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ext4srv: fix ..-walk from a dir under root

--- a/sys/src/cmd/ext4srv/ext4srv.c

+++ b/sys/src/cmd/ext4srv/ext4srv.c

@@ -712,6 +712,8 @@

 	s = isroot ? estrdup9p(name) : smprint("%s/%s", a->path, name);

 	cleanname(s);

+	if(s[0] == '.' && s[1] == 0) /* special case - root */

+		*s = 0;

 	if(ext4_raw_inode_fill(mp, s, &ino, &inode) < 0)

 		goto err;

 	t = ext4_inode_type(a->p->sb, &inode);

-- 

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