557 lines
13 KiB
C
557 lines
13 KiB
C
/* $NetBSD: ustarfs.c,v 1.12 1999/09/20 11:58:15 ross Exp $ */
|
|
|
|
/* [Notice revision 2.2]
|
|
* Copyright (c) 1997, 1998 Avalon Computer Systems, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Ross Harvey
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright and
|
|
* author notice, this list of conditions, and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of Avalon Computer Systems, Inc. nor the names of
|
|
* its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* 4. This copyright will be assigned to The NetBSD Foundation on
|
|
* 1/1/2000 unless these terms (including possibly the assignment
|
|
* date) are updated in writing by Avalon prior to the latest specified
|
|
* assignment date.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY AVALON COMPUTER SYSTEMS, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AVALON OR THE CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
|
|
/*
|
|
******************************* USTAR FS *******************************
|
|
*/
|
|
|
|
/*
|
|
* Implement an ROFS with an 8K boot area followed by ustar-format data.
|
|
* The point: minimal FS overhead, and it's easy (well, `possible') to
|
|
* split files over multiple volumes.
|
|
*
|
|
* XXX - TODO LIST
|
|
* --- - ---- ----
|
|
* XXX - tag volume numbers and verify that the correct volume is
|
|
* inserted after volume swaps.
|
|
*
|
|
* XXX - stop hardwiring FS metadata for floppies...embed it in a file,
|
|
* file name, or something. (Remember __SYMDEF? :-)
|
|
*
|
|
* XXX Does not currently implement:
|
|
* XXX
|
|
* XXX LIBSA_NO_FS_CLOSE
|
|
* XXX LIBSA_NO_FS_SEEK
|
|
* XXX LIBSA_NO_FS_WRITE
|
|
* XXX LIBSA_NO_FS_SYMLINK (does this even make sense?)
|
|
* XXX LIBSA_FS_SINGLECOMPONENT
|
|
*/
|
|
|
|
#ifdef _STANDALONE
|
|
#include <lib/libkern/libkern.h>
|
|
#else
|
|
#include <string.h>
|
|
#endif
|
|
#include "stand.h"
|
|
#include "ustarfs.h"
|
|
|
|
#define BBSIZE 8192
|
|
#define USTAR_NAME_BLOCK 512
|
|
|
|
/*
|
|
* Virtual offset: relative to start of ustar archive
|
|
* Logical offset: volume-relative
|
|
* Physical offset: the usual meaning
|
|
*/
|
|
|
|
/* virtual offset to volume number */
|
|
|
|
#define vda2vn(_v,_volsize) ((_v) / (_volsize))
|
|
|
|
/* conversions between the three different levels of disk addresses */
|
|
|
|
#define vda2lda(_v,_volsize) ((_v) % (_volsize))
|
|
#define lda2vda(_v,_volsize,_volnumber) ((_v) + (_volsize) * (_volnumber))
|
|
|
|
#define lda2pda(_lda) ((_lda) + ustarfs_mode_offset)
|
|
#define pda2lda(_pda) ((_pda) - ustarfs_mode_offset)
|
|
/*
|
|
* Change this to off_t if you want to support big volumes. If we only use
|
|
* ustarfs on floppies it can stay int for libsa code density.
|
|
*
|
|
* It needs to be signed.
|
|
*/
|
|
typedef int ustoffs;
|
|
|
|
typedef struct ustar_struct {
|
|
char ust_name[100],
|
|
ust_mode[8],
|
|
ust_uid[8],
|
|
ust_gid[8],
|
|
ust_size[12],
|
|
ust_misc[12 + 8 + 1 + 100],
|
|
ust_magic[6];
|
|
/* there is more, but we don't care */
|
|
} ustar_t;
|
|
|
|
/*
|
|
* We buffer one even cylindar of data...it's actually only really one
|
|
* cyl on a 1.44M floppy, but on other devices it's fast enough with any
|
|
* kind of block buffering, so we optimize for the slowest device.
|
|
*/
|
|
|
|
typedef struct ust_active_struct {
|
|
ustar_t uas_active;
|
|
char uas_1cyl[18 * 2 * 512];
|
|
ustoffs uas_volsize; /* XXX this is hardwired now */
|
|
ustoffs uas_windowbase; /* relative to volume 0 */
|
|
ustoffs uas_filestart; /* relative to volume 0 */
|
|
ustoffs uas_fseek; /* relative to file */
|
|
ustoffs uas_filesize; /* relative to volume 0 */
|
|
int uas_init_window; /* data present in window */
|
|
int uas_init_fs; /* ust FS actually found */
|
|
int uas_volzerosig; /* ID volume 0 by signature */
|
|
int uas_sigdone; /* did sig already */
|
|
int uas_offset; /* amount of cylinder below lba 0 */
|
|
} ust_active_t;
|
|
|
|
static const char formatid[] = "USTARFS",
|
|
metaname[] = "USTAR.volsize.";
|
|
|
|
static int ustarfs_mode_offset = BBSIZE;
|
|
|
|
static int checksig __P((ust_active_t *));
|
|
static int convert __P((const char *, int, int));
|
|
static int get_volume __P((struct open_file *, int));
|
|
static void setwindow(ust_active_t *, ustoffs, ustoffs);
|
|
static int real_fs_cylinder_read __P((struct open_file *, ustoffs, int));
|
|
static int ustarfs_cylinder_read __P((struct open_file *, ustoffs, int));
|
|
static void ustarfs_sscanf __P((const char *, const char *, int *));
|
|
static int read512block __P((struct open_file *, ustoffs, char block[512]));
|
|
static int init_volzero_sig __P((struct open_file *));
|
|
|
|
static int
|
|
convert(f, base, fw)
|
|
const char *f;
|
|
int base, fw;
|
|
{
|
|
int i, c, result = 0;
|
|
|
|
while(fw > 0 && *f == ' ') {
|
|
--fw;
|
|
++f;
|
|
}
|
|
for(i = 0; i < fw; ++i) {
|
|
c = f[i];
|
|
if ('0' <= c && c < '0' + base) {
|
|
c -= '0';
|
|
result = result * base + c;
|
|
} else break;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
ustarfs_sscanf(s,f,xi)
|
|
const char *s,*f;
|
|
int *xi;
|
|
{
|
|
*xi = convert(s, 8, convert(f + 1, 10, 99));
|
|
}
|
|
|
|
static int
|
|
ustarfs_cylinder_read(f, seek2, forcelabel)
|
|
struct open_file *f;
|
|
ustoffs seek2;
|
|
{
|
|
int i, e;
|
|
|
|
for (i = 0; i < 3; ++i) {
|
|
e = real_fs_cylinder_read(f, seek2, forcelabel);
|
|
if (e == 0)
|
|
return 0;
|
|
}
|
|
return e;
|
|
}
|
|
|
|
static int
|
|
real_fs_cylinder_read(f, seek2, forcelabel)
|
|
struct open_file *f;
|
|
ustoffs seek2;
|
|
{
|
|
int i;
|
|
int e = 0; /* XXX work around gcc warning */
|
|
ustoffs lda;
|
|
char *xferbase;
|
|
ust_active_t *ustf;
|
|
size_t xferrqst, xfercount;
|
|
|
|
ustf = f->f_fsdata;
|
|
xferrqst = sizeof ustf->uas_1cyl;
|
|
xferbase = ustf->uas_1cyl;
|
|
lda = pda2lda(seek2);
|
|
if (lda < 0) {
|
|
lda = -lda;
|
|
ustf->uas_offset = lda;
|
|
/*
|
|
* don't read the label unless we have to. (Preserve
|
|
* sequential block access so tape boot works.)
|
|
*/
|
|
if (!forcelabel) {
|
|
memset(xferbase, 0, lda);
|
|
xferrqst -= lda;
|
|
xferbase += lda;
|
|
seek2 += lda;
|
|
}
|
|
} else
|
|
ustf->uas_offset = 0;
|
|
while(xferrqst > 0) {
|
|
#if !defined(LIBSA_NO_TWIDDLE)
|
|
twiddle();
|
|
#endif
|
|
for (i = 0; i < 3; ++i) {
|
|
e = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
|
|
seek2 / 512, xferrqst, xferbase, &xfercount);
|
|
if (e == 0)
|
|
break;
|
|
printf("@");
|
|
}
|
|
if (e)
|
|
break;
|
|
if (xfercount != xferrqst)
|
|
printf("Warning, unexpected short transfer %d/%d\n",
|
|
(int)xfercount, (int)xferrqst);
|
|
xferrqst -= xfercount;
|
|
xferbase += xfercount;
|
|
seek2 += xfercount;
|
|
}
|
|
return e;
|
|
}
|
|
|
|
static int
|
|
checksig(ustf)
|
|
ust_active_t *ustf;
|
|
{
|
|
int i, rcs;
|
|
|
|
for(i = rcs = 0; i < sizeof ustf->uas_1cyl; ++i)
|
|
rcs += ustf->uas_1cyl[i];
|
|
return rcs;
|
|
}
|
|
|
|
static int
|
|
get_volume(f, vn)
|
|
struct open_file *f;
|
|
int vn;
|
|
{
|
|
int e, needvolume, havevolume;
|
|
ust_active_t *ustf;
|
|
|
|
ustf = f->f_fsdata;
|
|
havevolume = vda2vn(ustf->uas_windowbase, ustf->uas_volsize);
|
|
needvolume = vn;
|
|
while(havevolume != needvolume) {
|
|
printf("\nPlease ");
|
|
if (havevolume >= 0)
|
|
printf("remove disk %d, ", havevolume + 1);
|
|
printf("insert disk %d, and type return...",
|
|
needvolume + 1);
|
|
getchar();
|
|
printf("\n");
|
|
e = ustarfs_cylinder_read(f, 0, needvolume != 0);
|
|
if (e)
|
|
return e;
|
|
if(strncmp(formatid, ustf->uas_1cyl, strlen(formatid))) {
|
|
/* no magic, might be OK if we want volume 0 */
|
|
if (ustf->uas_volzerosig == checksig(ustf)) {
|
|
havevolume = 0;
|
|
continue;
|
|
}
|
|
printf("Disk is not from the volume set?!\n");
|
|
havevolume = -2;
|
|
continue;
|
|
}
|
|
ustarfs_sscanf(ustf->uas_1cyl + strlen(formatid), "%9o",
|
|
&havevolume);
|
|
--havevolume;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
setwindow(ust_active_t *ustf, ustoffs pda, ustoffs vda)
|
|
{
|
|
ustf->uas_windowbase = lda2vda(pda2lda(pda), ustf->uas_volsize,
|
|
vda2vn(vda, ustf->uas_volsize))
|
|
+ ustf->uas_offset;
|
|
ustf->uas_init_window = 1;
|
|
}
|
|
|
|
static int
|
|
read512block(f, vda, block)
|
|
struct open_file *f;
|
|
ustoffs vda;
|
|
char block[512];
|
|
{
|
|
ustoffs pda;
|
|
ssize_t e;
|
|
int dienow;
|
|
ust_active_t *ustf;
|
|
|
|
dienow = 0;
|
|
ustf = f->f_fsdata;
|
|
|
|
/*
|
|
* if (vda in window)
|
|
* copy out and return data
|
|
* if (vda is on some other disk)
|
|
* do disk swap
|
|
* get physical disk address
|
|
* round down to cylinder boundary
|
|
* read cylindar
|
|
* set window (in vda space) and try again
|
|
* [ there is an implicit assumption that windowbase always identifies
|
|
* the current volume, even if initwindow == 0. This way, a
|
|
* windowbase of 0 causes the initial volume to be disk 0 ]
|
|
*/
|
|
tryagain:
|
|
if(ustf->uas_init_window
|
|
&& ustf->uas_windowbase <= vda && vda <
|
|
ustf->uas_windowbase + sizeof ustf->uas_1cyl - ustf->uas_offset) {
|
|
memcpy(block, ustf->uas_1cyl
|
|
+ (vda - ustf->uas_windowbase)
|
|
+ ustf->uas_offset, 512);
|
|
return 0;
|
|
}
|
|
if (dienow++)
|
|
panic("ustarfs read512block");
|
|
ustf->uas_init_window = 0;
|
|
e = get_volume(f, vda2vn(vda, ustf->uas_volsize));
|
|
if (e)
|
|
return e;
|
|
pda = lda2pda(vda2lda(vda, ustf->uas_volsize));
|
|
pda-= pda % sizeof ustf->uas_1cyl;
|
|
e = ustarfs_cylinder_read(f, pda, 0);
|
|
if (e)
|
|
return e;
|
|
setwindow(ustf, pda, vda);
|
|
goto tryagain;
|
|
}
|
|
|
|
static int
|
|
init_volzero_sig(f)
|
|
struct open_file *f;
|
|
{
|
|
int e;
|
|
ust_active_t *ustf;
|
|
|
|
ustf = f->f_fsdata;
|
|
if (!ustf->uas_sigdone) {
|
|
e = ustarfs_cylinder_read(f, 0, 0);
|
|
if (e)
|
|
return e;
|
|
ustf->uas_volzerosig = checksig(ustf);
|
|
setwindow(ustf, 0, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ustarfs_open(path, f)
|
|
char *path;
|
|
struct open_file *f;
|
|
|
|
{
|
|
ust_active_t *ustf;
|
|
ustoffs offset;
|
|
char block[512];
|
|
int filesize;
|
|
int e, e2;
|
|
int newvolblocks;
|
|
|
|
if (*path == '/')
|
|
++path;
|
|
f->f_fsdata = ustf = alloc(sizeof *ustf);
|
|
memset(ustf, 0, sizeof *ustf);
|
|
offset = 0;
|
|
/* default to 2880 sector floppy */
|
|
ustf->uas_volsize = 80 * 2 * 18 * 512 - lda2pda(0);
|
|
ustf->uas_fseek = 0;
|
|
e = init_volzero_sig(f);
|
|
if (e)
|
|
return e;
|
|
e2 = EINVAL;
|
|
for(;;) {
|
|
ustf->uas_filestart = offset;
|
|
e = read512block(f, offset, block);
|
|
if (e)
|
|
break;
|
|
memcpy(&ustf->uas_active, block, sizeof ustf->uas_active);
|
|
if(strncmp(ustf->uas_active.ust_magic, "ustar", 5)) {
|
|
e = e2;
|
|
break;
|
|
}
|
|
e2 = ENOENT; /* it must be an actual ustarfs */
|
|
ustf->uas_init_fs = 1;
|
|
/* if volume metadata is found, use it */
|
|
if(strncmp(ustf->uas_active.ust_name, metaname,
|
|
strlen(metaname)) == 0) {
|
|
ustarfs_sscanf(ustf->uas_active.ust_name
|
|
+ strlen(metaname), "%99o", &newvolblocks);
|
|
ustf->uas_volsize = newvolblocks * 512
|
|
- lda2pda(0);
|
|
}
|
|
ustarfs_sscanf(ustf->uas_active.ust_size,"%12o",&filesize);
|
|
if(strncmp(ustf->uas_active.ust_name, path,
|
|
sizeof ustf->uas_active.ust_name) == 0) {
|
|
ustf->uas_filesize = filesize;
|
|
break;
|
|
}
|
|
offset += USTAR_NAME_BLOCK + filesize;
|
|
filesize %= 512;
|
|
if (filesize)
|
|
offset += 512 - filesize;
|
|
}
|
|
if (e) {
|
|
free(ustf, sizeof *ustf);
|
|
f->f_fsdata = 0;
|
|
}
|
|
return e;
|
|
}
|
|
|
|
#ifndef LIBSA_NO_FS_WRITE
|
|
int
|
|
ustarfs_write(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid;
|
|
{
|
|
return (EROFS);
|
|
}
|
|
#endif /* !LIBSA_NO_FS_WRITE */
|
|
|
|
#ifndef LIBSA_NO_FS_SEEK
|
|
off_t
|
|
ustarfs_seek(f, offs, whence)
|
|
struct open_file *f;
|
|
off_t offs;
|
|
int whence;
|
|
{
|
|
ust_active_t *ustf;
|
|
|
|
ustf = f->f_fsdata;
|
|
switch (whence) {
|
|
case SEEK_SET:
|
|
ustf->uas_fseek = offs;
|
|
break;
|
|
case SEEK_CUR:
|
|
ustf->uas_fseek += offs;
|
|
break;
|
|
case SEEK_END:
|
|
ustf->uas_fseek = ustf->uas_filesize - offs;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
return ustf->uas_fseek;
|
|
}
|
|
#endif /* !LIBSA_NO_FS_CLOSE */
|
|
|
|
int
|
|
ustarfs_read(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid;
|
|
{
|
|
ust_active_t *ustf;
|
|
int e;
|
|
char *space512;
|
|
int blkoffs,
|
|
readoffs,
|
|
bufferoffset;
|
|
size_t seg;
|
|
int infile,
|
|
inbuffer;
|
|
|
|
e = 0;
|
|
space512 = alloc(512);
|
|
ustf = f->f_fsdata;
|
|
while(size != 0) {
|
|
if (ustf->uas_fseek >= ustf->uas_filesize)
|
|
break;
|
|
bufferoffset = ustf->uas_fseek % 512;
|
|
blkoffs = ustf->uas_fseek - bufferoffset;
|
|
readoffs = ustf->uas_filestart + 512 + blkoffs;
|
|
e = read512block(f, readoffs, space512);
|
|
if (e)
|
|
break;
|
|
seg = size;
|
|
inbuffer = 512 - bufferoffset;
|
|
if (inbuffer < seg)
|
|
seg = inbuffer;
|
|
infile = ustf->uas_filesize - ustf->uas_fseek;
|
|
if (infile < seg)
|
|
seg = infile;
|
|
memcpy(start, space512 + bufferoffset, seg);
|
|
ustf->uas_fseek += seg;
|
|
start = (caddr_t)start + seg;
|
|
size -= seg;
|
|
}
|
|
if (resid)
|
|
*resid = size;
|
|
free(space512, 512);
|
|
return e;
|
|
}
|
|
|
|
int
|
|
ustarfs_stat(f, sb)
|
|
struct open_file *f;
|
|
struct stat *sb;
|
|
{
|
|
int mode, uid, gid;
|
|
ust_active_t *ustf;
|
|
|
|
if (f == NULL)
|
|
return EINVAL;
|
|
ustf = f->f_fsdata;
|
|
memset(sb, 0, sizeof *sb);
|
|
ustarfs_sscanf(ustf->uas_active.ust_mode, "%8o", &mode);
|
|
ustarfs_sscanf(ustf->uas_active.ust_uid, "%8o", &uid);
|
|
ustarfs_sscanf(ustf->uas_active.ust_gid, "%8o", &gid);
|
|
sb->st_mode = mode;
|
|
sb->st_uid = uid;
|
|
sb->st_gid = gid;
|
|
sb->st_size = ustf->uas_filesize;
|
|
return 0;
|
|
}
|
|
|
|
#ifndef LIBSA_NO_FS_CLOSE
|
|
int
|
|
ustarfs_close(f)
|
|
struct open_file *f;
|
|
{
|
|
if (f == NULL || f->f_fsdata == NULL)
|
|
return EINVAL;
|
|
free(f->f_fsdata, sizeof(ust_active_t));
|
|
f->f_fsdata = 0;
|
|
return 0;
|
|
}
|
|
#endif /* !LIBSA_NO_FS_CLOSE */
|