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Konstantin Belousov authored
Other threads observing the non-NULL um_softdep can assume that it is safe to use it. This is important for ro->rw remounts where change from read-only to read-write status cannot be made atomic. Reviewed by: mckusick Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D29178
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