11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * net/sunrpc/rpc_pipe.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Userland/kernel interface for rpcauth_gss. 51da177e4SLinus Torvalds * Code shamelessly plagiarized from fs/nfsd/nfsctl.c 6d51fe1beSRolf Eike Beer * and fs/sysfs/inode.c 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/slab.h> 131da177e4SLinus Torvalds #include <linux/string.h> 141da177e4SLinus Torvalds #include <linux/pagemap.h> 151da177e4SLinus Torvalds #include <linux/mount.h> 161da177e4SLinus Torvalds #include <linux/namei.h> 1750e437d5STrond Myklebust #include <linux/fsnotify.h> 181da177e4SLinus Torvalds #include <linux/kernel.h> 192446ab60STrond Myklebust #include <linux/rcupdate.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/ioctls.h> 221da177e4SLinus Torvalds #include <linux/poll.h> 231da177e4SLinus Torvalds #include <linux/wait.h> 241da177e4SLinus Torvalds #include <linux/seq_file.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 271da177e4SLinus Torvalds #include <linux/workqueue.h> 281da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 298854e82dSTrond Myklebust #include <linux/sunrpc/cache.h> 30021c68deSStanislav Kinsbursky #include <linux/nsproxy.h> 312d00131aSStanislav Kinsbursky #include <linux/notifier.h> 32021c68deSStanislav Kinsbursky 33021c68deSStanislav Kinsbursky #include "netns.h" 342d00131aSStanislav Kinsbursky #include "sunrpc.h" 351da177e4SLinus Torvalds 36efc46bf2SStanislav Kinsbursky #define RPCDBG_FACILITY RPCDBG_DEBUG 37efc46bf2SStanislav Kinsbursky 38efc46bf2SStanislav Kinsbursky #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") 39efc46bf2SStanislav Kinsbursky 401da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds 43e18b890bSChristoph Lameter static struct kmem_cache *rpc_inode_cachep __read_mostly; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #define RPC_UPCALL_TIMEOUT (30*HZ) 461da177e4SLinus Torvalds 472d00131aSStanislav Kinsbursky static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); 482d00131aSStanislav Kinsbursky 492d00131aSStanislav Kinsbursky int rpc_pipefs_notifier_register(struct notifier_block *nb) 502d00131aSStanislav Kinsbursky { 512d00131aSStanislav Kinsbursky return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); 522d00131aSStanislav Kinsbursky } 532d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); 542d00131aSStanislav Kinsbursky 552d00131aSStanislav Kinsbursky void rpc_pipefs_notifier_unregister(struct notifier_block *nb) 562d00131aSStanislav Kinsbursky { 572d00131aSStanislav Kinsbursky blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); 582d00131aSStanislav Kinsbursky } 592d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); 602d00131aSStanislav Kinsbursky 61591ad7feSStanislav Kinsbursky static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, 629842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *), int err) 63b3eb67a2STrond Myklebust { 64b3eb67a2STrond Myklebust struct rpc_pipe_msg *msg; 65b3eb67a2STrond Myklebust 669842ef35STrond Myklebust if (list_empty(head)) 679842ef35STrond Myklebust return; 689842ef35STrond Myklebust do { 69b3eb67a2STrond Myklebust msg = list_entry(head->next, struct rpc_pipe_msg, list); 705a67657aSTrond Myklebust list_del_init(&msg->list); 71b3eb67a2STrond Myklebust msg->errno = err; 72b3eb67a2STrond Myklebust destroy_msg(msg); 739842ef35STrond Myklebust } while (!list_empty(head)); 74591ad7feSStanislav Kinsbursky wake_up(waitq); 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds static void 7865f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 791da177e4SLinus Torvalds { 809842ef35STrond Myklebust LIST_HEAD(free_list); 81ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = 82ba9e0975SStanislav Kinsbursky container_of(work, struct rpc_pipe, queue_timeout.work); 839842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 84591ad7feSStanislav Kinsbursky struct dentry *dentry; 851da177e4SLinus Torvalds 86ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 87ba9e0975SStanislav Kinsbursky destroy_msg = pipe->ops->destroy_msg; 88ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 89ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 90ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 919842ef35STrond Myklebust } 92591ad7feSStanislav Kinsbursky dentry = dget(pipe->dentry); 93ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 94591ad7feSStanislav Kinsbursky if (dentry) { 95591ad7feSStanislav Kinsbursky rpc_purge_list(&RPC_I(dentry->d_inode)->waitq, 96591ad7feSStanislav Kinsbursky &free_list, destroy_msg, -ETIMEDOUT); 97591ad7feSStanislav Kinsbursky dput(dentry); 98591ad7feSStanislav Kinsbursky } 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 101c1225158SPeng Tao ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, 102c1225158SPeng Tao char __user *dst, size_t buflen) 103c1225158SPeng Tao { 104c1225158SPeng Tao char *data = (char *)msg->data + msg->copied; 105c1225158SPeng Tao size_t mlen = min(msg->len - msg->copied, buflen); 106c1225158SPeng Tao unsigned long left; 107c1225158SPeng Tao 108c1225158SPeng Tao left = copy_to_user(dst, data, mlen); 109c1225158SPeng Tao if (left == mlen) { 110c1225158SPeng Tao msg->errno = -EFAULT; 111c1225158SPeng Tao return -EFAULT; 112c1225158SPeng Tao } 113c1225158SPeng Tao 114c1225158SPeng Tao mlen -= left; 115c1225158SPeng Tao msg->copied += mlen; 116c1225158SPeng Tao msg->errno = 0; 117c1225158SPeng Tao return mlen; 118c1225158SPeng Tao } 119c1225158SPeng Tao EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 120c1225158SPeng Tao 12193a44a75SJ. Bruce Fields /** 1221a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 12393a44a75SJ. Bruce Fields * @inode: inode of upcall pipe on which to queue given message 12493a44a75SJ. Bruce Fields * @msg: message to queue 12593a44a75SJ. Bruce Fields * 12693a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 12793a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 12893a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 12993a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 13093a44a75SJ. Bruce Fields */ 1311da177e4SLinus Torvalds int 132d706ed1fSStanislav Kinsbursky rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) 1331da177e4SLinus Torvalds { 1346070fe6fSTrond Myklebust int res = -EPIPE; 135591ad7feSStanislav Kinsbursky struct dentry *dentry; 1361da177e4SLinus Torvalds 137d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 138d0fe13baSStanislav Kinsbursky if (pipe->nreaders) { 139d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 140d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1416070fe6fSTrond Myklebust res = 0; 142d0fe13baSStanislav Kinsbursky } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { 143d0fe13baSStanislav Kinsbursky if (list_empty(&pipe->pipe)) 14424c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 145d0fe13baSStanislav Kinsbursky &pipe->queue_timeout, 1461da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 147d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 148d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1496070fe6fSTrond Myklebust res = 0; 1506070fe6fSTrond Myklebust } 151591ad7feSStanislav Kinsbursky dentry = dget(pipe->dentry); 152d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 153591ad7feSStanislav Kinsbursky if (dentry) { 154591ad7feSStanislav Kinsbursky wake_up(&RPC_I(dentry->d_inode)->waitq); 155591ad7feSStanislav Kinsbursky dput(dentry); 156591ad7feSStanislav Kinsbursky } 1571da177e4SLinus Torvalds return res; 1581da177e4SLinus Torvalds } 159468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1601da177e4SLinus Torvalds 1616070fe6fSTrond Myklebust static inline void 1626070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1636070fe6fSTrond Myklebust { 1646070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1656070fe6fSTrond Myklebust } 1666070fe6fSTrond Myklebust 1671da177e4SLinus Torvalds static void 1681da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1691da177e4SLinus Torvalds { 170ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 171e712804aS\"J. Bruce Fields\ int need_release; 172ad6b1340SStanislav Kinsbursky LIST_HEAD(free_list); 1731da177e4SLinus Torvalds 1741b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 175ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 176ba9e0975SStanislav Kinsbursky need_release = pipe->nreaders != 0 || pipe->nwriters != 0; 177ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 178ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->in_upcall, &free_list); 179ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 180ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 181ad6b1340SStanislav Kinsbursky pipe->dentry = NULL; 182ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 183591ad7feSStanislav Kinsbursky rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); 184ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 185ad6b1340SStanislav Kinsbursky if (need_release && pipe->ops->release_pipe) 186ad6b1340SStanislav Kinsbursky pipe->ops->release_pipe(inode); 187ba9e0975SStanislav Kinsbursky cancel_delayed_work_sync(&pipe->queue_timeout); 1886070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1892c9030eeSStanislav Kinsbursky RPC_I(inode)->pipe = NULL; 1901b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds static struct inode * 1941da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1951da177e4SLinus Torvalds { 1961da177e4SLinus Torvalds struct rpc_inode *rpci; 197e94b1766SChristoph Lameter rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); 1981da177e4SLinus Torvalds if (!rpci) 1991da177e4SLinus Torvalds return NULL; 2001da177e4SLinus Torvalds return &rpci->vfs_inode; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds static void 204fa0d7e3dSNick Piggin rpc_i_callback(struct rcu_head *head) 205fa0d7e3dSNick Piggin { 206fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 207fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 208fa0d7e3dSNick Piggin } 209fa0d7e3dSNick Piggin 210fa0d7e3dSNick Piggin static void 2111da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 2121da177e4SLinus Torvalds { 213fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, rpc_i_callback); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds static int 2171da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 2181da177e4SLinus Torvalds { 2192c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 220c3810608S\"J. Bruce Fields\ int first_open; 2211da177e4SLinus Torvalds int res = -ENXIO; 2221da177e4SLinus Torvalds 2231b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2242c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2252c9030eeSStanislav Kinsbursky if (pipe == NULL) 226c3810608S\"J. Bruce Fields\ goto out; 227d0fe13baSStanislav Kinsbursky first_open = pipe->nreaders == 0 && pipe->nwriters == 0; 228d0fe13baSStanislav Kinsbursky if (first_open && pipe->ops->open_pipe) { 229d0fe13baSStanislav Kinsbursky res = pipe->ops->open_pipe(inode); 230c3810608S\"J. Bruce Fields\ if (res) 231c3810608S\"J. Bruce Fields\ goto out; 232c3810608S\"J. Bruce Fields\ } 2331da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 234d0fe13baSStanislav Kinsbursky pipe->nreaders++; 2351da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 236d0fe13baSStanislav Kinsbursky pipe->nwriters++; 2371da177e4SLinus Torvalds res = 0; 238c3810608S\"J. Bruce Fields\ out: 2391b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2401da177e4SLinus Torvalds return res; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static int 2441da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2451da177e4SLinus Torvalds { 2462c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 2471da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 248e712804aS\"J. Bruce Fields\ int last_close; 2491da177e4SLinus Torvalds 2501b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2512c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2522c9030eeSStanislav Kinsbursky if (pipe == NULL) 2531da177e4SLinus Torvalds goto out; 254655b5bb4SJoe Perches msg = filp->private_data; 2551da177e4SLinus Torvalds if (msg != NULL) { 256ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 25748e49187STrond Myklebust msg->errno = -EAGAIN; 2585a67657aSTrond Myklebust list_del_init(&msg->list); 259ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 260ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg(msg); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 263ba9e0975SStanislav Kinsbursky pipe->nwriters --; 2649842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 265ba9e0975SStanislav Kinsbursky pipe->nreaders --; 266ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 2679842ef35STrond Myklebust LIST_HEAD(free_list); 268ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 269ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 270ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 271ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 272591ad7feSStanislav Kinsbursky rpc_purge_list(&RPC_I(inode)->waitq, &free_list, 273ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg, -EAGAIN); 2749842ef35STrond Myklebust } 2759842ef35STrond Myklebust } 276ba9e0975SStanislav Kinsbursky last_close = pipe->nwriters == 0 && pipe->nreaders == 0; 277ba9e0975SStanislav Kinsbursky if (last_close && pipe->ops->release_pipe) 278ba9e0975SStanislav Kinsbursky pipe->ops->release_pipe(inode); 2791da177e4SLinus Torvalds out: 2801b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2811da177e4SLinus Torvalds return 0; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds static ssize_t 2851da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2861da177e4SLinus Torvalds { 287303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2882c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 2891da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2901da177e4SLinus Torvalds int res = 0; 2911da177e4SLinus Torvalds 2921b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 2932c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 2942c9030eeSStanislav Kinsbursky if (pipe == NULL) { 2951da177e4SLinus Torvalds res = -EPIPE; 2961da177e4SLinus Torvalds goto out_unlock; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds msg = filp->private_data; 2991da177e4SLinus Torvalds if (msg == NULL) { 300d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 301d0fe13baSStanislav Kinsbursky if (!list_empty(&pipe->pipe)) { 302d0fe13baSStanislav Kinsbursky msg = list_entry(pipe->pipe.next, 3031da177e4SLinus Torvalds struct rpc_pipe_msg, 3041da177e4SLinus Torvalds list); 305d0fe13baSStanislav Kinsbursky list_move(&msg->list, &pipe->in_upcall); 306d0fe13baSStanislav Kinsbursky pipe->pipelen -= msg->len; 3071da177e4SLinus Torvalds filp->private_data = msg; 3081da177e4SLinus Torvalds msg->copied = 0; 3091da177e4SLinus Torvalds } 310d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3111da177e4SLinus Torvalds if (msg == NULL) 3121da177e4SLinus Torvalds goto out_unlock; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 315d0fe13baSStanislav Kinsbursky res = pipe->ops->upcall(filp, msg, buf, len); 3161da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 3171da177e4SLinus Torvalds filp->private_data = NULL; 318d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 3195a67657aSTrond Myklebust list_del_init(&msg->list); 320d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 321d0fe13baSStanislav Kinsbursky pipe->ops->destroy_msg(msg); 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds out_unlock: 3241b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3251da177e4SLinus Torvalds return res; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static ssize_t 3291da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 3301da177e4SLinus Torvalds { 331303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 3321da177e4SLinus Torvalds int res; 3331da177e4SLinus Torvalds 3341b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3351da177e4SLinus Torvalds res = -EPIPE; 3362c9030eeSStanislav Kinsbursky if (RPC_I(inode)->pipe != NULL) 3372c9030eeSStanislav Kinsbursky res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); 3381b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3391da177e4SLinus Torvalds return res; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds static unsigned int 3431da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3441da177e4SLinus Torvalds { 345591ad7feSStanislav Kinsbursky struct inode *inode = filp->f_path.dentry->d_inode; 346591ad7feSStanislav Kinsbursky struct rpc_inode *rpci = RPC_I(inode); 347591ad7feSStanislav Kinsbursky unsigned int mask = POLLOUT | POLLWRNORM; 3481da177e4SLinus Torvalds 349591ad7feSStanislav Kinsbursky poll_wait(filp, &rpci->waitq, wait); 3501da177e4SLinus Torvalds 351591ad7feSStanislav Kinsbursky mutex_lock(&inode->i_mutex); 352591ad7feSStanislav Kinsbursky if (rpci->pipe == NULL) 3531da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 354591ad7feSStanislav Kinsbursky else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) 3551da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 356591ad7feSStanislav Kinsbursky mutex_unlock(&inode->i_mutex); 3571da177e4SLinus Torvalds return mask; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 360a6f8dbc6SArnd Bergmann static long 361a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3621da177e4SLinus Torvalds { 363a6f8dbc6SArnd Bergmann struct inode *inode = filp->f_path.dentry->d_inode; 3642c9030eeSStanislav Kinsbursky struct rpc_pipe *pipe; 3651da177e4SLinus Torvalds int len; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds switch (cmd) { 3681da177e4SLinus Torvalds case FIONREAD: 3692c9030eeSStanislav Kinsbursky mutex_lock(&inode->i_mutex); 3702c9030eeSStanislav Kinsbursky pipe = RPC_I(inode)->pipe; 3712c9030eeSStanislav Kinsbursky if (pipe == NULL) { 3722c9030eeSStanislav Kinsbursky mutex_unlock(&inode->i_mutex); 3731da177e4SLinus Torvalds return -EPIPE; 374a6f8dbc6SArnd Bergmann } 3752c9030eeSStanislav Kinsbursky spin_lock(&pipe->lock); 376d0fe13baSStanislav Kinsbursky len = pipe->pipelen; 3771da177e4SLinus Torvalds if (filp->private_data) { 3781da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 379655b5bb4SJoe Perches msg = filp->private_data; 3801da177e4SLinus Torvalds len += msg->len - msg->copied; 3811da177e4SLinus Torvalds } 382d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3832c9030eeSStanislav Kinsbursky mutex_unlock(&inode->i_mutex); 3841da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3851da177e4SLinus Torvalds default: 3861da177e4SLinus Torvalds return -EINVAL; 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 390da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3911da177e4SLinus Torvalds .owner = THIS_MODULE, 3921da177e4SLinus Torvalds .llseek = no_llseek, 3931da177e4SLinus Torvalds .read = rpc_pipe_read, 3941da177e4SLinus Torvalds .write = rpc_pipe_write, 3951da177e4SLinus Torvalds .poll = rpc_pipe_poll, 396674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3971da177e4SLinus Torvalds .open = rpc_pipe_open, 3981da177e4SLinus Torvalds .release = rpc_pipe_release, 3991da177e4SLinus Torvalds }; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds static int 4021da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 4051da177e4SLinus Torvalds 4062446ab60STrond Myklebust rcu_read_lock(); 4074e0038b6STrond Myklebust seq_printf(m, "RPC server: %s\n", 4084e0038b6STrond Myklebust rcu_dereference(clnt->cl_xprt)->servername); 4091da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 4101da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 411e7f78657SChuck Lever seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 412e7f78657SChuck Lever seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); 413bf19aaceSJ. Bruce Fields seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); 4142446ab60STrond Myklebust rcu_read_unlock(); 4151da177e4SLinus Torvalds return 0; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds static int 4191da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 4201da177e4SLinus Torvalds { 421006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 4221da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds if (!ret) { 4251da177e4SLinus Torvalds struct seq_file *m = file->private_data; 426006abe88STrond Myklebust 427006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 428006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 4291da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 430006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 431006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4321da177e4SLinus Torvalds m->private = clnt; 4331da177e4SLinus Torvalds } else { 434006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4351da177e4SLinus Torvalds single_release(inode, file); 4361da177e4SLinus Torvalds ret = -EINVAL; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds return ret; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds static int 4431da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds struct seq_file *m = file->private_data; 4461da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds if (clnt) 4491da177e4SLinus Torvalds rpc_release_client(clnt); 4501da177e4SLinus Torvalds return single_release(inode, file); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 453da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4541da177e4SLinus Torvalds .owner = THIS_MODULE, 4551da177e4SLinus Torvalds .open = rpc_info_open, 4561da177e4SLinus Torvalds .read = seq_read, 4571da177e4SLinus Torvalds .llseek = seq_lseek, 4581da177e4SLinus Torvalds .release = rpc_info_release, 4591da177e4SLinus Torvalds }; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * Description of fs contents. 4641da177e4SLinus Torvalds */ 4651da177e4SLinus Torvalds struct rpc_filelist { 466ac6feceeSTrond Myklebust const char *name; 46799ac48f5SArjan van de Ven const struct file_operations *i_fop; 4687364af6aSTrond Myklebust umode_t mode; 4691da177e4SLinus Torvalds }; 4701da177e4SLinus Torvalds 471fe15ce44SNick Piggin static int rpc_delete_dentry(const struct dentry *dentry) 47262e1761cSTrond Myklebust { 47362e1761cSTrond Myklebust return 1; 47462e1761cSTrond Myklebust } 47562e1761cSTrond Myklebust 4763ba13d17SAl Viro static const struct dentry_operations rpc_dentry_operations = { 47762e1761cSTrond Myklebust .d_delete = rpc_delete_dentry, 47862e1761cSTrond Myklebust }; 47962e1761cSTrond Myklebust 4801da177e4SLinus Torvalds static struct inode * 4817364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4821da177e4SLinus Torvalds { 4831da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4841da177e4SLinus Torvalds if (!inode) 4851da177e4SLinus Torvalds return NULL; 48685fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4871da177e4SLinus Torvalds inode->i_mode = mode; 4881da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4891da177e4SLinus Torvalds switch (mode & S_IFMT) { 4901da177e4SLinus Torvalds case S_IFDIR: 4911da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4921da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 493d8c76e6fSDave Hansen inc_nlink(inode); 4941da177e4SLinus Torvalds default: 4951da177e4SLinus Torvalds break; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds return inode; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5007589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 5017589806eSTrond Myklebust umode_t mode, 5027589806eSTrond Myklebust const struct file_operations *i_fop, 5037589806eSTrond Myklebust void *private) 5047589806eSTrond Myklebust { 5057589806eSTrond Myklebust struct inode *inode; 5067589806eSTrond Myklebust 507beb0f0a9STrond Myklebust d_drop(dentry); 5087589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 5097589806eSTrond Myklebust if (!inode) 5107589806eSTrond Myklebust goto out_err; 5117589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 5127589806eSTrond Myklebust if (i_fop) 5137589806eSTrond Myklebust inode->i_fop = i_fop; 5147589806eSTrond Myklebust if (private) 5157589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5167589806eSTrond Myklebust d_add(dentry, inode); 5177589806eSTrond Myklebust return 0; 5187589806eSTrond Myklebust out_err: 5197589806eSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 5207589806eSTrond Myklebust __FILE__, __func__, dentry->d_name.name); 5217589806eSTrond Myklebust dput(dentry); 5227589806eSTrond Myklebust return -ENOMEM; 5237589806eSTrond Myklebust } 5247589806eSTrond Myklebust 525ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 526ac6feceeSTrond Myklebust umode_t mode, 527ac6feceeSTrond Myklebust const struct file_operations *i_fop, 528ac6feceeSTrond Myklebust void *private) 529ac6feceeSTrond Myklebust { 530ac6feceeSTrond Myklebust int err; 531ac6feceeSTrond Myklebust 532ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 533ac6feceeSTrond Myklebust if (err) 534ac6feceeSTrond Myklebust return err; 535ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 536ac6feceeSTrond Myklebust return 0; 537ac6feceeSTrond Myklebust } 538ac6feceeSTrond Myklebust 5397589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5407589806eSTrond Myklebust umode_t mode, 5417589806eSTrond Myklebust const struct file_operations *i_fop, 5427589806eSTrond Myklebust void *private) 5437589806eSTrond Myklebust { 5447589806eSTrond Myklebust int err; 5457589806eSTrond Myklebust 5467589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5477589806eSTrond Myklebust if (err) 5487589806eSTrond Myklebust return err; 5497589806eSTrond Myklebust inc_nlink(dir); 5507589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5517589806eSTrond Myklebust return 0; 5527589806eSTrond Myklebust } 5537589806eSTrond Myklebust 554ba9e0975SStanislav Kinsbursky static void 555ba9e0975SStanislav Kinsbursky init_pipe(struct rpc_pipe *pipe) 556ba9e0975SStanislav Kinsbursky { 557ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 558ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 559ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_upcall); 560ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_downcall); 561ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->pipe); 562ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 563ba9e0975SStanislav Kinsbursky INIT_DELAYED_WORK(&pipe->queue_timeout, 564ba9e0975SStanislav Kinsbursky rpc_timeout_upcall_queue); 565ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 566ba9e0975SStanislav Kinsbursky spin_lock_init(&pipe->lock); 567c239d83bSStanislav Kinsbursky pipe->dentry = NULL; 568ba9e0975SStanislav Kinsbursky } 569ba9e0975SStanislav Kinsbursky 570c239d83bSStanislav Kinsbursky void rpc_destroy_pipe_data(struct rpc_pipe *pipe) 571c239d83bSStanislav Kinsbursky { 572c239d83bSStanislav Kinsbursky kfree(pipe); 573c239d83bSStanislav Kinsbursky } 574c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); 575c239d83bSStanislav Kinsbursky 576c239d83bSStanislav Kinsbursky struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) 5777589806eSTrond Myklebust { 578ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe; 5797589806eSTrond Myklebust 580ba9e0975SStanislav Kinsbursky pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); 581ba9e0975SStanislav Kinsbursky if (!pipe) 582c239d83bSStanislav Kinsbursky return ERR_PTR(-ENOMEM); 583ba9e0975SStanislav Kinsbursky init_pipe(pipe); 584c239d83bSStanislav Kinsbursky pipe->ops = ops; 585c239d83bSStanislav Kinsbursky pipe->flags = flags; 586c239d83bSStanislav Kinsbursky return pipe; 587ba9e0975SStanislav Kinsbursky } 588c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_data); 589c239d83bSStanislav Kinsbursky 590c239d83bSStanislav Kinsbursky static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, 591c239d83bSStanislav Kinsbursky umode_t mode, 592c239d83bSStanislav Kinsbursky const struct file_operations *i_fop, 593c239d83bSStanislav Kinsbursky void *private, 594c239d83bSStanislav Kinsbursky struct rpc_pipe *pipe) 595c239d83bSStanislav Kinsbursky { 596c239d83bSStanislav Kinsbursky struct rpc_inode *rpci; 597c239d83bSStanislav Kinsbursky int err; 598c239d83bSStanislav Kinsbursky 599c239d83bSStanislav Kinsbursky err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 600c239d83bSStanislav Kinsbursky if (err) 601c239d83bSStanislav Kinsbursky return err; 6027589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 6037589806eSTrond Myklebust rpci->private = private; 604ba9e0975SStanislav Kinsbursky rpci->pipe = pipe; 6057589806eSTrond Myklebust fsnotify_create(dir, dentry); 6067589806eSTrond Myklebust return 0; 6077589806eSTrond Myklebust } 6087589806eSTrond Myklebust 609ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 610ac6feceeSTrond Myklebust { 611ac6feceeSTrond Myklebust int ret; 612ac6feceeSTrond Myklebust 613ac6feceeSTrond Myklebust dget(dentry); 614ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 615ac6feceeSTrond Myklebust d_delete(dentry); 616ac6feceeSTrond Myklebust dput(dentry); 617ac6feceeSTrond Myklebust return ret; 618ac6feceeSTrond Myklebust } 619ac6feceeSTrond Myklebust 620eee17325SStanislav Kinsbursky int rpc_rmdir(struct dentry *dentry) 621eee17325SStanislav Kinsbursky { 622eee17325SStanislav Kinsbursky struct dentry *parent; 623eee17325SStanislav Kinsbursky struct inode *dir; 624eee17325SStanislav Kinsbursky int error; 625eee17325SStanislav Kinsbursky 626eee17325SStanislav Kinsbursky parent = dget_parent(dentry); 627eee17325SStanislav Kinsbursky dir = parent->d_inode; 628eee17325SStanislav Kinsbursky mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 629eee17325SStanislav Kinsbursky error = __rpc_rmdir(dir, dentry); 630eee17325SStanislav Kinsbursky mutex_unlock(&dir->i_mutex); 631eee17325SStanislav Kinsbursky dput(parent); 632eee17325SStanislav Kinsbursky return error; 633eee17325SStanislav Kinsbursky } 634eee17325SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_rmdir); 635eee17325SStanislav Kinsbursky 636810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 637810d90bcSTrond Myklebust { 638810d90bcSTrond Myklebust int ret; 639810d90bcSTrond Myklebust 640810d90bcSTrond Myklebust dget(dentry); 641810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 642810d90bcSTrond Myklebust d_delete(dentry); 643810d90bcSTrond Myklebust dput(dentry); 644810d90bcSTrond Myklebust return ret; 645810d90bcSTrond Myklebust } 646810d90bcSTrond Myklebust 647810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 648810d90bcSTrond Myklebust { 649810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 650810d90bcSTrond Myklebust 651810d90bcSTrond Myklebust rpc_close_pipes(inode); 652810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 653810d90bcSTrond Myklebust } 654810d90bcSTrond Myklebust 655cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 656cfeaa4a3STrond Myklebust struct qstr *name) 657cfeaa4a3STrond Myklebust { 658cfeaa4a3STrond Myklebust struct dentry *dentry; 659cfeaa4a3STrond Myklebust 6605bff0386SStanislav Kinsbursky dentry = d_lookup(parent, name); 6615bff0386SStanislav Kinsbursky if (!dentry) { 6625bff0386SStanislav Kinsbursky dentry = d_alloc(parent, name); 6635bff0386SStanislav Kinsbursky if (!dentry) 6645bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6655bff0386SStanislav Kinsbursky } 6665bff0386SStanislav Kinsbursky if (dentry->d_inode == NULL) { 6675bff0386SStanislav Kinsbursky d_set_d_op(dentry, &rpc_dentry_operations); 668f1f0abe1SDan Carpenter return dentry; 6695bff0386SStanislav Kinsbursky } 670cfeaa4a3STrond Myklebust dput(dentry); 671cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 672cfeaa4a3STrond Myklebust } 673cfeaa4a3STrond Myklebust 6741da177e4SLinus Torvalds /* 6751da177e4SLinus Torvalds * FIXME: This probably has races. 6761da177e4SLinus Torvalds */ 677ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 678ac6feceeSTrond Myklebust const struct rpc_filelist *files, 679ac6feceeSTrond Myklebust int start, int eof) 6801da177e4SLinus Torvalds { 6811da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 682ac6feceeSTrond Myklebust struct dentry *dentry; 683ac6feceeSTrond Myklebust struct qstr name; 684ac6feceeSTrond Myklebust int i; 685ac6feceeSTrond Myklebust 686ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 687ac6feceeSTrond Myklebust name.name = files[i].name; 688ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 689ac6feceeSTrond Myklebust name.hash = full_name_hash(name.name, name.len); 690ac6feceeSTrond Myklebust dentry = d_lookup(parent, &name); 691ac6feceeSTrond Myklebust 692ac6feceeSTrond Myklebust if (dentry == NULL) 693ac6feceeSTrond Myklebust continue; 694ac6feceeSTrond Myklebust if (dentry->d_inode == NULL) 695ac6feceeSTrond Myklebust goto next; 696ac6feceeSTrond Myklebust switch (dentry->d_inode->i_mode & S_IFMT) { 697ac6feceeSTrond Myklebust default: 698ac6feceeSTrond Myklebust BUG(); 699ac6feceeSTrond Myklebust case S_IFREG: 700ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 701ac6feceeSTrond Myklebust break; 702ac6feceeSTrond Myklebust case S_IFDIR: 703ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 704ac6feceeSTrond Myklebust } 705ac6feceeSTrond Myklebust next: 706ac6feceeSTrond Myklebust dput(dentry); 707ac6feceeSTrond Myklebust } 708ac6feceeSTrond Myklebust } 709ac6feceeSTrond Myklebust 710ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 711ac6feceeSTrond Myklebust const struct rpc_filelist *files, 712ac6feceeSTrond Myklebust int start, int eof) 713ac6feceeSTrond Myklebust { 714ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7151da177e4SLinus Torvalds 716c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); 717ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7181b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds 721ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 722ac6feceeSTrond Myklebust const struct rpc_filelist *files, 723ac6feceeSTrond Myklebust int start, int eof, 724ac6feceeSTrond Myklebust void *private) 7251da177e4SLinus Torvalds { 726ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7271da177e4SLinus Torvalds struct dentry *dentry; 728ac6feceeSTrond Myklebust int i, err; 7291da177e4SLinus Torvalds 7301b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 7311da177e4SLinus Torvalds for (i = start; i < eof; i++) { 732ac6feceeSTrond Myklebust struct qstr q; 733ac6feceeSTrond Myklebust 734ac6feceeSTrond Myklebust q.name = files[i].name; 735ac6feceeSTrond Myklebust q.len = strlen(files[i].name); 736ac6feceeSTrond Myklebust q.hash = full_name_hash(q.name, q.len); 737ac6feceeSTrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, &q); 738ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 739ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 7401da177e4SLinus Torvalds goto out_bad; 741ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 742ac6feceeSTrond Myklebust default: 743ac6feceeSTrond Myklebust BUG(); 744ac6feceeSTrond Myklebust case S_IFREG: 745ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 746ac6feceeSTrond Myklebust files[i].mode, 747ac6feceeSTrond Myklebust files[i].i_fop, 748ac6feceeSTrond Myklebust private); 749ac6feceeSTrond Myklebust break; 750ac6feceeSTrond Myklebust case S_IFDIR: 751ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 752ac6feceeSTrond Myklebust files[i].mode, 753ac6feceeSTrond Myklebust NULL, 754ac6feceeSTrond Myklebust private); 7551da177e4SLinus Torvalds } 756ac6feceeSTrond Myklebust if (err != 0) 757ac6feceeSTrond Myklebust goto out_bad; 7581da177e4SLinus Torvalds } 7591b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7601da177e4SLinus Torvalds return 0; 7611da177e4SLinus Torvalds out_bad: 762ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7631b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7641da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 7650dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name); 766ac6feceeSTrond Myklebust return err; 767f134585aSTrond Myklebust } 768f134585aSTrond Myklebust 769e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 770e57aed77STrond Myklebust struct qstr *name, umode_t mode, void *private, 771e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 772f134585aSTrond Myklebust { 773f134585aSTrond Myklebust struct dentry *dentry; 7747d59d1e8STrond Myklebust struct inode *dir = parent->d_inode; 775f134585aSTrond Myklebust int error; 776f134585aSTrond Myklebust 7777d59d1e8STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 7787d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 779f134585aSTrond Myklebust if (IS_ERR(dentry)) 7807d59d1e8STrond Myklebust goto out; 7817d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7827589806eSTrond Myklebust if (error != 0) 7837589806eSTrond Myklebust goto out_err; 784e57aed77STrond Myklebust if (populate != NULL) { 785e57aed77STrond Myklebust error = populate(dentry, args_populate); 786f134585aSTrond Myklebust if (error) 787ac6feceeSTrond Myklebust goto err_rmdir; 788e57aed77STrond Myklebust } 789f134585aSTrond Myklebust out: 7901b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7915c3e985aSTrond Myklebust return dentry; 792ac6feceeSTrond Myklebust err_rmdir: 793f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7947589806eSTrond Myklebust out_err: 795f134585aSTrond Myklebust dentry = ERR_PTR(error); 796f134585aSTrond Myklebust goto out; 797f134585aSTrond Myklebust } 798f134585aSTrond Myklebust 799e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 800e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 801f134585aSTrond Myklebust { 802dff02cc1STrond Myklebust struct dentry *parent; 803f134585aSTrond Myklebust struct inode *dir; 804f134585aSTrond Myklebust int error; 805f134585aSTrond Myklebust 806dff02cc1STrond Myklebust parent = dget_parent(dentry); 807dff02cc1STrond Myklebust dir = parent->d_inode; 808c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 809e57aed77STrond Myklebust if (depopulate != NULL) 810e57aed77STrond Myklebust depopulate(dentry); 811f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 8121b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 813dff02cc1STrond Myklebust dput(parent); 814f134585aSTrond Myklebust return error; 815f134585aSTrond Myklebust } 8161da177e4SLinus Torvalds 81793a44a75SJ. Bruce Fields /** 81893a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 81993a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 82093a44a75SJ. Bruce Fields * @name: name of pipe 82193a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 82293a44a75SJ. Bruce Fields * @ops: operations defining the behavior of the pipe: upcall, downcall, 823c3810608S\"J. Bruce Fields\ * release_pipe, open_pipe, and destroy_msg. 824d0fe13baSStanislav Kinsbursky * @flags: rpc_pipe flags 82593a44a75SJ. Bruce Fields * 82693a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 82793a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 82893a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 82993a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 83093a44a75SJ. Bruce Fields * 83193a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 83293a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 83393a44a75SJ. Bruce Fields * 83493a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 83593a44a75SJ. Bruce Fields * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. 83693a44a75SJ. Bruce Fields */ 837c239d83bSStanislav Kinsbursky struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, 838c239d83bSStanislav Kinsbursky void *private, struct rpc_pipe *pipe) 8391da177e4SLinus Torvalds { 8401da177e4SLinus Torvalds struct dentry *dentry; 8417589806eSTrond Myklebust struct inode *dir = parent->d_inode; 8427364af6aSTrond Myklebust umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; 843cfeaa4a3STrond Myklebust struct qstr q; 8447589806eSTrond Myklebust int err; 8457364af6aSTrond Myklebust 846c239d83bSStanislav Kinsbursky if (pipe->ops->upcall == NULL) 8477364af6aSTrond Myklebust umode &= ~S_IRUGO; 848c239d83bSStanislav Kinsbursky if (pipe->ops->downcall == NULL) 8497364af6aSTrond Myklebust umode &= ~S_IWUGO; 8501da177e4SLinus Torvalds 851cfeaa4a3STrond Myklebust q.name = name; 852cfeaa4a3STrond Myklebust q.len = strlen(name); 853cfeaa4a3STrond Myklebust q.hash = full_name_hash(q.name, q.len), 854cfeaa4a3STrond Myklebust 855cfeaa4a3STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 8565bff0386SStanislav Kinsbursky dentry = __rpc_lookup_create_exclusive(parent, &q); 8571da177e4SLinus Torvalds if (IS_ERR(dentry)) 858cfeaa4a3STrond Myklebust goto out; 859c239d83bSStanislav Kinsbursky err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, 860c239d83bSStanislav Kinsbursky private, pipe); 8617589806eSTrond Myklebust if (err) 8627589806eSTrond Myklebust goto out_err; 863f134585aSTrond Myklebust out: 8641b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8655c3e985aSTrond Myklebust return dentry; 8667589806eSTrond Myklebust out_err: 8677589806eSTrond Myklebust dentry = ERR_PTR(err); 868158998b6STrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", 8690dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name, name, 8707589806eSTrond Myklebust err); 871f134585aSTrond Myklebust goto out; 8721da177e4SLinus Torvalds } 873c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); 8741da177e4SLinus Torvalds 87593a44a75SJ. Bruce Fields /** 87693a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 87793a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 87893a44a75SJ. Bruce Fields * 87993a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 88093a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 88193a44a75SJ. Bruce Fields * return -EPIPE. 88293a44a75SJ. Bruce Fields */ 883f134585aSTrond Myklebust int 8845d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8851da177e4SLinus Torvalds { 8865d67476fSTrond Myklebust struct dentry *parent; 887f134585aSTrond Myklebust struct inode *dir; 8885d67476fSTrond Myklebust int error = 0; 8891da177e4SLinus Torvalds 8905d67476fSTrond Myklebust parent = dget_parent(dentry); 8915d67476fSTrond Myklebust dir = parent->d_inode; 892c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 893810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8941b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8955d67476fSTrond Myklebust dput(parent); 896f134585aSTrond Myklebust return error; 8971da177e4SLinus Torvalds } 898468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8991da177e4SLinus Torvalds 900e57aed77STrond Myklebust enum { 901e57aed77STrond Myklebust RPCAUTH_info, 902e57aed77STrond Myklebust RPCAUTH_EOF 903e57aed77STrond Myklebust }; 904e57aed77STrond Myklebust 905e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 906e57aed77STrond Myklebust [RPCAUTH_info] = { 907e57aed77STrond Myklebust .name = "info", 908e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 909e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 910e57aed77STrond Myklebust }, 911e57aed77STrond Myklebust }; 912e57aed77STrond Myklebust 913e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 914e57aed77STrond Myklebust { 915e57aed77STrond Myklebust return rpc_populate(dentry, 916e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 917e57aed77STrond Myklebust private); 918e57aed77STrond Myklebust } 919e57aed77STrond Myklebust 920e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 921e57aed77STrond Myklebust { 922e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 923e57aed77STrond Myklebust } 924e57aed77STrond Myklebust 9257d59d1e8STrond Myklebust /** 9267d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 9274111d4fdSRandy Dunlap * @dentry: dentry from the rpc_pipefs root to the new directory 9284111d4fdSRandy Dunlap * @name: &struct qstr for the name 9297d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 9307d59d1e8STrond Myklebust * 9317d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 9327d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 9337d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 9347d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 9357d59d1e8STrond Myklebust */ 93623ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 93723ac6581STrond Myklebust struct qstr *name, 9387d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 9397d59d1e8STrond Myklebust { 940e57aed77STrond Myklebust return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 941e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 942e57aed77STrond Myklebust } 943e57aed77STrond Myklebust 944e57aed77STrond Myklebust /** 945e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 94680df9d20SStanislav Kinsbursky * @clnt: rpc client 947e57aed77STrond Myklebust */ 948e57aed77STrond Myklebust int rpc_remove_client_dir(struct dentry *dentry) 949e57aed77STrond Myklebust { 950e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 9517d59d1e8STrond Myklebust } 9527d59d1e8STrond Myklebust 9538854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 9548854e82dSTrond Myklebust [0] = { 9558854e82dSTrond Myklebust .name = "channel", 9568854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 95796c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9588854e82dSTrond Myklebust }, 9598854e82dSTrond Myklebust [1] = { 9608854e82dSTrond Myklebust .name = "content", 9618854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 9628854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 9638854e82dSTrond Myklebust }, 9648854e82dSTrond Myklebust [2] = { 9658854e82dSTrond Myklebust .name = "flush", 9668854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 9678854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9688854e82dSTrond Myklebust }, 9698854e82dSTrond Myklebust }; 9708854e82dSTrond Myklebust 9718854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 9728854e82dSTrond Myklebust { 9738854e82dSTrond Myklebust return rpc_populate(dentry, 9748854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 9758854e82dSTrond Myklebust private); 9768854e82dSTrond Myklebust } 9778854e82dSTrond Myklebust 9788854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 9798854e82dSTrond Myklebust { 9808854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 9818854e82dSTrond Myklebust } 9828854e82dSTrond Myklebust 9838854e82dSTrond Myklebust struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, 98464f1426fSAl Viro umode_t umode, struct cache_detail *cd) 9858854e82dSTrond Myklebust { 9868854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 9878854e82dSTrond Myklebust rpc_cachedir_populate, cd); 9888854e82dSTrond Myklebust } 9898854e82dSTrond Myklebust 9908854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 9918854e82dSTrond Myklebust { 9928854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 9938854e82dSTrond Myklebust } 9948854e82dSTrond Myklebust 9951da177e4SLinus Torvalds /* 9961da177e4SLinus Torvalds * populate the filesystem 9971da177e4SLinus Torvalds */ 998b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 9991da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 10001da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 10011da177e4SLinus Torvalds .statfs = simple_statfs, 10021da177e4SLinus Torvalds }; 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 10051da177e4SLinus Torvalds 1006bb156749STrond Myklebust /* 1007bb156749STrond Myklebust * We have a single directory with 1 node in it. 1008bb156749STrond Myklebust */ 1009bb156749STrond Myklebust enum { 1010bb156749STrond Myklebust RPCAUTH_lockd, 1011bb156749STrond Myklebust RPCAUTH_mount, 1012bb156749STrond Myklebust RPCAUTH_nfs, 1013bb156749STrond Myklebust RPCAUTH_portmap, 1014bb156749STrond Myklebust RPCAUTH_statd, 1015bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 1016e571cbf1STrond Myklebust RPCAUTH_cache, 1017bb156749STrond Myklebust RPCAUTH_RootEOF 1018bb156749STrond Myklebust }; 1019bb156749STrond Myklebust 1020bb156749STrond Myklebust static const struct rpc_filelist files[] = { 1021bb156749STrond Myklebust [RPCAUTH_lockd] = { 1022bb156749STrond Myklebust .name = "lockd", 1023bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1024bb156749STrond Myklebust }, 1025bb156749STrond Myklebust [RPCAUTH_mount] = { 1026bb156749STrond Myklebust .name = "mount", 1027bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1028bb156749STrond Myklebust }, 1029bb156749STrond Myklebust [RPCAUTH_nfs] = { 1030bb156749STrond Myklebust .name = "nfs", 1031bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1032bb156749STrond Myklebust }, 1033bb156749STrond Myklebust [RPCAUTH_portmap] = { 1034bb156749STrond Myklebust .name = "portmap", 1035bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1036bb156749STrond Myklebust }, 1037bb156749STrond Myklebust [RPCAUTH_statd] = { 1038bb156749STrond Myklebust .name = "statd", 1039bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1040bb156749STrond Myklebust }, 1041bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 1042bb156749STrond Myklebust .name = "nfsd4_cb", 1043bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1044bb156749STrond Myklebust }, 1045e571cbf1STrond Myklebust [RPCAUTH_cache] = { 1046e571cbf1STrond Myklebust .name = "cache", 1047e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1048e571cbf1STrond Myklebust }, 1049bb156749STrond Myklebust }; 1050bb156749STrond Myklebust 1051432eb1a5SStanislav Kinsbursky /* 1052432eb1a5SStanislav Kinsbursky * This call can be used only in RPC pipefs mount notification hooks. 1053432eb1a5SStanislav Kinsbursky */ 1054432eb1a5SStanislav Kinsbursky struct dentry *rpc_d_lookup_sb(const struct super_block *sb, 1055432eb1a5SStanislav Kinsbursky const unsigned char *dir_name) 1056432eb1a5SStanislav Kinsbursky { 1057432eb1a5SStanislav Kinsbursky struct qstr dir = { 1058432eb1a5SStanislav Kinsbursky .name = dir_name, 1059432eb1a5SStanislav Kinsbursky .len = strlen(dir_name), 1060432eb1a5SStanislav Kinsbursky .hash = full_name_hash(dir_name, strlen(dir_name)), 1061432eb1a5SStanislav Kinsbursky }; 1062432eb1a5SStanislav Kinsbursky 1063432eb1a5SStanislav Kinsbursky return d_lookup(sb->s_root, &dir); 1064432eb1a5SStanislav Kinsbursky } 1065432eb1a5SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 1066432eb1a5SStanislav Kinsbursky 1067c21a588fSStanislav Kinsbursky void rpc_pipefs_init_net(struct net *net) 1068c21a588fSStanislav Kinsbursky { 1069c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1070c21a588fSStanislav Kinsbursky 1071c21a588fSStanislav Kinsbursky mutex_init(&sn->pipefs_sb_lock); 1072c21a588fSStanislav Kinsbursky } 1073c21a588fSStanislav Kinsbursky 1074c21a588fSStanislav Kinsbursky /* 1075c21a588fSStanislav Kinsbursky * This call will be used for per network namespace operations calls. 1076c21a588fSStanislav Kinsbursky * Note: Function will be returned with pipefs_sb_lock taken if superblock was 1077c21a588fSStanislav Kinsbursky * found. This lock have to be released by rpc_put_sb_net() when all operations 1078c21a588fSStanislav Kinsbursky * will be completed. 1079c21a588fSStanislav Kinsbursky */ 1080c21a588fSStanislav Kinsbursky struct super_block *rpc_get_sb_net(const struct net *net) 1081c21a588fSStanislav Kinsbursky { 1082c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1083c21a588fSStanislav Kinsbursky 1084c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1085c21a588fSStanislav Kinsbursky if (sn->pipefs_sb) 1086c21a588fSStanislav Kinsbursky return sn->pipefs_sb; 1087c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1088c21a588fSStanislav Kinsbursky return NULL; 1089c21a588fSStanislav Kinsbursky } 1090c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_get_sb_net); 1091c21a588fSStanislav Kinsbursky 1092c21a588fSStanislav Kinsbursky void rpc_put_sb_net(const struct net *net) 1093c21a588fSStanislav Kinsbursky { 1094c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1095c21a588fSStanislav Kinsbursky 1096c21a588fSStanislav Kinsbursky BUG_ON(sn->pipefs_sb == NULL); 1097c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1098c21a588fSStanislav Kinsbursky } 1099c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_put_sb_net); 1100c21a588fSStanislav Kinsbursky 11011da177e4SLinus Torvalds static int 11021da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 11031da177e4SLinus Torvalds { 11041da177e4SLinus Torvalds struct inode *inode; 11051da177e4SLinus Torvalds struct dentry *root; 110638b0da75SStanislav Kinsbursky struct net *net = data; 110790c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 11082d00131aSStanislav Kinsbursky int err; 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 11111da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 11121da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 11131da177e4SLinus Torvalds sb->s_op = &s_ops; 11141da177e4SLinus Torvalds sb->s_time_gran = 1; 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 11171da177e4SLinus Torvalds if (!inode) 11181da177e4SLinus Torvalds return -ENOMEM; 1119fc7bed8cSAl Viro sb->s_root = root = d_alloc_root(inode); 11201da177e4SLinus Torvalds if (!root) { 11211da177e4SLinus Torvalds iput(inode); 11221da177e4SLinus Torvalds return -ENOMEM; 11231da177e4SLinus Torvalds } 1124ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 11251da177e4SLinus Torvalds return -ENOMEM; 1126efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, 1127efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11282d00131aSStanislav Kinsbursky err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11292d00131aSStanislav Kinsbursky RPC_PIPEFS_MOUNT, 11302d00131aSStanislav Kinsbursky sb); 11312d00131aSStanislav Kinsbursky if (err) 11322d00131aSStanislav Kinsbursky goto err_depopulate; 1133021c68deSStanislav Kinsbursky sb->s_fs_info = get_net(net); 113490c4e829SStanislav Kinsbursky sn->pipefs_sb = sb; 1135fc7bed8cSAl Viro return 0; 11362d00131aSStanislav Kinsbursky 11372d00131aSStanislav Kinsbursky err_depopulate: 11382d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11392d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11402d00131aSStanislav Kinsbursky sb); 11412d00131aSStanislav Kinsbursky __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 11422d00131aSStanislav Kinsbursky return err; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds 1145fc14f2feSAl Viro static struct dentry * 1146fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1147fc14f2feSAl Viro int flags, const char *dev_name, void *data) 11481da177e4SLinus Torvalds { 114938b0da75SStanislav Kinsbursky return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds 1152021c68deSStanislav Kinsbursky void rpc_kill_sb(struct super_block *sb) 1153021c68deSStanislav Kinsbursky { 1154021c68deSStanislav Kinsbursky struct net *net = sb->s_fs_info; 115590c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1156021c68deSStanislav Kinsbursky 1157c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 115890c4e829SStanislav Kinsbursky sn->pipefs_sb = NULL; 1159c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1160021c68deSStanislav Kinsbursky put_net(net); 1161efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, 1162efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11632d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11642d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11652d00131aSStanislav Kinsbursky sb); 1166021c68deSStanislav Kinsbursky kill_litter_super(sb); 1167021c68deSStanislav Kinsbursky } 1168021c68deSStanislav Kinsbursky 11691da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 11701da177e4SLinus Torvalds .owner = THIS_MODULE, 11711da177e4SLinus Torvalds .name = "rpc_pipefs", 1172fc14f2feSAl Viro .mount = rpc_mount, 1173021c68deSStanislav Kinsbursky .kill_sb = rpc_kill_sb, 11741da177e4SLinus Torvalds }; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds static void 117751cc5068SAlexey Dobriyan init_once(void *foo) 11781da177e4SLinus Torvalds { 11791da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 11821da177e4SLinus Torvalds rpci->private = NULL; 1183ba9e0975SStanislav Kinsbursky rpci->pipe = NULL; 1184591ad7feSStanislav Kinsbursky init_waitqueue_head(&rpci->waitq); 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds int register_rpc_pipefs(void) 11881da177e4SLinus Torvalds { 11895bd5f581SAkinobu Mita int err; 11905bd5f581SAkinobu Mita 11911da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 11921da177e4SLinus Torvalds sizeof(struct rpc_inode), 1193fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1194fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 119520c2df83SPaul Mundt init_once); 11961da177e4SLinus Torvalds if (!rpc_inode_cachep) 11971da177e4SLinus Torvalds return -ENOMEM; 119880df9d20SStanislav Kinsbursky err = rpc_clients_notifier_register(); 119980df9d20SStanislav Kinsbursky if (err) 120080df9d20SStanislav Kinsbursky goto err_notifier; 12015bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 120280df9d20SStanislav Kinsbursky if (err) 120380df9d20SStanislav Kinsbursky goto err_register; 120480df9d20SStanislav Kinsbursky return 0; 120580df9d20SStanislav Kinsbursky 120680df9d20SStanislav Kinsbursky err_register: 120780df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 120880df9d20SStanislav Kinsbursky err_notifier: 12095bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 12105bd5f581SAkinobu Mita return err; 12115bd5f581SAkinobu Mita } 12125bd5f581SAkinobu Mita 12131da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 12141da177e4SLinus Torvalds { 121580df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 12161a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 12171da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 12181da177e4SLinus Torvalds } 1219dcbf8c30SMichal Schmidt 1220dcbf8c30SMichal Schmidt /* Make 'mount -t rpc_pipefs ...' autoload this module. */ 1221dcbf8c30SMichal Schmidt MODULE_ALIAS("rpc_pipefs"); 1222