diff options
| author | Jeff Layton | 2012-03-21 09:52:08 -0400 |
|---|---|---|
| committer | J. Bruce Fields | 2012-03-26 11:49:48 -0400 |
| commit | 813fd320c16691eac508fe350b4ee7362c6c4a56 (patch) | |
| tree | 3ec14685fb13b2f5fba6ed1ce78e5e6bdb7c173e /fs/nfsd | |
| parent | f3f8014862d813cca81a597c83bd1dbf0fb2b8f6 (diff) | |
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 <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/netns.h | 1 | ||||
| -rw-r--r-- | fs/nfsd/nfs4recover.c | 44 | ||||
| -rw-r--r-- | fs/nfsd/nfsctl.c | 9 |
3 files changed, 53 insertions, 1 deletions
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 <linux/crypto.h> #include <linux/sched.h> #include <linux/fs.h> +#include <linux/module.h> #include <net/net_namespace.h> #include <linux/sunrpc/rpc_pipe_fs.h> #include <linux/sunrpc/clnt.h> @@ -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 <linux/sunrpc/clnt.h> #include <linux/sunrpc/gss_api.h> #include <linux/sunrpc/gss_krb5_enctypes.h> +#include <linux/sunrpc/rpc_pipe_fs.h> #include <linux/module.h> #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 <okir@monad.swb.de>"); |