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754661f143
Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* Pioctl operations for Coda.
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* Original version: (C) 1996 Peter Braam
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* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
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*
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* Carnegie Mellon encourages users of this code to contribute improvements
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* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/namei.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <linux/coda.h>
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#include <linux/coda_linux.h>
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#include <linux/coda_fs_i.h>
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#include <linux/coda_psdev.h>
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/* pioctl ops */
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static int coda_ioctl_permission(struct inode *inode, int mask,
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struct nameidata *nd);
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static int coda_pioctl(struct inode * inode, struct file * filp,
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unsigned int cmd, unsigned long user_data);
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/* exported from this file */
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const struct inode_operations coda_ioctl_inode_operations =
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{
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.permission = coda_ioctl_permission,
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.setattr = coda_setattr,
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};
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const struct file_operations coda_ioctl_operations = {
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.owner = THIS_MODULE,
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.ioctl = coda_pioctl,
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};
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/* the coda pioctl inode ops */
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static int coda_ioctl_permission(struct inode *inode, int mask,
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struct nameidata *nd)
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{
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return 0;
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}
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static int coda_pioctl(struct inode * inode, struct file * filp,
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unsigned int cmd, unsigned long user_data)
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{
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struct nameidata nd;
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int error;
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struct PioctlData data;
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struct inode *target_inode = NULL;
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struct coda_inode_info *cnp;
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/* get the Pioctl data arguments from user space */
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if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {
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return -EINVAL;
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}
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/*
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* Look up the pathname. Note that the pathname is in
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* user memory, and namei takes care of this
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*/
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if ( data.follow ) {
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error = user_path_walk(data.path, &nd);
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} else {
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error = user_path_walk_link(data.path, &nd);
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}
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if ( error ) {
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return error;
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} else {
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target_inode = nd.dentry->d_inode;
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}
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/* return if it is not a Coda inode */
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if ( target_inode->i_sb != inode->i_sb ) {
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path_release(&nd);
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return -EINVAL;
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}
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/* now proceed to make the upcall */
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cnp = ITOC(target_inode);
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error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
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path_release(&nd);
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return error;
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}
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