[PATCH v3 00/17] enable nvmet-fc for blktests

[Daniel Wagner]

Another update on getting nvmet-fc ready for blktests. The main change here is
that I tried make sense of the ref count taking in nvmet-fc. When running
blktests with the auto connect udev rule activated the additional connect
attempt etc made nvmet-fc explode and choke everywhere. After a lot of poking
and pondering I decided to change the rules who the ref counts are taken for the
ctrl, association, target port and host port. This made a big difference and I
am able to get blktests pass the tests.

Also KASAN was reporting a lot of UAFs. There are still some problems left as I
can still observe hangers when running blktests in a loop for a while. But it
doesn't explode immediately so I consider this a win.

Apropos KASAN, it still reports the problem from [1], so anyone who want to run
this series needs to revert ee6fdc5055e9 ("nvme-fc: fix race between error
recovery and creating association").

The first four patches are independent of the rest and could go in sooner.

[1] https://lore.kernel.org/linux-nvme/hkhl56n665uvc6t5d6h3wtx7utkcorw4xlwi7d2t2bnonavhe6@xaan6pu43ap6/

changes:
v3:
 - collected all patches into one series
 - updated ref counting in nvmet-fc

v2:
  - added RBs
  - added new patches
  - https://lore.kernel.org/linux-nvme/20230620133711.22840-1-dwagner@suse.de/
  
v1:
  - https://lore.kernel.org/linux-nvme/20230615094356.14878-1-dwagner@suse.de/ 


Daniel Wagner (16):
  nvmet: report ioccsz and iorcsz for disc ctrl
  nvmet-fc: remove unnecessary bracket
  nvmet-trace: avoid dereferencing pointer too early
  nvmet-trace: null terminate device name string correctly
  nvmet-fcloop: Remove remote port from list when unlinking
  nvme-fc: Do not wait in vain when unloading module
  nvmet-fc: Release reference on target port
  nvmet-fc: untangle cross refcounting objects
  nvmet-fc: free queue and assoc directly
  nvmet-fc: hold reference on hostport match
  nvmet-fc: remove null hostport pointer check
  nvmet-fc: do not tack refs on tgtports from assoc
  nvmet-fc: abort command if when there is binding
  nvmet-fc: free hostport after release reference to tgtport
  nvmet-fc: avoid deadlock on delete association path
  nvmet-fc: take ref count on tgtport before delete assoc

 drivers/nvme/host/fc.c          |  20 +++--
 drivers/nvme/target/discovery.c |  13 +++
 drivers/nvme/target/fc.c        | 153 ++++++++++++++++++--------------
 drivers/nvme/target/fcloop.c    |   7 +-
 drivers/nvme/target/trace.c     |   6 +-
 drivers/nvme/target/trace.h     |  33 ++++---
 6 files changed, 135 insertions(+), 97 deletions(-)

-- 
2.43.0