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-Version 2.14 December 21, 2018
-
-A Partial List of Missing Features
-==================================
-
-Contributions are welcome. There are plenty of opportunities
-for visible, important contributions to this module. Here
-is a partial list of the known problems and missing features:
-
-a) SMB3 (and SMB3.1.1) missing optional features:
- - multichannel (started), integration with RDMA
- - directory leases (improved metadata caching), started (root dir only)
- - T10 copy offload ie "ODX" (copy chunk, and "Duplicate Extents" ioctl
- currently the only two server side copy mechanisms supported)
-
-b) improved sparse file support
-
-c) Directory entry caching relies on a 1 second timer, rather than
-using Directory Leases, currently only the root file handle is cached longer
-
-d) quota support (needs minor kernel change since quota calls
-to make it to network filesystems or deviceless filesystems)
-
-e) Additional use cases where we use "compoounding" (e.g. open/query/close
-and open/setinfo/close) to reduce the number of roundtrips, and also
-open to reduce redundant opens (using deferred close and reference counts more).
-
-f) Finish inotify support so kde and gnome file list windows
-will autorefresh (partially complete by Asser). Needs minor kernel
-vfs change to support removing D_NOTIFY on a file.
-
-g) Add GUI tool to configure /proc/fs/cifs settings and for display of
-the CIFS statistics (started)
-
-h) implement support for security and trusted categories of xattrs
-(requires minor protocol extension) to enable better support for SELINUX
-
-i) Add support for tree connect contexts (see MS-SMB2) a new SMB3.1.1 protocol
- feature (may be especially useful for virtualization).
-
-j) Create UID mapping facility so server UIDs can be mapped on a per
-mount or a per server basis to client UIDs or nobody if no mapping
-exists. Also better integration with winbind for resolving SID owners
-
-k) Add tools to take advantage of more smb3 specific ioctls and features
-(passthrough ioctl/fsctl for sending various SMB3 fsctls to the server
-is in progress, and a passthrough query_info call is already implemented
-in cifs.ko to allow smb3 info levels queries to be sent from userspace)
-
-l) encrypted file support
-
-m) improved stats gathering tools (perhaps integration with nfsometer?)
-to extend and make easier to use what is currently in /proc/fs/cifs/Stats
-
-n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
-file attribute via chflags) and improve user space tools for managing and
-viewing them.
-
-o) mount helper GUI (to simplify the various configuration options on mount)
-
-p) Add support for witness protocol (perhaps ioctl to cifs.ko from user space
- tool listening on witness protocol RPC) to allow for notification of share
- move, server failover, and server adapter changes. And also improve other
- failover scenarios, e.g. when client knows multiple DFS entries point to
- different servers, and the server we are connected to has gone down.
-
-q) Allow mount.cifs to be more verbose in reporting errors with dialect
-or unsupported feature errors.
-
-r) updating cifs documentation, and user guide.
-
-s) Addressing bugs found by running a broader set of xfstests in standard
-file system xfstest suite.
-
-t) split cifs and smb3 support into separate modules so legacy (and less
-secure) CIFS dialect can be disabled in environments that don't need it
-and simplify the code.
-
-v) POSIX Extensions for SMB3.1.1 (started, create and mkdir support added
-so far).
-
-w) Add support for additional strong encryption types, and additional spnego
-authentication mechanisms (see MS-SMB2)
-
-KNOWN BUGS
-====================================
-See http://bugzilla.samba.org - search on product "CifsVFS" for
-current bug list. Also check http://bugzilla.kernel.org (Product = File System, Component = CIFS)
-
-1) existing symbolic links (Windows reparse points) are recognized but
-can not be created remotely. They are implemented for Samba and those that
-support the CIFS Unix extensions, although earlier versions of Samba
-overly restrict the pathnames.
-2) follow_link and readdir code does not follow dfs junctions
-but recognizes them
-
-Misc testing to do
-==================
-1) check out max path names and max path name components against various server
-types. Try nested symlinks (8 deep). Return max path name in stat -f information
-
-2) Improve xfstest's cifs/smb3 enablement and adapt xfstests where needed to test
-cifs/smb3 better
-
-3) Additional performance testing and optimization using iozone and similar -
-there are some easy changes that can be done to parallelize sequential writes,
-and when signing is disabled to request larger read sizes (larger than
-negotiated size) and send larger write sizes to modern servers.
-
-4) More exhaustively test against less common servers
-
-5) Continue to extend the smb3 "buildbot" which does automated xfstesting
-against Windows, Samba and Azure currently - to add additional tests and
-to allow the buildbot to execute the tests faster. The URL for the
-buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com
-
-6) Address various coverity warnings (most are not bugs per-se, but
-the more warnings are addressed, the easier it is to spot real
-problems that static analyzers will point out in the future).