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 421da177e4SLinus Torvalds __rpc_purge_upcall(struct inode *inode, int err) 431da177e4SLinus Torvalds { 441da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 451da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds while (!list_empty(&rpci->pipe)) { 481da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list); 491da177e4SLinus Torvalds list_del_init(&msg->list); 501da177e4SLinus Torvalds msg->errno = err; 511da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds while (!list_empty(&rpci->in_upcall)) { 541da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list); 551da177e4SLinus Torvalds list_del_init(&msg->list); 561da177e4SLinus Torvalds msg->errno = err; 571da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds rpci->pipelen = 0; 601da177e4SLinus Torvalds wake_up(&rpci->waitq); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds static void 641da177e4SLinus Torvalds rpc_timeout_upcall_queue(void *data) 651da177e4SLinus Torvalds { 661da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *)data; 671da177e4SLinus Torvalds struct inode *inode = &rpci->vfs_inode; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds down(&inode->i_sem); 701da177e4SLinus Torvalds if (rpci->nreaders == 0 && !list_empty(&rpci->pipe)) 711da177e4SLinus Torvalds __rpc_purge_upcall(inode, -ETIMEDOUT); 721da177e4SLinus Torvalds up(&inode->i_sem); 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds int 761da177e4SLinus Torvalds rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 796070fe6fSTrond Myklebust int res = -EPIPE; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds down(&inode->i_sem); 826070fe6fSTrond Myklebust if (rpci->ops == NULL) 836070fe6fSTrond Myklebust goto out; 841da177e4SLinus Torvalds if (rpci->nreaders) { 851da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 861da177e4SLinus Torvalds rpci->pipelen += msg->len; 876070fe6fSTrond Myklebust res = 0; 881da177e4SLinus Torvalds } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { 891da177e4SLinus Torvalds if (list_empty(&rpci->pipe)) 901da177e4SLinus Torvalds schedule_delayed_work(&rpci->queue_timeout, 911da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 921da177e4SLinus Torvalds list_add_tail(&msg->list, &rpci->pipe); 931da177e4SLinus Torvalds rpci->pipelen += msg->len; 946070fe6fSTrond Myklebust res = 0; 956070fe6fSTrond Myklebust } 966070fe6fSTrond Myklebust out: 971da177e4SLinus Torvalds up(&inode->i_sem); 981da177e4SLinus Torvalds wake_up(&rpci->waitq); 991da177e4SLinus Torvalds return res; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1026070fe6fSTrond Myklebust static inline void 1036070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1046070fe6fSTrond Myklebust { 1056070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1066070fe6fSTrond Myklebust } 1076070fe6fSTrond Myklebust 1081da177e4SLinus Torvalds static void 1091da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds cancel_delayed_work(&rpci->queue_timeout); 1141da177e4SLinus Torvalds flush_scheduled_work(); 1151da177e4SLinus Torvalds down(&inode->i_sem); 1161da177e4SLinus Torvalds if (rpci->ops != NULL) { 1171da177e4SLinus Torvalds rpci->nreaders = 0; 1181da177e4SLinus Torvalds __rpc_purge_upcall(inode, -EPIPE); 1191da177e4SLinus Torvalds rpci->nwriters = 0; 1201da177e4SLinus Torvalds if (rpci->ops->release_pipe) 1211da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 1221da177e4SLinus Torvalds rpci->ops = NULL; 1231da177e4SLinus Torvalds } 1246070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1251da177e4SLinus Torvalds up(&inode->i_sem); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds static struct inode * 1291da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds struct rpc_inode *rpci; 1321da177e4SLinus Torvalds rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); 1331da177e4SLinus Torvalds if (!rpci) 1341da177e4SLinus Torvalds return NULL; 1351da177e4SLinus Torvalds return &rpci->vfs_inode; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds static void 1391da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds static int 1451da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 1461da177e4SLinus Torvalds { 1471da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1481da177e4SLinus Torvalds int res = -ENXIO; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds down(&inode->i_sem); 1511da177e4SLinus Torvalds if (rpci->ops != NULL) { 1521da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1531da177e4SLinus Torvalds rpci->nreaders ++; 1541da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1551da177e4SLinus Torvalds rpci->nwriters ++; 1561da177e4SLinus Torvalds res = 0; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds up(&inode->i_sem); 1591da177e4SLinus Torvalds return res; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static int 1631da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); 1661da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds down(&inode->i_sem); 1691da177e4SLinus Torvalds if (rpci->ops == NULL) 1701da177e4SLinus Torvalds goto out; 1711da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 1721da177e4SLinus Torvalds if (msg != NULL) { 1731da177e4SLinus Torvalds msg->errno = -EPIPE; 1741da177e4SLinus Torvalds list_del_init(&msg->list); 1751da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1781da177e4SLinus Torvalds rpci->nwriters --; 1791da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 1801da177e4SLinus Torvalds rpci->nreaders --; 1811da177e4SLinus Torvalds if (!rpci->nreaders) 1821da177e4SLinus Torvalds __rpc_purge_upcall(inode, -EPIPE); 1831da177e4SLinus Torvalds if (rpci->ops->release_pipe) 1841da177e4SLinus Torvalds rpci->ops->release_pipe(inode); 1851da177e4SLinus Torvalds out: 1861da177e4SLinus Torvalds up(&inode->i_sem); 1871da177e4SLinus Torvalds return 0; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static ssize_t 1911da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 1941da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 1951da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 1961da177e4SLinus Torvalds int res = 0; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds down(&inode->i_sem); 1991da177e4SLinus Torvalds if (rpci->ops == NULL) { 2001da177e4SLinus Torvalds res = -EPIPE; 2011da177e4SLinus Torvalds goto out_unlock; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds msg = filp->private_data; 2041da177e4SLinus Torvalds if (msg == NULL) { 2051da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) { 2061da177e4SLinus Torvalds msg = list_entry(rpci->pipe.next, 2071da177e4SLinus Torvalds struct rpc_pipe_msg, 2081da177e4SLinus Torvalds list); 2091da177e4SLinus Torvalds list_move(&msg->list, &rpci->in_upcall); 2101da177e4SLinus Torvalds rpci->pipelen -= msg->len; 2111da177e4SLinus Torvalds filp->private_data = msg; 2121da177e4SLinus Torvalds msg->copied = 0; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds if (msg == NULL) 2151da177e4SLinus Torvalds goto out_unlock; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 2181da177e4SLinus Torvalds res = rpci->ops->upcall(filp, msg, buf, len); 2191da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 2201da177e4SLinus Torvalds filp->private_data = NULL; 2211da177e4SLinus Torvalds list_del_init(&msg->list); 2221da177e4SLinus Torvalds rpci->ops->destroy_msg(msg); 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds out_unlock: 2251da177e4SLinus Torvalds up(&inode->i_sem); 2261da177e4SLinus Torvalds return res; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static ssize_t 2301da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 2311da177e4SLinus Torvalds { 2321da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2331da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 2341da177e4SLinus Torvalds int res; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds down(&inode->i_sem); 2371da177e4SLinus Torvalds res = -EPIPE; 2381da177e4SLinus Torvalds if (rpci->ops != NULL) 2391da177e4SLinus Torvalds res = rpci->ops->downcall(filp, buf, len); 2401da177e4SLinus Torvalds up(&inode->i_sem); 2411da177e4SLinus Torvalds return res; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds static unsigned int 2451da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 2461da177e4SLinus Torvalds { 2471da177e4SLinus Torvalds struct rpc_inode *rpci; 2481da177e4SLinus Torvalds unsigned int mask = 0; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds rpci = RPC_I(filp->f_dentry->d_inode); 2511da177e4SLinus Torvalds poll_wait(filp, &rpci->waitq, wait); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 2541da177e4SLinus Torvalds if (rpci->ops == NULL) 2551da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 2561da177e4SLinus Torvalds if (!list_empty(&rpci->pipe)) 2571da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 2581da177e4SLinus Torvalds return mask; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds static int 2621da177e4SLinus Torvalds rpc_pipe_ioctl(struct inode *ino, struct file *filp, 2631da177e4SLinus Torvalds unsigned int cmd, unsigned long arg) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); 2661da177e4SLinus Torvalds int len; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds switch (cmd) { 2691da177e4SLinus Torvalds case FIONREAD: 2701da177e4SLinus Torvalds if (rpci->ops == NULL) 2711da177e4SLinus Torvalds return -EPIPE; 2721da177e4SLinus Torvalds len = rpci->pipelen; 2731da177e4SLinus Torvalds if (filp->private_data) { 2741da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2751da177e4SLinus Torvalds msg = (struct rpc_pipe_msg *)filp->private_data; 2761da177e4SLinus Torvalds len += msg->len - msg->copied; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 2791da177e4SLinus Torvalds default: 2801da177e4SLinus Torvalds return -EINVAL; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds static struct file_operations rpc_pipe_fops = { 2851da177e4SLinus Torvalds .owner = THIS_MODULE, 2861da177e4SLinus Torvalds .llseek = no_llseek, 2871da177e4SLinus Torvalds .read = rpc_pipe_read, 2881da177e4SLinus Torvalds .write = rpc_pipe_write, 2891da177e4SLinus Torvalds .poll = rpc_pipe_poll, 2901da177e4SLinus Torvalds .ioctl = rpc_pipe_ioctl, 2911da177e4SLinus Torvalds .open = rpc_pipe_open, 2921da177e4SLinus Torvalds .release = rpc_pipe_release, 2931da177e4SLinus Torvalds }; 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static int 2961da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 2971da177e4SLinus Torvalds { 2981da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3011da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3021da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 3031da177e4SLinus Torvalds seq_printf(m, "address: %u.%u.%u.%u\n", 3041da177e4SLinus Torvalds NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); 3051da177e4SLinus Torvalds seq_printf(m, "protocol: %s\n", 3061da177e4SLinus Torvalds clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); 3071da177e4SLinus Torvalds return 0; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static int 3111da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 3121da177e4SLinus Torvalds { 3131da177e4SLinus Torvalds struct rpc_clnt *clnt; 3141da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds if (!ret) { 3171da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3181da177e4SLinus Torvalds down(&inode->i_sem); 3191da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 3201da177e4SLinus Torvalds if (clnt) { 3211da177e4SLinus Torvalds atomic_inc(&clnt->cl_users); 3221da177e4SLinus Torvalds m->private = clnt; 3231da177e4SLinus Torvalds } else { 3241da177e4SLinus Torvalds single_release(inode, file); 3251da177e4SLinus Torvalds ret = -EINVAL; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds up(&inode->i_sem); 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds return ret; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds static int 3331da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 3341da177e4SLinus Torvalds { 3351da177e4SLinus Torvalds struct seq_file *m = file->private_data; 3361da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds if (clnt) 3391da177e4SLinus Torvalds rpc_release_client(clnt); 3401da177e4SLinus Torvalds return single_release(inode, file); 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds static struct file_operations rpc_info_operations = { 3441da177e4SLinus Torvalds .owner = THIS_MODULE, 3451da177e4SLinus Torvalds .open = rpc_info_open, 3461da177e4SLinus Torvalds .read = seq_read, 3471da177e4SLinus Torvalds .llseek = seq_lseek, 3481da177e4SLinus Torvalds .release = rpc_info_release, 3491da177e4SLinus Torvalds }; 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds /* 3531da177e4SLinus Torvalds * We have a single directory with 1 node in it. 3541da177e4SLinus Torvalds */ 3551da177e4SLinus Torvalds enum { 3561da177e4SLinus Torvalds RPCAUTH_Root = 1, 3571da177e4SLinus Torvalds RPCAUTH_lockd, 3581da177e4SLinus Torvalds RPCAUTH_mount, 3591da177e4SLinus Torvalds RPCAUTH_nfs, 3601da177e4SLinus Torvalds RPCAUTH_portmap, 3611da177e4SLinus Torvalds RPCAUTH_statd, 3621da177e4SLinus Torvalds RPCAUTH_RootEOF 3631da177e4SLinus Torvalds }; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds /* 3661da177e4SLinus Torvalds * Description of fs contents. 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds struct rpc_filelist { 3691da177e4SLinus Torvalds char *name; 3701da177e4SLinus Torvalds struct file_operations *i_fop; 3711da177e4SLinus Torvalds int mode; 3721da177e4SLinus Torvalds }; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds static struct rpc_filelist files[] = { 3751da177e4SLinus Torvalds [RPCAUTH_lockd] = { 3761da177e4SLinus Torvalds .name = "lockd", 3771da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3781da177e4SLinus Torvalds }, 3791da177e4SLinus Torvalds [RPCAUTH_mount] = { 3801da177e4SLinus Torvalds .name = "mount", 3811da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3821da177e4SLinus Torvalds }, 3831da177e4SLinus Torvalds [RPCAUTH_nfs] = { 3841da177e4SLinus Torvalds .name = "nfs", 3851da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3861da177e4SLinus Torvalds }, 3871da177e4SLinus Torvalds [RPCAUTH_portmap] = { 3881da177e4SLinus Torvalds .name = "portmap", 3891da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3901da177e4SLinus Torvalds }, 3911da177e4SLinus Torvalds [RPCAUTH_statd] = { 3921da177e4SLinus Torvalds .name = "statd", 3931da177e4SLinus Torvalds .mode = S_IFDIR | S_IRUGO | S_IXUGO, 3941da177e4SLinus Torvalds }, 3951da177e4SLinus Torvalds }; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds enum { 3981da177e4SLinus Torvalds RPCAUTH_info = 2, 3991da177e4SLinus Torvalds RPCAUTH_EOF 4001da177e4SLinus Torvalds }; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds static struct rpc_filelist authfiles[] = { 4031da177e4SLinus Torvalds [RPCAUTH_info] = { 4041da177e4SLinus Torvalds .name = "info", 4051da177e4SLinus Torvalds .i_fop = &rpc_info_operations, 4061da177e4SLinus Torvalds .mode = S_IFREG | S_IRUSR, 4071da177e4SLinus Torvalds }, 4081da177e4SLinus Torvalds }; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds static int 4111da177e4SLinus Torvalds rpc_get_mount(void) 4121da177e4SLinus Torvalds { 4131da177e4SLinus Torvalds return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds static void 4171da177e4SLinus Torvalds rpc_put_mount(void) 4181da177e4SLinus Torvalds { 4191da177e4SLinus Torvalds simple_release_fs(&rpc_mount, &rpc_mount_count); 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 422f134585aSTrond Myklebust static int 423f134585aSTrond Myklebust rpc_lookup_parent(char *path, struct nameidata *nd) 424f134585aSTrond Myklebust { 425f134585aSTrond Myklebust if (path[0] == '\0') 426f134585aSTrond Myklebust return -ENOENT; 427f134585aSTrond Myklebust if (rpc_get_mount()) { 428f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to mount " 429f134585aSTrond Myklebust "pseudofilesystem \n", __FILE__, __FUNCTION__); 430f134585aSTrond Myklebust return -ENODEV; 431f134585aSTrond Myklebust } 432f134585aSTrond Myklebust nd->mnt = mntget(rpc_mount); 433f134585aSTrond Myklebust nd->dentry = dget(rpc_mount->mnt_root); 434f134585aSTrond Myklebust nd->last_type = LAST_ROOT; 435f134585aSTrond Myklebust nd->flags = LOOKUP_PARENT; 436f134585aSTrond Myklebust nd->depth = 0; 437f134585aSTrond Myklebust 438f134585aSTrond Myklebust if (path_walk(path, nd)) { 439f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to find path %s\n", 440f134585aSTrond Myklebust __FILE__, __FUNCTION__, path); 441f134585aSTrond Myklebust rpc_put_mount(); 442f134585aSTrond Myklebust return -ENOENT; 443f134585aSTrond Myklebust } 444f134585aSTrond Myklebust return 0; 445f134585aSTrond Myklebust } 446f134585aSTrond Myklebust 447f134585aSTrond Myklebust static void 448f134585aSTrond Myklebust rpc_release_path(struct nameidata *nd) 449f134585aSTrond Myklebust { 450f134585aSTrond Myklebust path_release(nd); 451f134585aSTrond Myklebust rpc_put_mount(); 452f134585aSTrond Myklebust } 453f134585aSTrond Myklebust 4541da177e4SLinus Torvalds static struct inode * 4551da177e4SLinus Torvalds rpc_get_inode(struct super_block *sb, int mode) 4561da177e4SLinus Torvalds { 4571da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4581da177e4SLinus Torvalds if (!inode) 4591da177e4SLinus Torvalds return NULL; 4601da177e4SLinus Torvalds inode->i_mode = mode; 4611da177e4SLinus Torvalds inode->i_uid = inode->i_gid = 0; 4621da177e4SLinus Torvalds inode->i_blksize = PAGE_CACHE_SIZE; 4631da177e4SLinus Torvalds inode->i_blocks = 0; 4641da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4651da177e4SLinus Torvalds switch(mode & S_IFMT) { 4661da177e4SLinus Torvalds case S_IFDIR: 4671da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4681da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 4691da177e4SLinus Torvalds inode->i_nlink++; 4701da177e4SLinus Torvalds default: 4711da177e4SLinus Torvalds break; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds return inode; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* 4771da177e4SLinus Torvalds * FIXME: This probably has races. 4781da177e4SLinus Torvalds */ 4791da177e4SLinus Torvalds static void 4801da177e4SLinus Torvalds rpc_depopulate(struct dentry *parent) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 4831da177e4SLinus Torvalds struct list_head *pos, *next; 4841da177e4SLinus Torvalds struct dentry *dentry, *dvec[10]; 4851da177e4SLinus Torvalds int n = 0; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds down(&dir->i_sem); 4881da177e4SLinus Torvalds repeat: 4891da177e4SLinus Torvalds spin_lock(&dcache_lock); 4901da177e4SLinus Torvalds list_for_each_safe(pos, next, &parent->d_subdirs) { 4911da177e4SLinus Torvalds dentry = list_entry(pos, struct dentry, d_child); 4921da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 4931da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 4941da177e4SLinus Torvalds dget_locked(dentry); 4951da177e4SLinus Torvalds __d_drop(dentry); 4961da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 4971da177e4SLinus Torvalds dvec[n++] = dentry; 4981da177e4SLinus Torvalds if (n == ARRAY_SIZE(dvec)) 4991da177e4SLinus Torvalds break; 5001da177e4SLinus Torvalds } else 5011da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds spin_unlock(&dcache_lock); 5041da177e4SLinus Torvalds if (n) { 5051da177e4SLinus Torvalds do { 5061da177e4SLinus Torvalds dentry = dvec[--n]; 5071da177e4SLinus Torvalds if (dentry->d_inode) { 5081da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 5091da177e4SLinus Torvalds simple_unlink(dir, dentry); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds dput(dentry); 5121da177e4SLinus Torvalds } while (n); 5131da177e4SLinus Torvalds goto repeat; 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds up(&dir->i_sem); 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds static int 5191da177e4SLinus Torvalds rpc_populate(struct dentry *parent, 5201da177e4SLinus Torvalds struct rpc_filelist *files, 5211da177e4SLinus Torvalds int start, int eof) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds struct inode *inode, *dir = parent->d_inode; 5241da177e4SLinus Torvalds void *private = RPC_I(dir)->private; 5251da177e4SLinus Torvalds struct dentry *dentry; 5261da177e4SLinus Torvalds int mode, i; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds down(&dir->i_sem); 5291da177e4SLinus Torvalds for (i = start; i < eof; i++) { 5301da177e4SLinus Torvalds dentry = d_alloc_name(parent, files[i].name); 5311da177e4SLinus Torvalds if (!dentry) 5321da177e4SLinus Torvalds goto out_bad; 5331da177e4SLinus Torvalds mode = files[i].mode; 5341da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, mode); 5351da177e4SLinus Torvalds if (!inode) { 5361da177e4SLinus Torvalds dput(dentry); 5371da177e4SLinus Torvalds goto out_bad; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds inode->i_ino = i; 5401da177e4SLinus Torvalds if (files[i].i_fop) 5411da177e4SLinus Torvalds inode->i_fop = files[i].i_fop; 5421da177e4SLinus Torvalds if (private) 5431da177e4SLinus Torvalds rpc_inode_setowner(inode, private); 5441da177e4SLinus Torvalds if (S_ISDIR(mode)) 5451da177e4SLinus Torvalds dir->i_nlink++; 5461da177e4SLinus Torvalds d_add(dentry, inode); 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds up(&dir->i_sem); 5491da177e4SLinus Torvalds return 0; 5501da177e4SLinus Torvalds out_bad: 5511da177e4SLinus Torvalds up(&dir->i_sem); 5521da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 5531da177e4SLinus Torvalds __FILE__, __FUNCTION__, parent->d_name.name); 5541da177e4SLinus Torvalds return -ENOMEM; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds 557f134585aSTrond Myklebust static int 558f134585aSTrond Myklebust __rpc_mkdir(struct inode *dir, struct dentry *dentry) 5591da177e4SLinus Torvalds { 5601da177e4SLinus Torvalds struct inode *inode; 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); 5631da177e4SLinus Torvalds if (!inode) 564f134585aSTrond Myklebust goto out_err; 5651da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 566278c995cSChristoph Hellwig d_instantiate(dentry, inode); 567f134585aSTrond Myklebust dir->i_nlink++; 568278c995cSChristoph Hellwig inode_dir_notify(dir, DN_CREATE); 569f134585aSTrond Myklebust rpc_get_mount(); 570f134585aSTrond Myklebust return 0; 571f134585aSTrond Myklebust out_err: 572f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 573f134585aSTrond Myklebust __FILE__, __FUNCTION__, dentry->d_name.name); 574f134585aSTrond Myklebust return -ENOMEM; 575278c995cSChristoph Hellwig } 576278c995cSChristoph Hellwig 577f134585aSTrond Myklebust static int 578f134585aSTrond Myklebust __rpc_rmdir(struct inode *dir, struct dentry *dentry) 579278c995cSChristoph Hellwig { 580f134585aSTrond Myklebust int error; 581278c995cSChristoph Hellwig 582f134585aSTrond Myklebust shrink_dcache_parent(dentry); 5836070fe6fSTrond Myklebust if (dentry->d_inode) 584278c995cSChristoph Hellwig rpc_close_pipes(dentry->d_inode); 585f134585aSTrond Myklebust if ((error = simple_rmdir(dir, dentry)) != 0) 586f134585aSTrond Myklebust return error; 587f134585aSTrond Myklebust if (!error) { 588f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 589f134585aSTrond Myklebust d_drop(dentry); 590278c995cSChristoph Hellwig rpc_put_mount(); 5911da177e4SLinus Torvalds } 592f134585aSTrond Myklebust return 0; 593f134585aSTrond Myklebust } 594f134585aSTrond Myklebust 595f134585aSTrond Myklebust static struct dentry * 596f134585aSTrond Myklebust rpc_lookup_negative(char *path, struct nameidata *nd) 597f134585aSTrond Myklebust { 598f134585aSTrond Myklebust struct dentry *dentry; 599f134585aSTrond Myklebust struct inode *dir; 600f134585aSTrond Myklebust int error; 601f134585aSTrond Myklebust 602f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, nd)) != 0) 603f134585aSTrond Myklebust return ERR_PTR(error); 604f134585aSTrond Myklebust dir = nd->dentry->d_inode; 605f134585aSTrond Myklebust down(&dir->i_sem); 606f134585aSTrond Myklebust dentry = lookup_hash(&nd->last, nd->dentry); 607f134585aSTrond Myklebust if (IS_ERR(dentry)) 608f134585aSTrond Myklebust goto out_err; 609f134585aSTrond Myklebust if (dentry->d_inode) { 610f134585aSTrond Myklebust dput(dentry); 611f134585aSTrond Myklebust dentry = ERR_PTR(-EEXIST); 612f134585aSTrond Myklebust goto out_err; 613f134585aSTrond Myklebust } 614f134585aSTrond Myklebust return dentry; 615f134585aSTrond Myklebust out_err: 616f134585aSTrond Myklebust up(&dir->i_sem); 617f134585aSTrond Myklebust rpc_release_path(nd); 618f134585aSTrond Myklebust return dentry; 619f134585aSTrond Myklebust } 620f134585aSTrond Myklebust 621f134585aSTrond Myklebust 622f134585aSTrond Myklebust struct dentry * 623f134585aSTrond Myklebust rpc_mkdir(char *path, struct rpc_clnt *rpc_client) 624f134585aSTrond Myklebust { 625f134585aSTrond Myklebust struct nameidata nd; 626f134585aSTrond Myklebust struct dentry *dentry; 627f134585aSTrond Myklebust struct inode *dir; 628f134585aSTrond Myklebust int error; 629f134585aSTrond Myklebust 630f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 631f134585aSTrond Myklebust if (IS_ERR(dentry)) 632f134585aSTrond Myklebust return dentry; 633f134585aSTrond Myklebust dir = nd.dentry->d_inode; 634f134585aSTrond Myklebust if ((error = __rpc_mkdir(dir, dentry)) != 0) 635f134585aSTrond Myklebust goto err_dput; 636f134585aSTrond Myklebust RPC_I(dentry->d_inode)->private = rpc_client; 637f134585aSTrond Myklebust error = rpc_populate(dentry, authfiles, 638f134585aSTrond Myklebust RPCAUTH_info, RPCAUTH_EOF); 639f134585aSTrond Myklebust if (error) 640f134585aSTrond Myklebust goto err_depopulate; 641f134585aSTrond Myklebust out: 642f134585aSTrond Myklebust up(&dir->i_sem); 643f134585aSTrond Myklebust rpc_release_path(&nd); 644f134585aSTrond Myklebust return dentry; 645f134585aSTrond Myklebust err_depopulate: 646f134585aSTrond Myklebust rpc_depopulate(dentry); 647f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 648f134585aSTrond Myklebust err_dput: 649f134585aSTrond Myklebust dput(dentry); 650f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", 651f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, error); 652f134585aSTrond Myklebust dentry = ERR_PTR(error); 653f134585aSTrond Myklebust goto out; 654f134585aSTrond Myklebust } 655f134585aSTrond Myklebust 656f134585aSTrond Myklebust int 657f134585aSTrond Myklebust rpc_rmdir(char *path) 658f134585aSTrond Myklebust { 659f134585aSTrond Myklebust struct nameidata nd; 660f134585aSTrond Myklebust struct dentry *dentry; 661f134585aSTrond Myklebust struct inode *dir; 662f134585aSTrond Myklebust int error; 663f134585aSTrond Myklebust 664f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 665f134585aSTrond Myklebust return error; 666f134585aSTrond Myklebust dir = nd.dentry->d_inode; 667f134585aSTrond Myklebust down(&dir->i_sem); 668f134585aSTrond Myklebust dentry = lookup_hash(&nd.last, nd.dentry); 669f134585aSTrond Myklebust if (IS_ERR(dentry)) { 670f134585aSTrond Myklebust error = PTR_ERR(dentry); 671f134585aSTrond Myklebust goto out_release; 672f134585aSTrond Myklebust } 673f134585aSTrond Myklebust rpc_depopulate(dentry); 674f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 675f134585aSTrond Myklebust dput(dentry); 676f134585aSTrond Myklebust out_release: 677f134585aSTrond Myklebust up(&dir->i_sem); 678f134585aSTrond Myklebust rpc_release_path(&nd); 679f134585aSTrond Myklebust return error; 680f134585aSTrond Myklebust } 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds struct dentry * 683f134585aSTrond Myklebust rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) 6841da177e4SLinus Torvalds { 685f134585aSTrond Myklebust struct nameidata nd; 6861da177e4SLinus Torvalds struct dentry *dentry; 687f134585aSTrond Myklebust struct inode *dir, *inode; 6881da177e4SLinus Torvalds struct rpc_inode *rpci; 6891da177e4SLinus Torvalds 690f134585aSTrond Myklebust dentry = rpc_lookup_negative(path, &nd); 6911da177e4SLinus Torvalds if (IS_ERR(dentry)) 692f134585aSTrond Myklebust return dentry; 693f134585aSTrond Myklebust dir = nd.dentry->d_inode; 694f134585aSTrond Myklebust inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); 695f134585aSTrond Myklebust if (!inode) 696f134585aSTrond Myklebust goto err_dput; 6971da177e4SLinus Torvalds inode->i_ino = iunique(dir->i_sb, 100); 6981da177e4SLinus Torvalds inode->i_fop = &rpc_pipe_fops; 699f134585aSTrond Myklebust d_instantiate(dentry, inode); 7001da177e4SLinus Torvalds rpci = RPC_I(inode); 7011da177e4SLinus Torvalds rpci->private = private; 7021da177e4SLinus Torvalds rpci->flags = flags; 7031da177e4SLinus Torvalds rpci->ops = ops; 7041da177e4SLinus Torvalds inode_dir_notify(dir, DN_CREATE); 705f134585aSTrond Myklebust out: 706f134585aSTrond Myklebust up(&dir->i_sem); 707f134585aSTrond Myklebust rpc_release_path(&nd); 7081da177e4SLinus Torvalds return dentry; 709f134585aSTrond Myklebust err_dput: 7101da177e4SLinus Torvalds dput(dentry); 711f134585aSTrond Myklebust dentry = ERR_PTR(-ENOMEM); 712f134585aSTrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", 713f134585aSTrond Myklebust __FILE__, __FUNCTION__, path, -ENOMEM); 714f134585aSTrond Myklebust goto out; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 717f134585aSTrond Myklebust int 718f134585aSTrond Myklebust rpc_unlink(char *path) 7191da177e4SLinus Torvalds { 720f134585aSTrond Myklebust struct nameidata nd; 721f134585aSTrond Myklebust struct dentry *dentry; 722f134585aSTrond Myklebust struct inode *dir; 723f134585aSTrond Myklebust int error; 7241da177e4SLinus Torvalds 725f134585aSTrond Myklebust if ((error = rpc_lookup_parent(path, &nd)) != 0) 726f134585aSTrond Myklebust return error; 727f134585aSTrond Myklebust dir = nd.dentry->d_inode; 728f134585aSTrond Myklebust down(&dir->i_sem); 729f134585aSTrond Myklebust dentry = lookup_hash(&nd.last, nd.dentry); 730f134585aSTrond Myklebust if (IS_ERR(dentry)) { 731f134585aSTrond Myklebust error = PTR_ERR(dentry); 732f134585aSTrond Myklebust goto out_release; 733f134585aSTrond Myklebust } 734f134585aSTrond Myklebust d_drop(dentry); 7351da177e4SLinus Torvalds if (dentry->d_inode) { 7361da177e4SLinus Torvalds rpc_close_pipes(dentry->d_inode); 737f134585aSTrond Myklebust error = simple_unlink(dir, dentry); 7381da177e4SLinus Torvalds } 739f134585aSTrond Myklebust dput(dentry); 740f134585aSTrond Myklebust inode_dir_notify(dir, DN_DELETE); 741f134585aSTrond Myklebust out_release: 742f134585aSTrond Myklebust up(&dir->i_sem); 743f134585aSTrond Myklebust rpc_release_path(&nd); 744f134585aSTrond Myklebust return error; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* 7481da177e4SLinus Torvalds * populate the filesystem 7491da177e4SLinus Torvalds */ 7501da177e4SLinus Torvalds static struct super_operations s_ops = { 7511da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 7521da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 7531da177e4SLinus Torvalds .statfs = simple_statfs, 7541da177e4SLinus Torvalds }; 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds static int 7591da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 7601da177e4SLinus Torvalds { 7611da177e4SLinus Torvalds struct inode *inode; 7621da177e4SLinus Torvalds struct dentry *root; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 7651da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 7661da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 7671da177e4SLinus Torvalds sb->s_op = &s_ops; 7681da177e4SLinus Torvalds sb->s_time_gran = 1; 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 7711da177e4SLinus Torvalds if (!inode) 7721da177e4SLinus Torvalds return -ENOMEM; 7731da177e4SLinus Torvalds root = d_alloc_root(inode); 7741da177e4SLinus Torvalds if (!root) { 7751da177e4SLinus Torvalds iput(inode); 7761da177e4SLinus Torvalds return -ENOMEM; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) 7791da177e4SLinus Torvalds goto out; 7801da177e4SLinus Torvalds sb->s_root = root; 7811da177e4SLinus Torvalds return 0; 7821da177e4SLinus Torvalds out: 7831da177e4SLinus Torvalds d_genocide(root); 7841da177e4SLinus Torvalds dput(root); 7851da177e4SLinus Torvalds return -ENOMEM; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds static struct super_block * 7891da177e4SLinus Torvalds rpc_get_sb(struct file_system_type *fs_type, 7901da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds return get_sb_single(fs_type, flags, data, rpc_fill_super); 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 7961da177e4SLinus Torvalds .owner = THIS_MODULE, 7971da177e4SLinus Torvalds .name = "rpc_pipefs", 7981da177e4SLinus Torvalds .get_sb = rpc_get_sb, 7991da177e4SLinus Torvalds .kill_sb = kill_litter_super, 8001da177e4SLinus Torvalds }; 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds static void 8031da177e4SLinus Torvalds init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 8081da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) { 8091da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 8101da177e4SLinus Torvalds rpci->private = NULL; 8111da177e4SLinus Torvalds rpci->nreaders = 0; 8121da177e4SLinus Torvalds rpci->nwriters = 0; 8131da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->in_upcall); 8141da177e4SLinus Torvalds INIT_LIST_HEAD(&rpci->pipe); 8151da177e4SLinus Torvalds rpci->pipelen = 0; 8161da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 8171da177e4SLinus Torvalds INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); 8181da177e4SLinus Torvalds rpci->ops = NULL; 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds } 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds int register_rpc_pipefs(void) 8231da177e4SLinus Torvalds { 8241da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 8251da177e4SLinus Torvalds sizeof(struct rpc_inode), 8261da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 8271da177e4SLinus Torvalds init_once, NULL); 8281da177e4SLinus Torvalds if (!rpc_inode_cachep) 8291da177e4SLinus Torvalds return -ENOMEM; 8301da177e4SLinus Torvalds register_filesystem(&rpc_pipe_fs_type); 8311da177e4SLinus Torvalds return 0; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 8351da177e4SLinus Torvalds { 8361da177e4SLinus Torvalds if (kmem_cache_destroy(rpc_inode_cachep)) 8371da177e4SLinus Torvalds printk(KERN_WARNING "RPC: unable to free inode cache\n"); 8381da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 8391da177e4SLinus Torvalds } 840