linux-ext4 - Re: [PATCH v2 3/4] ext4: factor out write end code of inline file

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Message-ID: <20210715120818.GF9457@quack2.suse.cz>
Date:   Thu, 15 Jul 2021 14:08:18 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yukuai3@...wei.com
Subject: Re: [PATCH v2 3/4] ext4: factor out write end code of inline file

On Thu 15-07-21 09:54:51, Zhang Yi wrote:
> Now that the inline_data file write end procedure are falled into the
> common write end functions, it is not clear. Factor them out and do
> some cleanup. This patch also drop ext4_da_write_inline_data_end()
> and switch to use ext4_write_inline_data_end() instead because we also
> need to do the same error processing if we failed to write data into
> inline entry.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Just two small comments below.

> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
> index 28b666f25ac2..3d227b32b21c 100644
> --- a/fs/ext4/inline.c
> +++ b/fs/ext4/inline.c
...
> +out:
> +	/*
> +	 * If we have allocated more blocks and copied less. We will have
> +	 * blocks allocated outside inode->i_size, so truncate them.
> +	 */
> +	if (pos + len > inode->i_size && ext4_can_truncate(inode))
> +		ext4_orphan_add(handle, inode);

I don't think we need this error handling here. For inline data we never
allocate any blocks so shorter writes don't need any cleanup.

> -	return copied;
> +	ret2 = ext4_journal_stop(handle);
> +	if (!ret)
> +		ret = ret2;
> +	if (pos + len > inode->i_size) {
> +		ext4_truncate_failed_write(inode);
> +		/*
> +		 * If truncate failed early the inode might still be
> +		 * on the orphan list; we need to make sure the inode
> +		 * is removed from the orphan list in that case.
> +		 */
> +		if (inode->i_nlink)
> +			ext4_orphan_del(NULL, inode);
> +	}

And this can go away as well...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR