1459 lines
44 KiB
C
1459 lines
44 KiB
C
/* $NetBSD: mke2fs.c,v 1.14 2010/09/10 15:51:20 tsutsui Exp $ */
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/*-
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* Copyright (c) 2007 Izumi Tsutsui. All rights reserved.
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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 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) 1980, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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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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*
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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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/* mmap/munmap are used in this file just to allocate/free memory
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* so these functions are ok.
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*/
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#define mmap minix_mmap
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#define munmap minix_munmap
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/*
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* mke2fs.c: "re-invent (dumb but non-GPLed) wheel as a fun project"
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*
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* In spite of this name, there is no piece of code
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* derived from GPLed e2fsprogs written for Linux.
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* I referred them only to see how each structure
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* member should be initialized.
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*
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* Reference:
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* - All NetBSD sources under src/sys/ufs/ext2fs and src/sbin/fsck_ext2fs
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* - Ext2fs Home Page
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* http://e2fsprogs.sourceforge.net/ext2.html
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* - Design and Implementation of the Second Extended Filesystem
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* http://e2fsprogs.sourceforge.net/ext2intro.html
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* - Linux Documentation "The Second Extended Filesystem"
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* http://www.kernel.org/doc/Documentation/filesystems/ext2.txt
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mkfs.c 8.11 (Berkeley) 5/3/95";
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#else
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__RCSID("$NetBSD: mke2fs.c,v 1.14 2010/09/10 15:51:20 tsutsui Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/time.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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#include <sys/ioctl.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <uuid.h>
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#include <assert.h>
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#include <minix/termios.h>
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#include "extern.h"
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static void initcg(uint);
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static void zap_old_sblock(daddr_t);
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static uint cgoverhead(uint);
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static int fsinit(const struct timeval *);
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static int makedir(struct ext2fs_direct *, int);
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static void copy_dir(struct ext2fs_direct *, struct ext2fs_direct *);
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static void init_resizeino(const struct timeval *);
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static uint32_t alloc(uint32_t, uint16_t);
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static void iput(struct ext2fs_dinode *, ino_t);
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static void rdfs(daddr_t, int, void *);
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static void wtfs(daddr_t, int, void *);
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static int ilog2(uint);
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static int skpc(int, size_t, uint8_t *);
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/* XXX: some of these macro should be into <ufs/ext2fs/ext2fs.h>? */
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#define EXT2_DEF_MAX_MNT_COUNT 20
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#define EXT2_DEF_FSCKINTV (180 * 24 * 60 * 60) /* 180 days */
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#define EXT2_RESERVED_INODES (EXT2_FIRSTINO - 1)
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#define EXT2_UMASK 0755
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#define EXT2_INO_INDEX(ino) ((ino) - 1) /* no inode zero */
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#define EXT2_LOSTFOUNDSIZE 16384
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#define EXT2_LOSTFOUNDINO EXT2_FIRSTINO /* XXX: not quite */
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#define EXT2_LOSTFOUNDUMASK 0700
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#define EXT2_RESIZEINOUMASK 0600
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#define NBLOCK_SUPERBLOCK 1
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#define NBLOCK_BLOCK_BITMAP 1
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#define NBLOCK_INODE_BITMAP 1
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#define cgbase(fs, c) \
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((fs)->e2fs.e2fs_first_dblock + (fs)->e2fs.e2fs_bpg * (c))
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/*
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* ext2fs super block and group descriptor structures
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*
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* We don't have to use or setup whole in-memory m_ext2fs structure,
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* but prepare it to use several macro defined in kernel headers.
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*/
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union {
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struct m_ext2fs m_ext2fs;
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char pad[SBSIZE];
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} ext2fsun;
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#define sblock ext2fsun.m_ext2fs
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#define gd ext2fsun.m_ext2fs.e2fs_gd
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static uint8_t *iobuf; /* for superblock and group descriptors */
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static int iobufsize;
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static uint8_t buf[MAXBSIZE]; /* for initcg() and makedir() ops */
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static int fsi = -1, fso = -1;
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void
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mke2fs(const char *fsys, int fi, int fo)
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{
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struct timeval tv;
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int64_t minfssize;
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uint bcount, fbcount, ficount;
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uint blocks_gd, blocks_per_cg, inodes_per_cg, iblocks_per_cg;
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uint minblocks_per_cg, blocks_lastcg;
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uint ncg, cylno, sboff;
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uuid_t uuid;
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uint32_t uustat;
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int i, len, col, delta, fld_width, max_cols;
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struct winsize winsize;
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gettimeofday(&tv, NULL);
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fsi = fi;
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fso = fo;
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/*
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* collect and verify the block and fragment sizes
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*/
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if (!powerof2(bsize)) {
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errx(EXIT_FAILURE,
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"block size must be a power of 2, not %u\n",
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bsize);
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}
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if (!powerof2(fsize)) {
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errx(EXIT_FAILURE,
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"fragment size must be a power of 2, not %u\n",
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fsize);
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}
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if (fsize < sectorsize) {
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errx(EXIT_FAILURE,
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"fragment size %u is too small, minimum is %u\n",
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fsize, sectorsize);
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}
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if (bsize < MINBSIZE) {
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errx(EXIT_FAILURE,
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"block size %u is too small, minimum is %u\n",
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bsize, MINBSIZE);
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}
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if (bsize > EXT2_MAXBSIZE) {
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errx(EXIT_FAILURE,
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"block size %u is too large, maximum is %u\n",
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bsize, MAXBSIZE);
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}
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if (bsize != fsize) {
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/*
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* There is no fragment support on current ext2fs (yet?),
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* but some kernel code refers fsize or fpg as bsize or bpg
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* and Linux seems to set the same values to them.
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*/
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errx(EXIT_FAILURE,
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"block size (%u) can't be different from "
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"fragment size (%u)\n",
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bsize, fsize);
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}
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/* variable inodesize is REV1 feature */
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if (Oflag == 0 && inodesize != EXT2_REV0_DINODE_SIZE) {
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errx(EXIT_FAILURE, "GOOD_OLD_REV file system format"
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" doesn't support %d byte inode\n", inodesize);
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}
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sblock.e2fs.e2fs_log_bsize = ilog2(bsize) - LOG_MINBSIZE;
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/* Umm, why not e2fs_log_fsize? */
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sblock.e2fs.e2fs_fsize = ilog2(fsize) - LOG_MINBSIZE;
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sblock.e2fs_bsize = bsize;
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sblock.e2fs_bshift = sblock.e2fs.e2fs_log_bsize + LOG_MINBSIZE;
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sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
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sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
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sblock.e2fs_fsbtodb = ilog2(sblock.e2fs_bsize) - ilog2(sectorsize);
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sblock.e2fs_ipb = sblock.e2fs_bsize / inodesize;
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/*
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* Ext2fs preserves BBSIZE (1024 bytes) space at the top for
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* bootloader (though it is not enough at all for our bootloader).
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* If bsize == BBSIZE we have to preserve one block.
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* If bsize > BBSIZE, the first block already contains BBSIZE space
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* before superblock because superblock is allocated at SBOFF and
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* bsize is a power of two (i.e. 2048 bytes or more).
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*/
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sblock.e2fs.e2fs_first_dblock = (sblock.e2fs_bsize > BBSIZE) ? 0 : 1;
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minfssize = fsbtodb(&sblock,
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sblock.e2fs.e2fs_first_dblock +
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NBLOCK_SUPERBLOCK +
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1 /* at least one group descriptor */ +
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NBLOCK_BLOCK_BITMAP +
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NBLOCK_INODE_BITMAP +
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1 /* at least one inode table block */ +
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1 /* at least one data block for rootdir */ +
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1 /* at least one data block for data */
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); /* XXX and more? */
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if (fssize < minfssize)
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errx(EXIT_FAILURE, "Filesystem size %" PRId64
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" < minimum size of %" PRId64 "\n", fssize, minfssize);
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bcount = dbtofsb(&sblock, fssize);
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/*
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* While many people claim that ext2fs is a (bad) clone of ufs/ffs,
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* it isn't actual ffs so maybe we should call it "block group"
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* as their native name rather than ffs derived "cylinder group."
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* But we'll use the latter here since other kernel sources use it.
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* (I also agree "cylinder" based allocation is obsolete though)
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*/
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/* maybe "simple is the best" */
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blocks_per_cg = sblock.e2fs_bsize * NBBY;
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ncg = howmany(bcount - sblock.e2fs.e2fs_first_dblock, blocks_per_cg);
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blocks_gd = howmany(sizeof(struct ext2_gd) * ncg, bsize);
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/* check range of inode number */
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if (num_inodes < EXT2_FIRSTINO)
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num_inodes = EXT2_FIRSTINO; /* needs reserved inodes + 1 */
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if (num_inodes > UINT16_MAX * ncg)
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num_inodes = UINT16_MAX * ncg; /* ext2bgd_nifree is uint16_t */
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inodes_per_cg = num_inodes / ncg;
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iblocks_per_cg = howmany(inodesize * inodes_per_cg, bsize);
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/* Check that the last cylinder group has enough space for inodes */
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minblocks_per_cg =
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NBLOCK_BLOCK_BITMAP +
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NBLOCK_INODE_BITMAP +
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iblocks_per_cg +
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1; /* at least one data block */
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if (Oflag == 0 || cg_has_sb(ncg - 1) != 0)
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minblocks_per_cg += NBLOCK_SUPERBLOCK + blocks_gd;
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blocks_lastcg = bcount - sblock.e2fs.e2fs_first_dblock -
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blocks_per_cg * (ncg - 1);
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if (blocks_lastcg < minblocks_per_cg) {
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/*
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* Since we make all the cylinder groups the same size, the
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* last will only be small if there are more than one
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* cylinder groups. If the last one is too small to store
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* filesystem data, just kill it.
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*
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* XXX: Does fsck_ext2fs(8) properly handle this case?
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*/
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bcount -= blocks_lastcg;
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ncg--;
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blocks_lastcg = blocks_per_cg;
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blocks_gd = howmany(sizeof(struct ext2_gd) * ncg, bsize);
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inodes_per_cg = num_inodes / ncg;
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}
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/* roundup inodes_per_cg to make it use whole inode table blocks */
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inodes_per_cg = roundup(inodes_per_cg, sblock.e2fs_ipb);
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num_inodes = inodes_per_cg * ncg;
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iblocks_per_cg = inodes_per_cg / sblock.e2fs_ipb;
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/* XXX: probably we should check these adjusted values again */
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sblock.e2fs.e2fs_bcount = bcount;
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sblock.e2fs.e2fs_icount = num_inodes;
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sblock.e2fs_ncg = ncg;
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sblock.e2fs_ngdb = blocks_gd;
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sblock.e2fs_itpg = iblocks_per_cg;
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sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * minfree / 100;
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/* e2fs_fbcount will be accounted later */
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/* e2fs_ficount will be accounted later */
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sblock.e2fs.e2fs_bpg = blocks_per_cg;
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sblock.e2fs.e2fs_fpg = blocks_per_cg;
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sblock.e2fs.e2fs_ipg = inodes_per_cg;
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sblock.e2fs.e2fs_mtime = 0;
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sblock.e2fs.e2fs_wtime = tv.tv_sec;
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sblock.e2fs.e2fs_mnt_count = 0;
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/* XXX: should add some entropy to avoid checking all fs at once? */
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sblock.e2fs.e2fs_max_mnt_count = EXT2_DEF_MAX_MNT_COUNT;
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sblock.e2fs.e2fs_magic = E2FS_MAGIC;
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sblock.e2fs.e2fs_state = E2FS_ISCLEAN;
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sblock.e2fs.e2fs_beh = E2FS_BEH_DEFAULT;
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sblock.e2fs.e2fs_minrev = 0;
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sblock.e2fs.e2fs_lastfsck = tv.tv_sec;
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sblock.e2fs.e2fs_fsckintv = EXT2_DEF_FSCKINTV;
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/*
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* Maybe we can use E2FS_OS_FREEBSD here and it would be more proper,
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* but the purpose of this newfs_ext2fs(8) command is to provide
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* a filesystem which can be recognized by firmware on some
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* Linux based appliances that can load bootstrap files only from
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* (their native) ext2fs, and anyway we will (and should) try to
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* act like them as much as possible.
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*
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* Anyway, I hope that all newer such boxes will keep their support
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* for the "GOOD_OLD_REV" ext2fs.
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*/
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sblock.e2fs.e2fs_creator = E2FS_OS_LINUX;
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if (Oflag == 0) {
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sblock.e2fs.e2fs_rev = E2FS_REV0;
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sblock.e2fs.e2fs_features_compat = 0;
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sblock.e2fs.e2fs_features_incompat = 0;
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sblock.e2fs.e2fs_features_rocompat = 0;
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} else {
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sblock.e2fs.e2fs_rev = E2FS_REV1;
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/*
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* e2fsprogs say "REV1" is "dynamic" so
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* it isn't quite a version and maybe it means
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* "extended from REV0 so check compat features."
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*
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* XXX: We don't have any native tool to activate
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* the EXT2F_COMPAT_RESIZE feature and
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* fsck_ext2fs(8) might not fix structures for it.
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*/
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sblock.e2fs.e2fs_features_compat = EXT2F_COMPAT_RESIZE;
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sblock.e2fs.e2fs_features_incompat = EXT2F_INCOMPAT_FTYPE;
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sblock.e2fs.e2fs_features_rocompat =
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EXT2F_ROCOMPAT_SPARSESUPER | EXT2F_ROCOMPAT_LARGEFILE;
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}
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sblock.e2fs.e2fs_ruid = geteuid();
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sblock.e2fs.e2fs_rgid = getegid();
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sblock.e2fs.e2fs_first_ino = EXT2_FIRSTINO;
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sblock.e2fs.e2fs_inode_size = inodesize;
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/* e2fs_block_group_nr is set on writing superblock to each group */
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uuid_create(&uuid, &uustat);
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if (uustat != uuid_s_ok)
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errx(EXIT_FAILURE, "Failed to generate uuid\n");
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uuid_enc_le(sblock.e2fs.e2fs_uuid, &uuid);
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if (volname != NULL) {
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if (strlen(volname) > sizeof(sblock.e2fs.e2fs_vname))
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errx(EXIT_FAILURE, "Volume name is too long");
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strlcpy(sblock.e2fs.e2fs_vname, volname,
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sizeof(sblock.e2fs.e2fs_vname));
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}
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|
|
sblock.e2fs.e2fs_fsmnt[0] = '\0';
|
|
sblock.e2fs_fsmnt[0] = '\0';
|
|
|
|
sblock.e2fs.e2fs_algo = 0; /* XXX unsupported? */
|
|
sblock.e2fs.e2fs_prealloc = 0; /* XXX unsupported? */
|
|
sblock.e2fs.e2fs_dir_prealloc = 0; /* XXX unsupported? */
|
|
|
|
/* calculate blocks for reserved group descriptors for resize */
|
|
sblock.e2fs.e2fs_reserved_ngdb = 0;
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
(sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0) {
|
|
uint64_t target_blocks;
|
|
uint target_ncg, target_ngdb, reserved_ngdb;
|
|
|
|
/* reserve descriptors for size as 1024 times as current */
|
|
target_blocks =
|
|
(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock)
|
|
* 1024ULL;
|
|
/* number of blocks must be in uint32_t */
|
|
if (target_blocks > UINT32_MAX)
|
|
target_blocks = UINT32_MAX;
|
|
target_ncg = howmany(target_blocks, sblock.e2fs.e2fs_bpg);
|
|
target_ngdb = howmany(sizeof(struct ext2_gd) * target_ncg,
|
|
sblock.e2fs_bsize);
|
|
/*
|
|
* Reserved group descriptor blocks are preserved as
|
|
* the second level double indirect reference blocks in
|
|
* the EXT2_RESIZEINO inode, so the maximum number of
|
|
* the blocks is NINDIR(fs).
|
|
* (see also descriptions in init_resizeino() function)
|
|
*
|
|
* We check a number including current e2fs_ngdb here
|
|
* because they will be moved into reserved gdb on
|
|
* possible future size shrink, though e2fsprogs don't
|
|
* seem to care about it.
|
|
*/
|
|
if (target_ngdb > NINDIR(&sblock))
|
|
target_ngdb = NINDIR(&sblock);
|
|
|
|
reserved_ngdb = target_ngdb - sblock.e2fs_ngdb;
|
|
|
|
/* make sure reserved_ngdb fits in the last cg */
|
|
if (reserved_ngdb >= blocks_lastcg - cgoverhead(ncg - 1))
|
|
reserved_ngdb = blocks_lastcg - cgoverhead(ncg - 1);
|
|
if (reserved_ngdb == 0) {
|
|
/* if no space for reserved gdb, disable the feature */
|
|
sblock.e2fs.e2fs_features_compat &=
|
|
~EXT2F_COMPAT_RESIZE;
|
|
}
|
|
sblock.e2fs.e2fs_reserved_ngdb = reserved_ngdb;
|
|
}
|
|
|
|
/*
|
|
* Initialize group descriptors
|
|
*/
|
|
gd = malloc(sblock.e2fs_ngdb * bsize);
|
|
if (gd == NULL)
|
|
errx(EXIT_FAILURE, "Can't allocate descriptors buffer");
|
|
memset(gd, 0, sblock.e2fs_ngdb * bsize);
|
|
|
|
fbcount = 0;
|
|
ficount = 0;
|
|
for (cylno = 0; cylno < ncg; cylno++) {
|
|
uint boffset;
|
|
|
|
boffset = cgbase(&sblock, cylno);
|
|
if (sblock.e2fs.e2fs_rev == E2FS_REV0 ||
|
|
(sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_SPARSESUPER) == 0 ||
|
|
cg_has_sb(cylno)) {
|
|
boffset += NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb;
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
(sblock.e2fs.e2fs_features_compat &
|
|
EXT2F_COMPAT_RESIZE) != 0)
|
|
boffset += sblock.e2fs.e2fs_reserved_ngdb;
|
|
}
|
|
gd[cylno].ext2bgd_b_bitmap = boffset;
|
|
boffset += NBLOCK_BLOCK_BITMAP;
|
|
gd[cylno].ext2bgd_i_bitmap = boffset;
|
|
boffset += NBLOCK_INODE_BITMAP;
|
|
gd[cylno].ext2bgd_i_tables = boffset;
|
|
if (cylno == (ncg - 1))
|
|
gd[cylno].ext2bgd_nbfree =
|
|
blocks_lastcg - cgoverhead(cylno);
|
|
else
|
|
gd[cylno].ext2bgd_nbfree =
|
|
sblock.e2fs.e2fs_bpg - cgoverhead(cylno);
|
|
fbcount += gd[cylno].ext2bgd_nbfree;
|
|
gd[cylno].ext2bgd_nifree = sblock.e2fs.e2fs_ipg;
|
|
if (cylno == 0) {
|
|
/* take reserved inodes off nifree */
|
|
gd[cylno].ext2bgd_nifree -= EXT2_RESERVED_INODES;
|
|
}
|
|
ficount += gd[cylno].ext2bgd_nifree;
|
|
gd[cylno].ext2bgd_ndirs = 0;
|
|
}
|
|
sblock.e2fs.e2fs_fbcount = fbcount;
|
|
sblock.e2fs.e2fs_ficount = ficount;
|
|
|
|
/*
|
|
* Dump out summary information about file system.
|
|
*/
|
|
if (verbosity > 0) {
|
|
printf("%s: %u.%1uMB (%" PRId64 " sectors) "
|
|
"block size %u, fragment size %u\n",
|
|
fsys,
|
|
(uint)(((uint64_t)bcount * bsize) / (1024 * 1024)),
|
|
(uint)((uint64_t)bcount * bsize -
|
|
rounddown((uint64_t)bcount * bsize, 1024 * 1024))
|
|
/ 1024 / 100,
|
|
fssize, bsize, fsize);
|
|
printf("\tusing %u block groups of %u.0MB, %u blks, "
|
|
"%u inodes.\n",
|
|
ncg, bsize * sblock.e2fs.e2fs_bpg / (1024 * 1024),
|
|
sblock.e2fs.e2fs_bpg, sblock.e2fs.e2fs_ipg);
|
|
}
|
|
|
|
/*
|
|
* allocate space for superblock and group descriptors
|
|
*/
|
|
iobufsize = (NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb) * sblock.e2fs_bsize;
|
|
iobuf = mmap(0, iobufsize, PROT_READ|PROT_WRITE,
|
|
MAP_ANON|MAP_PRIVATE, -1, 0);
|
|
if (iobuf == NULL)
|
|
errx(EXIT_FAILURE, "Cannot allocate I/O buffer\n");
|
|
memset(iobuf, 0, iobufsize);
|
|
|
|
/*
|
|
* We now start writing to the filesystem
|
|
*/
|
|
|
|
if (!Nflag) {
|
|
static const uint pbsize[] = { 1024, 2048, 4096, 0 };
|
|
uint pblock, epblock;
|
|
/*
|
|
* Validate the given file system size.
|
|
* Verify that its last block can actually be accessed.
|
|
* Convert to file system fragment sized units.
|
|
*/
|
|
if (fssize <= 0)
|
|
errx(EXIT_FAILURE, "Preposterous size %" PRId64 "\n",
|
|
fssize);
|
|
wtfs(fssize - 1, sectorsize, iobuf);
|
|
|
|
/*
|
|
* Ensure there is nothing that looks like a filesystem
|
|
* superblock anywhere other than where ours will be.
|
|
* If fsck_ext2fs finds the wrong one all hell breaks loose!
|
|
*
|
|
* XXX: needs to check how fsck_ext2fs programs even
|
|
* on other OSes determine alternate superblocks
|
|
*/
|
|
for (i = 0; pbsize[i] != 0; i++) {
|
|
epblock = (uint64_t)bcount * bsize / pbsize[i];
|
|
for (pblock = ((pbsize[i] == SBSIZE) ? 1 : 0);
|
|
pblock < epblock;
|
|
pblock += pbsize[i] * NBBY /* bpg */)
|
|
zap_old_sblock((daddr_t)pblock *
|
|
pbsize[i] / sectorsize);
|
|
}
|
|
}
|
|
|
|
if (verbosity >= 3)
|
|
printf("super-block backups (for fsck_ext2fs -b #) at:\n");
|
|
/* If we are printing more than one line of numbers, line up columns */
|
|
fld_width = verbosity < 4 ? 1 : snprintf(NULL, 0, "%" PRIu64,
|
|
(uint64_t)cgbase(&sblock, ncg - 1));
|
|
/* Get terminal width */
|
|
if (ioctl(fileno(stdout), TIOCGWINSZ, &winsize) == 0)
|
|
max_cols = winsize.ws_col;
|
|
else
|
|
max_cols = 80;
|
|
if (Nflag && verbosity == 3)
|
|
/* Leave space to add " ..." after one row of numbers */
|
|
max_cols -= 4;
|
|
#define BASE 0x10000 /* For some fixed-point maths */
|
|
col = 0;
|
|
delta = verbosity > 2 ? 0 : max_cols * BASE / ncg;
|
|
for (cylno = 0; cylno < ncg; cylno++) {
|
|
fflush(stdout);
|
|
initcg(cylno);
|
|
if (verbosity < 2)
|
|
continue;
|
|
/* the first one is a master, not backup */
|
|
if (cylno == 0)
|
|
continue;
|
|
/* skip if this cylinder doesn't have a backup */
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
(sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_SPARSESUPER) != 0 &&
|
|
cg_has_sb(cylno) == 0)
|
|
continue;
|
|
|
|
if (delta > 0) {
|
|
if (Nflag)
|
|
/* No point doing dots for -N */
|
|
break;
|
|
/* Print dots scaled to end near RH margin */
|
|
for (col += delta; col > BASE; col -= BASE)
|
|
printf(".");
|
|
continue;
|
|
}
|
|
/* Print superblock numbers */
|
|
len = printf(" %*" PRIu64 "," + !col, fld_width,
|
|
(uint64_t)cgbase(&sblock, cylno));
|
|
col += len;
|
|
if (col + len < max_cols)
|
|
/* Next number fits */
|
|
continue;
|
|
/* Next number won't fit, need a newline */
|
|
if (verbosity <= 3) {
|
|
/* Print dots for subsequent cylinder groups */
|
|
delta = sblock.e2fs_ncg - cylno - 1;
|
|
if (delta != 0) {
|
|
if (Nflag) {
|
|
printf(" ...");
|
|
break;
|
|
}
|
|
delta = max_cols * BASE / delta;
|
|
}
|
|
}
|
|
col = 0;
|
|
printf("\n");
|
|
}
|
|
#undef BASE
|
|
if (col > 0)
|
|
printf("\n");
|
|
if (Nflag)
|
|
return;
|
|
|
|
/*
|
|
* Now construct the initial file system,
|
|
*/
|
|
if (fsinit(&tv) == 0)
|
|
errx(EXIT_FAILURE, "Error making filesystem");
|
|
/*
|
|
* Write out the superblock and group descriptors
|
|
*/
|
|
sblock.e2fs.e2fs_block_group_nr = 0;
|
|
sboff = 0;
|
|
if (cgbase(&sblock, 0) == 0) {
|
|
/*
|
|
* If the first block contains the boot block sectors,
|
|
* (i.e. in case of sblock.e2fs.e2fs_bsize > BBSIZE)
|
|
* we have to preserve data in it.
|
|
*/
|
|
sboff = SBOFF;
|
|
}
|
|
e2fs_sbsave(&sblock.e2fs, (struct ext2fs *)(iobuf + sboff));
|
|
e2fs_cgsave(gd, (struct ext2_gd *)(iobuf + sblock.e2fs_bsize),
|
|
sizeof(struct ext2_gd) * sblock.e2fs_ncg);
|
|
wtfs(fsbtodb(&sblock, cgbase(&sblock, 0)) + sboff / sectorsize,
|
|
iobufsize - sboff, iobuf + sboff);
|
|
|
|
munmap(iobuf, iobufsize);
|
|
}
|
|
|
|
/*
|
|
* Initialize a cylinder (block) group.
|
|
*/
|
|
void
|
|
initcg(uint cylno)
|
|
{
|
|
uint nblcg, i, j, sboff;
|
|
struct ext2fs_dinode *dp;
|
|
|
|
/*
|
|
* Make a copy of the superblock and group descriptors.
|
|
*/
|
|
if (sblock.e2fs.e2fs_rev == E2FS_REV0 ||
|
|
(sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_SPARSESUPER) == 0 ||
|
|
cg_has_sb(cylno)) {
|
|
sblock.e2fs.e2fs_block_group_nr = cylno;
|
|
sboff = 0;
|
|
if (cgbase(&sblock, cylno) == 0) {
|
|
/* preserve data in bootblock in cg0 */
|
|
sboff = SBOFF;
|
|
}
|
|
e2fs_sbsave(&sblock.e2fs, (struct ext2fs *)(iobuf + sboff));
|
|
e2fs_cgsave(gd, (struct ext2_gd *)(iobuf +
|
|
sblock.e2fs_bsize * NBLOCK_SUPERBLOCK),
|
|
sizeof(struct ext2_gd) * sblock.e2fs_ncg);
|
|
/* write superblock and group descriptor backups */
|
|
wtfs(fsbtodb(&sblock, cgbase(&sblock, cylno)) +
|
|
sboff / sectorsize, iobufsize - sboff, iobuf + sboff);
|
|
}
|
|
|
|
/*
|
|
* Initialize block bitmap.
|
|
*/
|
|
memset(buf, 0, sblock.e2fs_bsize);
|
|
if (cylno == (sblock.e2fs_ncg - 1)) {
|
|
/* The last group could have less blocks than e2fs_bpg. */
|
|
nblcg = sblock.e2fs.e2fs_bcount -
|
|
cgbase(&sblock, sblock.e2fs_ncg - 1);
|
|
for (i = nblcg; i < roundup(nblcg, NBBY); i++)
|
|
setbit(buf, i);
|
|
memset(&buf[i / NBBY], ~0U, sblock.e2fs.e2fs_bpg - i);
|
|
}
|
|
/* set overhead (superblock, group descriptor etc.) blocks used */
|
|
for (i = 0; i < cgoverhead(cylno) / NBBY; i++)
|
|
buf[i] = ~0;
|
|
i = i * NBBY;
|
|
for (; i < cgoverhead(cylno); i++)
|
|
setbit(buf, i);
|
|
wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_b_bitmap), sblock.e2fs_bsize,
|
|
buf);
|
|
|
|
/*
|
|
* Initialize inode bitmap.
|
|
*
|
|
* Assume e2fs_ipg is a multiple of NBBY since
|
|
* it's a multiple of e2fs_ipb (as we did above).
|
|
* Note even (possibly smaller) the last group has the same e2fs_ipg.
|
|
*/
|
|
assert(!(sblock.e2fs.e2fs_ipg % NBBY));
|
|
i = sblock.e2fs.e2fs_ipg / NBBY;
|
|
memset(buf, 0, i);
|
|
assert(sblock.e2fs_bsize >= i);
|
|
memset(buf + i, ~0U, sblock.e2fs_bsize - i);
|
|
if (cylno == 0) {
|
|
/* mark reserved inodes */
|
|
for (i = 1; i < EXT2_FIRSTINO; i++)
|
|
setbit(buf, EXT2_INO_INDEX(i));
|
|
}
|
|
wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_i_bitmap), sblock.e2fs_bsize,
|
|
buf);
|
|
|
|
/*
|
|
* Initialize inode tables.
|
|
*
|
|
* Just initialize generation numbers for NFS security.
|
|
* XXX: sys/ufs/ext2fs/ext2fs_alloc.c:ext2fs_valloc() seems
|
|
* to override these generated numbers.
|
|
*/
|
|
memset(buf, 0, sblock.e2fs_bsize);
|
|
for (i = 0; i < sblock.e2fs_itpg; i++) {
|
|
for (j = 0; j < sblock.e2fs_ipb; j++) {
|
|
dp = (struct ext2fs_dinode *)(buf + inodesize * j);
|
|
/* h2fs32() just for consistency */
|
|
dp->e2di_gen = h2fs32(arc4random());
|
|
}
|
|
wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_i_tables + i),
|
|
sblock.e2fs_bsize, buf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Zap possible lingering old superblock data
|
|
*/
|
|
static void
|
|
zap_old_sblock(daddr_t sec)
|
|
{
|
|
static daddr_t cg0_data;
|
|
uint32_t oldfs[SBSIZE / sizeof(uint32_t)];
|
|
static const struct fsm {
|
|
uint32_t offset;
|
|
uint32_t magic;
|
|
uint32_t mask;
|
|
} fs_magics[] = {
|
|
{offsetof(struct ext2fs, e2fs_magic) / 4, E2FS_MAGIC, 0xffff},
|
|
{offsetof(struct ext2fs, e2fs_magic) / 4,
|
|
E2FS_MAGIC << 16, 0xffff0000},
|
|
{14, 0xef530000, 0xffff0000}, /* EXT2FS (big) */
|
|
{0x55c / 4, 0x00011954, ~0U}, /* FS_UFS1_MAGIC */
|
|
{0x55c / 4, 0x19540119, ~0U}, /* FS_UFS2_MAGIC */
|
|
{0, 0x70162, ~0U}, /* LFS_MAGIC */
|
|
{.offset = ~0U},
|
|
};
|
|
const struct fsm *fsm;
|
|
|
|
if (Nflag)
|
|
return;
|
|
|
|
/* don't override data before superblock */
|
|
if (sec < SBOFF / sectorsize)
|
|
return;
|
|
|
|
if (cg0_data == 0) {
|
|
cg0_data =
|
|
((daddr_t)sblock.e2fs.e2fs_first_dblock + cgoverhead(0)) *
|
|
sblock.e2fs_bsize / sectorsize;
|
|
}
|
|
|
|
/* Ignore anything that is beyond our filesystem */
|
|
if (sec >= fssize)
|
|
return;
|
|
/* Zero anything inside our filesystem... */
|
|
if (sec >= sblock.e2fs.e2fs_first_dblock * bsize / sectorsize) {
|
|
/* ...unless we will write that area anyway */
|
|
if (sec >= cg0_data)
|
|
/* assume iobuf is zero'ed here */
|
|
wtfs(sec, roundup(SBSIZE, sectorsize), iobuf);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The sector might contain boot code, so we must validate it
|
|
*
|
|
* XXX: ext2fs won't preserve data after SBOFF,
|
|
* but first_dblock could have a different value.
|
|
*/
|
|
rdfs(sec, sizeof(oldfs), &oldfs);
|
|
for (fsm = fs_magics;; fsm++) {
|
|
uint32_t v;
|
|
if (fsm->mask == 0)
|
|
return;
|
|
v = oldfs[fsm->offset];
|
|
if ((v & fsm->mask) == fsm->magic ||
|
|
(bswap32(v) & fsm->mask) == fsm->magic)
|
|
break;
|
|
}
|
|
|
|
/* Just zap the magic number */
|
|
oldfs[fsm->offset] = 0;
|
|
wtfs(sec, sizeof(oldfs), &oldfs);
|
|
}
|
|
|
|
/*
|
|
* uint cgoverhead(uint c)
|
|
*
|
|
* Return a number of reserved blocks on the specified group.
|
|
* XXX: should be shared with src/sbin/fsck_ext2fs/setup.c
|
|
*/
|
|
uint
|
|
cgoverhead(uint c)
|
|
{
|
|
uint overh;
|
|
|
|
overh = NBLOCK_BLOCK_BITMAP + NBLOCK_INODE_BITMAP + sblock.e2fs_itpg;
|
|
|
|
if (sblock.e2fs.e2fs_rev == E2FS_REV0 ||
|
|
(sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_SPARSESUPER) == 0 ||
|
|
cg_has_sb(c) != 0) {
|
|
overh += NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb;
|
|
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
(sblock.e2fs.e2fs_features_compat &
|
|
EXT2F_COMPAT_RESIZE) != 0)
|
|
overh += sblock.e2fs.e2fs_reserved_ngdb;
|
|
}
|
|
|
|
return overh;
|
|
}
|
|
|
|
/*
|
|
* Initialize the file system
|
|
*/
|
|
|
|
#define LOSTDIR /* e2fsck complains if there is no lost+found */
|
|
|
|
#define PREDEFDIR 2
|
|
|
|
#ifdef LOSTDIR
|
|
#define PREDEFROOTDIR (PREDEFDIR + 1)
|
|
#else
|
|
#define PREDEFROOTDIR PREDEFDIR
|
|
#endif
|
|
|
|
struct ext2fs_direct root_dir[] = {
|
|
{ EXT2_ROOTINO, 0, 1, 0, "." },
|
|
{ EXT2_ROOTINO, 0, 2, 0, ".." },
|
|
#ifdef LOSTDIR
|
|
{ EXT2_LOSTFOUNDINO, 0, 10, 0, "lost+found" },
|
|
#endif
|
|
};
|
|
|
|
#ifdef LOSTDIR
|
|
struct ext2fs_direct lost_found_dir[] = {
|
|
{ EXT2_LOSTFOUNDINO, 0, 1, 0, "." },
|
|
{ EXT2_ROOTINO, 0, 2, 0, ".." },
|
|
};
|
|
struct ext2fs_direct pad_dir = { 0, sizeof(struct ext2fs_direct), 0, 0, "" };
|
|
#endif
|
|
|
|
int
|
|
fsinit(const struct timeval *tv)
|
|
{
|
|
struct ext2fs_dinode node;
|
|
#ifdef LOSTDIR
|
|
uint i, nblks_lostfound, blk;
|
|
#endif
|
|
|
|
/*
|
|
* Initialize the inode for the resizefs feature
|
|
*/
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
(sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0)
|
|
init_resizeino(tv);
|
|
|
|
/*
|
|
* Initialize the node
|
|
*/
|
|
|
|
#ifdef LOSTDIR
|
|
/*
|
|
* Create the lost+found directory
|
|
*/
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) {
|
|
lost_found_dir[0].e2d_type = EXT2_FT_DIR;
|
|
lost_found_dir[1].e2d_type = EXT2_FT_DIR;
|
|
}
|
|
(void)makedir(lost_found_dir, __arraycount(lost_found_dir));
|
|
|
|
/* prepare a bit large directory for preserved files */
|
|
nblks_lostfound = EXT2_LOSTFOUNDSIZE / sblock.e2fs_bsize;
|
|
/* ...but only with direct blocks */
|
|
if (nblks_lostfound > NDADDR)
|
|
nblks_lostfound = NDADDR;
|
|
|
|
memset(&node, 0, sizeof(node));
|
|
node.e2di_mode = EXT2_IFDIR | EXT2_LOSTFOUNDUMASK;
|
|
node.e2di_uid = geteuid();
|
|
node.e2di_size = sblock.e2fs_bsize * nblks_lostfound;
|
|
node.e2di_atime = tv->tv_sec;
|
|
node.e2di_ctime = tv->tv_sec;
|
|
node.e2di_mtime = tv->tv_sec;
|
|
node.e2di_gid = getegid();
|
|
node.e2di_nlink = PREDEFDIR;
|
|
/* e2di_nblock is a number of disk blocks, not ext2fs blocks */
|
|
node.e2di_nblock = fsbtodb(&sblock, nblks_lostfound);
|
|
node.e2di_blocks[0] = alloc(sblock.e2fs_bsize, node.e2di_mode);
|
|
if (node.e2di_blocks[0] == 0) {
|
|
printf("%s: can't allocate block for lost+found\n", __func__);
|
|
return 0;
|
|
}
|
|
for (i = 1; i < nblks_lostfound; i++) {
|
|
blk = alloc(sblock.e2fs_bsize, 0);
|
|
if (blk == 0) {
|
|
printf("%s: can't allocate blocks for lost+found\n",
|
|
__func__);
|
|
return 0;
|
|
}
|
|
node.e2di_blocks[i] = blk;
|
|
}
|
|
wtfs(fsbtodb(&sblock, node.e2di_blocks[0]), sblock.e2fs_bsize, buf);
|
|
pad_dir.e2d_reclen = sblock.e2fs_bsize;
|
|
for (i = 1; i < nblks_lostfound; i++) {
|
|
memset(buf, 0, sblock.e2fs_bsize);
|
|
copy_dir(&pad_dir, (struct ext2fs_direct *)buf);
|
|
wtfs(fsbtodb(&sblock, node.e2di_blocks[i]), sblock.e2fs_bsize,
|
|
buf);
|
|
}
|
|
iput(&node, EXT2_LOSTFOUNDINO);
|
|
#endif
|
|
/*
|
|
* create the root directory
|
|
*/
|
|
memset(&node, 0, sizeof(node));
|
|
if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
|
|
sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) {
|
|
root_dir[0].e2d_type = EXT2_FT_DIR;
|
|
root_dir[1].e2d_type = EXT2_FT_DIR;
|
|
#ifdef LOSTDIR
|
|
root_dir[2].e2d_type = EXT2_FT_DIR;
|
|
#endif
|
|
}
|
|
node.e2di_mode = EXT2_IFDIR | EXT2_UMASK;
|
|
node.e2di_uid = geteuid();
|
|
node.e2di_size = makedir(root_dir, __arraycount(root_dir));
|
|
node.e2di_atime = tv->tv_sec;
|
|
node.e2di_ctime = tv->tv_sec;
|
|
node.e2di_mtime = tv->tv_sec;
|
|
node.e2di_gid = getegid();
|
|
node.e2di_nlink = PREDEFROOTDIR;
|
|
/* e2di_nblock is a number of disk block, not ext2fs block */
|
|
node.e2di_nblock = fsbtodb(&sblock, 1);
|
|
node.e2di_blocks[0] = alloc(node.e2di_size, node.e2di_mode);
|
|
if (node.e2di_blocks[0] == 0) {
|
|
printf("%s: can't allocate block for root dir\n", __func__);
|
|
return 0;
|
|
}
|
|
wtfs(fsbtodb(&sblock, node.e2di_blocks[0]), sblock.e2fs_bsize, buf);
|
|
iput(&node, EXT2_ROOTINO);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Construct a set of directory entries in "buf".
|
|
* return size of directory.
|
|
*/
|
|
int
|
|
makedir(struct ext2fs_direct *protodir, int entries)
|
|
{
|
|
uint8_t *cp;
|
|
uint i, spcleft;
|
|
uint dirblksiz;
|
|
|
|
dirblksiz = sblock.e2fs_bsize;
|
|
memset(buf, 0, dirblksiz);
|
|
spcleft = dirblksiz;
|
|
for (cp = buf, i = 0; i < entries - 1; i++) {
|
|
protodir[i].e2d_reclen = EXT2FS_DIRSIZ(protodir[i].e2d_namlen);
|
|
copy_dir(&protodir[i], (struct ext2fs_direct *)cp);
|
|
cp += protodir[i].e2d_reclen;
|
|
spcleft -= protodir[i].e2d_reclen;
|
|
}
|
|
protodir[i].e2d_reclen = spcleft;
|
|
copy_dir(&protodir[i], (struct ext2fs_direct *)cp);
|
|
return dirblksiz;
|
|
}
|
|
|
|
/*
|
|
* Copy a direntry to a buffer, in fs byte order
|
|
*/
|
|
static void
|
|
copy_dir(struct ext2fs_direct *dir, struct ext2fs_direct *dbuf)
|
|
{
|
|
|
|
memcpy(dbuf, dir, EXT2FS_DIRSIZ(dir->e2d_namlen));
|
|
dbuf->e2d_ino = h2fs32(dir->e2d_ino);
|
|
dbuf->e2d_reclen = h2fs16(dir->e2d_reclen);
|
|
}
|
|
|
|
/*
|
|
* void init_resizeino(const struct timeval *tv);
|
|
*
|
|
* Initialize the EXT2_RESEIZE_INO inode to preserve
|
|
* reserved group descriptor blocks for future growth of this ext2fs.
|
|
*/
|
|
void
|
|
init_resizeino(const struct timeval *tv)
|
|
{
|
|
struct ext2fs_dinode node;
|
|
uint64_t isize;
|
|
uint32_t *dindir_block, *reserved_gdb;
|
|
uint nblock, i, cylno, n;
|
|
|
|
memset(&node, 0, sizeof(node));
|
|
|
|
/*
|
|
* Note this function only prepares required structures for
|
|
* future resize. It's a quite different work to implement
|
|
* a utility like resize_ext2fs(8) which handles actual
|
|
* resize ops even on offline.
|
|
*
|
|
* Anyway, I'm not sure if there is any documentation about
|
|
* this resize ext2fs feature and related data structures,
|
|
* and I've written this function based on things what I see
|
|
* on some existing implementation and real file system data
|
|
* created by existing tools. To be honest, they are not
|
|
* so easy to read, so I will try to implement it here without
|
|
* any dumb optimization for people who would eventually
|
|
* work on "yet another wheel" like resize_ext2fs(8).
|
|
*/
|
|
|
|
/*
|
|
* I'm not sure what type is appropriate for this inode.
|
|
* The release notes of e2fsprogs says they changed e2fsck to allow
|
|
* IFREG for RESIZEINO since a certain resize tool used it. Hmm.
|
|
*/
|
|
node.e2di_mode = EXT2_IFREG | EXT2_RESIZEINOUMASK;
|
|
node.e2di_uid = geteuid();
|
|
node.e2di_atime = tv->tv_sec;
|
|
node.e2di_ctime = tv->tv_sec;
|
|
node.e2di_mtime = tv->tv_sec;
|
|
node.e2di_gid = getegid();
|
|
node.e2di_nlink = 1;
|
|
|
|
/*
|
|
* To preserve the reserved group descriptor blocks,
|
|
* EXT2_RESIZEINO uses only double indirect reference
|
|
* blocks in its inode entries.
|
|
*
|
|
* All entries for direct, single indirect and triple
|
|
* indirect references are left zero'ed. Maybe it's safe
|
|
* because no write operation will happen with this inode.
|
|
*
|
|
* We have to allocate a block for the first level double
|
|
* indirect reference block. Indexes of inode entries in
|
|
* this first level dindirect block are corresponding to
|
|
* indexes of group descriptors including both used (e2fs_ngdb)
|
|
* and reserved (e2fs_reserved_ngdb) group descriptor blocks.
|
|
*
|
|
* Inode entries of indexes for used (e2fs_ngdb) descriptors are
|
|
* left zero'ed. Entries for reserved (e2fs_reserved_ngdb) ones
|
|
* have block numbers of actual reserved group descriptors
|
|
* allocated at block group zero. This means e2fs_reserved_ngdb
|
|
* blocks are reserved as the second level dindirect reference
|
|
* blocks, and they actually contain block numbers of indirect
|
|
* references. It may be safe since they don't have to keep any
|
|
* data yet.
|
|
*
|
|
* Each these second dindirect blocks (i.e. reserved group
|
|
* descriptor blocks in the first block group) should have
|
|
* block numbers of its backups in all other block groups.
|
|
* I.e. reserved_ngdb[0] block in block group 0 contains block
|
|
* numbers of resreved_ngdb[0] from group 1 through (e2fs_ncg - 1).
|
|
* The number of backups can be determined by the
|
|
* EXT2_ROCOMPAT_SPARSESUPER feature and cg_has_sb() macro
|
|
* as done in the above initcg() function.
|
|
*/
|
|
|
|
/* set e2di_size which occupies whole blocks through DINDIR blocks */
|
|
isize = (uint64_t)sblock.e2fs_bsize * NDADDR +
|
|
(uint64_t)sblock.e2fs_bsize * NINDIR(&sblock) +
|
|
(uint64_t)sblock.e2fs_bsize * NINDIR(&sblock) * NINDIR(&sblock);
|
|
if (isize > UINT32_MAX &&
|
|
(sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_LARGEFILE) == 0) {
|
|
/* XXX should enable it here and update all backups? */
|
|
errx(EXIT_FAILURE, "%s: large_file rocompat feature is "
|
|
"required to enable resize feature for this filesystem\n",
|
|
__func__);
|
|
}
|
|
/* upper 32bit is stored into e2di_dacl on REV1 feature */
|
|
node.e2di_size = isize & UINT32_MAX;
|
|
node.e2di_dacl = isize >> 32;
|
|
|
|
#define SINGLE 0 /* index of single indirect block */
|
|
#define DOUBLE 1 /* index of double indirect block */
|
|
#define TRIPLE 2 /* index of triple indirect block */
|
|
|
|
/* zero out entries for direct references */
|
|
for (i = 0; i < NDADDR; i++)
|
|
node.e2di_blocks[i] = 0;
|
|
/* also zero out entries for single and triple indirect references */
|
|
node.e2di_blocks[NDADDR + SINGLE] = 0;
|
|
node.e2di_blocks[NDADDR + TRIPLE] = 0;
|
|
|
|
/* allocate a block for the first level double indirect reference */
|
|
node.e2di_blocks[NDADDR + DOUBLE] =
|
|
alloc(sblock.e2fs_bsize, node.e2di_mode);
|
|
if (node.e2di_blocks[NDADDR + DOUBLE] == 0)
|
|
errx(EXIT_FAILURE, "%s: Can't allocate a dindirect block",
|
|
__func__);
|
|
|
|
/* account this first block */
|
|
nblock = fsbtodb(&sblock, 1);
|
|
|
|
/* allocate buffer to set data in the dindirect block */
|
|
dindir_block = malloc(sblock.e2fs_bsize);
|
|
if (dindir_block == NULL)
|
|
errx(EXIT_FAILURE,
|
|
"%s: Can't allocate buffer for a dindirect block",
|
|
__func__);
|
|
|
|
/* allocate buffer to set data in the group descriptor blocks */
|
|
reserved_gdb = malloc(sblock.e2fs_bsize);
|
|
if (reserved_gdb == NULL)
|
|
errx(EXIT_FAILURE,
|
|
"%s: Can't allocate buffer for group descriptor blocks",
|
|
__func__);
|
|
|
|
/*
|
|
* Setup block entries in the first level dindirect blocks
|
|
*/
|
|
for (i = 0; i < sblock.e2fs_ngdb; i++) {
|
|
/* no need to handle used group descriptor blocks */
|
|
dindir_block[i] = 0;
|
|
}
|
|
for (; i < sblock.e2fs_ngdb + sblock.e2fs.e2fs_reserved_ngdb; i++) {
|
|
/*
|
|
* point reserved group descriptor block in the first
|
|
* (i.e. master) block group
|
|
*
|
|
* XXX: e2fsprogs seem to use "(i % NINDIR(&sblock))" here
|
|
* to store maximum NINDIR(&sblock) reserved gdbs.
|
|
* I'm not sure what will be done on future filesystem
|
|
* shrink in that case on their way.
|
|
*/
|
|
if (i >= NINDIR(&sblock))
|
|
errx(EXIT_FAILURE, "%s: too many reserved "
|
|
"group descriptors (%u) for resize inode",
|
|
__func__, sblock.e2fs.e2fs_reserved_ngdb);
|
|
dindir_block[i] =
|
|
h2fs32(cgbase(&sblock, 0) + NBLOCK_SUPERBLOCK + i);
|
|
|
|
/*
|
|
* Setup block entries in the second dindirect blocks
|
|
* (which are primary reserved group descriptor blocks)
|
|
* to point their backups.
|
|
*/
|
|
for (n = 0, cylno = 1; cylno < sblock.e2fs_ncg; cylno++) {
|
|
/* skip block groups without backup */
|
|
if ((sblock.e2fs.e2fs_features_rocompat &
|
|
EXT2F_ROCOMPAT_SPARSESUPER) != 0 &&
|
|
cg_has_sb(cylno) == 0)
|
|
continue;
|
|
|
|
if (n >= NINDIR(&sblock))
|
|
errx(EXIT_FAILURE, "%s: too many block groups "
|
|
"for the resize feature", __func__);
|
|
/*
|
|
* These blocks are already reserved in
|
|
* initcg() so no need to use alloc() here.
|
|
*/
|
|
reserved_gdb[n++] = h2fs32(cgbase(&sblock, cylno) +
|
|
NBLOCK_SUPERBLOCK + i);
|
|
nblock += fsbtodb(&sblock, 1);
|
|
}
|
|
for (; n < NINDIR(&sblock); n++)
|
|
reserved_gdb[n] = 0;
|
|
|
|
/* write group descriptor block as the second dindirect refs */
|
|
wtfs(fsbtodb(&sblock, fs2h32(dindir_block[i])),
|
|
sblock.e2fs_bsize, reserved_gdb);
|
|
nblock += fsbtodb(&sblock, 1);
|
|
}
|
|
for (; i < NINDIR(&sblock); i++) {
|
|
/* leave trailing entries unallocated */
|
|
dindir_block[i] = 0;
|
|
}
|
|
free(reserved_gdb);
|
|
|
|
/* finally write the first level dindirect block */
|
|
wtfs(fsbtodb(&sblock, node.e2di_blocks[NDADDR + DOUBLE]),
|
|
sblock.e2fs_bsize, dindir_block);
|
|
free(dindir_block);
|
|
|
|
node.e2di_nblock = nblock;
|
|
iput(&node, EXT2_RESIZEINO);
|
|
}
|
|
|
|
/*
|
|
* uint32_t alloc(uint32_t size, uint16_t mode)
|
|
*
|
|
* Allocate a block (from cylinder group 0)
|
|
* Reference: src/sys/ufs/ext2fs/ext2fs_alloc.c:ext2fs_alloccg()
|
|
*/
|
|
uint32_t
|
|
alloc(uint32_t size, uint16_t mode)
|
|
{
|
|
uint32_t loc, bno;
|
|
uint8_t *bbp;
|
|
uint len, map, i;
|
|
|
|
if (gd[0].ext2bgd_nbfree == 0)
|
|
return 0;
|
|
|
|
if (size > sblock.e2fs_bsize)
|
|
return 0;
|
|
|
|
bbp = malloc(sblock.e2fs_bsize);
|
|
if (bbp == NULL)
|
|
return 0;
|
|
rdfs(fsbtodb(&sblock, gd[0].ext2bgd_b_bitmap), sblock.e2fs_bsize, bbp);
|
|
|
|
/* XXX: kernel uses e2fs_fpg here */
|
|
len = sblock.e2fs.e2fs_bpg / NBBY;
|
|
|
|
#if 0 /* no need block allocation for root or lost+found dir */
|
|
for (loc = 0; loc < len; loc++) {
|
|
if (bbp[loc] == 0) {
|
|
bno = loc * NBBY;
|
|
goto gotit;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
loc = skpc(~0U, len, bbp);
|
|
if (loc == 0)
|
|
return 0;
|
|
loc = len - loc;
|
|
map = bbp[loc];
|
|
bno = loc * NBBY;
|
|
for (i = 0; i < NBBY; i++, bno++) {
|
|
if ((map & (1 << i)) == 0)
|
|
goto gotit;
|
|
}
|
|
return 0;
|
|
|
|
gotit:
|
|
if (isset(bbp, bno))
|
|
errx(EXIT_FAILURE, "%s: inconsistent bitmap\n", __func__);
|
|
|
|
setbit(bbp, bno);
|
|
wtfs(fsbtodb(&sblock, gd[0].ext2bgd_b_bitmap), sblock.e2fs_bsize, bbp);
|
|
free(bbp);
|
|
/* XXX: modified group descriptors won't be written into backups */
|
|
gd[0].ext2bgd_nbfree--;
|
|
if ((mode & EXT2_IFDIR) != 0)
|
|
gd[0].ext2bgd_ndirs++;
|
|
sblock.e2fs.e2fs_fbcount--;
|
|
|
|
return sblock.e2fs.e2fs_first_dblock + bno;
|
|
}
|
|
|
|
/*
|
|
* void iput(struct ext2fs_dinode *ip, ino_t ino)
|
|
*
|
|
* Put an inode entry into the corresponding table.
|
|
*/
|
|
static void
|
|
iput(struct ext2fs_dinode *ip, ino_t ino)
|
|
{
|
|
daddr_t d;
|
|
uint c, i;
|
|
struct ext2fs_dinode *dp;
|
|
uint8_t *bp;
|
|
|
|
bp = malloc(sblock.e2fs_bsize);
|
|
if (bp == NULL)
|
|
errx(EXIT_FAILURE, "%s: can't allocate buffer for inode\n",
|
|
__func__);
|
|
|
|
/*
|
|
* Reserved inodes are allocated and accounted in initcg()
|
|
* so skip checks of the bitmap and allocation for them.
|
|
*/
|
|
if (ino >= EXT2_FIRSTINO) {
|
|
c = ino_to_cg(&sblock, ino);
|
|
|
|
/* sanity check */
|
|
if (gd[c].ext2bgd_nifree == 0)
|
|
errx(EXIT_FAILURE,
|
|
"%s: no free inode %" PRIu64 " in block group %u\n",
|
|
__func__, (uint64_t)ino, c);
|
|
|
|
/* update inode bitmap */
|
|
rdfs(fsbtodb(&sblock, gd[0].ext2bgd_i_bitmap),
|
|
sblock.e2fs_bsize, bp);
|
|
|
|
/* more sanity */
|
|
if (isset(bp, EXT2_INO_INDEX(ino)))
|
|
errx(EXIT_FAILURE, "%s: inode %" PRIu64
|
|
" already in use\n", __func__, (uint64_t)ino);
|
|
setbit(bp, EXT2_INO_INDEX(ino));
|
|
wtfs(fsbtodb(&sblock, gd[0].ext2bgd_i_bitmap),
|
|
sblock.e2fs_bsize, bp);
|
|
gd[c].ext2bgd_nifree--;
|
|
sblock.e2fs.e2fs_ficount--;
|
|
}
|
|
|
|
if (ino >= sblock.e2fs.e2fs_ipg * sblock.e2fs_ncg)
|
|
errx(EXIT_FAILURE, "%s: inode value out of range (%" PRIu64
|
|
").\n", __func__, (uint64_t)ino);
|
|
|
|
/* update an inode entry in the table */
|
|
d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino));
|
|
rdfs(d, sblock.e2fs_bsize, bp);
|
|
|
|
dp = (struct ext2fs_dinode *)(bp +
|
|
inodesize * ino_to_fsbo(&sblock, ino));
|
|
e2fs_isave(ip, dp);
|
|
/* e2fs_i_bswap() doesn't swap e2di_blocks addrs */
|
|
if ((ip->e2di_mode & EXT2_IFMT) != EXT2_IFLNK) {
|
|
for (i = 0; i < NDADDR + NIADDR; i++)
|
|
dp->e2di_blocks[i] = h2fs32(ip->e2di_blocks[i]);
|
|
}
|
|
/* h2fs32() just for consistency */
|
|
dp->e2di_gen = h2fs32(arc4random());
|
|
|
|
wtfs(d, sblock.e2fs_bsize, bp);
|
|
free(bp);
|
|
}
|
|
|
|
/*
|
|
* Read a block from the file system
|
|
*/
|
|
void
|
|
rdfs(daddr_t bno, int size, void *bf)
|
|
{
|
|
int n;
|
|
#ifndef __minix
|
|
off_t offset;
|
|
#else
|
|
u64_t offset;
|
|
#endif
|
|
|
|
offset = bno;
|
|
#ifndef __minix
|
|
n = pread(fsi, bf, size, offset * sectorsize);
|
|
#else
|
|
n = pread64(fsi, bf, size, offset * sectorsize);
|
|
#endif
|
|
if (n != size)
|
|
err(EXIT_FAILURE, "%s: read error for sector %" PRId64,
|
|
__func__, (int64_t)bno);
|
|
}
|
|
|
|
/*
|
|
* Write a block to the file system
|
|
*/
|
|
void
|
|
wtfs(daddr_t bno, int size, void *bf)
|
|
{
|
|
int n;
|
|
#ifndef __minix
|
|
off_t offset;
|
|
#else
|
|
u64_t offset;
|
|
#endif
|
|
|
|
if (Nflag)
|
|
return;
|
|
offset = bno;
|
|
errno = 0;
|
|
#ifndef __minix
|
|
n = pwrite(fso, bf, size, offset * sectorsize);
|
|
#else
|
|
n = pwrite64(fso, bf, size, offset * sectorsize);
|
|
#endif
|
|
if (n != size)
|
|
err(EXIT_FAILURE, "%s: write error for sector %" PRId64,
|
|
__func__, (int64_t)bno);
|
|
}
|
|
|
|
int
|
|
ilog2(uint val)
|
|
{
|
|
|
|
if (val == 0 || !powerof2(val))
|
|
errx(EXIT_FAILURE, "%s: %u is not a power of 2\n",
|
|
__func__, val);
|
|
|
|
return ffs(val) - 1;
|
|
}
|
|
|
|
/*
|
|
* int skpc(int mask, size_t size, uint8_t *cp)
|
|
*
|
|
* Locate an unsigned character of value mask inside cp[].
|
|
* (from src/sys/lib/libkern/skpc.c)
|
|
*/
|
|
int
|
|
skpc(int mask, size_t size, uint8_t *cp)
|
|
{
|
|
uint8_t *end;
|
|
|
|
end = &cp[size];
|
|
while (cp < end && *cp == (uint8_t)mask)
|
|
cp++;
|
|
|
|
return end - cp;
|
|
}
|