From: Jan Kara <jack@suse.cz>
To: Zhang Yi <yi.zhang@huawei.com>
Cc: 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, 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,
chengzhihao1@huawei.com, yukuai3@huawei.com
Subject: Re: [PATCH 08/14] ocfs2: replace ll_rw_block()
Date: Wed, 31 Aug 2022 13:31:34 +0200 [thread overview]
Message-ID: <20220831113134.fdmklqore4uglz7g@quack3> (raw)
In-Reply-To: <20220831072111.3569680-9-yi.zhang@huawei.com>
On Wed 31-08-22 15:21:05, Zhang Yi 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.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;
I would just use bh_read() here and drop bh_read_locked() altogether...
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2022-08-31 11:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 7:20 [PATCH 00/14] buffer: remove ll_rw_block() Zhang Yi
2022-08-31 7:20 ` [PATCH 01/14] fs/buffer: remove __breadahead_gfp() Zhang Yi
2022-08-31 10:39 ` Jan Kara
2022-08-31 7:20 ` [PATCH 02/14] fs/buffer: add some new buffer read helpers Zhang Yi
2022-08-31 11:30 ` Jan Kara
2022-08-31 13:11 ` Zhang Yi
2022-08-31 7:21 ` [PATCH 03/14] fs/buffer: replace ll_rw_block() Zhang Yi
2022-08-31 10:51 ` Jan Kara
2022-08-31 7:21 ` [PATCH 04/14] gfs2: " Zhang Yi
2022-08-31 10:52 ` Jan Kara
2022-08-31 7:21 ` [PATCH 05/14] isofs: " Zhang Yi
2022-08-31 10:53 ` Jan Kara
2022-08-31 7:21 ` [PATCH 06/14] jbd2: " Zhang Yi
2022-08-31 10:58 ` Jan Kara
2022-08-31 7:21 ` [PATCH 07/14] ntfs3: " Zhang Yi
2022-08-31 10:59 ` Jan Kara
2022-08-31 7:21 ` [PATCH 08/14] ocfs2: " Zhang Yi
2022-08-31 11:31 ` Jan Kara [this message]
2022-08-31 7:21 ` [PATCH 09/14] reiserfs: " Zhang Yi
2022-08-31 11:04 ` Jan Kara
2022-08-31 7:21 ` [PATCH 10/14] udf: " Zhang Yi
2022-08-31 11:05 ` Jan Kara
2022-08-31 7:21 ` [PATCH 11/14] ufs: " Zhang Yi
2022-08-31 11:06 ` Jan Kara
2022-08-31 7:21 ` [PATCH 12/14] fs/buffer: remove ll_rw_block() helper Zhang Yi
2022-08-31 11:06 ` Jan Kara
2022-08-31 7:21 ` [PATCH 13/14] ext2: replace bh_submit_read() helper with bh_read_locked() Zhang Yi
2022-08-31 11:15 ` Jan Kara
2022-08-31 7:21 ` [PATCH 14/14] fs/buffer: remove bh_submit_read() helper Zhang Yi
2022-08-31 11:16 ` Jan Kara
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