470 lines
13 KiB
C
470 lines
13 KiB
C
/* $NetBSD: ext2fs.c,v 1.2 2008/04/28 20:24:16 martin Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Manuel Bouyer.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(__lint)
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__RCSID("$NetBSD: ext2fs.c,v 1.2 2008/04/28 20:24:16 martin Exp $");
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#endif /* !__lint */
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#include <sys/param.h>
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#if !HAVE_NBTOOL_CONFIG_H
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#include <sys/mount.h>
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#endif
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "installboot.h"
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#include <ufs/ext2fs/ext2fs_dinode.h>
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#include <ufs/ext2fs/ext2fs_dir.h>
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#include <ufs/ext2fs/ext2fs.h>
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static int ext2fs_read_disk_block(ib_params *, uint64_t, int, uint8_t []);
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static int ext2fs_read_sblock(ib_params *, struct m_ext2fs *fs);
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static int ext2fs_read_gdblock(ib_params *, struct m_ext2fs *fs);
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static int ext2fs_find_disk_blocks(ib_params *, ino_t,
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int (*)(ib_params *, void *, uint64_t, uint32_t), void *);
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static int ext2fs_findstage2_ino(ib_params *, void *, uint64_t, uint32_t);
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static int ext2fs_findstage2_blocks(ib_params *, void *, uint64_t,
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uint32_t);
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/* This reads a disk block from the file system. */
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/* XXX: should be shared with ffs.c? */
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static int
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ext2fs_read_disk_block(ib_params *params, uint64_t blkno, int size,
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uint8_t blk[])
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{
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int rv;
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assert(params != NULL);
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assert(params->filesystem != NULL);
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assert(params->fsfd != -1);
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assert(size > 0);
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assert(blk != NULL);
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rv = pread(params->fsfd, blk, size, blkno * DEV_BSIZE);
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if (rv == -1) {
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warn("Reading block %llu in `%s'",
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(unsigned long long)blkno, params->filesystem);
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return 0;
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} else if (rv != size) {
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warnx("Reading block %llu in `%s': short read",
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(unsigned long long)blkno, params->filesystem);
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return 0;
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}
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return 1;
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}
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static int
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ext2fs_read_sblock(ib_params *params, struct m_ext2fs *fs)
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{
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uint8_t sbbuf[SBSIZE];
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if (ext2fs_read_disk_block(params, SBOFF / DEV_BSIZE, SBSIZE,
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sbbuf) == 0)
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e2fs_sbload((void *)sbbuf, &fs->e2fs);
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if (fs->e2fs.e2fs_magic != E2FS_MAGIC)
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return 0;
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if (fs->e2fs.e2fs_rev > E2FS_REV1 ||
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(fs->e2fs.e2fs_rev == E2FS_REV1 &&
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(fs->e2fs.e2fs_first_ino != EXT2_FIRSTINO ||
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fs->e2fs.e2fs_inode_size != EXT2_DINODE_SIZE ||
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(fs->e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) != 0)))
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return 0;
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fs->e2fs_ncg =
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howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
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fs->e2fs.e2fs_bpg);
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/* XXX assume hw bsize = 512 */
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fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
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fs->e2fs_bsize = MINBSIZE << fs->e2fs.e2fs_log_bsize;
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fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
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fs->e2fs_qbmask = fs->e2fs_bsize - 1;
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fs->e2fs_bmask = ~fs->e2fs_qbmask;
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fs->e2fs_ngdb =
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howmany(fs->e2fs_ncg, fs->e2fs_bsize / sizeof(struct ext2_gd));
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fs->e2fs_ipb = fs->e2fs_bsize / EXT2_DINODE_SIZE;
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fs->e2fs_itpg = fs->e2fs.e2fs_ipg / fs->e2fs_ipb;
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return 1;
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}
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static int
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ext2fs_read_gdblock(ib_params *params, struct m_ext2fs *fs)
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{
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uint8_t gdbuf[MAXBSIZE];
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uint32_t gdpb;
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int i;
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gdpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
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for (i = 0; i < fs->e2fs_ngdb; i++) {
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if (ext2fs_read_disk_block(params, fsbtodb(fs,
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fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i),
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SBSIZE, gdbuf) == 0)
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return 0;
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e2fs_cgload((struct ext2_gd *)gdbuf, &fs->e2fs_gd[gdpb * i],
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(i == (fs->e2fs_ngdb - 1)) ?
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(fs->e2fs_ncg - gdpb * i) * sizeof(struct ext2_gd):
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fs->e2fs_bsize);
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}
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return 1;
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}
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/*
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* This iterates over the data blocks belonging to an inode,
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* making a callback each iteration with the disk block number
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* and the size.
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*/
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static int
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ext2fs_find_disk_blocks(ib_params *params, ino_t ino,
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int (*callback)(ib_params *, void *, uint64_t, uint32_t),
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void *state)
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{
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uint8_t sbbuf[sizeof(struct m_ext2fs)];
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struct m_ext2fs *fs;
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uint8_t inodebuf[MAXBSIZE];
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struct ext2fs_dinode inode_store, *inode;
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int level_i;
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int32_t blk, lblk, nblk;
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int rv;
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#define LEVELS 4
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struct {
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uint32_t *blknums;
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unsigned long blkcount;
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uint8_t diskbuf[MAXBSIZE];
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} level[LEVELS];
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assert(params != NULL);
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assert(params->fstype != NULL);
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assert(callback != NULL);
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assert(state != NULL);
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/* Read the superblock. */
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fs = (void *)sbbuf;
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if (ext2fs_read_sblock(params, fs) == 0)
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return 0;
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fs->e2fs_gd = malloc(sizeof(struct ext2_gd) * fs->e2fs_ncg);
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if (fs->e2fs_gd == NULL) {
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warnx("Can't allocate memofy for group descriptors");
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return 0;
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}
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if (ext2fs_read_gdblock(params, fs) == 0) {
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warnx("Can't read group descriptors");
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return 0;
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}
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if (fs->e2fs_ipb <= 0) {
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warnx("Bad ipb %d in superblock in `%s'",
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fs->e2fs_ipb, params->filesystem);
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return 0;
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}
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/* Read the inode. */
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if (ext2fs_read_disk_block(params,
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fsbtodb(fs, ino_to_fsba(fs, ino)) + params->fstype->offset,
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fs->e2fs_bsize, inodebuf))
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return 0;
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inode = (void *)inodebuf;
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e2fs_iload(&inode[ino_to_fsbo(fs, ino)], &inode_store);
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inode = &inode_store;
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/* Get the block count and initialize for our block walk. */
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nblk = howmany(inode->e2di_size, fs->e2fs_bsize);
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lblk = 0;
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level_i = 0;
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level[0].blknums = &inode->e2di_blocks[0];
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level[0].blkcount = NDADDR;
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level[1].blknums = &inode->e2di_blocks[NDADDR + 0];
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level[1].blkcount = 1;
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level[2].blknums = &inode->e2di_blocks[NDADDR + 1];
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level[2].blkcount = 1;
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level[3].blknums = &inode->e2di_blocks[NDADDR + 2];
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level[3].blkcount = 1;
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/* Walk the data blocks. */
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while (nblk > 0) {
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/*
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* If there are no more blocks at this indirection
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* level, move up one indirection level and loop.
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*/
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if (level[level_i].blkcount == 0) {
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if (++level_i == LEVELS)
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break;
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continue;
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}
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/* Get the next block at this level. */
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blk = fs2h32(*(level[level_i].blknums++));
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level[level_i].blkcount--;
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#if 0
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fprintf(stderr, "ino %lu blk %lu level %d\n", ino, blk,
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level_i);
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#endif
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/*
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* If we're not at the direct level, descend one
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* level, read in that level's new block list,
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* and loop.
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*/
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if (level_i > 0) {
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level_i--;
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if (blk == 0)
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memset(level[level_i].diskbuf, 0, MAXBSIZE);
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else if (ext2fs_read_disk_block(params,
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fsbtodb(fs, blk) + params->fstype->offset,
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fs->e2fs_bsize, level[level_i].diskbuf) == 0)
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return 0;
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/* XXX ondisk32 */
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level[level_i].blknums =
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(uint32_t *)level[level_i].diskbuf;
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level[level_i].blkcount = NINDIR(fs);
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continue;
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}
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/* blk is the next direct level block. */
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#if 0
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fprintf(stderr, "ino %lu db %lu blksize %lu\n", ino,
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fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk));
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#endif
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rv = (*callback)(params, state,
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fsbtodb(fs, blk) + params->fstype->offset, fs->e2fs_bsize);
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lblk++;
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nblk--;
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if (rv != 1)
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return rv;
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}
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if (nblk != 0) {
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warnx("Inode %llu in `%s' ran out of blocks?",
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(unsigned long long)ino, params->filesystem);
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return 0;
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}
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return 1;
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}
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/*
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* This callback reads a block of the root directory,
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* searches for an entry for the secondary bootstrap,
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* and saves the inode number if one is found.
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*/
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static int
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ext2fs_findstage2_ino(ib_params *params, void *_ino,
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uint64_t blk, uint32_t blksize)
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{
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uint8_t dirbuf[MAXBSIZE];
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struct ext2fs_direct *de, *ede;
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uint32_t ino;
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assert(params != NULL);
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assert(params->fstype != NULL);
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assert(params->stage2 != NULL);
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assert(_ino != NULL);
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/* Skip directory holes. */
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if (blk == 0)
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return 1;
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/* Read the directory block. */
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if (ext2fs_read_disk_block(params, blk, blksize, dirbuf) == 0)
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return 0;
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/* Loop over the directory entries. */
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de = (struct ext2fs_direct *)&dirbuf[0];
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ede = (struct ext2fs_direct *)&dirbuf[blksize];
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while (de < ede) {
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ino = fs2h32(de->e2d_ino);
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if (ino != 0 && strcmp(de->e2d_name, params->stage2) == 0) {
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*((uint32_t *)_ino) = ino;
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return (2);
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}
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if (fs2h16(de->e2d_reclen) == 0)
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break;
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de = (struct ext2fs_direct *)((char *)de +
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fs2h16(de->e2d_reclen));
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}
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return 1;
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}
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struct findblks_state {
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uint32_t maxblk;
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uint32_t nblk;
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ib_block *blocks;
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};
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/* This callback records the blocks of the secondary bootstrap. */
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static int
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ext2fs_findstage2_blocks(ib_params *params, void *_state,
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uint64_t blk, uint32_t blksize)
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{
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struct findblks_state *state = _state;
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assert(params != NULL);
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assert(params->stage2 != NULL);
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assert(_state != NULL);
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if (state->nblk == state->maxblk) {
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warnx("Secondary bootstrap `%s' has too many blocks (max %d)",
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params->stage2, state->maxblk);
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return (0);
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}
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state->blocks[state->nblk].block = blk;
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state->blocks[state->nblk].blocksize = blksize;
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state->nblk++;
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return 1;
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}
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/*
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* publicly visible functions
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*/
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int
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ext2fs_match(ib_params *params)
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{
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uint8_t sbbuf[sizeof(struct m_ext2fs)];
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struct m_ext2fs *fs;
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assert(params != NULL);
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assert(params->fstype != NULL);
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/* Read the superblock. */
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fs = (void *)sbbuf;
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if (ext2fs_read_sblock(params, fs) == 0)
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return 0;
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params->fstype->needswap = 0;
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params->fstype->blocksize = fs->e2fs_bsize;
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params->fstype->offset = 0;
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return 1;
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}
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int
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ext2fs_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks)
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{
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int rv;
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uint32_t ino;
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struct findblks_state state;
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assert(params != NULL);
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assert(params->stage2 != NULL);
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assert(maxblk != NULL);
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assert(blocks != NULL);
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if (params->flags & IB_STAGE2START)
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return hardcode_stage2(params, maxblk, blocks);
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/* The secondary bootstrap must be clearly in /. */
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if (params->stage2[0] == '/')
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params->stage2++;
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if (strchr(params->stage2, '/') != NULL) {
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warnx("The secondary bootstrap `%s' must be in /",
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params->stage2);
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return 0;
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}
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/* Get the inode number of the secondary bootstrap. */
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rv = ext2fs_find_disk_blocks(params, EXT2_ROOTINO,
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ext2fs_findstage2_ino, &ino);
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if (rv != 2) {
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warnx("Could not find secondary bootstrap `%s' in `%s'",
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params->stage2, params->filesystem);
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return 0;
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}
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/* Record the disk blocks of the secondary bootstrap. */
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state.maxblk = *maxblk;
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state.nblk = 0;
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state.blocks = blocks;
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rv = ext2fs_find_disk_blocks(params, ino,
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ext2fs_findstage2_blocks, &state);
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if (rv == 0)
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return 0;
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*maxblk = state.nblk;
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return 1;
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}
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