From: Martin Wilck <mwilck@xxxxxxxx> Hi Christophe, hi Ben, This is part V of a larger patch series for multipath-tools I've been preparing. It's based on the previously submitted part IV. The full series will also be available here: https://github.com/mwilck/multipath-tools/tree/ups/submit-2008 This part is tagged "submit-200812-5". The series addresses several issues with missing, unintialized, and removed paths. The motivation was that I strongly dislike the side effects of disassemble_map(), adding paths and setting WWIDs while parsing map parameters. IMO this has always been a layering violation. This patch set adds a new function dedicated to handling paths which have not been detected via udev but are present as members of dm maps. That makes it much easier to track and improve the logic applied when such devices are detected. I believe that the new logic will also fix the issue recently reported by Chongyun ("libmultipath/dmparser: add missing path with good status when sync state with dm kernel"). At least, the approach is very similar, although the call to pathinfo() for new devices now happens in update_pathvec_from_dm() rather than in disassemble_map(). The patch set also gets rid of the "is_daemon" argument for disassemble_map(), causing semantics in daemon and non-daemon mode. The reason for this parameter goes way back into history; it was avoiding to re-add manually removed paths because they were still showing up in maps. But OTOH we must add missing devices which we've failed to detect. The patch set handles this by tracking the state of "being removed" as a new init state, and only actually removing the paths from pathvec when they don't show up in maps any more. Changes v1 -> v2, as suggested by Ben Marzinski: * 55: "libmultipath: add uninitialize_path()" * 58: "libmultipath: verify_paths(): don't delete paths from pathvec" - context changes * 61: "libmultipath: adopt_paths(): skip removed paths" - set pp->mpp before checking for INIT_REMOVED * 63: "multipathd: deal with INIT_REMOVED during path addition" - BUG message if path not mpp member - set pp->tick to 1 to make sure paths are quickly reinstated - remove "was_removed" variable * 64: "multipathd: check_path(): set retrigger_delay if necessary" - drop, replace with "libmultipath: orphan_paths(): avoid BUG message" * 65: libmultipath: add update_pathvec_from_dm() - add comment about pp->udev being initialized - discard paths with pathinfo() errors - set must_reload if pathgroup was removed * 66: "libmultipath: update_pathvec_from_dm: handle pp->mpp mismatch" - handle the two failure cases "pp->mpp points to different map" and "wrong wwid" differently. In the latter case, use orphan_path() * 71: "multipath: use update_pathvec_from_dm()" - use DI_NOIO for CMD_LIST_SHORT. In update_pathvec_from_dm, mask out DI_NOIO when checking existing paths NOTE: In my v1 submission, I made a mistake when sending part V, so that *patch number 54 is present twice* in the full series. I deliberately didn't correct that this time, to preserve numbering. Regards Martin Martin Wilck (21): libmultipath: protect use of pp->udev libmultipath: add uninitialize_path() multipath-tools: introduce INIT_REMOVED state libmultipath: update_mpp_paths(): handle INIT_REMOVED libmultipath: verify_paths(): don't delete paths from pathvec libmultipath: sync_paths(): handle INIT_REMOVED libmultipath: orphan_paths(): delete paths in INIT_REMOVED state libmultipath: adopt_paths(): skip removed paths multipathd: ev_remove_path(): use INIT_REMOVED multipathd: deal with INIT_REMOVED during path addition libmultipath: orphan_paths(): avoid BUG message libmultipath: add update_pathvec_from_dm() libmultipath: update_pathvec_from_dm: handle pp->mpp mismatch libmultipath: disassemble_map(): always search paths by dev_t libmultipath: disassemble_map(): require non-NULL pathvec libmultipath: disassemble_map(): get rid of "is_daemon" argument libmultipath: disassemble_map(): do not change pathvec and WWIDs multipath: use update_pathvec_from_dm() libmpathpersist: use update_pathvec_from_dm() libmultipath: decrease loglevel in store_path() libmultipath: dmparser: constify function arguments libmpathpersist/mpath_persist.c | 56 +---- libmultipath/configure.c | 2 +- libmultipath/discovery.c | 15 +- libmultipath/dmparser.c | 70 ++---- libmultipath/dmparser.h | 4 +- libmultipath/prioritizers/alua_rtpg.c | 6 +- libmultipath/structs.c | 21 +- libmultipath/structs.h | 6 + libmultipath/structs_vec.c | 293 +++++++++++++++++++++++--- libmultipath/structs_vec.h | 11 +- multipath/main.c | 72 +------ multipathd/cli_handlers.c | 54 ++++- multipathd/main.c | 112 ++++++++-- 13 files changed, 479 insertions(+), 243 deletions(-) -- 2.28.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
