We might own the last use reference, and then vrele() at the end would need to take the dvp vnode lock to inactivate, which causes deadlock with vp. We cannot vrele() dvp from start since this might unlock ldvp. Handle it by holding the vnode and dropping use ref after lowerfs VOP_VPUT_PAIR() ended. This effectivaly requires unlock of the vp vnode after VOP_VPUT_PAIR(), so the call is changed to set unlock_vp to true unconditionally. This opens more opportunities for vp to be reclaimed, if lvp is still alive we reinstantiate vp with null_nodeget(). Reported and tested by: pho Reviewed by: mckusick Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D29178 |
||
---|---|---|
.. | ||
null_subr.c | ||
null_vfsops.c | ||
null_vnops.c | ||
null.h |