linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: prevent newly created inode from being dirtied incorrectly

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Date:   Thu, 11 Jan 2018 17:52:38 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Daeho Jeong <daeho.jeong@...sung.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: prevent newly created inode from being
 dirtied incorrectly

On 2018/1/11 10:26, Daeho Jeong wrote:
> Now, we invoke f2fs_mark_inode_dirty_sync() to make an inode dirty in
> advance of creating a new node page for the inode. By this, some inodes
> whose node page is not created yet can be linked into the global dirty
> list.
> 
> If the checkpoint is executed at this moment, the inode will be written
> back by writeback_single_inode() and finally update_inode_page() will
> fail to detach the inode from the global dirty list because the inode
> doesn't have a node page.
> 
> The problem is that the inode's state in VFS layer will become clean
> after execution of writeback_single_inode() and it's still linked in
> the global dirty list of f2fs and this will cause a kernel panic.
> 
> So, we will prevent the newly created inode from being dirtied during
> the FI_NEW_INODE flag of the inode is set. We will make it dirty
> right after the flag is cleared.
> 
> Signed-off-by: Daeho Jeong <daeho.jeong@...sung.com>
> Signed-off-by: Youngjin Gil <youngjin.gil@...sung.com>
> Tested-by: Hobin Woo <hobin.woo@...sung.com>

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

Thanks,