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authorJeff Layton <jlayton@redhat.com>2012-03-21 09:52:08 -0400
committerJ. Bruce Fields <bfields@redhat.com>2012-03-26 11:49:48 -0400
commit813fd320c16691eac508fe350b4ee7362c6c4a56 (patch)
tree3ec14685fb13b2f5fba6ed1ce78e5e6bdb7c173e /fs/nfsd
parentf3f8014862d813cca81a597c83bd1dbf0fb2b8f6 (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.h1
-rw-r--r--fs/nfsd/nfs4recover.c44
-rw-r--r--fs/nfsd/nfsctl.c9
3 files changed, 53 insertions, 1 deletions
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 12e0cff435b..66eac332bf8 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 cec62ed2a06..6f13281635b 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 141197e0470..dee6c1bb9ba 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>");