# include <blkid.h>
#endif
-static char *device_name = NULL;
-static int DEV = -1;
-static unsigned long long PAGES = 0;
-static unsigned long badpages = 0;
-static int check = 0;
+#define MIN_GOODPAGES 10
#define SELINUX_SWAPFILE_TYPE "swapfile_t"
-static unsigned int user_pagesize;
-static unsigned int pagesize;
-static unsigned long *signature_page = NULL;
+struct mkswap_control {
+ struct swap_header_v1_2 *hdr;
+ char *device_name;
+ int fd;
+ unsigned long long nr_pages;
+ unsigned long badpages;
+ int user_pagesize;
+ int pagesize;
+ void *signature_page;
+ char *opt_label;
+ unsigned char *uuid;
+ unsigned int
+ check:1,
+ force:1;
+};
static void
-init_signature_page(void)
+init_signature_page(struct mkswap_control *ctl)
{
- unsigned int kernel_pagesize = pagesize = getpagesize();
+ int kernel_pagesize = ctl->pagesize = getpagesize();
- if (user_pagesize) {
- if (!is_power_of_2(user_pagesize) ||
- user_pagesize < sizeof(struct swap_header_v1_2) + 10)
+ if (ctl->user_pagesize) {
+ if (ctl->user_pagesize < 0 || !is_power_of_2(ctl->user_pagesize) ||
+ (size_t) ctl->user_pagesize < sizeof(struct swap_header_v1_2) + 10)
errx(EXIT_FAILURE,
_("Bad user-specified page size %u"),
- user_pagesize);
- pagesize = user_pagesize;
+ ctl->user_pagesize);
+ ctl->pagesize = ctl->user_pagesize;
}
- if (user_pagesize && user_pagesize != kernel_pagesize)
+ if (ctl->user_pagesize && ctl->user_pagesize != kernel_pagesize)
warnx(_("Using user-specified page size %d, "
"instead of the system value %d"),
- pagesize, kernel_pagesize);
+ ctl->pagesize, kernel_pagesize);
- signature_page = (unsigned long *) xcalloc(1, pagesize);
+ ctl->signature_page = (unsigned long *) xcalloc(1, ctl->pagesize);
}
static void
-write_signature(char *sig)
+write_signature(const struct mkswap_control *ctl)
{
- char *sp = (char *) signature_page;
+ char *sp = (char *) ctl->signature_page;
- strncpy(sp + pagesize - SWAP_SIGNATURE_SZ, sig, SWAP_SIGNATURE_SZ);
+ strncpy(sp + ctl->pagesize - SWAP_SIGNATURE_SZ, SWAP_SIGNATURE, SWAP_SIGNATURE_SZ);
}
static void
-write_uuid_and_label(unsigned char *uuid, char *volume_name)
+write_uuid_and_label(const struct mkswap_control *ctl)
{
struct swap_header_v1_2 *h;
- 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))
+ h = (struct swap_header_v1_2 *) ctl->signature_page;
+ if (ctl->uuid)
+ memcpy(h->uuid, ctl->uuid, sizeof(h->uuid));
+ if (ctl->opt_label) {
+ xstrncpy(h->volume_name, ctl->opt_label, sizeof(h->volume_name));
+ if (strlen(ctl->opt_label) > strlen(h->volume_name))
warnx(_("Label was truncated."));
}
- if (uuid || volume_name) {
- if (volume_name)
+ if (ctl->uuid || ctl->opt_label) {
+ if (ctl->opt_label)
printf("LABEL=%s, ", h->volume_name);
else
printf(_("no label, "));
#ifdef HAVE_LIBUUID
- if (uuid) {
+ if (ctl->uuid) {
char uuid_string[37];
- uuid_unparse(uuid, uuid_string);
+ uuid_unparse(ctl->uuid, uuid_string);
printf("UUID=%s\n", uuid_string);
} else
#endif
}
}
-#define MAX_BADPAGES ((pagesize-1024-128*sizeof(int)-10)/sizeof(int))
-#define MIN_GOODPAGES 10
-
static void __attribute__ ((__noreturn__)) usage(FILE *out)
{
fprintf(out,
}
static void
-page_bad(int page)
+page_bad(struct mkswap_control *ctl, int page)
{
- struct swap_header_v1_2 *p = (struct swap_header_v1_2 *) signature_page;
+ struct swap_header_v1_2 *p = (struct swap_header_v1_2 *)ctl->signature_page;
+ const unsigned long max_badpages = (ctl->pagesize - 1024 - 128 * sizeof(int) - 10) / sizeof(int);
- if (badpages == MAX_BADPAGES)
+ if (ctl->badpages == max_badpages)
errx(EXIT_FAILURE, _("too many bad pages"));
- p->badpages[badpages] = page;
- badpages++;
+ p->badpages[ctl->badpages] = page;
+ ctl->badpages++;
}
static void
-check_blocks(void)
+check_blocks(struct mkswap_control *ctl)
{
unsigned int current_page;
int do_seek = 1;
char *buffer;
- buffer = xmalloc(pagesize);
+ buffer = xmalloc(ctl->pagesize);
current_page = 0;
- while (current_page < PAGES) {
-
+ while (current_page < ctl->nr_pages) {
ssize_t rc;
- if (do_seek && lseek(DEV,current_page*pagesize,SEEK_SET) !=
- current_page*pagesize)
+ if (do_seek && lseek(ctl->fd, current_page * ctl->pagesize, SEEK_SET) !=
+ current_page * ctl->pagesize)
errx(EXIT_FAILURE, _("seek failed in check_blocks"));
- rc = read(DEV, buffer, pagesize);
- do_seek = (rc < 0 || (size_t) rc != pagesize);
+ rc = read(ctl->fd, buffer, ctl->pagesize);
+ do_seek = (rc < 0 || rc != ctl->pagesize);
if (do_seek)
- page_bad(current_page);
+ page_bad(ctl, current_page);
current_page++;
}
- printf(P_("%lu bad page\n", "%lu bad pages\n", badpages), badpages);
+ printf(P_("%lu bad page\n", "%lu bad pages\n", ctl->badpages), ctl->badpages);
free(buffer);
}
/* return size in pages */
static unsigned long long
-get_size(const char *file)
+get_size(const struct mkswap_control *ctl)
{
int fd;
unsigned long long size;
- fd = open(file, O_RDONLY);
+ fd = open(ctl->device_name, O_RDONLY);
if (fd < 0)
- err(EXIT_FAILURE, _("cannot open %s"), file);
+ err(EXIT_FAILURE, _("cannot open %s"), ctl->device_name);
if (blkdev_get_size(fd, &size) == 0)
- size /= pagesize;
+ size /= ctl->pagesize;
close(fd);
return size;
int
main(int argc, char **argv) {
+ struct mkswap_control ctl = { .fd = -1, 0 };
struct stat statbuf;
- struct swap_header_v1_2 *hdr;
int c;
unsigned long long goodpages;
unsigned long long sz;
off_t offset;
- int force = 0;
int version = SWAP_VERSION;
char *block_count = 0;
- char *opt_label = NULL;
- unsigned char *uuid = NULL;
#ifdef HAVE_LIBUUID
const char *opt_uuid = NULL;
uuid_t uuid_dat;
while((c = getopt_long(argc, argv, "cfp:L:v:U:Vh", longopts, NULL)) != -1) {
switch (c) {
case 'c':
- check=1;
+ ctl.check = 1;
break;
case 'f':
- force=1;
+ ctl.force = 1;
break;
case 'p':
- user_pagesize = strtou32_or_err(optarg, _("parsing page size failed"));
+ ctl.user_pagesize = strtou32_or_err(optarg, _("parsing page size failed"));
break;
case 'L':
- opt_label = optarg;
+ ctl.opt_label = optarg;
break;
case 'v':
version = strtos32_or_err(optarg, _("parsing version number failed"));
+ if (version != SWAP_VERSION)
+ errx(EXIT_FAILURE,
+ _("swapspace version %d is not supported"), version);
break;
case 'U':
#ifdef HAVE_LIBUUID
}
}
if (optind < argc)
- device_name = argv[optind++];
+ ctl.device_name = argv[optind++];
if (optind < argc)
block_count = argv[optind++];
if (optind != argc) {
usage(stderr);
}
- if (version != SWAP_VERSION)
- errx(EXIT_FAILURE,
- _("swapspace version %d is not supported"), version);
-
#ifdef HAVE_LIBUUID
if(opt_uuid) {
if (uuid_parse(opt_uuid, uuid_dat) != 0)
errx(EXIT_FAILURE, _("error: parsing UUID failed"));
} else
uuid_generate(uuid_dat);
- uuid = uuid_dat;
+ ctl.uuid = uuid_dat;
#endif
- init_signature_page(); /* get pagesize */
+ init_signature_page(&ctl); /* get pagesize and allocate signature page */
- if (!device_name) {
+ if (!ctl.device_name) {
warnx(_("error: Nowhere to set up swap on?"));
usage(stderr);
}
/* this silly user specified the number of blocks explicitly */
uint64_t blks = strtou64_or_err(block_count,
_("invalid block count argument"));
- PAGES = blks / (pagesize / 1024);
+ ctl.nr_pages = blks / (ctl.pagesize / 1024);
}
- sz = get_size(device_name);
- if (!PAGES)
- PAGES = sz;
- else if (PAGES > sz && !force)
+ sz = get_size(&ctl);
+ if (!ctl.nr_pages)
+ ctl.nr_pages = sz;
+ else if (ctl.nr_pages > sz && !ctl.force)
errx(EXIT_FAILURE,
_("error: "
"size %llu KiB is larger than device size %llu KiB"),
- PAGES*(pagesize/1024), sz*(pagesize/1024));
+ ctl.nr_pages * (ctl.pagesize / 1024), sz * (ctl.pagesize / 1024));
- if (PAGES < MIN_GOODPAGES)
+ if (ctl.nr_pages < MIN_GOODPAGES)
errx(EXIT_FAILURE,
_("error: swap area needs to be at least %ld KiB"),
- (long)(MIN_GOODPAGES * pagesize / 1024));
- if (PAGES > UINT32_MAX) {
+ (long)(MIN_GOODPAGES * ctl.pagesize / 1024));
+ if (ctl.nr_pages > UINT32_MAX) {
/* true when swap is bigger than 17.59 terabytes */
- PAGES = UINT32_MAX;
+ ctl.nr_pages = UINT32_MAX;
warnx(_("warning: truncating swap area to %llu KiB"),
- PAGES * pagesize / 1024);
+ ctl.nr_pages * ctl.pagesize / 1024);
}
- if (is_mounted(device_name))
+ if (is_mounted(ctl.device_name))
errx(EXIT_FAILURE, _("error: "
"%s is mounted; will not make swapspace"),
- device_name);
+ ctl.device_name);
- if (stat(device_name, &statbuf) < 0)
- err(EXIT_FAILURE, _("stat failed %s"), device_name);
+ if (stat(ctl.device_name, &statbuf) < 0)
+ err(EXIT_FAILURE, _("stat failed %s"), ctl.device_name);
if (S_ISBLK(statbuf.st_mode))
- DEV = open(device_name, O_RDWR | O_EXCL);
+ ctl.fd = open(ctl.device_name, O_RDWR | O_EXCL);
else
- DEV = open(device_name, O_RDWR);
- if (DEV < 0)
- err(EXIT_FAILURE, _("cannot open %s"), device_name);
+ ctl.fd = open(ctl.device_name, O_RDWR);
+ if (ctl.fd < 0)
+ err(EXIT_FAILURE, _("cannot open %s"), ctl.device_name);
if (!S_ISBLK(statbuf.st_mode))
- check=0;
- else if (blkdev_is_misaligned(DEV))
- warnx(_("warning: %s is misaligned"), device_name);
+ ctl.check = 0;
+ else if (blkdev_is_misaligned(ctl.fd))
+ warnx(_("warning: %s is misaligned"), ctl.device_name);
- if (check)
- check_blocks();
+ if (ctl.check)
+ check_blocks(&ctl);
- wipe_device(DEV, device_name, force);
+ wipe_device(ctl.fd, ctl.device_name, ctl.force);
- hdr = (struct swap_header_v1_2 *) signature_page;
- hdr->version = version;
- hdr->last_page = PAGES - 1;
- hdr->nr_badpages = badpages;
+ ctl.hdr = (struct swap_header_v1_2 *) ctl.signature_page;
+ ctl.hdr->version = version;
+ ctl.hdr->last_page = ctl.nr_pages - 1;
+ ctl.hdr->nr_badpages = ctl.badpages;
- if (badpages > PAGES - MIN_GOODPAGES)
+ if ((ctl.nr_pages - MIN_GOODPAGES) < ctl.badpages)
errx(EXIT_FAILURE, _("Unable to set up swap-space: unreadable"));
- goodpages = PAGES - badpages - 1;
+ goodpages = ctl.nr_pages - ctl.badpages - 1;
printf(_("Setting up swapspace version %d, size = %llu KiB\n"),
- version, goodpages * pagesize / 1024);
+ version, goodpages * ctl.pagesize / 1024);
- write_signature(SWAP_SIGNATURE);
- write_uuid_and_label(uuid, opt_label);
+ write_signature(&ctl);
+ write_uuid_and_label(&ctl);
offset = 1024;
- if (lseek(DEV, offset, SEEK_SET) != offset)
+ if (lseek(ctl.fd, offset, SEEK_SET) != offset)
errx(EXIT_FAILURE, _("unable to rewind swap-device"));
- if (write_all(DEV, (char *) signature_page + offset,
- pagesize - offset) == -1)
+ if (write_all(ctl.fd, (char *) ctl.signature_page + offset,
+ ctl.pagesize - offset) == -1)
err(EXIT_FAILURE,
_("%s: unable to write signature page"),
- device_name);
+ ctl.device_name);
#ifdef HAVE_LIBSELINUX
if (S_ISREG(statbuf.st_mode) && is_selinux_enabled() > 0) {
security_context_t oldcontext;
context_t newcontext;
- if (fgetfilecon(DEV, &oldcontext) < 0) {
+ if (fgetfilecon(ctl.fd, &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))
+ ctl.device_name);
+ if (matchpathcon(ctl.device_name, statbuf.st_mode, &oldcontext))
errx(EXIT_FAILURE, _("unable to matchpathcon()"));
}
if (!(newcontext = context_new(oldcontext)))
context_string = context_str(newcontext);
if (strcmp(context_string, oldcontext)!=0) {
- if (fsetfilecon(DEV, context_string))
+ if (fsetfilecon(ctl.fd, context_string))
err(EXIT_FAILURE, _("unable to relabel %s to %s"),
- device_name, context_string);
+ ctl.device_name, context_string);
}
context_free(newcontext);
freecon(oldcontext);
* is not actually on disk. (This is a kernel bug.)
* The fsync() in close_fd() will take care of writing.
*/
- if (close_fd(DEV) != 0)
+ if (close_fd(ctl.fd) != 0)
err(EXIT_FAILURE, _("write failed"));
return EXIT_SUCCESS;
}
projects / thirdparty / util-linux.git / commitdiff
