Re: [fuse-devel] Fake read sizes in FUSE (I want to get original user requests)

[Fox, K. M <kev...@pn...>]

In you open callback, try something like:
fi->direct_io = 1;

Kevin
________________________________________
From: Jun He [ju...@gm...]
Sent: Tuesday, December 04, 2012 11:11 AM
To: fus...@li...
Subject: [fuse-devel] Fake read sizes in FUSE (I want to get original user      requests)

Hi,
I am trying to capture read patterns from the user applications. But FUSE
always change the read sizes, mostly 4096. To clarify the problem, I use an
example here:

The user application:
    ...
    *pread(fd, 100, 7); // offset 100, size 7*
    ...

But I want to get original user requests(offset, size) in FUSE by something
like this:

*int xmp_read(...) {*
*    fprintf(stderr, "%lld, %lld\n", offset, size);*
*    ....*
*}*

It prints out:
100, 4096

How can I get the original user requests in FUSE? So it will print out
100, 7

I tried different combination of the FUSE options. Like:
*$./patfuse /mnt/fuse8 -sync_read -o kernel_cache -o max_readahead=0 -o
max_background=0 -d -o max_read=3=3 -o no_splice_read*
No luck.


Thanks,
Jun


--
Jun He
http://mypages.iit.edu/~jhe24/
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