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 80c1225158SPeng Tao ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, 81c1225158SPeng Tao char __user *dst, size_t buflen) 82c1225158SPeng Tao { 83c1225158SPeng Tao char *data = (char *)msg->data + msg->copied; 84c1225158SPeng Tao size_t mlen = min(msg->len - msg->copied, buflen); 85c1225158SPeng Tao unsigned long left; 86c1225158SPeng Tao 87c1225158SPeng Tao left = copy_to_user(dst, data, mlen); 88c1225158SPeng Tao if (left == mlen) { 89c1225158SPeng Tao msg->errno = -EFAULT; 90c1225158SPeng Tao return -EFAULT; 91c1225158SPeng Tao } 92c1225158SPeng Tao 93c1225158SPeng Tao mlen -= left; 94c1225158SPeng Tao msg->copied += mlen; 95c1225158SPeng Tao msg->errno = 0; 96c1225158SPeng Tao return mlen; 97c1225158SPeng Tao } 98c1225158SPeng Tao EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 99c1225158SPeng Tao 10093a44a75SJ. Bruce Fields /** 1011a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 10293a44a75SJ. Bruce Fields * @inode: inode of upcall pipe on which to queue given message 10393a44a75SJ. Bruce Fields * @msg: message to queue 10493a44a75SJ. Bruce Fields * 10593a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 10693a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 10793a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 10893a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 10993a44a75SJ. Bruce Fields */ 1101da177e4SLinus Torvalds int 1111da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 1121da177e4SLinus Torvalds { 1131da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1146070fe6fSTrond Myklebust int res = -EPIPE; 1151da177e4SLinus Torvalds 1169842ef35STrond Myklebust spin_lock(&inode->i_lock); 1176070fe6fSTrond Myklebust if (rpci->ops == NULL) 1186070fe6fSTrond Myklebust goto out; 1191da177e4SLinus Torvalds if (rpci->nreaders) { 1201da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 1211da177e4SLinus Torvalds rpci->pipelen += msg->len; 1226070fe6fSTrond Myklebust res = 0; 1231da177e4SLinus Torvalds } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { 1241da177e4SLinus Torvalds if (list_empty(&rpci->pipe)) 12524c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 12624c5d9d7STrond Myklebust &rpci->queue_timeout, 1271da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 1281da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 1291da177e4SLinus Torvalds rpci->pipelen += msg->len; 1306070fe6fSTrond Myklebust res = 0; 1316070fe6fSTrond Myklebust } 1326070fe6fSTrond Myklebust out: 1339842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1341da177e4SLinus Torvalds wake_up(&rpci->waitq); 1351da177e4SLinus Torvalds return res; 1361da177e4SLinus Torvalds } 137468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1381da177e4SLinus Torvalds 1396070fe6fSTrond Myklebust static inline void 1406070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1416070fe6fSTrond Myklebust { 1426070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1436070fe6fSTrond Myklebust } 1446070fe6fSTrond Myklebust 1451da177e4SLinus Torvalds static void 1461da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 149b693ba4aSTrond Myklebust const struct rpc_pipe_ops *ops; 150e712804aS\"J. Bruce Fields\ int need_release; 1511da177e4SLinus Torvalds 1521b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1539842ef35STrond Myklebust ops = rpci->ops; 1549842ef35STrond Myklebust if (ops != NULL) { 1559842ef35STrond Myklebust LIST_HEAD(free_list); 1569842ef35STrond Myklebust spin_lock(&inode->i_lock); 157e712804aS\"J. Bruce Fields\ need_release = rpci->nreaders != 0 || rpci->nwriters != 0; 1581da177e4SLinus Torvalds rpci->nreaders = 0; 1599842ef35STrond Myklebust list_splice_init(&rpci->in_upcall, &free_list); 1609842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 1619842ef35STrond Myklebust rpci->pipelen = 0; 1621da177e4SLinus Torvalds rpci->ops = NULL; 1639842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1649842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); 1659842ef35STrond Myklebust rpci->nwriters = 0; 166e712804aS\"J. Bruce Fields\ if (need_release && ops->release_pipe) 1679842ef35STrond Myklebust ops->release_pipe(inode); 1684011cd97STrond Myklebust cancel_delayed_work_sync(&rpci->queue_timeout); 1691da177e4SLinus Torvalds } 1706070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1711b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds static struct inode * 1751da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1761da177e4SLinus Torvalds { 1771da177e4SLinus Torvalds struct rpc_inode *rpci; 178e94b1766SChristoph Lameter rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); 1791da177e4SLinus Torvalds if (!rpci) 1801da177e4SLinus Torvalds return NULL; 1811da177e4SLinus Torvalds return &rpci->vfs_inode; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds static void 185fa0d7e3dSNick Piggin rpc_i_callback(struct rcu_head *head) 186fa0d7e3dSNick Piggin { 187fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 188fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 189fa0d7e3dSNick Piggin } 190fa0d7e3dSNick Piggin 191fa0d7e3dSNick Piggin static void 1921da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 1931da177e4SLinus Torvalds { 194fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, rpc_i_callback); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds static int 1981da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 201c3810608S\"J. Bruce Fields\ int first_open; 2021da177e4SLinus Torvalds int res = -ENXIO; 2031da177e4SLinus Torvalds 2041b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 205c3810608S\"J. Bruce Fields\ if (rpci->ops == NULL) 206c3810608S\"J. Bruce Fields\ goto out; 207c3810608S\"J. Bruce Fields\ first_open = rpci->nreaders == 0 && rpci->nwriters == 0; 208c3810608S\"J. Bruce Fields\ if (first_open && rpci->ops->open_pipe) { 209c3810608S\"J. Bruce Fields\ res = rpci->ops->open_pipe(inode); 210c3810608S\"J. Bruce Fields\ if (res) 211c3810608S\"J. Bruce Fields\ goto out; 212c3810608S\"J. Bruce Fields\ } 2131da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 2141da177e4SLinus Torvalds rpci->nreaders++; 2151da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 2161da177e4SLinus Torvalds rpci->nwriters++; 2171da177e4SLinus Torvalds res = 0; 218c3810608S\"J. Bruce Fields\ out: 2191b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2201da177e4SLinus Torvalds return res; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static int 2241da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2251da177e4SLinus Torvalds { 226969b7f25STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2271da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 228e712804aS\"J. Bruce Fields\ int last_close; 2291da177e4SLinus Torvalds 2301b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2311da177e4SLinus Torvalds if (rpci->ops == NULL) 2321da177e4SLinus Torvalds goto out; 233655b5bb4SJoe Perches msg = filp->private_data; 2341da177e4SLinus Torvalds if (msg != NULL) { 2359842ef35STrond Myklebust spin_lock(&inode->i_lock); 23648e49187STrond Myklebust msg->errno = -EAGAIN; 2375a67657aSTrond Myklebust list_del_init(&msg->list); 2389842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2391da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 2421da177e4SLinus Torvalds rpci->nwriters --; 2439842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 2441da177e4SLinus Torvalds rpci->nreaders --; 2459842ef35STrond Myklebust if (rpci->nreaders == 0) { 2469842ef35STrond Myklebust LIST_HEAD(free_list); 2479842ef35STrond Myklebust spin_lock(&inode->i_lock); 2489842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 2499842ef35STrond Myklebust rpci->pipelen = 0; 2509842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2519842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, 2529842ef35STrond Myklebust rpci->ops->destroy_msg, -EAGAIN); 2539842ef35STrond Myklebust } 2549842ef35STrond Myklebust } 255e712804aS\"J. Bruce Fields\ last_close = rpci->nwriters == 0 && rpci->nreaders == 0; 256e712804aS\"J. Bruce Fields\ if (last_close && rpci->ops->release_pipe) 2571da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 2581da177e4SLinus Torvalds out: 2591b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2601da177e4SLinus Torvalds return 0; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds static ssize_t 2641da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2651da177e4SLinus Torvalds { 266303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2671da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2681da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2691da177e4SLinus Torvalds int res = 0; 2701da177e4SLinus Torvalds 2711b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2721da177e4SLinus Torvalds if (rpci->ops == NULL) { 2731da177e4SLinus Torvalds res = -EPIPE; 2741da177e4SLinus Torvalds goto out_unlock; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds msg = filp->private_data; 2771da177e4SLinus Torvalds if (msg == NULL) { 2789842ef35STrond Myklebust spin_lock(&inode->i_lock); 2791da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) { 2801da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, 2811da177e4SLinus Torvalds struct rpc_pipe_msg, 2821da177e4SLinus Torvalds list); 2831da177e4SLinus Torvalds list_move(&msg->list, &rpci->in_upcall); 2841da177e4SLinus Torvalds rpci->pipelen -= msg->len; 2851da177e4SLinus Torvalds filp->private_data = msg; 2861da177e4SLinus Torvalds msg->copied = 0; 2871da177e4SLinus Torvalds } 2889842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2891da177e4SLinus Torvalds if (msg == NULL) 2901da177e4SLinus Torvalds goto out_unlock; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 2931da177e4SLinus Torvalds res = rpci->ops->upcall(filp, msg, buf, len); 2941da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 2951da177e4SLinus Torvalds filp->private_data = NULL; 2969842ef35STrond Myklebust spin_lock(&inode->i_lock); 2975a67657aSTrond Myklebust list_del_init(&msg->list); 2989842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2991da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds out_unlock: 3021b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3031da177e4SLinus Torvalds return res; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds static ssize_t 3071da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 3081da177e4SLinus Torvalds { 309303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 3101da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 3111da177e4SLinus Torvalds int res; 3121da177e4SLinus Torvalds 3131b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3141da177e4SLinus Torvalds res = -EPIPE; 3151da177e4SLinus Torvalds if (rpci->ops != NULL) 3161da177e4SLinus Torvalds res = rpci->ops->downcall(filp, buf, len); 3171b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3181da177e4SLinus Torvalds return res; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds static unsigned int 3221da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3231da177e4SLinus Torvalds { 3241da177e4SLinus Torvalds struct rpc_inode *rpci; 3251da177e4SLinus Torvalds unsigned int mask = 0; 3261da177e4SLinus Torvalds 327303b46bbSJosef Sipek rpci = RPC_I(filp->f_path.dentry->d_inode); 3281da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 3311da177e4SLinus Torvalds if (rpci->ops == NULL) 3321da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 333eda4f9b7SJ. Bruce Fields if (filp->private_data || !list_empty(&rpci->pipe)) 3341da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 3351da177e4SLinus Torvalds return mask; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 338a6f8dbc6SArnd Bergmann static long 339a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3401da177e4SLinus Torvalds { 341a6f8dbc6SArnd Bergmann struct inode *inode = filp->f_path.dentry->d_inode; 342a6f8dbc6SArnd Bergmann struct rpc_inode *rpci = RPC_I(inode); 3431da177e4SLinus Torvalds int len; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds switch (cmd) { 3461da177e4SLinus Torvalds case FIONREAD: 347a6f8dbc6SArnd Bergmann spin_lock(&inode->i_lock); 348a6f8dbc6SArnd Bergmann if (rpci->ops == NULL) { 349a6f8dbc6SArnd Bergmann spin_unlock(&inode->i_lock); 3501da177e4SLinus Torvalds return -EPIPE; 351a6f8dbc6SArnd Bergmann } 3521da177e4SLinus Torvalds len = rpci->pipelen; 3531da177e4SLinus Torvalds if (filp->private_data) { 3541da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 355655b5bb4SJoe Perches msg = filp->private_data; 3561da177e4SLinus Torvalds len += msg->len - msg->copied; 3571da177e4SLinus Torvalds } 358a6f8dbc6SArnd Bergmann spin_unlock(&inode->i_lock); 3591da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3601da177e4SLinus Torvalds default: 3611da177e4SLinus Torvalds return -EINVAL; 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 365da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3661da177e4SLinus Torvalds .owner = THIS_MODULE, 3671da177e4SLinus Torvalds .llseek = no_llseek, 3681da177e4SLinus Torvalds .read = rpc_pipe_read, 3691da177e4SLinus Torvalds .write = rpc_pipe_write, 3701da177e4SLinus Torvalds .poll = rpc_pipe_poll, 371674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3721da177e4SLinus Torvalds .open = rpc_pipe_open, 3731da177e4SLinus Torvalds .release = rpc_pipe_release, 3741da177e4SLinus Torvalds }; 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds static int 3771da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3821da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3831da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 384e7f78657SChuck Lever seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 385e7f78657SChuck Lever seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); 386bf19aaceSJ. Bruce Fields seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); 3871da177e4SLinus Torvalds return 0; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds static int 3911da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 3921da177e4SLinus Torvalds { 393006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 3941da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds if (!ret) { 3971da177e4SLinus Torvalds struct seq_file *m = file->private_data; 398006abe88STrond Myklebust 399006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 400006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 4011da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 402006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 403006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4041da177e4SLinus Torvalds m->private = clnt; 4051da177e4SLinus Torvalds } else { 406006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4071da177e4SLinus Torvalds single_release(inode, file); 4081da177e4SLinus Torvalds ret = -EINVAL; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds return ret; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds static int 4151da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds struct seq_file *m = file->private_data; 4181da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds if (clnt) 4211da177e4SLinus Torvalds rpc_release_client(clnt); 4221da177e4SLinus Torvalds return single_release(inode, file); 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 425da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4261da177e4SLinus Torvalds .owner = THIS_MODULE, 4271da177e4SLinus Torvalds .open = rpc_info_open, 4281da177e4SLinus Torvalds .read = seq_read, 4291da177e4SLinus Torvalds .llseek = seq_lseek, 4301da177e4SLinus Torvalds .release = rpc_info_release, 4311da177e4SLinus Torvalds }; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* 4351da177e4SLinus Torvalds * Description of fs contents. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds struct rpc_filelist { 438ac6feceeSTrond Myklebust const char *name; 43999ac48f5SArjan van de Ven const struct file_operations *i_fop; 4407364af6aSTrond Myklebust umode_t mode; 4411da177e4SLinus Torvalds }; 4421da177e4SLinus Torvalds 44354281548STrond Myklebust struct vfsmount *rpc_get_mount(void) 4441da177e4SLinus Torvalds { 44554281548STrond Myklebust int err; 44654281548STrond Myklebust 447fc14f2feSAl Viro err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); 44854281548STrond Myklebust if (err != 0) 44954281548STrond Myklebust return ERR_PTR(err); 450fc14f2feSAl Viro return rpc_mnt; 4511da177e4SLinus Torvalds } 452e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_get_mount); 4531da177e4SLinus Torvalds 45454281548STrond Myklebust void rpc_put_mount(void) 4551da177e4SLinus Torvalds { 456fc14f2feSAl Viro simple_release_fs(&rpc_mnt, &rpc_mount_count); 4571da177e4SLinus Torvalds } 458e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_put_mount); 4591da177e4SLinus Torvalds 460fe15ce44SNick Piggin static int rpc_delete_dentry(const struct dentry *dentry) 46162e1761cSTrond Myklebust { 46262e1761cSTrond Myklebust return 1; 46362e1761cSTrond Myklebust } 46462e1761cSTrond Myklebust 4653ba13d17SAl Viro static const struct dentry_operations rpc_dentry_operations = { 46662e1761cSTrond Myklebust .d_delete = rpc_delete_dentry, 46762e1761cSTrond Myklebust }; 46862e1761cSTrond Myklebust 4691da177e4SLinus Torvalds static struct inode * 4707364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4731da177e4SLinus Torvalds if (!inode) 4741da177e4SLinus Torvalds return NULL; 47585fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4761da177e4SLinus Torvalds inode->i_mode = mode; 4771da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4781da177e4SLinus Torvalds switch (mode & S_IFMT) { 4791da177e4SLinus Torvalds case S_IFDIR: 4801da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4811da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 482d8c76e6fSDave Hansen inc_nlink(inode); 4831da177e4SLinus Torvalds default: 4841da177e4SLinus Torvalds break; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds return inode; 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4897589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 4907589806eSTrond Myklebust umode_t mode, 4917589806eSTrond Myklebust const struct file_operations *i_fop, 4927589806eSTrond Myklebust void *private) 4937589806eSTrond Myklebust { 4947589806eSTrond Myklebust struct inode *inode; 4957589806eSTrond Myklebust 496beb0f0a9STrond Myklebust d_drop(dentry); 4977589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 4987589806eSTrond Myklebust if (!inode) 4997589806eSTrond Myklebust goto out_err; 5007589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 5017589806eSTrond Myklebust if (i_fop) 5027589806eSTrond Myklebust inode->i_fop = i_fop; 5037589806eSTrond Myklebust if (private) 5047589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5057589806eSTrond Myklebust d_add(dentry, inode); 5067589806eSTrond Myklebust return 0; 5077589806eSTrond Myklebust out_err: 5087589806eSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 5097589806eSTrond Myklebust __FILE__, __func__, dentry->d_name.name); 5107589806eSTrond Myklebust dput(dentry); 5117589806eSTrond Myklebust return -ENOMEM; 5127589806eSTrond Myklebust } 5137589806eSTrond Myklebust 514ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 515ac6feceeSTrond Myklebust umode_t mode, 516ac6feceeSTrond Myklebust const struct file_operations *i_fop, 517ac6feceeSTrond Myklebust void *private) 518ac6feceeSTrond Myklebust { 519ac6feceeSTrond Myklebust int err; 520ac6feceeSTrond Myklebust 521ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 522ac6feceeSTrond Myklebust if (err) 523ac6feceeSTrond Myklebust return err; 524ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 525ac6feceeSTrond Myklebust return 0; 526ac6feceeSTrond Myklebust } 527ac6feceeSTrond Myklebust 5287589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5297589806eSTrond Myklebust umode_t mode, 5307589806eSTrond Myklebust const struct file_operations *i_fop, 5317589806eSTrond Myklebust void *private) 5327589806eSTrond Myklebust { 5337589806eSTrond Myklebust int err; 5347589806eSTrond Myklebust 5357589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5367589806eSTrond Myklebust if (err) 5377589806eSTrond Myklebust return err; 5387589806eSTrond Myklebust inc_nlink(dir); 5397589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5407589806eSTrond Myklebust return 0; 5417589806eSTrond Myklebust } 5427589806eSTrond Myklebust 5437589806eSTrond Myklebust static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, 5447589806eSTrond Myklebust umode_t mode, 5457589806eSTrond Myklebust const struct file_operations *i_fop, 5467589806eSTrond Myklebust void *private, 5477589806eSTrond Myklebust const struct rpc_pipe_ops *ops, 5487589806eSTrond Myklebust int flags) 5497589806eSTrond Myklebust { 5507589806eSTrond Myklebust struct rpc_inode *rpci; 5517589806eSTrond Myklebust int err; 5527589806eSTrond Myklebust 5537589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 5547589806eSTrond Myklebust if (err) 5557589806eSTrond Myklebust return err; 5567589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 5577589806eSTrond Myklebust rpci->private = private; 5587589806eSTrond Myklebust rpci->flags = flags; 5597589806eSTrond Myklebust rpci->ops = ops; 5607589806eSTrond Myklebust fsnotify_create(dir, dentry); 5617589806eSTrond Myklebust return 0; 5627589806eSTrond Myklebust } 5637589806eSTrond Myklebust 564ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 565ac6feceeSTrond Myklebust { 566ac6feceeSTrond Myklebust int ret; 567ac6feceeSTrond Myklebust 568ac6feceeSTrond Myklebust dget(dentry); 569ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 570ac6feceeSTrond Myklebust d_delete(dentry); 571ac6feceeSTrond Myklebust dput(dentry); 572ac6feceeSTrond Myklebust return ret; 573ac6feceeSTrond Myklebust } 574ac6feceeSTrond Myklebust 575810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 576810d90bcSTrond Myklebust { 577810d90bcSTrond Myklebust int ret; 578810d90bcSTrond Myklebust 579810d90bcSTrond Myklebust dget(dentry); 580810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 581810d90bcSTrond Myklebust d_delete(dentry); 582810d90bcSTrond Myklebust dput(dentry); 583810d90bcSTrond Myklebust return ret; 584810d90bcSTrond Myklebust } 585810d90bcSTrond Myklebust 586810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 587810d90bcSTrond Myklebust { 588810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 589810d90bcSTrond Myklebust 590810d90bcSTrond Myklebust rpc_close_pipes(inode); 591810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 592810d90bcSTrond Myklebust } 593810d90bcSTrond Myklebust 594cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 595cfeaa4a3STrond Myklebust struct qstr *name) 596cfeaa4a3STrond Myklebust { 597cfeaa4a3STrond Myklebust struct dentry *dentry; 598cfeaa4a3STrond Myklebust 5995bff0386SStanislav Kinsbursky dentry = d_lookup(parent, name); 6005bff0386SStanislav Kinsbursky if (!dentry) { 6015bff0386SStanislav Kinsbursky dentry = d_alloc(parent, name); 6025bff0386SStanislav Kinsbursky if (!dentry) 6035bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6045bff0386SStanislav Kinsbursky } 6055bff0386SStanislav Kinsbursky if (dentry->d_inode == NULL) { 6065bff0386SStanislav Kinsbursky d_set_d_op(dentry, &rpc_dentry_operations); 607f1f0abe1SDan Carpenter return dentry; 6085bff0386SStanislav Kinsbursky } 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); 7965bff0386SStanislav Kinsbursky dentry = __rpc_lookup_create_exclusive(parent, &q); 7971da177e4SLinus Torvalds if (IS_ERR(dentry)) 798cfeaa4a3STrond Myklebust goto out; 7997589806eSTrond Myklebust err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, 8007589806eSTrond Myklebust private, ops, flags); 8017589806eSTrond Myklebust if (err) 8027589806eSTrond Myklebust goto out_err; 803f134585aSTrond Myklebust out: 8041b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8055c3e985aSTrond Myklebust return dentry; 8067589806eSTrond Myklebust out_err: 8077589806eSTrond Myklebust dentry = ERR_PTR(err); 808158998b6STrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", 8090dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name, name, 8107589806eSTrond Myklebust err); 811f134585aSTrond Myklebust goto out; 8121da177e4SLinus Torvalds } 813468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_mkpipe); 8141da177e4SLinus Torvalds 81593a44a75SJ. Bruce Fields /** 81693a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 81793a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 81893a44a75SJ. Bruce Fields * 81993a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 82093a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 82193a44a75SJ. Bruce Fields * return -EPIPE. 82293a44a75SJ. Bruce Fields */ 823f134585aSTrond Myklebust int 8245d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8251da177e4SLinus Torvalds { 8265d67476fSTrond Myklebust struct dentry *parent; 827f134585aSTrond Myklebust struct inode *dir; 8285d67476fSTrond Myklebust int error = 0; 8291da177e4SLinus Torvalds 8305d67476fSTrond Myklebust parent = dget_parent(dentry); 8315d67476fSTrond Myklebust dir = parent->d_inode; 832c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 833810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8341b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8355d67476fSTrond Myklebust dput(parent); 836f134585aSTrond Myklebust return error; 8371da177e4SLinus Torvalds } 838468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8391da177e4SLinus Torvalds 840e57aed77STrond Myklebust enum { 841e57aed77STrond Myklebust RPCAUTH_info, 842e57aed77STrond Myklebust RPCAUTH_EOF 843e57aed77STrond Myklebust }; 844e57aed77STrond Myklebust 845e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 846e57aed77STrond Myklebust [RPCAUTH_info] = { 847e57aed77STrond Myklebust .name = "info", 848e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 849e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 850e57aed77STrond Myklebust }, 851e57aed77STrond Myklebust }; 852e57aed77STrond Myklebust 853e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 854e57aed77STrond Myklebust { 855e57aed77STrond Myklebust return rpc_populate(dentry, 856e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 857e57aed77STrond Myklebust private); 858e57aed77STrond Myklebust } 859e57aed77STrond Myklebust 860e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 861e57aed77STrond Myklebust { 862e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 863e57aed77STrond Myklebust } 864e57aed77STrond Myklebust 8657d59d1e8STrond Myklebust /** 8667d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 8674111d4fdSRandy Dunlap * @dentry: dentry from the rpc_pipefs root to the new directory 8684111d4fdSRandy Dunlap * @name: &struct qstr for the name 8697d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 8707d59d1e8STrond Myklebust * 8717d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 8727d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 8737d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 8747d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 8757d59d1e8STrond Myklebust */ 87623ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 87723ac6581STrond Myklebust struct qstr *name, 8787d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 8797d59d1e8STrond Myklebust { 880e57aed77STrond Myklebust return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 881e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 882e57aed77STrond Myklebust } 883e57aed77STrond Myklebust 884e57aed77STrond Myklebust /** 885e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 886e57aed77STrond Myklebust * @dentry: directory to remove 887e57aed77STrond Myklebust */ 888e57aed77STrond Myklebust int rpc_remove_client_dir(struct dentry *dentry) 889e57aed77STrond Myklebust { 890e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 8917d59d1e8STrond Myklebust } 8927d59d1e8STrond Myklebust 8938854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 8948854e82dSTrond Myklebust [0] = { 8958854e82dSTrond Myklebust .name = "channel", 8968854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 89796c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 8988854e82dSTrond Myklebust }, 8998854e82dSTrond Myklebust [1] = { 9008854e82dSTrond Myklebust .name = "content", 9018854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 9028854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 9038854e82dSTrond Myklebust }, 9048854e82dSTrond Myklebust [2] = { 9058854e82dSTrond Myklebust .name = "flush", 9068854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 9078854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9088854e82dSTrond Myklebust }, 9098854e82dSTrond Myklebust }; 9108854e82dSTrond Myklebust 9118854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 9128854e82dSTrond Myklebust { 9138854e82dSTrond Myklebust return rpc_populate(dentry, 9148854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 9158854e82dSTrond Myklebust private); 9168854e82dSTrond Myklebust } 9178854e82dSTrond Myklebust 9188854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 9198854e82dSTrond Myklebust { 9208854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 9218854e82dSTrond Myklebust } 9228854e82dSTrond Myklebust 9238854e82dSTrond Myklebust struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, 92464f1426fSAl Viro umode_t umode, struct cache_detail *cd) 9258854e82dSTrond Myklebust { 9268854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 9278854e82dSTrond Myklebust rpc_cachedir_populate, cd); 9288854e82dSTrond Myklebust } 9298854e82dSTrond Myklebust 9308854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 9318854e82dSTrond Myklebust { 9328854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 9338854e82dSTrond Myklebust } 9348854e82dSTrond Myklebust 9351da177e4SLinus Torvalds /* 9361da177e4SLinus Torvalds * populate the filesystem 9371da177e4SLinus Torvalds */ 938b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 9391da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 9401da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 9411da177e4SLinus Torvalds .statfs = simple_statfs, 9421da177e4SLinus Torvalds }; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 9451da177e4SLinus Torvalds 946bb156749STrond Myklebust /* 947bb156749STrond Myklebust * We have a single directory with 1 node in it. 948bb156749STrond Myklebust */ 949bb156749STrond Myklebust enum { 950bb156749STrond Myklebust RPCAUTH_lockd, 951bb156749STrond Myklebust RPCAUTH_mount, 952bb156749STrond Myklebust RPCAUTH_nfs, 953bb156749STrond Myklebust RPCAUTH_portmap, 954bb156749STrond Myklebust RPCAUTH_statd, 955bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 956e571cbf1STrond Myklebust RPCAUTH_cache, 957bb156749STrond Myklebust RPCAUTH_RootEOF 958bb156749STrond Myklebust }; 959bb156749STrond Myklebust 960bb156749STrond Myklebust static const struct rpc_filelist files[] = { 961bb156749STrond Myklebust [RPCAUTH_lockd] = { 962bb156749STrond Myklebust .name = "lockd", 963bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 964bb156749STrond Myklebust }, 965bb156749STrond Myklebust [RPCAUTH_mount] = { 966bb156749STrond Myklebust .name = "mount", 967bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 968bb156749STrond Myklebust }, 969bb156749STrond Myklebust [RPCAUTH_nfs] = { 970bb156749STrond Myklebust .name = "nfs", 971bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 972bb156749STrond Myklebust }, 973bb156749STrond Myklebust [RPCAUTH_portmap] = { 974bb156749STrond Myklebust .name = "portmap", 975bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 976bb156749STrond Myklebust }, 977bb156749STrond Myklebust [RPCAUTH_statd] = { 978bb156749STrond Myklebust .name = "statd", 979bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 980bb156749STrond Myklebust }, 981bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 982bb156749STrond Myklebust .name = "nfsd4_cb", 983bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 984bb156749STrond Myklebust }, 985e571cbf1STrond Myklebust [RPCAUTH_cache] = { 986e571cbf1STrond Myklebust .name = "cache", 987e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 988e571cbf1STrond Myklebust }, 989bb156749STrond Myklebust }; 990bb156749STrond Myklebust 9911da177e4SLinus Torvalds static int 9921da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 9931da177e4SLinus Torvalds { 9941da177e4SLinus Torvalds struct inode *inode; 9951da177e4SLinus Torvalds struct dentry *root; 99638b0da75SStanislav Kinsbursky struct net *net = data; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 9991da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 10001da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 10011da177e4SLinus Torvalds sb->s_op = &s_ops; 10021da177e4SLinus Torvalds sb->s_time_gran = 1; 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 10051da177e4SLinus Torvalds if (!inode) 10061da177e4SLinus Torvalds return -ENOMEM; 1007fc7bed8cSAl Viro sb->s_root = root = d_alloc_root(inode); 10081da177e4SLinus Torvalds if (!root) { 10091da177e4SLinus Torvalds iput(inode); 10101da177e4SLinus Torvalds return -ENOMEM; 10111da177e4SLinus Torvalds } 1012ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 10131da177e4SLinus Torvalds return -ENOMEM; 1014fc7bed8cSAl Viro return 0; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 1017fc14f2feSAl Viro static struct dentry * 1018fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1019fc14f2feSAl Viro int flags, const char *dev_name, void *data) 10201da177e4SLinus Torvalds { 102138b0da75SStanislav Kinsbursky return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 10251da177e4SLinus Torvalds .owner = THIS_MODULE, 10261da177e4SLinus Torvalds .name = "rpc_pipefs", 1027fc14f2feSAl Viro .mount = rpc_mount, 10281da177e4SLinus Torvalds .kill_sb = kill_litter_super, 10291da177e4SLinus Torvalds }; 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds static void 103251cc5068SAlexey Dobriyan init_once(void *foo) 10331da177e4SLinus Torvalds { 10341da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 10371da177e4SLinus Torvalds rpci->private = NULL; 10381da177e4SLinus Torvalds rpci->nreaders = 0; 10391da177e4SLinus Torvalds rpci->nwriters = 0; 10401da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->in_upcall); 10416e84c7b6STrond Myklebust INIT_LIST_HEAD(&rpci->in_downcall); 10421da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->pipe); 10431da177e4SLinus Torvalds rpci->pipelen = 0; 10441da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 104552bad64dSDavid Howells INIT_DELAYED_WORK(&rpci->queue_timeout, 104665f27f38SDavid Howells rpc_timeout_upcall_queue); 10471da177e4SLinus Torvalds rpci->ops = NULL; 10481da177e4SLinus Torvalds } 10491da177e4SLinus Torvalds 10501da177e4SLinus Torvalds int register_rpc_pipefs(void) 10511da177e4SLinus Torvalds { 10525bd5f581SAkinobu Mita int err; 10535bd5f581SAkinobu Mita 10541da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 10551da177e4SLinus Torvalds sizeof(struct rpc_inode), 1056fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1057fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 105820c2df83SPaul Mundt init_once); 10591da177e4SLinus Torvalds if (!rpc_inode_cachep) 10601da177e4SLinus Torvalds return -ENOMEM; 10615bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 10625bd5f581SAkinobu Mita if (err) { 10635bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 10645bd5f581SAkinobu Mita return err; 10655bd5f581SAkinobu Mita } 10665bd5f581SAkinobu Mita 10671da177e4SLinus Torvalds return 0; 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 10711da177e4SLinus Torvalds { 10721a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 10731da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 10741da177e4SLinus Torvalds } 1075dcbf8c30SMichal Schmidt 1076dcbf8c30SMichal Schmidt /* Make 'mount -t rpc_pipefs ...' autoload this module. */ 1077dcbf8c30SMichal Schmidt MODULE_ALIAS("rpc_pipefs"); 1078