From: Al Viro <viro@ZenIV.linux.org.uk>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] procfs: stop using vmtruncate
Date: Tue, 21 Jun 2011 03:05:26 +0100 [thread overview]
Message-ID: <20110621020526.GY11521@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20110620224727.GA22187@infradead.org>
On Mon, Jun 20, 2011 at 06:47:27PM -0400, Christoph Hellwig wrote:
> Procfs doens't have any ->truncate instances, so all vmtruncate calls can
> be replaced with truncate_setsize, given that we've just done the
> inode_newsize_ok check as part of inode_change_ok just before.
What files on procfs allow meaningful truncate anyway? I agree that
vmtruncate() there is bogus, but AFAICT we have the following picture:
* there are files with non-zero i_size (/proc/kcore and
/proc/bus/pci/*/*); for any of those ATTR_SIZE should fail and I don't
think it should fail silently.
* the rest has size 0 and for those ATTR_SIZE to non-0 length
should definitely fail with an error.
next prev parent reply other threads:[~2011-06-21 2:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 22:47 [PATCH] procfs: stop using vmtruncate Christoph Hellwig
2011-06-21 2:05 ` Al Viro [this message]
2011-06-21 7:43 ` Christoph Hellwig
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