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md: skip redundant raid_disks update when value is unchanged

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Calling update_raid_disks() with the same value as the current one
can trigger unnecessary work. For example, RAID1 will reallocate
resources such as the mempool for r1bio.

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
Link: https://patch.msgid.link/20260428130524.448063-1-abd.masalkhi@gmail.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Abd-Alrhman Masalkhi 2026-04-28 15:05:24 +02:00 committed by Yu Kuai
parent 1d24d4c1ea
commit abaf478382
1 changed files with 4 additions and 3 deletions
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7
drivers/md/md.c
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@ -4414,9 +4414,10 @@ raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
err = mddev_suspend_and_lock(mddev);
if (err)
return err;
if (mddev->pers)
err = update_raid_disks(mddev, n);
else if (mddev->reshape_position != MaxSector) {
if (mddev->pers) {
if (n != mddev->raid_disks)
err = update_raid_disks(mddev, n);
} else if (mddev->reshape_position != MaxSector) {
struct md_rdev *rdev;
int olddisks = mddev->raid_disks - mddev->delta_disks;