[PATCH] erofs: remove dead codes for cleanup

[Chao Yu]

z_erofs_extent_lookback() and z_erofs_get_extent_decompressedlen() tries
to do sanity check on m->type, however their caller z_erofs_map_blocks_fo()
has already checked that, so let's remove those dead codes.

Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
 fs/erofs/zmap.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index 8de50df05dfe..4d883ec212d7 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -265,17 +265,12 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
 		if (err)
 			return err;

-		if (m->type >= Z_EROFS_LCLUSTER_TYPE_MAX) {
-			erofs_err(sb, "unknown type %u @ lcn %lu of nid %llu",
-				  m->type, lcn, vi->nid);
-			DBG_BUGON(1);
-			return -EOPNOTSUPP;
-		} else if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
+		if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
 			lookback_distance = m->delta[0];
 			if (!lookback_distance)
 				break;
 			continue;
-		} else {
+		} else if (m->type < Z_EROFS_LCLUSTER_TYPE_MAX) {
 			m->headtype = m->type;
 			m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
 			return 0;
@@ -379,11 +374,6 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
 			if (lcn != headlcn)
 				break;	/* ends at the next HEAD lcluster */
 			m->delta[1] = 1;
-		} else {
-			erofs_err(inode->i_sb, "unknown type %u @ lcn %llu of nid %llu",
-				  m->type, lcn, vi->nid);
-			DBG_BUGON(1);
-			return -EOPNOTSUPP;
 		}
 		lcn += m->delta[1];
 	}
-- 
2.48.1

> 
> Thanks,
> Gao Xiang
>