K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2018-01-09T10:51:44.343705Z
K 7
svn:log
V 635
Generalize the fix from r322757 and apply it to several more places.

The code accesses bp->b_dep without owning the ufs mount softdep lock,
which makes it possible for the derefenced workitem to be freed in
parallel.  In particular, the deallocate_dependencies(),
softdep_disk_io_initiation() and softdep_disk_write_complete() are
affected.

Move the code to safely calculate ump from the buffer with
dependencies into the helper softdep_bp_to_mp() and use it for all
found cases.

Tested by:	pho (as part of the bigger patch)
Reviewed by:	mckusick (as part of the bigger patch)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END