• Steve French's avatar
    smb3: enable swap on SMB3 mounts · 4e8aea30
    Steve French authored
    Add experimental support for allowing a swap file to be on an SMB3
    mount.  There are use cases where swapping over a secure network
    filesystem is preferable. In some cases there are no local
    block devices large enough, and network block devices can be
    hard to setup and secure.  And in some cases there are no
    local block devices at all (e.g. with the recent addition of
    remote boot over SMB3 mounts).
    
    There are various enhancements that can be added later e.g.:
    - doing a mandatory byte range lock over the swapfile (until
    the Linux VFS is modified to notify the file system that an open
    is for a swapfile, when the file can be opened "DENY_ALL" to prevent
    others from opening it).
    - pinning more buffers in the underlying transport to minimize memory
    allocations in the TCP stack under the fs
    - documenting how to create ACLs (on the server) to secure the
    swapfile (or adding additional tools to cifs-utils to make it easier)
    Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
    Acked-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
    Reviewed-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
    4e8aea30
cifsfs.c 45.7 KB