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Subject[PATCH v2 2/4] NFS: release per-net clients lock before calling PipeFS dentries creation
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Lockdep is sad otherwise, because inode mutex is taken on PipeFS dentry
creation, which can be called on mount notification, where this per-net client
lock is taken on clients list walk.

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

---
fs/nfs/client.c | 2 +-
fs/nfs/idmap.c | 8 ++++++--
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 8563585..6aeb6b3 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -538,7 +538,7 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
/* install a new client and return with it unready */
install_client:
clp = new;
- list_add(&clp->cl_share_link, &nn->nfs_client_list);
+ list_add_tail(&clp->cl_share_link, &nn->nfs_client_list);
spin_unlock(&nn->nfs_client_lock);

error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index b5c6d8e..8a9e7a4 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -558,16 +558,20 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
{
struct super_block *sb = ptr;
struct nfs_net *nn = net_generic(sb->s_fs_info, nfs_net_id);
- struct nfs_client *clp;
+ struct nfs_client *clp, *tmp;
int error = 0;

spin_lock(&nn->nfs_client_lock);
- list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
+ list_for_each_entry_safe(clp, tmp, &nn->nfs_client_list, cl_share_link) {
if (clp->rpc_ops != &nfs_v4_clientops)
continue;
+ atomic_inc(&clp->cl_count);
+ spin_unlock(&nn->nfs_client_lock);
error = __rpc_pipefs_event(clp, event, sb);
+ nfs_put_client(clp);
if (error)
break;
+ spin_lock(&nn->nfs_client_lock);
}
spin_unlock(&nn->nfs_client_lock);
return error;


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