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version 1.16 May 27, 2004
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) Support for SecurityDescriptors for chmod/chgrp/chown so
these can be supported for Windows servers
b) Better pam/winbind integration
c) multi-user mounts - multiplexed sessionsetups over single vc
(ie tcp session) - prettying up needed
d) Kerberos/SPNEGO session setup support - (started)
e) NTLMv2 authentication (mostly implemented)
f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup
used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM
and raw NTLMSSP already. This is important when enabling
extended security and mounting to Windows 2003 Servers
f) Directory entry caching relies on a 1 second timer, rather than
using FindNotify or equivalent. - (started)
g) A few byte range testcases fail due to POSIX vs. Windows/CIFS
style byte range lock differences
h) quota support
i) support for the Linux 2.5 kernel new feature get_xattr and set_xattr
which will allow us to expose dos attributes as well as real
ACLs. This support has been started in the current code, but is
ifdeffed out.
k) finish writepages support (multi-page write behind for improved
performance) and syncpage
l) hook lower into the sockets api (as NFS/SunRPC does) to avoid the
extra copy in/out of the socket buffers in some cases.
m) finish support for IPv6. This is mostly complete but
needs a simple inet_pton like function to convert ipv6
addresses in string representation.
o) 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).
p) Improve performance of readpages by sending more than one read
at a time when 8 pages or more are requested. Evaluate whether
reads larger than 16K would be helpful.
q) For support of Windows9x/98 we need to retry failed mounts
to *SMBSERVER (default server name) with the uppercase hostname
in the RFC1001 session_init request.
r) Add Extended Attributed support (for storing UID/GID info
to Windows servers)
s) Finish fcntl D_NOTIFY support so kde and gnome file list windows
will autorefresh
t) Add GUI tool to configure /proc/fs/cifs settings and for display of
the CIFS statistics
KNOWN BUGS (updated May 27, 2004)
====================================
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 but Samba has a bug currently handling
symlink text beginning with slash
2) follow_link and readdir code does not follow dfs junctions
but recognizes them
3) create of new files to FAT partitions on Windows servers can
succeed but still return access denied (appears to be Windows
server not cifs client problem) and has not been reproduced recently.
NTFS partitions do not have this problem.
4) debug connectathon lock test case 10 which fails against
Samba (may be unmappable due to POSIX to Windows lock model
differences but worth investigating). Also debug Samba to
see why lock test case 7 takes longer to complete to Samba
than to Windows.
Misc testing to do
==================
1) check out max path names and max path name components against various server
types. Try nested symlinks. Return max path name in stat -f information
2) Modify file portion of ltp so it can run against a mounted network
share and run it against cifs vfs.
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 the recently added NT4 support against various
NT4 service pack levels.
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