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CIFS: Introduce SMB2 Kconfig option 

SMB2 is the followon to the CIFS (and SMB) protocols
and the default for Windows since Windows Vista, and also
now implemented by various non-Windows servers. SMB2
is more secure, has various performance advantages, including
larger i/o sizes, flow control, better caching model and more.
SMB2 also resolves some scalability limits in the CIFS
protocol and adds many new features while being much
simpler (only a few dozen commands instead of hundreds)
and since the protocol is clearer it is also more consistently
implemented across servers and thus easier to optimize.

After much discussion with Jeff Layton, Jeremy Allison
and others at Connectathon, we decided to move the SMB2
code from a distinct .ko and fstype into distinct
C files that optionally build in cifs.ko. As a result
the Kconfig gets simpler.

To avoid destabilizing CIFS, the SMB2 code is going
to be moved into its own experimental CONFIG_CIFS_SMB2 ifdef
as it is merged and rereviewed. The changes to stable
CIFS (builds with the SMB2 ifdef off) are expected to be
fairly small.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2011-02-24 17:58:00 +00:00 committed by Pavel Shilovsky
parent 452757897a
commit 675f36fb1d
1 changed files with 20 additions and 0 deletions
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fs/cifs/Kconfig
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@ -158,3 +158,23 @@ config CIFS_NFSD_EXPORT
depends on CIFS && EXPERIMENTAL && BROKEN
help
Allows NFS server to export a CIFS mounted share (nfsd over cifs)
config CIFS_SMB2
bool "SMB2 network file system support (EXPERIMENTAL)"
depends on EXPERIMENTAL && INET && BROKEN
select NLS
select KEYS
select FSCACHE
select DNS_RESOLVER
help
This enables experimental support for the SMB2 (Server Message Block
version 2) protocol. The SMB2 protocol is the successor to the
popular CIFS and SMB network file sharing protocols. SMB2 is the
native file sharing mechanism for recent versions of Windows
operating systems (since Vista). SMB2 enablement will eventually
allow users better performance, security and features, than would be
possible with cifs. Note that smb2 mount options also are simpler
(compared to cifs) due to protocol improvements.
Unless you are a developer or tester, say N.