Re: [PATCH] Revert "Btrfs: allow superblock mismatch from older mkfs"

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On Thu, Mar 12, 2015 at 01:40:47PM +0800, Liu Bo wrote:
> This reverts commit 667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007.
> 
> This was used to make sure that a fresh btrfs from an older mkfs.btrfs,
> and it also allows us to mount a buggy btrfs if this btrfs has the right
> superblock head part but has something wrong with chunk tree part[1], and
> after that we can hit BUG_ON()s set in the code to prevent something
> impossible.
> 
> Since David has gave us "Btrfs progs v3.19-rc2", just remove the check,
> if anyone who wants to make a fresh btrfs, please use the latest one.

I think the fixed progs are out long enough and the combination of
really old progs + really new kernel is very uncommon and we don't need
to care about that anymore.

However, please do not do it as a revert, it's a normal patch although
it effectively reverts some other patch.
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