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#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <linux/fs.h>
#include "kinit.h"
#include "do_mounts.h"
#include "fstype.h"
#include "zlib.h"
#define BUF_SZ 65536
static int
load_ramdisk_compressed(int rfd, FILE *wfd, off_t ramdisk_start)
{
uint64_t ramdisk_size;
int disk = 1;
ssize_t bytes;
int rv;
unsigned char in_buf[BUF_SZ], out_buf[BUF_SZ];
z_stream zs;
zs.zalloc = Z_NULL; /* Use malloc() */
zs.zfree = Z_NULL; /* Use free() */
zs.next_in = Z_NULL; /* No data read yet */
zs.avail_in = 0;
zs.next_out = out_buf;
zs.avail_out = BUF_SZ;
if (inflateInit(&zs) != Z_OK)
goto err1;
/* Set to the size of the medium, or "infinite" */
if (ioctl(rfd, BLKGETSIZE64, &ramdisk_size))
ramdisk_size = ~(uint64_t)0;
do {
/* Purge the output preferentially over reading new
input, so we don't end up overrunning the input by
accident and demanding a new disk which doesn't
exist... */
if (zs.avail_out == 0) {
_fwrite(out_buf, BUF_SZ, wfd);
zs.next_out = out_buf;
zs.avail_out = BUF_SZ;
putc('.', stderr);
} else if (zs.avail_in == 0) {
if (ramdisk_start >= ramdisk_size) {
fprintf(stderr, "\nPlease insert disk %d for ramdisk and press Enter...", ++disk);
while (getc(stdin) != '\n')
;
if (ioctl(rfd, BLKGETSIZE64, &ramdisk_size))
ramdisk_size = ~(uint64_t)0;
ramdisk_start = 0;
}
do {
bytes = min(ramdisk_start-ramdisk_size, (uint64_t)BUF_SZ);
bytes = pread(rfd, in_buf, bytes, ramdisk_start);
} while (bytes == -1 && errno == EINTR);
if (bytes <= 0)
goto err2;
ramdisk_start += bytes;
zs.next_in = in_buf;
zs.avail_in = bytes;
}
rv = inflate(&zs, Z_NO_FLUSH);
} while (rv == Z_OK || rv == Z_BUF_ERROR);
if (rv != Z_STREAM_END)
goto err2;
/* Write the last */
_fwrite(out_buf, BUF_SZ-zs.avail_out, wfd);
inflateEnd(&zs);
return 0;
err2:
inflateEnd(&zs);
err1:
return 1;
}
static int
load_ramdisk_raw(int rfd, FILE *wfd, off_t ramdisk_start, unsigned long long fssize)
{
uint64_t ramdisk_size;
int disk = 1;
ssize_t bytes;
unsigned char buf[BUF_SZ];
/* Set to the size of the medium, or "infinite" */
if (ioctl(rfd, BLKGETSIZE64, &ramdisk_size))
ramdisk_size = ~(uint64_t)0;
while (fssize) {
if (ramdisk_start >= ramdisk_size) {
fprintf(stderr, "\nPlease insert disk %d for ramdisk and press Enter...", ++disk);
while (getc(stdin) != '\n')
;
if (ioctl(rfd, BLKGETSIZE64, &ramdisk_size))
ramdisk_size = ~(uint64_t)0;
lseek(rfd, 0L, SEEK_SET);
ramdisk_start = 0;
}
do {
bytes = min(ramdisk_start-ramdisk_size,
min((uint64_t)fssize, (uint64_t)BUF_SZ));
bytes = pread(rfd, buf, bytes, ramdisk_start);
} while (bytes == -1 && errno == EINTR);
if (bytes <= 0)
break;
_fwrite(buf, bytes, wfd);
putc('.', stderr);
ramdisk_start += bytes;
fssize -= bytes;
}
return !!fssize;
}
int
ramdisk_load(int argc, char *argv[], dev_t root_dev)
{
const char *arg_prompt_ramdisk =
get_arg(argc, argv, "prompt_ramdisk=");
const char *arg_ramdisk_blocksize =
get_arg(argc, argv, "ramdisk_blocksize=");
const char *arg_ramdisk_start =
get_arg(argc, argv, "ramdisk_start=");
int prompt_ramdisk =
arg_prompt_ramdisk ? atoi(arg_prompt_ramdisk) : 0;
int ramdisk_blocksize =
arg_ramdisk_blocksize ? atoi(arg_ramdisk_blocksize) : 512;
off_t ramdisk_start =
arg_ramdisk_start
? strtoumax(arg_ramdisk_start, NULL, 10)*ramdisk_blocksize
: 0;
int rfd;
FILE *wfd;
const char *fstype;
unsigned long long fssize;
int is_gzip = 0;
int err;
if (prompt_ramdisk) {
fprintf(stderr, "Please insert disk for ramdisk and press Enter...");
while (getc(stdin) != '\n');
}
/* XXX: This should be better error checked. */
mknod("/dev/rddev", S_IFBLK|0400, root_dev);
mknod("/dev/ram0", S_IFBLK|0600, Root_RAM0);
rfd = open("/dev/rddev", O_RDONLY);
wfd = fopen("/dev/ram0", "w");
/* Check filesystem type */
if (identify_fs(rfd, &fstype, &fssize, ramdisk_start) ||
(fssize == 0 && !(is_gzip = !strcmp(fstype, "gzip")))) {
fprintf(stderr, "Failure loading ramdisk: unknown filesystem type\n");
return 0;
}
fprintf(stderr, "Loading ramdisk...");
if (is_gzip)
err = load_ramdisk_compressed(rfd, wfd, ramdisk_start);
else
err = load_ramdisk_raw(rfd, wfd, ramdisk_start, fssize);
close(rfd);
fclose(wfd);
putc('\n', stderr);
if (err) {
perror("Failure loading ramdisk");
return 0;
}
return 1;
}
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