From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: [RFC, PATCH 0/2] fiemap: filesystem free space mapping
Date: Tue, 23 Oct 2012 08:30:44 -0400 [thread overview]
Message-ID: <20121023123044.GG7341@infradead.org> (raw)
In-Reply-To: <1350537079-16246-1-git-send-email-david@fromorbit.com>
On Thu, Oct 18, 2012 at 04:11:17PM +1100, Dave Chinner wrote:
> So, I was bored a few days ago, and I was sick of having to run
> xfs_db incorrectly report free space extents when the filesytem is
> mounted, so I decided to extend fiemap to export freespace mappings
> to userspace so I could get the information coherently through the
> mounted filesystem.
>
> Yes, this could probably be considered interface abuse but, well, it
> was simple to do because extent mapping is exactly what fiemap is
> designed to do. Hence I didn't have to write new walkers/formatters
> and I was using code I knew worked correctly.
I think the right way to handle this is to introduce a new ioctl which
uses the same structures. That way we have a reasonable interface,
without issue like which file does it need to be called on because the
VFS glue can turn it into a superblock op.
next prev parent reply other threads:[~2012-10-23 12:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-18 5:11 [RFC, PATCH 0/2] fiemap: filesystem free space mapping Dave Chinner
2012-10-18 5:11 ` [PATCH 1/2] fiemap: add freespace mapping to FS_IOC_FIEMAP Dave Chinner
2012-11-08 16:50 ` Mark Tinguely
2012-11-08 20:56 ` Dave Chinner
2012-11-08 21:01 ` Mark Tinguely
2012-10-18 5:11 ` [PATCH 2/2] xfs: implement FIEMAP_FLAG_FREESPACE_* Dave Chinner
2012-10-18 5:27 ` [RFC, PATCH 3/2] xfsprogs: space management tool Dave Chinner
2012-10-18 8:10 ` [RFC, PATCH 0/2] fiemap: filesystem free space mapping Andreas Dilger
2012-10-18 21:07 ` Dave Chinner
2012-10-23 12:30 ` Christoph Hellwig [this message]
2012-10-23 21:53 ` Dave Chinner
2012-10-24 11:47 ` Chris Mason
2012-10-24 12:32 ` Jie Liu
2012-10-24 15:09 ` Christoph Hellwig
2012-10-24 19:15 ` Dave Chinner
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