1Version 1.49 April 26, 2007 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(Windows/CIFS ACLs) for chmod/chgrp/chown 11so that these operations can be supported to Windows servers 12 13b) Mapping POSIX ACLs (and eventually NFSv4 ACLs) to CIFS 14SecurityDescriptors 15 16c) Better pam/winbind integration (e.g. to handle uid mapping 17better) 18 19d) Kerberos/SPNEGO session setup support - (started) 20 21e) More testing of NTLMv2 authentication (mostly implemented - double check 22that NTLMv2 signing works, also need to cleanup now unneeded SessSetup code in 23fs/cifs/connect.c) 24 25f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup 26used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM 27and raw NTLMSSP already. This is important when enabling 28extended security and mounting to Windows 2003 Servers 29 30g) Directory entry caching relies on a 1 second timer, rather than 31using FindNotify or equivalent. - (started) 32 33h) quota support (needs minor kernel change since quota calls 34to make it to network filesystems or deviceless filesystems) 35 36i) investigate sync behavior (including syncpage) and check 37for proper behavior of intr/nointr 38 39j) 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 42k) Better optimize open (and pathbased setfilesize) to reduce the 43oplock breaks coming from windows srv. Piggyback identical file 44opens on top of each other by incrementing reference count rather 45than resending (helps reduce server resource utilization and avoid 46spurious oplock breaks). 47 48l) Improve performance of readpages by sending more than one read 49at a time when 8 pages or more are requested. In conjuntion 50add support for async_cifs_readpages. 51 52m) Add support for storing symlink info to Windows servers 53in the Extended Attribute format their SFU clients would recognize. 54 55n) Finish fcntl D_NOTIFY support so kde and gnome file list windows 56will autorefresh (partially complete by Asser). Needs minor kernel 57vfs change to support removing D_NOTIFY on a file. 58 59o) Add GUI tool to configure /proc/fs/cifs settings and for display of 60the CIFS statistics (started) 61 62p) implement support for security and trusted categories of xattrs 63(requires minor protocol extension) to enable better support for SELINUX 64 65q) Implement O_DIRECT flag on open (already supported on mount) 66 67r) Create UID mapping facility so server UIDs can be mapped on a per 68mount or a per server basis to client UIDs or nobody if no mapping 69exists. This is helpful when Unix extensions are negotiated to 70allow better permission checking when UIDs differ on the server 71and client. Add new protocol request to the CIFS protocol 72standard for asking the server for the corresponding name of a 73particular uid. 74 75s) Add support for CIFS Unix and also the newer POSIX extensions to the 76server side for Samba 4. 77 78t) In support for OS/2 (LANMAN 1.2 and LANMAN2.1 based SMB servers) 79need to add ability to set time to server (utimes command) 80 81u) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too) 82 83v) mount check for unmatched uids 84 85w) Add mount option for Linux extension disable per mount, and partial 86disable per mount (uid off, symlink/fifo/mknod on but what about posix acls?) 87 88x) Fix Samba 3 server to handle Linux kernel aio so dbench with lots of 89processes can proceed better in parallel (on the server) 90 91y) Fix Samba 3 to handle reads/writes over 127K (and remove the cifs mount 92restriction of wsize max being 127K) 93 94KNOWN BUGS (updated April 24, 2007) 95==================================== 96See http://bugzilla.samba.org - search on product "CifsVFS" for 97current bug list. 98 991) existing symbolic links (Windows reparse points) are recognized but 100can not be created remotely. They are implemented for Samba and those that 101support the CIFS Unix extensions, although earlier versions of Samba 102overly restrict the pathnames. 1032) follow_link and readdir code does not follow dfs junctions 104but recognizes them 1053) create of new files to FAT partitions on Windows servers can 106succeed but still return access denied (appears to be Windows 107server not cifs client problem) and has not been reproduced recently. 108NTFS partitions do not have this problem. 109 110Misc testing to do 111================== 1121) check out max path names and max path name components against various server 113types. Try nested symlinks (8 deep). Return max path name in stat -f information 114 1152) Modify file portion of ltp so it can run against a mounted network 116share and run it against cifs vfs in automated fashion. 117 1183) Additional performance testing and optimization using iozone and similar - 119there are some easy changes that can be done to parallelize sequential writes, 120and when signing is disabled to request larger read sizes (larger than 121negotiated size) and send larger write sizes to modern servers. 122 1234) More exhaustively test against less common servers. More testing 124against Windows 9x, Windows ME servers. 125