linux-ext4 - [PATCH 10/14] udf: replace ll_rw

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Date:   Wed, 31 Aug 2022 15:21:07 +0800
From:   Zhang Yi <yi.zhang@...wei.com>
To:     <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <cluster-devel@...hat.com>,
        <ntfs3@...ts.linux.dev>, <ocfs2-devel@....oracle.com>,
        <reiserfs-devel@...r.kernel.org>
CC:     <jack@...e.cz>, <tytso@....edu>, <akpm@...ux-foundation.org>,
        <axboe@...nel.dk>, <viro@...iv.linux.org.uk>,
        <rpeterso@...hat.com>, <agruenba@...hat.com>,
        <almaz.alexandrovich@...agon-software.com>, <mark@...heh.com>,
        <dushistov@...l.ru>, <hch@...radead.org>, <yi.zhang@...wei.com>,
        <chengzhihao1@...wei.com>, <yukuai3@...wei.com>
Subject: [PATCH 10/14] udf: replace ll_rw_block()

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(). We also switch to
new bh_readahead_batch() helper for the buffer array readahead path.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/udf/dir.c       | 2 +-
 fs/udf/directory.c | 2 +-
 fs/udf/inode.c     | 5 +----
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index cad3772f9dbe..15a98aa33aa8 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -130,7 +130,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(REQ_OP_READ | REQ_RAHEAD, num, bha);
+				bh_readahead_batch(bha, num, REQ_RAHEAD);
 				for (i = 0; i < num; i++)
 					brelse(bha[i]);
 			}
diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index a2adf6293093..469bc22d6bff 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -89,7 +89,7 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(REQ_OP_READ | REQ_RAHEAD, num, bha);
+				bh_readahead_batch(bha, num, REQ_RAHEAD);
 				for (i = 0; i < num; i++)
 					brelse(bha[i]);
 			}
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 8d06daed549f..0971f09d20fc 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1214,10 +1214,7 @@ struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
 	if (buffer_uptodate(bh))
 		return bh;
 
-	ll_rw_block(REQ_OP_READ, 1, &bh);
-
-	wait_on_buffer(bh);
-	if (buffer_uptodate(bh))
+	if (!bh_read(bh, 0))
 		return bh;
 
 	brelse(bh);
-- 
2.31.1