[PATCH v2 08/14] ocfs2: replace ll_rw_block()

Zhang Yi
2022-09-01T13:24:58Z

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 | 4 +---
2 files changed, 2 insertions(+), 4 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..26b4c2bfee49 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1764,9 +1764,7 @@ static int ocfs2_get_sector(struct super_block *sb,
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(*bh, 0) < 0) {
mlog_errno(-EIO);
brelse(*bh);
*bh = NULL;
--
2.31.1