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From:   Zhang Yi <yi.zhang@huawei.com>
To:     <linux-ext4@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <cluster-devel@redhat.com>,
        <ntfs3@lists.linux.dev>, <ocfs2-devel@oss.oracle.com>,
        <reiserfs-devel@vger.kernel.org>
CC:     <jack@suse.cz>, <tytso@mit.edu>, <akpm@linux-foundation.org>,
        <axboe@kernel.dk>, <viro@zeniv.linux.org.uk>,
        <rpeterso@redhat.com>, <agruenba@redhat.com>,
        <almaz.alexandrovich@paragon-software.com>, <mark@fasheh.com>,
        <dushistov@mail.ru>, <hch@infradead.org>, <yi.zhang@huawei.com>,
        <chengzhihao1@huawei.com>, <yukuai3@huawei.com>
Subject: [PATCH 08/14] ocfs2: replace ll_rw_block()
Date:   Wed, 31 Aug 2022 15:21:05 +0800
Message-ID: <20220831072111.3569680-9-yi.zhang@huawei.com>
In-Reply-To: <20220831072111.3569680-1-yi.zhang@huawei.com>
References: <20220831072111.3569680-1-yi.zhang@huawei.com>
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ll_rw_block() is not safe for the sync read path because it cannot
guarantee that submitting read IO if the buffer has been locked. We
could get false positive EIO after wait_on_buffer() if the buffer has
been locked by others. So stop using ll_rw_block() in ocfs2.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ocfs2/aops.c  | 2 +-
 fs/ocfs2/super.c | 5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index af4157f61927..1d65f6ef00ca 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -636,7 +636,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
 			   !buffer_new(bh) &&
 			   ocfs2_should_read_blk(inode, page, block_start) &&
 			   (block_start < from || block_end > to)) {
-			ll_rw_block(REQ_OP_READ, 1, &bh);
+			bh_read_nowait(bh, 0);
 			*wait_bh++=bh;
 		}
 
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index e2cc9eec287c..4050f35bbd0c 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1763,10 +1763,7 @@ static int ocfs2_get_sector(struct super_block *sb,
 	lock_buffer(*bh);
 	if (!buffer_dirty(*bh))
 		clear_buffer_uptodate(*bh);
-	unlock_buffer(*bh);
-	ll_rw_block(REQ_OP_READ, 1, bh);
-	wait_on_buffer(*bh);
-	if (!buffer_uptodate(*bh)) {
+	if (bh_read_locked(*bh, 0)) {
 		mlog_errno(-EIO);
 		brelse(*bh);
 		*bh = NULL;
-- 
2.31.1