On 9/1/22 9:34 PM, Zhang Yi via Ocfs2-devel wrote:
> 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.zh...@huawei.com>

Looks good to me.
Reviewed-by: Joseph Qi <joseph...@linux.alibaba.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;

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