On 2017/3/7 5:51, Jaegeuk Kim wrote:
> This patch fixes that SSR can overwrite previous warm node block consisting of
> a node chain since the last checkpoint.
Good catch!
Need to consider the impact to other accesser, e.g. is_checkpointed_data,
add_discard_addrs?
Thanks,
>
> Fixes: 5b6c6be2d878 ("f2fs: use SSR for warm node as well")
> Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
> ---
> fs/f2fs/segment.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 2ae36d04d03e..684b869e1861 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1177,6 +1177,12 @@ static void update_sit_entry(struct f2fs_sb_info *sbi,
> block_t blkaddr, int del)
> if (f2fs_discard_en(sbi) &&
> !f2fs_test_and_set_bit(offset, se->discard_map))
> sbi->discard_blks--;
> +
> + /* don't overwrite by SSR to keep node chain */
> + if (se->type == CURSEG_WARM_NODE) {
> + if (!f2fs_test_and_set_bit(offset, se->ckpt_valid_map))
> + se->ckpt_valid_blocks++;
> + }
> } else {
> if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map)) {
> #ifdef CONFIG_F2FS_CHECK_FS
>
