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SubjectRe: [PATCH] f2fs: continuous counting for 'issued' in __issue_discard_cmd_orderly()
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On 2022/11/22 0:11, Yuwei Guan wrote:
> As the 'dcc->discard_granularity' and 'dcc->max_ordered_discard' can be set
> at the user space, and if the 'dcc->max_ordered_discard' is set larger than
> 'dcc->discard_granularity' in DPOLICY_BG mode, or it's a volume device,
> discard_granularity can be tuned to 1 in f2fs_tuning_parameters(),
> it will may send more requests than the number of 'dpolicy->max_requests'
> in issue_discard_thread().
>
> This patch will fix the issue.
>
> Signed-off-by: Yuwei Guan <Yuwei.Guan@zeekrlife.com>
> ---
> fs/f2fs/segment.c | 17 ++++++++---------
> 1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 8b0b76550578..b0157bf392fb 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1379,8 +1379,8 @@ static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
> return 0;
> }
>
> -static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
> - struct discard_policy *dpolicy)
> +static int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
> + struct discard_policy *dpolicy, int *issued)
> {
> struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
> struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
> @@ -1388,7 +1388,6 @@ static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
> struct discard_cmd *dc;
> struct blk_plug plug;
> unsigned int pos = dcc->next_pos;
> - unsigned int issued = 0;
> bool io_interrupted = false;
>
> mutex_lock(&dcc->cmd_lock);
> @@ -1415,9 +1414,9 @@ static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
> }
>
> dcc->next_pos = dc->lstart + dc->len;
> - err = __submit_discard_cmd(sbi, dpolicy, dc, &issued);
> + err = __submit_discard_cmd(sbi, dpolicy, dc, issued);
>
> - if (issued >= dpolicy->max_requests)
> + if (*issued >= dpolicy->max_requests)
> break;
> next:
> node = rb_next(&dc->rb_node);
> @@ -1433,10 +1432,10 @@ static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
>
> mutex_unlock(&dcc->cmd_lock);
>
> - if (!issued && io_interrupted)
> - issued = -1;
> + if (!(*issued) && io_interrupted)
> + *issued = -1;
>
> - return issued;
> + return *issued;

A little weired that __issue_discard_cmd_orderly() will output the data
in both return value and @issued parameter.

How about changing type of return value __issue_discard_cmd_orderly()
from unsigned int to void.

Thanks,

> }
> static unsigned int __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
> struct discard_policy *dpolicy);
> @@ -1465,7 +1464,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
> break;
>
> if (i + 1 < dcc->max_ordered_discard && dpolicy->ordered)
> - return __issue_discard_cmd_orderly(sbi, dpolicy);
> + return __issue_discard_cmd_orderly(sbi, dpolicy, &issued);
>
> pend_list = &dcc->pend_list[i];
>

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