z_erofs_pcluster_begin(): don't bother with rounding position down

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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240425200017.GF1031757@ZenIV
[ Gao Xiang: don't use `offset_in_page(mptr)` due to EROFS_NO_KMAP. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index d417e189f1a0d42eed09040d69f29f0aed6a71a3..d6fe002a4a7194760d76ac06ca0d5ca0c540efaf 100644 (file)
--- 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);