From: Zhan Xusheng <zhanxusheng@xiaomi.com>
Date: Mon, 22 Jun 2026 08:11:36 +0000 (+0800)
Subject: erofs: handle 48-bit blocks_hi for compressed inodes
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=803d09a554055aba160a62abd1e4b1260b899dc1;p=thirdparty%2Flinux.git

erofs: handle 48-bit blocks_hi for compressed inodes

Combine i_nb.blocks_hi with i_u.blocks_lo when computing
inode->i_blocks for compressed inodes, mirroring the startblk_hi
handling for unencoded inodes a few lines above.  Also evaluate
the shift in u64 to avoid truncation.

Fixes: efb2aef569b3 ("erofs: add encoded extent on-disk definition")
Fixes: 1d191b4ca51d ("erofs: implement encoded extent metadata")
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 1df38b7c82a71..45afe5c50de83 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -191,8 +191,9 @@ static int erofs_read_inode(struct inode *inode)
 		err = -EFSCORRUPTED;
 		goto err_out;
 	} else {
-		inode->i_blocks = le32_to_cpu(copied.i_u.blocks_lo) <<
-				(sb->s_blocksize_bits - 9);
+		inode->i_blocks = (le32_to_cpu(copied.i_u.blocks_lo) |
+			((u64)le16_to_cpu(copied.i_nb.blocks_hi) << 32)) <<
+				  (sb->s_blocksize_bits - 9);
 	}
 
 	if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {