[PATCH] erofs-utils: mkfs: twist calculation of shared_xattr_id

[Jingbo Xu]

The on-disk format specifies that share xattr can be addressed by:

  xattr offset = xattr_blkaddr * block_size + 4 * shared_xattr_id

That is, the shared_xattr_id is calculated from the xattr offset
(starting from xattr_blkaddr) divided by 4.  Make this semantics
explicitly by calculating the divisor from 'sizeof(__le32)'.

It has no logic change.

Signed-off-by: Jingbo Xu <jefflexu at linux.alibaba.com>
---
 lib/xattr.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/xattr.c b/lib/xattr.c
index dbe0519..1cd04cf 100644
--- a/lib/xattr.c
+++ b/lib/xattr.c
@@ -643,8 +643,7 @@ int erofs_build_shared_xattrs_from_path(const char *path)
 			.e_value_size = cpu_to_le16(item->len[1])
 		};
 
-		item->shared_xattr_id = (off + p) /
-			sizeof(struct erofs_xattr_entry);
+		item->shared_xattr_id = (off + p) / sizeof(__le32);
 
 		memcpy(buf + p, &entry, sizeof(entry));
 		p += sizeof(struct erofs_xattr_entry);
-- 
2.19.1.6.gb485710b