Re: [fuse-devel] two upcalls for one OPEN - O_TRUNC

[Corin <wak...@gm...>]

On 23.03.2009 08:24, Werner Baumann wrote:
> Hello,
>
> when an application issues an open request with flag O_TRUNC set, davfs2 
> gets two separate upcalls from fuse:
> - FUSE_SETATTR to truncate the file to length zero
> - FUSE_OPEN to open the file for writing
I'm not a real fuse expert but at least fuse 2.8.0-rc has an option 
"FUSE_CAP_ATOMIC_O_TRUNC" which you can pass back to fuse in the struct 
fuse_conn_info->want in fuse_init callback. I guess it tells fuse that 
your open implementation can handle O_TRUNC and so does only one call to 
open with this flag set.

Corin