From 2d00131acc641b2cb6f0bdefb8c7bdd8fdf7410b Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Mon, 26 Dec 2011 15:39:13 +0300 Subject: SUNRPC: send notification events on pipefs sb creation and destruction They will be used to notify subscribers about pipefs superblock creation and destruction. Subcribers will have to create their dentries on passed superblock on mount event and destroy otherwise. Signed-off-by: Stanislav Kinsbursky Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'net/sunrpc/rpc_pipe.c') diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index f628b0f48a87..58a5062df260 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -28,8 +28,10 @@ #include #include #include +#include #include "netns.h" +#include "sunrpc.h" static struct vfsmount *rpc_mnt __read_mostly; static int rpc_mount_count; @@ -41,6 +43,20 @@ static struct kmem_cache *rpc_inode_cachep __read_mostly; #define RPC_UPCALL_TIMEOUT (30*HZ) +static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); + +int rpc_pipefs_notifier_register(struct notifier_block *nb) +{ + return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); + +void rpc_pipefs_notifier_unregister(struct notifier_block *nb) +{ + blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); + static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, void (*destroy_msg)(struct rpc_pipe_msg *), int err) { @@ -997,6 +1013,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent) struct inode *inode; struct dentry *root; struct net *net = data; + int err; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; @@ -1014,8 +1031,20 @@ rpc_fill_super(struct super_block *sb, void *data, int silent) } if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) return -ENOMEM; + err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, + RPC_PIPEFS_MOUNT, + sb); + if (err) + goto err_depopulate; sb->s_fs_info = get_net(net); return 0; + +err_depopulate: + blocking_notifier_call_chain(&rpc_pipefs_notifier_list, + RPC_PIPEFS_UMOUNT, + sb); + __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); + return err; } static struct dentry * @@ -1030,6 +1059,9 @@ void rpc_kill_sb(struct super_block *sb) struct net *net = sb->s_fs_info; put_net(net); + blocking_notifier_call_chain(&rpc_pipefs_notifier_list, + RPC_PIPEFS_UMOUNT, + sb); kill_litter_super(sb); } -- cgit v1.2.3-70-g09d2