Re: howto preallocate to minimize fragmentation

[Ying-Hung Chen <ying@xxxxxxxxxxxxxx>]

> 
> Depends on if you truncate it before you re-write to it, I think.
> 
> But don't use dd - use xfs's preallocation calls, it will be MUCH more
> efficient.
> 

okay, I'll give it a try tomorrow,

just want to make sure,

int xfsctl (const char *path, int fd, int cmd, void *ptr);

path is actually the filename right? and fd is the FILE* where I open
the filename correct?

I'll be using XFS_IOC_RESVSP, and pass in xfs_flock64_t structure as the
final argument?

Thanks,

-Ying