On 10/30, Chao Yu wrote:
> On 2017/10/30 9:33, Yunlong Song wrote:
> > This reverts commit 5e443818fa0b2a2845561ee25bec181424fb2889
> >
> > The commit should be reverted because call sequence of below two parts
> > of code must be kept:
> > a. update sit information, it needs to be updated before segment
> > allocation since latter allocation may trigger SSR, and SSR allocation
> > needs latest valid block information of all segments.
> > b. update segment status, it needs to be updated after segment allocation
> > since we can skip updating current opened segment status.
> >
> > Fixes: 5e443818fa0b ("f2fs: handle dirty segments inside refresh_sit_entry")
> > Suggested-by: Chao Yu <yuch...@huawei.com>
> > Signed-off-by: Yunlong Song <yunlong.s...@huawei.com>
>
> Reviewed-by: Chao Yu <yuch...@huawei.com>
>
> Thanks,
>
> > ---
> > fs/f2fs/f2fs.h | 1 -
> > fs/f2fs/segment.c | 20 +++++++++++++-------
> > 2 files changed, 13 insertions(+), 8 deletions(-)
> >
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 13a96b8..f166112 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -2567,7 +2567,6 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
> > bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr);
> > void init_discard_policy(struct discard_policy *dpolicy, int discard_type,
> > unsigned int granularity);
> > -void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new);
> > void stop_discard_thread(struct f2fs_sb_info *sbi);
> > bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
> > void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control
> > *cpc);
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index 46dfbca..a3509e9 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -1884,14 +1884,11 @@ static void update_sit_entry(struct f2fs_sb_info
> > *sbi, block_t blkaddr, int del)
> > get_sec_entry(sbi, segno)->valid_blocks += del;
> > }
> >
> > -void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new)
> > +static void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old,
> > block_t new)
IMO, we don't even need this function, and insteda, do update_sit_entry work
directly below. Merged with it, so let me know, if you have any concern.
Thanks,
> > {
> > update_sit_entry(sbi, new, 1);
> > if (GET_SEGNO(sbi, old) != NULL_SEGNO)
> > update_sit_entry(sbi, old, -1);
> > -
> > - locate_dirty_segment(sbi, GET_SEGNO(sbi, old));
> > - locate_dirty_segment(sbi, GET_SEGNO(sbi, new));
> > }
> >
> > void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
> > @@ -2529,13 +2526,22 @@ void allocate_data_block(struct f2fs_sb_info *sbi,
> > struct page *page,
> >
> > stat_inc_block_count(sbi, curseg);
> >
> > + /*
> > + * SIT information should be updated before segment allocation,
> > + * since SSR needs latest valid block information.
> > + */
> > + refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
> > +
> > if (!__has_curseg_space(sbi, type))
> > sit_i->s_ops->allocate_segment(sbi, type, false);
> > +
> > /*
> > - * SIT information should be updated after segment allocation,
> > - * since we need to keep dirty segments precisely under SSR.
> > + * segment dirty status should be updated after segment allocation,
> > + * so we just need to update status only one time after previous
> > + * segment being closed.
> > */
> > - refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
> > + locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
> > + locate_dirty_segment(sbi, GET_SEGNO(sbi, *new_blkaddr));
> >
> > mutex_unlock(&sit_i->sentry_lock);
> >
> >
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