On 03/08, Chao Yu wrote:
> 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?
I've checked them. is_checkpointed_data() has nothing to do with this warm node
and this prevents add_discard_addrs to issue discard command.
Thanks,
>
> Thanks,
>
> >
> > Fixes: 5b6c6be2d878 ("f2fs: use SSR for warm node as well")
> > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> > ---
> > 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
> >
