include/blkdev.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  *
   5  * Written by Karel Zak <kzak@redhat.com>
   6  */
   7 #ifndef BLKDEV_H
   8 #define BLKDEV_H
   9
  10 #include <sys/types.h>
  11 #include <sys/ioctl.h>
  12 #ifdef HAVE_SYS_IOCCOM_H
  13 # include <sys/ioccom.h> /* for _IO macro on e.g. Solaris */
  14 #endif
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <sys/stat.h>
  18
  19 #ifdef HAVE_SYS_MKDEV_H
  20 # include <sys/mkdev.h>         /* major and minor on Solaris */
  21 #endif
  22
  23 #define DEFAULT_SECTOR_SIZE       512
  24
  25 #ifdef __linux__
  26 /* very basic ioctls, should be available everywhere */
  27 # ifndef BLKROSET
  28 #  define BLKROSET   _IO(0x12,93)       /* set device read-only (0 = read-write) */
  29 #  define BLKROGET   _IO(0x12,94)       /* get read-only status (0 = read_write) */
  30 #  define BLKRRPART  _IO(0x12,95)       /* re-read partition table */
  31 #  define BLKGETSIZE _IO(0x12,96)       /* return device size /512 (long *arg) */
  32 #  define BLKFLSBUF  _IO(0x12,97)       /* flush buffer cache */
  33 #  define BLKRASET   _IO(0x12,98)       /* set read ahead for block device */
  34 #  define BLKRAGET   _IO(0x12,99)       /* get current read ahead setting */
  35 #  define BLKFRASET  _IO(0x12,100)      /* set filesystem (mm/filemap.c) read-ahead */
  36 #  define BLKFRAGET  _IO(0x12,101)      /* get filesystem (mm/filemap.c) read-ahead */
  37 #  define BLKSECTSET _IO(0x12,102)      /* set max sectors per request (ll_rw_blk.c) */
  38 #  define BLKSECTGET _IO(0x12,103)      /* get max sectors per request (ll_rw_blk.c) */
  39 #  define BLKSSZGET  _IO(0x12,104)      /* get block device sector size */
  40
  41 /* ioctls introduced in 2.2.16, removed in 2.5.58 */
  42 #  define BLKELVGET  _IOR(0x12,106,size_t) /* elevator get */
  43 #  define BLKELVSET  _IOW(0x12,107,size_t) /* elevator set */
  44
  45 #  define BLKBSZGET  _IOR(0x12,112,size_t)
  46 #  define BLKBSZSET  _IOW(0x12,113,size_t)
  47 # endif /* !BLKROSET */
  48
  49 # ifndef BLKGETSIZE64
  50 #  define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  51 # endif
  52
  53 /* block device topology ioctls, introduced in 2.6.32 (commit ac481c20) */
  54 # ifndef BLKIOMIN
  55 #  define BLKIOMIN   _IO(0x12,120)
  56 #  define BLKIOOPT   _IO(0x12,121)
  57 #  define BLKALIGNOFF _IO(0x12,122)
  58 #  define BLKPBSZGET _IO(0x12,123)
  59 # endif
  60
  61 /* discard zeroes support, introduced in 2.6.33 (commit 98262f27) */
  62 # ifndef BLKDISCARDZEROES
  63 #  define BLKDISCARDZEROES _IO(0x12,124)
  64 # endif
  65
  66 /* filesystem freeze, introduced in 2.6.29 (commit fcccf502) */
  67 # ifndef FIFREEZE
  68 #  define FIFREEZE   _IOWR('X', 119, int)    /* Freeze */
  69 #  define FITHAW     _IOWR('X', 120, int)    /* Thaw */
  70 # endif
  71
  72 /* uniform CD-ROM information */
  73 # ifndef CDROM_GET_CAPABILITY
  74 #  define CDROM_GET_CAPABILITY 0x5331
  75 # endif
  76
  77 #endif /* __linux */
  78
  79
  80 #ifdef APPLE_DARWIN
  81 # define BLKGETSIZE DKIOCGETBLOCKCOUNT32
  82 #endif
  83
  84 #ifndef HDIO_GETGEO
  85 # ifdef __linux__
  86 #  define HDIO_GETGEO 0x0301
  87 # endif
  88
  89 struct hd_geometry {
  90         unsigned char heads;
  91         unsigned char sectors;
  92         unsigned short cylinders;       /* truncated */
  93         unsigned long start;
  94 };
  95 #endif /* HDIO_GETGEO */
  96
  97
  98 /* are we working with block device? */
  99 int is_blkdev(int fd);
 100
 101 /* open block device or file */
 102 int open_blkdev_or_file(const struct stat *st, const char *name, const int oflag);
 103
 104 /* Determine size in bytes */
 105 off_t blkdev_find_size (int fd);
 106
 107 /* get size in bytes */
 108 int blkdev_get_size(int fd, unsigned long long *bytes);
 109
 110 /* get 512-byte sector count */
 111 int blkdev_get_sectors(int fd, unsigned long long *sectors);
 112
 113 /* get hardware sector size */
 114 int blkdev_get_sector_size(int fd, int *sector_size);
 115
 116 /* specifies whether or not the device is misaligned */
 117 int blkdev_is_misaligned(int fd);
 118
 119 /* get physical block device size */
 120 int blkdev_get_physector_size(int fd, int *sector_size);
 121
 122 /* is the device cdrom capable? */
 123 int blkdev_is_cdrom(int fd);
 124
 125 /* get device's geometry - legacy */
 126 int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s);
 127
 128 /* SCSI device types.  Copied almost as-is from kernel header.
 129  * http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/scsi/scsi.h */
 130 #define SCSI_TYPE_DISK                  0x00
 131 #define SCSI_TYPE_TAPE                  0x01
 132 #define SCSI_TYPE_PRINTER               0x02
 133 #define SCSI_TYPE_PROCESSOR             0x03    /* HP scanners use this */
 134 #define SCSI_TYPE_WORM                  0x04    /* Treated as ROM by our system */
 135 #define SCSI_TYPE_ROM                   0x05
 136 #define SCSI_TYPE_SCANNER               0x06
 137 #define SCSI_TYPE_MOD                   0x07    /* Magneto-optical disk - treated as SCSI_TYPE_DISK */
 138 #define SCSI_TYPE_MEDIUM_CHANGER        0x08
 139 #define SCSI_TYPE_COMM                  0x09    /* Communications device */
 140 #define SCSI_TYPE_RAID                  0x0c
 141 #define SCSI_TYPE_ENCLOSURE             0x0d    /* Enclosure Services Device */
 142 #define SCSI_TYPE_RBC                   0x0e
 143 #define SCSI_TYPE_OSD                   0x11
 144 #define SCSI_TYPE_NO_LUN                0x7f
 145
 146 /* convert scsi type code to name */
 147 const char *blkdev_scsi_type_to_name(int type);
 148
 149
 150 #endif /* BLKDEV_H */