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> 301da177e4SLinus Torvalds 31fc14f2feSAl Viro static struct vfsmount *rpc_mnt __read_mostly; 321da177e4SLinus Torvalds static int rpc_mount_count; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds 37e18b890bSChristoph Lameter static struct kmem_cache *rpc_inode_cachep __read_mostly; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define RPC_UPCALL_TIMEOUT (30*HZ) 401da177e4SLinus Torvalds 419842ef35STrond Myklebust static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, 429842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *), int err) 43b3eb67a2STrond Myklebust { 44b3eb67a2STrond Myklebust struct rpc_pipe_msg *msg; 45b3eb67a2STrond Myklebust 469842ef35STrond Myklebust if (list_empty(head)) 479842ef35STrond Myklebust return; 489842ef35STrond Myklebust do { 49b3eb67a2STrond Myklebust msg = list_entry(head->next, struct rpc_pipe_msg, list); 505a67657aSTrond Myklebust list_del_init(&msg->list); 51b3eb67a2STrond Myklebust msg->errno = err; 52b3eb67a2STrond Myklebust destroy_msg(msg); 539842ef35STrond Myklebust } while (!list_empty(head)); 541da177e4SLinus Torvalds wake_up(&rpci->waitq); 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds static void 5865f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 591da177e4SLinus Torvalds { 609842ef35STrond Myklebust LIST_HEAD(free_list); 6165f27f38SDavid Howells struct rpc_inode *rpci = 6265f27f38SDavid Howells container_of(work, struct rpc_inode, queue_timeout.work); 631da177e4SLinus Torvalds struct inode *inode = &rpci->vfs_inode; 649842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 651da177e4SLinus Torvalds 669842ef35STrond Myklebust spin_lock(&inode->i_lock); 679842ef35STrond Myklebust if (rpci->ops == NULL) { 689842ef35STrond Myklebust spin_unlock(&inode->i_lock); 699842ef35STrond Myklebust return; 709842ef35STrond Myklebust } 719842ef35STrond Myklebust destroy_msg = rpci->ops->destroy_msg; 729842ef35STrond Myklebust if (rpci->nreaders == 0) { 739842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 749842ef35STrond Myklebust rpci->pipelen = 0; 759842ef35STrond Myklebust } 769842ef35STrond Myklebust spin_unlock(&inode->i_lock); 779842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 8093a44a75SJ. Bruce Fields /** 811a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 8293a44a75SJ. Bruce Fields * @inode: inode of upcall pipe on which to queue given message 8393a44a75SJ. Bruce Fields * @msg: message to queue 8493a44a75SJ. Bruce Fields * 8593a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 8693a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 8793a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 8893a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 8993a44a75SJ. Bruce Fields */ 901da177e4SLinus Torvalds int 911da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 946070fe6fSTrond Myklebust int res = -EPIPE; 951da177e4SLinus Torvalds 969842ef35STrond Myklebust spin_lock(&inode->i_lock); 976070fe6fSTrond Myklebust if (rpci->ops == NULL) 986070fe6fSTrond Myklebust goto out; 991da177e4SLinus Torvalds if (rpci->nreaders) { 1001da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 1011da177e4SLinus Torvalds rpci->pipelen += msg->len; 1026070fe6fSTrond Myklebust res = 0; 1031da177e4SLinus Torvalds } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { 1041da177e4SLinus Torvalds if (list_empty(&rpci->pipe)) 10524c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 10624c5d9d7STrond Myklebust &rpci->queue_timeout, 1071da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 1081da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 1091da177e4SLinus Torvalds rpci->pipelen += msg->len; 1106070fe6fSTrond Myklebust res = 0; 1116070fe6fSTrond Myklebust } 1126070fe6fSTrond Myklebust out: 1139842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1141da177e4SLinus Torvalds wake_up(&rpci->waitq); 1151da177e4SLinus Torvalds return res; 1161da177e4SLinus Torvalds } 117468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1181da177e4SLinus Torvalds 1196070fe6fSTrond Myklebust static inline void 1206070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1216070fe6fSTrond Myklebust { 1226070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1236070fe6fSTrond Myklebust } 1246070fe6fSTrond Myklebust 1251da177e4SLinus Torvalds static void 1261da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1271da177e4SLinus Torvalds { 1281da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 129b693ba4aSTrond Myklebust const struct rpc_pipe_ops *ops; 130e712804aS\"J. Bruce Fields\ int need_release; 1311da177e4SLinus Torvalds 1321b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1339842ef35STrond Myklebust ops = rpci->ops; 1349842ef35STrond Myklebust if (ops != NULL) { 1359842ef35STrond Myklebust LIST_HEAD(free_list); 1369842ef35STrond Myklebust spin_lock(&inode->i_lock); 137e712804aS\"J. Bruce Fields\ need_release = rpci->nreaders != 0 || rpci->nwriters != 0; 1381da177e4SLinus Torvalds rpci->nreaders = 0; 1399842ef35STrond Myklebust list_splice_init(&rpci->in_upcall, &free_list); 1409842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 1419842ef35STrond Myklebust rpci->pipelen = 0; 1421da177e4SLinus Torvalds rpci->ops = NULL; 1439842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1449842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); 1459842ef35STrond Myklebust rpci->nwriters = 0; 146e712804aS\"J. Bruce Fields\ if (need_release && ops->release_pipe) 1479842ef35STrond Myklebust ops->release_pipe(inode); 1484011cd97STrond Myklebust cancel_delayed_work_sync(&rpci->queue_timeout); 1491da177e4SLinus Torvalds } 1506070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1511b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static struct inode * 1551da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds struct rpc_inode *rpci; 158e94b1766SChristoph Lameter rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); 1591da177e4SLinus Torvalds if (!rpci) 1601da177e4SLinus Torvalds return NULL; 1611da177e4SLinus Torvalds return &rpci->vfs_inode; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static void 165fa0d7e3dSNick Piggin rpc_i_callback(struct rcu_head *head) 166fa0d7e3dSNick Piggin { 167fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 168fa0d7e3dSNick Piggin INIT_LIST_HEAD(&inode->i_dentry); 169fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 170fa0d7e3dSNick Piggin } 171fa0d7e3dSNick Piggin 172fa0d7e3dSNick Piggin static void 1731da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 1741da177e4SLinus Torvalds { 175fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, rpc_i_callback); 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds static int 1791da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 182c3810608S\"J. Bruce Fields\ int first_open; 1831da177e4SLinus Torvalds int res = -ENXIO; 1841da177e4SLinus Torvalds 1851b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 186c3810608S\"J. Bruce Fields\ if (rpci->ops == NULL) 187c3810608S\"J. Bruce Fields\ goto out; 188c3810608S\"J. Bruce Fields\ first_open = rpci->nreaders == 0 && rpci->nwriters == 0; 189c3810608S\"J. Bruce Fields\ if (first_open && rpci->ops->open_pipe) { 190c3810608S\"J. Bruce Fields\ res = rpci->ops->open_pipe(inode); 191c3810608S\"J. Bruce Fields\ if (res) 192c3810608S\"J. Bruce Fields\ goto out; 193c3810608S\"J. Bruce Fields\ } 1941da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1951da177e4SLinus Torvalds rpci->nreaders++; 1961da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1971da177e4SLinus Torvalds rpci->nwriters++; 1981da177e4SLinus Torvalds res = 0; 199c3810608S\"J. Bruce Fields\ out: 2001b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2011da177e4SLinus Torvalds return res; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds static int 2051da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2061da177e4SLinus Torvalds { 207969b7f25STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2081da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 209e712804aS\"J. Bruce Fields\ int last_close; 2101da177e4SLinus Torvalds 2111b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2121da177e4SLinus Torvalds if (rpci->ops == NULL) 2131da177e4SLinus Torvalds goto out; 214655b5bb4SJoe Perches msg = filp->private_data; 2151da177e4SLinus Torvalds if (msg != NULL) { 2169842ef35STrond Myklebust spin_lock(&inode->i_lock); 21748e49187STrond Myklebust msg->errno = -EAGAIN; 2185a67657aSTrond Myklebust list_del_init(&msg->list); 2199842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2201da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 2231da177e4SLinus Torvalds rpci->nwriters --; 2249842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 2251da177e4SLinus Torvalds rpci->nreaders --; 2269842ef35STrond Myklebust if (rpci->nreaders == 0) { 2279842ef35STrond Myklebust LIST_HEAD(free_list); 2289842ef35STrond Myklebust spin_lock(&inode->i_lock); 2299842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 2309842ef35STrond Myklebust rpci->pipelen = 0; 2319842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2329842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, 2339842ef35STrond Myklebust rpci->ops->destroy_msg, -EAGAIN); 2349842ef35STrond Myklebust } 2359842ef35STrond Myklebust } 236e712804aS\"J. Bruce Fields\ last_close = rpci->nwriters == 0 && rpci->nreaders == 0; 237e712804aS\"J. Bruce Fields\ if (last_close && rpci->ops->release_pipe) 2381da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 2391da177e4SLinus Torvalds out: 2401b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2411da177e4SLinus Torvalds return 0; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds static ssize_t 2451da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2461da177e4SLinus Torvalds { 247303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2481da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2491da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2501da177e4SLinus Torvalds int res = 0; 2511da177e4SLinus Torvalds 2521b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2531da177e4SLinus Torvalds if (rpci->ops == NULL) { 2541da177e4SLinus Torvalds res = -EPIPE; 2551da177e4SLinus Torvalds goto out_unlock; 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds msg = filp->private_data; 2581da177e4SLinus Torvalds if (msg == NULL) { 2599842ef35STrond Myklebust spin_lock(&inode->i_lock); 2601da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) { 2611da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, 2621da177e4SLinus Torvalds struct rpc_pipe_msg, 2631da177e4SLinus Torvalds list); 2641da177e4SLinus Torvalds list_move(&msg->list, &rpci->in_upcall); 2651da177e4SLinus Torvalds rpci->pipelen -= msg->len; 2661da177e4SLinus Torvalds filp->private_data = msg; 2671da177e4SLinus Torvalds msg->copied = 0; 2681da177e4SLinus Torvalds } 2699842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2701da177e4SLinus Torvalds if (msg == NULL) 2711da177e4SLinus Torvalds goto out_unlock; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 2741da177e4SLinus Torvalds res = rpci->ops->upcall(filp, msg, buf, len); 2751da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 2761da177e4SLinus Torvalds filp->private_data = NULL; 2779842ef35STrond Myklebust spin_lock(&inode->i_lock); 2785a67657aSTrond Myklebust list_del_init(&msg->list); 2799842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2801da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds out_unlock: 2831b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2841da177e4SLinus Torvalds return res; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds static ssize_t 2881da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 2891da177e4SLinus Torvalds { 290303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2911da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2921da177e4SLinus Torvalds int res; 2931da177e4SLinus Torvalds 2941b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2951da177e4SLinus Torvalds res = -EPIPE; 2961da177e4SLinus Torvalds if (rpci->ops != NULL) 2971da177e4SLinus Torvalds res = rpci->ops->downcall(filp, buf, len); 2981b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2991da177e4SLinus Torvalds return res; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static unsigned int 3031da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds struct rpc_inode *rpci; 3061da177e4SLinus Torvalds unsigned int mask = 0; 3071da177e4SLinus Torvalds 308303b46bbSJosef Sipek rpci = RPC_I(filp->f_path.dentry->d_inode); 3091da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 3121da177e4SLinus Torvalds if (rpci->ops == NULL) 3131da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 314eda4f9b7SJ. Bruce Fields if (filp->private_data || !list_empty(&rpci->pipe)) 3151da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 3161da177e4SLinus Torvalds return mask; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 319a6f8dbc6SArnd Bergmann static long 320a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3211da177e4SLinus Torvalds { 322a6f8dbc6SArnd Bergmann struct inode *inode = filp->f_path.dentry->d_inode; 323a6f8dbc6SArnd Bergmann struct rpc_inode *rpci = RPC_I(inode); 3241da177e4SLinus Torvalds int len; 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds switch (cmd) { 3271da177e4SLinus Torvalds case FIONREAD: 328a6f8dbc6SArnd Bergmann spin_lock(&inode->i_lock); 329a6f8dbc6SArnd Bergmann if (rpci->ops == NULL) { 330a6f8dbc6SArnd Bergmann spin_unlock(&inode->i_lock); 3311da177e4SLinus Torvalds return -EPIPE; 332a6f8dbc6SArnd Bergmann } 3331da177e4SLinus Torvalds len = rpci->pipelen; 3341da177e4SLinus Torvalds if (filp->private_data) { 3351da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 336655b5bb4SJoe Perches msg = filp->private_data; 3371da177e4SLinus Torvalds len += msg->len - msg->copied; 3381da177e4SLinus Torvalds } 339a6f8dbc6SArnd Bergmann spin_unlock(&inode->i_lock); 3401da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3411da177e4SLinus Torvalds default: 3421da177e4SLinus Torvalds return -EINVAL; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 346da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3471da177e4SLinus Torvalds .owner = THIS_MODULE, 3481da177e4SLinus Torvalds .llseek = no_llseek, 3491da177e4SLinus Torvalds .read = rpc_pipe_read, 3501da177e4SLinus Torvalds .write = rpc_pipe_write, 3511da177e4SLinus Torvalds .poll = rpc_pipe_poll, 352674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3531da177e4SLinus Torvalds .open = rpc_pipe_open, 3541da177e4SLinus Torvalds .release = rpc_pipe_release, 3551da177e4SLinus Torvalds }; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds static int 3581da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3591da177e4SLinus Torvalds { 3601da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3631da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3641da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 365e7f78657SChuck Lever seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 366e7f78657SChuck Lever seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); 367bf19aaceSJ. Bruce Fields seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); 3681da177e4SLinus Torvalds return 0; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static int 3721da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 3731da177e4SLinus Torvalds { 374006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 3751da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds if (!ret) { 3781da177e4SLinus Torvalds struct seq_file *m = file->private_data; 379006abe88STrond Myklebust 380006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 381006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 3821da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 383006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 384006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 3851da177e4SLinus Torvalds m->private = clnt; 3861da177e4SLinus Torvalds } else { 387006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 3881da177e4SLinus Torvalds single_release(inode, file); 3891da177e4SLinus Torvalds ret = -EINVAL; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds return ret; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds static int 3961da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 3971da177e4SLinus Torvalds { 3981da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3991da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds if (clnt) 4021da177e4SLinus Torvalds rpc_release_client(clnt); 4031da177e4SLinus Torvalds return single_release(inode, file); 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 406da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4071da177e4SLinus Torvalds .owner = THIS_MODULE, 4081da177e4SLinus Torvalds .open = rpc_info_open, 4091da177e4SLinus Torvalds .read = seq_read, 4101da177e4SLinus Torvalds .llseek = seq_lseek, 4111da177e4SLinus Torvalds .release = rpc_info_release, 4121da177e4SLinus Torvalds }; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* 4161da177e4SLinus Torvalds * Description of fs contents. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds struct rpc_filelist { 419ac6feceeSTrond Myklebust const char *name; 42099ac48f5SArjan van de Ven const struct file_operations *i_fop; 4217364af6aSTrond Myklebust umode_t mode; 4221da177e4SLinus Torvalds }; 4231da177e4SLinus Torvalds 42454281548STrond Myklebust struct vfsmount *rpc_get_mount(void) 4251da177e4SLinus Torvalds { 42654281548STrond Myklebust int err; 42754281548STrond Myklebust 428fc14f2feSAl Viro err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); 42954281548STrond Myklebust if (err != 0) 43054281548STrond Myklebust return ERR_PTR(err); 431fc14f2feSAl Viro return rpc_mnt; 4321da177e4SLinus Torvalds } 433e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_get_mount); 4341da177e4SLinus Torvalds 43554281548STrond Myklebust void rpc_put_mount(void) 4361da177e4SLinus Torvalds { 437fc14f2feSAl Viro simple_release_fs(&rpc_mnt, &rpc_mount_count); 4381da177e4SLinus Torvalds } 439e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_put_mount); 4401da177e4SLinus Torvalds 441fe15ce44SNick Piggin static int rpc_delete_dentry(const struct dentry *dentry) 44262e1761cSTrond Myklebust { 44362e1761cSTrond Myklebust return 1; 44462e1761cSTrond Myklebust } 44562e1761cSTrond Myklebust 4463ba13d17SAl Viro static const struct dentry_operations rpc_dentry_operations = { 44762e1761cSTrond Myklebust .d_delete = rpc_delete_dentry, 44862e1761cSTrond Myklebust }; 44962e1761cSTrond Myklebust 4501da177e4SLinus Torvalds static struct inode * 4517364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4521da177e4SLinus Torvalds { 4531da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4541da177e4SLinus Torvalds if (!inode) 4551da177e4SLinus Torvalds return NULL; 45685fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4571da177e4SLinus Torvalds inode->i_mode = mode; 4581da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4591da177e4SLinus Torvalds switch (mode & S_IFMT) { 4601da177e4SLinus Torvalds case S_IFDIR: 4611da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4621da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 463d8c76e6fSDave Hansen inc_nlink(inode); 4641da177e4SLinus Torvalds default: 4651da177e4SLinus Torvalds break; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds return inode; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4707589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 4717589806eSTrond Myklebust umode_t mode, 4727589806eSTrond Myklebust const struct file_operations *i_fop, 4737589806eSTrond Myklebust void *private) 4747589806eSTrond Myklebust { 4757589806eSTrond Myklebust struct inode *inode; 4767589806eSTrond Myklebust 477beb0f0a9STrond Myklebust d_drop(dentry); 4787589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 4797589806eSTrond Myklebust if (!inode) 4807589806eSTrond Myklebust goto out_err; 4817589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 4827589806eSTrond Myklebust if (i_fop) 4837589806eSTrond Myklebust inode->i_fop = i_fop; 4847589806eSTrond Myklebust if (private) 4857589806eSTrond Myklebust rpc_inode_setowner(inode, private); 4867589806eSTrond Myklebust d_add(dentry, inode); 4877589806eSTrond Myklebust return 0; 4887589806eSTrond Myklebust out_err: 4897589806eSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 4907589806eSTrond Myklebust __FILE__, __func__, dentry->d_name.name); 4917589806eSTrond Myklebust dput(dentry); 4927589806eSTrond Myklebust return -ENOMEM; 4937589806eSTrond Myklebust } 4947589806eSTrond Myklebust 495ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 496ac6feceeSTrond Myklebust umode_t mode, 497ac6feceeSTrond Myklebust const struct file_operations *i_fop, 498ac6feceeSTrond Myklebust void *private) 499ac6feceeSTrond Myklebust { 500ac6feceeSTrond Myklebust int err; 501ac6feceeSTrond Myklebust 502ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 503ac6feceeSTrond Myklebust if (err) 504ac6feceeSTrond Myklebust return err; 505ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 506ac6feceeSTrond Myklebust return 0; 507ac6feceeSTrond Myklebust } 508ac6feceeSTrond Myklebust 5097589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5107589806eSTrond Myklebust umode_t mode, 5117589806eSTrond Myklebust const struct file_operations *i_fop, 5127589806eSTrond Myklebust void *private) 5137589806eSTrond Myklebust { 5147589806eSTrond Myklebust int err; 5157589806eSTrond Myklebust 5167589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5177589806eSTrond Myklebust if (err) 5187589806eSTrond Myklebust return err; 5197589806eSTrond Myklebust inc_nlink(dir); 5207589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5217589806eSTrond Myklebust return 0; 5227589806eSTrond Myklebust } 5237589806eSTrond Myklebust 5247589806eSTrond Myklebust static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, 5257589806eSTrond Myklebust umode_t mode, 5267589806eSTrond Myklebust const struct file_operations *i_fop, 5277589806eSTrond Myklebust void *private, 5287589806eSTrond Myklebust const struct rpc_pipe_ops *ops, 5297589806eSTrond Myklebust int flags) 5307589806eSTrond Myklebust { 5317589806eSTrond Myklebust struct rpc_inode *rpci; 5327589806eSTrond Myklebust int err; 5337589806eSTrond Myklebust 5347589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 5357589806eSTrond Myklebust if (err) 5367589806eSTrond Myklebust return err; 5377589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 5387589806eSTrond Myklebust rpci->nkern_readwriters = 1; 5397589806eSTrond Myklebust rpci->private = private; 5407589806eSTrond Myklebust rpci->flags = flags; 5417589806eSTrond Myklebust rpci->ops = ops; 5427589806eSTrond Myklebust fsnotify_create(dir, dentry); 5437589806eSTrond Myklebust return 0; 5447589806eSTrond Myklebust } 5457589806eSTrond Myklebust 546ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 547ac6feceeSTrond Myklebust { 548ac6feceeSTrond Myklebust int ret; 549ac6feceeSTrond Myklebust 550ac6feceeSTrond Myklebust dget(dentry); 551ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 552ac6feceeSTrond Myklebust d_delete(dentry); 553ac6feceeSTrond Myklebust dput(dentry); 554ac6feceeSTrond Myklebust return ret; 555ac6feceeSTrond Myklebust } 556ac6feceeSTrond Myklebust 557810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 558810d90bcSTrond Myklebust { 559810d90bcSTrond Myklebust int ret; 560810d90bcSTrond Myklebust 561810d90bcSTrond Myklebust dget(dentry); 562810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 563810d90bcSTrond Myklebust d_delete(dentry); 564810d90bcSTrond Myklebust dput(dentry); 565810d90bcSTrond Myklebust return ret; 566810d90bcSTrond Myklebust } 567810d90bcSTrond Myklebust 568810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 569810d90bcSTrond Myklebust { 570810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 571810d90bcSTrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 572810d90bcSTrond Myklebust 573810d90bcSTrond Myklebust rpci->nkern_readwriters--; 574810d90bcSTrond Myklebust if (rpci->nkern_readwriters != 0) 575810d90bcSTrond Myklebust return 0; 576810d90bcSTrond Myklebust rpc_close_pipes(inode); 577810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 578810d90bcSTrond Myklebust } 579810d90bcSTrond Myklebust 580cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create(struct dentry *parent, 581cfeaa4a3STrond Myklebust struct qstr *name) 582cfeaa4a3STrond Myklebust { 583cfeaa4a3STrond Myklebust struct dentry *dentry; 584cfeaa4a3STrond Myklebust 585cfeaa4a3STrond Myklebust dentry = d_lookup(parent, name); 586cfeaa4a3STrond Myklebust if (!dentry) { 587cfeaa4a3STrond Myklebust dentry = d_alloc(parent, name); 588cfeaa4a3STrond Myklebust if (!dentry) { 589cfeaa4a3STrond Myklebust dentry = ERR_PTR(-ENOMEM); 590cfeaa4a3STrond Myklebust goto out_err; 591cfeaa4a3STrond Myklebust } 592cfeaa4a3STrond Myklebust } 593cfeaa4a3STrond Myklebust if (!dentry->d_inode) 594fb045adbSNick Piggin d_set_d_op(dentry, &rpc_dentry_operations); 595cfeaa4a3STrond Myklebust out_err: 596cfeaa4a3STrond Myklebust return dentry; 597cfeaa4a3STrond Myklebust } 598cfeaa4a3STrond Myklebust 599cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 600cfeaa4a3STrond Myklebust struct qstr *name) 601cfeaa4a3STrond Myklebust { 602cfeaa4a3STrond Myklebust struct dentry *dentry; 603cfeaa4a3STrond Myklebust 604cfeaa4a3STrond Myklebust dentry = __rpc_lookup_create(parent, name); 605f1f0abe1SDan Carpenter if (IS_ERR(dentry)) 606f1f0abe1SDan Carpenter return dentry; 607cfeaa4a3STrond Myklebust if (dentry->d_inode == NULL) 608cfeaa4a3STrond Myklebust return dentry; 609cfeaa4a3STrond Myklebust dput(dentry); 610cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 611cfeaa4a3STrond Myklebust } 612cfeaa4a3STrond Myklebust 6131da177e4SLinus Torvalds /* 6141da177e4SLinus Torvalds * FIXME: This probably has races. 6151da177e4SLinus Torvalds */ 616ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 617ac6feceeSTrond Myklebust const struct rpc_filelist *files, 618ac6feceeSTrond Myklebust int start, int eof) 6191da177e4SLinus Torvalds { 6201da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 621ac6feceeSTrond Myklebust struct dentry *dentry; 622ac6feceeSTrond Myklebust struct qstr name; 623ac6feceeSTrond Myklebust int i; 624ac6feceeSTrond Myklebust 625ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 626ac6feceeSTrond Myklebust name.name = files[i].name; 627ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 628ac6feceeSTrond Myklebust name.hash = full_name_hash(name.name, name.len); 629ac6feceeSTrond Myklebust dentry = d_lookup(parent, &name); 630ac6feceeSTrond Myklebust 631ac6feceeSTrond Myklebust if (dentry == NULL) 632ac6feceeSTrond Myklebust continue; 633ac6feceeSTrond Myklebust if (dentry->d_inode == NULL) 634ac6feceeSTrond Myklebust goto next; 635ac6feceeSTrond Myklebust switch (dentry->d_inode->i_mode & S_IFMT) { 636ac6feceeSTrond Myklebust default: 637ac6feceeSTrond Myklebust BUG(); 638ac6feceeSTrond Myklebust case S_IFREG: 639ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 640ac6feceeSTrond Myklebust break; 641ac6feceeSTrond Myklebust case S_IFDIR: 642ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 643ac6feceeSTrond Myklebust } 644ac6feceeSTrond Myklebust next: 645ac6feceeSTrond Myklebust dput(dentry); 646ac6feceeSTrond Myklebust } 647ac6feceeSTrond Myklebust } 648ac6feceeSTrond Myklebust 649ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 650ac6feceeSTrond Myklebust const struct rpc_filelist *files, 651ac6feceeSTrond Myklebust int start, int eof) 652ac6feceeSTrond Myklebust { 653ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 6541da177e4SLinus Torvalds 655c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); 656ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 6571b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 660ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 661ac6feceeSTrond Myklebust const struct rpc_filelist *files, 662ac6feceeSTrond Myklebust int start, int eof, 663ac6feceeSTrond Myklebust void *private) 6641da177e4SLinus Torvalds { 665ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 6661da177e4SLinus Torvalds struct dentry *dentry; 667ac6feceeSTrond Myklebust int i, err; 6681da177e4SLinus Torvalds 6691b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 6701da177e4SLinus Torvalds for (i = start; i < eof; i++) { 671ac6feceeSTrond Myklebust struct qstr q; 672ac6feceeSTrond Myklebust 673ac6feceeSTrond Myklebust q.name = files[i].name; 674ac6feceeSTrond Myklebust q.len = strlen(files[i].name); 675ac6feceeSTrond Myklebust q.hash = full_name_hash(q.name, q.len); 676ac6feceeSTrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, &q); 677ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 678ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 6791da177e4SLinus Torvalds goto out_bad; 680ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 681ac6feceeSTrond Myklebust default: 682ac6feceeSTrond Myklebust BUG(); 683ac6feceeSTrond Myklebust case S_IFREG: 684ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 685ac6feceeSTrond Myklebust files[i].mode, 686ac6feceeSTrond Myklebust files[i].i_fop, 687ac6feceeSTrond Myklebust private); 688ac6feceeSTrond Myklebust break; 689ac6feceeSTrond Myklebust case S_IFDIR: 690ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 691ac6feceeSTrond Myklebust files[i].mode, 692ac6feceeSTrond Myklebust NULL, 693ac6feceeSTrond Myklebust private); 6941da177e4SLinus Torvalds } 695ac6feceeSTrond Myklebust if (err != 0) 696ac6feceeSTrond Myklebust goto out_bad; 6971da177e4SLinus Torvalds } 6981b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 6991da177e4SLinus Torvalds return 0; 7001da177e4SLinus Torvalds out_bad: 701ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7021b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7031da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 7040dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name); 705ac6feceeSTrond Myklebust return err; 706f134585aSTrond Myklebust } 707f134585aSTrond Myklebust 708e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 709e57aed77STrond Myklebust struct qstr *name, umode_t mode, void *private, 710e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 711f134585aSTrond Myklebust { 712f134585aSTrond Myklebust struct dentry *dentry; 7137d59d1e8STrond Myklebust struct inode *dir = parent->d_inode; 714f134585aSTrond Myklebust int error; 715f134585aSTrond Myklebust 7167d59d1e8STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 7177d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 718f134585aSTrond Myklebust if (IS_ERR(dentry)) 7197d59d1e8STrond Myklebust goto out; 7207d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7217589806eSTrond Myklebust if (error != 0) 7227589806eSTrond Myklebust goto out_err; 723e57aed77STrond Myklebust if (populate != NULL) { 724e57aed77STrond Myklebust error = populate(dentry, args_populate); 725f134585aSTrond Myklebust if (error) 726ac6feceeSTrond Myklebust goto err_rmdir; 727e57aed77STrond Myklebust } 728f134585aSTrond Myklebust out: 7291b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7305c3e985aSTrond Myklebust return dentry; 731ac6feceeSTrond Myklebust err_rmdir: 732f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7337589806eSTrond Myklebust out_err: 734f134585aSTrond Myklebust dentry = ERR_PTR(error); 735f134585aSTrond Myklebust goto out; 736f134585aSTrond Myklebust } 737f134585aSTrond Myklebust 738e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 739e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 740f134585aSTrond Myklebust { 741dff02cc1STrond Myklebust struct dentry *parent; 742f134585aSTrond Myklebust struct inode *dir; 743f134585aSTrond Myklebust int error; 744f134585aSTrond Myklebust 745dff02cc1STrond Myklebust parent = dget_parent(dentry); 746dff02cc1STrond Myklebust dir = parent->d_inode; 747c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 748e57aed77STrond Myklebust if (depopulate != NULL) 749e57aed77STrond Myklebust depopulate(dentry); 750f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 7511b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 752dff02cc1STrond Myklebust dput(parent); 753f134585aSTrond Myklebust return error; 754f134585aSTrond Myklebust } 7551da177e4SLinus Torvalds 75693a44a75SJ. Bruce Fields /** 75793a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 75893a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 75993a44a75SJ. Bruce Fields * @name: name of pipe 76093a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 76193a44a75SJ. Bruce Fields * @ops: operations defining the behavior of the pipe: upcall, downcall, 762c3810608S\"J. Bruce Fields\ * release_pipe, open_pipe, and destroy_msg. 76365b6e42cSRandy Dunlap * @flags: rpc_inode flags 76493a44a75SJ. Bruce Fields * 76593a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 76693a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 76793a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 76893a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 76993a44a75SJ. Bruce Fields * 77093a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 77193a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 77293a44a75SJ. Bruce Fields * 77393a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 77493a44a75SJ. Bruce Fields * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. 77593a44a75SJ. Bruce Fields */ 776b693ba4aSTrond Myklebust struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, 777b693ba4aSTrond Myklebust void *private, const struct rpc_pipe_ops *ops, 778b693ba4aSTrond Myklebust int flags) 7791da177e4SLinus Torvalds { 7801da177e4SLinus Torvalds struct dentry *dentry; 7817589806eSTrond Myklebust struct inode *dir = parent->d_inode; 7827364af6aSTrond Myklebust umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; 783cfeaa4a3STrond Myklebust struct qstr q; 7847589806eSTrond Myklebust int err; 7857364af6aSTrond Myklebust 7867364af6aSTrond Myklebust if (ops->upcall == NULL) 7877364af6aSTrond Myklebust umode &= ~S_IRUGO; 7887364af6aSTrond Myklebust if (ops->downcall == NULL) 7897364af6aSTrond Myklebust umode &= ~S_IWUGO; 7901da177e4SLinus Torvalds 791cfeaa4a3STrond Myklebust q.name = name; 792cfeaa4a3STrond Myklebust q.len = strlen(name); 793cfeaa4a3STrond Myklebust q.hash = full_name_hash(q.name, q.len), 794cfeaa4a3STrond Myklebust 795cfeaa4a3STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 796cfeaa4a3STrond Myklebust dentry = __rpc_lookup_create(parent, &q); 7971da177e4SLinus Torvalds if (IS_ERR(dentry)) 798cfeaa4a3STrond Myklebust goto out; 79934f30896STrond Myklebust if (dentry->d_inode) { 8007589806eSTrond Myklebust struct rpc_inode *rpci = RPC_I(dentry->d_inode); 80134f30896STrond Myklebust if (rpci->private != private || 80234f30896STrond Myklebust rpci->ops != ops || 80334f30896STrond Myklebust rpci->flags != flags) { 80434f30896STrond Myklebust dput (dentry); 805810d90bcSTrond Myklebust err = -EBUSY; 806810d90bcSTrond Myklebust goto out_err; 80734f30896STrond Myklebust } 80803a1256fSTrond Myklebust rpci->nkern_readwriters++; 80934f30896STrond Myklebust goto out; 81034f30896STrond Myklebust } 8117589806eSTrond Myklebust 8127589806eSTrond Myklebust err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, 8137589806eSTrond Myklebust private, ops, flags); 8147589806eSTrond Myklebust if (err) 8157589806eSTrond Myklebust goto out_err; 816f134585aSTrond Myklebust out: 8171b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8185c3e985aSTrond Myklebust return dentry; 8197589806eSTrond Myklebust out_err: 8207589806eSTrond Myklebust dentry = ERR_PTR(err); 821158998b6STrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", 8220dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name, name, 8237589806eSTrond Myklebust err); 824f134585aSTrond Myklebust goto out; 8251da177e4SLinus Torvalds } 826468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_mkpipe); 8271da177e4SLinus Torvalds 82893a44a75SJ. Bruce Fields /** 82993a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 83093a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 83193a44a75SJ. Bruce Fields * 83293a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 83393a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 83493a44a75SJ. Bruce Fields * return -EPIPE. 83593a44a75SJ. Bruce Fields */ 836f134585aSTrond Myklebust int 8375d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8381da177e4SLinus Torvalds { 8395d67476fSTrond Myklebust struct dentry *parent; 840f134585aSTrond Myklebust struct inode *dir; 8415d67476fSTrond Myklebust int error = 0; 8421da177e4SLinus Torvalds 8435d67476fSTrond Myklebust parent = dget_parent(dentry); 8445d67476fSTrond Myklebust dir = parent->d_inode; 845c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 846810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8471b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8485d67476fSTrond Myklebust dput(parent); 849f134585aSTrond Myklebust return error; 8501da177e4SLinus Torvalds } 851468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8521da177e4SLinus Torvalds 853e57aed77STrond Myklebust enum { 854e57aed77STrond Myklebust RPCAUTH_info, 855e57aed77STrond Myklebust RPCAUTH_EOF 856e57aed77STrond Myklebust }; 857e57aed77STrond Myklebust 858e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 859e57aed77STrond Myklebust [RPCAUTH_info] = { 860e57aed77STrond Myklebust .name = "info", 861e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 862e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 863e57aed77STrond Myklebust }, 864e57aed77STrond Myklebust }; 865e57aed77STrond Myklebust 866e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 867e57aed77STrond Myklebust { 868e57aed77STrond Myklebust return rpc_populate(dentry, 869e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 870e57aed77STrond Myklebust private); 871e57aed77STrond Myklebust } 872e57aed77STrond Myklebust 873e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 874e57aed77STrond Myklebust { 875e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 876e57aed77STrond Myklebust } 877e57aed77STrond Myklebust 8787d59d1e8STrond Myklebust /** 8797d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 8804111d4fdSRandy Dunlap * @dentry: dentry from the rpc_pipefs root to the new directory 8814111d4fdSRandy Dunlap * @name: &struct qstr for the name 8827d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 8837d59d1e8STrond Myklebust * 8847d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 8857d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 8867d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 8877d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 8887d59d1e8STrond Myklebust */ 88923ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 89023ac6581STrond Myklebust struct qstr *name, 8917d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 8927d59d1e8STrond Myklebust { 893e57aed77STrond Myklebust return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 894e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 895e57aed77STrond Myklebust } 896e57aed77STrond Myklebust 897e57aed77STrond Myklebust /** 898e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 899e57aed77STrond Myklebust * @dentry: directory to remove 900e57aed77STrond Myklebust */ 901e57aed77STrond Myklebust int rpc_remove_client_dir(struct dentry *dentry) 902e57aed77STrond Myklebust { 903e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 9047d59d1e8STrond Myklebust } 9057d59d1e8STrond Myklebust 9068854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 9078854e82dSTrond Myklebust [0] = { 9088854e82dSTrond Myklebust .name = "channel", 9098854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 91096c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9118854e82dSTrond Myklebust }, 9128854e82dSTrond Myklebust [1] = { 9138854e82dSTrond Myklebust .name = "content", 9148854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 9158854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 9168854e82dSTrond Myklebust }, 9178854e82dSTrond Myklebust [2] = { 9188854e82dSTrond Myklebust .name = "flush", 9198854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 9208854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9218854e82dSTrond Myklebust }, 9228854e82dSTrond Myklebust }; 9238854e82dSTrond Myklebust 9248854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 9258854e82dSTrond Myklebust { 9268854e82dSTrond Myklebust return rpc_populate(dentry, 9278854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 9288854e82dSTrond Myklebust private); 9298854e82dSTrond Myklebust } 9308854e82dSTrond Myklebust 9318854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 9328854e82dSTrond Myklebust { 9338854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 9348854e82dSTrond Myklebust } 9358854e82dSTrond Myklebust 9368854e82dSTrond Myklebust struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, 9378854e82dSTrond Myklebust mode_t umode, struct cache_detail *cd) 9388854e82dSTrond Myklebust { 9398854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 9408854e82dSTrond Myklebust rpc_cachedir_populate, cd); 9418854e82dSTrond Myklebust } 9428854e82dSTrond Myklebust 9438854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 9448854e82dSTrond Myklebust { 9458854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 9468854e82dSTrond Myklebust } 9478854e82dSTrond Myklebust 9481da177e4SLinus Torvalds /* 9491da177e4SLinus Torvalds * populate the filesystem 9501da177e4SLinus Torvalds */ 951b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 9521da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 9531da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 9541da177e4SLinus Torvalds .statfs = simple_statfs, 9551da177e4SLinus Torvalds }; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 9581da177e4SLinus Torvalds 959bb156749STrond Myklebust /* 960bb156749STrond Myklebust * We have a single directory with 1 node in it. 961bb156749STrond Myklebust */ 962bb156749STrond Myklebust enum { 963bb156749STrond Myklebust RPCAUTH_lockd, 964bb156749STrond Myklebust RPCAUTH_mount, 965bb156749STrond Myklebust RPCAUTH_nfs, 966bb156749STrond Myklebust RPCAUTH_portmap, 967bb156749STrond Myklebust RPCAUTH_statd, 968bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 969e571cbf1STrond Myklebust RPCAUTH_cache, 970bb156749STrond Myklebust RPCAUTH_RootEOF 971bb156749STrond Myklebust }; 972bb156749STrond Myklebust 973bb156749STrond Myklebust static const struct rpc_filelist files[] = { 974bb156749STrond Myklebust [RPCAUTH_lockd] = { 975bb156749STrond Myklebust .name = "lockd", 976bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 977bb156749STrond Myklebust }, 978bb156749STrond Myklebust [RPCAUTH_mount] = { 979bb156749STrond Myklebust .name = "mount", 980bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 981bb156749STrond Myklebust }, 982bb156749STrond Myklebust [RPCAUTH_nfs] = { 983bb156749STrond Myklebust .name = "nfs", 984bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 985bb156749STrond Myklebust }, 986bb156749STrond Myklebust [RPCAUTH_portmap] = { 987bb156749STrond Myklebust .name = "portmap", 988bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 989bb156749STrond Myklebust }, 990bb156749STrond Myklebust [RPCAUTH_statd] = { 991bb156749STrond Myklebust .name = "statd", 992bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 993bb156749STrond Myklebust }, 994bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 995bb156749STrond Myklebust .name = "nfsd4_cb", 996bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 997bb156749STrond Myklebust }, 998e571cbf1STrond Myklebust [RPCAUTH_cache] = { 999e571cbf1STrond Myklebust .name = "cache", 1000e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1001e571cbf1STrond Myklebust }, 1002bb156749STrond Myklebust }; 1003bb156749STrond Myklebust 10041da177e4SLinus Torvalds static int 10051da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 10061da177e4SLinus Torvalds { 10071da177e4SLinus Torvalds struct inode *inode; 10081da177e4SLinus Torvalds struct dentry *root; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 10111da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 10121da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 10131da177e4SLinus Torvalds sb->s_op = &s_ops; 10141da177e4SLinus Torvalds sb->s_time_gran = 1; 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 10171da177e4SLinus Torvalds if (!inode) 10181da177e4SLinus Torvalds return -ENOMEM; 1019fc7bed8cSAl Viro sb->s_root = root = d_alloc_root(inode); 10201da177e4SLinus Torvalds if (!root) { 10211da177e4SLinus Torvalds iput(inode); 10221da177e4SLinus Torvalds return -ENOMEM; 10231da177e4SLinus Torvalds } 1024ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 10251da177e4SLinus Torvalds return -ENOMEM; 1026fc7bed8cSAl Viro return 0; 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 1029fc14f2feSAl Viro static struct dentry * 1030fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1031fc14f2feSAl Viro int flags, const char *dev_name, void *data) 10321da177e4SLinus Torvalds { 1033fc14f2feSAl Viro return mount_single(fs_type, flags, data, rpc_fill_super); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 10371da177e4SLinus Torvalds .owner = THIS_MODULE, 10381da177e4SLinus Torvalds .name = "rpc_pipefs", 1039fc14f2feSAl Viro .mount = rpc_mount, 10401da177e4SLinus Torvalds .kill_sb = kill_litter_super, 10411da177e4SLinus Torvalds }; 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds static void 104451cc5068SAlexey Dobriyan init_once(void *foo) 10451da177e4SLinus Torvalds { 10461da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 10491da177e4SLinus Torvalds rpci->private = NULL; 10501da177e4SLinus Torvalds rpci->nreaders = 0; 10511da177e4SLinus Torvalds rpci->nwriters = 0; 10521da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->in_upcall); 10536e84c7b6STrond Myklebust INIT_LIST_HEAD(&rpci->in_downcall); 10541da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->pipe); 10551da177e4SLinus Torvalds rpci->pipelen = 0; 10561da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 105752bad64dSDavid Howells INIT_DELAYED_WORK(&rpci->queue_timeout, 105865f27f38SDavid Howells rpc_timeout_upcall_queue); 10591da177e4SLinus Torvalds rpci->ops = NULL; 10601da177e4SLinus Torvalds } 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds int register_rpc_pipefs(void) 10631da177e4SLinus Torvalds { 10645bd5f581SAkinobu Mita int err; 10655bd5f581SAkinobu Mita 10661da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 10671da177e4SLinus Torvalds sizeof(struct rpc_inode), 1068fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1069fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 107020c2df83SPaul Mundt init_once); 10711da177e4SLinus Torvalds if (!rpc_inode_cachep) 10721da177e4SLinus Torvalds return -ENOMEM; 10735bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 10745bd5f581SAkinobu Mita if (err) { 10755bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 10765bd5f581SAkinobu Mita return err; 10775bd5f581SAkinobu Mita } 10785bd5f581SAkinobu Mita 10791da177e4SLinus Torvalds return 0; 10801da177e4SLinus Torvalds } 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 10831da177e4SLinus Torvalds { 10841a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 10851da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 10861da177e4SLinus Torvalds } 1087dcbf8c30SMichal Schmidt 1088dcbf8c30SMichal Schmidt /* Make 'mount -t rpc_pipefs ...' autoload this module. */ 1089dcbf8c30SMichal Schmidt MODULE_ALIAS("rpc_pipefs"); 1090