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1517 lines
36 KiB
1517 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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 <[email protected]> |
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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/fs_context.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 <linux/utsname.h> |
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|
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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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|
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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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|
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#include "netns.h" |
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#include "sunrpc.h" |
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|
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#define RPCDBG_FACILITY RPCDBG_DEBUG |
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|
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#define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") |
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|
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static struct file_system_type rpc_pipe_fs_type; |
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static const struct rpc_pipe_ops gssd_dummy_pipe_ops; |
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|
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static struct kmem_cache *rpc_inode_cachep __read_mostly; |
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|
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#define RPC_UPCALL_TIMEOUT (30*HZ) |
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|
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static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
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|
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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_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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|
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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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|
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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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|
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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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|
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if (waitq) |
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wake_up(waitq); |
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} |
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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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|
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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(d_inode(dentry))->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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|
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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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/** |
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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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|
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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(d_inode(dentry))->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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|
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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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|
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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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|
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inode_lock(inode); |
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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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inode_unlock(inode); |
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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 = 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_free_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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|
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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_pipe *pipe; |
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int first_open; |
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int res = -ENXIO; |
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|
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inode_lock(inode); |
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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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inode_unlock(inode); |
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return res; |
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} |
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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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|
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inode_lock(inode); |
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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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inode_unlock(inode); |
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return 0; |
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} |
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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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|
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inode_lock(inode); |
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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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inode_unlock(inode); |
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return res; |
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} |
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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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|
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inode_lock(inode); |
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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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inode_unlock(inode); |
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return res; |
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} |
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|
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static __poll_t |
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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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__poll_t mask = EPOLLOUT | EPOLLWRNORM; |
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|
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poll_wait(filp, &rpci->waitq, wait); |
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|
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inode_lock(inode); |
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if (rpci->pipe == NULL) |
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mask |= EPOLLERR | EPOLLHUP; |
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else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
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mask |= EPOLLIN | EPOLLRDNORM; |
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inode_unlock(inode); |
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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; |
|
|
|
switch (cmd) { |
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case FIONREAD: |
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inode_lock(inode); |
|
pipe = RPC_I(inode)->pipe; |
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if (pipe == NULL) { |
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inode_unlock(inode); |
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return -EPIPE; |
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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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inode_unlock(inode); |
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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 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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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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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_program->name, |
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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)); |
|
rcu_read_unlock(); |
|
return 0; |
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} |
|
|
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static int |
|
rpc_info_open(struct inode *inode, struct file *file) |
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{ |
|
struct rpc_clnt *clnt = NULL; |
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int ret = single_open(file, rpc_show_info, NULL); |
|
|
|
if (!ret) { |
|
struct seq_file *m = file->private_data; |
|
|
|
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)) { |
|
spin_unlock(&file->f_path.dentry->d_lock); |
|
m->private = clnt; |
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} else { |
|
spin_unlock(&file->f_path.dentry->d_lock); |
|
single_release(inode, file); |
|
ret = -EINVAL; |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
static int |
|
rpc_info_release(struct inode *inode, struct file *file) |
|
{ |
|
struct seq_file *m = file->private_data; |
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struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; |
|
|
|
if (clnt) |
|
rpc_release_client(clnt); |
|
return single_release(inode, file); |
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} |
|
|
|
static const struct file_operations rpc_info_operations = { |
|
.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, |
|
}; |
|
|
|
|
|
/* |
|
* Description of fs contents. |
|
*/ |
|
struct rpc_filelist { |
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const char *name; |
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const struct file_operations *i_fop; |
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umode_t mode; |
|
}; |
|
|
|
static struct inode * |
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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(inode); |
|
switch (mode & S_IFMT) { |
|
case S_IFDIR: |
|
inode->i_fop = &simple_dir_operations; |
|
inode->i_op = &simple_dir_inode_operations; |
|
inc_nlink(inode); |
|
break; |
|
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 %pd\n", |
|
__FILE__, __func__, dentry); |
|
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(d_inode(dentry)); |
|
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); |
|
if (!ret) |
|
fsnotify_rmdir(dir, dentry); |
|
d_delete(dentry); |
|
dput(dentry); |
|
return ret; |
|
} |
|
|
|
static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
|
{ |
|
int ret; |
|
|
|
dget(dentry); |
|
ret = simple_unlink(dir, dentry); |
|
if (!ret) |
|
fsnotify_unlink(dir, dentry); |
|
d_delete(dentry); |
|
dput(dentry); |
|
return ret; |
|
} |
|
|
|
static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
|
|
rpc_close_pipes(inode); |
|
return __rpc_unlink(dir, dentry); |
|
} |
|
|
|
static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
|
const char *name) |
|
{ |
|
struct qstr q = QSTR_INIT(name, strlen(name)); |
|
struct dentry *dentry = d_hash_and_lookup(parent, &q); |
|
if (!dentry) { |
|
dentry = d_alloc(parent, &q); |
|
if (!dentry) |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
if (d_really_is_negative(dentry)) |
|
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 = d_inode(parent); |
|
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); |
|
dentry = d_hash_and_lookup(parent, &name); |
|
|
|
if (dentry == NULL) |
|
continue; |
|
if (d_really_is_negative(dentry)) |
|
goto next; |
|
switch (d_inode(dentry)->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 = d_inode(parent); |
|
|
|
inode_lock_nested(dir, I_MUTEX_CHILD); |
|
__rpc_depopulate(parent, files, start, eof); |
|
inode_unlock(dir); |
|
} |
|
|
|
static int rpc_populate(struct dentry *parent, |
|
const struct rpc_filelist *files, |
|
int start, int eof, |
|
void *private) |
|
{ |
|
struct inode *dir = d_inode(parent); |
|
struct dentry *dentry; |
|
int i, err; |
|
|
|
inode_lock(dir); |
|
for (i = start; i < eof; i++) { |
|
dentry = __rpc_lookup_create_exclusive(parent, files[i].name); |
|
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; |
|
} |
|
inode_unlock(dir); |
|
return 0; |
|
out_bad: |
|
__rpc_depopulate(parent, files, start, eof); |
|
inode_unlock(dir); |
|
printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", |
|
__FILE__, __func__, parent); |
|
return err; |
|
} |
|
|
|
static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
|
const char *name, umode_t mode, void *private, |
|
int (*populate)(struct dentry *, void *), void *args_populate) |
|
{ |
|
struct dentry *dentry; |
|
struct inode *dir = d_inode(parent); |
|
int error; |
|
|
|
inode_lock_nested(dir, 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: |
|
inode_unlock(dir); |
|
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 = d_inode(parent); |
|
inode_lock_nested(dir, I_MUTEX_PARENT); |
|
if (depopulate != NULL) |
|
depopulate(dentry); |
|
error = __rpc_rmdir(dir, dentry); |
|
inode_unlock(dir); |
|
dput(parent); |
|
return error; |
|
} |
|
|
|
/** |
|
* rpc_mkpipe_dentry - 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 = d_inode(parent); |
|
umode_t umode = S_IFIFO | 0600; |
|
int err; |
|
|
|
if (pipe->ops->upcall == NULL) |
|
umode &= ~0444; |
|
if (pipe->ops->downcall == NULL) |
|
umode &= ~0222; |
|
|
|
inode_lock_nested(dir, I_MUTEX_PARENT); |
|
dentry = __rpc_lookup_create_exclusive(parent, name); |
|
if (IS_ERR(dentry)) |
|
goto out; |
|
err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
|
private, pipe); |
|
if (err) |
|
goto out_err; |
|
out: |
|
inode_unlock(dir); |
|
return dentry; |
|
out_err: |
|
dentry = ERR_PTR(err); |
|
printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", |
|
__FILE__, __func__, parent, 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 = d_inode(parent); |
|
inode_lock_nested(dir, I_MUTEX_PARENT); |
|
error = __rpc_rmpipe(dir, dentry); |
|
inode_unlock(dir); |
|
dput(parent); |
|
return error; |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_unlink); |
|
|
|
/** |
|
* rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head |
|
* @pdh: pointer to struct rpc_pipe_dir_head |
|
*/ |
|
void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) |
|
{ |
|
INIT_LIST_HEAD(&pdh->pdh_entries); |
|
pdh->pdh_dentry = NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); |
|
|
|
/** |
|
* rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object |
|
* @pdo: pointer to struct rpc_pipe_dir_object |
|
* @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops |
|
* @pdo_data: pointer to caller-defined data |
|
*/ |
|
void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, |
|
const struct rpc_pipe_dir_object_ops *pdo_ops, |
|
void *pdo_data) |
|
{ |
|
INIT_LIST_HEAD(&pdo->pdo_head); |
|
pdo->pdo_ops = pdo_ops; |
|
pdo->pdo_data = pdo_data; |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); |
|
|
|
static int |
|
rpc_add_pipe_dir_object_locked(struct net *net, |
|
struct rpc_pipe_dir_head *pdh, |
|
struct rpc_pipe_dir_object *pdo) |
|
{ |
|
int ret = 0; |
|
|
|
if (pdh->pdh_dentry) |
|
ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); |
|
if (ret == 0) |
|
list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); |
|
return ret; |
|
} |
|
|
|
static void |
|
rpc_remove_pipe_dir_object_locked(struct net *net, |
|
struct rpc_pipe_dir_head *pdh, |
|
struct rpc_pipe_dir_object *pdo) |
|
{ |
|
if (pdh->pdh_dentry) |
|
pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); |
|
list_del_init(&pdo->pdo_head); |
|
} |
|
|
|
/** |
|
* rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory |
|
* @net: pointer to struct net |
|
* @pdh: pointer to struct rpc_pipe_dir_head |
|
* @pdo: pointer to struct rpc_pipe_dir_object |
|
* |
|
*/ |
|
int |
|
rpc_add_pipe_dir_object(struct net *net, |
|
struct rpc_pipe_dir_head *pdh, |
|
struct rpc_pipe_dir_object *pdo) |
|
{ |
|
int ret = 0; |
|
|
|
if (list_empty(&pdo->pdo_head)) { |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
|
|
mutex_lock(&sn->pipefs_sb_lock); |
|
ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
|
mutex_unlock(&sn->pipefs_sb_lock); |
|
} |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); |
|
|
|
/** |
|
* rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory |
|
* @net: pointer to struct net |
|
* @pdh: pointer to struct rpc_pipe_dir_head |
|
* @pdo: pointer to struct rpc_pipe_dir_object |
|
* |
|
*/ |
|
void |
|
rpc_remove_pipe_dir_object(struct net *net, |
|
struct rpc_pipe_dir_head *pdh, |
|
struct rpc_pipe_dir_object *pdo) |
|
{ |
|
if (!list_empty(&pdo->pdo_head)) { |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
|
|
mutex_lock(&sn->pipefs_sb_lock); |
|
rpc_remove_pipe_dir_object_locked(net, pdh, pdo); |
|
mutex_unlock(&sn->pipefs_sb_lock); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); |
|
|
|
/** |
|
* rpc_find_or_alloc_pipe_dir_object |
|
* @net: pointer to struct net |
|
* @pdh: pointer to struct rpc_pipe_dir_head |
|
* @match: match struct rpc_pipe_dir_object to data |
|
* @alloc: allocate a new struct rpc_pipe_dir_object |
|
* @data: user defined data for match() and alloc() |
|
* |
|
*/ |
|
struct rpc_pipe_dir_object * |
|
rpc_find_or_alloc_pipe_dir_object(struct net *net, |
|
struct rpc_pipe_dir_head *pdh, |
|
int (*match)(struct rpc_pipe_dir_object *, void *), |
|
struct rpc_pipe_dir_object *(*alloc)(void *), |
|
void *data) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct rpc_pipe_dir_object *pdo; |
|
|
|
mutex_lock(&sn->pipefs_sb_lock); |
|
list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { |
|
if (!match(pdo, data)) |
|
continue; |
|
goto out; |
|
} |
|
pdo = alloc(data); |
|
if (!pdo) |
|
goto out; |
|
rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
|
out: |
|
mutex_unlock(&sn->pipefs_sb_lock); |
|
return pdo; |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); |
|
|
|
static void |
|
rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
|
{ |
|
struct rpc_pipe_dir_object *pdo; |
|
struct dentry *dir = pdh->pdh_dentry; |
|
|
|
list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
|
pdo->pdo_ops->create(dir, pdo); |
|
} |
|
|
|
static void |
|
rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
|
{ |
|
struct rpc_pipe_dir_object *pdo; |
|
struct dentry *dir = pdh->pdh_dentry; |
|
|
|
list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
|
pdo->pdo_ops->destroy(dir, pdo); |
|
} |
|
|
|
enum { |
|
RPCAUTH_info, |
|
RPCAUTH_EOF |
|
}; |
|
|
|
static const struct rpc_filelist authfiles[] = { |
|
[RPCAUTH_info] = { |
|
.name = "info", |
|
.i_fop = &rpc_info_operations, |
|
.mode = S_IFREG | 0400, |
|
}, |
|
}; |
|
|
|
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: the parent of new directory |
|
* @name: the name of new directory |
|
* @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, |
|
const char *name, |
|
struct rpc_clnt *rpc_client) |
|
{ |
|
struct dentry *ret; |
|
|
|
ret = rpc_mkdir_populate(dentry, name, 0555, NULL, |
|
rpc_clntdir_populate, rpc_client); |
|
if (!IS_ERR(ret)) { |
|
rpc_client->cl_pipedir_objects.pdh_dentry = ret; |
|
rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() |
|
* @rpc_client: rpc_client for the pipe |
|
*/ |
|
int rpc_remove_client_dir(struct rpc_clnt *rpc_client) |
|
{ |
|
struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; |
|
|
|
if (dentry == NULL) |
|
return 0; |
|
rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
|
rpc_client->cl_pipedir_objects.pdh_dentry = NULL; |
|
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 | 0600, |
|
}, |
|
[1] = { |
|
.name = "content", |
|
.i_fop = &content_file_operations_pipefs, |
|
.mode = S_IFREG | 0400, |
|
}, |
|
[2] = { |
|
.name = "flush", |
|
.i_fop = &cache_flush_operations_pipefs, |
|
.mode = S_IFREG | 0600, |
|
}, |
|
}; |
|
|
|
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, const char *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, |
|
.free_inode = rpc_free_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_gssd, |
|
RPCAUTH_RootEOF |
|
}; |
|
|
|
static const struct rpc_filelist files[] = { |
|
[RPCAUTH_lockd] = { |
|
.name = "lockd", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_mount] = { |
|
.name = "mount", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_nfs] = { |
|
.name = "nfs", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_portmap] = { |
|
.name = "portmap", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_statd] = { |
|
.name = "statd", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_nfsd4_cb] = { |
|
.name = "nfsd4_cb", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_cache] = { |
|
.name = "cache", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_nfsd] = { |
|
.name = "nfsd", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
[RPCAUTH_gssd] = { |
|
.name = "gssd", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
}; |
|
|
|
/* |
|
* 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)); |
|
return d_hash_and_lookup(sb->s_root, &dir); |
|
} |
|
EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); |
|
|
|
int rpc_pipefs_init_net(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
|
|
sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); |
|
if (IS_ERR(sn->gssd_dummy)) |
|
return PTR_ERR(sn->gssd_dummy); |
|
|
|
mutex_init(&sn->pipefs_sb_lock); |
|
sn->pipe_version = -1; |
|
return 0; |
|
} |
|
|
|
void rpc_pipefs_exit_net(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
|
|
rpc_destroy_pipe_data(sn->gssd_dummy); |
|
} |
|
|
|
/* |
|
* 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 const struct rpc_filelist gssd_dummy_clnt_dir[] = { |
|
[0] = { |
|
.name = "clntXX", |
|
.mode = S_IFDIR | 0555, |
|
}, |
|
}; |
|
|
|
static ssize_t |
|
dummy_downcall(struct file *filp, const char __user *src, size_t len) |
|
{ |
|
return -EINVAL; |
|
} |
|
|
|
static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { |
|
.upcall = rpc_pipe_generic_upcall, |
|
.downcall = dummy_downcall, |
|
}; |
|
|
|
/* |
|
* Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect |
|
* that it will ever use this info to handle an upcall, but rpc.gssd expects |
|
* that this file will be there and have a certain format. |
|
*/ |
|
static int |
|
rpc_dummy_info_show(struct seq_file *m, void *v) |
|
{ |
|
seq_printf(m, "RPC server: %s\n", utsname()->nodename); |
|
seq_printf(m, "service: foo (1) version 0\n"); |
|
seq_printf(m, "address: 127.0.0.1\n"); |
|
seq_printf(m, "protocol: tcp\n"); |
|
seq_printf(m, "port: 0\n"); |
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info); |
|
|
|
static const struct rpc_filelist gssd_dummy_info_file[] = { |
|
[0] = { |
|
.name = "info", |
|
.i_fop = &rpc_dummy_info_fops, |
|
.mode = S_IFREG | 0400, |
|
}, |
|
}; |
|
|
|
/** |
|
* rpc_gssd_dummy_populate - create a dummy gssd pipe |
|
* @root: root of the rpc_pipefs filesystem |
|
* @pipe_data: pipe data created when netns is initialized |
|
* |
|
* Create a dummy set of directories and a pipe that gssd can hold open to |
|
* indicate that it is up and running. |
|
*/ |
|
static struct dentry * |
|
rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) |
|
{ |
|
int ret = 0; |
|
struct dentry *gssd_dentry; |
|
struct dentry *clnt_dentry = NULL; |
|
struct dentry *pipe_dentry = NULL; |
|
struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, |
|
strlen(files[RPCAUTH_gssd].name)); |
|
|
|
/* We should never get this far if "gssd" doesn't exist */ |
|
gssd_dentry = d_hash_and_lookup(root, &q); |
|
if (!gssd_dentry) |
|
return ERR_PTR(-ENOENT); |
|
|
|
ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); |
|
if (ret) { |
|
pipe_dentry = ERR_PTR(ret); |
|
goto out; |
|
} |
|
|
|
q.name = gssd_dummy_clnt_dir[0].name; |
|
q.len = strlen(gssd_dummy_clnt_dir[0].name); |
|
clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); |
|
if (!clnt_dentry) { |
|
__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
|
pipe_dentry = ERR_PTR(-ENOENT); |
|
goto out; |
|
} |
|
|
|
ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL); |
|
if (ret) { |
|
__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
|
pipe_dentry = ERR_PTR(ret); |
|
goto out; |
|
} |
|
|
|
pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); |
|
if (IS_ERR(pipe_dentry)) { |
|
__rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1); |
|
__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
|
} |
|
out: |
|
dput(clnt_dentry); |
|
dput(gssd_dentry); |
|
return pipe_dentry; |
|
} |
|
|
|
static void |
|
rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry) |
|
{ |
|
struct dentry *clnt_dir = pipe_dentry->d_parent; |
|
struct dentry *gssd_dir = clnt_dir->d_parent; |
|
|
|
dget(pipe_dentry); |
|
__rpc_rmpipe(d_inode(clnt_dir), pipe_dentry); |
|
__rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1); |
|
__rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1); |
|
dput(pipe_dentry); |
|
} |
|
|
|
static int |
|
rpc_fill_super(struct super_block *sb, struct fs_context *fc) |
|
{ |
|
struct inode *inode; |
|
struct dentry *root, *gssd_dentry; |
|
struct net *net = sb->s_fs_info; |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
int err; |
|
|
|
sb->s_blocksize = PAGE_SIZE; |
|
sb->s_blocksize_bits = PAGE_SHIFT; |
|
sb->s_magic = RPCAUTH_GSSMAGIC; |
|
sb->s_op = &s_ops; |
|
sb->s_d_op = &simple_dentry_operations; |
|
sb->s_time_gran = 1; |
|
|
|
inode = rpc_get_inode(sb, S_IFDIR | 0555); |
|
sb->s_root = root = d_make_root(inode); |
|
if (!root) |
|
return -ENOMEM; |
|
if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
|
return -ENOMEM; |
|
|
|
gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); |
|
if (IS_ERR(gssd_dentry)) { |
|
__rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
|
return PTR_ERR(gssd_dentry); |
|
} |
|
|
|
dprintk("RPC: sending pipefs MOUNT notification for net %x%s\n", |
|
net->ns.inum, 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; |
|
mutex_unlock(&sn->pipefs_sb_lock); |
|
return 0; |
|
|
|
err_depopulate: |
|
rpc_gssd_dummy_depopulate(gssd_dentry); |
|
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; |
|
} |
|
|
|
bool |
|
gssd_running(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct rpc_pipe *pipe = sn->gssd_dummy; |
|
|
|
return pipe->nreaders || pipe->nwriters; |
|
} |
|
EXPORT_SYMBOL_GPL(gssd_running); |
|
|
|
static int rpc_fs_get_tree(struct fs_context *fc) |
|
{ |
|
return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns)); |
|
} |
|
|
|
static void rpc_fs_free_fc(struct fs_context *fc) |
|
{ |
|
if (fc->s_fs_info) |
|
put_net(fc->s_fs_info); |
|
} |
|
|
|
static const struct fs_context_operations rpc_fs_context_ops = { |
|
.free = rpc_fs_free_fc, |
|
.get_tree = rpc_fs_get_tree, |
|
}; |
|
|
|
static int rpc_init_fs_context(struct fs_context *fc) |
|
{ |
|
put_user_ns(fc->user_ns); |
|
fc->user_ns = get_user_ns(fc->net_ns->user_ns); |
|
fc->ops = &rpc_fs_context_ops; |
|
return 0; |
|
} |
|
|
|
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 %x%s\n", |
|
net->ns.inum, NET_NAME(net)); |
|
blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
|
RPC_PIPEFS_UMOUNT, |
|
sb); |
|
mutex_unlock(&sn->pipefs_sb_lock); |
|
out: |
|
kill_litter_super(sb); |
|
put_net(net); |
|
} |
|
|
|
static struct file_system_type rpc_pipe_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "rpc_pipefs", |
|
.init_fs_context = rpc_init_fs_context, |
|
.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|SLAB_ACCOUNT), |
|
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(); |
|
unregister_filesystem(&rpc_pipe_fs_type); |
|
kmem_cache_destroy(rpc_inode_cachep); |
|
}
|
|
|