* Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
*
*/
-#include <linux/config.h>
#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/dnotify.h>
+#include <linux/fsnotify.h>
#include <linux/kernel.h>
#include <asm/ioctls.h>
static struct file_system_type rpc_pipe_fs_type;
-static kmem_cache_t *rpc_inode_cachep __read_mostly;
+static struct kmem_cache *rpc_inode_cachep __read_mostly;
#define RPC_UPCALL_TIMEOUT (30*HZ)
-static void
-__rpc_purge_upcall(struct inode *inode, int err)
+static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
+ void (*destroy_msg)(struct rpc_pipe_msg *), int err)
{
- struct rpc_inode *rpci = RPC_I(inode);
struct rpc_pipe_msg *msg;
- while (!list_empty(&rpci->pipe)) {
- msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list);
- list_del_init(&msg->list);
- msg->errno = err;
- rpci->ops->destroy_msg(msg);
- }
- while (!list_empty(&rpci->in_upcall)) {
- msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list);
- list_del_init(&msg->list);
+ if (list_empty(head))
+ return;
+ do {
+ msg = list_entry(head->next, struct rpc_pipe_msg, list);
+ list_del(&msg->list);
msg->errno = err;
- rpci->ops->destroy_msg(msg);
- }
- rpci->pipelen = 0;
+ destroy_msg(msg);
+ } while (!list_empty(head));
wake_up(&rpci->waitq);
}
static void
-rpc_timeout_upcall_queue(void *data)
+rpc_timeout_upcall_queue(struct work_struct *work)
{
- struct rpc_inode *rpci = (struct rpc_inode *)data;
+ 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 *);
- down(&inode->i_sem);
- if (rpci->nreaders == 0 && !list_empty(&rpci->pipe))
- __rpc_purge_upcall(inode, -ETIMEDOUT);
- up(&inode->i_sem);
+ 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
+ * @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 = 0;
+ int res = -EPIPE;
- down(&inode->i_sem);
+ 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))
- schedule_delayed_work(&rpci->queue_timeout,
+ queue_delayed_work(rpciod_workqueue,
+ &rpci->queue_timeout,
RPC_UPCALL_TIMEOUT);
list_add_tail(&msg->list, &rpci->pipe);
rpci->pipelen += msg->len;
- } else
- res = -EPIPE;
- up(&inode->i_sem);
+ 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);
-
- cancel_delayed_work(&rpci->queue_timeout);
- flush_scheduled_work();
- down(&inode->i_sem);
- if (rpci->ops != NULL) {
+ 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;
- __rpc_purge_upcall(inode, -EPIPE);
- rpci->nwriters = 0;
- if (rpci->ops->release_pipe)
- rpci->ops->release_pipe(inode);
+ 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);
}
- up(&inode->i_sem);
-}
-
-static inline void
-rpc_inode_setowner(struct inode *inode, void *private)
-{
- RPC_I(inode)->private = private;
+ 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, SLAB_KERNEL);
+ rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
if (!rpci)
return NULL;
return &rpci->vfs_inode;
rpc_pipe_open(struct inode *inode, struct file *filp)
{
struct rpc_inode *rpci = RPC_I(inode);
+ int first_open;
int res = -ENXIO;
- down(&inode->i_sem);
- if (rpci->ops != NULL) {
- if (filp->f_mode & FMODE_READ)
- rpci->nreaders ++;
- if (filp->f_mode & FMODE_WRITE)
- rpci->nwriters ++;
- res = 0;
+ 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;
}
- up(&inode->i_sem);
+ 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(filp->f_dentry->d_inode);
+ struct rpc_inode *rpci = RPC_I(inode);
struct rpc_pipe_msg *msg;
+ int last_close;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
if (rpci->ops == NULL)
goto out;
msg = (struct rpc_pipe_msg *)filp->private_data;
if (msg != NULL) {
- msg->errno = -EPIPE;
- list_del_init(&msg->list);
+ 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)
+ if (filp->f_mode & FMODE_READ) {
rpci->nreaders --;
- if (!rpci->nreaders)
- __rpc_purge_upcall(inode, -EPIPE);
- if (rpci->ops->release_pipe)
+ 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:
- up(&inode->i_sem);
+ 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_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct rpc_inode *rpci = RPC_I(inode);
struct rpc_pipe_msg *msg;
int res = 0;
- down(&inode->i_sem);
+ 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,
filp->private_data = msg;
msg->copied = 0;
}
+ spin_unlock(&inode->i_lock);
if (msg == NULL)
goto out_unlock;
}
res = rpci->ops->upcall(filp, msg, buf, len);
if (res < 0 || msg->len == msg->copied) {
filp->private_data = NULL;
- list_del_init(&msg->list);
+ spin_lock(&inode->i_lock);
+ list_del(&msg->list);
+ spin_unlock(&inode->i_lock);
rpci->ops->destroy_msg(msg);
}
out_unlock:
- up(&inode->i_sem);
+ 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_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct rpc_inode *rpci = RPC_I(inode);
int res;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
res = -EPIPE;
if (rpci->ops != NULL)
res = rpci->ops->downcall(filp, buf, len);
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
return res;
}
struct rpc_inode *rpci;
unsigned int mask = 0;
- rpci = RPC_I(filp->f_dentry->d_inode);
+ 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 (!list_empty(&rpci->pipe))
+ if (filp->private_data || !list_empty(&rpci->pipe))
mask |= POLLIN | POLLRDNORM;
return mask;
}
rpc_pipe_ioctl(struct inode *ino, struct file *filp,
unsigned int cmd, unsigned long arg)
{
- struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
+ struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
int len;
switch (cmd) {
}
}
-static struct file_operations rpc_pipe_fops = {
+static const struct file_operations rpc_pipe_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = rpc_pipe_read,
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: %u.%u.%u.%u\n",
- NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr));
- seq_printf(m, "protocol: %s\n",
- clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
+ 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;
}
if (!ret) {
struct seq_file *m = file->private_data;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
clnt = RPC_I(inode)->private;
if (clnt) {
- atomic_inc(&clnt->cl_users);
+ kref_get(&clnt->cl_kref);
m->private = clnt;
} else {
single_release(inode, file);
ret = -EINVAL;
}
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
}
return ret;
}
return single_release(inode, file);
}
-static struct file_operations rpc_info_operations = {
+static const struct file_operations rpc_info_operations = {
.owner = THIS_MODULE,
.open = rpc_info_open,
.read = seq_read,
RPCAUTH_nfs,
RPCAUTH_portmap,
RPCAUTH_statd,
+ RPCAUTH_nfsd4_cb,
RPCAUTH_RootEOF
};
*/
struct rpc_filelist {
char *name;
- struct file_operations *i_fop;
+ const struct file_operations *i_fop;
int mode;
};
.name = "statd",
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
},
+ [RPCAUTH_nfsd4_cb] = {
+ .name = "nfsd4_cb",
+ .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+ },
};
enum {
},
};
+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;
+}
+
+void rpc_put_mount(void)
+{
+ simple_release_fs(&rpc_mount, &rpc_mount_count);
+}
+
+static int rpc_delete_dentry(struct dentry *dentry)
+{
+ return 1;
+}
+
+static const struct dentry_operations rpc_dentry_operations = {
+ .d_delete = rpc_delete_dentry,
+};
+
static int
-rpc_get_mount(void)
+rpc_lookup_parent(char *path, struct nameidata *nd)
{
- return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count);
+ struct vfsmount *mnt;
+
+ if (path[0] == '\0')
+ return -ENOENT;
+
+ mnt = rpc_get_mount();
+ if (IS_ERR(mnt)) {
+ printk(KERN_WARNING "%s: %s failed to mount "
+ "pseudofilesystem \n", __FILE__, __func__);
+ return PTR_ERR(mnt);
+ }
+
+ if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) {
+ printk(KERN_WARNING "%s: %s failed to find path %s\n",
+ __FILE__, __func__, path);
+ rpc_put_mount();
+ return -ENOENT;
+ }
+ return 0;
}
static void
-rpc_put_mount(void)
+rpc_release_path(struct nameidata *nd)
{
- simple_release_fs(&rpc_mount, &rpc_mount_count);
+ path_put(&nd->path);
+ rpc_put_mount();
}
static struct inode *
if (!inode)
return NULL;
inode->i_mode = mode;
- inode->i_uid = inode->i_gid = 0;
- inode->i_blksize = PAGE_CACHE_SIZE;
- inode->i_blocks = 0;
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;
- inode->i_nlink++;
+ inc_nlink(inode);
default:
break;
}
/*
* FIXME: This probably has races.
*/
-static void
-rpc_depopulate(struct dentry *parent)
+static void rpc_depopulate(struct dentry *parent,
+ unsigned long start, unsigned long eof)
{
struct inode *dir = parent->d_inode;
struct list_head *pos, *next;
struct dentry *dentry, *dvec[10];
int n = 0;
- down(&dir->i_sem);
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
repeat:
spin_lock(&dcache_lock);
list_for_each_safe(pos, next, &parent->d_subdirs) {
- dentry = list_entry(pos, struct dentry, d_child);
+ dentry = list_entry(pos, struct dentry, d_u.d_child);
+ if (!dentry->d_inode ||
+ dentry->d_inode->i_ino < start ||
+ dentry->d_inode->i_ino >= eof)
+ continue;
spin_lock(&dentry->d_lock);
if (!d_unhashed(dentry)) {
dget_locked(dentry);
if (n) {
do {
dentry = dvec[--n];
- if (dentry->d_inode) {
- rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
+ if (S_ISREG(dentry->d_inode->i_mode))
simple_unlink(dir, dentry);
- }
+ else if (S_ISDIR(dentry->d_inode->i_mode))
+ simple_rmdir(dir, dentry);
+ d_delete(dentry);
dput(dentry);
} while (n);
goto repeat;
}
- up(&dir->i_sem);
+ mutex_unlock(&dir->i_mutex);
}
static int
struct dentry *dentry;
int mode, i;
- down(&dir->i_sem);
+ mutex_lock(&dir->i_mutex);
for (i = start; i < eof; i++) {
dentry = d_alloc_name(parent, files[i].name);
if (!dentry)
goto out_bad;
+ dentry->d_op = &rpc_dentry_operations;
mode = files[i].mode;
inode = rpc_get_inode(dir->i_sb, mode);
if (!inode) {
if (private)
rpc_inode_setowner(inode, private);
if (S_ISDIR(mode))
- dir->i_nlink++;
+ inc_nlink(dir);
d_add(dentry, inode);
+ fsnotify_create(dir, dentry);
}
- up(&dir->i_sem);
+ mutex_unlock(&dir->i_mutex);
return 0;
out_bad:
- up(&dir->i_sem);
+ mutex_unlock(&dir->i_mutex);
printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
- __FILE__, __FUNCTION__, parent->d_name.name);
+ __FILE__, __func__, parent->d_name.name);
return -ENOMEM;
}
-struct dentry *
-rpc_mkdir(struct dentry *parent, char *name, struct rpc_clnt *rpc_client)
+static int
+__rpc_mkdir(struct inode *dir, struct dentry *dentry)
{
- struct inode *dir;
- struct dentry *dentry;
struct inode *inode;
- int error;
- if (!parent)
- parent = rpc_mount->mnt_root;
+ inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
+ if (!inode)
+ goto out_err;
+ inode->i_ino = iunique(dir->i_sb, 100);
+ d_instantiate(dentry, inode);
+ inc_nlink(dir);
+ fsnotify_mkdir(dir, dentry);
+ return 0;
+out_err:
+ printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
+ __FILE__, __func__, dentry->d_name.name);
+ return -ENOMEM;
+}
- dir = parent->d_inode;
-
- error = rpc_get_mount();
- if (error)
- return ERR_PTR(error);
+static int
+__rpc_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int error;
+ error = simple_rmdir(dir, dentry);
+ if (!error)
+ d_delete(dentry);
+ return error;
+}
- down(&dir->i_sem);
- dentry = lookup_one_len(name, parent, strlen(name));
+static struct dentry *
+rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
+{
+ struct inode *dir = parent->d_inode;
+ struct dentry *dentry;
+
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+ dentry = lookup_one_len(name, parent, len);
if (IS_ERR(dentry))
- goto out_unlock;
- if (dentry->d_inode) {
+ goto out_err;
+ if (!dentry->d_inode)
+ dentry->d_op = &rpc_dentry_operations;
+ else if (exclusive) {
+ dput(dentry);
dentry = ERR_PTR(-EEXIST);
- goto out_dput;
+ goto out_err;
}
+ return dentry;
+out_err:
+ mutex_unlock(&dir->i_mutex);
+ return dentry;
+}
- inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
- if (!inode)
- goto out_dput;
- inode->i_ino = iunique(dir->i_sb, 100);
- dir->i_nlink++;
- RPC_I(dentry->d_inode)->private = rpc_client;
+static struct dentry *
+rpc_lookup_negative(char *path, struct nameidata *nd)
+{
+ struct dentry *dentry;
+ int error;
- d_instantiate(dentry, inode);
- dget(dentry);
- up(&dir->i_sem);
+ if ((error = rpc_lookup_parent(path, nd)) != 0)
+ return ERR_PTR(error);
+ dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len,
+ 1);
+ if (IS_ERR(dentry))
+ rpc_release_path(nd);
+ return dentry;
+}
- inode_dir_notify(dir, DN_CREATE);
+/**
+ * rpc_mkdir - Create a new directory in rpc_pipefs
+ * @path: path from the rpc_pipefs root to the 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_mkdir(char *path, struct rpc_clnt *rpc_client)
+{
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+ dentry = rpc_lookup_negative(path, &nd);
+ if (IS_ERR(dentry))
+ return dentry;
+ dir = nd.path.dentry->d_inode;
+ if ((error = __rpc_mkdir(dir, dentry)) != 0)
+ goto err_dput;
+ RPC_I(dentry->d_inode)->private = rpc_client;
error = rpc_populate(dentry, authfiles,
RPCAUTH_info, RPCAUTH_EOF);
if (error)
- goto out_depopulate;
-
+ goto err_depopulate;
+ dget(dentry);
+out:
+ mutex_unlock(&dir->i_mutex);
+ rpc_release_path(&nd);
return dentry;
-
- out_depopulate:
- rpc_rmdir(dentry);
- out_dput:
+err_depopulate:
+ rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
+ __rpc_rmdir(dir, dentry);
+err_dput:
dput(dentry);
- out_unlock:
- up(&dir->i_sem);
- rpc_put_mount();
- return dentry;
+ printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
+ __FILE__, __func__, path, error);
+ dentry = ERR_PTR(error);
+ goto out;
}
-void
+/**
+ * rpc_rmdir - Remove a directory created with rpc_mkdir()
+ * @dentry: directory to remove
+ */
+int
rpc_rmdir(struct dentry *dentry)
{
- struct dentry *parent = dentry->d_parent;
-
- rpc_depopulate(dentry);
-
- down(&parent->d_inode->i_sem);
- if (dentry->d_inode) {
- rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
- simple_rmdir(parent->d_inode, dentry);
- }
- up(&parent->d_inode->i_sem);
+ struct dentry *parent;
+ struct inode *dir;
+ int error;
- inode_dir_notify(parent->d_inode, DN_DELETE);
- rpc_put_mount();
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+ rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
+ error = __rpc_rmdir(dir, dentry);
+ dput(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, char *name, void *private,
- struct rpc_pipe_ops *ops, int flags)
+rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags)
{
- struct inode *dir = parent->d_inode;
struct dentry *dentry;
- struct inode *inode;
+ struct inode *dir, *inode;
struct rpc_inode *rpci;
- int error;
- error = rpc_get_mount();
- if (error)
- return ERR_PTR(error);
-
- down(&parent->d_inode->i_sem);
- dentry = lookup_one_len(name, parent, strlen(name));
+ dentry = rpc_lookup_create(parent, name, strlen(name), 0);
if (IS_ERR(dentry))
- goto out_unlock;
+ return dentry;
+ dir = parent->d_inode;
if (dentry->d_inode) {
- dentry = ERR_PTR(-EEXIST);
- goto out_dput;
- }
-
- inode = rpc_get_inode(parent->d_inode->i_sb,
- S_IFSOCK | S_IRUSR | S_IWUSR);
- if (!inode) {
- dentry = ERR_PTR(-ENOMEM);
- goto out_dput;
+ rpci = RPC_I(dentry->d_inode);
+ if (rpci->private != private ||
+ rpci->ops != ops ||
+ rpci->flags != flags) {
+ dput (dentry);
+ dentry = ERR_PTR(-EBUSY);
+ }
+ rpci->nkern_readwriters++;
+ goto out;
}
-
+ inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
+ if (!inode)
+ goto err_dput;
inode->i_ino = iunique(dir->i_sb, 100);
inode->i_fop = &rpc_pipe_fops;
-
+ d_instantiate(dentry, inode);
rpci = RPC_I(inode);
rpci->private = private;
rpci->flags = flags;
rpci->ops = ops;
-
- d_instantiate(dentry, inode);
+ rpci->nkern_readwriters = 1;
+ fsnotify_create(dir, dentry);
dget(dentry);
- up(&parent->d_inode->i_sem);
-
- inode_dir_notify(dir, DN_CREATE);
+out:
+ mutex_unlock(&dir->i_mutex);
return dentry;
-
- out_dput:
+err_dput:
dput(dentry);
- out_unlock:
- up(&parent->d_inode->i_sem);
- rpc_put_mount();
- return dentry;
+ dentry = ERR_PTR(-ENOMEM);
+ printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
+ __FILE__, __func__, parent->d_name.name, name,
+ -ENOMEM);
+ goto out;
}
+EXPORT_SYMBOL_GPL(rpc_mkpipe);
-void
+/**
+ * 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 = dentry->d_parent;
+ struct dentry *parent;
+ struct inode *dir;
+ int error = 0;
- down(&parent->d_inode->i_sem);
- if (dentry->d_inode) {
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+ if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
rpc_close_pipes(dentry->d_inode);
- rpc_inode_setowner(dentry->d_inode, NULL);
- simple_unlink(parent->d_inode, dentry);
+ error = simple_unlink(dir, dentry);
+ if (!error)
+ d_delete(dentry);
}
- up(&parent->d_inode->i_sem);
-
- inode_dir_notify(parent->d_inode, DN_DELETE);
- rpc_put_mount();
+ dput(dentry);
+ mutex_unlock(&dir->i_mutex);
+ dput(parent);
+ return error;
}
+EXPORT_SYMBOL_GPL(rpc_unlink);
/*
* populate the filesystem
return -ENOMEM;
}
-static struct super_block *
+static int
rpc_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
- return get_sb_single(fs_type, flags, data, rpc_fill_super);
+ return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
}
static struct file_system_type rpc_pipe_fs_type = {
};
static void
-init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+init_once(void *foo)
{
struct rpc_inode *rpci = (struct rpc_inode *) foo;
- if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
- SLAB_CTOR_CONSTRUCTOR) {
- 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->pipe);
- rpci->pipelen = 0;
- init_waitqueue_head(&rpci->waitq);
- INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci);
- rpci->ops = NULL;
- }
+ 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,
- init_once, NULL);
+ sizeof(struct rpc_inode),
+ 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once);
if (!rpc_inode_cachep)
return -ENOMEM;
- register_filesystem(&rpc_pipe_fs_type);
+ err = register_filesystem(&rpc_pipe_fs_type);
+ if (err) {
+ kmem_cache_destroy(rpc_inode_cachep);
+ return err;
+ }
+
return 0;
}
void unregister_rpc_pipefs(void)
{
- if (kmem_cache_destroy(rpc_inode_cachep))
- printk(KERN_WARNING "RPC: unable to free inode cache\n");
+ kmem_cache_destroy(rpc_inode_cachep);
unregister_filesystem(&rpc_pipe_fs_type);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff