[v2,0/7] Add protocol specific config subsection

Message

Benjamin Marzinski April 14, 2022, 4:27 a.m. UTC

Some storage arrays can be accessed using multiple protocols at the same
time.  I've have customers request the ability to set different values
for the path specific timeouts, like fast_io_fail_tmo, based on the
protocol used to access the path. In order to make this possible, this
patchset adds a new protocol subsection to the overrides section. This
allows users to set a device config's path specific timeouts, such as
dev_loss_tmo, fast_io_fail_tmo, and eh_deadline on a per-protocol basis.

Changes from v1 (all based on suggestions from Martin Wilck):
0003: Adds the protocol subsection to the overrides section instead of
      the device subsection, pulling in code from original patch 0007
0005: Checks the pctable of the overrides section instead of the
      hwes, pulling in code from original patch 0007
Original patches 0006 and 0007 have been removed.
0007: (original patch 0009) modified the man page to no longer
      reference the protocol subsection under the device
      subsection

Benjamin Marzinski (7):
  libmultipath: steal the src string pointer in merge_str()
  libmultipath: make protocol_name global
  libmultipath: add a protocol subsection to multipath.conf
  libmultipath: Set the scsi timeout parameters by path
  libmultipath: check the overrides pctable for path variables
  libmultipath: fix eh_deadline documentation
  libmultipath: Add documentation for the protocol subsection

 libmultipath/config.c      |  99 ++++++++++++++++++---
 libmultipath/config.h      |  10 +++
 libmultipath/configure.c   |   5 +-
 libmultipath/dict.c        |  99 +++++++++++++++++++++
 libmultipath/discovery.c   | 174 +++++++++++++++++++++----------------
 libmultipath/discovery.h   |   2 +-
 libmultipath/print.c       |  67 ++++++++++----
 libmultipath/propsel.c     |  65 +++++++++-----
 libmultipath/propsel.h     |   6 +-
 libmultipath/structs.c     |  19 +++-
 libmultipath/structs.h     |   7 +-
 multipath/multipath.conf.5 |  36 ++++++++
 12 files changed, 452 insertions(+), 137 deletions(-)