linux-ext4 - Re: [RFC -v2 5/8] ext4: Do not fail journal due to block allocator

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Message-ID: <20150818105545.GH5033@dhcp22.suse.cz>
Date:	Tue, 18 Aug 2015 12:55:46 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Dave Chinner <david@...morbit.com>,
	Theodore Ts'o <tytso@....edu>, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [RFC -v2 5/8] ext4: Do not fail journal due to block allocator

On Tue 18-08-15 12:39:03, Michal Hocko wrote:
[...]
> @@ -992,9 +992,8 @@ static int ext4_mb_get_buddy_page_lock(struct super_block *sb,
>  	block = group * 2;
>  	pnum = block / blocks_per_page;
>  	poff = block % blocks_per_page;
> -	page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
> -	if (!page)
> -		return -ENOMEM;
> +	page = find_or_create_page(inode->i_mapping, pnum,
> +				   GFP_NOFS|__GFP_NOFAIL);

Scratch this one. find_or_create_page is allowed to return NULL. The
patch is bogus. I was overly eager to turn all places to not check the
return value.

-- 
Michal Hocko
SUSE Labs
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