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NFS: Allow walking nfs_client.cl_superblocks list outside client.c

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We're about to move some fields from struct nfs_client to struct
nfs_server.  There is a many-to-one relationship between nfs_servers
and nfs_clients.  After these fields are moved to the nfs_server
struct, to visit all of the data in these fields that is owned by one
nfs_client, code will need to visit each nfs_server on the
cl_superblocks list for that nfs_client.

To serialize changes to the cl_superblocks list during these little
expeditions, protect the list with RCU.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2010-12-24 01:32:32 +00:00
committed by Trond Myklebust
parent f7e8917a67
commit fca5238ef3
2 changed files with 32 additions and 21 deletions
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9
fs/nfs/nfs4renewd.c
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@ -63,9 +63,14 @@ nfs4_renew_state(struct work_struct *work)
ops = clp->cl_mvops->state_renewal_ops;
dprintk("%s: start\n", __func__);
/* Are there any active superblocks? */
if (list_empty(&clp->cl_superblocks))
rcu_read_lock();
if (list_empty(&clp->cl_superblocks)) {
rcu_read_unlock();
goto out;
}
rcu_read_unlock();
spin_lock(&clp->cl_lock);
lease = clp->cl_lease_time;
last = clp->cl_last_renewal;