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NFS: Add a dns resolver for use with NFSv4 referrals and migration

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The NFSv4 and NFSv4.1 protocols both allow for the redirection of a client
from one server to another in order to support filesystem migration and
replication. For full protocol support, we need to add the ability to
convert a DNS host name into an IP address that we can feed to the RPC
client.

We'll reuse the sunrpc cache, now that it has been converted to work with
rpc_pipefs.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2009-08-19 18:12:27 -04:00
parent 96c61cbd0f
commit e571cbf1a4
9 changed files with 639 additions and 1 deletions
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7
net/sunrpc/rpc_pipe.c
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@ -416,11 +416,13 @@ struct vfsmount *rpc_get_mount(void)
return ERR_PTR(err);
return rpc_mount;
}
EXPORT_SYMBOL_GPL(rpc_get_mount);
void rpc_put_mount(void)
{
simple_release_fs(&rpc_mount, &rpc_mount_count);
}
EXPORT_SYMBOL_GPL(rpc_put_mount);
static int rpc_delete_dentry(struct dentry *dentry)
{
@ -946,6 +948,7 @@ enum {
RPCAUTH_portmap,
RPCAUTH_statd,
RPCAUTH_nfsd4_cb,
RPCAUTH_cache,
RPCAUTH_RootEOF
};
@ -974,6 +977,10 @@ static const struct rpc_filelist files[] = {
.name = "nfsd4_cb",
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
},
[RPCAUTH_cache] = {
.name = "cache",
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
},
};
static int