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NFSv4: Use RCU to protect delegations

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2007-07-06 15:12:04 -04:00
parent 13437e12fb
commit 8383e4602c
2 changed files with 73 additions and 55 deletions
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14
fs/nfs/delegation.h
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@ -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