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 411da177e4SLinus Torvalds static void 42b3eb67a2STrond Myklebust __rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, int err) 43b3eb67a2STrond Myklebust { 44b3eb67a2STrond Myklebust struct rpc_pipe_msg *msg; 45b3eb67a2STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 46b3eb67a2STrond Myklebust 47b3eb67a2STrond Myklebust destroy_msg = rpci->ops->destroy_msg; 48b3eb67a2STrond Myklebust while (!list_empty(head)) { 49b3eb67a2STrond Myklebust msg = list_entry(head->next, struct rpc_pipe_msg, list); 50b3eb67a2STrond Myklebust list_del_init(&msg->list); 51b3eb67a2STrond Myklebust msg->errno = err; 52b3eb67a2STrond Myklebust destroy_msg(msg); 53b3eb67a2STrond Myklebust } 54b3eb67a2STrond Myklebust } 55b3eb67a2STrond Myklebust 56b3eb67a2STrond Myklebust static void 571da177e4SLinus Torvalds __rpc_purge_upcall(struct inode *inode, int err) 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 601da177e4SLinus Torvalds 61b3eb67a2STrond Myklebust __rpc_purge_list(rpci, &rpci->pipe, err); 621da177e4SLinus Torvalds rpci->pipelen = 0; 631da177e4SLinus Torvalds wake_up(&rpci->waitq); 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds static void 671da177e4SLinus Torvalds rpc_timeout_upcall_queue(void *data) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *)data; 701da177e4SLinus Torvalds struct inode *inode = &rpci->vfs_inode; 711da177e4SLinus Torvalds 721b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 73969b7f25STrond Myklebust if (rpci->ops == NULL) 74969b7f25STrond Myklebust goto out; 751da177e4SLinus Torvalds if (rpci->nreaders == 0 && !list_empty(&rpci->pipe)) 761da177e4SLinus Torvalds __rpc_purge_upcall(inode, -ETIMEDOUT); 77969b7f25STrond Myklebust out: 781b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds int 821da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 856070fe6fSTrond Myklebust int res = -EPIPE; 861da177e4SLinus Torvalds 871b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 886070fe6fSTrond Myklebust if (rpci->ops == NULL) 896070fe6fSTrond Myklebust goto out; 901da177e4SLinus Torvalds if (rpci->nreaders) { 911da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 921da177e4SLinus Torvalds rpci->pipelen += msg->len; 936070fe6fSTrond Myklebust res = 0; 941da177e4SLinus Torvalds } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { 951da177e4SLinus Torvalds if (list_empty(&rpci->pipe)) 961da177e4SLinus Torvalds schedule_delayed_work(&rpci->queue_timeout, 971da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 981da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 991da177e4SLinus Torvalds rpci->pipelen += msg->len; 1006070fe6fSTrond Myklebust res = 0; 1016070fe6fSTrond Myklebust } 1026070fe6fSTrond Myklebust out: 1031b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1041da177e4SLinus Torvalds wake_up(&rpci->waitq); 1051da177e4SLinus Torvalds return res; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1086070fe6fSTrond Myklebust static inline void 1096070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1106070fe6fSTrond Myklebust { 1116070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1126070fe6fSTrond Myklebust } 1136070fe6fSTrond Myklebust 1141da177e4SLinus Torvalds static void 1151da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1181da177e4SLinus Torvalds 1191b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1201da177e4SLinus Torvalds if (rpci->ops != NULL) { 1211da177e4SLinus Torvalds rpci->nreaders = 0; 122bb184f33STrond Myklebust __rpc_purge_list(rpci, &rpci->in_upcall, -EPIPE); 1231da177e4SLinus Torvalds __rpc_purge_upcall(inode, -EPIPE); 1241da177e4SLinus Torvalds rpci->nwriters = 0; 1251da177e4SLinus Torvalds if (rpci->ops->release_pipe) 1261da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 1271da177e4SLinus Torvalds rpci->ops = NULL; 1281da177e4SLinus Torvalds } 1296070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1301b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 131969b7f25STrond Myklebust cancel_delayed_work(&rpci->queue_timeout); 132969b7f25STrond Myklebust flush_scheduled_work(); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds static struct inode * 1361da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1371da177e4SLinus Torvalds { 1381da177e4SLinus Torvalds struct rpc_inode *rpci; 1391da177e4SLinus Torvalds rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); 1401da177e4SLinus Torvalds if (!rpci) 1411da177e4SLinus Torvalds return NULL; 1421da177e4SLinus Torvalds return &rpci->vfs_inode; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds static void 1461da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds static int 1521da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1551da177e4SLinus Torvalds int res = -ENXIO; 1561da177e4SLinus Torvalds 1571b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1581da177e4SLinus Torvalds if (rpci->ops != NULL) { 1591da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1601da177e4SLinus Torvalds rpci->nreaders ++; 1611da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1621da177e4SLinus Torvalds rpci->nwriters ++; 1631da177e4SLinus Torvalds res = 0; 1641da177e4SLinus Torvalds } 1651b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1661da177e4SLinus Torvalds return res; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static int 1701da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 1711da177e4SLinus Torvalds { 172969b7f25STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 1731da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 1741da177e4SLinus Torvalds 1751b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1761da177e4SLinus Torvalds if (rpci->ops == NULL) 1771da177e4SLinus Torvalds goto out; 1781da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 1791da177e4SLinus Torvalds if (msg != NULL) { 18048e49187STrond Myklebust msg->errno = -EAGAIN; 1811da177e4SLinus Torvalds list_del_init(&msg->list); 1821da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1851da177e4SLinus Torvalds rpci->nwriters --; 1861da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1871da177e4SLinus Torvalds rpci->nreaders --; 1881da177e4SLinus Torvalds if (!rpci->nreaders) 18948e49187STrond Myklebust __rpc_purge_upcall(inode, -EAGAIN); 1901da177e4SLinus Torvalds if (rpci->ops->release_pipe) 1911da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 1921da177e4SLinus Torvalds out: 1931b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1941da177e4SLinus Torvalds return 0; 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds static ssize_t 1981da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2011da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2021da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2031da177e4SLinus Torvalds int res = 0; 2041da177e4SLinus Torvalds 2051b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2061da177e4SLinus Torvalds if (rpci->ops == NULL) { 2071da177e4SLinus Torvalds res = -EPIPE; 2081da177e4SLinus Torvalds goto out_unlock; 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds msg = filp->private_data; 2111da177e4SLinus Torvalds if (msg == NULL) { 2121da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) { 2131da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, 2141da177e4SLinus Torvalds struct rpc_pipe_msg, 2151da177e4SLinus Torvalds list); 2161da177e4SLinus Torvalds list_move(&msg->list, &rpci->in_upcall); 2171da177e4SLinus Torvalds rpci->pipelen -= msg->len; 2181da177e4SLinus Torvalds filp->private_data = msg; 2191da177e4SLinus Torvalds msg->copied = 0; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds if (msg == NULL) 2221da177e4SLinus Torvalds goto out_unlock; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 2251da177e4SLinus Torvalds res = rpci->ops->upcall(filp, msg, buf, len); 2261da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 2271da177e4SLinus Torvalds filp->private_data = NULL; 2281da177e4SLinus Torvalds list_del_init(&msg->list); 2291da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds out_unlock: 2321b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2331da177e4SLinus Torvalds return res; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds static ssize_t 2371da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2401da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2411da177e4SLinus Torvalds int res; 2421da177e4SLinus Torvalds 2431b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2441da177e4SLinus Torvalds res = -EPIPE; 2451da177e4SLinus Torvalds if (rpci->ops != NULL) 2461da177e4SLinus Torvalds res = rpci->ops->downcall(filp, buf, len); 2471b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2481da177e4SLinus Torvalds return res; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds static unsigned int 2521da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds struct rpc_inode *rpci; 2551da177e4SLinus Torvalds unsigned int mask = 0; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds rpci = RPC_I(filp->f_dentry->d_inode); 2581da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 2611da177e4SLinus Torvalds if (rpci->ops == NULL) 2621da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 2631da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) 2641da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 2651da177e4SLinus Torvalds return mask; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds static int 2691da177e4SLinus Torvalds rpc_pipe_ioctl(struct inode *ino, struct file *filp, 2701da177e4SLinus Torvalds unsigned int cmd, unsigned long arg) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); 2731da177e4SLinus Torvalds int len; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds switch (cmd) { 2761da177e4SLinus Torvalds case FIONREAD: 2771da177e4SLinus Torvalds if (rpci->ops == NULL) 2781da177e4SLinus Torvalds return -EPIPE; 2791da177e4SLinus Torvalds len = rpci->pipelen; 2801da177e4SLinus Torvalds if (filp->private_data) { 2811da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2821da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 2831da177e4SLinus Torvalds len += msg->len - msg->copied; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 2861da177e4SLinus Torvalds default: 2871da177e4SLinus Torvalds return -EINVAL; 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds static struct file_operations rpc_pipe_fops = { 2921da177e4SLinus Torvalds .owner = THIS_MODULE, 2931da177e4SLinus Torvalds .llseek = no_llseek, 2941da177e4SLinus Torvalds .read = rpc_pipe_read, 2951da177e4SLinus Torvalds .write = rpc_pipe_write, 2961da177e4SLinus Torvalds .poll = rpc_pipe_poll, 2971da177e4SLinus Torvalds .ioctl = rpc_pipe_ioctl, 2981da177e4SLinus Torvalds .open = rpc_pipe_open, 2991da177e4SLinus Torvalds .release = rpc_pipe_release, 3001da177e4SLinus Torvalds }; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static int 3031da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3081da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3091da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 3101da177e4SLinus Torvalds seq_printf(m, "address: %u.%u.%u.%u\n", 3111da177e4SLinus Torvalds NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); 3121da177e4SLinus Torvalds seq_printf(m, "protocol: %s\n", 3131da177e4SLinus Torvalds clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); 3141da177e4SLinus Torvalds return 0; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static int 3181da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds struct rpc_clnt *clnt; 3211da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds if (!ret) { 3241da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3251b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3261da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 3271da177e4SLinus Torvalds if (clnt) { 3281da177e4SLinus Torvalds atomic_inc(&clnt->cl_users); 3291da177e4SLinus Torvalds m->private = clnt; 3301da177e4SLinus Torvalds } else { 3311da177e4SLinus Torvalds single_release(inode, file); 3321da177e4SLinus Torvalds ret = -EINVAL; 3331da177e4SLinus Torvalds } 3341b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds return ret; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds static int 3401da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3431da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds if (clnt) 3461da177e4SLinus Torvalds rpc_release_client(clnt); 3471da177e4SLinus Torvalds return single_release(inode, file); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static struct file_operations rpc_info_operations = { 3511da177e4SLinus Torvalds .owner = THIS_MODULE, 3521da177e4SLinus Torvalds .open = rpc_info_open, 3531da177e4SLinus Torvalds .read = seq_read, 3541da177e4SLinus Torvalds .llseek = seq_lseek, 3551da177e4SLinus Torvalds .release = rpc_info_release, 3561da177e4SLinus Torvalds }; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds /* 3601da177e4SLinus Torvalds * We have a single directory with 1 node in it. 3611da177e4SLinus Torvalds */ 3621da177e4SLinus Torvalds enum { 3631da177e4SLinus Torvalds RPCAUTH_Root = 1, 3641da177e4SLinus Torvalds RPCAUTH_lockd, 3651da177e4SLinus Torvalds RPCAUTH_mount, 3661da177e4SLinus Torvalds RPCAUTH_nfs, 3671da177e4SLinus Torvalds RPCAUTH_portmap, 3681da177e4SLinus Torvalds RPCAUTH_statd, 3691da177e4SLinus Torvalds RPCAUTH_RootEOF 3701da177e4SLinus Torvalds }; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * Description of fs contents. 3741da177e4SLinus Torvalds */ 3751da177e4SLinus Torvalds struct rpc_filelist { 3761da177e4SLinus Torvalds char *name; 3771da177e4SLinus Torvalds struct file_operations *i_fop; 3781da177e4SLinus Torvalds int mode; 3791da177e4SLinus Torvalds }; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds static struct rpc_filelist files[] = { 3821da177e4SLinus Torvalds [RPCAUTH_lockd] = { 3831da177e4SLinus Torvalds .name = "lockd", 3841da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3851da177e4SLinus Torvalds }, 3861da177e4SLinus Torvalds [RPCAUTH_mount] = { 3871da177e4SLinus Torvalds .name = "mount", 3881da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3891da177e4SLinus Torvalds }, 3901da177e4SLinus Torvalds [RPCAUTH_nfs] = { 3911da177e4SLinus Torvalds .name = "nfs", 3921da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3931da177e4SLinus Torvalds }, 3941da177e4SLinus Torvalds [RPCAUTH_portmap] = { 3951da177e4SLinus Torvalds .name = "portmap", 3961da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3971da177e4SLinus Torvalds }, 3981da177e4SLinus Torvalds [RPCAUTH_statd] = { 3991da177e4SLinus Torvalds .name = "statd", 4001da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 4011da177e4SLinus Torvalds }, 4021da177e4SLinus Torvalds }; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds enum { 4051da177e4SLinus Torvalds RPCAUTH_info = 2, 4061da177e4SLinus Torvalds RPCAUTH_EOF 4071da177e4SLinus Torvalds }; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds static struct rpc_filelist authfiles[] = { 4101da177e4SLinus Torvalds [RPCAUTH_info] = { 4111da177e4SLinus Torvalds .name = "info", 4121da177e4SLinus Torvalds .i_fop = &rpc_info_operations, 4131da177e4SLinus Torvalds .mode = S_IFREG | S_IRUSR, 4141da177e4SLinus Torvalds }, 4151da177e4SLinus Torvalds }; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds static int 4181da177e4SLinus Torvalds rpc_get_mount(void) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds static void 4241da177e4SLinus Torvalds rpc_put_mount(void) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds simple_release_fs(&rpc_mount, &rpc_mount_count); 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 429f134585aSTrond Myklebust static int 430f134585aSTrond Myklebust rpc_lookup_parent(char *path, struct nameidata *nd) 431f134585aSTrond Myklebust { 432f134585aSTrond Myklebust if (path[0] == '\0') 433f134585aSTrond Myklebust return -ENOENT; 434f134585aSTrond Myklebust if (rpc_get_mount()) { 435f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to mount " 436f134585aSTrond Myklebust "pseudofilesystem \n", __FILE__, __FUNCTION__); 437f134585aSTrond Myklebust return -ENODEV; 438f134585aSTrond Myklebust } 439f134585aSTrond Myklebust nd->mnt = mntget(rpc_mount); 440f134585aSTrond Myklebust nd->dentry = dget(rpc_mount->mnt_root); 441f134585aSTrond Myklebust nd->last_type = LAST_ROOT; 442f134585aSTrond Myklebust nd->flags = LOOKUP_PARENT; 443f134585aSTrond Myklebust nd->depth = 0; 444f134585aSTrond Myklebust 445f134585aSTrond Myklebust if (path_walk(path, nd)) { 446f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to find path %s\n", 447f134585aSTrond Myklebust __FILE__, __FUNCTION__, path); 448f134585aSTrond Myklebust rpc_put_mount(); 449f134585aSTrond Myklebust return -ENOENT; 450f134585aSTrond Myklebust } 451f134585aSTrond Myklebust return 0; 452f134585aSTrond Myklebust } 453f134585aSTrond Myklebust 454f134585aSTrond Myklebust static void 455f134585aSTrond Myklebust rpc_release_path(struct nameidata *nd) 456f134585aSTrond Myklebust { 457f134585aSTrond Myklebust path_release(nd); 458f134585aSTrond Myklebust rpc_put_mount(); 459f134585aSTrond Myklebust } 460f134585aSTrond Myklebust 4611da177e4SLinus Torvalds static struct inode * 4621da177e4SLinus Torvalds rpc_get_inode(struct super_block *sb, int mode) 4631da177e4SLinus Torvalds { 4641da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4651da177e4SLinus Torvalds if (!inode) 4661da177e4SLinus Torvalds return NULL; 4671da177e4SLinus Torvalds inode->i_mode = mode; 4681da177e4SLinus Torvalds inode->i_uid = inode->i_gid = 0; 4691da177e4SLinus Torvalds inode->i_blksize = PAGE_CACHE_SIZE; 4701da177e4SLinus Torvalds inode->i_blocks = 0; 4711da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4721da177e4SLinus Torvalds switch(mode & S_IFMT) { 4731da177e4SLinus Torvalds case S_IFDIR: 4741da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4751da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 4761da177e4SLinus Torvalds inode->i_nlink++; 4771da177e4SLinus Torvalds default: 4781da177e4SLinus Torvalds break; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds return inode; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds /* 4841da177e4SLinus Torvalds * FIXME: This probably has races. 4851da177e4SLinus Torvalds */ 4861da177e4SLinus Torvalds static void 4871da177e4SLinus Torvalds rpc_depopulate(struct dentry *parent) 4881da177e4SLinus Torvalds { 4891da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 4901da177e4SLinus Torvalds struct list_head *pos, *next; 4911da177e4SLinus Torvalds struct dentry *dentry, *dvec[10]; 4921da177e4SLinus Torvalds int n = 0; 4931da177e4SLinus Torvalds 4941b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 4951da177e4SLinus Torvalds repeat: 4961da177e4SLinus Torvalds spin_lock(&dcache_lock); 4971da177e4SLinus Torvalds list_for_each_safe(pos, next, &parent->d_subdirs) { 4985160ee6fSEric Dumazet dentry = list_entry(pos, struct dentry, d_u.d_child); 4991da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 5001da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 5011da177e4SLinus Torvalds dget_locked(dentry); 5021da177e4SLinus Torvalds __d_drop(dentry); 5031da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 5041da177e4SLinus Torvalds dvec[n++] = dentry; 5051da177e4SLinus Torvalds if (n == ARRAY_SIZE(dvec)) 5061da177e4SLinus Torvalds break; 5071da177e4SLinus Torvalds } else 5081da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds spin_unlock(&dcache_lock); 5111da177e4SLinus Torvalds if (n) { 5121da177e4SLinus Torvalds do { 5131da177e4SLinus Torvalds dentry = dvec[--n]; 5141da177e4SLinus Torvalds if (dentry->d_inode) { 5151da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 5161da177e4SLinus Torvalds simple_unlink(dir, dentry); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds dput(dentry); 5191da177e4SLinus Torvalds } while (n); 5201da177e4SLinus Torvalds goto repeat; 5211da177e4SLinus Torvalds } 5221b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds static int 5261da177e4SLinus Torvalds rpc_populate(struct dentry *parent, 5271da177e4SLinus Torvalds struct rpc_filelist *files, 5281da177e4SLinus Torvalds int start, int eof) 5291da177e4SLinus Torvalds { 5301da177e4SLinus Torvalds struct inode *inode, *dir = parent->d_inode; 5311da177e4SLinus Torvalds void *private = RPC_I(dir)->private; 5321da177e4SLinus Torvalds struct dentry *dentry; 5331da177e4SLinus Torvalds int mode, i; 5341da177e4SLinus Torvalds 5351b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 5361da177e4SLinus Torvalds for (i = start; i < eof; i++) { 5371da177e4SLinus Torvalds dentry = d_alloc_name(parent, files[i].name); 5381da177e4SLinus Torvalds if (!dentry) 5391da177e4SLinus Torvalds goto out_bad; 5401da177e4SLinus Torvalds mode = files[i].mode; 5411da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, mode); 5421da177e4SLinus Torvalds if (!inode) { 5431da177e4SLinus Torvalds dput(dentry); 5441da177e4SLinus Torvalds goto out_bad; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds inode->i_ino = i; 5471da177e4SLinus Torvalds if (files[i].i_fop) 5481da177e4SLinus Torvalds inode->i_fop = files[i].i_fop; 5491da177e4SLinus Torvalds if (private) 5501da177e4SLinus Torvalds rpc_inode_setowner(inode, private); 5511da177e4SLinus Torvalds if (S_ISDIR(mode)) 5521da177e4SLinus Torvalds dir->i_nlink++; 5531da177e4SLinus Torvalds d_add(dentry, inode); 5541da177e4SLinus Torvalds } 5551b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5561da177e4SLinus Torvalds return 0; 5571da177e4SLinus Torvalds out_bad: 5581b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 5591da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 5601da177e4SLinus Torvalds __FILE__, __FUNCTION__, parent->d_name.name); 5611da177e4SLinus Torvalds return -ENOMEM; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 564f134585aSTrond Myklebust static int 565f134585aSTrond Myklebust __rpc_mkdir(struct inode *dir, struct dentry *dentry) 5661da177e4SLinus Torvalds { 5671da177e4SLinus Torvalds struct inode *inode; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); 5701da177e4SLinus Torvalds if (!inode) 571f134585aSTrond Myklebust goto out_err; 5721da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 573278c995cSChristoph Hellwig d_instantiate(dentry, inode); 574f134585aSTrond Myklebust dir->i_nlink++; 575278c995cSChristoph Hellwig inode_dir_notify(dir, DN_CREATE); 576f134585aSTrond Myklebust rpc_get_mount(); 577f134585aSTrond Myklebust return 0; 578f134585aSTrond Myklebust out_err: 579f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 580f134585aSTrond Myklebust __FILE__, __FUNCTION__, dentry->d_name.name); 581f134585aSTrond Myklebust return -ENOMEM; 582278c995cSChristoph Hellwig } 583278c995cSChristoph Hellwig 584f134585aSTrond Myklebust static int 585f134585aSTrond Myklebust __rpc_rmdir(struct inode *dir, struct dentry *dentry) 586278c995cSChristoph Hellwig { 587f134585aSTrond Myklebust int error; 588278c995cSChristoph Hellwig 589f134585aSTrond Myklebust shrink_dcache_parent(dentry); 5906070fe6fSTrond Myklebust if (dentry->d_inode) 591278c995cSChristoph Hellwig rpc_close_pipes(dentry->d_inode); 592f134585aSTrond Myklebust if ((error = simple_rmdir(dir, dentry)) != 0) 593f134585aSTrond Myklebust return error; 594f134585aSTrond Myklebust if (!error) { 595f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 596f134585aSTrond Myklebust d_drop(dentry); 597278c995cSChristoph Hellwig rpc_put_mount(); 5981da177e4SLinus Torvalds } 599f134585aSTrond Myklebust return 0; 600f134585aSTrond Myklebust } 601f134585aSTrond Myklebust 602f134585aSTrond Myklebust static struct dentry * 603f134585aSTrond Myklebust rpc_lookup_negative(char *path, struct nameidata *nd) 604f134585aSTrond Myklebust { 605f134585aSTrond Myklebust struct dentry *dentry; 606f134585aSTrond Myklebust struct inode *dir; 607f134585aSTrond Myklebust int error; 608f134585aSTrond Myklebust 609f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, nd)) != 0) 610f134585aSTrond Myklebust return ERR_PTR(error); 611f134585aSTrond Myklebust dir = nd->dentry->d_inode; 6121b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 61349705b77SChristoph Hellwig dentry = lookup_hash(nd); 614f134585aSTrond Myklebust if (IS_ERR(dentry)) 615f134585aSTrond Myklebust goto out_err; 616f134585aSTrond Myklebust if (dentry->d_inode) { 617f134585aSTrond Myklebust dput(dentry); 618f134585aSTrond Myklebust dentry = ERR_PTR(-EEXIST); 619f134585aSTrond Myklebust goto out_err; 620f134585aSTrond Myklebust } 621f134585aSTrond Myklebust return dentry; 622f134585aSTrond Myklebust out_err: 6231b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 624f134585aSTrond Myklebust rpc_release_path(nd); 625f134585aSTrond Myklebust return dentry; 626f134585aSTrond Myklebust } 627f134585aSTrond Myklebust 628f134585aSTrond Myklebust 629f134585aSTrond Myklebust struct dentry * 630f134585aSTrond Myklebust rpc_mkdir(char *path, struct rpc_clnt *rpc_client) 631f134585aSTrond Myklebust { 632f134585aSTrond Myklebust struct nameidata nd; 633f134585aSTrond Myklebust struct dentry *dentry; 634f134585aSTrond Myklebust struct inode *dir; 635f134585aSTrond Myklebust int error; 636f134585aSTrond Myklebust 637f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 638f134585aSTrond Myklebust if (IS_ERR(dentry)) 639f134585aSTrond Myklebust return dentry; 640f134585aSTrond Myklebust dir = nd.dentry->d_inode; 641f134585aSTrond Myklebust if ((error = __rpc_mkdir(dir, dentry)) != 0) 642f134585aSTrond Myklebust goto err_dput; 643f134585aSTrond Myklebust RPC_I(dentry->d_inode)->private = rpc_client; 644f134585aSTrond Myklebust error = rpc_populate(dentry, authfiles, 645f134585aSTrond Myklebust RPCAUTH_info, RPCAUTH_EOF); 646f134585aSTrond Myklebust if (error) 647f134585aSTrond Myklebust goto err_depopulate; 648f134585aSTrond Myklebust out: 6491b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 650f134585aSTrond Myklebust rpc_release_path(&nd); 651f134585aSTrond Myklebust return dentry; 652f134585aSTrond Myklebust err_depopulate: 653f134585aSTrond Myklebust rpc_depopulate(dentry); 654f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 655f134585aSTrond Myklebust err_dput: 656f134585aSTrond Myklebust dput(dentry); 657f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", 658f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, error); 659f134585aSTrond Myklebust dentry = ERR_PTR(error); 660f134585aSTrond Myklebust goto out; 661f134585aSTrond Myklebust } 662f134585aSTrond Myklebust 663f134585aSTrond Myklebust int 664f134585aSTrond Myklebust rpc_rmdir(char *path) 665f134585aSTrond Myklebust { 666f134585aSTrond Myklebust struct nameidata nd; 667f134585aSTrond Myklebust struct dentry *dentry; 668f134585aSTrond Myklebust struct inode *dir; 669f134585aSTrond Myklebust int error; 670f134585aSTrond Myklebust 671f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 672f134585aSTrond Myklebust return error; 673f134585aSTrond Myklebust dir = nd.dentry->d_inode; 6741b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 67549705b77SChristoph Hellwig dentry = lookup_hash(&nd); 676f134585aSTrond Myklebust if (IS_ERR(dentry)) { 677f134585aSTrond Myklebust error = PTR_ERR(dentry); 678f134585aSTrond Myklebust goto out_release; 679f134585aSTrond Myklebust } 680f134585aSTrond Myklebust rpc_depopulate(dentry); 681f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 682f134585aSTrond Myklebust dput(dentry); 683f134585aSTrond Myklebust out_release: 6841b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 685f134585aSTrond Myklebust rpc_release_path(&nd); 686f134585aSTrond Myklebust return error; 687f134585aSTrond Myklebust } 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds struct dentry * 690f134585aSTrond Myklebust rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) 6911da177e4SLinus Torvalds { 692f134585aSTrond Myklebust struct nameidata nd; 6931da177e4SLinus Torvalds struct dentry *dentry; 694f134585aSTrond Myklebust struct inode *dir, *inode; 6951da177e4SLinus Torvalds struct rpc_inode *rpci; 6961da177e4SLinus Torvalds 697f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 6981da177e4SLinus Torvalds if (IS_ERR(dentry)) 699f134585aSTrond Myklebust return dentry; 700f134585aSTrond Myklebust dir = nd.dentry->d_inode; 701f134585aSTrond Myklebust inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); 702f134585aSTrond Myklebust if (!inode) 703f134585aSTrond Myklebust goto err_dput; 7041da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 7051da177e4SLinus Torvalds inode->i_fop = &rpc_pipe_fops; 706f134585aSTrond Myklebust d_instantiate(dentry, inode); 7071da177e4SLinus Torvalds rpci = RPC_I(inode); 7081da177e4SLinus Torvalds rpci->private = private; 7091da177e4SLinus Torvalds rpci->flags = flags; 7101da177e4SLinus Torvalds rpci->ops = ops; 7111da177e4SLinus Torvalds inode_dir_notify(dir, DN_CREATE); 712f134585aSTrond Myklebust out: 7131b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 714f134585aSTrond Myklebust rpc_release_path(&nd); 7151da177e4SLinus Torvalds return dentry; 716f134585aSTrond Myklebust err_dput: 7171da177e4SLinus Torvalds dput(dentry); 718f134585aSTrond Myklebust dentry = ERR_PTR(-ENOMEM); 719f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", 720f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, -ENOMEM); 721f134585aSTrond Myklebust goto out; 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 724f134585aSTrond Myklebust int 725f134585aSTrond Myklebust rpc_unlink(char *path) 7261da177e4SLinus Torvalds { 727f134585aSTrond Myklebust struct nameidata nd; 728f134585aSTrond Myklebust struct dentry *dentry; 729f134585aSTrond Myklebust struct inode *dir; 730f134585aSTrond Myklebust int error; 7311da177e4SLinus Torvalds 732f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 733f134585aSTrond Myklebust return error; 734f134585aSTrond Myklebust dir = nd.dentry->d_inode; 7351b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 73649705b77SChristoph Hellwig dentry = lookup_hash(&nd); 737f134585aSTrond Myklebust if (IS_ERR(dentry)) { 738f134585aSTrond Myklebust error = PTR_ERR(dentry); 739f134585aSTrond Myklebust goto out_release; 740f134585aSTrond Myklebust } 741f134585aSTrond Myklebust d_drop(dentry); 7421da177e4SLinus Torvalds if (dentry->d_inode) { 7431da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 744f134585aSTrond Myklebust error = simple_unlink(dir, dentry); 7451da177e4SLinus Torvalds } 746f134585aSTrond Myklebust dput(dentry); 747f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 748f134585aSTrond Myklebust out_release: 7491b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 750f134585aSTrond Myklebust rpc_release_path(&nd); 751f134585aSTrond Myklebust return error; 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds /* 7551da177e4SLinus Torvalds * populate the filesystem 7561da177e4SLinus Torvalds */ 7571da177e4SLinus Torvalds static struct super_operations s_ops = { 7581da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 7591da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 7601da177e4SLinus Torvalds .statfs = simple_statfs, 7611da177e4SLinus Torvalds }; 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds static int 7661da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 7671da177e4SLinus Torvalds { 7681da177e4SLinus Torvalds struct inode *inode; 7691da177e4SLinus Torvalds struct dentry *root; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 7721da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 7731da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 7741da177e4SLinus Torvalds sb->s_op = &s_ops; 7751da177e4SLinus Torvalds sb->s_time_gran = 1; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 7781da177e4SLinus Torvalds if (!inode) 7791da177e4SLinus Torvalds return -ENOMEM; 7801da177e4SLinus Torvalds root = d_alloc_root(inode); 7811da177e4SLinus Torvalds if (!root) { 7821da177e4SLinus Torvalds iput(inode); 7831da177e4SLinus Torvalds return -ENOMEM; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) 7861da177e4SLinus Torvalds goto out; 7871da177e4SLinus Torvalds sb->s_root = root; 7881da177e4SLinus Torvalds return 0; 7891da177e4SLinus Torvalds out: 7901da177e4SLinus Torvalds d_genocide(root); 7911da177e4SLinus Torvalds dput(root); 7921da177e4SLinus Torvalds return -ENOMEM; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds static struct super_block * 7961da177e4SLinus Torvalds rpc_get_sb(struct file_system_type *fs_type, 7971da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 7981da177e4SLinus Torvalds { 7991da177e4SLinus Torvalds return get_sb_single(fs_type, flags, data, rpc_fill_super); 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 8031da177e4SLinus Torvalds .owner = THIS_MODULE, 8041da177e4SLinus Torvalds .name = "rpc_pipefs", 8051da177e4SLinus Torvalds .get_sb = rpc_get_sb, 8061da177e4SLinus Torvalds .kill_sb = kill_litter_super, 8071da177e4SLinus Torvalds }; 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds static void 8101da177e4SLinus Torvalds init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 8151da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) { 8161da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 8171da177e4SLinus Torvalds rpci->private = NULL; 8181da177e4SLinus Torvalds rpci->nreaders = 0; 8191da177e4SLinus Torvalds rpci->nwriters = 0; 8201da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->in_upcall); 8211da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->pipe); 8221da177e4SLinus Torvalds rpci->pipelen = 0; 8231da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 8241da177e4SLinus Torvalds INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); 8251da177e4SLinus Torvalds rpci->ops = NULL; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds int register_rpc_pipefs(void) 8301da177e4SLinus Torvalds { 8311da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 8321da177e4SLinus Torvalds sizeof(struct rpc_inode), 8331da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 8341da177e4SLinus Torvalds init_once, NULL); 8351da177e4SLinus Torvalds if (!rpc_inode_cachep) 8361da177e4SLinus Torvalds return -ENOMEM; 8371da177e4SLinus Torvalds register_filesystem(&rpc_pipe_fs_type); 8381da177e4SLinus Torvalds return 0; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 8421da177e4SLinus Torvalds { 8431da177e4SLinus Torvalds if (kmem_cache_destroy(rpc_inode_cachep)) 8441da177e4SLinus Torvalds printk(KERN_WARNING "RPC: unable to free inode cache\n"); 8451da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 8461da177e4SLinus Torvalds } 847