Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/Documentation/filesystems/cifs/TODO b/Documentation/filesystems/cifs/TODO
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+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