![Trond Myklebust](/assets/img/avatar_default.png)
Conflicts: fs/nfs/inode.c fs/super.c Fix conflicts between patch 'NFS: Split fs/nfs/inode.c' and patch 'VFS: Permit filesystem to override root dentry on mount'
871 lines
19 KiB
C
871 lines
19 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/config.h>
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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/dnotify.h>
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#include <linux/kernel.h>
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#include <asm/ioctls.h>
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#include <linux/fs.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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static struct vfsmount *rpc_mount __read_mostly;
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static int rpc_mount_count;
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static struct file_system_type rpc_pipe_fs_type;
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static kmem_cache_t *rpc_inode_cachep __read_mostly;
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#define RPC_UPCALL_TIMEOUT (30*HZ)
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static void rpc_purge_list(struct rpc_inode *rpci, 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(&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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wake_up(&rpci->waitq);
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}
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static void
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rpc_timeout_upcall_queue(void *data)
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{
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LIST_HEAD(free_list);
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struct rpc_inode *rpci = (struct rpc_inode *)data;
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struct inode *inode = &rpci->vfs_inode;
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void (*destroy_msg)(struct rpc_pipe_msg *);
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spin_lock(&inode->i_lock);
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if (rpci->ops == NULL) {
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spin_unlock(&inode->i_lock);
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return;
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}
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destroy_msg = rpci->ops->destroy_msg;
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if (rpci->nreaders == 0) {
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list_splice_init(&rpci->pipe, &free_list);
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rpci->pipelen = 0;
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}
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spin_unlock(&inode->i_lock);
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rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
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}
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int
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rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
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{
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struct rpc_inode *rpci = RPC_I(inode);
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int res = -EPIPE;
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spin_lock(&inode->i_lock);
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if (rpci->ops == NULL)
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goto out;
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if (rpci->nreaders) {
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list_add_tail(&msg->list, &rpci->pipe);
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rpci->pipelen += msg->len;
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res = 0;
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} else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
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if (list_empty(&rpci->pipe))
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queue_delayed_work(rpciod_workqueue,
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&rpci->queue_timeout,
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RPC_UPCALL_TIMEOUT);
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list_add_tail(&msg->list, &rpci->pipe);
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rpci->pipelen += msg->len;
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res = 0;
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}
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out:
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spin_unlock(&inode->i_lock);
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wake_up(&rpci->waitq);
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return res;
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}
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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_inode *rpci = RPC_I(inode);
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struct rpc_pipe_ops *ops;
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mutex_lock(&inode->i_mutex);
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ops = rpci->ops;
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if (ops != NULL) {
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LIST_HEAD(free_list);
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spin_lock(&inode->i_lock);
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rpci->nreaders = 0;
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list_splice_init(&rpci->in_upcall, &free_list);
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list_splice_init(&rpci->pipe, &free_list);
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rpci->pipelen = 0;
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rpci->ops = NULL;
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spin_unlock(&inode->i_lock);
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rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
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rpci->nwriters = 0;
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if (ops->release_pipe)
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ops->release_pipe(inode);
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cancel_delayed_work(&rpci->queue_timeout);
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flush_workqueue(rpciod_workqueue);
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}
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rpc_inode_setowner(inode, 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, SLAB_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_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
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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 rpc_inode *rpci = RPC_I(inode);
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int res = -ENXIO;
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mutex_lock(&inode->i_mutex);
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if (rpci->ops != NULL) {
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if (filp->f_mode & FMODE_READ)
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rpci->nreaders ++;
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if (filp->f_mode & FMODE_WRITE)
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rpci->nwriters ++;
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res = 0;
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}
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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_inode *rpci = RPC_I(inode);
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struct rpc_pipe_msg *msg;
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mutex_lock(&inode->i_mutex);
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if (rpci->ops == NULL)
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goto out;
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msg = (struct rpc_pipe_msg *)filp->private_data;
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if (msg != NULL) {
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spin_lock(&inode->i_lock);
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msg->errno = -EAGAIN;
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list_del(&msg->list);
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spin_unlock(&inode->i_lock);
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rpci->ops->destroy_msg(msg);
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}
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if (filp->f_mode & FMODE_WRITE)
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rpci->nwriters --;
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if (filp->f_mode & FMODE_READ) {
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rpci->nreaders --;
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if (rpci->nreaders == 0) {
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LIST_HEAD(free_list);
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spin_lock(&inode->i_lock);
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list_splice_init(&rpci->pipe, &free_list);
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rpci->pipelen = 0;
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spin_unlock(&inode->i_lock);
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rpc_purge_list(rpci, &free_list,
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rpci->ops->destroy_msg, -EAGAIN);
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}
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}
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if (rpci->ops->release_pipe)
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rpci->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 = filp->f_dentry->d_inode;
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struct rpc_inode *rpci = RPC_I(inode);
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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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if (rpci->ops == 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(&inode->i_lock);
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if (!list_empty(&rpci->pipe)) {
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msg = list_entry(rpci->pipe.next,
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struct rpc_pipe_msg,
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list);
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list_move(&msg->list, &rpci->in_upcall);
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rpci->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(&inode->i_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 = rpci->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(&inode->i_lock);
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list_del(&msg->list);
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spin_unlock(&inode->i_lock);
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rpci->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 = filp->f_dentry->d_inode;
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struct rpc_inode *rpci = RPC_I(inode);
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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 (rpci->ops != NULL)
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res = rpci->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 rpc_inode *rpci;
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unsigned int mask = 0;
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rpci = RPC_I(filp->f_dentry->d_inode);
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poll_wait(filp, &rpci->waitq, wait);
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mask = POLLOUT | POLLWRNORM;
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if (rpci->ops == NULL)
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mask |= POLLERR | POLLHUP;
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if (!list_empty(&rpci->pipe))
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mask |= POLLIN | POLLRDNORM;
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return mask;
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}
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static int
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rpc_pipe_ioctl(struct inode *ino, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
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int len;
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switch (cmd) {
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case FIONREAD:
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if (rpci->ops == NULL)
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return -EPIPE;
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len = rpci->pipelen;
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if (filp->private_data) {
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struct rpc_pipe_msg *msg;
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msg = (struct rpc_pipe_msg *)filp->private_data;
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len += msg->len - msg->copied;
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}
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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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static 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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.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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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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seq_printf(m, "RPC server: %s\n", clnt->cl_server);
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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: %u.%u.%u.%u\n",
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NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr));
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seq_printf(m, "protocol: %s\n",
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clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
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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;
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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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mutex_lock(&inode->i_mutex);
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clnt = RPC_I(inode)->private;
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if (clnt) {
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atomic_inc(&clnt->cl_users);
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m->private = clnt;
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} else {
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single_release(inode, file);
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ret = -EINVAL;
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}
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mutex_unlock(&inode->i_mutex);
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}
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return ret;
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}
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static int
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rpc_info_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
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if (clnt)
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rpc_release_client(clnt);
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return single_release(inode, file);
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}
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static struct file_operations rpc_info_operations = {
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.owner = THIS_MODULE,
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.open = rpc_info_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = rpc_info_release,
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};
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/*
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* We have a single directory with 1 node in it.
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*/
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enum {
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RPCAUTH_Root = 1,
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RPCAUTH_lockd,
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RPCAUTH_mount,
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RPCAUTH_nfs,
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RPCAUTH_portmap,
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RPCAUTH_statd,
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RPCAUTH_RootEOF
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};
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/*
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* Description of fs contents.
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*/
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struct rpc_filelist {
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char *name;
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const struct file_operations *i_fop;
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int mode;
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};
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static struct rpc_filelist files[] = {
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[RPCAUTH_lockd] = {
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.name = "lockd",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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},
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[RPCAUTH_mount] = {
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.name = "mount",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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},
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[RPCAUTH_nfs] = {
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.name = "nfs",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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},
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[RPCAUTH_portmap] = {
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.name = "portmap",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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},
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[RPCAUTH_statd] = {
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.name = "statd",
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.mode = S_IFDIR | S_IRUGO | S_IXUGO,
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},
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};
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enum {
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RPCAUTH_info = 2,
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RPCAUTH_EOF
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};
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static struct rpc_filelist authfiles[] = {
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[RPCAUTH_info] = {
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.name = "info",
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.i_fop = &rpc_info_operations,
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.mode = S_IFREG | S_IRUSR,
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},
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};
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struct vfsmount *rpc_get_mount(void)
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{
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int err;
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err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count);
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if (err != 0)
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return ERR_PTR(err);
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return rpc_mount;
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}
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void rpc_put_mount(void)
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{
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simple_release_fs(&rpc_mount, &rpc_mount_count);
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}
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static int
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rpc_lookup_parent(char *path, struct nameidata *nd)
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{
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if (path[0] == '\0')
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return -ENOENT;
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nd->mnt = rpc_get_mount();
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if (IS_ERR(nd->mnt)) {
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printk(KERN_WARNING "%s: %s failed to mount "
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"pseudofilesystem \n", __FILE__, __FUNCTION__);
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return PTR_ERR(nd->mnt);
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}
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mntget(nd->mnt);
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nd->dentry = dget(rpc_mount->mnt_root);
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nd->last_type = LAST_ROOT;
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nd->flags = LOOKUP_PARENT;
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nd->depth = 0;
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if (path_walk(path, nd)) {
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printk(KERN_WARNING "%s: %s failed to find path %s\n",
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__FILE__, __FUNCTION__, path);
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rpc_put_mount();
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return -ENOENT;
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}
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return 0;
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}
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static void
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rpc_release_path(struct nameidata *nd)
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{
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path_release(nd);
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rpc_put_mount();
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}
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static struct inode *
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rpc_get_inode(struct super_block *sb, int mode)
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{
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struct inode *inode = new_inode(sb);
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if (!inode)
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return NULL;
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inode->i_mode = mode;
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inode->i_uid = inode->i_gid = 0;
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inode->i_blksize = PAGE_CACHE_SIZE;
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inode->i_blocks = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch(mode & S_IFMT) {
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case S_IFDIR:
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inode->i_fop = &simple_dir_operations;
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inode->i_op = &simple_dir_inode_operations;
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inode->i_nlink++;
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default:
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break;
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}
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return inode;
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}
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/*
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* FIXME: This probably has races.
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*/
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static void
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rpc_depopulate(struct dentry *parent)
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{
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struct inode *dir = parent->d_inode;
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struct list_head *pos, *next;
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struct dentry *dentry, *dvec[10];
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int n = 0;
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mutex_lock(&dir->i_mutex);
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repeat:
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spin_lock(&dcache_lock);
|
|
list_for_each_safe(pos, next, &parent->d_subdirs) {
|
|
dentry = list_entry(pos, struct dentry, d_u.d_child);
|
|
spin_lock(&dentry->d_lock);
|
|
if (!d_unhashed(dentry)) {
|
|
dget_locked(dentry);
|
|
__d_drop(dentry);
|
|
spin_unlock(&dentry->d_lock);
|
|
dvec[n++] = dentry;
|
|
if (n == ARRAY_SIZE(dvec))
|
|
break;
|
|
} else
|
|
spin_unlock(&dentry->d_lock);
|
|
}
|
|
spin_unlock(&dcache_lock);
|
|
if (n) {
|
|
do {
|
|
dentry = dvec[--n];
|
|
if (dentry->d_inode) {
|
|
rpc_close_pipes(dentry->d_inode);
|
|
simple_unlink(dir, dentry);
|
|
}
|
|
dput(dentry);
|
|
} while (n);
|
|
goto repeat;
|
|
}
|
|
mutex_unlock(&dir->i_mutex);
|
|
}
|
|
|
|
static int
|
|
rpc_populate(struct dentry *parent,
|
|
struct rpc_filelist *files,
|
|
int start, int eof)
|
|
{
|
|
struct inode *inode, *dir = parent->d_inode;
|
|
void *private = RPC_I(dir)->private;
|
|
struct dentry *dentry;
|
|
int mode, i;
|
|
|
|
mutex_lock(&dir->i_mutex);
|
|
for (i = start; i < eof; i++) {
|
|
dentry = d_alloc_name(parent, files[i].name);
|
|
if (!dentry)
|
|
goto out_bad;
|
|
mode = files[i].mode;
|
|
inode = rpc_get_inode(dir->i_sb, mode);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
goto out_bad;
|
|
}
|
|
inode->i_ino = i;
|
|
if (files[i].i_fop)
|
|
inode->i_fop = files[i].i_fop;
|
|
if (private)
|
|
rpc_inode_setowner(inode, private);
|
|
if (S_ISDIR(mode))
|
|
dir->i_nlink++;
|
|
d_add(dentry, inode);
|
|
}
|
|
mutex_unlock(&dir->i_mutex);
|
|
return 0;
|
|
out_bad:
|
|
mutex_unlock(&dir->i_mutex);
|
|
printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
|
|
__FILE__, __FUNCTION__, parent->d_name.name);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int
|
|
__rpc_mkdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
|
|
if (!inode)
|
|
goto out_err;
|
|
inode->i_ino = iunique(dir->i_sb, 100);
|
|
d_instantiate(dentry, inode);
|
|
dir->i_nlink++;
|
|
inode_dir_notify(dir, DN_CREATE);
|
|
return 0;
|
|
out_err:
|
|
printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
|
|
__FILE__, __FUNCTION__, dentry->d_name.name);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int
|
|
__rpc_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int error;
|
|
|
|
shrink_dcache_parent(dentry);
|
|
if (dentry->d_inode)
|
|
rpc_close_pipes(dentry->d_inode);
|
|
if ((error = simple_rmdir(dir, dentry)) != 0)
|
|
return error;
|
|
if (!error) {
|
|
inode_dir_notify(dir, DN_DELETE);
|
|
d_drop(dentry);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *
|
|
rpc_lookup_negative(char *path, struct nameidata *nd)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
if ((error = rpc_lookup_parent(path, nd)) != 0)
|
|
return ERR_PTR(error);
|
|
dir = nd->dentry->d_inode;
|
|
mutex_lock(&dir->i_mutex);
|
|
dentry = lookup_one_len(nd->last.name, nd->dentry, nd->last.len);
|
|
if (IS_ERR(dentry))
|
|
goto out_err;
|
|
if (dentry->d_inode) {
|
|
dput(dentry);
|
|
dentry = ERR_PTR(-EEXIST);
|
|
goto out_err;
|
|
}
|
|
return dentry;
|
|
out_err:
|
|
mutex_unlock(&dir->i_mutex);
|
|
rpc_release_path(nd);
|
|
return dentry;
|
|
}
|
|
|
|
|
|
struct dentry *
|
|
rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
|
|
{
|
|
struct nameidata nd;
|
|
struct dentry *dentry;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
dentry = rpc_lookup_negative(path, &nd);
|
|
if (IS_ERR(dentry))
|
|
return dentry;
|
|
dir = nd.dentry->d_inode;
|
|
if ((error = __rpc_mkdir(dir, dentry)) != 0)
|
|
goto err_dput;
|
|
RPC_I(dentry->d_inode)->private = rpc_client;
|
|
error = rpc_populate(dentry, authfiles,
|
|
RPCAUTH_info, RPCAUTH_EOF);
|
|
if (error)
|
|
goto err_depopulate;
|
|
out:
|
|
mutex_unlock(&dir->i_mutex);
|
|
rpc_release_path(&nd);
|
|
return dget(dentry);
|
|
err_depopulate:
|
|
rpc_depopulate(dentry);
|
|
__rpc_rmdir(dir, dentry);
|
|
err_dput:
|
|
dput(dentry);
|
|
printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
|
|
__FILE__, __FUNCTION__, path, error);
|
|
dentry = ERR_PTR(error);
|
|
goto out;
|
|
}
|
|
|
|
int
|
|
rpc_rmdir(char *path)
|
|
{
|
|
struct nameidata nd;
|
|
struct dentry *dentry;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
if ((error = rpc_lookup_parent(path, &nd)) != 0)
|
|
return error;
|
|
dir = nd.dentry->d_inode;
|
|
mutex_lock(&dir->i_mutex);
|
|
dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len);
|
|
if (IS_ERR(dentry)) {
|
|
error = PTR_ERR(dentry);
|
|
goto out_release;
|
|
}
|
|
rpc_depopulate(dentry);
|
|
error = __rpc_rmdir(dir, dentry);
|
|
dput(dentry);
|
|
out_release:
|
|
mutex_unlock(&dir->i_mutex);
|
|
rpc_release_path(&nd);
|
|
return error;
|
|
}
|
|
|
|
struct dentry *
|
|
rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags)
|
|
{
|
|
struct nameidata nd;
|
|
struct dentry *dentry;
|
|
struct inode *dir, *inode;
|
|
struct rpc_inode *rpci;
|
|
|
|
dentry = rpc_lookup_negative(path, &nd);
|
|
if (IS_ERR(dentry))
|
|
return dentry;
|
|
dir = nd.dentry->d_inode;
|
|
inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR);
|
|
if (!inode)
|
|
goto err_dput;
|
|
inode->i_ino = iunique(dir->i_sb, 100);
|
|
inode->i_fop = &rpc_pipe_fops;
|
|
d_instantiate(dentry, inode);
|
|
rpci = RPC_I(inode);
|
|
rpci->private = private;
|
|
rpci->flags = flags;
|
|
rpci->ops = ops;
|
|
inode_dir_notify(dir, DN_CREATE);
|
|
out:
|
|
mutex_unlock(&dir->i_mutex);
|
|
rpc_release_path(&nd);
|
|
return dget(dentry);
|
|
err_dput:
|
|
dput(dentry);
|
|
dentry = ERR_PTR(-ENOMEM);
|
|
printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n",
|
|
__FILE__, __FUNCTION__, path, -ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
int
|
|
rpc_unlink(char *path)
|
|
{
|
|
struct nameidata nd;
|
|
struct dentry *dentry;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
if ((error = rpc_lookup_parent(path, &nd)) != 0)
|
|
return error;
|
|
dir = nd.dentry->d_inode;
|
|
mutex_lock(&dir->i_mutex);
|
|
dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len);
|
|
if (IS_ERR(dentry)) {
|
|
error = PTR_ERR(dentry);
|
|
goto out_release;
|
|
}
|
|
d_drop(dentry);
|
|
if (dentry->d_inode) {
|
|
rpc_close_pipes(dentry->d_inode);
|
|
error = simple_unlink(dir, dentry);
|
|
}
|
|
dput(dentry);
|
|
inode_dir_notify(dir, DN_DELETE);
|
|
out_release:
|
|
mutex_unlock(&dir->i_mutex);
|
|
rpc_release_path(&nd);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* populate the filesystem
|
|
*/
|
|
static struct super_operations s_ops = {
|
|
.alloc_inode = rpc_alloc_inode,
|
|
.destroy_inode = rpc_destroy_inode,
|
|
.statfs = simple_statfs,
|
|
};
|
|
|
|
#define RPCAUTH_GSSMAGIC 0x67596969
|
|
|
|
static int
|
|
rpc_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *inode;
|
|
struct dentry *root;
|
|
|
|
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_time_gran = 1;
|
|
|
|
inode = rpc_get_inode(sb, S_IFDIR | 0755);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
root = d_alloc_root(inode);
|
|
if (!root) {
|
|
iput(inode);
|
|
return -ENOMEM;
|
|
}
|
|
if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
|
|
goto out;
|
|
sb->s_root = root;
|
|
return 0;
|
|
out:
|
|
d_genocide(root);
|
|
dput(root);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int
|
|
rpc_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type rpc_pipe_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "rpc_pipefs",
|
|
.get_sb = rpc_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static void
|
|
init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
|
|
{
|
|
struct rpc_inode *rpci = (struct rpc_inode *) foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR) {
|
|
inode_init_once(&rpci->vfs_inode);
|
|
rpci->private = NULL;
|
|
rpci->nreaders = 0;
|
|
rpci->nwriters = 0;
|
|
INIT_LIST_HEAD(&rpci->in_upcall);
|
|
INIT_LIST_HEAD(&rpci->pipe);
|
|
rpci->pipelen = 0;
|
|
init_waitqueue_head(&rpci->waitq);
|
|
INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci);
|
|
rpci->ops = NULL;
|
|
}
|
|
}
|
|
|
|
int register_rpc_pipefs(void)
|
|
{
|
|
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, NULL);
|
|
if (!rpc_inode_cachep)
|
|
return -ENOMEM;
|
|
register_filesystem(&rpc_pipe_fs_type);
|
|
return 0;
|
|
}
|
|
|
|
void unregister_rpc_pipefs(void)
|
|
{
|
|
if (kmem_cache_destroy(rpc_inode_cachep))
|
|
printk(KERN_WARNING "RPC: unable to free inode cache\n");
|
|
unregister_filesystem(&rpc_pipe_fs_type);
|
|
}
|