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TOMOYO Linux Cross Reference
Linux/fs/coda/pioctl.c

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  1 /*
  2  * Pioctl operations for Coda.
  3  * Original version: (C) 1996 Peter Braam
  4  * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
  5  *
  6  * Carnegie Mellon encourages users of this code to contribute improvements
  7  * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
  8  */
  9 
 10 #include <linux/types.h>
 11 #include <linux/kernel.h>
 12 #include <linux/time.h>
 13 #include <linux/fs.h>
 14 #include <linux/stat.h>
 15 #include <linux/errno.h>
 16 #include <linux/string.h>
 17 #include <linux/namei.h>
 18 #include <linux/module.h>
 19 #include <linux/uaccess.h>
 20 
 21 #include <linux/coda.h>
 22 #include <linux/coda_psdev.h>
 23 
 24 #include "coda_linux.h"
 25 
 26 /* pioctl ops */
 27 static int coda_ioctl_permission(struct inode *inode, int mask);
 28 static long coda_pioctl(struct file *filp, unsigned int cmd,
 29                         unsigned long user_data);
 30 
 31 /* exported from this file */
 32 const struct inode_operations coda_ioctl_inode_operations = {
 33         .permission     = coda_ioctl_permission,
 34         .setattr        = coda_setattr,
 35 };
 36 
 37 const struct file_operations coda_ioctl_operations = {
 38         .owner          = THIS_MODULE,
 39         .unlocked_ioctl = coda_pioctl,
 40         .llseek         = noop_llseek,
 41 };
 42 
 43 /* the coda pioctl inode ops */
 44 static int coda_ioctl_permission(struct inode *inode, int mask)
 45 {
 46         return (mask & MAY_EXEC) ? -EACCES : 0;
 47 }
 48 
 49 static long coda_pioctl(struct file *filp, unsigned int cmd,
 50                         unsigned long user_data)
 51 {
 52         struct path path;
 53         int error;
 54         struct PioctlData data;
 55         struct inode *inode = file_inode(filp);
 56         struct inode *target_inode = NULL;
 57         struct coda_inode_info *cnp;
 58 
 59         /* get the Pioctl data arguments from user space */
 60         if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
 61                 return -EINVAL;
 62 
 63         /*
 64          * Look up the pathname. Note that the pathname is in
 65          * user memory, and namei takes care of this
 66          */
 67         if (data.follow)
 68                 error = user_path(data.path, &path);
 69         else
 70                 error = user_lpath(data.path, &path);
 71 
 72         if (error)
 73                 return error;
 74 
 75         target_inode = d_inode(path.dentry);
 76 
 77         /* return if it is not a Coda inode */
 78         if (target_inode->i_sb != inode->i_sb) {
 79                 error = -EINVAL;
 80                 goto out;
 81         }
 82 
 83         /* now proceed to make the upcall */
 84         cnp = ITOC(target_inode);
 85 
 86         error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
 87 out:
 88         path_put(&path);
 89         return error;
 90 }
 91 

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