| /* |
| * net/sunrpc/rpc_pipe.c |
| * |
| * Userland/kernel interface for rpcauth_gss. |
| * Code shamelessly plagiarized from fs/nfsd/nfsctl.c |
| * and fs/sysfs/inode.c |
| * |
| * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> |
| * |
| */ |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/pagemap.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/fsnotify.h> |
| #include <linux/kernel.h> |
| #include <linux/rcupdate.h> |
| #include <linux/utsname.h> |
| |
| #include <asm/ioctls.h> |
| #include <linux/poll.h> |
| #include <linux/wait.h> |
| #include <linux/seq_file.h> |
| |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/workqueue.h> |
| #include <linux/sunrpc/rpc_pipe_fs.h> |
| #include <linux/sunrpc/cache.h> |
| #include <linux/nsproxy.h> |
| #include <linux/notifier.h> |
| |
| #include "netns.h" |
| #include "sunrpc.h" |
| |
| #define RPCDBG_FACILITY RPCDBG_DEBUG |
| |
| #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") |
| |
| static struct file_system_type rpc_pipe_fs_type; |
| static const struct rpc_pipe_ops gssd_dummy_pipe_ops; |
| |
| static struct kmem_cache *rpc_inode_cachep __read_mostly; |
| |
| #define RPC_UPCALL_TIMEOUT (30*HZ) |
| |
| static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
| |
| int rpc_pipefs_notifier_register(struct notifier_block *nb) |
| { |
| return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); |
| } |
| EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); |
| |
| void rpc_pipefs_notifier_unregister(struct notifier_block *nb) |
| { |
| blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); |
| } |
| EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); |
| |
| static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, |
| void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
| { |
| struct rpc_pipe_msg *msg; |
| |
| if (list_empty(head)) |
| return; |
| do { |
| msg = list_entry(head->next, struct rpc_pipe_msg, list); |
| list_del_init(&msg->list); |
| msg->errno = err; |
| destroy_msg(msg); |
| } while (!list_empty(head)); |
| |
| if (waitq) |
| wake_up(waitq); |
| } |
| |
| static void |
| rpc_timeout_upcall_queue(struct work_struct *work) |
| { |
| LIST_HEAD(free_list); |
| struct rpc_pipe *pipe = |
| container_of(work, struct rpc_pipe, queue_timeout.work); |
| void (*destroy_msg)(struct rpc_pipe_msg *); |
| struct dentry *dentry; |
| |
| spin_lock(&pipe->lock); |
| destroy_msg = pipe->ops->destroy_msg; |
| if (pipe->nreaders == 0) { |
| list_splice_init(&pipe->pipe, &free_list); |
| pipe->pipelen = 0; |
| } |
| dentry = dget(pipe->dentry); |
| spin_unlock(&pipe->lock); |
| rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL, |
| &free_list, destroy_msg, -ETIMEDOUT); |
| dput(dentry); |
| } |
| |
| ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
| char __user *dst, size_t buflen) |
| { |
| char *data = (char *)msg->data + msg->copied; |
| size_t mlen = min(msg->len - msg->copied, buflen); |
| unsigned long left; |
| |
| left = copy_to_user(dst, data, mlen); |
| if (left == mlen) { |
| msg->errno = -EFAULT; |
| return -EFAULT; |
| } |
| |
| mlen -= left; |
| msg->copied += mlen; |
| msg->errno = 0; |
| return mlen; |
| } |
| EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); |
| |
| /** |
| * rpc_queue_upcall - queue an upcall message to userspace |
| * @pipe: upcall pipe on which to queue given message |
| * @msg: message to queue |
| * |
| * Call with an @inode created by rpc_mkpipe() to queue an upcall. |
| * A userspace process may then later read the upcall by performing a |
| * read on an open file for this inode. It is up to the caller to |
| * initialize the fields of @msg (other than @msg->list) appropriately. |
| */ |
| int |
| rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
| { |
| int res = -EPIPE; |
| struct dentry *dentry; |
| |
| spin_lock(&pipe->lock); |
| if (pipe->nreaders) { |
| list_add_tail(&msg->list, &pipe->pipe); |
| pipe->pipelen += msg->len; |
| res = 0; |
| } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
| if (list_empty(&pipe->pipe)) |
| queue_delayed_work(rpciod_workqueue, |
| &pipe->queue_timeout, |
| RPC_UPCALL_TIMEOUT); |
| list_add_tail(&msg->list, &pipe->pipe); |
| pipe->pipelen += msg->len; |
| res = 0; |
| } |
| dentry = dget(pipe->dentry); |
| spin_unlock(&pipe->lock); |
| if (dentry) { |
| wake_up(&RPC_I(d_inode(dentry))->waitq); |
| dput(dentry); |
| } |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
| |
| static inline void |
| rpc_inode_setowner(struct inode *inode, void *private) |
| { |
| RPC_I(inode)->private = private; |
| } |
| |
| static void |
| rpc_close_pipes(struct inode *inode) |
| { |
| struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
| int need_release; |
| LIST_HEAD(free_list); |
| |
| mutex_lock(&inode->i_mutex); |
| spin_lock(&pipe->lock); |
| need_release = pipe->nreaders != 0 || pipe->nwriters != 0; |
| pipe->nreaders = 0; |
| list_splice_init(&pipe->in_upcall, &free_list); |
| list_splice_init(&pipe->pipe, &free_list); |
| pipe->pipelen = 0; |
| pipe->dentry = NULL; |
| spin_unlock(&pipe->lock); |
| rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); |
| pipe->nwriters = 0; |
| if (need_release && pipe->ops->release_pipe) |
| pipe->ops->release_pipe(inode); |
| cancel_delayed_work_sync(&pipe->queue_timeout); |
| rpc_inode_setowner(inode, NULL); |
| RPC_I(inode)->pipe = NULL; |
| mutex_unlock(&inode->i_mutex); |
| } |
| |
| static struct inode * |
| rpc_alloc_inode(struct super_block *sb) |
| { |
| struct rpc_inode *rpci; |
| rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
| if (!rpci) |
| return NULL; |
| return &rpci->vfs_inode; |
| } |
| |
| static void |
| rpc_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
| } |
| |
| static void |
| rpc_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, rpc_i_callback); |
| } |
| |
| static int |
| rpc_pipe_open(struct inode *inode, struct file *filp) |
| { |
| struct rpc_pipe *pipe; |
| int first_open; |
| int res = -ENXIO; |
| |
| mutex_lock(&inode->i_mutex); |
| pipe = RPC_I(inode)->pipe; |
| if (pipe == NULL) |
| goto out; |
| first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
| if (first_open && pipe->ops->open_pipe) { |
| res = pipe->ops->open_pipe(inode); |
| if (res) |
| goto out; |
| } |
| if (filp->f_mode & FMODE_READ) |
| pipe->nreaders++; |
| if (filp->f_mode & FMODE_WRITE) |
| pipe->nwriters++; |
| res = 0; |
| out: |
| mutex_unlock(&inode->i_mutex); |
| return res; |
| } |
| |
| static int |
| rpc_pipe_release(struct inode *inode, struct file *filp) |
| { |
| struct rpc_pipe *pipe; |
| struct rpc_pipe_msg *msg; |
| int last_close; |
| |
| mutex_lock(&inode->i_mutex); |
| pipe = RPC_I(inode)->pipe; |
| if (pipe == NULL) |
| goto out; |
| msg = filp->private_data; |
| if (msg != NULL) { |
| spin_lock(&pipe->lock); |
| msg->errno = -EAGAIN; |
| list_del_init(&msg->list); |
| spin_unlock(&pipe->lock); |
| pipe->ops->destroy_msg(msg); |
| } |
| if (filp->f_mode & FMODE_WRITE) |
| pipe->nwriters --; |
| if (filp->f_mode & FMODE_READ) { |
| pipe->nreaders --; |
| if (pipe->nreaders == 0) { |
| LIST_HEAD(free_list); |
| spin_lock(&pipe->lock); |
| list_splice_init(&pipe->pipe, &free_list); |
| pipe->pipelen = 0; |
| spin_unlock(&pipe->lock); |
| rpc_purge_list(&RPC_I(inode)->waitq, &free_list, |
| pipe->ops->destroy_msg, -EAGAIN); |
| } |
| } |
| last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
| if (last_close && pipe->ops->release_pipe) |
| pipe->ops->release_pipe(inode); |
| out: |
| mutex_unlock(&inode->i_mutex); |
| return 0; |
| } |
| |
| static ssize_t |
| rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) |
| { |
| struct inode *inode = file_inode(filp); |
| struct rpc_pipe *pipe; |
| struct rpc_pipe_msg *msg; |
| int res = 0; |
| |
| mutex_lock(&inode->i_mutex); |
| pipe = RPC_I(inode)->pipe; |
| if (pipe == NULL) { |
| res = -EPIPE; |
| goto out_unlock; |
| } |
| msg = filp->private_data; |
| if (msg == NULL) { |
| spin_lock(&pipe->lock); |
| if (!list_empty(&pipe->pipe)) { |
| msg = list_entry(pipe->pipe.next, |
| struct rpc_pipe_msg, |
| list); |
| list_move(&msg->list, &pipe->in_upcall); |
| pipe->pipelen -= msg->len; |
| filp->private_data = msg; |
| msg->copied = 0; |
| } |
| spin_unlock(&pipe->lock); |
| if (msg == NULL) |
| goto out_unlock; |
| } |
| /* NOTE: it is up to the callback to update msg->copied */ |
| res = pipe->ops->upcall(filp, msg, buf, len); |
| if (res < 0 || msg->len == msg->copied) { |
| filp->private_data = NULL; |
| spin_lock(&pipe->lock); |
| list_del_init(&msg->list); |
| spin_unlock(&pipe->lock); |
| pipe->ops->destroy_msg(msg); |
| } |
| out_unlock: |
| mutex_unlock(&inode->i_mutex); |
| return res; |
| } |
| |
| static ssize_t |
| rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) |
| { |
| struct inode *inode = file_inode(filp); |
| int res; |
| |
| mutex_lock(&inode->i_mutex); |
| res = -EPIPE; |
| if (RPC_I(inode)->pipe != NULL) |
| res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); |
| mutex_unlock(&inode->i_mutex); |
| return res; |
| } |
| |
| static unsigned int |
| rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) |
| { |
| struct inode *inode = file_inode(filp); |
| struct rpc_inode *rpci = RPC_I(inode); |
| unsigned int mask = POLLOUT | POLLWRNORM; |
| |
| poll_wait(filp, &rpci->waitq, wait); |
| |
| mutex_lock(&inode->i_mutex); |
| if (rpci->pipe == NULL) |
| mask |= POLLERR | POLLHUP; |
| else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
| mask |= POLLIN | POLLRDNORM; |
| mutex_unlock(&inode->i_mutex); |
| return mask; |
| } |
| |
| static long |
| rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| struct inode *inode = file_inode(filp); |
| struct rpc_pipe *pipe; |
| int len; |
| |
| switch (cmd) { |
| case FIONREAD: |
| mutex_lock(&inode->i_mutex); |
| pipe = RPC_I(inode)->pipe; |
| if (pipe == NULL) { |
| mutex_unlock(&inode->i_mutex); |
| return -EPIPE; |
| } |
| spin_lock(&pipe->lock); |
| len = pipe->pipelen; |
| if (filp->private_data) { |
| struct rpc_pipe_msg *msg; |
| msg = filp->private_data; |
| len += msg->len - msg->copied; |
| } |
| spin_unlock(&pipe->lock); |
| mutex_unlock(&inode->i_mutex); |
| return put_user(len, (int __user *)arg); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct file_operations rpc_pipe_fops = { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .read = rpc_pipe_read, |
| .write = rpc_pipe_write, |
| .poll = rpc_pipe_poll, |
| .unlocked_ioctl = rpc_pipe_ioctl, |
| .open = rpc_pipe_open, |
| .release = rpc_pipe_release, |
| }; |
| |
| static int |
| rpc_show_info(struct seq_file *m, void *v) |
| { |
| struct rpc_clnt *clnt = m->private; |
| |
| rcu_read_lock(); |
| seq_printf(m, "RPC server: %s\n", |
| rcu_dereference(clnt->cl_xprt)->servername); |
| seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, |
| clnt->cl_prog, clnt->cl_vers); |
| seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
| seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); |
| seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| static int |
| rpc_info_open(struct inode *inode, struct file *file) |
| { |
| struct rpc_clnt *clnt = NULL; |
| int ret = single_open(file, rpc_show_info, NULL); |
| |
| if (!ret) { |
| struct seq_file *m = file->private_data; |
| |
| spin_lock(&file->f_path.dentry->d_lock); |
| if (!d_unhashed(file->f_path.dentry)) |
| clnt = RPC_I(inode)->private; |
| if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { |
| spin_unlock(&file->f_path.dentry->d_lock); |
| m->private = clnt; |
| } else { |
| spin_unlock(&file->f_path.dentry->d_lock); |
| single_release(inode, file); |
| ret = -EINVAL; |
| } |
| } |
| return ret; |
| } |
| |
| static int |
| rpc_info_release(struct inode *inode, struct file *file) |
| { |
| struct seq_file *m = file->private_data; |
| struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; |
| |
| if (clnt) |
| rpc_release_client(clnt); |
| return single_release(inode, file); |
| } |
| |
| static const struct file_operations rpc_info_operations = { |
| .owner = THIS_MODULE, |
| .open = rpc_info_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = rpc_info_release, |
| }; |
| |
| |
| /* |
| * Description of fs contents. |
| */ |
| struct rpc_filelist { |
| const char *name; |
| const struct file_operations *i_fop; |
| umode_t mode; |
| }; |
| |
| static struct inode * |
| rpc_get_inode(struct super_block *sb, umode_t mode) |
| { |
| struct inode *inode = new_inode(sb); |
| if (!inode) |
| return NULL; |
| inode->i_ino = get_next_ino(); |
| inode->i_mode = mode; |
| inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| switch (mode & S_IFMT) { |
| case S_IFDIR: |
| inode->i_fop = &simple_dir_operations; |
| inode->i_op = &simple_dir_inode_operations; |
| inc_nlink(inode); |
| default: |
| break; |
| } |
| return inode; |
| } |
| |
| static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
| umode_t mode, |
| const struct file_operations *i_fop, |
| void *private) |
| { |
| struct inode *inode; |
| |
| d_drop(dentry); |
| inode = rpc_get_inode(dir->i_sb, mode); |
| if (!inode) |
| goto out_err; |
| inode->i_ino = iunique(dir->i_sb, 100); |
| if (i_fop) |
| inode->i_fop = i_fop; |
| if (private) |
| rpc_inode_setowner(inode, private); |
| d_add(dentry, inode); |
| return 0; |
| out_err: |
| printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", |
| __FILE__, __func__, dentry); |
| dput(dentry); |
| return -ENOMEM; |
| } |
| |
| static int __rpc_create(struct inode *dir, struct dentry *dentry, |
| umode_t mode, |
| const struct file_operations *i_fop, |
| void *private) |
| { |
| int err; |
| |
| err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); |
| if (err) |
| return err; |
| fsnotify_create(dir, dentry); |
| return 0; |
| } |
| |
| static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
| umode_t mode, |
| const struct file_operations *i_fop, |
| void *private) |
| { |
| int err; |
| |
| err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); |
| if (err) |
| return err; |
| inc_nlink(dir); |
| fsnotify_mkdir(dir, dentry); |
| return 0; |
| } |
| |
| static void |
| init_pipe(struct rpc_pipe *pipe) |
| { |
| pipe->nreaders = 0; |
| pipe->nwriters = 0; |
| INIT_LIST_HEAD(&pipe->in_upcall); |
| INIT_LIST_HEAD(&pipe->in_downcall); |
| INIT_LIST_HEAD(&pipe->pipe); |
| pipe->pipelen = 0; |
| INIT_DELAYED_WORK(&pipe->queue_timeout, |
| rpc_timeout_upcall_queue); |
| pipe->ops = NULL; |
| spin_lock_init(&pipe->lock); |
| pipe->dentry = NULL; |
| } |
| |
| void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
| { |
| kfree(pipe); |
| } |
| EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
| |
| struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
| { |
| struct rpc_pipe *pipe; |
| |
| pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
| if (!pipe) |
| return ERR_PTR(-ENOMEM); |
| init_pipe(pipe); |
| pipe->ops = ops; |
| pipe->flags = flags; |
| return pipe; |
| } |
| EXPORT_SYMBOL_GPL(rpc_mkpipe_data); |
| |
| static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, |
| umode_t mode, |
| const struct file_operations *i_fop, |
| void *private, |
| struct rpc_pipe *pipe) |
| { |
| struct rpc_inode *rpci; |
| int err; |
| |
| err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
| if (err) |
| return err; |
| rpci = RPC_I(d_inode(dentry)); |
| rpci->private = private; |
| rpci->pipe = pipe; |
| fsnotify_create(dir, dentry); |
| return 0; |
| } |
| |
| static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| int ret; |
| |
| dget(dentry); |
| ret = simple_rmdir(dir, dentry); |
| d_delete(dentry); |
| dput(dentry); |
| return ret; |
| } |
| |
| int rpc_rmdir(struct dentry *dentry) |
| { |
| struct dentry *parent; |
| struct inode *dir; |
| int error; |
| |
| parent = dget_parent(dentry); |
| dir = d_inode(parent); |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| error = __rpc_rmdir(dir, dentry); |
| mutex_unlock(&dir->i_mutex); |
| dput(parent); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(rpc_rmdir); |
| |
| static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| int ret; |
| |
| dget(dentry); |
| ret = simple_unlink(dir, dentry); |
| d_delete(dentry); |
| dput(dentry); |
| return ret; |
| } |
| |
| static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) |
| { |
| struct inode *inode = d_inode(dentry); |
| |
| rpc_close_pipes(inode); |
| return __rpc_unlink(dir, dentry); |
| } |
| |
| static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
| const char *name) |
| { |
| struct qstr q = QSTR_INIT(name, strlen(name)); |
| struct dentry *dentry = d_hash_and_lookup(parent, &q); |
| if (!dentry) { |
| dentry = d_alloc(parent, &q); |
| if (!dentry) |
| return ERR_PTR(-ENOMEM); |
| } |
| if (d_really_is_negative(dentry)) |
| return dentry; |
| dput(dentry); |
| return ERR_PTR(-EEXIST); |
| } |
| |
| /* |
| * FIXME: This probably has races. |
| */ |
| static void __rpc_depopulate(struct dentry *parent, |
| const struct rpc_filelist *files, |
| int start, int eof) |
| { |
| struct inode *dir = d_inode(parent); |
| struct dentry *dentry; |
| struct qstr name; |
| int i; |
| |
| for (i = start; i < eof; i++) { |
| name.name = files[i].name; |
| name.len = strlen(files[i].name); |
| dentry = d_hash_and_lookup(parent, &name); |
| |
| if (dentry == NULL) |
| continue; |
| if (d_really_is_negative(dentry)) |
| goto next; |
| switch (d_inode(dentry)->i_mode & S_IFMT) { |
| default: |
| BUG(); |
| case S_IFREG: |
| __rpc_unlink(dir, dentry); |
| break; |
| case S_IFDIR: |
| __rpc_rmdir(dir, dentry); |
| } |
| next: |
| dput(dentry); |
| } |
| } |
| |
| static void rpc_depopulate(struct dentry *parent, |
| const struct rpc_filelist *files, |
| int start, int eof) |
| { |
| struct inode *dir = d_inode(parent); |
| |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
| __rpc_depopulate(parent, files, start, eof); |
| mutex_unlock(&dir->i_mutex); |
| } |
| |
| static int rpc_populate(struct dentry *parent, |
| const struct rpc_filelist *files, |
| int start, int eof, |
| void *private) |
| { |
| struct inode *dir = d_inode(parent); |
| struct dentry *dentry; |
| int i, err; |
| |
| mutex_lock(&dir->i_mutex); |
| for (i = start; i < eof; i++) { |
| dentry = __rpc_lookup_create_exclusive(parent, files[i].name); |
| err = PTR_ERR(dentry); |
| if (IS_ERR(dentry)) |
| goto out_bad; |
| switch (files[i].mode & S_IFMT) { |
| default: |
| BUG(); |
| case S_IFREG: |
| err = __rpc_create(dir, dentry, |
| files[i].mode, |
| files[i].i_fop, |
| private); |
| break; |
| case S_IFDIR: |
| err = __rpc_mkdir(dir, dentry, |
| files[i].mode, |
| NULL, |
| private); |
| } |
| if (err != 0) |
| goto out_bad; |
| } |
| mutex_unlock(&dir->i_mutex); |
| return 0; |
| out_bad: |
| __rpc_depopulate(parent, files, start, eof); |
| mutex_unlock(&dir->i_mutex); |
| printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", |
| __FILE__, __func__, parent); |
| return err; |
| } |
| |
| static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
| const char *name, umode_t mode, void *private, |
| int (*populate)(struct dentry *, void *), void *args_populate) |
| { |
| struct dentry *dentry; |
| struct inode *dir = d_inode(parent); |
| int error; |
| |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| dentry = __rpc_lookup_create_exclusive(parent, name); |
| if (IS_ERR(dentry)) |
| goto out; |
| error = __rpc_mkdir(dir, dentry, mode, NULL, private); |
| if (error != 0) |
| goto out_err; |
| if (populate != NULL) { |
| error = populate(dentry, args_populate); |
| if (error) |
| goto err_rmdir; |
| } |
| out: |
| mutex_unlock(&dir->i_mutex); |
| return dentry; |
| err_rmdir: |
| __rpc_rmdir(dir, dentry); |
| out_err: |
| dentry = ERR_PTR(error); |
| goto out; |
| } |
| |
| static int rpc_rmdir_depopulate(struct dentry *dentry, |
| void (*depopulate)(struct dentry *)) |
| { |
| struct dentry *parent; |
| struct inode *dir; |
| int error; |
| |
| parent = dget_parent(dentry); |
| dir = d_inode(parent); |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| if (depopulate != NULL) |
| depopulate(dentry); |
| error = __rpc_rmdir(dir, dentry); |
| mutex_unlock(&dir->i_mutex); |
| dput(parent); |
| return error; |
| } |
| |
| /** |
| * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication |
| * @parent: dentry of directory to create new "pipe" in |
| * @name: name of pipe |
| * @private: private data to associate with the pipe, for the caller's use |
| * @pipe: &rpc_pipe containing input parameters |
| * |
| * Data is made available for userspace to read by calls to |
| * rpc_queue_upcall(). The actual reads will result in calls to |
| * @ops->upcall, which will be called with the file pointer, |
| * message, and userspace buffer to copy to. |
| * |
| * Writes can come at any time, and do not necessarily have to be |
| * responses to upcalls. They will result in calls to @msg->downcall. |
| * |
| * The @private argument passed here will be available to all these methods |
| * from the file pointer, via RPC_I(file_inode(file))->private. |
| */ |
| struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
| void *private, struct rpc_pipe *pipe) |
| { |
| struct dentry *dentry; |
| struct inode *dir = d_inode(parent); |
| umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
| int err; |
| |
| if (pipe->ops->upcall == NULL) |
| umode &= ~S_IRUGO; |
| if (pipe->ops->downcall == NULL) |
| umode &= ~S_IWUGO; |
| |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| dentry = __rpc_lookup_create_exclusive(parent, name); |
| if (IS_ERR(dentry)) |
| goto out; |
| err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
| private, pipe); |
| if (err) |
| goto out_err; |
| out: |
| mutex_unlock(&dir->i_mutex); |
| return dentry; |
| out_err: |
| dentry = ERR_PTR(err); |
| printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", |
| __FILE__, __func__, parent, name, |
| err); |
| goto out; |
| } |
| EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
| |
| /** |
| * rpc_unlink - remove a pipe |
| * @dentry: dentry for the pipe, as returned from rpc_mkpipe |
| * |
| * After this call, lookups will no longer find the pipe, and any |
| * attempts to read or write using preexisting opens of the pipe will |
| * return -EPIPE. |
| */ |
| int |
| rpc_unlink(struct dentry *dentry) |
| { |
| struct dentry *parent; |
| struct inode *dir; |
| int error = 0; |
| |
| parent = dget_parent(dentry); |
| dir = d_inode(parent); |
| mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| error = __rpc_rmpipe(dir, dentry); |
| mutex_unlock(&dir->i_mutex); |
| dput(parent); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(rpc_unlink); |
| |
| /** |
| * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head |
| * @pdh: pointer to struct rpc_pipe_dir_head |
| */ |
| void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) |
| { |
| INIT_LIST_HEAD(&pdh->pdh_entries); |
| pdh->pdh_dentry = NULL; |
| } |
| EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); |
| |
| /** |
| * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object |
| * @pdo: pointer to struct rpc_pipe_dir_object |
| * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops |
| * @pdo_data: pointer to caller-defined data |
| */ |
| void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, |
| const struct rpc_pipe_dir_object_ops *pdo_ops, |
| void *pdo_data) |
| { |
| INIT_LIST_HEAD(&pdo->pdo_head); |
| pdo->pdo_ops = pdo_ops; |
| pdo->pdo_data = pdo_data; |
| } |
| EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); |
| |
| static int |
| rpc_add_pipe_dir_object_locked(struct net *net, |
| struct rpc_pipe_dir_head *pdh, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| int ret = 0; |
| |
| if (pdh->pdh_dentry) |
| ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); |
| if (ret == 0) |
| list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); |
| return ret; |
| } |
| |
| static void |
| rpc_remove_pipe_dir_object_locked(struct net *net, |
| struct rpc_pipe_dir_head *pdh, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| if (pdh->pdh_dentry) |
| pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); |
| list_del_init(&pdo->pdo_head); |
| } |
| |
| /** |
| * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory |
| * @net: pointer to struct net |
| * @pdh: pointer to struct rpc_pipe_dir_head |
| * @pdo: pointer to struct rpc_pipe_dir_object |
| * |
| */ |
| int |
| rpc_add_pipe_dir_object(struct net *net, |
| struct rpc_pipe_dir_head *pdh, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| int ret = 0; |
| |
| if (list_empty(&pdo->pdo_head)) { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| mutex_lock(&sn->pipefs_sb_lock); |
| ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); |
| |
| /** |
| * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory |
| * @net: pointer to struct net |
| * @pdh: pointer to struct rpc_pipe_dir_head |
| * @pdo: pointer to struct rpc_pipe_dir_object |
| * |
| */ |
| void |
| rpc_remove_pipe_dir_object(struct net *net, |
| struct rpc_pipe_dir_head *pdh, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| if (!list_empty(&pdo->pdo_head)) { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| mutex_lock(&sn->pipefs_sb_lock); |
| rpc_remove_pipe_dir_object_locked(net, pdh, pdo); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| } |
| } |
| EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); |
| |
| /** |
| * rpc_find_or_alloc_pipe_dir_object |
| * @net: pointer to struct net |
| * @pdh: pointer to struct rpc_pipe_dir_head |
| * @match: match struct rpc_pipe_dir_object to data |
| * @alloc: allocate a new struct rpc_pipe_dir_object |
| * @data: user defined data for match() and alloc() |
| * |
| */ |
| struct rpc_pipe_dir_object * |
| rpc_find_or_alloc_pipe_dir_object(struct net *net, |
| struct rpc_pipe_dir_head *pdh, |
| int (*match)(struct rpc_pipe_dir_object *, void *), |
| struct rpc_pipe_dir_object *(*alloc)(void *), |
| void *data) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| struct rpc_pipe_dir_object *pdo; |
| |
| mutex_lock(&sn->pipefs_sb_lock); |
| list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { |
| if (!match(pdo, data)) |
| continue; |
| goto out; |
| } |
| pdo = alloc(data); |
| if (!pdo) |
| goto out; |
| rpc_add_pipe_dir_object_locked(net, pdh, pdo); |
| out: |
| mutex_unlock(&sn->pipefs_sb_lock); |
| return pdo; |
| } |
| EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); |
| |
| static void |
| rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
| { |
| struct rpc_pipe_dir_object *pdo; |
| struct dentry *dir = pdh->pdh_dentry; |
| |
| list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
| pdo->pdo_ops->create(dir, pdo); |
| } |
| |
| static void |
| rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) |
| { |
| struct rpc_pipe_dir_object *pdo; |
| struct dentry *dir = pdh->pdh_dentry; |
| |
| list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) |
| pdo->pdo_ops->destroy(dir, pdo); |
| } |
| |
| enum { |
| RPCAUTH_info, |
| RPCAUTH_EOF |
| }; |
| |
| static const struct rpc_filelist authfiles[] = { |
| [RPCAUTH_info] = { |
| .name = "info", |
| .i_fop = &rpc_info_operations, |
| .mode = S_IFREG | S_IRUSR, |
| }, |
| }; |
| |
| static int rpc_clntdir_populate(struct dentry *dentry, void *private) |
| { |
| return rpc_populate(dentry, |
| authfiles, RPCAUTH_info, RPCAUTH_EOF, |
| private); |
| } |
| |
| static void rpc_clntdir_depopulate(struct dentry *dentry) |
| { |
| rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); |
| } |
| |
| /** |
| * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs |
| * @dentry: the parent of new directory |
| * @name: the name of new directory |
| * @rpc_client: rpc client to associate with this directory |
| * |
| * This creates a directory at the given @path associated with |
| * @rpc_clnt, which will contain a file named "info" with some basic |
| * information about the client, together with any "pipes" that may |
| * later be created using rpc_mkpipe(). |
| */ |
| struct dentry *rpc_create_client_dir(struct dentry *dentry, |
| const char *name, |
| struct rpc_clnt *rpc_client) |
| { |
| struct dentry *ret; |
| |
| ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, |
| rpc_clntdir_populate, rpc_client); |
| if (!IS_ERR(ret)) { |
| rpc_client->cl_pipedir_objects.pdh_dentry = ret; |
| rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
| } |
| return ret; |
| } |
| |
| /** |
| * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() |
| * @rpc_client: rpc_client for the pipe |
| */ |
| int rpc_remove_client_dir(struct rpc_clnt *rpc_client) |
| { |
| struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; |
| |
| if (dentry == NULL) |
| return 0; |
| rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); |
| rpc_client->cl_pipedir_objects.pdh_dentry = NULL; |
| return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
| } |
| |
| static const struct rpc_filelist cache_pipefs_files[3] = { |
| [0] = { |
| .name = "channel", |
| .i_fop = &cache_file_operations_pipefs, |
| .mode = S_IFREG|S_IRUSR|S_IWUSR, |
| }, |
| [1] = { |
| .name = "content", |
| .i_fop = &content_file_operations_pipefs, |
| .mode = S_IFREG|S_IRUSR, |
| }, |
| [2] = { |
| .name = "flush", |
| .i_fop = &cache_flush_operations_pipefs, |
| .mode = S_IFREG|S_IRUSR|S_IWUSR, |
| }, |
| }; |
| |
| static int rpc_cachedir_populate(struct dentry *dentry, void *private) |
| { |
| return rpc_populate(dentry, |
| cache_pipefs_files, 0, 3, |
| private); |
| } |
| |
| static void rpc_cachedir_depopulate(struct dentry *dentry) |
| { |
| rpc_depopulate(dentry, cache_pipefs_files, 0, 3); |
| } |
| |
| struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, |
| umode_t umode, struct cache_detail *cd) |
| { |
| return rpc_mkdir_populate(parent, name, umode, NULL, |
| rpc_cachedir_populate, cd); |
| } |
| |
| void rpc_remove_cache_dir(struct dentry *dentry) |
| { |
| rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); |
| } |
| |
| /* |
| * populate the filesystem |
| */ |
| static const struct super_operations s_ops = { |
| .alloc_inode = rpc_alloc_inode, |
| .destroy_inode = rpc_destroy_inode, |
| .statfs = simple_statfs, |
| }; |
| |
| #define RPCAUTH_GSSMAGIC 0x67596969 |
| |
| /* |
| * We have a single directory with 1 node in it. |
| */ |
| enum { |
| RPCAUTH_lockd, |
| RPCAUTH_mount, |
| RPCAUTH_nfs, |
| RPCAUTH_portmap, |
| RPCAUTH_statd, |
| RPCAUTH_nfsd4_cb, |
| RPCAUTH_cache, |
| RPCAUTH_nfsd, |
| RPCAUTH_gssd, |
| RPCAUTH_RootEOF |
| }; |
| |
| static const struct rpc_filelist files[] = { |
| [RPCAUTH_lockd] = { |
| .name = "lockd", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_mount] = { |
| .name = "mount", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_nfs] = { |
| .name = "nfs", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_portmap] = { |
| .name = "portmap", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_statd] = { |
| .name = "statd", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_nfsd4_cb] = { |
| .name = "nfsd4_cb", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_cache] = { |
| .name = "cache", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_nfsd] = { |
| .name = "nfsd", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| [RPCAUTH_gssd] = { |
| .name = "gssd", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| }; |
| |
| /* |
| * This call can be used only in RPC pipefs mount notification hooks. |
| */ |
| struct dentry *rpc_d_lookup_sb(const struct super_block *sb, |
| const unsigned char *dir_name) |
| { |
| struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); |
| return d_hash_and_lookup(sb->s_root, &dir); |
| } |
| EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); |
| |
| int rpc_pipefs_init_net(struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); |
| if (IS_ERR(sn->gssd_dummy)) |
| return PTR_ERR(sn->gssd_dummy); |
| |
| mutex_init(&sn->pipefs_sb_lock); |
| sn->pipe_version = -1; |
| return 0; |
| } |
| |
| void rpc_pipefs_exit_net(struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| rpc_destroy_pipe_data(sn->gssd_dummy); |
| } |
| |
| /* |
| * This call will be used for per network namespace operations calls. |
| * Note: Function will be returned with pipefs_sb_lock taken if superblock was |
| * found. This lock have to be released by rpc_put_sb_net() when all operations |
| * will be completed. |
| */ |
| struct super_block *rpc_get_sb_net(const struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| mutex_lock(&sn->pipefs_sb_lock); |
| if (sn->pipefs_sb) |
| return sn->pipefs_sb; |
| mutex_unlock(&sn->pipefs_sb_lock); |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(rpc_get_sb_net); |
| |
| void rpc_put_sb_net(const struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| WARN_ON(sn->pipefs_sb == NULL); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| } |
| EXPORT_SYMBOL_GPL(rpc_put_sb_net); |
| |
| static const struct rpc_filelist gssd_dummy_clnt_dir[] = { |
| [0] = { |
| .name = "clntXX", |
| .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| }, |
| }; |
| |
| static ssize_t |
| dummy_downcall(struct file *filp, const char __user *src, size_t len) |
| { |
| return -EINVAL; |
| } |
| |
| static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { |
| .upcall = rpc_pipe_generic_upcall, |
| .downcall = dummy_downcall, |
| }; |
| |
| /* |
| * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect |
| * that it will ever use this info to handle an upcall, but rpc.gssd expects |
| * that this file will be there and have a certain format. |
| */ |
| static int |
| rpc_show_dummy_info(struct seq_file *m, void *v) |
| { |
| seq_printf(m, "RPC server: %s\n", utsname()->nodename); |
| seq_printf(m, "service: foo (1) version 0\n"); |
| seq_printf(m, "address: 127.0.0.1\n"); |
| seq_printf(m, "protocol: tcp\n"); |
| seq_printf(m, "port: 0\n"); |
| return 0; |
| } |
| |
| static int |
| rpc_dummy_info_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, rpc_show_dummy_info, NULL); |
| } |
| |
| static const struct file_operations rpc_dummy_info_operations = { |
| .owner = THIS_MODULE, |
| .open = rpc_dummy_info_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static const struct rpc_filelist gssd_dummy_info_file[] = { |
| [0] = { |
| .name = "info", |
| .i_fop = &rpc_dummy_info_operations, |
| .mode = S_IFREG | S_IRUSR, |
| }, |
| }; |
| |
| /** |
| * rpc_gssd_dummy_populate - create a dummy gssd pipe |
| * @root: root of the rpc_pipefs filesystem |
| * @pipe_data: pipe data created when netns is initialized |
| * |
| * Create a dummy set of directories and a pipe that gssd can hold open to |
| * indicate that it is up and running. |
| */ |
| static struct dentry * |
| rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) |
| { |
| int ret = 0; |
| struct dentry *gssd_dentry; |
| struct dentry *clnt_dentry = NULL; |
| struct dentry *pipe_dentry = NULL; |
| struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, |
| strlen(files[RPCAUTH_gssd].name)); |
| |
| /* We should never get this far if "gssd" doesn't exist */ |
| gssd_dentry = d_hash_and_lookup(root, &q); |
| if (!gssd_dentry) |
| return ERR_PTR(-ENOENT); |
| |
| ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); |
| if (ret) { |
| pipe_dentry = ERR_PTR(ret); |
| goto out; |
| } |
| |
| q.name = gssd_dummy_clnt_dir[0].name; |
| q.len = strlen(gssd_dummy_clnt_dir[0].name); |
| clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); |
| if (!clnt_dentry) { |
| pipe_dentry = ERR_PTR(-ENOENT); |
| goto out; |
| } |
| |
| ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL); |
| if (ret) { |
| __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
| pipe_dentry = ERR_PTR(ret); |
| goto out; |
| } |
| |
| pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); |
| if (IS_ERR(pipe_dentry)) { |
| __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1); |
| __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
| } |
| out: |
| dput(clnt_dentry); |
| dput(gssd_dentry); |
| return pipe_dentry; |
| } |
| |
| static void |
| rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry) |
| { |
| struct dentry *clnt_dir = pipe_dentry->d_parent; |
| struct dentry *gssd_dir = clnt_dir->d_parent; |
| |
| dget(pipe_dentry); |
| __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry); |
| __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1); |
| __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1); |
| dput(pipe_dentry); |
| } |
| |
| static int |
| rpc_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct inode *inode; |
| struct dentry *root, *gssd_dentry; |
| struct net *net = data; |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| int err; |
| |
| sb->s_blocksize = PAGE_CACHE_SIZE; |
| sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| sb->s_magic = RPCAUTH_GSSMAGIC; |
| sb->s_op = &s_ops; |
| sb->s_d_op = &simple_dentry_operations; |
| sb->s_time_gran = 1; |
| |
| inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); |
| sb->s_root = root = d_make_root(inode); |
| if (!root) |
| return -ENOMEM; |
| if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
| return -ENOMEM; |
| |
| gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); |
| if (IS_ERR(gssd_dentry)) { |
| __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
| return PTR_ERR(gssd_dentry); |
| } |
| |
| dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", |
| net, NET_NAME(net)); |
| mutex_lock(&sn->pipefs_sb_lock); |
| sn->pipefs_sb = sb; |
| err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| RPC_PIPEFS_MOUNT, |
| sb); |
| if (err) |
| goto err_depopulate; |
| sb->s_fs_info = get_net(net); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| return 0; |
| |
| err_depopulate: |
| rpc_gssd_dummy_depopulate(gssd_dentry); |
| blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| RPC_PIPEFS_UMOUNT, |
| sb); |
| sn->pipefs_sb = NULL; |
| __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| return err; |
| } |
| |
| bool |
| gssd_running(struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| struct rpc_pipe *pipe = sn->gssd_dummy; |
| |
| return pipe->nreaders || pipe->nwriters; |
| } |
| EXPORT_SYMBOL_GPL(gssd_running); |
| |
| static struct dentry * |
| rpc_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data) |
| { |
| return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
| } |
| |
| static void rpc_kill_sb(struct super_block *sb) |
| { |
| struct net *net = sb->s_fs_info; |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| mutex_lock(&sn->pipefs_sb_lock); |
| if (sn->pipefs_sb != sb) { |
| mutex_unlock(&sn->pipefs_sb_lock); |
| goto out; |
| } |
| sn->pipefs_sb = NULL; |
| dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", |
| net, NET_NAME(net)); |
| blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
| RPC_PIPEFS_UMOUNT, |
| sb); |
| mutex_unlock(&sn->pipefs_sb_lock); |
| put_net(net); |
| out: |
| kill_litter_super(sb); |
| } |
| |
| static struct file_system_type rpc_pipe_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "rpc_pipefs", |
| .mount = rpc_mount, |
| .kill_sb = rpc_kill_sb, |
| }; |
| MODULE_ALIAS_FS("rpc_pipefs"); |
| MODULE_ALIAS("rpc_pipefs"); |
| |
| static void |
| init_once(void *foo) |
| { |
| struct rpc_inode *rpci = (struct rpc_inode *) foo; |
| |
| inode_init_once(&rpci->vfs_inode); |
| rpci->private = NULL; |
| rpci->pipe = NULL; |
| init_waitqueue_head(&rpci->waitq); |
| } |
| |
| int register_rpc_pipefs(void) |
| { |
| int err; |
| |
| rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
| sizeof(struct rpc_inode), |
| 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (!rpc_inode_cachep) |
| return -ENOMEM; |
| err = rpc_clients_notifier_register(); |
| if (err) |
| goto err_notifier; |
| err = register_filesystem(&rpc_pipe_fs_type); |
| if (err) |
| goto err_register; |
| return 0; |
| |
| err_register: |
| rpc_clients_notifier_unregister(); |
| err_notifier: |
| kmem_cache_destroy(rpc_inode_cachep); |
| return err; |
| } |
| |
| void unregister_rpc_pipefs(void) |
| { |
| rpc_clients_notifier_unregister(); |
| kmem_cache_destroy(rpc_inode_cachep); |
| unregister_filesystem(&rpc_pipe_fs_type); |
| } |