linux-kernel - [PATCH 2/3] erofs: get rid of label `restart

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Message-Id: <20220529055425.226363-3-xiang@kernel.org>
Date:   Sun, 29 May 2022 13:54:24 +0800
From:   Gao Xiang <xiang@...nel.org>
To:     linux-erofs@...ts.ozlabs.org, Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: [PATCH 2/3] erofs: get rid of label `restart_now'

From: Gao Xiang <hsiangkao@...ux.alibaba.com>

Simplify this part of code. No logic changes.

Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/zdata.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 4fd66a66c5f9..6dd858f94e44 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -643,28 +643,23 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
 repeat:
 	cur = end - 1;
 
-	/* lucky, within the range of the current map_blocks */
-	if (offset + cur >= map->m_la &&
-	    offset + cur < map->m_la + map->m_llen) {
+	if (offset + cur < map->m_la ||
+	    offset + cur >= map->m_la + map->m_llen) {
+		erofs_dbg("out-of-range map @ pos %llu", offset + cur);
+
+		if (z_erofs_collector_end(fe))
+			fe->backmost = false;
+		map->m_la = offset + cur;
+		map->m_llen = 0;
+		err = z_erofs_map_blocks_iter(inode, map, 0);
+		if (err)
+			goto err_out;
+	} else {
+		if (fe->pcl)
+			goto hitted;
 		/* didn't get a valid pcluster previously (very rare) */
-		if (!fe->pcl)
-			goto restart_now;
-		goto hitted;
 	}
 
-	/* go ahead the next map_blocks */
-	erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur);
-
-	if (z_erofs_collector_end(fe))
-		fe->backmost = false;
-
-	map->m_la = offset + cur;
-	map->m_llen = 0;
-	err = z_erofs_map_blocks_iter(inode, map, 0);
-	if (err)
-		goto err_out;
-
-restart_now:
 	if (!(map->m_flags & EROFS_MAP_MAPPED))
 		goto hitted;
 
-- 
2.30.2