overlayfs: make ovl_cache_entry->name an array instead of pointer

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index b7d9fb0..9c9872b 100644 (file)
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -18,13 +18,13 @@
 #include "overlayfs.h"
 
 struct ovl_cache_entry {
-       const char *name;
        unsigned int len;
        unsigned int type;
        u64 ino;
        bool is_whiteout;
        struct list_head l_node;
        struct rb_node node;
+       char name[];
 };
 
 struct ovl_dir_cache {
@@ -82,13 +82,12 @@ static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
                                                   u64 ino, unsigned int d_type)
 {
        struct ovl_cache_entry *p;
+       size_t size = offsetof(struct ovl_cache_entry, name[len + 1]);
 
-       p = kmalloc(sizeof(*p) + len + 1, GFP_KERNEL);
+       p = kmalloc(size, GFP_KERNEL);
        if (p) {
-               char *name_copy = (char *) (p + 1);
-               memcpy(name_copy, name, len);
-               name_copy[len] = '\0';
-               p->name = name_copy;
+               memcpy(p->name, name, len);
+               p->name[len] = '\0';
                p->len = len;
                p->type = d_type;
                p->ino = ino;