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diff --git a/Documentation/filesystems/cifs/TODO b/Documentation/filesystems/cifs/TODO new file mode 100644 index 000000000..852499aed --- /dev/null +++ b/Documentation/filesystems/cifs/TODO @@ -0,0 +1,104 @@ +Version 2.11 September 13, 2017 + +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 SMB3.02) 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) Compounding (in progress) to reduce number of roundtrips, and also +better optimize open to reduce redundant opens (using 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) + +l) encrypted file support + +m) improved stats gathering, tools (perhaps integration with nfsometer?) + +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). + +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 |