/*
* 20.12.91 - time began. Got VM working yesterday by doing this by hand.
*
- * Usuage: 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.
+ * sparc64 fixes, jj, 000219.
+ *
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
-#include <sys/ioctl.h>
+#include <limits.h>
+#include <mntent.h>
+#include <sys/utsname.h>
#include <sys/stat.h>
-#include <asm/page.h>
+#include <errno.h>
+#include <err.h>
+#include <getopt.h>
+#ifdef HAVE_LIBSELINUX
+#include <selinux/selinux.h>
+#include <selinux/context.h>
+#endif
-#define BLKGETSIZE 0x1260
+#include "linux_version.h"
+#include "swapheader.h"
+#include "strutils.h"
+#include "nls.h"
+#include "blkdev.h"
+#include "pathnames.h"
+#include "wholedisk.h"
+#include "writeall.h"
+#include "xalloc.h"
-#ifndef __linux__
-# define volatile
+#ifdef HAVE_LIBUUID
+# include <uuid.h>
#endif
-#define TEST_BUFFER_PAGES 8
+#ifdef HAVE_LIBBLKID_INTERNAL
+# include <blkid.h>
+#endif
-static char * program_name = "mkswap";
-static char * device_name = NULL;
+static char *device_name = NULL;
static int DEV = -1;
-static long PAGES = 0;
+static unsigned long long PAGES = 0;
+static unsigned long badpages = 0;
static int check = 0;
-static int badpages = 0;
-static int signature_page[PAGE_SIZE/sizeof(int)];
+#define SELINUX_SWAPFILE_TYPE "swapfile_t"
-static void bit_set (unsigned int *addr, unsigned int nr)
+#ifdef __sparc__
+# ifdef __arch64__
+# define is_sparc64() 1
+# define is_be64() 1
+# else /* sparc32 */
+static int
+is_sparc64(void)
{
- unsigned int r, m;
+ struct utsname un;
+ static int sparc64 = -1;
+
+ if (sparc64 != -1)
+ return sparc64;
+ sparc64 = 0;
+
+ if (uname(&un) < 0)
+ return 0;
+ if (! strcmp(un.machine, "sparc64")) {
+ sparc64 = 1;
+ return 1;
+ }
+ if (strcmp(un.machine, "sparc"))
+ return 0; /* Should not happen */
+
+#ifdef HAVE_PERSONALITY
+ {
+ extern int personality(unsigned long);
+ int oldpers;
+#define PERS_LINUX 0x00000000
+#define PERS_LINUX_32BIT 0x00800000
+#define PERS_LINUX32 0x00000008
+
+ oldpers = personality(PERS_LINUX_32BIT);
+ if (oldpers != -1) {
+ if (personality(PERS_LINUX) != -1) {
+ uname(&un);
+ if (! strcmp(un.machine, "sparc64")) {
+ sparc64 = 1;
+ oldpers = PERS_LINUX32;
+ }
+ }
+ personality(oldpers);
+ }
+ }
+#endif
- addr += nr / (8 * sizeof(int));
- r = *addr;
- m = 1 << (nr & (8 * sizeof(int) - 1));
- *addr = r | m;
+ return sparc64;
}
+# define is_be64() is_sparc64()
+# endif /* sparc32 */
+#else /* !sparc */
+# define is_be64() 0
+#endif
+
+/*
+ * The definition of the union swap_header uses the kernel constant PAGE_SIZE.
+ * Unfortunately, on some architectures this depends on the hardware model, and
+ * can only be found at run time -- we use getpagesize(), so that we do not
+ * need separate binaries e.g. for sun4, sun4c/d/m and sun4u.
+ *
+ * Even more unfortunately, getpagesize() does not always return the right
+ * information. For example, libc4, libc5 and glibc 2.0 do not use the system
+ * call but invent a value themselves (EXEC_PAGESIZE or NBPG * CLSIZE or NBPC),
+ * and thus it may happen that e.g. on a sparc kernel PAGE_SIZE=4096 and
+ * getpagesize() returns 8192.
+ *
+ * What to do? Let us allow the user to specify the pagesize explicitly.
+ *
+ */
+static long user_pagesize;
+static int pagesize;
+static unsigned long *signature_page = NULL;
+
+static void
+init_signature_page(void)
+{
+
+ int kernel_pagesize = pagesize = getpagesize();
+
+ if (user_pagesize) {
+ if ((user_pagesize & (user_pagesize - 1)) ||
+ user_pagesize < (long) sizeof(struct swap_header_v1_2) + 10)
+ errx(EXIT_FAILURE,
+ _("Bad user-specified page size %lu"),
+ user_pagesize);
+ pagesize = user_pagesize;
+ }
-static int bit_test_and_clear (unsigned int *addr, unsigned int nr)
+ if (user_pagesize && user_pagesize != kernel_pagesize)
+ warnx(_("Using user-specified page size %d, "
+ "instead of the system value %d"),
+ pagesize, kernel_pagesize);
+
+ signature_page = (unsigned long *) xcalloc(1, pagesize);
+}
+
+static void
+write_signature(char *sig)
{
- unsigned int r, m;
+ char *sp = (char *) signature_page;
- addr += nr / (8 * sizeof(int));
- r = *addr;
- m = 1 << (nr & (8 * sizeof(int) - 1));
- *addr = r & ~m;
- return (r & m) != 0;
+ strncpy(sp + pagesize - 10, sig, 10);
}
+static void
+write_uuid_and_label(unsigned char *uuid, char *volume_name)
+{
+ struct swap_header_v1_2 *h;
+
+ /* Sanity check */
+ if (sizeof(struct swap_header_v1) !=
+ sizeof(struct swap_header_v1_2)) {
+ warnx(_("Bad swap header size, no label written."));
+ return;
+ }
+
+ h = (struct swap_header_v1_2 *) signature_page;
+ if (uuid)
+ memcpy(h->uuid, uuid, sizeof(h->uuid));
+ if (volume_name) {
+ xstrncpy(h->volume_name, volume_name, sizeof(h->volume_name));
+ if (strlen(volume_name) > strlen(h->volume_name))
+ warnx(_("Label was truncated."));
+ }
+ if (uuid || volume_name) {
+ if (volume_name)
+ printf("LABEL=%s, ", h->volume_name);
+ else
+ printf(_("no label, "));
+#ifdef HAVE_LIBUUID
+ if (uuid) {
+ char uuid_string[37];
+ uuid_unparse(uuid, uuid_string);
+ printf("UUID=%s\n", uuid_string);
+ } else
+#endif
+ printf(_("no uuid\n"));
+ }
+}
+
+/*
+ * Find out what the maximum amount of swap space is that the kernel will
+ * handle. This wouldn't matter if the kernel just used as much of the
+ * swap space as it can handle, but until 2.3.4 it would return an error
+ * to swapon() if the swapspace was too large.
+ */
+/* Before 2.2.0pre9 */
+#define V1_OLD_MAX_PAGES ((0x7fffffff / pagesize) - 1)
+/* Since 2.2.0pre9, before 2.3.4:
+ 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? */
+/* 32bit kernels have a second limitation of 2GB, sparc64 is limited by
+ the size of virtual address space allocation for vmalloc */
+#if defined(__alpha__)
+#define V1_MAX_PAGES ((1 << 24) - 1)
+#elif defined(__mips__)
+#define V1_MAX_PAGES ((1 << 17) - 1)
+#elif defined(__sparc__)
+#define V1_MAX_PAGES (is_sparc64() ? ((3 << 29) - 1) : ((1 << 18) - 1))
+#elif defined(__ia64__)
/*
- * 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.
+ * The actual size will depend on the amount of virtual address space
+ * available to vmalloc the swap map.
*/
-volatile void fatal_error(const char * fmt_string)
+#define V1_MAX_PAGES ((1UL << 54) - 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))
+#define MIN_GOODPAGES 10
+
+static void __attribute__ ((__noreturn__)) usage(FILE *out)
{
- fprintf(stderr,fmt_string,program_name,device_name);
- exit(1);
+ fprintf(out,
+ _("\nUsage:\n"
+ " %s [options] device [size]\n"),
+ program_invocation_short_name);
+
+ fprintf(out, _(
+ "\nOptions:\n"
+ " -c, --check check bad blocks before creating the swap area\n"
+ " -f, --force allow swap size area be larger than device\n"
+ " -p, --pagesize SIZE specify page size in bytes\n"
+ " -L, --label LABEL specify label\n"
+ " -v, --swapversion NUM specify swap-space version number\n"
+ " -U, --uuid UUID specify the uuid to use\n"
+ " -V, --version output version information and exit\n"
+ " -h, --help display this help and exit\n\n"));
+
+ exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
-#define usage() fatal_error("Usage: %s [-c] /dev/name [blocks]\n")
-#define die(str) fatal_error("%s: " str "\n")
+static void
+page_bad(int page)
+{
+ struct swap_header_v1_2 *p = (struct swap_header_v1_2 *) signature_page;
+
+ if (badpages == MAX_BADPAGES)
+ errx(EXIT_FAILURE, _("too many bad pages"));
+ p->badpages[badpages] = page;
+ badpages++;
+}
-void check_blocks(void)
+static void
+check_blocks(void)
{
unsigned int current_page;
int do_seek = 1;
- static char buffer[PAGE_SIZE];
+ char *buffer;
+ buffer = xmalloc(pagesize);
current_page = 0;
while (current_page < PAGES) {
- if (!check) {
- bit_set(signature_page,current_page++);
- continue;
- }
- if (do_seek && lseek(DEV,current_page*PAGE_SIZE,SEEK_SET) !=
- current_page*PAGE_SIZE)
- 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++;
- continue;
- }
- bit_set(signature_page,current_page++);
+ if (do_seek && lseek(DEV,current_page*pagesize,SEEK_SET) !=
+ current_page*pagesize)
+ errx(EXIT_FAILURE, _("seek failed in check_blocks"));
+ if ((do_seek = (pagesize != read(DEV, buffer, pagesize))))
+ page_bad(current_page);
+ current_page++;
}
- 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(_("%lu bad pages\n"), badpages);
+ free(buffer);
+}
+
+/* return size in pages */
+static unsigned long long
+get_size(const char *file)
+{
+ int fd;
+ unsigned long long size;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ perror(file);
+ exit(EXIT_FAILURE);
+ }
+ if (blkdev_get_size(fd, &size) == 0)
+ size /= pagesize;
+
+ close(fd);
+ return size;
}
-static long valid_offset (int fd, int offset)
+/*
+ * Check to make certain that our new filesystem won't be created on
+ * an already mounted partition. Code adapted from mke2fs, Copyright
+ * (C) 1994 Theodore Ts'o. Also licensed under GPL.
+ * (C) 2006 Karel Zak -- port to mkswap
+ */
+static int
+check_mount(void)
{
- char ch;
+ FILE *f;
+ struct mntent *mnt;
- if (lseek (fd, offset, 0) < 0)
+ if ((f = setmntent (_PATH_MOUNTED, "r")) == NULL)
return 0;
- if (read (fd, &ch, 1) < 1)
+ while ((mnt = getmntent (f)) != NULL)
+ if (strcmp (device_name, mnt->mnt_fsname) == 0)
+ break;
+ endmntent (f);
+ if (!mnt)
return 0;
return 1;
}
-static int count_blocks (int fd)
+static void
+zap_bootbits(int fd, const char *devname, int force, int is_blkdev)
{
- int high, low;
+ char *type = NULL;
+ int whole = 0;
+ int zap = 1;
- low = 0;
- for (high = 1; valid_offset (fd, high); high *= 2)
- low = high;
- while (low < high - 1)
- {
- const int mid = (low + high) / 2;
+ if (!force) {
+ if (lseek(fd, 0, SEEK_SET) != 0)
+ errx(EXIT_FAILURE, _("unable to rewind swap-device"));
- if (valid_offset (fd, mid))
- low = mid;
- else
- high = mid;
- }
- valid_offset (fd, 0);
- return (low + 1);
-}
+ if (is_blkdev && is_whole_disk_fd(fd, devname)) {
+ /* don't zap bootbits on whole disk -- we know nothing
+ * about bootloaders on the device */
+ whole = 1;
+ zap = 0;
+ } else {
+#ifdef HAVE_LIBBLKID_INTERNAL
+ blkid_probe pr = blkid_new_probe();
+ if (!pr)
+ errx(EXIT_FAILURE, _("unable to alloc new libblkid probe"));
+ if (blkid_probe_set_device(pr, fd, 0, 0))
+ errx(EXIT_FAILURE, _("unable to assign device to libblkid probe"));
-static int get_size(const char *file)
-{
- int fd;
- int size;
+ blkid_probe_enable_partitions(pr, 1);
+ blkid_probe_enable_superblocks(pr, 0);
- fd = open(file, O_RDWR);
- if (fd < 0) {
- perror(file);
- exit(1);
+ if (blkid_do_fullprobe(pr) == 0)
+ blkid_probe_lookup_value(pr, "PTTYPE",
+ (const char **) &type, NULL);
+ if (type) {
+ type = xstrdup(type);
+ zap = 0;
+ }
+ blkid_free_probe(pr);
+#else
+ /* don't zap if compiled without libblkid */
+ zap = 0;
+#endif
+ }
}
- if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
- close(fd);
- return (size * 512);
+
+ if (zap) {
+ char buf[1024];
+
+ if (lseek(fd, 0, SEEK_SET) != 0)
+ errx(EXIT_FAILURE, _("unable to rewind swap-device"));
+
+ memset(buf, 0, sizeof(buf));
+ if (write_all(fd, buf, sizeof(buf)))
+ errx(EXIT_FAILURE, _("unable to erase bootbits sectors"));
+ return;
}
-
- size = count_blocks(fd);
- close(fd);
- return size;
+
+ warnx(_("%s: warning: don't erase bootbits sectors"),
+ devname);
+ if (type)
+ fprintf(stderr, _(" (%s partition table detected). "), type);
+ else if (whole)
+ fprintf(stderr, _(" on whole disk. "));
+ else
+ fprintf(stderr, _(" (compiled without libblkid). "));
+ fprintf(stderr, "Use -f to force.\n");
}
-int main(int argc, char ** argv)
-{
- char * tmp;
+int
+main(int argc, char **argv) {
struct stat statbuf;
- int goodpages;
-
- memset(signature_page,0,PAGE_SIZE);
- if (argc && *argv)
- program_name = *argv;
- while (argc-- > 1) {
- argv++;
- if (argv[0][0] != '-')
- if (device_name) {
- PAGES = strtol(argv[0],&tmp,0)>>(PAGE_SHIFT-10);
- if (*tmp)
- usage();
- } else
- device_name = argv[0];
- else while (*++argv[0])
- switch (argv[0][0]) {
- case 'c': check=1; break;
- default: usage();
- }
+ struct swap_header_v1_2 *hdr;
+ int c;
+ unsigned long long maxpages;
+ unsigned long long goodpages;
+ unsigned long long sz;
+ off_t offset;
+ int force = 0;
+ long version = 1;
+ char *block_count = 0;
+ char *opt_label = NULL;
+ unsigned char *uuid = NULL;
+#ifdef HAVE_LIBUUID
+ const char *opt_uuid = NULL;
+ uuid_t uuid_dat;
+#endif
+ static const struct option longopts[] = {
+ { "check", no_argument, 0, 'c' },
+ { "force", no_argument, 0, 'f' },
+ { "pagesize", required_argument, 0, 'p' },
+ { "label", required_argument, 0, 'L' },
+ { "swapversion", required_argument, 0, 'v' },
+ { "uuid", required_argument, 0, 'U' },
+ { "version", no_argument, 0, 'V' },
+ { "help", no_argument, 0, 'h' },
+ { NULL, 0, 0, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+
+ while((c = getopt_long(argc, argv, "cfp:L:v:U:Vh", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'c':
+ check=1;
+ break;
+ case 'f':
+ force=1;
+ break;
+ case 'p':
+ user_pagesize = strtol_or_err(optarg, _("parse page size failed"));
+ break;
+ case 'L':
+ opt_label = optarg;
+ break;
+ case 'v':
+ version = strtol_or_err(optarg, _("parse version number failed"));
+ break;
+ case 'U':
+#ifdef HAVE_LIBUUID
+ opt_uuid = optarg;
+#else
+ warnx(_("warning: ignore -U (UUIDs are unsupported by %s)"),
+ program_invocation_short_name);
+#endif
+ break;
+ case 'V':
+ printf(_("%s from %s\n"), program_invocation_short_name,
+ PACKAGE_STRING);
+ exit(EXIT_SUCCESS);
+ case 'h':
+ usage(stdout);
+ default:
+ usage(stderr);
+ }
}
- if (device_name && !PAGES) {
- PAGES = get_size(device_name) / PAGE_SIZE;
+ if (optind < argc)
+ device_name = argv[optind++];
+ if (optind < argc)
+ block_count = argv[optind++];
+ if (optind != argc) {
+ warnx(("only one device as argument is currently supported."));
+ usage(stderr);
}
+
+ if (version != 1)
+ errx(EXIT_FAILURE,
+ _("does not support swapspace version %lu."),
+ version);
+
+#ifdef HAVE_LIBUUID
+ if(opt_uuid) {
+ if (uuid_parse(opt_uuid, uuid_dat) != 0)
+ errx(EXIT_FAILURE, _("error: UUID parsing failed"));
+ } else
+ uuid_generate(uuid_dat);
+ uuid = uuid_dat;
+#endif
+
+ init_signature_page(); /* get pagesize */
+
if (!device_name) {
- fprintf(stderr,
- "%s: error: Nowhere to set up swap on?\n",
- program_name);
- usage();
- }
- if (PAGES < 10) {
- fprintf(stderr,
- "%s: error: swap area needs to be at least %ldkB\n",
- program_name, 10 * PAGE_SIZE / 1024);
- usage();
- }
- if (PAGES > 8 * (PAGE_SIZE - 10)) {
- PAGES = 8 * (PAGE_SIZE - 10);
- fprintf(stderr, "%s: warning: truncating swap area to %ldkB\n",
- program_name, PAGES * PAGE_SIZE / 1024);
- }
- DEV = open(device_name,O_RDWR);
- if (DEV < 0 || fstat(DEV, &statbuf) < 0) {
+ warnx(_("error: Nowhere to set up swap on?"));
+ usage(stderr);
+ }
+ if (block_count) {
+ /* this silly user specified the number of blocks explicitly */
+ long long blks;
+
+ blks = strtoll_or_err(block_count, "parse block count failed");
+ if (blks < 0)
+ usage(stderr);
+
+ PAGES = blks / (pagesize / 1024);
+ }
+ sz = get_size(device_name);
+ if (!PAGES)
+ PAGES = sz;
+ else if (PAGES > sz && !force) {
+ errx(EXIT_FAILURE,
+ _("error: "
+ "size %llu KiB is larger than device size %llu KiB"),
+ PAGES*(pagesize/1024), sz*(pagesize/1024));
+ }
+
+ if (PAGES < MIN_GOODPAGES) {
+ warnx(_("error: swap area needs to be at least %ld KiB"),
+ (long)(MIN_GOODPAGES * pagesize/1024));
+ usage(stderr);
+ }
+
+#ifdef __linux__
+ if (get_linux_version() >= KERNEL_VERSION(2,3,4))
+ maxpages = UINT_MAX + 1ULL;
+ else if (get_linux_version() >= KERNEL_VERSION(2,2,1))
+ maxpages = V1_MAX_PAGES;
+ else
+#endif
+ maxpages = V1_OLD_MAX_PAGES;
+
+ if (PAGES > maxpages) {
+ PAGES = maxpages;
+ warnx(_("warning: truncating swap area to %llu KiB"),
+ PAGES * pagesize / 1024);
+ }
+
+ if (stat(device_name, &statbuf) < 0) {
+ perror(device_name);
+ exit(EXIT_FAILURE);
+ }
+ if (S_ISBLK(statbuf.st_mode))
+ DEV = open(device_name, O_RDWR | O_EXCL);
+ else
+ DEV = open(device_name, O_RDWR);
+
+ if (DEV < 0) {
perror(device_name);
- exit(1);
+ exit(EXIT_FAILURE);
}
+
+ /* Want a block device. Probably not /dev/hda or /dev/hdb. */
if (!S_ISBLK(statbuf.st_mode))
check=0;
else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
- die("Will not try to make swapdevice on '%s'");
- check_blocks();
- if (!bit_test_and_clear(signature_page,0))
- die("fatal: first page unreadable");
+ errx(EXIT_FAILURE, _("error: "
+ "will not try to make swapdevice on '%s'"),
+ device_name);
+ else if (check_mount())
+ errx(EXIT_FAILURE, _("error: "
+ "%s is mounted; will not make swapspace."),
+ device_name);
+
+ if (check)
+ check_blocks();
+
+ zap_bootbits(DEV, device_name, force, S_ISBLK(statbuf.st_mode));
+
+ hdr = (struct swap_header_v1_2 *) signature_page;
+ hdr->version = 1;
+ hdr->last_page = PAGES - 1;
+ hdr->nr_badpages = badpages;
+
+ if (badpages > PAGES - MIN_GOODPAGES)
+ errx(EXIT_FAILURE, _("Unable to set up swap-space: unreadable"));
+
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))
- die("unable to rewind swap-device");
- if (PAGE_SIZE != write(DEV, signature_page, PAGE_SIZE))
- die("unable to write signature page");
- return 0;
+ printf(_("Setting up swapspace version 1, size = %llu KiB\n"),
+ goodpages * pagesize / 1024);
+
+ write_signature("SWAPSPACE2");
+ write_uuid_and_label(uuid, opt_label);
+
+ offset = 1024;
+ if (lseek(DEV, offset, SEEK_SET) != offset)
+ errx(EXIT_FAILURE, _("unable to rewind swap-device"));
+ if (write_all(DEV, (char *) signature_page + offset,
+ pagesize - offset) == -1)
+ err(EXIT_FAILURE,
+ _("%s: unable to write signature page"),
+ device_name);
+
+ /*
+ * A subsequent swapon() will fail if the signature
+ * is not actually on disk. (This is a kernel bug.)
+ */
+#ifdef HAVE_FSYNC
+ if (fsync(DEV))
+ errx(EXIT_FAILURE, _("fsync failed"));
+#endif
+
+#ifdef HAVE_LIBSELINUX
+ if (S_ISREG(statbuf.st_mode) && is_selinux_enabled() > 0) {
+ security_context_t context_string;
+ security_context_t oldcontext;
+ context_t newcontext;
+
+ if (fgetfilecon(DEV, &oldcontext) < 0) {
+ if (errno != ENODATA)
+ err(EXIT_FAILURE,
+ _("%s: unable to obtain selinux file label"),
+ device_name);
+ if (matchpathcon(device_name, statbuf.st_mode, &oldcontext))
+ errx(EXIT_FAILURE, _("unable to matchpathcon()"));
+ }
+ if (!(newcontext = context_new(oldcontext)))
+ errx(EXIT_FAILURE, _("unable to create new selinux context"));
+ if (context_type_set(newcontext, SELINUX_SWAPFILE_TYPE))
+ errx(EXIT_FAILURE, _("couldn't compute selinux context"));
+
+ context_string = context_str(newcontext);
+
+ if (strcmp(context_string, oldcontext)!=0) {
+ if (fsetfilecon(DEV, context_string))
+ err(EXIT_FAILURE, _("unable to relabel %s to %s"),
+ device_name, context_string);
+ }
+ context_free(newcontext);
+ freecon(oldcontext);
+ }
+#endif
+ return EXIT_SUCCESS;
}
projects / thirdparty / util-linux.git / blobdiff