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 #include <linux/smp_lock.h> 27 28 /* pioctl ops */ 29 static int coda_ioctl_permission(struct inode *inode, int mask); 30 static long coda_pioctl(struct file *filp, unsigned int cmd, 31 unsigned long user_data); 32 33 /* exported from this file */ 34 const struct inode_operations coda_ioctl_inode_operations = { 35 .permission = coda_ioctl_permission, 36 .setattr = coda_setattr, 37 }; 38 39 const struct file_operations coda_ioctl_operations = { 40 .owner = THIS_MODULE, 41 .unlocked_ioctl = coda_pioctl, 42 }; 43 44 /* the coda pioctl inode ops */ 45 static int coda_ioctl_permission(struct inode *inode, int mask) 46 { 47 return (mask & MAY_EXEC) ? -EACCES : 0; 48 } 49 50 static long coda_pioctl(struct file *filp, unsigned int cmd, 51 unsigned long user_data) 52 { 53 struct path path; 54 int error; 55 struct PioctlData data; 56 struct inode *inode = filp->f_dentry->d_inode; 57 struct inode *target_inode = NULL; 58 struct coda_inode_info *cnp; 59 60 lock_kernel(); 61 62 /* get the Pioctl data arguments from user space */ 63 if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) { 64 error = -EINVAL; 65 goto out; 66 } 67 68 /* 69 * Look up the pathname. Note that the pathname is in 70 * user memory, and namei takes care of this 71 */ 72 if (data.follow) 73 error = user_path(data.path, &path); 74 else 75 error = user_lpath(data.path, &path); 76 77 if (error) 78 goto out; 79 else 80 target_inode = path.dentry->d_inode; 81 82 /* return if it is not a Coda inode */ 83 if (target_inode->i_sb != inode->i_sb) { 84 path_put(&path); 85 error = -EINVAL; 86 goto out; 87 } 88 89 /* now proceed to make the upcall */ 90 cnp = ITOC(target_inode); 91 92 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); 93 94 path_put(&path); 95 96 out: 97 unlock_kernel(); 98 return error; 99 } 100