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Commit 9883d185 authored by Al Viro's avatar Al Viro
Browse files

namei: move saved_nd pointer into struct nameidata 



these guys are always declared next to each other; might as well put
the former (pointer to previous instance) into the latter and simplify
the calling conventions for {set,restore}_nameidata()

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 520ae687

fs/namei.c

+24 −22
Original line number Diff line number Diff line
@@ -498,10 +498,8 @@ struct nameidata { 
	struct qstr	last;

	struct path	root;

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

	struct filename	*name;

	int		dfd;

	unsigned int	flags;

	unsigned	seq, m_seq, root_seq;

	unsigned	seq, m_seq;

	int		last_type;

	unsigned	depth;

	int		total_link_count;
@@ -512,23 +510,26 @@ struct nameidata { 
		struct inode *inode;

		unsigned seq;

	} *stack, internal[EMBEDDED_LEVELS];

	struct filename	*name;

	struct nameidata *saved;

	unsigned	root_seq;

	int		dfd;

};



static struct nameidata *set_nameidata(struct nameidata *p, int dfd,

					struct filename *name)

static void set_nameidata(struct nameidata *p, int dfd, struct filename *name)

{

	struct nameidata *old = current->nameidata;

	p->stack = p->internal;

	p->dfd = dfd;

	p->name = name;

	p->total_link_count = old ? old->total_link_count : 0;

	p->saved = old;

	current->nameidata = p;

	return old;

}



static void restore_nameidata(struct nameidata *old)

static void restore_nameidata(void)

{

	struct nameidata *now = current->nameidata;

	struct nameidata *now = current->nameidata, *old = now->saved;



	current->nameidata = old;

	if (old)
@@ -2120,14 +2121,14 @@ static int filename_lookup(int dfd, struct filename *name, unsigned flags, 
			   struct path *path, struct path *root)

{

	int retval;

	struct nameidata nd, *saved_nd;

	struct nameidata nd;

	if (IS_ERR(name))

		return PTR_ERR(name);

	saved_nd = set_nameidata(&nd, dfd, name);

	if (unlikely(root)) {

		nd.root = *root;

		flags |= LOOKUP_ROOT;

	}

	set_nameidata(&nd, dfd, name);

	retval = path_lookupat(&nd, flags | LOOKUP_RCU, path);

	if (unlikely(retval == -ECHILD))

		retval = path_lookupat(&nd, flags, path);
@@ -2136,7 +2137,7 @@ static int filename_lookup(int dfd, struct filename *name, unsigned flags, 


	if (likely(!retval))

		audit_inode(name, path->dentry, flags & LOOKUP_PARENT);

	restore_nameidata(saved_nd);

	restore_nameidata();

	putname(name);

	return retval;

}
@@ -2166,11 +2167,11 @@ static struct filename *filename_parentat(int dfd, struct filename *name, 
				struct qstr *last, int *type)

{

	int retval;

	struct nameidata nd, *saved_nd;

	struct nameidata nd;



	if (IS_ERR(name))

		return name;

	saved_nd = set_nameidata(&nd, dfd, name);

	set_nameidata(&nd, dfd, name);

	retval = path_parentat(&nd, flags | LOOKUP_RCU, parent);

	if (unlikely(retval == -ECHILD))

		retval = path_parentat(&nd, flags, parent);
@@ -2184,7 +2185,7 @@ static struct filename *filename_parentat(int dfd, struct filename *name, 
		putname(name);

		name = ERR_PTR(retval);

	}

	restore_nameidata(saved_nd);

	restore_nameidata();

	return name;

}
@@ -2445,11 +2446,11 @@ static int 
filename_mountpoint(int dfd, struct filename *name, struct path *path,

			unsigned int flags)

{

	struct nameidata nd, *saved;

	struct nameidata nd;

	int error;

	if (IS_ERR(name))

		return PTR_ERR(name);

	saved = set_nameidata(&nd, dfd, name);

	set_nameidata(&nd, dfd, name);

	error = path_mountpoint(&nd, flags | LOOKUP_RCU, path);

	if (unlikely(error == -ECHILD))

		error = path_mountpoint(&nd, flags, path);
@@ -2457,7 +2458,7 @@ filename_mountpoint(int dfd, struct filename *name, struct path *path, 
		error = path_mountpoint(&nd, flags | LOOKUP_REVAL, path);

	if (likely(!error))

		audit_inode(name, path->dentry, 0);

	restore_nameidata(saved);

	restore_nameidata();

	putname(name);

	return error;

}
@@ -3327,23 +3328,24 @@ static struct file *path_openat(struct nameidata *nd, 
struct file *do_filp_open(int dfd, struct filename *pathname,

		const struct open_flags *op)

{

	struct nameidata nd, *saved_nd = set_nameidata(&nd, dfd, pathname);

	struct nameidata nd;

	int flags = op->lookup_flags;

	struct file *filp;



	set_nameidata(&nd, dfd, pathname);

	filp = path_openat(&nd, op, flags | LOOKUP_RCU);

	if (unlikely(filp == ERR_PTR(-ECHILD)))

		filp = path_openat(&nd, op, flags);

	if (unlikely(filp == ERR_PTR(-ESTALE)))

		filp = path_openat(&nd, op, flags | LOOKUP_REVAL);

	restore_nameidata(saved_nd);

	restore_nameidata();

	return filp;

}



struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,

		const char *name, const struct open_flags *op)

{

	struct nameidata nd, *saved_nd;

	struct nameidata nd;

	struct file *file;

	struct filename *filename;

	int flags = op->lookup_flags | LOOKUP_ROOT;
@@ -3358,13 +3360,13 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt, 
	if (unlikely(IS_ERR(filename)))

		return ERR_CAST(filename);



	saved_nd = set_nameidata(&nd, -1, filename);

	set_nameidata(&nd, -1, filename);

	file = path_openat(&nd, op, flags | LOOKUP_RCU);

	if (unlikely(file == ERR_PTR(-ECHILD)))

		file = path_openat(&nd, op, flags);

	if (unlikely(file == ERR_PTR(-ESTALE)))

		file = path_openat(&nd, op, flags | LOOKUP_REVAL);

	restore_nameidata(saved_nd);

	restore_nameidata();

	putname(filename);

	return file;

}