[PATCH 6/6] z_erofs_pcluster_begin(): don't bother with rounding position down

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... and be more idiomatic when calculating ->pageofs_in.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 fs/erofs/zdata.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index d417e189f1a0..a4ff20b54cc1 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -868,7 +868,7 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe)
 	} else {
 		void *mptr;
 
-		mptr = erofs_read_metabuf(&map->buf, sb, erofs_pos(sb, blknr), EROFS_NO_KMAP);
+		mptr = erofs_read_metabuf(&map->buf, sb, map->m_pa, EROFS_NO_KMAP);
 		if (IS_ERR(mptr)) {
 			ret = PTR_ERR(mptr);
 			erofs_err(sb, "failed to get inline data %d", ret);
@@ -876,7 +876,7 @@ 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->pcl->pageofs_in = offset_in_page(mptr);
 		fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
 	}
 	/* file-backed inplace I/O pages are traversed in reverse order */
-- 
2.39.2





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