| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | |