![Linus Torvalds](/assets/img/avatar_default.png)
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (52 commits) init: Open /dev/console from rootfs mqueue: fix typo "failues" -> "failures" mqueue: only set error codes if they are really necessary mqueue: simplify do_open() error handling mqueue: apply mathematics distributivity on mq_bytes calculation mqueue: remove unneeded info->messages initialization mqueue: fix mq_open() file descriptor leak on user-space processes fix race in d_splice_alias() set S_DEAD on unlink() and non-directory rename() victims vfs: add NOFOLLOW flag to umount(2) get rid of ->mnt_parent in tomoyo/realpath hppfs can use existing proc_mnt, no need for do_kern_mount() in there Mirror MS_KERNMOUNT in ->mnt_flags get rid of useless vfsmount_lock use in put_mnt_ns() Take vfsmount_lock to fs/internal.h get rid of insanity with namespace roots in tomoyo take check for new events in namespace (guts of mounts_poll()) to namespace.c Don't mess with generic_permission() under ->d_lock in hpfs sanitize const/signedness for udf nilfs: sanitize const/signedness in dealing with ->d_name.name ... Fix up fairly trivial (famous last words...) conflicts in drivers/infiniband/core/uverbs_main.c and security/tomoyo/realpath.c
1070 lines
24 KiB
C
1070 lines
24 KiB
C
/*
|
|
* 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 <asm/ioctls.h>
|
|
#include <linux/fs.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>
|
|
|
|
static struct vfsmount *rpc_mount __read_mostly;
|
|
static int rpc_mount_count;
|
|
|
|
static struct file_system_type rpc_pipe_fs_type;
|
|
|
|
|
|
static struct kmem_cache *rpc_inode_cachep __read_mostly;
|
|
|
|
#define RPC_UPCALL_TIMEOUT (30*HZ)
|
|
|
|
static void rpc_purge_list(struct rpc_inode *rpci, 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(&msg->list);
|
|
msg->errno = err;
|
|
destroy_msg(msg);
|
|
} while (!list_empty(head));
|
|
wake_up(&rpci->waitq);
|
|
}
|
|
|
|
static void
|
|
rpc_timeout_upcall_queue(struct work_struct *work)
|
|
{
|
|
LIST_HEAD(free_list);
|
|
struct rpc_inode *rpci =
|
|
container_of(work, struct rpc_inode, queue_timeout.work);
|
|
struct inode *inode = &rpci->vfs_inode;
|
|
void (*destroy_msg)(struct rpc_pipe_msg *);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (rpci->ops == NULL) {
|
|
spin_unlock(&inode->i_lock);
|
|
return;
|
|
}
|
|
destroy_msg = rpci->ops->destroy_msg;
|
|
if (rpci->nreaders == 0) {
|
|
list_splice_init(&rpci->pipe, &free_list);
|
|
rpci->pipelen = 0;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
|
|
}
|
|
|
|
/**
|
|
* rpc_queue_upcall - queue an upcall message to userspace
|
|
* @inode: inode of 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 inode *inode, struct rpc_pipe_msg *msg)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
int res = -EPIPE;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (rpci->ops == NULL)
|
|
goto out;
|
|
if (rpci->nreaders) {
|
|
list_add_tail(&msg->list, &rpci->pipe);
|
|
rpci->pipelen += msg->len;
|
|
res = 0;
|
|
} else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
|
|
if (list_empty(&rpci->pipe))
|
|
queue_delayed_work(rpciod_workqueue,
|
|
&rpci->queue_timeout,
|
|
RPC_UPCALL_TIMEOUT);
|
|
list_add_tail(&msg->list, &rpci->pipe);
|
|
rpci->pipelen += msg->len;
|
|
res = 0;
|
|
}
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
wake_up(&rpci->waitq);
|
|
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_inode *rpci = RPC_I(inode);
|
|
const struct rpc_pipe_ops *ops;
|
|
int need_release;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
ops = rpci->ops;
|
|
if (ops != NULL) {
|
|
LIST_HEAD(free_list);
|
|
spin_lock(&inode->i_lock);
|
|
need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
|
|
rpci->nreaders = 0;
|
|
list_splice_init(&rpci->in_upcall, &free_list);
|
|
list_splice_init(&rpci->pipe, &free_list);
|
|
rpci->pipelen = 0;
|
|
rpci->ops = NULL;
|
|
spin_unlock(&inode->i_lock);
|
|
rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
|
|
rpci->nwriters = 0;
|
|
if (need_release && ops->release_pipe)
|
|
ops->release_pipe(inode);
|
|
cancel_delayed_work_sync(&rpci->queue_timeout);
|
|
}
|
|
rpc_inode_setowner(inode, NULL);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
|
|
static struct inode *
|
|
rpc_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct rpc_inode *rpci;
|
|
rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
|
|
if (!rpci)
|
|
return NULL;
|
|
return &rpci->vfs_inode;
|
|
}
|
|
|
|
static void
|
|
rpc_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
|
|
}
|
|
|
|
static int
|
|
rpc_pipe_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
int first_open;
|
|
int res = -ENXIO;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (rpci->ops == NULL)
|
|
goto out;
|
|
first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
|
|
if (first_open && rpci->ops->open_pipe) {
|
|
res = rpci->ops->open_pipe(inode);
|
|
if (res)
|
|
goto out;
|
|
}
|
|
if (filp->f_mode & FMODE_READ)
|
|
rpci->nreaders++;
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
rpci->nwriters++;
|
|
res = 0;
|
|
out:
|
|
mutex_unlock(&inode->i_mutex);
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
rpc_pipe_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
struct rpc_pipe_msg *msg;
|
|
int last_close;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (rpci->ops == NULL)
|
|
goto out;
|
|
msg = (struct rpc_pipe_msg *)filp->private_data;
|
|
if (msg != NULL) {
|
|
spin_lock(&inode->i_lock);
|
|
msg->errno = -EAGAIN;
|
|
list_del(&msg->list);
|
|
spin_unlock(&inode->i_lock);
|
|
rpci->ops->destroy_msg(msg);
|
|
}
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
rpci->nwriters --;
|
|
if (filp->f_mode & FMODE_READ) {
|
|
rpci->nreaders --;
|
|
if (rpci->nreaders == 0) {
|
|
LIST_HEAD(free_list);
|
|
spin_lock(&inode->i_lock);
|
|
list_splice_init(&rpci->pipe, &free_list);
|
|
rpci->pipelen = 0;
|
|
spin_unlock(&inode->i_lock);
|
|
rpc_purge_list(rpci, &free_list,
|
|
rpci->ops->destroy_msg, -EAGAIN);
|
|
}
|
|
}
|
|
last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
|
|
if (last_close && rpci->ops->release_pipe)
|
|
rpci->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 = filp->f_path.dentry->d_inode;
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
struct rpc_pipe_msg *msg;
|
|
int res = 0;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (rpci->ops == NULL) {
|
|
res = -EPIPE;
|
|
goto out_unlock;
|
|
}
|
|
msg = filp->private_data;
|
|
if (msg == NULL) {
|
|
spin_lock(&inode->i_lock);
|
|
if (!list_empty(&rpci->pipe)) {
|
|
msg = list_entry(rpci->pipe.next,
|
|
struct rpc_pipe_msg,
|
|
list);
|
|
list_move(&msg->list, &rpci->in_upcall);
|
|
rpci->pipelen -= msg->len;
|
|
filp->private_data = msg;
|
|
msg->copied = 0;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
if (msg == NULL)
|
|
goto out_unlock;
|
|
}
|
|
/* NOTE: it is up to the callback to update msg->copied */
|
|
res = rpci->ops->upcall(filp, msg, buf, len);
|
|
if (res < 0 || msg->len == msg->copied) {
|
|
filp->private_data = NULL;
|
|
spin_lock(&inode->i_lock);
|
|
list_del(&msg->list);
|
|
spin_unlock(&inode->i_lock);
|
|
rpci->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 = filp->f_path.dentry->d_inode;
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
int res;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
res = -EPIPE;
|
|
if (rpci->ops != NULL)
|
|
res = rpci->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 rpc_inode *rpci;
|
|
unsigned int mask = 0;
|
|
|
|
rpci = RPC_I(filp->f_path.dentry->d_inode);
|
|
poll_wait(filp, &rpci->waitq, wait);
|
|
|
|
mask = POLLOUT | POLLWRNORM;
|
|
if (rpci->ops == NULL)
|
|
mask |= POLLERR | POLLHUP;
|
|
if (filp->private_data || !list_empty(&rpci->pipe))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
return mask;
|
|
}
|
|
|
|
static int
|
|
rpc_pipe_ioctl(struct inode *ino, struct file *filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
|
|
int len;
|
|
|
|
switch (cmd) {
|
|
case FIONREAD:
|
|
if (rpci->ops == NULL)
|
|
return -EPIPE;
|
|
len = rpci->pipelen;
|
|
if (filp->private_data) {
|
|
struct rpc_pipe_msg *msg;
|
|
msg = (struct rpc_pipe_msg *)filp->private_data;
|
|
len += msg->len - msg->copied;
|
|
}
|
|
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,
|
|
.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;
|
|
|
|
seq_printf(m, "RPC server: %s\n", clnt->cl_server);
|
|
seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
|
|
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));
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rpc_info_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
int ret = single_open(file, rpc_show_info, NULL);
|
|
|
|
if (!ret) {
|
|
struct seq_file *m = file->private_data;
|
|
mutex_lock(&inode->i_mutex);
|
|
clnt = RPC_I(inode)->private;
|
|
if (clnt) {
|
|
kref_get(&clnt->cl_kref);
|
|
m->private = clnt;
|
|
} else {
|
|
single_release(inode, file);
|
|
ret = -EINVAL;
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
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;
|
|
};
|
|
|
|
struct vfsmount *rpc_get_mount(void)
|
|
{
|
|
int err;
|
|
|
|
err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count);
|
|
if (err != 0)
|
|
return ERR_PTR(err);
|
|
return rpc_mount;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_get_mount);
|
|
|
|
void rpc_put_mount(void)
|
|
{
|
|
simple_release_fs(&rpc_mount, &rpc_mount_count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_put_mount);
|
|
|
|
static int rpc_delete_dentry(struct dentry *dentry)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static const struct dentry_operations rpc_dentry_operations = {
|
|
.d_delete = rpc_delete_dentry,
|
|
};
|
|
|
|
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_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;
|
|
|
|
BUG_ON(!d_unhashed(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 %s\n",
|
|
__FILE__, __func__, dentry->d_name.name);
|
|
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 int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode,
|
|
const struct file_operations *i_fop,
|
|
void *private,
|
|
const struct rpc_pipe_ops *ops,
|
|
int flags)
|
|
{
|
|
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(dentry->d_inode);
|
|
rpci->nkern_readwriters = 1;
|
|
rpci->private = private;
|
|
rpci->flags = flags;
|
|
rpci->ops = ops;
|
|
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;
|
|
}
|
|
|
|
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 = dentry->d_inode;
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
|
|
rpci->nkern_readwriters--;
|
|
if (rpci->nkern_readwriters != 0)
|
|
return 0;
|
|
rpc_close_pipes(inode);
|
|
return __rpc_unlink(dir, dentry);
|
|
}
|
|
|
|
static struct dentry *__rpc_lookup_create(struct dentry *parent,
|
|
struct qstr *name)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
dentry = d_lookup(parent, name);
|
|
if (!dentry) {
|
|
dentry = d_alloc(parent, name);
|
|
if (!dentry) {
|
|
dentry = ERR_PTR(-ENOMEM);
|
|
goto out_err;
|
|
}
|
|
}
|
|
if (!dentry->d_inode)
|
|
dentry->d_op = &rpc_dentry_operations;
|
|
out_err:
|
|
return dentry;
|
|
}
|
|
|
|
static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
|
|
struct qstr *name)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
dentry = __rpc_lookup_create(parent, name);
|
|
if (dentry->d_inode == NULL)
|
|
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 = parent->d_inode;
|
|
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);
|
|
name.hash = full_name_hash(name.name, name.len);
|
|
dentry = d_lookup(parent, &name);
|
|
|
|
if (dentry == NULL)
|
|
continue;
|
|
if (dentry->d_inode == NULL)
|
|
goto next;
|
|
switch (dentry->d_inode->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 = parent->d_inode;
|
|
|
|
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 = parent->d_inode;
|
|
struct dentry *dentry;
|
|
int i, err;
|
|
|
|
mutex_lock(&dir->i_mutex);
|
|
for (i = start; i < eof; i++) {
|
|
struct qstr q;
|
|
|
|
q.name = files[i].name;
|
|
q.len = strlen(files[i].name);
|
|
q.hash = full_name_hash(q.name, q.len);
|
|
dentry = __rpc_lookup_create_exclusive(parent, &q);
|
|
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 %s\n",
|
|
__FILE__, __func__, parent->d_name.name);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *rpc_mkdir_populate(struct dentry *parent,
|
|
struct qstr *name, umode_t mode, void *private,
|
|
int (*populate)(struct dentry *, void *), void *args_populate)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir = parent->d_inode;
|
|
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 = parent->d_inode;
|
|
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
|
|
* @ops: operations defining the behavior of the pipe: upcall, downcall,
|
|
* release_pipe, open_pipe, and destroy_msg.
|
|
* @flags: rpc_inode flags
|
|
*
|
|
* 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->f_dentry->d_inode)->private.
|
|
*/
|
|
struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
|
|
void *private, const struct rpc_pipe_ops *ops,
|
|
int flags)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir = parent->d_inode;
|
|
umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
|
|
struct qstr q;
|
|
int err;
|
|
|
|
if (ops->upcall == NULL)
|
|
umode &= ~S_IRUGO;
|
|
if (ops->downcall == NULL)
|
|
umode &= ~S_IWUGO;
|
|
|
|
q.name = name;
|
|
q.len = strlen(name);
|
|
q.hash = full_name_hash(q.name, q.len),
|
|
|
|
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
|
|
dentry = __rpc_lookup_create(parent, &q);
|
|
if (IS_ERR(dentry))
|
|
goto out;
|
|
if (dentry->d_inode) {
|
|
struct rpc_inode *rpci = RPC_I(dentry->d_inode);
|
|
if (rpci->private != private ||
|
|
rpci->ops != ops ||
|
|
rpci->flags != flags) {
|
|
dput (dentry);
|
|
err = -EBUSY;
|
|
goto out_err;
|
|
}
|
|
rpci->nkern_readwriters++;
|
|
goto out;
|
|
}
|
|
|
|
err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
|
|
private, ops, flags);
|
|
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 %s/%s (errno = %d)\n",
|
|
__FILE__, __func__, parent->d_name.name, name,
|
|
err);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpc_mkpipe);
|
|
|
|
/**
|
|
* 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 = parent->d_inode;
|
|
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);
|
|
|
|
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: dentry from the rpc_pipefs root to the new directory
|
|
* @name: &struct qstr for the name
|
|
* @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,
|
|
struct qstr *name,
|
|
struct rpc_clnt *rpc_client)
|
|
{
|
|
return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
|
|
rpc_clntdir_populate, rpc_client);
|
|
}
|
|
|
|
/**
|
|
* rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
|
|
* @dentry: directory to remove
|
|
*/
|
|
int rpc_remove_client_dir(struct dentry *dentry)
|
|
{
|
|
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, struct qstr *name,
|
|
mode_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_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,
|
|
},
|
|
};
|
|
|
|
static int
|
|
rpc_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *inode;
|
|
struct dentry *root;
|
|
|
|
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_time_gran = 1;
|
|
|
|
inode = rpc_get_inode(sb, S_IFDIR | 0755);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
sb->s_root = root = d_alloc_root(inode);
|
|
if (!root) {
|
|
iput(inode);
|
|
return -ENOMEM;
|
|
}
|
|
if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rpc_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type rpc_pipe_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "rpc_pipefs",
|
|
.get_sb = rpc_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static void
|
|
init_once(void *foo)
|
|
{
|
|
struct rpc_inode *rpci = (struct rpc_inode *) foo;
|
|
|
|
inode_init_once(&rpci->vfs_inode);
|
|
rpci->private = NULL;
|
|
rpci->nreaders = 0;
|
|
rpci->nwriters = 0;
|
|
INIT_LIST_HEAD(&rpci->in_upcall);
|
|
INIT_LIST_HEAD(&rpci->in_downcall);
|
|
INIT_LIST_HEAD(&rpci->pipe);
|
|
rpci->pipelen = 0;
|
|
init_waitqueue_head(&rpci->waitq);
|
|
INIT_DELAYED_WORK(&rpci->queue_timeout,
|
|
rpc_timeout_upcall_queue);
|
|
rpci->ops = NULL;
|
|
}
|
|
|
|
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 = register_filesystem(&rpc_pipe_fs_type);
|
|
if (err) {
|
|
kmem_cache_destroy(rpc_inode_cachep);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void unregister_rpc_pipefs(void)
|
|
{
|
|
kmem_cache_destroy(rpc_inode_cachep);
|
|
unregister_filesystem(&rpc_pipe_fs_type);
|
|
}
|