4ac9137858
This is the central patch of a cleanup series. In most cases there is no good
reason why someone would want to use a dentry for itself. This series reflects
that fact and embeds a struct path into nameidata.
Together with the other patches of this series
- it enforced the correct order of getting/releasing the reference count on
<dentry,vfsmount> pairs
- it prepares the VFS for stacking support since it is essential to have a
struct path in every place where the stack can be traversed
- it reduces the overall code size:
without patch series:
text data bss dec hex filename
5321639 858418 715768 6895825 6938d1 vmlinux
with patch series:
text data bss dec hex filename
5320026 858418 715768 6894212 693284 vmlinux
This patch:
Switch from nd->{dentry,mnt} to nd->path.{dentry,mnt} everywhere.
[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix cifs]
[akpm@linux-foundation.org: fix smack]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
96 lines
2.4 KiB
C
96 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.path.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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