Re: New experimental btrfs branch ready for testing

Yan Zheng
2009-06-08T12:33:28Z

2009/6/2 Chris Mason <chris.mason@oracle.com>
>
> Hello everyone,
>
> Yan Zheng has been doing some major surgery to the back references an=
d
> extent allocation code, tackling bottlenecks in the code that tracks
> extents. =A0It scales better with many snapshots and performs better =
in
> the common case of no snapshots at all.
>
> THE NEW CODE IS A FORWARD ROLLING DISK FORMAT CHANGE. =A0This means i=
t is
> compatible with the current btrfs disk format, but once you mount a
> filesystem with the new code, it WILL NO LONGER BE MOUNTABLE FROM OLD
> KERNELS. =A0Old kernels spit out an error message when you try them o=
n new
> format filesystems.
>

Hello, everyone

I have a minor disk format change for the new format. The disk format c=
hange
makes snapshot dropping more efficient. The format change only affects =
=46S
has been balanced. If you are testing the new format, please don't use
btrfs-vol -b or btrfs-vol -r. If you have already used btrfs-vol -b or
btrfs-vol -r,
please backup your data.

Regards
Yan Zheng
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