579 lines
12 KiB
C
579 lines
12 KiB
C
/*
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* file_media.c -
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*
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* Written by Eryk Vershen
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*/
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/*
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* Copyright 1997,1998 by Apple Computer, Inc.
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both the copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// for printf()
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#include <stdio.h>
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// for malloc() & free()
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#include <stdlib.h>
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// for lseek(), read(), write(), close()
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#include <unistd.h>
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// for open()
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#include <fcntl.h>
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// for LONG_MAX
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#include <limits.h>
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// for errno
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#include <errno.h>
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#ifdef __linux__
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#include <sys/ioctl.h>
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#include <linux/fs.h>
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#include <linux/hdreg.h>
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#include <sys/stat.h>
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#else
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#ifdef __unix__
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#endif
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#endif
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#include "file_media.h"
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#include "errors.h"
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/*
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* Defines
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*/
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#ifdef __linux__
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#define LOFF_MAX 9223372036854775807LL
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extern __loff_t llseek __P ((int __fd, __loff_t __offset, int __whence));
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#elif defined(__NetBSD__) || defined(__APPLE__)
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#define loff_t off_t
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#define llseek lseek
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#define LOFF_MAX LLONG_MAX
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#else
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#define loff_t long
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#define llseek lseek
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#define LOFF_MAX LONG_MAX
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#endif
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/*
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* Types
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*/
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typedef struct file_media *FILE_MEDIA;
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struct file_media {
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struct media m;
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int fd;
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int regular_file;
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};
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struct file_media_globals {
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long exists;
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long kind;
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};
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typedef struct file_media_iterator *FILE_MEDIA_ITERATOR;
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struct file_media_iterator {
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struct media_iterator m;
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long style;
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long index;
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};
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/*
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* Global Constants
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*/
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int potential_block_sizes[] = {
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1, 512, 1024, 2048,
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0
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};
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enum {
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kSCSI_Disks = 0,
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kATA_Devices = 1,
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kSCSI_CDs = 2,
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kMaxStyle = 2
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};
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/*
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* Global Variables
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*/
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static long file_inited = 0;
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static struct file_media_globals file_info;
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/*
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* Forward declarations
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*/
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int compute_block_size(int fd);
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void file_init(void);
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FILE_MEDIA new_file_media(void);
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long read_file_media(MEDIA m, long long offset, unsigned long count, void *address);
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long write_file_media(MEDIA m, long long offset, unsigned long count, void *address);
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long close_file_media(MEDIA m);
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long os_reload_file_media(MEDIA m);
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FILE_MEDIA_ITERATOR new_file_iterator(void);
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void reset_file_iterator(MEDIA_ITERATOR m);
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char *step_file_iterator(MEDIA_ITERATOR m);
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void delete_file_iterator(MEDIA_ITERATOR m);
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/*
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* Routines
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*/
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void
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file_init(void)
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{
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if (file_inited != 0) {
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return;
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}
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file_inited = 1;
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file_info.kind = allocate_media_kind();
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}
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FILE_MEDIA
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new_file_media(void)
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{
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return (FILE_MEDIA) new_media(sizeof(struct file_media));
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}
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int
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compute_block_size(int fd)
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{
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int size;
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int max_size;
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loff_t x;
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long t;
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int i;
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char *buffer;
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max_size = 0;
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for (i = 0; ; i++) {
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size = potential_block_sizes[i];
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if (size == 0) {
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break;
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}
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if (max_size < size) {
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max_size = size;
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}
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}
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buffer = malloc(max_size);
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if (buffer != 0) {
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for (i = 0; ; i++) {
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size = potential_block_sizes[i];
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if (size == 0) {
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break;
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}
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if ((x = llseek(fd, (loff_t)0, 0)) < 0) {
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error(errno, "Can't seek on file");
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break;
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}
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if ((t = read(fd, buffer, size)) == size) {
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free(buffer);
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return size;
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}
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}
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}
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return 0;
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}
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MEDIA
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open_file_as_media(char *file, int oflag)
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{
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FILE_MEDIA a;
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int fd;
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loff_t off;
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#if defined(__linux__) || defined(__unix__)
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struct stat info;
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#endif
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if (file_inited == 0) {
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file_init();
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}
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a = 0;
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fd = open(file, oflag);
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if (fd >= 0) {
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a = new_file_media();
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if (a != 0) {
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a->m.kind = file_info.kind;
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a->m.grain = compute_block_size(fd);
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off = llseek(fd, (loff_t)0, 2); /* seek to end of media */
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#if !defined(__linux__) && !defined(__unix__)
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if (off <= 0) {
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off = 1; /* XXX not right? */
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}
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#endif
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//printf("file size = %Ld\n", off);
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a->m.size_in_bytes = (long long) off;
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a->m.do_read = read_file_media;
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a->m.do_write = write_file_media;
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a->m.do_close = close_file_media;
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a->m.do_os_reload = os_reload_file_media;
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a->fd = fd;
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a->regular_file = 0;
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#if defined(__linux__) || defined(__unix__)
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if (fstat(fd, &info) < 0) {
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error(errno, "can't stat file '%s'", file);
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} else {
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a->regular_file = S_ISREG(info.st_mode);
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}
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#endif
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} else {
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close(fd);
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}
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}
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return (MEDIA) a;
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}
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long
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read_file_media(MEDIA m, long long offset, unsigned long count, void *address)
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{
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FILE_MEDIA a;
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long rtn_value;
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loff_t off;
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int t;
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a = (FILE_MEDIA) m;
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rtn_value = 0;
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if (a == 0) {
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/* no media */
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fprintf(stderr,"no media\n");
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} else if (a->m.kind != file_info.kind) {
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/* wrong kind - XXX need to error here - this is an internal problem */
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fprintf(stderr,"wrong kind\n");
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} else if (count <= 0 || count % a->m.grain != 0) {
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/* can't handle size */
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fprintf(stderr,"bad size\n");
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} else if (offset < 0 || offset % a->m.grain != 0) {
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/* can't handle offset */
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fprintf(stderr,"bad offset\n");
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} else if (offset + (long long) count > a->m.size_in_bytes && a->m.size_in_bytes != (long long) 0) {
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/* check for offset (and offset+count) too large */
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fprintf(stderr,"offset+count too large\n");
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} else if (offset + count > (long long) LOFF_MAX) {
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/* check for offset (and offset+count) too large */
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fprintf(stderr,"offset+count too large 2\n");
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} else {
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/* do the read */
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off = offset;
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if ((off = llseek(a->fd, off, 0)) >= 0) {
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if ((t = read(a->fd, address, count)) == (ssize_t)count) {
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rtn_value = 1;
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} else {
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fprintf(stderr,"read failed\n");
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}
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} else {
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fprintf(stderr,"lseek failed\n");
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}
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}
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return rtn_value;
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}
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long
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write_file_media(MEDIA m, long long offset, unsigned long count, void *address)
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{
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FILE_MEDIA a;
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long rtn_value;
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loff_t off;
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int t;
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a = (FILE_MEDIA) m;
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rtn_value = 0;
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if (a == 0) {
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/* no media */
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} else if (a->m.kind != file_info.kind) {
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/* wrong kind - XXX need to error here - this is an internal problem */
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} else if (count <= 0 || count % a->m.grain != 0) {
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/* can't handle size */
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} else if (offset < 0 || offset % a->m.grain != 0) {
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/* can't handle offset */
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} else if (offset + count > (long long) LOFF_MAX) {
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/* check for offset (and offset+count) too large */
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} else {
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/* do the write */
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off = offset;
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if ((off = llseek(a->fd, off, 0)) >= 0) {
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if ((t = write(a->fd, address, count)) == (ssize_t)count) {
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if (off + (long long) count > a->m.size_in_bytes) {
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a->m.size_in_bytes = off + count;
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}
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rtn_value = 1;
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}
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}
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}
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return rtn_value;
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}
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long
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close_file_media(MEDIA m)
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{
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FILE_MEDIA a;
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a = (FILE_MEDIA) m;
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if (a == 0) {
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return 0;
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} else if (a->m.kind != file_info.kind) {
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/* XXX need to error here - this is an internal problem */
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return 0;
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}
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close(a->fd);
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return 1;
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}
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long
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os_reload_file_media(MEDIA m)
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{
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FILE_MEDIA a;
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long rtn_value;
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#if defined(__linux__)
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int i;
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int saved_errno;
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#endif
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a = (FILE_MEDIA) m;
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rtn_value = 0;
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if (a == 0) {
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/* no media */
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} else if (a->m.kind != file_info.kind) {
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/* wrong kind - XXX need to error here - this is an internal problem */
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} else if (a->regular_file) {
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/* okay - nothing to do */
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rtn_value = 1;
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} else {
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#ifdef __linux__
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sync();
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sleep(2);
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if ((i = ioctl(a->fd, BLKRRPART)) != 0) {
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saved_errno = errno;
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} else {
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// some kernel versions (1.2.x) seem to have trouble
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// rereading the partition table, but if asked to do it
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// twice, the second time works. - biro@yggdrasil.com */
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sync();
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sleep(2);
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if ((i = ioctl(a->fd, BLKRRPART)) != 0) {
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saved_errno = errno;
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}
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}
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// printf("Syncing disks.\n");
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sync();
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sleep(4); /* for sync() */
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if (i < 0) {
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error(saved_errno, "Re-read of partition table failed");
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printf("Reboot your system to ensure the "
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"partition table is updated.\n");
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}
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#endif
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rtn_value = 1;
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}
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return rtn_value;
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}
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#if !defined(__linux__) && !defined(__unix__)
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#pragma mark -
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#endif
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FILE_MEDIA_ITERATOR
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new_file_iterator(void)
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{
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return (FILE_MEDIA_ITERATOR) new_media_iterator(sizeof(struct file_media_iterator));
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}
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MEDIA_ITERATOR
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create_file_iterator(void)
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{
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FILE_MEDIA_ITERATOR a;
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if (file_inited == 0) {
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file_init();
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}
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a = new_file_iterator();
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if (a != 0) {
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a->m.kind = file_info.kind;
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a->m.state = kInit;
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a->m.do_reset = reset_file_iterator;
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a->m.do_step = step_file_iterator;
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a->m.do_delete = delete_file_iterator;
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a->style = 0;
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a->index = 0;
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}
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return (MEDIA_ITERATOR) a;
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}
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void
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reset_file_iterator(MEDIA_ITERATOR m)
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{
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FILE_MEDIA_ITERATOR a;
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a = (FILE_MEDIA_ITERATOR) m;
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if (a == 0) {
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/* no media */
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} else if (a->m.kind != file_info.kind) {
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/* wrong kind - XXX need to error here - this is an internal problem */
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} else if (a->m.state != kInit) {
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a->m.state = kReset;
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}
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}
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|
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char *
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step_file_iterator(MEDIA_ITERATOR m)
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{
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FILE_MEDIA_ITERATOR a;
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char *result;
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struct stat info;
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int fd;
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int bump;
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int value;
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a = (FILE_MEDIA_ITERATOR) m;
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if (a == 0) {
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/* no media */
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} else if (a->m.kind != file_info.kind) {
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/* wrong kind - XXX need to error here - this is an internal problem */
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} else {
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switch (a->m.state) {
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case kInit:
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a->m.state = kReset;
|
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/* fall through to reset */
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case kReset:
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a->style = 0 /* first style */;
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a->index = 0 /* first index */;
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a->m.state = kIterating;
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/* fall through to iterate */
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case kIterating:
|
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while (1) {
|
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if (a->style > kMaxStyle) {
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break;
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}
|
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#ifndef notdef
|
|
/* if old version of mklinux then skip CD drive */
|
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if (a->style == kSCSI_Disks && a->index == 3) {
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a->index += 1;
|
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}
|
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#endif
|
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/* generate result */
|
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result = (char *) malloc(20);
|
|
if (result != NULL) {
|
|
/*
|
|
* for DR3 we should actually iterate through:
|
|
*
|
|
* /dev/sd[a...] # first missing is end of list
|
|
* /dev/hd[a...] # may be holes in sequence
|
|
* /dev/scd[0...] # first missing is end of list
|
|
*
|
|
* and stop in each group when either a stat of
|
|
* the name fails or if an open fails for
|
|
* particular reasons.
|
|
*/
|
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bump = 0;
|
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value = (int) a->index;
|
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switch (a->style) {
|
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case kSCSI_Disks:
|
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if (value < 26) {
|
|
snprintf(result, 20, "/dev/sd%c", 'a'+value);
|
|
} else if (value < 676) {
|
|
snprintf(result, 20, "/dev/sd%c%c",
|
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'a' + value / 26,
|
|
'a' + value % 26);
|
|
} else {
|
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bump = -1;
|
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}
|
|
break;
|
|
case kATA_Devices:
|
|
if (value < 26) {
|
|
snprintf(result, 20, "/dev/hd%c", 'a'+value);
|
|
} else {
|
|
bump = -1;
|
|
}
|
|
break;
|
|
case kSCSI_CDs:
|
|
if (value < 10) {
|
|
snprintf(result, 20, "/dev/scd%c", '0'+value);
|
|
} else {
|
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bump = -1;
|
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}
|
|
break;
|
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}
|
|
if (bump != 0) {
|
|
// already set don't even check
|
|
} else if (stat(result, &info) < 0) {
|
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bump = 1;
|
|
} else if ((fd = open(result, O_RDONLY)) >= 0) {
|
|
close(fd);
|
|
#if defined(__linux__) || defined(__unix__)
|
|
} else if (errno == ENXIO || errno == ENODEV) {
|
|
if (a->style == kATA_Devices) {
|
|
bump = -1;
|
|
} else {
|
|
bump = 1;
|
|
}
|
|
#endif
|
|
}
|
|
if (bump) {
|
|
if (bump > 0) {
|
|
a->style += 1; /* next style */
|
|
a->index = 0; /* first index again */
|
|
} else {
|
|
a->index += 1; /* next index */
|
|
}
|
|
free(result);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
a->index += 1; /* next index */
|
|
return result;
|
|
}
|
|
a->m.state = kEnd;
|
|
/* fall through to end */
|
|
case kEnd:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return 0 /* no entry */;
|
|
}
|
|
|
|
|
|
void
|
|
delete_file_iterator(MEDIA_ITERATOR m)
|
|
{
|
|
return;
|
|
}
|