Linux device number bug report

[Shen Feng]

Hello,

I have some questions about device number extension.

In Linux kernel 2.6, device number will be extended from 16-bit to 32-bit. All utilities and libraries should make corresponding extension for this new feature in kernel 2.6.

I find that “grub-0.93-7” uses variables "major" and "minor" to represent two different parts of device number, but the device number is operated as 16-bit.

In file lib/device.c, the following macro is defined.

 

# ifndef MAJOR
#  ifndef MINORBITS
#   define MINORBITS    8
#  endif /* ! MINORBITS */
#  define MAJOR(dev)    ((unsigned int) ((dev) >> MINORBITS))
# endif /* ! MAJOR */

As following, "major" should be 12-bit, and "minor" should be 20-bit.
    mmmm mmmm mmmm MMMM MMMM MMMM mmmm mmmm
"M" means major device number.
"m" means minor device number.

But this major considers both "major" and "minor" as 8-bit. It seems not to correspond to device number extension.

Since I didn’t find any information about this aspect in homepage of this package, I wonder whether the latest version has completed the device number extension? If not, will it be completed in the future? And when?

Looking forward to answering.

Regards,
Shen Feng
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