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NFS: Add method to detect whether an FSID is still on the server

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Introduce a mechanism for probing a server to determine if an FSID
is present or absent.

The on-the-wire compound is different between minor version 0 and 1.
Minor version 0 appends a RENEW operation to identify which client
ID is probing.  Minor version 1 has a SEQUENCE operation in the
compound which effectively carries the same information.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2013-10-17 14:13:30 -04:00 • committed by Trond Myklebust
parent 352297b917
commit 44c9993384
5 changed files with 209 additions and 2 deletions
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1
include/linux/nfs4.h
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@ -460,6 +460,7 @@ enum {
NFSPROC4_CLNT_FS_LOCATIONS,
NFSPROC4_CLNT_RELEASE_LOCKOWNER,
NFSPROC4_CLNT_SECINFO,
NFSPROC4_CLNT_FSID_PRESENT,
/* nfs41 */
NFSPROC4_CLNT_EXCHANGE_ID,