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1da177e4 LT |
1 | version 1.22 July 30, 2004 |
2 | ||
3 | A Partial List of Missing Features | |
4 | ================================== | |
5 | ||
6 | Contributions are welcome. There are plenty of opportunities | |
7 | for visible, important contributions to this module. Here | |
8 | is a partial list of the known problems and missing features: | |
9 | ||
10 | a) Support for SecurityDescriptors for chmod/chgrp/chown so | |
11 | these can be supported for Windows servers | |
12 | ||
13 | b) Better pam/winbind integration (e.g. to handle uid mapping | |
14 | better) | |
15 | ||
16 | c) multi-user mounts - multiplexed sessionsetups over single vc | |
17 | (ie tcp session) - prettying up needed, and more testing needed | |
18 | ||
19 | d) Kerberos/SPNEGO session setup support - (started) | |
20 | ||
21 | e) NTLMv2 authentication (mostly implemented) | |
22 | ||
23 | f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup | |
24 | used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM | |
25 | and raw NTLMSSP already. This is important when enabling | |
26 | extended security and mounting to Windows 2003 Servers | |
27 | ||
28 | f) Directory entry caching relies on a 1 second timer, rather than | |
29 | using FindNotify or equivalent. - (started) | |
30 | ||
31 | g) A few byte range testcases fail due to POSIX vs. Windows/CIFS | |
32 | style byte range lock differences | |
33 | ||
34 | h) quota support | |
35 | ||
36 | j) finish writepages support (multi-page write behind for improved | |
37 | performance) and syncpage | |
38 | ||
39 | k) hook lower into the sockets api (as NFS/SunRPC does) to avoid the | |
40 | extra copy in/out of the socket buffers in some cases. | |
41 | ||
42 | l) finish support for IPv6. This is mostly complete but | |
43 | needs a simple conversion of ipv6 to sin6_addr from the | |
44 | address in string representation. | |
45 | ||
46 | m) Better optimize open (and pathbased setfilesize) to reduce the | |
47 | oplock breaks coming from windows srv. Piggyback identical file | |
48 | opens on top of each other by incrementing reference count rather | |
49 | than resending (helps reduce server resource utilization and avoid | |
50 | spurious oplock breaks). | |
51 | ||
52 | o) Improve performance of readpages by sending more than one read | |
53 | at a time when 8 pages or more are requested. In conjuntion | |
54 | add support for async_cifs_readpages. | |
55 | ||
56 | p) Add support for storing symlink and fifo info to Windows servers | |
57 | in the Extended Attribute format their SFU clients would recognize. | |
58 | ||
59 | q) Finish fcntl D_NOTIFY support so kde and gnome file list windows | |
60 | will autorefresh (started) | |
61 | ||
62 | r) Add GUI tool to configure /proc/fs/cifs settings and for display of | |
63 | the CIFS statistics (started) | |
64 | ||
65 | q) implement support for security and trusted categories of xattrs | |
66 | (requires minor protocol extension) to enable better support for SELINUX | |
67 | ||
68 | r) Implement O_DIRECT flag on open (already supported on mount) | |
69 | ||
70 | KNOWN BUGS (updated December 10, 2004) | |
71 | ==================================== | |
72 | 1) existing symbolic links (Windows reparse points) are recognized but | |
73 | can not be created remotely. They are implemented for Samba and those that | |
74 | support the CIFS Unix extensions but Samba has a bug currently handling | |
75 | symlink text beginning with slash | |
76 | 2) follow_link and readdir code does not follow dfs junctions | |
77 | but recognizes them | |
78 | 3) create of new files to FAT partitions on Windows servers can | |
79 | succeed but still return access denied (appears to be Windows | |
80 | server not cifs client problem) and has not been reproduced recently. | |
81 | NTFS partitions do not have this problem. | |
82 | 4) debug connectathon lock test case 10 which fails against | |
83 | Samba (may be unmappable due to POSIX to Windows lock model | |
84 | differences but worth investigating). Also debug Samba to | |
85 | see why lock test case 7 takes longer to complete to Samba | |
86 | than to Windows. | |
87 | ||
88 | Misc testing to do | |
89 | ================== | |
90 | 1) check out max path names and max path name components against various server | |
91 | types. Try nested symlinks (8 deep). Return max path name in stat -f information | |
92 | ||
93 | 2) Modify file portion of ltp so it can run against a mounted network | |
94 | share and run it against cifs vfs. | |
95 | ||
96 | 3) Additional performance testing and optimization using iozone and similar - | |
97 | there are some easy changes that can be done to parallelize sequential writes, | |
98 | and when signing is disabled to request larger read sizes (larger than | |
99 | negotiated size) and send larger write sizes to modern servers. | |
100 | ||
101 | 4) More exhaustively test the recently added NT4 support against various | |
102 | NT4 service pack levels, and fix cifs_setattr for setting file times and | |
103 | size to fall back to level 1 when error invalid level returned. | |
104 |