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| author |   Steve French <stfrench@microsoft.com> | 2018-08-10 02:25:06 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-08-10 11:54:08 -0500 |
| commit | cdeaf9d04a5a0f51220d2f025385c553220bfb5c (patch) | |
| tree | 5527e70a8b44353df8ebc37a66628b288a9af9aa /fs/cifs/smb2pdu.h | |
| parent | cifs: don't show domain= in mount output when domain is empty (diff) | |
| download | linux-dev-cdeaf9d04a5a0f51220d2f025385c553220bfb5c.tar.xz linux-dev-cdeaf9d04a5a0f51220d2f025385c553220bfb5c.zip | |
smb3: allow previous versions to be mounted with snapshot= mount parm
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>
Diffstat (limited to 'fs/cifs/smb2pdu.h')
| -rw-r--r-- | fs/cifs/smb2pdu.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index cf37c2f3f3b8..a2eeae9e0432 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -767,6 +767,14 @@ struct create_durable_handle_reconnect_v2 { struct durable_reconnect_context_v2 dcontext; } __packed; +/* See MS-SMB2 2.2.13.2.5 */ +struct crt_twarp_ctxt { + struct create_context ccontext; + __u8 Name[8]; + __le64 Timestamp; + +} __packed; + #define COPY_CHUNK_RES_KEY_SIZE 24 struct resume_key_req { char ResumeKey[COPY_CHUNK_RES_KEY_SIZE]; |