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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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2
fs/nfs/nfs4_fs.h
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@@ -208,6 +208,7 @@ struct nfs4_state_maintenance_ops {
struct nfs4_mig_recovery_ops {
int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
struct page *, struct rpc_cred *);
int (*fsid_present)(struct inode *, struct rpc_cred *);
};
extern const struct dentry_operations nfs4_dentry_operations;
@@ -242,6 +243,7 @@ extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struc
struct nfs4_fs_locations *, struct page *);
extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
struct page *page, struct rpc_cred *);
extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
struct nfs_fh *, struct nfs_fattr *);
extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);