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If ->in_sync is being set just as md_write_start() is being called, it is possible that set_in_sync() won't see the elevated ->writes_pending, and md_write_start() won't see the set ->in_sync. To close this race, re-test ->writes_pending after setting ->in_sync, and add memory barriers to ensure the increment of ->writes_pending will be seen by the time of this second test, or the new ->in_sync will be seen by md_write_start(). Add a spinlock to array_state_show() to ensure this temporary instability is never visible from userspace. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com> |
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