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
Родитель
5f42b016d7
Коммит
2127d82af3
184
fs/nfs/idmap.c
184
fs/nfs/idmap.c
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@ -64,6 +64,7 @@ struct idmap_legacy_upcalldata {
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};
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struct idmap {
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struct rpc_pipe_dir_object idmap_pdo;
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struct rpc_pipe *idmap_pipe;
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struct idmap_legacy_upcalldata *idmap_upcall_data;
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struct mutex idmap_mutex;
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@ -402,18 +403,23 @@ static struct key_type key_type_id_resolver_legacy = {
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.request_key = nfs_idmap_legacy_upcall,
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};
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static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
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static void nfs_idmap_pipe_destroy(struct dentry *dir,
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struct rpc_pipe_dir_object *pdo)
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{
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struct idmap *idmap = pdo->pdo_data;
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struct rpc_pipe *pipe = idmap->idmap_pipe;
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if (pipe->dentry) {
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rpc_unlink(pipe->dentry);
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pipe->dentry = NULL;
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}
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}
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static int __nfs_idmap_register(struct dentry *dir,
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struct idmap *idmap,
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struct rpc_pipe *pipe)
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static int nfs_idmap_pipe_create(struct dentry *dir,
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struct rpc_pipe_dir_object *pdo)
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{
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struct idmap *idmap = pdo->pdo_data;
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struct rpc_pipe *pipe = idmap->idmap_pipe;
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struct dentry *dentry;
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dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
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@ -423,36 +429,10 @@ static int __nfs_idmap_register(struct dentry *dir,
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return 0;
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}
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static void nfs_idmap_unregister(struct nfs_client *clp,
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struct rpc_pipe *pipe)
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{
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struct net *net = clp->cl_net;
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struct super_block *pipefs_sb;
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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__nfs_idmap_unregister(pipe);
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rpc_put_sb_net(net);
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}
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}
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static int nfs_idmap_register(struct nfs_client *clp,
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struct idmap *idmap,
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struct rpc_pipe *pipe)
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{
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struct net *net = clp->cl_net;
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struct super_block *pipefs_sb;
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int err = 0;
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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if (clp->cl_rpcclient->cl_dentry)
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err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
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idmap, pipe);
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rpc_put_sb_net(net);
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}
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return err;
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}
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static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
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.create = nfs_idmap_pipe_create,
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.destroy = nfs_idmap_pipe_destroy,
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};
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int
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nfs_idmap_new(struct nfs_client *clp)
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@ -465,23 +445,31 @@ nfs_idmap_new(struct nfs_client *clp)
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if (idmap == NULL)
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return -ENOMEM;
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rpc_init_pipe_dir_object(&idmap->idmap_pdo,
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&nfs_idmap_pipe_dir_object_ops,
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idmap);
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pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
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if (IS_ERR(pipe)) {
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error = PTR_ERR(pipe);
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kfree(idmap);
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return error;
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}
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error = nfs_idmap_register(clp, idmap, pipe);
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if (error) {
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rpc_destroy_pipe_data(pipe);
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kfree(idmap);
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return error;
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goto err;
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}
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idmap->idmap_pipe = pipe;
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mutex_init(&idmap->idmap_mutex);
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error = rpc_add_pipe_dir_object(clp->cl_net,
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&clp->cl_rpcclient->cl_pipedir_objects,
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&idmap->idmap_pdo);
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if (error)
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goto err_destroy_pipe;
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clp->cl_idmap = idmap;
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return 0;
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err_destroy_pipe:
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rpc_destroy_pipe_data(idmap->idmap_pipe);
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err:
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kfree(idmap);
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return error;
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}
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void
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@ -491,130 +479,26 @@ nfs_idmap_delete(struct nfs_client *clp)
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if (!idmap)
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return;
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nfs_idmap_unregister(clp, idmap->idmap_pipe);
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rpc_destroy_pipe_data(idmap->idmap_pipe);
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clp->cl_idmap = NULL;
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rpc_remove_pipe_dir_object(clp->cl_net,
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&clp->cl_rpcclient->cl_pipedir_objects,
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&idmap->idmap_pdo);
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rpc_destroy_pipe_data(idmap->idmap_pipe);
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kfree(idmap);
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}
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static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
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struct super_block *sb)
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{
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int err = 0;
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switch (event) {
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case RPC_PIPEFS_MOUNT:
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err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
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clp->cl_idmap,
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clp->cl_idmap->idmap_pipe);
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break;
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case RPC_PIPEFS_UMOUNT:
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if (clp->cl_idmap->idmap_pipe) {
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struct dentry *parent;
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parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
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__nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
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/*
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* Note: This is a dirty hack. SUNRPC hook has been
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* called already but simple_rmdir() call for the
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* directory returned with error because of idmap pipe
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* inside. Thus now we have to remove this directory
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* here.
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*/
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if (rpc_rmdir(parent))
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printk(KERN_ERR "NFS: %s: failed to remove "
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"clnt dir!\n", __func__);
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}
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break;
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default:
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printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
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event);
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return -ENOTSUPP;
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}
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return err;
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}
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static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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struct dentry *cl_dentry;
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struct nfs_client *clp;
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int err;
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restart:
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spin_lock(&nn->nfs_client_lock);
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list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
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/* Wait for initialisation to finish */
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if (clp->cl_cons_state == NFS_CS_INITING) {
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atomic_inc(&clp->cl_count);
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spin_unlock(&nn->nfs_client_lock);
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err = nfs_wait_client_init_complete(clp);
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nfs_put_client(clp);
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if (err)
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return NULL;
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goto restart;
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}
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/* Skip nfs_clients that failed to initialise */
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if (clp->cl_cons_state < 0)
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continue;
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smp_rmb();
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if (clp->rpc_ops != &nfs_v4_clientops)
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continue;
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cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
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if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
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((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
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continue;
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atomic_inc(&clp->cl_count);
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spin_unlock(&nn->nfs_client_lock);
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return clp;
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}
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spin_unlock(&nn->nfs_client_lock);
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return NULL;
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}
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static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
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void *ptr)
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{
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struct super_block *sb = ptr;
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struct nfs_client *clp;
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int error = 0;
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if (!try_module_get(THIS_MODULE))
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return 0;
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while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
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error = __rpc_pipefs_event(clp, event, sb);
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nfs_put_client(clp);
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if (error)
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break;
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}
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module_put(THIS_MODULE);
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return error;
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}
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#define PIPEFS_NFS_PRIO 1
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static struct notifier_block nfs_idmap_block = {
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.notifier_call = rpc_pipefs_event,
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.priority = SUNRPC_PIPEFS_NFS_PRIO,
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};
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int nfs_idmap_init(void)
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{
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int ret;
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ret = nfs_idmap_init_keyring();
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if (ret != 0)
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goto out;
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ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
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if (ret != 0)
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nfs_idmap_quit_keyring();
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out:
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return ret;
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}
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void nfs_idmap_quit(void)
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{
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rpc_pipefs_notifier_unregister(&nfs_idmap_block);
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nfs_idmap_quit_keyring();
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}
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