1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Pioctl operations for Coda. 4 * Original version: (C) 1996 Peter Braam 5 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University 6 * 7 * Carnegie Mellon encourages users of this code to contribute improvements 8 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. 9 */ 10 11 #include <linux/types.h> 12 #include <linux/kernel.h> 13 #include <linux/time.h> 14 #include <linux/fs.h> 15 #include <linux/stat.h> 16 #include <linux/errno.h> 17 #include <linux/string.h> 18 #include <linux/namei.h> 19 #include <linux/module.h> 20 #include <linux/uaccess.h> 21 22 #include <linux/coda.h> 23 #include "coda_psdev.h" 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 .unlocked_ioctl = coda_pioctl, 39 .llseek = noop_llseek, 40 }; 41 42 /* the coda pioctl inode ops */ 43 static int coda_ioctl_permission(struct inode *inode, int mask) 44 { 45 return (mask & MAY_EXEC) ? -EACCES : 0; 46 } 47 48 static long coda_pioctl(struct file *filp, unsigned int cmd, 49 unsigned long user_data) 50 { 51 struct path path; 52 int error; 53 struct PioctlData data; 54 struct inode *inode = file_inode(filp); 55 struct inode *target_inode = NULL; 56 struct coda_inode_info *cnp; 57 58 /* get the Pioctl data arguments from user space */ 59 if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) 60 return -EINVAL; 61 62 /* 63 * Look up the pathname. Note that the pathname is in 64 * user memory, and namei takes care of this 65 */ 66 if (data.follow) 67 error = user_path(data.path, &path); 68 else 69 error = user_lpath(data.path, &path); 70 71 if (error) 72 return error; 73 74 target_inode = d_inode(path.dentry); 75 76 /* return if it is not a Coda inode */ 77 if (target_inode->i_sb != inode->i_sb) { 78 error = -EINVAL; 79 goto out; 80 } 81 82 /* now proceed to make the upcall */ 83 cnp = ITOC(target_inode); 84 85 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); 86 out: 87 path_put(&path); 88 return error; 89 } 90