Question on xfstest 274

[WuBo]

On 01/28/2012 04:51 AM, Eric Sandeen wrote:
> Hi, I was wondering if you could describe your intent for 274 just a little more.
> 
> The test says:
> 
> # preallocation test
> 
> but that is the only comment other than copyright.  ;)

Maybe the comment is too simple :)

> 
> I see that it does:
> 
> # Make a 1G fs
> # Create a single 4k file
> # Allocate 1M past the EOF on that file
> # Completely fill remaining space, using 2 other files
> # Write 8k past EOF on the original file which has blocks past EOF
> 
> but I am not certain what you are testing.  I presume that
> you are testing the fact that the 1M past EOF should be truncated,
> freeing up space, and allowing the 8k write to succeed?
> Is that right?

Actually I write 8K at the end of 4K(seek=1), and what I want to test
is the 8K-write should be succeed because the preallocation 1M. At the
mean while, the file should not be truncated.

Thanks,
wubo

> 
> However, at least on ext4 I noticed that the "fill the fs"
> stage does not succeed; perhaps that should be tested as well.
> 
> I can do some similar work on this like I did for 275, but I need
> to be sure I understand your original intent for the test, first.
> 
> Thanks,
> -Eric
>