I have a Btrfs partition that is reliably reproducing premature ENOSPC when restoring the disk from a tar file, but it is only happening with zlib compression (lzo or no compression proceeds normally). I've had the same issue at least back through the 3.1 kernel series, and I've been having intermittent issues even further back. I am currently using a 3.2.1 kernel merged with Chris' latest integration branch. I've performed about 12 trials trying to explore various combinations of compress, compress-force, compress[-force]=[zlib,lzo] and autodefrag. If I use no compression, or if I explicitly declare lzo compression, I don't receive the premature ENOSPC when untarring my restoration archive to the empty partition. If I don't specify compression (zlib is the default) or specify zlib, I get consistent premature ENOSPC errors regardless of other combinations. I apologize if this is already general knowledge, but I couldn't see where this has been posted to the list before. As time allows, I will try to capture exactly where this ENOSPC is being issued in btrfs by inserting WARN_ON's in my local version where-ever ENOSPC is set. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
