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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-01-10 13:13:19 +0100
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-01 00:20:27 +0100
commiteee17325f1dfbe004f1475743bab9e3d050d00f5 (patch)
treeca48905e04e88658cff7d1a745a12ac3c04cfd77 /net/sunrpc
parentNFS: handle NFS idmap pipe PipeFS dentries by network namespace aware routines (diff)
downloadlinux-eee17325f1dfbe004f1475743bab9e3d050d00f5.tar.xz
linux-eee17325f1dfbe004f1475743bab9e3d050d00f5.zip
NFS: idmap PipeFS notifier introduced
v2: 1) Added "nfs_idmap_init" and "nfs_idmap_quit" definitions for kernels built without CONFIG_NFS_V4 option set. This patch subscribes NFS clients to RPC pipefs notifications. Idmap notifier is registering on NFS module load. This notifier callback is responsible for creation/destruction of PipeFS idmap pipe dentry for NFS4 clients. Since ipdmap pipe is created in rpc client pipefs directory, we have make sure, that this directory has been created already. IOW RPC client notifier callback has been called already. To achive this, PipeFS notifier priorities has been introduced (RPC clients notifier priority is greater than NFS idmap one). But this approach gives another problem: unlink for RPC client directory will be called before NFS idmap pipe unlink on UMOUNT event and will fail, because directory is not empty. The solution, introduced in this patch, is to try to remove client directory once again after idmap pipe was unlinked. This looks like ugly hack, so probably it should be replaced in some more elegant way. Note that no locking required in notifier callback because PipeFS superblock pointer is passed as an argument from it's creation or destruction routine and thus we can be sure about it's validity. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c1
-rw-r--r--net/sunrpc/rpc_pipe.c16
2 files changed, 17 insertions, 0 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index ed7c22de9319..4c6848017168 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -222,6 +222,7 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
static struct notifier_block rpc_clients_block = {
.notifier_call = rpc_pipefs_event,
+ .priority = SUNRPC_PIPEFS_RPC_PRIO,
};
int rpc_clients_notifier_register(void)
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 6b417fcabdbf..bae4e71d8663 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -616,6 +616,22 @@ static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
return ret;
}
+int rpc_rmdir(struct dentry *dentry)
+{
+ struct dentry *parent;
+ struct inode *dir;
+ int error;
+
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+ error = __rpc_rmdir(dir, dentry);
+ mutex_unlock(&dir->i_mutex);
+ dput(parent);
+ return error;
+}
+EXPORT_SYMBOL_GPL(rpc_rmdir);
+
static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
{
int ret;