Btrfs In Linux 3.4 Kernel Has Big Changes
Written by Michael Larabel in Linux Kernel on 30 March 2012 at 07:55 PM EDT. 17 Comments
As the latest work queued up for merging in the Linux 3.4 kernel is the Btrfs file-system pull, which Chris Mason describes as "pretty big, picking up patches that have been under development for some time."

Among the Btrfs Linux 3.4 changes is the merging of error handling patches from SUSE, reworked mata-data with page cache interaction (performance improvements!), more aggressive page dropping for freed meta-data blocks, and support for meta-data bigger than the page size (meta-data blocks up to 64KB in size while 16KB / 32KB sizes seem to work the best). There's also other fixes and updates, including to the Btrfs balancing and defragging code.

The SUSE patches have already been part of the SUSE Linux Enterprise Server kernel and make it possible to abort transactions and to go in a read-only mode upon hitting errors.

Unfortunately, the LZ4 compression and Snappy compression support for greater transparent file-system compression don't appear to be part of this 3.4 merge (though LZO/Zlib compression for Btrfs remains a mount option). Chris Mason also mentions the Btrfs RAID5/RAID6 support is on the table for the Linux 3.5 kernel.

Find out more information on Btrfs in the Linux 3.4 kernel via Mason's pull request.
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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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