On 2017/3/9 5:39, Jaegeuk Kim wrote:
> 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.
That's right.
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Thanks,
>
> 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
>>>
>
> .
>
