Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 135 insertions, 0 deletions

diff --git a/Documentation/admin-guide/cifs/todo.rst b/Documentation/admin-guide/cifs/todo.rst
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+====
+TODO
+====
+
+Version 2.14 December 21, 2018
+
+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 SMB3.1.1) missing optional features:
+
+   - multichannel (partially integrated), integration of multichannel with RDMA
+   - directory leases (improved metadata caching). Currently only implemented for root dir
+   - 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 (fiemap and SEEK_HOLE are implemented
+   but additional features would be supportable by the protocol such
+   as FALLOC_FL_COLLAPSE_RANGE and FALLOC_FL_INSERT_RANGE)
+
+c) Directory entry caching relies on a 1 second timer, rather than
+   using Directory Leases, currently only the root file handle is cached longer
+   by leveraging Directory Leases
+
+d) quota support (needs minor kernel change since quota calls otherwise
+    won't make it to network filesystems or deviceless filesystems).
+
+e) Additional use cases can be optimized to use "compounding" (e.g.
+   open/query/close and open/setinfo/close) to reduce the number of
+   roundtrips to the server and improve performance. Various cases
+   (stat, statfs, create, unlink, mkdir, xattrs) already have been improved by
+   using compounding but more can be done. In addition we could
+   significantly reduce redundant opens by using deferred close (with
+   handle caching leases) and better using reference counters on file
+   handles.
+
+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 is now implemented in cifs.ko to allow
+   sending various SMB3 fsctls and query info and set info calls
+   directly from user space) Add tools to make setting various non-POSIX
+   metadata attributes easier from tools (e.g. extending what was done
+   in smb-info tool).
+
+l) encrypted file support (currently the attribute showing the file is
+   encrypted on the server is reported, but changing the attribute is not
+   supported).
+
+m) improved stats gathering tools (perhaps integration with nfsometer?)
+   to extend and make easier to use what is currently in /proc/fs/cifs/Stats
+
+n) Add support for claims based ACLs ("DAC")
+
+o) mount helper GUI (to simplify the various configuration options on mount)
+
+p) Expand support for witness protocol to allow for notification of share
+   move, and server network adapter changes. Currently only notifications by
+   the witness protocol for server move is supported by the Linux client.
+
+q) Allow mount.cifs to be more verbose in reporting errors with dialect
+   or unsupported feature errors. This would now be easier due to the
+   implementation of the new mount API.
+
+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) Additional testing of POSIX Extensions for SMB3.1.1
+
+w) Add support for additional strong encryption types, and additional spnego
+   authentication mechanisms (see MS-SMB2).  GCM-256 is now partially implemented.
+
+x) Finish support for SMB3.1.1 compression
+
+Known Bugs
+==========
+
+See https://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
+
+5) Continue to extend the smb3 "buildbot" which does automated xfstesting
+   against Windows, Samba and Azure currently - to add additional tests and
+   to allow the buildbot to execute the tests faster. The URL for the
+   buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com
+
+6) Address various coverity warnings (most are not bugs per-se, but
+   the more warnings are addressed, the easier it is to spot real
+   problems that static analyzers will point out in the future).