105 lines
4.3 KiB
Plaintext
105 lines
4.3 KiB
Plaintext
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Version 2.11 September 13, 2017
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A Partial List of Missing Features
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==================================
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Contributions are welcome. There are plenty of opportunities
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for visible, important contributions to this module. Here
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is a partial list of the known problems and missing features:
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a) SMB3 (and SMB3.02) missing optional features:
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- multichannel (started), integration with RDMA
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- directory leases (improved metadata caching), started (root dir only)
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- T10 copy offload ie "ODX" (copy chunk, and "Duplicate Extents" ioctl
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currently the only two server side copy mechanisms supported)
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b) improved sparse file support
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c) Directory entry caching relies on a 1 second timer, rather than
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using Directory Leases, currently only the root file handle is cached longer
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d) quota support (needs minor kernel change since quota calls
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to make it to network filesystems or deviceless filesystems)
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e) Compounding (in progress) to reduce number of roundtrips, and also
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better optimize open to reduce redundant opens (using reference counts more).
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f) Finish inotify support so kde and gnome file list windows
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will autorefresh (partially complete by Asser). Needs minor kernel
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vfs change to support removing D_NOTIFY on a file.
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g) Add GUI tool to configure /proc/fs/cifs settings and for display of
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the CIFS statistics (started)
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h) implement support for security and trusted categories of xattrs
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(requires minor protocol extension) to enable better support for SELINUX
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i) Add support for tree connect contexts (see MS-SMB2) a new SMB3.1.1 protocol
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feature (may be especially useful for virtualization).
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j) Create UID mapping facility so server UIDs can be mapped on a per
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mount or a per server basis to client UIDs or nobody if no mapping
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exists. Also better integration with winbind for resolving SID owners
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k) Add tools to take advantage of more smb3 specific ioctls and features
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(passthrough ioctl/fsctl for sending various SMB3 fsctls to the server
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is in progress)
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l) encrypted file support
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m) improved stats gathering, tools (perhaps integration with nfsometer?)
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n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
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file attribute via chflags) and improve user space tools for managing and
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viewing them.
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o) mount helper GUI (to simplify the various configuration options on mount)
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p) Add support for witness protocol (perhaps ioctl to cifs.ko from user space
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tool listening on witness protocol RPC) to allow for notification of share
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move, server failover, and server adapter changes. And also improve other
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failover scenarios, e.g. when client knows multiple DFS entries point to
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different servers, and the server we are connected to has gone down.
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q) Allow mount.cifs to be more verbose in reporting errors with dialect
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or unsupported feature errors.
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r) updating cifs documentation, and user guide.
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s) Addressing bugs found by running a broader set of xfstests in standard
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file system xfstest suite.
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t) split cifs and smb3 support into separate modules so legacy (and less
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secure) CIFS dialect can be disabled in environments that don't need it
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and simplify the code.
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v) POSIX Extensions for SMB3.1.1 (started, create and mkdir support added
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so far).
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KNOWN BUGS
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====================================
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See http://bugzilla.samba.org - search on product "CifsVFS" for
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current bug list. Also check http://bugzilla.kernel.org (Product = File System, Component = CIFS)
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1) existing symbolic links (Windows reparse points) are recognized but
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can not be created remotely. They are implemented for Samba and those that
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support the CIFS Unix extensions, although earlier versions of Samba
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overly restrict the pathnames.
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2) follow_link and readdir code does not follow dfs junctions
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but recognizes them
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Misc testing to do
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==================
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1) check out max path names and max path name components against various server
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types. Try nested symlinks (8 deep). Return max path name in stat -f information
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2) Improve xfstest's cifs/smb3 enablement and adapt xfstests where needed to test
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cifs/smb3 better
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3) Additional performance testing and optimization using iozone and similar -
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there are some easy changes that can be done to parallelize sequential writes,
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and when signing is disabled to request larger read sizes (larger than
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negotiated size) and send larger write sizes to modern servers.
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4) More exhaustively test against less common servers
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