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NFS: Add nfs4_update_server

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New function nfs4_update_server() moves an nfs_server to a different
nfs_client.  This is done as part of migration recovery.

Though it may be appealing to think of them as the same thing,
migration recovery is not the same as following a referral.

For a referral, the client has not descended into the file system
yet: it has no nfs_server, no super block, no inodes or open state.
It is enough to simply instantiate the nfs_server and super block,
and perform a referral mount.

For a migration, however, we have all of those things already, and
they have to be moved to a different nfs_client.  No local namespace
changes are needed here.

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 14:12:28 -04:00
committed by Trond Myklebust
parent 40b00b6b17
commit 32e62b7c3e
3 changed files with 113 additions and 1 deletions
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3
fs/nfs/client.c
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@@ -945,7 +945,7 @@ void nfs_server_insert_lists(struct nfs_server *server)
}
EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
static void nfs_server_remove_lists(struct nfs_server *server)
void nfs_server_remove_lists(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs_net *nn;
@@ -962,6 +962,7 @@ static void nfs_server_remove_lists(struct nfs_server *server)
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
/*
* Allocate and initialise a server record