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> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <asm/ioctls.h> 211da177e4SLinus Torvalds #include <linux/fs.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 40fc14f2feSAl Viro static struct vfsmount *rpc_mnt __read_mostly; 411da177e4SLinus Torvalds static int rpc_mount_count; 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds 46e18b890bSChristoph Lameter static struct kmem_cache *rpc_inode_cachep __read_mostly; 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #define RPC_UPCALL_TIMEOUT (30*HZ) 491da177e4SLinus Torvalds 502d00131aSStanislav Kinsbursky static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); 512d00131aSStanislav Kinsbursky 522d00131aSStanislav Kinsbursky int rpc_pipefs_notifier_register(struct notifier_block *nb) 532d00131aSStanislav Kinsbursky { 542d00131aSStanislav Kinsbursky return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); 552d00131aSStanislav Kinsbursky } 562d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); 572d00131aSStanislav Kinsbursky 582d00131aSStanislav Kinsbursky void rpc_pipefs_notifier_unregister(struct notifier_block *nb) 592d00131aSStanislav Kinsbursky { 602d00131aSStanislav Kinsbursky blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); 612d00131aSStanislav Kinsbursky } 622d00131aSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); 632d00131aSStanislav Kinsbursky 64ba9e0975SStanislav Kinsbursky static void rpc_purge_list(struct rpc_pipe *pipe, struct list_head *head, 659842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *), int err) 66b3eb67a2STrond Myklebust { 67b3eb67a2STrond Myklebust struct rpc_pipe_msg *msg; 68b3eb67a2STrond Myklebust 699842ef35STrond Myklebust if (list_empty(head)) 709842ef35STrond Myklebust return; 719842ef35STrond Myklebust do { 72b3eb67a2STrond Myklebust msg = list_entry(head->next, struct rpc_pipe_msg, list); 735a67657aSTrond Myklebust list_del_init(&msg->list); 74b3eb67a2STrond Myklebust msg->errno = err; 75b3eb67a2STrond Myklebust destroy_msg(msg); 769842ef35STrond Myklebust } while (!list_empty(head)); 77ba9e0975SStanislav Kinsbursky wake_up(&pipe->waitq); 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds static void 8165f27f38SDavid Howells rpc_timeout_upcall_queue(struct work_struct *work) 821da177e4SLinus Torvalds { 839842ef35STrond Myklebust LIST_HEAD(free_list); 84ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = 85ba9e0975SStanislav Kinsbursky container_of(work, struct rpc_pipe, queue_timeout.work); 869842ef35STrond Myklebust void (*destroy_msg)(struct rpc_pipe_msg *); 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 } 94ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 95ba9e0975SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 98c1225158SPeng Tao ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, 99c1225158SPeng Tao char __user *dst, size_t buflen) 100c1225158SPeng Tao { 101c1225158SPeng Tao char *data = (char *)msg->data + msg->copied; 102c1225158SPeng Tao size_t mlen = min(msg->len - msg->copied, buflen); 103c1225158SPeng Tao unsigned long left; 104c1225158SPeng Tao 105c1225158SPeng Tao left = copy_to_user(dst, data, mlen); 106c1225158SPeng Tao if (left == mlen) { 107c1225158SPeng Tao msg->errno = -EFAULT; 108c1225158SPeng Tao return -EFAULT; 109c1225158SPeng Tao } 110c1225158SPeng Tao 111c1225158SPeng Tao mlen -= left; 112c1225158SPeng Tao msg->copied += mlen; 113c1225158SPeng Tao msg->errno = 0; 114c1225158SPeng Tao return mlen; 115c1225158SPeng Tao } 116c1225158SPeng Tao EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 117c1225158SPeng Tao 11893a44a75SJ. Bruce Fields /** 1191a5778aaSBen Hutchings * rpc_queue_upcall - queue an upcall message to userspace 12093a44a75SJ. Bruce Fields * @inode: inode of upcall pipe on which to queue given message 12193a44a75SJ. Bruce Fields * @msg: message to queue 12293a44a75SJ. Bruce Fields * 12393a44a75SJ. Bruce Fields * Call with an @inode created by rpc_mkpipe() to queue an upcall. 12493a44a75SJ. Bruce Fields * A userspace process may then later read the upcall by performing a 12593a44a75SJ. Bruce Fields * read on an open file for this inode. It is up to the caller to 12693a44a75SJ. Bruce Fields * initialize the fields of @msg (other than @msg->list) appropriately. 12793a44a75SJ. Bruce Fields */ 1281da177e4SLinus Torvalds int 129d706ed1fSStanislav Kinsbursky rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) 1301da177e4SLinus Torvalds { 1316070fe6fSTrond Myklebust int res = -EPIPE; 1321da177e4SLinus Torvalds 133d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 134d0fe13baSStanislav Kinsbursky if (pipe->nreaders) { 135d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 136d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1376070fe6fSTrond Myklebust res = 0; 138d0fe13baSStanislav Kinsbursky } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { 139d0fe13baSStanislav Kinsbursky if (list_empty(&pipe->pipe)) 14024c5d9d7STrond Myklebust queue_delayed_work(rpciod_workqueue, 141d0fe13baSStanislav Kinsbursky &pipe->queue_timeout, 1421da177e4SLinus Torvalds RPC_UPCALL_TIMEOUT); 143d0fe13baSStanislav Kinsbursky list_add_tail(&msg->list, &pipe->pipe); 144d0fe13baSStanislav Kinsbursky pipe->pipelen += msg->len; 1456070fe6fSTrond Myklebust res = 0; 1466070fe6fSTrond Myklebust } 147d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 148d0fe13baSStanislav Kinsbursky wake_up(&pipe->waitq); 1491da177e4SLinus Torvalds return res; 1501da177e4SLinus Torvalds } 151468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_queue_upcall); 1521da177e4SLinus Torvalds 1536070fe6fSTrond Myklebust static inline void 1546070fe6fSTrond Myklebust rpc_inode_setowner(struct inode *inode, void *private) 1556070fe6fSTrond Myklebust { 1566070fe6fSTrond Myklebust RPC_I(inode)->private = private; 1576070fe6fSTrond Myklebust } 1586070fe6fSTrond Myklebust 1591da177e4SLinus Torvalds static void 1601da177e4SLinus Torvalds rpc_close_pipes(struct inode *inode) 1611da177e4SLinus Torvalds { 162ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 163e712804aS\"J. Bruce Fields\ int need_release; 164ad6b1340SStanislav Kinsbursky LIST_HEAD(free_list); 1651da177e4SLinus Torvalds 1661b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 167ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 168ba9e0975SStanislav Kinsbursky need_release = pipe->nreaders != 0 || pipe->nwriters != 0; 169ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 170ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->in_upcall, &free_list); 171ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 172ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 173ad6b1340SStanislav Kinsbursky pipe->dentry = NULL; 174ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 175ad6b1340SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, pipe->ops->destroy_msg, -EPIPE); 176ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 177ad6b1340SStanislav Kinsbursky if (need_release && pipe->ops->release_pipe) 178ad6b1340SStanislav Kinsbursky pipe->ops->release_pipe(inode); 179ba9e0975SStanislav Kinsbursky cancel_delayed_work_sync(&pipe->queue_timeout); 1806070fe6fSTrond Myklebust rpc_inode_setowner(inode, NULL); 1811b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds static struct inode * 1851da177e4SLinus Torvalds rpc_alloc_inode(struct super_block *sb) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds struct rpc_inode *rpci; 188e94b1766SChristoph Lameter rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); 1891da177e4SLinus Torvalds if (!rpci) 1901da177e4SLinus Torvalds return NULL; 1911da177e4SLinus Torvalds return &rpci->vfs_inode; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds static void 195fa0d7e3dSNick Piggin rpc_i_callback(struct rcu_head *head) 196fa0d7e3dSNick Piggin { 197fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 198fa0d7e3dSNick Piggin kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); 199fa0d7e3dSNick Piggin } 200fa0d7e3dSNick Piggin 201fa0d7e3dSNick Piggin static void 2021da177e4SLinus Torvalds rpc_destroy_inode(struct inode *inode) 2031da177e4SLinus Torvalds { 204fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, rpc_i_callback); 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds static int 2081da177e4SLinus Torvalds rpc_pipe_open(struct inode *inode, struct file *filp) 2091da177e4SLinus Torvalds { 210d0fe13baSStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 211c3810608S\"J. Bruce Fields\ int first_open; 2121da177e4SLinus Torvalds int res = -ENXIO; 2131da177e4SLinus Torvalds 2141b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 215ad6b1340SStanislav Kinsbursky if (pipe->dentry == NULL) 216c3810608S\"J. Bruce Fields\ goto out; 217d0fe13baSStanislav Kinsbursky first_open = pipe->nreaders == 0 && pipe->nwriters == 0; 218d0fe13baSStanislav Kinsbursky if (first_open && pipe->ops->open_pipe) { 219d0fe13baSStanislav Kinsbursky res = pipe->ops->open_pipe(inode); 220c3810608S\"J. Bruce Fields\ if (res) 221c3810608S\"J. Bruce Fields\ goto out; 222c3810608S\"J. Bruce Fields\ } 2231da177e4SLinus Torvalds if (filp->f_mode & FMODE_READ) 224d0fe13baSStanislav Kinsbursky pipe->nreaders++; 2251da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 226d0fe13baSStanislav Kinsbursky pipe->nwriters++; 2271da177e4SLinus Torvalds res = 0; 228c3810608S\"J. Bruce Fields\ out: 2291b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2301da177e4SLinus Torvalds return res; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds static int 2341da177e4SLinus Torvalds rpc_pipe_release(struct inode *inode, struct file *filp) 2351da177e4SLinus Torvalds { 236ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 2371da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 238e712804aS\"J. Bruce Fields\ int last_close; 2391da177e4SLinus Torvalds 2401b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 241ad6b1340SStanislav Kinsbursky if (pipe->dentry == NULL) 2421da177e4SLinus Torvalds goto out; 243655b5bb4SJoe Perches msg = filp->private_data; 2441da177e4SLinus Torvalds if (msg != NULL) { 245ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 24648e49187STrond Myklebust msg->errno = -EAGAIN; 2475a67657aSTrond Myklebust list_del_init(&msg->list); 248ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 249ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg(msg); 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 252ba9e0975SStanislav Kinsbursky pipe->nwriters --; 2539842ef35STrond Myklebust if (filp->f_mode & FMODE_READ) { 254ba9e0975SStanislav Kinsbursky pipe->nreaders --; 255ba9e0975SStanislav Kinsbursky if (pipe->nreaders == 0) { 2569842ef35STrond Myklebust LIST_HEAD(free_list); 257ba9e0975SStanislav Kinsbursky spin_lock(&pipe->lock); 258ba9e0975SStanislav Kinsbursky list_splice_init(&pipe->pipe, &free_list); 259ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 260ba9e0975SStanislav Kinsbursky spin_unlock(&pipe->lock); 261ba9e0975SStanislav Kinsbursky rpc_purge_list(pipe, &free_list, 262ba9e0975SStanislav Kinsbursky pipe->ops->destroy_msg, -EAGAIN); 2639842ef35STrond Myklebust } 2649842ef35STrond Myklebust } 265ba9e0975SStanislav Kinsbursky last_close = pipe->nwriters == 0 && pipe->nreaders == 0; 266ba9e0975SStanislav Kinsbursky if (last_close && pipe->ops->release_pipe) 267ba9e0975SStanislav Kinsbursky pipe->ops->release_pipe(inode); 2681da177e4SLinus Torvalds out: 2691b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 2701da177e4SLinus Torvalds return 0; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds static ssize_t 2741da177e4SLinus Torvalds rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) 2751da177e4SLinus Torvalds { 276303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 277d0fe13baSStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 2781da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 2791da177e4SLinus Torvalds int res = 0; 2801da177e4SLinus Torvalds 2811b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 282ad6b1340SStanislav Kinsbursky if (pipe->dentry == NULL) { 2831da177e4SLinus Torvalds res = -EPIPE; 2841da177e4SLinus Torvalds goto out_unlock; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds msg = filp->private_data; 2871da177e4SLinus Torvalds if (msg == NULL) { 288d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 289d0fe13baSStanislav Kinsbursky if (!list_empty(&pipe->pipe)) { 290d0fe13baSStanislav Kinsbursky msg = list_entry(pipe->pipe.next, 2911da177e4SLinus Torvalds struct rpc_pipe_msg, 2921da177e4SLinus Torvalds list); 293d0fe13baSStanislav Kinsbursky list_move(&msg->list, &pipe->in_upcall); 294d0fe13baSStanislav Kinsbursky pipe->pipelen -= msg->len; 2951da177e4SLinus Torvalds filp->private_data = msg; 2961da177e4SLinus Torvalds msg->copied = 0; 2971da177e4SLinus Torvalds } 298d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 2991da177e4SLinus Torvalds if (msg == NULL) 3001da177e4SLinus Torvalds goto out_unlock; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds /* NOTE: it is up to the callback to update msg->copied */ 303d0fe13baSStanislav Kinsbursky res = pipe->ops->upcall(filp, msg, buf, len); 3041da177e4SLinus Torvalds if (res < 0 || msg->len == msg->copied) { 3051da177e4SLinus Torvalds filp->private_data = NULL; 306d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 3075a67657aSTrond Myklebust list_del_init(&msg->list); 308d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 309d0fe13baSStanislav Kinsbursky pipe->ops->destroy_msg(msg); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds out_unlock: 3121b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3131da177e4SLinus Torvalds return res; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds static ssize_t 3171da177e4SLinus Torvalds rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) 3181da177e4SLinus Torvalds { 319303b46bbSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 320d0fe13baSStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 3211da177e4SLinus Torvalds int res; 3221da177e4SLinus Torvalds 3231b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 3241da177e4SLinus Torvalds res = -EPIPE; 325ad6b1340SStanislav Kinsbursky if (pipe->dentry != NULL) 326d0fe13baSStanislav Kinsbursky res = pipe->ops->downcall(filp, buf, len); 3271b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 3281da177e4SLinus Torvalds return res; 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds static unsigned int 3321da177e4SLinus Torvalds rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) 3331da177e4SLinus Torvalds { 334d0fe13baSStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe; 3351da177e4SLinus Torvalds unsigned int mask = 0; 3361da177e4SLinus Torvalds 337d0fe13baSStanislav Kinsbursky poll_wait(filp, &pipe->waitq, wait); 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds mask = POLLOUT | POLLWRNORM; 340ad6b1340SStanislav Kinsbursky if (pipe->dentry == NULL) 3411da177e4SLinus Torvalds mask |= POLLERR | POLLHUP; 342d0fe13baSStanislav Kinsbursky if (filp->private_data || !list_empty(&pipe->pipe)) 3431da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 3441da177e4SLinus Torvalds return mask; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 347a6f8dbc6SArnd Bergmann static long 348a6f8dbc6SArnd Bergmann rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 3491da177e4SLinus Torvalds { 350a6f8dbc6SArnd Bergmann struct inode *inode = filp->f_path.dentry->d_inode; 351d0fe13baSStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 3521da177e4SLinus Torvalds int len; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds switch (cmd) { 3551da177e4SLinus Torvalds case FIONREAD: 356d0fe13baSStanislav Kinsbursky spin_lock(&pipe->lock); 357ad6b1340SStanislav Kinsbursky if (pipe->dentry == NULL) { 358d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3591da177e4SLinus Torvalds return -EPIPE; 360a6f8dbc6SArnd Bergmann } 361d0fe13baSStanislav Kinsbursky len = pipe->pipelen; 3621da177e4SLinus Torvalds if (filp->private_data) { 3631da177e4SLinus Torvalds struct rpc_pipe_msg *msg; 364655b5bb4SJoe Perches msg = filp->private_data; 3651da177e4SLinus Torvalds len += msg->len - msg->copied; 3661da177e4SLinus Torvalds } 367d0fe13baSStanislav Kinsbursky spin_unlock(&pipe->lock); 3681da177e4SLinus Torvalds return put_user(len, (int __user *)arg); 3691da177e4SLinus Torvalds default: 3701da177e4SLinus Torvalds return -EINVAL; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 374da7071d7SArjan van de Ven static const struct file_operations rpc_pipe_fops = { 3751da177e4SLinus Torvalds .owner = THIS_MODULE, 3761da177e4SLinus Torvalds .llseek = no_llseek, 3771da177e4SLinus Torvalds .read = rpc_pipe_read, 3781da177e4SLinus Torvalds .write = rpc_pipe_write, 3791da177e4SLinus Torvalds .poll = rpc_pipe_poll, 380674b604cSFrederic Weisbecker .unlocked_ioctl = rpc_pipe_ioctl, 3811da177e4SLinus Torvalds .open = rpc_pipe_open, 3821da177e4SLinus Torvalds .release = rpc_pipe_release, 3831da177e4SLinus Torvalds }; 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds static int 3861da177e4SLinus Torvalds rpc_show_info(struct seq_file *m, void *v) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds struct rpc_clnt *clnt = m->private; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds seq_printf(m, "RPC server: %s\n", clnt->cl_server); 3911da177e4SLinus Torvalds seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, 3921da177e4SLinus Torvalds clnt->cl_prog, clnt->cl_vers); 393e7f78657SChuck Lever seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); 394e7f78657SChuck Lever seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); 395bf19aaceSJ. Bruce Fields seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); 3961da177e4SLinus Torvalds return 0; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds static int 4001da177e4SLinus Torvalds rpc_info_open(struct inode *inode, struct file *file) 4011da177e4SLinus Torvalds { 402006abe88STrond Myklebust struct rpc_clnt *clnt = NULL; 4031da177e4SLinus Torvalds int ret = single_open(file, rpc_show_info, NULL); 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds if (!ret) { 4061da177e4SLinus Torvalds struct seq_file *m = file->private_data; 407006abe88STrond Myklebust 408006abe88STrond Myklebust spin_lock(&file->f_path.dentry->d_lock); 409006abe88STrond Myklebust if (!d_unhashed(file->f_path.dentry)) 4101da177e4SLinus Torvalds clnt = RPC_I(inode)->private; 411006abe88STrond Myklebust if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { 412006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4131da177e4SLinus Torvalds m->private = clnt; 4141da177e4SLinus Torvalds } else { 415006abe88STrond Myklebust spin_unlock(&file->f_path.dentry->d_lock); 4161da177e4SLinus Torvalds single_release(inode, file); 4171da177e4SLinus Torvalds ret = -EINVAL; 4181da177e4SLinus Torvalds } 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds return ret; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds static int 4241da177e4SLinus Torvalds rpc_info_release(struct inode *inode, struct file *file) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds struct seq_file *m = file->private_data; 4271da177e4SLinus Torvalds struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds if (clnt) 4301da177e4SLinus Torvalds rpc_release_client(clnt); 4311da177e4SLinus Torvalds return single_release(inode, file); 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds 434da7071d7SArjan van de Ven static const struct file_operations rpc_info_operations = { 4351da177e4SLinus Torvalds .owner = THIS_MODULE, 4361da177e4SLinus Torvalds .open = rpc_info_open, 4371da177e4SLinus Torvalds .read = seq_read, 4381da177e4SLinus Torvalds .llseek = seq_lseek, 4391da177e4SLinus Torvalds .release = rpc_info_release, 4401da177e4SLinus Torvalds }; 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * Description of fs contents. 4451da177e4SLinus Torvalds */ 4461da177e4SLinus Torvalds struct rpc_filelist { 447ac6feceeSTrond Myklebust const char *name; 44899ac48f5SArjan van de Ven const struct file_operations *i_fop; 4497364af6aSTrond Myklebust umode_t mode; 4501da177e4SLinus Torvalds }; 4511da177e4SLinus Torvalds 45254281548STrond Myklebust struct vfsmount *rpc_get_mount(void) 4531da177e4SLinus Torvalds { 45454281548STrond Myklebust int err; 45554281548STrond Myklebust 456fc14f2feSAl Viro err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); 45754281548STrond Myklebust if (err != 0) 45854281548STrond Myklebust return ERR_PTR(err); 459fc14f2feSAl Viro return rpc_mnt; 4601da177e4SLinus Torvalds } 461e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_get_mount); 4621da177e4SLinus Torvalds 46354281548STrond Myklebust void rpc_put_mount(void) 4641da177e4SLinus Torvalds { 465fc14f2feSAl Viro simple_release_fs(&rpc_mnt, &rpc_mount_count); 4661da177e4SLinus Torvalds } 467e571cbf1STrond Myklebust EXPORT_SYMBOL_GPL(rpc_put_mount); 4681da177e4SLinus Torvalds 469fe15ce44SNick Piggin static int rpc_delete_dentry(const struct dentry *dentry) 47062e1761cSTrond Myklebust { 47162e1761cSTrond Myklebust return 1; 47262e1761cSTrond Myklebust } 47362e1761cSTrond Myklebust 4743ba13d17SAl Viro static const struct dentry_operations rpc_dentry_operations = { 47562e1761cSTrond Myklebust .d_delete = rpc_delete_dentry, 47662e1761cSTrond Myklebust }; 47762e1761cSTrond Myklebust 4781da177e4SLinus Torvalds static struct inode * 4797364af6aSTrond Myklebust rpc_get_inode(struct super_block *sb, umode_t mode) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds struct inode *inode = new_inode(sb); 4821da177e4SLinus Torvalds if (!inode) 4831da177e4SLinus Torvalds return NULL; 48485fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4851da177e4SLinus Torvalds inode->i_mode = mode; 4861da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4871da177e4SLinus Torvalds switch (mode & S_IFMT) { 4881da177e4SLinus Torvalds case S_IFDIR: 4891da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4901da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 491d8c76e6fSDave Hansen inc_nlink(inode); 4921da177e4SLinus Torvalds default: 4931da177e4SLinus Torvalds break; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds return inode; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4987589806eSTrond Myklebust static int __rpc_create_common(struct inode *dir, struct dentry *dentry, 4997589806eSTrond Myklebust umode_t mode, 5007589806eSTrond Myklebust const struct file_operations *i_fop, 5017589806eSTrond Myklebust void *private) 5027589806eSTrond Myklebust { 5037589806eSTrond Myklebust struct inode *inode; 5047589806eSTrond Myklebust 505beb0f0a9STrond Myklebust d_drop(dentry); 5067589806eSTrond Myklebust inode = rpc_get_inode(dir->i_sb, mode); 5077589806eSTrond Myklebust if (!inode) 5087589806eSTrond Myklebust goto out_err; 5097589806eSTrond Myklebust inode->i_ino = iunique(dir->i_sb, 100); 5107589806eSTrond Myklebust if (i_fop) 5117589806eSTrond Myklebust inode->i_fop = i_fop; 5127589806eSTrond Myklebust if (private) 5137589806eSTrond Myklebust rpc_inode_setowner(inode, private); 5147589806eSTrond Myklebust d_add(dentry, inode); 5157589806eSTrond Myklebust return 0; 5167589806eSTrond Myklebust out_err: 5177589806eSTrond Myklebust printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", 5187589806eSTrond Myklebust __FILE__, __func__, dentry->d_name.name); 5197589806eSTrond Myklebust dput(dentry); 5207589806eSTrond Myklebust return -ENOMEM; 5217589806eSTrond Myklebust } 5227589806eSTrond Myklebust 523ac6feceeSTrond Myklebust static int __rpc_create(struct inode *dir, struct dentry *dentry, 524ac6feceeSTrond Myklebust umode_t mode, 525ac6feceeSTrond Myklebust const struct file_operations *i_fop, 526ac6feceeSTrond Myklebust void *private) 527ac6feceeSTrond Myklebust { 528ac6feceeSTrond Myklebust int err; 529ac6feceeSTrond Myklebust 530ac6feceeSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); 531ac6feceeSTrond Myklebust if (err) 532ac6feceeSTrond Myklebust return err; 533ac6feceeSTrond Myklebust fsnotify_create(dir, dentry); 534ac6feceeSTrond Myklebust return 0; 535ac6feceeSTrond Myklebust } 536ac6feceeSTrond Myklebust 5377589806eSTrond Myklebust static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, 5387589806eSTrond Myklebust umode_t mode, 5397589806eSTrond Myklebust const struct file_operations *i_fop, 5407589806eSTrond Myklebust void *private) 5417589806eSTrond Myklebust { 5427589806eSTrond Myklebust int err; 5437589806eSTrond Myklebust 5447589806eSTrond Myklebust err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); 5457589806eSTrond Myklebust if (err) 5467589806eSTrond Myklebust return err; 5477589806eSTrond Myklebust inc_nlink(dir); 5487589806eSTrond Myklebust fsnotify_mkdir(dir, dentry); 5497589806eSTrond Myklebust return 0; 5507589806eSTrond Myklebust } 5517589806eSTrond Myklebust 552ba9e0975SStanislav Kinsbursky static void 553ba9e0975SStanislav Kinsbursky init_pipe(struct rpc_pipe *pipe) 554ba9e0975SStanislav Kinsbursky { 555ba9e0975SStanislav Kinsbursky pipe->nreaders = 0; 556ba9e0975SStanislav Kinsbursky pipe->nwriters = 0; 557ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_upcall); 558ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->in_downcall); 559ba9e0975SStanislav Kinsbursky INIT_LIST_HEAD(&pipe->pipe); 560ba9e0975SStanislav Kinsbursky pipe->pipelen = 0; 561ba9e0975SStanislav Kinsbursky init_waitqueue_head(&pipe->waitq); 562ba9e0975SStanislav Kinsbursky INIT_DELAYED_WORK(&pipe->queue_timeout, 563ba9e0975SStanislav Kinsbursky rpc_timeout_upcall_queue); 564ba9e0975SStanislav Kinsbursky pipe->ops = NULL; 565ba9e0975SStanislav Kinsbursky spin_lock_init(&pipe->lock); 566c239d83bSStanislav Kinsbursky pipe->dentry = NULL; 567ba9e0975SStanislav Kinsbursky } 568ba9e0975SStanislav Kinsbursky 569c239d83bSStanislav Kinsbursky void rpc_destroy_pipe_data(struct rpc_pipe *pipe) 570c239d83bSStanislav Kinsbursky { 571c239d83bSStanislav Kinsbursky kfree(pipe); 572c239d83bSStanislav Kinsbursky } 573c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); 574c239d83bSStanislav Kinsbursky 575c239d83bSStanislav Kinsbursky struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) 5767589806eSTrond Myklebust { 577ba9e0975SStanislav Kinsbursky struct rpc_pipe *pipe; 5787589806eSTrond Myklebust 579ba9e0975SStanislav Kinsbursky pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); 580ba9e0975SStanislav Kinsbursky if (!pipe) 581c239d83bSStanislav Kinsbursky return ERR_PTR(-ENOMEM); 582ba9e0975SStanislav Kinsbursky init_pipe(pipe); 583c239d83bSStanislav Kinsbursky pipe->ops = ops; 584c239d83bSStanislav Kinsbursky pipe->flags = flags; 585c239d83bSStanislav Kinsbursky return pipe; 586ba9e0975SStanislav Kinsbursky } 587c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_data); 588c239d83bSStanislav Kinsbursky 589c239d83bSStanislav Kinsbursky static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, 590c239d83bSStanislav Kinsbursky umode_t mode, 591c239d83bSStanislav Kinsbursky const struct file_operations *i_fop, 592c239d83bSStanislav Kinsbursky void *private, 593c239d83bSStanislav Kinsbursky struct rpc_pipe *pipe) 594c239d83bSStanislav Kinsbursky { 595c239d83bSStanislav Kinsbursky struct rpc_inode *rpci; 596c239d83bSStanislav Kinsbursky int err; 597c239d83bSStanislav Kinsbursky 598c239d83bSStanislav Kinsbursky err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); 599c239d83bSStanislav Kinsbursky if (err) 600c239d83bSStanislav Kinsbursky return err; 6017589806eSTrond Myklebust rpci = RPC_I(dentry->d_inode); 6027589806eSTrond Myklebust rpci->private = private; 603ba9e0975SStanislav Kinsbursky rpci->pipe = pipe; 6047589806eSTrond Myklebust fsnotify_create(dir, dentry); 6057589806eSTrond Myklebust return 0; 6067589806eSTrond Myklebust } 6077589806eSTrond Myklebust 608ac6feceeSTrond Myklebust static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) 609ac6feceeSTrond Myklebust { 610ac6feceeSTrond Myklebust int ret; 611ac6feceeSTrond Myklebust 612ac6feceeSTrond Myklebust dget(dentry); 613ac6feceeSTrond Myklebust ret = simple_rmdir(dir, dentry); 614ac6feceeSTrond Myklebust d_delete(dentry); 615ac6feceeSTrond Myklebust dput(dentry); 616ac6feceeSTrond Myklebust return ret; 617ac6feceeSTrond Myklebust } 618ac6feceeSTrond Myklebust 619eee17325SStanislav Kinsbursky int rpc_rmdir(struct dentry *dentry) 620eee17325SStanislav Kinsbursky { 621eee17325SStanislav Kinsbursky struct dentry *parent; 622eee17325SStanislav Kinsbursky struct inode *dir; 623eee17325SStanislav Kinsbursky int error; 624eee17325SStanislav Kinsbursky 625eee17325SStanislav Kinsbursky parent = dget_parent(dentry); 626eee17325SStanislav Kinsbursky dir = parent->d_inode; 627eee17325SStanislav Kinsbursky mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 628eee17325SStanislav Kinsbursky error = __rpc_rmdir(dir, dentry); 629eee17325SStanislav Kinsbursky mutex_unlock(&dir->i_mutex); 630eee17325SStanislav Kinsbursky dput(parent); 631eee17325SStanislav Kinsbursky return error; 632eee17325SStanislav Kinsbursky } 633eee17325SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_rmdir); 634eee17325SStanislav Kinsbursky 635810d90bcSTrond Myklebust static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 636810d90bcSTrond Myklebust { 637810d90bcSTrond Myklebust int ret; 638810d90bcSTrond Myklebust 639810d90bcSTrond Myklebust dget(dentry); 640810d90bcSTrond Myklebust ret = simple_unlink(dir, dentry); 641810d90bcSTrond Myklebust d_delete(dentry); 642810d90bcSTrond Myklebust dput(dentry); 643810d90bcSTrond Myklebust return ret; 644810d90bcSTrond Myklebust } 645810d90bcSTrond Myklebust 646810d90bcSTrond Myklebust static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) 647810d90bcSTrond Myklebust { 648810d90bcSTrond Myklebust struct inode *inode = dentry->d_inode; 649810d90bcSTrond Myklebust 650810d90bcSTrond Myklebust rpc_close_pipes(inode); 651810d90bcSTrond Myklebust return __rpc_unlink(dir, dentry); 652810d90bcSTrond Myklebust } 653810d90bcSTrond Myklebust 654cfeaa4a3STrond Myklebust static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 655cfeaa4a3STrond Myklebust struct qstr *name) 656cfeaa4a3STrond Myklebust { 657cfeaa4a3STrond Myklebust struct dentry *dentry; 658cfeaa4a3STrond Myklebust 6595bff0386SStanislav Kinsbursky dentry = d_lookup(parent, name); 6605bff0386SStanislav Kinsbursky if (!dentry) { 6615bff0386SStanislav Kinsbursky dentry = d_alloc(parent, name); 6625bff0386SStanislav Kinsbursky if (!dentry) 6635bff0386SStanislav Kinsbursky return ERR_PTR(-ENOMEM); 6645bff0386SStanislav Kinsbursky } 6655bff0386SStanislav Kinsbursky if (dentry->d_inode == NULL) { 6665bff0386SStanislav Kinsbursky d_set_d_op(dentry, &rpc_dentry_operations); 667f1f0abe1SDan Carpenter return dentry; 6685bff0386SStanislav Kinsbursky } 669cfeaa4a3STrond Myklebust dput(dentry); 670cfeaa4a3STrond Myklebust return ERR_PTR(-EEXIST); 671cfeaa4a3STrond Myklebust } 672cfeaa4a3STrond Myklebust 6731da177e4SLinus Torvalds /* 6741da177e4SLinus Torvalds * FIXME: This probably has races. 6751da177e4SLinus Torvalds */ 676ac6feceeSTrond Myklebust static void __rpc_depopulate(struct dentry *parent, 677ac6feceeSTrond Myklebust const struct rpc_filelist *files, 678ac6feceeSTrond Myklebust int start, int eof) 6791da177e4SLinus Torvalds { 6801da177e4SLinus Torvalds struct inode *dir = parent->d_inode; 681ac6feceeSTrond Myklebust struct dentry *dentry; 682ac6feceeSTrond Myklebust struct qstr name; 683ac6feceeSTrond Myklebust int i; 684ac6feceeSTrond Myklebust 685ac6feceeSTrond Myklebust for (i = start; i < eof; i++) { 686ac6feceeSTrond Myklebust name.name = files[i].name; 687ac6feceeSTrond Myklebust name.len = strlen(files[i].name); 688ac6feceeSTrond Myklebust name.hash = full_name_hash(name.name, name.len); 689ac6feceeSTrond Myklebust dentry = d_lookup(parent, &name); 690ac6feceeSTrond Myklebust 691ac6feceeSTrond Myklebust if (dentry == NULL) 692ac6feceeSTrond Myklebust continue; 693ac6feceeSTrond Myklebust if (dentry->d_inode == NULL) 694ac6feceeSTrond Myklebust goto next; 695ac6feceeSTrond Myklebust switch (dentry->d_inode->i_mode & S_IFMT) { 696ac6feceeSTrond Myklebust default: 697ac6feceeSTrond Myklebust BUG(); 698ac6feceeSTrond Myklebust case S_IFREG: 699ac6feceeSTrond Myklebust __rpc_unlink(dir, dentry); 700ac6feceeSTrond Myklebust break; 701ac6feceeSTrond Myklebust case S_IFDIR: 702ac6feceeSTrond Myklebust __rpc_rmdir(dir, dentry); 703ac6feceeSTrond Myklebust } 704ac6feceeSTrond Myklebust next: 705ac6feceeSTrond Myklebust dput(dentry); 706ac6feceeSTrond Myklebust } 707ac6feceeSTrond Myklebust } 708ac6feceeSTrond Myklebust 709ac6feceeSTrond Myklebust static void rpc_depopulate(struct dentry *parent, 710ac6feceeSTrond Myklebust const struct rpc_filelist *files, 711ac6feceeSTrond Myklebust int start, int eof) 712ac6feceeSTrond Myklebust { 713ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7141da177e4SLinus Torvalds 715c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); 716ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7171b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7181da177e4SLinus Torvalds } 7191da177e4SLinus Torvalds 720ac6feceeSTrond Myklebust static int rpc_populate(struct dentry *parent, 721ac6feceeSTrond Myklebust const struct rpc_filelist *files, 722ac6feceeSTrond Myklebust int start, int eof, 723ac6feceeSTrond Myklebust void *private) 7241da177e4SLinus Torvalds { 725ac6feceeSTrond Myklebust struct inode *dir = parent->d_inode; 7261da177e4SLinus Torvalds struct dentry *dentry; 727ac6feceeSTrond Myklebust int i, err; 7281da177e4SLinus Torvalds 7291b1dcc1bSJes Sorensen mutex_lock(&dir->i_mutex); 7301da177e4SLinus Torvalds for (i = start; i < eof; i++) { 731ac6feceeSTrond Myklebust struct qstr q; 732ac6feceeSTrond Myklebust 733ac6feceeSTrond Myklebust q.name = files[i].name; 734ac6feceeSTrond Myklebust q.len = strlen(files[i].name); 735ac6feceeSTrond Myklebust q.hash = full_name_hash(q.name, q.len); 736ac6feceeSTrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, &q); 737ac6feceeSTrond Myklebust err = PTR_ERR(dentry); 738ac6feceeSTrond Myklebust if (IS_ERR(dentry)) 7391da177e4SLinus Torvalds goto out_bad; 740ac6feceeSTrond Myklebust switch (files[i].mode & S_IFMT) { 741ac6feceeSTrond Myklebust default: 742ac6feceeSTrond Myklebust BUG(); 743ac6feceeSTrond Myklebust case S_IFREG: 744ac6feceeSTrond Myklebust err = __rpc_create(dir, dentry, 745ac6feceeSTrond Myklebust files[i].mode, 746ac6feceeSTrond Myklebust files[i].i_fop, 747ac6feceeSTrond Myklebust private); 748ac6feceeSTrond Myklebust break; 749ac6feceeSTrond Myklebust case S_IFDIR: 750ac6feceeSTrond Myklebust err = __rpc_mkdir(dir, dentry, 751ac6feceeSTrond Myklebust files[i].mode, 752ac6feceeSTrond Myklebust NULL, 753ac6feceeSTrond Myklebust private); 7541da177e4SLinus Torvalds } 755ac6feceeSTrond Myklebust if (err != 0) 756ac6feceeSTrond Myklebust goto out_bad; 7571da177e4SLinus Torvalds } 7581b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7591da177e4SLinus Torvalds return 0; 7601da177e4SLinus Torvalds out_bad: 761ac6feceeSTrond Myklebust __rpc_depopulate(parent, files, start, eof); 7621b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7631da177e4SLinus Torvalds printk(KERN_WARNING "%s: %s failed to populate directory %s\n", 7640dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name); 765ac6feceeSTrond Myklebust return err; 766f134585aSTrond Myklebust } 767f134585aSTrond Myklebust 768e57aed77STrond Myklebust static struct dentry *rpc_mkdir_populate(struct dentry *parent, 769e57aed77STrond Myklebust struct qstr *name, umode_t mode, void *private, 770e57aed77STrond Myklebust int (*populate)(struct dentry *, void *), void *args_populate) 771f134585aSTrond Myklebust { 772f134585aSTrond Myklebust struct dentry *dentry; 7737d59d1e8STrond Myklebust struct inode *dir = parent->d_inode; 774f134585aSTrond Myklebust int error; 775f134585aSTrond Myklebust 7767d59d1e8STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 7777d59d1e8STrond Myklebust dentry = __rpc_lookup_create_exclusive(parent, name); 778f134585aSTrond Myklebust if (IS_ERR(dentry)) 7797d59d1e8STrond Myklebust goto out; 7807d59d1e8STrond Myklebust error = __rpc_mkdir(dir, dentry, mode, NULL, private); 7817589806eSTrond Myklebust if (error != 0) 7827589806eSTrond Myklebust goto out_err; 783e57aed77STrond Myklebust if (populate != NULL) { 784e57aed77STrond Myklebust error = populate(dentry, args_populate); 785f134585aSTrond Myklebust if (error) 786ac6feceeSTrond Myklebust goto err_rmdir; 787e57aed77STrond Myklebust } 788f134585aSTrond Myklebust out: 7891b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 7905c3e985aSTrond Myklebust return dentry; 791ac6feceeSTrond Myklebust err_rmdir: 792f134585aSTrond Myklebust __rpc_rmdir(dir, dentry); 7937589806eSTrond Myklebust out_err: 794f134585aSTrond Myklebust dentry = ERR_PTR(error); 795f134585aSTrond Myklebust goto out; 796f134585aSTrond Myklebust } 797f134585aSTrond Myklebust 798e57aed77STrond Myklebust static int rpc_rmdir_depopulate(struct dentry *dentry, 799e57aed77STrond Myklebust void (*depopulate)(struct dentry *)) 800f134585aSTrond Myklebust { 801dff02cc1STrond Myklebust struct dentry *parent; 802f134585aSTrond Myklebust struct inode *dir; 803f134585aSTrond Myklebust int error; 804f134585aSTrond Myklebust 805dff02cc1STrond Myklebust parent = dget_parent(dentry); 806dff02cc1STrond Myklebust dir = parent->d_inode; 807c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 808e57aed77STrond Myklebust if (depopulate != NULL) 809e57aed77STrond Myklebust depopulate(dentry); 810f134585aSTrond Myklebust error = __rpc_rmdir(dir, dentry); 8111b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 812dff02cc1STrond Myklebust dput(parent); 813f134585aSTrond Myklebust return error; 814f134585aSTrond Myklebust } 8151da177e4SLinus Torvalds 81693a44a75SJ. Bruce Fields /** 81793a44a75SJ. Bruce Fields * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication 81893a44a75SJ. Bruce Fields * @parent: dentry of directory to create new "pipe" in 81993a44a75SJ. Bruce Fields * @name: name of pipe 82093a44a75SJ. Bruce Fields * @private: private data to associate with the pipe, for the caller's use 82193a44a75SJ. Bruce Fields * @ops: operations defining the behavior of the pipe: upcall, downcall, 822c3810608S\"J. Bruce Fields\ * release_pipe, open_pipe, and destroy_msg. 823d0fe13baSStanislav Kinsbursky * @flags: rpc_pipe flags 82493a44a75SJ. Bruce Fields * 82593a44a75SJ. Bruce Fields * Data is made available for userspace to read by calls to 82693a44a75SJ. Bruce Fields * rpc_queue_upcall(). The actual reads will result in calls to 82793a44a75SJ. Bruce Fields * @ops->upcall, which will be called with the file pointer, 82893a44a75SJ. Bruce Fields * message, and userspace buffer to copy to. 82993a44a75SJ. Bruce Fields * 83093a44a75SJ. Bruce Fields * Writes can come at any time, and do not necessarily have to be 83193a44a75SJ. Bruce Fields * responses to upcalls. They will result in calls to @msg->downcall. 83293a44a75SJ. Bruce Fields * 83393a44a75SJ. Bruce Fields * The @private argument passed here will be available to all these methods 83493a44a75SJ. Bruce Fields * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. 83593a44a75SJ. Bruce Fields */ 836c239d83bSStanislav Kinsbursky struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, 837c239d83bSStanislav Kinsbursky void *private, struct rpc_pipe *pipe) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds struct dentry *dentry; 8407589806eSTrond Myklebust struct inode *dir = parent->d_inode; 8417364af6aSTrond Myklebust umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; 842cfeaa4a3STrond Myklebust struct qstr q; 8437589806eSTrond Myklebust int err; 8447364af6aSTrond Myklebust 845c239d83bSStanislav Kinsbursky if (pipe->ops->upcall == NULL) 8467364af6aSTrond Myklebust umode &= ~S_IRUGO; 847c239d83bSStanislav Kinsbursky if (pipe->ops->downcall == NULL) 8487364af6aSTrond Myklebust umode &= ~S_IWUGO; 8491da177e4SLinus Torvalds 850cfeaa4a3STrond Myklebust q.name = name; 851cfeaa4a3STrond Myklebust q.len = strlen(name); 852cfeaa4a3STrond Myklebust q.hash = full_name_hash(q.name, q.len), 853cfeaa4a3STrond Myklebust 854cfeaa4a3STrond Myklebust mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 8555bff0386SStanislav Kinsbursky dentry = __rpc_lookup_create_exclusive(parent, &q); 8561da177e4SLinus Torvalds if (IS_ERR(dentry)) 857cfeaa4a3STrond Myklebust goto out; 858c239d83bSStanislav Kinsbursky err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, 859c239d83bSStanislav Kinsbursky private, pipe); 8607589806eSTrond Myklebust if (err) 8617589806eSTrond Myklebust goto out_err; 862f134585aSTrond Myklebust out: 8631b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8645c3e985aSTrond Myklebust return dentry; 8657589806eSTrond Myklebust out_err: 8667589806eSTrond Myklebust dentry = ERR_PTR(err); 867158998b6STrond Myklebust printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", 8680dc47877SHarvey Harrison __FILE__, __func__, parent->d_name.name, name, 8697589806eSTrond Myklebust err); 870f134585aSTrond Myklebust goto out; 8711da177e4SLinus Torvalds } 872c239d83bSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); 8731da177e4SLinus Torvalds 87493a44a75SJ. Bruce Fields /** 87593a44a75SJ. Bruce Fields * rpc_unlink - remove a pipe 87693a44a75SJ. Bruce Fields * @dentry: dentry for the pipe, as returned from rpc_mkpipe 87793a44a75SJ. Bruce Fields * 87893a44a75SJ. Bruce Fields * After this call, lookups will no longer find the pipe, and any 87993a44a75SJ. Bruce Fields * attempts to read or write using preexisting opens of the pipe will 88093a44a75SJ. Bruce Fields * return -EPIPE. 88193a44a75SJ. Bruce Fields */ 882f134585aSTrond Myklebust int 8835d67476fSTrond Myklebust rpc_unlink(struct dentry *dentry) 8841da177e4SLinus Torvalds { 8855d67476fSTrond Myklebust struct dentry *parent; 886f134585aSTrond Myklebust struct inode *dir; 8875d67476fSTrond Myklebust int error = 0; 8881da177e4SLinus Torvalds 8895d67476fSTrond Myklebust parent = dget_parent(dentry); 8905d67476fSTrond Myklebust dir = parent->d_inode; 891c6573c29SArjan van de Ven mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 892810d90bcSTrond Myklebust error = __rpc_rmpipe(dir, dentry); 8931b1dcc1bSJes Sorensen mutex_unlock(&dir->i_mutex); 8945d67476fSTrond Myklebust dput(parent); 895f134585aSTrond Myklebust return error; 8961da177e4SLinus Torvalds } 897468039eeSTrond Myklebust EXPORT_SYMBOL_GPL(rpc_unlink); 8981da177e4SLinus Torvalds 899e57aed77STrond Myklebust enum { 900e57aed77STrond Myklebust RPCAUTH_info, 901e57aed77STrond Myklebust RPCAUTH_EOF 902e57aed77STrond Myklebust }; 903e57aed77STrond Myklebust 904e57aed77STrond Myklebust static const struct rpc_filelist authfiles[] = { 905e57aed77STrond Myklebust [RPCAUTH_info] = { 906e57aed77STrond Myklebust .name = "info", 907e57aed77STrond Myklebust .i_fop = &rpc_info_operations, 908e57aed77STrond Myklebust .mode = S_IFREG | S_IRUSR, 909e57aed77STrond Myklebust }, 910e57aed77STrond Myklebust }; 911e57aed77STrond Myklebust 912e57aed77STrond Myklebust static int rpc_clntdir_populate(struct dentry *dentry, void *private) 913e57aed77STrond Myklebust { 914e57aed77STrond Myklebust return rpc_populate(dentry, 915e57aed77STrond Myklebust authfiles, RPCAUTH_info, RPCAUTH_EOF, 916e57aed77STrond Myklebust private); 917e57aed77STrond Myklebust } 918e57aed77STrond Myklebust 919e57aed77STrond Myklebust static void rpc_clntdir_depopulate(struct dentry *dentry) 920e57aed77STrond Myklebust { 921e57aed77STrond Myklebust rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); 922e57aed77STrond Myklebust } 923e57aed77STrond Myklebust 9247d59d1e8STrond Myklebust /** 9257d59d1e8STrond Myklebust * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs 9264111d4fdSRandy Dunlap * @dentry: dentry from the rpc_pipefs root to the new directory 9274111d4fdSRandy Dunlap * @name: &struct qstr for the name 9287d59d1e8STrond Myklebust * @rpc_client: rpc client to associate with this directory 9297d59d1e8STrond Myklebust * 9307d59d1e8STrond Myklebust * This creates a directory at the given @path associated with 9317d59d1e8STrond Myklebust * @rpc_clnt, which will contain a file named "info" with some basic 9327d59d1e8STrond Myklebust * information about the client, together with any "pipes" that may 9337d59d1e8STrond Myklebust * later be created using rpc_mkpipe(). 9347d59d1e8STrond Myklebust */ 93523ac6581STrond Myklebust struct dentry *rpc_create_client_dir(struct dentry *dentry, 93623ac6581STrond Myklebust struct qstr *name, 9377d59d1e8STrond Myklebust struct rpc_clnt *rpc_client) 9387d59d1e8STrond Myklebust { 939e57aed77STrond Myklebust return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, 940e57aed77STrond Myklebust rpc_clntdir_populate, rpc_client); 941e57aed77STrond Myklebust } 942e57aed77STrond Myklebust 943e57aed77STrond Myklebust /** 944e57aed77STrond Myklebust * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() 94580df9d20SStanislav Kinsbursky * @clnt: rpc client 946e57aed77STrond Myklebust */ 947e57aed77STrond Myklebust int rpc_remove_client_dir(struct dentry *dentry) 948e57aed77STrond Myklebust { 949e57aed77STrond Myklebust return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); 9507d59d1e8STrond Myklebust } 9517d59d1e8STrond Myklebust 9528854e82dSTrond Myklebust static const struct rpc_filelist cache_pipefs_files[3] = { 9538854e82dSTrond Myklebust [0] = { 9548854e82dSTrond Myklebust .name = "channel", 9558854e82dSTrond Myklebust .i_fop = &cache_file_operations_pipefs, 95696c61cbdSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9578854e82dSTrond Myklebust }, 9588854e82dSTrond Myklebust [1] = { 9598854e82dSTrond Myklebust .name = "content", 9608854e82dSTrond Myklebust .i_fop = &content_file_operations_pipefs, 9618854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR, 9628854e82dSTrond Myklebust }, 9638854e82dSTrond Myklebust [2] = { 9648854e82dSTrond Myklebust .name = "flush", 9658854e82dSTrond Myklebust .i_fop = &cache_flush_operations_pipefs, 9668854e82dSTrond Myklebust .mode = S_IFREG|S_IRUSR|S_IWUSR, 9678854e82dSTrond Myklebust }, 9688854e82dSTrond Myklebust }; 9698854e82dSTrond Myklebust 9708854e82dSTrond Myklebust static int rpc_cachedir_populate(struct dentry *dentry, void *private) 9718854e82dSTrond Myklebust { 9728854e82dSTrond Myklebust return rpc_populate(dentry, 9738854e82dSTrond Myklebust cache_pipefs_files, 0, 3, 9748854e82dSTrond Myklebust private); 9758854e82dSTrond Myklebust } 9768854e82dSTrond Myklebust 9778854e82dSTrond Myklebust static void rpc_cachedir_depopulate(struct dentry *dentry) 9788854e82dSTrond Myklebust { 9798854e82dSTrond Myklebust rpc_depopulate(dentry, cache_pipefs_files, 0, 3); 9808854e82dSTrond Myklebust } 9818854e82dSTrond Myklebust 9828854e82dSTrond Myklebust struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, 98364f1426fSAl Viro umode_t umode, struct cache_detail *cd) 9848854e82dSTrond Myklebust { 9858854e82dSTrond Myklebust return rpc_mkdir_populate(parent, name, umode, NULL, 9868854e82dSTrond Myklebust rpc_cachedir_populate, cd); 9878854e82dSTrond Myklebust } 9888854e82dSTrond Myklebust 9898854e82dSTrond Myklebust void rpc_remove_cache_dir(struct dentry *dentry) 9908854e82dSTrond Myklebust { 9918854e82dSTrond Myklebust rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); 9928854e82dSTrond Myklebust } 9938854e82dSTrond Myklebust 9941da177e4SLinus Torvalds /* 9951da177e4SLinus Torvalds * populate the filesystem 9961da177e4SLinus Torvalds */ 997b87221deSAlexey Dobriyan static const struct super_operations s_ops = { 9981da177e4SLinus Torvalds .alloc_inode = rpc_alloc_inode, 9991da177e4SLinus Torvalds .destroy_inode = rpc_destroy_inode, 10001da177e4SLinus Torvalds .statfs = simple_statfs, 10011da177e4SLinus Torvalds }; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds #define RPCAUTH_GSSMAGIC 0x67596969 10041da177e4SLinus Torvalds 1005bb156749STrond Myklebust /* 1006bb156749STrond Myklebust * We have a single directory with 1 node in it. 1007bb156749STrond Myklebust */ 1008bb156749STrond Myklebust enum { 1009bb156749STrond Myklebust RPCAUTH_lockd, 1010bb156749STrond Myklebust RPCAUTH_mount, 1011bb156749STrond Myklebust RPCAUTH_nfs, 1012bb156749STrond Myklebust RPCAUTH_portmap, 1013bb156749STrond Myklebust RPCAUTH_statd, 1014bb156749STrond Myklebust RPCAUTH_nfsd4_cb, 1015e571cbf1STrond Myklebust RPCAUTH_cache, 1016bb156749STrond Myklebust RPCAUTH_RootEOF 1017bb156749STrond Myklebust }; 1018bb156749STrond Myklebust 1019bb156749STrond Myklebust static const struct rpc_filelist files[] = { 1020bb156749STrond Myklebust [RPCAUTH_lockd] = { 1021bb156749STrond Myklebust .name = "lockd", 1022bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1023bb156749STrond Myklebust }, 1024bb156749STrond Myklebust [RPCAUTH_mount] = { 1025bb156749STrond Myklebust .name = "mount", 1026bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1027bb156749STrond Myklebust }, 1028bb156749STrond Myklebust [RPCAUTH_nfs] = { 1029bb156749STrond Myklebust .name = "nfs", 1030bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1031bb156749STrond Myklebust }, 1032bb156749STrond Myklebust [RPCAUTH_portmap] = { 1033bb156749STrond Myklebust .name = "portmap", 1034bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1035bb156749STrond Myklebust }, 1036bb156749STrond Myklebust [RPCAUTH_statd] = { 1037bb156749STrond Myklebust .name = "statd", 1038bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1039bb156749STrond Myklebust }, 1040bb156749STrond Myklebust [RPCAUTH_nfsd4_cb] = { 1041bb156749STrond Myklebust .name = "nfsd4_cb", 1042bb156749STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1043bb156749STrond Myklebust }, 1044e571cbf1STrond Myklebust [RPCAUTH_cache] = { 1045e571cbf1STrond Myklebust .name = "cache", 1046e571cbf1STrond Myklebust .mode = S_IFDIR | S_IRUGO | S_IXUGO, 1047e571cbf1STrond Myklebust }, 1048bb156749STrond Myklebust }; 1049bb156749STrond Myklebust 1050432eb1a5SStanislav Kinsbursky /* 1051432eb1a5SStanislav Kinsbursky * This call can be used only in RPC pipefs mount notification hooks. 1052432eb1a5SStanislav Kinsbursky */ 1053432eb1a5SStanislav Kinsbursky struct dentry *rpc_d_lookup_sb(const struct super_block *sb, 1054432eb1a5SStanislav Kinsbursky const unsigned char *dir_name) 1055432eb1a5SStanislav Kinsbursky { 1056432eb1a5SStanislav Kinsbursky struct qstr dir = { 1057432eb1a5SStanislav Kinsbursky .name = dir_name, 1058432eb1a5SStanislav Kinsbursky .len = strlen(dir_name), 1059432eb1a5SStanislav Kinsbursky .hash = full_name_hash(dir_name, strlen(dir_name)), 1060432eb1a5SStanislav Kinsbursky }; 1061432eb1a5SStanislav Kinsbursky 1062432eb1a5SStanislav Kinsbursky return d_lookup(sb->s_root, &dir); 1063432eb1a5SStanislav Kinsbursky } 1064432eb1a5SStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 1065432eb1a5SStanislav Kinsbursky 1066c21a588fSStanislav Kinsbursky void rpc_pipefs_init_net(struct net *net) 1067c21a588fSStanislav Kinsbursky { 1068c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1069c21a588fSStanislav Kinsbursky 1070c21a588fSStanislav Kinsbursky mutex_init(&sn->pipefs_sb_lock); 1071c21a588fSStanislav Kinsbursky } 1072c21a588fSStanislav Kinsbursky 1073c21a588fSStanislav Kinsbursky /* 1074c21a588fSStanislav Kinsbursky * This call will be used for per network namespace operations calls. 1075c21a588fSStanislav Kinsbursky * Note: Function will be returned with pipefs_sb_lock taken if superblock was 1076c21a588fSStanislav Kinsbursky * found. This lock have to be released by rpc_put_sb_net() when all operations 1077c21a588fSStanislav Kinsbursky * will be completed. 1078c21a588fSStanislav Kinsbursky */ 1079c21a588fSStanislav Kinsbursky struct super_block *rpc_get_sb_net(const struct net *net) 1080c21a588fSStanislav Kinsbursky { 1081c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1082c21a588fSStanislav Kinsbursky 1083c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 1084c21a588fSStanislav Kinsbursky if (sn->pipefs_sb) 1085c21a588fSStanislav Kinsbursky return sn->pipefs_sb; 1086c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1087c21a588fSStanislav Kinsbursky return NULL; 1088c21a588fSStanislav Kinsbursky } 1089c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_get_sb_net); 1090c21a588fSStanislav Kinsbursky 1091c21a588fSStanislav Kinsbursky void rpc_put_sb_net(const struct net *net) 1092c21a588fSStanislav Kinsbursky { 1093c21a588fSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1094c21a588fSStanislav Kinsbursky 1095c21a588fSStanislav Kinsbursky BUG_ON(sn->pipefs_sb == NULL); 1096c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1097c21a588fSStanislav Kinsbursky } 1098c21a588fSStanislav Kinsbursky EXPORT_SYMBOL_GPL(rpc_put_sb_net); 1099c21a588fSStanislav Kinsbursky 11001da177e4SLinus Torvalds static int 11011da177e4SLinus Torvalds rpc_fill_super(struct super_block *sb, void *data, int silent) 11021da177e4SLinus Torvalds { 11031da177e4SLinus Torvalds struct inode *inode; 11041da177e4SLinus Torvalds struct dentry *root; 110538b0da75SStanislav Kinsbursky struct net *net = data; 110690c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 11072d00131aSStanislav Kinsbursky int err; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds sb->s_blocksize = PAGE_CACHE_SIZE; 11101da177e4SLinus Torvalds sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 11111da177e4SLinus Torvalds sb->s_magic = RPCAUTH_GSSMAGIC; 11121da177e4SLinus Torvalds sb->s_op = &s_ops; 11131da177e4SLinus Torvalds sb->s_time_gran = 1; 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds inode = rpc_get_inode(sb, S_IFDIR | 0755); 11161da177e4SLinus Torvalds if (!inode) 11171da177e4SLinus Torvalds return -ENOMEM; 1118fc7bed8cSAl Viro sb->s_root = root = d_alloc_root(inode); 11191da177e4SLinus Torvalds if (!root) { 11201da177e4SLinus Torvalds iput(inode); 11211da177e4SLinus Torvalds return -ENOMEM; 11221da177e4SLinus Torvalds } 1123ac6feceeSTrond Myklebust if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) 11241da177e4SLinus Torvalds return -ENOMEM; 1125efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, 1126efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11272d00131aSStanislav Kinsbursky err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11282d00131aSStanislav Kinsbursky RPC_PIPEFS_MOUNT, 11292d00131aSStanislav Kinsbursky sb); 11302d00131aSStanislav Kinsbursky if (err) 11312d00131aSStanislav Kinsbursky goto err_depopulate; 1132021c68deSStanislav Kinsbursky sb->s_fs_info = get_net(net); 113390c4e829SStanislav Kinsbursky sn->pipefs_sb = sb; 1134fc7bed8cSAl Viro return 0; 11352d00131aSStanislav Kinsbursky 11362d00131aSStanislav Kinsbursky err_depopulate: 11372d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11382d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11392d00131aSStanislav Kinsbursky sb); 11402d00131aSStanislav Kinsbursky __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); 11412d00131aSStanislav Kinsbursky return err; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds 1144fc14f2feSAl Viro static struct dentry * 1145fc14f2feSAl Viro rpc_mount(struct file_system_type *fs_type, 1146fc14f2feSAl Viro int flags, const char *dev_name, void *data) 11471da177e4SLinus Torvalds { 114838b0da75SStanislav Kinsbursky return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 1151021c68deSStanislav Kinsbursky void rpc_kill_sb(struct super_block *sb) 1152021c68deSStanislav Kinsbursky { 1153021c68deSStanislav Kinsbursky struct net *net = sb->s_fs_info; 115490c4e829SStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1155021c68deSStanislav Kinsbursky 1156c21a588fSStanislav Kinsbursky mutex_lock(&sn->pipefs_sb_lock); 115790c4e829SStanislav Kinsbursky sn->pipefs_sb = NULL; 1158c21a588fSStanislav Kinsbursky mutex_unlock(&sn->pipefs_sb_lock); 1159021c68deSStanislav Kinsbursky put_net(net); 1160efc46bf2SStanislav Kinsbursky dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, 1161efc46bf2SStanislav Kinsbursky NET_NAME(net)); 11622d00131aSStanislav Kinsbursky blocking_notifier_call_chain(&rpc_pipefs_notifier_list, 11632d00131aSStanislav Kinsbursky RPC_PIPEFS_UMOUNT, 11642d00131aSStanislav Kinsbursky sb); 1165021c68deSStanislav Kinsbursky kill_litter_super(sb); 1166021c68deSStanislav Kinsbursky } 1167021c68deSStanislav Kinsbursky 11681da177e4SLinus Torvalds static struct file_system_type rpc_pipe_fs_type = { 11691da177e4SLinus Torvalds .owner = THIS_MODULE, 11701da177e4SLinus Torvalds .name = "rpc_pipefs", 1171fc14f2feSAl Viro .mount = rpc_mount, 1172021c68deSStanislav Kinsbursky .kill_sb = rpc_kill_sb, 11731da177e4SLinus Torvalds }; 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds static void 117651cc5068SAlexey Dobriyan init_once(void *foo) 11771da177e4SLinus Torvalds { 11781da177e4SLinus Torvalds struct rpc_inode *rpci = (struct rpc_inode *) foo; 11791da177e4SLinus Torvalds 11801da177e4SLinus Torvalds inode_init_once(&rpci->vfs_inode); 11811da177e4SLinus Torvalds rpci->private = NULL; 1182ba9e0975SStanislav Kinsbursky rpci->pipe = NULL; 11831da177e4SLinus Torvalds } 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds int register_rpc_pipefs(void) 11861da177e4SLinus Torvalds { 11875bd5f581SAkinobu Mita int err; 11885bd5f581SAkinobu Mita 11891da177e4SLinus Torvalds rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", 11901da177e4SLinus Torvalds sizeof(struct rpc_inode), 1191fffb60f9SPaul Jackson 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 1192fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 119320c2df83SPaul Mundt init_once); 11941da177e4SLinus Torvalds if (!rpc_inode_cachep) 11951da177e4SLinus Torvalds return -ENOMEM; 119680df9d20SStanislav Kinsbursky err = rpc_clients_notifier_register(); 119780df9d20SStanislav Kinsbursky if (err) 119880df9d20SStanislav Kinsbursky goto err_notifier; 11995bd5f581SAkinobu Mita err = register_filesystem(&rpc_pipe_fs_type); 120080df9d20SStanislav Kinsbursky if (err) 120180df9d20SStanislav Kinsbursky goto err_register; 120280df9d20SStanislav Kinsbursky return 0; 120380df9d20SStanislav Kinsbursky 120480df9d20SStanislav Kinsbursky err_register: 120580df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 120680df9d20SStanislav Kinsbursky err_notifier: 12075bd5f581SAkinobu Mita kmem_cache_destroy(rpc_inode_cachep); 12085bd5f581SAkinobu Mita return err; 12095bd5f581SAkinobu Mita } 12105bd5f581SAkinobu Mita 12111da177e4SLinus Torvalds void unregister_rpc_pipefs(void) 12121da177e4SLinus Torvalds { 121380df9d20SStanislav Kinsbursky rpc_clients_notifier_unregister(); 12141a1d92c1SAlexey Dobriyan kmem_cache_destroy(rpc_inode_cachep); 12151da177e4SLinus Torvalds unregister_filesystem(&rpc_pipe_fs_type); 12161da177e4SLinus Torvalds } 1217dcbf8c30SMichal Schmidt 1218dcbf8c30SMichal Schmidt /* Make 'mount -t rpc_pipefs ...' autoload this module. */ 1219dcbf8c30SMichal Schmidt MODULE_ALIAS("rpc_pipefs"); 1220