4da2d6da3a
the secondary boot is stored to embed them into the primary bootxx) for ext2fs. Currently disabled because there is no primary boot block which supports ext2fs, but it might help someone in some day.
477 lines
13 KiB
C
477 lines
13 KiB
C
/* $NetBSD: ext2fs.c,v 1.1 2008/02/02 17:01:03 tsutsui 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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* 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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 1.1 2008/02/02 17:01:03 tsutsui 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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