#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>
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)
{
wake_up(&rpci->waitq);
return res;
}
+EXPORT_SYMBOL(rpc_queue_upcall);
static inline void
rpc_inode_setowner(struct inode *inode, void *private)
rpci->nwriters = 0;
if (ops->release_pipe)
ops->release_pipe(inode);
- cancel_delayed_work(&rpci->queue_timeout);
- flush_workqueue(rpciod_workqueue);
+ cancel_delayed_work_sync(&rpci->queue_timeout);
}
rpc_inode_setowner(inode, NULL);
mutex_unlock(&inode->i_mutex);
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;
}
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;
}
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);
simple_release_fs(&rpc_mount, &rpc_mount_count);
}
+static int rpc_delete_dentry(struct dentry *dentry)
+{
+ return 1;
+}
+
+static struct dentry_operations rpc_dentry_operations = {
+ .d_delete = rpc_delete_dentry,
+};
+
static int
rpc_lookup_parent(char *path, struct nameidata *nd)
{
+ struct vfsmount *mnt;
+
if (path[0] == '\0')
return -ENOENT;
- nd->mnt = rpc_get_mount();
- if (IS_ERR(nd->mnt)) {
+
+ mnt = rpc_get_mount();
+ if (IS_ERR(mnt)) {
printk(KERN_WARNING "%s: %s failed to mount "
"pseudofilesystem \n", __FILE__, __FUNCTION__);
- return PTR_ERR(nd->mnt);
+ return PTR_ERR(mnt);
}
- mntget(nd->mnt);
- nd->dentry = dget(rpc_mount->mnt_root);
- nd->last_type = LAST_ROOT;
- nd->flags = LOOKUP_PARENT;
- nd->depth = 0;
- if (path_walk(path, nd)) {
+ if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) {
printk(KERN_WARNING "%s: %s failed to find path %s\n",
__FILE__, __FUNCTION__, path);
rpc_put_mount();
/*
* 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;
spin_lock(&dcache_lock);
list_for_each_safe(pos, next, &parent->d_subdirs) {
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);
+ if (S_ISREG(dentry->d_inode->i_mode))
simple_unlink(dir, dentry);
- }
- inode_dir_notify(dir, DN_DELETE);
+ else if (S_ISDIR(dentry->d_inode->i_mode))
+ simple_rmdir(dir, dentry);
+ d_delete(dentry);
dput(dentry);
} while (n);
goto repeat;
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 (S_ISDIR(mode))
inc_nlink(dir);
d_add(dentry, inode);
+ fsnotify_create(dir, dentry);
}
mutex_unlock(&dir->i_mutex);
return 0;
inode->i_ino = iunique(dir->i_sb, 100);
d_instantiate(dentry, inode);
inc_nlink(dir);
- inode_dir_notify(dir, DN_CREATE);
+ fsnotify_mkdir(dir, dentry);
return 0;
out_err:
printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
__rpc_rmdir(struct inode *dir, struct dentry *dentry)
{
int error;
-
- shrink_dcache_parent(dentry);
- if (d_unhashed(dentry))
- return 0;
- if ((error = simple_rmdir(dir, dentry)) != 0)
- return error;
- if (!error) {
- inode_dir_notify(dir, DN_DELETE);
- d_drop(dentry);
- }
- return 0;
+ error = simple_rmdir(dir, dentry);
+ if (!error)
+ d_delete(dentry);
+ return error;
}
static struct dentry *
-rpc_lookup_create(struct dentry *parent, const char *name, int len)
+rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
{
struct inode *dir = parent->d_inode;
struct dentry *dentry;
dentry = lookup_one_len(name, parent, len);
if (IS_ERR(dentry))
goto out_err;
- if (dentry->d_inode) {
+ if (!dentry->d_inode)
+ dentry->d_op = &rpc_dentry_operations;
+ else if (exclusive) {
dput(dentry);
dentry = ERR_PTR(-EEXIST);
goto out_err;
if ((error = rpc_lookup_parent(path, nd)) != 0)
return ERR_PTR(error);
- dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len);
+ dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len, 1);
if (IS_ERR(dentry))
rpc_release_path(nd);
return dentry;
}
-
+/**
+ * rpc_mkdir - Create a new directory in rpc_pipefs
+ * @path: path from the rpc_pipefs root to the new directory
+ * @rpc_clnt: 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)
{
rpc_release_path(&nd);
return dentry;
err_depopulate:
- rpc_depopulate(dentry);
+ rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
__rpc_rmdir(dir, dentry);
err_dput:
dput(dentry);
goto out;
}
+/**
+ * rpc_rmdir - Remove a directory created with rpc_mkdir()
+ * @dentry: directory to remove
+ */
int
rpc_rmdir(struct dentry *dentry)
{
parent = dget_parent(dentry);
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
- rpc_depopulate(dentry);
+ rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
error = __rpc_rmdir(dir, dentry);
dput(dentry);
mutex_unlock(&dir->i_mutex);
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, and destroy_msg.
+ *
+ * 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, struct rpc_pipe_ops *ops, int flags)
{
struct inode *dir, *inode;
struct rpc_inode *rpci;
- dentry = rpc_lookup_create(parent, name, strlen(name));
+ dentry = rpc_lookup_create(parent, name, strlen(name), 0);
if (IS_ERR(dentry))
return dentry;
dir = parent->d_inode;
+ if (dentry->d_inode) {
+ 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;
rpci->private = private;
rpci->flags = flags;
rpci->ops = ops;
- inode_dir_notify(dir, DN_CREATE);
+ rpci->nkern_readwriters = 1;
+ fsnotify_create(dir, dentry);
dget(dentry);
out:
mutex_unlock(&dir->i_mutex);
-ENOMEM);
goto out;
}
+EXPORT_SYMBOL(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)
{
parent = dget_parent(dentry);
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
- if (!d_unhashed(dentry)) {
- d_drop(dentry);
- if (dentry->d_inode) {
- rpc_close_pipes(dentry->d_inode);
- error = simple_unlink(dir, dentry);
- }
- inode_dir_notify(dir, DN_DELETE);
+ if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
+ rpc_close_pipes(dentry->d_inode);
+ error = simple_unlink(dir, dentry);
+ if (!error)
+ d_delete(dentry);
}
dput(dentry);
mutex_unlock(&dir->i_mutex);
dput(parent);
return error;
}
+EXPORT_SYMBOL(rpc_unlink);
/*
* populate the filesystem
};
static void
-init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
+init_once(struct kmem_cache * cachep, void *foo)
{
struct rpc_inode *rpci = (struct rpc_inode *) foo;
- if (flags & 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_DELAYED_WORK(&rpci->queue_timeout,
- rpc_timeout_upcall_queue);
- 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)
sizeof(struct rpc_inode),
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
- init_once, NULL);
+ init_once);
if (!rpc_inode_cachep)
return -ENOMEM;
err = register_filesystem(&rpc_pipe_fs_type);