ext2_vfsops.c revision 125991
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: head/sys/gnu/fs/ext2fs/ext2_vfsops.c 125991 2004-02-19 09:06:06Z tjr $ 41 */ 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/namei.h> 46#include <sys/proc.h> 47#include <sys/kernel.h> 48#include <sys/vnode.h> 49#include <sys/mount.h> 50#include <sys/bio.h> 51#include <sys/buf.h> 52#include <sys/conf.h> 53#include <sys/fcntl.h> 54#include <sys/malloc.h> 55#include <sys/stat.h> 56#include <sys/mutex.h> 57 58#include <gnu/ext2fs/ext2_mount.h> 59#include <gnu/ext2fs/inode.h> 60 61#include <gnu/ext2fs/fs.h> 62#include <gnu/ext2fs/ext2_extern.h> 63#include <gnu/ext2fs/ext2_fs.h> 64#include <gnu/ext2fs/ext2_fs_sb.h> 65 66static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 67static int ext2_mountfs(struct vnode *, struct mount *, struct thread *); 68static int ext2_reload(struct mount *mp, struct ucred *cred, struct thread *td); 69static int ext2_sbupdate(struct ext2mount *, int); 70 71static vfs_unmount_t ext2_unmount; 72static vfs_root_t ext2_root; 73static vfs_statfs_t ext2_statfs; 74static vfs_sync_t ext2_sync; 75static vfs_vget_t ext2_vget; 76static vfs_fhtovp_t ext2_fhtovp; 77static vfs_vptofh_t ext2_vptofh; 78static vfs_init_t ext2_init; 79static vfs_uninit_t ext2_uninit; 80static vfs_nmount_t ext2_mount; 81 82MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part"); 83static MALLOC_DEFINE(M_EXT2MNT, "EXT2 mount", "EXT2 mount structure"); 84 85static struct vfsops ext2fs_vfsops = { 86 .vfs_fhtovp = ext2_fhtovp, 87 .vfs_init = ext2_init, 88 .vfs_nmount = ext2_mount, 89 .vfs_root = ext2_root, /* root inode via vget */ 90 .vfs_statfs = ext2_statfs, 91 .vfs_sync = ext2_sync, 92 .vfs_uninit = ext2_uninit, 93 .vfs_unmount = ext2_unmount, 94 .vfs_vget = ext2_vget, 95 .vfs_vptofh = ext2_vptofh, 96}; 97 98VFS_SET(ext2fs_vfsops, ext2fs, 0); 99#define bsd_malloc malloc 100#define bsd_free free 101 102static int ext2fs_inode_hash_lock; 103 104static int ext2_check_sb_compat(struct ext2_super_block *es, dev_t dev, 105 int ronly); 106static int compute_sb_data(struct vnode * devvp, 107 struct ext2_super_block * es, struct ext2_sb_info * fs); 108 109#ifdef notyet 110static int ext2_mountroot(void); 111 112/* 113 * Called by main() when ext2fs is going to be mounted as root. 114 * 115 * Name is updated by mount(8) after booting. 116 */ 117#define ROOTNAME "root_device" 118 119static int 120ext2_mountroot() 121{ 122 struct ext2_sb_info *fs; 123 struct mount *mp; 124 struct thread *td = curthread; 125 struct ext2mount *ump; 126 u_int size; 127 int error; 128 129 if ((error = bdevvp(rootdev, &rootvp))) { 130 printf("ext2_mountroot: can't find rootvp\n"); 131 return (error); 132 } 133 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 134 bzero((char *)mp, (u_long)sizeof(struct mount)); 135 TAILQ_INIT(&mp->mnt_nvnodelist); 136 TAILQ_INIT(&mp->mnt_reservedvnlist); 137 mp->mnt_op = &ext2fs_vfsops; 138 mp->mnt_flag = MNT_RDONLY; 139 if (error = ext2_mountfs(rootvp, mp, td)) { 140 bsd_free(mp, M_MOUNT); 141 return (error); 142 } 143 if (error = vfs_lock(mp)) { 144 (void)ext2_unmount(mp, 0, td); 145 bsd_free(mp, M_MOUNT); 146 return (error); 147 } 148 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 149 mp->mnt_flag |= MNT_ROOTFS; 150 mp->mnt_vnodecovered = NULLVP; 151 ump = VFSTOEXT2(mp); 152 fs = ump->um_e2fs; 153 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 154 fs->fs_fsmnt[0] = '/'; 155 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 156 MNAMELEN); 157 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 158 &size); 159 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 160 (void)ext2_statfs(mp, &mp->mnt_stat, td); 161 vfs_unlock(mp); 162 inittodr(fs->s_es->s_wtime); /* this helps to set the time */ 163 return (0); 164} 165#endif 166 167/* 168 * VFS Operations. 169 * 170 * mount system call 171 */ 172static int 173ext2_mount(mp, ndp, td) 174 struct mount *mp; 175 struct nameidata *ndp; 176 struct thread *td; 177{ 178 struct export_args *export; 179 struct vfsoptlist *opts; 180 struct vnode *devvp; 181 struct ext2mount *ump = 0; 182 struct ext2_sb_info *fs; 183 char *path, *fspec; 184 size_t size; 185 int error, flags, len; 186 mode_t accessmode; 187 188 opts = mp->mnt_optnew; 189 190 vfs_getopt(opts, "fspath", (void **)&path, NULL); 191 /* Double-check the length of path.. */ 192 if (strlen(path) >= MAXMNTLEN - 1) 193 return (ENAMETOOLONG); 194 195 fspec = NULL; 196 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 197 if (!error && fspec[len - 1] != '\0') 198 return (EINVAL); 199 200 /* 201 * If updating, check whether changing from read-only to 202 * read/write; if there is no device name, that's all we do. 203 */ 204 if (mp->mnt_flag & MNT_UPDATE) { 205 ump = VFSTOEXT2(mp); 206 fs = ump->um_e2fs; 207 error = 0; 208 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) { 209 flags = WRITECLOSE; 210 if (mp->mnt_flag & MNT_FORCE) 211 flags |= FORCECLOSE; 212 if (vfs_busy(mp, LK_NOWAIT, 0, td)) 213 return (EBUSY); 214 error = ext2_flushfiles(mp, flags, td); 215 vfs_unbusy(mp, td); 216 if (!error && fs->s_wasvalid) { 217 fs->s_es->s_state |= EXT2_VALID_FS; 218 ext2_sbupdate(ump, MNT_WAIT); 219 } 220 fs->s_rd_only = 1; 221 } 222 if (!error && (mp->mnt_flag & MNT_RELOAD)) 223 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, td); 224 if (error) 225 return (error); 226 devvp = ump->um_devvp; 227 if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev, 228 (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0) 229 return (EPERM); 230 if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 231 /* 232 * If upgrade to read-write by non-root, then verify 233 * that user has necessary permissions on the device. 234 */ 235 if (suser(td)) { 236 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 237 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE, 238 td->td_ucred, td)) != 0) { 239 VOP_UNLOCK(devvp, 0, td); 240 return (error); 241 } 242 VOP_UNLOCK(devvp, 0, td); 243 } 244 245 if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 || 246 (fs->s_es->s_state & EXT2_ERROR_FS)) { 247 if (mp->mnt_flag & MNT_FORCE) { 248 printf( 249"WARNING: %s was not properly dismounted\n", 250 fs->fs_fsmnt); 251 } else { 252 printf( 253"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 254 fs->fs_fsmnt); 255 return (EPERM); 256 } 257 } 258 fs->s_es->s_state &= ~EXT2_VALID_FS; 259 ext2_sbupdate(ump, MNT_WAIT); 260 fs->s_rd_only = 0; 261 } 262 if (fspec == NULL) { 263 error = vfs_getopt(opts, "export", (void **)&export, 264 &len); 265 if (error || len != sizeof(struct export_args)) 266 return (EINVAL); 267 /* Process export requests. */ 268 return (vfs_export(mp, export)); 269 } 270 } 271 /* 272 * Not an update, or updating the name: look up the name 273 * and verify that it refers to a sensible disk device. 274 */ 275 if (fspec == NULL) 276 return (EINVAL); 277 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, td); 278 if ((error = namei(ndp)) != 0) 279 return (error); 280 NDFREE(ndp, NDF_ONLY_PNBUF); 281 devvp = ndp->ni_vp; 282 283 if (!vn_isdisk(devvp, &error)) { 284 vrele(devvp); 285 return (error); 286 } 287 288 /* 289 * If mount by non-root, then verify that user has necessary 290 * permissions on the device. 291 */ 292 if (suser(td)) { 293 accessmode = VREAD; 294 if ((mp->mnt_flag & MNT_RDONLY) == 0) 295 accessmode |= VWRITE; 296 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 297 if ((error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td)) != 0) { 298 vput(devvp); 299 return (error); 300 } 301 VOP_UNLOCK(devvp, 0, td); 302 } 303 304 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 305 error = ext2_mountfs(devvp, mp, td); 306 } else { 307 if (devvp != ump->um_devvp) 308 error = EINVAL; /* needs translation */ 309 else 310 vrele(devvp); 311 } 312 if (error) { 313 vrele(devvp); 314 return (error); 315 } 316 ump = VFSTOEXT2(mp); 317 fs = ump->um_e2fs; 318 /* 319 * Note that this strncpy() is ok because of a check at the start 320 * of ext2_mount(). 321 */ 322 strncpy(fs->fs_fsmnt, path, MAXMNTLEN); 323 fs->fs_fsmnt[MAXMNTLEN - 1] = '\0'; 324 (void)copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 325 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 326 (void)ext2_statfs(mp, &mp->mnt_stat, td); 327 return (0); 328} 329 330/* 331 * checks that the data in the descriptor blocks make sense 332 * this is taken from ext2/super.c 333 */ 334static int ext2_check_descriptors (struct ext2_sb_info * sb) 335{ 336 int i; 337 int desc_block = 0; 338 unsigned long block = sb->s_es->s_first_data_block; 339 struct ext2_group_desc * gdp = NULL; 340 341 /* ext2_debug ("Checking group descriptors"); */ 342 343 for (i = 0; i < sb->s_groups_count; i++) 344 { 345 /* examine next descriptor block */ 346 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 347 gdp = (struct ext2_group_desc *) 348 sb->s_group_desc[desc_block++]->b_data; 349 if (gdp->bg_block_bitmap < block || 350 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 351 { 352 printf ("ext2_check_descriptors: " 353 "Block bitmap for group %d" 354 " not in group (block %lu)!\n", 355 i, (unsigned long) gdp->bg_block_bitmap); 356 return 0; 357 } 358 if (gdp->bg_inode_bitmap < block || 359 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 360 { 361 printf ("ext2_check_descriptors: " 362 "Inode bitmap for group %d" 363 " not in group (block %lu)!\n", 364 i, (unsigned long) gdp->bg_inode_bitmap); 365 return 0; 366 } 367 if (gdp->bg_inode_table < block || 368 gdp->bg_inode_table + sb->s_itb_per_group >= 369 block + EXT2_BLOCKS_PER_GROUP(sb)) 370 { 371 printf ("ext2_check_descriptors: " 372 "Inode table for group %d" 373 " not in group (block %lu)!\n", 374 i, (unsigned long) gdp->bg_inode_table); 375 return 0; 376 } 377 block += EXT2_BLOCKS_PER_GROUP(sb); 378 gdp++; 379 } 380 return 1; 381} 382 383static int 384ext2_check_sb_compat(es, dev, ronly) 385 struct ext2_super_block *es; 386 dev_t dev; 387 int ronly; 388{ 389 390 if (es->s_magic != EXT2_SUPER_MAGIC) { 391 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 392 devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC); 393 return (1); 394 } 395 if (es->s_rev_level > EXT2_GOOD_OLD_REV) { 396 if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) { 397 printf( 398"WARNING: mount of %s denied due to unsupported optional features\n", 399 devtoname(dev)); 400 return (1); 401 } 402 if (!ronly && 403 (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) { 404 printf( 405"WARNING: R/W mount of %s denied due to unsupported optional features\n", 406 devtoname(dev)); 407 return (1); 408 } 409 } 410 return (0); 411} 412 413/* 414 * this computes the fields of the ext2_sb_info structure from the 415 * data in the ext2_super_block structure read in 416 */ 417static int compute_sb_data(devvp, es, fs) 418 struct vnode * devvp; 419 struct ext2_super_block * es; 420 struct ext2_sb_info * fs; 421{ 422 int db_count, error; 423 int i, j; 424 int logic_sb_block = 1; /* XXX for now */ 425 426#if 1 427#define V(v) 428#else 429#define V(v) printf(#v"= %d\n", fs->v); 430#endif 431 432 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size; 433 V(s_blocksize) 434 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size; 435 V(s_bshift) 436 fs->s_fsbtodb = es->s_log_block_size + 1; 437 V(s_fsbtodb) 438 fs->s_qbmask = fs->s_blocksize - 1; 439 V(s_bmask) 440 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es); 441 V(s_blocksize_bits) 442 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size; 443 V(s_frag_size) 444 if (fs->s_frag_size) 445 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size; 446 V(s_frags_per_block) 447 fs->s_blocks_per_group = es->s_blocks_per_group; 448 V(s_blocks_per_group) 449 fs->s_frags_per_group = es->s_frags_per_group; 450 V(s_frags_per_group) 451 fs->s_inodes_per_group = es->s_inodes_per_group; 452 V(s_inodes_per_group) 453 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE; 454 V(s_inodes_per_block) 455 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block; 456 V(s_itb_per_group) 457 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc); 458 V(s_desc_per_block) 459 /* s_resuid / s_resgid ? */ 460 fs->s_groups_count = (es->s_blocks_count - 461 es->s_first_data_block + 462 EXT2_BLOCKS_PER_GROUP(fs) - 1) / 463 EXT2_BLOCKS_PER_GROUP(fs); 464 V(s_groups_count) 465 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) / 466 EXT2_DESC_PER_BLOCK(fs); 467 fs->s_db_per_group = db_count; 468 V(s_db_per_group) 469 470 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *), 471 M_EXT2MNT, M_WAITOK); 472 473 /* adjust logic_sb_block */ 474 if(fs->s_blocksize > SBSIZE) 475 /* Godmar thinks: if the blocksize is greater than 1024, then 476 the superblock is logically part of block zero. 477 */ 478 logic_sb_block = 0; 479 480 for (i = 0; i < db_count; i++) { 481 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1), 482 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]); 483 if(error) { 484 for (j = 0; j < i; j++) 485 brelse(fs->s_group_desc[j]); 486 bsd_free(fs->s_group_desc, M_EXT2MNT); 487 printf("EXT2-fs: unable to read group descriptors (%d)\n", error); 488 return EIO; 489 } 490 LCK_BUF(fs->s_group_desc[i]) 491 } 492 if(!ext2_check_descriptors(fs)) { 493 for (j = 0; j < db_count; j++) 494 ULCK_BUF(fs->s_group_desc[j]) 495 bsd_free(fs->s_group_desc, M_EXT2MNT); 496 printf("EXT2-fs: (ext2_check_descriptors failure) " 497 "unable to read group descriptors\n"); 498 return EIO; 499 } 500 501 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) { 502 fs->s_inode_bitmap_number[i] = 0; 503 fs->s_inode_bitmap[i] = NULL; 504 fs->s_block_bitmap_number[i] = 0; 505 fs->s_block_bitmap[i] = NULL; 506 } 507 fs->s_loaded_inode_bitmaps = 0; 508 fs->s_loaded_block_bitmaps = 0; 509 if (es->s_rev_level == EXT2_GOOD_OLD_REV || (es->s_feature_ro_compat & 510 EXT2_FEATURE_RO_COMPAT_LARGE_FILE) == 0) 511 fs->fs_maxfilesize = 0x7fffffff; 512 else 513 fs->fs_maxfilesize = 0x7fffffffffffffff; 514 return 0; 515} 516 517/* 518 * Reload all incore data for a filesystem (used after running fsck on 519 * the root filesystem and finding things to fix). The filesystem must 520 * be mounted read-only. 521 * 522 * Things to do to update the mount: 523 * 1) invalidate all cached meta-data. 524 * 2) re-read superblock from disk. 525 * 3) re-read summary information from disk. 526 * 4) invalidate all inactive vnodes. 527 * 5) invalidate all cached file data. 528 * 6) re-read inode data for all active vnodes. 529 */ 530static int 531ext2_reload(mp, cred, td) 532 struct mount *mp; 533 struct ucred *cred; 534 struct thread *td; 535{ 536 struct vnode *vp, *nvp, *devvp; 537 struct inode *ip; 538 struct buf *bp; 539 struct ext2_super_block * es; 540 struct ext2_sb_info *fs; 541 int error; 542 543 if ((mp->mnt_flag & MNT_RDONLY) == 0) 544 return (EINVAL); 545 /* 546 * Step 1: invalidate all cached meta-data. 547 */ 548 devvp = VFSTOEXT2(mp)->um_devvp; 549 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 550 if (vinvalbuf(devvp, 0, cred, td, 0, 0) != 0) 551 panic("ext2_reload: dirty1"); 552 VOP_UNLOCK(devvp, 0, td); 553 554 /* 555 * Step 2: re-read superblock from disk. 556 * constants have been adjusted for ext2 557 */ 558 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 559 return (error); 560 es = (struct ext2_super_block *)bp->b_data; 561 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 562 brelse(bp); 563 return (EIO); /* XXX needs translation */ 564 } 565 fs = VFSTOEXT2(mp)->um_e2fs; 566 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block)); 567 568 if((error = compute_sb_data(devvp, es, fs)) != 0) { 569 brelse(bp); 570 return error; 571 } 572#ifdef UNKLAR 573 if (fs->fs_sbsize < SBSIZE) 574 bp->b_flags |= B_INVAL; 575#endif 576 brelse(bp); 577 578loop: 579 MNT_ILOCK(mp); 580 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 581 if (vp->v_mount != mp) { 582 MNT_IUNLOCK(mp); 583 goto loop; 584 } 585 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 586 VI_LOCK(vp); 587 if (vp->v_iflag & VI_XLOCK) { 588 VI_UNLOCK(vp); 589 continue; 590 } 591 MNT_IUNLOCK(mp); 592 /* 593 * Step 4: invalidate all inactive vnodes. 594 */ 595 if (vp->v_usecount == 0) { 596 vgonel(vp, td); 597 goto loop; 598 } 599 /* 600 * Step 5: invalidate all cached file data. 601 */ 602 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 603 goto loop; 604 } 605 if (vinvalbuf(vp, 0, cred, td, 0, 0)) 606 panic("ext2_reload: dirty2"); 607 /* 608 * Step 6: re-read inode data for all active vnodes. 609 */ 610 ip = VTOI(vp); 611 error = 612 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 613 (int)fs->s_blocksize, NOCRED, &bp); 614 if (error) { 615 VOP_UNLOCK(vp, 0, td); 616 vrele(vp); 617 return (error); 618 } 619 ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data + 620 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), ip); 621 brelse(bp); 622 VOP_UNLOCK(vp, 0, td); 623 vrele(vp); 624 MNT_ILOCK(mp); 625 } 626 MNT_IUNLOCK(mp); 627 return (0); 628} 629 630/* 631 * Common code for mount and mountroot 632 */ 633static int 634ext2_mountfs(devvp, mp, td) 635 struct vnode *devvp; 636 struct mount *mp; 637 struct thread *td; 638{ 639 struct ext2mount *ump; 640 struct buf *bp; 641 struct ext2_sb_info *fs; 642 struct ext2_super_block * es; 643 dev_t dev = devvp->v_rdev; 644 int error; 645 int ronly; 646 647 /* 648 * Disallow multiple mounts of the same device. 649 * Disallow mounting of a device that is currently in use 650 * (except for root, which might share swap device for miniroot). 651 * Flush out any old buffers remaining from a previous use. 652 */ 653 if ((error = vfs_mountedon(devvp)) != 0) 654 return (error); 655 if (vcount(devvp) > 1 && devvp != rootvp) 656 return (EBUSY); 657 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 658 error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0); 659 if (error) { 660 VOP_UNLOCK(devvp, 0, td); 661 return (error); 662 } 663 664 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 665 /* 666 * XXX: open the device with read and write access even if only 667 * read access is needed now. Write access is needed if the 668 * filesystem is ever mounted read/write, and we don't change the 669 * access mode for remounts. 670 */ 671#ifdef notyet 672 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, FSCRED, td, -1); 673#else 674 error = VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, td, -1); 675#endif 676 VOP_UNLOCK(devvp, 0, td); 677 if (error) 678 return (error); 679 if (devvp->v_rdev->si_iosize_max != 0) 680 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 681 if (mp->mnt_iosize_max > MAXPHYS) 682 mp->mnt_iosize_max = MAXPHYS; 683 684 bp = NULL; 685 ump = NULL; 686 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 687 goto out; 688 es = (struct ext2_super_block *)bp->b_data; 689 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 690 error = EINVAL; /* XXX needs translation */ 691 goto out; 692 } 693 if ((es->s_state & EXT2_VALID_FS) == 0 || 694 (es->s_state & EXT2_ERROR_FS)) { 695 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 696 printf( 697"WARNING: Filesystem was not properly dismounted\n"); 698 } else { 699 printf( 700"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 701 error = EPERM; 702 goto out; 703 } 704 } 705 ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK); 706 bzero((caddr_t)ump, sizeof *ump); 707 /* I don't know whether this is the right strategy. Note that 708 we dynamically allocate both an ext2_sb_info and an ext2_super_block 709 while Linux keeps the super block in a locked buffer 710 */ 711 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info), 712 M_EXT2MNT, M_WAITOK); 713 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block), 714 M_EXT2MNT, M_WAITOK); 715 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block)); 716 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs))) 717 goto out; 718 /* 719 * We don't free the group descriptors allocated by compute_sb_data() 720 * until ext2_unmount(). This is OK since the mount will succeed. 721 */ 722 brelse(bp); 723 bp = NULL; 724 fs = ump->um_e2fs; 725 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */ 726 /* if the fs is not mounted read-only, make sure the super block is 727 always written back on a sync() 728 */ 729 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0; 730 if (ronly == 0) { 731 fs->s_dirt = 1; /* mark it modified */ 732 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */ 733 } 734 mp->mnt_data = (qaddr_t)ump; 735 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 736 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 737 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 738 mp->mnt_flag |= MNT_LOCAL; 739 ump->um_mountp = mp; 740 ump->um_dev = dev; 741 ump->um_devvp = devvp; 742 /* setting those two parameters allowed us to use 743 ufs_bmap w/o changse ! 744 */ 745 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 746 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1; 747 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 748 devvp->v_rdev->si_mountpoint = mp; 749 if (ronly == 0) 750 ext2_sbupdate(ump, MNT_WAIT); 751 return (0); 752out: 753 if (bp) 754 brelse(bp); 755 /* XXX: see comment above VOP_OPEN. */ 756#ifdef notyet 757 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 758#else 759 (void)VOP_CLOSE(devvp, FREAD | FWRITE, NOCRED, td); 760#endif 761 if (ump) { 762 bsd_free(ump->um_e2fs->s_es, M_EXT2MNT); 763 bsd_free(ump->um_e2fs, M_EXT2MNT); 764 bsd_free(ump, M_EXT2MNT); 765 mp->mnt_data = (qaddr_t)0; 766 } 767 return (error); 768} 769 770/* 771 * unmount system call 772 */ 773static int 774ext2_unmount(mp, mntflags, td) 775 struct mount *mp; 776 int mntflags; 777 struct thread *td; 778{ 779 struct ext2mount *ump; 780 struct ext2_sb_info *fs; 781 int error, flags, ronly, i; 782 783 flags = 0; 784 if (mntflags & MNT_FORCE) { 785 if (mp->mnt_flag & MNT_ROOTFS) 786 return (EINVAL); 787 flags |= FORCECLOSE; 788 } 789 if ((error = ext2_flushfiles(mp, flags, td)) != 0) 790 return (error); 791 ump = VFSTOEXT2(mp); 792 fs = ump->um_e2fs; 793 ronly = fs->s_rd_only; 794 if (ronly == 0) { 795 if (fs->s_wasvalid) 796 fs->s_es->s_state |= EXT2_VALID_FS; 797 ext2_sbupdate(ump, MNT_WAIT); 798 } 799 800 /* release buffers containing group descriptors */ 801 for(i = 0; i < fs->s_db_per_group; i++) 802 ULCK_BUF(fs->s_group_desc[i]) 803 bsd_free(fs->s_group_desc, M_EXT2MNT); 804 805 /* release cached inode/block bitmaps */ 806 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 807 if (fs->s_inode_bitmap[i]) 808 ULCK_BUF(fs->s_inode_bitmap[i]) 809 810 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 811 if (fs->s_block_bitmap[i]) 812 ULCK_BUF(fs->s_block_bitmap[i]) 813 814 ump->um_devvp->v_rdev->si_mountpoint = NULL; 815 /* XXX: see comment above VOP_OPEN. */ 816#ifdef notyet 817 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD | FWRITE, 818 NOCRED, td); 819#else 820 error = VOP_CLOSE(ump->um_devvp, FREAD | FWRITE, NOCRED, td); 821#endif 822 vrele(ump->um_devvp); 823 bsd_free(fs->s_es, M_EXT2MNT); 824 bsd_free(fs, M_EXT2MNT); 825 bsd_free(ump, M_EXT2MNT); 826 mp->mnt_data = (qaddr_t)0; 827 mp->mnt_flag &= ~MNT_LOCAL; 828 return (error); 829} 830 831/* 832 * Flush out all the files in a filesystem. 833 */ 834static int 835ext2_flushfiles(mp, flags, td) 836 struct mount *mp; 837 int flags; 838 struct thread *td; 839{ 840 int error; 841 842 error = vflush(mp, 0, flags); 843 return (error); 844} 845 846/* 847 * Get file system statistics. 848 * taken from ext2/super.c ext2_statfs 849 */ 850static int 851ext2_statfs(mp, sbp, td) 852 struct mount *mp; 853 struct statfs *sbp; 854 struct thread *td; 855{ 856 unsigned long overhead; 857 struct ext2mount *ump; 858 struct ext2_sb_info *fs; 859 struct ext2_super_block *es; 860 int i, nsb; 861 862 ump = VFSTOEXT2(mp); 863 fs = ump->um_e2fs; 864 es = fs->s_es; 865 866 if (es->s_magic != EXT2_SUPER_MAGIC) 867 panic("ext2_statfs - magic number spoiled"); 868 869 /* 870 * Compute the overhead (FS structures) 871 */ 872 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) { 873 nsb = 0; 874 for (i = 0 ; i < fs->s_groups_count; i++) 875 if (ext2_group_sparse(i)) 876 nsb++; 877 } else 878 nsb = fs->s_groups_count; 879 overhead = es->s_first_data_block + 880 /* Superblocks and block group descriptors: */ 881 nsb * (1 + fs->s_db_per_group) + 882 /* Inode bitmap, block bitmap, and inode table: */ 883 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group); 884 885 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 886 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 887 sbp->f_blocks = es->s_blocks_count - overhead; 888 sbp->f_bfree = es->s_free_blocks_count; 889 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count; 890 sbp->f_files = es->s_inodes_count; 891 sbp->f_ffree = es->s_free_inodes_count; 892 if (sbp != &mp->mnt_stat) { 893 sbp->f_type = mp->mnt_vfc->vfc_typenum; 894 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 895 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 896 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 897 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 898 } 899 return (0); 900} 901 902/* 903 * Go through the disk queues to initiate sandbagged IO; 904 * go through the inodes to write those that have been modified; 905 * initiate the writing of the super block if it has been modified. 906 * 907 * Note: we are always called with the filesystem marked `MPBUSY'. 908 */ 909static int 910ext2_sync(mp, waitfor, cred, td) 911 struct mount *mp; 912 int waitfor; 913 struct ucred *cred; 914 struct thread *td; 915{ 916 struct vnode *nvp, *vp; 917 struct inode *ip; 918 struct ext2mount *ump = VFSTOEXT2(mp); 919 struct ext2_sb_info *fs; 920 int error, allerror = 0; 921 922 fs = ump->um_e2fs; 923 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */ 924 printf("fs = %s\n", fs->fs_fsmnt); 925 panic("ext2_sync: rofs mod"); 926 } 927 /* 928 * Write back each (modified) inode. 929 */ 930 MNT_ILOCK(mp); 931loop: 932 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 933 /* 934 * If the vnode that we are about to sync is no longer 935 * associated with this mount point, start over. 936 */ 937 if (vp->v_mount != mp) 938 goto loop; 939 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 940 VI_LOCK(vp); 941 if (vp->v_iflag & VI_XLOCK) { 942 VI_UNLOCK(vp); 943 continue; 944 } 945 MNT_IUNLOCK(mp); 946 ip = VTOI(vp); 947 if (vp->v_type == VNON || 948 ((ip->i_flag & 949 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 950 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 951 VI_UNLOCK(vp); 952 MNT_ILOCK(mp); 953 continue; 954 } 955 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 956 if (error) { 957 MNT_ILOCK(mp); 958 if (error == ENOENT) 959 goto loop; 960 continue; 961 } 962 if ((error = VOP_FSYNC(vp, cred, waitfor, td)) != 0) 963 allerror = error; 964 VOP_UNLOCK(vp, 0, td); 965 vrele(vp); 966 MNT_ILOCK(mp); 967 } 968 MNT_IUNLOCK(mp); 969 /* 970 * Force stale file system control information to be flushed. 971 */ 972 if (waitfor != MNT_LAZY) { 973 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td); 974 if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, td)) != 0) 975 allerror = error; 976 VOP_UNLOCK(ump->um_devvp, 0, td); 977 } 978 /* 979 * Write back modified superblock. 980 */ 981 if (fs->s_dirt != 0) { 982 fs->s_dirt = 0; 983 fs->s_es->s_wtime = time_second; 984 if ((error = ext2_sbupdate(ump, waitfor)) != 0) 985 allerror = error; 986 } 987 return (allerror); 988} 989 990/* 991 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 992 * in from disk. If it is in core, wait for the lock bit to clear, then 993 * return the inode locked. Detection and handling of mount points must be 994 * done by the calling routine. 995 */ 996static int 997ext2_vget(mp, ino, flags, vpp) 998 struct mount *mp; 999 ino_t ino; 1000 int flags; 1001 struct vnode **vpp; 1002{ 1003 struct ext2_sb_info *fs; 1004 struct inode *ip; 1005 struct ext2mount *ump; 1006 struct buf *bp; 1007 struct vnode *vp; 1008 dev_t dev; 1009 int i, error; 1010 int used_blocks; 1011 1012 ump = VFSTOEXT2(mp); 1013 dev = ump->um_dev; 1014restart: 1015 if ((error = ext2_ihashget(dev, ino, flags, vpp)) != 0) 1016 return (error); 1017 if (*vpp != NULL) 1018 return (0); 1019 1020 /* 1021 * Lock out the creation of new entries in the FFS hash table in 1022 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate 1023 * may occur! 1024 */ 1025 if (ext2fs_inode_hash_lock) { 1026 while (ext2fs_inode_hash_lock) { 1027 ext2fs_inode_hash_lock = -1; 1028 tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0); 1029 } 1030 goto restart; 1031 } 1032 ext2fs_inode_hash_lock = 1; 1033 1034 /* 1035 * If this MALLOC() is performed after the getnewvnode() 1036 * it might block, leaving a vnode with a NULL v_data to be 1037 * found by ext2_sync() if a sync happens to fire right then, 1038 * which will cause a panic because ext2_sync() blindly 1039 * dereferences vp->v_data (as well it should). 1040 */ 1041 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK); 1042 1043 /* Allocate a new vnode/inode. */ 1044 if ((error = getnewvnode("ext2fs", mp, ext2_vnodeop_p, &vp)) != 0) { 1045 if (ext2fs_inode_hash_lock < 0) 1046 wakeup(&ext2fs_inode_hash_lock); 1047 ext2fs_inode_hash_lock = 0; 1048 *vpp = NULL; 1049 FREE(ip, M_EXT2NODE); 1050 return (error); 1051 } 1052 bzero((caddr_t)ip, sizeof(struct inode)); 1053 vp->v_data = ip; 1054 ip->i_vnode = vp; 1055 ip->i_e2fs = fs = ump->um_e2fs; 1056 ip->i_dev = dev; 1057 ip->i_number = ino; 1058 /* 1059 * Put it onto its hash chain and lock it so that other requests for 1060 * this inode will block if they arrive while we are sleeping waiting 1061 * for old data structures to be purged or for the contents of the 1062 * disk portion of this inode to be read. 1063 */ 1064 ext2_ihashins(ip); 1065 1066 if (ext2fs_inode_hash_lock < 0) 1067 wakeup(&ext2fs_inode_hash_lock); 1068 ext2fs_inode_hash_lock = 0; 1069 1070 /* Read in the disk contents for the inode, copy into the inode. */ 1071#if 0 1072printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino))); 1073#endif 1074 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1075 (int)fs->s_blocksize, NOCRED, &bp)) != 0) { 1076 /* 1077 * The inode does not contain anything useful, so it would 1078 * be misleading to leave it on its hash chain. With mode 1079 * still zero, it will be unlinked and returned to the free 1080 * list by vput(). 1081 */ 1082 vput(vp); 1083 brelse(bp); 1084 *vpp = NULL; 1085 return (error); 1086 } 1087 /* convert ext2 inode to dinode */ 1088 ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE * 1089 ino_to_fsbo(fs, ino)), ip); 1090 ip->i_block_group = ino_to_cg(fs, ino); 1091 ip->i_next_alloc_block = 0; 1092 ip->i_next_alloc_goal = 0; 1093 ip->i_prealloc_count = 0; 1094 ip->i_prealloc_block = 0; 1095 /* now we want to make sure that block pointers for unused 1096 blocks are zeroed out - ext2_balloc depends on this 1097 although for regular files and directories only 1098 */ 1099 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 1100 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize; 1101 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1102 ip->i_db[i] = 0; 1103 } 1104/* 1105 ext2_print_inode(ip); 1106*/ 1107 brelse(bp); 1108 1109 /* 1110 * Initialize the vnode from the inode, check for aliases. 1111 * Note that the underlying vnode may have changed. 1112 */ 1113 if ((error = ext2_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) != 0) { 1114 vput(vp); 1115 *vpp = NULL; 1116 return (error); 1117 } 1118 /* 1119 * Finish inode initialization now that aliasing has been resolved. 1120 */ 1121 ip->i_devvp = ump->um_devvp; 1122 VREF(ip->i_devvp); 1123 /* 1124 * Set up a generation number for this inode if it does not 1125 * already have one. This should only happen on old filesystems. 1126 */ 1127 if (ip->i_gen == 0) { 1128 ip->i_gen = random() / 2 + 1; 1129 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1130 ip->i_flag |= IN_MODIFIED; 1131 } 1132 *vpp = vp; 1133 return (0); 1134} 1135 1136/* 1137 * File handle to vnode 1138 * 1139 * Have to be really careful about stale file handles: 1140 * - check that the inode number is valid 1141 * - call ext2_vget() to get the locked inode 1142 * - check for an unallocated inode (i_mode == 0) 1143 * - check that the given client host has export rights and return 1144 * those rights via. exflagsp and credanonp 1145 */ 1146static int 1147ext2_fhtovp(mp, fhp, vpp) 1148 struct mount *mp; 1149 struct fid *fhp; 1150 struct vnode **vpp; 1151{ 1152 struct inode *ip; 1153 struct ufid *ufhp; 1154 struct vnode *nvp; 1155 struct ext2_sb_info *fs; 1156 int error; 1157 1158 ufhp = (struct ufid *)fhp; 1159 fs = VFSTOEXT2(mp)->um_e2fs; 1160 if (ufhp->ufid_ino < ROOTINO || 1161 ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group) 1162 return (ESTALE); 1163 1164 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1165 if (error) { 1166 *vpp = NULLVP; 1167 return (error); 1168 } 1169 ip = VTOI(nvp); 1170 if (ip->i_mode == 0 || 1171 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1172 vput(nvp); 1173 *vpp = NULLVP; 1174 return (ESTALE); 1175 } 1176 *vpp = nvp; 1177 return (0); 1178} 1179 1180/* 1181 * Vnode pointer to File handle 1182 */ 1183/* ARGSUSED */ 1184static int 1185ext2_vptofh(vp, fhp) 1186 struct vnode *vp; 1187 struct fid *fhp; 1188{ 1189 struct inode *ip; 1190 struct ufid *ufhp; 1191 1192 ip = VTOI(vp); 1193 ufhp = (struct ufid *)fhp; 1194 ufhp->ufid_len = sizeof(struct ufid); 1195 ufhp->ufid_ino = ip->i_number; 1196 ufhp->ufid_gen = ip->i_gen; 1197 return (0); 1198} 1199 1200/* 1201 * Write a superblock and associated information back to disk. 1202 */ 1203static int 1204ext2_sbupdate(mp, waitfor) 1205 struct ext2mount *mp; 1206 int waitfor; 1207{ 1208 struct ext2_sb_info *fs = mp->um_e2fs; 1209 struct ext2_super_block *es = fs->s_es; 1210 struct buf *bp; 1211 int error = 0; 1212/* 1213printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no"); 1214*/ 1215 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1216 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block)); 1217 if (waitfor == MNT_WAIT) 1218 error = bwrite(bp); 1219 else 1220 bawrite(bp); 1221 1222 /* 1223 * The buffers for group descriptors, inode bitmaps and block bitmaps 1224 * are not busy at this point and are (hopefully) written by the 1225 * usual sync mechanism. No need to write them here 1226 */ 1227 1228 return (error); 1229} 1230 1231/* 1232 * Return the root of a filesystem. 1233 */ 1234static int 1235ext2_root(mp, vpp) 1236 struct mount *mp; 1237 struct vnode **vpp; 1238{ 1239 struct vnode *nvp; 1240 int error; 1241 1242 error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp); 1243 if (error) 1244 return (error); 1245 *vpp = nvp; 1246 return (0); 1247} 1248 1249static int 1250ext2_init(struct vfsconf *vfsp) 1251{ 1252 1253 ext2_ihashinit(); 1254 return (0); 1255} 1256 1257static int 1258ext2_uninit(struct vfsconf *vfsp) 1259{ 1260 1261 ext2_ihashuninit(); 1262 return (0); 1263} 1264