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Btrfs ("B-tree FS," pronounced "Butter F S"^[1]) is a GPL-licensed copy-on-write file system for Linux announced by Oracle in 2007.^[2]

Btrfs is intended to address the lack of a file system in Linux with pooling, snapshots, checksums and integral multi-device spanning—features crucial as the use of Linux scales upward into larger storage configurations common in the enterprise.^[3] It is expected to offer a feature set comparable to that of Sun's ZFS.^[4] Chris Mason, the principal author of the filesystem, has stated its goal was "to let Linux scale for the storage that will be available. Scaling is not just about addressing the storage but also means being able to administer and to manage it with a clean interface that lets people see what's being used and makes it more reliable."^[5]

Oracle has also begun work on CRFS (Coherent Remote File System), a network filesystem protocol intended to leverage the Btrfs architecture to gain higher performance than existing protocols (such as NFS and CIFS) and to expose Btrfs features such as snapshots to remote clients.^[6]

Btrfs 1.0 (with finalized on-disk format) was originally slated for a late 2008 release,^[7] but as of August 2009^[update] is still not yet ready for production use. It has, however, been accepted into the mainline kernel for testing as of 2.6.29rc1.^[8]

The principal developer of the ext3 and ext4 file systems, Theodore Ts'o, has stated that ext4 is simply a stop-gap and that Btrfs is the way forward,^[9] having "a number of the same design ideas that reiser3/4 had".^[10]

Btrfs (B-tree FS or "Butter FS"^[1][2]) is a copy-on-write file system for Linux announced by Oracle in 2007 and published under the GNU General Public License (GPL).^[3] It originated as a response to the ZFS filesystem and is expected to be free of many of the limitations that other Linux filesystems currently have.^{[citation needed]}

Btrfs is under heavy development and the current release is only intended for testing. Btrfs v0.18 was released January 2009.^[4] Plans existed for releasing Btrfs v1.0 (with finalized on-disk format) in late 2008,^[5] however this date has since passed and a new timeline for final release has not yet emerged as of April 2009^[update].

go to Packt Publishing's Open Source CMS Award Web site before October 30 and cast your vote in the following categories:



• Hall of Fame
• Best Open Source PHP CMS

Use an indent of 2 spaces, with no tabs.

Lines should have no trailing whitespace at the end.

Files should be formatted with \n as the line ending (Unix line endings), not \r\n (Windows line endings).

Create forms that submit a search to an external search engine, like Google, Yahoo!, Wikipedia, Last.fm or any other engine that uses query strings for form submissions (GET). External Search comes with predefined settings for a lot of common search engines in the following categories:



• Dictionaries and encyclopediae
• General Search sites
• Media
• Programming



If you would like a form for a search engine that isn't predefined, you can enter its settings at the External Search administration page.

Opera Unite: a Web server in the Web browser

With Opera 10, we are introducing a new technology called Opera Unite, radically extending what you are able to do online. Opera Unite harnesses the power of today's fast connections and hardware, allowing all of us to help define the future landscape of the Web, one computer at a time. Read about how Opera Unite is going to change the way we interact on the Web on labs.opera.com.

Opera Unite is, as of this writing, available for download and testing in an alpha version. The company's information about its functionality and usability is very interesting reading.

Some examples from the project's dedicated web site shows that functionality like the following will be available:

• Host your Web sites running from your own computer.
• Share your personal photos with friends around the world without the need to upload them.
• A fun place for people to leave notes on your computer.
• A simple and safe way to share files directly from your computer.
• Opera Unite services can be accessed from any modern browser, including mobile browsers