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-rw-r--r--fs/coda/pioctl.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/fs/coda/pioctl.c b/fs/coda/pioctl.c
new file mode 100644
index 000000000..36e35c155
--- /dev/null
+++ b/fs/coda/pioctl.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 "coda_psdev.h"
+#include "coda_linux.h"
+
+/* pioctl ops */
+static int coda_ioctl_permission(struct mnt_idmap *idmap,
+ 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 = {
+ .unlocked_ioctl = coda_pioctl,
+ .llseek = noop_llseek,
+};
+
+/* the coda pioctl inode ops */
+static int coda_ioctl_permission(struct mnt_idmap *idmap,
+ 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
+ */
+ error = user_path_at(AT_FDCWD, data.path,
+ data.follow ? LOOKUP_FOLLOW : 0, &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;
+}