linux-kernel - [PATCH] erofs: fix block count report when 48-bit layout is on

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Message-ID: <20250807082019.3093539-1-hsiangkao@linux.alibaba.com>
Date: Thu,  7 Aug 2025 16:20:19 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: linux-erofs@...ts.ozlabs.org
Cc: LKML <linux-kernel@...r.kernel.org>,
	Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: [PATCH] erofs: fix block count report when 48-bit layout is on

Fix incorrect shift order when combining the 48-bit block count.

Fixes: 2e1473d5195f ("erofs: implement 48-bit block addressing for unencoded inodes")
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index e1020aa60771..4ca7ab4e1e82 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -313,8 +313,8 @@ static int erofs_read_superblock(struct super_block *sb)
 	sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
 	if (erofs_sb_has_48bit(sbi) && dsb->rootnid_8b) {
 		sbi->root_nid = le64_to_cpu(dsb->rootnid_8b);
-		sbi->dif0.blocks = (sbi->dif0.blocks << 32) |
-				le16_to_cpu(dsb->rb.blocks_hi);
+		sbi->dif0.blocks = sbi->dif0.blocks |
+				((u64)le16_to_cpu(dsb->rb.blocks_hi) << 32);
 	} else {
 		sbi->root_nid = le16_to_cpu(dsb->rb.rootnid_2b);
 	}
-- 
2.43.5