11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * net/sunrpc/rpc_pipe.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Userland/kernel interface for rpcauth_gss. 51da177e4SLinus Torvalds * Code shamelessly plagiarized from fs/nfsd/nfsctl.c 6d51fe1beSRolf Eike Beer * and fs/sysfs/inode.c 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/slab.h> 131da177e4SLinus Torvalds #include <linux/string.h> 141da177e4SLinus Torvalds #include <linux/pagemap.h> 151da177e4SLinus Torvalds #include <linux/mount.h> 161da177e4SLinus Torvalds #include <linux/namei.h> 1750e437d5STrond Myklebust #include <linux/fsnotify.h> 181da177e4SLinus Torvalds #include <linux/kernel.h> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <asm/ioctls.h> 211da177e4SLinus Torvalds #include <linux/fs.h> 221da177e4SLinus Torvalds #include <linux/poll.h> 231da177e4SLinus Torvalds #include <linux/wait.h> 241da177e4SLinus Torvalds #include <linux/seq_file.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 271da177e4SLinus Torvalds #include <linux/workqueue.h> 281da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 298854e82dSTrond Myklebust #include <linux/sunrpc/cache.h> 30021c68deSStanislav Kinsbursky #include <linux/nsproxy.h> 312d00131aSStanislav Kinsbursky #include <linux/notifier.h> 32021c68deSStanislav Kinsbursky 33021c68deSStanislav Kinsbursky #include "netns.h" 342d00131aSStanislav Kinsbursky #include "sunrpc.h" 351da177e4SLinus Torvalds 36efc46bf2SStanislav Kinsbursky #define RPCDBG_FACILITY RPCDBG_DEBUG 37efc46bf2SStanislav Kinsbursky 38efc46bf2SStanislav Kinsbursky #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") 39efc46bf2SStanislav Kinsbursky 40fc14f2feSAl Viro static struct vfsmount *rpc_mnt __read_mostly; 411da177e4SLinus Torvalds static int rpc_mount_count; 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds 46e18b890bSChristoph Lameter static struct kmem_cache *rpc_inode_cachep __read_mostly; 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #define RPC_UPCALL_TIMEOUT (30*HZ) 491da177e4SLinus Torvalds 502d00131aSStanislav Kinsbursky static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); 512d00131aSStanislav Kinsbursky 522d00131aSStanislav Kinsbursky int rpc_pipefs_notifier_register(struct notifier_block *nb) 532d00131aSStanislav Kinsbursky { 542d00131aSStanislav Kinsbursky return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); 552d00131aSStanislav Kinsbursky } 562d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); 572d00131aSStanislav Kinsbursky 582d00131aSStanislav Kinsbursky void rpc_pipefs_notifier_unregister(struct notifier_block *nb) 592d00131aSStanislav Kinsbursky { 602d00131aSStanislav Kinsbursky blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); 612d00131aSStanislav Kinsbursky } 622d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); 632d00131aSStanislav Kinsbursky 64ba9e0975SStanislav Kinsbursky static void rpc_purge_list(struct rpc_pipe *pipe, struct list_head *head, 659842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *), int err) 66b3eb67a2STrond Myklebust { 67b3eb67a2STrond Myklebust struct rpc_pipe_msg *msg; 68b3eb67a2STrond Myklebust 699842ef35STrond Myklebust if (list_empty(head)) 709842ef35STrond Myklebust return; 719842ef35STrond Myklebust do { 72b3eb67a2STrond Myklebust msg = list_entry(head->next, struct rpc_pipe_msg, list); 735a67657aSTrond Myklebust list_del_init(&msg->list); 74b3eb67a2STrond Myklebust msg->errno = err; 75b3eb67a2STrond Myklebust destroy_msg(msg); 769842ef35STrond Myklebust } while (!list_empty(head)); 77ba9e0975SStanislav Kinsbursky wake_up(&pipe->waitq); 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds static void 8165f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 821da177e4SLinus Torvalds { 839842ef35STrond Myklebust LIST_HEAD(free_list); 84ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = 85ba9e0975SStanislav Kinsbursky container_of(work, struct rpc_pipe, queue_timeout.work); 869842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 871da177e4SLinus Torvalds 88ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 89ba9e0975SStanislav Kinsbursky if (pipe->ops == NULL) { 90ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 919842ef35STrond Myklebust return; 929842ef35STrond Myklebust } 93ba9e0975SStanislav Kinsbursky destroy_msg = pipe->ops->destroy_msg; 94ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 95ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 96ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 979842ef35STrond Myklebust } 98ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 99ba9e0975SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT); 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 102c1225158SPeng Tao ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, 103c1225158SPeng Tao char __user *dst, size_t buflen) 104c1225158SPeng Tao { 105c1225158SPeng Tao char *data = (char *)msg->data + msg->copied; 106c1225158SPeng Tao size_t mlen = min(msg->len - msg->copied, buflen); 107c1225158SPeng Tao unsigned long left; 108c1225158SPeng Tao 109c1225158SPeng Tao left = copy_to_user(dst, data, mlen); 110c1225158SPeng Tao if (left == mlen) { 111c1225158SPeng Tao msg->errno = -EFAULT; 112c1225158SPeng Tao return -EFAULT; 113c1225158SPeng Tao } 114c1225158SPeng Tao 115c1225158SPeng Tao mlen -= left; 116c1225158SPeng Tao msg->copied += mlen; 117c1225158SPeng Tao msg->errno = 0; 118c1225158SPeng Tao return mlen; 119c1225158SPeng Tao } 120c1225158SPeng Tao EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 121c1225158SPeng Tao 12293a44a75SJ. Bruce Fields /** 1231a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 12493a44a75SJ. Bruce Fields * @inode: inode of upcall pipe on which to queue given message 12593a44a75SJ. Bruce Fields * @msg: message to queue 12693a44a75SJ. Bruce Fields * 12793a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 12893a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 12993a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 13093a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 13193a44a75SJ. Bruce Fields */ 1321da177e4SLinus Torvalds int 1331da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1366070fe6fSTrond Myklebust int res = -EPIPE; 1371da177e4SLinus Torvalds 138ba9e0975SStanislav Kinsbursky spin_lock(&rpci->pipe->lock); 139ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops == NULL) 1406070fe6fSTrond Myklebust goto out; 141ba9e0975SStanislav Kinsbursky if (rpci->pipe->nreaders) { 142ba9e0975SStanislav Kinsbursky list_add_tail(&msg->list, &rpci->pipe->pipe); 143ba9e0975SStanislav Kinsbursky rpci->pipe->pipelen += msg->len; 1446070fe6fSTrond Myklebust res = 0; 145ba9e0975SStanislav Kinsbursky } else if (rpci->pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { 146ba9e0975SStanislav Kinsbursky if (list_empty(&rpci->pipe->pipe)) 14724c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 148ba9e0975SStanislav Kinsbursky &rpci->pipe->queue_timeout, 1491da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 150ba9e0975SStanislav Kinsbursky list_add_tail(&msg->list, &rpci->pipe->pipe); 151ba9e0975SStanislav Kinsbursky rpci->pipe->pipelen += msg->len; 1526070fe6fSTrond Myklebust res = 0; 1536070fe6fSTrond Myklebust } 1546070fe6fSTrond Myklebust out: 155ba9e0975SStanislav Kinsbursky spin_unlock(&rpci->pipe->lock); 156ba9e0975SStanislav Kinsbursky wake_up(&rpci->pipe->waitq); 1571da177e4SLinus Torvalds return res; 1581da177e4SLinus Torvalds } 159468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1601da177e4SLinus Torvalds 1616070fe6fSTrond Myklebust static inline void 1626070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1636070fe6fSTrond Myklebust { 1646070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1656070fe6fSTrond Myklebust } 1666070fe6fSTrond Myklebust 1671da177e4SLinus Torvalds static void 1681da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1691da177e4SLinus Torvalds { 170ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 171b693ba4aSTrond Myklebust const struct rpc_pipe_ops *ops; 172e712804aS\"J. Bruce Fields\ int need_release; 1731da177e4SLinus Torvalds 1741b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 175ba9e0975SStanislav Kinsbursky ops = pipe->ops; 1769842ef35STrond Myklebust if (ops != NULL) { 1779842ef35STrond Myklebust LIST_HEAD(free_list); 178ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 179ba9e0975SStanislav Kinsbursky need_release = pipe->nreaders != 0 || pipe->nwriters != 0; 180ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 181ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->in_upcall, &free_list); 182ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 183ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 184ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 185ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 186ba9e0975SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, ops->destroy_msg, -EPIPE); 187ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 188e712804aS\"J. Bruce Fields\ if (need_release && ops->release_pipe) 1899842ef35STrond Myklebust ops->release_pipe(inode); 190ba9e0975SStanislav Kinsbursky cancel_delayed_work_sync(&pipe->queue_timeout); 1911da177e4SLinus Torvalds } 1926070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1931b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static struct inode * 1971da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1981da177e4SLinus Torvalds { 1991da177e4SLinus Torvalds struct rpc_inode *rpci; 200e94b1766SChristoph Lameter rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); 2011da177e4SLinus Torvalds if (!rpci) 2021da177e4SLinus Torvalds return NULL; 2031da177e4SLinus Torvalds return &rpci->vfs_inode; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds static void 207fa0d7e3dSNick Piggin rpc_i_callback(struct rcu_head *head) 208fa0d7e3dSNick Piggin { 209fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 210ba9e0975SStanislav Kinsbursky kfree(RPC_I(inode)->pipe); 211fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 212fa0d7e3dSNick Piggin } 213fa0d7e3dSNick Piggin 214fa0d7e3dSNick Piggin static void 2151da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 2161da177e4SLinus Torvalds { 217fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, rpc_i_callback); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static int 2211da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 224c3810608S\"J. Bruce Fields\ int first_open; 2251da177e4SLinus Torvalds int res = -ENXIO; 2261da177e4SLinus Torvalds 2271b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 228ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops == NULL) 229c3810608S\"J. Bruce Fields\ goto out; 230ba9e0975SStanislav Kinsbursky first_open = rpci->pipe->nreaders == 0 && rpci->pipe->nwriters == 0; 231ba9e0975SStanislav Kinsbursky if (first_open && rpci->pipe->ops->open_pipe) { 232ba9e0975SStanislav Kinsbursky res = rpci->pipe->ops->open_pipe(inode); 233c3810608S\"J. Bruce Fields\ if (res) 234c3810608S\"J. Bruce Fields\ goto out; 235c3810608S\"J. Bruce Fields\ } 2361da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 237ba9e0975SStanislav Kinsbursky rpci->pipe->nreaders++; 2381da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 239ba9e0975SStanislav Kinsbursky rpci->pipe->nwriters++; 2401da177e4SLinus Torvalds res = 0; 241c3810608S\"J. Bruce Fields\ out: 2421b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2431da177e4SLinus Torvalds return res; 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds static int 2471da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2481da177e4SLinus Torvalds { 249ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 2501da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 251e712804aS\"J. Bruce Fields\ int last_close; 2521da177e4SLinus Torvalds 2531b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 254ba9e0975SStanislav Kinsbursky if (pipe->ops == NULL) 2551da177e4SLinus Torvalds goto out; 256655b5bb4SJoe Perches msg = filp->private_data; 2571da177e4SLinus Torvalds if (msg != NULL) { 258ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 25948e49187STrond Myklebust msg->errno = -EAGAIN; 2605a67657aSTrond Myklebust list_del_init(&msg->list); 261ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 262ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg(msg); 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 265ba9e0975SStanislav Kinsbursky pipe->nwriters --; 2669842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 267ba9e0975SStanislav Kinsbursky pipe->nreaders --; 268ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 2699842ef35STrond Myklebust LIST_HEAD(free_list); 270ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 271ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 272ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 273ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 274ba9e0975SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, 275ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg, -EAGAIN); 2769842ef35STrond Myklebust } 2779842ef35STrond Myklebust } 278ba9e0975SStanislav Kinsbursky last_close = pipe->nwriters == 0 && pipe->nreaders == 0; 279ba9e0975SStanislav Kinsbursky if (last_close && pipe->ops->release_pipe) 280ba9e0975SStanislav Kinsbursky pipe->ops->release_pipe(inode); 2811da177e4SLinus Torvalds out: 2821b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2831da177e4SLinus Torvalds return 0; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds static ssize_t 2871da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2881da177e4SLinus Torvalds { 289303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2901da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2911da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2921da177e4SLinus Torvalds int res = 0; 2931da177e4SLinus Torvalds 2941b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 295ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops == NULL) { 2961da177e4SLinus Torvalds res = -EPIPE; 2971da177e4SLinus Torvalds goto out_unlock; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds msg = filp->private_data; 3001da177e4SLinus Torvalds if (msg == NULL) { 301ba9e0975SStanislav Kinsbursky spin_lock(&rpci->pipe->lock); 302ba9e0975SStanislav Kinsbursky if (!list_empty(&rpci->pipe->pipe)) { 303ba9e0975SStanislav Kinsbursky msg = list_entry(rpci->pipe->pipe.next, 3041da177e4SLinus Torvalds struct rpc_pipe_msg, 3051da177e4SLinus Torvalds list); 306ba9e0975SStanislav Kinsbursky list_move(&msg->list, &rpci->pipe->in_upcall); 307ba9e0975SStanislav Kinsbursky rpci->pipe->pipelen -= msg->len; 3081da177e4SLinus Torvalds filp->private_data = msg; 3091da177e4SLinus Torvalds msg->copied = 0; 3101da177e4SLinus Torvalds } 311ba9e0975SStanislav Kinsbursky spin_unlock(&rpci->pipe->lock); 3121da177e4SLinus Torvalds if (msg == NULL) 3131da177e4SLinus Torvalds goto out_unlock; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 316ba9e0975SStanislav Kinsbursky res = rpci->pipe->ops->upcall(filp, msg, buf, len); 3171da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 3181da177e4SLinus Torvalds filp->private_data = NULL; 319ba9e0975SStanislav Kinsbursky spin_lock(&rpci->pipe->lock); 3205a67657aSTrond Myklebust list_del_init(&msg->list); 321ba9e0975SStanislav Kinsbursky spin_unlock(&rpci->pipe->lock); 322ba9e0975SStanislav Kinsbursky rpci->pipe->ops->destroy_msg(msg); 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds out_unlock: 3251b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3261da177e4SLinus Torvalds return res; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds static ssize_t 3301da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 3311da177e4SLinus Torvalds { 332303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 3331da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 3341da177e4SLinus Torvalds int res; 3351da177e4SLinus Torvalds 3361b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3371da177e4SLinus Torvalds res = -EPIPE; 338ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops != NULL) 339ba9e0975SStanislav Kinsbursky res = rpci->pipe->ops->downcall(filp, buf, len); 3401b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3411da177e4SLinus Torvalds return res; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds static unsigned int 3451da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3461da177e4SLinus Torvalds { 3471da177e4SLinus Torvalds struct rpc_inode *rpci; 3481da177e4SLinus Torvalds unsigned int mask = 0; 3491da177e4SLinus Torvalds 350303b46bbSJosef Sipek rpci = RPC_I(filp->f_path.dentry->d_inode); 351ba9e0975SStanislav Kinsbursky poll_wait(filp, &rpci->pipe->waitq, wait); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 354ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops == NULL) 3551da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 356ba9e0975SStanislav Kinsbursky if (filp->private_data || !list_empty(&rpci->pipe->pipe)) 3571da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 3581da177e4SLinus Torvalds return mask; 3591da177e4SLinus Torvalds } 3601da177e4SLinus Torvalds 361a6f8dbc6SArnd Bergmann static long 362a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3631da177e4SLinus Torvalds { 364a6f8dbc6SArnd Bergmann struct inode *inode = filp->f_path.dentry->d_inode; 365a6f8dbc6SArnd Bergmann struct rpc_inode *rpci = RPC_I(inode); 3661da177e4SLinus Torvalds int len; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds switch (cmd) { 3691da177e4SLinus Torvalds case FIONREAD: 370ba9e0975SStanislav Kinsbursky spin_lock(&rpci->pipe->lock); 371ba9e0975SStanislav Kinsbursky if (rpci->pipe->ops == NULL) { 372ba9e0975SStanislav Kinsbursky spin_unlock(&rpci->pipe->lock); 3731da177e4SLinus Torvalds return -EPIPE; 374a6f8dbc6SArnd Bergmann } 375ba9e0975SStanislav Kinsbursky len = rpci->pipe->pipelen; 3761da177e4SLinus Torvalds if (filp->private_data) { 3771da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 378655b5bb4SJoe Perches msg = filp->private_data; 3791da177e4SLinus Torvalds len += msg->len - msg->copied; 3801da177e4SLinus Torvalds } 381ba9e0975SStanislav Kinsbursky spin_unlock(&rpci->pipe->lock); 3821da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3831da177e4SLinus Torvalds default: 3841da177e4SLinus Torvalds return -EINVAL; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 388da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3891da177e4SLinus Torvalds .owner = THIS_MODULE, 3901da177e4SLinus Torvalds .llseek = no_llseek, 3911da177e4SLinus Torvalds .read = rpc_pipe_read, 3921da177e4SLinus Torvalds .write = rpc_pipe_write, 3931da177e4SLinus Torvalds .poll = rpc_pipe_poll, 394674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3951da177e4SLinus Torvalds .open = rpc_pipe_open, 3961da177e4SLinus Torvalds .release = rpc_pipe_release, 3971da177e4SLinus Torvalds }; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds static int 4001da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 4011da177e4SLinus Torvalds { 4021da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 4051da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 4061da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 407e7f78657SChuck Lever seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 408e7f78657SChuck Lever seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); 409bf19aaceSJ. Bruce Fields seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); 4101da177e4SLinus Torvalds return 0; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds static int 4141da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 4151da177e4SLinus Torvalds { 416006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 4171da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds if (!ret) { 4201da177e4SLinus Torvalds struct seq_file *m = file->private_data; 421006abe88STrond Myklebust 422006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 423006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 4241da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 425006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 426006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4271da177e4SLinus Torvalds m->private = clnt; 4281da177e4SLinus Torvalds } else { 429006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4301da177e4SLinus Torvalds single_release(inode, file); 4311da177e4SLinus Torvalds ret = -EINVAL; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds return ret; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds static int 4381da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds struct seq_file *m = file->private_data; 4411da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds if (clnt) 4441da177e4SLinus Torvalds rpc_release_client(clnt); 4451da177e4SLinus Torvalds return single_release(inode, file); 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 448da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4491da177e4SLinus Torvalds .owner = THIS_MODULE, 4501da177e4SLinus Torvalds .open = rpc_info_open, 4511da177e4SLinus Torvalds .read = seq_read, 4521da177e4SLinus Torvalds .llseek = seq_lseek, 4531da177e4SLinus Torvalds .release = rpc_info_release, 4541da177e4SLinus Torvalds }; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds /* 4581da177e4SLinus Torvalds * Description of fs contents. 4591da177e4SLinus Torvalds */ 4601da177e4SLinus Torvalds struct rpc_filelist { 461ac6feceeSTrond Myklebust const char *name; 46299ac48f5SArjan van de Ven const struct file_operations *i_fop; 4637364af6aSTrond Myklebust umode_t mode; 4641da177e4SLinus Torvalds }; 4651da177e4SLinus Torvalds 46654281548STrond Myklebust struct vfsmount *rpc_get_mount(void) 4671da177e4SLinus Torvalds { 46854281548STrond Myklebust int err; 46954281548STrond Myklebust 470fc14f2feSAl Viro err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); 47154281548STrond Myklebust if (err != 0) 47254281548STrond Myklebust return ERR_PTR(err); 473fc14f2feSAl Viro return rpc_mnt; 4741da177e4SLinus Torvalds } 475e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_get_mount); 4761da177e4SLinus Torvalds 47754281548STrond Myklebust void rpc_put_mount(void) 4781da177e4SLinus Torvalds { 479fc14f2feSAl Viro simple_release_fs(&rpc_mnt, &rpc_mount_count); 4801da177e4SLinus Torvalds } 481e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_put_mount); 4821da177e4SLinus Torvalds 483fe15ce44SNick Piggin static int rpc_delete_dentry(const struct dentry *dentry) 48462e1761cSTrond Myklebust { 48562e1761cSTrond Myklebust return 1; 48662e1761cSTrond Myklebust } 48762e1761cSTrond Myklebust 4883ba13d17SAl Viro static const struct dentry_operations rpc_dentry_operations = { 48962e1761cSTrond Myklebust .d_delete = rpc_delete_dentry, 49062e1761cSTrond Myklebust }; 49162e1761cSTrond Myklebust 4921da177e4SLinus Torvalds static struct inode * 4937364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4941da177e4SLinus Torvalds { 4951da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4961da177e4SLinus Torvalds if (!inode) 4971da177e4SLinus Torvalds return NULL; 49885fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4991da177e4SLinus Torvalds inode->i_mode = mode; 5001da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5011da177e4SLinus Torvalds switch (mode & S_IFMT) { 5021da177e4SLinus Torvalds case S_IFDIR: 5031da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 5041da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 505d8c76e6fSDave Hansen inc_nlink(inode); 5061da177e4SLinus Torvalds default: 5071da177e4SLinus Torvalds break; 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds return inode; 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 5127589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 5137589806eSTrond Myklebust umode_t mode, 5147589806eSTrond Myklebust const struct file_operations *i_fop, 5157589806eSTrond Myklebust void *private) 5167589806eSTrond Myklebust { 5177589806eSTrond Myklebust struct inode *inode; 5187589806eSTrond Myklebust 519beb0f0a9STrond Myklebust d_drop(dentry); 5207589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 5217589806eSTrond Myklebust if (!inode) 5227589806eSTrond Myklebust goto out_err; 5237589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 5247589806eSTrond Myklebust if (i_fop) 5257589806eSTrond Myklebust inode->i_fop = i_fop; 5267589806eSTrond Myklebust if (private) 5277589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5287589806eSTrond Myklebust d_add(dentry, inode); 5297589806eSTrond Myklebust return 0; 5307589806eSTrond Myklebust out_err: 5317589806eSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 5327589806eSTrond Myklebust __FILE__, __func__, dentry->d_name.name); 5337589806eSTrond Myklebust dput(dentry); 5347589806eSTrond Myklebust return -ENOMEM; 5357589806eSTrond Myklebust } 5367589806eSTrond Myklebust 537ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 538ac6feceeSTrond Myklebust umode_t mode, 539ac6feceeSTrond Myklebust const struct file_operations *i_fop, 540ac6feceeSTrond Myklebust void *private) 541ac6feceeSTrond Myklebust { 542ac6feceeSTrond Myklebust int err; 543ac6feceeSTrond Myklebust 544ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 545ac6feceeSTrond Myklebust if (err) 546ac6feceeSTrond Myklebust return err; 547ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 548ac6feceeSTrond Myklebust return 0; 549ac6feceeSTrond Myklebust } 550ac6feceeSTrond Myklebust 5517589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5527589806eSTrond Myklebust umode_t mode, 5537589806eSTrond Myklebust const struct file_operations *i_fop, 5547589806eSTrond Myklebust void *private) 5557589806eSTrond Myklebust { 5567589806eSTrond Myklebust int err; 5577589806eSTrond Myklebust 5587589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5597589806eSTrond Myklebust if (err) 5607589806eSTrond Myklebust return err; 5617589806eSTrond Myklebust inc_nlink(dir); 5627589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5637589806eSTrond Myklebust return 0; 5647589806eSTrond Myklebust } 5657589806eSTrond Myklebust 566ba9e0975SStanislav Kinsbursky static void 567ba9e0975SStanislav Kinsbursky init_pipe(struct rpc_pipe *pipe) 568ba9e0975SStanislav Kinsbursky { 569ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 570ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 571ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_upcall); 572ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_downcall); 573ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->pipe); 574ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 575ba9e0975SStanislav Kinsbursky init_waitqueue_head(&pipe->waitq); 576ba9e0975SStanislav Kinsbursky INIT_DELAYED_WORK(&pipe->queue_timeout, 577ba9e0975SStanislav Kinsbursky rpc_timeout_upcall_queue); 578ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 579ba9e0975SStanislav Kinsbursky spin_lock_init(&pipe->lock); 580ba9e0975SStanislav Kinsbursky 581ba9e0975SStanislav Kinsbursky } 582ba9e0975SStanislav Kinsbursky 5837589806eSTrond Myklebust static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, 5847589806eSTrond Myklebust umode_t mode, 5857589806eSTrond Myklebust const struct file_operations *i_fop, 5867589806eSTrond Myklebust void *private, 5877589806eSTrond Myklebust const struct rpc_pipe_ops *ops, 5887589806eSTrond Myklebust int flags) 5897589806eSTrond Myklebust { 590ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe; 5917589806eSTrond Myklebust struct rpc_inode *rpci; 5927589806eSTrond Myklebust int err; 5937589806eSTrond Myklebust 594ba9e0975SStanislav Kinsbursky pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); 595ba9e0975SStanislav Kinsbursky if (!pipe) 596ba9e0975SStanislav Kinsbursky return -ENOMEM; 597ba9e0975SStanislav Kinsbursky init_pipe(pipe); 5987589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 599ba9e0975SStanislav Kinsbursky if (err) { 600ba9e0975SStanislav Kinsbursky kfree(pipe); 6017589806eSTrond Myklebust return err; 602ba9e0975SStanislav Kinsbursky } 6037589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 6047589806eSTrond Myklebust rpci->private = private; 605ba9e0975SStanislav Kinsbursky rpci->pipe = pipe; 606ba9e0975SStanislav Kinsbursky rpci->pipe->flags = flags; 607ba9e0975SStanislav Kinsbursky rpci->pipe->ops = ops; 6087589806eSTrond Myklebust fsnotify_create(dir, dentry); 6097589806eSTrond Myklebust return 0; 6107589806eSTrond Myklebust } 6117589806eSTrond Myklebust 612ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 613ac6feceeSTrond Myklebust { 614ac6feceeSTrond Myklebust int ret; 615ac6feceeSTrond Myklebust 616ac6feceeSTrond Myklebust dget(dentry); 617ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 618ac6feceeSTrond Myklebust d_delete(dentry); 619ac6feceeSTrond Myklebust dput(dentry); 620ac6feceeSTrond Myklebust return ret; 621ac6feceeSTrond Myklebust } 622ac6feceeSTrond Myklebust 623810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 624810d90bcSTrond Myklebust { 625810d90bcSTrond Myklebust int ret; 626810d90bcSTrond Myklebust 627810d90bcSTrond Myklebust dget(dentry); 628810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 629810d90bcSTrond Myklebust d_delete(dentry); 630810d90bcSTrond Myklebust dput(dentry); 631810d90bcSTrond Myklebust return ret; 632810d90bcSTrond Myklebust } 633810d90bcSTrond Myklebust 634810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 635810d90bcSTrond Myklebust { 636810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 637810d90bcSTrond Myklebust 638810d90bcSTrond Myklebust rpc_close_pipes(inode); 639810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 640810d90bcSTrond Myklebust } 641810d90bcSTrond Myklebust 642cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 643cfeaa4a3STrond Myklebust struct qstr *name) 644cfeaa4a3STrond Myklebust { 645cfeaa4a3STrond Myklebust struct dentry *dentry; 646cfeaa4a3STrond Myklebust 6475bff0386SStanislav Kinsbursky dentry = d_lookup(parent, name); 6485bff0386SStanislav Kinsbursky if (!dentry) { 6495bff0386SStanislav Kinsbursky dentry = d_alloc(parent, name); 6505bff0386SStanislav Kinsbursky if (!dentry) 6515bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6525bff0386SStanislav Kinsbursky } 6535bff0386SStanislav Kinsbursky if (dentry->d_inode == NULL) { 6545bff0386SStanislav Kinsbursky d_set_d_op(dentry, &rpc_dentry_operations); 655f1f0abe1SDan Carpenter return dentry; 6565bff0386SStanislav Kinsbursky } 657cfeaa4a3STrond Myklebust dput(dentry); 658cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 659cfeaa4a3STrond Myklebust } 660cfeaa4a3STrond Myklebust 6611da177e4SLinus Torvalds /* 6621da177e4SLinus Torvalds * FIXME: This probably has races. 6631da177e4SLinus Torvalds */ 664ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 665ac6feceeSTrond Myklebust const struct rpc_filelist *files, 666ac6feceeSTrond Myklebust int start, int eof) 6671da177e4SLinus Torvalds { 6681da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 669ac6feceeSTrond Myklebust struct dentry *dentry; 670ac6feceeSTrond Myklebust struct qstr name; 671ac6feceeSTrond Myklebust int i; 672ac6feceeSTrond Myklebust 673ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 674ac6feceeSTrond Myklebust name.name = files[i].name; 675ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 676ac6feceeSTrond Myklebust name.hash = full_name_hash(name.name, name.len); 677ac6feceeSTrond Myklebust dentry = d_lookup(parent, &name); 678ac6feceeSTrond Myklebust 679ac6feceeSTrond Myklebust if (dentry == NULL) 680ac6feceeSTrond Myklebust continue; 681ac6feceeSTrond Myklebust if (dentry->d_inode == NULL) 682ac6feceeSTrond Myklebust goto next; 683ac6feceeSTrond Myklebust switch (dentry->d_inode->i_mode & S_IFMT) { 684ac6feceeSTrond Myklebust default: 685ac6feceeSTrond Myklebust BUG(); 686ac6feceeSTrond Myklebust case S_IFREG: 687ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 688ac6feceeSTrond Myklebust break; 689ac6feceeSTrond Myklebust case S_IFDIR: 690ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 691ac6feceeSTrond Myklebust } 692ac6feceeSTrond Myklebust next: 693ac6feceeSTrond Myklebust dput(dentry); 694ac6feceeSTrond Myklebust } 695ac6feceeSTrond Myklebust } 696ac6feceeSTrond Myklebust 697ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 698ac6feceeSTrond Myklebust const struct rpc_filelist *files, 699ac6feceeSTrond Myklebust int start, int eof) 700ac6feceeSTrond Myklebust { 701ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7021da177e4SLinus Torvalds 703c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); 704ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7051b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 708ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 709ac6feceeSTrond Myklebust const struct rpc_filelist *files, 710ac6feceeSTrond Myklebust int start, int eof, 711ac6feceeSTrond Myklebust void *private) 7121da177e4SLinus Torvalds { 713ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7141da177e4SLinus Torvalds struct dentry *dentry; 715ac6feceeSTrond Myklebust int i, err; 7161da177e4SLinus Torvalds 7171b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 7181da177e4SLinus Torvalds for (i = start; i < eof; i++) { 719ac6feceeSTrond Myklebust struct qstr q; 720ac6feceeSTrond Myklebust 721ac6feceeSTrond Myklebust q.name = files[i].name; 722ac6feceeSTrond Myklebust q.len = strlen(files[i].name); 723ac6feceeSTrond Myklebust q.hash = full_name_hash(q.name, q.len); 724ac6feceeSTrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, &q); 725ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 726ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 7271da177e4SLinus Torvalds goto out_bad; 728ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 729ac6feceeSTrond Myklebust default: 730ac6feceeSTrond Myklebust BUG(); 731ac6feceeSTrond Myklebust case S_IFREG: 732ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 733ac6feceeSTrond Myklebust files[i].mode, 734ac6feceeSTrond Myklebust files[i].i_fop, 735ac6feceeSTrond Myklebust private); 736ac6feceeSTrond Myklebust break; 737ac6feceeSTrond Myklebust case S_IFDIR: 738ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 739ac6feceeSTrond Myklebust files[i].mode, 740ac6feceeSTrond Myklebust NULL, 741ac6feceeSTrond Myklebust private); 7421da177e4SLinus Torvalds } 743ac6feceeSTrond Myklebust if (err != 0) 744ac6feceeSTrond Myklebust goto out_bad; 7451da177e4SLinus Torvalds } 7461b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7471da177e4SLinus Torvalds return 0; 7481da177e4SLinus Torvalds out_bad: 749ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7501b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7511da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 7520dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name); 753ac6feceeSTrond Myklebust return err; 754f134585aSTrond Myklebust } 755f134585aSTrond Myklebust 756e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 757e57aed77STrond Myklebust struct qstr *name, umode_t mode, void *private, 758e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 759f134585aSTrond Myklebust { 760f134585aSTrond Myklebust struct dentry *dentry; 7617d59d1e8STrond Myklebust struct inode *dir = parent->d_inode; 762f134585aSTrond Myklebust int error; 763f134585aSTrond Myklebust 7647d59d1e8STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 7657d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 766f134585aSTrond Myklebust if (IS_ERR(dentry)) 7677d59d1e8STrond Myklebust goto out; 7687d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7697589806eSTrond Myklebust if (error != 0) 7707589806eSTrond Myklebust goto out_err; 771e57aed77STrond Myklebust if (populate != NULL) { 772e57aed77STrond Myklebust error = populate(dentry, args_populate); 773f134585aSTrond Myklebust if (error) 774ac6feceeSTrond Myklebust goto err_rmdir; 775e57aed77STrond Myklebust } 776f134585aSTrond Myklebust out: 7771b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7785c3e985aSTrond Myklebust return dentry; 779ac6feceeSTrond Myklebust err_rmdir: 780f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7817589806eSTrond Myklebust out_err: 782f134585aSTrond Myklebust dentry = ERR_PTR(error); 783f134585aSTrond Myklebust goto out; 784f134585aSTrond Myklebust } 785f134585aSTrond Myklebust 786e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 787e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 788f134585aSTrond Myklebust { 789dff02cc1STrond Myklebust struct dentry *parent; 790f134585aSTrond Myklebust struct inode *dir; 791f134585aSTrond Myklebust int error; 792f134585aSTrond Myklebust 793dff02cc1STrond Myklebust parent = dget_parent(dentry); 794dff02cc1STrond Myklebust dir = parent->d_inode; 795c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 796e57aed77STrond Myklebust if (depopulate != NULL) 797e57aed77STrond Myklebust depopulate(dentry); 798f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 7991b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 800dff02cc1STrond Myklebust dput(parent); 801f134585aSTrond Myklebust return error; 802f134585aSTrond Myklebust } 8031da177e4SLinus Torvalds 80493a44a75SJ. Bruce Fields /** 80593a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 80693a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 80793a44a75SJ. Bruce Fields * @name: name of pipe 80893a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 80993a44a75SJ. Bruce Fields * @ops: operations defining the behavior of the pipe: upcall, downcall, 810c3810608S\"J. Bruce Fields\ * release_pipe, open_pipe, and destroy_msg. 81165b6e42cSRandy Dunlap * @flags: rpc_inode flags 81293a44a75SJ. Bruce Fields * 81393a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 81493a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 81593a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 81693a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 81793a44a75SJ. Bruce Fields * 81893a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 81993a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 82093a44a75SJ. Bruce Fields * 82193a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 82293a44a75SJ. Bruce Fields * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. 82393a44a75SJ. Bruce Fields */ 824b693ba4aSTrond Myklebust struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, 825b693ba4aSTrond Myklebust void *private, const struct rpc_pipe_ops *ops, 826b693ba4aSTrond Myklebust int flags) 8271da177e4SLinus Torvalds { 8281da177e4SLinus Torvalds struct dentry *dentry; 8297589806eSTrond Myklebust struct inode *dir = parent->d_inode; 8307364af6aSTrond Myklebust umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; 831cfeaa4a3STrond Myklebust struct qstr q; 8327589806eSTrond Myklebust int err; 8337364af6aSTrond Myklebust 8347364af6aSTrond Myklebust if (ops->upcall == NULL) 8357364af6aSTrond Myklebust umode &= ~S_IRUGO; 8367364af6aSTrond Myklebust if (ops->downcall == NULL) 8377364af6aSTrond Myklebust umode &= ~S_IWUGO; 8381da177e4SLinus Torvalds 839cfeaa4a3STrond Myklebust q.name = name; 840cfeaa4a3STrond Myklebust q.len = strlen(name); 841cfeaa4a3STrond Myklebust q.hash = full_name_hash(q.name, q.len), 842cfeaa4a3STrond Myklebust 843cfeaa4a3STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 8445bff0386SStanislav Kinsbursky dentry = __rpc_lookup_create_exclusive(parent, &q); 8451da177e4SLinus Torvalds if (IS_ERR(dentry)) 846cfeaa4a3STrond Myklebust goto out; 8477589806eSTrond Myklebust err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, 8487589806eSTrond Myklebust private, ops, flags); 8497589806eSTrond Myklebust if (err) 8507589806eSTrond Myklebust goto out_err; 851f134585aSTrond Myklebust out: 8521b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8535c3e985aSTrond Myklebust return dentry; 8547589806eSTrond Myklebust out_err: 8557589806eSTrond Myklebust dentry = ERR_PTR(err); 856158998b6STrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", 8570dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name, name, 8587589806eSTrond Myklebust err); 859f134585aSTrond Myklebust goto out; 8601da177e4SLinus Torvalds } 861468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_mkpipe); 8621da177e4SLinus Torvalds 86393a44a75SJ. Bruce Fields /** 86493a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 86593a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 86693a44a75SJ. Bruce Fields * 86793a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 86893a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 86993a44a75SJ. Bruce Fields * return -EPIPE. 87093a44a75SJ. Bruce Fields */ 871f134585aSTrond Myklebust int 8725d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8731da177e4SLinus Torvalds { 8745d67476fSTrond Myklebust struct dentry *parent; 875f134585aSTrond Myklebust struct inode *dir; 8765d67476fSTrond Myklebust int error = 0; 8771da177e4SLinus Torvalds 8785d67476fSTrond Myklebust parent = dget_parent(dentry); 8795d67476fSTrond Myklebust dir = parent->d_inode; 880c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 881810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8821b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8835d67476fSTrond Myklebust dput(parent); 884f134585aSTrond Myklebust return error; 8851da177e4SLinus Torvalds } 886468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8871da177e4SLinus Torvalds 888e57aed77STrond Myklebust enum { 889e57aed77STrond Myklebust RPCAUTH_info, 890e57aed77STrond Myklebust RPCAUTH_EOF 891e57aed77STrond Myklebust }; 892e57aed77STrond Myklebust 893e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 894e57aed77STrond Myklebust [RPCAUTH_info] = { 895e57aed77STrond Myklebust .name = "info", 896e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 897e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 898e57aed77STrond Myklebust }, 899e57aed77STrond Myklebust }; 900e57aed77STrond Myklebust 901e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 902e57aed77STrond Myklebust { 903e57aed77STrond Myklebust return rpc_populate(dentry, 904e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 905e57aed77STrond Myklebust private); 906e57aed77STrond Myklebust } 907e57aed77STrond Myklebust 908e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 909e57aed77STrond Myklebust { 910e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 911e57aed77STrond Myklebust } 912e57aed77STrond Myklebust 9137d59d1e8STrond Myklebust /** 9147d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 9154111d4fdSRandy Dunlap * @dentry: dentry from the rpc_pipefs root to the new directory 9164111d4fdSRandy Dunlap * @name: &struct qstr for the name 9177d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 9187d59d1e8STrond Myklebust * 9197d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 9207d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 9217d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 9227d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 9237d59d1e8STrond Myklebust */ 92423ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 92523ac6581STrond Myklebust struct qstr *name, 9267d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 9277d59d1e8STrond Myklebust { 928e57aed77STrond Myklebust return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 929e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 930e57aed77STrond Myklebust } 931e57aed77STrond Myklebust 932e57aed77STrond Myklebust /** 933e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 934e57aed77STrond Myklebust * @dentry: directory to remove 935e57aed77STrond Myklebust */ 936e57aed77STrond Myklebust int rpc_remove_client_dir(struct dentry *dentry) 937e57aed77STrond Myklebust { 938e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 9397d59d1e8STrond Myklebust } 9407d59d1e8STrond Myklebust 9418854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 9428854e82dSTrond Myklebust [0] = { 9438854e82dSTrond Myklebust .name = "channel", 9448854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 94596c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9468854e82dSTrond Myklebust }, 9478854e82dSTrond Myklebust [1] = { 9488854e82dSTrond Myklebust .name = "content", 9498854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 9508854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 9518854e82dSTrond Myklebust }, 9528854e82dSTrond Myklebust [2] = { 9538854e82dSTrond Myklebust .name = "flush", 9548854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 9558854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9568854e82dSTrond Myklebust }, 9578854e82dSTrond Myklebust }; 9588854e82dSTrond Myklebust 9598854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 9608854e82dSTrond Myklebust { 9618854e82dSTrond Myklebust return rpc_populate(dentry, 9628854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 9638854e82dSTrond Myklebust private); 9648854e82dSTrond Myklebust } 9658854e82dSTrond Myklebust 9668854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 9678854e82dSTrond Myklebust { 9688854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 9698854e82dSTrond Myklebust } 9708854e82dSTrond Myklebust 9718854e82dSTrond Myklebust struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, 97264f1426fSAl Viro umode_t umode, struct cache_detail *cd) 9738854e82dSTrond Myklebust { 9748854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 9758854e82dSTrond Myklebust rpc_cachedir_populate, cd); 9768854e82dSTrond Myklebust } 9778854e82dSTrond Myklebust 9788854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 9798854e82dSTrond Myklebust { 9808854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 9818854e82dSTrond Myklebust } 9828854e82dSTrond Myklebust 9831da177e4SLinus Torvalds /* 9841da177e4SLinus Torvalds * populate the filesystem 9851da177e4SLinus Torvalds */ 986b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 9871da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 9881da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 9891da177e4SLinus Torvalds .statfs = simple_statfs, 9901da177e4SLinus Torvalds }; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 9931da177e4SLinus Torvalds 994bb156749STrond Myklebust /* 995bb156749STrond Myklebust * We have a single directory with 1 node in it. 996bb156749STrond Myklebust */ 997bb156749STrond Myklebust enum { 998bb156749STrond Myklebust RPCAUTH_lockd, 999bb156749STrond Myklebust RPCAUTH_mount, 1000bb156749STrond Myklebust RPCAUTH_nfs, 1001bb156749STrond Myklebust RPCAUTH_portmap, 1002bb156749STrond Myklebust RPCAUTH_statd, 1003bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 1004e571cbf1STrond Myklebust RPCAUTH_cache, 1005bb156749STrond Myklebust RPCAUTH_RootEOF 1006bb156749STrond Myklebust }; 1007bb156749STrond Myklebust 1008bb156749STrond Myklebust static const struct rpc_filelist files[] = { 1009bb156749STrond Myklebust [RPCAUTH_lockd] = { 1010bb156749STrond Myklebust .name = "lockd", 1011bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1012bb156749STrond Myklebust }, 1013bb156749STrond Myklebust [RPCAUTH_mount] = { 1014bb156749STrond Myklebust .name = "mount", 1015bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1016bb156749STrond Myklebust }, 1017bb156749STrond Myklebust [RPCAUTH_nfs] = { 1018bb156749STrond Myklebust .name = "nfs", 1019bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1020bb156749STrond Myklebust }, 1021bb156749STrond Myklebust [RPCAUTH_portmap] = { 1022bb156749STrond Myklebust .name = "portmap", 1023bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1024bb156749STrond Myklebust }, 1025bb156749STrond Myklebust [RPCAUTH_statd] = { 1026bb156749STrond Myklebust .name = "statd", 1027bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1028bb156749STrond Myklebust }, 1029bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 1030bb156749STrond Myklebust .name = "nfsd4_cb", 1031bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1032bb156749STrond Myklebust }, 1033e571cbf1STrond Myklebust [RPCAUTH_cache] = { 1034e571cbf1STrond Myklebust .name = "cache", 1035e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1036e571cbf1STrond Myklebust }, 1037bb156749STrond Myklebust }; 1038bb156749STrond Myklebust 1039432eb1a5SStanislav Kinsbursky /* 1040432eb1a5SStanislav Kinsbursky * This call can be used only in RPC pipefs mount notification hooks. 1041432eb1a5SStanislav Kinsbursky */ 1042432eb1a5SStanislav Kinsbursky struct dentry *rpc_d_lookup_sb(const struct super_block *sb, 1043432eb1a5SStanislav Kinsbursky const unsigned char *dir_name) 1044432eb1a5SStanislav Kinsbursky { 1045432eb1a5SStanislav Kinsbursky struct qstr dir = { 1046432eb1a5SStanislav Kinsbursky .name = dir_name, 1047432eb1a5SStanislav Kinsbursky .len = strlen(dir_name), 1048432eb1a5SStanislav Kinsbursky .hash = full_name_hash(dir_name, strlen(dir_name)), 1049432eb1a5SStanislav Kinsbursky }; 1050432eb1a5SStanislav Kinsbursky 1051432eb1a5SStanislav Kinsbursky return d_lookup(sb->s_root, &dir); 1052432eb1a5SStanislav Kinsbursky } 1053432eb1a5SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 1054432eb1a5SStanislav Kinsbursky 1055c21a588fSStanislav Kinsbursky void rpc_pipefs_init_net(struct net *net) 1056c21a588fSStanislav Kinsbursky { 1057c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1058c21a588fSStanislav Kinsbursky 1059c21a588fSStanislav Kinsbursky mutex_init(&sn->pipefs_sb_lock); 1060c21a588fSStanislav Kinsbursky } 1061c21a588fSStanislav Kinsbursky 1062c21a588fSStanislav Kinsbursky /* 1063c21a588fSStanislav Kinsbursky * This call will be used for per network namespace operations calls. 1064c21a588fSStanislav Kinsbursky * Note: Function will be returned with pipefs_sb_lock taken if superblock was 1065c21a588fSStanislav Kinsbursky * found. This lock have to be released by rpc_put_sb_net() when all operations 1066c21a588fSStanislav Kinsbursky * will be completed. 1067c21a588fSStanislav Kinsbursky */ 1068c21a588fSStanislav Kinsbursky struct super_block *rpc_get_sb_net(const struct net *net) 1069c21a588fSStanislav Kinsbursky { 1070c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1071c21a588fSStanislav Kinsbursky 1072c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1073c21a588fSStanislav Kinsbursky if (sn->pipefs_sb) 1074c21a588fSStanislav Kinsbursky return sn->pipefs_sb; 1075c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1076c21a588fSStanislav Kinsbursky return NULL; 1077c21a588fSStanislav Kinsbursky } 1078c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_get_sb_net); 1079c21a588fSStanislav Kinsbursky 1080c21a588fSStanislav Kinsbursky void rpc_put_sb_net(const struct net *net) 1081c21a588fSStanislav Kinsbursky { 1082c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1083c21a588fSStanislav Kinsbursky 1084c21a588fSStanislav Kinsbursky BUG_ON(sn->pipefs_sb == NULL); 1085c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1086c21a588fSStanislav Kinsbursky } 1087c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_put_sb_net); 1088c21a588fSStanislav Kinsbursky 10891da177e4SLinus Torvalds static int 10901da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 10911da177e4SLinus Torvalds { 10921da177e4SLinus Torvalds struct inode *inode; 10931da177e4SLinus Torvalds struct dentry *root; 109438b0da75SStanislav Kinsbursky struct net *net = data; 109590c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 10962d00131aSStanislav Kinsbursky int err; 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 10991da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 11001da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 11011da177e4SLinus Torvalds sb->s_op = &s_ops; 11021da177e4SLinus Torvalds sb->s_time_gran = 1; 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 11051da177e4SLinus Torvalds if (!inode) 11061da177e4SLinus Torvalds return -ENOMEM; 1107fc7bed8cSAl Viro sb->s_root = root = d_alloc_root(inode); 11081da177e4SLinus Torvalds if (!root) { 11091da177e4SLinus Torvalds iput(inode); 11101da177e4SLinus Torvalds return -ENOMEM; 11111da177e4SLinus Torvalds } 1112ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 11131da177e4SLinus Torvalds return -ENOMEM; 1114efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, 1115efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11162d00131aSStanislav Kinsbursky err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11172d00131aSStanislav Kinsbursky RPC_PIPEFS_MOUNT, 11182d00131aSStanislav Kinsbursky sb); 11192d00131aSStanislav Kinsbursky if (err) 11202d00131aSStanislav Kinsbursky goto err_depopulate; 1121021c68deSStanislav Kinsbursky sb->s_fs_info = get_net(net); 112290c4e829SStanislav Kinsbursky sn->pipefs_sb = sb; 1123fc7bed8cSAl Viro return 0; 11242d00131aSStanislav Kinsbursky 11252d00131aSStanislav Kinsbursky err_depopulate: 11262d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11272d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11282d00131aSStanislav Kinsbursky sb); 11292d00131aSStanislav Kinsbursky __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 11302d00131aSStanislav Kinsbursky return err; 11311da177e4SLinus Torvalds } 11321da177e4SLinus Torvalds 1133fc14f2feSAl Viro static struct dentry * 1134fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1135fc14f2feSAl Viro int flags, const char *dev_name, void *data) 11361da177e4SLinus Torvalds { 113738b0da75SStanislav Kinsbursky return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); 11381da177e4SLinus Torvalds } 11391da177e4SLinus Torvalds 1140021c68deSStanislav Kinsbursky void rpc_kill_sb(struct super_block *sb) 1141021c68deSStanislav Kinsbursky { 1142021c68deSStanislav Kinsbursky struct net *net = sb->s_fs_info; 114390c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1144021c68deSStanislav Kinsbursky 1145c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 114690c4e829SStanislav Kinsbursky sn->pipefs_sb = NULL; 1147c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1148021c68deSStanislav Kinsbursky put_net(net); 1149efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, 1150efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11512d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11522d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11532d00131aSStanislav Kinsbursky sb); 1154021c68deSStanislav Kinsbursky kill_litter_super(sb); 1155021c68deSStanislav Kinsbursky } 1156021c68deSStanislav Kinsbursky 11571da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 11581da177e4SLinus Torvalds .owner = THIS_MODULE, 11591da177e4SLinus Torvalds .name = "rpc_pipefs", 1160fc14f2feSAl Viro .mount = rpc_mount, 1161021c68deSStanislav Kinsbursky .kill_sb = rpc_kill_sb, 11621da177e4SLinus Torvalds }; 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds static void 116551cc5068SAlexey Dobriyan init_once(void *foo) 11661da177e4SLinus Torvalds { 11671da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 11681da177e4SLinus Torvalds 11691da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 11701da177e4SLinus Torvalds rpci->private = NULL; 1171ba9e0975SStanislav Kinsbursky rpci->pipe = NULL; 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds int register_rpc_pipefs(void) 11751da177e4SLinus Torvalds { 11765bd5f581SAkinobu Mita int err; 11775bd5f581SAkinobu Mita 11781da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 11791da177e4SLinus Torvalds sizeof(struct rpc_inode), 1180fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1181fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 118220c2df83SPaul Mundt init_once); 11831da177e4SLinus Torvalds if (!rpc_inode_cachep) 11841da177e4SLinus Torvalds return -ENOMEM; 11855bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 11865bd5f581SAkinobu Mita if (err) { 11875bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 11885bd5f581SAkinobu Mita return err; 11895bd5f581SAkinobu Mita } 11905bd5f581SAkinobu Mita 11911da177e4SLinus Torvalds return 0; 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 11951da177e4SLinus Torvalds { 11961a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 11971da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 11981da177e4SLinus Torvalds } 1199dcbf8c30SMichal Schmidt 1200dcbf8c30SMichal Schmidt /* Make 'mount -t rpc_pipefs ...' autoload this module. */ 1201dcbf8c30SMichal Schmidt MODULE_ALIAS("rpc_pipefs"); 1202