From: Gao Xiang <hsiangkao@linux.alibaba.com>
Date: Mon, 24 Jun 2024 11:59:23 +0000 (+0800)
Subject: erofs-utils: introduce `payload` field in `struct erofs_vfile`
X-Git-Tag: v1.8~34
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d2e97bf6901e98cd8c6c4ce9dabe9b6357be3f78;p=platform%2Fupstream%2Ferofs-utils.git

erofs-utils: introduce `payload` field in `struct erofs_vfile`

Allow customized `vfile` with non-NULL `ops` utilizing `payload`
for additional information.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240624115923.4090196-2-hsiangkao@linux.alibaba.com
---

diff --git a/include/erofs/io.h b/include/erofs/io.h
index 6167bdf..f53abed 100644
--- a/include/erofs/io.h
+++ b/include/erofs/io.h
@@ -37,10 +37,16 @@ struct erofs_vfops {
 		     struct erofs_vfile *vin, int len, bool noseek);
 };
 
+/* don't extend this; instead, use payload for any extra information */
 struct erofs_vfile {
 	struct erofs_vfops *ops;
-	u64 offset;
-	int fd;
+	union {
+		struct {
+			u64 offset;
+			int fd;
+		};
+		u8 payload[16];
+	};
 };
 
 int erofs_io_fstat(struct erofs_vfile *vf, struct stat *buf);