NFSv4: Convert idmapper to use the new framework for pipefs dentries

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-08-26 17:16:17 -04:00
parent 5f42b016d7
commit 2127d82af3

View file

@ -64,6 +64,7 @@ struct idmap_legacy_upcalldata {
};
struct idmap {
struct rpc_pipe_dir_object idmap_pdo;
struct rpc_pipe *idmap_pipe;
struct idmap_legacy_upcalldata *idmap_upcall_data;
struct mutex idmap_mutex;
@ -402,18 +403,23 @@ static struct key_type key_type_id_resolver_legacy = {
.request_key = nfs_idmap_legacy_upcall,
};
static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
static void nfs_idmap_pipe_destroy(struct dentry *dir,
struct rpc_pipe_dir_object *pdo)
{
struct idmap *idmap = pdo->pdo_data;
struct rpc_pipe *pipe = idmap->idmap_pipe;
if (pipe->dentry) {
rpc_unlink(pipe->dentry);
pipe->dentry = NULL;
}
}
static int __nfs_idmap_register(struct dentry *dir,
struct idmap *idmap,
struct rpc_pipe *pipe)
static int nfs_idmap_pipe_create(struct dentry *dir,
struct rpc_pipe_dir_object *pdo)
{
struct idmap *idmap = pdo->pdo_data;
struct rpc_pipe *pipe = idmap->idmap_pipe;
struct dentry *dentry;
dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
@ -423,36 +429,10 @@ static int __nfs_idmap_register(struct dentry *dir,
return 0;
}
static void nfs_idmap_unregister(struct nfs_client *clp,
struct rpc_pipe *pipe)
{
struct net *net = clp->cl_net;
struct super_block *pipefs_sb;
pipefs_sb = rpc_get_sb_net(net);
if (pipefs_sb) {
__nfs_idmap_unregister(pipe);
rpc_put_sb_net(net);
}
}
static int nfs_idmap_register(struct nfs_client *clp,
struct idmap *idmap,
struct rpc_pipe *pipe)
{
struct net *net = clp->cl_net;
struct super_block *pipefs_sb;
int err = 0;
pipefs_sb = rpc_get_sb_net(net);
if (pipefs_sb) {
if (clp->cl_rpcclient->cl_dentry)
err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
idmap, pipe);
rpc_put_sb_net(net);
}
return err;
}
static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
.create = nfs_idmap_pipe_create,
.destroy = nfs_idmap_pipe_destroy,
};
int
nfs_idmap_new(struct nfs_client *clp)
@ -465,23 +445,31 @@ nfs_idmap_new(struct nfs_client *clp)
if (idmap == NULL)
return -ENOMEM;
rpc_init_pipe_dir_object(&idmap->idmap_pdo,
&nfs_idmap_pipe_dir_object_ops,
idmap);
pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
if (IS_ERR(pipe)) {
error = PTR_ERR(pipe);
kfree(idmap);
return error;
}
error = nfs_idmap_register(clp, idmap, pipe);
if (error) {
rpc_destroy_pipe_data(pipe);
kfree(idmap);
return error;
goto err;
}
idmap->idmap_pipe = pipe;
mutex_init(&idmap->idmap_mutex);
error = rpc_add_pipe_dir_object(clp->cl_net,
&clp->cl_rpcclient->cl_pipedir_objects,
&idmap->idmap_pdo);
if (error)
goto err_destroy_pipe;
clp->cl_idmap = idmap;
return 0;
err_destroy_pipe:
rpc_destroy_pipe_data(idmap->idmap_pipe);
err:
kfree(idmap);
return error;
}
void
@ -491,130 +479,26 @@ nfs_idmap_delete(struct nfs_client *clp)
if (!idmap)
return;
nfs_idmap_unregister(clp, idmap->idmap_pipe);
rpc_destroy_pipe_data(idmap->idmap_pipe);
clp->cl_idmap = NULL;
rpc_remove_pipe_dir_object(clp->cl_net,
&clp->cl_rpcclient->cl_pipedir_objects,
&idmap->idmap_pdo);
rpc_destroy_pipe_data(idmap->idmap_pipe);
kfree(idmap);
}
static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
struct super_block *sb)
{
int err = 0;
switch (event) {
case RPC_PIPEFS_MOUNT:
err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
clp->cl_idmap,
clp->cl_idmap->idmap_pipe);
break;
case RPC_PIPEFS_UMOUNT:
if (clp->cl_idmap->idmap_pipe) {
struct dentry *parent;
parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
__nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
/*
* Note: This is a dirty hack. SUNRPC hook has been
* called already but simple_rmdir() call for the
* directory returned with error because of idmap pipe
* inside. Thus now we have to remove this directory
* here.
*/
if (rpc_rmdir(parent))
printk(KERN_ERR "NFS: %s: failed to remove "
"clnt dir!\n", __func__);
}
break;
default:
printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
event);
return -ENOTSUPP;
}
return err;
}
static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
{
struct nfs_net *nn = net_generic(net, nfs_net_id);
struct dentry *cl_dentry;
struct nfs_client *clp;
int err;
restart:
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
/* Wait for initialisation to finish */
if (clp->cl_cons_state == NFS_CS_INITING) {
atomic_inc(&clp->cl_count);
spin_unlock(&nn->nfs_client_lock);
err = nfs_wait_client_init_complete(clp);
nfs_put_client(clp);
if (err)
return NULL;
goto restart;
}
/* Skip nfs_clients that failed to initialise */
if (clp->cl_cons_state < 0)
continue;
smp_rmb();
if (clp->rpc_ops != &nfs_v4_clientops)
continue;
cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nn->nfs_client_lock);
return clp;
}
spin_unlock(&nn->nfs_client_lock);
return NULL;
}
static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct super_block *sb = ptr;
struct nfs_client *clp;
int error = 0;
if (!try_module_get(THIS_MODULE))
return 0;
while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
error = __rpc_pipefs_event(clp, event, sb);
nfs_put_client(clp);
if (error)
break;
}
module_put(THIS_MODULE);
return error;
}
#define PIPEFS_NFS_PRIO 1
static struct notifier_block nfs_idmap_block = {
.notifier_call = rpc_pipefs_event,
.priority = SUNRPC_PIPEFS_NFS_PRIO,
};
int nfs_idmap_init(void)
{
int ret;
ret = nfs_idmap_init_keyring();
if (ret != 0)
goto out;
ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
if (ret != 0)
nfs_idmap_quit_keyring();
out:
return ret;
}
void nfs_idmap_quit(void)
{
rpc_pipefs_notifier_unregister(&nfs_idmap_block);
nfs_idmap_quit_keyring();
}