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/freebsd-10.1-release/sys/fs/msdosfs/
H A Dmsdosfs_lookup.cdiff 204474 Sun Feb 28 15:20:15 MST 2010 kib Fix the race between dotdot lookup and forced unmount, by using
msdosfs-specific variant of vn_vget_ino(), msdosfs_deget_dotdot().

As was done for UFS, relookup the dotdot denode after the call to
msdosfs_deget_dotdot(), because vnode lock is dropped and directory
might be moved.

Tested by: pho
MFC after: 3 weeks

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