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SubjectRe: [PATCH] md: allow to set the fail_fast on RAID1/RAID10
ping ...

Thanks,
Feng Li

Li Feng <fengli@smartx.com> 于2021年9月13日周一 上午11:22写道:
>
> When the running RAID1/RAID10 need to be set with the fail_fast flag,
> we have to remove each device from RAID and re-add it again with the
> --fail_fast flag.
>
> Export the fail_fast flag to the userspace to support the read and
> write.
>
> Signed-off-by: Li Feng <fengli@smartx.com>
> ---
> drivers/md/md.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index ae8fe54ea358..ce63972a4555 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -3583,6 +3583,35 @@ ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
> static struct rdev_sysfs_entry rdev_ppl_size =
> __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
>
> +static ssize_t
> +fail_fast_show(struct md_rdev *rdev, char *page)
> +{
> + return sprintf(page, "%d\n", test_bit(FailFast, &rdev->flags));
> +}
> +
> +static ssize_t
> +fail_fast_store(struct md_rdev *rdev, const char *buf, size_t len)
> +{
> + int ret;
> + bool bit;
> +
> + ret = kstrtobool(buf, &bit);
> + if (ret)
> + return ret;
> +
> + if (test_bit(FailFast, &rdev->flags) && !bit) {
> + clear_bit(FailFast, &rdev->flags);
> + md_update_sb(rdev->mddev, 1);
> + } else if (!test_bit(FailFast, &rdev->flags) && bit) {
> + set_bit(FailFast, &rdev->flags);
> + md_update_sb(rdev->mddev, 1);
> + }
> + return len;
> +}
> +
> +static struct rdev_sysfs_entry rdev_fail_fast =
> +__ATTR(fail_fast, 0644, fail_fast_show, fail_fast_store);
> +
> static struct attribute *rdev_default_attrs[] = {
> &rdev_state.attr,
> &rdev_errors.attr,
> @@ -3595,6 +3624,7 @@ static struct attribute *rdev_default_attrs[] = {
> &rdev_unack_bad_blocks.attr,
> &rdev_ppl_sector.attr,
> &rdev_ppl_size.attr,
> + &rdev_fail_fast.attr,
> NULL,
> };
> static ssize_t
> --
> 2.31.1
>

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