Re: send/receive locking

[Hugo Mills <hugo@carfax.org.uk>]

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On Sat, Mar 08, 2014 at 09:55:50PM +0000, Josef Bacik wrote:
> Hey Hugo will you try the danger branch on btrfs-next, Wang changed the locking a bit.  Thanks,

   Sure. I'll build a kernel tonight and report tomorrow. I'm not sure
how repeatable the problem is, though. I'll see if I can quantify
that, too.

   Hugo.

> Josef
> 
> Hugo Mills <hugo@carfax.org.uk> wrote:
> 
> 
>    Is there anything that can be done about the issues of btrfs send
> blocking? I've been writing a backup script (slowly), and several
> times I've managed to hit a situation where large chunks of the
> machine grind to a complete halt in D state because the backup script
> has jammed up.
> 
>    Now, I'm aware that you can't send and receive to the same
> filesystem at the same time, and that's a restriction I can live with.
> However, having things that aren't related to the backup process
> suddenly stop working because the backup script is trying to log its
> progress to the same FS it's backing up is... umm... somewhat vexing,
> to say the least.
> 
>    Is this a truly fundamental property of send/receive, or is there
> likely to be a simple(ish) solution?
> 
>    Hugo.
> 

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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   --- Well, you don't get to be a kernel hacker simply by looking ---   
                    good in Speedos. -- Rusty Russell                    

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