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md: Add new_level sysfs interface

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Now reshape supports two ways: with backup file or without backup file.
For the situation without backup file, it needs to change data offset.
It doesn't need systemd service mdadm-grow-continue. So it can finish
the reshape job in one process environment. It can know the new level
from mdadm --grow command and can change to new level after reshape
finishes.

For the situation with backup file, it needs systemd service
mdadm-grow-continue to monitor reshape progress. So there are two process
envolved. One is mdadm --grow command whick kicks off reshape and wakes
up mdadm-grow-continue service. The second process is the service, which
doesn't know the new level from the first process.

In kernel space mddev->new_level is used to record the new level when
doing reshape. This patch adds a new interface to help mdadm update
new_level and sync it to metadata. Then mdadm-grow-continue can read the
right new_level.

Commit log revised by Song Liu. Please refer to the link for more details.

Signed-off-by: Xiao Ni <xni@redhat.com>
Link: https://lore.kernel.org/r/20240904235453.99120-1-xni@redhat.com
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Xiao Ni 2024-09-05 07:54:53 +08:00 committed by Song Liu
parent 2d2b3bc145
commit d981ed8419
1 changed files with 29 additions and 0 deletions
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29
drivers/md/md.c
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@ -4052,6 +4052,34 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_level =
__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
static ssize_t
new_level_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->new_level);
}
static ssize_t
new_level_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int n;
int err;
err = kstrtouint(buf, 10, &n);
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
mddev->new_level = n;
md_update_sb(mddev, 1);
mddev_unlock(mddev);
return len;
}
static struct md_sysfs_entry md_new_level =
__ATTR(new_level, 0664, new_level_show, new_level_store);
static ssize_t
layout_show(struct mddev *mddev, char *page)
{
@ -5583,6 +5611,7 @@ __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_new_level.attr,
&md_layout.attr,
&md_raid_disks.attr,
&md_uuid.attr,