/* * Pioctl operations for Coda. * Original version: (C) 1996 Peter Braam * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University * * Carnegie Mellon encourages users of this code to contribute improvements * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/time.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/namei.h> #include <linux/module.h> #include <asm/uaccess.h> #include <linux/coda.h> #include <linux/coda_linux.h> #include <linux/coda_fs_i.h> #include <linux/coda_psdev.h> /* pioctl ops */ static int coda_ioctl_permission(struct inode *inode, int mask, struct nameidata *nd); static int coda_pioctl(struct inode * inode, struct file * filp, unsigned int cmd, unsigned long user_data); /* exported from this file */ const struct inode_operations coda_ioctl_inode_operations = { .permission = coda_ioctl_permission, .setattr = coda_setattr, }; const struct file_operations coda_ioctl_operations = { .owner = THIS_MODULE, .ioctl = coda_pioctl, }; /* the coda pioctl inode ops */ static int coda_ioctl_permission(struct inode *inode, int mask, struct nameidata *nd) { return 0; } static int coda_pioctl(struct inode * inode, struct file * filp, unsigned int cmd, unsigned long user_data) { struct nameidata nd; int error; struct PioctlData data; struct inode *target_inode = NULL; struct coda_inode_info *cnp; /* get the Pioctl data arguments from user space */ if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) { return -EINVAL; } /* * Look up the pathname. Note that the pathname is in * user memory, and namei takes care of this */ if ( data.follow ) { error = user_path_walk(data.path, &nd); } else { error = user_path_walk_link(data.path, &nd); } if ( error ) { return error; } else { target_inode = nd.path.dentry->d_inode; } /* return if it is not a Coda inode */ if ( target_inode->i_sb != inode->i_sb ) { path_put(&nd.path); return -EINVAL; } /* now proceed to make the upcall */ cnp = ITOC(target_inode); error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); path_put(&nd.path); return error; }