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mounting with the "snapshots=" mount parm allows a read-only view of a previous version of a file system (see MS-SMB2 and "timewarp" tokens, section 2.2.13.2.6) based on the timestamp passed in on the snapshots mount parm. Add processing to optionally send this create context. Example output: /mnt1 is mounted with "snapshots=..." and will see an earlier version of the directory, with three fewer files than /mnt2 the current version of the directory. root@Ubuntu-17-Virtual-Machine:~/cifs-2.6# cat /proc/mounts | grep cifs //172.22.149.186/public /mnt1 cifs ro,relatime,vers=default,cache=strict,username=smfrench,uid=0,noforceuid,gid=0,noforcegid,addr=172.22.149.186,file_mode=0755,dir_mode=0755,soft,nounix,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,snapshot=131748608570000000,actimeo=1 //172.22.149.186/public /mnt2 cifs rw,relatime,vers=default,cache=strict,username=smfrench,uid=0,noforceuid,gid=0,noforcegid,addr=172.22.149.186,file_mode=0755,dir_mode=0755,soft,nounix,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1 root@Ubuntu-17-Virtual-Machine:~/cifs-2.6# ls /mnt1 EmptyDir newerdir root@Ubuntu-17-Virtual-Machine:~/cifs-2.6# ls /mnt1/newerdir root@Ubuntu-17-Virtual-Machine:~/cifs-2.6# ls /mnt2 EmptyDir file newerdir newestdir timestamp-trace.cap root@Ubuntu-17-Virtual-Machine:~/cifs-2.6# ls /mnt2/newerdir new-file-not-in-snapshot Snapshots are extremely useful for comparing previous versions of files or directories, and recovering from data corruptions or mistakes. Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>