svn commit: r264392 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
killing at multiplay.co.uk
Sun Apr 13 01:43:57 UTC 2014
Interesting, I'd be curious to know what the panic for this looks like?
----- Original Message -----
From: "Davide Italiano" <davide at FreeBSD.org>
> Author: davide
> Date: Sun Apr 13 01:15:37 2014
> New Revision: 264392
> URL: http://svnweb.freebsd.org/changeset/base/264392
> Fix a panic in zfs_rename().
> this is due to a wrong dereference of a vnode when it's not locked and
> can be (potentially) recycled. 'sdvp' cannot be locked on zfs_rename()
> entry point because the VFS can't be sure that this scenario is
> LOR-free (it might violate the parent->child lock acquisition rule).
> Dereference 'tdvp' instead, which is already locked on entry, and access
> 'sdvp' fields only when it's safe, i.e. under ZFS_ENTER scope.
> While at it, remove the usage of VOP_REALVP, as long as this is a NOP
> on FreeBSD.
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