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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/cifs/TODO
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1version 1.22 July 30, 2004
2
3A Partial List of Missing Features
4==================================
5
6Contributions are welcome. There are plenty of opportunities
7for visible, important contributions to this module. Here
8is a partial list of the known problems and missing features:
9
10a) Support for SecurityDescriptors for chmod/chgrp/chown so
11these can be supported for Windows servers
12
13b) Better pam/winbind integration (e.g. to handle uid mapping
14better)
15
16c) multi-user mounts - multiplexed sessionsetups over single vc
17(ie tcp session) - prettying up needed, and more testing needed
18
19d) Kerberos/SPNEGO session setup support - (started)
20
21e) NTLMv2 authentication (mostly implemented)
22
23f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup
24used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM
25and raw NTLMSSP already. This is important when enabling
26extended security and mounting to Windows 2003 Servers
27
28f) Directory entry caching relies on a 1 second timer, rather than
29using FindNotify or equivalent. - (started)
30
31g) A few byte range testcases fail due to POSIX vs. Windows/CIFS
32style byte range lock differences
33
34h) quota support
35
36j) finish writepages support (multi-page write behind for improved
37performance) and syncpage
38
39k) hook lower into the sockets api (as NFS/SunRPC does) to avoid the
40extra copy in/out of the socket buffers in some cases.
41
42l) finish support for IPv6. This is mostly complete but
43needs a simple conversion of ipv6 to sin6_addr from the
44address in string representation.
45
46m) Better optimize open (and pathbased setfilesize) to reduce the
47oplock breaks coming from windows srv. Piggyback identical file
48opens on top of each other by incrementing reference count rather
49than resending (helps reduce server resource utilization and avoid
50spurious oplock breaks).
51
52o) Improve performance of readpages by sending more than one read
53at a time when 8 pages or more are requested. In conjuntion
54add support for async_cifs_readpages.
55
56p) Add support for storing symlink and fifo info to Windows servers
57in the Extended Attribute format their SFU clients would recognize.
58
59q) Finish fcntl D_NOTIFY support so kde and gnome file list windows
60will autorefresh (started)
61
62r) Add GUI tool to configure /proc/fs/cifs settings and for display of
63the CIFS statistics (started)
64
65q) implement support for security and trusted categories of xattrs
66(requires minor protocol extension) to enable better support for SELINUX
67
68r) Implement O_DIRECT flag on open (already supported on mount)
69
70KNOWN BUGS (updated December 10, 2004)
71====================================
721) existing symbolic links (Windows reparse points) are recognized but
73can not be created remotely. They are implemented for Samba and those that
74support the CIFS Unix extensions but Samba has a bug currently handling
75symlink text beginning with slash
762) follow_link and readdir code does not follow dfs junctions
77but recognizes them
783) create of new files to FAT partitions on Windows servers can
79succeed but still return access denied (appears to be Windows
80server not cifs client problem) and has not been reproduced recently.
81NTFS partitions do not have this problem.
824) debug connectathon lock test case 10 which fails against
83Samba (may be unmappable due to POSIX to Windows lock model
84differences but worth investigating). Also debug Samba to
85see why lock test case 7 takes longer to complete to Samba
86than to Windows.
87
88Misc testing to do
89==================
901) check out max path names and max path name components against various server
91types. Try nested symlinks (8 deep). Return max path name in stat -f information
92
932) Modify file portion of ltp so it can run against a mounted network
94share and run it against cifs vfs.
95
963) Additional performance testing and optimization using iozone and similar -
97there are some easy changes that can be done to parallelize sequential writes,
98and when signing is disabled to request larger read sizes (larger than
99negotiated size) and send larger write sizes to modern servers.
100
1014) More exhaustively test the recently added NT4 support against various
102NT4 service pack levels, and fix cifs_setattr for setting file times and
103size to fall back to level 1 when error invalid level returned.
104