src/shared/dm-util.c

   1 #include <fcntl.h>
   2 #include <linux/dm-ioctl.h>
   3 #include <sys/ioctl.h>
   4
   5 #include "dm-util.h"
   6 #include "fd-util.h"
   7 #include "string-util.h"
   8
   9 int dm_deferred_remove(const char *name) {
  10
  11         struct dm_ioctl dm = {
  12                 .version = {
  13                         DM_VERSION_MAJOR,
  14                         DM_VERSION_MINOR,
  15                         DM_VERSION_PATCHLEVEL
  16                 },
  17                 .data_size = sizeof(dm),
  18                 .flags = DM_DEFERRED_REMOVE,
  19         };
  20
  21         _cleanup_close_ int fd = -1;
  22
  23         assert(name);
  24
  25         /* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl()
  26          * directly. */
  27
  28         if (strlen(name) >= sizeof(dm.name))
  29                 return -ENODEV; /* A device with a name longer than this cannot possibly exist */
  30
  31         fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
  32         if (fd < 0)
  33                 return -errno;
  34
  35         strncpy_exact(dm.name, name, sizeof(dm.name));
  36
  37         if (ioctl(fd, DM_DEV_REMOVE, &dm))
  38                 return -errno;
  39
  40         return 0;
  41 }