[Bug 222288] g_bio leak after zfs ABD commit

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222288

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Wed Sep 20 08:27:21 UTC 2017
New revision: 323796
URL: https://svnweb.freebsd.org/changeset/base/323796

Log:
  fix memory leak in g_bio zone introduced in r320452, another ABD fallout

  I overlooked the fact that that ZIO_IOCTL_PIPELINE does not include
  ZIO_STAGE_VDEV_IO_DONE stage.  We do allocate a struct bio for an ioctl
  zio (a disk cache flush), but we never freed it.

  This change splits bio handling into two groups, one for normal
  read/write i/o that passes data around and, thus, needs the abd data
  tranform; the other group is for "data-less" i/o such as trim and cache
  flush.

  PR:           222288
  Reported by:  Dan Nelson <dnelson at allantgroup.com>
  Tested by:    Borja Marcos <borjam at sarenet.es>
  MFC after:    10 days

Changes:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c

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