From 24395a85d8efe6eee477ea35c73d045a8dd7a3a1 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 6 Nov 2009 14:59:27 +1100 Subject: md: don't clear endpoint for resync when resync is interrupted. If a 'sync_max' has been set (via sysfs), it is wrong to clear it until a resync (or reshape or recovery ...) actually reached that point. So if a resync is interrupted (e.g. by device failure), leave 'resync_max' unchanged. This is particularly important for 'reshape' operations that do not change the size of the array. For such operations mdadm needs to monitor the reshape taking rolling backups of the section being reshaped. If resync_max gets cleared, the reshape can get ahead of mdadm and then the backups that mdadm creates are useless. This is suitable for 2.6.31.y stable kernels. Cc: stable@kernel.org Signed-off-by: NeilBrown --- drivers/md/md.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 10eb1fce975..e64c971038d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6504,8 +6504,9 @@ void md_do_sync(mddev_t *mddev) skip: mddev->curr_resync = 0; mddev->curr_resync_completed = 0; - mddev->resync_min = 0; - mddev->resync_max = MaxSector; + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + /* We completed so max setting can be forgotten. */ + mddev->resync_max = MaxSector; sysfs_notify(&mddev->kobj, NULL, "sync_completed"); wake_up(&resync_wait); set_bit(MD_RECOVERY_DONE, &mddev->recovery); -- cgit v1.2.3 From 8dee7211467a56b7eb4e4359efb0aa4a72e1b6f3 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 6 Nov 2009 14:59:29 +1100 Subject: md/raid5: make sure curr_sync_completes is uptodate when reshape starts This value is visible through sysfs and is used by mdadm when it manages a reshape (backing up data that is about to be rearranged). So it is important that it is always correct. Current it does not get updated properly when a reshape starts which can cause problems when assembling an array that is in the middle of being reshaped. This is suitable for 2.6.31.y stable kernels. Cc: stable@kernel.org Signed-off-by: NeilBrown --- drivers/md/raid5.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 81abefc172d..dcce204b6c7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4049,6 +4049,8 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped sector_nr = conf->reshape_progress; sector_div(sector_nr, new_data_disks); if (sector_nr) { + mddev->curr_resync_completed = sector_nr; + sysfs_notify(&mddev->kobj, NULL, "sync_completed"); *skipped = 1; return sector_nr; } -- cgit v1.2.3