Hi Jaegeuk,
On 2017/3/8 10:49, Jaegeuk Kim wrote:
> On 03/07, Jaegeuk Kim wrote:
>> Hi Yunlei,
>>
>> On 03/02, Yunlei He wrote:
>>> This patch add a function to punch discard command if one segment
>>> reuse before discard. Split this segment from multi-segments discard
>>> range, and discard the left bigger range.
>>>
>>> Signed-off-by: Yunlei He <heyun...@huawei.com>
>>> ---
>>> fs/f2fs/segment.c | 18 +++++++++++++++++-
>>> 1 file changed, 17 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>> index 4bd7a8b..1e1d5d3 100644
>>> --- a/fs/f2fs/segment.c
>>> +++ b/fs/f2fs/segment.c
>>> @@ -672,6 +672,22 @@ static void __remove_discard_cmd(struct f2fs_sb_info
>>> *sbi, struct discard_cmd *d
>>> kmem_cache_free(discard_cmd_slab, dc);
>>> }
>>>
>>> +static void __punch_discard_cmd(struct f2fs_sb_info *sbi, struct
>>> discard_cmd *dc, block_t blkaddr)
>>> +{
>>> + block_t end_block = START_BLOCK(sbi, GET_SEGNO(sbi, blkaddr) + 1);
>>> +
>>> + if (dc->lstart + dc->len <= end_block) {
>>> + __remove_discard_cmd(sbi, dc);
>>> + return;
>>> + }
>>> +
>>> + if (blkaddr - dc->lstart < dc->lstart + dc->len - end_block) {
>>> + dc->lstart = end_block;
>>> + dc->len -= (end_block - dc->lstart);
>>
>> I just missed one thing which we already have a bio to submit later. So, in
>> order to do this, we should manage dc->bio as well.
>> Let me think about whole flow again.
>
> Please take a look at:
>
> http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=ef63d148d469f249622afe9e89fc273848ee427b
> http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=eea59dd279d5d34eb8d9652b7af1bd9e45a3b69e
It looks good to me.
Thanks.
>
> Thanks,
>
>>
>> Thanks,
>>
>>> + } else
>>> + dc->len = blkaddr - dc->lstart;
>>> +}
>>> +
>>> /* This should be covered by global mutex, &sit_i->sentry_lock */
>>> void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
>>> {
>>> @@ -708,7 +724,7 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi,
>>> block_t blkaddr)
>>> if (blkaddr == NULL_ADDR) {
>>> list_for_each_entry_safe(dc, tmp, wait_list, list) {
>>> wait_for_completion_io(&dc->wait);
>>> - __remove_discard_cmd(sbi, dc);
>>> + __punch_discard_cmd(sbi, dc, blkaddr);
>>> }
>>> }
>>> mutex_unlock(&dcc->cmd_lock);
>>> --
>>> 2.10.1
>>
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>
> .
>
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