Commit 6dfd9fe5 authored by Al Viro's avatar Al Viro
Browse files

follow_dotdot{,_rcu}(): switch to use of step_into() 



gets the regular mount crossing on result of ..

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7521f22b

fs/namei.c

+7 −24
Original line number Diff line number Diff line
@@ -1722,33 +1722,18 @@ static const char *follow_dotdot_rcu(struct nameidata *nd) 
			/* we know that mountpoint was pinned */

			nd->path.dentry = mountpoint;

			nd->path.mnt = &mparent->mnt;

			inode = inode2;

			inode = nd->inode = inode2;

			nd->seq = seq;

		}

	}

	if (unlikely(!parent)) {

		if (unlikely(nd->flags & LOOKUP_BENEATH))

			return ERR_PTR(-ECHILD);

		return step_into(nd, WALK_NOFOLLOW,

				 nd->path.dentry, nd->inode, nd->seq);

	} else {

		nd->path.dentry = parent;

		nd->seq = seq;

	}

	while (unlikely(d_mountpoint(nd->path.dentry))) {

		struct mount *mounted;

		mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry);

		if (unlikely(read_seqretry(&mount_lock, nd->m_seq)))

			return ERR_PTR(-ECHILD);

		if (!mounted)

			break;

		if (unlikely(nd->flags & LOOKUP_NO_XDEV))

			return ERR_PTR(-ECHILD);

		nd->path.mnt = &mounted->mnt;

		nd->path.dentry = mounted->mnt.mnt_root;

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

		nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);

		return step_into(nd, WALK_NOFOLLOW, parent, inode, seq);

	}

	nd->inode = inode;

	return NULL;

}



static const char *follow_dotdot(struct nameidata *nd)
@@ -1774,13 +1759,11 @@ static const char *follow_dotdot(struct nameidata *nd) 
	if (unlikely(!parent)) {

		if (unlikely(nd->flags & LOOKUP_BENEATH))

			return ERR_PTR(-EXDEV);

		return step_into(nd, WALK_NOFOLLOW,

				 dget(nd->path.dentry), nd->inode, nd->seq);

	} else {

		dput(nd->path.dentry);

		nd->path.dentry = parent;

		return step_into(nd, WALK_NOFOLLOW, parent, parent->d_inode, 0);

	}

	follow_mount(&nd->path);

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

	return NULL;

}



static const char *handle_dots(struct nameidata *nd, int type)