Linux device number bug report

[WEI Yongjun]

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 "glibc-kernheaders-2.4-8.34" uses structure dev_t and operates
the device number as 16-bit.
1. In file usr/include/linux/kdev_t.h : 110

    #define MAJOR(dev) ((dev)>>8)
    #define MINOR(dev) ((dev) & 0xff)
    #define MKDEV(ma,mi) ((ma)<<8 | (mi))


This operation(MKDEV) wants to combine major and minor to a device number.

In old definition, a device number is MMMMMMMMnnnnnnnn(M is major part and n
is minor part). This operation actually gets right device number.

But new device number is nnnnnnnnnnnnMMMMMMMMMMMMnnnnnnnn. So this operation
will lost high 12-bit minor number.


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.


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Wei Yongjun
Dept. of Technology and Development
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
No. 16-5, Guanzhou Rd., Nanjing, P.R.China
PHONE: +86+25-6630523-633
FUJITSU INTERNAL: 79955-651
FAX: +86+25-3317685
Mail: address@hidden
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