diff options
| -rw-r--r-- | fs/nfs/blocklayout/blocklayout.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c index 9da72b8a554..df05b946514 100644 --- a/fs/nfs/blocklayout/blocklayout.c +++ b/fs/nfs/blocklayout/blocklayout.c @@ -1044,6 +1044,48 @@ static void nfs4blocklayout_unregister_sb(struct super_block *sb, rpc_unlink(pipe->dentry); } +static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct super_block *sb = ptr; + struct net *net = sb->s_fs_info; + struct nfs_net *nn = net_generic(net, nfs_net_id); + struct dentry *dentry; + int ret = 0; + + if (!try_module_get(THIS_MODULE)) + return 0; + + if (nn->bl_device_pipe == NULL) { + module_put(THIS_MODULE); + return 0; + } + + switch (event) { + case RPC_PIPEFS_MOUNT: + dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + break; + } + nn->bl_device_pipe->dentry = dentry; + break; + case RPC_PIPEFS_UMOUNT: + if (nn->bl_device_pipe->dentry) + nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); + break; + default: + ret = -ENOTSUPP; + break; + } + module_put(THIS_MODULE); + return ret; +} + +static struct notifier_block nfs4blocklayout_block = { + .notifier_call = rpc_pipefs_event, +}; + static struct dentry *nfs4blocklayout_register_net(struct net *net, struct rpc_pipe *pipe) { @@ -1119,12 +1161,17 @@ static int __init nfs4blocklayout_init(void) ret = PTR_ERR(mnt); goto out_remove; } - ret = register_pernet_subsys(&nfs4blocklayout_net_ops); + ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); if (ret) goto out_remove; + ret = register_pernet_subsys(&nfs4blocklayout_net_ops); + if (ret) + goto out_notifier; out: return ret; +out_notifier: + rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); out_remove: pnfs_unregister_layoutdriver(&blocklayout_type); return ret; @@ -1135,6 +1182,7 @@ static void __exit nfs4blocklayout_exit(void) dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", __func__); + rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); unregister_pernet_subsys(&nfs4blocklayout_net_ops); pnfs_unregister_layoutdriver(&blocklayout_type); } |