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Date: Tue, 5 Mar 2024 03:04:09 -0800
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Subject: Re: /usr/bin/fallocate -v -d -l 2 myfile takes forever
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From: Mark Geisert via Cygwin <cygwin AT cygwin DOT com>
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On 3/5/2024 12:46 AM, Cedric Blancher via Cygwin wrote:
> On Mon, 29 Jan 2024 at 10:46, Mark Geisert via Cygwin <cygwin AT cygwin DOT com> wrote:
>>
>> On 1/28/2024 11:56 PM, Mark Geisert via Cygwin wrote:
>>> On 1/28/2024 10:44 PM, Cedric Blancher via Cygwin wrote:
>>>> Good morning!
>>>>
>>>> rm -f myfile
>>>> touch myfile
>>>> /usr/bin/fallocate -v -d -l myfile takes forever with latest Cygwin 3.5
>>>                                ^ length goes here, before filename
>>>
>>> I believe you need to
>>>       chattr +S myfile
>>> after the 'touch' to make the file sparsifiable.
>>>
>>> Also, I'm unsure if '-d' makes sense when initially allocating a sparse
>>> file.  If I leave it off, fallocate does the right thing.
>>>
>>> I'm separately investigating the 'takes forever' report.
>>
>> It's taking forever because it's in an infinite loop looking for data
>> followed by a hole, which is not present in a new file being created.
>> This is due to the '-d' option being specified.  fallocate ought to
>> diagnose this condition rather than looping forever, but here we are.
>>
>> It's possible we have an old fallocate from an old util-linux package.
>> I'll try to investigate this further when I have time.
>>
> 
> Any update on this issue?

Now that I've reviewed the whole email thread, I don't believe we ever 
received feedback from you on whether leaving off the '-d' option and 
doing the 'chattr +S' made any difference.

..mark


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