Re: TRIM Support?

[Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>]

hi

At Tue, 25 May 2010 19:16:50 +0100,
Gordan Bobic wrote:
> 
> Hi,
> 
> I notice that the pitch for NILFS is that it is particularly suitable 
> for flash based media. Does it have any sort of support for TRIM 
> command? If not, is there at least an equivalent of dumpfs that could be 
> used to get the list of free blocks that could be passed to hdparm to 
> issue TRIM commands to the SSD?

You may want to specify discard mount option for the purpose.
see Documentation/filesystems/nilfs2.txt

And if you want to see the usage of blocks, you can use combination of 
lssu and dumpseg to see which block numbers are in use.

thanks,

regards,

> TIA.
> 
> Gordan
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Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>
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