sys/vfs/gnu/ext2fs/ext2_vfsops.c

   1 /*
   2  *  modified for EXT2FS support in Lites 1.1
   3  *
   4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
   5  *  University of Utah, Department of Computer Science
   6  */
   7 /*
   8  * Copyright (c) 1989, 1991, 1993, 1994
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      @(#)ffs_vfsops.c        8.8 (Berkeley) 4/18/94
  40  *      $FreeBSD: src/sys/gnu/ext2fs/ext2_vfsops.c,v 1.63.2.7 2002/07/01 00:18:51 iedowse Exp $
  41  *      $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_vfsops.c,v 1.57 2008/09/17 21:44:21 dillon Exp $
  42  */
  43
  44 #include "opt_quota.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/nlookup.h>
  49 #include <sys/proc.h>
  50 #include <sys/priv.h>
  51 #include <sys/kernel.h>
  52 #include <sys/vnode.h>
  53 #include <sys/mount.h>
  54 #include <sys/buf.h>
  55 #include <sys/conf.h>
  56 #include <sys/fcntl.h>
  57 #include <sys/diskslice.h>
  58 #include <sys/malloc.h>
  59 #include <sys/stat.h>
  60 #include <vm/vm_zone.h>
  61
  62 #include <sys/buf2.h>
  63 #include <sys/thread2.h>
  64
  65 #include "quota.h"
  66 #include "dinode.h"
  67 #include "inode.h"
  68 #include "ext2mount.h"
  69 #include "ext2_extern.h"
  70
  71 #include "fs.h"
  72 #include "ext2_fs.h"
  73 #include "ext2_fs_sb.h"
  74
  75 extern struct vop_ops ext2_vnode_vops;
  76 extern struct vop_ops ext2_spec_vops;
  77 extern struct vop_ops ext2_fifo_vops;
  78
  79 static int ext2_fhtovp (struct mount *, struct vnode *,
  80                                 struct fid *, struct vnode **);
  81 static int ext2_flushfiles (struct mount *mp, int flags);
  82 static int ext2_mount (struct mount *, char *, caddr_t, struct ucred *);
  83 static int ext2_mountfs (struct vnode *, struct mount *, struct ucred *);
  84 static int ext2_root(struct mount *, struct vnode **);
  85 static int ext2_reload (struct mount *mountp, struct ucred *cred);
  86 static int ext2_sbupdate (struct ext2mount *, int);
  87 static int ext2_statfs (struct mount *, struct statfs *, struct ucred *);
  88 static int ext2_sync (struct mount *, int);
  89 static int ext2_unmount (struct mount *, int);
  90 static int ext2_vget (struct mount *, struct vnode *, ino_t, struct vnode **);
  91 static int ext2_init(struct vfsconf *);
  92 static int ext2_vptofh (struct vnode *, struct fid *);
  93
  94 static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
  95 MALLOC_DEFINE(M_EXT2MNT, "EXT2 mount", "EXT2 mount structure");
  96
  97 static struct vfsops ext2fs_vfsops = {
  98         .vfs_mount =            ext2_mount,
  99         .vfs_unmount =          ext2_unmount,
 100         .vfs_root =             ext2_root,      /* root inode via vget */
 101         .vfs_quotactl =         ext2_quotactl,  /* quota operations */
 102         .vfs_statfs =           ext2_statfs,
 103         .vfs_sync =             ext2_sync,
 104         .vfs_vget =             ext2_vget,
 105         .vfs_fhtovp =           ext2_fhtovp,
 106         .vfs_checkexp =         ext2_check_export,
 107         .vfs_vptofh =           ext2_vptofh,
 108         .vfs_init =             ext2_init,
 109         .vfs_uninit =           ext2_uninit
 110 };
 111
 112 VFS_SET(ext2fs_vfsops, ext2fs, 0);
 113 #define bsd_malloc kmalloc
 114 #define bsd_free kfree
 115
 116 static int ext2fs_inode_hash_lock;
 117
 118 static int      ext2_check_sb_compat (struct ext2_super_block *es,
 119                                           cdev_t dev, int ronly);
 120 static int      compute_sb_data (struct vnode * devvp,
 121                                      struct ext2_super_block * es,
 122                                      struct ext2_sb_info * fs);
 123
 124 static int
 125 ext2_root(struct mount *mp, struct vnode **vpp)
 126 {
 127         struct vnode *nvp;
 128         int error;
 129
 130         error = VFS_VGET(mp, NULL, (ino_t)ROOTINO, &nvp);
 131         if (error)
 132                 return (error);
 133         *vpp = nvp;
 134         return (0);
 135 }
 136
 137 /*
 138  * Do operations associated with quotas
 139  */
 140 int
 141 ext2_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
 142              struct ucred *cred)
 143 {
 144 #ifndef QUOTA
 145         return (EOPNOTSUPP);
 146 #else
 147         int cmd, type, error;
 148
 149         type = cmds & SUBCMDMASK;
 150         cmd = cmds >> SUBCMDSHIFT;
 151
 152         if (uid == -1) {
 153                 switch(type) {
 154                         case USRQUOTA:
 155                                 uid = cred->cr_ruid;
 156                                 break;
 157                         case GRPQUOTA:
 158                                 uid = cred->cr_rgid;
 159                                 break;
 160                         default:
 161                                 return (EINVAL);
 162                 }
 163         }
 164
 165         /*
 166          * Check permissions.
 167          */
 168         switch (cmd) {
 169
 170         case Q_QUOTAON:
 171                 error = priv_check_cred(cred, PRIV_UFS_QUOTAON, 0);
 172                 break;
 173
 174         case Q_QUOTAOFF:
 175                 error = priv_check_cred(cred, PRIV_UFS_QUOTAOFF, 0);
 176                 break;
 177
 178         case Q_SETQUOTA:
 179                 error = priv_check_cred(cred, PRIV_VFS_SETQUOTA, 0);
 180                 break;
 181
 182         case Q_SETUSE:
 183                 error = priv_check_cred(cred, PRIV_UFS_SETUSE, 0);
 184                 break;
 185
 186         case Q_GETQUOTA:
 187                 if (uid == cred->cr_ruid)
 188                         error = 0;
 189                 else
 190                         error = priv_check_cred(cred, PRIV_VFS_GETQUOTA, 0);
 191                 break;
 192
 193         case Q_SYNC:
 194                 error = 0;
 195                 break;
 196
 197         default:
 198                 error = EINVAL;
 199                 break;
 200         }
 201
 202         if (error)
 203                 return (error);
 204
 205
 206         if ((uint)type >= MAXQUOTAS)
 207                 return (EINVAL);
 208         if (vfs_busy(mp, LK_NOWAIT))
 209                 return (0);
 210
 211         switch (cmd) {
 212
 213         case Q_QUOTAON:
 214                 error = ext2_quotaon(cred, mp, type, arg);
 215                 break;
 216
 217         case Q_QUOTAOFF:
 218                 error = ext2_quotaoff(mp, type);
 219                 break;
 220
 221         case Q_SETQUOTA:
 222                 error = ext2_setquota(mp, uid, type, arg);
 223                 break;
 224
 225         case Q_SETUSE:
 226                 error = ext2_setuse(mp, uid, type, arg);
 227                 break;
 228
 229         case Q_GETQUOTA:
 230                 error = ext2_getquota(mp, uid, type, arg);
 231                 break;
 232
 233         case Q_SYNC:
 234                 error = ext2_qsync(mp);
 235                 break;
 236
 237         default:
 238                 error = EINVAL;
 239                 break;
 240         }
 241         vfs_unbusy(mp);
 242         return (error);
 243 #endif
 244 }
 245
 246 /*
 247  * Initial UFS filesystems, done only once.
 248  */
 249 int
 250 ext2_init(struct vfsconf *vfsp)
 251 {
 252         static int done;
 253
 254         if (done)
 255                 return (0);
 256         done = 1;
 257         ext2_ihashinit();
 258 #ifdef QUOTA
 259         ext2_dqinit();
 260 #endif
 261         return (0);
 262 }
 263
 264 /*
 265  * VFS Operations.
 266  *
 267  * mount system call
 268  *
 269  * Parameters:
 270  *      data:   this is actually a (struct ext2_args *)
 271  */
 272 static int
 273 ext2_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 274 {
 275         struct vnode *devvp;
 276         struct ext2_args args;
 277         struct ext2mount *ump = 0;
 278         struct ext2_sb_info *fs;
 279         size_t size;
 280         int error, flags;
 281         mode_t accessmode;
 282         struct nlookupdata nd;
 283
 284         if ((error = copyin(data, (caddr_t)&args, sizeof (struct ext2_args))) != 0)
 285                 return (error);
 286
 287         /*
 288          * If updating, check whether changing from read-only to
 289          * read/write; if there is no device name, that's all we do.
 290          */
 291         if (mp->mnt_flag & MNT_UPDATE) {
 292                 ump = VFSTOEXT2(mp);
 293                 fs = ump->um_e2fs;
 294                 devvp = ump->um_devvp;
 295                 error = 0;
 296                 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 297                         flags = WRITECLOSE;
 298                         if (mp->mnt_flag & MNT_FORCE)
 299                                 flags |= FORCECLOSE;
 300                         if (vfs_busy(mp, LK_NOWAIT))
 301                                 return (EBUSY);
 302                         error = ext2_flushfiles(mp, flags);
 303                         vfs_unbusy(mp);
 304                         if (!error && fs->s_wasvalid) {
 305                                 fs->s_es->s_state |= EXT2_VALID_FS;
 306                                 ext2_sbupdate(ump, MNT_WAIT);
 307                         }
 308                         fs->s_rd_only = 1;
 309                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 310                         VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 311                         VOP_CLOSE(devvp, FREAD|FWRITE);
 312                         vn_unlock(devvp);
 313                 }
 314                 if (!error && (mp->mnt_flag & MNT_RELOAD))
 315                         error = ext2_reload(mp, cred);
 316                 if (error)
 317                         return (error);
 318                 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
 319                     (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
 320                         return (EPERM);
 321                 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 322                         /*
 323                          * If upgrade to read-write by non-root, then verify
 324                          * that user has necessary permissions on the device.
 325                          */
 326                         if (cred->cr_uid != 0) {
 327                                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 328                                 error = VOP_EACCESS(devvp, VREAD | VWRITE, cred);
 329                                 if (error) {
 330                                         vn_unlock(devvp);
 331                                         return (error);
 332                                 }
 333                                 vn_unlock(devvp);
 334                         }
 335
 336                         if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
 337                             (fs->s_es->s_state & EXT2_ERROR_FS)) {
 338                                 if (mp->mnt_flag & MNT_FORCE) {
 339                                         kprintf(
 340 "WARNING: %s was not properly dismounted\n",
 341                                             fs->fs_fsmnt);
 342                                 } else {
 343                                         kprintf(
 344 "WARNING: R/W mount of %s denied.  Filesystem is not clean - run fsck\n",
 345                                             fs->fs_fsmnt);
 346                                         return (EPERM);
 347                                 }
 348                         }
 349                         fs->s_es->s_state &= ~EXT2_VALID_FS;
 350                         ext2_sbupdate(ump, MNT_WAIT);
 351                         fs->s_rd_only = 0;
 352                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 353                         VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
 354                         VOP_CLOSE(devvp, FREAD);
 355                         vn_unlock(devvp);
 356                 }
 357                 if (args.fspec == 0) {
 358                         /*
 359                          * Process export requests.
 360                          */
 361                         return (vfs_export(mp, &ump->um_export, &args.export));
 362                 }
 363         }
 364         /*
 365          * Not an update, or updating the name: look up the name
 366          * and verify that it refers to a sensible block device.
 367          */
 368         devvp = NULL;
 369         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 370         if (error == 0)
 371                 error = nlookup(&nd);
 372         if (error == 0)
 373                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 374         nlookup_done(&nd);
 375         if (error)
 376                 return (error);
 377
 378         if (!vn_isdisk(devvp, &error)) {
 379                 vrele(devvp);
 380                 return (error);
 381         }
 382
 383         /*
 384          * If mount by non-root, then verify that user has necessary
 385          * permissions on the device.
 386          */
 387         if (cred->cr_uid != 0) {
 388                 accessmode = VREAD;
 389                 if ((mp->mnt_flag & MNT_RDONLY) == 0)
 390                         accessmode |= VWRITE;
 391                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 392                 if ((error = VOP_EACCESS(devvp, accessmode, cred)) != 0) {
 393                         vput(devvp);
 394                         return (error);
 395                 }
 396                 vn_unlock(devvp);
 397         }
 398
 399         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 400                 error = ext2_mountfs(devvp, mp, cred);
 401         } else {
 402                 if (devvp != ump->um_devvp)
 403                         error = EINVAL; /* needs translation */
 404                 else
 405                         vrele(devvp);
 406         }
 407         if (error) {
 408                 vrele(devvp);
 409                 return (error);
 410         }
 411         ump = VFSTOEXT2(mp);
 412         fs = ump->um_e2fs;
 413         copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
 414         bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
 415         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 416         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 417         ext2_statfs(mp, &mp->mnt_stat, cred);
 418         return (0);
 419 }
 420
 421 /*
 422  * checks that the data in the descriptor blocks make sense
 423  * this is taken from ext2/super.c
 424  */
 425 static int
 426 ext2_check_descriptors(struct ext2_sb_info *sb)
 427 {
 428         int i;
 429         int desc_block = 0;
 430         unsigned long block = sb->s_es->s_first_data_block;
 431         struct ext2_group_desc * gdp = NULL;
 432
 433         /* ext2_debug ("Checking group descriptors"); */
 434
 435         for (i = 0; i < sb->s_groups_count; i++)
 436         {
 437                 /* examine next descriptor block */
 438                 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
 439                         gdp = (struct ext2_group_desc *)
 440                                 sb->s_group_desc[desc_block++]->b_data;
 441                 if (gdp->bg_block_bitmap < block ||
 442                     gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
 443                 {
 444                         kprintf ("ext2_check_descriptors: "
 445                                     "Block bitmap for group %d"
 446                                     " not in group (block %lu)!\n",
 447                                     i, (unsigned long) gdp->bg_block_bitmap);
 448                         return 0;
 449                 }
 450                 if (gdp->bg_inode_bitmap < block ||
 451                     gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
 452                 {
 453                         kprintf ("ext2_check_descriptors: "
 454                                     "Inode bitmap for group %d"
 455                                     " not in group (block %lu)!\n",
 456                                     i, (unsigned long) gdp->bg_inode_bitmap);
 457                         return 0;
 458                 }
 459                 if (gdp->bg_inode_table < block ||
 460                     gdp->bg_inode_table + sb->s_itb_per_group >=
 461                     block + EXT2_BLOCKS_PER_GROUP(sb))
 462                 {
 463                         kprintf ("ext2_check_descriptors: "
 464                                     "Inode table for group %d"
 465                                     " not in group (block %lu)!\n",
 466                                     i, (unsigned long) gdp->bg_inode_table);
 467                         return 0;
 468                 }
 469                 block += EXT2_BLOCKS_PER_GROUP(sb);
 470                 gdp++;
 471         }
 472         return 1;
 473 }
 474
 475 static int
 476 ext2_check_sb_compat(struct ext2_super_block *es, cdev_t dev, int ronly)
 477 {
 478         if (es->s_magic != EXT2_SUPER_MAGIC) {
 479                 kprintf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
 480                     devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
 481                 return (1);
 482         }
 483         if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
 484                 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
 485                         kprintf(
 486 "WARNING: mount of %s denied due to unsupported optional features\n",
 487                             devtoname(dev));
 488                         return (1);
 489                 }
 490                 if (!ronly &&
 491                     (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
 492                         kprintf(
 493 "WARNING: R/W mount of %s denied due to unsupported optional features\n",
 494                             devtoname(dev));
 495                         return (1);
 496                 }
 497         }
 498         return (0);
 499 }
 500
 501 /*
 502  * this computes the fields of the  ext2_sb_info structure from the
 503  * data in the ext2_super_block structure read in
 504  */
 505 static int
 506 compute_sb_data(struct vnode *devvp, struct ext2_super_block *es,
 507                 struct ext2_sb_info *fs)
 508 {
 509     int db_count, error;
 510     int i, j;
 511     int logic_sb_block = 1;     /* XXX for now */
 512
 513 #if 1
 514 #define V(v)
 515 #else
 516 #define V(v)  kprintf(#v"= %d\n", fs->v);
 517 #endif
 518
 519     fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
 520     V(s_blocksize)
 521     fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
 522     V(s_bshift)
 523     fs->s_fsbtodb = es->s_log_block_size + 1;
 524     V(s_fsbtodb)
 525     fs->s_qbmask = fs->s_blocksize - 1;
 526     V(s_bmask)
 527     fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
 528     V(s_blocksize_bits)
 529     fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
 530     V(s_frag_size)
 531     if (fs->s_frag_size)
 532         fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
 533     V(s_frags_per_block)
 534     fs->s_blocks_per_group = es->s_blocks_per_group;
 535     V(s_blocks_per_group)
 536     fs->s_frags_per_group = es->s_frags_per_group;
 537     V(s_frags_per_group)
 538     fs->s_inodes_per_group = es->s_inodes_per_group;
 539     V(s_inodes_per_group)
 540     if (es->s_rev_level == EXT2_GOOD_OLD_REV) {
 541         fs->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
 542         fs->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
 543     } else {
 544         fs->s_first_ino = es->s_first_ino;
 545         fs->s_inode_size = es->s_inode_size;
 546         /*
 547          * Simple sanity check for superblock inode size value.
 548          */
 549         if (fs->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE ||
 550             fs->s_inode_size > fs->s_blocksize ||
 551             (fs->s_inode_size & (fs->s_inode_size - 1)) != 0) {
 552             kprintf("EXT2-fs: invalid inode size %d\n",
 553                 fs->s_inode_size);
 554             return (EIO);
 555         }
 556     }
 557     V(s_first_ino)
 558     V(s_inode_size)
 559     fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE(fs);
 560     V(s_inodes_per_block)
 561     fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
 562     V(s_itb_per_group)
 563     fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
 564     V(s_desc_per_block)
 565     /* s_resuid / s_resgid ? */
 566     fs->s_groups_count = (es->s_blocks_count -
 567                           es->s_first_data_block +
 568                           EXT2_BLOCKS_PER_GROUP(fs) - 1) /
 569                          EXT2_BLOCKS_PER_GROUP(fs);
 570     V(s_groups_count)
 571     db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
 572         EXT2_DESC_PER_BLOCK(fs);
 573     fs->s_db_per_group = db_count;
 574     V(s_db_per_group)
 575
 576     fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
 577                 M_EXT2MNT, M_WAITOK);
 578
 579     /* adjust logic_sb_block */
 580     if(fs->s_blocksize > SBSIZE)
 581         /* Godmar thinks: if the blocksize is greater than 1024, then
 582            the superblock is logically part of block zero.
 583          */
 584         logic_sb_block = 0;
 585
 586     for (i = 0; i < db_count; i++) {
 587         error = bread(devvp, fsbtodoff(fs, logic_sb_block + i + 1),
 588                       fs->s_blocksize, &fs->s_group_desc[i]);
 589         if(error) {
 590             for (j = 0; j < i; j++)
 591                 brelse(fs->s_group_desc[j]);
 592             bsd_free(fs->s_group_desc, M_EXT2MNT);
 593             kprintf("EXT2-fs: unable to read group descriptors (%d)\n", error);
 594             return EIO;
 595         }
 596         /* Set the B_LOCKED flag on the buffer, then brelse() it */
 597         LCK_BUF(fs->s_group_desc[i])
 598     }
 599     if(!ext2_check_descriptors(fs)) {
 600             for (j = 0; j < db_count; j++)
 601                     ULCK_BUF(fs->s_group_desc[j])
 602             bsd_free(fs->s_group_desc, M_EXT2MNT);
 603             kprintf("EXT2-fs: (ext2_check_descriptors failure) "
 604                    "unable to read group descriptors\n");
 605             return EIO;
 606     }
 607
 608     for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
 609             fs->s_inode_bitmap_number[i] = 0;
 610             fs->s_inode_bitmap[i] = NULL;
 611             fs->s_block_bitmap_number[i] = 0;
 612             fs->s_block_bitmap[i] = NULL;
 613     }
 614     fs->s_loaded_inode_bitmaps = 0;
 615     fs->s_loaded_block_bitmaps = 0;
 616     return 0;
 617 }
 618
 619 /*
 620  * Reload all incore data for a filesystem (used after running fsck on
 621  * the root filesystem and finding things to fix). The filesystem must
 622  * be mounted read-only.
 623  *
 624  * Things to do to update the mount:
 625  *      1) invalidate all cached meta-data.
 626  *      2) re-read superblock from disk.
 627  *      3) re-read summary information from disk.
 628  *      4) invalidate all inactive vnodes.
 629  *      5) invalidate all cached file data.
 630  *      6) re-read inode data for all active vnodes.
 631  */
 632 static int ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *rescan);
 633 static int ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *rescan);
 634
 635 struct scaninfo {
 636         int rescan;
 637         int allerror;
 638         int waitfor;
 639         struct vnode *devvp;
 640         struct ext2_sb_info *fs;
 641 };
 642
 643 static int
 644 ext2_reload(struct mount *mountp, struct ucred *cred)
 645 {
 646         struct vnode *devvp;
 647         struct buf *bp;
 648         struct ext2_super_block * es;
 649         struct ext2_sb_info *fs;
 650         int error;
 651         struct scaninfo scaninfo;
 652
 653         if ((mountp->mnt_flag & MNT_RDONLY) == 0)
 654                 return (EINVAL);
 655         /*
 656          * Step 1: invalidate all cached meta-data.
 657          */
 658         devvp = VFSTOEXT2(mountp)->um_devvp;
 659         if (vinvalbuf(devvp, 0, 0, 0))
 660                 panic("ext2_reload: dirty1");
 661         /*
 662          * Step 2: re-read superblock from disk.
 663          * constants have been adjusted for ext2
 664          */
 665         if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
 666                 return (error);
 667         es = (struct ext2_super_block *)bp->b_data;
 668         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
 669                 brelse(bp);
 670                 return (EIO);           /* XXX needs translation */
 671         }
 672         fs = VFSTOEXT2(mountp)->um_e2fs;
 673         bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
 674
 675         if((error = compute_sb_data(devvp, es, fs)) != 0) {
 676                 brelse(bp);
 677                 return error;
 678         }
 679 #ifdef UNKLAR
 680         if (fs->fs_sbsize < SBSIZE)
 681                 bp->b_flags |= B_INVAL;
 682 #endif
 683         brelse(bp);
 684
 685         scaninfo.rescan = 1;
 686         scaninfo.devvp = devvp;
 687         scaninfo.fs = fs;
 688         while (error == 0 && scaninfo.rescan) {
 689             scaninfo.rescan = 0;
 690             error = vmntvnodescan(mountp, VMSC_GETVX, ext2_reload_scan1,
 691                                 ext2_reload_scan2, &scaninfo);
 692         }
 693         return(error);
 694 }
 695
 696 static int
 697 ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *data)
 698 {
 699         /*struct scaninfo *info = data;*/
 700
 701         return(0);
 702 }
 703
 704 static int
 705 ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *data)
 706 {
 707         struct scaninfo *info = data;
 708         struct inode *ip;
 709         struct buf *bp;
 710         int error;
 711
 712         /*
 713          * Try to recycle
 714          */
 715         if (vrecycle(vp))
 716                 return(0);
 717
 718         /*
 719          * Step 5: invalidate all cached file data.
 720          */
 721         if (vinvalbuf(vp, 0, 0, 0))
 722                 panic("ext2_reload: dirty2");
 723         /*
 724          * Step 6: re-read inode data for all active vnodes.
 725          */
 726         ip = VTOI(vp);
 727         error = bread(info->devvp,
 728                       fsbtodoff(info->fs, ino_to_fsba(info->fs, ip->i_number)),
 729                       (int)info->fs->s_blocksize, &bp);
 730         if (error)
 731                 return (error);
 732         ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
 733             EXT2_INODE_SIZE(info->fs) * ino_to_fsbo(info->fs, ip->i_number)),
 734             &ip->i_din);
 735         brelse(bp);
 736         return(0);
 737 }
 738
 739 /*
 740  * Common code for mount and mountroot
 741  */
 742 static int
 743 ext2_mountfs(struct vnode *devvp, struct mount *mp, struct ucred *cred)
 744 {
 745         struct ext2mount *ump;
 746         struct buf *bp;
 747         struct ext2_sb_info *fs;
 748         struct ext2_super_block * es;
 749         cdev_t dev;
 750         struct partinfo dpart;
 751         int error, i, size;
 752         int ronly;
 753
 754         /*
 755          * Disallow multiple mounts of the same device.
 756          * Disallow mounting of a device that is currently in use
 757          * (except for root, which might share swap device for miniroot).
 758          * Flush out any old buffers remaining from a previous use.
 759          */
 760         if ((error = vfs_mountedon(devvp)) != 0)
 761                 return (error);
 762         if (vcount(devvp) > 0)
 763                 return (EBUSY);
 764         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)) != 0)
 765                 return (error);
 766 #ifdef READONLY
 767 /* turn on this to force it to be read-only */
 768         mp->mnt_flag |= MNT_RDONLY;
 769 #endif
 770
 771         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
 772         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 773         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
 774         vn_unlock(devvp);
 775         if (error)
 776                 return (error);
 777         dev = devvp->v_rdev;
 778         if (dev->si_iosize_max != 0)
 779                 mp->mnt_iosize_max = dev->si_iosize_max;
 780         if (mp->mnt_iosize_max > MAXPHYS)
 781                 mp->mnt_iosize_max = MAXPHYS;
 782         if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD,
 783                       cred, NULL) != 0) {
 784                 size = DEV_BSIZE;
 785         } else {
 786                 size = dpart.media_blksize;
 787         }
 788
 789         bp = NULL;
 790         ump = NULL;
 791         if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
 792                 goto out;
 793         es = (struct ext2_super_block *)bp->b_data;
 794         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
 795                 error = EINVAL;         /* XXX needs translation */
 796                 goto out;
 797         }
 798         if ((es->s_state & EXT2_VALID_FS) == 0 ||
 799             (es->s_state & EXT2_ERROR_FS)) {
 800                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
 801                         kprintf(
 802 "WARNING: Filesystem was not properly dismounted\n");
 803                 } else {
 804                         kprintf(
 805 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
 806                         error = EPERM;
 807                         goto out;
 808                 }
 809         }
 810         ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK | M_ZERO);
 811         ump->um_malloctype = M_EXT2NODE;
 812         ump->um_blkatoff = ext2_blkatoff;
 813         ump->um_truncate = ext2_truncate;
 814         ump->um_update = ext2_update;
 815         ump->um_valloc = ext2_valloc;
 816         ump->um_vfree = ext2_vfree;
 817         /* I don't know whether this is the right strategy. Note that
 818            we dynamically allocate both a ext2_sb_info and a ext2_super_block
 819            while Linux keeps the super block in a locked buffer
 820          */
 821         ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
 822                 M_EXT2MNT, M_WAITOK);
 823         ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
 824                 M_EXT2MNT, M_WAITOK);
 825         bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
 826         if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
 827                 goto out;
 828         /*
 829          * We don't free the group descriptors allocated by compute_sb_data()
 830          * until ext2_unmount().  This is OK since the mount will succeed.
 831          */
 832         brelse(bp);
 833         bp = NULL;
 834         fs = ump->um_e2fs;
 835         fs->s_rd_only = ronly;  /* ronly is set according to mnt_flags */
 836         /* if the fs is not mounted read-only, make sure the super block is
 837            always written back on a sync()
 838          */
 839         fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
 840         if (ronly == 0) {
 841                 fs->s_dirt = 1;         /* mark it modified */
 842                 fs->s_es->s_state &= ~EXT2_VALID_FS;    /* set fs invalid */
 843         }
 844         mp->mnt_data = (qaddr_t)ump;
 845         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 846         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 847         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
 848         mp->mnt_flag |= MNT_LOCAL;
 849         ump->um_mountp = mp;
 850         ump->um_dev = dev;
 851         ump->um_devvp = devvp;
 852         /* setting those two parameters allows us to use
 853            ext2_bmap w/o changse !
 854         */
 855         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
 856         ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
 857         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
 858         for (i = 0; i < MAXQUOTAS; i++)
 859                 ump->um_quotas[i] = NULLVP;
 860         dev->si_mountpoint = mp;
 861
 862         vfs_add_vnodeops(mp, &ext2_vnode_vops, &mp->mnt_vn_norm_ops);
 863         vfs_add_vnodeops(mp, &ext2_spec_vops, &mp->mnt_vn_spec_ops);
 864         vfs_add_vnodeops(mp, &ext2_fifo_vops, &mp->mnt_vn_fifo_ops);
 865
 866         if (ronly == 0)
 867                 ext2_sbupdate(ump, MNT_WAIT);
 868         return (0);
 869 out:
 870         if (bp)
 871                 brelse(bp);
 872         VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE);
 873         if (ump) {
 874                 bsd_free(ump->um_e2fs->s_es, M_EXT2MNT);
 875                 bsd_free(ump->um_e2fs, M_EXT2MNT);
 876                 bsd_free(ump, M_EXT2MNT);
 877                 mp->mnt_data = (qaddr_t)0;
 878         }
 879         return (error);
 880 }
 881
 882 /*
 883  * unmount system call
 884  */
 885 static int
 886 ext2_unmount(struct mount *mp, int mntflags)
 887 {
 888         struct ext2mount *ump;
 889         struct ext2_sb_info *fs;
 890         int error, flags, ronly, i;
 891
 892         flags = 0;
 893         if (mntflags & MNT_FORCE) {
 894                 if (mp->mnt_flag & MNT_ROOTFS)
 895                         return (EINVAL);
 896                 flags |= FORCECLOSE;
 897         }
 898         if ((error = ext2_flushfiles(mp, flags)) != 0)
 899                 return (error);
 900         ump = VFSTOEXT2(mp);
 901         fs = ump->um_e2fs;
 902         ronly = fs->s_rd_only;
 903         if (ronly == 0) {
 904                 if (fs->s_wasvalid)
 905                         fs->s_es->s_state |= EXT2_VALID_FS;
 906                 ext2_sbupdate(ump, MNT_WAIT);
 907         }
 908
 909         /* release buffers containing group descriptors */
 910         for(i = 0; i < fs->s_db_per_group; i++)
 911                 ULCK_BUF(fs->s_group_desc[i])
 912         bsd_free(fs->s_group_desc, M_EXT2MNT);
 913
 914         /* release cached inode/block bitmaps */
 915         for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
 916                 if (fs->s_inode_bitmap[i])
 917                         ULCK_BUF(fs->s_inode_bitmap[i])
 918
 919         for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
 920                 if (fs->s_block_bitmap[i])
 921                         ULCK_BUF(fs->s_block_bitmap[i])
 922
 923         ump->um_devvp->v_rdev->si_mountpoint = NULL;
 924         error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE);
 925         vrele(ump->um_devvp);
 926         bsd_free(fs->s_es, M_EXT2MNT);
 927         bsd_free(fs, M_EXT2MNT);
 928         bsd_free(ump, M_EXT2MNT);
 929         mp->mnt_data = (qaddr_t)0;
 930         mp->mnt_flag &= ~MNT_LOCAL;
 931         return (error);
 932 }
 933
 934 /*
 935  * Flush out all the files in a filesystem.
 936  */
 937 static int
 938 ext2_flushfiles(struct mount *mp, int flags)
 939 {
 940         struct ext2mount *ump;
 941         int error;
 942 #if QUOTA
 943         int i;
 944 #endif
 945
 946         ump = VFSTOEXT2(mp);
 947 #if QUOTA
 948         if (mp->mnt_flag & MNT_QUOTA) {
 949                 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
 950                         return (error);
 951                 for (i = 0; i < MAXQUOTAS; i++) {
 952                         if (ump->um_quotas[i] == NULLVP)
 953                                 continue;
 954                         ext2_quotaoff(mp, i);
 955                 }
 956                 /*
 957                  * Here we fall through to vflush again to ensure
 958                  * that we have gotten rid of all the system vnodes.
 959                  */
 960         }
 961 #endif
 962         error = vflush(mp, 0, flags);
 963         return (error);
 964 }
 965
 966 /*
 967  * Get file system statistics.
 968  * taken from ext2/super.c ext2_statfs
 969  */
 970 static int
 971 ext2_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 972 {
 973         unsigned long overhead;
 974         struct ext2mount *ump;
 975         struct ext2_sb_info *fs;
 976         struct ext2_super_block *es;
 977         int i, nsb;
 978
 979         ump = VFSTOEXT2(mp);
 980         fs = ump->um_e2fs;
 981         es = fs->s_es;
 982
 983         if (es->s_magic != EXT2_SUPER_MAGIC)
 984                 panic("ext2_statfs - magic number spoiled");
 985
 986         /*
 987          * Compute the overhead (FS structures)
 988          */
 989         if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
 990                 nsb = 0;
 991                 for (i = 0 ; i < fs->s_groups_count; i++)
 992                         if (ext2_group_sparse(i))
 993                                 nsb++;
 994         } else
 995                 nsb = fs->s_groups_count;
 996         overhead = es->s_first_data_block +
 997             /* Superblocks and block group descriptors: */
 998             nsb * (1 + fs->s_db_per_group) +
 999             /* Inode bitmap, block bitmap, and inode table: */
1000             fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
1001
1002         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
1003         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
1004         sbp->f_blocks = es->s_blocks_count - overhead;
1005         sbp->f_bfree = es->s_free_blocks_count;
1006         sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
1007         sbp->f_files = es->s_inodes_count;
1008         sbp->f_ffree = es->s_free_inodes_count;
1009         if (sbp != &mp->mnt_stat) {
1010                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
1011                 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
1012                         (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
1013         }
1014         return (0);
1015 }
1016
1017 /*
1018  * Go through the disk queues to initiate sandbagged IO;
1019  * go through the inodes to write those that have been modified;
1020  * initiate the writing of the super block if it has been modified.
1021  *
1022  * Note: we are always called with the filesystem marked `MPBUSY'.
1023  */
1024
1025 static int ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data);
1026
1027 static int
1028 ext2_sync(struct mount *mp, int waitfor)
1029 {
1030         struct ext2mount *ump = VFSTOEXT2(mp);
1031         struct ext2_sb_info *fs;
1032         struct scaninfo scaninfo;
1033         int error;
1034
1035         fs = ump->um_e2fs;
1036         if (fs->s_dirt != 0 && fs->s_rd_only != 0) {            /* XXX */
1037                 kprintf("fs = %s\n", fs->fs_fsmnt);
1038                 panic("ext2_sync: rofs mod");
1039         }
1040
1041         /*
1042          * Write back each (modified) inode.
1043          */
1044         scaninfo.allerror = 0;
1045         scaninfo.rescan = 1;
1046         scaninfo.waitfor = waitfor;
1047         while (scaninfo.rescan) {
1048                 scaninfo.rescan = 0;
1049                 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
1050                                 NULL, ext2_sync_scan, &scaninfo);
1051         }
1052
1053         /*
1054          * Force stale file system control information to be flushed.
1055          */
1056         if (waitfor != MNT_LAZY) {
1057                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1058                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, 0)) != 0)
1059                         scaninfo.allerror = error;
1060                 vn_unlock(ump->um_devvp);
1061         }
1062 #if QUOTA
1063         ext2_qsync(mp);
1064 #endif
1065         /*
1066          * Write back modified superblock.
1067          */
1068         if (fs->s_dirt != 0) {
1069                 fs->s_dirt = 0;
1070                 fs->s_es->s_wtime = time_second;
1071                 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
1072                         scaninfo.allerror = error;
1073         }
1074         return (scaninfo.allerror);
1075 }
1076
1077 static int
1078 ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data)
1079 {
1080         struct scaninfo *info = data;
1081         struct inode *ip;
1082         int error;
1083
1084         ip = VTOI(vp);
1085         if (vp->v_type == VNON ||
1086             ((ip->i_flag &
1087             (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1088             (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) {
1089                 return(0);
1090         }
1091         if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0)
1092                 info->allerror = error;
1093         return(0);
1094 }
1095
1096 /*
1097  * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
1098  * in from disk.  If it is in core, wait for the lock bit to clear, then
1099  * return the inode locked.  Detection and handling of mount points must be
1100  * done by the calling routine.
1101  */
1102 static int
1103 ext2_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
1104 {
1105         struct ext2_sb_info *fs;
1106         struct inode *ip;
1107         struct ext2mount *ump;
1108         struct buf *bp;
1109         struct vnode *vp;
1110         cdev_t dev;
1111         int i, error;
1112         int used_blocks;
1113
1114         ump = VFSTOEXT2(mp);
1115         dev = ump->um_dev;
1116 restart:
1117         if ((*vpp = ext2_ihashget(dev, ino)) != NULL)
1118                 return (0);
1119
1120         /*
1121          * Lock out the creation of new entries in the FFS hash table in
1122          * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1123          * may occur!
1124          */
1125         if (ext2fs_inode_hash_lock) {
1126                 while (ext2fs_inode_hash_lock) {
1127                         ext2fs_inode_hash_lock = -1;
1128                         tsleep(&ext2fs_inode_hash_lock, 0, "e2vget", 0);
1129                 }
1130                 goto restart;
1131         }
1132         ext2fs_inode_hash_lock = 1;
1133
1134         /*
1135          * If this MALLOC() is performed after the getnewvnode()
1136          * it might block, leaving a vnode with a NULL v_data to be
1137          * found by ext2_sync() if a sync happens to fire right then,
1138          * which will cause a panic because ext2_sync() blindly
1139          * dereferences vp->v_data (as well it should).
1140          */
1141         MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
1142
1143         /* Allocate a new vnode/inode. */
1144         if ((error = getnewvnode(VT_EXT2FS, mp, &vp, 0, LK_CANRECURSE)) != 0) {
1145                 if (ext2fs_inode_hash_lock < 0)
1146                         wakeup(&ext2fs_inode_hash_lock);
1147                 ext2fs_inode_hash_lock = 0;
1148                 *vpp = NULL;
1149                 FREE(ip, M_EXT2NODE);
1150                 return (error);
1151         }
1152         bzero((caddr_t)ip, sizeof(struct inode));
1153         vp->v_data = ip;
1154         ip->i_vnode = vp;
1155         ip->i_e2fs = fs = ump->um_e2fs;
1156         ip->i_dev = dev;
1157         ip->i_number = ino;
1158 #if QUOTA
1159         for (i = 0; i < MAXQUOTAS; i++)
1160                 ip->i_dquot[i] = NODQUOT;
1161 #endif
1162         /*
1163          * Put it onto its hash chain.  Since our vnode is locked, other
1164          * requests for this inode will block if they arrive while we are
1165          * sleeping waiting for old data structures to be purged or for the
1166          * contents of the disk portion of this inode to be read.
1167          */
1168         ext2_ihashins(ip);
1169
1170         if (ext2fs_inode_hash_lock < 0)
1171                 wakeup(&ext2fs_inode_hash_lock);
1172         ext2fs_inode_hash_lock = 0;
1173
1174         /* Read in the disk contents for the inode, copy into the inode. */
1175 #if 0
1176 kprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1177 #endif
1178         error = bread(ump->um_devvp, fsbtodoff(fs, ino_to_fsba(fs, ino)),
1179                       (int)fs->s_blocksize, &bp);
1180         if (error) {
1181                 /*
1182                  * The inode does not contain anything useful, so it would
1183                  * be misleading to leave it on its hash chain. With mode
1184                  * still zero, it will be unlinked and returned to the free
1185                  * list by vput().
1186                  */
1187                 vx_put(vp);
1188                 brelse(bp);
1189                 *vpp = NULL;
1190                 return (error);
1191         }
1192         /* convert ext2 inode to dinode */
1193         ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
1194                         ino_to_fsbo(fs, ino)), &ip->i_din);
1195         ip->i_block_group = ino_to_cg(fs, ino);
1196         ip->i_next_alloc_block = 0;
1197         ip->i_next_alloc_goal = 0;
1198         ip->i_prealloc_count = 0;
1199         ip->i_prealloc_block = 0;
1200         /* now we want to make sure that block pointers for unused
1201            blocks are zeroed out - ext2_balloc depends on this
1202            although for regular files and directories only
1203         */
1204         if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1205                 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1206                 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1207                         ip->i_db[i] = 0;
1208         }
1209 #if 0
1210         ext2_print_inode(ip);
1211 #endif
1212         brelse(bp);
1213
1214         /*
1215          * Initialize the vnode from the inode, check for aliases.
1216          * Note that the underlying vnode may have changed.
1217          */
1218         if ((error = ext2_vinit(mp, &vp)) != 0) {
1219                 vx_put(vp);
1220                 *vpp = NULL;
1221                 return (error);
1222         }
1223
1224         /*
1225          * Finish inode initialization now that aliasing has been resolved.
1226          */
1227         ip->i_devvp = ump->um_devvp;
1228         vref(ip->i_devvp);
1229         /*
1230          * Set up a generation number for this inode if it does not
1231          * already have one. This should only happen on old filesystems.
1232          */
1233         if (ip->i_gen == 0) {
1234                 ip->i_gen = krandom() / 2 + 1;
1235                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1236                         ip->i_flag |= IN_MODIFIED;
1237         }
1238         /*
1239          * Return the locked and refd vnode.
1240          */
1241         *vpp = vp;
1242         return (0);
1243 }
1244
1245 /*
1246  * File handle to vnode
1247  *
1248  * Have to be really careful about stale file handles:
1249  * - check that the inode number is valid
1250  * - call ext2_vget() to get the locked inode
1251  * - check for an unallocated inode (i_mode == 0)
1252  * - check that the given client host has export rights and return
1253  *   those rights via. exflagsp and credanonp
1254  */
1255 static int
1256 ext2_fhtovp(struct mount *mp, struct vnode *rootvp,
1257             struct fid *fhp, struct vnode **vpp)
1258 {
1259         struct ufid *ufhp;
1260         struct ext2_sb_info *fs;
1261         struct inode *ip;
1262         struct vnode *nvp;
1263         int error;
1264
1265         ufhp = (struct ufid *)fhp;
1266         fs = VFSTOEXT2(mp)->um_e2fs;
1267         if (ufhp->ufid_ino < ROOTINO ||
1268             ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1269                 return (ESTALE);
1270
1271         error = VFS_VGET(mp, rootvp, ufhp->ufid_ino, &nvp);
1272         if (error) {
1273                 *vpp = NULLVP;
1274                 return (error);
1275         }
1276         ip = VTOI(nvp);
1277         if (ip->i_mode == 0 ||
1278             ip->i_gen != ufhp->ufid_gen ||
1279             (VFSTOEXT2(mp)->um_i_effnlink_valid ? ip->i_effnlink :
1280             ip->i_nlink) <= 0) {
1281                 vput(nvp);
1282                 *vpp = NULLVP;
1283                 return (ESTALE);
1284         }
1285         *vpp = nvp;
1286         return (0);
1287 }
1288
1289 /*
1290  * Vnode pointer to File handle
1291  */
1292 /* ARGSUSED */
1293 static int
1294 ext2_vptofh(struct vnode *vp, struct fid *fhp)
1295 {
1296         struct inode *ip;
1297         struct ufid *ufhp;
1298
1299         ip = VTOI(vp);
1300         ufhp = (struct ufid *)fhp;
1301         ufhp->ufid_len = sizeof(struct ufid);
1302         ufhp->ufid_ino = ip->i_number;
1303         ufhp->ufid_gen = ip->i_gen;
1304         return (0);
1305 }
1306
1307 /*
1308  * This is the generic part of fhtovp called after the underlying
1309  * filesystem has validated the file handle.
1310  *
1311  * Verify that a host should have access to a filesystem.
1312  */
1313 int
1314 ext2_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
1315                  struct ucred **credanonp)
1316 {
1317         struct netcred *np;
1318         struct ext2mount *ump;
1319
1320         ump = VFSTOEXT2(mp);
1321         /*
1322          * Get the export permission structure for this <mp, client> tuple.
1323          */
1324         np = vfs_export_lookup(mp, &ump->um_export, nam);
1325         if (np == NULL)
1326                 return (EACCES);
1327
1328         *exflagsp = np->netc_exflags;
1329         *credanonp = &np->netc_anon;
1330         return (0);
1331 }
1332
1333 /*
1334  * Write a superblock and associated information back to disk.
1335  */
1336 static int
1337 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1338 {
1339         struct ext2_sb_info *fs = mp->um_e2fs;
1340         struct ext2_super_block *es = fs->s_es;
1341         struct buf *bp;
1342         int error = 0;
1343 /*
1344 kprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1345 */
1346         bp = getblk(mp->um_devvp, SBOFF, SBSIZE, 0, 0);
1347         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1348         if (waitfor == MNT_WAIT)
1349                 error = bwrite(bp);
1350         else
1351                 bawrite(bp);
1352
1353         /*
1354          * The buffers for group descriptors, inode bitmaps and block bitmaps
1355          * are not busy at this point and are (hopefully) written by the
1356          * usual sync mechanism. No need to write them here
1357          */
1358
1359         return (error);
1360 }