1247 lines
29 KiB
C
1247 lines
29 KiB
C
/*
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* net/sunrpc/rpc_pipe.c
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*
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* Userland/kernel interface for rpcauth_gss.
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* Code shamelessly plagiarized from fs/nfsd/nfsctl.c
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* and fs/sysfs/inode.c
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*
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* Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/pagemap.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/fsnotify.h>
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#include <linux/kernel.h>
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#include <linux/rcupdate.h>
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#include <asm/ioctls.h>
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#include <linux/poll.h>
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#include <linux/wait.h>
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#include <linux/seq_file.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/sunrpc/cache.h>
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#include <linux/nsproxy.h>
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#include <linux/notifier.h>
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#include "netns.h"
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#include "sunrpc.h"
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#define RPCDBG_FACILITY RPCDBG_DEBUG
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#define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "")
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static struct file_system_type rpc_pipe_fs_type;
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static struct kmem_cache *rpc_inode_cachep __read_mostly;
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#define RPC_UPCALL_TIMEOUT (30*HZ)
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static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
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int rpc_pipefs_notifier_register(struct notifier_block *nb)
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{
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return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
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void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
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static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
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void (*destroy_msg)(struct rpc_pipe_msg *), int err)
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{
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struct rpc_pipe_msg *msg;
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if (list_empty(head))
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return;
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do {
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msg = list_entry(head->next, struct rpc_pipe_msg, list);
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list_del_init(&msg->list);
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msg->errno = err;
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destroy_msg(msg);
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} while (!list_empty(head));
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if (waitq)
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wake_up(waitq);
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}
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static void
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rpc_timeout_upcall_queue(struct work_struct *work)
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{
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LIST_HEAD(free_list);
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struct rpc_pipe *pipe =
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container_of(work, struct rpc_pipe, queue_timeout.work);
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void (*destroy_msg)(struct rpc_pipe_msg *);
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struct dentry *dentry;
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spin_lock(&pipe->lock);
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destroy_msg = pipe->ops->destroy_msg;
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if (pipe->nreaders == 0) {
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list_splice_init(&pipe->pipe, &free_list);
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pipe->pipelen = 0;
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}
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dentry = dget(pipe->dentry);
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spin_unlock(&pipe->lock);
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rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL,
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&free_list, destroy_msg, -ETIMEDOUT);
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dput(dentry);
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}
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ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
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char __user *dst, size_t buflen)
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{
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char *data = (char *)msg->data + msg->copied;
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size_t mlen = min(msg->len - msg->copied, buflen);
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unsigned long left;
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left = copy_to_user(dst, data, mlen);
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if (left == mlen) {
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msg->errno = -EFAULT;
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return -EFAULT;
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}
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mlen -= left;
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msg->copied += mlen;
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msg->errno = 0;
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return mlen;
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}
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EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
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/**
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* rpc_queue_upcall - queue an upcall message to userspace
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* @pipe: upcall pipe on which to queue given message
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* @msg: message to queue
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*
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* Call with an @inode created by rpc_mkpipe() to queue an upcall.
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* A userspace process may then later read the upcall by performing a
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* read on an open file for this inode. It is up to the caller to
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* initialize the fields of @msg (other than @msg->list) appropriately.
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*/
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int
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rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
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{
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int res = -EPIPE;
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struct dentry *dentry;
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spin_lock(&pipe->lock);
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if (pipe->nreaders) {
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list_add_tail(&msg->list, &pipe->pipe);
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pipe->pipelen += msg->len;
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res = 0;
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} else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
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if (list_empty(&pipe->pipe))
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queue_delayed_work(rpciod_workqueue,
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&pipe->queue_timeout,
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RPC_UPCALL_TIMEOUT);
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list_add_tail(&msg->list, &pipe->pipe);
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pipe->pipelen += msg->len;
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res = 0;
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}
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dentry = dget(pipe->dentry);
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spin_unlock(&pipe->lock);
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if (dentry) {
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wake_up(&RPC_I(dentry->d_inode)->waitq);
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dput(dentry);
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}
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return res;
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}
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EXPORT_SYMBOL_GPL(rpc_queue_upcall);
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static inline void
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rpc_inode_setowner(struct inode *inode, void *private)
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{
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RPC_I(inode)->private = private;
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}
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static void
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rpc_close_pipes(struct inode *inode)
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{
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struct rpc_pipe *pipe = RPC_I(inode)->pipe;
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int need_release;
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LIST_HEAD(free_list);
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mutex_lock(&inode->i_mutex);
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spin_lock(&pipe->lock);
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need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
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pipe->nreaders = 0;
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list_splice_init(&pipe->in_upcall, &free_list);
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list_splice_init(&pipe->pipe, &free_list);
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pipe->pipelen = 0;
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pipe->dentry = NULL;
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spin_unlock(&pipe->lock);
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rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
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pipe->nwriters = 0;
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if (need_release && pipe->ops->release_pipe)
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pipe->ops->release_pipe(inode);
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cancel_delayed_work_sync(&pipe->queue_timeout);
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rpc_inode_setowner(inode, NULL);
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RPC_I(inode)->pipe = NULL;
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mutex_unlock(&inode->i_mutex);
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}
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static struct inode *
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rpc_alloc_inode(struct super_block *sb)
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{
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struct rpc_inode *rpci;
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rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
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if (!rpci)
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return NULL;
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return &rpci->vfs_inode;
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}
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static void
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rpc_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
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}
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static void
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rpc_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, rpc_i_callback);
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}
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static int
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rpc_pipe_open(struct inode *inode, struct file *filp)
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{
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struct net *net = inode->i_sb->s_fs_info;
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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struct rpc_pipe *pipe;
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int first_open;
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int res = -ENXIO;
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mutex_lock(&inode->i_mutex);
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sn->gssd_running = 1;
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pipe = RPC_I(inode)->pipe;
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if (pipe == NULL)
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goto out;
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first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
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if (first_open && pipe->ops->open_pipe) {
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res = pipe->ops->open_pipe(inode);
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if (res)
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goto out;
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}
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if (filp->f_mode & FMODE_READ)
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pipe->nreaders++;
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if (filp->f_mode & FMODE_WRITE)
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pipe->nwriters++;
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res = 0;
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out:
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mutex_unlock(&inode->i_mutex);
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return res;
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}
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static int
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rpc_pipe_release(struct inode *inode, struct file *filp)
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{
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struct rpc_pipe *pipe;
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struct rpc_pipe_msg *msg;
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int last_close;
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mutex_lock(&inode->i_mutex);
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pipe = RPC_I(inode)->pipe;
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if (pipe == NULL)
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goto out;
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msg = filp->private_data;
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if (msg != NULL) {
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spin_lock(&pipe->lock);
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msg->errno = -EAGAIN;
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list_del_init(&msg->list);
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spin_unlock(&pipe->lock);
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pipe->ops->destroy_msg(msg);
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}
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if (filp->f_mode & FMODE_WRITE)
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pipe->nwriters --;
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if (filp->f_mode & FMODE_READ) {
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pipe->nreaders --;
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if (pipe->nreaders == 0) {
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LIST_HEAD(free_list);
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spin_lock(&pipe->lock);
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list_splice_init(&pipe->pipe, &free_list);
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pipe->pipelen = 0;
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spin_unlock(&pipe->lock);
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rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
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pipe->ops->destroy_msg, -EAGAIN);
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}
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}
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last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
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if (last_close && pipe->ops->release_pipe)
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pipe->ops->release_pipe(inode);
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out:
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mutex_unlock(&inode->i_mutex);
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return 0;
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}
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static ssize_t
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rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
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{
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struct inode *inode = file_inode(filp);
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struct rpc_pipe *pipe;
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struct rpc_pipe_msg *msg;
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int res = 0;
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mutex_lock(&inode->i_mutex);
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pipe = RPC_I(inode)->pipe;
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if (pipe == NULL) {
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res = -EPIPE;
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goto out_unlock;
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}
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msg = filp->private_data;
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if (msg == NULL) {
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spin_lock(&pipe->lock);
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if (!list_empty(&pipe->pipe)) {
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msg = list_entry(pipe->pipe.next,
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struct rpc_pipe_msg,
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list);
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list_move(&msg->list, &pipe->in_upcall);
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pipe->pipelen -= msg->len;
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filp->private_data = msg;
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msg->copied = 0;
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}
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spin_unlock(&pipe->lock);
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if (msg == NULL)
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goto out_unlock;
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}
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/* NOTE: it is up to the callback to update msg->copied */
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res = pipe->ops->upcall(filp, msg, buf, len);
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if (res < 0 || msg->len == msg->copied) {
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filp->private_data = NULL;
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spin_lock(&pipe->lock);
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list_del_init(&msg->list);
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spin_unlock(&pipe->lock);
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pipe->ops->destroy_msg(msg);
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}
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out_unlock:
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mutex_unlock(&inode->i_mutex);
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return res;
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}
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static ssize_t
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rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
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{
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struct inode *inode = file_inode(filp);
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int res;
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mutex_lock(&inode->i_mutex);
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res = -EPIPE;
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if (RPC_I(inode)->pipe != NULL)
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res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
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mutex_unlock(&inode->i_mutex);
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return res;
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}
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static unsigned int
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rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
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{
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struct inode *inode = file_inode(filp);
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struct rpc_inode *rpci = RPC_I(inode);
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unsigned int mask = POLLOUT | POLLWRNORM;
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poll_wait(filp, &rpci->waitq, wait);
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mutex_lock(&inode->i_mutex);
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if (rpci->pipe == NULL)
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mask |= POLLERR | POLLHUP;
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else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
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mask |= POLLIN | POLLRDNORM;
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mutex_unlock(&inode->i_mutex);
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return mask;
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}
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static long
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rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(filp);
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struct rpc_pipe *pipe;
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int len;
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switch (cmd) {
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case FIONREAD:
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mutex_lock(&inode->i_mutex);
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pipe = RPC_I(inode)->pipe;
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if (pipe == NULL) {
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mutex_unlock(&inode->i_mutex);
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return -EPIPE;
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}
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spin_lock(&pipe->lock);
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len = pipe->pipelen;
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if (filp->private_data) {
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struct rpc_pipe_msg *msg;
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msg = filp->private_data;
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len += msg->len - msg->copied;
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}
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spin_unlock(&pipe->lock);
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mutex_unlock(&inode->i_mutex);
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return put_user(len, (int __user *)arg);
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default:
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return -EINVAL;
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}
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}
|
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|
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static const struct file_operations rpc_pipe_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.read = rpc_pipe_read,
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.write = rpc_pipe_write,
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.poll = rpc_pipe_poll,
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.unlocked_ioctl = rpc_pipe_ioctl,
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.open = rpc_pipe_open,
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.release = rpc_pipe_release,
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};
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|
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static int
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rpc_show_info(struct seq_file *m, void *v)
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{
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struct rpc_clnt *clnt = m->private;
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|
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rcu_read_lock();
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seq_printf(m, "RPC server: %s\n",
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rcu_dereference(clnt->cl_xprt)->servername);
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seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
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clnt->cl_prog, clnt->cl_vers);
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seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
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seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
|
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seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
|
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rcu_read_unlock();
|
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return 0;
|
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}
|
|
|
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static int
|
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rpc_info_open(struct inode *inode, struct file *file)
|
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{
|
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struct rpc_clnt *clnt = NULL;
|
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int ret = single_open(file, rpc_show_info, NULL);
|
|
|
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if (!ret) {
|
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struct seq_file *m = file->private_data;
|
|
|
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spin_lock(&file->f_path.dentry->d_lock);
|
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if (!d_unhashed(file->f_path.dentry))
|
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clnt = RPC_I(inode)->private;
|
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if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
|
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spin_unlock(&file->f_path.dentry->d_lock);
|
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m->private = clnt;
|
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} else {
|
|
spin_unlock(&file->f_path.dentry->d_lock);
|
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single_release(inode, file);
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
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rpc_info_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m = file->private_data;
|
|
struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
|
|
|
|
if (clnt)
|
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rpc_release_client(clnt);
|
|
return single_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations rpc_info_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = rpc_info_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = rpc_info_release,
|
|
};
|
|
|
|
|
|
/*
|
|
* Description of fs contents.
|
|
*/
|
|
struct rpc_filelist {
|
|
const char *name;
|
|
const struct file_operations *i_fop;
|
|
umode_t mode;
|
|
};
|
|
|
|
static int rpc_delete_dentry(const struct dentry *dentry)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static const struct dentry_operations rpc_dentry_operations = {
|
|
.d_delete = rpc_delete_dentry,
|
|
};
|
|
|
|
/*
|
|
* Lookup the data. This is trivial - if the dentry didn't already
|
|
* exist, we know it is negative.
|
|
*/
|
|
static struct dentry *
|
|
rpc_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
d_add(dentry, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
static const struct inode_operations rpc_dir_inode_operations = {
|
|
.lookup = rpc_lookup,
|
|
};
|
|
|
|
static struct inode *
|
|
rpc_get_inode(struct super_block *sb, umode_t mode)
|
|
{
|
|
struct inode *inode = new_inode(sb);
|
|
if (!inode)
|
|
return NULL;
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = mode;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
switch (mode & S_IFMT) {
|
|
case S_IFDIR:
|
|
inode->i_fop = &simple_dir_operations;
|
|
inode->i_op = &rpc_dir_inode_operations;
|
|
inc_nlink(inode);
|
|
default:
|
|
break;
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode,
|
|
const struct file_operations *i_fop,
|
|
void *private)
|
|
{
|
|
struct inode *inode;
|
|
|
|
d_drop(dentry);
|
|
inode = rpc_get_inode(dir->i_sb, mode);
|
|
if (!inode)
|
|
goto out_err;
|
|
inode->i_ino = iunique(dir->i_sb, 100);
|
|
if (i_fop)
|
|
inode->i_fop = i_fop;
|
|
if (private)
|
|
rpc_inode_setowner(inode, private);
|
|
d_add(dentry, inode);
|
|
return 0;
|
|
out_err:
|
|
printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
|
|
__FILE__, __func__, dentry->d_name.name);
|
|
dput(dentry);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int __rpc_create(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode,
|
|
const struct file_operations *i_fop,
|
|
void *private)
|
|
{
|
|
int err;
|
|
|
|
err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
|
|
if (err)
|
|
return err;
|
|
fsnotify_create(dir, dentry);
|
|
return 0;
|
|
}
|
|
|
|
static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode,
|
|
const struct file_operations *i_fop,
|
|
void *private)
|
|
{
|
|
int err;
|
|
|
|
err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
|
|
if (err)
|
|
return err;
|
|
inc_nlink(dir);
|
|
fsnotify_mkdir(dir, dentry);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
init_pipe(struct rpc_pipe *pipe)
|
|
{
|
|
pipe->nreaders = 0;
|
|
pipe->nwriters = 0;
|
|
INIT_LIST_HEAD(&pipe->in_upcall);
|
|
INIT_LIST_HEAD(&pipe->in_downcall);
|
|
INIT_LIST_HEAD(&pipe->pipe);
|
|
pipe->pipelen = 0;
|
|
INIT_DELAYED_WORK(&pipe->queue_timeout,
|
|
rpc_timeout_upcall_queue);
|
|
pipe->ops = NULL;
|
|
spin_lock_init(&pipe->lock);
|
|
pipe->dentry = NULL;
|
|
}
|
|
|
|
void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
|
|
{
|
|
kfree(pipe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
|
|
|
|
struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
|
|
{
|
|
struct rpc_pipe *pipe;
|
|
|
|
pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
|
|
if (!pipe)
|
|
return ERR_PTR(-ENOMEM);
|
|
init_pipe(pipe);
|
|
pipe->ops = ops;
|
|
pipe->flags = flags;
|
|
return pipe;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
|
|
|
|
static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode,
|
|
const struct file_operations *i_fop,
|
|
void *private,
|
|
struct rpc_pipe *pipe)
|
|
{
|
|
struct rpc_inode *rpci;
|
|
int err;
|
|
|
|
err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
|
|
if (err)
|
|
return err;
|
|
rpci = RPC_I(dentry->d_inode);
|
|
rpci->private = private;
|
|
rpci->pipe = pipe;
|
|
fsnotify_create(dir, dentry);
|
|
return 0;
|
|
}
|
|
|
|
static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
|
|
dget(dentry);
|
|
ret = simple_rmdir(dir, dentry);
|
|
d_delete(dentry);
|
|
dput(dentry);
|
|
return ret;
|
|
}
|
|
|
|
int rpc_rmdir(struct dentry *dentry)
|
|
{
|
|
struct dentry *parent;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
parent = dget_parent(dentry);
|
|
dir = parent->d_inode;
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
error = __rpc_rmdir(dir, dentry);
|
|
mutex_unlock(&dir->i_mutex);
|
|
dput(parent);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_rmdir);
|
|
|
|
static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
|
|
dget(dentry);
|
|
ret = simple_unlink(dir, dentry);
|
|
d_delete(dentry);
|
|
dput(dentry);
|
|
return ret;
|
|
}
|
|
|
|
static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
rpc_close_pipes(inode);
|
|
return __rpc_unlink(dir, dentry);
|
|
}
|
|
|
|
static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
|
|
struct qstr *name)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
dentry = d_lookup(parent, name);
|
|
if (!dentry) {
|
|
dentry = d_alloc(parent, name);
|
|
if (!dentry)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
if (dentry->d_inode == NULL)
|
|
return dentry;
|
|
dput(dentry);
|
|
return ERR_PTR(-EEXIST);
|
|
}
|
|
|
|
/*
|
|
* FIXME: This probably has races.
|
|
*/
|
|
static void __rpc_depopulate(struct dentry *parent,
|
|
const struct rpc_filelist *files,
|
|
int start, int eof)
|
|
{
|
|
struct inode *dir = parent->d_inode;
|
|
struct dentry *dentry;
|
|
struct qstr name;
|
|
int i;
|
|
|
|
for (i = start; i < eof; i++) {
|
|
name.name = files[i].name;
|
|
name.len = strlen(files[i].name);
|
|
name.hash = full_name_hash(name.name, name.len);
|
|
dentry = d_lookup(parent, &name);
|
|
|
|
if (dentry == NULL)
|
|
continue;
|
|
if (dentry->d_inode == NULL)
|
|
goto next;
|
|
switch (dentry->d_inode->i_mode & S_IFMT) {
|
|
default:
|
|
BUG();
|
|
case S_IFREG:
|
|
__rpc_unlink(dir, dentry);
|
|
break;
|
|
case S_IFDIR:
|
|
__rpc_rmdir(dir, dentry);
|
|
}
|
|
next:
|
|
dput(dentry);
|
|
}
|
|
}
|
|
|
|
static void rpc_depopulate(struct dentry *parent,
|
|
const struct rpc_filelist *files,
|
|
int start, int eof)
|
|
{
|
|
struct inode *dir = parent->d_inode;
|
|
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
|
|
__rpc_depopulate(parent, files, start, eof);
|
|
mutex_unlock(&dir->i_mutex);
|
|
}
|
|
|
|
static int rpc_populate(struct dentry *parent,
|
|
const struct rpc_filelist *files,
|
|
int start, int eof,
|
|
void *private)
|
|
{
|
|
struct inode *dir = parent->d_inode;
|
|
struct dentry *dentry;
|
|
int i, err;
|
|
|
|
mutex_lock(&dir->i_mutex);
|
|
for (i = start; i < eof; i++) {
|
|
struct qstr q;
|
|
|
|
q.name = files[i].name;
|
|
q.len = strlen(files[i].name);
|
|
q.hash = full_name_hash(q.name, q.len);
|
|
dentry = __rpc_lookup_create_exclusive(parent, &q);
|
|
err = PTR_ERR(dentry);
|
|
if (IS_ERR(dentry))
|
|
goto out_bad;
|
|
switch (files[i].mode & S_IFMT) {
|
|
default:
|
|
BUG();
|
|
case S_IFREG:
|
|
err = __rpc_create(dir, dentry,
|
|
files[i].mode,
|
|
files[i].i_fop,
|
|
private);
|
|
break;
|
|
case S_IFDIR:
|
|
err = __rpc_mkdir(dir, dentry,
|
|
files[i].mode,
|
|
NULL,
|
|
private);
|
|
}
|
|
if (err != 0)
|
|
goto out_bad;
|
|
}
|
|
mutex_unlock(&dir->i_mutex);
|
|
return 0;
|
|
out_bad:
|
|
__rpc_depopulate(parent, files, start, eof);
|
|
mutex_unlock(&dir->i_mutex);
|
|
printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
|
|
__FILE__, __func__, parent->d_name.name);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *rpc_mkdir_populate(struct dentry *parent,
|
|
struct qstr *name, umode_t mode, void *private,
|
|
int (*populate)(struct dentry *, void *), void *args_populate)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir = parent->d_inode;
|
|
int error;
|
|
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
dentry = __rpc_lookup_create_exclusive(parent, name);
|
|
if (IS_ERR(dentry))
|
|
goto out;
|
|
error = __rpc_mkdir(dir, dentry, mode, NULL, private);
|
|
if (error != 0)
|
|
goto out_err;
|
|
if (populate != NULL) {
|
|
error = populate(dentry, args_populate);
|
|
if (error)
|
|
goto err_rmdir;
|
|
}
|
|
out:
|
|
mutex_unlock(&dir->i_mutex);
|
|
return dentry;
|
|
err_rmdir:
|
|
__rpc_rmdir(dir, dentry);
|
|
out_err:
|
|
dentry = ERR_PTR(error);
|
|
goto out;
|
|
}
|
|
|
|
static int rpc_rmdir_depopulate(struct dentry *dentry,
|
|
void (*depopulate)(struct dentry *))
|
|
{
|
|
struct dentry *parent;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
parent = dget_parent(dentry);
|
|
dir = parent->d_inode;
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
if (depopulate != NULL)
|
|
depopulate(dentry);
|
|
error = __rpc_rmdir(dir, dentry);
|
|
mutex_unlock(&dir->i_mutex);
|
|
dput(parent);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
|
|
* @parent: dentry of directory to create new "pipe" in
|
|
* @name: name of pipe
|
|
* @private: private data to associate with the pipe, for the caller's use
|
|
* @pipe: &rpc_pipe containing input parameters
|
|
*
|
|
* Data is made available for userspace to read by calls to
|
|
* rpc_queue_upcall(). The actual reads will result in calls to
|
|
* @ops->upcall, which will be called with the file pointer,
|
|
* message, and userspace buffer to copy to.
|
|
*
|
|
* Writes can come at any time, and do not necessarily have to be
|
|
* responses to upcalls. They will result in calls to @msg->downcall.
|
|
*
|
|
* The @private argument passed here will be available to all these methods
|
|
* from the file pointer, via RPC_I(file_inode(file))->private.
|
|
*/
|
|
struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
|
|
void *private, struct rpc_pipe *pipe)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir = parent->d_inode;
|
|
umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
|
|
struct qstr q;
|
|
int err;
|
|
|
|
if (pipe->ops->upcall == NULL)
|
|
umode &= ~S_IRUGO;
|
|
if (pipe->ops->downcall == NULL)
|
|
umode &= ~S_IWUGO;
|
|
|
|
q.name = name;
|
|
q.len = strlen(name);
|
|
q.hash = full_name_hash(q.name, q.len),
|
|
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
dentry = __rpc_lookup_create_exclusive(parent, &q);
|
|
if (IS_ERR(dentry))
|
|
goto out;
|
|
err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
|
|
private, pipe);
|
|
if (err)
|
|
goto out_err;
|
|
out:
|
|
mutex_unlock(&dir->i_mutex);
|
|
return dentry;
|
|
out_err:
|
|
dentry = ERR_PTR(err);
|
|
printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
|
|
__FILE__, __func__, parent->d_name.name, name,
|
|
err);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
|
|
|
|
/**
|
|
* rpc_unlink - remove a pipe
|
|
* @dentry: dentry for the pipe, as returned from rpc_mkpipe
|
|
*
|
|
* After this call, lookups will no longer find the pipe, and any
|
|
* attempts to read or write using preexisting opens of the pipe will
|
|
* return -EPIPE.
|
|
*/
|
|
int
|
|
rpc_unlink(struct dentry *dentry)
|
|
{
|
|
struct dentry *parent;
|
|
struct inode *dir;
|
|
int error = 0;
|
|
|
|
parent = dget_parent(dentry);
|
|
dir = parent->d_inode;
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
error = __rpc_rmpipe(dir, dentry);
|
|
mutex_unlock(&dir->i_mutex);
|
|
dput(parent);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_unlink);
|
|
|
|
enum {
|
|
RPCAUTH_info,
|
|
RPCAUTH_EOF
|
|
};
|
|
|
|
static const struct rpc_filelist authfiles[] = {
|
|
[RPCAUTH_info] = {
|
|
.name = "info",
|
|
.i_fop = &rpc_info_operations,
|
|
.mode = S_IFREG | S_IRUSR,
|
|
},
|
|
};
|
|
|
|
static int rpc_clntdir_populate(struct dentry *dentry, void *private)
|
|
{
|
|
return rpc_populate(dentry,
|
|
authfiles, RPCAUTH_info, RPCAUTH_EOF,
|
|
private);
|
|
}
|
|
|
|
static void rpc_clntdir_depopulate(struct dentry *dentry)
|
|
{
|
|
rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
|
|
}
|
|
|
|
/**
|
|
* rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
|
|
* @dentry: dentry from the rpc_pipefs root to the new directory
|
|
* @name: &struct qstr for the name
|
|
* @rpc_client: rpc client to associate with this directory
|
|
*
|
|
* This creates a directory at the given @path associated with
|
|
* @rpc_clnt, which will contain a file named "info" with some basic
|
|
* information about the client, together with any "pipes" that may
|
|
* later be created using rpc_mkpipe().
|
|
*/
|
|
struct dentry *rpc_create_client_dir(struct dentry *dentry,
|
|
struct qstr *name,
|
|
struct rpc_clnt *rpc_client)
|
|
{
|
|
return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
|
|
rpc_clntdir_populate, rpc_client);
|
|
}
|
|
|
|
/**
|
|
* rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
|
|
* @dentry: dentry for the pipe
|
|
*/
|
|
int rpc_remove_client_dir(struct dentry *dentry)
|
|
{
|
|
return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
|
|
}
|
|
|
|
static const struct rpc_filelist cache_pipefs_files[3] = {
|
|
[0] = {
|
|
.name = "channel",
|
|
.i_fop = &cache_file_operations_pipefs,
|
|
.mode = S_IFREG|S_IRUSR|S_IWUSR,
|
|
},
|
|
[1] = {
|
|
.name = "content",
|
|
.i_fop = &content_file_operations_pipefs,
|
|
.mode = S_IFREG|S_IRUSR,
|
|
},
|
|
[2] = {
|
|
.name = "flush",
|
|
.i_fop = &cache_flush_operations_pipefs,
|
|
.mode = S_IFREG|S_IRUSR|S_IWUSR,
|
|
},
|
|
};
|
|
|
|
static int rpc_cachedir_populate(struct dentry *dentry, void *private)
|
|
{
|
|
return rpc_populate(dentry,
|
|
cache_pipefs_files, 0, 3,
|
|
private);
|
|
}
|
|
|
|
static void rpc_cachedir_depopulate(struct dentry *dentry)
|
|
{
|
|
rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
|
|
}
|
|
|
|
struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
|
|
umode_t umode, struct cache_detail *cd)
|
|
{
|
|
return rpc_mkdir_populate(parent, name, umode, NULL,
|
|
rpc_cachedir_populate, cd);
|
|
}
|
|
|
|
void rpc_remove_cache_dir(struct dentry *dentry)
|
|
{
|
|
rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
|
|
}
|
|
|
|
/*
|
|
* populate the filesystem
|
|
*/
|
|
static const struct super_operations s_ops = {
|
|
.alloc_inode = rpc_alloc_inode,
|
|
.destroy_inode = rpc_destroy_inode,
|
|
.statfs = simple_statfs,
|
|
};
|
|
|
|
#define RPCAUTH_GSSMAGIC 0x67596969
|
|
|
|
/*
|
|
* We have a single directory with 1 node in it.
|
|
*/
|
|
enum {
|
|
RPCAUTH_lockd,
|
|
RPCAUTH_mount,
|
|
RPCAUTH_nfs,
|
|
RPCAUTH_portmap,
|
|
RPCAUTH_statd,
|
|
RPCAUTH_nfsd4_cb,
|
|
RPCAUTH_cache,
|
|
RPCAUTH_nfsd,
|
|
RPCAUTH_RootEOF
|
|
};
|
|
|
|
static const struct rpc_filelist files[] = {
|
|
[RPCAUTH_lockd] = {
|
|
.name = "lockd",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_mount] = {
|
|
.name = "mount",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_nfs] = {
|
|
.name = "nfs",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_portmap] = {
|
|
.name = "portmap",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_statd] = {
|
|
.name = "statd",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_nfsd4_cb] = {
|
|
.name = "nfsd4_cb",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_cache] = {
|
|
.name = "cache",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
[RPCAUTH_nfsd] = {
|
|
.name = "nfsd",
|
|
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* This call can be used only in RPC pipefs mount notification hooks.
|
|
*/
|
|
struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
|
|
const unsigned char *dir_name)
|
|
{
|
|
struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
|
|
|
|
dir.hash = full_name_hash(dir.name, dir.len);
|
|
return d_lookup(sb->s_root, &dir);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
|
|
|
|
void rpc_pipefs_init_net(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
mutex_init(&sn->pipefs_sb_lock);
|
|
sn->gssd_running = 1;
|
|
sn->pipe_version = -1;
|
|
}
|
|
|
|
/*
|
|
* This call will be used for per network namespace operations calls.
|
|
* Note: Function will be returned with pipefs_sb_lock taken if superblock was
|
|
* found. This lock have to be released by rpc_put_sb_net() when all operations
|
|
* will be completed.
|
|
*/
|
|
struct super_block *rpc_get_sb_net(const struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
mutex_lock(&sn->pipefs_sb_lock);
|
|
if (sn->pipefs_sb)
|
|
return sn->pipefs_sb;
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_get_sb_net);
|
|
|
|
void rpc_put_sb_net(const struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
WARN_ON(sn->pipefs_sb == NULL);
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_put_sb_net);
|
|
|
|
static int
|
|
rpc_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *inode;
|
|
struct dentry *root;
|
|
struct net *net = data;
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
int err;
|
|
|
|
sb->s_blocksize = PAGE_CACHE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
|
sb->s_magic = RPCAUTH_GSSMAGIC;
|
|
sb->s_op = &s_ops;
|
|
sb->s_d_op = &rpc_dentry_operations;
|
|
sb->s_time_gran = 1;
|
|
|
|
inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
|
|
sb->s_root = root = d_make_root(inode);
|
|
if (!root)
|
|
return -ENOMEM;
|
|
if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
|
|
return -ENOMEM;
|
|
dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n",
|
|
net, NET_NAME(net));
|
|
mutex_lock(&sn->pipefs_sb_lock);
|
|
sn->pipefs_sb = sb;
|
|
err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
|
|
RPC_PIPEFS_MOUNT,
|
|
sb);
|
|
if (err)
|
|
goto err_depopulate;
|
|
sb->s_fs_info = get_net(net);
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
return 0;
|
|
|
|
err_depopulate:
|
|
blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
|
|
RPC_PIPEFS_UMOUNT,
|
|
sb);
|
|
sn->pipefs_sb = NULL;
|
|
__rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *
|
|
rpc_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super);
|
|
}
|
|
|
|
static void rpc_kill_sb(struct super_block *sb)
|
|
{
|
|
struct net *net = sb->s_fs_info;
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
mutex_lock(&sn->pipefs_sb_lock);
|
|
if (sn->pipefs_sb != sb) {
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
goto out;
|
|
}
|
|
sn->pipefs_sb = NULL;
|
|
dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n",
|
|
net, NET_NAME(net));
|
|
blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
|
|
RPC_PIPEFS_UMOUNT,
|
|
sb);
|
|
mutex_unlock(&sn->pipefs_sb_lock);
|
|
put_net(net);
|
|
out:
|
|
kill_litter_super(sb);
|
|
}
|
|
|
|
static struct file_system_type rpc_pipe_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "rpc_pipefs",
|
|
.mount = rpc_mount,
|
|
.kill_sb = rpc_kill_sb,
|
|
};
|
|
MODULE_ALIAS_FS("rpc_pipefs");
|
|
MODULE_ALIAS("rpc_pipefs");
|
|
|
|
static void
|
|
init_once(void *foo)
|
|
{
|
|
struct rpc_inode *rpci = (struct rpc_inode *) foo;
|
|
|
|
inode_init_once(&rpci->vfs_inode);
|
|
rpci->private = NULL;
|
|
rpci->pipe = NULL;
|
|
init_waitqueue_head(&rpci->waitq);
|
|
}
|
|
|
|
int register_rpc_pipefs(void)
|
|
{
|
|
int err;
|
|
|
|
rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
|
|
sizeof(struct rpc_inode),
|
|
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once);
|
|
if (!rpc_inode_cachep)
|
|
return -ENOMEM;
|
|
err = rpc_clients_notifier_register();
|
|
if (err)
|
|
goto err_notifier;
|
|
err = register_filesystem(&rpc_pipe_fs_type);
|
|
if (err)
|
|
goto err_register;
|
|
return 0;
|
|
|
|
err_register:
|
|
rpc_clients_notifier_unregister();
|
|
err_notifier:
|
|
kmem_cache_destroy(rpc_inode_cachep);
|
|
return err;
|
|
}
|
|
|
|
void unregister_rpc_pipefs(void)
|
|
{
|
|
rpc_clients_notifier_unregister();
|
|
kmem_cache_destroy(rpc_inode_cachep);
|
|
unregister_filesystem(&rpc_pipe_fs_type);
|
|
}
|