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Simple single-file FUSE implementation of copy-on-write using sparse files as storage to copyup Example session: # mount | grep "on / " /dev/sda8 on / type reiserfs (rw,user_xattr,usrquota,acl) # touch mountpoint_file # ./fusecow /dev/sda8 mountpoint_file write_file # reiserfsck mountpoint_file Replaying journal: Trans replayed: mountid 636, transid 14679519, desc 901, len 2, commit 904, next trans offset 887 Trans replayed: mountid 636, transid 14679520, desc 905, len 1, commit 907, next trans offset 890 ... # ls -lh -rw------- 1 root disk 30G Jan 22 17:01 mountpoint_file -rwxr-xr-x 1 root root 29G Jan 23 06:01 write_file -rwxr-xr-x 1 root root 472K Jan 23 06:01 write_file.map # du -sh * 32M mountpoint_file 31M write_file 281K write_file.map # mkdir mnt && mount -o loop mountpoint_file mnt # dd if=/dev/urandom of=mnt/usr/local/etc/qqqqq bs=1M count=32 # umount mnt # fusermount -u mountpoint_file # du -sh * 0 mountpoint_file 65M write_file 289K write_file.map # ls /usr/local/etc/qqqqq ls: cannot access /usr/local/etc/qqqqq: No such file or directory # ./fusecow /dev/sda8 mountpoint_file write_file # mount -o loop mountpoint_file mnt # ls -lh mnt/usr/local/etc/qqqqq -rw-r--r-- 1 root root 32M Jan 23 06:05 mnt/usr/local/etc/qqqqq Limitations: 1. Slow 2. Cannot grow files yet 3. Unstable