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deb0420c | 1 | Version 1.49 April 26, 2007 |
1da177e4 LT |
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 | ||
9a899e76 SF |
10 | a) Support for SecurityDescriptors(Windows/CIFS ACLs) for chmod/chgrp/chown |
11 | so that these operations can be supported to Windows servers | |
1da177e4 | 12 | |
9a899e76 SF |
13 | b) Mapping POSIX ACLs (and eventually NFSv4 ACLs) to CIFS |
14 | SecurityDescriptors | |
1da177e4 | 15 | |
9a899e76 SF |
16 | c) Better pam/winbind integration (e.g. to handle uid mapping |
17 | better) | |
1da177e4 | 18 | |
2442421b | 19 | d) Verify that Kerberos signing works |
1da177e4 | 20 | |
b609f06a SF |
21 | e) Cleanup now unneeded SessSetup code in |
22 | fs/cifs/connect.c and add back in NTLMSSP code if any servers | |
23 | need it | |
1da177e4 LT |
24 | |
25 | f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup | |
26 | used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM | |
27 | and raw NTLMSSP already. This is important when enabling | |
28 | extended security and mounting to Windows 2003 Servers | |
29 | ||
deb0420c | 30 | g) Directory entry caching relies on a 1 second timer, rather than |
1da177e4 LT |
31 | using FindNotify or equivalent. - (started) |
32 | ||
deb0420c | 33 | h) quota support (needs minor kernel change since quota calls |
9a899e76 | 34 | to make it to network filesystems or deviceless filesystems) |
1da177e4 | 35 | |
deb0420c | 36 | i) investigate sync behavior (including syncpage) and check |
190fdeb8 | 37 | for proper behavior of intr/nointr |
1da177e4 | 38 | |
deb0420c | 39 | j) hook lower into the sockets api (as NFS/SunRPC does) to avoid the |
1da177e4 LT |
40 | extra copy in/out of the socket buffers in some cases. |
41 | ||
deb0420c | 42 | k) Better optimize open (and pathbased setfilesize) to reduce the |
1da177e4 LT |
43 | oplock breaks coming from windows srv. Piggyback identical file |
44 | opens on top of each other by incrementing reference count rather | |
45 | than resending (helps reduce server resource utilization and avoid | |
46 | spurious oplock breaks). | |
47 | ||
deb0420c | 48 | l) Improve performance of readpages by sending more than one read |
1da177e4 LT |
49 | at a time when 8 pages or more are requested. In conjuntion |
50 | add support for async_cifs_readpages. | |
51 | ||
deb0420c | 52 | m) Add support for storing symlink info to Windows servers |
1da177e4 LT |
53 | in the Extended Attribute format their SFU clients would recognize. |
54 | ||
deb0420c | 55 | n) Finish fcntl D_NOTIFY support so kde and gnome file list windows |
9a899e76 SF |
56 | will autorefresh (partially complete by Asser). Needs minor kernel |
57 | vfs change to support removing D_NOTIFY on a file. | |
1da177e4 | 58 | |
deb0420c | 59 | o) Add GUI tool to configure /proc/fs/cifs settings and for display of |
1da177e4 LT |
60 | the CIFS statistics (started) |
61 | ||
deb0420c | 62 | p) implement support for security and trusted categories of xattrs |
1da177e4 LT |
63 | (requires minor protocol extension) to enable better support for SELINUX |
64 | ||
deb0420c | 65 | q) Implement O_DIRECT flag on open (already supported on mount) |
737b758c | 66 | |
deb0420c | 67 | r) Create UID mapping facility so server UIDs can be mapped on a per |
9ea1f8f5 SF |
68 | mount or a per server basis to client UIDs or nobody if no mapping |
69 | exists. This is helpful when Unix extensions are negotiated to | |
70 | allow better permission checking when UIDs differ on the server | |
71 | and client. Add new protocol request to the CIFS protocol | |
72 | standard for asking the server for the corresponding name of a | |
73 | particular uid. | |
74 | ||
deb0420c | 75 | s) Add support for CIFS Unix and also the newer POSIX extensions to the |
9a899e76 SF |
76 | server side for Samba 4. |
77 | ||
deb0420c | 78 | t) In support for OS/2 (LANMAN 1.2 and LANMAN2.1 based SMB servers) |
35c11fdd | 79 | need to add ability to set time to server (utimes command) |
9a899e76 | 80 | |
deb0420c SF |
81 | u) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too) |
82 | ||
4523cc30 | 83 | v) mount check for unmatched uids |
deb0420c | 84 | |
a403a0a3 | 85 | w) Add support for new vfs entry points for setlease and fallocate |
9a899e76 | 86 | |
deb0420c SF |
87 | x) Fix Samba 3 server to handle Linux kernel aio so dbench with lots of |
88 | processes can proceed better in parallel (on the server) | |
89 | ||
90 | y) Fix Samba 3 to handle reads/writes over 127K (and remove the cifs mount | |
91 | restriction of wsize max being 127K) | |
92 | ||
93 | KNOWN BUGS (updated April 24, 2007) | |
1da177e4 | 94 | ==================================== |
6a0b4824 SF |
95 | See http://bugzilla.samba.org - search on product "CifsVFS" for |
96 | current bug list. | |
97 | ||
1da177e4 LT |
98 | 1) existing symbolic links (Windows reparse points) are recognized but |
99 | can not be created remotely. They are implemented for Samba and those that | |
6a0b4824 SF |
100 | support the CIFS Unix extensions, although earlier versions of Samba |
101 | overly restrict the pathnames. | |
1da177e4 LT |
102 | 2) follow_link and readdir code does not follow dfs junctions |
103 | but recognizes them | |
104 | 3) create of new files to FAT partitions on Windows servers can | |
105 | succeed but still return access denied (appears to be Windows | |
106 | server not cifs client problem) and has not been reproduced recently. | |
107 | NTFS partitions do not have this problem. | |
75865f8c SF |
108 | 4) Unix/POSIX capabilities are reset after reconnection, and affect |
109 | a few fields in the tree connection but we do do not know which | |
110 | superblocks to apply these changes to. We should probably walk | |
111 | the list of superblocks to set these. Also need to check the | |
112 | flags on the second mount to the same share, and see if we | |
113 | can do the same trick that NFS does to remount duplicate shares. | |
1da177e4 LT |
114 | |
115 | Misc testing to do | |
116 | ================== | |
117 | 1) check out max path names and max path name components against various server | |
118 | types. Try nested symlinks (8 deep). Return max path name in stat -f information | |
119 | ||
120 | 2) Modify file portion of ltp so it can run against a mounted network | |
35c11fdd | 121 | share and run it against cifs vfs in automated fashion. |
1da177e4 LT |
122 | |
123 | 3) Additional performance testing and optimization using iozone and similar - | |
124 | there are some easy changes that can be done to parallelize sequential writes, | |
125 | and when signing is disabled to request larger read sizes (larger than | |
126 | negotiated size) and send larger write sizes to modern servers. | |
127 | ||
6a0b4824 SF |
128 | 4) More exhaustively test against less common servers. More testing |
129 | against Windows 9x, Windows ME servers. | |
8af18971 | 130 |