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Commit 1cf2665b authored by Al Viro's avatar Al Viro
Browse files

namei: kill nd->link 



Just store it in nd->stack[nd->depth].link right in pick_link().
Now that we make sure of stack expansion in pick_link(), we can
do so...

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent fec2fa24

fs/namei.c

+8 −10
Original line number Diff line number Diff line
@@ -495,10 +495,7 @@ EXPORT_SYMBOL(path_put); 
#define EMBEDDED_LEVELS 2

struct nameidata {

	struct path	path;

	union {

	struct qstr	last;

		struct path	link;

	};

	struct path	root;

	struct inode	*inode; /* path.dentry.d_inode */

	unsigned int	flags;
@@ -787,7 +784,7 @@ static inline int may_follow_link(struct nameidata *nd) 
		return 0;



	/* Allowed if owner and follower match. */

	inode = nd->link.dentry->d_inode;

	inode = nd->stack[0].link.dentry->d_inode;

	if (uid_eq(current_cred()->fsuid, inode->i_uid))

		return 0;
@@ -800,8 +797,8 @@ static inline int may_follow_link(struct nameidata *nd) 
	if (uid_eq(parent->i_uid, inode->i_uid))

		return 0;



	audit_log_link_denied("follow_link", &nd->link);

	path_put(&nd->link);

	audit_log_link_denied("follow_link", &nd->stack[0].link);

	path_put(&nd->stack[0].link);

	path_put(&nd->path);

	return -EACCES;

}
@@ -879,14 +876,13 @@ static __always_inline 
const char *get_link(struct nameidata *nd)

{

	struct saved *last = nd->stack + nd->depth;

	struct dentry *dentry = nd->link.dentry;

	struct dentry *dentry = last->link.dentry;

	struct inode *inode = dentry->d_inode;

	int error;

	const char *res;



	BUG_ON(nd->flags & LOOKUP_RCU);



	last->link = nd->link;

	last->cookie = NULL;

	nd->depth++;
@@ -1560,6 +1556,7 @@ static void terminate_walk(struct nameidata *nd) 
static int pick_link(struct nameidata *nd, struct path *link)

{

	int error;

	struct saved *last;

	if (unlikely(nd->total_link_count++ >= MAXSYMLINKS)) {

		path_to_nameidata(link, nd);

		return -ELOOP;
@@ -1578,7 +1575,8 @@ static int pick_link(struct nameidata *nd, struct path *link) 
		return error;

	}



	nd->link = *link;

	last = nd->stack + nd->depth;

	last->link = *link;

	return 1;

}