On 07/26/2013 12:30 PM, Mark Fasheh wrote:
Hi, The following series of patches implements in btrfs an ioctl to do offline deduplication of file extents. To be clear, "offline" in this sense means that the file system is mounted and running, but the dedupe is not done during file writes, but after the fact when some userspace software initiates a dedupe.
I think that you might want to use the terms "inband" and "out of band" which seem to be used in the "de dup" storage space a bit more often. Offline definitely carries the wrong connotation :)
ric
The primary patch is loosely based off of one sent by Josef Bacik back in January, 2011. http://permalink.gmane.org/gmane.comp.file-systems.btrfs/8508 I've made significant updates and changes from the original. In particular the structure passed is more fleshed out, this series has a high degree of code sharing between itself and the clone code, and the locking has been updated.
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