mremap, file that need grow on demand, and fast file access

[ElFran sent by Nabble.com]

Hello,
Seems that mmap is better that i/o to access a file.

But my problem is this:
I need fast file access (on memory for read only) and write a file to the disk seecure.
A good choice seems to be mmap, msync, mremap, etc. But,...
msync (put in disk) and mremap do not work for me (for grow on demand), cannot allocate memory.
The size of maped file is 500 bytes.

Anyone known how to solve this problem?
glibc-2.3.4-2
gcc-3.4.3-9
kernel 2.6.12.4

Thanks in advance.
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