Re: [PATCH 3/3] Btrfs: make raid6 rebuild retry more

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On Tue, Dec 05, 2017 at 07:09:25PM +0100, David Sterba wrote:
> On Tue, Dec 05, 2017 at 04:07:35PM +0800, Qu Wenruo wrote:
> > > @@ -2166,11 +2166,21 @@ int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
> > >  	}
> > >  
> > >  	/*
> > > -	 * reconstruct from the q stripe if they are
> > > -	 * asking for mirror 3
> > > +	 * Loop retry:
> > > +	 * for 'mirror == 2', reconstruct from all other stripes.
> > 
> > What about using macro to makes the reassemble method more human readable?
> 
> Yeah, that's definetelly needed and should be based on
> BTRFS_MAX_MIRRORS, not just hardcoded to 3.

OK.

In case of raid5/6, BTRFS_MAX_MIRRORS is an abused name, it's more a
raid1/10 concept, either BTRFS_RAID56_FULL_REBUILD or
BTRFS_RAID56_FULL_CHK is better to me, which one do you guys like?

Thanks,

-liubo
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