1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * net/sunrpc/rpc_pipe.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Userland/kernel interface for rpcauth_gss. 61da177e4SLinus Torvalds * Code shamelessly plagiarized from fs/nfsd/nfsctl.c 7d51fe1beSRolf Eike Beer * and fs/sysfs/inode.c 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds */ 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/slab.h> 141da177e4SLinus Torvalds #include <linux/string.h> 151da177e4SLinus Torvalds #include <linux/pagemap.h> 161da177e4SLinus Torvalds #include <linux/mount.h> 17b9662f31SDavid Howells #include <linux/fs_context.h> 181da177e4SLinus Torvalds #include <linux/namei.h> 1950e437d5STrond Myklebust #include <linux/fsnotify.h> 201da177e4SLinus Torvalds #include <linux/kernel.h> 212446ab60STrond Myklebust #include <linux/rcupdate.h> 22e2f0c83aSJeff Layton #include <linux/utsname.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <asm/ioctls.h> 251da177e4SLinus Torvalds #include <linux/poll.h> 261da177e4SLinus Torvalds #include <linux/wait.h> 271da177e4SLinus Torvalds #include <linux/seq_file.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 301da177e4SLinus Torvalds #include <linux/workqueue.h> 311da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 328854e82dSTrond Myklebust #include <linux/sunrpc/cache.h> 33021c68deSStanislav Kinsbursky #include <linux/nsproxy.h> 342d00131aSStanislav Kinsbursky #include <linux/notifier.h> 351da177e4SLinus Torvalds 36021c68deSStanislav Kinsbursky #include "netns.h" 372d00131aSStanislav Kinsbursky #include "sunrpc.h" 381da177e4SLinus Torvalds 39efc46bf2SStanislav Kinsbursky #define RPCDBG_FACILITY RPCDBG_DEBUG 40efc46bf2SStanislav Kinsbursky 41efc46bf2SStanislav Kinsbursky #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 444b9a445eSJeff Layton static const struct rpc_pipe_ops gssd_dummy_pipe_ops; 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 { 54260a2679SXiaoming Ni return blocking_notifier_chain_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 64591ad7feSStanislav Kinsbursky static void rpc_purge_list(wait_queue_head_t *waitq, 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)); 7792123e06SJeff Layton 7892123e06SJeff Layton if (waitq) 79591ad7feSStanislav Kinsbursky wake_up(waitq); 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds static void 8365f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 841da177e4SLinus Torvalds { 859842ef35STrond Myklebust LIST_HEAD(free_list); 86ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = 87ba9e0975SStanislav Kinsbursky container_of(work, struct rpc_pipe, queue_timeout.work); 889842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 89591ad7feSStanislav Kinsbursky struct dentry *dentry; 901da177e4SLinus Torvalds 91ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 92ba9e0975SStanislav Kinsbursky destroy_msg = pipe->ops->destroy_msg; 93ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 94ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 95ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 969842ef35STrond Myklebust } 97591ad7feSStanislav Kinsbursky dentry = dget(pipe->dentry); 98ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 99c5ef6035SDavid Howells rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL, 100591ad7feSStanislav Kinsbursky &free_list, destroy_msg, -ETIMEDOUT); 101591ad7feSStanislav Kinsbursky dput(dentry); 1029842ef35STrond Myklebust } 1031da177e4SLinus Torvalds 104c1225158SPeng Tao ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, 105c1225158SPeng Tao char __user *dst, size_t buflen) 106c1225158SPeng Tao { 107c1225158SPeng Tao char *data = (char *)msg->data + msg->copied; 108c1225158SPeng Tao size_t mlen = min(msg->len - msg->copied, buflen); 109c1225158SPeng Tao unsigned long left; 110c1225158SPeng Tao 111c1225158SPeng Tao left = copy_to_user(dst, data, mlen); 112c1225158SPeng Tao if (left == mlen) { 113c1225158SPeng Tao msg->errno = -EFAULT; 114c1225158SPeng Tao return -EFAULT; 115c1225158SPeng Tao } 116c1225158SPeng Tao 117c1225158SPeng Tao mlen -= left; 118c1225158SPeng Tao msg->copied += mlen; 119c1225158SPeng Tao msg->errno = 0; 120c1225158SPeng Tao return mlen; 121c1225158SPeng Tao } 122c1225158SPeng Tao EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 123c1225158SPeng Tao 12493a44a75SJ. Bruce Fields /** 1251a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 126bda14606SRandy Dunlap * @pipe: upcall pipe on which to queue given message 12793a44a75SJ. Bruce Fields * @msg: message to queue 12893a44a75SJ. Bruce Fields * 12993a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 13093a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 13193a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 13293a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 13393a44a75SJ. Bruce Fields */ 1341da177e4SLinus Torvalds int 135d706ed1fSStanislav Kinsbursky rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) 1361da177e4SLinus Torvalds { 1376070fe6fSTrond Myklebust int res = -EPIPE; 138591ad7feSStanislav Kinsbursky struct dentry *dentry; 1391da177e4SLinus Torvalds 140d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 141d0fe13baSStanislav Kinsbursky if (pipe->nreaders) { 142d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 143d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1446070fe6fSTrond Myklebust res = 0; 145d0fe13baSStanislav Kinsbursky } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { 146d0fe13baSStanislav Kinsbursky if (list_empty(&pipe->pipe)) 14724c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 148d0fe13baSStanislav Kinsbursky &pipe->queue_timeout, 1491da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 150d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 151d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1526070fe6fSTrond Myklebust res = 0; 1536070fe6fSTrond Myklebust } 154591ad7feSStanislav Kinsbursky dentry = dget(pipe->dentry); 155d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 156591ad7feSStanislav Kinsbursky if (dentry) { 157c5ef6035SDavid Howells wake_up(&RPC_I(d_inode(dentry))->waitq); 158591ad7feSStanislav Kinsbursky dput(dentry); 159591ad7feSStanislav Kinsbursky } 1601da177e4SLinus Torvalds return res; 1611da177e4SLinus Torvalds } 162468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1631da177e4SLinus Torvalds 1646070fe6fSTrond Myklebust static inline void 1656070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1666070fe6fSTrond Myklebust { 1676070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1686070fe6fSTrond Myklebust } 1696070fe6fSTrond Myklebust 1701da177e4SLinus Torvalds static void 1711da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1721da177e4SLinus Torvalds { 173ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 174e712804aS\"J. Bruce Fields\ int need_release; 175ad6b1340SStanislav Kinsbursky LIST_HEAD(free_list); 1761da177e4SLinus Torvalds 1775955102cSAl Viro inode_lock(inode); 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; 184ad6b1340SStanislav Kinsbursky pipe->dentry = NULL; 185ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 186591ad7feSStanislav Kinsbursky rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); 187ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 188ad6b1340SStanislav Kinsbursky if (need_release && pipe->ops->release_pipe) 189ad6b1340SStanislav Kinsbursky pipe->ops->release_pipe(inode); 190ba9e0975SStanislav Kinsbursky cancel_delayed_work_sync(&pipe->queue_timeout); 1916070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1922c9030eeSStanislav Kinsbursky RPC_I(inode)->pipe = NULL; 1935955102cSAl Viro inode_unlock(inode); 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; 200adcda652SHimangi Saraogi rpci = 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 207bef252faSAl Viro rpc_free_inode(struct inode *inode) 208fa0d7e3dSNick Piggin { 209fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 210fa0d7e3dSNick Piggin } 211fa0d7e3dSNick Piggin 2121da177e4SLinus Torvalds static int 2131da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 2141da177e4SLinus Torvalds { 2152c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 216c3810608S\"J. Bruce Fields\ int first_open; 2171da177e4SLinus Torvalds int res = -ENXIO; 2181da177e4SLinus Torvalds 2195955102cSAl Viro inode_lock(inode); 2202c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2212c9030eeSStanislav Kinsbursky if (pipe == NULL) 222c3810608S\"J. Bruce Fields\ goto out; 223d0fe13baSStanislav Kinsbursky first_open = pipe->nreaders == 0 && pipe->nwriters == 0; 224d0fe13baSStanislav Kinsbursky if (first_open && pipe->ops->open_pipe) { 225d0fe13baSStanislav Kinsbursky res = pipe->ops->open_pipe(inode); 226c3810608S\"J. Bruce Fields\ if (res) 227c3810608S\"J. Bruce Fields\ goto out; 228c3810608S\"J. Bruce Fields\ } 2291da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 230d0fe13baSStanislav Kinsbursky pipe->nreaders++; 2311da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 232d0fe13baSStanislav Kinsbursky pipe->nwriters++; 2331da177e4SLinus Torvalds res = 0; 234c3810608S\"J. Bruce Fields\ out: 2355955102cSAl Viro inode_unlock(inode); 2361da177e4SLinus Torvalds return res; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds static int 2401da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2411da177e4SLinus Torvalds { 2422c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 2431da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 244e712804aS\"J. Bruce Fields\ int last_close; 2451da177e4SLinus Torvalds 2465955102cSAl Viro inode_lock(inode); 2472c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2482c9030eeSStanislav Kinsbursky if (pipe == NULL) 2491da177e4SLinus Torvalds goto out; 250655b5bb4SJoe Perches msg = filp->private_data; 2511da177e4SLinus Torvalds if (msg != NULL) { 252ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 25348e49187STrond Myklebust msg->errno = -EAGAIN; 2545a67657aSTrond Myklebust list_del_init(&msg->list); 255ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 256ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg(msg); 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 259ba9e0975SStanislav Kinsbursky pipe->nwriters --; 2609842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 261ba9e0975SStanislav Kinsbursky pipe->nreaders --; 262ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 2639842ef35STrond Myklebust LIST_HEAD(free_list); 264ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 265ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 266ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 267ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 268591ad7feSStanislav Kinsbursky rpc_purge_list(&RPC_I(inode)->waitq, &free_list, 269ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg, -EAGAIN); 2709842ef35STrond Myklebust } 2719842ef35STrond Myklebust } 272ba9e0975SStanislav Kinsbursky last_close = pipe->nwriters == 0 && pipe->nreaders == 0; 273ba9e0975SStanislav Kinsbursky if (last_close && pipe->ops->release_pipe) 274ba9e0975SStanislav Kinsbursky pipe->ops->release_pipe(inode); 2751da177e4SLinus Torvalds out: 2765955102cSAl Viro inode_unlock(inode); 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static ssize_t 2811da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2821da177e4SLinus Torvalds { 283496ad9aaSAl Viro struct inode *inode = file_inode(filp); 2842c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 2851da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2861da177e4SLinus Torvalds int res = 0; 2871da177e4SLinus Torvalds 2885955102cSAl Viro inode_lock(inode); 2892c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2902c9030eeSStanislav Kinsbursky if (pipe == NULL) { 2911da177e4SLinus Torvalds res = -EPIPE; 2921da177e4SLinus Torvalds goto out_unlock; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds msg = filp->private_data; 2951da177e4SLinus Torvalds if (msg == NULL) { 296d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 297d0fe13baSStanislav Kinsbursky if (!list_empty(&pipe->pipe)) { 298d0fe13baSStanislav Kinsbursky msg = list_entry(pipe->pipe.next, 2991da177e4SLinus Torvalds struct rpc_pipe_msg, 3001da177e4SLinus Torvalds list); 301d0fe13baSStanislav Kinsbursky list_move(&msg->list, &pipe->in_upcall); 302d0fe13baSStanislav Kinsbursky pipe->pipelen -= msg->len; 3031da177e4SLinus Torvalds filp->private_data = msg; 3041da177e4SLinus Torvalds msg->copied = 0; 3051da177e4SLinus Torvalds } 306d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3071da177e4SLinus Torvalds if (msg == NULL) 3081da177e4SLinus Torvalds goto out_unlock; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 311d0fe13baSStanislav Kinsbursky res = pipe->ops->upcall(filp, msg, buf, len); 3121da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 3131da177e4SLinus Torvalds filp->private_data = NULL; 314d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 3155a67657aSTrond Myklebust list_del_init(&msg->list); 316d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 317d0fe13baSStanislav Kinsbursky pipe->ops->destroy_msg(msg); 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds out_unlock: 3205955102cSAl Viro inode_unlock(inode); 3211da177e4SLinus Torvalds return res; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds static ssize_t 3251da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 3261da177e4SLinus Torvalds { 327496ad9aaSAl Viro struct inode *inode = file_inode(filp); 3281da177e4SLinus Torvalds int res; 3291da177e4SLinus Torvalds 3305955102cSAl Viro inode_lock(inode); 3311da177e4SLinus Torvalds res = -EPIPE; 3322c9030eeSStanislav Kinsbursky if (RPC_I(inode)->pipe != NULL) 3332c9030eeSStanislav Kinsbursky res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); 3345955102cSAl Viro inode_unlock(inode); 3351da177e4SLinus Torvalds return res; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 338ade994f4SAl Viro static __poll_t 3391da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3401da177e4SLinus Torvalds { 341496ad9aaSAl Viro struct inode *inode = file_inode(filp); 342591ad7feSStanislav Kinsbursky struct rpc_inode *rpci = RPC_I(inode); 343a9a08845SLinus Torvalds __poll_t mask = EPOLLOUT | EPOLLWRNORM; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 3461da177e4SLinus Torvalds 3475955102cSAl Viro inode_lock(inode); 348591ad7feSStanislav Kinsbursky if (rpci->pipe == NULL) 349a9a08845SLinus Torvalds mask |= EPOLLERR | EPOLLHUP; 350591ad7feSStanislav Kinsbursky else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) 351a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 3525955102cSAl Viro inode_unlock(inode); 3531da177e4SLinus Torvalds return mask; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 356a6f8dbc6SArnd Bergmann static long 357a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3581da177e4SLinus Torvalds { 359496ad9aaSAl Viro struct inode *inode = file_inode(filp); 3602c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 3611da177e4SLinus Torvalds int len; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds switch (cmd) { 3641da177e4SLinus Torvalds case FIONREAD: 3655955102cSAl Viro inode_lock(inode); 3662c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 3672c9030eeSStanislav Kinsbursky if (pipe == NULL) { 3685955102cSAl Viro inode_unlock(inode); 3691da177e4SLinus Torvalds return -EPIPE; 370a6f8dbc6SArnd Bergmann } 3712c9030eeSStanislav Kinsbursky spin_lock(&pipe->lock); 372d0fe13baSStanislav Kinsbursky len = pipe->pipelen; 3731da177e4SLinus Torvalds if (filp->private_data) { 3741da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 375655b5bb4SJoe Perches msg = filp->private_data; 3761da177e4SLinus Torvalds len += msg->len - msg->copied; 3771da177e4SLinus Torvalds } 378d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3795955102cSAl Viro inode_unlock(inode); 3801da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3811da177e4SLinus Torvalds default: 3821da177e4SLinus Torvalds return -EINVAL; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 386da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3871da177e4SLinus Torvalds .owner = THIS_MODULE, 3881da177e4SLinus Torvalds .llseek = no_llseek, 3891da177e4SLinus Torvalds .read = rpc_pipe_read, 3901da177e4SLinus Torvalds .write = rpc_pipe_write, 3911da177e4SLinus Torvalds .poll = rpc_pipe_poll, 392674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3931da177e4SLinus Torvalds .open = rpc_pipe_open, 3941da177e4SLinus Torvalds .release = rpc_pipe_release, 3951da177e4SLinus Torvalds }; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds static int 3981da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3991da177e4SLinus Torvalds { 4001da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 4011da177e4SLinus Torvalds 4022446ab60STrond Myklebust rcu_read_lock(); 4034e0038b6STrond Myklebust seq_printf(m, "RPC server: %s\n", 4044e0038b6STrond Myklebust rcu_dereference(clnt->cl_xprt)->servername); 40555909f21STrond Myklebust seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, 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)); 4102446ab60STrond Myklebust rcu_read_unlock(); 4111da177e4SLinus Torvalds return 0; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds static int 4151da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 4161da177e4SLinus Torvalds { 417006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 4181da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds if (!ret) { 4211da177e4SLinus Torvalds struct seq_file *m = file->private_data; 422006abe88STrond Myklebust 423006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 424006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 4251da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 426006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 427006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4281da177e4SLinus Torvalds m->private = clnt; 4291da177e4SLinus Torvalds } else { 430006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4311da177e4SLinus Torvalds single_release(inode, file); 4321da177e4SLinus Torvalds ret = -EINVAL; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds return ret; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds static int 4391da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 4401da177e4SLinus Torvalds { 4411da177e4SLinus Torvalds struct seq_file *m = file->private_data; 4421da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds if (clnt) 4451da177e4SLinus Torvalds rpc_release_client(clnt); 4461da177e4SLinus Torvalds return single_release(inode, file); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 449da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4501da177e4SLinus Torvalds .owner = THIS_MODULE, 4511da177e4SLinus Torvalds .open = rpc_info_open, 4521da177e4SLinus Torvalds .read = seq_read, 4531da177e4SLinus Torvalds .llseek = seq_lseek, 4541da177e4SLinus Torvalds .release = rpc_info_release, 4551da177e4SLinus Torvalds }; 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* 4591da177e4SLinus Torvalds * Description of fs contents. 4601da177e4SLinus Torvalds */ 4611da177e4SLinus Torvalds struct rpc_filelist { 462ac6feceeSTrond Myklebust const char *name; 46399ac48f5SArjan van de Ven const struct file_operations *i_fop; 4647364af6aSTrond Myklebust umode_t mode; 4651da177e4SLinus Torvalds }; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds static struct inode * 4687364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4711da177e4SLinus Torvalds if (!inode) 4721da177e4SLinus Torvalds return NULL; 47385fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4741da177e4SLinus Torvalds inode->i_mode = mode; 475078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 4761da177e4SLinus Torvalds switch (mode & S_IFMT) { 4771da177e4SLinus Torvalds case S_IFDIR: 4781da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 479275448ebSJeff Layton inode->i_op = &simple_dir_inode_operations; 480d8c76e6fSDave Hansen inc_nlink(inode); 4811da177e4SLinus Torvalds default: 4821da177e4SLinus Torvalds break; 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds return inode; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4877589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 4887589806eSTrond Myklebust umode_t mode, 4897589806eSTrond Myklebust const struct file_operations *i_fop, 4907589806eSTrond Myklebust void *private) 4917589806eSTrond Myklebust { 4927589806eSTrond Myklebust struct inode *inode; 4937589806eSTrond Myklebust 494beb0f0a9STrond Myklebust d_drop(dentry); 4957589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 4967589806eSTrond Myklebust if (!inode) 4977589806eSTrond Myklebust goto out_err; 4987589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 4997589806eSTrond Myklebust if (i_fop) 5007589806eSTrond Myklebust inode->i_fop = i_fop; 5017589806eSTrond Myklebust if (private) 5027589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5037589806eSTrond Myklebust d_add(dentry, inode); 5047589806eSTrond Myklebust return 0; 5057589806eSTrond Myklebust out_err: 5061e903edaSAl Viro printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", 5071e903edaSAl Viro __FILE__, __func__, dentry); 5087589806eSTrond Myklebust dput(dentry); 5097589806eSTrond Myklebust return -ENOMEM; 5107589806eSTrond Myklebust } 5117589806eSTrond Myklebust 512ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 513ac6feceeSTrond Myklebust umode_t mode, 514ac6feceeSTrond Myklebust const struct file_operations *i_fop, 515ac6feceeSTrond Myklebust void *private) 516ac6feceeSTrond Myklebust { 517ac6feceeSTrond Myklebust int err; 518ac6feceeSTrond Myklebust 519ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 520ac6feceeSTrond Myklebust if (err) 521ac6feceeSTrond Myklebust return err; 522ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 523ac6feceeSTrond Myklebust return 0; 524ac6feceeSTrond Myklebust } 525ac6feceeSTrond Myklebust 5267589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5277589806eSTrond Myklebust umode_t mode, 5287589806eSTrond Myklebust const struct file_operations *i_fop, 5297589806eSTrond Myklebust void *private) 5307589806eSTrond Myklebust { 5317589806eSTrond Myklebust int err; 5327589806eSTrond Myklebust 5337589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5347589806eSTrond Myklebust if (err) 5357589806eSTrond Myklebust return err; 5367589806eSTrond Myklebust inc_nlink(dir); 5377589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5387589806eSTrond Myklebust return 0; 5397589806eSTrond Myklebust } 5407589806eSTrond Myklebust 541ba9e0975SStanislav Kinsbursky static void 542ba9e0975SStanislav Kinsbursky init_pipe(struct rpc_pipe *pipe) 543ba9e0975SStanislav Kinsbursky { 544ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 545ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 546ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_upcall); 547ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_downcall); 548ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->pipe); 549ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 550ba9e0975SStanislav Kinsbursky INIT_DELAYED_WORK(&pipe->queue_timeout, 551ba9e0975SStanislav Kinsbursky rpc_timeout_upcall_queue); 552ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 553ba9e0975SStanislav Kinsbursky spin_lock_init(&pipe->lock); 554c239d83bSStanislav Kinsbursky pipe->dentry = NULL; 555ba9e0975SStanislav Kinsbursky } 556ba9e0975SStanislav Kinsbursky 557c239d83bSStanislav Kinsbursky void rpc_destroy_pipe_data(struct rpc_pipe *pipe) 558c239d83bSStanislav Kinsbursky { 559c239d83bSStanislav Kinsbursky kfree(pipe); 560c239d83bSStanislav Kinsbursky } 561c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); 562c239d83bSStanislav Kinsbursky 563c239d83bSStanislav Kinsbursky struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) 5647589806eSTrond Myklebust { 565ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe; 5667589806eSTrond Myklebust 567ba9e0975SStanislav Kinsbursky pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); 568ba9e0975SStanislav Kinsbursky if (!pipe) 569c239d83bSStanislav Kinsbursky return ERR_PTR(-ENOMEM); 570ba9e0975SStanislav Kinsbursky init_pipe(pipe); 571c239d83bSStanislav Kinsbursky pipe->ops = ops; 572c239d83bSStanislav Kinsbursky pipe->flags = flags; 573c239d83bSStanislav Kinsbursky return pipe; 574ba9e0975SStanislav Kinsbursky } 575c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_data); 576c239d83bSStanislav Kinsbursky 577c239d83bSStanislav Kinsbursky static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, 5787589806eSTrond Myklebust umode_t mode, 5797589806eSTrond Myklebust const struct file_operations *i_fop, 5807589806eSTrond Myklebust void *private, 581c239d83bSStanislav Kinsbursky struct rpc_pipe *pipe) 5827589806eSTrond Myklebust { 5837589806eSTrond Myklebust struct rpc_inode *rpci; 5847589806eSTrond Myklebust int err; 5857589806eSTrond Myklebust 5867589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 5877589806eSTrond Myklebust if (err) 5887589806eSTrond Myklebust return err; 589c5ef6035SDavid Howells rpci = RPC_I(d_inode(dentry)); 5907589806eSTrond Myklebust rpci->private = private; 591ba9e0975SStanislav Kinsbursky rpci->pipe = pipe; 5927589806eSTrond Myklebust fsnotify_create(dir, dentry); 5937589806eSTrond Myklebust return 0; 5947589806eSTrond Myklebust } 5957589806eSTrond Myklebust 596ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 597ac6feceeSTrond Myklebust { 598ac6feceeSTrond Myklebust int ret; 599ac6feceeSTrond Myklebust 600ac6feceeSTrond Myklebust dget(dentry); 601ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 602a35d632cSAmir Goldstein if (!ret) 603a35d632cSAmir Goldstein fsnotify_rmdir(dir, dentry); 604ac6feceeSTrond Myklebust d_delete(dentry); 605ac6feceeSTrond Myklebust dput(dentry); 606ac6feceeSTrond Myklebust return ret; 607ac6feceeSTrond Myklebust } 608ac6feceeSTrond Myklebust 609810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 610810d90bcSTrond Myklebust { 611810d90bcSTrond Myklebust int ret; 612810d90bcSTrond Myklebust 613810d90bcSTrond Myklebust dget(dentry); 614810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 615a35d632cSAmir Goldstein if (!ret) 616a35d632cSAmir Goldstein fsnotify_unlink(dir, dentry); 617810d90bcSTrond Myklebust d_delete(dentry); 618810d90bcSTrond Myklebust dput(dentry); 619810d90bcSTrond Myklebust return ret; 620810d90bcSTrond Myklebust } 621810d90bcSTrond Myklebust 622810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 623810d90bcSTrond Myklebust { 624c5ef6035SDavid Howells struct inode *inode = d_inode(dentry); 625810d90bcSTrond Myklebust 626810d90bcSTrond Myklebust rpc_close_pipes(inode); 627810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 628810d90bcSTrond Myklebust } 629810d90bcSTrond Myklebust 630cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 631d3db90b0SAl Viro const char *name) 632cfeaa4a3STrond Myklebust { 633d3db90b0SAl Viro struct qstr q = QSTR_INIT(name, strlen(name)); 634d3db90b0SAl Viro struct dentry *dentry = d_hash_and_lookup(parent, &q); 6355bff0386SStanislav Kinsbursky if (!dentry) { 636d3db90b0SAl Viro dentry = d_alloc(parent, &q); 6375bff0386SStanislav Kinsbursky if (!dentry) 6385bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6395bff0386SStanislav Kinsbursky } 640c5ef6035SDavid Howells if (d_really_is_negative(dentry)) 641f1f0abe1SDan Carpenter return dentry; 642cfeaa4a3STrond Myklebust dput(dentry); 643cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 644cfeaa4a3STrond Myklebust } 645cfeaa4a3STrond Myklebust 6461da177e4SLinus Torvalds /* 6471da177e4SLinus Torvalds * FIXME: This probably has races. 6481da177e4SLinus Torvalds */ 649ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 650ac6feceeSTrond Myklebust const struct rpc_filelist *files, 651ac6feceeSTrond Myklebust int start, int eof) 6521da177e4SLinus Torvalds { 653c5ef6035SDavid Howells struct inode *dir = d_inode(parent); 654ac6feceeSTrond Myklebust struct dentry *dentry; 655ac6feceeSTrond Myklebust struct qstr name; 656ac6feceeSTrond Myklebust int i; 657ac6feceeSTrond Myklebust 658ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 659ac6feceeSTrond Myklebust name.name = files[i].name; 660ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 661d3db90b0SAl Viro dentry = d_hash_and_lookup(parent, &name); 662ac6feceeSTrond Myklebust 663ac6feceeSTrond Myklebust if (dentry == NULL) 664ac6feceeSTrond Myklebust continue; 665c5ef6035SDavid Howells if (d_really_is_negative(dentry)) 666ac6feceeSTrond Myklebust goto next; 667c5ef6035SDavid Howells switch (d_inode(dentry)->i_mode & S_IFMT) { 668ac6feceeSTrond Myklebust default: 669ac6feceeSTrond Myklebust BUG(); 670ac6feceeSTrond Myklebust case S_IFREG: 671ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 672ac6feceeSTrond Myklebust break; 673ac6feceeSTrond Myklebust case S_IFDIR: 674ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 675ac6feceeSTrond Myklebust } 676ac6feceeSTrond Myklebust next: 677ac6feceeSTrond Myklebust dput(dentry); 678ac6feceeSTrond Myklebust } 679ac6feceeSTrond Myklebust } 680ac6feceeSTrond Myklebust 681ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 682ac6feceeSTrond Myklebust const struct rpc_filelist *files, 683ac6feceeSTrond Myklebust int start, int eof) 684ac6feceeSTrond Myklebust { 685c5ef6035SDavid Howells struct inode *dir = d_inode(parent); 6861da177e4SLinus Torvalds 6875955102cSAl Viro inode_lock_nested(dir, I_MUTEX_CHILD); 688ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 6895955102cSAl Viro inode_unlock(dir); 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 692ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 693ac6feceeSTrond Myklebust const struct rpc_filelist *files, 694ac6feceeSTrond Myklebust int start, int eof, 695ac6feceeSTrond Myklebust void *private) 6961da177e4SLinus Torvalds { 697c5ef6035SDavid Howells struct inode *dir = d_inode(parent); 6981da177e4SLinus Torvalds struct dentry *dentry; 699ac6feceeSTrond Myklebust int i, err; 7001da177e4SLinus Torvalds 7015955102cSAl Viro inode_lock(dir); 7021da177e4SLinus Torvalds for (i = start; i < eof; i++) { 703d3db90b0SAl Viro dentry = __rpc_lookup_create_exclusive(parent, files[i].name); 704ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 705ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 7061da177e4SLinus Torvalds goto out_bad; 707ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 708ac6feceeSTrond Myklebust default: 709ac6feceeSTrond Myklebust BUG(); 710ac6feceeSTrond Myklebust case S_IFREG: 711ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 712ac6feceeSTrond Myklebust files[i].mode, 713ac6feceeSTrond Myklebust files[i].i_fop, 714ac6feceeSTrond Myklebust private); 715ac6feceeSTrond Myklebust break; 716ac6feceeSTrond Myklebust case S_IFDIR: 717ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 718ac6feceeSTrond Myklebust files[i].mode, 719ac6feceeSTrond Myklebust NULL, 720ac6feceeSTrond Myklebust private); 7211da177e4SLinus Torvalds } 722ac6feceeSTrond Myklebust if (err != 0) 723ac6feceeSTrond Myklebust goto out_bad; 7241da177e4SLinus Torvalds } 7255955102cSAl Viro inode_unlock(dir); 7261da177e4SLinus Torvalds return 0; 7271da177e4SLinus Torvalds out_bad: 728ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7295955102cSAl Viro inode_unlock(dir); 7301e903edaSAl Viro printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", 7311e903edaSAl Viro __FILE__, __func__, parent); 732ac6feceeSTrond Myklebust return err; 733f134585aSTrond Myklebust } 734f134585aSTrond Myklebust 735e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 736a95e691fSAl Viro const char *name, umode_t mode, void *private, 737e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 738f134585aSTrond Myklebust { 739f134585aSTrond Myklebust struct dentry *dentry; 740c5ef6035SDavid Howells struct inode *dir = d_inode(parent); 741f134585aSTrond Myklebust int error; 742f134585aSTrond Myklebust 7435955102cSAl Viro inode_lock_nested(dir, I_MUTEX_PARENT); 7447d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 745f134585aSTrond Myklebust if (IS_ERR(dentry)) 7467d59d1e8STrond Myklebust goto out; 7477d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7487589806eSTrond Myklebust if (error != 0) 7497589806eSTrond Myklebust goto out_err; 750e57aed77STrond Myklebust if (populate != NULL) { 751e57aed77STrond Myklebust error = populate(dentry, args_populate); 752f134585aSTrond Myklebust if (error) 753ac6feceeSTrond Myklebust goto err_rmdir; 754e57aed77STrond Myklebust } 755f134585aSTrond Myklebust out: 7565955102cSAl Viro inode_unlock(dir); 7575c3e985aSTrond Myklebust return dentry; 758ac6feceeSTrond Myklebust err_rmdir: 759f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7607589806eSTrond Myklebust out_err: 761f134585aSTrond Myklebust dentry = ERR_PTR(error); 762f134585aSTrond Myklebust goto out; 763f134585aSTrond Myklebust } 764f134585aSTrond Myklebust 765e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 766e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 767f134585aSTrond Myklebust { 768dff02cc1STrond Myklebust struct dentry *parent; 769f134585aSTrond Myklebust struct inode *dir; 770f134585aSTrond Myklebust int error; 771f134585aSTrond Myklebust 772dff02cc1STrond Myklebust parent = dget_parent(dentry); 773c5ef6035SDavid Howells dir = d_inode(parent); 7745955102cSAl Viro inode_lock_nested(dir, I_MUTEX_PARENT); 775e57aed77STrond Myklebust if (depopulate != NULL) 776e57aed77STrond Myklebust depopulate(dentry); 777f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 7785955102cSAl Viro inode_unlock(dir); 779dff02cc1STrond Myklebust dput(parent); 780f134585aSTrond Myklebust return error; 781f134585aSTrond Myklebust } 7821da177e4SLinus Torvalds 78393a44a75SJ. Bruce Fields /** 78493a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 78593a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 78693a44a75SJ. Bruce Fields * @name: name of pipe 78793a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 788bda14606SRandy Dunlap * @pipe: &rpc_pipe containing input parameters 78993a44a75SJ. Bruce Fields * 79093a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 79193a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 79293a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 79393a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 79493a44a75SJ. Bruce Fields * 79593a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 79693a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 79793a44a75SJ. Bruce Fields * 79893a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 799496ad9aaSAl Viro * from the file pointer, via RPC_I(file_inode(file))->private. 80093a44a75SJ. Bruce Fields */ 801c239d83bSStanislav Kinsbursky struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, 802c239d83bSStanislav Kinsbursky void *private, struct rpc_pipe *pipe) 8031da177e4SLinus Torvalds { 8041da177e4SLinus Torvalds struct dentry *dentry; 805c5ef6035SDavid Howells struct inode *dir = d_inode(parent); 806d6444062SJoe Perches umode_t umode = S_IFIFO | 0600; 8077589806eSTrond Myklebust int err; 8087364af6aSTrond Myklebust 809c239d83bSStanislav Kinsbursky if (pipe->ops->upcall == NULL) 810d6444062SJoe Perches umode &= ~0444; 811c239d83bSStanislav Kinsbursky if (pipe->ops->downcall == NULL) 812d6444062SJoe Perches umode &= ~0222; 8131da177e4SLinus Torvalds 8145955102cSAl Viro inode_lock_nested(dir, I_MUTEX_PARENT); 815d3db90b0SAl Viro dentry = __rpc_lookup_create_exclusive(parent, name); 8161da177e4SLinus Torvalds if (IS_ERR(dentry)) 817cfeaa4a3STrond Myklebust goto out; 818c239d83bSStanislav Kinsbursky err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, 819c239d83bSStanislav Kinsbursky private, pipe); 8207589806eSTrond Myklebust if (err) 8217589806eSTrond Myklebust goto out_err; 822f134585aSTrond Myklebust out: 8235955102cSAl Viro inode_unlock(dir); 8245c3e985aSTrond Myklebust return dentry; 8257589806eSTrond Myklebust out_err: 8267589806eSTrond Myklebust dentry = ERR_PTR(err); 8271e903edaSAl Viro printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", 8281e903edaSAl Viro __FILE__, __func__, parent, name, 8297589806eSTrond Myklebust err); 830f134585aSTrond Myklebust goto out; 8311da177e4SLinus Torvalds } 832c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); 8331da177e4SLinus Torvalds 83493a44a75SJ. Bruce Fields /** 83593a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 83693a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 83793a44a75SJ. Bruce Fields * 83893a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 83993a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 84093a44a75SJ. Bruce Fields * return -EPIPE. 84193a44a75SJ. Bruce Fields */ 842f134585aSTrond Myklebust int 8435d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8441da177e4SLinus Torvalds { 8455d67476fSTrond Myklebust struct dentry *parent; 846f134585aSTrond Myklebust struct inode *dir; 8475d67476fSTrond Myklebust int error = 0; 8481da177e4SLinus Torvalds 8495d67476fSTrond Myklebust parent = dget_parent(dentry); 850c5ef6035SDavid Howells dir = d_inode(parent); 8515955102cSAl Viro inode_lock_nested(dir, I_MUTEX_PARENT); 852810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8535955102cSAl Viro inode_unlock(dir); 8545d67476fSTrond Myklebust dput(parent); 855f134585aSTrond Myklebust return error; 8561da177e4SLinus Torvalds } 857468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8581da177e4SLinus Torvalds 8596739ffb7STrond Myklebust /** 8606739ffb7STrond Myklebust * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head 8616739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 8626739ffb7STrond Myklebust */ 8636739ffb7STrond Myklebust void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) 8646739ffb7STrond Myklebust { 8656739ffb7STrond Myklebust INIT_LIST_HEAD(&pdh->pdh_entries); 8666739ffb7STrond Myklebust pdh->pdh_dentry = NULL; 8676739ffb7STrond Myklebust } 8686739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); 8696739ffb7STrond Myklebust 8706739ffb7STrond Myklebust /** 8716739ffb7STrond Myklebust * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object 8726739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 8736739ffb7STrond Myklebust * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops 8746739ffb7STrond Myklebust * @pdo_data: pointer to caller-defined data 8756739ffb7STrond Myklebust */ 8766739ffb7STrond Myklebust void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, 8776739ffb7STrond Myklebust const struct rpc_pipe_dir_object_ops *pdo_ops, 8786739ffb7STrond Myklebust void *pdo_data) 8796739ffb7STrond Myklebust { 8806739ffb7STrond Myklebust INIT_LIST_HEAD(&pdo->pdo_head); 8816739ffb7STrond Myklebust pdo->pdo_ops = pdo_ops; 8826739ffb7STrond Myklebust pdo->pdo_data = pdo_data; 8836739ffb7STrond Myklebust } 8846739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); 8856739ffb7STrond Myklebust 8866739ffb7STrond Myklebust static int 8876739ffb7STrond Myklebust rpc_add_pipe_dir_object_locked(struct net *net, 8886739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 8896739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 8906739ffb7STrond Myklebust { 8916739ffb7STrond Myklebust int ret = 0; 8926739ffb7STrond Myklebust 8936739ffb7STrond Myklebust if (pdh->pdh_dentry) 8946739ffb7STrond Myklebust ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); 8956739ffb7STrond Myklebust if (ret == 0) 8966739ffb7STrond Myklebust list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); 8976739ffb7STrond Myklebust return ret; 8986739ffb7STrond Myklebust } 8996739ffb7STrond Myklebust 9006739ffb7STrond Myklebust static void 9016739ffb7STrond Myklebust rpc_remove_pipe_dir_object_locked(struct net *net, 9026739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9036739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9046739ffb7STrond Myklebust { 9056739ffb7STrond Myklebust if (pdh->pdh_dentry) 9066739ffb7STrond Myklebust pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); 9076739ffb7STrond Myklebust list_del_init(&pdo->pdo_head); 9086739ffb7STrond Myklebust } 9096739ffb7STrond Myklebust 9106739ffb7STrond Myklebust /** 9116739ffb7STrond Myklebust * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory 9126739ffb7STrond Myklebust * @net: pointer to struct net 9136739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 9146739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 9156739ffb7STrond Myklebust * 9166739ffb7STrond Myklebust */ 9176739ffb7STrond Myklebust int 9186739ffb7STrond Myklebust rpc_add_pipe_dir_object(struct net *net, 9196739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9206739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9216739ffb7STrond Myklebust { 9226739ffb7STrond Myklebust int ret = 0; 9236739ffb7STrond Myklebust 9246739ffb7STrond Myklebust if (list_empty(&pdo->pdo_head)) { 9256739ffb7STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 9266739ffb7STrond Myklebust 9276739ffb7STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 9286739ffb7STrond Myklebust ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); 9296739ffb7STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 9306739ffb7STrond Myklebust } 9316739ffb7STrond Myklebust return ret; 9326739ffb7STrond Myklebust } 9336739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); 9346739ffb7STrond Myklebust 9356739ffb7STrond Myklebust /** 9366739ffb7STrond Myklebust * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory 9376739ffb7STrond Myklebust * @net: pointer to struct net 9386739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 9396739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 9406739ffb7STrond Myklebust * 9416739ffb7STrond Myklebust */ 9426739ffb7STrond Myklebust void 9436739ffb7STrond Myklebust rpc_remove_pipe_dir_object(struct net *net, 9446739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9456739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9466739ffb7STrond Myklebust { 9476739ffb7STrond Myklebust if (!list_empty(&pdo->pdo_head)) { 9486739ffb7STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 9496739ffb7STrond Myklebust 9506739ffb7STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 9516739ffb7STrond Myklebust rpc_remove_pipe_dir_object_locked(net, pdh, pdo); 9526739ffb7STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 9536739ffb7STrond Myklebust } 9546739ffb7STrond Myklebust } 9556739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); 9566739ffb7STrond Myklebust 957298fc355STrond Myklebust /** 958298fc355STrond Myklebust * rpc_find_or_alloc_pipe_dir_object 959298fc355STrond Myklebust * @net: pointer to struct net 960298fc355STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 961298fc355STrond Myklebust * @match: match struct rpc_pipe_dir_object to data 962298fc355STrond Myklebust * @alloc: allocate a new struct rpc_pipe_dir_object 963298fc355STrond Myklebust * @data: user defined data for match() and alloc() 964298fc355STrond Myklebust * 965298fc355STrond Myklebust */ 966298fc355STrond Myklebust struct rpc_pipe_dir_object * 967298fc355STrond Myklebust rpc_find_or_alloc_pipe_dir_object(struct net *net, 968298fc355STrond Myklebust struct rpc_pipe_dir_head *pdh, 969298fc355STrond Myklebust int (*match)(struct rpc_pipe_dir_object *, void *), 970298fc355STrond Myklebust struct rpc_pipe_dir_object *(*alloc)(void *), 971298fc355STrond Myklebust void *data) 972298fc355STrond Myklebust { 973298fc355STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 974298fc355STrond Myklebust struct rpc_pipe_dir_object *pdo; 975298fc355STrond Myklebust 976298fc355STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 977298fc355STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { 978298fc355STrond Myklebust if (!match(pdo, data)) 979298fc355STrond Myklebust continue; 980298fc355STrond Myklebust goto out; 981298fc355STrond Myklebust } 982298fc355STrond Myklebust pdo = alloc(data); 983298fc355STrond Myklebust if (!pdo) 984298fc355STrond Myklebust goto out; 985298fc355STrond Myklebust rpc_add_pipe_dir_object_locked(net, pdh, pdo); 986298fc355STrond Myklebust out: 987298fc355STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 988298fc355STrond Myklebust return pdo; 989298fc355STrond Myklebust } 990298fc355STrond Myklebust EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); 991298fc355STrond Myklebust 9926739ffb7STrond Myklebust static void 9936739ffb7STrond Myklebust rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) 9946739ffb7STrond Myklebust { 9956739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo; 9966739ffb7STrond Myklebust struct dentry *dir = pdh->pdh_dentry; 9976739ffb7STrond Myklebust 9986739ffb7STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) 9996739ffb7STrond Myklebust pdo->pdo_ops->create(dir, pdo); 10006739ffb7STrond Myklebust } 10016739ffb7STrond Myklebust 10026739ffb7STrond Myklebust static void 10036739ffb7STrond Myklebust rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) 10046739ffb7STrond Myklebust { 10056739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo; 10066739ffb7STrond Myklebust struct dentry *dir = pdh->pdh_dentry; 10076739ffb7STrond Myklebust 10086739ffb7STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) 10096739ffb7STrond Myklebust pdo->pdo_ops->destroy(dir, pdo); 10106739ffb7STrond Myklebust } 10116739ffb7STrond Myklebust 1012e57aed77STrond Myklebust enum { 1013e57aed77STrond Myklebust RPCAUTH_info, 1014e57aed77STrond Myklebust RPCAUTH_EOF 1015e57aed77STrond Myklebust }; 1016e57aed77STrond Myklebust 1017e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 1018e57aed77STrond Myklebust [RPCAUTH_info] = { 1019e57aed77STrond Myklebust .name = "info", 1020e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 1021d6444062SJoe Perches .mode = S_IFREG | 0400, 1022e57aed77STrond Myklebust }, 1023e57aed77STrond Myklebust }; 1024e57aed77STrond Myklebust 1025e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 1026e57aed77STrond Myklebust { 1027e57aed77STrond Myklebust return rpc_populate(dentry, 1028e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 1029e57aed77STrond Myklebust private); 1030e57aed77STrond Myklebust } 1031e57aed77STrond Myklebust 1032e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 1033e57aed77STrond Myklebust { 1034e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 1035e57aed77STrond Myklebust } 1036e57aed77STrond Myklebust 10377d59d1e8STrond Myklebust /** 10387d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 1039a95e691fSAl Viro * @dentry: the parent of new directory 1040a95e691fSAl Viro * @name: the name of new directory 10417d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 10427d59d1e8STrond Myklebust * 10437d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 10447d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 10457d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 10467d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 10477d59d1e8STrond Myklebust */ 104823ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 1049a95e691fSAl Viro const char *name, 10507d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 10517d59d1e8STrond Myklebust { 10526739ffb7STrond Myklebust struct dentry *ret; 10536739ffb7STrond Myklebust 1054d6444062SJoe Perches ret = rpc_mkdir_populate(dentry, name, 0555, NULL, 1055e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 10566739ffb7STrond Myklebust if (!IS_ERR(ret)) { 10576739ffb7STrond Myklebust rpc_client->cl_pipedir_objects.pdh_dentry = ret; 10586739ffb7STrond Myklebust rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); 10596739ffb7STrond Myklebust } 10606739ffb7STrond Myklebust return ret; 1061e57aed77STrond Myklebust } 1062e57aed77STrond Myklebust 1063e57aed77STrond Myklebust /** 1064e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 10656739ffb7STrond Myklebust * @rpc_client: rpc_client for the pipe 1066e57aed77STrond Myklebust */ 1067c36dcfe1STrond Myklebust int rpc_remove_client_dir(struct rpc_clnt *rpc_client) 1068e57aed77STrond Myklebust { 1069c36dcfe1STrond Myklebust struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; 1070c36dcfe1STrond Myklebust 1071c36dcfe1STrond Myklebust if (dentry == NULL) 1072c36dcfe1STrond Myklebust return 0; 10736739ffb7STrond Myklebust rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); 10746739ffb7STrond Myklebust rpc_client->cl_pipedir_objects.pdh_dentry = NULL; 1075e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 10767d59d1e8STrond Myklebust } 10777d59d1e8STrond Myklebust 10788854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 10798854e82dSTrond Myklebust [0] = { 10808854e82dSTrond Myklebust .name = "channel", 10818854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 1082d6444062SJoe Perches .mode = S_IFREG | 0600, 10838854e82dSTrond Myklebust }, 10848854e82dSTrond Myklebust [1] = { 10858854e82dSTrond Myklebust .name = "content", 10868854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 1087d6444062SJoe Perches .mode = S_IFREG | 0400, 10888854e82dSTrond Myklebust }, 10898854e82dSTrond Myklebust [2] = { 10908854e82dSTrond Myklebust .name = "flush", 10918854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 1092d6444062SJoe Perches .mode = S_IFREG | 0600, 10938854e82dSTrond Myklebust }, 10948854e82dSTrond Myklebust }; 10958854e82dSTrond Myklebust 10968854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 10978854e82dSTrond Myklebust { 10988854e82dSTrond Myklebust return rpc_populate(dentry, 10998854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 11008854e82dSTrond Myklebust private); 11018854e82dSTrond Myklebust } 11028854e82dSTrond Myklebust 11038854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 11048854e82dSTrond Myklebust { 11058854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 11068854e82dSTrond Myklebust } 11078854e82dSTrond Myklebust 1108a95e691fSAl Viro struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, 110964f1426fSAl Viro umode_t umode, struct cache_detail *cd) 11108854e82dSTrond Myklebust { 11118854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 11128854e82dSTrond Myklebust rpc_cachedir_populate, cd); 11138854e82dSTrond Myklebust } 11148854e82dSTrond Myklebust 11158854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 11168854e82dSTrond Myklebust { 11178854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 11188854e82dSTrond Myklebust } 11198854e82dSTrond Myklebust 11201da177e4SLinus Torvalds /* 11211da177e4SLinus Torvalds * populate the filesystem 11221da177e4SLinus Torvalds */ 1123b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 11241da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 1125bef252faSAl Viro .free_inode = rpc_free_inode, 11261da177e4SLinus Torvalds .statfs = simple_statfs, 11271da177e4SLinus Torvalds }; 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 11301da177e4SLinus Torvalds 1131bb156749STrond Myklebust /* 1132bb156749STrond Myklebust * We have a single directory with 1 node in it. 1133bb156749STrond Myklebust */ 1134bb156749STrond Myklebust enum { 1135bb156749STrond Myklebust RPCAUTH_lockd, 1136bb156749STrond Myklebust RPCAUTH_mount, 1137bb156749STrond Myklebust RPCAUTH_nfs, 1138bb156749STrond Myklebust RPCAUTH_portmap, 1139bb156749STrond Myklebust RPCAUTH_statd, 1140bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 1141e571cbf1STrond Myklebust RPCAUTH_cache, 1142b3537c35SJeff Layton RPCAUTH_nfsd, 11434b9a445eSJeff Layton RPCAUTH_gssd, 1144bb156749STrond Myklebust RPCAUTH_RootEOF 1145bb156749STrond Myklebust }; 1146bb156749STrond Myklebust 1147bb156749STrond Myklebust static const struct rpc_filelist files[] = { 1148bb156749STrond Myklebust [RPCAUTH_lockd] = { 1149bb156749STrond Myklebust .name = "lockd", 1150d6444062SJoe Perches .mode = S_IFDIR | 0555, 1151bb156749STrond Myklebust }, 1152bb156749STrond Myklebust [RPCAUTH_mount] = { 1153bb156749STrond Myklebust .name = "mount", 1154d6444062SJoe Perches .mode = S_IFDIR | 0555, 1155bb156749STrond Myklebust }, 1156bb156749STrond Myklebust [RPCAUTH_nfs] = { 1157bb156749STrond Myklebust .name = "nfs", 1158d6444062SJoe Perches .mode = S_IFDIR | 0555, 1159bb156749STrond Myklebust }, 1160bb156749STrond Myklebust [RPCAUTH_portmap] = { 1161bb156749STrond Myklebust .name = "portmap", 1162d6444062SJoe Perches .mode = S_IFDIR | 0555, 1163bb156749STrond Myklebust }, 1164bb156749STrond Myklebust [RPCAUTH_statd] = { 1165bb156749STrond Myklebust .name = "statd", 1166d6444062SJoe Perches .mode = S_IFDIR | 0555, 1167bb156749STrond Myklebust }, 1168bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 1169bb156749STrond Myklebust .name = "nfsd4_cb", 1170d6444062SJoe Perches .mode = S_IFDIR | 0555, 1171bb156749STrond Myklebust }, 1172e571cbf1STrond Myklebust [RPCAUTH_cache] = { 1173e571cbf1STrond Myklebust .name = "cache", 1174d6444062SJoe Perches .mode = S_IFDIR | 0555, 1175e571cbf1STrond Myklebust }, 1176b3537c35SJeff Layton [RPCAUTH_nfsd] = { 1177b3537c35SJeff Layton .name = "nfsd", 1178d6444062SJoe Perches .mode = S_IFDIR | 0555, 1179b3537c35SJeff Layton }, 11804b9a445eSJeff Layton [RPCAUTH_gssd] = { 11814b9a445eSJeff Layton .name = "gssd", 1182d6444062SJoe Perches .mode = S_IFDIR | 0555, 11834b9a445eSJeff Layton }, 1184bb156749STrond Myklebust }; 1185bb156749STrond Myklebust 1186432eb1a5SStanislav Kinsbursky /* 1187432eb1a5SStanislav Kinsbursky * This call can be used only in RPC pipefs mount notification hooks. 1188432eb1a5SStanislav Kinsbursky */ 1189432eb1a5SStanislav Kinsbursky struct dentry *rpc_d_lookup_sb(const struct super_block *sb, 1190432eb1a5SStanislav Kinsbursky const unsigned char *dir_name) 1191432eb1a5SStanislav Kinsbursky { 119226fe5750SLinus Torvalds struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); 1193d3db90b0SAl Viro return d_hash_and_lookup(sb->s_root, &dir); 1194432eb1a5SStanislav Kinsbursky } 1195432eb1a5SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 1196432eb1a5SStanislav Kinsbursky 11974b9a445eSJeff Layton int rpc_pipefs_init_net(struct net *net) 1198c21a588fSStanislav Kinsbursky { 1199c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1200c21a588fSStanislav Kinsbursky 12014b9a445eSJeff Layton sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); 12024b9a445eSJeff Layton if (IS_ERR(sn->gssd_dummy)) 12034b9a445eSJeff Layton return PTR_ERR(sn->gssd_dummy); 12044b9a445eSJeff Layton 1205c21a588fSStanislav Kinsbursky mutex_init(&sn->pipefs_sb_lock); 12062aed8b47STrond Myklebust sn->pipe_version = -1; 12074b9a445eSJeff Layton return 0; 12084b9a445eSJeff Layton } 12094b9a445eSJeff Layton 12104b9a445eSJeff Layton void rpc_pipefs_exit_net(struct net *net) 12114b9a445eSJeff Layton { 12124b9a445eSJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 12134b9a445eSJeff Layton 12144b9a445eSJeff Layton rpc_destroy_pipe_data(sn->gssd_dummy); 1215c21a588fSStanislav Kinsbursky } 1216c21a588fSStanislav Kinsbursky 1217c21a588fSStanislav Kinsbursky /* 1218c21a588fSStanislav Kinsbursky * This call will be used for per network namespace operations calls. 1219c21a588fSStanislav Kinsbursky * Note: Function will be returned with pipefs_sb_lock taken if superblock was 1220c21a588fSStanislav Kinsbursky * found. This lock have to be released by rpc_put_sb_net() when all operations 1221c21a588fSStanislav Kinsbursky * will be completed. 1222c21a588fSStanislav Kinsbursky */ 1223c21a588fSStanislav Kinsbursky struct super_block *rpc_get_sb_net(const struct net *net) 1224c21a588fSStanislav Kinsbursky { 1225c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1226c21a588fSStanislav Kinsbursky 1227c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1228c21a588fSStanislav Kinsbursky if (sn->pipefs_sb) 1229c21a588fSStanislav Kinsbursky return sn->pipefs_sb; 1230c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1231c21a588fSStanislav Kinsbursky return NULL; 1232c21a588fSStanislav Kinsbursky } 1233c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_get_sb_net); 1234c21a588fSStanislav Kinsbursky 1235c21a588fSStanislav Kinsbursky void rpc_put_sb_net(const struct net *net) 1236c21a588fSStanislav Kinsbursky { 1237c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1238c21a588fSStanislav Kinsbursky 1239749386e9SWeston Andros Adamson WARN_ON(sn->pipefs_sb == NULL); 1240c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1241c21a588fSStanislav Kinsbursky } 1242c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_put_sb_net); 1243c21a588fSStanislav Kinsbursky 12444b9a445eSJeff Layton static const struct rpc_filelist gssd_dummy_clnt_dir[] = { 12454b9a445eSJeff Layton [0] = { 12464b9a445eSJeff Layton .name = "clntXX", 1247d6444062SJoe Perches .mode = S_IFDIR | 0555, 12484b9a445eSJeff Layton }, 12494b9a445eSJeff Layton }; 12504b9a445eSJeff Layton 12514b9a445eSJeff Layton static ssize_t 12524b9a445eSJeff Layton dummy_downcall(struct file *filp, const char __user *src, size_t len) 12534b9a445eSJeff Layton { 12544b9a445eSJeff Layton return -EINVAL; 12554b9a445eSJeff Layton } 12564b9a445eSJeff Layton 12574b9a445eSJeff Layton static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { 12584b9a445eSJeff Layton .upcall = rpc_pipe_generic_upcall, 12594b9a445eSJeff Layton .downcall = dummy_downcall, 12604b9a445eSJeff Layton }; 12614b9a445eSJeff Layton 1262e2f0c83aSJeff Layton /* 1263e2f0c83aSJeff Layton * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect 1264e2f0c83aSJeff Layton * that it will ever use this info to handle an upcall, but rpc.gssd expects 1265e2f0c83aSJeff Layton * that this file will be there and have a certain format. 1266e2f0c83aSJeff Layton */ 1267e2f0c83aSJeff Layton static int 1268260f71efSYangtao Li rpc_dummy_info_show(struct seq_file *m, void *v) 1269e2f0c83aSJeff Layton { 1270e2f0c83aSJeff Layton seq_printf(m, "RPC server: %s\n", utsname()->nodename); 1271e2f0c83aSJeff Layton seq_printf(m, "service: foo (1) version 0\n"); 1272e2f0c83aSJeff Layton seq_printf(m, "address: 127.0.0.1\n"); 1273e2f0c83aSJeff Layton seq_printf(m, "protocol: tcp\n"); 1274e2f0c83aSJeff Layton seq_printf(m, "port: 0\n"); 1275e2f0c83aSJeff Layton return 0; 1276e2f0c83aSJeff Layton } 1277260f71efSYangtao Li DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info); 1278e2f0c83aSJeff Layton 1279e2f0c83aSJeff Layton static const struct rpc_filelist gssd_dummy_info_file[] = { 1280e2f0c83aSJeff Layton [0] = { 1281e2f0c83aSJeff Layton .name = "info", 1282260f71efSYangtao Li .i_fop = &rpc_dummy_info_fops, 1283d6444062SJoe Perches .mode = S_IFREG | 0400, 1284e2f0c83aSJeff Layton }, 1285e2f0c83aSJeff Layton }; 1286e2f0c83aSJeff Layton 12874b9a445eSJeff Layton /** 12884b9a445eSJeff Layton * rpc_gssd_dummy_populate - create a dummy gssd pipe 12894b9a445eSJeff Layton * @root: root of the rpc_pipefs filesystem 12904b9a445eSJeff Layton * @pipe_data: pipe data created when netns is initialized 12914b9a445eSJeff Layton * 12924b9a445eSJeff Layton * Create a dummy set of directories and a pipe that gssd can hold open to 12934b9a445eSJeff Layton * indicate that it is up and running. 12944b9a445eSJeff Layton */ 12954b9a445eSJeff Layton static struct dentry * 12964b9a445eSJeff Layton rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) 12974b9a445eSJeff Layton { 12984b9a445eSJeff Layton int ret = 0; 12994b9a445eSJeff Layton struct dentry *gssd_dentry; 13004b9a445eSJeff Layton struct dentry *clnt_dentry = NULL; 13014b9a445eSJeff Layton struct dentry *pipe_dentry = NULL; 13024b9a445eSJeff Layton struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, 13034b9a445eSJeff Layton strlen(files[RPCAUTH_gssd].name)); 13044b9a445eSJeff Layton 13054b9a445eSJeff Layton /* We should never get this far if "gssd" doesn't exist */ 13064b9a445eSJeff Layton gssd_dentry = d_hash_and_lookup(root, &q); 13074b9a445eSJeff Layton if (!gssd_dentry) 13084b9a445eSJeff Layton return ERR_PTR(-ENOENT); 13094b9a445eSJeff Layton 13104b9a445eSJeff Layton ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); 13114b9a445eSJeff Layton if (ret) { 13124b9a445eSJeff Layton pipe_dentry = ERR_PTR(ret); 13134b9a445eSJeff Layton goto out; 13144b9a445eSJeff Layton } 13154b9a445eSJeff Layton 13164b9a445eSJeff Layton q.name = gssd_dummy_clnt_dir[0].name; 13174b9a445eSJeff Layton q.len = strlen(gssd_dummy_clnt_dir[0].name); 13184b9a445eSJeff Layton clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); 13194b9a445eSJeff Layton if (!clnt_dentry) { 13204b9a445eSJeff Layton pipe_dentry = ERR_PTR(-ENOENT); 13214b9a445eSJeff Layton goto out; 13224b9a445eSJeff Layton } 13234b9a445eSJeff Layton 1324e2f0c83aSJeff Layton ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL); 1325e2f0c83aSJeff Layton if (ret) { 13263396f92fSJeff Layton __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); 1327e2f0c83aSJeff Layton pipe_dentry = ERR_PTR(ret); 1328e2f0c83aSJeff Layton goto out; 1329e2f0c83aSJeff Layton } 1330e2f0c83aSJeff Layton 1331e2f0c83aSJeff Layton pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); 1332e2f0c83aSJeff Layton if (IS_ERR(pipe_dentry)) { 1333e2f0c83aSJeff Layton __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1); 1334e2f0c83aSJeff Layton __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); 1335e2f0c83aSJeff Layton } 13364b9a445eSJeff Layton out: 13374b9a445eSJeff Layton dput(clnt_dentry); 13384b9a445eSJeff Layton dput(gssd_dentry); 13394b9a445eSJeff Layton return pipe_dentry; 13404b9a445eSJeff Layton } 13414b9a445eSJeff Layton 134223e66ba9SJeff Layton static void 134323e66ba9SJeff Layton rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry) 134423e66ba9SJeff Layton { 134523e66ba9SJeff Layton struct dentry *clnt_dir = pipe_dentry->d_parent; 134623e66ba9SJeff Layton struct dentry *gssd_dir = clnt_dir->d_parent; 134723e66ba9SJeff Layton 13484a3877c4SAl Viro dget(pipe_dentry); 1349c5ef6035SDavid Howells __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry); 135023e66ba9SJeff Layton __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1); 135123e66ba9SJeff Layton __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1); 135223e66ba9SJeff Layton dput(pipe_dentry); 135323e66ba9SJeff Layton } 135423e66ba9SJeff Layton 13551da177e4SLinus Torvalds static int 1356b9662f31SDavid Howells rpc_fill_super(struct super_block *sb, struct fs_context *fc) 13571da177e4SLinus Torvalds { 13581da177e4SLinus Torvalds struct inode *inode; 13594b9a445eSJeff Layton struct dentry *root, *gssd_dentry; 1360b9662f31SDavid Howells struct net *net = sb->s_fs_info; 136190c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 13622d00131aSStanislav Kinsbursky int err; 13631da177e4SLinus Torvalds 136409cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 136509cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 13661da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 13671da177e4SLinus Torvalds sb->s_op = &s_ops; 1368b26d4cd3SAl Viro sb->s_d_op = &simple_dentry_operations; 13691da177e4SLinus Torvalds sb->s_time_gran = 1; 13701da177e4SLinus Torvalds 1371d6444062SJoe Perches inode = rpc_get_inode(sb, S_IFDIR | 0555); 137248fde701SAl Viro sb->s_root = root = d_make_root(inode); 137348fde701SAl Viro if (!root) 13741da177e4SLinus Torvalds return -ENOMEM; 1375ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 13761da177e4SLinus Torvalds return -ENOMEM; 13774b9a445eSJeff Layton 13784b9a445eSJeff Layton gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); 13794b9a445eSJeff Layton if (IS_ERR(gssd_dentry)) { 13804b9a445eSJeff Layton __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 13814b9a445eSJeff Layton return PTR_ERR(gssd_dentry); 13824b9a445eSJeff Layton } 13834b9a445eSJeff Layton 13846c67a3e4SVasily Averin dprintk("RPC: sending pipefs MOUNT notification for net %x%s\n", 13856c67a3e4SVasily Averin net->ns.inum, NET_NAME(net)); 138638481605SStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 138737629b57SStanislav Kinsbursky sn->pipefs_sb = sb; 13882d00131aSStanislav Kinsbursky err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 13892d00131aSStanislav Kinsbursky RPC_PIPEFS_MOUNT, 13902d00131aSStanislav Kinsbursky sb); 13912d00131aSStanislav Kinsbursky if (err) 13922d00131aSStanislav Kinsbursky goto err_depopulate; 139338481605SStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1394fc7bed8cSAl Viro return 0; 13952d00131aSStanislav Kinsbursky 13962d00131aSStanislav Kinsbursky err_depopulate: 139723e66ba9SJeff Layton rpc_gssd_dummy_depopulate(gssd_dentry); 13982d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 13992d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 14002d00131aSStanislav Kinsbursky sb); 140137629b57SStanislav Kinsbursky sn->pipefs_sb = NULL; 14022d00131aSStanislav Kinsbursky __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 140338481605SStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 14042d00131aSStanislav Kinsbursky return err; 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 140789f84243SJeff Layton bool 140889f84243SJeff Layton gssd_running(struct net *net) 140989f84243SJeff Layton { 141089f84243SJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 141189f84243SJeff Layton struct rpc_pipe *pipe = sn->gssd_dummy; 141289f84243SJeff Layton 141389f84243SJeff Layton return pipe->nreaders || pipe->nwriters; 141489f84243SJeff Layton } 141589f84243SJeff Layton EXPORT_SYMBOL_GPL(gssd_running); 141689f84243SJeff Layton 1417b9662f31SDavid Howells static int rpc_fs_get_tree(struct fs_context *fc) 14181da177e4SLinus Torvalds { 1419533770ccSAl Viro return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns)); 1420b9662f31SDavid Howells } 1421b9662f31SDavid Howells 1422b9662f31SDavid Howells static void rpc_fs_free_fc(struct fs_context *fc) 1423b9662f31SDavid Howells { 1424b9662f31SDavid Howells if (fc->s_fs_info) 1425b9662f31SDavid Howells put_net(fc->s_fs_info); 1426b9662f31SDavid Howells } 1427b9662f31SDavid Howells 1428b9662f31SDavid Howells static const struct fs_context_operations rpc_fs_context_ops = { 1429b9662f31SDavid Howells .free = rpc_fs_free_fc, 1430b9662f31SDavid Howells .get_tree = rpc_fs_get_tree, 1431b9662f31SDavid Howells }; 1432b9662f31SDavid Howells 1433b9662f31SDavid Howells static int rpc_init_fs_context(struct fs_context *fc) 1434b9662f31SDavid Howells { 1435b9662f31SDavid Howells put_user_ns(fc->user_ns); 1436b9662f31SDavid Howells fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1437b9662f31SDavid Howells fc->ops = &rpc_fs_context_ops; 1438b9662f31SDavid Howells return 0; 14391da177e4SLinus Torvalds } 14401da177e4SLinus Torvalds 144109acfea5STrond Myklebust static void rpc_kill_sb(struct super_block *sb) 1442021c68deSStanislav Kinsbursky { 1443021c68deSStanislav Kinsbursky struct net *net = sb->s_fs_info; 144490c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1445021c68deSStanislav Kinsbursky 1446c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1447642fe4d0STrond Myklebust if (sn->pipefs_sb != sb) { 1448642fe4d0STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 1449642fe4d0STrond Myklebust goto out; 1450642fe4d0STrond Myklebust } 145190c4e829SStanislav Kinsbursky sn->pipefs_sb = NULL; 14526c67a3e4SVasily Averin dprintk("RPC: sending pipefs UMOUNT notification for net %x%s\n", 14536c67a3e4SVasily Averin net->ns.inum, NET_NAME(net)); 14542d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 14552d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 14562d00131aSStanislav Kinsbursky sb); 1457adb6fa7fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1458642fe4d0STrond Myklebust out: 1459021c68deSStanislav Kinsbursky kill_litter_super(sb); 1460d91ee87dSEric W. Biederman put_net(net); 14611da177e4SLinus Torvalds } 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 14641da177e4SLinus Torvalds .owner = THIS_MODULE, 14651da177e4SLinus Torvalds .name = "rpc_pipefs", 1466b9662f31SDavid Howells .init_fs_context = rpc_init_fs_context, 1467021c68deSStanislav Kinsbursky .kill_sb = rpc_kill_sb, 14681da177e4SLinus Torvalds }; 14697f78e035SEric W. Biederman MODULE_ALIAS_FS("rpc_pipefs"); 1470fa7614ddSEric W. Biederman MODULE_ALIAS("rpc_pipefs"); 14711da177e4SLinus Torvalds 14721da177e4SLinus Torvalds static void 147351cc5068SAlexey Dobriyan init_once(void *foo) 14741da177e4SLinus Torvalds { 14751da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 14781da177e4SLinus Torvalds rpci->private = NULL; 1479ba9e0975SStanislav Kinsbursky rpci->pipe = NULL; 14801da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 14811da177e4SLinus Torvalds } 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds int register_rpc_pipefs(void) 14841da177e4SLinus Torvalds { 14855bd5f581SAkinobu Mita int err; 14865bd5f581SAkinobu Mita 14871da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 14881da177e4SLinus Torvalds sizeof(struct rpc_inode), 1489fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 14905d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 149120c2df83SPaul Mundt init_once); 14921da177e4SLinus Torvalds if (!rpc_inode_cachep) 14931da177e4SLinus Torvalds return -ENOMEM; 149480df9d20SStanislav Kinsbursky err = rpc_clients_notifier_register(); 149580df9d20SStanislav Kinsbursky if (err) 149680df9d20SStanislav Kinsbursky goto err_notifier; 14975bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 149880df9d20SStanislav Kinsbursky if (err) 149980df9d20SStanislav Kinsbursky goto err_register; 150080df9d20SStanislav Kinsbursky return 0; 150180df9d20SStanislav Kinsbursky 150280df9d20SStanislav Kinsbursky err_register: 150380df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 150480df9d20SStanislav Kinsbursky err_notifier: 15055bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 15065bd5f581SAkinobu Mita return err; 15075bd5f581SAkinobu Mita } 15085bd5f581SAkinobu Mita 15091da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 15101da177e4SLinus Torvalds { 151180df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 15121a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 15131da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 15141da177e4SLinus Torvalds } 1515