Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-2.6.git] / net / sunrpc / rpc_pipe.c
index 1f7fc50..52f2524 100644 (file)
@@ -27,7 +27,6 @@
 #include <linux/workqueue.h>
 #include <linux/sunrpc/rpc_pipe_fs.h>
 #include <linux/sunrpc/cache.h>
-#include <linux/smp_lock.h>
 
 static struct vfsmount *rpc_mount __read_mostly;
 static int rpc_mount_count;
@@ -48,7 +47,7 @@ static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
                return;
        do {
                msg = list_entry(head->next, struct rpc_pipe_msg, list);
-               list_del(&msg->list);
+               list_del_init(&msg->list);
                msg->errno = err;
                destroy_msg(msg);
        } while (!list_empty(head));
@@ -208,7 +207,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
        if (msg != NULL) {
                spin_lock(&inode->i_lock);
                msg->errno = -EAGAIN;
-               list_del(&msg->list);
+               list_del_init(&msg->list);
                spin_unlock(&inode->i_lock);
                rpci->ops->destroy_msg(msg);
        }
@@ -268,7 +267,7 @@ rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
        if (res < 0 || msg->len == msg->copied) {
                filp->private_data = NULL;
                spin_lock(&inode->i_lock);
-               list_del(&msg->list);
+               list_del_init(&msg->list);
                spin_unlock(&inode->i_lock);
                rpci->ops->destroy_msg(msg);
        }
@@ -309,40 +308,33 @@ rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
        return mask;
 }
 
-static int
-rpc_pipe_ioctl_unlocked(struct file *filp, unsigned int cmd, unsigned long arg)
+static long
+rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
-       struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
+       struct inode *inode = filp->f_path.dentry->d_inode;
+       struct rpc_inode *rpci = RPC_I(inode);
        int len;
 
        switch (cmd) {
        case FIONREAD:
-               if (rpci->ops == NULL)
+               spin_lock(&inode->i_lock);
+               if (rpci->ops == NULL) {
+                       spin_unlock(&inode->i_lock);
                        return -EPIPE;
+               }
                len = rpci->pipelen;
                if (filp->private_data) {
                        struct rpc_pipe_msg *msg;
                        msg = filp->private_data;
                        len += msg->len - msg->copied;
                }
+               spin_unlock(&inode->i_lock);
                return put_user(len, (int __user *)arg);
        default:
                return -EINVAL;
        }
 }
 
-static long
-rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-       long ret;
-
-       lock_kernel();
-       ret = rpc_pipe_ioctl_unlocked(filp, cmd, arg);
-       unlock_kernel();
-
-       return ret;
-}
-
 static const struct file_operations rpc_pipe_fops = {
        .owner          = THIS_MODULE,
        .llseek         = no_llseek,
@@ -371,21 +363,23 @@ rpc_show_info(struct seq_file *m, void *v)
 static int
 rpc_info_open(struct inode *inode, struct file *file)
 {
-       struct rpc_clnt *clnt;
+       struct rpc_clnt *clnt = NULL;
        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);
+
+               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;
                }
-               mutex_unlock(&inode->i_mutex);
        }
        return ret;
 }