linux-kernel - Re: [patch 09/10] Use struct path in fs

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Message-Id: <200709282239.49088.agruen@suse.de>
Date:	Fri, 28 Sep 2007 22:39:48 +0200
From:	Andreas Gruenbacher <agruen@...e.de>
To:	Christoph Hellwig <hch@....de>
Cc:	jblunck@...e.de, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, tiwai@...e.de
Subject: Re: [patch 09/10] Use struct path in fs_struct

On Friday 28 September 2007 20:42, Christoph Hellwig wrote:
> __d_path should probably switch to taking a struct path * aswell.

Indeed, it now easily can. Here we go...


One less parameter to __d_path

All callers to __d_path pass the dentry and vfsmount of a struct
path to __d_path. Pass the struct path directly, instead.

Signed-off-by: Andreas Gruenbacher <agruen@...e.de>

Index: linux-2.6/fs/dcache.c
===================================================================
--- linux-2.6.orig/fs/dcache.c
+++ linux-2.6/fs/dcache.c
@@ -1781,9 +1781,8 @@ shouldnt_be_hashed:
  *
  * "buflen" should be positive. Caller holds the dcache_lock.
  */
-static char * __d_path( struct dentry *dentry, struct vfsmount *vfsmnt,
-			struct dentry *root, struct vfsmount *rootmnt,
-			char *buffer, int buflen)
+static char * __d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
+		       struct path *root, char *buffer, int buflen)
 {
 	char * end = buffer+buflen;
 	char * retval;
@@ -1808,7 +1807,7 @@ static char * __d_path( struct dentry *d
 	for (;;) {
 		struct dentry * parent;
 
-		if (dentry == root && vfsmnt == rootmnt)
+		if (dentry == root->dentry && vfsmnt == root->mnt)
 			break;
 		if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
 			/* Global root? */
@@ -1870,7 +1869,7 @@ char * d_path(struct dentry *dentry, str
 	root = *path_get(&current->fs->root);
 	read_unlock(&current->fs->lock);
 	spin_lock(&dcache_lock);
-	res = __d_path(dentry, vfsmnt, root.dentry, root.mnt, buf, buflen);
+	res = __d_path(dentry, vfsmnt, &root, buf, buflen);
 	spin_unlock(&dcache_lock);
 	path_put(&root);
 	return res;
@@ -1936,8 +1935,7 @@ asmlinkage long sys_getcwd(char __user *
 		unsigned long len;
 		char * cwd;
 
-		cwd = __d_path(pwd.dentry, pwd.mnt, root.dentry, root.mnt,
-			       page, PAGE_SIZE);
+		cwd = __d_path(pwd.dentry, pwd.mnt, &root, page, PAGE_SIZE);
 		spin_unlock(&dcache_lock);
 
 		error = PTR_ERR(cwd);
-
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