Ulrich Drepper wrote:
> Christoph Hellwig wrote:
>> fallocate with the whence argument and flags is already quite complicated,
>> I'd rather have another call for placement decisions, that would
>> be called on an fd to do placement decissions for any further allocations
>> (prealloc, write, etc)
> 
> Yes, posix_fallocate shouldn't be made more complicated.  But I don't
> understand why requesting linear layout of the blocks should be an
> option.  It's always an advantage if the blocks requested this way are
> linear on disk.  So, the kernel should always do its best to make this
> happen, without needing an additional option.
> 

Agreed on both points.  The hints would be for things like start block,
or speculative EOF preallocation, not contiguity, which I think should
always be the goal.

-Eric
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