Low level read api

[jojy.varghese]

Hi all
I am trying to create a file system in which the data gets loaded  
dynamically in the file when it is read. Now, the problem with this is that  
if i set the "st_size" of the "stat" for the file as 0, then OS wont read  
beyond 0 bytes the first time because fuse asks for the stat of the file  
first. So if I set the default size to something and plan to change it when  
the file gets populated, I get all "0"s after the real data. Is there a way  
around it?
The fuse low level API "fuse_reply_buf" says it will populate all "0"s upto  
the size. But when when I call the method  
as "fuse_reply_buf(request,NULL,0)", it still seems to fill the rest of the  
data with "0"s. Any ideas how to fix this?

Thanks in advance
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[Csaba Henk]

On 2009-10-06, jojy.varghese@... <jojy.varghese@...> wrote:

> Hi all
> I am trying to create a file system in which the data gets loaded  
> dynamically in the file when it is read. Now, the problem with this is that  
> if i set the "st_size" of the "stat" for the file as 0, then OS wont read  
> beyond 0 bytes the first time because fuse asks for the stat of the file  
> first. So if I set the default size to something and plan to change it when  
> the file gets populated, I get all "0"s after the real data. Is there a way  
> around it?
> The fuse low level API "fuse_reply_buf" says it will populate all "0"s upto  
> the size. But when when I call the method  
> as "fuse_reply_buf(request,NULL,0)", it still seems to fill the rest of the  
> data with "0"s. Any ideas how to fix this?

Maybe this:

http://sourceforge.net/apps/mediawiki/fuse/index.php?title=FAQ#I_can_not_know_the_file_size_in_advance.2C_how_do_I_force_EOF_from_fs_read.28.29_to_be_seen_in_the_application.3F

would be helpful to you?

Csaba


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