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![Pedro F. Giffuni](/assets/img/avatar_default.png)
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
204 lines
4.9 KiB
C
204 lines
4.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2002 Juli Mallett. All rights reserved.
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*
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* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
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* FreeBSD project. Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistribution 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
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/stat.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <errno.h>
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#include <fcntl.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 <libufs.h>
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ssize_t
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bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size)
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{
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void *p2;
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ssize_t cnt;
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ERROR(disk, NULL);
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p2 = data;
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/*
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* XXX: various disk controllers require alignment of our buffer
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* XXX: which is stricter than struct alignment.
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* XXX: Bounce the buffer if not 64 byte aligned.
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* XXX: this can be removed if/when the kernel is fixed
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*/
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if (((intptr_t)data) & 0x3f) {
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p2 = malloc(size);
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if (p2 == NULL) {
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ERROR(disk, "allocate bounce buffer");
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goto fail;
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}
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}
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cnt = pread(disk->d_fd, p2, size, (off_t)(blockno * disk->d_bsize));
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if (cnt == -1) {
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ERROR(disk, "read error from block device");
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goto fail;
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}
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if (cnt == 0) {
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ERROR(disk, "end of file from block device");
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goto fail;
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}
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if ((size_t)cnt != size) {
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ERROR(disk, "short read or read error from block device");
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goto fail;
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}
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if (p2 != data) {
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memcpy(data, p2, size);
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free(p2);
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}
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return (cnt);
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fail: memset(data, 0, size);
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if (p2 != data) {
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free(p2);
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}
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return (-1);
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}
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ssize_t
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bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size)
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{
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ssize_t cnt;
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int rv;
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void *p2 = NULL;
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ERROR(disk, NULL);
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rv = ufs_disk_write(disk);
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if (rv == -1) {
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ERROR(disk, "failed to open disk for writing");
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return (-1);
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}
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/*
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* XXX: various disk controllers require alignment of our buffer
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* XXX: which is stricter than struct alignment.
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* XXX: Bounce the buffer if not 64 byte aligned.
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* XXX: this can be removed if/when the kernel is fixed
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*/
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if (((intptr_t)data) & 0x3f) {
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p2 = malloc(size);
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if (p2 == NULL) {
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ERROR(disk, "allocate bounce buffer");
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return (-1);
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}
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memcpy(p2, data, size);
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data = p2;
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}
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cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize));
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if (p2 != NULL)
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free(p2);
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if (cnt == -1) {
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ERROR(disk, "write error to block device");
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return (-1);
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}
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if ((size_t)cnt != size) {
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ERROR(disk, "short write to block device");
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return (-1);
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}
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return (cnt);
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}
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#ifdef __FreeBSD_kernel__
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static int
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berase_helper(struct uufsd *disk, ufs2_daddr_t blockno, ufs2_daddr_t size)
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{
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off_t ioarg[2];
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ioarg[0] = blockno * disk->d_bsize;
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ioarg[1] = size;
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return (ioctl(disk->d_fd, DIOCGDELETE, ioarg));
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}
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#else
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static int
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berase_helper(struct uufsd *disk, ufs2_daddr_t blockno, ufs2_daddr_t size)
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{
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char *zero_chunk;
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off_t offset, zero_chunk_size, pwrite_size;
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int rv;
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offset = blockno * disk->d_bsize;
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zero_chunk_size = 65536 * disk->d_bsize;
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zero_chunk = calloc(1, zero_chunk_size);
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if (zero_chunk == NULL) {
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ERROR(disk, "failed to allocate memory");
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return (-1);
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}
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while (size > 0) {
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pwrite_size = size;
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if (pwrite_size > zero_chunk_size)
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pwrite_size = zero_chunk_size;
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rv = pwrite(disk->d_fd, zero_chunk, pwrite_size, offset);
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if (rv == -1) {
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ERROR(disk, "failed writing to disk");
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break;
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}
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size -= rv;
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offset += rv;
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rv = 0;
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}
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free(zero_chunk);
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return (rv);
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}
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#endif
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int
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berase(struct uufsd *disk, ufs2_daddr_t blockno, ufs2_daddr_t size)
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{
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int rv;
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ERROR(disk, NULL);
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rv = ufs_disk_write(disk);
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if (rv == -1) {
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ERROR(disk, "failed to open disk for writing");
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return(rv);
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}
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return (berase_helper(disk, blockno, size));
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}
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