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From: Jan Kara <jack@suse.cz>
To: Zhang Yi <yi.zhang@huawei.com>
Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz,
	yukuai3@huawei.com
Subject: Re: [RFC PATCH v2 3/7] jbd2: don't abort the journal when freeing buffers
Date: Wed, 21 Apr 2021 15:23:54 +0200
Message-ID: <20210421132354.GS8706@quack2.suse.cz> (raw)
In-Reply-To: <20210414134737.2366971-4-yi.zhang@huawei.com>

On Wed 14-04-21 21:47:33, Zhang Yi wrote:
> Now, we can make sure to abort the journal once the original buffer was
  ^^ Now that we can be sure the journal is aborted once a buffer has
failed to be written back to disk, ...

> failed to write back to disk, we can remove the journal abort logic in
> jbd2_journal_try_to_free_buffers() which was introduced in
> <c044f3d8360d> ("jbd2: abort journal if free a async write error
> metadata buffer"), because it may costs and propably not safe.
				    ^^ cost	^^ probably is

> Signed-off-by: Zhang Yi <yi.zhang@huawei.com>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/jbd2/transaction.c | 17 -----------------
>  1 file changed, 17 deletions(-)
> 
> diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
> index 9396666b7314..3e0db4953fe4 100644
> --- a/fs/jbd2/transaction.c
> +++ b/fs/jbd2/transaction.c
> @@ -2118,7 +2118,6 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
>  {
>  	struct buffer_head *head;
>  	struct buffer_head *bh;
> -	bool has_write_io_error = false;
>  	int ret = 0;
>  
>  	J_ASSERT(PageLocked(page));
> @@ -2143,26 +2142,10 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
>  		jbd2_journal_put_journal_head(jh);
>  		if (buffer_jbd(bh))
>  			goto busy;
> -
> -		/*
> -		 * If we free a metadata buffer which has been failed to
> -		 * write out, the jbd2 checkpoint procedure will not detect
> -		 * this failure and may lead to filesystem inconsistency
> -		 * after cleanup journal tail.
> -		 */
> -		if (buffer_write_io_error(bh)) {
> -			pr_err("JBD2: Error while async write back metadata bh %llu.",
> -			       (unsigned long long)bh->b_blocknr);
> -			has_write_io_error = true;
> -		}
>  	} while ((bh = bh->b_this_page) != head);
>  
>  	ret = try_to_free_buffers(page);
> -
>  busy:
> -	if (has_write_io_error)
> -		jbd2_journal_abort(journal, -EIO);
> -
>  	return ret;
>  }
>  
> -- 
> 2.25.4
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14 13:47 [RFC PATCH v2 0/7] ext4, jbd2: fix 3 issues about bdev_try_to_free_page() Zhang Yi
2021-04-14 13:47 ` [RFC PATCH v2 1/7] jbd2: remove the out label in __jbd2_journal_remove_checkpoint() Zhang Yi
2021-04-21 10:01   ` Jan Kara
2021-04-14 13:47 ` [RFC PATCH v2 2/7] jbd2: ensure abort the journal if detect IO error when writing original buffer back Zhang Yi
2021-04-21 13:20   ` Jan Kara
2021-04-14 13:47 ` [RFC PATCH v2 3/7] jbd2: don't abort the journal when freeing buffers Zhang Yi
2021-04-21 13:23   ` Jan Kara [this message]
2021-04-14 13:47 ` [RFC PATCH v2 4/7] jbd2: do not free buffers in jbd2_journal_try_to_free_buffers() Zhang Yi
2021-04-15 14:46   ` Christoph Hellwig
2021-04-14 13:47 ` [RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in blkdev_releasepage() Zhang Yi
2021-04-15 14:48   ` Christoph Hellwig
2021-04-14 13:47 ` [RFC PATCH v2 6/7] fs: introduce a usage count into the superblock Zhang Yi
2021-04-15 14:40   ` Christoph Hellwig
2021-04-16  8:00     ` Zhang Yi
2021-04-14 13:47 ` [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() Zhang Yi
2021-04-15 14:52   ` Christoph Hellwig
2021-04-16  8:00     ` Zhang Yi
2021-04-20 13:08       ` Christoph Hellwig
2021-04-21 13:46         ` Jan Kara
2021-04-21 16:57           ` Theodore Ts'o
2021-04-22  9:04             ` Jan Kara
2021-04-23 11:39               ` Zhang Yi
2021-04-23 16:06                 ` Jan Kara
2021-04-23 14:40               ` Theodore Ts'o

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