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>
This commit is contained in:
Al Viro 2024-04-25 21:00:17 +01:00 • committed by Gao Xiang
commit 5587a8172e