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/config.h> 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/slab.h> 141da177e4SLinus Torvalds #include <linux/string.h> 151da177e4SLinus Torvalds #include <linux/pagemap.h> 161da177e4SLinus Torvalds #include <linux/mount.h> 171da177e4SLinus Torvalds #include <linux/namei.h> 181da177e4SLinus Torvalds #include <linux/dnotify.h> 191da177e4SLinus Torvalds #include <linux/kernel.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/ioctls.h> 221da177e4SLinus Torvalds #include <linux/fs.h> 231da177e4SLinus Torvalds #include <linux/poll.h> 241da177e4SLinus Torvalds #include <linux/wait.h> 251da177e4SLinus Torvalds #include <linux/seq_file.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 281da177e4SLinus Torvalds #include <linux/workqueue.h> 291da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 301da177e4SLinus Torvalds 31ba89966cSEric Dumazet static struct vfsmount *rpc_mount __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 37ba89966cSEric Dumazet static kmem_cache_t *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); 509842ef35STrond Myklebust list_del(&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 581da177e4SLinus Torvalds rpc_timeout_upcall_queue(void *data) 591da177e4SLinus Torvalds { 609842ef35STrond Myklebust LIST_HEAD(free_list); 611da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *)data; 621da177e4SLinus Torvalds struct inode *inode = &rpci->vfs_inode; 639842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 641da177e4SLinus Torvalds 659842ef35STrond Myklebust spin_lock(&inode->i_lock); 669842ef35STrond Myklebust if (rpci->ops == NULL) { 679842ef35STrond Myklebust spin_unlock(&inode->i_lock); 689842ef35STrond Myklebust return; 699842ef35STrond Myklebust } 709842ef35STrond Myklebust destroy_msg = rpci->ops->destroy_msg; 719842ef35STrond Myklebust if (rpci->nreaders == 0) { 729842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 739842ef35STrond Myklebust rpci->pipelen = 0; 749842ef35STrond Myklebust } 759842ef35STrond Myklebust spin_unlock(&inode->i_lock); 769842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds int 801da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 836070fe6fSTrond Myklebust int res = -EPIPE; 841da177e4SLinus Torvalds 859842ef35STrond Myklebust spin_lock(&inode->i_lock); 866070fe6fSTrond Myklebust if (rpci->ops == NULL) 876070fe6fSTrond Myklebust goto out; 881da177e4SLinus Torvalds if (rpci->nreaders) { 891da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 901da177e4SLinus Torvalds rpci->pipelen += msg->len; 916070fe6fSTrond Myklebust res = 0; 921da177e4SLinus Torvalds } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { 931da177e4SLinus Torvalds if (list_empty(&rpci->pipe)) 9424c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 9524c5d9d7STrond Myklebust &rpci->queue_timeout, 961da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 971da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 981da177e4SLinus Torvalds rpci->pipelen += msg->len; 996070fe6fSTrond Myklebust res = 0; 1006070fe6fSTrond Myklebust } 1016070fe6fSTrond Myklebust out: 1029842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1031da177e4SLinus Torvalds wake_up(&rpci->waitq); 1041da177e4SLinus Torvalds return res; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1076070fe6fSTrond Myklebust static inline void 1086070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1096070fe6fSTrond Myklebust { 1106070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1116070fe6fSTrond Myklebust } 1126070fe6fSTrond Myklebust 1131da177e4SLinus Torvalds static void 1141da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1151da177e4SLinus Torvalds { 1161da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1179842ef35STrond Myklebust struct rpc_pipe_ops *ops; 1181da177e4SLinus Torvalds 1191b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1209842ef35STrond Myklebust ops = rpci->ops; 1219842ef35STrond Myklebust if (ops != NULL) { 1229842ef35STrond Myklebust LIST_HEAD(free_list); 1239842ef35STrond Myklebust 1249842ef35STrond Myklebust spin_lock(&inode->i_lock); 1251da177e4SLinus Torvalds rpci->nreaders = 0; 1269842ef35STrond Myklebust list_splice_init(&rpci->in_upcall, &free_list); 1279842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 1289842ef35STrond Myklebust rpci->pipelen = 0; 1291da177e4SLinus Torvalds rpci->ops = NULL; 1309842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1319842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); 1329842ef35STrond Myklebust rpci->nwriters = 0; 1339842ef35STrond Myklebust if (ops->release_pipe) 1349842ef35STrond Myklebust ops->release_pipe(inode); 1359842ef35STrond Myklebust cancel_delayed_work(&rpci->queue_timeout); 13624c5d9d7STrond Myklebust flush_workqueue(rpciod_workqueue); 1371da177e4SLinus Torvalds } 1386070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1391b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds static struct inode * 1431da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1441da177e4SLinus Torvalds { 1451da177e4SLinus Torvalds struct rpc_inode *rpci; 1461da177e4SLinus Torvalds rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); 1471da177e4SLinus Torvalds if (!rpci) 1481da177e4SLinus Torvalds return NULL; 1491da177e4SLinus Torvalds return &rpci->vfs_inode; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds static void 1531da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds static int 1591da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 1601da177e4SLinus Torvalds { 1611da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1621da177e4SLinus Torvalds int res = -ENXIO; 1631da177e4SLinus Torvalds 1641b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1651da177e4SLinus Torvalds if (rpci->ops != NULL) { 1661da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1671da177e4SLinus Torvalds rpci->nreaders ++; 1681da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1691da177e4SLinus Torvalds rpci->nwriters ++; 1701da177e4SLinus Torvalds res = 0; 1711da177e4SLinus Torvalds } 1721b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1731da177e4SLinus Torvalds return res; 1741da177e4SLinus Torvalds } 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds static int 1771da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 1781da177e4SLinus Torvalds { 179969b7f25STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 1801da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 1811da177e4SLinus Torvalds 1821b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1831da177e4SLinus Torvalds if (rpci->ops == NULL) 1841da177e4SLinus Torvalds goto out; 1851da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 1861da177e4SLinus Torvalds if (msg != NULL) { 1879842ef35STrond Myklebust spin_lock(&inode->i_lock); 18848e49187STrond Myklebust msg->errno = -EAGAIN; 1899842ef35STrond Myklebust list_del(&msg->list); 1909842ef35STrond Myklebust spin_unlock(&inode->i_lock); 1911da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1941da177e4SLinus Torvalds rpci->nwriters --; 1959842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 1961da177e4SLinus Torvalds rpci->nreaders --; 1979842ef35STrond Myklebust if (rpci->nreaders == 0) { 1989842ef35STrond Myklebust LIST_HEAD(free_list); 1999842ef35STrond Myklebust spin_lock(&inode->i_lock); 2009842ef35STrond Myklebust list_splice_init(&rpci->pipe, &free_list); 2019842ef35STrond Myklebust rpci->pipelen = 0; 2029842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2039842ef35STrond Myklebust rpc_purge_list(rpci, &free_list, 2049842ef35STrond Myklebust rpci->ops->destroy_msg, -EAGAIN); 2059842ef35STrond Myklebust } 2069842ef35STrond Myklebust } 2071da177e4SLinus Torvalds if (rpci->ops->release_pipe) 2081da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 2091da177e4SLinus Torvalds out: 2101b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2111da177e4SLinus Torvalds return 0; 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds static ssize_t 2151da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2181da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2191da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2201da177e4SLinus Torvalds int res = 0; 2211da177e4SLinus Torvalds 2221b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2231da177e4SLinus Torvalds if (rpci->ops == NULL) { 2241da177e4SLinus Torvalds res = -EPIPE; 2251da177e4SLinus Torvalds goto out_unlock; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds msg = filp->private_data; 2281da177e4SLinus Torvalds if (msg == NULL) { 2299842ef35STrond Myklebust spin_lock(&inode->i_lock); 2301da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) { 2311da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, 2321da177e4SLinus Torvalds struct rpc_pipe_msg, 2331da177e4SLinus Torvalds list); 2341da177e4SLinus Torvalds list_move(&msg->list, &rpci->in_upcall); 2351da177e4SLinus Torvalds rpci->pipelen -= msg->len; 2361da177e4SLinus Torvalds filp->private_data = msg; 2371da177e4SLinus Torvalds msg->copied = 0; 2381da177e4SLinus Torvalds } 2399842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2401da177e4SLinus Torvalds if (msg == NULL) 2411da177e4SLinus Torvalds goto out_unlock; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 2441da177e4SLinus Torvalds res = rpci->ops->upcall(filp, msg, buf, len); 2451da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 2461da177e4SLinus Torvalds filp->private_data = NULL; 2479842ef35STrond Myklebust spin_lock(&inode->i_lock); 2489842ef35STrond Myklebust list_del(&msg->list); 2499842ef35STrond Myklebust spin_unlock(&inode->i_lock); 2501da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds out_unlock: 2531b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2541da177e4SLinus Torvalds return res; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds static ssize_t 2581da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 2591da177e4SLinus Torvalds { 2601da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2611da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2621da177e4SLinus Torvalds int res; 2631da177e4SLinus Torvalds 2641b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2651da177e4SLinus Torvalds res = -EPIPE; 2661da177e4SLinus Torvalds if (rpci->ops != NULL) 2671da177e4SLinus Torvalds res = rpci->ops->downcall(filp, buf, len); 2681b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2691da177e4SLinus Torvalds return res; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds static unsigned int 2731da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds struct rpc_inode *rpci; 2761da177e4SLinus Torvalds unsigned int mask = 0; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds rpci = RPC_I(filp->f_dentry->d_inode); 2791da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 2821da177e4SLinus Torvalds if (rpci->ops == NULL) 2831da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 2841da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) 2851da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 2861da177e4SLinus Torvalds return mask; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static int 2901da177e4SLinus Torvalds rpc_pipe_ioctl(struct inode *ino, struct file *filp, 2911da177e4SLinus Torvalds unsigned int cmd, unsigned long arg) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); 2941da177e4SLinus Torvalds int len; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds switch (cmd) { 2971da177e4SLinus Torvalds case FIONREAD: 2981da177e4SLinus Torvalds if (rpci->ops == NULL) 2991da177e4SLinus Torvalds return -EPIPE; 3001da177e4SLinus Torvalds len = rpci->pipelen; 3011da177e4SLinus Torvalds if (filp->private_data) { 3021da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 3031da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 3041da177e4SLinus Torvalds len += msg->len - msg->copied; 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3071da177e4SLinus Torvalds default: 3081da177e4SLinus Torvalds return -EINVAL; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds static struct file_operations rpc_pipe_fops = { 3131da177e4SLinus Torvalds .owner = THIS_MODULE, 3141da177e4SLinus Torvalds .llseek = no_llseek, 3151da177e4SLinus Torvalds .read = rpc_pipe_read, 3161da177e4SLinus Torvalds .write = rpc_pipe_write, 3171da177e4SLinus Torvalds .poll = rpc_pipe_poll, 3181da177e4SLinus Torvalds .ioctl = rpc_pipe_ioctl, 3191da177e4SLinus Torvalds .open = rpc_pipe_open, 3201da177e4SLinus Torvalds .release = rpc_pipe_release, 3211da177e4SLinus Torvalds }; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds static int 3241da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3291da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3301da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 3311da177e4SLinus Torvalds seq_printf(m, "address: %u.%u.%u.%u\n", 3321da177e4SLinus Torvalds NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); 3331da177e4SLinus Torvalds seq_printf(m, "protocol: %s\n", 3341da177e4SLinus Torvalds clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); 3351da177e4SLinus Torvalds return 0; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds static int 3391da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 3401da177e4SLinus Torvalds { 3411da177e4SLinus Torvalds struct rpc_clnt *clnt; 3421da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds if (!ret) { 3451da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3461b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3471da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 3481da177e4SLinus Torvalds if (clnt) { 3491da177e4SLinus Torvalds atomic_inc(&clnt->cl_users); 3501da177e4SLinus Torvalds m->private = clnt; 3511da177e4SLinus Torvalds } else { 3521da177e4SLinus Torvalds single_release(inode, file); 3531da177e4SLinus Torvalds ret = -EINVAL; 3541da177e4SLinus Torvalds } 3551b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds return ret; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds static int 3611da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 3621da177e4SLinus Torvalds { 3631da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3641da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds if (clnt) 3671da177e4SLinus Torvalds rpc_release_client(clnt); 3681da177e4SLinus Torvalds return single_release(inode, file); 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static struct file_operations rpc_info_operations = { 3721da177e4SLinus Torvalds .owner = THIS_MODULE, 3731da177e4SLinus Torvalds .open = rpc_info_open, 3741da177e4SLinus Torvalds .read = seq_read, 3751da177e4SLinus Torvalds .llseek = seq_lseek, 3761da177e4SLinus Torvalds .release = rpc_info_release, 3771da177e4SLinus Torvalds }; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* 3811da177e4SLinus Torvalds * We have a single directory with 1 node in it. 3821da177e4SLinus Torvalds */ 3831da177e4SLinus Torvalds enum { 3841da177e4SLinus Torvalds RPCAUTH_Root = 1, 3851da177e4SLinus Torvalds RPCAUTH_lockd, 3861da177e4SLinus Torvalds RPCAUTH_mount, 3871da177e4SLinus Torvalds RPCAUTH_nfs, 3881da177e4SLinus Torvalds RPCAUTH_portmap, 3891da177e4SLinus Torvalds RPCAUTH_statd, 3901da177e4SLinus Torvalds RPCAUTH_RootEOF 3911da177e4SLinus Torvalds }; 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* 3941da177e4SLinus Torvalds * Description of fs contents. 3951da177e4SLinus Torvalds */ 3961da177e4SLinus Torvalds struct rpc_filelist { 3971da177e4SLinus Torvalds char *name; 39899ac48f5SArjan van de Ven const struct file_operations *i_fop; 3991da177e4SLinus Torvalds int mode; 4001da177e4SLinus Torvalds }; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds static struct rpc_filelist files[] = { 4031da177e4SLinus Torvalds [RPCAUTH_lockd] = { 4041da177e4SLinus Torvalds .name = "lockd", 4051da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4061da177e4SLinus Torvalds }, 4071da177e4SLinus Torvalds [RPCAUTH_mount] = { 4081da177e4SLinus Torvalds .name = "mount", 4091da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4101da177e4SLinus Torvalds }, 4111da177e4SLinus Torvalds [RPCAUTH_nfs] = { 4121da177e4SLinus Torvalds .name = "nfs", 4131da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4141da177e4SLinus Torvalds }, 4151da177e4SLinus Torvalds [RPCAUTH_portmap] = { 4161da177e4SLinus Torvalds .name = "portmap", 4171da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4181da177e4SLinus Torvalds }, 4191da177e4SLinus Torvalds [RPCAUTH_statd] = { 4201da177e4SLinus Torvalds .name = "statd", 4211da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4221da177e4SLinus Torvalds }, 4231da177e4SLinus Torvalds }; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds enum { 4261da177e4SLinus Torvalds RPCAUTH_info = 2, 4271da177e4SLinus Torvalds RPCAUTH_EOF 4281da177e4SLinus Torvalds }; 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds static struct rpc_filelist authfiles[] = { 4311da177e4SLinus Torvalds [RPCAUTH_info] = { 4321da177e4SLinus Torvalds .name = "info", 4331da177e4SLinus Torvalds .i_fop = &rpc_info_operations, 4341da177e4SLinus Torvalds .mode = S_IFREG | S_IRUSR, 4351da177e4SLinus Torvalds }, 4361da177e4SLinus Torvalds }; 4371da177e4SLinus Torvalds 43854281548STrond Myklebust struct vfsmount *rpc_get_mount(void) 4391da177e4SLinus Torvalds { 44054281548STrond Myklebust int err; 44154281548STrond Myklebust 44254281548STrond Myklebust err = simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); 44354281548STrond Myklebust if (err != 0) 44454281548STrond Myklebust return ERR_PTR(err); 44554281548STrond Myklebust return rpc_mount; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 44854281548STrond Myklebust void rpc_put_mount(void) 4491da177e4SLinus Torvalds { 4501da177e4SLinus Torvalds simple_release_fs(&rpc_mount, &rpc_mount_count); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 453f134585aSTrond Myklebust static int 454f134585aSTrond Myklebust rpc_lookup_parent(char *path, struct nameidata *nd) 455f134585aSTrond Myklebust { 456f134585aSTrond Myklebust if (path[0] == '\0') 457f134585aSTrond Myklebust return -ENOENT; 45854281548STrond Myklebust nd->mnt = rpc_get_mount(); 45954281548STrond Myklebust if (IS_ERR(nd->mnt)) { 460f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to mount " 461f134585aSTrond Myklebust "pseudofilesystem \n", __FILE__, __FUNCTION__); 46254281548STrond Myklebust return PTR_ERR(nd->mnt); 463f134585aSTrond Myklebust } 46454281548STrond Myklebust mntget(nd->mnt); 465f134585aSTrond Myklebust nd->dentry = dget(rpc_mount->mnt_root); 466f134585aSTrond Myklebust nd->last_type = LAST_ROOT; 467f134585aSTrond Myklebust nd->flags = LOOKUP_PARENT; 468f134585aSTrond Myklebust nd->depth = 0; 469f134585aSTrond Myklebust 470f134585aSTrond Myklebust if (path_walk(path, nd)) { 471f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to find path %s\n", 472f134585aSTrond Myklebust __FILE__, __FUNCTION__, path); 473f134585aSTrond Myklebust rpc_put_mount(); 474f134585aSTrond Myklebust return -ENOENT; 475f134585aSTrond Myklebust } 476f134585aSTrond Myklebust return 0; 477f134585aSTrond Myklebust } 478f134585aSTrond Myklebust 479f134585aSTrond Myklebust static void 480f134585aSTrond Myklebust rpc_release_path(struct nameidata *nd) 481f134585aSTrond Myklebust { 482f134585aSTrond Myklebust path_release(nd); 483f134585aSTrond Myklebust rpc_put_mount(); 484f134585aSTrond Myklebust } 485f134585aSTrond Myklebust 4861da177e4SLinus Torvalds static struct inode * 4871da177e4SLinus Torvalds rpc_get_inode(struct super_block *sb, int mode) 4881da177e4SLinus Torvalds { 4891da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4901da177e4SLinus Torvalds if (!inode) 4911da177e4SLinus Torvalds return NULL; 4921da177e4SLinus Torvalds inode->i_mode = mode; 4931da177e4SLinus Torvalds inode->i_uid = inode->i_gid = 0; 4941da177e4SLinus Torvalds inode->i_blksize = PAGE_CACHE_SIZE; 4951da177e4SLinus Torvalds inode->i_blocks = 0; 4961da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4971da177e4SLinus Torvalds switch(mode & S_IFMT) { 4981da177e4SLinus Torvalds case S_IFDIR: 4991da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 5001da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 5011da177e4SLinus Torvalds inode->i_nlink++; 5021da177e4SLinus Torvalds default: 5031da177e4SLinus Torvalds break; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds return inode; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds /* 5091da177e4SLinus Torvalds * FIXME: This probably has races. 5101da177e4SLinus Torvalds */ 5111da177e4SLinus Torvalds static void 5121da177e4SLinus Torvalds rpc_depopulate(struct dentry *parent) 5131da177e4SLinus Torvalds { 5141da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 5151da177e4SLinus Torvalds struct list_head *pos, *next; 5161da177e4SLinus Torvalds struct dentry *dentry, *dvec[10]; 5171da177e4SLinus Torvalds int n = 0; 5181da177e4SLinus Torvalds 5191b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 5201da177e4SLinus Torvalds repeat: 5211da177e4SLinus Torvalds spin_lock(&dcache_lock); 5221da177e4SLinus Torvalds list_for_each_safe(pos, next, &parent->d_subdirs) { 5235160ee6fSEric Dumazet dentry = list_entry(pos, struct dentry, d_u.d_child); 5241da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 5251da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 5261da177e4SLinus Torvalds dget_locked(dentry); 5271da177e4SLinus Torvalds __d_drop(dentry); 5281da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 5291da177e4SLinus Torvalds dvec[n++] = dentry; 5301da177e4SLinus Torvalds if (n == ARRAY_SIZE(dvec)) 5311da177e4SLinus Torvalds break; 5321da177e4SLinus Torvalds } else 5331da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds spin_unlock(&dcache_lock); 5361da177e4SLinus Torvalds if (n) { 5371da177e4SLinus Torvalds do { 5381da177e4SLinus Torvalds dentry = dvec[--n]; 5391da177e4SLinus Torvalds if (dentry->d_inode) { 5401da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 5411da177e4SLinus Torvalds simple_unlink(dir, dentry); 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds dput(dentry); 5441da177e4SLinus Torvalds } while (n); 5451da177e4SLinus Torvalds goto repeat; 5461da177e4SLinus Torvalds } 5471b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds static int 5511da177e4SLinus Torvalds rpc_populate(struct dentry *parent, 5521da177e4SLinus Torvalds struct rpc_filelist *files, 5531da177e4SLinus Torvalds int start, int eof) 5541da177e4SLinus Torvalds { 5551da177e4SLinus Torvalds struct inode *inode, *dir = parent->d_inode; 5561da177e4SLinus Torvalds void *private = RPC_I(dir)->private; 5571da177e4SLinus Torvalds struct dentry *dentry; 5581da177e4SLinus Torvalds int mode, i; 5591da177e4SLinus Torvalds 5601b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 5611da177e4SLinus Torvalds for (i = start; i < eof; i++) { 5621da177e4SLinus Torvalds dentry = d_alloc_name(parent, files[i].name); 5631da177e4SLinus Torvalds if (!dentry) 5641da177e4SLinus Torvalds goto out_bad; 5651da177e4SLinus Torvalds mode = files[i].mode; 5661da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, mode); 5671da177e4SLinus Torvalds if (!inode) { 5681da177e4SLinus Torvalds dput(dentry); 5691da177e4SLinus Torvalds goto out_bad; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds inode->i_ino = i; 5721da177e4SLinus Torvalds if (files[i].i_fop) 5731da177e4SLinus Torvalds inode->i_fop = files[i].i_fop; 5741da177e4SLinus Torvalds if (private) 5751da177e4SLinus Torvalds rpc_inode_setowner(inode, private); 5761da177e4SLinus Torvalds if (S_ISDIR(mode)) 5771da177e4SLinus Torvalds dir->i_nlink++; 5781da177e4SLinus Torvalds d_add(dentry, inode); 5791da177e4SLinus Torvalds } 5801b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5811da177e4SLinus Torvalds return 0; 5821da177e4SLinus Torvalds out_bad: 5831b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5841da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 5851da177e4SLinus Torvalds __FILE__, __FUNCTION__, parent->d_name.name); 5861da177e4SLinus Torvalds return -ENOMEM; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 589f134585aSTrond Myklebust static int 590f134585aSTrond Myklebust __rpc_mkdir(struct inode *dir, struct dentry *dentry) 5911da177e4SLinus Torvalds { 5921da177e4SLinus Torvalds struct inode *inode; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); 5951da177e4SLinus Torvalds if (!inode) 596f134585aSTrond Myklebust goto out_err; 5971da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 598278c995cSChristoph Hellwig d_instantiate(dentry, inode); 599f134585aSTrond Myklebust dir->i_nlink++; 600278c995cSChristoph Hellwig inode_dir_notify(dir, DN_CREATE); 601f134585aSTrond Myklebust return 0; 602f134585aSTrond Myklebust out_err: 603f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 604f134585aSTrond Myklebust __FILE__, __FUNCTION__, dentry->d_name.name); 605f134585aSTrond Myklebust return -ENOMEM; 606278c995cSChristoph Hellwig } 607278c995cSChristoph Hellwig 608f134585aSTrond Myklebust static int 609f134585aSTrond Myklebust __rpc_rmdir(struct inode *dir, struct dentry *dentry) 610278c995cSChristoph Hellwig { 611f134585aSTrond Myklebust int error; 612278c995cSChristoph Hellwig 613f134585aSTrond Myklebust shrink_dcache_parent(dentry); 6146070fe6fSTrond Myklebust if (dentry->d_inode) 615278c995cSChristoph Hellwig rpc_close_pipes(dentry->d_inode); 616f134585aSTrond Myklebust if ((error = simple_rmdir(dir, dentry)) != 0) 617f134585aSTrond Myklebust return error; 618f134585aSTrond Myklebust if (!error) { 619f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 620f134585aSTrond Myklebust d_drop(dentry); 6211da177e4SLinus Torvalds } 622f134585aSTrond Myklebust return 0; 623f134585aSTrond Myklebust } 624f134585aSTrond Myklebust 625f134585aSTrond Myklebust static struct dentry * 626f134585aSTrond Myklebust rpc_lookup_negative(char *path, struct nameidata *nd) 627f134585aSTrond Myklebust { 628f134585aSTrond Myklebust struct dentry *dentry; 629f134585aSTrond Myklebust struct inode *dir; 630f134585aSTrond Myklebust int error; 631f134585aSTrond Myklebust 632f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, nd)) != 0) 633f134585aSTrond Myklebust return ERR_PTR(error); 634f134585aSTrond Myklebust dir = nd->dentry->d_inode; 6351b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 636adb12f63STrond Myklebust dentry = lookup_one_len(nd->last.name, nd->dentry, nd->last.len); 637f134585aSTrond Myklebust if (IS_ERR(dentry)) 638f134585aSTrond Myklebust goto out_err; 639f134585aSTrond Myklebust if (dentry->d_inode) { 640f134585aSTrond Myklebust dput(dentry); 641f134585aSTrond Myklebust dentry = ERR_PTR(-EEXIST); 642f134585aSTrond Myklebust goto out_err; 643f134585aSTrond Myklebust } 644f134585aSTrond Myklebust return dentry; 645f134585aSTrond Myklebust out_err: 6461b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 647f134585aSTrond Myklebust rpc_release_path(nd); 648f134585aSTrond Myklebust return dentry; 649f134585aSTrond Myklebust } 650f134585aSTrond Myklebust 651f134585aSTrond Myklebust 652f134585aSTrond Myklebust struct dentry * 653f134585aSTrond Myklebust rpc_mkdir(char *path, struct rpc_clnt *rpc_client) 654f134585aSTrond Myklebust { 655f134585aSTrond Myklebust struct nameidata nd; 656f134585aSTrond Myklebust struct dentry *dentry; 657f134585aSTrond Myklebust struct inode *dir; 658f134585aSTrond Myklebust int error; 659f134585aSTrond Myklebust 660f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 661f134585aSTrond Myklebust if (IS_ERR(dentry)) 662f134585aSTrond Myklebust return dentry; 663f134585aSTrond Myklebust dir = nd.dentry->d_inode; 664f134585aSTrond Myklebust if ((error = __rpc_mkdir(dir, dentry)) != 0) 665f134585aSTrond Myklebust goto err_dput; 666f134585aSTrond Myklebust RPC_I(dentry->d_inode)->private = rpc_client; 667f134585aSTrond Myklebust error = rpc_populate(dentry, authfiles, 668f134585aSTrond Myklebust RPCAUTH_info, RPCAUTH_EOF); 669f134585aSTrond Myklebust if (error) 670f134585aSTrond Myklebust goto err_depopulate; 671f134585aSTrond Myklebust out: 6721b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 673f134585aSTrond Myklebust rpc_release_path(&nd); 67412de3b35STrond Myklebust return dget(dentry); 675f134585aSTrond Myklebust err_depopulate: 676f134585aSTrond Myklebust rpc_depopulate(dentry); 677f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 678f134585aSTrond Myklebust err_dput: 679f134585aSTrond Myklebust dput(dentry); 680f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", 681f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, error); 682f134585aSTrond Myklebust dentry = ERR_PTR(error); 683f134585aSTrond Myklebust goto out; 684f134585aSTrond Myklebust } 685f134585aSTrond Myklebust 686f134585aSTrond Myklebust int 687f134585aSTrond Myklebust rpc_rmdir(char *path) 688f134585aSTrond Myklebust { 689f134585aSTrond Myklebust struct nameidata nd; 690f134585aSTrond Myklebust struct dentry *dentry; 691f134585aSTrond Myklebust struct inode *dir; 692f134585aSTrond Myklebust int error; 693f134585aSTrond Myklebust 694f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 695f134585aSTrond Myklebust return error; 696f134585aSTrond Myklebust dir = nd.dentry->d_inode; 6971b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 698adb12f63STrond Myklebust dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); 699f134585aSTrond Myklebust if (IS_ERR(dentry)) { 700f134585aSTrond Myklebust error = PTR_ERR(dentry); 701f134585aSTrond Myklebust goto out_release; 702f134585aSTrond Myklebust } 703f134585aSTrond Myklebust rpc_depopulate(dentry); 704f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 705f134585aSTrond Myklebust dput(dentry); 706f134585aSTrond Myklebust out_release: 7071b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 708f134585aSTrond Myklebust rpc_release_path(&nd); 709f134585aSTrond Myklebust return error; 710f134585aSTrond Myklebust } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds struct dentry * 713f134585aSTrond Myklebust rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) 7141da177e4SLinus Torvalds { 715f134585aSTrond Myklebust struct nameidata nd; 7161da177e4SLinus Torvalds struct dentry *dentry; 717f134585aSTrond Myklebust struct inode *dir, *inode; 7181da177e4SLinus Torvalds struct rpc_inode *rpci; 7191da177e4SLinus Torvalds 720f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 7211da177e4SLinus Torvalds if (IS_ERR(dentry)) 722f134585aSTrond Myklebust return dentry; 723f134585aSTrond Myklebust dir = nd.dentry->d_inode; 724f134585aSTrond Myklebust inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); 725f134585aSTrond Myklebust if (!inode) 726f134585aSTrond Myklebust goto err_dput; 7271da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 7281da177e4SLinus Torvalds inode->i_fop = &rpc_pipe_fops; 729f134585aSTrond Myklebust d_instantiate(dentry, inode); 7301da177e4SLinus Torvalds rpci = RPC_I(inode); 7311da177e4SLinus Torvalds rpci->private = private; 7321da177e4SLinus Torvalds rpci->flags = flags; 7331da177e4SLinus Torvalds rpci->ops = ops; 7341da177e4SLinus Torvalds inode_dir_notify(dir, DN_CREATE); 735f134585aSTrond Myklebust out: 7361b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 737f134585aSTrond Myklebust rpc_release_path(&nd); 73812de3b35STrond Myklebust return dget(dentry); 739f134585aSTrond Myklebust err_dput: 7401da177e4SLinus Torvalds dput(dentry); 741f134585aSTrond Myklebust dentry = ERR_PTR(-ENOMEM); 742f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", 743f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, -ENOMEM); 744f134585aSTrond Myklebust goto out; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 747f134585aSTrond Myklebust int 748f134585aSTrond Myklebust rpc_unlink(char *path) 7491da177e4SLinus Torvalds { 750f134585aSTrond Myklebust struct nameidata nd; 751f134585aSTrond Myklebust struct dentry *dentry; 752f134585aSTrond Myklebust struct inode *dir; 753f134585aSTrond Myklebust int error; 7541da177e4SLinus Torvalds 755f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 756f134585aSTrond Myklebust return error; 757f134585aSTrond Myklebust dir = nd.dentry->d_inode; 7581b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 759adb12f63STrond Myklebust dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); 760f134585aSTrond Myklebust if (IS_ERR(dentry)) { 761f134585aSTrond Myklebust error = PTR_ERR(dentry); 762f134585aSTrond Myklebust goto out_release; 763f134585aSTrond Myklebust } 764f134585aSTrond Myklebust d_drop(dentry); 7651da177e4SLinus Torvalds if (dentry->d_inode) { 7661da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 767f134585aSTrond Myklebust error = simple_unlink(dir, dentry); 7681da177e4SLinus Torvalds } 769f134585aSTrond Myklebust dput(dentry); 770f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 771f134585aSTrond Myklebust out_release: 7721b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 773f134585aSTrond Myklebust rpc_release_path(&nd); 774f134585aSTrond Myklebust return error; 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * populate the filesystem 7791da177e4SLinus Torvalds */ 7801da177e4SLinus Torvalds static struct super_operations s_ops = { 7811da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 7821da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 7831da177e4SLinus Torvalds .statfs = simple_statfs, 7841da177e4SLinus Torvalds }; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds static int 7891da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 7901da177e4SLinus Torvalds { 7911da177e4SLinus Torvalds struct inode *inode; 7921da177e4SLinus Torvalds struct dentry *root; 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 7951da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 7961da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 7971da177e4SLinus Torvalds sb->s_op = &s_ops; 7981da177e4SLinus Torvalds sb->s_time_gran = 1; 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 8011da177e4SLinus Torvalds if (!inode) 8021da177e4SLinus Torvalds return -ENOMEM; 8031da177e4SLinus Torvalds root = d_alloc_root(inode); 8041da177e4SLinus Torvalds if (!root) { 8051da177e4SLinus Torvalds iput(inode); 8061da177e4SLinus Torvalds return -ENOMEM; 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) 8091da177e4SLinus Torvalds goto out; 8101da177e4SLinus Torvalds sb->s_root = root; 8111da177e4SLinus Torvalds return 0; 8121da177e4SLinus Torvalds out: 8131da177e4SLinus Torvalds d_genocide(root); 8141da177e4SLinus Torvalds dput(root); 8151da177e4SLinus Torvalds return -ENOMEM; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds static struct super_block * 8191da177e4SLinus Torvalds rpc_get_sb(struct file_system_type *fs_type, 8201da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 8211da177e4SLinus Torvalds { 8221da177e4SLinus Torvalds return get_sb_single(fs_type, flags, data, rpc_fill_super); 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 8261da177e4SLinus Torvalds .owner = THIS_MODULE, 8271da177e4SLinus Torvalds .name = "rpc_pipefs", 8281da177e4SLinus Torvalds .get_sb = rpc_get_sb, 8291da177e4SLinus Torvalds .kill_sb = kill_litter_super, 8301da177e4SLinus Torvalds }; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds static void 8331da177e4SLinus Torvalds init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 8341da177e4SLinus Torvalds { 8351da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 8381da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) { 8391da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 8401da177e4SLinus Torvalds rpci->private = NULL; 8411da177e4SLinus Torvalds rpci->nreaders = 0; 8421da177e4SLinus Torvalds rpci->nwriters = 0; 8431da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->in_upcall); 8441da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->pipe); 8451da177e4SLinus Torvalds rpci->pipelen = 0; 8461da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 8471da177e4SLinus Torvalds INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); 8481da177e4SLinus Torvalds rpci->ops = NULL; 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds int register_rpc_pipefs(void) 8531da177e4SLinus Torvalds { 8541da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 8551da177e4SLinus Torvalds sizeof(struct rpc_inode), 856fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 857fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 8581da177e4SLinus Torvalds init_once, NULL); 8591da177e4SLinus Torvalds if (!rpc_inode_cachep) 8601da177e4SLinus Torvalds return -ENOMEM; 8611da177e4SLinus Torvalds register_filesystem(&rpc_pipe_fs_type); 8621da177e4SLinus Torvalds return 0; 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 8661da177e4SLinus Torvalds { 8671da177e4SLinus Torvalds if (kmem_cache_destroy(rpc_inode_cachep)) 8681da177e4SLinus Torvalds printk(KERN_WARNING "RPC: unable to free inode cache\n"); 8691da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 8701da177e4SLinus Torvalds } 871