btrfs and lz4

[Chris83]

(3rd Sep, 2014 09:03 PM)CurlyMo Wrote:  With all respect, don't follow the advice of f1vefour! It can actually wreck the filesystem totally.

The problem is that the kernel you are using doesn't have support for the lz4 feature in BTRFS:

Code:

#define BTRFS_FEATURE_INCOMPAT_SUPP            \
    (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |        \
     BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |    \
     BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |        \
     BTRFS_FEATURE_INCOMPAT_BIG_METADATA |        \
     BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |        \
     BTRFS_FEATURE_INCOMPAT_RAID56 |        \
     BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |        \
     BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |    \
     BTRFS_FEATURE_INCOMPAT_COMPRESS_LZ4 |        \
     BTRFS_FEATURE_INCOMPAT_NO_HOLES)

The 10th feature in the list. You need to a patched kernel which linux Mint apparently doesn't provide.

I'm still backing up all my files via Samba before I try anything else (takes 24h total...).
How do I find out which Kernel has support for lz4 and which one doesn't?
Can I add compatibility myself or would I need to completely change the distribution (I read somewhere ArchLinux has LZ4 support)?
I'm using the 32bit kernel from here: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16.1-utopic/
Linux Mint itself is still at 3.13.x