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md: don't clear MD_CHANGE_CLEAN in md_update_sb() for external arrays

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If this bit is cleared in md_update_sb() the kernel will allow writes to the
array if userspace triggers md_allow_write(), e.g. through stripe_cache_size,
when mdmon is not active.  When mdmon is active the array transitions to
active-idle bypassing write-pending, setting up a race for mdmon to set the
array clean before a write arrives.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Dan Williams 2010-08-30 17:33:33 +10:00 committed by NeilBrown
parent 7c44ece988
commit bd52b74626
1 changed files with 3 additions and 2 deletions
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5
drivers/md/md.c
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@ -2167,9 +2167,10 @@ static void md_update_sb(mddev_t * mddev, int force_change)
rdev->recovery_offset = mddev->curr_resync_completed;
}
if (mddev->external || !mddev->persistent) {
if (!mddev->persistent) {
if (!mddev->external)
clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
clear_bit(MD_CHANGE_DEVS, &mddev->flags);
clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
wake_up(&mddev->sb_wait);
return;
}