Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jingbo Xu <jefflexu@linux.alibaba.com>
To:     xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com,
        linux-erofs@lists.ozlabs.org
Cc:     zhujia.zj@bytedance.com, yinxin.x@bytedance.com,
        linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] erofs: get correct count for unmapped range in fscache mode
Date:   Fri,  4 Nov 2022 13:40:28 +0800
Message-Id: <20221104054028.52208-3-jefflexu@linux.alibaba.com>
In-Reply-To: <20221104054028.52208-1-jefflexu@linux.alibaba.com>
References: <20221104054028.52208-1-jefflexu@linux.alibaba.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

For unmapped range, the returned map.m_llen is zero, and thus the
calculated count is unexpected zero.

Prior to the refactoring introduced by commit 1ae9470c3e14 ("erofs:
clean up .read_folio() and .readahead() in fscache mode"), only the
readahead routine suffers from this. With the refactoring of making
.read_folio() and .readahead() calling one common routine, both
read_folio and readahead have this issue now.

Fix this by calculating count separately in unmapped condition.

Fixes: c665b394b9e8 ("erofs: implement fscache-based data readahead")
Fixes: 1ae9470c3e14 ("erofs: clean up .read_folio() and .readahead() in fscache mode")
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/fscache.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 83559008bfa8..260fa4737fc0 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -296,15 +296,16 @@ static int erofs_fscache_data_read(struct address_space *mapping,
 		return PAGE_SIZE;
 	}
 
-	count = min_t(size_t, map.m_llen - (pos - map.m_la), len);
-	DBG_BUGON(!count || count % PAGE_SIZE);
-
 	if (!(map.m_flags & EROFS_MAP_MAPPED)) {
+		count = len;
 		iov_iter_xarray(&iter, READ, &mapping->i_pages, pos, count);
 		iov_iter_zero(count, &iter);
 		return count;
 	}
 
+	count = min_t(size_t, map.m_llen - (pos - map.m_la), len);
+	DBG_BUGON(!count || count % PAGE_SIZE);
+
 	mdev = (struct erofs_map_dev) {
 		.m_deviceid = map.m_deviceid,
 		.m_pa = map.m_pa,
-- 
2.19.1.6.gb485710b