libblkid-tiny/blkdev.h

   1 #ifndef BLKDEV_H
   2 #define BLKDEV_H
   3
   4 #include <sys/types.h>
   5 #include <sys/ioctl.h>
   6 #ifdef HAVE_SYS_IOCCOM_H
   7 # include <sys/ioccom.h> /* for _IO macro on e.g. Solaris */
   8 #endif
   9 #include <fcntl.h>
  10 #include <unistd.h>
  11
  12 #ifdef HAVE_SYS_MKDEV_H
  13 # include <sys/mkdev.h>         /* major and minor on Solaris */
  14 #endif
  15
  16 #define DEFAULT_SECTOR_SIZE       512
  17
  18 #ifdef __linux__
  19 /* very basic ioclts, should be available everywhere */
  20 # ifndef BLKROSET
  21 #  define BLKROSET   _IO(0x12,93)       /* set device read-only (0 = read-write) */
  22 #  define BLKROGET   _IO(0x12,94)       /* get read-only status (0 = read_write) */
  23 #  define BLKRRPART  _IO(0x12,95)       /* re-read partition table */
  24 #  define BLKGETSIZE _IO(0x12,96)       /* return device size /512 (long *arg) */
  25 #  define BLKFLSBUF  _IO(0x12,97)       /* flush buffer cache */
  26 #  define BLKRASET   _IO(0x12,98)       /* set read ahead for block device */
  27 #  define BLKRAGET   _IO(0x12,99)       /* get current read ahead setting */
  28 #  define BLKFRASET  _IO(0x12,100)      /* set filesystem (mm/filemap.c) read-ahead */
  29 #  define BLKFRAGET  _IO(0x12,101)      /* get filesystem (mm/filemap.c) read-ahead */
  30 #  define BLKSECTSET _IO(0x12,102)      /* set max sectors per request (ll_rw_blk.c) */
  31 #  define BLKSECTGET _IO(0x12,103)      /* get max sectors per request (ll_rw_blk.c) */
  32 #  define BLKSSZGET  _IO(0x12,104)      /* get block device sector size */
  33
  34 /* ioctls introduced in 2.2.16, removed in 2.5.58 */
  35 #  define BLKELVGET  _IOR(0x12,106,size_t) /* elevator get */
  36 #  define BLKELVSET  _IOW(0x12,107,size_t) /* elevator set */
  37
  38 #  define BLKBSZGET  _IOR(0x12,112,size_t)
  39 #  define BLKBSZSET  _IOW(0x12,113,size_t)
  40 # endif /* !BLKROSET */
  41
  42 # ifndef BLKGETSIZE64
  43 #  define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  44 # endif
  45
  46 /* block device topology ioctls, introduced in 2.6.32 (commit ac481c20) */
  47 # ifndef BLKIOMIN
  48 #  define BLKIOMIN   _IO(0x12,120)
  49 #  define BLKIOOPT   _IO(0x12,121)
  50 #  define BLKALIGNOFF _IO(0x12,122)
  51 #  define BLKPBSZGET _IO(0x12,123)
  52 # endif
  53
  54 /* discard zeroes support, introduced in 2.6.33 (commit 98262f27) */
  55 # ifndef BLKDISCARDZEROES
  56 #  define BLKDISCARDZEROES _IO(0x12,124)
  57 # endif
  58
  59 /* filesystem freeze, introduced in 2.6.29 (commit fcccf502) */
  60 # ifndef FIFREEZE
  61 #  define FIFREEZE   _IOWR('X', 119, int)    /* Freeze */
  62 #  define FITHAW     _IOWR('X', 120, int)    /* Thaw */
  63 # endif
  64
  65 #endif /* __linux */
  66
  67 #ifdef APPLE_DARWIN
  68 # define BLKGETSIZE DKIOCGETBLOCKCOUNT32
  69 #endif
  70
  71 #ifndef HDIO_GETGEO
  72 # ifdef __linux__
  73 #  define HDIO_GETGEO 0x0301
  74 # endif
  75
  76 /* uniform CD-ROM information */
  77 #ifndef CDROM_GET_CAPABILITY
  78 # define CDROM_GET_CAPABILITY 0x5331
  79 #endif
  80
  81 struct hd_geometry {
  82         unsigned char heads;
  83         unsigned char sectors;
  84         unsigned short cylinders;       /* truncated */
  85         unsigned long start;
  86 };
  87 #endif
  88
  89 /* are we working with block device? */
  90 int is_blkdev(int fd);
  91
  92 /* Determine size in bytes */
  93 off_t blkdev_find_size (int fd);
  94
  95 /* get size in bytes */
  96 int blkdev_get_size(int fd, unsigned long long *bytes);
  97
  98 /* get 512-byte sector count */
  99 int blkdev_get_sectors(int fd, unsigned long long *sectors);
 100
 101 /* get hardware sector size */
 102 int blkdev_get_sector_size(int fd, int *sector_size);
 103
 104 /* specifies whether or not the device is misaligned */
 105 int blkdev_is_misaligned(int fd);
 106
 107 /* get physical block device size */
 108 int blkdev_get_physector_size(int fd, int *sector_size);
 109
 110 /* is the device cdrom capable? */
 111 int blkdev_is_cdrom(int fd);
 112
 113 #endif /* BLKDEV_H */