LVM Compilation error on 2.6.13.2

[Kernel Enthusiast]

I ran into a problem building LVM on a new 2.6.13.2 kernel I built 
yesterday.   I built the kernel on an older Mandrake 8 system after 
updating to the latest gnu binutils.  It's very fast... much faster than 
my previous 2.4 kernel.  I have no complaints about performance.
I was able to build the kernel with the stock gcc-2.96. Disk access is 
much quieter than with previous kernels.

I'm not sure if this problem was due to a kernel customization error, but
I got the error "BLKBSZGET undefined (first use this function)" in
LVM2.2.0.14/lib/device/dev-io.c.  I added the following definition to the 
LVM code in order to enable LVM to compile:

#define BLKBSZGET _IO(0x12,104)

after the #INCLUDE statements in dev-io.c and then LVM 2.2.0.14 compiled 
without errors.

My question is this:   Was the above problem due to a non-standard kernel 
config file, i.e. a kernel lacking support for BLKBSZGET? Or is gcc-2.96 
too old, or a bad version?  This fix feels like a kludge and before I
configure LVM, I would like to make sure I didn't cause a problem for myself
by adding the above definition to the LVM source code.
I don't want to hard-code a definition in the LVM sources if the same
parameter is supposed to be defined in my environment elsewhere.

> From a theoretical standpoint, I am hoping it will not matter, but if anyone
on the list is familiar with BLKBSZGET and knows whether it is supposed to be
a kernel function, I would be delighted to hear your thoughts on the matter.
I'm not sure what effect hard-coding the definition of Block Size will have,
but if there is a standard way to define it, I would like to know about 
it.

Regards,

Glendon Gross


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