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/freebsd-11-stable/sys/ufs/ufs/
H A Dufs_dirhash.cdiff 184651 Tue Nov 04 17:03:33 MST 2008 jhb Quiet a WITNESS warning with the dirhash sx locks by setting the DUPOK
flag. Specifically, if two threads race to create a dirhash for a
directory, then one might already have created a private dirhash
structure (and locked it) when it realizes the directory now has a
structure and tries to lock that one.

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