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authorSteve French <sfrench@us.ibm.com>2008-10-23 04:42:37 +0000
committerSteve French <sfrench@us.ibm.com>2008-10-23 04:42:37 +0000
commit84210e9120a8c01a14379ba1f9a9b0f963641d94 (patch)
treeed20b210bb554f283d8458ee6d146a5c4439e37f /fs/cifs/README
parenta364bc0b37f14ffd66c1f982af42990a9d77fa43 (diff)
[CIFS] improve setlease handling
fcntl(F_SETLEASE) currently is not exported by cifs (nor by local file systems) so cifs grants leases based on how other local processes have opened the file not by whether the file is cacheable (oplocked). This adds the check to make sure that the file is cacheable on the client before checking whether we can grant the lease locally (generic_setlease). It also adds a mount option for cifs (locallease) if the user wants to override this and try to grant leases even if the server did not grant oplock. Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/README')
-rw-r--r--fs/cifs/README16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/cifs/README b/fs/cifs/README
index cbe26fe4012..a439dc1739b 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -491,6 +491,19 @@ A partial list of the supported mount options follows:
Note that this differs from the sign mount option in that it
causes encryption of data sent over this mounted share but other
shares mounted to the same server are unaffected.
+ locallease This option is rarely needed. Fcntl F_SETLEASE is
+ used by some applications such as Samba and NFSv4 server to
+ check to see whether a file is cacheable. CIFS has no way
+ to explicitly request a lease, but can check whether a file
+ is cacheable (oplocked). Unfortunately, even if a file
+ is not oplocked, it could still be cacheable (ie cifs client
+ could grant fcntl leases if no other local processes are using
+ the file) for cases for example such as when the server does not
+ support oplocks and the user is sure that the only updates to
+ the file will be from this client. Specifying this mount option
+ will allow the cifs client to check for leases (only) locally
+ for files which are not oplocked instead of denying leases
+ in that case. (EXPERIMENTAL)
sec Security mode. Allowed values are:
none attempt to connection as a null user (no name)
krb5 Use Kerberos version 5 authentication
@@ -641,6 +654,9 @@ requires enabling CONFIG_CIFS_EXPERIMENTAL
cifsacl support needed to retrieve approximated mode bits based on
the contents on the CIFS ACL.
+ lease support: cifs will check the oplock state before calling into
+ the vfs to see if we can grant a lease on a file.
+
DNOTIFY fcntl: needed for support of directory change
notification and perhaps later for file leases)