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 1.56.4.1 2008/09/25 02:20:49 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/kernel.h>
  51 #include <sys/vnode.h>
  52 #include <sys/mount.h>
  53 #include <sys/buf.h>
  54 #include <sys/conf.h>
  55 #include <sys/fcntl.h>
  56 #include <sys/diskslice.h>
  57 #include <sys/malloc.h>
  58 #include <sys/stat.h>
  59 #include <vm/vm_zone.h>
  60
  61 #include <sys/buf2.h>
  62 #include <sys/thread2.h>
  63
  64 #include "quota.h"
  65 #include "dinode.h"
  66 #include "inode.h"
  67 #include "ext2mount.h"
  68 #include "ext2_extern.h"
  69
  70 #include "fs.h"
  71 #include "ext2_fs.h"
  72 #include "ext2_fs_sb.h"
  73
  74 extern struct vop_ops ext2_vnode_vops;
  75 extern struct vop_ops ext2_spec_vops;
  76 extern struct vop_ops ext2_fifo_vops;
  77
  78 static int ext2_fhtovp (struct mount *, struct vnode *,
  79                                 struct fid *, struct vnode **);
  80 static int ext2_flushfiles (struct mount *mp, int flags);
  81 static int ext2_mount (struct mount *, char *, caddr_t, struct ucred *);
  82 static int ext2_mountfs (struct vnode *, struct mount *, struct ucred *);
  83 static int ext2_root(struct mount *, struct vnode **);
  84 static int ext2_reload (struct mount *mountp, struct ucred *cred);
  85 static int ext2_sbupdate (struct ext2mount *, int);
  86 static int ext2_statfs (struct mount *, struct statfs *, struct ucred *);
  87 static int ext2_sync (struct mount *, int);
  88 static int ext2_unmount (struct mount *, int);
  89 static int ext2_vget (struct mount *, ino_t, struct vnode **);
  90 static int ext2_init(struct vfsconf *);
  91 static int ext2_vptofh (struct vnode *, struct fid *);
  92
  93 static MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part");
  94 MALLOC_DEFINE(M_EXT2MNT, "EXT2 mount", "EXT2 mount structure");
  95
  96 static struct vfsops ext2fs_vfsops = {
  97         .vfs_mount =            ext2_mount,
  98         .vfs_unmount =          ext2_unmount,
  99         .vfs_root =             ext2_root,      /* root inode via vget */
 100         .vfs_quotactl =         ext2_quotactl,  /* quota operations */
 101         .vfs_statfs =           ext2_statfs,
 102         .vfs_sync =             ext2_sync,
 103         .vfs_vget =             ext2_vget,
 104         .vfs_fhtovp =           ext2_fhtovp,
 105         .vfs_checkexp =         ext2_check_export,
 106         .vfs_vptofh =           ext2_vptofh,
 107         .vfs_init =             ext2_init,
 108         .vfs_uninit =           ext2_uninit
 109 };
 110
 111 VFS_SET(ext2fs_vfsops, ext2fs, 0);
 112 #define bsd_malloc kmalloc
 113 #define bsd_free kfree
 114
 115 static int ext2fs_inode_hash_lock;
 116
 117 static int      ext2_check_sb_compat (struct ext2_super_block *es,
 118                                           cdev_t dev, int ronly);
 119 static int      compute_sb_data (struct vnode * devvp,
 120                                      struct ext2_super_block * es,
 121                                      struct ext2_sb_info * fs);
 122
 123 static int
 124 ext2_root(struct mount *mp, struct vnode **vpp)
 125 {
 126         struct vnode *nvp;
 127         int error;
 128
 129         error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp);
 130         if (error)
 131                 return (error);
 132         *vpp = nvp;
 133         return (0);
 134 }
 135
 136 /*
 137  * Do operations associated with quotas
 138  */
 139 int
 140 ext2_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
 141              struct ucred *cred)
 142 {
 143 #ifndef QUOTA
 144         return (EOPNOTSUPP);
 145 #else
 146         int cmd, type, error;
 147
 148         type = cmds & SUBCMDMASK;
 149         cmd = cmds >> SUBCMDSHIFT;
 150
 151         if (uid == -1) {
 152                 switch(type) {
 153                         case USRQUOTA:
 154                                 uid = cred->cr_ruid;
 155                                 break;
 156                         case GRPQUOTA:
 157                                 uid = cred->cr_rgid;
 158                                 break;
 159                         default:
 160                                 return (EINVAL);
 161                 }
 162         }
 163
 164         switch (cmd) {
 165         case Q_SYNC:
 166                 break;
 167         case Q_GETQUOTA:
 168                 if (uid == cred->cr_ruid)
 169                         break;
 170                 /* fall through */
 171         default:
 172                 if ((error = suser_cred(cred, PRISON_ROOT)) != 0)
 173                         return (error);
 174         }
 175
 176         type = cmds & SUBCMDMASK;
 177         if ((uint)type >= MAXQUOTAS)
 178                 return (EINVAL);
 179         if (vfs_busy(mp, LK_NOWAIT))
 180                 return (0);
 181
 182         switch (cmd) {
 183
 184         case Q_QUOTAON:
 185                 error = ext2_quotaon(cred, mp, type, arg);
 186                 break;
 187
 188         case Q_QUOTAOFF:
 189                 error = ext2_quotaoff(mp, type);
 190                 break;
 191
 192         case Q_SETQUOTA:
 193                 error = ext2_setquota(mp, uid, type, arg);
 194                 break;
 195
 196         case Q_SETUSE:
 197                 error = ext2_setuse(mp, uid, type, arg);
 198                 break;
 199
 200         case Q_GETQUOTA:
 201                 error = ext2_getquota(mp, uid, type, arg);
 202                 break;
 203
 204         case Q_SYNC:
 205                 error = ext2_qsync(mp);
 206                 break;
 207
 208         default:
 209                 error = EINVAL;
 210                 break;
 211         }
 212         vfs_unbusy(mp);
 213         return (error);
 214 #endif
 215 }
 216
 217 /*
 218  * Initial UFS filesystems, done only once.
 219  */
 220 int
 221 ext2_init(struct vfsconf *vfsp)
 222 {
 223         static int done;
 224
 225         if (done)
 226                 return (0);
 227         done = 1;
 228         ext2_ihashinit();
 229 #ifdef QUOTA
 230         ext2_dqinit();
 231 #endif
 232         return (0);
 233 }
 234
 235 /*
 236  * VFS Operations.
 237  *
 238  * mount system call
 239  *
 240  * Parameters:
 241  *      data:   this is actually a (struct ext2_args *)
 242  */
 243 static int
 244 ext2_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 245 {
 246         struct vnode *devvp;
 247         struct ext2_args args;
 248         struct ext2mount *ump = 0;
 249         struct ext2_sb_info *fs;
 250         size_t size;
 251         int error, flags;
 252         mode_t accessmode;
 253         struct nlookupdata nd;
 254
 255         if ((error = copyin(data, (caddr_t)&args, sizeof (struct ext2_args))) != 0)
 256                 return (error);
 257
 258         /*
 259          * If updating, check whether changing from read-only to
 260          * read/write; if there is no device name, that's all we do.
 261          */
 262         if (mp->mnt_flag & MNT_UPDATE) {
 263                 ump = VFSTOEXT2(mp);
 264                 fs = ump->um_e2fs;
 265                 devvp = ump->um_devvp;
 266                 error = 0;
 267                 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 268                         flags = WRITECLOSE;
 269                         if (mp->mnt_flag & MNT_FORCE)
 270                                 flags |= FORCECLOSE;
 271                         if (vfs_busy(mp, LK_NOWAIT))
 272                                 return (EBUSY);
 273                         error = ext2_flushfiles(mp, flags);
 274                         vfs_unbusy(mp);
 275                         if (!error && fs->s_wasvalid) {
 276                                 fs->s_es->s_state |= EXT2_VALID_FS;
 277                                 ext2_sbupdate(ump, MNT_WAIT);
 278                         }
 279                         fs->s_rd_only = 1;
 280                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 281                         VOP_OPEN(devvp, FREAD, FSCRED, NULL);
 282                         VOP_CLOSE(devvp, FREAD|FWRITE);
 283                         vn_unlock(devvp);
 284                 }
 285                 if (!error && (mp->mnt_flag & MNT_RELOAD))
 286                         error = ext2_reload(mp, cred);
 287                 if (error)
 288                         return (error);
 289                 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev,
 290                     (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0)
 291                         return (EPERM);
 292                 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
 293                         /*
 294                          * If upgrade to read-write by non-root, then verify
 295                          * that user has necessary permissions on the device.
 296                          */
 297                         if (cred->cr_uid != 0) {
 298                                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 299                                 error = VOP_ACCESS(devvp, VREAD | VWRITE, cred);
 300                                 if (error) {
 301                                         vn_unlock(devvp);
 302                                         return (error);
 303                                 }
 304                                 vn_unlock(devvp);
 305                         }
 306
 307                         if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
 308                             (fs->s_es->s_state & EXT2_ERROR_FS)) {
 309                                 if (mp->mnt_flag & MNT_FORCE) {
 310                                         kprintf(
 311 "WARNING: %s was not properly dismounted\n",
 312                                             fs->fs_fsmnt);
 313                                 } else {
 314                                         kprintf(
 315 "WARNING: R/W mount of %s denied.  Filesystem is not clean - run fsck\n",
 316                                             fs->fs_fsmnt);
 317                                         return (EPERM);
 318                                 }
 319                         }
 320                         fs->s_es->s_state &= ~EXT2_VALID_FS;
 321                         ext2_sbupdate(ump, MNT_WAIT);
 322                         fs->s_rd_only = 0;
 323                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 324                         VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
 325                         VOP_CLOSE(devvp, FREAD);
 326                         vn_unlock(devvp);
 327                 }
 328                 if (args.fspec == 0) {
 329                         /*
 330                          * Process export requests.
 331                          */
 332                         return (vfs_export(mp, &ump->um_export, &args.export));
 333                 }
 334         }
 335         /*
 336          * Not an update, or updating the name: look up the name
 337          * and verify that it refers to a sensible block device.
 338          */
 339         devvp = NULL;
 340         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 341         if (error == 0)
 342                 error = nlookup(&nd);
 343         if (error == 0)
 344                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 345         nlookup_done(&nd);
 346         if (error)
 347                 return (error);
 348
 349         if (!vn_isdisk(devvp, &error)) {
 350                 vrele(devvp);
 351                 return (error);
 352         }
 353
 354         /*
 355          * If mount by non-root, then verify that user has necessary
 356          * permissions on the device.
 357          */
 358         if (cred->cr_uid != 0) {
 359                 accessmode = VREAD;
 360                 if ((mp->mnt_flag & MNT_RDONLY) == 0)
 361                         accessmode |= VWRITE;
 362                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 363                 if ((error = VOP_ACCESS(devvp, accessmode, cred)) != 0) {
 364                         vput(devvp);
 365                         return (error);
 366                 }
 367                 vn_unlock(devvp);
 368         }
 369
 370         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 371                 error = ext2_mountfs(devvp, mp, cred);
 372         } else {
 373                 if (devvp != ump->um_devvp)
 374                         error = EINVAL; /* needs translation */
 375                 else
 376                         vrele(devvp);
 377         }
 378         if (error) {
 379                 vrele(devvp);
 380                 return (error);
 381         }
 382         ump = VFSTOEXT2(mp);
 383         fs = ump->um_e2fs;
 384         copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
 385         bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
 386         copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 387         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 388         ext2_statfs(mp, &mp->mnt_stat, cred);
 389         return (0);
 390 }
 391
 392 /*
 393  * checks that the data in the descriptor blocks make sense
 394  * this is taken from ext2/super.c
 395  */
 396 static int
 397 ext2_check_descriptors(struct ext2_sb_info *sb)
 398 {
 399         int i;
 400         int desc_block = 0;
 401         unsigned long block = sb->s_es->s_first_data_block;
 402         struct ext2_group_desc * gdp = NULL;
 403
 404         /* ext2_debug ("Checking group descriptors"); */
 405
 406         for (i = 0; i < sb->s_groups_count; i++)
 407         {
 408                 /* examine next descriptor block */
 409                 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
 410                         gdp = (struct ext2_group_desc *)
 411                                 sb->s_group_desc[desc_block++]->b_data;
 412                 if (gdp->bg_block_bitmap < block ||
 413                     gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
 414                 {
 415                         kprintf ("ext2_check_descriptors: "
 416                                     "Block bitmap for group %d"
 417                                     " not in group (block %lu)!\n",
 418                                     i, (unsigned long) gdp->bg_block_bitmap);
 419                         return 0;
 420                 }
 421                 if (gdp->bg_inode_bitmap < block ||
 422                     gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
 423                 {
 424                         kprintf ("ext2_check_descriptors: "
 425                                     "Inode bitmap for group %d"
 426                                     " not in group (block %lu)!\n",
 427                                     i, (unsigned long) gdp->bg_inode_bitmap);
 428                         return 0;
 429                 }
 430                 if (gdp->bg_inode_table < block ||
 431                     gdp->bg_inode_table + sb->s_itb_per_group >=
 432                     block + EXT2_BLOCKS_PER_GROUP(sb))
 433                 {
 434                         kprintf ("ext2_check_descriptors: "
 435                                     "Inode table for group %d"
 436                                     " not in group (block %lu)!\n",
 437                                     i, (unsigned long) gdp->bg_inode_table);
 438                         return 0;
 439                 }
 440                 block += EXT2_BLOCKS_PER_GROUP(sb);
 441                 gdp++;
 442         }
 443         return 1;
 444 }
 445
 446 static int
 447 ext2_check_sb_compat(struct ext2_super_block *es, cdev_t dev, int ronly)
 448 {
 449         if (es->s_magic != EXT2_SUPER_MAGIC) {
 450                 kprintf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
 451                     devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
 452                 return (1);
 453         }
 454         if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
 455                 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
 456                         kprintf(
 457 "WARNING: mount of %s denied due to unsupported optional features\n",
 458                             devtoname(dev));
 459                         return (1);
 460                 }
 461                 if (!ronly &&
 462                     (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
 463                         kprintf(
 464 "WARNING: R/W mount of %s denied due to unsupported optional features\n",
 465                             devtoname(dev));
 466                         return (1);
 467                 }
 468         }
 469         return (0);
 470 }
 471
 472 /*
 473  * this computes the fields of the  ext2_sb_info structure from the
 474  * data in the ext2_super_block structure read in
 475  */
 476 static int
 477 compute_sb_data(struct vnode *devvp, struct ext2_super_block *es,
 478                 struct ext2_sb_info *fs)
 479 {
 480     int db_count, error;
 481     int i, j;
 482     int logic_sb_block = 1;     /* XXX for now */
 483
 484 #if 1
 485 #define V(v)
 486 #else
 487 #define V(v)  kprintf(#v"= %d\n", fs->v);
 488 #endif
 489
 490     fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
 491     V(s_blocksize)
 492     fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
 493     V(s_bshift)
 494     fs->s_fsbtodb = es->s_log_block_size + 1;
 495     V(s_fsbtodb)
 496     fs->s_qbmask = fs->s_blocksize - 1;
 497     V(s_bmask)
 498     fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
 499     V(s_blocksize_bits)
 500     fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
 501     V(s_frag_size)
 502     if (fs->s_frag_size)
 503         fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
 504     V(s_frags_per_block)
 505     fs->s_blocks_per_group = es->s_blocks_per_group;
 506     V(s_blocks_per_group)
 507     fs->s_frags_per_group = es->s_frags_per_group;
 508     V(s_frags_per_group)
 509     fs->s_inodes_per_group = es->s_inodes_per_group;
 510     V(s_inodes_per_group)
 511     fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
 512     V(s_inodes_per_block)
 513     fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
 514     V(s_itb_per_group)
 515     fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
 516     V(s_desc_per_block)
 517     /* s_resuid / s_resgid ? */
 518     fs->s_groups_count = (es->s_blocks_count -
 519                           es->s_first_data_block +
 520                           EXT2_BLOCKS_PER_GROUP(fs) - 1) /
 521                          EXT2_BLOCKS_PER_GROUP(fs);
 522     V(s_groups_count)
 523     db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
 524         EXT2_DESC_PER_BLOCK(fs);
 525     fs->s_db_per_group = db_count;
 526     V(s_db_per_group)
 527
 528     fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
 529                 M_EXT2MNT, M_WAITOK);
 530
 531     /* adjust logic_sb_block */
 532     if(fs->s_blocksize > SBSIZE)
 533         /* Godmar thinks: if the blocksize is greater than 1024, then
 534            the superblock is logically part of block zero.
 535          */
 536         logic_sb_block = 0;
 537
 538     for (i = 0; i < db_count; i++) {
 539         error = bread(devvp, fsbtodoff(fs, logic_sb_block + i + 1),
 540                       fs->s_blocksize, &fs->s_group_desc[i]);
 541         if(error) {
 542             for (j = 0; j < i; j++)
 543                 brelse(fs->s_group_desc[j]);
 544             bsd_free(fs->s_group_desc, M_EXT2MNT);
 545             kprintf("EXT2-fs: unable to read group descriptors (%d)\n", error);
 546             return EIO;
 547         }
 548         /* Set the B_LOCKED flag on the buffer, then brelse() it */
 549         LCK_BUF(fs->s_group_desc[i])
 550     }
 551     if(!ext2_check_descriptors(fs)) {
 552             for (j = 0; j < db_count; j++)
 553                     ULCK_BUF(fs->s_group_desc[j])
 554             bsd_free(fs->s_group_desc, M_EXT2MNT);
 555             kprintf("EXT2-fs: (ext2_check_descriptors failure) "
 556                    "unable to read group descriptors\n");
 557             return EIO;
 558     }
 559
 560     for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
 561             fs->s_inode_bitmap_number[i] = 0;
 562             fs->s_inode_bitmap[i] = NULL;
 563             fs->s_block_bitmap_number[i] = 0;
 564             fs->s_block_bitmap[i] = NULL;
 565     }
 566     fs->s_loaded_inode_bitmaps = 0;
 567     fs->s_loaded_block_bitmaps = 0;
 568     return 0;
 569 }
 570
 571 /*
 572  * Reload all incore data for a filesystem (used after running fsck on
 573  * the root filesystem and finding things to fix). The filesystem must
 574  * be mounted read-only.
 575  *
 576  * Things to do to update the mount:
 577  *      1) invalidate all cached meta-data.
 578  *      2) re-read superblock from disk.
 579  *      3) re-read summary information from disk.
 580  *      4) invalidate all inactive vnodes.
 581  *      5) invalidate all cached file data.
 582  *      6) re-read inode data for all active vnodes.
 583  */
 584 static int ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *rescan);
 585 static int ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *rescan);
 586
 587 struct scaninfo {
 588         int rescan;
 589         int allerror;
 590         int waitfor;
 591         struct vnode *devvp;
 592         struct ext2_sb_info *fs;
 593 };
 594
 595 static int
 596 ext2_reload(struct mount *mountp, struct ucred *cred)
 597 {
 598         struct vnode *devvp;
 599         struct buf *bp;
 600         struct ext2_super_block * es;
 601         struct ext2_sb_info *fs;
 602         int error;
 603         struct scaninfo scaninfo;
 604
 605         if ((mountp->mnt_flag & MNT_RDONLY) == 0)
 606                 return (EINVAL);
 607         /*
 608          * Step 1: invalidate all cached meta-data.
 609          */
 610         devvp = VFSTOEXT2(mountp)->um_devvp;
 611         if (vinvalbuf(devvp, 0, 0, 0))
 612                 panic("ext2_reload: dirty1");
 613         /*
 614          * Step 2: re-read superblock from disk.
 615          * constants have been adjusted for ext2
 616          */
 617         if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
 618                 return (error);
 619         es = (struct ext2_super_block *)bp->b_data;
 620         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
 621                 brelse(bp);
 622                 return (EIO);           /* XXX needs translation */
 623         }
 624         fs = VFSTOEXT2(mountp)->um_e2fs;
 625         bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
 626
 627         if((error = compute_sb_data(devvp, es, fs)) != 0) {
 628                 brelse(bp);
 629                 return error;
 630         }
 631 #ifdef UNKLAR
 632         if (fs->fs_sbsize < SBSIZE)
 633                 bp->b_flags |= B_INVAL;
 634 #endif
 635         brelse(bp);
 636
 637         scaninfo.rescan = 1;
 638         scaninfo.devvp = devvp;
 639         scaninfo.fs = fs;
 640         while (error == 0 && scaninfo.rescan) {
 641             scaninfo.rescan = 0;
 642             error = vmntvnodescan(mountp, VMSC_GETVX, ext2_reload_scan1,
 643                                 ext2_reload_scan2, &scaninfo);
 644         }
 645         return(error);
 646 }
 647
 648 static int
 649 ext2_reload_scan1(struct mount *mp, struct vnode *vp, void *data)
 650 {
 651         /*struct scaninfo *info = data;*/
 652
 653         return(0);
 654 }
 655
 656 static int
 657 ext2_reload_scan2(struct mount *mp, struct vnode *vp, void *data)
 658 {
 659         struct scaninfo *info = data;
 660         struct inode *ip;
 661         struct buf *bp;
 662         int error;
 663
 664         /*
 665          * Try to recycle
 666          */
 667         if (vrecycle(vp))
 668                 return(0);
 669
 670         /*
 671          * Step 5: invalidate all cached file data.
 672          */
 673         if (vinvalbuf(vp, 0, 0, 0))
 674                 panic("ext2_reload: dirty2");
 675         /*
 676          * Step 6: re-read inode data for all active vnodes.
 677          */
 678         ip = VTOI(vp);
 679         error = bread(info->devvp,
 680                       fsbtodoff(info->fs, ino_to_fsba(info->fs, ip->i_number)),
 681                       (int)info->fs->s_blocksize, &bp);
 682         if (error)
 683                 return (error);
 684         ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data +
 685             EXT2_INODE_SIZE * ino_to_fsbo(info->fs, ip->i_number)),
 686             &ip->i_din);
 687         brelse(bp);
 688         return(0);
 689 }
 690
 691 /*
 692  * Common code for mount and mountroot
 693  */
 694 static int
 695 ext2_mountfs(struct vnode *devvp, struct mount *mp, struct ucred *cred)
 696 {
 697         struct ext2mount *ump;
 698         struct buf *bp;
 699         struct ext2_sb_info *fs;
 700         struct ext2_super_block * es;
 701         cdev_t dev;
 702         struct partinfo dpart;
 703         int error, i, size;
 704         int ronly;
 705
 706         /*
 707          * Disallow multiple mounts of the same device.
 708          * Disallow mounting of a device that is currently in use
 709          * (except for root, which might share swap device for miniroot).
 710          * Flush out any old buffers remaining from a previous use.
 711          */
 712         if ((error = vfs_mountedon(devvp)) != 0)
 713                 return (error);
 714         if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
 715                 return (EBUSY);
 716         if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)) != 0)
 717                 return (error);
 718 #ifdef READONLY
 719 /* turn on this to force it to be read-only */
 720         mp->mnt_flag |= MNT_RDONLY;
 721 #endif
 722
 723         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
 724         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 725         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
 726         vn_unlock(devvp);
 727         if (error)
 728                 return (error);
 729         dev = devvp->v_rdev;
 730         if (dev->si_iosize_max != 0)
 731                 mp->mnt_iosize_max = dev->si_iosize_max;
 732         if (mp->mnt_iosize_max > MAXPHYS)
 733                 mp->mnt_iosize_max = MAXPHYS;
 734         if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred) != 0) {
 735                 size = DEV_BSIZE;
 736         } else {
 737                 size = dpart.media_blksize;
 738         }
 739
 740         bp = NULL;
 741         ump = NULL;
 742         if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
 743                 goto out;
 744         es = (struct ext2_super_block *)bp->b_data;
 745         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
 746                 error = EINVAL;         /* XXX needs translation */
 747                 goto out;
 748         }
 749         if ((es->s_state & EXT2_VALID_FS) == 0 ||
 750             (es->s_state & EXT2_ERROR_FS)) {
 751                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
 752                         kprintf(
 753 "WARNING: Filesystem was not properly dismounted\n");
 754                 } else {
 755                         kprintf(
 756 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
 757                         error = EPERM;
 758                         goto out;
 759                 }
 760         }
 761         ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK | M_ZERO);
 762         ump->um_malloctype = M_EXT2NODE;
 763         ump->um_blkatoff = ext2_blkatoff;
 764         ump->um_truncate = ext2_truncate;
 765         ump->um_update = ext2_update;
 766         ump->um_valloc = ext2_valloc;
 767         ump->um_vfree = ext2_vfree;
 768         /* I don't know whether this is the right strategy. Note that
 769            we dynamically allocate both a ext2_sb_info and a ext2_super_block
 770            while Linux keeps the super block in a locked buffer
 771          */
 772         ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
 773                 M_EXT2MNT, M_WAITOK);
 774         ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
 775                 M_EXT2MNT, M_WAITOK);
 776         bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
 777         if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
 778                 goto out;
 779         /*
 780          * We don't free the group descriptors allocated by compute_sb_data()
 781          * until ext2_unmount().  This is OK since the mount will succeed.
 782          */
 783         brelse(bp);
 784         bp = NULL;
 785         fs = ump->um_e2fs;
 786         fs->s_rd_only = ronly;  /* ronly is set according to mnt_flags */
 787         /* if the fs is not mounted read-only, make sure the super block is
 788            always written back on a sync()
 789          */
 790         fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
 791         if (ronly == 0) {
 792                 fs->s_dirt = 1;         /* mark it modified */
 793                 fs->s_es->s_state &= ~EXT2_VALID_FS;    /* set fs invalid */
 794         }
 795         mp->mnt_data = (qaddr_t)ump;
 796         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
 797         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 798         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
 799         mp->mnt_flag |= MNT_LOCAL;
 800         ump->um_mountp = mp;
 801         ump->um_dev = dev;
 802         ump->um_devvp = devvp;
 803         /* setting those two parameters allows us to use
 804            ext2_bmap w/o changse !
 805         */
 806         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
 807         ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
 808         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
 809         for (i = 0; i < MAXQUOTAS; i++)
 810                 ump->um_quotas[i] = NULLVP;
 811         dev->si_mountpoint = mp;
 812
 813         vfs_add_vnodeops(mp, &ext2_vnode_vops, &mp->mnt_vn_norm_ops);
 814         vfs_add_vnodeops(mp, &ext2_spec_vops, &mp->mnt_vn_spec_ops);
 815         vfs_add_vnodeops(mp, &ext2_fifo_vops, &mp->mnt_vn_fifo_ops);
 816
 817         if (ronly == 0)
 818                 ext2_sbupdate(ump, MNT_WAIT);
 819         return (0);
 820 out:
 821         if (bp)
 822                 brelse(bp);
 823         VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE);
 824         if (ump) {
 825                 bsd_free(ump->um_e2fs->s_es, M_EXT2MNT);
 826                 bsd_free(ump->um_e2fs, M_EXT2MNT);
 827                 bsd_free(ump, M_EXT2MNT);
 828                 mp->mnt_data = (qaddr_t)0;
 829         }
 830         return (error);
 831 }
 832
 833 /*
 834  * unmount system call
 835  */
 836 static int
 837 ext2_unmount(struct mount *mp, int mntflags)
 838 {
 839         struct ext2mount *ump;
 840         struct ext2_sb_info *fs;
 841         int error, flags, ronly, i;
 842
 843         flags = 0;
 844         if (mntflags & MNT_FORCE) {
 845                 if (mp->mnt_flag & MNT_ROOTFS)
 846                         return (EINVAL);
 847                 flags |= FORCECLOSE;
 848         }
 849         if ((error = ext2_flushfiles(mp, flags)) != 0)
 850                 return (error);
 851         ump = VFSTOEXT2(mp);
 852         fs = ump->um_e2fs;
 853         ronly = fs->s_rd_only;
 854         if (ronly == 0) {
 855                 if (fs->s_wasvalid)
 856                         fs->s_es->s_state |= EXT2_VALID_FS;
 857                 ext2_sbupdate(ump, MNT_WAIT);
 858         }
 859
 860         /* release buffers containing group descriptors */
 861         for(i = 0; i < fs->s_db_per_group; i++)
 862                 ULCK_BUF(fs->s_group_desc[i])
 863         bsd_free(fs->s_group_desc, M_EXT2MNT);
 864
 865         /* release cached inode/block bitmaps */
 866         for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
 867                 if (fs->s_inode_bitmap[i])
 868                         ULCK_BUF(fs->s_inode_bitmap[i])
 869
 870         for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
 871                 if (fs->s_block_bitmap[i])
 872                         ULCK_BUF(fs->s_block_bitmap[i])
 873
 874         ump->um_devvp->v_rdev->si_mountpoint = NULL;
 875         error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE);
 876         vrele(ump->um_devvp);
 877         bsd_free(fs->s_es, M_EXT2MNT);
 878         bsd_free(fs, M_EXT2MNT);
 879         bsd_free(ump, M_EXT2MNT);
 880         mp->mnt_data = (qaddr_t)0;
 881         mp->mnt_flag &= ~MNT_LOCAL;
 882         return (error);
 883 }
 884
 885 /*
 886  * Flush out all the files in a filesystem.
 887  */
 888 static int
 889 ext2_flushfiles(struct mount *mp, int flags)
 890 {
 891         struct ext2mount *ump;
 892         int error;
 893 #if QUOTA
 894         int i;
 895 #endif
 896
 897         ump = VFSTOEXT2(mp);
 898 #if QUOTA
 899         if (mp->mnt_flag & MNT_QUOTA) {
 900                 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0)
 901                         return (error);
 902                 for (i = 0; i < MAXQUOTAS; i++) {
 903                         if (ump->um_quotas[i] == NULLVP)
 904                                 continue;
 905                         ext2_quotaoff(mp, i);
 906                 }
 907                 /*
 908                  * Here we fall through to vflush again to ensure
 909                  * that we have gotten rid of all the system vnodes.
 910                  */
 911         }
 912 #endif
 913         error = vflush(mp, 0, flags);
 914         return (error);
 915 }
 916
 917 /*
 918  * Get file system statistics.
 919  * taken from ext2/super.c ext2_statfs
 920  */
 921 static int
 922 ext2_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 923 {
 924         unsigned long overhead;
 925         struct ext2mount *ump;
 926         struct ext2_sb_info *fs;
 927         struct ext2_super_block *es;
 928         int i, nsb;
 929
 930         ump = VFSTOEXT2(mp);
 931         fs = ump->um_e2fs;
 932         es = fs->s_es;
 933
 934         if (es->s_magic != EXT2_SUPER_MAGIC)
 935                 panic("ext2_statfs - magic number spoiled");
 936
 937         /*
 938          * Compute the overhead (FS structures)
 939          */
 940         if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
 941                 nsb = 0;
 942                 for (i = 0 ; i < fs->s_groups_count; i++)
 943                         if (ext2_group_sparse(i))
 944                                 nsb++;
 945         } else
 946                 nsb = fs->s_groups_count;
 947         overhead = es->s_first_data_block +
 948             /* Superblocks and block group descriptors: */
 949             nsb * (1 + fs->s_db_per_group) +
 950             /* Inode bitmap, block bitmap, and inode table: */
 951             fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
 952
 953         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
 954         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
 955         sbp->f_blocks = es->s_blocks_count - overhead;
 956         sbp->f_bfree = es->s_free_blocks_count;
 957         sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
 958         sbp->f_files = es->s_inodes_count;
 959         sbp->f_ffree = es->s_free_inodes_count;
 960         if (sbp != &mp->mnt_stat) {
 961                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 962                 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
 963                         (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
 964         }
 965         return (0);
 966 }
 967
 968 /*
 969  * Go through the disk queues to initiate sandbagged IO;
 970  * go through the inodes to write those that have been modified;
 971  * initiate the writing of the super block if it has been modified.
 972  *
 973  * Note: we are always called with the filesystem marked `MPBUSY'.
 974  */
 975
 976 static int ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data);
 977
 978 static int
 979 ext2_sync(struct mount *mp, int waitfor)
 980 {
 981         struct ext2mount *ump = VFSTOEXT2(mp);
 982         struct ext2_sb_info *fs;
 983         struct scaninfo scaninfo;
 984         int error;
 985
 986         fs = ump->um_e2fs;
 987         if (fs->s_dirt != 0 && fs->s_rd_only != 0) {            /* XXX */
 988                 kprintf("fs = %s\n", fs->fs_fsmnt);
 989                 panic("ext2_sync: rofs mod");
 990         }
 991
 992         /*
 993          * Write back each (modified) inode.
 994          */
 995         scaninfo.allerror = 0;
 996         scaninfo.rescan = 1;
 997         scaninfo.waitfor = waitfor;
 998         while (scaninfo.rescan) {
 999                 scaninfo.rescan = 0;
1000                 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
1001                                 NULL, ext2_sync_scan, &scaninfo);
1002         }
1003
1004         /*
1005          * Force stale file system control information to be flushed.
1006          */
1007         if (waitfor != MNT_LAZY) {
1008                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
1009                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor)) != 0)
1010                         scaninfo.allerror = error;
1011                 vn_unlock(ump->um_devvp);
1012         }
1013 #if QUOTA
1014         ext2_qsync(mp);
1015 #endif
1016         /*
1017          * Write back modified superblock.
1018          */
1019         if (fs->s_dirt != 0) {
1020                 fs->s_dirt = 0;
1021                 fs->s_es->s_wtime = time_second;
1022                 if ((error = ext2_sbupdate(ump, waitfor)) != 0)
1023                         scaninfo.allerror = error;
1024         }
1025         return (scaninfo.allerror);
1026 }
1027
1028 static int
1029 ext2_sync_scan(struct mount *mp, struct vnode *vp, void *data)
1030 {
1031         struct scaninfo *info = data;
1032         struct inode *ip;
1033         int error;
1034
1035         ip = VTOI(vp);
1036         if (vp->v_type == VNON ||
1037             ((ip->i_flag &
1038             (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1039             (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) {
1040                 return(0);
1041         }
1042         if ((error = VOP_FSYNC(vp, info->waitfor)) != 0)
1043                 info->allerror = error;
1044         return(0);
1045 }
1046
1047 /*
1048  * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it
1049  * in from disk.  If it is in core, wait for the lock bit to clear, then
1050  * return the inode locked.  Detection and handling of mount points must be
1051  * done by the calling routine.
1052  */
1053 static int
1054 ext2_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
1055 {
1056         struct ext2_sb_info *fs;
1057         struct inode *ip;
1058         struct ext2mount *ump;
1059         struct buf *bp;
1060         struct vnode *vp;
1061         cdev_t dev;
1062         int i, error;
1063         int used_blocks;
1064
1065         ump = VFSTOEXT2(mp);
1066         dev = ump->um_dev;
1067 restart:
1068         if ((*vpp = ext2_ihashget(dev, ino)) != NULL)
1069                 return (0);
1070
1071         /*
1072          * Lock out the creation of new entries in the FFS hash table in
1073          * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1074          * may occur!
1075          */
1076         if (ext2fs_inode_hash_lock) {
1077                 while (ext2fs_inode_hash_lock) {
1078                         ext2fs_inode_hash_lock = -1;
1079                         tsleep(&ext2fs_inode_hash_lock, 0, "e2vget", 0);
1080                 }
1081                 goto restart;
1082         }
1083         ext2fs_inode_hash_lock = 1;
1084
1085         /*
1086          * If this MALLOC() is performed after the getnewvnode()
1087          * it might block, leaving a vnode with a NULL v_data to be
1088          * found by ext2_sync() if a sync happens to fire right then,
1089          * which will cause a panic because ext2_sync() blindly
1090          * dereferences vp->v_data (as well it should).
1091          */
1092         MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK);
1093
1094         /* Allocate a new vnode/inode. */
1095         if ((error = getnewvnode(VT_EXT2FS, mp, &vp, 0, LK_CANRECURSE)) != 0) {
1096                 if (ext2fs_inode_hash_lock < 0)
1097                         wakeup(&ext2fs_inode_hash_lock);
1098                 ext2fs_inode_hash_lock = 0;
1099                 *vpp = NULL;
1100                 FREE(ip, M_EXT2NODE);
1101                 return (error);
1102         }
1103         bzero((caddr_t)ip, sizeof(struct inode));
1104         vp->v_data = ip;
1105         ip->i_vnode = vp;
1106         ip->i_e2fs = fs = ump->um_e2fs;
1107         ip->i_dev = dev;
1108         ip->i_number = ino;
1109 #if QUOTA
1110         for (i = 0; i < MAXQUOTAS; i++)
1111                 ip->i_dquot[i] = NODQUOT;
1112 #endif
1113         /*
1114          * Put it onto its hash chain.  Since our vnode is locked, other
1115          * requests for this inode will block if they arrive while we are
1116          * sleeping waiting for old data structures to be purged or for the
1117          * contents of the disk portion of this inode to be read.
1118          */
1119         ext2_ihashins(ip);
1120
1121         if (ext2fs_inode_hash_lock < 0)
1122                 wakeup(&ext2fs_inode_hash_lock);
1123         ext2fs_inode_hash_lock = 0;
1124
1125         /* Read in the disk contents for the inode, copy into the inode. */
1126 #if 0
1127 kprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
1128 #endif
1129         error = bread(ump->um_devvp, fsbtodoff(fs, ino_to_fsba(fs, ino)),
1130                       (int)fs->s_blocksize, &bp);
1131         if (error) {
1132                 /*
1133                  * The inode does not contain anything useful, so it would
1134                  * be misleading to leave it on its hash chain. With mode
1135                  * still zero, it will be unlinked and returned to the free
1136                  * list by vput().
1137                  */
1138                 vx_put(vp);
1139                 brelse(bp);
1140                 *vpp = NULL;
1141                 return (error);
1142         }
1143         /* convert ext2 inode to dinode */
1144         ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
1145                         ino_to_fsbo(fs, ino)), &ip->i_din);
1146         ip->i_block_group = ino_to_cg(fs, ino);
1147         ip->i_next_alloc_block = 0;
1148         ip->i_next_alloc_goal = 0;
1149         ip->i_prealloc_count = 0;
1150         ip->i_prealloc_block = 0;
1151         /* now we want to make sure that block pointers for unused
1152            blocks are zeroed out - ext2_balloc depends on this
1153            although for regular files and directories only
1154         */
1155         if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
1156                 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
1157                 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
1158                         ip->i_db[i] = 0;
1159         }
1160 #if 0
1161         ext2_print_inode(ip);
1162 #endif
1163         brelse(bp);
1164
1165         /*
1166          * Initialize the vnode from the inode, check for aliases.
1167          * Note that the underlying vnode may have changed.
1168          */
1169         if ((error = ext2_vinit(mp, &vp)) != 0) {
1170                 vx_put(vp);
1171                 *vpp = NULL;
1172                 return (error);
1173         }
1174
1175         /*
1176          * Finish inode initialization now that aliasing has been resolved.
1177          */
1178         ip->i_devvp = ump->um_devvp;
1179         vref(ip->i_devvp);
1180         /*
1181          * Set up a generation number for this inode if it does not
1182          * already have one. This should only happen on old filesystems.
1183          */
1184         if (ip->i_gen == 0) {
1185                 ip->i_gen = krandom() / 2 + 1;
1186                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1187                         ip->i_flag |= IN_MODIFIED;
1188         }
1189         /*
1190          * Return the locked and refd vnode.
1191          */
1192         *vpp = vp;
1193         return (0);
1194 }
1195
1196 /*
1197  * File handle to vnode
1198  *
1199  * Have to be really careful about stale file handles:
1200  * - check that the inode number is valid
1201  * - call ext2_vget() to get the locked inode
1202  * - check for an unallocated inode (i_mode == 0)
1203  * - check that the given client host has export rights and return
1204  *   those rights via. exflagsp and credanonp
1205  */
1206 static int
1207 ext2_fhtovp(struct mount *mp, struct vnode *rootvp,
1208             struct fid *fhp, struct vnode **vpp)
1209 {
1210         struct ufid *ufhp;
1211         struct ext2_sb_info *fs;
1212         struct inode *ip;
1213         struct vnode *nvp;
1214         int error;
1215
1216         ufhp = (struct ufid *)fhp;
1217         fs = VFSTOEXT2(mp)->um_e2fs;
1218         if (ufhp->ufid_ino < ROOTINO ||
1219             ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
1220                 return (ESTALE);
1221
1222         error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
1223         if (error) {
1224                 *vpp = NULLVP;
1225                 return (error);
1226         }
1227         ip = VTOI(nvp);
1228         if (ip->i_mode == 0 ||
1229             ip->i_gen != ufhp->ufid_gen ||
1230             (VFSTOEXT2(mp)->um_i_effnlink_valid ? ip->i_effnlink :
1231             ip->i_nlink) <= 0) {
1232                 vput(nvp);
1233                 *vpp = NULLVP;
1234                 return (ESTALE);
1235         }
1236         *vpp = nvp;
1237         return (0);
1238 }
1239
1240 /*
1241  * Vnode pointer to File handle
1242  */
1243 /* ARGSUSED */
1244 static int
1245 ext2_vptofh(struct vnode *vp, struct fid *fhp)
1246 {
1247         struct inode *ip;
1248         struct ufid *ufhp;
1249
1250         ip = VTOI(vp);
1251         ufhp = (struct ufid *)fhp;
1252         ufhp->ufid_len = sizeof(struct ufid);
1253         ufhp->ufid_ino = ip->i_number;
1254         ufhp->ufid_gen = ip->i_gen;
1255         return (0);
1256 }
1257
1258 /*
1259  * This is the generic part of fhtovp called after the underlying
1260  * filesystem has validated the file handle.
1261  *
1262  * Verify that a host should have access to a filesystem.
1263  */
1264 int
1265 ext2_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
1266                  struct ucred **credanonp)
1267 {
1268         struct netcred *np;
1269         struct ext2mount *ump;
1270
1271         ump = VFSTOEXT2(mp);
1272         /*
1273          * Get the export permission structure for this <mp, client> tuple.
1274          */
1275         np = vfs_export_lookup(mp, &ump->um_export, nam);
1276         if (np == NULL)
1277                 return (EACCES);
1278
1279         *exflagsp = np->netc_exflags;
1280         *credanonp = &np->netc_anon;
1281         return (0);
1282 }
1283
1284 /*
1285  * Write a superblock and associated information back to disk.
1286  */
1287 static int
1288 ext2_sbupdate(struct ext2mount *mp, int waitfor)
1289 {
1290         struct ext2_sb_info *fs = mp->um_e2fs;
1291         struct ext2_super_block *es = fs->s_es;
1292         struct buf *bp;
1293         int error = 0;
1294 /*
1295 kprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
1296 */
1297         bp = getblk(mp->um_devvp, SBOFF, SBSIZE, 0, 0);
1298         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
1299         if (waitfor == MNT_WAIT)
1300                 error = bwrite(bp);
1301         else
1302                 bawrite(bp);
1303
1304         /*
1305          * The buffers for group descriptors, inode bitmaps and block bitmaps
1306          * are not busy at this point and are (hopefully) written by the
1307          * usual sync mechanism. No need to write them here
1308          */
1309
1310         return (error);
1311 }