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Some formatting updates (ran the code through indent)

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-Erik
This commit is contained in:
Erik Andersen
2000-02-08 19:58:47 +00:00
parent c0bf817bbc
commit e49d5ecbbe
163 changed files with 27109 additions and 26607 deletions
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197
mkswap.c
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@@ -1,3 +1,4 @@
/* vi: set sw=4 ts=4: */
/*
* mkswap.c - set up a linux swap device
*
@@ -40,20 +41,21 @@
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/ioctl.h> /* for _IO */
#include <sys/ioctl.h> /* for _IO */
#include <sys/utsname.h>
#include <sys/stat.h>
#include <asm/page.h> /* for PAGE_SIZE and PAGE_SHIFT */
#include <asm/page.h> /* for PAGE_SIZE and PAGE_SHIFT */
/* we also get PAGE_SIZE via getpagesize() */
static const char mkswap_usage[] = "mkswap [-c] [-v0|-v1] device [block-count]\n\n"
"Prepare a disk partition to be used as a swap partition.\n\n"
"Options:\n"
"\t-c\t\tCheck for read-ability.\n"
"\t-v0\t\tMake version 0 swap [max 128 Megs].\n"
"\t-v1\t\tMake version 1 swap [big!] (default for kernels > 2.1.117).\n"
"\tblock-count\tNumber of block to use (default is entire partition).\n";
static const char mkswap_usage[] =
"mkswap [-c] [-v0|-v1] device [block-count]\n\n"
"Prepare a disk partition to be used as a swap partition.\n\n"
"Options:\n" "\t-c\t\tCheck for read-ability.\n"
"\t-v0\t\tMake version 0 swap [max 128 Megs].\n"
"\t-v1\t\tMake version 1 swap [big!] (default for kernels > 2.1.117).\n"
"\tblock-count\tNumber of block to use (default is entire partition).\n";
#ifndef _IO
@@ -64,8 +66,8 @@ static const char mkswap_usage[] = "mkswap [-c] [-v0|-v1] device [block-count]\n
#define BLKGETSIZE _IO(0x12,96)
#endif
static char * program_name = "mkswap";
static char * device_name = NULL;
static char *program_name = "mkswap";
static char *device_name = NULL;
static int DEV = -1;
static long PAGES = 0;
static int check = 0;
@@ -74,8 +76,8 @@ static int version = -1;
#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
static int
linux_version_code(void) {
static int linux_version_code(void)
{
struct utsname my_utsname;
int p, q, r;
@@ -83,7 +85,7 @@ linux_version_code(void) {
p = atoi(strtok(my_utsname.release, "."));
q = atoi(strtok(NULL, "."));
r = atoi(strtok(NULL, "."));
return MAKE_VERSION(p,q,r);
return MAKE_VERSION(p, q, r);
}
return 0;
}
@@ -98,7 +100,7 @@ static int pagesize;
static int *signature_page;
struct swap_header_v1 {
char bootbits[1024]; /* Space for disklabel etc. */
char bootbits[1024]; /* Space for disklabel etc. */
unsigned int version;
unsigned int last_page;
unsigned int nr_badpages;
@@ -106,8 +108,8 @@ struct swap_header_v1 {
unsigned int badpages[1];
} *p;
static void
init_signature_page() {
static void init_signature_page()
{
pagesize = getpagesize();
#ifdef PAGE_SIZE
@@ -115,15 +117,15 @@ init_signature_page() {
fprintf(stderr, "Assuming pages of size %d\n", pagesize);
#endif
signature_page = (int *) malloc(pagesize);
memset(signature_page,0,pagesize);
memset(signature_page, 0, pagesize);
p = (struct swap_header_v1 *) signature_page;
}
static void
write_signature(char *sig) {
static void write_signature(char *sig)
{
char *sp = (char *) signature_page;
strncpy(sp+pagesize-10, sig, 10);
strncpy(sp + pagesize - 10, sig, 10);
}
#define V0_MAX_PAGES (8 * (pagesize - 10))
@@ -172,42 +174,46 @@ It is roughly 2GB on i386, PPC, m68k, ARM, 1GB on sparc, 512MB on mips,
#define MAX_BADPAGES ((pagesize-1024-128*sizeof(int)-10)/sizeof(int))
static void bit_set (unsigned int *addr, unsigned int nr)
static void bit_set(unsigned int *addr, unsigned int nr)
{
unsigned int r, m;
addr += nr / (8 * sizeof(int));
r = *addr;
m = 1 << (nr & (8 * sizeof(int) - 1));
*addr = r | m;
}
static int bit_test_and_clear (unsigned int *addr, unsigned int nr)
static int bit_test_and_clear(unsigned int *addr, unsigned int nr)
{
unsigned int r, m;
addr += nr / (8 * sizeof(int));
r = *addr;
m = 1 << (nr & (8 * sizeof(int) - 1));
*addr = r & ~m;
return (r & m) != 0;
}
void
die(const char *str) {
void die(const char *str)
{
fprintf(stderr, "%s: %s\n", program_name, str);
exit( FALSE);
exit(FALSE);
}
void
page_ok(int page) {
if (version==0)
void page_ok(int page)
{
if (version == 0)
bit_set(signature_page, page);
}
void
page_bad(int page) {
void page_bad(int page)
{
if (version == 0)
bit_test_and_clear(signature_page, page);
else {
@@ -218,8 +224,8 @@ page_bad(int page) {
badpages++;
}
void
check_blocks(void) {
void check_blocks(void)
{
unsigned int current_page;
int do_seek = 1;
char *buffer;
@@ -233,8 +239,8 @@ check_blocks(void) {
page_ok(current_page++);
continue;
}
if (do_seek && lseek(DEV,current_page*pagesize,SEEK_SET) !=
current_page*pagesize)
if (do_seek && lseek(DEV, current_page * pagesize, SEEK_SET) !=
current_page * pagesize)
die("seek failed in check_blocks");
if ((do_seek = (pagesize != read(DEV, buffer, pagesize)))) {
page_bad(current_page++);
@@ -248,30 +254,28 @@ check_blocks(void) {
printf("%d bad pages\n", badpages);
}
static long valid_offset (int fd, int offset)
static long valid_offset(int fd, int offset)
{
char ch;
if (lseek (fd, offset, 0) < 0)
if (lseek(fd, offset, 0) < 0)
return 0;
if (read (fd, &ch, 1) < 1)
if (read(fd, &ch, 1) < 1)
return 0;
return 1;
}
static int
find_size (int fd)
static int find_size(int fd)
{
unsigned int high, low;
low = 0;
for (high = 1; high > 0 && valid_offset (fd, high); high *= 2)
for (high = 1; high > 0 && valid_offset(fd, high); high *= 2)
low = high;
while (low < high - 1)
{
while (low < high - 1) {
const int mid = (low + high) / 2;
if (valid_offset (fd, mid))
if (valid_offset(fd, mid))
low = mid;
else
high = mid;
@@ -280,11 +284,10 @@ find_size (int fd)
}
/* return size in pages, to avoid integer overflow */
static long
get_size(const char *file)
static long get_size(const char *file)
{
int fd;
long size;
int fd;
long size;
fd = open(file, O_RDONLY);
if (fd < 0) {
@@ -292,7 +295,8 @@ get_size(const char *file)
exit(1);
}
if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
int sectors_per_page = pagesize/512;
int sectors_per_page = pagesize / 512;
size /= sectors_per_page;
} else {
size = find_size(fd) / pagesize;
@@ -301,9 +305,9 @@ get_size(const char *file)
return size;
}
int mkswap_main(int argc, char ** argv)
int mkswap_main(int argc, char **argv)
{
char * tmp;
char *tmp;
struct stat statbuf;
int sz;
int maxpages;
@@ -314,56 +318,56 @@ int mkswap_main(int argc, char ** argv)
if (argc && *argv)
program_name = *argv;
init_signature_page(); /* get pagesize */
init_signature_page(); /* get pagesize */
while (argc-- > 1) {
argv++;
if (argv[0][0] != '-') {
if (device_name) {
int blocks_per_page = pagesize/1024;
PAGES = strtol(argv[0],&tmp,0)/blocks_per_page;
int blocks_per_page = pagesize / 1024;
PAGES = strtol(argv[0], &tmp, 0) / blocks_per_page;
if (*tmp)
usage( mkswap_usage);
usage(mkswap_usage);
} else
device_name = argv[0];
} else {
switch (argv[0][1]) {
case 'c':
check=1;
break;
case 'f':
force=1;
break;
case 'v':
version=atoi(argv[0]+2);
break;
default:
usage( mkswap_usage);
case 'c':
check = 1;
break;
case 'f':
force = 1;
break;
case 'v':
version = atoi(argv[0] + 2);
break;
default:
usage(mkswap_usage);
}
}
}
if (!device_name) {
fprintf(stderr,
"%s: error: Nowhere to set up swap on?\n",
program_name);
usage( mkswap_usage);
"%s: error: Nowhere to set up swap on?\n", program_name);
usage(mkswap_usage);
}
sz = get_size(device_name);
if (!PAGES) {
PAGES = sz;
} else if (PAGES > sz && !force) {
fprintf(stderr,
"%s: error: "
"size %ld is larger than device size %d\n",
program_name,
PAGES*(pagesize/1024), sz*(pagesize/1024));
exit( FALSE);
"%s: error: "
"size %ld is larger than device size %d\n",
program_name,
PAGES * (pagesize / 1024), sz * (pagesize / 1024));
exit(FALSE);
}
if (version == -1) {
if (PAGES <= V0_MAX_PAGES)
version = 0;
else if (linux_version_code() < MAKE_VERSION(2,1,117))
else if (linux_version_code() < MAKE_VERSION(2, 1, 117))
version = 0;
else if (pagesize < 2048)
version = 0;
@@ -372,21 +376,21 @@ int mkswap_main(int argc, char ** argv)
}
if (version != 0 && version != 1) {
fprintf(stderr, "%s: error: unknown version %d\n",
program_name, version);
usage( mkswap_usage);
program_name, version);
usage(mkswap_usage);
}
if (PAGES < 10) {
fprintf(stderr,
"%s: error: swap area needs to be at least %ldkB\n",
program_name, (long)(10 * pagesize / 1024));
usage( mkswap_usage);
"%s: error: swap area needs to be at least %ldkB\n",
program_name, (long) (10 * pagesize / 1024));
usage(mkswap_usage);
}
#if 0
maxpages = ((version == 0) ? V0_MAX_PAGES : V1_MAX_PAGES);
#else
if (!version)
maxpages = V0_MAX_PAGES;
else if (linux_version_code() >= MAKE_VERSION(2,2,1))
else if (linux_version_code() >= MAKE_VERSION(2, 2, 1))
maxpages = V1_MAX_PAGES;
else {
maxpages = V1_OLD_MAX_PAGES;
@@ -397,29 +401,29 @@ int mkswap_main(int argc, char ** argv)
if (PAGES > maxpages) {
PAGES = maxpages;
fprintf(stderr, "%s: warning: truncating swap area to %ldkB\n",
program_name, PAGES * pagesize / 1024);
program_name, PAGES * pagesize / 1024);
}
DEV = open(device_name,O_RDWR);
DEV = open(device_name, O_RDWR);
if (DEV < 0 || fstat(DEV, &statbuf) < 0) {
perror(device_name);
exit( FALSE);
exit(FALSE);
}
if (!S_ISBLK(statbuf.st_mode))
check=0;
check = 0;
else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
die("Will not try to make swapdevice on '%s'");
#ifdef __sparc__
if (!force && version == 0) {
/* Don't overwrite partition table unless forced */
unsigned char *buffer = (unsigned char *)signature_page;
unsigned char *buffer = (unsigned char *) signature_page;
unsigned short *q, sum;
if (read(DEV, buffer, 512) != 512)
die("fatal: first page unreadable");
if (buffer[508] == 0xDA && buffer[509] == 0xBE) {
q = (unsigned short *)(buffer + 510);
q = (unsigned short *) (buffer + 510);
for (sum = 0; q >= (unsigned short *) buffer;)
sum ^= *q--;
if (!sum) {
@@ -427,9 +431,8 @@ int mkswap_main(int argc, char ** argv)
%s: Device '%s' contains a valid Sun disklabel.\n\
This probably means creating v0 swap would destroy your partition table\n\
No swap created. If you really want to create swap v0 on that device, use\n\
the -f option to force it.\n",
program_name, device_name);
exit( FALSE);
the -f option to force it.\n", program_name, device_name);
exit(FALSE);
}
}
}
@@ -437,11 +440,11 @@ the -f option to force it.\n",
if (version == 0 || check)
check_blocks();
if (version == 0 && !bit_test_and_clear(signature_page,0))
if (version == 0 && !bit_test_and_clear(signature_page, 0))
die("fatal: first page unreadable");
if (version == 1) {
p->version = version;
p->last_page = PAGES-1;
p->last_page = PAGES - 1;
p->nr_badpages = badpages;
}
@@ -449,14 +452,14 @@ the -f option to force it.\n",
if (goodpages <= 0)
die("Unable to set up swap-space: unreadable");
printf("Setting up swapspace version %d, size = %ld bytes\n",
version, (long)(goodpages*pagesize));
version, (long) (goodpages * pagesize));
write_signature((version == 0) ? "SWAP-SPACE" : "SWAPSPACE2");
offset = ((version == 0) ? 0 : 1024);
if (lseek(DEV, offset, SEEK_SET) != offset)
die("unable to rewind swap-device");
if (write(DEV,(char*)signature_page+offset, pagesize-offset)
!= pagesize-offset)
if (write(DEV, (char *) signature_page + offset, pagesize - offset)
!= pagesize - offset)
die("unable to write signature page");
/*
@@ -464,6 +467,6 @@ the -f option to force it.\n",
* is not actually on disk. (This is a kernel bug.)
*/
if (fsync(DEV))
die("fsync failed");
exit ( TRUE);
die("fsync failed");
exit(TRUE);
}