staging: erofs: move erofs_xattr_handlers to xattr.h

Let's move independent xattr-related stuffs to xattr.h.
No logic changes.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/internal.h

@@ -580,11 +580,6 @@ int erofs_namei(struct inode *dir, struct qstr *name,
 /* dir.c */
 extern const struct file_operations erofs_dir_fops;
 
-#ifdef CONFIG_EROFS_FS_XATTR
-/* xattr.c */
-extern const struct xattr_handler *erofs_xattr_handlers[];
-#endif
-
 static inline void *erofs_vmap(struct page **pages, unsigned int count)
 {
 #ifdef CONFIG_EROFS_FS_USE_VM_MAP_RAM

drivers/staging/erofs/super.c

@@ -16,6 +16,7 @@
 #include <linux/parser.h>
 #include <linux/seq_file.h>
 #include "internal.h"
+#include "xattr.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/erofs.h>

drivers/staging/erofs/xattr.h

@@ -68,6 +68,8 @@ static const struct xattr_handler *xattr_handler_map[] = {
 }
 
 #ifdef CONFIG_EROFS_FS_XATTR
+extern const struct xattr_handler *erofs_xattr_handlers[];
+
 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
 #else