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SubjectRe: [PATCH 2/3] vfs: Add a super block operation to check for writeback errors
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On Mon, 2020-12-21 at 14:50 -0500, Vivek Goyal wrote:
> Right now we check for errors on super block in syncfs().
>
> ret2 = errseq_check_and_advance(&sb->s_wb_err, &f.file->f_sb_err);
>
> overlayfs does not update sb->s_wb_err and it is tracked on upper filesystem.
> So provide a superblock operation to check errors so that filesystem
> can provide override generic method and provide its own method to
> check for writeback errors.
>
> Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
> ---
>  fs/sync.c | 5 ++++-
>  include/linux/fs.h | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/fs/sync.c b/fs/sync.c
> index b5fb83a734cd..57e43a16dfca 100644
> --- a/fs/sync.c
> +++ b/fs/sync.c
> @@ -176,7 +176,10 @@ SYSCALL_DEFINE1(syncfs, int, fd)
>   ret = sync_filesystem(sb);
>   up_read(&sb->s_umount);
>  
>
> - ret2 = errseq_check_and_advance(&sb->s_wb_err, &f.file->f_sb_err);
> + if (sb->s_op->errseq_check_advance)
> + ret2 = sb->s_op->errseq_check_advance(sb, f.file);
> + else
> + ret2 = errseq_check_and_advance(&sb->s_wb_err, &f.file->f_sb_err);
>  
>
>   fdput(f);
>   return ret ? ret : ret2;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 8667d0cdc71e..4297b6127adf 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1965,6 +1965,7 @@ struct super_operations {
>   struct shrink_control *);
>   long (*free_cached_objects)(struct super_block *,
>   struct shrink_control *);
> + int (*errseq_check_advance)(struct super_block *, struct file *);
>  };
>  
>
>  /*

Also, the other super_operations generally don't take a superblock
pointer when you pass in a different fs object pointer. This should
probably just take a struct file * and then the operation can chase
pointers to the superblock from there.

--
Jeff Layton <jlayton@kernel.org>

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