btrfs and lz4

[CurlyMo]

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.