linux-kernel - [PATCH AUTOSEL 6.6 13/19] erofs: fix ztailpacking for subpage compressed blocks

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Message-ID: <20240116002413.215163-13-sashal@kernel.org>
Date: Mon, 15 Jan 2024 19:23:48 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Gao Xiang <hsiangkao@...ux.alibaba.com>,
	Chao Yu <chao@...nel.org>,
	Yue Hu <huyue2@...lpad.com>,
	Sasha Levin <sashal@...nel.org>,
	xiang@...nel.org,
	linux-erofs@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 6.6 13/19] erofs: fix ztailpacking for subpage compressed blocks

From: Gao Xiang <hsiangkao@...ux.alibaba.com>

[ Upstream commit e5aba911dee5e20fa82efbe13e0af8f38ea459e7 ]

`pageofs_in` should be the compressed data offset of the page rather
than of the block.

Acked-by: Chao Yu <chao@...nel.org>
Reviewed-by: Yue Hu <huyue2@...lpad.com>
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Link: https://lore.kernel.org/r/20231214161337.753049-1-hsiangkao@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/erofs/zdata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index a7e6847f6f8f..c9ae96467d98 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -815,7 +815,6 @@ static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe)
 
 	if (ztailpacking) {
 		pcl->obj.index = 0;	/* which indicates ztailpacking */
-		pcl->pageofs_in = erofs_blkoff(fe->inode->i_sb, map->m_pa);
 		pcl->tailpacking_size = map->m_plen;
 	} else {
 		pcl->obj.index = map->m_pa >> PAGE_SHIFT;
@@ -893,6 +892,7 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe)
 		}
 		get_page(map->buf.page);
 		WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, map->buf.page);
+		fe->pcl->pageofs_in = map->m_pa & ~PAGE_MASK;
 		fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
 	}
 	/* file-backed inplace I/O pages are traversed in reverse order */
-- 
2.43.0