Re: [libvirt] [PATCH v2 0/6] nwfilter adjustments for common object

v1: https://www.redhat.com/archives/libvir-list/2017-June/msg00079.html Changes since v1 (if I can recall all of them!): Patches 1, 4, 8-13 were pushed Patches 2, 3, 5-7 are dropped This this is a rework of patches 14-17 Patch 1 (former patch14): * Requested adjustments made to ACK'd patch, but since this and the remaining ones were related I didn't yet push it. Patch 2 (new): * From review though... As it turns out, virNWFilterDefEqual doesn't require the @cmpUUIDs patch. Patch 3 (fromer patch 15): * Fixed the line as requested. Patch was ACK'd by like Patch 1 I held onto it since it was related. Patch 4 (former patch 16): * Let's call it a complete rewrite. Rather than rely solely on the refcnt of the object, I've added/implemented a 'trylock' mechanism which essentially will allow the subsequent patch to use the virObjectLockable (e.g. a non recursive lock). Of course as I got further into the code - I think I've come to the conclusion that there isn't a way for a @def to disappear between threads with a refcnt only mechanism because there's a few other serialized locks which would need to be hurdled before hand. Still as I found out while running the Avocado test 'nwfilter_update_vm_running.update_arp_rule' the recursion would occur because the AssignDef code would call the Instantiation with the lock from the def being updated and that's where all the awful magic needs to occur. Additionally, I found that one wouldn't want to attempt to lock the nwfilters list inside the virNWFilterObjListFindInstantiateFilter because AssignDef already had that lock. I debated needing a recursive lock there until I came to the conclusion that the list couldn't change because the DefineXML is protected by a driver level lock (as is the Undefine and Reload paths). Patch 5 (former patch 17): * No changes, it was ACK'd, but without 1-4 is useless Patch 6 (NEW): * Remove the need for the driver level lock for a few API's since we have self locking nwfilters list. Also left comments in the 3 places where that lock remained to hopefully cause someone great anxiety if they decided to attempt to remove the lock without first consulting a specialist. NB: Ran all of the changes through the 'nwfilter' tests found in the Avocado test suite. John Ferlan (6): nwfilter: Add @refs logic to __virNWFilterObj nwfilter: Remove unnecessary UUID comparison bypass nwfilter: Convert _virNWFilterObjList to be a virObjectLockable nwfilter: Remove recursive locking for nwfilter instantiation nwfilter: Convert virNWFilterObj to use virObjectLockable nwfilter: Remove need for nwfilterDriverLock in some API's src/conf/virnwfilterobj.c | 635 ++++++++++++++++++++++++--------- src/conf/virnwfilterobj.h | 12 +- src/libvirt_private.syms | 6 +- src/nwfilter/nwfilter_driver.c | 66 ++-- src/nwfilter/nwfilter_gentech_driver.c | 66 +++- src/util/virobject.c | 24 ++ src/util/virobject.h | 4 + src/util/virthread.c | 5 + src/util/virthread.h | 1 + 9 files changed, 586 insertions(+), 233 deletions(-)