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 <asm/uaccess.h> 20 21 #include <linux/coda.h> 22 #include <linux/coda_linux.h> 23 #include <linux/coda_fs_i.h> 24 #include <linux/coda_psdev.h> 25 26 /* pioctl ops */ 27 static int coda_ioctl_permission(struct inode *inode, int mask); 28 static int coda_pioctl(struct inode * inode, struct file * filp, 29 unsigned int cmd, unsigned long user_data); 30 31 /* exported from this file */ 32 const struct inode_operations coda_ioctl_inode_operations = 33 { 34 .permission = coda_ioctl_permission, 35 .setattr = coda_setattr, 36 }; 37 38 const struct file_operations coda_ioctl_operations = { 39 .owner = THIS_MODULE, 40 .ioctl = coda_pioctl, 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 int coda_pioctl(struct inode * inode, struct file * filp, 50 unsigned int cmd, unsigned long user_data) 51 { 52 struct path path; 53 int error; 54 struct PioctlData data; 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 /* 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 73 if ( error ) { 74 return error; 75 } else { 76 target_inode = path.dentry->d_inode; 77 } 78 79 /* return if it is not a Coda inode */ 80 if ( target_inode->i_sb != inode->i_sb ) { 81 path_put(&path); 82 return -EINVAL; 83 } 84 85 /* now proceed to make the upcall */ 86 cnp = ITOC(target_inode); 87 88 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); 89 90 path_put(&path); 91 return error; 92 } 93 94