linux-ext4 - Re: Potential bug in mballoc --- reusing data blocks before txn commit

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Date:	Mon, 29 Sep 2008 19:00:31 -0400
From:	Theodore Tso <tytso@....edu>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	Alex Tomas <bzzz@....com>, Andreas Dilger <adilger@....com>,
	linux-ext4@...r.kernel.org
Subject: Re: Potential bug in mballoc --- reusing data blocks before txn
	commit

On Mon, Sep 29, 2008 at 05:04:04PM -0400, Ric Wheeler wrote:
>
> I don't disagree with any of the above, just want to point out that TRIM  
> has a  SCSI T10 cousin that is very similar (used to implement thinly  
> provisioned luns). We should make sure as much as possible to make our  
> file system level support work for both...
>

That's shouldn't be a problem.  David Woodhouse created a standard
block device interface that should be suitable both for ATA and SCSI:

    int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
		         unsigned nr_sects, bio_end_io_t end_io);

							- Ted

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