Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / coda / pioctl.c

diff --git a/kernel/fs/coda/pioctl.c b/kernel/fs/coda/pioctl.c
new file mode 100644 (file)
index 0000000..f36a404
--- /dev/null
+++ b/kernel/fs/coda/pioctl.c
@@ -0,0 +1,90 @@
+/*
+ * Pioctl operations for Coda.
+ * Original version: (C) 1996 Peter Braam
+ * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
+ *
+ * Carnegie Mellon encourages users of this code to contribute improvements
+ * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/namei.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+#include <linux/coda.h>
+#include <linux/coda_psdev.h>
+
+#include "coda_linux.h"
+
+/* pioctl ops */
+static int coda_ioctl_permission(struct inode *inode, int mask);
+static long coda_pioctl(struct file *filp, unsigned int cmd,
+                       unsigned long user_data);
+
+/* exported from this file */
+const struct inode_operations coda_ioctl_inode_operations = {
+       .permission     = coda_ioctl_permission,
+       .setattr        = coda_setattr,
+};
+
+const struct file_operations coda_ioctl_operations = {
+       .owner          = THIS_MODULE,
+       .unlocked_ioctl = coda_pioctl,
+       .llseek         = noop_llseek,
+};
+
+/* the coda pioctl inode ops */
+static int coda_ioctl_permission(struct inode *inode, int mask)
+{
+       return (mask & MAY_EXEC) ? -EACCES : 0;
+}
+
+static long coda_pioctl(struct file *filp, unsigned int cmd,
+                       unsigned long user_data)
+{
+       struct path path;
+       int error;
+       struct PioctlData data;
+       struct inode *inode = file_inode(filp);
+       struct inode *target_inode = NULL;
+       struct coda_inode_info *cnp;
+
+       /* get the Pioctl data arguments from user space */
+       if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
+               return -EINVAL;
+
+       /*
+        * Look up the pathname. Note that the pathname is in
+        * user memory, and namei takes care of this
+        */
+       if (data.follow)
+               error = user_path(data.path, &path);
+       else
+               error = user_lpath(data.path, &path);
+
+       if (error)
+               return error;
+
+       target_inode = d_inode(path.dentry);
+
+       /* return if it is not a Coda inode */
+       if (target_inode->i_sb != inode->i_sb) {
+               error = -EINVAL;
+               goto out;
+       }
+
+       /* now proceed to make the upcall */
+       cnp = ITOC(target_inode);
+
+       error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
+out:
+       path_put(&path);
+       return error;
+}