sd driver

The Linux 2.4 SCSI subsystem HOWTO
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# E.2. sd driver

## E.2.1. sd compile options

    MAX_RETRIES     {5}
    SD_TIMEOUT      {30 seconds}
    SD_MOD_TIMEOUT  {75 seconds}

## E.2.2. sd ioctls and user interface

The relevant files to see:

    include/linux/hdreg.h
    include/linux/genhd.h
    include/linux/fs.h

A list of ioctl()s follow:

    HDIO_GETGEO_BIG
    HDIO_GETGEO     [retrieve disk geometry]
    BLKGETSIZE      [number of sectors in device]
    BLKROSET        [set read only flag]
    BLKROGET        [get read only flag]
    BLKRASET        [set read ahead value]
    BLKRAGET        [get read ahead value]
    BLKFLSBUF       [instructs SCSI subsystem to flush buffers]
    BLKSSZGET       [get device block size]
    BLKPG		[partition table manipulation]
    BLKELVGET       [get elevator parameters]
    BLKELVSET       [set elevator parameters]
    BLKRRPART       [reread the partition table]

    open()    (all flags ignored)
    close()
    ioctl()   (see list above)

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