From 7ea34ac15e45b790f2faa7d5f69c560a43f2de70 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 21 Mar 2012 09:52:05 -0400 Subject: nfsd: add a per-net-namespace struct for nfsd Eventually, we'll need this when nfsd gets containerized fully. For now, create a struct on a per-net-namespace basis that will just hold a pointer to the cld_net structure. That struct will hold all of the per-net data that we need for the cld tracker. Eventually we can add other pernet objects to struct nfsd_net. Signed-off-by: Jeff Layton Signed-off-by: J. Bruce Fields --- fs/nfsd/nfsctl.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'fs/nfsd/nfsctl.c') diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 64c24af8d7ea..141197e04703 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -19,6 +19,7 @@ #include "nfsd.h" #include "cache.h" #include "fault_inject.h" +#include "netns.h" /* * We have a single directory with several nodes in it. @@ -1124,14 +1125,23 @@ static int create_proc_exports_entry(void) } #endif +int nfsd_net_id; +static struct pernet_operations nfsd_net_ops = { + .id = &nfsd_net_id, + .size = sizeof(struct nfsd_net), +}; + 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 = nfsd4_init_slabs(); if (retval) - return retval; + goto out_unregister_pernet; nfs4_state_init(); retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */ if (retval) @@ -1169,6 +1179,8 @@ out_free_stat: nfsd_fault_inject_cleanup(); out_free_slabs: nfsd4_free_slabs(); +out_unregister_pernet: + unregister_pernet_subsys(&nfsd_net_ops); return retval; } @@ -1184,6 +1196,7 @@ static void __exit exit_nfsd(void) nfsd4_free_slabs(); nfsd_fault_inject_cleanup(); unregister_filesystem(&nfsd_fs_type); + unregister_pernet_subsys(&nfsd_net_ops); } MODULE_AUTHOR("Olaf Kirch "); -- cgit v1.2.3 From 813fd320c16691eac508fe350b4ee7362c6c4a56 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 21 Mar 2012 09:52:08 -0400 Subject: nfsd: add notifier to handle mount/unmount of rpc_pipefs sb In the event that rpc_pipefs isn't mounted when nfsd starts, we must register a notifier to handle creating the dentry once it is mounted, and to remove the dentry on unmount. Signed-off-by: Jeff Layton Signed-off-by: J. Bruce Fields --- fs/nfsd/netns.h | 1 + fs/nfsd/nfs4recover.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/nfsctl.c | 9 ++++++++- 3 files changed, 53 insertions(+), 1 deletion(-) (limited to 'fs/nfsd/nfsctl.c') diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index 12e0cff435b4..66eac332bf8d 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -31,4 +31,5 @@ struct nfsd_net { }; extern int nfsd_net_id; +extern struct notifier_block nfsd4_cld_block; #endif /* __NFSD_NETNS_H__ */ diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index cec62ed2a064..6f13281635ba 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -982,3 +983,46 @@ nfsd4_record_grace_done(struct net *net, time_t boot_time) if (client_tracking_ops) client_tracking_ops->grace_done(net, boot_time); } + +static int +rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) +{ + struct super_block *sb = ptr; + struct net *net = sb->s_fs_info; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct cld_net *cn = nn->cld_net; + struct dentry *dentry; + int ret = 0; + + if (!try_module_get(THIS_MODULE)) + return 0; + + if (!cn) { + module_put(THIS_MODULE); + return 0; + } + + switch (event) { + case RPC_PIPEFS_MOUNT: + dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + break; + } + cn->cn_pipe->dentry = dentry; + break; + case RPC_PIPEFS_UMOUNT: + if (cn->cn_pipe->dentry) + nfsd4_cld_unregister_sb(cn->cn_pipe); + break; + default: + ret = -ENOTSUPP; + break; + } + module_put(THIS_MODULE); + return ret; +} + +struct notifier_block nfsd4_cld_block = { + .notifier_call = rpc_pipefs_event, +}; diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 141197e04703..dee6c1bb9ba8 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include "idmap.h" @@ -1136,9 +1137,12 @@ static int __init init_nfsd(void) int retval; printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); + retval = rpc_pipefs_notifier_register(&nfsd4_cld_block); + if (retval) + return retval; retval = register_pernet_subsys(&nfsd_net_ops); if (retval < 0) - return retval; + goto out_unregister_notifier; retval = nfsd4_init_slabs(); if (retval) goto out_unregister_pernet; @@ -1181,6 +1185,8 @@ out_free_slabs: nfsd4_free_slabs(); out_unregister_pernet: unregister_pernet_subsys(&nfsd_net_ops); +out_unregister_notifier: + rpc_pipefs_notifier_unregister(&nfsd4_cld_block); return retval; } @@ -1197,6 +1203,7 @@ static void __exit exit_nfsd(void) nfsd_fault_inject_cleanup(); unregister_filesystem(&nfsd_fs_type); unregister_pernet_subsys(&nfsd_net_ops); + rpc_pipefs_notifier_unregister(&nfsd4_cld_block); } MODULE_AUTHOR("Olaf Kirch "); -- cgit v1.2.3 From 797a9d797f8483bb67f265c761b76dcd5a077a23 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Thu, 29 Mar 2012 07:52:49 -0400 Subject: nfsd: only register cld pipe notifier when CONFIG_NFSD_V4 is enabled Otherwise, we get a warning or error similar to this when building with CONFIG_NFSD_V4 disabled: ERROR: "nfsd4_cld_block" [fs/nfsd/nfsd.ko] undefined! Fix this by wrapping the calls to rpc_pipefs_notifier_register and ..._unregister in another function and providing no-op replacements when CONFIG_NFSD_V4 is disabled. Reported-by: Paul Gortmaker Signed-off-by: Jeff Layton Signed-off-by: J. Bruce Fields --- fs/nfsd/netns.h | 1 - fs/nfsd/nfs4recover.c | 12 ++++++++++++ fs/nfsd/nfsctl.c | 6 +++--- fs/nfsd/nfsd.h | 7 ++++++- 4 files changed, 21 insertions(+), 5 deletions(-) (limited to 'fs/nfsd/nfsctl.c') diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index 66eac332bf8d..12e0cff435b4 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -31,5 +31,4 @@ struct nfsd_net { }; extern int nfsd_net_id; -extern struct notifier_block nfsd4_cld_block; #endif /* __NFSD_NETNS_H__ */ diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index eaaf9482c7f5..4767429264a2 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -1032,3 +1032,15 @@ rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) struct notifier_block nfsd4_cld_block = { .notifier_call = rpc_pipefs_event, }; + +int +register_cld_notifier(void) +{ + return rpc_pipefs_notifier_register(&nfsd4_cld_block); +} + +void +unregister_cld_notifier(void) +{ + rpc_pipefs_notifier_unregister(&nfsd4_cld_block); +} diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index dee6c1bb9ba8..2c53be6d3579 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1137,7 +1137,7 @@ static int __init init_nfsd(void) int retval; printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); - retval = rpc_pipefs_notifier_register(&nfsd4_cld_block); + retval = register_cld_notifier(); if (retval) return retval; retval = register_pernet_subsys(&nfsd_net_ops); @@ -1186,7 +1186,7 @@ out_free_slabs: out_unregister_pernet: unregister_pernet_subsys(&nfsd_net_ops); out_unregister_notifier: - rpc_pipefs_notifier_unregister(&nfsd4_cld_block); + unregister_cld_notifier(); return retval; } @@ -1203,7 +1203,7 @@ static void __exit exit_nfsd(void) nfsd_fault_inject_cleanup(); unregister_filesystem(&nfsd_fs_type); unregister_pernet_subsys(&nfsd_net_ops); - rpc_pipefs_notifier_unregister(&nfsd4_cld_block); + unregister_cld_notifier(); } MODULE_AUTHOR("Olaf Kirch "); diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index 1d1e8589b4ce..1671429ffa66 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -364,12 +364,17 @@ static inline u32 nfsd_suppattrs2(u32 minorversion) NFSD_WRITEABLE_ATTRS_WORD2 extern int nfsd4_is_junction(struct dentry *dentry); -#else +extern int register_cld_notifier(void); +extern void unregister_cld_notifier(void); +#else /* CONFIG_NFSD_V4 */ static inline int nfsd4_is_junction(struct dentry *dentry) { return 0; } +#define register_cld_notifier() 0 +#define unregister_cld_notifier() do { } while(0) + #endif /* CONFIG_NFSD_V4 */ #endif /* LINUX_NFSD_NFSD_H */ -- cgit v1.2.3