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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-06 23:12:04 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-11 07:40:41 +0400
commit8383e4602c89857ef926f29ca61ac0a83a614443 (patch)
treec60d44dbbfccfa6976d61fb7b10f9f97cc6cda06 /fs/nfs/delegation.h
parent13437e12fb43cb7e285ff59248f781c91578eafe (diff)
downloadlinux-8383e4602c89857ef926f29ca61ac0a83a614443.tar.xz
NFSv4: Use RCU to protect delegations
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/delegation.h')
-rw-r--r--fs/nfs/delegation.h14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index 8f79a3135167..5874ce7fdbae 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -22,6 +22,7 @@ struct nfs_delegation {
long flags;
loff_t maxsize;
__u64 change_attr;
+ struct rcu_head rcu;
};
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
@@ -45,11 +46,16 @@ int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
static inline int nfs_have_delegation(struct inode *inode, int flags)
{
+ struct nfs_delegation *delegation;
+ int ret = 0;
+
flags &= FMODE_READ|FMODE_WRITE;
- smp_rmb();
- if ((NFS_I(inode)->delegation_state & flags) == flags)
- return 1;
- return 0;
+ rcu_read_lock();
+ delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation != NULL && (delegation->type & flags) == flags)
+ ret = 1;
+ rcu_read_unlock();
+ return ret;
}
#else