Re: [f2fs-dev] [PATCH 2/3 v2] f2fs: clear writeback when compression failed

[Daeho Jeong]

On Tue, Apr 16, 2024 at 9:50 AM Jaegeuk Kim <jaegeuk@xxxxxxxxxx> wrote:
>
> Let's stop issuing compressed writes and clear their writeback flags.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> ---
>
>  Now, I don't see any kernel hang for 24hours.
>
>  Change log from v1:
>   - fix bugs
>
>  fs/f2fs/compress.c | 40 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 38 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index d67c471ab5df..b12d3a49bfda 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -1031,6 +1031,31 @@ static void set_cluster_writeback(struct compress_ctx *cc)
>         }
>  }
>
> +static void cancel_cluster_writeback(struct compress_ctx *cc,
> +                       struct compress_io_ctx *cic, int submitted)
> +{
> +       int i;
> +
> +       /* Wait for submitted IOs. */
> +       if (submitted > 1) {
> +               f2fs_submit_merged_write(F2FS_I_SB(cc->inode), DATA);
> +               while (atomic_read(&cic->pending_pages) !=
> +                                       (cc->valid_nr_cpages - submitted + 1))
> +                       f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
> +       }
> +
> +       /* Cancel writeback and stay locked. */
> +       for (i = 0; i < cc->cluster_size; i++) {
> +               if (i < submitted) {
> +                       inode_inc_dirty_pages(cc->inode);
> +                       lock_page(cc->rpages[i]);
> +               }
> +               clear_page_private_gcing(cc->rpages[i]);
> +               if (folio_test_writeback(page_folio(cc->rpages[i])))
> +                       end_page_writeback(cc->rpages[i]);
> +       }
> +}
> +
>  static void set_cluster_dirty(struct compress_ctx *cc)
>  {
>         int i;
> @@ -1232,7 +1257,6 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
>                 .page = NULL,
>                 .encrypted_page = NULL,
>                 .compressed_page = NULL,
> -               .submitted = 0,
>                 .io_type = io_type,
>                 .io_wbc = wbc,
>                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode) ?
> @@ -1358,7 +1382,16 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
>                         fio.compressed_page = cc->cpages[i - 1];
>
>                 cc->cpages[i - 1] = NULL;
> +               fio.submitted = 0;
>                 f2fs_outplace_write_data(&dn, &fio);
> +               if (unlikely(!fio.submitted)) {
> +                       cancel_cluster_writeback(cc, cic, i);
> +
> +                       /* To call fscrypt_finalize_bounce_page */
> +                       i = cc->valid_nr_cpages;
> +                       *submitted = 0;
> +                       goto out_destroy_crypt;
> +               }
>                 (*submitted)++;
>  unlock_continue:
>                 inode_dec_dirty_pages(cc->inode);
> @@ -1392,8 +1425,11 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
>  out_destroy_crypt:
>         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
>
> -       for (--i; i >= 0; i--)
> +       for (--i; i >= 0; i--) {
> +               if (!cc->cpages[i])
> +                       continue;
>                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
> +       }
>  out_put_cic:
>         kmem_cache_free(cic_entry_slab, cic);
>  out_put_dnode:
> --
> 2.44.0.683.g7961c838ac-goog
>
>
>
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Reviewed-by: Daeho Jeong <daehojeong@xxxxxxxxxx>

Thanks,