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[RFC PATCH 2/5] SUNRPC: send notification events on pipefs sb creation and destruction [message #43800] Mon, 17 October 2011 12:12
Stanislav Kinsbursky is currently offline  Stanislav Kinsbursky
Messages: 683
Registered: October 2011
Senior Member
From: *parallels.com
It will be used to notify subscribers about pipefs superblock creation and
destruction.
Cubcriders have to create their dentries on passed superblock on mount event
and destroy otherwise.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

---
include/linux/sunrpc/rpc_pipe_fs.h | 8 ++++++++
net/sunrpc/rpc_pipe.c | 27 +++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index cf14db9..c1cdb2f 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -44,6 +44,14 @@ RPC_I(struct inode *inode)
return container_of(inode, struct rpc_inode, vfs_inode);
}

+extern int rpc_pipefs_notifier_register(struct notifier_block *);
+extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
+
+enum {
+ RPC_PIPEFS_MOUNT,
+ RPC_PIPEFS_UMOUNT,
+};
+
extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);

struct rpc_clnt;
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 8322080..c90a7e0 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -28,6 +28,7 @@
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/sunrpc/cache.h>
#include <linux/nsproxy.h>
+#include <linux/notifier.h>

#include "netns.h"

@@ -41,6 +42,18 @@ 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_notifi er_list, nb);
+}
+
+void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&rpc_pipefs_notifier_ list, nb);
+}
+
static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
void (*destroy_msg)(struct rpc_pipe_msg *), int err)
{
@@ -1010,6 +1023,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode;
struct dentry *root;
struct net *net = current->nsproxy->net_ns;
+ int err;

sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -1027,8 +1041,18 @@ 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:
+ /* TODO: check if we need to send RPC_PIPEFS_UMOUNT notification. */
+ __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
+ return err;
}

static struct dentry *
@@ -1043,6 +1067,9 @@ 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);
}
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