Reflink based File/Directory Snapshots

This tool works only if the XFS filesystem is created with the reflink support. For example,

$ mkfs.xfs -b size=4096 -m reflink=1,crc=1 /dev/sdb

Install

curl -L https://github.com/kadalu/reflink-snapshot/releases/latest/download/reflink-snapshot-`uname -m | sed 's|aarch64|arm64|' | sed 's|x86_64|amd64|'` -o reflink-snapshot
install reflink-snapshot /usr/local/bin/

Create a File or Directory Snapshot.

reflink-snapshot create ROOT_DIR PATH@SNAPNAME

Example: File Snapshot

$ reflink-snapshot create /mnt/data photos/2021/my-awesome-photo.jpeg@s1
Snapshot created successfully!

Example: Directory Snapshot

$ reflink-snapshot create /mnt/data photos/2021@s1
Snapshot created successfully!

List Snapshots

reflink-snapshot list ROOT_DIR
reflink-snapshot list ROOT_DIR PATH

Example:

$ reflink-snapshot list /mnt/data
photos/2021@s1 (directory)
photos/2021/my-awesome-photo.jpeg@s1  (file)
$
$ reflink-snapshot list /mnt/data photos/2021/my-awesome-photo.jpeg
photos/2021/my-awesome-photo.jpeg@s1  (file)

Delete a Snapshot

reflink-snapshot delete ROOT_DIR PATH@SNAP_NAME

$ reflink-snapshot delete /mnt/data photos/2021/my-awesome-photo.jpeg@s1
Snapshot deleted successfully!

Rollback a Snapshot

reflink-snapshot rollback ROOT_DIR PATH@SNAP_NAME

$ reflink-snapshot rollback /mnt/data photos/2021/my-awesome-photo.jpeg@s1
Snapshot rollback successful!

Mount a Snapshot

reflink-snapshot mount ROOT_DIR PATH@SNAP_NAME MOUNTPOINT

Directory Snapshot

$ mkdir /mnt/photos_2021@s1
$ reflink-snapshot mount /mnt/data photos/2021@s1 /mnt/photos_2021@s1

File Snapshot

$ touch /mnt/2021_my-awesome-photo@s1.jpeg
$ reflink-snapshot mount /mnt/data photos/2021/my-awesome-photo.jpeg@s1 /mnt/2021_my-awesome-photo@s1.jpeg