[PATCH 1/2] erofs-utils: lib: get rid of a redundent compress round

[Gao Xiang]

No need another round if no remaining data.
It can improve compression ratios a bit for specific data.

Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
 lib/compress.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/lib/compress.c b/lib/compress.c
index ee09950..7db666a 100644
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -584,16 +584,11 @@ int erofs_write_compressed_file(struct erofs_inode *inode)
 		remaining -= readcount;
 		ctx.tail += readcount;
 
-		/* do one compress round */
-		ret = vle_compress_one(inode, &ctx, false);
+		ret = vle_compress_one(inode, &ctx, !remaining);
 		if (ret)
-			goto err_bdrop;
+			goto err_free_idata;
 	}
-
-	/* do the final round */
-	ret = vle_compress_one(inode, &ctx, true);
-	if (ret)
-		goto err_free_idata;
+	DBG_BUGON(ctx.head != ctx.tail);
 
 	/* fall back to no compression mode */
 	compressed_blocks = ctx.blkaddr - blkaddr;
-- 
2.24.4