Re: data loss in 2.6.9-rc1-mm1

[Tim Schmielau]

> $ uname -r
> 2.6.9-rc1-mm1
> 
> $ dd if=/dev/zero of=testfile bs=$((1024*1024)) count=10
> 10+0 records in
> 10+0 records out
> 10485760 bytes transferred in 0.028418 seconds (368981986 bytes/sec)
> 
> $ du -sb testfile
> 10485760        testfile
> 
> $ cat testfile > testfile.1
> 
> $ du -sb testfile.1
> 10481664        testfile.1


What does ls -l testfile.1 give?
What you describe actually can be correct behaviour, since the file is
all zeros.

Although yes, it seems highly improbable someone implemented an 
optimization that cuts away just one of 2560 pages.

Tim
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