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| author |   Chuck Lever <chuck.lever@oracle.com> | 2010-12-24 01:32:32 +0000 |
|---|---|---|
| committer |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 14:47:56 -0500 |
| commit | fca5238ef3232cd0cf4bf0457e751b3bb20912a9 (patch) | |
| tree | 5b61da0d71e3e89b835d46a49e0f4945b5002cea /fs/nfs/nfs4renewd.c | |
| parent | pnfs: layout roc code (diff) | |
| download | linux-dev-fca5238ef3232cd0cf4bf0457e751b3bb20912a9.tar.xz linux-dev-fca5238ef3232cd0cf4bf0457e751b3bb20912a9.zip | |
NFS: Allow walking nfs_client.cl_superblocks list outside client.c
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>
Diffstat (limited to 'fs/nfs/nfs4renewd.c')
| -rw-r--r-- | fs/nfs/nfs4renewd.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c index 72b6c580af13..cde5650ee5a2 100644 --- a/fs/nfs/nfs4renewd.c +++ b/fs/nfs/nfs4renewd.c @@ -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; |