Currently much of nfsd's administration is serialized under the global nfsd_mutex, even though most of the objects managed under it are segregated by net namespace.
This patchset does a couple of small cleanups and then adds a new per-net mutex and moves all of the appropriate per-net data structures to be protected by it instead of the global mutex. The filecache is given its own mutex, and the global mutex is renamed and left for managing just the few remaning global objects. I also had an LLM cook up some selftests so we can hopefully keep all of this working properly in the future. Please consider for v7.4. Thanks, Jeff Signed-off-by: Jeff Layton <[email protected]> --- Jeff Layton (8): nfsd: clear NFSD_NET_UP before dropping the generic resource reference nfsd: make max_blksize a per-namespace setting nfsd: move the control plane to a per-namespace mutex nfsd: rename nfsd_mutex to nfsd_global_mutex nfsd: give the open file cache its own mutex selftests/nfsd: factor the netlink plumbing into a shared header selftests/nfsd: add cross-namespace isolation tests selftests/nfsd: add a cross-namespace control-plane soak fs/nfsd/export.c | 22 +- fs/nfsd/filecache.c | 36 +- fs/nfsd/netns.h | 16 + fs/nfsd/nfs4proc.c | 4 +- fs/nfsd/nfs4state.c | 8 +- fs/nfsd/nfsctl.c | 129 ++--- fs/nfsd/nfsd.h | 4 +- fs/nfsd/nfssvc.c | 146 ++++-- tools/testing/selftests/nfsd/Makefile | 2 + tools/testing/selftests/nfsd/config | 6 + tools/testing/selftests/nfsd/nfsd_netlink.h | 319 ++++++++++++ .../testing/selftests/nfsd/nfsd_netlink_listener.c | 301 +---------- tools/testing/selftests/nfsd/nfsd_netns_isolation | Bin 0 -> 49192 bytes .../testing/selftests/nfsd/nfsd_netns_isolation.c | 450 ++++++++++++++++ tools/testing/selftests/nfsd/nfsd_netns_stress | Bin 0 -> 39232 bytes tools/testing/selftests/nfsd/nfsd_netns_stress.c | 572 +++++++++++++++++++++ tools/testing/selftests/nfsd/settings | 2 +- 17 files changed, 1580 insertions(+), 437 deletions(-) --- base-commit: aeaddc6a3711283c09a9183068897d4fe1fb464f change-id: 20260918-nfsd-per-net-mutex-8655764940ac Best regards, -- Jeff Layton <[email protected]>
