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 struct nameidata *nd); 29 static int coda_pioctl(struct inode * inode, struct file * filp, 30 unsigned int cmd, unsigned long user_data); 31 32 /* exported from this file */ 33 const struct inode_operations coda_ioctl_inode_operations = 34 { 35 .permission = coda_ioctl_permission, 36 .setattr = coda_setattr, 37 }; 38 39 const struct file_operations coda_ioctl_operations = { 40 .owner = THIS_MODULE, 41 .ioctl = coda_pioctl, 42 }; 43 44 /* the coda pioctl inode ops */ 45 static int coda_ioctl_permission(struct inode *inode, int mask, 46 struct nameidata *nd) 47 { 48 return 0; 49 } 50 51 static int coda_pioctl(struct inode * inode, struct file * filp, 52 unsigned int cmd, unsigned long user_data) 53 { 54 struct nameidata nd; 55 int error; 56 struct PioctlData data; 57 struct inode *target_inode = NULL; 58 struct coda_inode_info *cnp; 59 60 /* get the Pioctl data arguments from user space */ 61 if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) { 62 return -EINVAL; 63 } 64 65 /* 66 * Look up the pathname. Note that the pathname is in 67 * user memory, and namei takes care of this 68 */ 69 if ( data.follow ) { 70 error = user_path_walk(data.path, &nd); 71 } else { 72 error = user_path_walk_link(data.path, &nd); 73 } 74 75 if ( error ) { 76 return error; 77 } else { 78 target_inode = nd.dentry->d_inode; 79 } 80 81 /* return if it is not a Coda inode */ 82 if ( target_inode->i_sb != inode->i_sb ) { 83 path_release(&nd); 84 return -EINVAL; 85 } 86 87 /* now proceed to make the upcall */ 88 cnp = ITOC(target_inode); 89 90 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); 91 92 path_release(&nd); 93 return error; 94 } 95 96