From: J. Bruce Fields Date: Wed, 3 Feb 2021 16:42:13 +0000 (-0500) Subject: nfsd: register pernet ops last, unregister first X-Git-Tag: v5.15~1685^2~4 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=bd5ae9288d64;p=mirror_ubuntu-kernels.git nfsd: register pernet ops last, unregister first These pernet operations may depend on stuff set up or torn down in the module init/exit functions. And they may be called at any time in between. So it makes more sense for them to be the last to be registered in the init function, and the first to be unregistered in the exit function. In particular, without this, the drc slab is being destroyed before all the per-net drcs are shut down, resulting in an "Objects remaining in nfsd_drc on __kmem_cache_shutdown()" warning in exit_nfsd. Reported-by: Zhi Li Fixes: 3ba75830ce17 "nfsd4: drc containerization" Signed-off-by: J. Bruce Fields Signed-off-by: Chuck Lever --- diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index f6d5d783f4a4..0759e589ab52 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1522,12 +1522,9 @@ static int __init init_nfsd(void) int retval; printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); - retval = register_pernet_subsys(&nfsd_net_ops); - if (retval < 0) - return retval; retval = register_cld_notifier(); if (retval) - goto out_unregister_pernet; + return retval; retval = nfsd4_init_slabs(); if (retval) goto out_unregister_notifier; @@ -1544,9 +1541,14 @@ static int __init init_nfsd(void) goto out_free_lockd; retval = register_filesystem(&nfsd_fs_type); if (retval) + goto out_free_exports; + retval = register_pernet_subsys(&nfsd_net_ops); + if (retval < 0) goto out_free_all; return 0; out_free_all: + unregister_pernet_subsys(&nfsd_net_ops); +out_free_exports: remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); out_free_lockd: @@ -1559,13 +1561,12 @@ out_free_slabs: nfsd4_free_slabs(); out_unregister_notifier: unregister_cld_notifier(); -out_unregister_pernet: - unregister_pernet_subsys(&nfsd_net_ops); return retval; } static void __exit exit_nfsd(void) { + unregister_pernet_subsys(&nfsd_net_ops); nfsd_drc_slab_free(); remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); @@ -1575,7 +1576,6 @@ static void __exit exit_nfsd(void) nfsd4_exit_pnfs(); unregister_filesystem(&nfsd_fs_type); unregister_cld_notifier(); - unregister_pernet_subsys(&nfsd_net_ops); } MODULE_AUTHOR("Olaf Kirch ");