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md: be more careful setting MD_CHANGE_CLEAN

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When MD_CHANGE_CLEAN is set we might block in md_write_start.
So we should only set it when fairly sure that something will clear
it.

There are two places where it is set so as to encourage a metadata
update to record the progress of resync/recovery.  This should only
be done if the internal metadata update mechanisms are in use, which
can be tested by by inspecting '->persistent'.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2010-06-01 19:37:26 +10:00
parent f4be6b43f1
commit 676e42d896
2 changed files with 4 additions and 2 deletions
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3
drivers/md/md.c
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@@ -6753,7 +6753,8 @@ void md_do_sync(mddev_t *mddev)
atomic_read(&mddev->recovery_active) == 0);
mddev->curr_resync_completed =
mddev->curr_resync;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
if (mddev->persistent)
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}