Added sfdisk. Ststic-ified a bunch of stuff.

1 files changed, 332 insertions, 116 deletions

diff --git a/mkswap.c b/mkswap.c
index 8c0c4de..fceeb28 100644
--- a/mkswap.c
+++ b/mkswap.c
@@ -1,4 +1,3 @@
-#include "internal.h"
 /*
  * mkswap.c - set up a linux swap device
  *
@@ -9,51 +8,170 @@
 /*
  * 20.12.91  -	time began. Got VM working yesterday by doing this by hand.
  *
- * Usage: mkswap [-c] device [size-in-blocks]
+ * Usage: mkswap [-c] [-vN] [-f] device [size-in-blocks]
  *
- *	-c for readablility checking (use it unless you are SURE!)
+ *	-c   for readability checking. (Use it unless you are SURE!)
+ *	-vN  for swap areas version N. (Only N=0,1 known today.)
+ *      -f   for forcing swap creation even if it would smash partition table.
  *
- * The device may be a block device or a image of one, but this isn't
+ * The device may be a block device or an image of one, but this isn't
  * enforced (but it's not much fun on a character device :-).
  *
  * Patches from jaggy@purplet.demon.co.uk (Mike Jagdis) to make the
  * size-in-blocks parameter optional added Wed Feb  8 10:33:43 1995.
+ *
+ * Version 1 swap area code (for kernel 2.1.117), aeb, 981010.
+ *
+ * Sparc fixes, jj@ultra.linux.cz (Jakub Jelinek), 981201 - mangled by aeb.
+ * V1_MAX_PAGES fixes, jj, 990325.
+ *
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
+ * - added Native Language Support
+ *
+ *  from util-linux -- adapted for busybox by
+ *  Erik Andersen <andersee@debian.org>. I ripped out Native Language
+ *  Support, made some stuff smaller, and fitted for life in busybox.
+ *
  */
 
+#include "internal.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <string.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#include <sys/ioctl.h>		/* for _IO */
+#include <sys/utsname.h>
 #include <sys/stat.h>
-#include <sys/ioctl.h>
+#include <asm/page.h>		/* for PAGE_SIZE and PAGE_SHIFT */
+				/* we also get PAGE_SIZE via getpagesize() */
 
-#include <asm/page.h>
-#include <linux/fs.h>
 
-#ifndef __linux__
-# define volatile
-#endif
+static const char mkswap_usage[] = "mkswap [-c] [-v0|-v1] device [block-count]\n"
+"Prepare a disk partition to be used as a swap partition.\n\n"
+"\t-c\tCheck for read-ability.\n"
+"\t-v0\tMake version 0 swap [max 128 Megs].\n"
+"\t-v1\tMake version 1 swap [big!] (default for kernels > 2.1.117).\n"
+"\tblock-count\tNumber of block to use (default is entire partition).\n";
 
-#define TEST_BUFFER_PAGES 8
 
-const char	mkswap_usage[] = "mkswap [-c] partition [block-count]\n"
-"\n"
-"\tPrepare a disk partition to be used as a swap partition.\n"
-"\tThe default block count is the size of the entire partition.\n"
-"\n"
-"\t-c:\tCheck for read-ability.\n"
-"\tblock-count\tUse only this many blocks.\n";
+#ifndef _IO
+/* pre-1.3.45 */
+#define BLKGETSIZE 0x1260
+#else
+/* same on i386, m68k, arm; different on alpha, mips, sparc, ppc */
+#define BLKGETSIZE _IO(0x12,96)
+#endif
 
-static const char * program_name = "mkswap";
-static const char * device_name = NULL;
+static char * program_name = "mkswap";
+static char * device_name = NULL;
 static int DEV = -1;
 static long PAGES = 0;
-static int do_check = 0;
+static int check = 0;
 static int badpages = 0;
+static int version = -1;
+
+#define MAKE_VERSION(p,q,r)	(65536*(p) + 256*(q) + (r))
+
+static int
+linux_version_code(void) {
+	struct utsname my_utsname;
+	int p, q, r;
+
+	if (uname(&my_utsname) == 0) {
+		p = atoi(strtok(my_utsname.release, "."));
+		q = atoi(strtok(NULL, "."));
+		r = atoi(strtok(NULL, "."));
+		return MAKE_VERSION(p,q,r);
+	}
+	return 0;
+}
+
+/*
+ * The definition of the union swap_header uses the constant PAGE_SIZE.
+ * Unfortunately, on some architectures this depends on the hardware model,
+ * and can only be found at run time -- we use getpagesize().
+ */
+
+static int pagesize;
+static int *signature_page;
+
+struct swap_header_v1 {
+        char         bootbits[1024];    /* Space for disklabel etc. */
+	unsigned int version;
+	unsigned int last_page;
+	unsigned int nr_badpages;
+	unsigned int padding[125];
+	unsigned int badpages[1];
+} *p;
+
+static void
+init_signature_page() {
+	pagesize = getpagesize();
+
+#ifdef PAGE_SIZE
+	if (pagesize != PAGE_SIZE)
+		fprintf(stderr, "Assuming pages of size %d\n", pagesize);
+#endif
+	signature_page = (int *) malloc(pagesize);
+	memset(signature_page,0,pagesize);
+	p = (struct swap_header_v1 *) signature_page;
+}
 
+static void
+write_signature(char *sig) {
+	char *sp = (char *) signature_page;
 
-static long bit_test_and_set (unsigned int *addr, unsigned int nr)
+	strncpy(sp+pagesize-10, sig, 10);
+}
+
+#define V0_MAX_PAGES	(8 * (pagesize - 10))
+/* Before 2.2.0pre9 */
+#define V1_OLD_MAX_PAGES	((0x7fffffff / pagesize) - 1)
+/* Since 2.2.0pre9:
+   error if nr of pages >= SWP_OFFSET(SWP_ENTRY(0,~0UL))
+   with variations on
+	#define SWP_ENTRY(type,offset) (((type) << 1) | ((offset) << 8))
+	#define SWP_OFFSET(entry) ((entry) >> 8)
+   on the various architectures. Below the result - yuk.
+
+   Machine	pagesize	SWP_ENTRY	SWP_OFFSET	bound+1	oldbound+2
+   i386		2^12		o<<8		e>>8		1<<24	1<<19
+   mips		2^12		o<<15		e>>15		1<<17	1<<19
+   alpha	2^13		o<<40		e>>40		1<<24	1<<18
+   m68k		2^12		o<<12		e>>12		1<<20	1<<19
+   sparc	2^{12,13}	(o&0x3ffff)<<9	(e>>9)&0x3ffff	1<<18	1<<{19,18}
+   sparc64	2^13		o<<13		e>>13		1<<51	1<<18
+   ppc		2^12		o<<8		e>>8		1<<24	1<<19
+   armo		2^{13,14,15}	o<<8		e>>8		1<<24	1<<{18,17,16}
+   armv		2^12		o<<9		e>>9		1<<23	1<<19
+
+   assuming that longs have 64 bits on alpha and sparc64 and 32 bits elsewhere.
+
+   The bad part is that we need to know this since the kernel will
+   refuse a swap space if it is too large.
+*/
+/* patch from jj - why does this differ from the above? */
+#if defined(__alpha__)
+#define V1_MAX_PAGES           ((1 << 24) - 1)
+#elif defined(__mips__)
+#define V1_MAX_PAGES           ((1 << 17) - 1)
+#elif defined(__sparc_v9__)
+#define V1_MAX_PAGES           ((3 << 29) - 1)
+#elif defined(__sparc__)
+#define V1_MAX_PAGES           (pagesize == 8192 ? ((3 << 29) - 1) : ((1 << 18) - 1))
+#else
+#define V1_MAX_PAGES           V1_OLD_MAX_PAGES
+#endif
+/* man page now says:
+The maximum useful size of a swap area now depends on the architecture.
+It is roughly 2GB on i386, PPC, m68k, ARM, 1GB on sparc, 512MB on mips,
+128GB on alpha and 3TB on sparc64.
+*/
+
+#define MAX_BADPAGES	((pagesize-1024-128*sizeof(int)-10)/sizeof(int))
+
+static void bit_set (unsigned int *addr, unsigned int nr)
 {
 	unsigned int r, m;
 
@@ -61,7 +179,6 @@ static long bit_test_and_set (unsigned int *addr, unsigned int nr)
 	r = *addr;
 	m = 1 << (nr & (8 * sizeof(int) - 1));
 	*addr = r | m;
-	return (r & m) != 0;
 }
 
 static int bit_test_and_clear (unsigned int *addr, unsigned int nr)
@@ -75,47 +192,59 @@ static int bit_test_and_clear (unsigned int *addr, unsigned int nr)
 	return (r & m) != 0;
 }
 
-/*
- * Volatile to let gcc know that this doesn't return. When trying
- * to compile this under minix, volatile gives a warning, as
- * exit() isn't defined as volatile under minix.
- */
-volatile void fatal_error(const char * fmt_string)
-{
-	fprintf(stderr,fmt_string,program_name,device_name);
-	exit(FALSE);
+
+void
+die(const char *str) {
+	fprintf(stderr, "%s: %s\n", program_name, str);
+	exit( FALSE);
 }
 
-#define die(str) fatal_error("%s: " str "\n")
+void
+page_ok(int page) {
+	if (version==0)
+		bit_set(signature_page, page);
+}
 
-static void check_blocks(int * signature_page)
-{
+void
+page_bad(int page) {
+	if (version == 0)
+		bit_test_and_clear(signature_page, page);
+	else {
+		if (badpages == MAX_BADPAGES)
+			die("too many bad pages");
+		p->badpages[badpages] = page;
+	}
+	badpages++;
+}
+
+void
+check_blocks(void) {
 	unsigned int current_page;
 	int do_seek = 1;
-	char buffer[PAGE_SIZE];
+	char *buffer;
 
+	buffer = malloc(pagesize);
+	if (!buffer)
+		die("Out of memory");
 	current_page = 0;
 	while (current_page < PAGES) {
-		if (!do_check) {
-			bit_test_and_set(signature_page,current_page++);
+		if (!check) {
+			page_ok(current_page++);
 			continue;
-		} else {
-			printf("\r%d", current_page);
 		}
-		if (do_seek && lseek(DEV,current_page*PAGE_SIZE,SEEK_SET) !=
-		current_page*PAGE_SIZE)
+		if (do_seek && lseek(DEV,current_page*pagesize,SEEK_SET) !=
+		    current_page*pagesize)
 			die("seek failed in check_blocks");
-		if ( (do_seek = (PAGE_SIZE != read(DEV, buffer, PAGE_SIZE))) ) {
-			bit_test_and_clear(signature_page,current_page++);
-			badpages++;
+		if ((do_seek = (pagesize != read(DEV, buffer, pagesize)))) {
+			page_bad(current_page++);
 			continue;
 		}
-		bit_test_and_set(signature_page,current_page++);
+		page_ok(current_page++);
 	}
-	if (do_check)
-		printf("\n");
-	if (badpages)
-		printf("%d bad page%s\n",badpages,(badpages>1)?"s":"");
+	if (badpages == 1)
+		printf("one bad page\n");
+	else if (badpages > 1)
+		printf("%d bad pages\n", badpages);
 }
 
 static long valid_offset (int fd, int offset)
@@ -129,12 +258,13 @@ static long valid_offset (int fd, int offset)
 	return 1;
 }
 
-static int count_blocks (int fd)
+static int
+find_size (int fd)
 {
-	int high, low;
+	unsigned int high, low;
 
 	low = 0;
-	for (high = 1; valid_offset (fd, high); high *= 2)
+	for (high = 1; high > 0 && valid_offset (fd, high); high *= 2)
 		low = high;
 	while (low < high - 1)
 	{
@@ -145,108 +275,194 @@ static int count_blocks (int fd)
 		else
 			high = mid;
 	}
-	valid_offset (fd, 0);
 	return (low + 1);
 }
 
-static int get_size(const char  *file)
+/* return size in pages, to avoid integer overflow */
+static long
+get_size(const char  *file)
 {
 	int	fd;
-	int	size;
+	long	size;
 
-	fd = open(file, O_RDWR);
+	fd = open(file, O_RDONLY);
 	if (fd < 0) {
 		perror(file);
 		exit(1);
 	}
 	if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
-		close(fd);
-		return (size * 512);
+		int sectors_per_page = pagesize/512;
+		size /= sectors_per_page;
+	} else {
+		size = find_size(fd) / pagesize;
 	}
-		
-	size = count_blocks(fd);
 	close(fd);
 	return size;
 }
 
-int
-mkswap(const char *device_name, int pages, int check)
-  {
+int mkswap_main(int argc, char ** argv)
+{
+	char * tmp;
 	struct stat statbuf;
+	int sz;
+	int maxpages;
 	int goodpages;
-	int signature_page[PAGE_SIZE/sizeof(int)];
+	int offset;
+	int force = 0;
 
-	PAGES = pages;
-	do_check = check;
+	if (argc && *argv)
+		program_name = *argv;
 
-	memset(signature_page,0,PAGE_SIZE);
+	init_signature_page();	/* get pagesize */
 
-	if (device_name && !PAGES) {
-		PAGES = get_size(device_name) / PAGE_SIZE;
+	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;
+				if (*tmp)
+					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);
+			}
+		}
+	}
+	if (!device_name) {
+		fprintf(stderr,
+			"%s: error: Nowhere to set up swap on?\n",
+			program_name);
+		usage( mkswap_usage);
 	}
-	if (!device_name || PAGES<10) {
+	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);
+	}
+
+	if (version == -1) {
+		if (PAGES <= V0_MAX_PAGES)
+			version = 0;
+		else if (linux_version_code() < MAKE_VERSION(2,1,117))
+			version = 0;
+		else if (pagesize < 2048)
+			version = 0;
+		else
+			version = 1;
+	}
+	if (version != 0 && version != 1) {
+		fprintf(stderr, "%s: error: unknown version %d\n",
+			program_name, version);
+		usage( mkswap_usage);
+	}
+	if (PAGES < 10) {
 		fprintf(stderr,
 			"%s: error: swap area needs to be at least %ldkB\n",
-			program_name, 10 * PAGE_SIZE / 1024);
-		/*		usage(mkswap_usage); */
-		exit(1);
+			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))
+		maxpages = V1_MAX_PAGES;
+	else {
+		maxpages = V1_OLD_MAX_PAGES;
+		if (maxpages > V1_MAX_PAGES)
+			maxpages = V1_MAX_PAGES;
 	}
-	if (PAGES > 8 * (PAGE_SIZE - 10)) {
-	        PAGES = 8 * (PAGE_SIZE - 10);
+#endif
+	if (PAGES > maxpages) {
+		PAGES = maxpages;
 		fprintf(stderr, "%s: warning: truncating swap area to %ldkB\n",
-			program_name, PAGES * PAGE_SIZE / 1024);
+			program_name, PAGES * pagesize / 1024);
 	}
+
 	DEV = open(device_name,O_RDWR);
 	if (DEV < 0 || fstat(DEV, &statbuf) < 0) {
 		perror(device_name);
-		exit(1);
+		exit( FALSE);
 	}
 	if (!S_ISBLK(statbuf.st_mode))
-		do_check=0;
+		check=0;
 	else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
 		die("Will not try to make swapdevice on '%s'");
-	check_blocks(signature_page);
-	if (!bit_test_and_clear(signature_page,0))
+
+#ifdef __sparc__
+	if (!force && version == 0) {
+		/* Don't overwrite partition table unless forced */
+		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);
+			for (sum = 0; q >= (unsigned short *) buffer;)
+				sum ^= *q--;
+			if (!sum) {
+				fprintf(stderr, "\
+%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);
+			}
+		}
+	}
+#endif
+
+	if (version == 0 || check)
+		check_blocks();
+	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->nr_badpages = badpages;
+	}
+
 	goodpages = PAGES - badpages - 1;
 	if (goodpages <= 0)
 		die("Unable to set up swap-space: unreadable");
-	printf("Setting up swapspace, size = %ld bytes\n",goodpages*PAGE_SIZE);
-	strncpy((char*)signature_page+PAGE_SIZE-10,"SWAP-SPACE",10);
-	if (lseek(DEV, 0, SEEK_SET))
+	printf("Setting up swapspace version %d, size = %ld bytes\n",
+		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 (PAGE_SIZE != write(DEV, signature_page, PAGE_SIZE))
+	if (write(DEV,(char*)signature_page+offset, pagesize-offset)
+	    != pagesize-offset)
 		die("unable to write signature page");
 
-	close(DEV);
-	return (TRUE);
-}
-
-int mkswap_main(int argc, char ** argv)
-{
-	char * tmp;
-	long int pages=0;
-	int check=0;
-
-	if (argc && *argv)
-		program_name = *argv;
-	while (argc > 1) {
-		argv++;
-		argc--;
-		if (argv[0][0] != '-')
-			if (device_name) {
-				pages = strtol(argv[0],&tmp,0)>>(PAGE_SHIFT-10);
-				if (*tmp) {
-				    usage (mkswap_usage);
-				}
-			} else
-				device_name = argv[0];
-		else while (*++argv[0])
-			switch (argv[0][0]) {
-				case 'c': check=1; break;
-				default: usage (mkswap_usage);
-					exit( TRUE);
-			}
-	}
-	exit( mkswap(device_name, pages, check));
+	/*
+	 * A subsequent swapon() will fail if the signature
+	 * is not actually on disk. (This is a kernel bug.)
+	 */
+	if (fsync(DEV))
+		 die("fsync failed");
+	exit ( TRUE);
 }