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 #include <stdint.h>
  19
  20 #ifdef HAVE_SYS_MKDEV_H
  21 # include <sys/mkdev.h>         /* major and minor on Solaris */
  22 #endif
  23
  24 #define DEFAULT_SECTOR_SIZE       512
  25
  26 #ifdef __linux__
  27 /* very basic ioctls, should be available everywhere */
  28 # ifndef BLKROSET
  29 #  define BLKROSET   _IO(0x12,93)       /* set device read-only (0 = read-write) */
  30 #  define BLKROGET   _IO(0x12,94)       /* get read-only status (0 = read_write) */
  31 #  define BLKRRPART  _IO(0x12,95)       /* re-read partition table */
  32 #  define BLKGETSIZE _IO(0x12,96)       /* return device size /512 (long *arg) */
  33 #  define BLKFLSBUF  _IO(0x12,97)       /* flush buffer cache */
  34 #  define BLKRASET   _IO(0x12,98)       /* set read ahead for block device */
  35 #  define BLKRAGET   _IO(0x12,99)       /* get current read ahead setting */
  36 #  define BLKFRASET  _IO(0x12,100)      /* set filesystem (mm/filemap.c) read-ahead */
  37 #  define BLKFRAGET  _IO(0x12,101)      /* get filesystem (mm/filemap.c) read-ahead */
  38 #  define BLKSECTSET _IO(0x12,102)      /* set max sectors per request (ll_rw_blk.c) */
  39 #  define BLKSECTGET _IO(0x12,103)      /* get max sectors per request (ll_rw_blk.c) */
  40 #  define BLKSSZGET  _IO(0x12,104)      /* get block device sector size */
  41
  42 /* ioctls introduced in 2.2.16, removed in 2.5.58 */
  43 #  define BLKELVGET  _IOR(0x12,106,size_t) /* elevator get */
  44 #  define BLKELVSET  _IOW(0x12,107,size_t) /* elevator set */
  45
  46 #  define BLKBSZGET  _IOR(0x12,112,size_t)
  47 #  define BLKBSZSET  _IOW(0x12,113,size_t)
  48 # endif /* !BLKROSET */
  49
  50 # ifndef BLKGETSIZE64
  51 #  define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  52 # endif
  53
  54 /* block device topology ioctls, introduced in 2.6.32 (commit ac481c20) */
  55 # ifndef BLKIOMIN
  56 #  define BLKIOMIN   _IO(0x12,120)
  57 #  define BLKIOOPT   _IO(0x12,121)
  58 #  define BLKALIGNOFF _IO(0x12,122)
  59 #  define BLKPBSZGET _IO(0x12,123)
  60 # endif
  61
  62 /* discard zeroes support, introduced in 2.6.33 (commit 98262f27) */
  63 # ifndef BLKDISCARDZEROES
  64 #  define BLKDISCARDZEROES _IO(0x12,124)
  65 # endif
  66
  67 /* disk sequence number, introduced in 5.15 (commit 7957d93b) */
  68 # ifndef BLKGETDISKSEQ
  69 #  define BLKGETDISKSEQ _IOR(0x12, 128, uint64_t)
  70 # endif
  71
  72 /* filesystem freeze, introduced in 2.6.29 (commit fcccf502) */
  73 # ifndef FIFREEZE
  74 #  define FIFREEZE   _IOWR('X', 119, int)    /* Freeze */
  75 #  define FITHAW     _IOWR('X', 120, int)    /* Thaw */
  76 # endif
  77
  78 /* uniform CD-ROM information */
  79 # ifndef CDROM_GET_CAPABILITY
  80 #  define CDROM_GET_CAPABILITY 0x5331
  81 # endif
  82
  83 #endif /* __linux */
  84
  85
  86 #ifdef APPLE_DARWIN
  87 # define BLKGETSIZE DKIOCGETBLOCKCOUNT32
  88 #endif
  89
  90 #ifndef HDIO_GETGEO
  91 # ifdef __linux__
  92 #  define HDIO_GETGEO 0x0301
  93 # endif
  94
  95 struct hd_geometry {
  96         unsigned char heads;
  97         unsigned char sectors;
  98         unsigned short cylinders;       /* truncated */
  99         unsigned long start;
 100 };
 101 #endif /* HDIO_GETGEO */
 102
 103
 104 /* are we working with block device? */
 105 int is_blkdev(int fd);
 106
 107 /* open block device or file */
 108 int open_blkdev_or_file(const struct stat *st, const char *name, const int oflag);
 109
 110 /* Determine size in bytes */
 111 off_t blkdev_find_size (int fd);
 112
 113 /* get size in bytes */
 114 int blkdev_get_size(int fd, unsigned long long *bytes);
 115
 116 /* get 512-byte sector count */
 117 int blkdev_get_sectors(int fd, unsigned long long *sectors);
 118
 119 /* get hardware sector size */
 120 int blkdev_get_sector_size(int fd, int *sector_size);
 121
 122 /* specifies whether or not the device is misaligned */
 123 int blkdev_is_misaligned(int fd);
 124
 125 /* get physical block device size */
 126 int blkdev_get_physector_size(int fd, int *sector_size);
 127
 128 /* is the device cdrom capable? */
 129 int blkdev_is_cdrom(int fd);
 130
 131 /* get device's geometry - legacy */
 132 int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s);
 133
 134 /* SCSI device types.  Copied almost as-is from kernel header.
 135  * http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/scsi/scsi.h */
 136 #define SCSI_TYPE_DISK                  0x00
 137 #define SCSI_TYPE_TAPE                  0x01
 138 #define SCSI_TYPE_PRINTER               0x02
 139 #define SCSI_TYPE_PROCESSOR             0x03    /* HP scanners use this */
 140 #define SCSI_TYPE_WORM                  0x04    /* Treated as ROM by our system */
 141 #define SCSI_TYPE_ROM                   0x05
 142 #define SCSI_TYPE_SCANNER               0x06
 143 #define SCSI_TYPE_MOD                   0x07    /* Magneto-optical disk - treated as SCSI_TYPE_DISK */
 144 #define SCSI_TYPE_MEDIUM_CHANGER        0x08
 145 #define SCSI_TYPE_COMM                  0x09    /* Communications device */
 146 #define SCSI_TYPE_RAID                  0x0c
 147 #define SCSI_TYPE_ENCLOSURE             0x0d    /* Enclosure Services Device */
 148 #define SCSI_TYPE_RBC                   0x0e
 149 #define SCSI_TYPE_OSD                   0x11
 150 #define SCSI_TYPE_NO_LUN                0x7f
 151
 152 /* convert scsi type code to name */
 153 const char *blkdev_scsi_type_to_name(int type);
 154
 155 int blkdev_lock(int fd, const char *devname, const char *lockmode);
 156 #ifdef HAVE_LINUX_BLKZONED_H
 157 struct blk_zone_report *blkdev_get_zonereport(int fd, uint64_t sector, uint32_t nzones);
 158 #else
 159 static inline struct blk_zone_report *blkdev_get_zonereport(int fd, uint64_t sector, uint32_t nzones)
 160 {
 161         return NULL;
 162 }
 163 #endif
 164
 165 #endif /* BLKDEV_H */