linux-ext4 - Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super

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Date:	Fri, 19 Nov 2010 16:44:33 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Mark Lord <kernel@...savvy.com>
cc:	"Ted Ts'o" <tytso@....edu>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Matthew Wilcox <matthew@....cx>,
	Josef Bacik <josef@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	sandeen@...hat.com
Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate
 super_operation

On Fri, 19 Nov 2010, Mark Lord wrote:

> On 10-11-19 09:02 AM, Ted Ts'o wrote:
> > but that's why mount -o discard is not the default.
> 
> 
> But, oddly, it _is_ the default for mke2fs -t ext4,
> which really threw me for a loop recently.
> 
> I though my system had locked up when suddenly everything
> went dead for a very long time (many minutes) while installing a new system.
> 
> Then I figured out what was going on.
> I really believe that "-K" should be the _default_ for mke2fs,
> as otherwise lots of other people probably also wonder
> if Linux is killing their SSD at system install time..
> 
> Cheers
> 

That is exactly a reason why I posted a patch for
"Make blkdev_issue_discard() interruptible", but nobody seems to care. As
an addition I have patched mke2fs to inform user about ongoing discard,
also with not much attention (Ted?).


Thanks!
-Lukas
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