[PATCH] erofs: fix wrong address in erofs_get_block

[Huang Jianan]

iblock indicates the number of i_blkbits-sized blocks rather than
sectors, fix it.

If the data has a disk mapping, map_bh should be used to read the
correct data from the device.

Fixes: 9da681e017a3 ("staging: erofs: support bmap")
Signed-off-by: Huang Jianan <huangjianan at oppo.com>
Signed-off-by: Guo Weichao <guoweichao at oppo.com>
---
 fs/erofs/data.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 347be146884c..1415fee10180 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -316,7 +316,7 @@ static int erofs_get_block(struct inode *inode, sector_t iblock,
 			   struct buffer_head *bh, int create)
 {
 	struct erofs_map_blocks map = {
-		.m_la = iblock << 9,
+		.m_la = iblock << blknr_to_addr(iblock),
 	};
 	int err;
 
@@ -325,7 +325,7 @@ static int erofs_get_block(struct inode *inode, sector_t iblock,
 		return err;
 
 	if (map.m_flags & EROFS_MAP_MAPPED)
-		bh->b_blocknr = erofs_blknr(map.m_pa);
+		map_bh(bh, inode->i_sb, erofs_blknr(map.m_pa));
 
 	return err;
 }
-- 
2.25.1