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Re: [PATCH] maint: avoid reading lots of data from /dev/urandom
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From: |
Bernhard Voelker |
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Subject: |
Re: [PATCH] maint: avoid reading lots of data from /dev/urandom |
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Date: |
Tue, 24 Apr 2012 13:53:35 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120328 Thunderbird/11.0.1 |
On 04/24/2012 01:15 PM, Pádraig Brady wrote:
>> With those changes, the affected files are then very compressible.
>> > With some file system types/options, won't they occupy far fewer
>> > blocks than before?
> Good point.
> The dd/sparse one could then fail the alloc check.
> The fiemap-empty change is only 5120 bytes too.
Wouldn't
-dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unwritten.withdata
+dd count=10 if=/dev/zero | sed 's/\(.\)./\1 /g' | dd conv=notrunc
of=unwritten.withdata
defeat the compression logic?
Have a nice day,
Berny