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From: Chris Mason <clm@fb.com>
To: Mark Fasheh <mfasheh@suse.de>, <linux-btrfs@vger.kernel.org>
Cc: Josef Bacik <jbacik@fb.com>
Subject: Re: [PATCH] btrfs: clear 'ret' in btrfs_check_shared() loop
Date: Tue, 21 Apr 2015 20:49:08 -0400	[thread overview]
Message-ID: <5536F004.3090602@fb.com> (raw)
In-Reply-To: <20150421214733.GO17170@wotan.suse.de>

On 04/21/2015 05:47 PM, Mark Fasheh wrote:
> btrfs_check_shared() is leaking a return value of '1' from
> find_parent_nodes(). As a result, callers (in this case, extent_fiemap())
> are told extents are shared when they are not. This in turn broke fiemap on
> btrfs for kernels v3.18 and up.
> 
> The fix is simple - we just have to clear 'ret' after we are done processing
> the results of find_parent_nodes().
> 
> It wasn't clear to me at first what was happening with return values in
> btrfs_check_shared() and find_parent_nodes() - thanks to Josef for the help
> on irc. I added documentation to both functions to make things more clear
> for the next hacker who might come across them.
> 

Thanks Mark, any reason not to tag this for stable?

-chris


  reply	other threads:[~2015-04-22  0:49 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-21 21:47 [PATCH] btrfs: clear 'ret' in btrfs_check_shared() loop Mark Fasheh
2015-04-22  0:49 ` Chris Mason [this message]
2015-04-22  1:49   ` Mark Fasheh

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