Re: [PATCH v5 9/9] btrfs: btrfs_copy_file_range() only supports reflinks

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On Fri, Oct 16, 2015 at 07:49:19AM -0400, Chris Mason wrote:
> > Yes, that would be my preference.  I'd also like to understand what
> > exactly btrfs does in fallocate.
> 
> For which part?  The answer changes based on how many references there
> are to a given fallocated region.

Both cases.  With btrfs allocating new block on every write how do you
avoid that ENOSPC?  Is there a unassigned block preallocation that's
made persistent in some way?
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