Problem using aio functions and D

[Stef Bon]

Hello,

I'm writing a fuse fs, and I want it to make use of aio. Now it's
using normal blocking reads and writes,
and this leads to blocking behaviour.

Since I want my fs to play an important role for a "GoboLinux" like
setup, see for screenshots:

http://linux.bononline.nl/wiki/index.php/Changes_and_issues


Now using various implementations of aio (first libaio) and now posix
aio, I never have been able
to make it run.

To try it I now have a simple program using signalfd, epoll and aio.
It's attached.
This program works very good, at least when it's compiled like:


gcc -Wall -D_GNU_SOURCE -lrt testsignal.c -o testsignal


It's a advanced version of the test program found in the manpage of signalfd.

now test it:

./testsignal
mainloop: adding signalfd 4 to epoll
^CGot SIGINT: start the test aio read.


the progress in logfile:

Jan 28 11:58:08 clfs20091030 testsignal: aio_read_file
Jan 28 11:58:08 clfs20091030 testsignal: aio_read return: 0
Jan 28 11:58:08 clfs20091030 testsignal: mainloop aio read, no error,
nbytes: 14196767
Jan 28 11:58:08 clfs20091030 testsignal: aio_write_file
Jan 28 11:58:08 clfs20091030 testsignal: aio_write return: 0
Jan 28 11:58:08 clfs20091030 testsignal: mainloop aio write, no error,
nbytes: 14196767


This is as expected.

Now when I compile it using the -D_FILE_OFFSET_BITS=64


gcc -Wall -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -lrt testsignal.c -o testsignal


the log when Ctrl-C is pressed (and the aio read is strarted:)

Jan 28 11:50:27 clfs20091030 testsignal: aio_read_file
Jan 28 11:50:27 clfs20091030 testsignal: aio_read return: 0
Jan 28 11:50:27 clfs20091030 testsignal: unknown aio opcode 128


Someone an idea??

Thanks in advance. This is maybe the problem with making aio work with fuse.
Fuse must be compiled using the -D_FILE_... flag.

Stef
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