On Sun, May 04, 2003 at 02:05:37PM -0700, Andrew Morton wrote:
> About half of the s_umount grabbers perform that check. The others might be
> buggy. I'm not sure - it's all rather gunky in there and hard to tell what
> the rules are.
Very simple, actually - if you are holding an active reference, no checks
are needed. If you do not (as in this case) - you need to check that
filesystem is not in the middle of shutdown after getting ->s_umount.
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