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util-linux/sys-utils/swapon.c

892 lines
21 KiB

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <stdint.h>
#include <ctype.h>
#include <libsmartcols.h>
#include "c.h"
#include "nls.h"
#include "bitops.h"
#include "blkdev.h"
#include "pathnames.h"
#include "xalloc.h"
#include "strutils.h"
#include "closestream.h"
#include "swapheader.h"
#include "swapprober.h"
#include "swapon-common.h"
#define PATH_MKSWAP "/sbin/mkswap"
#ifdef HAVE_SYS_SWAP_H
# include <sys/swap.h>
#endif
#ifndef SWAP_FLAG_DISCARD
# define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */
#endif
#ifndef SWAP_FLAG_DISCARD_ONCE
# define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */
#endif
#ifndef SWAP_FLAG_DISCARD_PAGES
# define SWAP_FLAG_DISCARD_PAGES 0x40000 /* discard page-clusters after use */
#endif
#define SWAP_FLAGS_DISCARD_VALID (SWAP_FLAG_DISCARD | SWAP_FLAG_DISCARD_ONCE | \
SWAP_FLAG_DISCARD_PAGES)
#ifndef SWAP_FLAG_PREFER
# define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
#endif
#ifndef SWAP_FLAG_PRIO_MASK
# define SWAP_FLAG_PRIO_MASK 0x7fff
#endif
#ifndef SWAP_FLAG_PRIO_SHIFT
# define SWAP_FLAG_PRIO_SHIFT 0
#endif
#ifndef SWAPON_HAS_TWO_ARGS
/* libc is insane, let's call the kernel */
# include <sys/syscall.h>
# define swapon(path, flags) syscall(SYS_swapon, path, flags)
#endif
#define QUIET 1
#define CANONIC 1
#define MAX_PAGESIZE (64 * 1024)
enum {
SIG_SWAPSPACE = 1,
SIG_SWSUSPEND
};
static int all;
static int priority = -1; /* non-prioritized swap by default */
static int discard; /* don't send swap discards by default */
/* If true, don't complain if the device/file doesn't exist */
static int ifexists;
static int fixpgsz;
static int verbose;
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* SCOLS_FL_* */
const char *help;
};
/* basic output flags */
static int no_headings;
static int raw;
enum {
COL_PATH,
COL_TYPE,
COL_SIZE,
COL_USED,
COL_PRIO,
COL_UUID,
COL_LABEL
};
struct colinfo infos[] = {
[COL_PATH] = { "NAME", 0.20, 0, N_("device file or partition path") },
[COL_TYPE] = { "TYPE", 0.20, SCOLS_FL_TRUNC, N_("type of the device")},
[COL_SIZE] = { "SIZE", 0.20, SCOLS_FL_RIGHT, N_("size of the swap area")},
[COL_USED] = { "USED", 0.20, SCOLS_FL_RIGHT, N_("bytes in use")},
[COL_PRIO] = { "PRIO", 0.20, SCOLS_FL_RIGHT, N_("swap priority")},
[COL_UUID] = { "UUID", 0.20, 0, N_("swap uuid")},
[COL_LABEL] = { "LABEL", 0.20, 0, N_("swap label")},
};
static int columns[ARRAY_SIZE(infos) * 2];
static int ncolumns;
static int column_name_to_id(const char *name, size_t namesz)
{
size_t i;
assert(name);
for (i = 0; i < ARRAY_SIZE(infos); i++) {
const char *cn = infos[i].name;
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
static inline int get_column_id(int num)
{
assert(num < ncolumns);
assert(columns[num] < (int) ARRAY_SIZE(infos));
return columns[num];
}
static inline struct colinfo *get_column_info(unsigned num)
{
return &infos[get_column_id(num)];
}
static void add_scols_line(struct libscols_table *table, struct libmnt_fs *fs, int bytes)
{
int i;
struct libscols_line *line;
blkid_probe pr = NULL;
const char *data;
assert(table);
assert(fs);
line = scols_table_new_line(table, NULL);
if (!line)
err(EXIT_FAILURE, _("failed to initialize output line"));
data = mnt_fs_get_source(fs);
if (access(data, R_OK) == 0)
pr = get_swap_prober(data);
for (i = 0; i < ncolumns; i++) {
char *str = NULL;
off_t size;
switch (get_column_id(i)) {
case COL_PATH:
xasprintf(&str, "%s", mnt_fs_get_source(fs));
break;
case COL_TYPE:
xasprintf(&str, "%s", mnt_fs_get_swaptype(fs));
break;
case COL_SIZE:
size = mnt_fs_get_size(fs);
size *= 1024; /* convert to bytes */
if (bytes)
xasprintf(&str, "%jd", size);
else
str = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
break;
case COL_USED:
size = mnt_fs_get_usedsize(fs);
size *= 1024; /* convert to bytes */
if (bytes)
xasprintf(&str, "%jd", size);
else
str = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
break;
case COL_PRIO:
xasprintf(&str, "%d", mnt_fs_get_priority(fs));
break;
case COL_UUID:
if (pr && !blkid_probe_lookup_value(pr, "UUID", &data, NULL))
xasprintf(&str, "%s", data);
break;
case COL_LABEL:
if (pr && !blkid_probe_lookup_value(pr, "LABEL", &data, NULL))
xasprintf(&str, "%s", data);
break;
default:
break;
}
if (str)
scols_line_refer_data(line, i, str);
}
if (pr)
blkid_free_probe(pr);
return;
}
static int display_summary(void)
{
struct libmnt_table *st = get_swaps();
struct libmnt_iter *itr;
struct libmnt_fs *fs;
if (!st)
return -1;
if (mnt_table_is_empty(st))
return 0;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
printf(_("%s\t\t\t\tType\t\tSize\tUsed\tPriority\n"), _("Filename"));
while (mnt_table_next_fs(st, itr, &fs) == 0) {
printf("%-39s\t%-8s\t%jd\t%jd\t%d\n",
mnt_fs_get_source(fs),
mnt_fs_get_swaptype(fs),
mnt_fs_get_size(fs),
mnt_fs_get_usedsize(fs),
mnt_fs_get_priority(fs));
}
mnt_free_iter(itr);
return 0;
}
static int show_table(int bytes)
{
struct libmnt_table *st = get_swaps();
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int i;
struct libscols_table *table = NULL;
if (!st)
return -1;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
scols_init_debug(0);
table = scols_new_table();
if (!table)
err(EXIT_FAILURE, _("failed to initialize output table"));
scols_table_enable_raw(table, raw);
scols_table_enable_noheadings(table, no_headings);
for (i = 0; i < ncolumns; i++) {
struct colinfo *col = get_column_info(i);
if (!scols_table_new_column(table, col->name, col->whint, col->flags))
err(EXIT_FAILURE, _("failed to initialize output column"));
}
while (mnt_table_next_fs(st, itr, &fs) == 0)
add_scols_line(table, fs, bytes);
scols_print_table(table);
scols_unref_table(table);
mnt_free_iter(itr);
return 0;
}
/* calls mkswap */
static int swap_reinitialize(const char *device,
const char *label, const char *uuid)
{
pid_t pid;
int status, ret;
char *cmd[7];
int idx=0;
warnx(_("%s: reinitializing the swap."), device);
switch((pid=fork())) {
case -1: /* fork error */
warn(_("fork failed"));
return -1;
case 0: /* child */
cmd[idx++] = PATH_MKSWAP;
if (label && *label) {
cmd[idx++] = "-L";
cmd[idx++] = (char *) label;
}
if (uuid && *uuid) {
cmd[idx++] = "-U";
cmd[idx++] = (char *) uuid;
}
cmd[idx++] = (char *) device;
cmd[idx++] = NULL;
execv(cmd[0], cmd);
err(EXIT_FAILURE, _("failed to execute %s"), cmd[0]);
default: /* parent */
do {
if ((ret = waitpid(pid, &status, 0)) < 0
&& errno == EINTR)
continue;
else if (ret < 0) {
warn(_("waitpid failed"));
return -1;
}
} while (0);
/* mkswap returns: 0=suss, 1=error */
if (WIFEXITED(status) && WEXITSTATUS(status)==0)
return 0; /* ok */
break;
}
return -1; /* error */
}
static int swap_rewrite_signature(const char *devname, unsigned int pagesize)
{
int fd, rc = -1;
fd = open(devname, O_WRONLY);
if (fd == -1) {
warn(_("cannot open %s"), devname);
return -1;
}
if (lseek(fd, pagesize - SWAP_SIGNATURE_SZ, SEEK_SET) < 0) {
warn(_("%s: lseek failed"), devname);
goto err;
}
if (write(fd, (void *) SWAP_SIGNATURE,
SWAP_SIGNATURE_SZ) != SWAP_SIGNATURE_SZ) {
warn(_("%s: write signature failed"), devname);
goto err;
}
rc = 0;
err:
if (close_fd(fd) != 0) {
warn(_("write failed: %s"), devname);
rc = -1;
}
return rc;
}
static int swap_detect_signature(const char *buf, int *sig)
{
if (memcmp(buf, SWAP_SIGNATURE, SWAP_SIGNATURE_SZ) == 0)
*sig = SIG_SWAPSPACE;
else if (memcmp(buf, "S1SUSPEND", 9) == 0 ||
memcmp(buf, "S2SUSPEND", 9) == 0 ||
memcmp(buf, "ULSUSPEND", 9) == 0 ||
memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0 ||
memcmp(buf, "LINHIB0001", 10) == 0)
*sig = SIG_SWSUSPEND;
else
return 0;
return 1;
}
static char *swap_get_header(int fd, int *sig, unsigned int *pagesize)
{
char *buf;
ssize_t datasz;
unsigned int page;
*pagesize = 0;
*sig = 0;
buf = xmalloc(MAX_PAGESIZE);
datasz = read(fd, buf, MAX_PAGESIZE);
if (datasz == (ssize_t) -1)
goto err;
for (page = 0x1000; page <= MAX_PAGESIZE; page <<= 1) {
/* skip 32k pagesize since this does not seem to
* be supported */
if (page == 0x8000)
continue;
/* the smallest swap area is PAGE_SIZE*10, it means
* 40k, that's less than MAX_PAGESIZE */
if (datasz < 0 || (size_t) datasz < (page - SWAP_SIGNATURE_SZ))
break;
if (swap_detect_signature(buf + page - SWAP_SIGNATURE_SZ, sig)) {
*pagesize = page;
break;
}
}
if (*pagesize)
return buf;
err:
free(buf);
return NULL;
}
/* returns real size of swap space */
static unsigned long long swap_get_size(const char *hdr, const char *devname,
unsigned int pagesize)
{
unsigned int last_page = 0;
const unsigned int swap_version = SWAP_VERSION;
int flip = 0;
struct swap_header_v1_2 *s;
s = (struct swap_header_v1_2 *) hdr;
if (s->version == swap_version) {
last_page = s->last_page;
} else if (swab32(s->version) == swap_version) {
flip = 1;
last_page = swab32(s->last_page);
}
if (verbose)
warnx(_("%s: found swap signature: version %ud, "
"page-size %d, %s byte order"),
devname,
swap_version,
pagesize / 1024,
flip ? _("different") : _("same"));
return ((unsigned long long) last_page + 1) * pagesize;
}
static void swap_get_info(const char *hdr, char **label, char **uuid)
{
struct swap_header_v1_2 *s = (struct swap_header_v1_2 *) hdr;
if (s && *s->volume_name && label)
*label = xstrdup(s->volume_name);
if (s && *s->uuid && uuid) {
const unsigned char *u = s->uuid;
char str[37];
snprintf(str, sizeof(str),
"%02x%02x%02x%02x-"
"%02x%02x-%02x%02x-"
"%02x%02x-%02x%02x%02x%02x%02x%02x",
u[0], u[1], u[2], u[3],
u[4], u[5], u[6], u[7],
u[8], u[9], u[10], u[11], u[12], u[13], u[14], u[15]);
*uuid = xstrdup(str);
}
}
static int swapon_checks(const char *special)
{
struct stat st;
int fd = -1, sig;
char *hdr = NULL;
unsigned int pagesize;
unsigned long long devsize = 0;
int permMask;
if (stat(special, &st) < 0) {
warn(_("stat failed %s"), special);
goto err;
}
permMask = S_ISBLK(st.st_mode) ? 07007 : 07077;
if ((st.st_mode & permMask) != 0)
warnx(_("%s: insecure permissions %04o, %04o suggested."),
special, st.st_mode & 07777,
~permMask & 0666);
if (S_ISREG(st.st_mode) && st.st_uid != 0)
warnx(_("%s: insecure file owner %d, 0 (root) suggested."),
special, st.st_uid);
/* test for holes by LBT */
if (S_ISREG(st.st_mode)) {
if (st.st_blocks * 512 < st.st_size) {
warnx(_("%s: skipping - it appears to have holes."),
special);
goto err;
}
devsize = st.st_size;
}
fd = open(special, O_RDONLY);
if (fd == -1) {
warn(_("cannot open %s"), special);
goto err;
}
if (S_ISBLK(st.st_mode) && blkdev_get_size(fd, &devsize)) {
warnx(_("%s: get size failed"), special);
goto err;
}
hdr = swap_get_header(fd, &sig, &pagesize);
if (!hdr) {
warnx(_("%s: read swap header failed"), special);
goto err;
}
if (sig == SIG_SWAPSPACE && pagesize) {
unsigned long long swapsize =
swap_get_size(hdr, special, pagesize);
int syspg = getpagesize();
if (verbose)
warnx(_("%s: pagesize=%d, swapsize=%llu, devsize=%llu"),
special, pagesize, swapsize, devsize);
if (swapsize > devsize) {
if (verbose)
warnx(_("%s: last_page 0x%08llx is larger"
" than actual size of swapspace"),
special, swapsize);
} else if (syspg < 0 || (unsigned) syspg != pagesize) {
if (fixpgsz) {
char *label = NULL, *uuid = NULL;
int rc;
swap_get_info(hdr, &label, &uuid);
warnx(_("%s: swap format pagesize does not match."),
special);
rc = swap_reinitialize(special, label, uuid);
free(label);
free(uuid);
if (rc < 0)
goto err;
} else
warnx(_("%s: swap format pagesize does not match. "
"(Use --fixpgsz to reinitialize it.)"),
special);
}
} else if (sig == SIG_SWSUSPEND) {
/* We have to reinitialize swap with old (=useless) software suspend
* data. The problem is that if we don't do it, then we get data
* corruption the next time an attempt at unsuspending is made.
*/
warnx(_("%s: software suspend data detected. "
"Rewriting the swap signature."),
special);
if (swap_rewrite_signature(special, pagesize) < 0)
goto err;
}
free(hdr);
close(fd);
return 0;
err:
if (fd != -1)
close(fd);
free(hdr);
return -1;
}
static int do_swapon(const char *orig_special, int prio,
int fl_discard, int canonic)
{
int status;
const char *special = orig_special;
int flags = 0;
if (verbose)
printf(_("swapon %s\n"), orig_special);
if (!canonic) {
special = mnt_resolve_spec(orig_special, mntcache);
if (!special)
return cannot_find(orig_special);
}
if (swapon_checks(special))
return -1;
#ifdef SWAP_FLAG_PREFER
if (prio >= 0) {
if (prio > SWAP_FLAG_PRIO_MASK)
prio = SWAP_FLAG_PRIO_MASK;
flags = SWAP_FLAG_PREFER
| ((prio & SWAP_FLAG_PRIO_MASK)
<< SWAP_FLAG_PRIO_SHIFT);
}
#endif
/*
* Validate the discard flags passed and set them
* accordingly before calling sys_swapon.
*/
if (fl_discard && !(fl_discard & ~SWAP_FLAGS_DISCARD_VALID)) {
/*
* If we get here with both discard policy flags set,
* we just need to tell the kernel to enable discards
* and it will do correctly, just as we expect.
*/
if ((fl_discard & SWAP_FLAG_DISCARD_ONCE) &&
(fl_discard & SWAP_FLAG_DISCARD_PAGES))
flags |= SWAP_FLAG_DISCARD;
else
flags |= fl_discard;
}
status = swapon(special, flags);
if (status < 0)
warn(_("%s: swapon failed"), orig_special);
return status;
}
static int swapon_by_label(const char *label, int prio, int dsc)
{
const char *special = mnt_resolve_tag("LABEL", label, mntcache);
return special ? do_swapon(special, prio, dsc, CANONIC) :
cannot_find(label);
}
static int swapon_by_uuid(const char *uuid, int prio, int dsc)
{
const char *special = mnt_resolve_tag("UUID", uuid, mntcache);
return special ? do_swapon(special, prio, dsc, CANONIC) :
cannot_find(uuid);
}
static int swapon_all(void)
{
struct libmnt_table *tb = get_fstab();
struct libmnt_iter *itr;
struct libmnt_fs *fs;
int status = 0;
if (!tb)
err(EXIT_FAILURE, _("failed to parse %s"), mnt_get_fstab_path());
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
while (mnt_table_find_next_fs(tb, itr, match_swap, NULL, &fs) == 0) {
/* defaults */
int pri = priority, dsc = discard, nofail = ifexists;
char *p, *src, *dscarg;
if (mnt_fs_get_option(fs, "noauto", NULL, NULL) == 0)
continue;
if (mnt_fs_get_option(fs, "discard", &dscarg, NULL) == 0) {
dsc |= SWAP_FLAG_DISCARD;
if (dscarg) {
/* only single-time discards are wanted */
if (strcmp(dscarg, "once") == 0)
dsc |= SWAP_FLAG_DISCARD_ONCE;
/* do discard for every released swap page */
if (strcmp(dscarg, "pages") == 0)
dsc |= SWAP_FLAG_DISCARD_PAGES;
}
}
if (mnt_fs_get_option(fs, "nofail", NULL, NULL) == 0)
nofail = 1;
if (mnt_fs_get_option(fs, "pri", &p, NULL) == 0 && p)
pri = atoi(p);
src = mnt_resolve_spec(mnt_fs_get_source(fs), mntcache);
if (!src) {
if (!nofail)
status |= cannot_find(mnt_fs_get_source(fs));
continue;
}
if (!is_active_swap(src) &&
(!nofail || !access(src, R_OK)))
status |= do_swapon(src, pri, dsc, CANONIC);
}
mnt_free_iter(itr);
return status;
}
static void __attribute__ ((__noreturn__)) usage(FILE * out)
{
size_t i;
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] [<spec>]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -a, --all enable all swaps from /etc/fstab\n"
" -d, --discard[=<policy>] enable swap discards, if supported by device\n"
" -e, --ifexists silently skip devices that do not exist\n"
" -f, --fixpgsz reinitialize the swap space if necessary\n"
" -p, --priority <prio> specify the priority of the swap device\n"
" -s, --summary display summary about used swap devices (DEPRECATED)\n"
" --show[=<columns>] display summary in definable table\n"
" --noheadings don't print headings, use with --show\n"
" --raw use the raw output format, use with --show\n"
" --bytes display swap size in bytes in --show output\n"
" -v, --verbose verbose mode\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fputs(_("\nThe <spec> parameter:\n" \
" -L <label> synonym for LABEL=<label>\n"
" -U <uuid> synonym for UUID=<uuid>\n"
" LABEL=<label> specifies device by swap area label\n"
" UUID=<uuid> specifies device by swap area UUID\n"
" PARTLABEL=<label> specifies device by partition label\n"
" PARTUUID=<uuid> specifies device by partition UUID\n"
" <device> name of device to be used\n"
" <file> name of file to be used\n"), out);
fputs(_("\nAvailable discard policy types (for --discard):\n"
" once : only single-time area discards are issued. (swapon)\n"
" pages : discard freed pages before they are reused.\n"
" * if no policy is selected both discard types are enabled. (default)\n"), out);
fputs(_("\nAvailable columns (for --show):\n"), out);
for (i = 0; i < ARRAY_SIZE(infos); i++)
fprintf(out, " %4s %s\n", infos[i].name, _(infos[i].help));
fprintf(out, USAGE_MAN_TAIL("swapon(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char *argv[])
{
int status = 0, c;
int show = 0;
int bytes = 0;
size_t i;
enum {
SHOW_OPTION = CHAR_MAX + 1,
RAW_OPTION,
NOHEADINGS_OPTION,
BYTES_OPTION
};
static const struct option long_opts[] = {
{ "priority", 1, 0, 'p' },
{ "discard", 2, 0, 'd' },
{ "ifexists", 0, 0, 'e' },
{ "summary", 0, 0, 's' },
{ "fixpgsz", 0, 0, 'f' },
{ "all", 0, 0, 'a' },
{ "help", 0, 0, 'h' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
{ "show", 2, 0, SHOW_OPTION },
{ "noheadings", 0, 0, NOHEADINGS_OPTION },
{ "raw", 0, 0, RAW_OPTION },
{ "bytes", 0, 0, BYTES_OPTION },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
mnt_init_debug(0);
mntcache = mnt_new_cache();
while ((c = getopt_long(argc, argv, "ahd::efp:svVL:U:",
long_opts, NULL)) != -1) {
switch (c) {
case 'a': /* all */
++all;
break;
case 'h': /* help */
usage(stdout);
break;
case 'p': /* priority */
priority = strtos16_or_err(optarg,
_("failed to parse priority"));
break;
case 'L':
add_label(optarg);
break;
case 'U':
add_uuid(optarg);
break;
case 'd':
discard |= SWAP_FLAG_DISCARD;
if (optarg) {
if (*optarg == '=')
optarg++;
if (strcmp(optarg, "once") == 0)
discard |= SWAP_FLAG_DISCARD_ONCE;
else if (strcmp(optarg, "pages") == 0)
discard |= SWAP_FLAG_DISCARD_PAGES;
else
errx(EXIT_FAILURE, _("unsupported discard policy: %s"), optarg);
}
break;
case 'e': /* ifexists */
ifexists = 1;
break;
case 'f':
fixpgsz = 1;
break;
case 's': /* status report */
status = display_summary();
return status;
case 'v': /* be chatty */
++verbose;
break;
case SHOW_OPTION:
if (optarg) {
ncolumns = string_to_idarray(optarg,
columns,
ARRAY_SIZE(columns),
column_name_to_id);
if (ncolumns < 0)
return EXIT_FAILURE;
}
show = 1;
break;
case NOHEADINGS_OPTION:
no_headings = 1;
break;
case RAW_OPTION:
raw = 1;
break;
case BYTES_OPTION:
bytes = 1;
break;
case 'V': /* version */
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 0:
break;
case '?':
default:
usage(stderr);
}
}
argv += optind;
if (show || (!all && !numof_labels() && !numof_uuids() && *argv == NULL)) {
if (!ncolumns) {
/* default columns */
columns[ncolumns++] = COL_PATH;
columns[ncolumns++] = COL_TYPE;
columns[ncolumns++] = COL_SIZE;
columns[ncolumns++] = COL_USED;
columns[ncolumns++] = COL_PRIO;
}
status = show_table(bytes);
return status;
}
if (ifexists && !all)
usage(stderr);
if (all)
status |= swapon_all();
for (i = 0; i < numof_labels(); i++)
status |= swapon_by_label(get_label(i), priority, discard);
for (i = 0; i < numof_uuids(); i++)
status |= swapon_by_uuid(get_uuid(i), priority, discard);
while (*argv != NULL)
status |= do_swapon(*argv++, priority, discard, !CANONIC);
free_tables();
mnt_unref_cache(mntcache);
return status;
}