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util-linux/sys-utils/swapon-common.c

107 lines
1.7 KiB

#include "c.h"
#include "nls.h"
#include "xalloc.h"
#include "swapon-common.h"
/*
* content of /proc/swaps and /etc/fstab
*/
static struct libmnt_table *swaps, *fstab;
struct libmnt_cache *mntcache;
struct libmnt_table *get_fstab(void)
{
if (!fstab) {
fstab = mnt_new_table();
if (!fstab)
return NULL;
mnt_table_set_cache(fstab, mntcache);
if (mnt_table_parse_fstab(fstab, NULL) != 0)
return NULL;
}
return fstab;
}
struct libmnt_table *get_swaps(void)
{
if (!swaps) {
swaps = mnt_new_table();
if (!swaps)
return NULL;
mnt_table_set_cache(swaps, mntcache);
if (mnt_table_parse_swaps(swaps, NULL) != 0)
return NULL;
}
return swaps;
}
void free_tables(void)
{
mnt_unref_table(swaps);
mnt_unref_table(fstab);
}
int match_swap(struct libmnt_fs *fs, void *data __attribute__((unused)))
{
return fs && mnt_fs_is_swaparea(fs);
}
int is_active_swap(const char *filename)
{
struct libmnt_table *st = get_swaps();
return st && mnt_table_find_source(st, filename, MNT_ITER_BACKWARD);
}
int cannot_find(const char *special)
{
warnx(_("cannot find the device for %s"), special);
return -1;
}
/*
* Lists with -L and -U option
*/
static const char **llist;
static size_t llct;
static const char **ulist;
static size_t ulct;
void add_label(const char *label)
{
llist = (const char **) xrealloc(llist, (++llct) * sizeof(char *));
llist[llct - 1] = label;
}
const char *get_label(size_t i)
{
return i < llct ? llist[i] : NULL;
}
size_t numof_labels(void)
{
return llct;
}
void add_uuid(const char *uuid)
{
ulist = (const char **) xrealloc(ulist, (++ulct) * sizeof(char *));
ulist[ulct - 1] = uuid;
}
const char *get_uuid(size_t i)
{
return i < ulct ? ulist[i] : NULL;
}
size_t numof_uuids(void)
{
return ulct;
}