linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: retry to update the inode page given EIO

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Date:   Thu, 12 Jan 2023 16:01:20 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, stable@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: retry to update the inode page given
 EIO

On 01/12, Chao Yu wrote:
> On 2023/1/12 2:50, Jaegeuk Kim wrote:
> > On 01/11, Chao Yu wrote:
> > > On 2023/1/11 9:20, Jaegeuk Kim wrote:
> > > > In f2fs_update_inode_page, f2fs_get_node_page handles EIO along with
> > > > f2fs_handle_page_eio that stops checkpoint, if the disk couldn't be recovered.
> > > > As a result, we don't need to stop checkpoint right away given single EIO.
> > > 
> > > f2fs_handle_page_eio() only covers the case that EIO occurs on the same
> > > page, should we cover the case EIO occurs on different pages?
> > 
> > Which case are you looking at?
> 
> - __get_node_page(PageA)		- __get_node_page(PageB)
>  - f2fs_handle_page_eio
>   - sbi->page_eio_ofs[type] = PageA->index
> 					 - f2fs_handle_page_eio
> 					  - sbi->page_eio_ofs[type] = PageB->index
> 
> In such race case, it may has low probability to set CP_ERROR_FLAG as we expect?

Do you see that case in products?
I'm trying to avoid setting CP_ERROR_FLAG here.

> 
> Thanks,
> 
> > 
> > > 
> > > Thanks,
> > > 
> > > > 
> > > > Cc: stable@...r.kernel.org
> > > > Signed-off-by: Randall Huang <huangrandall@...gle.com>
> > > > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > > > ---
> > > > 
> > > >    Change log from v1:
> > > >     - fix a bug
> > > > 
> > > >    fs/f2fs/inode.c | 2 +-
> > > >    1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> > > > index ff6cf66ed46b..2ed7a621fdf1 100644
> > > > --- a/fs/f2fs/inode.c
> > > > +++ b/fs/f2fs/inode.c
> > > > @@ -719,7 +719,7 @@ void f2fs_update_inode_page(struct inode *inode)
> > > >    	if (IS_ERR(node_page)) {
> > > >    		int err = PTR_ERR(node_page);
> > > > -		if (err == -ENOMEM) {
> > > > +		if (err == -ENOMEM || (err == -EIO && !f2fs_cp_error(sbi))) {
> > > >    			cond_resched();
> > > >    			goto retry;
> > > >    		} else if (err != -ENOENT) {