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> 321da177e4SLinus Torvalds 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)" : "") 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 414b9a445eSJeff Layton static const struct rpc_pipe_ops gssd_dummy_pipe_ops; 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)); 7492123e06SJeff Layton 7592123e06SJeff Layton if (waitq) 76591ad7feSStanislav Kinsbursky wake_up(waitq); 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds static void 8065f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 811da177e4SLinus Torvalds { 829842ef35STrond Myklebust LIST_HEAD(free_list); 83ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = 84ba9e0975SStanislav Kinsbursky container_of(work, struct rpc_pipe, queue_timeout.work); 859842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 86591ad7feSStanislav Kinsbursky struct dentry *dentry; 871da177e4SLinus Torvalds 88ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 89ba9e0975SStanislav Kinsbursky destroy_msg = pipe->ops->destroy_msg; 90ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 91ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 92ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 939842ef35STrond Myklebust } 94591ad7feSStanislav Kinsbursky dentry = dget(pipe->dentry); 95ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 9692123e06SJeff Layton rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL, 97591ad7feSStanislav Kinsbursky &free_list, destroy_msg, -ETIMEDOUT); 98591ad7feSStanislav Kinsbursky dput(dentry); 999842ef35STrond Myklebust } 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 123bda14606SRandy Dunlap * @pipe: 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 { 287496ad9aaSAl Viro struct inode *inode = file_inode(filp); 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 { 331496ad9aaSAl Viro struct inode *inode = file_inode(filp); 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 { 345496ad9aaSAl Viro struct inode *inode = file_inode(filp); 346591ad7feSStanislav Kinsbursky struct rpc_inode *rpci = RPC_I(inode); 347591ad7feSStanislav Kinsbursky unsigned int mask = POLLOUT | POLLWRNORM; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds 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 { 363496ad9aaSAl Viro struct inode *inode = file_inode(filp); 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); 40955909f21STrond Myklebust seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, 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 4711da177e4SLinus Torvalds static struct inode * 4727364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4731da177e4SLinus Torvalds { 4741da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4751da177e4SLinus Torvalds if (!inode) 4761da177e4SLinus Torvalds return NULL; 47785fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4781da177e4SLinus Torvalds inode->i_mode = mode; 4791da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4801da177e4SLinus Torvalds switch (mode & S_IFMT) { 4811da177e4SLinus Torvalds case S_IFDIR: 4821da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 483275448ebSJeff Layton inode->i_op = &simple_dir_inode_operations; 484d8c76e6fSDave Hansen inc_nlink(inode); 4851da177e4SLinus Torvalds default: 4861da177e4SLinus Torvalds break; 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds return inode; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4917589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 4927589806eSTrond Myklebust umode_t mode, 4937589806eSTrond Myklebust const struct file_operations *i_fop, 4947589806eSTrond Myklebust void *private) 4957589806eSTrond Myklebust { 4967589806eSTrond Myklebust struct inode *inode; 4977589806eSTrond Myklebust 498beb0f0a9STrond Myklebust d_drop(dentry); 4997589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 5007589806eSTrond Myklebust if (!inode) 5017589806eSTrond Myklebust goto out_err; 5027589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 5037589806eSTrond Myklebust if (i_fop) 5047589806eSTrond Myklebust inode->i_fop = i_fop; 5057589806eSTrond Myklebust if (private) 5067589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5077589806eSTrond Myklebust d_add(dentry, inode); 5087589806eSTrond Myklebust return 0; 5097589806eSTrond Myklebust out_err: 5101e903edaSAl Viro printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", 5111e903edaSAl Viro __FILE__, __func__, dentry); 5127589806eSTrond Myklebust dput(dentry); 5137589806eSTrond Myklebust return -ENOMEM; 5147589806eSTrond Myklebust } 5157589806eSTrond Myklebust 516ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 517ac6feceeSTrond Myklebust umode_t mode, 518ac6feceeSTrond Myklebust const struct file_operations *i_fop, 519ac6feceeSTrond Myklebust void *private) 520ac6feceeSTrond Myklebust { 521ac6feceeSTrond Myklebust int err; 522ac6feceeSTrond Myklebust 523ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 524ac6feceeSTrond Myklebust if (err) 525ac6feceeSTrond Myklebust return err; 526ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 527ac6feceeSTrond Myklebust return 0; 528ac6feceeSTrond Myklebust } 529ac6feceeSTrond Myklebust 5307589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5317589806eSTrond Myklebust umode_t mode, 5327589806eSTrond Myklebust const struct file_operations *i_fop, 5337589806eSTrond Myklebust void *private) 5347589806eSTrond Myklebust { 5357589806eSTrond Myklebust int err; 5367589806eSTrond Myklebust 5377589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5387589806eSTrond Myklebust if (err) 5397589806eSTrond Myklebust return err; 5407589806eSTrond Myklebust inc_nlink(dir); 5417589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5427589806eSTrond Myklebust return 0; 5437589806eSTrond Myklebust } 5447589806eSTrond Myklebust 545ba9e0975SStanislav Kinsbursky static void 546ba9e0975SStanislav Kinsbursky init_pipe(struct rpc_pipe *pipe) 547ba9e0975SStanislav Kinsbursky { 548ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 549ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 550ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_upcall); 551ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_downcall); 552ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->pipe); 553ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 554ba9e0975SStanislav Kinsbursky INIT_DELAYED_WORK(&pipe->queue_timeout, 555ba9e0975SStanislav Kinsbursky rpc_timeout_upcall_queue); 556ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 557ba9e0975SStanislav Kinsbursky spin_lock_init(&pipe->lock); 558c239d83bSStanislav Kinsbursky pipe->dentry = NULL; 559ba9e0975SStanislav Kinsbursky } 560ba9e0975SStanislav Kinsbursky 561c239d83bSStanislav Kinsbursky void rpc_destroy_pipe_data(struct rpc_pipe *pipe) 562c239d83bSStanislav Kinsbursky { 563c239d83bSStanislav Kinsbursky kfree(pipe); 564c239d83bSStanislav Kinsbursky } 565c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); 566c239d83bSStanislav Kinsbursky 567c239d83bSStanislav Kinsbursky struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) 5687589806eSTrond Myklebust { 569ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe; 5707589806eSTrond Myklebust 571ba9e0975SStanislav Kinsbursky pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); 572ba9e0975SStanislav Kinsbursky if (!pipe) 573c239d83bSStanislav Kinsbursky return ERR_PTR(-ENOMEM); 574ba9e0975SStanislav Kinsbursky init_pipe(pipe); 575c239d83bSStanislav Kinsbursky pipe->ops = ops; 576c239d83bSStanislav Kinsbursky pipe->flags = flags; 577c239d83bSStanislav Kinsbursky return pipe; 578ba9e0975SStanislav Kinsbursky } 579c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_data); 580c239d83bSStanislav Kinsbursky 581c239d83bSStanislav Kinsbursky static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, 5827589806eSTrond Myklebust umode_t mode, 5837589806eSTrond Myklebust const struct file_operations *i_fop, 5847589806eSTrond Myklebust void *private, 585c239d83bSStanislav Kinsbursky struct rpc_pipe *pipe) 5867589806eSTrond Myklebust { 5877589806eSTrond Myklebust struct rpc_inode *rpci; 5887589806eSTrond Myklebust int err; 5897589806eSTrond Myklebust 5907589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 5917589806eSTrond Myklebust if (err) 5927589806eSTrond Myklebust return err; 5937589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 5947589806eSTrond Myklebust rpci->private = private; 595ba9e0975SStanislav Kinsbursky rpci->pipe = pipe; 5967589806eSTrond Myklebust fsnotify_create(dir, dentry); 5977589806eSTrond Myklebust return 0; 5987589806eSTrond Myklebust } 5997589806eSTrond Myklebust 600ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 601ac6feceeSTrond Myklebust { 602ac6feceeSTrond Myklebust int ret; 603ac6feceeSTrond Myklebust 604ac6feceeSTrond Myklebust dget(dentry); 605ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 606ac6feceeSTrond Myklebust d_delete(dentry); 607ac6feceeSTrond Myklebust dput(dentry); 608ac6feceeSTrond Myklebust return ret; 609ac6feceeSTrond Myklebust } 610ac6feceeSTrond Myklebust 611eee17325SStanislav Kinsbursky int rpc_rmdir(struct dentry *dentry) 612eee17325SStanislav Kinsbursky { 613eee17325SStanislav Kinsbursky struct dentry *parent; 614eee17325SStanislav Kinsbursky struct inode *dir; 615eee17325SStanislav Kinsbursky int error; 616eee17325SStanislav Kinsbursky 617eee17325SStanislav Kinsbursky parent = dget_parent(dentry); 618eee17325SStanislav Kinsbursky dir = parent->d_inode; 619eee17325SStanislav Kinsbursky mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 620eee17325SStanislav Kinsbursky error = __rpc_rmdir(dir, dentry); 621eee17325SStanislav Kinsbursky mutex_unlock(&dir->i_mutex); 622eee17325SStanislav Kinsbursky dput(parent); 623eee17325SStanislav Kinsbursky return error; 624eee17325SStanislav Kinsbursky } 625eee17325SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_rmdir); 626eee17325SStanislav Kinsbursky 627810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 628810d90bcSTrond Myklebust { 629810d90bcSTrond Myklebust int ret; 630810d90bcSTrond Myklebust 631810d90bcSTrond Myklebust dget(dentry); 632810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 633810d90bcSTrond Myklebust d_delete(dentry); 634810d90bcSTrond Myklebust dput(dentry); 635810d90bcSTrond Myklebust return ret; 636810d90bcSTrond Myklebust } 637810d90bcSTrond Myklebust 638810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 639810d90bcSTrond Myklebust { 640810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 641810d90bcSTrond Myklebust 642810d90bcSTrond Myklebust rpc_close_pipes(inode); 643810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 644810d90bcSTrond Myklebust } 645810d90bcSTrond Myklebust 646cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 647d3db90b0SAl Viro const char *name) 648cfeaa4a3STrond Myklebust { 649d3db90b0SAl Viro struct qstr q = QSTR_INIT(name, strlen(name)); 650d3db90b0SAl Viro struct dentry *dentry = d_hash_and_lookup(parent, &q); 6515bff0386SStanislav Kinsbursky if (!dentry) { 652d3db90b0SAl Viro dentry = d_alloc(parent, &q); 6535bff0386SStanislav Kinsbursky if (!dentry) 6545bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6555bff0386SStanislav Kinsbursky } 65676fa6665SJeff Layton if (dentry->d_inode == NULL) 657f1f0abe1SDan Carpenter return dentry; 658cfeaa4a3STrond Myklebust dput(dentry); 659cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 660cfeaa4a3STrond Myklebust } 661cfeaa4a3STrond Myklebust 6621da177e4SLinus Torvalds /* 6631da177e4SLinus Torvalds * FIXME: This probably has races. 6641da177e4SLinus Torvalds */ 665ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 666ac6feceeSTrond Myklebust const struct rpc_filelist *files, 667ac6feceeSTrond Myklebust int start, int eof) 6681da177e4SLinus Torvalds { 6691da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 670ac6feceeSTrond Myklebust struct dentry *dentry; 671ac6feceeSTrond Myklebust struct qstr name; 672ac6feceeSTrond Myklebust int i; 673ac6feceeSTrond Myklebust 674ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 675ac6feceeSTrond Myklebust name.name = files[i].name; 676ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 677d3db90b0SAl Viro dentry = d_hash_and_lookup(parent, &name); 678ac6feceeSTrond Myklebust 679ac6feceeSTrond Myklebust if (dentry == NULL) 680ac6feceeSTrond Myklebust continue; 681ac6feceeSTrond Myklebust if (dentry->d_inode == NULL) 682ac6feceeSTrond Myklebust goto next; 683ac6feceeSTrond Myklebust switch (dentry->d_inode->i_mode & S_IFMT) { 684ac6feceeSTrond Myklebust default: 685ac6feceeSTrond Myklebust BUG(); 686ac6feceeSTrond Myklebust case S_IFREG: 687ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 688ac6feceeSTrond Myklebust break; 689ac6feceeSTrond Myklebust case S_IFDIR: 690ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 691ac6feceeSTrond Myklebust } 692ac6feceeSTrond Myklebust next: 693ac6feceeSTrond Myklebust dput(dentry); 694ac6feceeSTrond Myklebust } 695ac6feceeSTrond Myklebust } 696ac6feceeSTrond Myklebust 697ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 698ac6feceeSTrond Myklebust const struct rpc_filelist *files, 699ac6feceeSTrond Myklebust int start, int eof) 700ac6feceeSTrond Myklebust { 701ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7021da177e4SLinus Torvalds 703c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); 704ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7051b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 708ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 709ac6feceeSTrond Myklebust const struct rpc_filelist *files, 710ac6feceeSTrond Myklebust int start, int eof, 711ac6feceeSTrond Myklebust void *private) 7121da177e4SLinus Torvalds { 713ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7141da177e4SLinus Torvalds struct dentry *dentry; 715ac6feceeSTrond Myklebust int i, err; 7161da177e4SLinus Torvalds 7171b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 7181da177e4SLinus Torvalds for (i = start; i < eof; i++) { 719d3db90b0SAl Viro dentry = __rpc_lookup_create_exclusive(parent, files[i].name); 720ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 721ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 7221da177e4SLinus Torvalds goto out_bad; 723ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 724ac6feceeSTrond Myklebust default: 725ac6feceeSTrond Myklebust BUG(); 726ac6feceeSTrond Myklebust case S_IFREG: 727ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 728ac6feceeSTrond Myklebust files[i].mode, 729ac6feceeSTrond Myklebust files[i].i_fop, 730ac6feceeSTrond Myklebust private); 731ac6feceeSTrond Myklebust break; 732ac6feceeSTrond Myklebust case S_IFDIR: 733ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 734ac6feceeSTrond Myklebust files[i].mode, 735ac6feceeSTrond Myklebust NULL, 736ac6feceeSTrond Myklebust private); 7371da177e4SLinus Torvalds } 738ac6feceeSTrond Myklebust if (err != 0) 739ac6feceeSTrond Myklebust goto out_bad; 7401da177e4SLinus Torvalds } 7411b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7421da177e4SLinus Torvalds return 0; 7431da177e4SLinus Torvalds out_bad: 744ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7451b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7461e903edaSAl Viro printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", 7471e903edaSAl Viro __FILE__, __func__, parent); 748ac6feceeSTrond Myklebust return err; 749f134585aSTrond Myklebust } 750f134585aSTrond Myklebust 751e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 752a95e691fSAl Viro const char *name, umode_t mode, void *private, 753e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 754f134585aSTrond Myklebust { 755f134585aSTrond Myklebust struct dentry *dentry; 7567d59d1e8STrond Myklebust struct inode *dir = parent->d_inode; 757f134585aSTrond Myklebust int error; 758f134585aSTrond Myklebust 7597d59d1e8STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 7607d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 761f134585aSTrond Myklebust if (IS_ERR(dentry)) 7627d59d1e8STrond Myklebust goto out; 7637d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7647589806eSTrond Myklebust if (error != 0) 7657589806eSTrond Myklebust goto out_err; 766e57aed77STrond Myklebust if (populate != NULL) { 767e57aed77STrond Myklebust error = populate(dentry, args_populate); 768f134585aSTrond Myklebust if (error) 769ac6feceeSTrond Myklebust goto err_rmdir; 770e57aed77STrond Myklebust } 771f134585aSTrond Myklebust out: 7721b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7735c3e985aSTrond Myklebust return dentry; 774ac6feceeSTrond Myklebust err_rmdir: 775f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7767589806eSTrond Myklebust out_err: 777f134585aSTrond Myklebust dentry = ERR_PTR(error); 778f134585aSTrond Myklebust goto out; 779f134585aSTrond Myklebust } 780f134585aSTrond Myklebust 781e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 782e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 783f134585aSTrond Myklebust { 784dff02cc1STrond Myklebust struct dentry *parent; 785f134585aSTrond Myklebust struct inode *dir; 786f134585aSTrond Myklebust int error; 787f134585aSTrond Myklebust 788dff02cc1STrond Myklebust parent = dget_parent(dentry); 789dff02cc1STrond Myklebust dir = parent->d_inode; 790c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 791e57aed77STrond Myklebust if (depopulate != NULL) 792e57aed77STrond Myklebust depopulate(dentry); 793f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 7941b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 795dff02cc1STrond Myklebust dput(parent); 796f134585aSTrond Myklebust return error; 797f134585aSTrond Myklebust } 7981da177e4SLinus Torvalds 79993a44a75SJ. Bruce Fields /** 80093a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 80193a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 80293a44a75SJ. Bruce Fields * @name: name of pipe 80393a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 804bda14606SRandy Dunlap * @pipe: &rpc_pipe containing input parameters 80593a44a75SJ. Bruce Fields * 80693a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 80793a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 80893a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 80993a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 81093a44a75SJ. Bruce Fields * 81193a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 81293a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 81393a44a75SJ. Bruce Fields * 81493a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 815496ad9aaSAl Viro * from the file pointer, via RPC_I(file_inode(file))->private. 81693a44a75SJ. Bruce Fields */ 817c239d83bSStanislav Kinsbursky struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, 818c239d83bSStanislav Kinsbursky void *private, struct rpc_pipe *pipe) 8191da177e4SLinus Torvalds { 8201da177e4SLinus Torvalds struct dentry *dentry; 8217589806eSTrond Myklebust struct inode *dir = parent->d_inode; 8227364af6aSTrond Myklebust umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; 8237589806eSTrond Myklebust int err; 8247364af6aSTrond Myklebust 825c239d83bSStanislav Kinsbursky if (pipe->ops->upcall == NULL) 8267364af6aSTrond Myklebust umode &= ~S_IRUGO; 827c239d83bSStanislav Kinsbursky if (pipe->ops->downcall == NULL) 8287364af6aSTrond Myklebust umode &= ~S_IWUGO; 8291da177e4SLinus Torvalds 830cfeaa4a3STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 831d3db90b0SAl Viro dentry = __rpc_lookup_create_exclusive(parent, name); 8321da177e4SLinus Torvalds if (IS_ERR(dentry)) 833cfeaa4a3STrond Myklebust goto out; 834c239d83bSStanislav Kinsbursky err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, 835c239d83bSStanislav Kinsbursky private, pipe); 8367589806eSTrond Myklebust if (err) 8377589806eSTrond Myklebust goto out_err; 838f134585aSTrond Myklebust out: 8391b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8405c3e985aSTrond Myklebust return dentry; 8417589806eSTrond Myklebust out_err: 8427589806eSTrond Myklebust dentry = ERR_PTR(err); 8431e903edaSAl Viro printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", 8441e903edaSAl Viro __FILE__, __func__, parent, name, 8457589806eSTrond Myklebust err); 846f134585aSTrond Myklebust goto out; 8471da177e4SLinus Torvalds } 848c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); 8491da177e4SLinus Torvalds 85093a44a75SJ. Bruce Fields /** 85193a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 85293a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 85393a44a75SJ. Bruce Fields * 85493a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 85593a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 85693a44a75SJ. Bruce Fields * return -EPIPE. 85793a44a75SJ. Bruce Fields */ 858f134585aSTrond Myklebust int 8595d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8601da177e4SLinus Torvalds { 8615d67476fSTrond Myklebust struct dentry *parent; 862f134585aSTrond Myklebust struct inode *dir; 8635d67476fSTrond Myklebust int error = 0; 8641da177e4SLinus Torvalds 8655d67476fSTrond Myklebust parent = dget_parent(dentry); 8665d67476fSTrond Myklebust dir = parent->d_inode; 867c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 868810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8691b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8705d67476fSTrond Myklebust dput(parent); 871f134585aSTrond Myklebust return error; 8721da177e4SLinus Torvalds } 873468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8741da177e4SLinus Torvalds 8756739ffb7STrond Myklebust /** 8766739ffb7STrond Myklebust * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head 8776739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 8786739ffb7STrond Myklebust */ 8796739ffb7STrond Myklebust void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) 8806739ffb7STrond Myklebust { 8816739ffb7STrond Myklebust INIT_LIST_HEAD(&pdh->pdh_entries); 8826739ffb7STrond Myklebust pdh->pdh_dentry = NULL; 8836739ffb7STrond Myklebust } 8846739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); 8856739ffb7STrond Myklebust 8866739ffb7STrond Myklebust /** 8876739ffb7STrond Myklebust * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object 8886739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 8896739ffb7STrond Myklebust * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops 8906739ffb7STrond Myklebust * @pdo_data: pointer to caller-defined data 8916739ffb7STrond Myklebust */ 8926739ffb7STrond Myklebust void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, 8936739ffb7STrond Myklebust const struct rpc_pipe_dir_object_ops *pdo_ops, 8946739ffb7STrond Myklebust void *pdo_data) 8956739ffb7STrond Myklebust { 8966739ffb7STrond Myklebust INIT_LIST_HEAD(&pdo->pdo_head); 8976739ffb7STrond Myklebust pdo->pdo_ops = pdo_ops; 8986739ffb7STrond Myklebust pdo->pdo_data = pdo_data; 8996739ffb7STrond Myklebust } 9006739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); 9016739ffb7STrond Myklebust 9026739ffb7STrond Myklebust static int 9036739ffb7STrond Myklebust rpc_add_pipe_dir_object_locked(struct net *net, 9046739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9056739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9066739ffb7STrond Myklebust { 9076739ffb7STrond Myklebust int ret = 0; 9086739ffb7STrond Myklebust 9096739ffb7STrond Myklebust if (pdh->pdh_dentry) 9106739ffb7STrond Myklebust ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); 9116739ffb7STrond Myklebust if (ret == 0) 9126739ffb7STrond Myklebust list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); 9136739ffb7STrond Myklebust return ret; 9146739ffb7STrond Myklebust } 9156739ffb7STrond Myklebust 9166739ffb7STrond Myklebust static void 9176739ffb7STrond Myklebust rpc_remove_pipe_dir_object_locked(struct net *net, 9186739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9196739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9206739ffb7STrond Myklebust { 9216739ffb7STrond Myklebust if (pdh->pdh_dentry) 9226739ffb7STrond Myklebust pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); 9236739ffb7STrond Myklebust list_del_init(&pdo->pdo_head); 9246739ffb7STrond Myklebust } 9256739ffb7STrond Myklebust 9266739ffb7STrond Myklebust /** 9276739ffb7STrond Myklebust * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory 9286739ffb7STrond Myklebust * @net: pointer to struct net 9296739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 9306739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 9316739ffb7STrond Myklebust * 9326739ffb7STrond Myklebust */ 9336739ffb7STrond Myklebust int 9346739ffb7STrond Myklebust rpc_add_pipe_dir_object(struct net *net, 9356739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9366739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9376739ffb7STrond Myklebust { 9386739ffb7STrond Myklebust int ret = 0; 9396739ffb7STrond Myklebust 9406739ffb7STrond Myklebust if (list_empty(&pdo->pdo_head)) { 9416739ffb7STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 9426739ffb7STrond Myklebust 9436739ffb7STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 9446739ffb7STrond Myklebust ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); 9456739ffb7STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 9466739ffb7STrond Myklebust } 9476739ffb7STrond Myklebust return ret; 9486739ffb7STrond Myklebust } 9496739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); 9506739ffb7STrond Myklebust 9516739ffb7STrond Myklebust /** 9526739ffb7STrond Myklebust * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory 9536739ffb7STrond Myklebust * @net: pointer to struct net 9546739ffb7STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 9556739ffb7STrond Myklebust * @pdo: pointer to struct rpc_pipe_dir_object 9566739ffb7STrond Myklebust * 9576739ffb7STrond Myklebust */ 9586739ffb7STrond Myklebust void 9596739ffb7STrond Myklebust rpc_remove_pipe_dir_object(struct net *net, 9606739ffb7STrond Myklebust struct rpc_pipe_dir_head *pdh, 9616739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo) 9626739ffb7STrond Myklebust { 9636739ffb7STrond Myklebust if (!list_empty(&pdo->pdo_head)) { 9646739ffb7STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 9656739ffb7STrond Myklebust 9666739ffb7STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 9676739ffb7STrond Myklebust rpc_remove_pipe_dir_object_locked(net, pdh, pdo); 9686739ffb7STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 9696739ffb7STrond Myklebust } 9706739ffb7STrond Myklebust } 9716739ffb7STrond Myklebust EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); 9726739ffb7STrond Myklebust 973298fc355STrond Myklebust /** 974298fc355STrond Myklebust * rpc_find_or_alloc_pipe_dir_object 975298fc355STrond Myklebust * @net: pointer to struct net 976298fc355STrond Myklebust * @pdh: pointer to struct rpc_pipe_dir_head 977298fc355STrond Myklebust * @match: match struct rpc_pipe_dir_object to data 978298fc355STrond Myklebust * @alloc: allocate a new struct rpc_pipe_dir_object 979298fc355STrond Myklebust * @data: user defined data for match() and alloc() 980298fc355STrond Myklebust * 981298fc355STrond Myklebust */ 982298fc355STrond Myklebust struct rpc_pipe_dir_object * 983298fc355STrond Myklebust rpc_find_or_alloc_pipe_dir_object(struct net *net, 984298fc355STrond Myklebust struct rpc_pipe_dir_head *pdh, 985298fc355STrond Myklebust int (*match)(struct rpc_pipe_dir_object *, void *), 986298fc355STrond Myklebust struct rpc_pipe_dir_object *(*alloc)(void *), 987298fc355STrond Myklebust void *data) 988298fc355STrond Myklebust { 989298fc355STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 990298fc355STrond Myklebust struct rpc_pipe_dir_object *pdo; 991298fc355STrond Myklebust 992298fc355STrond Myklebust mutex_lock(&sn->pipefs_sb_lock); 993298fc355STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { 994298fc355STrond Myklebust if (!match(pdo, data)) 995298fc355STrond Myklebust continue; 996298fc355STrond Myklebust goto out; 997298fc355STrond Myklebust } 998298fc355STrond Myklebust pdo = alloc(data); 999298fc355STrond Myklebust if (!pdo) 1000298fc355STrond Myklebust goto out; 1001298fc355STrond Myklebust rpc_add_pipe_dir_object_locked(net, pdh, pdo); 1002298fc355STrond Myklebust out: 1003298fc355STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 1004298fc355STrond Myklebust return pdo; 1005298fc355STrond Myklebust } 1006298fc355STrond Myklebust EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); 1007298fc355STrond Myklebust 10086739ffb7STrond Myklebust static void 10096739ffb7STrond Myklebust rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) 10106739ffb7STrond Myklebust { 10116739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo; 10126739ffb7STrond Myklebust struct dentry *dir = pdh->pdh_dentry; 10136739ffb7STrond Myklebust 10146739ffb7STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) 10156739ffb7STrond Myklebust pdo->pdo_ops->create(dir, pdo); 10166739ffb7STrond Myklebust } 10176739ffb7STrond Myklebust 10186739ffb7STrond Myklebust static void 10196739ffb7STrond Myklebust rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) 10206739ffb7STrond Myklebust { 10216739ffb7STrond Myklebust struct rpc_pipe_dir_object *pdo; 10226739ffb7STrond Myklebust struct dentry *dir = pdh->pdh_dentry; 10236739ffb7STrond Myklebust 10246739ffb7STrond Myklebust list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) 10256739ffb7STrond Myklebust pdo->pdo_ops->destroy(dir, pdo); 10266739ffb7STrond Myklebust } 10276739ffb7STrond Myklebust 1028e57aed77STrond Myklebust enum { 1029e57aed77STrond Myklebust RPCAUTH_info, 1030e57aed77STrond Myklebust RPCAUTH_EOF 1031e57aed77STrond Myklebust }; 1032e57aed77STrond Myklebust 1033e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 1034e57aed77STrond Myklebust [RPCAUTH_info] = { 1035e57aed77STrond Myklebust .name = "info", 1036e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 1037e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 1038e57aed77STrond Myklebust }, 1039e57aed77STrond Myklebust }; 1040e57aed77STrond Myklebust 1041e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 1042e57aed77STrond Myklebust { 1043e57aed77STrond Myklebust return rpc_populate(dentry, 1044e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 1045e57aed77STrond Myklebust private); 1046e57aed77STrond Myklebust } 1047e57aed77STrond Myklebust 1048e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 1049e57aed77STrond Myklebust { 1050e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 1051e57aed77STrond Myklebust } 1052e57aed77STrond Myklebust 10537d59d1e8STrond Myklebust /** 10547d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 1055a95e691fSAl Viro * @dentry: the parent of new directory 1056a95e691fSAl Viro * @name: the name of new directory 10577d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 10587d59d1e8STrond Myklebust * 10597d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 10607d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 10617d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 10627d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 10637d59d1e8STrond Myklebust */ 106423ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 1065a95e691fSAl Viro const char *name, 10667d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 10677d59d1e8STrond Myklebust { 10686739ffb7STrond Myklebust struct dentry *ret; 10696739ffb7STrond Myklebust 10706739ffb7STrond Myklebust ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 1071e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 10726739ffb7STrond Myklebust if (!IS_ERR(ret)) { 10736739ffb7STrond Myklebust rpc_client->cl_pipedir_objects.pdh_dentry = ret; 10746739ffb7STrond Myklebust rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); 10756739ffb7STrond Myklebust } 10766739ffb7STrond Myklebust return ret; 1077e57aed77STrond Myklebust } 1078e57aed77STrond Myklebust 1079e57aed77STrond Myklebust /** 1080e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 10816739ffb7STrond Myklebust * @rpc_client: rpc_client for the pipe 1082e57aed77STrond Myklebust */ 1083c36dcfe1STrond Myklebust int rpc_remove_client_dir(struct rpc_clnt *rpc_client) 1084e57aed77STrond Myklebust { 1085c36dcfe1STrond Myklebust struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; 1086c36dcfe1STrond Myklebust 1087c36dcfe1STrond Myklebust if (dentry == NULL) 1088c36dcfe1STrond Myklebust return 0; 10896739ffb7STrond Myklebust rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); 10906739ffb7STrond Myklebust rpc_client->cl_pipedir_objects.pdh_dentry = NULL; 1091e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 10927d59d1e8STrond Myklebust } 10937d59d1e8STrond Myklebust 10948854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 10958854e82dSTrond Myklebust [0] = { 10968854e82dSTrond Myklebust .name = "channel", 10978854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 109896c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 10998854e82dSTrond Myklebust }, 11008854e82dSTrond Myklebust [1] = { 11018854e82dSTrond Myklebust .name = "content", 11028854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 11038854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 11048854e82dSTrond Myklebust }, 11058854e82dSTrond Myklebust [2] = { 11068854e82dSTrond Myklebust .name = "flush", 11078854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 11088854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 11098854e82dSTrond Myklebust }, 11108854e82dSTrond Myklebust }; 11118854e82dSTrond Myklebust 11128854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 11138854e82dSTrond Myklebust { 11148854e82dSTrond Myklebust return rpc_populate(dentry, 11158854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 11168854e82dSTrond Myklebust private); 11178854e82dSTrond Myklebust } 11188854e82dSTrond Myklebust 11198854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 11208854e82dSTrond Myklebust { 11218854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 11228854e82dSTrond Myklebust } 11238854e82dSTrond Myklebust 1124a95e691fSAl Viro struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, 112564f1426fSAl Viro umode_t umode, struct cache_detail *cd) 11268854e82dSTrond Myklebust { 11278854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 11288854e82dSTrond Myklebust rpc_cachedir_populate, cd); 11298854e82dSTrond Myklebust } 11308854e82dSTrond Myklebust 11318854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 11328854e82dSTrond Myklebust { 11338854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 11348854e82dSTrond Myklebust } 11358854e82dSTrond Myklebust 11361da177e4SLinus Torvalds /* 11371da177e4SLinus Torvalds * populate the filesystem 11381da177e4SLinus Torvalds */ 1139b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 11401da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 11411da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 11421da177e4SLinus Torvalds .statfs = simple_statfs, 11431da177e4SLinus Torvalds }; 11441da177e4SLinus Torvalds 11451da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 11461da177e4SLinus Torvalds 1147bb156749STrond Myklebust /* 1148bb156749STrond Myklebust * We have a single directory with 1 node in it. 1149bb156749STrond Myklebust */ 1150bb156749STrond Myklebust enum { 1151bb156749STrond Myklebust RPCAUTH_lockd, 1152bb156749STrond Myklebust RPCAUTH_mount, 1153bb156749STrond Myklebust RPCAUTH_nfs, 1154bb156749STrond Myklebust RPCAUTH_portmap, 1155bb156749STrond Myklebust RPCAUTH_statd, 1156bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 1157e571cbf1STrond Myklebust RPCAUTH_cache, 1158b3537c35SJeff Layton RPCAUTH_nfsd, 11594b9a445eSJeff Layton RPCAUTH_gssd, 1160bb156749STrond Myklebust RPCAUTH_RootEOF 1161bb156749STrond Myklebust }; 1162bb156749STrond Myklebust 1163bb156749STrond Myklebust static const struct rpc_filelist files[] = { 1164bb156749STrond Myklebust [RPCAUTH_lockd] = { 1165bb156749STrond Myklebust .name = "lockd", 1166bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1167bb156749STrond Myklebust }, 1168bb156749STrond Myklebust [RPCAUTH_mount] = { 1169bb156749STrond Myklebust .name = "mount", 1170bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1171bb156749STrond Myklebust }, 1172bb156749STrond Myklebust [RPCAUTH_nfs] = { 1173bb156749STrond Myklebust .name = "nfs", 1174bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1175bb156749STrond Myklebust }, 1176bb156749STrond Myklebust [RPCAUTH_portmap] = { 1177bb156749STrond Myklebust .name = "portmap", 1178bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1179bb156749STrond Myklebust }, 1180bb156749STrond Myklebust [RPCAUTH_statd] = { 1181bb156749STrond Myklebust .name = "statd", 1182bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1183bb156749STrond Myklebust }, 1184bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 1185bb156749STrond Myklebust .name = "nfsd4_cb", 1186bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1187bb156749STrond Myklebust }, 1188e571cbf1STrond Myklebust [RPCAUTH_cache] = { 1189e571cbf1STrond Myklebust .name = "cache", 1190e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1191e571cbf1STrond Myklebust }, 1192b3537c35SJeff Layton [RPCAUTH_nfsd] = { 1193b3537c35SJeff Layton .name = "nfsd", 1194b3537c35SJeff Layton .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1195b3537c35SJeff Layton }, 11964b9a445eSJeff Layton [RPCAUTH_gssd] = { 11974b9a445eSJeff Layton .name = "gssd", 11984b9a445eSJeff Layton .mode = S_IFDIR | S_IRUGO | S_IXUGO, 11994b9a445eSJeff Layton }, 1200bb156749STrond Myklebust }; 1201bb156749STrond Myklebust 1202432eb1a5SStanislav Kinsbursky /* 1203432eb1a5SStanislav Kinsbursky * This call can be used only in RPC pipefs mount notification hooks. 1204432eb1a5SStanislav Kinsbursky */ 1205432eb1a5SStanislav Kinsbursky struct dentry *rpc_d_lookup_sb(const struct super_block *sb, 1206432eb1a5SStanislav Kinsbursky const unsigned char *dir_name) 1207432eb1a5SStanislav Kinsbursky { 120826fe5750SLinus Torvalds struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); 1209d3db90b0SAl Viro return d_hash_and_lookup(sb->s_root, &dir); 1210432eb1a5SStanislav Kinsbursky } 1211432eb1a5SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 1212432eb1a5SStanislav Kinsbursky 12134b9a445eSJeff Layton int rpc_pipefs_init_net(struct net *net) 1214c21a588fSStanislav Kinsbursky { 1215c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1216c21a588fSStanislav Kinsbursky 12174b9a445eSJeff Layton sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); 12184b9a445eSJeff Layton if (IS_ERR(sn->gssd_dummy)) 12194b9a445eSJeff Layton return PTR_ERR(sn->gssd_dummy); 12204b9a445eSJeff Layton 1221c21a588fSStanislav Kinsbursky mutex_init(&sn->pipefs_sb_lock); 12222aed8b47STrond Myklebust sn->pipe_version = -1; 12234b9a445eSJeff Layton return 0; 12244b9a445eSJeff Layton } 12254b9a445eSJeff Layton 12264b9a445eSJeff Layton void rpc_pipefs_exit_net(struct net *net) 12274b9a445eSJeff Layton { 12284b9a445eSJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 12294b9a445eSJeff Layton 12304b9a445eSJeff Layton rpc_destroy_pipe_data(sn->gssd_dummy); 1231c21a588fSStanislav Kinsbursky } 1232c21a588fSStanislav Kinsbursky 1233c21a588fSStanislav Kinsbursky /* 1234c21a588fSStanislav Kinsbursky * This call will be used for per network namespace operations calls. 1235c21a588fSStanislav Kinsbursky * Note: Function will be returned with pipefs_sb_lock taken if superblock was 1236c21a588fSStanislav Kinsbursky * found. This lock have to be released by rpc_put_sb_net() when all operations 1237c21a588fSStanislav Kinsbursky * will be completed. 1238c21a588fSStanislav Kinsbursky */ 1239c21a588fSStanislav Kinsbursky struct super_block *rpc_get_sb_net(const struct net *net) 1240c21a588fSStanislav Kinsbursky { 1241c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1242c21a588fSStanislav Kinsbursky 1243c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1244c21a588fSStanislav Kinsbursky if (sn->pipefs_sb) 1245c21a588fSStanislav Kinsbursky return sn->pipefs_sb; 1246c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1247c21a588fSStanislav Kinsbursky return NULL; 1248c21a588fSStanislav Kinsbursky } 1249c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_get_sb_net); 1250c21a588fSStanislav Kinsbursky 1251c21a588fSStanislav Kinsbursky void rpc_put_sb_net(const struct net *net) 1252c21a588fSStanislav Kinsbursky { 1253c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1254c21a588fSStanislav Kinsbursky 1255749386e9SWeston Andros Adamson WARN_ON(sn->pipefs_sb == NULL); 1256c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1257c21a588fSStanislav Kinsbursky } 1258c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_put_sb_net); 1259c21a588fSStanislav Kinsbursky 12604b9a445eSJeff Layton static const struct rpc_filelist gssd_dummy_clnt_dir[] = { 12614b9a445eSJeff Layton [0] = { 12624b9a445eSJeff Layton .name = "clntXX", 12634b9a445eSJeff Layton .mode = S_IFDIR | S_IRUGO | S_IXUGO, 12644b9a445eSJeff Layton }, 12654b9a445eSJeff Layton }; 12664b9a445eSJeff Layton 12674b9a445eSJeff Layton static ssize_t 12684b9a445eSJeff Layton dummy_downcall(struct file *filp, const char __user *src, size_t len) 12694b9a445eSJeff Layton { 12704b9a445eSJeff Layton return -EINVAL; 12714b9a445eSJeff Layton } 12724b9a445eSJeff Layton 12734b9a445eSJeff Layton static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { 12744b9a445eSJeff Layton .upcall = rpc_pipe_generic_upcall, 12754b9a445eSJeff Layton .downcall = dummy_downcall, 12764b9a445eSJeff Layton }; 12774b9a445eSJeff Layton 12784b9a445eSJeff Layton /** 12794b9a445eSJeff Layton * rpc_gssd_dummy_populate - create a dummy gssd pipe 12804b9a445eSJeff Layton * @root: root of the rpc_pipefs filesystem 12814b9a445eSJeff Layton * @pipe_data: pipe data created when netns is initialized 12824b9a445eSJeff Layton * 12834b9a445eSJeff Layton * Create a dummy set of directories and a pipe that gssd can hold open to 12844b9a445eSJeff Layton * indicate that it is up and running. 12854b9a445eSJeff Layton */ 12864b9a445eSJeff Layton static struct dentry * 12874b9a445eSJeff Layton rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) 12884b9a445eSJeff Layton { 12894b9a445eSJeff Layton int ret = 0; 12904b9a445eSJeff Layton struct dentry *gssd_dentry; 12914b9a445eSJeff Layton struct dentry *clnt_dentry = NULL; 12924b9a445eSJeff Layton struct dentry *pipe_dentry = NULL; 12934b9a445eSJeff Layton struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, 12944b9a445eSJeff Layton strlen(files[RPCAUTH_gssd].name)); 12954b9a445eSJeff Layton 12964b9a445eSJeff Layton /* We should never get this far if "gssd" doesn't exist */ 12974b9a445eSJeff Layton gssd_dentry = d_hash_and_lookup(root, &q); 12984b9a445eSJeff Layton if (!gssd_dentry) 12994b9a445eSJeff Layton return ERR_PTR(-ENOENT); 13004b9a445eSJeff Layton 13014b9a445eSJeff Layton ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); 13024b9a445eSJeff Layton if (ret) { 13034b9a445eSJeff Layton pipe_dentry = ERR_PTR(ret); 13044b9a445eSJeff Layton goto out; 13054b9a445eSJeff Layton } 13064b9a445eSJeff Layton 13074b9a445eSJeff Layton q.name = gssd_dummy_clnt_dir[0].name; 13084b9a445eSJeff Layton q.len = strlen(gssd_dummy_clnt_dir[0].name); 13094b9a445eSJeff Layton clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); 13104b9a445eSJeff Layton if (!clnt_dentry) { 13114b9a445eSJeff Layton pipe_dentry = ERR_PTR(-ENOENT); 13124b9a445eSJeff Layton goto out; 13134b9a445eSJeff Layton } 13144b9a445eSJeff Layton 13154b9a445eSJeff Layton pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); 13163396f92fSJeff Layton if (IS_ERR(pipe_dentry)) 13173396f92fSJeff Layton __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); 13184b9a445eSJeff Layton out: 13194b9a445eSJeff Layton dput(clnt_dentry); 13204b9a445eSJeff Layton dput(gssd_dentry); 13214b9a445eSJeff Layton return pipe_dentry; 13224b9a445eSJeff Layton } 13234b9a445eSJeff Layton 13241da177e4SLinus Torvalds static int 13251da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 13261da177e4SLinus Torvalds { 13271da177e4SLinus Torvalds struct inode *inode; 13284b9a445eSJeff Layton struct dentry *root, *gssd_dentry; 132938b0da75SStanislav Kinsbursky struct net *net = data; 133090c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 13312d00131aSStanislav Kinsbursky int err; 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 13341da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 13351da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 13361da177e4SLinus Torvalds sb->s_op = &s_ops; 1337b26d4cd3SAl Viro sb->s_d_op = &simple_dentry_operations; 13381da177e4SLinus Torvalds sb->s_time_gran = 1; 13391da177e4SLinus Torvalds 13407e450b4eSJeff Layton inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); 134148fde701SAl Viro sb->s_root = root = d_make_root(inode); 134248fde701SAl Viro if (!root) 13431da177e4SLinus Torvalds return -ENOMEM; 1344ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 13451da177e4SLinus Torvalds return -ENOMEM; 13464b9a445eSJeff Layton 13474b9a445eSJeff Layton gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); 13484b9a445eSJeff Layton if (IS_ERR(gssd_dentry)) { 13494b9a445eSJeff Layton __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 13504b9a445eSJeff Layton return PTR_ERR(gssd_dentry); 13514b9a445eSJeff Layton } 13524b9a445eSJeff Layton 1353d8af9bc1SChuck Lever dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", 1354d8af9bc1SChuck Lever net, NET_NAME(net)); 135538481605SStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 135637629b57SStanislav Kinsbursky sn->pipefs_sb = sb; 13572d00131aSStanislav Kinsbursky err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 13582d00131aSStanislav Kinsbursky RPC_PIPEFS_MOUNT, 13592d00131aSStanislav Kinsbursky sb); 13602d00131aSStanislav Kinsbursky if (err) 13612d00131aSStanislav Kinsbursky goto err_depopulate; 1362021c68deSStanislav Kinsbursky sb->s_fs_info = get_net(net); 136338481605SStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1364fc7bed8cSAl Viro return 0; 13652d00131aSStanislav Kinsbursky 13662d00131aSStanislav Kinsbursky err_depopulate: 13674b9a445eSJeff Layton dput(gssd_dentry); 13682d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 13692d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 13702d00131aSStanislav Kinsbursky sb); 137137629b57SStanislav Kinsbursky sn->pipefs_sb = NULL; 13722d00131aSStanislav Kinsbursky __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 137338481605SStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 13742d00131aSStanislav Kinsbursky return err; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds 137789f84243SJeff Layton bool 137889f84243SJeff Layton gssd_running(struct net *net) 137989f84243SJeff Layton { 138089f84243SJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 138189f84243SJeff Layton struct rpc_pipe *pipe = sn->gssd_dummy; 138289f84243SJeff Layton 138389f84243SJeff Layton return pipe->nreaders || pipe->nwriters; 138489f84243SJeff Layton } 138589f84243SJeff Layton EXPORT_SYMBOL_GPL(gssd_running); 138689f84243SJeff Layton 1387fc14f2feSAl Viro static struct dentry * 1388fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1389fc14f2feSAl Viro int flags, const char *dev_name, void *data) 13901da177e4SLinus Torvalds { 139138b0da75SStanislav Kinsbursky return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); 13921da177e4SLinus Torvalds } 13931da177e4SLinus Torvalds 139409acfea5STrond Myklebust static void rpc_kill_sb(struct super_block *sb) 1395021c68deSStanislav Kinsbursky { 1396021c68deSStanislav Kinsbursky struct net *net = sb->s_fs_info; 139790c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1398021c68deSStanislav Kinsbursky 1399c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1400642fe4d0STrond Myklebust if (sn->pipefs_sb != sb) { 1401642fe4d0STrond Myklebust mutex_unlock(&sn->pipefs_sb_lock); 1402642fe4d0STrond Myklebust goto out; 1403642fe4d0STrond Myklebust } 140490c4e829SStanislav Kinsbursky sn->pipefs_sb = NULL; 1405d8af9bc1SChuck Lever dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", 1406d8af9bc1SChuck Lever net, NET_NAME(net)); 14072d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 14082d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 14092d00131aSStanislav Kinsbursky sb); 1410adb6fa7fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1411642fe4d0STrond Myklebust put_net(net); 1412642fe4d0STrond Myklebust out: 1413021c68deSStanislav Kinsbursky kill_litter_super(sb); 14141da177e4SLinus Torvalds } 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 14171da177e4SLinus Torvalds .owner = THIS_MODULE, 14181da177e4SLinus Torvalds .name = "rpc_pipefs", 1419fc14f2feSAl Viro .mount = rpc_mount, 1420021c68deSStanislav Kinsbursky .kill_sb = rpc_kill_sb, 14211da177e4SLinus Torvalds }; 14227f78e035SEric W. Biederman MODULE_ALIAS_FS("rpc_pipefs"); 1423fa7614ddSEric W. Biederman MODULE_ALIAS("rpc_pipefs"); 14241da177e4SLinus Torvalds 14251da177e4SLinus Torvalds static void 142651cc5068SAlexey Dobriyan init_once(void *foo) 14271da177e4SLinus Torvalds { 14281da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 14291da177e4SLinus Torvalds 14301da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 14311da177e4SLinus Torvalds rpci->private = NULL; 1432ba9e0975SStanislav Kinsbursky rpci->pipe = NULL; 14331da177e4SLinus Torvalds init_waitqueue_head(&rpci->waitq); 14341da177e4SLinus Torvalds } 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds int register_rpc_pipefs(void) 14371da177e4SLinus Torvalds { 14385bd5f581SAkinobu Mita int err; 14395bd5f581SAkinobu Mita 14401da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 14411da177e4SLinus Torvalds sizeof(struct rpc_inode), 1442fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1443fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 144420c2df83SPaul Mundt init_once); 14451da177e4SLinus Torvalds if (!rpc_inode_cachep) 14461da177e4SLinus Torvalds return -ENOMEM; 144780df9d20SStanislav Kinsbursky err = rpc_clients_notifier_register(); 144880df9d20SStanislav Kinsbursky if (err) 144980df9d20SStanislav Kinsbursky goto err_notifier; 14505bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 145180df9d20SStanislav Kinsbursky if (err) 145280df9d20SStanislav Kinsbursky goto err_register; 145380df9d20SStanislav Kinsbursky return 0; 145480df9d20SStanislav Kinsbursky 145580df9d20SStanislav Kinsbursky err_register: 145680df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 145780df9d20SStanislav Kinsbursky err_notifier: 14585bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 14595bd5f581SAkinobu Mita return err; 14605bd5f581SAkinobu Mita } 14615bd5f581SAkinobu Mita 14621da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 14631da177e4SLinus Torvalds { 146480df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 14651a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 14661da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 14671da177e4SLinus Torvalds } 1468