linux-kernel - Re: [PATCH] f2fs: fix error path of __f2fs_build_free

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Date:   Mon, 16 Oct 2023 17:16:18 +0800
From:   Zhiguo Niu <niuzhiguo84@...il.com>
To:     Chao Yu <chao@...nel.org>
Cc:     Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: fix error path of __f2fs_build_free_nids

Dear Chao,

On Mon, Oct 16, 2023 at 5:07 PM Chao Yu <chao@...nel.org> wrote:
>
> Zhiguo,
>
> On 2023/10/16 17:02, Zhiguo Niu wrote:
> > Dear Chao,
> >
> > On Mon, Oct 16, 2023 at 3:37 PM Chao Yu <chao@...nel.org> wrote:
> >>
> >> On 2023/10/13 18:58, Zhiguo Niu wrote:
> >>> SBI_NEED_FSCK should be set for fsck has a chance to
> >>> repair in case of scan_nat_page fail in run time.
> >>>
> >>> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> >>
> >> Hi Zhiguo,
> >>
> >> Can you please check below update?
> >>
> >>   From 9a3459d2d62a12f8708d72aa7808a1def9f9d92f Mon Sep 17 00:00:00 2001
> >> From: Zhiguo Niu <zhiguo.niu@...soc.com>
> >> Date: Fri, 13 Oct 2023 18:58:23 +0800
> >> Subject: [PATCH] f2fs: fix error path of __f2fs_build_free_nids
> >>
> >> If NAT is corrupted, let scan_nat_page() return EFSCORRUPTED, so that,
> >> caller can set SBI_NEED_FSCK flag into checkpoint for later repair by
> >> fsck.
> >>
> >> Also, this patch introduces a new fscorrupted error flag, and in above
> >> scenario, it will persist the error flag into superblock synchronously
> >> to avoid it has no luck to trigger a checkpoint to record SBI_NEED_FSCK.
> >>
> >> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> >> Signed-off-by: Chao Yu <chao@...nel.org>
> >> ---
> >>    fs/f2fs/node.c          | 11 +++++++++--
> >>    include/linux/f2fs_fs.h |  1 +
> >>    2 files changed, 10 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> >> index a2b2c6c7f66d..57d9dd3a43bc 100644
> >> --- a/fs/f2fs/node.c
> >> +++ b/fs/f2fs/node.c
> >> @@ -2389,7 +2389,7 @@ static int scan_nat_page(struct f2fs_sb_info *sbi,
> >>                  blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
> >>
> >>                  if (blk_addr == NEW_ADDR)
> >> -                       return -EINVAL;
> >> +                       return -EFSCORRUPTED;
> >>
> >>                  if (blk_addr == NULL_ADDR) {
> >>                          add_free_nid(sbi, start_nid, true, true);
> >> @@ -2504,7 +2504,14 @@ static int __f2fs_build_free_nids(struct f2fs_sb_info *sbi,
> >>
> >>                          if (ret) {
> >>                                  f2fs_up_read(&nm_i->nat_tree_lock);
> >> -                               f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
> >> +
> >> +                               if (ret == -EFSCORRUPTED) {
> >> +                                       f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
> >> +                                       set_sbi_flag(sbi, SBI_NEED_FSCK);
> >> +                                       f2fs_handle_error(sbi,
> >> +                                                       ERROR_INCONSISTENT_NAT);
> >> +                               }
> >> +
> >>                                  return ret;
> >>                          }
> >>                  }
> >> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> >> index 07ed69c2840d..039fe0ce8d83 100644
> >> --- a/include/linux/f2fs_fs.h
> >> +++ b/include/linux/f2fs_fs.h
> >> @@ -104,6 +104,7 @@ enum f2fs_error {
> >>          ERROR_CORRUPTED_VERITY_XATTR,
> >>          ERROR_CORRUPTED_XATTR,
> >>          ERROR_INVALID_NODE_REFERENCE,
> >> +       ERROR_INCONSISTENT_NAT,
> >>          ERROR_MAX,
> >>    };
> >>
> >> --
> >> 2.40.1
> >
> > Thank you for your updates and these updates are more reasonable based
> > on the latest code.
> > In addition,  I also modified the following code after I checked the
> > related flow of f2fs_handle_error.
> > ERROR_INCONSISTENT_FOOTER is reused here,   any suggestions for this?
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index d9e6087..94f5c7f 100644
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1467,6 +1467,7 @@ static struct page *__get_node_page(struct
> > f2fs_sb_info *sbi, pgoff_t nid,
> >                            ofs_of_node(page), cpver_of_node(page),
> >                            next_blkaddr_of_node(page));
> >          set_sbi_flag(sbi, SBI_NEED_FSCK);
> > +       f2fs_handle_error(sbi, ERROR_INCONSISTENT_FOOTER);
> >          err = -EINVAL;
>
> err = -EFSCORRUPTED;
>
> >   out_err:
> >          ClearPageUptodate(page);
> >
> > If you have no other suggestions, I will update the "PATCH V2"
>
> How about changing above code in separated patch?
OK, I will do this as your suggestions.
Thanks!
>
> Thanks,
>
>  > Thanks!