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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 <asm/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, unsigned int flags); |
| 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, unsigned int flags) |
| 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 = filp->f_dentry->d_inode; |
| 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 = path.dentry->d_inode; |
| 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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