd = BUF_CMD_FLUSH;
 666                 bp->b_bio1.bio_done = biodone_sync;
 667                 bp->b_bio1.bio_flags |= BIO_SYNC;
 668                 vn_strategy(hmp->devvp, &bp->b_bio1);
 669                 biowait(&bp->b_bio1, "h2vol");
 670                 relpbuf(bp, NULL);
 671
 672                 /*
 673                  * Then we can safely flush the volume header.  Volume
 674                  * data is locked separately to prevent ioctl functions
 675                  * from deadlocking due to a configuration issue.
 676                  */
 677                 bp = getblk(hmp->devvp, 0, HAMMER2_PBUFSIZE, 0, 0);
 678                 hammer2_voldata_lock(hmp);
 679                 bcopy(&hmp->voldata, bp->b_data, HAMMER2_PBUFSIZE);
 680                 hammer2_voldata_unlock(hmp);
 681                 bawrite(bp);
 682         }
 683         return (error);
 684 }
 685
 686 /*
 687  * Sync passes.
 688  *
 689  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
 690  *       won't flush on those flags.  The syncer code above will do a
 691  *       general meta-data flush globally that will catch these flags.
 692  */
 693 static int
 694 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
 695 {
 696         hammer2_inode_t *ip;
 697
 698         ip = VTOI(vp);
 699         if (vp->v_type == VNON || ip == NULL ||
 700             ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
 701                                  HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
 702              RB_EMPTY(&vp->v_rbdirty_tree))) {
 703                 return(-1);
 704         }
 705         return(0);
 706 }
 707
 708 static int
 709 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
 710 {
 711         struct hammer2_sync_info *info = data;
 712         hammer2_inode_t *ip;
 713         int error;
 714
 715         ip = VTOI(vp);
 716         if (vp->v_type == VNON || vp->v_type == VBAD ||
 717             ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
 718                                  HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
 719             RB_EMPTY(&vp->v_rbdirty_tree))) {
 720                 return(0);
 721         }
 722         error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
 723         if (error)
 724                 info->error = error;
 725         return(0);
 726 }
 727
 728 static
 729 int
 730 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 731 {
 732         return (0);
 733 }
 734
 735 static
 736 int
 737 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 738                struct fid *fhp, struct vnode **vpp)
 739 {
 740         return (0);
 741 }
 742
 743 static
 744 int
 745 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 746                  int *exflagsp, struct ucred **credanonp)
 747 {
 748         return (0);
 749 }
 750
 751 /*
 752  * Support code for hammer2_mount().  Read, verify, and install the volume
 753  * header into the HMP
 754  *
 755  * XXX read four volhdrs and use the one with the highest TID whos CRC
 756  *     matches.
 757  *
 758  * XXX check iCRCs.
 759  *
 760  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
 761  *     nonexistant locations.
 762  *
 763  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
 764  */
 765 static
 766 int
 767 hammer2_install_volume_header(hammer2_mount_t *hmp)
 768 {
 769         hammer2_volume_data_t *vd;
 770         struct buf *bp;
 771         hammer2_crc32_t crc0, crc, bcrc0, bcrc;
 772         int error_reported;
 773         int error;
 774         int valid;
 775         int i;
 776
 777         error_reported = 0;
 778         error = 0;
 779         valid = 0;
 780         bp = NULL;
 781
 782         /*
 783          * There are up to 4 copies of the volume header (syncs iterate
 784          * between them so there is no single master).  We don't trust the
 785          * volu_size field so we don't know precisely how large the filesystem
 786          * is, so depend on the OS to return an error if we go beyond the
 787          * block device's EOF.
 788          */
 789         for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
 790                 error = bread(hmp->devvp, i * HAMMER2_RESERVE_BYTES64,
 791                               HAMMER2_VOLUME_BYTES, &bp);
 792                 if (error) {
 793                         brelse(bp);
 794                         bp = NULL;
 795                         continue;
 796                 }
 797
 798                 vd = (struct hammer2_volume_data *) bp->b_data;
 799                 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
 800                     (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
 801                         brelse(bp);
 802                         bp = NULL;
 803                         continue;
 804                 }
 805
 806                 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
 807                         /* XXX: Reversed-endianness filesystem */
 808                         kprintf("hammer2: reverse-endian filesystem detected");
 809                         brelse(bp);
 810                         bp = NULL;
 811                         continue;
 812                 }
 813
 814                 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
 815                 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
 816                                       HAMMER2_VOLUME_ICRC0_SIZE);
 817                 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
 818                 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
 819                                        HAMMER2_VOLUME_ICRC1_SIZE);
 820                 if ((crc0 != crc) || (bcrc0 != bcrc)) {
 821                         kprintf("hammer2 volume header crc "
 822                                 "mismatch copy #%d\t%08x %08x",
 823                                 i, crc0, crc);
 824                         error_reported = 1;
 825                         brelse(bp);
 826                         bp = NULL;
 827                         continue;
 828                 }
 829                 if (valid == 0 || hmp->voldata.last_tid < vd->last_tid) {
 830                         valid = 1;
 831                         hmp->voldata = *vd;
 832                 }
 833                 brelse(bp);
 834                 bp = NULL;
 835         }
 836         if (valid) {
 837                 error = 0;
 838                 if (error_reported)
 839                         kprintf("hammer2: a valid volume header was found\n");
 840         } else {
 841                 error = EINVAL;
 842                 kprintf("hammer2: no valid volume headers found!\n");
 843         }
 844         return (error);
 845 }
 846