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diff --git a/Documentation/filesystems/cifs/TODO b/Documentation/filesystems/cifs/TODO new file mode 100644 index 000000000..066ffddc3 --- /dev/null +++ b/Documentation/filesystems/cifs/TODO @@ -0,0 +1,104 @@ +Version 2.03 August 1, 2014 + +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: + - RDMA + - multichannel (started) + - directory leases (improved metadata caching) + - T10 copy offload (copy chunk is only mechanism supported) + - encrypted shares + +b) improved sparse file support + +c) Directory entry caching relies on a 1 second timer, rather than +using FindNotify or equivalent. - (started) + +d) quota support (needs minor kernel change since quota calls +to make it to network filesystems or deviceless filesystems) + +e) improve support for very old servers (OS/2 and Win9x for example) +Including support for changing the time remotely (utimes command). + +f) hook lower into the sockets api (as NFS/SunRPC does) to avoid the +extra copy in/out of the socket buffers in some cases. + +g) Better optimize open (and pathbased setfilesize) to reduce the +oplock breaks coming from windows srv. Piggyback identical file +opens on top of each other by incrementing reference count rather +than resending (helps reduce server resource utilization and avoid +spurious oplock breaks). + +h) Add support for storing symlink info to Windows servers +in the Extended Attribute format their SFU clients would recognize. + +i) 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. + +j) Add GUI tool to configure /proc/fs/cifs settings and for display of +the CIFS statistics (started) + +k) implement support for security and trusted categories of xattrs +(requires minor protocol extension) to enable better support for SELINUX + +l) Implement O_DIRECT flag on open (already supported on mount) + +m) 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. This is helpful when Unix extensions are negotiated to +allow better permission checking when UIDs differ on the server +and client. Add new protocol request to the CIFS protocol +standard for asking the server for the corresponding name of a +particular uid. + +n) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too) + +o) mount check for unmatched uids + +p) Add support for new vfs entry point for fallocate + +q) Add tools to take advantage of cifs/smb3 specific ioctls and features +such as "CopyChunk" (fast server side file copy) + +r) encrypted file support + +s) improved stats gathering, tools (perhaps integration with nfsometer?) + +t) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed +file attribute via chflags) + +u) mount helper GUI (to simplify the various configuration options on mount) + + +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 enablement and adapt xfstests where needed to test +cifs 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 |