Fixed MTP to work with TWRP

Documentation/filesystems/cifs/TODO

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+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