linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix a redundant call to f2fs_balance

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Date:   Fri, 5 Mar 2021 09:19:47 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Colin King <colin.king@...onical.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
CC:     <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix a redundant call to f2fs_balance_fs
 if an error occurs

On 2021/3/4 17:21, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The  uninitialized variable dn.node_changed does not get set when a
> call to f2fs_get_node_page fails.  This uninitialized value gets used
> in the call to f2fs_balance_fs() that may or not may not balances
> dirty node and dentry pages depending on the uninitialized state of
> the variable. Fix this by only calling f2fs_balance_fs if err is
> not set.
> 
> Thanks to Jaegeuk Kim for suggesting an appropriate fix.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 2a3407607028 ("f2fs: call f2fs_balance_fs only when node was changed")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,