include/partx.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  */
   5 #ifndef UTIL_LINUX_PARTX_H
   6 #define UTIL_LINUX_PARTX_H
   7
   8 #include <sys/ioctl.h>
   9 #include <linux/blkpg.h>
  10 #include <stdint.h>
  11
  12 #ifndef BLKPG_ADD_PARTITION
  13 # define BLKPG_ADD_PARTITION    1
  14 #endif
  15
  16 #ifndef BLKPG_DEL_PARTITION
  17 # define BLKPG_DEL_PARTITION    2
  18 #endif
  19
  20 #ifndef BLKPG_RESIZE_PARTITION
  21 # define BLKPG_RESIZE_PARTITION 3               /* since Linux 3.6 */
  22 #endif
  23
  24
  25 #define INIT_BLKPG_PARTITION(_partno, _start, _size) {  \
  26                 .pno    = (_partno),                    \
  27                 .start  = (_start) << 9,                \
  28                 .length = (_size) << 9,                 \
  29                 .devname[0] = 0,                        \
  30                 .volname[0] = 0                         \
  31 }
  32
  33 #define INIT_BLKPG_ARG(_action, _part) {                \
  34                 .op      = (_action),                   \
  35                 .flags   = 0,                           \
  36                 .datalen = sizeof(*(_part)),            \
  37                 .data = (_part)                         \
  38 }
  39
  40
  41 static inline int partx_del_partition(int fd, unsigned int partno)
  42 {
  43         struct blkpg_partition p = INIT_BLKPG_PARTITION(partno, 0, 0);
  44         struct blkpg_ioctl_arg a = INIT_BLKPG_ARG(BLKPG_DEL_PARTITION, &p);
  45
  46         return ioctl(fd, BLKPG, &a);
  47 }
  48
  49 static inline int partx_add_partition(int fd, int partno,
  50                         uint64_t start, uint64_t size)
  51 {
  52         struct blkpg_partition p = INIT_BLKPG_PARTITION(partno, start, size);
  53         struct blkpg_ioctl_arg a = INIT_BLKPG_ARG(BLKPG_ADD_PARTITION, &p);
  54
  55         return ioctl(fd, BLKPG, &a);
  56 }
  57
  58 static inline int partx_resize_partition(int fd, int partno,
  59                         uint64_t start, uint64_t size)
  60 {
  61         struct blkpg_partition p = INIT_BLKPG_PARTITION(partno, start, size);
  62         struct blkpg_ioctl_arg a = INIT_BLKPG_ARG(BLKPG_RESIZE_PARTITION, &p);
  63
  64         return ioctl(fd, BLKPG, &a);
  65 }
  66
  67 #endif /*  UTIL_LINUX_PARTX_H */