105 lines
4 KiB
Text
105 lines
4 KiB
Text
|
Version 2.03 August 1, 2014
|
||
|
|
|
||
|
|
A Partial List of Missing Features
|
||
|
|
==================================
|
||
|
|
|
||
|
|
Contributions are welcome. There are plenty of opportunities
|
||
|
|
for visible, important contributions to this module. Here
|
||
|
|
is a partial list of the known problems and missing features:
|
||
|
|
|
||
|
|
a) SMB3 (and SMB3.02) missing optional features:
|
||
|
|
- RDMA
|
||
|
|
- multichannel (started)
|
||
|
|
- directory leases (improved metadata caching)
|
||
|
|
- T10 copy offload (copy chunk is only mechanism supported)
|
||
|
|
- encrypted shares
|
||
|
|
|
||
|
|
b) improved sparse file support
|
||
|
|
|
||
|
|
c) Directory entry caching relies on a 1 second timer, rather than
|
||
|
|
using FindNotify or equivalent. - (started)
|
||
|
|
|
||
|
|
d) quota support (needs minor kernel change since quota calls
|
||
|
|
to make it to network filesystems or deviceless filesystems)
|
||
|
|
|
||
|
|
e) improve support for very old servers (OS/2 and Win9x for example)
|
||
|
|
Including support for changing the time remotely (utimes command).
|
||
|
|
|
||
|
|
f) hook lower into the sockets api (as NFS/SunRPC does) to avoid the
|
||
|
|
extra copy in/out of the socket buffers in some cases.
|
||
|
|
|
||
|
|
g) Better optimize open (and pathbased setfilesize) to reduce the
|
||
|
|
oplock breaks coming from windows srv. Piggyback identical file
|
||
|
|
opens on top of each other by incrementing reference count rather
|
||
|
|
than resending (helps reduce server resource utilization and avoid
|
||
|
|
spurious oplock breaks).
|
||
|
|
|
||
|
|
h) Add support for storing symlink info to Windows servers
|
||
|
|
in the Extended Attribute format their SFU clients would recognize.
|
||
|
|
|
||
|
|
i) Finish inotify support so kde and gnome file list windows
|
||
|
|
will autorefresh (partially complete by Asser). Needs minor kernel
|
||
|
|
vfs change to support removing D_NOTIFY on a file.
|
||
|
|
|
||
|
|
j) Add GUI tool to configure /proc/fs/cifs settings and for display of
|
||
|
|
the CIFS statistics (started)
|
||
|
|
|
||
|
|
k) implement support for security and trusted categories of xattrs
|
||
|
|
(requires minor protocol extension) to enable better support for SELINUX
|
||
|
|
|
||
|
|
l) Implement O_DIRECT flag on open (already supported on mount)
|
||
|
|
|
||
|
|
m) Create UID mapping facility so server UIDs can be mapped on a per
|
||
|
|
mount or a per server basis to client UIDs or nobody if no mapping
|
||
|
|
exists. This is helpful when Unix extensions are negotiated to
|
||
|
|
allow better permission checking when UIDs differ on the server
|
||
|
|
and client. Add new protocol request to the CIFS protocol
|
||
|
|
standard for asking the server for the corresponding name of a
|
||
|
|
particular uid.
|
||
|
|
|
||
|
|
n) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too)
|
||
|
|
|
||
|
|
o) mount check for unmatched uids
|
||
|
|
|
||
|
|
p) Add support for new vfs entry point for fallocate
|
||
|
|
|
||
|
|
q) Add tools to take advantage of cifs/smb3 specific ioctls and features
|
||
|
|
such as "CopyChunk" (fast server side file copy)
|
||
|
|
|
||
|
|
r) encrypted file support
|
||
|
|
|
||
|
|
s) improved stats gathering, tools (perhaps integration with nfsometer?)
|
||
|
|
|
||
|
|
t) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
|
||
|
|
file attribute via chflags)
|
||
|
|
|
||
|
|
u) mount helper GUI (to simplify the various configuration options on mount)
|
||
|
|
|
||
|
|
|
||
|
|
KNOWN BUGS
|
||
|
|
====================================
|
||
|
|
See http://bugzilla.samba.org - search on product "CifsVFS" for
|
||
|
|
current bug list. Also check http://bugzilla.kernel.org (Product = File System, Component = CIFS)
|
||
|
|
|
||
|
|
1) existing symbolic links (Windows reparse points) are recognized but
|
||
|
|
can not be created remotely. They are implemented for Samba and those that
|
||
|
|
support the CIFS Unix extensions, although earlier versions of Samba
|
||
|
|
overly restrict the pathnames.
|
||
|
|
2) follow_link and readdir code does not follow dfs junctions
|
||
|
|
but recognizes them
|
||
|
|
|
||
|
|
Misc testing to do
|
||
|
|
==================
|
||
|
|
1) check out max path names and max path name components against various server
|
||
|
|
types. Try nested symlinks (8 deep). Return max path name in stat -f information
|
||
|
|
|
||
|
|
2) Improve xfstest's cifs enablement and adapt xfstests where needed to test
|
||
|
|
cifs better
|
||
|
|
|
||
|
|
3) Additional performance testing and optimization using iozone and similar -
|
||
|
|
there are some easy changes that can be done to parallelize sequential writes,
|
||
|
|
and when signing is disabled to request larger read sizes (larger than
|
||
|
|
negotiated size) and send larger write sizes to modern servers.
|
||
|
|
|
||
|
|
4) More exhaustively test against less common servers
|