mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 17:18:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
499
fs/nfs/callback.c
Normal file
499
fs/nfs/callback.c
Normal file
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|
@ -0,0 +1,499 @@
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/*
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* linux/fs/nfs/callback.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback handling
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*/
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#include <linux/completion.h>
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#include <linux/ip.h>
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#include <linux/module.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/nfs_fs.h>
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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include <net/inet_sock.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "internal.h"
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#include "netns.h"
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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struct nfs_callback_data {
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unsigned int users;
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struct svc_serv *serv;
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struct svc_rqst *rqst;
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struct task_struct *task;
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};
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static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
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static DEFINE_MUTEX(nfs_callback_mutex);
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static struct svc_program nfs4_callback_program;
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static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
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{
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int ret;
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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ret = svc_create_xprt(serv, "tcp", net, PF_INET,
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
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if (ret <= 0)
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goto out_err;
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nn->nfs_callback_tcpport = ret;
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dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
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nn->nfs_callback_tcpport, PF_INET, net);
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ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
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if (ret > 0) {
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nn->nfs_callback_tcpport6 = ret;
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dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
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nn->nfs_callback_tcpport6, PF_INET6, net);
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} else if (ret != -EAFNOSUPPORT)
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goto out_err;
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return 0;
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out_err:
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return (ret) ? ret : -ENOMEM;
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}
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/*
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* This is the NFSv4 callback kernel thread.
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*/
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static int
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nfs4_callback_svc(void *vrqstp)
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{
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int err;
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struct svc_rqst *rqstp = vrqstp;
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set_freezable();
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while (!kthread_should_stop()) {
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/*
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* Listen for a request on the socket
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*/
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err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
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if (err == -EAGAIN || err == -EINTR)
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continue;
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svc_process(rqstp);
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}
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return 0;
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}
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/*
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* Prepare to bring up the NFSv4 callback service
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*/
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static struct svc_rqst *
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nfs4_callback_up(struct svc_serv *serv)
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{
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return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
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}
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#if defined(CONFIG_NFS_V4_1)
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static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
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{
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/*
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* Create an svc_sock for the back channel service that shares the
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* fore channel connection.
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* Returns the input port (0) and sets the svc_serv bc_xprt on success
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*/
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return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
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SVC_SOCK_ANONYMOUS);
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}
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/*
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* The callback service for NFSv4.1 callbacks
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*/
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static int
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nfs41_callback_svc(void *vrqstp)
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{
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struct svc_rqst *rqstp = vrqstp;
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struct svc_serv *serv = rqstp->rq_server;
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struct rpc_rqst *req;
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int error;
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DEFINE_WAIT(wq);
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set_freezable();
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while (!kthread_should_stop()) {
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if (try_to_freeze())
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continue;
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prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_UNINTERRUPTIBLE);
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spin_lock_bh(&serv->sv_cb_lock);
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if (!list_empty(&serv->sv_cb_list)) {
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req = list_first_entry(&serv->sv_cb_list,
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struct rpc_rqst, rq_bc_list);
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list_del(&req->rq_bc_list);
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spin_unlock_bh(&serv->sv_cb_lock);
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finish_wait(&serv->sv_cb_waitq, &wq);
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dprintk("Invoking bc_svc_process()\n");
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error = bc_svc_process(serv, req, rqstp);
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dprintk("bc_svc_process() returned w/ error code= %d\n",
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error);
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} else {
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spin_unlock_bh(&serv->sv_cb_lock);
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/* schedule_timeout to game the hung task watchdog */
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schedule_timeout(60 * HZ);
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finish_wait(&serv->sv_cb_waitq, &wq);
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}
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}
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return 0;
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}
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/*
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* Bring up the NFSv4.1 callback service
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*/
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static struct svc_rqst *
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nfs41_callback_up(struct svc_serv *serv)
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{
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struct svc_rqst *rqstp;
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INIT_LIST_HEAD(&serv->sv_cb_list);
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spin_lock_init(&serv->sv_cb_lock);
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init_waitqueue_head(&serv->sv_cb_waitq);
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rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
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if (IS_ERR(rqstp)) {
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svc_xprt_put(serv->sv_bc_xprt);
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serv->sv_bc_xprt = NULL;
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}
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dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
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return rqstp;
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}
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static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
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struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
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{
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*rqstpp = nfs41_callback_up(serv);
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*callback_svc = nfs41_callback_svc;
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}
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static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
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struct svc_serv *serv)
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{
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if (minorversion)
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/*
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* Save the svc_serv in the transport so that it can
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* be referenced when the session backchannel is initialized
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*/
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xprt->bc_serv = serv;
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}
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#else
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static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
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{
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return 0;
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}
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static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
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struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
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{
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*rqstpp = ERR_PTR(-ENOTSUPP);
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*callback_svc = ERR_PTR(-ENOTSUPP);
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}
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static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
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struct svc_serv *serv)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
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struct svc_serv *serv)
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{
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struct svc_rqst *rqstp;
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int (*callback_svc)(void *vrqstp);
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struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
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int ret;
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nfs_callback_bc_serv(minorversion, xprt, serv);
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if (cb_info->task)
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return 0;
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switch (minorversion) {
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case 0:
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/* v4.0 callback setup */
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rqstp = nfs4_callback_up(serv);
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callback_svc = nfs4_callback_svc;
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break;
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default:
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nfs_minorversion_callback_svc_setup(serv,
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&rqstp, &callback_svc);
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}
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if (IS_ERR(rqstp))
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return PTR_ERR(rqstp);
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svc_sock_update_bufs(serv);
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cb_info->serv = serv;
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cb_info->rqst = rqstp;
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cb_info->task = kthread_create(callback_svc, cb_info->rqst,
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"nfsv4.%u-svc", minorversion);
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if (IS_ERR(cb_info->task)) {
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ret = PTR_ERR(cb_info->task);
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svc_exit_thread(cb_info->rqst);
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cb_info->rqst = NULL;
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cb_info->task = NULL;
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return ret;
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}
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rqstp->rq_task = cb_info->task;
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wake_up_process(cb_info->task);
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dprintk("nfs_callback_up: service started\n");
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return 0;
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}
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static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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if (--nn->cb_users[minorversion])
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return;
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dprintk("NFS: destroy per-net callback data; net=%p\n", net);
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svc_shutdown_net(serv, net);
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}
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static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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int ret;
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if (nn->cb_users[minorversion]++)
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return 0;
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dprintk("NFS: create per-net callback data; net=%p\n", net);
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ret = svc_bind(serv, net);
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if (ret < 0) {
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printk(KERN_WARNING "NFS: bind callback service failed\n");
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goto err_bind;
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}
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switch (minorversion) {
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case 0:
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ret = nfs4_callback_up_net(serv, net);
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||||
break;
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||||
case 1:
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||||
case 2:
|
||||
ret = nfs41_callback_up_net(serv, net);
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||||
break;
|
||||
default:
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||||
printk(KERN_ERR "NFS: unknown callback version: %d\n",
|
||||
minorversion);
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR "NFS: callback service start failed\n");
|
||||
goto err_socks;
|
||||
}
|
||||
return 0;
|
||||
|
||||
err_socks:
|
||||
svc_rpcb_cleanup(serv, net);
|
||||
err_bind:
|
||||
dprintk("NFS: Couldn't create callback socket: err = %d; "
|
||||
"net = %p\n", ret, net);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct svc_serv *nfs_callback_create_svc(int minorversion)
|
||||
{
|
||||
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
||||
struct svc_serv *serv;
|
||||
|
||||
/*
|
||||
* Check whether we're already up and running.
|
||||
*/
|
||||
if (cb_info->task) {
|
||||
/*
|
||||
* Note: increase service usage, because later in case of error
|
||||
* svc_destroy() will be called.
|
||||
*/
|
||||
svc_get(cb_info->serv);
|
||||
return cb_info->serv;
|
||||
}
|
||||
|
||||
/*
|
||||
* Sanity check: if there's no task,
|
||||
* we should be the first user ...
|
||||
*/
|
||||
if (cb_info->users)
|
||||
printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
|
||||
cb_info->users);
|
||||
|
||||
serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
|
||||
if (!serv) {
|
||||
printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
/* As there is only one thread we need to over-ride the
|
||||
* default maximum of 80 connections
|
||||
*/
|
||||
serv->sv_maxconn = 1024;
|
||||
dprintk("nfs_callback_create_svc: service created\n");
|
||||
return serv;
|
||||
}
|
||||
|
||||
/*
|
||||
* Bring up the callback thread if it is not already up.
|
||||
*/
|
||||
int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
|
||||
{
|
||||
struct svc_serv *serv;
|
||||
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
||||
int ret;
|
||||
struct net *net = xprt->xprt_net;
|
||||
|
||||
mutex_lock(&nfs_callback_mutex);
|
||||
|
||||
serv = nfs_callback_create_svc(minorversion);
|
||||
if (IS_ERR(serv)) {
|
||||
ret = PTR_ERR(serv);
|
||||
goto err_create;
|
||||
}
|
||||
|
||||
ret = nfs_callback_up_net(minorversion, serv, net);
|
||||
if (ret < 0)
|
||||
goto err_net;
|
||||
|
||||
ret = nfs_callback_start_svc(minorversion, xprt, serv);
|
||||
if (ret < 0)
|
||||
goto err_start;
|
||||
|
||||
cb_info->users++;
|
||||
/*
|
||||
* svc_create creates the svc_serv with sv_nrthreads == 1, and then
|
||||
* svc_prepare_thread increments that. So we need to call svc_destroy
|
||||
* on both success and failure so that the refcount is 1 when the
|
||||
* thread exits.
|
||||
*/
|
||||
err_net:
|
||||
svc_destroy(serv);
|
||||
err_create:
|
||||
mutex_unlock(&nfs_callback_mutex);
|
||||
return ret;
|
||||
|
||||
err_start:
|
||||
nfs_callback_down_net(minorversion, serv, net);
|
||||
dprintk("NFS: Couldn't create server thread; err = %d\n", ret);
|
||||
goto err_net;
|
||||
}
|
||||
|
||||
/*
|
||||
* Kill the callback thread if it's no longer being used.
|
||||
*/
|
||||
void nfs_callback_down(int minorversion, struct net *net)
|
||||
{
|
||||
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
||||
|
||||
mutex_lock(&nfs_callback_mutex);
|
||||
nfs_callback_down_net(minorversion, cb_info->serv, net);
|
||||
cb_info->users--;
|
||||
if (cb_info->users == 0 && cb_info->task != NULL) {
|
||||
kthread_stop(cb_info->task);
|
||||
dprintk("nfs_callback_down: service stopped\n");
|
||||
svc_exit_thread(cb_info->rqst);
|
||||
dprintk("nfs_callback_down: service destroyed\n");
|
||||
cb_info->serv = NULL;
|
||||
cb_info->rqst = NULL;
|
||||
cb_info->task = NULL;
|
||||
}
|
||||
mutex_unlock(&nfs_callback_mutex);
|
||||
}
|
||||
|
||||
/* Boolean check of RPC_AUTH_GSS principal */
|
||||
int
|
||||
check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
|
||||
{
|
||||
char *p = rqstp->rq_cred.cr_principal;
|
||||
|
||||
if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
|
||||
return 1;
|
||||
|
||||
/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
|
||||
if (clp->cl_minorversion != 0)
|
||||
return 0;
|
||||
/*
|
||||
* It might just be a normal user principal, in which case
|
||||
* userspace won't bother to tell us the name at all.
|
||||
*/
|
||||
if (p == NULL)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* Did we get the acceptor from userland during the SETCLIENID
|
||||
* negotiation?
|
||||
*/
|
||||
if (clp->cl_acceptor)
|
||||
return !strcmp(p, clp->cl_acceptor);
|
||||
|
||||
/*
|
||||
* Otherwise try to verify it using the cl_hostname. Note that this
|
||||
* doesn't work if a non-canonical hostname was used in the devname.
|
||||
*/
|
||||
|
||||
/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
|
||||
|
||||
if (memcmp(p, "nfs@", 4) != 0)
|
||||
return 0;
|
||||
p += 4;
|
||||
if (strcmp(p, clp->cl_hostname) != 0)
|
||||
return 0;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* pg_authenticate method for nfsv4 callback threads.
|
||||
*
|
||||
* The authflavor has been negotiated, so an incorrect flavor is a server
|
||||
* bug. Drop packets with incorrect authflavor.
|
||||
*
|
||||
* All other checking done after NFS decoding where the nfs_client can be
|
||||
* found in nfs4_callback_compound
|
||||
*/
|
||||
static int nfs_callback_authenticate(struct svc_rqst *rqstp)
|
||||
{
|
||||
switch (rqstp->rq_authop->flavour) {
|
||||
case RPC_AUTH_NULL:
|
||||
if (rqstp->rq_proc != CB_NULL)
|
||||
return SVC_DROP;
|
||||
break;
|
||||
case RPC_AUTH_GSS:
|
||||
/* No RPC_AUTH_GSS support yet in NFSv4.1 */
|
||||
if (svc_is_backchannel(rqstp))
|
||||
return SVC_DROP;
|
||||
}
|
||||
return SVC_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* Define NFS4 callback program
|
||||
*/
|
||||
static struct svc_version *nfs4_callback_version[] = {
|
||||
[1] = &nfs4_callback_version1,
|
||||
[4] = &nfs4_callback_version4,
|
||||
};
|
||||
|
||||
static struct svc_stat nfs4_callback_stats;
|
||||
|
||||
static struct svc_program nfs4_callback_program = {
|
||||
.pg_prog = NFS4_CALLBACK, /* RPC service number */
|
||||
.pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */
|
||||
.pg_vers = nfs4_callback_version, /* version table */
|
||||
.pg_name = "NFSv4 callback", /* service name */
|
||||
.pg_class = "nfs", /* authentication class */
|
||||
.pg_stats = &nfs4_callback_stats,
|
||||
.pg_authenticate = nfs_callback_authenticate,
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue