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Btrfs Online Resizing, Ext3 Conversion, and More

Jan 21, 2008, 21:00 (0 Talkback[s])
(Other stories by Jere)

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"Chris Mason announced version 0.10 of his new Btrfs filesystem, listing the following new features, 'explicit back references, online resizing (including shrinking), in place conversion from Ext3 to Btrfs, data=ordered support, mount options to disable data COW and checksumming, and barrier support for sata and IDE drives.' He noted that the disk format in v0.10 has changed, and is not compatible with the v0.9 disk format. Regarding back reference support, Chris explained, 'the core of this release is explicit back references for all metadata blocks, data extents, and directory items. These are a crucial building block for future features such as online fsck and migration between devices. The back references are verified during deletes, and the extent back references are checked by the existing offline fsck tool...'"

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